Electric power steering

Abstract

An electric power steering apparatus provides a steering power assist of a motor to the steering system of an associated automotive vehicle, so as to reduce necessary steering power to be applied by a driver. The steering apparatus includes an attenuation device in the form of a phase delay circuit or an active low-pass filter, which is provided in a feedback loop connecting a motor current detector and a control section of a control unit constituting the vehicle steering system. By the attenuation device attenuating relatively high frequency components of motor current detected by the motor current detector, there is achieved a high-performance electric power steering apparatus which is capable of reducing noise in the feedback loop, without affecting the motor current, to a sufficient degree to highly improve a response to a driver's steering operation.

Dependencies are inferred from the claim text.