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:
Jul. 07, 2009
Filed:
Nov. 21, 2005
Andrew M. Zettel, Ann Arbor, MI (US);
Michael J. Miller, Macomb, MI (US);
James C. Gibbs, Clinton Township, MI (US);
Mary A. Jeffers, Clarkston, MI (US);
Andrew M. Zettel, Ann Arbor, MI (US);
Michael J. Miller, Macomb, MI (US);
James C. Gibbs, Clinton Township, MI (US);
Mary A. Jeffers, Clarkston, MI (US);
GM Global Technology Operations, Inc., Detroit, MI (US);
Abstract
A method and system to monitor a high voltage power relay operable to conduct electrical power from a source to a load, during each vehicle shutdown event. The system includes the electrical relay with a resistive device, electrically connected in parallel circuit, a controllable electrical load device, and a sensing device. A controller is connected to the electrical relay and each sensing device, and operable to identify a low electrical load condition at the load. The controller commands the load to operate at a known current draw level, commands the relay open, and monitors a change in power to the load device when the relay is commanded open. The electrical relay is functioning properly when the change in electrical power to the load exhibits a known profile over time, when the electrical relay is controlled to the commanded-open position.