Controller Unit For Distance Warning Function With Active Brake Application, Component Description - GF30.30-P-3220KJ

MODEL 453.0/3/4

with CODE 258 (Active Brake Assist System)

Location

AWF controller unit with active intervention by the brake system is located in the middle in the lower radiator trim.

Fig 1: Distance Warning Function With Active Brake Application Control Unit Component Location

Courtesy of MERCEDES-BENZ USA

Task

The AWF controller unit with active intervention by the brake system assesses the traffic events ahead of the vehicle and in the process permanently determines the risk potential for a possible collision. This means that the AWF controller unit with radar sensor has the following individual tasks:

Reading in input factors
Evaluation of input factors
Transmission of initial parameters

Reading in input factors

The AWF controller unit with active intervention by the brake system receives input factors via the front end CAN (CAN G) from the center SAM control unit (N10/10), which primarily functions as a central data interface between the front end CAN and the interior CAN (CAN B) and receives the input factors from other control units. The resulting functions are described in the respective function descriptions (see appropriate block diagram or function schematic). The input factors are read in via the following connection:

Front end CAN

Front end CAN

The AWF controller unit with active intervention by the brake system receives input factors including the following:

Engine speed (except model 453.091/391/491)
Rpm of electric motor (only model 453.091/391/491)
Wheel speeds
Gear range (for code 429 (twinamic) and for model 453.091/391/491)
Status of the reverse gear (for code 410 (5-speed manual transmission))
Vehicle speed
Acceleration/yaw rate
Lateral acceleration
Steering wheel angle and steering angle rate of change
Accelerator pedal position and engine torque
Clutch pedal, status
Brake pedal position
Brakes status and status of Electronic Stability Program (ESP®) (brake pressure and ESP® already or switched off due to a fault)
Status of the turn signal

Evaluation of input factors

The input factors are evaluated by the integral microprocessor of the AWF controller unit with radar sensor and the corresponding assembly parts are actuated.

Transmission of initial parameters

Transmission of initial parameters takes place over the following connections:

Front end CAN

Front end CAN

The AWF controller unit with radar sensor transmits initial parameters via the front end CAN to the center SAM control unit including those which routes these for further processing on the interior CAN:

System status of AWF on the ME-SFI [ME] control unit (except model 453.091/391/491) or on the EDCU (N127) (only model 453.091/391/491)
The status of the object moving directly ahead or a stationary object at the ME-SFI [ME] control unit (except model 453.091/391/491) or at the EDCU (only model 453.091/391/491) and at the Electronic Stability Program control unit (N30/4)
Request for a static or collision-critical warning to output to the IC
Request to initiate the brake force amplification or an autonomous brake application to the Electronic Stability Program control unit

Structure

The following components are integrated in the AWF controller unit with radar sensor:

Radar sensor
Intelligent control electronics (control unit)

Properties of the radar sensor:

Detection range: 0 to 90 m (about 295 ft)
Carrier frequency: 76 to 77 GHz

Wiring diagram for distance warning function controller unit with radar sensor

PE30.30-P-2105-97BEB