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X5 E70 (2007 - 2013)
E70 BMW X5 produced between 2007 and 2013. Discuss the E70 X5 with other BMW owners here.

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Old 09-16-2012, 08:38 AM
sarends sarends is offline
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Collection of BMW Adaptive Drive Descriptions

I thought it would be interesting to post these here.

Adaptive Drive described in the context of the X5M:

"The intelligently interlinked active chassis control systems of Dynamic Drive and Electronic Damper Control (EDC) form the centrepiece of a genuine ‘high-end’ chassis: In connection with two M-specific settings, Adaptive Drive is the perfect synthesis of maximum driving dynamics and supreme travelling comfort.

To achieve this, the driving speed, the steering angle as well as the lateral and longitudinal acceleration of the vehicle are permanently monitored and transformed into control commands for stabilisers and shock absorbers. These components counteract the centrifugal forces of the vehicle and actively reduce the body movements of your BMW X5 M. Precise steering characteristics, high directional stability and reduced braking distances provide noticeably more travelling comfort and an ultimate driving experience on short stretches. At the touch of a button, you can switch between normal and the especially sporty chassis setting."

Adaptive Drive Described in General

On every curve, on every road surface: Adaptive Drive counteracts the forces that cause body roll. Your BMW handles with outstanding sporting agility, while also ensuring a very comfortable journey for you and your passengers. Body roll is practically eliminated, and winding roads can be enjoyed with a maximum of stability and safety.

The proven effectiveness of BMW's innovative chassis control systems, Dynamic Drive and Variable Damper Control (VDC) work closely together to deliver an outstandingly smooth ride and enhanced agility. Sensors in your BMW permanently monitor vehicle speed, steering-wheel position and the pitch and yaw forces acting on the chassis. Using this data, the system precisely adjusts the stabilisers and the dampers, changing their settings quickly and accurately. This coordinated interaction of dampers and stabilisers counteracts the forces that cause the body to roll or sway. Your BMW hugs the road, delivers neutral self-steering behaviour, outstanding agility and shorter braking distances.
Furthermore, Adaptive Drive adjusts the suspension settings to suit the character of the road surface. Each axle has its own independent motor that can adjust the dampers on each individual wheel. When the road surface under one side of the vehicle differs in character from that on the other side - such as when driving on roads with gravel shoulders - Adaptive Drive instantly adjusts the suspension settings of the wheels on one side to practically eliminate any perceptible unevenness in the road. In addition, you can choose between a more comfortable default setting for the suspension, or a more sporting setting.
Such high-speed calculations and responses demand a high-performance electronics system. Adaptive Drive utilises FlexRay, a high-speed data transfer system that networks sensors, control units and stabilisers.

Dynamic Drive.
Supreme agility, unwavering stability and unmatched comfort on bends: the active chassis control system Dynamic Drive minimises body roll and distributes it between both axles, ensuring a comfortable ride for all occupants.

Dynamic Drive uses active stabilisers on the front and rear axles to counteract the vehicle's tendency to roll in a corner. Working together with acceleration and position sensors, a management system and other components, such as a compensation tank for sound control, the system ensures supreme agility at all speeds, balanced reactions to load changes and remarkably precise steering.
The stabilisers continually adapt to suit the driving situation and the changes to the vehicle's self-steering behaviour. For example, when driving on the straight, Dynamic Drive reduces the pressure of the stabilisers, treating them individually, so allowing for a highly comfortable ride - a particular benefit for rear-seat passengers.
When cornering or making sudden changes of direction, a "sportier" setting will see the stabilisers increase the rigidity of the suspension relevant to the intensity of the lateral forces to prevent body roll. Roll distribution between the front and back axles also helps in difficult situations.
Dynamic Drive ensures that the vehicle literally hugs the road, under- or oversteering is reduced - resulting in enhanced safety, greater comfort and an impressively dynamic driving experience.

Electronic Damper Control.
Electronic Damper Control (EDC) automatically or manually adjusts each damper to suit the driving conditions meaning you enjoy outstanding comfort along with the best in BMW on-road safety. EDC reduces variations in wheel load, ensures tyres have excellent traction and counteracts bodyshell movement regardless of the weight your automobile may be carrying or the state of the road's surface.

Sensors constantly monitor all factors influencing the vehicle's behaviour and occupants' comfort, in order to precisely adjust the damper control. In a fraction of a second, the signals are analysed by the EDC microprocessor and orders are sent to the actuators on the shock absorbers, which, with the help of magnetic valves, are variably adjusted to provide optimal suspension. Thanks to Electronic Damper Control, the tendency for the nose to dip when braking is practically eliminated. The influence of potholes and unevenness on the road surface is reduced to minimum.

In addition to increased driving comfort and improved roll characteristics on the tyres, EDC also contributes to vehicle stability and safety. By reducing the nose's tendency to dip when braking and improving the tyre traction, EDC shortens the braking distance when braking heavily. The damper adjustment means that even when braking with ABS the vehicle chassis remains upright on the road and all four wheels have the largest possible contact to the surface.

Flex Ray.
Flex Ray is a newly developed serial bus system that speeds up data transfer between vehicle components. It enables different systems to be safely and precisely networked. New, fast driver assistants and chassis control systems mean safer, more comfortable driving.

The complexity of electronic driver assistant systems is growing continuously. New chassis and drivetrain control systems demand extremely high data transfer speeds to function effectively.
To meet this growing demand, BMW teamed up with other companies to develop a new bus system that provides the safety, speed and robust quality demanded in automotive applications. The 2007 BMW X5 is the first standard-production vehicle in the world to use this leading-edge technology. Flex Ray controls the optical bus system of the Adaptive Drive chassis control system, and is used in controlling the stabilisers and electromagnetic valves of the dampers; this enables Adaptive Drive to eliminate the effect of body roll on the vehicle.
One key advantage of Flex Ray is its high data transfer rates: at up to 10 MBit per second, it's twenty times faster than the conventional CAN bus system. A second Flex Ray communication channel acts as a back-up, providing redundancy to ensure excellent safety at all times. If one channel fails to function correctly, the second is still available. For systems that are not safety-critical, a faster data transfer rate can be achieved through the use of a single channel.
These advantages result in significantly greater driving comfort and safety, enabling on-board systems to communicate more quickly and more safely.

X6M Adaptive Drive Description

The synthesis of Electronic Damper Control and Dynamic Drive roll reduction minimises the body movements of the BMW X6 M. Unrivalled steering precision and maximum tracking stability noticeably increase comfort during fast cornering.
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