Engine´s Working Characteristics with Blended Fuel of Biodiesel and Diesel Oil in HCCI Combustion Mode

The mechanism of homogeneous charge compression ignition (HCCI) combustion is introduced. Based on single zone model of HCCI combustion under early injection, coupled with fuel oxidation reaction dynamical model, the mathematics combustion model in cylinder is built and simulated, then the engine´s working characteristics combusted with the biodiesel and diesel oil is compared with the original, it shows that the calculation is matched with the trial results well. And through analyzing the HCCI combustion performance with the different mixture ratio of biodiesel and diesel oil, the two-stage heat release characteristics is appeared in the combustion, and the instantaneous cylinder pressure peak value is increased with the increasing mixture ratio.