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Combustion Variation for HCCI Engines Equipped with Re-Breathing System~Influence of In-Cylinder Gas Temperature and Composition at Compression Start on Combustion Phasing
Published October 03, 2012 by Society of Automotive Engineers of Japan in Japan
Homogeneous Charge Compression Ignition (HCCI) engine has the potential to achieve lower NOx and PM emissions with high thermal efficiency. However the operation region is limited by knocking at high load. Combustion phasing retard is one of the methods to avoid knocking. But unstable combustion occurs on condition of excessive combustion phasing retard. This study investigates how the cycle-to-cycle variations of HCCI engine are affected by temperature and composition of charged gas. We obtained the result that there is correlation between in-cylinder mass-averaged gas temperature at IVC and CA50. But there is no correlation on condition of excessive combustion phasing retard.