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1、CENTRALSOUTHUNIVERSITY本科生毕业论文（设计）题目2.7T车用柴油机热力计算及高压共轨供油系统设计学生姓名指导教师学院专业班级完成时间年月日2.7T车用柴油机热力计算及高压共轨系统设计摘要：设计简要介绍了车用柴油机的组成，并详细进行了2.7T车用柴油机的参数及热力计算。采用四冲程，直列六缸，涡轮增压中冷，直喷燃烧室，压缩比为10.8。标准工况下，热计算和热平衡结果为有效功相当的热量占燃料总热量的48%。外特性参数结果为有效功率81.7kW,有效扭矩236.41N·m，。燃料有效油耗176.8g/kW·h。并且随着转速的提高油耗率先降低
2、后升高，在2000rpm时有最小值157.03g/kW·h，每小时耗油量和机械损失压力随着转速的提高而增加。而后进行了高压共轨供油系统设计，其中喷油泵采用的是用负荷弹簧和旋转轴凸轮使柱塞运动的滑阀式喷油泵。喷油器选择4孔长型喷油嘴,出油阀选择等容式出油阀，输油泵选择活塞式输油泵，与国内外主流车型相比，在燃油经济性方面具有较大优势，排放能达到欧III标准，零部件的设计加工比较容易，整车性能较稳定。理论结果表明，所设计的供油系统能够满足设计要求。关键词：车用柴油机；高压共轨；供油系统；喷油量2.7Tautomotivedieselenginethermody
3、namiccalculationandthehighpressurecommonrailsystemdesignAbstract:Thispaperintroducesthecompositionofvehicledieselenginebriefly,andmarchtheparameterandthermodynamiccalculationofthe2.7turboautomotivevehicledieselengineindetail,thesystemusefourcycle,straight-fourandturboChargingwith
4、Inter-cooling,Straightspraycombustionchamberengines,theratioofcompressionis.WhenStandardconditionstheparameterandthermodynamiccalculationresultiseffectiveworkconsiderableheataccountedfor47.2%ofthetotalfuelheat.Externalcharacteristicparameterresultsaretheeffectivepoweris80.4kW,eff
5、ectivetorqueis233N·m,effectivefuelconsumptionrateis179.6g/kW·h.Andastherotationalspeedincreasesfuelconsumptionfirstdecreasedandthenincreased,WhenRotationalspeedis2000rpm,hasminimumvalue158.35g/kW·h,Perhourfuelconsumptionandmechanicallossespressureincreasesastherotationalspeedincr
6、eases,thenthispaperdesignsofhighpressurecommonrailfuelinjectionsystem.TheinjectionpumpisSlide-valvefuelinjectionpumpwhichcausestheplungermovementbyusedLoadspringandtherotationaxisofthecam,whenStandardconditions,Injectorselect4-holelongstyle,Outletvalvechoiceconstantvolumetype,Oil
7、pumpchoicepistontype,whencompareswiththedomesticandforeignmainstreamvehicletypehasalargeadvantageinfueleconomy,andEmissionscanreachEuroIIIstandards,partseasytodesignandprocessing.Theentirevehicleperformanceisstable.Theoreticalresultsshowthatthedesignofthefuelsupplysystemcanmeetth
8、edesignrequirements.Keywords：Vehicledies
