Ford Global Technolgoies, LLC

Than Pham

Richard Reynolds Hathaway

Jeffrey James Tumavitch

Markian Oleh Diakiw

Joseph Scott Slayton

Kevin MacFarlane

Barbara Anne Hartline

Michael Tarrant

Timothy Merlino

In a special operating mode, a controller is programmed to disengage a hydraulically actuated park mechanism without use of engine power. The starter motor is used to rotate the engine-driven pump at sufficient speed to command disengagement of Park. Once park is disengaged, a holding pin is used to maintain the out of park condition without hydraulic pressure or flow.

Method for disengaging hydraulic park without engine power

A method for executing a downshift in a transmission includes starting disengagement of a second control element after starting disengagement of a first element. Disengagement of the second element starts before starting engagement of a fourth element. A third element is forced to synchronous speed by beginning engagement of the fourth element before engaging the third element. Engagement of the third and fourth elements is completed at the end of the downshift.

Control of sequential downshifts in a transmission

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Livonia, MI, United States of America

Than Pham