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Pattern recognition monitoring of PEM fuel cell

United States Patent

5,945,229
August 31, 1999
View the Complete Patent at the US Patent & Trademark Office
The CO-concentration in the H.sub.2 feed stream to a PEM fuel cell stack is monitored by measuring current and voltage behavior patterns from an auxiliary cell attached to the end of the stack. The auxiliary cell is connected to the same oxygen and hydrogen feed manifolds that supply the stack, and discharges through a constant load. Pattern recognition software compares the current and voltage patterns from the auxiliary cell to current and voltage signature determined from a reference cell similar to the auxiliary cell and operated under controlled conditions over a wide range of CO-concentrations in the H.sub.2 fuel stream.
Meltser; Mark Alexander (Pittsford, NY)
General Motors Corporation (Detroit, MI)
08/ 807,559
February 28, 1997
The Government of the United States of American has rights in this invention pursuant to Contract No. DE-AC02-90CH10435 awarded by the United States Department of Energy.