The development of future vehicle powertrains must ensure compliance with the increasingly stringent emissions legislation and achieve improvements in sustainability - in particular a significant reduction of CO2 emissions. Lower CO2 emissions in short and medium term can be achieved only by a further reduction in fuel consumption. For this purpose, a continuous development and increased efficiency of powertrain technology is required. With alternative powertrain technologies / hybrid concepts the availability of fossil energy resources can be extended and a CO2 emission reduction can be achieved due to reduced fuel consumption.