第44卷第3期2023年6月Vol.44No.3June2023内燃机工程ChineseInternalCombustionEngineEngineering柴油机尿素选择性催化还原系统虚拟标定及NOx转化率优化方法研究杨璐1,王贵勇1,王煜华1,何述超2(1.昆明理工大学云南省内燃机重点实验室,昆明650500;2.昆明云内动力股份有限公司,昆明650500)ResearchonVirtualCalibrationofUrea-SelectiveCatalystReductionSystemandOptimizationMethodofNOxConversionRateofADieselEngineYANGLu1,WANGGuiyong1,WANGYuhua1,HEShuchao2(1.YunnanKeyLaboratoryofInternalCombustionEngine,KunmingUniversityofScienceandTechnology,Kunming650500,China;2.KunmingYunneiPowerCo.,Ltd.,Kunming650500,China)Abstract:Basedonthevirtualcalibrationmethodusingthejointsimulationofthephysicalmodeloftheurea-selectivecatalystreduction(SCR)systemandtheureainjectionquantitycontrolmodel,thetargetNOxconversionratemapwasobtained.Themulti-objectivegeneticalgorithmwasusedtooptimizetheurea-SCRsystem,NOxconversionandNH3leakagevalue,andthetargetvalueoftheoptimalureainjectionvolumewasobtainedfromurea-SCRsystem.TheeffectsoftheoriginalexhaustparametersandtheoptimizationresultsontheNOxconversionwereanalyzed.ThesimulationresultsshowthattheoptimizedureainjectionamountcanachievehigherNOxconversionrate,andtheNOxconversionrateisincreasedby35%aroundonaverageundertheconditionofexhausttemperatureof200~300℃,whichconformstotheChinaⅥemissionstandardforNH3leakagelimits.摘要:基于尿素选择性催化还原系统物理模型与尿素喷射量控制模型联合仿真的虚拟标定方法,获得了目标NOx转化率脉谱;采用多目标遗传算法对尿素选择性催化还原系统进行优化,得到最优尿素喷射量目标值,同时优化了NOx转化率和NH3泄漏值。分析了原排参数及优化结果对NOx转化率的影响。仿真结果表明,采用优化后的尿素喷射量可实现较高的NOx转化率,在排温200~300℃的条件下NOx转化率平均提高35%左右,同时满足国六排放法规对NH3泄漏限值的要求。关键词:柴油机;选择性催化还原;NOx;虚拟标定;遗传算法Keywords:dieselengine;selectivecatalyticreduction(SCR);NOx;virtualcalibration;geneticalgorithmDOI:10.13949/j.cnki.nrjgc.2023.03.008中图分类号:TK421文章编号:1000-0...