Description
System Operation

LKAS(Lane Keeping Assist System) : This system is designed to support steering force and give lane departure warning with acoustic alarm and display when vehicle is located near lane edge and departure.

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 2.85m to 4.1m

-

The curvature of lane is greater than 250m

-

The vehicle’s absolute lateral acceleration is < 4.0m/s2

-

The driver’s hands are on the steering wheel

-

The vehicle is not out of the lane by greater 0.5m

-

The absolute steering angle is < a given value (e.g 90 degrees)

-

The maximum allowable time for maximum torque application has not been exceeded. (100 seconds)

-

No fault is present in the system

-

VDC or VSM is not operational

-

The vehicle is not braked hard (More than 3.0m/s2)

-

Reverse transmission is not engaged.

-

The angle between the vehicle and the lane is not great (3 degrees)

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 blinking period.)

caution

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 will be supplied for field service replacement with the “Camera Not Calibrated” DTC set if it is a replacement part delivered directly from supplier manufacturing.

1.

Guidelines for Selecting a Suitable Target

In order for LKAS Service Calibration-Static routine to complete successfully, 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 of vehicle toe-in and tire pressure levels to ensure proper alignment of the camera to the “world” before proceeding with calibration is suggested. The vehicle is to be at nominal production loading capacity when the calibration routine is running.

(2)

Windscreen must be clean and serigraphy checked so that there is no blockage of the camera.

(3)

Service technician connects the diagnostic connector and starts the vehicle. The camera module should not be activated by pressing the switch.

(4)

The service calibration routine may not run correctly if any system level fault is active.

(5)

If working with a replacement ECU: the service technician initiates the EOL Variant code configuration

(6)

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)

Technician ensures first target placement location and check the "OK" message on 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)

Technician ensures second target placement location and check the "OK" message on the diagnostic tool (GDS).

(10)

Complete the Service Point Target Auto Calibration Procedure on the diagnostic tool (GDS).

(11)

Clear the all of the DTCs.

(12)

IGN off and on.

note

Check that the variant coding is completed exactly.

Яндекс.Метрика