摘要
为了研究喷油器关键结构对喷油特性的影响,运用hydsim建立喷油系统仿真模型,并搭建喷油系统试验台架,验证仿真模型的准确性。仿真分析发现系统存在液力延迟、喷油压力不稳、针阀波动等现象。针对这些现象对系统喷油器结构优化设计,取消通往控制腔的高压油路,直接使高压燃油从蓄压腔流经压力室和喷孔进入气缸中,减缓蓄压腔内高压燃油回流。通过仿真对比优化前后系统针阀运动、喷油压力、喷油率等参数,证明优化后的喷油系统能够消除液力延迟,减缓喷油压力波动,提高针阀运动的平稳性。
In order to study the influence of the key structure of the injector on the fuel injection characteristics, hydsim was used to establish the fuel injection system simulation model, and the fuel injection system test bench was built to verify the accuracy of the simulation model. Through simulation analysis it was found that the system had hydraulic delay, unstable injection pressure, needle valve fluctuations and so on. In order to optimize the design of the system injector structure for these phenomena, the high-pressure oil passage to the control chamber was eliminated, and the high-pressure fuel was directly flowed from the accumulator chamber through the pressure chamber and the injection hole into the cylinder to slow down the high-pressure fuel return in the accumulator chamber. By simulating and comparing the parameters of the system needle valve movement, fuel injection pressure and fuel injection rate before and after optimization, it was proved that the optimized fuel injection system could eliminate the hydraulic delay, reduce the injection pressure fluctuation and improve the stability of the needle valve movement.
作者
朱凌俊
孙海龙
陈国金
龚友平
岳义帅
ZHU Ling-jun;SUN Hai-long;CHEN Guo-jin(College of Mechanical Engineering,Hangzhou Dianzi University,Hangzhou 310018,China)
出处
《能源工程》
2019年第5期24-30,共7页
Energy Engineering
基金
浙江省重点研发计划项目(2015C04002)
国家自然科学基金资助项目(51405117,51675148,51541507)
关键词
喷油特性
喷油系统
结构优化
hydsim
fuel injection characteristics
fuel injection system
structure optimization
hydsim
