Hydraulic control system of a six-speed automatic transmission

Details Hydraulic control system of a six-speed automatic transmission Hydraulic control system of a six-speed automatic transmission

2005-09-13

2005-09-13

Marmor, Charles A. (Department: 3681)

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

C475S116000, C475S118000, C475S119000, C475S120000, C475S121000, C477S127000, C477S130000, C477S159000

Reexamination Certificate

active

06942591

ABSTRACT:
Each control portion for controlling each friction element includes a switch valve and pressure control valve such that hydraulic pressure supplied to the friction element is fully controlled, and a control portion for controlling a friction element that is operated both at low and high speeds includes a switch valve that senses an operation of a friction member cooperatively with the friction element at the high speed such that the friction member receives different hydraulic pressure at low and high speeds. A plurality of fail-safe valves is included for enhancement of a fail-safe function of an automatic transmission.

REFERENCES:
patent: 6027427 (2000-02-01), Yoo
patent: 6139469 (2000-10-01), Jang
patent: 6394926 (2002-05-01), Jang
patent: 6565474 (2003-05-01), Futamura et al.
patent: 6805649 (2004-10-01), Kim et al.
patent: 2004/0248685 (2004-12-01), Yi
patent: 6971302 (2003-05-01), None
patent: 02042270 (1990-02-01), None
patent: 2003-056683 (2003-02-01), None

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