Fuel cell system

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

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Details

C429S433000

Reexamination Certificate

active

08034498

ABSTRACT:
A fuel cell system according to the present invention is characterized by comprising a fuel cell, measurement means for measuring impedances of the fuel cell in two kinds or more of frequency regions, and first judgment means for judging two or more parameters concerned with an internal state of the fuel cell based on measurement results of the impedances in the respective frequency regions. According to such a constitution, the impedances in the two or more types of frequency regions (a high frequency region, a low frequency region and the like) are measured to judge two or more parameters such as a wet state of an electrolytic film of the fuel cell and a supply state of a fuel gas, which are concerned with the internal state of the fuel cell based on this measurement result. Since such judgment is performed, as compared with the conventional technology, the internal state of the fuel cell can accurately be grasped, and highly efficient and highly robust control of the fuel cell system can be performed.

REFERENCES:
patent: 2004/0151956 (2004-08-01), Orihashi et al.
patent: 2004/0229098 (2004-11-01), Fujita
patent: 2005/0048336 (2005-03-01), Takebe et al.
patent: 2006/0147765 (2006-07-01), Barrett
patent: 1 501 146 (2005-01-01), None
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patent: 2004-509446 (2004-03-01), None
patent: 2004-119139 (2004-04-01), None
patent: 2004-241236 (2004-08-01), None
patent: 2005-108674 (2005-04-01), None
patent: 2005-285614 (2005-10-01), None
patent: WO 03/098769 (2003-11-01), None

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