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    • 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
    Key Words:diesel engine  selective catalytic reduction（SCR）  NOx  virtual calibration  genetic algorithm
    Author NameAffiliationE-mail
    YANG Lu* Yunnan Key Laboratory of Internal Combustion Engine，Kunming University of Science and Technology， Kunming 650500， China 544106196@qq.com 
    WANG Guiyong* Yunnan Key Laboratory of Internal Combustion Engine，Kunming University of Science and Technology， Kunming 650500， China wangguiyong@kust.edu.cn 
    WANG Yuhua Yunnan Key Laboratory of Internal Combustion Engine，Kunming University of Science and Technology， Kunming 650500， China 2869290956@qq.com 
    HE Shuchao Kunming Yunnei Power Co.， Ltd.， Kunming 650500， China 544106196@qq.com 
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    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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