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


Vertical Dynamics Systems

Vertical Dynamics Systems


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


     Vertical Dynamics Control (VDC)

    Control Unit Fig. 124: Identifying VDM INDEX REFERENCE CHART VDM The location of the VDM control unit is dependent on the country in which the vehicle is sold. On left-hand drive vehicles the c

     Electronic Ride-Height Control

    Function of Air Springs The various control modes on the F01/F02 are similar to those on other model series such as the E70: Fig. 131: EHC Control Mode Flowchart, F01/F02 Control Modes with Single-a

     Electronic Ride-Height Control (EHC)

    Control Unit The EHC control unit is located in a module carrier in the rear of the luggage compartment on the right-hand side. Fig. 132: Identifying Air Supply (LVA) And EHC Control Module On Mount


     Installing Servodrive

    Installation: If necessary, align shaft of flap(s) to be actuated to position of servodrive to be installed. Fig. 4: Identifying Servodrive Position OVERVIEW OF ACTUATOR DRIVES ON HEATER/AIR CONDITIONER Fig. 5: Identifying Actuator Drives On Heater/Air Conditioner Components Actuator drive, ven

     Turning Lights

    The turning light function is available only in connection with the option Adaptive Headlight. In addition to the adaptive headlights, the turning light additionally illuminates the area in front of and beside the vehicle. The turning light makes it possible to recognize persons or traffic situat

    © 2019-2024 Copyright