高压共轨喷油器响应时间的仿真分析  

Simulating Analysis of Responding Time of High Pressure Common Rail Injector

作　　者：赵金辉[1] 李冬伟[1] 辛周 

机构地区：[1]军械工程学院,河北石家庄050003 [2]总装车船局驻西安军代室,陕西西安710043

出　　处：《计算机仿真》2014年第11期231-235,共5页Computer Simulation

摘　　要：喷油器是发动机高压共轨燃油喷射系统的关键部件,其响应时间对发动机燃油利用率和废气排放具有重要影响。依据燃油流动连续性原理建立了喷油器各腔室的微分方程模型,建模时考虑了流量限制阀、三通管的影响,并将燃油的密度、弹性模量视为压力的函数。通过仿真求解了线圈电流、球阀行程、针阀行程和喷射流量随时间的变化曲线,得到了电流上升、下降时间,球阀及针阀的开启、关闭时间,喷射的起止时间。仿真结果表明,喷油结束时间较开始时间要短,能够满足慢开快关的喷油要求。Injector is the key component in the high pressure common rail system, and its responding time has large influence on the engine flue utilization and gas emission. The physical model of the injector was established based on the fuel flow principle of continuity, with the consideration of flow limiting valve and three-way-valve, and density and elasticity of the fuel seen as functions of the pressure. The coil current, bullet valve displacement, needle valve displacement and injecting flux＇ s change curves with time were calculated to obtain the up and down times of the current, the open and close times of the bullet and needle valves, the beginning and ending times of the injecting through simulation. From the result of simulation, the ending time of the injecting is shorter than the beginning time, which can satisfy the demand of slow-open and fast-close.

关 键 词：高压共轨喷油器 响应时间 物理模型 仿真分析 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]