CN202869572U - Fuel oil sampling circuit - Google Patents
Fuel oil sampling circuit Download PDFInfo
- Publication number
- CN202869572U CN202869572U CN 201220563821 CN201220563821U CN202869572U CN 202869572 U CN202869572 U CN 202869572U CN 201220563821 CN201220563821 CN 201220563821 CN 201220563821 U CN201220563821 U CN 201220563821U CN 202869572 U CN202869572 U CN 202869572U
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- fuel
- fuel oil
- pin
- sampling
- value
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Abstract
The utility model discloses a fuel oil sampling circuit. The fuel oil sampling circuit is characterized in that a center connection point of a fuel oil sensor is connected with the ground through resistance, and voltage sampling V1 and voltage sampling V2 are respectively conducted by PIN-1 and PIN-2 at two ends of the fuel oil sensor and are respectively conveyed to a control unit. Due to the fact that a circuit structure is adopted, the fuel oil sampling circuit has the advantages of being accurate in sampling value of the fuel oil sensor, capable of giving an alarm in time when the sampling value loses efficacy, simple in circuit structure and low in production cost.
Description
Technical field
The utility model relates to the sampling of vehicle fuel, particularly a kind of fuel oil 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.
The utility model content
Technical problem to be solved in the utility model is to provide a kind of fuel oil sample circuit, to reach the more accurate purpose of sampled value.
For achieving the above object, the technical solution of the utility model is, a kind of fuel oil 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 fuel oil sample circuit, owing to adopting above-mentioned circuit structure, the utility model has the advantage of: 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
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail;
Fig. 1 is the circuit diagram of a kind of fuel oil sample circuit of the utility model;
Embodiment
The utility model is introduced 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 utility model 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.
The utility model intermediate fuel oil sensor live part resistance variations scope Rx1 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.
The utility model testing result 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 utility model by reference to the accompanying drawings; obviously the utility model specific implementation is not subjected to the restriction of aforesaid way; as long as the various improvement of having adopted technical solutions of the utility model to carry out; or directly apply to other occasion without improvement, all within protection domain of the present utility model.
Claims (3)
1. fuel oil 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 fuel oil 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.
3. a kind of fuel oil sample circuit according to claim 1 is characterized in that: described sample circuit is that the V1 value of control module sampling is between 2.059V-4V; Sample circuit is that the V2 value of control module sampling is between 0.555V-2.273V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220563821 CN202869572U (en) | 2012-10-30 | 2012-10-30 | Fuel oil sampling circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220563821 CN202869572U (en) | 2012-10-30 | 2012-10-30 | Fuel oil sampling circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202869572U true CN202869572U (en) | 2013-04-10 |
Family
ID=48036285
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220563821 Expired - Fee Related CN202869572U (en) | 2012-10-30 | 2012-10-30 | Fuel oil sampling circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202869572U (en) |
-
2012
- 2012-10-30 CN CN 201220563821 patent/CN202869572U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130410 Termination date: 20151030 |
|
| EXPY | Termination of patent right or utility model |