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Emergency braking can save lives. But many drivers then step on the brake pedal quickly, but not powerfully enough - that is what Mercedes-Benz engineers found out in the early 1990s when they tried out the company's own driving simulator. Your answer is the BAS Brake Assist, also known as “Brake Assist”. The brand introduced it on November 25, 1996. BAS is one of the keys in the chain of important safety developments from Mercedes-Benz.
Mercedes-Benz Brake Assist BAS
- A key innovation in the brand's long tradition of important security developments
- Networking with other systems
- Series of tests in the driving simulator clearly demonstrate the effectiveness
From December 1996, the brake assistant was initially part of the standard equipment of the S-Class (140 series) and SL (R 129). The other series will also gradually receive the assistance system. How it works: The BAS interprets a certain speed at which the brake pedal is pressed as an emergency situation and builds up the maximum brake force boost within a fraction of a second. This significantly shortens the braking distance - at 100 km / h on a dry road, for example, by up to 45 percent. In turn, Mercedes-Benz examines its effect in the driving simulator: the brake assistant can reduce or even prevent rear-end collisions. And it makes an effective contribution to pedestrian protection. In a series of tests, 55 car drivers were driving through a town at 50 km / h when suddenly a child ran onto the road. Only emergency braking prevents the accident.
How far system networking had progressed at that time, shows that the brake assistant works with data from the ABS anti-lock braking system - as does the traction control system ASR, the automatic locking differential ASD, the electronic stability program ESP®, the electronically controlled automatic transmission, the adaptive cruise control DISTRONIC and many others more. Depending on the function and task, additional sensors and controls are used. The control electronics of ABS, ESP®, BAS and ASR are combined in one control unit.
Another example of networking: In the first year of the Brake Assist system, other safety developers at Mercedes-Benz are already working on the PRE-SAFE® preventive occupant protection system. This uses the BAS information that an accident situation is imminent as one of several indicators: PRE-SAFE® immediately prepares the interior for a possible impact by, among other things, adjusting the seat backs for an optimal seat belt effect and closing the sunroof. PRE-SAFE® celebrated its premiere in the S-Class of the 2002 series in 220. The integrated system finally puts an end to the previously customary separate consideration of active and passive safety.
The BAS brake assistant has additional functions
The next BAS bonus follows seven years later: In the S-Class of the 2005 series presented in 221, Mercedes-Benz has expanded the Brake Assist system into a predictive system that supports the driver in critical situations even more effectively than before. Radar technology makes it possible: It records the distance to the cars in front, warns the driver if the distance is too short and calculates the necessary braking assistance in the event of an impending collision.
If traffic comes to a standstill and the driver actually has to step on the brake pedal, the BAS PLUS brake assistant builds up the brake pressure calculated for the respective situation at lightning speed. BAS PLUS uses two radar systems: A newly developed short-range radar using 24-gigahertz technology covers the area in front of the vehicle with an opening angle of 80 degrees and a range of 30 meters. In addition, the 77-gigahertz radar from DISTRONIC scans three lanes of a motorway up to a distance of 150 meters with an opening angle of nine degrees. And again, the developers test the system in the driving simulator. The impressive result: if the accident rate in tests with conventional braking technology averages 44 percent, it is reduced by three quarters with the help of the BAS PLUS brake assistant.
The development remains brisk. In 2006, pioneering technical innovations such as the active night vision assistant and the further developed DISTRONIC PLUS distance control system as well as the BAS PLUS brake assistant for PRE-SAFE® brakes with autonomous partial braking are combined. Mercedes-Benz also offers similarly networked systems for its commercial vehicles, for example Active Brake Assist in the Actros heavy-duty truck. In 2013, the PRE-SAFE® Brake received pedestrian detection, and BAS PLUS also received the Intersection Assistant. The PRE-SAFE® Brake is now called Active Brake Assist, is standard equipment and reacts to cars, cyclists and pedestrians with an autonomous emergency braking if the driver does not intervene.
And today? Brake systems remain essential for road safety. In addition, emergency braking systems that are triggered on the basis of the detection of the surroundings are an important basis for highly automated vehicles and thus an essential part of the vision of accident-free driving.
Of course, that wasn't the end of it!
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