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:
Apr. 16, 2013
Filed:
Jul. 14, 2009
Tayoung Choi, Rochester, NY (US);
Sriram Ganapathy, Rochester, NY (US);
Jaehak Jung, Pittsford, NY (US);
David R. Savage, Webster, NY (US);
Balasubramanian Lakshmanan, Pittsford, NY (US);
Pamela M. Vecasey, Honeoye Falls, NY (US);
Tayoung Choi, Rochester, NY (US);
Sriram Ganapathy, Rochester, NY (US);
Jaehak Jung, Pittsford, NY (US);
David R. Savage, Webster, NY (US);
Balasubramanian Lakshmanan, Pittsford, NY (US);
Pamela M. Vecasey, Honeoye Falls, NY (US);
GM GLobal Technology Operations LLC, Detroit, MI (US);
Abstract
A system and method for detecting a low performing cell in a fuel cell stack using measured cell voltages. The method includes determining that the fuel cell stack is running, the stack coolant temperature is above a certain temperature and the stack current density is within a relatively low power range. The method further includes calculating the average cell voltage, and determining whether the difference between the average cell voltage and the minimum cell voltage is greater than a predetermined threshold. If the difference between the average cell voltage and the minimum cell voltage is greater than the predetermined threshold and the minimum cell voltage is less than another predetermined threshold, then the method increments a low performing cell timer. A ratio of the low performing cell timer and a system run timer is calculated to identify a low performing cell.