Transport company De Lijn will introduce the articulated hybrid buses as a transitional measure between the present old high-floor trolleybuses and the future tramcars foreseen on a part of present trolley line. The city wants to increase its experience with articulated hybrid buses so it can make an informed decision when buying more buses. There are several advantages to hybrid buses, such as the fact that they recuperate braking energy towards energy storage equipment such as super capacitors or batteries, which is used again while accelerating. As a result, the diesel motor can be smaller than the classic articulated diesel buses. This ‘downsizing’ reduces the weight of the engine from approximately 1000 kg to around 450 kg.
Moreover, the diesel motor can run over a narrow and optimal number of revolutions per minute range, close to its peak efficiency. The torque curve of the hybrid-bus engine is therefore tailored to frequent steady-state operation, for optimal emissions performance and fuel efficiency. The diesel engine-generator can be sound-insulated better than classic diesel buses, and is much quieter.