Lane Departure Warning
OPERATING CONDITIONS
- The vehicle speed must exceed 60 km/h (37 mph) and must not drop below 55 km/h (34 mph).
- The lane markings must be visible.
- The turn signal indicator must not be active.
- Lane departure is very rapid not allowing the Forward Facing Camera (FFC)/HALF module the proper time to alert the driver.
The system must detect the lane that the vehicle is travelling in. According to this information, the LDW warns the driver if the vehicle is nearing the edge of the lane involuntarily.
LANE DETECTION
This system must detect lanes marked by white or yellow, continuous or broken, single or double lines, with standard thickness and configuration.
The LDW system detects the lanes when:
- The field of vision is greater than 15 meters (50 ft.)
- The curvature radius of the road is greater than 125 meters (410 ft.)
- The absolute value of road inclination is lower than 5°
- The width of the lane is greater than 3 meters (10 ft.) and lower than 4.5 meters (15 ft.)
WARNING AREAS
The LDW system warning strategy considers the area around the lane boundaries. Consequently, when the outer part of the vehicle's front wheel enters this area, the system will request the activation of the warning.
Frontal view of warning area.
LDW FEEDBACK
The system status can be viewed directly on the Instrument Panel Cluster (IPC) through two warning light indicators.
- Both warning lights are on: the system can't provide a warning since at least one of the conditions necessary for operation has not been met (e.g. lines not visible).
- Both warning lights are off: the system is not active or is active and awaiting indications to provide concerning the proximity of the right or left lane.
- Left or right warning light on: left or right warning active
- Both left and right lights are on constantly or a red icon in on the display: this indicates the LDW system itself is inoperative and needs to be serviced.
The LDW system also provides a haptic feedback felt in the steering wheel by way of the Electronic Power Steeping (EPS) gear. When parameters are met that indicate that the vehicle is unintentionally drifting towards a lane marker, the EPS provides the torque overlay.