Function Of Intelligent Light System - GF82.10-P-3090RF
Model 205
up to model year 2019
with code 640 (High-performance LED)
Model 205
up to model year 2019
with code 641 (Dynamic LED headlamps, left-hand traffic)
Model 205
up to model year 2019
with code 642 (Dynamic LED headlamps, right-hand traffic)
Model 253 (except 253.99)
up to model year 2020
with code 640 (High-performance LED)
Model 253 (except 253.99)
up to model year 2020
with code 641 (Dynamic LED headlamps, left-hand traffic)
Model 253 (except 253.99)
up to model year 2020
with code 642 (Dynamic LED headlamps, right-hand traffic)
Function requirements, general
- No overvoltage or undervoltage
- Transport mode not activated
- "Engine running" or "drivetrain operational" signal on
- Low beam ON
Low beams actuation is active while the individual functions are being executed.
- "Intelligent Light System" function activated via "Settings" menu in the "Light" submenu in the instrument cluster (A1)
The "Engine running" or "Drivetrain operational" status is transmitted by the CDI control unit (N3/9) (diesel engine) or the ME-SFI [ME] control unit (N3/10) (gasoline engine) via drivetrain CAN (CAN C1), powertrain control unit (N127), chassis FlexRay (Flex E), electronic ignition lock control unit (N73) and peripherals CAN (CAN PER) to the left headlamp control unit (E1n9) on the left front lamp unit (E1) and to the right headlamp control unit (E2n9) on the right front lamp unit (E2).
The "Intelligent Light System" function is selected and switched on or off manually via the instrument cluster's control level. The instrument cluster sends the corresponding status via user interface CAN (CAN HMI), electronic ignition switch control unit and periphery CAN to the headlamp control units.
Intelligent Light System, general
The Intelligent Light System function enables optimum illumination of the road to be achieved during different driving situations and weather conditions. This is achieved by increasing light output and through targeted actuation of additional light sources along with various actuators in the front lamp units.
The Intelligent Light System function encompasses the following subfunctions:
- Cornering lights function sequence
- Active curve lights, function sequence
- Function sequence for active light distribution (with CODE 641 (Dynamic left-hand traffic LED headlamp) or CODE 642 (Dynamic right-hand traffic LED headlamp))
Additional function prerequisites for cornering lights
- Turn signaling active and speed v < 40 km/h or steering movements detected and speed v < 70 km/h
- Radius of curve r ≤ 500 m
Cornering lights function sequence
The cornering lights improve the illumination of the edge of the road on the inside of the curve.
The direct input factors of the cornering lights actuation are the steering movement, 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 slow speed, a lower switch-on threshold is required to ensure that the cornering lights can be activated early in urban traffic.
Schematic of light distribution for active cornering lights actuation
The steering column tube module control unit (N80) directly reads in the signals of the steering wheel angle sensor and the switch position of the combination switch and sends information on the steering angle and the switch position of the combination switch via chassis FlexRay, electronic ignition lock control unit and periphery CAN to the left headlamp control unit.
The vehicle speed is calculated on the basis of the wheel speeds. To this end, the Electronic Stability Program control unit (N30/4) sends the wheel speed signals via chassis FlexRay, electronic ignition switch control unit and peripherals CAN to the left headlamp control unit. The left headlamp control unit evaluates all the information and, if necessary, actuates the left cornering light (E1e9). The right headlamp control unit actuates the right cornering light (E2e9), if necessary. The headlamp control units operate in a in master-slave combination, whereby the left headlamp control unit acts as the master and synchronizes the right headlamp control unit via peripherals CAN. 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 there is a rapid change in the steering movement or in the turn signaling request, both cornering lights 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 compared with the request by the detection of the steering 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.
The "reverse gear engaged" status is defined as follows:
- Vehicles with transmission 716:
Engaging the reverse gear is recorded by the manual transmission main shifter shaft position sensor (B79/3). The CDI control unit (diesel engine) or the ME-SFI [ME] control unit (gasoline engine) reads in the signal of the manual transmission main shifter shaft position sensor directly, generates the "Reverse gear engaged" signal and transmits this via the drivetrain CAN, the powertrain control unit and the chassis FlexRay to the electronic ignition lock control unit.
- Vehicles with transmission 722, 724, 725:
Gear range "R" is engaged by the fully integrated transmission control unit (Y3/8n4). The fully integrated transmission control unit then sends the "Gear range R engaged" status to the electronic ignition switch control unit over the drivetrain CAN, powertrain control unit and chassis FlexRay.
The electronic ignition switch control unit uses the incoming information to generate the signal "Reverse gear engaged" that is independent of the transmission variant and sends it over the periphery CAN to the left headlamp control unit.
If the cornering lights function is requested at the same time as the turn signaling function through the detected steering wheel movement, then the actuation behavior is modified. The corresponding cornering light is actuated as soon as a curve radius of r ≤ 500 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, active curve illumination
- Vehicle moving forward
- Extended fog light function disabled
Active curve lights, function sequence
Active curve illumination improves the road illumination when cornering. To do this, the low beam cone for the long range is swiveled horizontally towards the center point of the curve.
The low beams modules in the front lamp units are mounted in retaining frames so that they are movable. As a result, the low beams cone for the long range can be moved both horizontally and vertically. When turning into a curve, the low beam module of the front lamp unit on the inside of the curve is swiveled up to α = 15°, and the front lamp unit on the outside of the curve up to α = 7.5°.
Schematic diagram of light distribution for active function of active curve lights
The active curve lights function is carried out depending on the following set variables:
- Steering angle
- Vehicle speed
- Vehicle yaw behavior (vehicle movement)
The direct input factor is the steering angle, the vehicle speed influences the control response of the function (transformation of steering angle into 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 vehicle speeds an immediate response is given to relatively minor changes in the steering angle and at higher vehicle speeds the responses are dampened again to a greater extent. A range with lower sensitivity and greater damping is provided (approx. ±6° steering angle) to compensate for the natural weaving of the vehicle when traveling straight ahead.
The steering column tube module control unit reads in the signals of the steering wheel angle sensor directly and sends information on the steering angle via chassis FlexRay, electronic ignition lock control unit and peripherals CAN to the left headlamp control unit.
The vehicle speed is calculated on the basis of the wheel speeds. To this end, the Electronic Stability Program control unit sends the wheel speed signals via chassis FlexRay, electronic ignition switch control unit and peripherals CAN to the left headlamp control unit.
The yaw behavior of the vehicle is recorded by the acceleration sensor integrated in the Supplemental Restraint System control unit (N2/10). The supplemental restraint system control unit sends corresponding information via vehicle dynamics CAN (CAN H), Electronic Stability Program control unit, chassis FlexRay, electronic ignition switch control unit and peripherals CAN to the left headlamp control unit. The left headlamp control unit evaluates all relevant information, synchronizes the right headlamp control unit over the periphery CAN and actuates the left active curve lights actuator motor (E1m2) if necessary.
The right headlamp control unit actuates the right active curve light actuator motor (E2m2), if necessary.
The current position of the left active curve light actuator motor is detected by the left active curve light position sensor (E1b1) and the position of the right active curve light actuator motor is detected by the right active curve light position sensor (E2b1). The signals of the active curve lights position sensors are evaluated by the respective headlamp control unit.
If the curve illumination actuation is defective, the low beams modules are, if possible, swiveled into the central position. If an active curve lights actuator motor malfunctions, the rising part of the light-dark boundary is covered up by actuating the left light distribution actuator motor (E1m3) or the right light distribution actuator motor (E2m3). This reduces the dazzling effect for oncoming traffic.
Additional function requirement for active light distribution (with CODE 641 (Dynamic left-hand traffic LED headlamp) or CODE 642 (Dynamic right-hand traffic LED headlamp))
- Vehicle moving forward
Function sequence for active light distribution (with CODE 641 (Dynamic left-hand traffic LED headlamp) or CODE 642 (Dynamic right-hand traffic LED headlamp))
The active light distribution encompasses the following subfunctions:
- Function sequence for motorway lights
- Function sequence for extended fog light
Additional function requirements, freeway lights
- 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 is detected by evaluating the "Windshield wiper out of park position" signal. 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. The front SAM control unit (N10/6) actuates the windshield wiper system.
Schematic of light distribution for active freeway lights function
The freeway lights function depends on the following control factors:
- Steering angle
- Vehicle speed
- Vehicle yaw behavior (vehicle movement)
The steering column tube module control unit reads in the signals of the steering wheel angle sensor and the switch position of the combination switch directly and transmits information about the steering angle and the switch position of the combination switch via the chassis FlexRay, the electronic ignition lock control unit and the periphery CAN to the left headlamp control unit.
The vehicle speed is calculated on the basis of the wheel speeds. To this end, the Electronic Stability Program control unit sends the wheel speed signals via chassis FlexRay, electronic ignition switch control unit and peripherals CAN to the left headlamp control unit.
The yaw behavior of the vehicle is recorded by the acceleration sensor integrated in the Supplemental Restraint System control unit. The supplemental restraint system control unit sends corresponding information via vehicle dynamics CAN, Electronic Stability Program control unit, chassis FlexRay, electronic ignition switch control unit and peripherals CAN to the left headlamp control unit. The left headlamp control unit synchronizes the right headlamp control unit via periphery CAN.
As of a vehicle speed of v = 90 km/h and a curve radius of r > 800 m for a driving distance greater than s = 2.5 km, the light output of the low beams for the long range is increased.
To do this, the left headlamp control unit transmits the request "Increase light output" via left headlamp LIN (LIN G1) to the left front actuation module, LED exterior lighting (E1n7). The left front actuation module, LED exterior lighting actuates the left low beam (long range) (E1e16) with greater power.
The right headlamp control unit transmits the request "Increase light output" via right headlamp LIN (LIN G2) to the right front actuation module, LED exterior lighting (E2n7). The right front actuation module, LED exterior lighting actuates the right low beam (long range) (E2e16) with greater power.
The left headlamp control unit as from a speed of v = 110 km/h and a curve radius of r > 800 m for more than s = 1 km driving distance, actuates the left headlamp range adjustment actuator motor (E1m1). The headlamp unit of the left front lamp unit is raised. The range of the low beams is thus increased. The maximum lift is reached 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
- Rear fog lights actuation active
The front SAM control unit reads in the status of the rear fog light button (S1s10) in the exterior lights switch (S1) direct and transmits the request "Rear fog light On" via interior CAN (CAN B), electronic ignition switch control unit and peripherals CAN to the left headlamp control unit.
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.
The light cone of the front lamp unit facing the inside of the road is raised and swiveled outwards at speeds below v = 70 km/h.
Schematic of light distribution for active extended fog light function
The vehicle speed is calculated on the basis of the wheel speeds. To this end, the Electronic Stability Program control unit sends the wheel speed signals via chassis FlexRay, electronic ignition switch control unit and peripherals CAN to the left headlamp control unit.
The left headlamp control unit evaluates all of the relevant information and actuates the left light distribution actuator motor and the left active curve lights actuator motor. The low beams module of the left front lamp unit is swiveled outwards by a = 8° and the part rising to the right of the light-dark boundary is covered up. Internal dazzling is reduced and illumination of the road surface at the side is improved.
The current position of the left active curve light actuator motor is detected by the left active curve light position sensor and the position of the left light distribution actuator motor is detected by the left light distribution position sensor (E1b2). The signals of the position sensors are evaluated by the left headlamp control unit.
If the extended fog light function is active, the active curve lights and cornering lights functions are deactivated. If the high beams function is requested while the "Extended fog light function" is active, the position of the headlamp unit is retained.
The extended fog light function is deactivated under the following conditions:
- Failure of a lamp unit (low beam)
- Actuator motor malfunction
When testing and adjusting the front lamp unit, ensure that the extended fog light function is not active.
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