Active Brake Assist Controller Unit, Component Description - GF30.30-P-3222FR
Model 257, 290 up to model year 2021 with code 258 (Collision warning system with active brake application FCW-Stop)
Shown on model 257
Location
The Active Brake Assist controller unit is located in the center in front of the cooler.
Tasks
The Active Brake Assistant controller unit detects obstacles and vehicles moving immediately ahead and warns the driver about a possible collision.
If the Active Brake Assistant controller unit detects a risk of collision, it initiates autonomous brake application.
This results in the following tasks for the Active Brake Assistant controller unit:
- Reading in input factors
- Evaluation of input factors
- Transmission of initial parameters
Reading in input factors
The Active Brake Assistant controller unit receives the following input factors via periphery CAN (CAN PER), among other things:
- Engine running or drivetrain operational
- Terminal status of terminal 15
- Wheel speed and wheel rotation direction
- Acceleration/yaw rate
- ESP® status
- Steering wheel angle and steering wheel velocity
- Accelerator pedal position
- Brake pedal position
- Switch position of combination switch (S4)
The resulting functions are described in the respective function descriptions (see also block diagram or function schematic).
- Driver request via menu settings in the instrument cluster (A1)
Evaluation of input factors
The input factors are evaluated by the microprocessor and the corresponding assembly parts are actuated.
Transmission of initial parameters
The Active Brake Assistant controller unit sends the following initial parameters via periphery CAN, among other things:
- Requests to output optical and acoustic warning messages in instrument cluster
- Requirements for initiating PRE-SAFE® measures
- Request to increase the braking torque
- Request for torque reduction
The functions that use these signals are described in the individual function descriptions (see block diagram or function schematic).
Structure
The Active Brake Assistant controller unit contains the following assembly parts:
- Radar sensor
- Control unit
Properties of the radar sensor:
- Detection angle of radar sensor: s = 0 up to 160 m with a detection angle of 4 = 45°
- 76 GHz radar sensor operating on the pulse Doppler principle for independent measurement of distance and speed
The Active Brake Assistant controller unit must be newly adjusted after exchange (e.g. after an accident repair) using the integrated "service adjustment mode".
| Wiring diagram for Active Brake Assist controller unit | PE30.30-P-2108-97XBA |