CN107884023B - Fuel gauge test circuit, device and method - Google Patents
Fuel gauge test circuit, device and method Download PDFInfo
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- CN107884023B CN107884023B CN201710914945.8A CN201710914945A CN107884023B CN 107884023 B CN107884023 B CN 107884023B CN 201710914945 A CN201710914945 A CN 201710914945A CN 107884023 B CN107884023 B CN 107884023B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/80—Arrangements for signal processing
- G01F23/802—Particular electronic circuits for digital processing equipment
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Abstract
The invention discloses a fuel gauge test circuit, which comprises a switch K1, a pull-up resistor R1 and a fuel sensor Rx, wherein the switch K1 is connected with the pull-up resistor R1; the testing device of the fuel gauge testing circuit comprises a power consumption control module (2), a compensation AD value acquisition module (3), a sensor AD value acquisition module (4) and a processor (1); in addition, a fuel test method of the fuel meter test device is also disclosed. The fuel gauge test circuit, the device and the method of the invention utilize the acquisition precision of the fuel sensor to receive the Analog to Digital (AD), and improve the data acquisition precision of the fuel sensor.
Description
Technical Field
The invention relates to the technical field of automobile fuel meters, in particular to a fuel meter testing circuit, a device and a method.
Background
Fuel signals in the whole automobile are only used by an instrument, in order to save cost, the sensor signals are directly connected into the instrument under most conditions when the whole automobile is designed and installed, signal preprocessing of a Body Controller (BCM) is not carried out, and the instrument directly collects data of the fuel sensor and displays the data through internal processing. Although the scheme without BCM processing saves cost, it brings a series of problems: a reference voltage source is not used, so that the data acquisition precision of the fuel sensor is reduced; if the acquisition precision is to be improved, a high-precision power supply and a reference voltage reference need to be used, and the cost of the product is increased.
Disclosure of Invention
The invention solves the technical problem of providing a fuel gauge testing circuit, a device and a method, which improve the data acquisition precision of a fuel sensor by utilizing the acquisition precision of the fuel sensor to receive an Analog to Digital (AD).
In order to achieve the purpose, the invention provides a fuel gauge testing circuit, which comprises a switch K1, a pull-up resistor R1 and a fuel sensor Rx, wherein the switch K1, the pull-up resistor R1 and the fuel sensor Rx are connected in series, the switch K1 is connected with a power supply, and the fuel sensor Rx is grounded; two ends of the pull-up resistor R1 are connected with a compensation voltage test circuit, and a resistor R3 and a capacitor C3 which have a filtering function are connected in the compensation voltage test circuit; the fuel sensor Rx is characterized in that two ends of the fuel sensor Rx are connected with a sensor voltage test circuit, and a resistor R2 and a capacitor C2 which have a filtering effect are connected in the sensor voltage test circuit.
Further, the switch K1 is a relay.
In addition, the invention also provides a fuel gauge testing device, which comprises a compensation AD value acquisition module, a sensor AD value acquisition module and a processor; the processor is respectively connected with the compensation AD value acquisition module and the sensor AD value acquisition module; the compensation AD value acquisition module is used for acquiring AD values at two ends of a pull-up resistor R1, the sensor AD value acquisition module is used for acquiring AD values at two ends of a fuel sensor Rx, and the processor is used for controlling the compensation AD value acquisition module and the sensor AD value acquisition module to work and calculating the AD values acquired by the compensation AD value acquisition module and the sensor AD value acquisition module.
The fuel gauge testing device comprises a processor, a power consumption control module and a power consumption control module, wherein the processor is connected with the power consumption control module and controls the power consumption control module to work, and the power consumption control module is used for supplying power to the whole fuel gauge testing device.
In addition, the invention also provides a fuel quantity testing method by using the fuel gauge testing device, which comprises the following steps:
s1, an opening switch K1;
s2, a sensor AD value acquisition module (4) acquires AD values AD2 at two ends of a fuel sensor Rx;
s3, the compensation AD value acquisition module (3) acquires AD values AD3 at two ends of a pull-up resistor R1;
s4, the processor (1) calculates the resistance value of Rx according to the algorithm formula of Rx.
Further, the algorithm formula of Rx is
。
Further, the formula
The derivation process is as follows:
the voltage U2 across the fuel sensor Rx is calculated as:
(formula one), where Δ is the maximum digital value of AD resolution, Uref is the reference voltage;
the voltage U3 across pull-up resistor R1 is calculated as:
(equation two), where Δ is the maximum digital value of AD resolution, Uref is the reference voltage;
the following conversion relationship exists between U2 and U3:
(formula three);
substituting the first formula and the second formula into the third formula
。
Furthermore, the step S2 has a delay, and the delay time is 15 ms-30 ms.
Further, the delay time of step S2 is 20 ms.
Further, the switch K1 is turned on for a period of 30 s.
The beneficial effects realized by the invention mainly comprise the following points: the fuel gauge testing circuit is provided with a compensation voltage testing circuit, the fuel gauge testing device is provided with a compensation AD value acquisition module, the voltage at two ends of a pull-up resistor R1 can be directly tested or calculated to calculate the Rx resistance value of the fuel sensor, the Rx resistance value of the fuel sensor does not need to be directly calculated by adopting power supply voltage calculation, and the inaccuracy of the Rx resistance value of the fuel sensor caused by low power supply precision can be avoided; the filter circuit is added, so that the voltage at two ends of R1 and the voltage at two ends of a fuel sensor Rx or the AD value collected by the compensation AD value collection module and the sensor AD value collection module are tested more accurately, and the finally calculated residual fuel value of the fuel tank is more accurate; the Rx resistance value calculation formula is used for equivalent substitution, so that the influence of the precision of the reference voltage Uref is avoided, and the influence on the running speed caused by the fact that the controller needs to carry out multiply-divide operation for many times, the load of a processor is increased is avoided; the fuel quantity testing method of the fuel gauge testing device is provided with a delay step, and the pull-up resistor R1 and the fuel sensor Rx are stabilized through the delay step, so that the testing result is more accurate.
Drawings
FIG. 1 is a schematic circuit diagram of a fuel gauge testing apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic block diagram of a fuel gauge testing apparatus according to a second embodiment of the present invention;
FIG. 3 is a schematic flow chart of a fuel gauge testing method in the third embodiment of the present invention;
fig. 4 is a diagram illustrating a relationship between the remaining fuel amount in the fuel tank and the resistance of the fuel sensor Rx according to a third embodiment of the present invention.
Description of reference numerals: the device comprises a processor 1, a power consumption control module 2, a compensation AD value acquisition module 3 and a sensor AD value acquisition module 4.
The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted; the same or similar reference numerals correspond to the same or similar parts; the terms describing positional relationships in the drawings are for illustrative purposes only and are not to be construed as limiting the patent.
Detailed Description
In order to facilitate understanding for those skilled in the art, the present invention will be described in further detail with reference to the accompanying drawings and examples.
Example one
Referring to fig. 1, the fuel gauge testing circuit comprises a switch K1, a pull-up resistor R1 and a fuel sensor Rx, wherein the switch K1, the pull-up resistor R1 and the fuel sensor Rx are connected in series, the switch K1 is connected with a power supply, the fuel sensor Rx is grounded, and therefore the switch K1, the pull-up resistor R1 and the fuel sensor Rx are connected in series to form a loop. The switch K1 is a relay-made switch.
The two ends of a pull-up resistor R1 are connected with a compensation voltage test circuit, a resistor R3 and a capacitor C3 are connected in series and then connected in parallel with the pull-up resistor R1, the resistor R3 and the capacitor C3 form a filter circuit, and the filter circuit enables the collected voltage at the two ends of the pull-up resistor R1, namely the AD value AD3 at the two ends of the pull-up resistor R1, to be more accurate; the fuel sensor Rx is characterized in that sensor voltage testing circuits are connected to two ends of the fuel sensor Rx, a resistor R2 and a capacitor C2 are connected in series and then connected with the fuel sensor Rx in parallel, and a filter circuit is formed by the resistor R2 and the capacitor C2 and passes through the filter circuit. The filter circuit enables the acquired voltage at two ends of the fuel sensor Rx, namely the AD value AD2 at two ends of the fuel sensor Rx, to be more accurate.
When the fuel cell system works, the switch K1, the pull-up resistor R1 and the fuel sensor Rx form a series circuit, the power supply voltage is clamped on the pull-up resistor R1 and the fuel sensor Rx, and the voltage U3 at two ends of the pull-up resistor R1 can be tested through a compensation voltage test circuit at two ends of the pull-up resistor R1 or the voltage U3 at two ends of the pull-up resistor R1 is indirectly calculated through testing the AD value AD3 at two ends of the pull-up resistor R1; similarly, the voltage U2 across the fuel sensor Rx can be tested by a sensor voltage test line across the fuel sensor Rx or the voltage U2 across the fuel sensor Rx can be indirectly calculated by testing the AD value AD2 of the fuel sensor Rx.
Because the resistance value of the pull-up resistor R1 is known, and the fuel sensor Rx and the pull-up resistor R1 are connected in series in the circuit, the resistance value of the fuel sensor Rx can be calculated through the measured voltage U2 at the two ends of the fuel sensor Rx and the measured voltage U3 at the two ends of the pull-up resistor R1, so that the fuel quantity value in the fuel tank can be obtained through the corresponding relation between the size of the fuel sensor Rx and the fuel quantity in the fuel tank of the automobile and displayed on an instrument of the automobile.
In the embodiment, the resistance value of the fuel sensor Rx is calculated by directly testing or calculating the voltage at the two ends of the pull-up resistor R1, and the resistance value of the fuel sensor Rx is not calculated by directly adopting power supply voltage calculation, so that the inaccuracy of the resistance value calculation of the fuel sensor Rx caused by low power supply precision can be avoided; in addition, a filter circuit is added in the embodiment, so that the voltage at two ends of the R1 and the voltage test or AD value test at two ends of the fuel sensor Rx are more accurate.
Example two
Referring to fig. 2, the fuel gauge testing device includes a power consumption control module 2, a compensation AD value acquisition module 3, a sensor AD value acquisition module 4, and a processor 1, where the processor 1 is connected to the power consumption control module 2, the compensation AD value acquisition module 3, and the sensor AD value acquisition module 4, respectively.
During operation, the processor 1 is used for controlling the compensation AD value acquisition module 3 and the sensor AD value acquisition module 4 to work. The power consumption control module 2 is used for supplying power to the whole fuel gauge testing device; the compensation AD value acquisition module 3 is connected with a compensation voltage test circuit at two ends of a pull-up resistor R1 and acquires an AD value AD3 at two ends of a pull-up resistor R1; the sensor AD value acquisition module 4 is connected with sensor voltage test circuits at two ends of a fuel sensor Rx and acquires AD values AD2 at two ends of the fuel sensor Rx; the processor 1 obtains the resistance value of Rx by using the AD3 acquired by the operation compensation AD value acquisition module 3 and the AD2 acquired by the sensor AD value acquisition module 4, so that the fuel quantity value in the fuel tank is obtained according to the corresponding relation between the size of the fuel sensor Rx and the fuel quantity in the fuel tank of the automobile and is displayed on an instrument of the automobile.
EXAMPLE III
Referring to fig. 3, a fuel quantity testing method of a fuel gauge testing device includes the following steps:
s1, opening the switch K1, wherein the opening period is 30S, namely the switch K1 is opened once every 30S, and the subsequent steps are completed after the switch K1 is opened until the switch K1 is completely closed in the subsequent steps;
s2, the sensor AD value acquisition module 4 acquires AD values AD2 at two ends of a fuel sensor Rx, delay exists in the step, the delay time is 15-30 ms, preferably 20ms, and a pull-up resistor R1 and the fuel sensor Rx are stable through delay, so that the test result is more accurate;
s3, the compensation AD value acquisition module 3 acquires AD values AD3 at two ends of the pull-up resistor R1;
s4, processor 1 according to algorithm formula of fuel sensor Rx
The resistance of Rx is calculated.
Algorithm formula of fuel sensor Rx
The derivation process of (1) is as follows:
the voltage U2 across the fuel sensor Rx is calculated as:
(equation one), where Δ is the maximum digital value of AD resolution, UrefIs a reference voltage;
the voltage U3 across pull-up resistor R1 is calculated as:
(equation two), where Δ is the maximum digital value of AD resolution, UrefIs a reference voltage;
the following conversion relationship exists between U2 and U3:
(formula three);
substituting the first formula and the second formula into the third formula
The simplified calculation formula for obtaining the resistance value of the fuel sensor Rx is as follows:
。
the resistance value of the fuel sensor Rx is obtained through the above steps, so that the fuel amount value in the fuel tank is obtained through the correspondence relationship between the size of the fuel sensor Rx and the fuel amount in the fuel tank of the automobile and is displayed on the meter of the automobile, for example, the fuel amount remaining in the fuel tank can be obtained through the correspondence relationship between the fuel amount remaining in the fuel tank and the resistance value of the fuel sensor Rx in fig. 4 and table 1.
TABLE 1, a corresponding relation table of residual fuel quantity of fuel tank and Rx resistance of fuel sensor
| Rx resistance/omega | 25 | 40 | 65 | 90 | 117 | 230 |
| Residual oil amount/ |
50 | 40 | 30 | 20 | 10 | 3 |
The foregoing is a detailed description of the invention, which is described in greater detail and not intended to limit the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications are possible without departing from the inventive concept, and such obvious alternatives fall within the scope of the invention.
Claims (7)
1. A fuel gauge test circuit, its characterized in that: the fuel oil sensor comprises a switch K1, a pull-up resistor R1 and a fuel oil sensor Rx, wherein the switch K1, the pull-up resistor R1 and the fuel oil sensor Rx are connected in series, the switch K1 is connected with a power supply, and the fuel oil sensor Rx is grounded; two ends of the pull-up resistor R1 are connected with a compensation voltage test circuit, and a resistor R3 and a capacitor C3 which have a filtering function are connected in the compensation voltage test circuit; the fuel sensor Rx is characterized in that two ends of the fuel sensor Rx are connected with a sensor voltage test circuit, and a resistor R2 and a capacitor C2 which have a filtering effect are connected in the sensor voltage test circuit; the switch K1 is a relay.
2. A test device for the fuel gauge test circuit of claim 1, characterized by: the device comprises a compensation AD value acquisition module (3), a sensor AD value acquisition module (4) and a processor (1); the processor (1) is respectively connected with the compensation AD value acquisition module (3) and the sensor AD value acquisition module (4); the compensation AD value acquisition module (3) is used for acquiring AD values at two ends of a pull-up resistor R1, the sensor AD value acquisition module (4) is used for acquiring AD values at two ends of a fuel sensor Rx, and the processor (1) is used for controlling the compensation AD value acquisition module (3) and the sensor AD value acquisition module (4) to work and calculating the AD values acquired by the compensation AD value acquisition module (3) and the sensor AD value acquisition module (4); the fuel gauge testing device is characterized by further comprising a power consumption control module (2), the processor (1) is connected with the power consumption control module (2) and controls the power consumption control module (2) to work, and the power consumption control module (2) is used for supplying power to the whole fuel gauge testing device.
3. A fuel test method of a fuel gauge testing arrangement as claimed in claim 2, comprising the steps of:
s1, an opening switch K1;
s2, a sensor AD value acquisition module (4) acquires AD values AD2 at two ends of a fuel sensor Rx;
s3, the compensation AD value acquisition module (3) acquires AD values AD3 at two ends of a pull-up resistor R1;
s4, the processor (1) calculates the resistance value of Rx according to the algorithm formula of Rx;
and step S2, delay exists, and the delay time is 15 ms-30 ms.
4. The fuel gauge testing method of claim 3, characterized in that: the Rx algorithm is expressed as
。
5. The fuel gauge testing method of claim 4, characterized in that: formula (II)
The derivation process is as follows:
the voltage U2 across the fuel sensor Rx is calculated as:
(equation one), where Δ is the maximum digital value of AD resolution, UrefIs a reference voltage;
the voltage U3 across pull-up resistor R1 is calculated as:
(equation two), where Δ is the maximum digital value of AD resolution, UrefIs a reference voltage;
the following conversion relationship exists between U2 and U3:
(formula three);
substituting the first formula and the second formula into the third formula
。
6. The fuel gauge testing method of claim 5, characterized in that: the delay time of step S2 is 20 ms.
7. The fuel gauge testing method of claim 3, characterized in that: the switch K1 is opened for 30 s.
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| CN201710914945.8A CN107884023B (en) | 2017-09-30 | 2017-09-30 | Fuel gauge test circuit, device and method |
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|---|---|---|---|
| CN201710914945.8A CN107884023B (en) | 2017-09-30 | 2017-09-30 | Fuel gauge test circuit, device and method |
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| CN107884023A CN107884023A (en) | 2018-04-06 |
| CN107884023B true CN107884023B (en) | 2020-10-16 |
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| CN109540254A (en) * | 2018-10-10 | 2019-03-29 | 惠州市德赛西威汽车电子股份有限公司 | A kind of fuel oil for vehicles overmeasure computation method based on voltage ratio |
| CN113124953A (en) * | 2020-01-16 | 2021-07-16 | 广州汽车集团股份有限公司 | Metering method and device for displaying oil amount in automobile fuel gauge and related equipment |
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| CN201060548Y (en) * | 2007-06-28 | 2008-05-14 | 上海德科电子仪表有限公司 | Improved circuit for improving A/D sampling precision 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 |
| KR20120006700A (en) * | 2010-07-13 | 2012-01-19 | 콘티넨탈 오토모티브 시스템 주식회사 | Apparatus for processing input signal of sensor |
| CN204330079U (en) * | 2014-12-31 | 2015-05-13 | 北京圣庄科技有限公司 | A kind of conductivity sensor circuit for measuring oil tank internal liquid level |
| CN106092358A (en) * | 2016-06-13 | 2016-11-09 | 潍柴动力股份有限公司 | A kind for the treatment of method and apparatus of resistance sensor signal |
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2017
- 2017-09-30 CN CN201710914945.8A patent/CN107884023B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2646907A1 (en) * | 1989-05-09 | 1990-11-16 | Jaeger | Device for measuring the level and/or volume of liquid in a tank |
| CN201060548Y (en) * | 2007-06-28 | 2008-05-14 | 上海德科电子仪表有限公司 | Improved circuit for improving A/D sampling precision of vehicle |
| KR20120006700A (en) * | 2010-07-13 | 2012-01-19 | 콘티넨탈 오토모티브 시스템 주식회사 | Apparatus for processing input signal of sensor |
| CN202002697U (en) * | 2011-03-14 | 2011-10-05 | 重庆矢崎仪表有限公司 | Fuel gauge signal collection circuit |
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