A kind of wheel speed sensor fault detection method

Abstract

The invention belongs to the field of vehicle sensor fault detection, and in particular relates to a wheel speed sensor fault detection method. The method constructs a vehicle coordinate system, constructs a state space model of four wheels including a wheel state equation and a wheel observation equation, and calculates the maximum state of the system. Optimum estimated value, normalize the optimal estimated value of each wheel state, calculate the average value of the normalized processing results of the four wheels, and compare the normalized processing result value of the optimal estimated value of each wheel state with the four The average value of the wheel normalization processing results is used as a difference, and compared with the set effective threshold of the difference, it is judged whether the wheel speed sensor is abnormal, so as to provide accurate data information for the corresponding fault-tolerant control. The invention has high accuracy for judging the wheel speed sensor that has failed, and has the characteristics of simplicity and high efficiency.

Description

technical field [0001] The invention belongs to the field of vehicle sensor failure detection, in particular to a wheel speed sensor failure detection method. Background technique [0002] With the advancement of vehicle active safety technology and high-precision manufacturing, in-vehicle sensors are developing towards miniaturization, diversification and redundancy, such as commonly used in-vehicle sensors - accelerometers, gyroscopes, wheel speed sensors, etc. Reliability issues also follow. The wheel speed sensor of the vehicle is an important part of the vehicle. On the one hand, due to the limited life of the wheel speed sensor, failure is inevitable, especially when the car is in an extreme environment, the possibility of failure will increase; on the other hand , If the corresponding measures cannot be taken in time for the faulty wheel speed sensor, it may cause the ABS and ESP to start incorrectly and operate incorrectly. The current fault detection is mainly bas...

AI Technical Summary

Problems solved by technology

Too high a threshold may make it impossible to detect real faults; too low a threshold may produce false positives

In addition, the fault detection method used in the prior art for the vehicle speed sensor is mainly to detect the fault of the wheel speed sensor according to the engine speed, engine torque and shift type, but this method also has misjudgment phenomenon, and is sensitive to working conditions Therefore, it is urgent to improve the accuracy of wheel speed sensor fault detection and the adaptability to driving conditions

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