PROBLEM TO BE SOLVED: To provide an electrically-driven power steering device capable of generating a larger brake torque as conventional one to an electrically-driven assist motor, even when the electrically-driven assist motor is rotated by an external input at a high speed.SOLUTION: An electrically-driven power steering device comprises: a motor driving circuit (30) having each connection point of a three-phase bridge circuit BC and an upper arm/lower arm element, and an inter-phase switching element provided in a conductive passage of each phase of an electrically-driven assist motor; and a steering ECU (20) that switches ON/OFF of the upper arm/lower arm element and the inter-phase switching element. The steering ECU (20) sets the upper arm and the inter-phase switching element to a conductive state when the magnitude of a rotational speed is less than a second rotational speed threshold value during inverse input state, and controls so as to repeat a periodical operation for setting the upper arm element to the conductive state and the inter-phase switching element to a shutdown state after the conductive state when the magnitude of the rotational speed is equal to the second rotational speed threshold value or more.SELECTED DRAWING: Figure 2

    【課題】外部入力によって電動アシストモータが高速で回転する場合においても、その電動アシストモータに従来よりも大きなブレーキトルクを発生させることが可能な電動パワーステアリング装置を提供する【解決手段】3相ブリッジ回路BCと上アーム/下アーム素子の各接続点と電動アシストモータの各相との通電経路に設けられた相間スイッチング素子とを有するモータ駆動回路(30)と、上アーム/下アーム素子及び相間スイッチング素子のオン/オフを切替えるステアリングECU(20)を備え、ステアリングECU(20)は、逆入力状態時において、回転速度の大きさが第2回転速度閾値未満のとき、上アーム素子及び相間スイッチング素子を導通状態に設定し、回転速度の大きさが第2回転速度閾値以上のとき、上アーム素子を導通状態に、相間スイッチング素子を導通状態の後に遮断状態とする周期的な動作を繰り返すように制御する。【選択図】図2


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    Titel :

    ELECTRICALLY-DRIVEN POWER STEERING DEVICE


    Weitere Titelangaben:

    電動パワーステアリング装置


    Beteiligte:
    OKUDA MASATAKA (Autor:in)

    Erscheinungsdatum :

    21.06.2018


    Medientyp :

    Patent


    Format :

    Elektronische Ressource


    Sprache :

    Japanisch


    Klassifikation :

    IPC:    H02M APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS , Anlagen zur Umformung von Wechselstrom in Wechselstrom, von Wechselstrom in Gleichstrom oder umgekehrt, oder von Gleichstrom in Gleichstrom und zur Verwendung in Netzen oder ähnlichen Stromversorgungssystemen / H02P CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS , Steuern oder Regeln von elektrischen Motoren, elektrischen Generatoren, dynamoelektrischen Umformern / B62D MOTOR VEHICLES , Motorfahrzeuge



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