In view of the impending exhaust emission and fuel quality legislation in Europe, the motor industry is faced with developing engines giving low levels of HC and NOx emissions while operating on unleaded gasoline and retaining good fuel economy.Ricardo have designed an advanced open chamber combustion system with vertical in-line valves, designated the “Nebula” combustion chamber. The design is based on converting the intake generated air motion into turbulence near to TDC, thus producing a fast burn characteristic. Initial development was carried out on a 86 × 86mm Hydra single cylinder research engine, where spark plug position and intake port swirl ratio were optimised. This work demonstrated potential of the “Nebula” concept which showed a considerable reduction in HC and NOx emissions at part load.The “Nebula” combustion chamber has been applied to a 1.35 litre engine in a European vehicle. The engine is designed to use single point injection with microprocessor control of fuelling and ignition. The engine also utilises a simple variable geometry intake system which allows high swirl ratios to be used to give good lean mixture operation at light load, without degrading wide open throttle volumetric efficiency. Exhaust emissions and fuel economy potential are demonstrated over the ECE 15 drive cycle.


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    Titel :

    Gasoline Engine Combustion — The Nebula Combustion Chamber


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    de Boer, C. D. (Autor:in) / Grigg, D. W. (Autor:in)

    Kongress:

    22nd FISITA Congress ; 2002



    Erscheinungsdatum :

    1988-09-01




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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    Overington, M. T. / Thring, R. H. | SAE Technical Papers | 1981


    Gasoline Engine Combustion-Turbulence and the Combustion Chamber

    Overington,M.T. / Thring,R.H. / Ricardo Consult.Eng.,GB | Kraftfahrwesen | 1981


    Gasoline Engine Combustion - The High Ratso Compact Chamber

    Overington, M. T. / Thring, R H. | SAE Technical Papers | 1982


    Gasoline Engine Combustion - The High Ratio Compact Chamber

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