Repeatabilities of PM measurements on a heavy-duty diesel engine equipped with a diesel particulate filter (DPF) using a filter weighing method and a number counting method with a full flow dilution system and a partial flow system were evaluated. The filter method with partial flow exhibited the best repeatability. However, a good correlation between the full flow and the partial flow number counting results suggests that the fluctuations observed using the number counting method were caused by changes in the engine exhaust. Applying a strict preconditioning procedure should improve the repeatability of the number counting method because this method is more sensitive than the filter weighing method. In addition, the effects of the specifications for the number counting method were evaluated. The results indicate that the hose length from the tip of the sampling probe to the inlet of the number counting system had a negligible effect. In the cold mode, particle adsorption in the full flow dilution system was observed, and it was remarkable when the induction hose temperature was below 30 °C.


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    Title :

    Optimization of PM Measurements with a Number Counting Method


    Additional title:

    Sae Int. J. Engines


    Contributors:

    Conference:

    Powertrains, Fuels and Lubricants Meeting ; 2008


    Published in:

    Publication date :

    2008-10-06


    Size :

    7 pages




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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