Control of nitrogen fraction in a flow shifting fuel cell...

Details Control of nitrogen fraction in a flow shifting fuel cell... Control of nitrogen fraction in a flow shifting fuel cell...

2011-01-04

2011-01-04

Michener, Jennifer K (Department: 1795)

Chemistry: electrical current producing apparatus, product, and

Fuel cell, subcombination thereof, or method of making or...

Process or means for control of operation

C429S415000, C429S430000, C429S444000, C429S507000

Reexamination Certificate

active

07862948

ABSTRACT:
A device and method to predict and regulate nitrogen concentration in a flow shifting system. In one aspect of the system, a bleed valve fluidly coupled to multiple fuel cell stacks is used to reduce the presence of nitrogen in an anode flowpath. One or more sensors can be used to measure voltage within one or both of the fuel cell stacks. By assessing fuel cell voltage changes within the anode flowpath and equating such changes with nitrogen fraction buildup, the system can manipulate the bleed valve at appropriate times to improve system operability. In one form of equating the sensed voltage changes with the nitrogen fraction buildup, a predictive algorithm can be used by a logic device in a controller to compare the sensed voltage so that the controller instructs the bleed valve when to open and close. In a variation, the controller can compare the sensed voltages against stored data rather than rely on a formula or related algorithm.

REFERENCES:
patent: 5763113 (1998-06-01), Meltser et al.
patent: 6979506 (2005-12-01), Ballantine et al.
patent: 2004/0131899 (2004-07-01), Cargnelli et al.

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