MODEL 963, 964
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1 ASIC data bus (Application System Integrated Circuit)
A1 Instrument cluster (ICUC) control unit
A1 p1 Multifunction display
A2 Central gateway control unit (CGW)
CAN 2 Interior CAN CAN 3 Frame CAN
LIN 4 Left multifunction control lever LIN
S20 Left multifunction control lever S925 Lane Assistant OFF button Z1 Cab instrument panel CAN bus star
point
Z3 Frame CAN bus star point A9 Truck Control Center (TCC)
A43 Modular switch panel (MSF) control unit
A53 Driver assistance system (VRDU) control unit
A72 Lane Assistant camera B51 Driver speaker
B52 Front passenger speaker
General information
The Lane Keeping Assist is a visual system, which warns the driver acoustically in the event of an undesired deviation from the lane by means of speakers and visually via the indication in the multifunction display (A1 p1).
The Lane Assistant camera (A72) records the traffic lane 6 m to 35 m in front of the vehicle. The driver assistance system (VRDU) control unit (A53) evaluates the image of the Lane Assistant camera (A72) using bright road markings and investigates whether these correspond to the specified pattern of a symmetrical lane boundary.
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After the driver assistance system (VRDU) control unit (A53) has detected a symmetrical lane boundary, it monitors it constantly for symmetry and triggers an acoustic and visual warning as soon as there is a deviation from the lane. A deviation from the lane is present as soon as a wheel of the front axle drives over the edge of the recognized lane marking.
Requirements
f Lane boundary marking recognized f Vehicle speed greater than 60 km/h
f Lane Assistant camera (A72) parameterized correctly i The Lane Keeping Assist is unavailable, as long as an invalid camera height is parameterized in the driver assistance system (VRDU) control unit (A53). A fault entry is stored in the driver assistance system (VRDU) control unit (A53).
Output of a warning
The point in time for initiating an acoustic warning signal depends on the closing speed to the road marking and the width of the lane. In a narrow lane the warning signal is initiated later than in the case of a wide one, as unintentional, harmless lateral deviations occur more frequently in narrow lanes.
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The acoustic warning signal, a familiar noise emitted from rumble strips on construction sites, is output corresponding to the deviation via the driver speaker (B51) or front passenger speaker (B52).
For this purpose, the speakers are equipped with a second coil. The volume of the radio is reduced for better perception of the warning signal during the warning process. The visual warning output is indicated in the multifunction display (A1 p1).
Minimum warning time and warning break
The minimum warning time is 1.5 s and lasts approx. 4 s.
A new warning can only be output after a warning break of 3 s. If there is another deviation from the lane during the warning break, the warning output is suspended for the duration of this deviation from the lane.
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Warning suppression
In certain situations, it is not desirable that the Lane Keeping Assist issues a warning. There are prerequisites here for completely suppressing the warning output (acoustically and visually). Under certain prerequisites, a continued visual warning output is permitted. The warning can be suppressed both before and during a warning output.
The activated system suppresses/interrupts the acoustic and visual warning output in the following cases:
f vehicle speeds below 60 km/h
f driving over the lane marking with more than half of the vehicle's width
f correcting steering intervention by the driver (steering back into the lane while a warning is output)
f missing or poorly visible road markings
f contradictory markings on the road (traffic zone) f width of lane below 3 m
f radius of curve less than 125 m
f a set turn signal indicator
f switching the Lane Assistant button off (S925)
The activated system suppresses the acoustic warning output (visual warning output continues to be output) in the following cases:
f Kickdown
f brake application with brake pedal position of more than 30%
f control intervention function of the Electronic Stability Program (ESP“)
f distance warning by the Active Brake Assist 2 or the Proximity Control Assist
Activation/deactivation of the Lane Keeping Assist
The function of the Lane Keeping Assist is activated when the ignition is switched on and can be deactivated via the Lane Assistant off (S925) button. When the Lane Keeping Assist is deactivated, the indicator lamp in the Lane Assistant off (S925) button is on.
The road markings in the multifunction display (A1 p1) are shown in gray.
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Warning output of the Lane Keeping Assist
The warning is output in the multifunction display (A1 p1). The deviation from the lane is indicated by a red road marking.
Indication of deviation from the lane on the left, when the lane marking is interrupted
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Indication of deviation from the lane on the right, when the lane marking is interrupted
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Indication of deviation from the lane on the right, when the lane marking is continuous
Instrument cluster control unit (ICUC), component description
A1
Page 331
Central gateway control unit (CGW), component description
A2
Page 333
Modular switch panel control unit (MSF), component description
A43
Page 370
Driver assistance system (VRDU) control unit, component description
A53
Page 378
Lane Assistant camera (SPA), component description