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:
May. 21, 2002
Filed:
Sep. 15, 2000
Sayeed A. Mir, Saginaw, MI (US);
Dennis B. Skellenger, Vassar, MI (US);
Roy Alan Mc Cann, Saginaw, MI (US);
Mark Philip Colosky, Vassar, MI (US);
Delphi Technologies, Inc., Troy, MI (US);
Abstract
A method and system for diagnostics and ascertaining status of an electric machine coupled to a polyphase bus. The method and system include: detecting a rotational position with a position encoder coupled to the electric machine; controlling an inverter having an input coupled to a direct current bus and an output coupled to the polyphase bus, where the inverter is responsive to commands from a controller coupled to the inverter and to the position encoder. The method and system further include measuring a current from the direct current bus; capturing a torque current; calculating a current error; establishing a bound limit for the torque current; comparing the current error to the bound limit. The method and system also include: determining whether a fault exists by evaluating if the bound limit has been exceeded; incrementing a fault counter if a fault exists; decrementing a fault counter if no fault exists; and indicating a failure if the fault counter exceeds a predetermined limit.