Hydraulic control system for automatic transmissions

Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Fluid controlled mechanical clutch or brake

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Details

477116, 477117, 477158, 475120, F16H 6100

Patent

active

058953345

ABSTRACT:
The present invention provides a hydraulic control system for automatic transmissions, which includes line pressure control mechanism for regulating hydraulic pressure generated in an oil pump to a line pressure level, damper clutch control mechanism for receiving the line pressure to control a damper clutch, shift control mechanism for receiving the line pressure and supplying the same according to each shift mode, hydraulic pressure distributing meachanism for receiving hydraulic pressure from the shift control mechanism and supplying the same to a plurality of friction elements, and hydraulic pressure control mechanism for regulating the line pressure and supplying the same to the hydraulic pressure distributing mechanism to correspond to each shift mode wherein abrupt pressure exhaust preventing mechanism is provided which slows exhaust of hydraulic pressure when shifting from drive D or reverse R ranges to a neutral N range.

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patent: 5795262 (1998-08-01), Robinson
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