PROBLEM TO BE SOLVED: To provide an electric power steering device which can detect an abnormal situation in which deviation occurs in a correspondence relationship between rotational angle information which is detected by a rotation angle detection device and an actual steering angle of a steering wheel.SOLUTION: The electric power steering device comprises a torque sensor 30 which is arranged at a column shaft, and detects steering torque Th, a motor which imparts an assist force to the column shaft, and a rotation angle detection device 44 which detects a rotation angle θe of an output shaft 21a of the motor. The rotation angle detection device 44 comprises a rotation detection part 61 which changes a value of a counter 61a on the basis of the motor rotation angle θe, and an abnormality detection part 62 which detects an abnormality on the basis of the steering torque Th which is detected by the torque sensor 30, and the value of the counter 61a. A microcomputer 40 calculates a steering angle on the basis of the value of the counter 61a. When the abnormality detection part 62 detects a change of the value of the counter 61a, the abnormality detection part detects the abnormality on the basis that the steering torque Th is smaller than a prescribed threshold.SELECTED DRAWING: Figure 3
【課題】回転角検出装置により検出される回転角情報と転舵輪の実際の転舵角との間の対応関係にずれの生じる異常な状況を検出することのできる電動パワーステアリング装置を提供する。【解決手段】電動パワーステアリング装置は、コラムシャフトに設けられ操舵トルクThを検出するトルクセンサ30と、コラムシャフトにアシスト力を付与するモータと、モータの出力軸21aの回転角θeを検出する回転角検出装置44とを備える。回転角検出装置44は、モータ回転角θeに基づきカウンタ61aの値を変化させる回転検出部61と、トルクセンサ30により検出される操舵トルクTh及びカウンタ61aの値に基づき異常を検出する異常検出部62とを備える。マイコン40は、カウンタ61aの値に基づき操舵角を演算する。異常検出部62は、カウンタ61aの値の変化を検出した際、操舵トルクThが所定の閾値未満であることに基づき異常を検出する。【選択図】図3
STEERING DEVICE AND ELECTRIC POWER STEERING DEVICE
ステアリング装置及び電動パワーステアリング装置
2016-04-21
Patent
Electronic Resource
Japanese
IPC: | B62D MOTOR VEHICLES , Motorfahrzeuge |
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