This paper describes the set-up and testing of a single cylinder 25cc, air cooled, 4-stroke Spark Ignition (SI) engine converted to run in Homogeneous Charge Compression Ignition (HCCI) mode with the aid of various combustion control systems. The combustion control systems were investigated regarding their effects on combustion stability and heat release phasing. Engine operation was compared with unique findings from previous work done on a very small 2-stroke HCCI engine.HCCI engine operation was possible between 1000 - 4000 rpm when using Diethyl Ether (DEE) as the test fuel. Maximum operational fuel-air equivalence ratio (Φ) was 0.75 when operating without Exhaust Gas Recirculation (EGR). This relatively high equivalence ratio was attainable due to thermal gradients induced by the high surface area to volume ratio of the small engine combustion chamber, resulting in high chamber heat transfer. Combustion phasing peculiarities, due to fuel Negative Temperature Coefficient (NTC) auto-ignition behaviour, engine heat transfer and breathing characteristics, were investigated.Additionally, this paper provides a useful resource for building a compact, inexpensive HCCI engine test bed and matching HCCI engine model.


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    Title :

    25cc HCCI Engine Fuelled with DEE


    Additional title:

    Sae Int. J. Engines


    Contributors:

    Conference:

    Powertrains, Fuels and Lubricants Meeting ; 2009


    Published in:

    Publication date :

    2009-06-15


    Size :

    15 pages




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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