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Effects of Fuel Ignitability and Heterogeneity of Fuel Concentration on PCCI Combustion
Published October 22, 2008 by Society of Automotive Engineers of Japan in Japan
Event: JSAE Autumn Conference
PCCI combustion simultaneously achieves good fuel economy and very low emissions of NOx and PM. However, since it is a compressed autoignition phenomenon of lean air/fuel mixture, ignition and combustion are predominantly controlled by chemical reactions of fuel. Therefore, this combustion scheme is restricted in partial operation load. To solve those issues using mixture heterogeneity and optimizing fuel ignitability used, authors have developed a control method of mixture heterogeneity. This paper investigates the effects of autoignitability of primary reference fuel and charge heterogeneity on combustion and emissions characteristics by changing the injection quantity ratio of port injection and direct one.