Lean-burn combustion in SI engines can significantly reduce fuel consumption but NOx reduction becomes challenging because classic three-way catalyst (TWC) is no more efficient. Urea-SCR is then an interesting alternative solution because of its high NOx conversion efficiency without any additional fuel consumption.The coupling between two SI lean-burn engines (stratified and homogeneous combustion) and a urea-SCR catalyst was simulated on the NEDC cycle. Simulation results showed that the SCR efficiency would comply with the limits required by future Euro 5/6 regulations. Associated urea solution consumptions were estimated thanks to a simplified model.Finally, a comparison with a Diesel application was also made. It showed that the required amount of reducing agent remained significantly higher for SI lean-burn engines than for Diesel engine.


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    Title :

    Simulation of Urea-SCR Process Applied to Lean-burn SI Engines


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    SAE 2009 Powertrains Fuels and Lubricants Meeting ; 2009



    Publication date :

    2009-11-02




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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