Enhancements of today's Micro-Hybrids based on stop-start systems with and without coasting and energy recuperation show a positive cost-benefit and a much shorter payback period compared to more complex and expensive Full-Hybrid concepts. However, improved Micro-Hybrid functionalities have a higher demand on the vehicle's electrical power network, which cannot be covered with traditional topologies alone.To enable the advanced Micro-Hybrid features, additional energy storage elements like second lead acid batteries, double-layer capacitors or lithium-ion cell based storage systems will be integrated into the power network. This will stabilize the network and provide a reliable source of energy. To apply even further reaching measures like creeping (also called crawling), and high power recuperation, a dual voltage power network will be required. This can be achieved by adding a second voltage level to the traditional 12V power network.In order to connect power networks with different voltage levels, DC/DC converters are required. This paper will discuss the constraints of a cost-optimum topology for each power class of DC/DC converter from Micro- up to Mild-Hybrid applications and present solutions to overcome these limitations. Furthermore, the different topologies are compared in regards of their economic benefit using the total cost of ownership model.
Integrated Energy Storage Systems to Optimize Payback Period of Hybrid Vehicles
Sae Int. J. Alt. Power
SAE 2012 World Congress & Exhibition ; 2012
Sae International Journal of Alternative Powertrains ; 1 , 1 ; 97-103
2012-04-16
7 pages
Aufsatz (Konferenz)
Englisch
Integrated Energy Storage Systems to Optimize Payback Period of Hybrid Vehicles
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