An experimental system was developed to evaluate the fuel injection parts of a gasoline direct injection engine. An AC motor and an inverter were used to rotate the camshaft in the engine cylinder head. A single plunger high-pressure fuel pump (HPFP) driven by a square cam at the end of the camshaft was used in the gasoline direct injection engine. The rotation position of the square cam was measured by a rotary encoder. The developed system allows control of the camshaft rotation speed, the HPFP pressure control valve (PCV) opening and closing timing, and the fuel injection duration, which are three important factors affecting the fuel rail pressure (FRP). It is confirmed that the fuel rail pressure can be made to vary wit different combinations of these three factors. By using the experimental system developed in this study, the fuel rail pressure can be effectively controlled in the range of 3 MPa to 20 MPa. The most influential factor for control of the fuel rail pressure was the HPFP PCV opening and closing timings. With the proposed using the experimental system, the rail pressure, fuel rail pressure wave characteristics, and the injector drive characteristics can all be assessed under various fuel injection conditions.

开发了一个实验系统来评估汽油直喷发动机的燃油喷射部件。使用交流电动机和逆变器来旋转发动机气缸盖中的凸轮轴。在汽油直喷发动机中，使用了由凸轮轴端部的方形凸轮驱动的单柱塞高压燃油泵（HPFP）。方形凸轮的旋转位置通过旋转编码器测量。开发的系统可以控制凸轮轴转速，HPFP压力控制阀（PCV）的打开和关闭正时以及燃油喷射持续时间，这是影响燃油导轨压力（FRP）的三个重要因素。已经证实，可以通过这三个因素的不同组合来改变燃料导轨压力。通过使用本研究开发的实验系统，可以将燃油导轨压力有效地控制在3 MPa至20 MPa的范围内。控制燃油导轨压力的最有影响力的因素是HPFP PCV的打开和关闭正时。通过使用建议的实验系统，可以在各种燃料喷射条件下评估轨道压力，燃料轨道压力波特性和喷射器驱动特性。