NCR External Side Airbags

Pre-Crash External Side Airbag System Introduced

A new pre-crash safety system prototype developed by auto industry supplier ZF Friedrichshafen AG uses an external side airbag which is deployed milliseconds before a collision. The company says the system 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 can determine if a crash is imminent and decide whether or not to deploy the airbag.

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, Germany. “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.

The biggest challenge in the development of this system was reliably recognising 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 must 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 litres (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.

This article courtesy of Russell Thrall III, publisher CollisionWeek. Check out their website at:

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