DIAGNOSTIC DEVICE OF EXHAUST GAS POST-TREATMENT DEVICE FOR INTERNAL COMBUSTION ENGINE

PROBLEM TO BE SOLVED: To precisely diagnose deterioration of NOx trap catalyst. SOLUTION: Deterioration of catalyst is diagnosed based on change of air-fuel ratio (or HC amount) on a catalyst outlet side for change of air-fuel ratio (or HC amount) on a catalyst inlet side when performing rich spike...

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Bibliographische Detailangaben
Hauptverfasser:	MIURA MANABU, SHIRAKAWA AKIRA, YASUHARA KOSUKE
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 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 WEAPONS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To precisely diagnose deterioration of NOx trap catalyst. SOLUTION: Deterioration of catalyst is diagnosed based on change of air-fuel ratio (or HC amount) on a catalyst outlet side for change of air-fuel ratio (or HC amount) on a catalyst inlet side when performing rich spike operation as first deterioration diagnosis. When it is determined that catalyst is deteriorated by the first deterioration diagnosis, operation is shifted to theoretical air-fuel ratio operation to feedback-control air-fuel ratio on the catalyst outlet side in order to diagnose deterioration of catalyst finally based on inversion cycle of feedback amount at this time. COPYRIGHT: (C)2005,JPO&NCIPI