There are various styles of pretensioners, each with their advantages and downsides. These different technologies are described below:
Mechanical Tensioner:
The mechanical tensioner is the least common of the three technologies. it’s connected to the belt by an awfully powerful spring, which is compressed and latched in situ. within the case of a right away acceleration/deceleration, the latch is unlocked, and also the spring is released, tightening the safety belt. The disadvantage of this particular technology is that quite common actions can activate the pretensioner, like putting on the safety belt quickly. it’s also usually very difficult if not impossible to reset, meaning you’d presumably replace it after it’s activated.
Electrical Tensioner:
Before the introduction of the pyrotechnic version, the electrical tensioner was the well-liked option. Connected to the ECU, the pretensioner receives a symbol from the accelerometer, sometimes the identical sensor used for the airbag deployment system. When this sensor detects sudden deceleration, it sends an indication that triggers a motor to quickly retract and tighten the belt. Because this technology is linked to a sensor someplace else within the car, it doesn’t have the matter of accidental triggering that the mechanical version does. Also, this kind is that the popular option to use when the pretensioner is activated during an evasive maneuver because of its ability to be reused multiple times.
Pyrotechnic Tensioner:
Currently, pyrotechnic pretensioner is that the commonest version found in modern cars. this is often because they’re considered the foremost reliable of the three. The pyrotechnic tensioner is additionally connected to the ECU and uses an accelerometer found elsewhere within the vehicle. When it receives an electrical pulse, a burster is employed to line off a gas generator. the quantity of gas applies pressure to a mechanical linkage with pulls on the safety harness. The good thing about this technology is that it’s currently the fastest option. However, the downside of this one is that it’s a one-time use, meaning it has to get replaced after it’s activated.
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