AIR-FUEL RATIO CONTROL DEVICE

PROBLEM TO BE SOLVED: To provide an air-fuel ratio control device that achieves drivability improvement by reducing an unlearned area in a map and high accuracy of air-fuel ratio control while avoiding increase in storage capacity and an operation load when correction amount obtained at a feedback c...

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Bibliographic Details
Main Author NAGATA KOICHI
Format Patent
LanguageEnglish
Published 16.02.2012
Subjects
BLASTING
COMBUSTION ENGINES
CONTROLLING COMBUSTION ENGINES
HEATING
HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
LIGHTING
MECHANICAL ENGINEERING
WEAPONS
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Summary:PROBLEM TO BE SOLVED: To provide an air-fuel ratio control device that achieves drivability improvement by reducing an unlearned area in a map and high accuracy of air-fuel ratio control while avoiding increase in storage capacity and an operation load when correction amount obtained at a feedback correction of an air-fuel ratio control command value is stored and updated in the map as a learning value.SOLUTION: The air-fuel ratio control device includes: a feedback correction means for correcting a control command value outputted to an actuator of a fuel injection valve which controls an actual air-fuel ratio of an engine based on oxygen concentration in exhaust; and a learning value updating means for storing and updating the correction amount by the feedback correction means as the learning value in a learning map Mg1 in association with an operation state amount. The learning map Mg1 is constituted by dividing the operation state amount into a plurality of large areas so that a target air-fuel ratio in a corresponding area is equal.
Bibliography:Application Number: JP20100169791