Air conditioner and defrosting judgment method thereof, electronic equipment and storage medium

Abstract

The invention discloses an air conditioner and a defrosting judgment method thereof, electronic equipment and a storage medium. The method comprises the steps that environment parameters and system operation parameters are collected; and a plurality of real-time judgment indexes and a frosting risk index F are obtained based on the environment parameters and the system operation parameters, and if any real-time judgment index does not meet the corresponding preset requirement and F is larger than a set threshold value F0, it is judged that the air conditioner needs to be defrosted. According to the method, the multiple real-time judgment indexes and the frosting risk index F are obtained on the basis of the environment parameters and the system operation parameters, double verification is conducted by combining the real-time judgment indexes and the frosting risk index F, then whether the air conditioner evaporator needs to be defrosted or not is judged, the accuracy rate is higher than that of the prior art depending on a single temperature difference index, and therefore the technical problems of mistaken defrosting and delayed defrosting are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and in particular to an air conditioner and a defrosting determination method thereof, an electronic device, and a storage medium. Background Art

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

[0003] In order to solve the technical problems of false defrosting and delayed defrosting in the prior art, the present invention provides an air conditioner and a defrost determination method thereof, an electronic device and a storage medium.

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

[0005] A first aspect of the present invention provides an air conditioner defrost determination method, comprising: Collect environmental parameters and system operation parameters; Based on the environmental parameters and system operating parameters, several real-time discrimination indicators and frost risk index F are obtained. The real-time discrimination indicators include: outdoor ambient temperature T outdoor and evaporator outlet temperature T out The temperature difference T, suction superheat SH and evaporation pressure drop rate between them are determined. If any real-time judgment index 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 be defrosted.

[0006] Preferably, the environmental parameters include the outdoor ambient temperature T outdoor and outdoor ambient humidity H outdoor .

[0007] Preferably, the system operating parameters include the evaporator outlet temperature T out , suction temperature T 吸气 and evaporation pressure P.

[0008] Preferably, based on the P, the evaporation pressure corresponding to the saturation temperature T is obtained. 饱和 , SH=T 吸气 -T 饱和 .

[0009] Preferably, the real-time judgment indicator does not meet the corresponding preset requirements include: The T is less than the set temperature difference; The SH is greater than the set suction superheat; The evaporation pressure drop rate is greater than the set evaporation pressure drop rate.

[0010] Preferably, the formula for obtaining F is: F=σ(ω1˙T0+ω2˙ΔP0+ω3˙H outdoor +ω4˙T outdoor ); Where, T0: predicted evaporator temperature; ΔP0: predicted evaporation pressure drop; σ: Sigmoid function, used to standardize F to 0~1; ω i : Weight parameter.

[0011] Preferably, based on the T out , use the LSTM algorithm to train the model through historical data to obtain the T0.

[0012] Preferably, based on the P, the LSTM algorithm is used to train a model using historical data to obtain the ΔP0.

[0013] A second aspect of the present invention provides an air conditioner, which operates the method provided by the first aspect of the present invention, comprising: External environment perception module, used to collect environmental parameters; Internal environment perception module, 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 to be defrosted based on the environmental parameters sent by the external environment sensing module and the system operation parameters sent by the internal environment sensing module.

[0014] A third aspect of the present invention provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the computer program is loaded into a processor, the air conditioner defrosting determination method according to the first aspect of the present invention is implemented.

[0015] A fourth aspect of the present invention provides a storage medium storing a computer program. When the computer program is executed by a processor, the air conditioner defrosting determination method according to the first aspect of the present invention is implemented.

[0016] Compared with the prior art, the present invention has the following advantages: Based on environmental parameters and system operating parameters, a number of real-time identification indicators and a frost risk index F are obtained. These two are then combined for double verification to determine whether the air conditioner evaporator needs to be defrosted. This technology is more accurate than existing technologies that rely on a single temperature difference indicator, thus solving the technical problems of false and delayed defrosting. In addition, the outdoor ambient temperature T outdoor and the evaporator outlet temperature T out Obtain real-time judgment index temperature difference T and collect suction temperature T 吸气 Combined with T out The real-time judgment indicator suction superheat SH is obtained, and the evaporation pressure P is collected to obtain the real-time judgment indicator evaporation pressure drop rate. By verifying whether several real-time judgment indicators meet the corresponding preset requirements, this is used as one of the criteria for determining whether the air conditioner needs defrosting. This can determine whether frost has formed on the air conditioner evaporator, thereby improving the accuracy of defrost judgment. Collect outdoor ambient humidity H outdoor , based on T out Get T0, get ΔP0 based on P, and then get ΔP0 based on T0, ΔP0, H outdoor 、T outdoor The frost risk index F is obtained and verified to be greater than the set threshold F0 as one of the criteria for determining whether the air conditioner needs to be defrosted. This can make an early judgment on the tendency of frost formation on the air conditioner evaporator, thereby improving the accuracy of defrost judgment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a system framework diagram of an air conditioner according to the present invention.

[0018] 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 air 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 DESCRIPTION

[0019] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. The embodiments described in this application are only part of the embodiments of the present invention, not all of them. Based on the spirit of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] Unless otherwise specifically stated, the relative arrangement of components and steps, the numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0021] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0022] Technologies, methods and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods and equipment should be considered part of the authorization specification.

[0023] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0024] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0025] Embodiment 1 of the present invention provides an air conditioner defrost determination method. By making an advance judgment on the frosting trend of the evaporator and performing a double check based on the actual operating status, intelligent, accurate, and energy-saving defrost control is achieved. At the same time, superheat optimization and adjustment are performed during the defrost process to ensure compressor safety and energy efficiency. This method solves the problems of false defrost and delayed defrost caused by traditional systems relying on a single temperature difference indicator. The method senses the impending frosting state in advance, improves the judgment accuracy, and moves away from the inefficient method of fixed defrost time to dynamic defrost control based on the changing trend of sensor data, thereby improving heat exchange efficiency and avoiding insufficient or wasteful defrosting. The method includes: Collect environmental parameters and system operation parameters; Based on the environmental parameters and system operating parameters, several real-time judgment indicators and a frost risk index F are obtained. If any real-time judgment 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 be defrosted, otherwise no defrost is required.

[0026] If F>F0: it means 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 jointly participates in the defrost decision with the real-time judgment index.

[0027] Preferably, but not limited to, the environmental parameters include the outdoor ambient temperature T outdoor and outdoor ambient humidity H outdoor .

[0028] Further preferably but not limiting, the system operating parameters include the evaporator outlet temperature T out , suction temperature T 吸气 and evaporation pressure P.

[0029] Further preferably but not limitatively, some of the real-time discrimination indicators include: Temperature difference T, T = T outdoor -T out ; Suction superheat SH, based on the P and the refrigerant temperature and pressure comparison table, the evaporation pressure corresponding to the saturation temperature T is obtained. 饱和 , SH=T 吸气 -T 饱和 ; The rate of evaporation pressure drop is the value of the evaporation pressure P drop per unit time.

[0030] Further preferably but not limitatively, the real-time determination indicator does not meet the corresponding preset requirements including: The T is less than the set temperature difference; The SH is greater than the set suction superheat; The evaporation pressure drop rate is greater than the set evaporation pressure drop rate.

[0031] Preferably, if T<3°C, it is considered that frost has formed.

[0032] Preferably but not limitatively, the formula for obtaining F is: F=σ(ω1˙T0+ω2˙ΔP0+ω3˙H outdoor +ω4˙T outdoor ); Where, T0: predicted evaporator temperature; ΔP0: predicted evaporation pressure drop; σ: Sigmoid function, used to standardize F to 0~1; ω i : Weight parameter, which can be set based on experience.

[0033] F is a continuous value between 0 and 1, which is used to indicate the possibility of the air conditioner entering a frosting state in the current state.

[0034] Further preferred but not limiting, based on the T out The T0 is obtained by training the model with historical data using algorithms such as LSTM (Long Short-Term Memory Network).

[0035] Further preferably but not limitatively, the ΔP0 is obtained by using an algorithm such as LSTM based on the P and training a model with historical data.

[0036] Preferably, but not restrictively, the environmental parameters and the system operating parameters are collected and stored simultaneously, and F is obtained based on the environmental parameters and the system operating parameters in the past 5 to 10 minutes.

[0037] Preferably, but not limitatively, the method further comprises collecting time parameters, wherein the time parameters include operating time, last defrost interval, defrost duration, etc.

[0038] Generally, air conditioners will have timed defrost during heating operation. The operating time and the last defrost interval are obtained to control the air conditioner to defrost after running at low temperature for a certain period of time; the defrost duration is obtained to ensure that the air conditioner is completely defrosted during timed defrost at different low temperatures.

[0039] Preferably, but not limitatively, the system operating parameters further include compressor frequency f, electronic expansion valve opening Δt and evaporator inlet temperature.

[0040] After determining that the air conditioner needs to be defrosted, the air conditioner will defrost in four stages: Phase 1, pre-processing phase (2-3 seconds before startup): Reduce the compressor frequency f to medium or low to avoid strong refrigerant backwash; Adjust the electronic expansion valve Δt to the preset initial opening to facilitate stable reversing; Turn off the outdoor fan to prevent the cold air from taking away the heat.

[0041] Stage 2, reversing defrost stage: The four-way valve switches from heating to cooling, that is, the system is reversed; The compressor frequency f maintains stable operation at medium frequency; The electronic expansion valve opening Δt is dynamically adjusted to control the system superheat. If the superheat is too high, the electronic expansion valve opening Δt is increased. If the superheat is too low, the electronic expansion valve opening Δt is reduced. Otherwise, the expansion valve opening Δt is not adjusted.

[0042] Phase 3: Overheat protection coordinated control: If SH>15℃ or T 吸气 >20℃, the system executes: ① increase the opening of the electronic expansion valve Δt, ② reduce the compressor frequency f by 5-10Hz.

[0043] Stage 4, defrost stability maintenance: The system maintains the reverse state until the defrost completion judgment is triggered; By controlling the opening Δt of the electronic expansion valve, the evaporator temperature is maintained at 0~10℃ to accelerate defrosting.

[0044] Traditional defrosting often uses "fixed time + temperature judgment", which can easily cause over-defrosting or under-defrosting. This invention adopts a dynamic judgment model, combining the following three core indicators: 1. Evaporator temperature rise rate: Calculate the temperature rise rate T2 within 5 consecutive seconds. If the temperature rise slows down, it means that the frost layer has melted; 2. Heat exchange temperature difference recovery: 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 greater than 4°C, it is determined that the heat exchange capacity has been restored. 3. Time window protection: Set the shortest defrost time and the longest defrost time, and force exit when timeout occurs. The shortest defrost time is preferably 2 minutes, and the longest defrost time is preferably 8 minutes.

[0045] like Figure 1 As shown, embodiment 2 of the present invention provides an air conditioner, which operates the method provided in embodiment 1 of the present invention, including: A four-way valve 1, a condenser 2, an electronic expansion valve 3 and an evaporator 4 are connected in a closed loop in sequence; A compressor 5 is connected to the four-way valve 1; External environment perception module, used to collect environmental parameters; Internal environment perception module, 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 to be defrosted based on the environmental parameters sent by the external environment sensing module and the system operation parameters sent by the internal environment sensing module.

[0046] Preferably, but not restrictively, the external environment sensing module includes an external environment temperature sensing package 6 and a humidity sensor. The external environment temperature sensing package 6 is used to collect the outdoor environment temperature T outdoor The humidity sensor is used to collect the outdoor humidity H outdoor .

[0047] Preferably, but not limiting, the internal environment sensing module includes an internal environment temperature sensing package 7, an air intake temperature sensing package 8 and a pressure sensor 9. The internal environment temperature sensing package 7 is used to collect the outlet temperature T of the evaporator 4. out The air intake temperature sensor 8 is used to collect the air intake temperature T 吸气 The pressure sensor 9 is used to collect the evaporation pressure P.

[0048] Preferably but not restrictively, the air conditioner also includes an external fan 10, an air separator 11, a liquid pipe valve 12, an air pipe valve 13, an air pipe valve temperature sensor 14 and an internal fan 15. The external fan 10 is arranged on one side of the condenser 2, and the internal fan 15 is arranged on one side of the evaporator 4. The air separator 11, the four-way valve 1 and the compressor 5 are connected in a closed loop in sequence. The liquid pipe valve 12 is arranged on the pipeline between the electronic expansion valve 3 and the evaporator 4, and the air pipe valve 13 and the air pipe valve temperature sensor 14 are arranged on the pipeline between the evaporator 4 and the four-way valve 1.

[0049] Embodiment 3 of the present invention provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the computer program is loaded into the processor, the air conditioner defrost determination method described in Embodiment 1 of the present invention is implemented.

[0050] A fourth embodiment of the present invention provides a storage medium storing a computer program. When the computer program is executed by a processor, the air conditioner defrost determination method described in embodiment 1 of the present invention is implemented.

[0051] Compared with the prior art, the present invention has the following advantages: Based on environmental parameters and system operating parameters, a number of real-time identification indicators and a frost risk index F are obtained. These two are then combined for double verification to determine whether the air conditioner evaporator needs to be defrosted. This technology is more accurate than existing technologies that rely on a single temperature difference indicator, thus solving the technical problems of false and delayed defrosting. In addition, the outdoor ambient temperature T outdoor and the evaporator outlet temperature T out Obtain real-time judgment index temperature difference T and collect suction temperature T 吸气 Combined with T out The real-time judgment indicator suction superheat SH is obtained, and the evaporation pressure P is collected to obtain the real-time judgment indicator evaporation pressure drop rate. By verifying whether several real-time judgment indicators meet the corresponding preset requirements, this is used as one of the criteria for determining whether the air conditioner needs defrosting. This can determine whether frost has formed on the air conditioner evaporator, thereby improving the accuracy of defrost judgment. Collect outdoor ambient humidity H outdoor , based on T out Get T0, get ΔP0 based on P, and then get ΔP0 based on T0, ΔP0, H outdoor 、T outdoor The frost risk index F is obtained and verified to be greater than the set threshold F0 as one of the criteria for determining whether the air conditioner needs to be defrosted. This can make an early judgment on the tendency of frost formation on the air conditioner evaporator, thereby improving the accuracy of defrost judgment.

[0052] The present disclosure may be a system, method and / or computer program product. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for causing a processor to implement various aspects of the present disclosure.

[0053] A computer-readable storage medium can be a tangible device that can hold and store instructions used by an instruction execution device. A computer-readable storage medium can be, for example, but is not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disc read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanical encoding device, such as a punch card or a raised structure in a groove on which instructions are stored, and any suitable combination thereof. As used herein, a computer-readable storage medium is not to be construed as a transient signal per se, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagated through a waveguide or other transmission medium (e.g., a light pulse through a fiber optic cable), or an electrical signal transmitted through an electrical wire.

[0054] The computer-readable program instructions described herein can be downloaded from a computer-readable storage medium to each computing / processing device, or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network can include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. The network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards the computer-readable program instructions to be stored in the computer-readable storage medium in each computing / processing device.

[0055] The computer program instructions for performing the operations of the present disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, state 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++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The computer-readable program instructions may be executed entirely on the user's computer, partially on the user's computer, as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of 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, the state information of the computer-readable program instructions is used to personalize an electronic circuit, such as a programmable logic circuit, a field programmable gate array (FPGA), or a programmable logic array (PLA), so that the electronic circuit can execute the computer-readable program instructions, thereby implementing various aspects of the present disclosure.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. A method for determining defrosting of an air conditioner, characterized in that: include: Collect environmental parameters and system operation parameters; Based on the environmental parameters and system operating parameters, several real-time discrimination indicators and frost risk index F are obtained. The real-time discrimination indicators include: outdoor ambient temperature T outdoor and evaporator outlet temperature T out The temperature difference T, suction superheat SH and evaporation pressure drop rate between them are determined. If any real-time judgment index 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 be defrosted.

2. The air conditioner defrost determination method according to claim 1, characterized in that: The environmental parameters include the outdoor ambient temperature T outdoor and outdoor ambient humidity H outdoor .

3. The air conditioner defrost determination method according to claim 2, characterized in that: The system operating parameters include the evaporator outlet temperature T out , suction temperature T 吸气 and evaporation pressure P.

4. The air conditioner defrost determination method according to claim 3, characterized in that: Based on the P, the evaporation pressure corresponding to the saturation temperature T is obtained. 饱和 , SH=T 吸气 -T 饱和 .

5. The air conditioner defrost determination method according to claim 1, characterized in that: The real-time judgment indicator does not meet the corresponding preset requirements include: The T is less than the set temperature difference; The SH is greater than the set suction superheat; The evaporation pressure drop rate is greater than the set evaporation pressure drop rate.

6. The air conditioner defrost determination method according to claim 3, characterized in that: The formula for obtaining F is: F=σ(ω1˙T0+ω2˙ΔP0+ω3˙H outdoor +ω4˙T outdoor ); Where, T0: predicted evaporator temperature; ΔP0: predicted evaporation pressure drop; σ: Sigmoid function, used to standardize F to 0~1; ω i : Weight parameter.

7. The air conditioner defrost determination method according to claim 6, characterized in that: Based on the T out , use the LSTM algorithm to train the model through historical data to obtain the T0.

8. The air conditioner defrost determination method according to claim 6, characterized in that: Based on the P, the LSTM algorithm is used to train the model through historical data to obtain the ΔP0.

9. An air conditioner, characterized in that: The air conditioner defrost determination method according to any one of claims 1 to 8 is executed, comprising: External environment perception module, used to collect environmental parameters; Internal environment perception module, 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 to be defrosted based on the environmental parameters sent by the external environment sensing module and the system operation parameters sent by the internal environment sensing module.

10. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the computer program is loaded into a processor, the air conditioner defrost determination method according to any one of claims 1 to 8 is implemented.

11. A storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the air conditioner defrost determination method according to any one of claims 1 to 8 is implemented.

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