DEGRADATION DETECTING DEVICE FOR CATALYST

PROBLEM TO BE SOLVED: To prevent misjudgement in detecting the degradation of a catalyst. SOLUTION: In a device for detecting the degradation of a catalyst by comparing the integrated value of output values of an O2 sensor on the upstream in a degradation judging area to the integrated value of outp...

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Hauptverfasser:	YASHIKI SEIJI, HOSOGAI TETSUSHI, NISHIOKA FUTOSHI
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING COMBUSTION ENGINES CONTROLLING COMBUSTION ENGINES ENGINE PLANTS IN GENERAL GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL HEATING HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS LIGHTING MACHINES OR ENGINES IN GENERAL MEASURING MECHANICAL ENGINEERING PHYSICS STEAM ENGINES TESTING TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR WEAPONS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To prevent misjudgement in detecting the degradation of a catalyst. SOLUTION: In a device for detecting the degradation of a catalyst by comparing the integrated value of output values of an O2 sensor on the upstream in a degradation judging area to the integrated value of output values of an O2 sensor on the downstream while feedback-controlling the air fuel ratio after the engine is started, the change in activity of the catalyst is judged before the integration of output values of the respective O2 sensors is started. When the activity of the catalyst is about the same as that at the last time, the integration of output values of the respective O2 sensors is started from the previously integrated value. Further, when the activity of the catalyst is different from the activity at the last time, the previously integrated value is reset, and the integration of output values of each O2 sensor starts from the beginning.