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在直接喷射式柴油机上进行了燃用二甲醚的试验研究，对柱塞有效行程和柱塞直径、供油提前角、喷油压力、进气涡流比、喷嘴型式等燃烧系统主要参数对发动机功率和热效率的影响进行了研究，在燃料供给系统中增加燃油输送泵，消除了气阻，发动机可以在宽广的转速和负荷范围内稳定运行，发动机热效率比原机高３％ 。在优化燃烧系统参数的基础上对示功图和排放的测量及计算表明：二甲醚发动机最高爆发压力、最大压力升高率和 Ｎ Ｏｘ 排放均低于原机，烟度排放为０。试验结果显示了直喷式柴油机燃用二甲醚在降低排放方面的优越性能。
In the direct injection diesel engine, a pilot study of using dimethyl ether was conducted. The main parameters of the combustion system, including effective stroke of the plunger and plunger diameter, fuel supply advance angle, injection pressure, intake vortex flow ratio and nozzle type, Power and thermal efficiency. The fuel delivery pump is added to the fuel supply system to eliminate the air resistance. The engine can run stably over a wide speed range and load range. The thermal efficiency of the engine is 3% higher than that of the original engine. Based on the optimization of the combustion system parameters, the measurement and calculation of dynamometer and emission show that the maximum burst pressure, the maximum pressure rise rate and the NOx emission of DME are lower than those of the original engine, and the smoke emission is zero. The test results show the superior performance of direct injection diesel engine DME in reducing emissions.