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7 Series - F01/F02 (2008 - ...) - Tailored Driving Dynamics

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Driving dynamics tailored to the driver’s requirements: Dynamic Damping Control and Dynamic Driving Control.
The new BMW 7 Series comes as standard with electronic Dynamic Damping Control. The newly developed dampers adjust individually as required both to road surfaces and the driver’s style of motoring in order to prevent any undesired movement of the vehicle which might possibly be caused by bumps in the road or a high level of lateral acceleration.
The driver is able to influence the degree of Dynamic Damping Control through BMW’s new Dynamic Driving Control, choosing from a comfortable, a normal and a sporting set-up. BMW is indeed the world’s first car maker to use a damping system for this purpose in which the inbound and rebound stages are adjusted infinitely and independently of one another. This offers a unique combination of firm suspension characteristics, on the one hand, and a comfortable response to road bumps, on the other.
As an option the suspension of the new BMW 7 Series may be further enhanced by Dynamic Drive anti-sway control reducing body roll in fast bends and in a sudden change of direction.
To do this sensors determine the side sway forces currently acting on the car, swivel motors in the anti-roll bars front and rear quickly and precisely building up appropriate counter-forces to keep the car smooth and stable.

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Superior handling thanks to performance brakes and Dynamic Stability Control.
Performance compound brakes in the new BMW 7 Series guarantee excellent stopping power and deceleration in every situation. Inner-vented brake discs and swing-calliper brake configuration front and rear optimised for maximum efficiency guarantee supreme resistance to fading and maximum brake comfort. On the lightweight brake discs the friction ring is welded on to the aluminium ring cover in a principle patented by BMW and now used also by other car makers serving, together with the aluminium calliper frame design on the front axle, to significantly reduce unsprung masses and prevent deformation of the discs on account of high temperatures even under extremely high brake loads.
The brake system is reinforced by a wide range of functions provided by DSC Dynamic Stability Control. Over and above its stabilising effect, DSC in the new BMW 7 Series comprises further functions in the interest of safe and dynamic motoring.
This include ABS anti-lock brakes, ASC Automatic Stability Control, Trailer Stability Control, CBC Cornering Brake Control, as well as DBC Dynamic Brake Control automatically maximising brake pressure on both axles as soon as it sees that the driver wishes to apply the brakes with full power.
Under extremely high brake temperatures, an appropriate increase in brake pressure generated automatically by the system prevents any decrease in brake power (Fading Compensation), giving the driver virtually the same brake performance as before. Regular Dry Braking optimises brake performance in the wet, and the Standby Brake function builds up moderate brake pressure as soon as the driver takes his foot off the gas pedal very quickly, ensuring immediate brake response.
The Start-Off Assistant makes it easier to set off on uphill gradients by preventing the car from rolling back for a certain short period defined in advance. Cruise control with its brake function, finally, uses the automatic build-up of brake pressure by DSC to apply the brakes smoothly and comfortably at speed.
The new BMW 7 Series comes with a parking brake operated either electromechanically or hydraulically in the interest of extra safety and comfort. One of the parking brake features is the Auto-Hold function ensuring additional comfort particularly in stop-and-go traffic: Whenever the car comes to a standstill – also on an uphill gradient – Auto-Hold automatically keeps the car in position by applying the brakes consistently until the driver presses the gas pedal again.
Pressing the DSC-Off button on the new BMW 7 Series, the driver also has the option to choose DTC Dynamic Traction Control as a special mode of DSC. DTC raises the DSC responds thresholds, making it easier to start off on snow or loose sand in the TRACTION mode. Yet a further option is to activate DTC via Dynamic Driving Control as part of the SPORTS+ mode for a particularly sporting and active style of motoring. If he wishes, the driver is also able to deactivate DSC completely. In the DSC-Off mode an electronic locking function is activated on the rear axle differential through the rear-wheel brakes for a particularly sporting and ambitious style of motoring, for example when accelerating out of bends and sharp turns. To optimise traction, a drive wheel spinning in tight bends while accelerating is slowed down specifically as required, allowing the opposite wheel on the same axle to maintain its drive power and pulling force.

Driving dynamics with intelligent control: Integrated Chassis Management and FlexRay technology.
Interaction of the chassis and suspension systems is optimised by ICM Integrated Chassis Management networking the various functions with one another. High-performance electronic management analysing the behaviour of the car by evaluating numerous sensor signals provides an exact balance of drive and chassis functions within fractions of a second, ensuring maxi-mum stability under all driving conditions.
And even when conditions suddenly change – for example on changing surfaces, when suddenly steering in another direction, when abruptly accelerating or applying the brakes – ICM responds by precisely intervening in DSC, Dynamic Damping Control and, where fitted as an option, Integral Active Steering and Dynamic Drive.
Another feature unique the world over is the way chassis control systems and the drivetrain are networked in the new BMW 7 Series. This is done by the FlexRay high-speed data transmission system for quick and reliable coordination of all individual functions. Developed by a consortium of high-tech companies under the leadership of BMW, FlexRay offers a level of data transfer quite unprecedented in the past.
Indeed, its transmission rate is 20 times higher than that of a conventional transmission system. On the new BMW 7 Series up to 16 control units are able to communicate with one another via FlexRay, ensuring extremely fast, precise and perfectly coordinated operation of control units for the drive, suspension, damping, steering and brake systems in the BMW 7 Series.
Longitudinal, lateral and vertical movements are controlled with a level of accuracy not to be found in any other car. BMW is the first car maker in the world to introduce FlexRay technology in its production models.

Maximum agility, efficiency and solidity ensured by intelligent lightweight construction.
The body of the BMW 7 Series offers an exceptionally good balance of optimised weight and all-round solidity. This is ensured by intelligent lightweight construction, appropriate use of high- and ultra-high-strength steel making the entire body structure extremely stable and the use of aluminium on nume-rous other components serving to enhance passive safety on reduced overall weight.
Compared with the former model, the bodyshell of the new BMW 7 Series offers an increase in torsional stability by approximately 20 per cent, again setting the foundation for outstanding driving dynamics.
The lightweight construction quality factor, as it is called, that is torsional stiffness versus the footprint and weight of the car, has also been improved significantly once again.
The combination of an aluminium roof with a steel body is absolutely unique in the 7 Series’ luxury performance segment.
The weight advantage provided by this solution as opposed to a conventional steel roof is approximately 7 kilos, the change in the centre of gravity obtained in this way making a significant contribution to the car’s agility. The engine compartment lid, the doors, the front side panels and the front spring supports on the body are likewise made of aluminium. Together with the use of aluminium doors for the first time in a large-scale produc-tion vehicle, BMW is able in this way to reduce the overall weight of the car by another 22 kilos.



Last Updated on Monday, 12 April 2010 14:36  
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