Wearable high-altitude falling protection airbag device

Abstract

This application relates to the field of high-altitude protective clothing technology, specifically disclosing a wearable high-altitude fall protection airbag device, including: a safety suit, an airbag assembly embedded in the safety suit, a gas generator connected to the air circuit of the airbag assembly, a sensor group for collecting human motion data, and a microcontroller electrically connected to the gas generator and the sensor group respectively; the airbag assembly includes multiple double-layer combined airbags, each double-layer combined airbag including an inner airbag and an outer airbag covering the inner airbag; the inner airbag is a sealed airbag, and the outer airbag is a venting airbag equipped with a dynamic pressure relief valve; the device also includes an airbag internal pressure sensor disposed inside the double-layer combined airbag, and the airbag internal pressure sensor is electrically connected to the microcontroller; the present invention proposes an inner and outer double-layer structure and a dynamic pressure relief valve, which improves the overall safety protection effect by connecting the initial deceleration of the dynamic pressure relief of the outer venting airbag with the rigid support at the end of the inner sealed airbag.

Description

Technical Field

[0001] This invention relates to the field of high-altitude protective clothing technology, specifically a wearable high-altitude fall protection airbag device. Background Technology

[0002] With the increasing number of high-altitude operations such as construction, power emergency repair, and bridge maintenance, falls from height have become the primary special injury threatening the lives of workers. Currently, the industry mainly uses passive protective equipment such as safety belts and fall arrestors, but these devices rely heavily on anchor points and are prone to pendulum effects or secondary injuries to the spine during falls.

[0003] In recent years, wearable airbags have been introduced into the field of high-altitude operations as an active protection technology. Existing fall protection airbags typically use a single-layer airbag structure, relying on a single accelerometer or gyroscope to detect the fall and trigger the inflation of a high-pressure gas cylinder. However, in practical applications, especially in fall scenarios of 5-30 meters or more, existing technologies suffer from the following insurmountable technical defects: 1. Existing technology using fully enclosed airbags can reduce the velocity at the end of the fall to zero, but at the moment of impact, the pressure inside the airbag rises sharply, generating a thrust (overload) that far exceeds the human body's tolerance limit, causing the human body to experience multiple dangerous bouncing collisions. If a normally open vent type depressurization airbag is used, although it avoids the human body being cushioned from overload, it often punctures at the end of the fall due to the gas being released (i.e., the airbag collapses completely), failing to effectively reduce the velocity at the end of the fall to zero, and still causing the human body to have a hard collision with the ground.

[0004] 2. The working environment at height is complex. The running and jumping of workers, the vibration of throwing heavy objects, and even the downwash airflow of helicopter rotors and sudden changes in air pressure in elevator shafts can seriously interfere with the existing single acceleration or simple air pressure threshold judgment algorithm, resulting in an extremely high false trigger rate and seriously affecting normal construction operations.

[0005] 3. Most existing inflation triggers are open-loop controls, meaning that the main control board does not intervene after issuing the ignition command. In extreme cases such as igniter aging and failure, gas cylinder leakage, or insufficient gas expansion rate in low-temperature environments, the airbag will not be able to reach the effective working pressure before hitting the ground, resulting in fatal protective failure. Summary of the Invention

[0006] This application provides a wearable fall protection airbag device, the main purpose of which is to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this application provides a wearable high-altitude fall protection airbag device, including: a safety suit, an airbag assembly embedded in the safety suit, a gas generator connected to the air circuit of the airbag assembly, a sensor group for collecting human motion state data, and a microcontroller electrically connected to the gas generator and the sensor group respectively. The airbag assembly includes multiple double-layer combined airbags, each comprising an inner airbag and an outer airbag covering the inner airbag; the inner airbag is a sealed airbag, and the outer airbag is a venting airbag equipped with a dynamic pressure relief valve; both the outer airbag and the inner airbag are connected to the gas generator's air passage. The device also includes an airbag internal pressure sensor disposed inside the double-layer combined airbag, and the airbag internal pressure sensor is electrically connected to the microcontroller; The microcontroller is configured to: receive motion state data sent by the sensor group; when the motion state data meets a preset fall trigger condition, send an initial inflation command to the gas generator; and after sending the initial inflation command, receive pressure data sent by the airbag internal pressure sensor; if the pressure data does not reach a preset pressure threshold within a preset time window, send a secondary inflation command to the gas generator.

[0008] In one feasible implementation, the ratio of the deployed thickness of the inner airbag to the deployed thickness of the outer airbag is 1 / 3.

[0009] In one feasible implementation, the dynamic pressure relief valve has a preset limit pressure threshold; the dynamic pressure relief valve is configured such that: when the pressure inside the outer airbag is less than the limit pressure threshold, the dynamic pressure relief valve remains closed; when the pressure inside the outer airbag reaches the limit pressure threshold, the dynamic pressure relief valve automatically opens to release pressure, and the exhaust opening area of ​​the dynamic pressure relief valve increases with the increase of the pressure inside the outer airbag.

[0010] In one feasible implementation, the sensor group includes a triaxial accelerometer and a barometer; the preset fall trigger condition includes simultaneously satisfying a first condition and a second condition: the first condition is that the resultant acceleration value detected by the triaxial accelerometer is less than or equal to 0.5 m / s², and the duration of the acceleration value being less than or equal to 0.5 m / s² exceeds 0.5 s; the second condition is that the altitude drop value detected by the barometer is greater than or equal to 1.125 m within a 0.5 s time interval.

[0011] In one feasible implementation, the preset time window is 0.2s, and the preset pressure threshold is 0.05MPa; the microcontroller is specifically configured to: after issuing the first inflation command 0.2s, if the pressure data fed back by the airbag internal pressure sensor is less than 0.05MPa, immediately send the second inflation command.

[0012] In one feasible implementation, the plurality of double-layer combined airbags are respectively disposed at the head, neck, chest, abdomen and back of the human body corresponding to the safety suit, and the double-layer combined airbags at each location are interconnected through airways.

[0013] In one feasible implementation, the device further includes a satellite positioning module electrically connected to the microcontroller. The satellite positioning module is used to acquire current working altitude data and send it to the microcontroller. The microcontroller combines the working altitude data and the motion state data to determine the fall trigger condition.

[0014] This application provides a wearable fall protection airbag device. The invention proposes a combination of an inner and outer double-layer structure and a dynamic pressure relief valve. By connecting the initial deceleration of the outer airbag's dynamic pressure relief with the rigid support of the inner airbag's end, the physical contradiction between overload protection and deceleration to zero during high-altitude buffering is resolved, extending the effective protection height to over 30 meters. Furthermore, the exhaust opening area of ​​the outer airbag dynamically increases with increasing internal pressure, ensuring that the airbag's thrust against the human body remains within a safe critical value, achieving saturation protection and overload-free soft landing under all operating conditions. Simultaneously, this device is based on a dual stringent determination of acceleration and pressure difference at altitude, and incorporates satellite... The satellite positioning module acquires absolute altitude and performs multi-dimensional data fusion, greatly improving anti-interference capabilities in complex environments and minimizing false triggering. At the trigger execution end, if the system detects that the airbag has not reached the safe working pressure of 0.05 MPa within an extremely short time window of 0.2 seconds after the initial inflation, it will seamlessly trigger a second inflation command, providing a highly reliable failure-proof mechanism for life safety. Furthermore, airbags throughout the body are connected by a high-pressure resistant flexible pipe, which automatically balances the force on each part of the body using fluid dynamics when the body is impacted, effectively preventing unilateral localized airbag rupture due to instantaneous overpressure, further enhancing the overall safety protection effect of the device. Attached Figure Description

[0015] Figure 1 This illustration shows a schematic diagram of the wearable fall protection airbag device provided in this application embodiment in an inflated state; Figure 2 This illustration shows a schematic diagram of the wearable fall protection airbag device provided in this application embodiment in the inflated and open state; Figure 3 This paper illustrates a schematic diagram of the working process of the wearable high-altitude fall protection airbag device provided in an embodiment of this application. Figure 4 A schematic diagram illustrating the working process of the dynamic pressure relief valve provided in an embodiment of this application is shown. Detailed Implementation

[0016] To better understand the technical solutions provided in the embodiments of this specification, the technical solutions of the embodiments of this specification will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this specification and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. In the absence of conflict, the embodiments of this specification and the technical features in the embodiments can be combined with each other.

[0017] In this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between these entities or operations; moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus; without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element; the term "two or more" includes two or more cases.

[0018] Please see Figures 1 to 4As shown, this application provides a wearable fall protection airbag device, including: a safety suit, an airbag assembly embedded in the safety suit, a gas generator connected to the air path of the airbag assembly, a sensor group for collecting human motion data, and a microcontroller electrically connected to the gas generator and the sensor group respectively; the airbag assembly includes multiple double-layer combined airbags, each double-layer combined airbag including an inner airbag and an outer airbag covering the inner airbag; the inner airbag is a sealed airbag, and the outer airbag is a venting airbag equipped with a dynamic pressure relief valve; the outer airbag and the inner airbag... Each layer of airbag is connected to the gas generator's air path; the device also includes an airbag internal pressure sensor installed inside the double-layer combined airbag, which is electrically connected to a microcontroller; the microcontroller is configured to: receive motion state data sent by the sensor group, and when the motion state data meets the preset fall triggering conditions, send an initial inflation command to the gas generator; and after sending the initial inflation command, receive pressure data sent by the airbag internal pressure sensor, and if the pressure data does not reach the preset pressure threshold within a preset time window, send a secondary inflation command to the gas generator.

[0019] In this embodiment, a wearable fall protection airbag device is provided, mainly used in high-altitude operation scenarios such as construction and power emergency repair, to achieve intelligent triggering and effective cushioning when personnel fall. The airbag device in this embodiment is based on a safety suit. This safety suit is made of high-strength, wear-resistant, and elastic flame-retardant nylon or Kevlar blend fabric to ensure that the safety suit itself will not tear when the airbag inflates instantly. The airbag assembly is tightly embedded in the internal layers of the safety suit. To ensure weight balance and proper piping... To minimize the impact of the gas generator (e.g., an automotive-grade dual-stage cooled gas generator with a built-in high-pressure argon / helium mixture) and microcontroller (MCU, e.g., a high-frequency industrial-grade chip based on the ARM Cortex-M4 architecture) are typically integrated into a high-strength carbon fiber hard-shell backpack and fixed to the back waist of the safety suit. The sensor array (including high-precision accelerometers and barometers) is integrated on the same motherboard as the microcontroller or distributed in the shoulder and waist areas of the safety suit and electrically connected to the microcontroller via I2C or SPI bus.

[0020] In this embodiment, the airbag assembly is not a single air chamber, but rather composed of multiple double-layer combined airbags spliced ​​or connected together. Specifically, each double-layer combined airbag includes an inner airbag and an outer airbag covering the inner airbag. The inner airbag is made of highly airtight coated silicone nylon cloth, heat-fused together, with no vents on its surface, forming a completely sealed cavity. Its main function is to provide rigid support in the final stage of human contact with the ground, preventing a hard landing. The outer airbag is wrapped in a wear-resistant and puncture-resistant fabric. In addition to the airbag, the outer airbag is equipped with a dynamic pressure relief valve (e.g., a mechanical pressure relief valve with a specific preload spring); the gas generator's outlet is connected to both the outer and inner airbags via a high-pressure resistant flexible silicone gas guide tube; in actual engineering reproduction, a coaxial double tube or a diverter valve can be used; when the gas generator ignites and releases high-pressure gas, the gas is simultaneously filled into the inner and outer airbags according to a preset ratio (controlled by the cross-sectional area of ​​the gas guide tube), causing the inner and outer airbags to expand and unfold synchronously in a very short time.

[0021] To ensure that the airbag can deploy reliably in the critical moment of a fall, this device is equipped with an airbag internal pressure sensor (such as a piezoresistive micro-film pressure sensor with a range of 0~0.5MPa) inside the airbag. The sensor probe is fixed to the main airway or the inner wall of the inner airbag of the double-layer combined airbag, and its signal output terminal is electrically connected to the ADC pin of the microcontroller through a flexible ribbon cable.

[0022] The specific steps of the microcontroller workflow are as follows: S10: The microcontroller receives human motion state data (such as triaxial acceleration data and barometric altitude data) sent by the sensor group in real time at a sampling rate of no less than 100Hz.

[0023] S20: The microcontroller runs a Kalman filter algorithm to reduce noise in the data; when the microcontroller determines that the motion state data meets the preset fall trigger conditions (i.e., the system recognizes that the human body is in a state of weightlessness and rapid descent), the program enters the trigger program.

[0024] S30: The microcontroller immediately outputs a high-level pulse (e.g., 12V, lasting 50ms) through its GPIO pin to send the first inflation command to the main igniter of the gas generator; the main stage of the gas generator explodes, and high-pressure gas instantly fills the double-layer combined airbag.

[0025] S40: After sending the first inflation command, the microcontroller immediately starts an internal high-precision timer (forming a preset time window, usually set to 0.15s~0.2s); within this time window, the microcontroller reads the pressure data sent by the airbag internal pressure sensor at high frequency.

[0026] Normal situation: If the pressure data reaches the preset pressure threshold (i.e., the airbag has inflated normally and has protective capabilities) before the end of the time window, the microcontroller determines that the inflation is successful and no further intervention is required.

[0027] Abnormal gas replenishment (secondary inflation): If the pressure data still does not reach the preset pressure threshold by the end of the time window (indicating that the main igniter may have failed, the gas cylinder may be leaking, or the gas expansion rate may be insufficient due to extreme low temperature), the microcontroller will immediately send a secondary inflation command to the backup igniter (or backup auxiliary gas cylinder) of the gas generator through another GPIO pin to perform forced inflation and ensure that the airbag reaches the working pressure before the human body lands.

[0028] In some examples, the ratio of the inner airbag's deployment thickness to the outer airbag's deployment thickness is even further, being 1 / 3.

[0029] This example employs an asymmetrical thickness design to achieve two-stage buffering and energy absorption. During a fall, the outer airbag, which accounts for 3 / 4 of the total thickness, provides a sufficiently long compression stroke. When the body hits the ground, the thick outer airbag first undergoes large-scale deformation and, in conjunction with the pressure relief valve, releases air, undertaking the task of initial deceleration and overload resistance, significantly reducing the fall velocity of the body's end (e.g., 20 m / s) to a safe range (e.g., 10 m / s). Subsequently, the thinner but completely sealed inner airbag begins to bear force. Due to its small size and lack of pressure relief, the internal pressure rises sharply after being compressed, exhibiting the physical characteristics of rigid support, responsible for end-stage deceleration, and smoothly absorbing the remaining kinetic energy to zero, thereby preventing the body from experiencing a hard impact upon hitting the ground.

[0030] In some examples, the dynamic pressure relief valve further has a preset limit pressure threshold; the dynamic pressure relief valve is configured such that when the pressure inside the outer airbag is less than the limit pressure threshold, the dynamic pressure relief valve remains closed; when the pressure inside the outer airbag reaches the limit pressure threshold, the dynamic pressure relief valve automatically opens to release pressure, and the exhaust opening area of ​​the dynamic pressure relief valve increases as the pressure inside the outer airbag increases.

[0031] In this example, the dynamic pressure relief valve configured in the outer airbag is not a simple rupture prevention vent, but a mechanically adaptive valve with a variable cross-section. This dynamic pressure relief valve can adopt a spring-piston structure, mainly including a valve body, a conical valve core set in the valve body, a pre-tension spring that presses the valve core against the exhaust port, and a guide rod. The elastic force of the pre-tension spring is calibrated according to the safe stress limit of the human chest cavity and spine (i.e., the ultimate pressure threshold Pmax). When the internal pressure of the outer airbag is less than Pmax, the spring thrust is greater than the air pressure thrust, and the valve remains absolutely closed to ensure rapid initial inflation. When the airbag touches the ground and is compressed, and the internal pressure instantly reaches or exceeds Pmax, the high-pressure gas overcomes the spring pre-tension force and pushes open the conical valve core, starting to depressurize and prevent impact.

[0032] The mechanical adaptive valve preferably adopts a conical valve core or a sliding column design with an involute opening. When the internal instantaneous impact pressure is greater, the valve core is pushed open for a longer displacement, and the exposed exhaust channel cross-sectional area is larger. It has a linear or nonlinear dynamic exhaust mechanism, which can ensure that the outer airbag always maintains a constant anti-overload thrust under various complex terrains and different weight drop conditions.

[0033] In some examples, the sensor array further includes a triaxial accelerometer and a barometer; the preset fall trigger conditions include simultaneously satisfying a first condition and a second condition: the first condition is that the resultant acceleration value detected by the triaxial accelerometer is less than or equal to 0.5 m / s², and the duration of the acceleration value being less than or equal to 0.5 m / s² exceeds 0.5 s; the second condition is that the altitude drop value detected by the barometer is greater than or equal to 1.125 m within a 0.5 s time interval.

[0034] This example defines in detail the threshold of the anti-false triggering algorithm running within the microcontroller; in high-altitude work environments, there are many routine actions such as jumping, walking briskly, and bending over, which must be strictly filtered through dual conditions.

[0035] First conditional acceleration: Using a high-precision triaxial accelerometer, the human body will be close to weightlessness in free fall; setting it to less than or equal to 0.5m / s² and for a duration of more than 0.5s can effectively filter out the instantaneous weightlessness signal caused by small jumps or equipment vibrations in daily work.

[0036] The second condition (barometric altitude difference): A high-precision MEMS barometer is used; since the theoretical fall distance of a free fall in 0.5 seconds is; considering the wind resistance coefficient of the human body clothing, this embodiment sets the threshold to a height drop of greater than or equal to 1.225m within a 0.5s time interval; the MCU will only output a trigger command when the acceleration and height change are simultaneously satisfied within the time window, thus minimizing the false trigger rate.

[0037] In some examples, the preset time window is 0.2s and the preset pressure threshold is 0.05MPa. The microcontroller is specifically configured to send a second inflation command immediately if the pressure data fed back by the airbag internal pressure sensor is less than 0.05MPa 0.2s after the first inflation command is issued.

[0038] In this example, the specific timing parameters of the failure prevention mechanism are defined; the preset time window set by the system is 0.2s; assuming a fall from a height of 20m to the ground, the total time is about 2.0s, and 0.2s only accounts for one-tenth of the total fall time, leaving sufficient time for secondary rescue; the preset pressure threshold is set to 0.05MPa; it is the minimum air pressure limit to maintain the basic shape of the double-layer combined airbag and provide effective cushioning.

[0039] The execution sequence is as follows: The hardware timer inside the microcontroller starts the instant the first inflation command is issued; when the 0.2s interrupt occurs, the current ADC conversion value of the airbag internal pressure sensor is immediately read; if the converted pressure is lower than 0.05MPa, the microcontroller triggers the standby pin of the independent power management without delay, detonating the second-stage gas-generating agent of the gas generator (or opening the standby gas storage cylinder) to achieve forced saturation gas replenishment.

[0040] In some examples, multiple double-layered airbags are further positioned on the head, neck, chest, abdomen, and back of the person corresponding to the safety suit, and the double-layered airbags at each position are interconnected through airways.

[0041] In this example, the distribution and connection of the airbag components on the safety suit were optimized. Multiple double-layer combined airbags were sewn or anchored to the head (in a U-shape around the back of the head and cervical spine), chest, abdomen, and back of the safety suit according to ergonomics. The double-layer combined airbags in each part are not inflated independently, but are interconnected through high-pressure resistant TPU (thermoplastic polyurethane elastomer) flexible tubes. This air-through design has two technical advantages: First, only a single (or dual-stage) gas generator is needed to complete the deployment of the whole body airbags, reducing the dead weight of the hardware; Second, when a part of the body (such as the back) touches the ground and is compressed first, the local gas can quickly flow to the chest and head airbags through the connecting air channels, using fluid mechanics to achieve dynamic self-balancing of pressure and avoid local airbags from rupturing due to instantaneous overpressure.

[0042] In some examples, the device further includes a satellite positioning module electrically connected to the microcontroller. The satellite positioning module is used to acquire current working altitude data and send it to the microcontroller. The microcontroller combines the working altitude data and motion state data to determine the fall trigger conditions.

[0043] In this example, a satellite positioning module (such as a BeiDou / GPS dual-mode receiver) is further set up as the basis for environmental calibration. Relying solely on a barometer to determine altitude is risky. In windy weather, underdrafts from helicopter rotors, or when workers enter pressurized / negative pressure elevator shafts, local air pressure can change drastically, causing a sharp drop in the altitude measured by the barometer and resulting in serious errors. When the microcontroller is powered on and initialized, it obtains the current three-dimensional coordinates and absolute altitude through the satellite positioning module as reference data. During operation, the microcontroller not only compares relative air pressure changes, but also periodically performs low-frequency calibration of altitude data (e.g., 1Hz) through satellite signals. Combined with high-frequency dynamic data (e.g., 100Hz) from the triaxial accelerometer, multi-sensor fusion (such as the Kalman filter algorithm) is used to eliminate air pressure drift interference, ensuring more reliable trigger judgment.

[0044] The above are merely embodiments of this application and are not intended to limit this application; various modifications and variations can be made to this application by those skilled in the art; any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

Claims

1. A wearable fall protection airbag device, comprising: Safety suit, an airbag assembly embedded in the safety suit, a gas generator connected to the airbag assembly via an air path, a sensor group for collecting human motion data, and a microcontroller electrically connected to the gas generator and the sensor group respectively; characterized in that: The airbag assembly includes multiple double-layer combined airbags, each comprising an inner airbag and an outer airbag covering the inner airbag; the inner airbag is a sealed airbag, and the outer airbag is a venting airbag equipped with a dynamic pressure relief valve; both the outer airbag and the inner airbag are connected to the gas generator's air passage. The device also includes an airbag internal pressure sensor disposed inside the double-layer combined airbag, and the airbag internal pressure sensor is electrically connected to the microcontroller; The microcontroller is configured to: receive motion state data sent by the sensor group; when the motion state data meets a preset fall trigger condition, send an initial inflation command to the gas generator; and after sending the initial inflation command, receive pressure data sent by the airbag internal pressure sensor; if the pressure data does not reach a preset pressure threshold within a preset time window, send a secondary inflation command to the gas generator.

2. The wearable fall protection airbag device according to claim 1, characterized in that, The ratio of the deployed thickness of the inner airbag to the deployed thickness of the outer airbag is 1 / 3.

3. The wearable fall protection airbag device according to claim 2, characterized in that, The dynamic pressure relief valve has a preset limit pressure threshold; The dynamic pressure relief valve is configured such that: when the pressure inside the outer airbag is less than the ultimate pressure threshold, the dynamic pressure relief valve remains closed; when the pressure inside the outer airbag reaches the ultimate pressure threshold, the dynamic pressure relief valve automatically opens to release pressure, and the exhaust opening area of ​​the dynamic pressure relief valve increases with the increase of the pressure inside the outer airbag.

4. The wearable fall protection airbag device according to claim 1, characterized in that, The sensor group includes a triaxial accelerometer and a barometer; the preset fall trigger conditions include simultaneously satisfying a first condition and a second condition: The first condition is that the resultant acceleration value detected by the triaxial accelerometer is less than or equal to 0.5 m / s², and the duration of the acceleration value being less than or equal to 0.5 m / s² exceeds 0.5 s; The second condition is that the altitude drop value monitored by the barometer is greater than or equal to 1.125m within a 0.5s time interval.

5. The wearable fall protection airbag device according to claim 1, characterized in that, The preset time window is 0.2s, and the preset pressure threshold is 0.05MPa. The microcontroller is specifically configured to: after issuing the first inflation command 0.2s, if the pressure data fed back by the airbag internal pressure sensor is less than 0.05MPa, immediately send the second inflation command.

6. The wearable fall protection airbag device according to claim 1, characterized in that, The multiple double-layer combined airbags are respectively disposed at the head, neck, chest, abdomen and back of the human body corresponding to the safety suit, and the double-layer combined airbags at each location are interconnected through airways.

7. The wearable fall protection airbag device according to claim 1, characterized in that, The device also includes a satellite positioning module electrically connected to the microcontroller. The satellite positioning module is used to acquire current working altitude data and send it to the microcontroller. The microcontroller combines the working altitude data and the motion state data to determine the fall trigger condition.

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