Vehicle electrical systems are affected by the continuous increase of functions for comfort, safety, driver assistance and infotainment. The demands on energy and power in the vehicle power supply have therefore increased dramatically since mid of the last decade. With respect to the ongoing electrification of power train functions and auxiliary units these requirements lead the existing vehicle power supply to its limits of load capacity. BMW faces these challenges for future vehicles with new concepts concerning power management, power supply architecture and load efficiency. Accordingly future architectures will be based on a high efficient 12 V power supply, which is extended by specific subnets and additional energy storage devices. This speech covers the procedure, solution approaches and intermediate results with special focus on start-stop systems. The essential characteristics of the architectures 'Basic Power Supply' (Architecture A), 'Load-sided Extension' (Voltage stabilization Unit, DBU, BNE and combinations of this - Architectures B, B1, B2, B3 and its combinations) and 'Generator-sided Extension' (Architecture C) discussed here are rated with respect to their performance in start-stop mode, recuperation, electrification and load compensation of the basic battery. The ratings refer to a typical well equipped middle class vehicle. According to this depending on the degree in electrification, start-stop and recuperation functionality different (combinations on) architectures should be used. While architecture C 2 supports all demands on enhanced power and energy by applying a generator-sided architecture, architecture B 3 represents a cost-effective and easy solution if only enhanced start-stop and recuperation modes are required.
Power supply in future start-stop-systems
2011
17 Seiten, 8 Bilder, 1 Tabelle, 14 Quellen
Aufsatz (Konferenz)
Englisch
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