Hybrid with Double-Clutch Transmission
Hybrids will come, partly forming the transitional period to the electric era, if only because they are the salvation for many companies because of excessive CO2 content. Our considerations will be limited
to the transverse drive. Usually an electric motor is situated in the clutch housing (E1), possibly with an additional clutch to the engine or connected by belt drive
like a generator (E2).
Magna-Getrag's solution includes an electric engine (E3) axis parallel connected with a 7-speed gearbox with wet double clutch via gears. Video 2 below
shows how favorable this arrangement is by exploiting the available space. It allows the hybridization of an existing vehicle without further changes.
This is an important difference to E1 because this greatly affects the all-important width of the transverse drive. In contrast to this E3 can be equipped with
electric motors of different strength. It is also available in the particularly easy-to-handle 48V technology. This is also the case with E2, but this has always to carry the combustion engine with it. Thus, with the purely
electric driving only 20 km/h are possible.
Even more important is the desired possible distribution of torque (Torquesplit). Here, E3 can be selectively switched on via the currently unused part of this
transmission with the help of the responsible clutch. This is called a shifting of the load point and thus means to put the combustion engine in a much more fuel-efficient operating range by the intervention of the
electric motor.
Turbocharged engines e.g. can be helped out of their turbo lag. Maybe the wet clutch makes sense here, too, because it allows a quick, but relatively smoother engagement of the electric motor. The engine
management even has the choice between three or four different gears to integrate the electric motor as best as possible.
Thus, depending on the wishes of the vehicle manufacturer, a mild or a full-fledged hybrid, possibly also with plug-in technology, which can be smaller and
lighter because of its high speed of over 18,000/min. Even more than 250 volts are possible, including skills such as recuperation and extended sailing. 01/18
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