Gm Global Technolgoy Operations, Inc.

Lars Mikael Buur

Christopher E Whitney

Krishnendu Kar

Jeremy V Horgan

Ryan Z Goode

Scott A Hearld

A powertrain system includes an engine control module that generates a negative torque transition signal based on a pending negative torque event of an engine. A transmission control module receives the negative torque transition signal from the engine control module. The transmission control module increases a slip speed of a torque converter clutch in preparation for the pending negative torque event by adjusting pressure in the torque converter clutch prior to the pending negative torque event. The transmission control module decreases the slip speed in the torque converter clutch based on completion of a transition at least one of to the pending negative torque event and from the pending negative torque event.

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Brighton, MI, United States of America

Lars Mikael Buur