Automotive Intelligence - the web for automotive professionals and car enthusiasts
November 13, 2008
By way of example, new camera-based assistance systems help the driver by keeping the car safely on track, detecting speed-limit signs, controlling the headlamps in line with the current driving situation and enhancing visibility in the dark.
The new E-Class will be the world's first car to feature headlamps that adapt automatically in line with the current driving situation. Adaptive Highbeam Assistdetects oncoming vehicles or moving vehicles in front with their lights on and adjusts the headlamps continuously so as to always provide the best possible headlamp range – without dazzling other motorists. In this way, the low-beam range can be increased from its current level of 65 metres to up to 300 metres.
If the road ahead is clear, the system switches to high beam with a minimum of fuss. This Mercedes development is therefore fundamentally different to conventional systems of this type, since the latter merely switch between low beam and high beam.
Adaptive Highbeam Assist: the best possible light in any traffic situation
Tests show that motorists who use Adaptive Highbeam Assist are safer on the road in the dark because they see pedestrians, cyclists or obstacles on the road up to 150 metres earlier than is the case with conventional low beam. What's more, the system helps to relieve driver stress as there is no longer any need to repeatedly flick the stalk on the steering wheel. So the driver can concentrate more on actually driving the car. Once activated, Adaptive Highbeam Assist always provides the best possible headlamp range.
Mercedes-Benz has further developed its Night View Assist system, which illuminates a long stretch of the road ahead using invisible infrared light. The second generation of this system features a special pedestrian detection function: as soon as the system detects pedestrians ahead of the car, they are highlighted on the display.
Another new assistance system developed by Mercedes can prevent accidents caused by the car leaving its lane. More than a third of all road users killed in Germanyare involved in this type of accident. This is why Mercedes-Benz has developed a "forward-looking" system for safe motoring called Lane Keeping Assist. Its camera monitors the line taken by the car and the driver's control inputs on a permanent basis, allowing the system to detect when the car leaves its lane unintentionally and if there is a risk of an accident. If this is the case, the system warns the driver in plenty of time, prompting them to counter-steer by making the steering wheel vibrate with a series of short, clearly discernable pulses.
A further new assistance system reminds the driver of the current speed limit in force: the camera on the windscreen detects speed-limit signs as the car drives past them and then indicates the speed limit on the display in the speedometer. The driver therefore remains fully aware of the current speed limit, enabling them to adapt the car's speed accordingly. The display goes out as soon as the speed limit is lifted.
ATTENTION ASSIST: drowsiness detection system fitted as standard in the E-Class and S-Class
Thanks to a new technology, future Mercedes models will have a keen sense of their drivers' awareness. The aim is to detect driver drowsiness in plenty of time so as to warn them before they fall asleep momentarily. According to scientific studies, around a quarter of all serious motorway accidents are caused by driver drowsiness.
The new ATTENTION ASSIST system is equipped with highly sensitive sensors which monitor the driver's behaviour, the current driving situation and over 70 other parameters. By doing this, the system is able to detect when the driver's concentration starts to slip. This permanent form of monitoring is important for detecting the floating transition from awakeness to drowsiness and for warning the driver at an early stage. In addition to the speed, lateral acceleration and longitudinal acceleration, the system also detects use of the turn indicators and pedals as well as certain control inputs and external influences such as side winds or road unevenness, for example.
Field tests carried out by the Mercedes engineers over a period of several years, involving over 550 participants to date, show that drowsy drivers make minor steering errors that are often corrected quickly and abruptly. These are detected by a highly sensitive steering wheel angle sensor. If ATTENTION ASSIST detects typical indicators of drowsiness based on these and other data, it warns the driver by emitting an audible signal and flashing up a message on the display: "ATTENTION ASSIST. Break!"
ATTENTION ASSIST will be specified as standard for the new E-Class and the model year 2009 S-Class.
PRE-SAFE®: tensioning of the seat belts before an unavoidable accident
Further standard equipment Mercedes-Benz offers for these models includes the PRE-SAFE®anticipatory occupant protection system. Based on information received from sensors, it identifies situations that might turn into accidents and instinctively activates preventive occupant-protection measures, allowing the seat belts and airbags to deploy with maximum effect in the event of an impact. PRE‑SAFE® therefore bridges the gap between active safety and passive safety; it is networked to Brake Assist and the Electronic Stability Program (ESP®), whose sensors recognise potentially dangerous driving situations and then transmit this information to the electronic control units within milliseconds.
In another first, Mercedes-Benz will also be using the information provided by the short-range radar to trigger the seat belt tensioners at the very last moment before an unavoidable collision, thus greatly reducing the forces exerted on the driver and front passenger during the crash.
Radar technology: sensor with medium-range detection capability and greater range
DISTRONIC PLUS and Brake Assist PLUS – Mercedes assistance systems based on sophisticated radar technology – are highly effective at helping to prevent accidents. Analysis of accident-research data has shown that this technology can prevent a fifth of all head-to-tail crashes in Germany on average. On motorways, the accident rate can be reduced by as much as 36 percent.
Mercedes-Benz has further enhanced the radar technology for the new E-Class and the model year 2009 S-Class. The newly developed long-range radar sensor will have a range of 200 metres instead of 150 metres as previously. In addition, the sensor now has medium-range detection capability, allowing monitoring of the area up to around 60 metres ahead of the car with a 60-degree beam width. This new technology enables even more accurate monitoring of the traffic situation in front of the car and even better detection of dynamic events such as a car in front swerving suddenly. The two wide-beam short-range radar sensors (80-degree beam width) with a range of around 30 metres are still employed.
With a total of seven airbags fitted as standard, not to mention seat-belt tensioners, belt force limiters and NECK-PRO crash-responsive head restraints, the new E‑Class will offer an even more extensive package of safety equipment than its predecessor. Self-adaptive belt-force limiters in the rear, which adapt automatically to suit the size of the rear passengers, will be introduced for the first time in autumn 2009.
Pedestrian protection: new E-Class with active bonnet fitted as standard
Mercedes-Benz is continuing its long-standing and very successful commitment to protecting those road users who are most at risk. Standard equipment for the new E-Class includes an active bonnet, which greatly reduces the risk of injury to pedestrians. In the event of an accident, a system of springs raises the rear section of the bonnet by 50 millimetres within milliseconds, thus enlarging the deformation zone. One special feature of this Mercedes system is its reversibility: drivers can reset the active bonnet themselves without having to visit a workshop.
(Nov. 13, 2008)