重型卡车SCR排放系统-中英文版-2015-10

EngineApplicationDepartmentofC&CTrucksCo.,Ltd.ResearchInstitute陶兵文2015年10月TaoBingwenOctober,20150第一部分概述Chapter1Overview第二部分系统构造与原理Chapter2SystemConstruction&OperatingPrinciple第三部分主要部件功用及工作原理Chapter3FunctionsandOperatingPrincipleofMainComponents第四部分使用注意事项Chapter4Useattention第五部分故障诊断及排除Chapter5FaultDiagnosisAndTroubleshooting1目录Contents•1、排气后处理系统的功用：FunctionsofExhaustSolutionSystem:•①保证发动机最佳性能的同时，把发动机所有燃烧废气安全地运离发动机；•①Toensurethebestperformanceoftheengine，combustionexhaustgasdeliveredtotheenginesafelyatthesametime；•②消减发动机产生的排气噪声以满足法规和客户对噪音要求；•②Reduceexhaustnoisegeneratedbytheenginetomeettherequirementsofregulationsandcustomers•③降低或消除发动机燃烧产生的污染物以满足法规和客户要求；•③Reduceoreliminatethepollutantsgeneratedbyenginecombustioninordertomeetregulationsandcustomerrequirements;•2、排气后处理系统的技术类型：TypesofExhaustSolutionSystem:•①选择催化还原技术•简介：选择性催化还原是一项针对柴油发动机排气的NOx控制技术。这个反应需要在一个催化器里向排气中喷入尿素（一种易于分解为氨的氮化合物）。尿素被加热后产生的氨与NOx发生发应，生成无害的氮气(N2)和水(H20)。•①SCR：SelectiveCatalyticReduction•Introduction:SelectivecatalyticreductionisaNOxcontroltechniquefordieselengineexhaust.TheprocessinvolvestheinjectionofUrea(anitrogenouscompoundwhichreadilydecomposesintoammonia)intotheexhaustoveracatalystconvertor.TheammoniareactswithNOxandproducesharmlessnitrogen(N2)andwater(H20).2一、概述Chapter1Overview注意：这里所说的添蓝就是指：“尿素”Note:TheAdbluesaidhereis:urea•3、排气后处理系统的组成：ComponentsofExhaustSolutionSystem:•①添蓝供给装置：如添蓝罐、添蓝溶液传感器、添蓝管路、添蓝喷射泵等•①Adbluesupplydevice:suchasadbluetank、adbluesensor、adbluehose•②空气供给装置：如储气罐、油气分离器、尼龙管等•②Airsupplydevice:suchasairtank、oil&airfilter、PAhose•③系统加热装置：如防冻液电磁阀、EPDM管路、添蓝溶液传感器等•③Systemheatingdevice:suchascoolantcontrolvalve、EPDMhoseandadbluesensor•④排气催化还原装置：如催化消声器、排气管等•④Exhaustcatalyticreductiondevice:suchasexhasutgasprocessor、exhaustpipe•⑤系统控制装置：如DCU、NOx传感器、前温度传感器、后温度传感器等•⑤Systemcontroldevice:suchasDCU、NOxsensor、catalystinputtemperaturesensor、catalystoutputtemperaturesensor3一、概述Chapter1Overview4、SCR后处理系统关键总成件：KeyassemblyofSCRsystem:催化消声器Exhaustgasprocessor添蓝喷嘴Ureainjectornozzle喷嘴扣压螺母Nozzlenut添蓝喷射泵UreadoserUnit防冻液电磁阀Coolantcontrolvalve油气分离器Oil&airfilter排气管Exhaustpipe添蓝罐带添蓝溶液传感器Ureatankwhitureasensor添蓝管路Ureahoses氮氧传感器NOxsensorSCR控制模块Dosingcontrolunit前温度传感器CatalystinputT-sensor后温度传感器CatalystoutputT-sensor第一部分概述Chapter1Overview第二部分系统构造与原理Chapter2SystemConstruction&OperatingPrinciple第三部分主要部件功用及工作原理Chapter3FunctionsandOperatingPrincipleofMainComponents第四部分使用注意事项Chapter4Useattention第五部分故障诊断及排除Chapter5FaultDiagnosisAndTroubleshooting4目录Contents二、排气后处理系统—构造Chapter2、ExhaustSolutionSystem—construction添蓝供给装置Adbluesupplydevice空气供给装置Airsupplydevice系统控制装置Systemcontroldevice排气装置Exhaustcatalyticreductiondevice系统加热装置systemheatingdevice发动机Engine电源线Powerlines信号线signallines加热管Heatlines添蓝管Adbluelines空气管AirlinesCAN线CANlines8车辆储气罐9油气分离器10进气管11出气管22NOx传感器催化器Catalyticconverter17排气管18催化消声器（EGP）发动机废气流向箭头Exhaustflowarrow19排气尾管1.Ureatank2.UreadoserUnit3.Ureainjectornozzle4.Ureasupplyhose5.Ureareturnhose6.Ureapressurehose7.Ureasensor添蓝供给装置Adbluesupplydevice26蓄电池＋－空气供给装置Airupplydevice8.Airtank9.Oil&airfilter10.Airinhose11.Airouthose化冰解冻装置Icethawingdevice12.Engine13.Coolantcontrolvalve14.Coolantinhose15.Coolantouthose16.Coolantreturnhose7.Ureasensor排气催化还原装置ExhaustCatalyticreductiondevice17.Exhaustpipe18.ExhaustGasprocessor19.Exhausttailpipe系统控制装置Systemcontroldevice20.CatalystinputT-sensor21.CatalystoutputT-sensor22.NOxsensor23.Dosingcontrolunit24.Enginecontrolunit25.Heatingrelay26.Battery27.Ignitionswitch23DCU24ECU21后温传感器20前温传感器3添蓝喷嘴1添蓝罐2添蓝喷射泵4进液管5回液管6喷射管7添蓝传感器14进水管15出水管12发动机13防冻液电磁阀16加热回水管25加热继电器27.点火开关二、排气后处理系统—构造Chapter2、ExhaustSolutionSystem—construction系统工作原理：简单地说，系统的工作原理如下：AdBlue存放在一个安装在底盘上的罐中。此罐向计量泵(DU)供应溶液，后者也安装在底盘上。DU由SCR控制模块（DCU），DCU和发动机控制模块(ECM)关联通讯。DU使用来自车辆系统的压缩空气使AdBlue雾化，并通过非常精确的计量和泵送系统输送到发动机排气系统内的喷嘴。DCU控制着喷入排气中的AdBlue数量，在任何指定转速和负载条件下，将其与发动机的NOx排放量相匹配。与炽热的排气一接触，水就迅速蒸发，尿素变成氨。氨与NOx在催化转换器内发生发应，这一过程的结果就是从排气管中排放出无害的氮气(N2)和水(H20)。Systemworkprinciple：Brieflydescribed,thesystemfunctionsasfollows:TheAdBlueisstoredinachassismountedtank.ThetanksuppliesthesolutiontoaDosingUnit(DU)whichisalsochassismounted.TheDUiselectronicallycontrolledbytheUosingcontrolunit（DCU）whichrelatestotheenginecontrolmodule(ECM).TheDUusescompressedairsuppliedfromthevehiclesystemtoatomizetheAdBlueandbymeansofaveryaccuratepumpingandmeteringsystem,suppliesaspraynozzleintheengine’sexhaustsystem.TheamountofAdBlueinjectedintotheexhaustiscontrolledbytheDCUandmatchedtotheNOxoutputoftheengineatanygivenspeedandloadcondition.Waterevaporatesquicklyandtheureaturnsintoammoniawhenincontactwithhotexhaustgases.TheammoniareactswithNOxoverthecatalystconvertorandtheresultanttailpipeemissionfromthisprocessisharmlessnitrogen(N2)andwater(H20).二、排气后处理系统—构造Chapter2、ExhaustSolutionSystem—construction二、排气后处理系统原理&构造—添蓝供给装置Chapter2、Principle&construction—Adbluesupplydevice添蓝罐Adbluetank添蓝溶液传感器Adbluesensor添蓝进液管Adbluesupplyhose添蓝回液管Adbluereturnhose添蓝喷射管AdbluePressurehose添蓝喷射泵AdbluedoserUnit原理图Principlefigure3添蓝喷嘴1添蓝罐2添蓝喷射泵4进液管5回液管6喷射管7添蓝传感器1.Ureatank2.Ureadoserunit3.Ureainjectornozzle4.Ureasupplyhose5.Ureareturnhos