LP-EGR和电增压协同技术对汽油机性能的影响  

Effects of LP-EGR and Electric Charger Synergy on Performance of Gasoline Direct Injection Engine

作　　者：韩敬贤 黄昭明 王利 陈伟国[4] 潘金元[4] HAN Jingxian;HUANG Zhaoming;WANG Li;CHEN Weiguo;PAN Jinyuan(Department of Mechanical and Electrical Engineering,Anhui Vocational College of Grain Engineering,Hefei 230013,China;School of Mechanical Engineering,Wanjiang University of Technology,Maanshan 243031,Anhui,China;School of Mechanical and Electrical Engineering,Xuancheng Vocational and Technical College,Xuancheng 242000,Anhui,China;Engine Engineering Research Institute,Chery Automobile Co.,Ltd.,Wuhu 241006,Anhui,China)

机构地区：[1]安徽粮食工程职业学院机电工程系,合肥230013 [2]皖江工学院机械工程学院,安徽马鞍山243031 [3]宣城职业技术学院机电与汽车学院,安徽宣城242000 [4]奇瑞汽车股份有限公司发动机工程研究院,安徽芜湖241006

出　　处：《机械科学与技术》2022年第1期82-87,共6页Mechanical Science and Technology for Aerospace Engineering

基　　金：国家自然科学基金项目(51806143);安徽省高校自然科学研究项目(KJ2020A0837,KJ2020A1141)。

摘　　要：在一款采用废气涡轮增压的直喷汽油机上,进行了电动增压器和低压废气再循环(Low pressure exhaust gas recirculation,LP-EGR)技术组合对发动机经济性、NO_(x)排放特性以及动力性、EGR率瞬态响应特性影响的试验研究。结果表明:电增压工作时,低速外特性EGR率可达到25%,使得1250~2000 r/min外特性的燃烧相位提前,油耗相对于电增压不工作时下降8.5%~10%,同时NO_(x)排放显著降低;而在部分负荷工况下,电增压的泵吸作用使得最大EGR率大于30%,取得了油耗和NO_(x)排放同时改善的综合效果,且最高油耗下降率可达10.8%;此外电增压工作时,1500 r/min下负荷从0.2 MPa增大到1.5 MPa的瞬态响应时间缩短2/3;当发动机定转速加大负荷运行时,电增压工作时进气歧管目标EGR率的建立时间可缩短1.3 s,有效优化了发动机加速过程的运转控制参数。In this paper,an electric supercharger was installed on a GDI gasoline engine with LP-EGR system.The engine performance and emission changes were experimentally investigated by combining the electric supercharger technology and EGR.Meanwhile,the transient responses of dynamic and EGR rate also were discussed.The results show that the EGR rate could reach 25%at WOT and low speed with electric charger working.That led to the optimization of combustion phase at 1250~2000 r/min.The fuel consumption declined by 8.5%~10%,and NO_(x) emission also lowered observably.And at partial load,the maximum EGR rate were higher than 30%with the pumping effect of electric charger.That caused fuel consumption and NO_(x) emission simultaneously improve,and the maximum decreasing rate of fuel consumption could be 10.8%.In addition,with electric charger working,the transient response time would be contracted by 2/3 from 0.2 MPa to 1.5 MPa at 1500 r/min.When engine was accelerated working,the built-up time of EGR rate in intake manifold could contracted 1.3 s with electric charger working.

关 键 词：电动增压器 LP-EGR 油耗率 NO_(x)排放 瞬态响应特性 

分 类 号：TK421.5[动力工程及工程热物理—动力机械及工程]