Abstract: Even in the case that the steered wheels are turned by an actual turning angle due to a disturbance from the road surface, and the steering shaft, which is mechanically connected to the steered wheels, attempts to rotate, a command current to an assist motor is set so that the actual turning angle becomes a corrected target turning angle. The force (torque) that attempts to cause rotation of the steering shaft due to the disturbance input from the road surface is instantaneously canceled by the assist motor.

Abstract: A rack axial force is estimated depending on a steering torque detected by a torque sensor and a motor actual current passed through an assist motor, a standard steering torque of the steering is calculated based on the estimated rack axial force, and the motor actual current is feedback-controlled by a FB control section in such a manner that the steering torque of the steering will be the standard steering torque.

Abstract: Even in the case that the steered wheels are turned by an actual turning angle due to a disturbance from the road surface, and the steering shaft, which is mechanically connected to the steered wheels, attempts to rotate, a command current to an assist motor is set so that the actual turning angle becomes a corrected target turning angle. The force (torque) that attempts to cause rotation of the steering shaft due to the disturbance input from the road surface is instantaneously canceled by the assist motor.

Abstract: A reaction control system controls a reactive force to be applied to an operating device operated by a driver of a vehicle. The system includes a device for measuring a steering speed of steering of the operating device; a device for measuring a steering torque applied to the operating device; and a reactive force correcting device for correcting the reactive force in a manner such that the corrected reactive force increases at least when the measured steering speed is zero, and that the higher the measured steering torque, the higher the corrected reactive force is. The reactive force correcting device may correct the reactive force in a manner such that the higher a speed of the vehicle, the higher the corrected reactive force is. A non-effectivity range of the steering torque in which the corrected reactive force is not influenced by the steering torque may be defined.

Abstract: A reaction control system controls a reactive force to be applied to an operating device operated by a driver of a vehicle. The system includes a device for measuring a steering speed of steering of the operating device; a device for measuring a steering torque applied to the operating device; and a reactive force correcting device for correcting the reactive force in a manner such that the corrected reactive force increases at least when the measured steering speed is zero, and that the higher the measured steering torque, the higher the corrected reactive force is. The reactive force correcting device may correct the reactive force in a manner such that the higher a speed of the vehicle, the higher the corrected reactive force is. A non-effectivity range of the steering torque in which the corrected reactive force is not influenced by the steering torque may be defined.