GAS SENSOR, AND FUEL CELL SYSTEM AND CAR USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a gas sensor for detecting the amount of hydrogen without being affected by the influence of vapor under environment where hydrogen and the vapor coexist.

SOLUTION: The gas sensor comprises a first reference element 2a where a first thermistor 7a is sealed into a first nonporous case 11b with dry air; a first detection element 1a where the second thermistor 7a is put into a first perforated case 11a; a second reference element 2b where the third thermistor 7b that has nearly the same temperature - resistance characteristics and different moisture absorption characteristics as compared with the first thermistor 7a is sealed into the second nonporous case 11b nearly in the same shape as the first nonporous case 11b; and a second detection element 1b where the fourth thermistor 7b is put into a perforated case 11a nearly in the same shape as the first perforated case 11a. A first bridge circuit comprises the first reference element 2a and the first detection element 1a, a second bridge circuit comprises the second reference element 2b and the second detection element 1b, and hydrogen concentration is obtained from the differential output of the bridge circuits.

COPYRIGHT: (C)2004,JPO