BMW 325I - BROCHRUE 2010 Wartungshandbuch PDF herunterladen (Seite 35)

xDrive | Dynamic Stability Control | 3534

xDrive all-wheel drive: the power to master

anything that crosses your path.

The intelligent xDrive all-wheel-drive system takes all-road traction to new heights

while maintaining a BMW’s legendary agility. On smooth, dry roads, vehicles with

xDrive have the feel of their rear-wheel-drive counterparts. But hit a wet uphill

curve, for instance, and even before wheelspin can occur, the xDrive system

immediately recognizes any need for a change in power distribution. Almost

instantaneously, xDrive can send more torque to the front axle to enhance stability.

Should one wheel or axle spin faster than the other, the brakes automatically

engage, as needed, to bring all wheels back in sync.

Working in conjunction with xDrive is the latest version of BMW’s Dynamic

Stability Control (DSC) system that includes four innovative automatic braking

functions: Brake Stand-by: If you suddenly remove your foot from the throttle,

DSC anticipates that you’re going to want to stop quickly. It then pre-tenses the

brake calipers for quicker action when you step on the brake pedal. Brake Drying:

When it rains, your brakes get wet and can take longer to stop the vehicle. When

the sensor determines that it is raining, it reacts by periodically bringing the brake

pads into contact with the rotors, just enough to eliminate the accumulated

moisture and help dry them, but not enough to cause brake application. Start-off

Assistant: When stopped on an incline, DSC prevents your vehicle from rolling

backwards or forwards. It even holds your car momentarily when you release the

brake to start moving again. Brake Fade Compensation: As your brakes heat up

due to contin uous or repeated braking (like when you’re descending a winding

mountain road), the same pedal action results in less braking power. DSC senses

and compensates for this by applying the brakes with more force with the same

pedal action.

Augmenting the xDrive system are Automatic Stability Control (ASC) and Dynamic

Brake Control (DBC), which maximizes brake force on both axles, should the system

detect that the driver wishes to brake as hard as possible. And a special Dynamic

Traction Control (DTC) mode can be selected at the push of a button, allowing

more wheel slip and yaw angle, providing incremental traction on slippery surfaces

and snow. BMW’s advanced traction and stability technology ensure that no

challenge faced on the road ever goes unanswered.

BMW’s xDrive all-wheel-drive system continuously monitors the vehicle’s status – rpms,

steering angle, acceleration – and when it detects wheelspin, sends the optimal

amount of power to the axle with traction.

Continuous power shift: Rear axle Front axle

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BMW 325I - BROCHRUE 2010 Wartungshandbuch Seite 35