Patent ID: 6691818
Filing Date: 2004-02-17
Classification: B62D

Abstract:
A control unit for an electric power steering apparatus that controls a motor for giving steering assist force to a steering mechanism based on a current control value calculated from a steering assist command value calculated by a calculator based on a steering torque generated in a steering shaft, and a current value of the motor,the control unit comprising a center responsiveness improving section configured to carry out a phase compensation and differentiation on a torque signal indicative of the steering torque, wherein said control unit adds said torque signal which has been differentiated and phase compensated to the steering assist command value, said center responsiveness improving section comprises a phase compensation section configured to carry out said phase compensation, a differentiating section configured to carry out said differentiation, and a gain setting section configured to set a gain of said torque signal, wherein said phase compensation section carries out phase advancement compensation, and said differentiating section carries out said differentiation on said torque signal which has been phase advancement compensated by said phase compensation section, and wherein said differentiating section carries out approximate differentiation.