| 摘要 |
PURPOSE:To reduce the load of an actuator so as to effect downsizing by making a correct judgement of the load condition of the actuator for steering the rear wheels in the critical range in controlling the rear wheel steering. CONSTITUTION:A motor 31 as a rear wheel steering actuator is driven by the electric signal from a control unit 50, and the automatic steering is executed by driving the rear wheels against the gripping force. The load condition of the motor is presumed by the acceleration or the like of the vehicle while the vehicle is traveling, and if the motor load judges the excessive critical range, the steering control in the direction where the rear wheels are further steered is stopped, and the rear wheel steering angle is kept to the value immediately before the motor load becomes excessive, and the control of the rear wheel steering is re-started after the target rear wheel steering angle becomes not greater than the kept rear wheel steering angle in steering-back. |
