Hyundai Genesis: LKAS(Lane Keeping Assist System) / Description and Operation

Description
System Operation
The system is designed to help recognize the lane ahead and to give off a lane departure warning when the vehicle starts moving out of the lane by using the camera image and vehicle signal information.
LKAS Controller Typical Operating Conditions
Note that operating conditions are tuned to meet the customer requirements
-
Vehicle speed within 60kph – 200kph
-
A lane is clearly visible.
-
Driver is not overriding the system – applying a large steering torque
-
Directional (including hazard) signals are off
-
The lane width is within 2.7m to 4.2m
-
The curvature of lane is greater than 250m
-
The vehicle’s absolute lateral acceleration is < 2.5m/s2
-
The driver’s hands are on the steering wheel
-
The vehicle is not out of the lane by greater 0.3m
-
The absolute steering angle is < a given value (e.g 90 degrees)
-
The maximum allowable time for maximum torque application has not been exceeded. (90 seconds)
-
Reverse or EPS city mode is not engaged
-
No fault is present in the system
Lane Keeping Assist Operation Diagram
The overlay torque gives the driver an assisting torque towards the road center line.

1.
Warning Method
(1)
Cluster Display Symbols

Lane not detected
Lane detected and LKAS system engaged
Right side deviation

Left side deviation
Hold on the steering wheel
LKAS cancelled

? Display symbol and period vary according to vehicle's LCD and alarm.
(It is possible to adjust the light flickering period.)
   
LKAS 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).
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 straight road target; preferably wall mounted.
The LKAS camera will have a “System Out of Calibration” DTC set if not operating within specified tolerances.
The LKAS will be supplied for field service replacement with the “System Calibration / Verification Required” DTC set if it is a replacement part delivered directly from supplier manufacturing.
1.
Guidelines for Selecting a Suitable Target
In order to successfully complete LKAS Service Calibration-Static routine, the following conditions are required:
A.
Target (SST : 09890-3V100) surface must be perpendicular to the camera in both horizontal and vertical orientation to maintain maximum of 1° roll.
B.
Target to be mounted to rigid backer material to maintain flatness requirements.
C.
Target must have reflective (not faded or poorly painted) markings not to represent lane features.
D.
Target to be 30cm wide by 100cm tall.
E.
Mounting area must NOT have cross hatch patterns or textual markings near the target.
F.
Target should be well lit for optimal performance using non-fluctuating illumination. There shall be no continuous shadows cast on the target.

2.
Service Point Target Auto Calibration Procedure
(1)
Check the vehicle alignment and tire pressure levels to ensure accurate calibration of the camera. The vehicle is to be at nominal production loading capacity when the calibration routine is running.
(2)
Keep the windshield clean, and make sure that the camera is not blocked by silkscreen.
(3)
The service technician connects the diagnostic tool to the vehicle and starts the calibration routine. The camera module shall not be activated by pressing the switch.
(4)
The service calibration routine may not run correctly if there are any faults in the LKAS system.
(5)
If working with a replacement ECU: the service technician initiates the EOL Variant code configuration
(6)
The service technician either aligns the vehicle to the target or the target to the vehicle. (Close Target Calibration)
A.
Bottom of the target is to be 90cm ±2cm from the ground and aligned with the camera lens horizontal axis.
B.
The target is placed along the vehicle’s longitudinal axis (centerline) within ±5cm of target center.
C.
The vehicle bumper is to be within 10cm of target vertical plane and vehicle horizontal plane shall be within 1° of the target horizontal plane for the first “close” image collection.

(7)
Check first target placement location and then the “OK” message in the diagnostic tool (GDS).
(8)
Service technician either aligns the vehicle to the target or the target to the vehicle. (Far target Calibration)
A.
Bottom of the target is to be 90cm ±2cm from the ground and aligned with the camera lens horizontal axis.
B.
The target is placed along the vehicle’s longitudinal axis (centerline) within ±5cm of target center.
C.
The vehicle bumper is to be within 1.2m ± 20cm of the bumper and target horizontal plane of 1.2° from the initial target location for the second “far” image collection.
(9)
Check second target placement location and then the “OK” message in the diagnostic tool (GDS).
(10)
Complete the Service Point Target Auto Calibration Procedure on the diagnostic tool (GDS).
(11)
Eliminate all the DTCs.
(12)
IGN off and on.

Service Point Calibration (SPC)
This service point calibration (SPC) is required when the windshield glass or LKAS unit is replaced to set the camera pointing angle parameters without service point target (SST : 09890-3V100).
Before proceeding with the service point calibration (SPC) procedure, select and be prepared to drive on a calibration route with the following conditions.
-
The minimum vehicle speed: more than 22mph
-
The minimum driving distance: more than 1.1 mile
-
The lane markings must be clearly recognizable on both sides. (Faded lane paint may not be detected by the LKAS).
-
There should not be any sharp bends in the road (curvature radius of less than 820 feet).
-
There should not be sidewalks or other dividing structures along the edge of the lane.
   
If a suitable route is unavailable, the LKAS may be calibrated using a simulated straight road target (SST : 09890-3V100).
Refer to the "Service Point Target Auto Calibration (SPTAC)" procedure located in this description.
Service Point Calibration (SPC) Procedure
1.
Connect the DLC cable of the VCI to the data link connector located under the left side of dash.
2.
From the System Screen, select "LKAS" and click "OK".
3.
Click the "Vehicle S/W Management" tab. Select "SPC Calibration" under Data Treatment.

4.
Follow GDS prompts and perform all system checks before proceeding. When ready to begin driving click "OK".

5.
While driving on a suitable road for LKAS calibration, the GDS will show the calibration status.

   
Although the vehicle running on the straight roads enters curved roads or comes to stop, the progress in calibration process is maintained and the calibration process is resumed when the vehicle reenters the straight roads.when the vehicle reenters the direct roads.
The real driving time is subject to traffic and roads situation.
If calibration is not completed within ten minutes, the calibration process fails. In this case, the calibration process shall be repeated from the first phase.
Components and Components Location
Components 1. LKAS ON/OFF Switch2. Instrument Cluster3. LKAS Unit ...

LKAS Unit Components and Components Location
Components ...

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