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. The method comprises the steps that when defrosting conditions are met in the process that the air conditioner operates in a heating mode, state parameters of the air conditioner are obtained, and the state parameters represent the frosting thickness of the air conditioner; the initial opening degree of a throttling valve of the air conditioner is determined according to the state parameters, and the throttling valve is arranged between an indoor heat exchanger and an outdoor heat exchanger of the air conditioner; and the throttle valve is controlled to operate at the initial opening degree, and the air conditioner is controlled to start a defrosting mode. The defrosting efficiency of the air conditioner is improved.

Description

Technical Field

[0001] The present invention 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] With the continuous development of air-conditioning technology, there are more and more types of refrigerants, among which the new refrigerants (such as R290, etc.) have a greatly reduced charge volume compared to traditional refrigerants (such as R410A or R32, etc.).

[0003] At present, the throttle valve of air conditioners (especially those using new refrigerants) is generally fully open when entering the defrost stage during low-temperature heating operation. This will cause a large amount of liquid refrigerant to flow into and deposit in the outdoor unit. The amount of refrigerant circulating in the system is insufficient, which can easily lead to low defrost efficiency. Summary of the invention

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

[0005] To achieve the above object, the present invention provides a method for controlling an air conditioner, the method comprising the following steps:

[0006] When the defrosting condition is met during the operation of the air conditioner in the heating mode, a state parameter of the air conditioner is obtained, wherein the state parameter indicates the frost thickness of the air conditioner;

[0007] determining an initial opening of a throttle valve of the air conditioner according to the state parameter, wherein the throttle valve is arranged between an indoor heat exchanger and an outdoor heat exchanger of the air conditioner;

[0008] The throttle valve is controlled to operate at the initial opening, and the air conditioner is controlled to start a defrost mode.

[0009] Optionally, the initial opening is negatively correlated with the frost thickness represented by the state parameter.

[0010] Optionally, the step of obtaining the state parameter of the air conditioner includes:

[0011] Acquire the current current of the air conditioner and the maximum current of the air conditioner in the heating mode;

[0012] A ratio of the present current to the maximum current is determined, and the state parameter includes the ratio.

[0013] Optionally, the step of determining the initial opening of the throttle valve of the air conditioner according to the state parameter comprises:

[0014] When the ratio is less than a preset value, determining the first opening as the initial opening;

[0015] When the ratio is not less than the preset value, determining the second opening as the initial opening;

[0016] Wherein, the first opening is smaller than the second opening.

[0017] Optionally, the step of controlling the throttle valve to operate at the initial opening and controlling the air conditioner to start the defrost mode includes:

[0018] Controlling the compressor of the air conditioner to stop, and controlling the throttle valve to operate at the initial opening;

[0019] Controlling the reversing component of the air conditioner to switch to a cooling state;

[0020] The compressor is controlled to start up to start the defrost mode.

[0021] Optionally, after the step of controlling the compressor of the air conditioner to stop and controlling the throttle valve to operate at the initial opening, the method further comprises:

[0022] When the shutdown time of the compressor does not reach the preset time, the outdoor fan corresponding to the outdoor heat exchanger is controlled to remain turned on, and the reversing component is controlled to maintain heating operation;

[0023] When the shutdown time of the compressor reaches a preset time, the outdoor fan is controlled to be turned off and the step of controlling the reversing component of the air conditioner to switch to a cooling state is performed.

[0024] Optionally, the refrigerant charged in the air conditioner is R290 refrigerant.

[0025] Optionally, after the step of controlling the air conditioner to start the defrost mode, the method further comprises:

[0026] In the defrost mode, detecting the refrigerant temperature, the refrigerant temperature being the temperature of the refrigerant flowing into the evaporator or the temperature of the refrigerant flowing out of the throttle valve in the defrost mode;

[0027] The opening of the throttle valve is adjusted according to the refrigerant temperature.

[0028] Optionally, the step of adjusting the opening of the throttle valve according to the refrigerant temperature includes:

[0029] The opening of the throttle valve is adjusted according to the refrigerant temperature and the pour point temperature of the compressor lubricating oil in the air conditioner.

[0030] Optionally, the step of adjusting the opening of the throttle valve according to the refrigerant temperature and the pour point temperature of the compressor lubricating oil in the air conditioner comprises:

[0031] Determining a temperature difference between the refrigerant temperature and the pour point temperature;

[0032] When the temperature difference is less than a preset temperature difference, the throttle valve is controlled to increase its opening.

[0033] When the temperature difference is not less than the preset temperature difference, the throttle valve is controlled to maintain the current opening.

[0034] In addition, in order to achieve the above-mentioned purpose, the present application also proposes an air conditioner, which includes: a memory, a processor, and an air conditioner control program stored in the memory and executable on the processor, and when the air conditioner control program is executed by the processor, the steps of the air conditioner control method as described in any one of the above items are implemented.

[0035] In addition, in order to achieve the above-mentioned purpose, the present application also proposes a storage medium, on which a control program of an air conditioner is stored. When the control program of the air conditioner is executed by a processor, the steps of the control method of the air conditioner as described in any of the above items are implemented.

[0036] The present invention proposes a control method for an air conditioner. When the defrost conditions are met during the refrigeration operation of the air conditioner, the method determines the initial opening of a throttle valve between an indoor and outdoor heat exchanger based on a state parameter characterizing the frost thickness of the air conditioner. When the air conditioner starts the defrost mode, the throttle valve operates at the determined initial opening instead of directly operating at the maximum opening. This can achieve precise control of the amount of liquid return in the defrost startup phase, effectively preventing too much liquid refrigerant from entering the outdoor unit and accumulating in the outdoor unit in the initial stage of defrost, ensuring that a sufficient amount of refrigerant is involved in the circulation during the defrost process, and effectively improving the defrost efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 Schematic diagram of the refrigerant flow path structure in an embodiment of the air conditioner of the present invention;

[0038] Figure 2 A schematic diagram of the hardware structure involved in the operation of an air conditioner according to an embodiment of the present invention;

[0039] Figure 3 A schematic diagram of a flow chart of an embodiment of a method for controlling an air conditioner according to the present invention;

[0040] Figure 4 A flow chart of another embodiment of a method for controlling an air conditioner according to the present invention;

[0041] Figure 5 A flow chart of another embodiment of a method for controlling an air conditioner according to the present invention;

[0042] Figure 6 A timing diagram of the air conditioner components switching between heating and defrosting according to the air conditioner control method embodiment of the present invention;

[0043] Figure 7 The figure is a flow chart of another embodiment of the air conditioner control method of the present invention.

[0044] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0045] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0046] The embodiment of the present invention provides an air conditioner, which includes any type of air conditioner such as a wall-mounted air conditioner, a floor-standing air conditioner, a window air conditioner, a multi-split air conditioner, etc.

[0047] In the embodiment of the present invention, refer to Figure 1 The air conditioner includes a control device 100, a compressor 1, a reversing assembly 2, an outdoor heat exchanger 4, a throttle valve 5, and an indoor heat exchanger 7. An indoor fan 6 is provided corresponding to the indoor heat exchanger 7, and an outdoor fan 3 is provided corresponding to the outdoor heat exchanger 4. The compressor 1, the throttle valve 5, the indoor fan 6, and the outdoor fan 3 are all connected to the control device 100. The throttle valve 5 may be an electronic expansion valve.

[0048] The indoor fan 6 can drive the air in the indoor environment to exchange heat with the indoor heat exchanger 7. The outdoor fan 3 can drive the air in the outdoor environment to exchange heat with the outdoor heat exchanger 4.

[0049] In this embodiment, the amount of refrigerant charged into the air conditioner is less than the preset capacity.

[0050] In this embodiment, the refrigerant charged in the air conditioner is R290 refrigerant. In other embodiments, the refrigerant charged in the air conditioner may also be other types of refrigerants with a charge amount less than the preset capacity.

[0051] The outdoor heat exchanger 4, the throttle valve 5 and the indoor heat exchanger 7 are connected in sequence, and the outdoor heat exchanger 4 and the indoor heat exchanger 7 are respectively connected to the return air port of the compressor 1 and the exhaust port of the compressor 1. Specifically, the exhaust port of the compressor 1, the return air port of the compressor 1, the indoor heat exchanger 7 and the outdoor heat exchanger 4 are all connected to the reversing assembly 2.

[0052] The operating states of the reversing assembly 2 include a heating state and a cooling state. When the reversing assembly 2 operates in the heating state, the exhaust port of the compressor 1 is connected to the indoor heat exchanger 7 and the return air port of the compressor 1 is connected to the outdoor heat exchanger 4; when the reversing assembly 2 operates in the cooling state, the exhaust port of the compressor 1 is connected to the outdoor heat exchanger 4 and the return air port of the compressor 1 is connected to the indoor heat exchanger 7.

[0053] The operating modes of the air conditioner include but are not limited to the following modes:

[0054] 1) Heating mode: the reversing assembly 2 operates in the heating state. The refrigerant discharged from the compressor 1 flows through the indoor heat exchanger 7, the throttle valve 5, and the outdoor heat exchanger 4 in sequence and then flows back to the compressor 1. The indoor heat exchanger 7 is in a condensing state, and the outdoor heat exchanger 4 is in an evaporating state. The indoor fan 6 drives the indoor air to exchange heat with the indoor heat exchanger 7, and the outdoor fan 3 drives the outdoor air to exchange heat with the outdoor heat exchanger 4. The air temperature in the indoor environment increases.

[0055] 2) In cooling mode, the reversing component 2 operates in a cooling state, and the refrigerant discharged from the compressor 1 flows through the outdoor heat exchanger 4, the throttle valve 5, and the indoor heat exchanger 7 in sequence and then flows back to the compressor 1. The indoor heat exchanger 7 is in an evaporating state, and the outdoor heat exchanger 4 is in a condensing state. The indoor fan 6 drives the indoor air to exchange heat with the indoor heat exchanger 7, and the outdoor fan 3 drives the outdoor air to exchange heat with the outdoor heat exchanger 4, wherein the air temperature in the indoor environment is reduced.

[0056] 3) In defrost mode, the reversing component 2 operates in a refrigeration state, the refrigerant discharged from the compressor 1 flows through the outdoor heat exchanger 4, the throttle valve 5, and the indoor heat exchanger 7 in sequence and then flows back to the compressor 1, the indoor heat exchanger 7 is in an evaporating state, the outdoor heat exchanger 4 is in a condensing state, the indoor fan 6 stops, and the outdoor fan 3 stops or runs at a low speed. The heat emitted by the refrigerant in the outdoor heat exchanger 4 melts the frost in the outdoor heat exchanger 4 and the space where it is located.

[0057] Further, see Figure 1 and Figure 2 The air conditioner further comprises a temperature sensor 10, which is arranged between the indoor heat exchanger 7 and the throttle valve 5. The temperature sensor 10 is connected to the control device 100.

[0058] Further, see Figure 2 The air conditioner may further include a current detection module 02, which may be built into the control device 100 or may be independently provided from the control device 100. The current detection module 02 is electrically connected to the main circuit of the air conditioner to detect the electrical parameters of the entire air conditioner.

[0059] In the embodiment of the present invention, refer to Figure 2The control device 100 of the air conditioner includes: a processor 1001, such as a CPU, a memory 1002, and a timer 1003. Among them, these components are connected and communicated through a communication bus. The memory 1002 can be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. The memory 1002 can also be a storage device independent of the aforementioned processor 1001.

[0060] Those skilled in the art will understand that Figure 2 The device structure shown in the figure does not constitute a limitation of the device, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0061] like Figure 2 As shown, the memory 1002 as a computer storage medium may include a control program for the air conditioner.

[0062] exist Figure 2 In the device shown, the processor 1001 can be used to call the air conditioner control program stored in the memory 1002 and execute the relevant steps of the air conditioner control method in the following embodiments.

[0063] The embodiment of the present invention further provides a control method of an air conditioner, which is applied to the above-mentioned air conditioner.

[0064] Reference Figure 3 , an embodiment of a control method of an air conditioner of the present application is proposed. In this embodiment, the control method of the air conditioner includes:

[0065] Step S10, when the air conditioner meets the defrosting condition during the operation of the heating mode, obtaining a state parameter of the air conditioner, wherein the state parameter indicates the frost thickness of the air conditioner;

[0066] When the air conditioner is operating in heating mode, the reversing component operates in heating state, the refrigerant discharged from the compressor flows through the indoor heat exchanger, the throttle valve, and the outdoor heat exchanger in sequence and then flows back to the compressor, the indoor heat exchanger is in condensing state, the outdoor heat exchanger is in evaporating state, the indoor fan drives the indoor air to exchange heat with the indoor heat exchanger, and the outdoor fan drives the outdoor air to exchange heat with the outdoor heat exchanger, wherein the air temperature in the indoor environment rises.

[0067] When the air conditioner is running in heating mode, the outdoor heat exchanger is in an evaporating state and absorbs heat. When the outdoor ambient temperature is low, the water vapor in the air will condense into frost on the surface of the outdoor heat exchanger or even the space where it is located. In the heating mode, the state parameters of the air conditioner itself (such as the outdoor heat exchanger temperature, etc.) and / or the environmental parameters of the environment where the air conditioner is located (such as the outdoor ambient temperature and / or the outdoor ambient humidity, etc.) are monitored, and based on the monitored parameters, it is determined whether the defrosting conditions are met. When the defrosting conditions are met during the heating operation of the air conditioner, it indicates that frost has formed on the surface of the outdoor heat exchanger, and the air conditioner needs to start the defrosting mode to melt the frost. For example, when the outdoor heat exchanger temperature is lower than the preset temperature, it can be considered that the air conditioner meets the defrosting conditions.

[0068] The state parameters here may include the operating parameters of the air conditioner itself and / or the environmental parameters of the environment where the air conditioner is located, etc. The state parameters may include but are not limited to at least one of the following parameters: the whole machine electrical parameters of the air conditioner (whole machine current or whole machine electrical power, etc.), the outdoor heat exchanger temperature, the outdoor environmental parameters (ambient temperature and / or humidity), etc.

[0069] Step S20, determining an initial opening of a throttle valve of the air conditioner according to the state parameter, wherein the throttle valve is arranged between an indoor heat exchanger and an outdoor heat exchanger of the air conditioner;

[0070] Different state parameters correspond to different initial openings. In this embodiment, the initial opening is negatively correlated with the frosting thickness represented by the state parameter. That is, the thicker the frosting thickness, the smaller the initial opening; the thinner the frosting thickness, the larger the initial opening. Here, the initial opening and the frosting thickness represented by the state parameter may be linearly or nonlinearly negatively correlated.

[0071] Specifically, a correspondence between the state parameter and the initial opening can be established in advance, and the correspondence can include a calculation formula, a mapping table, etc. Based on the correspondence, the initial opening corresponding to the current state parameter can be determined. For example, the initial opening is calculated by substituting the state parameter into a preset formula. For another example, the initial opening is obtained by querying a preset mapping table through the state parameter. For another example, the parameter interval in which the state parameter is located is determined, and the preset opening associated with the parameter interval is determined as the initial opening, and so on.

[0072] The corresponding relationship between the state parameter and the initial opening degree may be a preset fixed relationship or a relationship determined according to the actual operation of the air conditioner. For example, the continuous operation time and outdoor ambient temperature in the heating mode before the air conditioner meets the defrosting condition may be obtained, and the target corresponding relationship between the state parameter and the initial opening degree may be determined based on the operation time and the outdoor ambient temperature. Different operation time and different outdoor ambient temperatures correspond to different target corresponding relationships, and the initial opening degree corresponding to the current state parameter may be determined based on the target corresponding relationship.

[0073] Step S30, controlling the throttle valve to operate at the initial opening, and controlling the air conditioner to start a defrost mode.

[0074] The defrost mode is started during the operation of the throttle valve at the initial throttling opening. In this embodiment, when the air conditioner is in the defrost mode, the reversing component is operated in the cooling state, and the reversing component of the air conditioner can be controlled to switch from the heating state to the cooling state. In the defrost mode, the outdoor heat exchanger is in a condensing state to release heat to melt the frost on the surface of the outdoor heat exchanger and the space where it is located.

[0075] A control method for an air conditioner is proposed in an embodiment of the present invention. When the defrost conditions are met during the refrigeration operation of the air conditioner, the method determines the initial opening of a throttle valve between indoor and outdoor heat exchangers based on a state parameter characterizing the frost thickness of the air conditioner. When the air conditioner starts the defrost mode, the throttle valve operates at the determined initial opening instead of directly operating at the maximum opening. This can achieve precise control of the amount of liquid return in the defrost startup phase, effectively preventing too much liquid refrigerant from entering the outdoor unit and accumulating in the outdoor unit in the initial stage of defrost, ensuring that a sufficient amount of refrigerant is involved in the circulation during the defrost process, and effectively improving the defrost efficiency.

[0076] In other embodiments, as the frost thickness represented by the state parameter increases, the initial opening degree may first decrease and then increase.

[0077] Furthermore, based on the above embodiments, another embodiment of the control method of the air conditioner of the present application is proposed.

[0078] In this embodiment, refer to Figure 4 , step S10 comprises:

[0079] Step S11, when the air conditioner meets the defrost condition during operation in the heating mode, obtain the current current of the air conditioner and the maximum current of the air conditioner in the heating mode, determine the ratio of the current current to the maximum current, and the state parameter includes the ratio.

[0080] The current current and the maximum current of the air conditioner are both detected by the current detection module.

[0081] After the air conditioner starts the heating mode, the whole machine current of the air conditioner can be detected at set intervals to obtain at least two whole machine currents, and the maximum value of all the whole machine currents detected in the heating mode is used as the maximum current here.

[0082] The current value currently detected by the current detection module is obtained as the current current.

[0083] In this embodiment, as the frost on the air conditioner continues to intensify, the overall current of the air conditioner will gradually decrease. The maximum current during the heating process can reflect the state of the air conditioner when it is not frosted. Based on this, the current current and the maximum current can accurately reflect the frost thickness of the air conditioner. The ratio is used to determine the initial opening of the throttle valve, which is beneficial to improve the accuracy of the throttle valve opening control when defrosting is started, thereby further improving the defrosting efficiency.

[0084] In other embodiments, the correction ratio can be used as the state parameter, or the difference between the current current and the maximum current can be used as the state parameter here, or the state parameter here can be determined based on the current power of the air conditioner and the maximum power in the heating mode, and so on.

[0085] Further, see Figure 4 Based on the above step S11, step S20 includes:

[0086] Step S21, when the ratio is less than a preset value, determining the first opening as the initial opening;

[0087] Step S22, when the ratio is not less than the preset value, determining the second opening as the initial opening; wherein the first opening is less than the second opening.

[0088] It should be noted that the execution order of step S21 and step S22 is not specifically limited.

[0089] The preset value is a critical value for distinguishing the thickness of frost on the air conditioner. If the ratio is less than the preset value, it indicates that the frost is thicker; if the ratio is not less than the preset value, it indicates that the frost is thinner.

[0090] In this embodiment, when the frost thickness is thicker, the throttle valve starts defrosting when it runs at a smaller initial opening, and when the frost thickness is thinner, the throttle valve starts defrosting when it runs at a larger initial opening. Based on this, it is beneficial to accurately control the system return liquid volume in the defrost startup phase, thereby effectively reducing the system exhaust resistance during defrosting while ensuring that a sufficient amount of refrigerant participates in the circulation of the defrost process, so as to further improve the defrost efficiency.

[0091] Further, based on any of the above embodiments, another embodiment of the control method of the air conditioner of the present application is proposed. Figure 5 , the step S30 comprises:

[0092] Step S31, controlling the compressor of the air conditioner to stop, and controlling the throttle valve to operate at the initial opening;

[0093] While controlling the compressor to shut down, the throttle valve is controlled to adjust from the current opening to the initial opening and maintain operation at the initial opening.

[0094] During this process, the reversing component is controlled to maintain the heating state.

[0095] Step S32, controlling the reversing component of the air conditioner to switch to a cooling state;

[0096] Step S33, controlling the compressor to start up to start the defrost mode.

[0097] In this embodiment, after the compressor is shut down, the throttle valve is first adjusted to the initial opening, and then the reversing component is controlled to switch the operating state. This is beneficial for accurately adjusting the amount of refrigerant circulating in the system to the amount of refrigerant that meets the defrosting requirements and then switching the refrigerant flow direction, which is beneficial for improving the efficiency and accuracy of the adjustment, thereby further improving the defrosting efficiency of the subsequent defrosting process.

[0098] Furthermore, in the present embodiment, after the steps of controlling the compressor of the air conditioner to stop and controlling the throttle valve to operate at the initial opening, the step also includes: when the shutdown time of the compressor reaches a preset time, controlling the outdoor fan corresponding to the outdoor heat exchanger to turn off and executing the step of controlling the reversing component of the air conditioner to switch to a cooling state; when the shutdown time of the compressor does not reach the preset time, controlling the outdoor fan corresponding to the outdoor heat exchanger to remain on, and controlling the reversing component to maintain heating state operation.

[0099] For details on the operation of the compressor, throttle valve, outdoor fan, and reversing assembly, please refer to Figure 6 , Figure 6 The timing control diagram of each component when switching between the heating mode and the defrost mode involved in the present embodiment is shown in FIG. 1 , wherein T1 is the moment when the defrost condition is met in the heating mode, T2 is the moment when the defrost mode is started, and T3 is the moment when the exit condition is met in the defrost mode.

[0100] In this embodiment, the reversing component delays reversing and the outdoor fan is delayed in shutting down, which is beneficial to outdoor comfort on the one hand, and is beneficial to reducing the proportion of liquid refrigerant through heat exchange in the outdoor heat exchanger on the other hand, thereby further avoiding excessive accumulation of liquid refrigerant in the outdoor heat exchanger, so as to further improve the defrosting efficiency.

[0101] Furthermore, in this embodiment, after controlling the outdoor fan to be turned off and controlling the reversing component to switch to the cooling state, the compressor can be controlled to maintain the off state, and the throttle valve can be controlled to maintain operation at the initial opening until the compressor shutdown time reaches the target time, and the step of controlling the compressor to start the defrost mode is executed, and the target time here is greater than the above-mentioned preset time.

[0102] Further, based on any of the above embodiments, another embodiment of the control method of the air conditioner of the present application is proposed. Figure 7, after step S30, further comprising:

[0103] Step S40, in the defrost mode, detecting the refrigerant temperature, wherein the refrigerant temperature is the temperature of the refrigerant flowing into the evaporator or the temperature of the refrigerant flowing out of the throttle valve in the defrost mode;

[0104] The refrigerant temperature here is specifically obtained by acquiring the data detected by the above-mentioned temperature sensor.

[0105] In the defrost mode, the indoor heat exchanger is in an evaporating state, so the temperature of the refrigerant flowing into the indoor heat exchanger can be detected as the refrigerant temperature here.

[0106] Step S50, adjusting the opening of the throttle valve according to the refrigerant temperature.

[0107] Different refrigerant temperatures correspond to different throttle valve opening adjustment methods, and the adjustment methods include increasing the opening, decreasing the opening, or maintaining the current opening.

[0108] In one embodiment, an opening adjustment parameter may be determined according to the temperature range of the refrigerant temperature, and the throttle valve may be controlled to adjust its opening according to the opening adjustment parameter.

[0109] In another embodiment, the opening adjustment parameter can be determined according to the quantitative relationship or size relationship between the refrigerant temperature and the temperature threshold, and the throttle valve can be controlled to adjust the opening according to the opening adjustment parameter. The temperature threshold here can be a preset fixed value or a value determined according to the actual operation of the system.

[0110] Furthermore, after step S50, the system may return to step S40 at a preset interval until the air conditioner meets the exit condition of the defrost mode. The exit condition includes that the defrost time reaches a preset time or the temperature of the outdoor heat exchanger is greater than a preset temperature, etc.

[0111] In this embodiment, the refrigerant temperature after the throttle valve is throttled during the defrost process can accurately reflect the oil blockage risk of the system. The opening of the throttle valve can be adjusted according to the refrigerant temperature after the throttle valve is throttled, which is beneficial to avoid oil blockage caused by the precipitation of lubricating oil in the refrigerant during the defrost process, thereby effectively improving the defrost efficiency and the operational reliability of the defrost process.

[0112] Furthermore, in this embodiment, the opening of the throttle valve is adjusted according to the refrigerant temperature and the pour point temperature of the compressor lubricating oil in the air conditioner.

[0113] The opening of the throttle valve is adjusted according to the magnitude relationship or quantitative relationship between the refrigerant temperature and the pour point temperature. Alternatively, the refrigerant temperature and the pour point temperature can be substituted into a preset formula to calculate an opening adjustment parameter, and the opening of the throttle valve is adjusted according to the opening adjustment parameter.

[0114] In this embodiment, the temperature difference between the refrigerant temperature and the pour point temperature is determined; when the temperature difference is less than a preset temperature difference, the throttle valve is controlled to increase its opening; when the temperature difference is not less than the preset temperature difference, the throttle valve is controlled to maintain its current opening.

[0115] The preset temperature difference is used to distinguish whether the system has the risk of oil blockage. The preset temperature difference can be a preset fixed value, or a value determined according to the actual operation of the system, for example, it can be determined according to the initial opening, defrosting time, and the temperature of the indoor heat exchanger. In this embodiment, the preset temperature difference can range from 1 to 10°C.

[0116] If the temperature difference value is less than the preset temperature difference value, it indicates that the refrigerant temperature is too low and there is a risk of oil blockage; if the temperature difference value is not less than the preset temperature difference value, it indicates that the refrigerant temperature is appropriate and there is no risk of oil blockage.

[0117] The opening adjustment value during the process of increasing the throttle valve opening can be a pre-set fixed value, or it can be determined according to the actual operating conditions of the air conditioner. For example, the opening adjustment value can be determined based on the temperature difference between the refrigerant temperature and the pour point temperature, the temperature of the outdoor heat exchanger, the current frequency of the compressor, and the number of times the throttle valve opening is increased in the defrost mode, and the opening is increased according to the determined opening adjustment value.

[0118] In this embodiment, combining the refrigerant temperature and the pour point temperature can more accurately reflect the risk of lubricating oil precipitation. Therefore, adjusting the opening of the throttle valve in combination with these two temperatures (especially the temperature difference between the two temperatures) is beneficial to ensuring the defrosting efficiency while further improving the system operation reliability.

[0119] In addition, an embodiment of the present invention further proposes a storage medium, on which a control program for an air conditioner is stored. When the control program for the air conditioner is executed by a processor, the relevant steps of any embodiment of the control method for the air conditioner are implemented.

[0120] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

[0121] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0122] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes a number of instructions for a terminal device (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in each embodiment of the present invention.

[0123] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for controlling an air conditioner, characterized in that: The control method of the air conditioner comprises the following steps: When the defrosting condition is met during the operation of the air conditioner in the heating mode, a state parameter of the air conditioner is obtained, wherein the state parameter indicates the frost thickness of the air conditioner; determining an initial opening of a throttle valve of the air conditioner according to the state parameter, wherein the throttle valve is arranged between an indoor heat exchanger and an outdoor heat exchanger of the air conditioner; The throttle valve is controlled to operate at the initial opening, and the air conditioner is controlled to start a defrost mode.

2. The air conditioner control method according to claim 1, characterized in that: The initial opening degree is negatively correlated with the frost thickness represented by the state parameter.

3. The air conditioner control method according to claim 1, characterized in that: The step of obtaining the state parameters of the air conditioner comprises: Acquire the current current of the air conditioner and the maximum current of the air conditioner in the heating mode; A ratio of the present current to the maximum current is determined, and the state parameter includes the ratio.

4. The air conditioner control method according to claim 3, characterized in that: The step of determining the initial opening of the throttle valve of the air conditioner according to the state parameter comprises: When the ratio is less than a preset value, determining the first opening as the initial opening; When the ratio is not less than the preset value, determining the second opening as the initial opening; Wherein, the first opening is smaller than the second opening.

5. The air conditioner control method according to claim 1, characterized in that: The step of controlling the throttle valve to operate at the initial opening and controlling the air conditioner to start the defrost mode comprises: Controlling the compressor of the air conditioner to stop, and controlling the throttle valve to operate at the initial opening; Controlling the reversing component of the air conditioner to switch to a cooling state; The compressor is controlled to start up to start the defrost mode.

6. The control method of the air conditioner according to claim 5, characterized in that: After the steps of controlling the compressor of the air conditioner to stop and controlling the throttle valve to operate at the initial opening, the method further includes: When the shutdown time of the compressor does not reach the preset time, the outdoor fan corresponding to the outdoor heat exchanger is controlled to remain turned on, and the reversing component is controlled to maintain heating operation; When the shutdown time of the compressor reaches a preset time, the outdoor fan is controlled to be turned off and the step of controlling the reversing component of the air conditioner to switch to a cooling state is performed.

7. The air conditioner control method according to claim 1, characterized in that: The refrigerant filled in the air conditioner is R290 refrigerant.

8. The method for controlling an air conditioner according to any one of claims 1 to 7, characterized in that: After the step of controlling the air conditioner to start the defrost mode, the method further includes: In the defrost mode, detecting the refrigerant temperature, the refrigerant temperature being the temperature of the refrigerant flowing into the evaporator or the temperature of the refrigerant flowing out of the throttle valve in the defrost mode; The opening of the throttle valve is adjusted according to the refrigerant temperature.

9. The air conditioner control method according to claim 8, characterized in that: The step of adjusting the opening of the throttle valve according to the refrigerant temperature comprises: The opening of the throttle valve is adjusted according to the refrigerant temperature and the pour point temperature of the compressor lubricating oil in the air conditioner.

10. The air conditioner control method according to claim 9, characterized in that: The step of adjusting the opening of the throttle valve according to the refrigerant temperature and the pour point temperature of the compressor lubricating oil in the air conditioner comprises: Determining a temperature difference between the refrigerant temperature and the pour point temperature; When the temperature difference is less than a preset temperature difference, controlling the throttle valve to increase its opening; When the temperature difference is not less than the preset temperature difference, the throttle valve is controlled to maintain the current opening.

11. An air conditioner, characterized in that: The air conditioner comprises: a memory, a processor and a control program of the air conditioner stored in the memory and executable on the processor, wherein the control program of the air conditioner implements the steps of the control method of the air conditioner as described in any one of claims 1 to 10 when executed by the processor.

12. A storage medium, characterized in that: The storage medium stores a control program of the air conditioner, and when the control program of the air conditioner is executed by the processor, the steps of the control method of the air conditioner according to any one of claims 1 to 10 are implemented.

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