换气相位对涡轮增压汽油机爆震的影响.pdf

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1、第52卷V01．52第10期No．10农业装备与车辆工程AGRICULTURALEQUIPMENT&VEHICLEENGINEERING2014年10月0ctober2014doi：10．3969d．issn．1673—3142．2014．10．003换气相位对涡轮增压汽油机爆震的影响祖英利1，胡宗杰2，李理光2(1．201209上海市上海第二工业大学；2．201804上海市同济大学汽车学院)[摘要]针对小型化增压发动机急需解决的爆震和早燃问题，在一台2．0L涡轮增压直喷汽油机上，对中等负荷进排气相位及大负荷进排气相位对发动机爆震的影响进

2、行了实验研究，介绍了实验装置及研究方法，并得出结论，为改善小型化高压缩比增压直喷汽油机的性能提供参考。[关键词]直喷汽油机；爆震；进排气相位；重叠角；扫气[中图分类-号-]U469．72[文献标志码]A[文章编号]1673—3142(2014)10—0010—05TheCamTimingEffectsonKnockPerformancewithaTurboChargerGasolineEngineZuYinglil，HuZongjie2，LiLiguan92(1．SecondPolytechnicUniversity，Shanghai20

3、1209，China；2．CollegeofAutomotiveStudies，TongjiUniversity，Shanghai201804，China．)[Abstract]Basedona2．0LSIDIturbochargergasolineengine，theknockpedbmlancewasstudiedatdifterentenginespeedsandloads．Thetestresultsshowthat：whenintakecanlphasingwasretarded，theknockperfbmlancewasim

4、provedduetotheloweftectivecompressionratio，independenceofenginespeedsandloads．Withthefurtherretardingofintakecanlphasing，thehotin—cylinderairwaspushedbackintointakemanifoldwiththelateintakevalveclosing．Itwillreducetheknockperfomlanceimprovenmntbyloweftectivecompressionrat

5、io．Fordifterentengineloads，theincreasingvalveoverlapwillMtecttheinternalresiduallevelandtheknockperfommnce．Atmiddleload，theinletairpressureislowerthantheexhaustairpressure．Theincreasingvalveoverlapwillincreasetheinternalresiduallevel，whichnlaketheknockperfommnceworse．Atlo

6、wenginespeedandhighload，theinletairpressureishigherthanexhaustpressureforturbochargerengine．Thepositiveairscavengingreducetheinternalresiduallevelwhichimprovetheknockperfommnce．Themixturetemperatureattheendofcompressionatteettheengineknocksignificantly．Whentheinter—cooler

7、outlettemperaturechangedfi'OIn30。Cto80。C．thecon'esponding50％inaSSbumdurationcrankangleatknocklimitation(CA50)wasretardedby6。CA．Forlowspeedandhighload，retardingtheintakecanlphasingorincreasingvalveoverlapwillimproveknockperfommnce．However，therequirementofboostpressureratio

8、ishighforretardingintakecanlphasing．Anlinorboostratioisrequiredforhighvalveoverlap．[Keywords]SID