Daimler Chrysler Ag

Daimler Ag

Ulrich Eckle

G&uuml;nter W&ouml;rner

Roland Flinspach

Thomas Volz

Bernd Davids

In a method for operating a motor vehicle in the event of a shift of a power divider actuated by external force, before the commencement of the shift of the power divider, a control device reduces the torque at the shifting members involved in the shift. The vehicle transmission is an automatic transmission, and the reduction is achieved a clutch in the automatic transmission is opened. After the conclusion of the shift, a torque is permitted again at said shifting members, and the clutch is closed again. The vehicle driver can consequently execute a shift in the power divider merely by triggering a shift requirement.

Method for operating the drive train of a motor vehicle

In a method for operating a motor vehicle having an automatic transmission in the time of a selection action for a driving-mode range, first a driver's requirement for a change in the driving-mode range is transferred to a selection device, a change signal is then generated by the selection device, the change signal is subsequently transferred to a control unit, and, finally, a change in the driving-mode range of the automatic transmission is brought about by the control unit according to the change signal. In the time of the selection action for the driving-mode range, at least one braking device is actuated in an automated manner by the or a control unit. Drive-train oscillations may be reduced or avoided by the method.

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Donzdorf, Germany

Ulrich Eckle