Fault diagnosis method and device for oil level sensor

Abstract

The embodiment of the invention discloses an oil level sensor fault diagnosis method and device, and the method comprises the steps: obtaining the voltage of an oil level sensor when the absolute value of a first difference value between the variation of an oil level signal and the accumulated fuel consumption is greater than a first preset value; judging whether the voltage of the oil level sensor is within a preset voltage range or not; if yes, a second difference value between the oil level signal maximum value and the oil level signal minimum value within the first preset time is obtained; and if the second difference value is greater than a second preset value, determining that the signal interference fault of the oil level sensor occurs. Therefore, through the method provided by the embodiment of the invention, the signal interference fault of the oil level sensor can be accurately diagnosed, the fault of unreasonable signal misdiagnosis is avoided, the diagnosis accuracy is improved, a user is helped to accurately identify the fault, and the working efficiency is improved.

Description

technical field [0001] The present application relates to the field of vehicle control, in particular to a fuel level sensor fault diagnosis method and device. Background technique [0002] At present, the existing technology generally diagnoses the fault of the fuel level sensor by calculating the difference between the accumulated fuel consumption and the change of the oil level signal. The signal is unreasonable fault. [0003] Due to the influence of the layout of the vehicle's fuel tank, the fuel level will fluctuate violently under extreme working conditions (such as high-speed rings, slopes, and bumpy roads), which will lead to misdiagnosis of unreasonable fault signals. Contents of the invention [0004] In order to solve the above technical problems, this application provides a method and device for oil level sensor fault diagnosis, which can accurately diagnose the signal interference fault of the oil level sensor, avoid misdiagnosis of unreasonable signal fault...

AI Technical Summary

Problems solved by technology

[0002] At present, the existing technology generally diagnoses the fault of the fuel level sensor by calculating the difference between the accumulated fuel consumption and the change of the oil level signal. Unreasonable failure of the signal

[0003] Due to the influence of the layout of the vehicle's fuel tank, the fuel level will fluctuate violently under extreme working conditions (such as high rings, slopes, and bumpy roads), which will lead to misdiagnosis of unreasonable signal failures

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