Hydraulic control system of eight-speed automatic...

Details Hydraulic control system of eight-speed automatic... Hydraulic control system of eight-speed automatic...

2007-12-17

2010-12-07

Le, David D (Department: 3655)

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

Reexamination Certificate

active

07846053

ABSTRACT:
A hydraulic control system of an eight-speed automatic transmission for a vehicle. Four clutches and two brakes can by independently controlled by six proportional control solenoid valves by employing pressure control valves and pressure switching valves.

REFERENCES:
patent: 6027427 (2000-02-01), Yoo
patent: 6394926 (2002-05-01), Jang
patent: 6537180 (2003-03-01), Kim et al.
patent: 2008/0318723 (2008-12-01), Kang et al.
patent: 2009/0111646 (2009-04-01), Hong
patent: 10-2009-0043072 (2009-05-01), None

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