Active Brake Assist Controller Unit, Component Description - GF30.30-P-3222RFM
Model 205
as of model year 2019
with code 258 (Active Brake Assist System)
Model 253 (except 253.99)
as of model year 2020
with code 258 (Active Brake Assist System)
Shown on model 205.0 with code P23 (EXCLUSIVE Exterior)
Except code P23 (EXCLUSIVE Exterior), shown on model 205.3 with code P76 (standard equipment exterior)
Location
With code P23 (EXCLUSIVE Exterior), the Active Brake Assist controller unit is located to the front right behind the bumper.
Except code P23 (EXCLUSIVE Exterior), the Active Brake Assist controller unit is located to the front 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 drive train 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)
- Driver request via menu settings in the instrument cluster (A1)
The resulting functions are described in the respective function descriptions (see also the appropriate block diagram or function schematic).
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 visual warning messages and warning tones via the instrument cluster
- Request to initiate PRE-SAFE® measures (with code 299 (PRE-SAFE® system))
- Request to increase the braking torque
- Request for torque reduction
The functions that use these signals are described in the individual function descriptions (see the appropriate 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 ∠ = 45°
- 77 GHz radar sensor operating on the pulse Doppler principle for independent measurement of distance and speed
The Active Brake Assist controller unit must be newly adjusted after being replaced (e.g. after an accident repair) via the integrated "service adjustment mode."
| Wiring diagram for Active Brake Assist controller unit | PE30.30-P-2108-97FBA |