What is a Pre-tensioner?

[StGemma]

Pre-tensioner introduction is as follows: 1. The pre-tensioner tightens the seat belt during the initial phase of moderate to severe frontal collisions, near-frontal collisions, or rear-end collisions. 2. For vehicles equipped with side-impact airbags and roof curtain airbags, the seat belt pre-tensioner can assist in tightening the seat belt during side collisions or rollover accidents. The control devices for pre-tensioning retractors are divided into two types as follows: 1. Electronic control device. The electronic control unit (ECU) detects abnormal changes in the vehicle's acceleration, processes the signal through the computer, and sends it to the retractor's control device to activate the pre-tensioning device. This type of pre-tensioning seat belt is usually used in combination with auxiliary airbags. 2. Mechanical control device. The sensor detects abnormal changes in the vehicle's acceleration, and the control device activates the pre-tensioning device. This type of pre-tensioning seat belt can be used independently.