| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a fuel cell system facilitating an exhaust abnormality diagnosis of a fuel gas exhausted from a fuel cell stack 3. <P>SOLUTION: This fuel cell system is provided with: the fuel cell stack 3 supplied with the hydrogen-containing fuel gas and an oxygen-containing oxidizer gas for generating power by electrochemically reacting hydrogen and oxygen with each other; a fuel gas circulation passage 9 for supplying the fuel gas exhausted from the fuel cell stack 3 to the fuel cell stack again; a flow control valve 11 for exhausting the fuel gas in the fuel gas circulation passage 9 to the outside; a fuel gas exhaust passage 10 connected to the downstream of the flow control valve 11; a pressure detection part 19 for detecting pressure in the fuel gas exhaust passage 10; an opening control part 23 for transferring an opening directive value for controlling the switching state of the flow control valve 11 to the flow control valve 11; a pressure estimation part 24 for estimating the pressure in the fuel gas exhaust passage 10 based on the opening directive value; and an abnormality detection part 25 for detecting an exhaust abnormality of the fuel gas based on the pressure detected by the pressure detection part 19 and the pressure estimated by the pressure estimation part 24. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
