摘要随着中国汽车工业的不断发展，商用车市场份额不断增加，柴油机作为商用车主要动力来源的需求不断增加。柴油发动机的废气排放，不管是否引起烟雾和光化学烟雾污染。美国和欧洲已经开始研究柴油机废气排放和治理，执行非常严格的排放法规，目前国内外排放的柴油机排放主要是EGR和SCR技术路线。然而，EGR管道将增加燃料消耗对燃料中的硫更敏感，国内燃料质量仍有待进一步提高。良好的燃油经济性，SCR线柴油机体变化小，对硫磺不敏感，技术升级连续性好，所以国内重型柴油机厂家满足未来排放的六项研究已被用于欧洲的SCR路线。关键词：国6标准；柴油机；排放技术AbstractWiththecontinuousdevelopmentofChina'sautomobileindustryandgrowthofcommercialvehiclemarketshareisrisinggradually,thedieselengineasthemainpowersourceofcommercialvehicles,thedemandisalsogrowing.Thelargedisplacementdieselengine,emissionsofpollutantscausedbybad,suchasfogTing,biochemicalsmogpollutionandotherenvironmentalproblemsinEuropeandtheUnitedStates.StartedveryearlyresearchandGovernanceontheemissionofdieselengine,theimplementationofstrictemissionregulations,domesticandinternationalcurrentemissionscontrolfordieselenginesismainlyEGRandSCRtwotechnicalroute.However,theEGRlinewillincreasethefuelconsumptionandmoresensitivetosulfurinfuel,domesticfuelproductsQualityremainstobeimprovedfueleconomyofthe.SCRroute,thedieselenginewithsmallchangesandnotsensitivetosulfur,bettercontinuousupgradingoftechnology,somostofthedomesticheavy-dutydieselenginemanufacturerstomeetthefutureofcountry6emissionshaveadoptedtheEuropeanrouteSCRroute.Keywords:National6standard;dieselengine;emissiontechnology目录1引言.........................................................................................................11.1研究背景..............................................................................................11.2柴油机主要排放污染物以及排放标准..............................................11.2.1柴油机主要排放污染物...................................................................11.2.2柴油机主要排放标准.......................................................................41.3满足国6排放标准的两条技术路线...................................................51.3.1优化燃烧+SCR路线.........................................................................51.3.2EGR+DOC+DPF路线......................................................................52SCR技术路线原理.................................................................................62.1颗粒物PM的机内控制.......................................................................62.2SCR系统及工作原理..........................................................................72.2.1SCR系统工作原理...........................................................................72.2.2SCR技术反应机理...........................................................................93SCR后处理系统中的OBD应用...........................................................93.1SCR系统的OBD总体策略...............................................................103.2OBD功能的验证..............................................................................114满足国6排放的发动机台架试验........................................................124.1柴油机台架试验系统........................................................................124.1.1台架试验对象.................................................................................134.1.2台架试验主要测量仪器...
