Intelligent radar sensor control unit, component description - GF30.30-P-3305FL

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MODEL 212.0/2 up to 28.2.13 with CODE (234) Blind Spot Assist as of model year 2011 /YoM 10

Location

The left radar sensor is mounted on the left on the left inner side of the rear bumper while left radar sensor is mounted on the right on the right inner side of the rear bumper.

Fig 1: Intelligent Radar Sensor Control Unit - Model 212.0/2

Courtesy of MERCEDES-BENZ USA

Task

The radar sensors detect vehicles in the blind spot via the integrated radar sensor system.

The radar sensors are ultra wideband radar sensors with the following properties:

Radar sensor detection range 0.18 m to 3 m at a resolution of 0.04 m
Detection angle of 60° with angle measurement and 130° with detection only
Radar sensor with 24.125 GHz carrier frequency
Operation: short pulse method with 5 GHz bandwidth

The radar sensors work according to the Master/Slave principle. The master or slave function can be determined via the connector coding. The master function is determined for the right radar sensor.

In other words, the left radar sensor transmits its information via the front end CAN (CAN G) to the right radar sensor, which evaluates the information from both radar sensors passes on the corresponding requests or data via the front end CAN to the control units affected.

The radar sensor also have the following tasks:

Reading in of sensors, pickups and signals
Evaluation of input factors
Output of signals

Reading in of sensors, pickups and signals

The input factors are read in via the following connection:

Front end CAN

Front end CAN

For example the radar sensors receive the following information via the front end CAN:

Terminal status of terminal 15
Status of engine control
Status of function "Blind Spot Assist"
Wheel speeds and wheel rotation direction
Global Positioning System (GPS) signals
Flasher status
Trailer status (for code (550) Trailer hitch)

The functions that use these signals are described in the individual function descriptions (see block diagram or function schematic).

Evaluation of input factors

The input factors are evaluated by the integrated microprocessors and the relevant components are then actuated.

Output of signals

Signals are output via the following connection:

Front end CAN

Front end CAN

The LH radar sensor transmits the following signals via the front end CAN:

Blind Spot Assist warning output, request
Operating condition, status

The right radar sensor transmits the following signals via the front end CAN:

Warning buzzer' request (A1h1)
Request for the multifunction display (A1p13)
Request to the left Blind Spot Assist readiness and warning indicator (M21/1e2) and the right Blind Spot Assist readiness and warning indicator (M21/2e2)

The left radar sensor transmits detection data to the right radar sensor via the front end CAN which uses it to generate the requests to emit a warning.

Wiring diagram for intelligent radar sensor

PE54.71-P-2100-97DAA