Fully Electric Public Transport
The electric bus with fast charging capacity combines state-of-the-art technologies in order to facilitate fully electric driving in regular service. The bus is recharged in a matter of seconds during regular stops using an especially developed contact system. Highly efficient battery technology and control systems round off the overall system.
Automated Fast Charging
In order to achieve a high vehicle range, large amounts of energy have to be transferred in short periods of time – similar to the standard refueling process. The Fraunhofer IVI has developed a fully automated, reliable and safe charging system for this application scenario that overcomes the performance restrictions of conventional plug-and-cable combinations. With the help of this technology, it will be possible to execute a fully automated charging process from positioning to billing in the future.
Safe and High-Performance Recharging
The operation of electrically driven public transport vehicles can help reduce the CO2 emissions in cities. However, supplying these vehicles with energy is problematic: Catenaries for trams and trolley buses are expensive and interfere with the existing city scape. In order to avoid catenaries, a recharging system is needed that is able to quickly and safely transmit energy to the on-board storage units.
What is currently impeding the overall introduction of electromobility in public transport is the lack of an area-covering network of charging stations as well as the still very limited range of fully-electric vehicles. The project SaxHybridPLUS is developing and testing core technologies for plug-in hybrid buses in order to level out the disadvantages of today’s electric vehicles by using a hybrid approach.
Comprehensive Concept for the Energy Supply of Public Transport Vehicles
In order for electromobility to firmly establish itself in public transport, it needs to be able to compete with conventional systems economically. The »DockingPrinciple« combines charging infrastructure installed along roads with on-board energy storage units and a predictive energy management system so that electric buses and trams can be operated efficiently.
Dimensioning Storage Units on the Basis of Measuring Data Analyses
A part of the energy contained in electric vehicle systems can be recuperated. In order for this to happen, the recuperated energy either has to be stored or it has to be supplied to a consumer connected to the grid. A vehicle storage unit can only be dimensioned in an optimal way after a variety of different parameters have been analyzed.
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Functional Safety and Compliance With Standards
Newly designed and constructed vehicles need a registration according to the ECE Regulations in order to be eligible for operation in general traffic. In addition, compliance with standards of functional safety needs to be ensured. The Fraunhofer IVI supports its clients in all relevant steps of the registration process, starting with the system definition and ending with the acceptance.
Optimal Materials and Configurations for Electromobility
In the next few years, the percentage of electric vehicles in road traffic will increase steadily. One important prerequisite for this development is a fast recharging option for the vehicles’ on-board energy storage units. Fast charging processes put a high strain on the components and materials involved. The Fraunhofer IVI studies high current transmission processes on their own test stand in order to design reliable, high-performance contact configurations.
Fraunhofer Institute for Transportation and Infrastructure Systems IVI