The experience from 25000 km with a 26 kW powered electric car of 13 kWh range convinces the Heilbronn University team that electric car operation in mixed urban - regional areas is feasible today. Selected economic cruise control modes that utilize track conditions enlarge the vehicle range up to 20 %. However, range is and will be an issue for all battery electric vehicles. In this paper, a new challenging flywheel range-extending project EREX for energy regeneration and range extending is presented. Based on simulations and testbed experiments with a stationary flywheel, different operation modes for mobile flywheel devices suitable for electrically powered vehicles are presented. On the basis of realistic driving and track profile measurements, the potential of energy regeneration and power are calculated and applied to an electrically powered scooter. The chosen low-speed flywheel concept with a maximum rotor speed of 10 000 rpm stores an energy content of up to 2 Wh with a peak power of 12 kW generated by vehicle braking The flywheel device is located in the footwell of the scooter An eScooter equipped with such a mechanical storage is able to protect the battery from high loads and to buffer high peak power for a short time The next steps in the project are the completion and manufacturing of the prototype development followed by the setting up of the prototype test vehicle. Future traffic predictions state that in megacities the percentage of two-wheeled and mini vehicles will increase significantly. The project team is convinced that a flywheel approach with its advantages like a high number of charging and discharging cycles, the ability of deep discharge and a large recyclability ratio can contribute to an ecological future vehicle design.
Range extending for electric vehicle operation in urban-regional areas
2013
16 Seiten, Bilder, 15 Quellen
Aufsatz (Konferenz)
Englisch
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