防爆柴油机电控单体泵喷油加速率的特性研究

Research on Characteristics of the Acceleration Rate of Electric Unit Pump Fuel Injection System in Explosion-Proof Diesel Engine

喷油速率对防爆柴油机的排放和燃油经济性有着决定性影响,喷油加速率决定了喷油速率缓升阶段与急降阶段变化快慢的平均水平。在AMESIM环境中,建立防爆柴油机电控单体泵燃油系统模型,通过试验对比,验证模型能准确预测防爆柴油机电控单体泵系统的喷油速率特性。通过仿真模型,研究了特性参数对喷油加速率的影响规律,并得出结论:随着转速、柱塞直径、凸轮型线速率、高压油管长度、喷孔直径与喷孔流量系数的增加,缓升阶段的喷油加速率增加;随着喷油脉宽与高压油管直径的增加,缓升阶段的喷油加速率减小;随着喷油脉宽、柱塞直径与凸轮型线速率的增加,急降阶段的喷油加速率增加。

Injection rate has a decisive influence on injection rate of explosion-proof diesel engine emissions and fuel economy, and the fuel injection rate determines the injection rate slow rise stage and pelt phase changes in the speed of the average level. In the AMESIM environment, the model of the fuel system of the diesel engine electronic control unit pump is established, and the model can accurately predict the fuel injection rate characteristics of the electronic control unit pump system of the explosion-proof diesel engine. And through the model simulation of the influences of characteristic parameters of the fuel injection rate, and that with the increase of speed, plunger diameter, rate of cam contour line, high pressure tubing length, nozzle hole diameter and the orifice discharge coefficient, slow rising phase of the injection rate increases; with the increase of fuel injection pulse width and high pressure oil pipe diameter, the slow rise stage injection rate decreases; and with the increase of fuel injection pulse width, the diameter of the plunger and the cam type line rate, plunging stage spray accelerated rate increases.