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What does the seatbelt pretensioner function mean?

1 Answers

StSabrina

07/29/25 3:00pm

Seatbelt pretensioner function refers to when there is a sudden change in vehicle speed, the retractor equipped with a control device and pretensioning device, which plays a major role, can tighten the webbing in about 0.1 seconds, enhance the restraint on occupants, and lock the webbing to prevent occupants from leaning forward, effectively protecting their safety. Seatbelt pretensioner function is activated when a vehicle collision occurs. Once the sensor detects a frontal impact exceeding the specified value, an electrical signal is transmitted to the electronic igniter of the power device, initiating the pretensioning seatbelt. Before occupants move forward due to the collision, the pretensioning seatbelt tightens and maintains this state, ensuring occupants remain firmly seated. There are two types of seatbelt pretensioner control devices: one is an electronic control device, typically used in combination with supplementary airbags. The other is a mechanical control device, which activates the pretensioning device when the sensor detects abnormal changes in the vehicle's acceleration. This type of pretensioning seatbelt can be used independently. Pretensioning devices come in various forms. A common type is the pyrotechnic pretensioner, composed of a gas initiator, gas generator, conduit, piston, cable, and drive wheel. It has a limited service life and must be replaced upon expiration. If the vehicle's seatbelt has a pretensioner function, it must be worn when driving. Failure to wear it during a collision not only leaves the occupant unprotected but may also increase the risk of injury due to the seatbelt's retracting action. The correct method of using a seatbelt is: Check the technical condition of the seatbelt to ensure safety; Fasten the seatbelt across the hips and chest; Return the seatbelt to the retractor when the seat is unoccupied.

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