The tweak is set to be incorporated into belts that will go into series production soon in one of its models.
The "active" part refers to the use of an electric motor that extends and retracts the seat belt buckle automatically, picking up the belt slack in the area of the pelvis and thorax. This holds passengers more firmly in sideways and lengthways directions.
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In addition, fastening seat belts in the rear is also made much simpler: the seat belt buckle emerges from the upholstery when the rear doors are opened and is provided with an illuminated insertion slot.
Simplifying use of the seat belt in this manner may increase the percentage of rear passengers who buckle up. The innovation also makes it easier to assist children or people who require help in fastening their seat belts.
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.
Active seat-belt buckles are part of the car maker's integrated safety concept.
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 years now. This pyrotechnic system is triggered in the event of actual impact.
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