Automobile wheel speed sensor fault monitoring method

Abstract

The invention discloses a method for testing fault of an automobile wheel speed sensor, which mainly analyzes all afferent rotating speed and calculates the largest wheel speed; when the largest wheel speed is greater than a certain threshold, whether the wheel speed of each wheel is normal is judged, the state of the wheel speed of each wheel is recorded with a state word; if the wheel speed output by the sensor is not normal and the state of each wheel recorded before and after is coherent, the duration of the state is recorded; when the duration of the fault state exceeds the threshold, the fault is confirmed. The method can monitor the working condition of the sensor when the vehicle runs and records the state of the fault sensor for each control system to make the right judgment, thus implementing the correct pressure regulator control and guarantying the traffic safety.

Description

technical field [0001] The invention relates to an automobile active safety monitoring technology, in particular to a fault monitoring method for an automobile wheel speed sensor. Background technique [0002] In the anti-lock braking system (ABS) or anti-skid system (ASR) widely used in modern automobiles, the wheel speed sensor is installed on the wheel to sense the wheel speed. The incoming wheel speed signal calculates the wheel speed and acceleration, analyzes the wheel state, adjusts the pressure of the brake cylinder through the pressure regulator, and prevents the wheel from locking when braking or excessive slippage when driving. Therefore, whether the wheel speed signal is normal or not directly affects the judgment of the controller on the wheel state. If the wheel speed signal is abnormal, it may cause the controller to perform incorrect control and affect driving safety. When the following conditions occur, the output signal of the sensor is zero, such as a ci...

AI Technical Summary

Problems solved by technology

If the wheel speed signal is abnormal, it may cause the controller to perform incorrect control and affect driving safety

When the following conditions occur, the output signal of the sensor is zero, such as a circuit break in the sensor or between the sensor and the controller; the sensor is short-circuited; the circuit is normal, but because the gap between the sensor and the induction ring gear is too large, it cannot be in the sensor. Generate induced voltage; other reasons that cause the controller to fail to detect the output signal of the sensor

When the wheel speed sensor on some wheels has normal signal output, and some wheels have no wheel speed signal, when the car performs normal braking, the controller may think that the wheel without wheel speed signal has been locked, and the Improper decompression of the wheel brake cylinders, resulting in excessively long braking distances and even traffic accidents

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