The Federal Test Procedure (FTP) test contains an initial period, prior to the catalyst becoming fully activated, during which hydrocarbons escape the vehicle. These hydrocarbons constitute 60-80% of the total emitted over the entire FTP test. To meet future emission levels mandated by the California Air Resources Board, alternate technologies must be created that deal effectively with these cold start hydrocarbons. This paper describes an adsorbent bed/catalyst system that can trap approximately 70% of the available nonmethane hydrocarbons over the first two minutes of the FTP test. Importantly, the trap does not require bypass valves because of a unique heat exchange approach to catalytically consuming the trapped hydrocarbons, and because the trapping materials are unaffected by engine exhaust temperatures below 800°C. Experiments with a prototype system demonstrate that LEV emissions are possible.


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    Titel :

    Hydrocarbon Traps for Controlling Cold Start Emissions


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:

    Kongress:

    International Congress & Exposition ; 1993



    Erscheinungsdatum :

    01.03.1993




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Hydrocarbon traps for controlling cold start emissions

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    Cold-start hydrocarbon emissions control

    Burk,P.L. / Hochmuth,J.K. / Anderson,D.R. et al. | Kraftfahrwesen | 1995


    Cold start hydrocarbon emissions control

    Burk,P.L. / Hochmuth,J.K. / Anderson,D.R. et al. | Kraftfahrwesen | 1995


    Cold Start Hydrocarbon Emissions Control

    Burk, P. L. / Hochmuth, J. K. / Anderson, D. R. et al. | British Library Conference Proceedings | 1995