Exhaust gas purifying apparatus for internal combustion engine

The reduction rich operation is initiated when a count value CNOx that represents the volume of NOx absorbed by a NOx purifying device exceeds a permissible value CNOxREF. At this time, the air-fuel ratio for the first cylinder group is set richer than the theoretical air-fuel ratio, the air-fuel ra...

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Bibliographische Detailangaben
1. Verfasser:	TAKANOHASHI, TOSHIKATSU
Format:	Patent
Sprache:	eng ; fre ; ger
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 MECHANICAL ENGINEERING STEAM ENGINES WEAPONS
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Beschreibung
Zusammenfassung:	The reduction rich operation is initiated when a count value CNOx that represents the volume of NOx absorbed by a NOx purifying device exceeds a permissible value CNOxREF. At this time, the air-fuel ratio for the first cylinder group is set richer than the theoretical air-fuel ratio, the air-fuel ratio for the second cylinder group is set leaner, and the average air-fuel ratio is set richer. The volume of the ammonia generated by three-way catalysts is monitored, and when the NOx removal catalyst has become saturated with ammonia and almost all the NOx that has been absorbed by the NOx purifying device has been reduced, the reduction rich operation is terminated.