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한국자동차공학회논문집 = Transactions of the Korean Society of Automotive Engineers v.18 no.2 = no.104, 2010년, pp.122 - 128  
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ETC 모드에서 Urea-SCR 시스템의 성능 특성 연구
Study on the Performance Characteristics of Urea-SCR System in the ETC Test

함윤영    (우석대학교 기계자동차공학과   ); 최동석    (교통안전공단 자동차성능연구소   ); 박용성    (교통안전공단 자동차성능연구소  );
  • 초록

    To meet the NOx limit without a penalty of fuel consumption, urea-SCR system is currently regarded as promising NOx reduction technology for diesel engines. SCR system has to achieve maximal NOx conversion in combination with minimal $NH_3$ slip. In this study, the performance characteristics of urea-SCR system with open loop control were assessed in the European Transient Cycle(ETC) for heavy duty diesel engine. The SCR inlet temperaure varied in the range of 200 to $340^{\circ}C$ in the ETC cycle. Open loop control calculated the urea flow rate based on the NOx and NSR map which gave for each combination of SCR inlet temperature and space velocity the normalized $NH_3$ to NOx stoichiometric ratio which resulted in a steady-state $NH_3$ slip of 20ppm. During the ETC cycle, the open loop control with the optimized NSR offset achieved NOx reduction of 80% while keeping the average $NH_3$ slip below 10ppm and maximum 20ppm. It was also found that NOx sensor was cross-sensitive to $NH_3$ and a control strategy for cross-sensitivity compensation was required in order to use a NOx sensor as feedback device.


  • 주제어

    유럽 동적상태 시험모드 .   질소산화물 .   요소 .   암모니아 슬립 .   선택적촉매환원.  

  • 참고문헌 (12)

    1. T. V. Johnson, "Diesel Emission Control in Review," SAE 2009-01-0121, 2009. 
    2. K. Hirata, N. Masaki, H. Ueno and H. Akagawa, "Development of Urea-SCR System for Heavy-Duty Commercial Vehicles," SAE 2005-01-1860, 2005. 
    3. D. H. E. Seher, M. Reichelt and S. Wickert, "Control Strategy for NOx-Emission Reduction with SCR," SAE 2003-01-3362, 2003. 
    4. M. Koebel, M. Elsener and M. Kleemann, "Urea-SCR: a Promising Techique to Reduce NOx Emissions from Automotive Diesel Engines," Applied Catalysis, pp.335-345, 2000. 
    5. C. Havenith and R.Verbeek, "Transient Performance of a Urea deNOx Catalyst for Low Emissions Heavy-Duty Diesel Engines," SAE 970185, 1997. 
    6. S. J. Jeong, S. J. Lee, W. S. Kim and C. Lee, "Numerical Study on the Injector Shape and Location of Urea-SCR System of Heavy-duty Diesel Engine for preventing NH3 Slip," Transactions of KSAE, Vol.14, No.1, pp.66-78, 2006.     
    7. R. V. Helden, R. Verbeek, F. Willems and R. V. D. Welle, "Optimization of Urea SCR deNOx Systems for HD Diesel Engines," SAE 2004-01-0154, 2004. 
    8. M. Chen and S. Williams, "Modelling and Optimization of SCR-Exhaust Aftertreatment Systems," SAE 2005-01-0969, 2005. 
    9. T. Wang, S. Baek, M. Jung and G. Yeo, "A Study of $NH_{3}$ Adsorption/Desorption Characteristics in the Monolithic $NH_{3}$-SCR Reactor," Transactions of KSAE, Vol.14, No.3, pp.125-132, 2006.     
    10. H. S. Kim, Y. I. Jeong, M. H. Song, S. W. Lee, H. D. Park and J. W. Hwang, "Influential Factors for NOx Reduction Performance of Urea-SCR System for an In-use Medium Duty Diesel Engine," Transactions of KSAE, Vol.17, No.1, pp.154-161, 2009.     
    11. L. Hofmann, K. Rusch, S. Fisher and B. Lemire, "Onboard Emission Monitoring on a HD Truck with an SCR System Using NOx Sensors," SAE 2004-01-1290, 2004. 
    12. F. Willems, R. Cloudt, E. Eijnden, M. Genderen and R. Verbeek, "Is Closed-Loop SCR Control Required to Meet Future Emission Targets?," SAE 2007-01-1574, 2007. 

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