Study on Shortening Light-Off Time of Three Way Catalyst and Reduction of Harmful Emissions with Exhaust Synthetic Gas Injection(ESGI) Technology during Cold Start of SI Engines

가솔린 기관의 냉간시동 조건에서 합성가스 배기분사 기술에 의한 촉매의 활성화 온도 도달시간 단축 및 유해배출물 저감에 관한 연구

  • Cho, Yong-Seok (Department of Mechanical and Automotive Engineering, Kookmin University) ;
  • Lee, Seang-Wock (Department of Mechanical and Automotive Engineering, Kookmin University) ;
  • Won, Sang-Yeon (Graduate school of Automotive Engineering, Kookmin University) ;
  • Song, Chun-Sub (Graduate school of Automotive Engineering, Kookmin University) ;
  • Park, Young-Joon (Graduate school of Automotive Engineering, Kookmin University)
  • 조용석 (국민대학교 기계자동차공학부) ;
  • 이성욱 (국민대학교 기계자동차공학부) ;
  • 원상연 (국민대학교 자동차공학전문대학원) ;
  • 송춘섭 (국민대학교 자동차공학전문대학원) ;
  • 박영준 (국민대학교 자동차공학전문대학원)
  • Published : 2008.05.01

Abstract

Since regulations of exhaust emissions are continuously reinforced, studies to reduce harmful emissions during the cold start period of SI engines have been carried out very extensively worldwide. During the cold start period, raising the temperature of cold exhaust gas is a key strategy to minimize the light-off time of three way catalysts. In this study, a synthetic gas containing a large amount of hydrogen was injected into the exhaust manifold to raise the exhaust gas temperature and to reduce harmful emissions. The authors tried to evaluate changes in exhaust gas temperature and harmful emissions through controlling the engine operating parameters such as ignition timings and lambda values. Also the authors investigated both combustion stability and reduction of harmful emissions. Experimental results showed that combustion of the synthetic gas in the exhaust manifold is a very effective way for solving the problems of harmful emissions and light-off time. The results also showed that the strategy of retarded ignition timings and increased air/fuel ratios with ESGI is effective in raising exhaust gas temperature and reducing harmful emissions. Futhermore, the results showed that engine operating parameters ought to be controlled to lambda = 1.2 and ignition timing = $0{\sim}3^{\circ}$ conditions to reduce harmful emissions effectively under stable combustion conditions.

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