(Additional Functions For Driving Lights Actuation, Function - GF82.10-P-3050GR)
Model 166
up to Model year 2016
with CODE 608 (Adaptive Highbeam Assist)
Model 166
up to Model year 2016
with CODE 615 (Bi-xenon headlamp unit with integrated curve illumination)
Model 166
up to Model year 2016
with CODE 621 (Intelligent Light System (left-hand traffic))
Model 166
up to Model year 2016
with CODE 622 (Intelligent Light System (right-hand traffic))
Function requirements, general
- No overvoltage or undervoltage
- Transport mode not activated (as of 01.07.2012)
- Low beam ON
- "Engine running" or "Drive train ready" signal set or vehicle speed v > 3 km/h
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) (diesel engine) or the ME-SFI [ME] control unit (N3/10) (gasoline engine) transmits the "Engine running" or "Drive train operational" signal over the chassis CAN 1 (CAN E1), electronic ignition lock control unit (N73) and chassis CAN 2 (CAN E2) to the headlamp control unit (N71/1) and the multifunction camera (A40/11) (with CODE (608) Adaptive Highbeam Assist) and over the interior CAN (CAN B) to the SAM control unit (N10).
Additional functions, driving lights actuation, general
The additional functions of driving lights actuation permit optimum illumination of the roadway for different road and weather conditions. This is done by increasing the luminous power or through targeted actuation of additional light sources and various actuators in the left front lamp unit (E1) or in the right front lamp unit (E2).
Driving lights actuation is active during actuation of the additional driving lights functions; this is described in the separate "Driving lights actuation, function" document.
The driving lights actuation additional functions are comprised of the following subfunctions:
- Function sequence for cornering lights (with CODE 621 (Intelligent Light System (left-hand traffic)) or CODE 622 (Intelligent Light System (right-hand traffic)))
- Function sequence, dynamic curve illumination
- Function sequence for active light distribution (with CODE 621 (Intelligent Light System) (left-hand traffic) or CODE 622 (Intelligent Light System) (right-hand traffic) and CODE 608 (Adaptive Highbeam Assist))
Additional function requirements for cornering lights (with CODE 621 (Intelligent Light System (left-hand traffic)) or CODE 622 (Intelligent Light System (right-hand traffic)))
- Turn signaling active and speed v < 40 km/h (except CODE 494 (USA version)) or v < 60 km/h (with CODE 494 (USA version)) or steering angle recognized and speed v < 70 km/h
- Radius of curve r ≤ 80 m
Function sequence for cornering lights (with CODE 621 (Intelligent Light System (left-hand traffic)) or CODE 622 (Intelligent Light System (right-hand traffic)))
The direct input factors of the cornering lights actuation are the steering wheel angle, recorded by the steering wheel angle sensor (N49), and the turn signaling function, defined by the switch position of the combination switch (S4), since they describe the driver's required direction.
The vehicle speed influences the actuation characteristic for cornering lights actuation. At a slower vehicle speed a lower switch-on point is required to ensure that the cornering light actuation can be activated early in urban traffic.
Schematic of light distribution for active cornering lights actuation
The data of the steering wheel angle sensor and the switch position of the combination switch are directly read in by the steering column tube module control unit (N80) and this forwards them over the chassis CAN 1, electronic ignition lock control unit and chassis CAN 2 to the headlamp control unit.
The vehicle speed is calculated on the basis of the wheel speeds. To do so, the Electronic Stability Program control unit (N30/4) sends the corresponding data via chassis CAN 1, electronic ignition lock control unit and chassis CAN 2 to the instrument cluster (A1). The instrument cluster calculates the vehicle speed to be displayed and sends this over chassis CAN 2 to the headlamp control unit.
The headlamp control unit evaluates all data and sends the request "Cornering lights ON" via left headlamp LIN (LIN G1) to the left front actuation module, LED exterior lighting (E1n7) or via right headlamp LIN (LIN G2) to the right front actuation module, LED exterior lighting (E2n7).
The left front actuation module, LED exterior lighting then actuates the left cornering light (E1e9).
The right front actuation module, LED exterior lighting then actuates the right cornering light (E2e9).
Only one cornering light is actuated: the light on the inside of the curve during forward travel and the light on the outside of the curve during reverse travel. If however, there is a rapid change in the steering wheel angle or in the turn signaling request, both corner-illuminating fog lamps may illuminate briefly. The corresponding cornering light is switched on and off with dimming.
The request by the turn signaling function has a higher priority below a speed of v = 40 km/h than the request by the detection of the steering wheel angle in order to ensure the illumination of the edge of the road on the inside of the curve when the steering wheel is turned and turning in the opposite direction (situation at traffic circles). When the reverse gear is engaged, only the data of the steering wheel angle sensor is evaluated.
Gear range "R" is engaged by the fully integrated transmission control unit (Y3/8n4). Following this, the fully integrated transmission control unit sends the status "Gear range R engaged" via drive train CAN (CAN C), CDI control unit or ME [ME-SFI] control unit and chassis CAN 1 to the electronic ignition lock control unit. The electronic ignition lock control unit uses it to generate the "Reverse gear engaged" status and sends it to the headlamp control unit via chassis CAN 2.
If the cornering lights function is requested simultaneously by the detected steering wheel angle and the turn signaling function, the actuation sensitivity is increased. The corresponding cornering light is actuated as soon as a curve radius of r ≤ 450 m is detected.
When the function request suddenly no longer exists, the corresponding cornering light remains switched on for a holding time of approx. t = 2 s and is switched off within t = 2 s with dimming.
Additional function requirements for dynamic curve illumination
- Function "Intell. Light System:" Activated in the "Lights" menu in the instrument cluster
- Vehicle moving forward
- The "extended fog light function" (with CODE 621 (Intelligent Light System (left-hand traffic)) or CODE 622 (Intelligent Light System (right-hand traffic))) is deactivated
The function is manually released through the operation level in the instrument cluster. The instrument cluster sends the corresponding status over the interior CAN to the SAM control unit and over the chassis CAN 2 to the headlamp control unit.
Function sequence, dynamic curve illumination
Dynamic curve illumination improves the road illumination when cornering. For this the low beam cone is swiveled horizontally towards the center point of the curve.
Conventional bi-xenon headlamps serve as a basis, the headlamp units of which are supported in retaining frames so that they can swivel. When steering into a curve, the headlamp unit on the inside of the curve is swiveled up to α = 15°, the headlamp unit on the outside of the curve up to α = 7.5°.
Schematic diagram of light distribution for active dynamic curve illumination function
The dynamic curve illumination function is dependent on the following control variables:
- Steering wheel angle
- Vehicle speed
- Vehicle yaw behavior (vehicle movement)
The direct input factor is the steering wheel angle, the vehicle speed influences the function's control response (gear ratio of steering wheel angle to swivel angle).
At a low vehicle speed, a smaller conversion is required so that the light pattern does not behave in a jumpy manner (e.g. in urban traffic). At medium speeds an immediate response is given to relatively minor changes in the steering angle and at higher speeds the responses are dampened again to a greater extent. To compensate for the natural oscillating movement of the vehicle when driving straight ahead, an area with lower sensitivity and enhanced damping has been provided (approx. ± 6° steering angle).
The steering column tube module control unit sends the data of the steering wheel angle sensor and the Electronic Stability Program control unit sends information on the vehicle's movement via chassis CAN 1, electronic ignition lock control unit and chassis CAN 2 to the headlamp control unit.
The yaw rate sensor for lateral and longitudinal acceleration (B24/15) records the vehicle's own movement and sends corresponding information over the vehicle dynamics CAN (CAN H) to the Electronic Stability Program control unit.
The instrument cluster sends the vehicle speed over the chassis CAN 2 to the headlamp control unit.
The headlamp control unit reads in all the relevant information, evaluates it and actuates accordingly the left active curve lights actuator motor (E1m2) over the left headlamp LIN and the right active curve lights actuator motor (E2m2) over the right headlamp LIN.
The position of the active curve lights actuator motors at any given time and any faults that occur, such as short circuits or open circuits, are reported back to the headlamp control unit.
If the curve illumination actuation is defective, the headlamp units are, if possible, swiveled into the central position.
If an active curve lights actuator motor malfunctions, the left light distribution actuator motor (E1m3) or the right light distribution actuator motor (E2m3) is actuated to cover up the rising part of the light-dark boundary and thereby reduce the glare for oncoming traffic.
Additional function requirements for active light distribution (with CODE 621 (Intelligent Light System (left-hand traffic)) or CODE 622 (Intelligent Light System (right-hand traffic)) and CODE 608 (Adaptive Highbeam Assist))
- Vehicle moving forward
Function sequence for active light distribution (with CODE 621 (Intelligent Light System) (left-hand traffic) or CODE 622 (Intelligent Light System) (right-hand traffic) and CODE 608 (Adaptive Highbeam Assist))
The active light distribution encompasses the following subfunctions:
- Function sequence for motorway lights
- Function sequence for extended fog light
- Function sequence for adaptive high beams (with CODE 608 (Adaptive Highbeam Assist))
- Function sequence for off-road light distribution (Model 166.8 with CODE 430 (On & Offroad package))
The function sequences are described using a left-hand drive vehicle as an example.
Additional function requirements, freeway lights
- Function "Intell. Light System:" Activated in the "Lights" menu in the instrument cluster
- "Extended fog light" function disabled
- Radius of curve r ≥ 800 m
Function sequence for motorway lights
The freeway lights improve the illumination of the road by increasing the range of the low beams without blinding the preceding traffic. This function is achieved by means of vertically deflecting the light cone and increasing the light output. The freeway lights are activated at speeds typical for the freeway or expressway.
The motorway lights function is deactivated when it is raining. Rain detection takes place by evaluating the windshield wiper signal "windshield wiper not in park position". If the windshield wiper is in the park position less than t = 600 ms, this is evaluated as continuous wipe. Rain is detected if the continuous wipe function is active for t > 2 min.
Schematic of light distribution for active freeway lights function
The motorway lights function depends on the following control factors:
- Steering angle
- Vehicle speed
- Vehicle yaw behavior (vehicle movement)
The motorway lights function is enabled manually using the controls in the instrument cluster.
The instrument cluster sends the corresponding status over the interior CAN to the SAM control unit and over the chassis CAN 2 to the headlamp control unit.
The instrument cluster sends the vehicle speed over the chassis CAN 2 to the headlamp control unit.
The steering column tube module control unit sends the data of the steering wheel angle sensor and the Electronic Stability Program control unit sends information on the vehicle's movement via chassis CAN 1, electronic ignition lock control unit and chassis CAN 2 to the headlamp control unit.
As from a vehicle speed of v = 90 km/h, the light output of the left xenon bulb with integrated ignition module (E1e10) and the right xenon bulb with integrated ignition module (E2e10) is increased linearly up to P = 38 W. To this end, the headlamp control unit sends a request to increase the light output over the left headlamp LIN to the left xenon light power supply module (E1n4) and over the right headlamp LIN to the right xenon light power supply module (E2n4).
The headlamp control unit also actuates the light distribution actuator motors via the headlamp LIN starting at a speed of v > 110 km/h for a distance of more than s = 1 km.
The position of the covers that partially block the light cones of the xenon bulbs is changed accordingly. This releases a greater portion of the previously concealed light cone and the low beam range is increased accordingly. The maximum amount of light cone is achieved at v = 130 km/h. If the vehicle speed drops down to below v = 80 km/h, the "motorway lights" function is disabled.
Additional function requirements for extended fog light function
- Function "Intell. Light System:" Activated in the "Lights" menu in the instrument cluster
- Rear fog lights actuation active
Function sequence for extended fog light
The extended fog light function improves the illumination of the edges of the road and reduces the internal dazzling.
It is activated at speeds typical of urban traffic and rural roads.
The xenon bulb light cone in the front lamp unit facing the inside of the road is raised and swiveled outwards at vehicle speeds below v = 70 km/h.
Schematic of light distribution for active extended fog light function
The extended fog light function is enabled manually via the operation level in the instrument cluster.
The instrument cluster sends the corresponding status over the interior CAN to the SAM control unit and over the chassis CAN 2 to the headlamp control unit.
The instrument cluster sends the vehicle speed over the chassis CAN 2 to the headlamp control unit.
The SAM control unit directly reads in the status of the rear fog light button (S1s10) and sends it over the interior CAN, electronic ignition lock control unit and chassis CAN 2 to the headlamp control unit.
The headlamp control unit evaluates all relevant data and actuates the actuator motor for the left active curve light and the actuator motor for the left light distribution over the left headlamp LIN.
The headlamp unit of the left front lamp unit is swiveled outwards by approx. α = 8° and the part of the light-dark boundary that rises to the right is covered.
Internal dazzling is reduced and illumination of the road surface at the side is improved.
If the extended fog light function is active, the dynamic curve illumination function is deactivated.
If the high beams function is requested with active extended fog lights, the position of the headlamp unit is retained.
The extended fog light function is deactivated under the following conditions:
- Failure of a front lamp unit (low beam)
- Malfunctions of actuator motor for left active curve light or actuator motor for left light distribution
When testing and adjusting the front lamp unit, ensure that the extended fog light function is not active.
Additional function requirements for adaptive high beams (with CODE 608 (Adaptive Highbeam Assist))
- "Adaptive Highbeam Assist" function activated in "Lights" menu in the instrument cluster
- Combination switch in "High beams" position
- Exterior lights switch (S1) in position "AUTO"
- Vehicle speed v > 40 km/h
- Multifunction camera signals "Darkness detected"
Function sequence for adaptive high beams (with CODE 608 (Adaptive Highbeam Assist))
Adaptive high beams is an assist function.
The headlamp range of the xenon light is adapted to the distance of the nearest preceding or oncoming road user by actuating various actuators in the front lamp units.
If no road users are detected, the adaptive high beams function automatically activates the high beams.
The adaptive high beams function is enabled manually using the controls in the instrument cluster.
The instrument cluster transmits the corresponding status via interior CAN to the SAM control unit.
The steering column tube module control unit sends the switch position of the combination switch over the chassis CAN 1, electronic ignition lock control unit and interior CAN to the SAM control unit.
The SAM control unit reads in the status of the exterior lights switch directly.
The "Darkness detected" status is sent by the multifunction camera via chassis CAN 2, electronic ignition lock control unit and interior CAN to the SAM control unit.
After evaluating all the function requirements, the SAM control unit transmits the enable for the Adaptive high beams function via the interior CAN, the electronic ignition lock control unit and chassis CAN 2 to the multifunction camera and the headlamp control unit.
The activated adaptive high beams function is displayed by a symbol in the multifunction display (A1p13) in the instrument cluster. To this end, the SAM control unit sends the status "Enable automatic high beams" via interior CAN to the instrument cluster.
In order to implement the adaptive high beams function, the multifunction camera evaluates the following information about the vehicle's own movement, among other things:
- Steering wheel angle and steering wheel velocity
- Vehicle speed (wheel speed signals)
- Vehicle yaw behavior (vehicle movement)
The steering column tube module control unit sends the data of the steering wheel angle sensor and the Electronic Stability Program control unit sends information on the wheel speed as an indicator of vehicle speed and the vehicle's movement over the chassis CAN 1, electronic ignition lock control unit and chassis CAN 2 to the multifunction camera.
The traffic and environment situation in front of the vehicle is detected by the multifunction camera and accordingly evaluated.
Activation of the actuators installed in the front lamp units ensures the best possible illumination of the roadway without generating any dazzling effect for other road users.
The multifunction camera uses brightness, shape, structure, where applicable color and motion of the recorded objects to differentiate whether they are, e.g. road users in front or behind the vehicle, street lights or signs.
The picture recognition module integrated into the multifunction camera judges the distance to the 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.
A distinction is made between the following functions states:
- Optical headlamp range adjustment
- Automatic high beams
Optical headlamp range adjustment:
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" status via chassis CAN 2 to the headlamp control unit.
The headlamp control unit then actuates the light distribution actuator motors over the headlamp LIN.
The position of the covers, which partially block the light cones of the xenon bulbs, is changed accordingly, whereupon a part of the covered up light cone is then released.
The road surface is better illuminated without causing a dazzling effect for other road users.
The light cone of the xenon bulbs varies between s = 65 m (standard lighting) and s = 300 m.
If the vehicle speed drops below v = 40 km/h, the optical headlamp range adjustment is deactivated.
Automatic high beams:
The xenon bulb light cones are not fully released until vehicle speed is greater than v = 55 km/h and no other road users are detected. To do so, the headlamp control unit actuates the actuator motors for light distribution over the headlamp LIN.
The position of the panels which partially cover up the light cones of the xenon bulbs is changed accordingly, whereupon the entire light cone is then released.
The multifunction camera sends the request for this over the chassis CAN 2 to the headlamp control unit.
If vehicle speed drops below v = 45 km/h, the automatic high beams are deactivated.
The activation or deactivation speed of the automatic high beams is controlled adaptively by the multifunction camera.
As soon as the automatic high beams are activated, the high beams indicator lamp (A1e3) in the instrument cluster lights up. To this end, the SAM control unit sends the status "Enable automatic high beams" via interior CAN to the instrument cluster.
On roads with street lamps positioned regularly, the automatic high beams are deactivated.
Limits of the adaptive high beams:
In tight curves, the multifunction camera may not recognize oncoming vehicles or only do so very late due to the recording angle (∠= 35°).
The automatic high beams are therefore deactivated depending on the steering angle.
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. The automatic high beams are not switched off. 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 crests, oncoming vehicles are not recognized until late and the automatic high beams are therefore 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, 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.
Additional function requirements for off-road light distribution (Model 166.8 with CODE 430 (On & Offroad package))
- "Off-road light" function activated in "Light" menu in instrument cluster
- Off-road program 1 or 2 activated via off-road package transmission mode control (N72/3s1)
- Speed v < 50 km/h
Function sequence for off-road light distribution (Model 166.8 with CODE 430 (On & Offroad package))
The off-road light distribution improves the side illumination of the roadway and therefore orientation during off-road driving.
Through actuation of the light distribution actuator motors, the increasing part of the light-dark boundary is covered and thus a symmetrical light cone created. In addition, the headlamp units are swiveled outward by the actuation of the active curve light actuator motors and the cornering lights are switched on.
The off-road light function is manually enabled through the operation level in the instrument cluster.
The instrument cluster sends the corresponding status over the interior CAN to the SAM control unit and over the chassis CAN 2 to the headlamp control unit.
Selection of the off-road program via the off-road package transmission mode control is read in by the SAM control unit over the center console switch LIN (LIN B12) and this information is sent over the interior CAN, electronic ignition lock control unit and chassis CAN 2 to the headlamp control unit.
The instrument cluster sends the vehicle speed over the chassis CAN 2 to the headlamp control unit.
The headlamp control unit reads in all relevant information, evaluates this and sends the request "Cornering lights ON" via headlamp LIN to the front actuation modules, LED exterior lighting, which then switch on the cornering lights. The headlamp control unit also actuates the light distribution actuator motors and the active curve lights actuator motors, in each case via headlamp LIN.
At speeds of v > 50 km/h, the headlamp control unit deactivates the off-road light distribution.
The headlamp control unit only switches on the off-road light distribution again if the speed threshold of v = 45 km/h is fallen below.
| Electrical function schematic, additional functions, driving lights actuation | PE82.10-P-2063-97NAA | ||
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