Press Release

2019-Jun-05

ZF Presents World’s First Pre-crash External Side Airbag System

  • ZF safety system is designed to expand the size of the lateral crumple zone fractions of a second before a collision occurs
  • Up to 40 percent reduction in occupant injury severity for side impact collisions
  • ZF’s pre-crash technologies, including those for safety systems such as seat belts, are becoming more important

Friedrichshafen/Memmingen. Side impact collisions are among the most dangerous type of road traffic accidents, accounting for nearly 700 deaths per year and nearly a third of all occupant fatalities on German roads. A new pre-crash safety system prototype developed by ZF uses an external side airbag deployed milliseconds before a collision. It provides an additional lateral crumple zone, which can help save lives and reduce occupant injury severity by up to 40 percent. To make this possible, ZF has networked the airbags to the vehicle’s sensor systems and developed algorithms that are capable of determining if a crash is imminent and decide whether or not to deploy the airbag.

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ZF Presents World’s First Pre-crash External Side Airbag System

ZF gave a live demonstration of the prototype for the world’s first pre-crash occupant safety system with an external side airbag in Memmingen. “We highlighted that this safety system has the potential to significantly reduce occupant injury severity in cases of side impact collisions,” explains Uwe Class, Head of the Safe Mobility Systems department, within ZF’s Advanced Engineering team.

ZF is currently the only company to provide the 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,” says Class.

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.

CONTACT

Mirko Gutemann

Technology and Product Communications

+49 7541 77-960136

mirko.gutemann@zf.com