The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 01, 2011
Filed:
Sep. 13, 2007
Ryan D. Martini, Royal Oak, MI (US);
Charles J. Van Horn, Novi, MI (US);
Peter E. Wu, Brighton, MI (US);
Andrew M. Zettel, Ann Arbor, MI (US);
Thomas E. Mathews, Pendleton, IN (US);
Jy-jen F. Sah, West Bloomfield, MI (US);
Syed Naqi, Ann Arbor, MI (US);
Darren Crewes, West Bloomfield, MI (US);
Ryan D. Martini, Royal Oak, MI (US);
Charles J. Van Horn, Novi, MI (US);
Peter E. Wu, Brighton, MI (US);
Andrew M. Zettel, Ann Arbor, MI (US);
Thomas E. Mathews, Pendleton, IN (US);
Jy-Jen F. Sah, West Bloomfield, MI (US);
Syed Naqi, Ann Arbor, MI (US);
Darren Crewes, West Bloomfield, MI (US);
GM Global Technology Operations LLC, Detroit, MI (US);
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.