A control device and method for controlling a tag axle steering system, configured to steer tag axle wheels of a tag axle, are provided. The method comprises, when the steering angle of the tag axle wheels is offset from a steering angle of a neutral position of the tag axle wheels and in response to a fault signal indicating malfunction of the tag axle steering system, locking the position of the tag axle wheels at a current steering angle of the tag axle wheels. A computer program and a computer-readable medium, as well as a vehicle, are also disclosed.

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.

A system performs a method for operating a vehicle. The system includes a first steering system for a first axle of the vehicle and a processor. The processor determines the first axle to have a misaligned wheel thereon, applies a non-zero steering wheel angle to a steering wheel of the vehicle to maintain the vehicle moving straight with the misaligned wheel, measures a value of the non-zero steering wheel angle, determines a misalignment angle of the misaligned wheel from the value of the non-zero steering wheel angle, determines a reduced travel range for the first axle from a first nominal travel range of the first axle and the misalignment angle and activates the first steering system to steer the vehicle by limiting the movement of the first axle using the reduced travel range. The reduced travel range allows the misaligned wheel to move without contacting the vehicle.