Patent ID: 9327762
Filing Date: 2016-05-03
CPC Classification: B62D

Claim Text:
1. A method of controlling a motor drive torque in an electric power steering system having a motor and a steering assembly, the method comprising the steps of: measuring, with a torque sensor, internal vibrations within the steering assembly representing smooth road shake (SRS) to generate a torque signal; processing the torque signal in accordance with a steering perception program to produce a motor control signal suitable to control the motor; evaluating the smooth road shake (SRS) of the torque signal and generating a dithering signal based on the smooth road shake (SRS) of the torque signal; superimposing the dithering signal onto the motor control signal to linearize the motor control signal with the dithering signal and produce a dithered motor control signal; and controlling the motor drive torque of the motor on the steering assembly based on the dithered motor control signal.