Conti Temic Microelectronic Gmbh

Bayerische Motoren Werke Aktiengesellschaft

Getrag Getriebe- Und Zahnradfabrik Hermann Hagenmeyer Gmbh & Cie Kg

Volkswagen Ag

Rainer Rinck

Josef Glatthaar

Tobias Soller

Armin Tonn

Markus Schuerlein

Volker Gaertner

Volker Wehren

Helge Dittrich

Andreas Pawlenka

Markus Schürlein

Markus Jung

A method for adjusting the point of engagement of a friction clutch of a step-variable transmission for a motor vehicle, in particular a friction clutch of a dual clutch transmission. The friction clutch is controllably actuated by means of a clutch actuator and at least one synchronizer shifting clutch is controllably actuated by means of a shift actuator for the engagement and disengagement of a gear ratio of the spur-gear transmission. A set-point of the clutch actuator for the point of engagement of the friction clutch is adjusted as a function of a speed gradient value, which ensues from a transitional state with the friction clutch actuated and the shifting clutch actuated, once the shifting clutch is opened. The transitional state is established by setting the clutch actuator and the shift actuator to a respective transitional value substantially at the same time or, at least in sections, in parallel.

Method for kiss point adaptation

A velocity and acceleration are measured () in a method for determining a vehicle reference velocity, said vehicle reference velocity being used for determining and selecting a suitable transmission ratio. If a measured acceleration (a) exceeds () a maximally possible acceleration (a), a vehicle reference acceleration (a) is determined depending on said exceeding. For this purpose, an acceleration correction value (BKF) is calculated () by means of which acceleration correction value a vehicle reference acceleration is calculated (). The vehicle reference velocity (v) is determined () by means of the vehicle reference acceleration (a). A gearbox transmission ratio is determined () by means of the determined vehicle reference velocity. This branch of the procedure represents the case in which at least one wheel equipped with sensors slips.

Method for determining a vehicle reference velocity

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Hersbruck, Germany

Rainer Rinck