Exhaust gas purification apparatus for engine

The invention provides an engine exhaust gas purification device which avoids unburned fuels from depositing in the EGR passage in a tar form, comprising a filter provided in an exhaust passage of an engine for trapping particulate matter contained in the exhaust gas; a catalyst for regenerating the...

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Bibliographische Detailangaben
Hauptverfasser:	ONODERA TAKAO, HASEYAMA TAKASHI, IKEDA HIDE, GO TAMOTSU, MATSUNUMA ATSUSHI, MIYAZAKI TOSHIO, IWASHITA TAKURO
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	BLASTING CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TOTRANSPORTATION 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 GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS 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 SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE TRANSPORTING WEAPONS
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Beschreibung
Zusammenfassung:	The invention provides an engine exhaust gas purification device which avoids unburned fuels from depositing in the EGR passage in a tar form, comprising a filter provided in an exhaust passage of an engine for trapping particulate matter contained in the exhaust gas; a catalyst for regenerating the filter by burning the particulate matter trapped in the filter; an EGR valve provided in an EGR passage linking the intake side and exhaust side of the engine; an injector for injecting fuel into a cylinder; and a control unit for controlling the injector and the EGR valve. During regeneration of the filter, the control unit closes the EGR valve when fuel injection from the injector is controlled to supply unburned fuel components to the catalyst, and opens the EGR valve when no fuel is injected from the injector upon a request for speed reduction or the like. In so doing, residual unburned fuel components in the EGR passage are scavenged by air.