Patent ID: 8073592

Claim:
A steering system for a vehicle, comprising: an electric power steering device which comprises a steering unit of front wheels having an electric motor configured to generate an auxiliary torque in accordance with at least a steering torque, and is configured to transmit the auxiliary torque to the steering unit; a toe angle changer for a left rear wheel and a toe angle changer for a right rear wheel, which are capable of changing toe angles of the respective left and right rear wheels in accordance with at least a turning angle of the front wheels and a vehicle speed; and a steering controller configured to control the electric power steering device and the toe angle changer, wherein the steering system further comprises at least one of a toe angle changer anomaly detection unit configured to detect an abnormal state of the toe angle changer, and an electric power steering device anomaly detection unit configured to detect an abnormal state of the electric power steering device, and when an abnormal state of the toe angle changer is detected, the toe angle changer anomaly detection unit controls at least one of a target value of the auxiliary torque for assisting the electric power steering device and a viscosity in the electric power steering device, and when an abnormal state of the electric power steering device is detected, the electric power steering device anomaly detection unit controls the toe angle changer in a manner that the toe angle changer for allowing the rear wheels to be toed out is not performed.