Method and apparatus to control operation of a hydraulic...

Details Method and apparatus to control operation of a hydraulic... Method and apparatus to control operation of a hydraulic...

2006-08-04

2009-08-04

Le, David D. (Department: 3655)

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

C475S005000, C475S125000, C475S128000, C180S065230

Reexamination Certificate

active

07568990

ABSTRACT:
There is provided a control system for electro-mechanical transmission that is selectively operative in a plurality of fixed gear modes and continuously variable modes comprising first and second electrical machines and four hydraulically-actuated clutches in fluid communication with a hydraulic circuit comprising first, second and third pressure control devices and first and second flow management valves. The control system is operative to selectively actuate the pressure control devices and the flow management valves based upon a demand for torque, presence of a fault, and temperatures of the electric machines.

REFERENCES:
patent: 6026921 (2000-02-01), Aoyama et al.
patent: 6692402 (2004-02-01), Nakamori et al.
patent: 6709362 (2004-03-01), Tomohiro et al.
patent: 2005/0080527 (2005-04-01), Tao et al.

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