CN203163821U - Parallel plate multi-electrode capacitance type oil level sensor - Google Patents
Parallel plate multi-electrode capacitance type oil level sensor Download PDFInfo
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- CN203163821U CN203163821U CN 201220684823 CN201220684823U CN203163821U CN 203163821 U CN203163821 U CN 203163821U CN 201220684823 CN201220684823 CN 201220684823 CN 201220684823 U CN201220684823 U CN 201220684823U CN 203163821 U CN203163821 U CN 203163821U
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Abstract
The utility model relates to a parallel plate multi-electrode capacitance type oil level sensor. The sensor comprises a multi-electrode plate and a public electrode plate, wherein the upper part of the multi-electrode plate and the upper end of the public electrode plate are inserted into a protection box; a control circuit is arranged at the upper part of the multi-electrode plate and comprises a power supply circuit, a data acquisition and processing circuit and a signal output circuit; the power supply circuit is connected with a +12 V power supply, and a signal output circuit is connected with an input end of an oil gauge; at least five measuring electrodes and a reference electrode are arranged at the middle part and the lower part of the multi-electrode plate, and the measuring electrodes and the reference electrode are connected with the data acquisition and processing circuit of the control circuit respectively; and a public electrode is arranged on the public electrode plate and is connected with the data acquisition and processing circuit of the control circuit. The parallel plate multi-electrode capacitance type oil level sensor provided by the utility model can prevent dielectric constants of an oil dielectric from being affected by the temperature, accurately reflect remnant oil quantity in a fuel tank, and is high in measuring accuracy and stable and reliable in operation.
Description
Technical field
The utility model relates to sensor, is specifically related to a kind of parallel-plate multielectrode capacitance formula fuel level sensor for automobile, motorcycle, multielectrode capacitance formula fuel level sensor.
Technical background
Fuel level sensor is installed in the fuel tank of automobile, motorcycle, gathers the elevation information of pasta in the fuel tank, and via controller is transferred to oil meter after handling, remaining oil mass in the indication fuel tank.At present, the fuel level sensor that most of automobiles use is float-type power transformation resistance sensor, though simple in structure, low precision, reliability is low, and serviceable life is short, the oil mass in the mensuration fuel tank of vehicle that can not be definite.In order to overcome the shortcoming of traditional oils level sensor, the automobile that has has adopted the condenser type fuel level sensor, can be divided into coaxial capacitance fuel level sensor, parallel plate capacitor fuel level sensor and veneer comb capacitance fuel level sensor by the structure of capacitance electrode.In use all there are some indeterminable problems in the condenser type fuel level sensor of these several structures.As coaxial electric capacity fuel level sensor, owing to be in the space of relative closure between two capacitor plates, will deposit impurity at two-plate after use a period of time, the precision that influence is measured; The electrode of parallel plate capacitor fuel level sensor and veneer comb capacitance fuel level sensor is owing to be open type, can be subjected to washing away of oil plant in the fuel tank in use, can not deposit impurity on the pole plate, but veneer comb capacitance fuel level sensor in use, being in pasta divides the electrode surface on interface top can adhere to the last layer oil reservoir, because distance between electrodes is very little, the oil reservoir that adheres to will significantly change capacitance, causes measuring error.Different with the occupied ratio of oil plant medium to produce capacitance different because the condenser type fuel level sensor is according to air dielectric between capacitor plate, but the specific inductive capacity of oil plant medium is subjected to Temperature Influence, no matter be the coaxial capacitance fuel level sensor, parallel plate capacitor fuel level sensor or veneer comb capacitance fuel level sensor are influenced by this all can.Therefore, be necessary to explore a kind of new technical scheme, solve above problem.
Summary of the invention
The purpose of this utility model provides a kind of parallel-plate multielectrode capacitance formula fuel level sensor, and it can avoid the specific inductive capacity of oil plant medium to be subjected to Temperature Influence, remaining oil mass in the accurate response fuel tank, and measuring accuracy height, working stability are reliable; Processing and manufacturing simple in structure, in light weight, easy.
A kind of parallel-plate multielectrode capacitance formula fuel level sensor described in the utility model; comprise multi-electrode plate, the common electrical pole plate corresponding with the middle part of this multi-electrode plate and bottom; described common electrical pole plate is connected on the multi-electrode plate also in parallel by many fixed legs; insert in the protection box in the lump the upper end of the top of described multi-electrode plate and described common electrical pole plate; and use epoxy sealing, it is characterized in that:
The top of described multi-electrode plate is provided with control circuit, and this control circuit comprises power circuit, data acquisition and treatment circuit and signal output apparatus; Power circuit is connected with+12V power supply, and signal output apparatus is connected with the input end of oil meter;
At least be provided with five potential electrode and a reference electrode on the middle part of described multi-electrode plate and the bottom, described potential electrode is connected with data acquisition and the treatment circuit of described control circuit respectively with reference electrode;
Described common electrical pole plate is provided with a public electrode, and this public electrode is connected with data acquisition and the treatment circuit of described control circuit.
The utility model has increased a reference electrode on traditional capacitance level transducer basis, can reduce the oil plant of different types of oil plant or different qualities because of the different measuring error that cause of specific inductive capacity.
Described a kind of parallel-plate multielectrode capacitance formula fuel level sensor, the distance between its described multi-electrode plate and the described common electrical pole plate is 1mm ~ 1.5mm.Because all there is surface tension in liquid, when two parallel plate capacitor spacings hour, the parallel-plate spacing between parallel-plate, can have capillarity, so should be tried one's best greatly, but consider that the spacing increase can make capacitance diminish, distributed capacitance and edge effect meeting influence measure precision and stability, by experiment, spacing can be taken into account the contradiction aspect two between 1mm ~ 1.5mm the time, actual value is 1.2mm, can obtain measurement effect preferably.
Further; described power circuit comprises unidirectional protection diode D1, three terminal regulator IC1, storage capacitor C11, divider resistance R1 and R2, charging current limiter resistance R 3, work current-limiting resistance R4, and the 12V supply voltage provides power-off signal to data acquisition and treatment circuit after divider resistance R1, R2 dividing potential drop.It is to data acquisition and treatment circuit and signal output apparatus power supply that power circuit mainly acts on, and can continue in 30 minutes after primary power source de-energizes other partial circuit power supplies.
Further, described a kind of parallel-plate multielectrode capacitance formula fuel level sensor, it is characterized in that: described data acquisition and treatment circuit comprise the data that single-chip microcomputer IC2, C0 reference capacitance, C0, potential electrode C1-C10, single-chip microcomputer IC2 gather C0-C10, after treatment by I/O port (the 21st pin is to 28 pin) output control signal; 12 pin of single-chip microcomputer IC2 are connected with 3 pin of the three terminal regulator IC1 of power circuit.Data acquisition and treatment circuit receive the pole plate capacitance signal by single-chip microcomputer, and corresponding oil level signal is calculated and handled.Automobile in the process of moving, pasta can be different with travel conditions and different along with pavement behavior, the oil level value that record this moment is different with the oil level value that is still in the surface level state, data acquisition of the present utility model and treatment circuit carry out filtering to the data of this moment to be handled, and filtering departs from the data of normal value.
Further, described signal output apparatus comprises field effect transistor Q1-Q8, output resistance R5-R12, filter capacitor C14, and the grid of Q1-Q8 wherein receives the control signal of single-chip microcomputer IC2.Signal output apparatus is then exported the resistance signal of Displaying Meter needs to the MCU of Displaying Meter with the liquid level signal by different array modes and different dutycycles.
The utility model is by the different height of monitoring oil level of parallel plate capacitor capacitance in fluid and air, adopt multipole plate parallel capacitance structure can effectively reduce owing to temperature variation causes the measuring error that the fluid change in dielectric constant causes, such as the relative dielectric constant temperature coefficient of gasoline be-0.067%/℃, if adopt the unipolar plate capacitance measurement, during temperature variation ± 30 ℃, measuring error is 4.02%, if adopt multipole plate capacitance measurement (such as 10 pole plates), measuring error will be reduced to 0.402%, reality has adopted 10 pole plates, need not carry out temperature compensation and just can carry out high-precision measurement, reduce the complicacy of testing circuit and the cost of material.
Described a kind of parallel-plate multielectrode capacitance formula fuel level sensor in use common and oil pump assy is installed together, with the oil pump common source, if automobile energising but not during engine on, power supply is only powered about about 3 seconds to oil pump, outage then, in at this moment, the storage capacitor of this sensor internal is full of fast.After the outage, send a power-off signal by power failure detection circuit to single-chip microcomputer, make single-chip microcomputer enter the low power operation pattern, and keep output signal constant.This sensor can keep output signal 30 minutes after outage.
The segment signal output of described a kind of parallel-plate multielectrode capacitance formula fuel level sensor is by different array modes and duty cut-offfing and the output resistance signal of controlling filed effect pipe recently, can directly measure output resistance with ohmmeter, avoid adopting the artifical resistance way of output and must detect with the automobile instrument of correspondence.Production debugging and the on-the-spot test of different model sensor have been made things convenient for.
Description of drawings
Fig. 1 is outside drawing of the present utility model;
Fig. 2 is the right view of Fig. 1;
Fig. 3 is the synoptic diagram of common electrical pole plate;
Fig. 4 is the synoptic diagram of multi-electrode plate;
Fig. 5 is power circuit diagram;
Fig. 6 is data acquisition and treatment circuit figure;
Fig. 7 is signal output apparatus figure;
Fig. 8 is software flow pattern.
Among the figure: 1-protects box, 2-fixed leg, many battery lead plates of 3-, 4-common electrical pole plate, 5-public electrode, 6-control circuit, 7-potential electrode, 8-reference electrode.
Embodiment
Below in conjunction with drawings and Examples the utility model is further described.
Embodiment one: referring to Fig. 1, Fig. 2, Fig. 3 and Fig. 4, a kind of parallel-plate multielectrode capacitance formula fuel level sensor, comprise multi-electrode plate 3, the common electrical pole plate 4 corresponding with the middle part of this multi-electrode plate and bottom, described common electrical pole plate is connected on the multi-electrode plate 3 also in parallel by many fixed legs 2, the distance between multi-electrode plate and the common electrical pole plate is 1mm; Insert in the protection box 1 in the lump the upper end of the top of described multi-electrode plate 3 and described common electrical pole plate 4, and use epoxy sealing, and data acquisition and data processing circuit and signal output apparatus and oil plant are isolated, and avoids being polluted and damaging.
The top of described multi-electrode plate 3 is provided with control circuit 6, and this control circuit comprises power circuit, data acquisition and treatment circuit and signal output apparatus; Power circuit is connected with+12V power supply, and signal output apparatus is connected with the input end of oil meter;
The middle part of described multi-electrode plate 3 and bottom are provided with five potential electrode 7 and a reference electrode 8, and described potential electrode 7 is connected with data acquisition and the treatment circuit of described control circuit 6 respectively with reference electrode 8;
Described common electrical pole plate 4 is provided with a public electrode 5, and this public electrode is connected with data acquisition and the treatment circuit of described control circuit 6.
Embodiment two: referring to Fig. 1, Fig. 2, Fig. 3 and Fig. 4, a kind of parallel-plate multielectrode capacitance formula fuel level sensor, comprise multi-electrode plate 3, the common electrical pole plate 4 corresponding with the middle part of this multi-electrode plate and bottom, described common electrical pole plate is connected on the multi-electrode plate 3 also in parallel by many fixed legs 2, the distance between multi-electrode plate and the common electrical pole plate is 1.3mm; Insert in the protection box 1 in the lump the upper end of the top of described multi-electrode plate 3 and described common electrical pole plate 4, and use epoxy sealing, and data acquisition and data processing circuit and signal output apparatus and oil plant are isolated, and avoids being polluted and damaging.
The top of described multi-electrode plate 3 is provided with control circuit 6, and this control circuit comprises power circuit, data acquisition and treatment circuit and signal output apparatus; Power circuit is connected with+12V power supply, and signal output apparatus is connected with the input end of oil meter;
The middle part of described multi-electrode plate 3 and bottom are provided with ten potential electrode 7 and a reference electrode 8, and described potential electrode 7 is connected with data acquisition and the treatment circuit of described control circuit 6 respectively with reference electrode 8;
Described common electrical pole plate 4 is provided with a public electrode 5, and this public electrode is connected with data acquisition and the treatment circuit of described control circuit 6.
Embodiment three: referring to Fig. 1, Fig. 2, Fig. 3 and Fig. 4, a kind of parallel-plate multielectrode capacitance formula fuel level sensor, comprise multi-electrode plate 3, the common electrical pole plate 4 corresponding with the middle part of this multi-electrode plate and bottom, described common electrical pole plate is connected on the multi-electrode plate 3 also in parallel by many fixed legs 2, the distance between multi-electrode plate and the common electrical pole plate is 1.5mm; Insert in the protection box 1 in the lump the upper end of the top of described multi-electrode plate 3 and described common electrical pole plate 4, and use epoxy sealing, and data acquisition and data processing circuit and signal output apparatus and oil plant are isolated, and avoids being polluted and damaging.
The top of described multi-electrode plate 3 is provided with control circuit 6, and this control circuit comprises power circuit, data acquisition and treatment circuit and signal output apparatus; Power circuit is connected with+12V power supply, and signal output apparatus is connected with the input end of oil meter;
The middle part of described multi-electrode plate 3 and bottom are provided with eight potential electrode 7 and a reference electrode 8, and described potential electrode 7 is connected with data acquisition and the treatment circuit of described control circuit 6 respectively with reference electrode 8;
Described common electrical pole plate 4 is provided with a public electrode 5, and this public electrode is connected with data acquisition and the treatment circuit of described control circuit 6.
Referring to Fig. 5; described power circuit comprises unidirectional protection diode D1, three terminal regulator IC1, storage capacitor C11, divider resistance R1 and R2, charging current limiter resistance R 3, work current-limiting resistance R4, and the 12V supply voltage provides power-off signal to data acquisition and treatment circuit after divider resistance R1, R2 dividing potential drop.
Referring to Fig. 6, described data acquisition and treatment circuit comprise the data that single-chip microcomputer IC2, C0 reference capacitance, C0, potential electrode C1-C10, single-chip microcomputer IC2 gather C0-C10, after treatment by I/O port (the 21st pin is to 28 pin) output control signal; 12 pin of single-chip microcomputer IC2 are connected with 3 pin of the three terminal regulator IC1 of power circuit, as receiving power-off signal, are converted to the low power operation pattern in the course of the work, reduce the power consumption of entire circuit.
Referring to Fig. 7, described signal output apparatus comprises field effect transistor Q1-Q8, output resistance R5-R12, filter capacitor C14, the grid of Q1-Q8 wherein receives the control signal (the 21st pin is to 28 pin) of single-chip microcomputer IC2, by different combinations and dutycycle, cut-off corresponding output resistance R5-R12, after filter capacitor C14 filtering, the corresponding resistance signal of output between OUT and GND, and be transferred to oil meter, indicate remaining oil mass in the fuel tank.
Referring to Fig. 8, after single-chip microcomputer powers on, at first carry out the initialization setting, gather the parameter of reference electrode then, calculate the specific inductive capacity of the oil plant of surveying thus, read the calibrating parameters among the EEPROM, and the specific inductive capacity numerical value correction calibrating parameters that records according to reference electrode.Touring each potential electrode that detects is carried out filtering to detected value and is handled, and filtering departs from the data of normal value, go out the height of oil level according to filtered data computation, export control signal by 21 pin of single-chip microcomputer to 28 pin again, make the corresponding resistance of signal output apparatus output, give instrument and show.If detect the not outage of oil pump power supply, then turn back to touring each potential electrode step that detects, if detect the oil pump power cut-off, then keep present output state, and make single-chip microcomputer enter the low power operation pattern.
Claims (5)
1. parallel-plate multielectrode capacitance formula fuel level sensor; comprise multi-electrode plate (3), the common electrical pole plate (4) corresponding with the middle part of this multi-electrode plate and bottom; described common electrical pole plate is connected multi-electrode plate (3) by many fixed legs (2) and goes up also in parallel; insert in the protection box (1) in the lump the upper end of the top of described multi-electrode plate (3) and described common electrical pole plate (4); and use epoxy sealing, it is characterized in that:
The top of described multi-electrode plate (3) is provided with control circuit (6), and this control circuit comprises power circuit, data acquisition and treatment circuit and signal output apparatus; Power circuit is connected with+12V power supply, and signal output apparatus is connected with the input end of oil meter;
At least be provided with five potential electrode (7) and a reference electrode (8) on the middle part of described multi-electrode plate (3) and the bottom, described potential electrode (7) is connected with data acquisition and the treatment circuit of described control circuit (6) respectively with reference electrode (8);
Described common electrical pole plate (4) is provided with a public electrode (5), and this public electrode is connected with data acquisition and the treatment circuit of described control circuit (6).
2. a kind of parallel-plate multielectrode capacitance formula fuel level sensor according to claim 1, it is characterized in that: the distance between described multi-electrode plate (3) and the described common electrical pole plate (4) is 1mm ~ 1.5mm.
3. a kind of parallel-plate multielectrode capacitance formula fuel level sensor according to claim 1 and 2; it is characterized in that: described power circuit comprises unidirectional protection diode D1, three terminal regulator IC1, storage capacitor C11, divider resistance R1 and R2, charging current limiter resistance R 3, work current-limiting resistance R4, and the 12V supply voltage provides power-off signal to data acquisition and treatment circuit after divider resistance R1, R2 dividing potential drop.
4. a kind of parallel-plate multielectrode capacitance formula fuel level sensor according to claim 1 and 2, it is characterized in that: described data acquisition and treatment circuit comprise the data that single-chip microcomputer IC2, C0 reference capacitance, C0, potential electrode C1-C10, single-chip microcomputer IC2 gather C0-C10, export control signal by I/O port the 21st pin to 28 pin after treatment; 12 pin of single-chip microcomputer IC2 are connected with 3 pin of the three terminal regulator IC1 of power circuit.
5. a kind of parallel-plate multielectrode capacitance formula fuel level sensor according to claim 1 and 2, it is characterized in that: described signal output apparatus comprises field effect transistor Q1-Q8, output resistance R5-R12, filter capacitor C14, and the grid of Q1-Q8 wherein receives the control signal of single-chip microcomputer IC2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220684823 CN203163821U (en) | 2012-12-12 | 2012-12-12 | Parallel plate multi-electrode capacitance type oil level sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220684823 CN203163821U (en) | 2012-12-12 | 2012-12-12 | Parallel plate multi-electrode capacitance type oil level sensor |
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| CN203163821U true CN203163821U (en) | 2013-08-28 |
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| CN 201220684823 Expired - Lifetime CN203163821U (en) | 2012-12-12 | 2012-12-12 | Parallel plate multi-electrode capacitance type oil level sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103017863A (en) * | 2012-12-12 | 2013-04-03 | 重庆德格科技发展有限公司 | Parallel-plate multi-electrode capacitance type oil level sensor |
| CN111801553A (en) * | 2018-02-02 | 2020-10-20 | 贝鲁特美国大学 | Thickness measuring device and using method |
-
2012
- 2012-12-12 CN CN 201220684823 patent/CN203163821U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103017863A (en) * | 2012-12-12 | 2013-04-03 | 重庆德格科技发展有限公司 | Parallel-plate multi-electrode capacitance type oil level sensor |
| CN111801553A (en) * | 2018-02-02 | 2020-10-20 | 贝鲁特美国大学 | Thickness measuring device and using method |
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Granted publication date: 20130828 |