Eaton Corporation

Mark A Boardman

Jon A Steeby

Warren R Dedow

A shift control system is provided that is suitable for semi-automatic transmissions in heavy duty vehicles. The torque modulation system includes logic circuitry that employs a ramping torque function or algorithm to control the acceleration of torque, both positive and negative, and/or provides a longer dwell time in the torque clutch disengagement range. Moreover, dwell time at peak is not required. A method for improving gear disengagement and shift control in accordance with the principles of the invention is also disclosed.

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Portage, MI, United States of America

Mark A Boardman