Exhaust gas purification device for internal-combustion engine

The purpose of the present invention is to reduce the amount of NOx emitted into the air. In this exhaust gas purification device, the amount of ammonia adsorbed on an SCR catalyst is calculated by subtracting the amount of ammonium nitrate formed on the SCR catalyst from the amount of ammonia adsor...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	KAWAGUCHI BUNGO, ODA TOMIHISA, SHIRASAWA TAKERU
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TOTRANSPORTATION ENGINE PLANTS IN GENERAL GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS HEATING LIGHTING MACHINES OR ENGINES IN GENERAL MECHANICAL ENGINEERING PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SEPARATION STEAM ENGINES TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE TRANSPORTING WEAPONS
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Beschreibung
Zusammenfassung:	The purpose of the present invention is to reduce the amount of NOx emitted into the air. In this exhaust gas purification device, the amount of ammonia adsorbed on an SCR catalyst is calculated by subtracting the amount of ammonium nitrate formed on the SCR catalyst from the amount of ammonia adsorbed on the SCR catalyst at starting an internal-combustion engine. In a case where the NOx purification efficiency estimated from the calculated amount of ammonia adsorbed on the SCR catalyst is lower than a threshold, the amount of NO2 flowing into the SCR catalyst is adjusted to a level lower than that set in a case where the purification efficiency is equal to or higher than the threshold.