Lane Departure Warning System: Operation
Input/output:
- Adaptive Cruise Control Plus (ACC+)
- FCW+ function status
- Data on video objects
- Instrument Panel Cluster (IPC)
- Status, DTC, LDW function configuration and buzzer
- Body Control Module (BCM)
- LDW function ON/OFF switch
- Status of LDW function LED
- Brake pedal status
- Direction indicator status
- Vehicle speed
- Status of acoustic warning for hands on the steering wheel
- Occupant Restraint Controller (ORC)
- Side acceleration value
- ABS/ESC
- ABS / ESC status
- Electric Power Steering (EPS)
- Steering angle
- Torque applied to the steering wheel
- Center Stack Switch (CSS)
- LDW activation/deactivation
- Low-Level Telematics Module (LTM) / Entertainment Telematics Module (ETM) / High-Level Telematics Module (HTM)
- Audio signal for hands on the steering wheel LDW configuration status
- Radio Receiver Module (RRM)
- Buzzer
LDW+ is a warning system which notifies the driver if they cross lanes, assisting the driver when distracted. A video sensor, on the windshield near the interior rear view mirror, detects horizontal road signs and the position of the vehicle in relation to them. If the vehicle is travelling in the middle of the lane then the system does not intervene.
If, on the other hand, the vehicle gets close to the edge and the direction indicator is not operated, a slight torque is applied to the steering wheel making the driver aware of what is happening. The driver maintains full control of the vehicle and there is a great benefit in terms of safety.
The system is not on when the vehicle is started. The system can be partially activated or deactivated via a button located in the ICS switch pod. When activated, the system starts recognizing operating conditions, a condition signaled to the driver by the flashing icon on the instrument panel display. The system can be switched off automatically in the following conditions:
- The driver does not keep their hands on the steering wheel: the corresponding indication is shown on the instrument panel and after a few seconds a buzzer sounds until the driver places their hands back on the wheel. This is considered a dangerous condition and the system is automatically deactivated;
- Intervention of vehicle safety systems (ABS, Advanced Speech Recognition (ASR) and EPS). The automatic switching off is signaled to the driver by three consecutive acoustic warnings and the message in the instrument panel display.
The video sensor that manages the lane departure warning function has an ignition-controlled power supply provided from a circuit protected by a fuse located in the BCM. The FFC is connected, via the CAN bus to the BCM and to the IPC to manage the "lane departure warning on" warning light and failure signals. The FFC is also connected to the ACC module, with a dedicated CAN bus.
The lane departure warning control button, located in the switch pod, sends the activation signal via LIN bus to BCM.