Electrics
Page 9.7
Automatic Range Adjustment
The automatic range adjustment function is integrated in the headlight
control unit. The dynamic range adjustment system keeps the inclination
of the light rays (dipped beam Bi-Xenon module and static cornering
light) at the preset value of -1 % independently of the vehicle’s load so
that neither the vehicle’s load nor the pitching movements resulting from
the vehicle’s driving dynamics can “blind” oncoming traffic when dipped
beam is switched on, while at the same time ensuring an adequate
range of vision for the driver.
The system responds very quickly to braking or acceleration. The motor
begins to adjust the headlights after commencement of the pitching
movement. When the vehicle is stationary, the vehicle’s inclination is
calculated from the sensor signals and the headlight settings are
corrected according to the difference between their required and actual
positions. The full scope of functions is maintained when high beam is
switched on. This results in increased driving safety while at the same
time reducing the strain on the driver.
The following CAN signals are required for calculating automatic
range adjustment and the functions of the actuators:
• Steering angle
• Yaw rate
• Left + right direction indicator
• Vehicle level, front + rear
• Wheel speed
• Motor operating status
• Dipped beam status
• Light sensor
• Brake light switch
• Reverse gear
• Synchronization data (from headlight control unit)
• Accelerator pedal
Based on these signals, a microprocessor controller calculates the vehi-
cle’s pitch angle and the required positions of the stepping motors in the
headlight for the purposes of range adjustment.
Notes
Vehicles with steel springs. In this case, the self-levelling sensors are
read in directly by the left headlight control unit and the sensor values
are transmitted to the right headlight control unit in the form of a CAN
signal.
Notes
The system is adapted to the different
types of vehicles by programming the
vehicle specific parameters using the PIWIS
Tester.
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