A thermal cycle test pressure multi-parameter simulation control system and method

Abstract

The application relates to the technical field of environmental simulation test evaluation, and provides a thermal cycle test pressure multi-parameter simulation control system and method, the method comprising the following steps: a temperature-controllable cabin, a control cabinet in communication with the temperature-controllable cabin, a control unit and an air source unit; the control unit is used for controlling an air extraction operation unit, a first air supplement operation unit and a second air supplement operation unit in the control cabinet to perform air extraction operation, first air supplement operation and second air supplement operation, so as to cooperatively control multiple environmental parameters in the temperature-controllable cabin during a thermal cycle test. The application realizes real-time monitoring and coupled accurate control of pressure and oxygen concentration in a test environment, and effectively ensures the stability and accuracy of the test environment.

Description

Technical Field

[0001] This application relates to the field of environmental simulation testing technology, specifically to a multi-parameter simulation control system and method for thermal cycling test pressure. Background Technology

[0002] In testing aerospace and equipment used in special high-altitude environments, it is necessary to simulate a thermal cycling environment with low pressure (e.g., 54.5 kPa) and a specific oxygen concentration. Traditional test chambers often only control pressure or temperature, making it difficult to achieve precise coupling control of pressure changes and oxygen concentration ratios caused by the thermal expansion and contraction of gases during drastic temperature fluctuations (thermal cycling).

[0003] In specific space missions or extreme environment simulations, to ensure personnel safety and operational efficiency, sealed cabins often employ a low-pressure, high-oxygen simulated environment (e.g., total pressure of approximately 54 kPa and oxygen concentration of over 40%). However, this simulated environment places stringent requirements on the equipment inside the cabin; the equipment must operate stably under low-pressure, high-oxygen conditions to address potential fire risks and accelerated oxidation issues.

[0004] Under low pressure, the heat exchange mechanisms between the product and the external environment (such as convection, radiation, and conduction) exhibit characteristics drastically different from those under normal pressure and in a vacuum. Simultaneously, a high-oxygen environment significantly increases the product's combustion risk and oxidation rate. Therefore, conducting thermal cycling tests under low pressure and high-oxygen conditions is a crucial step in obtaining equipment thermal performance data and assessing its environmental adaptability.

[0005] However, during environmental control, there is a strong coupling effect among pressure, oxygen concentration, and temperature within the container. As the temperature rises and falls during thermal cycling, the pressure fluctuates positively. If only conventional evacuation or venting methods are used to stabilize the pressure, the oxygen concentration will inevitably deviate from the target value, making it difficult to achieve synchronous and precise control of pressure and oxygen concentration, thus failing to meet the requirements of high-precision experiments.

[0006] Therefore, it is necessary to provide a new multi-parameter simulation control system and method for thermal cycling test pressure to solve the above problems. Summary of the Invention

[0007] The purpose of this application is to provide a multi-parameter simulation control system and method for thermal cycling test pressure, which can solve at least one of the technical problems mentioned above. The specific solution is as follows: According to a specific embodiment of this application, this application provides a multi-parameter simulation control system for thermal cycling test pressure, comprising: a temperature-controlled chamber, which includes a test tank and a shelf compartment disposed within the test tank, the shelf compartment being used to place the test specimen; a cold plate, a temperature sensor, a vacuum pressure transmitter, and an oxygen concentration sensor probe being disposed within the test tank; a control cabinet communicating with the temperature-controlled chamber, the control cabinet being provided with a vacuuming operation unit, a first gas replenishment operation unit, and a second gas replenishment operation unit; a control unit, used to control the vacuuming operation unit, the first gas replenishment operation unit, and the second gas replenishment operation unit within the control cabinet to perform vacuuming operations, first gas replenishment operations, and second gas replenishment operations to coordinately control multiple environmental parameters within the temperature-controlled chamber during the thermal cycling test, the environmental parameters including gas concentration, pressure, and temperature; and a gas source unit, which includes a first nitrogen cylinder and an oxygen cylinder respectively communicating with the first gas replenishment operation unit and the second gas replenishment operation unit.

[0008] According to a specific embodiment of this application, this application provides a multi-parameter simulation control method for thermal cycling test pressure, which adopts the multi-parameter simulation control system for thermal cycling test pressure described in this application, including: setting the target pressure and target oxygen concentration for the current thermal cycling test, and establishing a simulated test environment; monitoring the pressure and oxygen concentration of the test specimen placed in a temperature-controlled chamber within the simulated test environment, wherein the current temperature of the simulated test environment is the target temperature; when the temperature inside the temperature-controlled chamber rises and the current pressure inside the temperature-controlled chamber is greater than the target pressure, determining an evacuation operation or a gas replenishment operation to adjust the pressure based on the deviation between the current pressure and the target pressure, thereby adjusting the current pressure to the target pressure, wherein, during the pressure adjustment process, when a deviation between the oxygen concentration and the target oxygen concentration is detected, determining to initiate a first gas replenishment operation or a second gas replenishment operation.

[0009] Compared with the prior art, the above-described solutions of this application have at least the following beneficial effects: This application addresses the real-time monitoring and precise control of pressure and oxygen concentration in complex temperature cycling test environments. This effectively ensures the stability and accuracy of the test environment. The butterfly valve opening is automatically adjusted based on the difference between the current pressure and the target pressure, achieving high-precision pressure and oxygen concentration control. The pressure can be stabilized within a specified range of the target pressure (e.g., ...). Within a range of 1 kPa, the oxygen concentration can be stabilized at the target oxygen concentration (e.g., target oxygen concentration). Within 3% range, with small and stable fluctuations, a coupled control system for temperature, pressure and oxygen concentration has been achieved, which can provide key technical support for the reliability verification of spacecraft equipment in special environments. Attached Figure Description

[0010] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings: Figure 1 This is a schematic diagram of the framework of the multi-parameter simulation control system for thermal cycling test pressure according to an embodiment of this application; Figure 2 This is a flowchart illustrating the multi-parameter simulation control method for thermal cycling test pressure according to an embodiment of this application.

[0011] Explanation of reference numerals in the attached figures: 2: First flange; 4: Second flange; 5: Oxygen concentration transmitter; 6: Fourth control valve; 7: Vacuum gauge; 8: First control valve; 9: Third control valve; 10: Temperature-controlled chamber; 11: Test tank; 13: Shelf compartment; 14: Oxygen concentration sensor probe; 15: Test piece; 16: Placement of temperature control components; 20: Vacuuming operation unit; 21: Butterfly valve; 22: Baffle valve; 23: Vacuum pump; 30: First gas replenishment operation unit; 34: Second control valve; 33: Nitrogen pressure transmitter; 32: Nitrogen charging solenoid valve; 35: Flow controller; 36: First nitrogen charging solenoid valve; 37: Second nitrogen charging solenoid valve; 38: Third nitrogen charging solenoid valve; 39: Fourth nitrogen charging solenoid valve; 40: Second gas replenishment operation unit; 43: Fourth oxygen charging solenoid valve; 44: Oxygen pressure transmitter; 45: Fifth control valve; 46: First oxygen charging solenoid valve; 47: Second oxygen charging solenoid valve; 48: Third oxygen charging solenoid valve; 50: Control unit; 51: Controller; 52: Switch; 53: Remote control computer; 60: Gas source unit; 61: Nitrogen cylinder; 62: Oxygen cylinder. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0013] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the application. The singular forms “a,” “said,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms, and “multiple” generally includes at least two unless the context clearly indicates otherwise.

[0014] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0015] It should be understood that although the terms first, second, third, etc., may be used in the embodiments of this application for description, these descriptions should not be limited to these terms. These terms are only used to distinguish the descriptions. For example, first may also be referred to as second without departing from the scope of the embodiments of this application, and similarly, second may also be referred to as first.

[0016] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or device that includes said element.

[0017] The purpose of this application is to provide a multi-parameter simulation control system for thermal cycling test pressure. This system includes a temperature-controlled chamber, a control cabinet connected to the chamber, a control unit, and a gas source unit. It is designed for real-time monitoring and precise control of pressure and oxygen concentration under complex temperature cycling test environments, effectively ensuring the stability and accuracy of the test environment. The system automatically adjusts the butterfly valve opening based on the deviation between the current pressure and the target pressure, achieving high-precision pressure and oxygen concentration control. The pressure can be stabilized within a specified range of the target pressure (e.g., [missing information]). Within a range of 1 kPa, the oxygen concentration can be stabilized at the target oxygen concentration (e.g., target oxygen concentration). Within a 3% range, with small and stable fluctuations, a coupled control system for temperature, pressure, and oxygen concentration was achieved. Due to its high control precision, the consumption of oxygen and nitrogen was significantly reduced, thereby saving test costs; providing key technical support for the reliability verification of spacecraft equipment under special environments.

[0018] Furthermore, during the experiment, the pressure could be stabilized within the range of 53.5 kPa to 55.5 kPa, and the oxygen concentration could be controlled above 48.6%, with a control accuracy better than 3%. In addition, the system also has an alarm function, supports remote monitoring, and its environmental simulation capabilities cover a wide range of areas. 45℃~ The temperature range is 80℃.

[0019] Furthermore, the system of this application has a compact structure, with multiple adjustment functions integrated into a single control cabinet, facilitating free movement and rapid deployment, and improving adaptability to different experiments. The system of this application has the function of automatically controlling pressure and oxygen concentration, and also supports automatic alarms, remote control, and remote monitoring, significantly improving the level of intelligence in the experiment.

[0020] The following is in conjunction with the appendix Figure 1 Detailed description of optional embodiments of the system in this application.

[0021] like Figure 1 As shown, this application provides a multi-parameter simulation control system for thermal cycling test pressure. The multi-parameter simulation control system includes a temperature-controlled chamber 10, a control cabinet connected to the temperature-controlled chamber 10, a control unit 50, and a gas source unit 60. The control cabinet is equipped with a vacuuming operation unit 20, a first gas replenishment operation unit 30, and a second gas replenishment operation unit 40. The control unit 50 controls the vacuuming operation unit 20, the first gas replenishment operation unit 30, and the second gas replenishment operation unit 40 within the control cabinet to perform vacuuming, first gas replenishment, and second gas replenishment operations to collaboratively control multiple environmental parameters within the temperature-controlled chamber 10.

[0022] Specifically, the temperature-controlled chamber 10 includes a test tank 11 and a shelf compartment 13 arranged inside the test tank 11, wherein the shelf compartment 13 is used to place the test specimen 15 to be tested. The shelf compartment 13 is filled with bath oil.

[0023] Specifically, the test piece 15 is a spacecraft test piece, especially a test piece for special application scenarios of spacecraft (such as a spacecraft cabin dust removal device, a cabin human body radiation measurement equivalent instrument, a cabin wireless transmitter and receiver, a cabin personal noise dosimeter, etc.). The special application scenarios of spacecraft include, for example, the application scenario of oxygen intake and nitrogen removal, the application environment of the lander sealed cabin (e.g., total pressure of 54 kPa, oxygen concentration of more than 40%), and the low-pressure high-oxygen test environment (especially the thermal cycling test of the spacecraft's cabin equipment under low-pressure high-oxygen conditions).

[0024] from Figure 1 As can be seen, an oxygen concentration sensor probe 14 is installed inside the test tank 11. A temperature control component 16 is connected to the outside of the test tank 11. The temperature control component 16 is used to adjust the temperature of the bath oil in the shelf interlayer 13 so that the temperature inside the test tank 11 reaches the target temperature of the simulated test environment.

[0025] In this example, the test tank 11 also includes a cold plate (not shown in the figure), a temperature sensor (not shown in the figure), and a vacuum pressure transmitter (not shown in the figure). The cold plate is located in the shelf compartment 13. The test specimen 15 is placed on the cold plate in the shelf compartment 13. Temperature control points and temperature measuring points are affixed to the designated locations on the test specimen 15 as required by the submitter. If the test specimen 15 is not suitable for affixing temperature control points, the temperature control points can be affixed to the cold plate in the shelf compartment 13 inside the test tank 11 where the test specimen 15 is placed, to control the temperature of the cold plate.

[0026] Specifically, the control cabinet is connected to the temperature-controlled chamber 10, and the control cabinet is equipped with an air extraction operation unit 20, a first air replenishment operation unit 30, and a second air replenishment operation unit 40.

[0027] More specifically, the evacuation operation unit 20 includes a butterfly valve 21, a baffle valve 22, and an evacuation pump 23. A first control valve 8 is also provided between the butterfly valve 21 of the evacuation operation unit 20 and the test tank 11. The first control valve 8 is, for example, a manual valve.

[0028] Furthermore, the first gas replenishment operation unit 30 includes a second control valve 34, a nitrogen pressure transmitter 33, and a nitrogen filling solenoid valve 32, which are connected to the gas source unit 60 (specifically a nitrogen cylinder).

[0029] exist Figure 1 In the example, a third control valve 9 is also provided between the temperature-controlled chamber 10 and the first gas replenishment operation unit 30. The first gas replenishment operation unit 30 includes four gas replenishment pipelines: a first gas replenishment pipeline, a second gas replenishment pipeline, a third gas replenishment pipeline, and a fourth gas replenishment pipeline. The first, second, third, and fourth gas replenishment pipelines are respectively equipped with a first nitrogen replenishment solenoid valve 36, a second nitrogen replenishment solenoid valve 37, a third nitrogen replenishment solenoid valve 38, and a fourth nitrogen replenishment solenoid valve 39. A flow controller 35 is also provided on the first gas replenishment pipeline. The first gas replenishment operation unit 30 is used to replenish nitrogen into the test tank 11.

[0030] Specifically, the second gas replenishment operation unit 40 includes a fifth control valve 45, an oxygen pressure transmitter 44, and a fourth oxygen filling solenoid valve 43, all connected to the gas source unit 60 (specifically, an oxygen cylinder). The second gas replenishment operation unit 40 is used to fill the test tank 11 with oxygen.

[0031] Furthermore, the second gas replenishment operation unit 40 includes a fifth gas replenishment pipeline, a sixth gas replenishment pipeline, and a seventh gas replenishment pipeline. The fifth gas replenishment pipeline, the sixth gas replenishment pipeline, and the seventh gas replenishment pipeline are respectively equipped with a first oxygen replenishment solenoid valve 46, a second oxygen replenishment solenoid valve 47, and a third oxygen replenishment solenoid valve 48.

[0032] In one embodiment for achieving high-precision control, to achieve smoother and finer gas concentration adjustment, an oxygen flow controller (whose structure and connection method are similar to the flow controller 35 in the first gas replenishment unit 30) is added to the gas filling pipeline of the second gas replenishment operation unit 40. This oxygen flow controller allows for stepless continuous adjustment of the oxygen volume flow rate entering the test tank 11 under a fixed gas source pressure.

[0033] like Figure 1 As shown, a vacuum gauge (or vacuum line) 7 is also installed on the outside of the test tank 11. A fourth control valve 6, such as a manual valve, is also installed between the vacuum gauge 7 and the test tank 11. The vacuum gauge 7 is used to measure the vacuum level inside the test tank 11 to accurately measure the pressure value inside the test tank 11. The oxygen concentration sensor probe 14 of the oxygen concentration sensor is installed inside the test tank 11 to measure the oxygen concentration inside the test tank 11, which can effectively ensure real-time monitoring and control of the oxygen concentration. For example, when oxygen needs to be added, the test tank 11 is connected to the corresponding gas filling pipeline in the second gas replenishment operation unit 40 to fill in the corresponding amount of oxygen.

[0034] Furthermore, the first flange 2 is used to connect the evacuation operation unit 20, the fourth control valve 6, and the test tank 11. The second flange 4 is used to connect the first gas replenishment operation unit 30 (specifically the third control valve 9), the second gas replenishment operation unit 40, the first oxygen concentration sensor probe 14, and the oxygen concentration transmitter 5.

[0035] Specifically, the second flange 4 is provided with mounting holes for connecting the oxygen concentration sensor inside the test tank 11 and the oxygen concentration transmitter 5 outside the test tank 11, and is also provided with a connector for connecting multiple gas filling pipelines.

[0036] The control unit 50 of this application will now be described.

[0037] Specifically, the control unit 50 includes a controller 51, a switch 52, and a remote control computer 53. The controller 51 is, for example, a programmable logic controller (PLC). A network cable connection is used to enable remote monitoring and control via computer. The remote control computer 53 includes a monitoring interface to visually observe changes in oxygen and nitrogen concentrations and the control process within the test tank 11.

[0038] In one specific implementation, the programs related to the evacuation operation, the first gas replenishment operation, and the second gas replenishment operation are written into the CPU module of the controller 51, including, for example, logic commands and data points. The monitoring interface can communicate with the controller via a network to acquire, display, issue commands, and store oxygen concentration data, pressure data, and temperature data. The remote control computer 53 communicates with the controller 51 via a network to ensure the efficient and stable operation of the entire system.

[0039] The control unit 50 is electrically connected to the air extraction operation unit 20, the first air replenishment operation unit 30, and the second air replenishment operation unit 40 in the control cabinet to perform air extraction, first air replenishment, and second air replenishment operations to coordinate the control of multiple environmental parameters in the temperature-controlled chamber 10, including gas concentration, pressure, and temperature.

[0040] In this example, the control cabinet integrates key components such as controller 51, airflow controller, nitrogen solenoid valve, and oxygen solenoid valve.

[0041] It should be noted that in other embodiments, the controller 51 may be set independently of the control cabinet. The above is only described as an optional example and should not be construed as a limitation of this application.

[0042] from Figure 1 As can be seen from the diagram, the gas source unit 60 includes a nitrogen cylinder 61 and an oxygen cylinder 62, which are respectively connected to the first gas replenishment operation unit 30 and the second gas replenishment operation unit 40. The connection between the nitrogen cylinder 61, the oxygen cylinder 62 and the control cabinet and the test tank 11, for example, uses corrugated hoses, which can effectively ensure the flexibility and reliability of the entire system.

[0043] The oxygen concentration within the temperature-controlled chamber 10 is controlled by a combination of oxygen-filling and nitrogen-filling solenoid valves. Four filling lines (i.e., four nitrogen-filling lines) are configured, with the first filling line equipped with a flow controller 35. The nitrogen and oxygen source pressures are monitored in real-time by nitrogen and oxygen pressure transmitters on their respective filling lines to help determine the nitrogen and oxygen flow rates to be filled into the temperature-controlled chamber 10.

[0044] It should be noted that in this example, the control cabinet includes two mounting plates: a first mounting plate and a second mounting plate. The first mounting plate integrates control devices such as the PLC, power supply, circuit breaker, and relays. The second mounting plate is used to mount and fix various pipelines for the air charging solenoid valve, oxygen charging solenoid valve, and airflow controller. Considering the different usage scenarios in various field environments, no fixed interfaces are provided on the control cabinet; the air extraction pipeline, air charging pipeline, etc., all pass through the second mounting plate of the cabinet to facilitate quick connection with field pipelines. However, this is not a limitation; the above is only an optional example and should not be construed as a limitation of this application.

[0045] In one specific embodiment, when it is necessary to fill the test tank 11 with nitrogen, the second control valve 34, the nitrogen filling solenoid valve 32, the nitrogen filling solenoid valve corresponding to the multi-way filling pipeline, and the third control valve 9 are opened in sequence to allow nitrogen to be filled into the test tank 11 to adjust the oxygen concentration and / or pressure inside the test tank 11.

[0046] In another embodiment, when it is necessary to fill the test tank 11 with oxygen, the fifth control valve 45, the fourth oxygen filling solenoid valve 43, the oxygen filling solenoid valve corresponding to the multi-way gas filling pipeline, and the third control valve 9 are opened in sequence to allow oxygen to be filled into the test tank 11 and adjust the oxygen concentration in the test tank 11.

[0047] In another embodiment, when the temperature inside the temperature-controlled chamber 10 rises, causing the pressure to increase and the current pressure to exceed the target pressure, an automatic evacuation operation is performed.

[0048] To further improve the response speed of pressure and temperature coupled control and avoid large pressure overshoot caused by drastic temperature fluctuations, the control unit 50 is embedded with a feedforward coupled prediction model based on the ideal gas law.

[0049] In a closed test environment with low pressure and high oxygen, the internal volume V of the temperature-controlled chamber 10 is a constant value. According to the ideal gas law, the pressure, temperature, and amount of gaseous substances within the temperature-controlled chamber satisfy the following thermodynamic coupling formula: Where P is the absolute pressure inside the controllable chamber; V is the effective volume of the controllable chamber; n is the total amount of gaseous matter inside the controllable chamber; R is the ideal gas constant; and T is the absolute temperature inside the controllable chamber.

[0050] During the temperature test profile operation of the thermal cycling test, temperature changes will directly cause positively correlated pressure fluctuations. In this embodiment, the control unit 50 obtains the current absolute temperature in real time (e.g., using...). (representation) and current pressure (e.g., using) (represented), combined with the target absolute temperature for the next control cycle (e.g., using...) (represented), calculating predicted stress without intervention (e.g., using...) express): in, This represents the predicted stress without intervention; This indicates the current pressure as obtained in real time. This indicates the current absolute temperature, which is obtained in real time. This indicates the target absolute temperature for the next control cycle.

[0051] The control unit 50 will calculate the predicted pressure The predicted pressure is compared with the target pressure to obtain the predicted deviation value. When the predicted deviation value exceeds the preset feedforward trigger threshold, the system determines that a pressure exceedance due to temperature is imminent. At this time, the control unit 50 will intervene in advance before the actual pressure deviates from the target range: if the predicted pressure... If the pressure exceeds the target pressure, initiate the evacuation operation ahead of schedule; if the predicted pressure... If the pressure is lower than the target pressure, the gas replenishment operation is initiated in advance. This greatly reduces the pressure fluctuation range of the test environment.

[0052] In another embodiment, when the temperature inside the temperature-controlled chamber drops, causing a decrease in pressure, a first gas replenishment operation and / or a second gas replenishment operation are automatically performed. During the first gas replenishment operation, the second gas replenishment operation, and the gas extraction operation, the oxygen concentration deviation is calculated in real time, and the nitrogen and oxygen replenishment ratio is dynamically adjusted.

[0053] It should be noted that the above is only an optional example and should not be construed as a limitation of this application.

[0054] Compared with existing technologies, this application addresses the real-time monitoring and precise control of pressure and oxygen concentration in complex temperature cycling test environments. This effectively ensures the stability and accuracy of the test environment. The opening of the butterfly valve is automatically adjusted according to the deviation between the current pressure and the target pressure, achieving high-precision pressure and oxygen concentration control. The pressure can be stabilized within a specified range of the target pressure (e.g., within ±1 kPa), and the oxygen concentration can be stabilized within the target oxygen concentration (e.g., within ±3% of the target oxygen concentration), with small and stable fluctuations. This realizes a coupled control system for temperature, pressure, and oxygen concentration, which can provide key technical support for the reliability verification of spacecraft equipment under special environments.

[0055] Furthermore, an oil bath vacuum container was used as the test vessel. By controlling the oil bath temperature and an external vacuum pump, temperature cycling and atmospheric pressure environment simulation were achieved. Simultaneously, coupled control of pressure and oxygen concentration was possible. By adjusting the pumping and replenishment rates, the test pressure and oxygen concentration could be maintained more stably.

[0056] Furthermore, during the experiment, the pressure could be stabilized within the range of 53.5 kPa, and the oxygen concentration could be controlled above 48.6%, with a control accuracy better than 3%. In addition, the system also has an alarm function, supports remote monitoring, and has environmental simulation capabilities covering [missing information]. 45℃~ The temperature range is 80℃.

[0057] In addition, the system structure of this application is compact, and multiple adjustment functions are integrated into one control cabinet, which facilitates free movement and rapid deployment, and improves the adaptability to different tests.

[0058] In addition, the system of this application has the function of automatically controlling pressure and oxygen concentration, and supports automatic alarm, remote control and remote monitoring, which significantly improves the intelligence level of the experiment.

[0059] The following is in conjunction with the appendix Figure 2 Detailed description of optional embodiments of the method of this application.

[0060] Reference Figure 2 This application also provides a multi-parameter simulation control method for thermal cycling test pressure, which adopts the multi-parameter simulation control system for thermal cycling test pressure described in this application.

[0061] The multi-parameter simulation control method for thermal cycling test pressure includes the following steps.

[0062] First, in step S101, the target pressure and target oxygen concentration of the current thermal cycling test are set to establish a simulated test environment.

[0063] Taking the thermal cycling test of a single unit inside the lander compartment as an example, the target pressure (i.e., test pressure) of the thermal cycling test is, for example, 54.5 kPa, and the target oxygen concentration is 55%.

[0064] It should be noted that in other embodiments, the target pressure can be 50 kPa to 100 kPa and the target oxygen concentration can be 1% to 60% for different thermal cycling tests. Taking an oil bath vacuum container as an example, the target temperature can reach... 45℃~ 80℃.

[0065] Specifically, the test specimen is placed on a cold plate in the inner shelf of the test tank to establish a simulated test environment with target temperature, target pressure, and target oxygen concentration for current thermal cycling tests. The current thermal cycling test involves the thermal cycling of a single unit within the lander compartment.

[0066] It should be noted that the multi-parameter simulation control method for thermal cycling test pressure in this application has wide applications and is also suitable for the following low-pressure tests: low-pressure discharge test, low-pressure test, and low-pressure temperature test. The low-pressure test, for example, is a test with a pressure of 0.005 Pa to 85 kPa. The above are merely optional examples and should not be construed as limiting this application.

[0067] Next, in step S102, the pressure and oxygen concentration of the test specimen placed in the temperature-controlled chamber of the simulated test environment are monitored, and the current temperature of the simulated test environment is the target temperature.

[0068] In one specific embodiment, the temperature measurement point of the test specimen is monitored. When the current temperature of the measurement point is equal to the target temperature, the evacuation operation is started, and the fourth control valve 6 is opened to activate automatic pressure control, so that the vacuum gauge measures the pressure inside the test tank. (See details below.) Figure 1 .

[0069] It should be noted that in this embodiment, the test tank is first closed, the pressure inside the test tank is controlled to the target pressure, and then dehumidification is performed. Based on the set target oxygen concentration (e.g., set to 1% oxygen concentration), the oxygen concentration inside the test tank is controlled to the target oxygen concentration before temperature control is performed. The above is only an optional example and should not be construed as a limitation of this application.

[0070] When the current temperature of the temperature measuring point is detected to be greater than or less than the target temperature, the temperature of the bath oil in the shelf interlayer 13 is adjusted by the temperature control component to control the temperature of the control point of the test specimen, so that the temperature in the test tank 11 (specifically the temperature measuring point of the test specimen) reaches the target temperature of the simulated test environment.

[0071] Specifically, a vacuum gauge and an oxygen concentration sensor (specifically an oxygen concentration sensor probe) are used to monitor the pressure and oxygen concentration of the test specimen placed in the temperature-controlled chamber under the simulated test environment, so as to obtain the real-time pressure and real-time oxygen concentration in the temperature-controlled chamber.

[0072] It should be noted that the above are merely optional examples and should not be construed as limiting this application. Next, in step S103, when the temperature inside the temperature-controlled chamber rises, the pressure inside the chamber will rise. When the current pressure inside the temperature-controlled chamber is found to be greater than the target pressure, the pressure is adjusted by determining whether to perform an air extraction operation or an air replenishment operation based on the deviation between the current pressure and the target pressure, so that the current pressure is adjusted to the target pressure. During the pressure adjustment process, when a deviation between the oxygen concentration and the target oxygen concentration is detected, the first air replenishment operation or the second air replenishment operation is initiated.

[0073] In one specific embodiment, during the current thermal cycling test, when the temperature inside the controllable temperature chamber rises, the pressure inside the chamber will rise. When the current pressure inside the controllable temperature chamber is found to be greater than the target pressure, the pressure is adjusted by determining whether to perform an air extraction or air replenishment operation based on the deviation between the current pressure and the target pressure, so that the current pressure is adjusted to the target pressure.

[0074] Specifically, when the deviation between the current pressure and the target pressure is positive, the evacuation operation is determined.

[0075] The pumping operation is performed in stages based on the deviation. Specifically, when the current pressure is greater than the target pressure and the positive deviation is less than the first pressure setting (e.g., 0.2 kPa), the butterfly valve 21 of the pumping pump is opened to 0%. When the current pressure is greater than the target pressure and the positive deviation is greater than or equal to the first pressure setting (e.g., 0.2 kPa), the opening of the butterfly valve 21 of the pumping pump is adjusted to the first opening (e.g., 20%) corresponding to the first pressure setting. When the current pressure is greater than the target pressure, the positive deviation is greater than the second pressure setting (e.g., 0.5 kPa), and the positive deviation is less than the third pressure setting (e.g., 1 kPa), the opening of the butterfly valve 21 of the pumping pump is adjusted to the second opening (e.g., 40%). When the current pressure is greater than the target pressure, and the positive deviation is greater than the third pressure setting (e.g., 1 kPa) and less than the fourth pressure setting (e.g., 1.5 kPa), the opening of the butterfly valve 21 of the pumping pump is adjusted to the third opening (e.g., 60%). When the current pressure is greater than the target pressure, and the positive deviation is greater than the fourth pressure setting (e.g., 1.5 kPa) but less than the fifth pressure setting (e.g., 3 kPa), the opening of the butterfly valve 21 of the air pump is adjusted to the fourth opening (e.g., 80%). When the current pressure is greater than the target pressure, and the positive deviation is greater than the fifth pressure setting (e.g., 3 kPa), the opening of the butterfly valve 21 of the air pump is adjusted to the fifth opening (e.g., 100%).

[0076] When the deviation between the current pressure and the target pressure is negative, a gas replenishment operation is initiated. Specifically, when the current pressure is less than the target pressure (e.g., 54.5 kPa) and the deviation between the current pressure and the target pressure is less than a first specified value (e.g., -200 Pa), a first gas replenishment operation is initiated, causing the flow controller 14 to be in the off state, with an intake flow rate of 0 L / min. When the current pressure is less than the target pressure (e.g., 54.5 kPa) and the deviation between the current pressure and the target pressure is negative, and the deviation is greater than or equal to the first specified value (e.g., -200 Pa), a gas replenishment operation is initiated, causing the flow controller 14 to be closed, with an intake flow rate of 0 L / min. 0.2 kPa), and less than the second specified value (e.g., 0.2 kPa). When the pressure is less than 0.5 kPa, the first air replenishment operation is initiated, and the flow controller 14 is opened, with an intake flow rate of 8 L / min. If the current pressure is less than the target pressure (e.g., 54.5 kPa) or the deviation between the current pressure and the target pressure is greater than or equal to a second specified value (e.g., 0.5 kPa), the first air replenishment operation is initiated. 0.5 kPa), and less than the third specified value (e.g., 0.5 kPa). When the pressure is 1Pa, the first air replenishment operation is determined, and the flow controller 14 is turned on, with the air intake flow rate of the flow controller 14 being 16L / min.

[0077] If the current pressure is less than the target pressure (e.g., 54.5 kPa), and the deviation between the current pressure and the target pressure is greater than or equal to a third specified value (e.g., ... 1 kPa), and less than the fourth specified value (e.g., 1 kPa). When the pressure is 1.5 kPa, the flow controller 14 is in the open state, and the intake flow rate of the flow controller 14 is 24 L / min. When the current pressure is less than the target (e.g., 54.5 kPa), and the deviation between the current pressure and the target pressure is greater than or equal to the fourth specified value (e.g., 1.5 kPa), the flow controller 14 is in the open state, and the intake flow rate of the flow controller 14 is 24 L / min. 1.5 kPa), and less than the fifth specified value (e.g., 1.5 kPa). When the pressure is less than 3 kPa, the flow controller 14 is in the open state, and the intake flow rate of the flow controller 14 is 32 L / min. When the current pressure is less than the target (e.g., 54.5 kPa), or the deviation between the current pressure and the target pressure is greater than or equal to the fifth specified value (e.g., 3 kPa), the flow controller 14 is in the open state, and the intake flow rate of the flow controller 14 is 32 L / min. When the pressure is 3 kPa, the flow controller 14 is in the open state, and the intake flow rate of the flow controller 14 is 40 L / min.

[0078] During pressure adjustment, when the current oxygen concentration is detected to be greater than the target oxygen concentration, and the deviation between the current oxygen concentration and the target oxygen concentration is less than the first concentration setting value (e.g., 1%), a first gas replenishment operation is determined. The first nitrogen filling solenoid valve 36 corresponding to the first filling pipeline is opened to connect any filling pipeline of the first filling operation unit to the temperature-controlled chamber, thereby replenishing nitrogen into the temperature-controlled chamber. For example, the first nitrogen filling solenoid valve 36 is opened, while the second nitrogen filling solenoid valve 37, the third nitrogen filling solenoid valve 38, and the fourth nitrogen filling solenoid valve 39 are in the closed state. When the current oxygen concentration is detected to be greater than the target oxygen concentration, and the deviation between the current oxygen concentration and the target oxygen concentration is greater than or equal to the first concentration setting value (e.g., 1%) and less than the second concentration setting value (e.g., 2%), the first nitrogen filling solenoid valve 36 and the second nitrogen filling solenoid valve 37 are opened, while the third nitrogen filling solenoid valve 38 and the fourth nitrogen filling solenoid valve 39 are in the closed state. When the current oxygen concentration is detected to be greater than the target oxygen concentration, and the deviation between the current oxygen concentration and the target oxygen concentration is greater than or equal to the second concentration setting value (e.g., 2%) and less than the third concentration setting value (e.g., 3%), the first nitrogen-filling solenoid valve 36, the second nitrogen-filling solenoid valve 37, and the third nitrogen-filling solenoid valve 38 are opened, while the fourth nitrogen-filling solenoid valve 39 is closed. When the current oxygen concentration is detected to be greater than the target oxygen concentration, and the deviation between the current oxygen concentration and the target oxygen concentration is greater than or equal to the third concentration setting value (e.g., 3%), the first nitrogen-filling solenoid valve 36, the second nitrogen-filling solenoid valve 37, the third nitrogen-filling solenoid valve 38, and the fourth nitrogen-filling solenoid valve 39 are opened.

[0079] When the current oxygen concentration is detected to be less than or equal to the target oxygen concentration, and the deviation between the current oxygen concentration and the target oxygen concentration is less than the first concentration specified value (e.g., 1%), the second oxygen replenishment operation is determined, and the first oxygen replenishment solenoid valve 46, the second oxygen replenishment solenoid valve 47, and the third oxygen replenishment solenoid valve 48 are all in the closed state.

[0080] When the current oxygen concentration is detected to be less than or equal to the target oxygen concentration (e.g., 55%), and the deviation between the current oxygen concentration and the target oxygen concentration is greater than or equal to the first specified concentration value (e.g., -1%) and less than the second specified concentration value (e.g., -2%), a second oxygen replenishment operation is determined. In this case, the first oxygen replenishment solenoid valve 46 is opened, while the second oxygen replenishment solenoid valve 47 and the third oxygen replenishment solenoid valve 48 are closed. When the current oxygen concentration is detected to be less than or equal to the target oxygen concentration, and the deviation between the current oxygen concentration and the target oxygen concentration is greater than or equal to the second specified concentration value (e.g., -2%) and less than the third specified concentration value (e.g., -3%), a second oxygen replenishment operation is determined. In this case, the first oxygen replenishment solenoid valve 46 and the second oxygen replenishment solenoid valve 47 are opened, while the third oxygen replenishment solenoid valve 48 is closed. When the current oxygen concentration is detected to be less than or equal to the target oxygen concentration, or when the deviation between the current oxygen concentration and the target oxygen concentration is greater than the third specified concentration value (e.g., -3%), the second oxygen replenishment operation is determined. The first oxygen replenishment solenoid valve 46, the second oxygen replenishment solenoid valve 47, and the third oxygen replenishment solenoid valve 48 are opened to replenish oxygen into the temperature-controlled chamber, so that the oxygen concentration replenished into the temperature-controlled chamber is adjusted to the target oxygen concentration.

[0081] Based on the control logic of opening different numbers of air-filling solenoid valves in a stepwise manner according to the deviation, in order to further suppress repeated oscillations during cross-regulation, this system introduces a precise air replenishment calculation model based on Dalton's law of partial pressure in another preferred embodiment.

[0082] In a coupled simulation environment of low pressure and high oxygen, according to Dalton's law of partial pressures, the oxygen concentration inside the controllable chamber is expressed by the following expression: in, Indicates the oxygen concentration inside the controllable cabin; Indicates the partial pressure of oxygen; This indicates the total pressure.

[0083] When the control unit 50 determines to initiate a gas replenishment operation, it first obtains the current total pressure and the current oxygen concentration. Combining this with the target pressure and the target oxygen concentration, taking the second gas replenishment operation (oxygen replenishment) as an example, it calculates the required change in absolute oxygen partial pressure using the following expression: in, This indicates the change in absolute oxygen partial pressure that needs to be replenished; Indicates target pressure; Indicates the target concentration; Indicates current pressure; Indicates the current concentration.

[0084] After determining the required absolute change in oxygen partial pressure, the control unit 50, in conjunction with the real-time intake pressure of the gas source (e.g., a fixed 0.3 MPa), converts it into the target replenishment volumetric flow rate. This is then used to adjust the precise flow rate by regulating the filling pipeline equipped with a flow controller, or to control the total opening area and precise opening duration of the multi-way solenoid valves. This quantitative algorithm resolves the strong coupling interference between pressure and oxygen concentration.

[0085] Specifically, the first gas replenishment operation has a higher priority than the second gas replenishment operation. That is, when there is a difference between the pressure inside the test tank and the target pressure, and also a difference between the oxygen concentration inside the test tank and the target oxygen concentration, the pressure inside the test tank is adjusted first. Once the pressure inside the test tank is adjusted to the target pressure, the oxygen concentration is then adjusted to the target value. In other words, the pressure is adjusted first, then the gas concentration, and the first gas replenishment operation has a higher priority than the second gas replenishment operation.

[0086] Optionally, when the internal temperature of the test tank decreases, causing a pressure drop that makes the current pressure less than the target pressure, a first gas replenishment operation is automatically performed. After the pressure is adjusted back to the target pressure, if the current oxygen concentration is less than the target oxygen concentration, a second gas replenishment operation is automatically performed.

[0087] When the internal temperature of the test tank rises, causing a pressure increase that exceeds the target pressure, a staged evacuation operation is automatically performed. Once the pressure is adjusted back to the target pressure, if the current oxygen concentration is greater than or less than the target oxygen concentration, a first or second gas replenishment operation is automatically performed.

[0088] During pressure adjustment, if the pressure inside the temperature-controlled chamber exceeds the target pressure due to the first or second gas replenishment operation, pressure adjustment is performed first, followed by oxygen concentration control.

[0089] In one specific embodiment, after the pressure and oxygen concentration inside the test tank stabilize at the test pressure and test oxygen concentration, temperature control is activated, and the temperature is set to the initial test temperature (e.g., room temperature). Once the temperature stabilizes at the initial test temperature, the temperature self-adjustment function is activated. After self-adjustment is complete, the test can begin, running the temperature test profile. When the test temperature rises, the pressure inside the test tank will also rise. At this time, the baffle valve in front of the vacuum pump automatically opens, and then the butterfly valve automatically opens at a specific opening degree based on the pressure difference between the current pressure and the target pressure inside the test tank (the correspondence between the pressure difference value and the butterfly valve opening degree is preset and can be changed at any time during the test).

[0090] When a deviation exists between the oxygen concentration and the target oxygen concentration, nitrogen or oxygen is added to adjust the concentration through a first or second gas replenishment operation. When a decrease in test temperature causes a drop in pressure within the test tank, making the current pressure lower than the target pressure, a first gas replenishment operation is automatically performed to add nitrogen. During the first, second, and evacuation operations, the deviation between the current oxygen concentration and the target oxygen concentration within the test tank is calculated in real time. If a deviation exists, nitrogen or oxygen is added through either the first or second gas replenishment operation. This process is regulated by the control unit's controller to simultaneously maintain the pressure and oxygen concentration at the target levels.

[0091] After the temperature test profile is completed, the temperature control, oxygen concentration control, and pressure control are turned off, and the pressure inside the test tank is restored to atmospheric pressure. Then, the door of the test tank is opened to remove the test specimen, thus completing the thermal cycling test.

[0092] In another embodiment, when the target pressure is 54.5 kPa and pressure adjustment is performed, the vacuum pump is turned on to initiate the pressure control process. Initially, the pressure inside the test tank is atmospheric pressure (i.e., 101.325 kPa). Since atmospheric pressure is greater than 54.5 kPa, a vacuum operation is required. First, the opening of the butterfly valve 21 of the vacuum pump is adjusted to 100%. When the pressure inside the test tank drops to 57.5 kPa, the opening of the butterfly valve 21 of the vacuum pump is adjusted to 80%. When the pressure inside the test tank drops to 56.5 kPa, the opening of the butterfly valve 21 of the vacuum pump is adjusted to 60%. When the pressure inside the test tank drops to 56 kPa, the opening of the butterfly valve 21 of the vacuum pump is adjusted to 40%. When the pressure inside the test tank drops to 55.5 kPa, the opening of the butterfly valve 21 of the vacuum pump is adjusted to 20%. When the pressure inside the test tank drops to the target pressure, adjust the opening of the butterfly valve 21 of the vacuum pump to 0%, and use a vacuum gauge to monitor whether the pressure inside the test tank is stable at the target pressure.

[0093] A stepped threshold method is used to achieve rapid, step-like control of the butterfly valve 21 opening (e.g., 20%, 40%, 60%) or the make-up gas flow. To further improve steady-state accuracy and eliminate system jitter caused by step switching, the control unit 50 automatically switches to a dual-closed-loop proportional-integral-derivative (PID) continuous control mode without relying on discrete step control that opens different numbers of solenoid valves, using the configured nitrogen flow controller 35 and oxygen flow controller.

[0094] In the continuous control mode, the control unit 50 takes the current parameter deviation (such as pressure deviation or concentration deviation) as the input, performs real-time calculations using the built-in PID control model, and outputs a continuous dynamic control quantity, expressed by the following expression: in, It represents the continuously dynamic control quantity; e(t) represents the parameter deviation at the current moment (such as pressure deviation or concentration deviation). This is the proportionality coefficient; These are integral coefficients used to eliminate steady-state errors and avoid baseline drift. is the differential coefficient, used to suppress overshoot; t represents the current time t.

[0095] The control unit 50 directly and smoothly drives the butterfly valve 21 in the extraction operation unit 20 to adjust its stepless opening from 0% to 100% using the calculated continuous control quantity u(t). Simultaneously, it smoothly adjusts the inlet flow rate of the corresponding flow controllers in the first and second replenishment operation units 30 and 40. By achieving stepless continuous adjustment throughout the entire path, it avoids drastic changes in pipeline flow resistance and air hammer effects caused by the switching of the solenoid valve matrix during start-up and shutdown. This achieves a smooth transition with control accuracy better than 3% and within a range of ±1 kPa under extremely complex thermal cycling profiles.

[0096] Once the pressure inside the test tank stabilizes at the target pressure and the oxygen concentration stabilizes at 55%, turn on the temperature control and set the temperature to 20℃. After the temperature stabilizes at 20℃, activate the temperature control function to begin the thermal cycling test and run the temperature test profile.

[0097] During the thermal cycling test, if the pressure inside the test tank increases due to temperature rise, causing the current pressure to exceed the target pressure, the pressure is adjusted by determining whether to perform a vacuuming or gas replenishment operation based on the deviation between the current and target pressures, bringing the current pressure back to the target pressure. During pressure adjustment, if a deviation between the oxygen concentration and the target oxygen concentration is detected, the first or second gas replenishment operation is initiated, effectively ensuring that the target pressure and target oxygen concentration are maintained throughout the entire test.

[0098] After the temperature test profile is completed, the temperature control, oxygen concentration control, and pressure control are turned off, and the pressure inside the test tank is restored to atmospheric pressure. Then the door can be opened and the test specimen (such as a single unit inside the lander cabin) can be taken away, thus completing the thermal cycling test.

[0099] In another example, dehumidification is performed before setting the target oxygen concentration.

[0100] Specifically, first set the target pressure. Once the current pressure inside the test tank is controlled within the target pressure range, set the target oxygen concentration (e.g., 1%). Then, while maintaining the target pressure, reduce the oxygen concentration by introducing nitrogen into the test tank, effectively performing a gas replacement. When the oxygen concentration reaches the target concentration, the gas replacement within the test tank is confirmed to be complete. This is because introducing nitrogen causes the current pressure to rise, so nitrogen introduction is paused, and the butterfly valve is opened for evacuation. Once the current pressure is controlled within the target pressure range, nitrogen introduction continues to reduce the oxygen concentration. This alternating process of nitrogen introduction and evacuation continues until the oxygen concentration is reduced to the target concentration, thus completing the dehumidification process. Finally, set the target oxygen concentration to the required experimental concentration to establish the simulated test environment.

[0101] It should be noted that the above is only an optional example and should not be construed as a limitation of this application.

[0102] Compared with existing technologies, this application addresses the real-time monitoring and precise control of pressure and oxygen concentration in complex temperature cycling test environments. This effectively ensures the stability and accuracy of the test environment. The butterfly valve opening is automatically adjusted based on the difference between the current pressure and the target pressure, achieving high-precision pressure and oxygen concentration control. The pressure can be stabilized within a specified range of the target pressure (e.g., ...). Within a range of 1 kPa, the oxygen concentration can be stabilized at the target oxygen concentration (e.g., target oxygen concentration). Within 3% range, with small and stable fluctuations, a coupled control system for temperature, pressure and oxygen concentration has been achieved, which can provide key technical support for the reliability verification of spacecraft equipment in special environments.

[0103] Furthermore, during the experiment, the pressure could be stabilized within the range of 53.5 kPa to 55.5 kPa, and the oxygen concentration could be controlled above 48.6%, with a control accuracy better than 3%. In addition, the system also has an alarm function, supports remote monitoring, and has comprehensive environmental simulation capabilities. 45℃~ The temperature range is 80℃.

Claims

1. A multi-parameter simulation control system for thermal cycling test pressure, characterized in that, include: A temperature-controlled chamber includes a test tank and a shelf compartment inside the test tank. The shelf compartment is used to place the test specimen. The test tank is equipped with a cold plate, a temperature sensor, a vacuum pressure transmitter, and an oxygen concentration sensor probe. A control cabinet is connected to the temperature-controlled chamber, and the control cabinet is equipped with an air extraction operation unit, a first air replenishment operation unit, and a second air replenishment operation unit. The control unit is used to control the air extraction operation unit, the first air replenishment operation unit, and the second air replenishment operation unit in the control cabinet to perform air extraction operation, the first air replenishment operation, and the second air replenishment operation in order to coordinately control multiple environmental parameters inside the temperature-controlled chamber during the thermal cycling test. The environmental parameters include gas concentration, pressure, and temperature. The gas source unit includes a first nitrogen cylinder and an oxygen cylinder, which are respectively connected to the first gas replenishment operation unit and the second gas replenishment operation unit.

2. The multi-parameter simulation control system for thermal cycling test pressure according to claim 1, characterized in that, The air extraction operation unit includes a butterfly valve, a baffle valve, and an air extraction pump. A first control valve is also provided between the butterfly valve of the air extraction operation unit and the test tank.

3. The multi-parameter simulation control system for thermal cycling test pressure according to claim 1, characterized in that, The first gas replenishment operation unit includes a second control valve connected to the gas source unit, a nitrogen pressure transmitter, a nitrogen charging solenoid valve, and multiple gas charging pipelines. Each gas charging pipeline is used for charging nitrogen, and each gas charging pipeline is equipped with a nitrogen charging solenoid valve. The second control valve is used to control the opening or closing of the connection between the first gas replenishment operation unit and the gas source unit.

4. The multi-parameter simulation control system for thermal cycling test pressure according to claim 1, characterized in that, The second gas replenishment operation unit is connected to the gas source unit by a fifth control valve, an oxygen pressure transmitter, an oxygen filling solenoid valve, and multiple gas filling pipelines. Each gas filling pipeline is used to fill oxygen, and each gas filling pipeline is equipped with an oxygen filling solenoid valve.

5. The multi-parameter simulation control system for thermal cycling test pressure according to claim 3 or 4, characterized in that, A third control valve is also provided between the temperature-controlled chamber and the first gas replenishment operation unit. The third control valve is used to control the opening or closing of the first gas replenishment operation and / or the second gas replenishment operation, so that when the temperature inside the temperature-controlled chamber rises and the current pressure inside the temperature-controlled chamber is greater than the target pressure, the control unit determines the evacuation operation or gas replenishment operation based on the deviation between the current pressure and the target pressure to adjust the pressure to the target pressure.

6. The multi-parameter simulation control system for thermal cycling test pressure according to claim 5, characterized in that, During the pressure adjustment process, the changes in oxygen concentration and the pressure difference between the pressure inside the controllable temperature chamber and the target pressure are monitored during the first or second gas replenishment operation. This ensures that when the pressure inside the controllable temperature chamber is greater than the target pressure, pressure adjustment is performed first, followed by oxygen concentration control.

7. The multi-parameter simulation control system for thermal cycling test pressure according to claim 1, characterized in that, The oxygen concentration sensor probe is installed inside the test tank to measure the oxygen concentration inside the test tank.

8. The multi-parameter simulation control system for thermal cycling test pressure according to claim 1, characterized in that, The first flange is used to connect the evacuation operation unit, the fourth control valve and the test tank. The second flange is provided with mounting holes for connecting the oxygen concentration sensor inside the test tank and the oxygen concentration transmitter outside the test tank.

9. A multi-parameter simulation control method for thermal cycling test pressure, characterized in that, It employs a multi-parameter simulation control system for thermal cycling test pressure as described in any one of claims 1 to 8, comprising: Set the target pressure and target oxygen concentration for the current thermal cycling test, and establish a simulated test environment; Pressure and oxygen concentration are monitored on the test specimen placed in the temperature-controlled chamber of the simulated test environment, where the current temperature of the simulated test environment is the target temperature. When the temperature inside the temperature-controlled chamber rises and the current pressure inside the temperature-controlled chamber is greater than the target pressure, the pressure is adjusted by determining whether to perform an air extraction or air replenishment operation based on the deviation between the current pressure and the target pressure, so that the current pressure is adjusted to the target pressure. During the pressure adjustment process, if a deviation between the oxygen concentration and the target oxygen concentration is detected, the first or second air replenishment operation is initiated.

10. The multi-parameter simulation control method for thermal cycling test pressure according to claim 9, characterized in that, During pressure adjustment, if the pressure inside the temperature-controlled chamber exceeds the target pressure due to the first or second gas replenishment operation, pressure adjustment is performed first, followed by oxygen concentration control.

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