Adaptive pressure control method for synchronous downshifts...

Details Adaptive pressure control method for synchronous downshifts... Adaptive pressure control method for synchronous downshifts...

2007-05-08

2007-05-08

Black, Thomas (Department: 3661)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Transmission control

C701S058000, C477S068000

Reexamination Certificate

active

10712861

ABSTRACT:
An adaptive pressure control method for synchronous downshifts in an automatic transmission that uses pressure actuated friction elements. The method uses characteristic parameters that determine downshift quality for both power-on downshifts and power-off downshifts. Selected measured variables are monitored to detect changes in the parameters. Adjustments for the friction elements are made in response to changes in the measured variables.

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