EVCT对直喷汽油机燃烧和微粒排放的影响  

EVCT on Combustion and Particulate Emission of Direct Injection Gasoline Engine

作　　者：解方喜[1] 孟祥龙 刘宇[1] 李晓娜[1] 张玉林 冯海洲 Xie Fangxi;Meng Xianglong;Liu Yu;Li Xiaona;Zhang Yulin;Feng Haizhou(Jilin University,State Key Laboratory of Automotive Simulation and Control,Changchun 130022;Planning&Marketing Department of FAW Foundry Co.,Ltd.,Changchun 130062)

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130022 [2]一汽铸造有限公司规划与市场部,长春130062

出　　处：《汽车工程》2022年第5期701-708,共8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);吉林省教育厅科学技术研究项目(JJKH20211086KJ)资助。

摘　　要：本文研究了排气门关闭正时(EVCT)耦合点火正时(IT)对火花点火汽油直喷(GDI)发动机在5种不同工况下燃烧、性能和微粒排放的影响。研究结果表明,EVCT的延迟导致燃烧持续期(CA5-CA90)延长和燃烧中心(CA50)延迟。而IT的提前可以提前CA50,缩短燃烧持续期。EVCT结合IT可有效改善发动机油耗和微粒排放,有效燃油消耗率(BSFC)可降低4.66%,微粒总数最多可减少95%。随着负荷或转速的增加,EVCT对微粒排放和燃料消耗的影响减弱。This paper studies the effect of exhaust valve closing timing(EVCT)coupled with ignition timing(IT)on combustion,performance and particulate emissions of spark-ignited gasoline direct injection(GDI)engines under five different operating conditions. The results of the study show that the delay of EVCT leads to prolonged combustion duration(CA5-CA90)and delayed combustion center(CA50). The advancement of IT can advance CA50 and shorten the combustion duration. EVCT combined with IT can effectively reduce engine fuel consumption and particulate emission,with a reduction of brake specific fuel consumption(BSFC)by 4.66% and the total number of particulates by up to 95%. With the increase of the load or speed,the impact of EVCT on particulate emissions and fuel consumption weakens.

关 键 词：直喷汽油机 可变气门正时 点火提前角 微粒 发动机性能 

分 类 号：U464.171[机械工程—车辆工程]