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2018 Mercedes eCitaro



According to the manufacturer, the Citaro with 50,000 units is the best-selling city bus in the world. It has been around for a long time with a natural gas engine, since recently also as a retrofittable 48V hybrid (New: + € 10,000-15,000). Noteworthy here is the storage in capacitors instead of batteries.

Still in 2018 it should be orderable fully electric. Its maximum possible capacity matches to that of the one just presented eActros. Only the range is specified by the manufacturer with 150 instead of 200 km. A city bus makes additional demands on the air conditioning and especially the heating of the interior.

A city bus needs twice as much energy at -10° C as without heating. That is why often only one of the two double doors is opened in extreme cold. A heat pump, possibly even operated by far the least problematic CO2, is a must in view of the many batteries. Nevertheless, additional frost and wall heating with fan are necessary.

It should be installed a proper heat management. For this purpose, it is determined e.g. the number of passengers based on the axle loads and thus the need for fresh air in the hot air. With many human heat sources in the bus, the heating can be taken back a little.

Even a pre-heating in the depot is thought, possibly even with over-conditioning. The driver starts then driving in swimwear. But, joking aside, the driver will in future receive a workplace with more temperature stability as the passengers with their mostly temperature-adapted clothing. If a need arises later here, it is still possible to use a diesel-operated additional heater.


Even with the electric trucks for the last few miles (deliveries) is heard the possibility of interim charging. That would of course also be attractive for a city bus. In general, like the eActros, it needs a special charging technology that is not compatible with existing passenger car solutions. At most, it could be attached to particularly fast systems (Combo 2) with two charging cables simultaneously.

You notice, despite the here with 2.5 tons specified battery pack it tweaks at all corners. After all, in the Citaro are so possible still up to 80 passengers. At the bus you still have a further ace up your sleeve by a possible consumer of electricity. So if there are major breaks at stops, then can be made possible from the front part of the roof a connection to a corresponding installation at the stop as an intermediate charge. You realize, switching to electric city buses is not just a financial problem, but more of a logistical problem.


Somewhat confusing is perhaps the designation at the eActros of a 'wheel hub near electric motor'. In the picture, incidentally suspiciously similar to one of ZF, one sees that the outer planets and disc brakes are retained and the engines are further offset inwards. They are equal in terms of power and torque, which gives the Citaro a good report, because as a rule, bus engines can be designed a little weaker. 03/18






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