KR20190080645A - Sensor based inflatable Air bags system comprising fabric with breaking area - Google Patents

Abstract

The present invention relates to an airbag. More specifically, the present invention provides a wearable airbag for human body protection, comprising: an airbag made of fabric having two or more areas with different bursting strength; an acceleration sensor for detecting the movement of a user; an inflator for injecting gas into the airbag and having an exhaust valve and an intake valve; a pressure sensor for measuring gas pressure in the airbag; and a control unit for, when the value measured by the acceleration sensor reaches the fall reference value, operating the inflator to inject gas into the airbag and for selectively operating the exhaust valve and the intake valve by judging based on the value measured by the pressure sensor.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a human-wearable air bag comprising a fabric having a rupture region expanding from a pressure gas container by sensor detection,

The present invention relates to an air bag, and more particularly, to an air bag using a fabric having a sensor, an inflator, and a rupturing area to improve the impact mitigation resulting from air expansion of the air bag.

 Many efforts are being made to protect human lives from various disasters that occur in the industrial field or everyday life. The most prominent safeguards in everyday life are automotive airbags and it is well known that the actual airbag deployment is an effective way to protect people. Such a vehicle air bag system can be improved and improved to develop a product that can be worn on the human body, so that it can protect human lives from various industrial disasters if applied to industrial sites as well as daily life.

 According to the current social statistics, it is found that the most disaster is caused by evacuation accidents such as fall, fall, etc. In this way, it can be seen that the type of industrial accidents is high in the type of falling accident such as falling or falling. In the case of fall accident, mortality rate is much higher than other disasters. In order to prevent disasters and deaths caused by such falls, it is necessary to develop and distribute protective airbags in a form that can be easily worn by workers, reducing the burden of installing additional facilities at the construction site.

In addition to workers working in hazardous work environments, the number of injuries caused by evacuation accidents such as slips in daily life of the elderly and severely ill patients has increased greatly. The degree of impact on the body during a conduction fall is so great that it can damage the hip bone or hip joints. In particular, healing is very difficult if the hip and joints in which the nerves and blood vessels are tightly distributed are damaged, and if excessive loads are applied, it can lead to serious post-injury or death. It is very urgent to develop and supply a wearable airbag to protect elderly elderly people who are not only workers but also those who have difficulty in the behavior in the risk of such a fall injury.

Such a fabric-type airbag for shock protection expands through instantaneous air inflow if necessary, absorbs temporal impact applied to the human body, protects the human body, and after a few seconds it loses its shock absorbing function due to natural air leakage have.

 Until now, wearable airbags have been actively developed for two-wheelers or fall protection. However, they are having difficulties in entering the market due to the problem of high production cost compared to technology investment and reliability of actual buyers' inflator systems in the early market.

 At present, in the case of a general human-wearing airbag product, the productivity is very low due to the complicated and many processes of weaving → coating → first sewing → adhesion (air cushion forming) → second sewing (sensor attachment and completion of clothes form) And the reliability of the product is low due to the occurrence of defective products in stages.

In order to overcome this, OPW fabric using jacquard weaving technology, high durability coating technology, optimum sensor, and inflator manufacturing technology have been developed to improve productivity in manufacturing process and to reduce user's comfort and lightness , It is necessary to develop an airbag system for protection against overturning and impact.

An excessive internal pressure of the air bag inflated when the human body is impacted may cause injury or lack of impact mitigation, resulting in a large HIC value. Therefore, many improved air bags have been developed recently.

In addition, the smart airbag for protecting human body to be developed in the present invention is expected to contribute to securing and expanding the market by developing a high-performance airbag which is low in cost and shortens the response time of the sensor.

Prior Art 1: Korean Published Patent Application No. 1992-006556 (published Apr. 27, 1992)

SUMMARY OF THE INVENTION It is an object of the present invention to provide an air bag which is excellent in efficiency and improved in safety.

According to a preferred embodiment of the present invention, the present invention provides an airbag comprising a fabric having at least two regions with different rupture strengths; An acceleration sensor for sensing movement of a user; An inflator for injecting gas into the airbag and having an exhaust valve and an intake valve; A pressure sensor for measuring a gas pressure in the airbag; And when the value measured by the acceleration sensor reaches a fall reference value, the inflator is operated to inject gas into the airbag, and the exhaust valve and the intake valve are selectively And a control unit for controlling the operation of the airbag.

According to a preferred embodiment of the present invention, the present invention provides a human body wearing type airbag further comprising a gravity sensor for measuring a height of a user's position.

According to a preferred embodiment of the present invention, the rupture strength is adjusted by a change in the interlacing structure of warp and weft yarns.

According to a preferred embodiment of the present invention, the change in the interlacing structure of the warp yarn and the weft yarn is determined by the number of interlacing crosses of the warp yarn and the weft yarn.

The sensor of the present invention can provide a smart protection function to calculate the actual fall height using a gravity sensor in addition to the sensor for detecting fall and adjust the internal pressure of the necessary air bag.

Further, the inflator of the present invention is calculated from the height sensed by the gravity sensor, so that when the amount of gas in the gas can be greater than the pressure inside the airbag during a required impact, surplus gas is discharged into the atmosphere. Conversely, when a drop from a higher position is sensed, the inflow of outside air by the venturi effect is enabled, so that a lower HIC value can be maintained if more internal pressure of the airbag is needed.

The airbag fabric of the present invention is provided with regions having different rupture strengths so that a part of the airbags are first ruptured at the time of deployment of the airbag and the pattern of the rupture can be adjusted in order or position, And the safety can be improved.

The following effects can be obtained by showing the buffering effect of the airbag with the highest efficiency by the size of the airbag of the same material and the amount of air at the time of injection from the technology of the present invention. That is, it is an effect of reducing the size of the airbag required to buffer the same amount of impact and the amount of air in the inflator, or buffering a larger amount of impact with the amount of inflator air, such as airbags of the same size, made of the same material.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments of the invention and, together with the description of the invention, It should not be construed as limited.
1 illustrates a system for an airbag according to an embodiment of the present invention.
2 shows a system for an airbag according to an embodiment of the present invention.
3 is a diagram illustrating chest acceleration behavior for an airbag according to an embodiment of the present invention.
4 is a graph showing chest acceleration behavior for an airbag according to an embodiment of the present invention.
5-12 illustrate a fabric for an airbag according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Each drawing has been partially or exaggerated for clarity. It should be noted that, in adding reference numerals to the constituent elements of the respective drawings, the same constituent elements are shown to have the same reference numerals as possible even if they are displayed on different drawings. Also, components and acts referred to as " comprising (or comprising) " do not exclude the presence or addition of one or more other components and operations. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to Figure 1, the present invention provides an airbag comprising a fabric having two or more regions having different rupture strengths; An acceleration sensor for sensing movement of a user; An inflator for injecting gas into the airbag and having an exhaust valve and an intake valve; A pressure sensor for measuring a gas pressure in the airbag; And when the value measured by the acceleration sensor reaches a fall reference value, the inflator is operated to inject gas into the airbag, and the exhaust valve and the intake valve are selectively And a control unit for controlling the operation of the airbag.

Referring to FIG. 2, the present invention provides a human body protecting wearable type airbag further comprising a gravity sensor for measuring a height of a user's position.

The sensor senses an unexpected fall due to a force sensor, a motion sensor, a gravity sensor, a magnetic sensor, an acoustic sensor, an image sensor, and the like. When the acceleration is detected by a motion sensor, .

The acceleration sensor can always measure the height difference in the acceleration sensor after turning on the sensor operation switch on the floor before the operation, and the height can be calculated through the acceleration sensor. In addition, the height can be recognized by the operator by notifying the height of the present height by sound, vibration, led, etc. for each 50 centimeters over 1 meter.

The gravity sensor can measure the height of the actual fall. The height calculated from the gravity sensor thus calculates the required internal pressure of the airbag, calculates the amount of gas required to inflate the final airbag, and adjusts the internal pressure of the airbag by operating a valve or the like. At this time, the sensor needs to be supplemented with redundancy for malfunction if it can add sound and image sensor. However, due to the redundancy design, the response time and frequency of malfunction should be checked.

In the event of an accident from the sensor or MPU, the device for opening the pressure gas cylinder immediately operates. At this time, the inflator device should be devised in consideration of the dew condensation due to quenching during the thermal expansion depending on the ambient temperature or the type of pressure gas. The height of the fall is also calculated from the gravity sensor, from which the airbag internal pressure is calculated from the size of the airbag and the amount of gas upon inflation and impact. When the amount of gas in the pressure gas cylinder is greater than the amount required for the air bag, it is measured by a pressure sensor installed in the gas pipe, and a separate inflator valve is operated and released to the atmosphere. On the other hand, when a sufficiently long time is given due to a very large height fall, a structure capable of sucking outside air by using a high-speed air flow due to the ejection of a high-pressure gas can be provided to compensate for insufficient air, Have pressure supplemented. Alternatively, a separate inflator and a double air bag or a separate air bag may be additionally provided to receive and operate the sensor command.

The falling time and the impact speed are determined according to the falling height, and the impact acceleration of the human body is varied depending on the size of the airbag and the internal pressure. In this case, the acceleration, the speed and the deformation when an external impact is applied to the airbag are as shown in Fig. However, in general, a chest acceleration of 60g is 50% probability of fatalities, and less than 1% is said to be less than 40g. Therefore, in the present invention, an air bag which will exhibit the behavior as shown in Fig. 4 is devised.

This reduces the impact acceleration and minimizes the size of the airbag and the overall design to provide the internal pressure, while at the same time, the invention creates a more efficient airbag by modifying the airbag fabric structure to generate a specially designed rupture area. The smart airbag for human body protection to be developed in the present invention is an optimized method of low cost and can be used to make an airbag designed separately for the rupture region, to increase the accuracy of the sensor, to calculate in advance the internal pressure of the airbag necessary for inflation, It is expected that it will contribute greatly to securing and expanding the market by developing high performance air bag.

According to a preferred embodiment of the present invention, each acceleration is measured using a linear acceleration sensor and an angular acceleration sensor, and when the acceleration reaches a set value, it is determined that the accident is a fall.

In addition, according to a preferred embodiment of the present invention, the gravity sensor may be used in parallel with the acceleration sensor to measure the actual height to give a variable to the operation of the inflator.

According to a preferred embodiment of the present invention, sound and image sensors may be used as a redundancy design due to malfunction of various kinds of sensors, but it is necessary to take care that reaction time delay and the like may occur.

According to a preferred embodiment of the present invention, when the accident occurs from the sensor and the MPU, the device for opening the cap of the pressure gas cylinder is operated immediately.

In addition, according to a preferred embodiment of the present invention, the height of the fall is calculated from the gravity sensor, and the size of the airbag required for shock mitigation and the amount of gas are calculated to calculate the internal pressure of the airbag upon inflation and impact. At this time, when the amount of gas in the pressure gas cylinder is larger than the amount required in the air bag, it is measured by a pressure sensor installed in the gas pipe, so that a separate inflator valve is operated and released to the atmosphere.

According to a preferred embodiment of the present invention, when a sufficiently long time is given by a very large height fall, a structure capable of sucking outside air using a high-speed air flow due to the ejection of a high- To compensate for the proper airbag pressure for impact mitigation.

According to a preferred embodiment of the present invention, there is provided an airbag comprising a fabric having two or more regions having different rupture strengths.

According to a preferred embodiment of the present invention, the rupture strength is adjusted by a change in the interlacing structure of warp and weft yarns.

According to a preferred embodiment of the present invention, the change in the interlacing structure of the warp yarn and the weft yarn is determined by the number of interlacing crosses of the warp yarn and the weft yarn.

The airbag fabric according to the present invention is provided with an airbag having different rupture strengths so that a part of the airbag is ruptured first when the airbag is deployed and the pattern of the rupture can be adjusted in order or position, And the safety can be improved.

Overall structure: An air bag made by weaving fabrics designed with different interlacing structure in the size and shape required for a specific location in the fabric of an OPW or general airbag, and coating the thus woven fabric with an appropriate type of resin and thickness.

In other words, the interlacing structure of the warp yarn is not interlaced with the warp and weft of the fabric, and the number of float yarns in either one direction or both directions is generally plain weave, twill weave, As shown in the modified structure of the category, the area of the portion of the tissue which is different from each other in the weft direction is inclined at a size deviating from the float of at most 10 strands in the warp and weft directions, It is a woven fabric designed in the required size and shape.

The tensile strength of the coated fabric in the warp direction is not significantly different by changing the interlacing structure of the warp yarn of the specific part of the fabric. However, when the airbag is expanded, the fabric film is opened due to the high pressure internal pressure, Weak bursting strength due to differences in strength due to differences in the degree of interlaced part.

Vent hole formation: When the interlacing structure is coated on other fabric in the size and shape required for the specific position, the bursting strength is different according to the type and amount of resin, so that the weak bursting strength region ruptures and becomes the vent hole .

In this case, when the internal air pressure increases when the human body and the object are impacted on the inflated air bag during the air bag deployment process, the weakest region is firstly ruptured at a certain level of pressure to act as a vent hole. When the air is released from the vent hole, the shock is relaxed because the depressurization speed is maintained without bouncing.

If the internal air pressure is increased due to deformation of the air bag which is larger than the air which is not sufficient to reach the vent hole, the regulated region with a slightly larger bursting strength is ruptured and a secondary vent hole is generated So that the shock is relaxed once again. Ultimately, the maximum deceleration is achieved in the depression speed integral area of 15 seconds or 36 seconds, resulting in a lower HIC value.

Continuing with the above procedure, that is, sequentially bursting the strong bursting strength portion, eventually becomes a multi-step-attenuation air bag.

Vent holes are created in the non-uniform region of this interlacing. That is, depending on the degree of control of the interlacing structure, the overall bursting can be varied depending on the required size of the tissue change such as jacquard, the required size, the required interlacing tissue change, the resin type and amount.

Therefore, the position, size, and structure of the vent hole may vary depending on the size of the airbag, the amount of impact, and the like.

The first bursting occurs at a specific weak part so that shock absorption occurs when the internal pressure of the impact inflated airbag is raised to a certain level. The subsequent increase in internal pressure due to the subsequent inertia of the process is greater, and the size of the vent hole is regulated below a certain limit so that compression is greater than venting to the first ripped portion.

Also, if the impact is large, if the increase of the internal pressure due to the inertia is greater than the pressure decrease due to the vent after the first step, the bursting strength is greater than that of the primary vent hole. The second vent hole is formed by the second vent hole.

_{where t 1 and t 2 are the} initial and final times (in seconds) of the interval during which HIC attains a maximum value, and acceleration a is measured in g s (standard gravity acceleration). The maximum time duration of HIC, t ₂ - t ₁ , is limited to a specific value between 3 and 36 ms, usually 15 ms.

At a HIC of 1000, there is an 18% probability of a severe head injury, a 55% probability of a serious injury, and a 90% probability of a moderate head injury.

It is necessary to reduce the depreciation rate to reduce the experimental calculated HIC to calculate the impact on the human body in the event of a collision. In the present invention, ventilation due to a certain size, preferential rupture of a specific portion of a specially designed woven fabric of an airbag over a certain pressure results in a reduction in the magnitude of the acceleration, resulting in a smaller HIC.

A specific description of the present invention is that when the internal pressure due to the air expansion of the airbag increases during impact-inflation, the fabric density of the airbag is woven at the lowest level so that a specific region with low rupture strength is preferentially ruptured, The weft is designed to be so small that the weft yarns and weft yarns are not interlaced but are floating in a specific position. If the surface density of the airbag is at least 20% of the normal tissue in the light and weft direction, the strength of the coating on the coating is reduced to as low as 0.2 ^ 2 or 4% That part will lead to rupture preferentially. It is a key basis of the present invention to design the jacquard to be floating at a certain ratio in the weaving design in the light and weft direction. Also, by adjusting the size of the floating part of a certain ratio, the degree of ventilation by the size of the ruptured part can be controlled first. This primary ventilation reduces the acceleration, and when the internal pressure due to the inertia of the impacting object continues to increase, then the floating is designed so that the less weakly designed part will secondaryly burst and reduce the acceleration again.

In general, the present invention relates to a method of designing a specific size of a specific size of a floating weave design at a specific region to be firstly ruptured and designing floating, To have a rupture.

From the technology of the present invention, by showing the buffering effect of the airbag which is the most efficient by the size of the airbag of the same material and the amount of air upon inflation, the following practical effect can be expected. That is, it is an effect of reducing the size of the airbag required to buffer the same amount of impact and the amount of air in the inflator, or buffering a larger amount of impact with the amount of inflator air, such as airbags of the same size, made of the same material.

By controlling the strength of the fabric, it is possible to make shock absorption with a large impact even with a small size. That is, in order to be protected by general fabric at a height of 10 layers, it is necessary to form a very large air bag and to form a proper internal pressure, a very large amount of gas is required, and the gas cylinder is large and heavy. However, when this technology is applied to high-strength fabrics such as p-Aramid, Polyarylate, PBO, UHMWPE, etc., small impact-efficient airbags are produced.

Claims (4)

An airbag having a fabric having at least two regions having different breaking strengths;
An acceleration sensor for sensing movement of a user;
An inflator for injecting gas into the airbag and having an exhaust valve and an intake valve;
A pressure sensor for measuring a gas pressure in the airbag; And
Wherein when the value measured by the acceleration sensor reaches a fall reference value, the inflator is operated to inject gas into the airbag, and the exhaust valve and the intake valve are selectively And a control unit that operates the airbag. The method according to claim 1,
Further comprising a gravity sensor for measuring a height of the user's position. The method according to claim 1,
Wherein the rupture strength is adjusted by changing the interlacing structure of the warp and weft. The method of claim 3,
Wherein the change in the interlacing structure of the warp and weft yarns is determined by the number of interlacing crossings of the warp and weft yarns.

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