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Hybrid Citeas for HEAG mobilo Darmstadt

In April 2011, VDL Bus & Coach delivered three hybrid Citeas to HEAG mobilo in Darmstadt (Germany). The hybrid Citeas are the result of the ‘Green Move’ development project, a collaborative initiative of transport company HEAG mobilo, Darmstadt University of Technology, Vossloh Kiepe and VDL Bus & Coach. ‘Green Move’ was initiated in connection with and as part of the national policy in which certain regions serve as role models for the application of electric mobility. The region of which Darmstadt is a part, Rhein-Main, is one such model region.

Lower emissions and quieter
The objective of the ‘Green Move’ development project is to utilise serial hybrid technology in such a way that optimal savings potential will be achieved relative to buses driven in the traditional manner. The ambition has been to significantly reduce fuel consumption and the emissions of CO2, fine particulates and NOx. This is achieved by using an electric drive for the Citea SLF-120/hybrid. The diesel engine drives a generator that produces the electrical power. This electrical power is stored in supercaps for later use or is used immediately to power the electric motors installed in the rear axle. The braking energy is also recovered and stored in these supercaps so the energy can be used again for driving. This implies that the diesel engine can be intentionally shut off, at a bus stop or during standstill for instance, and that only the electric drive is used during acceleration from a stop. This makes it possible to drive portions of a route using just electric power, producing zero emissions. These sections can even be preprogrammed, through a system that utilises GPS. An additional, and certainly not unimportant, environmentally-responsible aspect is that far less noise is produced.

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Deployment
First the drivers will be trained, because their driving and braking behaviour has a great impact on the electrical energy storage. Then the buses will be put in service. Various tests will be performed and information will be collected concerning operational characteristics and achieved sustainability effects. To make it possible to interpret and compare the data, the same information will be collected from the Citea CLF-120/310, a traditional diesel bu

Technology
The Citea SLF-120/hybrid buses for HEAG mobilo have been built with components from renowned automotive suppliers. Vossloh Kiepe serves as the system integrator with overall responsibility for the generator, supercaps, power electronics and energy management. The small 4 cylinder diesel engine is built by Cummins, and for the hybrid versions of the Citea the choice has been made for an optimal driveline with low emissions (standard EEV emission level), a low specific fuel consumption and the lowest possible weight. The rear axle, from ZF, includes two electric motors, which are integrated into the axle. The combination of these components has led to a perfectly integrated system that has no negative effects on the interior of the bus. In addition, the added weight has been kept to an absolute minimum.
 
HEAG mobilo
HEAG mobilo is a leading mobility service provider in Südhessen (a region in the German province of Hessen) committed to providing attractive and efficient public transport in Darmstadt and the surrounding areas. The company’s activities include the deployment of buses and trams and the provision of basic infrastructural services such as the regional traffic centre.

Valkenswaard, May 2011


VDL Bus & Coach bv
Marleen van Zeeland
Communications
+31 (0)40 208 44 14
m.van.zeeland@vdlbuscoach.com

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