An intelligent control system for gas medical equipment

Abstract

The present invention discloses an intelligent control system for gas medical equipment, which relates to the field of medical equipment control technology. The control system comprises a data acquisition module for acquiring oxygen chamber service environment parameters, wherein the oxygen chamber service environment parameters include the actual air pressure value of the oxygen chamber, the air leakage rate of the oxygen chamber pipeline and the internal temperature value of the oxygen chamber; a dynamic modeling module for constructing a field variable matrix based on the oxygen chamber service environment parameters and outputting a dynamic viscosity correction parameter; a stability evaluation module for calculating the actual oxygen supply resistance value by using the dynamic viscosity correction parameter, and generating an oxygen flow deviation index in combination with the target oxygen supply resistance value and the actual oxygen flow rate to evaluate the oxygen supply stability; a closed-loop compensation module for executing a dual-channel compensation strategy according to the oxygen flow deviation index, outputting an air pressure compensation value and an air leakage compensation value, and then compensating the actual oxygen supply resistance value, and feeding back the compensated actual oxygen supply resistance value to the dynamic modeling module for dynamically adjusting the calculation formula of the dynamic viscosity correction parameter, thereby realizing precise control of the oxygen supply stability.

Description

Technical Field

[0001] The present invention relates to the technical field of medical equipment control, and in particular to an intelligent control system for gas medical equipment. Background Art

[0002] During treatment in a hyperbaric oxygen chamber, oxygen viscosity is nonlinearly affected by factors such as air pressure, temperature, and pipeline leakage, which can easily cause oxygen supply resistance and flow rate to deviate from the target range. Traditional control systems find it difficult to dynamically compensate for multi-source interference in real time. This embodiment achieves precise control of oxygen supply stability by constructing a closed-loop link of "data acquisition-modeling-evaluation-compensation-iteration". Summary of the Invention

[0003] The purpose of the present invention is to provide an intelligent control system for gas medical equipment, which solves the problems existing in the background technology.

[0004] To solve the above technical problems, the present invention provides an intelligent control system for gas medical equipment, comprising:

[0005] The data acquisition module is used to obtain the oxygen chamber service environment parameters, including the actual oxygen chamber pressure value, the oxygen chamber pipeline leakage rate, the oxygen chamber internal temperature value and the actual oxygen flow rate;

[0006] Dynamic modeling module, used to construct field variable matrix based on oxygen chamber service environment parameters and output dynamic viscosity correction parameters;

[0007] A stability evaluation module is used to calculate the actual oxygen supply resistance value using the dynamic viscosity correction parameter, and generate an oxygen flow deviation index by combining the preset target oxygen supply resistance value and the actual oxygen flow rate;

[0008] The closed-loop compensation module is used to execute a dual-channel compensation strategy based on the oxygen flow deviation index, output an air pressure compensation value and an air leakage compensation value, and then compensate the actual oxygen supply resistance value. The compensated actual oxygen supply resistance value is fed back to the dynamic modeling module to dynamically adjust the calculation formula of the dynamic viscosity correction parameter;

[0009] The closed-loop compensation module includes an air pressure compensation channel and an air leakage compensation channel:

[0010] The air pressure compensation channel controls the opening of the air pressure servo valve group of the air supply main pipeline, and adjusts the opening of the pressure valve at the air inlet end of the oxygen chamber according to the air pressure compensation value;

[0011] The leakage compensation channel acts on the pipeline sealing adjustment mechanism, and drives the seal to compensate for the leakage rate according to the leakage compensation value.

[0012] Preferably, the data acquisition module includes:

[0013] The pressure sensing unit is installed at the air inlet and outlet of the oxygen chamber's main air supply pipe, and collects the actual air pressure value of the oxygen chamber in real time through the pressure differential transmitter;

[0014] The flow monitoring unit uses an ultrasonic leak detector to locate the leak point of the oxygen chamber pipeline based on the time difference method and calculates the leakage rate of the oxygen chamber pipeline using the Bernoulli equation;

[0015] The temperature acquisition unit includes a thermocouple array distributed in the oxygen chamber interlayer and the oxygen supply pipeline insulation layer, which obtains the internal temperature value of the oxygen chamber and the temperature gradient of the pipeline wall according to the preset sampling period;

[0016] Among them, the output signals of the pressure sensing unit, flow monitoring unit and temperature acquisition unit are all converted into environmental parameters including time stamps through the analog-to-digital conversion module and input into the dynamic modeling module.

[0017] Preferably, the dynamic modeling module includes:

[0018] The multi-field data fusion unit is used to convert the actual oxygen chamber pressure value, oxygen chamber pipeline leakage rate, oxygen chamber internal temperature value and pipeline wall temperature gradient into a dimensionless field variable matrix;

[0019] The viscosity correction calculation unit is used to perform the following calculation operations based on the field variable matrix:

[0020] (a) Extracting temperature gradient data from the field variable matrix and generating temperature correction coefficients using the temperature-viscosity relationship model;

[0021] (b) Extracting air pressure data from the field variable matrix and obtaining the air pressure influence factor based on the mapping relationship between air pressure and gas density;

[0022] (c) Extract the oxygen chamber pipeline leakage rate from the field variable matrix, combine the temperature correction coefficient and air pressure influence factor, and calculate the dynamic viscosity correction parameter through the weighted model :

[0023] ;

[0024] in is the standard oxygen viscosity, is the oxygen chamber material-gas coupling coefficient, is the maximum allowable leakage rate of the oxygen chamber; : The actual air pressure value of the oxygen chamber is collected in real time through the pressure difference sensor, Q leak : The leakage rate of the oxygen chamber pipeline is calculated by an ultrasonic leak detector. : The internal temperature of the oxygen chamber is collected through the thermocouple array. is standard atmospheric pressure, is the standard temperature;

[0025] The dynamic viscosity correction parameter is synchronously input into the stability evaluation module and the closed-loop compensation module.

[0026] Preferably, the stability evaluation module includes: a resistance calculation unit, which calculates the actual oxygen supply resistance value based on the dynamic viscosity correction parameter, the actual oxygen flow rate and the preset geometric parameters of the oxygen supply pipeline of the oxygen chamber;

[0027] The deviation index generating unit is used to generate the oxygen flow deviation index according to the preset target oxygen supply resistance value, the preset target oxygen flow rate and the actual oxygen supply resistance value. , and according to the oxygen flow deviation index Triggering the tiered compensation strategy:

[0028] : The oxygen supply is determined to be stable and compensation is not triggered;

[0029] : Send micro-compensation instructions to the closed-loop compensation module;

[0030] : Send emergency compensation instructions to the closed-loop compensation module;

[0031] The air pressure compensation channel and the air leakage compensation channel are triggered in stages according to the oxygen flow deviation index:

[0032] Micro-compensation commands require only air pressure adjustment to restore steady state;

[0033] In case of emergency compensation command, the air pressure compensation channel and the air leakage compensation channel work together to quickly suppress fluctuations with air pressure compensation, and then suppress the leakage source with air leakage compensation.

[0034] Preferably, the closed-loop compensation module further includes:

[0035] A strategy decision unit, configured to generate a dual-channel compensation strategy based on a comparison result of the oxygen flow deviation index and a preset compensation trigger threshold: an air pressure compensation value and an air leakage compensation value;

[0036] When the pressure compensation value is lower than the preset compensation trigger threshold, the intake pressure is increased proportionally to increase the oxygen flow driving force; when the pressure compensation value is higher than the compensation trigger threshold, the pressure is reduced to avoid flow rate overshoot;

[0037] The leakage compensation channel acts on the pipeline sealing mechanism. When the leakage compensation value exceeds the preset oxygen chamber safety leakage threshold, the seal is driven to seal the leakage point, and the actual oxygen supply resistance value after compensation is fed back to the dynamic modeling module.

[0038] Preferably, the closed-loop compensation module feeds back the compensated actual oxygen supply resistance value to the dynamic modeling module for updating the oxygen chamber material-gas coupling coefficient through the following steps:

[0039] Compare the deviation between the actual oxygen supply resistance value after compensation and the target oxygen supply resistance value to generate the resistance error;

[0040] Adjust the weight distribution rule of the oxygen chamber material-gas coupling coefficient based on the resistance error;

[0041] The updated oxygen chamber material-gas coupling coefficient distribution rule is applied to the subsequent dimensionless calculation of the field variable matrix.

[0042] Preferably, the air supply pressure is changed by adjusting the opening of the air inlet end of the air pressure servo valve group, and the detected oxygen chamber pipeline pressure drop is added with the air pressure compensation value to obtain the compensated oxygen chamber pipeline pressure drop. The compensated actual oxygen supply resistance value is calculated based on the compensated oxygen chamber pipeline pressure drop, the geometric parameters of the oxygen chamber oxygen supply pipeline and the dynamic viscosity correction parameters.

[0043] Beneficial effects:

[0044] By introducing a coupled model of air pressure, temperature, and leakage rate, the nonlinear change of oxygen viscosity under high-pressure environment is quantified, solving the defect of traditional models that only consider a single variable.

[0045] All parameters are designed around the specific scenarios of the oxygen chamber to avoid ambiguity of general parameters. For example, the pipeline pressure drop is directly related to the calculation of oxygen supply resistance, ensuring that the model input is strongly related to clinical needs.

[0046] By integrating the oxygen flow deviation index of resistance and flow rate deviation, hierarchical management of oxygen supply stability is achieved:

[0047] Independent dual-channel compensation strategy air pressure compensation: adjust the intake pressure through the servo valve to directly correct the resistance deviation, with a response time of less than 2 seconds; leakage compensation: dynamically adjust the leak area through the sealing mechanism, and achieve double interference suppression for the nonlinear relationship between leakage rate and air pressure. In the leakage scenario, this solution independently controls the dual channels to ensure the stability of the improved air pressure under complex interference.

[0048] The compensated resistance value is fed back to the dynamic modeling module, and the oxygen chamber material-gas coupling coefficient is updated through the gradient descent method to adapt to the aging of the oxygen chamber material or the environmental drift during long-term operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0050] Figure 1 It is a logic block diagram of the system of the present invention;

[0051] Figure 2 This is a logic block diagram of the data acquisition module of the system of the present invention. DETAILED DESCRIPTION

[0052] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0053] Example 1:

[0054] The embodiment of the present invention provides an intelligent control system for gas medical equipment. Figure 1 , Figure 1 This is a logic block diagram of an intelligent control system for gas medical equipment provided by an embodiment of the present invention. The system includes:

[0055] The data acquisition module is used to obtain the oxygen chamber service environment parameters, including the actual oxygen chamber pressure value, the oxygen chamber pipeline leakage rate, the oxygen chamber internal temperature value and the actual oxygen flow rate;

[0056] Dynamic modeling module, used to construct field variable matrix based on oxygen chamber service environment parameters and output dynamic viscosity correction parameters;

[0057] A stability evaluation module is used to calculate the actual oxygen supply resistance value using the dynamic viscosity correction parameter, and generate an oxygen flow deviation index by combining the preset target oxygen supply resistance value and the actual oxygen flow rate;

[0058] The closed-loop compensation module is used to execute a dual-channel compensation strategy based on the oxygen flow deviation index, output an air pressure compensation value and an air leakage compensation value, and then compensate the actual oxygen supply resistance value. The compensated actual oxygen supply resistance value is fed back to the dynamic modeling module to dynamically adjust the calculation formula of the dynamic viscosity correction parameter;

[0059] The closed-loop compensation module includes an air pressure compensation channel and an air leakage compensation channel:

[0060] The air pressure compensation channel controls the opening of the air pressure servo valve group of the air supply main pipeline, and adjusts the opening of the pressure valve at the air inlet end of the oxygen chamber according to the air pressure compensation value;

[0061] The leakage compensation channel acts on the pipeline sealing adjustment mechanism, and drives the seal to compensate for the leakage rate according to the leakage compensation value.

[0062] Pressure sensing unit: A differential pressure transmitter is installed at the inlet and outlet of the oxygen chamber gas supply main pipeline to collect the pressure difference in real time to calculate the actual pressure value Pact .

[0063] Flow monitoring unit: Use an ultrasonic leak detector to locate the leak point based on the time difference method and calculate the leak rate using the Bernoulli equation.

[0064] Temperature acquisition unit: Thermocouple array (K type) is distributed in the cabin interlayer (spacing 20cm) and the pipe insulation layer (every 50cm), and collects T at a period of 100ms. act and temperature gradient.

[0065] Data processing: Each sensor signal is converted into a digital signal by a 24-bit ADC, with a millisecond-level timestamp attached, and transmitted to the dynamic modeling module via the CAN bus.

[0066] This system achieves intelligent control of oxygen supply in the oxygen chamber through the collaborative work of four modules. The data acquisition module first acquires key environmental parameters, which serve as the basis for subsequent modeling and evaluation. The dynamic modeling module uses these parameters to construct a field variable matrix, quantifying the dynamic changes in oxygen viscosity and providing core parameters for resistance calculation. The stability assessment module determines the stability of the oxygen supply by calculating resistance and excursion index, deciding whether to trigger compensation. The closed-loop compensation module adjusts the air pressure and leakage based on the evaluation results and feeds the compensated results back to the modeling module to optimize the model parameters and form a closed-loop control.

[0067] See also Figure 2 , Figure 2 The following is the logic block diagram of the data acquisition module, which includes:

[0068] The pressure sensing unit is installed at the air inlet and outlet of the oxygen chamber's main air supply pipe, and collects the actual air pressure value of the oxygen chamber in real time through the pressure differential transmitter;

[0069] The flow monitoring unit uses an ultrasonic leak detector to locate the leak point of the oxygen chamber pipeline based on the time difference method and calculates the leakage rate of the oxygen chamber pipeline using the Bernoulli equation;

[0070] The temperature acquisition unit includes a thermocouple array distributed in the oxygen chamber interlayer and the oxygen supply pipeline insulation layer, which obtains the internal temperature value of the oxygen chamber and the temperature gradient of the pipeline wall according to the preset sampling period;

[0071] Among them, the output signals of the pressure sensing unit, flow monitoring unit and temperature acquisition unit are all converted into environmental parameters including time stamps through the analog-to-digital conversion module and input into the dynamic modeling module.

[0072] The data acquisition module uses three types of sensors to collect data on air pressure, leakage rate, and temperature. The pressure sensing unit uses a differential pressure transmitter to measure the pressure difference between the two ends of the pipeline, obtaining the actual air pressure value, which is used to analyze the impact of air pressure on oxygen viscosity. The flow monitoring unit uses the ultrasonic time difference method to locate the leak point and then calculates the leakage rate using the Bernoulli equation to monitor the pipeline sealing status. The temperature acquisition unit uses a thermocouple array to obtain the cabin temperature and pipeline temperature gradient for temperature-dependent viscosity correction calculations. All data undergoes analog-to-digital conversion to generate a time-stamped dataset to ensure time synchronization and provide accurate input for dynamic modeling.

[0073] The dynamic modeling module includes:

[0074] Multi-field data fusion unit is used to convert the actual pressure value P of the oxygen chamber into act , oxygen chamber pipeline leakage rate Q leaK、 Oxygen chamber internal temperature T act and the temperature gradient of the pipe wall, and convert it into a dimensionless field variable matrix;

[0075] The viscosity correction calculation unit is used to perform the following calculation operations based on the field variable matrix:

[0076] (a) Extracting temperature gradient data from the field variable matrix and generating temperature correction coefficients using the temperature-viscosity relationship model;

[0077] (b) Extracting air pressure data from the field variable matrix and obtaining the air pressure influence factor based on the mapping relationship between air pressure and gas density;

[0078] (c) Extract the oxygen chamber pipeline leakage rate from the field variable matrix, combine the temperature correction coefficient and air pressure influence factor, and calculate the dynamic viscosity correction parameter through the weighted model :

[0079] ;

[0080] Where μ0 is the standard oxygen viscosity, k1, k2, k3, and n are the oxygen chamber material-gas coupling coefficients, and Q max is the maximum allowable leakage rate of the oxygen chamber; P act : The actual air pressure value of the oxygen chamber is collected in real time through the pressure difference sensor, Q leaK : Leakage rate of oxygen chamber pipeline, calculated by ultrasonic leak detector, T act : The internal temperature of the oxygen chamber is collected by the thermocouple array, where P0 is the standard atmospheric pressure and T0 is the standard temperature;

[0081] The formula is derived based on the Sutherland equation and the gas state equation. Describe the nonlinear effect of air pressure on oxygen viscosity;

[0082] Dynamic viscosity correction parameter μmod Synchronous input to the stability evaluation module and closed-loop compensation module.

[0083] The oxygen chamber material-gas coupling coefficient is a set of constants calibrated through experiments, which reflects the nonlinear effect of the oxygen chamber sealing material (such as silicone and fluororubber) on the viscosity of oxygen, including the pressure sensitivity coefficient, leakage influence coefficient, temperature sensitivity coefficient and nonlinear index.

[0084] Composition and symbols:

[0085] k1: air pressure sensitivity coefficient, unit is , describing the intensity of the effect of unit air pressure change on oxygen viscosity.

[0086] k2: Leakage influence coefficient, dimensionless, describing the maximum correction ratio of leakage rate to oxygen viscosity.

[0087] k 3： Temperature sensitivity coefficient, in , describing the intensity of the effect of unit temperature change on oxygen viscosity.

[0088] : Nonlinear index, dimensionless, reflects the accelerating effect of leakage rate on viscosity under high pressure environment (such as n=2.5). By fitting the leakage data of hyperbaric oxygen chamber (working pressure 200-400kPa), it is determined that the model accuracy is highest when the nonlinear index n=2.5.

[0089] The above coefficients are directly involved in the calculation of the dynamic viscosity correction parameter and determine the output result of the dynamic viscosity correction parameter.

[0090] The dynamic modeling module first converts multi-source data into a dimensionless field variable matrix to eliminate the influence of dimension differences. Then, through the coupled calculation of temperature, air pressure, and leakage rate, the dynamic viscosity correction parameter is generated. The temperature correction coefficient reflects the linear effect of temperature change on viscosity, the air pressure influence factor describes the nonlinear growth of viscosity under high pressure through an exponential function, and the leakage correction term quantifies the amplification effect of leakage on viscosity through a power function. The final formula combines the three factors and outputs the corrected viscosity value, which provides the key parameters for resistance calculation. Dimensionless range: P act (0-1 corresponds to 100-400kPa), Q leaK (0-1 corresponds to 0-0.5L / min), T act (0-1 corresponds to 18-28°C), generating a 3×10 matrix (10 samples per second).

[0091] Viscosity correction calculation unit

[0092] Temperature correction: Based on the simplified Sutherland formula, 1-k3 (T act-25) in which k3=0.02, such as ℃, correction factor = 1-0.02×5=0.9, : Temperature sensitivity coefficient, unit: °C -1 , describes the proportional effect of a 1°C temperature change on viscosity;

[0093] : Standard temperature, 25℃ (298K).

[0094] Barometric pressure correction: ,when , kPa -1 , :Standard atmospheric pressure, 101.325kPa, then the impact factor = 2.68, : Air pressure sensitivity coefficient, unit kPa -1 , describes the effect of a 1 kPa change in air pressure on viscosity;

[0095] Leak Correction ,like , correction term = 1+0.8×(0.2)^2.5≈1+0.8×0.089≈1.071.

[0096] in, : Leakage influence coefficient, dimensionless, describing the maximum correction ratio of leakage rate to viscosity;

[0097] : Maximum allowable leakage rate, in L / min, specified by GB standard (e.g. 0.5 L / min);

[0098] : Leakage rate of oxygen chamber pipeline, calculated by ultrasonic leak detector;

[0099] : Nonlinear index, dimensionless, reflecting the acceleration effect of leakage under high pressure (such as n=2.5).

[0100] Comprehensive calculation:

[0101] .

[0102] The stability assessment module includes:

[0103] Resistance calculation unit, based on dynamic viscosity correction parameters , geometric parameters of oxygen supply pipeline of oxygen chamber (inner diameter of oxygen supply pipeline , length of oxygen supply pipeline and number of elbows) and actual oxygen flow rate , calculate the actual oxygen supply resistance value :

[0104] ;

[0105] in, is the oxygen chamber pipeline pressure drop, unit is Pa, measured by the differential pressure sensor;

[0106] : Inner diameter of oxygen supply pipeline;

[0107] : Length of oxygen supply pipeline;

[0108] is the dynamic viscosity correction parameter;

[0109] Calculate the actual oxygen supply resistance value The formula is derived from the Hagen-Poiseuille equation, which is applicable to laminar flow conditions and calculates the resistance per unit length.

[0110] The deviation index generating unit is used to generate the deviation index according to the preset target oxygen supply resistance value. , preset target oxygen flow rate and actual oxygen supply resistance value , generating the oxygen flux deviation index :

[0111] ;

[0112] in, : Actual oxygen flow rate, in L / min, monitored by a mass flow meter;

[0113] : Target oxygen flow rate, in L / min, input by the doctor's order system;

[0114] is the actual oxygen supply resistance value;

[0115] is the oxygen flow deviation index;

[0116] is the target oxygen supply resistance value;

[0117] The deviation index quantifies the total deviation of resistance and flow rate by summing their absolute values.

[0118] Oxygen flow deviation index Triggering the tiered compensation strategy:

[0119] : The oxygen supply is determined to be stable and compensation is not triggered;

[0120] : Send micro-compensation instructions to the closed-loop compensation module;

[0121] : Send emergency compensation instructions to the closed-loop compensation module.

[0122] The stability assessment module first calculates the actual oxygen supply resistance based on dynamic viscosity, pipeline geometry, and actual oxygen flow rate. Pipeline pressure drop reflects the energy loss of oxygen flow, while the inner diameter and length of the pipeline affect the resistance. The dynamic viscosity correction parameter reflects the impact of environmental changes. The oxygen flow deviation index comprehensively assesses stability by measuring the relative deviation between resistance and flow rate. Grading thresholds (e.g., 0.05, 0.10) correspond to clinically acceptable fluctuation ranges, triggering different compensation strategies to ensure treatment safety.

[0123] The closed-loop compensation module includes:

[0124] A strategy decision unit, configured to generate a dual-channel compensation strategy based on a comparison result of the oxygen flow deviation index and a preset compensation trigger threshold: an air pressure compensation value and an air leakage compensation value;

[0125] (a) Air pressure compensation value :

[0126] ;

[0127] in: : air pressure compensation weight coefficient, in Pa·s / N, used to adjust the compensation intensity (e.g. α=0.5);

[0128] The preset target oxygen supply resistance value

[0129] is the actual oxygen supply resistance value;

[0130] Length of oxygen supply pipe for oxygen chamber;

[0131] The inner diameter of the oxygen supply pipe of the oxygen chamber;

[0132] is the dynamic viscosity correction parameter;

[0133] The formula reversely calculates the required air pressure adjustment through the resistance deviation, which is proportional to the length of the oxygen supply pipeline and inversely proportional to the inner diameter and viscosity of the oxygen supply pipeline.

[0134] When the actual oxygen supply resistance value is lower than the preset target oxygen supply resistance value, the air pressure of the air pressure servo valve group is increased proportionally to increase the oxygen flow driving force; when the actual oxygen supply resistance value is higher than the target oxygen supply resistance value, the pressure is reduced to avoid flow rate overshoot;

[0135] The leakage compensation channel acts on the pipeline sealing mechanism. When the leakage compensation value exceeds the preset oxygen chamber safety leakage threshold, the seal is driven to seal the leakage point, and the actual oxygen supply resistance value after compensation is fed back to the dynamic modeling module.

[0136] (b) Leakage compensation value :

[0137] ;

[0138] : Leakage compensation weight coefficient, unit L / min·s, adjusts compensation accuracy (such as β=2);

[0139] : is the safety leakage threshold, unit is L / min;

[0140] : is the leakage rate of the oxygen chamber pipeline, calculated by ultrasonic leak detector;

[0141] The actual air pressure value of the oxygen chamber is collected in real time by the pressure difference sensor;

[0142] P0 is standard atmospheric pressure;

[0143] k4: High pressure amplification index, dimensionless, describes the nonlinear effect of air pressure on leakage compensation (e.g. k4=1.2).

[0144] The closed-loop compensation module performs dual-channel compensation based on the offset index: air pressure compensation directly corrects the resistance deviation by adjusting the opening of the pressure valve at the intake end; leakage compensation reduces pipeline leakage by driving the seal to deform.

[0145] The weight coefficients (α, β, and k4) in the compensation formula are tuned experimentally to ensure compensation accuracy and response speed. The servo valve assembly and seal adjustment mechanism have high dynamic response capabilities. The compensated resistance value is fed back to the modeling module, and the oxygen chamber material-gas coupling coefficient is iteratively updated to adapt the model to equipment aging or environmental changes.

[0146] (a) Pneumatic servo valve group, according to Adjust the opening of the pressure valve at the oxygen chamber inlet end;

[0147] (b) Pipeline sealing adjustment mechanism, according to Drive the seal to deform to compensate for the leakage rate;

[0148] Actual oxygen supply resistance value after compensation Feedback to the dynamic modeling module to update the oxygen chamber material-gas coupling coefficient .

[0149] Pneumatic servo valve group: such as FestoMPYE series, according to Adjust valve opening with an accuracy of 0.1%;

[0150] Pipeline sealing adjustment mechanism: such as electric rubber sealing ring, according to Adjust the deformation and reduce the leak area.

[0151] The strategy decision unit; the compensated actual oxygen supply resistance value is fed back to the dynamic modeling module, which is used to update the oxygen chamber material-gas coupling relationship through the following steps:

[0152] (a) Compare the deviation between the actual oxygen supply resistance value after compensation and the target oxygen supply resistance value to generate the resistance error;

[0153] (b) Adjusting the weight distribution rule of the oxygen chamber material-gas coupling coefficient in the viscosity correction calculation unit based on the resistance error;

[0154] (c) Apply the updated oxygen chamber material-gas coupling coefficient weight distribution rule to the subsequent dimensionless calculation of the field variable matrix.

[0155] 1. Deviation comparison:

[0156] After compensation, the actual oxygen supply resistance value is recalculated by the pressure sensing unit. If the target value is 20000 and the value after compensation is 19800, the resistance error is .

[0157] Resistance error ,in is the actual resistance value after compensation, which is used to evaluate the compensation effect.

[0158] Oxygen chamber material-gas coupling coefficient adjustment:

[0159] by As an example, calculate other terms of partial derivatives:

[0160] ;

[0161] in, is the actual oxygen supply resistance value;

[0162] k1: air pressure sensitivity coefficient, unit is , describes the intensity of the effect of unit pressure change on oxygen viscosity;

[0163] is the oxygen chamber pipeline pressure drop;

[0164] : is the inner diameter of the oxygen supply pipeline;

[0165] : is the length of the oxygen supply pipeline;

[0166] μ0 is the standard oxygen viscosity;

[0167] P act : Actual air pressure value of oxygen chamber;

[0168] P0 is standard atmospheric pressure;

[0169] C: is other terms in the dynamic viscosity correction parameter formula that are not related to K1 and is used to isolate the effect of a single coefficient on resistance. Specific expression:

[0170] ;

[0171] Will Assume that ,but:

[0172] ;

[0173] in is the corrected air pressure sensitivity coefficient, E is the resistance error;

[0174] Thus, the corrected pressure sensitivity coefficient is obtained .

[0175] Adjustment based on error amount The weight of , by gradient descent method:

[0176]

[0177] : Iteration step coefficient, dimensionless (e.g. γ = 0.02), controls the coefficient update amplitude to avoid oscillation;

[0178] : The partial derivative of the drag with respect to the oxygen chamber material-gas coupling coefficient, reflecting the influence of the coefficient change on the drag;

[0179] Updated It is used for dimensionless calculation of the field variable matrix next time, for example After adjustment, the air pressure influence factor The adjusted coefficients are used for dimensionless processing of the field variable matrix, such as recalculating the pressure influence factor. , making the model more in line with actual working conditions.

[0180] The air supply pressure is changed by adjusting the opening of the air inlet end of the air pressure servo valve group. The detected oxygen chamber pipeline pressure drop is added to the air pressure compensation value to obtain the compensated oxygen chamber pipeline pressure drop. The actual oxygen supply resistance value after compensation is calculated based on the compensated oxygen chamber pipeline pressure drop, the geometric parameters of the oxygen chamber oxygen supply pipeline and the dynamic viscosity correction parameters.

[0181] By adjusting the opening of the air pressure servo valve group of the main oxygen supply pipeline, the air supply pressure is changed, which directly affects the pressure drop of the oxygen chamber pipeline. .

[0182] Compensation equation:

[0183] ;

[0184] in, is the oxygen chamber pipeline pressure drop after compensation;

[0185] is the oxygen chamber pipeline pressure drop;

[0186] is the air pressure compensation value;

[0187] Substitute the actual oxygen supply resistance value Calculation formula:

[0188] ;

[0189] For every 1kPa increase in air pressure compensation, the resistance value increases by about 8%-12%, which is positively correlated with the size of the oxygen supply pipeline;

[0190] in: is the actual resistance value after compensation;

[0191] : is the oxygen chamber pipeline pressure drop;

[0192] : is the air pressure compensation value;

[0193] : is the inner diameter of the oxygen supply pipeline;

[0194] : is the length of the oxygen supply pipeline;

[0195] 2. Leakage compensation:

[0196] Working principle: Reduce the leakage rate by deformation of the sealing mechanism ( key input), indirectly reducing dynamic viscosity fluctuations.

[0197] Leakage correction:

[0198] ;

[0199] in: : is the oxygen chamber pipeline leakage rate after compensation;

[0200] : is the leakage rate of the oxygen chamber pipeline;

[0201] : Leakage compensation value;

[0202] Impact on Viscosity: Updated dynamic viscosity calculations:

[0203] ;

[0204] in, : Corrected dynamic viscosity parameter;

[0205] μ0 is the standard oxygen viscosity;

[0206] k1, k2, k3, and n are the oxygen chamber material-gas coupling coefficients;

[0207] Q max : is the maximum allowable leakage rate of the oxygen chamber;

[0208] P act : The actual air pressure value of the oxygen chamber is collected in real time through the pressure difference sensor;

[0209] Q leaK : Leakage rate of oxygen chamber pipeline, calculated by ultrasonic leak detector;

[0210] T act : The internal temperature of the oxygen chamber is collected by the thermocouple array, where P0 is the standard atmospheric pressure and T0 is the standard temperature;

[0211] : The pressure change in the oxygen chamber, the difference between the actual pressure in the oxygen chamber and the standard atmospheric pressure;

[0212] : The maximum allowable leakage rate of the oxygen chamber pipeline is a set threshold used to define the reasonable range of leakage;

[0213] : Temperature change in the oxygen chamber, the difference between the internal temperature of the oxygen chamber and the standard temperature;

[0214] The leakage rate is reduced by 0.1L / min and the viscosity fluctuation is reduced by 15%-20%.

[0215] The actual oxygen supply resistance value after compensation is:

[0216] ;

[0217] in: : is the actual oxygen supply resistance value after correction;

[0218] : is the pressure drop of the oxygen chamber pipeline;

[0219] : is the inner diameter of the oxygen supply pipeline;

[0220] : is the length of the oxygen supply pipeline;

[0221] : is the corrected dynamic viscosity parameter.

[0222] The compensated actual oxygen supply resistance value is fed back to the dynamic modeling module to dynamically adjust the oxygen chamber material-gas coupling coefficient in the calculation formula of the dynamic viscosity correction parameter.

[0223] The deviation between the compensated resistance value and the target value is used to update the model coefficients. The resistance error is first calculated, and then the weights of the chamber material-gas coupling coefficients in the viscosity correction model are adjusted based on this error. By adjusting the weight distribution rules, the model output is brought closer to the actual resistance value. The updated coefficients are then applied to subsequent data processing to achieve adaptive optimization of the model, ensuring system control accuracy during long-term operation and adapting to changes in chamber material aging or environmental parameters.

[0224] The above contents are merely examples and explanations of the concept of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the present invention, they should all fall within the scope of protection of the present invention.

Claims

1. An intelligent control system for gas medical equipment, characterized in that: include: The data acquisition module is used to obtain the oxygen chamber service environment parameters, including the actual oxygen chamber pressure value, the oxygen chamber pipeline leakage rate, the oxygen chamber internal temperature value and the actual oxygen flow rate; Dynamic modeling module, used to construct field variable matrix based on oxygen chamber service environment parameters and output dynamic viscosity correction parameters; A stability evaluation module is used to calculate the actual oxygen supply resistance value using the dynamic viscosity correction parameter, and generate an oxygen flow deviation index by combining the preset target oxygen supply resistance value and the actual oxygen flow rate; The closed-loop compensation module is used to execute a dual-channel compensation strategy based on the oxygen flow deviation index, output an air pressure compensation value and an air leakage compensation value, and then compensate the actual oxygen supply resistance value. The compensated actual oxygen supply resistance value is fed back to the dynamic modeling module to dynamically adjust the calculation formula of the dynamic viscosity correction parameter; The closed-loop compensation module includes an air pressure compensation channel and an air leakage compensation channel: The air pressure compensation channel controls the opening of the air pressure servo valve group of the air supply main pipeline, and adjusts the opening of the pressure valve at the air inlet end of the oxygen chamber according to the air pressure compensation value; The leakage compensation channel acts on the pipeline sealing adjustment mechanism, driving the seal to compensate for the leakage rate according to the leakage compensation value; The dynamic modeling module includes: The multi-field data fusion unit is used to convert the actual oxygen chamber pressure value, oxygen chamber pipeline leakage rate, oxygen chamber internal temperature value and pipeline wall temperature gradient into a dimensionless field variable matrix; The viscosity correction calculation unit is used to perform the following calculation operations based on the field variable matrix: (a) Extracting temperature gradient data from the field variable matrix and generating temperature correction coefficients using the temperature-viscosity relationship model; (b) Extracting air pressure data from the field variable matrix and obtaining the air pressure influence factor based on the mapping relationship between air pressure and gas density; (c) Extract the oxygen chamber pipeline leakage rate from the field variable matrix, combine the temperature correction coefficient and the air pressure influence factor, and calculate the dynamic viscosity correction parameter μ through the weighted model mod : Where μ0 is the standard oxygen viscosity, k1, k2, k3, n are the oxygen chamber material-gas coupling coefficients, Q max is the maximum allowable leakage rate of the oxygen chamber; P act The actual air pressure value of the oxygen chamber is collected in real time by the pressure difference sensor. leak is the leakage rate of the oxygen chamber pipeline, calculated by ultrasonic leak detector, T act is the internal temperature of the oxygen chamber, collected by the thermocouple array, P0 is the standard atmospheric pressure, and T0 is the standard temperature; The dynamic viscosity correction parameter is synchronously input into the stability evaluation module and the closed-loop compensation module.

2. The intelligent control system for gas medical equipment according to claim 1, characterized in that: The data acquisition module includes: The pressure sensing unit is installed at the air inlet and outlet of the oxygen chamber's main air supply pipe, and collects the actual air pressure value of the oxygen chamber in real time through the pressure differential transmitter; The flow monitoring unit uses an ultrasonic leak detector to locate the leak point of the oxygen chamber pipeline based on the time difference method and calculates the leakage rate of the oxygen chamber pipeline using the Bernoulli equation; The temperature acquisition unit includes a thermocouple array distributed in the oxygen chamber interlayer and the oxygen supply pipeline insulation layer, which obtains the internal temperature value of the oxygen chamber and the temperature gradient of the pipeline wall according to the preset sampling period; Among them, the output signals of the pressure sensing unit, flow monitoring unit and temperature acquisition unit are all converted into environmental parameters including time stamps through the analog-to-digital conversion module and input into the dynamic modeling module.

3. The intelligent control system for gas medical equipment according to claim 2, characterized in that: The stability assessment module includes: a resistance calculation unit, which calculates the actual oxygen supply resistance value based on the dynamic viscosity correction parameter, the actual oxygen flow rate and the preset geometric parameters of the oxygen supply pipeline of the oxygen chamber; The deviation index generating unit is used to generate the oxygen flow deviation index δ according to the preset target oxygen supply resistance value, the preset target oxygen flow rate and the actual oxygen supply resistance value. oxy , and according to the oxygen flow deviation index δ oxy Triggering the tiered compensation strategy: δ oxy ≤0.05: oxygen supply is determined to be stable and compensation is not triggered; 0.05<δ oxy ≤0.10: Send micro-compensation instructions to the closed-loop compensation module; δ oxy >0.10: Send emergency compensation instructions to the closed-loop compensation module; The air pressure compensation channel and the air leakage compensation channel are triggered in stages according to the oxygen flow deviation index: Micro-compensation commands require only air pressure adjustment to restore steady state; In case of emergency compensation command, the air pressure compensation channel and the air leakage compensation channel work together to quickly suppress fluctuations with air pressure compensation, and then suppress the leakage source with air leakage compensation.

4. The intelligent control system for gas medical equipment according to claim 3, characterized in that: The closed-loop compensation module also includes: A strategy decision unit, configured to generate a dual-channel compensation strategy based on a comparison result of the oxygen flow deviation index and a preset compensation trigger threshold: an air pressure compensation value and an air leakage compensation value; When the actual oxygen supply resistance value is lower than the preset target oxygen supply resistance value, the air pressure of the air pressure servo valve group is increased proportionally to increase the oxygen flow driving force; when the actual oxygen supply resistance value is higher than the target oxygen supply resistance value, the pressure is reduced to avoid flow rate overshoot; The leakage compensation channel acts on the pipeline sealing mechanism. When the leakage compensation value exceeds the preset oxygen chamber safety leakage threshold, the seal is driven to seal the leakage point, and the actual oxygen supply resistance value after compensation is fed back to the dynamic modeling module.

5. The intelligent control system for gas medical equipment according to claim 4, characterized in that: The closed-loop compensation module feeds back the compensated actual oxygen supply resistance value to the dynamic modeling module, which is used to update the oxygen chamber material-gas coupling coefficient through the following steps: Compare the deviation between the actual oxygen supply resistance value after compensation and the target oxygen supply resistance value to generate the resistance error; Adjust the weight distribution rule of the oxygen chamber material-gas coupling coefficient based on the resistance error; The updated oxygen chamber material-gas coupling coefficient distribution rule is applied to the subsequent dimensionless calculation of the field variable matrix.

6. The intelligent control system for gas medical equipment according to claim 5, characterized in that: The air supply pressure is changed by adjusting the opening of the air inlet end of the air pressure servo valve group. The detected oxygen chamber pipeline pressure drop is added to the air pressure compensation value to obtain the compensated oxygen chamber pipeline pressure drop. The actual oxygen supply resistance value after compensation is calculated based on the compensated oxygen chamber pipeline pressure drop, the geometric parameters of the oxygen chamber oxygen supply pipeline and the dynamic viscosity correction parameters.

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