ZF Demos Pre-Crash External Side Airbag System

ZF, a global technology company that supplies systems for passenger cars, commercial vehicles and industrial technology, recently gave a live demonstration of the prototype of its new pre-crash occupant safety system with an external side airbag in Memmingen, Germany.

“We highlighted that this safety system has the potential to significantly reduce occupant injury severity in cases of side-impact collisions,” said Uwe Class, head of the safe mobility systems department within ZF’s advanced engineering team.

ZF provides a full spectrum of integrated vehicle safety technology – from sensor systems, algorithms and control units to active and passive actuators.

“Our deep understanding of the entire ‘see. think. act.’ process enables us to conceptualize and realize integrated vehicle safety solutions such as the new pre-crash safety system,” said Class.

ZF said that 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 upward from the side sill to form an additional crumple zone in the door area between the A and C pillars.

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. ZF said that the pre-crash safety system could 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.