Attention Monitoring, Basic Function - GF54.30-S-9900A
Model All (Light transporter)
Overview
This document contains information on:
- General
- Function requirements
- Function
- Functional restrictions
General
Attention monitoring can recognize typical signs of fatigue and lack of attention by the driver. It is active in a vehicle speed range from 60 to 200 km/h. If there are indications of fatigue or inattentiveness from the driver, the system warns the driver and prompts them to take a break.
Development of attention monitoring is based on experiences gained from test subjects whose different driving behavior was evaluated in daytime and at night.
On vehicles with microsleep event detection, additional driver signs such as facial expressions and blinking are recorded using the driver camera. The system optically and acoustically warns the driver via microsleep warning and attention monitoring in the event of an imminent microsleep event (long blink).
Function requirements
- Engine in operation or drivetrain operational
- Vehicle in forward travel
Function
Attention monitoring evaluates driver fatigue and inattentiveness by analyzing their steering ability while taking the driving environment into account. In the first 20 min of the journey, the system identifies individual parameters and creates a driver profile.
The system warns the driver optically and acoustically if it determines during the journey that there are deviations from this profile that suggest fatigue or inattentiveness. The driver must acknowledge the microsleep event warning tone.
The driving behavior of the driver is also analyzed when attention monitoring is switched off. Even if the system is only switched on during the journey, the complete journey from start is taken into consideration.
The microsleep event detection subfunction is only available in combination with the driver camera.
Essentially, the following influencing factors are evaluated:
- Time of day
- Driving time and speed
- Steering movements
- Vehicle longitudinal and lateral acceleration as well as yaw rate
- Control interventions by the driver, e.g. on the multimedia system or on the on-board computer
- Analysis of the driver's eye behavior and blink pattern using the driver camera in the driver display (only with microsleep event detection)
The time of day is checked for plausibility via the ambient brightness. In the event of a twilight transition implausible for the time of day, an entry is made in the diagnostic memory.
If the analysis of the evaluation criteria reveals certain steering and behavior patterns that frequently occur in the event of fatigue, the system prompts the driver to take a break soon. A coffee cup symbol advises a break and a warning tone sounds. At the same time, the multimedia system offers to search for a highway rest stop.
A 5-stage circular display in the driver display shows the driver their current attention level, as well as the time that has elapsed since their last break.
Attention monitoring can be set to two sensitivity levels:
- Standard: Attention monitoring reacts with normal sensitivity.
- Sensitive: Attention monitoring reacts with higher sensitivity. The driver is warned earlier and the attention level identified by the system is adjusted accordingly.
- Off: Warning output is suppressed in "Off" mode and no additional displays are shown.
The last selected sensitivity level is reactivated after an ignition cycle. If the system has been switched off, the coffee cup symbol appears with the word "OFF".
The driver can call up the following additional information via the "Info page" in the multimedia system:
- Attention level (display, 5-stage)
- Driving time since last ignition cycle (in hours and minutes)
- Passive attention monitoring (e.g. vehicle speed less than 60 or more than 200 km/h)
When the system is passive, the message "System passive" is displayed in addition to the driving time since the start of the journey and the display of the attention level. Microsleep warning can be switched off.
Functional restrictions
Attention monitoring may also be impaired in the following situations:
- When using a sporty driving style or in active driving situations (high cornering speeds, heavy acceleration, lane changes)
- In the event of extremely poor road conditions (surface undulations, pot holes) or consistently strong crosswinds
- When operating the MEDIA display or during telephone calls
Microsleep event detection will not work or may be impaired if:
- The driver's eyes are concealed by an unfavorable steering column adjustment
- Light conditions are unfavorable or the driver is wearing glasses or sun glasses
- The view direction is outside the field of view of the driver camera
| Function schematics | |||
| Monitor attention, function schematic | Model 420 | PE54.30-S-2501-97VRA | |
| Model 447 with code XM7 (MOPF II) | PE54.30-S-2501-97A | ||
| Additional basic functions | |||
| Driver activity detection, basic function | GF54.30-S-1000A | ||
| Detailed information | |||
| Functional limitations of attention monitoring, detailed information | GF54.30-S-0020-01A | ||
| Component part descriptions | |||
| Driver camera, component description | Model 447 with code JK8 (Driver camera) with code XM7 (MOPF II) |
GF82.90-S-5051A |