Ever stringent emission legislation has called for more advanced measures for petrol engine emission control. The main chanllenge is to largely cut off the engine cold-start emissions. The problem is that the catalytic converter does not operate effectively at temperature below the range of 250 - 300 °C at engine cold start. This paper presents an alternative approach, which needs no assistance from the external heat source such as electrically heating or burner/afterburner-assisting, etc, for rapid light-off an automotive catalyst using high value of ignition retard control. Proper control strategies permit a catalyst to reach lightoff within 50 seconds from cold-start. Emission data of unburnt hydrocarbons (in terms of hexane-equivalence) and carbon monoxide at both the upstream and downstream of a catalytic converter are measured. Results show that significant reduction in emissions can be achieved with proper ignition control strategies. The effect of high value ignition retard on the cold-start NOx emission is also briefly discussed.


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    Title :

    The Significance of High Value of Ignition Retard Control on the Catalyst Lightoff


    Additional title:

    Sae Technical Papers


    Contributors:
    Zhu, J. (author) / Chan, S. H. (author)

    Conference:

    1996 SAE International Fall Fuels and Lubricants Meeting and Exhibition ; 1996



    Publication date :

    1996-10-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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