Patent ID: 8868296

Claim:
A steering angle sensor failure detection system comprising: a steering angle sensor configured to output a steering angle signal corresponding to a rotation angle of a steering wheel of a vehicle; a motor position sensor configured to sense the position of a rotator of a motor, and to output a position sensing signal; a wheel speed sensor configured to output a wheel speed signal regarding a wheel speed of the vehicle; and an electronic control unit configured to compare the value of the position sensing signal and a steering angle calculated based on the wheel speed signal when a difference between the value of the steering angle signal and the value of the position sensing signal is larger than a first reference value, to compare the value of the steering angle signal and the steering angle calculated based on the wheel speed signal when a difference between the value of the position sensing signal and the steering angle calculated based on the wheel speed signal is equal to or smaller than a second reference value, and to output a steering angle sensor failure signal when a difference between the value of the steering angle signal and the steering angle calculated based on the steering wheel signal is larger than a third reference value.