LANE DEPARTURE ALERT SYSTEM(w/ Steering Control) SYSTEM DESCRIPTION


  1. LANE DEPARTURE ALERT SYSTEM DESCRIPTION (w/ Steering Control)


    1. When the vehicle is being driven on a highway or other roads, the lane departure alert system (w/ Steering Control) 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, illuminates the lane departure alert indicator in the combination meter display, performs steering assist and vibrates the steering wheel so that the driver can take action to avoid lane departure.

  2. FUNCTION DESCRIPTION


    1. The following functions are performed according to the customize settings.

      FUNCTION DESCRIPTION
      Lane departure warning 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.
      LDA steering control 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 performs steering assist to help the driver correct the path of the vehicle.
      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 illuminates the lane departure alert indicator in the combination meter display to inform the driver to stop and take a rest.

      Tech Tips


      • The customize settings can be changed using the lane departure alert main switch of the steering pad switch assembly or function switch on the multi-information display.

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

  3. LANE DEPARTURE ALERT SYSTEM OPERATION (w/ Steering Control)


    1. Lane departure warning function


      1. Lane departure warning function operation conditions

        The lane departure warning function operates when all of the following conditions are met:


        • The lane departure alert main switch is turned on.

        • The vehicle speed is between approximately 50 and 270 km/h (31 to 168 mph).

        • The vehicle is driving in a lane with a width of approximately 2.5 m (8.2 ft.) or more.

        • The vehicle is driving on a straight road or a road with a slight curve (approximately 100 m (328.1 ft.) or more in radius).

        • Lane markers are detected.

        • The turn signal switch is off.

        • The lane departure alert system (w/ steering control) has no malfunctions.

      2. Operation of lane departure warning function


        1. Sensitivity: Normal

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

      3. Interruption/return conditions of lane departure warning function

        Interruption Condition Return Condition
        Vehicle speed is outside the system operation range Vehicle speed is within the system operation range
        The turn signal switch is operated The turn signal switch is off
        Lane markers are not detected Lane markers are detected
        After a lane departure warning has been output The vehicle moves back into its lane after a warning was output

      4. Suspension/restart conditions of Lane departure warning function

        Suspension Condition Return Condition
        The lane departure alert main switch is turned off The lane departure alert main switch is turned on
        System operation is interrupted The system returns to normal
        The system is malfunctioning The power switch is turned on (IG) and normal system operation is confirmed

    2. LDA Steering Control Function


      1. Operation conditions of LDA steering control function

        The LDA steering control function operates when all of the following conditions are met:


        • All operation conditions for the lane departure warning function are met.

        • LDA steering assist has been turned on using the steering pad switch assembly.

        • The vehicle is driving in a lane with a width of between approximately 2.5 m (8.2 ft.) and 4.3 m (14.1 ft.).

        • The vehicle is not changing lanes (steering wheel not turned).

        • The VSC system, pre-crash safety system or other vehicle safety system is not operating.

        • The accelerator pedal is not depressed.

        • The steering wheel is securely held.

      2. Operation of LDA steering control function


        • When LDA steering assist is turned on, the system alerts the driver using the lane departure warning function and performs steering assist to help the driver correct the path of the vehicle.

        • If the system judges that the vehicle may deviate from the lane it is in when the lane departure warning function is operating, the system sounds a buzzer, illuminates the lane departure alert indicator in the combination meter display and performs steering assist.

      3. Interruption/return conditions of LDA steering control function

        Interruption Condition Return Condition
        The steering sensor or airbag sensor assembly (yaw rate and acceleration sensor) is malfunctioning The malfunctioning sensor returns to normal
        The vehicle is turning a corner (steering wheel turned) A certain period of time has elapsed since the vehicle turned a corner (steering wheel turned)
        A certain amount of deceleration is detected A certain amount of deceleration has not detected for a certain period of time
        The VSC system, pre-crash safety system or other vehicle safety system is operating A certain amount of acceleration has not detected for a certain period of time
        The steering wheel is not securely held The steering wheel is securely held

      4. Suspension/return conditions of LDA steering control function

        Suspension Condition Return Condition
        The lane departure alert main switch is turned off The lane departure alert main switch is turned on
        System operation is interrupted The system returns to normal
        The system is malfunctioning The power switch is turned on (IG) and normal system operation is confirmed
        The power switch is turned off The engine is started and the lane departure alert main switch is turned on
        LDA steering assist is tuned off using the steering pad switch assembly LDA steering assist is tuned on using the steering pad switch assembly

    3. Vehicle Sway Warning Function


      1. Operation conditions of vehicle sway warning function

        The vehicle sway warning function operates when all of the following conditions are met:


        • The vehicle sway warning function has been turned on using the steering pad switch assembly.

        • The vehicle speed is approximately 50 km/h (31 mph) or more.

        • The lane departure alert system (w/ steering control) has no malfunctions.

      2. Operation of vehicle sway warning function

        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.

        • The steering wheel is turned abruptly when the driver is inattentive.

      3. Interruption/return conditions of vehicle sway warning function

        Interruption Condition Return Condition
        Vehicle speed is outside the system operation range Vehicle speed is within the system operation range
        The turn signal switch is operated The turn signal switch is off
        Lane markers on both or either side of the lane cannot be detected Lane markers on both sides of the lane are detected

      4. Suspension/restart conditions of vehicle sway warning function

        Suspension Condition Return Condition
        The lane departure alert main switch is turned off The lane departure alert main switch is turned on
        System operation is interrupted The system returns to normal
        The system is malfunctioning The power switch is turned on (IG) and normal system operation is confirmed
        The vehicle sway warning function is tuned off using the steering pad switch assembly The vehicle sway warning function is tuned on using the steering pad switch assembly

  4. 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 a steering assist request signal to the power steering ECU assembly

    • Sends request signals to the combination meter assembly to display lane departure alert indicators and messages and sound the LDA buzzer

    • Stores customize settings information
    Steering Pad Switch Assembly (Lane Departure Alert Main Switch) Turns on/off the lane departure alert system (w/ Steering Control)
    Steering Pad Switch Assembly (Function Switch) Changes the customize settings of the lane departure warning function, LDA steering control 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 LDA 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
    Power Steering ECU Assembly

    • Controls the power steering motor and performs steering assist based on signals received from the forward recognition camera

    • Sends steering torque signals from the torque sensor to the power steering motor

    • Sends steering wheel operation signals to the forward recognition camera

    • Cancels steering assist when an abnormal torque request signal is received from the forward recognition camera
    Steering Wheel Assembly (Steering Vibration ECU) Operates the eccentric rotating mass vibration motor in the steering wheel assembly to produce steering vibrations based on request signals from 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 steering pad switch assembly (lane departure alert main switch) 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
    Brake Booster with Master Cylinder Assembly (Skid Control ECU) Sends the wheel speed, yaw rate zero point, brake operation status and other information to the forward recognition camera
    Airbag Sensor Assembly (Yaw Rate and Acceleration Sensor) Sends signals received from the yaw rate and acceleration sensor to the forward recognition camera
    Hybrid Vehicle Control ECU Assembly 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
    Central Gateway ECU Gateway function of CAN communication

  5. SYSTEM INOPERATIVE CONDITIONS


    1. The lane departure alert system (w/ Steering Control) may not operate in any of the following conditions:


      • When driving through an area with no lane markers, such as a tollbooth, a crossing or before a ticket checkpoint

      • 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 snow is piled up on the side of the road

      • 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