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:
Dec. 22, 2006
Zhenxing Fu, Ann Arbor, MI (US);
Marcus Heller, Farmington Hills, MI (US);
Zhenxing Fu, Ann Arbor, MI (US);
Marcus Heller, Farmington Hills, MI (US);
Chrysler LLC, Auburn Hills, MI (US);
GM Global Technology Operations, Detroit, MI (US);
Daimler AG, Stuttgart, DE;
Bayerische Motoren Werke Aktiengesellschaft, Munich, DE;
Abstract
A method for testing electric motor shut-off including injecting current into an electric motor, applying at least one of a short or an open to the electric motor for a predetermined length of time, calculating the rate of decay of the current and comparing rate of the decay with a predetermined decay criteria. In one implementation, a predefined sequence of opening and short circuiting the electric motor is used, and the shut-off path tests for the motor three phases can be verified with one test.