Motor vehicle with a device for reducing effective friction in a vehicle steering system

Abstract

Motor vehicle (100) comprising a device for reducing the effective friction in a vehicle steering system (115), wherein the rotor position speed of a steering system motor (120) is monitored and, if a predetermined threshold is undershot, an increasing force profile via the motor set torque is applied to the vehicle steering system (115) until the rotor position speed is again above the threshold, wherein the initial direction of the dynamicizing force is selected depending on the rate of change of the processed torsion bar torque (120) and wherein, during prolonged activity, the sign of the dynamicizing force alternates in such a way as to avoid a directional influence, characterized in that the activation of the dynamicization takes place when road feedback (R), an individual excitation of the road surface and / or an exceedance of a threshold value of the filtered derivative of the torsion bar torque (160) is detected.

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