Vehicle steering system

Vehicle steering system, comprising a manual steering handle operable by a vehicle driver, an adjusting assembly operatively connected with steered vehicle wheels as part of a steering drive, the steering handle being operatively connected with the steered vehicle wheels via a controller arrangement having an input side connected to a desired value generator operatively associated with the steering handle for a steering angle to be set by the vehicle driver as well as to an actual value generator which records a steering angle of the steered vehicle wheels, an output of the controller arrangement being configured to control the adjusting assembly as a function of compared desired and actual values, a motor constituting a manual force adjuster operatively connected with the steering handle to simulate a steering resistance on the steering handle, wherein the steering handle and the motor are connected via a shaft to the steering drive, with the motor being arranged to be controlled as a function of the compared actual value signal and desired-value generator signal, the shaft has parts respectively connected with the motor and the steering handle rotatable relative to one another against an elastic resistance, whereby the actual value signal for a manual force is generatable from the extent and the direction of relative rotation between the shaft parts, and a mechanical through-drive is configured to become upon a malfunction of the controlling device and extends via the shaft, and is non-operative during a correct functioning of the controlling device, and the motor is configured to be controlled as a function of the extent and the direction of the relative rotation between the shaft parts.