Chemistry: electrical current producing apparatus – product – and – Fuel cell – subcombination thereof – or method of making or... – Process or means for control of operation
Reexamination Certificate
2011-08-09
2011-08-09
Alejandro, Raymond (Department: 1727)
Chemistry: electrical current producing apparatus, product, and
Fuel cell, subcombination thereof, or method of making or...
Process or means for control of operation
C429S430000, C429S432000, C429S444000
Reexamination Certificate
active
07993787
ABSTRACT:
A method for providing a fast and reliable start-up of a fuel cell system. The method uses a stack voltage response to a load to assess if hydrogen and oxygen are being sufficiently distributed to all of the fuel cells by coupling an auxiliary load to the fuel cell stack until a predetermined minimum cell voltage has been reached or a first predetermined time period has elapsed. The method then determines whether a minimum cell voltage has dropped to a first predetermined voltage and, if so, reduces the maximum power allowed to be below the first predetermined voltage value, determines whether the minimum cell voltage in the stack is below a second predetermined voltage, or determines whether the minimum cell voltage drop rate is greater than a predetermined voltage drop rate. If none of these conditions are met, the method returns to loading the stack with system components.
REFERENCES:
patent: 7011902 (2006-03-01), Pearson
patent: 2002/0014802 (2002-02-01), Cratty
patent: 2002/0122963 (2002-09-01), Buchner et al.
Alp Abdullah B.
Arthur David A.
Lakshmanan Balasubramanian
Lerner Seth E
Salvador John P.
Alejandro Raymond
GM Global Technology Operations LLC
Miller John A.
Miller IP Group, PLC
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