GF30.30-P-3115-01K DTR Control Unit - Function

GF30.30-P-3115-01K DTR Control Unit - Function
- with CODE (219) Distronic (DTR)
- as of 1.6.04

Component Identification:

Do not mix up DTR control unit of the models 209, 215, 220 and the models 211, 219, 230. Observe the different connector.

The DTR control unit (A89) transmits radar signals and receives reflected waves from obstacles. The distances are determined based on the signal travel time of the received signals and the relative speeds to the target objects are determined based on the Doppler shift.

The angle of the object is also determined based on the radar lobe orientation and strength of the reflected radar beams.

The system is a three-beam radar with 3 electronically switchable transmission/reception lobes (opening angle for each of 3.4°). The transmission and reception channels operate sequentially. The detection range is about 150 meters.

The following vehicle data is transmitted over CAN-C to the DTR control unit to detect objects:
^ Rotational speeds of all wheels to determine the yaw rate when cornering and the vehicle speed
^ Steering angle and direction.

The DTR control unit (A89) transmits the information over the distance and the relative speed of the detected objects over the databus engine on the traction systems control unit, which performs the evaluation and decides whether to reduce/increase the engine torque or whether braking or a gear shift is required.

The DTR control unit (A89) receives its voltage supply on Pin 1 (terminal 87) and Pin 6 (ground). All input and output signals are exchanged over the CAN-C (databus engine). Output of data takes place
^ for the models 209, 215, 220
^ for the models 211, 219, 230
over two different interfaces. Any confusion between them is excluded based on different connectors on the DTR control unit (A89).

The function of the DTR control unit (A89) and communication over CAN-C is monitored and recognized errors are stored. Read out fault memory with STAR DIAGNOSIS.

Recognition and classification of target objects is only guaranteed if the DTR control unit (A89) is aligned in the horizontal and vertical direction to the vehicle-longitudinal axis.

Component Identification:

The radar transparent covering in the radiator grille optimizes the transmission and reception characteristics of the radar sensor. External influences from outside (for example through metallic material in front of the sensor) are suppressed.