US20070044980A1 - System for controlling an earthworking implement - Google Patents
System for controlling an earthworking implement Download PDFInfo
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- US20070044980A1 US20070044980A1 US11/214,993 US21499305A US2007044980A1 US 20070044980 A1 US20070044980 A1 US 20070044980A1 US 21499305 A US21499305 A US 21499305A US 2007044980 A1 US2007044980 A1 US 2007044980A1
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- Prior art keywords
- depth
- cut
- earthworking
- earthworking implement
- implement
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/76—Graders, bulldozers, or the like with scraper plates or ploughshare-like elements; Levelling scarifying devices
- E02F3/80—Component parts
- E02F3/84—Drives or control devices therefor, e.g. hydraulic drive systems
- E02F3/844—Drives or control devices therefor, e.g. hydraulic drive systems for positioning the blade, e.g. hydraulically
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/76—Graders, bulldozers, or the like with scraper plates or ploughshare-like elements; Levelling scarifying devices
- E02F3/7609—Scraper blade mounted forwardly of the tractor on a pair of pivoting arms which are linked to the sides of the tractor, e.g. bulldozers
- E02F3/7618—Scraper blade mounted forwardly of the tractor on a pair of pivoting arms which are linked to the sides of the tractor, e.g. bulldozers with the scraper blade adjustable relative to the pivoting arms about a horizontal axis
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/2025—Particular purposes of control systems not otherwise provided for
- E02F9/2029—Controlling the position of implements in function of its load, e.g. modifying the attitude of implements in accordance to vehicle speed
Definitions
- the present disclosure relates generally to a method and apparatus for controlling an earthworking implement, and more particularly, to a method and apparatus for controlling an earthworking implement with respect to a working depth of cut.
- Earthworking machines such as, for example, dozers, loaders, excavators, motor graders, and other types of earth moving machines, are often used to remove material from a work site to achieve a desired work site grade. Specifically, it may be desired to remove a layer of a first material to expose a second material located beneath the first layer. For example, it may be desired to remove a layer of dirt and/or rock to expose a valuable layer of coal or other ore. Additionally, it may be desired to remove a layer of material to achieve a desired grade to prepare a work site for further construction. For example, it may be desired to remove a layer of dirt and/or rock to establish a desired grade for a parking lot or road.
- the system of the '190 patent may automatically control the depth of cut of an earthworking implement
- the earthworking implement may be undesirably controlled because the system of the '190 patent may not account for depth of cut differences between a desired contour of the work site and the capability of the earthworking machine to remove material from the work site.
- the earthworking implement of the '190 patent may be controlled to remove material desired to remain in the work site, thus wasting valuable material and/or requiring material to be replaced to achieve a desired grade.
- the earthworking implement of the '190 patent may be controlled to remove less material than desired from the work site, thus wasting earthworking implement productivity.
- the disclosed method and apparatus for controlling an earthworking implement is directed to overcoming one or more of the problems set forth above.
- the present disclosure is directed to a method for controlling an earthworking implement of an earthworking machine.
- the method includes determining a first depth of cut of the earthworking implement at least partially based on a power capability of the earthworking implement.
- the method also includes determining a second depth of cut of the earthworking implement at least partially based on a desired grade of a work site.
- the method further includes moving the earthworking implement in response to at least one of the first depth of cut and the second depth of cut.
- the present disclosure is directed to a method of moving an earthworking implement of an earthworking machine which includes moving the earthworking implement toward a first depth of cut.
- the first depth of cut being at least partially based on a desired grade.
- the method also includes automatically moving the earthworking implement toward a second depth of cut.
- the second depth of cut being different than the first depth of cut and the second depth of cut being at least partially based on a power capability of the earthworking implement.
- FIG. 1 is a pictorial illustration of a exemplary disclosed earthworking machine
- FIG. 2 is a schematic illustration of a control system of the disclosed earthworking machine of FIG. 1 ;
- FIG. 3 is an exemplary block diagram of a method of the disclosed control system of FIG. 2 .
- FIG. 1 illustrates an exemplary earthworking machine 12 .
- Earthworking machine 12 may be a mobile machine that performs some type of operation associated with an industry such as mining, construction, farming, or other industry known in the art.
- earthworking machine 12 may be a dozer, a loader, a backhoe, an excavator, a motor grader, or any other earthworking machine known in the art.
- Earthworking machine 12 may be configured to traverse a work site 10 to remove material 100 from and/or add material 100 to locations within work site 10 .
- Earthworking machine 12 may include a frame 14 , an earthworking implement 16 , and a control system 18 .
- Frame 14 may include any structural unit that supports movement of earthworking machine 12 .
- Frame 14 may be, for example, a stationary base frame connecting a power source (not shown) to a traction device 24 , a movable frame member of a linkage system, or any other type of frame known in the art.
- traction device 24 may include tracks, wheels, and/or other traction devices known in the art.
- Earthworking implement 16 may include a device used in the performance of material handling.
- earthworking implement 16 may include a blade, a scraper, a bucket, a shovel, and/or other types of earthworking implements known in the art.
- Earthworking implement 16 may be coupled to frame 14 via a hydraulic cylinder 20 and a linkage system 22 and may be selectively movable relative to frame 14 by hydraulic cylinder 20 . Additionally, earthworking implement 16 may be moved relative to a surface 102 of material 100 to remove material 100 from work site 10 .
- Earthworking implement 16 may be configured to pivot, rotate, slide, swing, or otherwise move relative to frame 14 in any manner known in the art. It is contemplated that earthworking implement 16 may include multiple earthworking implements.
- control system 18 may be configured to control the operation of earthworking machine 12 and, in particular, configured to control earthworking implement 16 .
- Control system 18 may include a command controller 400 , a productive controller 402 , and a contour controller 404 , and may be configured to interact with hydraulic cylinder 20 to control the extension and/or retraction thereof to affect movement of earthworking implement 16 .
- Control system 18 may also be configured to interact with auxiliary devices 50 such as, for example, a power source, a steering apparatus, drive train apparatus, and/or other devices used to operate earthworking machine 12 and/or components thereof to selectively and/or dynamically affect movement thereof over work site 10 .
- control system 18 may additionally include other components, such as, for example, operator interfaces, visual displays, warning indicators, sensors, and/or other components known in the art to display, affect, and/or control the operation of earthworking machine 12 and/or components thereof. It is also contemplated that control system 18 may include command controller 400 , productive controller 402 , and contour controller 404 embodied as a single controller, two controllers, and/or any number of controllers, as desired.
- Productive controller 402 may be configured to determine a productive depth of cut of earthworking implement 16 relative to surface 102 to maximize the productive removal of material 100 from work site 10 .
- the productive depth of cut may be based in part on the power capability of earthworking implement 16 , which may be based in part on the ability of earthworking implement 16 to productively remove material 100 from work site 10 .
- Productive controller may be further configured to output a command signal D P , indicative of the determined productive depth of cut, to command controller 400 to affect the movement of earthworking implement 16 in response to the determined productive depth of cut.
- productive controller 402 determines that earthworking implement 16 is operating at a depth of cut shallower than an optimal productivity, e.g., earthworking implement 16 may be unproductively removing too small an amount of material 100 , productive controller 402 may be configured to output command signal D P to command controller 400 which would lower earthworking implement 16 deeper into material 100 .
- productive controller 402 determines that earthworking implement 16 is operating at a depth of cut deeper than an optimal predetermined productivity, e.g., earthworking implement 16 may be unproductively removing too great an amount of material 100
- productive controller 402 may be configured to output command signal D P to command controller 400 which would raise earthworking implement 16 higher within material 100 .
- productive controller 402 may output, to command controller 400 , command signal D P adapted to control the depth of cut of earthworking implement 16 within material 100 to achieve a productive removal thereof. It is contemplated that productive controller 402 may dynamically output command signal D P to command controller 400 in response to varying work site conditions and/or other conditions that may affect command signal D P , such as, for example, operational capabilities of earthworking machine 12 and/or material properties of material 100 .
- productive controller 402 may determine the productive depth of cut and output command signal D P through a predetermined algorithm as a function of signals received from a ground speed sensor (not shown), a slope detector (not shown), a slip detector (not shown), and/or a tilt sensor (not shown).
- the power of earthworking implement 16 may be determined and/or based in part on the sensed ground speed of earthworking machine 12 , the detected slope of work site 10 , the detected slip of traction device 24 , the sensed tilt of earthworking implement 16 , and/or the relationships thereof with the amount of material 100 being removed by earthworking implement 16 .
- Productive controller 402 may be configured to determine the productive depth of cut based in part on the power of earthworking implement 16 determined by the predetermined algorithm analyzing the sensed data and/or comparing such data with look-up tables, databases, and/or other known mathematical manipulations. Additionally, productive controller 402 may be configured to determine the actual depth of cut of earthworking implement 16 in part based on the position of earthworking implement 16 relative to earthworking machine 12 and/or surface 102 and compare the determined productive depth of cut and the actual depth of cut to output command signal D P to affect movement of earthworking implement 16 toward the productive depth of cut. It is contemplated that productive controller 402 , through the predetermined algorithm, may also determine command signal D P based in part on error feedback terms and mathematical constants as is known in the art.
- Productive controller 402 may embody any known or conventional apparatus and method configured to maximize the productive removal of material from a work site. It is further contemplated that productive controller 402 may include any controller, method, and/or algorithm configured to determine a depth of cut based on the power capability of an earthworking implement by analyzing, sensing, and/or monitoring known operational parameters of the earthworking implement, an earthworking machine, and/or work site properties.
- Contour controller 404 may be configured to determine a contour depth of cut of earthworking implement 16 relative to surface 102 to remove material 100 from worksite 10 to achieve a desired grade. Contour controller 404 may be further configured to output a command signal D C , indicative of the determined contour depth of cut, to command controller 400 to affect the position of earthworking implement 16 in response to the determined contour position. For example, if contour controller 404 determines that earthworking implement 16 is operating at a depth of cut above a predetermined desired grade, i.e., earthworking implement 16 is not removing material that is desired to be removed, contour controller 404 may be configured to output command signal D C which would command controller 400 to lower earthworking implement 16 deeper into material 100 .
- contour controller 404 may be configured to output command signal D C which would command controller 400 to raise earthworking implement 16 higher within material 100 .
- contour controller 404 may output, to command controller 400 , command signal D C adapted to control the depth of cut of earthworking implement 16 within material 100 to achieve a desired grade.
- contour controller 404 may additionally include command outputs to control and/or operate warning signals, alarms, visual displays, and/or other informational components that may be activated to indicate an operating status of contour controller 404 and, in particular, earthworking implement 16 and earthworking machine 12 . It is contemplated that contour controller 404 may dynamically output command signal D C to command controller 400 in response to varying work site conditions and/or other conditions that may affect command signal D C , such as, for example, varying depth of desired contour and/or varying contour of surface 102 .
- contour controller 404 may determine the contour depth of cut through a predetermined algorithm based in part on work site geographies and may include a desired work site geography model and an actual work site geography model.
- Contour controller may be configured to receive an initial work site geography determined, for example, by manual site survey, automated site survey systems utilizing stereo photography and data processors, and/or geological core sampling methods.
- the initial work site geography model may be stored within a data storage device (not shown) and configured to be accessible by a global positioning system (“GPS”) via the algorithm.
- GPS global positioning system
- the GPS may be further configured to monitor position coordinates of earthworking machine 12 relative to work site 10 and communicate data to the algorithm, which in turn may determine the actual work site geography as changes are made thereto by earthworking implement 16 .
- Contour controller 404 may also be configured to determine the position of earthworking implement 16 relative to earthworking machine 12 .
- Contour controller 404 may be further configured to output command signal D C based on the difference between the actual and desired work site geography models to control earthworking implement 16 and/or earthworking machine 12 to remove material 100 and bring the actual work site into conformity with the desired work site geography model.
- contour controller 404 may include any controller, method, and/or algorithm configured to determine a depth of cut of an earthworking implement based in part on a desired grade of a work site by analyzing, sensing, and/or monitoring known operational parameters and/or locations of the earthworking implement, an earthworking machine, and/or work site properties.
- Command controller 400 may be configured to monitor and regulate command signals D P and D C outputted from productive controller 402 and contour controller 404 , respectively, to thereby control movement of earthworking implement 16 .
- Command controller 400 may receive command signals D P and D C and may determine which of command signals D P or D C would control earthworking implement to operate at a higher depth of cut within material 100 .
- Command controller 400 may further be configured to output a command signal D I indicative of one of command signals D P and D C determined to control earthworking implement 16 to a higher depth of cut.
- Command controller 400 may further be configured to output command signal D I to affect movement of hydraulic cylinder 20 , via a hydraulic circuit (not shown), to control earthworking implement 16 to a working depth of cut.
- command controller 400 may be configured to override the other one of command signals D P and D C not determined to control earthworking implement 16 to a higher depth of cut. It is contemplated that command controller may allow the one of command signals determined to control earthworking implement 16 to a higher depth of cut to directly control hydraulic cylinder 20 to the working depth of cut. It is also contemplated that command controller 400 may alternatively control other components of earthworking machine 12 to affect the movement of earthworking implement 16 to the working depth of cut, such as, for example, hydraulic valve actuators, direct electronic actuators, mechanically geared actuators, and/or other components known in the art. It is also contemplated that command controller 400 , productive controller 402 , and contour controller 404 may be integrated into a common controller. It is further contemplated that command controller 400 may additionally affect and/or control operation and movement of earthworking machine 12 over work site 10 .
- FIG. 3 illustrates an exemplary method 500 of command controller 400 to control movement of earthworking implement 16 .
- Method 500 may include a comparing command signal D P and command signal D C , step 502 , outputting a command signal D I indicative of command signal D C , step 504 , and outputting a command signal D I indicative of command signal D P .
- method 500 may compare command signals D P and D C in step 502 and determine if command signal Dc corresponds to a higher depth of cut than command signal D P . If command signal D C corresponds to a higher depth of cut, method 500 may progress to step 504 wherein command controller may output command signal D I indicative of command signal D C . If command signal D C does not correspond to a higher depth of cut, method 500 may progress to step 506 wherein command controller may output command signal D I indicative of command signal D P .
- Step 502 may compare command signals D P and D C and determine if command signal D C would affect movement of earthworking implement 16 to a higher depth of cut than command signal D P .
- the comparison of command signals D P and D C and the determination of whether command signal D C would control earthworking implement 16 to a higher depth of cut than would command signal D P may be determined by an algorithm and may be based in part on look-up tables, calculations, and/or other mathematically suitable methods known in the art to compare signals.
- Step 504 may include command controller 400 outputting command signal D I configured to affect control of earthworking implement 16 to a depth of cut indicative of command signal D C .
- command signal D I may be in part based on command signal D C and may control the movement of earthworking implement 16 via hydraulic cylinder 20 .
- command controller 400 may prohibit command signal D P from affecting movement of earthworking implement 16 .
- command controller 400 may selectively suspend productive controller 402 from outputting command signal D P .
- command controller 400 may selectively suspend command signal D P from affecting movement of earthworking implement 16 .
- Command controller 400 may selectively suspend command signal D P by an integrated circuit logic, an algorithm and/or other control means known in the art. It is contemplated that command controller 400 may also selectively suspend calculation of any error feedback terms. Specifically, command controller 400 may override the calculation of the error feedback term by fixing the term to zero by an integrated circuit logic, an algorithm and/or other control means known in the art. Selectively overriding the calculation of any error feedback terms may eliminate productive controller 402 from outputting command signal D P which would affect a large actuation of earthworking implement 16 when command controller 400 outputs command signal D I indicative of command signal D P subsequent to outputting command signal D I indicative of command signal D C .
- Step 506 may include command controller 400 outputting command signal D I to affect control of earthworking implement 16 to a depth of cut indicative of command signal D P when command signal D C is not higher than command signal D P .
- command signal D I may be based in part on command signal D P and may control the movement of earthworking implement 16 via hydraulic cylinder 20 .
- command controller 400 may prohibit command signal D C from affecting movement of earthworking implement 16 .
- command controller 400 may selectively suspend contour controller 404 from outputting command signal Dc and other command signals which would control earthworking machine 12 and/or earthworking implement 16 , and also control additional instructional and/or warning signals indicative of the operating status of contour controller 404 and earthworking machine 12 .
- command controller 400 may selectively suspend command signal D C .
- Command controller 400 may selectively suspend command signal D C by an integrated circuit logic, an algorithm and/or other control means known in the art. It is contemplated that command controller 400 may also selectively suspend additional instructional and/or warning signals indicative of the operating status of contour controller 404 and earthworking machine 12 by an integrated circuit logic, an algorithm and/or other control means known in the art.
- Method 500 may additionally be configured to return to control 502 after steps 504 , 506 . Specifically, subsequent to command controller outputting command signal D I indicative of command signal D C or D P , command controller may monitor and again compare command signals D C and D P . After a subsequent determination in step 502 regarding command signals D C and D P , method 500 may progress to step 504 or step 506 and method 500 may be repeated as necessary or desired by an operator to remove material 100 from work site 10 . As such, method 500 may continuously monitor and compare command signals D C and D P and command controller 400 may dynamically output command signal D I indicative of the one of command signals D C and D P that would control earthworking implement to a higher depth of cut. It is contemplated that method 500 may further include additional steps such as, for example, an initialization step (not shown), an end step (not shown), a suspend/pause step (not shown), or other control features known in the art.
- the disclosed method and apparatus of controlling an earthworking implement may be applicable to any earthworking machine that removes material from a work site.
- the disclosed method and apparatus may provide productive material removal while bringing actual work site geography into desired work site geography.
- the operation of the method and apparatus of controlling earthworking implement 16 is explained below.
- Earthworking machine 12 may be used to remove material 100 from work site 10 to achieve a desired grade. Specifically, earthworking machine 12 may traverse work site 10 to remove material 100 to expose a layer of desired material and/or provide a desired contour. As earthworking machine 12 traverses work site 10 , earthworking implement 16 may be raised and/or lowered relative to surface 102 of material 100 to affect the removal of material 100 from work site 10 . As earthworking implement 16 affects removal of material 100 , control system 18 may monitor and control the position of earthworking machine 12 relative to work site 10 and the position of earthworking implement 16 relative to earthworking machine 12 to productively remove material 100 while achieving a desired grade.
- productive controller 402 may output control signal D P to command controller 400 that would control earthworking implement 16 to be moved relative to surface 102 .
- productive controller 402 may determine that earthworking implement, and earthworking machine 12 , may be capable of removing more material 100 than that currently being removed and/or may be currently be removing too much material 100 .
- contour controller 404 may output command signal D C to command controller 400 that would control earthworking implement 16 to be moved relative to surface 102 .
- contour controller 404 may determine that surface 102 of material 100 is not the desired grade and thus that material 100 needs to be removed and/or that surface 102 is the desired grade and that no material 100 needs to be removed.
- Command controller 400 may compare (referring to FIG. 3 ) command signals D P and D C to determine which of command signals D P and D C is configured to control earthworking implement 16 to a higher depth of cut below surface 102 . Command controller 400 may then output command signal D I , indicative of the one of productive controller 402 and contour controller 404 that would control earthworking implement 16 to a higher depth of cut to thereby control earthworking implement 16 . For example, if command controller 400 determines that command signal D C would control earthworking implement 16 to a higher depth of cut (i.e., productive controller 402 would control earthworking implement below the desired grade), command controller 400 may output command signal D I indicative of command signal D C to control earthworking implement 16 .
- command controller 400 may output command signal D I indicative of command signal D P to control earthworking implement 16 . It is contemplated that command controller 400 may, alternatively, allow the one of command signals D P and D C that would control earthworking implement 16 to a higher depth of cut to directly control earthworking implement 16 .
- control system 18 and in particular, command controller 400 is illustrated with reference to earthworking machine 12 during several passes across work site 10 from a unmodified work site toward a desired grade. It is noted that the explanation below is for clarification purposes only, and the method and apparatus may be applicable for any earthworking machine at any status of material removal from work site 10 .
- earthworking implement 16 may be positioned above surface 102 and may not remove material 100 . It is likely, however, that surface 102 may not be at the desired grade and both productive controller 402 and contour controller 404 may determine and output respective command signals D P and D C that would lower earthworking implement 16 below surface 102 .
- productive controller 402 may output a command signal D P to command controller 400 that would lower earthworking implement 16 to a productive depth of cut to productively remove material 100 .
- contour controller 404 may substantially simultaneously output command signal D C to command controller 400 that would lower earthworking implement 16 toward a contour depth of cut to achieve a desired grade.
- command signals D P and D C may each affect a lowering of earthworking implement 16 toward the desired grade of work site 10 .
- Command controller 400 may monitor and determine which of command signals D P and D C would control earthworking implement 16 to a higher depth of cut (see FIG. 3 , step 502 ). Because surface 102 may not be at the desired grade, command controller 400 may move earthworking implement 16 lower into material 100 below surface 102 in response to one of command signals D P or D C . It is contemplated that earthworking implement 16 may gradually be lowered into material 100 below surface 102 to begin removing material 100 due to movement of earthworking machine 12 relative to work site 10 and time necessary to move earthworking implement 16 from an preexisting depth of cut to subsequent depth of cut.
- command signal D C may control earthworking implement 16 to a higher depth of cut than would command signal D P .
- command controller 400 may determine that command signal D C would control earthworking implement 16 to a higher depth of cut than would command signal D P (see FIG. 3 , step 502 ) and may output command signal D I to control earthworking implement 16 to a depth of cut indicative of command signal D C (see FIG. 3 , step 504 ).
- earthworking machine 12 may be capable of moving a large amount of material 100 but only a relatively small amount of material needs to be removed to achieve the desired grade.
- productive controller 402 may output command signal D P that would, if allowed to control earthworking implement 16 , lower earthworking implement 16 below the desired grade, which may be undesirable.
- the amount of material 100 removed by earthworking implement 16 may increase. Specifically, newly removed material 100 may combine with previously removed material 100 and may build up in front of earthworking implement 16 . As the amount of removed material 100 increases, earthworking implement 16 may no longer be able to productively remove material 100 at the contour depth of cut and productive controller 402 may output command signal D P that would control earthworking implement 16 at a higher depth of cut than would command signal D C .
- Command controller 400 may continually monitor command signals D C and D P , and may determine that command D P would control earthworking implement 16 to a higher depth of cut than would command signal D C (see FIG. 3 , step 502 ) and may output command signal D I to control earthworking implement 16 to a depth of cut indicative of command signal D P (see FIG. 3 , step 506 ).
- earthworking implement 16 may no longer be capable of productively removing material 100 at the desired grade as controlled by contour controller 404 because of the increasing amount of material 100 removed by earthworking implement 16 .
- earthworking implement 16 may be raised to a higher depth of cut, i.e., earthworking implement 16 may no longer be controlled to the contour depth of cut and instead may be controlled to the productive depth of cut.
- contour controller 404 may monitor the desired work site geography and the actual work site geography and dynamically output command signal D C to affect earthworking implement 16 toward a contour depth of cut.
- productive controller 402 may monitor the operating conditions of earthworking machine 12 and/or earthworking implement 16 and dynamically output command signal D P to affect earthworking implement 16 toward a productive depth of cut.
- command controller 400 may monitor dynamically outputted command signals D C and D P and may thus dynamically output command signal D I to dynamically control the depth of earthworking implement 16 .
- the desired geography and/or actual geography of work site 10 may vary and command signals D C and D P may correspondingly vary depending upon the location of earthworking machine 12 relative to work site 10 and/or the amount of material desired to be removed.
- the actual and/or desired grade may include variable slopes and as a result may include a dynamically changing difference between the actual grade and the desired grade resulting in contour controller 404 and productive controller 402 dynamically determining command signals D C and D P that would control earthworking implement 16 to respective dynamic depths of cut.
- contour controller 404 affected control of earthworking implement 16 to the desired grade. Accordingly, contour controller 404 may output command signal D C that would not lower earthworking implement below surface 102 because the desired grade has been achieved. However, because earthworking implement 16 may not be removing material 100 , productive controller 402 may output command signal D P that would lower earthworking implement below surface 102 because earthworking implement 16 is capable of productively removing more material 100 . Controller 400 may monitor command signals D C and D P and output command signal D I indicative of command signal D C to control earthworking implement 16 .
- contour controller 404 and productive controller 402 may determine and output respective command signals D C and D P that would lower earthworking implement 16 below surface 102 . Again assuming a relatively small amount of material 100 is desired to be removed, controller 400 may output command signal D I indicative of command signal D C to control earthworking implement 16 toward the contour depth of cut. As earthworking machine 12 continues the second pass, and similar to the first pass, the amount of material 100 removed by earthworking implement 16 may increase and earthworking implement 16 may no longer be able to productively remove material 100 at the contour depth.
- Productive controller 402 may output command signal D P that would control earthworking implement 16 at a higher depth of cut than would command signal D C and accordingly, controller 400 may output command signal D I indicative of command signal D P to control earthworking implement 16 .
- earthworking machine 12 makes subsequent passes across work site 10 , the operation explained above may be continued as necessary to achieve the desired grade. Each subsequent pass may bring the actual work site geography closer toward the desired work site geography. It is contemplated that work machine 12 may begin subsequent passes at the point where surface 102 of material 100 is no longer at the desired grade. Specifically, earthworking machine may not need to start subsequent passes at the same origin as previous passes because the desired grade may have been achieved therein.
- command controller 400 monitors command signals D P and D C and controls earthworking implement 16 in response to the one of command signals D P and D C that would control earthworking implement to a higher depth of cut, removal of material from work site 10 may be performed productively and to a desired grade. This monitoring may eliminate the unintended removal of material desired to remain in work site 10 and may increase the productive removal of material that is desired to be removed. The overall productivity of transforming a work site from actual geography to desired geography may be increased.
Abstract
A method for controlling an earthworking implement of an earthworking machine is disclosed. The method includes determining a first depth of cut of the earthworking implement at least partially based on a power capability of the earthworking implement. The method also includes determining a second depth of cut of the earthworking implement at least partially based on a desired grade of a work site. The method further includes moving the earthworking implement in response to at least one of the first depth of cut and the second depth of cut.
Description
- The present disclosure relates generally to a method and apparatus for controlling an earthworking implement, and more particularly, to a method and apparatus for controlling an earthworking implement with respect to a working depth of cut.
- Earthworking machines such as, for example, dozers, loaders, excavators, motor graders, and other types of earth moving machines, are often used to remove material from a work site to achieve a desired work site grade. Specifically, it may be desired to remove a layer of a first material to expose a second material located beneath the first layer. For example, it may be desired to remove a layer of dirt and/or rock to expose a valuable layer of coal or other ore. Additionally, it may be desired to remove a layer of material to achieve a desired grade to prepare a work site for further construction. For example, it may be desired to remove a layer of dirt and/or rock to establish a desired grade for a parking lot or road.
- Methods have been employed to control earthworking machines and, in particular, earthworking implements during the material removal process. For example, U.S. Pat. No. 5,819,190 (“the '190 patent”) issued to Nakagami et al. discloses a control system which monitors variables of an earthworking implement and of an earthworking machine and responsively controls the earthworking implement relative to material to be removed. Specifically, the system of the '190 patent determines the operational cutting edge position of an earthworking implement with respect to the ground and controls the earthworking implement to be raised or lowered to be kept coincident with a preset target cutting edge position.
- Although the system of the '190 patent may automatically control the depth of cut of an earthworking implement, the earthworking implement may be undesirably controlled because the system of the '190 patent may not account for depth of cut differences between a desired contour of the work site and the capability of the earthworking machine to remove material from the work site. Specifically, the earthworking implement of the '190 patent may be controlled to remove material desired to remain in the work site, thus wasting valuable material and/or requiring material to be replaced to achieve a desired grade. Additionally, the earthworking implement of the '190 patent may be controlled to remove less material than desired from the work site, thus wasting earthworking implement productivity.
- The disclosed method and apparatus for controlling an earthworking implement is directed to overcoming one or more of the problems set forth above.
- In one aspect, the present disclosure is directed to a method for controlling an earthworking implement of an earthworking machine. The method includes determining a first depth of cut of the earthworking implement at least partially based on a power capability of the earthworking implement. The method also includes determining a second depth of cut of the earthworking implement at least partially based on a desired grade of a work site. The method further includes moving the earthworking implement in response to at least one of the first depth of cut and the second depth of cut.
- In another aspect, the present disclosure is directed to a method of moving an earthworking implement of an earthworking machine which includes moving the earthworking implement toward a first depth of cut. The first depth of cut being at least partially based on a desired grade. The method also includes automatically moving the earthworking implement toward a second depth of cut. The second depth of cut being different than the first depth of cut and the second depth of cut being at least partially based on a power capability of the earthworking implement.
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FIG. 1 is a pictorial illustration of a exemplary disclosed earthworking machine; -
FIG. 2 is a schematic illustration of a control system of the disclosed earthworking machine ofFIG. 1 ; and -
FIG. 3 is an exemplary block diagram of a method of the disclosed control system ofFIG. 2 . -
FIG. 1 illustrates anexemplary earthworking machine 12.Earthworking machine 12 may be a mobile machine that performs some type of operation associated with an industry such as mining, construction, farming, or other industry known in the art. For example,earthworking machine 12 may be a dozer, a loader, a backhoe, an excavator, a motor grader, or any other earthworking machine known in the art.Earthworking machine 12 may be configured to traverse awork site 10 to removematerial 100 from and/or addmaterial 100 to locations withinwork site 10.Earthworking machine 12 may include aframe 14, anearthworking implement 16, and acontrol system 18. -
Frame 14 may include any structural unit that supports movement ofearthworking machine 12.Frame 14 may be, for example, a stationary base frame connecting a power source (not shown) to atraction device 24, a movable frame member of a linkage system, or any other type of frame known in the art. It is contemplated thattraction device 24 may include tracks, wheels, and/or other traction devices known in the art. -
Earthworking implement 16 may include a device used in the performance of material handling. For example,earthworking implement 16 may include a blade, a scraper, a bucket, a shovel, and/or other types of earthworking implements known in the art.Earthworking implement 16 may be coupled toframe 14 via ahydraulic cylinder 20 and alinkage system 22 and may be selectively movable relative toframe 14 byhydraulic cylinder 20. Additionally,earthworking implement 16 may be moved relative to asurface 102 ofmaterial 100 to removematerial 100 fromwork site 10.Earthworking implement 16 may be configured to pivot, rotate, slide, swing, or otherwise move relative toframe 14 in any manner known in the art. It is contemplated thatearthworking implement 16 may include multiple earthworking implements. - Referring to
FIG. 2 ,control system 18 may be configured to control the operation ofearthworking machine 12 and, in particular, configured to controlearthworking implement 16.Control system 18 may include acommand controller 400, aproductive controller 402, and acontour controller 404, and may be configured to interact withhydraulic cylinder 20 to control the extension and/or retraction thereof to affect movement ofearthworking implement 16.Control system 18 may also be configured to interact withauxiliary devices 50 such as, for example, a power source, a steering apparatus, drive train apparatus, and/or other devices used to operateearthworking machine 12 and/or components thereof to selectively and/or dynamically affect movement thereof overwork site 10. It is contemplated thatcontrol system 18 may additionally include other components, such as, for example, operator interfaces, visual displays, warning indicators, sensors, and/or other components known in the art to display, affect, and/or control the operation ofearthworking machine 12 and/or components thereof. It is also contemplated thatcontrol system 18 may includecommand controller 400,productive controller 402, andcontour controller 404 embodied as a single controller, two controllers, and/or any number of controllers, as desired. -
Productive controller 402 may be configured to determine a productive depth of cut of earthworking implement 16 relative tosurface 102 to maximize the productive removal ofmaterial 100 fromwork site 10. The productive depth of cut may be based in part on the power capability ofearthworking implement 16, which may be based in part on the ability of earthworking implement 16 to productively removematerial 100 fromwork site 10. Productive controller may be further configured to output a command signal DP, indicative of the determined productive depth of cut, to commandcontroller 400 to affect the movement of earthworking implement 16 in response to the determined productive depth of cut. For example, ifproductive controller 402 determines thatearthworking implement 16 is operating at a depth of cut shallower than an optimal productivity, e.g.,earthworking implement 16 may be unproductively removing too small an amount ofmaterial 100,productive controller 402 may be configured to output command signal DP tocommand controller 400 which would lower earthworking implement 16 deeper intomaterial 100. Similarly, ifproductive controller 402 determines thatearthworking implement 16 is operating at a depth of cut deeper than an optimal predetermined productivity, e.g.,earthworking implement 16 may be unproductively removing too great an amount ofmaterial 100,productive controller 402 may be configured to output command signal DP tocommand controller 400 which would raise earthworking implement 16 higher withinmaterial 100. As such,productive controller 402 may output, to commandcontroller 400, command signal DP adapted to control the depth of cut of earthworking implement 16 withinmaterial 100 to achieve a productive removal thereof. It is contemplated thatproductive controller 402 may dynamically output command signal DP tocommand controller 400 in response to varying work site conditions and/or other conditions that may affect command signal DP, such as, for example, operational capabilities ofearthworking machine 12 and/or material properties ofmaterial 100. - For example,
productive controller 402 may determine the productive depth of cut and output command signal DP through a predetermined algorithm as a function of signals received from a ground speed sensor (not shown), a slope detector (not shown), a slip detector (not shown), and/or a tilt sensor (not shown). The power ofearthworking implement 16 may be determined and/or based in part on the sensed ground speed ofearthworking machine 12, the detected slope ofwork site 10, the detected slip oftraction device 24, the sensed tilt of earthworking implement 16, and/or the relationships thereof with the amount ofmaterial 100 being removed byearthworking implement 16.Productive controller 402 may be configured to determine the productive depth of cut based in part on the power ofearthworking implement 16 determined by the predetermined algorithm analyzing the sensed data and/or comparing such data with look-up tables, databases, and/or other known mathematical manipulations. Additionally,productive controller 402 may be configured to determine the actual depth of cut of earthworking implement 16 in part based on the position of earthworking implement 16 relative toearthworking machine 12 and/orsurface 102 and compare the determined productive depth of cut and the actual depth of cut to output command signal DP to affect movement of earthworking implement 16 toward the productive depth of cut. It is contemplated thatproductive controller 402, through the predetermined algorithm, may also determine command signal DP based in part on error feedback terms and mathematical constants as is known in the art.Productive controller 402 may embody any known or conventional apparatus and method configured to maximize the productive removal of material from a work site. It is further contemplated thatproductive controller 402 may include any controller, method, and/or algorithm configured to determine a depth of cut based on the power capability of an earthworking implement by analyzing, sensing, and/or monitoring known operational parameters of the earthworking implement, an earthworking machine, and/or work site properties. -
Contour controller 404 may be configured to determine a contour depth of cut of earthworking implement 16 relative tosurface 102 to removematerial 100 fromworksite 10 to achieve a desired grade.Contour controller 404 may be further configured to output a command signal DC, indicative of the determined contour depth of cut, to commandcontroller 400 to affect the position of earthworking implement 16 in response to the determined contour position. For example, ifcontour controller 404 determines that earthworking implement 16 is operating at a depth of cut above a predetermined desired grade, i.e., earthworking implement 16 is not removing material that is desired to be removed,contour controller 404 may be configured to output command signal DC which would commandcontroller 400 to lower earthworking implement 16 deeper intomaterial 100. Similarly, ifcontour controller 404 determines that earthworking implement 16 is operating at a depth of cut below a predetermined desired level, i.e., earthworking implement 16 is removingmaterial 100 that is desired to remain,contour controller 404 may be configured to output command signal DC which would commandcontroller 400 to raise earthworking implement 16 higher withinmaterial 100. As such,contour controller 404 may output, to commandcontroller 400, command signal DC adapted to control the depth of cut of earthworking implement 16 withinmaterial 100 to achieve a desired grade. It is contemplated thatcontour controller 404 may additionally include command outputs to control and/or operate warning signals, alarms, visual displays, and/or other informational components that may be activated to indicate an operating status ofcontour controller 404 and, in particular, earthworking implement 16 andearthworking machine 12. It is contemplated thatcontour controller 404 may dynamically output command signal DC to commandcontroller 400 in response to varying work site conditions and/or other conditions that may affect command signal DC, such as, for example, varying depth of desired contour and/or varying contour ofsurface 102. - For example,
contour controller 404 may determine the contour depth of cut through a predetermined algorithm based in part on work site geographies and may include a desired work site geography model and an actual work site geography model. Contour controller may be configured to receive an initial work site geography determined, for example, by manual site survey, automated site survey systems utilizing stereo photography and data processors, and/or geological core sampling methods. The initial work site geography model may be stored within a data storage device (not shown) and configured to be accessible by a global positioning system (“GPS”) via the algorithm. As earthworkingmachine 12 traverses worksite 10, the GPS may be further configured to monitor position coordinates of earthworkingmachine 12 relative to worksite 10 and communicate data to the algorithm, which in turn may determine the actual work site geography as changes are made thereto by earthworking implement 16.Contour controller 404 may also be configured to determine the position of earthworking implement 16 relative to earthworkingmachine 12.Contour controller 404 may be further configured to output command signal DC based on the difference between the actual and desired work site geography models to control earthworking implement 16 and/orearthworking machine 12 to removematerial 100 and bring the actual work site into conformity with the desired work site geography model. It is further contemplated thatcontour controller 404 may include any controller, method, and/or algorithm configured to determine a depth of cut of an earthworking implement based in part on a desired grade of a work site by analyzing, sensing, and/or monitoring known operational parameters and/or locations of the earthworking implement, an earthworking machine, and/or work site properties. -
Command controller 400 may be configured to monitor and regulate command signals DP and DC outputted fromproductive controller 402 andcontour controller 404, respectively, to thereby control movement of earthworking implement 16.Command controller 400 may receive command signals DP and DC and may determine which of command signals DP or DC would control earthworking implement to operate at a higher depth of cut withinmaterial 100.Command controller 400 may further be configured to output a command signal DI indicative of one of command signals DP and DC determined to control earthworking implement 16 to a higher depth of cut.Command controller 400 may further be configured to output command signal DI to affect movement ofhydraulic cylinder 20, via a hydraulic circuit (not shown), to control earthworking implement 16 to a working depth of cut. Additionally,command controller 400 may be configured to override the other one of command signals DP and DC not determined to control earthworking implement 16 to a higher depth of cut. It is contemplated that command controller may allow the one of command signals determined to control earthworking implement 16 to a higher depth of cut to directly controlhydraulic cylinder 20 to the working depth of cut. It is also contemplated thatcommand controller 400 may alternatively control other components ofearthworking machine 12 to affect the movement of earthworking implement 16 to the working depth of cut, such as, for example, hydraulic valve actuators, direct electronic actuators, mechanically geared actuators, and/or other components known in the art. It is also contemplated thatcommand controller 400,productive controller 402, andcontour controller 404 may be integrated into a common controller. It is further contemplated thatcommand controller 400 may additionally affect and/or control operation and movement ofearthworking machine 12 overwork site 10. -
FIG. 3 illustrates anexemplary method 500 ofcommand controller 400 to control movement of earthworking implement 16.Method 500 may include a comparing command signal DP and command signal DC,step 502, outputting a command signal DI indicative of command signal DC,step 504, and outputting a command signal DI indicative of command signal DP. Specifically,method 500 may compare command signals DP and DC instep 502 and determine if command signal Dc corresponds to a higher depth of cut than command signal DP. If command signal DC corresponds to a higher depth of cut,method 500 may progress to step 504 wherein command controller may output command signal DI indicative of command signal DC. If command signal DC does not correspond to a higher depth of cut,method 500 may progress to step 506 wherein command controller may output command signal DI indicative of command signal DP. - Step 502 may compare command signals DP and DC and determine if command signal DC would affect movement of earthworking implement 16 to a higher depth of cut than command signal DP. The comparison of command signals DP and DC and the determination of whether command signal DC would control earthworking implement 16 to a higher depth of cut than would command signal DP may be determined by an algorithm and may be based in part on look-up tables, calculations, and/or other mathematically suitable methods known in the art to compare signals.
- Step 504 may include
command controller 400 outputting command signal DI configured to affect control of earthworking implement 16 to a depth of cut indicative of command signal DC. Specifically, command signal DI may be in part based on command signal DC and may control the movement of earthworking implement 16 viahydraulic cylinder 20. Additionally,command controller 400 may prohibit command signal DP from affecting movement of earthworking implement 16. Specifically,command controller 400 may selectively suspendproductive controller 402 from outputting command signal DP. - For example,
command controller 400 may selectively suspend command signal DP from affecting movement of earthworking implement 16.Command controller 400 may selectively suspend command signal DP by an integrated circuit logic, an algorithm and/or other control means known in the art. It is contemplated thatcommand controller 400 may also selectively suspend calculation of any error feedback terms. Specifically,command controller 400 may override the calculation of the error feedback term by fixing the term to zero by an integrated circuit logic, an algorithm and/or other control means known in the art. Selectively overriding the calculation of any error feedback terms may eliminateproductive controller 402 from outputting command signal DP which would affect a large actuation of earthworking implement 16 whencommand controller 400 outputs command signal DI indicative of command signal DP subsequent to outputting command signal DI indicative of command signal DC. - Step 506 may include
command controller 400 outputting command signal DI to affect control of earthworking implement 16 to a depth of cut indicative of command signal DP when command signal DC is not higher than command signal DP. Specifically, command signal DI may be based in part on command signal DP and may control the movement of earthworking implement 16 viahydraulic cylinder 20. Additionally,command controller 400 may prohibit command signal DC from affecting movement of earthworking implement 16. Specifically,command controller 400 may selectively suspendcontour controller 404 from outputting command signal Dc and other command signals which would controlearthworking machine 12 and/or earthworking implement 16, and also control additional instructional and/or warning signals indicative of the operating status ofcontour controller 404 andearthworking machine 12. - For example,
command controller 400 may selectively suspend command signal DC. Command controller 400 may selectively suspend command signal DC by an integrated circuit logic, an algorithm and/or other control means known in the art. It is contemplated thatcommand controller 400 may also selectively suspend additional instructional and/or warning signals indicative of the operating status ofcontour controller 404 andearthworking machine 12 by an integrated circuit logic, an algorithm and/or other control means known in the art. -
Method 500 may additionally be configured to return tocontrol 502 aftersteps step 502 regarding command signals DC and DP,method 500 may progress to step 504 or step 506 andmethod 500 may be repeated as necessary or desired by an operator to remove material 100 fromwork site 10. As such,method 500 may continuously monitor and compare command signals DC and DP andcommand controller 400 may dynamically output command signal DI indicative of the one of command signals DC and DP that would control earthworking implement to a higher depth of cut. It is contemplated thatmethod 500 may further include additional steps such as, for example, an initialization step (not shown), an end step (not shown), a suspend/pause step (not shown), or other control features known in the art. - The disclosed method and apparatus of controlling an earthworking implement may be applicable to any earthworking machine that removes material from a work site. The disclosed method and apparatus may provide productive material removal while bringing actual work site geography into desired work site geography. The operation of the method and apparatus of controlling earthworking implement 16 is explained below.
-
Earthworking machine 12 may be used to remove material 100 fromwork site 10 to achieve a desired grade. Specifically, earthworkingmachine 12 may traversework site 10 to removematerial 100 to expose a layer of desired material and/or provide a desired contour. As earthworkingmachine 12 traverses worksite 10, earthworking implement 16 may be raised and/or lowered relative to surface 102 ofmaterial 100 to affect the removal ofmaterial 100 fromwork site 10. As earthworking implement 16 affects removal ofmaterial 100,control system 18 may monitor and control the position of earthworkingmachine 12 relative to worksite 10 and the position of earthworking implement 16 relative to earthworkingmachine 12 to productively removematerial 100 while achieving a desired grade. - As earthworking machine traverses
work site 10,productive controller 402 may output control signal DP to commandcontroller 400 that would control earthworking implement 16 to be moved relative tosurface 102. Specifically,productive controller 402 may determine that earthworking implement, andearthworking machine 12, may be capable of removingmore material 100 than that currently being removed and/or may be currently be removing toomuch material 100. Substantially simultaneously,contour controller 404 may output command signal DC to commandcontroller 400 that would control earthworking implement 16 to be moved relative tosurface 102. Specifically,contour controller 404 may determine thatsurface 102 ofmaterial 100 is not the desired grade and thus thatmaterial 100 needs to be removed and/or thatsurface 102 is the desired grade and that nomaterial 100 needs to be removed. -
Command controller 400 may compare (referring toFIG. 3 ) command signals DP and DC to determine which of command signals DP and DC is configured to control earthworking implement 16 to a higher depth of cut belowsurface 102.Command controller 400 may then output command signal DI, indicative of the one ofproductive controller 402 andcontour controller 404 that would control earthworking implement 16 to a higher depth of cut to thereby control earthworking implement 16. For example, ifcommand controller 400 determines that command signal DC would control earthworking implement 16 to a higher depth of cut (i.e.,productive controller 402 would control earthworking implement below the desired grade),command controller 400 may output command signal DI indicative of command signal DC to control earthworking implement 16. Similarly, ifcommand controller 400 determines that command signal DP would control earthworking implement 16 to a higher depth of cut (i.e.,contour controller 404 would control earthworking implement 16 to a depth at which earthworking implement 16 may no longer productively remove material 100),command controller 400 may output command signal DI indicative of command signal DP to control earthworking implement 16. It is contemplated thatcommand controller 400 may, alternatively, allow the one of command signals DP and DC that would control earthworking implement 16 to a higher depth of cut to directly control earthworking implement 16. - The following operation of
control system 18, and in particular,command controller 400 is illustrated with reference to earthworkingmachine 12 during several passes acrosswork site 10 from a unmodified work site toward a desired grade. It is noted that the explanation below is for clarification purposes only, and the method and apparatus may be applicable for any earthworking machine at any status of material removal fromwork site 10. - For example, as earthworking
machine 12 makes a first pass acrosswork site 10, earthworking implement 16 may be positioned abovesurface 102 and may not removematerial 100. It is likely, however, thatsurface 102 may not be at the desired grade and bothproductive controller 402 andcontour controller 404 may determine and output respective command signals DP and DC that would lower earthworking implement 16 belowsurface 102. Specifically,productive controller 402 may output a command signal DP to commandcontroller 400 that would lower earthworking implement 16 to a productive depth of cut to productively removematerial 100. Similarly,contour controller 404 may substantially simultaneously output command signal DC to commandcontroller 400 that would lower earthworking implement 16 toward a contour depth of cut to achieve a desired grade. It is noted that command signals DP and DC may each affect a lowering of earthworking implement 16 toward the desired grade ofwork site 10.Command controller 400 may monitor and determine which of command signals DP and DC would control earthworking implement 16 to a higher depth of cut (seeFIG. 3 , step 502). Becausesurface 102 may not be at the desired grade,command controller 400 may move earthworking implement 16 lower intomaterial 100 belowsurface 102 in response to one of command signals DP or DC. It is contemplated that earthworking implement 16 may gradually be lowered intomaterial 100 belowsurface 102 to begin removingmaterial 100 due to movement ofearthworking machine 12 relative to worksite 10 and time necessary to move earthworking implement 16 from an preexisting depth of cut to subsequent depth of cut. - Assuming that a relatively small amount of
material 100 is desired to be removed fromwork site 10, command signal DC may control earthworking implement 16 to a higher depth of cut than would command signal DP. Specifically,command controller 400 may determine that command signal DC would control earthworking implement 16 to a higher depth of cut than would command signal DP (seeFIG. 3 , step 502) and may output command signal DI to control earthworking implement 16 to a depth of cut indicative of command signal DC (seeFIG. 3 , step 504). For example, earthworkingmachine 12 may be capable of moving a large amount ofmaterial 100 but only a relatively small amount of material needs to be removed to achieve the desired grade. As such,productive controller 402 may output command signal DP that would, if allowed to control earthworking implement 16, lower earthworking implement 16 below the desired grade, which may be undesirable. - As earthworking
machine 12 continues the first pass acrosswork site 10 with earthworking implement 16 controlled belowsurface 102 ofmaterial 100, the amount ofmaterial 100 removed by earthworking implement 16 may increase. Specifically, newly removedmaterial 100 may combine with previously removedmaterial 100 and may build up in front of earthworking implement 16. As the amount of removedmaterial 100 increases, earthworking implement 16 may no longer be able to productively removematerial 100 at the contour depth of cut andproductive controller 402 may output command signal DP that would control earthworking implement 16 at a higher depth of cut than would command signal DC. -
Command controller 400 may continually monitor command signals DC and DP, and may determine that command DP would control earthworking implement 16 to a higher depth of cut than would command signal DC (seeFIG. 3 , step 502) and may output command signal DI to control earthworking implement 16 to a depth of cut indicative of command signal DP (seeFIG. 3 , step 506). For example, earthworking implement 16 may no longer be capable of productively removingmaterial 100 at the desired grade as controlled bycontour controller 404 because of the increasing amount ofmaterial 100 removed by earthworking implement 16. As a result, earthworking implement 16 may be raised to a higher depth of cut, i.e., earthworking implement 16 may no longer be controlled to the contour depth of cut and instead may be controlled to the productive depth of cut. - As earthworking
machine 12 continues the first pass,contour controller 404 may monitor the desired work site geography and the actual work site geography and dynamically output command signal DC to affect earthworking implement 16 toward a contour depth of cut. Similarly,productive controller 402 may monitor the operating conditions of earthworkingmachine 12 and/or earthworking implement 16 and dynamically output command signal DP to affect earthworking implement 16 toward a productive depth of cut. Accordingly,command controller 400 may monitor dynamically outputted command signals DC and DP and may thus dynamically output command signal DI to dynamically control the depth of earthworking implement 16. For example, the desired geography and/or actual geography ofwork site 10 may vary and command signals DC and DP may correspondingly vary depending upon the location of earthworkingmachine 12 relative to worksite 10 and/or the amount of material desired to be removed. For example, the actual and/or desired grade may include variable slopes and as a result may include a dynamically changing difference between the actual grade and the desired grade resulting incontour controller 404 andproductive controller 402 dynamically determining command signals DC and DP that would control earthworking implement 16 to respective dynamic depths of cut. - As earthworking
machine 12 makes a second pass acrosswork site 10, earthworking implement 16 may be positioned abovesurface 102. However,surface 102 may now be at the desired grade because during the first pass,contour controller 404 affected control of earthworking implement 16 to the desired grade. Accordingly,contour controller 404 may output command signal DC that would not lower earthworking implement belowsurface 102 because the desired grade has been achieved. However, because earthworking implement 16 may not be removingmaterial 100,productive controller 402 may output command signal DP that would lower earthworking implement belowsurface 102 because earthworking implement 16 is capable of productively removingmore material 100.Controller 400 may monitor command signals DC and DP and output command signal DI indicative of command signal DC to control earthworking implement 16. - As earthworking
machine 12 continues the second pass,surface 102 may at some point no longer be at the desired grade. This may occur because earthworking implement 16 may have been raised during the first pass in response to command signal DP. Accordingly,contour controller 404 andproductive controller 402 may determine and output respective command signals DC and DP that would lower earthworking implement 16 belowsurface 102. Again assuming a relatively small amount ofmaterial 100 is desired to be removed,controller 400 may output command signal DI indicative of command signal DC to control earthworking implement 16 toward the contour depth of cut. As earthworkingmachine 12 continues the second pass, and similar to the first pass, the amount ofmaterial 100 removed by earthworking implement 16 may increase and earthworking implement 16 may no longer be able to productively removematerial 100 at the contour depth.Productive controller 402 may output command signal DP that would control earthworking implement 16 at a higher depth of cut than would command signal DC and accordingly,controller 400 may output command signal DI indicative of command signal DP to control earthworking implement 16. - As earthworking
machine 12 makes subsequent passes acrosswork site 10, the operation explained above may be continued as necessary to achieve the desired grade. Each subsequent pass may bring the actual work site geography closer toward the desired work site geography. It is contemplated thatwork machine 12 may begin subsequent passes at the point wheresurface 102 ofmaterial 100 is no longer at the desired grade. Specifically, earthworking machine may not need to start subsequent passes at the same origin as previous passes because the desired grade may have been achieved therein. - Because
command controller 400 monitors command signals DP and DC and controls earthworking implement 16 in response to the one of command signals DP and DC that would control earthworking implement to a higher depth of cut, removal of material fromwork site 10 may be performed productively and to a desired grade. This monitoring may eliminate the unintended removal of material desired to remain inwork site 10 and may increase the productive removal of material that is desired to be removed. The overall productivity of transforming a work site from actual geography to desired geography may be increased. - It will be apparent to those skilled in the art that various modifications and variations can be made to the disclosed method and apparatus for controlling an earthworking implement. Other embodiments will be apparent to those skilled in the art from consideration of the specification and practice of the disclosed method and apparatus for controlling an earthworking implement. It is intended that the specification and examples be considered as exemplary only, with a true scope being indicated by the following claims and their equivalents.
Claims (24)
1. A method for controlling an earthworking implement of an earthworking machine comprising:
determining a first depth of cut of the earthworking implement at least partially based on a power capability of the earthworking implement;
determining a second depth of cut of the earthworking implement at least partially based on a desired grade of a work site; and
moving the earthworking implement in response to at least one of the first depth of cut and the second depth of cut.
2. The method of claim 1 , further including moving the earthworking implement to the determined first depth of cut when the magnitude of the determined first depth of cut is less than the magnitude of the determined second depth of cut.
3. The method of claim 1 , further including moving the earthworking implement to the determined second depth of cut when the magnitude of the determined second depth of cut is less than the magnitude of the determined first depth of cut.
4. The method of claim 1 , wherein moving the earthworking implement includes selectively moving the earthworking implement to the one of the determined first depth of cut and the determined second depth of cut having a smaller magnitude and subsequently selectively moving the earthworking implement to the other of the determined first depth of cut and the determined second depth of cut.
5. The method of claim 1 , further including
producing a first depth of cut signal at least partially based on the determined first depth of cut;
producing a second depth of cut signal at least partially based on the determined second depth of cut; and
monitoring the first depth of cut signal and the second depth of cut signal.
6. The method of claim 5 , further including:
producing a command signal at least partially based on one of the first depth of cut signal and the second depth of cut signal; and
moving the earthworking implement in response to the command signal.
7. The method of claim 5 , wherein:
producing the first depth of cut signal includes determining a desired productive depth of cut, determining an actual depth of cut of the earthworking implement, and determining a difference between the desired productive depth of cut and the actual depth of cut of the earthworking implement.
8. The method of claim 7 , further including:
prohibiting the first depth of cut signal from affecting movement of the earthworking implement when the magnitude of the second depth of cut is less than the magnitude of the first depth of cut.
9. The method of claim 8 , wherein prohibiting the first depth of cut signal includes selectively overriding the calculated difference.
10. The method of claim 5 , wherein:
producing the second depth of cut signal includes comparing an actual geographic model of a work site with a desired geographic model of the work site and determining a location of an earthworking machine and the earthworking implement with respect to the actual and desired geographic models of the work site.
11. The method of claim 10 , further including:
prohibiting the second depth of cut signal from affecting movement of the earthworking implement when the magnitude of the first depth of cut is less than the magnitude of the second depth of cut.
12. The method of claim 11 , wherein prohibiting the second depth of cut signal includes selectively suspending the output of the second depth of cut signal.
13. A method of moving an earthworking implement of an earthworking machine comprising:
moving the earthworking implement toward a first depth of cut wherein the first depth of cut is at least partially based on a desired grade; and
automatically moving the earthworking implement toward a second depth of cut wherein the second depth of cut is different than the first depth of cut and the second depth of cut is at least partially based on a power capability of the earthworking implement.
14. The method of claim 13 , wherein the second depth of cut is shallower than the first depth of cut, the method further including automatically moving the earthworking implement toward a third depth of cut wherein the third depth of cut is at least partially based on a desired grade.
15. The method of claim 13 , wherein the second depth of cut is shallower than the first depth of cut, the method further including automatically moving the earthworking implement toward a third depth of cut wherein the third depth of cut is shallower than the second depth of cut.
16. The method of claim 13 , wherein the second depth of cut is deeper than the first depth of cut, the method further including automatically moving the earthworking implement toward a third depth of cut wherein the third depth of cut is shallower than the second depth of cut.
17. The method of claim 16 , wherein the third depth of cut is at least partially based on the power capability of the earthworking implement.
18. The method of claim 13 , further including:
controlling the earthworking implement with a control system; and
dynamically outputting a command signal from the control system to automatically move the earthworking implement to one of the first and second depths of cut.
19. The method of claim 13 , further including:
moving the earthworking implement to the first depth of cut wherein the first depth of cut is the desired grade; and
removing a first layer of material from a work site to achieve the desired grade.
20. An earthworking machine comprising:
a frame;
a traction device;
a earthworking implement;
a controller operably connected to the earthworking implement and configured to compare a first depth of cut signal indicative of a productive depth of cut and a second depth of cut signal indicative of a contour depth of cut and further configured to selectively move the earthworking implement to a working depth of cut in response to at least one of the first depth of cut signal and the second depth of cut signal.
21. The earthworking machine of claim 20 , wherein the controller is configured to selectively move the earthworking implement in response to the first depth of cut when the magnitude of the first depth of cut is less than the magnitude of the second depth of cut.
22. The earthworking machine of claim 20 , wherein the controller is configured to selectively move the earthworking implement in response to the second depth of cut when the magnitude of the second depth of cut is less than the magnitude of the first depth of cut.
23. The earthworking machine of claim 20 , wherein determining a productive depth of cut includes sensing one or more of the following:
the speed of the earthworking machine,
the slope of a work site in which the earthworking machine is located,
the slip of the of the traction device, and
the tilt of the earthworking implement.
24. The earthworking machine of claim 20 , wherein determining a contour depth of cut includes:
comparing a desired geographic model of a work site with an actual geographic model of a work site;
sensing the position of the earthworking machine relative to the desired and actual geographic models of the work site; and
sensing the position of the earthworking implement relative to the earthworking machine.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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US11/214,993 US20070044980A1 (en) | 2005-08-31 | 2005-08-31 | System for controlling an earthworking implement |
CNA2006800318677A CN101253297A (en) | 2005-08-31 | 2006-07-28 | System for controlling an earthworking implement |
AU2006285315A AU2006285315A1 (en) | 2005-08-31 | 2006-07-28 | System for controlling an earthworking implement |
EP06788637A EP1941105A1 (en) | 2005-08-31 | 2006-07-28 | System for controlling an earthworking implement |
PCT/US2006/029151 WO2007027330A1 (en) | 2005-08-31 | 2006-07-28 | System for controlling an earthworking implement |
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Application Number | Priority Date | Filing Date | Title |
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US11/214,993 US20070044980A1 (en) | 2005-08-31 | 2005-08-31 | System for controlling an earthworking implement |
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US20070044980A1 true US20070044980A1 (en) | 2007-03-01 |
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US11/214,993 Abandoned US20070044980A1 (en) | 2005-08-31 | 2005-08-31 | System for controlling an earthworking implement |
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US (1) | US20070044980A1 (en) |
EP (1) | EP1941105A1 (en) |
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Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
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US10794039B2 (en) * | 2018-08-08 | 2020-10-06 | Caterpillar Inc. | System and method for controlling the operation of a machine |
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Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
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US8083004B2 (en) | 2007-03-29 | 2011-12-27 | Caterpillar Inc. | Ripper autodig system implementing machine acceleration control |
US20090056961A1 (en) * | 2007-08-31 | 2009-03-05 | Imed Gharsalli | Machine with automated blade positioning system |
US8103417B2 (en) | 2007-08-31 | 2012-01-24 | Caterpillar Inc. | Machine with automated blade positioning system |
US20120253609A1 (en) * | 2011-03-31 | 2012-10-04 | Caterpillar Inc. | Proportional control using state space based scheduling |
WO2013095906A1 (en) * | 2011-12-20 | 2013-06-27 | Caterpillar Inc. | Implement control system for a machine |
US9228315B2 (en) | 2012-12-20 | 2016-01-05 | Caterpillar Inc. | System and method for modifying a path for a machine |
US9014922B2 (en) | 2012-12-20 | 2015-04-21 | Caterpillar Inc. | System and method for optimizing a cut location |
US9014924B2 (en) | 2012-12-20 | 2015-04-21 | Caterpillar Inc. | System and method for estimating material characteristics |
US8948981B2 (en) | 2012-12-20 | 2015-02-03 | Caterpillar Inc. | System and method for optimizing a cut location |
US9469967B2 (en) | 2014-09-12 | 2016-10-18 | Caterpillar Inc. | System and method for controlling the operation of a machine |
US11371218B2 (en) * | 2016-11-01 | 2022-06-28 | Komatsu Ltd. | Control system for work vehicle, control mei'hod, and work vehicle |
US20190390435A1 (en) * | 2017-03-30 | 2019-12-26 | Komatsu Ltd. | Control system for work vehicle, method for setting trajectory of work implement, and work vehicle |
US11578470B2 (en) * | 2017-03-30 | 2023-02-14 | Komatsu Ltd. | Control system for work vehicle, method for setting trajectory of work implement, and work vehicle |
WO2018179384A1 (en) * | 2017-03-31 | 2018-10-04 | 株式会社小松製作所 | Control system for work vehicle, method for setting trajectory for work machine, and work vehicle |
JPWO2018179384A1 (en) * | 2017-03-31 | 2020-02-06 | 株式会社小松製作所 | Work vehicle control system, work machine trajectory setting method, and work vehicle |
US11111653B2 (en) | 2017-03-31 | 2021-09-07 | Komatsu Ltd. | Control system for work vehicle, method for setting trajectory of work implement, and work vehicle |
CN110820823A (en) * | 2018-08-08 | 2020-02-21 | 迪尔公司 | System and method for soil management of implements |
US10794039B2 (en) * | 2018-08-08 | 2020-10-06 | Caterpillar Inc. | System and method for controlling the operation of a machine |
Also Published As
Publication number | Publication date |
---|---|
WO2007027330A1 (en) | 2007-03-08 |
AU2006285315A1 (en) | 2007-03-08 |
EP1941105A1 (en) | 2008-07-09 |
CN101253297A (en) | 2008-08-27 |
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