Control method of air conditioner, air conditioner, and storage medium

Abstract

The application discloses a control method of an air conditioner, the air conditioner and a storage medium, and relates to the technical field of air conditioners. The method comprises the following steps: controlling the air conditioner to operate in a heating mode; controlling the air conditioner to operate in a defrosting mode when the air conditioner meets a defrosting starting condition, and controlling a compressor of the air conditioner to reduce the frequency to a first defrosting frequency; and controlling the compressor to increase the frequency to a second defrosting frequency when the compressor operates to meet a first condition. The first defrosting frequency is less than the second defrosting frequency, and an indoor heat exchanger is in a heating state during the defrosting operation of the air conditioner. The application aims to improve the defrosting effect and reduce indoor temperature fluctuations.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and in particular to control methods for air conditioners, air conditioners, and storage media. Background Technology

[0002] When an air conditioner is in heating mode in low temperatures, the outdoor unit is prone to frost buildup. The air conditioner needs to defrost to maintain its heating performance. During the defrosting process in the thin frost quick-melt mode, the indoor heat exchanger continues to transfer heat to the room.

[0003] Currently, in the thin frost quick defrost mode, the air conditioner compressor generally maintains low frequency operation after frequency reduction. This will result in insufficient indoor heating and defrosting heat after a certain defrosting time, which will not be able to guarantee the outdoor defrosting effect and will cause large fluctuations in indoor temperature. Summary of the Invention

[0004] The main objective of this application is to provide a control method for an air conditioner, an air conditioner, and a storage medium, which aims to improve the defrosting effect while reducing indoor temperature fluctuations.

[0005] To achieve the above objectives, this application proposes a control method for an air conditioner, the method comprising:

[0006] Control the air conditioner to operate in heating mode;

[0007] When the air conditioner meets the defrosting start conditions, the air conditioner is controlled to defrost, and the compressor of the air conditioner is controlled to reduce its frequency to the first defrosting frequency.

[0008] When the compressor operates to the point where the first condition is met, the compressor is controlled to increase its frequency to the second defrosting frequency.

[0009] Wherein, the first defrosting frequency is less than the second defrosting frequency, and the indoor heat exchanger is in heating mode during the defrosting operation of the air conditioner.

[0010] In one embodiment, the air conditioner includes an indoor heat exchanger, a throttling device, and an outdoor heat exchanger connected in sequence, and the step of controlling the defrosting operation of the air conditioner includes:

[0011] Control the throttling device to increase its opening to the first defrosting opening.

[0012] In one embodiment, after controlling the throttling device to increase its opening to a first defrosting opening and controlling the air conditioner's compressor to reduce its frequency to a first defrosting frequency, the method further includes:

[0013] When the compressor runs to meet the first condition, the compressor is controlled to increase its frequency to the second defrosting frequency.

[0014] When the air conditioner operates to meet the second condition, the throttling device is controlled to increase its opening to the second defrosting opening.

[0015] The second defrost opening is greater than the first defrost opening.

[0016] In one embodiment, after the step of controlling the compressor of the air conditioner to reduce its frequency to a first defrost frequency and before the step of controlling the compressor to increase its frequency to a second defrost frequency when the compressor operates to meet a first condition, the method further includes:

[0017] When the air conditioner meets the defrost start conditions, the indoor fan corresponding to the indoor heat exchanger is controlled to reduce to the defrost speed.

[0018] In one embodiment, before the step of controlling the compressor to increase its frequency to a second defrost frequency when the compressor operates to meet the first condition, the method further includes:

[0019] When the air conditioner meets the defrosting start conditions, the throttling device is controlled to maintain the heating opening, the compressor is controlled to reduce its frequency to the transition frequency, and the indoor fan is controlled to reduce its speed to the first speed.

[0020] When the preset defrosting mode start conditions are met, the indoor fan is controlled to decrease to the defrosting speed, the throttling device is controlled to increase its opening to the first defrosting opening, and the air conditioner compressor is controlled to decrease its frequency to the first defrosting frequency.

[0021] Wherein, the transition frequency is greater than the first defrosting frequency and the second defrosting frequency, the first rotation speed is greater than the defrosting rotation speed, and the heating opening degree is less than the defrosting opening degree.

[0022] In one embodiment, the steps of controlling the compressor to operate at a reduced frequency to a transition frequency and controlling the indoor fan to reduce its speed to a first speed include:

[0023] The compressor is controlled to operate at a reduced frequency to a transition frequency, and the indoor fan is controlled to operate at a reduced speed to the second speed.

[0024] When the third condition is met, the indoor fan is controlled to reduce to the first speed.

[0025] The second rotational speed is greater than the first rotational speed.

[0026] In one embodiment, after the step of controlling the air conditioner to operate in heating mode, the method further includes:

[0027] When the air conditioner meets the defrost start conditions, the outdoor fan corresponding to the outdoor heat exchanger is controlled to maintain the current speed.

[0028] During the defrosting operation of the air conditioner, when the temperature difference between the outdoor heat exchanger and the outdoor ambient temperature is greater than or equal to a preset temperature difference, the outdoor fan is controlled to stop.

[0029] In one embodiment, after the step of controlling the compressor to increase its frequency to a second defrosting frequency when the compressor operates to meet the first condition, the method further includes:

[0030] When the air conditioner meets the defrosting end conditions, the compressor is controlled to increase its frequency to the heating frequency, and the throttling device is controlled to reduce its opening to the heating opening.

[0031] In one embodiment, the steps of controlling the compressor to operate at a higher frequency to the heating frequency and controlling the throttling device to reduce its opening to the heating opening include:

[0032] The compressor is controlled to gradually increase its frequency to the heating frequency, and the throttling device is controlled to gradually decrease its opening to the heating opening.

[0033] In addition, to achieve the above objectives, this application also proposes an air conditioner, the air conditioner comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the control method for the air conditioner as described above.

[0034] In addition, to achieve the above objectives, this application also proposes a storage medium, which is a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, it implements the steps of the air conditioner control method described above.

[0035] One or more technical solutions proposed in this application have at least the following technical effects: In the defrosting operation of the air conditioner, the compressor no longer operates at a fixed low frequency after frequency reduction, but instead reduces the frequency first and then increases it. The frequency increase in the later stage of defrosting is conducive to improving the compression ratio and exhaust temperature of the compressor, thereby increasing the temperature of the indoor heat exchanger and the outdoor heat exchanger, increasing the heat transfer temperature difference between the refrigerant and the frost layer, and improving the defrosting effect while reducing indoor temperature fluctuations. Attached Figure Description

[0036] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0037] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the system structure of an embodiment of the air conditioner of this application;

[0039] Figure 2 This is a schematic diagram of the equipment structure of the hardware operating environment involved in the control method of the air conditioner in this application embodiment;

[0040] Figure 3 This is a flowchart illustrating an embodiment of the control method for an air conditioner according to this application.

[0041] Figure 4 This is a flowchart illustrating Embodiment 2 of the control method for the air conditioner of this application;

[0042] Figure 5 This is a flowchart illustrating Embodiment 3 of the control method for the air conditioner of this application;

[0043] Figure 6 This is a timing control diagram of the various components involved in the control method embodiment of the air conditioner of this application when switching between heating mode and defrosting mode.

[0044] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0045] It should be understood that the specific embodiments described herein are merely illustrative of the technical solutions of this application and are not intended to limit this application.

[0046] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0047] The main solution of this application embodiment is: when the air conditioner meets the defrosting start conditions, control the air conditioner to defrost, control the air conditioner compressor to reduce the frequency to a first defrosting frequency, and control the compressor to increase the frequency to a second defrosting frequency when the first condition is met; wherein, the first defrosting frequency is less than the second defrosting frequency, and the indoor heat exchanger is in heating state during the defrosting operation of the air conditioner.

[0048] In this embodiment, for ease of description, the following description uses an air conditioner as the subject of execution.

[0049] Due to existing technology, in the thin frost quick defrost mode, the air conditioner compressor generally maintains low frequency operation after frequency reduction. This will result in insufficient indoor heating and defrosting heat after a certain defrosting time, which will not be able to guarantee the outdoor defrosting effect and will cause large fluctuations in indoor temperature.

[0050] This application provides the aforementioned solution, in which the compressor no longer operates at a fixed low frequency after frequency reduction during the defrosting process of the air conditioner. Instead, it first reduces the frequency and then increases it. The frequency increase in the later stage of defrosting helps to improve the compressor's compression ratio and exhaust temperature, thereby increasing the indoor and outdoor heat exchanger temperatures, increasing the heat transfer temperature difference between the refrigerant and the frost layer, and improving the defrosting effect while reducing indoor temperature fluctuations. Specifically, the phased speed reduction of the indoor fan, the phased increase in the opening of the throttling device, and the phased frequency reduction of the compressor help to effectively balance indoor heating and defrosting heat, and can effectively reduce indoor noise during defrosting operation.

[0051] This application provides an air conditioner. The air conditioner may include any type of air conditioner such as a wall-mounted air conditioner, a cabinet air conditioner, a window air conditioner, or a ceiling-mounted air conditioner.

[0052] In this embodiment of the invention, reference is made to Figure 1 and Figure 2 The air conditioner includes a control device 100, a compressor 1, a commutator 2, an indoor heat exchanger 7, a throttling device 4, and an outdoor heat exchanger 3. The indoor heat exchanger 7, the throttling device 4, and the outdoor heat exchanger 3 are connected sequentially. The exhaust port and return port of the indoor heat exchanger 7, the outdoor heat exchanger 3, and the compressor 1 are all connected to the commutator 2. An indoor fan 8 is correspondingly installed on the indoor heat exchanger 7, and an outdoor fan 9 is correspondingly installed on the outdoor heat exchanger 3. The compressor 1, the commutator 2, the throttling device 4, the outdoor fan 9, and the indoor fan 8 are all connected to the control device 100.

[0053] The outdoor heat exchanger 3 includes at least two heat exchange sections, which are arranged side by side. In this embodiment, the at least two heat exchange sections are arranged along the airflow direction driven by the outdoor fan 9, and the at least two heat exchange sections are connected in series.

[0054] The reversing assembly 2 may include a four-way valve, etc. The reversing assembly 2 has a first state and a second state to switch between different refrigerant flow directions. When the reversing assembly 2 is running in the first state, the exhaust port of the compressor 1 is connected to the outdoor heat exchanger 3 and the return port of the compressor 1 is connected to the indoor heat exchanger 7. The refrigerant flowing out of the compressor 1 flows sequentially through the outdoor heat exchanger 3, the throttling device 4, and the indoor heat exchanger 7 before returning to the compressor 1. When the reversing assembly 2 is running in the second state, the exhaust port of the compressor 1 is connected to the indoor heat exchanger 7 and the return port of the compressor 1 is connected to the outdoor heat exchanger 3. The refrigerant flowing out of the compressor 1 flows sequentially through the indoor heat exchanger 7, the throttling device 4, and the outdoor heat exchanger 3 before returning to the compressor 1.

[0055] Based on the above settings, the operating modes of an air conditioner include at least the following:

[0056] In heating mode, the reversing component 2 operates in the second state, the throttling device 4 operates at the first opening degree, the compressor 1 operates at the heating frequency, the indoor heat exchanger 7 is in the condensing state, and the outdoor heat exchanger 3 is in the evaporating state.

[0057] In the first defrosting mode, the reversing component 2 operates in the second state, the throttling device 4 operates at the second opening degree, which is greater than the first opening degree, the compressor 1 operates at the first defrosting frequency, the indoor heat exchanger 7 is in the condensation state, and the outdoor heat exchanger 3 releases heat to melt the frost in its space.

[0058] In the second defrosting mode, the reversing assembly 2 operates in the second state, the throttling device 4 operates at the third opening degree, the second opening degree is greater than or equal to the third opening degree, the compressor 1 operates at the second defrosting frequency, the first defrosting frequency is greater than the second defrosting frequency, the indoor heat exchanger 7 is in the condensing state, and the outdoor heat exchanger 3 is in the heat release state, and the space in which it is located is frosted.

[0059] In cooling mode, the reversing assembly 2 operates in the first state, the throttling device 4 operates at the fourth opening degree, the compressor 1 operates at the cooling frequency, the indoor heat exchanger 7 is in the evaporation state, and the outdoor heat exchanger 3 is in the condensation state.

[0060] In the third defrosting mode, the reversing component 2 operates in the first state, the throttling device 4 operates at the fifth opening degree, the compressor 1 operates at the third defrosting frequency, the indoor heat exchanger 7 is in the evaporation state, and the outdoor heat exchanger 3 is in the condensation state, releasing heat to melt the frost in its space.

[0061] In the first defrost mode, the frost thickness is greater than that in the second defrost mode, and in the third defrost mode, the frost thickness is greater than that in the first defrost mode. When the air conditioner switches from heating mode to the first or second defrost mode, the commutator 2 does not need to reverse, and the indoor heat exchanger 7 remains in a heat-releasing state. The opening of the throttling device 4 is increased to raise the temperature of the refrigerant flowing into the outdoor heat exchanger 3, thereby melting the frost on the outdoor heat exchanger 3. This process effectively reduces the noise generated by the commutator 2 during switching and reduces temperature fluctuations in the indoor environment. When the air conditioner switches from heating mode to the third defrost mode, the commutator 2 needs to reverse, the indoor heat exchanger 7 is in an evaporating state, and the outdoor heat exchanger switches to a condensing state. The high-temperature refrigerant discharged from the compressor 1 flows into the outdoor heat exchanger 3 for defrosting.

[0062] In this embodiment, the second opening degree and the third opening degree are the maximum opening degree of the throttling device 4. In other embodiments, the second opening degree and the third opening degree may also be smaller than the maximum opening degree and larger than the first opening degree.

[0063] In this embodiment, refer to Figure 1 The air conditioner also includes a refrigerant heat dissipation assembly 5 and a one-way throttling valve 6. The refrigerant heat dissipation assembly 5 is configured to dissipate heat from the heat-generating components in the air conditioner. The outdoor heat exchanger 3, throttling device 4, refrigerant heat dissipation assembly 5, one-way throttling valve 6, and indoor heat exchanger 7 are connected in sequence. The one-way throttling valve 6 is configured to throttle the refrigerant flow from the refrigerant heat dissipation assembly 5 to the indoor heat exchanger 7, and not throttle the refrigerant flow from the indoor heat exchanger 7 to the refrigerant heat dissipation assembly 5. The throttling device 4 can be an electronic expansion valve.

[0064] In one embodiment, reference is made to Figure 2 The air conditioner also includes a first temperature sensor 01, which is connected to the control device 100. The temperature sensor 01 can be installed on the outdoor heat exchanger 3 to detect its temperature. Specifically, the temperature sensor 01 can be installed at at least one of the following temperatures: the inlet of the outdoor heat exchanger 3, the outlet of the outdoor heat exchanger 3, the middle of the outdoor heat exchanger 3, between different heat exchange sections of the outdoor heat exchanger 3, etc. In this embodiment, the temperature sensor 01 is installed at the inlet of the outdoor heat exchanger 3 to detect the refrigerant temperature at the inlet of the outdoor heat exchanger 3.

[0065] In one embodiment, reference is made to Figure 2 The air conditioner also includes a second temperature sensor 02, which is connected to the control device 100. The second temperature sensor 02 can be located in the indoor heat exchanger 7 to detect its temperature. Specifically, the second temperature sensor 02 can be located at at least one of the following temperatures: the inlet of the indoor heat exchanger 7, the outlet of the indoor heat exchanger 7, the middle of the indoor heat exchanger 7, between different heat exchange sections of the indoor heat exchanger 7, etc. In this embodiment, the second temperature sensor 02 is located at the inlet of the indoor heat exchanger 7 to detect the refrigerant temperature at the inlet of the indoor heat exchanger 7.

[0066] Reference Figure 2 The control device 100 for the air conditioner includes: at least one processor 1001; and a memory 1002 communicatively connected to the at least one processor 1001, and a timer 1003, etc.; wherein the memory 1002 stores instructions that can be executed by the at least one processor 1001, and the instructions are executed by the at least one processor 1001 to enable the at least one processor 1001 to execute the control method of the air conditioner in the first embodiment above.

[0067] The following is for reference. Figure 2The diagram illustrates a structural schematic of a control device 100 suitable for implementing embodiments of this application. The air conditioner in these embodiments may include, but is not limited to, mobile terminals such as mobile phones, laptops, digital radio receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), in-vehicle terminals (e.g., in-vehicle navigation terminals), and fixed terminals such as digital TVs and desktop computers. Figure 2 The control device 100 shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of this application.

[0068] like Figure 2 As shown, the control device 100 may include a processor 1001 (e.g., a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes according to a program stored in memory 1002. The program in memory 1002 may be a program in read-only memory (ROM) or a program loaded from a storage device into random access memory (RAM). The RAM also stores various programs and data required for the operation of the control device 100. The processor 1001 and memory 1002 (ROM and RAM) are interconnected via a bus. Input / output (I / O) interfaces are also connected to the bus. Typically, the following systems can be connected to the I / O interface: input devices including, for example, touchscreens, touchpads, keyboards, mice, image sensors, microphones, accelerometers, gyroscopes, etc.; output devices including, for example, liquid crystal displays (LCDs), speakers, vibrators, etc.; storage devices including, for example, magnetic tapes, hard disks, etc.; and communication devices. The communication device allows the control device 100 to communicate wirelessly or wiredly with other devices to exchange data. Although the control unit 100 with various systems is shown in the figure, it should be understood that it is not required to implement or have all of the systems shown. More or fewer systems may be implemented or have alternatively.

[0069] Specifically, according to the embodiments disclosed in this application, the method flow described in the above embodiments can be implemented as a computer software program. For example, the embodiments disclosed in this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network via a communication device, or installed from memory 1002. When the computer program is executed by processor 1001, it performs the functions defined in the control method of the air conditioner of the embodiments disclosed in this application.

[0070] The air conditioner provided in this application, employing the control method of the air conditioner in the above embodiments, can solve the technical problem of how to ensure defrosting effect while reducing indoor temperature fluctuations. Compared with the prior art, the beneficial effects of the air conditioner provided in this application are the same as those of the control method of the air conditioner provided in the above embodiments, and other technical features of this air conditioner are the same as those disclosed in the method of the previous embodiment, and will not be repeated here.

[0071] It should be noted that the executing entity in this embodiment can be a computing service device with data processing, network communication, and program execution functions, such as a tablet computer, personal computer, or mobile phone, or an electronic device or air conditioner capable of performing the above functions. The following description uses an air conditioner as an example to illustrate this embodiment and the subsequent embodiments.

[0072] Based on this, the embodiments of this application provide a control method for an air conditioner, referring to... Figure 3 , Figure 3 This is a flowchart illustrating the first embodiment of the control method for the air conditioner of this application.

[0073] In this embodiment, the control method of the air conditioner includes steps S10 to S30:

[0074] Step S10: Control the air conditioner to operate in heating mode;

[0075] During the heating operation of the air conditioner, the commutation component operates in the second state, the throttling device operates at the throttling opening, the compressor operates at the heating frequency, and the refrigerant discharged by the compressor flows sequentially through the indoor heat exchanger, the throttling device, and the outdoor heat exchanger before returning to the compressor. The indoor heat exchanger is in the condensing state, and the outdoor heat exchanger is in the evaporating state.

[0076] Step S20: When the air conditioner meets the defrosting start conditions, control the air conditioner to defrost, control the air conditioner compressor to reduce the frequency to the first defrosting frequency, and the indoor heat exchanger is in heating mode during the defrosting operation of the air conditioner.

[0077] The defrosting start conditions include the conditions that the air conditioner's own operating parameters and / or the environmental parameters of the environment in which the air conditioner is located must meet when the outdoor heat exchanger needs to be defrosted during heating mode. In this embodiment, the defrosting start conditions include a temperature drop of the outdoor heat exchanger that is greater than a first temperature change value and less than a second temperature change value, where the temperature drop value is the temperature difference between the initial temperature and the current temperature of the outdoor heat exchanger during the heating operation start-up phase. In other embodiments, the outdoor ambient temperature is lower than a preset ambient temperature threshold and / or the outdoor heat exchanger temperature is lower than a preset temperature threshold, etc.

[0078] In this embodiment, controlling the defrosting operation of the air conditioner includes increasing the opening degree of the throttling device. In this embodiment, the defrosting operation of the air conditioner includes operating the first defrosting mode described above. In other embodiments, the defrosting operation may also include operating the second defrosting mode described above. In other embodiments, controlling the defrosting operation of the air conditioner includes controlling the bypass pipe to open, the bypass pipe connecting the compressor and the outdoor heat exchanger. During the defrosting operation of the air conditioner, the indoor heat exchanger continues to release heat to the indoor environment.

[0079] The first defrosting frequency can be a preset fixed frequency or a frequency determined based on the actual operating conditions of the air conditioner. For example, the first defrosting frequency can be determined based on the compressor's suction pressure, the outdoor heat exchanger temperature, and the outdoor ambient temperature when the air conditioner meets the defrosting start conditions. The first defrosting frequency is less than or equal to the compressor's heating frequency when the air conditioner is in heating mode.

[0080] During the process of reducing the compressor frequency to the first defrosting frequency, the frequency can be reduced in stages to the first frequency, or it can be continuously reduced until the first frequency is reached.

[0081] During the compressor frequency reduction process, low-frequency defrosting can be achieved, the low pressure of the compressor will increase, the suction density of the compressor will increase, and the input power of the compressor will be effectively improved.

[0082] Step S30: When the compressor runs to meet the first condition, control the compressor to increase its frequency to the second defrosting frequency, wherein the first defrosting frequency is less than the second defrosting frequency.

[0083] The first condition may be a condition that the compressor's operating state and / or the state of the indoor and / or outdoor heat exchangers must meet when the heating output of the indoor heat exchanger and / or the outdoor heat exchanger is insufficient. In this embodiment, the first condition is met when the compressor operates at a first frequency for a duration of a first duration. In other embodiments, the first condition may also be met when the temperature drop of the indoor heat exchanger during defrosting operation is greater than a first threshold and / or the temperature change rate of the outdoor heat exchanger is less than a second threshold; or, the first condition may also be met when timing begins from when the compressor starts to reduce its frequency to the first defrosting frequency, and the first condition is met when the accumulated duration reaches a set duration; or, the first condition may also be met when timing begins from when the air conditioner meets the defrosting start conditions, and the first condition is met when the accumulated duration reaches a set duration.

[0084] The second defrosting frequency can be a preset fixed frequency or a frequency determined according to the actual operating conditions of the air conditioner. For example, the second defrosting frequency can be obtained by adjusting the first defrosting frequency according to the preset frequency adjustment value, or the second defrosting frequency can be determined according to the indoor heat exchanger temperature and / or outdoor heat exchanger temperature and / or compressor exhaust temperature when the first condition is met.

[0085] The compressor can continuously increase its frequency from the first defrost frequency to the second defrost frequency until it reaches the second defrost frequency, or it can increase its frequency in stages to reach the second defrost frequency. If the first defrost frequency is increased in stages to reach the second defrost frequency, the temperature fluctuation of the indoor heat exchanger will be smaller, thereby reducing the fluctuation of the indoor temperature; the first defrost frequency can be increased to the second defrost frequency in at least two stages.

[0086] This embodiment provides a control method for an air conditioner. In this scheme, during the defrosting operation of the air conditioner, the compressor no longer operates at a fixed low frequency after frequency reduction, but instead first reduces the frequency and then increases it. The frequency increase in the later stage of defrosting helps to improve the compression ratio and exhaust temperature of the compressor, thereby increasing the temperature of the indoor heat exchanger and the outdoor heat exchanger, increasing the heat transfer temperature difference between the refrigerant and the frost layer, and improving the defrosting effect while reducing indoor temperature fluctuations.

[0087] In one feasible implementation of this embodiment, the air conditioner includes an indoor heat exchanger, a throttling device, and an outdoor heat exchanger connected in sequence. The step of controlling the defrosting operation of the air conditioner includes: controlling the throttling device to increase its opening to a first defrosting opening. That is, step S20 includes:

[0088] Step S21: When the air conditioner meets the defrosting start conditions, control the throttling device to increase the opening degree to the first defrosting opening degree, and control the compressor of the air conditioner to reduce the frequency to the first defrosting frequency.

[0089] The first defrost setting can be a preset fixed setting, or it can be a setting determined based on the actual operating conditions of the air conditioner. For example, the first defrost setting can be determined based on the outdoor ambient temperature and the outdoor heat exchanger temperature when the defrost start conditions are met, and so on.

[0090] In this embodiment, as the throttling device increases its opening to the first defrost opening, the compressor simultaneously reduces its frequency to the first defrost frequency. The time required for the throttling device to increase from the heating opening to the first defrost opening is the same as the time required for the compressor to reduce its frequency from the current frequency to the first defrost frequency.

[0091] In this embodiment, the opening of the throttling device is increased, and the throttling and pressure reduction effect is weakened. As a result, the temperature of the refrigerant entering the outdoor heat exchanger can be effectively increased to provide heat to melt the frost in the outdoor heat exchanger.

[0092] Based on any of the above embodiments, in the second embodiment of this application, the same or similar content as the above embodiments can be referred to the above description, and will not be repeated hereafter. Based on this, please refer to... Figure 4 After step S21, steps S31 and S32 are also included:

[0093] Step S31: When the compressor runs to meet the first condition, control the compressor to increase its frequency to the second defrosting frequency.

[0094] Step S32: When the air conditioner operates to meet the second condition, control the throttling device to increase the opening degree to the second defrosting opening degree, where the second defrosting opening degree is greater than the first defrosting opening degree.

[0095] The second defrost setting can be a preset fixed setting or a setting determined based on the actual operating conditions of the air conditioner. For example, the second defrost setting can be obtained by adjusting the first defrost setting according to a preset setting adjustment value. Alternatively, the second defrost setting can be determined based on the indoor heat exchanger temperature and / or the outdoor heat exchanger temperature and / or the compressor exhaust temperature when the first condition is met.

[0096] The second condition may include a first cumulative duration reaching a set duration, wherein the first cumulative duration begins timing from when the air conditioner meets the defrosting start conditions. Alternatively, the second condition may include a second cumulative duration reaching a set duration, wherein the second cumulative duration begins timing from the start moment when the air conditioner begins to increase the opening of the throttling device to the first defrosting opening. The set duration in the first condition above may be greater than, equal to, or less than the set duration in the second condition here.

[0097] After the throttling device opening is increased and the compressor frequency is reduced, the throttling device can maintain the first defrosting opening.

[0098] In this embodiment, the electronic expansion valve continues to increase its opening while the compressor frequency is increased. This further weakens the throttling effect, resulting in a further increase in both refrigerant temperature and flow rate. This ensures indoor thermal comfort while improving outdoor defrosting performance. Furthermore, the phased increase in the electronic expansion valve opening prevents the refrigerant in the indoor heat exchanger from instantly rushing past the throttling device, which could cause abnormal heat exchanger temperature and trigger compressor frequency reduction. It also effectively reduces indoor refrigerant noise.

[0099] In other embodiments, while the compressor is operating at a second defrosting frequency, the throttling device can also maintain the first defrosting opening.

[0100] Based on any of the above embodiments, in the third embodiment of this application, the same or similar content as the above embodiments can be referred to the above description, and will not be repeated hereafter. In addition, after the step of controlling the compressor of the air conditioner to reduce its frequency to the first defrost frequency, and before the step of controlling the compressor to increase its frequency to the second defrost frequency, the method further includes:

[0101] When the air conditioner meets the defrost start conditions, the indoor fan corresponding to the indoor heat exchanger is controlled to reduce to the defrost speed.

[0102] In this embodiment, the indoor fan is reduced to defrost speed in stages. In other embodiments, the indoor fan may also be continuously reduced to defrost speed.

[0103] In this embodiment, after the compressor operates at the defrost frequency, the indoor fan operates at the defrost speed. This helps to prevent the air conditioner from shutting down due to excessively high indoor heat exchanger temperature, thereby effectively improving the defrost stability of the air conditioner. The indoor fan operates at a lower defrost speed, which can effectively reduce indoor heating while maintaining indoor heat input to ensure indoor thermal comfort. It can also enhance the condensation effect of the indoor heat exchanger during the defrost process, reduce its outlet dryness, reduce the refrigerant flow rate, effectively reduce indoor refrigerant noise, and ensure both defrosting effect and indoor thermal comfort.

[0104] In this embodiment, refer to Figure 5 and Figure 6 Before step S30, steps S201 to S202 are also included:

[0105] Step S201: When the air conditioner meets the defrosting start conditions, control the throttling device to maintain the heating opening, control the compressor to reduce the frequency to the transition frequency, and control the indoor fan to reduce the speed to the first speed.

[0106] The transition frequency and the first speed can be preset fixed parameters, or they can be parameters determined according to the actual operation of the air conditioner. For example, the first speed can be obtained by reducing the heating speed of the indoor fan in heating mode according to the preset speed adjustment value, and the transition frequency can be obtained by reducing the heating frequency of the compressor in heating mode according to the preset frequency adjustment value.

[0107] The compressor can reduce its frequency in stages to a transition frequency, or it can continuously reduce its frequency until it reaches the transition frequency.

[0108] The indoor fan can gradually reduce its speed to the first speed, or it can continuously reduce its speed until it reaches the first speed.

[0109] After step S201, the system determines whether the air conditioner meets the start conditions for the first defrost mode, the second defrost mode, or the third defrost mode based on the temperature status of the outdoor heat exchanger. In other words, it selects the defrost mode that the air conditioner needs to operate in.

[0110] Step S202: When the start-up conditions of the preset defrosting mode are met, control the indoor fan to reduce to the defrosting speed, control the throttling device to increase the opening to the first defrosting opening, and control the compressor of the air conditioner to reduce the frequency to the first defrosting frequency.

[0111] Wherein, the transition frequency is greater than the first defrosting frequency and the second defrosting frequency, the first rotation speed is greater than the defrosting rotation speed, and the heating opening degree is less than the defrosting opening degree.

[0112] In this embodiment, the preset defrost mode is the first defrost mode described above. The activation conditions for the first defrost mode include: the temperature drop of the outdoor heat exchanger in heating mode is greater than or equal to a first temperature threshold and less than or equal to a second temperature threshold, wherein the first temperature threshold is less than the second temperature threshold. The temperature drop value is the temperature difference between the current temperature of the outdoor heat exchanger and the initial temperature of the outdoor heat exchanger in heating mode. In some embodiments, the preset defrost mode is the first defrost mode described above, and the activation conditions for the first defrost mode may include: starting a timer when the air conditioner meets the defrost activation conditions, and when the accumulated time reaches a set time, the activation conditions for the first defrost mode are met.

[0113] In this embodiment, by employing the above-described method, before defrosting is required but before entering defrosting mode, the compressor frequency reduction, indoor fan speed reduction, and electronic expansion valve maintaining their opening work together to reduce the refrigerant condensation effect in the indoor heat exchanger, increasing heat generation and allowing some heat to be stored. This enhances the refrigerant's heat storage capacity, effectively improving the defrosting effect once defrosting mode is entered. Furthermore, the compressor frequency reduction helps prevent excessively high indoor heat exchanger temperatures from causing compressor frequency limiting, shutdown, or triggering of the system's high-pressure protection, thereby effectively improving the system's operational reliability and stability.

[0114] After step S202, if the preset defrosting mode start conditions are not met, the air conditioner can be controlled to run a second defrosting mode or a third defrosting mode according to the start conditions met by the temperature parameters of the indoor heat exchanger. The start conditions for the second defrosting mode include that the temperature drop of the outdoor heat exchanger in the heating mode is less than the first temperature threshold, and the start conditions for the third defrosting mode include that the temperature drop of the outdoor heat exchanger in the heating mode is greater than the second temperature threshold.

[0115] In other embodiments, the indoor fan can be directly controlled to decrease to the defrosting speed, the throttling device can be controlled to increase its opening to the first defrosting opening, and the air conditioner's compressor can be controlled to decrease its frequency to the first defrosting frequency, without performing the start-up condition determination step S201.

[0116] In one feasible implementation of this embodiment, the steps of controlling the compressor to operate at a reduced frequency to a transition frequency and controlling the indoor fan to reduce its speed to a first speed include: controlling the compressor to operate at a reduced frequency to a transition frequency and controlling the indoor fan to operate at a second speed; when a second condition is met, controlling the indoor fan to operate at the first speed; wherein the second speed is greater than the first speed.

[0117] In this embodiment, the second condition includes the indoor fan operating at the second speed for a duration of a second time. In other embodiments, the second condition can be considered satisfied when the temperature of the indoor heat exchanger is greater than a second preset temperature and / or the temperature change value of the indoor heat exchanger is less than a preset value. In some embodiments, the third condition is satisfied when the indoor fan operates at the second speed for a duration greater than or equal to the second time, and the indoor unit of the air conditioner receives an instruction from the outdoor unit to control the indoor fan to reduce its operation to the first speed.

[0118] The second speed can be obtained by reducing the heating speed of the indoor fan through the speed adjustment value.

[0119] In this embodiment, controlling the indoor fan to reduce its operating speed in stages in the manner described above helps to further enhance the heat storage capacity of the indoor heat exchanger before entering the defrosting mode, ensuring that the defrosting efficiency is effectively improved after entering the defrosting mode.

[0120] In other embodiments, during the compressor frequency reduction process, the indoor fan can also be directly reduced to the first speed and maintained at the first speed until the start-up conditions of the preset defrosting mode are met.

[0121] Based on any of the above embodiments, in the fourth embodiment of this application, the same or similar content as the above embodiments can be referred to the above description, and will not be repeated hereafter. After the step of controlling the air conditioner to operate in heating mode, the method further includes: when the air conditioner meets the defrosting start conditions, controlling the outdoor fan corresponding to the outdoor heat exchanger to maintain the current speed; during the defrosting operation of the air conditioner, when the temperature difference between the outdoor heat exchanger and the outdoor ambient temperature is greater than or equal to a preset temperature difference, controlling the outdoor fan to stop.

[0122] In this embodiment, the above method enhances convective heat transfer between outdoor air and the outdoor heat exchanger, effectively utilizing the heat in the outdoor air to defrost the outdoor heat exchanger and thus significantly improving the defrosting effect. Furthermore, when the temperature difference indicates that the outdoor air is insufficient to defrost the outdoor heat exchanger, shutting down the outdoor fan helps ensure the defrosting effect of the outdoor heat exchanger.

[0123] In other embodiments, if the air conditioner meets the defrost start conditions, the outdoor fan can also be controlled to stop until the defrost exit conditions are met.

[0124] Based on any of the above embodiments, in the fifth embodiment of this application, the same or similar content as the above embodiments can be referred to the above description, and will not be repeated hereafter. After step S30, the method further includes: when the air conditioner meets the defrosting end conditions, controlling the compressor to increase its frequency to the heating frequency, and controlling the throttling device to decrease its opening degree to the heating opening degree.

[0125] The defrosting termination condition is the condition that the outdoor heat exchanger's own state parameters and / or the environmental parameters of the environment where the outdoor heat exchanger is located must meet when defrosting is completed.

[0126] In this embodiment, the defrosting termination condition includes at least one of the following: the defrosting time is greater than or equal to a preset defrosting time, and the temperature of the outdoor heat exchanger is greater than a preset temperature. In other embodiments, the defrosting termination condition may also include the outdoor ambient temperature being greater than a preset ambient temperature.

[0127] In this embodiment, the defrosting time is started from the moment the throttling device increases its opening.

[0128] The preset defrosting time ranges from [130s, 180s], for example, 155s. The preset temperature is 2℃, etc.

[0129] Heating speed, heating frequency, and heating opening degree are all operating parameters of the corresponding components during the heating operation of the air conditioner.

[0130] The compressor can be directly boosted to the heating frequency or it can be boosted to the heating frequency in stages.

[0131] The throttling device can directly reduce the opening to the heating opening, or it can reduce the opening to the heating opening in stages.

[0132] During the process of compressor frequency increase and throttling device reduction, indoor fan can increase speed to heating speed, while outdoor fan can remain on or on.

[0133] In this embodiment, the compressor is controlled to increase its frequency to the heating frequency in stages, and the throttling device is controlled to decrease its opening degree to the heating opening degree in stages.

[0134] In this embodiment, refer to Figure 6 The indoor fan operates at the heating speed, the compressor is controlled to increase its frequency to the second frequency, and the throttling device is controlled to decrease its opening to the transition opening. When a third condition is met, the compressor is controlled to increase its frequency to the heating frequency, and the throttling device is controlled to decrease its opening to the heating opening. Wherein, the second frequency is greater than the second defrosting frequency, the second frequency is less than the heating frequency, the transition opening is less than the second defrosting opening, and the transition opening is greater than the heating opening.

[0135] In this embodiment, by adopting the above-described method, after defrosting, all components resume operation of heating parameters, which helps to ensure normal heating of the system and meet the heating needs of indoor users. The defrosting termination conditions set as described above effectively balance indoor comfort and outdoor defrosting performance. After defrosting, the compressor's frequency is increased in stages, and the throttling device's opening degree is reduced in stages, which on the one hand improves the system's operational stability and reliability, and on the other hand further enhances the defrosting effect of the outdoor heat exchanger.

[0136] It should be noted that the above examples are only for understanding this application and do not constitute a limitation on the control method of the air conditioner in this application. Any simple modifications based on this technical concept are within the protection scope of this application.

[0137] This application provides a computer-readable storage medium having computer-readable program instructions (i.e., a computer program) stored thereon, the computer-readable program instructions being used to execute the air conditioner control method of the above embodiments.

[0138] The computer-readable storage medium provided in this application may be, for example, a USB flash drive, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, system, or device. The program code contained on the computer-readable storage medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination thereof.

[0139] The aforementioned computer-readable storage medium may be included in the air conditioner; or it may exist independently and not be installed in the air conditioner.

[0140] The aforementioned computer-readable storage medium carries one or more programs that, when executed by the air conditioner, cause the air conditioner to perform the following process: controlling the air conditioner to operate in heating mode; controlling the air conditioner to operate in defrost mode when the defrost start conditions are met, and controlling the air conditioner's compressor to reduce its frequency to a first defrost frequency; controlling the compressor to increase its frequency to a second defrost frequency when the first condition is met; wherein the first defrost frequency is less than the second defrost frequency, and the indoor heat exchanger is in heating mode during the defrost operation of the air conditioner.

[0141] Computer program code for performing the operations of this application can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a Local Area Network (LAN) or a Wide Area Network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0142] The readable storage medium provided in this application is a computer-readable storage medium that stores computer-readable program instructions (i.e., a computer program) for executing the control method of the air conditioner described above, which can solve the technical problem of how to improve the defrosting effect while reducing indoor temperature fluctuations. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in this application are the same as the beneficial effects of the control method of the air conditioner provided in the above embodiments, and will not be repeated here.

[0143] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0144] It should be understood that the various parts disclosed in this application can be implemented using hardware, software, firmware, or a combination thereof. Modules described in the embodiments of this application can be implemented in software or hardware. The names of modules do not necessarily limit the specific unit itself. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0145] The above descriptions are merely some embodiments of this application and do not limit the patent scope of this application. Any equivalent structural transformations made based on the technical concept of this application and the content of this specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application. Therefore, the protection scope of this application should be determined by the scope of the claims.

Claims

1. A control method for an air conditioner, characterized in that, The air conditioner includes an indoor heat exchanger, a throttling device, and an outdoor heat exchanger connected in sequence, and the method includes: Control the air conditioner to operate in heating mode; When the air conditioner meets the defrosting start conditions, the throttling device is controlled to increase its opening to the first defrosting opening, and the compressor of the air conditioner is controlled to reduce its frequency to the first defrosting frequency. When the compressor operates to the point where the first condition is met, the compressor is controlled to increase its frequency to the second defrosting frequency. Wherein, the first defrosting frequency is less than the second defrosting frequency, and the indoor heat exchanger is in heating mode during the defrosting operation of the air conditioner; After controlling the throttling device to increase its opening to the first defrosting opening and controlling the air conditioner's compressor to reduce its frequency to the first defrosting frequency, the method further includes: When the compressor runs to meet the first condition, the compressor is controlled to increase its frequency to the second defrosting frequency. When the air conditioner operates to meet the second condition, the throttling device is controlled to increase its opening to the second defrosting opening. Wherein, the second defrost opening is greater than the first defrost opening; After the step of controlling the compressor of the air conditioner to reduce its frequency to a first defrost frequency, and before the step of controlling the compressor to increase its frequency to a second defrost frequency, the method further includes: When the air conditioner meets the defrost start conditions, the indoor fan corresponding to the indoor heat exchanger is controlled to reduce to the defrost speed.

2. The method as described in claim 1, characterized in that, Before the step of controlling the compressor to increase its frequency to the second defrost frequency when the compressor operates to meet the first condition, the method further includes: When the air conditioner meets the defrosting start conditions, the throttling device is controlled to maintain the heating opening, the compressor is controlled to reduce its frequency to the transition frequency, and the indoor fan is controlled to reduce its speed to the first speed. When the preset defrosting mode start conditions are met, the indoor fan is controlled to decrease to the defrosting speed, the throttling device is controlled to increase its opening to the first defrosting opening, and the air conditioner compressor is controlled to decrease its frequency to the first defrosting frequency. Wherein, the transition frequency is greater than the first defrosting frequency and the second defrosting frequency, the first rotation speed is greater than the defrosting rotation speed, and the heating opening degree is less than the defrosting opening degree.

3. The method as described in claim 2, characterized in that, The steps of controlling the compressor to operate at a reduced frequency to a transition frequency and controlling the indoor fan to reduce its speed to a first speed include: The compressor is controlled to operate at a reduced frequency to a transition frequency, and the indoor fan is controlled to operate at a reduced speed to the second speed. When the third condition is met, the indoor fan is controlled to reduce to the first speed. The second rotational speed is greater than the first rotational speed.

4. The method according to any one of claims 1 to 3, characterized in that, Following the step of controlling the air conditioner to operate in heating mode, the method further includes: When the air conditioner meets the defrost start conditions, the outdoor fan corresponding to the outdoor heat exchanger is controlled to maintain the current speed. During the defrosting operation of the air conditioner, when the temperature difference between the outdoor heat exchanger and the outdoor ambient temperature is greater than or equal to a preset temperature difference, the outdoor fan is controlled to stop.

5. The method according to any one of claims 1 to 3, characterized in that, After the step of controlling the compressor to increase its frequency to the second defrosting frequency when the compressor operates to meet the first condition, the method further includes: When the air conditioner meets the defrosting end conditions, the compressor is controlled to increase its frequency to the heating frequency, and the throttling device is controlled to reduce its opening to the heating opening.

6. The method as described in claim 5, characterized in that, The steps of controlling the compressor to operate at the heating frequency and controlling the throttling device to reduce its opening to the heating opening include: The compressor is controlled to gradually increase its frequency to the heating frequency, and the throttling device is controlled to gradually decrease its opening to the heating opening.

7. An air conditioner, characterized in that, The air conditioner includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the control method for the air conditioner as described in any one of claims 1 to 6.

8. A storage medium, characterized in that, The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, it implements the steps of the control method for the air conditioner as described in any one of claims 1 to 6.

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