Next Generation of Automobile Emissions Reduction: Innovative Control of Off-Cycle Emissions

    Research output: NRELTechnical Report


    Innovative heat management technologies can reduce emissions from cars by an order of magnitude. Substantial reductions would be realized during cold starts and in evaporative emissions. Such improvements result from a new class of variable-conductance steel vacuum insulations that insulate during one time period and take advantage of beneficial thermal conditions during another. Around acatalytic converter, for example, such control allows heat from one driving cycle to catalyze engine-out emissions occurring at the beginning of the next cycle. As with other more efficient uses of heat in automobiles, reduced complexity and cost are likely compared to supplemental catalyst heating systems. In a similar way, thermal cycling of fuel and the resulting vapor release can be reducedor avoided. Urban air quality could be greatly improved by the wide availability of vehicles using these technologies early in the next century. This paper presents analyses and prototype data supporting the design, operation, and rapid market penetration of internal combustion engine vehicles with significantly lower emissions based on such improved thermal management. Potential implicationsfor fleet emissions are discussed.
    Original languageAmerican English
    Number of pages20
    StatePublished - 1995

    NREL Publication Number

    • NREL/TP-473-7570


    • emissions
    • heat management technologies
    • thermal


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