Studying the conversion from traditional diesel engine to engine operating on fire principle due to Homogeneous Charge Compression Ignition (HCCI) based on research of single cylinder diesel engine BD178FE which is used, nonturbocharged, air-cooled, and has a compression ratio of 20. This engine converts to HCCI combustion process at a compression ratio of 15.4, it has a 10 ÷ 30% change Exhaust Gas Recirculation (EGR), rate with 5% division, speed mode from 1200rpm to 2400rpm with division of 400rpm and load modes 10%, 20%, 30% and 50%, which corresponds to a torque of 1.24Nm; 2.48Nm; 3.72Nm and 6.2Nm. The results show that, the HCCI engine operates stably in the research mode with useful torque and is equivalent to the original diesel engine, but the combustion occurs early before the dead point. Gradually increasing the rate of EGR will reduce premature burning and diffuse burning in hot flames.

Keywords: HCCI, EGR, SOC.