CATALYST DETERIORATION DETECTION SENSOR, CATALYST DETERIORATION DETECTION METHOD AND CATALYST REPLACEMENT INFORMING DEVICE

摘要

PROBLEM TO BE SOLVED: To detect deterioration of catalyst by estimating absolute value of degree of deterioration of an exhaust emission control catalyst.

SOLUTION: A catalyst deterioration detection sensor 100 comprises; solid electrolyte 40 having oxygen ion conductivity; a heater 42 heating the solid electrolyte 40; a first electrode part 20 formed on an outer surface of the solid electrolyte 40 and having catalyst 22 having same components as deterioration measured catalyst applied thereon; a second electrode part 30 formed on the outer surface of the solid electrolyte 40 and having no catalyst applied thereon; a reference electrode part 10 formed on an inner surface of the solid electrolyte 40; an electric potential difference detection part 50 detecting electric potential difference V1between the first electrode part 20 and the reference electrode part 10 and electric potential difference V2between the second electrode part 30 and the reference electrode part 10; and a control part 52 detecting degree of deterioration of the catalyst by comparing electric potential difference V1and electric potential difference V2output from the electric potential difference detection part 50.

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