제어알고리즘에 따른 Urea SCR 분사 시스템의 NOx 및 NH₃ 배출 특성A Study on NOx and NH₃ Emission Characteristics of Urea SCR Dosing System According to Control Algorithms
- Other Titles
- A Study on NOx and NH₃ Emission Characteristics of Urea SCR Dosing System According to Control Algorithms
- Authors
- 정수진; 이호길; 오세두; 박정권; 김영득; 심성민; 김우승
- Issue Date
- Nov-2009
- Publisher
- 한국자동차공학회
- Keywords
- SCR (Selective Catalytic Reduction,선택적환원촉매); Urea (요소); NH₃ (암모니아); NOx (질소산화물); NEDC (New European Driving Cycle)
- Citation
- 한국자동차공학회 추계학술대회 및 전시회, pp.707 - 714
- Indexed
- OTHER
- Journal Title
- 한국자동차공학회 추계학술대회 및 전시회
- Start Page
- 707
- End Page
- 714
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/40924
- Abstract
- The selective catalytic reduction(SCR) system is a highly-effective aftertreatment device for NOx reduction of diesel engines. Generally, the ammonia(NH₃) was generated from reaction mechanism of urea solution in the SCR system using the liquid urea as the reductant. Therefore, the precise urea dosing control is a very important factor for reducing NOx and NH₃ slip in the SCR system. This paper investigated that the effect of urea dosing control algorithms on NOx and NH₃ emission characteristics in order to minimize NOx emission and NH₃ slip. In the map-based control algorithm, the urea injection was determined by mass flow rate of exhaust gas based on engine rpm, torque and O₂, NOx concentration measured by NOx sensor. However, this algorithm cannot consider the effect of adsorption and desorption of NH₃ so that the amount of urea injection may be over- and under-estimated, which leads to NH₃ slip and deterioration of deNOx performance. Therefore, the model-based control algorithm based on physics of chemistry and mechanics has been developed in this study. The mass flow rate map obtained from engine test and NO, NO₂ and O₂ concentration measured by NOx sensor during engine test were used. A comparison of map-based and model-based control algorithms has been performed in terms of NOx emission and NH₃ slip
- Files in This Item
-
Go to Link
- Appears in
Collections - COLLEGE OF ENGINEERING SCIENCES > DEPARTMENT OF MECHANICAL ENGINEERING > 1. Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.