CN114435266B - Fault diagnosis method and device for oil level sensor - Google Patents
Fault diagnosis method and device for oil level sensor Download PDFInfo
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- CN114435266B CN114435266B CN202011195172.0A CN202011195172A CN114435266B CN 114435266 B CN114435266 B CN 114435266B CN 202011195172 A CN202011195172 A CN 202011195172A CN 114435266 B CN114435266 B CN 114435266B
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- 238000003745 diagnosis Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000000446 fuel Substances 0.000 claims abstract description 58
- 238000009825 accumulation Methods 0.000 claims description 12
- 239000007788 liquid Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000002828 fuel tank Substances 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
- B60R16/0231—Circuits relating to the driving or the functioning of the vehicle
- B60R16/0232—Circuits relating to the driving or the functioning of the vehicle for measuring vehicle parameters and indicating critical, abnormal or dangerous conditions
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Mechanical Engineering (AREA)
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Abstract
The embodiment of the application discloses a fault diagnosis method and device for an oil level sensor, wherein the method comprises the following steps: acquiring the voltage of the oil level sensor when the absolute value of the first difference value between the oil level signal variation and the accumulated fuel consumption is larger than a first preset value; judging whether the voltage of the oil level sensor is within a preset voltage range; if so, acquiring a second difference value between the highest value of the oil level signal and the lowest value of the oil level signal in the first preset time; and if the second difference value is larger than a second preset value, determining that the oil level sensor has signal interference faults. Therefore, by the method provided by the embodiment of the application, the signal interference faults of the oil level sensor can be accurately diagnosed, the fault with unreasonable signals can be prevented from being misdiagnosed, the diagnosis accuracy is improved, the user is helped to accurately identify the faults, and the working efficiency is improved.
Description
Technical Field
The present disclosure relates to the field of vehicle control, and in particular, to a method and apparatus for diagnosing a fault of an oil level sensor.
Background
At present, in the prior art, fault diagnosis is generally carried out on an oil level sensor by calculating the difference value of the accumulated fuel consumption and the oil level signal variation, and when the difference value is higher than a diagnosis threshold value and the oil level signal variation is higher than a calibration threshold value, unreasonable fault of a signal is reported.
Due to the influence of the arrangement of the vehicle fuel tank, severe fluctuations in the fuel level can occur under extreme conditions (e.g. high-loop, inclined, bumpy road surfaces), which can lead to misdiagnosis of unreasonable signals.
Disclosure of Invention
In order to solve the technical problems, the application provides the oil level sensor fault diagnosis method and the oil level sensor fault diagnosis device, which can accurately diagnose the oil level sensor signal interference fault, avoid misdiagnosis of the signal unreasonable fault, improve the diagnosis accuracy, help the user to accurately identify the fault and improve the working efficiency.
The embodiment of the application discloses the following technical scheme:
in a first aspect, an embodiment of the present application provides a fault diagnosis method for an oil level sensor, including:
acquiring the voltage of the oil level sensor when the absolute value of the first difference value between the oil level signal variation and the accumulated fuel consumption is larger than a first preset value;
judging whether the voltage of the oil level sensor is within a preset voltage range;
if so, acquiring a second difference value between the highest value of the oil level signal and the lowest value of the oil level signal in the first preset time;
and if the second difference value is larger than a second preset value, determining that the oil level sensor has signal interference faults.
Optionally, the preset voltage range is defined by a low voltage threshold and a high voltage threshold, the method further comprising:
if the oil level sensor voltage is smaller than the low voltage threshold value, determining that the oil level sensor has a low voltage fault;
and if the oil level sensor voltage is greater than the high voltage threshold, determining that the oil level sensor has a high voltage fault.
Optionally, the method further comprises:
and when the voltage of the oil level sensor is in a preset voltage range, if the second difference value is smaller than a third preset value, the third preset value is smaller than the second preset value, the accumulated fuel consumption is larger than a fourth preset value, and the fourth preset value is larger than the third preset value, determining that the oil level sensor has a signal clamping stagnation fault.
Optionally, before the second difference is obtained, the method further includes:
determining that the vehicle speed is zero; or alternatively, the first and second heat exchangers may be,
and determining that the vehicle speed is not zero, wherein the vehicle speed is in a first preset range, the steering angle of the vehicle steering wheel is in a second preset range, and the load of the vehicle is in a third preset range.
Optionally, the accumulated fuel consumption is calculated as follows: the accumulation is started after the engine is operated, and if any one of fault clearing by using a general diagnostic instrument, resetting by an Electronic Control Unit (ECU) of the engine and fault diagnosis completion of the signal clamping stagnation of the oil level sensor occurs, the accumulated fuel consumption is cleared, and the accumulation is restarted.
In a second aspect, an embodiment of the present application provides an oil level sensor fault diagnosis apparatus, including:
an oil level sensor voltage acquisition unit for acquiring an oil level sensor voltage when an absolute value of a first difference between the oil level signal variation and the accumulated fuel consumption is greater than a first preset value;
a judging unit for judging whether the oil level sensor voltage is within a preset voltage range;
a second difference value obtaining unit, configured to obtain a second difference value between a highest value of the oil level signal and a lowest value of the oil level signal in a first preset time when the voltage of the oil level sensor is within a preset voltage range;
and the signal interference fault determining unit is used for determining the signal interference fault of the oil level sensor when the second difference value is larger than a second preset value.
Optionally, the preset voltage range is defined by a low voltage threshold and a high voltage threshold, the device further comprising:
a low voltage fault determining unit configured to determine that the oil level sensor has a low voltage fault when the oil level sensor voltage is less than the low voltage threshold;
and the high-voltage fault determining unit is used for determining that the oil level sensor has a high-voltage fault when the voltage of the oil level sensor is larger than the high-voltage threshold value.
Optionally, the apparatus further includes:
and the signal clamping stagnation fault determining unit is used for determining that the oil level sensor has the signal clamping stagnation fault if the second difference value is smaller than a third preset value when the voltage of the oil level sensor is in a preset voltage range, the third preset value is smaller than the second preset value, the accumulated fuel consumption is larger than a fourth preset value, and the fourth preset value is larger than the third preset value.
Optionally, before the second difference is obtained, the method further includes:
a vehicle state determining unit configured to determine that a vehicle speed is zero; or the vehicle speed is determined to be non-zero, the vehicle speed is in a first preset range, the steering wheel angle of the vehicle is in a second preset range, and the load of the vehicle is in a third preset range.
Optionally, the accumulated fuel consumption is calculated as follows: the accumulation is started after the engine is operated, and if any one of fault clearing by using a general diagnostic instrument, resetting by an Electronic Control Unit (ECU) of the engine and fault diagnosis completion of the signal clamping stagnation of the oil level sensor occurs, the accumulated fuel consumption is cleared, and the accumulation is restarted.
According to the technical scheme, compared with the prior art, the embodiment of the application has the following advantages:
by using the method provided by the embodiment of the application, when the absolute value of the first difference value between the oil level signal variation and the accumulated fuel consumption is larger than a first preset value, the voltage of the oil level sensor can be obtained; judging whether the voltage of the oil level sensor is within a preset voltage range; if so, acquiring a second difference value between the highest value of the oil level signal and the lowest value of the oil level signal in the first preset time; and if the second difference value is larger than a second preset value, determining that the oil level sensor has signal interference faults. Therefore, by the method provided by the embodiment of the application, the signal interference faults of the oil level sensor can be accurately diagnosed, the fault with unreasonable signals can be prevented from being misdiagnosed, the diagnosis accuracy is improved, the user is helped to accurately identify the faults, and the working efficiency is improved. .
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a fault diagnosis method of an oil level sensor provided in an embodiment of the present application;
fig. 2 is a schematic diagram of an oil level sensor fault diagnosis device according to an embodiment of the present application.
Detailed Description
In order to make the present invention better understood by those skilled in the art, the following description will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The inventor of the application finds that, at present, the prior art generally performs fault diagnosis on the oil level sensor by calculating the difference value between the accumulated fuel consumption and the oil level signal variation, and when the difference value is higher than a diagnosis threshold value and the oil level signal variation is greater than a calibration threshold value, a signal unreasonable fault is reported.
Due to the influence of the arrangement of the vehicle fuel tank, severe fluctuations in the fuel level can occur under extreme conditions (e.g. high-loop, inclined, bumpy road surfaces), which can lead to misdiagnosis of unreasonable signals.
In order to solve the problems, in the embodiment of the application, the fault diagnosis method and device for the oil level sensor are provided, so that the signal interference fault of the oil level sensor can be accurately diagnosed, the fault with unreasonable signal due to misdiagnosis is avoided, the diagnosis accuracy is improved, the user is helped to accurately identify the fault, and the working efficiency is improved. .
Various non-limiting embodiments of the present application are described in detail below with reference to the attached drawing figures.
Exemplary method
Referring to fig. 1, a flow chart of a fault diagnosis method for an oil level sensor according to an embodiment of the present invention is provided. As shown in fig. 1, may include:
s101, acquiring the voltage of the oil level sensor when the absolute value of the first difference value between the oil level signal variation and the accumulated fuel consumption is larger than a first preset value.
In this embodiment of the present application, the oil level signal variation refers to a difference between an oil level highest value and an oil level lowest value, which are monitored by the oil level sensor in a period of time, and it should be noted that the present application does not specifically limit the period of time, and a user may set the difference between the oil level highest value and the oil level lowest value, which are monitored by the oil level sensor, as the oil level signal variation, according to an actual situation, for example, by running a vehicle for one week.
The accumulated fuel consumption refers to the actual consumption of fuel in a period of time, and when the change in the fuel level signal is compared with the accumulated fuel consumption, in theory, when the fuel level sensor is in normal operation, the change in the fuel level signal and the accumulated fuel consumption are equal in value in the same period of time, however, in actual operation, because of the influence of various factors, there is a certain error in the measurement process of the fuel level sensor, as long as the error is in a reasonable range, the fuel level sensor can still be considered to be in normal operation, that is, when the absolute value of the first difference between the change in the fuel level signal and the accumulated fuel consumption is less than or equal to the first preset value, the signal monitored by the fuel level sensor can still be considered to be normal without faults. It should be noted that, the first preset value may be set by the user according to the actual situation, which is not limited herein.
When the absolute value of the first difference between the oil level signal variation and the accumulated fuel consumption is larger than a first preset value, the oil level sensor is considered to have a fault, at the moment, the fault cause needs to be analyzed and judged, all fault diagnoses of the oil level sensor are based on the original voltage signal of the oil level sensor read by the engine controller, and only when the voltage signal of the oil level sensor is normal, other fault diagnoses of the oil level sensor can be normally performed, so that whether the voltage signal is normal is firstly diagnosed, and therefore, the voltage signal of the oil level sensor is firstly obtained to judge whether the voltage signal of the oil level sensor is normal.
S102, judging whether the voltage of the oil level sensor is within a preset voltage range, and if so, executing S103.
In this embodiment of the present application, if the voltage of the oil level sensor is within the preset voltage range, the voltage of the oil level sensor may be considered normal at this time, so that the subsequent specific fault diagnosis may be continued.
The preset voltage range is defined by the low voltage threshold and the high voltage threshold, that is, when the voltage is greater than or equal to the low voltage threshold and less than or equal to the high voltage threshold, the operation voltage of the fuel level sensor at this time is considered to be normal, and S103 may be executed at this time. In general, the low voltage threshold and the high voltage threshold of the fuel level sensor are set in unison by the manufacturer at the time of production.
If the working voltage of the oil level sensor is monitored to be smaller than the low voltage threshold value, the oil level sensor is not normally operated at the moment, a fault is detected, the fault is diagnosed as the low voltage fault of the oil level sensor, and the operator can conveniently make corresponding adjustment according to the diagnosis.
If the working voltage of the oil level sensor is monitored to be larger than the high voltage threshold value, the oil level sensor is not normally operated at the moment, a fault is detected, the fault is diagnosed as the high voltage fault of the oil level sensor, and the operator can conveniently make corresponding adjustment according to the diagnosis.
S103, obtaining a second difference value between the highest value of the oil level signal and the lowest value of the oil level signal in the first preset time.
In the embodiment of the application, when the voltage of the oil level sensor is within the preset voltage range, further specific diagnosis can be performed on the oil level sensor.
In one possible embodiment, if the oil level sensor has an unreasonably large change in a short time, it is indicated that the oil level sensor may have an oil level sensor signal interference fault, so, in order to be able to diagnose whether such a fault has occurred in the oil level sensor, a second difference value between the highest value of the oil level signal and the lowest value of the oil level signal in the first preset time is obtained, if the highest value of the oil level signal and the lowest value of the oil level signal in the first preset time differ greatly, it is indicated that the signal of the oil level sensor is subjected to such interference, and therefore, it is necessary to obtain a second difference value between the highest value of the oil level signal and the lowest value of the oil level signal in the first preset time of the oil level sensor to determine whether the second difference value is large.
It should be noted that, the first preset time may be set by the user according to the actual situation, which is not limited herein specifically, for example, in a shorter time, such as ten minutes, the highest value of the oil level signal and the lowest value of the oil level signal monitored by the oil level sensor in ten minutes are obtained, and the second difference between the two values is calculated, so as to determine whether the difference between the two values is larger.
In addition, before the second difference is obtained, the vehicle may run under extreme conditions (such as high-loop, inclined and bumpy road), under such road conditions, the liquid level of the fuel may fluctuate severely, which causes a certain interference to the signal of the fuel level sensor, and may cause the maximum value of the fuel level signal monitored by the fuel level sensor to differ greatly from the minimum value of the fuel level signal in a short time.
If the speed of the vehicle is zero, the vehicle certainly does not run under the extreme working condition, the signal interference diagnosis of the subsequent oil level sensor is not affected by the extreme working condition, and then a second difference value can be obtained to perform the signal interference fault diagnosis of the oil level sensor.
If the vehicle speed is not zero, then it is determined whether the vehicle speed is within a first preset range, whether the steering wheel angle of the vehicle is within a second preset range and whether the load of the vehicle is within a third preset range, only when the vehicle speed is within the first preset range, the steering wheel angle of the vehicle is within the second preset range, and the load of the vehicle is within the third preset range, it is considered that the vehicle is not running under extreme conditions (high-loop, inclined and bumpy road), the signal interference fault diagnosis of the vehicle is not affected by the extreme conditions, and if the oil level signal is in an unreasonably large jump within a short time, that is, the second difference is large, the fault is considered as the fault of the oil level sensor itself, but not as the influence of the external environment.
It should be noted that the first preset range, the second preset range, and the third preset range may be set by the user according to the actual situation, which is not limited herein.
And S104, if the second difference value is larger than a second preset value, determining that the oil level sensor has signal interference faults.
In this embodiment of the present application, after step S103 is performed, a second difference between the highest value of the oil level signal and the lowest value of the oil level signal in the first preset time may be obtained, at this time, whether the second difference is larger or not is determined, if so, it is indicated that the oil level signal has unreasonable jump in the first preset time, and the oil level sensor has an oil level sensor signal interference fault, so that an index of the second preset value is introduced to determine whether the second difference is larger or not, and if the second difference is greater than the second preset value, it is determined that the oil level sensor signal interference fault has occurred.
It should be noted that, the second preset value may be set by the user according to the actual situation, which is not limited herein.
In the actual oil level sensor fault diagnosis process, the oil level sensor fault diagnosis method may further include:
and when the voltage of the oil level sensor is in a preset voltage range, if the second difference value is smaller than a third preset value, the third preset value is smaller than the second preset value, and the accumulated fuel consumption is larger than a fourth preset value, determining that the oil level sensor has signal jamming faults.
In this embodiment of the present application, when the voltage of the oil level sensor is normal, that is, when the line of the oil level sensor is diagnosed normally, it may be further determined whether the second difference is too small, if the second difference is too small, that is, the variation of the oil level signal is too small in the first preset time, and the accumulated fuel consumption is relatively large, then it indicates that the signal of the oil level sensor may have a clamping stagnation, and the variation of the oil level signal cannot be updated in time, so that at this time, the oil level sensor has a clamping stagnation fault of the oil level sensor signal.
Therefore, in order to judge whether the second difference is smaller, a third preset value is introduced, when the second difference is smaller than the third preset value and the accumulated fuel consumption is larger than a fourth preset value, the fourth preset value is larger than the third preset value, which indicates that the actual fuel consumption is quite large, but the second difference is smaller than the third preset value, namely, the oil level sensor monitors that the change of the oil level signal is smaller, the change of the oil level signal does not keep up with the actual fuel consumption, which indicates that the oil level sensor signal has a clamping stagnation fault, so that the change of the oil level signal is smaller.
It should be noted that the third preset value and the fourth preset value may be set by the user according to the actual situation, which is not particularly limited herein.
In the above embodiment, the accumulated fuel consumption amount is calculated as follows: the accumulation is started after the engine is operated, and if any one of fault clearing by using a general diagnostic instrument, resetting by an Electronic Control Unit (ECU) of the engine and fault diagnosis completion of the signal clamping stagnation of the oil level sensor occurs, the accumulated fuel consumption is cleared, and the accumulation is restarted.
By using the method provided by the embodiment of the application, when the absolute value of the first difference value between the oil level signal variation and the accumulated fuel consumption is larger than a first preset value, the voltage of the oil level sensor can be obtained; judging whether the voltage of the oil level sensor is within a preset voltage range; if so, acquiring a second difference value between the highest value of the oil level signal and the lowest value of the oil level signal in the first preset time; and if the second difference value is larger than a second preset value, determining that the oil level sensor has signal interference faults. Therefore, by the method provided by the embodiment of the application, the diagnosis accuracy under the condition that the fuel liquid level severely fluctuates due to the extreme working condition can be improved, false alarm of fault codes is avoided, a user is helped to accurately identify faults, and the working efficiency is improved.
Exemplary apparatus
Referring to fig. 2, a schematic diagram of a fault diagnosis device for an oil level sensor according to an embodiment of the present invention is provided. The oil level sensor malfunction diagnosis device may include:
an oil level sensor voltage acquisition unit 301 for acquiring an oil level sensor voltage when an absolute value of a first difference between the oil level signal variation and the accumulated fuel consumption is greater than a first preset value;
a judging unit 302, configured to judge whether the oil level sensor voltage is within a preset voltage range;
a second difference value obtaining unit 303, configured to obtain a second difference value between a highest value of the oil level signal and a lowest value of the oil level signal in a first preset time when the voltage of the oil level sensor is within a preset voltage range;
and a signal interference fault determining unit 304, configured to determine that the oil level sensor has a signal interference fault when the second difference is greater than a second preset value.
Optionally, the preset voltage range is defined by a low voltage threshold and a high voltage threshold, the device further comprising:
a low voltage fault determining unit configured to determine that the oil level sensor has a low voltage fault when the oil level sensor voltage is less than the low voltage threshold;
and the high-voltage fault determining unit is used for determining that the oil level sensor has a high-voltage fault when the voltage of the oil level sensor is larger than the high-voltage threshold value.
Optionally, the apparatus further includes:
and the signal clamping stagnation fault determining unit is used for determining that the oil level sensor has the signal clamping stagnation fault if the second difference value is smaller than a third preset value when the voltage of the oil level sensor is in a preset voltage range, the third preset value is smaller than the second preset value, the accumulated fuel consumption is larger than a fourth preset value, and the fourth preset value is larger than the third preset value.
Optionally, before the second difference is obtained, the method further includes:
a vehicle state determining unit configured to determine that a vehicle speed is zero; or the vehicle speed is determined to be non-zero, the vehicle speed is in a first preset range, the steering wheel angle of the vehicle is in a second preset range, and the load of the vehicle is in a third preset range.
Optionally, the accumulated fuel consumption is calculated as follows: the accumulation is started after the engine is operated, and if any one of fault clearing by using a general diagnostic instrument, resetting by an Electronic Control Unit (ECU) of the engine and fault diagnosis completion of the signal clamping stagnation of the oil level sensor occurs, the accumulated fuel consumption is cleared, and the accumulation is restarted.
The arrangement of each unit or module of the apparatus of the present application may be implemented by referring to the method shown in fig. 1, which is not described herein again.
By using the device provided by the embodiment of the application, when the absolute value of the first difference value between the oil level signal variation and the accumulated fuel consumption is larger than the first preset value, the voltage of the oil level sensor can be obtained; judging whether the voltage of the oil level sensor is within a preset voltage range; if so, acquiring a second difference value between the highest value of the oil level signal and the lowest value of the oil level signal in the first preset time; and if the second difference value is larger than a second preset value, determining that the oil level sensor has signal interference faults. Therefore, by the method provided by the embodiment of the application, the diagnosis accuracy under the condition that the fuel liquid level severely fluctuates due to the extreme working condition can be improved, false alarm of fault codes is avoided, a user is helped to accurately identify faults, and the working efficiency is improved.
It should be noted that, in the present specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment is mainly described in a different point from other embodiments. In particular, for the apparatus and system embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, with reference to the description of the method embodiments in part. The apparatus and system embodiments described above are merely illustrative, in which elements illustrated as separate elements may or may not be physically separate, and elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
The foregoing is merely one specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (6)
1. A method of diagnosing a fault in an oil level sensor, the method comprising:
acquiring the voltage of the oil level sensor when the absolute value of the first difference value between the oil level signal variation and the accumulated fuel consumption is larger than a first preset value;
judging whether the voltage of the oil level sensor is within a preset voltage range;
if so, acquiring a second difference value between the highest value of the oil level signal and the lowest value of the oil level signal in the first preset time;
if the second difference value is larger than a second preset value, determining that the oil level sensor has signal interference faults;
when the voltage of the oil level sensor is within a preset voltage range, if the second difference value is smaller than a third preset value, the third preset value is smaller than the second preset value, the accumulated fuel consumption is larger than a fourth preset value, and the fourth preset value is larger than the third preset value, determining that the oil level sensor has a signal clamping stagnation fault;
before obtaining the second difference value, further comprising: determining that the vehicle speed is zero; or determining that the vehicle speed is not zero, the vehicle speed is in a first preset range, the steering angle of the vehicle steering wheel is in a second preset range, and the load of the vehicle is in a third preset range.
2. The method of claim 1, wherein the preset voltage range is defined by a low voltage threshold and a high voltage threshold, the method further comprising:
if the oil level sensor voltage is smaller than the low voltage threshold value, determining that the oil level sensor has a low voltage fault;
and if the oil level sensor voltage is greater than the high voltage threshold, determining that the oil level sensor has a high voltage fault.
3. The method of claim 1, wherein the accumulated fuel consumption is calculated as follows: accumulation is started from the time of engine operation; if any one of fault clearing by using a universal diagnostic instrument, resetting by using an electronic control unit of the engine and completion of fault diagnosis of the signal clamping stagnation of the oil level sensor occurs, the accumulated fuel consumption is cleared, and accumulation is restarted.
4. An oil level sensor failure diagnosis apparatus, characterized by comprising:
a vehicle state determining unit configured to determine that a vehicle speed is zero; or the vehicle speed is determined to be non-zero, the vehicle speed is in a first preset range, the steering angle of the vehicle steering wheel is in a second preset range, and the load of the vehicle is in a third preset range;
an oil level sensor voltage acquisition unit for acquiring an oil level sensor voltage when an absolute value of a first difference between the oil level signal variation and the accumulated fuel consumption is greater than a first preset value;
a judging unit for judging whether the oil level sensor voltage is within a preset voltage range;
a second difference value obtaining unit, configured to obtain a second difference value between a highest value of the oil level signal and a lowest value of the oil level signal in a first preset time when the voltage of the oil level sensor is within a preset voltage range;
a signal interference fault determining unit, configured to determine that the oil level sensor has a signal interference fault when the second difference is greater than a second preset value;
and the signal clamping stagnation fault determining unit is used for determining that the oil level sensor has the signal clamping stagnation fault if the second difference value is smaller than a third preset value when the voltage of the oil level sensor is in a preset voltage range, the third preset value is smaller than the second preset value, the accumulated fuel consumption is larger than a fourth preset value, and the fourth preset value is larger than the third preset value.
5. The apparatus of claim 4, wherein the preset voltage range is defined by a low voltage threshold and a high voltage threshold, the apparatus further comprising:
a low voltage fault determining unit configured to determine that the oil level sensor has a low voltage fault when the oil level sensor voltage is less than the low voltage threshold;
and the high-voltage fault determining unit is used for determining that the oil level sensor has a high-voltage fault when the voltage of the oil level sensor is larger than the high-voltage threshold value.
6. The apparatus of claim 4, wherein the accumulated fuel consumption is calculated as follows: accumulation is started from the time of engine operation; if any one of fault clearing by using a universal diagnostic instrument, resetting by using an electronic control unit of the engine and completion of fault diagnosis of the signal clamping stagnation of the oil level sensor occurs, the accumulated fuel consumption is cleared, and accumulation is restarted.
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| CN202011195172.0A CN114435266B (en) | 2020-10-30 | 2020-10-30 | Fault diagnosis method and device for oil level sensor |
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| CN202011195172.0A CN114435266B (en) | 2020-10-30 | 2020-10-30 | Fault diagnosis method and device for oil level sensor |
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Citations (5)
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| CN1462833A (en) * | 2002-05-29 | 2003-12-24 | 现代自动车株式会社 | Fault detection method of vehicle fuel level sensor |
| KR20040015576A (en) * | 2002-08-13 | 2004-02-19 | 현대자동차주식회사 | Apparatus for detecting fail of fuel level sensor in automobile and method of the same |
| KR20040037397A (en) * | 2002-10-28 | 2004-05-07 | 현대자동차주식회사 | method for deciding breakdown of fuel tank level sensor |
| CN103134697A (en) * | 2013-03-11 | 2013-06-05 | 中联重科股份有限公司 | Fault diagnosis method and system for concrete pump truck shock mitigation system and concrete pump truck |
| JP2019173606A (en) * | 2018-03-27 | 2019-10-10 | 株式会社Ｓｕｂａｒｕ | Oil level determination device |
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| US9822723B2 (en) * | 2015-03-04 | 2017-11-21 | Denso Corporation | Fuel level sensor diagnosis device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1462833A (en) * | 2002-05-29 | 2003-12-24 | 现代自动车株式会社 | Fault detection method of vehicle fuel level sensor |
| KR20040015576A (en) * | 2002-08-13 | 2004-02-19 | 현대자동차주식회사 | Apparatus for detecting fail of fuel level sensor in automobile and method of the same |
| KR20040037397A (en) * | 2002-10-28 | 2004-05-07 | 현대자동차주식회사 | method for deciding breakdown of fuel tank level sensor |
| CN103134697A (en) * | 2013-03-11 | 2013-06-05 | 中联重科股份有限公司 | Fault diagnosis method and system for concrete pump truck shock mitigation system and concrete pump truck |
| JP2019173606A (en) * | 2018-03-27 | 2019-10-10 | 株式会社Ｓｕｂａｒｕ | Oil level determination device |
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