| 摘要 |
An upstream purge valve (16) and a downstream purge valve (17) are provided in series on a hydrogen discharge passage (13) for discharging hydrogen gas from the anode (2a) or the hydrogen circulation passage (11a) of a fuel cell to the outside of the system. Furthermore, a pressure sensor (15) is provided for detecting the pressure of the hydrogen discharge passage (13b) between the upstream purge valve (16) and the downstream purge valve (17). A system control section (18) encloses the hydrogen discharge passage (13b) by closing the upstream purge valve (16) and the downstream purge valve (17) and monitors time variation in detection value of the pressure sensor (15). When the detection value of the pressure sensor (15) lowers toward the atmospheric pressure, the system control section (18) judges open lock failure of the downstream purge valve (17) has occurred and when the detection value lowers toward the pressure of the anode (2a) that it judges that open lock failure of the upstream purge valve (16) has occurred. |
