Innovative Powertrain Concept for the Smart Vehicle of the Future The main challenge of developing battery electric powertrains for the smart vehicle of the future is to mediate between the competing goals of high efficiency, low costs and at the same time high comfort. In order to resolve this conflict of goals, at TU Darmstadt innovative hybrid electric powertrain systems called “Two-drive Transmission” (TDT) are developed. Based on the “Two-drive Transmission with Range Extender” (DE-REX) project results, the potentials of the powertrain concept were successfully demonstrated. AUTHORS Andreas Viehmann, M. Sc. is Research Assistant at the Institute for Mechatronic Systems in Mechanical Engineering (IMS) at TU Darmstadt (Germany). Jean-Eric Schleiffer, M. Sc. is Research Assistant at the Institute for Mechatronic Systems in Mechanical Engineering (IMS) at TU Darmstadt (Germany). Dr.-Ing. Ruben König was Research Assistant at the Institute for Mechatronic Systems in Mechanical Engineering (IMS) at TU Darmstadt and is now Systems Engineer Advanced Development, System & Innovation at Continental in Nuremberg (Germany). Prof. Dr.-Ing. Stephan Rinderknecht is Head of the Institute for Mechatronic Systems in Mechanical Engineering (IMS) at TU Darmstadt (Germany). © TU Darmstadt RESEARCH TRANSMISSIONS 70