Fuel cell system and gas leak detection method

Chemistry: electrical current producing apparatus – product – and – Having magnetic field feature

Reexamination Certificate

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C429S006000, C429S006000

Reexamination Certificate

active

07442452

ABSTRACT:
When a command for stopping electric generation by a fuel cell is issued, shutoff valves are closed (at time t1), and then a time-dependent change in pressure (P) in a closed passage area including the fuel cell is detected. A pressure change speed (dP1, i.e., an inclination of L1) when the pressure (P) is in a first pressure range (Ra) in the vicinity of atmospheric pressure and a pressure change speed (dP2, i.e., an inclination of L2) when the pressure (P) is in a second pressure range (Rb) that is on a high pressure side of the first pressure range (Ra) are detected, and both the pressure change speeds (dP1, dP2) are compared with each other. When a difference between both the pressure change speeds (dP1, dP2) is equal to or larger than a predetermined value (Pc), it is determined that there is a hole in an electrolyte membrane of the fuel cell.

REFERENCES:
patent: 6156447 (2000-12-01), Bette et al.
patent: 6492043 (2002-12-01), Knights et al.
patent: 6851298 (2005-02-01), Miura et al.
patent: 7087334 (2006-08-01), Sugino et al.
patent: 2001/0001287 (2001-05-01), Ueno et al.
patent: 2003/0077495 (2003-04-01), Scartozzi et al.
patent: A 03-250564 (1991-11-01), None

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