Dr. Ing. H.c. F. Porsche Aktiengesellschaft

Dario Düsterloh

Georg Tardy-Tuch

A method for 'hands-on' identification on a steering system having two subsystems connected to one another by an elastic connection. The elastic connection has a static friction state and a sliding friction state for a respective set of external state variables. The steering system is excited by an excitation vibration, which is generated by a controllable vibration generator and has a respective excitation amplitude and a respective excitation frequency, for a respective set of external state variables, in which the respective excitation amplitude and the respective excitation frequency for the currently present set of external state variables are taken from a prescribed table and the vibration generator is controlled with them. A reaction torque to the excitation vibration is measured using a sensor. A phase difference between the excitation vibration and the reaction torque is calculated to identify a 'hands-off' state as well as a &#x201c;hands-on&#x201d; state.

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Vaihingen an der Enz, Germany

Dario Düsterloh