The present paper describes the results of a joint development program focussing on a system approach to meet the proposed EURO III and IV emission standards for a passenger car equipped with a 3.2 liter, 18 valve gasoline engine. Starting with the in-production configuration of a EURO II certified vehicle (model year 1997) the following improvement points were investigated in detail.By the introduction of a close-coupled catalyst in combination with engine measures to improve the catalyst light-off the proposed EURO III limits were met. The proposed EURO IV hurdle could be overcome by further using secondary air injection during cold-start in combination with an increased precious metal loading for the close-coupled catalyst.In order to take care of the precious metal resources and to become more independant of precious metal price fluctuations, a new developed catalyst coating with an improved activity characteristic after high temperature aging on an engine and on a vehicle was introduced. Furthermore, the application of engine and catalyst measures are described to obtain a better catalyst durability by reducing the catalyst bed temperature during full load engine operation.Future development work will mainly focus on the optimization of the precious metal content including an OBD-control function to monitor the catalyst activity.


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    Titel :

    Development of Close-Coupled Catalyst Systems for European Driving Conditions


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Hirschmann, A. (Autor:in) / Waltner, A. (Autor:in) / Lindner, D. (Autor:in) / Loose, G. (Autor:in) / Mußmann, L. (Autor:in) / Müller, W. (Autor:in)

    Kongress:

    International Congress & Exposition ; 1998



    Erscheinungsdatum :

    1998-02-23




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Development of Close-Coupled Catalyst Systems for European Driving Conditions

    Waltner, A. / Loose, G. / Hirschmann, A. et al. | British Library Conference Proceedings | 1998


    Development of close-coupled catalyst systems for European driving conditions

    Waltner,A. / Loose,G. / Hirschmann,A. et al. | Kraftfahrwesen | 1998


    Development of increased test conditions for close-coupled catalyst applications

    Nagel,T. / Maus,W. / Breuer,J. et al. | Kraftfahrwesen | 1996


    Development of Increased Test Conditions for Close-Coupled Catalyst Applications

    Breuer, Jürgen / Nagel, Thomas / Maus, Wolfgang | SAE Technical Papers | 1996


    Development of Increased Test Conditions for Close-Coupled Catalyst Applications

    Nagel, T. / Maus, W. / Breuer, J. et al. | British Library Conference Proceedings | 1996