液压可变气门系统压力波动的影响分析  

Analysis on pressure fluctuation of hydraulic variable valve actuation

作　　者：金兆辉 谷乐祺 洪伟[1] 解方喜[1] 尤田 JIN Zhao-hui;GU Le-qi;HONG Wei;XIE Fang-xi;YOU Tian(State Key Laboratory of Automotive Simulation and Control,Jilin University,Changchun 130022,China;Engineering Branch,Changchun University of Technology,Changchun 130033,China)

机构地区：[1]吉林大学汽车仿真与控制国家重点实验室,长春130022 [2]长春职业技术学院工程技术分院,长春130033

出　　处：《吉林大学学报（工学版）》2022年第4期773-780,共8页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(51876079);吉林省科技发展计划项目(20200403150SF);中央高校基本科研业务费专项资金项目;以汽车运动为导向的能源与动力工程专业“五育”并举式创新实践教学改革与探索(NSJZW2021Y-35)。

摘　　要：针对液压可变气门机构实际运行中系统会产生压力波动,影响可变气门机构的工作性能这一问题,分析了压力波动产生的原因,并采取了有效措施减小压力波动。通过试验及AMESim仿真探究了气门弹簧刚度、气门活塞质量、节流孔径大小等关键参数对系统压力波动的影响。研究表明:当气门落座速度小于0.5 m/s时,增大薄壁孔径可以有效减小压力波动;增加气门弹簧刚度可以减小压力波动幅值;减小气门活塞质量有利于减小压力波动;增大气门活塞直径,压力波动幅值明显减小,最大可减小2.719 MPa;减小系统液压油总容积,可减少压力波动次数。The pressure fluctuation of the hydraulic variable valve actuation system may be produced in the actual operation,which will affect the performance of the variable valve actuation. In this paper,the reason and trend of pressure fluctuation are analyzed by combining experiment and simulation,and effective measures are taken to reduce pressure fluctuation. It is found that the key parameters such as valve spring stiffness,valve piston mass and the diameter size of the thin-walled hole,all have effect on the system pressure fluctuation. The research shows that when the valve-seating velocity is less than 0.5 m/s,the pressure fluctuation can be effectively reduced by choosing a larger thin-walled hole. The pressure fluctuation amplitude can be reduced by increasing the valve spring stiffness. The pressure fluctuation can be decreased by reducing the valve piston mass. When the diameter of valve piston increases,the pressure fluctuation amplitude decreases significantly,which can be reduced by 2.719 MPa at most. By reducing the total hydraulic fluid volume of the system can reduce the number of pressure fluctuations.

关 键 词：动力机械工程 液压可变气门机构 AMESIM 压力波动 气门落座速度 气门运动特性 

分 类 号：TK417[动力工程及工程热物理—动力机械及工程]