电喷发动机故障引起的汽车动力不足机理分析毕业论文

摘要社会进入了信息网络时代，人们对汽车的要求不再满足于一种代步工具，更希望汽车是生活及工作范围的一种延伸，在汽车上就像在自己的办公室和家里一样工作和生活。而发动机是汽车行驶系统的重要组成部分，它的性能优劣将直接影响汽车的动力、平顺性、安全性、稳定性等。电喷发动机，即“EFIengine”，电喷发动机是采用电子控制装置，取代传统的机械系统(如化油器)来控制发动机的供油过程。如汽油机电喷系统就是通过各种传感器将发动机的温度、空燃比油门状况、发动机的转速、负荷、曲轴位置、车辆行驶状况等信号输入电子控制装置，电子控制装置根据这些信号参数．计算并控制发动机各气缸所需要的喷油量和喷油时刻，将汽油在一定压力下通过喷油器喷入到进入气管中雾化。并与进入的空气气流混合，进入燃烧室燃烧．从而确保发动机和催化转化器始终工作在最佳状态。这种由电子系统控制将燃料由喷油器喷入发动机进气系统中的发动机称为电喷发动机。本文首先在绪论介绍了电喷发动机对汽车动力性的课题背景及研究意义，第二章介绍电喷发动机的结构和工作原理，指出电喷发动机的重要性.第三章直接检测电喷发动机所引起汽车动力不足，介绍了各种检查发动机部件的方法如检查油路情况，检查发动机零件情况，检查发动机内传感器，检查发动机电路情况等。四、五章着重描述了论文的主题：电喷发动机引起汽车动力不足机理分析，最后阐述了未来电喷发动机的发展趋势。关键词：电喷发动机,EFIengine，汽车动力性,电喷发动机检测专科生毕业设计（论文）IIAbstractSocietyintotheinformationnetworkera,therequirementsofthevehiclenolongerbesatisfiedwithameansoftransport,butalsowanttoliveandworkcarisanextensionofthescope,inthecarlikeintheirownofficeandhomeworkandlife.Andtheengineistheautomobiletravelsystemimportantconstituent,itsperformancewilldirectlyaffectthecar'spower,ridecomfort,security,stability.Electricfuleinjectionengine,thatEFIengine,ElectronicFuelInjectionengineelectroniccontrolunitisusedtoreplacethetraditionalmechanicalsystems(suchasthecarburetor)engineoiltocontroltheprocess.SuchasElectronicFuelInjectionSystemisthroughavarietyofsensorstotheenginetemperature,throttlepositionair-fuelratio,enginespeed,load,crankshaftposition,vehicledrivingconditionssuchassignalinputelectroniccontroldevices,electroniccontroldeviceparametersbasedonthesesignals.Calculationandcontrolofenginecylinderfuelinjectionquantityandtherequiredinjectiontime,underacertainpressuregasolineinjectorspraythroughintothetracheaintothespray.Andmixedwithincomingairflowtoenterthecombustionchamber.Toensurethattheengineandcatalyticconverterworkinginoptimalcondition.ControlledbytheelectronicsystemthatwillfueltheenginebytheinjectorssprayintotheintakesystemoftheenginecalledtheEFIengine.ThispaperdescribestheintroductionofElectronicFuelInjectionengineonthevehicledynamicresearchbackgroundandsignificanceofthesubject,thesecondchapterdescribesthestructureofEFIengineandprinciple,thattheimportanceofEFIengine.ChapterIIIcausedbythedirectdetectionofEFIenginevehiclepower,introducesavarietyofinspectionmethodssuchascheckingtheengineoilcircuitcomponents,inspectengineparts,inspecttheenginesensors,checkenginecircuitandsoon.Four,fivechaptersfocusondescribingthethesistopic:EFIenginepowershortagecausedbythemechanismofcar,andfinallysetthefuturetrendofEFIengine.Keywords:Electricfuleinjectionengine,EFIengine,autopower,EFIenginetest.专科生毕业设计（论文）1目录第1章绪论..............................................................11.1课题背景及问题提出................................................................................................11.2研究目的与意义........................................................................................................1第2章电喷发动机的结构和工作原理........................................32.1电喷发动机的工作原理..........................................................................................32.2电喷发动机的类型与结构......................................................................................42.2.1发动机的分类.....................................................................................................................42.2.2电喷发动机的分类.............................................................................................................62.2.3发动机的基本构造.............................................................................................................72.2.4电喷发动机的传感器.........................................................................................................82.3电喷发动机的优点.................................................................................................12第3章检测电喷发动机方法...............................................143.1检测电喷发动机......................................................................................................143.1.1检测电喷发动机故障诊断基本程序...............................................................................143.1.2检测电喷发动机故障诊断的基本方法...........................................................................153.1.3检测电喷发动常见故障及些可能发生的故障原因........................................................183.2检测故障诊断与维修实例分析..............................................................................18第4章由电喷发动机故障引起的汽车动力不足机理分析.......................214.1由燃油喷射系统故障引起的汽车动力不足机理分析..........................................214.1.1空气供给系统故障引起的汽车动力不足机理分析........................................................214.1.2燃油供给系统故障引起的汽车动力不足机理分析.......................................................234.1.3燃油系统故障诊断流程图...............................................................................................284.2由点火控制系统故障引起的汽车动力不足机理分析..........................................294.2.1点火系统工作原理...........................................................................................................294.2.2由传感器故障引起的汽车动力不足机理分析................................................................30专科生毕业设计（论文）24.2.3点火控制器和执行器故障引起的汽车动力不足机理分析...........................................364.2.4点火系统故障诊断流程图.............