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Publication Detail
Un-throttling a direct injection gasoline homogeneous mixture engine with variable valve actuation
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Article
  • Authors:
    Patel R, Ladommatos N, Stansfield PA, Wigley G, Garner CP, Pitcher G, Turner JWG, Nuglisch H, Helie J
  • Publisher:
    PROFESSIONAL ENGINEERING PUBLISHING LTD
  • Publication date:
    2010
  • Pagination:
    391, 411
  • Journal:
    INT J ENGINE RES
  • Volume:
    11
  • Issue:
    6
  • Print ISSN:
    1468-0874
  • Language:
    EN
  • Keywords:
    early inlet valve closure, EIVC, camless engine, direct injection spark ignition, DISI, variable valve actuation, exhaust pollutant emissions, spark ignition
  • Addresses:
    Ladommatos, N
    UCL
    Dept Mech Engn
    London
    England
Abstract
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 (similar to 3 and similar to 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.
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