ZF presented its system for the passive protection of car occupants on its global technology day. The external pre-crash airbag will significantly improve side impact protection in the future.
After the belt, it is the most important instrument for the passive safety of vehicle occupants and was installed in 2018 in around 70 million cars sold worldwide: the airbag. In Germany, he is responsible for the fact that after its introduction, the number of fatalities between 1990 and 2005 fell by half.
The supplier ZF believes that the number of people who die as car passengers or who suffer serious injuries could even be significantly reduced. And with the proliferation of his presented on the recent global technology day pre-crash protection system, the peculiarity of which are attached to the outside of the vehicle side airbags.
Side impact often ends fatally
A side impact can be particularly critical for the vehicle occupants. About one-third of those killed in car accidents are killed, because there is much less crumple zone than in a frontal collision. The external impact bag of the occupant protection system triggered prior to the collision could reduce the accident consequences of a side crash for occupants by up to 40 percent by forming an additional crumple zone in the door area between the A and C pillars prior to collision.
The prerequisite for this is an efficient environment sensor that can detect an unavoidable side impact in good time and activate the protection system accordingly. It uses cameras, radar and the laser-assisted lidar. To decide whether or not an impact will actually occur, the system has very little time, namely 150 milliseconds. If the result is yes, then ignites the up to 400-liter bag with the bang of a firecracker body and unfolds in the lower part of the front and rear doors.
Motorcyclists for the time being excepted
Currently not ignited is the impact of a motorcyclist. First, it should be clarified in this case with experiments, whether the biker is not prevented by the airbag at a favorable for him trajectory over the car and thereby carries greater injuries than without this impact protection.
Another system that ZF is currently testing is "Automated Front Collision Avoidance," which can take fully automated evasive maneuvers if manual braking or avoidance, for example, oncoming traffic is not timely. The driver assistant considers whether emergency braking is still possible and where otherwise there is free space for an evasive maneuver. And there could be fewer accident victims among pedestrians. Here, ZF has a system in planning that can detect people crossing the road in the crossroads shortly before turning off and immediately initiate emergency braking.
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