Experiments have been conducted to explore the effects of split injection strategy on highly premixed charge combustion(HPCC) fueled with polyoxymethylene dimethyl ethers(PODE) and gasoline on a modified single-cylinder heavy-duty diesel engine. The results show that the split injection strategy can shorten the ignition delay and advance the auto-ignition timing. Lower heat release rate can be obtained with a smaller or larger injection interval for HPCC of gasoline and PODE

and the highest heat release rate with compact heat release pattern can be obtained with the injection interval of 35° crank angles. The effects of injection interval and main injection timing on the maximum pressure rise rate and indicated thermal efficiency are enhanced with higher pilot injection ratio. An optimized split injection strategy can significantly improve the indicated thermal efficiency

and reduce total HC and soot emissions; however

penalty in the maximum pressure rise rate is also observed with such strategy. It is seen that the split injection strategy can be helpful to reduce soot emission from HPCC of gasoline and diesel at high loads

while single injection strategy is more suitable for HPCC of gasoline and PODE for pressure rise rate suppression.