- Our hapless pedestrian steps into the path of an oncoming Jaguar XK.
- The XK´s nosecone, carefully sculpted to tip a pedestrian onto the car´s hood without breaking the leg at the knee, makes contact.
- As the impact occurs, a sensor array ascertains the size, shape and mass of an object. If the readings indicate that a person has been struck, the car triggers the PDBS system.
- Two pyrotechnic actuators explode with roughly the power of 12-gauge shotguns. The blasts inflate tiny cylinder-shaped airbags enclosed in strong yet flexible tubes of braided polyester filament.
- The tubular posts punch upward and raise the 40-pound aluminum hood about 2.5 inches in a scant 30 milliseconds, creating a crumple space above the engine.
- The pedestrian´s head and upper body make contact with the hood, which collapses in a controlled manner, thanks to a hexagonally-stamped endoskeleton.
- The pyrotechnic posts, like passenger-compartment airbags, immediately vent their gases and deflate, lowering the hood and restoring the driver´s forward visibility.