Within the scope of the Green Move project, the consortium succeeded in integrating hybrid technology into a standard bus for use in scheduled urban service. As a prerequisite for use in scheduled service, homologation for obtaining type certification was achieved within a very short time.
The consortium also created a modern drive concept that uses an electric portal axle with hub motors. For this they adapted the hardware and software in the power electronics and in the diesel engine’s management system as required. In enhancing the drive controls and energy management, regulating the EEV-format diesel engine represented a particular challenge. There is still potential here for further development, as the consortium was not able to achieve a satisfactory outcome within the research period. They did succeed, however, in improving the operation of electric auxiliary consumers such as fans, pumps (cooling system) and power steering pump in respect to noise generation and energy consumption. They also compared different energy management systems, e.g. trajectory operation, output tracking and best point operation. By stipulating an energy management system inclusive of stop/start function that is location dependent and delivers optimum energy efficiency, the hybrid technology became something that passengers could really experience. The simulation calculations carried out in parallel, in which the reference bus’ results were compared with the hybrid drive system’s theoretical results, produced fuel consumption savings in every driving cycle performed.