Distance Control, Basic Function - GF30.30-P-9903A
Model all (CAR)
Overview
This document contains information on:
- General
- Function requirements
- Function
- Starting off
- Maintaining distance
- Convoy driving
- Pulling out/pulling in
- Passing over roundabouts, T intersections and freeway exit lane
- Approaching red traffic lights
- Rebuild
- Stop vehicle
- Active Stop-and-Go Assist
General
Distance control regulates the distance from a preceding vehicle as specified by the driver. The system uses the information of the radar sensor system and camera for this purpose. The distance control can react to swinging in vehicles, vehicles in front and stationary vehicles.
On approaching a preceding vehicle, the distance control system reduces the speed and brakes the vehicle, to a standstill if necessary.
The driver is visually and acoustically warned if the system detects that a stronger brake application is required (e.g. vehicles swinging in, stationary obstacle). Both require the driver to proceed with increased caution and to possibly also brake himself. If the driver reacts to the warning and brakes, he/she is supported in this by the Active Brake Assist. If a collision is likely, Active Brake Assist intervenes to prevent an accident if possible. As soon as the traffic situation permits again, the vehicle accelerates up to the specified speed set in the speed control system.
If the driver actuates the accelerator pedal, distance control is switched to passive until the driver releases the accelerator pedal again.
If the fast lane is free and a lane change is indicated by flashing, the vehicle accelerates rapidly to the speed control system's specified speed.
The distance control system's driving style is influenced by the selected drive program. In the "Sport" drive program, for example, acceleration is more dynamic and sharp. In the "Comfort" drive program, distance control operates with greater emphasis on comfort. In the "Max Range" drive program, the distance control works in a fuel consumption optimized manner with max. range and recuperation (vehicles with electric motor).
Distance control is operated with the buttons on the steering wheel.
The traffic situation is still evaluated even when distance control is switched off. As described above, warnings are then output or braking takes place in dangerous situations.
Function requirements
- Driver's door closed and driver present
- Passenger door CLOSED
- Engine running or drivetrain operational
- Parking brake released
- Gear range "D" engaged (vehicle not in backward movement)
- Distance control system switched on
- Vehicle speed 0 to 200 km/h; for vehicles with Driving Assistance Package, up to 210 km/h
- Speed setting 20 up to160 km/h; on vehicles with Driving Assistance Package, up to 210 km/h
Function
Distance control is activated when the radar sensor detects a preceding vehicle and the driver sets a specified distance from it.
Distance control evaluates the driving and traffic situation on the basis of the following parameters:
- Vehicle speed/acceleration
- Location information (position finding) (vehicles with Driving Assistance Package, country-dependent)
- Information for traffic assessment
- Accelerator pedal position
- Engine drive torque
- Brake pedal position
- Brake torque
If a vehicle is located in the radar sensor's detection range, one's own vehicle follows it. Otherwise, the system activates speed control.
In stop-and-go traffic, the vehicle automatically drives off again within 3 s or 30 s of stopping and follows the vehicle in front. When the vehicle is stationary for longer, distance control switches off.
On vehicles with Active Parking Assist, the traffic area ahead of the vehicle is additionally monitored by the distance sensors.
On roads with separate lanes (e.g. freeway), the vehicle automatically drives off again within 30 s of stopping and follows the vehicle in front.
"Automatic start off" must be activated in the multimedia system.
Maintaining distance
During the drive, distance control is activated if the driver has activated
Active Distance Assist DISTRONIC and a vehicle is located in the detection range of the radar sensor. This vehicle is then followed at the set distance.
The driver can continue to accelerate the vehicle himself. Distance control is interrupted as long as he actuates the accelerator pedal. A text message indicates this status.
If the distance control system requests higher acceleration than that specified by the driver, the driver's specification is overridden. Distance control switches to speed control under the following conditions:
- The preceding vehicle leaves the radar sensor detection range.
- The preceding vehicle accelerates to over 200 km/h or 210 km/h (vehicles with Driving Assistance Package).
Convoy driving (vehicles with Driving Assistance Package, depending on country)
If a convoy forms as a result of the traffic situation on the left-hand lane, it may be overtaken on the right under the following prerequisites:
- Convoy speed below 80 km/h
- Overtaking speed less than 20 km/h relative to the convoy
- Maximum overtaking speed 85 km/h
- Well built, multi-lane road with a maximum permissible speed of over 80 km/h
The preceding vehicle is followed at the set distance.
Pulling out/pulling in
If the preceding vehicle pulls out during distance control and is ahead of a further vehicle, the distance is regulated to the new vehicle.
If a vehicle pulls into the safe distance from the preceding vehicle, the distance is regulated to this new vehicle. If a vehicle pulls onto the lane on which the own vehicle is driving during speed control, the distance is regulated to this vehicle.
If necessary, the distance control system brakes the own vehicle. This deceleration is limited to a maximum of 50 % of the possible braking power. Distance control is deactivated in this connection and can then be reactivated (up to Driving Assistance Package generation 5). This process is signaled to the driver via the output of warnings (up to Driving Assistance Package generation 5).
Driving through traffic circles, T-intersections, and freeway exits
(vehicles with Driving Assistance Package, depending on country)
Before entering traffic circles, T-intersections, and freeway exits, distance control brakes the vehicle.
If the preceding vehicle leaves the radar sensor detection range in one of the listed situations, the current speed is maintained:
- 10s before a traffic circle or a T-intersection
- 12s before a freeway exit
- 4s after a freeway exit
If no preceding vehicle is then detected, the vehicle accelerates or decelerates to the set speed.
As road courses are subject to changes, regularly updating the digital map material is necessary.
Approaching red traffic lights
If an intersection is detected at which all detected traffic lights are red, a red light warning appears on the driver's display and the distance control brakes the vehicle. "Red light warning" and "Breaking at red traffic lights" must each be activated in the multimedia system.
- Acceleration/yaw torque
- Transmission mode
- Steering movements
- The driver request "Overtake":
- ESP® status
- Engine hood status
Starting off
Distance control is activated by pressing the accelerator pedal or by selecting a set speed.
Overtaking (vehicles with Driving Assistance Package with deactivated lane change assist)
When overtaking at a speed over 70 km/h, distance control accelerates the vehicle automatically. The driver must introduce the overtaking process by flashing. System-related, automatic brake application is suspended (evasion). If required, the vehicle is accelerated more extensively.
The overtaking maneuver is broken off in the following situations:
- Risk of collision with the vehicle in front
- Risk of collision with a vehicle driving ahead at the side
Stop vehicle
When distance control is active, the vehicle follows the preceding vehicle to a standstill. The vehicle is decelerated. The service brake secures the stationary vehicle against rolling away.
After a short time, the electric parking brake is activated (standstill control securing strategy). Securing the vehicle does not replace securing the vehicle when parking.
Active Stop-and-Go Assist (vehicles with Driving Assistance Package, as of market launch of model 167)
In stop-and-go traffic on freeways, the distance control also takes over the task of lane guidance up to approx. 60 km/h.
The vehicle automatically drives off again after a stop within 1 min and orients itself based on the vehicle in front and the lane markings.
For a display with green steering wheel, the active Stop-and-Go Assist is switched on.
| Function schematics | |||
|---|---|---|---|
| Regulate distance, function schematic | Model 118, 167, 177, 243, 247, 293 with code 239 (Adaptive cruise control Pro (DISTRONIC PRO)) Model 213, 238, 257, 290 as of model year 2021 with code 239 (Adaptive cruise control Pro (DISTRONIC PRO)) | PE30.30-P-2502-97A | |
| Model 118, 167, 177, 243, 247, 293 with code 233 (Adaptive cruise control Plus (DISTRONIC PLUS)) Model 213, 238, 257, 290 as of model year 2021 with code 233 (Adaptive cruise control Plus (DISTRONIC PLUS)) | PE30.30-P-2502-97B | ||
| Model 223, 297 | PE30.30-P-2502-97C | ||
| Model 206, 232, 254, 295, 296 | PE30.30-P-2502-97D | ||
| Detailed information | |||
| Functional limitations of distance control, detailed information | GF30.30-P-0024-01A | ||
| Additional basic functions | |||
| Increase speed, basic function | GF30.30-P-1000A | ||
| Reduce speed, basic function | GF30.30-P-1001A | ||
| Collision warning system, basic function | GF54.70-P-9900A | ||
| Traffic area monitoring, basic function | GF54.71-P-1000A | ||
| Track guidance, basic function | GF54.71-P-9900A | ||
| Active Steering Assist, basic function | GF54.71-P-9903A | ||
| Direction of travel selection, basic function | MODEL 243, 293, 295, 296, 297 | GF08.00-P-1002A | |
| Gearshift system, basic function | All models with transmission 725.0/1 | GF27.60-P-1002B | |
| Brakes, basic function | GF42.00-P-9900A | ||
| Intelligent driving control unit, basic function | Model all (CAR) with code 233 (Adaptive cruise control Plus (DISTRONIC PLUS)) | GF30.30-P-9890A | |
| Distance control controller unit, basic function | Model all (CAR) with code 239 (Adaptive cruise control Pro (DISTRONIC PRO)) | GF30.30-P-9891A | |
| Intelligent driving radar sensor, basic function | GF54.71-P-2005A |