EXHAUST PURIFICATION SYSTEM OF INTERNAL COMBUSTION ENGINE

An object of the present invention is to increase the NO X purification rate of an unactivated SCR catalyst in an exhaust emission control system for an internal combustion engine that has an oxidation catalyst and the SCR catalyst disposed downstream of the oxidation catalyst. In order to achieve t...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser:	KOBAYAKAWA, SATOSHI
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 PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SEPARATION STEAM ENGINES TRANSPORTING WEAPONS
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Beschreibung
Zusammenfassung:	An object of the present invention is to increase the NO X purification rate of an unactivated SCR catalyst in an exhaust emission control system for an internal combustion engine that has an oxidation catalyst and the SCR catalyst disposed downstream of the oxidation catalyst. In order to achieve this object, the present invention provides an exhaust emission control system for an internal combustion engine, including an oxidation catalyst disposed in an exhaust passage of the internal combustion engine, an SCR catalyst that is disposed downstream of the oxidation catalyst in the exhaust passage, and a supply device for supplying unburnt fuel to the oxidation catalyst when the SCR catalyst is not yet activated, wherein the amount of NO 2 that flows into the SCR catalyst is increased by reducing the amount of unburnt fuel supplied, when a low-load operation of the internal combustion engine is performed.