COMBUSTIBLE GAS SENSOR, FUEL CELL SYSTEM EQUIPPED WITH GAS SENSOR, ABNORMALITY DETECTION METHOD OF COMBUSTIBLE GAS SENSOR, AND CONTROL METHOD OF FUEL CELL SYSTEM USING ABNORMALITY DETECTION METHOD

摘要

PPROBLEM TO BE SOLVED: To provide a combustible gas sensor or the like capable of stopping a system surely and quickly by determining which of a disconnection and a short circuit causes an abnormality in a short time without requiring a constant-current power source, and miniaturizing the system. PSOLUTION: In this combustible gas sensor, a detection circuit has a constitution wherein a bridge is formed of a compensator for compensating a change of an external environment and a detector for detecting the concentration of combustible gas, and the detection circuit has also a constitution having a means for measuring a current flowing in the detection circuit. Then, the means for measuring the current flowing in the detection circuit can be constituted of a fixed resistance inserted in series into the bridge and a means for measuring voltages of both ends of the fixed resistance. PCOPYRIGHT: (C)2009,JPO&INPIT