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:
Jun. 09, 2009
Filed:
Sep. 13, 2006
Andrew M. Zettel, Ann Arbor, MI (US);
Peter E. Wu, Brighton, MI (US);
Rick H. Schroeder, Lapeer, MI (US);
Michael J. Taljonick, Davison, MI (US);
Andrew M. Zettel, Ann Arbor, MI (US);
Peter E. Wu, Brighton, MI (US);
Rick H. Schroeder, Lapeer, MI (US);
Michael J. Taljonick, Davison, MI (US);
GM Global Technology Operations, Inc., Detroit, MI (US);
Abstract
A method and apparatus to monitor operation of an electrically-actuated hydraulic pump selectively operative to supply pressurized fluid to a hydraulic circuit for a transmission device operably connected to an internal combustion engine of a vehicle includes monitoring vehicle operation and passively and intrusively monitoring hydraulic circuit pressure. The hydraulic pump is functioning properly when the monitored pressure in the hydraulic circuit exceeds a threshold. A fault related to the hydraulic circuit is identified when the monitored pressure in the hydraulic circuit does not exceed the threshold.