BMW release press info on a new electric innovation, introducing the new BMW E-Scooter.
European Press Release
Space is becoming increasingly scarce in the major conurbation
centres and traffic density is growing continuously. Political and
social conditions are changing. All these factors coalesce in
increasing demands in terms of private transportation. The
concept vehicle BMW E-Scooter with electric drive provides an
innovative look at changing urban mobility needs.
While the currently available, purely electrically-powered scooters
have been almost exclusively used inside towns and cities to date due
to their performance and range, which makes them suitable for short
distances only, the concept vehicle BMW E-Scooter offers a much
broader spectrum of use.
High range and excellent performance figures.
Since it was conceived as a future-oriented vehicle for commuting
between urban areas and the city centre, therefore attracting funding
from the German Federal Ministry of Transport, Building and
Urban Development, there were two main requirements for its
development: dynamic figures comparable to those of a maxi scooter
with a combustion engine and a high range in realistic conditions of use.
The concept vehicle BMW E-Scooter provides the necessary sustained
output and maximum speed for safe and reliable overtaking on
urban motorways and also when carrying two people. It is also
easily capable of managing hill starts on steep slopes with a pillion passenger.
The development study also has the necessary maximum output to be
able to achieve acceleration figures within the important 0 -
60 km/h range, which are at the level of current maxi scooters
powered by a 600 cc combustion engine.
The high storage capacity of the battery allows a daily driving range
of over 100 kilometres. In this way, the BMW E-Scooter concept vehicle
provides a long-term, zero-emissions urban and suburban travel option
which is suitable for everyday use.
Fast charging at conventional power sockets.
The E-Scooter concept vehicle's battery is charged at regular
household power sockets as found in Europe, the USA, Canada and Japan,
so no special charging station is required. When the battery is
completely flat, the charging period is less than three hours.
However, practical experience has shown that the battery rarely runs
out completely, so charging times are generally shorter.
Unlike existing maxi scooters with combustion engines, the concept
vehicle does not have a main frame. Instead, the aluminium battery
casing — which also contains the electronic system required for
battery cell monitoring —takes over the function of the frame.
The steering head support is connected to it, as is the rear frame and
the left-hand mounted single swing arm with directly hinged,
horizontally installed shock absorber.
Electric machine, power electronics and charging device.
Due to its high output, the BMW Motorrad development study has no hub
motor with direct drive or planetary gearbox. Instead, the
high-performance electric machine is mounted behind the battery
casing. The secondary drive consists of a toothed belt from the
electric machine to the belt pulley mounted coaxially on the swinging
fork pivot with drive pinion. From here, power transmission occurs via
roller chain to the rear wheel. When the E-Scooter is decelerated in
trailing throttle or when braking, the energy released is recuperated,
thereby increasing the vehicle's range by between 10 and 20 per cent
depending on driving profile.
The electrical components required for the electric drive are
installed on the top of the battery casing. The external battery
electronics system permanently collects and monitors data such as the
temperature and voltage of the battery cells, both during travel and
while charging. The power electronics acts as a control system and
controls the electric machine. The charging device includes a charge
cable which allows the battery to be recharged at a conventional
household power socket. In addition to the other components like an
ISO insulation monitor, high-voltage indicator and a high-voltage
distributor, a DC-DC converter is included. It is required to change
high voltage to low voltage power to supply the 12 volt vehicle supply
and especially for the control units.
During travel, the electric machine and power electronics are
liquid-cooled, as is the charging device during charging. An electric
coolant pump ensures coolant circulation through the radiator. While a
coolant is commonly used for the battery in electrically powered cars,
the E-Scooter concept vehicle uses an air cooling system in order to
BMW Motorrad is one of the very few motorcycle manufacturers to be
able to draw on its own experience and expertise in the automobile
field in the development of electrically powered vehicles. Synergies
are derived from the development of the BMW E-Scooter concept vehicle
not just in the ready availability of technical components but also in
the area of high voltage engineering and the associated safety
requirements. Here for the first time, standards established by the
leading automobile manufacturers relating to high voltage safety (>
60 volt) and functional reliability are being applied to a
two-wheel vehicle with electric drive.
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