Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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Experimental Verification of Adsorption Rate Feedback Control Strategy for Automotive Urea-SCR DeNOX System

실차 실험을 통한 승용 디젤엔진의 Urea-SCR을 위한 암모니아 흡장률 피드백 제어 분사전략 검증

  • Shin, Byeonguk (Dept. of Secured Smart Electric Vehicle, Kookmin Univ.) ;
  • Park, Jooyoung (Graduate School of Automotive Engineering, Kookmin Univ.) ;
  • Lee, Seang Wock (Graduate School of Automotive Engineering, Kookmin Univ.) ;
  • Kang, Yeonsik (Graduate School of Automotive Engineering, Kookmin Univ.)
  • 신병욱 (국민대학교 보안-스마트전기자동차) ;
  • 박주영 (국민대학교 자동차공학전문대학원) ;
  • 이성욱 (국민대학교 자동차공학전문대학원) ;
  • 강연식 (국민대학교 자동차공학전문대학원)
  • Received : 2016.11.11
  • Accepted : 2017.02.28
  • Published : 2017.06.01
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Abstract

In this study, a SCR system is employed to selectively reduce $NO_X$, which is a major cause of environmental pollution and issues in diesel engines. In particular, this paper focuses on the combination of feedforward injection strategies, depending on the NO/$NO_X$ ratio, and feedback injection control, using $NH_3$ coverage ratio, based on a SCR model. A 2.2 L passenger diesel engine, which is equipped with a diesel oxidation catalyst (DOC) and a diesel particle filter (DPF), was used in the experiments. The developed control algorithm is implemented on a real-time computer with injection control algorithm. By analyzing the $NO_X$ emission measurement, the performance of the proposed injection control algorithm is verified.

본 논문에서는 연비손실 없이 높은 $NO_X$ 저감성능을 보이는 승용 디젤 엔진의 SCR 시스템을 위한 요소수의 분사전략을 제시하였다. 배출되는 $NO_X$량 대비 요소수가 화학량론적 1:1인 피드포워드 분사 전략과 함께 모델기반의 촉매 내 $NH_3$ 흡장률 추정 기법을 통하여 피드백 분사 제어전략을 함께 사용함으로써 과도상태에서 $NO_X$ 저감성능과 $NH_3$ 슬립 성능을 모두 만족시키고자 하였다. 제안된 분사전략을 적용하여 디젤산화촉매기와, 미립자필터가 장착된 2.2L 디젤 엔진을 갖춘 실제 차량에서의 실험을 통하여 제어기의 높은 $NO_X$ 저감률과 낮은 $NH_3$ 슬립 성능을 검증하였다.

Keywords

References

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