本文着重介绍缸径只有75mm 的小型高速直喷式柴油机的喷油压力、供油提前角、喷孔分布和喷注落点、柱塞直径和高压油管内径等供油系统参数的选择及对发动机性能的影响。文中还给出了试验机的示功图、压升率图、放热规律图和缸内温度图以及多种燃烧特性参数值。文章最后对研制小缸径直喷式柴油机的可行性作了探讨。 This article focuses on the selection of fuel injection system parameters such as injection pressure, feed advance angle, orifice distribution and nozzle placement, plunger diameter, and tubing diameter of high pressure tubing for a small high speed direct injection diesel engine with a bore diameter of only 75 mm and its performance on engine performance Impact. The paper also gives the dynamometer of the testing machine, the rate of pressure rise, the law of exothermic heat and in-cylinder temperature and the parameters of various combustion characteristics. Finally, the paper discusses the feasibility of developing a small bore direct injection diesel engine.