Air conditioner defrosting control method, air conditioner and readable storage medium

Abstract

The application provides an air conditioner defrosting control method, an air conditioner and a readable storage medium. The air conditioner defrosting control method comprises the following steps: controlling the air conditioner to operate in a defrosting mode; when the operation time of the defrosting mode reaches a preset time, acquiring an outer ring temperature, an outer ring relative humidity and an outer tube temperature; if the outer tube temperature is less than or equal to a preset tube temperature and the outer ring relative humidity is greater than or equal to a first preset humidity, determining a frequency variation and an opening variation according to the outer ring temperature and the outer ring relative humidity; and adjusting the frequency of the compressor according to the frequency variation and adjusting the opening of the expansion valve according to the opening variation. The control method of the application determines the frequency variation and the opening variation according to the outer tube temperature, the outer ring temperature and the outer ring relative humidity and other environmental parameters closely related to the current working condition, so that the defrosting is quickly and effectively completed and the defrosting is completely ensured without residue.

Description

Technical Field

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

[0002] In a current air conditioner defrosting control method, upon entering defrosting mode, the relative humidity of the current outdoor environment is acquired, and the defrosting time is determined based on the relative humidity range. If the real-time defrosting time exceeds the standardized defrosting time for the corresponding range, and the outdoor pipe temperature does not exceed a preset value, the defrosting is extended for a first preset duration, and the compressor frequency is increased at a preset rate. If the outdoor pipe temperature still does not exceed the preset value after the first extended defrosting period, the defrosting is further extended, and the expansion valve opening is reduced at a preset rate until the outdoor pipe temperature exceeds the preset value, at which point defrosting is terminated.

[0003] The existing defrosting control method for air conditioners first increases the compressor frequency and then reduces the expansion valve opening as needed. Regardless of the operating conditions, the compressor frequency and expansion valve opening are adjusted at a preset fixed rate, which is not conducive to achieving a better defrosting effect. Moreover, the adjustment is slow, resulting in a long defrosting time and affecting the user experience. Summary of the Invention

[0004] The primary objective of this invention is to provide an air conditioning defrosting control method that improves defrosting efficiency and effectiveness, thereby enhancing the user experience.

[0005] The second objective of this invention is to provide an air conditioner capable of implementing the above-described air conditioning control method.

[0006] A third objective of this invention is to provide a readable storage medium capable of implementing the above-described air conditioning control method.

[0007] The air conditioner defrosting control method provided by the first objective of this invention includes: controlling the air conditioner to operate in defrosting mode; when the defrosting mode operation time reaches a preset time, acquiring the outer ring temperature, outer ring relative humidity, and outer pipe temperature; if the outer pipe temperature is less than or equal to a preset pipe temperature and the outer ring relative humidity is greater than or equal to a first preset humidity, determining the compressor frequency change and the expansion valve opening change based on the outer ring temperature and outer ring relative humidity; increasing the compressor frequency based on the frequency change and decreasing the expansion valve opening based on the opening change.

[0008] As can be seen from the above scheme, the present invention mainly determines a more accurate adjustment amount based on the current operating conditions. After determining whether defrosting needs to continue based on the outer pipe temperature and outer ring relative humidity, if defrosting needs to continue, the frequency change and opening change are further determined based on environmental parameters closely related to the current operating conditions, such as the outer pipe temperature, outer ring temperature, and outer ring relative humidity. Thus, a compressor operating frequency and expansion valve opening that are more matched to the current operating conditions can be calculated, which can quickly and effectively complete defrosting. Furthermore, the present invention also considers the problem that the outer ring temperature and outer ring relative humidity may lead to incomplete defrosting of the paper guide. Therefore, when calculating the compressor operating frequency and expansion valve opening, the outer ring temperature and outer ring relative humidity are used as the main basis to ensure that defrosting is thorough and without residue, and to ensure the heating efficiency of the next heating operation. Whether in the defrosting stage or the heating stage, it brings a better user experience to users. A further approach involves determining the frequency and opening changes based on the outer ring temperature and relative humidity: The frequency and opening changes are determined according to the numerical ranges of the outer ring temperature and relative humidity.

[0009] A further proposed solution involves determining the frequency change and opening change based on the numerical ranges of the outer ring temperature and relative humidity: if the outer ring temperature is lower than a preset temperature and the outer ring relative humidity is greater than or equal to a second preset humidity, the frequency change is determined to be a preset first frequency change, and the opening change is determined to be a preset first opening change; if the outer ring temperature is greater than or equal to a preset temperature and the outer ring relative humidity is greater than or equal to a second preset humidity, the frequency change is determined to be a preset second frequency change, and the opening change is determined to be a preset second opening change; if the outer ring temperature is lower than a preset temperature and the outer ring relative humidity is lower than a second preset humidity but greater than or equal to a first preset humidity, the frequency change is determined to be a preset third frequency change, and the opening change is determined to be a preset third opening change; if the outer ring temperature is greater than or equal to a preset temperature and the outer ring relative humidity is lower than a second preset humidity but greater than or equal to a first preset humidity, the frequency change is determined to be a preset fourth frequency change, and the opening change is determined to be a preset fourth opening change.

[0010] As can be seen from the above, under this setting, the system quickly obtains the frequency and opening changes that match the detected outer ring temperature and relative humidity based on the pre-stored data table, and rapidly adjusts the compressor frequency and expansion valve opening. The outdoor heat exchanger can quickly reach the target temperature, and the defrosting process responds quickly. Preferably, at least four sets of changes are formed based on the outer ring temperature and relative humidity, resulting in a higher adjustment speed and a more suitable compressor frequency and expansion valve opening for the current operating conditions.

[0011] A further proposed approach is to decrease the values ​​of the first, second, third, and fourth frequency changes sequentially; and / or, to make the second and third opening changes equal, while decreasing the values ​​of the first, second, and fourth opening changes sequentially.

[0012] A further proposed approach is that the four values ​​of the first frequency change, the second frequency change, the third frequency change, and the fourth frequency change form an arithmetic sequence; and / or, the three values ​​of the first opening change, the second opening change, and the fourth opening change form an arithmetic sequence.

[0013] As can be seen from the above, under this setting, the changing trends of frequency change and opening change among multiple variable groups conform to the defrosting heat requirements under the corresponding temperature and humidity changes, ensuring the defrosting effect after adjustment.

[0014] Another further solution is to adjust the compressor frequency upwards based on the frequency change and the expansion valve opening downwards based on the opening change, then monitor the outer pipe temperature in real time. If the outer pipe temperature is greater than the preset pipe temperature, control the system to exit defrost mode.

[0015] As can be seen from the above, after adjusting the operation, if it is determined that the current outer pipe temperature is higher than the preset pipe temperature for non-frost, the defrosting mode can be exited and the system can be switched back to heating mode as soon as possible to provide indoor heating.

[0016] Another further solution is that when the defrosting mode runs for a preset duration, after obtaining the outer ring temperature, outer ring relative humidity, and outer pipe temperature, if the outer pipe temperature is greater than the preset pipe temperature or the outer ring relative humidity is less than the first preset humidity, the defrosting mode is exited.

[0017] As can be seen from the above, in addition to the case where the outer pipe temperature is already higher than the preset pipe temperature for no frost, if the relative humidity of the outer ring is lower than a certain level, it also means that there will be no frost problem on the outdoor heat exchanger pipe. At this time, the defrosting mode should be exited and the heating mode should be returned to operation as soon as possible to provide indoor heating.

[0018] Another further option is to preset the pipe temperature to be greater than or equal to 2 degrees Celsius.

[0019] As can be seen from the above, lower temperatures require higher frequencies and higher exhaust volumes to provide sufficient heat for defrosting. If, at the end of defrosting, the outer pipe temperature is near 0°C and frost has not completely melted, this invention considers a detection delay, and the preset pipe temperature used as the judgment standard needs to be raised. Therefore, a preset pipe temperature greater than or equal to 2°C ensures complete defrosting.

[0020] The second objective of this invention is to provide an air conditioner that includes a processor, which executes a computer program stored in a memory to implement the above-described air conditioning control method.

[0021] The third objective of this invention is to provide a readable storage medium on which a computer program is stored, which, when executed by a processor, implements the air conditioning control method described above. Attached Figure Description

[0022] Figure 1 This is a flowchart of an embodiment of the air conditioning defrosting control method of the present invention.

[0023] Figure 2 This is the first data table of an embodiment of the air conditioning defrosting control method of the present invention.

[0024] Figure 3 This is the second data table of an embodiment of the air conditioning defrosting control method of the present invention.

[0025] Figure 4 This is the first part of the third data table in an embodiment of the air conditioning defrosting control method of the present invention.

[0026] Figure 5 This is the second part of the third data table in an embodiment of the air conditioning defrosting control method of the present invention.

[0027] Figure 6 This is the fourth data table in an embodiment of the air conditioning defrosting control method of the present invention. Detailed Implementation

[0028] Air Conditioner Defrosting Control Methods See Figure 1 The air conditioning defrosting control method in this embodiment includes: The system first executes step S1, and enters the heating mode and runs according to the user's control command.

[0029] If the heating mode runs for a certain period of time, step S2 is executed to repeatedly check whether the conditions for entering the defrost mode are met.

[0030] If the conditions are met, the judgment result of step S2 is yes, and then step S3 is executed to enter defrost mode and run. In this embodiment, the air conditioner operates in defrost mode to cool the air conditioner so that the outdoor heat exchanger heats up.

[0031] The system then executes step S4 to detect the duration and repeatedly checks whether the system has reached the preset duration in defrosting mode.

[0032] If the preset time is reached, the judgment result of step S4 is yes. At this time, step S5 is executed to detect and obtain the outer ring temperature Y, the outer ring relative humidity R, and the outer pipe temperature T. The outer pipe temperature T refers to the pipe temperature of the outdoor heat exchanger of the air conditioner.

[0033] Then, step S6 is executed to determine whether the first or second judgment condition is met. The first judgment condition is that the outer pipe temperature T is greater than the preset pipe temperature R0, and the second judgment condition is that the outer ring relative humidity R is less than the first preset humidity S1. In this embodiment, the preset pipe temperature R0 = 2℃, and the first preset humidity S1 is 40%.

[0034] If the determination step of step S6 is yes, that is, the current outer pipe temperature T > 2℃ or the outer ring relative humidity R < 40%, it means that there is no frost on the outdoor heat exchanger when either of these two conditions is met. At this time, the system executes step S9 to control the exit from defrosting mode and executes step S1 to return to heating mode.

[0035] If the judgment step S6 is negative, it means that the current outer pipe temperature T is less than or equal to the preset pipe temperature R0, and the outer ring relative humidity R is greater than or equal to the first preset humidity S1, that is, the current outer pipe temperature T≤2℃, and the outer ring relative humidity R≥40%.

[0036] At this point, the system executes step S7, which determines the frequency change and opening change based on the outer ring temperature Y and the outer ring relative humidity R.

[0037] In step S7, further, the frequency change is determined based on the numerical range of the outer ring temperature Y and the numerical range of the outer ring relative humidity, and the opening change is determined based on the numerical range of the outer ring temperature and the numerical range of the outer ring relative humidity; further still: If condition one is met: the outer ring temperature Y is less than the preset temperature E0 and the outer ring relative humidity R is greater than or equal to the second preset humidity S2 (Y < E0, R ≥ S2), then the frequency change is determined as the preset first frequency change and the opening change is determined as the preset first opening change.

[0038] If condition 2 is met: the outer ring temperature Y is greater than or equal to the preset temperature E0 and the outer ring relative humidity R is greater than or equal to the second preset humidity S2 (Y≥E0, R≥S2), the frequency change is determined to be the preset second frequency change, and the opening change is determined to be the preset second opening change. If condition 3 is met: if the outer ring temperature Y is less than the preset temperature E0 and the outer ring relative humidity R is less than the second preset humidity S2 and greater than or equal to the first preset humidity S1 (Y < E0, S1 ≤ R < S2), the frequency change is determined to be the preset third frequency change, and the opening change is determined to be the preset third opening change. If condition four is met: if the outer ring temperature Y is greater than or equal to the preset temperature E0 and the outer ring relative humidity R is less than the second preset humidity S2 and greater than or equal to the first preset humidity S1 (Y≥E0, S1≤R<S2), the frequency change is determined as the preset fourth frequency change, and the opening change is determined as the preset fourth opening change.

[0039] In this embodiment, the preset temperature E0 is -2℃, the first preset humidity S1 is 40%, and the second preset humidity S2 is 70%.

[0040] In this embodiment, the first frequency change is 20Hz, the second frequency change is 15Hz, the third frequency change is 10Hz, and the fourth frequency change is 5Hz. The four frequency changes conform to the following: the values ​​of the first frequency change, the second frequency change, the third frequency change, and the fourth frequency change decrease sequentially, and the values ​​of the first frequency change, the second frequency change, the third frequency change, and the fourth frequency change form an arithmetic sequence. In this embodiment, the first opening change is 30B, the second opening change is 20B, the third opening change is 20B, and the fourth opening change is 10B. The four opening changes conform to the following: the second and third opening changes are equal, and the first, second, and fourth opening changes decrease sequentially. Furthermore, the first, second, and fourth opening changes form an arithmetic sequence. The aforementioned opening changes represent the number of opening steps of the expansion valve. In this embodiment, under defrosting mode, the basic number of opening steps for the expansion valve is 180B, and the total number of opening steps is 360B.

[0041] Then, step S8 is executed, which adjusts the compressor frequency upward based on the frequency change and adjusts the expansion valve opening downward based on the opening change. The compressor frequency is adjusted upward by adding the original compressor frequency to the frequency change; the expansion valve opening is adjusted downward by subtracting the opening change from the original opening of the expansion valve.

[0042] The system then continues to operate in defrost mode and continues to execute judgment step S6 to determine whether the outer pipe temperature T > 2℃ or the outer ring relative humidity R < 40%. If the judgment result of the device in judgment step S6 is otherwise, step S9 is executed to exit defrost mode.

[0043] See Figure 2 The first data table shown contains data related to operation in defrost mode when the outer pipe temperature T > 2℃. The data shows that when the outer pipe temperature T > 2℃ and the outer ambient relative humidity R < 40%, according to steps S6 and S9, no frost will form, therefore the compressor frequency and expansion valve opening will not be adjusted, and the defrost mode will exit.

[0044] See Figure 3The second data table shown contains relevant data for operation in defrost mode when the outer ring temperature is -5℃ < T ≤ 2℃. The data shows that since the outer ring temperature Y ≥ -2℃ and the outer ring relative humidity 40% ≤ R < 70% meets condition four above, according to steps S6 to S8, the fourth frequency change is determined to be 5Hz and the fourth opening change is 10B.

[0045] See Figure 4 as well as Figure 5 The third data table shown contains data related to the defrosting mode operation when the outer ring temperature is -10℃ < T ≤ -5℃. The data shows that multiple sets of data have an outer ring temperature Y ≥ -2℃ and an outer ring relative humidity R ≥ 70%, meeting condition two above. Based on steps S6 to S8, the second frequency change is determined to be 15Hz and the second opening change to be 20B. Additionally, multiple sets of data have an outer ring temperature Y < -2℃ and an outer ring relative humidity 40% ≤ R < 70%, meeting condition three above. Based on steps S6 to S8, the third frequency change is determined to be 10Hz and the third opening change to be 20B. See Figure 6 The fourth data table shown contains relevant data for operation in defrost mode when the outer ring temperature T ≤ -10℃. The data shows that, since the outer ring temperature Y < -2℃ and the outer ring relative humidity R ≥ 70% meets the above condition one, according to steps S6 to S8, the first frequency change is determined to be 20Hz and the first opening change to be 30B.

[0046] The frosting of the outdoor unit is related to the outer ring temperature and relative humidity. The higher the relative humidity or the lower the temperature, the thicker the frost will be during defrosting. After defrosting, the lower the outer pipe temperature, the more difficult it is to defrost completely. At the end of defrosting, if the outer pipe temperature is below -10℃, there will be a serious problem of incomplete defrosting. If the pipe temperature is between -10℃ and -5℃, there will be a moderate problem of incomplete defrosting. If the outer pipe temperature is between -5℃ and 2℃, there will be a slight problem of incomplete defrosting. However, if the outer pipe temperature is above 2℃, defrosting can be completed. Therefore, this invention adjusts the compressor frequency and the opening of the expansion valve to change the outer pipe temperature to above 2℃ to ensure complete defrosting.

[0047] In addition, the present invention mainly determines a more accurate adjustment amount based on the current operating conditions (outer ring temperature and outer ring relative humidity). After determining whether defrosting needs to continue based on the outer pipe temperature and outer ring relative humidity, if defrosting needs to continue, the frequency change and opening change are further determined based on environmental parameters closely related to the current operating conditions, such as the outer pipe temperature, outer ring temperature, and outer ring relative humidity. Thus, the compressor operating frequency and expansion valve opening that are more matched to the current operating conditions can be calculated, which can quickly and effectively complete defrosting.

[0048] Air Conditioner Example The air conditioner of the present invention includes 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 all steps of the air conditioner defrosting control method of the present invention.

[0049] The processor referred to 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.

[0050] The memory mainly includes 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 function, image playback function, etc.). The data storage area can store data created based on the use of the handheld terminal (such as audio data, phonebook, etc.). In addition, the memory can include high-speed random access memory, and can also include non-volatile memory, such as hard disk, memory, plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, at least one disk storage device, flash memory device, or other volatile solid-state storage device.

[0051] Readable storage medium embodiments The 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 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-mentioned air conditioning defrosting control method can be implemented.

[0052] The computer program includes computer program code, which may be in the form of source code, object code, executable file, or certain intermediate forms. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording media, USB flash drive, portable hard drive, magnetic disk, optical disk, 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 the computer-readable medium may be appropriately added to or subtracted according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media may not include electrical carrier signals and telecommunication signals.

[0053] Finally, it should be emphasized that the above description is only a preferred embodiment of the present invention and is 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. Air conditioning defrosting control methods, including: Control the air conditioner to operate in defrost mode; Its features are: When the defrosting mode runs for a preset duration, the outer ring temperature, outer ring relative humidity, and outer pipe temperature are obtained. If the outer pipe temperature is less than or equal to the preset pipe temperature and the outer ring relative humidity is greater than or equal to the first preset humidity, the frequency change of the compressor and the opening change of the expansion valve are determined according to the outer ring temperature and the outer ring relative humidity. The compressor frequency is increased according to the frequency change, and the expansion valve opening is decreased according to the opening change. In the step of determining the frequency change and the opening change based on the outer ring temperature and the outer ring relative humidity: The frequency change is determined based on the numerical range of the outer ring temperature and the numerical range of the outer ring relative humidity; the opening change is determined based on the numerical range of the outer ring temperature and the numerical range of the outer ring relative humidity. If the outer ring temperature is less than a preset temperature and the outer ring relative humidity is greater than or equal to a second preset humidity, the frequency change is determined to be a preset first frequency change, and the opening change is determined to be a preset first opening change. If the outer ring temperature is greater than or equal to the preset temperature and the outer ring relative humidity is greater than or equal to the second preset humidity, the frequency change is determined to be the preset second frequency change, and the opening change is determined to be the preset second opening change. If the outer ring temperature is less than the preset temperature and the outer ring relative humidity is less than the second preset humidity but greater than or equal to the first preset humidity, the frequency change is determined to be a preset third frequency change, and the opening change is determined to be a preset third opening change. If the outer ring temperature is greater than or equal to the preset temperature and the outer ring relative humidity is less than the second preset humidity but greater than or equal to the first preset humidity, the frequency change is determined to be a preset fourth frequency change, and the opening change is determined to be a preset fourth opening change.

2. The air conditioning defrosting control method according to claim 1, characterized in that: The four values ​​of the first frequency change, the second frequency change, the third frequency change, and the fourth frequency change decrease sequentially; And / or, The second opening change is equal to the third opening change, and the three values ​​of the first opening change, the second opening change, and the fourth opening change decrease sequentially.

3. The air conditioning defrosting control method according to claim 2, characterized in that: The four values ​​of the first frequency change, the second frequency change, the third frequency change, and the fourth frequency change form an arithmetic sequence; And / or, The first change in opening degree, the second change in opening degree, and the fourth change in opening degree form an arithmetic sequence.

4. The air conditioning defrosting control method according to any one of claims 1 to 3, characterized in that: After the steps of increasing the compressor frequency based on the frequency change and decreasing the expansion valve opening based on the opening change: The temperature of the outer tube is monitored in real time. If the temperature of the outer tube is greater than the preset temperature, the defrosting mode is exited.

5. The air conditioning defrosting control method according to any one of claims 1 to 3, characterized in that: After the defrosting mode has run for the preset duration, and after obtaining the outer ring temperature, outer ring relative humidity, and outer pipe temperature: If the outer pipe temperature is greater than the preset pipe temperature or the outer ring relative humidity is less than the first preset humidity, the defrosting mode is exited.

6. The air conditioning defrosting control method according to any one of claims 1 to 3, characterized in that: The preset tube temperature is greater than or equal to 2 degrees Celsius.

7. An air conditioner, characterized in that: The device includes a processor for executing a computer program stored in a memory to implement the air conditioning defrosting control method as described in any one of claims 1 to 6.

8. A readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, it implements the air conditioning defrosting control method as described in any one of claims 1 to 6.

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