Hydraulic control system for automatic transmission with energy

Details Hydraulic control system for automatic transmission with energy Hydraulic control system for automatic transmission with energy

1999-03-31

2000-12-12

Bonck, Rodney H.

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

477906, F16H 6130

Patent

active

061591246

ABSTRACT:
A manual valve arrangement is provided for an automatic transmission which provides for uninterrupted friction element control even though manual valve porting is being switched. An extra multi-select solenoid combined with porting through the manual valve and dual acting ball check assemblies permits selected friction elements to be controlled from two solenoids simultaneously. The extra multi-select solenoid, which is a normally-open solenoid valve, permits an energy savings logic mode in which the a normally-closed solenoid valve can be de-energized. Output from the extra multi-select solenoid is switched to different clutch elements when the manual valve is moved from the reverse position to the drive position and from the drive position to the second position.

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