Since the lead acid starter battery is a limiting element for storing recuperation energy, especially after a few months in service, new mechanisms need to be found that can make use of the remaining electrical energy not storable in the battery. One very effective way to use the energy is to heat up the engine oil after a key crank to reduce the engine friction and thus gaining a fuel economy benefit. The FE Benefit is estimated between 0.5 % and 1 % in the NEDC. The benefit is also given for real world driving since the engine oil temperature is far below nominal operating values at the start of many trips. Ford has set up a demonstrator vehicle with a modified oil cooler housing that includes two heating elements. The elements are activated during recuperation phases as well as continuously in the early phase of each trip, provided the battery state is in a range that is high enough for robust operation. During NEDC approximately 141 kJ of recuperated energy was used to heat the engine oil. For all vehicle tests conducted so far charge balance was maintained, i.e. the battery charge after the NEDC cycle was always equal or greater than the battery charge at the beginning of the cycle. This is of high importance to prove that fuel economy can be improved also during real world driving.


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    Title :

    Increased recuperation of kinetic energy in micro-hybrid vehicles


    Additional title:

    Erhöhte Rekuperation kinetischer Energie in Mikro-Hybrid Fahrzeugen


    Contributors:


    Publication date :

    2009


    Size :

    12 Seiten, 10 Bilder


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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