Lane departure warning system
The lane departure warning (also Lane Assistant, Eng. Lane departure warning system ( LDW) ) warns the driver of a vehicle before leaving the lane on a road. Here, different optical systems and computers in use, by means of which the position of the vehicle is determined in the lane. The system warns of falling below the distance to the lane marker ( distance-to- line crossing criterion ( DLC) ) and if this falls below using the Time to Line Crossing criterion (TLC) predict.
Technical implementation
Automatic lane detection may be implemented in various ways.
LKAS - Lane Keep Assist System
The system determines the lane via a mounted behind the windshield CMOS camera. Then from the recorded images, it determines the optimal steering angle in order to keep the vehicle in the middle of the lane. The steering angle is composed of a minimum of 20 % human input and a maximum of 80 % of the input power steering. If the vehicle in front is about to cross the road markings, a warning beep or a rattling noise is expelled or displaced the steering wheel to vibrate. The following conditions must be met:
- Driver has contact with the steering wheel
- Turn signals are not active
- The driver's steering force exerted motion does not indicate a lane change
Can the LKAS no feedback from the driver recognize (hands longer than 20 s not on the steering wheel ), it switches off automatically.
The first production vehicle in which the system was available, the Nissan Cima in the Japanese market from 2001 with the Lane Keeping Assist ( LKAS ).
LKAS is installed in the Inspire since 2003. Furthermore, there are LKAS Accord model " 2.4 AT Executive " of the model year 2006 and in the Legend starting from 2006. Both the latter models until further notice only in their right-hand drive version.
Lane Assist
Lane Assist is the related Audi system that continually draws on the other hand, when the system detects an unintentional lane departure. Lets the driver turns the steering wheel going on, so after about 8 to 10 seconds, the system, after prior warning, turned off to avoid that the driver gives up its active role.
Lane Guard System
When Lane Guard System of MAN, a camera system can detect the lane and optionally creates an acoustic warning by " washboard " in the speakers.
LDWS - Lane Departure Warning System
The used of VicoVation LDWS - lane assist is integrated in a Dashcam. With their car trips are recorded on video. It also enables a cost upgrade version of a LDWS and FCWS system (English Front Collision Warning System ) for older vehicles. The LDWS system itself is based on image processing technology. The vehicle position is continuously calculated and controlled in relation to the lane markings. If a crossing of the lane marking, the driver is warned acoustically via a beep or voice announcement.
AFIL - Alarm for lane departure by infrared line detection
When AFIL system of the system manufacturer Valeo infrared sensors are mounted on the underbody of the vehicle. The warning happens on the relevant side of the driver's seat, through the use of two vibration motors. For this, the indicator must not be active, and the speed of the vehicle must not be less than 70 km / h. Such a system is available for Citroën C4, Citroën C5 and Citroen C6.
Other systems
In systems from Bosch and Continental a small camera is mounted behind the windscreen ( usual position of the rain sensor ). This detects road boundaries and unpaved roadsides on branch lines.
The new Volkswagen CC a similar system with the name " Lane Assist " is offered.
In trucks, such systems are available as an accessory (surcharge ); for example, provide Daimler and Iveco to this system. There is also a proximity warning is available.
Lane Keeping
The Lane Keeping Support (English: lane keeping support, heading control) supports the driver by automated permanent co-steering while tracking.