Conventional engine cooling systems control the engine temperature by means of plain engine speed related pumps and plain wax thermostats for sensing water temperature. Such technologies are now becoming obsolete and are incapable of optimizing the coolant flow to serve in an effective way the needs of a combustion engine. Themis, the electronically controlled engine thermal system, regulates heat flows and temperatures according to engine load and status. Based on the feedback from the water temperature sensor, a centralized control drives 3 electrical actuators (Fan, water pump and water valve) along a specific control strategy dedicated to the engine thermal system. A model based software has been developed to manage heat flow and to control the heat released by the engine, under the worst conditions as well as in transient operation. This paper explains the results evidenced in an extensive real application on a mid size car, equipped with a standard 2,5L S.I. engine. Cold mission in North Europe, hot mission in South Italy, extensive road tests and emission tests have demonstrated that the Themis system was effectively operating under all conditions, including extreme ones. At the end of the application, results evidenced -4 % fuel saving, -10 % HC and -20 % CO emission on MVEG cycle. Additional benefits are also evidenced on cabin thermal comfort, engine reliability and feasible diagnostic.


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    Title :

    Effect of a regulated engine thermal system on CO2 and pollutant emissions


    Contributors:
    Geels, P.G. (author) / Gessier, B. (author) / Chanfreau, M. (author)


    Publication date :

    2002


    Size :

    10 Seiten, 10 Bilder



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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