| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent deterioration and dew condensation in a hydrogen sensor 8 when hydrogen in a cathode offgas discharged from a fuel cell 1 via an exhaust pipe 4 is detected. <P>SOLUTION: A fuel cell ventilation outlet pipe 7, through which gas fed into a fuel cell case 5 housing the fuel for ventilation of the fuel cell 1 flows, is converged into the exhaust pipe 4. A hydrogen sensor 8 is arranged in the fuel cell ventilation outlet pipe 7, and a switch valve 9 is arranged on the upstream side. In detection of hydrogen concentration of gas flowing through the exhaust pipe 4, the switch valve 9 is closed. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
