Intelligent control system for gas medical equipment

Abstract

The invention discloses an intelligent control system for gas medical equipment, and relates to the technical field of medical equipment control, and the system comprises a data collection module which obtains oxygen cabin service environment parameters, and the oxygen cabin service environment parameters comprise an oxygen cabin actual air pressure value, an oxygen cabin pipeline leakage rate and an oxygen cabin internal temperature value; the dynamic modeling module is used for constructing a field variable matrix based on the oxygen cabin service environment parameters and outputting dynamic viscosity correction parameters; the stability evaluation module is used for calculating an actual oxygen supply resistance value by using the dynamic viscosity correction parameter, and generating an oxygen flow offset index in combination with the target oxygen supply resistance value and the actual oxygen flow velocity so as to evaluate the oxygen supply stability; the closed-loop compensation module is used for executing a double-channel compensation strategy according to the oxygen flow deviation index, outputting an air pressure compensation value and an air leakage compensation value, then compensating an actual oxygen supply resistance value, and feeding back the compensated actual oxygen supply resistance value to the dynamic modeling module to dynamically adjust a calculation formula of a dynamic viscosity correction parameter. And accurate control of oxygen supply stability is realized.

Description

Technical Field

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

[0002] During the treatment process of a hyperbaric oxygen chamber, the viscosity of oxygen is non-linearly affected by factors such as air pressure, temperature, and pipeline air leakage, which easily causes the oxygen supply resistance and flow rate to deviate from the target range. It is difficult for traditional control systems to compensate for multi-source interference in real time and dynamically. In this embodiment, by constructing a closed-loop link of "data acquisition - modeling - evaluation - compensation - iteration", precise control of oxygen supply stability is achieved. 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 art.

[0004] To solve the above technical problems, the present invention provides an intelligent control system for gas medical equipment, including: A data acquisition module, configured to obtain the service environment parameters of the oxygen chamber, where the service environment parameters of the oxygen chamber include the actual air pressure value of the oxygen chamber, the air leakage rate of the oxygen chamber pipeline, the internal temperature value of the oxygen chamber, and the actual oxygen flow rate; A dynamic modeling module, configured to construct a field variable matrix based on the service environment parameters of the oxygen chamber and output dynamic viscosity correction parameters; A stability evaluation module, configured to calculate the actual oxygen supply resistance value by using the dynamic viscosity correction parameters, and generate an oxygen flow deviation index in combination with a preset target oxygen supply resistance value and the actual oxygen flow rate; A closed-loop compensation module, configured to execute a dual-channel compensation strategy according to the oxygen flow deviation index, output an air pressure compensation value and an air leakage compensation value, then compensate the actual oxygen supply resistance value, and feedback the compensated actual oxygen supply resistance value to the dynamic modeling module to dynamically adjust the calculation formula of the dynamic viscosity correction parameters; The closed-loop compensation module includes an air pressure compensation channel and an air leakage compensation channel: The air pressure compensation channel regulates the opening degree of the air pressure servo valve group of the main gas supply pipeline, and adjusts the opening degree of the pressure valve at the oxygen chamber intake end according to the air pressure compensation value; The air leakage compensation channel acts on the pipeline sealing adjustment mechanism and drives the seal to compensate for the air leakage rate according to the air leakage compensation value.

[0005] Preferably, the data acquisition module includes: A pressure sensing unit, installed at the intake end and the outlet end of the main gas supply pipeline of the oxygen chamber, and configured to collect the actual air pressure value of the oxygen chamber in real time through a differential pressure transmitter; A flow monitoring unit, using an ultrasonic leak detector, positioning the air leakage point of the oxygen chamber pipeline based on the time difference method, and calculating the air leakage rate of the oxygen chamber pipeline through the Bernoulli equation; The temperature acquisition unit includes a thermocouple array distributed in the interlayer of the oxygen chamber body and the heat insulation layer of the oxygen supply pipeline, and obtains the internal temperature value of the oxygen chamber and the temperature gradient of the pipeline wall surface according to a preset sampling period; Among them, the output signals of the pressure sensing unit, the flow monitoring unit, and the temperature acquisition unit all generate environmental parameters including time stamps through the analog-to-digital conversion module and are input into the dynamic modeling module.

[0006] Preferably, the dynamic modeling module includes: The multi-field data fusion unit is used to convert the actual air pressure value of the oxygen chamber, the air leakage rate of the oxygen chamber pipeline, the internal temperature value of the oxygen chamber, and the temperature gradient of the pipeline wall surface 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) Extract the temperature gradient data from the field variable matrix and generate a temperature correction coefficient through the temperature-viscosity relationship model; (b) Extract the air pressure data from the field variable matrix and obtain the air pressure influence factor based on the mapping relationship between air pressure and gas density; (c) Extract the air leakage rate of the oxygen chamber pipeline from the field variable matrix, and combine the temperature correction coefficient and the air pressure influence factor to calculate the dynamic viscosity correction parameter through the weighted model : ; Wherein is the standard oxygen viscosity, is the oxygen chamber material-gas coupling coefficient, is the maximum allowable air leakage rate of the oxygen chamber; : The actual air pressure value of the oxygen chamber is collected in real time through a differential pressure sensor, Q leak : The air leakage rate of the oxygen chamber pipeline is calculated through an ultrasonic leak detector, : The internal temperature value of the oxygen chamber is collected through a thermocouple array, is the standard atmospheric pressure, is the standard temperature; The dynamic viscosity correction parameter is synchronously input into the stability evaluation module and the closed-loop compensation module.

[0007] 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; The offset index generation unit is used to generate an oxygen flow offset 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 offset index trigger a hierarchical compensation strategy: : Determine that oxygen supply is stable and do not trigger compensation; : Send a micro-compensation instruction to the closed-loop compensation module; : Send an emergency compensation instruction to the closed-loop compensation module; The air pressure compensation channel and the air leakage compensation channel are triggered according to the oxygen flow offset index in grades: The micro-compensation instruction only requires air pressure adjustment to restore the steady state; For the emergency compensation instruction, the air pressure compensation channel and the air leakage compensation channel cooperate. First, the air pressure compensation quickly suppresses the fluctuation, and then the air leakage compensation suppresses the leakage source.

[0008] Preferably, the closed-loop compensation module further includes: A strategy decision-making unit for generating a dual-channel compensation strategy according to the comparison result of the oxygen flow offset index and the preset compensation trigger threshold: air pressure compensation value and air leakage compensation value; When the air pressure compensation value is lower than the preset compensation trigger threshold, increase the intake air pressure proportionally to increase the oxygen flow driving force; when the air pressure compensation value is higher than the compensation trigger threshold, reduce the pressure to avoid flow rate overshoot; The air leakage compensation channel acts on the pipeline sealing mechanism. When the air leakage compensation value exceeds the preset oxygen chamber safe air leakage threshold, drive the seal to block the leakage point, and the actual oxygen supply resistance value after compensation is fed back to the dynamic modeling module.

[0009] Preferably, the closed-loop compensation module feeds back the actual oxygen supply resistance value after compensation to the dynamic modeling module for updating the oxygen chamber material-gas coupling coefficient through the following steps: Compare the actual oxygen supply resistance value after compensation with the target oxygen supply resistance value to generate a resistance error amount; Adjust the weight distribution rule of the oxygen chamber material-gas coupling coefficient based on the resistance error amount; Apply the updated oxygen chamber material-gas coupling coefficient distribution rule to the dimensionless calculation of the subsequent field variable matrix.

[0010] Preferably, by adjusting the opening degree of the intake end of the air pressure servo valve group to change the supply air pressure, the detected oxygen chamber pipeline pressure drop plus the air pressure compensation value is used to obtain the oxygen chamber pipeline pressure drop after compensation, and the actual oxygen supply resistance value after compensation is calculated according to the oxygen chamber pipeline pressure drop after compensation, the geometric parameters of the oxygen chamber oxygen supply pipeline, and the dynamic viscosity correction parameter.

[0011] Beneficial effects: By introducing a coupling model of air pressure, temperature, and air leakage rate, the non-linear change of oxygen viscosity under high-pressure environment is quantified, and the defect that the traditional model only considers a single variable is solved.

[0012] All parameters are designed around the specific scenarios of the oxygen chamber to avoid the 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 relevant to clinical needs.

[0013] Through the oxygen flow deviation index that comprehensively considers resistance and flow rate deviation, hierarchical management of oxygen supply stability is achieved: Independent dual-channel compensation strategy for air pressure compensation: The intake air pressure is adjusted through a servo valve to directly correct the resistance deviation, with a response time < 2 seconds; Leakage compensation: The leakage hole area is dynamically adjusted through a sealing mechanism. In response to the non-linear relationship between the leakage rate and air pressure, dual interference suppression is achieved. In the case of a leakage scenario, this solution enables independent dual-channel control, which can enhance the stability of the boosted air pressure under combined interference.

[0014] 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 environmental drift during long-term operation. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0016] Figure 1 It is the logic block diagram of the system of the present invention; Figure 2 It is the logic block diagram of the data acquisition module of the system of the present invention. Detailed Embodiments

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0018] Embodiment 1: The embodiment of the present invention provides an intelligent control system for gas medical equipment. Refer to Figure 1 , Figure 1 It is the logic block diagram of an intelligent control system for gas medical equipment provided by an embodiment of the present invention. The system includes: A data acquisition module for obtaining the service environment parameters of the oxygen chamber. The service environment parameters of the oxygen chamber include the actual air pressure value of the oxygen chamber, the oxygen chamber pipeline leakage rate, the internal temperature value of the oxygen chamber, and the actual oxygen flow rate; A dynamic modeling module for constructing a field variable matrix based on the service environment parameters of the oxygen chamber and outputting dynamic viscosity correction parameters; A stability evaluation module for calculating the actual oxygen supply resistance value by using the dynamic viscosity correction parameters and generating an oxygen flow deviation index in combination with a preset target oxygen supply resistance value and the actual oxygen flow rate; A closed-loop compensation module for executing a dual-channel compensation strategy according to the oxygen flow deviation index, outputting a pressure compensation value and a leakage compensation value, then compensating the actual oxygen supply resistance value, and feeding back the compensated actual oxygen supply resistance value to the dynamic modeling module to dynamically adjust the calculation formula of the dynamic viscosity correction parameters; The closed-loop compensation module includes a pressure compensation channel and a leakage compensation channel: The pressure compensation channel regulates the opening degree of the pneumatic servo valve group of the main gas supply pipeline and adjusts the opening degree of the pressure valve at the oxygen chamber inlet end according to the pressure compensation value; The leakage compensation channel acts on the pipeline sealing adjustment mechanism and drives the seal to compensate the leakage rate according to the leakage compensation value.

[0019] A pressure sensing unit: A differential pressure transmitter is used, installed at the inlet and outlet ends of the main oxygen supply pipeline of the oxygen chamber, and the actual air pressure value P is calculated by collecting the pressure difference in real time act .

[0020] A flow monitoring unit: An ultrasonic leak detector is used to locate the leakage point based on the time difference method and calculate the leakage rate through the Bernoulli equation.

[0021] A temperature acquisition unit: A thermocouple array (type K) is distributed in the cabin interlayer (spacing 20 cm) and the pipeline insulation layer (every 50 cm), and T is collected at a period of 100 ms act and the temperature gradient.

[0022] Data processing: The signals of each sensor are converted into digital signals by a 24-bit ADC, an additional millisecond-level time stamp is added, and they are transmitted to the dynamic modeling module through the CAN bus.

[0023] This system realizes the intelligent control of oxygen supply in the oxygen chamber through the collaborative work of four modules. First, the data acquisition module obtains key environmental parameters, which are the basis for subsequent modeling and evaluation. The dynamic modeling module uses the parameters to construct a field variable matrix, quantifies the dynamic change of oxygen viscosity, and provides core parameters for resistance calculation. The stability evaluation module judges whether the oxygen supply is stable by calculating the resistance and the deviation index, and decides whether to trigger compensation. The closed-loop compensation module adjusts the air pressure and the leakage amount according to the evaluation results, and feeds back the compensated results to the modeling module to optimize the model parameters, forming a closed-loop control.

[0024] See Figure 2 , Figure 2 For the logic block diagram of the data acquisition module, the data acquisition module includes: A pressure sensing unit is installed at the inlet and outlet ends of the main oxygen supply pipeline of the oxygen chamber, and the actual air pressure value of the oxygen chamber is collected in real time through a differential pressure transmitter; A flow monitoring unit uses an ultrasonic leak detector to locate the leak point in the oxygen chamber pipeline based on the time difference method, and calculates the leak rate of the oxygen chamber pipeline through the Bernoulli equation; A temperature acquisition unit includes a thermocouple array distributed in the interlayer of the oxygen chamber hull and the insulation layer of the oxygen supply pipeline, and obtains the internal temperature value of the oxygen chamber and the temperature gradient of the pipeline wall surface according to a preset sampling period; Among them, the output signals of the pressure sensing unit, the flow monitoring unit and the temperature acquisition unit all generate environmental parameters including time stamps through an analog-to-digital conversion module, and are input into the dynamic modeling module.

[0025] The data acquisition module collects air pressure, leak rate and temperature data through three types of sensors respectively. The pressure sensing unit measures the pressure difference at both ends of the pipeline using a differential pressure transmitter to obtain the actual air pressure value, which is used to analyze the influence of air pressure on oxygen viscosity. The flow monitoring unit locates the leak point through the ultrasonic time difference method, and then calculates the leak rate using the Bernoulli equation to monitor the pipeline sealing state. The temperature acquisition unit obtains the cabin temperature and the pipeline temperature gradient through the thermocouple array, which is used for the correction calculation of viscosity by temperature. All data are converted through analog-to-digital conversion to generate a data set with time stamps to ensure the time synchronization of the data and provide accurate input for dynamic modeling.

[0026] The dynamic modeling module includes: A multi-field data fusion unit is used to convert the actual air pressure value P of the oxygen chamber act , the leak rate Q of the oxygen chamber pipeline leaK、 , the internal temperature value T of the oxygen chamber act and the temperature gradient of the pipeline wall surface into a dimensionless field variable matrix; A viscosity correction calculation unit is used to perform the following calculation operations based on the field variable matrix: (a) Extract the temperature gradient data from the field variable matrix and generate a temperature correction coefficient through a temperature-viscosity relationship model; (b) Extract the air pressure data from the field variable matrix and obtain the air pressure influence factor based on the mapping relationship between air pressure and gas density; (c) Extract the leak rate of the oxygen chamber pipeline from the field variable matrix, and combine the temperature correction coefficient and the air pressure influence factor to calculate the dynamic viscosity correction parameter through a weighted model : ; 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 leak rate of the oxygen chamber; P act : the actual air pressure value of the oxygen chamber, collected in real time through a differential pressure sensor, Q leaK: Leakage rate of the oxygen chamber pipeline, calculated by an ultrasonic leak detector, T act : Internal temperature value of the oxygen chamber, collected by a thermocouple array, P0 is the standard atmospheric pressure, and T0 is the standard temperature; The formula is derived based on the Sutherland equation and the gas state equation, describing the non-linear effect of air pressure on the viscosity of oxygen; Dynamic viscosity correction parameter μ mod Synchronously input to the stability evaluation module and the closed-loop compensation module.

[0027] The oxygen chamber material-gas coupling coefficient is a set of constants calibrated through experiments, reflecting the non-linear effect of oxygen chamber sealing materials (such as silica gel and fluororubber) on the viscosity of oxygen, including the air pressure sensitivity coefficient, leakage influence coefficient, temperature sensitivity coefficient, and non-linear index.

[0028] Composition and symbols: k1: Air pressure sensitivity coefficient, with the unit of , describing the influence intensity of unit air pressure change on the viscosity of oxygen.

[0029] k2: Leakage influence coefficient, dimensionless, describing the maximum correction ratio of leakage rate to the viscosity of oxygen.

[0030] k 3： Temperature sensitivity coefficient, with the unit of , describing the influence intensity of unit temperature change on the viscosity of oxygen.

[0031] : Non-linear index, dimensionless, reflecting the acceleration effect of leakage rate on viscosity under high-pressure environment (such as n = 2.5). By fitting the leakage data of high-pressure oxygen chambers (working pressure 200 - 400 kPa), it is determined that the model has the highest accuracy when the non-linear index n = 2.5.

[0032] The above coefficients are directly involved in the calculation of the dynamic viscosity correction parameter, determining the output result of the dynamic viscosity correction parameter.

[0033] The dynamic modeling module first converts multi-source data into a dimensionless field variable matrix to eliminate the influence of dimensional 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 non-linear 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 synthesizes three types of factors and outputs the corrected viscosity value, providing a key parameter for resistance calculation. Dimensionless range: P act (0 - 1 corresponds to 100 - 400 kPa), Q leaK (0 - 1 corresponds to 0 - 0.5 L / min), Tact Generate a 3×10 matrix (10 samples per second) at (0 - 1 corresponding to 18 - 28 °C).

[0034] Viscosity correction calculation unit Temperature correction: Simplified based on the Sutherland formula, where k3 = 0.02 in 1 - k3(T act - 25), e.g., At a certain temperature in °C, the correction factor = 1 - 0.02×5 = 0.9, : Temperature sensitivity coefficient, unit °C -1 , describing the proportional impact of a 1 °C change in temperature on viscosity; : Standard temperature, 25 °C (298 K).

[0035] Atmospheric pressure correction: , when , kPa -1 , : Standard atmospheric pressure, 101.325 kPa, then the influence factor = 2.68, : Atmospheric pressure sensitivity coefficient, unit kPa -1 , describing the impact of a 1 kPa change in atmospheric pressure on viscosity; Leakage correction , if , the correction term = 1 + 0.8×(0.2)^2.5 ≈ 1 + 0.8×0.089 ≈ 1.071.

[0036] Among them, : Leakage influence coefficient, dimensionless, describing the maximum correction ratio of the leakage rate on viscosity; : Maximum allowable leakage rate, unit L / min, specified by the GB standard (e.g., 0.5 L / min); : Leakage rate of the oxygen chamber pipeline, calculated by an ultrasonic leak detector; : Non - linear exponent, dimensionless, reflecting the accelerating effect of leakage influence under high pressure (e.g., n = 2.5).

[0037] Comprehensive calculation: .

[0038] The stability evaluation module includes: Resistance calculation unit, based on the dynamic viscosity correction parameter 、geometric parameters of the oxygen supply pipeline in the oxygen chamber (inner diameter of the oxygen supply pipeline 、length of the oxygen supply pipeline and the number of elbows) and the actual oxygen flow rate , calculate the actual oxygen supply resistance value : ; Among them, is the pressure drop of the oxygen chamber pipeline, in Pa, measured by a differential pressure sensor; : Inner diameter of the oxygen supply pipeline; : Length of the oxygen supply pipeline; is the dynamic viscosity correction parameter; Calculate the actual oxygen supply resistance value The formula is derived based on the Hagen-Poiseuille equation, applicable to the laminar flow state, and calculates the resistance per unit length.

[0039] The offset index generation unit is used to generate an oxygen flow offset index based on the preset target oxygen supply resistance value , the preset target oxygen flow rate and the actual oxygen supply resistance value : ; Among them, : Actual oxygen flow rate, in L / min, monitored by a mass flow meter; : Target oxygen flow rate, in L / min, input by the doctor's order system; is the actual oxygen supply resistance value; is the oxygen flow offset index; is the target oxygen supply resistance value; The offset index quantifies the total deviation degree of resistance and flow rate through absolute value summation.

[0040] And trigger a hierarchical compensation strategy according to the oxygen flow offset index : : Determine that the oxygen supply is stable and do not trigger compensation; : Send a micro-compensation instruction to the closed-loop compensation module; : Send an emergency compensation instruction to the closed-loop compensation module.

[0041] The stability assessment module first calculates the actual oxygen supply resistance value based on the dynamic viscosity, pipeline geometric parameters, and actual oxygen flow rate. The pipeline pressure drop reflects the energy loss of oxygen flow. The inner diameter and length of the pipeline affect the resistance magnitude, and the dynamic viscosity correction parameter reflects the influence of environmental changes. The oxygen flow deviation index comprehensively evaluates the stability through the relative deviation of resistance and flow rate. The classification thresholds (such as 0.05, 0.10) correspond to the clinically acceptable fluctuation range, triggering different compensation strategies to ensure treatment safety.

[0042] The closed-loop compensation module includes: A strategy decision unit for generating a dual-channel compensation strategy: a pressure compensation value and a leakage compensation value according to the comparison result of the oxygen flow deviation index and a preset compensation trigger threshold; (a) Pressure compensation value : ; Where: : The pressure compensation weight coefficient, with the unit of Pa·s / N, adjusting the compensation intensity (such as α = 0.5); is the preset target oxygen supply resistance value is the actual oxygen supply resistance value; is the length of the oxygen supply pipeline of the oxygen chamber; is the inner diameter of the oxygen supply pipeline of the oxygen chamber; is the dynamic viscosity correction parameter; The formula calculates the required air pressure adjustment amount by backtracking the resistance deviation, which is directly proportional to the length of the oxygen supply pipeline and inversely proportional to the inner diameter and viscosity of the oxygen supply pipeline.

[0043] When the actual oxygen supply resistance value is lower than the preset target oxygen supply resistance value, the intake pressure of the pressure servo valve group is increased proportionally to enhance 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, it drives the seal to block the leakage point, and the actual oxygen supply resistance value after compensation is fed back to the dynamic modeling module.

[0044] (b) Leakage compensation value : ; : The leakage compensation weight coefficient, with the unit of L / min·s, adjusting the compensation accuracy (such as β = 2); : is the safety leakage threshold, with the unit of L / min; is the air leakage rate of the oxygen chamber pipeline, calculated by an ultrasonic leak detector; is the actual air pressure value of the oxygen chamber, collected in real time by a differential pressure sensor; P0 is the standard atmospheric pressure; k4: High-pressure amplification index, dimensionless, describing the non-linear effect of air pressure on air leakage compensation (e.g., k4 = 1.2).

[0045] The closed-loop compensation module performs dual-channel compensation according to the offset index: air pressure compensation corrects the resistance deviation directly by adjusting the opening of the air inlet pressure valve; air leakage compensation reduces the air leakage rate of the pipeline by driving the deformation of the seal.

[0046] The weight coefficients (α, β, k4) in the compensation formula are set through experiments to ensure the compensation accuracy and response speed. The servo valve group and the 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 updated iteratively to make the model adapt to equipment aging or environmental changes.

[0047] (a) The air pressure servo valve group, according to adjusts the opening of the air inlet pressure valve of the oxygen chamber; (b) The pipeline seal adjustment mechanism, according to drives the deformation of the seal to compensate for the air leakage rate; The actual oxygen supply resistance value after compensation is fed back to the dynamic modeling module for updating the oxygen chamber material-gas coupling coefficient .

[0048] The air pressure servo valve group: such as the Festo MPYE series, according to adjusts the valve opening with an accuracy of 0.1%; The pipeline seal adjustment mechanism: such as an electric rubber sealing ring, according to adjusts the deformation to reduce the leakage hole area.

[0049] The strategy decision-making unit; the actual oxygen supply resistance value after compensation is fed back to the dynamic modeling module for updating the oxygen chamber material-gas coupling relationship through the following steps: (a) Compare the deviation between the actual oxygen supply resistance value after compensation and the target oxygen supply resistance value to generate a resistance error amount; (b) Adjust the oxygen chamber material-gas coupling coefficient weight distribution rule in the viscosity correction calculation unit based on the resistance error amount; (c) Apply the updated oxygen chamber material-gas coupling coefficient weight distribution rule to the dimensionless calculation of the subsequent field variable matrix.

[0050] 1. Deviation comparison: The actual oxygen supply resistance value after compensation is recalculated by the pressure sensing unit. If the target value is 20,000 and the value after compensation is 19,800, then the resistance error amount .

[0051] The resistance error amount , where is the actual resistance value after compensation and is used to evaluate the compensation effect.

[0052] Oxygen chamber material - gas coupling coefficient adjustment: Taking as an example, calculate the other terms of the partial derivative: ; Among them, is the actual oxygen supply resistance value; k1: air pressure sensitivity coefficient, with the unit of , describing the influence intensity of unit air pressure change on oxygen viscosity; is the pressure drop of the oxygen chamber pipeline; : is the inner diameter of the oxygen supply pipeline; : is the length of the oxygen supply pipeline; μ0 is the standard oxygen viscosity; P act : the actual air pressure value of the oxygen chamber; P0 is the standard atmospheric pressure; C: is the other terms in the dynamic viscosity correction parameter formula that have nothing to do with K1 and are used to isolate the influence of a single coefficient on the resistance. The specific expression: ; Taking as , then: ; Among them is the corrected air pressure sensitivity coefficient, and E is the resistance error amount; Thus, the corrected air pressure sensitivity coefficient is obtained.

[0053] Adjust the weight of based on the error amount, through the gradient descent method:

[0054] : iteration step coefficient, dimensionless (such as γ = 0.02), controlling the update amplitude of the coefficient to avoid oscillation; : partial derivative of the resistance with respect to the oxygen chamber material - gas coupling coefficient, reflecting the influence degree of coefficient change on the resistance; Updated For the dimensionless calculation of the next field variable matrix, for example After adjustment, the air pressure influence factor Will change accordingly to achieve model self - adaptation. The adjusted coefficient is used for the dimensionless processing of the field variable matrix, such as recalculating the air pressure influence factor , making the model more suitable for the actual working conditions.

[0055] By adjusting the opening degree of the air inlet end of the air pressure servo valve group to change the supply air pressure, adding the air pressure compensation value to the detected oxygen cabin pipeline pressure drop, the compensated oxygen cabin pipeline pressure drop is obtained. The compensated actual oxygen supply resistance value is calculated based on the compensated oxygen cabin pipeline pressure drop, the geometric parameters of the oxygen supply pipeline of the oxygen cabin, and the dynamic viscosity correction parameter.

[0056] By adjusting the opening degree of the air pressure servo valve group of the main oxygen supply pipeline to change the supply air pressure, it directly affects the oxygen cabin pipeline pressure drop .

[0057] Compensation equation: ; Among them, Is the compensated oxygen cabin pipeline pressure drop; Is the oxygen cabin pipeline pressure drop; Is the air pressure compensation value; Substitute the actual oxygen supply resistance value Calculation formula: ; For every 1 kPa 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; Among them: Is the compensated actual resistance value; : Is the oxygen cabin pipeline pressure drop; : Is the air pressure compensation value; : Is the inner diameter of the oxygen supply pipeline; : Is the length of the oxygen supply pipeline; 2. Leakage compensation: Principle of action: By deforming the sealing mechanism to reduce the leakage rate ( Key input), indirectly reducing the dynamic viscosity fluctuation.

[0058] Leakage correction: ; Among them: : The leakage rate of the compensated oxygen cabin pipeline; : The leakage rate of the oxygen cabin pipeline; : The leakage compensation value; Effect on viscosity: Update the dynamic viscosity calculation: ; Among them, : The corrected dynamic viscosity parameter; μ0 is the standard oxygen viscosity; k1, k2, k3, n are the oxygen cabin material-gas coupling coefficients; Q max : The maximum allowable leakage rate of the oxygen cabin; P act : The actual air pressure value of the oxygen cabin, collected in real time by a differential pressure sensor; Q leaK : The leakage rate of the oxygen cabin pipeline, calculated by an ultrasonic leak detector; T act : The internal temperature value of the oxygen cabin, collected by a thermocouple array, P0 is the standard atmospheric pressure, and T0 is the standard temperature; : The change in air pressure inside the oxygen cabin, the difference between the actual air pressure value of the oxygen cabin and the standard atmospheric pressure; : The maximum allowable leakage rate of the oxygen cabin pipeline, which is a set threshold used to define the reasonable range of the leakage situation; : The change in temperature inside the oxygen cabin, the difference between the internal temperature value of the oxygen cabin and the standard temperature; The leakage rate is reduced by 0.1 L / min, and the viscosity fluctuation is reduced by 15%-20%.

[0059] Obtain the actual oxygen supply resistance value after compensation: ; Among them: : The corrected actual oxygen supply resistance value; : The pressure drop of the oxygen cabin pipeline; : The inner diameter of the oxygen supply pipeline; : The length of the oxygen supply pipeline; : The corrected dynamic viscosity parameter.

[0060] And feedback the actual oxygen supply resistance value after compensation to the dynamic modeling module to dynamically adjust the oxygen cabin material-gas coupling coefficient in the calculation formula of the dynamic viscosity correction parameter.

[0061] The deviation between the compensated resistance value and the target value is used to update the model coefficients. First, calculate the resistance error amount, and then adjust the weight of the oxygen chamber material-gas coupling coefficient in the viscosity correction model according to the error. By adjusting the weight distribution rule, the model output can be closer to the actual resistance value. The updated coefficients are applied to subsequent data processing to achieve the adaptive optimization of the model, ensure the control accuracy of the system during long-term operation, and adapt to the aging of the oxygen chamber material or the change of environmental parameters.

[0062] The above content is only an example and illustration of the concept of the present invention. Those skilled in the art of this technology can make various modifications, supplements, or use similar methods to replace the specific embodiments described, as long as they do not deviate from the concept of the invention or exceed the scope defined by the present invention, they should fall within the protection scope of the present invention.

Claims

1. An intelligent control system for a medical gas device, characterized in that, include: A data acquisition module is used to obtain the oxygen chamber service environment parameters, which include the actual air pressure value of the oxygen chamber, the leakage rate of the oxygen chamber pipeline, the internal temperature value of the oxygen chamber 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, for calculating the actual oxygen supply resistance value using the dynamic viscosity correction parameter, and generating an oxygen flow deviation index by combining a preset target oxygen supply resistance value and the actual oxygen flow rate; A closed-loop compensation module is used to execute a dual-channel compensation strategy according to 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, and feed the compensated actual oxygen supply resistance value 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 regulates 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, and drives the sealing element to compensate for the leakage rate according to the leakage compensation value.

2. The intelligent control system for a gas medical device 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 air supply main pipeline, 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 leak rate of the oxygen chamber pipeline through the Bernoulli equation; The temperature acquisition unit includes a thermocouple array distributed in the interlayer of the oxygen chamber and the insulation layer of the oxygen supply pipeline, and obtains the internal temperature value of the oxygen chamber and the temperature gradient of the pipeline wall according to a preset sampling period; Among them, the output signals of the pressure sensing unit, the flow monitoring unit and the temperature acquisition unit are all converted into environmental parameters including timestamps through the analog-to-digital conversion module and input into the dynamic modeling module.

3. The intelligent control system for a gas medical device according to claim 2, wherein The dynamic modeling module includes: The multi-field data fusion unit is used to convert the actual air pressure value of the oxygen chamber, the leakage rate of the oxygen chamber pipeline, the internal temperature value of the oxygen chamber and the temperature gradient of the pipeline wall 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) Extract temperature gradient data from the field variable matrix and generate temperature correction coefficients through 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 leakage rate of the oxygen chamber pipeline from the field variable matrix, combine the temperature correction coefficient and the air pressure influence factor, and calculate the dynamic viscosity correction parameter through the weighted model : ； wherein is the standard oxygen viscosity, is the oxygen chamber material-gas coupling coefficient, is the maximum allowable air leakage rate of the oxygen chamber; is the actual air pressure value of the oxygen chamber, which is collected in real time by a differential pressure sensor, is the air leakage rate of the oxygen chamber pipeline, which is calculated by an ultrasonic leak detector, is the internal temperature value of the oxygen chamber, which is collected by a thermocouple array, is the standard atmospheric pressure, is the standard temperature; The dynamic viscosity correction parameter is synchronously input into the stability evaluation module and the closed-loop compensation module.

4. The intelligent control system for a gas medical device according to claim 3, wherein, 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; An offset index generation unit for generating an oxygen flow offset index according to a preset target oxygen supply resistance value, a preset target oxygen flow rate, and an actual oxygen supply resistance value , and triggering a hierarchical compensation strategy according to the oxygen flow offset index : : It is determined that the oxygen supply is stable and the compensation is not triggered; : Send a micro-compensation instruction to the closed-loop compensation module; : Send an emergency compensation instruction 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 first, and then suppress the leakage source with air leakage compensation.

5. The intelligent control system for a gas medical device according to claim 4, wherein The closed-loop compensation module also includes: A strategy decision-making unit for generating a dual-channel compensation strategy: a pressure compensation value and a leakage compensation value based on the comparison result between the oxygen flow deviation index and a preset compensation trigger threshold; When the actual oxygen supply resistance value is lower than the preset target oxygen supply resistance value, the intake pressure of the pneumatic servo valve group is increased proportionally to enhance 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, it drives the seal to block the leakage point, and the compensated actual oxygen supply resistance value is fed back to the dynamic modeling module.

6. The intelligent control system for a gas medical device according to claim 5, characterized in that, 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: Comparing the compensated actual oxygen supply resistance value with the target oxygen supply resistance value to generate a resistance error amount; Adjusting the weight distribution rule of the oxygen chamber material-gas coupling coefficient based on the resistance error amount; Applying the updated oxygen chamber material-gas coupling coefficient distribution rule to the dimensionless calculation of the subsequent field variable matrix.

7. An intelligent control system for a gas medical device according to claim 5, characterized in that, By adjusting the opening of the intake end of the pneumatic servo valve group to change the supply pressure, adding the detected oxygen chamber pipeline pressure drop and the pressure compensation value to obtain the compensated oxygen chamber pipeline pressure drop, and calculating the compensated actual oxygen supply resistance value based on the compensated oxygen chamber pipeline pressure drop, the geometric parameters of the oxygen chamber oxygen supply pipeline, and the dynamic viscosity correction parameter.

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