Pressure control system for a transmission

Details Pressure control system for a transmission Pressure control system for a transmission

1981-11-25

1984-08-14

Krizmanich, George H.

192 clutches and power-stop control

Transmission control and clutch control

Common control

192 8719, 192109F, F16D 2510, B60K 4100

Patent

active

044651686

ABSTRACT:
A pressure control system for a transmission having a series of fluid-operated clutches which are engaged and disengaged through a selector valve to change drive ratios, has a valve for modulating the fluid pressures applied to the clutches to effect smooth shock free shifting. Basic control of the pressure at any of the clutches is effected by a modulation valve upstream of the selector valve. The modulation valve has an auxiliary chamber formed at one end thereof, a piston mounted therein and an auxiliary port connected to one of the clutches having a maximum filling time thereby shortening the filling time thereof without changing filling times of other clutches.

REFERENCES:
patent: 3181394 (1965-05-01), Ramsel et al.
patent: 3618424 (1971-11-01), Golan et al.
patent: 3709065 (1973-01-01), Starling
patent: 3722646 (1973-03-01), Oguma
patent: 3991865 (1976-11-01), Komatsu
patent: 4132302 (1979-01-01), Chatterjea
patent: 4219109 (1980-08-01), Ushijima et al.
patent: 4274521 (1981-06-01), Cadeddu
patent: 4289221 (1981-09-01), Chambers et al.

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