Typically, lane departure warning is activated at a speed
over 70 KPH, but suppressed in case of unintentional lane departure when
driver do not operate turn signal.
System Operation Conditions
1.
User Conditions
(1)
When unintended lane departure is occured, warnings are generated.
(2)
When driver operates a turn signal for lane departure, no warnings are generated.
2.
Vehicle Conditions
(1)
When the accelerated velocity of vehicle exceeds certain speed, LDW system is activated.
(2)
When a turn signal is not used. LDW system activates.
3.
Lane Conditions
(1)
lanes are visible and recognizable , LDWS can be on normal operation mode.
(2)
Operate on all roads, including highways, country roads and urban freeways at a speed of 70 km/h and from 2.5
to 5.0 meters of lane width.
(3)
Lane material: asphalt roads, concreat roads
(4)
Lane color: White, Yellow, Blue,
(5)
Temporary lane marker for repairing road
(6)
lanes are visible and recognizable, LDWS can be on normal operation mode independent of season or time,
(7)
Operate under partially visible lane markers such as and
regardless of inclement weather, including rain and wet roads, and time
limit
(8)
Be performed in a curve of radius 250 meters
Lane Departure Warning
This lane Departure Warning Algorithm is for HKMC whole vehicle that will apply to LDWS
1.
Lane departure warning start speed: 70KPH
(1)
Warning Start Speed: 70KPH
(2)
Warning Stop Speed: 65KPH
To prevent repetation of system warning on and off according
to vehicle speed variation, This specification establish warning stop
speed as 55 KPH for hystheresis characteristic.
2.
Warning Method
(1)
Warning Device
Cluster, Buzzer
(2)
Cluster Display Symbols
Lane not detected
Lane detected and warning system engaged
Right side deviation
Left side deviation
Wiper motor speed is more than 45 RPM
System malfunction
※ Display symbol and period vary according to vehicle''s LCD and alarm.
(It is possible to adjust blinking period.)
Lane Type
LDW System can recognize a full lane, a dotted lane, Bott’s Dot and yellow Retroreflective on a road.
In case of double lane, LDW System can recognize the lane on the inside. This is a standard about a dotted lane.
Recognition of double lane
In case of double lane, LDW System can recognize the lane on the inside.
Determination of Lane Departure
Lane Departure is determined according to vehicle speed, lane width and color.
LDW System set lane recognition error limits under 8cm.
1.
Lane width (L)
If Lane width is 2.5 ~ 5.0m(Including North America standard)
then departure warning is activated. Also Lane width is less than 2.8m
then departure warning is deactivated.
2.
Line painted width (p)
Line painted width is refered to 16cm (the minimum 10cm, the
maximum 55cm). LDWS can distinguish left,right lane color. If it is
technically possible, LDWS can distinguish kind of lane such as solid
and dot.
3.
Vehicle Width (W)
Vehicle width is defined by kind of vehicle.
4.
Left,Right normal Lane (Blue, White, Right Yellow)
Condition : Lane width standard is a 16cm.
a.
1st Lane Departure Warning
The departure alarm of the general lane when the wheel of the vehicle reaches to the lane, does in standard.
b.
Cancellation of lane departure warning
When the vechicle departs the lane toward opposite lane more than 40% of the lane width, the warnings are stopped.
5.
The case of recognizing one of two lines (lane)
The case of recognizing one of two lane, system provide departure warning using one line.
Lane departure warning deactivation
1.
Turn signal is actived
a.
Depart from lane after turn signal is activate
If vehicle departs from lane after turn signal is activated,
the departure warning of turn signal direction is not activated. Warning
alarm is not activated while turn signal is activated. If turn signal
is deactivated during lane departure after turn signal activates, system
can issue warning after 2sec when it can recognize lane.
If turn signal is deactivated after lane departure during turn signal activated, Warning signal can be generated after 2 second.
b.
Turn signal is activated after lane departure
Alarm is immediately deactivated when driver operates turn signal during lane departure.
Alarm can be activated again after 2 second when turn signal is deactivated.
2.
Tracking on a curve under 250m radius
When measured curve radius which is derived from lane recognition and Yaw Rate is under 250m,
LDWS do not warn lane departure. LDWS can recognize if a road curvature condition is under 250m
(R >= 250m)
3.
Lane is unrecognizable
a.
During the warning, lane becomes unrecognizable
–
In lane departure alarm, the case where one lane becomes
unrecognizable: Alarm is activated using previously measured lane width,
a hue and a curvataure.
–
In lane departure alarm, the case where both lanes become
unrecognizable: Lane departure Warning is immediately stopped and LDWS
signal that lanes are unrecognizable to warn its condition to driver.
b.
A line is unrecognizable
During vehicle is tracking the lane, if a line is not
recognizable, LDWS can excute lane departure warning using previous lane
width which is measured from previous image processing. LDWS normally
refer the color of lines to previous recognition result, but if there
are any changes of system operation and power on/off, when system can
not determine the color of the lane, system can excute lane departure
warning algorithm refer lane color to white. When system line
unrecognized state is maintained, System status is changed to line
unrecognized state.
c.
Both lanes are unrecognizable
LDWS signal the status of unrecognizable lane. If there are
none of additional indicator, system do not indicate recognition status.
LDWS is capable of recognizing continuing lines as lanes and
has limited lane recognition capabilities when it comes to sharp-bending
roads.
In addition, the system may not function properly under the following circumstances:
–
No or faded lane markings (failed lane detection).
–
Low visibility due to foul weather conditions.
–
Low light or sudden change in exterior light conditions.
–
Sharp bends of the road (curvature radius of less than 250m).
–
Sidewalks and other dividing structures along the edge of the lane.
–
Dirty windshield (low camera visibility).
Camera Calibration
1.
Necessity
Once installed to the vehicle, LDWS needs to be calibrated to achieve accurate lane marking recognition.
Specifically, the system needs to be calibrated to correct
any difference between the ideal road coordinates and the actual road
coordinates.
–
When replacing the lane departure warning system unit.
–
When repairing the roof panel of chassis by vehicle crash.
–
When repairing the LDWS unit mounting bracket
–
The system need to be calibrated to corect any vehicle crash.
2.
Schedule
Calibrate after LDWS replacement and as necessary.
–
Condition : There should be an error between ideal road coordinates and actual road coordinates after installing the LDWS unit.
–
Object : Calibrate an error in LDWS unit to improve coordinates accuracy.
–
Procedure : Operate the calibration procedure using the GDS and calibration target jig.
–
Environment : Vehicle on an even surface and align the center of target jig to down the degree of scattering.
–
Calibration process : Refer to bellow "Calibration procedures"
Calibration Procedures
1.
Install the calibration target jig (09890-3N100) on the hood.
2.
Install the target jig at the end of the hood (B) after alighting the center (A) of the target jig and emblem.
Tolerance : ± 0.19 in (± 5mm)
3.
Adjust the top of target jig to center a drop of air (A) in circle by bending the target board.
(To adjust the target vertically)
4.
Connect GDS to the vehicle to calibrate LDWS unit.
5.
Select model and LDWS system.
6.
Select calibration.
7.
Operate calibration automatically.
8.
Select "LDWS Reference Point Calibration" and complete calibration procedures.
Disassembly
•
Use fender covers to avoid damaging painted surfaces.
•
To avoid damage, unplug the wiring connectors carefully while holding the connector portion.
•
Mark all wiring and hoses to avoid misc ...
Special Service Tools
Tool(Number and Name)IllustrationUse09581-11000Piston expanderSpreading the front and rear disc brake piston.09580-0U000Brake piston adjusterRemoval and installtion of the rear disc brake piston.
...
Components and Components Location
