吉林大学学报(工学版) ›› 2018, Vol. 48 ›› Issue (4): 1055-1062.doi: 10.13229/j.cnki.jdxbgxb20171213

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Design and analysis of nonlinear state observer for master-slave two cell Urea-SCR system of diesel engine

GONG Xun1,2,3, JIANG Bing-jing2, HU Yun-feng1,2, QU Ting1, CHEN Hong1,2   

  1. 1.State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130022, China;
    2.Department of Control Science and Engineering,Jilin University, Changchun 130022, China;
    3.Department of Aerospace Engineering,Michigan University,Ann Arbo 48109,USA
  • Received:2017-12-11 Online:2018-07-01 Published:2018-07-01

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Abstract: As one of the effective approaches to reduce NOx emission of diesel, Urea Selective Catalytic Reduction (Urea-SCR) can catalytically convert toxic NOx emission to nitrogen and water by accurately controlling the amount of ammonia injection. However, there still exists problem such as non-measurable states in Urea-SCR. To resolve this problem in the Urea-SCR feedback control system, first, the chemical reaction mechanism of DCR system is analyzed and a model containing both upstream and downstream (master-slave) elements is introduced. Second, a nonlinear reduced-order observer is designed to observe the non-measurable states by utilizing the concentration measurement downstream ammonia and NOx, meanwhile, the stability of the observer is analyzed and the value range of the observer parameter is calculated based on stability analysis. Finally, the effectiveness of the proposed approach is testified by simulation in enDYNA employing FTP75 cycle test procedure.

Key words: power machinery engineering, diesel engine, SCR control system, nonlinear observer, stability analysis

CLC Number: 

  • TK411
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