Function Of Adaptive Highbeam Assist - GF82.10-S-3091TRF
Model 447
with code LG2 (LED Intelligent Light System)
with code XM0 (Facelift)
except code XM7 (MOPF II)
Shown on model 447.6/7
Illustration shows Model 447.8
Function requirements, general
- No overvoltage or undervoltage
- Transport mode not active
- Function activated in instrument cluster (IC) control unit (A1/1).
- "Engine running" signal.
- Low beam "ON"
- Combination switch (S4) in "High beams" position
The CDI control unit or the ME control unit sends the "Engine running" and "Drivetrain operational" signals to the signal acquisition and actuation module (SAM) control unit (N10/1).
The "Adaptive Highbeam Assist" function is manually selected via the control level in the instrument cluster (IC) control unit. This sends the corresponding status to the signal acquisition and actuation module (SAM) control unit.
The steering column tube module (MRM) control unit (N80) reads in the position of the combination switch directly and sends the status to the signal acquisition and actuation module (SAM) control unit.
The signal acquisition and actuation module (SAM) control unit sends the release status to the multifunction camera (MFK) control unit (B84/8).
The multifunction camera (MFK) control unit is the master control unit for the Adaptive Highbeam Assist.
Function sequence for Adaptive Highbeam Assist
The traffic and environment situation in front of the vehicle is detected and evaluated by the multifunction camera (MFK) control unit. Actuating the actuator motors installed in the left front LED lamp unit (E1/1) and the right front LED lamp unit (E2/1) provides for optimum illumination of the road surface without dazzling other road users.
The multifunction camera (MFK) control unit uses the brightness, shape, structure, color and motion of detected objects to differentiate between preceding or oncoming road users, street lights, signs or other parts of the traffic-related environment.
The picture recognition module integrated into the multifunction camera (MFK) control unit evaluates the distances from other objects, e.g. other road users. It assesses the outside brightness level of the vehicle surroundings and detects extreme weather conditions (e.g. dense fog, heavy snowfall) or if the vehicle is driving through a tunnel.
The multifunction camera (MFK) control unit evaluates the following information, among other things, to implement the function:
- Steering wheel angle
- Vehicle speed
- Yaw behavior
The steering column tube module (MRM) control unit calculates the steering wheel angle and sends the signal to the multifunction camera (MFK) control unit.
The Electronic Stability Program (ESP) control unit (N30/4) sends the vehicle speed to the multifunction camera (MFK) control unit.
The Supplemental Restraint System (SRS) control unit (N2/18) sends the information on the yaw behavior of the vehicle to the multifunction camera (MFK) control unit.
A differentiation is made between the following Adaptive High Beam Assist functional states:
- Optical headlamp range control (from 25 km/h)
The headlamp range of the low beam is automatically adapted to the distance to other road users.
- Automatic high beam (from 30 km/h)
The automatic high beams are activated if no other road user is detected.
- High beam assist PLUS (with code LG8 (High beam assist PLUS)) (from 45 km/h)
High beam assist PLUS places road users in the low beam section of the light cone, thereby omitting them from the high beam.
High beam assist PLUS is not activated if a vehicle is detected in front that is less than a defined minimum distance away at the time of activation. The switch-off threshold lies at approx. 30 km/h if high beam assist PLUS is active and if deceleration takes place from a speed of > 45 km/h.
Light cone of vehicle
Optical headlamp range control (v > 25 km/h)
The multifunction camera (MFK) control unit sends the "Optical headlamp range control" request to the left headlamp control unit (E11n9) and the right headlamp control unit (E21n9), depending on the distance of the vehicle to other road users and the geometry of the road (height differences, angle).
The left headlamp control unit actuates the left active curve lights actuator motor (E1/1m2) and the left light distribution actuator motor (E1/1m3) directly.
The right headlamp control unit actuates the right active curve lights actuator motor (E2/1m2) and the right light distribution actuator motor (E2/1m3) directly.
The headlamp units of the left front LED lamp unit and the right front LED lamp unit are raised accordingly. The road surface is better illuminated without causing a dazzling effect for other road users. The headlamp range varies between 65 m (standard lighting) and 300 m.
The current position of the left light distribution actuator motor is reported to the left headlamp control unit and the current position of the right light distribution actuator motor is reported to the right headlamp control unit.
For this purpose, the left headlamp control unit directly reads in the signal from the left light distribution position sensor (E1/1b2) and the right headlamp control unit directly reads in the signal from the right light distribution position sensor (E2/1b2).
Automatic high beam (from 30 km/h)
If no other road users are detected, the multifunction camera (MFK) control unit activates the "automatic high beams" function.
The multifunction camera (MFK) control unit sends the "High beam on" request to the signal acquisition and actuation module (SAM) control unit.
The activated function is visually indicated to the driver in the instrument cluster (IC [KI]) control unit.
The signal acquisition and actuation module (SAM) control unit sends the "High beam ON" request to the instrument cluster (IC) control unit, which then actuates the high beam indicator lamp (A1/1e3).
The left headlamp control unit actuates the left light distribution actuator motor directly and sends the "High beam ON" request via the left headlamp LIN (LIN G1) to the left front LED exterior lighting actuation module (E11n7). This actuates the left high beam (E1/1e1).
The right headlamp control unit actuates the right light distribution actuator motor directly and sends the "High beam ON" request via the right headlamp LIN (LIN G2) to the right front LED exterior lighting actuation module (E21n7). This actuates the right high beam (E2/1e1).
On roads with street lamps positioned regularly, the automatic high beams are deactivated.
High beam assist PLUS (with code LG8 (High beam assist PLUS)) (from 45 km/h)
If other road users are detected while the automatic high beam function is active, the multifunction camera activates the high beam assist PLUS function.
Schematic diagram of light distribution of high beam assist PLUS
The signal acquisition and actuation module (SAM) control unit transmits the "High beam ON" status to the instrument cluster (IC) control unit, which then actuates the high beam indicator lamp.
The multifunction camera (MFK) control unit sends the "Light output setting" and "Rotation angle setting" request to the left headlamp control unit and to the right headlamp control unit depending on the distance of the vehicle to other road users and the geometry of the road (differences in height, angle).
The left headlamp control unit actuates the left light distribution actuator motor directly and sends the "Increase light output" request over the left headlamp LIN to the left front actuation module, LED exterior lighting. This increases the light output of the left low beam (long range) (E1/1e16).
The right headlamp control unit actuates the right light distribution actuator motor directly and sends the "Increase light output" request over the right headlamp LIN to the right front actuation module, LED exterior lighting. This increases the light output of the right low beam (long range) (E2/1e16).
Adaptive Highbeam Assist limits
In tight curves, the multifunction camera may not recognize oncoming vehicles or only do so very late due to the recording angle of 35°.
On streets with structural separation (e.g. guardrails on freeways), the headlamps of oncoming vehicles are often concealed. These vehicles cannot be recognized by the multifunction camera.
Due to the geometry, the structural separation and the location of the headlamps on cars, the drivers of the oncoming cars are not dazzled. Truck drivers, however, may be dazzled due to the high seat position. The clearance lamps on trucks are not sufficient for recognition.
When driving over hills, oncoming vehicles are only recognized late on, which is why the automatic high beams are also switched off later. In this situation, however, the driver of the oncoming vehicle is also dazzled by the low beams.
The maximum range of the multifunction camera is 500 to 800 m, depending on the light conditions.
A reduced range of vision (snow, fog, rain) can result in a reduced recognition performance.
When illuminating large, highly reflective surfaces (e.g. traffic signs), the light output is reduced below a specific distance in order to minimize the reflective glare.
In the event of any restricted multifunction camera range of vision (fogging or icing), the Adaptive Highbeam Assist function is deactivated.
For bright lights that appear suddenly (e.g. street lamps, traffic lights), the automatic high beam is deactivated.
Some reflectors cannot be clearly differentiated from road users. The automatic high beams are deactivated because of the existing danger of dazzling other road users.
| Overview of exterior lights system components | GF82.10-S-9998TRF |