Buffering energy-absorbing type safety belt pre-tightening device based on shape memory alloy and control method of buffering energy-absorbing type safety belt pre-tightening device

Abstract

The invention discloses a buffering energy-absorbing type safety belt pre-tightening device based on shape memory alloy. The buffering energy-absorbing type safety belt pre-tightening device comprises a steel wire rope, a piston, the shape memory alloy and a central processor. The steel wire rope is used for being connected with a plugging lock fixing point of a safety belt or a braid of the safety belt. The piston is connected and fixed to the steel wire rope in a pressing mode. One end of the shape memory alloy is fixed to the end of the piston, and the other end of the shape memory alloy is fixed to a lower fixing point of the safety belt. The central processor is connected with a sensor and a pre-tightening device power switch, obtains data for analysis through the sensor and controls the pre-tightening device power switch to electrify the shape memory alloy. The invention further discloses a control method of the buffering energy-absorbing type safety belt pre-tightening device based on the shape memory alloy. The buffering energy-absorbing type safety belt pre-tightening device based on the shape memory alloy is simple in structure, good in reliability, low in cost and sensitive in control, and it is promoted that the light weight of a vehicle body is effectively achieved with the shape memory alloy.

Description

technical field [0001] The invention relates to the field of automobile safety, in particular to a cushioning energy-absorbing seat belt pretensioner based on a shape memory alloy and a control method thereof. Background technique [0002] The pre-tensioned seat belt is a kind of car seat belt. The difference from other seat belts is that a pre-tensioner is added to the pre-tensioned seat belt. The pre-tensioner can sense a certain impact during a collision. It is a device that instantly pulls the seat belt closer by generating an action using a gas generating agent. [0003] Pre-tensioned seat belts are generally equipped with force limiters. In the prior art, two pre-tension forms are adopted: one is a pre-tensioned force-limited seat belt, and the other is a pre-rolled pre-tensioned force-limited seat belt. The working principle of the former is that the airbag ECU sends a pre-tension ignition signal, and the gunpowder in the pre-tensioner burns to generate high-pressure...

AI Technical Summary

Problems solved by technology

[0006] The first purpose of the present invention is to solve the problem that the gas generator is often used in the pretensioning device in the prior art, which leads to a complicated structure, increases the weight of the car, and does not meet the requirements of light weight of the car

[0007] The second object of the present invention is that the locking mechanism of the pre-tensioning device adopts a C-shaped ring mounted on the conical surface of the piston or the piston thread to control the displacement or limit of the shape memory alloy, and overcome the complicated structure in the prior art , Difficult to assemble, easy to miss assembly and cause functional failure defects

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