Adaptive Front-lighting System (AFLS)
AFLS(Adaptive Front-lighting System[] is a headlamp orientation control system that takes into account both steering angle and vehicle speed to orient the headlamps to an angle that provides better nighttime visibility.
Variable conditions make beam pattern of running vehicle kaleidoscope.
Component of AFLS
- Input part: It is provided that information of speed sensor, height sensor and so on related to condition of vehicle.
- Control part (AFLS Unit): It controls Output part by analyzing/judging Input signal.
- Output part: It drive Low beam of H/Lamp to upper/lower and left/right side optimum beam pattern according to output control signal of AFLS Unit.
Main function of AFLS
| Content | Description | |
|---|---|---|
| 1 | Dynamic Bending (Swivelling) | Providing optimum beam pattern in the curve road Enhanced visibility in the curve road Drive Low beam to left/right side |
| 2 | Automatic Leveling (Leveling) | Compensating Low beam according to inclination of vehicle Compensation according to static condition (Load) Compensation according to dynamic condition (Quick start, Sudden stop) |
| 3 | Fail-safe | Fail-safe reaction while detecting system failure and malfunction Detecting signal/communication error for Swivelling Detecting signal/communication error for Leveling Detecting system failure |
AFLS FUNCTION REFERENCE CHART
Advantage of AFLS
| Content | Description | |
|---|---|---|
| 1 | Enhanced stability | Visibility Guarantee In case of curve road According to vehicle Speed/Steering angle, speed/angle of Swivel actuator is automatically controlled to provide optimum beam pattern Fail-safe reaction application for Driver on opposite side road -->In case error communication, automatically return initial position of Swivel actuator |
| 2 | Enhanced convenience | AFLS operating application by driver's selection(AFLS Off switch) Providing Diagnostic function for detecting system failure and malfunction and check up data information (by using Diagnostic equipment) Reduced wiring-harness by Applying CAN/LIN communication in vehicle Fun Driving Function: Swivelling of Low beam --> Increasing driver's pride |
AFLS ADVANTAGE CHART
Scheme 18
- General System initialization, In case of input Engine signal (AFLS ECU, Levelling/Swivelling motor) Adaptation of AFLS OFF switch AFLS operate normally, only under turning low beam switch on. Providing Tell-tale function of AFLS(display 'AFLS OFF' on dashboard) In case of system failure, display blinking 'AFLS OFF' on dashboard.
- Main function Swivelling function Levelling function Processing signal of Height sensor(Air suspension)
Scheme 19
- General communicate AFLS Unit through LIN protocol Robust control to Disturbance Doesn't work out of rated voltage range.
- Main function & Rating Drive Low beam to left/right side Fail-safe function: In case of detecting malfunction or system failure, drive to secure position gear ratio (150: 1) Operating voltage: 10V ~ 16V Operating current: 100mA
Scheme 20
- Main spec communicate AFLS Unit through LIN protocol Robust control to Disturbance Doesn't work out of rated voltage range.
- Main function & Rating Drive Low beam to upper/lower Fail-safe function: In case of detecting malfunction or system failure, drive to secure position Drive type: Micro step mode (1/16) Operating voltage: 10V ~ 16V Operating current: 600mA
Scheme 21
- General Height Sensor connecting body & suspension measures inclination information from load condition. Vehicle having the Air-suspension system transmits inclination signal to AFLS ECU by using CAN protocol. Vehicle having the Steel-suspension system transmits inclination signal to AFLS ECU by using Hard-wire.
- Rating Rated Voltage: 5V ± 5%
AFLS Fail-safe Function
If the error condition of AFLS occurred during system operation, the system have to fail-safe reaction for prevent dazzling of opposite side driver
AFLS Fail-safe Index
| Part | Content | Fail-safe Reaction | Tell-tale Result | |||
|---|---|---|---|---|---|---|
| ECU | ECU Hardware (A/D Converter fail) | 1) Levelling: staying in current POS 2) Swivelling: staying in current POS | ||||
| ECU Software (EEPROM/ROM fail) | 1) Levelling: staying in current POS 2) Swivelling: staying in current POS | |||||
| Control Unit not initialized | 1) Levelling: drive to error POS (H-15) 2) Swivelling: drive to error POS (0°) | |||||
| Parameter missing | 1) Levelling: drive to error POS (H-15) 2) Swivelling: drive to error POS (0°) | |||||
| Levelling module fault | Right | Short circuit | 1) Right Levelling: staying in current POS 2) Left Levelling: drive to error POS (H-15) 3) Swivelling: Normal operation | |||
| Over temperature | ||||||
| LIN communication error | 1) Levelling: drive to error POS(H-15) (After) Levelling: staying in current POS (Before) 2) Swivelling: Normal operation | |||||
| Left | Short circuit | 1) Left Levelling: staying in current POS 2) Right Levelling: drive to error POS(H-15) 3) Swivelling: Normal operation | ||||
| Over temperature | ||||||
| LIN communication error | 1) Levelling: drive to error POS(H-15) (After) Levelling: staying in current POS (Before) 2) Swivelling: Normal operation | |||||
| Swivelling module fault | Right | Short circuit | 1) Right Swivelling: staying in current POS 2) Left Swivelling: drive to error POS(0°) 3) Right Levelling: drive to error POS(H-28) 4) Left Levelling: Normal operation | Tell-tale | ||
| Over temperature | ||||||
| Stall detected | ||||||
| LIN communication | LIN fault | Before | 1) Swivelling: staying in current POS 2) Left Levelling: drive to error POS(H-28) | |||
| After | 1) Swivelling: drive to error POS(0°) 2) Left Levelling: drive to error POS(H-28) | |||||
| DBL supply fault | Before | 1) Swivelling: staying in current POS 2) Left Levelling: drive to error POS(H-28) | ||||
| After | 1) Right Swivelling: staying in current POS 2) Left Swivelling: drive to error POS(0°) 3) Left Levelling: drive to error POS(H-28) | |||||
| Left | Short circuit | 1) Left Swivelling: staying in current POS 2) Right Swivelling: drive to error POS(0°) 3) Left Levelling: drive to error POS(H-28) 4) Right Levelling: Normal operation | Tell-tale | |||
| Over temperature | ||||||
| Stall detected | ||||||
| LIN communication | LIN fault | Before | 1) Swivelling: staying in current POS 2) Left Levelling: drive to error POS(H-28) | |||
| After | 1) Swivelling: drive to error POS(0°) 2) Left Levelling: drive to error POS(H-28) | |||||
| DBL supply fault | Before | 1) Swivelling: staying in current POS 2) Left Levelling: drive to error POS(H-28) | ||||
| After | 1) Left Swivelling: staying in current POS 2) Right Swivelling: drive to error POS(0°) 3) Left Levelling: drive to error POS(H-28) | |||||
| AXLE sensor | Front & Rear | External(5V) Sensor power supply fault (short to ground or to Bat) | 1) Levelling: drive to error POS(H-15) 2) Swivelling: Normal operation | |||
| Front | FREQ_LOWER, FREQ_UPPER | 1) Levelling: drive to error POS(H-15) 2) Swivelling: Normal operation | ||||
| Signal line open circuit | 1) Levelling: drive to error POS(H-15) 2) Swivelling: Normal operation | |||||
| Signal line short circuit | ||||||
| Front sensor out of range | ||||||
| Front sensor out of range | FREQ_LOWER, FREQ_UPPER | 1) Levelling: drive to error POS(H-15) 2) Swivelling: Normal operation | ||||
| Signal line open circuit | 1) Levelling: drive to error POS(H-15) 2) Swivelling: Normal operation | |||||
| Signal line short circuit | ||||||
| Front sensor out of range | ||||||
| Battery | Battery voltage too high | 1) Levelling: drive to error POS(H-15) 2) Swivelling: staying in current POS(Before) Swivelling: drive to error POS(0°) | ||||
| Battery voltage too low | 1) Levelling: drive to error POS(H-15) 2) Swivelling: staying in current POS(Before) Swivelling: drive to error POS(0°) | |||||
| LIN physical fault | Short circuit to battery or GND (physical fault) | Before | 1) Levelling: staying in current POS 2) Swivelling: staying in current POS | Tell-tale | ||
| After | 1) Levelling: drive to error POS(H-28) 2) Swivelling: drive to error POS (0°) | |||||
| CAN communication fault | Speed signal fault | Speed signal invalid | 1) Levelling: slow dynamic mode 2) Swivelling: drive to error POS (0°) | |||
| Supplying ECU not available on CAN | ||||||
| Steering angle signal fault | Steering wheel sensor not O.K (signal invalid) | 1) Levelling: normal operation 2) Swivelling: drive to error POS (0°) | ||||
| Supplying ECU not available on CAN | ||||||
| Gearbox signal fault | Reverse gear signal invalid | 1) Levelling: normal operation 2) Swivelling: drive to error POS (0°) | ||||
| Supplying ECU not available on CAN | ||||||
| Accelerator pedal signal fault | Accelerator pedal signal invalid | 1) Levelling: Reduced performance 2) Swivelling: Normal operation | ||||
| Supplying ECU not available on CAN | ||||||
| Engine state signal fault | Engine state signal invalid | 1) Levelling: Normal operation 2) Swivelling: Normal operation | ||||
| Supplying ECU not available on CAN | ||||||
| Yaw rate signal fault | Yaw rate signal invalid | 1) Levelling: Normal operation 2) Swivelling: Reduced performance | ||||
| Supplying ECU not available on CAN | ||||||
| Brake pedal signal fault | Brake signal invalid | 1) Levelling: Normal operation 2) Swivelling: Reduced performance | ||||
| Supplying ECU not available on CAN | ||||||
| Air suspension ECU sensor signal invalid | Invalid sensor value from air suspension ECU | 1) Levelling: drive to error POS(H-15) 2) Swivelling: Normal operation | ||||
| Air suspension CAN signal time out | No CAN signal from air suspension | 1) Levelling: drive to error POS(H-15) 2) Swivelling: Normal operation | ||||
| CAN 'Bus off' fault | ECU is isolated from the CAN network | Air suspension | 1) Swivelling: drive to error POS(0°) 2) Levelling: drive to error POS(H-15) | |||
| Steel suspension | 1) Swivelling: drive to error POS(0°) 2) Levelling: slow dynamic mode | |||||
| H/wire | AFLS switch fault | Open wire | 1) Swivelling: Normal operation 2) Levelling: Normal operation | |||
| H/Lamp switch fault | Open wire | AFLS OFF S/W ON | 1) Swivelling: DBL activated 2) Levelling: HLL activated | |||
| AFLS OFF S/W ON | 1) Swivelling: DBL activated 2) Levelling: HLL activated | |||||
AFLS FAIL-SAFE INDEX
AFLS Setting Procedure
When it replace AFLS ECU, H/Lamp Unit, Height sensor, it operates in setting procedure by using Diagnostic equipment following below.
Parameter is composed of three state (Air-suspension, Steel-suspension, Delivery state)
When AFLS setting procedure operate, necessarily confirm suspension type and then download parameter.
Scheme 22
DTC: Diagnostic Trouble Code
DBL: Dynamic bending Light
HLL: Head Lamp Leveling
Vehicle Condition While AFLS Setting
- Vehicle on an even surface
- No vehicle movement
- Gear position in P & N
- Ignition switched on & Engine RPM >500RPM
- Diagnostic equipment connected
- ALL ECUs on CAN mounted and activated
- Battery voltage > 10.5 V (ECU supply to be ensured)
- Light switched
- AFLS on (Don't push AFLS OFF switch)
Action In Case Of Download Wrong Parameter
- In case Steel suspension vehicle downloaded Air-suspension parameter --> B1638 (Air-Sus. CAN Signal Timeout) occurred
- In case Air-suspension car downloaded Steel suspension parameter --> B1907 (FRT Sensor signal Fault), B1909 (Rear Sensor signal Fault) occurred
- Solution Download Delivery Parameter check up B1661(Parameter missing) Ignition OFF Ignition ON & Engine RPM > 500RPM Download matching Parameter (Steel & Air suspension) In case download steel suspension parameter, Calibration have to operate up to setting procedure
AFLS Unit(ECU)
AFLS located in Cockpit Module is provided information of vehicle (steering wheel signal, vehicle speed, inclination of vehicle).
Based on provided information, it calculates algorithm and adjust Low beam of H/Lamp.
It transmits driving information by using LIN protocol, it is operated in Fail-safe reaction mode In case system failure occurred.
Swivelling Actuator
Swivelling actuator inside H/Lamp is provided driving information of left/right side by using LIN protocol from AFLS Unit(ECU).
It drive to control position by using step motor.
In case of system failure, it provides function to back to initial position(center).
Levelling Actuator
Levelling actuator inside H/Lamp is provided driving information of upper/lower by using LIN protocol from AFLS Unit(ECU)
It drive to control position by using step motor.
In case of system failure, it provides function to lower to -2.8% or -1.5% position.
Scheme 23
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- Disconnect the negative (-) battery terminal.
- Remove the glove box housing (A). (Refer to the " «CRASH PAD»(ref-417751-S11778651202011083000000) ")
- Disconnect the glove box housing connector (A).
- Remove the DIS head unit. (Refer to «DIS SYSTEM»(ref-417775-S15808840842011083000000) )
- Remove the USB interface unit.
- Remove the front/rear parking assist system unit. (Refer to «FRONT/REAR PARKING ASSIST SYSTEM»(ref-417776-S05755516982011083000000) )
- Remove the AFLS unit(A) after removing connector and nuts(2EA).
AFLS Unit
- Install the AFLS unit after connecting the connector.
- Install the front/rear parking assist system unit.
- Install the USB interface unit.
- Install the DIS head unit.
- Install the glove box housing.
- Connect the negative (-) battery terminal.
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Scheme 31
- Disconnect the negative (-) battery terminal.
- Remove the height sensor linkage (A) installed on the front axle and rear axle. (Number of height sensor : Air suspension - 4EA, Non-air suspension - 2EA).
- Remove the height sensor assembly after disconnecting the connector.
- Remove the height sensor unit (A) after removing screws(2EA).
Height Sensor
- Install the height sensor unit.
- Install the height sensor assembly after connecting the connector.
- Install the height sensor linkage on the front axle and rear axle.
- Connect the negative (-) battery terminal.