CN112444308A - Vehicle-mounted oil quantity monitoring fault judgment method - Google Patents
Vehicle-mounted oil quantity monitoring fault judgment method Download PDFInfo
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- CN112444308A CN112444308A CN201910816498.1A CN201910816498A CN112444308A CN 112444308 A CN112444308 A CN 112444308A CN 201910816498 A CN201910816498 A CN 201910816498A CN 112444308 A CN112444308 A CN 112444308A
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000012544 monitoring process Methods 0.000 title claims abstract description 13
- 239000000446 fuel Substances 0.000 claims abstract description 56
- 238000001514 detection method Methods 0.000 claims abstract description 30
- 230000002159 abnormal effect Effects 0.000 claims abstract description 8
- 230000001052 transient effect Effects 0.000 claims abstract description 8
- 239000003921 oil Substances 0.000 description 104
- 239000007788 liquid Substances 0.000 description 9
- 238000004458 analytical method Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 206010039203 Road traffic accident Diseases 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/20—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of apparatus for measuring liquid level
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Abstract
A vehicle-mounted oil quantity monitoring fault judgment method comprises the following steps: 1) calculating oil consumption according to the transient fuel economy signal and the vehicle speed of the vehicle to obtain a first oil consumption curve B; 2) calculating oil consumption according to the detected oil consumption information to obtain a second oil consumption curve C; 3) judging whether the difference value of the two curves is in a preset range, if so, entering the step 6), and if not, entering the normal step; if not, entering 4); 4) if the oil consumption value of the curve B is increased and the oil consumption value of the oil consumption curve C is suddenly changed into an abnormal value and is kept unchanged, the oil quantity detection sensor is in a short circuit or an open circuit; if not, entering 5); 5) if the oil consumption value of the curve B is increased and the oil consumption value of the curve C is kept unchanged for a period of time, the oil quantity detection sensor is blocked and cannot be recovered; 6) and (3) judging whether the difference value is reduced or not and the oil consumption value of the curve C is larger than that of the curve B, if so, reducing the precision of the oil quantity detection sensor, and if not, returning to the step 1). The invention can detect the fault of the oil mass sensor and is easy to realize.
Description
Technical Field
The invention relates to the field of oil mass monitoring, in particular to a vehicle-mounted oil mass monitoring fault judgment method.
Background
With the increase of global energy crisis, the oil price is also increasing continuously, which makes the vehicle operation cost also increasing continuously, how to calculate the accurate oil consumption of the automobile, find out various factors influencing the oil consumption from the accurate oil consumption, reduce the oil consumption better, save the cost, has become the important problem that has to be faced.
The remaining fuel amount is a key information that the driver generally knows via the vehicle instrument and makes a decision whether to refuel. The oil quantity information of the instrument is acquired through signals output by a liquid level sensor installed in an oil tank, and essentially the signals generate corresponding resistance value changes according to the changes of the liquid level and are further converted into voltage changes so as to facilitate the detection of the vehicle-mounted MCU. Therefore, the accuracy of the remaining oil amount information is particularly important, and a serious traffic accident may be caused by wrong information.
Due to the rigor of the vehicle-mounted environment, the floater variable resistance oil quantity sensor has a certain probability of failure, so that the detection and early warning of the failure are particularly important.
Disclosure of Invention
The invention mainly aims to overcome the defects in the prior art, and provides a vehicle-mounted oil quantity monitoring fault judging method which can detect the fault of an oil quantity sensor and is easy to realize.
The invention adopts the following technical scheme:
a vehicle-mounted oil quantity monitoring fault judgment method is characterized by comprising the following steps:
1) calculating oil consumption according to the transient fuel economy signal and the vehicle speed of the vehicle to obtain a first oil consumption curve B;
2) calculating oil consumption according to the oil consumption information detected by the oil quantity detection sensor to obtain a second oil consumption curve C;
3) judging whether the difference value of the first oil consumption curve B and the second oil consumption curve C is in a preset range, if so, enabling the oil quantity detection sensor to be normal, and entering the step 6); if not, entering 4);
4) if the oil consumption value of the first oil consumption curve B is increased and the oil consumption value of the second oil consumption curve C is suddenly changed into an abnormal value and is kept unchanged, the oil quantity detection sensor is in a short circuit or an open circuit; if not, entering 5);
5) if the oil consumption value of the first oil consumption curve B is increased and the oil consumption value of the second oil consumption curve C is kept unchanged for a period of time, the oil quantity detection sensor is blocked and cannot be recovered;
6) and judging whether the difference value is reduced or not and the fuel consumption value of the second fuel consumption curve C is larger than that of the first fuel consumption curve B, if so, reducing the precision of the fuel quantity detection sensor, and if not, returning to the step 1).
Preferably, the abnormal value is a negative value, and in the step 4), if the fuel consumption value of the first fuel consumption curve B is increased and the fuel consumption value of the second fuel consumption curve C is suddenly changed to a negative value and is kept unchanged, the fuel quantity detection sensor is short-circuited to the power supply or opened.
Preferably, if the abnormal value is greater than a preset maximum value, in the step 4), if the fuel consumption value of the first fuel consumption curve B is increased and the fuel consumption value of the second fuel consumption curve C is greater than the preset maximum value and remains unchanged, the fuel quantity detection sensor is short-circuited to the ground or open-circuited.
Preferably, the calculation formula of the first fuel consumption curve B is as follows:
B＝(V1*T1*A1+V2*T2+...+Vn*Tn)/100
Tnfor a certain period of time, AnIs TnTransient fuel economy signal of time period, VnIs TnThe time zone vehicle speed, n, 1, 2, 3 ….
Preferably, the calculation formula of the second fuel consumption curve C is as follows: c ═ C0-Cn，C0For the remaining quantity of oil detected at the initial moment, CnFor a period of time TnThe remaining amount of oil detected thereafter.
As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following advantages:
according to the method, the fuel consumption is calculated according to a transient fuel economy signal and the vehicle speed of a vehicle to obtain a first fuel consumption curve B; the oil consumption is calculated according to the oil consumption information detected by the oil quantity detection sensor to obtain a second oil consumption curve C, the change of the oil consumption values of the two curves is subjected to data comparison analysis, various fault conditions of the oil quantity sensor can be judged in real time according to the analysis result, software is easy to realize, original vehicle parts and circuits do not need to be modified, upgrade of the existing vehicle is easy to realize, development cost is saved, and driving risks are reduced.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a schematic view of a fault determination curve a according to the present invention;
FIG. 3 is a schematic view of a fault determination curve b according to the present invention;
FIG. 4 is a schematic view of a fault determination curve c according to the present invention;
FIG. 5 is a schematic view of a fault determination curve d according to the present invention;
FIG. 6 is a schematic view of a fault determination curve e according to the present invention;
the invention is described in further detail below with reference to the figures and specific examples.
Detailed Description
The invention is further described below by means of specific embodiments.
Referring to fig. 1, a vehicle-mounted oil quantity monitoring fault judgment method includes the following steps:
1) and calculating the oil consumption according to the transient fuel economy signal of the vehicle and the vehicle speed to obtain a first oil consumption curve B, wherein the transient fuel economy signal is the transient hundred kilometer oil consumption Km/L, is derived from an engine ECU (electronic control unit), and CAN be acquired through a CAN (controller area network) bus. Vehicle speed CAN be obtained from a CAN bus or through hard-line detection. The first fuel consumption curve B can be calculated by adopting a general fuel consumption calculation mode. E.g. for a period of time TnFuel consumption in the inner:
B＝(V1*T1*A1+V2*T2+...+Vn*Tn)/100；
Tnfor a certain period of time, AnIs TnTransient fuel economy signal of time period, VnIs TnThe time zone vehicle speed, n, 1, 2, 3 …. The significance of the formula is to calculate the mileage and the oil consumption in one hour periodAnd finally accumulating the total oil consumption in the total time period. The small time period is generally in the millisecond level, so that the vehicle speed and the transient fuel economy can be approximately regarded as fixed values.
2) And calculating the oil consumption according to the oil consumption information detected by the oil quantity detection sensor to obtain a second oil consumption curve C. The oil amount detection sensor may be a float variable resistance oil amount sensor, but is not limited thereto. The float variable resistance oil quantity sensor outputs different resistance values according to different liquid levels, the resistance value is the largest when the liquid level is full, and the resistance value is the smallest when the liquid level is empty. The detection circuit detects corresponding voltage according to a resistance voltage division principle and corresponds to the corresponding liquid level. The remaining amount of oil detected by the float variable resistance oil amount sensor at the initial timing is defined as C0Then a period of time T elapsesnThe remaining oil amount after the last step is defined as CnThe oil consumption in the period is C ═ C0-Cn。
3) And after the calculation result is obtained, comparing and analyzing the oil consumption calculated by the CAN data and the oil consumption value calculated by the floater variable resistance oil mass sensor, and judging the state of the floater variable resistance oil mass sensor according to different data forms. For convenience of description, let TnThe fuel consumption in the time period is depicted by a curve, and is assumed to increase according to a fixed slope, and is certainly a changed slope in practice, and the fault judgment is as follows:
the oil consumption collected by the float variable resistance oil mass sensor is slightly less than the oil consumption calculated through CAN bus data because the oil mass change collected by the float variable resistance oil mass sensor lags behind the oil mass change calculated based on the CAN bus data due to the conduction of the oil pipe and the fluctuation of the oil pressure. Judging whether the difference value between the first fuel consumption curve B and the second fuel consumption curve C is in a preset range, namely, if the difference value fluctuates in a reasonable range, the fuel quantity detection sensor is normal, the normal fuel consumption curve is defined as a fault judgment curve a, referring to fig. 2, and entering step 6); if not, go to 4).
4) And if the oil consumption value of the first oil consumption curve B is increased and the oil consumption value of the second oil consumption curve C is suddenly changed into an abnormal value and is kept unchanged, the oil quantity detection sensor is in a short circuit or an open circuit. It includes two cases:
namely, when the oil consumption value of the first oil consumption curve B calculated by the CAN bus data is increased, the oil consumption value of the second oil consumption curve collected by the float variable resistance oil mass sensor is suddenly changed into a negative value and is kept unchanged. It can be determined that the float variable-resistance oil amount sensor is short-circuited to the power supply or the passive output signal type float variable-resistance oil amount sensor is open-circuited, resulting in the oil amount detection circuit based on the resistance voltage division detecting the maximum voltage value corresponding to the maximum liquid level or exceeding the maximum liquid level range. The instantaneous fuel consumption becomes negative and remains constant. This short-circuited fuel consumption curve to the power supply is defined as the fault decision curve b, see fig. 3.
When the oil consumption value of the first oil consumption curve B calculated by the CAN bus data is increased, the oil consumption value acquired by the float variable resistance oil mass sensor is suddenly changed into a maximum value and is kept unchanged. It can be judged that the float variable-resistance oil amount sensor is short-circuited to the ground or the active output signal type float variable-resistance oil amount sensor is open, resulting in the oil amount detection circuit based on the resistance voltage division detecting the minimum voltage value corresponding to the empty level or exceeding the minimum level range. The instantaneous fuel consumption is therefore abruptly changed to a maximum value and is maintained at all times. This short-to-ground fuel consumption curve is defined as the fault decision curve c, see fig. 4.
If not, go to 5).
5) When the oil consumption value of the first oil consumption curve B calculated by the CAN bus data is increased, the oil consumption value of the second oil consumption curve C acquired by the float variable resistance oil mass sensor is kept unchanged for a period of time. Then it can be judged that the float variable resistance oil quantity sensor is stuck and cannot be recovered, so that the acquired voltage value is not changed, and the oil consumption is not increased. Defined as a failure judgment curve d, see fig. 5.
The float variable resistance oil quantity sensor is provided with a floatable part and a resistance part, and the floatable part is positioned at different positions and outputs different resistance values when different liquid levels are detected. When the floating part is corroded and attached by impurities or other substances in the gasoline, the floating part can be clamped on the wall of the sensor tube to cause clamping stagnation. If a sensor with a link rotation type is used, the joints of the rotating part may be corroded and stuck.
6) And when the fault judgment curve e is met, storing the data, performing timing judgment, and analyzing the historical data after a certain time length is reached. Once the resistance value of the float variable resistance oil quantity sensor is increased due to fuel oil corrosion and abrasion, the difference value is gradually reduced until the oil consumption value of the second oil consumption curve C is larger than that of the first oil consumption curve B calculated by the CAN bus data. Then, by judging whether the difference is reduced or not and the fuel consumption value of the second fuel consumption curve C is larger than that of the first fuel consumption curve B, if so, the accuracy of the fuel quantity detection sensor is reduced, and under the idle working condition, the error of fuel quantity detection can be corrected by using the characteristic. Referring to fig. 6, in this case, a failure determination curve e is defined. If not, returning to the step 1).
The invention detects the working state of the float variable resistance oil mass sensor in real time through data analysis, can be compatible with the original hardware circuit, has simple and effective method, can judge the faults of various sensors in real time, saves the development cost and reduces the driving risk.
The above description is only an embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using the design concept should fall within the scope of infringing the present invention.
Claims (5)
1. A vehicle-mounted oil quantity monitoring fault judgment method is characterized by comprising the following steps:
1) calculating oil consumption according to the transient fuel economy signal and the vehicle speed of the vehicle to obtain a first oil consumption curve B;
2) calculating oil consumption according to the oil consumption information detected by the oil quantity detection sensor to obtain a second oil consumption curve C;
3) judging whether the difference value of the first oil consumption curve B and the second oil consumption curve C is in a preset range, if so, enabling the oil quantity detection sensor to be normal, and entering the step 6); if not, entering 4);
4) if the oil consumption value of the first oil consumption curve B is increased and the oil consumption value of the second oil consumption curve C is suddenly changed into an abnormal value and is kept unchanged, the oil quantity detection sensor is in a short circuit or an open circuit; if not, entering 5);
5) if the oil consumption value of the first oil consumption curve B is increased and the oil consumption value of the second oil consumption curve C is kept unchanged for a period of time, the oil quantity detection sensor is blocked and cannot be recovered;
6) and judging whether the difference value is reduced or not and the fuel consumption value of the second fuel consumption curve C is larger than that of the first fuel consumption curve B, if so, reducing the precision of the fuel quantity detection sensor, and if not, returning to the step 1).
2. The vehicle-mounted oil quantity monitoring fault judgment method according to claim 1, wherein the abnormal value is a negative value, and in the step 4), if the oil consumption value of the first oil consumption curve B is increased and the oil consumption value of the second oil consumption curve C is suddenly changed to a negative value and is kept unchanged, the oil quantity detection sensor is short-circuited to a power supply or is open-circuited.
3. The vehicle-mounted fuel quantity monitoring fault judgment method according to claim 1, wherein if the abnormal value is greater than a preset maximum value, in the step 4), if the fuel consumption value of the first fuel consumption curve B is increased and the fuel consumption value of the second fuel consumption curve C is greater than the preset maximum value and is kept unchanged, the fuel quantity detection sensor is short-circuited to the ground or open-circuited.
4. The vehicle-mounted oil quantity monitoring fault judgment method according to claim 1, wherein the calculation formula of the first oil consumption curve B is as follows:
B＝(V1*T1*A1+V2*T2+...+Vn*Tn)/100
Tnfor a certain period of time, AnIs TnTransient fuel economy signal of time period, VnIs TnTime zone vehicle speed, n being 1, 2, 3 …。
5. The vehicle-mounted oil quantity monitoring fault judgment method according to claim 1, wherein a calculation formula of the second oil consumption curve C is as follows: c ═ C0-Cn，C0For the remaining quantity of oil detected at the initial moment, CnFor a period of time TnThe remaining amount of oil detected thereafter.
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| CN113844434A (en) * | 2021-11-11 | 2021-12-28 | 无锡城市职业技术学院 | Hybrid electric vehicle control method based on sensor fault tolerance |
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| CN113844434A (en) * | 2021-11-11 | 2021-12-28 | 无锡城市职业技术学院 | Hybrid electric vehicle control method based on sensor fault tolerance |
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