摘要
超高压共轨系统能够通过控制增压时序与喷油时序之间的关系,实现可调喷油规律喷射,进而影响柴油机喷油特性。为探明超高压共轨系统喷油特性随增压脉宽的影响规律和成因机理,在介绍系统数学模型的基础上,建立了超高压共轨系统的仿真模型,并利用性能试验验证了模型的准确性,分析了在不同共轨压力下,增压脉宽对超高压共轨系统喷油特性的影响。结果表明:在小喷油脉宽条件下,随着增压脉宽的增加,喷油速率曲线形态近似于靴形,且保持不变。同时,喷油特性参数随增压脉宽的改变均保持不变,只是随着共轨压力的变化而发生变化。在大喷油脉宽条件下,随着增压脉宽的增加,喷油速率可能会出现类似于“倒靴形”的曲线形态。
Ultra high pressure common rail system can realize adjustable fuel injection rate by controlling the rela-tionship between pressurization timing and fuel injection timing,and then affect the fuel injection characteristics of diesel engine.In order to ascertain the effect law and its formation mechanism of the pressurization pulse width on the fuel injection characteristics of ultra high pressure common rail system,on the basis of introducing the mathematical model of the system,the simulation model of ultra high pressure common rail system was established,the accuracy of the model was verified by performance experiment,and the effects of pressurization pulse width on the fuel injection characteristics of the system under different common rail pressure were analyzed.The results show that under the con-dition of small injection pulse width,with the increase of pressurization pulse width,the shape of fuel injection rate curve is similar to saddle shape and remains unchanged;At the same time,the fuel injection characteristic parame-ters remain unchanged with the change of pressurization pulse width,but change with the change of common rail pres-sure.Under the condition of large injection pulse width,with the increase of the pressurization pulse width,the fuel injection rate curve shape may appear similar to the“inverted saddle-shaped”.
作者
周磊
杨昆
赵建华
聂涛
ZHOU Lei;YANG Kun;ZHAO Jian-hua;NIE Tao(College of Power Engineering,Naval University of Engineering,Wuhan Hubei 430033,China)
出处
《计算机仿真》
北大核心
2023年第5期32-36,207,共6页
Computer Simulation
基金
国家自然科学基金(51379212)
海军工程大学自主立项基金(425317S022,425317S023)。
关键词
超高压共轨系统
喷油特性
增压脉宽
Ultra high pressure common rail system
Fuel injection characteristics
Pressurization pulse width
