Array type laser ignition system and method for safety airbag gas generator

Abstract

The invention discloses an array type laser ignition system and method for a safety air bag gas generator. The system comprises a collision sensor, a central control system, an array type laser emission assembly, an external pipe shell and a safety air bag. The array type laser emitting assembly comprises a positive electrode shell, a negative electrode shell, a laser semiconductor light-emitting chip array plate, a gold wire, a lens sleeve shell, a collimating lens and a focusing lens. Laser semiconductor light-emitting chips are distributed on the laser semiconductor light-emitting chip array plate in an array manner; the ignition method comprises the steps that when an automobile is collided, the collision sensor detects collision force, a signal of the collision force is transmitted to the central control unit, the central control unit judges the collision state according to the amplitude and time of the signal and preset parameters, and the central control unit sends an ignition signal mode of the array according to the collision state. The ignition output form and the output energy are controllable, and the situation that the safety air bag stops working due to the fact that a single ignition element breaks down is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of gas generators, and in particular to an array laser ignition system and method for a safety airbag gas generator. Background Art

[0002] The continuous development of the automobile industry has brought convenience to people's lives, but it has also brought many traffic safety hazards, which has made automobile safety technology a focus of attention. Airbags are currently a mainstream vehicle safety protection device, playing a vital role in protecting the safety of drivers and passengers. When a car is hit to a considerable extent, its internal gas generator is activated after receiving an ignition signal, and gas is quickly generated. The gas fills the airbag, and the airbag pops out to provide a cushion for the people in the car.

[0003] At present, new airbag products are no longer limited to protecting the driver in the car, but can provide all-round safety protection for other passengers in the car and pedestrians outside the car. For example, the side airbag can be quickly inflated when the vehicle is in a side collision to protect the head, chest and waist of the passengers; the curtain airbag can be deployed when the vehicle rolls over, covering the entire side window to prevent the passenger's head from hitting the window glass; the windshield airbag can be quickly inflated when the vehicle is in a frontal collision to protect the driver's head from impact. These new airbag products have higher requirements for inflation speed, pressure and inflation volume to ensure that they can be deployed in a timely and effective manner when a collision occurs and provide sufficient protection; when the vehicle collides with a pedestrian, the arc airbag will be quickly inflated to form an arc structure, covering the lower edge of the windshield and the A-pillar, reducing the impact on the pedestrian's head and upper body, and reducing the risk of head and upper body injuries.

[0004] In order to meet the performance requirements of new airbag products, traditional low-energy electric ignition tubes are no longer competent. At the same time, for different collision scenarios and different protection objects, the airbag's action mode is required to be more diversified and intelligent. Therefore, the development of a new airbag ignition system has become one of the key technologies to improve airbag performance.

[0005] At present, the gas generator mainly uses electric ignition tubes. Its principle is that the electric heating bridge wire heats up rapidly when the ignition current passes through it, igniting the ignition powder. The huge heat generated by the ignition powder catalyzes the next-level ignition powder, and the ignition powder then outputs flame energy to the gas-generating powder, which undergoes a chemical reaction to produce a large amount of gas. The existing electric ignition tube has low anti-electromagnetic interference ability. When the internal circuit system of the car is abnormal, electromagnetic pulses may be generated. When the electromagnetic pulses pass through the electric heating bridge wire, it may cause misfire.

[0006] Secondly, the response time of the traditional electric igniter is not fast enough: the traditional electric igniter needs to give the electric heating bridge wire a transient large current to heat the bridge wire to a certain temperature, first ignite the ignition powder, then the ignition powder ignites the ignition powder, and finally the ignition powder ignites the gas generating agent to fill the airbag. This complex ignition system not only increases the cost, but may also cause ignition delay or failure, affecting the normal function of the airbag.

[0007] Furthermore, traditional electric ignition tubes cannot resist electromagnetic interference: the ignition component of traditional electric ignition tubes is an electric heating bridge wire, which is very likely to cause accidental ignition after being interfered by electromagnetic pulses, causing the airbag to pop out in non-emergency situations, and cannot ensure the normal operation of the car airbag system in an environment with electromagnetic interference.

[0008] The airbag's working mode is not intelligent: Relevant studies have shown that in traffic accidents, the driver may be injured by the airbag system. Because when a collision occurs, the gas launcher relies on the chemical reaction of gunpowder combustion to quickly produce gas under the action of high temperature and high pressure, and the airbag pops out at a speed of more than 200km per hour. However, if the speed is too fast, the people in the car who are close to the airbag will be impacted by the popped airbag, which may cause secondary injuries to the people in the car. At the same time, because the structure of the airbag is designed to start exhausting at the same time as inflation, when the car is in a long-term impact, the airbag will exhaust the gas in advance and cannot provide continuous protection to the people in the car or pedestrians outside the car.

[0009] Therefore, there is an urgent need for an array laser ignition system and method for a gas generator of an airbag to improve the anti-electromagnetic interference capability and safety of the airbag. Summary of the invention

[0010] Purpose of the invention: In view of the deficiencies in the prior art, the purpose of the present invention is to propose an array laser ignition system and method for an airbag gas generator. The laser emitted by the laser semiconductor light-emitting chip array board is anti-electromagnetic interference, thereby avoiding the accidental ignition of the igniter when there is a complex electromagnetic environment outside the new energy vehicle; the central control system adopted controls the output mode of the array laser system according to the received collision signal, and realizes the controllable ignition output form and output energy, so that the airbag provides the best protection for the occupants and pedestrians outside the vehicle according to different situations; at the same time, the array laser ignition system is adopted to avoid the situation where a single ignition element fails and causes the airbag to stop working, thereby improving the anti-electromagnetic interference ability and safety of the airbag.

[0011] Technical solution: The array laser ignition system for the safety airbag gas generator of the present invention comprises a collision sensor, a central control system, an array laser emission component, an outer tube shell and a safety airbag;

[0012] The array-type laser emission assembly includes a positive electrode shell, a negative electrode shell, a laser semiconductor light-emitting chip array plate, a gold wire, a lens housing, a collimating lens and a focusing lens;

[0013] One end of the outer tube shell is equipped with a gas generating powder shell and a gas generating powder, and the other end is equipped with an ignition powder shell and an ignition powder, and the ignition powder is coated with a rupture film; the ignition powder shell and the array type laser emitting assembly are fixed in the outer tube shell;

[0014] Laser semiconductor light-emitting chips are distributed in an array on the laser semiconductor light-emitting chip array board.

[0015] The laser semiconductor light-emitting chip includes a first laser semiconductor light-emitting chip, a second laser semiconductor light-emitting chip, a third laser semiconductor light-emitting chip, a fourth laser semiconductor light-emitting chip and a fifth laser semiconductor light-emitting chip which are arrayed on a laser semiconductor light-emitting chip array board; the second laser semiconductor light-emitting chip is located at the center of the laser semiconductor light-emitting chip array board.

[0016] The ignition powder shell contains first ignition powder, second ignition powder, third ignition powder, fourth ignition powder and fifth ignition powder, and the second ignition powder is located at the center of the ignition powder shell.

[0017] The gas generating medicine shell contains the first gas generating medicine, the second gas generating medicine, the third gas generating medicine, the fourth gas generating medicine and the fifth gas generating medicine, and the second gas generating medicine is located at the center of the gas generating medicine shell.

[0018] The laser semiconductor light emitting chip adopts a vertical cavity surface emitting laser chip.

[0019] The outer tube shell is coated with a nylon covering body by injection molding.

[0020] The array laser ignition method for the safety airbag gas generator of the present invention is implemented by an array laser ignition system for the safety airbag gas generator. The laser ignition method comprises the following steps:

[0021] (1) When a car collides, the collision sensor transmits the detected impact force signal to the central control unit, which filters and amplifies the impact force signal, extracts the characteristic parameters of the impact force signal, and compares the characteristic parameter X of the impact force signal with the pre-set characteristic parameter Y. If X>Y, the airbag protection is triggered. The process is as follows:

[0022] (1.1) When the central control unit detects that the direction of the impact force is opposite to the direction of the vehicle's travel, the vehicle is in a passive collision. When the collision sensor detects that the acceleration increment is greater than 10g and the duration is between 10 and 50ms, the central control unit transmits a driving current to the laser semiconductor light-emitting chip arrays of all array-type laser ignition systems in the vehicle's internal airbags. All laser semiconductor light-emitting chips emit lasers at the same time. The lasers enter the collimating lens and become parallel lasers. The parallel lasers enter the focusing lens to form a focused laser beam. The focus of the laser beam ignites all the ignition powders at the same time and generates flames. The flames impact the rupture membrane and transfer heat to the gas generating powder. All the gas generating powders are heated at the same time to undergo chemical reactions to generate gas, causing the airbags to pop out.

[0023] (1.2) When the central control unit detects that the direction of the impact force is the same as the direction of the vehicle's travel, the vehicle is in an active collision. When the collision sensor detects that the acceleration increment reaches 2g to 6g and the infrared receiver senses the presence of a living body, the central control unit sends a driving current to the laser semiconductor light-emitting chip array of the array-type laser ignition system in the arc-shaped airbag outside the vehicle with a delay of 1ms to 3ms, so that the driving current flows into the airbag inside the vehicle from the positive electrode shell during the time of the vehicle collision, and flows out from the negative electrode shell through the laser semiconductor light-emitting chip on the laser semiconductor light-emitting chip array board. The second laser semiconductor light emitting chip, the first laser semiconductor light emitting chip, the third laser semiconductor light emitting chip, the fourth laser semiconductor light emitting chip and the fifth laser semiconductor light emitting chip emit lasers in sequence, and the lasers pass through the collimating lens and the focusing lens to form a laser beam, and the focus of the laser beam sequentially ignites the second ignition powder, the first ignition powder, the third ignition powder, the fourth ignition powder and the fifth ignition powder to generate flames, and the flames impact the rupture membrane to heat the second gas generating powder, the first gas generating powder, the third gas generating powder, the fourth gas generating powder and the fifth gas generating powder in sequence to generate chemical reactions to generate gas, so that the airbag pops open and expands.

[0024] In step (1), the characteristic parameters X of the signal include the magnitude of the impact force, the impact time, the impact speed and the number of impacts.

[0025] In step (1), the characteristic parameter Y pre-set in the central control unit includes a safety threshold, a time threshold, and a speed threshold.

[0026] The comparison formula between the characteristic parameter X of the signal and the preset characteristic parameter Y is:

[0027]

[0028] Working principle: The working process of the array laser ignition system for the airbag gas generator of the present invention is as follows: when the car collides, the collision sensor detects a strong impact force, and the signal of the impact force is transmitted to the central control unit. The central control unit determines the state of the collision according to the amplitude and time of the signal and the pre-set parameters, and the central control unit sends the array ignition signal mode according to the collision state. When the collision sensor detects that the acceleration increment reaches more than 10g and the duration is 10-50ms, the central control unit transmits the driving current to the array laser semiconductor light-emitting chips of all array laser emission systems, and the current value received by each chip reaches the maximum value of the laser energy. At this time, the ignition mode is multi-point array instant and rapid ignition, that is, multiple laser points act on different surfaces of the ignition powder at the same time. At this time, multiple ignition powders act to uniformly transfer the ignition energy to the gas-generating powder to avoid the explosion phenomenon caused by excessive single-point ignition energy, so that the airbag is quickly but uniformly covered by the gas generated by the gas-generating powder, avoiding the strong impact of the airbag causing harm to the people in the car.

[0029] When the collision sensor detects that the acceleration increment reaches 2g~6g and the infrared receiver senses the presence of a living organism, the central control unit transmits driving current to the array laser semiconductor light-emitting chips of all array laser emitting systems, but different chips have a sequence in the time for transmitting the driving current. At this time, the ignition method is multi-point array instant and continuous ignition, that is, multiple laser points act on different surfaces of the ignition powder in succession. At this time, multiple ignition powders act in succession, and the ignition energy will be continuously transferred to the gas-producing powder for a period of time, and there is continuous gas generation, ensuring that when the car is in a long impact process, the airbag is guaranteed to be filled for a long time, protecting the occupants and reducing the risk of injury to pedestrians outside the car.

[0030] The positive electrode shell and the negative electrode shell in the array laser emission assembly are used to receive the driving current output by the central control unit. The laser semiconductor light-emitting chip array board, the collimating lens and the focusing lens are installed on the same axis. There are multiple laser semiconductor light-emitting chips arranged in an array on the laser semiconductor light-emitting chip array board. Since the laser beam emitted by the laser semiconductor light-emitting chip has a certain divergence angle, a collimating lens is placed at the front end of the laser semiconductor light-emitting chip array board to collimate the divergent laser beam into parallel light, and then the parallel light enters the focusing lens. Under the action of the focusing lens, multiple parallel laser beams converge on multiple ignition powder surfaces to achieve the purpose of multi-point laser ignition. Multiple ignition powders generate powerful energy under the action of multi-point lasers. The energy acts on the gas-generating powder in the form of flame impact. The gas-generating powder quickly undergoes a chemical reaction to produce a large amount of gas. The gas enters the airbag, causing the airbag to pop out to protect the safety of the people on and inside the vehicle.

[0031] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0032] (1) High energy output and high response speed: The laser beam emitted by the laser semiconductor of the present invention is focused into a very small light spot through a collimating lens and a focusing lens. The light spot has a high energy density and can directly act on the ignition powder to make the ignition powder react, thereby simplifying the ignition system, improving the response speed and the anti-electromagnetic interference capability of the ignition system, and can be reused.

[0033] (2) High safety and high reliability: The laser emitted by the laser semiconductor light-emitting chip array board in the present invention is resistant to electromagnetic interference, and the energy propagation in the laser ignition system is carried out through the laser beam, which has high directionality, and the energy is only propagated in a specific direction, reducing interference in other directions. In addition, the frequency of the light wave emitted by the laser semiconductor is much higher than the common electromagnetic interference frequency and is not interfered with, thus avoiding the accidental ignition of the igniter when there is a complex electromagnetic environment outside the new energy vehicle.

[0034] (3) The present invention uses multiple array-distributed laser semiconductor light-emitting chips to make the laser ignition method intelligent and controllable, which not only increases the energy output of the laser, but also improves the safety and reliability of the system. At the same time, the array laser ignition system used avoids the situation where a single ignition element fails and causes the airbag to stop working, thereby improving the reliability of the airbag.

[0035] (4) Intelligent control: Depending on the collision situation encountered by the car, the collision sensor will sense different collision signals in different forms. The car's central control system controls the output mode of the array laser system based on the received collision signal, making the ignition output form and output energy controllable, so that the airbag can provide the best protection for the occupants and pedestrians outside the car in different situations. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a flow chart of the array laser ignition method for the safety airbag gas generator of the present invention;

[0037] Figure 2 It is a structural schematic diagram of an array laser ignition system for a safety airbag gas generator of the present invention;

[0038] Figure 3 It is a schematic cross-sectional view of the structure of the array-type laser emitting assembly of the present invention;

[0039] Figure 4 It is a schematic diagram of the structure of the ignition powder casing and the ignition powder of the present invention;

[0040] Figure 5 It is a schematic diagram of the structure of the gas generating agent shell and the gas generating agent of the present invention;

[0041] Figure 6It is a structural schematic diagram of the laser semiconductor light-emitting chip array board in the array-type laser emitting assembly of the present invention. DETAILED DESCRIPTION

[0042] like Figures 1 to 6 As shown, the array laser ignition system for the airbag gas generator of the present invention includes a collision sensor, a central control system, an array laser emitting assembly 1, an outer tube shell 15 and an airbag.

[0043] The array type laser ignition system for the safety airbag gas generator of the present invention is located in the safety airbag inside the car and in the safety airbag outside the car.

[0044] like Figure 2 As shown, the outer tube shell 15 is coated with a gas generating charge shell 14, a gas generating charge 13, a rupture membrane 12, an ignition charge 11, an ignition charge shell 10 and an array-type laser emitting assembly 1. The outer tube shell 15 is coated with a nylon coating body 9 by injection molding. The gas generating charge shell 14 and the gas generating charge 13 are loaded at one end of the outer tube shell 15, and the ignition charge 11 is loaded at the other end. In this embodiment, the ignition charge shell 10 and the array-type laser emitting assembly 1 are fixed inside the outer tube shell 15 by laser welding.

[0045] like Figure 4 As shown, the ignition powder shell 10 contains a first ignition powder 11 - 1 , a second ignition powder 11 - 2 , a third ignition powder 11 - 3 , a fourth ignition powder 11 - 4 and a fifth ignition powder 11 - 5 , and the second ignition powder 11 - 2 is located at the center of the ignition powder shell 10 .

[0046] like Figure 5 As shown, the gas generating agent shell 14 contains a first gas generating agent 13-1, a second gas generating agent 13-2, a third gas generating agent 13-3, a fourth gas generating agent 13-4 and a fifth gas generating agent 13-5; the second gas generating agent 13-2 is located at the center of the gas generating agent shell.

[0047] In this embodiment, the total weight of the ignition charge 11 and the gas generating charge 13 is 5g to 20g. The material of the outer tube shell 15 is selected from high-quality copper shell. The material of the gas generating charge shell 14 and the ignition charge shell 10 is selected from stainless steel. The nylon sheath 9 is selected from nylon material with high temperature resistance and impact resistance.

[0048] like Figure 3 As shown, the array laser emitting assembly 1 includes a positive electrode housing 2, a negative electrode housing 3, a laser semiconductor light emitting chip array board 4, a gold wire 5, a lens housing 6, a collimating lens 7 and a focusing lens 8. The schematic diagram of the laser semiconductor light emitting chip array board 4 is shown in FIG. Figure 6As shown, the laser semiconductor light emitting chip array board 4 is arrayed with a first laser semiconductor light emitting chip 16-1, a second laser semiconductor light emitting chip 16-2, a third laser semiconductor light emitting chip 16-3, a fourth laser semiconductor light emitting chip 16-4 and a fifth laser semiconductor light emitting chip 16-5; the second laser semiconductor light emitting chip 16-2 is located at the center of the laser semiconductor light emitting chip array board 4.

[0049] The ignition powder shell 10 contains a first ignition powder 11 - 1 , a second ignition powder 11 - 2 , a third ignition powder 11 - 3 , a fourth ignition powder 11 - 4 and a fifth ignition powder 11 - 5 . The second ignition powder 11 - 2 is located at the center of the ignition powder shell 14 .

[0050] The gas generating agent shell 14 contains a first gas generating agent 13-1, a second gas generating agent 13-2, a third gas generating agent 13-3, a fourth gas generating agent 13-4 and a fifth gas generating agent 13-5, and the second gas generating agent 13-2 is located at the center of the gas generating agent shell.

[0051] The positive electrodes of the laser semiconductor light-emitting chips 16 are led out separately, and the negative electrodes are integrated and led to the gold wire 5 in the manner shown in the figure. The gold wire 5 is connected to the positive electrode shell 2 and the negative electrode shell 3 to receive the driving current sent by the central control system.

[0052] The laser semiconductor light-emitting chip 16 uses a vertical cavity surface emitting laser chip, which emits light vertically from the top surface of the chip. It has the advantages of small size, low cost, good temperature stability and high beam quality. The size of the single chip is within 1mm*1mm*0.1mm~0.5mm, and the output laser power is 3w. The collimating lens 7 and the focusing lens 8 are made of glass aspherical lenses, and the loss rate of the laser passing through is low. The energy density of the laser focus after passing through the collimating lens 7 and the focusing lens 8 reaches 10 4 w / cm 2 of magnitude.

[0053] The array laser ignition method for the airbag gas generator of the present invention is as follows:

[0054] (1) When a car collides, the collision sensor detects the impact force and transmits the impact force signal to the central control unit; the central control unit filters and amplifies the impact force signal, extracts the characteristic parameters of the impact force signal, and compares the characteristic parameter X of the impact force signal with the pre-set characteristic parameter Y. If X>Y, the airbag protection is triggered.

[0055] Among them, the characteristic parameter X includes the magnitude of the impact force, the impact time, the impact speed and the number of impacts. The characteristic parameters pre-set in the central control unit include: the safety threshold, which determines whether the force magnitude threshold triggers the airbag and other protective measures. The time threshold, which determines whether the time of force action during the collision reaches the conditions for triggering protective measures. The speed threshold, which determines whether the speed change during the collision reaches the conditions for triggering protective measures. The comparison formula where the characteristic parameter of the signal is X (such as the magnitude of the impact force) and the pre-set parameter is Y (such as the safety threshold) is expressed as:

[0056]

[0057] Compare the characteristic parameter X of the signal with the preset parameter Y. If X>Y, the airbag protection measure is triggered. If X≤Y, the protection measure is not triggered.

[0058] The process of triggering airbag protection is as follows:

[0059] (1.1) Determine whether the collision is an active collision or a passive collision. When the central control unit detects that the direction of the impact force is opposite to the direction of the vehicle's travel, it indicates that the vehicle has been hit by another object. If the direction of the impact force is the same as the direction of the vehicle's travel, the vehicle actively hits another object. Further judgment is made based on the collision time. The signal change time window for a passive collision is shorter, and the signal time for an active collision will last longer because the driver stepped on the accelerator before the collision.

[0060] According to the impact state, the central control unit sends a corresponding ignition signal driving current to the laser array system.

[0061] When the central control unit determines that the car is in a passive collision state, the central control unit sends a driving current to all array laser ignition systems in the car's internal airbags, causing the airbags in the car to pop out quickly and uniformly.

[0062] When the central control unit determines that the car is in an active collision state or a passive collision state, the central control unit sends a driving current to the array laser ignition system, and the array laser ignition system makes the gas generating agent work to supply air to the airbag. The process is as follows: the driving current flows in from the positive electrode shell 2, passes through the laser semiconductor light emitting chip 16 on the laser semiconductor light emitting chip array board 4, and then flows out from the negative electrode shell 3. The laser semiconductor light emitting chip 16 emits laser light under the action of the driving current. The laser light emitted by the laser semiconductor light emitting chip 16 has a divergence angle. The laser light enters the collimating lens 7 and becomes a parallel laser light. The parallel laser light enters the focusing lens 8 and is focused. The focus of the focused laser beam falls on the surface of the corresponding ignition agent 11. The energy density of the laser focus is huge to form a high-temperature hot spot. The hot spot ignites the ignition agent 11 to generate flames. The gunpowder impacts the rupture film 12 to transfer heat to the gas generating agent 13. The gas generating agent 13 undergoes a chemical reaction under the heat to generate gas and sprays out, so that the airbag pops open and expands, protecting the safety of the people on the vehicle and pedestrians outside the vehicle.

[0063] When the car is in a passive collision state, when the collision sensor detects that the acceleration increment is greater than 10g and the duration is between 10 and 50ms, the central control unit transmits a driving current to all laser semiconductor light-emitting chip arrays, and the first laser semiconductor light-emitting chip 16-1, the second laser semiconductor light-emitting chip 16-2, the third laser semiconductor light-emitting chip 16-3, the fourth laser semiconductor light-emitting chip 16-4 and the fifth laser semiconductor light-emitting chip 16-5 emit light at the same time, through the collimating lens 7 and the focusing lens 8, the huge energy density at the focus of the laser beam is focused. The first ignition powder 11-1, the second ignition powder 11-2, the third ignition powder 11-3, the fourth ignition powder 11-4 and the fifth ignition powder 11-5 are ignited at the same time to generate flames. The flame impacts the rupture film 12 to transfer heat to the gas generating powder 13. The first gas generating powder 13-1, the second gas generating powder 13-2, the third gas generating powder 13-3, the fourth gas generating powder 13-4 and the fifth gas generating powder 13-5 are heated at the same time to undergo chemical reactions to generate gas, so that the airbag is quickly but uniformly covered by the gas generated by the gas generating powder, avoiding the strong impact of the airbag to cause harm to the occupants.

[0064] When the car is in an active collision state, when the collision sensor detects that the acceleration increment reaches 2g~6g and the infrared receiver senses the presence of a living body, the central control unit sends a driving current to the laser semiconductor light-emitting chip array with a delay of 1ms~3ms in sequence, and the laser semiconductor light-emitting chips emit light in the order of the second laser semiconductor light-emitting chip 16-2, the first laser semiconductor light-emitting chip 16-1, the third laser semiconductor light-emitting chip 16-3, the fourth laser semiconductor light-emitting chip 16-4 and the fifth laser semiconductor light-emitting chip 16-5, and the energy at the focus of the laser beam is focused through the collimating lens 7 and the focusing lens 8. Under the action of the mass density, the second ignition powder 11-2, the first ignition powder 11-1, the third ignition powder 11-3, the fourth ignition powder 11-4 and the fifth ignition powder 11-5 are ignited in sequence to generate flames, and the flame impacts the rupture membrane 12 to transfer heat to the gas generating powder 13, and the second gas generating powder 13-2, the first gas generating powder 13-1, the third gas generating powder 13-3, the fourth gas generating powder 13-4 and the fifth gas generating powder 13-5 are heated in sequence to undergo chemical reactions to generate gas, so that the airbag is filled with gas for a longer period of time, avoiding the situation in which the airbag discharges all the gas and cannot protect the occupants of the vehicle or pedestrians outside the vehicle when the dangerous situation has not been resolved.

Claims

1. An array laser ignition system for an airbag gas generator, characterized in that: It comprises a collision sensor, a central control system, an array laser emission component (1), an external tube shell (15) and a safety airbag; The array-type laser emitting assembly (1) comprises a positive electrode housing (2), a negative electrode housing (3), a laser semiconductor light-emitting chip array plate (4), a gold wire (5), a lens housing (6), a collimating lens (7) and a focusing lens (8); One end of the outer tube shell (15) is equipped with a gas generating powder shell (14) and a gas generating powder (13), and the other end is equipped with an ignition powder shell (10) and an ignition powder (11), and the ignition powder (11) is coated with a rupture film (12); the ignition powder shell (10) and the array-type laser emitting assembly (1) are fixed in the outer tube shell (15); Laser semiconductor light-emitting chips (16) are distributed in an array on the laser semiconductor light-emitting chip array plate (4).

2. The array laser ignition system for airbag gas generator according to claim 1, characterized in that: The laser semiconductor light-emitting chip (16) comprises a first laser semiconductor light-emitting chip (16-1), a second laser semiconductor light-emitting chip (16-2), a third laser semiconductor light-emitting chip (16-3), a fourth laser semiconductor light-emitting chip (16-4) and a fifth laser semiconductor light-emitting chip (16-5) which are arrayed and distributed on a laser semiconductor light-emitting chip array board (4); the second laser semiconductor light-emitting chip (16-2) is located at the center of the laser semiconductor light-emitting chip array board (4).

3. The array laser ignition system for airbag gas generator according to claim 1, characterized in that: The ignition powder shell (10) contains a first ignition powder (11-1), a second ignition powder (11-2), a third ignition powder (11-3), a fourth ignition powder (11-4) and a fifth ignition powder (11-5), wherein the second ignition powder (11-2) is located at the center of the ignition powder shell (14).

4. The array laser ignition system for airbag gas generator according to claim 1, characterized in that: The gas generating agent shell (14) contains a first gas generating agent (13-1), a second gas generating agent (13-2), a third gas generating agent (13-3), a fourth gas generating agent (13-4) and a fifth gas generating agent (13-5), wherein the second gas generating agent (13-2) is located at the center of the gas generating agent shell.

5. The array laser ignition system for airbag gas generator according to claim 1, characterized in that: The laser semiconductor light-emitting chip (16) adopts a vertical cavity surface emitting laser chip.

6. The array laser ignition system for airbag gas generator according to claim 1, characterized in that: The outer tube shell (15) is coated with a nylon covering body (9) by injection molding.

7. An array laser ignition method for an airbag gas generator, implemented by the array laser ignition system for an airbag gas generator according to claim 1, characterized in that: The method comprises the following steps: (1) When a car collides, the collision sensor transmits the detected impact force signal to the central control unit, which filters and amplifies the impact force signal, extracts the characteristic parameters of the impact force signal, and compares the characteristic parameter X of the impact force signal with the pre-set characteristic parameter Y. If X>Y, the airbag protection is triggered. The process is as follows: (1.1) When the central control unit detects that the direction of the impact force is opposite to the direction of the vehicle's travel, the vehicle is in a passive collision. When the collision sensor detects an acceleration increment of >10g and the duration is between 10 and 50ms, the central control unit transmits a driving current to the laser semiconductor light-emitting chip arrays of all array-type laser ignition systems in the vehicle's internal airbags. All laser semiconductor light-emitting chips (16) emit lasers at the same time. The lasers enter the collimating lens (7) and become parallel lasers. The parallel lasers enter the focusing lens (8) to form a focused laser beam. The focus of the laser beam simultaneously ignites all ignition powders and generates flames. The flame impacts the rupture membrane (12) to transfer heat to the gas generating powder (13). All the gas generating powders are heated at the same time to undergo a chemical reaction to generate gas, causing the airbag to pop out. (1.2) When the central control unit detects that the direction of the impact force is the same as the direction of travel of the vehicle, the vehicle is in an active collision. When the collision sensor detects that the acceleration increment reaches 2g to 6g and the infrared receiver senses the presence of a biological body, the central control unit sends a driving current to the laser semiconductor light-emitting chip array of the array-type laser ignition system in the arc-shaped airbag outside the vehicle with a delay of 1ms to 3ms, so that the driving current flows into the airbag inside the vehicle from the positive electrode shell (2) during the time of the vehicle collision, and flows out from the negative electrode shell (3) through the laser semiconductor light-emitting chip (16) on the laser semiconductor light-emitting chip array board (4); the second laser semiconductor light-emitting chip (16-2), the first laser semiconductor light-emitting chip (16-1), and the third laser semiconductor light-emitting chip (16-2) are connected to the laser semiconductor light-emitting chip array board (16-1). The chip (16-3), the fourth laser semiconductor light emitting chip (16-4) and the fifth laser semiconductor light emitting chip (16-5) emit lasers in sequence, and the lasers are formed into a focused laser beam through a collimating lens (7) and a focusing lens (8). The focus of the laser beam sequentially ignites the second ignition powder (11-2), the first ignition powder (11-1), the third ignition powder (11-3), the fourth ignition powder (11-4) and the fifth ignition powder (11-5) to generate flames, and the flames impact the rupture film (12) so that the second gas generating powder (13-2), the first gas generating powder (13-1), the third gas generating powder (13-3), the fourth gas generating powder (13-4) and the fifth gas generating powder (13-5) are heated in sequence to generate chemical reactions to generate gas, so that the airbag is ejected and expanded.

8. The array laser ignition method for an airbag gas generator according to claim 7, characterized in that: In step (1), the characteristic parameter X of the signal includes the magnitude of the impact force, the impact time, the impact speed and the number of impacts.

9. The array laser ignition method for an airbag gas generator according to claim 7, characterized in that: In step (1), the characteristic parameter Y pre-set in the central control unit includes a safety threshold, a time threshold, and a speed threshold.

10. The array laser ignition method for an airbag gas generator according to claim 7, characterized in that: The comparison formula is:

Images