Transactions of the Korean Society of Machine Tool Engineers (한국공작기계학회논문집)

The Korean Society of Manufacturing Technology Engineers (한국생산제조학회)
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An Engine Model of a Heavy-Duty Compressed Natural Gas Engine for Design of an Air-Fuel Ratio Controller

대형천연가스차량의 공연비제어기 설계를 위한 엔진모델

  • 심한섭 (서울산업대학교 자동차공학과) ;
  • 이태연 (원주대학 동력기계과)
  • Published : 2003.10.01
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Abstract

Air partial pressure ratio and inlet air mass flow are influenced by water vapor and gaseous fuel in mixture on Compressed Natural Gas (CNG) engines. In this paper, the effects of the water vapor and the gaseous fuel that change the air mass flow and the air-fuel ratio are studied. Effective air mass ratio is defined as the air mass flow divided by mixture mass flow, and also it is applied to the estimation of the inlet air mass flow and the air-fuel ratio. The presence of the gaseous fuel and the water vapor in the mixture reduces the air partial pressure and the effective air mass ratio of the CNG engines. The experimental results for the CNG engine show that estimation of the air-fuel ratio based upon the effective air mass ratio is more accurate than that of a normal mode.

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References

  1. Korean Association Natural Gas Vehicles
  2. Proceeding of 8th Next Generation Vehicle Workshop Development of a CNG Engine for a Heavy-duty Commercial Vehicles Kyuhoon
  3. SAE paper v.111 Automotive Powertrain Modeling for Control Cho,D.I.;Hedrick,J.K.
  4. Int. J. of Vehicle Design v.26 no.2/3 A Nonlinear Dynamic Modeling of SI Engines for Controller Design Yoon,P.J.;Sunwoo,M.H.
  5. Autumn Conference proceeding, Korea automotive technology institute v.1 An Inlet Air-Mass Flow Modeling for an Effective Air-Mass Ratio on a Gaseous-Fuel Engine Sim,H.S.;Sunwoo,M.H.
  6. Trans. of KSAE v.7 no.9 Development of an Engine Modeling and an Engine Control Module for an LPG engine Sim,H.S.;Sunwoo,M.H.
  7. Trans. of KSMTE v.8 no.5 Air-Fuel Ratio Control Characteristics of an LPG Engine at Idle Lee,T.Y.;Sim,H.S.
  8. Proceedings of ACC v.1 Modeling, Validation and System Identification of a Natural Gas Engine Gangopadhyay,A.;Meckl,P.
  9. SAE940759 Transient Air Fuel Rate Estimation in a Natural Gas Engine Using a Nonlinear Observer Weeks,R.W.;Moskwa,J.J.
  10. New Thermodynamics Cho,J.H.
  11. Internal Combustion Engine Fundamentals Heywood,J.B.