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Adaptive Damping System (ADS), Function - GF32.32-P-0002RDA

Model 172.4 as of model year 2017 with code 483 (ADVANCED AGILITY package) 

G13845693Courtesy of MERCEDES-BENZ USA

Block diagram 

Function requirements general 

IMPORTANT The "Circuit 15 ON" status is placed on chassis CAN 1 by the electronic ignition lock control unit.

The vehicle body acceleration is recorded by the following components:

Adaptive damping system (ADS), general 

The ADS is a combination of steel suspension with continuous damper adjustment.

The damping characteristic is adapted on a wheel specific basis to the road surface condition and the driving style to match the selected damping mode.

The damping mode can be selected by the driver at the press of a button, whereby the last selected setting is retained after a driving cycle.

The ADS consists of the following component functions:

IMPORTANT The CDI control unit (with diesel engine) or ME-SFI control unit 1 (with gasoline engine) makes the circuit status available on chassis CAN 1.

With the ADAPTIVE BRAKE premium system, the data from the turn rate, lateral acceleration and longitudinal acceleration sensor (with code 239 (DISTRONIC PLUS)) is read in by the Electronic Stability Program control unit via the vehicle dynamics CAN. With the ADAPTIVE BRAKE basic system (except code 239 (DISTRONIC PLUS)), the turn rate, lateral acceleration and longitudinal acceleration sensor is integrated in the Electronic Stability Program control unit, thereby making a CAN connection to an external turn rate, lateral acceleration and longitudinal acceleration sensor unnecessary. The data for turn rate, lateral acceleration and longitudinal acceleration is therefore collected and evaluated directly by the Electronic Stability Program control unit. 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 components:

The adaptive damping system control unit reads in the signals of the listed components directly. The vehicle's longitudinal acceleration and lateral acceleration is detected by the turn rate, lateral acceleration and longitudinal acceleration sensor (with ADAPTIVE BRAKE premium system) via the vehicle dynamics CAN or directly by the Electronic Stability Program control unit (with the ADAPTIVE BRAKE basic system). The data are sent by the Electronic Stability Program control unit to the adaptive damping system control unit over the chassis CAN 1. The Electronic Stability Program control unit also sends information on the wheel speeds, brake status and the braking torque over the chassis CAN 1 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 via chassis CAN 1; this information is used for calculating the ideal damping stage or damping force at each of the dampers:

Function sequence for selecting damping mode (except code B59 DYNAMIC SELECT) 

Pressing the vehicle dynamics button on the upper control panel control unit enables a choice to be made between a sporty or a comfortable suspension tuning.

The upper control panel control unit reads in the signal from the vehicle dynamics button directly and sends it via the instrument panel LIN and chassis CAN 1 with the interface for front SAM control unit with fuse and relay module 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 Sport mode is selected, the LED integrated in the vehicle dynamics button lights up. The adaptive damping system control unit sends the request for actuation of this LED via chassis CAN 1 to the front SAM control unit with fuse and relay module. The front SAM control unit with fuse and relay module actuates the LED in the vehicle dynamics button via the instrument panel LIN. If the "COMFORT" mode is selected by pressing the vehicle dynamics button again, the LED in the vehicle dynamics button goes out.

Function sequence for selecting damping mode (with code B59 (DYNAMIC SELECT)) 

The menu can be switched between the Comfort, Sport or Sport+ transmission modes by pressing the DYNAMIC SELECT button in the upper control panel control unit.

The signal from the DYNAMIC SELECT button is read in by the upper control panel control unit. The upper control panel control unit sends the signal via the instrument panel LIN, the front SAM control unit with fuse and relay module, chassis CAN 1, the ME-SFI control unit (with gasoline engine) or the CDI control unit (with diesel engine) and the drive train CAN to the fully integrated transmission control unit. The fully integrated transmission control unit places the information for the selected transmission mode on the drive train CAN. The adaptive damping system control unit receives the information and generates the required actuation signals for the actuators.

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 the ideal damping stage in each case and directly actuates the following components accordingly:

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

A check valve is integrated into the main pistons and the bottom valve of the twin-tube gas-filled shock absorber. 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 set cross section. The damping behavior then becomes correspondingly softer or harder.

  Electrical function schematic for ADVANCED AGILITY package   PE32.22-P-2051-97TAB 
  Overview of system components for adaptive damping system (ADS)   GF32.32-P-9997RDA 
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