A steering system includes a rotary shaft to which an operation member is coupled; a first actuator; a second actuator; a control unit; and a moving unit configured to move the operation member between a normal position and a storage area. The control unit is configured to switch between a manual drive mode and an autonomous drive mode. The control unit is configured to, when moving the operation member from the storage area to the normal position, start synchronous control when the operation member satisfies a predetermined condition before the operation member reaches the normal position, the synchronous control being control in which the control unit controls the first actuator to change a rotation angle of the rotary shaft to an angle corresponding to a steered angle of steered wheels driven by the second actuator.

A steering control device includes control circuitry configured to perform synchronization control. The synchronization control includes a target synchronization angle calculating process of calculating a target synchronization angle that is a steering-side rotation angle satisfying a predetermined correspondence relationship with respect to a turning-side rotation angle; a target relay angle calculating process of calculating a target relay angle that is located closer to a first side in a circumferential direction than a first-side angle is, the first-side angle being one of the steering-side rotation angle and the target synchronization angle and being located closer to the first side than another of the steering-side rotation angle and the target synchronization angle is; and a motor driving process of operating a steering-side motor such that the steering-side rotation angle reaches the target synchronization angle after operating the steering-side motor such that the steering-side rotation angle reaches the target relay angle.

An ADK is attachable to and removable from a VP and issues an instruction for autonomous driving to the VP. The VP includes a steering system for steering of the VP. (An ADS of) the ADK includes a compute assembly and a communication module configured to communicate with the VP. The compute assembly obtains from the VP, a torque value relating to a steering system 33 through the communication module and transmits to the VP, a wheel steer angle command indicating the wheel steer angle in accordance with a driving plan for autonomous driving and the obtained torque value. Even when a user intervenes with an operation while the attachable and removable ADK that issues the instruction for autonomous driving controls the VP, stable steering can be achieved.

An ADS performs processing including setting an initial value of a wheel steer angle command when an autonomous state has been set to an autonomous mode, obtaining a limitation of a rate, setting a wheel steer angle limitation as the wheel steer angle command when magnitude of the initial value is larger than the wheel steer angle limitation, and transmitting the wheel steer angle command.

An all-wheel steering system for a motor vehicle is described which has an active front axle steering system and an active rear axle steering system. The front axle steering system includes a gear ratio unit which is coupled to a steering wheel. The gear ratio unit is configured to define a front axle steering angle as a function of a steering wheel angle and a front axle steering ratio. In addition, the gear ratio unit is coupled to the rear axle steering system in such a way that the front axle steering ratio is adjustable as a function of a rear axle steering angle. Further, a motor vehicle having such an all-wheel steering system is discussed. Also presented is a method of operating an all-wheel steering system for a motor vehicle.

According to the present disclosure, a steering system and method for a machine includes a vehicle control system configured to command steering of the machine, and a steering sensor in communication with the vehicle control system. The steering sensor is configured to detect a position of a steering actuator of the machine. The vehicle control system is configured to detect an acceleration rate of the machine and to command steering of the machine based at least in part on the position of the steering actuator and the acceleration rate of the machine.

A steering control method for a vehicle including a steer-by-wire type wheel-turning mechanism in which a steering wheel and steered wheels are mechanically disconnected, the method including: detecting an actual steering angle of the steering wheel; calculating a target steering angle of the steering wheel on a basis of a target wheel-turning angle of the steered wheels; applying a steering reaction force to the steering wheel according to an angle deviation between the actual steering angle and the target steering angle; detecting a steering operation of the steering wheel by a driver; and when the steering operation by the driver is detected, reducing the steering reaction force according to the angle deviation compared with when the steering operation by the driver is not detected.

A steer-by-wire steering system for a vehicle, including: an operating member operable by a driver; a steering device including an electric motor and configured to steer a wheel by a force generated by the electric motor; a controller configured to control the steering device, wherein the controller enables the wheel to be steered in accordance with an operation of the operating member while imposing limitation on a supply current to the electric motor, and wherein the limitation imposed on the supply current is made smaller when a running speed of the vehicle is lower than a set speed and a steering motion of the wheel is a motion in a direction to decrease a steering amount than i) when the running speed of the vehicle is not lower than the set speed and ii) when the steering motion of the wheel is a motion in a direction to increase the steering amount.

A vehicle steering device capable of stabilizing behavior of a vehicle when traveling backward. The device includes a reaction force device configured to apply steering reaction force to a wheel, a drive device configured to turn tires in accordance with steering of the wheel, and a control unit configured to control the reaction force device and the drive device. The control unit includes a turning ratio map unit configured to set a turning ratio gain in accordance with the vehicle speed of a vehicle, and a target turning angle generation unit configured to generate a target turning angle by multiplying the steering angle of the wheel by the turning ratio gain. The turning ratio gain at backward traveling of the vehicle is equal to or larger than the turning ratio gain at forward traveling of the vehicle.

A hydraulic auxiliary axle steering control system is provided. In detail, there is provided a hydraulic auxiliary axle steering control system that can perform quick, precise, and safe control by changing an auxiliary axle steering control angle in accordance with a vehicle speed to problems with instability of driving, wear of tires, and a turning radius when a vehicle is driven at a low speed.