Ozone decomposition removal catalyst deterioration diagnosis apparatus, air purification apparatus including the same, and ozone decomposition removal catalyst deterioration diagnosis method

摘要

PROBLEM TO BE SOLVED: To provide a deterioration diagnostic device capable of diagnosing a deterioration state of an ozone degradation removal catalyst based on an ozone purification ratio.SOLUTION: A deterioration diagnostic device comprises: electrical resistance measurement means of a metal film; catalyst temperature measurement means; catalyst passage wind speed measurement means; and means for, using a standard curve of catalyst temperature and a resistance value in an initial state, considering increase of electrical resistance due to deterioration of the catalyst, correcting a measurement value of the electrical resistance of the metal film to an electrical resistance value of the metal film at reference temperature of the catalyst, calculating an ozone purification ratio Cin a reference condition corresponding to a correction value of the electrical resistance based on a standard curve of the resistance value of the catalyst and ozone purification ratio in the reference condition, correcting the ozone purification ratio Cto an ozone purification ratio Cin an actual travel condition, based on a standard curve of catalyst temperature and ozone purification ratio at reference wind speed, and a standard curve of wind speed of wind passing the catalyst at the reference temperature and ozone purification ratio, and diagnosing deterioration of the catalyst based on an atmospheric air purification credit value calculated by using the ozone purification ratio C.