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X6 SAV - E71/E72 (2008 - ...) - Agility and Stability

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X6 SAV - E71/E72 (2008 - ...)
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Unparalleled agility and tracking stability thanks to xDrive and Dynamic Performance Control.
The positive effect of Dynamic Performance Control on the agility of the BMW X6 comes out clearly right from the start, even in conventional everyday traffic, the vehicle steering into bends with significantly enhanced precision also when travelling at moderate speeds.
Dynamic Performance Control likewise enhances the handling and, indeed, the overall supremacy of the BMW X6 in sudden steering manoeuvres and at particularly high speeds in bends. With a vehicle possibly pushing to the outside of a bend when driving to the limit either at the rear or on its front wheels, depending on road conditions, the angle of the bend and road speed, both BMW xDrive and Dynamic Performance Control are able to counteract both of these manifestations of driving instability: As soon as the vehicle threatens to oversteer, xDrive reduces the transmission of power to the rear wheels pushing to the outside. And now Dynamic Performance Control also comes in, withdrawing drive forces from the outer rear wheel in a bend subject to particular centrifugal loads and diverting these forces to the inner rear wheel.
This intervention in the interest of greater stability is so quick and finely controlled that the driver will not even notice what is happening. What he will notice, however, is that the BMW X6 ensures exceptional steering precision also when driving dynamically and, indeed, to the extreme limit.
Operating exactly the other way round, Dynamic Performance Control also counteracts any tendency to understeer: xDrive reduces the transmission of power to the front wheels “pushing” to the outside, Dynamic Performance Control shifts drive power to the outer rear wheel in a bend in the interest of optimum stability. As a result, the car steers even more smoothly and precisely into the bend, following the course set by the driver with greater agility and enhanced tracking stability, regardless of road speed.


Unique: Dynamic Performance Control enhances steering precision also when the driver takes his foot off the gas pedal.
A further particular feature of Dynamic Performance Control is that engine power and torque are split variably between the rear wheels not only when the engine is “pulling” the vehicle, but also in overrun. This is ensured by an additional, superimposed transmission unit within the final drive made up of a double planetary gearset and a multiple-plate clutch operated by an electric motor, varying the distribution of drive power also when the driver takes his foot off the accelerator.
The BMW X6 is the first vehicle in the world to offer such a stabilising effect independent of engine load and drive power.
Dynamic Performance Control also serves to optimise traction on a slippery surface: The ability to vary the transmission of engine power specifically as required now also between the two rear wheels serves, among other things, to improve traction and puling force whenever the vehicle is running on different surfaces from one side to the other, for example with asphalt on one side and a snowbound surface on the other. Any differences in the frictional coefficient between the wheels on the left and right (modal split) are set of by Dynamic Performance Control specifically sharing out drive forces on the rear axle.
Taking just one look at the instrument cluster, the driver receives a clear message showing the interaction by Dynamic Performance Control: A graphic display presented as an alternative to the other displays on the on-board computer simply by pressing the lever on the steering column informs the driver of the current distribution of drive power. In a symbolic graphic presenta-tion of the four drive wheels, bar diagrams show how much power is going to each wheel at any given point in time.


DSC intervening only when driving to the limit.
The difference in drive forces between the two rear wheels provided by Dynamic Performance Control may go all the way to 1,800 Newton-metres. But even then, all the driver will feel when Dynamic Performance Control intervenes is a – significant – increase in agility, traction and driving stability. Another effect he will also feel and appreciate thanks to Dynamic Perfor-mance Control is that DSC Dynamic Stability Control intervenes much less frequently than before. In practice, this means that the driver is able to use the full drive power and torque of the engine much longer than with a conventional system, DSC acting on individual wheels or reducing engine power only when the driver really pushes the car to the extreme limits of physical performance.
Over and above this stabilising effect, DSC in the new BMW X6 offers a wide range of additional functions serving to promote safe and dynamic moto-ring. These include ABS anti-lock brakes, ASC Automatic Stability Control, Trailer Stability Control, HDC Hill Descent Control, DBD Dynamic Brake Control automatically maximising brake pressure when required in the interest of minimum stopping distances, CBC Cornering Brake Control and, finally, Active Cruise Control complete with its own brake application function.
The ADB Automatic Differential Brake serves as a transverse lock between the two wheels, and Fading Compensation increasing brake pressure as required under extremely high brake temperatures helps to maintain the brake forces required even under extreme conditions. Regular Dry Braking, in turn, optimises brake performance in wet conditions while the Start-Off Assistant enables the driver to set off more smoothly and easily on an uphill gradient.
The new BMW X6 features a parking brake operating both electromecha-nically and hydraulically and activated or released simply by pushing a button.
Reflecting the high standard of driving dynamics offered by the BMW X6, DSC also comes with DTC Dynamic Traction Control as a special function, raising the DSC response thresholds to a higher level, allowing a particu-larly sporting and active style of motoring, and enabling the driver to set off smoothly on snow or in loose sand with the drive wheels intentionally spinning slightly.
Supported by a wide range of DSC functions, the high-performance brake system featured in the BMW X6 ensures excellent stopping power under all conditions. Inner-vented discs on all four wheels take up brake energy, newly developed lightweight brakes featuring 385 millimetres discs and aluminium swing callipers front and rear guarantee extremely good resistance to fading and maximum brake comfort on the top-of-the-range BMW X6 xDrive50i.
The lightweight brake discs are riveted on to an aluminium cover, following a principle patented by BMW and now also emulated by other car makers in order to significantly reduce unsprung masses and prevent deformation of the discs on account of high temperatures even under extremely high brake loads.

Last Updated on Monday, 12 April 2010 14:17  

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