PROBLEM TO BE SOLVED: To maintain favourably a steering feeling while suppressing discomfort noise from occurring in a vehicle interior even when a driver is taking the hands off from a steering wheel 13.SOLUTION: A first EPS control device 51A comprises a first hands-off determination portion 93A that determines that a driver is taking the hands off from a steering wheel 13 when steering torque absolute value TRab based on steering torque information VT is less than a first torque threshold TRth1. The first EPS control device 51A, at hands-off determination time when the first hands-off determination portion 93A determines that the driver is taking the hands off from the steering wheel 13, reduces control amounts of an assist motor 35 based on a torque differential signal dVT/dt more than control amounts at non hands-off determination time when the first hands-off determination portion 93A determines that the driver is not taking the hands off from the steering wheel 13.SELECTED DRAWING: Figure 1

    【課題】運転者がステアリングホイール13から手を放している場合であっても、車室内での不快な雑音の発生を抑制しながら、操舵フィーリングを良好に維持する。【解決手段】第1EPS制御装置51Aは、操舵トルク情報VTに基づく操舵トルク絶対値TRabが、第1トルク閾値TRth1未満である際に、運転者がステアリングホイール13から手を放している旨の判定を下す第1手放し判定部93Aを備える。第1EPS制御装置51Aは、第1手放し判定部93Aにより運転者がステアリングホイール13から手を放している旨の判定が下された手放し判定時に、トルク微分信号dVT/dtに基づくアシストモータ35の制御量を、第1手放し判定部93Aにより運転者がステアリングホイール13から手を放していない旨の判定が下された非手放し判定時と比べて低減させる。【選択図】図1


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    Title :

    ELECTRIC POWER STEERING DEVICE


    Additional title:

    電動パワーステアリング装置


    Contributors:

    Publication date :

    2016-06-20


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B62D MOTOR VEHICLES , Motorfahrzeuge



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