基于VNT的高压EGR系统对重型柴油机性能的影响  

Influence of VNT High Pressure EGR System on Heavy-duty Diesel Engine Performance

作　　者：胡志远[1] 宋浩[1] 李金[1] 谭丕强[1] 楼狄明[1] 

机构地区：[1]同济大学汽车学院,上海201804

出　　处：《车用发动机》2014年第2期68-74,共7页Vehicle Engine

基　　金：国家"863"项目(2012AA111706)

摘　　要：以1台6缸高压共轨重型柴油机为样机,利用AVL Boost建立了基于VNT的高压EGR模型,分析了ESC十三工况下EGR率对发动机性能和排放的影响。结果表明:基于VNT的高压EGR系统可以改善柴油机低转速、高负荷工况区域的NOx排放,当发动机转速增加时,EGR率对发动机性能影响的程度增大。合适的EGR率可以在大幅减少重型柴油机NOx排放的同时小幅度改善其动力性和经济性。Based on a 6-cylinder heavy-duty high pressure common rail diesel engine,the model of high pressure EGR system was established with AVL Boost software and the influences of EGR rate on engine performance and emission in European steady-state cycle（ESC）were analyzed.The results show that the high pressure EGR system based on variable nozzle turbocharger（VNT）can improve NOxemissions in low-speed and high-load conditions.With the increase of engine speed,the influence of EGR rate on engine performance increases.The appropriate EGR rate can not only reduce the NOxemission obviously, but also improve the engine power and economy performance to some extent.

关 键 词：重型柴油机 可变喷嘴涡轮增压器 废气再循环 仿真 

分 类 号：TK421.2[动力工程及工程热物理—动力机械及工程]