The injection rate modulation and the spray characteristics are determining factors for the quality of mixture formation when applying GDI. Their variation with load and speed is a basic criterion for the adaptability of a type of injection system to an engine with known requirements. The increased interest for the utilization of regenerative fuels - such as methanol obtained from biomass - as well as the success of previous utilization scenarios of variable gasoline/methanol mixture using manifold injection formed the base of the present analysis: the paper describes the results concerning injection performances and spray characteristics when using gasoline/methanol mixtures with different ratios in a direct injection system with high pressure modulation. The results are compared for different parameters of the injection systems as follows: injection volume, injector opening pressure, needle lift, pintle/seat geometry. The injection performance and the time-related spray characteristics using a laser sheet technique were analysed for different gasoline/methanol ratios. The influence of mixture content on the injection parameters results as moderate. This is a valid argument for modeling and optimization of the internal mixture formation process using direct injection of gasoline/methanol mixtures.


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    Title :

    Direct Injection of Variable Gasoline/Methanol Mixtures: Injection and Spray Characteristics


    Additional title:

    Sae Technical Papers


    Contributors:
    Stan, C. (author) / Grimaldi, C. N. (author) / Postrioti, L. (author) / Tröger, R. (author)

    Conference:

    SAE 2001 World Congress ; 2001



    Publication date :

    2001-03-05




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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