Metal working – Method of mechanical manufacture – Assembling or joining
Reexamination Certificate
2010-10-21
2011-11-08
Michener, Jennifer (Department: 1728)
Metal working
Method of mechanical manufacture
Assembling or joining
C429S433000, C429S428000, C429S434000, C429S437000
Reexamination Certificate
active
08051546
ABSTRACT:
A method for determining whether a fuel cell stack is overheating. The method measures the temperature of end cells in the stack using end cell temperature sensors, and calculates an average end cell temperature based on the end cell temperature measurements. The method also measures the temperature of a cooling fluid being output from the fuel cell stack. The method determines if any of the measured end cell temperatures are outlying by comparing each end cell temperature measurement to the average. The method determines that the cooling fluid outlet temperature sensor has possibly failed if the cooling fluid outlet temperature is greater than the average end cell temperature and the cooling fluid outlet temperature minus the average end cell temperature is greater than a predetermined temperature value.
REFERENCES:
patent: 2003/0180590 (2003-09-01), Hase et al.
patent: 2005/0287406 (2005-12-01), Takahashi
patent: 2007/0122669 (2007-05-01), Kusano et al.
patent: 2007/0298297 (2007-12-01), Arthur et al.
patent: WO 2005034272 (2005-04-01), None
Alp Abdullah B.
Arthur David A.
Chan Heng
GM Global Technology Operations LLC
Michener Jennifer
Miller John A.
Miller IP Group, PLC
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