Component description for radar sensors control unit

P30.30-2508-06

Location

The radar sensors control unit is located in the trunk on the left sidewall.

Tasks

The radar sensors control unit is the evaluation and arithmetic unit for the short range and long range radar as well as the object and lane data of the stereo multifunction camera (A40/13). This in turn means that the radar sensors control unit is responsible for the following tasks :

 Reading in of sensors and signals

 Evaluation of input factors

 Control of systems

 Output of signals

Reading in of sensors and signals

The input factors are received via the following connections:

 Suspension FlexRay (Flex E)

 Radar CAN 1 (CAN S1)

 Radar CAN 2 (CAN S2)

Chassis FlexRay

The radar sensors control unit receives the following information via the chassis FlexRay:

 Long range radar radar data

 Diagnostic data from long range radar

 Status of the accelerator pedal

 Gear range status

 Stage status

 Service brake, status

 Yaw rate status

 Status information from the driver assist or driving safety system

 Wheel speeds and wheel rotation direction

 Brake torque

 Drive torque

 Tire pressure (for code 475 (Tire pressure monitor))

 Tire pressure loss warning (RDW) (for code 477 (Tire pressure loss warning))

 Parking brake status

 Steering wheel angle status

 Position data from navigation (for the Western Europe version)

 Driver request through the cruise control lever (S40/4)

 Driver request via menu settings in the instrument cluster (A1)

 Turn signal status (for code 237 (Active Blind Spot Assist))

 Lane data (with CODE 238 (Active Lane Keeping Assist))

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

Radar CAN 1

The signals for the following assembly parts are received via the radar CAN 1:

 Left front bumper radar sensor (B29/2)

 Right front bumper radar sensor (B29/3)

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

Radar CAN 2

The signals for the following assembly parts are received over the radar CAN 2:

 Left rear bumper radar sensor (B29/6)

 Right rear bumper radar sensor (B29/7)

 Center rear bumper radar sensor (B29/10)

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 assembly parts are then actuated.

Control of systems

The radar sensors control unit actuates the following systems to match the particular equipment involved:

 Variable Speed Limiter function (Speedtronic) (without code 494 (USA version))

 Permanent speed limiter (e. g. for winter tires)

 DISTRONIC PLUS with Steering Assist and Stop & Go Pilot (with code 266 (DISTRONIC PLUS with Steering Assist and Stop & Go Pilot function))

 BAS PLUS (for code 268 (BAS PLUS))

 BAS PLUS with intersection assist (for code 269 (BRAKE ASSIST PLUS CROSSING TRAFFIC (BAS+Q)))

 PRE-SAFE® brake (for CODE 300 (PRE-SAFE® system))

 Pedestrian protection emergency braking function (with CODE 271 (Autonomous intervention by the brake system / pedestrian protection))

 Rear end PRE-SAFE (with CODE 253 (Rear-end collision warning and protection system))

 Active Blind Spot Assist (with CODE 237 (Active Blind Spot Assist))

 Active Lane Keeping Assist (with CODE 238 (Active Lane Keeping Assist))

Output of signals

The signals are issued over the following connections:

 Chassis FlexRay

 Radar CAN 1 and radar CAN 2

Chassis FlexRay

With code 266 (DISTRONIC PLUS with Steering Assist and Stop & Go Pilot), the radar sensors control unit sends the following signals, among others, via the chassis FlexRay:

 Increase in the drive torque

 Reduction in the drive torque

 Driving stages limitation

 Stage increase

 Stage reduction

 Warning tone output

 System and warning indicators output

 Request for PRE-SAFE measures

 Request to the parking brake

 Radar requirements of the long range radar (vehicle / operation-specific data

 Diagnosis request

With code 237 (Active blind spot assist), the radar sensors control unit sends the following signals via the chassis FlexRay:

 Wheel selective intervention by the brake system

 Activation of left Blind Spot Assist warning lamp (M21/1e2) or right Blind Spot Assist warning lamp (M21/2e2)

 Warning tone output

 System and warning indicators output

 Radar requirements of the long range radar (vehicle / operation-specific data

 Diagnosis request

For code 238 (Active lane keeping assist), the radar sensors control unit sends, amongst other things, the following signals via the chassis FlexRay:

 Wheel selective intervention by the brake system

 Warning tone output

 System and warning indicators output

 Radar requirements of the long range radar (vehicle / operation-specific data

 Diagnosis request

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

Radar CAN 1 and radar CAN 2

The radar sensors control unit sends the following signals amongst others via radar CAN 1 and radar CAN 2:

 Radar requirements of the short range radar (vehicle / operation-specific data)

 Diagnosis request

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