Infusion heating method, device and equipment based on PID (Proportion Integration Differentiation) adjustment and storage medium

Abstract

The invention belongs to the technical field of infusion heating, and discloses an infusion heating method, device and equipment based on PID (Proportion Integration Differentiation) adjustment and a storage medium, and the method comprises the following steps: constructing a temperature conversion model of the temperature of a sensor at a liquid outlet end and the temperature of transmitted liquid; heating the liquid at the liquid outlet end to a pre-heating temperature according to the target heating rate and a temperature conversion model; acquiring a first mapping relation table, and heating the liquid at the liquid outlet end to a target temperature according to the first mapping relation table and a PID algorithm; and a second mapping relation table is obtained, the input condition of the liquid inlet end position and the temperature of the middle position are monitored, and PID adjustment is conducted on the liquid temperature of the liquid outlet end or abnormity reminding is conducted on a user through the second mapping relation table and the temperature conversion model. The heating to the specified temperature is ensured, the working condition change in the heating process can be fed back and processed according to related parameters, the accuracy and stability of the heating process are ensured, the body temperature maintenance of a patient is facilitated, and the sudden change situation occurring in the midway of the steady state can be timely processed.

Description

Technical Field

[0001] This invention relates to the field of infusion heating technology, and in particular to an infusion heating method, apparatus, equipment and storage medium based on PID control. Background Technology

[0002] Blood transfusion and infusion warming devices are mainly used in clinical settings to heat infused fluids without direct contact with the body. Suitable for operating rooms, emergency rooms, and wards, they can warm blood, blood products, medications, nutritional solutions, or flushing solutions from refrigerated or room temperature to a suitable temperature, preventing hypothermia and related complications. They play a particularly important role in critical care, major surgeries, and field hospitals.

[0003] Based on different heating media, existing blood transfusion and infusion warming equipment is divided into two main categories: dry heat warming and circulating water warming. Dry heat warming devices typically use electric heating elements to directly heat the flowing fluid in the transfusion tubing. Circulating water warming devices heat water in a tank through a heating unit; the hot water is then pumped out and circulated through dedicated disposable transfusion tubing, allowing heat exchange between the blood and purified water to achieve warming.

[0004] Existing blood transfusion and infusion warming equipment experiences frequent malfunctions, primarily due to poor warming performance, inability to handle various warming scenarios, and insufficient adaptability to changes in operating conditions during the warming process. Equipment malfunctions leading to overheating of the fluid can cause thermal hemolysis and thermal injury, while insufficient temperature can cause hypothermia in patients, negatively impacting the effectiveness of blood transfusions. Summary of the Invention

[0005] The purpose of this application is to propose an infusion heating method, device, equipment and storage medium based on PID control to solve the problems of poor heating effect and insufficient ability to cope with and adjust to various heating scenarios.

[0006] To address the aforementioned technical problems, this application provides an infusion heating method based on PID control, employing the following technical solution:

[0007] Step 100: Obtain the heating module. Arrange temperature sensors at the inlet, middle, and outlet positions of the heating plate of the heating module. Obtain the length parameters of the heating plate, the distance of each temperature sensor from the inlet of the heating plate, the contact perimeter parameters between the heating plate and the infusion tube, the convective heat transfer coefficient between the heating plate and the infusion tube, and the physical parameters of the transmitted liquid. Construct a temperature conversion model between the sensor temperature at the outlet and the temperature of the transmitted liquid.

[0008] Step 200: In the preheating stage, the heating rate is adjusted to the target heating rate using a PID algorithm, and the liquid temperature at the outlet is heated to the preheating temperature according to the target heating rate and the temperature conversion model.

[0009] Step 300: In the formal heating stage, the temperature conversion model is used to obtain the first mapping relationship table between the initial temperature of the preheating stage, the power consumption corresponding to heating to the preheating temperature, and the liquid temperature at the outlet end through experiments. The liquid temperature at the outlet end is heated to the target temperature according to the first mapping relationship table and the PID algorithm.

[0010] Step 400: During the temperature maintenance phase, obtain a second mapping table of temperatures between the inlet position, the middle position, and the outlet position, and monitor the input conditions of the inlet position and the temperature of the middle position. Use the second mapping table and the temperature conversion model to perform PID adjustment on the outlet liquid temperature or provide anomaly alerts to the user.

[0011] Furthermore, step 100 includes:

[0012] Step 110: Obtain the temperature distribution model of the heating plate at the liquid outlet and the liquid temperature distribution model at the liquid outlet.

[0013] Step 120: Construct the temperature conversion model based on the heating plate temperature distribution model and the liquid temperature distribution model at the liquid outlet.

[0014] Furthermore, step 110 includes:

[0015] Step 111: Obtain the convective heat transfer coefficient between the heating plate and the liquid being transferred, and obtain the heat balance equation at the liquid outlet.

[0016] Step 112: Obtain the length parameters of the temperature sensor at the outlet end from the heating plate inlet, the liquid mass flow rate parameters, the liquid specific heat capacity parameters, and the contact perimeter parameters between the heating plate and the delivery pipe, and obtain the liquid temperature distribution model at the outlet end according to the heat balance equation.

[0017] Furthermore, after step 112, step 110 also includes:

[0018] Step 113: Obtain the temperature difference model between the heating plate and the transmission liquid using the heat balance equation;

[0019] Step 114: Obtain the temperature distribution model of the heating plate at the liquid outlet based on the liquid temperature distribution model and the temperature difference model.

[0020] Furthermore, step 300 includes:

[0021] Step 310: Obtain the first mapping table, and obtain the target temperature and corresponding power consumption from the first mapping table;

[0022] Step 320: Obtain the heating power corresponding to the power consumption, and output the heating power in the form of PWM wave duty cycle, so that the liquid temperature at the outlet reaches the target temperature.

[0023] Furthermore, step 400 includes:

[0024] Step 410: Obtain the second mapping table and monitor the input conditions for the liquid inlet position;

[0025] Step 420: If the change in the input conditions at the liquid inlet position exceeds the specified threshold, the target temperature at the liquid outlet is adjusted using the PID algorithm, and then the PID algorithm is used again to adjust it to a steady state.

[0026] Furthermore, step 400 includes:

[0027] Step 430: Obtain the second mapping table and monitor the temperature at the central location;

[0028] Step 440: If the temperature change at the central location exceeds a specified threshold, an audio-visual alert will be issued to the user.

[0029] To address the aforementioned technical problems, this application also provides an infusion heating device based on PID control, employing the infusion heating method based on PID control described in the first aspect, comprising:

[0030] A construction module is used to obtain temperature sensors arranged at the inlet, middle and outlet positions of the heating plate of the heating module, and to obtain the length parameters of the heating plate, the distance of each temperature sensor from the inlet of the heating plate, the contact perimeter of the heating plate and the infusion pipe, the convective heat transfer coefficient between the heating plate and the infusion pipe and the physical parameters of the liquid being transferred, and to construct a temperature conversion model between the sensor temperature at the outlet and the liquid temperature at the outlet.

[0031] The preheating module is used to adjust the heating rate to the target heating rate using a PID algorithm during the preheating stage, and to heat the liquid temperature at the outlet end to the preheating temperature according to the target heating rate and the temperature conversion model.

[0032] The formal heating module is used to obtain, through experiments, the initial temperature of the preheating stage, the power consumption corresponding to heating to the preheating temperature, and the first mapping relationship table between the liquid temperature at the outlet end and the temperature of the preheating stage using the temperature conversion model during the formal heating stage. Based on the first mapping relationship table and the PID algorithm, the liquid temperature at the outlet end is heated to the target temperature.

[0033] The temperature maintenance module is used to obtain a second mapping table of temperatures between the inlet position, the middle position, and the outlet position during the temperature maintenance phase, monitor the input conditions of the inlet position and the temperature of the middle position, and use the second mapping table and the temperature conversion model to perform PID adjustment of the outlet liquid temperature or provide abnormal reminders to the user.

[0034] To address the aforementioned technical problems, this application also provides a computer device, including a memory and a processor. The memory stores computer-readable instructions, and the processor executes the computer-readable instructions to implement the steps of the PID-based infusion heating method described in the first aspect.

[0035] To address the aforementioned technical problems, embodiments of this application also provide a computer-readable storage medium storing computer-readable instructions, which, when executed by a processor, implement the steps of the PID-based infusion heating method described in the first aspect.

[0036] Compared with the prior art, the embodiments of this application have the following main technical effects: by constructing a temperature conversion model, and using the temperature conversion model to obtain the initial temperature of the preheating stage, the power consumption corresponding to the preheating temperature, and the first mapping relationship table between the liquid temperature at the outlet end and the liquid temperature at the outlet end, as well as the second mapping relationship table between the temperatures at the inlet end position, the middle position, and the outlet end position, it is ensured that the liquid to be infused can be heated to the specified temperature under various working conditions, and the working condition changes during the heating process can be processed according to the feedback of relevant parameters. The heating time is short, and the accuracy and stability of the heating process are ensured, which is beneficial to the maintenance of the body temperature of the infusion patient, and can promptly handle sudden changes that occur in the steady state. Attached Figure Description

[0037] To more clearly illustrate the solutions in this application, the accompanying drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a flowchart of an embodiment of an infusion heating method based on PID control according to this application;

[0039] Figure 2 yes Figure 1 A flowchart of one specific implementation of step 100;

[0040] Figure 3 yes Figure 2A flowchart of a specific implementation method in step 110;

[0041] Figure 4 yes Figure 3 A flowchart of a specific implementation method following step 112;

[0042] Figure 5 yes Figure 1 A flowchart of a specific implementation of step 300;

[0043] Figure 6 yes Figure 1 A flowchart of a specific implementation method in step 400;

[0044] Figure 7 yes Figure 6 A flowchart of a specific implementation method following step 420;

[0045] Figure 8 This is a schematic diagram of an embodiment of an infusion heating device based on PID control according to this application;

[0046] Figure 9 This is a schematic diagram of the structure of a heating module in an infusion heating device based on PID control according to this application;

[0047] Figure 10 This is a PID control diagram of the preheating stage of an infusion heating method based on PID control according to this application;

[0048] Figure 11 This is a PID control diagram of the formal heating stage of an infusion heating method based on PID control according to this application;

[0049] Figure 12 This is a schematic diagram of another embodiment of an infusion heating device based on PID control according to this application;

[0050] Figure 13 This is a schematic diagram of the structure of one embodiment of the computer device according to this application. Detailed Implementation

[0051] The technical solutions of this invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are all within the scope of protection of this invention.

[0052] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings of this application are intended to cover non-exclusive inclusion.

[0054] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0055] The purpose of this application is to propose an infusion heating method, device, equipment and storage medium based on PID control to solve the problems of poor heating effect and insufficient ability to cope with and adjust to various heating scenarios.

[0056] To address the aforementioned technical problems, this application provides an infusion heating method based on PID control, employing the following technical solution: Figure 1 , Figure 1 This is a flowchart of an embodiment of an infusion heating method based on PID control according to this application, including:

[0057] Step 100: Temperature sensors are arranged at the inlet, middle and outlet positions of the heating plate of the heating module. The length parameters of the heating plate, the distance of each temperature sensor from the inlet of the heating plate, the contact perimeter of the heating plate and the infusion pipe, the convective heat transfer coefficient between the heating plate and the infusion pipe and the physical parameters of the liquid being transferred are obtained. A temperature conversion model between the sensor temperature at the outlet and the liquid temperature at the outlet is constructed.

[0058] In one possible embodiment, such as Figure 8 , Figure 8This is a schematic diagram of an embodiment of an infusion heating device based on PID control according to this application; the infusion heating device based on PID control can be implemented as a blood transfusion infusion heating instrument, comprising a heater (heating module), a power connection cable, a battery box, a battery, and a battery charging socket (including a power adapter).

[0059] ① Heater: Includes heating plate, temperature detection and control system. Equipped with LED indicator lights for status and fault information display;

[0060] ② Power connection cable: The battery supplies power to the heater through the power connection cable;

[0061] ③ Battery compartment: The battery compartment contains dedicated batteries that power the heater via a power cable. An indicator light can also be used to indicate low battery levels.

[0062] ④ Battery: Equipped with a dedicated battery. The battery includes a built-in battery control circuit and an LCD display showing the real-time battery level;

[0063] The heating control algorithm of the blood transfusion and infusion warmer is mainly implemented by the built-in control module of the heating plate on the warmer and the main control module built into the front end of the battery box.

[0064] The heating plate module reads the liquid temperature at the inlet, middle, and outlet ends of the plate using temperature sensors, such as... Figure 9 As shown, Figure 9 This is a schematic diagram of the heating module in an embodiment of an infusion heating device based on PID control according to this application. Simultaneously, based on parameters transmitted from the main control board, a PWM wave with a specific duty cycle is calculated and output using a software heating algorithm to control the heating of the internal resistance wire of the heating plate, controlling the output temperature to 38℃ (±2℃). During heating, the temperature sensor reading and heating duty cycle information are fed back to the main control module.

[0065] The main control module collects heating plate temperature data and triggers alarms for high temperature, low temperature, and sensor malfunction based on alarm thresholds; it also collects battery data and triggers low battery alarms based on alarm thresholds. Simultaneously, the main control module sends LED status control commands, current status information, alarm information, battery power information, and heating algorithm calculation results to the heating plate based on the status.

[0066] Because the structure of the heating module is symmetrical on both the upper and lower sides, the entire heating system can be simplified to: heating plate, heat-conducting film, and liquid to be heated on one side.

[0067] In a preferred embodiment, such as Figure 2 , Figure 2 yes Figure 1 A flowchart of a specific implementation of step 100, wherein step 100 includes:

[0068] Step 110: Obtain the temperature distribution model of the heating plate at the liquid outlet and the liquid temperature distribution model at the liquid outlet.

[0069] In a preferred embodiment, such as Figure 3 , Figure 3 yes Figure 2 A flowchart of a specific implementation of step 110; step 110 includes:

[0070] Step 111: Obtain the convective heat transfer coefficient between the heating plate and the liquid being transported, and obtain the heat balance equation at the outlet end; Step 112: Obtain the length parameters of the temperature sensor at the outlet end from the heating plate inlet, the liquid mass flow rate parameters, the liquid specific heat capacity parameters, and the contact perimeter parameters between the heating plate and the delivery pipe, and obtain the liquid temperature distribution model at the outlet end based on the heat balance equation.

[0071] In this embodiment, based on actual operating conditions, it can be assumed that the initial temperature T of the liquid is [temperature value missing] during a single heating process. i and mass flow All values ​​are constant. The total heating power of the resistance wire embedded in the heating plate is Q, and the heating power per unit length is... Where L is the length of the heating plate.

[0072] The temperature sensor at the outlet end is located at the upper part of the plate, near the downstream part of the water flow, at position x = L. s (L s Slightly less than L), the measured temperature is T of the heating plate at that location. sensor .

[0073] The water temperature (liquid temperature at the outlet) at the top of the plate (outlet, position x = L) is T. out According to the simplified system analysis heat transfer model: heat is transferred from the heating plate to the transport liquid through surface convection. The convective heat transfer coefficient h (unit: W / (m³)) 2 Assuming K is constant. The perimeter of the heating plate in contact with the liquid is P (unit: m; for a rectangular plate, if the width is W, then P = W). Neglecting axial heat conduction of the heating plate (assuming good thermal conductivity or small thermal conduction effect), the heat balance per unit length of the plate is: the heating power input equals the convective heat transfer, that is:

[0074] q'=hP(T p (x)-T l (x)) (1),

[0075] Among them, T p (x) is the temperature of the heating plate at position x, T l (x) is the temperature of the liquid being transferred at position x;

[0076] The temperature of the transported liquid increases along the flow direction, and the energy balance equation is:

[0077]

[0078] Where c p It is the specific heat capacity of the liquid (unit: J / (kg·K)).

[0079] Analysis of system temperature distribution:

[0080] Using the heat balance formula for the heating plate, the temperature difference model between the heating plate and the transferred liquid can be obtained as follows:

[0081]

[0082] Where ΔT overheat It is superheat (the temperature difference between the heating plate temperature and the temperature of the liquid being transferred).

[0083] Substituting into the liquid energy equation:

[0084]

[0085] Integrating equation (4), the liquid temperature distribution at the outlet is obtained as follows:

[0086]

[0087] Among them, T in This refers to the temperature of the liquid being transferred at the inlet.

[0088] The liquid temperature distribution model at the outlet (x = L) is:

[0089]

[0090] In a preferred embodiment, after step 112, as Figure 4 , Figure 4 yes Figure 3 A flowchart of a specific implementation method following step 112; step 110 also includes:

[0091] Step 113: Obtain the temperature difference model between the heating plate and the transported liquid using the heat balance equation; Step 114: Obtain the temperature distribution model of the heating plate at the liquid outlet based on the liquid temperature distribution model and the temperature difference model.

[0092] In this embodiment, according to the temperature difference model of equation (3), the sensor reading at the liquid outlet is the same as the temperature distribution model of the heating plate (x = L). s )for:

[0093]

[0094] Step 120: Construct a temperature conversion model based on the temperature distribution model of the heating plate and the liquid temperature distribution model at the outlet.

[0095] T can be obtained sensor With T out The relationship, i.e., the temperature conversion model, is as follows:

[0096]

[0097] The derivation of the above formula (8) is as follows:

[0098] According to formulas (6) and (7), let:

[0099] We can obtain:

[0100]

[0101] Substitution (Depend on Solving for the solution, we get:

[0102] therefore:

[0103] The above formula (8) can be obtained.

[0104] In this embodiment of the application, the parameters are as follows:

[0105] T out Temperature distribution at the liquid outlet.

[0106] T sensor Temperature sensor reading (position x = L) s (plate temperature at the location).

[0107] Geometric parameters:

[0108] L: Length of heating plate (from inlet to outlet, in meters).

[0109] L s : Distance of temperature sensor location from the inlet (unit: m).

[0110] P: Circumference of the heating plate in contact with the liquid (unit: m).

[0111] Physical parameters:

[0112] T in Inlet water temperature (known to be constant).

[0113] Liquid mass flow rate (unit: kg / s; known to be constant).

[0114] c pSpecific heat capacity of liquid (unit: J / (kg·K); known).

[0115] h: Convective heat transfer coefficient between the plate and the liquid (unit: W / (m²)) 2 ·K)).

[0116] In this embodiment, the heating preparation stage includes: initial temperature calibration and power data acquisition.

[0117] Main control module: Upon power-up, it reads the power module parameters, including battery output voltage, output current, and battery percentage information, and then sends the battery information to the heating module via serial port. Heating module: Upon power-up, after confirming successful reception of battery data from the main board, it begins cyclic temperature measurement by the temperature sensors with a 1-second cycle. It records the temperature sensor readings at the inlet, middle, and outlet ends as T1, T2, and T3, respectively. After 3 seconds of measurement, it records the average temperature as the starting temperature for heating.

[0118] Step 200: In the preheating stage, the heating rate is adjusted to the target heating rate using a PID algorithm, and the liquid temperature at the outlet is heated to the preheating temperature based on the target heating rate and the temperature conversion model.

[0119] T sensor With T out If a linear relationship is satisfied, then within the specified time period T... sensor Change in quantity as T out The rate of change. Considering the heating range is from room temperature to 38℃, the target heating rate 101 for the first stage can be determined as +0.5℃ / s, and the preheating temperature for the preheating stage is 33℃. In the actual heating process, the difference in readings of temperature sensor 106 per second is used as the heating rate value. The rate value is adjusted to +0.5℃ / s by PID control 102, and the PID calculation result is output to the heating power control module 103 in the form of PWM wave duty cycle, thereby controlling the heating wire 104 to heat the liquid through the heating zone 105. When the temperature sensor reading at the liquid outlet reaches 33℃, the preheating stage ends. The preheating stage process is as follows: Figure 10 As shown, Figure 10 This is a PID control diagram of the preheating stage of an infusion heating method based on PID control according to this application.

[0120] Step 300: In the formal heating stage, the temperature conversion model is used to obtain the first mapping relationship table between the initial temperature of the preheating stage, the power consumption corresponding to heating to the preheating temperature, and the liquid temperature at the outlet end through experiments. Based on the first mapping relationship table and the PID algorithm, the liquid temperature at the outlet end is heated to the target temperature.

[0121] In a preferred embodiment, such as Figure 5 , Figure 5 yes Figure 1A flowchart of a specific implementation of step 300; step 300 includes:

[0122] Step 310: Obtain the first mapping relationship table, and obtain the target temperature and corresponding power consumption from the first mapping relationship table; Step 320: Obtain the heating power corresponding to the power consumption, and output the heating power in the form of PWM wave duty cycle, so that the liquid temperature at the outlet reaches the target temperature.

[0123] In this embodiment, during the pre-heating stage, the battery output voltage and current values ​​are recorded when the temperature sensor reading at the liquid outlet is in the range of 25-33°C. The product of the voltage and current values ​​is integrated to obtain the heating power required to heat from 25°C to 33°C under the current operating conditions of the device. Let the initial temperature calibrated during the preheating stage be Ti, and the power consumption value between 25-33°C be Wi. Through analysis, it can be seen that in order to achieve a liquid temperature of 38°C (±2°C) at the liquid outlet, the plate needs to reach different target temperatures depending on the initial liquid temperature and flow rate. The initial liquid temperature and liquid flow rate can be calibrated by measuring Ti and Wi, and the corresponding target temperatures can be obtained through experiments. Thus, the first mapping relationship table between Ti, Wi, and the target temperature of the corresponding final liquid outlet temperature sensor can be obtained. In the normal operating procedure, at the start of the formal heating stage, the target temperature value T0 under the current state is obtained by looking up the first mapping relationship table 201 according to Ti and Wi. Then, the PID control 202 is used to make the temperature measured by the temperature sensor 206 at the liquid outlet reach T0. The PID calculation result is output to the heating power control module 203 in the form of PWM wave duty cycle. The formal heating stage process is as follows: Figure 11 , Figure 11 This is a PID control diagram of the formal heating stage of an infusion heating method based on PID control according to this application.

[0124] Step 400: During the temperature maintenance phase, obtain the second mapping relationship table of temperatures between the inlet position, the middle position, and the outlet position, and monitor the input conditions of the inlet position and the temperature of the middle position. Use the second mapping relationship table and the temperature conversion model to perform PID adjustment on the outlet liquid temperature or provide abnormal reminders to the user.

[0125] In a preferred embodiment, such as Figure 6 , Figure 6 yes Figure 1 A flowchart of a specific implementation of step 400; step 400 includes:

[0126] Step 410: Obtain the second mapping table and monitor the input conditions of the liquid inlet position; Step 420: If the change of the input conditions of the liquid inlet position exceeds the specified threshold, adjust the target temperature of the liquid outlet using the PID algorithm and readjust it to a steady state using the PID algorithm.

[0127] In this embodiment, when the formal heating phase of the equipment ends, for the outlet temperature sensor temperature Tout301 under the current stable condition, there should be a corresponding inlet temperature sensor temperature Tin and a middle temperature sensor temperature Tmid302. The second mapping relationship table 303 between Tout and Tin, Tmid can then be experimentally calibrated. When Tout stabilizes, monitoring Tin and Tmid adjusts the equipment's operating status. The specific workflow is as follows: Figure 7 As shown.

[0128] Tin: When the change in Tin exceeds the set threshold, the device determines that the current input conditions (inlet temperature, flow rate) have changed significantly. Therefore, it adjusts the target temperature of Tout to 304 according to the mapping table and readjusts it to steady state 305 through PID control.

[0129] In a preferred embodiment, such as Figure 7 , Figure 7 yes Figure 6 A flowchart of a specific implementation following step 420; step 400 includes:

[0130] Step 430: Obtain the second mapping table and monitor the temperature at the central location; Step 440: If the temperature change at the central location exceeds the specified threshold, issue an audio-visual alert to the user.

[0131] In this embodiment, when the Tmid temperature rises abnormally, it is determined that there may be abnormal infusion conditions such as air bubbles or uneven flow distribution in the current infusion line. The device will promptly issue an audible and visual alert to remind the user to check the current infusion status. When the Tmid temperature drops abnormally, it is determined that there may be abnormal equipment conditions such as blockage or abnormal operation of the resistance wire in the infusion line. The device will promptly issue an audible and visual alert to remind the user to check the current equipment status.

[0132] In this embodiment of the application, a temperature conversion model is constructed, and a first mapping relationship table between the initial temperature of the preheating stage, the power consumption corresponding to the preheating temperature, and the liquid temperature at the outlet end is obtained using the temperature conversion model. A second mapping relationship table between the temperatures at the inlet end position, the middle position, and the outlet end position is also obtained. This ensures that the liquid to be infused can be heated to the specified temperature under various operating conditions, and can handle changes in operating conditions during the heating process based on relevant parameters. The heating time is short, and the accuracy and stability of the heating process are ensured, which is beneficial to maintaining the body temperature of the infusion patient and can promptly handle sudden changes that occur during the steady state.

[0133] To address the aforementioned technical problems, this application also provides an infusion heating device based on PID control, employing the infusion heating method based on PID control from the first aspect, such as... Figure 12 , Figure 12 This is a schematic diagram of another embodiment of an infusion heating device based on PID control according to this application; including:

[0134] Module 501 is used to obtain temperature sensors arranged at the inlet, middle and outlet positions of the heating plate of the heating module, and to obtain the length parameters of the heating plate, the distance of each temperature sensor from the inlet of the heating plate, the contact perimeter of the heating plate and the infusion pipe, the convective heat transfer coefficient between the heating plate and the infusion pipe and the physical parameters of the liquid being transferred, and to construct a temperature conversion model between the temperature of the sensor at the outlet and the temperature of the liquid at the outlet.

[0135] The preheating module 502 is used to adjust the heating rate to the target heating rate using a PID algorithm during the preheating stage, and to heat the liquid temperature at the outlet to the preheating temperature according to the target heating rate and the temperature conversion model.

[0136] The formal heating module 503 is used to obtain, through experiments and a temperature conversion model, the initial temperature of the preheating stage, the power consumption corresponding to heating to the preheating temperature, and the first mapping relationship table between the liquid temperature at the outlet end and the liquid temperature during the formal heating stage. Based on the first mapping relationship table and the PID algorithm, the liquid temperature at the outlet end is heated to the target temperature.

[0137] The temperature maintenance module 504 is used to obtain a second mapping table of temperatures between the inlet position, the middle position, and the outlet position during the temperature maintenance phase, and to monitor the input conditions of the inlet position and the temperature of the middle position. It uses the second mapping table and the temperature conversion model to perform PID adjustment of the outlet liquid temperature or to provide abnormal reminders to the user.

[0138] To address the aforementioned technical problems, this application also provides a computer device, including a memory and a processor. The memory stores computer-readable instructions, and the processor executes the computer-readable instructions to implement the steps of the PID-based infusion heating method of the first aspect.

[0139] This computer device can be a computer, server, workstation, or other similar device; it can also be a mobile device such as a mobile phone, tablet, or in-vehicle mobile terminal; or other devices with program execution capabilities. Its internal structure diagram can be as follows: Figure 13 As shown, Figure 13This is a schematic diagram of a computer device according to an embodiment of the present application. The computer device includes a processor, a memory, and a network module. The processor provides computing and control capabilities. The memory includes non-volatile and / or volatile storage media and internal memory. The non-volatile storage media stores an operating system, instructions, or code. The internal memory provides an environment for the operation of the operating system and instructions or code in the non-volatile storage media. When the instructions or code are executed by the processor, they implement the functions or steps of a PID-based infusion heating method. The network module of the computer device may include a network interface and / or a wireless network module, allowing the computer device to communicate with other devices or service platforms. Furthermore, the computer device may also include a display screen and input devices, etc.

[0140] The memory is used to store computer programs, which include program instructions. The processor is configured to call the program instructions, and when the processor executes the instructions or code, it implements the steps of the PID-based infusion heating method described above.

[0141] To address the aforementioned technical problems, embodiments of this application also provide a computer-readable storage medium storing computer-readable instructions. When executed by a processor, the computer-readable instructions implement the steps of the PID-based infusion heating method as described in the first aspect.

[0142] The computer-readable storage medium stores a computer program, which includes program instructions that are implemented when executed by a processor. Figures 1 to 7 The infusion heating method based on PID control provided in each step can be found in the implementation methods provided in the above steps, and will not be repeated here.

[0143] The aforementioned computer-readable storage medium may be the apparatus of the document generation method provided in any of the foregoing embodiments or the internal storage unit of the aforementioned terminal device, such as the hard disk or memory of a computer device. The computer-readable storage medium may also be an external storage device of the computer device, such as a plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, etc., provided on the computer device.

[0144] Furthermore, the computer-readable storage medium may include both internal storage units and external storage devices of the computer device. The computer-readable storage medium is used to store the computer program and other programs and data required by the computer device. The computer-readable storage medium can also be used to temporarily store data that has been output or will be output.

[0145] However, it should be understood that it is not required to implement all the components shown; more or fewer components may be implemented instead. Those skilled in the art will understand that the computer device described herein is a device capable of automatically performing numerical calculations and / or information processing according to pre-set or stored instructions, and its hardware includes, but is not limited to, microprocessors, application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), digital signal processors (DSPs), embedded devices, etc.

[0146] The computer device can be a desktop computer, laptop, handheld computer, or cloud server, etc. The computer device can interact with the user via a keyboard, mouse, remote control, touchpad, or voice control.

[0147] Compared with the prior art, the embodiments of this application have the following main technical effects: by constructing a temperature conversion model, and using the temperature conversion model to obtain the initial temperature of the preheating stage, the power consumption corresponding to the preheating temperature, and the first mapping relationship table between the liquid temperature at the outlet end and the liquid temperature at the outlet end, as well as the second mapping relationship table between the temperatures at the inlet end position, the middle position, and the outlet end position, it is ensured that the liquid to be infused can be heated to the specified temperature under various working conditions, and the working condition changes during the heating process can be processed according to the feedback of relevant parameters. The heating time is short, and the accuracy and stability of the heating process are ensured, which is beneficial to the maintenance of the body temperature of the infusion patient, and can promptly handle sudden changes that occur in the steady state.

[0148] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for infusion heating based on PID control, characterized in that it includes: Step 100: Obtain the heating module. Arrange temperature sensors at the inlet, middle, and outlet positions of the heating plate of the heating module. Obtain the length parameters of the heating plate, the distance of each temperature sensor from the inlet of the heating plate, the contact perimeter parameters between the heating plate and the infusion tube, the convective heat transfer coefficient between the heating plate and the infusion tube, and the physical parameters of the transmitted liquid. Construct a temperature conversion model between the sensor temperature at the outlet and the temperature of the transmitted liquid. Step 200: In the preheating stage, the heating rate is adjusted to the target heating rate using a PID algorithm, and the liquid temperature at the outlet is heated to the preheating temperature according to the target heating rate and the temperature conversion model. Step 300: In the formal heating stage, the temperature conversion model is used to obtain the first mapping relationship table between the initial temperature of the preheating stage, the power consumption corresponding to heating to the preheating temperature, and the liquid temperature at the outlet end through experiments. The liquid temperature at the outlet end is heated to the target temperature according to the first mapping relationship table and the PID algorithm. Step 400: During the temperature maintenance phase, obtain a second mapping table of temperatures between the inlet position, the middle position, and the outlet position, and monitor the input conditions of the inlet position and the temperature of the middle position. Use the second mapping table and the temperature conversion model to perform PID adjustment on the outlet liquid temperature or provide anomaly alerts to the user.

2. The PID regulation based infusion warming method of claim 1, wherein, Step 100 includes: Step 110: Obtain the temperature distribution model of the heating plate at the liquid outlet and the liquid temperature distribution model at the liquid outlet. Step 120: Construct the temperature conversion model based on the heating plate temperature distribution model and the liquid temperature distribution model at the liquid outlet.

3. The infusion heating method based on PID control according to claim 2, characterized in that, Step 110 includes: Step 111: Obtain the convective heat transfer coefficient between the heating plate and the liquid being transferred, and obtain the heat balance equation at the liquid outlet. Step 112: Obtain the length parameters of the temperature sensor at the outlet end from the heating plate inlet, the liquid mass flow rate parameters, the liquid specific heat capacity parameters, and the contact perimeter parameters between the heating plate and the delivery pipe, and obtain the liquid temperature distribution model at the outlet end according to the heat balance equation.

4. The infusion heating method based on PID control according to claim 3, characterized in that, After step 112, step 110 further includes: Step 113: Obtain the temperature difference model between the heating plate and the transmission liquid using the heat balance equation; Step 114: Obtain the temperature distribution model of the heating plate at the liquid outlet based on the liquid temperature distribution model and the temperature difference model.

5. The infusion heating method based on PID control according to claim 1, characterized in that, Step 300 includes: Step 310: Obtain the first mapping table, and obtain the target temperature and corresponding power consumption from the first mapping table; Step 320: Obtain the heating power corresponding to the power consumption, and output the heating power in the form of PWM wave duty cycle, so that the liquid temperature at the outlet reaches the target temperature.

6. The infusion heating method based on PID control according to claim 1, characterized in that, Step 400 includes: Step 410: Obtain the second mapping table and monitor the input conditions for the liquid inlet position; Step 420: If the change in the input conditions at the liquid inlet position exceeds the specified threshold, the target temperature at the liquid outlet is adjusted using the PID algorithm, and then the PID algorithm is used again to adjust it to a steady state.

7. The infusion heating method based on PID control according to claim 1, characterized in that, Step 400 includes: Step 430: Obtain the second mapping table and monitor the temperature at the central location; Step 440: If the temperature change at the central location exceeds a specified threshold, an audio-visual alert will be issued to the user.

8. An infusion heating device based on PID control, employing the infusion heating method based on PID control as described in any one of claims 1-7, characterized in that, include: A construction module is used to obtain temperature sensors arranged at the inlet, middle and outlet positions of the heating plate of the heating module, and to obtain the length parameters of the heating plate, the distance of each temperature sensor from the inlet of the heating plate, the contact perimeter of the heating plate and the infusion pipe, the convective heat transfer coefficient between the heating plate and the infusion pipe and the physical parameters of the liquid being transferred, and to construct a temperature conversion model between the sensor temperature at the outlet and the liquid temperature at the outlet. The preheating module is used to adjust the heating rate to the target heating rate using a PID algorithm during the preheating stage, and to heat the liquid temperature at the outlet end to the preheating temperature according to the target heating rate and the temperature conversion model. The formal heating module is used to obtain, through experiments, the initial temperature of the preheating stage, the power consumption corresponding to heating to the preheating temperature, and the first mapping relationship table between the liquid temperature at the outlet end and the temperature of the preheating stage using the temperature conversion model during the formal heating stage. Based on the first mapping relationship table and the PID algorithm, the liquid temperature at the outlet end is heated to the target temperature. The temperature maintenance module is used to obtain a second mapping table of temperatures between the inlet position, the middle position, and the outlet position during the temperature maintenance phase, monitor the input conditions of the inlet position and the temperature of the middle position, and use the second mapping table and the temperature conversion model to perform PID adjustment of the outlet liquid temperature or provide abnormal reminders to the user.

9. A computer device, characterized in that, The method includes a memory and a processor, wherein the memory stores computer-readable instructions, and the processor executes the computer-readable instructions to implement the steps of the PID-based infusion heating method as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-readable instructions, which, when executed by a processor, implement the steps of the infusion heating method based on PID control as described in any one of claims 1 to 7.

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