Control method of air conditioner, air conditioner and storage medium

Abstract

The invention 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 steps that the air conditioner is controlled to operate in a heating mode, in the heating mode, a first heat exchanger of the air conditioner is in a condensation state, and a second heat exchanger of the air conditioner is in an evaporation state; under the condition that the air conditioner meets the preset condition indicating that the second heat exchanger has the defrosting risk, the defrosting frequency is obtained, and the defrosting frequency is the occurrence frequency that the frosting thickness of the second heat exchanger is smaller than the preset thickness when a defrosting mode is started before the current moment; and the judgment moment of defrosting starting is determined according to the number of defrosting times, and whether the air conditioner starts a defrosting mode or not is judged at the judgment moment. The heating stability of the air conditioner is improved.

Description

Technical Field

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

[0002] When the air conditioner is heating in a low-temperature environment, the heat exchanger in the condensing state can release heat into the room, while the heat exchanger in the evaporating state is prone to frost.

[0003] In the related art, the temperature of the evaporator is generally monitored during the heating process. When the evaporator temperature is detected to be lower than the lower temperature limit, the air conditioner will start the defrost mode. However, the lower temperature limit is generally a parameter obtained in advance. During the test, the operating state and environmental state of the system may deviate from the actual operating state and environmental state of the air conditioner. Therefore, controlling the air conditioner to start the defrost mode based on the relationship between the evaporator temperature and the lower temperature limit may easily cause the air conditioner to defrost without frost, affecting the heating stability of the air conditioner. Summary of the invention

[0004] The main purpose of the present application is to provide a control method of an air conditioner, an air conditioner and a storage medium, aiming to improve the heating stability of the air conditioner.

[0005] To achieve the above object, the present application proposes a method for controlling an air conditioner, the method comprising:

[0006] Controlling the air conditioner to operate in a heating mode, in which the first heat exchanger of the air conditioner is in a condensing state and the second heat exchanger of the air conditioner is in an evaporating state;

[0007] When the air conditioner satisfies a preset condition indicating that the second heat exchanger has a defrosting risk, obtaining a defrosting number, the defrosting number being the number of occurrences when the frost thickness of the second heat exchanger is less than a preset thickness when the defrost mode is started before the current moment;

[0008] The defrost start judgment time is determined according to the defrost times, and at the judgment time it is judged whether the air conditioner starts the defrost mode.

[0009] In one embodiment, the step of determining the defrost start judgment time according to the defrost times and judging whether the air conditioner starts the defrost mode at the judgment time comprises:

[0010] When the defrost times are greater than the preset times, a time which is later than the current time and has a target time interval with the current time is determined as the judgment time, and the air conditioner is controlled to maintain the heating mode until the judgment time is reached, and then it is determined whether the air conditioner starts the defrost mode.

[0011] In one embodiment, the target duration is positively correlated with the number of defrosting times.

[0012] In one embodiment, the step of determining the defrost start judgment time according to the defrost times and judging whether the air conditioner starts the defrost mode at the judgment time comprises:

[0013] When the defrosting times are less than or equal to the preset times, the current time is used as the judging time to judge whether the air conditioner meets the defrosting start condition.

[0014] In one embodiment, when the air conditioner satisfies a preset condition indicating that the second heat exchanger has a defrosting risk, the step of obtaining the number of defrosting times includes:

[0015] When the air conditioner satisfies a preset condition indicating that the second heat exchanger has a defrosting risk, counting the number of times the defrosting mode of the air conditioner running from an initial moment to a current moment satisfies a first condition, and obtaining the number of defrosting times;

[0016] Wherein, the first condition includes that the defrosting time is less than the standard defrosting time.

[0017] In one embodiment, the initial moment includes the moment when the start command of the heating mode is received, or the moment when the defrost time at the end of the defrost mode of the air conditioner before the current moment is greater than the preset defrost time, and the preset defrost time is greater than the standard defrost time.

[0018] In one embodiment, the step of determining whether the air conditioner is in defrost mode at the determination time comprises:

[0019] At the judging time, judging whether the air conditioner meets the defrosting start condition;

[0020] When the defrost start condition is met, controlling the air conditioner to start the defrost mode;

[0021] When the defrost start condition is not met, controlling the air conditioner to maintain the heating mode;

[0022] The defrost start condition includes that a first temperature difference between an ambient temperature of an environment where the air conditioner is located and a temperature of the second heat exchanger is greater than a target temperature difference.

[0023] In one embodiment, before the step of determining whether the air conditioner starts the defrost mode at the determining time, the method further includes:

[0024] When the air conditioner meets the preset condition, the target temperature difference is determined according to the operating frequency of the compressor of the air conditioner, the ambient temperature of the environment where the air conditioner is located, and the temperature of the first heat exchanger.

[0025] In one embodiment, the step of determining the target temperature difference according to the operating frequency, the ambient temperature and the temperature of the first heat exchanger comprises:

[0026] determining a second temperature difference between the temperature of the first heat exchanger and the ambient temperature;

[0027] The target temperature difference is determined according to the operating frequency and the second temperature difference value, the target temperature difference is positively correlated with the operating frequency, and the target temperature difference is negatively correlated with the second temperature difference value.

[0028] In addition, to achieve the above-mentioned purpose, the present application also proposes an air conditioner, which includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the air conditioner control method as described above.

[0029] In addition, to achieve the above-mentioned purpose, the present application also proposes a storage medium, which 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, the steps of the air conditioner control method described above are implemented.

[0030] One or more technical solutions proposed in the present application have at least the following technical effects: when the solution identifies that the second heat exchanger has a defrost risk during the heating operation of the air conditioner, the air conditioner does not directly start the defrost mode, but determines the timing of starting the defrost mode based on the number of frost-free defrosts of the air conditioner before the current moment, thereby achieving that the judgment of the defrost start of the air conditioner can be matched with the actual operating state of the air conditioner in the current environment, which is conducive to improving the accuracy of the defrost start control of the air conditioner, reducing the occurrence of unnecessary defrost start when the frost thickness of the air conditioner is very thin or there is no frost, thereby effectively improving the heating stability of the air conditioner. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0032] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0033] Figure 1 This is a structural schematic diagram of an embodiment of a refrigerant circulation system in an air conditioner of the present application;

[0034] Figure 2 A schematic diagram of the device structure of the hardware operating environment involved in the air conditioner control method in the embodiment of the present application;

[0035] Figure 3 A flow chart of a control method for an air conditioner according to an embodiment of the present invention;

[0036] Figure 4 A flow chart of a second embodiment of the air conditioner control method of the present application is provided.

[0037] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0038] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0039] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0040] The main solution of the embodiment of the present application is: controlling the air conditioner to operate in a heating mode, in which the first heat exchanger of the air conditioner is in a condensing state and the second heat exchanger of the air conditioner is in an evaporating state; obtaining the number of defrost times when the air conditioner satisfies a preset condition indicating that the second heat exchanger has a defrosting risk, the number of defrost times being the number of times the frost thickness of the second heat exchanger is less than a preset thickness when the defrost mode is started before the current moment; determining the judgment time for starting the defrost according to the number of defrost times, and judging at the judgment time whether the air conditioner has started the defrost mode.

[0041] In this embodiment, for the convenience of description, the following description is made with the air conditioner as the execution subject.

[0042] In the related art, the temperature of the evaporator is generally monitored during the heating process. When the evaporator temperature is detected to be lower than the lower temperature limit, the air conditioner will start the defrost mode. However, the lower temperature limit is generally a parameter obtained in advance. During the test, the operating state and environmental state of the system may deviate from the actual operating state and environmental state of the air conditioner. Therefore, controlling the air conditioner to start the defrost mode based on the relationship between the evaporator temperature and the lower temperature limit may easily cause the air conditioner to defrost without frost, affecting the heating stability of the air conditioner.

[0043] The present application provides the above-mentioned solution. When it is identified that the second heat exchanger has a defrost risk during the heating operation of the air conditioner, the air conditioner does not directly start the defrost mode, but determines the timing of starting the defrost mode based on the number of frost-free defrosts of the air conditioner before the current moment. This ensures that the judgment on the start of the defrost of the air conditioner can be matched with the actual operating state of the air conditioner in the current environment, which is beneficial to improving the accuracy of the defrost start control of the air conditioner, reducing the occurrence of unnecessary defrost start when the frost thickness of the air conditioner is very thin or there is no frost, thereby effectively improving the heating stability of the air conditioner.

[0044] The present application provides an air conditioner, which may include a wall-mounted air conditioner, a window air conditioner, a multi-split air conditioner, a ceiling air conditioner, a floor-standing air conditioner, and the like.

[0045] In this embodiment, refer to Figure 1 The air conditioner includes a refrigerant circulation system 200, which includes a compressor 21 and a first heat exchanger 23, a throttling device 24 and a second heat exchanger 25 connected in sequence. When the air conditioner is running, the exhaust port of the compressor 21 is connected to one of the first heat exchanger 23 and the second heat exchanger 25, and the return air port of the compressor 21 is connected to the other of the first heat exchanger 23 and the second heat exchanger 25.

[0046] In this embodiment, the first heat exchanger 23 is disposed indoors, and the second heat exchanger 25 is disposed outdoors.

[0047] In the refrigerant circulation system 200, a first fan 231 is provided corresponding to the first heat exchanger 23, and a second fan 251 is provided corresponding to the second heat exchanger 25. When the first fan 231 is turned on, it can drive the air in the space where the first heat exchanger 23 is located to exchange heat with the first heat exchanger 23. When the second fan 251 is turned on, it can drive the air in the space where the second heat exchanger 25 is located to exchange heat with the second heat exchanger 25.

[0048] In one implementation, the exhaust port of the compressor 21, the first heat exchanger 23, the throttling device 24, the second heat exchanger 25 and the return air port of the compressor 21 are connected in sequence. When the compressor 21 is turned on, the refrigerant discharged from the compressor 21 flows through the first heat exchanger 23, the throttling device 24, the second heat exchanger 25 in sequence and then flows back to the compressor 21, and the first heat exchanger 23 is in a condensing state. Among them, when the throttling device 24 operates at a throttling opening (in a throttling state), the air conditioner is in a heating mode, and the second heat exchanger 25 is in an evaporating state; when the throttling device 24 operates at an opening greater than the throttling opening (in a non-throttling state), the air conditioner is in a defrosting mode, and the second heat exchanger 25 can release heat to melt the frost in its area.

[0049] In another implementation, the air conditioner further includes a reversing component 22 (such as a four-way valve, etc.), the exhaust port of the compressor 21, the return air port of the compressor 21, the first heat exchanger 23 and the second heat exchanger 25 are all connected to the reversing component 22, and the reversing component 22 has a first operating state and a second operating state. When the reversing component 22 operates in the first operating state, the exhaust port of the compressor 21 is connected to the first heat exchanger 23 and the return air port of the compressor 21 is connected to the second heat exchanger 25. When the reversing component 22 operates in the second operating state, the exhaust port of the compressor 21 is connected to the second heat exchanger 25 and the return air port of the compressor 21 is connected to the first heat exchanger 23. The operating modes of the air conditioner through the cooperation of the reversing component 22 and the throttling device 24 include at least the following:

[0050] In the heating mode, the throttling device 24 operates at a throttling opening, and the reversing component 22 operates in the first operating state. When the compressor 21 is turned on, the refrigerant discharged from the compressor 21 flows through the first heat exchanger 23, the throttling device 24 and the second heat exchanger 25 in sequence and then flows back to the compressor 21. The first heat exchanger 23 is in a condensing state, and the second heat exchanger 25 is in an evaporating state. The first heat exchanger 23 can release heat to increase the temperature of the space in which it is located.

[0051] In the cooling mode, the throttling device 24 operates at a throttling opening, and the reversing component 22 operates in the second operating state. When the compressor 21 is turned on, the refrigerant discharged from the compressor 21 flows through the second heat exchanger 25, the throttling device 24 and the first heat exchanger 23 in sequence and then flows back to the compressor 21. The first heat exchanger 23 is in an evaporating state, and the second heat exchanger 25 is in a condensing state. The first heat exchanger 23 can release cold air to reduce the temperature of the space in which it is located.

[0052] In the first defrost mode, the throttling device 24 can operate at an opening greater than the above-mentioned throttling opening (for example, a maximum opening, etc.), and the reversing component 22 operates in the first operating state. When the compressor 21 is turned on, the refrigerant discharged from the compressor 21 flows through the first heat exchanger 23, the throttling device 24 and the second heat exchanger 25 in sequence and then flows back to the compressor 21, the first heat exchanger 23 and the second heat exchanger 25. The first heat exchanger 23 can release heat to increase the temperature of the space where it is located, and the second heat exchanger 25 can release heat to melt the frost in the space where it is located.

[0053] In the second defrost mode, the throttling device 24 operates at a throttling opening, and the reversing component 22 operates in the second operating state. When the compressor 21 is turned on, the refrigerant discharged from the compressor 21 flows through the second heat exchanger 25, the throttling device 24 and the first heat exchanger 23 in sequence and then flows back to the compressor 21. The first heat exchanger 23 is in an evaporating state, and the second heat exchanger 25 is in a condensing state. The second heat exchanger 25 can release heat to melt the frost in the space where it is located.

[0054] Among them, when the air conditioner switches from the heating mode to the first defrost mode, the reversing component 22 does not need to reverse, and the first heat exchanger 23 can maintain heating to the space where it is located; when the air conditioner switches from the heating mode to the second defrost mode, the reversing component 22 needs to reverse, and the defrost heat corresponding to the second defrost mode is greater than the defrost heat corresponding to the first defrost mode.

[0055] Reference Figure 2 The air conditioner further includes a control device 100 , and the refrigerant circulation system 200 is connected to the control device 100 .

[0056] Combination Figure 1 and Figure 2 The air conditioner further includes a first temperature sensor 01 disposed on the first heat exchanger 23 (for example, disposed in the middle of the first heat exchanger 23 ), and the first temperature sensor 01 can detect the temperature of the first heat exchanger 23 .

[0057] Combination Figure 1 and Figure 2 The air conditioner further includes a second temperature sensor 01 disposed on the second heat exchanger 25 (eg, disposed on a refrigerant outlet of the second heat exchanger 25 ), and the second temperature sensor 01 can detect the temperature of the second heat exchanger 25 .

[0058] Combination Figure 1 and Figure 2 The air conditioner further includes an environment detection module 03 disposed in the environment where the air conditioner is located. The environment detection module 03 can be used to detect the environment state parameters (such as at least one of the environment temperature, environment humidity, and environment enthalpy value) of the environment where the air conditioner is located. The environment detection module 03 includes an indoor temperature sensor disposed in the indoor environment and / or an outdoor temperature sensor disposed in the outdoor environment.

[0059] Among them, refer to Figure 2 The control device 100 includes: at least one processor 1001; and a memory 1002 connected to the at least one processor 1001 for communication, 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 so that the at least one processor 1001 can execute the control method of the air conditioner in the following embodiment.

[0060] Reference below Figure 2, which shows a schematic diagram of the structure of the control device 100 suitable for implementing the embodiment of the present application. The air conditioner in the embodiment of the present application may include but is not limited to mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), vehicle-mounted terminals (such as vehicle-mounted navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. Figure 2 The control device 100 shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0061] like Figure 2 As shown, the control device 100 may include a processor 1001 (e.g., a central processing unit, a graphics processor, etc.), which can perform various appropriate actions and processes according to the program stored in the memory 1002, where the program in the memory 1002 may be a program in a read-only memory (ROM) or a program loaded from a storage device to a random access memory (RAM). In the RAM, various programs and data required for the operation of the control device 100 are also stored. The processor 1001 and the memory 1002 (ROM and RAM) are connected to each other through a bus. An input / output (I / O) interface is also connected to the bus. Generally, the following systems can be connected to the I / O interface: input devices such as a touch screen, a touch pad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; output devices such as a liquid crystal display (LCD), a speaker, a vibrator, etc.; storage devices such as a tape, a hard disk, etc.; and communication devices. The communication device can allow the control device 100 to communicate with other devices wirelessly or by wire to exchange data. Although the control device 100 is shown with various systems, 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 instead.

[0062] In particular, according to the embodiments disclosed in the present application, the method flow described in the following embodiments can be implemented as a computer software program. For example, the embodiments disclosed in the present application include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a program code for executing the method 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 the memory 1002. When the computer program is executed by the processor 1001, the above-mentioned functions defined in the control method of the air conditioner in the embodiment disclosed in the present application are executed.

[0063] The air conditioner provided by the present application adopts the control method of the air conditioner in the following embodiment, which can solve the technical problem of how to improve the heating stability of the air conditioner. Compared with the prior art, the beneficial effects of the air conditioner provided by the present application are the same as the beneficial effects of the control method of the air conditioner provided by the following embodiment, and other technical features in the air conditioner are the same as the features disclosed in the following embodiment method, which will not be repeated here.

[0064] It should be noted that the execution subject of this embodiment may be a computing service device with data processing, network communication and program running functions, such as a tablet computer, a personal computer, a mobile phone, etc., or an electronic device capable of realizing the above functions, an air conditioner, etc. The following takes an air conditioner as an example to illustrate this embodiment and the following embodiments.

[0065] Based on this, the embodiment of the present application provides a control method for an air conditioner, referring to Figure 3 , Figure 3 This is a flow chart of a first embodiment of a method for controlling an air conditioner according to the present application.

[0066] In this embodiment, the air conditioner control method includes steps S10 to S30:

[0067] Step S10, controlling the air conditioner to operate in a heating mode, in which the first heat exchanger of the air conditioner is in a condensing state and the second heat exchanger of the air conditioner is in an evaporating state;

[0068] In one implementation, the exhaust port of the compressor, the first heat exchanger, the throttling device, the second heat exchanger and the return air port of the compressor are connected in sequence. When the compressor is turned on, the refrigerant discharged from the compressor flows through the first heat exchanger, the throttling device, the second heat exchanger in sequence and then flows back to the compressor. The throttling device operates at a throttling opening, the first heat exchanger is in a condensing state, and the second heat exchanger is in an evaporating state. At this time, the air conditioner is in heating mode.

[0069] In another implementation, the exhaust port of the compressor, the return air port of the compressor, the first heat exchanger and the second heat exchanger are all connected to the reversing assembly, the throttling device operates at a throttling opening, and the reversing assembly operates in a first operating state. When the compressor is turned on, the refrigerant discharged from the compressor flows through the first heat exchanger, the throttling device and the second heat exchanger in sequence and then flows back to the compressor. The first heat exchanger is in a condensing state, and the second heat exchanger is in an evaporating state. The first heat exchanger can release heat to increase the temperature of the space in which it is located. At this time, the air conditioner is in heating mode.

[0070] Step S20, when the air conditioner satisfies a preset condition indicating that the second heat exchanger has a defrosting risk, obtaining a defrosting number, the defrosting number being the number of occurrences when the frost thickness of the second heat exchanger is less than a preset thickness when the defrost mode is started before the current moment;

[0071] The preset condition is a condition that the state parameter of the air conditioner itself and / or the environmental parameter of the environment in which the air conditioner is located need to reach when the second heat exchanger has a defrosting risk. In this embodiment, the preset condition includes a first target temperature range that the temperature of the second heat exchanger needs to reach, and / or the preset condition may include a second target temperature range that the ambient temperature of the environment in which the air conditioner is located needs to reach.

[0072] The preset thickness is the maximum frost thickness of the second heat exchanger allowed by the heating performance of the air conditioner to reach the target performance. If the frost thickness of the second heat exchanger is less than the preset thickness, it indicates that the heat exchange state of the second heat exchanger is normal and the heating performance of the air conditioner is good; if the frost thickness of the second heat exchanger is greater than or equal to the preset thickness, it indicates that the heat exchange state of the second heat exchanger is abnormal and the heating energy efficiency of the air conditioner is poor. If the frost thickness is less than the preset thickness, it can indicate that there is no frost on the second heat exchanger or that the second heat exchanger is frosted but the thickness is very thin. The number of defrosting times can be considered as the number of times the air conditioner defrosts without frost.

[0073] Before the current moment, when the air conditioner starts the heating mode, the initial value of the statistical number is 0. After each defrost mode is started, it can be analyzed based on the operating status parameters of the air conditioner to determine whether the frost thickness of the second heat exchanger is less than the preset thickness when the defrost mode is started. If the judgment result is that the frost thickness is less than the preset thickness, the statistical number is accumulated by 1. If the judgment result is that the frost thickness is greater than or equal to the preset thickness, the statistical number remains unchanged. If the preset conditions are met, the current statistical number will be used as the defrost number here.

[0074] Among them, whether the frost thickness of the second heat exchanger is less than the preset thickness when the defrost mode is started can be determined based on at least one of the corresponding defrost time, the temperature change parameter of the second heat exchanger in the defrost mode, the temperature difference change value between the temperature of the second heat exchanger in the defrost mode and the ambient temperature, and other parameters.

[0075] Step S30, determining a defrost start judgment time according to the defrost times, and judging whether the air conditioner starts a defrost mode at the judgment time.

[0076] Different defrosting times correspond to different judgment moments, and the judgment moment may be the current moment or a moment after the current moment, that is, different defrosting times have different intervals between the judgment moment and the current moment.

[0077] Among them, the correspondence between the number of defrost times and the interval duration can be preset, and the correspondence can include a mapping relationship or a relational expression or a machine learning model, etc. Based on the correspondence, the interval duration corresponding to the current number of defrost times can be determined, and the interval duration is greater than or equal to 0, and the judgment time can be determined according to the current time and the interval duration. For example, the interval duration can be determined according to the numerical range of the number of defrost times, or the interval duration can be calculated by substituting the number of defrost times into the preset relational expression.

[0078] At the judgment moment, it can be judged whether the air conditioner meets the defrost start condition, and the defrost start condition is the condition that the state parameters of the air conditioner itself and / or the environmental state parameters of the environment in which it is located need to meet when the air conditioner starts the defrost mode.

[0079] The defrost start condition here is set to a different condition from the above-mentioned preset condition. In this embodiment, the preset condition includes the first target temperature range that the temperature of the second heat exchanger needs to reach, and the defrost start condition includes the target temperature difference range that the temperature difference between the temperature of the second heat exchanger and the ambient temperature needs to reach.

[0080] When the determination time is later than the current time, the air conditioner is controlled to maintain the operation in the heating mode until the determination time is reached to determine whether the air conditioner starts the defrost mode.

[0081] If it is determined at the judging moment that the air conditioner meets the defrost start condition, the air conditioner is controlled to start the defrost mode; if it is determined at the judging moment that the air conditioner does not meet the defrost start condition, the air conditioner is controlled to maintain the heating mode.

[0082] After the air conditioner starts the defrosting mode, if the temperature of the second heat exchanger is greater than the preset temperature, the defrosting of the second heat exchanger is considered to be completed, and the process returns to step S10. If the air conditioner maintains the heating mode, the process returns to step S20.

[0083] The present embodiment provides a control method for an air conditioner. When it is identified that the second heat exchanger has a defrost risk during the heating operation of the air conditioner, the air conditioner does not directly start the defrost mode, but determines the timing of starting the defrost mode based on the number of frost-free defrosts of the air conditioner before the current moment, thereby achieving the match between the judgment of the defrost start of the air conditioner and the actual operating state of the air conditioner in the current environment, which is beneficial to improving the accuracy of the defrost start control of the air conditioner, reducing the occurrence of unnecessary defrost start when the frost thickness of the air conditioner is very thin or there is no frost, thereby effectively improving the heating stability of the air conditioner.

[0084] In a feasible implementation, when the number of defrost times is greater than a preset number, a moment that is later than the current moment and has a target time interval with the current moment is determined as the judgment moment, and the air conditioner is controlled to maintain the operation of the heating mode until the judgment moment is reached, and then it is determined whether the air conditioner starts the defrost mode; when the number of defrost times is less than or equal to the preset number, the current moment is used as the judgment moment and it is determined whether the air conditioner meets the defrost start conditions.

[0085] The preset number of times can be a pre-set fixed number of times, or a number determined according to the actual operating conditions of the air conditioner. For example, the preset number of times can be determined according to the ambient temperature of the environment in which the air conditioner is located and / or the operating frequency of the compressor of the air conditioner in the heating mode.

[0086] The target duration may be a preset fixed duration, or may be a parameter value determined according to the actual operation of the air conditioner.

[0087] In this embodiment, the target duration is positively correlated with the number of defrosts, that is, as the number of defrosts increases, the target duration increases. The target duration can be calculated by the number of defrosts, or can be determined according to the numerical range of the number of defrosts. For example, target duration = a*N, a is a preset parameter value, and N is the number of defrosts.

[0088] The corresponding relationship between the number of defrost times and the target duration may be a preset relationship or a relationship obtained according to the current temperature of the second heat exchanger. The lower the temperature of the second heat exchanger, the shorter the target duration corresponding to the number of defrost times.

[0089] When the air conditioner maintains the heating mode, the air conditioner can maintain the heating operation parameters before the preset conditions are met, and also adjust the heating operation parameters to reduce the heating amount of the air conditioner. The parameter adjustment value of the heating operation parameter can be determined based on the relationship between the average defrost time of all defrost modes that meet the first condition before the current moment and the standardized defrost time. The first condition indicates that the frost thickness of the second heat exchanger is less than the preset thickness when the defrost mode is started.

[0090] In this embodiment, when the number of frost-free defrosting of the air conditioner is relatively large, the heating time of the air conditioner is extended when the second heat exchanger has a risk of frosting, that is, the defrosting interval of the air conditioner is extended, which is conducive to reducing the occurrence of subsequent frost-free defrosting of the air conditioner, so that the air conditioner can heat stably, and further improve the heating stability of the air conditioner. When the number of frost-free defrosting of the air conditioner is relatively small, when the second heat exchanger has a risk of frosting, it is immediately determined whether the air conditioner starts defrosting, thereby reducing the occurrence of frost-free defrosting while ensuring that the air conditioner can defrost in time to ensure normal heating.

[0091] In other embodiments, when the defrosting times are less than or equal to the preset times, a time later than the current time and separated from the current time by a preset time length may be used as the judgment time, and the preset time length is less than the target time length.

[0092] In a feasible implementation manner, when the air conditioner satisfies a preset condition indicating that the second heat exchanger has a defrosting risk, the step of obtaining the number of defrosting times includes:

[0093] When the air conditioner satisfies a preset condition indicating that the second heat exchanger has a defrosting risk, the number of times the defrost mode of the air conditioner running from the initial moment to the current moment satisfies the first condition is counted to obtain the defrost number; wherein the first condition includes that the defrost time is less than the standardized defrost time.

[0094] The standardized defrosting time is the shortest time required for the air conditioner to defrost the second heat exchanger when the frost thickness reaches a preset thickness under the rated heating condition.

[0095] The initial moment may be a pre-set fixed moment, or a moment set according to the actual operation of the air conditioner. In this embodiment, the initial moment includes the moment when the start command of the heating mode is received, or the moment when the defrost time is greater than the preset defrost time when the defrost mode of the air conditioner before the current moment ends, and the preset defrost time is greater than the standardized defrost time. Among them, the preset time can be the time required for the air conditioner to defrost the second heat exchanger with a frosting thickness reaching a set thickness under the rated heating condition. The set thickness is greater than the above-mentioned preset thickness, and the defrost time is greater than the preset defrost time, indicating that the second heat exchanger has a high risk of frosting during the heating process of the air conditioner and is prone to thick frost. Therefore, taking this as the starting point to count the number of frost-free defrosting of the air conditioner is conducive to improving the accuracy of the air conditioner defrost start control, and achieving the goal of ensuring the heating performance of the air conditioner while improving the heating stability of the air conditioner.

[0096] In this embodiment, based on the length of the defrost time of the air conditioner in each defrost mode before the current moment, it is possible to accurately characterize whether the air conditioner is in a frost-free defrost situation, thereby further improving the accuracy of the defrost start control and achieving further improvement in heating stability and heating performance.

[0097] In other embodiments, the first condition may also include that a temperature change value of the second heat exchanger in the defrost mode is less than a preset temperature change value.

[0098] Based on any of the above embodiments, in the second embodiment of the present application, the same or similar contents as those in the above embodiments can be referred to the above introduction, and will not be described in detail later. Figure 4 The step of judging whether the air conditioner starts the defrost mode at the judging moment comprises:

[0099] Step S31, determining whether the air conditioner meets a defrost start condition at the determination time, wherein the defrost start condition includes that a first temperature difference between an ambient temperature of an environment where the air conditioner is located and a temperature of the second heat exchanger is greater than a target temperature difference;

[0100] When the defrost start condition is met, step S32 is executed; when the defrost start condition is not met, step S33 is executed.

[0101] The ambient temperature may include an indoor ambient temperature and / or an outdoor ambient temperature. In this embodiment, the ambient temperature is an outdoor ambient temperature.

[0102] The target temperature difference is the minimum temperature difference between the ambient temperature and the temperature of the second heat exchanger that needs to be reached when the frost thickness of the second heat exchanger reaches a preset thickness. The target temperature difference can be a preset fixed temperature difference, or a temperature difference determined according to the actual operation of the air conditioner.

[0103] If the first temperature difference value is greater than the target temperature difference, it indicates that the frost thickness of the second heat exchanger has reached the preset thickness and defrosting needs to be started; if the first temperature difference value is less than or equal to the target temperature difference, it indicates that the frost thickness of the second heat exchanger has not reached the preset thickness and defrosting mode does not need to be started.

[0104] Step S32, controlling the air conditioner to start the defrost mode;

[0105] Step S33, controlling the air conditioner to maintain the heating mode.

[0106] After step S32, the process may return to step S10 when the defrosting end condition is met; after step S33, the process may return to step S20.

[0107] In this embodiment, the first temperature difference between the ambient temperature and the temperature of the second heat exchanger can be used to accurately identify whether the air conditioner needs to start defrosting, thereby further improving the accuracy of the air conditioner defrost start control, and further improving the balance between the air conditioner's heating performance and heating stability.

[0108] In a feasible implementation manner, before the step of determining at the determining time whether the air conditioner starts the defrost mode, the method further includes:

[0109] When the air conditioner meets the preset condition, the target temperature difference is determined according to the operating frequency of the compressor of the air conditioner, the ambient temperature of the environment where the air conditioner is located, and the temperature of the first heat exchanger.

[0110] The operating frequency is the frequency at which the compressor is currently operating.

[0111] The ambient temperature may include indoor ambient temperature and / or outdoor ambient temperature. In this embodiment, the ambient temperature is outdoor ambient temperature.

[0112] The first heat exchanger is in a condensing state, and the temperature of the first heat exchanger is the condensing temperature of the first heat exchanger.

[0113] The correspondence between the operating frequency, ambient temperature and the temperature of the first heat exchanger can be pre-set and can be in the form of a relational expression, a mapping relationship, etc. Based on the correspondence, the target temperature difference can be determined by the current operating frequency, ambient temperature and the temperature of the first heat exchanger.

[0114] In this embodiment, a second temperature difference between the temperature of the first heat exchanger and the ambient temperature is determined; the target temperature difference is determined according to the operating frequency and the second temperature difference, the target temperature difference is positively correlated with the operating frequency, and the target temperature difference is negatively correlated with the second temperature difference.

[0115] In this embodiment, the frequency interval where the operating frequency is located is determined, the temperature difference interval where the second temperature difference value is located is determined, and the target temperature difference is determined according to the frequency interval and the temperature difference interval. The temperature of the first heat exchanger is T2, the ambient temperature is T4, the second temperature difference value is T2-T4, the operating frequency is F, and the ΔT target temperature difference is, then the relationship between the parameters can be shown in the following table:

[0116]

[0117] Among them, M1, M2, M3, and M4 are all critical values ​​of the temperature difference interval, and M1, M2, M3, and M4 increase in sequence; f1, f2, f3, f4, f5, and f6 are all critical values ​​of the frequency interval, and f1, f2, f3, f4, f5, and f6 increase in sequence; a, b, c, d, e, f, g, and h are the target temperature differences corresponding to different intervals, and a, b, c, d, e, f, g, and h increase in sequence.

[0118] In this embodiment, the combination of the operating frequency of the compressor, the ambient temperature, and the discrimination threshold of the first heat exchanger in determining the defrost start condition is conducive to further ensuring that the defrost start control can accurately match the actual operating state of the air conditioner and the environmental conditions of the air conditioner, and effectively improve the accuracy of the defrost start control, thereby further improving the balance between the heating performance and heating stability of the air conditioner. Among them, the second temperature difference value can accurately reflect the heating demand of the air conditioner, and the operating frequency of the compressor can accurately reflect the heating capacity of the air conditioner. Therefore, setting the target temperature difference in combination with the second temperature difference value and the operating frequency of the compressor is conducive to further improving the accuracy of the defrost start control, thereby further improving the balance between the heating performance and heating stability of the air conditioner.

[0119] In other embodiments, a relationship between the temperature of the first heat exchanger, the ambient temperature, the operating frequency and the target temperature difference may be pre-established, and the target temperature difference may be calculated by substituting the temperature of the first heat exchanger, the ambient temperature and the operating frequency into the relationship.

[0120] It should be noted that the above examples are only used to understand the present application and do not constitute a limitation on the control method of the air conditioner of the present application. More simple transformations based on this technical concept are all within the protection scope of the present application.

[0121] The present application provides a computer-readable storage medium having computer-readable program instructions (ie, computer programs) stored thereon, and the computer-readable program instructions are used to execute the control method of the air conditioner in the above-mentioned embodiment.

[0122] The computer-readable storage medium provided in the present application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, systems or devices, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. 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 combination with an instruction execution system, system or device. The program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination of the above.

[0123] The computer-readable storage medium may be included in the air conditioner, or may exist independently without being installed in the air conditioner.

[0124] The computer-readable storage medium carries one or more programs. When the one or more programs are executed by the air conditioner, the air conditioner executes the following process: controlling the air conditioner to operate in a heating mode, in which the first heat exchanger of the air conditioner is in a condensing state and the second heat exchanger of the air conditioner is in an evaporating state; obtaining the number of defrost times when the air conditioner satisfies a preset condition indicating that the second heat exchanger has a defrosting risk, the number of defrost times being the number of times the frost thickness of the second heat exchanger is less than a preset thickness when the defrost mode is started before the current moment; determining a judgment time for starting defrost according to the number of defrost times, and judging whether the air conditioner has started the defrost mode at the judgment time.

[0125] Computer program code for performing the operations of the present application may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0126] The readable storage medium provided in the present application is a computer-readable storage medium, which stores computer-readable program instructions (i.e., computer programs) for executing the above-mentioned air conditioner control method, and can solve the technical problem of how to improve the heating stability of the air conditioner. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in the present application are the same as the beneficial effects of the air conditioner control method provided in the above-mentioned embodiment, and will not be described in detail here.

[0127] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present application. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some implementations as replacements, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0128] It should be understood that the various parts disclosed in the present application can be implemented by hardware, software, firmware or a combination thereof. The modules described in the embodiments of the present application can be implemented by software or by hardware. The name of the module does not constitute a limitation on the unit itself under certain circumstances. In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0129] The above description is only part of the embodiments of the present application, and does not limit the patent scope of the present application. All equivalent structural changes made by using the contents of the present application specification and drawings under the technical concept of the present application, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A method for controlling an air conditioner, characterized in that: The method comprises: Controlling the air conditioner to operate in a heating mode, in which the first heat exchanger of the air conditioner is in a condensing state and the second heat exchanger of the air conditioner is in an evaporating state; When the air conditioner satisfies a preset condition indicating that the second heat exchanger has a defrosting risk, obtaining a defrosting number, the defrosting number being the number of occurrences when the frost thickness of the second heat exchanger is less than a preset thickness when the defrost mode is started before the current moment; The defrost start judgment time is determined according to the defrost times, and at the judgment time it is judged whether the air conditioner starts the defrost mode.

2. The method according to claim 1, characterized in that The step of determining the defrost start judgment time according to the defrost times and judging whether the air conditioner starts the defrost mode at the judgment time comprises: When the defrost times are greater than the preset times, a time which is later than the current time and has a target time interval with the current time is determined as the judgment time, and the air conditioner is controlled to maintain the heating mode until the judgment time is reached, and then it is determined whether the air conditioner starts the defrost mode.

3. The method according to claim 2, characterized in that The target duration is positively correlated with the number of defrosting times.

4. The method according to claim 1, characterized in that The step of determining the defrost start judgment time according to the defrost times and judging whether the air conditioner starts the defrost mode at the judgment time comprises: When the defrosting times are less than or equal to the preset times, the current time is used as the judging time to judge whether the air conditioner meets the defrosting start condition.

5. The method according to claim 1, characterized in that When the air conditioner satisfies a preset condition indicating that the second heat exchanger has a defrosting risk, the step of obtaining the number of defrosting times includes: When the air conditioner satisfies a preset condition indicating that the second heat exchanger has a defrosting risk, counting the number of times the defrosting mode of the air conditioner running from an initial moment to a current moment satisfies a first condition, and obtaining the number of defrosting times; Wherein, the first condition includes that the defrosting time is less than the standard defrosting time.

6. The method according to claim 5, characterized in that The initial moment includes the moment when the start instruction of the heating mode is received, or the moment when the defrost time at the end of the defrost mode of the air conditioner before the current moment is greater than the preset defrost time, and the preset defrost time is greater than the standardized defrost time.

7. The method according to any one of claims 1 to 6, characterized in that The step of judging whether the air conditioner starts the defrost mode at the judging time comprises: At the judging time, judging whether the air conditioner meets the defrosting start condition; When the defrost start condition is met, controlling the air conditioner to start the defrost mode; When the defrost start condition is not met, controlling the air conditioner to maintain the heating mode; The defrost start condition includes that a first temperature difference between an ambient temperature of an environment where the air conditioner is located and a temperature of the second heat exchanger is greater than a target temperature difference.

8. The method according to claim 7, characterized in that Before the step of judging whether the air conditioner starts the defrost mode at the judging time, the method further comprises: When the air conditioner meets the preset condition, the target temperature difference is determined according to the operating frequency of the compressor of the air conditioner, the ambient temperature of the environment where the air conditioner is located, and the temperature of the first heat exchanger.

9. The method according to claim 8, characterized in that The step of determining the target temperature difference according to the operating frequency, the ambient temperature and the temperature of the first heat exchanger comprises: determining a second temperature difference between the temperature of the first heat exchanger and the ambient temperature; The target temperature difference is determined according to the operating frequency and the second temperature difference value, the target temperature difference is positively correlated with the operating frequency, and the target temperature difference is negatively correlated with the second temperature difference value.

10. An air conditioner, characterized in that: The air conditioner comprises: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the air conditioner control method according to any one of claims 1 to 9.

11. 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, the steps of the air conditioner control method according to any one of claims 1 to 9 are implemented.

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