Control system for servo hydraulic pressure of two friction enga

Details Control system for servo hydraulic pressure of two friction enga Control system for servo hydraulic pressure of two friction enga

1992-11-27

1994-10-04

Braun, Leslie A.

Interrelated power delivery controls, including engine control

Electric engine

With clutch control

477148, F16H 6104, F16H 6108

Patent

active

053515773

ABSTRACT:
A control system is provided for servo hydraulic pressure in an 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 first and second frictional engagement devices engageable simultaneously in a reverse range, first and second servo pressure feed lines for feeding servo hydraulic pressure to the devices, a regulator valve disposed in the first line, a solenoid for controlling the valve, an electronic control unit for outputting a signal to the solenoid, and a detector for detecting shifting to the reverse range. The valve is controlled by the solenoid in accordance with an output from the unit upon detection of shifting to the reverse range by the detector, whereby engagement of the first device is coincided with that of the second device.

REFERENCES:
patent: 4346626 (1982-08-01), Kawamoto
patent: 5078028 (1992-01-01), Ishikawa et al.
patent: 5088357 (1992-02-01), Kamada et al.
patent: 5113724 (1992-05-01), Hayasaki
patent: 5224399 (1993-07-01), Baba et al.

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