New and more energy efficient powertrain concepts driven by increased focus and demands on the reduction of fuel consumption and CO2 are developed by the automotive industry. The extensive utilisation of downsizing concepts like e.g. boosting may lead to significant challenges in vehicle noise, vibration and harshness (NVH) refinement. In the premium vehicle segment superior vehicle NVH including high performance and low fuel consumption is expected. By combining superand turbo-charging, i.e. introducing a twin charger boosting system, together with downsizing / speeding, the fuel economy is improved and short time to torque and high driving dynamics are achieved. However, this concept requires extensive NVH abatement due to the high frequency characteristics of roots type blower's acoustic source strength resulting from its internal gas exchange process. The relationship between source strength and audible interior tonal noise thresh old has to be considered in the NVH integration. The pressure pulsation orders (tonal noise com ponents) can be very prominent and annoying even with a high degree of acoustic source treatment (abatement) as consequence of low noise masking effects of e.g. combustion related powertrain or road noise. The scope of this paper describes aspects of NVH characterisation and optimisation of a roots type blower for a super- and turbo-charged direct injected gasoline engine application using both experimental and analytical methods. Design changes without typical NVH / efficiency trade off, i.e. improving NVH and blower performance are presented and discussed.


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    Title :

    NVH Optimisation of a Roots Type Blower for a Twin Charger DI Gasoline Engine


    Contributors:


    Publication date :

    2014


    Size :

    11 Seiten, Bilder, 7 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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