GAS SENSOR AND FUEL CELL SYSTEM AND AUTOMOBILE EMPLOYING THE SAME

摘要

A gas sensor in which a heating element is continuously fed with a current of three stages or more stepwise for a specified time. An operating section acquires the voltage across the heating element for each current level after elapse of the specified time and determines the temperature from the voltage across the heating element for a lowest current. Furthermore, the voltage across the heating element is corrected according to a correction formula of temperature and zero point and a correction formula of sensitivity, thereby determining a normalized output. Humidity is determined from the difference of normalized outputs and the normalized output is corrected using that humidity and a humidity correction formula. The operating section thus determines concentration of gas to be detected.