Zf Friedrichshafen Ag

Steffen Peine

Magnus Stiefenhofer

A method for operating a motor vehicle having a transmission (), the method including closing a first number of shift elements and opening a second number of shift elements in each selected, force locking gear ratio of the transmission (); closing one shift element less, and therefore opening one shift element more than in a selected, force locking gear ratio when a transmission () is not force locking in the sailing mode; adjusting the respectively closed and opened shift elements as a function of at least one operating condition of the motor vehicle in the sailing mode; and checking, at least on the basis of the rotational speed of the transmission input shaft (), whether a previously closed, positively locking shift element (A, F) to be opened is actually opened in the sailing mode during adjusting of the respectively closed and opened shift elements.

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Eriskirch, Germany

Steffen Peine