CONTROL DEVICE FOR ELECTRIC POWER STEERING SYSTEM

摘要

PROBLEM TO BE SOLVED: To dissolve unbalance when turning and returning a steering wheel by setting the correction quantity when returning the steering wheel, to different values according to the turning and returning directions of the steering wheel. SOLUTION: An electric power steering is provided with an electric motor interposed in a steering torque transmission mechanism from a steering wheel to wheels to generate torque for assisting steering torque by a driver. The electric power steering is provided with a steering wheel return correcting part for correcting the friction of a rotor of the electric motor and the friction of a vehicle and a steering system, and a steering state discriminative compensating part for discriminating the turning and returning of the steering wheel. The correction quantity of the steering wheel return correcting part is set to different values according to the turning and returning directions of the steering wheel.