Hydraulic control system with variably regulated line pressure

Details Hydraulic control system with variably regulated line pressure Hydraulic control system with variably regulated line pressure

2006-02-27

2009-02-03

Le, David D. (Department: 3681)

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

C475S120000, C475S123000, C477S163000

Reexamination Certificate

active

07485062

ABSTRACT:
A hydraulic control system for an automatic transmission includes a planetary gear system having a plurality of clutch elements that alters the torque ratio of the transmission. The hydraulic control system includes a line pressure control device for regulating a variable hydraulic line pressure from a maximum line pressure to a fixed fluid line pressure that is lower than the maximum line pressure when an overdrive clutch is applied in a high gear.

REFERENCES:
patent: 4541308 (1985-09-01), Person et al.
patent: 5460582 (1995-10-01), Palansky et al.
patent: 5890509 (1999-04-01), Becker et al.
patent: 6471613 (2002-10-01), Botosan et al.
U.S. Appl. No. 10/916,893, filed Aug. 12, 2004, Kanafani et al.

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