In the presented project and in participation of 17 companies an optimized cooling system was developed to reduce fuel consumption and to improve the vehicle thermal conditions. The energy- and heat-flows of a production test car were measured - using steady-state operating-points - and the potential savings were analysed. The coolant circuit and the air path of the cooling system were then modelled with one dimensional simulation tools. Based on the simulation the layout of the cooling system was optimized and implemented in the test vehicle. A lot of variations and different optimizing strategies for the components of future cooling systems could be considered. To improve the engine warmup and the control operations, transient cooling calcuations were introduced and experimentally verified. The flow conditions between front-end and radiator were investigated by using CFD-tools. The following components were integrated in the test vehicle: Variable louvres in the grill, water-cooled generator, map-regulating thermostat, low-temperature coolant circuit, external heat exchanger to cool or heat the transmission oil, adjustable coolant flow in the heating circuit. The function of the system and its improvements of fuel economy were tested in a hot climatic wind tunnel, in a full-scale aerodynamic wind tunnel, and - in the 'New European Driving Cycle' - on dynamic roller test stands. The achieved savings in fuel consumption were about 3 %.


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    Title :

    Optimierung eines Pkw-Kühlsystems zur Senkung des Kraftstoffverbrauchs


    Additional title:

    Optimization of a vehicle engine cooling system to reduce fuel consumption


    Contributors:
    Röser, P. (author) / Essers, U. (author) / Wiedemann, J. (author)


    Publication date :

    2001


    Size :

    17 Seiten, 18 Bilder, 4 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    German




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