Patent ID: 8818636
Filing Date: 2014-08-26
Classification: B62D

Abstract:
1. An electric power steering apparatus, comprising: a first rotary shaft connected to a steering wheel; a rack shaft configured to effect turning of a wheel to be turned, by a rectilinear motion; a second rotary shaft configured to effect the rectilinear motion of the rack shaft; a torsion bar configured to provide a connection between the first rotary shaft and the second rotary shaft, and configured to be twisted by operation of the steering wheel; an electric motor configured to apply assist force for the operation of the steering wheel; a steering torque detector configured to detect steering torque of the steering wheel; and a target current setting unit configured to set a target current to be supplied to the electric motor, on the basis of the steering torque detected by the steering torque detector, a feedback controller configured to perform feedback control on the target current set by the target current setting unit, the target current setting unit comprising: wherein a transfer function H(s) of the resonance compensator is defined as: wherein: wherein: