Schaeffler Technologies Ag & Co .kg

Christian Eberle

Michael Reuschel

Erhard Hodrus

Marian Preisner

Lutz Helmbrecht

A method is provided for controlling a hydraulic control device which can actuate a torque device and includes a first actuating element configured to be acted upon by a first fluid pressure in a first fluid line and configured to actuate the torque device; a system pressure line hydraulically connected to the first fluid line and having a system pressure; a first valve element located between the first fluid line and the system pressure line and configured to the first fluid pressure via the system pressure; and a supply element configured to provide the system pressure and being hydraulically connected to the system pressure line. The method includes setting first fluid pressure based on a predetermined target torque value, and setting the system pressure above the first fluid pressure by a pressure difference based on a pressure control value.

Method for controlling a hydraulic control device

A method for controlling a friction clutch operatively arranged between a drive unit and a gearbox. The method includes the steps of detecting torque transmitted by the friction clutch, determining a coefficient of friction between friction linings of a clutch disk and antifriction surfaces of the friction clutch, and evaluating the functional capability based on the determined coefficient of friction. In order to avoid an evaluation of a friction clutch that has not yet been broken-in as a worn friction clutch, the evaluation is postponed during a specified breaking-in phase of the friction clutch.

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Buehl, Germany

Christian Eberle