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Effects of various intake valve timings and spark timings on combustion, cyclic THC and NOX emissions during cold start phase with idle operation in CVVT engine

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Abstract

In a gasoline SI engine, valve events and spark timings put forth a major influence on overall efficiency, fuel economy, and exhaust emissions. Residual gases controlled by the valve overlap can be used to reduce NOx emissions and the spark retardation technique can be used to improve raw THC emissions and catalyst light-off performance during the cold start phase. This paper investigated the behaviors of the engine and its combustion characteristics with various intake valve timings and spark timings during the fast idle condition and cold start. And cyclic THC and NOx emissions were measured at the exhaust port and their formation mechanisms were examined with fast response gas analyzers. As a result, THCs and NOx were reduced by 35% and 23% with optimizing valve overlap and spark advance during the cold transient start phase. Consequently, the valve events and ignition timings were found to significantly affect combustion phenomena and cold-start emissions.

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Authors and Affiliations

  1. School of Mechanical Engineering, Korea University, 1, 5-Ga, Anam-dong, Seongbuk-gu, Seoul, 136-701, Korea

    Kwanhee Choi, Hyungmin Lee, In Goo Hwang, Cha-Lee Myung & Simsoo Park

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  1. Kwanhee Choi
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  2. Hyungmin Lee
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  3. In Goo Hwang
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  4. Cha-Lee Myung
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  5. Simsoo Park
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Correspondence to Simsoo Park.

Additional information

This paper was recommended for publication in revised form by Associate Editor Kyoung Doug Min

Simsoo Park received his B.S. and M.S. degrees from Seoul National University in 1977 and 1979, respectively, and a Ph.D. from the State University of New York at Stony Brook. He served as a Principle Research Engineer at Hyundai Motor Company, a Director for Publication of the KSME, a Technical Advisor of Hyundai-Kia Motor Company, and an Editing Director, Project Director, International Director, Accounting Director, and General Affair Director of KSAE. He is currently Vice President of Editing and International at KSAE and a professor of mechanical engineering at Korea University.

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Choi, K., Lee, H., Hwang, I.G. et al. Effects of various intake valve timings and spark timings on combustion, cyclic THC and NOX emissions during cold start phase with idle operation in CVVT engine. J Mech Sci Technol 22, 2254–2262 (2008). https://doi.org/10.1007/s12206-008-0611-6

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  • DOI: https://doi.org/10.1007/s12206-008-0611-6

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