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

Abstract

The invention provides an air conditioner defrosting control method, an air conditioner and a readable storage medium. The air conditioner defrosting control method comprises the steps that an air conditioner is controlled to operate in a defrosting mode; when the operation duration of the defrosting mode reaches the preset duration, the outer ring temperature, the outer ring relative humidity and the outer side pipe temperature are obtained; if the outer side pipe temperature is smaller than or equal to the preset pipe temperature and the outer ring relative humidity is larger than or equal to the first preset humidity, the frequency variation and the opening degree variation are determined according to the outer ring temperature and the outer ring relative humidity; and the frequency of the compressor is increased according to the frequency variation, and the opening degree of the expansion valve is decreased according to the opening degree variation. According to the control method, the frequency variable quantity and the opening variable quantity are determined according to environmental parameters such as the outer side pipe temperature, the outer ring temperature and the outer ring relative humidity which are closely related to the current working condition, defrosting is rapidly and effectively completed, and it is guaranteed that defrosting is thorough and free of residues.

Description

Technical Field

[0001] The present invention relates to the technical field of air-conditioning control, and in particular to an air-conditioning defrosting control method, an air conditioner and a readable storage medium. Background Art

[0002] In an existing air conditioner defrost control method, before entering defrost mode, the current outdoor relative humidity is obtained, and the defrost time is determined based on the relative humidity range. If the real-time defrost time exceeds the standard defrost time for the corresponding range and the outdoor pipe temperature is not higher than a preset value, the defrost is extended for a first preset duration and the compressor frequency is increased at a preset frequency increase rate. If the outdoor pipe temperature is still not higher than the preset value after the first defrost extension, the defrost is further extended and the expansion valve opening is reduced at a preset rate. When the outdoor pipe temperature is higher than the preset value, the defrost is terminated.

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

[0004] The first object of the present invention is to provide an air conditioner defrost control method that improves defrost efficiency and effect, thereby enhancing user experience.

[0005] A second object of the present invention is to provide an air conditioner capable of implementing the above-mentioned air conditioning control method.

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

[0007] The air conditioner defrost control method provided by the first purpose of the present invention includes: controlling the air conditioner to operate in defrost mode; when the running time of the defrost mode reaches a preset time, obtaining the outer ring temperature, outer ring relative humidity and outer pipe temperature; 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, determining the frequency change of the compressor and the opening change of the expansion valve according to the outer ring temperature and the outer ring relative humidity; increasing the frequency of the compressor according to the frequency change, and decreasing the opening of the expansion valve according to the opening change.

[0008] It can be seen from the above scheme that the present invention mainly determines a more accurate adjustment amount according to the current working conditions, and judges whether it is necessary to continue the defrosting process according to the outer tube temperature and the outer ring relative humidity. If it is necessary to continue the defrosting, the frequency change and the opening change are further determined according to the environmental parameters closely related to the current working conditions, such as the outer tube temperature, the outer ring temperature and the outer ring relative humidity. The compressor operating frequency and the expansion valve opening that are more matched with the current working conditions can be calculated, and the defrosting can be completed quickly and effectively. Furthermore, the present invention also takes into account the problem that the outer ring temperature and the outer ring relative humidity may not guide the paper for defrosting cleanly. Therefore, the outer ring temperature and the outer ring relative humidity are used as the main basis when calculating the compressor operating frequency and the expansion valve opening, so as to ensure that the defrosting is thorough and there is no residue, and to ensure the heating efficiency of the next heating operation, so as to bring a better user experience both in the defrosting stage and the heating stage. A further solution is that in the step of determining the frequency change and the opening change according to the outer ring temperature and the outer ring relative humidity: the frequency change and the opening change are determined according to the numerical interval of the outer ring temperature and the numerical interval of the outer ring relative humidity.

[0009] A further solution is that in the step of determining the frequency change and the opening change according to the numerical range of the outer ring temperature and the numerical range of the outer ring relative humidity: if the outer ring temperature is lower than 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 first frequency change, and the opening change is determined to be the 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 lower than the preset temperature and the outer ring relative humidity is less than the second preset humidity and greater than or equal to the first preset humidity, 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 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 and greater than or equal to the first preset humidity, the frequency change is determined to be the preset fourth frequency change, and the opening change is determined to be the preset fourth opening change.

[0010] As can be seen above, with this setup, the system quickly retrieves the frequency and opening changes that match the detected external heat exchanger temperature and relative humidity from a pre-stored data table and rapidly adjusts the compressor frequency and expansion valve opening. This allows the outdoor heat exchanger to quickly reach the target temperature, ensuring a rapid defrost response. Preferably, at least four groups of changes are formed based on the external heat exchanger temperature and relative humidity, enabling faster adjustment and better adaptation of the compressor frequency and expansion valve opening to the current operating conditions.

[0011] A further solution is that the four values ​​of the first frequency change, the second frequency change, the third frequency change and the fourth frequency change decrease in sequence; 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 in sequence.

[0012] A further solution 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 progression; and / or the three values ​​of the first opening change, the second opening change and the fourth opening change form an arithmetic progression.

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

[0014] Another further solution is to increase the frequency of the compressor according to the frequency change and decrease the opening of the expansion valve according to the opening change: detect the outside pipe temperature in real time, and if the outside pipe temperature is greater than the preset pipe temperature, control the exit of the defrost mode.

[0015] As can be seen from the above, after the adjustment operation, if it is determined that the current outer pipe temperature is higher than the preset pipe temperature without frost, the defrost mode can be controlled to exit and the heating mode can be returned to as soon as possible to provide indoor heating.

[0016] Another further solution is that when the defrost mode operation time reaches the preset time, after the steps of 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 control exits the defrost mode.

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

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

[0019] As can be seen above, lower temperatures require higher frequency and higher exhaust to provide sufficient heat for defrosting. If the outer tube temperature is near 0°C at the end of defrosting, and frost has not yet completely melted, the present invention takes into account detection delays and increases the preset tube temperature used as a judgment standard. Therefore, a preset tube temperature greater than or equal to 2°C ensures clean defrosting.

[0020] The air conditioner provided by the second object of the present invention includes a processor, which is used to implement the above-mentioned air conditioning control method when executing the computer program stored in the memory.

[0021] The third object of the present invention is to provide a readable storage medium having a computer program stored thereon, which implements the above-mentioned air conditioning control method when the computer program is executed by a processor. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a flow chart of an embodiment of the air conditioner defrost control method of the present invention.

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

[0024] Figure 3 This is the second data table of the embodiment of the air conditioner defrost control method of the present invention.

[0025] Figure 4 This is the first part of the third data table of the embodiment of the air conditioner defrost control method of the present invention.

[0026] Figure 5 This is the second part of the third data table of the embodiment of the air conditioner defrost control method of the present invention.

[0027] Figure 6 This is the fourth data table of the embodiment of the air conditioner defrost control method of the present invention. DETAILED DESCRIPTION

[0028] Air conditioner defrost control method See also Figure 1 The air conditioner defrost control method of this embodiment includes: The system first executes step S1, enters the heating mode and operates according to the user's control instructions.

[0029] When the heating mode is operated for a certain period of time, step S2 is executed to cyclically determine whether the conditions for entering the defrost mode are met.

[0030] If the condition is satisfied, the result of step S2 is yes, and then step S3 is executed to enter the defrost mode and operate. In this embodiment, in the defrost mode, the air conditioner operates in a cooling mode to generate heat in the outdoor heat exchanger.

[0031] The system then executes step S4 to detect the duration, and cyclically determines whether the operation in the defrost mode reaches the preset duration.

[0032] If the preset time is reached, the judgment result of step S4 is yes, and step S5 is executed to detect and obtain the outer ring temperature Y, outer ring relative humidity R and 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 tube temperature T is greater than the preset tube 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 tube temperature R0 is 2°C, and the first preset humidity S1 is 40%.

[0034] If the judgment step of step S6 is yes, that is, the current outer pipe temperature T is greater than 2°C or the outer ring relative humidity R is less than 40%, when either of these two conditions is met, it means that there is no frost on the current outdoor heat exchanger. At this time, the system executes step S9, controls the exit of the defrost mode, and executes step S1 to return to the heating mode.

[0035] If the judgment step of step S6 is no, 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°C, and the outer ring relative humidity R≥40%.

[0036] At this time, the system executes step S7 to determine the frequency change and the opening change according to the outer ring temperature Y and the outer ring relative humidity R.

[0037] In step S7, further, the frequency change is determined according to the numerical interval of the outer ring temperature Y and the numerical interval of the outer ring relative humidity, and the opening change is determined according to the numerical interval of the outer ring temperature and the numerical interval of the outer ring relative humidity; further: If the first condition 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 to be the preset first frequency change, and the opening change is determined to be the preset first opening change.

[0038] If the second condition 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 the third condition 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 the fourth situation 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 to be the preset fourth frequency change, and the opening change is determined to be the preset fourth opening change.

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

[0040] In this embodiment, the first frequency change is 20 Hz, the second frequency change is 15 Hz, the third frequency change is 10 Hz, and the fourth frequency change is 5 Hz. The four frequency changes meet the following conditions: the first frequency change, the second frequency change, the third frequency change, and the fourth frequency change decrease in sequence, and meet the following conditions: the first frequency change, the second frequency change, the third frequency change, and the fourth frequency change form an arithmetic progression. 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 change values ​​meet the following conditions: the second opening change is equal to the third opening change, and the values ​​of the first, second, and fourth opening changes decrease in sequence. Furthermore, the values ​​of the first, second, and fourth opening changes form an arithmetic progression. The above-mentioned opening change is the number of opening steps of the expansion valve. In this embodiment, in defrost mode, the basic opening step number of the expansion valve is 180B, and the total opening step number of the expansion valve is 360B.

[0041] Then, step S8 is executed to increase the frequency of the compressor according to the frequency change, and decrease the opening of the expansion valve according to the opening change. The frequency of the compressor is increased by the original frequency of the compressor + the frequency change; the opening of the expansion valve is decreased by the original opening of the expansion valve - the opening change.

[0042] The system then continues to operate in defrost mode and continues to execute step S6 to determine whether the outer tube temperature T>2°C or the outer ring relative humidity R<40%. If the result of step S6 is negative, the system executes step S9 to exit defrost mode.

[0043] See also Figure 2 The first data table shown shows data for operation in defrost mode when the outside pipe temperature T is greater than 2°C. The data shows that when the outside pipe temperature T is greater than 2°C and the outer ring relative humidity R is less than 40%, no frost will form according to the execution of steps S6 and S9. Therefore, the compressor frequency and expansion valve opening are not adjusted, and the defrost mode is exited.

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

[0045] See also Figure 4 as well as Figure 5 The third data table shown is for defrost mode operation with an outer tube temperature of -10°C < T ≤ -5°C. The data shows that multiple sets of data for an outer ring temperature Y ≥ -2°C and an outer ring relative humidity R ≥ 70% meet the second condition described above. Based on the execution of steps S6 to S8, the second frequency change of 15Hz and the second opening change of 20B are determined. Additionally, multiple sets of data for an outer ring temperature Y < -2°C and an outer ring relative humidity of 40% ≤ R < 70% meet the third condition described above. Based on the execution of steps S6 to S8, the third frequency change of 10Hz and the third opening change of 20B are determined. See also Figure 6 The fourth data table shown shows data related to operation in defrost mode with an outer tube temperature T ≤ -10°C. The data shows that since the outer ring temperature Y is less than -2°C and the outer ring relative humidity R is ≥ 70%, which meets the first condition described above, the first frequency change is determined to be 20 Hz and the first opening change is determined to be 30B according to the execution of steps S6 to S8.

[0046] Frosting of the outdoor unit is related to the outer ring temperature and the outer ring relative humidity. The greater the outer ring relative humidity or the lower the temperature, the thicker the frost will be during defrosting. The lower the outer pipe temperature after defrosting, the more difficult it will be to defrost thoroughly. At the end of defrosting, if the outer pipe temperature is lower than -10℃, serious incomplete defrosting will occur. If the pipe temperature is -10 to -5℃, moderate incomplete defrosting will occur. If the outer pipe temperature is between -5℃ and 2℃, mild incomplete defrosting will occur. If the outer pipe temperature is greater than 2℃, complete defrosting can be achieved. To this end, the present invention adjusts the compressor frequency and the expansion valve opening to change the outer pipe temperature to greater than 2℃ to ensure complete defrosting.

[0047] In addition, the present invention mainly determines a more accurate adjustment amount based on the current working conditions (outer ring temperature and outer ring relative humidity), and judges whether to continue defrosting based on the outer pipe temperature and outer ring relative humidity. If defrosting is required, the frequency change amount and the opening change amount are further determined based on environmental parameters closely related to the current working conditions, such as the outer pipe temperature, outer ring temperature and outer ring relative humidity. The compressor operating frequency and expansion valve opening that are more compatible with the current working conditions can be calculated, and defrosting can be completed quickly and effectively.

[0048] Air Conditioner Embodiment The air conditioner of the present invention includes a processor and a memory, such as a single chip microcomputer including a central processing unit. In addition, the processor is used to implement all steps of the air conditioner defrost control method of the present invention when executing a computer program stored in the memory.

[0049] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0050] The memory primarily includes a program storage area and a data storage area. The program storage area can store an operating system and at least one application required for a function (such as sound playback or image playback); the data storage area can store data generated based on the use of the handheld terminal (such as audio data and a phone book). Furthermore, the memory can include high-speed random access memory (RAM) and non-volatile memory, such as a hard disk, internal memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) card, a Flash Card, at least one disk storage device, a flash memory device, or other volatile solid-state storage device.

[0051] Readable storage medium embodiment 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 defrost control method can be implemented.

[0052] The computer program includes computer program code, which may be in source code form, object code form, executable file, or some intermediate form. The computer-readable medium may include any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard drive, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal, and software distribution medium. It should be noted that the content of the computer-readable medium may be appropriately increased or decreased based on the requirements of legislation and patent practice within a jurisdiction. For example, in some jurisdictions, based on legislation and patent practice, computer-readable media does not include electric carrier signals and telecommunication signals.

[0053] Finally, it should be emphasized that the above 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 may have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. Air conditioner defrost control method, including: Control the air conditioner to operate in defrost mode; Its characteristics are: When the defrost mode operation time reaches the preset time, 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 a preset pipe temperature and the outer ring relative humidity is greater than or equal to a first preset humidity, determining a frequency change of the compressor and an opening change of the expansion valve according to the outer ring temperature and the outer ring relative humidity; The frequency of the compressor is increased according to the frequency change, and the opening of the expansion valve is decreased according to the opening change.

2. The air conditioner defrost control method according to claim 1, characterized in that: In the step of determining the frequency change and the opening change according to the outer ring temperature and the outer ring relative humidity: The frequency change is determined according to the numerical interval of the outer ring temperature and the numerical interval of the outer ring relative humidity, and the opening change is determined according to the numerical interval of the outer ring temperature and the numerical interval of the outer ring relative humidity.

3. The air conditioner defrost control method according to claim 2, characterized in that: In the steps of determining the frequency change according to the numerical interval of the outer ring temperature and the numerical interval of the outer ring relative humidity, and determining the opening change according to the numerical interval of the outer ring temperature and the numerical interval of the outer ring relative humidity: If the outer ring temperature is lower than 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 first frequency change, and the opening change is determined to be the 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 lower than the preset temperature and the outer ring relative humidity is lower than the second preset humidity and 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 and greater than or equal to the first preset humidity, the frequency change is determined to be the preset fourth frequency change, and the opening change is determined to be the preset fourth opening change.

4. The air conditioner defrost control method according to claim 3, 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 in sequence; and / or, The second opening change is equal to the third opening change, and the first opening change, the second opening change and the fourth opening change decrease in sequence.

5. The air conditioner defrost control method according to claim 4, 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 progression; and / or, The three values ​​of the first opening change amount, the second opening change amount and the fourth opening change amount form an arithmetic progression.

6. The air conditioner defrost control method according to any one of claims 1 to 5, characterized in that: After the steps of increasing the frequency of the compressor according to the frequency variation and decreasing the opening of the expansion valve according to the opening variation: The outside pipe temperature is detected in real time, and if the outside pipe temperature is greater than the preset pipe temperature, the defrost mode is controlled to be exited.

7. The air conditioner defrost control method according to any one of claims 1 to 5, characterized in that: When the defrost mode operation time reaches the preset time, 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 control exits the defrost mode.

8. The air conditioner defrost control method according to any one of claims 1 to 5, characterized in that: The preset tube temperature is greater than or equal to 2 degrees Celsius.

9. An air conditioner, characterized in that: The system comprises a processor, wherein the processor is configured to implement the air conditioner defrost control method according to any one of claims 1 to 8 when executing a computer program stored in a memory.

10. A readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the air conditioner defrost control method according to any one of claims 1 to 8 is implemented.

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