Gm Global Technolgoy Operations, Inc.

Jon M Huber

Carl A Lentz

John A Hibner

Christopher R Wiles

The disengagement of the off-going clutch is monitored to determine as early as possible if there is a clutch tie-up due to failure to disengage. Beginning at the initial clutch release command, the turbine speed and output speed are used to determine if clutch slip has occurred and a pass signal is given if slip occurs in several consecutive control loops. Beginning a preset time after the command to fully exhaust the clutch, the number of no-slip conditions are counted. A fail signal is given when a set number of no-slip conditions are counted.

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Plainfield, IN, United States of America

Jon M Huber