无静态泄漏电控喷油器压力特性交互作用相关性分析

Correlation analysis of pressure characteristic interaction of electronically controlled injector without static leakage

为揭示无静态泄漏电控喷油器压力波动特性,本文借助AMESim仿真平台,搭建了电控喷油器的数值模型,通过试验数据对比,验证了模型的准确性。定义喷油压力波动与喷油压力降作为压力特性的衡量指标,结合实验设计与相关性分析方法,探究了压力特性与影响参数间交互作用的相关性。结果表明:对于喷油压力波动,进油孔孔径、回油孔孔径、喷孔直径三者间的交互作用具有显著影响,且其相关性受轨压工况的影响显著,在低轨压时,进油孔直径与喷孔直径的交互作用与其成正相关,回油孔孔径与进油孔孔径、喷孔直径的交互作用与其成负相关,在高轨压时各项的相关性相反;对于喷油压力降,在全工况平面内,影响因素的交互作用对其影响微弱,其交互作用可以忽略;影响因素的交互作用对压力特性的影响对轨压工况的变化敏感,与控制脉宽的变化无关。

To reveal the pressure fluctuation characteristics of an electronically controlled injector without static leakage,a numerical model of an electronically controlled injector was established based on the AMEsim hydraulic simulation platform.The accuracy of the model was verified by comparing it with the experimental data.The injec-tion pressure fluctuation and injection pressure drop were defined as the measurement indexes of pressure character-istics.Combined with experimental design and correlation analysis,the correlation between pressure characteristics and the interaction between influencing parameters were explored.The results showed that for the injection pressure fluctuation,the interaction between the fuel inlet orifice,fuel outlet orifice,and nozzle orifice diameters has a sig-nificant effect,and the correlation is significantly affected by the working condition of the rail pressure.At low rail pressure,the interaction between the fuel inlet orifice and nozzle orifice diameters is positively correlated,and the interaction between the fuel outlet orifice,inlet hole,and nozzle orifice diameters is negatively correlated;at high rail pressure,the correlation is opposite.For the injection pressure drop,in the whole working condition plane,the interaction of influencing factors has little effect,and its interaction can be ignored.The effect of the interaction of the influencing factors on the pressure characteristics is sensitive to the change in the rail pressure condition and is not related to the change in the control pulse width.