The constant rise in the number of electrical consuming units with peak currents of several 100 A and the consequent increase in a vehicle's requirement for electrical energy can place a significant load on classical 12V power net systems. Manufacturers are focusing their efforts on speeding up the introduction of start-stop systems because this also has further potential for reducing fuel consumption. Relying exclusively on lead batteries with a considerably higher capacity results in considerably reduced cycle strength and higher weight and fails to provide the "reflex start" which is so important for customer satisfaction. Moreover, a bigger battery would be an unsatisfactory way of solving the problem of transient voltage drops. This problem becomes particularly acute when major loads, such as belt-driven starter generators or electrical steering systems are switched on and off for short periods. Current approaches towards power net stabilization are mainly based on feeding in additional energy in parallel during transient load conditions. This is usually done using a DC/DC converter from separate energy storage units (secondary batteries). Another approach is offered by connecting up an additional energy storage unit in series for a limited time. Providing the battery with extra support in this way has the effect of raising the battery voltage in a controlled manner and thus stabilizing the power net. Additional energy storage units connected in series to the battery provide a time limited, stabilized voltage supply for the lowest system costs while, at the same time, meeting all the requirements for redundancy and functional safety. The switching modules of topologies of this type can also be used as double storage managers for coasting. This presentation describes the typical structure of such systems and topologies and the characteristic results of tests carried out in the laboratory and an the test vehicle.


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    Title :

    Stabilized powernet system in vehicle with serial energy storage solution


    Contributors:


    Publication date :

    2011


    Size :

    12 Seiten, 10 Bilder, 8 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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