Hydraulic control system of 8-speed automatic transmission...

Details Hydraulic control system of 8-speed automatic transmission... Hydraulic control system of 8-speed automatic transmission...

2011-07-26

2011-07-26

Estremsky, Sherry (Department: 3655)

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

C475S123000

Reexamination Certificate

active

07985153

ABSTRACT:
A hydraulic control system of an eight-speed automatic transmission includes a first clutch/second clutch control portion controlled by a first proportional control solenoid valve and selectively supplying hydraulic pressure of a first pressure control valve to the first clutch or the second clutch; a third clutch control portion controlled by a second proportional control solenoid valve and supplying hydraulic pressure of a second pressure control valve to the third clutch; a fourth clutch/first brake control portion controlled by a third proportional control solenoid valve and selectively supplying hydraulic pressure of a third pressure control valve to the fourth clutch or the first brake, the fourth clutch/first brake control portion supplying reverse range pressure to the first brake at the reverse speed; and a second brake control portion controlled by a fourth proportional control solenoid valve and directly supplying hydraulic pressure of a fourth pressure control valve to the second brake.

REFERENCES:
patent: 6394926 (2002-05-01), Jang
patent: 6478707 (2002-11-01), Jang
patent: 6656075 (2003-12-01), Park et al.
patent: 7314423 (2008-01-01), Park
patent: 7344466 (2008-03-01), Park

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