Electro-hydraulic control system with multiplexed trim...

Details Electro-hydraulic control system with multiplexed trim... Electro-hydraulic control system with multiplexed trim...

2007-01-26

2010-02-23

Wright, Dirk (Department: 3655)

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

Reexamination Certificate

active

07666112

ABSTRACT:
An electro-hydraulic control system is provided, preferably for a countershaft transmission, that uses logic valves to multiplex trim systems to more than one torque-transmitting mechanism, thereby minimizing the number of required components. Additionally, the electro-hydraulic control system preferably has more than one failure mode so that the transmission operates at a respective predetermined speed ratio in the event of an interruption in electrical power.

REFERENCES:
patent: 6585617 (2003-07-01), Moorman et al.
patent: 7140993 (2006-11-01), Long et al.
patent: 7285066 (2007-10-01), Long et al.
patent: 7288039 (2007-10-01), Foster et al.
patent: 7396306 (2008-07-01), Long et al.
patent: 7510496 (2009-03-01), Long et al.
patent: 2008/0176700 (2008-07-01), Long et al.
patent: 2008/0190228 (2008-08-01), Long et al.
patent: 2009/0075772 (2009-03-01), Ellis et al.

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