Patent ID: 7188701
Filing Date: 2007-03-13
Classification: B62D

Abstract:
1. An electric power steering control system incorporating motor velocity compensation, said system comprising: an electric motor disposed in a vehicle for applying torque to a steerable wheel; a torque sensor disposed in said vehicle for detecting a steering wheel torque and generating a torque signal; a motor velocity sensor generating a speed signal indicative of a speed of said electric motor; and a controller operably coupled to said torque sensor, said motor velocity sensor, and said electric motor, said controller having a first filter structure and a second filter, said first filter structure filtering said torque signal from said torque sensor to obtain a filtered torque command, said second filter filtering said speed signal from said motor velocity sensor to obtain an output signal, said second filter utilizing a gain value that varies as a function of said filtered torque command, said controller configured to generate a compensated torque command based on said filtered torque signal and said output signal for controlling output torque of said electric motor.