Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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Experimental Study on Natural Gas Conversion Vehicle(1) - Fuel Economy, Emission and Roadability

천연가스 개조 승용차에 대한 실험적 연구(1) - 연비, 배기 및 주행 성능

  • Kim, Hyung-Gu (Graduate School of NID Fusion Technology, Seoul National University of Science and Technology) ;
  • Kim, Inok (Graduate School of Energy & Environment, Seoul National University of Science and Technology) ;
  • Ohm, Inyong (Department of Mechanical & Automotive Engineering, Seoul National University of Science & Technology)
  • 김형구 (서울과학기술대학교 NID융합기술대학원) ;
  • 김인옥 (서울과학기술대학교 에너지환경전문대학원) ;
  • 엄인용 (서울과학기술대학교 기계.자동차공학과)
  • Received : 2015.05.07
  • Accepted : 2015.05.26
  • Published : 2015.07.01
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Abstract

In this study, the roadability, fuel economy and emission characteristics were evaluated for a natural gas converted vehicle. The results are as follows; Not only the shortage of power was observed in stall test, but also large deterioration of acceleration performance was exposed in roadability. Compared to the original LPG system, the acceleration is 76% in start acceleration and 45 ~ 65% in overtaking acceleration, especially the decline became larger when air conditioner is at work. Furthermore, because the mapping data, which controls the injection depending on driving condition, do not match up with injection system, the failure of air-fuel ratio feedback control occurs resulting from the large gap between the required and the really supplied amount of fuel. This failure cause the exhaust gas to emit without catalytic conversion and the fuel economy based on the fuel heat value to get worse 22% in the mode test and 16% in road test respectively. In addition, the existing injection system does not secure enough fuel at the starting so that it may lead to the fail of clod start, the deterioration of hot start and inharmonic of engine at the idle after start.

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References

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