Aircraft passenger ladder anti-settlement sound-light alarm method and system based on closed loop triggering

Abstract

The invention belongs to the technical field of passenger ladder settlement prevention, and particularly relates to an aircraft passenger ladder settlement prevention sound-light alarm method and system based on closed loop triggering. A safety boot is arranged between the passenger ladder and the airplane cabin door, a first electrode and a second electrode are arranged in the safety boot, and the first electrode and the second electrode are in contact due to airplane settlement to form a closed detection loop through a wire and a detection unit; the detection unit injects constant current into the loop at a period less than or equal to 50ms and measures resistance, and real-time settlement delta h is converted by combining the calibration curve; when the real-time settlement amount delta h or the resistance exceeds a set threshold value, a settlement judgment signal is generated, an acousto-optic device is driven to give an alarm in a grading mode, and a parking or supporting compensation instruction is sent to a passenger ladder control system; and after the settlement is relieved, the resistor returns to normal and is kept for a preset duration, the system automatically resets. According to the method, the structure is simple, the environmental interference resistance is high, millimeter-level settlement monitoring and active compensation can be achieved, and the safety and reliability of docking operation of the passenger ladder and the airplane are remarkably improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of passenger elevator car anti-sinking, and particularly relates to an airplane passenger elevator car anti-sinking sound-light alarm method and system based on closed loop triggering. BACKGROUND

[0002] The airplane passenger elevator car is an important bridge connecting passengers and passenger cabins in aviation ground service equipment, and its safety and stability directly affects boarding efficiency and operation guarantee level. With the increase of the change range of the bridge load center of large wide-body aircraft, the support foot anti-sinking monitoring has gradually evolved from the "experience cushioning - manual observation" to the "mechanical limit switch - oil cylinder pressure sensor - laser displacement measurement" and other multi-path coexistence technical stages. The foregoing method can perceive the state of the support foot under certain conditions, but is affected by mud, rain, snow, magnetic field and structure vibration, resulting in a decrease in reliability, or has high maintenance costs due to complex sensor wiring and tedious calibration; especially in high-cold, high-humidity and large day-night temperature difference airport environments, the traditional mechanical / optical limit often appears false triggering or missed reporting, and it is difficult to capture the trend of slight sinking in time. In addition, the current alarm logic is triggered by a single threshold or a single channel, lacks graded early warning and automatic compensation closed loop control, and cannot respond to the "slow sinking and sudden load break" composite scene in time, thereby burying the safety hazards of gangway mispositioning, personnel falling and aircraft scratches. SUMMARY

[0003] This section aims to summarize some aspects of the embodiments of the application and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of the specification to avoid obscuring the purpose of this section, abstract and title, and such simplifications or omissions cannot be used to limit the scope of the application.

[0004] In view of the following technical problems in the prior art: the problem of excessive false triggering rate of the existing anti-sinking device.

[0005] To solve the above technical problems, the application provides the following technical solutions: an airplane passenger elevator car anti-sinking sound-light alarm method based on closed loop triggering, comprising,

[0006] S1, a safety shoe is arranged between the passenger elevator car and the airplane cabin door, a first electrode and a second electrode are arranged in the safety shoe, the airplane sinking causes the first electrode to contact the second electrode, a closed detection loop is formed through a wire and a detection unit;

[0007] S2, the detection unit injects a detection current into the closed detection loop at a sampling period less than or equal to 50 ms and collects a loop resistance value in real time, determines the contact state of the first electrode and the second electrode based on the loop resistance value and calculates a real-time sinking amount Ah;

[0008] S3, generating a settlement determination signal when the real-time settlement amount Δh is greater than or equal to a first threshold value or the loop resistance value R is less than or equal to a second threshold value;

[0009] S4, determining that the settlement signal generation control acousto-optic alarm device issues a first level early warning; if the settlement determination signal lasts more than a preset duration T and the real-time settlement amount Δh continues to increase, a second level danger alarm is issued and a stop / support compensation instruction is sent to the passenger elevator car control system;

[0010] S5, when the settlement is removed and the loop resistance value R returns to the normal range and remains for a time t0, the acousto-optic alarm device is automatically reset and the settlement determination signal is cleared.

[0011] As a preferred technical scheme of the aircraft passenger elevator car anti-settlement acousto-optic alarm method based on closed loop triggering, the detection unit adopts a Wheatstone bridge structure, uses a differential measurement method to measure the closed detection loop resistance with high precision, and eliminates the influence of environmental temperature on the loop resistance through a temperature compensation circuit.

[0012] As a preferred technical scheme of the aircraft passenger elevator car anti-settlement acousto-optic alarm method based on closed loop triggering, the real-time settlement amount Δh is calculated by the relationship Δh=k·ΔR between the loop resistance change amount ΔR and the calibration coefficient k.

[0013] As a preferred technical scheme of the aircraft passenger elevator car anti-settlement acousto-optic alarm method based on closed loop triggering, the detection unit simultaneously collects the support foot oil cylinder pressure P, and only confirms the settlement determination signal when the real-time settlement amount Δh is greater than or equal to a first threshold value and the support foot oil cylinder pressure P is less than or equal to a third threshold value, so as to avoid false alarms caused by sudden load changes.

[0014] As a preferred technical scheme of the aircraft passenger elevator car anti-settlement acousto-optic alarm method based on closed loop triggering, at the same time of the second level danger alarm, the system automatically drives the support foot lifting control valve to open the compensation mode, so that the support foot is retracted downward to restore the real-time settlement amount Δh to be less than or equal to the first threshold value.

[0015] As a preferred technical scheme of the aircraft passenger elevator car anti-settlement acousto-optic alarm method based on closed loop triggering, the first threshold value is 5mm-10mm, the second threshold value corresponds to a loop resistance change amount greater than or equal to 30mΩ, the preset duration T is 2s-3s, and the holding time t0 is 10s.

[0016] As a preferred technical scheme of the aircraft passenger elevator car anti-settlement acousto-optic alarm method based on closed loop triggering, after the passenger elevator car is powered on, the continuity and function of the closed detection loop, the acousto-optic alarm device and the data processing module are checked automatically, and after confirming that there is no fault, the monitoring state is entered;

[0017] When the guest car switches to the moving mode, the system forcibly disconnects the first electrode and the second electrode, deletes the Ah historical data and closes the alarm logic, so as to avoid false triggering caused by driving bump.

[0018] The application further discloses a system based on the aforementioned aircraft guest car anti-sink photoelectric alarm method based on a closed loop trigger,

[0019] The safety shoe is provided with a first electrode and a second electrode, and the guest car comprises a car body and a guest elevator connected to the car body through a support foot oil cylinder.

[0020] The detection unit is electrically connected to the closed detection loop and is used for measuring the loop resistance value.

[0021] The data processing module is signal-connected to the detection unit and is used for outputting a sink determination signal.

[0022] The photoelectric alarm device is connected to the data processing module and is used for issuing a pre-warning according to the sink determination signal.

[0023] As a preferred technical scheme of the aircraft guest car anti-sink photoelectric alarm system based on a closed loop trigger, the safety shoe further comprises a bottom plate and a soft cover arranged on the bottom plate, the first electrode is a metal plate connected to the bottom plate through an elastic hinge, the second electrode comprises a spring connected to the bottom plate and a conductive sheet arranged on the top of the spring, and a righting rod is arranged on the side of the conductive sheet.

[0024] As a preferred technical scheme of the aircraft guest car anti-sink photoelectric alarm system based on a closed loop trigger, the photoelectric alarm device comprises a buzzer with a continuous sound pressure of greater than or equal to 90 dB and a 360° rotating LED signal lamp, and the light colors corresponding to the alarm levels are a pre-warning light and a danger light respectively.

[0025] The application has the following beneficial effects: compared with a mechanical limiting or single sensor scheme, the method has higher reliability, lower maintenance cost and more comprehensive safety guarantee ability in a complex airport environment. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 FIG. 1 is a structural schematic diagram of a safety shoe in the system of the application;

[0027] Figure 2 FIG. 2 is a structural schematic diagram of a guest car in the system of the application;

[0028] Figure 3 FIG. 3 is a schematic diagram of module connection in the system of the application;

[0029] Figure 4 FIG. 4 is a schematic diagram of a detection circuit in the application.

[0030] 100, safety shoe; 101, first electrode; 102, second electrode; 103, bottom plate; 102a, spring; 102b, conductive sheet; 102c, centralizer; 200, passenger stair car; 201, car body; 202, passenger stair; 203, support foot oil cylinder; 204, front platform; 400, detection unit; 500, data processing module; 600, audible and visual alarm device; 300, aircraft door. DETAILED DESCRIPTION

[0031] In order to make the above objectives, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0032] In the following description, a large number of specific details are set forth in order to facilitate a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the concept of the present application, therefore the present application is not limited to the specific embodiments disclosed below.

[0033] Secondly, the "one embodiment" or "embodiment" referred to herein means that the specific features, structures or characteristics can be included in at least one implementation of the present application. "In one embodiment" appearing in different places in the specification does not mean the same embodiment, nor is it an embodiment that is separate or alternative to other embodiments.

[0034] Thirdly, the present application is described in detail in conjunction with the schematic diagram, and in the detailed description of the embodiments of the present application, the cross-sectional view of the device structure is partially enlarged without general proportion for the convenience of description, and the schematic diagram is only an example, which should not limit the scope of protection of the present application. In addition, three-dimensional spatial dimensions including length, width and depth should be included in actual manufacture.

[0035] Embodiment 1

[0036] Reference Figures 1-4 The embodiment provides an aircraft passenger stair car anti-settling audible and visual alarm method based on closed loop triggering, comprising,

[0037] S1, a safety shoe is arranged between the passenger stair car and the aircraft door, the safety shoe is provided with a first electrode and a second electrode, the aircraft settlement causes the first electrode to contact the second electrode, a closed detection loop is formed through a lead wire and a detection unit;

[0038] S2, the detection unit injects a detection current into the closed detection loop at a sampling period less than or equal to 50 ms and collects a loop resistance value in real time, determines the contact state of the first electrode and the second electrode based on the loop resistance value and calculates a real-time settlement amount Δh; it needs to be specifically explained that,

[0039] The detection unit adopts a Wheatstone bridge structure, uses a differential measurement method to measure the closed detection loop resistance with high precision, and eliminates the influence of environmental temperature on the loop resistance through a temperature compensation circuit.

[0040] With reference to Figure 4 The core circuit of the detection unit adopts a Wheatstone bridge + constant current source + differential amplifier; specifically, Rx is the resistance value between the first electrode and the second electrode, R1 and R2 are both proportional reference resistances, form a proportional arm to amplify the change of Rx into a significant voltage difference, the resistance R3 is an adjustable resistance with temperature compensation, which maintains the voltage stable, specifically, it can be realized by connecting a negative temperature coefficient thermistor in parallel at both ends of R3, the resistance R4 and the resistance R3 form a reference arm, U is a differential amplifier, which amplifies the resistance change between the first electrode and the second electrode, Vref is a constant current source, and Vout is an output.

[0041] Further, a laser displacement sensor is arranged on the bottom plate 103, which is used to measure the sinking amount of the first electrode and calculate the sinking amount of the machine cabin, and cross-verify with the detection loop measurement result.

[0042] The pressure sensor is installed in the support foot oil cylinder high pressure cavity, and the 4-20mA current loop is led to the analog input of the data processing module through a waterproof M12 connector.

[0043] Step S1 realizes the real-time sensing of the contact integrity of the aircraft cabin door and the front platform by using the "first electrode (aircraft cabin door position) - second electrode (front platform position) - detection unit" to form a turn-on / off characteristic, by setting a movable first electrode under the aircraft cabin door and contacting and pressing the first electrode after the aircraft cabin door sinks.

[0044] Function and use: This structure avoids the defects that the traditional limit switch is easily disturbed by mud, ice and frost, and obtains a self-cleaning, corrosion-resistant and fast-response contact monitoring channel without changing the mechanical design of the safety shoe, which provides a reliable basic closed signal for subsequent settlement calculation and alarm logic.

[0045] Further, the real-time settlement amount Ah is calculated through the relationship between the loop resistance change amount AR and the calibration coefficient k, i.e., Ah=k·AR.

[0046] Specifically, since the first electrode rotates when being pressed down, and the second electrode always remains vertical, the contact point between the second electrode and the first electrode moves to the connection between the first electrode and the bottom plate, so that the resistance Rx formed by the conduction between the first electrode and the second electrode becomes smaller, the real-time value of the loop resistance R is measured through the detection circuit, and further, the displacement amount of the second electrode relative to the first electrode is calculated according to the loop resistance change amount DR, the angle change amount and the pressing distance of the first electrode are calculated according to the displacement amount, that is, the real-time settlement amount Dh is obtained.

[0047] Step S2 realizes sub-second tracking of settlement displacement by injecting a constant micro-current into the closed detection loop within a period of ≤50 ms and synchronously collecting the loop voltage, thereby calculating the loop resistance at high frequency and converting the real-time settlement amount Dh in combination with the calibration curve.

[0048] Action and use: resistance quantification has the characteristics of inertia-free and insensitivity to mechanical vibration, and can continuously capture ground subsidence or support leg retraction of several millimeters during short-term landing of an aircraft; in addition, temperature compensation and sliding filter strategy are adopted to ensure that the measurement value can still maintain mΩ level resolution even in an airport environment of -40℃ to +60℃.

[0049] Beneficial effect: provides high-precision and high-robustness real-time settlement quantification basis for the entire system, so that subsequent threshold determination is both accurate and immune to environmental temperature drift and transient vibration interference.

[0050] S3, generating a settlement determination signal when the real-time settlement amount Dh is greater than or equal to a first threshold value or the loop resistance value R is less than or equal to a second threshold value;

[0051] It should be noted that generating the settlement determination signal also includes monitoring the support leg cylinder pressure P, and the specific condition is

[0052] The detection unit simultaneously collects the support leg cylinder pressure P, and only when the real-time settlement amount Dh is greater than or equal to the first threshold value and the support leg cylinder pressure P is less than or equal to a third threshold value, the settlement determination signal is confirmed, so as to avoid false alarms caused by sudden load changes.

[0053] The accuracy and anti-interference ability of the alarm determination are improved, the false alarm rate is reduced to an acceptable level, and at the same time, it is ensured that there will be no missed alarms in a real dangerous scenario.

[0054] S4, determining the settlement signal generation control to issue a first-level early warning to the sound and light alarm device; if the settlement determination signal lasts for more than a preset duration T and the real-time settlement amount Dh continues to increase, a second-level danger alarm is issued and a stop / support compensation instruction is sent to the passenger car control system.

[0055] The step needs to be explained that the second level of danger alarm, the system automatically drives the support foot lifting control valve to open the compensation mode, makes the support foot retract downward to restore the real-time settlement amount Ah≤ the first threshold value. The first threshold value is 5mm~10mm, the second threshold value is corresponding to the loop resistance change amount≥30mΩ, the preset duration T is 2s~3s, and the holding time t0 is 10s.

[0056] Step S4 realizes the "sensing-alarming-intervention" trinity active safety closed loop by driving the sound and light alarm device in stages after detecting the settlement determination signal, and issuing a stop or support compensation instruction to the passenger car control system at the second level of alarm.

[0057] Action and use: the hierarchical sound and light prompt enables the apron operator to take manual review or pad measures at an early stage; if the settlement continues to deteriorate, the system automatically suspends the passenger car lifting or lowers the support compensation, preventing the gangway steps from being misaligned with the passenger cabin door.

[0058] Beneficial effect: significantly reduces the risk of passenger falling, gangway door jamming and aircraft body scratching caused by sudden change of aircraft boarding gap, and improves the safety of personnel and aircraft structure during passenger car operation.

[0059] The system communicates with the passenger car PLC through CAN-BUS, uploads the settlement determination signal, real-time Ah, loop resistance value and alarm level, realizes remote monitoring and maintenance.

[0060] S5, when the settlement is removed and the loop resistance value R returns to the normal range and maintains for a time t0, the sound and light alarm device is automatically reset and the settlement determination signal is cleared.

[0061] The buzzer (≥90dB) and LED signal lamp (360°LED) are integrated in the top assembly of the vehicle cab;

[0062] The vehicle-mounted PLC feeds back the passenger car driving / parking mode state to the data processing module 500, which is used to automatically disconnect / close the detection loop.

[0063] The logic function of the reset module is located in the data processing module, and the hardware executor is the relay K1 (controls the disconnector between the first electrode and the detection unit);

[0064] When the real-time settlement amount Ah returns to normal and the loop resistance maintains for a time t0, K1 closes the detection loop and re-conducts;

[0065] At the same time, the MCU internal real-time settlement amount Ah ring buffer is emptied and the alarm timer is reset.

[0066] Step S5 realizes the self-recovery of the alarm system and the self-elimination of false alarms by automatically resetting the alarm and clearing the determination signal when the settlement is removed and the loop resistance returns to normal and maintains for a stable period of time.

[0067] The self-resetting logic avoids missing resets caused by human intervention and prevents the system from being in an alarm state for a long time after a short fluctuation, thereby affecting subsequent normal operation.

[0068] Beneficial effects: improved system availability and maintenance convenience, reduced operator intervention frequency, and sustained reliable subsidence monitoring capability of the passenger car in multiple stop-move cycles.

[0069] After the passenger car is powered on, the closed detection loop, the sound-light alarm device, and the data processing module are automatically checked for continuity and function, and after confirming that there is no fault, the monitoring state is entered;

[0070] When the passenger car switches to the moving mode, the system forcibly disconnects the first electrode and the second electrode, i.e., disconnects K1, deletes the Δh historical data, and closes the alarm logic, thereby avoiding false triggering caused by driving bumps.

[0071] After the civil aviation passenger car is docked with the airplane, the airplane may sink due to passenger boarding, refueling, and loading of goods, etc. In this case, if the sinking exceeds a certain value (about 20 cm), the airplane cabin door may press against the docking platform of the passenger car, causing the vehicle to be unable to withdraw and the airplane to be unable to take off, resulting in a safety accident. To solve the above problems, the system is designed to place the safety device between the docking platform of the passenger car and the airplane cabin door after the passenger car is docked with the airplane. Once the airplane sinks and the surface of the anti-subsidence device is contacted, the system will issue an alarm to remind the staff to withdraw the vehicle.

[0072] Embodiment 2

[0073] Reference Figures 1-4 The embodiment also discloses a system of an airplane passenger car anti-subsidence sound-light alarm method based on a closed loop trigger, which comprises a safety shoe 100 and a passenger car 200. The safety shoe 100 is provided with a first electrode 101 and a second electrode 102. The passenger car 200 comprises a car body 201 and a passenger car 202. The passenger car 202 is connected to the car body 201 through a support foot oil cylinder 203. A detection unit 400 is electrically connected to the closed detection loop and is used for measuring the resistance value of the loop. A data processing module 500 is connected to the detection unit signal and is used for outputting a subsidence judgment signal. A sound-light alarm device 600 is connected to the data processing module and is used for issuing a warning according to the subsidence judgment signal.

[0074] The data processing module 500 is also connected to a passenger car control system and a support foot control system, and is used for sending a parking or support compensation instruction to the passenger car control system when a second level danger alarm is triggered;

[0075] A reset module is also integrated, which is used for resetting the sound-light alarm device and clearing the subsidence judgment signal.

[0076] The safety boot 100 further comprises a bottom plate 103 and a soft cover arranged on the bottom plate 103, the first electrode 101 is a metal plate connected with the bottom plate 103 through an elastic hinge, the second electrode 102 comprises a spring 102a connected with the bottom plate 103 and a conductive sheet 102b arranged on the top of the spring 102a, and a righting rod 102c is arranged on the side of the conductive sheet 102b.

[0077] The bottom of the vehicle body 201 is provided with a hydraulic support for stabilizing the passenger elevator vehicle 200, and the passenger elevator 202 is supported and connected through a support foot oil cylinder 203, and the height of the passenger elevator can be controlled by controlling the hydraulic pressure in the support foot oil cylinder.

[0078] The safety boot is arranged between the aircraft cabin door 300 and the front platform 204 of the passenger elevator vehicle 200.

[0079] The righting rod 102c is used to keep the conductive sheet 102b vertical, and during the process of pressing down the first electrode 101, the circuit of the second electrode 102 starts to conduct, and continues to press down, because the second electrode 102 keeps vertical, the basic point of the second electrode 102 starts to change, the bottom edge of the first electrode 101 is connected with the detection circuit through a wire, the conductive sheet 102b is connected with the detection circuit through the spring 102a, and the detection circuit detects the resistance value between the first electrode 101 and the second electrode 102.

[0080] The sound and light alarm device comprises a buzzer with a continuous sound pressure ≥90dB and a 360° rotating LED signal lamp, and the light colors corresponding to the alarm levels are yellow (pre-warning light) and red (dangerous light) respectively.

[0081] It should be appreciated that a large number of implementation decisions can be made during the development of any actual implementation, as in any engineering or design project. Such development efforts can be complex and time-consuming, but would be routine work in design, manufacture, and production for those of ordinary skill having the benefit of this disclosure.

[0082] It should be noted that the above examples are only used to illustrate the technical solutions of the present application but not limit the present application, although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the present application, and all of them should be covered in the scope of the claims of the present application.

Claims

1. A method for preventing the occurrence of a sinkhorn sound and light alarm for an aircraft passenger stair car based on a closed loop trigger, the method comprising: Comprising, ​ S1, a safety shoe is arranged between the passenger elevator car and the aircraft door, the safety shoe is provided with a first electrode and a second electrode, and the first electrode and the second electrode are in contact when the aircraft is landing, thereby forming a closed detection circuit through a wire and a detection unit; S2, the detection unit injects a detection current into the closed detection circuit at a sampling period less than or equal to 50 ms and collects the resistance value of the circuit in real time, determines the contact state of the first electrode and the second electrode based on the resistance value of the circuit, and calculates the real-time settlement amount Δh; S3, when the real-time settlement amount Δh is greater than or equal to a first threshold value or the resistance value R of the circuit is less than or equal to a second threshold value, a settlement determination signal is generated; S4, determine the settlement signal generation control sound and light alarm device to issue the first level early warning; if the settlement determination signal lasts more than a preset duration T and the real-time settlement amount Δh continues to increase, a second level danger alarm is issued and a stop / support compensation instruction is sent to the passenger elevator car control system; S5, when the settlement is removed and the resistance value R of the circuit returns to the normal range and remains for a time t0, the sound and light alarm device is automatically reset and the settlement determination signal is cleared.

2. The method of claim 1, wherein the method is a method of preventing the sinkhole sound and light alarm of the aircraft passenger stair car based on the closed loop trigger. The detection unit adopts a Wheatstone bridge structure, uses a differential measurement method to measure the resistance of the closed detection circuit with high precision, and eliminates the influence of environmental temperature on the resistance of the circuit through a temperature compensation circuit.

3. The closed-loop triggered sound and light alarm method for preventing subsidence of an aircraft passenger elevator according to claim 2, characterized in that: The real-time settlement amount Δh is calculated through the relationship between the resistance change amount ΔR and the calibration coefficient k, i.e. Δh=k·ΔR.

4. The closed-loop triggered sound and light alarm method for preventing subsidence of an aircraft passenger elevator according to claim 3, characterized in that: The detection unit simultaneously collects the support foot oil cylinder pressure P, and only confirms the settlement determination signal when the real-time settlement amount Δh is greater than or equal to the first threshold value and the support foot oil cylinder pressure P is less than or equal to a third threshold value, so as to avoid false alarms caused by sudden load changes.

5. The method of claim 4, wherein the method further comprises: determining if the passenger aircraft is in flight; and if the passenger aircraft is in flight, then activating the anti-droop strobe light. At the same time of the second level danger alarm, the system automatically drives the support foot lifting control valve to open the compensation mode, so that the support foot is retracted downward to restore the real-time settlement amount Δh to be less than or equal to the first threshold value.

6. The method of claim 5, wherein the method further comprises: The first threshold value is 5mm-10mm, the second threshold value corresponds to a resistance change amount greater than or equal to 30mΩ, the preset duration T is 2s-3s, and the holding time t0 is 10s.

7. The method of claim 6, wherein the method further comprises: determining if the passenger aircraft is in flight; and if the passenger aircraft is in flight, then activating the anti-droop strobe light. After the passenger elevator car is powered on, the closed detection circuit, the sound and light alarm device and the data processing module are automatically checked for continuity and function, and after it is confirmed that there is no fault, the monitoring state is entered; When the passenger elevator car switches to the moving mode, the system forcibly disconnects the first electrode and the second electrode, deletes the Δh historical data and closes the alarm logic, so as to avoid false triggering caused by driving bumps.

8. A system for preventing the occurrence of sinkhorn sound and light alarms in an aircraft passenger stair car based on the closed loop triggered method according to any one of claims 1 to 7, characterized in that: Comprising A safety shoe (100) and a passenger elevator car (200), the safety shoe (100) is provided with a first electrode (101) and a second electrode (102), the passenger elevator car (200) includes a car body (201) and a passenger elevator (202), and the passenger elevator (202) is connected to the car body (201) through a support foot oil cylinder (203); A detection unit (400) is electrically connected to the closed detection circuit and is used for measuring the resistance value of the circuit; A data processing module (500) is signal-connected to the detection unit and is used for outputting a settlement determination signal; A sound and light alarm device (600) is connected to the data processing module and is used for issuing a warning according to the settlement determination signal.

9. The system of claim 8, wherein: The safety boot (100) further comprises a bottom plate (103) and a soft cover arranged on the bottom plate (103), the first electrode (101) is a metal plate connected with the bottom plate (103) through an elastic hinge, the second electrode (102) comprises a spring (102a) connected with the bottom plate (103) and a conductive sheet (102b) arranged on the top of the spring (102a), and a centralizer (102c) is arranged on the side of the conductive sheet (102b).

10. The system of claim 8, wherein: The sound-light alarm device (600) comprises a buzzer with a continuous sound pressure of ≥90 dB and a 360° rotating LED signal lamp, and the light colors corresponding to the alarm levels are respectively early warning light and danger light.

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