Patent ID: 7575092

Claim:
A vehicle steering control device comprising: an angle superimposing unit for variably controlling road wheel angle with respect to steering angle of a steering wheel operated by a driver by superpositioning an angle controlled by an electric actuator on the steering angle of the steering wheel; a steering torque estimation unit for estimating steering torque of the steering wheel, based on driving current of the electric actuator; a torque sensor for detecting the steering torque of the steering wheel operated by the driver; an electric power assist unit that is controlled, based on the steering torque detected by the torque sensor, for assisting the steering torque of the driver; and a comparison unit for comparing the steering torque detected by the torque sensor with the steering torque estimated by the steering torque estimation unit, wherein the vehicle steering control device determines whether the torque sensor is normal or abnormal based on the comparison by the comparison unit and, when the torque sensor is determined to be abnormal, controls the electric power assist unit based on the steering torque estimated by the steering torque estimation unit in place of controlling based on the steering torque detected by the torque sensor.