AIR-FUEL RATIO CONTROL SYSTEM FOR INTERNAL COMBUSTION ENGINE

PROBLEM TO BE SOLVED: To correct output fluctuation to a deterioration of an air-fuel ratio sensor in a catalyst upstream side. SOLUTION: A catalyst 3 having oxygen storage ability is installed in an engine exhaust passage, an oxygen storage quantity is estimated on the basis of an output of the air...

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Bibliographische Detailangaben
Hauptverfasser:	KOBAYASHI HIDEAKI, KAKIZAKI SHIGEAKI
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 correct output fluctuation to a deterioration of an air-fuel ratio sensor in a catalyst upstream side. SOLUTION: A catalyst 3 having oxygen storage ability is installed in an engine exhaust passage, an oxygen storage quantity is estimated on the basis of an output of the air-fuel ratio sensor 4 in the upstream side of the catalyst 3, and an air-fuel ratio is controlled so that the oxygen storage quantity matches a desired value. When an output of a downstream side air-fuel ratio sensor 5 continues to be in a lean side or a rich side exceeding determination timing which changes with operating conditions, the output of the upstream side air-fuel ratio sensor 4 is corrected on the basis of the output of the downstream side air-fuel ratio sensor 5.