GF30.30-P-3310LEA BAS Plus, Function

GF30.30-P-3310LEA BAS PLUS, Function
- with CODE (239) Autonomous intelligent cruise control Plus Light
- refinement package
- as of model year 2010







Accident-critical situation detected by the BAS PLUS (Brake Assist System PLUS)

BAS PLUS function requirements, general
^ Autonomous intelligent cruise control Plus Light coded in central gateway control unit (N93)
^ Long range radar soiling and function test completed
^ Circuit 61 ON (engine running)
^ Gear range "D" engaged
^ The vehicle is moving forwards
^ Accelerator not operated

BAS PLUS, general
The BAS PLUS function is an additional function of the Brake Assist System (BAS), which assists the driver during emergency braking by means of specific calculations of the brake force for a given situation.

The data from the radar is used to continuously calculate the potential risk of a collision. If the driver brakes heavy in a critical situation, the brake force is (if necessary) boosted so as to avoid a collision (within physical limits).

BAS PLUS function sequence
The function sequence is described in the following steps:
^ Braking torque computation function sequence
^ Activation function sequence
^ Accident-critical situation function sequence
^ Deactivation function sequence

Braking torque computation function sequence
Sensor data from the radars and input signals are evaluated by the radar sensors control unit (SGR) (N62/1) and the necessary braking torque is calculated to support the Brake Assist System.
The calculated braking torque is sent over the vehicle dynamics CAN (CAN H) to the ESP control unit (N47-5), which adjusts the brake pressure as required through the traction system hydraulic unit (A7/3).

The required braking torque is continuously recalculated by the radar sensors control unit on the basis of the current distance and the closing speed, and is relayed to the ESP control unit. A partial braking right up to emergency braking of the vehicle can occur depending on the situation.

Activation function sequence
The BAS PLUS is activated if a critical accident situation is recognized after braking forcefully.

Accident-critical situation function sequence
At current closing speed, the distance of the vehicle from a detected object (vehicle) is detected as critical for an imminent collision. Such objects can be objects in motion in front of the vehicle. Stationary targets are not recognized.

Deactivation function sequence
If the driver applies significant movement to the brake pedal again, at a certain threshold value, brake assistance is withdrawn until braking is by the driver alone (depends on brake pedal travel) and BAS PLUS is deactivated. The BAS PLUS function is also deactivated if the accelerator pedal is operated.
If the function requirements for the BAS PLUS are no longer fulfilled or a fault is detected, BAS PLUS is deactivated.

Function as well as failure of BAS PLUS is not indicated to the driver.