Control system for servo hydraulic pressure in vehicular automat

Details Control system for servo hydraulic pressure in vehicular automat Control system for servo hydraulic pressure in vehicular automat

1992-11-24

1994-08-02

Wright, Dirk

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

475133, 475120, F16H 344

Patent

active

053341147

ABSTRACT:
A control system is provided for servo hydraulic pressure in a vehicular automatic transmission having planetary gear mechanisms. Shifting elements of the mechanisms can be connected to establish a different power flow in accordance with engagement or release of frictional engagement devices under the control of servo hydraulic pressure to achieve plural speed stages. The system comprises a servo pressure feed line for feeding, even in a non-running range, servo hydraulic pressure to at least one particular device out of plural frictional engagement devices which are caused to simultaneously engage in a reverse range of the transmission, a directional control valve disposed in the line to control feed or drain of the servo hydraulic pressure to or from said particular device through the line, and a solenoid valve for controlling the control valve to prevent the feed of the servo hydraulic pressure at vehicle speeds above a predetermined value.

REFERENCES:
patent: 3433098 (1969-03-01), Schaefer
patent: 3448640 (1969-06-01), Nelson
patent: 3709064 (1973-01-01), Schaefer et al.
patent: 3741036 (1973-06-01), Brown
patent: 3789698 (1974-02-01), Williams
patent: 5005444 (1991-04-01), Kimura et al.

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