The responsible use of limited fossil energy sources and the reduction of exhaust emissions into the atmosphere are the principal motivators behind the search for a comprehensive powertrain optimization, which is aimed at an overall efficiency enhancement. Future powertrain concepts will be made up of several subsystems: internal combustion engine (i.c. engine), electrical machine, automatic or automated manual transmission. Increasing driving comfort while reducing fuel consumption - these two are conflicting, even diametrically opposed objectives in the general development process of a vehicle. Integrated Powertrain Management (IPM) is a contribution to solve this conflict by optimizing the interaction between internal combustion engine, electrical motor (e.g. Integrated Starter Generator) and automatic transmission. IPM does not have a direct influence on the conversion of the fuel-stored energy (gasoline, Diesel, natural gas, hydrogen), but instead attempts, from a holistic and integral point of view, to optimize the operating points of the energy converters (i.c. engine, electrical motor), the electrical storage system in its capacity as energy reservoir, and the torque converters (transmission). Due to the numerous degrees of freedom inherent in such a system, the optimal management and coordination of the downstream aggregates, based on the centralized interpretation of driver intentions and driving situation identification in consideration of the priorities specified, are of the upmost importance. As a result, the weaknesses inherent in the one energy converter are compensated by the strengths inherent in the other. Specifically, it is the lower speed range where the i.c. engine torque weakness is equalized by additional torque contributed by an electric motor. Thus the vehicle gives a better performance in spite of identical engine displacement. Siemens VDO is offering a solution for a modular hardware-, software- and function platform incl. ISG. The customer can combine them with his preferred components however, certain rules of combination keep valid. For effective boosting and regenerative braking results, to name just two examples, the drivetrain must be equipped with a suitable electrical motor plus energy reservoir. The start/stop function can be implemented as a module with various different starters, i.c. engines and transmission systems. The characteristics of the individual functions are detailed in a data sheet (characteristics, customer advantages, input, output, processor and storage requirements, calibration parameters) in the same way as customary for regular electrical components. By adapting the vehicle to an individual company philosophy, the customer can create the type of vehicle behavior typical for his particular brand. The integration of functions into the existing controllers will be in accordance with the powertrain definition selected.


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