Transmission downshift control method

Details Transmission downshift control method Transmission downshift control method

2006-09-29

2009-10-27

Estremsky, Sherry L (Department: 3655)

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

C477S161000

Reexamination Certificate

active

07608013

ABSTRACT:
A method of controlling a downshift in a transmission having a main box and a compounder that has at least one gearset and at least one friction element separate from the main box includes initiating an upshift in the compounder including application of at least one friction element (e.g. a clutch) in the compounder, and releasing a friction element (e.g. a clutch) in the main box providing a swap shift. The speed phase in the compounder may trigger the speed phase in the main box, and vice versa. Target fluid volumes in one or both of a clutch being released in the main box and a clutch being applied in the compounder may be controlled and adjusted, if necessary, as a function of specific event timing in prior shifts.

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