Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Fluid controlled mechanical clutch or brake
Patent
1993-04-27
1995-01-24
Wright, Dirk
Planetary gear transmission systems or components
Fluid drive or control of planetary gearing
Fluid controlled mechanical clutch or brake
477154, F16H 6108
Patent
active
053838203
ABSTRACT:
A control system for controlling an automotive automatic transmission which comprises a friction element operated by a hydraulic pressure. The control system comprises a first device for judging whether a gear change of the transmission is necessary or not in accordance with the running condition of the vehicle; a second device for lowering the hydraulic pressure when the first device judges a necessity of the gear change; a third device for increasing the hydraulic pressure when a difference between the maximum engine speed appearing after starting of gear change operation and a current engine speed is greater than a predetermined degree; and a fourth device for increasing the hydraulic pressure when a predetermined time passes from the time when the first device has judged the necessity of the gear change irrespective of operation of the third device.
REFERENCES:
patent: 3823621 (1974-07-01), Kubo et al.
patent: 4653350 (1987-03-01), Downs et al.
patent: 4790418 (1988-12-01), Brown et al.
patent: 5207122 (1993-05-01), Minagawa
Jatco Corporation
Wright Dirk
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