ZF EXTERNAL AIRBAG
ZF presented the world’s first pre-crash occupant safety system with an external side airbag that can deploy before a collision. It can help reduce occupant injury severity for side impact collisions by up to 40 percent.
From Recognition to Deployment in the Blink of an Eye
The biggest challenge in the development of this system was reliably recognizing an unavoidable collision and deploying the external side airbag before the collision takes place. The system has approximately 150 milliseconds to make the decision to deploy the airbag and fill it – roughly the amount of time it takes a person to blink.
The vehicle’s sensors first have to identify a potential impact quickly and accurately. This is possible with connected cameras, radar and lidar. Algorithms within the system software decide whether or not a collision is unavoidable and the deployment of the airbag is both possible and beneficial. If these decisions are all affirmative, the system ignites the inflators to fill the airbag. The airbag, which has a capacity of between 280 and 400 liters (five to eight times the volume of a driver airbag) depending on the vehicle, then expands upwards from the side sill to form an additional crumple zone in the door area between the A and C pillars.
Reduce the Risk of Injury
In a side impact collision, the occupants on the side of the impact are at particular risk of serious injuries in the chest area if the passenger cabin is severely deformed. The ZF pre-crash safety system can reduce the penetration of the intruding vehicle by up to 30 percent, helping to significantly reduce the occupants’ risk of injury.
The predictive information about an unavoidable collision also helps to further improve the effectiveness of established standard safety technology. For example, the ACR8 Active Control Retractor can warn the occupants or help secure them in a safe position in the critical fractions of a second before the collision.
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