JPH0446980U

JPH0446980U -

Info

Publication number: JPH0446980U
Application number: JP8976790U
Authority: JP
Priority date: 1990-08-27
Filing date: 1990-08-27
Publication date: 1992-04-21

Description

[Brief explanation of the drawing]

第１図は本考案に係る電動パワーステアリング
装置を備えた操舵機構周辺の構造を示す模式図、
第２図はそのマイクロコンピユータ及びその周辺
のブロツク図、第３図はモータ電流と荷重のしき
い値との関係を示すグラフ、第４図はマイクロコ
ンピユータの制御内容を示すフローチヤートであ
る。１……操舵輪、７……モータ、９……ロータリ
エンコーダ、８……クラツチ、１２……ラツク軸
、１６……荷重センサ、２０……マイクロコンピ
ユータ、２２……電流検出回路、２４……モータ
駆動回路、２５……フエイルセーフリレー、２６
……クラツチ駆動回路、ＣＬ……電磁コイル。 FIG. 1 is a schematic diagram showing the structure around a steering mechanism equipped with an electric power steering device according to the present invention;
FIG. 2 is a block diagram of the microcomputer and its surroundings, FIG. 3 is a graph showing the relationship between motor current and load threshold, and FIG. 4 is a flowchart showing the control details of the microcomputer. DESCRIPTION OF SYMBOLS 1... Steering wheel, 7... Motor, 9... Rotary encoder, 8... Clutch, 12... Rack shaft, 16... Load sensor, 20... Microcomputer, 22... Current detection circuit, 24... Motor drive circuit, 25...Fail safe relay, 26
...Clutch drive circuit, CL...electromagnetic coil.

Claims

[Claims for Utility Model Registration] In an electric power steering device that drives a steering mechanism by applying the rotational force of a motor that assists steering force to the steering mechanism via a clutch that turns on and off, the motor current of the motor is detected. a current detection means for detecting the load of the steering mechanism; a threshold setting means for setting a threshold value of the load of the steering mechanism corresponding to the motor current; A means for comparing the current with a load threshold corresponding to the detected current, and if the detected load is less than or equal to the load threshold corresponding to the detected current.
An electric power steering device comprising means for disengaging the clutch.