摘要
针对柴油机电控双阀燃油喷射系统的喷油控制问题,本文在AMESim环境中建立了电控双阀燃油喷射系统仿真模型,通过线性分析方法,得到了喷油过程中系统的状态矩阵序列。通过系统状态矩阵秩与特征值分布规律,分析了系统喷油过程中的稳定性及其影响因素。结果表明:系统状态矩阵的秩主要受溢流控制阀、针阀控制阀和针阀动作的影响;建压阶段由于柱塞压缩作用及压力波在系统高压容积内的传播、反射和叠加,系统处于非稳定状态;喷油阶段当针阀达到最大升程后,燃油流动状态稳定,且喷孔开启削弱了压力波反射与叠加,使系统稳定性有所增强;喷油结束阶段系统稳定性增强,主要原因是燃油泄流的强阻尼作用与压力波衰减。
Aiming at fuel injection control in the electronically controlled double-valve fuel injection system of a diesel engine,this paper establishes a simulation model of the electronically controlled double-valve fuel injection system in the AMESim environment. The state matrices of the system that change over time during the injection process were acquired by using the linear analysis method. The stability and its influence factors of the system du r-ing injection were analyzed on the basis of the change of ranks and eigenvalue distribution of state matrices. The re-sults show that the ranks of the state matrices are mainly affected by the action of the spill control valve,the needle control valve,and the needle valve. In the pressure building stage,owing to the compression of the plunger a n d the propagation, reflection,and superposition of the pressure wave within the high pressure volume, the system is in the unsteady state. In the fuel injection stage,after the needle valve reaches maximum lift,the flow state of fuel oil remains steady. In addition,the reflection and superposition of the pressure wave recede owing to the opening of the orifice,and system stability is enhanced. In the end stage of fuel injection, system stability increases, which is mainly caused by the strong damping effect of fuel discharge and attenuation of the pressure wave.
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2017年第3期397-403,共7页
Journal of Harbin Engineering University
基金
国家自然科学基金项目(51279037
51379041)
黑龙江省留学归国人员科学基金项目(LC201422)
关键词
柴油机
电控
燃油喷射系统
线性分析
特征值
喷油控制
溢流控制阀
针阀控制阀
diesel engine
electronic control
fuel injection system
linear analysis
eigenvalues
spill control valve
needle control valve
fuel injection control
