Micro-pressure oxygen cabin pressure increasing and decreasing control algorithm

Abstract

The present application is suitable for the technical field of oxygen cabin pressure control, and provides a micro-pressure oxygen cabin pressure increasing and decreasing control algorithm, which comprises the following steps: S1, setting a uniform speed of pressure increasing and decreasing by human, and starting or stopping the program of the air pump and the oxygen generator; S3, after collecting the pressure in the collection cycle time, calculating the average value of the pressure increasing or decreasing; S4, adjusting the exhaust valve opening degree through different collection cycles; and S5, setting the target pressure in the micro-pressure oxygen cabin, so that the pressure in the micro-pressure oxygen cabin reaches the target pressure, thereby, in the pressure increasing stage of the micro-pressure oxygen cabin, the present application compensates the air intake amount attenuation by dynamically closing the exhaust valve, in the pressure decreasing stage, the present application compensates the exhaust efficiency attenuation by dynamically opening the exhaust valve, so that the cabin pressure change rate is stably kept at the ear pressure sensitive critical value set by the user in the whole process; meanwhile, after each treatment course, the feedback coefficient, the feedforward coefficient and the initial opening degree are automatically optimized according to the whole rate, so that the equipment reaches the individual optimal control after being used for many times.

Description

Technical Field

[0001] This invention relates to the field of oxygen chamber pressure control technology, and in particular to a pressure boosting and depressurization control algorithm for a micro-pressure oxygen chamber. Background Technology

[0002] A microbaric oxygen chamber is a device for providing low-pressure oxygen therapy, using a high concentration of oxygen to help users relax both body and mind. Microbaric oxygen chambers have a wide range of applications, primarily for beauty and wellness, relaxation, and fatigue relief. When starting up, the chamber needs to be pressurized and the oxygen concentration increased. During the therapy, the gas concentration and pressure must be kept constant. At the end of the therapy, the pressure must be depressurized before the user exits the chamber.

[0003] During this process, the user uses a mask to inhale oxygen. However, the user should maintain a relaxed state of mind and body while using the microbarotropic oxygen chamber for health care, and it is inconvenient to operate the microbarotropic oxygen chamber. Therefore, it is necessary to automatically operate and control the gas throughout the entire health care process of the microbarotropic oxygen chamber.

[0004] During operation, microbarotropic oxygen chambers require automatic pressure control to prevent drastic pressure fluctuations during pressurization, stabilization, and depressurization, necessitating a certain level of control precision. Current control methods for microbarotropic oxygen chambers primarily utilize PID control. However, with PID control, the different rates of pressurization and depressurization can easily exceed the human ear pressure sensitivity threshold, affecting patient comfort.

[0005] In conclusion, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Summary of the Invention

[0006] To address the aforementioned shortcomings, the present invention aims to provide a micro-pressure oxygen chamber pressurization and depressurization control algorithm. This algorithm compensates for the decrease in air intake by dynamically closing the exhaust valve during the pressurization phase and for the decrease in exhaust efficiency by dynamically opening the exhaust valve during the depressurization phase. This ensures that the chamber pressure change rate remains stable near the user-set ear pressure sensitivity threshold m (i.e., the manually set uniform pressure adjustment speed), achieving uniform, controllable, and imperceptible pressurization and depressurization. Simultaneously, after each treatment session, the feedback coefficient, feedforward coefficient, and initial opening are automatically optimized based on the root mean square error of the overall rate, allowing the device to achieve personalized optimal control after multiple uses. This ensures comfort while completing pressurization and depressurization in the shortest possible time, significantly improving the oxygen therapy experience for different groups.

[0007] To achieve the above objectives, this invention provides a pressurization control algorithm for a micro-pressure oxygen chamber. The micro-pressure oxygen chamber includes an air pump for supplying gas to the interior and an oxygen generator. The micro-pressure oxygen chamber is equipped with an exhaust valve and a controller for controlling the opening degree of the exhaust valve. The pressurization control algorithm includes the following steps:

[0008] S1. By manually setting the uniform pressure adjustment speed m, and starting the air pump and oxygen generator, the exhaust valve opening is set to the initial pressure increase opening a. The j-th pressure sampling cycle, j=1, 2, 3…n, where initially j=1, and a1… ， =a;

[0009] S2. Collect the pressure values ​​inside the micro-pressure oxygen chamber within the period δt and add them to the pressure sequence. jδt Inside, denoted as P jδt ={P j1 P j2 P j3 P j4 ..., P jδt};

[0010] S3. After collecting the pressure within the collection period δt, calculate the average pressure rise upAvg(P). jδt The average pressure rise is upAvg (P) jδt Add to the average series of rising pressure PS upAvg In the middle, PS upAvg ={upAvg(P 1δt ), upAvg(P 2δt ), upAvg(P 3δt ), ..., upAvg(P jδt )};

[0011] S4. By adjusting the opening degree of the exhaust valve within the sampling period δt for different numbers of times, the opening degree of the exhaust valve in each period is added to the exhaust valve opening degree adjustment sequence as, and the controller controls the exhaust valve to perform the adjustment action. Then the controller waits for the sampling period δt and executes steps S2 and S3 synchronously until the pressure boosting step ends.

[0012] S5. Set the target pressure P inside the micro-pressure oxygen chamber. w When the pressure inside the micro-pressure oxygen chamber reaches the target pressure, the pressurization phase ends, and the final average pressure rise sequence PS is obtained. upAvg ={upAvg(P 1δt ), upAvg(P 2δt ), upAvg(P 3δt ), ..., upAvg(P nδt )}, optimize and adjust the initial opening degree of the micro-pressure oxygen chamber for pressurization.

[0013] In one embodiment, in step S3, the average pressure rise is... :

[0014] ;

[0015] In step S4,

[0016] When j=1, as={a1} ，};

[0017] Otherwise, calculate the opening degree of the electric exhaust valve as a. j ， and a j ， Add it to the electric exhaust valve pressure boosting opening adjustment sequence, denoted as as={a1} ， a2 ， a3 ， , ..., a j ，}, Set the exhaust valve opening to a j-1 =a j ， And perform the adjustment action.

[0018] In one embodiment, the formula for calculating the exhaust valve opening is... ;

[0019] Where λ and ρ are the boost opening adjustment coefficients, a is the initial boost opening degree, and (α,β) is the error tolerance range.

[0020] In one embodiment, in step S5, the sequence PS is... upAvg Calculate its root mean square error, denoted as β. RMSE The calculation formula is as follows:

[0021] ;

[0022] Where m is the manually set uniform pressure regulation speed.

[0023] In one embodiment, the boost opening adjustment coefficient λ, ρ and the initial boost opening a are adjusted, wherein:

[0024] λ=ηλ, when β RMSE >ω;

[0025] ρ=ρ+μβ RMSE / m, when β RMSE ≥θ;

[0026] a = (a2) ， +a3 ， In practical applications, η, μ, ω, and θ are empirical values, and m is a manually set uniform pressure regulation speed.

[0027] This requires θ < ω, if the root mean square error β RMSEIf ∈[θ,ω], then only a small adjustment is needed to the opening value of the electric exhaust valve, that is, only the pressure boosting opening adjustment coefficient ρ needs to be adjusted;

[0028] If the root mean square error β RMSE If the value exceeds the threshold, it means that the opening value of the electric exhaust valve needs to be adjusted significantly. Here, not only the pressure increase opening adjustment coefficient ρ needs to be adjusted, but also the pressure increase opening adjustment coefficient λ needs to be adjusted.

[0029] This invention also provides a depressurization control algorithm for a micro-pressure oxygen chamber, comprising the following steps:

[0030] S1. By manually setting a uniform depressurization rate m, and turning off the air pump and oxygen generator, the exhaust valve opening is set to the initial depressurization opening φ. In the j-th pressure sampling cycle, j = 1, 2, 3...n, where initially j = 1, and φ1... ， =φ;

[0031] S2. Collect the pressure values ​​inside the micro-pressure oxygen chamber within the period δt and add them to the pressure sequence. j_δt Inside, denoted as P j_δt ={P j_1 P j_2 P j_3 P j_4 ..., P j_δt};

[0032] S3. After collecting pressure within the acquisition period δt, calculate the average pressure drop value downAvg(P). j_δt The average pressure drop (downAvg, P) will be calculated. j_δt Add to the average pressure drop sequence PS downAvg In the middle, PS downAvg ={downAvg(P 1_δt ), downAvg(P 2_δt ), downAvg(P 3_δt ), ..., downAvg(P j_δt )};

[0033] S4. By adjusting the exhaust valve opening within different sampling periods δt, the exhaust valve opening in each period is added to the exhaust valve opening adjustment sequence φ. ， In the middle, the controller controls the exhaust valve to perform adjustment action, and then the controller waits for the acquisition period δt time, and synchronously executes steps S2 and S3 until the pressure reduction step is completed;

[0034] S5. Set the target pressure P inside the micro-pressure oxygen chamber. w When the pressure inside the micro-pressure oxygen chamber reaches the target pressure, the depressurization phase ends, and the final average pressure drop sequence PS is obtained.downAvg ={downAvg(P 1_δt ), downAvg(P 2_δt ), downAvg(P 3_δt ), ..., downAvg(P n_δt )}, optimize and adjust the initial opening degree of the depressurization of the micro-pressure oxygen chamber.

[0035] In one embodiment, in step S3, the average pressure drop... :

[0036] ;

[0037] In step S4,

[0038] When j=1, φ ， ={φ1 ，};

[0039] Otherwise, calculate the opening degree of the electric exhaust valve as φ. j ， and φ j ， Add to the electric exhaust valve pressure reduction opening adjustment sequence, denoted as φ. ， ={φ1 ， φ2 ， φ3 ， , ..., φ j ，}, Set the exhaust valve opening to φ j-1 =φ j ， And perform the adjustment action.

[0040] In one embodiment, the formula for calculating the exhaust valve opening is... ;

[0041] Where a and b are the voltage reduction opening adjustment coefficients, φ is the initial voltage reduction opening degree, and (d,e) is the error tolerance range.

[0042] In one embodiment, in step S5, the sequence PS is... downAvg Calculate its root mean square error, denoted as β. d_RMSE The calculation formula is as follows:

[0043] ;

[0044] Where m is the manually set uniform pressure regulation speed.

[0045] In one embodiment, the voltage reduction opening adjustment coefficients a and b, and the initial voltage reduction opening φ are adjusted, wherein:

[0046] a = ka, when β d_RMSE > ω;

[0047] b = b + πβ d_RMSE / m, when β d_RMSE ≥ θ;

[0048] φ = (φ2 ， + φ3 ， ) / 2, where k, d, e, and π are empirical values in practical applications, and m is the artificially set constant pressure regulation speed;

[0049] Here, it is required that d < e. If the root mean square error β d_RMSE ∈ [θ, ω], then only a small adjustment of the opening value of the electric exhaust valve is required, that is, only the pressure reduction opening adjustment coefficient b is adjusted;

[0050] If the root mean square error β d_RMSE exceeds the threshold value, it means that a large adjustment of the opening value of the electric exhaust valve is required. Here, not only the pressure reduction opening adjustment coefficient b needs to be adjusted, but also the pressure reduction opening adjustment coefficient a needs to be adjusted.

[0051] In summary, the technical effects produced by the present invention are as follows:

[0052] 1. During the pressurization stage of the micro-pressure oxygen chamber, the intake air volume attenuation is compensated by dynamically closing the exhaust valve, and during the pressure reduction stage, the exhaust efficiency attenuation is compensated by dynamically opening the exhaust valve, so that the cabin pressure change rate is stably maintained near the ear pressure sensitivity critical value m set by the user throughout the process, realizing uniform, controllable, and imperceptible pressure increase and decrease;

[0053] 2. After each treatment course, the feedback coefficient, feedforward coefficient, and initial opening are automatically optimized according to the root mean square error of the whole process rate, so that the equipment reaches personalized optimal control after multiple uses, and the pressure increase and decrease are completed in the shortest time while ensuring comfort, significantly improving the oxygen therapy experience of different people. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 is a schematic diagram of the control process during the pressurization stage of the present invention;

[0055] Figure 2 is a schematic diagram of the control process during the pressure reduction stage of the present invention;

[0056] Figure 3 is a schematic diagram of the pressure parameter during the pressurization cycle of the comparative experiment;

[0057] Figure 4 is a schematic diagram of the pressure parameter during the pressure reduction cycle of the comparative experiment;

[0058] Figure 5 is a schematic diagram of the pressure parameter during the pressurization cycle of the present invention;

[0059] Figure 6 This is a schematic diagram of the pressure parameters during the pressure reduction cycle of the present invention. Detailed Implementation

[0060] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0061] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0062] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0063] See Figure 1 This invention provides a pressurization control algorithm for a micro-pressure oxygen chamber. The algorithm includes an air pump and an oxygen generator that supply gas to the chamber. The chamber is equipped with an exhaust valve and a controller that controls the valve's opening. The controller can be a PLC or similar control module. To ensure precise control of the chamber, the exhaust valve can be a motor-driven exhaust valve, using a servo motor to ensure accurate control of its opening. The controller is connected to the servo motor, controlling its movement. The air pump and oxygen generator are also connected to the controller, which controls their opening and closing (existing technology, not described further). The pressurization control algorithm includes the following steps:

[0064] S1. By manually setting the uniform pressure adjustment speed m, and starting the air pump and oxygen generator, the exhaust valve opening is set to the initial pressure increase opening a. The j-th pressure sampling cycle, j=1, 2, 3…n, where initially j=1, and a1… ， =a;

[0065] S2. Collect the pressure values ​​inside the micro-pressure oxygen chamber within the period δt and add them to the pressure sequence. jδt Inside, denoted as P jδt ={P j1 P j2 P j3 P j4 ..., P jδt};

[0066] S3. After collecting the pressure within the collection period δt, calculate the average pressure rise upAvg(P). jδt The average pressure rise is upAvg (P) jδt Add to the average series of rising pressure PS upAvg In the middle, PS upAvg ={upAvg(P 1δt ), upAvg(P 2δt ), upAvg(P 3δt ), ..., upAvg(P jδt )};

[0067] S4. By adjusting the opening degree of the exhaust valve within the sampling period δt for different numbers of times, the opening degree of the exhaust valve in each period is added to the exhaust valve opening degree adjustment sequence as, and the controller controls the exhaust valve to perform the adjustment action. Then the controller waits for the sampling period δt and executes steps S2 and S3 synchronously until the pressure boosting step ends.

[0068] S5. Set the target pressure P inside the micro-pressure oxygen chamber. w When the pressure inside the micro-pressure oxygen chamber reaches the target pressure, the pressurization phase ends, and the final average pressure rise sequence PS is obtained. upAvg ={upAvg(P 1δt ), upAvg(P 2δt ), upAvg(P 3δt ), ..., upAvg(P nδt )}, optimize and adjust the initial opening degree of the micro-pressure oxygen chamber for pressurization.

[0069] In one embodiment, in step S3, the average pressure rise is... :

[0070] ;

[0071] Meanwhile, in step S4,

[0072] When j=1, as={a1} ，};

[0073] Otherwise, calculate the opening degree of the electric exhaust valve as a. j ， and a j ， Add it to the electric exhaust valve pressure boosting opening adjustment sequence, denoted as as={a1} ， a2 ， a3 ， , ..., a j ，}, Set the exhaust valve opening to a j-1 =a j ， It also performs adjustment actions to ensure that the opening of the exhaust valve can be accurately adjusted effectively.

[0074] Among them, the formula for calculating the opening degree of the exhaust valve is as follows. ;

[0075] Where λ and ρ are the boost opening adjustment coefficients, a is the initial boost opening degree, and (α,β) is the error tolerance range.

[0076] In one embodiment, in step S5, the sequence PS is... upAvg Calculate its root mean square error, denoted as β. RMSE The calculation formula is as follows:

[0077] ;

[0078] Where m is the manually set uniform pressure regulation speed.

[0079] In one embodiment, the boost opening adjustment coefficient λ, ρ and the initial boost opening a are adjusted, wherein:

[0080] λ=ηλ, when β RMSE >ω;

[0081] ρ=ρ+μβ RMSE / m, when β RMSE ≥θ;

[0082] a = (a2) ， +a3 ， In practical applications, η, μ, ω, and θ are empirical values, and m is a manually set uniform pressure regulation speed.

[0083] This requires θ < ω, if the root mean square error β RMSEIf ∈[θ,ω], then only a small adjustment is needed to the opening value of the electric exhaust valve, that is, only the pressure boosting opening adjustment coefficient ρ needs to be adjusted;

[0084] If the root mean square error β RMSE If the value exceeds the threshold, it means that the opening value of the electric exhaust valve needs to be adjusted significantly. Here, not only the pressure increase opening adjustment coefficient ρ needs to be adjusted, but also the pressure increase opening adjustment coefficient λ needs to be adjusted.

[0085] See Figure 2 The present invention also provides a depressurization control algorithm for a micro-pressure oxygen chamber, comprising the following steps:

[0086] S1. By manually setting a uniform depressurization rate m, and turning off the air pump and oxygen generator, the exhaust valve opening is set to the initial depressurization opening φ. In the j-th pressure sampling cycle, j = 1, 2, 3...n, where initially j = 1, and φ1... ， =φ;

[0087] S2. Collect the pressure values ​​inside the micro-pressure oxygen chamber within the period δt and add them to the pressure sequence. j_δt Inside, denoted as P j_δt ={P j_1 P j_2 P j_3 P j_4 ..., P j_δt};

[0088] S3. After collecting pressure within the acquisition period δt, calculate the average pressure drop value downAvg(P). j_δt The average pressure drop (downAvg, P) will be calculated. j_δt Add to the average pressure drop sequence PS downAvg In the middle, PS downAvg ={downAvg(P 1_δt ), downAvg(P 2_δt ), downAvg(P 3_δt ), ..., downAvg(P j_δt )};

[0089] S4. By adjusting the exhaust valve opening within different sampling periods δt, the exhaust valve opening in each period is added to the exhaust valve opening adjustment sequence φ. ， In the middle, the controller controls the exhaust valve to perform adjustment action, and then the controller waits for the acquisition period δt time, and synchronously executes steps S2 and S3 until the pressure reduction step is completed;

[0090] S5. Set the target pressure P inside the micro-pressure oxygen chamber. wWhen the pressure inside the micro-pressure oxygen chamber reaches the target pressure, the depressurization phase ends, and the final average pressure drop sequence PS is obtained. downAvg ={downAvg(P 1_δt ), downAvg(P 2_δt ), downAvg(P 3_δt ), ..., downAvg(P n_δt )}, optimize and adjust the initial opening degree of the depressurization of the micro-pressure oxygen chamber.

[0091] In one embodiment, in step S3, the average pressure drop... :

[0092] ;

[0093] In step S4,

[0094] When j=1, φ ， ={φ1 ，};

[0095] Otherwise, calculate the opening degree of the electric exhaust valve as φ. j ， and φ j ， Add to the electric exhaust valve pressure reduction opening adjustment sequence, denoted as φ. ， ={φ1 ， φ2 ， φ3 ， , ..., φ j ，}, Set the exhaust valve opening to φ j-1 =φ j ， And perform the adjustment action.

[0096] In one embodiment, the formula for calculating the exhaust valve opening is... ;

[0097] Where a and b are the voltage reduction opening adjustment coefficients, φ is the initial voltage reduction opening degree, and (d,e) is the error tolerance range.

[0098] In one embodiment, in step S5, the sequence PS is... downAvg Calculate its root mean square error, denoted as β. d_RMSE The calculation formula is as follows:

[0099] ;

[0100] Where m is the manually set uniform pressure regulation speed.

[0101] In one embodiment, through adjustment, the step-down opening adjustment coefficients a, b and the step-down initial opening φ are adjusted, where:

[0102] a = ka, when β d_RMSE > ω;

[0103] b = b + πβ d_RMSE / m, when β d_RMSE ≥ θ;

[0104] φ = (φ2 ， + φ3 ， ) / 2, where k, d, e, π are empirical values in practical applications, and m is the uniformly set pressure regulation speed;

[0105] Here, it is required that d < e. If the root mean square error β d_RMSE ∈ [θ, ω], then only a small adjustment of the opening value of the electric exhaust valve is required, that is, only the step-down opening adjustment coefficient b is adjusted;

[0106] If the value of the root mean square error β d_RMSE exceeds the threshold, it means that a large adjustment of the opening value of the electric exhaust valve is required. Here, not only the step-down opening adjustment coefficient b needs to be adjusted, but also the step-down opening adjustment coefficient a needs to be adjusted.

[0107] To sum up, combined with Figures 3 to 6 , in the pressure boost stage, the power of the air pump and the oxygen generator itself remains constant. As the pressure in the cabin gradually increases, the intake volume of the cabin per unit time will decrease. If the opening of the electric exhaust valve remains unchanged at this time, it will cause the pressure in the cabin to rise relatively fast in the early stage of pressure boost and relatively slowly in the later stage. Therefore, during the pressure boost process, we need to have a gradually decreasing process for the opening of the electric exhaust valve to gradually reduce the exhaust volume of the cabin and thus maintain a uniform pressure boost process. Since the value of the ear pressure critical value m (i.e., the uniformly set pressure regulation speed) can be freely set (generally speaking, due to individual physical differences, the m value of each person will be slightly different), the advantage of freely setting is that this critical value is different for different people. By selecting different critical values for different people, the algorithm can adapt to all people, increasing the universality of the algorithm. As can be clearly seen from the pressure difference compared with the comparative example, the smoothness of the pressure difference increases, which can effectively reduce the ear discomfort caused by the pressure difference change and improve the comfort of the users.

[0108] During the depressurization phase, the cabin pressure is also periodically collected. To ensure that the cabin pressure drops to the target pressure (which is zero kPa in practical applications) in the shortest possible time without the human body feeling any pressure change, unlike the pressurization process, the air pump and oxygen generator do not work during the depressurization process. Therefore, the air intake in the cabin is always zero during this process. As long as the cabin pressure is higher than the external pressure and the electric exhaust valve is not open to zero, the gas in the cabin will always be discharged to the outside, and the cabin pressure will definitely show a downward trend until the cabin pressure equals the external pressure. Assuming the electric exhaust valve remains open throughout the process, the amount of air vented per unit time will gradually decrease as the cabin pressure decreases. This results in a rapid pressure drop in the early stages of depressurization followed by a slower drop in the later stages, contradicting our pre-set goal of uniform depressurization. Therefore, during depressurization, the opening of the electric exhaust valve should gradually increase to proportionally increase the amount of air vented, thus maintaining uniform depressurization. Through comparative analysis, it is evident that the algorithm in this application can maintain a basically constant pressure drop rate, significantly outperforming the comparative method and making substantial progress in improving user comfort (avoiding ear pressure discomfort).

[0109] Of course, the present invention may have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications should all fall within the protection scope of the appended claims.

Claims

1. A pressurization control algorithm for a micro-pressure oxygen chamber, the micro-pressure oxygen chamber comprising an air pump for supplying gas to the interior of the chamber and an oxygen generator, the micro-pressure oxygen chamber being equipped with an exhaust valve, and a controller for controlling the opening degree of the exhaust valve, characterized in that, The boost control algorithm includes the following steps: S1. By manually setting the uniform pressure adjustment speed m, and starting the air pump and oxygen generator, the exhaust valve opening is set to the initial pressure increase opening a. The j-th pressure sampling cycle, j=1, 2, 3…n, where initially j=1, and a1… ， =a, where a1 ， This is the first adjustment value in the electric exhaust valve pressure boosting opening adjustment sequence; S2. Collect the pressure values ​​inside the micro-pressure oxygen chamber within the period δt and add them to the pressure sequence P. jδt Inside, denoted as P jδt ={P j1 P j2 P j3 P j4 ..., P jδt }; S3. After collecting the pressure within the collection period δt, calculate the average pressure rise upAvg(P). jδt The average pressure rise is upAvg (P) jδt Add to the average series of pressure rise PS upAvg In the middle, PS upAvg ={upAvg(P 1δt ), upAvg(P 2δt ), upAvg(P 3δt ), ..., upAvg(P jδt )}; S4. By adjusting the exhaust valve opening within different acquisition cycles δt, the exhaust valve opening for each cycle is added to the exhaust valve opening adjustment sequence as. The controller then controls the exhaust valve to perform the adjustment action. The controller waits for the acquisition cycle δt and simultaneously executes steps S2 and S3 to set the target pressure P inside the micro-pressure oxygen chamber. w The pressurization phase ends when the pressure inside the micro-pressure oxygen chamber reaches the target pressure. S5. After the pressure rise phase ends, the final average pressure rise sequence PS is obtained. upAvg ={upAvg(P 1δt ), upAvg(P 2δt ), upAvg(P 3δt ), ..., upAvg(P nδt )}, optimize and adjust the initial pressurization opening of the micro-pressure oxygen chamber. By adjusting the pressurization opening adjustment coefficients λ, ρ and the initial pressurization opening a, the following adjustments are made: λ=ηλ, when β RMSE >oh; p=p+μβ RMSE / m, when β RMSE ≥θ; a = (a2) ， +a3 ， In practical applications, η, μ, ω, and θ are empirical values, and m is a manually set uniform pressure regulation speed. At this point, θ < ω, if the root mean square error β RMSE If ∈[θ,ω], then the opening value of the electric exhaust valve is adjusted slightly, that is, only the pressure boosting opening adjustment coefficient ρ is adjusted; If the root mean square error β RMSE If the value exceeds the threshold, the opening value of the electric exhaust valve needs to be adjusted significantly, and the pressure boosting opening adjustment coefficient ρ and the pressure boosting opening adjustment coefficient λ need to be adjusted.

2. The micro-pressure oxygen chamber pressurization control algorithm according to claim 1, characterized in that, In step S3, the average pressure rise : ； In step S4, When j=1, as={a1} ， }; Otherwise, calculate the opening degree of the electric exhaust valve as a. j ， and a j ， Add it to the electric exhaust valve pressure boosting opening adjustment sequence, denoted as as={a1} ， a2 ， a3 ， , ..., a j ， }, set the exhaust valve opening to a j-1 =a j ， And perform the adjustment action.

3. The micro-pressure oxygen chamber pressurization control algorithm according to claim 2, characterized in that, in, Formula for calculating exhaust valve opening ； Where λ and ρ are the boost opening adjustment coefficients, a is the initial boost opening degree, and (α,β) is the error tolerance range.

4. The micro-pressure oxygen chamber pressurization control algorithm according to claim 3, characterized in that, In step S5, the sequence PS is... upAvg Calculate its root mean square error, denoted as β. RMSE The calculation formula is as follows: ； Where m is the manually set uniform pressure regulation speed.

5. A depressurization control algorithm for a micro-pressure oxygen chamber, characterized in that, Includes the following steps: S1. By manually setting a uniform depressurization rate m, and turning off the air pump and oxygen generator, the exhaust valve opening is set to the initial depressurization opening φ. In the j-th pressure sampling cycle, j = 1, 2, 3...n, where initially j = 1, and φ1... ， =φ, which is the first adjustment value in the electric exhaust valve pressure reduction opening adjustment sequence; S2. Collect the pressure values ​​inside the micro-pressure oxygen chamber within the period δt and add them to the pressure sequence P. j_δt Inside, denoted as P j_δt ={P j_1 P j_2 P j_3 P j_4 ..., P j_δt }; S3. After collecting pressure within the acquisition period δt, calculate the average pressure drop value downAvg(P). j_δt The average pressure drop (downAvg, P) will be calculated. j_δt Add to the average pressure drop sequence PS downAvg In the middle, PS downAvg ={downAvg(P 1_δt ), downAvg(P 2_δt ), downAvg(P 3_δt ), ..., downAvg(P j_δt )}; S4. By adjusting the exhaust valve opening within different sampling periods δt, the exhaust valve opening in each period is added to the exhaust valve opening adjustment sequence φ. ， In the middle, the controller controls the exhaust valve to perform adjustment actions, and then the controller waits for the acquisition period δt time, and simultaneously executes steps S2 and S3 to set the target pressure P in the micro-pressure oxygen chamber. w The depressurization phase ends when the pressure inside the micro-pressure oxygen chamber reaches the target pressure. S5. At the end of the pressure reduction phase, obtain the final average pressure drop sequence PS. downAvg ={downAvg(P 1_δt ), downAvg(P 2_δt ), downAvg(P 3_δt ), ..., downAvg(P n_δt )}, optimize and adjust the initial depressurization opening of the micro-pressure oxygen chamber, adjusting the depressurization opening adjustment coefficients a and b and the initial depressurization opening φ, where: a=ka, β d_RMSE >ω; b=b+pb d_RMSE / m, when β d_RMSE ≥θ; φ=(φ2 ， +φ3 ， ) / 2, k, d, e, π are empirical values ​​in practical applications, and m is a human-set uniform pressure regulation speed; At this time, d < e. If the root mean square error β d_RMSE ∈[θ, ω], then slightly adjust the opening value of the electric exhaust valve, that is, only adjust the pressure reduction opening adjustment coefficient b; If the root mean square error β d_RMSE If the value exceeds the threshold, the opening value of the electric exhaust valve will be adjusted significantly, and the pressure reduction opening adjustment coefficient b and the pressure reduction opening adjustment coefficient a will be adjusted accordingly.

6. The depressurization control algorithm for a micro-pressure oxygen chamber according to claim 5, characterized in that, In step S3, the average pressure drop : ； In step S4, When j=1, φ ， ={φ1 ， }; Otherwise, calculate the opening degree of the electric exhaust valve as φ. j ， and φ j ， Add to the electric exhaust valve pressure reduction opening adjustment sequence, denoted as φ. ， ={φ1 ， φ2 ， φ3 ， , ..., φ j ， }, Set the exhaust valve opening to φ j-1 =φ j ， And perform the adjustment action.

7. The depressurization control algorithm for a micro-pressure oxygen chamber according to claim 6, characterized in that, in, Formula for calculating the opening degree of the exhaust valve: ； Where a and b are the voltage reduction opening adjustment coefficients, φ is the initial voltage reduction opening degree, and (d,e) is the error tolerance range.

8. The depressurization control algorithm for a micro-pressure oxygen chamber according to claim 7, characterized in that, In step S5, the sequence PS is... downAvg Calculate its root mean square error, denoted as β. d_RMSE The calculation formula is as follows: ； Where m is the manually set uniform pressure regulation speed.

Images