NOVELTY - The system has error calculation module (130) that calculates current error (134) based on commanded electrical current (132) and electrical current (128) applied to torque-assist motor (102). A controller module (136) calculates quadrature axis voltage (138) based on current error and gain factors (118,122). An inverter (140), driven by direct voltage signal (142) phased with rotational position of torque-assist motor, produces electrical current applied to torque-assist motor. The characteristic of electrical current applied to torque-assist motor is affected by quadrature axis voltage.    USE - Control system for operation of torque-assist motor of electrical power-assist system of motor vehicle.    ADVANTAGE - Increases frequency response while improving attenuation of handwheel vibration at relatively low speeds since the inverter, driven by direct voltage signal that is phased with rotational position of torque-assist motor, produces electrical current applied to torque-assist motor. Prevents unnecessary amplification of noise inherent in signals used by feedback control system and provides acceptably responsive and stable control over the operation of the torque-assist motor since the inverter, driven by direct voltage signal that is phased with rotational position of torque-assist motor, produces electrical current applied to torque-assist motor.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for controlling operation of torque-assist motor of electrical power-assist system of motor vehicle.    DESCRIPTION OF DRAWING(S) - The drawing shows a functional block diagram of the control system for operation of torque-assist motor of electrical power-assist system of motor vehicle.    Torque-assist motor (102)    Gain factors (118,122)    Electrical current (128)    Error calculation module (130)    Commanded electrical current (132)    Current error (134)    Controller module (136)    Quadrature axis voltage (138)    Inverter (140)    Direct voltage signal (142)