Provided is a vehicle equipped with a steer-by-wire type steering device and designed to ensure that a wheel-turning actuator is activated before the vehicle starts traveling, thereby improving the reliability of steering while the vehicle is traveling. A vehicle 1 includes: a steering member 15 for receiving steering operations; a wheel-turning actuator 19 mechanically separated from the steering member 15 and configured to turn wheels; a state switching device 6 for switching between a fixed state in which the vehicle is fixed at a current position and a release state in which the vehicle is released from being fixed at the current position; and a control device 9 for controlling the wheel-turning actuator 19 and the state switching device 6, wherein the control device permits the state switching device to switch from the fixed state to the release state only on or after completion of activation of the wheel-turning actuator.

An electric multi-mode steer-by-wire system and a mode switching method thereof. The electric multi-mode steer-by-wire system includes a steering hand wheel unit including a steering hand wheel, a road-feeling motor, a reducer and an electromagnetic clutch, a steering execution unit including two steering electric motor mechanisms, a steering gear and two steering road wheels, an electronic control unit configured to control the steering hand wheel unit and the steering execution unit to achieve switching among two-side steering-road-wheel independent steer-by-wire mode, steering-trapezoidal steer-by-wire mode and electric power steering mode, and a mode selection and display unit. The electromagnetic clutch connected to the steering execution unit. The steering electric motor mechanisms drive the steering road wheels to steer independently through lead screw-nut pairs; or respectively form a hydraulic cylinder with the steering gear to jointly or independently drive the steering road wheels to steer with steering-trapezoidal manner.

A steering system (10) for a motor vehicle, which steering system (10) is configured as a steer-by-wire steering system, comprises a rack (14), an electric drive (16) for the longitudinal displacement of the rack (14), and a rotatably mounted supporting element (20) which is spaced apart from the electric drive (16) along the longitudinal axis of the rack (14), and the rotatably mounted supporting element (20) being in toothed engagement with the rack (14).

A steering system for a vehicle according to an example in the present disclosure includes a steering mechanism that is mechanically disconnected from a steering wheel to cause a driving wheel to be turned by a turning motor, and a control device that provides a motor command value to the turning motor. The control device has a two-degree-of-freedom control system including a feed-forward model for converting a target turning angle into a feed-forward value of the motor command value, and a feedback model for converting a difference between the target turning angle and an actual turning angle into a feedback value of the motor command value. A transfer function describing the feed-forward model contains a variable coefficient. The control device changes the variable coefficient of the transfer function based on information about road surface reaction.

The present embodiments may provide a steer-by-wire type steering apparatus which can significantly reduce production cost by reducing the number of components and simplifying the assembly procedure, by eliminating a pinion gear, etc., and sensing the position of a sliding bar on the basis of rotation information detected from a gear box which transfers the rotational force of a motor to the sliding bar.

To prevent a driver from feeling uncomfortable when the driver touches a steering member in a state where a driving source is stopped, a vehicle steering system (1) is provided in a vehicle (2) that travels by a driving force generated by a driving source (51). The vehicle steering system (1) includes; a steering member (10) configured to accept a steering operation; and a reaction force actuator (13) configured to apply a reaction force to the steering member (10) in response to the steering operation. In a state where the driving source (51) is stopped, the reaction force actuator (13) is configured to apply the reaction force to the steering member (10) based on a stopped time position that is a position of the steering member (10) at a time when the driving source (51) is stopped.

A rotation limiting means for a steer-by-wire steering system comprises a fixedly arranged outer housing and a steering column which is received at least partially in the outer housing and can be rotated relative to the outer housing. Furthermore, at least one actuating member is provided which is arranged between the outer housing and the steering column and can be rotated to a limited extent relative to the outer housing and relative to the steering column, in order to mechanically limit a rotation of the steering column relative to the outer housing. Furthermore, a steering system and a method for limiting a rotational movement in a steering system are described.

A steering system includes a housing, a steering operation shaft that is housed in the housing and configured to move in an axial direction to steer right and left steered wheels, a first drive source that generates a first drive force, a second drive source that generates a second drive force, a first power transfer unit that applies an axial force to the steering operation shaft with the first drive source, a second power transfer unit that applies an axial force to the steering operation shaft with the second drive force, a position detection sensor that is provided in the housing and detects an axial position of the steering operation shaft, and a control device that controls the first drive source and the second drive source using a detection result of the position detection sensor.

A steering system for motor vehicles, including a steering actuator which acts on the steered wheels, is electronically controlled based on a steering request and acts on the steered wheels via a steering gear, and an actuator device which transmits reactions to a steering shaft connected to the steering wheel. The steer-by-wire steering system has a holding brake which can be activated electrically and has two positions; a holding position and an open position. The holding brake is configured to block rotation of the steering shaft in the holding position when a predefined rotational angle of the steering shaft is exceeded, and to release rotation of the steering shaft in the open position.

A control device includes control circuits of a plurality of systems. When a transition condition is established, the control circuits of the systems make transition of a driving mode from a first driving mode to a second driving mode, and when a return condition is established in a state in which the driving mode has transitioned to the second driving mode, the control circuits of the systems make transition of the driving mode from the second driving mode to the first driving mode while gradually changing the current command values of the control circuits’ own systems toward the current command values before the adjustment.