Improvements of the car energy consumption and efficiency in regard to reduced CO2 emissions and the broad realization of electro mobility are still remaining the main focus of the automotive development in the future. Based on the well-known and implemented stop-start function using voltage stabilizer DC/DC converters or dual battery implementations, upcoming Micro Hybrid functionalities like enhanced stop start, zero emission coasting and regenerative braking as well as boosting and creeping are being developed to achieve the future emission reduction targets of 2020. In addition, new energy efficient actuators like electrical power steering were widely introduced to contribute positively to the energy efficiency of today's cars. However, these actuators harm the stability of the 12 V power system significantly. To cover these different demands, a new dual voltage power system architecture based on 48 V was initiated and developed during the recent years. Core components of this new architecture are the DC/DC power converter and the 48 V energy storage system which has to be added. The alternator is shifted from 12 V to the 48 V power system and has to be adapted accordingly. In the following the DC/DC converter as well as the 48 V storage are discussed in detail. Within the energy storage system the regenerated braking energy should be accumulated. Afterwards it supplies the 48V system as well as the 12 V consumers using the DC/DC converter. The total duration of possible regenerative braking timings is below 10% within the NEDC. This means that charging capability exceeds discharging current by a factor of approximately 10.


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    Title :

    Potential and components of 48 V low cost hybrid vehicles


    Contributors:


    Publication date :

    2013


    Size :

    20 Seiten, 13 Bilder, 9 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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