摘要
燃油发动机的高压油管是关键件之一,承担着输送高压燃油的任务。为高压油管设计一个好的压力控制方案,能较大程度地提高发动机高压油管体系设计的通用性、安全性和工作效率。以流体力学理论为指导,以MATLAB数学建模为手段,建立高压油管体系的数学模型。一是建立"燃油压力变化量与密度变化量成正比"的假设,基于质量守恒定律,分析不同工况下的单向阀开启时长;二是结合高压油管实际工作过程,确定一个周期内喷油嘴、喷孔喷出的燃油量,计算高压油管中的燃油密度,得到凸轮角速度的优化方案;三是对高压油管体系进行改进,增加一个喷油嘴和单向减压阀,计算凸轮角速度的调整值。高压油管压力控制方案具有通用性,在燃油发动机设计中具有一定的实用价值。
The high-pressure tubing of fuel engine is one of the key parts,undertaking the task of delivering the high-pressure fuel.To design a good scheme of pressure control for the high-pressure tubing can greatly improve the generality,safety and efficiency of systematical design on the high-pressure tubing.Under the guidance of fluid mechanics theory and by means of MATLAB mathematical modeling,the mathematical model of high-pressure tubing system is established.First,establish the hypothesis that"the change of fuel pressure is proportional to the change of fuel density",and analyze the opening time of check valve under different working conditions based on the law of conservation of mass.Second,determine the amount of fuel ejected from the nozzle and orifice in a cycle while considering the actual working process of high-pressure tubing,and calculate the fuel density in high-pressure tubing to obtain the optimization scheme of cam angular velocity.Third,optimize the cam angular velocity.An injection nozzle and a one-way pressure reducing valve are added to improve the high-pressure tubing system,and the adjustment value of cam angular velocity is calculated.The pressure control scheme of high-pressure tubing is universal,which has a certain practical value in the design of fuel engine.
作者
宋常修
张善莹
崔忠瑞
张雅婷
邵玉昕
SONG Chang-xiu;ZHANG Shan-ying;CUI Zhong-rui;ZHANG Ya-ting;SHAO Yu-xin(Yantai Institute of Technology,School of Economics and Management,Yantai 264000,China;Yantai Institute of Technology,School of Foreign Languages,Yantai 264000,Chin)
出处
《工业技术创新》
2021年第2期132-137,共6页
Industrial Technology Innovation
关键词
高压油管
压力控制
凸轮角速度
减压阀
燃油发动机
流体力学
High-Pressure Tubing
Pressure Control
Cam Angular Velocity
Pressure Reducing Valve
Fuel Engine
Fluid Mechanics
