VEHICLE STEERING CONTROL DEVICE AND STEERING CONTROL METHOD

摘要

A vehicle steering control apparatus and vehicle steering control method are provided, in which it is possible to suppress a steering state of a steering operation element from being different from the driver's intention, in starting the driving source. A backup clutch, which is switchable between a release state where a torque transmission path is mechanically decoupled and an engagement state where the torque transmission path is mechanically coupled, is set to the engagement state in starting the engine. When the steering torque detected after the engine starts becomes equal to or lower than a clutch release start torque Ts1, the backup clutch in the engagement state is switched to the release state. When the state of the backup clutch is set to the engagement state, a steering assistance torque of assisting the turning of the turning wheels is output from the turning motor for turning the turning wheels in response to the operation of a steering operation element. When the backup clutch in the engagement state is switched to the release state, the turning torque depending on a target turning angle in response to the operation of the steering operation element is output from the turning motor, so as to control driving of the turning motor.