HCCI Combustion Based on Gasoline Split Direct Injection with Negative Valve Overlap

A GDI-HCCI engine model was developed by coupling the CHEMKIN code with AVL BOOST?engine cycle simulation code. HCCI combustion was experimentally investigated and simulation analysis was carried out in a 4-stroke gasoline direct injection (GDI) engine with variable negative valve overlap (NVO). By combining split direct injection (SDI) with NVO, the history of the mixture temperature and concentr…