Combustion characteristics of diesel HCCI engine: An experimental investigation using external mixture formation technique

► Combustion characterization of diesel HCCI with external mixture formation. ► 'Diesel vaporizer' was successful in achieving HCCI combustion. ► Efficient HCCI combustion achieved up to medium load conditions. ► Combustion parameters are effectively controlled by EGR. ► Control of SOC and ROHR at higher loads remains challenging.