According to driving environment and loading state of
vehicle, head lamp lighting direction is changed to keep the driver''s
visibility range and to protect the driver''s vision from glare, aiming
at safety driving.
Sensor mounting on the rear center arm drives the actuator
mounting on the head lamp since sensing the input signal following the
vehicle''s statical changes.
Head lamp beam is automatically operated by chassis tilt.
Purpose of AHLS(Auto Headlamp Leveling System)
•
Compensation of headlamp visual range for changes in vehicle load.
•
Preventing oncoming traffic being blinded by excessive glare.
•
Meeting regulation
Operation
Operating Procedure
1.
Suspension angle change resulted from vehicle''s load change.
2.
Height sensor signal change
3.
Calculation of HLLD signal by AHLS ECU algorithm.
4.
Sending a proper signal to HLLD (head lamp levelling device) and driving actuator.
5.
Actuation of HLLD and compensation of headlamp beam range.
Operating Condition
•
IGN1 ON & Head lamp low bean ON
•
Sensor angle changed over 1° and keeping 10~12seconds with vehicle standing.
•
Sensor angle changed over 1° and keeping 10~12seconds and when vehicle runs over 20km/h with constant speed.
•
Leveling control is off after controlling HLLD for few seconds.
•
To eliminate mechanical tolerance, the lamp position is always reached from the lower side.
System characteristics
1.
Height sensor and link.
No.
Components
1
Sensor mounting bracket
2
Height sensor and link
3
Link bracket
•
Using a Micro-processor, percept the operation lever''s mechanical angle change or speed signal.
•
As an actuator control device of inner control program, mounting on the rear center arm.
2.
HLLD (head lamp leveling device) actuator.
•
Change the head lamp lighting direction up or down since
automatic head lamp levelling unit sensing the input signal following
the vehicle''s statical changes.
Inspection
[Measuring Resistance]
1.
Disconnect the cruise control switch connector from the control switch.
2.
Measure resistance between terminals on the control switch when each function switch is ON (switch is depressed).
Function switchTerminalResistance (±5%) [kΩ]CANCEL2 - ...
Special Service Tools
Tool(Number and Name)IllustrationUseDeployment tool0957A-34100AAirbag deployment tool.Deployment adapter0957A-3F100Use with deployment tool.(SAB)Deployment adapter0957A-3Q100Use with deployment tool.(DAB, PAB, CAB, BPT, EFD)Dummy0957A-38200Simulator to check the resistance ...