杨璐,王贵勇,王煜华,等.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[J].内燃机工程,2023,44(3):63-71.
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
Research on Virtual Calibration of Urea-Selective Catalyst Reduction System and Optimization Method of NOx Conversion Rate of A Diesel Engine
DOI：10.13949/j.cnki.nrjgc.2023.03.008
关键词:柴油机  选择性催化还原  NOx  虚拟标定  遗传算法
Key Words:diesel engine  selective catalytic reduction（SCR）  NOx  virtual calibration  genetic algorithm
基金项目:云南省科技厅揭榜制项目（202104BN050007）；云南省科技计划项目（202102AC080004）
作者单位E-mail
杨璐* 昆明理工大学 云南省内燃机重点实验室，昆明 650500 544106196@qq.com 
王贵勇* 昆明理工大学 云南省内燃机重点实验室，昆明 650500 wangguiyong@kust.edu.cn 
王煜华 昆明理工大学 云南省内燃机重点实验室，昆明 650500 2869290956@qq.com 
何述超 昆明云内动力股份有限公司，昆明 650500 544106196@qq.com 
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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。
Abstract:Based on the virtual calibration method using the joint simulation of the physical model of the urea-selective catalyst reduction（SCR） system and the urea injection quantity control model， the target NOx conversion rate map was obtained. The multi-objective genetic algorithm was used to optimize the urea-SCR system， NOx conversion and NH3 leakage value， and the target value of the optimal urea injection volume was obtained from urea-SCR system. The effects of the original exhaust parameters and the optimization results on the NOx conversion were analyzed. The simulation results show that the optimized urea injection amount can achieve higher NOx conversion rate， and the NOx conversion rate is increased by 35% around on average under the condition of exhaust temperature of 200~300 ℃， which conforms to the China Ⅵ emission standard for NH3 leakage limits.
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