An arrayed laser ignition system and method for an airbag inflator

Abstract

The application discloses an array type laser ignition system and method for an airbag gas generator, and the system comprises a collision sensor, a central control system, an array type laser emission assembly, an outer pipe shell and an airbag; the array type laser emission assembly comprises a positive electrode shell, a negative electrode shell, a laser semiconductor light emitting chip array plate, gold wires, a lens sleeve, a collimating lens and a focusing lens; the laser semiconductor light emitting chip array plate is arrayed with laser semiconductor light emitting chips; and the ignition method is as follows: when a car collides, the collision sensor detects the impact force, the signal of the impact force is transmitted to the central control unit, the central control unit judges the impact state according to the amplitude and time of the signal and the parameters set in advance, and the central control unit sends the array type ignition signal mode according to the impact state. The application realizes controllable ignition output form and output energy, and avoids the situation that the single ignition element failure leads to the airbag stop working.

Description

Technical Field

[0001] This invention relates to the field of gas generator technology, and in particular to an array-type laser ignition system and method for an airbag gas generator. Background Technology

[0002] While the continuous development of the automotive industry has brought convenience to people's lives, it has also brought many traffic safety hazards, making automotive safety technology a focus of attention. Airbags, currently a mainstream vehicle safety device, play a crucial role in protecting the safety of drivers and passengers. When a car suffers a significant impact, its internal gas generator is activated upon receiving an ignition signal, rapidly producing gas. The gas fills the airbag, which then deploys, providing cushioning for the occupants.

[0003] Currently, new airbag products are no longer limited to protecting the driver inside the vehicle, but can provide comprehensive safety protection for other passengers inside the vehicle and pedestrians outside. For example, side airbags can inflate rapidly in the event of a side collision, protecting passengers' heads, chests, and waists; curtain airbags can deploy during a rollover, covering the entire side window to prevent passengers' heads from hitting the window glass; windshield airbags can inflate rapidly in the event of a frontal collision, protecting the driver's head from impact. These new airbag products have higher requirements for inflation speed, pressure, and inflation volume to ensure timely and effective deployment and provide sufficient protective force in the event of a collision; curved airbags, when a vehicle collides with a pedestrian, inflate rapidly to form an arc-shaped structure covering the lower edge of the windshield and the A-pillar, reducing the impact on the pedestrian's head and upper body, and lowering the risk of head and upper body injuries.

[0004] To meet the performance requirements of new airbag products, traditional low-energy electric ignition tubes are no longer sufficient. Furthermore, different collision scenarios and different objects require airbags to have more diverse and intelligent activation mechanisms. Therefore, developing new airbag ignition systems has become one of the key technologies for improving airbag performance.

[0005] Current gas generators primarily use electric ignition tubes. Their principle is that the heating bridge wire rapidly heats up when an ignition current passes through it, igniting the igniter. The immense heat generated by the igniter catalyzes the next stage ignition charge, which then provides flame energy to the gas-generating charge, causing a chemical reaction that produces a large amount of gas. However, existing electric ignition tubes have low electromagnetic interference resistance. When the vehicle's internal electrical system malfunctions, electromagnetic pulses may be generated. If these pulses pass through the heating bridge wire, they can cause accidental ignition.

[0006] Secondly, the response time of traditional electric ignition tubes is not fast enough: traditional electric ignition tubes require a large instantaneous current to heat the heating bridge wire to a certain temperature, first igniting the ignition propellant, then the ignition propellant, and finally the ignition propellant igniting the gas-generating agent to inflate the airbag. This complex ignition system not only increases costs but may also lead to ignition delays or failures, affecting the normal functioning of the airbag.

[0007] Furthermore, traditional electric ignition tubes are not resistant to electromagnetic interference: the ignition component of traditional electric ignition tubes is a heating bridge wire, which is prone to false ignition when subjected to electromagnetic pulse interference, causing the airbag to deploy in non-emergency situations. This makes it impossible to guarantee the normal operation of the car's airbag system in environments with electromagnetic interference.

[0008] Airbag deployment is not always intelligent: Studies have shown that drivers may be injured by airbag systems in traffic accidents. When a collision occurs, the gas emitter rapidly generates gas under high temperature and pressure through a chemical reaction caused by the combustion of gunpowder, and the airbag deploys at speeds exceeding 200 km / h. However, at such high speeds, occupants approaching the airbag may suffer secondary injuries from the impact of the deployed airbag. Furthermore, because airbags are designed to inflate and deflate simultaneously, during prolonged impacts, the airbag may prematurely deplete its gas, failing to provide sustained protection for occupants or pedestrians outside the vehicle.

[0009] Therefore, there is an urgent need for an array-type laser ignition system and method for gas generators used in airbags to improve the electromagnetic interference resistance and safety of airbags. Summary of the Invention

[0010] Purpose of the Invention: Addressing the shortcomings of existing technologies, the purpose of this invention is to propose an array-type laser ignition system and method for airbag gas generators. This system utilizes a laser semiconductor light-emitting chip array board to emit laser light, which resists electromagnetic interference, preventing accidental ignition of the igniter in complex electromagnetic environments outside new energy vehicles. The central control system controls the output mode of the array laser system based on received impact signals, achieving controllable ignition output form and energy. This allows the airbag to provide optimal protection for occupants and pedestrians in different situations. Furthermore, the array-type laser ignition system prevents the airbag from malfunctioning due to a single ignition element failure, improving the airbag's electromagnetic interference resistance and safety.

[0011] Technical solution: The array-type laser ignition system for airbag gas generators of the present invention includes a collision sensor, a central control system, an array-type laser emitting assembly, an outer casing, and an airbag;

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

[0013] One end of the outer casing is equipped with a gas-generating propellant casing and a gas-generating propellant, and the other end is equipped with an ignition propellant casing and an ignition propellant, with a ruptured membrane covering the ignition propellant; the ignition propellant casing and the array-type laser emission assembly are fixed inside the outer casing;

[0014] The laser semiconductor light-emitting chip array board has laser semiconductor light-emitting chips distributed in an array.

[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 plate; the second laser semiconductor light-emitting chip is located at the center of the laser semiconductor light-emitting chip array plate.

[0016] The ignition charge package contains a first ignition charge, a second ignition charge, a third ignition charge, a fourth ignition charge, and a fifth ignition charge, with the second ignition charge located at the center of the ignition charge package.

[0017] The gas-producing agent casing contains a first gas-producing agent, a second gas-producing agent, a third gas-producing agent, a fourth gas-producing agent, and a fifth gas-producing agent, with the second gas-producing agent located at the center of the gas-producing agent casing.

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

[0019] The outer casing is covered with a nylon cover by injection molding.

[0020] The present invention discloses an array-type laser ignition method for an airbag gas generator, implemented by an array-type laser ignition system for an airbag gas generator, comprising the following steps:

[0021] (1) When a car collision occurs, the collision sensor transmits the detected 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 preset 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 vehicle travel, the vehicle is in a passive impact. When the collision sensor detects an acceleration increment > 10g and the duration is between 10 and 50ms, the central control unit sends a driving current to the laser semiconductor light-emitting chip array of all array-type laser ignition systems in the vehicle's internal airbag. All the laser semiconductor light-emitting chips emit lasers at the same time. The laser enters the collimating lens and becomes a parallel laser. The parallel laser enters the focusing lens to form a focused laser beam. The focal point of the focused laser beam ignites all the ignition propellants and generates a flame. The flame impacts the rupture membrane and transfers heat to the gas-generating propellants. All the gas-generating propellants are heated at the same time and undergo a chemical reaction to generate gas, causing the airbag to deploy.

[0023] (1.2) When the central control unit detects that the direction of the impact force is the same as the vehicle's direction of travel, indicating an active impact, and when the collision sensor detects an acceleration increment of 2g to 6g and the infrared receiver senses a living organism, 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 external curved airbag of the vehicle, with a delay of 1ms to 3ms. This allows the driving current inside the airbag to flow from the positive electrode shell into the airbag during the vehicle's impact time, and then flow from the negative electrode shell through the laser semiconductor light-emitting chip on the laser semiconductor light-emitting chip array board. The second, first, third, fourth, and fifth laser semiconductor light-emitting chips emit lasers in sequence. The lasers pass through a collimating lens and a focusing lens to form a laser beam. The focal point of the laser beam ignites the second, first, third, fourth, and fifth ignition propellants in sequence to produce a flame. The flame impacts and ruptures the membrane, causing the second, first, third, fourth, and fifth gas-producing propellants to be heated in sequence, undergoing a chemical reaction to produce gas, which causes the airbag to deploy and inflate.

[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 pre-set characteristic parameter Y in the central control unit includes a safety threshold, a time threshold, and a speed threshold.

[0026] The formula for comparing the signal's characteristic parameter X with the pre-set characteristic parameter Y is:

[0027]

[0028] Working Principle: The working process of the array-type laser ignition system for the airbag gas generator of this invention is as follows: When a car collision occurs, the collision sensor detects a strong impact force. The impact force signal is transmitted to the central control unit. The central control unit determines the impact state based on the signal amplitude and time and preset parameters. The central control unit sends the array ignition signal according to the impact state. When the collision sensor detects an acceleration increment of more than 10g and a duration of 10-50ms, the central control unit sends a driving current to the array laser semiconductor light-emitting chips of all array laser emission systems. 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 instantaneous rapid ignition, that is, multiple laser points act on different surfaces of the ignition propellant at the same time. At this time, multiple ignition propellants act, and the ignition energy is evenly transferred to the gas-generating propellant to avoid the phenomenon of deflagration caused by excessive energy from a single point of ignition. This allows the airbag to be quickly but evenly covered by the gas generated by the gas-generating propellant, avoiding the strong impact of the airbag from causing injury to the occupants of the vehicle.

[0029] When the collision sensor detects an acceleration increment of 2g to 6g and the infrared receiver senses a living organism, the central control unit sends driving current to the array laser semiconductor light-emitting chips of all array laser emitting systems. However, the timing of the driving current delivery to different chips varies. At this time, the ignition method is multi-point array instantaneous continuous ignition, that is, multiple laser points act on different surfaces of the ignition propellant in sequence. With multiple ignition propellants acting sequentially, the ignition energy will be continuously transferred to the gas-producing propellant for a period of time, resulting in continuous gas production. This ensures that the airbag remains fully inflated for a long time during a prolonged impact, protecting the occupants of the vehicle and reducing the risk of injury to pedestrians outside the vehicle.

[0030] The positive and negative electrode housings in the array-type laser emitting assembly are used to receive the drive current output from the central control unit. The laser semiconductor light-emitting chip array board, collimating lens, and focusing lens are mounted on the same axis. Multiple laser semiconductor light-emitting chips are arranged in an array on the laser semiconductor light-emitting chip array board. Because the laser beam emitted by the laser semiconductor light-emitting chips 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 diverging laser beam into parallel light. The parallel light then enters the focusing lens, and under the action of the focusing lens, multiple parallel laser beams converge on multiple ignition propellant surfaces, achieving multi-point laser ignition. Multiple ignition propellants generate powerful energy under the action of multiple lasers. This energy acts on the gas-generating propellant in the form of flame impact. The gas-generating propellant rapidly undergoes a chemical reaction to produce a large amount of gas. The gas enters the airbag, causing the airbag to deploy and protect the safety of the vehicle occupants.

[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 this invention is focused into a very small spot by collimating lens and focusing lens. The spot has high energy density and can directly act on the ignition propellant to make the ignition propellant react, 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 this 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 only propagates in a specific direction, reducing interference in other directions. In addition, the light wave frequency emitted by the laser semiconductor is much higher than the frequency of common electromagnetic interference, so it is not interfered with, avoiding the situation of accidental ignition of the igniter when there is a complex electromagnetic environment outside the new energy vehicle.

[0034] (3) The present invention employs multiple arrayed 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-type laser ignition system avoids the situation where the airbag stops working due to the failure of a single ignition element, thus improving the reliability of airbag operation.

[0035] (4) Intelligent control: The impact signals sensed by the impact sensors vary depending on the impact situation encountered by the car. The central control system of the car controls the output mode of the array laser system according to the received impact signal, so as to realize the controllable ignition output mode and output energy, and enable the airbag to provide the best protection for the people in the car and pedestrians outside the car in different situations. Attached Figure Description

[0036] Figure 1 This is a flowchart of the array-type laser ignition method for the airbag gas generator of the present invention;

[0037] Figure 2 This is a schematic diagram of the array-type laser ignition system for the airbag gas generator of the present invention;

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

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

[0040] Figure 5 This is a schematic diagram of the structure of the gas-generating drug casing and the gas-generating drug of the present invention;

[0041] Figure 6This is a schematic diagram of the structure of the laser semiconductor light-emitting chip array plate in the array-type laser emitting component of the present invention. Detailed Implementation

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

[0043] The array-type laser ignition system for airbag gas generators of the present invention is located inside the airbag inside the vehicle and inside the airbag outside the vehicle.

[0044] like Figure 2 As shown, the outer casing 15 encloses a gas-generating propellant casing 14, a gas-generating propellant 13, a rupture membrane 12, an ignition propellant 11, an ignition propellant casing 10, and an array-type laser emitting assembly 1. The outer casing 15 is externally encased in a nylon covering 9 via injection molding. One end of the outer casing 15 contains the gas-generating propellant casing 14 and the gas-generating propellant 13, and the other end contains the ignition propellant 11. In this embodiment, the ignition propellant casing 10 and the array-type laser emitting assembly 1 are fixed inside the outer casing 15 by laser welding.

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

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

[0047] In this embodiment, the total weight of the ignition charge 11 and the gas-generating charge 13 is between 5g and 20g. The outer casing 15 is made of high-quality copper. The gas-generating charge casing 14 and the ignition charge casing 10 are made of stainless steel. The nylon cover 9 is made of nylon material that is resistant to high temperatures and impacts.

[0048] like Figure 3 As shown, the array-type laser emitting assembly 1 includes a positive electrode housing 2, a negative electrode housing 3, a laser semiconductor light-emitting chip array plate 4, gold wires 5, a lens housing 6, a collimating lens 7, and a focusing lens 8. A schematic diagram of the laser semiconductor light-emitting chip array plate 4 is shown below. Figure 6As shown, the laser semiconductor light-emitting chip array board 4 has 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 arranged in an array; 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 charge casing 10 contains a first ignition charge 11-1, a second ignition charge 11-2, a third ignition charge 11-3, a fourth ignition charge 11-4, and a fifth ignition charge 11-5. The second ignition charge 11-2 is located at the center of the ignition charge casing 14.

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

[0051] The positive electrodes of the laser semiconductor light-emitting chip 16 are each led out, and the negative electrodes are integrated and led to the gold wire 5 as 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 from 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, offering advantages such as small size, low cost, good temperature stability, and high beam quality. The size of a single chip is within the range of 1mm*1mm*0.1mm to 0.5mm, with an output laser power of 3W. The collimating lens 7 and focusing lens 8 are aspherical lenses made of glass, resulting in low laser loss. The energy density of the laser focal point after passing through the collimating lens 7 and focusing lens 8 reaches 10-1. 4 w / cm 2 The magnitude.

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

[0054] (1) When a car is involved in a collision, 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 preset characteristic parameter Y. If X > Y, the airbag protection is triggered.

[0055] The characteristic parameter X includes the magnitude of the impact force, the impact time, the impact velocity, and the number of impacts. Pre-set characteristic parameters in the central control unit include: a safety threshold, which determines the force threshold required to trigger protective measures such as airbags; a time threshold, which determines whether the duration of the force during the collision meets the conditions for triggering protective measures; and a velocity threshold, which determines whether the velocity change during the collision meets the conditions for triggering protective measures. The comparison formula between the signal's characteristic parameter X (e.g., impact force magnitude) and the pre-set parameter Y (e.g., safety threshold) is expressed as:

[0056]

[0057] The signal's characteristic parameter X is compared with a pre-set parameter Y. If X > Y, the airbag protection is triggered. If X ≤ Y, the protection is not triggered.

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

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

[0060] Based on the impact status, the central control unit sends a corresponding ignition signal to the laser array system to drive the current.

[0061] When the central control unit determines that the car is in a passive impact state, it sends a driving current to all the array-type laser ignition systems in the car's airbags, causing the airbags to deploy quickly and uniformly.

[0062] When the central control unit determines whether the vehicle is in an active or passive collision state, it sends a driving current to the array-type laser ignition system. The array-type laser ignition system then activates the propellant to inflate the airbag. The process is as follows: the driving current flows into the positive electrode housing 2, through the laser semiconductor light-emitting chip 16 on the laser semiconductor light-emitting chip array plate 4, and then out from the negative electrode housing 3. Under the action of the driving current, the laser semiconductor light-emitting chip 16 emits a laser beam. The laser beam emitted by the laser semiconductor light-emitting chip 16 has a divergence angle. The laser beam enters the collimating lens 7 and becomes a parallel laser beam. The parallel laser beam then enters the focusing lens 8 and is focused. The focal point of the focused laser beam falls on the surface of the corresponding propellant 11. The high energy density of the laser focal point forms a high-temperature hot spot, which ignites the propellant 11 and produces a flame. The propellant impacts and ruptures the membrane 12, transferring heat to the propellant 13. The propellant 13 undergoes a chemical reaction upon heating, producing gas which is then ejected, causing the airbag to deploy and inflate, protecting the safety of the occupants and pedestrians outside the vehicle.

[0063] When a vehicle is subjected to a passive impact, and the collision sensor detects an acceleration increment > 10g for a duration of 10–50ms, the central control unit sends a drive current to all laser semiconductor light-emitting chip arrays. 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 simultaneously emit light. Through the collimating lens 7 and the focusing lens 8, the enormous energy density at the focal point of the focused laser beam is utilized... 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 simultaneously to produce a flame. The flame impacts and ruptures the membrane 12, transferring 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 simultaneously and undergo a chemical reaction to produce gas. This allows the airbag to be quickly but consistently covered by the gas produced by the gas-generating powder, preventing the strong impact of the airbag from causing injury to the occupants of the vehicle.

[0064] When a car is in an active collision state, when the collision sensor detects an acceleration increment of 2g to 6g and the infrared receiver senses a living organism, the central control unit sends a drive current to the laser semiconductor light-emitting chip array with a delay of 1ms to 3ms. The laser semiconductor light-emitting chips emit light sequentially 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. Through the collimating lens 7 and the focusing lens 8, the energy at the focal point of the laser beam is focused. Under the influence of 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 produce flames. The flames impact the ruptured membrane 12 and transfer heat to the gas-generating powder 13. 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 and undergo chemical reactions to produce gas. This allows the airbag to be filled with gas for a longer period of time, avoiding the situation where the airbag deflates and fails to protect the occupants or pedestrians outside the vehicle if the dangerous situation has not been resolved.

Claims

1. An ignition method for an array-type laser ignition system for an airbag gas generator, characterized in that: The ignition system includes a collision sensor, a central control system, an array-type laser emitting assembly (1), an outer casing (15), and an airbag; The array-type laser emitting assembly (1) includes a positive electrode shell (2), a negative electrode shell (3), a laser semiconductor light-emitting chip array plate (4), gold wire (5), a lens shell (6), a collimating lens (7), and a focusing lens (8); One end of the outer casing (15) is equipped with a gas-generating propellant casing (14) and a gas-generating propellant (13), and the other end is equipped with an ignition propellant casing (10) and an ignition propellant (11). The ignition propellant (11) is covered with a ruptured membrane (12). The ignition propellant casing (10) and the array-type laser emission assembly (1) are fixed inside the outer casing (15). The laser semiconductor light-emitting chip array board (4) is arrayed with laser semiconductor light-emitting chips (16); The laser semiconductor light-emitting chip (16) includes 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) arranged in an array on a laser semiconductor light-emitting chip array plate (4); the second laser semiconductor light-emitting chip (16-2) is located at the center of the laser semiconductor light-emitting chip array plate (4); The ignition charge casing (10) contains a first ignition charge (11-1), a second ignition charge (11-2), a third ignition charge (11-3), a fourth ignition charge (11-4), and a fifth ignition charge (11-5), with the second ignition charge (11-2) located at the center of the ignition charge casing; The gas-producing drug casing (14) contains a first gas-producing drug (13-1), a second gas-producing drug (13-2), a third gas-producing drug (13-3), a fourth gas-producing drug (13-4), and a fifth gas-producing drug (13-5), with the second gas-producing drug (13-2) located at the center of the gas-producing drug casing; The laser semiconductor light-emitting chip (16) is a vertical cavity surface-emitting laser chip; The method includes the following steps: (1) When a car collision occurs, the collision sensor transmits the detected 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 preset 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 impact. When the collision sensor detects an acceleration increment > 10g and the duration is between 10 and 50ms, the central control unit sends a driving current to the laser semiconductor light-emitting chip array of all array-type laser ignition systems in the car's internal airbag. All the 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 focal point of the focused laser beam ignites all the ignition propellants and generates a flame. The flame impacts the rupture membrane (12) and transfers heat to the gas-generating propellant (13). All the gas-generating propellants are heated at the same time and 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 vehicle travel, the vehicle is in an active impact. When the collision sensor detects that the acceleration increment reaches 2g to 6g and the infrared receiver senses a living body, the central control unit sends a driving current to the array of laser semiconductor light-emitting chips in the array-type laser ignition system in the external arc-shaped airbag of the car in sequence with a delay of 1ms to 3ms. During the time of the car impact, the driving current flows into the airbag from the positive electrode shell (2) and out from the negative electrode shell (3) through the laser semiconductor light-emitting chip (16) on the laser semiconductor light-emitting chip array plate (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. Chip (16-3), fourth laser semiconductor light-emitting chip (16-4), and fifth laser semiconductor light-emitting chip (16-5) emit lasers in sequence. The lasers are focused by collimating lens (7) and focusing lens (8) to form a focused laser beam. The focal point of the focused laser beam 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) in sequence to produce flames. The flames impact the ruptured membrane (12), causing 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) to be heated in sequence, undergoing a chemical reaction to produce gas, which causes the airbag to deploy and inflate. 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; the characteristic parameters Y preset in the central control unit include a safety threshold, a time threshold, and a speed threshold; The comparison formula is as follows: 。

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