A full-hybrid system, featuring an electric motor in parallel with an engine, is not currently planned for the new 5-series, which instead is likely to feature the same system already used in the 1-series. This "light-hybrid" system consists of an electric starter motor that's connected to the crankshaft and can function as both a generator and a propulsion system, spinning the engine during initial off the line acceleration. The "light-hybrid" will be available in both diesel and petrol versions and expect a new V8 diesel engine to make its debut in the next-gen model. The "two-mode" hybrid transmission that was developed by BMW together with General Motors and DaimlerChrysler is mostly aimed at bigger vehicles such as trucks and SUVs. The design features dual motors, and an advanced control system that can allow both engines can be turned on simultaneously, and to regenerate electric power during braking.
This two-mode system, however, is not currently planned for the next generation 5-series, although BMW has not eliminated the possibility that a similar technology can be added towards the end of the model's life cycle. We'll have to make do with the "light hybrid" at the moment since BMW feels it has already succeeded in heavily reducing the fuel consumption of their engines. However, it remains to be seen whether or not BMW will be able to reach the EU's new requirements for average CO2 emissions of 130g/km by 2012.
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