The new Setra S 531 DT double-decker bus of the TopClass 500 sets new standards in its class. With superlative aerodynamics, this impressive touring coach is all set to establish new fuel efficiency records in its segment. With its flexible lower deck, it covers the entire scope of applications in touring and regular services. The interior boasts an impressive standard of comfort. Finally, the use of Active Brake Assist 4 and Sideguard Assist on board the new double-decker bus will mark the world premiere for these assistance systems in the bus and coach segment.These systems further enhance the already high standard of safety. All of this is cloaked in a fascinating design with its own distinct stamp.
The very highest standards of safety thanks to innovative flair and Group technology – the premium brand’s new double-decker comes as standard with features such as long-life all-LED headlamps which are kind on the eyes. The emergency braking system Active Brake Assist 4 (ABA 4) – another standard feature – is being introduced in the bus and coach sector for the first time ever on board the S 531 DT. In addition to the previously available functions – maximum full-stop braking in response to stationary
objects and obstacles moving ahead of the vehicle – it now also incorporates pedestrian detection with automatic braking response. This enables the driver to avoid a collision by means of maximum full-stop braking or a steering manoeuvre.
Another world premiere in the bus and coach segment is the use of Sideguard Assist to combat the problem of blind spots. This employs radar sensors to monitor the lane to the right of the bus along the vehicle’s entire length. When making a turn, it alerts the driver to pedestrians, cyclists as well as stationary obstacles in the path of the turn by causing a lamp to light up in the exterior mirror on the co-driver’s side and by providing haptic feedback in the form of the driver’s seat vibrating. When not driving in urban areas, the Sideguard Assist furthermore doubles as a Lane Change Assist system as the monitored zone is extended beyond the vehicle’s own length at higher speeds by as much as five metres at the front and 15 metres at the rear.
The new Setra double-decker is the first touring coach in the product range of Daimler Buses to be equipped with a fire extinguishing system in the engine compartment as standard.
The new double-decker bus is tailored for optimum aerodynamics from front to rear. Literally from front to rear, as windscreens with a pronounced curvature and large edge radii allow the air to flow around the vehicle with minimal resistance at the front, while at the rear recesses and break-away edges guide the airflow in a controlled manner.
Powered by the OM 471 in-line six-cylinder engine with a displacement of 12.8 litres continues to produce an output of 375 kW (510 hp) while delivering a formidable torque of 2500 Nm. Long maintenance intervals of up to 120 000 km for engine oil changes and 360 000 km for initial cleaning of
the particulate filter (every 240 000 km thereafter) lower costs and cut downtimes. The engine is partnered by the GO 250-8 PowerShift fully automated eight-speed bus transmission. The features of this perfectly stepped unit include fast and barely perceptible gear changes and a crawl function for delicate manoeuvring. The engine’s power is transmitted to the RO 440 bus drive axle, which has a low-friction design so that it operates more economically and quietly – a key factor particularly on the lower deck of the double-decker bus. A trailing axle with independent wheel suspension continues to be fitted to enhance ride comfort, improve handling and lower the vehicle’s weight.