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English   Mercedes Citaro G BlueTec Hybrid
07.08.2009 von admin

Diesel/electric hybrid bus: a logical step on the way to fuel-cell drive

A close look at the hybrid-drive Citaro reveals it to be a logical step on the way to an emission-free fuel-cell-powered urban regular-service bus of the future. For example, the hybrid-drive Citaro already features a suitable electric drive unit, along with an energy store in the form of batteries. In principle, the diesel engine would simply need to be replaced by fuel cells when the time comes. The generator and the diesel and AdBlue tanks could then be dispensed with and the hydrogen tanks could be mounted on the roof in the usual way in the area over the front axle.

These are relatively minor changes from the design and manufacturing point of view but they would allow the bus to operate with virtually zero emissions in urban areas. This Zero-Emission Vehicle would emit no particulates, nitrogen oxides or CO2, and would also be even quieter in operation.

Deliveries scheduled from 2009

[BLOCK]With the Citaro G BlueTec Hybrid having successfully completed regular winter testing in the Arctic Circle, deliveries of customer vehicles are scheduled to begin from the end of 2009. An ambitious and closely related project is to make the diesel/electric urban hybrid bus an economical proposition for the operator. With the present small production volumes, the cost-effectiveness threshold has not yet been reached, despite the improvements of up to 30 percent in fuel efficiency. Ultimately the success of hybrid vehicles will depend not only on advances on the manufacturing side but also on the willingness of the public to recognise and support the ecological benefits of the concept.

Daimler: 40 years of hybrid buses

Mercedes-Benz and the Daimler Group have more extensive, and longer, experience with hybrid buses than any other manufacturer in the world. Daimler-Benz AG presented the world's very first hybrid bus at the Frankfurt Motor Show in 1969. It was based on an eleven-metre urban regular-service version of the
Mer­cedes-Benz OE 302. The DC electric traction motor developed a steady-state output of 115 kW (156 hp) and a peak output at low speeds of 150 kW (204 hp). The traction motor was powered by five underfloor battery blocks, whose 189 cells produced a total system voltage of 380 V and had an energy capacity of 91 kWh. This gave an operating range in regular service of approximately 2.5 hours. The batteries had a weight of 3.5 t.

The bus was also fitted with a 3.8-litre four-cylinder diesel engine developing a maximum output of 48 kW (65 hp). This unit, which operated fuel-efficiently and at constant rpm and was transversely mounted in the rear of the vehicle, was acti­vated to provide additional power when operating on the outskirts of town. This vehicle already featured an electric brake for braking-energy recuperation.

Mercedes-Benz OE 302 - 1969

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