LANE DEPARTURE ALERT SYSTEM SYSTEM DESCRIPTION


  1. LANE DEPARTURE ALERT SYSTEM DESCRIPTION


    1. When the vehicle is being driven on a highway or other roads, the lane departure alert system recognizes white (or yellow) line markers and determines the position of the vehicle within the lane using the forward recognition camera and millimeter wave radar sensor assembly. If the system judges that the vehicle may deviate from the lane it is in, the system sounds a buzzer and illuminates the lane departure alert indicator in the combination meter display.

  2. SYSTEM SPECIFICATION

    Operation speed Lane departure alert function Between approximately 50 and 270 km/h (32 to 168 mph)
    Vehicle sway warning Between approximately 50 and 200 km/h (32 to 124 mph)
    Operation lane width More than approximately 3 m (10 ft.)
    Operation curve radius More than approximately 150 m (493 ft.)

  3. OPERATING CONDITIONS


    1. Base Conditions:


      • 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.

      • Steering sensor zero point correction is complete.

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


      • The base conditions are met.

      • The lane departure alert main switch (steering pad switch assembly) is turned on.

      • The turn signal switch is off

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


      • The base conditions are met.

      • "Sway Warning" on the settings screen on the multi-information display is set to "On".

  4. CONTROL OF EACH FUNCTION


    1. Lane departure alert function:


      1. Sensitivity: "Standard"

        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. Sensitivity: "High"

        A warning is provided when a front wheel nears a lane marker.

        Tech Tips

        When the deviation speed (lateral travel speed) is slow, the warning may be provided when the front wheel starts to cross the lane marker.

    2. Vehicle sway warning:


      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

        • After steering wheel inputs from an inattentive operation decrease, the steering wheel is turned abruptly.

  5. 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 lane departure alert buzzer (meter buzzer)

    • Stores customize settings information
    Lane departure alert main switch (Steering Pad Switch Assembly) Turns on/off the lane departure alert system
    Function Switch (Steering Pad Switch Assembly) Changes the customize settings of the lane departure warning function and vehicle sway warning function
    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 lane departure alert buzzer (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

    • Sends customize settings information to the forward recognition camera
    Steering Sensor Sends the turning angle of the steering wheel to the forward recognition camera
    Driving Support ECU Assembly

    • Sends the current status of the lane departure alert main switch (steering pad switch assembly) to the forward recognition camera

    • Sends a buzzer request signal for the pre-crash safety system and dynamic radar cruise control system to the forward recognition camera
    Skid Control ECU (Brake Actuator Assembly*1 or Master Cylinder Solenoid*2) Sends the wheel speed, yaw rate zero point, brake operation status and other information to the forward recognition camera
    Yaw Rate Sensor (Airbag Sensor Assembly) Sends signals received from the yaw rate and acceleration sensor to the forward recognition camera
    ECM Sends the accelerator pedal opening angle signal to the forward recognition camera
    Millimeter Wave Radar Sensor Assembly Sends the preceding vehicle information to the forward recognition camera
    Main Body ECU (Multiplex Network Body ECU) Sends the country specification information to the forward recognition camera
    Network Gateway ECU Gateway function of CAN communication

    • *1: for 2TR-FE

    • *2: except 2TR-FE

  6. 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

      • The vehicle is extremely tilted due to carrying heavy luggage or having improper tire pressure