Kia Cee'd: Lane Departure Warning System (LDWS) / Description and operation
Block Diagram
LDWS is composed of below units
No
|
Item
|
Function
|
Position
|
1
|
LDWS UNIT
|
1) |
Lane Departure Warning System (LDWS) : Detects drive lane in
front and engages warning function if the vehicle is in danger
of departing from the drive lane.
|
2) |
FCW : Monitors front of the vehicle and engages warning function
if the vehicle is in danger of collision
|
3) |
High Beam Assist (HBA) : Detects head lamp and tail lamp lights
of vehicle ahead and turns the high beam ON/OFF.
|
4) |
SLIF (Speed Limit Information Function)
: Detects traffic signs with camera and display speed limit
informatin using the map data from navigation.
|
|
Windshield Glass
|
2
|
LDWS Switch
|
LDWS On/Off Switch
|
Crash Pad (Left)
|
3
|
Multi-function Switch
|
HBA On/Off Switch (MF : Auto mode)
|
Steering Wheel
|
4
|
User Setting Menu
|
SLIF On/Off, FCW On/Off Menu
|
Cluster menu
|
5
|
Cluster/Buzzer
|
SLIF/ FCW/LDWS Waning
|
Cluster
|
※ Europe : (LDWS/SLIF) / China, Middle East, Australia: (LDWS)
Camera unit of the LDWS processes the following functions using the video signal
input.
– |
Detect and analyze drive lane
|
– |
Detect the light from foregoing vehicle
|
– |
Detect and analyze status of foregoing vehicle, and make warning sounds
(or message) for driver if necessary.
|
– |
Transmits the information using high speed CAN communication
|
1. |
Lane Departure Warning System (LDWS) unit
The lane departure warning system is a convenient device that recognizes
the lanes ahead using the camera image and vehicle signal informtaion
and alarms the driver in case of deviation from the lane. It consists
of the camera unit and recognizes the lane by calculating the camera
image input signal.
The sensor module that processes screen image by sensing the lane ahead
on the camera unit, senses the lane and calculates key parameters, i.e.
vehicle center offset, road width, vehicle driving angle and road curvature,
to keep to the lane. The following procedures are the lane recognizing
process through screen image processing.
(1) |
Sensing the land in procedure of Inputting the road image
|
(2) |
Filtering calculation emphasizing the lane
|
(3) |
Extraction of the lane candidate point (The constituent points
which are estimated as lane)
|
(4) |
Sensing the land by means of candidate point
|
|
2. |
LDWS Operation process
When the LDWS switch is pressed, the operation state of the lane departure
warning system is displayed at the center while the LDWS lamp is on.
The specific classification of the displays is shown in the following
table.
Category
|
Operation
|
LDWS Display and Alert
|
Control
(Button)
|
On
|
LDWS On
|
|
Off
|
LDWS Off
|
Operation Status
|
Cluster indicator
|
Operation Condition
|
Activates if vehicle speed exceeds set speed with LDWS ON.
[Start : 60km/h (37mph) ↑]
[Stop : 55km/h (34mph) ↓]
※ Lane departure warning is not activated if turn signal or hazard
lamp is ON.
|
|
|
3. |
FCWS Operation process
Category
|
Operation
|
LDWS Display and Alert
|
Control
(USM)
|
On
|
FCW On
|
|
Off
|
FCW Off
|
Operation Status
|
Displayed only when alarm is activated
|
Operation Condition
|
Activates if vehicle speed exceeds set speed with FCW ON.
[Start: 40km/h (25mph) ↑]
[Stop: 35km/h (22mph) ↓]
|
6.
|
FCWS Control Switch:Composed of User Set Menu (USM)
|
|
|
4. |
High Beam Assist
(Multi-function Switch Auto/High beam position)
Category
|
Operation
|
LDWS Display and Alert
|
Control
(Button)
|
On
|
If High Beam switch is turned ON (push-return) while the Multifunction
Switch is set to Auto.
|
HBA On + Low beam
HBA On + High beam
|
Off
|
If High Beam switch is activated again while the Multifunction switch
is NOT set to Auto or when HBA is ON.
|
Operation Status
|
Cluster display
|
Operation Condition
|
Activates if vehicle speed exceeds set speed with HBA ON.
[Start: 40km/h (25mph) ↑]
[Stop: 35km/h (22mph) ↓]
※ Activates only if Multifunction switch is set to Auto and Low
Beam is ON.
|
|
|
LDWS ON/OFF switch (A)
When the LDWS switch is pressed, the LDWS is on while the LDWS lamp is on. When
the switch is pressed again, the LDWS is off and the display lamp is off.
High Beam Auto Control Switch: High Beam Auto Control System is turned ON if
the Multifunction Switch Light SW is set to AUTO, and the Light SW is set to
High Beam position (Pushed).
– |
If the Light SW is not set to AUTO, or to High Beam position, the High
Beam Auto Control System is turned OFF.
|
The alarm method of LDWS
1. |
Visual alarm : The lane to the direction of departure brinks "yellow".
|
The operating conditions of LDWS
The operating conditions of LDWS is as below.
1. |
The switch for LDWS shall be ON. The LDWS lamp is on in the instrument
panel when the switch is on.
|
2. |
It operates when the LDWS function is set and the vehicle speed exceeds
60km/h (37mph).
The alarming function is stopped tentatively when the vehicle speed
is lower than 60~55km/h (37~34mph) and the alarming is restarted when
it is over 60km/h (37mph).
|
3. |
If the driver operates left and right turning lamps to inform the intention
of lane change, there will be no alarm regardless of the direction of
lane departure.
The lane departure alarming function is restarted after 2 seconds from
switching off the left and right turning lamps.There will be no alarm
when operating the hazard lamps.
|
4. |
Operate the switch for turning lamps and then change the lane. Random
changing of lanes without operating the turning lamps to the driving
direction generates the alarm.
|
5. |
When more than 40% of the vehicle body has crossed the lane, the alarm
is released by sensing departure for lane change.
|
6. |
The lane departure alarming is not made when the vehicle drives at the
center of the lane.
Take caution in the following conditions as the LDWS may not
operate properly.
–
|
When the lane is not well visible due to rain, snow,
dust, puddle or other foreign materials
|
–
|
When the sight is unclear due to bad weather such as
fog/heavy rain/heavy snow
|
–
|
When solar beam, street lamp or light from approaching
car is reflected on the wet surface of the road
|
–
|
When the brightness has changed abruptly by exiting
from the tunnel
|
–
|
When the back light is illuminated strongly against
the vehicle direction
|
–
|
When the headlamp is not used or the light beam is too
weak in the night or inside the tunnel
|
–
|
When the lane is not distinctive and the road is damaged
|
–
|
When the shadow of median strip covers the lane
|
–
|
When the lane and road are not distinguished by the
dusts on the lane
|
–
|
When there are more than 2 lanes to the left or right
such as the exclusive road of the bus
|
–
|
On winding road or steep road
|
–
|
When there are signs other than the lane near the lane
or similar signs with the lane (E.g. Arrow)
|
–
|
When there is a boundary structure such as the sidewalk
block
|
–
|
When the windshield or LDWS camera lens are contaminated
with the moisture or foreign material
|
–
|
When the distance to the foregoing car is extremely
short or the foregoing car is driving on the lane
|
–
|
When the vehicle is extremely disturbed
|
–
|
In the section of diverging or converging lanes or complicated
crossing of the lane (E.g. Interchange and tollgate)
|
–
|
When an object is placed on the dashboard
|
–
|
Arrow on the road surface
|
–
|
When the lane is too narrow or too wide
|
–
|
When the color of the lane is hard to be distinguished
from the road
|
–
|
When the temperature around the room mirror is very
high by direct sunlight
|
–
|
When the LDWS doest not sense the color of the lane
due to surrounded lighting (E.g. Inside the tunnel,
the section of natriumlamps in the night and rain)
|
–
|
When the sight is bad enough not to sense the other
lanes
|
|
–
|
This system does not operate when the vehicle speed
is under 60km/h (37mph) or the lane marking is not sensed.
|
–
|
Do not use windshield tinting and do not place stickers
or accessories around the inside rearview mirror.
|
–
|
Keep the LDWS away from water.
|
–
|
Do not disassemble or impact on the LDWS parts randomly.
|
–
|
Do not place the reflective material (white paper or
mirror) on the dashboard as sunlight reflection may
cause malfunction.
|
–
|
Driver may not be able to hear the LDWS alarm sound
due to excessive noise.
|
|
|
Components
1. LDWS ON/OFF switch
2. Instrument cluster
3. LDWS unit
...
Service Point Target Auto
Calibration (SPTAC)
This procedure provides a way to calibrate the camera by having the service
technician align the car to a well lit simulated straig ...