CN102918368B - Fuel system electrostatic potential difference level sensing element and hardware/software architecture - Google Patents
Fuel system electrostatic potential difference level sensing element and hardware/software architecture Download PDFInfo
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- CN102918368B CN102918368B CN201180011352.1A CN201180011352A CN102918368B CN 102918368 B CN102918368 B CN 102918368B CN 201180011352 A CN201180011352 A CN 201180011352A CN 102918368 B CN102918368 B CN 102918368B
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- 239000000446 fuel Substances 0.000 title claims abstract description 70
- 238000005421 electrostatic potential Methods 0.000 title abstract description 5
- 239000007788 liquid Substances 0.000 claims abstract description 41
- 239000003989 dielectric material Substances 0.000 claims abstract description 6
- 239000002828 fuel tank Substances 0.000 claims description 20
- 238000001514 detection method Methods 0.000 claims description 11
- 239000000758 substrate Substances 0.000 claims description 10
- 230000005611 electricity Effects 0.000 claims description 6
- 230000000875 corresponding Effects 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 238000002955 isolation Methods 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 abstract description 5
- 238000005755 formation reaction Methods 0.000 abstract description 5
- 230000002708 enhancing Effects 0.000 abstract description 2
- 239000003990 capacitor Substances 0.000 description 12
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000003139 buffering Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 230000005283 ground state Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001953 sensory Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
The present invention relates to the sensing element in a kind of fuel system, particularly relate to a kind of in fuel system for measuring the electrostatic potential difference level sensing element of fuel level and fuel type.Sensing element includes two pieces of battery lead plates being arranged on a dielectric material and be fixed to a barricade.This sensing element is extruded one three-dimensional sensing element (coil such as spiraled) of formation, and this three-dimensional sensing element has the capacitance detecting ability of enhancing, to measure fuel type and liquid level.
Description
Technical field
The present invention relates generally to the liquid level sensor in fuel system, particularly relate to one in fuel system for measuring
The electrostatic potential difference level sensing element of fuel.
Background technology
Typical fuel system of automobile includes the fuel delivery system being arranged in fuel tank, and this fuel delivery system includes using
In the reservoir being accommodated fuel by fuel tank.It is arranged on the petrolift within reservoir from reservoir, extracts fuel it is defeated
Deliver to an internal combustion engine.When extracting fuel from reservoir, fuel detection device is by remaining in sensor measurement fuel tank
The liquid level of fuel.Level gauging mechanism such as includes float arm mechanism, pressure transducer, capacitance sensor and supersonic sensing
Device.
Float arm mechanism needs the movable part being arranged within reservoir, requires time for installing, and it is possible to can produce
The raw contact problems causing mistake to be measured.Generally, the float interacted with circuit is pivotally mounted to fuel level assembly,
This fuel level assembly interacts with circuit, with the liquid level of fuel in the floating position measurement fuel tank according to float.
Capacitance sensor uses a capacitor to be used for measuring, and uses another capacitor for reference.For measuring
Capacitor be usually more than the whole height of fuel tank, and its capacitance changes according to the liquid level of the fuel in fuel tank.Reference
Capacitor is immersed in fuel for a long time, and provides the reference value of the dielectric constant of fuel.Electronic circuit determines fuel tank fuel
Liquid level.Capacitor can be flat or cylindrical plate, and fuel can decline between the plates and rise, thus affects its electricity
Capacity.These sensors can also use the interdigital electrode form interacted by interference effect to exist.
U.S. Patent number 5,001,596 disclose the capacitor for liquid level sensor, and this liquid level sensor has elongated
Extendible capacitor plate, the spaced installation of these capacitor plates, be used for measuring represent liquid in containers to be formed
The capacitor of data.These capacitor plates can constantly extend to adapt to any change of container shapes.
US publication 2007/0240506 discloses the sensory package of a kind of liquid level sensed in reservoir.One excitation electricity
Road electrically connects with the first port and the second port, for receiving voltage signal and producing excitation signal.One receives circuit is arranged
In the position of neighbouring field circuit, and define one with the variable electric capacity of field circuit.This reception circuit produces an output electricity
Pressure, owing to liquid makes electrolyte there occurs change, therefore field circuit and the capacitance received between circuit change, and make this whereby
Output voltage changes along with the liquid level in reservoir.
Summary of the invention
The present invention relates to the sensing element in a kind of fuel system, particularly relate to one in fuel system for measuring combustion
The electrostatic potential difference level sensing element of feed liquid position and fuel type.Sensing element includes that two pieces are arranged on a dielectric material also
It is fixed to the battery lead plate of a barricade.This sensing element is extruded one three-dimensional sensing element (coil such as spiraled) of formation,
This three-dimensional sensing element has the capacitance detecting ability of enhancing, to measure fuel type and liquid level.
In one embodiment of the invention, there is a kind of capacitance sensing element, it includes that at least two pieces spaced set
Put and be connected to the elongated board of a dielectric material, and be coupled to the capacity cell of these at least two pieces of elongated boards, thus constitute one
Individual electric capacity, wherein, the dielectric constant that capacity cell is measured changes along with liquid and the change of air dielectric, and this capacitance sensing
Element can extend and shrink.
In one aspect of the invention, these at least two pieces of elongated boards are extruded the expansible and contractile substantially dish of formation
The shape of rotation, thus change the height of capacitance sensing element.
In another aspect of the present invention, these at least two pieces of elongated boards are extruded on the material of a spring-like, with
Form the most helical expansible and contractile shape, thus change the height of capacitance sensing element.
In the yet other aspects of the present invention, these at least two pieces of elongated boards interlock, expansible and can receive to form one
The element of contracting.
In the yet other aspects of the present invention, the dielectric constant recorded corresponds to liquid level or kind of liquid.
In another aspect of the present invention, this sensing element to special IC (ASIC) export one with record
The capacitance that dielectric constant is corresponding, capacitance is converted to voltage by this special IC, and then this voltage is output to monolithic
Machine, this single-chip microcomputer will change the impedance of output circuit, and shows result on a display.
In the yet other aspects of the present invention, this liquid is the fuel for vehicle, and this capacitance sensor is suitable for
In extension and the different shape and size of the fuel tank being shrunk to preservation fuel.
In another embodiment of the present invention, exist and a kind of use capacitance sensing element to measure the side of liquid in reservoir
Method, comprising: by least two pieces of spaced settings of elongated board, and it is connected to a dielectric material, then that a capacity cell is even
Being coupled to this at least two pieces of elongated boards, thus constitute an electric capacity, wherein, the dielectric constant that capacity cell is measured is along with liquid and air
The change of medium and change, and this capacitance sensing element can extend and shrink.
In one aspect of the invention, to farther include to extrude these at least two pieces of elongated boards expansible to be formed for the method
With the contractile shape substantially spiraled, thus change the height of capacitance sensing element.
In another aspect of the present invention, the method farther includes to extrude these at least two pieces of elongated boards and is similar to bullet to one
On the material of spring, to form the most helical expansible and contractile shape, thus change the height of capacitance sensing element
Degree.
In the yet other aspects of the present invention, the method includes making these at least two pieces of elongated boards interlock, to form one
Expansible and contractile element.
In the yet other aspects of the present invention, the dielectric constant recorded corresponds to liquid level or kind of liquid.
In another aspect of the present invention, the method farther includes to export one to a special IC (ASIC)
The capacitance that dielectric constant that is individual and that record is corresponding, capacitance is converted to voltage by this special IC, then by this voltage
Exporting to single-chip microcomputer, this single-chip microcomputer will change the liquid level impedance of output circuit, and shows result on a display.
In the yet other aspects of the present invention, this liquid is the fuel for vehicle, and this capacitance sensor is suitable for
In extension and the different shape and size of the fuel tank being shrunk to preservation fuel.
Accompanying drawing explanation
In conjunction with the preferred embodiment being described in detail below, most preferred embodiment, claims and accompanying drawing, the present invention's
These and other aspect, characteristic and advantage will be more clearly understood, wherein:
Figure 1A shows the sectional view of the sensing element according to the present invention；
Figure 1B shows the exploded view of the sectional plane of the sensing element in Figure 1A；
Fig. 2 shows the sensing element coil sides view with variable height according to the present invention；
Fig. 3 shows the sectional view of the sensing element coil of Fig. 2；
Fig. 4 shows the system structure with sensing element according to the present invention；
Fig. 5 shows the circuit theory diagrams of the sensing element of the embodiment according to Fig. 4；
Fig. 6 illustrates voltage output and the capacitance of three kinds of discrete frequencies of employing as known in the art；
Fig. 7 illustrates the exemplary embodiments of the sensing element in zigzag of the present invention；
Fig. 8 illustrates the exemplary embodiments of the serpentine-like sensing element of the present invention.
Detailed description of the invention
Figure 1A shows the typical sensor element according to the present invention.Sensing element described herein is used for measuring sensed
The liquid level of liquid and/or determine the type of sensed liquid.Such as, in automotive environment, it is possible to use sensing element is surveyed
The liquid level of the fuel in amount fuel tank, it is also possible to determine that what type the fuel in fuel tank is.Refer to Figure 1A, in more detail
Describe sensing element 105.In this typical embodiment, sensing element 105 has two be extruded on substrate SBST
Electrode E1 and E2, this substrate SBST are arranged on barricade SH2, and this barricade SH2 can be used as the reference plane fixed.Figure 1A shows
Having gone out the section AA of extruded sensing element 105, this will be easy to understand in the following description.
Figure 1B shows the exploded view of the sensing element in Figure 1A.In this exploded view, it is shown that with barricade SH2's
Two electrode plate E1 and E2.As this area, content is intelligible, and capacitor C2 connects electrode E1 and E2, and capacitor C1
Respectively electrode E1 and E2 is connected to barricade SH2 with C3.Capacitance can pass through dielectric constant K1, K2 and K3, battery lead plate E1
With distance D between the area of E2 and plate E1 and E2 weighs, their functional relationship can be expressed as:
Wherein: ko is the dielectric constant of test liquid, kr is the dielectric constant of substrate, and pi is pi, and w is wire (trace)
Width, and d is the distance between two wires.
It is understood, however, that the battery lead plate of more than two pieces may be used for producing enough areas, to realize electric capacity sense
Should.In the embodiment shown, one piece of plate E1 can be used as passive circuit (), and another block plate E2 to can be used as active circuitry (logical
Cross a sinusoidal wave triggering pulse, not shown).This Active plate will be inducted in passive plate according to dielectric constant (fuel or air)
One is sinusoidal wave.This two boards (or multiple staggered plate) is arranged side by side.The encapsulation of these plates can protect these plates to exempt from abrasion
Or damage, it is also possible to improve the rigidity of its structure.
Fig. 2 show according to one embodiment of present invention in sensing element.As it can be seen, in this embodiment,
This sensing element 105 three-dimensional in alterable height is spiraled or helical coil shape.It is understood, however, that spiral or spiral
Shape is typical shape, it is also possible to use various different style or shape.Its style and shape are for producing enough tables
Area, to strengthen capacitive sensing.The top of this sensing element 105 and bottom can be mechanically attached to be arranged on the reservoir of vehicle
Or the fuel pump components in container.Or, this sensing element 105 can be installed to a support, and this support is as being arranged on storage
Self-contained unit within liquid device.
One circuit board (PCB) is installed at the top of shown sensing element 105, is hereafter explained.Although PCB
It is installed in the top of sensing element 105, but this PCB can also be arranged on any position away from sensing element 105 of vehicle
Put.Although these equipment are possible to prevent fuel to adsorb, but inevitably, after certain time, they can
Adsorb some fuel.In order to minimize this absorption, this PCB the most so installs: this PCB is minimally immersed in fuel
In.It is therefore preferable that be installed in the top of sensing element 105, to prevent fuel from adsorbing, and also can be that this sensor carries
For circuit and immediate position.Dielectric constant for determining fuel tank fuel it is provided with in the bottom of sensing element 105
Correction/detection sensing element 107, it further illustrates hereinafter in conjunction with reference to accompanying drawing 3.
The difference of the sensing element 105 dielectric constant by being produced by air/fuel steam relative liquid fuel detects
Accommodate the fuel level in the reservoir of fuel.As shown in the section AA in Fig. 2, in the present embodiment, this sensing element 105 is
Spiraled or the coil of spiral by what one or more staggered battery lead plates and barricade SH2 formed.Jie due to fuel
Electric constant the lowest (low), the biggest tablet area, accurately to measure.On this point, in order to increase it
Surface area, can use three-dimensional sensing element coil to design, and this element can be compressed or extend, to be suitable for different design and several
What structure, such as, is suitable for the size and dimension of fuel tank.Owing to traditional sensing element is difficult to reconstruct to be suitable for various design
And structure, therefore, above-mentioned this element has superiority.
As it is shown on figure 3, be positioned at the correction being made up of plate E6 and the E7/detection sensing element of the bottom of sensing element 105
107.This correction/detection sensing element 107 determines the dielectric constant of fuel tank fuel.Although this school in the embodiment shown
Just/detection sensing element 107 is arranged on the bottom of sensing element 105, but it can also be placed on the position of a far-end.
Or, an element with the dielectric constant of precorrection can be used to replace element 107.
Fig. 3 shows the cross section BB of correction/detection sensing element 107, and it has one and accommodates for wherein
The opening of fuel.The dielectric radio detected by this correction/detection sensing element 107 by single-chip microcomputer (μ C) 115 is different from corresponding
The data base of the fuel dielectric constant of fuel type compares.By this method, single-chip microcomputer 115 may determine that in fuel tank
Fuel is any type and/or whether fuel may be contaminated.Owing to being aware of the type of fuel, therefore, based on used
Fuel, the car-mounted computer of vehicle can utilize the information to adjust the fuel/air mixture in combustion phases.Such as,
Different from high-rank fuel for the fuel air mixture of fuel flexible (flex fuels).So there is no need at its of vehicle
The sensing device that its local use is more expensive.Similarly, this correction/detection sensing element 107 may be used for sensing in fuel tank
Water or pollutant, this is because the dielectric radio of both materials is significantly different with the dielectric radio of fuel.Therefore, this vehicle computing
Machine can remind driver to there are pollutant in vehicle fuel tank.
Fig. 4 shows the system structure with sensing element according to the present invention.As shown in Figure 4, overall system 100 wraps
Include: sensing element 105, ASIC 110(are although it is understood that be the ASIC that can use any compatibility, but are ready-made in this example
FreescaleTMASIC MC33941 electric field imaging equipment), single-chip microcomputer 115(is such as by the micro-core of the U.S.TM, FreescaleTMOr moral
State instrumentTMThe single-chip microcomputer manufactured), for controlling ground state the circuit 120 being connected with single-chip microcomputer and the fuel gage 125 of automobile.
At work, this ASIC receives the information that sensing element 105 detects, and the capacitance that this sensor produces is converted into correspondence
The output voltage of ratio.This output voltage is transported to single-chip microcomputer, and this single-chip microcomputer changes the impedance of output circuit to meet vehicle
Requirement, then by the impedance display of this change on the fuel gage of automobile.
Fig. 5 shows the schematic diagram of the sensing element of the embodiment according to Fig. 4.It is different from traditional fuel liquid level sensor,
This traditional fuel liquid level sensor needs a rheostat being connected to the float being positioned in fuel tank, and the present invention has one
Individual need not any movable part and can control the solid-state circuit of resistive path ground connection.Control this solid-state circuit of resistive path by list
Sheet machine 115 controls.As shown in Figure 6, single-chip microcomputer 115 receives circuit (in this example for ASIC 110, it produces and becomes to compare with capacitance
The voltage output of example) analog input signal that exports.Output can pass through a discrete electric to ASIC 110 fundamental frequency of electrode E1
Resistance device selects.Sensing element 105 is by being calculated width and two elements of spacing or wire (trace) forms.A piece wire (electricity
Pole E1) as sending wire, and another root wire (electrode E2) is as receptor or detector, both is in ASIC 110
Portion's ground connection.In typical work process, when ASIC 110 produces one on electrode E1, there is approximation 5.0V peak-to-peak amplitude
During low radio frequency sine wave, produce a corresponding ripple reduced by contrast on electrode E2 receiving.This ripple received leads to subsequently
Cross ASIC 110 to amplify, then analog output voltage proportional for correspondence is exported to single-chip microcomputer 115.Electrode E2 surveys
The voltage inducted of amount is as the inverse function of capacitance between electrode E1 and E2.Capacitance increases the output electricity causing ASIC 110
Pressure reduces.Comprising barricade SH2 is to make the electrode signal along connecting line minimize, and the circuit in ASIC 110
Provide the buffering signals of the AC signal returned from electrode E2.Owing to the buffering signals of this AC signal has and electrode signal
Almost identical amplitude and phase place, therefore, almost without potential difference between the two signal, thus eliminate any electric field.Actual
On, electrode signal and external noise are isolated by this barricade SH2.This barricade SH2 can be connected to for connecting electrode E1
With the coaxial cable of E2, and the ground plane used at electrode E1 and the E2 back side can also be connected to, exchange can be made with elimination
Any noise of signal attenuation.
Fig. 7 and 8 shows the different embodiments of the sensing element according to the present invention.In the figure 7, sensing element 105 is squeezed
Swaging becomes zigzag shape or pattern.In fig. 8, sensing element 105 is extruded formation serpentine shaped or pattern.It is easily understood that
The present invention is not limited to these examples, and this sensing element can be extruded formation any shape well known in the art or pattern.
Obviously, in view of above-mentioned teaching, the present invention can have multiple amendment and deformation.It should therefore be understood that in appended right
In the range of requirement, the present invention can by specific descriptions by the way of beyond alternate manner realize.
Claims (6)
1. a capacitance sensing element, it is characterised in that this element includes:
At least two is mutually transverse spaced and longitudinal extension is also between the opposite end of described capacitance sensing element
Being connected to the slender electrode plate of dielectric material, each described slender electrode plate is expansible and contractile and twist；
Substrate, it encapsulates described at least two slender electrode plate, with by mutually isolated for this at least two slender electrode plate and should
At least two slender electrode plate and the isolation of their external environment condition, this substrate is expansible and contractile spring-like material, with
Change the height of described capacitance sensing element；
And the barricade of capacity coupled elongated conductive parallel with described at least two slender electrode plate, it is by described substrate package
And separated with each described slender electrode plate by this substrate；And
Correction detection sensing element, it has one for accommodating the opening of the liquid treating that described capacitance sensing element measures, and uses
In the dielectric constant determining this liquid.
2. the system with capacitance sensing element according to claim 1, it is characterised in that this system is wrapped further
Include special IC, its with described at least two slender electrode plate electric connection to receive the signal corresponding with liquid level, and should
Signal is converted to voltage, and this system farther includes single-chip microcomputer, and itself and described special IC electric connection are to receive institute
State voltage, and change the impedance of output circuit, to show result over the display.
System the most according to claim 2, it is characterised in that this liquid is the fuel for vehicle, and each described carefully
Long electrode plate is adapted to extension and is shrunk to preserve the different shape and size of the fuel tank of fuel.
4. one kind utilizes capacitance sensing element to measure the method for liquid in reservoir, it is characterised in that the method includes:
Arrange at least two spaced and between the opposite end of described capacitance sensing element longitudinal extension and be connected to
The slender electrode plate of dielectric material, each described slender electrode plate is expansible and contractile and twist；
This at least two slender electrode plate is encapsulated in a substrate, with by mutually isolated for this at least two slender electrode plate and should
At least two slender electrode plate and their external environment condition are isolated, and this substrate is expansible and contractile spring-like material,
To change the height of described capacitance sensing element；
The barricade of parallel with described at least two slender electrode plate and capacity coupled elongated conductive is set, by described substrate
Encapsulate this barricade and make it isolate with each described slender electrode plate；And
Arranging correction detection sensing element, this correction detection sensing element has one and treats that described capacitance sensing element is surveyed for receiving
The opening of the liquid of amount, and for determining the dielectric constant of this liquid.
Method the most according to claim 4, it is characterised in that the method further includes steps of
Comprise the signal of capacitance to special IC output from described capacitance sensing element；
Capacitance in this signal is converted to voltage；
This voltage is exported to single-chip microcomputer；
This single-chip microcomputer changes the impedance of output circuit；And
Show result over the display.
Method the most according to claim 4, it is characterised in that this liquid is the fuel for vehicle, and each elongated electricity
Pole plate is adapted to extension and is shrunk to preserve the different shape and size of the fuel tank of fuel.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US12/683,974 US8549910B2 (en) | 2010-01-07 | 2010-01-07 | Fuel system electro-static potential differential level sensor element and hardware/software configuration |
| US12/683,974 | 2010-01-07 | ||
| PCT/US2011/020087 WO2011084940A2 (en) | 2010-01-07 | 2011-01-04 | Fuel system electro-static potential differential level sensor element and hardware/software configuration |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102918368A CN102918368A (en) | 2013-02-06 |
| CN102918368B true CN102918368B (en) | 2016-11-30 |
Family
ID=
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3343415A (en) * | 1964-06-04 | 1967-09-26 | Rosemount Eng Co Ltd | Fluid level sensors |
| US4428232A (en) * | 1980-11-20 | 1984-01-31 | Nippon Soken, Inc. | Capacitance liquid level detector |
| US5001596A (en) * | 1990-05-07 | 1991-03-19 | Therm-O-Disc, Incorporated | Capacitive fluid level sensor |
| US5437184A (en) * | 1993-10-27 | 1995-08-01 | Kdi/Triangle Electronics, Inc. | Capacitive liquid level sensor having phase detecting circuitry |
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3343415A (en) * | 1964-06-04 | 1967-09-26 | Rosemount Eng Co Ltd | Fluid level sensors |
| US4428232A (en) * | 1980-11-20 | 1984-01-31 | Nippon Soken, Inc. | Capacitance liquid level detector |
| US5001596A (en) * | 1990-05-07 | 1991-03-19 | Therm-O-Disc, Incorporated | Capacitive fluid level sensor |
| US5437184A (en) * | 1993-10-27 | 1995-08-01 | Kdi/Triangle Electronics, Inc. | Capacitive liquid level sensor having phase detecting circuitry |
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| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20150724 Address after: 5110 Suites Cleveland 127 public square, Ohio, USA 44114 Applicant after: CARTER FUEL SYSTEMS LLC Address before: Michigan state highway 26555 northwest of Southfield Applicant before: Federal Mogul Corp. |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161130 Termination date: 20180104 |