增压式电控喷油器仿真分析

Simulation Analysis of Booster Electronic Control Injectors

基于AMEsim软件建立了增压式电控喷油器仿真模型,在对模型进行试验验证的基础上,仿真分析了喷油器的关键参数,如控制腔容积、进出油孔孔径和针阀弹簧预紧力对喷油速率和针阀升程的影响规律。结果表明:当控制腔容积较小时,针阀落座快,但轨压波动大,喷射压力不稳定,当控制腔容积较大时,针阀反应速度下降,导致落座延后;进出油孔孔径主要影响喷油起始和结束阶段的喷油率和针阀升程;在保证针阀正时开启和足够喷油量的情况下,针阀弹簧预紧力应取较大值。

Based on AMEsim software, a simulation model of booster electronic injector was established. The model was verified by test and used to analyze the influence of key parameters of injector, such as control chamber volume, inlet and outlet oil hole diameter and needle valve spring preload on injection rate and needle valve lift. The results show that when the volume of the control chamber is small, the needle valve seat quickly, but the rail pressure fluctuates greatly and the injection pressure is unstable; when the volume of the control chamber is large, the response rate of needle valve declines and seat slow- ly; the diameter of the oil inlet and oil outlet mainly affect the injection rate and the needle valve lift at the beginning and the end of the fuel injection; the needle valve spring preload should be set at a rela- tively large value, with the precondition of ensuring the needle valve lift timing and the fuel injection amount is enough.