A strong public transport network is of central importance to the management of the growing streams of people in towns and conurbations. In the process, the means of public transport operated must be as efficient, emissions-free and reliable as possible.
Through the use of electric motors, hybrid buses can be driven by a smaller conventional internal combustion engine. Through the downsizing of the engine, fuel consumption and emissions are reduced. In addition, hybrid buses use a regenerative brake system. Here, energy stores come into use in the form of ultracapacitors which, thanks to their high efficiency, can store and return a maximum amount of energy.
Their capacity to efficiently store and return high currents over innumerable deep discharge and charging cycles makes ultracapacitors an ideal energy storage technology for use in rail vehicles such as metros and trams. Ultracapacitors can temporarily store the braking energy of rail vehicles and return it specifically to the drive train when the train accelerates. Such systems reduce energy consumption and reduce the peak loads on the railway electricity network.
Ultracapacitor storage is also used in diesel driven trains and locomotives, where it delivers the high starting current for large diesel engines.
Ultracapacitors are excellently suited for the starting of heavy and medium duty truck diesel engines. Throughout the whole world, traditional lead-acid batteries on goods vehicle are increasingly being replaced by ultracapacitor storage. Above all, the advantages are the high level of reliability, especially at low temperatures, the low weight, the reduced dimensions and the long service life.