Multiplexed trim valve system for an electrically variable...

Details Multiplexed trim valve system for an electrically variable... Multiplexed trim valve system for an electrically variable...

2007-10-23

2007-10-23

Ho, Ha D. (Department: 3681)

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

C475S122000, C475S127000, C475S134000

Reexamination Certificate

active

11218048

ABSTRACT:
A powertrain has an electrically variable hybrid transmission having an electro-hydraulic control system, plurality of electrical power units, and a plurality of torque transmitting mechanisms selectively engageable by the electro-hydraulic control system to provide four forward speed ranges, a neutral condition, an electric low speed mode, an electrically variable low and high speed mode, and two electrical power off drive home modes. The electro-hydraulic control system of the present invention has a multiplexed trim system for an electrically variable hybrid transmission. The multiplexed trim system allows engagement control of four torque transmitting mechanism and individual control of fluid flow to effect cooling of two motor/generators by multiplexing three trim valves with two logic valves.

REFERENCES:
patent: 4070927 (1978-01-01), Polak
patent: 5601506 (1997-02-01), Long et al.
patent: 5911244 (1999-06-01), Long et al.
patent: 6551208 (2003-04-01), Holmes et al.
patent: 6585617 (2003-07-01), Moorman et al.
patent: 6910493 (2005-06-01), Foster et al.
patent: 7140993 (2006-11-01), Long et al.

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