Planetary gear transmission systems or components – Input from independent power sources – Including electric motor input
Reexamination Certificate
2011-02-01
2011-02-01
Wright, Dirk (Department: 3655)
Planetary gear transmission systems or components
Input from independent power sources
Including electric motor input
Reexamination Certificate
active
07878932
ABSTRACT:
Monitoring operation of an electro-mechanical transmission having a hydraulic circuit with flow management valves and pressure control solenoids to actuate clutches and pressure monitoring devices to monitor the hydraulic circuit is provided. The transmission operates in fixed gear and continuously variable operating range states. The method comprises controlling position of one of the flow management valves to control operation in one of the operating range states. A fault is detected in the one of the flow management valves based upon outputs of the pressure monitoring devices during steady state operation in one of the continuously variable operating range states. A fault is detected in the one of the flow management valves based upon the output of one of the pressure monitoring devices during a transition in the flow management valve.
REFERENCES:
patent: 6953409 (2005-10-01), Schmidt et al.
patent: 2007/0099739 (2007-05-01), Foster et al.
patent: 2009/0082150 (2009-03-01), Wu et al.
patent: 2009/0099742 (2009-04-01), Wu et al.
Crewes Darren
Martini Ryan D.
Mathews Thomas E.
Naqi Syed
Sah Jy-Jen F.
GM Global Technology Operations LLC
Wright Dirk
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