The high-beam assistant (FLA) in the E70 supports the driver with operation of the high-beam headlight. The high-beam assistant automatically switches the high-beam headlight on and off depending on the traffic situation. The high-beam assistant detects oncoming vehicles and vehicles up ahead as well as consistently illuminated built-up areas.
The following components are described for the high-beam assistant:
The high-beam assistant can be activated only when the light switch is in position ”A”. The switch position ”A” stands for automatic driving light control.
The high-beam assistant is activated and deactivated by means of the turn-signal/high-beam switch in the SZL. The switch signals from the turn-signal/high-beam switch are picked up and evaluated by the SZL. The SZL sends the switch signals from the turn indicator-high-beam switch directly to the footwell module (FRM).
The RLSS measures the surrounding brightness. From dusk onwards, the footwell module (FRM) switches the low-beam headlight on. The high-beam assistant (FLA) can be activated only when the dipped headlights are on. The precondition is that the light switch must be in the ”A” position. The RLSS sends its information vie the LIN bus to the roof function centre (FZD).
The FZD processes the information from the RLSS. The FZD signals to the footwell module (FRM) the switch-on condition for the RLSS via the K-CAN.
The instrument cluster accommodates the following displays:
The image sensor is a special camera for detecting light sources. The image sensor transfers images to the high-beam assistant (FLA). The images are carried by an LVDS data line (LVDS: Low Voltage Differential Signalling). The FLA evaluates these images. The FLA sends a switch-on or switch-off recommendation for the high-beam headlight via the K-CAN to the footwell module (FRM). The recommendation depends on the traffic situation, the ambient light, and the car's road speed.
The DSC control unit calculates the car's road speed using the signals from the wheel-speed sensors. The DSC uses the signal from the DSC sensor to calculate the yaw rate. The high-beam assistant uses the information on the yaw rate to improve evaluation when the car corners. The DSC sends the results of the calculation of driving speed and yaw rate via the PT-CAN to the junction box electronics (JBE).
The FRM receives various input variables for the high-beam headlight.
The following input variables are processed by the FRM:
On the basis of the input variables, the FRM decides whether the high-beam headlights should be switched on or off. The FRM activates the high-beam headlights. The FRM actuates the indicator light in the instrument cluster. A Check Control symbol appears if the high-beam assistant fails. The FRM is connected to the K-CAN.
The JBE receives the calculations from the DSC via the PT-CAN. The JBE sends its information via the K-CAN to the FRM.
Graphic shows the interior rearview mirror on the E70
Index |
Explanation |
Index |
Explanation |
|---|---|---|---|
1 |
Rain/light solar sensor (RLSS) |
2 |
FLA control unit in the interior rearview mirror |
3 |
Buttons for the integrated universal remote control |
4 |
LED for anti-theft alarm system |
5 |
Image sensor |
6 |
Cover |
Block circuit diagram E70
Index |
Explanation |
Index |
Explanation |
|---|---|---|---|
1 |
Footwell module (FRM) |
2 |
High-beam headlight, left |
3 |
High-beam headlight, right |
4 |
Image sensor |
5 |
High-beam assistant (FLA) |
6 |
Junction box electronics (JBE) |
7 |
Wheel speed sensor |
8 |
DSC (Dynamic Stability Control) |
9 |
DSC sensor |
10 |
Instrument cluster |
11 |
Roof control panel |
12 |
Rain/light solar sensor (RLSS) |
13 |
Light switch |
14 |
Steering Column Switch (SZL) |
15 |
Turn indicator / high-beam switch |
|
|
In accordance with the traffic situation, the high-beam assistant sends a switch-on recommendation or a switch-off recommendation for the high-beam headlights to the FRM. On the basis of this recommendation and various other the input variables, the FRM decides whether the high-beam headlights should be switched on or off.
The following system functions are described for the high-beam assistant:
Pickup range of the image sensor
Index |
Explanation |
Index |
Explanation |
|---|---|---|---|
1 |
Light cone of the high-beam headlights |
2 |
Rear lights of a vehicle travelling ahead |
3 |
Pickup range of the image sensor towards the front |
4 |
Headlights of an oncoming vehicle |
The light cone of the high-beam headlights has a range of about 400 m. The image sensor can detect other light sources within a range of about 1000 m. This ensures that the image sensor detects oncoming vehicles before their drivers can be dazzled by the light cone of the high-beam headlights. When the image sensor detects an oncoming vehicle, the FLA control unit sends a switch-off recommendation to the FRM. The FRM switches off the high-beam headlights.
When the image sensor detects a vehicle ahead, the FLA control unit sends a switch-off recommendation to the FRM. The FRM switches off the high-beam headlights.
When the image sensor detects an environment in which ambient lighting is adequate, the FLA control unit sends a switch-off recommendation to the FRM. The FRM switches off the high-beam headlights. Adequate ambient lighting means:
If there is no reason for the lights to be dipped, the FRM switches on the high-beam headlights. The high-beam headlights are reactivated.
The high-beam assistant indicator lamp in the instrument cluster lights up as soon as the high-beam assistant (FLA) is activated. The high-beam indicator light also lights up (blue) in the usual way as soon as the high-beam headlights are switched on. A Check Control symbol appears (yellow) if the FLA detects a system failure.
The high-beam assistant (FLA) can be subject to function limitations under the following circumstances:
In order to ensure perfect function of the high-beam assistant, the image sensor must be aligned parallel to the centre axis. When the car is driven at night, the high-beam assistant can automatically correct alignment up to 3° to the left or 3° to the right. This correction compensates for minor deviations from the centreline. Driving conditions for automatic directional orientation of the high-beam assistant are:
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