O3M151 3D Smart Sensor Object Detection
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In contrast to the case described above, objects which are more distant from the vehicle but which
are on a collision course because of their high relative speed (i�e� the vector difference between the
vehicle speed and the object speed is large), do trigger an early warning signal� In this case the time
before a potential collision ("time to contact") may be relatively short� Since the warning signal is trig-
gered in good time, the driver is able to take evasive action to avoid a collision�
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Where an object close to the vehicle is moving at a speed similar to that of the vehicle (driving in
convoy), because of the very low relative speed there is no threat of a collision, and no warning signal
is triggered� If the leading driver brakes, the relative speed increases and the Smart Sensor triggers a
warning signal�
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If the vehicle is following a curved path, objects in front of the vehicle trigger a warning signal only
if they are projected to become critically close based on the vehicle maintaining its current steering
angle� An object which for instance is at a minimum distance from the vehicle (i�e� tangentially to the
current position on the curve) does not trigger a warning signal�
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Objects (pedestrians or vehicles) moving laterally into the projected path of the vehicle do trigger a
warning signal� In contrast, objects which are moving laterally quickly enough out of the path of the
vehicle, do
not
trigger a warning signal�