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Two-Stroke Gas Exchanging Method for Controlling Auto-Ignition : Activated Radical Combustion

Article of Honda R&D Technical Review Vol.15 No.1


The auto-ignition is focused as a combustion process, where improving efficiency and lowering NOx emission could be compatible. A current subject would be controlling combustion process. Honda demonstrated a method to control the auto-ignition, i.e. Activated Radical (AR) Combustion, in several commercial motorcycle engines.
Through the experimental analyses of the AR Combustion, this article shows that control of the gas exchange generates a temperature for the auto-ignition in the end of compression stroke, due to heat exchange between residual and new mixture. It is also revealed that its combustion speed is affected by the engine speed, scavenging efficiency and etc, however, 10% to 90% mass burn timing is settled on the same crank-angle duration, as result, regardlessly of the engine operating conditions. This is owing to the dualism of the residual gas, i.e. combustion promotion action as heat energy potential and the inhibitory action as the inert gas. Both action should balance for the two-stroke gas exchanging method for controlling auto-Ignition.


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Author (organization or company)

Yoichi ISHIBASHI(Asaka R&D Center)、Kenji NISHIDA(Asaka R&D Center)、Yukio SAKAI(Asaka R&D Center)、Hisashi SAKUYAMA(Asaka R&D Center)

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