A Study on Reduction of Exhaust Gas Temperature in Retrofitted LPG Fueled Engine Based Medium-Duty Diesel Engine

중형 디젤을 기초한 LPG엔진에서 배기가스온도 저감 연구

  • 최경호 (계명대학교 기계ㆍ자동차공학부) ;
  • 조웅래 (계명대학교 대학원 기계공학과)
  • Published : 2003.03.01


The purpose of this study was to investigate reduction of exhaust gas temperature in LPG conversion engine from diesel. A conventional diesel engine was modified to a LPG(Liquified Petroleum Gas) engine that diesel fuel injection pump was replaced by the LPG fuel system. The research was peformed with measurement of exhaust gas temperature by varying spark ignition timing, air-fuel ratio, compression ratio, EGR ratio and different compositions of butane and propane. The major conclusion of this work were followed. (i) Exhaust gas temperature was decreased and power was increased with the advanced spark ignition timing. (ii) Exhaust gas temperature was decreased with lean and rich air-fuel ratio. (iii)Exhaust gas temperature was decreased and power was increased with the higher compression ratio. (iv) Engine power and exhaust temperature were not influenced by varied butane/propane fuel compositions. (v) Finally, one of the important parameters in reduction of exhaust gas temperature is spark ignition timing among the parameters in this study.


  1. E. Bass, B. Bailey, S. Jaeger, 'LPG Conversion and HC Emissions Speciation of a Light-Duty Vehicle,' SAE 932745, 1993
  2. M. S. Newkirk, L. R. Smith, M. E. Payne, J. S. Segal, 'Reactivity and Exhaust Emissions from an EHC-Equipped LPG Conversion Vehicle Operating on Butane/ Propane Fuel Blends,' SAE 961991,1996
  3. G. T. Kalghatgi, P. Snowdon, C. R. McDonald, 'Studies of Knock in a Spark Ignition Engine with 'CARS' Temperature Measurements and Using Different Fuels,' SAE 950690, 1995
  4. C. U. Kim, K. Y. Kang, S. M. Oh, 'The Fundamental Study on Liquid phase LPG Injection System for Heavy-Duty Engine(Ⅱ),' Transactions of KSAE, Vol.9, No.6, pp.1-7, 2001
  5. Y. H. Seo, W. Kang, 'Development of an LPG Engine for Medium-Duty Commercial Vehicles,' Transactions of KSAE, Vol.8, No.5, pp.1-11,2000
  6. H. S. Sim, M. H. Sunwoo, 'Development of an Engine Modeling and an Engine Control Module for an LPG Engine,' Transactions of KSAE, Vol.7, No.9, pp.1-9, 1999