Adaptive Highbeam Assist, Function - GF82.10-P-3091LF
Model 217, 222 with code 608 (Adaptive Highbeam Assist)
Model 217, 222 with code 628 (Adaptive Highbeam Assist Plus)
Function requirements, general
- No overvoltage or undervoltage
- Transport mode not active
- "Engine running" or "drive train operational" signal on
- Low beam ON
Low beams actuation is active during high beams actuation.
- Function in instrument cluster (A1) activated (model 222 up to 31.05.2017, model 217 up to 30.11.2017)
- 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 Adaptive Highbeam Assist is selected and enabled by using the instrument cluster's control level (model 222 up to 31.05.2017, model 217 up to 30.11.2017). The instrument cluster sends the enable to the front SAM control unit via the user interface CAN (CAN HMI), electronic ignition lock control unit and the interior CAN.
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, as the exterior lights master control unit, reads in all function requirements, evaluates these and enables the Adaptive High Beam Assist function.
Vehicle without code P20 (Driving assistance package Plus) and without code 23P (Driving assistance package):
The front SAM control unit sends the approval over the interior CAN, electronic ignition lock control unit and periphery CAN to the mono multifunction camera (A40/11).
Vehicle with code P20 (Driving Assistance package Plus) or 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 high beams
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 realize the function:
- 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.
Vehicle without code P20 (Driving assistance package Plus) and without code 23P (Driving assistance package):
The steering column tube module control unit sends the information on the steering angle over the chassis FlexRay, electronic ignition lock control unit and the periphery CAN to the mono multifunction camera.
Vehicle with code P20 (Driving Assistance package Plus) or with code 23P (Driving Assistance package):
The steering column tube module control unit sends the information on the steering angle over the chassis FlexRay to the stereo multifunction camera.
The vehicle speed is calculated on the basis of the wheel speeds.
Vehicle without code P20 (Driving assistance package Plus) and without 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.
Vehicle with code P20 (Driving Assistance package Plus) or 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 vehicle's yaw characteristics are detected by the yaw rate sensor for lateral and longitudinal acceleration (B24/15) (model 222 up to 31.05.2017, model 217 up to 30.11.2017) or by the acceleration sensor integrated into the SRS control unit (N2/10) (model 222 as of 01.06.2017, model 217 as of 01.12.2017).
Model 222 up to 31.05.2017, model 217 up to 30.11.2017, without code P20 (Driving Assistance Plus Package) and without code 23P (Driving Assistance Package):
The turn rate, lateral acceleration and longitudinal acceleration sensor sends the information on the vehicle's yaw characteristics via the dynamics CAN (CAN H), Electronic Stability Program control unit, chassis FlexRay, electronic ignition lock control unit and the periphery CAN to the mono multifunction camera.
Model 222 up to 31.05.2017, model 217 up to 30.11.2017, with code P20 (Driving Assistance Plus Package) or with code 23P (Driving Assistance Package):
The turn rate, lateral acceleration and longitudinal acceleration sensor sends the information on the vehicle's yaw characteristics via the dynamics CAN, Electronic Stability Program control unit and the chassis FlexRay to the stereo multifunction camera.
Model 222 as of 01.06.2017, model 217 as of 01.12.2017, without code P20 (Driving Assistance Plus Package) and without 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.
Model 222 as of 01.06.2017, model 217 as of 01.12.2017, with code P20 (Driving Assistance Plus Package) or 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 (in model 222 up to 31.05.2017 and model 217 up to 30.11.2017 as of approx. v = 45 km/h, in model 222 as of 01.06.2017 and model 217 as of 01.12.2017 as of approx. v = 30 km/h) (in code 628 (Adaptive Highbeam Assist Plus))
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 at the time of activation a vehicle driving ahead is detected that has dropped below a defined distance. The switch-off threshold is at approx. v = 30 km/h when the partial high beams are 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).
Vehicle without code P20 (Driving assistance package Plus) and without 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).
Vehicle with code P20 (Driving Assistance package Plus) or with code 23P (Driving Assistance package):
The stereo multifunction camera sends 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.
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 headlamp light cone varies between s = 65 (standard lighting) and 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.
Vehicle without code P20 (Driving assistance package Plus) and without 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 P20 (Driving Assistance package Plus) or 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. Here, the front SAM control unit sends the "High beams indicator lamp ON" request via interior CAN, electronic ignition lock control unit and user interface CAN to the instrument cluster, which then actuates the high beams indicator lamp.
Model 217, model 222 except code 641 (Left-hand traffic dynamic LED headlamp) and except code 642 (Right-hand traffic dynamic LED headlamp), model 222 with code 641 (Left-hand traffic dynamic LED headlamp) or code 642 (Right-hand traffic dynamic LED headlamp) up to 31.05.2017:
The left headlamp control unit actuates the left low beam (E1e1) via the left headlamp LIN and the left front actuation module, LED exterior lighting (E1n7).
The right headlamp control unit actuates the right high beam (E2e1) via the right headlamp LIN and the front right actuation module, LED exterior lighting (E2n7).
For vehicles with code 641 (Dynamic left-hand traffic LED headlamp) or code 642 (Dynamic right-hand traffic LED headlamp), the left headlamp control unit actuates the left light distribution actuator motor (E1m3). The right headlamp control unit actuates the right light distribution actuator motor (E2m3).
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.
Model 222 as of 01.06.2017 with code 641 (Left-hand traffic dynamic LED headlamp) or code 642 (Right-hand traffic dynamic LED headlamp):
The left headlamp control unit evaluates all of the relevant information and transmits the "High beams light distribution" request via the periphery 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. At high speeds and fixed driving straight ahead, the front left lamp unit LED matrix control unit additionally controls the left additional high beam (E1e32) and the front right lamp unit LED matrix control unit the right additional high beam (E2e32). On roads with street lamps positioned regularly, the automatic high beams are deactivated.
Partial high beam (in model 222 up to 31.05.2017 and model 217 up to 30.11.2017 as of approx. v = 45 km/h, in model 222 as of 01.06.2017 and model 217 as of 01.12.2017 as of approx. v = 30 km/h) (in code 628 (Adaptive Highbeam Assist Plus))
If other road users are detected while the automatic high beams function is active, the multifunction camera activates the partial high beam function. The activated function is visually indicated to the driver. Here, the front SAM control unit sends the "High beams indicator lamp ON" request via interior CAN, electronic ignition lock control unit and user interface CAN to the instrument cluster, which then actuates the high beams indicator lamp.
Schematic diagram of partial high beam light distribution
Vehicle without code P20 (Driving assistance package Plus) and without 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.
Vehicle with code P20 (Driving Assistance package Plus) or 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.
Model 217, model 222 except code 641 (Left-hand traffic dynamic LED headlamp) and except code 642 (Right-hand traffic dynamic LED headlamp), model 222 with code 641 (Left-hand traffic dynamic LED headlamp) or code 642 (Right-hand traffic dynamic LED headlamp) up to 31.05.2017:
The left headlamp control unit synchronizes the right headlamp control unit via the periphery CAN and controls the left light distribution actuator motor directly and sends the "Increase light output" request via the left headlamp LIN to the front left actuation module, LED exterior lighting. The left front actuation module, LED exterior lighting increases the lighting performance of the left high beam.
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 lighting performance of the right high beam.
Model 222 as of 01.06.2017 with code 641 (Left-hand traffic dynamic LED headlamp) or code 642 (Right-hand traffic dynamic LED headlamp):
The left headlamp control unit evaluates all of the relevant information and sends the "High beams light distribution" request and the relevant object data via the periphery 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.
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.
When bright lights appear suddenly (e.g. street lamps, traffic lights, illumination of lots), the high beam is deactivated.
Some reflectors cannot be clearly differentiated from 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 | PE82.10-P-2066-97SEA | ||
| Overview of exterior lights system components | GF82.10-P-9998LF |