Object Detection Description and Operation (UFL)

Object Detection Description and Operation (UFL)

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 leaves a detected lane without using a turn signal, a visual and audible alert is given to the driver.

The lane departure warning system is made up of the following components:

* Vehicle direction alert alarm warning module (VDAAW)
* Lane departure warning switch
* Instrument panel cluster (IPC)
* Radio

Vehicle Direction Alert Alarm Warning Module

The vehicle direction alert alarm warning module (VDAAW) controls the lane departure warning system based on the visual inputs received by the camera, which is part of the VDAAW. The camera detects visual queues such as lane markings, curbs, guard rails, and fences. 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 VDAAW receives an input from the lane departure warning switch and controls the lane departure warning LED output. The VDAAW also communicates via serial data with the instrument panel cluster (IPC) and radio to request visual and audible alerts.

Lane Departure Warning Switch

The lane departure warning switch provides an input to the VDAAW to turn the lane departure warning system ON or OFF. The lane departure warning switch is part of the headlamp switch assembly. The VDAAW 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 VDAAW that the system has been requested to turn ON or OFF.

The lane departure warning switch also contains the lane departure warning LED, which is controlled by the VDAAW to indicate the ON and OFF status of the lane departure warning system. When the system has been enabled by the lane departure warning switch, the VDAAW applies 12 volts, illuminating the LED.

Instrument Panel Cluster

The instrument panel cluster (IPC) 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 VDAAW. When the system has detected the required lane markings and is ready to assist, the green indicator will be illuminated on the IPC. 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.

System Operation

System operation can be described by the following modes:

* Disabled: The system was disabled by the operator, using the lane departure warning switch. The lane departure warning LED will not be illuminated.
* 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:

- Vehicle speed is less than 35 mph or vehicle speed has dropped below 30 mph when the system was in the ready to assist mode. The system is designed to function at speeds greater than 35 mph.
- 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.
- 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.

* 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 IPC.

Lane Crossing Alerts
* The system will not give alerts under the following conditions:

- The correct turn signal is activated. An activated turn signal is interpreted as an intentional lane crossing.
- The operator makes a sharp maneuver.
- The operator makes a significant acceleration change or significant steering change during a lane crossing.

* Lane crossing alert consists of the following:

- Three chimes are activated through the radio.
- The amber lane departure warning indicator will flash.

Lane Departure Warning System DIC Messages

The VDAAW system commands the DIC to display the following messages to alert the driver of a system concern or status information:

* LANE DEPARTURE SYSTEM UNAVAILABLE
* SERVICE LANE DEPARTURE SYSTEM