针阀升程是柴油机燃油系统的重要参数。
传统的柴油机喷油器针阀升程测量方式多为接触式。
Traditionally, the way to measure the needle displacement of oil injector is of contact pattern.
本文通过对柴油机配置不同喷油器所进行的排放对比试验，研究分析了喷油器喷孔流量系数、喷孔直径、针阀升程对排放的影响。
In this paper, the influence of flow coefficient of injector hole, hole diameter and needle lift on emission is studied through contrast experiment of different injectors.
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