Method to begin coolant circulation to prevent MEA...

Details Method to begin coolant circulation to prevent MEA... Method to begin coolant circulation to prevent MEA...

2008-07-01

2008-07-01

Ryan, Patrick Joseph (Department: 1795)

Chemistry: electrical current producing apparatus, product, and

Having magnetic field feature

C429S006000, C429S006000

Reexamination Certificate

active

07393602

ABSTRACT:
A system and method for determining the internal temperature of a fuel cell stack during stack start-up so as to start a cooling fluid flow before the internal temperature of the stack rises above a temperature that might damage the fuel cells within the stack. The system and method include determining an initial temperature from either an ambient temperature sensor or a sensor in the cooling fluid manifold in the stack, measuring the voltage of the stack and the current from the stack, and from these values determining the waste heat from the stack to determine its temperature. If hydrogen is sent to the cathode side of the stack during the start-up, then the system and method also include determining the flow rate of the hydrogen.

REFERENCES:
patent: 6479177 (2002-11-01), Roberts et al.
patent: 6777115 (2004-08-01), Reiser
patent: 2004/0033396 (2004-02-01), Thompson et al.
patent: 2004/086546 (2004-10-01), None

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