Multiple pressure-to-current relations in a system having a sole

Details Multiple pressure-to-current relations in a system having a sole Multiple pressure-to-current relations in a system having a sole

1994-10-03

1996-11-26

Pitts, Andrea L.

192 clutches and power-stop control

Clutches

Operators

192 8713, 192 8718, 192104F, 192109F, F16D 2500, F16D 2510

Patent

active

055775845

ABSTRACT:
A regulator valve (14) includes a valve spool (30) biased in a valve chamber (32) by control pressure whose magnitude is determined by operation of a variable force solenoid (42), first and second control areas (28, 26) exposed to friction element pressure. A shift valve (16) includes a spool having multiple control lands (66, 68), the position of spool determined by the state of an on/off solenoid (70). The shift valve produces high and low hydraulic pressure operative to open and close line pressure or a vent to a hydraulically-activated clutch.

REFERENCES:
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patent: 3625322 (1971-12-01), Nagamatsu et al.
patent: 3674121 (1972-07-01), Copeland
patent: 3799308 (1974-03-01), Erisman
patent: 4066006 (1978-01-01), Heiser
patent: 4073203 (1978-02-01), Wurst et al.
patent: 4094211 (1978-06-01), Espenschied
patent: 4478237 (1984-10-01), Blake et al.
patent: 4577143 (1986-03-01), Eschrich et al.
patent: 4676349 (1987-06-01), Coutant
patent: 4883092 (1989-11-01), Rub
patent: 5115722 (1992-05-01), Ichihashi et al.

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