无静态泄漏共轨喷油器性能分析及优化

The performance analysis and optimization of a common rail injector without static leakage

基于AMESim平台建立无静态泄漏共轨喷油器性能分析模型,以提高共轨喷油器喷油速率和降低喷油器高压燃油损失为目标,开展无静态泄漏共轨喷油器的研究,并与静态泄漏共轨喷油器进行对比分析。研究表明:结构参数相同时,无静态泄漏共轨喷油器的平均喷油速率和有效喷油量效率均比静态泄漏有所提高,但无静态泄漏喷油器的最高喷油速率处于整个喷油持续期的前中阶段。通过增大回油量孔直径,减小进油量孔直径、控制柱塞直径及针阀密封座面直径等优化设计,使最大喷油速率提高了18%,且喷油持续期中最高喷油速率后移了0.15 ms,在保持回油量基本不变的情况下,提高了喷油器的有效喷油量效率。

Based on the AMESim platform,the model of the common rail injector without static leakage is established.In order to improve the injection rate and reduce the high pressure fuel loss of the injector,the research of the common rail injector without static leakage is carried out.Compared with the static leakage common rail injector,the results show that the average fuel injection rate and the effective fuel injection efficiency of the new injector are higher than that of tradional injector when the structural parameters are the same.However,the maximum fuel injection rate of the injector without static leakage is in the middle and early stage of the whole fuel injection duration.By increasing the oil return hole,reducing the diameter of the feed hole,controlling the diameter of the plunger and the diameter of the sealing seat of the needle valve,the maximum fuel injection rate is increased by 18%,and the maximum fuel injection rate is moved back 0.15 ms,while the return oil quantity is basically unchanged,the effective fuel injection efficiency of the injector is improved.