Function of Adaptive Highbeam Assist - GF82.10-P-3091FQ
MODEL 218 as of model year 2015 with CODE 628 (INTELLIGENT HEADLAMP CONTROL PLUS (IHC+)) with CODE 640 (Full LED USA incl. ACTIVE MULTIBEAM LED)
MODEL 218 as of model year 2015 with CODE 628 (INTELLIGENT HEADLAMP CONTROL PLUS (IHC+)) with CODE 641 (Full LED headlamps incl. ILS and ACTIVE MULTIBEAM LED (USP!) incl. new lamp design, dynamic LED for left-hand traffic)
MODEL 218 as of model year 2015 with CODE 628 (INTELLIGENT HEADLAMP CONTROL PLUS (IHC+)) with CODE 642 (Full LED headlamps incl. ILS and ACTIVE MULTIBEAM LED (USP!) incl. new lamp design, dynamic LED for right-hand traffic)
MODEL 218 up to model year 2015 with CODE 608 (Adaptive Highbeam Assist) with CODE 621 (Intelligent Light System (left-hand traffic))
MODEL 218 up to model year 2015 with CODE 608 (Adaptive Highbeam Assist) with CODE 622 (Intelligent Light System (right-hand traffic))
Function requirements, general
- No overvoltage or undervoltage (on-board electrical system voltage U ≥7 ≤17.5 V)
- Transport mode not activated (as of 01.06.2012)
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
- Low beams On (auto on/off driving lights)
- Combination switch (S4) in "High beams" position
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 "Drivetrain operational" signal via chassis CAN (CAN E) (up to 28.02.2013) or chassis CAN 1 (CAN E1) (as of 01.03.2013) to the front SAM control unit with fuse and relay module (N10/1).
The steering column tube module control unit (N80) reads in the switch position of the combination switch directly and sends this over the chassis CAN (up to 28.02.2013) or chassis CAN 1 (as of 01.03.2013) 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.
On vehicles with code (608) Adaptive Highbeam Assist or code (22P) Lane Tracking package, the front SAM control unit sends the release status via the front end CAN (CAN G) (up to 28.02.2013) or the chassis CAN 2 (CAN E2) (as of 01.03.2013) Multifunction camera (A40/11).
On vehicles with code (23P) Driving assistance package, the front SAM control unit sends the release status via the chassis CAN 2, chassis gateway control unit (N93/7), and 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 and, if necessary, the color and movement of detected objects to differentiate between preceding or oncoming road users, street lights, signs or other objects in 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, among other things, to implement the adaptive high beams function:
- Steering angle
- Vehicle speed
- Vehicle yaw behavior (vehicle movement)
Vehicle with code (608) Adaptive Highbeam Assist or with code (22P) Lane Tracking package:
The steering angle sensor (N49) records the rotational movement at the steering wheel. The steering column tube module control unit directly reads in the data from the steering angle sensor, calculates the steering angle, and sends information about the steering angle via the chassis CAN (up to 28.02.2013) or chassis CAN 1 (as of 01.03.2013), front SAM control unit and front end CAN (up to 28.02.2013) or chassis CAN 2 (as of 01.03.2013) to the multifunction camera.
The vehicle speed is calculated on the basis of the wheel speeds. The Electronic Stability Program control unit (N30/4) (without code (233) DISTRONIC PLUS and without engine 157) or the Premium Electronic Stability Program control unit (N30/7) (with code (233) DISTRONIC PLUS or with engine 157) sends information on the wheel speeds via the chassis CAN (up to 28.02.2013) or chassis CAN 1 (as of 01.03.2013) and front SAM control unit, front end CAN (up to 28.02.2013) or chassis CAN 2 (as of 01.03.2013) to the multifunction camera.
The yaw behavior of the vehicle is detected by the yaw rate sensor for lateral and longitudinal acceleration (B24/15). This sends corresponding information over the dynamics CAN (CAN H), Electronic Stability Program control unit, chassis CAN (up to 28.02.2013) or chassis CAN 1 (as of 01.03.2013), the front SAM control unit and the front end CAN (up to 28.02.2013) or chassis CAN 2 (as of 01.03.2013) to the multifunction camera.
Vehicle with code (23P) Driving Assistance package:
The steering angle sensor records the rotational movement at the steering wheel. The steering column tube module control unit directly reads in the data from the steering angle sensor, calculates the steering angle, and sends information on the steering angle via the chassis CAN 1, chassis gateway control unit, and chassis FlexRay to the stereo multifunction camera.
The vehicle speed is calculated on the basis of the wheel speeds. The Electronic Stability Program control unit sends information on the wheel speeds via the chassis CAN 1, chassis gateway control unit, and 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. This sensor sends corresponding information via the vehicle dynamics CAN, Electronic Stability Program control unit, chassis CAN 1, chassis gateway control unit, and chassis FlexRay to the stereo multifunction camera.
A differentiation is made between the following Adaptive Highbeam 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)
If no other road users are detected, the high beams are activated.
- Partial high beam (as of approx. v = 45 km/h) (with code (628) AUTOMATIC HIGH BEAM CONTROL PLUS (IHC+))
The partial high beam places road users in the low beam section of the light cone thereby omitting them from the high beam.
Optical headlamp range adjustment (as of approx. v = 25 km/h)
Vehicles up to 31.08.2014:
Depending on the distance of the vehicle to other road users and the geometry of the road (differences in height, angle), the multifunction camera sends the "Optical headlamp range adjustment" request via the front end CAN (up to 28.02.2013) or chassis CAN 2 (as of 01.03.2013) to the following control units:
- Left headlamp control unit (E1n9)
- Right headlamp control unit (E2n9)
The left headlamp control unit then actuates the left headlamp range adjustment actuator motor (E1m1). The right headlamp control unit actuates the right headlamp range adjustment actuator motor (E2m1).
The headlamp units of the front lamp units are raised. 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.
Vehicles as of 01.09.2014:
Depending on the distance of the vehicle to other road users and the geometry of the road (height differences, angle), the "Optical headlamp range adjustment" request on vehicles with code (22P) Lane Tacking package is sent by the multifunction camera via the chassis CAN 2, and on vehicles with code (23P) Driving assistance package, via the chassis FlexRay, chassis gateway control unit, and chassis CAN 2 to the left headlamp control unit.
The left headlamp control unit then 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.
Actuation of the light distribution actuator motors causes the parts of the previously covered light beam to be released for illuminating the road. 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.
The headlamp control units operate in a master-slave combination whereby the left headlamp control unit acts as the master and synchronizes the right headlamp control unit over chassis CAN 2.
Automatic high beams (as of approx. v = 30 km/h)
If the multifunction camera detects no other road users in front or behind, the automatic high beams are activated.
To do so, the multifunction camera sends the "High beams On" request to the respective control unit. The high beam actuation is then activated.
Vehicles up to 31.08.2014:
The multifunction camera sends the "High beams on" request over the front end CAN (up to 28.02.2013) or chassis CAN 2 (as of 01.03.2013) to the headlamp control units. The left headlamp control unit directly actuates the left headlamp range adjustment actuator motor and sends the "Switch on high beams" request via the left headlamp LIN to the left front actuation module 2, LED exterior lighting (E1n8), which then actuates the left low beam (long range) (E1e16). The right headlamp control unit directly actuates the right headlamp range adjustment actuator motor and sends the "Switch on high beams" request via the right headlamp LIN to the right front actuation module 2, LED exterior lighting (E2n8), which then actuates the right low beam (long range) (E2e16).
Vehicles as of 01.09.2014:
The multifunction camera sends the "High beams On" request on vehicles with code (22P) Lane Tracking package via the chassis CAN 2, and on vehicles with code (23P) Driving assistance package, via the chassis FlexRay, chassis gateway control unit, and chassis CAN 2 to the left headlamp control unit.
The left headlamp control unit then actuates the left light distribution actuator motor. The right headlamp control unit actuates the right light distribution actuator motor.
The current position of the left light distribution actuator motor is detected by the left light distribution position sensor and the position of the right light distribution actuator motor is detected by the right light distribution position sensor. The signals of the light distribution position sensors are evaluated by the respective headlamp control unit.
Actuation of the light distribution actuator motors causes the entire light beam to be released for illuminating the road.
The headlamp control units operate in a master-slave combination whereby the left headlamp control unit acts as the master and synchronizes the right headlamp control unit over chassis CAN 2. In addition, the left headlamp control unit sends the "High beams On" request via the chassis CAN 2 to the left front LED matrix lamp unit control unit (E1n11) and to the right front LED matrix lamp unit control unit (E2n11).
The left front LED matrix lamp unit control unit actuates the left front adaptive high beam (E1e24). The right front LED matrix lamp unit control unit actuates the right front adaptive high beam (E2e24).
The adaptive high beams are equipped with 24 LEDs each, which can be actuated independently of each other. The formation and intensity of the light cone can be influenced depending on which LEDs are actuated.
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 by the multifunction camera when the automatic high beams function is activated, the multifunction camera activates the partial high beams function. The activated function is visually indicated to the driver.
Depending on the distance of the vehicle to other road users and the geometry of the road (height differences, angle), the "Increase light output" and "Rotation angle setting" request on vehicles with code (22P) Lane Tracking package is sent by the multifunction camera via the chassis CAN 2, and on vehicles with code (23P) Driving assistance package, via the chassis FlexRay, chassis gateway control unit, and chassis CAN 2 to the front LED matrix lamp unit control units. The front LED matrix lamp unit control units actuate the adaptive high beams correspondingly. Illumination past the side of the object detected is optimized. The dazzling effect is minimized by omitting the object from the light cone.
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 cannot be recognized by the multifunction camera.
Due to the geometry of the structural separation and the location of the headlamps on the vehicle, the drivers of the oncoming passenger 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.
The high beams are deactivated when bright lights appear suddenly (e.g. street lamps, traffic lights, illumination of lots).
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 | MODEL 218 up to model year 2015 with CODE 608 (Adaptive Highbeam Assist) with CODE 621 (Intelligent Light System (left-hand traffic)) MODEL 218 up to model year 2015 with CODE 608 (Adaptive Highbeam Assist) with CODE 622 (Intelligent Light System (right-hand traffic)) | PE82.10-P-2066-97XAA |
| Function schematic for Adaptive Highbeam Assist | MODEL 218 as of model year 2015 with CODE 628 (INTELLIGENT HEADLAMP CONTROL PLUS (IHC+)) with CODE 640 (Full LED USA incl. ACTIVE MULTIBEAM LED) MODEL 218 as of model year 2015 with CODE 628 (INTELLIGENT HEADLAMP CONTROL PLUS (IHC+)) with CODE 641 (Full LED headlamps incl. ILS and ACTIVE MULTIBEAM LED (USP!) incl. new lamp design, dynamic LED for left-hand traffic) MODEL 218 as of model year 2015 with CODE 628 (INTELLIGENT HEADLAMP CONTROL PLUS (IHC+)) with CODE 642 (Full LED headlamps incl. ILS and ACTIVE MULTIBEAM LED (USP!) incl. new lamp design, dynamic LED for right-hand traffic) | PE82.10-P-2066-97XAB |
| Overview of exterior lights system components | GF82.10-P-9998FQ |