Active seat-belt buckle is also integrated in the PRE-SAFE® preventive safety system. This means that whenever PRE-SAFE® becomes active in critical driving situations or when a critical distance from other objects is detected, reversible belt tensioning is also effected in the rear via the active seat-belt buckle function. The restraint system and the passengers are thus better prepared for a possible accident situation. Active seat-belt buckle complements the pyrotechnic belt tensioning which has featured as standard on all outer rear seats in Mercedes-Benz vehicles for many years now. This pyrotechnic system is triggered in the event of actual impact.
The Mercedes safety experts have developed active seat-belt buckle using detailed computer models of the human body, as dummies are only able to simulate the human pelvic system along very rough lines.
"Active seat-belt buckle is another element of our 'PRE-SAFE®' concept, which is intended to provide our customers with optimum protection in real accident scenarios," stresses Prof. Dr. Ing. Rodolfo Schöneburg, Head of Passive Safety and Vehicle Functions at Mercedes-Benz Cars. "After all, we aim to offer a high standard of safety not only in all model series, but also in all seats." Active seat-belt buckle has also been developed with an eye on new markets in which the level of occupied rear seats is up to 30 percent – markedly higher than in Europe. "In the rear of premium saloons in particular, passengers tend to sit
in particularly relaxed positions in the generous space which is available," explains Schöneburg. "Active seat-belt buckle as part of PRE-SAFE® unlocks the full potential of the on-board restraint systems."