Mercedes-Benz presents the new generation of the CL-Class – the epitome of luxury coupés. The new-generation CL-Class consolidates its position as an automotive masterwork and a technology platform of the Stuttgart-based company with the most advanced assistance and protection systems. These highly perceptive assistants convert the Mercedes model into a “thinking” partner that can see, feel and react instantly if it detects a hazard, acting autonomously to prevent accidents or to mitigate their effects. The trailblazing driver assistance systems in the CL-Class are based on state-of-the-art radar, camera and sensor technology.
Thus, in the new-generation CL-Class Active Lane Keeping Assist celebrates its premiere (at the same time as in the S-Class). If the vehicle threatens to cross a continuous lane marking line, the system actuates an electric motor in the steering wheel, causing it to vibrate briefly – giving the driver a discreet but effective warning hint to countersteer immediately. The active system springs into action if the Mercedes coupé unintentionally crosses a continuous lane marking line to the right or to the left. In this case, it intervenes by gently braking the wheels of the opposite side of the car, helping the driver to stay in the lane. In order to do this Active Lane Keeping Assist avails itself of the ESP® Electronic Stability Program.
Active Lane-Keeping Assist evaluates information provided by a camera mounted on the inside of the windscreen. It identifies the contrast between the road surface and the lane marking lines. In addition to this, using radar the system scans the side of the roadway for crash barriers and other roadway edge markings. This Mercedes assistance system also evaluates the driver’s actions and can thus reliably determine whether the car is departing from the lane intentionally or not. For this reason, there is no warning if the driver accelerates hard just before overtaking or when accessing a motorway, or if he brakes hard or steers into a curve.
Targeted brake actuation: active Blind Spot Assist
A further innovation Mercedes-Benz offers for the CL-Class is active Blind Spot Assist, a system that makes use of a multi-stage warning concept. If it detects that a change of lane would be too dangerous, it warns the driver by displaying a red triangle in the glass of the exterior mirror. Close-range radar sensors monitor the area immediately to the side and to the rear of the car. If the driver disregards this warning and, for example, actuates the turn indicator, an audible warning also sounds. If the driver continues to ignore the warnings and comes dangerously close to a vehicle in the neighbouring lane, a novel feature of the system acts: a corrective braking intervention via ESP® on the wheels of the opposite side of the vehicle. This causes a yaw movement about the car’s vertical axis due to the unequal distribution of the braking forces. If despite this course correction an accident cannot be avoided, the active Blind Spot Assist system can reduce the consequences of a collision through the brake actuation.
Assistants to see and be seen better
Adaptive Main Beam Assist is another standard-fit system featured by the CL-Class. This camera-based system can recognise oncoming vehicles or vehicles ahead with their lights on, and then controls the headlamps to ensure the best possible beam range without dazzling other road users. In addition, Mercedes-Benz offers the Night View Assist PLUS system for the CL-Class, featuring a special infra-red camera for pedestrian detection: as soon as the system detects pedestrians on the road ahead, these are highlighted additionally in the display, in order to catch the driver’s attention better.
The images supplied by the windscreen camera are also used by the new, optional Speed Limit Assist, which recognises speed limit signs in passing and shows the relevant speed limit in the central display and on the navigation system’s map display.
For the new-generation CL-Class, Mercedes-Benz has also improved the long and medium-range radar used by Brake Assist (BAS PLUS) and DISTRONIC PLUS proximity cruise control.
An “electronic crumple zone”: the PRE-SAFE® Brake
Mercedes-Benz also offers another radar based system for the luxury coupé as a component of the driver assistance package PLUS in the form of the PRE-SAFE® Brake. If the driver is distracted and fails to recognise the imminent danger of a rear-end collision or the warning signal of an assistance system, this system can intervene and brake the vehicle independently. If the driver fails to react even after automatic, partial braking action, this most recent development stage of the PRE-SAFE® Brake activates the maximum braking pressure around 0.6 seconds before what it now recognises as an unavoidable collision — an emergency braking action that can significantly mitigate the severity of the impact. The PRE-SAFE® Brake thus acts as a kind of “electronic crumple zone”.
Warns driver of overtiredness: ATTENTION ASSIST
Overtiredness is one of the most common causes of accidents. This is why Mercedes experts have developed the ATTENTION ASSIST system which forms part of the standard equipment of the new generation CL-Class. As the vehicle is being driven, the system continuously evaluates more than 70 different parameters in order to identify driver drowsiness and provide a warning before the dangerous microsleep phase begins. Observing the driver’s steering behaviour has proved to be a particularly strong indicator: several years of practical research by Mercedes-Benz have shown that drowsy drivers make minor steering errors which they often correct very rapidly in a characteristic way. This steering behaviour is recognised by a special steering angle sensor. Observing the driver’s eyes cannot always provide conclusive evidence of sleep since many drivers can experience micro-sleep with their eyes open.
Active Body Control reduces the effect of a crosswind
The CL-Class also meets the highest standards in terms of driving dynamics and agility. This is in part thanks to Direct-Steer, with a steering ratio that varies with the steering angle, and modified Active Body Control (ABC) with crosswind stabilisation (standard for CL 500 BlueEFFICIENCY and CL 600). This latest stage in active body development modifies the wheel load distribution via the ABC spring struts within milliseconds, depending on crosswind direction and intensity, to the extent that it can largely compensate the effects of the crosswind.
The Active Body Control suspension system with which Mercedes-Benz ushered in new dimensions of driving dynamics in the preceding C 215 model series in 1999, is unique worldwide as it not only regulates roll, but pitching and squatting movements as well, ensuring a perfect harmony of comfort and handling stability. Since the introduction of this innovative system, engineers in Sindelfingen have continuously improved on it, so that eleven years later it still marks the summit of automotive engineering. In addition to crosswind stabilisation, the new suspension features an energy-optimised hydraulic pump that takes part of the burden off the engine, contributing towards reducing fuel consumption.
Additional safety and agility at the physical limits is provided by the standard-fit Torque Vectoring Brake in the new-generation CL-Class – targeted, one-sided braking intervention at the inside rear wheel when cornering. This enables the luxury coupé to turn into the bend under precise control with even greater agility.
On-board infotainment: the most advanced multimedia technology
In line with its serene character and claim to be a technological masterwork, the CL-Class also sets standards where onboard infotainment is concerned. Thus, the Stuttgart automotive manufacturer equips its flagship model with the new SPLITVIEW technology for the COMAND control and display system centrally located in the centre console. This innovative display concept allows the driver and front passenger to view different contents simultaneously on one and the same screen. While the driver e.g. uses the map-based navigation system, the front passenger can be watching a film on DVD.
The standard COMAND control and display system with Bluetooth®, USB and SD card interfaces offers customers the possibility of exporting their stored data to other vehicles and multimedia devices. It is also possible to transfer and update navigation data. In the glove compartment Mercedes-Benz also integrates a Media Interface as standard – the interface is for mobile audio and video devices – devices such as the iPod® and every other possible customer device.
COMAND also includes a Europe-wide navigation system whose data are stored on a 40-Gigabyte hard disc, enabling extremely rapid route calculation. Another factor contributing to a high level of navigation comfort is the detailed three-dimension map display including updates free of charge for three years. For musical entertainment COMAND provides a radio, a CD/DVD player with MP3 function, an equalizer with speed-dependent volume control and the MUSIC REGISTER with a 7.2 GB hard disc which stores around 2500 digital music files in MP3, AAC or WMA format. The system recognises music files played on CD, DVD or from the MUSIC REGISTER using its stored Gracenote® database, and shows the title, album and performer in the colour display. Another new function, Music Search, enables CL-Class drivers and passengers to search SD memory cards, USB sticks, CDs and DVDs for specific music titles and performers.
The Navigation package also includes the latest-generation LINGUATRONIC voice control system that controls the navigation, telephone and audio devices via whole-word input. Benefit: the driver no longer needs to spell out his commands but simply speaks the corresponding words as whole words when entering the destination or choosing a radio station or a music title from the Music Register, or when calling up a name from the phone book.
The further developed surround sound system with Discrete Logic7® technology developed by Mercedes-Benz together with audio specialists Harman Kardon® delivers an outstanding performance with three-dimensional sound as a natural 360-degree musical experience for all passengers of the CL-Class. Mercedes-Benz offers the surround sound system together with SPLITVIEW and a six-disc DVD changer as part of the Entertainment Package (standard for CL 600).