An air conditioner and its defrosting detection method, electronic device and storage medium

Abstract

This invention discloses an air conditioner, its defrosting determination method, electronic device, and storage medium. The method includes: collecting environmental parameters and system operating parameters; obtaining several real-time discrimination indicators and a frost risk index F based on the environmental parameters and system operating parameters; if any real-time discrimination indicator does not meet the corresponding preset requirements and F is greater than a set threshold F0, then the air conditioner is determined to need defrosting. This invention obtains several real-time discrimination indicators and a frost risk index F based on environmental parameters and system operating parameters, and performs double verification using both to determine whether the air conditioner evaporator needs defrosting. This method has a higher accuracy than existing technologies that rely on a single temperature difference indicator, thereby solving the technical problems of false defrosting and delayed defrosting.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to an air conditioner and its defrosting determination method, electronic device and storage medium. Background Technology

[0002] Traditional air conditioner evaporator defrosting control often relies on a single indicator (such as evaporator temperature <0℃, or temperature difference <a certain value) to determine whether frost has formed. However, the actual frost formation process is affected by a combination of factors, such as humidity, refrigerant status, and load changes. A single indicator has a large error, leading to problems such as false defrosting and delayed defrosting in defrosting control. Summary of the Invention

[0003] To address the technical problems of false defrosting and delayed defrosting in existing technologies, this invention provides an air conditioner, a defrosting judgment method, an electronic device, and a storage medium.

[0004] The present invention adopts the following technical solution.

[0005] The first aspect of the present invention provides a method for determining air conditioner defrosting, comprising:

[0006] Collect environmental parameters and system operating parameters;

[0007] Based on the aforementioned environmental parameters and system operating parameters, several real-time discrimination indicators and a frost risk index F are obtained. The real-time discrimination indicators include: outdoor ambient temperature T. outdoor With evaporator outlet temperature T out The temperature difference T, suction superheat SH, and evaporation pressure drop rate are used to determine if the air conditioner needs to defrost if any of the real-time judgment indicators does not meet the corresponding preset requirements and F is greater than the set threshold F0.

[0008] Preferably, the environmental parameters include the outdoor ambient temperature T. outdoor and outdoor ambient humidity H outdoor .

[0009] Preferably, the system operating parameters include the evaporator outlet temperature T. out Intake temperature T 吸气 And evaporation pressure P.

[0010] Preferably, the saturation temperature T corresponding to the evaporation pressure is obtained based on the P. 饱和 SH=T 吸气 -T 饱和 .

[0011] Preferably, the real-time discrimination index does not meet the corresponding preset requirements, including:

[0012] The temperature difference T is less than the set temperature difference;

[0013] The SH is greater than the set intake superheat.

[0014] The rate of decrease in evaporation pressure is greater than the set rate of decrease in evaporation pressure.

[0015] Preferably, the formula for obtaining F is:

[0016] F=σ(ω1˙T0+ω2˙ΔP0+ω3˙H outdoor +ω4˙T outdoor );

[0017] Wherein, T0: predicted evaporator temperature;

[0018] ΔP0: Predicted decrease in evaporation pressure;

[0019] σ: Sigmoid function, used to standardize F to 0~1;

[0020] ω i : Weight parameters, i=1,2,3,4.

[0021] Preferably, based on the T out The LSTM algorithm is used to train a model using historical data to obtain T0.

[0022] Preferably, based on P, the LSTM algorithm is used to train a model using historical data to obtain ΔP0.

[0023] A second aspect of the present invention provides an air conditioner that operates the method provided in the first aspect of the present invention, comprising:

[0024] External environment sensing module, used to collect environmental parameters;

[0025] The internal environment sensing module is used to collect system operating parameters;

[0026] The controller is connected to the external environment sensing module and the internal environment sensing module, and determines whether the air conditioner needs defrosting based on the environmental parameters sent by the external environment sensing module and the system operating parameters sent by the internal environment sensing module.

[0027] A third aspect of the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor.

[0028] When the computer program is loaded into the processor, it implements the air conditioner defrosting determination method according to the first aspect of the present invention.

[0029] A fourth aspect of the present invention provides a storage medium storing a computer program.

[0030] When the computer program is executed by the processor, it implements the air conditioner defrosting determination method according to the first aspect of the present invention.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0032] Based on environmental parameters and system operating parameters, several real-time discrimination indicators and a frost risk index F are obtained, and the two are combined for double verification to determine whether the air conditioner evaporator needs defrosting. This method is more accurate than existing technologies that rely on a single temperature difference indicator, thus solving the technical problems of false defrosting and delayed defrosting.

[0033] In addition, the outdoor ambient temperature T was collected. outdoor and evaporator outlet temperature T out Obtain the real-time discriminant index temperature difference T, and collect the inhalation temperature T. 吸气 Combined with T out The system acquires the real-time discrimination index suction superheat SH, collects the evaporation pressure P, and acquires the real-time discrimination index evaporation pressure drop rate. By verifying whether several real-time discrimination indices meet the corresponding preset requirements, it serves as one of the criteria for determining whether the air conditioner needs defrosting. This allows the system to determine whether a frost layer has formed on the air conditioner evaporator, thus improving the accuracy of defrosting judgment.

[0034] Collect outdoor ambient humidity H outdoor Based on T out Obtain T0, obtain ΔP0 based on P, and then obtain T0, ΔP0, and H. outdoor T outdoor The frost risk index F is obtained, and whether F is greater than the set threshold F0 is used as one of the criteria for determining whether the air conditioner needs to be defrosted. This allows for early prediction of the trend of frost formation on the air conditioner evaporator, thus improving the accuracy of defrosting judgment. Attached Figure Description

[0035] Figure 1 This is a system framework diagram of an air conditioner according to the present invention.

[0036] 1. Four-way valve; 2. Condenser; 3. Electronic expansion valve; 4. Evaporator; 5. Compressor; 6. External environment temperature sensor; 7. Internal environment temperature sensor; 8. Intake temperature sensor; 9. Pressure sensor; 10. External fan; 11. Gas separator; 12. Liquid pipe valve; 13. Gas pipe valve; 14. Gas pipe valve temperature sensor; 15. Internal fan. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this invention. The embodiments described in this application are merely some embodiments of this invention, and not all embodiments. Based on the spirit of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this invention.

[0038] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention.

[0039] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0040] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0041] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0042] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0043] Embodiment 1 of the present invention provides an air conditioner defrosting judgment method. By predicting the evaporator frosting trend in advance and performing dual verification based on the actual operating status, intelligent, accurate, and energy-saving defrosting control is achieved. Simultaneously, superheat optimization adjustment is performed during the defrosting process to ensure compressor safety and energy efficiency. This solves the problems of false defrosting and delayed defrosting caused by traditional systems relying on a single temperature difference index. It improves judgment accuracy by detecting the impending frosting state in advance, and abandons the inefficient method of fixed defrosting time, shifting to dynamic defrosting control based on sensor data changes. This improves heat exchange efficiency and avoids insufficient or wasteful defrosting. The method includes:

[0044] Collect environmental parameters and system operating parameters;

[0045] Based on the environmental parameters and system operating parameters, several real-time discrimination indicators and a frost risk index F are obtained. If any real-time discrimination indicator does not meet the corresponding preset requirements and F is greater than the set threshold F0, it is determined that the air conditioner needs to defrost; otherwise, defrosting is not required.

[0046] If F>F0: This indicates that the air conditioner is about to enter the frosting state. At this time, the prediction result is transmitted to the controller as a "prediction trigger signal" and participates in the defrosting decision together with the real-time discrimination index.

[0047] Preferably, but not limitingly, the environmental parameters include outdoor ambient temperature T. outdoor and outdoor ambient humidity H outdoor .

[0048] Further preferred, but not limiting, is that the system operating parameters include the evaporator outlet temperature T. out Intake temperature T 吸气 And evaporation pressure P.

[0049] Further preferred, but not limiting, options include several of the real-time discrimination metrics, including:

[0050] Temperature difference T, T = T outdoor -T out ;

[0051] The suction superheat SH is used to obtain the saturation temperature T corresponding to the evaporation pressure based on the aforementioned P refrigerant temperature and pressure reference table. 饱和 SH=T 吸气 -T 饱和 ;

[0052] The rate of decrease in evaporation pressure is the numerical value of the decrease in evaporation pressure P per unit time.

[0053] Further preferred, but not restrictive, provisions that the real-time discrimination index does not meet the corresponding preset requirements include:

[0054] The temperature difference T is less than the set temperature difference;

[0055] The SH is greater than the set intake superheat.

[0056] The rate of decrease in evaporation pressure is greater than the set rate of decrease in evaporation pressure.

[0057] Preferably, if T < 3℃, the frost layer is considered to have formed.

[0058] Preferably, but not restrictively, the formula for obtaining F is:

[0059] F=σ(ω1˙T0+ω2˙ΔP0+ω3˙H outdoor +ω4˙T outdoor );

[0060] Wherein, T0: predicted evaporator temperature;

[0061] ΔP0: Predicted decrease in evaporation pressure;

[0062] σ: Sigmoid function, used to standardize F to 0~1;

[0063] ω i Weight parameters can be set based on experience, i=1,2,3,4.

[0064] F is a continuous value between 0 and 1, used to represent the probability that the air conditioner will enter a frosting state under its current condition.

[0065] Further preferred, but not limiting, options based on the T out The T0 is obtained by using algorithms such as LSTM (Long Short-Term Memory) to train a model with historical data.

[0066] Further preferred, but not limiting, methods may be employed to obtain ΔP0 by using algorithms such as LSTM based on P and training a model using historical data.

[0067] Preferred but not restrictive, environmental parameters and system operating parameters are collected and stored simultaneously, and F is obtained based on environmental parameters and system operating parameters from the past 5 to 10 minutes.

[0068] Preferably, but not limitingly, the method further includes collecting time parameters, including running time, last defrost interval, defrost duration, etc.

[0069] Air conditioners typically have a timed defrosting function during heating operation. By obtaining the operating time and the interval between the last defrosting, the system can control the air conditioner to defrost after running at low temperatures for a certain period of time. The system can also obtain the defrosting duration to ensure that the air conditioner defrosts completely during the timed defrosting process at different low temperatures.

[0070] Preferably, but not limitingly, the system operating parameters also include compressor frequency f, electronic expansion valve opening Δt, and evaporator inlet temperature.

[0071] After determining that the air conditioner needs defrosting, the defrosting process involves four stages:

[0072] Phase 1, Pre-processing phase (2-3 seconds before startup):

[0073] Reduce the compressor frequency f to a low to medium setting to avoid strong refrigerant backflow;

[0074] Adjusting the electronic expansion valve Δt to the preset initial opening degree facilitates stable commutation;

[0075] Turn off the outdoor fan to prevent cold air from carrying away the heat.

[0076] Phase Two, Reversing Defrosting Phase:

[0077] The four-way valve switches from heating to cooling, meaning the system reverses direction.

[0078] The compressor frequency f maintains stable operation at the medium frequency.

[0079] The opening degree Δt of the electronic expansion valve is dynamically adjusted to control the superheat of the system. If the superheat is too high, the opening degree Δt of the electronic expansion valve is increased; if the superheat is too low, the opening degree Δt of the electronic expansion valve is decreased; otherwise, the opening degree Δt of the expansion valve is not adjusted.

[0080] Phase Three, Overheat Protection Coordinated Control:

[0081] If SH > 15℃ or T 吸气 At temperatures above 20℃, the system will: ① increase the opening degree Δt of the electronic expansion valve, and ② reduce the compressor frequency f by 5-10Hz.

[0082] Phase Four, Defrosting Stable Maintenance:

[0083] The system remains in reverse state until the defrosting completion judgment is triggered;

[0084] By controlling the opening degree Δt of the electronic expansion valve, the evaporator temperature is maintained at 0~10℃ to accelerate defrosting.

[0085] Traditional defrosting methods often use a "fixed time + temperature judgment" approach, which can easily lead to over-defrosting or under-defrosting.

[0086] This invention employs a dynamic judgment model, combining the following three core indicators:

[0087] 1. Evaporator temperature rise rate:

[0088] If the temperature rise rate T2 within 5 consecutive seconds slows down, it indicates that the frost has melted.

[0089] 2. Heat exchange temperature difference recovery:

[0090] Compare the temperature difference between the inlet and outlet of the evaporator. If the temperature difference between the inlet and outlet of the evaporator is >4℃, it can be determined that the heat exchange capacity has been restored.

[0091] 3. Time window protection:

[0092] Set the shortest and longest defrost times, and force exit if the timeout is exceeded. The preferred shortest defrost time is 2 minutes, and the preferred longest defrost time is 8 minutes.

[0093] like Figure 1 As shown, Embodiment 2 of the present invention provides an air conditioner that operates the method provided in Embodiment 1 of the present invention, including:

[0094] The four-way valve 1, condenser 2, electronic expansion valve 3, and evaporator 4 are connected in a closed loop in sequence.

[0095] Compressor 5 is connected to the four-way valve 1;

[0096] External environment sensing module, used to collect environmental parameters;

[0097] The internal environment sensing module is used to collect system operating parameters;

[0098] The controller is connected to the external environment sensing module and the internal environment sensing module, and determines whether the air conditioner needs defrosting based on the environmental parameters sent by the external environment sensing module and the system operating parameters sent by the internal environment sensing module.

[0099] Preferably, but not limitingly, the external environment sensing module includes an external environment temperature sensing element 6 and a humidity sensor, wherein the external environment temperature sensing element 6 is used to collect the outdoor ambient temperature T. outdoor The humidity sensor is used to collect outdoor ambient humidity H. outdoor .

[0100] Preferably, but not limitingly, the internal environment sensing module includes an internal environment temperature sensing element 7, an intake temperature sensing element 8, and a pressure sensor 9. The internal environment temperature sensing element 7 is used to collect the outlet temperature T of the evaporator 4. out The inhalation temperature sensor 8 is used to collect the inhalation temperature T. 吸气 The pressure sensor 9 is used to collect the evaporation pressure P.

[0101] Preferably, but not limitingly, the air conditioner further includes an outdoor fan 10, a gas separator 11, a liquid pipe valve 12, a gas pipe valve 13, a gas pipe valve temperature sensor 14, and an indoor fan 15. The outdoor fan 10 is located on one side of the condenser 2, and the indoor fan 15 is located on one side of the evaporator 4. The gas separator 11, the four-way valve 1, and the compressor 5 are connected in a closed loop in sequence. A liquid pipe valve 12 is installed on the pipeline between the electronic expansion valve 3 and the evaporator 4, and a gas pipe valve 13 and a gas pipe valve temperature sensor 14 are installed on the pipeline between the evaporator 4 and the four-way valve 1.

[0102] Embodiment 3 of the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor.

[0103] When the computer program is loaded into the processor, it implements the air conditioner defrosting judgment method described in Embodiment 1 of the present invention.

[0104] Embodiment 4 of the present invention provides a storage medium storing a computer program.

[0105] When the computer program is executed by the processor, it implements the air conditioner defrosting judgment method described in Embodiment 1 of the present invention.

[0106] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0107] Based on environmental parameters and system operating parameters, several real-time discrimination indicators and a frost risk index F are obtained, and the two are combined for double verification to determine whether the air conditioner evaporator needs defrosting. This method is more accurate than existing technologies that rely on a single temperature difference indicator, thus solving the technical problems of false defrosting and delayed defrosting.

[0108] In addition, the outdoor ambient temperature T was collected. outdoor and evaporator outlet temperature T out Obtain the real-time discriminant index temperature difference T, and collect the inhalation temperature T. 吸气 Combined with T out The system acquires the real-time discrimination index suction superheat SH, collects the evaporation pressure P, and acquires the real-time discrimination index evaporation pressure drop rate. By verifying whether several real-time discrimination indices meet the corresponding preset requirements, it serves as one of the criteria for determining whether the air conditioner needs defrosting. This allows the system to determine whether a frost layer has formed on the air conditioner evaporator, thus improving the accuracy of defrosting judgment.

[0109] Collect outdoor ambient humidity H outdoor Based on T out Obtain T0, obtain ΔP0 based on P, and then obtain T0, ΔP0, and H. outdoor T outdoor The frost risk index F is obtained, and whether F is greater than the set threshold F0 is used as one of the criteria for determining whether the air conditioner needs to be defrosted. This allows for early prediction of the trend of frost formation on the air conditioner evaporator, thus improving the accuracy of defrosting judgment.

[0110] This disclosure can be a system, method, and / or computer program product. A computer program product may include a computer-readable storage medium having computer-readable program instructions loaded thereon for causing a processor to implement various aspects of this disclosure.

[0111] Computer-readable storage media can be tangible devices capable of holding and storing instructions for use by an instruction execution device. Computer-readable storage media can be, for example, but not limited to, electrical storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, or any suitable combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital multifunction disc (DVD), memory sticks, floppy disks, mechanical encoding devices, such as punch cards or recessed protrusions storing instructions thereon, and any suitable combination thereof. The computer-readable storage media used herein are not to be construed as transient signals themselves, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (e.g., light pulses through fiber optic cables), or electrical signals transmitted through wires.

[0112] The computer-readable program instructions described herein can be downloaded from computer-readable storage media to various computing / processing devices, or downloaded via a network, such as the Internet, local area network, wide area network, and / or wireless network, to an external computer or external storage device. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards them to the computer-readable storage media in the respective computing / processing device.

[0113] Computer program instructions used to perform the operations of this disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, status setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, etc., and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The computer-readable program instructions may execute entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or may be connected to an external computer (e.g., via the Internet using an Internet service provider). In some embodiments, electronic circuitry, such as programmable logic circuitry, field-programmable gate arrays (FPGAs), or programmable logic arrays (PLAs), is personalized by utilizing the status information of the computer-readable program instructions to implement various aspects of this disclosure.

[0114] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A method for determining air conditioner defrosting, characterized in that, include: Collect environmental parameters and system operating parameters, including outdoor ambient temperature T. outdoor and outdoor ambient humidity H outdoor The system operating parameters include the evaporator outlet temperature T. out Intake temperature T 吸气 and evaporation pressure P; Based on the aforementioned environmental parameters and system operating parameters, several real-time discrimination indicators and a frost risk index F are obtained. The real-time discrimination indicators include: outdoor ambient temperature T. outdoor With evaporator outlet temperature T out The temperature difference T, suction superheat SH, and evaporation pressure drop rate are used to determine if the air conditioner needs to defrost if any of the real-time judgment indicators does not meet the corresponding preset requirements and F is greater than the set threshold F0. The formula for obtaining F is: F = σ(ω1˙T0 + ω2˙ΔP0 + ω3˙H) outdoor +ω4˙T outdoor ); Where T0 is the predicted evaporator temperature; ΔP0 is the predicted evaporation pressure drop; σ is the Sigmoid function, used to standardize F to 0~1; ω i Here are the weight parameters, i = 1, 2, 3, 4.

2. The method for determining air conditioner defrosting according to claim 1, characterized in that: Based on the aforementioned P, the saturation temperature T corresponding to the evaporation pressure is obtained. 饱和 SH=T 吸气 -T 饱和 .

3. The method for determining air conditioner defrosting according to claim 1, characterized in that, The real-time discrimination index does not meet the corresponding preset requirements, including: The temperature difference T is less than the set temperature difference; The SH is greater than the set intake superheat. The rate of decrease in evaporation pressure is greater than the set rate of decrease in evaporation pressure.

4. The method for determining air conditioner defrosting according to claim 1, characterized in that: Based on the T out The LSTM algorithm is used to train a model using historical data to obtain T0.

5. The method for determining air conditioner defrosting according to claim 1, characterized in that: Based on the aforementioned P, the LSTM algorithm is used to train a model using historical data to obtain the ΔP0.

6. An air conditioner, characterized in that, The method for determining air conditioner defrosting according to any one of claims 1-5 includes: External environment sensing module, used to collect environmental parameters; The internal environment sensing module is used to collect system operating parameters; The controller is connected to the external environment sensing module and the internal environment sensing module, and determines whether the air conditioner needs defrosting based on the environmental parameters sent by the external environment sensing module and the system operating parameters sent by the internal environment sensing module.

7. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the computer program is loaded into the processor, it implements the air conditioner defrosting determination method according to any one of claims 1-5.

8. A storage medium storing a computer program, characterized in that: When the computer program is executed by the processor, it implements the air conditioner defrosting determination method according to any one of claims 1-5.

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