Hydraulic control apparatus of automatic transmission

Details Hydraulic control apparatus of automatic transmission Hydraulic control apparatus of automatic transmission

2008-04-29

2008-04-29

Wright, Dirk (Department: 3681)

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

Reexamination Certificate

active

11358026

ABSTRACT:
A hydraulic control apparatus is improved in reliability during a garage shifting with reducing costs of the apparatus. An electronic control unit controls equalizing the shift pattern (on-off pattern) during a first garage shifting when a manual valve is shifted from the neutral position to a drive position to the shift pattern during a second garage shifting when the manual valve is shifted from the neutral position to the reverse position. A control valve unit controls the hydraulic pressure applied to a first engagement element during the first garage shifting while controlling the hydraulic pressure applied to a second engagement element during the second garage shifting.

REFERENCES:
patent: 5367922 (1994-11-01), Jan
patent: 5797821 (1998-08-01), Fujimoto et al.
patent: 5895334 (1999-04-01), Yu
patent: 6183393 (2001-02-01), Habeck
patent: 2004-116734 (2004-04-01), None

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