GDI喷油器针阀动力学特性研究

发布时间：2018-05-21 10:17

本文选题：GDI喷油器 + 针阀振荡　；参考：《中国机械工程》2016年03期

【摘要】：针阀动力学行为是影响GDI(汽油直接喷射式)喷油器工作稳定性和可靠性的关键因素。为了揭示不同参数对针阀动力学特性的影响机理,以某款GDI多孔喷油器为对象,依据针阀的受力特点建立了针阀动力学模型和GDI喷油器AMESim工作过程仿真模型,仿真分析了阀座锥角、阀座与钢球的接触方式、阀针运动质量等参数对针阀动力学特性的影响规律。结果表明:适当减小阀座锥角、增大阀座与钢球的接触面积、减小针阀运动质量可有效抑制开启或落座过程中针阀的振荡幅度。根据仿真分析结果对GDI喷油器的结构进行了综合改进,结果表明,结构改进后,GDI喷油器针阀的动力学特性得到显著改善。
[Abstract]:The dynamic behavior of needle valve is the key factor to affect the stability and reliability of GDI injector. In order to reveal the mechanism of the influence of different parameters on the dynamic characteristics of needle valve, the dynamic model of needle valve and the simulation model of AMESim working process of GDI injector are established according to the mechanical characteristics of a GDI porous injector. The influence of the cone angle of the valve seat, the contact mode between the valve seat and the steel ball and the movement quality of the valve needle on the dynamic characteristics of the needle valve are analyzed by simulation. The results show that properly reducing the cone angle of the valve seat, increasing the contact area between the valve seat and the steel ball, and reducing the motion quality of the needle valve can effectively suppress the oscillatory amplitude of the needle valve during opening or sitting. According to the results of simulation analysis, the structure of GDI injector is comprehensively improved. The results show that the dynamic characteristics of the needle valve of GDI injector are improved significantly after the structural improvement.
【作者单位】：上海理工大学;上海交通大学;
【基金】：国家自然科学基金资助项目(51275309)
【分类号】：TK411

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