DETERIORATION DETECTION DEVICE FOR OXYGEN CONCENTRATION SENSOR

PROBLEM TO BE SOLVED: To provide a deterioration detection device capable of further accurately determining deterioration of an oxygen concentration sensor provided in a downstream side of a catalyst for exhaust emission control. SOLUTION: A target equivalent ratio KCMD is set to a rich side predete...

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Bibliographische Detailangaben
1. Verfasser:	NAMIKI HIDETOSHI
Format:	Patent
Sprache:	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 STEAM ENGINES 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 provide a deterioration detection device capable of further accurately determining deterioration of an oxygen concentration sensor provided in a downstream side of a catalyst for exhaust emission control. SOLUTION: A target equivalent ratio KCMD is set to a rich side predetermined value KOSO2H corresponding to an air-fuel ratio in a rich side of a theoretical air-fuel ratio over rich set time TRICH. Then the target equivalent ratio KCMD is changed to a lean side predetermined value KOSO2L corresponding to the air-fuel ratio in a lean side of the theoretical air-fuel ratio, and dead time TNR from the time t1 of change to the time t2 when output SVO2 of the oxygen concentration sensor reaches first predetermined voltage SVO2W is measured. Further, variation time TFS required for the output SVO2 of the oxygen concentration sensor to reach second predetermined voltage SVO2STP from the time t2 is measured. When the variation time TFS is larger than a determination threshold value TSVOH set according to the dead time TNR, it is determined that the oxygen concentration sensor 15 is deteriorated. COPYRIGHT: (C)2005,JPO&NCIPI