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 air conditioner comprises a compressor, an indoor heat exchanger, a throttling device and an outdoor heat exchanger which are connected in sequence. The indoor heat exchanger is provided with an indoor fan. The method comprises the following steps: controlling the air conditioner to run in a heating mode; in the case that the air conditioner meets defrosting starting conditions, controlling the throttling device to keep the current opening degree, the compressor to reduce the frequency to a transition frequency, and the indoor fan to reduce the rotation speed to a transition rotation speed to run, so that the temperature of the indoor heat exchanger is increased and the temperature of the indoor heat exchanger is less than a preset temperature. The application aims to ensure the defrosting effect and reduce the indoor temperature fluctuation.

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, indoor fans generally need to operate at a lower defrost speed in defrost mode. When the air conditioner switches from heating to defrost mode, the indoor fan directly reduces from the heating speed to the defrost speed. The indoor heat exchanger temperature is prone to overheating, triggering the air conditioner's protection shutdown and causing the air conditioner to fail to defrost properly. 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 ensure defrosting effect while improving the stability of air conditioner operation.

[0005] To achieve the above objectives, this application proposes a control method for an air conditioner, the air conditioner comprising a compressor and an indoor heat exchanger, a throttling device, and an outdoor heat exchanger connected in sequence, wherein an indoor fan is correspondingly provided for the indoor heat exchanger, and the method includes:

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

[0007] When the air conditioner meets the defrosting start conditions, the throttling device is controlled to maintain its current opening, the compressor frequency is reduced to the transition frequency, and the indoor fan is controlled to reduce its speed to the transition speed, so that the indoor heat exchanger temperature increases and the indoor heat exchanger temperature is lower than the preset temperature.

[0008] In one embodiment, the steps of controlling the compressor to reduce its frequency to a transition frequency and controlling the indoor fan to reduce its speed to a transition speed include:

[0009] The compressor is controlled to reduce its frequency to the transition frequency according to the target frequency reduction ratio and / or the temperature of the indoor heat exchanger; the indoor fan is controlled to reduce its speed to the transition speed according to the target speed reduction ratio and / or the temperature of the indoor heat exchanger.

[0010] Wherein, the target frequency reduction ratio is greater than the target speed reduction ratio.

[0011] In one embodiment, the method further includes:

[0012] The target frequency reduction ratio is obtained by reducing the target frequency reduction ratio according to the preset adjustment parameters.

[0013] In one embodiment, after the steps of controlling the throttling device to maintain its current opening, reducing the compressor frequency to a transition frequency, and controlling the indoor fan to operate at a transition speed, the method further includes:

[0014] The system controls the throttling device to increase to the first defrosting opening, the compressor to reduce its frequency to the defrosting frequency, and the indoor fan to reduce its speed to the defrosting speed.

[0015] In one embodiment, the steps of controlling the throttling device to increase to a first defrost opening, reducing the compressor frequency to the defrost frequency, and controlling the indoor fan to operate at a defrost speed include:

[0016] When the air conditioner meets the first preset condition, the indoor fan is controlled to reduce to the defrosting speed.

[0017] When the air conditioner meets the second preset condition, the compressor is controlled to operate at a frequency reduced to the defrosting frequency, and the throttling device is controlled to operate at a second defrosting opening degree.

[0018] When the first condition is met, the throttling device is controlled to increase to the first defrosting opening degree;

[0019] Wherein, the first defrost opening is greater than the second defrost opening.

[0020] In one embodiment, before the steps of controlling the throttling device to increase to the first defrost opening, reducing the compressor frequency to the defrost frequency, and controlling the indoor fan to reduce to the defrost speed, the method further includes:

[0021] Obtain the flow area parameters of the throttling device, the refrigerant flow rate at the inlet side of the throttling device, and the cylinder volume parameters of the compressor;

[0022] The frequency range of the compressor is determined based on the flow area parameter, the refrigerant flow rate, and the volume parameter.

[0023] The defrosting frequency is determined within the specified frequency range.

[0024] In one embodiment, the steps of controlling the throttling device to increase to a first defrost opening, reducing the compressor frequency to the defrost frequency, and controlling the indoor fan to operate at a defrost speed include:

[0025] According to the target ratio, the throttling device is increased to the first defrost opening, the compressor frequency is reduced to the defrost frequency, and the indoor fan is reduced to the defrost speed.

[0026] Wherein, the defrosting heat corresponding to the target ratio is greater than or equal to the indoor heating capacity of the air conditioner, and / or, the difference between the defrosting heat corresponding to the target ratio and the indoor heating capacity is less than the preset heat.

[0027] In one embodiment, after the steps of controlling the throttling device to increase to the first defrost opening, reducing the compressor frequency to the defrost frequency, and controlling the indoor fan to reduce to the defrost speed, the method further includes:

[0028] When the air conditioner meets the defrosting end conditions, the indoor fan is controlled to increase to the heating speed, the compressor is controlled to increase to the heating frequency, and the throttling device is controlled to decrease to the heating opening.

[0029] In one embodiment, the steps of controlling the indoor fan to operate at heating speed, controlling the compressor to operate at heating frequency, and controlling the throttling device to reduce its opening to the heating opening include:

[0030] The indoor fan is controlled to operate at a heating speed, the compressor is controlled to increase its frequency to a second frequency, and the throttling device is controlled to reduce its opening to a transitional opening.

[0031] When the 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.

[0032] Wherein, the second frequency is greater than the defrosting frequency, the second frequency is less than the heating frequency, the transition opening is less than the first defrosting opening, and the transition opening is greater than the heating opening.

[0033] In one 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.

[0034] Furthermore, to achieve the above objectives, this application also proposes an air conditioner, which includes a control device, a compressor, and an indoor heat exchanger, a throttling device, and an outdoor heat exchanger connected in sequence. The indoor heat exchanger is equipped with an indoor fan, and the indoor fan, the throttling device, and the compressor are all connected to the control device. The control device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. The computer program is configured to implement the steps of the control method for the air conditioner as described above.

[0035] 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.

[0036] The present application proposes one or more technical solutions, which have at least the following technical effects: When the air conditioner is in heating mode and needs to defrost, the indoor fan speed is not directly reduced to the defrosting speed. Instead, before entering the defrosting operation, the throttling device maintains its current opening, and the indoor fan is reduced to a transition speed to increase the temperature of the indoor heat exchanger. This can store heat for the subsequent defrosting process and avoid the indoor temperature from dropping too low during the defrosting process. Reducing the compressor's operating frequency can effectively prevent the indoor heat exchanger temperature from getting too high, which can effectively reduce the risk of the air conditioner shutting down. Based on this, the cooperation of the above components can ensure the defrosting effect while improving the operational stability of the air conditioner. Attached Figure Description

[0037] 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.

[0038] 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.

[0039] Figure 1 This is a schematic diagram of the system structure of an embodiment of the air conditioner of this application;

[0040] 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;

[0041] Figure 3 This is a flowchart illustrating an embodiment of the control method for an air conditioner according to this application.

[0042] Figure 4 This is a flowchart illustrating Embodiment 2 of the control method for the air conditioner of this application;

[0043] Figure 5 This is a detailed flowchart of step S30 in Embodiment 2 of the control method for the air conditioner of this application;

[0044] 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.

[0045] 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

[0046] 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.

[0047] 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.

[0048] The main solution of this application embodiment is: a control method based on an air conditioner, the air conditioner including a compressor and an indoor heat exchanger, a throttling device and an outdoor heat exchanger connected in sequence, the indoor heat exchanger being equipped with an indoor fan, the method including: controlling the air conditioner to operate in heating mode; when the air conditioner meets the defrosting start conditions, controlling the throttling device to maintain its current opening, the compressor to reduce its frequency to a transition frequency and the indoor fan to reduce its speed to a transition speed, so as to raise the temperature of the indoor heat exchanger and make the temperature of the indoor heat exchanger lower than a preset temperature.

[0049] In this embodiment, for ease of description, the following description uses an air conditioner as the subject of execution.

[0050] Because in existing technology, the indoor fan generally needs to operate at a lower defrost speed in defrost mode, when the air conditioner switches from heating to defrost mode, the indoor fan directly reduces from the heating speed to the defrost speed. The indoor heat exchanger temperature is prone to getting too high, triggering the air conditioner's protection shutdown, which causes the air conditioner to fail to defrost normally.

[0051] This application provides the above solution, in which, during the defrosting operation of the air conditioner in heating mode, the indoor fan speed is not directly reduced to the defrosting speed. Instead, before entering defrosting operation, the throttling device maintains its current opening, and the indoor fan is reduced to a transition speed to raise the temperature of the indoor heat exchanger. This allows for heat storage for the subsequent defrosting process, preventing the indoor temperature from dropping significantly due to excessively low indoor heat exchanger temperature. Reducing the compressor's operating frequency effectively prevents the indoor heat exchanger temperature from becoming too high, thus effectively reducing the risk of air conditioner shutdown. Based on this, the cooperation of the above components can ensure the defrosting effect while improving the operational stability of the air conditioner.

[0052] 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.

[0053] 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 reversing assembly 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 reversing assembly 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 reversing assembly 2, the throttling device 4, the outdoor fan 9, and the indoor fan 8 are all connected to the control device 100. The throttling device can be an electronic expansion valve.

[0054] 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.

[0055] 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.

[0056] Based on the above settings, the operating modes of an air conditioner include at least the following:

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] In this embodiment, refer to Figure 1 The air conditioner also includes a refrigerant heat dissipation assembly 5 and a one-way throttling device 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, the throttling device 4, the refrigerant heat dissipation assembly 5, the one-way throttling device 6, and the indoor heat exchanger 7 are connected in sequence. The one-way throttling device 6 is configured to throttle the refrigerant in one direction when it flows from the refrigerant heat dissipation assembly 5 to the indoor heat exchanger 7, and not throttle the refrigerant when it flows from the indoor heat exchanger 7 to the refrigerant heat dissipation assembly 5.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] The following is for reference. Figure 2 The 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.

[0069] like Figure 2As 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] Based on this, the present application provides 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.

[0074] In this embodiment, the control method of the air conditioner includes steps S10 to S20:

[0075] Step S10: Control the air conditioner to operate in heating mode;

[0076] During the operation of the air conditioner in heating mode, the reversing 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.

[0077] Step S20: When the air conditioner meets the defrosting start conditions, control the throttling device to maintain its current opening, reduce the compressor frequency to the transition frequency, and control the indoor fan to reduce its speed to the transition speed, so as to raise the temperature of the indoor heat exchanger and make the temperature of the indoor heat exchanger lower than the preset temperature.

[0078] In step S20, the difference between the current coil temperature of the outdoor heat exchanger and the heating coil temperature of the outdoor heat exchanger when the air conditioner is in heating mode is less than the set temperature value, which is less than or equal to 3°C. This prevents the outdoor heat exchanger from becoming too frosty and facilitates subsequent defrosting operations.

[0079] 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 is frosted and needs to be defrosted in heating mode. For example, the outdoor ambient temperature is lower than the preset ambient temperature threshold and / or the outdoor heat exchanger temperature is lower than the preset temperature threshold, etc.

[0080] When the air conditioner meets the defrosting start conditions, the commutation component can be controlled to maintain its current operation.

[0081] The transition frequency and transition speed can be preset fixed parameters, or they can be parameters determined according to the actual operation of the air conditioner. For example, the transition 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.

[0082] The preset temperature is the maximum temperature of the indoor heat exchanger that the air conditioner's reliability allows.

[0083] The current opening degree maintained by the throttling device is the heating opening degree of the throttling device during the operation of the air conditioner in heating mode.

[0084] The compressor can continuously reduce its frequency from the heating frequency to the transition frequency at the target reduction rate, or it can reduce its frequency from the heating frequency to the transition frequency in stages. The indoor fan can continuously reduce its speed from the heating speed to the transition speed at the target reduction rate, or it can reduce its speed from the heating speed to the transition speed in stages.

[0085] In this embodiment, the indoor fan operates at a reduced speed while the compressor operates at a reduced frequency. In other implementations, the compressor may first operate at a reduced frequency for a period of time before the indoor fan operates at a reduced speed.

[0086] This embodiment provides a control method for an air conditioner. During the defrosting process in the air conditioner's heating mode, the indoor fan speed is not directly reduced to the defrosting speed. Instead, before entering defrosting mode, the throttling device maintains its current opening, and the indoor fan is reduced to a transition speed to raise the temperature of the indoor heat exchanger. This allows for heat storage for the subsequent defrosting process, preventing a significant drop in indoor temperature due to excessively low indoor heat exchanger temperature. Furthermore, reducing the compressor's operating frequency effectively prevents excessively high indoor heat exchanger temperatures, thus reducing the risk of air conditioner shutdown. Therefore, the cooperation of these components ensures effective defrosting while improving the air conditioner's operational stability.

[0087] In one feasible implementation, the steps of controlling the compressor to reduce its frequency to a transition frequency and controlling the indoor fan to reduce its speed to a transition speed include:

[0088] The compressor is controlled to reduce its frequency to the transition frequency according to the target frequency reduction ratio and / or the temperature of the indoor heat exchanger; the indoor fan is controlled to reduce its speed to the transition speed according to the target speed reduction ratio and / or the temperature of the indoor heat exchanger.

[0089] Wherein, the target frequency reduction ratio is greater than the target speed reduction ratio.

[0090] The target frequency reduction ratio is the magnitude of the compressor's frequency reduction and its proportion within the compressor's heating frequency in heating mode. The target speed reduction ratio is the magnitude of the indoor fan speed reduction and its proportion within the indoor fan's heating speed in heating mode. The transition frequency is determined based on the heating frequency and the target frequency reduction ratio; the transition speed is determined based on the ratio of the heating speed to the target speed.

[0091] The target frequency reduction ratio and the target speed reduction ratio satisfy a preset quantitative relationship. In this embodiment, the target frequency reduction ratio is obtained by reducing the target frequency reduction ratio according to a preset adjustment parameter. For example, if the preset adjustment parameter is 0.8, then the target speed reduction ratio = 0.8 * target frequency reduction ratio.

[0092] The purpose of controlling the compressor to reduce its frequency and the indoor fan to reduce its speed based on the temperature of the indoor heat exchanger is to ensure that the temperature of the indoor heat exchanger does not exceed the preset temperature. During compressor frequency reduction, when the indoor heat exchanger temperature is below the preset temperature, the compressor maintains a reduced frequency to a transition frequency; when the indoor heat exchanger temperature is above or equal to the preset temperature, the compressor stops reducing its frequency and maintains its current frequency. Similarly, during indoor fan speed reduction, when the indoor heat exchanger temperature is below the preset temperature, the indoor fan maintains a reduced speed to a transition speed; when the indoor heat exchanger temperature is above or equal to the preset temperature, the indoor fan stops reducing its speed and maintains its current speed. Alternatively, the target frequency reduction ratio can be determined based on the initial temperature of the indoor heat exchanger when the defrosting start conditions are met, and the target speed reduction ratio can be obtained by reducing the target frequency reduction ratio according to preset adjustment parameters. Or, the target speed reduction ratio can be determined based on the initial temperature of the indoor heat exchanger when the defrosting start conditions are met, and the target frequency reduction ratio can be determined based on preset adjustment parameters and the target speed reduction ratio.

[0093] In this embodiment, the above method helps to improve the heat storage capacity to enhance defrosting efficiency and ensure the reliability of system operation.

[0094] 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 and Figure 6 After the steps of controlling the throttling device to maintain its current opening, reducing the compressor frequency to a transition frequency, and controlling the indoor fan to reduce its speed to a transition speed, the method further includes:

[0095] Step S30: Control the throttling device to increase to the first defrost opening, control the compressor to reduce its frequency to the defrost frequency, and control the indoor fan to reduce its speed to the defrost speed.

[0096] The first defrosting setting here may include the second or third setting mentioned above, and the throttling device may increase from the first setting to the second setting or from the first setting to the third setting. When the throttling device is operating at the second setting, the air conditioner is in the first defrosting mode; when the throttling device is operating at the third setting, the air conditioner is in the second defrosting mode.

[0097] In one implementation, the indoor fan is controlled to gradually decrease from the transition speed to the defrost speed. In another implementation, the indoor fan is controlled to continuously decrease from the transition speed to the defrost speed.

[0098] During the process of the indoor fan reducing to the defrosting speed, the throttling device increases its opening or maintains the heating opening, and the compressor can reduce its frequency or maintain the heating frequency.

[0099] In this embodiment, the indoor fan first reduces to the defrost speed. While maintaining the defrost speed, the steps of controlling the throttling device to increase to the first defrost opening and the compressor to reduce its frequency to the defrost frequency are executed. In other embodiments, the indoor fan may also reduce to the defrost speed while the throttling device increases to the first defrost opening and the compressor reduces its frequency to the defrost frequency.

[0100] During the operation of the indoor fan at defrost speed, the throttling device is controlled to gradually increase its opening to the first defrost opening. This means the throttling device increases to at least one intermediate opening and maintains operation for a preset duration before increasing to the first defrost opening. This phased increase in the throttling device opening to the first defrost opening effectively prevents rapid opening changes that could lead to oil shortage in the system. It also controls the refrigerant migration speed, ensuring a balance between indoor heating and outdoor defrosting heat extraction, reducing refrigerant noise caused by excessive refrigerant migration, thereby effectively reducing reliability risks during defrosting, improving defrosting efficiency, and reducing refrigerant noise. During the phased increase in the throttling device opening to the first defrost opening, the compressor continuously reduces its frequency to the defrost frequency. In other embodiments, the throttling device can also be controlled to continuously increase its opening to the first defrost opening, while the compressor's frequency is controlled to gradually decrease to the defrost frequency.

[0101] In this embodiment, the throttling device, indoor fan and compressor work in coordination to achieve a balance between the defrosting heat of the outdoor heat exchanger and the indoor heating, reducing the occurrence of excessive defrosting heat and insufficient indoor heating or insufficient defrosting heat and excessive indoor heating, thereby ensuring the defrosting effect while reducing indoor temperature fluctuations.

[0102] In one feasible implementation, the steps of controlling the throttling device to increase to a first defrost opening, reducing the compressor frequency to the defrost frequency, and controlling the indoor fan to operate at a defrost speed include: controlling the throttling device to increase to a first defrost opening, reducing the compressor frequency to the defrost frequency, and controlling the indoor fan to operate at a defrost speed according to a target ratio; wherein, the defrost heat corresponding to the target ratio is greater than or equal to the indoor heat supply of the air conditioner, and / or, the difference between the defrost heat corresponding to the target ratio and the indoor heat supply is less than a preset heat.

[0103] Defrosting heat is the heat released by the outdoor heat exchanger for defrosting. Indoor heating is the heat released by the indoor heat exchanger and delivered into the indoor space by the action of the indoor fan.

[0104] The target ratio is the proportion of outdoor heat exchangers that defrost within a preset time and indoor temperature fluctuations that are less than the preset temperature value. For example, the preset temperature value here is 3℃. The preset time range is [130s, 180s].

[0105] The target ratio ranges from [1, 2], for example, a target ratio of 1.2. Based on this, it can be ensured that both defrosting requirements and indoor comfort requirements are met simultaneously.

[0106] In this embodiment, the control methods for controlling the operation of the above-mentioned components according to the target ratio include, but are not limited to, at least one of the following: control of the opening change process (continuously increasing the opening or increasing the opening in segments, setting the intermediate opening when increasing the opening in segments, the target rate of opening change, etc.), setting the first defrosting opening, and the timing of increasing the opening; control of the frequency change process (continuously decreasing the frequency or decreasing the frequency in segments, setting the intermediate frequency when decreasing the frequency in segments, the target rate of frequency change, etc.), setting the defrosting frequency, and the timing of decreasing the frequency; control of the speed change process (continuously decreasing the speed or decreasing the speed in segments, setting the intermediate speed when decreasing the speed in segments, the target rate of speed change, etc.), setting the defrosting speed, and the timing of decreasing the speed, etc.

[0107] In this embodiment, the above method helps to further improve the accuracy of indoor heating and defrosting heat distribution, and effectively balances defrosting effect and indoor comfort.

[0108] In one feasible implementation, combined with Figure 5 and Figure 6 The steps of controlling the throttling device to increase to the first defrost opening, reducing the compressor frequency to the defrost frequency, and controlling the indoor fan to reduce to the defrost speed include steps S31 to S33:

[0109] Step S31: When the air conditioner meets the first preset condition, control the indoor fan to reduce to the defrosting speed.

[0110] In this embodiment, the first preset condition includes a cumulative duration reaching a first preset duration. The cumulative duration starts counting from the initial moment when the air conditioner meets the defrosting start condition. The first preset duration is the sum of a pre-set transition duration and an instruction duration. The transition duration is the total duration for the steps of controlling the throttling device to maintain its current opening, reducing the compressor frequency to the transition frequency, and controlling the indoor fan to reduce its speed after the air conditioner meets the defrosting start condition. The instruction duration is the time required for the outdoor unit of the air conditioner to send the instruction "the indoor fan should be reduced to the defrosting speed" to the indoor unit to receive the instruction.

[0111] Step S32: When the air conditioner meets the second preset condition, control the compressor to reduce its frequency to the defrosting frequency and control the throttling device to increase its operation to the second defrosting opening degree; wherein, the first defrosting opening degree is greater than the second defrosting opening degree;

[0112] In this embodiment, the second preset condition includes the cumulative time reaching the second preset time. The cumulative time is counted from the start time when the air conditioner meets the defrosting start condition. The second preset time is the sum of the first preset time and the third preset time. The third preset time is the time during which the indoor fan runs at the defrosting speed before the air conditioner enters the defrosting mode.

[0113] While the indoor fan is maintaining the defrosting speed, the compressor frequency is reduced and the throttling device is opened wider.

[0114] In this embodiment, while the compressor operates at a frequency reduced to the defrosting frequency, the compressor opening is increased to the second defrosting opening. The time required for the compressor to operate at a frequency reduced from the current frequency to the defrosting frequency is the same as the time required for the throttling device to increase from the heating opening to the second defrosting opening.

[0115] Step S33: When the first condition is met, control the throttling device to increase to the first defrosting opening.

[0116] In this embodiment, the first condition may include a timing duration reaching a fourth preset duration, the timing duration starting from the start time when the air conditioner meets the second preset condition. In other embodiments, the first condition may be considered met when the temperature of the indoor heat exchanger is greater than a first preset temperature and the temperature change value of the indoor heat exchanger is less than a preset value.

[0117] The first and second defrost openings can be preset fixed openings, or they can be determined based on the actual operating conditions of the air conditioner. For example, the defrost frequency, defrost speed, first defrost opening, and second defrost opening can be determined based on the temperature difference between the outdoor and indoor ambient temperatures, as well as the temperature difference between the indoor ambient temperature and the set temperature.

[0118] In this embodiment, after step S33, the compressor can maintain the defrosting frequency, the indoor fan can maintain the defrosting speed, and the throttling device can maintain the first defrosting opening until the defrosting end condition is met.

[0119] In this embodiment, the indoor fan speed control, compressor frequency control, and throttling device opening adjustment work together to ensure that the ratio of defrosting heat to indoor heating reaches the target ratio, thereby guaranteeing defrosting effectiveness while reducing indoor temperature fluctuations. Adjusting the compressor frequency and throttling device opening while maintaining a stable indoor fan speed helps improve the accuracy of the distribution between indoor heating and outdoor defrosting heat.

[0120] In other embodiments, after step S33, the actual ratio of defrosting heat to indoor heating can be determined based on the outdoor heat exchanger temperature and the air outlet temperature of the air conditioner. The compressor operating frequency and / or the indoor fan speed are adjusted based on the deviation between the actual ratio and the target ratio to further ensure that the actual ratio reaches the target ratio, guaranteeing defrosting effectiveness while reducing indoor temperature fluctuations. The actual ratio can be determined based on the real-time detected relationship between the outdoor heat exchanger temperature and the indoor heat exchanger temperature.

[0121] 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. Based on this, in this embodiment, before the steps of controlling the throttling device to increase to the first defrost opening, reducing the compressor frequency to the defrost frequency, and controlling the indoor fan to reduce to the defrost speed, the method further includes: obtaining the flow area parameter of the throttling device, the refrigerant flow velocity at the inlet side of the throttling device, and the cylinder volume parameter of the compressor; determining the frequency range of the compressor based on the flow area parameter, the refrigerant flow velocity, and the volume parameter; and determining the defrost frequency within the frequency range.

[0122] The flow area parameter is a characteristic parameter representing the flow area of ​​the throttling device when it is operating at the first defrosting opening. The flow area parameter includes at least one of the following: flow area, throttling device diameter, defrosting opening, pressure difference between the inlet and outlet of the throttling device, etc.

[0123] The refrigerant flow rate can be detected by a flow rate sensor located on the inlet side of the throttling device.

[0124] Volumetric parameters are characteristic parameters that represent the cylinder volume. Volumetric parameters may include volume, cylinder bore, cylinder length, width, and height, etc.

[0125] In this embodiment, the upper frequency limit and / or lower frequency limit are determined based on the volume parameters, flow area parameters, and refrigerant flow rate, and the range corresponding to the upper frequency limit and / or lower frequency limit is taken as the frequency range.

[0126] In this embodiment, the above method can ensure both indoor thermal comfort and outdoor defrosting effect while improving system energy efficiency.

[0127] 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. In addition, after step S30, the method further includes:

[0128] When the air conditioner meets the defrosting end conditions, the indoor fan is controlled to increase to the heating speed, the compressor is controlled to increase to the heating frequency, and the throttling device is controlled to decrease to the heating opening.

[0129] 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.

[0130] 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.

[0131] In this embodiment, the defrosting time is started from the moment the throttling device increases its opening.

[0132] The preset defrosting time ranges from [130s, 180s], for example, 155s. The preset temperature is 2℃, etc.

[0133] Heating speed, heating frequency, and heating opening degree are all operating parameters of the corresponding components in the heating mode of the air conditioner.

[0134] The indoor fan can be directly increased to the heating speed, or the speed can be gradually increased to the heating speed.

[0135] The compressor can be directly boosted to the heating frequency or it can be boosted to the heating frequency in stages.

[0136] The throttling device can directly reduce the opening to the heating opening, or it can reduce the opening to the heating opening in stages.

[0137] In this embodiment, combined with Figure 6 The system controls the indoor fan to operate at a heating speed, controls the compressor to operate at a second frequency, and controls the throttling device to reduce its opening to a transitional opening. When a third condition is met, the system controls the compressor to operate at the heating frequency and controls the throttling device to reduce its opening to the heating opening. The second frequency is greater than the defrosting frequency, the second frequency is less than the heating frequency, the transitional opening is less than the first defrosting opening, and the transitional opening is greater than the heating opening.

[0138] 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.

[0139] 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.

[0140] 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.

[0141] 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.

[0142] 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.

[0143] 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 processes: controlling the air conditioner to operate in heating mode; and, when the air conditioner meets the defrosting start conditions, controlling the throttling device to maintain its current opening, reducing the compressor frequency to a transition frequency, and controlling the indoor fan to reduce its speed to a transition speed, so as to raise the temperature of the indoor heat exchanger and lower the indoor heat exchanger temperature below a preset temperature.

[0144] 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).

[0145] 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 ensure 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.

[0146] 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.

[0147] 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.

[0148] 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 a compressor and an indoor heat exchanger, a throttling device, and an outdoor heat exchanger connected in sequence. An indoor fan is correspondingly installed on the indoor heat exchanger. 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 maintain its current opening, the compressor frequency is reduced to the transition frequency, and the indoor fan is controlled to reduce its speed to the transition speed, so that the indoor heat exchanger temperature increases and the indoor heat exchanger temperature is lower than the preset temperature. The system controls the throttling device to increase to the first defrost opening, the compressor to reduce its frequency to the defrost frequency, and the indoor fan to reduce its speed to the defrost speed. The steps of controlling the compressor to reduce its frequency to a transition frequency and controlling the indoor fan to reduce its speed to a transition speed include: The compressor is controlled to reduce its frequency to the transition frequency according to the target frequency reduction ratio and / or the temperature of the indoor heat exchanger; the indoor fan is controlled to reduce its speed to the transition speed according to the target speed reduction ratio and / or the temperature of the indoor heat exchanger. Wherein, the target frequency reduction ratio is greater than the target speed reduction ratio; The steps of controlling the throttling device to increase to the first defrost opening, reducing the compressor frequency to the defrost frequency, and controlling the indoor fan to reduce to the defrost speed include: When the air conditioner meets the first preset condition, the indoor fan is controlled to reduce to the defrosting speed. When the air conditioner meets the second preset condition, the compressor is controlled to operate at a frequency reduced to the defrosting frequency, and the throttling device is controlled to operate at a second defrosting opening degree. When the first condition is met, the throttling device is controlled to increase to the first defrosting opening degree; Wherein, the first defrost opening is greater than the second defrost opening.

2. The method as described in claim 1, characterized in that, The method further includes: The target frequency reduction ratio is obtained by reducing the target frequency reduction ratio according to the preset adjustment parameters.

3. The method as described in claim 1 or 2, characterized in that, Before the steps of controlling the throttling device to increase to the first defrost opening, reducing the compressor frequency to the defrost frequency, and controlling the indoor fan to reduce to the defrost speed, the method further includes: Obtain the flow area parameters of the throttling device, the refrigerant flow rate at the inlet side of the throttling device, and the cylinder volume parameters of the compressor; The frequency range of the compressor is determined based on the flow area parameter, the refrigerant flow rate, and the volume parameter. The defrosting frequency is determined within the specified frequency range.

4. The method as described in claim 1 or 2, characterized in that, The steps of controlling the throttling device to increase to the first defrost opening, reducing the compressor frequency to the defrost frequency, and controlling the indoor fan to reduce to the defrost speed include: According to the target ratio, the throttling device is increased to the first defrost opening, the compressor frequency is reduced to the defrost frequency, and the indoor fan is reduced to the defrost speed. Wherein, the defrosting heat corresponding to the target ratio is greater than or equal to the indoor heating capacity of the air conditioner, and / or, the difference between the defrosting heat corresponding to the target ratio and the indoor heating capacity is less than the preset heat.

5. The method as described in claim 1 or 2, characterized in that, After the steps of controlling the throttling device to increase to the first defrost opening, reducing the compressor frequency to the defrost frequency, and controlling the indoor fan to reduce to the defrost speed, the method further includes: When the air conditioner meets the defrosting end conditions, the indoor fan is controlled to increase to the heating speed, the compressor is controlled to increase to the heating frequency, and the throttling device is controlled to decrease to the heating opening.

6. The method as described in claim 5, characterized in that, The steps of controlling the indoor fan to operate at heating speed, controlling the compressor to operate at heating frequency, and controlling the throttling device to reduce its opening to the heating opening include: The indoor fan is controlled to operate at a heating speed, the compressor is controlled to increase its frequency to a second frequency, and the throttling device is controlled to reduce its opening to a transitional opening. When the 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 defrosting frequency, the second frequency is less than the heating frequency, the transition opening is less than the first defrosting opening, and the transition opening is greater than the heating opening.

7. The method as described in claim 5, characterized in that, The defrosting termination conditions include at least one of the following: the defrosting time is greater than or equal to the preset defrosting time, and the temperature of the outdoor heat exchanger is greater than the preset temperature.

8. An air conditioner, characterized in that, The air conditioner includes a control device, a compressor, and an indoor heat exchanger, a throttling device, and an outdoor heat exchanger connected in sequence. The indoor heat exchanger is equipped with an indoor fan. The indoor fan, the throttling device, and the compressor are all connected to the control device. The control device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. The computer program is configured to implement the steps of the control method for the air conditioner as described in any one of claims 1 to 7.

9. 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 7.

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