Control method of internal combustion engine

Abstract

Systems and methods for controlling an internal combustion engine include determining presence of charge dilution and selecting a spark restrike mode to provide multiple spark events during a single combustion cycle. Charge dilution may be determined based on commanded air / fuel ratio and exhaust gas recirculation, for example. Multiple spark events may be controlled using time-based restrike or current-based restrike in response to one or more operating parameters or conditions.

Description

【Technical field】 [0001] The present invention relates to a method of controlling an internal combustion engine using multiple spark plugs during a single combustion cycle. 【Background technique】 [0002] Various strategies are used to increase energy density and downsize engines, ie to provide smaller and lighter engines with equal or greater power than more conventional larger and heavier engines. For example, lean operation and cooled external exhaust gas recirculation (EGR) in supercharged (turbocharged or supercharged) engines can be used to increase energy density. Typically, these smaller engines run at higher loads, which reduces pumping losses to further improve fuel economy. However, a more diluted and lean combustible mixture supplied to the engine cylinders is more difficult to ignite and achieve complete combustion. In addition, high turbulence and high BMEP combustion regimes lead to spark extinction. [0003] Existing strategies for improving combustion hav...

AI Technical Summary

Problems solved by technology

Although these methods may be suitable for some applications, increased ignition energy and / or unnecessary re-ignition can lead to premature wear of the spark plug and crevice corrosion leading to associated combustion performance degradation, which can have adverse effects on fuel efficiency, drivability and / or exhaust Emissions have adverse effects

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