Abstract: An electrically operated power steering device which is fitted to the steering system of a vehicle to provide supplementary steering power by means of an electric motor, wherein the electrically operated power steering device controls the motor current by the signal corresponding to the torsional torque in the steering system and the single corresponding to the restoring torque in accordance with the angular displacement of the wheel, so that the restoring force takes effect immediately to restore the steering wheel when the input torque on the steering wheel is reduced.

Abstract: A system having a motor operatively connected to a steering system for reducing the steering effort is provided with a torsion torque sensor for detecting torsion torque in the steering system during a steering operation, and a steering angle sensor provided for detecting steering angle. In response to the output signal of the torsion torque sensor, an assist signal is produced, and in response to the output of the steering angle sensor, a return signal is produced and a reducing signal dependent on the speed of steering of a steering wheel is produced. The reducing signal is added to the assist signal thereby reducing the assist signal, so that the output torque of the motor is decreased. When the steering wheel is stopped in a steered position the output torque of the motor is produced in the return direction of the steering wheel.