WO1999027235A1 - Method and system start-up apparatus for removing air and debris from a valve actuation system - Google Patents
Method and system start-up apparatus for removing air and debris from a valve actuation system Download PDFInfo
- Publication number
- WO1999027235A1 WO1999027235A1 PCT/US1998/024832 US9824832W WO9927235A1 WO 1999027235 A1 WO1999027235 A1 WO 1999027235A1 US 9824832 W US9824832 W US 9824832W WO 9927235 A1 WO9927235 A1 WO 9927235A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- assembly
- valve actuation
- engine
- air
- valve
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 15
- 239000012530 fluid Substances 0.000 claims abstract description 88
- 230000005484 gravity Effects 0.000 claims abstract description 6
- 238000012546 transfer Methods 0.000 claims description 20
- 238000010438 heat treatment Methods 0.000 claims description 10
- 239000003921 oil Substances 0.000 description 13
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000005273 aeration Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000013022 venting Methods 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000010705 motor oil Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 206010033799 Paralysis Diseases 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- -1 for example Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000000276 sedentary effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/06—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for braking
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/46—Component parts, details, or accessories, not provided for in preceding subgroups
Definitions
- the present invention relates to an engine valve operating system for controlling intake and exhaust events for an internal combustion engine.
- the invention is directed to an operating system for filling the valve operating system with hydraulic fluid and removing air from the valve operating system at engine start up and while the system is running. Additionally, the invention relates to the removal of bulk air from a valve actuation system.
- Conventional valve operating systems consist of combinations of camshafts, push- rods or push-tubes, rocker-.arms, and valve-lifters.
- Camshaft rotation is mechanically slaved to the crankshaft rotation of the engine. Consequently, valve openings, and closings, are fixed to the rotation of a crankshaft.
- Full authority is defined as having the ability to control the openings, and closings, of an internal combustion engine's intake and exhaust valves independent of the engine's crankshaft rotational position.
- the control of exhaust and intake valves of four-cycle internal combustion engines conventionally, is achieved by mechanical or hydromechanical systems operated synchronously with the engine's crankshaft rotation.
- valve openings is fixed in relationship to the crankshaft's position by direct mechanical linking of the valve actuating system with the crankshaft.
- intake and exhaust valve openings and closings in conjunction with the fuel mixture and either ignition or fuel injection, are predetermined to provide optimum positive power over a range of engine speeds.
- Oil aeration occurs when oil and air are mixed together. Aeration encompasses four distinct forms: air dissolved in oil, entrained air, bulk air, and foam.
- Bulk air refers to large masses of trapped air, such as air pockets. In a brake housing this situation is created when oil leaks out around pistons .and set screws after the engine has sat for a duration of time. Air dissolved in oil assumes a position in the chemical matrix of oil. Entrained air describes pockets of air that are uniformly suspended throughout oil yet are not assimilated into oil like dissolved air. The delineating factor between entrained and bulk air is the size of the voids each creates. Typically, everything 1mm in diameter and less is defined as entrained air. Hence, bulk air assumes everything larger than 1mm in diameter. Finally, foam is the occurrence of a separate layer of air bubbles on the surface of a fluid.
- Fully hydraulic valve actuation systems are subject to aeration of the oil. Prolonged sedentary states of the engine also promote the accumulation of bulk air in the hydraulic housing due to leak down. Bulk air in the system, especially in the start up mode, may adversely impact the valve motion. In particular, depending on the amount of air entrapped in the system at start-up, the entrapped air may delay or possibly preclude valve opening in response to the hydraulic fluid being pumped through the system. Without the removal of the existing bulk air, the system may become paralyzed or function improperly, which may cause valve opening at non-prescribed timings.
- the present invention comprises a device for the removal of bulk air from a full authority valve operating the system. It also allows for the removal of entrained air once the valve operating system is operational. A small continuous leak provides the system with a way to circulate the oil through the hydraulic circuit, which allows for the removal of particles and cooling of the housing.
- the present invention is directed to an improved valve actuation system for actuating at least one valve in an engine during an engine operation.
- the valve actuation system includes a master piston assembly for supplying actuating energy for actuating the at least one valve, a slave piston assembly for actuating the at least one valve, and a transfer assembly for transferring the actuating energy from the master piston assembly to the slave piston assembly.
- the improved valve actuation system includes a removal assembly for removing at least one of air and debris from the transfer assembly during an engine start up operation.
- the removal assembly may include a supply assembly for supplying fluid to the transfer assembly under high pressure.
- the supply assembly may include a passageway connected to a high pressure fluid source.
- the supply assembly may comprise a storage assembly for storing a supply of hydraulic fluid, and a fluid supply assembly for supplying fluid to the storage assembly.
- the fluid may be supplied under pressure from the storage assembly to the transfer assembly. Furthermore, the fluid may be supplied under the influence of gravity from the storage assembly to the transfer assembly.
- the removal assembly may include at least one bleeder assembly for removing at least one of air and debris from the transfer assembly during an engine start up operation.
- the at least one bleeder assembly may further remove at least one of air and debris from the transfer assembly during a braking operation.
- the at least one bleeder assembly may be located in a high pressure portion of the transfer assembly.
- the at least one bleeder assembly is located in a low pressure portion of the transfer assembly.
- Each of the at least one bleeder assembly may include a valve assembly.
- the valve assembly may open at a first predetermined pressure to permit the removal of at least one of air and debris.
- the valve assembly may close at a second predetermined pressure to prevent the removal of at least one of air and debris.
- the second predetermined pressure is greater than the first predetermined pressure.
- the valve actuation system may further include an accumulator assembly for absorbing actuating energy within the transfer assembly during predetermined engine operating conditions.
- the present invention is also directed to a start-up system for an engine valve actuation assembly.
- the start-up system may comprise a removal assembly for removing at least one of air and debris from the engine valve actuation assembly during an engine start up operation.
- the removal assembly may include a supply assembly for supplying fluid to the engine valve actuation assembly under high pressure to remove at least one of air and debris from the engine valve actuation assembly.
- the supply assembly may include a storage assembly for storing a supply of hydraulic fluid, and a fluid supply assembly for supplying fluid to the storage assembly.
- the fluid may be supplied under pressure from the storage assembly to the engine valve actuation assembly. Furthermore, the fluid may be supplied under an influence of gravity from the storage assembly to the engine valve actuation assembly.
- the start-up system may further include a heating assembly for heating hydraulic fluid contained within the start-up system.
- the removal assembly may include at least one bleeder assembly for removing at least one of air and debris from the engine valve actuation assembly during an engine start up operation.
- the at least one bleeder assembly may further remove at least one of air and debris during a braking operation.
- the at least one bleeder assembly may be a high pressure bleeder assembly.
- Each of the at least one bleeder assembly may be a low pressure bleeder assembly.
- Each of the at least one bleeder assembly includes a valve assembly.
- the valve assembly may open at a first predetermined pressure to permit the removal of at least one of air and debris.
- the valve assembly may close at a second predetermined pressure to prevent the removal of at least one of air and debris.
- the second predetermined pressure is greater than the first predetermined pressure.
- the start-up system may further include an accumulator assembly for absorbing actuating energy within the valve actuation assembly during predetermined engine operating conditions.
- the present invention is also directed to a method for removing at least one of air and debris from an engine valve actuation assembly during an engine start-up operation.
- the method includes the step of filling the engine valve actuation assembly with operating fluid under pressure.
- the method further includes the step of removing at least one of air and debris from the engine valve actuation assembly, wherein the pressurized operating fluid forces the at least one of air and debris from the engine valve actuation assembly.
- the step of removing at least one of air and debris may include forcing the at least one air and debris through at least one bleeder device located within the engine valve actuation assembly.
- the method may further comprise the step of heating the operating fluid during the engine start-up operation.
- the method may further include the step of absorbing excess operating fluid during the engine start-up operation.
- Fig. 1 is a schematic view of a valve control start-up system according to the present invention
- Fig. 2 is a schematic view of a valve control start-up system according to another embodiment of the present invention.
- Fig. 3 is a schematic view of a valve control start-up system according to another embodiment of the present invention.
- the present invention is directed to a system 100 for filling a valve operating system
- valve operating system 10 with hydraulic fluid during engine start up and ' to remove any air build up within the valve operating system 10.
- the valve operating system 10 includes a master piston assembly 11 that is operated by a camshaft 12.
- the master piston assembly 11 hydraulically connected to a slave piston assembly 13 through a hydraulic passageway 14.
- a valve 15 is provided within passageway 14.
- valve 15 When the valve 15 is closed, motion derived from the master piston assembly 11 is transferred directly to the slave piston assembly 13 to operate an engine valve. When the valve 15 is open, motion from the master piston assembly 11 is transferred to accumulator
- the accumulator 16 absorbs the motion derived from the master piston assembly 11 such that the slave piston assembly 13 either does not operate the associated valve or the opening of the valve is modified.
- hydraulic fluid may leak out of the system 10. This may also occur when the engine is not running. As a result, air pockets may develop within the hydraulic passageway 14. This may adversely impact the opening of an engine valve in response to movement of the master piston assembly 11, especially in a full authority system. In particular, the motion generated from the master piston assembly
- the slave piston assembly 13 may not properly operate the engine valves when necessary. The present invention prevents this from occurring.
- the start-up system 100 may be added to existing systems or may be designed into new valve operating systems.
- the system 100 includes a master piston assembly 110.
- the master piston assembly 110 may derive motion from a push tube or push rod 1 of an injector rocker. It, however, is contemplated that the present invention is not limited to a master piston assembly 110 that derives its motion from a push tube; rather a dedicated cam or any other suitable source of motion may be employed. Furthermore, it is contemplated that the master piston assembly 110 that is electronically operated in response to electronic engine controls rather than push tube be within the scope of the present invention.
- the system 100 also includes an accumulator 120.
- the system 100 is connected to the valve operating system 10 through hydraulic fluid passageway 130.
- the passageway 130 may contain a check valve 140 positioned therein.
- the check valve 140 prevents the back flow of hydraulic fluid from the system 10 to the system 100.
- the accumulator 120 may include a relief port 121 for venting hydraulic fluid to prevent buildup of excess fluid in the accumulator 120.
- the system 100 may also include a hydraulic fluid supply 150.
- the supply 150 may include a check valve 160 to prevent the back flow of hydraulic fluid from the system 100 to the supply 140.
- hydraulic fluid may have drained from the passageway 14 leaving entrapped air, which may result in insufficient fluid pressure within the system 10 to operate effectively.
- the push tube 1 supplies energy in the form of motion to the master piston assembly 110.
- hydraulic fluid from the fluid source 150 is supplied at high pressure (up to 200 psi, for example) to the valve operating system 10.
- the input of the high pressure fluid forces any air bubbles trapped within the system 10 to be vented through the slave piston assembly 13 and the master piston assembly 11.
- An air bleed device 280 may also be provided within system 10 and system 100 to permit the venting of air entrapped within systems 10 and 100.
- the system 100 may continuously operate during engine operation. In this manner, the system 100 can supply hydraulic fluid to the system 10 to remove any air entrapped within the system 10 that may result from leakage during operation.
- the accumulator 120 serves to prevent buildup of excessive pressure within the system 100.
- Fig. 2 illustrates another embodiment of the present invention.
- the start-up system 200 may be connected to a full authority valve actuating system 20.
- the valve operating system 20 includes a master piston assembly 21.
- the master piston assembly 21 is operated by a camshaft, a push tube of a rocker arm, or some other suitable source of motion.
- the master piston assembly 21 supplies motion to a slave piston assembly 23 through a conduit 22.
- the slave piston assembly 23 operates at least one cylinder valve, not shown.
- the slave piston assembly 23 may include a valve seating assembly 231 to provide smooth valve seating during operating of the slave piston assembly 23.
- the system 20 may also include a valve 24.
- the valve 24 is preferably a high speed trigger valve.
- An accumulator 25 may be provided.
- the start-up system 200 includes a pressure source 210.
- the pressure source 210 directs hydraulic fluid to a plenum 220. It is contemplated by the inventors of the present invention that the pressure source 210 may be any suitable means for supplying fluid including but not limited to an auxiliary pump (e.g., mechanical pump, electrical pump, and pressure pump), an oil sump, or other oil galley that supplies oil by other means.
- the plenum 220 may supply hydraulic fluid to more than one valve operating system.
- a hydraulic fluid source 230 supplies hydraulic fluid to the system 200 from, for example, an engine oil supply through conduit 241.
- a valve 250 e.g., a check valve
- the pressure source 210 supplies hydraulic fluid to the plenum 220 through conduit 242 such that a sufficient amount of hydraulic fluid is located within the plenum 220.
- a valve 260 may be provided between the plenum 220.and the pressure source 210 within the conduit 242 to prevent the back flow of fluid to the pressure source 210 from the plenum 220.
- the plenum 220 supplies hydraulic fluid to the valve operating system 20 through conduit 243.
- a valve 270 may be provided between the plenum 220 and the system 20 within the conduit 243 to prevent the back flow of fluid to the plenum 220.
- the plenum 220 may be provided with a bleeder device 280.
- the bleeder device 280 permits air entrapped within the plenum 220 to be vented. Furthermore, the bleeder device
- the plenum 220 may also be provided with an accumulator, as shown, for example in Fig. 1 , to prevent the buildup of excessive pressure within the plenum 220.
- the system 20 is preferably provided with a bleeder device 26 to permit the venting of entrapped air within the system 20.
- the bleeder devices described above in connection with Figs. 5-12 may be incorporated into the system 20.
- the plenum 220 may be provided with a heating element to heat the hydraulic fluid within the plenum 220. This heats the hydraulic fluid to improve the viscosity of the fluid during engine start-up.
- the operation of the start-up system 200 will now be described.
- the plenum 220 through the influence of gravity provides a pressurized supply of hydraulic fluid to the system 20. This supply limits the entrapment of air within system 20. Specifically, any air that may be within the system 20 will be forced out through clearances in the slave piston assembly 23 and the master piston assembly 21. Additionally, a bleeder assembly 26 may be provided within the system 20 to permit entrapped air to escape.
- This embodiment of the present invention relies on force generated by the stored hydraulic fluid rather than relying on the force generated by the push rod, as described above in connection with Fig. 1. With this arrangement, the system 200 is operational even when the engine is off.
- Fig. 3 discloses another embodiment of the start-up system according to the present invention.
- Fig. 3. depicts the start-up system 300 within a lost motion full authority value actuating system 30.
- the use of the system 30 is for illustrative purposes only and is not intended to limit the application of the present invention.
- System 30 includes a housing 31.
- a master piston assembly 32 may be slidably received within the housing 31.
- the master piston assembly 32 derives motion from a cam 1. Motion generated by the master piston assembly 32 is transmitted through hydraulic fluid (such as, for example, engine oil) located within a conduit 33 located within housing 31.
- the housing 31 includes at least one slave piston assembly 34 that is capable of operating at least one valve.
- the system 30 also includes a valve assembly 35.
- the valve assembly 35 is connected to a hydraulic fluid supply through conduit 36. Operation of the valve assembly 35 will permit hydraulic fluid to flow into the system 30.
- An accumulator 37 may be provided in communication with conduit 36 to absorb any build up of hydraulic fluid within the conduit 36 when the valve 35 is closed.
- the accumulator 37 is provided with a relief port 361 to vent hydraulic fluid in the event of an excessive buildup of pressure within the accumulator 37. In this manner, excess hydraulic fluid may be bled from the system 30 during each operating cycle.
- the conduit 36 is connected to the start-up system 300 according to another embodiment of the present invention.
- the start-up system 300 includes a pumping assembly 310 which is connected to the hydraulic fluid supply.
- the pumping assembly 310 supplies high pressure fluid to valve assembly 35.
- valve assembly 35 When the valve assembly 35 is opened the high pressure fluid forces an air that may be entrapped within the system, 30 to be expelled through the passages surround in the master piston assembly 32 and the slave piston assemblies 34.
- a bleeder device 26, described above, may be provided to vent the system 30.
- the system 300 includes a heater assembly 320 to warm the hydraulic fluid within the system 300.
- the heater assembly 320 is preferably an in-line electric heating element. It, however, is contemplated that other heating elements are capable of being used to warm the hydraulic fluid and .are considered to be within the scope of the present invention.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98958102A EP1032752A1 (en) | 1997-11-21 | 1998-11-20 | Method and system start-up apparatus for removing air and debris from a valve actuation system |
JP2000522356A JP2001524634A (en) | 1997-11-21 | 1998-11-20 | Method and system starter for removing air and debris from a valve actuation system |
KR1020007005570A KR20010032344A (en) | 1997-11-21 | 1998-11-20 | Method and system start-up apparatus for removing air and debris from a valve actuation system |
BR9814889-3A BR9814889A (en) | 1997-11-21 | 1998-11-20 | Valve actuation system for actuating at least one valve on an engine during engine operation, starting system for an engine valve actuation set, and process for removing at least one of the air and waste from an actuation set engine valve during engine start operation |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US6670397P | 1997-11-21 | 1997-11-21 | |
US60/066,703 | 1997-11-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999027235A1 true WO1999027235A1 (en) | 1999-06-03 |
Family
ID=22071165
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1998/024832 WO1999027235A1 (en) | 1997-11-21 | 1998-11-20 | Method and system start-up apparatus for removing air and debris from a valve actuation system |
Country Status (6)
Country | Link |
---|---|
US (1) | US6112710A (en) |
EP (1) | EP1032752A1 (en) |
JP (1) | JP2001524634A (en) |
KR (1) | KR20010032344A (en) |
BR (1) | BR9814889A (en) |
WO (1) | WO1999027235A1 (en) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8820276B2 (en) * | 1997-12-11 | 2014-09-02 | Jacobs Vehicle Systems, Inc. | Variable lost motion valve actuator and method |
US6415752B1 (en) * | 1999-09-17 | 2002-07-09 | Diesel Engine Retarders, Inc. | Captive volume accumulator for a lost motion system |
ITTO20010269A1 (en) * | 2001-03-23 | 2002-09-23 | Fiat Ricerche | INTERNAL COMBUSTION ENGINE, WITH HYDRAULIC VARIABLE VALVE OPERATION SYSTEM, AND MEANS OF COMPENSATION OF VOLUME VARIATIONS |
ITTO20010273A1 (en) * | 2001-03-23 | 2002-09-23 | Fiat Ricerche | INTERNAL COMBUSTION ENGINE WITH HYDRAULIC SYSTEM FOR VARIABLE OPERATION OF VALVES AND WITH AIR PURGE MEANS FROM THE IDR SYSTEM |
US6769405B2 (en) | 2002-07-31 | 2004-08-03 | Caterpillar Inc | Engine with high efficiency hydraulic system having variable timing valve actuation |
JP2004197588A (en) * | 2002-12-17 | 2004-07-15 | Mitsubishi Motors Corp | Valve system for internal combustion engine |
US20050000476A1 (en) * | 2003-05-06 | 2005-01-06 | Richard Vanderpoel | System and method for improving performance of hydraulic actuating system |
US7559300B2 (en) * | 2003-12-12 | 2009-07-14 | Jacobs Vehicle Systems, Inc. | Multiple slave piston valve actuation system |
CN100497933C (en) * | 2004-03-05 | 2009-06-10 | 博世株式会社 | Fuel supply device |
US7665432B2 (en) * | 2006-12-12 | 2010-02-23 | Jacobs Vehicle Systems, Inc. | Valve actuation system and method of driving two slave pistons with one master piston |
US11333048B1 (en) * | 2020-12-18 | 2022-05-17 | Caterpillar Inc. | Hydro-mechanical module for engine valve actuation system |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4153016A (en) * | 1977-04-28 | 1979-05-08 | Hausknecht Louis A | Valve control system |
US4231543A (en) * | 1978-06-09 | 1980-11-04 | Maschinenfabrik Augsburg-Nurnberg Aktiengesellschaft | Controllable hydraulic valve mechanism for reciprocating engines or pumps |
US4278233A (en) * | 1978-09-16 | 1981-07-14 | Maschinenfabrik Augsburg-Nurnberg Aktiengesellschaft | Arrangement for actuating gas-change valves |
US4898128A (en) * | 1988-04-07 | 1990-02-06 | Meneely Vincent A | Anti-lash adjuster |
US5152258A (en) * | 1989-12-02 | 1992-10-06 | Man Nutzfahrzeuge Ag | Hydraulic control device for poppet valves of combustion engines |
US5154143A (en) * | 1989-11-25 | 1992-10-13 | Robert Bosch Gmbh | Electrohydraulic valve control device for internal combustion engines |
US5537976A (en) * | 1995-08-08 | 1996-07-23 | Diesel Engine Retarders, Inc. | Four-cycle internal combustion engines with two-cycle compression release braking |
US5809964A (en) * | 1997-02-03 | 1998-09-22 | Diesel Engine Retarders, Inc. | Method and apparatus to accomplish exhaust air recirculation during engine braking and/or exhaust gas recirculation during positive power operation of an internal combustion engine |
US5839453A (en) * | 1995-08-08 | 1998-11-24 | Diesel Engine Retarders, Inc. | Internal combustion engines with combined cam and electro-hydraulic engine valve control |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5857438A (en) * | 1997-03-18 | 1999-01-12 | Barnard; Daniel Wayne | Hydraulically operated variable valve control mechanism |
-
1998
- 1998-11-20 KR KR1020007005570A patent/KR20010032344A/en not_active Application Discontinuation
- 1998-11-20 WO PCT/US1998/024832 patent/WO1999027235A1/en not_active Application Discontinuation
- 1998-11-20 US US09/196,239 patent/US6112710A/en not_active Expired - Fee Related
- 1998-11-20 JP JP2000522356A patent/JP2001524634A/en active Pending
- 1998-11-20 EP EP98958102A patent/EP1032752A1/en not_active Withdrawn
- 1998-11-20 BR BR9814889-3A patent/BR9814889A/en not_active Application Discontinuation
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4153016A (en) * | 1977-04-28 | 1979-05-08 | Hausknecht Louis A | Valve control system |
US4231543A (en) * | 1978-06-09 | 1980-11-04 | Maschinenfabrik Augsburg-Nurnberg Aktiengesellschaft | Controllable hydraulic valve mechanism for reciprocating engines or pumps |
US4278233A (en) * | 1978-09-16 | 1981-07-14 | Maschinenfabrik Augsburg-Nurnberg Aktiengesellschaft | Arrangement for actuating gas-change valves |
US4898128A (en) * | 1988-04-07 | 1990-02-06 | Meneely Vincent A | Anti-lash adjuster |
US5154143A (en) * | 1989-11-25 | 1992-10-13 | Robert Bosch Gmbh | Electrohydraulic valve control device for internal combustion engines |
US5152258A (en) * | 1989-12-02 | 1992-10-06 | Man Nutzfahrzeuge Ag | Hydraulic control device for poppet valves of combustion engines |
US5537976A (en) * | 1995-08-08 | 1996-07-23 | Diesel Engine Retarders, Inc. | Four-cycle internal combustion engines with two-cycle compression release braking |
US5839453A (en) * | 1995-08-08 | 1998-11-24 | Diesel Engine Retarders, Inc. | Internal combustion engines with combined cam and electro-hydraulic engine valve control |
US5809964A (en) * | 1997-02-03 | 1998-09-22 | Diesel Engine Retarders, Inc. | Method and apparatus to accomplish exhaust air recirculation during engine braking and/or exhaust gas recirculation during positive power operation of an internal combustion engine |
Also Published As
Publication number | Publication date |
---|---|
JP2001524634A (en) | 2001-12-04 |
EP1032752A1 (en) | 2000-09-06 |
BR9814889A (en) | 2000-10-03 |
US6112710A (en) | 2000-09-05 |
KR20010032344A (en) | 2001-04-16 |
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