Automatic transmission working fluid pressure control apparatus

Details Automatic transmission working fluid pressure control apparatus Automatic transmission working fluid pressure control apparatus

1997-12-04

1999-07-27

Wright, Dirk

Interrelated power delivery controls, including engine control

Transmission control

Control by sensed ambient condition, pattern indicia,...

475117, F16H 6104

Patent

active

059281081

ABSTRACT:
A fluid pressure control apparatus for use with an automatic transmission having a hydraulic circuit connected to supply a fluid pressure so as to operate selected ones of friction elements in the engaged position and release the fluid pressure so as to operate selected ones of the friction elements in the disengaged positions. The control apparatus controls the fluid pressure to the friction elements according to a shift from a current gear position to a target gear position. The fluid pressure is applied temporarily to disengaged ones of the friction elements so as to exhaust air from the hydraulic circuit.

REFERENCES:
patent: 5127287 (1992-07-01), Taniguchi et al.
patent: 5129422 (1992-07-01), Davison, Jr. et al.
patent: 5327800 (1994-07-01), Van Selous
patent: 5622088 (1997-04-01), Reid

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