Object Detection Description and Operation (Lane Departure Warning)
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Object Detection Description and Operation (Lane Departure Warning)
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The lane departure warning system is a convenience feature that issues a warning when the system detects that the vehicle has unintentionally crossed a lane marking. The lane departure warning system is controlled by a camera located behind the windshield which looks out at the road ahead and detects any lane markings. When the vehicle unintentionally leaves a detected lane, a visual and audible alert is given to the driver.
The lane departure warning system is made up of the following components:
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Vehicle direction camera control module
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Lane departure warning switch
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Instrument Panel Cluster
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Vehicle Direction Camera Control Module
The camera detects visual queues such as lane markings and curbs. When it is determined that the vehicle has unintentionally moved outside of the lane, a visual and audible warning is given to the driver. The vehicle direction camera control module receives an input from the lane departure warning switch and controls the lane departure warning LED output. The vehicle direction camera control module also communicates via serial data with the instrument cluster and radio to request visual and audible alerts.
Lane departure warning switch
The lane departure warning switch provides an input to the vehicle direction camera control module to turn the lane departure warning system ON and OFF. The lane departure warning switch is part of the multifunction switch at the instrument panel. The vehicle direction camera control module provides a signal voltage to the normally open momentary switch. When the switch is pressed, the signal circuit is pulled to ground, indicating to the vehicle direction camera control module that the system has been request to turn ON or OFF. The lane departure warning switch also contains the lane departure warning LED, which is controlled by the vehicle direction camera control module to indicate the ON and OFF status of the lane departure warning system. When the system is has been enabled by the lane departure warning switch, the vehicle direction camera control module applies ground to the switch indicator and illuminating the LED.
Instrument Panel Cluster
The instrument cluster contains the green and amber land departure warning indicators. These indicate to the driver the current status of the lane departure warning system and are controlled via serial data by the vehicle direction camera control module. When the system has detected the required lane markings and is ready to assist, the green indicator will be illuminated on the instrument cluster. If the vehicle has unintentionally left the lane, the amber indicator will flash.
Radio
The radio controls the audible alert for the lane departure indicator. If the vehicle has unintentionally left the lane, the radio will command 3 beeps as an audible alert to the driver.
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Lane Departure Warning Operation
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System operation can be describe by the following modes:
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Disabled: The system has disabled by the operator, using the lane departure warning switch. The lane departure warning LED will not be illuminated.
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Not Ready To Assist: The system is enabled and the lane departure warning LED is illuminated, but not ready to assist when any of the following conditions is true:
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Vehicle speed is less than 56 km/h (35 MPH) or vehicle speed has dropped below 48 km/h (30 MPH) when the system initially was in the ready to assist mode. The system is designed to function at speeds greater than 56 km/h (35 MPH).
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The system cannot detect lane markings. This may be because there are no lane markings, as on a country road or that the lane markings cannot be determined due to snow, rain, or other driving conditions.
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The windshield area in front of the camera or the camera lens is blocked by fog, dirt, damage to the windshield or other elements that may prevent the camera from detecting lane markings.
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Ready To Assist: The system is enabled and ready to warn of the unintentional lane crossing. The system is ready to assist when the green lane departure warning indicator is illuminated on the instrument cluster.
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Lane Crossing Alerts
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When one of the following conditions are met within the last 3 s, the system will not give alerts:
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The correct turn signal is activated. An activated turn signal is interpreted as an intentional lane crossing.
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The operator makes a sharp maneuver.
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The operator makes a significant acceleration change or significant steering change during a lane crossing.
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The operator pushes the brake pedal.
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An intentional lane crossing is done.
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Lane crossing alert consists of the following:
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Three chimes are activated through the radio.
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The amber lane departure warning indicator will flash.
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Lane Departure Warning System Driver Information Center Messages
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The vehicle direction camera control module system commands the driver information center to display the following messages to alert the driver of a system concern or status information:
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LANE DEPARTURE SYSTEM UNAVAILABLE
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SERVICE LANE DEPARTURE SYSTEM
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