Patent ID: 7549504
Filing Date: 2009-06-23
Classification: B62D,H02P

Abstract:
1. An electric power steering system including: a steering wheel, an electric assist motor operatively coupled to the steering wheel, and an electronic controller operatively coupled to the assist motor for receiving a first signal representative of torque applied to the steering wheel, and a second signal representative of angular velocity of the assist motor; the electronic controller producing an active damping motor command signal as a function of the first and second signals; wherein the active damping motor command signal is scaled by a first scaling factor if the first and second signals are both positive, or if the first and second signals are both negative, to provide a scaled motor command signal; wherein the active damping motor command signal is scaled by a second scaling factor if the first signal is positive and the second signal is negative, or if the first signal is negative and the second signal is positive, to provide the scaled motor command signal.