The low pressure side of diesel fuel systems has an important impact on the overall capabilities of the injection system. The design of the low pressure side can greatly impact the temperature conditions in the rail and in the tank. Physical testing of the complete fuel system for observing temperature and thermal behavior is a long and expensive process, especially in the case of cold starts at low temperature. CAE and simulation tools have, in this case, an important added value. A tool to perform a thermal analysis of the complete fuel system is presented in this paper. Cycles leading to high temperature, along with cold start cases, are discussed. Testing the thermal aspects of the fuel system is a very expensive and complex process. Simulation tools that can predict and analyze the thermal behaviour of the fuel system can be used to reduce testing iterations. The modeling tool in this research work is based on Imagine Lab Thermo-hydraulic library (THH). This library applies a lumped parameter approach, introducing control volumes and resistive elements. The state variables in control volumes are pressure and temperature. The mass and energy balances are used to obtain the time derivatives for the state variables. Resistive components compute flows as function of pressure difference. Based on this lumped parameter approach, it is then possible to create more complex models for pipes, valves and other components. Since the focus is on thermal transients, we do not need to take into account fast pressure dynamics. Time scales are in fact decoupled. Wave effects and instantaneous flow variations are neglected. For instance, injector return flow is averaged in time. In the same way, pump flow ripples are neglected. Based on this approach, a complete simulation tool for low temperature operation of Diesel system has been successfully developed and validated on measurements. This work was done in the frame of a project for a car manufacturer.


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    Title :

    Simulation of thermal behaviour of closed loop common rail injection systems


    Contributors:


    Publication date :

    2008


    Size :

    15 Seiten, 17 Bilder, 6 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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