1720 DI ディーゼル機関における吸・排気絞り時の燃焼圧力変動

概要

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Throttling of intake and exhaust ports in DI diesel engines are often used to get high EGR rate and to rise exhaust gas temperature at light load. However, cylinder-to-cylinder deviations in the combustion and the exhaust emission are not clear during the throttling process. This study attempts to investigate correlations between cylinder-to-cylinder deviations in the fuel injection characteristics and combustion and THC emission when intake and exhaust ports are throttled at idling. It is concluded that cylinder-to-cylinder deviations in THC emissions are larger at intake port throttling, but is not significant at exhaust port throttling. Cylinder-to-cylinder deviation in combustion is responsible for the deviations in THC but that is not dominating factor. Deviations in the in-cylinder conditions such as carbon deposits and in-cylinder gas flow are thought to play a larger role in THC deviations.
社団法人日本機械学会の論文
2002-09-20