System and method for controlling cathode stoichiometry to...

Details System and method for controlling cathode stoichiometry to... System and method for controlling cathode stoichiometry to...

2005-10-07

2009-10-27

Ryan, Patrick (Department: 1795)

Chemistry: electrical current producing apparatus, product, and

Having magnetic field feature

C429S006000, C429S006000

Reexamination Certificate

active

07608351

ABSTRACT:
A system and method for providing dynamic cathode stoichiometry control in a fuel cell during stack load transients to minimize relative humidity excursions. Particularly, changes in the cathode stoichiometry is controlled as a function of time in response to a decrease or increase in stack current density. Thus, if the stack current density drops to a predetermined current density, the dynamic stoichiometry logic will monitor the low power condition and determine if the condition is sustained, i.e., for an extended period of time. If the low power condition is not sustained, then the cathode stoichiometry does not change, but if it is sustained, then the cathode stoichiometry is increased. The same delay in changing the cathode stoichiometry can be provided for a transition from a low power condition to a high power condition.

REFERENCES:
patent: 6697745 (2004-02-01), Jones et al.
patent: 2005/0214602 (2005-09-01), Sinha et al.

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