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:
Jan. 03, 2012
Filed:
Dec. 12, 2008
Jun Cai, Rochester, NY (US);
Akbar Chowdhury, Pittsford, NY (US);
Seth E. Lerner, Honeoye Falls, NY (US);
William S Marley, Rush, NY (US);
David R Savage, Rochester, NY (US);
James K Leary, Rochester, NY (US);
Jun Cai, Rochester, NY (US);
Akbar Chowdhury, Pittsford, NY (US);
Seth E. Lerner, Honeoye Falls, NY (US);
William S Marley, Rush, NY (US);
David R Savage, Rochester, NY (US);
James K Leary, Rochester, NY (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
A system and method for correcting a large fuel cell voltage spread for a split sub-stack fuel cell system. The system includes a hydrogen source that provides hydrogen to each split sub-stack and bleed valves for bleeding the anode side of the sub-stacks. The system also includes a voltage measuring device for measuring the voltage of each cell in the split sub-stacks. The system provides two levels for correcting a large stack voltage spread problem. The first level includes sending fresh hydrogen to the weak sub-stack well before a normal reactive bleed would occur, and the second level includes sending fresh hydrogen to the weak sub-stack and opening the bleed valve of the other sub-stack when the cell voltage spread is close to stack failure.