气门重叠角对GDI发动机性能和微粒排放的影响  

Influence of Valve Overlap Angle on GDI Engine Performance and Particulate Emission

作　　者：李晓娜[1] 解方喜[1] 窦慧莉 刘江唯 刘宇[1] Li Xiaona;Xie Fangxi;Dou Huili;Liu Jiangwei;Liu Yu(Jilin University,State Key Laboratory of Automobile Simulation and Control,Changchun 130025;China FAW Co.,Ltd.R&D Center,Changchun 130011)

机构地区：[1]吉林大学,汽车仿真与控制国家重点实验室,长春130025 [2]中国第一汽车股份有限公司技术中心,长春130011

出　　处：《汽车工程》2023年第4期654-662,共9页Automotive Engineering

基　　金：国家自然科学基金(51876079);吉林省科技发展计划项目(20200403150SF);动力机械与工程教育部重点实验室开放课题资助。

摘　　要：本文中研究了可变进气正时(IVT)、可变排气正时(EVT)和可变进排气正时策略(IEVT)形成的气门重叠角对缸内直喷汽油机燃烧和微粒排放的影响。研究发现在小负荷下3种正时策略中正气门重叠角的增加均会导致缸内残余废气量增加,滞燃期和燃烧持续期推迟和延长,油耗和HC排放均先减小后增加,NO_(x)排放减小。在相同气门重叠角下,EVT的残余废气量最多,IVT对泵气损失改善最大达15.6%。相比IVT和EVT,IEVT在60°CA的重叠角仍稳定燃烧且减少了传热损失和排气损失,油耗可降低8.67%,NO_(x)减少了96.57%,微粒总数减少了89.43%。In this paper,the influence of valve overlap angle formed by variable intake timing(IVT),variable exhaust timing(EVT)and variable intake and exhaust timing strategy(IEVT)on combustion and particulate emission of the direct injection gasoline engine is studied.It is found that the increase of positive valve overlap angle under the three timing strategies under low load will lead to the increase of residual exhaust gas in the cylinder,prolonged ignition delay and increased combustion duration,and reduce fuel consumption and HC emissions at first and then increase,and reduce NO_(x)emission.At the same valve overlap angle,EVT has the largest amount of residual exhaust gas,while IVT can improve the pumping loss by 15.6%.Compared with IVT and EVT,IEVT still burns stably at the overlapping angle of 60°CA and reduces heat transfer loss and exhaust loss,with reduction offuel consumption by 8.67%,reduction of NO_(x)by 96.57%,and reduction of the total number of particles by 89.43%.

关 键 词：气门重叠角 气门正时 直喷汽油机 发动机性能 微粒排放 

分 类 号：U467.48[机械工程—车辆工程] U464.134.3[交通运输工程—载运工具运用工程]