Introduction:
3 points seatbelt pretensioner is designed to retract some of the webbing of a seatbelt the instant a collision occurs, tightening the seatbelt to restrain occupants quickly and reducing the amount they are thrown forward in a moderate or severe frontal crash.
Load limiters help protect occupants from seatbelt-inflicted injury. In the event of a crash, 3 points seatbelt pretensioner restrains the occupant until certain amount of force is applied. At this point the load limiter releases the webbing gradually so as not to exert too much force on the chest of the occupant.
According to different control devices, pre-tightened seat belts are divided into two types:
1) Mechanical control, mainly relying on sensor detection-deflagration pre-tensioned seat belt
The internal structure is more complicated, such as gas generator, piston, 3 points seatbelt pretensioner etc. The most important point is that this detonation method is irreversible, and it uses a unified sensor system with the airbag, so it works in conjunction with the airbag.
However, this is not active, that is to say, only after the collision occurs, the action will be triggered and the tension will begin.
2) Electronic control, mainly relying on ECU (electronic control unit) electronic control unit detection-active pre-tensioned seat belts
There is an important conceptual TTC-time to collision. All actions of the pre-tensioned seat belt are completed within TTC=1.45 seconds. System integration is done through a series of ultra sound, radar, camera, ECU, and actions are completed through retractor, buckles, webbing, and fixture.
It is easy for us to say, but the laboratory must pass many tests to prove that it can meet the requirements of national standards.
Crash test, to measure the relationship between the gap between the seat belt and the human body, the pre-tightening force and the pre-tightening speed;
Dynamic test, measure pelvis displacement, thorax displacement, and evaluate the preload effect;
current test, to measure the relationship between the control current and the tension of the seat belt;
The sled test measures the response time of emergency locking.
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