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

Model All (CAR) 

Example illustration of Active Distance Assist DISTRONIC electric controller unit 

Courtesy of MERCEDES-BENZ USA

Overview 

This document contains information on:

• General 
• Function 
  • Multi-range radar 
  • Controller unit 

General 

The Active Distance Assist DISTRONIC electric controller unit (1) records the traffic situation in front of the vehicle, processes various pieces of vehicle-internal information, assesses it, and transmits information and requests to other component parts.

The Active Distance Assist DISTRONIC electric controller unit (1) includes the following component parts:

• Multi-range radar
• Controller unit
• Radome heater

Function 

Multi-range radar 

The multi-range radar in the Active Distance Assist DISTRONIC electric controller unit (1) records the traffic situation in front of the vehicle.

The multi-range radar has the following features:

• Detection range:
  • 40 m for a detection angle of 45°
  • 160 m at 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 at 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.

Controller unit 

The Active Distance Assist DISTRONIC electric controller unit (1) processes the data of the multi-range radar to implement the following functions:

• Distance control
• Collision warning
• Autonomous partial braking and maximum full-stop braking

The Active Distance Assist DISTRONIC electric controller unit (1) is connected to the network architecture of the vehicle.

In order to execute the functions, the Active Distance Assist DISTRONIC electric controller unit (1) 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 (1) 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 braking torque.
  • Brakes
  • Show system and/or warning messages, output warning tones.
  • Status queries, diagnosis

After a replacement (e.g. after an accident repair), the Active Distance Assist DISTRONIC electric controller unit (1) is readjusted.

	Component descriptions
	Long-range radar sensor, component description	Model 223	GF30.30-P-3125A
		Model 206	GF30.30-P-3125C
		Model 297	GF30.30-P-3125D
		Model 295	GF30.30-P-3125E
		Model 232	GF30.30-P-3125F
		Model 296	GF30.30-P-3125G
		Model 254	GF30.30-P-3125H
		Model 214	GF30.30-P-3125K
		Model 294	GF30.30-P-3125N