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

GF30.30-P-3310LE BAS PLUS, Function
- with CODE (233) Distronic Plus
- as of model year 09







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

BAS PLUS function requirements, general
^ "ADTR_AVL" (DISTRONIC PLUS) coded in central gateway control unit (N93)
^ Radar sensor system not disabled
^ Long range radar soiling and function test completed
^ Circuit 61 ON (engine running)
^ Parking brake not applied
^ Gear range "D" engaged

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 long and short range 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:
^ Function sequence for braking torque computation
^ Function sequence for activation
^ Function sequence for an accident-critical situation
^ Function sequence for deactivation

Function sequence for braking torque computation
The sensor data from the long range and short range radars and the input signals are evaluated by the radar sensors control unit (SGR) (N62/1) and the necessary braking torque to support the Brake Assist System is calculated.

The calculated braking torque is transmitted via the chassis CAN (CAN E) to the ESP control unit (N47-5) or regenerative braking system control unit (N30/6) (for hybrid) which controls the brake pressure appropriately via the traction system hydraulic unit (A7/3).

The required braking torque is newly calculated in the process by the radar sensors control unit based on the current clearances and the closing speed and transmitted to the ESP control unit or the regenerative braking system control unit (for hybrid). A partial braking right up to emergency braking of the vehicle can occur depending on the situation.

Function sequence for activation
BAS PLUS is activated when:
- A potential accident situation is detected
- Heavy driver-induced braking is detected from the brake pedal travel and the actuation speed of the brake pedal
- Accelerator not operated
- The vehicle is moving forwards

Accident-critical situation function sequence
At the current closing speed, the distance of the vehicle from a detected object (vehicle) is detected as critical for an imminent collision. The objects in question are all objects in front of the vehicle that have been detected at least once as moving at speeds (of the host vehicle) up to 70 km/h as well as stationary objects.

Function sequence for deactivation
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.