Gm Global Technolgoy Operations, Inc.

Rainer Kloesel

Brandon M Fell

Martin Gentile

Henry R Wright

Julian Heinz

Falko Hendrischke

Marcel Wachtel

A method of adjusting deceleration dependent shift points to maintain a target minimum turbine speed includes calculating a vehicle speed offset based on vehicle acceleration rate a predicted downshift delay for the target minimum turbine speed and converting the target minimum turbine speed to a target vehicle speed based on the deceleration condition. Thereafter, the method continues with determining a target gear based on the vehicle speed offset and the target vehicle speed, and downshifting to the target gear having vehicle speed less than or equal to a vehicle speed corresponding to the current turbine speed. The method ends with maintaining the target gear until a shift delay period is greater than a predetermined delay threshold.

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Ruesselsheim, Germany

Rainer Kloesel