How different types of pretensioner seat belt works
This article introduces the working principle of different types of pretensioner seat belt
Pretensioner seat belt is a kind of automobile safety belt. Different from other safety belts, pretensioner is added to the pretensioner safety belt. The pretensioner can sense a certain impact during collision. It is a device that acts through gas generator to pull the safety belt close instantly. The pretensioner seat belt is generally equipped with a force limiter.
(1) The internal device of the force limiting pretensioner seat belt includes retractor, vehicle sensing and belt sensing sensors, force limiter and pretensioner. Its working principle is that when the Airbag ECU sends a pretensioning ignition signal, the gunpowder in the pretensioner burns to produce high-pressure gas as curling power to eliminate the gap between the safety belt and the human body. At present, the force limiting pretensioner seat belt has been widely used in medium and high-end models.
(2) the internal devices of the precoiled Pretensioner Seat belt include retracter, vehicle sense and belt sensor, force limiter, pretensioning device and pre winding motor. Its working principle is: when the radar sensing device senses the distance between the vehicle and the front vehicle, if the distance is less than a set value, its ECU sends a signal to control the motor movement, eliminate the gap between the safety belt and the human body, and remind the driver of emergency braking or emergency treatment. The prevolt Pretensioner Seat belt involves many active safety related devices (such as radar detection, computing procedures, etc.), so its overall price is very expensive and is currently only used in some high-end vehicles.