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CATALYST DETERIORATION DIAGNOSIS METHOD, METHOD FOR PURIFICATION OF EXHAUST GAS USING THE DIAGNOSIS METHOD, CATALYST DETERIORATION DIAGNOSIS APPARATUS, AND APPARATUS FOR PURIFICATION OF EXHAUST GAS USING THE DIAGNOSIS APPARATUS
CATALYST DETERIORATION DIAGNOSIS METHOD, METHOD FOR PURIFICATION OF EXHAUST GAS USING THE DIAGNOSIS METHOD, CATALYST DETERIORATION DIAGNOSIS APPARATUS, AND APPARATUS FOR PURIFICATION OF EXHAUST GAS USING THE DIAGNOSIS APPARATUS
A catalyst deterioration diagnosis method for diagnosing deterioration of a catalyst for purification of exhaust gas by using a test catalyst disposed in an exhaust gas flow path through which the exhaust gas flows, the method including an exhaust gas control step of inverting an air-fuel ratio of the exhaust gas in the flow path from a lean side to a rich side or from a rich side to a lean side; a measurement step of measuring a change over time in electrical resistance of the test catalyst at the inversion of the air-fuel ratio and finding a resistance change ratio of the test catalyst; and a determination step of determining catalytic deterioration of the test catalyst based on the resistance change ratio.
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