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Adaptive damping system (ADS), function - GF32.32-P-0002CE

MODEL 204.0 /2 with CODE (483) ADVANCED AGILITY package as of model year 2009 /YoM 08 

MODEL 204.0 /2 with CODE (483) ADVANCED AGILITY package as of model year 2012 /YoM 11 model refinement package 

MODEL 204.3 with CODE (483) ADVANCED AGILITY package 

Function requirements, general 

IMPORTANT The electronic ignition lock control unit makes available the circuit status of circuit 15 (N73) on the chassis CAN (CAN E).

Adaptive damping system (ADS), general 

The adaptive damping system alters the damping characteristics of the dampers to match the selected driving style damping mode and the road surface condition. In doing so a choice can be made between a sporty or a comfortable suspension tuning.

The ADS system is made up of the following component functions:

IMPORTANT The CDI control unit (N3/9) (on diesel engine) or the ME-SFI [ME] control unit (N3/10) (on gasoline engine) sends the status of circuit 61 to the chassis CAN.

IMPORTANT The Electronic Stability Program control unit (N30/4) will be introduced into service as of 1.3.2011 (model 204.0/2) or as of 1.6.2011 (model 204.3) in 2 variants:

Up to 28.2.2011 only the Electronic Stability Program control unit

Basis variant will be used in service.

Record additional function requirements for driving condition 

Record function sequence for driving condition 

The driving condition is defined through the following variables:

The vehicle level and damping speed are recorded by the following sensors:

The vehicle body acceleration is recorded by the following sensors:

The adaptive damping system control unit (N51/5) reads in the signals of the listed sensors directly.

The data of the yaw rate sensor for lateral and longitudinal acceleration (B24/15) (model 204.0/2 up to 28.2.2011, model 204.9, model 204.0/2 as of 1.3.2011 (with code (233) DISTRONIC PLUS), model 204.3 (with code (233) DISTRONIC PLUS)) are read in by the Electronic Stability Program control unit over the vehicle dynamics CAN (CAN H). For the ABR standard system (model 204.0/2 as of 1.3.2011, model 204.3 as of 1.6.2011) the yaw rate sensor for lateral and longitudinal acceleration is integrated into the Electronic Stability Program control unit which in turn means that the CAN connection to an external yaw rate sensor for lateral and longitudinal acceleration is no longer required. The data for the rotational speed, lateral and longitudinal acceleration are therefore recorded and evaluated directly by the Electronic Stability Program control unit (ABR standard system). The data for rotational speed, lateral and longitudinal acceleration are sent to the adaptive damping system control unit on the chassis CAN.

The Electronic Stability Program control unit also sends information on the wheel speeds, brake status and the braking torque over the chassis CAN to the adaptive damping system control unit.

This information is used for computation of the vehicle speed and the probable chassis movement.

The adaptive damping system control unit also receives the following information over the chassis CAN, which is used for calculating the ideal damping stage or damping force at each of the dampers:

Select function sequence for damping mode 

Pressing the vehicle dynamics button (N72/1s23) on the upper control panel control unit (N72/1) enables a choice to be made between a sporty or a comfortable suspension tuning.

The status of the vehicle dynamics button is read in by the front SAM control unit over the instrument panel LIN (LIN 1) and forwarded over the chassis CAN to the adaptive damping system control unit. The adaptive damping system control unit receives the corresponding request and generates the required actuation signals for the actuators. If the "SPORT" mode is selected, the LED integrated into the vehicle dynamics button goes on. The adaptive damping system control unit sends the request for actuation of this LED over the chassis CAN to the front SAM control unit. The front SAM control unit actuates the LED in the vehicle dynamics button over the instrument panel LIN. If the vehicle dynamics button is pressed again for the "COMFORT" mode, the LED in the vehicle dynamics button goes off.

Additional function requirements for shock absorber adjustment 

Function sequence, shock absorber adjustment 

The input signals are used by the adaptive damping system control unit to determine each ideal damping stage and directly actuates the following components accordingly:

Implementation of the continuous damping adjustment is realized using twin-tube gas-operated shock absorbers. The damping valve units are located at the bottom side on the twin-tube gas-operated shock absorbers.

The main pistons and the bottom valve of the twin-tube gas-operated shock absorbers each have a check valve integrated into them.

These check valves ensure that an identical flow direction is given through the damping valve unit, both in the rebound and the compression stages. This design enables the damping valve unit of a shock absorber to consist of a single regulated proportional valve only.

The flow area in the damping valve unit can be continuously adjusted through actuation of this proportional valve. More or less oil can flow through the damping valve unit to match the cross section. The damping behavior then becomes correspondingly softer or harder.

REFER TO SYSTEM WIRING DIAGRAMS Electrical function schematic for adaptive damping system (ADS) PE32.32-P-2051-97FAB 
  Adaptive damping system (ADS), location of components GF32.32-P-0002-01CE 
  Adaptive damping system (ADS), block diagram GF32.32-P-0002-02CE 
  Overview of system components for adaptive damping system (ADS) component description GF32.32-P-9998CE 
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