FORWARD SENSING CAMERA (FSC)

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Purpose

Function

Note

•  In the following cases, the FSC may not be able to detect target objects correctly.

―  Under bad weather condition, such as rain, fog and snow.

―  The window washer is being used or the windshield wipers are not used when it's raining.

―  Ice, fog, snow, frost, rainfall, dirt, or foreign matter such as a plastic bag is stuck on the windshield.

―  Trucks with low loading platforms and vehicles with an extremely low or high profile.

―  When driving next to walls with no patterning (including fences and longitudinally striped walls).

―  The taillights of the vehicle ahead are turned off.

―  A vehicle is outside the illumination range of the headlights.

―  The vehicle is making a sharp turn, or ascending or descending a steep slope.

―  Entering or exiting a tunnel.

―  Heavy luggage is loaded causing the vehicle to tilt.

―  Strong light is shone at the front of the vehicle (back light or high-beam light from on-coming vehicles).

―  There are many light emitters on the vehicle ahead.

―  When the vehicle ahead is not equipped with taillights or the taillights are turned off at nighttime.

―  Elongated luggage or cargo is loaded onto installed roof rails and covers the FSC.

―  Exhaust gas from the vehicle in front, sand, snow, and water vapor rising from manholes and grating, and water splashed into the air.

―  When towing a malfunctioning vehicle.

―  The vehicle is driven with tires having significantly different wear.

―  The vehicle is driven on down slopes or bumpy roads.

―  There are water puddles on the road.

―  The surroundings are dark such as during the night, early evening, or early morning, or in a tunnel or indoor parking lot.

―  The illumination brightness of the headlights is reduced or the headlight illumination is weakened due to dirt or a deviated optical axis.

―  The target object enters the blind spot of the FSC.

―  A person or object bursts onto the road from the shoulder or cuts right in front of you.

―  You change lanes and approach a vehicle ahead.

―  When driving extremely close to the target object.

―  Tire chains or a temporary spare tire is installed.

―  The vehicle ahead has a special shape. For example, a vehicle towing a trailer house or a boat, or a vehicle carrier carrying a vehicle with its front pointed rearward.

Light-emitting object (on-coming vehicle, vehicle ahead, street lights) recognition function

•  Analyzes the light-emitting object picked up by the camera, and recognizes it as an on-coming vehicle, vehicle ahead, or street lights (traveling on town/city streets).

On-coming vehicle recognition function

•  The forward sensing camera (FSC) recognizes a light-emitting object which meets any of the following conditions and is at least within 600 m {23,622 in} from the detecting vehicle as an on-coming vehicle.

―  Light-emitting object approaches having brightness of specified value or more

―  Light-emitting object approaches having white color and certain level of brightness or more (if it approaches and brightness changes, determination made at point of image capture)

Note

•  If the on-coming vehicle and the surrounding conditions are as follows, the forward sensing camera (FSC) may require time until it recognizes an on-coming vehicle.

―  Poor visibility due to rain and fog

―  On-coming vehicle is travelling with only TNS or fog lights

―  Brightness of light source is low, such as a bicycle

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―  Red light emitted from light-emitting object is detected

―  Determines that there is a pair of light-emitting objects

Note

•  To make the prevention of dazzling of other vehicles a priority, the system could recognize reflecting objects on the road surface or a guard rail as a vehicle ahead (switches headlights to low beams).

•  If visibility is poor due to rain or fog, the system may not recognize a vehicle ahead even though one may exist (maintains headlight high beams).

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―  Several light-emitting objects of certain height or more from road surface along same line are detected

―  Camera image gray color is certain level or more

Note

•  Even during travel other than on town/city streets at night, if the road surface is bright from moonlight, the system may recognize that the vehicle is traveling on town/city streets (switches headlights to low beams).

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Vehicle lane lines and travel lane recognition function

•  The forward sensing camera (FSC) recognizes lineal objects which are white/yellow and paler than the surrounding color as vehicle lane lines by the contrast (color density) of the camera image.

•  If the vehicle lane lines are continuous they are recognized as actual lines, if discontinuous they are recognized as broken lines.

•  The travel lanes recognized from the vehicle lane lines on the left and right of the vehicle are used to calculate the width.

•  Traveling in a straight line or cornering is determined by the status of the vehicle lane lines.

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LDWS warning-trigger line setting function

•  The forward sensing camera (FSC) sets the lane departure warning system (LDWS) warning-trigger lines^*1 at approx. 5 cm {2 in} inside of the recognized vehicle lane lines.

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•  If there is only one vehicle lane line or only one vehicle lane line can be recognized, the warning-trigger line is set to only the recognized vehicle lane line.

•  If a broken line and solid line are both recognized, the solid line is given priority to be set to the warning-trigger line.

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LDWS warning-trigger line auto-adjust function

Note

•  The LDWS warning-trigger line auto-adjust function operates when “Adaptive” is selected using the personalization feature, which can be used to change the distance between the lane departure warning system (LDWS) vehicle lane lines and the warning-trigger lines. Refer to the [INSTRUMENTATION/DRIVER INFO. PERSONALIZATION ] for details on personalization features. (See INSTRUMENTATION/DRIVER INFO. PERSONALIZATION.)

•  After the vehicle is driven for a certain period of time or more during 1 drive-cycle^*1, the forward sensing camera (FSC) automatically adjusts the lane departure warning system (LDWS) warning-trigger lines to control unnecessary warnings under the following conditions.

―  Vehicle is driven close to vehicle lane line for continuous period of time or longer due to particular driver characteristic.

―  Width of travel lane recognized by the forward sensing camera (FSC) is decreased from a constant width

―  The travel lane recognized by the forward sensing camera (FSC) is curved a certain value or more, and the vehicle is determined to be traveling on curved roads (out-in-out travel).

•  After the vehicle is driven for a certain period of time or more during 1 drive-cycle^*1, the forward sensing camera (FSC) automatically adjusts the lane departure warning system (LDWS) warning-trigger lines according to the change in the width of the travel lane such that the travel lane recognized by the forward sensing camera (FSC) is wider than the certain width.

•  The forward sensing camera (FSC) automatically adjusts the warning-trigger line within the range between the outer side of the vehicle lane line and approx. 10 cm {3.9 in} inward from the warning-trigger line set prior to the adjustment.

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•  The forward sensing camera (FSC) automatically adjusts the set warning-trigger lines within the adjustment range in the following cases:

Detection state	Adjustment
A condition in which distance between vehicle and vehicle lane line recognized by forward sensing camera (FSC) is closer than specified value (such as driving close to either side continuously) is continuously detected for a certain period of time.
Recognized travel lane width decreases to certain width or less
Recognized vehicle lane line is curved a certain value or more and the vehicle is determined to be traveling on curved roads (out-in-out travel)
Width of recognized travel lane is wider than certain width

Aiming correction function

•  The forward sensing camera (FSC) adjusts the camera shot angle by aiming, and stores the vanishing point^*1. The stored vanishing point and the current vanishing point are compared and if there is a deviation of a certain value or more in the vanishing point, the current vanishing point is stored as the new vanishing point.

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HBC warning light (amber), LDWS OFF indicator light, and LDWS warning light burnt out bulb check function

•  When the ignition is switched ON (engine off or on), the instrument cluster turns the HBC warning light (amber), LDWS OFF indicator light, and LDWS warning light on for approx. 3 s to check for burnt out bulb.

On-board diagnostic function

•  The forward sensing camera (FSC) detects dirt and fogging of the camera lens and windshield glass, forward sensing camera (FSC) communication errors, forward sensing camera (FSC) internal malfunctions, and outputs DTCs. For details on DTCs, refer to [ON-BOARD DIAGNOSTIC [FORWARD SENSING CAMERA (FSC)]]. (See ON-BOARD DIAGNOSTIC [FORWARD SENSING CAMERA (FSC)].)

Construction

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Note

•  If there is damage or cracking in the windshield glass repair prohibited area, replace the windshield. If the damage or cracking in the windshield glass repair prohibited area is repaired, it could affect the recognition of the Forward Sensing Camera (FSC) and the system may not operate normally.

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Operation

Camera range

•  The forward sensing camera (FSC) shoots in the following range.

Note

•  Depending on the surrounding conditions (ascending roads, winding roads, walls), the forward sensing camera (FSC) may be unable to pickup an object in front of the vehicle within the camera range and not recognize it as a controlled target object.

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Position calculation

•  When an object appears on the screen, the forward sensing camera (FSC) determines the position coordinates and calculates the direction and distance to the object.

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Fail-safe