摘要
针对高压共轨喷射系统在仿真软件中建立喷油器和发动机的耦合模型。在台架试验验证了模型可信性的前提下,对喷射系统进行变参数研究,并分析各个参数对喷油规律和发动机性能的影响。研究结果表明:液压控制容积的大小及控制容积进回油孔径的大小会影响喷油器开启和关闭过程中的喷油速率;电磁阀铁芯质量超过10g时针阀落座明显延后;弹簧预紧力由50N增加到100N时,喷油器的初期喷射速率降低了35%左右,喷射时刻也滞后约2～3°CA;磁场力由70N增加到130N时,初期放热速率增加2倍左右,喷射时刻也提前约2°CA;喷孔的孔数和孔径存在最佳匹配关系,匹配的效果直接影响到喷孔的流量系数,从而影响发动机的性能。
A coupling model of fuel injector and engine for high pressure common rail fuel injection system was established by using simulation software and validated by bench test.Varying parameter research on the injection system was conducted to analyze effects of each parameter on fuel injection rate and engine performance.The results indicate that the size of hydraulic control volume and oil enter and return hole diameters would affect the injection rate of injector in its opening and closing processes.When the iron core mass is greater than 10 g,the needle valve seating timing obviously lags.When the preload of needle valve spring increases from 50 N to 100 N,the initial injection rate reduces by 35% and the injection timing lags about 2～3 °CA.When electromagnetic force increases from 70N to 130N,initial heat release rate doubles and the injection timing is about 2 °CA ahead.There is a best matching relation between the nozzle hole number and diameter,the matching has a direct impact on discharge coefficient of the nozzle hole,thus affecting engine performance.
出处
《内燃机工程》
EI
CAS
CSCD
北大核心
2012年第2期11-19,共9页
Chinese Internal Combustion Engine Engineering
基金
国家"八六三"高技术研究发展计划--汽车开发先进技术资助项目(2008AA110101)
关键词
内燃机
高压共轨柴油机
仿真
喷射系统
性能
IC engine
high pressure common rail diesel engine
simulation
fuel injection system
performance
