The world premiere of the new SL and two all-new hybrid models took centre stage on the Mercedes-Benz stand at the opening of the 2012 North American International Auto Show in Detroit. The new models from Mercedes-Benz delivered a strong impetus for the new automotive year and for the future of the brand as a whole – directly in the wake of the best sales year in company history. For the first time, the all-new SL Roadster is made almost entirely from aluminium and weighs up to 140 kg less than its predecessor thanks to intelligent lightweight design. The result is more agility and dynamic character combined with improved comfort and increased crash safety. The new BlueDIRECT engines are more powerful, yet up to 29 percent more fuel efficient than the engines in the outgoing model. More driving fun with even lower fuel consumption is also on offer from the two new E-Class hybrid models – the E 300 BlueTEC HYBRID is the world’s most fuel-efficient full-size car, consuming just 4.2 litres of diesel per 100 km (109 g CO2/km). The gasoline-powered E 400 HYBRID, which will be launched first in the USA, delivers fuel economy of 27 mpg (combined).
“In 2011 we sold more than 1.36 million cars worldwide – more than ever before. 2012 will see us push forward with our product offensive and repeat two things that worked extremely well last year – we will launch another six new models and we will set the bar even higher by making green cars cooler and cool cars greener,” said Dr. Dieter Zetsche, Chairman of the Board of Management of Daimler AG and Head of Mercedes-Benz Cars, at the NAIAS press conference. To back this up, Mercedes-Benz presented the sixth generation SL. Compared with its highly successful predecessor, the new model offers a considerable boost in sporting character and comfort and sets new benchmarks in the luxury roadster class. Plus, it comes with a full serving of everyday usability.
Classic proportions and outstanding aerodynamics
The stylish luxury sports car has classic proportions with a long hood and a compact cockpit set well back. Finely honed details and air vents with chromed fins from the dynamic tradition of Mercedes-Benz Design add visual emphasis to the SL legend.
Dr. Dieter Zetsche: “There are around 900 million cars on this earth and thousands of models. But there is but a handful of automotive icons. Our SL is one of them – it has class, it has style, it is the embodiment of comfort and luxury. But it combines all of that with an unbelievably sporty and dynamic character.”
Moreover, the new SL boasts outstanding aerodynamics. Alongside the lowest drag coefficient (cd = 0.27 in the SL 350), it also offers the lowest level of wind noise – almost on par with a closed saloon – as well as the very best airflow and noise characteristics with the top down.
“The new SL offers everything that defines an absolutely top-class premium roadster,” said Dr. Joachim Schmidt, Executive Vice President Mercedes-Benz Cars, Sales and Marketing. “It is two things rolled into one – a dynamic sports roadster and a luxurious coupé. Or, as we say, it is both athlete and connoisseur.”
Mercedes-Benz hybrid offensive with the E-Class
With its two new E-Class hybrid models, Mercedes-Benz is turning a new chapter in the brand’s core segment and thereby setting new benchmarks for full-size business saloons. The E 300 BlueTEC HYBRID, which is available as both a saloon and estate, sets new records with its efficiency. The world’s most fuel-efficient full-size model boasts exceptional fuel consumption figures (4.2 l/100 km) and outstanding performance. The four-cylinder diesel in the E 300 BlueTEC HYBRID delivers 150 kW (204 hp) and generates 500 Nm of torque. The electric motor develops 20 kW and 250 Nm.
The V6 spark-ignition engine in the E 400 HYBRID delivers 225 kW (306 hp) and generates 370 Nm of torque, plus a further 20 kW and 250 Nm from the electric motor. The fuel economy in accordance with American CAFE standards stands at 24 mpg city, 31 mpg highway and 27 mpg combined.
“This modular hybrid technology opens the way for us to add hybrid models to other model ranges in the near future,” said Prof. Dr. Thomas Weber, Member of the Board of Management of Daimler AG, responsible for Group Research and Mercedes-Benz Cars Development.“With a clear focus on the varying needs of the global markets, we can offer precisely those models that our customers are demanding. Alongside a considerable reduction in fuel consumption, the E‑Class hybrids are very impressive to drive – this is hybrid driving on a premium level.”
The E 300 BlueTEC HYBRID is initially planned for the European market, while the E 400 HYBRID will be launched first on the American market and later offered in further countries such as Japan and China.
Credits: Daimler AG
Copyright © 2012, Mercedes-Benz-Blog. All rights reserved.
Mercedes-Benz launches hybrid offensive: The world's most economical luxury-class model
Mercedes-Benz is opening a new chapter in its brand's core segment and at the same time setting new standards for luxury-class business vehicles: the E 300 BlueTEC HYBRID, available as a Saloon and Estate, impresses with new record values when it comes to efficiency. It boasts exemplary consumption levels (4.2 l/100 km[1]) as well as impressive performance: the 4-cylinder diesel engine of the E 300 BlueTEC HYBRID has 150 kW (204 hp) and 500 Nm. Combined with an electric motor producing 20 kW and 250 Nm, this results in a coherent overall concept. The E 300 BlueTEC HYBRID is the most economical luxury-class vehicle in the world.
The V6 petrol engine in the E 400 HYBRID produces 225 kW (306 hp) and 370 Nm, and is also supplemented by a further 20 kW and 250 Nm from the electric motor. The consumption figures based on the American CAFE standard are: City 24 mpg, Highway 31 mpg, Combined 27 mpg.
"With these two E-Class models we are now continuing our comprehensive hybrid offensive. The modular technology opens up a quick way for us to complement other model series with hybrid models", explains Professor Dr. Thomas Weber, Daimler Board Member for Group Research and Head of Mercedes-Benz Cars Development. "With a clear focus on the different requirements of the global markets, we are able to offer precisely the models which our customers want. The E-Class hybrids provide a clear reduction in consumption as well as a very impressive driving experience: they represent hybrid motoring at the premium level."
The new models do not require their passengers to have to compromise when it comes to space, however, whether in terms of the interior or the luggage compartment. And there are also additional benefits to the intelligent modular hybrid concept, which represents a comprehensive enhancement of the Mercedes-Benz S 400 HYBRID which has advanced to the position of clear market leader since 2009: no changes to the vehicle body are required, the hybrid module is both flexible and modular, thus allowing its use in other model series, and in addition to diesel and petrol variants there will also be right-hand drive variants. Meanwhile, the extra cost involved here is only moderate. The new hybrid models will be celebrating their world premiere at the Detroit Motor Show (14 to 22 January 2012) and will appear on the market over the course of the year. The E 300 BlueTEC HYBRID is initially planned to be launched on the European market, while the E 400 HYBRID will be made available on the American market first, followed by other countries such as Japan and China later.
The philosophy: increase efficiency without compromising comfort or use
The new hybrid models from Mercedes-Benz are part of the company's intelligent downsizing strategy which aims to make conventional models perform significantly more efficiently than ever before – without compromising when it comes to driveability or comfort. As part of this move, rather than focusing primarily on regular consumption, the engineers at the company have been examining exemplary consumption levels in everyday traffic. The notorious safety philosophy known as "Real Life Safety", which similarly highlights gains in safety under practical conditions rather than standard crash test results, is now being paired with "Real Life Efficiency".
Take the E 300 BlueTEC HYBRID by way of example: the hybrid model is based on the notoriously economical E 250 CDI, but exceeds it in terms of performance and undercuts in terms of fuel consumption by around 15 percent. The details are as follows:
- E 250 CDI: output of 150 kW, max. torque of 500 Nm, top speed of 242 km/h, acceleration from 0 to 100 km/h in 7.5 seconds, consumption of 4.9 litres of diesel/100 km, CO2 emissions of 129 g/km
- E 350 BlueTEC: output of 155 kW, max. torque of 540 Nm, top speed of 239 km/h, acceleration from 0 to 100 km/h in 7.8 seconds, consumption of 6.8 litres of diesel/100 km, CO2 emissions of 180 g/km
- E 300 BlueTEC HYBRID: output of 150 kW + 20 kW electric motor, max. torque of 500 Nm + 250 Nm, top speed of 242 km/h, acceleration from 0 to 100 km/h in 7.5 seconds, consumption of 4.2 litres of diesel/100 km, CO2 emissions of 109 g/km (values for Saloon)
As a result, the E 300 BlueTEC HYBRID is on a par with the E 300 CDI (170 kW/540 Nm) in practical use. However, it undercuts this model in terms of consumption and CO2 emissions by around 35 percent. The E 300 BlueTEC HYBRID also matches the E 300 CDI when it comes to vehicle weight too.
At the same time, hybridisation also represents an increase in ride comfort: starting up and moving off are practically silent, and the hybrid module also dampens any vibrations from the combustion engine. Furthermore, the vehicle's full range of climate control functions remain available even in start/stop mode.
The E 300 BlueTEC HYBRID and E 400 HYBRID at a glance:
Motoring: sailing along the motorway
The hybrid technology from Mercedes-Benz provides a whole host of additional functions which enhance comfort and efficiency at the same time, while making an overall contribution to creating a special driving experience with a sense of refined sportiness:
- Stationary vehicle/ECO start/stop function: the combustion engine can already be switched into deceleration mode at speeds below 160 km/h, since ancillary components such as the steering, brakes and air conditioning compressor operate electrically. The combustion engine is restarted quickly, conveniently and almost silently. A special Mercedes feature is the way in which the practical HOLD function interacts with the start/stop system: as soon the HOLD function is enabled (by fully depressing the brake pedal when stationary), the combustion engine also remains switched off when the driver then takes their foot off the brake pedal. Alternatively, when waiting for longer periods, the gear selector lever can be put into position "P" or the parking brake enabled, thus allowing the driver to remove their foot from the brake pedal.
Manoeuvring: parking or turning are for the most part carried out in electric mode
Accelerating: moving off and driving at low loads are carried out in purely electric mode. Accelerating from a standstill is particularly powerful, since the full torque of up to 250 Nm is available from the electric motor
Boost function: the electric motor supports the combustion engine when accelerating, such as when executing an overtaking manoeuvre, by providing additional drive torque
Cruising: at constant speeds, the engine control unit shifts the operating range towards lower specific fuel consumption levels
- "Sailing": the so-called "sailing" function can be used at speeds below 160 km/h. With this function, the combustion engine switches off and the desired speed is maintained primarily by using the electric motor, until the batteries need to be recharged
- Recuperation of kinetic energy (regenerative braking)in deceleration mode or when braking: during deceleration (reduction in speed by snapping off the throttle), the electric motor works as a generator and stores the converted kinetic energy back in the high-voltage battery. If the brake pedal is pressed, the generator output is initially increased proportionally for greater deceleration. Only when increased brake pressure is applied are the wheel brakes additionally called upon. To implement these functions, the new hybrid models have brakes which have been specially adapted for recuperation ("energy recuperation")
Comprehensive road tests using different test subjects have shown that it only takes a relatively short time for additional savings to be achieved as drivers learn to make increasingly deliberate and effective use of such functions. They are supported in their use of the features by the display concept of the hybrid models. The central display provides information on the current energy flow and the charge status of the batteries, as well as a top view of the vehicle, depicting the drivetrain and coloured energy flow. The driver is able to monitor fuel consumption via energy/time graphs.
Consumption: benefits in actual traffic, not just on paper
In urban traffic, with its frequent stationary, deceleration and short acceleration phases, the hybrid drive is able to play to its strengths in particular. This is thanks, on the one hand, to the frequent regenerative braking phases when decelerating and, on the other, to the capability to offer purely electric motoring when approaching traffic lights. The purely electric driving mode can also be used in stop-and-go traffic up to a speed of around 35 km/h and on journeys of up to a kilometre. When stationary, the combustion engine is switched off in most cases.
When it comes to inter-urban motoring, the boost, "sailing" and regenerative braking phases alternate in conjunction with an intelligent displacement of the combustion engine's load point. The actual effect depends on both the route profile as well as the behaviour of the driver.
On the motorway, the boost function takes a back seat in the higher engine speed range. Savings are achieved by the "sailing" function at speeds up to 160 km/h, for example on slight downhill gradients, by displacement of the combustion engine's operating point, electric operation of accessories, and regenerative braking when decelerating.
Extensive road tests on a wide variety of different routes have shown that compared with the notoriously economical E 250 CDI, it is possible to achieve additional significant increases in efficiency with the E 300 BlueTEC HYBRID.
The increased fuel efficiency is even more pronounced when the E 300 CDI is used as the comparison vehicle.
The hybrid module: compact, intelligently integrated powerhouse
The hybrid drive unit is an enhancement of the module used in the S 400 HYBRID and is based on the 7G-TRONIC PLUS automatic transmission.
A new element is the lack of hydraulic torque converter. Instead a wet clutch has been added, as also found in a number of powerful AMG models. As a result, the electric motor can be integrated into the transmission unit in such a way that it only requires marginally more installation space than the 7G-TRONIC (+65 mm). The lack of converter allows for a purely electric driving mode as well as the "sailing" function, and also therefore significantly increases the potential for reducing consumption.
The compact electric motor, which is installed in the clutch housing between the engine and the transmission to save space, is a 3-phase AC internal rotor magneto motor, which develops a peak output of 20 kW and a peak torque of 250 Nm at an operating voltage of 120 Volts.
The components: perfectly integrated into the vehicle
The electric energy of the hybrid drive comes courtesy of the high-voltage lithium-ion battery which has been specially developed for automotive use. Its characteristics include an output of 19 kW and an energy content of 0.8 kWh, enabling the E-Class to achieve a speed of up to 35 km/h and a range of up to one kilometre in purely electric mode.
Major advantages over conventional nickel/metal hydride batteries include a higher energy density and better electrical efficiency, together with more compact dimensions and a lower weight. Thanks to space-saving installation in the engine compartment, where it replaces the conventional starter battery, the generous interior space and boot capacity remain unchanged. The lithium-ion battery not only stores energy for the electric motor, but is also connected to the 12-Volt onboard network via the DC transformer to supply power to other standard consumers such as the headlamps and comfort features. The battery system consists of the cell block with its lithium-ion cells and the cell monitoring system, the battery management function, the high-strength housing, the cooling gel, the cooling plate, the coolant feed and the high-voltage connector.
To support cold starting and act as a buffer store for the on-board electrical system, a regular 12 Volt battery is located beneath the luggage compartment, and an additional small backup battery prevents unpleasant flickering of the vehicle lighting and dropouts in the infotainment system in start/stop mode.
By using sophisticated packaging it has been possible to integrate numerous hybrid-specific components, such as the high-power electronics, directly into the engine compartment along with the combustion engine, thus perfectly rounding off the modular principle: the hybrid models can be produced together with the regular versions on the same assembly line, without any specific issues. Another plus point of the overall concept is the scalability and compatibility with other vehicles and engines.
Safety: on a par with previous models
The intelligent integration of hybrid systems without having to make any changes to the vehicle body not only has the practical benefit of enabling full use of the available space. At the same time it also helps to ensure that the same high level of safety can be offered as in their counterparts fitted with combustion engines – something which is particularly important to Mercedes-Benz. The crash behaviour of the vehicles has also been safeguarded accordingly by means of crash simulations and tests.
When it came to the hybrid-specific properties which were relevant to aspects of safety, the development engineers were able to call on the extensive experience gained with the S 400 HYBRID introduced in 2009. The challenge in this area lay in ensuring the greatest possible safety for the electrical components. This safety system already applies in production, includes workshop personnel during servicing and maintenance, and also takes the emergency services into account when passengers need to be recovered following an accident.
Accordingly the hybrid technology of Mercedes-Benz is equipped with an extensive 7-stage safety concept.
1. In the first stage, all of the high-voltage wiring is colour-coded to eliminate confusion, and marked with safety instructions. This prevents assembly errors in production, and makes the regular quality checks easier to carry out.
2. The second stage comprises comprehensive contact protection for the entire system by means of generous insulation and newly-developed, dedicated connectors.
3. As part of the third stage, the lithium-ion battery has been given a whole package of carefully coordinated safety measures. This innovative battery is accommodated in a high-strength steel housing, and also secured in place. Bedding the battery cells in a special gel effectively dampens any jolts and knocks. There is also a blow-off vent with a rupture disc and a separate cooling circuit. An internal electronic controller continuously monitors the safety requirements and immediately signals any malfunctions.
4. The fourth stage of the safety concept includes separation of the battery terminals, individual safety wiring for all high-voltage components and continuous monitoring by multiple interlock switches. This means that all high-voltage components are connected by an electric loop. In the event of a malfunction, the high-voltage system is automatically switched off.
5. Active discharging of the high-voltage system as soon as the ignition is switched to "Off", or in the event of a malfunction, is part of the fifth stage.
6. During an accident, the high-voltage system is completely switched off within fractions of a second (stage six).
7. As the seventh and last stage, the system is continuously monitored for short circuits.
[1] All consumption and performance figures are preliminary figures based on the Saloon model, as at December 2011
Credits: Daimler AG
Copyright © 2012, Mercedes-Benz-Blog. All rights reserved.
With the completely redeveloped SL, Mercedes-Benz continues a tradition that began 60 years ago. The letters "SL" have ever since been synonymous with a symbiosis of sportiness, style and comfort – and with groundbreaking innovations. The new SL has been produced for the first time almost entirely from aluminium and weighs up to 140 kilograms less than its predecessor. Its highly rigid all-aluminium bodyshell provides the basis for agile, sporty handling that has been taken to an entirely new level, coupled with exemplary roll characteristics and ride comfort. Even better driving dynamics come courtesy of the new BlueDIRECT engines; they are more powerful yet at the same time up to 29 percent more economical than the engines in the outgoing generation. Other new features include the unique Frontbass system, which turns the luxury sports car into a concert hall regardless of whether the top is open or closed, and the highly efficient adaptive windscreen wipe/wash system MAGIC VISION CONTROL; it supplies water from the wiper blade as required and depending on the direction of wipe.
Compared with its successful predecessor, the new Mercedes-Benz SL offers considerably more comfort and sportiness, setting new standards in the luxury roadster class. Added to which is uncompromising day-to-day suitability, which turns the SL into an incomparable all-rounder among sports cars. In short, anyone that talks about the new SL is bound to be talking about the ultimate in passionate, refined motoring.
Dr Dieter Zetsche, Chairman of the Board of Management of Daimler AG and Head of Mercedes-Benz Cars: "There are around 900 million cars in the world and thousands of models. But there are only a handful of automotive icons. Our SL is one of them: it has class, it has style, it is the ultimate in comfort and luxury. But it combines all that with incredible sportiness and dynamism. You would struggle to find a car that embodies Gottlieb Daimler's aspiration more perfectly than our new SL: the best or nothing."
Lighter and more rigid: sophisticated all-aluminium bodyshell
The new-generation Mercedes-Benz SL takes the meaning of the famous letters "SL" – super, lightweight – literally. Consistent weight reduction is one of the most outstanding design characteristics in the new SL as was the case in its namesake, the original SL of 1952 with its lightweight tubular frame. For the first time Mercedes-Benz has implemented an all-aluminium bodyshell in a series-production model. Only very few components consist of other materials. The designers use the even lighter magnesium for the cover behind the tank. High-strength steel tubing is integrated in the A-pillars for safety reasons.
The new aluminium bodyshell weighs around 110 kilograms less than it would using the steel technology from the predecessor. "The effect is rather as if a heavyweight-class passenger had got out of the car" says Dr Thomas Rudlaff, responsible for the aluminium bodyshell at Mercedes-Benz. "The result is perceptible and measurable. Less weight means more dynamism and less consumption. In other words: the motoring enjoyment increases, the environmental burden sinks."
The aluminium structure is not only lighter but also proves superior to the predecessor's steel construction in terms of rigidity, safety and comfort. This is achieved thanks, among other things, to its intelligent lightweight construction with components optimised for their specific task. Thus, diverse processes
are used to make different kinds of aluminium depending on the use the component is to be given: the parts are made by chill casting or vacuum die-casting, worked into extruded aluminium sections or into aluminium panels of different thicknesses. The result: high rigidity, high safety levels and better vibration characteristics.
Although the new SL is even more comfortable and has more assistance systems on-board than its predecessor and therefore does actually sacrifice some of the weight saved through the aluminium bodyshell, the scales show some astonishing figures: the new SL 500 (1.785 kg) weighs around 125 kilograms less than its predecessor. On balance, the SL 350 (1.685 kg) is even 140 kilograms lighter – all thanks to a host of other intelligent enhanced details to reduce weight, which Mercedes-Benz has also implemented in the new SL in addition to the aluminium bodyshell.
Driving pleasure: frugal, powerful engines and agile suspension
Powerful while accelerating, effortlessly superior across all speeds, nimble on winding roads – the new SL provides ample driving pleasure. Apart from the powerful engines, the sportily tuned yet comfortable suspension, which also boasts intelligent lightweight construction, proves outstanding. For instance, the steering knuckles and spring links on the front axle are also made out of aluminium to reduce the unsprung masses. The same also applies to virtually all the wheel location components on the rear axle.
The new SL is available with two different suspension systems: the SL features semi-active adjustable damping as standard. The optional active suspension system ABC (Active Body Control) is available as an alternative.
Both suspension variants are combined with a new electromechanical Direct-Steer system featuring speed-sensitive power steering and a ratio that can be varied across the steering wheel angle. This ensures excellent straight-line stability and, therefore, a high degree of assuredness when travelling at motorway speeds and makes the SL very agile. It also reduces the amount of steering required when parking and manoeuvring.
The new V8 in the SL 500 develops 320 kW (435 hp) from its displacement of 4663 cc and thus around 12 percent more than its predecessor despite some 0.8 litres less displacement. The fuel consumption has been reduced by up to 22 percent. At the same time, the torque has increased from 530 Nm to 700 Nm – a gain of 32 percent. Although the displacement remains the same at 3499 cc, the new V6 engine in the new SL 350 develops 225 kW (306 hp) and delivers 370 Nm of torque. It uses just 6.8 litres of fuel per 100 kilometres, making it almost 30 percent more economical than its predecessor. Both engine variants come with a standard-fit ECO start/stop function. The 7G-TRONIC PLUS automatic transmission, which has been optimised in relation to fuel consumption and comfort, also contributes to the exemplary, low fuel consumption. The fuel economy of the BlueDIRECT engines takes nothing away from the roadster's raciness. Quite the contrary: the SL 350 accelerates from 0 to 100 km/h in 5.9 seconds, making it three tenths of a second faster than its predecessor. The SL 500 takes just 4.6 seconds – eight tenths less than the previous SL 500.
Interior: aesthetic, stylish, sporty
The new SL combines its aesthetically honed profile, which follows the Mercedes-Benz tradition, with a luxurious feel. Fine materials, perfectly finished with great attention to detail, distinguish the style and character of the interior.
Compared with its predecessor, the new generation of the SL is much longer 4612 mm (+50 mm) and wider 1877 mm (+57 mm), providing more room for more comfort in the interior, too. Shoulder room (+37 mm) and elbow room (+28 mm) have been increased, exceeding the dimensions normally found in this vehicle class. Clear lines create a formally coherent internal space within this comfortable interior. Generously used wood trim extends from the centre console across the dashboard into the doors, creating a pleasant wrap-around effect. Three types of wood along with two different aluminium trim finishes are available. Perfectly in tune with the roadster's character, it combines the unpretentious atmosphere of a high-performance sports car with a comfortable, stylish ambience one comes to expect in a luxurious touring car.
Design: classic SL proportions
The designers have brought the latest generation of the SL unmistakably to life on the basis of tradition but added new perspectives and visions. The result is a stylishly sporty and elegant luxury sports car with the classic hallmark SL balanced proportions: the long bonnet gives way to a compact passenger compartment that is set well back. A wide, powerful rear end giving the impression of raciness provides the finishing touch. A handful of elaborately styled lines define the powerfully sculpted and yet calm surfaces of the flanks. Finely worked details, a striking rear end as well as ventilation grilles with chromed fins from the dynamic traditional Mercedes-Benz design heritage visually emphasise the SL legend.
An upright classic sports car radiator grille clearly marks out the new SL visually as a prestigious member of the current Mercedes-Benz sports car family. The centrally positioned star is a contemporary reinterpretation of the famous trademark, which now extends into the centre section with its organically flowing contours.
Dynamically slanting headlamps set well to the outside flank the striking front end and give the new roadster its own unmistakable face. The headlamps come as standard with the Intelligent Light System (ILS). With five different lighting functions that are tailored to typical driving and weather conditions, and are activated depending on the driving situation, they offer the driver a much better illuminated field of vision. The striking sidelights and the horizontal strip of the daytime running lamps in the far ends of the bumper feature LED technology.
Vario-roof: MAGIC SKY CONTROL as an option
The sixth generation of the SL also offers a vario-roof that can be retracted into the boot using an electrohydraulic mechanism to save space, which converts the SL in a few seconds into a roadster or a coupé, depending on the driver's wishes and the weather. Unlike its predecessor, three versions are available for the new SL: painted, with glass roof or with the unique panoramic vario-roof with MAGIC SKY CONTROL. The transparent roof switches to light or dark at the push of a button. When light it is virtually transparent, offering an open-air experience even in cold weather. In its dark state the roof provides welcome shade and prevents the interior from heating up in bright sunlight. The frame of the three roof versions is made of magnesium, making the roofs around six kilograms lighter than the roof on the predecessor, thus providing a lower centre of gravity for the vehicle and, in turn, better agility.
The engineers have refined the operating mechanism for the roof and boot lid. It now takes less than 20 seconds to open or close the roof completely.
Aerodynamics: new standards
The design of the new SL not only meets high aesthetic demands but it also boasts exemplary aerodynamic qualities.As such, the roadster merits best marks in its segment in four important disciplines:
- With the lowest drag coefficient (cd = 0.27 in the SL 350);
- With the lowest wind noise that is virtually on a par with a closed saloon;
- With the best comfort for open-top motoring so that you can still have
the roof down even at high speed;
- With virtually no accumulation of dirt on the side windows.
Two world premieres: Frontbass and MAGIC VISION CONTROL
With two innovations, the new SL remains true to its tradition as technological trendsetter:
- MAGIC VISION CONTROL is a new, intelligent and highly efficient wipe/wash system. The innovative wiper blade concept always applies the washer fluid just in front of the wiper blade lip via the channels integrated into the blade – in both directions of wipe. As a result, no water is splashed onto the windscreen during spraying to disrupt the driver's visibility, while at the same time cleaning the windscreen perfectly. The water also remains on the windscreen, thus ensuring it is cleaned without troubling the occupants, even with the roof down. For the first time a fully heated wiper blade is available as an option that prevents snow or ice from forming on the blade in winter. This heating function also allows warm water to be applied directly onto the windscreen for the first time, even in cold temperatures.
- The likewise unique Frontbass system intelligently uses the free spaces in the aluminium structures in front of the footwell as resonance spaces for the bass loudspeakers. As a result the new SL features clear, crisp bass sounds that make possible a concert hall ambience even with the top down, and frees up space in the doors.
Both innovations are part of the extensive standard equipment of the new SL.
HANDS-FREE ACCESS: 'kick' to open
The HANDS-FREE ACCESS system is another Mercedes-Benz innovation which provides hands-free, contactless operation of the boot lid. The driver simply moves their foot in the vicinity of the rear bumper. Mercedes-Benz is the only car maker to offer a system which not only automatically opens the boot lid but closes it as well.
The safest roadster
Thanks to the crash-optimised aluminium structure, standard-fit PRE-SAFE® and assistance systems on the same high level as the S-Class, the SL is the world's safest roadster. The rigid aluminium bodyshell forms a sturdy passenger compartment along with precisely defined deformation zones in the front and rear ends. In the event of the vehicle overturning, A-pillars made out of a mix of steel and aluminium and two roll-over bars protect the passenger compartment. The restraint systems including the two-stage driver and front passenger airbags have been further developed. A headbag integrally covers the side head-impact area. An additional thorax airbag in the seat backrest can protect the upper body in the event of a side impact. Another new feature is the crash-responsive NECK-PRO head restraints developed by Mercedes-Benz which are fitted as standard in the SL. An active bonnet and a front end with a large, yielding impact area help ensure pedestrian protection.
A safety highlight is the unrivalled anticipatory occupant protection system PRE-SAFE® developed by Mercedes-Benz which is fitted as standard. If the system detects a serious risk of an accident, it reflexively activates precautionary protective measures for the vehicle occupants, so that the seat belts and airbags are able to fulfil their protective function to the full during an impact.
Additional post-crash measures supplement the integral safety concept and facilitate rapid assistance: regardless of the severity of the impact, the doors can be automatically unlocked after an accident, the interior lighting activated and the side windows lowered by 50 millimetres to ventilate the interior more effectively. The steering wheel can also be moved upwards.
Standard: ATTENTION ASSIST AND ADAPTIVE BRAKE
In the new SL too, a unique combination of driver assistance systems helps prevent accidents. These include the standard-fit drowsiness detection system ATTENTION ASSIST and the ADAPTIVE BRAKE. The latter features ABS, acceleration skid control (ASR) and active yaw control, and offers comfort and convenience functions in addition to safety functions.
The ADAPTIVE BRAKE works in conjunction with the equally adaptive brake lights. In emergency braking situations, it warns vehicles behind with flashing brake lights.
PRE-SAFE® Brake: autonomous partial and emergency braking in response to a serious risk of a rear-end collision
As an option DISTRONIC PLUS proximity control and PRE-SAFE® Brake, which is already well proven in other Mercedes-Benz models, are available. Both work on the basis of the same radar sensors. Once a serious risk of a rear-end collision is detected, the PRE-SAFE® Brake warns the driver initially and can initiate autonomous braking if the driver fails to react, and so either prevent the accident or at least mitigate its severity. PRE-SAFE® can also activate occupant protection measures.
Active Parking Assist: automatically manoeuvred into a parking space
The Active Parking Assist is new in the SL. Using ultrasound sensors it can identify parking spaces and automatically steer the vehicle into the space while parking.
Infotainment: COMAND with internet access
Even in the entry-level variant, the new Mercedes-Benz SL comes with the "Cockpit Management and Data System" COMAND. Functionality includes Bluetooth telephony along with simpler operation of the car phone. COMAND Online with internet access and DVD changer is also available as an option. It provides unlimited web browsing while the vehicle is stationary along with high-speed access to a Mercedes-Benz online service – for instance requesting a weather report or a special destination search. There is also the option of sending individual destinations and routes via Google Maps to the vehicle. For the first time, Mercedes-Benz is also offering new apps for the new SL: in addition to a free news app and a Facebook app, there are optional Mercedes-Benz apps for share prices and a car park finder. A Yelp app to look for restaurants is available for the US market.
Both COMAND versions feature a high-resolution TFT colour display with 17.8 cm diagonal (800 x 480 pixels) at the side next to the instrument cluster. This screen arrangement prevents the driver from being distracted as far as possible.
Orders for the new SL commenced on 15 December 2011. The prices including
19% VAT are as follows:
- SL 350 BlueEFFICIENCY: 93,534.00 euros
- SL 500 BlueEFFICIENCY: 117,096.00 euros
To coincide with the launch of the new SL, Mercedes-Benz will also be offering a special-edition model, the "Edition 1", for a limited period. The "Edition 1" is superbly equipped and comes as standard with a panoramic vario-roof, AMG bodystyling, sports suspension, AMG 19-inch light-alloy wheels, designo nappa leather with contrasting topstitching, AIRSCARF, heated seats, electric draught-stop, ambient lighting, Harman/Kardon® Logic7® surround sound system and much more. The designo crystal silver magno special paintwork is available exclusively for the "Edition 1", along with trim in wave or deep white aluminium. Depending on the basic model, the extra charge is between 19,028.10 euros and 22,598.10 euros.
Credits: Daimler AG
Copyright © 2012, Mercedes-Benz-Blog. All rights reserved.
