Air conditioner defrosting control method, system, equipment and product

Abstract

The embodiment of the invention mainly aims at providing an air conditioner defrosting control method, system, equipment and product, and belongs to the technical field of air conditioner control. When the temperature of the outdoor heat exchange pipe is smaller than a first preset value, the temperature of an indoor heat exchange pipe is obtained; when the temperature of the indoor heat exchange pipe is smaller than the preset temperature, a frost restraining mode is started; when the air conditioner is in the frost restraining mode, the temperature change rate of an indoor heat exchange pipe is obtained; and when the temperature change rate of the indoor heat exchange pipe meets the preset requirement, the defrosting mode of the air conditioner is controlled to be started. According to the method, the frosting condition of the outdoor heat exchange tube is judged by obtaining the temperature change rate of the indoor heat exchange tube, so that the defrosting mode of the air conditioner is accurately controlled to be started, and the problem that in the heating mode of an existing household air conditioner, the defrosting opportunity is not accurately judged is solved.

Description

Technical Field

[0001] This invention relates to the field of air conditioning control technology, specifically to an air conditioning defrosting control method, system, device, and product. Background Technology

[0002] The core of household air conditioning heating is the circulation of refrigerant, absorbing heat from the outdoor environment and transferring it indoors. The principle of air conditioning heating is the opposite of cooling; essentially, it "transfers" outdoor heat indoors. This relies on the coordinated work of four core components, as follows: Compressor: Compresses the low-temperature, low-pressure gaseous refrigerant, transforming it into a high-temperature, high-pressure gaseous refrigerant. This process significantly increases the refrigerant temperature, typically reaching over 80°C. Indoor Heat Exchanger (also called Condenser): The high-temperature, high-pressure refrigerant enters the indoor unit's heat exchanger, exchanging heat with the cold indoor air. The refrigerant releases heat, heating the indoor air, and condenses itself into a medium-temperature, high-pressure liquid refrigerant. Throttling Device, such as a capillary tube or electronic expansion valve: The liquid refrigerant passes through the throttling device, causing a rapid drop in pressure and temperature, becoming a low-temperature, low-pressure liquid refrigerant, with temperatures reaching below -20°C. Outdoor Heat Exchanger or Evaporator: The low-temperature, low-pressure refrigerant enters the outdoor unit's heat exchanger, absorbing heat from the outdoor environment. Even in winter, the outdoor air still contains heat, causing the refrigerant to evaporate into a low-temperature, low-pressure gaseous refrigerant. The cycle repeats: the gaseous refrigerant returns to the compressor, repeating the above process to continuously transfer outdoor heat to the indoor environment, thus achieving heating.

[0003] When a household air conditioner is operating in a low-temperature, high-humidity environment during winter, frost will form on the surface of the outdoor unit's heat exchanger, leading to a decrease in heat exchange efficiency and a reduction in heating capacity. Existing defrosting technologies mostly use timed defrosting or simple temperature difference defrosting, which have the following drawbacks: inaccurate judgment: it is easy to cause problems such as "false defrosting" (defrosting when there is no frost) or "delayed defrosting" (excessive frost layer), affecting energy efficiency and heating effect. Summary of the Invention

[0004] The main objective of this application is to provide an air conditioner defrosting control method, system, device, and product, which aims to solve the problem of inaccurate timing of defrosting mode activation in existing household air conditioners.

[0005] To achieve the above objectives, a first aspect of this application provides an air conditioning defrosting control method, the method comprising: Obtain the temperature of the outdoor heat exchanger pipe; When the temperature of the outdoor heat exchanger tube is lower than the first preset value, the temperature of the indoor heat exchanger tube is obtained. The defrost mode is activated when the temperature of the indoor heat exchanger tube is lower than the preset temperature. When the air conditioner is in the defrost mode, the temperature change rate of the indoor heat exchanger is obtained; When the temperature change rate of the indoor heat exchanger tube meets the preset requirements, the defrosting mode of the air conditioner is activated.

[0006] In some embodiments, obtaining the temperature change rate of the indoor heat exchanger tube when the air conditioner is in the defrost mode includes: The temperature of each indoor heat exchanger tube is acquired at regular intervals. Calculate the temperature difference of the indoor heat exchanger tubes at adjacent time intervals; The rate of temperature change of the indoor heat exchanger tubes is calculated based on the temperature difference between adjacent time intervals.

[0007] In some embodiments, controlling the air conditioner defrosting mode to start when the temperature change rate of the indoor heat exchanger tube meets a preset requirement includes: If the temperature change rate of the indoor heat exchanger tube is greater than the preset temperature threshold, it is determined that the frost thickness of the outdoor heat exchanger tube has reached the defrosting requirement, and the air conditioner defrosting mode is activated. In some implementations, activating the air conditioner defrosting mode includes: The four-way valve is de-energized, switching from heating mode to cooling mode and supplying high-temperature refrigerant gas to the outdoor unit. Control the outdoor fan to stop operating; Keep the compressor running; Control the electronic expansion valve to switch to the defrosting-specific opening; Adjust the indoor fan according to the temperature of the indoor heat exchange pipes. In some embodiments, adjusting the indoor fan according to the temperature of the indoor heat exchange tube includes: If the temperature of the indoor heat exchange tube is greater than the temperature threshold of the indoor heat exchange tube when the indoor fan stops, the indoor unit's air guide plate will be controlled to operate in its original state, the indoor fan will be controlled to operate at a medium-low speed to blow the residual heat of the coil into the room, and the electric heating will be turned on. If the temperature of the indoor heat exchanger tube is lower than the temperature threshold of the indoor heat exchanger tube when the indoor fan stops, then the indoor fan will be stopped, the air guide plate will be in anti-cold air mode, and the electric heating will be turned off. In some implementations, activating the defrost mode when the temperature of the indoor heat exchange tube is greater than a preset temperature includes: The electronic expansion valve is controlled to increase its opening in steps from the initial opening until it reaches the upper limit of the opening increase. The upper limit for increasing the opening degree includes the upper limit corresponding to the current outdoor ambient temperature. In some embodiments, after controlling the air conditioner defrosting mode to be activated based on the frosting condition of the outdoor heat exchange pipe, the method further includes: Obtain the defrosting time and the temperature of the outdoor heat exchanger tube; If the temperature of the outdoor heat exchanger tube exceeds the temperature threshold of the outdoor heat exchanger tube before exiting defrost mode, or if the defrost duration exceeds the defrost mode operation time threshold before exiting defrost mode, then defrost mode will be exited and heating will continue.

[0008] In some embodiments, after obtaining the temperature of the indoor heat exchanger when the temperature of the outdoor heat exchanger is less than a threshold, the method further includes: When the temperature of the indoor heat exchange tube is lower than the second preset value, it directly enters the defrosting mode.

[0009] To achieve the above objectives, another aspect of this application provides an air conditioning defrosting control system, comprising: The first data acquisition module is used to acquire the temperature of the outdoor heat exchanger pipe. The second data acquisition module is used to acquire the temperature of the indoor heat exchanger when the temperature of the outdoor heat exchanger is lower than the first preset value. The defrost control module is used to activate the defrost mode when the temperature of the indoor heat exchange tube is lower than the preset temperature. The third data acquisition module is used to acquire the temperature change rate of the indoor heat exchange tube when the air conditioner is in the defrost mode. The defrosting control module is used to control the air conditioner to start the defrosting mode when the temperature change rate of the indoor heat exchange tube meets the preset requirements.

[0010] To achieve the above objectives, another aspect of this application provides an electronic device, including a processor and a memory, wherein the memory is used to store computer program code, the computer program code including computer instructions, and the processor executes the computer program to implement an air conditioner defrosting control method.

[0011] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements an air conditioning defrosting control method.

[0012] This invention has at least the following beneficial effects: By acquiring the temperature of the indoor heat exchanger tube; when the temperature of the indoor heat exchanger tube is higher than a preset temperature, the defrost mode can be activated, which can quickly detect the initial frosting situation of the outside. In the case of light frosting, the defrost mode can delay the frosting of the outdoor heat exchanger tube while ensuring the comfort of indoor users. When the air conditioner is in the defrost mode, the temperature change rate of the indoor heat exchanger tube is acquired; the frosting situation of the outdoor heat exchanger tube is calculated based on the temperature change rate of the indoor heat exchanger tube; and the defrost mode of the air conditioner is controlled to be activated based on the frosting situation of the outdoor heat exchanger tube. When the outdoor heat exchanger tube is severely frosted, the frosting situation of the outdoor heat exchanger tube is accurately judged by the temperature change rate of the indoor heat exchanger tube, and then the activation and deactivation of the defrost mode are controlled, which can avoid the problems of false defrosting and untimely defrosting. Attached Figure Description

[0013] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention. To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1 A flowchart of an air conditioning defrosting control method provided in this application embodiment; Figure 2 A structural diagram of an air conditioning defrosting control system provided in this application embodiment; Figure 3 A schematic diagram of the hardware structure of an electronic device provided in an embodiment of this application; Figure 4 This is a schematic diagram illustrating the specific implementation process of the defrosting control method provided in the embodiments of this application. Detailed Implementation

[0014] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0015] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0016] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" and "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0017] 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 belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0018] When household air conditioners operate in low-temperature, high-humidity winter conditions, frost will form on the surface of the outdoor unit's heat exchanger, leading to decreased heat exchange efficiency and reduced heating capacity. Existing defrosting technologies mostly employ timed defrosting or simple temperature-difference defrosting, which have the following drawbacks: Inaccurate judgment: This easily results in "false defrosting" (defrosting when there is no frost) or "delayed defrosting" (excessive frost layer), affecting energy efficiency and heating performance. Poor user experience: During traditional defrosting, the indoor unit often blows cold air, causing large fluctuations in indoor temperature and poor comfort. Passive control: It only responds passively after frost formation, lacking means to actively intervene in the early stages of frost formation, resulting in poor continuity of heating operation.

[0019] Based on this, the main objective of the embodiments of this application is to provide an air conditioner defrosting control method, system, device and product, which aims to solve the problem of inaccurate judgment of heating in existing household air conditioners.

[0020] This application provides an air conditioner defrosting control method, system, device, and product, belonging to the field of air conditioning control technology. It can be applied to household split-type air conditioners, central air conditioning (multi-split systems), and heat pump air conditioners in northern winters and cold, damp weather in the south. The following embodiments illustrate this, starting with a description of an air conditioner defrosting control method.

[0021] Figure 1 This is a flowchart of an air conditioning defrosting control method provided in an embodiment of this application. Please refer to it. Figure 1 The air conditioning defrosting control method provided in this application embodiment may include, but is not limited to, steps S100, S200, S300A, S400 and S500 or steps S100, S200, S300B, S400 and S500.

[0022] Step S100: Obtain the temperature of the outdoor heat exchanger tube.

[0023] It's easy to understand that before determining whether to activate the defrost mode, the temperature of the outdoor heat exchanger pipe needs to be detected. Only when the temperature of the outdoor heat exchanger pipe is lower than a first preset value, meaning that frost has already formed on the outdoor heat exchanger pipe, will the determination of whether to activate the defrost mode begin. Furthermore, data from the temperature sensor installed on the outdoor heat exchanger pipe is obtained.

[0024] Step S200: When the temperature of the outdoor heat exchanger tube is lower than the first preset value, obtain the temperature of the indoor heat exchanger tube.

[0025] For example, an NTC thermistor or a PT100 temperature sensor is installed on the indoor heat exchanger pipe to collect temperature data at fixed time intervals. The acquired temperature data also includes: the temperature of the outdoor heat exchanger pipe, the outdoor temperature, the indoor temperature, and the indoor temperature. In this embodiment of the invention, assuming the current outdoor temperature is 1°C, within the outer ring interval 1 of T, the outdoor heat exchanger pipe temperature is -5°C, the first indoor heat exchanger pipe temperature is 42°C, and the second indoor heat exchanger pipe temperature is 40°C, after testing the temperature parameters, at least three temperature thresholds need to be preset to determine whether the air conditioning mode should be switched under the current environment: T1 = 4°C, T2 = -2°C, and T3 = 10°C. T1 is the first temperature threshold, used to assist in determining whether the defrost mode is activated; T2 is the second temperature threshold, used to assist in determining whether the defrost mode is activated; and T3 is the third temperature threshold, used to assist in determining whether the defrost mode is deactivated.

[0026] Step S300A: When the temperature of the indoor heat exchange tube is lower than the preset temperature, the defrosting mode is activated.

[0027] As is easily understood, this invention first detects the temperature of the outdoor heat exchanger pipe to determine if it is slightly frosted, and then detects the temperature of the indoor heat exchanger pipe. Only when the indoor heat exchanger pipe temperature exceeds a preset temperature, indicating sufficient indoor heating capacity, will the defrost mode be activated. Further, as an optional implementation, when the air conditioner is operating in heating mode, the system uses temperature sensors arranged in the indoor heat exchanger pipes to collect real-time heat exchanger pipe wall temperature data. This data is then compared in real-time with a preset defrost temperature threshold by the controller. If the indoor heat exchanger pipe temperature is consistently higher than the preset threshold and meets the system's stable operating conditions, the defrost mode is automatically activated. In this mode, the system optimizes the compressor operating frequency, adjusts the electronic expansion valve opening, and adjusts the indoor fan speed to reduce the temperature difference between the indoor heat exchanger and the air, suppressing condensation and frost formation on the heat exchanger pipe surface. Simultaneously, it maintains stable indoor heating output, preventing a decrease in heat exchange efficiency due to frost accumulation, and ensuring efficient and continuous operation of the air conditioning heating system in low-temperature and high-humidity environments.

[0028] Step S300B: When the temperature of the indoor heat exchange tube is less than the second preset value, the defrosting mode is entered directly.

[0029] For example, if the current temperature of the indoor heat exchanger tube is less than the second preset value, it means that the frost on the outdoor heat exchanger tube is already very serious, and the defrosting mode is skipped directly.

[0030] Step S400: When the air conditioner is in the defrost mode, obtain the temperature change rate of the indoor heat exchange tube.

[0031] In some embodiments, when the defrost mode is activated, the present invention continuously acquires the temperature of the indoor heat exchanger tube and calculates the temperature change rate of the indoor heat exchanger tube. Further, as an optional implementation, when the air conditioner is operating in the defrost mode, temperature sensors are installed at key measuring points of the heat exchanger tube in the indoor heat exchanger to collect continuous time-series surface temperature data of the heat exchanger tube in real time. Temperature values ​​are recorded based on a preset sampling period, and the temperature change per unit time is calculated to obtain the temperature change rate of the indoor heat exchanger tube, providing real-time temperature response feedback for the dynamic adjustment of the defrost mode.

[0032] Step S500: When the temperature change rate of the indoor heat exchange tube meets the preset requirements, control the air conditioner defrosting mode to be turned on.

[0033] It should be noted that this invention, by detecting the temperature change of the indoor heat exchanger tubes per unit time (i.e., the rate of temperature change), can more accurately control the activation of the defrosting mode. Specifically, by detecting the temperatures of the indoor and outdoor heat exchanger tubes, it can verify whether they can perform their heat transfer functions normally, ensuring the stable and efficient operation of the air conditioner's cooling and heating cycles, while also identifying potential faults and avoiding performance degradation or safety hazards. By detecting the temperature of the indoor heat exchanger tubes, its heat transfer efficiency and the smoothness of refrigerant flow within the tubes can be assessed, ensuring stable heat release and indoor temperature rise during heating mode. In some embodiments, detecting the outdoor heat exchanger tubes focuses on verifying whether it can successfully absorb low-grade heat from the outdoor environment and evaporate the refrigerant during heating, ensuring the overall energy efficiency, stability, and lifespan of the air conditioner, and preventing indoor temperature regulation effects or equipment malfunctions and safety risks due to heat exchanger tube performance failure.

[0034] Furthermore, step 300 may include, but is not limited to, step S310A.

[0035] Step S310A: Control the electronic expansion valve to increase the opening degree in steps from the initial opening degree until it reaches the upper limit of the opening degree increase for the current opening degree and the corresponding outdoor ambient temperature range.

[0036] For example, in defrost mode, the opening adjustment of the electronic expansion valve follows the logic of "initial reference + step-by-step increase + upper limit constraint of the range": the system first takes the initial opening under heating conditions as the starting point, and combines it with the preset range divided by the outdoor ambient temperature. Each time, the valve opening is gradually increased by a fixed amount, such as 5%-10% per cycle. During the process, the upper limit threshold of the opening corresponding to the current outdoor temperature zone is continuously matched. When the actual valve opening reaches the maximum allowable increase range set for the temperature zone, the step-by-step increase operation is stopped, and the current opening is kept stable. In this way, the temperature of the indoor heat exchange tube is indirectly controlled by precisely adjusting the refrigerant flow, thereby achieving the effect of suppressing frost.

[0037] In some embodiments, the temperature of the outdoor heat exchanger pipe is -5°C, and the outdoor ambient temperature is 1°C. The temperature of the outdoor heat exchanger pipe is compared with the outdoor ambient temperature minus T1. If the outdoor heat exchanger pipe temperature is less than the outdoor ambient temperature minus T1, it can be preliminarily determined that a thin layer of frost has formed on the outdoor heat exchanger pipe. Whether the frost thickness meets the requirements for activating the defrost mode requires further assessment of the indoor heat exchanger pipe temperature. The defrost mode is activated when the indoor heat exchanger pipe temperature is preset to be greater than 40°C. This invention first determines that the outdoor heat exchanger pipe has slight frost by detecting its temperature, and then detects the temperature change of the indoor heat exchanger pipe. A small change indicates sufficient indoor heating capacity. When slight frost is detected on the outdoor heat exchanger pipe, the defrost mode is not activated directly. Instead, it is activated only when the indoor heat exchanger pipe temperature is detected to be higher than the preset temperature. This ensures both indoor heating comfort and delays the frost formation on the outdoor heat exchanger pipe.

[0038] The defrost mode of an air conditioner ensures the stability, efficiency, and comfort of heating in winter. This invention precisely monitors and actively suppresses frost formation on the outdoor heat exchange pipe, preventing frost from hindering heat exchange and reducing heating efficiency. This ensures a continuous, stable, and sufficient supply of heat indoors, preventing issues like cold airflow or room temperature fluctuations caused by excessive frost buildup. Simultaneously, it reduces the increased operating load on the equipment due to frost, preventing compressor overload, thus lowering energy consumption, reducing equipment failure risks, and extending the air conditioner's lifespan. Furthermore, the defrost mode reduces the frequency of defrosting mode activation, avoiding brief pauses in heating or cold air blowing during defrosting, making the heating process more continuous and further enhancing the user's comfort experience when using the air conditioner in winter.

[0039] Furthermore, step 400 may include, but is not limited to, steps S410 to S430.

[0040] Step S410: Obtain the temperature of each indoor heat exchange tube at unit time intervals.

[0041] For example, the temperature of the indoor heat exchanger tube can indirectly reflect the frosting condition of the outdoor heat exchanger tube. In some embodiments, during the defrosting mode, the present invention determines the degree of frosting on the outdoor heat exchanger tube by detecting the temperature change of the indoor heat exchanger tube per unit time.

[0042] Step S420: Calculate the temperature difference of the indoor heat exchange tubes at adjacent times.

[0043] It's easy to understand that the time difference between adjacent times can be five or ten minutes. If the temperature of the indoor heat exchanger tube changes significantly within an adjacent time period, it indicates that the outdoor heat exchanger tube is severely frosted. In some embodiments, the temperature of the first indoor heat exchanger tube is 42°C, and the temperature of the second indoor heat exchanger tube is 40°C. The temperature difference between the two indoor heat exchanger tubes at adjacent times is -2°C, which equals t2. Therefore, it can be determined that the outdoor heat exchanger tube is severely frosted and the defrosting mode needs to be activated.

[0044] Step S430: Calculate the temperature change rate of the indoor heat exchange tube based on the temperature difference of the indoor heat exchange tube at adjacent times.

[0045] Furthermore, the temperature change rate of the indoor heat exchanger tube can serve as a key reference indicator for predicting the frosting trend of the outdoor heat exchanger tube and optimizing the timing of the defrosting mode activation. As an optional implementation, by detecting the temperature change of the indoor heat exchanger tube per unit time, the indoor temperature during the defrosting process can be controlled more precisely, reducing the impact of defrosting on user heating comfort. The thickness of the frost on the outdoor unit is determined by detecting the temperature change of the indoor heat exchanger tube per unit time. A rapid drop in the temperature of the indoor heat exchanger tube per unit time indicates a severe decline in the air conditioner's heating performance, indicating severe frost buildup on the outdoor unit. Therefore, this invention can more accurately meet the heating needs of the indoor environment.

[0046] Furthermore, step S500 may include, but is not limited to, steps S510 to S550.

[0047] If the temperature change rate of the indoor heat exchanger tube is greater than the preset temperature threshold, it is determined that the frost thickness of the outdoor heat exchanger tube has reached the defrosting requirement, and the air conditioner defrosting mode is activated.

[0048] In some embodiments, t2 is a preset temperature threshold. The value of t2 is determined according to the environment of the user's region. The temperature change rate of the indoor heat exchanger tube is different in each region. As a specific embodiment, the present invention sets t2 to -2 per unit time. That is, if the temperature of the indoor heat exchanger tube drops by two degrees in the next unit time, it means that the outdoor heat exchanger tube has been severely frosted and needs to be defrosted.

[0049] As an optional implementation, the frosting of the outdoor heat exchanger pipe is accurately determined by the temperature change rate of the indoor heat exchanger pipe. This invention performs temperature detection at unit intervals, calculates the temperature difference of the indoor heat exchanger pipe in adjacent unit times, and converts it into the temperature change rate of the indoor heat exchanger pipe. During heating, if the temperature of the indoor heat exchanger pipe drops rapidly due to frosting, and the cooling rate exceeds the equipment's set threshold within a short period, it can be determined that the outdoor heat exchanger pipe is frosting rapidly and has affected heat exchange efficiency, thus triggering the defrosting mode. During defrosting, the pipe temperature will rapidly rise from a low temperature, and its temperature change rate will be monitored in real time. When the temperature rise rate tends to level off, indicating that the frost has basically melted, or when the preset recovery rate standard is reached, the system will determine that defrosting is complete, automatically exit the defrosting mode, and resume normal heating. This avoids excessive defrosting affecting indoor temperature stability. This invention ensures that the air conditioner can switch modes promptly, defrosting in a timely manner without causing discomfort due to excessive defrosting, thus improving user comfort when using the air conditioner.

[0050] Step S510: Control the four-way valve to cut off power, switch from heating mode to cooling mode, and deliver high-temperature refrigerant gas to the outdoor unit.

[0051] In some embodiments, during the defrosting process, the four-way valve is first de-energized. By changing the conduction direction of the valve core inside the four-way valve, the high-temperature and high-pressure refrigerant gas after switching no longer flows to the indoor heat exchanger, but is directly delivered to the outdoor heat exchanger. The high temperature of the refrigerant itself melts the frost condensed on the surface of the outdoor heat exchanger, clearing the way for the subsequent restoration of normal heating and ensuring heat exchange efficiency.

[0052] Step S520: Control the outdoor fan to stop operating.

[0053] In some embodiments, shutting down the outdoor fan can prevent cold air from carrying away the defrosting heat. Further, as an optional implementation, when the air conditioning system meets preset shutdown conditions, the controller cuts off the power supply to the outdoor fan's drive circuit by outputting a pulse-width modulation signal or a switching command, causing the fan motor to stop rotating and providing a safe operating basis for subsequent defrosting operations or fan restart.

[0054] Step S530: Control the compressor to keep running.

[0055] In some embodiments, keeping the compressor running provides the heat source required for the defrosting mode. Further, as an optional implementation, when the air conditioner is in defrosting mode and the outdoor fan has been stopped, the controller continuously sends operating commands to the compressor based on the system's thermal cycle stability requirements and defrosting efficiency optimization goals. By maintaining a stable power supply to the compressor drive circuit and a preset operating frequency, the controller ensures the compressor remains continuously running, allowing the refrigerant to continuously circulate in the system loop. The heat generated by the compressor's work raises the temperature of the outdoor heat exchanger tube, providing continuous heat energy for frost melting. This also avoids system pressure fluctuations, component wear, and energy efficiency degradation caused by frequent compressor starts and stops, ensuring the continuity and efficiency of the defrosting process. Once the frost has completely melted or the system detects that the outdoor heat exchanger tube temperature has risen back to a preset threshold, the system switches to the normal operating mode according to a preset program.

[0056] Step S540: Control the electronic expansion valve to switch to the defrosting-specific opening.

[0057] In some embodiments, after the defrosting mode is activated, the system immediately switches the electronic expansion valve from the operating opening of the previous heating or defrosting stage to a dedicated fixed opening preset for the defrosting scenario. The dedicated opening is usually a large opening, which can ensure that enough refrigerant flows through the outdoor coil for defrosting. After the switch, this dedicated opening will be maintained and operated stably without step adjustment. This allows for precise control of the refrigerant flow and pressure during the defrosting process, ensuring that the high-temperature refrigerant can flow efficiently through the outdoor heat exchanger to quickly melt the frost, while avoiding abnormal flow affecting the defrosting effect or equipment stability.

[0058] Step S550: Adjust the indoor fan according to the temperature of the indoor heat exchange tube.

[0059] Optionally, during air conditioning operation, the controller collects real-time temperature data of the heat exchanger tubes via temperature sensors installed on the indoor heat exchanger tubes. Combined with a preset temperature threshold range, the controller dynamically adjusts the operating status of the indoor fan. Further, as an optional implementation, when the indoor heat exchanger tube temperature is detected to be higher than the upper threshold, the controller outputs a command to increase the fan speed, increasing indoor air circulation to enhance heat exchange efficiency and quickly lower the heat exchanger tube temperature to the target range. If the heat exchanger tube temperature is lower than the lower threshold, the fan speed is reduced or maintained at the minimum operating speed to decrease airflow and slow down the heat exchange rate, preventing excessive temperature drop that could reduce indoor comfort. When the temperature is within the target range, the current fan speed is maintained to maintain system thermal balance. Through closed-loop regulation, precise matching between the indoor heat exchanger tube temperature and the fan operating status is achieved, balancing heat exchange efficiency and indoor environmental comfort.

[0060] Furthermore, step 550 may include, but is not limited to, steps S551 to S552.

[0061] Step S551: If the temperature of the indoor heat exchange tube is greater than the temperature threshold of the indoor heat exchange tube when the indoor fan is stopped, the indoor unit air guide plate will operate in its original state, the indoor fan will operate at a medium-low speed to blow the residual heat of the coil into the room, and the electric heating will be turned on.

[0062] In some embodiments, after the defrosting mode is activated, the system monitors the temperature of the indoor heat exchange tubes in real time to determine whether it is necessary to switch operating modes. For example, if the detected temperature is higher than the preset indoor fan shutdown threshold, i.e., the tube temperature is not low enough to require shutdown protection, the indoor unit's air guide plate remains unchanged from its previous heating state, and the indoor fan switches to medium-low speed continuous operation. This not only blows the residual heat on the heat exchange tubes into the room to reduce the drop in room temperature, but also simultaneously activates the electric heating function to further supplement the indoor heat, minimizing the impact of the defrosting process on indoor heating comfort.

[0063] Step S552: If the temperature of the indoor heat exchange tube is lower than the temperature threshold of the indoor heat exchange tube when the indoor fan stops, then stop the indoor fan, put the air guide plate in the anti-cold air state, and turn off the electric heating.

[0064] In some embodiments, when the defrosting mode is running, the system continuously monitors the temperature of the indoor heat exchange pipe. If the temperature is detected to be lower than the preset indoor fan shutdown threshold, that is, the pipe temperature is low enough to blow out cold air, the indoor fan will be stopped immediately. At the same time, the indoor unit's air guide plate will be switched to the anti-cold air exclusive state, which is usually closed or upward airflow posture to avoid cold air blowing directly. The electric heating function will also be turned off at the same time. Through the combination of shutdown, air guide plate adjustment and electric heating shutdown, low-temperature cold air is prevented from entering the room, ensuring the user's heating comfort.

[0065] Step S600: Obtain the defrosting time and the temperature of the outdoor heat exchanger tube.

[0066] For example, the defrosting time and outdoor heat exchanger tube temperature can be obtained through a combination of sensor detection and program timing in the air conditioning control system. The outdoor heat exchanger tube temperature is collected in real time by a temperature sensing bulb or thermistor attached to the tube body, and the temperature signal is continuously converted into an electrical signal and transmitted to the controller to accurately reflect the tube body temperature under different operating conditions. As a further optional implementation, obtaining the defrosting time and outdoor heat exchanger tube temperature can determine whether the temperature is below the critical frosting temperature before defrosting, and monitor whether the temperature rises back to the exit threshold during defrosting, providing a basis for subsequent defrosting logic optimization.

[0067] Step S700: When the temperature of the outdoor heat exchanger tube is greater than the temperature threshold of the outdoor heat exchanger tube before exiting the defrost mode, or when the defrost duration is greater than the defrost mode running time threshold before exiting the defrost mode, the defrost mode is exited and heating continues.

[0068] In some embodiments, during defrosting mode operation, the system simultaneously monitors two key indicators: the temperature of the outdoor heat exchanger pipe and the cumulative duration of defrosting mode operation. For example, when the temperature of the outdoor heat exchanger pipe rises and exceeds a preset defrosting exit temperature threshold, indicating that the frost has largely melted and the heat exchange capacity of the outdoor heat exchanger has recovered, or when the defrosting duration reaches a preset exit time threshold to avoid excessive defrosting affecting the user experience, the system will immediately exit defrosting mode. The four-way valve will be re-energized and switched back to the heating cycle, the electronic expansion valve will be adjusted to the opening corresponding to heating, and the indoor fan, air guide plate, and electric heater will simultaneously return to their pre-defrosting heating operation state, continuing to deliver heat to the room.

[0069] In this embodiment of the invention, after the defrosting mode has been running for eight minutes, the temperature of the outdoor heat exchange tube is continuously monitored. If the temperature of the outdoor heat exchange tube is 13°C, which is greater than t3, the defrosting mode can be exited directly. Alternatively, the defrosting mode can be exited directly after running for ten minutes.

[0070] Figure 4 An example of the anti-frost method of the present invention is given, combined with Figure 4 The invention provides detailed explanations and descriptions of defrosting methods and specific air conditioning usage scenarios, illustrating the solutions of this embodiment. Please refer to... Figure 4 The method for inhibiting frost includes: Step 1: When T_outer ring = 1℃, is in T_outer ring interval 1, T_outer tube = -5℃, T_inner tube front = 42℃, T_inner tube current = 40℃, running time t = 38min, electronic expansion valve opening = 320B, T_outer tube is checked every 1min. 外环 T 外管 T 内管 ; Preset parameters: T1=4, T2=-2, T3=10, t1=40min, t2=10min, T 内管min =38°.

[0071] Step Two: Monitor relevant values ​​during heating operation: T 外管 =-5°, less than 1°-4° (T) 外环 -T1) indicates that a thin layer of frost has formed on the outdoor heat exchange pipe. △T 内管 =-2, equals T2.

[0072] Step 3: Run the defrost mode, increase the opening of the electronic expansion valve to a maximum of 370°B; after running for 25 minutes, T is detected. 内管 =39°, greater than T 内管min =38°C, not meeting the conditions for entering defrost mode, therefore continue in anti-frost mode. After running for another 20 minutes, T was detected. 内管=37°, less than T 内管min =38°C, indicating severe frost buildup on the outdoor heat exchanger, which has affected indoor heating comfort, and the heating mode has been running for 45 minutes > t1.

[0073] Step 4: Due to T 内管 =37°, greater than T 内管_low (36°), so the indoor unit's air guide plate operates in its original state, and the indoor fan operates at a medium-low speed to blow the residual heat of the coil into the room. At the same time, the electric heating is turned on to maintain the heat transfer in the room until T_indoor_pipe < T_indoor_pipe_low, and then the indoor fan is turned off.

[0074] Step 5: After running for 8 minutes, if T_outer_tube = 11° is detected, which is greater than T3, exit the defrosting mode; or, when the defrosting mode has been running for 10 minutes (greater than or equal to T3), exit the defrosting mode.

[0075] Among them, T 内min The temperature threshold for the indoor heat exchanger tubes to enter defrost mode, T 内low The temperature threshold of the indoor heat exchanger tube when the indoor fan stops, T_ exit t1 is the temperature threshold for exiting defrost mode, t2 is the operating time threshold for entering defrost mode, and t3 is the operating time threshold for exiting defrost mode. 内min >T 内low T1 is the first temperature threshold, used to help determine whether to activate the defrost mode; T2 is the second temperature threshold, used to help determine whether to activate the defrost mode; T3 is the third temperature threshold, used to help determine whether to deactivate the defrost mode, where T2 is a negative number, T... 外环 It refers to the outdoor ambient temperature, T. 外管 It is the temperature of the outdoor heat exchanger pipe, T 内管 It is the temperature of the indoor heat exchanger tube, t 制热 The running time in heating mode, t 化霜 This refers to the defrost mode runtime.

[0076] Figure 2 Please refer to the structural diagram of an air conditioning defrosting control system provided in this application embodiment. Figure 2 This application also provides an air conditioning defrosting control system, which can implement the above-mentioned air conditioning defrosting control method. The air conditioning defrosting control system includes: The first data acquisition module is used to acquire the temperature of the outdoor heat exchanger pipe. The second data acquisition module is used to acquire the temperature of the indoor heat exchanger when the temperature of the outdoor heat exchanger is lower than the first preset value. The defrost control module is used to activate the defrost mode when the temperature of the indoor heat exchange tube is lower than the preset temperature. The third data acquisition module is used to acquire the temperature change rate of the indoor heat exchange tube when the air conditioner is in the defrost mode. The defrosting control module is used to control the air conditioner to start the defrosting mode when the temperature change rate of the indoor heat exchange tube meets the preset requirements.

[0077] This application also provides an electronic device, including a processor and a memory, wherein the memory is used to store computer program code, the computer program code including computer instructions, and an air conditioner defrosting control method is implemented when the processor executes the computer program.

[0078] refer to Figure 3 The electronic device 2 includes a processor 21, a memory 22, an input device 23, and an output device 24. The processor 21, memory 22, input device 23, and output device 24 are coupled together via connectors, which may include various interfaces, transmission lines, or buses, etc., and are not limited in this embodiment of the invention. It should be understood that in the various embodiments of the invention, coupling refers to mutual connection through a specific method, including direct connection or indirect connection through other devices, such as through various interfaces, transmission lines, buses, etc.

[0079] The processor 21 can be one or more graphics processing units (GPUs). If the processor 21 is a GPU, the GPU can be a single-core GPU or a multi-core GPU. Optionally, the processor 21 can be a processor group composed of multiple GPUs, with the multiple processors coupled to each other via one or more buses. Optionally, the processor can also be other types of processors, etc., and this embodiment of the invention is not limited thereto.

[0080] The memory 22 can be used to store computer program instructions, as well as various types of computer program code, including program code for executing the present invention. Optionally, the memory includes, but is not limited to, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), or compact disc read-only memory (CD-ROM), which is used for related instructions and data.

[0081] Input device 23 is used to input data and / or signals, and output device 24 is used to output data and / or signals. Output device 24 and input device 23 can be independent devices or an integrated device.

[0082] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described air conditioning defrosting control method.

[0083] It is understood that the content of the above method embodiments is applicable to this storage medium embodiment. The specific functions implemented in this storage medium embodiment are the same as those in the above method embodiments, and the beneficial effects achieved are also the same as those achieved in the above method embodiments.

[0084] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. An air conditioning defrosting control method characterized by comprising: The method comprises the following steps: acquiring the temperature of the outdoor heat exchange pipe; acquiring the temperature of the indoor heat exchange pipe when the temperature of the outdoor heat exchange pipe is less than a first preset value; starting the frost suppression mode when the temperature of the indoor heat exchange pipe is less than a preset temperature; acquiring the temperature change rate of the indoor heat exchange pipe when the air conditioner is in the frost suppression mode; starting the defrosting mode of the air conditioner when the temperature change rate of the indoor heat exchange pipe meets a preset requirement.

2. The defrosting control method of an air conditioner according to claim 1, characterized by, The step of acquiring the temperature change rate of the indoor heat exchange pipe when the air conditioner is in the frost suppression mode comprises the following steps: acquiring the temperature of each indoor heat exchange pipe every unit time; calculating the temperature difference of the indoor heat exchange pipe between adjacent times; calculating the temperature change rate of the indoor heat exchange pipe according to the temperature difference of the indoor heat exchange pipe between adjacent times.

3. The defrosting control method of an air conditioner according to claim 2, wherein The step of starting the defrosting mode of the air conditioner when the temperature change rate of the indoor heat exchange pipe meets a preset requirement comprises the following steps: if the temperature change rate of the indoor heat exchange pipe is greater than a preset temperature threshold, determining that the frost thickness of the outdoor heat exchange pipe reaches the defrosting requirement, and starting the defrosting mode of the air conditioner.

4. The defrosting control method of an air conditioner according to claim 3, wherein The step of starting the defrosting mode of the air conditioner comprises the following steps: controlling the four-way valve to be powered off, switching from the heating mode to the refrigeration mode, and delivering high-temperature refrigerant gas to the outdoor unit; controlling the outdoor fan to stop running; controlling the compressor to keep running; controlling the electronic expansion valve to switch to a defrosting special opening degree; adjusting the indoor fan according to the temperature of the indoor heat exchange pipe.

5. The defrosting control method of an air conditioner according to claim 4, wherein The step of adjusting the indoor fan according to the temperature of the indoor heat exchange pipe comprises the following steps: if the temperature of the indoor heat exchange pipe is greater than the temperature threshold of the indoor heat exchange pipe corresponding to the shutdown of the indoor fan, controlling the indoor air deflector to run in the original state, controlling the indoor fan to run at a medium or low speed, blowing the coil heat into the room, and starting the electric heating; if the temperature of the indoor heat exchange pipe is less than the temperature threshold of the indoor heat exchange pipe corresponding to the shutdown of the indoor fan, stopping the indoor fan, making the air deflector be in the cold wind prevention state, and turning off the electric heating.

6. The defrosting control method of an air conditioner according to claim 1, wherein The step of starting the frost suppression mode when the temperature of the indoor heat exchange pipe is greater than a preset temperature comprises the following steps: controlling the electronic expansion valve to increase the opening degree in a step-by-step manner on the basis of the initial opening degree until reaching an upper limit of the opening degree increase; the upper limit of the opening degree increase comprises an upper limit of the increase corresponding to the current outdoor environment temperature.

7. The defrosting control method of an air conditioner according to claim 1, wherein After the step of starting the defrosting mode of the air conditioner according to the frost condition of the outdoor heat exchange pipe, the method further comprises the following steps: acquiring the defrosting time length and the temperature of the outdoor heat exchange pipe; when the temperature of the outdoor heat exchange pipe is greater than the temperature threshold of the outdoor heat exchange pipe for exiting the defrosting mode or the defrosting time length is greater than a defrosting mode running time threshold for exiting the defrosting mode, exiting the defrosting mode and continuing the heating.

8. The defrosting control method of an air conditioner according to claim 1, wherein After the step of acquiring the temperature of the indoor heat exchange pipe when the temperature of the outdoor heat exchange pipe is less than a threshold, the method further comprises the following step: when the temperature of the indoor heat exchange pipe is less than a second preset value, directly entering the defrosting mode.

9. An air conditioning defrosting control system, characterized by, The method comprises the following steps: a first data acquisition module for acquiring the temperature of the outdoor heat exchange pipe a second data acquisition module for acquiring the temperature of the indoor heat exchange pipe when the temperature of the outdoor heat exchange pipe is less than a first preset value; a frost suppression control module for starting the frost suppression mode when the temperature of the indoor heat exchange pipe is less than a preset temperature; a third data acquisition module for acquiring the temperature change rate of the indoor heat exchange pipe when the air conditioner is in the frost suppression mode; The defrosting control module is used for controlling the air conditioner defrosting mode to be started when the temperature change rate of the indoor heat exchange pipe meets preset requirements.

10. An electronic device, comprising: The method comprises the following steps: A processor and a memory are provided, the memory is used for storing computer program code, the computer program code comprises computer instructions, and the processor executes the computer program to realize the air conditioner defrosting control method according to any one of claims 1 to 7.

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