Gm Global Technolgoy Operations, Inc.

Adam Opel Ag

Hans Kleila

Gernot Becker

Rainer Reitenbach

A method is provided for controlling an automatic transmission of a motor vehicle, in which the engine speed is limited after a cold start and a normal shift point is used for shifting to the next higher gear of the automatic transmission in the case of an average operating temperature of an engine, before the average operating temperature is reached, a cold shift point being used for shifting to the next higher gear of the automatic transmission, in the case of which upshifting is performed at a lower vehicle velocity than in the case of the normal shift point. Upshifting into the next higher gear of the automatic transmission can be made easier, since upshifting can already be performed at lower vehicle velocities and therefore lower engine speeds in the cold start phase.

Method for controlling an automatic transmission of a motor vehicle after a cold start and transmission system

The invention concerns a process for controlling a CVT in a motor vehicle. In order to avoid an uncomfortable excitation of a transmission ratio change of the CVT when the driving speed is constant it is proposed that in the case of small accelerator pedal changes (<a) and in the case of changes in driving speed (S) occurring within a calibrated range (S <S<S ) the transmission ratio of the CVT be held constant.

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Russelsheim, Germany

Hans Kleila