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Anode reactive bleed and injector shift control strategy

United States Patent

January 3, 2012
View the Complete Patent at the US Patent & Trademark Office
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.
Cai; Jun (Rochester, NY), Chowdhury; Akbar (Pittsford, NY), Lerner; Seth E. (Honeoye Falls, NY), Marley; William S (Rush, NY), Savage; David R (Rochester, NY), Leary; James K (Rochester, NY)
GM Global Technology Operations LLC (Detroit, MI)
12/ 334,040
December 12, 2008
GOVERNMENT CONTRACT The U.S. Government may have a paid-up license in this invention and the right in limited circumstances to require the patent owner to license others on reasonable terms as provided for by the terms of Government Contract/Project awarded by the U.S. Department of Energy.