EXHAUST EMISSION CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE

PROBLEM TO BE SOLVED: To provide an exhaust emission control device for an internal combustion engine, determining NOx slip and ammonia slip in an SCR catalyst by simple structure and easy control using a NOx sensor. SOLUTION: When a NOx concentration deviation Ne1 being a difference between an actu...

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Bibliographische Detailangaben
1. Verfasser:	YOKOMURA HITOSHI
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 provide an exhaust emission control device for an internal combustion engine, determining NOx slip and ammonia slip in an SCR catalyst by simple structure and easy control using a NOx sensor. SOLUTION: When a NOx concentration deviation Ne1 being a difference between an actual NOx concentration Na1 detected by the NOx sensor provided on the exhaust gas downstream side of the SCR catalyst (selective catalytic reduction catalyst) and a previously set appropriate NOx concentration Nr, is larger than a predetermined value α, a urea water adding amount is reduced by a predetermined amount, and it is determined as NOx slip or ammonia slip if a NOx concentration deviation Ne2 after reducing the urea water adding amount is larger or smaller than the NOx concentration deviation Ne1 before reduction. COPYRIGHT: (C)2008,JPO&INPIT