Combustion and emission analysis of the direct DME injection enabled and controlled auto-ignition gasoline combustion engine operation

► Dual Fuel CAI combustion is achieved by PVO without intake heating. ► In-cylinder fuel blending is used to vary the auto-ignition quality of the charge mixture. ► DME injection timing and quantity affect the combustion characteristics. ► The changed combustion characteristic will aid to extend CAI operating range. ► Compare to SI engine, over 90% reduction of NOx emission is achieved.