Patent ID: 8050824
Filing Date: 2011-11-01
Classification: B62D

Abstract:
1. An electric power steering apparatus, comprising: a steering force assist device that provides an assist force for assisting a steering operation to a steering system by using a motor as a drive source, and a controller that controls an operation of the steering force assist device, wherein the controller computes a fundamental component of the assist force to be generated in the steering force assist device based on a steering torque; and superimposes on the fundamental component a steering reaction force component that is computed by executing a torque feedback control based on a difference between a target steering reaction force and the steering torque, which is an actual steering reaction force; and the controller executes a compensation control of the fundamental component of the assist force, wherein the controller executes the compensation control based on an assist gradient, which is a ratio of a variation of the fundamental component to a variation of the steering torque, when the torque feedback control is not executed, and executes the compensation control based on a value obtained by adding a feedback gain gradient, which is a ratio of a variation of the steering reaction force component to a variation of the difference in the torque feedback control, to the assist gradient when the torque feedback control is executed.