Un-throttling a direct injection gasoline homogeneous mixture engine with variable valve actuation

R. Patel, N. Ladommatos, P. A. Stansfield, G. Wigley, C. P. Garner, G. Pitcher, J. W.G. Turner, H. Nuglisch, J. Helie

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


Two direct injection spark ignition (DISI) engines with identical combustion chamber geometries and fuel injection systems were used to investigate fuel economy, exhaust emissions, the in-cylinder flow field, the fuel spray behaviour and combustion characteristics with early inlet valve closure (EIVC) strategies aimed at reducing parasitic induction work owing to throttling. One engine had extensive optical access through a transparent piston crown and transparent cylinder liner, while the other all-metal engine allowed continuous running. Engine running focused at low and intermediate engine loads (∼3 and ∼6 bar indicated mean effective pressure) and two engine speeds (2000 and 3500 r/min). The results show that the indicated specific fuel consumption (ISFC) could be reduced by almost 6 per cent without significant deterioration in gaseous exhaust pollutant emissions. The results also show that the in-cylinder bulk flow and turbulence and the thermodynamic conditions during combustion are affected significantly by EIVC operation. © Authors 2010.
Original languageEnglish (US)
Pages (from-to)391-411
Number of pages21
JournalInternational Journal of Engine Research
Issue number6
StatePublished - Dec 1 2010
Externally publishedYes

ASJC Scopus subject areas

  • Mechanical Engineering
  • Ocean Engineering
  • Automotive Engineering
  • Aerospace Engineering


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