Fuel cell altitude chamber system and control method

Abstract

This application relates to a fuel cell altitude environment chamber system and control method, belonging to the field of hydrogen fuel cell testing technology. The fuel cell altitude environment chamber system includes an altitude environment chamber, a hydrogen supply unit, and a control system. The hydrogen supply unit includes hydrogen supply equipment and a hydrogen supply pipeline located outside the chamber. The hydrogen supply pipeline is divided into an internal chamber section and an external chamber section, both equipped with gas flow sensors. The control system is connected to the gas flow sensors to acquire the hydrogen flow rates in the internal and external chamber sections respectively. When the absolute value of the difference between the two flows exceeds a preset threshold, a safety response command is output. This application compares the flow rate difference in real time based on the principle of mass conservation, enabling accurate identification and immediate intervention of anomalies in the early stages of hydrogen leakage before concentration accumulation. This overcomes the shortcomings of traditional concentration detection methods that rely on diffusion, resulting in a delayed response. It achieves early warning of leakage risks, significantly improves the intrinsic safety level of hydrogen-related testing, prevents potential hydrogen accumulation hazards, and ensures safe and controllable testing.

Description

Technical Field

[0001] This application relates to the field of hydrogen fuel cell testing technology, and in particular to a fuel cell altitude environment chamber system and control method. Background Technology

[0002] As a highly efficient and clean energy device, hydrogen fuel cells require performance and safety testing in environmental chambers simulating different altitudes and pressures during their research and development and verification phases. Due to the low density, rapid diffusion, and flammability and explosiveness of hydrogen, even a minor leak during hydrogen-related testing in a sealed altitude environmental chamber can lead to a serious safety accident. Therefore, extremely high requirements are placed on the safety monitoring of the testing system.

[0003] In related technologies, existing fuel cell altitude environment chamber systems typically employ passive safety monitoring schemes, primarily relying on hydrogen concentration sensors placed at specific locations within the chamber to detect leakage risks. The control system collects signals from the concentration sensors in real time, and when the detected hydrogen concentration exceeds a safety threshold, it triggers an audible and visual alarm or executes an emergency shutdown command.

[0004] However, this safety monitoring method, which relies primarily on concentration detection, has limitations and is somewhat delayed. On the one hand, it takes a certain amount of physical time for hydrogen to diffuse from the leak point to the sensor installation location, especially when the ventilation and airflow organization inside the cabin is complex, which may create blind spots in the monitoring, preventing the sensors from responding promptly in the early stages of a leak. On the other hand, concentration alarms are reactive, meaning that by the time the system triggers an alarm, hydrogen has already leaked and may have accumulated locally, missing the optimal time for risk intervention. Summary of the Invention

[0005] This application provides a fuel cell altitude environment chamber system and control method to solve the problem of response lag caused by the reliance on hydrogen concentration detection in related technologies.

[0006] In a first aspect, embodiments of this application provide a fuel cell altitude environment cabin system, comprising: Altitude environment chamber, which is used to house the fuel cell under test and provide a simulated altitude environment; The hydrogen supply unit includes a hydrogen supply device located outside the altitude environment chamber and connected to the fuel cell under test via a hydrogen supply pipeline. The hydrogen supply pipeline includes an internal chamber section and an external chamber section that are connected to each other. Both the internal chamber section and the external chamber section are equipped with gas flow sensors. The control system is connected to gas flow sensors on the inner and outer sections of the cabin, respectively, to acquire the hydrogen flow rates through the inner and outer sections, and to output a preset safety response command when the absolute value of the difference between the two is greater than a preset threshold.

[0007] In a first aspect, in some embodiments, the safety response command includes at least one of an alarm signal for triggering an audible and visual alarm, a shutdown signal for controlling the hydrogen supply equipment to stop, and a display signal for displaying an abnormal prompt on the display interface.

[0008] In a first aspect, in some embodiments, the control system includes an environmental chamber control unit for controlling the operation of the altitude environment chamber, and a test bench control unit for controlling the test process of the fuel cell under test. The environmental chamber control unit is communicatively connected to the test bench control unit and configured to exchange safety status information and control commands bidirectionally to achieve safety linkage control. The safety status information includes at least one of hydrogen flow signal, hydrogen concentration signal, fire smoke signal, and hatch status signal; the control commands include at least one of alarm signal, sequential shutdown command, and emergency shutdown command.

[0009] In a first aspect, some embodiments also include a fresh air system for providing fresh air to the altitude environment chamber, and a normal pressure fan for drawing in and expelling air from the altitude environment chamber. The air inlet of the atmospheric pressure fan is connected to the exhaust pipe of the fuel cell system under test, and a hydrogen concentration detection device is installed on the exhaust pipe.

[0010] In some embodiments, the hydrogen supply pipeline is sealed to the body of the altitude environment chamber, and one-way valves are provided on both the inner and outer sections of the chamber; a sealing door is provided on the body of the altitude environment chamber.

[0011] In one aspect, in some embodiments, an altitude fan is used to adjust the absolute pressure inside the altitude environment chamber to simulate an altitude environment. An explosion-proof camera is used to observe the testing status inside the altitude environment chamber. An air conditioning system is used to provide a simulated temperature environment inside the altitude cabin; A smoke alarm system is used to monitor whether dense smoke is generated inside the altitude environment chamber; A fire alarm system is used to monitor whether an open flame is generated inside the altitude environment chamber; A sprinkler system for spraying water in the event of a fire inside the altitude environment chamber; An absolute pressure sensor is used to monitor the absolute pressure inside the altitude environment chamber and convert it into an altitude signal. A relative humidity sensor is used to monitor the humidity inside the altimeter environment chamber; A temperature sensor is used to monitor the temperature inside the altimeter environment chamber.

[0012] In one aspect, in some embodiments, the cabin of the altitude environment chamber is a rectangular shell, and a plurality of hydrogen concentration sensors are provided inside the rectangular shell, which are spaced apart along the two diagonals of the top. The hydrogen concentration sensor includes multiple pump-type hydrogen concentration sensors and multiple diffusion-type hydrogen concentration sensors arranged alternately.

[0013] Secondly, embodiments of this application provide a control method for a fuel cell altitude environment chamber system. Based on the fuel cell altitude environment chamber system described in any of the above claims, the method includes: The altitude environment chamber provides a simulated altitude environment, and hydrogen is supplied to the fuel cell under test through a hydrogen supply pipeline via a hydrogen supply equipment. The flow rate of hydrogen gas flowing through the internal section is detected by a gas flow sensor on the internal section, and the flow rate of hydrogen gas flowing through the external section is detected by a gas flow sensor on the external section. The control system calculates the absolute value of the difference between the hydrogen flow rate inside the cabin and the hydrogen flow rate outside the cabin, and outputs a preset safety response command when the absolute value is greater than a preset threshold. The safety response command includes at least one of the following: an alarm signal for triggering an audible and visual alarm, a shutdown signal for controlling the hydrogen supply equipment to stop, and a display signal for displaying an abnormal prompt on the display interface.

[0014] Secondly, in some embodiments, the method further includes: The system acquires the preset hydrogen flow rate setting value in real time, and adjusts the fan speed of the fresh air system and the speed of the atmospheric pressure fan synchronously when the hydrogen flow rate setting value changes. The fan speed of the fresh air system is determined by the fresh air intake flow rate calculated based on the hydrogen flow rate setting and the preset dilution ratio. The speed of the atmospheric pressure fan is determined by adding a preset speed difference to the fan speed of the fresh air system, so as to maintain the negative pressure environment in the altitude environment chamber.

[0015] Secondly, in some embodiments, the method further includes: The load power of the fuel cell under test is acquired in real time. When the load power changes, the cooling power of the air conditioning system and the fan speed of the fresh air system are adjusted synchronously. The change in cooling power of the air conditioning system is determined by multiplying the load power change by a preset proportional coefficient, and the fan speed of the fresh air system is determined by mapping the load power change to a preset speed.

[0016] Secondly, in some embodiments, the method further includes: The hydrogen concentration in the tailpipe is acquired in real time. When the hydrogen concentration in the tailpipe changes, the speed of the atmospheric pressure fan is adjusted synchronously to keep the hydrogen concentration in the tailpipe within a safe range. The rotational speed of the atmospheric pressure fan is positively correlated with the concentration of hydrogen in the exhaust gas, and the rotational speed of the fresh air system fan is adjusted in conjunction with the rotational speed of the atmospheric pressure fan.

[0017] Secondly, in some embodiments, the method further includes: When at least two of the three states of hydrogen flow rate setpoint change, load power change, and tail exhaust hydrogen concentration change occur simultaneously, the fresh air system fan speed and atmospheric pressure fan speed corresponding to each state are obtained respectively, and the larger value is selected as the final control speed. The preset dilution factor, preset proportional coefficient, preset speed difference, and preset speed mapping relationship are all reference values. Accurate values ​​are obtained through preliminary calibration experiments before actual operation and stored in the control system.

[0018] Secondly, in some embodiments, the method further includes: When dense smoke is detected inside the altitude environment chamber, the tested fuel cell is shut down immediately, and the fresh air system and atmospheric pressure fan are both operated at their rated maximum air volume. When an open flame is detected inside the altitude environment chamber, the tested fuel cell is shut down immediately, the fresh air system is stopped, and the sprinkler system is activated. If the sealed door of the altitude environment chamber is found to be not closed or the seal is ineffective, the test operation of the fuel cell under test shall be prohibited or the fuel cell under test shall be shut down sequentially.

[0019] Secondly, in some embodiments, the method further includes: Real-time acquisition of hydrogen concentration sensor readings inside the altitude environment chamber; If the detected value reaches the first preset threshold, the control system is controlled to output an alarm signal. If the detected value reaches the second preset threshold, the control system will output a sequential shutdown command. If the detected value reaches the third preset threshold, the control system will output an emergency stop command and control the fresh air system and the normal pressure fan to operate at the rated maximum air volume. The first preset threshold, the second preset threshold, and the third preset threshold increase sequentially.

[0020] The beneficial effects of the technical solution provided in this application include: This application provides a fuel cell altitude environment chamber system and control method. The altitude environment chamber is used to house the fuel cell under test and provide a simulated altitude environment. The hydrogen supply unit includes a hydrogen supply device located outside the altitude environment chamber and connected to the fuel cell under test via a hydrogen supply pipeline. The hydrogen supply pipeline includes an internal chamber section and an external chamber section that are interconnected. Gas flow sensors are provided on both the internal chamber section and the external chamber section. The control system is connected to the gas flow sensors on the internal chamber section and the external chamber section respectively, and is used to obtain the hydrogen flow rate flowing through the internal chamber section and the external chamber section respectively, and output a preset safety response command when the absolute value of the difference between the two is greater than a preset threshold.

[0021] Therefore, by installing gas flow sensors in both the internal and external sections of the hydrogen supply pipeline, the control system can compare the hydrogen flow difference in real time based on the principle of mass conservation. Once the difference exceeds a preset threshold, the system can accurately identify the anomaly and immediately output a safety response command in the early stages of hydrogen leakage, before the concentration accumulates. This not only overcomes the shortcomings of traditional concentration detection, which relies on gas diffusion and results in a delayed response, but also achieves early warning and proactive intervention for leakage risks. This significantly improves the inherent safety level of hydrogen-related testing in the altitude environment chamber, effectively prevents safety hazards caused by hydrogen accumulation, and thus ensures that the testing process is safe and controllable. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of the fuel cell altitude environment chamber system according to an embodiment of this application; Figure 2 This is a schematic diagram of the arrangement of the hydrogen concentration sensor according to an embodiment of this application.

[0024] The attached diagram lists the components represented by each number as follows: 1. Altitude environmental chamber; 2. Fuel cell under test; 3. Hydrogen supply pipeline; 31. Inner section; 32. Outer section; 4. Hydrogen supply equipment; 5. Gas flow sensor; 6. Environmental chamber control unit; 7. Test bench control unit; 8. Fresh air system; 9. Atmospheric pressure fan; 10. Tail exhaust pipeline; 11. Hydrogen concentration detection device; 12. One-way valve; 13. Sealed door; 14. Altitude fan; 15. Explosion-proof camera; 16. Air conditioning system; 17. Smoke alarm system; 18. Fire alarm system; 19. Sprinkler system; 20. Absolute pressure sensor; 21. Relative humidity sensor; 22. Temperature sensor; 23. Pump-type hydrogen concentration sensor; 24. Diffusion-type hydrogen concentration sensor. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] This application provides a fuel cell altitude environment chamber system and control method, which can solve the problem of response lag caused by the reliance on hydrogen concentration detection in related technologies.

[0027] See Figure 1 and Figure 2 As shown, the first aspect of this application provides a fuel cell altitude environment cabin system, including: Altitude environment chamber 1, which is used to house the fuel cell under test 2 and provide a simulated altitude environment; The hydrogen supply unit includes a hydrogen supply device 4 located outside the altitude environment chamber 1 and connected to the fuel cell 2 under test via a hydrogen supply pipeline 3. The hydrogen supply pipeline 3 includes an internal section 31 and an external section 32 that are connected to each other. Both the internal section 31 and the external section 32 are equipped with gas flow sensors 5. The control system is connected to gas flow sensors 5 on the inner section 31 and the outer section 32 respectively, and is used to obtain the hydrogen flow rate through the inner section 31 and the outer section 32 respectively, and output a preset safety response command when the absolute value of the difference between the two is greater than a preset threshold.

[0028] This embodiment utilizes dual gas flow sensors 5 installed in both the internal section 31 and the external section 32 of the hydrogen supply pipeline 3 to compare the flow difference in real time using the principle of mass conservation. This configuration can accurately identify anomalies in the early stages of hydrogen leakage, before the concentration accumulates, overcoming the shortcomings of traditional concentration detection methods that rely on gas diffusion and result in a delayed response.

[0029] Once the difference exceeds the preset threshold, the system immediately outputs a safety response command, realizing early warning and proactive intervention of leakage risks, significantly improving the inherent safety level of hydrogen-related testing in the Altitude Environment Chamber 1, and ensuring that the testing process is safe and controllable.

[0030] In specific implementation, the gas flow sensor 5 can be a commercially available hydrogen flow meter. When the absolute value of the flow difference between the inner section 31 and the outer section 32 is less than or equal to a preset threshold (the preset threshold can be 2% of the hydrogen flow setting value, which is a pre-stored setting value), a leak is determined, and a concentration priority principle is adopted: if the concentration value measured by the concentration sensor exceeds the preset alarm threshold and triggers an alarm signal, it shall be taken as the standard; otherwise, the flow meter (built-in alarm) will be triggered to alarm, the machine will be shut down, and a sensor calibration prompt will be given.

[0031] It should be noted that the gas flow sensor 5 in this application is a higher-level concept, covering any device that can convert hydrogen flow into a processable signal, including but not limited to thermal film, ultrasonic, differential pressure or turbine sensors.

[0032] As a specific implementation of a complete instrument structure, the flow meter's core sensing function belongs to the category of gas flow sensor 5. The two are not mutually exclusive concepts, but rather different levels of device completeness. Any flow meter that can detect the flow rate of hydrogen gas is considered a subordinate embodiment of the gas flow sensor 5 of this application.

[0033] Firstly, in some alternative embodiments: see Figure 1 and Figure 2 As shown, this application embodiment provides a fuel cell altitude environment cabin system. The safety response commands of the fuel cell altitude environment cabin system include at least one of the following: an alarm signal for triggering an audible and visual alarm, a shutdown signal for controlling the hydrogen supply equipment 4 to shut down, and a display signal for displaying an abnormal prompt on the display interface.

[0034] In this embodiment, safety response commands can be configured in various combinations to ensure multi-dimensional handling of safety risks. Specifically, safety response commands include alarm signals to trigger audible and visual alarms, alerting on-site personnel through sound and light; and / or shutdown signals to control the hydrogen supply equipment 4 to perform shutdown operations, cutting off the hydrogen supply at its source; and / or display signals to pop up abnormal prompts on the control system's display interface, allowing operators to promptly identify the type of fault. The system can execute at least one of the above commands individually or in combination according to the risk level, thereby achieving graded response and precise control.

[0035] Firstly, in some alternative embodiments: see Figure 1 and Figure 2As shown, this application provides a fuel cell altitude environment chamber system. The control system of the fuel cell altitude environment chamber system includes an environment chamber control unit 6 for controlling the operation of the altitude environment chamber 1, and a test bench control unit 7 for controlling the test process of the fuel cell 2 under test. The environmental chamber control unit 6 is communicatively connected to the test bench control unit 7, and is configured to exchange safety status information and control commands bidirectionally to achieve safety linkage control; The safety status information includes at least one of hydrogen flow signal, hydrogen concentration signal, fire smoke signal and door status signal; the control commands include at least one of alarm signal, sequential shutdown command and emergency shutdown command.

[0036] In this embodiment, the control system adopts a dual-unit collaborative architecture, including an environmental chamber control unit 6 and a test bench control unit 7, which are connected via communication to achieve bidirectional data interaction. This deep integration mode breaks the traditional separation between the environmental chamber and the test bench system, allowing the test bench to remotely control the temperature, humidity, and altitude parameters of the environmental chamber, while the environmental chamber can automatically optimize its fresh air and heat dissipation strategies based on the hydrogen flow rate and power output of the test bench.

[0037] By exchanging safety status information and control commands in both directions, safe linkage control was achieved, which significantly reduced the safety risks caused by information silos in high-altitude testing and provided solid technical support for the reliability verification of fuel cells in extreme environments.

[0038] In specific implementation, the environmental chamber control unit 6 and the test bench control unit 7 are preferably host computers, but can also be PLCs (programmable logic controllers), embedded systems (such as microcontrollers, ARM, DSPs, etc.) or any other control devices with data acquisition, logic judgment and signal output functions. Those skilled in the art can select an appropriate hardware platform according to actual needs.

[0039] Firstly, in some alternative embodiments: see Figure 1 and Figure 2 As shown, this application embodiment provides a fuel cell altitude environment chamber system, which further includes a fresh air system 8 for providing fresh air to the altitude environment chamber 1, and an atmospheric pressure fan 9 for drawing in and expelling air from the altitude environment chamber 1; the air inlet of the atmospheric pressure fan 9 is connected to the exhaust pipe 10 of the fuel cell 2 system under test, and a hydrogen concentration detection device 11 is installed on the exhaust pipe 10.

[0040] In this embodiment, the coordinated operation of the fresh air system 8 and the atmospheric pressure fan 9 achieves effective air circulation within the altitude environment chamber 1 and timely exhaust of exhaust gases. The atmospheric pressure fan 9 directly draws air from the exhaust pipe 10 and the chamber, maintaining stable pressure between the exhaust and the chamber, preventing backflow of gas. Furthermore, combined with the hydrogen concentration detection device 11 on the exhaust pipe 10, it monitors the concentration of the exhaust gas in real time, ensuring that the hydrogen in the exhaust is diluted and discharged promptly. This avoids the risk of hydrogen accumulation in the chamber or exhaust pipe, improving the overall safety of the system.

[0041] Specifically, the fresh air system 8 and the atmospheric pressure fan 9 are connected to the altitude environment chamber 1 by ducts made of galvanized pipe material. The ducts are sealed to the shell of the altitude environment chamber to ensure that the altitude simulation effect of the altitude environment chamber 1 is not affected. The air inlet of the atmospheric pressure fan 9 is connected to the exhaust pipe 10 of the fuel cell 2 system under test, so that the exhaust gas is drawn out by the atmospheric pressure fan 9. At the same time, the atmospheric pressure fan 9 also directly draws air from the altitude environment chamber 1 through the duct to maintain the pressure stability of the exhaust and the chamber.

[0042] A hydrogen concentration detection device 11 is installed on the tailpipe 10. This device can be a hydrogen concentration detector. Those skilled in the art will understand that the connection between the atmospheric pressure fan 9 and the tailpipe 10 should ensure airtightness, and the installation position of the hydrogen concentration detection device 11 should facilitate sampling and accurately reflect the composition of the tail gas. Any sensor capable of detecting hydrogen concentration is considered a lower embodiment of the hydrogen concentration detection device 11 of this application.

[0043] Firstly, in some alternative embodiments: see Figure 1 and Figure 2 As shown, this application embodiment provides a fuel cell altitude environment chamber system. The hydrogen supply pipeline 3 of the fuel cell altitude environment chamber system is sealed to the chamber body of the altitude environment chamber 1. One-way valves 12 are provided on both the inner section 31 and the outer section 32 of the chamber. A sealing door 13 is provided on the chamber body of the altitude environment chamber 1.

[0044] In this embodiment, the hydrogen supply pipeline 3 is sealed to the cabin of the altitude environment chamber 1, and one-way valves 12 are installed on both the inner section 31 and the outer section 32. A sealing door 13 is installed on the cabin of the altitude environment chamber 1. The sealing door 13 is made of steel and has an independent positive pressure sealing airbag on its body.

[0045] The sealing principle involves filling the airbag with positive pressure gas, causing it to expand and thus achieving a tight seal between the door and the door frame. Those skilled in the art will understand that the above sealing method is only one specific implementation; any door structure capable of pressure compensation or active sealing (such as a rubber sealing strip combined with a pressure locking mechanism) is considered a lower embodiment of the sealed door 13 of this application and can be selected according to the actual pressure level.

[0046] Firstly, in some alternative embodiments: see Figure 1 and Figure 2 As shown in the figure, this application provides a fuel cell altitude environment cabin system, which further includes: Altitude fan 14 is used to adjust the absolute pressure inside the altitude environment chamber 1 to simulate the altitude environment. Explosion-proof camera 15, which is used to observe the test status inside the altitude environment chamber 1; Air conditioning system 16 is used to provide a simulated temperature environment inside the altitude environment cabin 1; Smoke alarm system 17 is used to monitor whether dense smoke is generated inside the altitude environment chamber 1; Fire alarm system 18 is used to monitor whether an open flame is generated inside the altitude environment chamber 1; Sprinkler system 19, which is used for spraying after a fire occurs in the altitude environment chamber 1; Absolute pressure sensor 20 is used to monitor the absolute pressure inside the altitude environment chamber 1 and convert it into an altitude signal; Relative humidity sensor 21 is used to monitor the humidity inside the altitude environment chamber 1; Temperature sensor 22 is used to monitor the temperature inside the altitude environment chamber 1.

[0047] In this embodiment, a comprehensive environmental chamber operation support system is constructed by integrating environmental simulation components and multi-dimensional safety monitoring equipment. The altitude fan 14 works in conjunction with the pressure sensor to achieve accurate altitude simulation, while the air conditioning system 16 and the temperature and humidity sensor work together to maintain a stable thermal and humidity environment inside the chamber, meeting the testing requirements of fuel cells under different climatic conditions.

[0048] Meanwhile, the smoke and fire alarm system 18, combined with the sprinkler system 19, constitutes a fire protection mechanism, while the explosion-proof camera 15 enables remote visual monitoring in hazardous environments. This configuration not only ensures precise control of environmental parameters but also enhances the safety of the testing process through multiple safety monitoring methods, ensuring timely response and protecting equipment and personnel safety in extreme environments or emergencies.

[0049] Specifically, the system also includes an altitude fan 14, an explosion-proof camera 15, an air conditioning system 16, a smoke alarm system 17, a fire alarm system 18, a sprinkler system 19, an absolute pressure sensor 20, a relative humidity sensor 21, and a temperature sensor 22. The altitude fan 14 is used to adjust the absolute pressure inside the chamber. The air conditioning system 16 is used to regulate the cabin temperature; the absolute pressure sensor 20, the relative humidity sensor 21 and the temperature sensor 22 are used to monitor the cabin pressure, humidity and temperature parameters in real time, respectively. The absolute pressure sensor 20 can also convert the pressure signal into an altitude signal for use by the control system.

[0050] The smoke alarm system 17 and the fire alarm system 18 are used to monitor the dense smoke and open flame in the cabin, respectively. The sprinkler system 19 is used for fire extinguishing after a fire occurs. The explosion-proof camera 15 is used to observe the test status in the cabin.

[0051] Those skilled in the art will understand that the specific models, quantities, and installation locations of the aforementioned sensors and alarm systems can be adjusted according to actual testing standards, and any device capable of achieving corresponding environmental monitoring or safety alarm functions is considered a subordinate embodiment of this application.

[0052] Firstly, in some alternative embodiments: see Figure 1 and Figure 2 As shown, this application embodiment provides a fuel cell altitude environment chamber system. The altitude environment chamber 1 of the fuel cell altitude environment chamber system has a rectangular shell. Multiple hydrogen concentration sensors are arranged inside the rectangular shell, which are spaced apart along the two diagonals of the top. The hydrogen concentration sensor includes multiple pump-type hydrogen concentration sensors 23 and multiple diffusion-type hydrogen concentration sensors 24 arranged alternately.

[0053] In this embodiment, a highly efficient three-dimensional hydrogen monitoring network is constructed by adopting a diagonal cross layout at the top of the cabin and combining pump-suction and diffusion sensors in an alternating arrangement. Based on the physical characteristic that hydrogen has a lower density than air and tends to accumulate at the top, the top layout ensures that leaked gas is captured first.

[0054] Among them, diffused sensors are responsible for large-area coverage and baseline monitoring, eliminating blind spots like a woven net; pump-suction sensors act as fixed-point vanguards, providing rapid response and positioning assistance. This hybrid arrangement ensures safety redundancy and eliminates monitoring blind spots while optimizing sensor configuration costs, achieving a balance between safety and economy, and significantly improving the reliability and response speed of leak detection.

[0055] Specifically, the altitude environment chamber 1 has a rectangular shell, with multiple hydrogen concentration sensors distributed at the top of the shell. In this embodiment, the sensors are spaced along the two diagonals of the top, specifically including five diffusion-type hydrogen concentration sensors 24 and four pump-type hydrogen concentration sensors 23. The diffusion-type sensors are installed near the center point of the diagonals and the four vertices, while the pump-type sensors are installed at the diagonal positions between adjacent diffusion-type sensors, forming an alternating monitoring network.

[0056] It should be noted that the above-mentioned number and location of sensors are only one preferred embodiment. Those skilled in the art can adjust the specific number and distribution density of sensors according to the cabin volume and safety level requirements. Any layout that uses different types of sensor combinations to achieve complementary coverage and fast response is considered a lower embodiment of this application.

[0057] See Figure 1 and Figure 2 As shown, a second aspect of this application provides a control method for a fuel cell altitude environment chamber system. Based on any of the above embodiments of the fuel cell altitude environment chamber system, the method includes: S1. The altitude environment chamber 1 provides a simulated altitude environment, and hydrogen is supplied to the fuel cell 2 under test through the hydrogen supply equipment 4 and the hydrogen supply pipeline 3. S2. The flow rate of hydrogen flowing through the inner section 31 is detected by the gas flow sensor 5 on the inner section 31, and the flow rate of hydrogen flowing through the outer section 32 is detected by the gas flow sensor 5 on the outer section 32. S3. The control system calculates the absolute value of the difference between the hydrogen flow rate in the cabin section 31 and the hydrogen flow rate in the cabin section 32, and outputs a preset safety response command when the absolute value is greater than a preset threshold. The safety response command includes at least one of the following: an alarm signal for triggering an audible and visual alarm, a shutdown signal for controlling the hydrogen supply equipment 4 to stop, and a display signal for displaying an abnormal prompt on the display interface.

[0058] The control method provided in this embodiment achieves early and accurate identification and proactive intervention of hydrogen leaks through a dual flow comparison mechanism in the same direction. Compared with traditional passive monitoring that relies on concentration diffusion, this method can trigger a safety response immediately at the initial stage of a leak, before hydrogen accumulates to a dangerous concentration, significantly reducing the safety risks caused by response lag.

[0059] Meanwhile, diversified safety response instructions ensure the timeliness and effectiveness of risk management, cut off potential hazards at the source, and significantly improve the inherent safety level of hydrogen-related testing in the Altitude Environment Chamber 1, providing a solid guarantee for the reliable verification of fuel cells in extreme environments.

[0060] In practice, the system collects flow data in real time from the inner section 31 and outer section 32 of the hydrogen supply pipeline during the hydrogen supply process, and calculates the absolute value of the difference between the two through the control system. Once the difference exceeds a preset threshold, the system determines that an abnormal leak has occurred, and autonomously outputs at least one of the following commands based on the risk level: audible and visual alarm, equipment shutdown, or interface prompt.

[0061] This flow monitoring logic based on the principle of mass conservation not only makes up for the monitoring blind spots of a single concentration sensor, but also ensures that operators can promptly learn about the status and block the hydrogen source through multiple response mechanisms, thus achieving closed-loop safety control of the testing process.

[0062] Secondly, in some alternative embodiments: see Figure 1 and Figure 2 As shown in the figure, this application provides a control method for a fuel cell altitude environment cabin system, the method further comprising: The preset hydrogen flow rate setting value is obtained in real time. When the hydrogen flow rate setting value changes, the fan speed of the fresh air system 8 and the speed of the atmospheric pressure fan 9 are adjusted synchronously. The fan speed of the fresh air system 8 is determined by the fresh air intake flow rate calculated based on the hydrogen flow rate setting and the preset dilution ratio. The speed of the atmospheric pressure fan 9 is determined by adding a preset speed difference to the fan speed of the fresh air system 8, in order to maintain the negative pressure environment in the altitude environment chamber 1.

[0063] This embodiment achieves proactive prevention rather than passive response in hydrogen-related safety by establishing a dynamic linkage mechanism between the hydrogen flow rate setpoint and the ventilation system rotation speed.

[0064] During testing, the system can adjust the fresh air and exhaust strategies in advance according to changes in hydrogen usage, ensuring that the hydrogen concentration in the chamber is always within a safe dilution range, fundamentally reducing the risk of leakage and accumulation during high-flow hydrogen testing.

[0065] Meanwhile, by maintaining a negative pressure environment inside the chamber and effectively guiding the airflow direction to prevent hydrogen from leaking out or stagnating, the inherent safety and operational reliability of the Altitude Environment Chamber 1 under complex testing conditions are significantly improved.

[0066] In practice, the altitude environment chamber 1 receives the hydrogen flow rate setpoint sent by the test bench in real time and adjusts the speed of the fresh air system 8 fan and the normal pressure fan 9 synchronously based on a preset algorithm. The fresh air intake flow rate is calculated according to the formula Q fresh air intake flow rate = k × Q hydrogen flow rate / 0.0899, where k is the dilution factor determined based on the chamber volume, and 0.0899 is the density value of hydrogen under standard conditions (kg / m³). The fresh air fan speed is determined by N fresh air = Q fresh air × C, where C is a calibrated proportional coefficient related to the fan size and duct resistance.

[0067] To maintain negative pressure inside the chamber, the speed of the atmospheric pressure fan 9 is set to be higher than the speed of the fresh air fan by a preset difference (e.g., 300 rpm). The system can store a table showing the correspondence between flow rate and speed. For example, when the hydrogen flow rate is 0-1000 nlpm, the speeds of the fresh air fan and the atmospheric pressure fan 9 are set to 1500 rpm and 1800 rpm respectively, and are gradually increased as the flow rate increases.

[0068]

[0069] Those skilled in the art will understand that the above formula parameters and corresponding tables are only one implementation method and can be calibrated and adjusted according to the actual duct resistance and safety standards.

[0070] Secondly, in some alternative embodiments: see Figure 1 and Figure 2 As shown in the figure, this application provides a control method for a fuel cell altitude environment cabin system, the method further comprising: The load power of the fuel cell 2 under test is acquired in real time. When the load power changes, the cooling power of the air conditioning system 16 and the fan speed of the fresh air system 8 are adjusted synchronously. The cooling power change of the air conditioning system 16 is determined by multiplying the load power change by a preset proportional coefficient, and the fan speed of the fresh air system 8 is determined by mapping the load power change to a preset speed.

[0071] This embodiment achieves dynamic matching between test conditions and environmental parameters by establishing a linkage control strategy between the load power and the environmental chamber's heat, humidity, and ventilation systems. When the fuel cell load changes, the system can synchronously adjust the air conditioning cooling power and the fresh air fan speed, ensuring that the heat generated by the fuel cell stack is removed in time to prevent overheating from affecting test accuracy, and also adjusting the ventilation volume according to the potential risk ratio of the power level, thus enhancing safety.

[0072] This follow-up control reduces the lag of manual adjustments, avoids energy waste at low loads and insufficient heat dissipation at high loads, significantly improves the automation and energy efficiency of the testing process, and provides environmental protection for the stable operation of fuel cells under different power steps.

[0073] In practice, the control system acquires the change in load power of the tested fuel cell 2 in real time and performs adjustments based on a preset algorithm. The change in cooling power of the air conditioning system 16 is configured according to a preset proportional coefficient of the change in load power, for example, it is set to 20% of the change in load power, i.e., P_air conditioning_change = P_load_change × 20%.

[0074] The fan speed of the fresh air system is determined based on the preset mapping relationship between the change in load power and the speed. For example, a corresponding table can be pre-stored: when the power change is 0-50kW, the speed is set to 1500rpm, and it is gradually increased to 2200rpm as the power range increases.

[0075]

[0076] The rotational speed of the atmospheric pressure fan 9 can be adjusted synchronously with reference to the aforementioned logic for maintaining negative pressure. Those skilled in the art will understand that the above proportional coefficients and mapping tables are merely examples; in practical applications, calibration and correction can be made based on the fuel cell heating characteristics and cabin heat capacity. Any scheme based on power signal-linked adjustment of environmental parameters is considered a subsequent embodiment of this application.

[0077] Secondly, in some alternative embodiments: see Figure 1 and Figure 2 As shown in the figure, this application provides a control method for a fuel cell altitude environment cabin system, the method further comprising: The hydrogen concentration in the tailpipe 10 is acquired in real time. When the hydrogen concentration in the tailpipe changes, the speed of the atmospheric pressure fan 9 is adjusted synchronously to keep the hydrogen concentration in the tailpipe within a safe range. Among them, the rotation speed of the atmospheric pressure fan 9 is positively correlated with the concentration of hydrogen gas in the exhaust, and the rotation speed of the fresh air system 8 is adjusted in conjunction with the rotation speed of the atmospheric pressure fan 9.

[0078] This embodiment achieves dynamic safety control of exhaust gases by real-time monitoring of the hydrogen concentration in the exhaust gas and adjusting the speed of the atmospheric pressure fan 9 accordingly. In response to potential hydrogen fluctuations in fuel cell exhaust gases, the system can instantly respond to concentration changes, automatically increasing exhaust capacity to prevent hydrogen accumulation, while maintaining a lower speed to save energy when the concentration is low.

[0079] Furthermore, the coordinated adjustment of the fresh air system 8 fan and the atmospheric pressure fan 9 ensures pressure balance within the chamber, preventing negative pressure imbalance or airflow turbulence caused by excessive exhaust. This closed-loop control strategy significantly improves the safety and energy efficiency of exhaust treatment, ensures the timely removal of harmful gases during testing, and prevents backflow or retention of hydrogen in the exhaust, thus avoiding potential safety hazards.

[0080] In practice, the control system acquires the hydrogen concentration signal from the tailpipe 10 in real time and adjusts the speed of the atmospheric pressure fan 9 according to the positive correlation between the concentration value and the fan speed. For example, the correspondence between concentration range and speed can be preset: when the instantaneous hydrogen concentration is 0-20000ppm, the speed is set to 2100rpm; when the concentration rises to 20000-30000ppm, it is increased to 2300rpm; when the concentration rises to 30000-40000ppm, it is increased to 2500rpm; and when the concentration exceeds 40000ppm, the speed is adjusted to the maximum value of 3000rpm to ensure maximum airflow for venting at high concentrations. The speed of the fresh air system 8 fan is adjusted in conjunction with the speed of the atmospheric pressure fan 9 to maintain a stable pressure difference inside the chamber.

[0081]

[0082] Those skilled in the art will understand that the above concentration threshold and rotation speed parameters are only a calibration example. In actual applications, they can be optimized and modified according to the volume of the tailpipe 10 and safety standards. Any scheme that adjusts the exhaust air volume based on the tailpipe concentration signal is considered a lower embodiment of this application.

[0083] Secondly, in some alternative embodiments: see Figure 1 and Figure 2 As shown in the figure, this application provides a control method for a fuel cell altitude environment cabin system, the method further comprising: When at least two of the three states of hydrogen flow rate setpoint change, load power change, and tail exhaust hydrogen concentration change occur simultaneously, the speed of fresh air system 8 fan and the speed of atmospheric pressure fan 9 corresponding to each state are obtained respectively, and the larger value is selected as the final control speed. The preset dilution factor, preset proportional coefficient, preset speed difference, and preset speed mapping relationship are all reference values. Accurate values ​​are obtained through preliminary calibration experiments before actual operation and stored in the control system.

[0084] This embodiment solves the control conflict problem under multi-variable coupled conditions by using multi-source signal fusion and priority arbitration mechanism. When multiple states such as hydrogen flow rate, load power and exhaust concentration change simultaneously, the system adopts the "highest principle" to select the maximum fan speed, ensuring that sufficient ventilation can still be provided under the most stringent safety requirements, and avoiding safety hazards caused by the lag or underestimation of a single signal.

[0085] Meanwhile, by determining key control parameters through preliminary calibration experiments, the impact of individual equipment differences and changes in duct resistance was eliminated, significantly improving the adaptability and accuracy of the control strategy and ensuring the stable operation and inherent safety of the system under different test scenarios.

[0086] In practice, the control system calculates the corresponding speeds of the fresh air system 8 fan and the atmospheric pressure fan 9 based on the hydrogen flow rate setpoint, the change in load power, and the exhaust hydrogen concentration. When at least two states change simultaneously, the system compares the calculated speed values ​​and selects the larger value as the final control command to output to the fan driver.

[0087] Furthermore, the preset dilution factor, proportional coefficient, speed difference, and speed mapping relationship are initially reference values. Accurate values ​​are obtained through preliminary calibration experiments before actual operation and stored in the non-volatile memory of the control system. Those skilled in the art will understand that the above calibration process may include steps such as no-load testing and standard gas injection testing. Any control logic based on multivariate comparison to obtain the maximum value and parameter calibration is considered a lower-level embodiment of this application.

[0088] Secondly, in some alternative embodiments: see Figure 1 and Figure 2 As shown in the figure, this application provides a control method for a fuel cell altitude environment cabin system, the method further comprising: When dense smoke is detected inside the altitude environment chamber 1, the tested fuel cell 2 is shut down immediately, and the fresh air system 8 and the atmospheric pressure fan 9 are both controlled to operate at their rated maximum air volume. When an open flame is detected inside the altitude environment chamber 1, the tested fuel cell 2 is shut down immediately, the fresh air system 8 is stopped, and the sprinkler system 19 is activated. When it is detected that the sealing door 13 of the altitude environment chamber 1 is not closed or the seal fails, the test operation of the fuel cell 2 under test is prohibited or the fuel cell 2 under test is shut down sequentially.

[0089] This embodiment employs maximum airflow for smoke extraction in dense smoke scenarios and uses air-stop spraying for fire suppression in open flame scenarios, avoiding secondary disasters caused by ventilation fueling combustion. Simultaneously, the sequential shutdown procedure, through step-by-step unloading, hydrogen cutoff, purging, and cooling, effectively prevents safety hazards caused by thermal shock from sudden shutdown of the fuel cell stack and residual hydrogen in pipelines.

[0090] Combined with the 13-state interlock logic of the sealed door, it ensures that testing and operation are only permitted under the premise of physical environmental safety, which significantly improves the system's emergency response capability and intrinsic safety level under extreme failures.

[0091] In practice, when the control system detects a dense smoke signal, it controls the tested fuel cell 2 to shut down urgently and drives the fresh air system 8 and the atmospheric pressure fan 9 to operate at the rated maximum air volume; when it detects an open flame signal, it controls the tested fuel cell 2 to shut down urgently, stops the fan operation, and starts the spray system 19. When it detects that the sealing door 13 is not closed or the seal is ineffective, the system prohibits test startup or triggers sequential shutdown during operation.

[0092] For example, the sequential shutdown procedure for the tested fuel cell 2 specifically includes the following steps: First, a command is sent to the electronic load to reduce the stack output current to 0A or below the lowest threshold that the electronic load can stably maintain within time t1, and optionally disconnect the load contactor. After confirming that the current has stabilized at 0A (or below the preset safe current threshold) and has remained stable for at least t2 seconds, close the main shut-off valve on the hydrogen supply line 3. Then open the purge valve and use nitrogen or (if the stack is tolerant) air to purge the anode side of the stack and the pipeline for t3 seconds or until the hydrogen concentration sensor reports that the concentration is lower than the preset safety line. After purging, if the current fuel cell stack temperature is higher than the preset safe temperature (e.g., 50°C), continue to run the cooling water pump and circulating fan until the temperature drops below that value; otherwise, stop the cooling components directly. Finally, after confirming that the main shut-off valve and purge valve are closed and the load is disconnected, disconnect the power supply to the control system.

[0093] It should be noted that the above t1, t2, t3 and safe temperature values ​​are only one implementation example and can be calibrated and adjusted according to the characteristics of the fuel cell stack and safety standards.

[0094] Secondly, in some alternative embodiments: see Figure 1 and Figure 2 As shown in the figure, this application provides a control method for a fuel cell altitude environment cabin system, the method further comprising: Real-time acquisition of hydrogen concentration sensor readings inside altitude environment chamber 1; If the detected value reaches the first preset threshold, an alarm signal will be output through the control system. If the detected value reaches the second preset threshold, the control system will output a sequential shutdown command. If the detected value reaches the third preset threshold, the control system will output an emergency stop command and control the fresh air system 8 and the normal pressure fan 9 to operate at the rated maximum air volume. The first preset threshold, the second preset threshold, and the third preset threshold increase sequentially.

[0095] This embodiment achieves refined handling of safety risks by establishing a graded early warning and linkage control mechanism for hydrogen concentration. Differentiated response strategies are adopted for different concentrations of leakage risk, which can promptly alert operators in the low-risk stage and decisively execute shutdown and ventilation operations in the high-risk stage, avoiding the response lag or overreaction caused by single threshold control.

[0096] This hierarchical logic effectively balances testing continuity and safety, ensuring intervention in the early stages of hydrogen concentration accumulation to reduce the risk of explosion. At the same time, sequential shutdown protects the fuel cell stack from damage caused by sudden shutdown, improving the overall reliability and emergency response capability of the system.

[0097] In practice, the system monitors the nine hydrogen concentration sensors located on the top of the environmental chamber 1 in real time. When the value detected by any sensor reaches the first preset threshold (e.g., 10% LEL), the control system outputs an alarm signal, triggering the alarm on the system test bench and the environmental chamber control unit 6, as well as the flashing of internal and external alarm lights; where LEL stands for Lower Explosive Limit. When the second preset threshold (e.g., 30% LEL) is reached, a sequential shutdown command is output to execute steps such as stopping load loading, closing the hydrogen supply valve, performing gas purging, and stopping the auxiliary system, and a pop-up window is displayed on the interface to prompt the user. When the third preset threshold (e.g., 50% LEL) is reached, an emergency stop command is output to control the test bench to stop in an emergency and drive the fresh air system 8 and the normal pressure fan 9 to increase their operation (e.g., adjust to the rated maximum air volume) to accelerate dilution.

[0098] Those skilled in the art will understand that the above-mentioned threshold and number of sensors are only a preferred configuration and can be adjusted according to the cabin volume and safety standards. Any method based on multi-level concentration threshold linkage control is considered as a lower embodiment of this application.

[0099] For example, the safety matrix and signal interaction logic between the altitude environment chamber 1 and the system test bench in this application embodiment are shown in the following table:

[0100] In some embodiments of this application, the system test bench control unit 7 is configured to send environmental setting instructions and operating status signals to the altitude environment chamber 1 control unit 6, so as to realize the test bench's dominant control and linkage adjustment of the environment chamber.

[0101] Specifically, the test bench can set the target temperature, humidity and altitude parameters of the environmental chamber, and send signals to enable temperature and humidity control and to start fresh air exhaust. The environmental chamber then performs simulated environment construction and equipment start-up and shutdown accordingly. During the test run, the test bench transmits real-time monitoring signals of hydrogen volumetric flow rate, load power, and exhaust hydrogen concentration to the environmental chamber. Based on these signals, the environmental chamber automatically adjusts the fresh air volume, air conditioning heat dissipation, and exhaust volume of the atmospheric pressure fan. For example, it adjusts the fresh air volume based on the hydrogen flow rate to predict leakage risk, matches the heat dissipation requirements based on the load power, and dynamically optimizes the exhaust efficiency based on the exhaust concentration.

[0102] This two-way interactive mechanism not only achieves precise matching between test conditions and environmental parameters, but also further improves the system's safety response speed and energy efficiency through predictive ventilation control based on flow rate and power. Those skilled in the art will understand that the above signal types and control logic are only one implementation method, and any scheme that adjusts the environmental chamber operating parameters based on test bench commands is considered a subsequent embodiment of this application.

[0103] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0104] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, 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 limitations, 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.

[0105] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A fuel cell altitude environment cabin system, characterized in that, include: An altitude environment chamber (1) is used to house the fuel cell under test (2) and provide a simulated altitude environment; The hydrogen supply unit includes a hydrogen supply device (4) located outside the altitude environment chamber (1) and connected to the fuel cell (2) under test via a hydrogen supply pipeline (3). The hydrogen supply pipeline (3) includes an internal section (31) and an external section (32) connected to each other. Both the internal section (31) and the external section (32) are equipped with gas flow sensors (5). The control system is connected to gas flow sensors (5) on the inner section (31) and the outer section (32) respectively, for acquiring the hydrogen flow rate through the inner section (31) and the outer section (32) respectively, and outputting a preset safety response command when the absolute value of the difference between the two is greater than a preset threshold.

2. The fuel cell altitude environment cabin system as described in claim 1, characterized in that: The safety response command includes at least one of the following: an alarm signal for triggering an audible and visual alarm, a shutdown signal for controlling the shutdown of the hydrogen supply equipment (4), and a display signal for displaying an abnormal prompt on the display interface.

3. The fuel cell altitude environment cabin system as described in claim 1, characterized in that: The control system includes an environmental chamber control unit (6) for controlling the operation of the altitude environment chamber (1) and a test bench control unit (7) for controlling the test process of the fuel cell under test (2). The environmental chamber control unit (6) is communicatively connected to the test bench control unit (7) and configured to exchange safety status information and control commands bidirectionally to achieve safety linkage control; The safety status information includes at least one of hydrogen flow signal, hydrogen concentration signal, fire smoke signal, and hatch status signal; the control commands include at least one of alarm signal, sequential shutdown command, and emergency shutdown command.

4. The fuel cell altitude environment cabin system as described in claim 1, characterized in that: It also includes a fresh air system (8) for providing fresh air to the altitude environment chamber (1), and an atmospheric pressure fan (9) for drawing in and expelling air from the altitude environment chamber (1). The air inlet of the atmospheric pressure fan (9) is connected to the tailpipe (10) of the fuel cell (2) system under test, and a hydrogen concentration detection device (11) is installed on the tailpipe (10). The hydrogen supply pipeline (3) is sealed to the body of the altitude environment chamber (1), and a one-way valve (12) is provided on both the inner section (31) and the outer section (32); a sealing door (13) is provided on the body of the altitude environment chamber (1).

5. The fuel cell altitude environment cabin system as described in claim 1, characterized in that, Also includes: An altitude fan (14) is used to adjust the absolute pressure inside the altitude environment chamber (1) to simulate an altitude environment. An explosion-proof camera (15) is used to observe the test status inside the altitude environment chamber (1); An air conditioning system (16) is used to provide a simulated temperature environment inside the altitude environment chamber (1); A smoke alarm system (17) is used to monitor whether dense smoke is generated inside the altitude environment chamber (1); A fire alarm system (18) is used to monitor whether an open flame is generated inside the altitude environment chamber (1); A sprinkler system (19) is used for spraying after a fire occurs in the altitude environment chamber (1); An absolute pressure sensor (20) is used to monitor the absolute pressure inside the altitude environment chamber (1) and convert it into an altitude signal; A relative humidity sensor (21) is used to monitor the humidity inside the altitude environment chamber (1); Temperature sensor (22) is used to monitor the temperature inside the altitude environment chamber (1).

6. The fuel cell altitude environment cabin system as described in claim 1, characterized in that: The cabin of the altitude environment chamber (1) is a rectangular shell, and multiple hydrogen concentration sensors are arranged inside the rectangular shell, which are distributed at intervals along the two diagonals of the top. The hydrogen concentration sensor includes multiple pump-type hydrogen concentration sensors (23) and multiple diffusion-type hydrogen concentration sensors (24) arranged alternately.

7. A control method for a fuel cell altitude environment chamber system, based on the fuel cell altitude environment chamber system according to any one of claims 1 to 6, characterized in that, The method includes: The altitude environment chamber (1) provides a simulated altitude environment, and hydrogen is supplied to the fuel cell (2) under test through the hydrogen supply equipment (4) and the hydrogen supply pipeline (3). The flow rate of hydrogen gas flowing through the inner section (31) is detected by a gas flow sensor (5) on the inner section (31), and the flow rate of hydrogen gas flowing through the outer section (32) is detected by a gas flow sensor (5) on the outer section (32). The control system calculates the absolute value of the difference between the hydrogen flow rate in the cabin section (31) and the hydrogen flow rate in the cabin section (32), and outputs a preset safety response command when the absolute value is greater than a preset threshold. The safety response command includes at least one of the following: an alarm signal for triggering an audible and visual alarm, a shutdown signal for controlling the shutdown of the hydrogen supply equipment (4), and a display signal for displaying an abnormal prompt on the display interface.

8. The control method for the fuel cell altitude environment chamber system as described in claim 7, characterized in that, The method further includes: The preset hydrogen flow rate setting value is obtained in real time. When the hydrogen flow rate setting value changes, the fan speed of the fresh air system (8) and the speed of the atmospheric pressure fan (9) are adjusted synchronously. The load power of the fuel cell under test (2) is acquired in real time. When the load power changes, the cooling power of the air conditioning system (16) and the fan speed of the fresh air system (8) are adjusted synchronously. The hydrogen concentration in the tailpipe (10) is obtained in real time. When the hydrogen concentration in the tailpipe changes, the speed of the atmospheric pressure fan (9) is adjusted synchronously to keep the hydrogen concentration in the tailpipe within a safe range. When at least two of the three states of hydrogen flow rate set value change, load power change and tail exhaust hydrogen concentration change occur simultaneously, the speed of fresh air system (8) fan and the speed of atmospheric pressure fan (9) corresponding to each state are obtained respectively, and the larger value is selected as the final control speed.

9. The control method for the fuel cell altitude environment chamber system as described in claim 7, characterized in that, The method further includes: When dense smoke is detected in the altitude environment chamber (1), the tested fuel cell (2) is shut down in an emergency, and the fresh air system (8) and the normal pressure fan (9) are both operated at their rated maximum air volume. When an open flame is detected in the altitude environment chamber (1), the tested fuel cell (2) is shut down in an emergency, the fresh air system (8) is stopped, and the spray system (19) is started. When it is detected that the sealing door (13) of the altitude environment chamber (1) is not closed or the seal fails, the test operation of the fuel cell (2) under test is prohibited or the fuel cell (2) under test is shut down sequentially.

10. The control method for the fuel cell altitude environment chamber system as described in claim 7, characterized in that, The method further includes: Real-time acquisition of the hydrogen concentration sensor values ​​inside the altitude environment chamber (1); If the detected value reaches the first preset threshold, the control system is controlled to output an alarm signal. If the detected value reaches the second preset threshold, the control system will output a sequential shutdown command. If the detected value reaches the third preset threshold, the control system will output an emergency stop command and control the fresh air system (8) and the normal pressure fan (9) to operate at the rated maximum air volume. The first preset threshold, the second preset threshold, and the third preset threshold increase sequentially.

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