内燃机与配件www.nrjpj.cn基于某柴油机排放特性的机内净化技术优化分析严祖正,刘斌(中汽研汽车检验中心(天津)有限公司,天津300300)摘要:机内净化的主要目的是从源头上减少柴油机做功所产生的污染物,是降低柴油车尾气污染的重要手段之一。为优化机内净化技术,合理降低各工况排放污染物浓度,本文使用某3.8L四缸柴油机分别进行稳态和瞬态相关试验。试验首先通过稳定工况下调整EGR率、喷油提前角和轨压等条件分析缸内燃烧状态的变化对排放污染物的影响,然后通过比对瞬态循环冷、热启动下污染物浓度的差异分析温度对缸内燃烧状态的影响,最后根据以上分析结果探讨在保证动力性的前提下发动机降低排放污染物浓度的方法。关键词:柴油机;机内净化;排放特性;燃烧中图分类号:TK429文献标识码:A文章编号:1674-957X(2023)08-0025-03OptimizationAnalysisofInner-EnginePurificationTechnologyBasedonEmissionCharacteristicsofACertainDieselEngineYanZu-zheng,LiuBin(CATARCAutomotiveTestCenter(Tianjin)CompanyLimited,Tianjin300300China)Abstract:ThemainpurposeofInner-Enginepurificationistoreducethepollutantsgeneratedbydieselen-ginesfromthesource,whichisoneoftheimportantmeanstoreducetailpipeemissionsofdieselvehicles.Inor-dertooptimizetheInner-Enginepurificationtechnologyandreasonablyreducetheconcentrationofpollutante-missionsundervariousoperatingconditions,thisarticleconductedrelevanttestsona3.8Lfour-cylinderdieselengineinbothsteady-stateandtransientconditions.Firstly,theinfluenceofadjustingEGRrate,fuelinjectiontiming,railpressureandotherconditionsonthecombustionstateinthecylinderontheemissionofpollutantswasanalyzedunderstableoperatingconditions.Then,bycomparingthedifferenceinpollutantconcentrationduringtransientcyclesandcold/hotstarts,theinfluenceoftemperatureonthecombustionstateinthecylinderwasanalyzed.Finally,basedontheaboveanalysisresults,themethodsofreducingpollutantconcentrationintheenginewhileensuringpowerperformancewereexplored.Keywords:Dieselengine;Inner-Enginepurification;Emissioncharacter;Combustion作者简介:严祖正(1996—),男,籍贯:天津市,汉族,中汽研助理工程师,哈尔滨工业大学本科学士学位,能源与动力工程专业,研究方向主要为内燃机排放试验和发动机...
