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| Development of Status of Urea SCR System and Control Strategy for Heavy-Duty Diesel Vehicles |
| DOI：10.13949/j.cnki.nrjgc.2018.06.001 |
| Key Words:heavy duty diesel engine aftertreatment nitrogen oxides selective catalytic reduction（SCR） control strategy |
| Author Name | Affiliation | | WANG Guoyang, ZHANG Jun, QI Jinzhu, LIU Shiyu, XIAO Jianhua, SHUAI Shijin | 1.School of Energy and Power Engineering, Shandong University, Jinan 250061, China
2.State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China |
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| Abstract:According to the working principle of selective catalytic reduction(SCR) system, the catalyst integration scheme of DeNOx system was described. Focusing on the main problems faced by SCR control system, the advantages and disadvantages of traditional and advanced SCR control systems were highlighted. Research results show that the main problems faced by the SCR control systems are the nonlinear characteristics of the SCR model, the coupled control with multi-time scales and the reliability of commercial sensors used in the harsh environment. The NOx conversion efficiency of the open loop control system can reach 60%~80%, only meeting the requirements of China's CN Ⅳ and CN Ⅴ emission regulations. The closed-loop control system has a higher NOx conversion efficiency and can meet more stringent emission regulations. Advanced SCR control technology has good control effect and robustness, and can more effectively control NOx emissions and NH3 slip. In addition, the coordinated control of the engine and its aftertreatment system increases the controllability, which can further reduce the pollutant emissions from diesel vehicles. |
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