Method of clutch actuation for hybrid transmissions

Details Method of clutch actuation for hybrid transmissions Method of clutch actuation for hybrid transmissions

2009-05-19

2011-11-29

Shriver, II, J. Allen (Department: 3618)

Interrelated power delivery controls, including engine control

Clutch control

Condition responsive control

Reexamination Certificate

active

08066620

ABSTRACT:
A method of actuating a clutch includes commanding a shift, monitoring slip speed, beginning synchronization, filling to a pre-fill volume, and holding at the pre-fill volume. After slip speed reaches a trigger point, the clutch is filled to a first predicted touch point volume, which is greater than the pre-fill volume. The pre-fill volume is approximately 80 to 90 percent of the first predicted touch point volume. The method may determine slip speed derivative, and set the trigger point based thereupon. The method may monitor actual touch point volume and calculate a flow model, which is used to determine when the pre-fill volume has been reached. Filling the clutch to the pre-fill volume may begin simultaneously with commanding the shift. Pressure is generated by an auxiliary pump, which receives power from sources other than an internal combustion engine.

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