Patent ID: 6412591
Filing Date: 2002-07-02
Classification: B62D,F16H,Y10T

Abstract:
An electric power steering apparatus, comprising:arithmetic means for calculating a steering assist instruction value based on a steering torque generated at a rotation shaft of the steering wheel and a current control value from a current value of the motor; control means for controlling the motor on the basis of the steering assist instruction value and the current control value; and auxiliary arithmetic means for obtaining a differential value of a signal of the steering torque and adding the value to the steering assist instruction value, and further having a rack and pinion movement converting mechanism for converting rotation movement of a steering wheel into linear movement by engagement between a pinion shaft and a rack shaft; and a motor for assisting a driver's steering force to the steering wheel, and wherein: said rack and pinion movement converting mechanism is a rolling type rack and pinion movement converting mechanism; and an elastic body is disposed in a mechanism passage from said pinion shaft to an output shaft of said motor.