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

GF32.32-P-0002CW Adaptive damping system (ADS), function
- with CODE (483) ADVANCED AGILITY package

General function requirements
^ Circuit 15 On

Adaptive damping system (ADS), general
The adaptive damping system (ADS) adapts the damping forces of the shock absorbers to the road surface condition, driving style and chosen settings.

The driver can choose between a sporty or comfort-oriented suspension.

The system is made up of the following subfunctions:
^ Function sequence, damping mode selection
^ Function sequence, measurement of driving conditions
^ Function sequence, shock absorber adjustment

Function sequence, damping mode selection
A sporty or comfort-oriented suspension can be selected by actuating the vehicle dynamics button (N72/1 s23) on the upper control panel control unit (N72/1).

The information is transferred to the front SAM control unit with fuse and relay module (N10/1) by the upper control panel control unit via the instrument panel LIN (LIN 1) and from there to the adaptive damping system control unit (N51/5) via the chassis CAN (CAN E). If the Sport variant is selected, the light-emitting diode (LED) integrated in the vehicle dynamics button lights up.

Pressing the vehicle dynamics button again selects Comfort mode and the LED goes out.

Additional function requirements for driving condition
^ Circuit 61 ON

Function sequence, measurement of driving conditions
The adaptive damping system control unit determines the current vehicle level and shock absorber speeds via the left front level sensor (B22/8), right front level sensor (B22/9), left rear level sensor (B22/7) and right rear level sensor (B22/10).

The vehicle body acceleration and body speed are determined via the left front body acceleration sensor (B24/3), right front body acceleration sensor (B24/4) and left rear body acceleration sensor (B24/5).

In addition, information from the following control units is transferred to the adaptive damping system control unit via the chassis CAN:
^ Electronic Stability Program control unit (N30/4)
^ Steering column module control unit (N80)
^ CDI control unit (N3/9) (with diesel engine) or ME-SFI [ME] control unit (N3/10) (with gasoline engine)
^ Instrument cluster (A1)

The following information is transferred to the adaptive damping system control unit via the chassis CAN:
^ Electronic Stability Program control unit
- Vehicle longitudinal/lateral acceleration
- Yaw rate
- Wheel speeds
- Brake status
- Braking torques
^ Steering column module control unit
- Steering angle
- Steering angle rate of change
^ CDI control unit or ME-SFI [ME] control unit
- Drive variant
- Kickdown request (on transmission 722)
^ Instrument cluster
- Vehicle speed (redundant signal)
^ Front SAM control unit with fuse and relay module
- Body variant

The Electronic Stability Program control unit receives information about vehicle longitudinal/lateral acceleration and yaw rate from the yaw rate, lateral and longitudinal acceleration sensor (B24/15) via the vehicle dynamics CAN (CAN-H).

The wheel speeds are determined by the Electronic Stability Program control unit using the signals from the left front axle rpm sensor (L6/1), right front axle rpm sensor (L6/2), left rear axle rpm sensor (L6/3) and right rear axle rpm sensor (L6/4).

Additional function requirements for shock absorber adjustment
^ Circuit 61 ON

Function sequence, shock absorber adjustment
Based on the input signals, the adaptive damping system control unit determines the optimal damping stage for each shock absorber and directly actuates the left front axle damping valve unit (Y51), right front axle damping valve unit (Y52), left rear axle damping valve unit (Y53) and right rear axle damping valve unit (Y54) accordingly.