An investigation into the post-LNT NH3 generation and NOx slip over an LNT was completed for the purposes of determining the proper calibration for NOx reduction over a downstream SCR. Experiments were conducted in an engine dynamometer on the DW12 2.2L diesel engine that was calibrated for rich operation.The catalyst system was evaluated at 325°C for three different engine speed/load points. Engine speeds of 1750, 2000, and 2500 rpm were chosen, resulting in a LNT space velocities of 35,000 - 68,000 hr-1. Increased lean times were tested, which resulted in NOx loadings on the LNT that ranged from 0.10 - 0.50 grams NOx/L catalyst. In addition, varied degrees of richness were tested, corresponding to lambda sensor readings of 0.90, 0.92, and 0.94.LNT performance was evaluated based on it's ability to provide a stoichiometric ratio of reactants to the SCR for NOx conversion. Gross and net NOx conversion was evaluated for a LNT-SCR system. Optimal NOx conversion for this type of system required a balance between providing sufficient reductant for NH3 generation without poisoning the SCR from HC. System performance was controlled by calibration of NOx loading and degree of richness.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Calibration of a LNT-SCR Diesel Aftertreatment System


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Montreuil, Cliff (Autor:in) / Dobson, Doug (Autor:in) / Cavatatio, Giovanni (Autor:in) / Snow, Rachel (Autor:in) / Hammerle, Robert (Autor:in)

    Kongress:

    SAE World Congress & Exhibition ; 2007



    Erscheinungsdatum :

    16.04.2007




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Calibration of a LNT-SCR Diesel Aftertreatment System

    Snow, R. / Cavatatio, G. / Dobson, D. et al. | British Library Conference Proceedings | 2007


    Calibration of a LNT-SCR diesel aftertreatment system

    Snow,R. / Cavatatio,G. / Dobson,D. et al. | Kraftfahrwesen | 2007


    Diesel aftertreatment

    International Fall Fuels and Lubricants Meeting and Exposition | TIBKAT | 2000


    2007-01-1244 Calibration of a LNT-SCR Diesel Aftertreatment System

    Snow, R. / Cavatatio, G. / Dobson, D. et al. | British Library Conference Proceedings | 2007


    Diesel exhaust aftertreatment 1994

    Society of Automotive Engineers (SAE) | TIBKAT | 1994