Function Of Adaptive Highbeam Assist - GF82.10-P-3091RF
Model 205, 253 with code 640 (High-performance LED)
Model 205, 253 with code 641 (Dynamic LED headlamps, left-hand traffic)
Model 205, 253 with code 642 (Dynamic LED headlamps, right-hand traffic)
Function requirements, general
- No overvoltage or undervoltage
- Transport mode not active
- "Engine running" or "drive train operational" signal on
- Exterior lights switch (S1) in position "AUTO"
Low beams actuation is active during high beams actuation.
- Combination switch (S4) in "High beams" position
The CDI control unit (N3/9) (diesel engine) or the ME-SFI control unit (N3/10) (gasoline engine) sends the "engine running" or "drive train operational" signal via the drive train CAN (CAN C1), powertrain control unit (N127), chassis FlexRay (Flex E), electronic ignition lock control unit (N73) and interior CAN (CAN B) to the front SAM control unit (N10/6).
The steering column tube module control unit (N80) reads in the switch position of the combination switch directly and sends it to the front SAM control unit via the chassis FlexRay, electronic ignition lock control unit and interior CAN.
The front SAM control unit reads in the status of the exterior lights switch directly.
As the master control unit for the exterior lights, the front SAM control unit reads in the function requirements, evaluates them and issues the release for the Adaptive Highbeam Assist function.
Vehicles except code 23P (Driving Assistance Package) :
The front SAM control unit transmits the release via the interior CAN, the electronic ignition lock control unit and the periphery CAN (CAN PER) to the mono multifunction camera (A40/11).
Vehicles with code 23P (Driving Assistance Package):
The front SAM control unit transmits the enable via the interior CAN, the electronic ignition lock control unit and the chassis FlexRay to the stereo multifunction camera (A40/13).
The multifunction camera is the master control unit for the Adaptive High Beam Assist.
Function sequence for Adaptive Highbeam Assist
The multifunction camera detects the traffic and environment situation in front of the vehicle and evaluates this. Optimal illumination of the roadway is guaranteed by modifying the light distribution without dazzling other road users. The multifunction camera uses the brightness, shape, structure, color, where applicable, and motion of detected objects to differentiate between preceding or oncoming road users, street lighting, signs or other parts of the environment. The picture recognition module integrated into the multifunction camera judges the distance, e.g. to other road users, evaluates the outside brightness level of the vehicle environment and recognizes extreme weather conditions (e.g. thick fog, heavy snowfall) or tunnels.
The multifunction camera evaluates the following information to implement the function, among other things:
- Steering angle
- Vehicle speed
- Yaw behavior
The steering column tube module control unit directly reads in the data from the steering wheel angle sensor (N49) and calculates the steering angle.
Vehicles except code 23P (Driving Assistance Package):
The steering column tube module control unit transmits information about the steering angle via the chassis FlexRay, the electronic ignition switch control unit and the periphery CAN to the mono multifunction camera.
Vehicles with code 23P (Driving Assistance Package):
The steering column tube module control unit transmits information about the steering angle via the chassis FlexRay to the stereo multifunction camera.
The vehicle speed is calculated on the basis of the wheel speeds.
Vehicles except code 23P (Driving Assistance Package) :
The Electronic Stability Program control unit (N30/4) transmits information about the wheel speeds via the chassis FlexRay, the electronic ignition switch control unit and the periphery CAN to the mono multifunction camera.
Vehicles with code 23P (Driving Assistance Package):
The information regarding wheel speed is transmitted by the Electronic Stability Program control unit via the chassis FlexRay to the stereo multifunction camera.
The yaw behavior of the vehicle is recorded by the acceleration sensor integrated in the Supplemental Restraint System control unit (N2/10).
Vehicles except code 23P (Driving Assistance Package) :
The Supplemental Restraint System control unit transmits information about the yaw behavior of the vehicle via the dynamics CAN (CAN H), the Electronic Stability Program control unit, the chassis FlexRay, the electronic ignition switch control unit and the periphery CAN to the mono multifunction camera.
Vehicles with code 23P (Driving Assistance Package):
The Supplemental Restraint System control unit transmits information about the yaw behavior of the vehicle via the dynamics CAN, the Electronic Stability Program control unit and the chassis FlexRay to the stereo multifunction camera.
A differentiation is made between the following Adaptive High Beam Assist functional states:
- Optical headlamp range adjustment (as of approx. v = 25 km/h)
The headlamp range of the low beam is automatically adapted to the distance to other road users.
- Automatic high beams (as of approx. v = 30 km/h)
The high beams are activated if no other road user is detected.
- Partial high beam (as of approx. v = 45 km/h) (except model 205 up to 01.03.2018, model 253, with code 640 (High Performance LED))
The partial high beam places road users in the low beam section of the light cone thereby omitting them from the high beam.
The partial high beams are 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 is approx. v = 30 km/h, if the partial high beams have been activated and deceleration from a speed of v > 45 km/h occurs.
Optical headlamp range adjustment (as of approx. v = 25 km/h)
The multifunction camera evaluates the traffic and environment situation of the vehicle and activates the optical headlamp range adjustment function depending on the distance of the vehicle from other road users and the road geometry (height differences, angle).
Vehicles except code 23P (Driving Assistance Package):
The mono multifunction camera transmits information about the traffic and environment situation of the vehicle and the "Optical headlamp range adjustment" request via the periphery CAN to the left headlamp control unit (E1n9).
Vehicles with code 23P (Driving Assistance Package):
The stereo multifunction camera transmits information about the traffic and environment situation of the vehicle and the "Optical headlamp range adjustment" request via the chassis FlexRay, the electronic ignition lock control unit and the periphery CAN to the left headlamp control unit.
Model 205 as of 02.03.2018:
The left headlamp control unit synchronizes the right headlamp control unit (E2n9) via the periphery CAN and actuates the left headlamp range adjustment actuator motor (E1m1) directly.
The right headlamp control unit actuates the right headlamp range adjustment actuator motor (E2m1) directly.
The low beam light cones are moved upwards, thereby providing better road illumination without dazzling other road users. The light cone of the headlamps varies between s = 65 m (standard lighting) and s = 300 m.
Model 205 up to 01 03 2018, model 253:
The left headlamp control unit actuates the left headlamp range control actuator motor and the left light distribution actuator motor (E1m3) directly.
The right headlamp control unit actuates the right headlamp range control actuator motor and the right light distribution actuator motor (E2m3) directly.
The current position of the left light distribution actuator motor is detected by the left light distribution position sensor (E1b2) and the position of the right light distribution actuator motor is detected by the right light distribution position sensor (E2b2). The signals of the light distribution position sensors are evaluated by the respective headlamp control unit.
The low beam light cones are moved upwards, thereby providing better road illumination without dazzling other road users. The light cone of the headlamps varies between s = 65 m (standard lighting) and s = 300 m.
Automatic high beams (as of approx. v = 30 km/h)
If no other road users are detected as the speed increases, the multifunction camera activates the automatic high beams function.
Model 205 as of 02 03 2018
Vehicles except code 23P (Driving Assistance Package):
The mono multifunction camera transmits the "High beams ON" request via the periphery CAN to the left headlamp control unit.
Vehicle with CODE 23P (Driving Assistance package):
The stereo multifunction camera transmits the "High beams ON" request via the chassis FlexRay, the electronic ignition lock control unit and the periphery CAN to the left headlamp control unit.
The activated function is visually indicated to the driver. To do so, the front SAM control unit sends the "high beam ON" request over the interior CAN, electronic ignition lock control unit and the user interface CAN (CAN HMI) to the instrument cluster (A1), which then actuates the high beam control message.
The left headlamp control unit evaluates all of the relevant information and transmits the "High beams light distribution" request via the peripherals CAN to the left front lamp unit LED matrix control unit (E1n11) and the right front lamp unit LED matrix control unit (E2n11). The left front lamp unit LED matrix control unit then actuates the left front adaptive high beam (E1e24) accordingly. The right front lamp unit LED matrix control unit actuates the right front adaptive high beam (E2e24) accordingly.
On roads with street lamps positioned regularly, the automatic high beams are deactivated.
Model 205 up to 01 03 2018 model 253
Vehicles except code 23P (Driving Assistance Package):
The mono multifunction camera sends the "High beams ON" request over the periphery CAN to the headlamp control units.
Vehicles with code 23P (Driving Assistance Package):
The stereo multifunction camera sends the "High beams ON" request over the chassis FlexRay, electronic ignition switch control unit and the periphery CAN to the headlamp control units.
The activated function is visually indicated to the driver. For this purpose, the front SAM control unit transmits the status "High beams ON" via the interior CAN, the electronic ignition lock control unit and the user interface CAN to the instrument cluster, which then actuates the high beams indicator lamp (A1e3).
The left headlamp control unit actuates the left light distribution actuator motor directly and on model 205 also the left high beam (E1e1) via the left headlamp LIN (LIN G1) and the left front actuation module, LED exterior lighting (E1n7).
The right headlamp control unit actuates the right light distribution actuator motor directly and on model 205 also the right high beam (E2e1) via the right headlamp LIN (LIN G2) and the right front actuation module, LED exterior lighting (E2n7).
On roads with street lamps positioned regularly, the automatic high beams are deactivated.
Partial high beam (as of approx. v = 45 km/h) (except model 205 up to 01.03.2018, model 253, with code 640 (High Performance LED))
If other road users are detected while the automatic high beams function is active, the multifunction camera activates the partial high beam function.
Schematic diagram of partial high beam light distribution
Model 205 as of 02.03.2018
The activated function is visually indicated to the driver. To do so, the front SAM control unit sends the "high beam ON" status over the interior CAN, electronic ignition lock control unit and the user interface CAN to the instrument cluster, which then actuates the high beam control message.
Vehicles except code 23P (Driving Assistance Package) :
The mono multifunction camera transmits information about the detected object and the "Light output adjustment" and "Rotation angle adjustment" requests via the periphery CAN to the left headlamp control unit.
Vehicles with code 23P (Driving Assistance Package):
The stereo multifunction camera transmits information about the detected object and the "Light output adjustment" and "Rotation angle adjustment" requests via the chassis FlexRay, the electronic ignition lock control unit and the periphery CAN to the left headlamp control unit.
The left headlamp control unit evaluates all of the relevant information and transmits the "Increase light output" request and the relevant object data via the peripherals CAN to the front lamp unit LED matrix control units. The front lamp unit LED matrix control units then increase the light output of the adaptive high beams and modify the light distribution so that the preceding or oncoming objects are blocked out of the high beam light cone and therefore not dazzled.
Model 205 up to 01.03.2018, model 253
The activated function is visually indicated to the driver. For this purpose, the front SAM control unit transmits the status "High beams ON" via the interior CAN, the electronic ignition switch control unit and the user interface CAN to the instrument cluster, which then actuates the high beams indicator lamp.
Vehicles except code 23P (Driving Assistance Package):
Depending on the distance between the vehicle and other road users and the road geometry (height difference, angle), the mono multifunction camera transmits the "Light output setting" and the "Rotation angle setting" request via the periphery CAN to the headlamp control units.
Vehicles with code 23P (Driving Assistance Package):
Depending on the vehicle's distance to other road users and the road geometry (height difference, angle), the stereo multifunction camera sends the "Light output setting" and the "Rotation angle setting" request over the chassis FlexRay, electronic ignition switch control unit and the periphery CAN to the headlamp control units.
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. The left front actuation module, LED exterior lighting increases the light output of the left high beam (model 205) or the left low beam (long range) (E1e16) (model 253).
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. The right front actuation module, LED exterior lighting increases the light output of the right high beam (model 205) or the right low beam (long range) (E2e16) (model 253).
Adaptive High Beam Assist limits:
In tight curves, the multifunction camera may not recognize oncoming vehicles or only do so very late due to the recording angle (∠ = 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 of 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 not recognized until late whereupon the 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 in poor light is approx. s = 500 m, and in good light it is approx. s = 800 m. In the event of reduced visibility (e. g. due to snow, fog, rain), detection performance may also be affected.
When illuminating large, highly reflective areas (e.g. traffic signs) the power of the headlamps is reduced at less than a specific distance away in order to minimize any self-dazzling effect.
In the event of restricted multifunction camera visibility (e. g. due to fogging or icing), the Adaptive Highbeam Assist function is deactivated.
With bright lights that appear suddenly (e.g. street lamps, traffic lights, illumination of lots), the high beams are deactivated.
Some reflectors cannot be clearly differentiated by road users (e.g. motorcyclists). The high beams are deactivated because of the danger of dazzling other road users.
| Function schematic for Adaptive High Beam Assist | Model 205 as of model year 2019 | PE82.10-P-2066-97FBB | |
| Model 205 up to model year 2019, model 253 | PE82.10-P-2066-97FBA | ||
| Overview of exterior lights system components | GF82.10-P-9998RF |