An independent steering mechanism of controllable hydraulic locking type for left and right wheels is provided. The independent steering mechanism includes a power steering mechanism, a steering drive mechanism, a hydraulic locking mechanism and an electronic control unit. Power of the left and right steering motors flows through the worm, the worm gear, the gear to drive left and right racks to translate. Outer ends of the left and right racks are connected to left and right tie rods via spherical hinges respectively. Inner ends of the left and right racks are connected to a piston rod and a cylinder barrel via spherical hinges respectively. A left chamber and a right chamber in the hydraulic cylinder are connected to an oil reservoir via an electro-hydraulic valve. The left and right steering motor controllers for the left and right steering motor and the electro-hydraulic valve controller are communicated via CAN bus.

A steering securing arrangement includes comprising a rod, a housing and a blocking unit, the rod being guided on the housing along an actuating axis, the blocking unit configured to be moved into a first state, in which the blocking unit is out of engagement with the rod, the blocking unit being further configured to be moved into a second state, in which the blocking unit is in engagement with the rod and secures the rod against movement along the actuating axis.

Relates to a cylinder unit includes a rod and a housing, wherein the rod is guided on the housing so as to be displaceable along an adjustment axis, wherein a piston is fixed to the rod, which piston divides the interior space of the housing into a first chamber and a second chamber, wherein the housing has a safety outlet, and wherein the safety outlet is arranged such that the piston closes off the safety outlet in fluid-tight fashion when the rod is in a zero position.

An independent steering mechanism of controllable hydraulic locking type for left and right wheels is provided. The independent steering mechanism includes a power steering mechanism, a steering drive mechanism, a hydraulic locking mechanism and an electronic control unit. Power of the left and right steering motors flows through the worm, the worm gear, the gear to drive left and right racks to translate. Outer ends of the left and right racks are connected to left and right tie rods via spherical hinges respectively. Inner ends of the left and right racks are connected to a piston rod and a cylinder barrel via spherical hinges respectively. A left chamber and a right chamber in the hydraulic cylinder are connected to an oil reservoir via an electro-hydraulic valve. The left and right steering motor controllers for the left and right steering motor and the electro-hydraulic valve controller are communicated via CAN bus.

A method for operating a steering mechanism (12) of a motor vehicle, wherein a steering rod (27) can be held or displaced along its longitudinal axis (a) by an electric motor (22) so that the wheel steering angle (8, 9) of at least one wheel (5, 6) on at least one vehicle axle (1) can be maintained or changed. When a force (F.sub.ext) acts essentially axially on the steering rod (27), displacement of the steering rod (27) is at least inhibited by a detent torque (RM) of the electric motor (22) and/or by a self-induced torque (M.sub.sip) of the electric motor. The invention also relates to a device for carrying out the method and to a steering mechanism, which is preferably in the form of a steer-by-wire steering system. A control unit is provided for carrying out the method.

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.

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.

Provided is a method for controlling rear wheel steering provided for a vehicle. The method includes: recognizing an abnormal condition of a sensor; calculating a speed of a vehicle; calculating a steering angular velocity of the vehicle; calculating torque of a steering column of the vehicle; determining a curvature of a lane along which the vehicle is traveling; and determining a rear wheel steering angle of the vehicle based on the speed of the vehicle, the steering angular velocity, the torque of the steering column, and the curvature of the lane.

Aspects of the present invention relate to a control system for controlling an actuator of a rear wheel steering system of a vehicle. The control system is configured to receive first and second input signals indicative of vehicle speed and power mode of a power unit of the vehicle. The control system determines the speed of the vehicle and if the power mode changes. If the vehicle speed is greater than zero and the power mode changes from on to off, the control system outputs an actuator control signal comprising an actuator displacement position request equal to zero. Aspects of the present invention also relate to a method, a system, a vehicle, and computer software and hardware for controlling a rear wheel steering system.

An electromechanical dual steering system for a utility vehicle includes two steering systems, each having a drive unit for actuating one steering linkage each for wheels of the utility vehicle. Each drive unit has an electric motor. The dual steering system has a main power supply for supplying the electric motors with energy. The electromechanical dual steering system is characterized in that the dual steering system has at least one emergency power supply for supplying at least one electric motor with energy in the event that the main power supply fails.