Lane Keep Assist (LKA)

Components and Component Location

Components

* MFC: Multi-Function Camera

• Functions: LKA, HBA, ISLW, FCW, SCC

Description and Operation

Description

System Block Diagram

System Features

The LKA camera module processes the following functions using the input video signal.

1. 1

   LKA (Lane Keeping Assist): The system is designed to help recognize the lane ahead and provide a warning when the vehicle begins to drift out of its lane, using camera images and vehicle information signals.

2. 2

   High Beam Assist (HBA): Detects the headlights and taillights of vehicles ahead and turns the high beams on/off.

3. 3

   Intelligent Speed Limit Warning (ISLW): detects road signs with the camera and displays the speed limit using navigation map data.

4. 4

   It supports Forward Collision-Avoidance Assist (FCA) systems.

Lane Keep Assist (LKA)	High Beam Assist (HBA)
Lane Keeping System	When light from a vehicle ahead is detected

Intelligent Speed Limit Warning (ISLW)	Forward Collision-Avoidance Assist (FCA)
Speed Limit Information	Vehicle and Pedestrian Detection

System Activation Conditions

Typical Operating Conditions of the LKA Controller

Note that the operating conditions are adapted to customer requirements.

• Vehicle speed within 60 km/h – 175 km/h

• Lane markings are clearly visible.

• Driver does not overload the system by applying excessive torque to the steering wheel.

• Turn signals (including hazard lights) are off.

• Lane width from 2.8 m to 4.3 m.

• The driver's hands are on the steering wheel.

• Absolute steering wheel angle is less than the specified value (e.g., 90 degrees).

• The maximum allowable time for applying maximum torque has not been exceeded (90 seconds).

• Reverse or city mode of EPS is not engaged.

• There is no system malfunction.

The HBA activation conditions are as follows:

• HBA is activated when the light switch is in the "AUTO" position and the high beam switch is turned on (pressed).

• HBA is activated when the function is enabled and vehicle speed is 45 km/h or higher, and is automatically deactivated when vehicle speed is 35 km/h or lower.

• HBA does not activate during daytime, even if the activation conditions are met.

• At night, HBA detects the light of vehicles ahead and automatically turns the high beams on or off.

The DAA activation conditions are as follows:

• This function must be enabled in the User Setting Mode (USM) of the cluster.

• The function must be turned on and the vehicle speed must be 60 km/h - 175 km/h.

Repair Procedures

Service Point Target Automatic Calibration (SPTAC)

This procedure calibrates the camera. Align the vehicle with a well-lit simulated straight road target, preferably a wall, when contacting the service technician.

The LKA camera will set the DTC "System Out of Calibration" if it is not operating within the specified tolerances.

A replacement LKA will be supplied for field replacement together with "System Calibration". The diagnostic trouble code "Required/Variant Coding Error" is set if the part is a replacement part supplied directly from the manufacturer.

1. 1

   Guidelines for Selecting a Suitable Target

   The following conditions are required for the LKA Service Calibration-Static procedure to complete successfully:

   • The target surface (SST: 09890-3V100) must be perpendicular to the camera both horizontally and vertically, maintaining a maximum 1° roll.

   • The target must be attached to a rigid support material to maintain flatness.

   • The target has reflective markings (not faded or poorly colored) that are distinct from lane features.

   • Target is 30 cm wide and 100 cm high.

   • The mounting area must NOT have hatching or text markings near the target.

   • The target must be well lit for optimal performance when using non-flickering lighting. There must be no continuous shadows on the target.

   

2. 2

   Automatic Calibration Service Target Procedure

   1. It is recommended to check the vehicle wheel alignment and tire pressure to ensure correct camera alignment to the "world" before continuing with the calibration. The vehicle performing the calibration procedure must have its rated production load.

   2. The windshield must be clean and free of silkscreen so that there is no obstruction to the camera.

   3. The service technician connects the diagnostic connector and starts the vehicle. The camera module must not be activated by pressing the switch.

   4. The service calibration procedure may not work correctly if a system-level fault is active.

   5. When working with a replacement ECU: the service technician initiates the SPTAC reset configuration.

   6. The service technician aligns either the vehicle to the target or the target to the vehicle.

      a.	The lower edge of the target is located 90 ± 1 cm (35.4 ± 0.4 in.) above the ground and aligned with the horizontal axis of the camera lens.

      b.	Position of target (A) for short distance: 0 ± 5 cm (0 ± 2 in.) (B) in front of the front bumper.

      b.	Position of target (A) for long distance: 100 ± 5 cm (39.4 ± 2 in.) (B) in front of the front bumper.

Test Drive