Offset correction system and method for vehicle sensor

Abstract

The invention discloses a vehicle sensor offset correction system and a method thereof. The system and method use the four wheel speed sensors, the yaw rate sensor and the head angle information displayed in the vehicle's camera to determine whether the vehicle is going straight, and use the steering angle offset obtained from the steering angle sensor to determine whether the vehicle is going straight. Compensation offset value. In addition, the yaw rate sensor and steering angle information are used to determine whether the vehicle is driving on a curve, and the corresponding head angle is estimated to compensate the head angle offset. In this way, the offset compensation of the vehicle sensor for LKAS (Lane Keeping Assist System) can be performed even when the wheels are twisted or when driving on a curve.

Description

technical field [0001] The invention relates to a Lane Keeping Assist System (Lane Keeping Assist System, LKAS), in particular to an offset compensation technology of a vehicle sensor used in the LKAS. Background technique [0002] LKAS is a preventive safety system that recognizes the lane through the vehicle's imaging device, and when the recognized lane predicts that the vehicle will leave the lane, it generates an auxiliary steering torque to assist the vehicle not to leave the lane. LKAS, its structure usually includes: an image sensor (Image Sensor) for identifying the front lane, a steering angle sensor (Steering Angle Sensor, SAS) for detecting the driver's steering state, a control for judging the driving state of the vehicle and controlling the auxiliary steering torque The steering actuator (System ECU) and the steering actuator (Steering Actuator) that generate assist steering torque. In addition, in order to utilize the measured value of the steering angle, a r...

AI Technical Summary

Problems solved by technology

[0004] However, this invention calculates the difference between the steering angle for straight travel determination and the offset angle when it is judged to be in the straight travel state in the straight travel determination unit, and when the calculated difference exceeds a critical value, it is confirmed that the initialization of the steering angle sensor is faulty. However, when the wheels of the vehicle are twisted, it will always be judged that the steering angle sensor is faulty.

That is, there is no mention of the situation that the calculated difference will exceed the critical value even though the vehicle is going straight due to the setting of the critical value

In addition, when a wheel speed sensor failure or a steering torque sensor failure occurs that is not a failure of the steering angle sensor, a problem that is confirmed as a failure of the steering angle sensor also occurs.

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