Patent ID: 6789641
Filing Date: 2004-09-14
Classification: B62D

Abstract:
A method for controlling an electric assist motor for providing steering assist in response to a sensed torque signal, said method comprising the steps of:filtering the sensed torque signal to provide a low frequency torque signal and a high frequency torque signal; determining a low frequency assist torque signal as a function of said low frequency torque signal; determining a high frequency assist gain signal as a function of said sensed torque signal and a sensed vehicle speed; applying said high frequency assist gain signal to said high frequency torque signal to determine a high frequency assist torque signal; determining a torque command signal as a function of said low frequency assist torque signal and said high frequency assist torque signal; and commanding the electric assist motor to provide steering assist in accordance with a voltage output signal, said voltage output signal being functionally related to said torque command signal.