Function Of Intelligent Light System - GF82.10-S-3090TRF
Model 447
with code LG2 (LED Intelligent Light System)
with code XM0 (Facelift)
except code XM7 (MOPF II)
Shown on model 447.6/7
Illustration shows Model 447.8
Function requirements, general
- No overvoltage or undervoltage
- Transport mode not activated
- "Engine running" signal.
- Low beam "ON"
- The "Intelligent Light System" function is activated via the "Settings" menu in the "Light" submenu in the instrument cluster (IC [KI]) control unit (A1/1) The powertrain control unit (N127) sends the "Engine running" signal to the left headlamp control unit (E1/1n9).
The signal acquisition and actuation module (SAM) control unit (N10/1) reads in the status of the illumination switch directly and sends the "Low beam ON" request to the left headlamp control unit.
The "Intelligent Light System" function is selected and switched on or off manually via the control level in the instrument cluster (IC) control unit. This sends the corresponding status to the left headlamp control unit.
The left headlamp control unit acts as the master and synchronizes the right headlamp control unit (E2/1n9) via the front end CAN (CAN G).
LED Intelligent Light System, general
The LED Intelligent Light System function enables optimum illumination of the road to be achieved during different driving situations and weather conditions. This takes place by increasing the light output and by actuating additional light sources and various actuators in the left front LED lamp unit (E1/1) and the right front LED lamp unit (E2/1) in a targeted manner.
The LED Intelligent Light System function encompasses the following subfunctions:
- Cornering lights function sequence
- Function sequence, dynamic curve illumination
- Function sequence for active light distribution
- Function sequence for high beam assist PLUS (with code LG8 (High beam assist PLUS))
Additional function prerequisites for cornering lights
- Turn signaling active and speed < 60 km/h or steering angle detected and speed < 70 km/h
- Radius of curve < 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 angle, recorded by the steering wheel angle sensor in the steering column tube module (MRM) control unit (N80), and the turn signaling function, defined by the switch position of the combination switch (S4).
The vehicle speed influences the actuation characteristic for cornering lights actuation. At slow speed, a lower switch-on point 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 (MRM) control unit reads in the data of the steering wheel angle sensor and the switch position of the combination switch directly and sends it to the left headlamp control unit.
The vehicle speed is calculated on the basis of the wheel speeds. To do so, the Electronic Stability Program (ESP) control unit (N30/4) sends the wheel speed signals to the left headlamp control unit.
The left headlamp control unit evaluates all information and directly actuates the left cornering light (E1/1e9) if necessary.
The left headlamp control unit synchronizes the right headlamp control unit. The right headlamp control unit actuates the right cornering light (E2/1e9) directly if necessary.
The cornering light on the inside of the curve is actuated during forward travel, and the cornering light on the outside of the curve is actuated when reversing. When backing up in the dark, both turn signal lamps are actuated. If there is a rapid change in the steering movement or in the turn signaling request, both cornering lights may light up 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 40 km/h compared with the request by the detection of the steering angle. This means that when the steering wheel is turned and the turning direction is in the opposite direction, illumination of the inner curve of the outer edge of the roadway is guaranteed (on 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 automatic transmission
The gear range R request is defined by the corresponding selector lever position. The fully integrated transmission control (VGS) electric controller unit transmits the selector lever position to the electronic ignition lock (EZS) control unit (N73).
- Vehicles with code G42 (7G-TRONIC PLUS): Fully integrated transmission control (VGS) electric controller unit (N15/11)
- Vehicles with code G43 (9G-TRONIC): Fully integrated transmission control (VGS) electric controller unit (N15/15)
- Vehicles with manual transmission
The reversing lamp switch (S16/2) sends the "reverse gear engaged" signal via a direct line to the signal acquisition and actuation module (SAM). This transmits the signal onward via the interior CAN (CAN B), the electronic ignition lock (EZS) control unit and the front end CAN to the left headlamp control unit.
If the cornering lights function is requested simultaneously by the detected steering angle and the turn signaling function, the actuation sensitivity is increased. The corresponding cornering light is actuated as soon as a curve radius of less than 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 2 s and is switched off within 2 s with dimming.
Additional function requirements for dynamic curve illumination
- Vehicle moving forward
- Extended fog light function disabled
Function sequence, dynamic curve illumination
Dynamic curve illumination improves the road illumination when cornering For this the low beam light cone (A) for the long range is swiveled horizontally towards the center point of the curve
The low beam modules in the front LED lamp units are mounted in a retaining frame and can be swiveled. As a result, the low beam light cone (A) for the long range can move horizontally as well as vertically. When turning into a curve, the low beam module of the front LED lamp unit on the inside of the curve is swiveled up to 15°, and the front LED lamp unit on the outside of the curve up to 7.5°.
Schematic of light distribution for active dynamic curve illumination function
The dynamic curve illumination function depends on the following control variables:
- Steering wheel angle
- Vehicle speed
- Vehicle yaw behavior (vehicle movement)
The steering angle is the direct input parameter The vehicle speed influences the control response of the function (ratio of steering 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 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 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 (steering angle of approx. 6°).
The steering column tube module (MRM) control unit reads in the data of the steering wheel angle sensor directly and sends this data to the left headlamp control unit.
The vehicle speed is calculated on the basis of the wheel speeds. To do so, the Electronic Stability Program (ESP) control unit sends the wheel speed signals to the left headlamp control unit.
The yaw behavior of the vehicle is recorded by the acceleration sensor integrated in the supplemental restraint system (SRS) control unit (N2/18). The Supplemental Restraint System (SRS) control unit sends corresponding information to the left headlamp control unit.
The left headlamp control unit evaluates all relevant information and actuates the left active curve lights actuator motor (E1/1m2) if necessary.
The left headlamp control unit synchronizes the right headlamp control unit via the front end CAN The right headlamp control unit then actuates the right active curve lights actuator motor (E2/1 m2) if necessary.
The current position of the active curve lights actuator motors is reported back to the corresponding headlamp control unit To this end the left headlamp control unit directly reads in the signals from the left active curve light position sensor (E1/1b1) while the right headlamp control unit directly reads in the signals from the right active curve light position sensor (E2/1b1).
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 fails the part of the light/dark boundary that slopes upward is covered up through actuation of the left light distribution actuator motor (E1/1m3) or the right light distribution actuator motor (E2/1m3). This reduces the dazzling effect for oncoming traffic.
Additional function requirements, active light distribution
- Vehicle moving forward
Function sequence for active light distribution
The active light distribution encompasses the following subfunctions:
- Function sequence for motorway lights
- Function sequence for extended fog light
This function is realized by means of vertically deflecting the low beam light cone (A) and increasing the light output. Highway mode is activated at speeds typical for the freeway and expressway.
Additional function requirements, freeway lights
- Extended fog light function disabled
- Curve radius > 800 m
Function sequence for motorway lights
The motorway lights improve the illumination of the road by increasing the low beam light cone (A) without dazzling the traffic ahead.
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 600 ms, this is evaluated as continuous wiping. Rain is detected if the continuous wiping function is active for 2 min. The signal acquisition and actuation module (SAM) control unit controls the windshield wiper system.
Schematic of light distribution for active freeway lights function
The freeway lights function depends on the following control factors:
- Steering wheel angle
- Vehicle speed
- Vehicle yaw behavior (vehicle movement)
The steering column tube module (MRM) control unit reads in the data of the steering wheel angle sensor directly and sends this data to the left headlamp control unit.
The vehicle speed is calculated on the basis of the wheel speeds. To do so, the Electronic Stability Program (ESP) control unit sends the wheel speed signals to the left headlamp control unit.
The yaw behavior of the vehicle is recorded by the acceleration sensor integrated in the supplemental restraint system (SRS) control unit. The Supplemental Restraint System (SRS) control unit sends corresponding information to the left headlamp control unit. The left headlamp control unit synchronizes the right headlamp control unit.
From a vehicle speed of 90 km/h and a curve radius of > 800 m for a driving distance greater than 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 "Increase light output" request via the left headlamp LIN (LIN G1) to the left front LED exterior lighting actuation module (E1/1n7).
The right headlamp control unit transmits the "Increase light output" request via the right headlamp LIN (LIN G2) to the right front LED exterior lighting actuation module (E2/1n7).
The left headlamp control unit additionally actuates the left headlamp range control actuator motor (E1/1m1) from a speed of > 110 km/h and a curve radius of > 800 m for a driving distance of more than 1 km, and also actuates the right headlamp range control actuator motor (E2/1m1) via the right headlamp control unit. The headlamp unit of the left front LED lamp unit is raised. The range of the low beams is thus increased. The maximum lift is reached as of 130 km/h. If the vehicle speed drops down to below 80 km/h, the highway mode function is disabled.
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 low beam module in the front LED lamp unit on the inside of the road is swiveled outward at speeds of < 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 do so, the Electronic Stability Program (ESP) control unit sends the wheel speed signals 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 beam module in the left front LED lamp unit is swiveled outward by 8° and the part of the light/dark boundary that slopes upward to the right is covered up.
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 beam function is requested while the enhanced fog light function is active, the position of the headlamp unit remains unchanged.
The left parking/standing/daytime running light (E1/1e13) and the right parking/standing/daytime running light (E2/1e13) are switched off to prevent possible reflective glare.
The extended fog light function is deactivated under the following conditions:
- Failure of a front LED lamp unit (low beams)
- Actuator motor malfunction
The extended fog light function must not be active when the front LED lamp units are being tested and adjusted.
Additional function requirements for high beam assist PLUS (with code LG8 (High beam assist PLUS))
- Vehicle moving forward
- Speed ≥ 45 km/h
- Automatic high beam function activated
Function sequence for high beam assist PLUS (with code LG8 (High beam assist PLUS))
If other road users are detected when the automatic high beam function is active, the multifunction camera (MFK) control unit (B84/8) activates the high beam assist PLUS function.
High beam assist PLUS controls the light distribution of the low beam, the partial high beam and the high beam in the manner permitted by the traffic situation.
The road users are kept out of the light cone and therefore not dazzled as far as possible. If the system detects oncoming vehicles or vehicles in front, it continuously adapts the headlamp range to the distance so that the headlight cone ends in front of the vehicles.
Schematic of light distribution for active high beam assist PLUS function
The signal acquisition and actuation module (SAM) control unit sends the "High beam ON" status via the interior CAN to the instrument cluster (IC), which then actuates the high beam indicator lamp (A1/1e3).
The multifunction camera (MFK) control unit sends the "Light output setting" and "Rotation angle setting" request via the front end CAN to the left headlamp control unit and the right headlamp control unit depending on the distance of the vehicle to other road users and the geometry of the road (differences in height, angle).
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 LED exterior lighting actuation module. This increases the light output of the left low beam (long range) (E1/1e16).
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 LED exterior lighting actuation module. This increases the light output of the right low beam (long range) (E2/1e16).
| Overview of exterior lights system components | GF82.10-S-9998TRF |