ELECTRIC POWER STEERING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an electric power steering device capable of enhancing the stability in the control of a motor for generating the steering assist force, enhancing the responsiveness to the steering, and reducing the effect of the disturbance on the steering. SOLUTION: The steering torque of a steering wheel 2 is detected by a torque sensor 22, and a motor 10 to generate the steering assist force is controlled so that the steering assist force to meet the basic assist torque corresponding to the detected steering torque is generated. The relationship between the steering torque and the basic assist torque is set so that the assist gradient which is the rate of change of the basic assist torque to the steering torque is changed according to the change of the steering torque. The correction of the output of the motor 10 is changed according to the change of the assist gradient. COPYRIGHT: (C)2006,JPO&NCIPI