Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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Dynamic Decoupler Design for EGR and VGT Systems in Passenger Car Diesel Engines

승용디젤엔진 EGR 및 VGT 제어시스템의 동적특성을 고려한 Decoupler 설계 연구

  • Hong, Seungwoo (Department of Automotive Engineering, Graduate School, Hanyang University) ;
  • Park, Inseok (Automotive Control and Electronics Laboratory, Hanyang University) ;
  • Sohn, Jeongwon (Department of Automotive Engineering, Graduate School, Hanyang University) ;
  • Sunwoo, Myoungho (Department of Automotive Engineering, Hanyang University)
  • 홍승우 (한양대학교 자동차공학과) ;
  • 박인석 (한양대학교 자동차 전자제어연구소) ;
  • 손정원 (한양대학교 자동차공학과) ;
  • 선우명호 (한양대학교 미래자동차공학과)
  • Received : 2013.10.07
  • Accepted : 2013.11.10
  • Published : 2014.03.01
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Abstract

This paper proposes a decoupler design method to reduce interaction between exhaust gas recirculation (EGR) and variable geometry turbocharger (VGT) systems in passenger car diesel engines. The EGR valve and VGT vane are respectively used to control air-to-fuel ratio (AFR) of exhaust gas and intake pressure. A plant model for EGR and VGT systems is defined by a first order transfer function plus time-delay model, and the loop interaction between these systems is analyzed using a relative normalized gain array (RNGA) method. In order to deal with the loop interaction, a design method for simplified decoupler is applied to this study. Feedback control algorithms for AFR and intake pressure are composed of a compensator using PID control method and a prefilter. The proposed decoupler is evaluated through engine experiment, and the results successfully showed that the loop interaction between EGR and VGT systems can be reduced by using the proposed decoupler. Furthermore, it presents stable performance even off from the designed operating point.

Keywords

References

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