LANE DEPARTURE ALERT SYSTEM SYSTEM DESCRIPTION


  1. LANE DEPARTURE ALERT SYSTEM DESCRIPTION


    1. The lane departure alert system is a system which uses the forward recognition camera to recognize and determine the lane and the position of the vehicle when the vehicle is being driven on highways and other roads with white (yellow) lines. Based on the situation, this system provides information and warnings for the driver.

  2. FUNCTION DESCRIPTION

    FUNCTION DESCRIPTION
    Lane departure alert function If the system judges that the vehicle may deviate from the lane it is in, the system illuminates the lane departure alert indicator in the combination meter display and sounds a buzzer to inform the driver of a possibility of lane departure.
    Vehicle sway warning function If the system detects that the driver is inattentive based on the position of the vehicle within its lane and the steering inputs of the driver, it sounds the buzzer and displays a message in the combination meter display to inform the driver to stop and take a rest.

    Tech Tips

    The last memory function, which resumes the settings that were set before the engine was stopped, is provided.

  3. SYSTEM SPECIFICATION

    Operation speed Approximately 50 km/h (32 mph) or more.
    Operation lane width Approximately 3 m (10 ft.) or more.
    Operation curve radius Approximately 150 m (493 ft.) or more.

  4. OPERATING CONDITIONS


    1. Lane departure alert function can operate if all of the following base conditions are met:


      • The lane departure alert main switch is turned on.

      • The vehicle speed is within the operation conditions.

      • The vehicle is driving in a lane with a width within the operation conditions.

      • The vehicle is driving on a straight road or a road with a slight curve.

      • Lane markers are detected.

      • The lane departure alert system has no malfunctions.

      • The turn signal switch is off.

    2. Vehicle sway warning function can operate if all of the following base conditions are met:


      • The lane departure alert main switch is turned on.

      • The vehicle speed is within the operation conditions.

      • The vehicle is driving in a lane with a width within the operation conditions.

      • The vehicle is driving on a straight road or a road with a slight curve.

      • The lane departure alert system has no malfunctions.

  5. CONTROL OF EACH FUNCTION


    1. Lane departure alert function:


      1. A warning is output when a front wheel starts to cross a lane marker.

        Tech Tips

        When the deviation speed (lateral travel speed) is slow, the warning may be output after the front wheel crosses over the lane marker.

    2. Vehicle sway warning function:


      1. A warning is output when any of the following occurs:


        • The vehicle repeatedly deviates from its lane.

        • The vehicle drifts within its lane when the driver is inattentive.

  6. FUNCTION OF COMPONENTS

    COMPONENTS FUNCTION
    Forward Recognition Camera

    • Detects lane markers and objects on the road ahead using the image captured by the monocular camera and generates information about the road

    • Sends request signals to the combination meter assembly to display lane departure alert indicators and messages and sound the meter buzzer
    Lane Departure Alert Main Switch Turns on/off the lane departure alert system
    Combination Meter Assembly

    • Displays messages on the multi-information display and turns on lane departure alert indicators based on request signals from the forward recognition camera

    • Sounds the meter buzzer based on request signals from the forward recognition camera

    • Sends meter tolerance and turn signal switch operation signals to the forward recognition camera
    Steering Angle Sensor (Spiral with Sensor Cable Sub-assembly) Sends the turning angle of the steering wheel to the forward recognition camera
    Skid Control ECU (Brake Actuator Assembly) Sends the wheel speed, yaw rate zero point, brake operation status and other information to the forward recognition camera
    Yaw Rate and Acceleration Sensor (Airbag Sensor Assembly) Sends signals received from the yaw rate sensor to the forward recognition camera
    Millimeter Wave Radar Sensor Assembly Sends the preceding pre-collision system operation conditions to the forward recognition camera
    Network Gateway ECU Gateway function of CAN communication

  7. SYSTEM INOPERATIVE CONDITIONS


    1. The lane departure alert system may not operate in any of the following conditions:


      • When driving through an area with no lane markers or such as a tollbooth

      • When lane markers are obscured or cannot be recognized due to backlight, bad weather or standing water

      • When driving in a location where the light level changes rapidly, such as the entrance to or exit from a tunnel

      • When the tires are excessively worn or the tire inflation pressure is insufficient

      • When non-standard tires are used (incorrect tire size or tire maker)

      • When winter tires or a spare tire is used

      • When a non-standard suspension is installed

      • When the road is partially covered in snow

      • When there are shadows on the road running parallel with the lane markers

      • When the lane markers are Bott's dots (raised pavement markers), stone, etc.

      • When there are markings on the road due to road repairs, etc.

      • When driving through a road construction area

      • When turning a sharp corner

      • When driving on a road that is branching or merging

      • When a lane is extremely narrow or wide

      • When driving on a particularly bright road surface, such as concrete

      • When driving on a road surface that is bright due to reflected sunlight or the headlights of oncoming vehicles

      • When driving on a road surface that is wet due to rain, standing water, etc.

      • When driving on a winding or uneven road

      • When the distance between the vehicle and the preceding vehicle is extremely short

      • When the vehicle experiences strong up-and-down motion such as when driving over a joint in the road surface or on an extremely rough road