Patent ID: 8820469
Filing Date: 2014-09-02
Classification: B62D

Abstract:
1. An electric power steering apparatus which controls a motor based on a current command value calculated from a steering assist command value that is calculated based on a steering torque generated in a steering shaft of a vehicle and a motor current of said motor that provides a steering mechanism having a rack shaft with a steering assist force, comprising: a reaction force detecting means for estimating or measuring a reaction force inputted into said rack shaft; a disturbance band extracting means comprising a filter section and a gain section that are connected in series, and for extracting a resonance frequency band to suspension of said vehicle as disturbances to be removed from said reaction force; and a deceleration calculating means for calculating a deceleration of said vehicle based on a velocity signal; and wherein said steering assist command value or said current command value is corrected with a reaction signal extracted by said disturbance band extracting means, and as said deceleration becomes high, a filter-pass characteristic of said filter section and a gain of said gain section are increased.