BMW X5 2001 Bedienungsanleitung PDF herunterladen (Seite 18)

X5 Dynamic Stability Control

Automatic Stability Control (ASC+T)

ASC prevents unintentional wheel slip of the drive wheels in every situation.

The DSC III control unit determines if the vehicle is loosing traction due to excessive longi-

tudinal wheel slip based on input from the wheel speed sensors. An ASC regulating

sequence is initiated if the wheel slip exceeds the control units stored allowable values.

The DSC III can control longitudinal wheel slip by two means:

• Automatic Stability Control ASC.

Engine Intervention

• Automatic Differential Brake ADB. Brake intervention

ASC Engine Intervention

Engine torque may be reduced by:

• Reducing the throttle opening angle

• Retarding the ignition

• Canceling individual cylinders by fuel injection cutout.

The DSC III control unit determines the amount of torque reduction that is

necessary and sends the request for regulation to the DME via the CAN bus.

ADB Brake Intervention

The ADB is an automatic differential lock that improves traction. The slipping wheel is

braked by pressure built up in the hydraulic unit. The drive torque can be transferred to the

wheel with the greater traction, which can transmit drive power to the road. This function

acts much like a limited slip differential.

Brake intervention is applied to the individual wheel which is loosing traction by

regulating the brake calipers in three phases:

• Pressure Build

• Pressure Hold

• Pressure Release

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BMW X5 2001 Bedienungsanleitung Seite 18