油箱系统简介 simple.ppt

油箱系统简介 Fuel Venting System Introduction内容安排/Agenda油箱系统的功能1.Fuel System Function 排气过程介绍2.Venting Process Introduction 简介3.OBD OBD Introduction加油燃油储存呼吸噪音保护/安装安全燃油输送燃油箱系统燃油箱的基本功能1.2.排气过程简介Filling of the fueltankvapour outfuel in加油过程 2.1Filling of the fueltank油蒸汽油蒸汽会进入大气燃油Filling of the fueltank油蒸汽无法通过加油直到燃油液位没过循 环管，使加油枪跳枪，即 加油结束压力上升Filling of the fueltankVapourVapor is released in the environnement !!!Fuel in在美国不允许，油蒸汽必须进入发动机燃烧FillingVapour碳罐FLVVPurgeairFuel inFLVV =Fill Limit Vent ValveORVR =On Board Vapour RecoveryFilingcarboncanisterFLVVPurgeairFuel inFLVV = locks off.Pressure build-up.Fuel goes up into fillerpipe.Filling gun shuts off.Fuelvapors are stored into the carbon cannister DrivingPomp moduleFuel from and to engineTemperature risesIf fuel goes out tank, air must go in !!供油过程 2.2DrivingPomp moduleTemperature risesCar stops. Temperature is high,Pressure build-up in the tankDrivingPomp moduleSolution = Roll Over Valve (ROV)CanistervapourAirDriving Why just not a nipple with filter ?Crash ?ROV shuts-off.CannisterFuelFuel.3.OBD 简介•OBD = 车载自动诊断系统•在一系列汽车自动测试中必须满足汽车排放法规的要求 •How ? – 欧洲 = 满足要求但不必自动检测 – 美国 =满足要求但必须自动检测 – China = 将要实行OBD碳罐air valvePurge valve是油箱内部位负压密闭油箱和阀门经过一段时间检测油箱内部的压力变化如果有变化说明有泄漏OBDcarboncanisterLDP leak detection pumpPurge valve与负压相似，只不过油箱内建立的为正压Thank you for your time!! Any Question?谢谢！。