EXHAUST EMISSION CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE

PROBLEM TO BE SOLVED: To perform NOx reduction processing in the proper timing, by accurately estimating the total quantity of NOx trapped in a NOx trap catalyst in response to a change in trap efficiency. SOLUTION: While estimating a NOx quantity trapped in the NOx trap catalyst per unit time on th...

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Hauptverfasser:	ISHINO TAKESHI, YASUHARA KOSUKE
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 OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE TRANSPORTING WEAPONS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To perform NOx reduction processing in the proper timing, by accurately estimating the total quantity of NOx trapped in a NOx trap catalyst in response to a change in trap efficiency. SOLUTION: While estimating a NOx quantity trapped in the NOx trap catalyst per unit time on the basis of a suction air quantity, a correction factor kNOxbed for correcting a NOx trap quantity per unit time is set in response to the catalytic carrier temperature. The correction factor kNOxbed is set in response to a state of reducing the trap efficiency in the NOx trap catalyst 11 in an inactive temperature area and reducing in a high temperature area, to thereby avoid estimating the NOx trap quantity per unit time larger than an actual quantity under a temperature condition of reducing the trap efficiency. COPYRIGHT: (C)2006,JPO&NCIPI