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Function of Adaptive Highbeam Assist - GF82.10-P-3091CAM

MODEL 207.3/4 as of model year 2014 with CODE 608 (Automatic high beam control) without CODE 628 (INTELLIGENT HEADLAMP CONTROL PLUS (IHC+)) 

MODEL 207.3/4 as of model year 2014 with CODE 628 (INTELLIGENT HEADLAMP CONTROL PLUS (IHC+)) without CODE 608 (Automatic high beam control) 

Function requirements, general 

IMPORTANT Detailed information on the operating state of the transport mode is given in the separate function description "Energy management, function".

The CDI control unit (N3/9) (with diesel engine) or the ME-SFI [ME] control unit (N3/10) (with gasoline engine) sends the "Engine running" or "Drive train operational" signal via chassis CAN 1 (CAN E1) to the front SAM control unit with fuse and relay module (N10/1).

Selection and enabling of the Adaptive Highbeam Assist is conducted on the instrument cluster's control level. The instrument cluster sends the corresponding status via interior CAN (CAN B) to the front SAM control unit.

The "Low beams ON" status is generated by the front SAM control unit itself. To do so, the front SAM control unit reads in the status of the exterior lights switch directly and the data of the rain/light sensor over the wiper/inside rearview mirror LIN (LIN 2), and sends the "Low beams ON" signal over the chassis CAN 2 (CAN E2) to the left headlamp control unit (E1n9) and to the right headlamp control unit (E2n9). When the low beams are switched on, the low beams indicator lamp (A1e67) in the instrument cluster is actuated. To this end, the front SAM control unit sends the "Switch on low beams indicator lamp" request via interior CAN to the instrument cluster.

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.

Vehicle without code (23P) Driving Assistance package Plus:

The front SAM control unit sends the enable status over chassis CAN 2 to the multifunction camera (A40/11).

Vehicle with code (23P) Driving Assistance Package Plus:

The front SAM control unit sends the enable status over chassis CAN 2, the chassis gateway control unit (N93/7) and the chassis FlexRay (Flex E) to the stereo multifunction camera (A40/13).

The multifunction camera is the master control unit for the Adaptive Highbeam Assist.

Adaptive Highbeam Assist, general 

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 infrastructure. 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, among other things, to implement the function:

The data from the steering angle sensor (N49) is read in by the steering column tube module control unit directly, and it calculates the steering angle.

Vehicle without code (23P) Driving Assistance package Plus:

The steering column tube module control unit sends the information on the steering angle over the chassis CAN 1, front SAM control unit and chassis CAN 2 to the multifunction camera.

Vehicle with code (23P) Driving Assistance Package Plus:

The steering column tube module control unit sends the information on the steering angle over the chassis CAN 1, front SAM control unit, chassis CAN 2, chassis gateway control unit, and the chassis FlexRay to the stereo multifunction camera.

The vehicle speed is calculated on the basis of the wheel speeds.

Vehicle without code (23P) Driving Assistance package Plus:

The Electronic Stability Program control unit (N30/4) sends the information on the wheel speeds over chassis CAN 1, the front SAM control unit and chassis CAN 2 to the multifunction camera.

Vehicle with code (23P) Driving Assistance Package Plus:

The Electronic Stability Program control unit sens the information on the wheel speeds over chassis CAN 1, the front SAM control unit, chassis CAN 2, the chassis gateway control unit and the chassis FlexRay to the stereo multifunction camera.

The yaw behavior of the vehicle is detected by the yaw rate sensor for lateral and longitudinal acceleration (B24/15).

Vehicle without code (23P) Driving Assistance package Plus:

The yaw rate sensor for lateral and longitudinal acceleration sends the information on the vehicle's yaw characteristics over the vehicle dynamics CAN, Electronic Stability Program control unit, chassis CAN 1, front SAM control unit and chassis CAN 2 to the multifunction camera.

Vehicle with code (23P) Driving Assistance Package Plus:

The yaw rate sensor for lateral and longitudinal acceleration sends the information on the vehicle's yaw characteristics over the vehicle dynamics CAN, Electronic Stability Program control unit, chassis CAN 1, the front SAM control unit, chassis CAN 2, the chassis gateway control unit and the chassis FlexRay to the stereo multifunction camera.

A differentiation is made between the following Adaptive Highbeam Assist functional states:

Fig 1: Identifying Partial High Beam Range
G10081945Courtesy of MERCEDES-BENZ USA

Optical headlamp range adjustment (as of approx. v = 25 km/h) 

Irrespective of the vehicle's distance to other road users and the road geometry (height difference, angle), the multifunction camera sends the "Optical headlamp range adjustment" request to the headlamp control units.

Vehicle without code (23P) Driving Assistance package Plus:

The multifunction camera sends the "Optical headlamp range adjustment" request over the chassis CAN 2 to the headlamp control units.

Vehicle with code (23P) Driving Assistance Package Plus:

The stereo multifunction camera sends the "Optical headlamp range adjustment" request over the chassis FlexRay, chassis gateway control unit, and chassis CAN 2 to the headlamp control units.

The left headlamp control unit actuates the left headlamp range adjustment actuator motor (E1m1) directly and the low beam in the left front Vario LED lamp unit (E1e22) over the left headlamp LIN (LIN G1) and the left front exterior lights LED actuation module (E1n7).

The right headlamp control unit actuates the right headlamp range adjustment actuator motor (E2m1) directly and the low beam in the right front Vario LED lamp unit (E2e22) over the right headlamp LIN (LIN G2) and the right front exterior lights LED actuation module (E2n7).

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 headlamp light cone 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.

Vehicle without code (23P) Driving Assistance package Plus:

The multifunction camera sends the "High beams ON" request over the chassis CAN 2 to the headlamp control units.

Vehicle with code (23P) Driving Assistance Package Plus:

The stereo multifunction camera sends the "High beams ON" request over the chassis FlexRay, chassis gateway control unit, and chassis CAN 2 to the front SAM control unit and the headlamp control units.

The activated function is visually indicated to the driver. To this end, the front SAM control unit sends the "High beams ON" request via interior CAN to the instrument cluster. The instrument cluster then actuates the high beam indicator lamp (A1e3).

The left headlamp control unit actuates the left light distribution actuator motor (E1m3) directly and actuates the high beam in the left front Vario LED lamp unit over the left headlamp LIN and the left front exterior lights LED actuation module.

The right headlamp control unit actuates the right light distribution actuator motor (E2m3) directly and the high beam in the right front Vario LED lamp unit over the right headlamp LIN, and the right front exterior lights LED actuation module.

On roads with street lamps positioned regularly, the automatic high beams are deactivated.

Partial high beam (as of approx. v = 45 km/h) (with code (628) (AUTOMATIC HIGH BEAM CONTROL PLUS (IHC+) 

If other road users are detected, the multifunction camera activates the partial high beam function. The activated function is visually indicated to the driver. To this end, the front SAM control unit sends the "High beams ON" request via interior CAN to the instrument cluster. The instrument cluster actuates the high beams indicator lamp.

Fig 2: Overview Of Optical Headlamp Range Adjustment
G10083291Courtesy of MERCEDES-BENZ USA

Vehicle without code (23P) Driving Assistance package Plus:

Irrespective of the vehicle's distance to other road users and the road geometry (height difference, angle), the multifunction camera sends the "Light output setting" and the "Rotation angle setting" request over chassis CAN 2 to the headlamp control units.

Vehicle with code (23P) Driving Assistance Package Plus:

Irrespective of 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, chassis gateway control unit and the chassis CAN 2 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 exterior lights LED actuation module. The left front exterior lights LED actuation module increases the light output for the high beam in the left front Vario LED lamp unit.

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 exterior lights LED actuation module. The right front exterior lights LED actuation module increases the light output for the high beam in the right front Vario LED lamp unit

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 (∠= 35°). On streets with structural separation (e.g. guardrails on freeways) the headlamps of oncoming vehicles are often concealed. These vehicles are not 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, are 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.

Lights that are visible for a long time and that slowly become brighter (e.g. with partial concealment of the headlamps by trees) make it more difficult to recognize oncoming vehicles.

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 Highbeam Assist   PE82.10-P-2066-97EAB
  Overview of exterior lights system components   GF82.10-P-9998CAM 
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