A transient heated converter model, coupled with vehicle emission testing with a prototype Park Avenue, has been used to develop strategies for reducing electrical power and energy requirements for electrically heated monolith converters (EHCs). The following two strategies were examined in detail: open-loop fuel-rich engine operation and use of low-thermal-mass electric heaters. It is found that although effective individually, a combination of these strategies provides even greater reductions in electrical power and energy requirements. For example, using a small-volume electric heater with fuel-rich engine calibration is predicted to give a 3-fold reduction in power and a 5-fold reduction in energy required to meet a cold-start HC emission target, compared to early prototype EHC systems operating with the baseline (fuel-lean) engine calibration. It is also found that a small-volume heater in an optimized EHC system serves primarily as a heat transfer medium/ignitor rather than a catalytic conversion device. This function of a small electric heater can be augmented by coupling it with an unheated “lightoff” catalyst containing high concentrations of noble metals.


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    Title :

    Mathematical Modeling of Electrically Heated Monolith Converters: Power and Energy Reduction Strategies


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    International Fuels & Lubricants Meeting & Exposition ; 1996



    Publication date :

    1996-05-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English





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