DRIVER ATTENTION ALERT SYSTEM
id151000002600
Outline
• The driver attention alert system warns the driver using the warning display and sound if it detects the driver's lack of attentiveness.
• The driver attention alert system activates the warning if the driver's attention decreases due to driving long distances for long periods causing the vehicle to sway.
Functions
• For the driver attention alert system, the parking assist unit determines the driver's driving characteristics based on the steering angle signal and yaw rate signal.
• If the driver drives the vehicle different from the determined driving characteristics, the parking assist unit determines that the driver's attention has decreased and activates the warning.
Driving operation determination function
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• When the vehicle is driven at approx. 65 km/h {40 mph} or more for approx. 20 min, the parking assist unit determines the driver's driving characteristics and sets the threshold for the vehicle sway.
• The parking assist unit clears the determined driving characteristics data when any of the following conditions is met.
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― Vehicle is stopped for 15 min or more
― Vehicle is driven at less than approx. 65 km/h {40 mph} for 30 min or more
― Ignition is switched off
Driving operation monitoring function
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• When the following conditions are all met, the parking assist unit monitors the driving operations continuously and calculates the average value at a certain interval.
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― Driving characteristic determination is completed
― FSC does not recognizes a sharp curve
― FSC recognizes white lines
― Vehicle speed calculated by parking assist unit, based on wheel speed signals received via CAN communication from DSC HU/CM, is approx. 65 km/h {40 mph} or more and less than approx. 140 km/h {87.0 mph}.
Warning function
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• The parking assist unit calculates the value for the current driving operation based on the past data for two times calculated by the driving operation monitoring function, and compares it with the the threshold for the vehicle sway set by the driving characteristic determination function. If the comparison result exceeds the threshold value for the vehicle sway, it displays the warning screen on the multi-information display of the instrument cluster and activates the warning sound.
• If the warning has not been activated for 2 h since the driving characteristic determination was completed, the parking assist unit displays the warning screen on the multi-information display in the instrument cluster and activates the warning sound.
• The warning is not activated for approx. 45 min after being activated once.
Personalization feature
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• The driver attention alert system can be set to ON (operational)/OFF (non-operational) (initial setting is ON (operational). For details on the personalization features, refer to the [i-ACTIVESENSE PERSONALIZATION]. (See
i-ACTIVSENSE PERSONALIZATION.)
Structural View
System Wiring Diagram
Operation
1. The parking assist unit sets a threshold for vehicle sway (1) based on the driving operation determined by the driving characteristic determination function.
2. Based on the steering angle signal (2) and the yaw rate signal (3), the parking assist unit calculates the current driving operation (4).
3. The parking assist unit compares (5) the threshold for vehicle sway with the current driving operation.
4. If the compared value exceeds the threshold for vehicle sway (6), or if the warning has not been activated for 2 h or more since the driving characteristic determination was completed (7), the parking assist unit sends a warning display request signal and warning sound request signal (8) to the instrument cluster.
5. When the instrument cluster receives the warning display request signal and the warning sound request signal, it displays the warning display on the multi-information display and activates the buzzer in the instrument cluster.
