Patent ID: 8326493
Filing Date: 2012-12-04
Classification: B62D

Abstract:
1. A motor-driven power steering control apparatus for use with a car, including a torque sensor detecting steering torque applied by a driver, a torque controller calculating an assist torque current assisting the steering torque based on a steering torque signal detected by the torque sensor, and a motor generating assist torque with the assist torque current, comprising: dynamic state quantity detection means detecting dynamic state quantity of the motor-driven power steering control apparatus; a small-amplitude pass filter filtering out a vibration component having a small amplitude compared with a steering component from a detection output of the dynamic state quantity detection means and preventing amplitudes of the detection output which are larger than the small amplitude from passing, the small-amplitude pass filter including a hysteresis filter which performs hysteresis function processing having a hysteresis range corresponding to the vibration component, and a subtractor subtracting an output signal of the hysteresis filter from the output signal of the dynamic state quantity detection means; and vibration suppression control means reducing a vibration component signal obtained by the small-amplitude pass filter; wherein a feedback control loop, including a combiner between the assist torque current being output from the torque controller and a vibration suppression current being output from the vibration suppression control means, is established, to suppress a vibration component of the motor.