Track Guidance, Basic Function - GF54.71-P-9900A
MODEL ALL (CAR)
with CODE 22P (Lane tracking package)
MODEL ALL (CAR)
with CODE 23P (Driving Assistance package)
MODEL ALL (CAR)
with CODE 243 (Active lane keeping Assist)
MODEL ALL (CAR)
with CODE P20 (Driving Assistance package Plus)
Overview
This document contains the following information:
- General
- Function requirements
- Track guidance
General
The track guidance function evaluates the course of the road in front of the vehicle using the multifunction camera (lane recognition).
Lane recognition
The multifunction camera calculates the lane based on two lane algorithms. If comparison of these lane algorithms results in a match, the multifunction camera generates a safe lane. The multifunction camera uses this data to calculate the relative position of the vehicle in the lane.
If the track guidance function detects that the vehicle has left the lane, it warns the driver with noticeable steering wheel vibrations generated by the steering system. The system also evaluates the driving behavior of the driver and decides the point at which a warning is to be issued.
In addition, the track guidance function can guide the vehicle back into the lane by means of targeted intervention by the brake system. The track guidance function can be switched on and off manually.
Function requirements
- Engine running or drive train operational
- Multifunction camera soiling and function test completed successfully
- Radar sensor system soiling and function test completed successfully (vehicles with Driving Assistance Package)
- Vehicle moving forward
Track guidance
The driver can choose between two track guidance operating modes:
- Standard (Sensitivity increased, warnings issued earlier and more frequently)
- Adaptive (reduced sensitivity, warnings issued later and less often)
Track guidance operates at vehicle speeds ranging from 60 to 200 km/h (vehicles without Driving Assistance Package) and 60 to 210 km/h (vehicles with Driving Assistance Package).
The track guidance function evaluates the following function-relevant parameters:
- Information from the lane recognition system
- Information about parallel/oncoming traffic (vehicles with Driving Assistance Package)
- Driver activity
- Driver distracted
If the multifunction camera detects that the vehicle has crossed lane markings, the steering wheel vibrates to warn the driver that the vehicle has left the lane. If the driver does not react to this warning and the vehicle continues to leave the lane, the track guidance function steers the vehicle back into the lane. For this purpose, the track guidance function requests wheel-specific interventions by the brake system. However, brake application is only triggered when two stored lane algorithms deliver the same result.
Vehicles with Active Lane Keeping Assist:
The track guidance function compares the results of the lane algorithm of the multifunction camera (mono) with a reference algorithm.
Vehicles with Driving Assistance Package:
Two lane algorithms whose results are compared with each other are stored in the multifunction camera (stereo).
The track guidance function triggers course-correcting brake application if the vehicle crosses a continuous or broken line.
The following conditions must be fulfilled here:
- Lane width 2.6 to 4.7 m
- Curve radius > 500 m (inner radius), > 150 m (outer radius)
- Tire pressure of all wheels within the tolerance range (run-flat mode not active) (vehicles with tire pressure monitoring system)
- No trailer operation (vehicles with trailer hitch)
- Brake application by brake system enabled (no active control intervention by brake system)
If the system detects driver activity or that the driver is distracted, brake application is canceled.
Vehicles with Driving Assistance Package:
In the case of lane-correcting brake application, the track guidance function takes the oncoming/parallel traffic in the adjacent lane into consideration and guides the vehicle back onto a collision-free course.
| Function schematics | |||
| Track guidance, function schematic | Model 167 with code 22P (Lane tracking package) except code 23P (Driving Assistance package) except code 51B (EURO NCAP) except code P20 (Driving Assistance package Plus) Model 167 with code 243 (Active lane keeping Assist) except code 23P (Driving Assistance package) except code 51B (EURO NCAP) except code P20 (Driving Assistance package Plus) Model 177 with code 22P (Lane tracking package) except code 23P (Driving Assistance package) except code 51B (EURO NCAP) Model 177 with code 243 (Active lane keeping Assist) except code 23P (Driving Assistance package) except code 51B (EURO NCAP) | PE54.71-P-2501-97A | |
| Model 167 with code 22P (Lane tracking package) with code 51B (EURO NCAP) except code 23P (Driving Assistance package) except code P20 (Driving Assistance package Plus) Model 167 with code 243 (Active lane keeping Assist) with code 51B (EURO NCAP) except code 23P (Driving Assistance package) except code P20 (Driving Assistance package Plus) Model 177 with code 22P (Lane tracking package) with code 51B (EURO NCAP) except code 23P (Driving Assistance package) Model 177 with code 243 (Active lane keeping Assist) with code 51B (EURO NCAP) except code 23P (Driving Assistance package) | PE54.71-P-2501-97B | ||
| Model 167, 177 with code 23P (Driving Assistance package) Model 167 with code P20 (Driving Assistance package Plus) | PE54.71-P-2501-97C | ||
| Subsystems | |||
| Driver activity detection, basic function | GF54.30-P-1000A | ||
| Traffic area monitoring, basic function | GF54.71-P-1000A | ||
| Additional basic functions | |||
| Brakes, basic function | GF42.00-P-9900A | ||
| Control units | |||
| Intelligent driving control unit, basic function | Model all (CAR) with code 23P (Driving Assistance package) Model all (CAR) with code P20 (Driving Assistance package Plus) |
GF30.30-P-9890A | |
| Electronic Stability Program control unit, basic function | GF42.45-P-9890A | ||
| Electric power steering control unit, basic function | GF46.35-P-9890A | ||
| Multifunction camera, basic function | Model all (CAR) with code 22P (Lane tracking package) Model all (CAR) with code 23P (Driving Assistance package) Model all (CAR) with code 243 (Active lane keeping Assist) Model all (CAR) with code P20 (Driving Assistance package Plus) |
GF54.71-P-9890A | |
| Components | |||
| Intelligent driving radar sensor, basic function | Model all (CAR) with code 23P (Driving Assistance package) Model all (CAR) with code P20 (Driving Assistance package Plus) |
GF54.71-P-2005A |