Multiplexed control system and method for an electrically...

Details Multiplexed control system and method for an electrically... Multiplexed control system and method for an electrically...

2005-11-21

2008-07-08

Estremsky, Sherry (Department: 3681)

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

C475S138000

Reexamination Certificate

active

07396306

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 and high speed mode, and an electrically variable low and high speed mode. Additionally, the electrically variable hybrid transmission provides a parallel reverse mode and a series reverse mode. The present invention provides an improved electro-hydraulic control system having a multiplexed electronic transmission range selection (ETRS) and reverse dog clutch system for an electrically variable hybrid transmission. The multiplexed control system of the present invention allows effective control of both the ETRS system and reverse dog clutch system using only one solenoid valve.

REFERENCES:
patent: 4070927 (1978-01-01), Polak
patent: 5601506 (1997-02-01), Long et al.
patent: 5911244 (1999-06-01), Long et al.
patent: 6494801 (2002-12-01), Ohtake et al.
patent: 6551208 (2003-04-01), Holmes et al.
patent: 2002/0084149 (2002-07-01), Heuver
patent: 2003/0190995 (2003-10-01), Aoki

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