Distronic Distance-Pilot Controller Unit, Component Description - GF30.30-P-3218FG

Model 213 

up to model year 2021 

with code 239 (Adaptive cruise control Pro (DISTRONIC PRO)) 

Location 

The DISTRONIC Distance-Pilot controller unit is located in the middle in front of the cooler.

Task 

The DISTRONIC Distance-Pilot 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 speed limiter (except code 494 (USA version))
• Permanent limiter
• DISTRONIC PLUS
• Distance warning
• Brake assistant

The DISTRONIC Distance-Pilot 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 Distance-Pilot controller unit sends the respective requests for acceleration, deceleration and switching via the chassis FlexRay (Flex E) after evaluation of all input factors.

This means that the DISTRONIC Distance-Pilot controller unit has the following tasks:

• Reading in input factors 
• Evaluation of input factors 
• Actuation of assembly parts 
• Transmission of initial parameters 

Reading in input factors 

The DISTRONIC Distance-Pilot controller unit receives the following input signals via chassis FlexRay, among other things:

• Operating condition for engine/drivetrain
• Gear range engaged
• Parking brake status
• Engine drive torque
• Braking 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

Evaluation of input factors 

The input factors are evaluated by the microprocessor and the corresponding components are actuated.

Actuation of assembly parts 

The DISTRONIC Distance-Pilot controller unit actuates the interval Pilot DISTRONIC controller unit heater (R61/2) over a direct line (pulse width modulated).

Transmission of initial parameters 

The DISTRONIC Distance-Pilot controller unit sends the following initial parameters via the chassis FlexRay, among other things:

• System status of DISTRONIC PLUS
• Object information
• Request to increase/reduce engine torque
• Request to increase/limit gear range
• 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))

Body 

The DISTRONIC Distance-Pilot controller unit contains the following assembly parts:

• Long range radar
• Control unit

Properties of the long range radar:

• Detection range:
  • s < 45 m for a detection angle of ∠ = 45°
  • s = 45 to 200 m for a detection angle of ∠ = 9°
• Carrier frequency: 77 GHz (in accordance with the "Pulse Doppler Principle" for independent measurement of distance and speed)

The DISTRONIC Distance-Pilot controller unit must be newly adjusted after exchange (e.g. after an accident repair) using the integrated "service adjustment mode".

Wiring diagram for DISTRONIC Distance-Pilot controller unit

PE30.30-P-2107-97DBA