Upgraded sensors detect the collision trajectory of another vehicle
Like today’s BSD systems, the ‘ Rear Cross Traffic Alert’ (RCTA) is based on two short-range radar sensors. These two eyes, which are not visible behind the plastic bumper at the right and left rear corners of the vehicle, can each monitor a 120 degree angle. In addition to the BSD function, this relatively wide arc can also be used to detect vehicles crossing behind. This assumes, of course, that the vehicle is fitted with Continental’s powerful radar sensors, which generate a precise image of the vehicle surrounding.
This is why Continental has specifically upgraded its existing BSD sensors and made them more accurate. The challenge for an electronic aid like the RTCA is being able to reliably calculate the collision trajectory of the crossing vehicle, explained Norbert Hammerschmidt, head of advanced driver assistance systems customer programs. What we need is precise data on the crossing vehicle’s direction and speed and how far away it is. The new sensor generation provides us with this basic data. If it assesses a collision between the vehicles as probable, the system will warn the driver.
In the current demonstration vehicle configuration, the RTCA is designed to detect cars, motorcycles and bicycles that are within at least 35 meters and traveling at a speed of somewhere between 5 km/h and up to around 30 km/h. It will detect pedestrians, but only those who are walking quickly and directly towards the vehicle will trigger the warning. One of the RTCA’s technical subtleties is that it can also detect vehicles which are turning while passing behind. If the advanced driver assistance system detects an imminent collision, a warning will sound and LEDs will light up in the interior rear view mirror to alert the driver. The warning strategy employed can, of course, be modified in agreement with the vehicle manufacturer. One possibility might be an additional warning light in the rear roof lining, for example. Another possible action could be for the vehicle’s brakes to be automatically applied.