Component Description For Distronic Electric Controller Unit - GF30.30-P-3213RF
Model 205
up to model year 2019
with code 239 (Active Distance Assist DISTRONIC)
Model 253 (except 253.99)
up to model year 2020
with code 239 (Active Distance Assist DISTRONIC)
Shown on model 205
Location
The DISTRONIC controller unit is located in the middle of the radiator.
Tasks
The DISTRONIC controller unit assesses the traffic situation ahead of the vehicle through evaluation of the data from the integral long range radar. The detected data serve to implement the following functions:
- Cruise control
- Variable SPEEDTRONIC (except code 494 (USA version))
- Permanent limiter
- DISTRONIC PLUS
- Distance warning
- Adaptive Brake Assist
The DISTRONIC controller unit compares the permanent target and actual values with each other and evaluates the respective driver requirements. In order to implement the automatic distance and speed control the DISTRONIC controller unit sends the respective requests for acceleration, deceleration and switching over the suspension FlexRay (Flex E) after evaluation of all input factors.
This means that the front DISTRONIC controller unit has the following tasks:
- Reading in input factors
- Evaluation of input factors
- Transmission of initial parameters
Reading in input factors
The DISTRONIC controller unit receives the following input signals via the suspension FlexRay:
- Operating condition for engine/drivetrain
- Driving stage engaged
- Parking brake status
- Engine drive torque
- Brake torque
- Acceleration/yaw rate
- Driver request through the cruise control lever (S40/4)
- Driver request to overtake through setting the turn signal
- Vehicle speed/acceleration
- Steering wheel angle
- Brake pedal position
- Accelerator pedal position
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
Amongst other things the DISTRONIC controller unit sends the following initial parameters over the suspension FlexRay:
- System status of DISTRONIC PLUS
- Object information
- Request to increase/reduce engine torque
- Request for gear change
- Request to increase/reduce braking torque
- Request to emit warning tones, system or warning messages
- Requests to introduce PRE-SAFE® measures (with CODE 299 (PRE-SAFE® system))
The functions that use these signals are described in the individual function descriptions (see the appropriate block diagram or function schematic).
Structure
The DISTRONIC controller unit contains the following assembly parts:
- Long range radar
- Control unit
Properties of the long range radar:
- Detection ranges:
- s < 30 m with a detection angle of ∠ = 30°
- s = 30 to 100 m with a detection angle of ∠ = 20°
- s = 100 to 200 m with a detection angle of ∠ = 12°
- Carrier frequency: 77 GHz (in accordance with the "Pulse Doppler Principle" for independent measurement of distance and speed)
The DISTRONIC controller unit must be newly adjusted after exchange (e.g. after an accident repair) using the integrated "service adjustment mode".
| Wiring diagram for Distronic (DTR) control unit | Model 205 with engine 274, 651 up to model year 2019 with code 239 (Active Distance Assist DISTRONIC) Model 253 (except 253.99) with engine 274, 651 up to model year 2020 with code 239 (Active Distance Assist DISTRONIC) | PE30.30-P-2101-97FBA |