Air-fuel ratio controlling device for an internal combustion engine

In accordance with an output of an oxygen concentration sensor 16, an air-fuel ratio correction coefficient KO2 is periodically set to values respectively corresponding to a leaner air-fuel ratio and a richer air-fuel ratio with respect to a theoretical air-fuel ratio (steps S22 to S28). Based on an...

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Bibliographische Detailangaben
1. Verfasser:	TAKANOHASHI TOSHIKATSU
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 FOR ADAPTATION TO CLIMATE CHANGE TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE WEAPONS
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Beschreibung
Zusammenfassung:	In accordance with an output of an oxygen concentration sensor 16, an air-fuel ratio correction coefficient KO2 is periodically set to values respectively corresponding to a leaner air-fuel ratio and a richer air-fuel ratio with respect to a theoretical air-fuel ratio (steps S22 to S28). Based on an output of an oxygen concentration sensor 16, a NOx amount counter nNOx is counted up, and the amount of NOx absorbed by a NOx absorbent catalyst is estimated. When the value of the NOx amount counter nNOx reaches a preset value NSAT, an air-fuel ratio of an air-fuel mixture is set to be further richer than the richer air-fuel ratio.