This article analyses the cause of the freezing phenomenon on the tip and body of the end part of the injector (EPI) assembly in a LPG injection system. Based on the physical properties of LPG, fuel injection conditions, environmental conditions, material parameters, shape and size of the EPI of the LPG injector assembly, and thermodynamic process taking place in the EPI tube, we established a calculation model to determine the pressure course of LPG in the tube. Results of the pressure courses measured in the experiment and calculation model have proven to be similar. The calculation model showed that it was not possible to manufacture an EPI using changes in material, shape and size to completely eliminate freezing. However, adjusting input parameters for EPI size and shape enabled us to determine the optimal geometry of the EPI and showed the need for a heating element device to deal with freezing on the tip and body of the EPI. An experiment on the EPI with a heating element device demonstrated the effectiveness of this solution.

本文分析了液化石油气喷射系统中喷射器（EPI）组件末端部分的尖端和主体出现冻结现象的原因。根据LPG的物理特性、燃料喷射条件、环境条件、材料参数、LPG喷射器组件EPI的形状和尺寸以及EPI管内发生的热力学过程，我们建立了计算模型来确定压力过程管中的液化石油气。在实验和计算模型中测量的压力过程的结果已被证明是相似的。计算模型表明，不可能通过改变材料、形状和尺寸来制造 EPI 以完全消除冻结。然而，调整 EPI 尺寸和形状的输入参数使我们能够确定 EPI 的最佳几何形状，并表明需要加热元件设备来处理 EPI 尖端和主体上的冻结。带有加热元件装置的 EPI 实验证明了该解决方案的有效性。