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
2011-06-07
2011-06-07
Ryan, Patrick (Department: 1726)
Chemistry: electrical current producing apparatus, product, and
Fuel cell, subcombination thereof, or method of making or...
Process or means for control of operation
C429S431000, C429S432000
Reexamination Certificate
active
07955743
ABSTRACT:
A system and method for limiting the output current of a fuel cell stack as the stack degrades overtime. A look-up table identifies a predetermined voltage set-point for stack current density. A first comparator provides a voltage difference signal between the set-point and the stack voltage. The voltage difference signal is provided to a controller, such as a proportional-integral controller, that provides a current limiting signal. The current limiting signal and a current request signal are provided to a second comparator that selects which signal will be used to limit the maximum output current of the stack. A polarization curve estimator estimates parameters of the stack that will change over the life of the stack. The parameters are provided to a gain scheduler that provides gains to the controller that are based on where in the life of the stack it is currently operating.
REFERENCES:
patent: 5156928 (1992-10-01), Takabayashi
patent: 7419734 (2008-09-01), Pearson
Arthur David A.
Ganapathy Sriram
Leo Frank X.
Salvador John P.
Savage David R.
GM Global Technology Operations LLC
Mercado Julian
Miller John A.
Miller IP Group, PLC
Ryan Patrick
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