Browse > Article

Exhaust Gas Temperature and Combustion Stability Variation due to Changes in Spark and Exhaust Valve Timings  

Kim Duksang (Graduate School of Automotive Engineering, Kookmin University)
Park Youngjoon (Graduate School of Automotive Engineering, Kookmin University)
Yang Changsuck (Graduate School of Automotive Engineering, Kookmin University)
Cho Yong-Seok (Graduate School of Automotive Engineering, Kookmin University)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.13, no.4, 2005 , pp. 90-96 More about this Journal
Abstract
The improvement of combustion stability is very important because it is closely related to the exhaust emission concentrations as well as the fuel consumption during the cold start of SI engine. In our previous studies, the spark and exhaust valve timings were retarded individually from the baseline case to increase the exhaust gas temperature far fast warmup of a close-coupled catalyst. In the study, it was found that combustion stability during cold start becomes worse when the valve timing is retarded from the baseline conditions. The spark and valve timings were simultaneously changed from the baseline conditions to find out the variation of combustion stability during cold start of an Sl engine. Through the study. retarded spark timing by $5^{\circ}$ CA helps improvement of $COV_{imep}$ by $2\%$ and $15^{\circ}C$ increase of exhaust temperature. Retarded exhaust valve timing makes the exhaust gas temperature increase by $30^{\circ}C$, but it also deteriorates the $COV_{imep}$ by $1\%$.
Keywords
Combustion stability; Exhaust gas temperature; Cold start; Catalyst warmup; Valve timing; Spark timing;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 J. S. Lee, 'A Study on the Improvement of Combustion Stability for SI Engine at Idle Operation,' Spring Conference Proceeding, Vol.I, KSAE, pp.196-202, 1998
2 Y. J. Chung, G. S. Cho and W. B. Kim, 'The Influence of Engine Operation Variables on Idle Stability in the S. I. Engine,' Spring Conference Proceeding, Vol.11, KSAE, pp. 461-466, 1996
3 D. S. Kim, S. C. Kim, S. H. Hwang, Y. S. Cho and I. Y. Ohm, 'Estimation of Exhaust Gas Recirculation using In-Cylinder Residual Gas Fraction in an SI Engine,' Transactions of KSAE, Vol.12, No.1, pp.55-60, 2004
4 K. H. Lee and K. S. Kim, 'Influence of Initial Combustion in SI Engine on Following Combustion Stage and Cycle-by-Cycle Variation in Combustion Process,' Int. J. Automotive Technology, Vol.2, No.1, pp.25-31, 2001
5 S. Russ, M. Thiel and G. Lavoir, 'SI Engine Operation with Retarded Ignition: Part 2- HC Emissions and Oxidation,' SAE 1999-01-3507, 1999
6 D. S. Kim, J. Y. Lee, Y. H. Lee and Y. S. Cho, 'Variation of Exhaust Gas Temperature with the Change of Spark Timing and Exhaust Valve Timing during Cold Start Operation of an SI Engine,' Spring Conference Proceeding, Vol.I, KSAE, pp.58-64, 2004
7 C. S. Kim, H. B. Song, J. H. Lee, J. S.Yoo, H. S. Cho and D.Y. Ahn, 'Effect of Valve Timing on Residual Gas Fraction and Combustion Characteristics at Part Load Condition in SI Engines,' Transactions of KSAE, Vol.8, No.4, pp.26-33, 2000
8 Kistler Instruction Manual: M5 Sensors Type 6052B, 002-017e-02.03, Kistler, p. 28, 2003
9 H. S. Cho, S. H. Hwang and J. W. Lee, 'Modeling and its Experimental Validiation on Cycle Variability of Combustion at Idle Operation,' Transactions of KSAE, Vol.4, No.2, pp.221-229, 1996