Selective bypass of solenoid-controlled supply to friction...

Details Selective bypass of solenoid-controlled supply to friction... Selective bypass of solenoid-controlled supply to friction...

2006-05-23

2006-05-23

Bonck, Rodney H. (Department: 3681)

192 clutches and power-stop control

Transmission control and clutch control

Interrelated

C192S051000, C192S083000

Reexamination Certificate

active

07048104

ABSTRACT:
A hydraulic system for controlling the engagement and disengagement of a friction element includes a source of line pressure, a source of exhaust pressure, a manual valve having a forward state and a reverse state, connected to the exhaust pressure source and line pressure source and including a first outlet and a second outlet, for opening and closing communication between said outlets and said pressure sources in response to changes in the states, a friction element communicating with the line pressure source through the manual valve in the reverse state, and a control valve including a port communicating with the friction element, the control valve producing control pressure at the port when the manual valve is in the forward state.

REFERENCES:
patent: 4351206 (1982-09-01), Lemieux et al.
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patent: 5046592 (1991-09-01), Mainquist et al.
patent: 5577584 (1996-11-01), Ortmann
patent: 5674150 (1997-10-01), Morishita et al.
patent: 6007445 (1999-12-01), Kirchhoffer et al.
patent: 2002/0086758 (2002-07-01), Park et al.
patent: 2004/0067810 (2004-04-01), Fujimine et al.

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