CN102944279A - Automobile fuel sampling circuit - Google Patents
Automobile fuel sampling circuit Download PDFInfo
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- CN102944279A CN102944279A CN2012104247038A CN201210424703A CN102944279A CN 102944279 A CN102944279 A CN 102944279A CN 2012104247038 A CN2012104247038 A CN 2012104247038A CN 201210424703 A CN201210424703 A CN 201210424703A CN 102944279 A CN102944279 A CN 102944279A
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- fuel
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- control module
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Abstract
The invention discloses an automobile fuel sampling circuit which is characterized in that a middle connection point of a fuel sensor of the sampling unit is grounded through a resistor, two ends PIN-1 and PIN-3 of the fuel sensor respectively sample voltages V1 and V2, and the voltages V1 and V2 are respectively transmitted to a control unit. Due to the adoption of the circuit structure, the automobile fuel sampling circuit has the advantages as follows: 1, the sampling value of the fuel sensor is more accurate; 2, an alarm is given when the sampling value becomes invalid; and 3, the circuit structure is simple, and the production cost is low.
Description
Technical field
The present invention relates to the sampling of vehicle fuel, particularly a kind of vehicle fuel sample circuit.
Background technology
Automobile fuel gauge is the real-time consumption process of demonstration fuel oil and the steady indication in the consumption process, is a significant data in the vehicle traveling process, and can its accuracy directly have influence on automobile and normally travel.
Traditional fuel gauge uses the two-wire system fuel sensor, and the sort circuit structure has a contact resistance in the place of sensor sliding contact place, and this contact resistance is a uncertain resistance Rcontact, and the resistance that the control module sampling is calculated is Rx+Rcontact.Thereby so that the value that the control module sampling is calculated not is the actual value of sensor.
Provide a kind of novel fuel oil sample circuit for above-mentioned situation, so that the sampled value of sample circuit more accurately is the problem that prior art need to solve.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of vehicle fuel sample circuit, to reach the more accurate purpose of sampled value.
For achieving the above object, technical scheme of the present invention is, a kind of vehicle fuel sample circuit, it is characterized in that: described sample circuit is that the middle contact of fuel sensor passes through resistance eutral grounding, two ends PIN-1, the PIN-3 of fuel sensor carries out respectively voltage sample V1, V2 and passes to respectively control module, thereby introduce the three-wire system fuel sensor, avoided the impact of Rcontact on calculated value thereby be used for the AD sampling with two lines.
The Fuel control 1 Access Control unit of described fuel sensor, every 100ms transmits low level and carries out the sampling of A/D value to control module; Fuel control 2 is high level, when Fuel control 1 between the 99ms high period, Fuel control 2 provides the 1ms low level, checks for control module whether the Pin-3 pin normal.
The computing method of control module are in the described sample circuit: it is V1 that the PIN-1 end of fuel sensor records voltage, and it is V2 that the PIN-3 end records voltage; Then: sampling resistor Rx1=100 Ω * (V1-V2)/(5v-V1), wherein 100 for Pin-1 is provided by the pull-up resistor that provides, and 5V is the VCC supply voltage.
Described sample circuit is that the V1 value of control module sampling is carried out fault alarm not between 2.059V-4V the time; Sample circuit is that the V2 value of control module sampling is carried out fault alarm not between 0.555V-2.273V the time.
A kind of vehicle fuel sample circuit, owing to adopt above-mentioned circuit structure, the invention has the advantages that: 1 so that the sampled value of fuel sensor is more accurate; 2, can when losing efficacy, sampling numerical value in time report to the police; 3, circuit structure is simple, and production cost is low.
Description of drawings
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments;
Fig. 1 is the circuit diagram of a kind of vehicle fuel sample circuit of the present invention;
Embodiment
The present invention introduces the three-wire system fuel sensor, and this sensor has two lines to be used for the AD sampling, i.e. V1 and V2, and resistance of sensor R=100 Ω * (V1-V2)/(5v-V1) then, wherein parameter 100 and 5 is the sample circuit fixed value.Thereby avoided the impact of Rcontact on calculated value.Be the reliability of raising circuit, and draw simultaneously the sensor failure testing circuit.
Specifically as shown in Figure 1, the present invention is that the middle contact of fuel sensor passes through resistance eutral grounding, two ends PIN-1, the PIN-3 of fuel sensor carries out respectively voltage sample V1, V2 and passes to respectively control module, thereby introduce the three-wire system fuel sensor, avoided the impact of Rcontact on calculated value thereby be used for the AD sampling with two lines.
The Fuel control 1 Access Control unit of fuel sensor, every 100ms transmits low level and carries out the sampling of A/D value to control module.The computing method of control module are in the sample circuit: it is V1 that the PIN-1 end of fuel sensor records voltage, and it is V2 that the PIN-3 end records voltage; Then: sampling resistor Rx1=100 Ω * (V1-V2)/(5v-V1), wherein 100 for Pin-1 is provided by the pull-up resistor that provides, and 5V is the VCC supply voltage.And the V1 value of control module sampling is carried out fault alarm not between 2.059V-4V the time; Sample circuit is that the V2 value of control module sampling is carried out fault alarm not between 0.555V-2.273V the time.
Intermediate fuel oil sensor live part resistance variations scope Rx1 of the present invention is 20-300 Ω.Other end Rx2 variation range is 280-0 Ω.If it is V1 that the PIN-1 end records voltage, it is V2 that the PIN-3 end records voltage.Then: Rx1=100 Ω * (V1-V2)/(5v-V1), 100 pull-up resistors that provide for Pin-1 wherein, 5V is the VCC supply voltage.
Under the normal operation (during sampling): the voltage range of V1 is 2.059V-3.889V (8 AD value 105-198), and the voltage range of V2 is 0.555V-1.470V (8 AD value 28-75).If consider contact resistance (being located at 0-50 Ω changes): the voltage range of V1 is 2.059V-4V (8 AD value 105-204), and the voltage range of V2 is 0.555V-2.273V(8 position AD value 28-115.9).
By above-mentioned data as can be known, when following fault occurring:
Pin-1 pin open circuit: the V1 sampled voltage is near 5V(AD value 255), not in normal range, control module can be judged;
The Pin-1 pin is shorted to ground: the V1 sampled voltage is near 0V(AD value 0), not in normal range, control module can be judged;
Pin-3 pin open circuit: the V2 sampled voltage is near 5V(AD value 255), not in normal range, control module can be judged;
The Pin-3 pin is shorted to ground: the V2 sampled voltage is near 0V(AD value 0), not in normal range, control module can be judged;
Pin-2 pin open circuit: the voltage of V1 and V2 is about 4.97V near 5v() (the AD value is greater than 250) in normal range.Control module can be judged;
Pin-2 pin short circuit: in fact can not affect normal operation of sensor and sampling.If but contact resistance very little (below 10 Ω), the voltage of V2 is less than 0.38v (the AD value is less than 20), and control module also can be judged.
Testing result of the present invention is accurate.Fuel sensor is carried out time sharing sampling, can prolong fuel sensor serviceable life, can effectively find again the inefficacy of fuel sensor.
The above has carried out exemplary description to the present invention by reference to the accompanying drawings; obviously specific implementation of the present invention is not subjected to the restriction of aforesaid way; as long as the various improvement of having adopted technical solution of the present invention to carry out, or directly apply to other occasion without improvement, all within protection scope of the present invention.
Claims (4)
1. vehicle fuel sample circuit is characterized in that: described sample circuit be the middle contact of fuel sensor by resistance eutral grounding, two ends PIN-1, the PIN-3 of fuel sensor carries out respectively voltage sample V1, V2 and passes to respectively control module.
2. a kind of vehicle fuel sample circuit according to claim 1 is characterized in that: the Fuel control 1 Access Control unit of described fuel sensor, and every 100ms transmits low level to carry out A/D value to control module and samples; Fuel control 2 is high level, when Fuel control 1 between the 99ms high period, Fuel control 2 provides the 1ms low level, checks for control module whether the Pin-3 pin normal.
3. a kind of vehicle fuel sample circuit according to claim 1, it is characterized in that: the computing method of control module are in the described sample circuit: it is V1 that the PIN-1 end of fuel sensor records voltage, and it is V2 that the PIN-3 end records voltage; Then: sampling resistor Rx1=100 Ω * (V1-V2)/(5v-V1), wherein 100 for Pin-1 is provided by the pull-up resistor that provides, and 5V is the VCC supply voltage.
4. a kind of vehicle fuel sample circuit according to claim 1 is characterized in that: described sample circuit is that the V1 value of control module sampling is carried out fault alarm not between 2.059V-4V the time; Sample circuit is that the V2 value of control module sampling is carried out fault alarm not between 0.555V-2.273V the time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104247038A CN102944279A (en) | 2012-10-30 | 2012-10-30 | Automobile fuel sampling circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104247038A CN102944279A (en) | 2012-10-30 | 2012-10-30 | Automobile fuel sampling circuit |
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| Publication Number | Publication Date |
|---|---|
| CN102944279A true CN102944279A (en) | 2013-02-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012104247038A Pending CN102944279A (en) | 2012-10-30 | 2012-10-30 | Automobile fuel sampling circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN106919117A (en) * | 2017-04-25 | 2017-07-04 | 航天科技控股集团股份有限公司 | For automobile instrument water temperature fuel sensor sample circuit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101806607A (en) * | 2010-04-27 | 2010-08-18 | 联合汽车电子有限公司 | Oil level sensor of vehicle |
| CN202002697U (en) * | 2011-03-14 | 2011-10-05 | 重庆矢崎仪表有限公司 | Fuel gauge signal collection circuit |
| CN202083439U (en) * | 2011-04-10 | 2011-12-21 | 黄三元 | Three-wire electronic oil level sensor circuit and device |
| CN102338655A (en) * | 2010-07-22 | 2012-02-01 | 联合汽车电子有限公司 | Vehicle oil level sensor and implementation method thereof |
-
2012
- 2012-10-30 CN CN2012104247038A patent/CN102944279A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101806607A (en) * | 2010-04-27 | 2010-08-18 | 联合汽车电子有限公司 | Oil level sensor of vehicle |
| CN102338655A (en) * | 2010-07-22 | 2012-02-01 | 联合汽车电子有限公司 | Vehicle oil level sensor and implementation method thereof |
| CN202002697U (en) * | 2011-03-14 | 2011-10-05 | 重庆矢崎仪表有限公司 | Fuel gauge signal collection circuit |
| CN202083439U (en) * | 2011-04-10 | 2011-12-21 | 黄三元 | Three-wire electronic oil level sensor circuit and device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN106919117A (en) * | 2017-04-25 | 2017-07-04 | 航天科技控股集团股份有限公司 | For automobile instrument water temperature fuel sensor sample circuit |
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Application publication date: 20130227 |