As emission regulations for cars become more and more stringent for both gasoline and diesel technologies, it is of interest to see if both cold and hot emissions of vehicles from the fleet follow the trends outlined by regulations. Both regulated and non-regulated emission data was collected for groups of cars (8-30 vehicles each) for legislation levels Euro-2 to Euro-4, separately for diesel and gasoline engines. In considering regulated and nonregulated gasoline vehicles emissions it can be clearly seen that improvements in the statutory tests are significantly smaller from Euro-3 to Euro-4 than previously. Cold start emissions remaining almost equal in particular contribute to this finding. In addition the discrepancy between hot emissions in the legislative test and in real-world tests is increasing. Improvements from Euro-3 to Euro-4 (without diesel particle filters - DPF) for both important pollutants, NO(x) and particle mass, are also small for diesel vehicles. This is paralleled by an increasing share of NO2 in NO(x). In contrast the group of Euro-4 vehicles with DPF shows a dramatic drop in particles. Unfortunately this is combined with an increase in both NO(x) and in the NO2 share in NO(x) (up to 65 %). Consequently, emission estimates assuming real-world emissions improving in line with legislative limits need to be corrected.


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    Title :

    Trends in regulated and non-regulated emissions of cars in both statutory and real-world driving conditions - Do they still follow regulations?


    Contributors:


    Publication date :

    2008


    Size :

    10 Seiten, 7 Bilder, 1 Tabelle, 19 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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