COLLISION PREVENTION ASSIST controller unit, component description - GF30.30-P-3214FQM
MODEL 218 as of model year 2015 with CODE 258 (COLLISION PREVENTION ASSIST PLUS)
Location
The COLLISION PREVENTION ASSIST controller unit is located in the direction of travel at the rear right to the front bumper.
Task
The COLLISION PREVENTION ASSIST controller unit detects obstacles and vehicles ahead and warns the driver about a possible collision.
If the COLLISION PREVENTION ASSIST controller unit detects a risk of collision, it initiates autonomous braking.
This results in the following tasks for the COLLISION PREVENTION ASSIST controller unit:
- Reading in input factors
- Evaluation of input factors
- Transmission of initial parameters
Reading in input factors
The COLLISION PREVENTION ASSIST controller unit also receives the following input factors via chassis CAN 1:
- Wheel speed and wheel rotation direction
- Steering angle
- Accelerator pedal position
- Status of brake pedal
- Driver request via menu settings in the instrument cluster (A1)
The resulting functions are described in the respective function descriptions (see also block diagram or function schematic).
Evaluation of input factors
The integrated microprocessor evaluates the input factors.
Transmission of initial parameters
The COLLISION PREVENTION ASSIST controller unit also transmits the following initial parameters via chassis CAN 1:
- 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).
Body
The COLLISION PREVENTION ASSIST controller unit includes the following components:
- Radar sensor
- Control unit
Properties of the radar sensor:
- Detection range of the radar sensor: s = 0 to 80 m for a detection angle of ∠ = 18° 8°
- 25 GHz radar sensor operating on the pulse Doppler principle for independent measurement of distance and speed
The COLLISION PREVENTION ASSIST controller unit must be newly adjusted after exchange (e.g. after an accident repair) using the integrated "service adjustment mode".