AIRmatic, function - GF32.22-P-0003E
MODEL 211 with CODE (489a) Airmatic (semi-active air suspension)
Die Airmatic Dual Control is a fully-supporting air suspension system.
"DC" (Dual Control) means that both the suspension and the damping can be adjusted.
Depending on the road surface condition and driving style an additional air volume is switched to or away from the suspension struts. This causes a change in spring rate.
The system provides both static and dynamic support by means of four air bellows located at the wheels.
The AIRmatic system also features the following additional functions:
- The level control allows both manual and speed-responsive, automatic raising/lowering of the vehicle level.
- The electronic level control system controls the vehicle level at the front and rear axles and ensures the vehicle level remains constant according to the driving and vehicle loading conditions.
- The "Adaptive Damping System" (ADS) adapts the damping forces to the road surface condition and the driving style. The road conditions are determined by vertical acceleration pickups at the body of the vehicle. The driving style (horizontal acceleration) is calculated using the vehicle speed and turn angle. The damping is adjusted to the sporty damping stage at a speed of >160 km/h.
Advantages
- Higher level of driving safety and ride comfort due to:
- Adaptation of suspension to road surface condition and driving style.
- Adapting damping to road conditions and driving style.
- Low location of center of gravity.
- Low aerodynamic drag and therefore low fuel consumption.
- Less lift at front axle.
- Individual adaptation due to:
- Raising vehicle level for poor road surfaces or driveways.
- 3 possible damping levels for comfortable, sporty or extremely sporty driving style.
- Driver information:
- Higher vehicle level and sporty damping level displayed by means of indicator lamps in switches.
- Warning appears on multifunction display in instrument cluster if vehicle level is too low.
Function overview
The functions of the pneumatic closed loops are controlled using the components of the electric/electronic system.
The AIRmatic control module receives input signals from the following components:
- ESP control module (via CAN)
- Engine control module (via CAN)
- Transmission control module (via CAN)
- Central gateway control module (via CAN)
- Instrument cluster (via CAN)
- Steering angle sensor (via CAN)
- Comfort and SPORT switch (via CAN)
- Level adjustment switch (via CAN)
- 3 body acceleration sensors
- 2 front axle level sensors
- 1 rear axle level sensor
- 1 AIRmatic pressure sensor
- Voltage supply and ground
In the AIRmatic control module, the input signals are converted into output signals for the following components:
- 4 level valves (assigned to wheel)
- 4 additional volume valves (assigned to wheel)
- 1 AIRmatic central reservoir charge valve
- 1 AIRmatic pressure reduction valve
- 4 ADS damping valves (each with 2 solenoid valves, assigned by wheel)
- Multifunction display in instrument cluster
- Indicator lamps in the switches: comfort and sport, level adjustment
- Air compressor
The AIRmatic control module uses the input signals to decide which of the 4 functions must be controlled:
- Self-leveling suspension
- Level adjustment
- Additional volume added and removed
- ADS
is to be activated.
Several control functions can be processed at the same time.
| AIRmatic driver information | GF32.22-P-0003-01E | ||
| AIRmatic, location of pneumatic/hydraulic components | GF32.22-P-0003-02E | ||
| AIRmatic, location of electrical/electronic components | GF32.22-P-0003-03E | ||
| CAN signals, AIRmatic control module | AD32.22-P-2000-04A | ||
| Level adjustment, function | GF32.22-P-4005E | ||
| AIRmatic level adjustment, function | Model 211 except |
GF32.22-P-4004B | |
| Model 211 |
AF32.22-P-4004E | ||
| Adaptive damping system (ADS II), function | GF32.32-P-0001B |