喷油器控制阀偶件燃油泄漏对喷油性能的影响

张子威，徐春龙，高怡，李春晖

中国北方发动机研究所(天津)，天津  300400

摘要：为研究大功率柴油机喷油器控制阀偶件泄漏对喷油性能的影响，应用AMESim建立喷油器仿真模型，通过喷油量试验验证仿真模型的准确性。仿真分析偶件泄漏规律和控制阀偶件配合间隙对喷油性能的影响，得到针阀运动、喷油持续期等参数随偶件配合间隙变化的规律。结果表明：随着针阀偶件配合间隙增大，喷油速率和喷油持续期增大，针阀开启时间提前、关闭时间延后；随着控制柱塞偶件配合间隙增大，喷油速率和喷油持续期减小，针阀开启时间呈先保持不变、后略有延后的变化趋势，针阀关闭时间呈先保持不变、后提前的变化趋势。

关键词：喷油器；控制阀偶件；燃油泄漏；针阀运动；喷油速率；喷油持续期

Effect of fuel leakage of injector control valve coupling oninjection performance

ZHANG Ziwei, XU Chunlong, GAO Yi, LI Chunhui

China North Engine Research Institute (Tianjin), Tianjin 300400, China

Abstract：In order to study the effect of injector control valve coupling leakage on fuel injection performance of a high-power diesel engine, a simulation model is established by AMESim, and its accuracy is verified by the test data of fuel injection. The leakage law of coupling parts is simulated and analyzed. The results show that with the increase of the fit clearance of the needle valve, the injection rate and injection duration increases, the opening time of the needle valve advances and the closing time delays. With the increase of the matching clearance of the control plunger coupling, the injection rate and injection duration decreases, the opening time of the needle valve first remaines unchanged and then slightly delayed, and the closing time of the needle valve first remaines unchanged and then advanced.

Keywords:injector；control valve coupling；fuel leakage；needle movement；injection rate；injection duration