STEERING CONTROL DEVICE FOR VEHICLE

To provide a steering control device that is able to properly adjust a rigidity balance in a steering direction of front and rear wheels in a vehicle capable of four-wheel steering by a steer-by-wire system.SOLUTION: A steering control device for a vehicle of a four-wheel steer-by-wire system includ...

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Bibliographische Detailangaben
Hauptverfasser: KAMEDA YOSHIKAZU, MIYAZAKI NOBUAKI, NAKATSU CHIKATOSHI, OUCHI MIYUKI, DEGUCHI SHOTA
Format: Patent
Sprache:eng ; jpn
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Beschreibung
Zusammenfassung:To provide a steering control device that is able to properly adjust a rigidity balance in a steering direction of front and rear wheels in a vehicle capable of four-wheel steering by a steer-by-wire system.SOLUTION: A steering control device for a vehicle of a four-wheel steer-by-wire system includes a control device that controls operations of a front-wheel steering device and a rear-wheel steering device. The control device calculates a target front steering angle and a target rear steering angle using a steering angle of the vehicle; and calculates a control signal for the front-wheel steering device that is expressed as a feedback function including a product of a deviation between the target front steering angle and a front actual steering angle and a front proportional gain, and a control signal for the rear-wheel steering device expressed as a feedback function including a product of a deviation between the target rear steering angle and a rear actual steering angle and a rear proportional gain. At the time, the control device sets the front proportional gain and the rear proportional gain such that the rigidity of the rear wheel in a steering direction is greater than the rigidity of the front wheel in the steering direction.SELECTED DRAWING: Figure 4 【課題】ステアバイワイヤ方式での四輪操舵が可能な車両において、前後輪の転舵方向の剛性バランスを適正に調整することを可能とする操舵制御装置を提供する。【解決手段】四輪ステアバイワイヤ方式の車両の操舵制御装置は、前輪転舵装置及び後輪転舵装置の動作を制御する制御装置を備える。制御装置は、車両の操舵角を用いて目標フロント舵角及び目標リア舵角を算出し、目標フロント舵角とフロント実舵角との偏差とフロント比例ゲインとの積を含むフィードバック関数として表される前輪転舵装置の制御信号と、目標リア舵角とリア実舵角との偏差とリア比例ゲインとの積を含むフィードバック関数として表される後輪転舵装置の制御信号と、を演算する。この際、制御装置は、後輪の転舵方向への剛性が前輪の転舵方向への剛性よりも大きくなるように、フロント比例ゲイン及びリア比例ゲインを設定する。【選択図】図4