|The Citaro G BlueTec Hybrid urban bus.|
The Citaro G BlueTec Hybrid, announced in 2007 (earlier post), is a series-hybrid articulated bus featuring a downsized diesel engine as the genset to provide power for a 19.4 kWh lithium-ion battery pack located on the roof. The Citaro hybrid uses four 80 kW electric wheel hub motors on the center and rear axles of the vehicle, with total output of 320 kW.
The engine applied in the hybrid is a compact 4-cylinder Euro 4 engine with a cubic capacity of 4.8 litres and an output of 160 kW (218 hp) at 3,200 rpm with maximum torque of 810 Nm at 1,600 rpm. This replaces the 12-liter in-line six-cylinder engine of conventional articulated buses. As a result, the engine weight is reduced from around 1,000 kg (2,200 pounds) to 450 kg (992 pounds) or so.
The battery pack is recharged by regenerative braking as well as the 160 kW generator. When approaching a bus stop, at standstill and when accelerating away from the stop, the hybrid bus is able to operate under electrical power alone. The aim is for the Citaro G BlueTec Hybrid to cover around half of a demanding inner-city route under electric power alone, without the diesel engine running.
Daimler anticipates that the hybrid will offer 20% to 30% lower fuel consumption than conventional diesel Citaros.
The Citaro hybrid bus will shortly enter field trials with public-transport operator; a small production series is planned for 2009.
Daimler is the top-seller of hybrid buses in the world at this point, with sales of some 2,600 hybrid buses to date by its Orion brand in the US and Fuso in Japan.
The DEKRA environmental prize is oriented towards the principle of sustainability and is awarded to projects, measures or initiatives which make a far-reaching and innovative contribution to protecting the environment. The assessment focuses on mobility, in particular improving the transportation of people and goods. DEKRA selected ten projects from a long line-up of potential candidates and a panel of expert judges made up of environmental and traffic scientists and trade journalists.