李春晖，吴小军，奚星，徐春龙
中国北方发动机研究所燃油系统研究室，天津 300400
摘要：为研究针阀升程对某柴油机共轨喷油器喷油稳定性的影响，在高压共轨性能试验台上对不同针阀升程的喷油器进行性能测试，研究改变针阀升程对共轨喷油器不稳定工况点的影响；根据试验结果搭建AMESim仿真模型，仿真分析不稳定工况点的针阀运动状态。研究发现，增大针阀升程不利于喷油器稳定喷油，增大针阀在最大升程处的维持时间有利于提高喷油器稳定性。研究结果为该型喷油器改进设计提供了支撑。
关键词：共轨喷油器；喷油稳定性；仿真
Abstract:In order to study the effect of needle valve lift on the stability of common rail injector for a diesel engine, the performance of the injector with different needle valve lift is tested on the EFS test bench. The influence of the maximum lift of needle valve on the unstable operating point of a common rail injector is obtained. The AMESim simulation model is built according to the test result, and the movement of needle valve on the unstable operating points are analyzed. The result indicates that increasing the lift of needle valve is not conducive to improving the injection stability, and increasing the holding time of the needle valve at the maximum lift is conducive to improve the injection stability.
Keywords:common rail injector；injection stability；simulation
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