PROBLEM TO BE SOLVED: To provide a technique which can accurately grasp a rotation angle of an electric motor without providing a mechanical positional displacement prevention mechanism.SOLUTION: An electric power steering device includes: a three-phase brushless electric motor 110 having a resolver 120; a motor rotation angle calculation part 35 which calculates a rotation angle of the electric motor 110 based on an output value from the resolver 120; a torque sensor for detecting a steering torque of a steering wheel; a target current calculation part 20 which conducts a predetermined direct current between two specific phases of the electric motor 110; a rotation angle correction part 36 which corrects a rotation angle calculated by the motor rotation angle calculation part 35 based on a difference between the rotation angle calculated by the motor rotation angle calculation part 35 and a predetermined angle when the target current calculation part conducts said predetermined direct current; and a motor drive control part 31 which controls drive of the electric motor 110 based on the corrected rotation angle after correction by the rotation angle correction part 36.
【課題】メカニカルな位置ズレ防止機構を設けることなく電動モータの回転角度を精度高く把握できる技術を提供する。【解決手段】レゾルバ120を有する3相ブラシレスの電動モータ110と、レゾルバ120からの出力値に基づいて電動モータ110の回転角度を算出するモータ回転角度算出部35と、ステアリングホイールの操舵トルクを検出するトルクセンサと、電動モータ110の特定の2相間に所定の直流電流を通電する目標電流算出部と、目標電流算出部が所定の直流電流を通電した際にモータ回転角度算出部35が算出した回転角度と予め定められた角度との差に基づいてモータ回転角度算出部35が算出した回転角度を補正する回転角度補正部36と、回転角度補正部36が補正した補正後の回転角度に基づいて電動モータ110の駆動を制御するモータ駆動制御部31とを備える。【選択図】図5
ELECTRIC POWER STEERING DEVICE, RESOLVER FAILURE DETECTION DEVICE, RESOLVER FAILURE DETECTING METHOD
電動パワーステアリング装置、レゾルバ故障検出装置、レゾルバ故障検出方法
2015-09-03
Patent
Electronic Resource
Japanese
IPC: | B62D MOTOR VEHICLES , Motorfahrzeuge |
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