The Vision GLK FREESIDE is powered by a new-generation diesel engine. The four-cylinder unit, with a 2.2-litre displacement, reflects the study vehicle’s dynamic basic concept and allows impressive performance figures with an output of 125 kW/170 hp, plus reduced consumption and reduced emissions. The technical features of the extremely compact and smooth CDI powerplant with rear camshaft drive include fourth-generation common rail direct injection with an injection pressure of 2000 bar and a two-stage turbocharger system.

The modular BLUETEC emission control system has been enhanced by Mercedes-Benz and the most efficient version has been combined for the first time with a four-cylinder engine.

The focus of BLUETEC technology is on ensuring the greatest possible reduction in nitrogen oxide emissions. This is the only exhaust gas component that is intrinsically higher in diesel engines than in petrol engines. In addition to an oxidizing catalytic converter and a maintenance-free particulate filter, an SCR catalytic converter is also used. AdBlue, a harmless, aqueous urea solution, is injected into the exhaust gas stream. This converts up to 80 percent of the nitrogen oxides into harmless nitrogen and water. Here the study highlights the way in which compact four-cylinder diesel models can also meet the most stringent emissions limits, even those specified by EU6, which will apply to all new vehicles from 2015. By then today’s EU4 nitrogen oxide limits will have to be reduced by around another 70 percent to 0.08 g/km. Even the strict US BIN 5 limits and the Californian LEV2 regulations would not present a problem for the Vision GLK FREESIDE.

The new 4MATIC drivetrain in the Vision GLK FREESIDE is one of the most powerful all-wheel-drive systems. Thanks to the compact, lightweight and friction-optimized basic design, with a longitudinally installed engine and block-design main transmission and transfer case, it offers various advantages over other systems with a transversely installed drive unit. The fuel consumption, for example, is around the level of a comparable, conventionally powered vehicle. The minimal vibration and noise levels rival those of today’s luxury-class models.

The 45:55 percent basic distribution of the drive torque between the front and rear axle plus the ESP®, ASR and 4ETS dynamic handling control systems ensure effortlessly superior and predictable performance in all conditions. Optimum traction, the greatest driving stability and the best handling are assured at all times. The newly developed multiple-disc clutch in the central differential supports the system where the friction between the tires and the road surface is particularly low, for example on snow or ice. A basic partial locking force of 50 Newton meters between the front and rear axles produces a significant increase in traction, while maintaining the high level of driving stability.

The “G” button in the centre console increases the Vision GLK FREESIDE’s aggression when required on rough terrain. Pressing the button activates a special transmission mode which varies the 7G-TRONIC’s shift points, adjusts to “softer” accelerator characteristics and activates the ESP’s off-road function. A manual shift mode is also available – gears are changed using the shift paddles behind the steering wheel. A further switch activates the Downhill Speed Regulation (DSR), which automatically maintains a preselected speed on steep downhill inclines.

The Vision GLK FREESIDE’s AGILITY CONTROL suspension resolves a conflict of objectives which particularly affects the SUV class, where chassis engineers want to create a vehicle which is both sportily agile and comfortably smooth yet one which can also cope with off-road terrain. If the focus is on sportily active handling, the springs and above all the shock absorbers have to demonstrate a certain firmness, which precludes access to the brand’s typical suspension comfort and limits the off-road options. If the vehicle is set up with softer dampers to ensure suspension comfort and off-road capability, dynamic handling naturally suffers. The solution is “amplitude-dependent damping”: the damping forces of the shock absorber are configured to respond flexibly rather than lineally. In normal driving mode on moderately contoured roads or on slow off-road tours the system responds softly, enhancing both the comfort of the occupants and the off-road capability. To ensure that this level of comfort is retained in the face of hard driving or abrupt evasion maneuvers, in these situations the dampers deliver a harder performance, ensuring optimum driving stability. The driver of the Vision GLK is supported by speed-sensitive power steering which ensures the optimum steering assistance for the given situation. Parking or maneuvering off-road are an easy exercise because the greatest possible power assistance is on hand. At higher speeds the assistance is reduced in favor of greater driving stability.

Since the launch of the legendary G-Class in 1979, Mercedes-Benz has been a leader in the field of off-road vehicles. With the first generation of the ML-Class, which appeared in 1997, Mercedes-Benz marked out the contemporary sports utility vehicle segment. Including the latest generation of this model, which made its debut in 2005, this model series is one of the most successful premium SUVs in the world, with around 900,000 vehicles sold. The GL-Class in turn has occupied the top spot in the overall SUV world since 2006, its occupants travelling first-class whatever the conditions, whether on or off the road. The Vision GLK FREESIDE now demonstrates how the expertise garnered in the course of creating this sequence of models can be translated into compact format. The new compact character, in other words, is in the best of company – just like the production model, which is to be launched in autumn 2008.

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