way of a gear 17 with a gear ratio factor i l2 on the steering gear 3 i l2 u03b4 m 18 gear 2 and gear 17 are illustrated herein as two individual u2018 gears u2019 only for representation purposes however the two gear ratios of gears 2 and 17 are preferably realized by way of one single gear unit in particular a planetary gear as can be taken from fig1 already the additional steering angle u03b4 u03b4 which shall be considered as an external intervention of the driving dynamics controller 6 is additively superimposed at 58 on the nominal steering angle u03b4 drv of the basic steering function the nominal steering angle value u03b4 l nominal resulting from this addition is sent to the control of the superimposed steering a sum steering angle u03b4 l 21 is the result of the additive superposition of driver 39 s steering angle and superimposed steering angle generated by the actuator from which sum steering angle a resulting steering angle u03b4 v is produced by the steering gear 3 as a resulting output quantity and acts on the vehicle corresponding to the desired learning function the sum steering angle u03b4 l 21 is furnished to the steering controller 10 as an input quantity at 22 just as the additional steering angle u03b4 m 23 the sum steering.