CN203858003U - Sampling circuit of vehicular fuel gauge - Google Patents
Sampling circuit of vehicular fuel gauge Download PDFInfo
- Publication number
- CN203858003U CN203858003U CN201420235614.3U CN201420235614U CN203858003U CN 203858003 U CN203858003 U CN 203858003U CN 201420235614 U CN201420235614 U CN 201420235614U CN 203858003 U CN203858003 U CN 203858003U
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- Prior art keywords
- resistor
- resistance
- variohm
- sample circuit
- power supply
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- 238000005070 sampling Methods 0.000 title claims abstract description 35
- 239000000446 fuel Substances 0.000 title abstract description 29
- 239000000295 fuel oil Substances 0.000 claims description 31
- 238000001514 detection method Methods 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 13
- 239000002828 fuel tank Substances 0.000 description 4
- 235000015927 pasta Nutrition 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
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Abstract
The utility model provides a sampling circuit of a vehicular fuel gauge. The sampling circuit comprises a power supply, a control triode, a bleeder resistor, a variable resistor and a balancing resistor. The power supply is connected to one end of the bleeder resistor via the control triode, the other end of the bleeder resistor is connected to a fixed terminal of the variable resistor, the resistance regulating end of the variable resistor is connected to one end of the balancing resistor, and the other end of the balancing resistor is grounded. The control triode is added, so that the problem of temperature rise due to the fact that components in a fuel pump are in the power-on state constantly is avoided, and safety in fuel detection is improved; by the three-wire system sampling circuit structure, contact of a slip sheet with the resistors is shielded, and sampling precision is improved; all potential reference points are unified, so that calculation error is reduced. By the sampling circuit, indication accuracy of the vehicular fuel gauge is improved greatly, and safety in fuel use is guaranteed.
Description
Technical field
The utility model relates to amount of fuel acquisition technique field, relates to more specifically a kind of sample circuit of fuel oil for vehicles table.
Background technology
Fuel oil for vehicles table is in order to indicate the Fuel Oil Remaining in fuel tank of vehicle, fuel gauge system is mainly made up of oil mass indicating gauge and fuel head sensor, oil mass indicating gauge is indicated to corresponding oil mass position according to the resistance of fuel head sensor, and fuel head sensor gathers fuel head positional information based on sample circuit, in described sample circuit, often obtain pasta height information with rheostat, the high and low position of concrete pasta changes rheostatic slide plate position, thereby the resistance that rheostat is introduced in sample circuit changes with the height of pasta, and then obtain fuel head positional information.Fuel oil for vehicles table oil mass data sampling circuit of the prior art adopts two-wire system sample circuit more, as shown in Figure 1, power supply V is connected in the slide plate end of variable resistor Rx through current-limiting resistance R, the other end ground connection of variable resistor Rx, slide plate end at variable resistor Rx obtains sampled voltage V1, according to sampled voltage V1 and known supply voltage V and resistance R, show that variable resistor Rx introduces the resistance in sample circuit: R '=(V1*R)/(V-V1), its precision depends on V1(V, R is design fixed value), R ' is that fuel oil surface height is directly related with the slide plate position of variable resistor Rx, therefore R ' is the fuel oil sampling resistance that can react amount of fuel in fuel tank, transforming converts is shown on oil mass indicating gauge.There is following defect in sample circuit of the prior art: 1) power supply V mono-direct power supply, and because fuel pump is immersed in oil, circuit is switched on always, and components and parts can cause temperature to raise because working long hours, and then cause potential safety hazard; 2) between the slide plate of fuel sensor and variable resistor conduction band, there is contact resistance, be included in R ', make the sampling resistance R ' that finally the obtains Fuel Oil Remaining in can not accurate response fuel tank of vehicle, thereby affect the instruction accuracy of fuel gauge; 3) voltage and variable-resistance with reference to GND not in same point, GND that the reference ground of power supply is instrument end, and variable-resistance be the GND end of fuel pump with reference to ground, and then cause and make V-V1 value inaccurate, had a strong impact on the accuracy of the resistance R ' that samples.Therefore the problem such as large, the poor reliability of fuel gauge sample circuit ubiquity index error of the prior art, for the use of vehicle causes potential safety hazard, especially there is sometimes the situation of fuel oil surplus reading higher than actual fuel oil surplus in fuel gauge, make automobile show and under oil condition, occur suddenly the situation that fuel oil exhausts at oil mass indicating gauge, had a strong impact on the use safety of vehicle.
Summary of the invention
The utility model is based on above-mentioned prior art problem, the sample circuit of a kind of fuel oil for vehicles table of proposition of innovation, control triode by increasing in the sample circuit of fuel gauge, having avoided components and parts in fuel pump is the temperature rising problem that sensing oil mass causes in "on" position always, has improved the security of fuel oil sensing; By adopting three-wire system sample circuit structure, shield the contact resistance between slide plate and conduction band completely, greatly improve sampling precision; By the earth terminal of sample circuit is connected with instrumentation grounding end, ensure that each point potential reference point is unified, reduce the error of calculation.Sample circuit provided by the utility model can obtain the sampling resistance of reaction fuel oil surplus accurately, has greatly improved instruction accuracy and the precision of automobile fuel gauge, has ensured that automobile uses safety.
It is as follows that the utility model solves the problems of the technologies described above taked technical scheme:
A kind of sample circuit of fuel oil for vehicles table, comprise: power supply, control triode, voltage grading resistor, variohm and balancing resistor, described power supply is connected in one end of described voltage grading resistor through described control triode, described control triode is as the power switch of whole circuit, described variohm comprises two fixed terminals and a resistance adjustable side, the other end of described voltage grading resistor is connected in a fixed terminals of described variohm, the resistance adjustable side of described variohm is connected in one end of described balancing resistor, the other end ground connection of described balancing resistor.
Further according to sample circuit described in the utility model, wherein between described voltage grading resistor and variohm, draw the first sampling end, the unsettled setting of another fixed terminals of described variohm is also drawn the second sampling end from this another fixed terminals, and the other end of described balancing resistor is connected in the reference earth terminal of described power supply.
Further according to sample circuit described in the utility model, wherein said control triode is NPN triode, described power supply is connected in the collector of NPN triode, the base stage of described NPN triode is as controlling of sampling end, and the emitter of described NPN triode is connected in one end of described voltage grading resistor.
Further according to sample circuit described in the utility model, wherein said variohm is slide rheostat, the other end of described voltage grading resistor is connected on the binding post of resistance wire one end in described slide rheostat, resistance in described slide rheostat regulates slide plate to be connected in described balancing resistor, and in described slide rheostat, the binding post at resistance wire two ends is drawn described the first sampling end and the second sampling end.
Further, according to sample circuit described in the utility model, the resistance of wherein said balancing resistor is 1/6 ~ 1/5 of the total resistance of described variohm.
Further according to sample circuit described in the utility model, fuel oil that wherein said sample circuit obtains sampling resistance R '=((V1-V2) * R1)/(V-V1), the magnitude of voltage that wherein V is described power supply, R1 is the resistance of described voltage grading resistor, V1 is the magnitude of voltage that described the first sampling end gathers, and V2 is the magnitude of voltage that described the second sampling end gathers.
At least can reach following technique effect by the technical solution of the utility model:
1), the utility model by the sample circuit of fuel gauge increase control triode, avoided in fuel pump
Components and parts are temperature rising problem and the oil pump fault problem that sensing oil mass causes in "on" position always, have ensured the security of fuel oil circuits sense;
2), the utility model is by adopting three-wire system sample circuit structure, shielded the contact resistance between slide plate and variable resistor conduction band completely, greatly improved the sampling precision of fuel oil resistance;
3), the utility model is by being that instrumentation grounding end is connected by the earth terminal of sample circuit and the reference earth terminal of power supply, ensures that each point potential reference point is unified, greatly reduced the error of calculation;
4), sample circuit novel structure described in the utility model, can solve existing fuel oil simultaneously and adopt the problems in circuit, and provide accuracy high fuel oil sampling resistance, for fuel oil for vehicles table accurately reflects that in fuel tank, Fuel Oil Remaining provides important evidence, can be good at being applicable in the fuel gauge system of various vehicles, the potential safety hazard of having avoided amount of fuel sensing to bring, has wide market practical prospect.
Brief description of the drawings
Accompanying drawing 1 is the sample circuit structural drawing of fuel oil for vehicles table in prior art;
Accompanying drawing 2 is the structural drawing of the sample circuit of fuel oil for vehicles table described in the utility model.
Embodiment
Below in conjunction with accompanying drawing, the technical solution of the utility model is described in detail, so that those skilled in the art can more clearly understand the utility model, but does not therefore limit protection domain of the present utility model.
As shown in Figure 2, the sample circuit of fuel oil for vehicles table described in the utility model comprises power supply V, control triode K, voltage grading resistor R1, variohm Rx and balancing resistor R2, described power supply V is connected in the collector of described control triode K, the emitter of described control triode K is connected in one end of voltage grading resistor R1, the other end of described voltage grading resistor R1 is connected in variohm Rx and draws the first voltage detecting end V1 from this other end, described variohm Rx comprises fixed terminals and the resistance adjustable side in two ends, the other end of described voltage grading resistor R1 is connected in the fixed terminals of variohm Rx one end, the fixed terminals of the described variohm Rx other end is unsettled and as second voltage test side V2, the resistance adjustable side of described variohm Rx is connected in one end of balancing resistor R2, the other end ground connection of described balancing resistor R2, and this earth terminal of described balancing resistor R2 is connected in the reference earth terminal of described power supply V, the GND end that the reference ground of general described power supply is instrument, therefore this earth terminal of described balancing resistor R2 is connected in the earth terminal of instrument.
Described variohm Rx adopts common rheostat, preferably slide rheostat, comprise in two link posts and a resistance at two ends and regulate slide plate P, one of them link post is connected in described voltage grading resistor R1, another link post is unsettled, described resistance regulates slide plate P ground connection after balancing resistor R2, draws respectively two voltage detecting ends from two link posts of described slide rheostat.
Described control triode K preferably adopts NPN triode, by the conducting at its base stage input control signal control triode K with close.
Fuel oil sampling resistance R '=((V1-V2) * R1) that obtain by sample circuit described in the utility model/(V-V1), wherein V is supply voltage, R1 is the resistance of voltage grading resistor, the first voltage detecting end detected magnitude of voltage of V1 for drawing between voltage grading resistor R1 and variohm Rx, the second voltage test side detected magnitude of voltage of V2 for drawing at the unsettled stiff end of variohm Rx, because of the introducing of balancing resistor R2, (V1-V2) value can be reacted accurately and be added in the voltage in the resistance in variohm introducing sample circuit, this resistance is only slided and is controlled by slide plate, the slip of slide plate is controlled by pasta height, so just avoid the impact of slide plate self and slide plate and variable resistor conduction band Contact resistance completely, greatly improve the sampling precision of fuel oil resistance, while is due to the fuel qualities difference of different model, impurities and the contact resistance bringing are different, adopting this design also to evade different oil products is completely the fuel oil resistance error of bringing of sampling, break-make connection status between described control triode K is inputted by its base stage simultaneously control signal control power supply V and voltage grading resistor R1, and then the ON time of controlling triode in the sampling period can be controlled in very short scope, be preferably in 100ms in the sampling period, the ON time of controlling triode is only 1ms, in the ON time of this 1ms, sample, so substantially, the problem of having avoided the long-time energisings of components and parts such as resistance in fuel pump to cause excess Temperature to bring, has ensured that oil mass detects security, as mentioned above that the potential reference point of power supply, the first voltage detecting end and second voltage test side is unified, reduce (V-V1) and the error of calculation (V1-V2), improve the accuracy of fuel oil sampling resistance R '.
Below be only that preferred implementation of the present utility model is described; the technical solution of the utility model is not limited to this; the any known distortion that those skilled in the art do on the basis of major technique design of the present utility model all belongs to the claimed technology category of the utility model, and the concrete protection domain of the utility model is as the criterion with the record of claims.
Claims (6)
1. the sample circuit of a fuel oil for vehicles table, it is characterized in that, comprise: power supply, control triode, voltage grading resistor, variohm and balancing resistor, described power supply is connected in one end of described voltage grading resistor through described control triode, described control triode is as the power switch of whole circuit, described variohm comprises two fixed terminals and a resistance adjustable side, the other end of described voltage grading resistor is connected in a fixed terminals of described variohm, the resistance adjustable side of described variohm is connected in one end of described balancing resistor, the other end ground connection of described balancing resistor.
2. sample circuit according to claim 1, it is characterized in that, between described voltage grading resistor and variohm, draw the first sampling end, the unsettled setting of another fixed terminals of described variohm is also drawn the second sampling end from this another fixed terminals, and the other end of described balancing resistor is connected in the reference earth terminal of described power supply.
3. sample circuit according to claim 2, it is characterized in that, described control triode is NPN triode, described power supply is connected in the collector of NPN triode, the base stage of described NPN triode is as controlling of sampling end, and the emitter of described NPN triode is connected in one end of described voltage grading resistor.
4. according to the sample circuit described in claim 2 or 3, it is characterized in that, described variohm is slide rheostat, the other end of described voltage grading resistor is connected in the binding post of resistance wire one end in described slide rheostat, resistance in described slide rheostat regulates slide plate to be connected in described balancing resistor, and in described slide rheostat, the binding post at resistance wire two ends is drawn described the first sampling end and the second sampling end.
5. sample circuit according to claim 2, is characterized in that, the resistance of described balancing resistor is 1/6 ~ 1/5 of the total resistance of described variohm.
6. sample circuit according to claim 2, it is characterized in that, fuel oil that described sample circuit obtains sampling resistance R '=((V1-V2) * R1)/(V-V1), the magnitude of voltage that wherein V is described power supply, R1 is the resistance of described voltage grading resistor, V1 is the magnitude of voltage that described the first sampling end gathers, and V2 is the magnitude of voltage that described the second sampling end gathers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420235614.3U CN203858003U (en) | 2014-05-09 | 2014-05-09 | Sampling circuit of vehicular fuel gauge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420235614.3U CN203858003U (en) | 2014-05-09 | 2014-05-09 | Sampling circuit of vehicular fuel gauge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203858003U true CN203858003U (en) | 2014-10-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420235614.3U Expired - Lifetime CN203858003U (en) | 2014-05-09 | 2014-05-09 | Sampling circuit of vehicular fuel gauge |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104833404A (en) * | 2014-11-06 | 2015-08-12 | 北汽福田汽车股份有限公司 | Oil level detection device, automobile, oil tank and oil level detection method |
| CN104833705A (en) * | 2014-10-27 | 2015-08-12 | 北汽福田汽车股份有限公司 | Automobile, and fuel oil monitoring device |
| CN105606180A (en) * | 2015-12-28 | 2016-05-25 | 奇瑞汽车股份有限公司 | Sampling circuit of automotive fuel gauge and fault diagnosis method thereof |
| CN105651322A (en) * | 2016-01-14 | 2016-06-08 | 奇瑞汽车股份有限公司 | Display method of automobile fuel gauge |
| CN106526386A (en) * | 2016-12-06 | 2017-03-22 | 重庆科技学院 | Automobile fuel injection test system |
| CN109084867A (en) * | 2018-07-11 | 2018-12-25 | 黑龙江天有为电子有限责任公司 | A kind of automobile combination meter fuel oil emulation test system and method |
| CN109580025A (en) * | 2019-01-23 | 2019-04-05 | 无锡华宸控制技术有限公司 | A kind of wide scope platinum resistance temperature sample circuit |
-
2014
- 2014-05-09 CN CN201420235614.3U patent/CN203858003U/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104833705A (en) * | 2014-10-27 | 2015-08-12 | 北汽福田汽车股份有限公司 | Automobile, and fuel oil monitoring device |
| CN104833404A (en) * | 2014-11-06 | 2015-08-12 | 北汽福田汽车股份有限公司 | Oil level detection device, automobile, oil tank and oil level detection method |
| CN104833404B (en) * | 2014-11-06 | 2018-11-09 | 北京宝沃汽车有限公司 | Oil level detecting device, automobile, fuel tank and oil level detection method |
| CN105606180A (en) * | 2015-12-28 | 2016-05-25 | 奇瑞汽车股份有限公司 | Sampling circuit of automotive fuel gauge and fault diagnosis method thereof |
| CN105606180B (en) * | 2015-12-28 | 2018-08-14 | 奇瑞汽车股份有限公司 | A kind of sample circuit and its method for diagnosing faults of fuel oil for vehicles table |
| CN105651322A (en) * | 2016-01-14 | 2016-06-08 | 奇瑞汽车股份有限公司 | Display method of automobile fuel gauge |
| CN105651322B (en) * | 2016-01-14 | 2018-09-21 | 奇瑞汽车股份有限公司 | A kind of display methods of automobile fuel gauge |
| CN106526386A (en) * | 2016-12-06 | 2017-03-22 | 重庆科技学院 | Automobile fuel injection test system |
| CN109084867A (en) * | 2018-07-11 | 2018-12-25 | 黑龙江天有为电子有限责任公司 | A kind of automobile combination meter fuel oil emulation test system and method |
| CN109580025A (en) * | 2019-01-23 | 2019-04-05 | 无锡华宸控制技术有限公司 | A kind of wide scope platinum resistance temperature sample circuit |
| CN109580025B (en) * | 2019-01-23 | 2021-01-26 | 无锡华宸控制技术有限公司 | Wide-range platinum resistor temperature sampling circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210210 Address after: Room 328, enterprise service center, 17 Lingang Avenue, Yibin Lingang Economic and Technological Development Zone, Yibin City, Sichuan Province, 644000 Patentee after: YIBIN COWIN AUTO Co.,Ltd. Address before: 241009 No. 8, Changchun Road, Wuhu economic and Technological Development Zone, Anhui, China Patentee before: CHERY AUTOMOBILE Co.,Ltd. |
|
| TR01 | Transfer of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 20141001 |
|
| CX01 | Expiry of patent term |