Active bonnet (Bonnet Pop-Up)

Pop-up Bonnet is marking passive safety features, Nissan, this element is used to protect pedestrians. Thanks to the active (ejection) hood is in a pedestrian impact crumple increased space between the bonnet and the engine block which will make the consequences of a collision.

Today, the protection of pedestrians attached increasing importance. Conflict of pedestrians and the vehicle often has tragic consequences, so designers try to avoid conflict if possible. Using various sensors move ahead of the vehicle the driver is notified of an impending collision with a pedestrian . When no collision is unavoidable, it is necessary to minimize the consequences arising from the accident, ie. prepare a place for pedestrian impact, so that it hurt the car as possible. Designers usually solves this problem by reducing the stiffness of the bonnet, eliminating sharp edges or special defoelementy. Withheld person is usually flung into the air and then falls on the hood of a car braking. The head then hits the bonnet or windscreen. If the impact is too hard leads to injury or even death. The aim of designers is to design a relatively soft bonnet that would mitigate the fall of the body. Modern cars however, have completely filled the engine compartment and the distance between the hard parts of the unit and the hood is minimal. For too soft bonnet would have been the body to puncture the hard part, and the effect would be the same as the hard bonnet.

Principle

The principle of ejection bonnet is obvious. Case of a conflict with a pedestrian's car hood with pyrotechnic detonators heave and strain space is artificially increased. Body then falls on the relatively soft hood, currently heave a few centimeters. Nissan, the system first introduced in series with the launch of Skyline Coupe. In Europe a similar system can be found at Jaguar and Citroen marked - PPDB (Pedestrian Deployable Bonnet pyrotechnic) .