Fuel-cell system and method of estimating nitrogen...

Details Fuel-cell system and method of estimating nitrogen... Fuel-cell system and method of estimating nitrogen...

2006-07-27

2010-06-15

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

C429S428000

Reexamination Certificate

active

07736814

ABSTRACT:
Nitrogen concentration in a fuel-cell stack is estimated more accurately, hence the life of the fuel-cell is prevented from being reduced by operation performed when the impurity concentration in the anode increases. The fuel-cell system comprises: stack temperature detection means for detecting the temperature of the fuel-cell stack; fuel electrode pressure detection means for detecting the pressure of the fuel electrode; and standing time measuring means for measuring the standing time. The fuel electrode nitrogen concentration, which indicates concentration of nitrogen in the fuel electrode of the fuel cell (nitrogen or the like transmitted from the air electrode to the fuel electrode via an electrolyte membrane), is estimated on the basis of the temperature of the fuel-cell stack at the time when operation of the fuel cell is stopped, the pressure in the fuel electrode at the time when the operation of the fuel cell is restarted, and the standing time between when the operation of the fuel cell is stopped and when the operation of the fuel cell is restarted.

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