| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel cell system capable of calibrating a zero point of a CO sensor without causing deterioration of a fuel cell and aggravation of system efficiency.SOLUTION: A fuel cell system comprises: a fuel cell 24 for generating power using fuel and an oxidant gas; a first combustion unit 26 for making an anode off-gas lead out from the fuel cell 24 combust; a CO sensor 45a for detecting a carbon monoxide concentration D of an exhaust gas discharged from the first combustion unit 26; and a control device 60 for at least controlling power generation of the fuel cell 24. The control device 60 performs second calibration of a zero point of the CO sensor 45a, in the case that a reduction amount (variation) of an output value V of the CO sensor 45a continues being equal to or larger than a predetermined value S for first predetermined time T1 during the power generation of the fuel cell 24. |
