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Further fuel efficiency improvements are mandatory in order to achieve the CO2 emission limits envisaged in the future. Electrification of the powertrain is seen as one of the key technologies to achieve these future goals. However, electrification of the power train typically goes with a massive cost increase of the overall system itself which is especially crucial for cost sensitive markets like India. AVL's approach to cost reduction for comparable performance and fuel consumption target values is an integration of functions. This paper demonstrates that, through a deeper interaction of the single powertrain components, further fuel efficiency optimization may be gained. System optimization at a powertrain level enables the achievement of future powertrain targets with respect to fuel efficiency and performance with only minimal and reduced requirements at a component level (i.e. combustion engine, electric drive, transmission and battery).

For vehicles with transversely-installed engines and the request to design a four-wheel-drive concept at reduced costs, an alternative to the systems currently on the market is a torque-sensitive system such as the Torque Sensitive Double Differential Unit (TS DDU). In correlation with modern vehicle dynamics controls applying brake intervention, this system with torque- sensitive centre differential lock function is perfectly apt to provide optimum traction and driving behaviour for a customer's application profile. Moreover, the TS DDU allows to reduce the required space for the functions front and centre differential to that of a conventional front bevel gear differential.