A fuel cell vehicle can benefit from being hybridized with an energy storage (ES) device (battery or ultracapacitor). The benefits could inc lude improved vehicle performance and fuel economy und lower system cost. Previously, the degree of hyhridization benefits from (a) fuel cell of efficiency characteristics (b) fuel cell downsizing, (c) displacing fuel cell tasks with the ES functionality, or (d) energy recovery through regenerative braking were not well understood. To take advantage of these potential benefits, the attributes of the ES system must be defined relative to the fuel cell. The role of batteries and ultracapacitors in hybrid fuel cell vehicles has been recently studied to understand their potential impact on fuel economy and performance. The impact of fuel cell performance and control strategy on the benefits of hybridization has also been studied. This paper addresses (1) the impact of fuel cell efficiency characteristies on vehicle system efficiency; (2) the fuel economy trend that results from downsizing different fuel cells; and (3) the ES required to meet the performance requirements of midsize hybrid fuel cell cars.
Analysis of fuel cell vehicle hybridization and implications for energy storage devices
Analyse des Hybridausbaus eines Fahrzeugs mit einer Brennstoffzelle und Einbau von Energiespeichern
2004
18 Seiten, 15 Bilder, 8 Tabellen, 14 Quellen
Conference paper
English
Direct Hybridization Fuel Cell – Ultracapacitors
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