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在一台传统的单缸直喷式柴油机上安装了3个喷油器,一个喷油器垂直装在气缸中心,另两个喷油器斜装在气缸中心两侧。该系统能单独控制每个喷油器的喷油定时和喷油量。还能单独控制中置喷油器和侧置喷油器的喷油压力。采用该系统能控制燃油喷入燃烧室后的空间分布和瞬时分布,而采用传统喷油装置时不可能做到这一点。本研究表明,在中置喷油器主喷射后由两个侧置喷油器喷射少量燃油,能使颗粒排放和燃油消耗率得到改善,而NO_x仍能保持较低的水平。为了确定燃烧室中燃油空间分布对发动机性能和排放的影响特征,通过改变中置喷油器和侧置喷油器的相对喷油方向进行了测量。还进行了所有3个喷油器在一次循环中总共喷射6次的分段喷油试验,其结果使颗粒物排放明显减少,但燃油消耗率变差。
Three fuel injectors were installed on a conventional single cylinder direct injection diesel engine with one injector vertically mounted on the center of the cylinder and the other two on opposite sides of the center of the cylinder. The system can control each injector’s injection timing and fuel injection quantity separately. You can also separately control the injection pressure of the center injector and the side injector. The system is used to control the spatial distribution and instantaneous distribution of fuel injected into the combustion chamber, which is not possible with conventional fuel injection systems. This study shows that the injection of a small amount of fuel by two side injectors after the main injection of the pilot injectors can result in improved particle emission and fuel consumption, while NO_x remains low. To determine the impact of fuel space distribution in the combustion chamber on engine performance and emissions, measurements were made by changing the relative injection direction of the center injector and the side injector. A segmented injection test was also conducted in which all three injectors sprayed a total of six times in a single cycle, resulting in a significant reduction in particulate emissions but a lower fuel consumption rate.