Air conditioner, control method thereof, computer device and readable storage medium

Abstract

This invention provides an air conditioner and its control method, computer device, and readable storage medium. The control method includes executing intelligent sensing and dynamic purging steps in defrost mode. The intelligent sensing and dynamic purging steps include: acquiring the current outdoor heat exchanger temperature and the current ambient humidity change rate, and determining whether the following two conditions are met: the first condition is that the current outdoor heat exchanger temperature reaches a first preset temperature value, or the outdoor heat exchanger temperature rise rate reaches a preset rate threshold; the second condition is that the current humidity change rate reaches a preset humidity change threshold. If the above two conditions are met, the outdoor fan starts in reverse mode. This control method solves the problem of low defrosting efficiency, achieves precise defrosting on demand, avoids ineffective heat loss, eliminates the risk of secondary icing, achieves efficient drainage, and also has energy-saving effects.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more specifically, to an air conditioner and its control method, computer device and readable storage medium. Background Technology

[0002] In equipment requiring heat exchange, such as refrigeration systems, air conditioning systems, and heat pump systems, when the surface temperature of the heat exchanger is lower than the ambient dew point and below 0°C, water vapor in the air will condense on the heat exchanger surface, forming a frost layer. The presence of this frost layer increases thermal resistance, reduces heat exchange efficiency, and increases air resistance, severely impacting the equipment's operating performance and energy efficiency. Therefore, timely and effective defrosting is one of the key technologies for ensuring the reliable operation of refrigeration / heat pump equipment.

[0003] In the existing technology, several defrosting control schemes have been disclosed. For example, some solutions use both temperature and humidity as indicators to determine the frosting state. By monitoring changes in the surface temperature of the heat exchanger and the ambient humidity, the degree of frosting is determined, thereby triggering the defrosting operation. In addition, some solutions disclose using a fan to reverse and purge water after defrosting. The reverse airflow blows the condensate produced during defrosting out of the heat exchanger, preventing residual water from refreezing.

[0004] However, existing technologies have at least the following technical problems: First, the timing of switching between defrosting and purging is rigid. Current technologies typically employ a fixed defrosting duration control strategy, such as pre-setting a 3-minute defrosting period followed by a forced fan reversal for purging. However, in real-world applications, the rate of ice melting is greatly influenced by various environmental factors, including ambient temperature, wind speed, initial frost thickness, and heat exchanger structure. A fixed defrosting duration cannot adapt to complex and variable operating conditions: if the defrosting time is set too short, the ice will not melt completely, and purging will not effectively remove moisture, failing to achieve the expected drainage effect; if the defrosting time is set too long, it results in unnecessary energy waste and excessive drop in indoor temperature, affecting user experience and equipment operational stability.

[0005] Secondly, there is a lack of dynamic perception of the phase transition process. The process of ice melting into water is a violent physical phase transition process, during which the ambient humidity fluctuates dramatically. This dynamic physical characteristic could serve as an important control signal for judging the defrosting process, but current technologies have not effectively utilized this characteristic and have failed to organically combine humidity changes during the phase transition process with defrosting control strategies, resulting in a lack of real-time and accurate physical basis for defrosting control.

[0006] Secondly, there is a risk of secondary icing. Because it's impossible to accurately determine whether defrosting is complete and whether residual water has been completely drained, traditional timed purging methods often suffer from timing discrepancies: either purging is started before the ice has completely melted, which actually draws away heat and hinders the defrosting process; or purging is not started in time after defrosting is complete, causing residual condensate to refreeze in the low-temperature environment, resulting in secondary icing. Both of these problems lead to low defrosting efficiency and make it difficult to guarantee defrosting effectiveness.

[0007] Therefore, how to achieve real-time perception of the melting state of the ice layer and dynamically trigger purging actions accordingly is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0008] The primary objective of this invention is to provide a control method for an air conditioner that solves the problem of low defrosting efficiency, achieves precise defrosting on demand, avoids ineffective heat loss, eliminates the risk of secondary icing, achieves efficient drainage, and also has energy-saving effects.

[0009] A second objective of the present invention is to provide an air conditioner that implements the control method described above.

[0010] A third objective of the present invention is to provide a computer device for implementing the control method described above.

[0011] A fourth objective of this invention is to provide a readable storage medium for implementing the control method described above.

[0012] To achieve the first objective mentioned above, the present invention provides a control method for an air conditioner, comprising: In defrost mode, intelligent sensing and dynamic purging steps are performed; The intelligent sensing and dynamic purging process includes: Get the current outdoor heat exchanger temperature and the current ambient humidity change rate, and determine whether the following two conditions are met simultaneously: the first condition is that the current outdoor heat exchanger temperature reaches the first preset temperature value, or the outdoor heat exchanger temperature rise rate reaches the preset rate threshold; the second condition is that the current humidity change rate reaches the preset humidity change threshold. If both of the above conditions are met simultaneously, the outdoor fan will start in reverse mode.

[0013] As can be seen from the above scheme, after entering the later stage of defrosting, the system executes the core intelligent sensing and dynamic purging steps. The main controller obtains the temperature of the outdoor heat exchanger in real time and calculates the humidity change rate of the current environment. The physical basis is that: during the process of ice melting into water, a violent solid-liquid phase transition occurs, accompanied by the absorption of a large amount of latent heat and the evaporation of water, which causes the humidity to fluctuate violently in a short period of time. The humidity change rate increases from small to large. When the ice melts completely, the humidity change rate reaches its peak. Then, as the water production rate begins to decrease, the humidity change rate begins to decrease. At the same time, during the phase transition process of ice melting into water, the surface temperature of the outdoor heat exchanger forms a plateau period near 0°C with small fluctuations. When the phase transition is completed, that is, when the ice has just melted, the surface temperature of the outdoor heat exchanger breaks through the phase transition plateau and begins to rise rapidly, and the temperature change rate reaches its peak. The main control module sets a temperature value and a humidity mutation threshold (i.e., peak value) and enters the observation logic: if the current outdoor heat exchanger temperature has risen but the humidity change rate is lower than the preset humidity mutation threshold, it indicates that the ice layer has not completely liquefied or a large amount of water has not been generated. At this time, the system keeps the outdoor fan off and continues heating to prevent premature airflow from causing heat loss. If the current outdoor heat exchanger temperature reaches the first preset temperature value or the outdoor heat exchanger temperature rise rate reaches the preset rate threshold, and the current humidity change rate reaches the preset humidity mutation threshold, it is determined that the ice layer has completely melted and the liquid water is in a flowing state, which is the best time for drainage. Then, the main control module controls the indoor and outdoor units to start the reverse mode operation, using reverse airflow to forcefully blow out the residual water that is dripping or evaporating in the fin gaps.

[0014] The control method of this invention is a defrosting control method for outdoor air conditioning units based on sensing the phase change process. Based on a dynamic fan triggering mechanism using the humidity change rate, during the defrosting process, not only is the heat exchanger temperature and ambient humidity monitored, but the humidity change rate is also calculated. By limiting the humidity change rate and temperature threshold, the defrosting state of the frost layer is determined, and the optimal blowing time is determined. That is, by monitoring the dynamic changes in the surface temperature of the heat exchanger and the ambient humidity in real time, the humidity change rate is used to accurately determine the melting state of the ice layer, thereby optimizing the defrosting process, solving the problem of low defrosting efficiency, achieving the effect of precise defrosting on demand, avoiding ineffective heat loss, eliminating the risk of secondary icing, and achieving efficient drainage.

[0015] Meanwhile, the control method of the present invention solves the problems of incomplete or excessive defrosting caused by relying solely on a fixed duration or a single temperature threshold in the prior art, as well as the misjudgment problem caused by environmental humidity fluctuations (such as rain or fog) in traditional solutions. It also solves the problem of sensor failure in harsh outdoor unit environments (low temperature, high humidity, strong wind), and the problem of refreezing of residual moisture after defrosting due to the lack of a secondary icing prevention mechanism in the prior art.

[0016] A preferred solution is that the outdoor fan operates in reverse mode for a first preset period of time; Once again, obtain the current outdoor heat exchanger temperature, current ambient humidity, and the rate of change of current ambient humidity; Determine whether at least one of the following three conditions is met: Condition 1, the current outdoor heat exchanger temperature is greater than or equal to the second preset temperature value; Condition 2, the current ambient humidity is less than or equal to the first preset humidity value; Condition 3, the current humidity change rate is less than the preset humidity change rate. If at least one of conditions two and three is met, and condition one is also met, then exit defrost mode.

[0017] Therefore, after the outdoor fan operates in reverse mode, the main control module continues to monitor parameter changes to confirm the thoroughness of defrosting. It obtains the current outdoor heat exchanger temperature, current ambient humidity, and current ambient humidity change rate again, and judges whether the preset conditions are met based on the detected values. When the preset conditions are met, it means that there is no residual moisture on the surface of the outdoor heat exchanger fins and no risk of secondary icing. At this time, the main control module immediately controls the four-way reversing valve to reset, exits the defrosting mode, switches back to the normal heating cycle, and simultaneously restarts the outdoor fan to the forward rotation working state.

[0018] A further option is that the second preset temperature value is 3°C to 10°C; and / or The first preset humidity value is 30% to 70%; and / or The preset humidity change rate is 0.1% / second to 3% / second; and / or The first preset time period is 10 to 50 seconds.

[0019] A further option is to set the second preset temperature value to 4°C to 8°C; and / or The first preset humidity value is 40% to 60%; and / or The preset humidity change rate is 0.2% / second to 2% / second; and / or The first preset time period is 15 to 30 seconds.

[0020] A preferred solution is that if the defrosting mode runs for the preset defrosting time but the conditions for exiting the defrosting mode are not met, the system will be forced to exit the defrosting mode and an alarm signal will be issued.

[0021] Therefore, if the defrosting mode operation time reaches the preset defrosting duration and the stopping condition is not met, the system will forcibly exit the defrosting mode and issue an alarm signal to prevent the compressor from overheating or consuming too much energy.

[0022] A preferred embodiment is that the control method further includes performing a pure heating defrosting step in defrosting mode; When the pure heating defrosting step reaches the preset base duration or the current outdoor heat exchanger temperature reaches the third preset temperature value, the intelligent sensing and dynamic purging step is executed.

[0023] A preferred embodiment is that the control method further includes: If the current outdoor heat exchanger temperature is less than or equal to the fourth preset temperature value, the current ambient humidity is greater than or equal to the second preset humidity value, and the duration reaches the second preset time period, then the defrosting mode will be entered. The duration is the time during which the heat exchanger temperature is less than or equal to the fourth preset temperature value and the current ambient humidity is greater than or equal to the second preset humidity value.

[0024] Therefore, if the current outdoor heat exchanger temperature is less than or equal to the fourth preset temperature value, the current ambient humidity is greater than or equal to the second preset humidity value, and the duration reaches the second preset time period, it indicates that severe frost has formed on the surface of the outdoor heat exchanger fins, and defrosting can be performed by entering the defrost mode.

[0025] A further option is that the fourth preset temperature value is -2℃ to 2℃; and / or The second preset humidity value is 55% to 85%; and / or The second preset time period is 20 to 40 seconds.

[0026] A preferred embodiment is that the outdoor fan operates in reverse mode at 50% to 100% of its rated speed; and / or The first preset temperature value is 5℃ to 10℃; and / or The preset humidity change threshold is in the range of 2% / second to 5% / second.

[0027] To achieve the second objective mentioned above, the present invention provides an air conditioner, which includes a processor for executing a program stored in a memory to implement the control method of the air conditioner.

[0028] A preferred embodiment is that the air conditioner includes a temperature sensor located in the return air duct of the outdoor heat exchanger; and / or The air conditioner includes a humidity sensor, which is located on the air inlet side of the outdoor heat exchanger.

[0029] A further approach is to incorporate a miniature heating wire into at least one of the temperature and humidity sensors.

[0030] Therefore, the temperature sensor is attached to the return air pipe of the outdoor heat exchanger and is used to collect the surface temperature of the outdoor heat exchanger. The humidity sensor is used to collect the ambient humidity. When the ambient temperature is below 0℃, the heating function is automatically activated to prevent frost or condensation on the probe, which could cause data distortion.

[0031] A preferred solution is to turn on the miniature heating wire for heating when the ambient temperature is below 0°C.

[0032] To achieve the third objective described above, the present invention provides a computer device including a processor, which executes a program stored in a memory to implement the control method described above.

[0033] To achieve the fourth objective mentioned above, the present invention provides a readable storage medium on which a program is stored, and when the program is executed by a processor, it implements the control method described above. Attached Figure Description

[0034] Figure 1 This is a flowchart of an embodiment of the control method of the present invention.

[0035] Figure 2 This is a flowchart of the intelligent sensing and dynamic purging steps in the embodiment of the control method of the present invention.

[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0037] Various exemplary embodiments of the invention will now be described in detail with reference to the accompanying drawings. The descriptions of the exemplary embodiments are merely illustrative and are in no way intended to limit the invention or its application or use. The invention can be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the invention thorough and complete, and to fully express the scope of the invention to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, the composition of materials, numerical expressions, and values ​​set forth in these embodiments should be interpreted as merely exemplary and not as limiting.

[0038] The terms "first," "second," and similar words used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Words such as "including" or "comprising" mean that the element preceding the word encompasses the element listed after it, without excluding the possibility of encompassing other elements. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0039] In this invention, when a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other devices without an intermediary device, or it may be not directly connected to the other devices but have an intermediary device.

[0040] All terms used in this invention (including technical or scientific terms) have the same meaning as understood by one of ordinary skill in the art, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having the meaning consistent with their meaning in the context of the relevant art, and not as having an idealized or highly formalized meaning, unless expressly defined herein.

[0041] 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.

[0042] Examples of air conditioners and their control methods: The air conditioner in this embodiment includes an outdoor fan, an outdoor heat exchanger, a temperature sensor, a humidity sensor, and a processor.

[0043] An outdoor fan is located on the outlet side of the outdoor heat exchanger, and a temperature sensor is installed in the return air duct of the outdoor heat exchanger to collect the surface temperature of the outdoor heat exchanger. A humidity sensor is installed on the inlet side of the outdoor heat exchanger to collect the ambient relative humidity. At least one of the temperature and humidity sensors is equipped with a miniature heating wire. Preferably, in this embodiment, both the temperature and humidity sensors have miniature heating wires inside. When the ambient temperature is below 0°C, the heating function is automatically activated to prevent frost or condensation on the probe, which could lead to data distortion.

[0044] The processor implements the following control method for the air conditioner when executing a program stored in memory.

[0045] See Figure 1 The control method for air conditioners includes the following steps: First, step S1 is executed. In cooling mode, the main control module continuously collects the following data twice per second: the current outdoor heat exchanger temperature and the current ambient humidity. Preferably, the current ambient humidity is absolute humidity. Optionally, the humidity sensor can also collect the absolute humidity of the environment, or collect the relative humidity of the environment and convert it to absolute humidity by converting relative humidity and temperature. Using absolute humidity is not affected by temperature, the signal is clean, and the logic loop is more self-consistent.

[0046] Next, step S2 is executed to determine whether the following three conditions are met simultaneously: the first condition is that the current outdoor heat exchanger temperature is less than or equal to the fourth preset temperature value; the second condition is that the current ambient humidity is greater than or equal to the second preset humidity value; and the third condition is that the duration reaches the second preset time period, which is the time during which both the heat exchanger temperature and the current ambient humidity are greater than or equal to the second preset humidity value. Optionally, the fourth preset temperature value is -2℃ to 2℃, the second preset humidity value is 55% to 85%, and the second preset time period is 20 seconds to 40 seconds. Preferably, the fourth preset temperature value is 0℃, the second preset humidity value is 60%, and the second preset time period is 30 seconds.

[0047] If the conditions of the current outdoor heat exchanger temperature being less than or equal to 0℃ and the current ambient humidity being greater than or equal to 60% are met simultaneously for a duration of 30 seconds, it indicates that severe frost has formed on the surface of the outdoor heat exchanger fins. Step S3 is executed to enter the defrost mode. The main control module controls the four-way reversing valve to switch the system from the cooling mode to the defrost mode.

[0048] In defrost mode, the pure heating defrost step S4 is executed first, which uses the high-temperature refrigerant flowing through the outdoor heat exchanger to defrost.

[0049] Next, step S5 is executed to determine whether the following conditions are met: the running time of the pure heating defrosting step reaches the preset base time or the current outdoor heat exchanger temperature reaches the third preset temperature value. Preferably, the preset base time is 60 to 90 seconds, and the third preset temperature value is 5°C to 8°C.

[0050] If the running time of the pure heating defrosting step reaches the preset base time or the current outdoor heat exchanger temperature reaches the third preset temperature value, then the defrosting stage begins, and the intelligent sensing and dynamic purging step S6 is executed.

[0051] See Figure 2 The intelligent sensing and dynamic purging step S6 includes: First, step S61 is executed to obtain the current outdoor heat exchanger temperature and the current ambient humidity change rate, and to determine whether the following two conditions are met simultaneously: the first condition is that the current outdoor heat exchanger temperature reaches a first preset temperature value, or the outdoor heat exchanger temperature rise rate reaches a preset rate threshold; the second condition is that the current humidity change rate reaches a preset humidity abrupt change threshold. Optionally, the first preset temperature value is between 5℃ and 10℃, and the preset humidity abrupt change threshold is in the range of 2% / second to 5% / second. Preferably, the first preset temperature value is 8℃. The preset temperature abrupt change threshold is the second inflection point of the temperature change rate, that is, the point where the temperature rise rate changes from slow to fast. The preset humidity abrupt change threshold is the peak value of the humidity change rate. After reaching the peak value, the humidity change rate begins to decrease, and the humidity change rate changes from increasing to decreasing. The humidity change rate is the change in absolute humidity or moisture content per unit time, used to reflect the rate of change of moisture content in the air. When the rate of temperature rise of the outdoor heat exchanger exceeds the preset rate threshold and the temperature is higher than the first preset temperature above the freezing point, the temperature leaves the phase change plateau stage. During the ice melting process, due to the heat absorption of the ice crystal phase change, the condenser temperature will remain near the freezing point to form a plateau period until the ice completely melts and the temperature rises rapidly. The phase change plateau stage corresponds to the stage during the ice melting process where the temperature remains near the freezing point.

[0052] If both of the above conditions are met simultaneously, namely, the outdoor heat exchanger temperature breaks through the phase change platform and begins to rise rapidly, and the humidity change rate reaches its peak, that is, the outdoor heat exchanger temperature leaves the phase change platform stage and the humidity change rate meets the preset inflection point condition, then it is determined that the ice layer has completely melted and the liquid water is in a flowing state, which is the best time to drain the water. Then, step S62 is executed, and the outdoor fan starts the reverse mode. In the reverse mode, the rotation direction of the outdoor fan blades is opposite to that of the outdoor fan blades in the heating mode. The outdoor fan rotates in the opposite direction, and the reverse airflow blows directly onto the fins of the outdoor heat exchanger, so that the high-speed airflow blows out the defrost water.

[0053] Next, step S63 is executed. After the outdoor fan operates in reverse mode for a first preset time period, the current outdoor heat exchanger temperature, current ambient humidity, and current ambient humidity change rate are acquired again. Optionally, the first preset time period is 10 to 50 seconds; preferably, the first preset time period is 15 to 30 seconds; the speed of the outdoor fan in reverse mode is 50% to 100% of the rated speed of the outdoor fan; more preferably, the first preset time period is 20 seconds; and the speed of the outdoor fan in reverse mode is 80% of the rated speed of the outdoor fan.

[0054] If the above two conditions cannot be met at the same time, for example, if the current outdoor heat exchanger temperature reaches the first preset temperature value, but the current humidity change rate is less than the preset humidity change threshold, it means that although the current outdoor heat exchanger temperature has increased, the humidity change rate is lower than the preset humidity change threshold, indicating that the ice layer has not been completely liquefied or a large amount of water has not been generated. At this time, the system keeps the outdoor fan off and continues to heat to prevent premature air blowing and heat loss.

[0055] Next, step S64 is executed to determine whether the following three conditions are met: Condition 1, the current outdoor heat exchanger temperature is greater than or equal to the second preset temperature value; Condition 2, the current ambient humidity is less than or equal to the first preset humidity value; Condition 3, the current humidity change rate is less than the preset humidity change rate. Optionally, the second preset temperature value is 3℃ to 10℃, the first preset humidity value is 30% to 70%, and the preset humidity change rate is 0.1% / second to 3% / second. Preferably, the second preset temperature value is 4℃ to 8℃, the first preset humidity value is 40% to 60%, and the preset humidity change rate is 0.2% / second to 2% / second. More preferably, the second preset temperature value is 5℃, the first preset humidity value is 50%, and the preset humidity change rate is 1% / second.

[0056] If at least one of conditions two and three is met, and condition one is also met, then the defrosting mode is exited. For example, when all three conditions are met simultaneously—that is, the current outdoor heat exchanger temperature is greater than or equal to 5°C, the current ambient humidity is less than or equal to 50%, and the current humidity change rate is less than 1% / second—it indicates that there is no residual moisture on the surface of the outdoor heat exchanger fins and no risk of secondary icing. In this case, step S65 is executed, and the main control module immediately controls the four-way reversing valve to reset, exiting the defrosting mode and switching back to the normal heating cycle, and simultaneously restarting the outdoor fan to the forward rotation operating state. In other embodiments, it can also be determined whether at least one of the three conditions in step S64 is met. If at least one condition is met, then the defrosting mode is exited.

[0057] Next, step S66 is executed to determine if the defrosting mode operation time has reached the preset defrosting duration. If the defrosting mode operation time has reached the preset defrosting duration but the conditions for exiting the defrosting mode are still not met, the system is forced to exit the defrosting mode and an alarm signal is issued to prevent the compressor from overheating or consuming too much energy. Optionally, the preset defrosting duration is in the range of 120 to 150 seconds.

[0058] As can be seen from the above, after entering the later stage of defrosting, the system executes the core intelligent sensing and dynamic purging steps. The main controller obtains the temperature of the outdoor heat exchanger in real time and calculates the humidity change rate of the current environment. The physical basis is that: during the process of ice melting into water, a violent solid-liquid phase transition occurs, accompanied by the absorption of a large amount of latent heat and the evaporation of water, which causes the humidity to fluctuate violently in a short period of time. The humidity change rate increases from small to large. When the ice melts completely, the humidity change rate reaches its peak. Then, as the water production rate begins to decrease, the humidity change rate begins to decrease. At the same time, during the phase transition process of ice melting into water, the surface temperature of the outdoor heat exchanger forms a plateau period near 0°C with small fluctuations. When the phase transition is completed, that is, when the ice has just melted, the surface temperature of the outdoor heat exchanger breaks through the phase transition plateau and begins to rise rapidly, and the temperature change rate reaches its peak. The main control module sets a temperature value and a humidity mutation threshold (i.e., peak value) and enters the observation logic: if the current outdoor heat exchanger temperature has risen but the humidity change rate is lower than the preset humidity mutation threshold, it indicates that the ice layer has not completely liquefied or a large amount of water has not been generated. At this time, the system keeps the outdoor fan off and continues heating to prevent premature airflow from causing heat loss. If the current outdoor heat exchanger temperature reaches the first preset temperature value or the outdoor heat exchanger temperature rise rate reaches the preset rate threshold, and the current humidity change rate reaches the preset humidity mutation threshold, it is determined that the ice layer has completely melted and the liquid water is in a flowing state, which is the best time for drainage. Then, the main control module controls the indoor and outdoor units to start the reverse mode operation, using reverse airflow to forcefully blow out the residual water that is dripping or evaporating in the fin gaps.

[0059] The control method of this invention is a defrosting control method for outdoor air conditioning units based on sensing the phase change process. Based on a dynamic fan triggering mechanism using the humidity change rate, during the defrosting process, not only is the heat exchanger temperature and ambient humidity monitored, but the humidity change rate is also calculated. By limiting the humidity change rate and temperature threshold, the defrosting state of the frost layer is determined, and the optimal blowing time is determined. That is, by monitoring the dynamic changes in the surface temperature of the heat exchanger and the ambient humidity in real time, the humidity change rate is used to accurately determine the melting state of the ice layer, thereby optimizing the defrosting process, solving the problem of low defrosting efficiency, achieving the effect of precise defrosting on demand, avoiding ineffective heat loss, eliminating the risk of secondary icing, and achieving efficient drainage.

[0060] Meanwhile, the control method of the present invention solves the problems of incomplete or excessive defrosting caused by relying solely on a fixed duration or a single temperature threshold in the prior art, as well as the misjudgment problem caused by environmental humidity fluctuations (such as rain or fog) in traditional solutions. It also solves the problem of sensor failure in harsh outdoor unit environments (low temperature, high humidity, strong wind), and the problem of refreezing of residual moisture after defrosting due to the lack of a secondary icing prevention mechanism in the prior art.

[0061] Computer device embodiment: The computer device of the present invention is a controller, including a processor and a memory, such as a microcontroller containing a central processing unit. Furthermore, the processor executes a computer program stored in the memory to implement the steps of the aforementioned control method.

[0062] The processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor.

[0063] The memory can primarily include a program storage area and a data storage area. The program storage area can store the operating system and at least one application program required for a function (such as sound playback, image playback, etc.); the data storage area can store data created based on the use of the phone (such as audio data, phonebook, etc.). Furthermore, the memory can include high-speed random access memory, and can also include non-volatile memory, such as hard disks, RAM, plug-in hard disks, smart media cards (SMC), secure digital cards (SD cards), flash cards, at least one disk storage device, flash memory device, or other volatile solid-state storage devices.

[0064] Examples of computer-readable storage media: The computer-readable storage medium of the present invention can be any form of storage medium that can be read by the processor of a computer device, including but not limited to non-volatile memory, volatile memory, ferroelectric memory, etc. The computer-readable storage medium stores a computer program. When the processor of the computer device reads and executes the computer program stored in the memory, the steps of the above control method can be implemented.

[0065] Computer programs include computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. Computer-readable media can include: any entity or device capable of carrying computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. It should be noted that the content included in computer-readable media can be appropriately added to or subtracted according to the requirements of legislation and patent practice in a jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electrical carrier signals and telecommunication signals.

[0066] Finally, it should be emphasized that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A control method for an air conditioner, characterized in that, include: In defrost mode, intelligent sensing and dynamic purging steps are performed; The intelligent sensing and dynamic purging steps include: Get the current outdoor heat exchanger temperature and the current ambient humidity change rate, and determine whether the following two conditions are met simultaneously: the first condition is that the current outdoor heat exchanger temperature reaches the first preset temperature value, or the outdoor heat exchanger temperature rise rate reaches the preset rate threshold; the second condition is that the current humidity change rate reaches the preset humidity change threshold. If both of the above conditions are met simultaneously, the outdoor fan will start in reverse mode.

2. The control method according to claim 1, characterized in that: After the outdoor fan operates in reverse mode for a first preset period of time; Once again, obtain the current outdoor heat exchanger temperature, current ambient humidity, and the rate of change of current ambient humidity; Determine whether the following three conditions are met: Condition 1, the current outdoor heat exchanger temperature is greater than or equal to the second preset temperature value; Condition 2, the current ambient humidity is less than or equal to the first preset humidity value; Condition 3, the current humidity change rate is less than the preset humidity change rate. If at least one of conditions two and three is satisfied, and condition one is also satisfied, then the defrosting mode is exited.

3. The control method according to claim 2, characterized in that: The second preset temperature value is 3°C to 10°C; and / or The first preset humidity value is 30% to 70%; and / or The preset humidity change rate is 0.1% / second to 3% / second; and / or The first preset time period is 10 to 50 seconds.

4. The control method according to claim 3, characterized in that: The second preset temperature value is 4°C to 8°C; and / or The first preset humidity value is 40% to 60%; and / or The preset humidity change rate is 0.2% / second to 2% / second; and / or The first preset time period is 15 to 30 seconds.

5. The control method according to any one of claims 1 to 4, characterized in that: If the defrosting mode runs for the preset defrosting time but the conditions for exiting the defrosting mode are not met, the system will be forced to exit the defrosting mode and an alarm signal will be issued.

6. The control method according to any one of claims 1 to 4, characterized in that: The control method further includes performing a pure heating defrosting step in defrosting mode; When the pure heating defrosting step reaches the preset base duration or the current outdoor heat exchanger temperature reaches the third preset temperature value, the intelligent sensing and dynamic purging step is executed.

7. The control method according to any one of claims 1 to 4, characterized in that: The control method further includes: If the current outdoor heat exchanger temperature is less than or equal to the fourth preset temperature value, the current ambient humidity is greater than or equal to the second preset humidity value, and the duration reaches the second preset time period, then the defrosting mode is entered. The duration is the time during which the heat exchanger temperature is less than or equal to the fourth preset temperature value and the current ambient humidity is greater than or equal to the second preset humidity value.

8. The control method according to claim 7, characterized in that: The fourth preset temperature value is -2℃ to 2℃; and / or The second preset humidity value is 55% to 85%; and / or The second preset time period is 20 to 40 seconds.

9. The control method according to any one of claims 1 to 4, characterized in that: The outdoor fan operates in reverse mode at a speed of 50% to 100% of its rated speed; and / or The first preset temperature value is 5°C to 10°C; and / or The preset humidity change threshold is in the range of 2% / second to 5% / second.

10. An air conditioner, characterized in that: The air conditioner includes a processor that executes a program stored in a memory to implement the control method as described in any one of claims 1 to 9.

11. The air conditioner according to claim 10, characterized in that: The air conditioner includes a temperature sensor, which is disposed in the return air pipe of the outdoor heat exchanger; and / or The air conditioner includes a humidity sensor, which is located on the air inlet side of the outdoor heat exchanger.

12. The air conditioner according to claim 11, characterized in that: At least one of the temperature sensor and the humidity sensor is provided with a miniature heating wire.

13. The air conditioner according to claim 12, characterized in that: When the ambient temperature is below 0°C, the miniature heating wire is turned on for heating.

14. A computer device, characterized in that: The computer device includes a processor that executes a program stored in a memory to implement the control method of the air conditioner as described in any one of claims 1 to 9.

15. A readable storage medium having a program stored thereon, characterized in that: When the program is executed by the processor, it implements the control method for the air conditioner as described in any one of claims 1 to 9.

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