四缸增压中冷柴油机配气机构优化设计与试验研究

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1、万方数据四缸增压中冷柴油机配气机构优化设计与试验研究改善。关键词：柴油机，配气机构，凸轮型线，配气相位，仿真优化，试验II万方数据江苏大学硕士学位论文ABST队CTValvetrainisoneofthemostmainpartsinanengine．Itaffectsengine’Seconomicperformance，workingreliabilityandemissionsperformance，etc．Higherdemandisputforwardtovalvetraininmodemenginesduetothedevelopmentofreliably

2、,steadily,lowemissions，lowfuelconsumptionandhighspeed．Thecamprofiledesignisacorepartofoptimumdesigninvalvetrain．Thekeyishowtochoosethecorrecttypeandparametersofcamprofilebasedontheperformanceandapplicationoftheengine．Inthispaper,thevalvetrainofafour-cylinderintercooleddieselenginewithtur

3、bochargerisoptimizedandimprovedbysimulationandexperiment．Firstly,thekinematicsanddynamicsmodelsofthevalvetrainareestablishedbasedontheapplicationofintakesystemsoftware．Throughkinematicsanddynamicssimulation，itisfoundthatthechangeofaccelerationperunitofcamangleofintakevalveisrelativelylar

4、ge．Duringtheopenandclosureoftheintakevalve，thereisbigchangeinacceleration．Theimpactforceoftheintakevalveduringcloseisrelativelylarge．Itiseasytomaketheintakevalvevibrateandthevalveseatsearlywear．AnewintakeCamprofileisdesignedbythemethodofPOLYDYNEtosolvetheproblemsofthedieselengine．Secondl

5、y,theworkingmodeloftheengineisestablishedbasedonthesoftwareBoostandisvalidatedbytheexperiment．Theoptimizedvalvetimingiscarriedoutbysimulation。Theeffectsofintakevalvelateclosureangle，exhaustvalveadvanceopenangle，valvesoverlapangleonengineperformanceareanalyzed．Thevariationsoffueleconomyan

6、denginepowerperformancewiththechangingofvalvetimingunderdifferentoperationconditionsareanalyzed．Theengine’Sbestvalvetimingisdetermined．Theresultsshowthattheoptimizedcamprofileandvalvetimingcouldreducepumpingloss，increasevolumetricefficiencyandenginepowerunderdifferentoperationconditions．

7、Finally,theoptimizeddesignintakecamshaftismanufactured．Itiscomparedwiththeoriginalintakecamshaftintestbench．Theresultsshowthattheengine1II万方数据四缸增压中冷柴油机配气机构优化设计与试验研究performancesarenearlythesameunderlowspeedaftertheintakecamshaftimprovement．Inmediumandhighspeed，thepowerisin