Um Treibstoffverbrauch und Emissionen zu reduzieren, können neuartige Antriebsstrang-Funktionen mit starken Auswirkungen auf das Bordnetz eingeführt werden. Dazu gehören Stop/Start-Betrieb, rekuperatives Bremsen und Betriebspunktoptimierung durch Generatorregelung. Der vorliegende Beitrag diskutiert vor diesem Hintergrund den Bedarf für ein hochentwickeltes Energie- Management in Kraftfahrzeugen mit konventionellem Antriebsstrang sowie mit Mikro- oder Mild-Hybrid-Antrieb. Veränderte Anforderungen an das elektrische Energiespeichersstem werden dargestellt. Simulations- und Versuchsergebnisse mit einer optimierten Generatorregelung in einem Mikrohybrid-Technologieträger werden dargestellt.
The need for reduced fuel consumption and emissions drives the introduction of novel powertrain functions that significantly impact the powernet design. These novel functions include engine idle removal by stop/start operation, regenerative braking, and operating point optimization with improved control of the generator or ISG. This paper evaluates the need for advanced Energy Management in passenger cars with conventional, micro-hybrid and mild-hybrid electric powertrains. In-vehicle electrical Energy Management can be differentiated to Power Supply Management and Power Distribution Management. A specific powertrain application requires a well-balanced control strategy that influences vehicle and powertrain attributes like performance, fuel economy and emissions. Such a strategy may be formulated using heuristic rules or a mathematically-based optimization. Future powertrain electric functions require energy storage systems that must deliver increasing levels of charge turnover. Here, modern lead/acid based batteries will see a continued application due to their cost advantage, but advanced technologies like NiMH, Li-ion and Electrolytic Double Layer Capacitors will be used in specific applications, e.g. when electric propulsion assist is used. An example of an analytically formulated optimization algorithm for generation in a micro-hybrid is provided. The algorithm achieved a significant improvement in fuel consumption and CO2 emissions.
Energy management in micro-hybrid cars
Energiemanagement in Mikrohybrid-Fahrzeugen
2005
20 Seiten, 7 Bilder, 3 Tabellen, 22 Quellen
Conference paper
English
Energy management in micro hybrid cars
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