Two different configurations of electrically-heated catalyst systems were installed on two new production vehicles. A 1990 Buick LeSabre was evaluated with a heated catalyst placed directly in front of the main production catalytic converter while a 1990 Toyota Celica was evaluated with an electrically-heated catalyst placed between the main close-coupled catalytic converter and a smaller downstream production catalytic converter. Initial laboratory studies involved examination of heating strategies to minimize electrical energy requirements, a variety of off-board battery and recharging configurations for their effect on emissions, and multiple air injection strategies to achieve minimum hydrocarbon emissions while avoiding a NOx penalty. Final efforts involved installation of optimized, complete on-vehicle electrically-heated catalyst systems for subsequent on-road mileage accumulation. The vehicle conversions, albeit unaged, exhibited FTP emissions which show promise of meeting the California Ultra-Low Emission Vehicle standards, and have contributed to adoption of low emission standards by the California Air Resources Board.


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    Title :

    Electrically-Heated Catalyst System Conversions on Two Current-Technology Vehicles


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    International Congress & Exposition ; 1991



    Publication date :

    1991-02-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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