Hydraulic pressure control system of an automatic transmission f

Details Hydraulic pressure control system of an automatic transmission f Hydraulic pressure control system of an automatic transmission f

1994-12-21

1996-07-16

Wright, Dirk

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

F16H 6104

Patent

active

055362168

ABSTRACT:
The present invention provides a 4-speed transmission control system for a vehicle including a multiple stage gear mechanism receiving a driving force from an engine, a plurality of friction members for controlling a gear action of the gear mechanism, a hydraulic pressure control system for selectively applying and releasing the friction members in accordance with a vehicle speed, and a transmission control unit for controlling an operation of the hydraulic pressure control system, in which the hydraulic pressure control system has a first-to-second speed shift valve actuated in accordance with a second speed signal pressure and selectively applying more than one of the friction members, and a second-to-third speed shift valve actuated in accordance with a third speed signal pressure.

REFERENCES:
patent: 5211082 (1993-05-01), Sasaki et al.
patent: 5301572 (1994-04-01), Tanaka et al.
patent: 5376056 (1994-12-01), Wakahara et al.
patent: 5383820 (1995-01-01), Mori
patent: 5409427 (1995-04-01), Mori et al.

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