| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a fuel cell system capable of estimating fuel gas concentration and/or impurity gas concentration by a simple structure. <P>SOLUTION: The fuel cell system is provided with an anode passage 76 in which fuel that has passed the fuel cell stack 20 is circulated again in the fuel cell stack. Based on pressure loss in the anode passage, the fuel gas concentration or the impurity gas concentration is led out. Since the pressure loss can be measured by a differential pressure gage 58 or a pressure gage arranged in the piping, a special measuring equipment is not needed and the gas concentration can be estimated with a simple structure. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
