BMW unveils C evolution electric scooter
With 11 kW continuous output and 35 kW peak output, the
"C evolution" has a powerful motor and provides a high level of
riding fun. The top speed is electronically limited to 120 km/h. The scooter
supremely handles motorway riding and overtaking - even with a passenger. It is
also capable of effortless hill starts on steep slopes with a pillion
passenger. In terms of acceleration from 0 to 60 km/h, it comfortably holds its
own against current maxi scooters a capacity of 600 cc or more.
Since it was conceived as a
future-oriented vehicle for commuting between the urban periphery and
the city centre, there were two particular requirements for its
development: performance figures comparable to those of a maxi scooter
with a combustion engine and a long range in realistic conditions of
use.
Compared to conventional
combustion engines, the electric drive of the "C evolution" also offers
significant advantages at low speeds in particular.
Thanks to elaborate power
electronics settings, the alternator offers the rider an instant,
spontaneous response. There are no delays in torque build-up at all as
are typical in combustion engines due to the clutch engaging and
disengaging.
At 8 kWh, the storage capacity
of the battery is extremely generous and ensures a range of up to 100
kilometres. This means that realistic zero-emissions riding in the big
city and in urban environments is no problem at all.
As in other areas, BMW Motorrad
has been able to draw on synergy effects with BMW automobiles here. For
example, the "C evolution" uses the same lithium-ion storage modules as
are installed in the BMW i3.
One of the main technological
challenges was optimum cooling of the high-voltage battery. On the one
hand it was necessary to avoid excessively low temperatures due to the
fact that the interior resistance of the cells is heavily increased as a
result, thereby reducing power.
The heat of the high-voltage
battery is dissipated by means of an aerodynamically optimised cooling
air shaft at the centre of the battery casing through which there is a
constant flow of air. To ensure optimum heat dissipation, the battery
base has longitudinally arranged cooling ribs.
The system also processes
information from the brake system and decides whether energy should be
recuperated and how much recuperation torque is to be applied to the
rear wheel if required.
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