EXHAUST EMISSION CONTROL DEVICE FOR CYLINDER INJECTION TYPE ENGINE WITH TURBO SUPERCHARGER

PROBLEM TO BE SOLVED: To raise temperature of a NOx trap catalyst early when emitting NOx. SOLUTION: NOx trap quantity is estimated and when the estimated NOx trap quantity reaches the predetermined NOx threshold value (step 93), the fuel is additionally injected to make an air-fuel ratio rich in an...

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Bibliographische Detailangaben
Hauptverfasser:	FUJII MOTOKIMI, TAGA JUNICHI
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TOTRANSPORTATION COMBUSTION ENGINES COMBUSTION ENGINES IN GENERAL 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 INTERNAL-COMBUSTION PISTON ENGINES 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:	PROBLEM TO BE SOLVED: To raise temperature of a NOx trap catalyst early when emitting NOx. SOLUTION: NOx trap quantity is estimated and when the estimated NOx trap quantity reaches the predetermined NOx threshold value (step 93), the fuel is additionally injected to make an air-fuel ratio rich in an expansion stroke of the operation in a stratified combustion range when temperature of the NOx trap catalyst is at the predetermined temperature of less (step S99, S101). Even if the catalyst temperature is low after setting the rich air-fuel ratio, operation is changed to the operation in an even combustion range to reduce the air quantity and set a rich air-fuel ratio (step S103).