GF82.10-P-3050GMB Additional Functions For Driving Lights Actuation, Function
GF82.10-P-3050GMB Additional Functions For Driving Lights Actuation, Function
- with CODE (615) Bi-xenon headlamp unit with integrated curve illumination
- with CODE (616) Bi-xenon headlamp unit with intergrated asymmetrical curve illumination
- with CODE (621) Intelligent Light System (left-hand traffic)
- with CODE (622) Intelligent Light System (right-hand traffic)
Function requirements for additional functions of driving lights actuation, general
^ No overvoltage or undervoltage (operating voltage range U ≥7 ≤17.5 V)
^ Low beam ON
^ Engine running (circuit 61 ON) n > 300 rpm
The circuit status of circuit 61 is provided on the engine compartment CAN (CAN C) by the CDI control unit (N3/9) (with diesel engine) or the ME-SFI [ME] control unit (N3/10) (with gasoline engine) and forwarded by the central gateway control unit (N93) via the interior CAN (CAN B) to the front 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 takes place by selectively actuating additional light sources and various actuators in the left front lamp unit (E1) or in the right front lamp unit (E2).
During actuation of the driving lights actuation additional function, the low beam actuation is active; it is described in a separate document.
The additional functions of driving lights actuation are comprised of the following subfunctions:
^ Cornering lights function sequence
(model 164.1, model 164.8 up to 30.6.09, model 251)
^ Function sequence, dynamic curve illumination
^ Active light distribution function sequence
(model 164.8 as of 1.7.09 with code (621) Intelligent Light System (left-hand traffic) or code (622) Intelligent Light System (right-hand traffic))
Additional function requirements, cornering illumination
^ Turn signaling active and speed v < 45 km/h
(except code (460) Canada version or code (494) USA version) or v < 60 km/h (with code (460) Canada version or code (494) USA version) or steering angle detected and speed v < 70 km/h
^ Radius of curve r ≤ 500 m
Cornering lights function sequence
The cornering lights function enables better illumination of the roadway in the cornering direction and is implemented by actuating the left front fog lamp (E5/1) or the right front fog lamp (E5/2).
The direct input factors of the cornering lights function are the steering wheel angle, recorded by the steering angle sensor (N49), and the turn signaling function, defined by the switch position of the combination switch (S4), since they describe the driver's direction requirement. The vehicle speed influences the system behavior of the turning light actuation. At a low vehicle speed, a low switch-on point is required for the cornering illumination to be activated early on in urban traffic.
The data from the steering angle sensor and the position of the combination switch are read in by the steering column tube module (N80) and provided on the engine compartment CAN. The central gateway control unit forwards this via the interior CAN to the front SAM control unit.
The instrument cluster (A1) transmits the vehicle speed information to the front SAM control unit via the interior CAN.
The front SAM control unit reads in all of the relevant information, evaluates it and actuates the left front fog lamp or the right front fog lamp pulsed based on the request.
Only one front fog lamp is actuated - the fog lamp on the inside of the curve when driving forwards and the fog lamp on the outside of the curve when reversing. The corresponding front fog lamp 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 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 angle sensor is evaluated.
If the cornering lights function is requested simultaneously by the detected steering wheel angle and the turn signaling function, the system sensitivity is reduced. The relevant front fog lamp is actuated even with a curve radius of r ≤500m.
If the function request suddenly no longer applies, the relevant front fog lamp remains switched on for a holding time of approx. t = 3 s and is switched off within t = 2 s with dimming.
If there is a rapid change in the steering wheel angle or in the turn signaling request, both front fog lamps may illuminate briefly. During reverse travel, both front fog lamps are actuated, provided that the "Parking illumination Max." function was selected via the instrument cluster.
Additional function requirements, dynamic curve illumination
^ Vehicle moving forward
^ Low beam ON
^ "Extended fog light" function deactivated
(model 164.8 as of 1.7.09 with code (621) Intelligent Light System (left-hand traffic) or code (622) Intelligent Light System (right-hand traffic))
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. A conventional bi-xenon headlamp serves as a basis, the headlamp unit of which is supported in a retaining frame so that it can swivel. When steering into a curve the headlamp unit on the inside of the curve is swiveled up to Alpha = 15°, the headlamp unit on the outside of the curve up to Alpha = 7.5°.
The dynamic curve light actuation function depends on the following controlled variables:
- Steering wheel angle
- Vehicle speed
- Yaw response of the vehicle
The steering wheel angle is the direct input parameter. The vehicle speed influences the system's control response (ratio of steering angle to swivel angle).
At a low vehicle speed a lower transformation is required so that the light pattern does not behave in a jumpy manner, in urban traffic for example.
At medium speeds direct reactions take place to relatively small steering wheel angle changes and at higher speeds the system reactions are increasingly damped again. In order to adjust for natural weaving of the vehicle when driving straight ahead, an area with lower sensitivity and increased damping is planned.
The steering wheel angle recorded via the steering angle sensor is provided on the engine compartment CAN by the steering column tube module.
Information about wheel speeds and wheel rotation directions as an indicator for the vehicle speed and the yaw response of the vehicle is provided by the ESP control unit (N47-5), also on the engine compartment CAN. The yaw response of the vehicle is recorded by the yaw rate sensor for lateral and longitudinal acceleration (B24/15). This transmits appropriate data to the ESP control unit via the vehicle dynamics CAN (CAN H).
Model 164:
The xenon headlamp control unit (E1n1) at the left front lamp unit and the xenon headlamp control unit (E2n1) at the right front lamp unit read in all relevant information via the engine compartment CAN and evaluate it.
In accordance with the request, the xenon headlamp control unit at the left front lamp unit actuates the left dynamic curve illumination motor (E1m2) and the xenon headlamp control unit at the right front lamp unit actuates the right dynamic curve illumination motor (E2m2).
The current position of the dynamic curve illumination motors and faults occurring, such as short circuits or discontinuities, are reported back to the corresponding xenon headlamp control unit.
With model 164.8 as of 1.7.09 with code (621) Intelligent Light System (left-hand traffic) or code (622) Intelligent Light System (right-hand traffic) the dynamic curve illumination motors are actuated via the respective headlamp-internal local interconnect network (LIN).
Model 251:
The headlamp range adjustment control unit (N71) reads in all relevant information via the engine compartment CAN, evaluates it and actuates the HRA [LWR] power module (E1n3) at the left front lamp unit or the HRA [LWR] power module (E2n3) at the right front lamp unit.
The HRA [LWR] power module at the left front lamp unit actuates the left dynamic curve illumination motor accordingly. The HRA [LWR] power module at the right front lamp unit actuates the right dynamic curve illumination motor accordingly.
If the dynamic curve illumination function is defective, low beam actuation is disabled.
Additional function requirements for active light distribution (model 164.8 as of 1.7.09 with code (621) Intelligent Light System (left-hand traffic) or code (622) Intelligent Light System (right-hand traffic))
^ Vehicle moving forward
Function sequence for active light distribution
The active light distribution is comprised of the following subfunctions:
^ Motorway lights function sequence
^ Extended fog light function sequence
Additional function requirements, freeway lights
^ Function activated via the instrument cluster
^ Extended fog light function inactive
^ Radius of curve r ≥800 m
Motorway lights function sequence
The freeway lights enable optimum illumination of the roadway at high vehicle speeds.
This is achieved by increasing the light output and vertically deflecting the low beam cone.
The freeway 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 for less than t = 600 ms, this is evaluated as continuous wiping. Rain is detected if the continuous wipe function is active for t > 2 min.
The freeway lights function depends on the following set variables:
- Steering wheel angle
- Vehicle speed
- Yaw response of the vehicle
The release of the freeway lights function takes place manually via the operation level in the instrument cluster.
The instrument cluster transmits the relevant status via the engine compartment CAN to the xenon headlamp control units.
The data of the steering angle sensor is read in by the steering column tube module and made available on the engine compartment CAN.
Information on wheel speed and wheel rotation direction, as an indicator for the vehicle speed and the yaw response of the vehicle, is made available on the engine compartment CAN by the ESP control unit. If necessary, the vehicle speed calculated by the instrument cluster is used as a substitute value. The yaw response of the vehicle is recorded by the yaw rate sensor for lateral and longitudinal acceleration.
This transmits appropriate data to the ESP control unit via the vehicle dynamics CAN. The xenon headlamp control units read in all of the relevant information via engine compartment CAN and evaluate this accordingly.
Starting at a vehicle speed of v = 70 km/h, the light output of the left bi-xenon light with integrated ignition module (E1e10) and the right bi-xenon light with integrated ignition module (E2e10) is increased linearly up to P = 38 W by the corresponding xenon headlamp control unit.
Under the following conditions, the left light distribution cylinder motor (E1m3) and the right light distribution cylinder motor (E2m3) are also actuated via the relevant headlamp-internal LIN to release part of the covered low beam cone of the xenon lamps, which increases the range of the low beams:
- v > 110 km/h for a distance of more than s = 1 km or
- v > 130 km/h
If the vehicle speed drops down to below v = 80 km/h, the "freeway lights" function is disabled.
Additional function requirements, extended fog light function
^ Function activated via the instrument cluster
^ Rear fog lights actuation active
Function sequence for extended fog light function (for right-hand traffic)
The extended fog light function is enabled manually via the operation level in the instrument cluster. The instrument cluster transmits the relevant status via the engine compartment CAN to the xenon headlamp control units.
The upper control panel control unit (N72/1) reads in the status of the rotary light switch (S1) via the instrument panel LIN (LIN 1) and transmits it via the interior CAN to the front SAM control unit. The front SAM control unit then transmits the "switch on rear fog light" request. This request is relayed to the xenon headlamp control units by the central gateway control unit via the engine compartment CAN.
At a vehicle speed of less than v = 70 km/h the left xenon headlamp control unit actuates the left light distribution cylinder motor and the dynamic curve illumination motor in the left front lamp unit via the headlamp-internal LIN.
The headlamp unit of the left front lamp unit is swiveled outwards by Alpha = 8° and the part of the light-dark boundary that slopes to the right is covered. This in turn serves to reduce internal dazzling and the side illumination of the travel lane is improved.
If the "extended fog light function" is active the "dynamic curve illumination" function is switched off. If the high beams function is requested during active "extended fog lights", the position of the headlamp unit is retained.
