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English   Setra S 531 DT
07.07.2017 von admin

Number one for safety: first bus worldwide to feature Active Brake Assist 4 and Sideguard Assist
  • Setra – tradition-bound to maximum safety
  • World first in the bus and coach segment: Active Brake Assist 4 brakes in response to pedestrians
  • World first in the bus and coach segment: Sideguard Assist provides warnings during cornering and turning off
  • Sideguard Assist also helps when changing lane

Buses are among the safest means of transport. Setra makes them even safer, the new Setra TopClass S 531 DT setting benchmarks with its assistance systems. The use of the Active Brake Assist 4 emergency braking system and Sideguard Assist on board the new double-decker marks the world premiere for these features in the bus and coach segment.

Setra – tradition-bound to maximum safety

ABS, ABA 4, ART, AtAs, BAS, DBL, ESP, TPMS and more besides – the scope of standard and optional equipment for the new Setra reads like an A to Z of the latest assistance and safety systems. This fits into a long tradition at Setra: in 1955 the brand was among the pioneers of independent wheel suspension on buses and coaches, in 1964 it was the first to introduce the retarder as a wear-free auxiliary brake and a few years later it championed disk brakes. Back in 1981 Setra was already optionally installing the ABS anti-lock braking system on all buses and coaches. In 1984 it became the first brand in Europe to fit ABS as standard. Introduction of xenon headlamps as standard in 2001 in the then new TopClass 400, followed in swift succession by the ESP Electronic Stability Program, adaptive cruise control, Continuous Braking Limiter, Lane Assistant and the Front Collision Guard – the highest safety standards courtesy of Daimler Group technology. Setra most recently introduced the option of integrated LED headlamps at the end of 2015.

As a result, the new double-decker buses even comes with LED headlamps as standard. The light from these headlamps is similar to daylight and is less tiring on the eyes. Their durability and their virtually undiminished luminous intensity throughout their service lives are additional benefits of relevance to safety.

Double-decker bus: with up to 83 passengers, safety is paramount

Active safety, i.e. accident prevention, is a prime concern for a double-decker bus with up to 83 passengers on board, hefty dimensions and a permissible gross weight of 26 tonnes. Should an accident nevertheless occur, driver and passengers benefit from the highest possible standard of passive safety. The previous Setra double-decker bus already benefited from a reinforced framework following its comprehensive overhaul in the autumn of 2015, thereby voluntarily meeting the requirements of the pendulum impact test in accordance with ECE-R-29. Setra furthermore provides rescue services with online rescue data sheets for all its buses and coaches.

Emergency braking system Active Brake Assist can save lives

The emergency braking system Active Brake Assist (ABA) is an outstanding assistance system. Its original version was introduced in the Setra TopClass 400 around ten years ago, since when it has benefited from ongoing further development. While the statutory advanced emergency braking system AEBS performs drastic braking to a standstill in a critical situation, the latest Active Brake Assist 3 (ABA 3) brakes the vehicle substantially earlier when stationary obstacles are encountered, applying maximum full-stop braking to bring the vehicle to a standstill. ABA 3 has been available for the Setra S 431 DT double-decker bus since 2015. Touring coaches with ABA 3 thus not only mitigate the consequences of a serious accident but are actually able to avoid such accidents, within the given physical limits. Setra installs Active Brake Assist 3 as standard if the customer orders the vehicle with the adaptive cruise control system, on whose radar system ABA 3 is based.

World first in the bus and coach segment: Active Brake Assist 4 brakes in response to pedestrians

A new chapter is now being written in the history of assistance systems: the Setra S 531 DT is the first bus in the world to feature the emergency braking system Active Brake Assist 4 with pedestrian detection – a further milestone in the development of assistance systems.

The outstanding feature of Active Brake Assist 4 is that it warns the driver of imminent collisions with moving pedestrians and simultaneously automatically initiates partial braking. It is the first system of its type worldwide to perform such functions. This enables the driver to avoid a collision by means of maximum full-stop braking or a steering manoeuvre.

Active Brake Assist 4 thus constitutes a further development of well-proven Active Brake Assist 3, incorporating an additional warning and partial braking to enhance the safety of pedestrians. Its mode of operation and displays correspond to ABA 3. Unlike when braking for moving and stationary obstacles, there is no warning cascade prior to partial braking for moving pedestrians: the acoustic and visual warnings occur at the same time as partial braking.

Long- and short-range radar systems detect pedestrians, cars and objects

The long-range radar of Active Brake Assist 4 detects vehicles and obstacles in a direct line in front of the bus up to a distance of 250 m and pedestrians up to a distance of 80 m. Motorcycles, mopeds and cyclists are detectable up to a distance in between these two ranges (160 m). The maximum opening angle is 18 degrees. The short-range radar has a range of 70 m. The wide opening angle of 120 degrees additionally enables Active Brake Assist 4 to detect vehicles and moving pedestrians at the sides of the area in front of the vehicle, whereby the range of vision is dependent on the topography, the course of the road, weather conditions and ambient influencing factors, such as pedestrians moving quickly into the traffic area or concealed pedestrians.

Active Brake Assist is able to detect moving pedestrians in virtually any traffic situation, for example if they cross the bus's lane, emerge from behind an obstacle or are moving along the vehicle's lane. Pedestrians are also detected within the range of the radar system when the vehicle turns off to the left and right. The warning and braking reactions to stationary and moving obstacles are effective across a speed range from 0 to 100 km/h, while the automatic warning and braking reactions of the pedestrian detection system apply up to a speed of 50 km/h.

The bus driver then decides on any further actions. The driver can override the system at any time as necessary, by means of a steering movement, kickdown or emergency braking, for example. If the driver does not brake firmly enough, the braking intensity of Active Brake Assist 4 takes precedence.

Multi-mode radar with improved range and performance

The basis for Active Brake Assist 4 with the additional pedestrian detection function is provided by a new generation of radar technology. This is also used in the current passenger cars and trucks from Mercedes-Benz, demonstrating the close cooperation within the group.

The advantage of a radar system is that it operates independently of the prevailing light conditions and also largely independently of weather conditions. Radar determines distances and relative speeds extremely precisely, and is also able to "see" at night and in rain and fog. Vehicles, pedestrians and objects are recognised on the basis of a radar signature. This involves analysis first and foremost of the form and reflection.

The new radar generation takes the form of electronically scanning multi-mode radar. This offers markedly improved range and performance. For the first time, the long-range radar now operates independently of the set driving level and is able to adapt continuously to changing inclination of the vehicle as a result of suspension or load statuses.

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