In the present paper, a number of methods were discussed which allow to assess a turbocharger or a turbocharged engine and vehicle. As the turbocharger as component gets more important with increasing share of turbocharged and especially downsized gasoline engines, new methods have to be found to evaluate the turbocharger itself in addition to the usual thermodynamic compressor and turbine maps. Besides the thermodynamic assessment of the turbocharger, the acoustic behaviour with the different possible acoustic phenomenas also gives room for optimization, and an early detection of weak points here can reduce time and costs during the later phase of engine development. A huge potential is seen in the combined use of testing and simulation methods, because calibrated simulation models can support the evaluation of the systems by virtual testing of nonexisting hardware versions. The results of such simulations can also serve as input for databases, taking into account the limitations of simulations, but overcoming also the limitations of turbocharger testing, which often suffers from uncontrollable and non-reproducible test conditions like e.g. heat transfer. If the system boundaries are widened to turbocharged engines or even complete vehicles, it gets more complicated to draw conclusions about the turbocharger itself from measurements, but at least the transient behaviour which is one of the main challenges for future downsized engines, especially of gasoline type, is regularly evaluated using e.g. scatterbands and driver ratings. Further steps will be to find closer correlations of engine and vehicle behaviour with turbocharger characteristics. All these measures discussed here lead to an overall assessment and detailed weak point analysis of an existing system, which is the base for an efficient optimization of existing hardware or can serve as a well-founded base for decisions about new developments, in case performance borderlines of the existing concepts are reached.


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    Title :

    Assessment of charging systems for gasoline engines


    Contributors:


    Publication date :

    2009


    Size :

    15 Seiten, 17 Bilder, 4 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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