Speed stage shifting of automatic transmission by reduction of s

Details Speed stage shifting of automatic transmission by reduction of s Speed stage shifting of automatic transmission by reduction of s

1992-09-29

1994-11-15

Wright, Dirk

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

3644241, 477156, F16H 6106, F16H 6108

Patent

active

053637240

ABSTRACT:
In a certain speed stage shifting of an automatic transmission of a vehicle including a speed change gear mechanism including rotary members such as gears and gear carriers and hydraulically operated friction engaging brakes and clutches adapted to provide various speed stages according to selective engagement and disengagement of the friction engaging brakes and clutches, the servo oil pressure of a first friction engaging brake is immediately lowered down to a stand-by pressure marginally higher than a threshold pressure bordering non sliding and sliding of the first friction engaging brake at the start of a change-over of a second friction engaging brake is and then, when a substantial change-over of the second friction engaging means started, the servo oil pressure is further lowered across the threshold pressure and thereafter periodically lowered by a decrement the magnitude of which may desirably be increased along with a lapse of time.

REFERENCES:
patent: 4722247 (1988-02-01), Shindo et al.
patent: 4727772 (1988-03-01), Sumiya et al.
patent: 4793216 (1988-12-01), Hiramatsu et al.
patent: 5072390 (1991-12-01), Lentz et al.
patent: 5085105 (1993-02-01), Wakahara et al.
patent: 5207122 (1993-05-01), Minagawa
patent: 5282401 (1994-02-01), Hebbale et al.

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