AIR-FUEL RATIO CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE

PROBLEM TO BE SOLVED: To prevent reduction in accuracy of air-fuel ratio control caused by an air-fuel ratio fluctuation caused in transition of activation in an exhaust emission control catalyst of an internal combustion engine. SOLUTION: When any of the cooling water temperature THW ≤ THWh ("...

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Bibliographische Detailangaben
Hauptverfasser:	ITO TAKEKAZU, KUSAJI HIDESHI
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING 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 HEATING HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS LIGHTING MACHINES OR ENGINES IN GENERAL MECHANICAL ENGINEERING STEAM ENGINES SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF WEAPONS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To prevent reduction in accuracy of air-fuel ratio control caused by an air-fuel ratio fluctuation caused in transition of activation in an exhaust emission control catalyst of an internal combustion engine. SOLUTION: When any of the cooling water temperature THW ≤ THWh ("NO" in S182), the upstream side exhaust temperature Texin ≤ Texh ("NO" in S184) or the downstream side exhaust temperature Texout ≤ Texh ("NO" in S186) is realized, "OFF" is set in a catalyst activation stable time flag Fcat as the air-fuel ratio varying timing (S194). Thus, air-fuel ratio feedback control is prohibited on the air-fuel ratio control processing side. Thus, even if the air-fuel ratio fluctuation is caused in the transition of activation, since a detecting value of an air-fuel ratio sensor is prevented from having influence on the air-fuel ratio feedback control, reduction in accuracy of the air-fuel ratio control can be prevented. COPYRIGHT: (C)2005,JPO&NCIPI