Pulse-type vehicle speed sensor signal diagnosis method

Abstract

The invention provides a pulse-type vehicle speed sensor signal diagnosis method. The pulse-type vehicle speed sensor signal diagnosis method comprises the following steps of judging whether an electrical fault is reported by a vehicle speed sensor or not according to a voltage acquisition condition of a detection circuit; if yes, displaying a fault and a fault type of the vehicle speed sensor; ifnot, continuing to diagnose; detecting whether an ABS wheel speed signal is received or not, if not, displaying an ABS signal lost fault; if yes, executing next judgment; judging whether data of theABS wheel speed signal is effective or not, if not, displaying an ABS signal failure fault, if yes, executing next operation; judging whether the vehicle speed signal is effective or not, and not judging if a parking signal is generated; and judging effectiveness of the vehicle speed signal if no parking signal is generated and a vehicle starts, and judging whether the vehicle speed signal is effective or not comparing errors of a vehicle speed and a wheel speed. By the pulse-type vehicle speed sensor signal diagnosis method, the electrical fault diagnosis of the sensor is achieved.

Description

technical field [0001] The invention relates to the technical field of vehicle speed detection, in particular to a signal diagnosis method of a pulse type vehicle speed sensor. Background technique [0002] In the prior art, when there is an electrical fault in the vehicle speed sensor, an electrical fault diagnosis method is used for fault diagnosis; for other faults other than electrical faults, the wheel speed sensor that drives the wheels is mainly used to sense the wheel speed as a vehicle speed sensor diagnosis method. By judging the validity of the wheel speed and checking whether the average wheel speed is greater than the speed of the vehicle speed sensor in the low-accuracy area, respectively shielding the invalid wheel speed and the low-accuracy area of ​​the vehicle speed sensor to reduce the risk of misdiagnosis of vehicle speed; The accuracy of the average wheel speed signal of the driving wheels is checked, and the fault judgment threshold is reasonably matche...

AI Technical Summary

Problems solved by technology

The drawbacks of the prior art are incomplete diagnosis of electrical faults in the vehicle speed sensor; incomplete consideration of signals affecting the validity of the sensor signal

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