GF30.30-P-3301LEB Component Description For Radar Sensors Control Unit

GF30.30-P-3301LEB Component Description For Radar Sensors Control Unit
- MODEL 216.3, 221.0 /1 up to 31.8.10
- with CODE (234) Blind Spot Assist as of model year 2009 / YoM 08
- MODEL 221.0 /1 (except 221.095 /195)
- with CODE (239) Autonomous intelligent cruise control Plus Light as of model year 2011 / YoM 10
- MODEL 221.095 /195
- with CODE (234) Blind Spot Assist as of model year 2011





Shown on model 221
N62/1 Radar sensors control unit (SGR)

Location
The radar sensors control unit is located at the bottom right side of the luggage compartment.

Task
The radar sensors control unit is the evaluation unit of the short range radar for vehicles with the following equipment installed:
- Code (233) Distronic Plus
- Code (234) Blind Spot Assist

The radar sensors control unit also evaluates data from the long range radar for vehicle with the following equipment installed:
- Code (233) Distronic Plus
- Code (239) Adaptive cruise control Plus Light

To do this the radar sensors control unit fulfills the following tasks:
- Reading in of sensors, pickups and signals
- Evaluation of input factors
- Control of systems
- Output of signals

Reading in of sensors, pickups and signals
The input factors are read in via the following connections:
- Chassis CAN (CAN E)
- Vehicle dynamics CAN (CAN H)
- Sensor CAN (CAN S)

Chassis CAN
The radar sensors control unit reads in the following information via the chassis CAN:
- Status of the accelerator pedal
- Status of the engine timing
- Drive position status
- Electronic Stability Program (ESP) status
- Yaw rate status
- Wheel speeds and wheel rotation direction
- Status information from the driver assist or driving safety system
- Parking brake status
- Status of steering angle
- Position data from navigation (for the Western Europe version)
- Driver request via CC [TPM] push button (S40/4)
- Driver request via menu settings in instrument cluster (A1)
- Status of the flasher (for code (234) Blind Spot Assist)
- Status of the trailer (for code (234) Blind Spot Assist and code (550) AHV)

The functions resulting therefrom are described in the corresponding function descriptions (see block diagram or function schematic).

Vehicle dynamics CAN
The signals from the following components are read in via the vehicle dynamics CAN:
- DTR controller unit (A89) (for code (233) DISTRONIC PLUS or code (239) Adaptive cruise control Plus Light)
- Long range radar radar data
- Diagnostic data from long range radar

The functions resulting therefrom are described in the corresponding function descriptions (see block diagram or function schematic).

Sensor CAN
The signals of the following components are read in via the sensor CAN:
- For code (233) DISTRONIC PLUS
- Radar sensor on the inside left, front bumper (A86/1b2)
- Radar sensor on the inside right, front bumper (A86/1b3)
- For code (234) Blind Spot Assist up to 31.8.09:
- Right inner radar sensor, rear bumper (A86/2b2)
- Left inner radar sensor, rear bumper (A86/2b3)
- For code (234) Blind Spot Assist as of 1.9.09:
- Radar sensor on the outside right, rear bumper (A86/2b1)
- Radar sensor on the outside left, rear bumper (A86/2b4)

The functions resulting therefrom are described in the corresponding 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.

Due to the high performance of the radar sensors control unit, it is equipped with two microprocessors (clock frequency 40 MHz each).

Control of systems
- Variable Speed Limiter function (Speedtronic) (except code (494) USA version)
- Permanent Speed Limiter (winter tires)
- DISTRONIC PLUS (for code (233) DISTRONIC PLUS)
- Adaptive cruise control (for code (239) adaptive cruise control Plus Light)
- Automatic deactivation of the radar sensor system (for the Western European version)
- Blind Spot Assist (for code (234) Blind Spot Assist)

Output of signals
The signals are issued over the following connections:
- Chassis CAN
- Vehicle dynamics CAN
- Sensor CAN

Chassis CAN
For code (233) DISTRONIC PLUS, the radar sensors control unit evaluates all input data and then takes on complete control of the vehicle's longitudinal movements, by sending signals for acceleration, deceleration and gear switching via the chassis CAN. Warning tones and display in the IC are also actuated by the radar sensors control unit and the PRE-SAFE measures are requested via the chassis CAN.

For code (234) Blind Spot Assist the radar sensors control unit actuates the left Blind Spot Assist readiness and warning indicator (M21/1e2) and the right Blind Spot Assist readiness and warning indicator (M21/2e2).

The functions resulting therefrom are described in the corresponding function descriptions (see block diagram or function schematic).

Vehicle dynamics CAN
As an example, for code (233) DISTRONIC PLUS the radar sensors control unit transmits the following signal via the vehicle dynamics CAN:
- Radar requirements of the long range radar (vehicle / operation-specific data)
- Diagnostic requirements for long range radar

The functions resulting therefrom are described in the corresponding function descriptions (see block diagram or function schematic).

Sensor CAN
The radar sensors control unit transmits the following signals via the sensor CAN:
- Radar requirements of the short range radar (vehicle / operation-specific data)

The functions resulting therefrom are described in the corresponding function descriptions (see block diagram or function schematic).