PRE-CRASH SAFETY SYSTEM GENERAL


  1. OUTLINE


    1. Pre-Crash Safety (PCS) System


      1. The pre-crash safety system detects the possible collision of the vehicle with an obstacle, based on information received from various sensors. The obstacle may be a vehicle traveling in the opposite direction. PCS lessens the damage sustained in the collision by working in unison with other systems. As part of this, the effectiveness of the pretensioner mechanism is enhanced by retracting the seat belts, and systems that dampen the impact of the collision, such as the brake control system, are operated.

      2. This system uses a millimeter wave radar sensor to detect a possible collision with a vehicle or obstacle in front. When specific operating conditions are met, the system will retract the seat belts before a collision and perform brake assist control and brake control.*

        *: Models with pre-crash brake

  2. MAJOR DIFFERENCE


    1. The new models have been modified from the previous models as shown below:


      1. The connection between the driving support ECU assembly and millimeter wave radar sensor has been changed from a direct communication to a CAN communication line.

  3. PRECAUTION


    1. When the millimeter wave radar sensor assembly detects an object in front of the vehicle under the following conditions, the driving support ECU assembly may determine that the possibility of a collision is high or a collision is unavoidable, and operate the pre-crash system. This does not indicate a malfunction.

      A019PSPE01
      Number Condition
      (1) Object near outer edge of a curved road (Guard rail, street light or sign)
      (2) Oncoming traffic on a curved road
      (3) Opposing traffic at an intersection
      (4) Narrow iron bridge
      (5) Metal object, steel plate the road
      (6) Rapid approach to a preceding vehicle
      (7) Toll gate
      (8) Overpass or sign over the road
      (9) Vehicle height changes significantly (front of vehicle inclined either upward or downward)
      (10) Millimeter wave radar sensor assembly is misaligned (such as after reinstallation or after a collision)
      (11) Metal object such as a sign in front of the vehicle on an uphill slope
      (12) Metal object or steel plate in the ground at the base of a downhill slope
      (13) Bump on the road
      (14) When passing through a tunnel

    2. Conditions in which the millimeter wave radar sensor assembly does not detect an object:


      • The vehicle collides with an object located outside the detection area of the millimeter wave radar sensor assembly (+/- 10°), such as in a side collision, rear collision, etc.

    3. The millimeter wave radar sensor assembly might not be able to detect the following objects as collision objects:

      Objects that cannot be detected Plastic items (safety cones, etc.)
      Objects that cannot be detected in a stable manner People, bicycles, motorcycles, trees, animals, snow fences, etc.

    4. Conditions in which detection performance deteriorates:


      • On a tight curve or bumpy road

      • Something or someone suddenly emerges in the direction of travel of the driver's vehicle at a place such as an intersection

      • Another vehicle suddenly cuts in the direction of travel of the driver's vehicle

      • In severe weather such as heavy rain, fog, snow or a sand storm

      • Vehicle is skidding sideways while VSC is not operating

      • Vehicle height changes significantly (front of vehicle inclined either upward or downward)

      • Millimeter wave radar sensor assembly is misaligned (such as after reinstallation or after a collision)