Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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Air System Modeling for State Estimation of a Diesel Engine with Consideration of Dynamic Characteristics

동적특성을 고려한 디젤엔진 흡배기 시스템의 상태추정 모델

  • Lee, Joowon (Gasoline Engine Performance Test Team, Hyundai Motor Company) ;
  • Park, Yeongseop (Department of Automotive Engineering, Graduate School, Hanyang University) ;
  • Sunwoo, Myoungho (Department of Automotive Engineering, Hanyang University)
  • 이주원 (현대자동차 가솔린엔진성능시험팀) ;
  • 박영섭 (한양대학교 대학원 자동차공학과) ;
  • 선우명호 (한양대학교 미래자동차공학과)
  • Received : 2013.06.20
  • Accepted : 2014.01.17
  • Published : 2014.05.01
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Abstract

Model based control methods are widely used to improve the control performance of diesel engine air systems because the control results of the air system significantly affect the emission level and drivability. However, the model based control algorithm requires a lot of unmeasurable states which are hard to be measured in a mass production engine. In this study, an air system model of the diesel engine is proposed to estimate 11 unmeasurable states using only sensors equipped in a mass production engine. In order to improve the estimation performance in the transient condition, dynamic characteristics of the air system are analyzed and implemented as discrete filters. Turbine and compressor efficiency models are also proposed to overcome a limitation of the constant or look-up table based efficiency values. The proposed air system model was validated in steady state and transient conditions by real-time engine experiments. The maximum error of the estimation for 11 physical states was 11.7%.

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References

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