Patent ID: 7845459
Filing Date: 2010-12-07
Classification: B62D

Abstract:
1. An electric power steering apparatus, comprising: a steering mechanism that steers steering wheels in response to a steering operation of a driver's steering wheel; an electric motor that is fitted to the steering mechanism and that rotates using electric power supplied from an electric power supply device to generate a force used to assist the steering operation; and a motor control unit that controls an operation of the electric motor based on a manner in which the steering operation of the driver's steering wheel is performed, wherein the electric power supply device includes at least two electric power supply units connected in parallel, which are a main electric power supply unit and a sub-electric power supply unit that outputs a voltage lower than a voltage output from the main electric power supply unit, the electric power supply device being structured such that electric power is supplied to the electric motor from one of the main electric power supply unit and the sub-electric power supply unit, and the motor control unit includes: