Lane departure warning

The Lane Departure Warning (LDW) is a driver assistance system that warns drivers when their vehicle unintentionally drifts towards the lane lines by using a visual warning icon, a warning sound or haptic steering wheel feedback by vibrating the steering wheel. As a non-autonomous system, this feature does not actively intervene in the dynamic driving task.

The camera recognizes the lane marking and road edges and estimates the position of the vehicle within lane. The LDW system then uses this information to provide a visual/audible/haptic warning to the driver in case of unintentional lane departure.

When "Lane Departure Warning" is activated, the system working speed range is from 60-150 kph.

The system is disabled when one of the following conditions are met:

• Vehicle speed is less than 60 kph or exceeds 150 kph;
• Driver turns the indicator on during lane departure;
• System has lost lane marking;
• Another active safety system of the vehicle is in intervention;
• Lane width exceeds 4.5 m or is below 2.5 m - still active when vehicle is getting closer to the lane or lane is smaller than 2.5 m, system changes to standby mode;
• Vehicle crosses latest warning line; or
• System failure occurs.

When the "Lane Departure Warning" (LDW) is activated, ADAS receives information on the following:

• An activated turn signal;
• The yaw rate;
• The vehicle speed;
• The gear engaged; and
• The steering wheel angle.

The camera provides information on the lane markings and the position of the vehicle within the lane. If the ADAS detects the vehicle approaching one of the lane marking, the color of the lane limit changes to red, and at the same time a command is issued to the Electrical Power Steering for a haptic warning. The system issues a warning message via the Multimedia Head Unit (MHU).

System Architecture 

Courtesy of VINFAST, LLC

IDB - Integrated Dynamic Brake

BCM - Body Control Module

EPS - Electrical Power Steering

PWT - Powertrain

MHU - Multimedia Head Unit (MHU)/Multimedia Display Unit (MDU)/HMI

HMI state flow 

Courtesy of VINFAST, LLC

Courtesy of VINFAST, LLC

OFF: No lane marking

ON: No lane detected (standby mode): No lane marking

1. Lanes detected: lane marking grey
2. Limit of the warning area crossed: lane marking turns from grey to redimit of the warning area crossed: lane marking turns from grey to red
3. No intervention by the driver, risk of lane departure detected sound warning and haptic action on steering wheel
4. Pop-up warning message
5. Vehicle crossed the lane marking
6. Pop-up warning message
7. Sound warning and haptic action on steering wheel