During the last decade, the demand for Diesel powered passenger cars has been growing considerably. In the highly competitive automobile market, it has therefore become very important for vehicle manufacturers to offer high quality Diesel powertrains. Sound quality is one important criterion that can convey quality to the customer, as customer clinics have confirmed. For Diesel passenger cars, a major sound quality ingredient is the 'pleasentness' attribute which is highly dependent on the absence of Diesel Knocking (e.g. combustion noise) which is regarded as an error state by many. Narrow Band Modulation Analysis (NBMA) is presented as a useful tool to address the Diesel Knocking phenomenon. From NBMA, a modulation spectrum is derived which can pinpoint critical Knocking frequencies that would often not be visible in the conventional average spectrum. The Diesel Knocking Index DKI is presented as a reliable single number metric to quantify sound quality deterioration through Diesel Knocking. With two examples, the DKI application in the Diesel powertrain sound quality development is outlined. In the first example, two different RHS engine mount designs were installed in a Ford Mondeo TDCi to check the impact that this part of the structure borne transfer path has on vehicle interior Knocking noise. Another typical example is the impact that different fuel injection strategies can have on Diesel Knocking noise. In this experiment, calibration parameters like rail pressure and pilot injection strategy were varied regardless of attributes other than Knocking noise.


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    Title :

    Diesel powertrain sound quality


    Additional title:

    Geräuschqualität Diesel-Antriebsstrang


    Contributors:


    Publication date :

    2004


    Size :

    9 Seiten, 9 Bilder


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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