Effects of valve timing and intake flow motion control on combustion and time-resolved HC & NOx formation characteristics

C. L. Myung, K. H. Choi, I. G. Hwang, K. H. Lee, Simsoo Park

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

In SI engines, valve events have a major influence on volumetric efficiency, fuel economy and exhaust emissions. Moreover, swirl and tumble motions in the intake charge also improve combustion speed and quality by stratifying the mixture as well as intensifying the mixing rate of air and fuel. This paper investigates the behaviors of an engine and the combustion phenomenon for various intake valve timings and intake charge motions using CVVT system and port masking schemes. Test condition includes a part load and a cold idle condition inclusive of a cold start of the engine. Time-resolved HC and NOx emissions were also measured at an exhaust port to examine their formation mechanisms and behaviors with fast response HC/NOx analyzers. In conclusion, the fast burning of fuel and improved combustion quality by enhanced charge motions reduced unburned HC emissions, and advancing the intake valve opening reduced HC as well as NOx. Furthermore, HCs during the cold transient phase and idle conditions decreased with recalibrated start parameters such as lean air-fuel ratio and spark retardation via the enhancement of intake charge motions.

Original languageEnglish
Pages (from-to)161-166
Number of pages6
JournalInternational Journal of Automotive Technology
Volume10
Issue number2
DOIs
Publication statusPublished - 2009 Apr 1

Fingerprint

Motion control
Flow control
Intake valves
Engines
Fuel economy
Air
Electric sparks

Keywords

  • CVVT
  • Fast response CLD
  • Fast response FID
  • Port masking
  • Swirl
  • Tumble

ASJC Scopus subject areas

  • Automotive Engineering

Cite this

Effects of valve timing and intake flow motion control on combustion and time-resolved HC & NOx formation characteristics. / Myung, C. L.; Choi, K. H.; Hwang, I. G.; Lee, K. H.; Park, Simsoo.

In: International Journal of Automotive Technology, Vol. 10, No. 2, 01.04.2009, p. 161-166.

Research output: Contribution to journalArticle

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AU - Park, Simsoo

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