DISTANCE RECOGNITION SUPPORT SYSTEM (DRSS)

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Outline

•  For the distance recognition support system (DRSS), the radar unit calculates the distance between the vehicle ahead and the detecting vehicle, and if the calculated distance is less than the previously set distance, it notifies the driver that the distance between the vehicles is close.
Warning
•  The distance recognition support system (DRSS) provides advice for safe driving by indicating a safe distance to the vehicle ahead. The system does not activate a warning to avoid a collision with the vehicle ahead.
•  The distance recognition support system (DRSS) may not operate normally under the following conditions.
―  Visibility is reduced due to a vehicle ahead casting off water, snow, or sand.
―  Heavy cargo is loaded in the luggage compartment or on the rear seat.
―  Ice, snow or dirt adheres to the surface of the radiator grille or front emblem.
―  Inclement weather caused by snow, rain or sand storms.
―  Driving near facilities and buildings which emit strong radio waves.
―  Distance to the vehicle ahead is extremely short.
―  Another vehicle cuts into the driving lane ahead of the vehicle.
―  Driving on a continuously curving road.
―  Entering or exiting a curve.
―  Driving on narrow lane roads due to road construction or lane closures.
―  The vehicle ahead or an obstruction enters the blind spot of the radar unit.
―  Driving under erratic conditions in which there is a surrounding accident or vehicle breakdown.
―  Driving on roads with repeated up and down slopes (vehicle ahead cannot be detected, and it may be approached too closely).
―  Driving on poor roads or unpaved roads.

Functions

•  If the calculated distance is less than the previously set distance, the radar unit notifies the driver that the distance to the vehicle ahead is close (distance is less than set distance) using the active driving display.

Personalization features

•  The distance recognition support system (DRSS) can be personalized as follows: For details on personalization features, refer to the [i-ACTIVSENSE PERSONALIZATION]. (See i-ACTIVSENSE PERSONALIZATION.)
―  The system can be set to ON (operational)/OFF (non-operational) (initial setting is ON (operational).)
―  Distance for operating notification function (Initial setting is "Near")


System conditions display function

•  The radar unit displays the system status in the active driving display.

Condition

Active driving display indication

Center display
Distance recognition support system (DRSS) is ON (operable)
Distance to vehicle ahead is long *1
No display
Distance to vehicle ahead is less than previously set distance (notification function operates)
No display
System is ON (operational) and no vehicle ahead is detected
No display
No display
Dirty radar sensor is detected
No display
Warning display*2
Distance recognition support system (DRSS) malfunction detected
No display
Warning display*2
Distance recognition support system (DRSS) OFF (non-operational)
System is OFF (non-operational)
No display
No display

*1  :The distance between vehicles varies depending on the vehicle speed. For details on the distance between vehicles, refer to the Distance between vehicles Chart (reference). (See Distance between vehicles table (reference).)
*2  :For the warning display content on the center display, refer to the [CENTER DISPLAY]. (See CENTER DISPLAY [WITH CENTER DISPLAY].)

Structural view

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System wiring diagram

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Block diagram

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Operation

Operation condition
―  Distance recognition support system (DRSS) is ON (operational)
―  MRCC is OFF (non-operational) (When MRCC is ON (operational), notification function does not operate because MRCC distance between vehicle control operates)
―  Vehicle speed calculated by radar unit, based on wheel speed signals received via CAN communication from DSC HU/CM, is 30 km/h {40 mph} or more
―  Distance to vehicle ahead is less than previously set distance
Operation
1.  The radar unit calculates the distance between the vehicle ahead and the detecting vehicle, and if the calculated distance is less than the previously set distance, it sends a notification display request signal to the instrument cluster.
2.  When the instrument cluster receives the notification display request signal from the radar unit, it displays the alert screen in the active driving display.
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Distance between vehicles table (reference)

Vehicle speed (km/h)

Distance between vehicle and vehicle ahead (m)

Far

Medium

Short
Approx. 30
Approx.19 or less
Approx.17 or less
Approx.15 or less
Approx. 60
Approx.33 or less
Approx.26 or less
Approx.22 or less
Approx. 100
Approx.53 or less
Approx.39 or less
Approx.29 or less