Patent ID: 8849498

Claim:
A system for detecting a fail in an electric power steering apparatus, the system comprising: a steering angle sensor generating and transmitting a steering angle signal that measures a rotation angle of a steering wheel; a motor generating an assistant power for smooth steering and transmitting a current and a voltage based on operation of the motor; and an Electronic Control Unit (ECU) configured for: receiving the current and the voltage from the motor; determining a rotation direction of the motor based on the received current and voltage from the motor; receiving the steering angle signal from the steering angle sensor; determining a first rotation direction of the steering wheel from the received steering angle signal from the steering angle sensor; and then, determining that the steering angle signal has a fail based on the rotation direction of the motor determined from the received current and voltage from the motor, when the rotation direction of the motor is not equal to the first rotation direction of the steering wheel, and starting operation of a fail-safe logic.