GF82.10-P-3050RI Additional Functions For Driving Lights Actuation, Function

GF82.10-P-3050RI Additional Functions For Driving Lights Actuation, Function

Function requirements for additional functions of driving lights actuation, general
^ Low beam ON
^ Engine running (circuit 61 ON) n > 300 rpm

Additional functions, driving lights actuation, general
The additional functions of driving lights actuation enable optimum road illumination for different road and weather conditions.
This takes place by increasing the light output, selectively actuating additional light sources and various actuators in the left front lamp unit (E1) or in the right front lamp unit (E2).

The driving lights actuation is active during the actuation of additional functions of driving lights actuation.

The driving lights actuation is described in a separate document.

The additional functions of driving lights actuation are comprised of the following subfunctions:
^ Cornering illumination function sequence
^ Function sequence for dynamic curve illumination
(for code (621) Intelligent Light System (left-hand traffic) or code (622) Intelligent Light System (right-hand traffic))
^ Function sequence for active light distribution
(for code (621) Intelligent Light System (left-hand traffic) or code (622) Intelligent Light System (right-hand traffic))

Cornering illumination function sequence
The cornering illumination function is comprised of the following subfunctions:
^ Cornering illumination function sequence
^ Function sequence for static curve illumination
^ Function sequence for cornering illumination and static curve illumination

Additional function requirements, cornering illumination
^ Turn signaling active and speed v < 40 km/h
(without code (494) USA version) or
^ Speed v < 60 km/h
(for code (494) USA version) or
^ Steering angle detected and speed v < 70 km/h

Cornering illumination function sequence
The direct input factors are the steering wheel angle, recorded by the steering angle sensor (N49), the turn signaling function, defined by the switch position of the combination switch (S4), because they describe the direction requirement of the driver.

The vehicle speed influences the system behavior of the turning light actuation. At a slower vehicle speed a lower switch-on point is required to ensure that the cornering illumination actuation can be activated early in urban traffic. The data from the steering angle sensor and the status of the combination switch are read in by the steering column tube module (N80) and made available on the engine compartment CAN.
Information on wheel speed and wheel rotation direction is made available by the ESP, SPS [PML] and BAS control unit (N47-5) also on the engine compartment CAN.
All relevant information is forwarded by the central gateway control unit (N93) to the xenon headlamp control unit (E1n1) at the left front lamp unit (E1) via the diagnostic CAN. The xenon headlamp control unit at the left front lamp unit evaluates all the incoming data and as master synchronizes the xenon headlamp control unit (E2n1) at the right front lamp unit (E2).

Based on the request, the xenon headlamp control unit at the left front lamp unit actuates the left cornering illumination (E1e9) and the xenon headlamp control unit at the right front lamp unit actuates the right cornering illumination (E2e9), pulsed in each case.
Only one cornering light is actuated: the inside corner light during forward travel and the outside corner light during reverse travel. 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 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).
Only the data of the steering angle sensor is evaluated when gear range R is engaged.

If the function request suddenly disappears, the corresponding cornering light remains switched on for a holding time of approx. t = 2 s and is switched off with dimming within t = 2 s.

If there is a rapid change in the steering wheel angle or in the turn signaling request, both cornering lights may light up briefly.

Additional function requirements, static curve illumination
^ Simultaneous request for the cornering illumination function due to detected steering wheel angle and the turn signaling function

Function sequence for static curve illumination
The function sequence and the signal flow for the static curve illumination function are almost identical to that for the cornering illumination function.
The system sensitivity of the cornering illumination function is increased due to the additional request of the turn signaling function The corresponding cornering light is actuated even when a curve radius of r ≤500m is detected.

Function sequence for cornering illumination and static curve illumination
The cornering illumination and static curve illumination function merely represents a combination of the cornering illumination and static curve illumination functions. The function sequence and the signal flow for the cornering illumination and static curve illumination function correspond to that for the static curve illumination function.

Additional function requirements, dynamic curve illumination
^ Function activated via the instrument cluster (A1)
^ 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 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 15°, the headlamp unit on the outside of the curve up to 7.5°.

Dynamic curve illumination actuation depends on the following set variables:
- Steering wheel angle
- Vehicle speed
- Yaw response of the vehicle

The direct input factor is the steering wheel angle, the vehicle speed influences the control response of the system (transformation of steering angle into 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.

To compensate for the natural oscillating movement of the vehicle when driving straight ahead, an area with lower sensitivity an enhanced damping has been provided (approx. ± 6° steering wheel angle). The steering wheel angle recorded via the steering angle sensor is made available by the steering column tube module and the information on speed and yaw rate of the vehicle is made available by the ESP control unit on the engine compartment CAN. All relevant information is forwarded by the central gateway control unit to the xenon headlamp control unit at the left front lamp unit on the diagnostic CAN. The xenon headlamp control unit at the left front lamp unit evaluates all the incoming data and as master synchronizes the xenon headlamp control unit at the right front lamp unit.

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).

If a fault is detected, the substitute lamp actuation function is activated. If the curve illumination actuation is defective, the headlamp units are, if possible, swiveled into the central position.

Additional function requirements, active light distribution
^ 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, motorway lights
^ Function activated via the instrument cluster
^ Extended fog light function inactive
^ Radius of curve r ≥800 m

Motorway lights function sequence
The motorway lights permit better illumination of the roadway at fast vehicle speeds.
This is achieved by increasing the light output and vertically deflecting the low beam cone.
The steering angle sensor records the steering wheel angle. Its data is read in by the steering column tube module and placed on the engine compartment CAN. Information on vehicle speed and yaw response is made available by the ESP control unit on the engine compartment CAN. All relevant information is forwarded by the central gateway control unit to the xenon headlamp control unit at the left front lamp unit on the diagnostic CAN. The xenon headlamp control unit at the left front lamp unit evaluates all the incoming data and as master synchronizes the xenon headlamp control unit at the right front lamp unit.

Starting at a vehicle speed of v = 70 km/h, the light output of the left bixenon light with integrated ignition module (E1e10) and the right bixenon light with integrated ignition module (E2e10) is increased linearly up to P = 38 W by the corresponding xenon headlamp control unit. In addition, starting at a vehicle speed of v > 100 km/h, the headlamp unit of the left front lamp unit is raised by actuating the left headlamp range adjustment motor (E1m1). The maximum lift is reached at v = 120 km/h. If the vehicle speed drops down to below v = 80 km/h, the "motorway 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 (using right-hand traffic as an example)
At a vehicle speed of v < 70 km/h, the xenon headlamp control unit at the left front lamp unit actuates the left headlamp range adjustment motor and the left dynamic curve illumination motor. The headlamp unit is swiveled outward through Alpha = 8° and then lowered. This in turn serves to reduce internal dazzling and the side illumination of the travel lane is improved.

If during active "extended fog lights" the high beams function is requested, the position of the headlamp unit is retained. If the "extended fog light function" is active the "dynamic curve illumination" function is switched off.