Distance Control Controller Unit, Basic Function - GF30.30-P-9891A

Model all (CAR) 

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

Courtesy of MERCEDES-BENZ USA

Location 

The Active Distance Assist DISTRONIC electric controller unit is located at the center behind the radiator grille.

Task 

The multi-range radar in the Active Distance Assist DISTRONIC electric controller unit detects the traffic situation in front of the vehicle.

The Active Distance Assist DISTRONIC electric controller unit processes the data of the multi-range radar for the implementation of the following functions:

• Distance control
• Collision warning
• Autonomous partial braking and maximum full-stop braking The Active Distance Assist DISTRONIC electric controller unit is connected to the network architecture of the vehicle.

For the execution of the functions, the Active Distance Assist DISTRONIC electric controller unit processes the following information:

• Operating condition for engine/drivetrain
• Driving stage engaged
• Active transmission mode
• Parking brake status
• Vehicle speed
• Operating requests
• Brake system status
• Accelerator pedal position
• Engine drive torque
• Steering wheel angle

The Active Distance Assist DISTRONIC electric controller unit evaluates these input factors and transmits the following information and requests:

• System status
• Object information
• Requests:
  • Increase/reduce engine torque
  • Expand/limit drive range
  • Increase/reduce the braking torque
  • Brakes
  • Show system and/or warning messages, output warning tones
  • Status queries, diagnosis

Structure 

The Active Distance Assist DISTRONIC electric controller unit contains the following component parts:

• Multi-range radar
• Controller unit
• Radome heater

The multi-range radar has the following features:

• Detection range:
  • 40 m for a detection angle of 45°
  • 160 m for a detection angle of 7.5°
• Detection range (from FAP5/introduction of model series 223):
  • 70 m for a detection angle of 45°
  • 250 m for a detection angle of 9°
• Operating frequency: 77 GHz

  The multi-range radar works according to the Pulse-Doppler principle for the independent measurement of the distance and speed.

The Active Distance Assist DISTRONIC electric controller unit must be readjusted after replacement (e. g. after accident repair).