Function Of Adaptive Highbeam Assist - GF82.10-P-3091RR
Model 190
With Code 608 (Adaptive Highbeam Assist)
Function requirements, general
- No overvoltage or undervoltage
- Transport mode not active
Detailed information on the operating state of the transport mode is given in the separate function description "Energy management, function".
- "Engine running" or "drive train operational" signal on
- Function in instrument cluster (A1) activated
- Low beam ON
Low beam actuation is also active during high beam actuation and is described in the document titled, "Driving lights actuation, function".
- Combination switch (S4) in "High beams" position
The ME-SFI [ME] control unit (N3/10) sends the "Engine running" or
"Drivetrain operational" signal via the drive train CAN (CAN C1), powertrain control unit (N127), and chassis CAN 1 (CAN E1) to the front SAM control unit with fuse and relay module (N10/1).
Selection and enabling of the Adaptive High Beam Assist is conducted on the instrument cluster's control level. The instrument cluster sends the corresponding status via the user interface CAN (CAN HMI), AMG gateway control unit (N93/9), and interior CAN to the front SAM control unit.
The steering column tube module control unit (N80) reads in the switch position of the combination switch directly and sends this over chassis CAN 1 to the front SAM control unit.
The front SAM control unit, as the exterior lights master control unit, reads in the function requirements and enables the Adaptive Highbeam Assist function.
The front SAM control unit sends the enable status via the chassis CAN 2 (CAN E2) to the multifunction camera (A40/11).
The multifunction camera is the master control unit for the Adaptive High Beam Assist.
Function sequence for adaptive high beams
The traffic and environment situation in front of the vehicle is detected by the multifunction camera and accordingly evaluated. Actuating the actuators integrated in the left front lamp unit (E1) and the right front lamp unit (E2) serves to ensure that the road is ideally illuminated without dazzling any of the 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. The steering column tube module control unit sends information on the steering angle via the chassis CAN 1, front SAM control unit, and chassis CAN 2 to the multifunction camera.
The vehicle speed is calculated on the basis of the wheel speeds. The Electronic Stability Program control unit (N30/4) sends information on the wheel speeds via the chassis CAN 1, front SAM control unit, and chassis CAN 2 to the multifunction camera.
The yaw behavior of the vehicle is detected by the turn rate sensor for lateral and longitudinal acceleration (B24/15). The turn rate sensor for lateral and longitudinal acceleration sends information on the vehicle's yaw characteristics via the vehicle dynamics CAN (CAN H), Electronic Stability Program control unit, chassis CAN 1, front SAM control unit, and chassis CAN 2 to the 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.
Optical headlamp range adjustment (as of approx. v = 25 km/h)
The multifunction camera sends the "Optical headlamp range adjustment" request via the chassis CAN 2 to the left headlamp control unit (E1n9) and the right headlamp control unit (E2n9) in relation to the distance of the vehicle to other road users and the geometry of the road (level differences, angle).
The left headlamp control unit 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 headlamp units of the front lamp units are raised accordingly. The road surface is better illuminated without causing a dazzling effect for 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, the multifunction camera activates the automatic high beams function.
The multifunction camera sends the "High beams ON" request over the chassis CAN 2 to the headlamp control units.
The activated function is visually indicated to the driver. For this purpose, the front SAM control unit sends the "High beams ON" status via the interior CAN, AMG gateway control unit, and user interface CAN to the instrument cluster, which then actuates the high beams indicator lamp (A1e3).
The left headlamp control unit directly actuates the left high beam (E1e1).
The right headlamp control unit directly actuates the right high beam (E2e1).
On roads with street lamps positioned regularly, the automatic high beams are deactivated.
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 detection angle (α = 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.
A reduced range of vision (snow, fog, rain) can result in a reduced recognition performance.
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 any restricted multifunction camera range of vision (fogging or icing), the Adaptive Highbeam Assist function is deactivated.
With bright lights that appear suddenly (e.g. street lamps, traffic lights, lot illumination), the automatic high beams are deactivated.
Some reflectors cannot be clearly differentiated by road users (e.g. motorcyclists). The automatic high beams are deactivated because of the existing danger of dazzling other road users.
| Function schematic for Adaptive High Beam Assist | PE82.10-P-2066-97HBA | ||
| Overview of exterior lights system components | GF82.10-P-9998RR |