| 摘要 |
<P>PROBLEM TO BE SOLVED: To detect early abnormality occurrence when an abnormality such as oxygen (air) inflow into a hydrogen line in a fuel cell power generation system occurs. <P>SOLUTION: A hydrogen sensor 60 to be used for detecting the hydrogen concentration in the hydrogen line is equipped with a sensor element 61 to be heated by a heater and an explosion-proof body 63 for covering the sensor element 61. A heater voltage and a heater current are measured from a heater circuit 65b for controlling energization of the heater, and a resistance value of the heater is acquired from the heater voltage and the heater current, and the internal temperature of the sensor element 61 is estimated from the resistance value. When the internal temperature exceeds a prescribed temperature, it is determined by an abnormality detection means 68 that the abnormality of oxygen (air) inflow into the hydrogen line occurs to thereby generate combustion caused by the high-temperature sensor element 61 working as an ignition source. <P>COPYRIGHT: (C)2004,JPO |
