Hydraulic control system for automatic transmissions

Details Hydraulic control system for automatic transmissions Hydraulic control system for automatic transmissions

1998-11-18

1999-11-16

Wright, Dirk

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

475133, F16H 6104

Patent

active

059848189

ABSTRACT:
Disclosed is a hydraulic control system for automatic transmissions. The hydraulic control system includes line pressure control means for controlling hydraulic pressure generated by an oil pump into line pressure suitable for each shift range; converter clutch control means for engaging and disengaging a converter clutch and supplying lubrication oil to a transaxle by controlling hydraulic pressure supplied from the line pressure control means; a manual valve for supplying hydraulic pressure supplied from the line pressure control means to correspond to each shift range; actuators for duty or ON/OFF-controlling hydraulic pressure supplied from the manual valve and the line pressure control means according to control signals of a transmission control unit; switching means for selectively supplying hydraulic pressure to first through ninth friction elements, and for supplying hydraulic pressure controlled in the actuators to selected friction elements when shifting from different shift ranges; and fail-safe means for either supplying or cutting off hydraulic pressure supplied from the switching means.

REFERENCES:
patent: 5655994 (1997-08-01), Jang et al.
patent: 5658220 (1997-08-01), Jang
patent: 5797821 (1998-08-01), Fujimoto et al.
patent: 5813941 (1998-09-01), Jang
patent: 5860886 (1999-01-01), Kim
patent: 5876303 (1999-03-01), Yu
patent: 5888169 (1999-03-01), Jang
patent: 5895334 (1999-04-01), Yu

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