BMW 7 Owners & Service Manuals

BMW 7 Series: Vertical Dynamics Control

General Information

When driven vigorously or on an uneven road surface, a vehicle tends to respond with undesirable body movements. BMW first developed Vertical Dynamics Control for the E70 and was able to effectively reduce such body motion as a result.

VDC improves the following driver-perception related vehicle characteristics according to road surface conditions:

  • Body-related ride comfort (primary ride comfort)
  • Roadwheel-related ride comfort (secondary ride comfort)
  • Dynamic handling (transitional response, agility) even with more comfortable suspension setting.

BMW is the first manufacturer to offer a damper adjustment system that is continuously controllable independently of damper compression/extension as is the case with the VDC (2) on the F01/F02.

The essential improvements compared with VDC (1) are:

  • 1 EDC control valve for damper extension control
  • 1 EDC control valve for damper compression control
  • "Pre-opening adjustment" for improved body stabilization (has adjustment effect even at low damper rates)
  • Driver-perceptible broad spread in conjunction with the handling setting switch (difference between soft and hard characteristics)
  • Separately adjustable characteristic for roadwheel-related ride comfort (extension characteristic independent of compression characteristic)

Vertical Dynamics Systems
Fig. 123: Identifying VDC Front Dampers

INDEX REFERENCE CHART

Vertical Dynamics Systems

Vertical Dynamics Systems

VDC DAMPER REFERENCE CHART

Vertical Dynamics Systems

Signal Processing

  • The vertical movement of the wheels is detected by the wheel-acceleration sensors integrated in the EDC satellite control units
  • From the wheel acceleration rates and the ride height signals (FlexRay bus) the vehicle body motion is calculated
  • In addition, signals such as the vehicle road speed are read from the FlexRay bus for the purpose of determining required damping forces.

Signal processing/VDC (2) controller

Individual damping forces are calculated for each individual wheel according to the vehicle body motion, the wheel motion and the additional signals read from the FlexRay bus, and are sent every 2.5 ms to the EDC satellite control units.

Damping Force Adjustment

  • Stored on each EDC satellite control module is the actual individual damper characteristic, making it possible to minimize differences from the specified characteristic arising from manufacturing tolerances
  • From the specified damping force and the damper characteristic data map, the EDC satellite control units calculate the required current to be applied to the damper extension valve and compression valve

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