| abstract |
PROBLEM TO BE SOLVED: To provide a technique capable of detecting a failure of a limiting current type gas sensor regardless of the concentration of a predetermined component contained in a gas to be detected. The present invention relates to a solid electrolyte having oxide ion conductivity, a pair of electrodes attached to the solid electrolyte, and a diffusion rate-controlling part for diffusion-controlling a gas to be detected to one of the pair of electrodes. A failure detection device, comprising a sensor element including: and applied to a limiting current type gas sensor for detecting the concentration of a predetermined component contained in a gas to be detected. The failure detection device includes an energizing means for applying a predetermined voltage, which is a positive voltage and a voltage on the lower voltage side of the limit current region when the gas sensor is not broken, and a predetermined voltage. When being applied between the pair of electrodes, an acquisition unit that acquires a determination current that is a current flowing between the pair of electrodes, and a determination unit that determines a failure of the gas sensor based on the determination current, Equipped with. [Selection diagram] Fig. 9 |