gf5471p9900a

Track guidance, basic function

Type gf · topic 54.71 · version 0105 · 2020-06-15

Applies to: Model all (CAR) with code 22P (Lane tracking package) Model all (CAR) with code 23P (Drive package) Model all (CAR) with code 243 (Active Lane Keeping Assist (camera)) Model all (CAR) with code P20 (Driving assistant package Plus)

Where it sits

Function group 2 Chassis › 54 Electrical system, equipment and instruments › 54.71 Camera and radar-assisted assistance systems — Series 900 (models 9**) · Series 902 (models 9**) · Series 904 (models 918, 919, 924, 925, 938, 943, 957) · Series 906 (models 917, 918, 924, 953)

EinPAS 26 Active safety system › 26.28 Lane Keeping Assist › 26.28.1 Basic information — Series 900 (models 9**) · Series 902 (models 9**) · Series 904 (models 918, 919, 924, 925, 938, 943, 957) · Series 906 (models 917, 918, 924, 953)

Also applies to engines/gearboxes: 139 ***, 254 ***, 256 ***, 272 ***, 276 ***, 282 ***, 457 9**, 541 9**, 542 9**, 608 ***, 700 4**, 700 420, 700 421, 700 422, 700 423, 715 3**, 715 5**, 722 6**, 722 9**, 724 ***, 724 0**, 724 033, 724 044, 724 045, 724 1**, 724 103, 724 114, 724 115, 724 120, 725 ***, 725 0**, 725 035, 725 037, 725 038, 725 085, 725 1**, 739 390, 739 391, 739 395, 739 396, 739 397, 739 398, 739 399, 740 698, 743 3**, 743 4**, 743 498, 746 971, 924 9**, 924 910, 925 9**, 926 9**

GF54.71-P-9900A

Track guidance, basic function

04.06.2020

Model

all (CAR)

with code 22P (Lane tracking package)

Model

all (CAR)

with code 23P (Drive package)

Model

all (CAR)

with code 243 (Active Lane Keeping Assist (camera))

Model

all (CAR)

with code P20 (Driving assistant 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).

Track guidance, basic function

Lane recognition

P54.71-2082-81

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.

Track guidance, basic function

1

Normal driving

2

Haptic warning

3

Driver reaction or brake application

P54.71-2747-75

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 2 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 in a vehicle speed range from 60 to 200 km/h (vehicles without Driving Assistance Package) or 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 2 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:

The multifunction camera (stereo) contains 2 lane algorithms, the results of which are compared with each other.

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   to4.7 m

Curve radius > 500 m (inside radius), > 150 m (outside 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 118, 167, 177, 213, 238, 243, 247, 257, 290, 293 except code 51B (Rating, EURO NCAP countries set) with code 22P (Lane Tracking Package) or with code 243 (Active Lane Keeping Assist (Camera))

PE54.71-P-2501-97A

Model 118, 167, 177, 213, 238, 243, 247, 257, 290, 293 with code 51B (Rating, EURO NCAP countries set) and with code 22P (Lane Tracking Package) or with code 243 (Active Lane Keeping Assist (Camera))

PE54.71-P-2501-97B

Model 118, 167, 177, 213, 238, 243, 247, 257, 290, 293 with code 23P (Drive package)Model 167, 213, 257, 290 with code P20 (Driving assistant 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 (Drive package)
Model all (CAR)
with code P20 (Driving assistant 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 (Drive package)
Model all (CAR)
with code 243 (Active Lane Keeping Assist (camera))
Model all (CAR)
with code P20 (Driving assistant package Plus)

GF54.71-P-9890A

Components

Intelligent driving radar sensor, basic function

Model all (CAR)
with code 23P (Drive package)
Model all (CAR)
with code P20 (Driving assistant package Plus)

GF54.71-P-2005A

Referenced documents