A method is disclosed for a steer-by-wire steering system of a motor vehicle, the system having at least one steering function that requests one or more steering angle changes as target steering angles for at least at one vehicle axle. An arbitration unit (AE) weights the steering angle changes as target steering angles (SLw_i) and, taking into account at least one target steering angle (SLw_i), determines an overall target steering angle (G_SLw). Before the overall target steering angle (G_SLw) is set by an actuator of the steer-by-wire steering system, a check is carried out to see whether a gradient of the overall target steering angle (G_SLw) is smaller than or equal to the gradient of the at least one target steering angle (SLw_i).

A hydraulic rear axle steering for multi-axle vehicles, including a steering cylinder with a piston and two working chambers. The steering cylinder has a mechanical blocking device, which blocks the piston when it reaches a central position within the steering cylinder. The blocking device has a blocking member, which is retained in an engaged position by a locking element in the blocked state. The locking element is movable by a separate, hydraulically actuated actuator between a blocking position and a first unblocking position in which the locking element releases the blocking element. An admission-pressure-controlled load safety valve is provided for each working chamber, and control connections of the valves are connected to a pressure line leading to the respective other working chamber. The actuator is adjusted such that, when a lower, first pressure value is applied, the locking element moves into the unblocking position, and the valves are adjusted such that, when a higher, second pressure value is applied, the valves open towards the tank.

An independent steering control apparatus may include: a processor configured to analyze whether wheels are abnormal, on the basis of turning angles of the respective wheels, and revise the turning angles of normal wheels except an abnormal wheel in which a fault occurred, according to the analysis result; and a wheel controller configured to control steering of the wheels according to the turning angles of the wheels, input from the processor.

A method is disclosed for protecting the components of a steer-by-wire steering system, where the steer-by-wire steering system comprises a self-locking spindle drive in which the spindle is displaced linearly by driving a positionally fixed spindle nut in rotation. As a function of the speed of the vehicle, the linear displacement of the spindle relative to the spindle nut is summed continuously with respect to time until a first threshold value has been reached. A control unit, a non-transitory computer-readable storage medium, and a steer-by-wire system are also disclosed.

A chassis actuator (1), in particular for a rear axle steering system, includes a rotational-linear transmission (5) which is provided for coupling, on the output side, to a chassis element, wherein a rotatable, input-side element (9) of the transmission (5) is mounted in a housing (13) by means of at least one axial bearing (16, 17). The transmission (5) is self-lockingly set by means of an adjustable preloading device (21), which loads the axial bearing (16, 17) with an axial force.

An electromagnetic damping system for a steering system includes a pinion gear having a pinion shaft and engaged with a steering rack. The electromagnetic damping system also includes a friction disk operatively coupled to the pinion shaft. The electromagnetic damping system further includes an electromagnetic clutch located adjacent the friction disk, the electromagnetic clutch disposed in a spaced position relative to the friction disk in a first condition of the electromagnetic clutch, the electromagnetic clutch disposed in a contact position relative to the friction disk in a second condition of the electromagnetic clutch to damp the rate of movement of the steering rack.

A hydraulic unit for supplying pressure to a hydraulic steering system is provided having at least two hydraulic cylinders and at least one hydraulic pump (9, 10, 32, 33). It is essential that the hydraulic cylinders are of interacting configuration, by an annular space (6a, 6a, 28a, 28b) of the first hydraulic cylinder being connected via at least one hydraulic line to an annular space (6a, 6a, 28a, 28b) of the second hydraulic cylinder, and a piston space (5a, 5b, 29a, 29b) of the first hydraulic cylinder being connected via at least one hydraulic line to a piston space (5a, 5b, 29a, 29b) of the second hydraulic cylinder, and a hydraulic pump (9, 10, 32, 33) being arranged at least in a hydraulic line (7, 8, 30, 31) between the two annular spaces (6a, 6a, 28a, 28b) or in a hydraulic line (7, 8, 30, 31) between the two piston spaces (5a, 5b, 29a, 29b). Furthermore, the invention relates to methods for operating a hydraulic unit for supplying pressure to a hydraulic steering system, and to a steering system.

A technology of mechanically classifying a switching operation between a traveling mode and a special moving mode is provided to prevent a mode switching misoperation. A traveling mode switching mechanism of a four-wheel independent steering type vehicle includes a shift gate which is disposed by forming a moving path of a shift lever, and grouping a traveling mode and a special moving mode. Additionally, a mode switching differentiation devices differentiates a mode switching operation of a driver by configuring so that an operation of the shift lever switched between the traveling mode and the special moving mode is physically different from an operation of the shift lever switched between the traveling modes or between the special moving modes.

A steering system for a trailing axle of a motor vehicle includes an electric motor, a hydraulic pump, a first valve, and a working cylinder. The electric motor is configured to drive the hydraulic pump. The working cylinder has a central bore and a piston positioned in the working cylinder. The first valve is fluidically connected to the pump such that the first valve is configured to block flow between the central bore and the pump in response to pressure generated by the pump, and to release the flow in response to a non-pressurized state of the pump in order to divert hydraulic fluid from the working cylinder through the central bore via an adhesion-driven movement of the piston into a central position in the central bore. A method includes operating a steering system for a trailing axle of a motor vehicle of this type.

The present disclosure relates to a rear-wheel steering system and a controlling method thereof. The rear-wheel steering system includes: a rack configured to transmit a driving force generated from a rear-wheel steering motor to rear wheels; a first correction module configured to, when an engine is started, detect a position of the rack using a displacement sensor and calculate a first correction value that is a difference between the detected position and a neutral position; a second correction module configured to, when the engine is started, detect a position of the rack using a motor position sensor that detects a rotation angle of the rear-wheel steering motor and calculate a second correction value that is a difference between the detected position and the neutral position; a comparison determiner configured to compare the first correction value and the second correction value to determine whether the displacement sensor has malfunctioned; and a steering controller configured to control an operation of the rear-wheel steering motor. Accordingly, it is possible to determine whether an error occurs in the displacement sensor and to return the rack to the neutral position even when the error has occurred in the displacement sensor.