A new urea-dosing device with an active-ammonia production function was developed. This function is achieved by an electrically heated bypass passage with a hydrolysis catalyst for urea-to-ammonia conversion. The new device also has the function of mixing ammonia and exhaust gas. It is compact and has low-pressure loss by using the vortex occurring at the back of a static vane. We built a trial device for a small diesel engine and obtained steady state and transient data. The heated-bypass concept can be used in the aftertreatment system of passenger cars. Although active-ammonia production consumes electric power, a predictive calculation of power consumption (based on experimental results) shows that the developed bypass heater can suppress the energy consumption enough not to harm the high-energy efficiency of diesel engines.


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    Titel :

    A Urea-Dosing Device for Enhancing Low-Temperature Performance by Active-Ammonia Production in an SCR System


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Nishioka, Akira (Autor:in) / Yokota, Hiroshi (Autor:in) / Amou, Kiyoshi (Autor:in) / Murakami, Teruhiko (Autor:in)

    Kongress:

    SAE World Congress & Exhibition ; 2008



    Erscheinungsdatum :

    2008-04-14




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch





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