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对内燃机车柴油机电控喷油系统进行了数值模拟计算,将电磁阀闭合后的燃油流动过程等效为一维流体非定常流动,用连续性方程和动量方程建立了数学模型。将电控单体泵系统划分为单体柱塞泵、供油凸轮、高压油管、电磁阀和喷油器几个子模块并分别进行数值计算,确定了油管两端的边界条件。以单体泵初始状态和外部条件为输入量,采用特征线法得出各点的燃油压力,并将仿真结果以图形的方式输出;在电控喷油泵试验台上进行了压力特性试验,得到不同凸轮轴转速下的泵、嘴端的喷油压力波形。两者对比验证了数值计算和分析的准确性,得出电控单体泵各部件参数对喷油过程的影响,为内燃机车柴油机电控燃油喷射系统的研制打下了理论基础。
The numerical simulation of diesel fuel injection system of diesel locomotive is carried out. The fuel flow after solenoid valve closing is equivalent to one-dimensional fluid unsteady flow, and the mathematical model is established by the continuity equation and momentum equation. The electronic control unit pump system is divided into a single plunger pump, fuel supply cam, high pressure tubing, solenoid valve and injector several sub-modules and were calculated, respectively, to determine the boundary conditions at both ends of the tubing. Taking the initial state of the single pump and the external conditions as input, the pressure of each point was obtained by the characteristic line method, and the simulation results were output graphically. The pressure characteristic test was carried out on the test bench of the electronically controlled fuel pump to obtain Different camshaft speed pump, the mouth of the injection pressure waveform. The comparison between the two verifies the accuracy of the numerical calculation and the analysis. The influence of the parameters of the electronic control unit pump on the injection process is obtained, laying a theoretical foundation for the development of the diesel engine electronically controlled fuel injection system of the diesel locomotive.