ELECTRIC POWER STEERING SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a low-cost angle detector which effectively uses space in the axial direction of a steering shaft and accurately detects an absolute angle over a lock-to-lock full range of a steering wheel by providing a worm wheel in a reducer with a rotary potentiometer. SOLUTION: The electric power steering system provides the steering shaft with steering assistance by transmitting the torque of an electric motor through the reducer on the basis of a steering torque detected by a torque sensor. The reducer is provided with the rotary potentiometer. A part of an oscillating arm of the potentiometer engages with a spiral groove provided on the side surface of the worm wheel within the reducer, while providing the oscillating arm with oscillatory rotation according to the rotation of the worm wheel to detect the rotation angle of the steering shaft. COPYRIGHT: (C)2005,JPO&NCIPI