International Journal of Automotive Technology

The Korean Society of Automotive Engineers (한국자동차공학회)
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EFFECTS OF CAM PHASE AND SPARK RETARD TO INCREASE EXHAUST GAS TEMPERATURE IN THE COLD START PERIOD OF AN SI ENGINE

  • KIM D.-S. (Graduate School of Automotive Engineering, Kookmin University) ;
  • CHO Y.-S. (Graduate School of Automotive Engineering, Kookmin University)
  • Published : 2005.12.01
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Abstract

The effects of spark timing and exhaust valve timing change on exhaust gas temperature during cold start period of an SI engine are studied through engine bench tests. The exhaust gas temperature increases when the spark timing or valve timing are retarded individually, due to late combustion or slow flame speed. Therefore, exhaust gas temperature shows a large increase when the two timings are retarded simultaneously. However, it is considered that combustion stability during cold start deteriorated under these retarded conditions. To increase exhaust gas temperature for fast warmup of catalysts while maintaining combustion stability, an optimal condition for spark and valve timing retard should be applied for the cold start period.

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References

  1. Charles, E. R. and Stanglmaier, R. H. (1999). Investigation of intake timing effects on the cold start behavior of a spark ignition engine. SAE Paper No. 1999-02-3622
  2. Cho, Y.-S. and Kim, D.-S. (2004). LDV measurement, flow visualization and numerical analysis of flow distribution in a close-coupled catalytic converter. KSME Int. J. 18, 11, 2032-2041
  3. Cho, Y.-S. and Kim, D.-S. (2005). Chang of catalyst temperature with UEGI technology during cold start. Int. J. Automotive Technology 6, 5, 445-451
  4. Heywood, J. B. (1988). Internal Combustion Engine Fundamentals. McGraw-Hill. New York. 386-389
  5. Koo, J. M. and Bae, C. S. (2001). Effects of variable valve timing operation modes on engine performances. Trans. Korean Society of Automotive Engineering 9, 6, 24-29
  6. Monaghan, M. L. (2000). Future gasoline and diesel engine-review. Int. J. Automotive Technology 1, 1, 18
  7. Russ, S., Lavoie, G. and Dai, W. (1999). SI engine operation with retarded ignition: Part 1 - cyclic variations. SAE Paper No. 1999-02-3506
  8. Russ, S., Lavoie, G. and Dai, W. (1999). SI engine operation with retarded ignition: Part 2 - emissions and oxidation. SAE Paper No. 930386
  9. Summers, C., Summers, J. C., Skowron, J. F. and Miller, M. J. (1993). Use of light-off catalysts to meet the California LEV/ULEV standards. SAE Paper No 930386