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http://dx.doi.org/10.3795/KSME-B.2006.30.12.1181

Characteristics of Exhaust Gas Temperature and Harmful Emission During Cold Start Transient Operation in an SI Engine  

Cho, Yong-Seok (국민대학교 기계자동차공학부)
Jeong, Dae-Chul (국민대학교 자동차공학전문대학원)
Park, Young-Joon (국민대학교 자동차공학전문대학원)
Kim, Duk-Sang (국민대학교 자동차공학전문대학원)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.30, no.12, 2006 , pp. 1181-1187 More about this Journal
Abstract
Stringent regulations of exhaust emission from vehicles become a major issue in automotive industries. In SI engines, it is one of the crucial factor to reduce exhaust emissions during cold start in order to meet stringent regulations such as SULEV or EURO-4, because SI engines emit a large portion of total harmful exhaust compounds when they are cold. At early stages of cold start in gasoline engines, exhaust gas temperature plays a key role to improve three way catalyst by virtue of fast warmup. Therefore, this study focused on the increase of exhaust gas temperature under controls of engine operating parameters such as spark ignition timing, valve overlap by virtue of intake VVT and catalyst heating function. Furthermore, effects on harmful emission due to these parameters are also investigated. Experiments showed that retarded spark ignition timings and increased valve overlap may be helpful to increase exhaust gas temperature. It was also found that $NO_x$ was decreased with increased valve overlap. This study also showed that sudden changes in ISA and amount of fuel due to the deactivation of catalyst heating function cause temporal increase of harmful emissions.
Keywords
Exhaust Gas Temperature; Valve Overlap; Ignition Timing; Catalyst Heating Function; Exhaust Emission; Cold Start;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 Lee, J. H., Lee, C. H., Kim, D. S. and Cho, Y. S., 2005, 'Numerical Analysis of Flow Characteristics of Residual Gas due to Changes of Valve Timings During an Idle Operation in an SI Engine,' KSAE fall conference proceedings, Vol. 1, pp. 68-73
2 Jeong, Y. J., Kim, Y. Y. and Lee, J. T., 2004, 'A High Expansion Effects of Atkinson Cycle by Adopting Variable Intake Valve Closing Timing with Compensated Intake Air-mass and Effective Compression Ratio,' KSME fall conference proceedings, pp. 1698-1703
3 Kaidantzis, P., Rasmussen, P., Jensen, M., ？Vesterholm, T. and Hendricks, E., 1993, 'Transient A/F Ratio Errors in Conventional SI Engine Controllers,' SAE technical paper, No. 930856
4 Kim, D. S., Kim, S. C., Hwang, S. H., Cho, Y. S. and Ohm, J. Y., 2004, 'Estimation of Exhaust Gas Recirculation Using In-Cylinder Residual Gas Fraction in an SI Engine,' Trans. of KSAE, Vol. 12, No. 1, pp. 55-60   과학기술학회마을
5 Yang, C. S., Lim, C. K., Ahn, J. W., Kim, D. S. and Cho, Y. S., 2005, 'Raw Emissions and Changes of Combustion Stability with Controls of Timing Variables in Idle Operations of an SI Engine,' Trans. of the KSME(B), Vol. 29, No. 3, pp. 384-389   과학기술학회마을   DOI
6 Almukvist, G. and Eriksson, S., 1993, 'An Analysis of Air Fuel Ratio Response in a Multi Point Fuel Injected Engine Under Transient Conditions,' SAE technical paper, No. 932753
7 Shayler, P. J. and Goodman, M. S., 1996, 'Transient Air/Fuel Ratio Controls of an SI Engine Using Neural Networks,' SAE technical paper, No. 96026
8 Choi, M. S., Sun, H. Y., Lee, C. H., Myung, C. L. and Choi, J. K., 2000, 'The Study of HC Emission Characteristics and Combustion Stability with Spark Timing Retard at Cold Start in ？Gasoline Engine Vehicle,' SAE technical paper, 2000-01-1082