Patent ID: 6431307
Filing Date: 2002-08-13
Classification: B62D

Abstract:
A control system for an electric power steering system adapted to generate a steering assist force by an electric motor driven on the basis of a steering torque applied to an operation member, the control system comprising:a target current determining circuit for generating a target current value according to the steering torque; a compensation value determining circuit for generating a compensation current value according to a time-based differential value of the steering torque; a waveform transforming circuit for performing a waveform transformation to convert the compensation current value generated by the compensation value determining circuit into a modified compensation value which sinusoidally changes with time; a circuit for generating a control command value by superimposing the modified compensation value generated by the waveform transforming circuit on the target current value determined by the target current determining circuit; and a motor driving circuit for driving the electric motor on the basis of the control command value.