Optimal Strategy for Methanol/DME Dual-Fuel Engine Over Whole Load Ranges

Based on the study of several combustion modes,this paper presents an optimal strategy for the methanol/DME dual-fuel engine over the whole load ranges.At the low load,pure DME HCCI combustion with high EGR rate needs to be adopted to attain relatively high thermal efficiency.At the intermediate loads,HCCI combustion of methanol/DME dual-fuel mode can achieve the clean combustion with high efficiency and low NOx emissions.At the high load,the dual-fuel compound combustion with port injection of DME and in-cylinder late injection of methanol achieves the high power output.