Diesel Dual Fuel (DDF) operation is a promising alternative engine operating mode. Previous research studies have reported a DDF engine operating under low load conditions suffers from high HC emissions, mostly Methane. The current study investigated the use of a multiple direct injection strategy for improvement of low-load DDF operation in a commonrail direct injection single-cylinder diesel engine. Natural gas was supplied at 70% of energy replacement ratio.Results indicated that depending on engine conditions, a double-pulse injection had potential for combustion control and provided an effective way to reduce NOx and methane emissions. Moreover, the double-pulse injection helped improve the combustion stability, reduce the pressure rise rate, and decrease the maximum cylinder pressure, compared to DDF operation with a single pulse injection. Under low load conditions, the tuned injection strategies demonstrated significant operational improvement comparing with a simple DDF conversion that used the same injection timings as that of conventional diesel operations.


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    Title :

    Injection Strategies for Operational Improvement of Diesel Dual Fuel Engines under Low Load Conditions


    Additional title:

    Sae Technical Papers



    Conference:

    Powertrains, Fuels and Lubricants Meeting ; 2009



    Publication date :

    2009-06-15




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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