CN100334434C - Digital method for measuring quantity of fuel oil in fuel tank of motor vehicle, and metering device - Google Patents
Digital method for measuring quantity of fuel oil in fuel tank of motor vehicle, and metering device Download PDFInfo
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- CN100334434C CN100334434C CNB200510037392XA CN200510037392A CN100334434C CN 100334434 C CN100334434 C CN 100334434C CN B200510037392X A CNB200510037392X A CN B200510037392XA CN 200510037392 A CN200510037392 A CN 200510037392A CN 100334434 C CN100334434 C CN 100334434C
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Abstract
The present invention discloses a digital metering method for the quantity of fuel oil in a fuel tank of motor vehicle and a meter. The method orderly comprises the following steps that (1) the capacity of the fuel tank is quantized into a plurality of sections in advance; (2) the equiponderant fuel is injected section by section; (3) the current oil quantity and a current liquid level A/D conversion value detected by a fuel oil meter sensor at the liquid level are recorded and stored by a microcontroller; (4) subsequently, the microcontroller compares the A/D conversion value from the fuel oil meter sensor with the recorded and stored A/D conversion value in a state for detecting the quantity of the fuel oil in a real time way so as to obtain a value approaching to the A/D conversion value of one section, and simultaneously, the current real time the quantity of the fuel oil in the fuel tank is calculated out; the value is equal to the sum of accumulated capacities from a first section to the section and the quantity of the fuel oil corresponding to the section. The present invention has the advantages of simple composition structure, high detection precision, long service life, convenient installation and maintenance, low cost, high universality and easy popularization. The meter can be used as a matching device to be installed on the novel vehicle, and the meter can also be used for the digitized refitting for the old vehicle.
Description
Technical field
The present invention relates to measurement, especially relate to a kind of quantity of fuel oil in fuel tank of motor vehicle numeral metering method by buoy indication volume.
Background technology
The motor vehicle electronic instrument is the new high-tech product that adopts microelectric technique, fax sense technology to make.Fuel gauge in order to the trapped fuel quantity in the indication mobile vehicle fuel case is made up of the fuel oil face indicating gauge and the fuel head sensor of band voltage stabilizer mostly, the fuel gauge sensor is a variable resistor by the control of float height, variation according to monitored fuel oil face height changes its resistance value, by the trapped fuel quantity in the instrument indication fuel tank, majority is 3～5 scales, respectively full, (3/4) 1/2 of indication roughly, (1/4) sky.Can only show that the reason that amount of fuel in the fuel tank accounts for the general proportions of capacity of the fuel tank is, the shape of mobile vehicle fuel case is non-linear in vertical direction often, the linear change of liquid level face is not directly proportional with the variation of amount of fuel in the case, and the float of fuel gauge sensor is not directly proportional with the variation of liquid level face with the output data that the liquid level face moves yet.The fuel tank measuring instrument can not reflect the actual amount of fuel in the non-linear fuel tank exactly, just is difficult to satisfy the needs that degree of precision detects and digitizing shows.The metering method that some adopts fuel tank shape and capacity at vehicle to customize special-purpose amount of fuel sensor and digital type fuel oil table adapted, though can realize the amount of fuel numeral of degree of precision shows, but, the cost costliness of this amount of fuel sensor, do not possess versatility, be not easy to installation and maintenance yet.
Summary of the invention
Technical matters to be solved by this invention is the defective that remedies prior art, proposes a kind of quantity of fuel oil in fuel tank of motor vehicle numeral metering method that detection of energy degree of precision and digitizing show quantity of fuel oil in fuel tank.
Technical matters of the present invention is solved like this:
This quantity of fuel oil in fuel tank of motor vehicle numeral metering method adopts input end to be connected with the testing circuit of the fuel gauge sensor that is installed in the fuel tank, and the microcontroller and the storer that is connected with microcontroller that are connected the testing circuit output terminal.
The characteristics of this quantity of fuel oil in fuel tank of motor vehicle numeral metering method are: following steps are arranged successively:
(1) in advance capacity of the fuel tank is quantified as some sections;
(2) inject the equivalent fuel oil piecemeal;
(3) by this current oil mass of microcontroller recorded and stored and described fuel gauge sensor detecting liquid level of living in to the A/D conversion value of current liquid level;
(4) enter real-time amount of fuel detected state, the A/D conversion value of the current liquid level that the fuel gauge sensor is detected by microcontroller and the A/D conversion value of recorded and stored compare, draw a certain section of the immediate A/D conversion value of numerical value, and calculating the current real-time amount of fuel of fuel tank, it is the corresponding oil mass sum of first section to the capacity that adds up with affiliated this section of this section.
For quantity of fuel oil in fuel tank of motor vehicle numeral metering method, technical matters of the present invention is to solve according to qualifications like this:
Described step (1) is quantified as capacity of the fuel tank some sections in advance, be according to the measuring accuracy of fuel tank total volume L size and requirement, in advance capacity of the fuel tank be quantified as the m section, every section capacity of the fuel tank is L/m, from capacity is 0 to L to m+1 section sampling spot, m 〉=1 should be arranged.
Described step (2) inject piecemeal equivalent fuel oil and step (3) by this current oil mass of microcontroller recorded and stored and described fuel gauge sensor detecting liquid level of living in to the A/D conversion value of current liquid level, be that fuel tank is put sky, i.e. the current oil mass L of fuel tank
0=0, by this current oil mass L of microcontroller recorded and stored
0=0 and the A/D conversion value V of the current liquid level that arrives at detecting liquid level of living in of fuel gauge sensor floating device
0, then, the oil mass that the first section capacity of the fuel tank that is quantized according to step (1) injects with the etalon metering is the fuel oil of L/m, again by this current oil mass L of microcontroller recorded and stored
1The A/D conversion value V of the current liquid level that=1 * L/m and fuel gauge sensor floating device arrive at detecting liquid level of living in
1, Repeated m-2 time again, the oil mass that the i section capacity of the fuel tank that is quantized according to step (1) injects with the etalon metering is the fuel oil of L/m, 1≤i≤m wherein is by this current oil mass L of microcontroller recorded and stored
iThe A/D conversion value V of the current liquid level that=i * L/m and fuel gauge sensor floating device arrive at detecting liquid level of living in
i: V
2... V
M-1, last, the m section that is quantized according to step (1) is that the oil mass that highest region section capacity of the fuel tank injects with the etalon metering is the fuel oil of L/m, fuel tank is put expires, i.e. the current oil mass L of fuel tank
m=m * L/m=L is again by this current oil mass L of microcontroller recorded and stored
mThe A/D conversion value V of the current liquid level that=m * L/m=L and fuel gauge sensor floating device arrive at detecting liquid level of living in
m
Described step (4) is to enter real-time amount of fuel detected state, by the A/D conversion value V of microcontroller with fuel gauge sensor floating device recorded and stored in the A/D conversion value Vc of the fuel gauge sensor of the real-time detection of liquid level of living in and step (2), (3)
1... V
mCompare, draw the i section of the immediate A/D conversion value of numerical value, and calculate corresponding the oil mass { (Vc-V of this A/D conversion value Vc
I-1)/(V
i-V
I-1) * L
i, and the current real-time amount of fuel Lc=L of fuel tank
1+ ... L
I-1+ { (Vc-V
I-1)/(V
i-V
I-1) * L
i, 1≤i≤m wherein.
Described current real-time amount of fuel Lc is the corresponding oil mass sum of the capacity that adds up with the affiliated i section of section to the i-1 section, is shown with numeral by microprocessor controls numeral display module.It is bigger that capacity of the fuel tank quantizes sector number m, and the actual amount of fuel error of detection is just little.Be easy operation, under the preceding topic that guarantees precision, sector number m should not be too big.Fuel gauge sensor of the present invention is a variable resistor by the control of float height, when float is movable at various height, sensor scribing resistance size is followed variation, the voltage of sensor input end in a scope to change, handling procedure detects the change in voltage scope of fuel gauge sensor and carries out the A/D conversion, and the analog signal conversion of voltage is become digital signal.The present invention carries out branch section at fuel tank fuel quantity from the output A/D value of sky when full to the float of fuel-quantity transducer and samples and get a little, writes down the A/D conversion value of every section sample point and the oil mass of every section correspondence.The A/D value when detecting in real time in every section and the amount of fuel of this section are handled by linear corresponding relation, promptly calculate the corresponding amount of fuel of current A/D value at this section by linear relationship, again this amount of fuel is added that the section before this section adds up amount of fuel, is the current amount of fuel of fuel tank.
Adopt the quantity of fuel oil in fuel tank of motor vehicle digital meter table of described amount of fuel numeral metering method, comprise that input end is connected with the testing circuit of the fuel gauge sensor that is installed in the fuel tank, digital display module and button inputting circuits.
The characteristics of this quantity of fuel oil in fuel tank of motor vehicle digital meter table are:
Be provided with microcontroller that is connected the testing circuit output terminal and the storer that is connected with microcontroller, the output terminal of described microcontroller is connected with digital display module, and the input end of described microcontroller is connected with button inputting circuits;
The microcontroller of the A/D conversion value of the described microcontroller current liquid level that to be the current oil mass of recorded and stored fuel tank and described fuel gauge sensor arrive at detecting liquid level of living in;
Described microcontroller still compares the A/D conversion value of fuel gauge sensor and the A/D conversion value of recorded and stored, draws a certain section of the immediate A/D conversion value of numerical value, and calculates the microcontroller of the current real-time amount of fuel of fuel tank.
Described digital display module is the digital display module that shows real-time amount of fuel, oil amount, leakage amount of fuel.
The display device of described digital display module comprises that simulation on the instrument panel that is installed in pilothouse shows multi-stage light emitting striation, digital amount of fuel display screen, status indicator lamp, the warning loudspeaker of amount of fuel.
The button of described button inputting circuits is installed on the instrument panel of pilothouse.
Also be provided with the sound light alarming circuit, the real time clock circuit that are connected with microcontroller respectively.
Amount of fuel numeral metering method of the present invention is used micro-computer technology, the accuracy of detection of fuel gauge can be set as required, adopt the dynamic partition section that detection method is set, utilize first wife's amount of fuel sensor of vehicle pointer-type fuel gauge, eliminate the cumulative errors of fuel tank and sensor nonlinear computation, improved vehicle numeral fuel gauge precision significantly.Can realize that the digitizing of non-linear fuel tank degree of precision shows with low-cost device, can intuitively, accurately, stably show increase and decrease, the oil amount of quantity of fuel oil in fuel tank and leak amount of fuel and detect and storing queries, make the motorist accomplish number is accurately arranged with oil, oiling.Solved the versatility problem that same type figure fuel gauge is applied to difformity fuel tank, different size fuel sensor.The fuel tank that the present invention can be widely used in multiple motor vehicles such as car, offroad vehicle, family's van, passenger vehicle, truck, large-scale truck, special purpose vehicle and motorcycle, equipment detects and the amount of fuel that monitors in it.
Description of drawings
Below the contrast accompanying drawing and in conjunction with embodiment the present invention is further detailed explanation:
Fig. 1 is the synoptic diagram of the fuel tank of vehicle amount of fuel numeral metering method of the embodiment of the invention;
Fig. 2 is the schematic appearance of the fuel tank of vehicle amount of fuel numeral gauging table of the embodiment of the invention;
Fig. 3 is the circuit block diagram of the fuel tank of vehicle amount of fuel numeral gauging table of the embodiment of the invention.
Embodiment
A kind of fuel tank of vehicle amount of fuel numeral metering method
Adopt fuel tank of vehicle amount of fuel numeral gauging table as shown in Figure 1, 2, 3, comprise testing circuit 1 and be connected the microcontroller 2 of its output terminal that the input end of described testing circuit 1 is connected with the fuel gauge sensor 4 that is installed in the fuel tank 3 respectively, is installed in the odometer sensor 5 in the system of vehicle transmission parts.
Described microcontroller 2 is connected with digital display module 6, button inputting circuits 7, storer 8, sound light alarming circuit 9, real time clock circuit 10, microcontroller 2 detects the voltage of fuel gauge sensor 4 and the pulse signal of odometer sensor 5 by testing circuit 1, carries out program curing and calculates fuel tank 3 current oil masses, distance travelled, current vehicle speed data and analyzing and processing.
Described button inputting circuits 7 be used for to this instrument be provided with, operation such as inquiry,
Described storer 8 is used for information processings such as oiling information, time, mileage,
Described sound light alarming circuit 9 is used for the warning message indication,
Described real time clock circuit 10 provides real-time clock for microcontroller 2.
Described digital display module 6 shows real-time amount of fuel, oil amount, leaks amount of fuel, shows distance travelled, current vehicle speed information.
The display device of numeral display module 6, the button 11 of button inputting circuits 7, the warning of sound light alarming circuit 9 are installed on the instrument panel 14 of pilothouse with loudspeaker 12, status indicator lamp 13.Also be provided with multi-stage light emitting striation 15, digital amount of fuel display screen 16, real-time time display screen 17, voltage/mileage/speed of a motor vehicle display screen 18 that simulation shows amount of fuel on the instrument panel 14.
The metering method of this fuel tank of vehicle amount of fuel numeral gauging table has following steps successively:
(1) measuring accuracy that rises and require according to fuel tank 3 total volume L=140 is quantified as 7 sections with fuel tank 3 capacity in advance, and every section fuel tank 3 capacity are the L/7=20 liter, and being 0 to 140 pair from capacity should have 7+1=8 section sampling spot;
(2) fuel tank 3 is put sky, i.e. the current oil mass L of fuel tank 3
0=0, by this current oil mass L of microcontroller 2 recorded and stored
0=0 and the A/D conversion value V of the current liquid level that arrives at detecting liquid level of living in of the float 19 of fuel gauge sensor 4
0=25, then, the oil mass that the first section fuel tank, 3 capacity that quantized according to step (1) inject with the etalon metering is the fuel oil that L/7=20 rises, again by this current oil mass L of microcontroller 2 recorded and stored
1=1 * L/7=20 rises and the A/D conversion value V of the current liquid level that the float 19 of fuel gauge sensor 4 arrives at detecting liquid level of living in
1=175;
(3) repeat (2) 7-2=5 time, the oil mass that i section fuel tank 3 capacity that quantized according to step (1) inject with the etalon metering is the fuel oil of L/7=20 liter, and 1≤i≤7 wherein are by this current oil mass L of microcontroller 2 recorded and stored
iThe A/D conversion value V of the current liquid level that the float 19 of=i * L/7 and fuel gauge sensor 4 arrives at detecting liquid level of living in
i: V
2=305, V
3=435, V
4=565, V
5=695, V
6=835, last, the SECTOR-SEVEN section that is quantized according to step (1) is that the oil mass that highest region section fuel tank 3 capacity inject with the etalon metering is the fuel oil that L/7=20 rises, and fuel tank 3 is put expires, i.e. the current oil mass L of fuel tank
7=7 * L/7=L=140 liter is again by this current oil mass L of microcontroller 2 recorded and stored
7=7 * L/7=L=140 rises and the A/D conversion value V of the current liquid level that the float 19 of fuel gauge sensor 4 arrives at detecting liquid level of living in
7=985
(4) enter real-time amount of fuel detected state, by the A/D conversion value V of microcontroller 2 with the float 19 of fuel gauge sensor 4 recorded and stored in the A/D conversion value Vc of the fuel gauge sensor 4 of the real-time detection of liquid level of living in and step (2), (3)
1... V
7Compare, draw the i section of the immediate A/D conversion value of numerical value, and calculate corresponding the oil mass { (Vc-V of this A/D conversion value Vc
I-1)/(V
i-V
I-1) * L
i, and the current real-time amount of fuel Lc=L of fuel tank 3
1+ ... + L
I-1+ { (Vc-V
I-1)/(V
i-V
I-1) * L
i, 1≤i≤7 wherein.
The for example real-time A/D conversion value Vc=265 that detects is with the A/D conversion value V of recorded and stored
1... V
7Compare V
1＜Vc＜V
2, be in second section, calculate corresponding the oil mass { (Vc-V of this A/D conversion value Vc by microcontroller 2
1)/(V
2-V
1) * L
2=(265-175)/(305-175) * the 20=13.85 liter, and the current real-time amount of fuel Lc=L of fuel tank 3
1+ { (Vc-V
1)/(V
2-V
1) * L
2=20+{ (265-175)/(305-175) } * the 20=33.85 liter, it is the corresponding oil mass sum of capacity with affiliated second section of first section.
The for example real-time again A/D conversion value Vc=565=V that detects
4, be in the 4th section sampling spot, calculate corresponding the oil mass { (Vc-V of this A/D conversion value Vc by microcontroller 2
3)/(V4
i-V
3) * L
4=(565-435)/(565-435) * the 20=20 liter, and the current real-time amount of fuel Lc=L of fuel tank 3
1+ L
2+ L
3+ { (Vc-V
3)/(V4
i-V
3) * L
4=20+20+20+ (565-435)/(565-435) * 20=80 liter, it is the corresponding oil mass sum of the capacity that adds up with affiliated the 4th section of first section to the, three sections.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to the scope of patent protection that the present invention is determined by claims of being submitted to.
Claims (4)
1. quantity of fuel oil in fuel tank of motor vehicle numeral metering method, adopt input end to be connected with the testing circuit of the fuel gauge sensor that is installed in the fuel tank, and the microcontroller and the storer that is connected with microcontroller that are connected the testing circuit output terminal, it is characterized in that having successively following steps:
(1) in advance capacity of the fuel tank is quantified as some sections;
(2) inject the equivalent fuel oil piecemeal;
(3) by this current oil mass of microcontroller recorded and stored and described fuel gauge sensor detecting liquid level of living in to the A/D conversion value of current liquid level;
(4) enter real-time amount of fuel detected state, the A/D conversion value of the current liquid level that the fuel gauge sensor is detected by microcontroller and the A/D conversion value of recorded and stored compare, draw a certain section of the immediate A/D conversion value of numerical value, and calculating the current real-time amount of fuel of fuel tank, it is the corresponding oil mass sum of first section to the capacity that adds up with affiliated this section of this section.
2. according to the described quantity of fuel oil in fuel tank of motor vehicle numeral of claim 1 metering method, it is characterized in that:
Described step (1) is quantified as capacity of the fuel tank some sections in advance, be according to the measuring accuracy of fuel tank total volume L size and requirement, in advance capacity of the fuel tank be quantified as the m section, every section capacity of the fuel tank is L/m, from capacity is 0 to L to m+1 section sampling spot, m 〉=1 should be arranged.
3. according to the described quantity of fuel oil in fuel tank of motor vehicle numeral of claim 2 metering method, it is characterized in that:
Described step (2) inject piecemeal equivalent fuel oil and step (3) by this current oil mass of microcontroller recorded and stored and described fuel gauge sensor detecting liquid level of living in to the A/D conversion value of current liquid level, be that fuel tank is put sky, i.e. the current oil mass L of fuel tank
0=0, by this current oil mass L of microcontroller recorded and stored
0=0 and the A/D conversion value V of the current liquid level that arrives at detecting liquid level of living in of fuel gauge sensor floating device
0, then, the oil mass that the first section capacity of the fuel tank that is quantized according to step (1) injects with the etalon metering is the fuel oil of L/m, again by this current oil mass L of microcontroller recorded and stored
1The A/D conversion value V of the current liquid level that=1 * L/m and fuel gauge sensor floating device arrive at detecting liquid level of living in
1, Repeated m-2 time again, the oil mass that the i section capacity of the fuel tank that is quantized according to step (1) injects with the etalon metering is the fuel oil of L/m, 1≤i≤m wherein is by this current oil mass L of microcontroller recorded and stored
iThe A/D conversion value V of the current liquid level that=i * L/m and fuel gauge sensor floating device arrive at detecting liquid level of living in
i: V
2... V
M-1, last, the m section that is quantized according to step (1) is that the oil mass that highest region section capacity of the fuel tank injects with the etalon metering is the fuel oil of L/m, fuel tank is put expires, i.e. the current oil mass L of fuel tank
m=m * L/m=L is again by this current oil mass L of microcontroller recorded and stored
mThe A/D conversion value V of the current liquid level that=m * L/m=L and fuel gauge sensor floating device arrive at detecting liquid level of living in
m
4. according to the described quantity of fuel oil in fuel tank of motor vehicle numeral of claim 3 metering method, it is characterized in that:
Described step (4) is to enter real-time amount of fuel detected state, by the A/D conversion value V of microcontroller with fuel gauge sensor floating device recorded and stored in the A/D conversion value Vc of the fuel gauge sensor of the real-time detection of liquid level of living in and step (2), (3)
1... V
mCompare, draw the i section of the immediate A/D conversion value of numerical value, and calculate corresponding the oil mass { (Vc-V of this A/D conversion value Vc
I-1)/(V
i-V
I-1) * L
i, and the current real-time amount of fuel Lc=L of fuel tank
1+ ... + L
I-1+ { (Vc-V
I-1)/(V
i-V
I-1) * L
i, 1≤i≤m wherein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510037392XA CN100334434C (en) | 2005-09-16 | 2005-09-16 | Digital method for measuring quantity of fuel oil in fuel tank of motor vehicle, and metering device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510037392XA CN100334434C (en) | 2005-09-16 | 2005-09-16 | Digital method for measuring quantity of fuel oil in fuel tank of motor vehicle, and metering device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1760646A CN1760646A (en) | 2006-04-19 |
| CN100334434C true CN100334434C (en) | 2007-08-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200510037392XA Expired - Fee Related CN100334434C (en) | 2005-09-16 | 2005-09-16 | Digital method for measuring quantity of fuel oil in fuel tank of motor vehicle, and metering device |
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| CN (1) | CN100334434C (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102042857A (en) * | 2009-10-15 | 2011-05-04 | 上海思增工贸发展有限公司 | GPS (Global Position System) monitoring method for automotive fuel oil volume |
| WO2011113211A1 (en) * | 2010-03-19 | 2011-09-22 | Wu Maoting | Vehicle setting and calibration device |
| CN103017854B (en) * | 2011-09-28 | 2015-12-02 | 艾默生网络能源***北美公司 | Oil mass computing method, device and supervisory system |
| CN103308115B (en) * | 2012-11-02 | 2016-05-11 | 许昌学院 | A kind of method of effective elimination Digital Automobile oil meter potential safety hazard |
| CN106153138B (en) * | 2016-08-11 | 2019-05-21 | 上海伟世通汽车电子***有限公司 | The fuel gauge indicating means of automotive oil tank spilling oil mass |
| CN106627108A (en) * | 2016-10-21 | 2017-05-10 | 常诚车业江苏有限公司 | Device for vehicle-mounted headlamp fuel capacity prompt |
| CN106958596A (en) * | 2017-05-12 | 2017-07-18 | 如皋市非标轴承有限公司 | A kind of bearing for facilitating the oiling long life |
| CN112061330B (en) * | 2020-08-10 | 2021-10-15 | 集美大学 | Automatic alarm technology for leakage of ship cargo tank |
| CN112683373B (en) * | 2021-01-04 | 2023-10-27 | 东风汽车股份有限公司 | Test method and device for simulating whole vehicle working condition of vehicle oil mass system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4125022A (en) * | 1976-09-13 | 1978-11-14 | Toyo Kogyo Co., Ltd. | Digital fuel quantity indicators |
| CN85109432A (en) * | 1985-12-30 | 1987-07-08 | 前芝宗三郎 | Oil quantity indicator for horizontally mounted cylindrical gasoline tank |
| JPH06167372A (en) * | 1992-11-30 | 1994-06-14 | Nippon Seiki Co Ltd | Fuel gauge for vehicle |
-
2005
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4125022A (en) * | 1976-09-13 | 1978-11-14 | Toyo Kogyo Co., Ltd. | Digital fuel quantity indicators |
| CN85109432A (en) * | 1985-12-30 | 1987-07-08 | 前芝宗三郎 | Oil quantity indicator for horizontally mounted cylindrical gasoline tank |
| JPH06167372A (en) * | 1992-11-30 | 1994-06-14 | Nippon Seiki Co Ltd | Fuel gauge for vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1760646A (en) | 2006-04-19 |
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