Post-catalyst cylinder imbalance monitor

Methods and systems are provided for detecting cylinder air-fuel imbalance. In one example, a method may include adjusting engine operation based on an indication of cylinder air-fuel imbalance. The imbalance may be detected based on output from a second exhaust gas sensor and a plurality of individ...

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Bibliographische Detailangaben
1. Verfasser:	DOUGLAS JAMES MCEWAN
Format:	Patent
Sprache:	chi ; 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 WEAPONS
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Beschreibung
Zusammenfassung:	Methods and systems are provided for detecting cylinder air-fuel imbalance. In one example, a method may include adjusting engine operation based on an indication of cylinder air-fuel imbalance. The imbalance may be detected based on output from a second exhaust gas sensor and a plurality of individual cylinder weighting factors, the second sensor located in an exhaust system downstream of a first sensor located in the exhaust system.