The analysis of different topologies for energy storage systems showed that the lifetime, sustainability and stability of power system and CO2 emissions can already be significantly improved for conventional 12 V vehicle implementations. The use of lithium-ion cells is beneficial for lowering storage capacity which lowers costs; it also makes it possible to increase the energy recuperation considerably, fully meet the requirements of a vehicle's electric system, and to realize the engine-off coasting function. Compared to a 12 V micro hybrid with an energy storage system, it is possible to harvest a lot more energy by using a 48 V architecture with an alternator power class up to 15 kW. The requirements of the engine-off coasting function - the availability of a second energy supply - are met by the 48 V and 12 V battery in combination with the 48 V/12 V DC/DC converter. However, it is much easier and cheaper to implement the 12 V topologies described here than to introduce a second voltage level and it also represents a particularly advantageous solution for the low to medium car segments. However, for high-power applications/actuators such as electric roll stabilization or electric turbochargers, which cannot be realized on 12 V, an extension to the 48 V vehicle electric system architecture is unavoidable. In addition the CO2 saving potential can be beneficially improved.
Next generation micro hybrid - saving potentials and their implementation
2014
9 Seiten, Bilder, 2 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
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