Method for operating a steering apparatus of a motor vehicle comprising an electromechanical steering-assistance device

A method for operating a steering apparatus of a motor vehicle that includes an electromechanical steering-assistance device, the method comprising:

• detecting interference-induced vibrations which act on a torsion bar of the steering apparatus;
• analyzing a frequency and amplitude of the interference-induced vibrations;
• activating a steering-stabilization function of the steering-assistance device when a limit value for the amplitude of the interference-induced vibrations is exceeded;
• providing, by the steering stabilization function, a drive signal (AS) for an electric motor of the steering-assistance device, so that the electric motor generates a compensation torque Mbar which acts on the torsion bar and at least partially counteracts the interference-induced vibrations;
• forming an indicator (I) from the frequency and the amplitude of the interference-induced vibrations;
• distinguishing carriageway-induced vibrations from vibrations caused by instabilities in the steering apparatus;
• and
• generating the drive signal (AS) for the electric motor in a vibration-dependent manner by combining the indicator (I) with the steering-stabilization function.