Air conditioner defrosting control method, device, readable storage medium and program product

Abstract

The present invention discloses an air conditioner defrosting control method, device, medium and product. The air conditioner defrosting control method continuously monitors the temperature of the evaporator after the air conditioner enters the heating mode, and then correspondingly controls the opening and closing state of the outdoor fan according to the size of the evaporator temperature (the temperature of the evaporator can be reduced after the outdoor fan is closed), and accumulates the opening duration and / or closing duration of the outdoor fan since entering the heating mode. When the accumulated duration meets the preset conditions, it indicates that the heat exchange efficiency of the air conditioner is too low at this time, and the frosting situation may be relatively serious. Simply controlling the start and stop state of the outdoor fan cannot effectively defrost, so it directly enters the defrosting mode to defrost, so that even when the air conditioner is applied to a scene with relatively high indoor and outdoor environmental temperatures and cannot meet the original automatic defrosting conditions, it can also perform defrosting operations through the above defrosting control logic, so that the air conditioner can automatically defrost when the indoor and outdoor environmental temperatures are relatively high.

Description

Technical Field

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

[0002] With the rapid development of air conditioner technology, various air conditioners have been widely used in people's daily lives. For fixed-frequency air conditioners, currently, when developing fixed-frequency air conditioner products, for the control logic of automatic defrosting in the heating mode, most of the program parameters are considered and set based on the situation of relatively low outdoor ambient temperature. However, in actual applications, in the face of relatively high indoor and outdoor ambient temperatures, the operating parameters of the air conditioner in the heating mode do not meet the preset automatic defrosting conditions. But at this time, it is easy to trigger the high-temperature protection of the indoor unit evaporator, which in turn causes the outdoor unit fan to stop working periodically. During the long-term operation of the air conditioner, such a situation is likely to cause frosting on the outdoor unit. At this time, the air conditioner cannot effectively defrost through the conventional defrosting program, and ultimately the heating effect is greatly reduced. The above situation reflects the problem that existing fixed-frequency air conditioners are difficult to defrost automatically when the indoor and outdoor ambient temperatures are relatively high. Summary of the Invention

[0003] The main purpose of the present invention is to provide an air conditioner defrosting control method, device, computer-readable storage medium, and computer program product, aiming to solve the technical problem that existing fixed-frequency air conditioners are difficult to defrost automatically when the indoor and outdoor ambient temperatures are relatively high.

[0004] To achieve the above object, the present invention provides an air conditioner defrosting control method, and the air conditioner defrosting control method includes:

[0005] Monitoring the temperature of the evaporator in the air conditioner, wherein the air conditioner operates in the heating mode;

[0006] Controlling the opening and closing state of the outdoor fan in the air conditioner according to the magnitude relationship between the temperature and a preset temperature threshold;

[0007] Obtaining the cumulative duration of the outdoor fan in a specified state in the heating mode, wherein the specified state includes an on state and / or an off state;

[0008] When the cumulative duration meets a preset condition, controlling the air conditioner to enter the defrosting mode.

[0009] Optionally, before the step of controlling the air conditioner to enter the defrosting mode when the cumulative duration meets a preset condition, it further includes:

[0010] Judging whether the cumulative duration meets the preset condition;

[0011] If so, execute the step of controlling the air conditioner to enter the defrosting mode.

[0012] Optionally, the cumulative duration includes the cumulative shutdown duration.

[0013] The step of determining whether the cumulative duration meets a preset condition includes:

[0014] Determine whether the cumulative shutdown duration is not less than a preset duration threshold;

[0015] If so, determine that the cumulative duration meets the preset condition;

[0016] If not, determine that the cumulative duration does not meet the preset condition.

[0017] Optionally, the cumulative duration includes the cumulative startup duration and the cumulative shutdown duration.

[0018] The step of determining whether the cumulative duration meets a preset condition includes:

[0019] Determine whether the cumulative shutdown duration is not less than the duration threshold, and whether the cumulative startup duration is less than a preset multiple of the cumulative shutdown duration, where the preset multiple is less than 1;

[0020] If the cumulative shutdown duration is not less than the duration threshold and the cumulative startup duration is less than a preset multiple of the cumulative shutdown duration, determine that the cumulative duration meets the preset condition;

[0021] If the cumulative shutdown duration is less than the duration threshold, and / or the cumulative startup duration is not less than a preset multiple of the cumulative shutdown duration, determine that the cumulative duration does not meet the preset condition.

[0022] Optionally, the preset temperature threshold includes a fan shutdown threshold and a fan startup threshold.

[0023] The step of controlling the opening and closing state of the external fan in the air conditioner according to the magnitude relationship between the temperature and the preset temperature threshold includes:

[0024] When the temperature reaches the fan shutdown threshold, control the external fan to close;

[0025] When the temperature drops from the fan shutdown threshold to the fan startup threshold, control the external fan to start.

[0026] Optionally, an auxiliary throttling device is added in parallel with the main throttling device in the air conditioner, and the main throttling device has been opened.

[0027] After the step of monitoring the temperature of the evaporator in the air conditioner, it further includes:

[0028] Determine whether the temperature reaches a preset throttling opening threshold, where the throttling opening threshold is less than the fan shutdown threshold;

[0029] If so, control the auxiliary throttling device to open.

[0030] Optionally, after the step of controlling the auxiliary throttling device to open, the method further includes:

[0031] Determine whether the temperature is lower than a preset throttling closing threshold, where the throttling closing threshold is less than the throttling opening threshold;

[0032] If so, control the auxiliary throttling device to close, and execute the step of determining whether the temperature reaches the preset throttling opening threshold.

[0033] Optionally, after the step of controlling the auxiliary throttling device to open, the method further includes:

[0034] Determine whether the temperature reaches the fan shutdown threshold;

[0035] If so, execute the step of controlling the external fan to close when the temperature reaches the fan shutdown threshold.

[0036] In addition, to achieve the above object, the present invention further provides an air conditioner defrosting control device, where the air conditioner defrosting control device includes:

[0037] A monitored temperature acquisition module, configured to monitor the temperature of an evaporator in an air conditioner, where the air conditioner operates in a heating mode;

[0038] A fan state control module, configured to control the opening and closing state of an external fan in the air conditioner according to the magnitude relationship between the temperature and a preset temperature threshold;

[0039] An accumulated duration acquisition module, configured to acquire the accumulated duration of the external fan in a specified state in the heating mode, where the specified state includes an on state and / or an off state;

[0040] A defrosting mode entry module, configured to control the air conditioner to enter a defrosting mode when the accumulated duration meets a preset condition.

[0041] Optionally, the defrosting mode entry module includes:

[0042] An accumulated duration judgment unit, configured to judge whether the accumulated duration meets the preset condition;

[0043] A forced defrost trigger unit, configured to, if so, execute the step of controlling the air conditioner to enter the defrosting mode.

[0044] Optionally, the cumulative duration includes the cumulative shutdown duration.

[0045] The cumulative duration determination unit is further configured to:

[0046] Determine whether the cumulative shutdown duration is not less than a preset duration threshold;

[0047] If so, determine that the cumulative duration meets the preset condition;

[0048] If not, determine that the cumulative duration does not meet the preset condition.

[0049] Optionally, the cumulative duration includes the cumulative startup duration and the cumulative shutdown duration.

[0050] Determine whether the cumulative shutdown duration is not less than the duration threshold, and whether the cumulative startup duration is less than a preset multiple of the cumulative shutdown duration, where the preset multiple is less than 1;

[0051] If the cumulative shutdown duration is not less than the duration threshold and the cumulative startup duration is less than a preset multiple of the cumulative shutdown duration, determine that the cumulative duration meets the preset condition;

[0052] If the cumulative shutdown duration is less than the duration threshold, and / or the cumulative startup duration is not less than a preset multiple of the cumulative shutdown duration, determine that the cumulative duration does not meet the preset condition.

[0053] Optionally, the preset temperature threshold includes a fan shutdown threshold and a fan startup threshold.

[0054] The fan state control module includes:

[0055] A fan control shutdown unit, configured to control the external fan to shut down when the temperature reaches the fan shutdown threshold;

[0056] A fan control startup unit, configured to control the external fan to start up when the temperature drops from the fan shutdown threshold to the fan startup threshold.

[0057] Optionally, an auxiliary throttling device parallel to the main throttling device is added to the air conditioner, and the main throttling device is already opened.

[0058] The air conditioner defrost control device further includes:

[0059] An opening temperature judgment module, configured to judge whether the temperature reaches a preset throttling opening threshold, where the throttling opening threshold is less than the fan shutdown threshold;

[0060] A throttling device opening module, configured to, if so, control the auxiliary throttling device to open.

[0061] Optionally, the air conditioner defrosting control device further includes:

[0062] A closing temperature judgment module, configured to judge whether the temperature is lower than a preset throttling closing threshold, where the throttling closing threshold is less than the throttling opening threshold;

[0063] A throttling device closing module, configured to, if so, control the auxiliary throttling device to close, and execute the step of judging whether the temperature reaches the preset throttling opening threshold.

[0064] Optionally, the air conditioner defrosting control device further includes:

[0065] An air blower closing judgment module, configured to judge whether the temperature reaches the air blower closing threshold;

[0066] An air blower control closing module, configured to, if so, execute the step of controlling the external air blower to close when the temperature reaches the air blower closing threshold.

[0067] In addition, to achieve the above object, the present invention further provides an air conditioner, where the air conditioner includes: a memory, a processor, and an air conditioner defrosting control program stored on the memory and executable on the processor. When the air conditioner defrosting control program is executed by the processor, the steps of the air conditioner defrosting control method as described above are implemented.

[0068] In addition, to achieve the above object, the present invention further provides a computer-readable storage medium, on which an air conditioner defrosting control program is stored. When the air conditioner defrosting control program is executed by a processor, the steps of the air conditioner defrosting control method as described above are implemented.

[0069] In addition, to achieve the above object, the present invention further provides a computer program product, including a computer program. When the computer program is executed by a processor, the steps of the air conditioner defrosting control method as described above are implemented.

[0070] The present invention provides an air conditioner defrosting control method, device and computer-readable storage medium. The air conditioner defrosting control method continuously monitors the temperature of the evaporator after the air conditioner enters the heating mode, and then correspondingly controls the opening and closing state of the outdoor fan according to the size of the evaporator temperature (the temperature of the evaporator can be reduced after the outdoor fan is closed), and accumulates the opening duration and / or closing duration of the outdoor fan since it enters the heating mode. When the accumulated duration meets the preset conditions, it indicates that the heat exchange efficiency of the air conditioner is too low at this time, and the frosting situation may be relatively serious. Simply controlling the start and stop state of the outdoor fan cannot effectively defrost, so it directly enters the defrosting mode to defrost. This enables the air conditioner to perform defrosting operations through the above defrosting control logic even when applied to scenarios with relatively high indoor and outdoor environmental temperatures and unable to meet the original automatic defrosting conditions, so that the air conditioner can automatically defrost when the indoor and outdoor environmental temperatures are relatively high, solving the problem that existing fixed-frequency air conditioners are difficult to automatically defrost when the indoor and outdoor environmental temperatures are relatively high. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] Figure 1 is a schematic structural diagram of an air conditioner in the hardware operating environment related to the solution of the embodiment of the present invention;

[0072] Figure 2 is a schematic flowchart of the first embodiment of the air conditioner defrosting control method of the present invention;

[0073] Figure 3 is a schematic structural diagram of a specific system in the third embodiment of the air conditioner defrosting control method of the present invention;

[0074] Figure 4 is a schematic flowchart of a specific embodiment of the air conditioner defrosting control method of the present invention;

[0075] Figure 5 is a schematic diagram of the functional modules of the air conditioner defrosting control device of the present invention.

[0076] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0077] 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.

[0078] As Figure 1 shown, Figure 1 is a schematic structural diagram of an air conditioner in the hardware operating environment related to the solution of the embodiment of the present invention.

[0079] As Figure 1As shown in the figure, the air conditioner may include: a processor 1001, a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Among them, the communication bus 1002 is used to realize the connection and communication between these components. Optionally, the user interface 1003 may include a standard wired interface and a wireless interface. Optionally, the network interface 1004 may include a standard wired interface and a wireless interface (such as a WI-FI interface). The memory 1005 may be a high-speed RAM memory or a stable memory (non-volatile memory). Optionally, the memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0080] Those skilled in the art can understand that Figure 1 the air conditioner structure shown in the figure does not constitute a limitation on the air conditioner, and may include more or fewer components than shown in the figure, or combine certain components, or have different component arrangements.

[0081] Such as Figure 1 As shown in the figure, the memory 1005, as a computer storage medium, may include an operating system, a network communication module, a user interface module, and an air conditioner defrost control program.

[0082] In Figure 1 the air conditioner shown in the figure, the network interface 1004 is mainly used to connect to the background server and perform data communication with the background server; the user interface 1003 is mainly used to connect to the client (user side) and perform data communication with the client; and the processor 1001 may be used to call the program stored in the memory 1005 and execute the operations in the following air conditioner defrost control method.

[0083] Based on the above hardware structure, various embodiments of the air conditioner defrost control method of the present invention are proposed.

[0084] To solve the above technical problems, the present invention provides an air conditioner defrost control method, that is, by continuously monitoring the temperature of the evaporator after the air conditioner enters the heating mode, and then correspondingly controlling the opening and closing state of the outdoor fan according to the size of the evaporator temperature (the temperature of the evaporator can be reduced after the outdoor fan is closed), and accumulating the opening duration and / or closing duration of the outdoor fan since entering the heating mode. When it is detected that the accumulated duration meets the preset conditions, it indicates that the heat exchange efficiency of the air conditioner is too low at this time, and the frosting situation may be relatively serious. Simply controlling the start and stop state of the outdoor fan cannot effectively defrost, so directly enter the defrost mode to perform defrosting, so that even when the air conditioner is applied to a scenario with a relatively high indoor and outdoor ambient temperature and cannot meet the original automatic defrosting conditions, it can perform defrosting operations through the above defrost control logic, so that the air conditioner can automatically defrost when the indoor and outdoor ambient temperature is relatively high, solving the problem that the existing fixed-frequency air conditioner is difficult to automatically defrost when the indoor and outdoor ambient temperature is relatively high.

[0085] Refer to Figure 2 , Figure 2 which is a schematic flow chart of the first embodiment of the air conditioner defrosting control method.

[0086] The first embodiment of the present invention provides an air conditioner defrosting control method, which includes the following steps:

[0087] Step S10, monitor the temperature of the evaporator in the air conditioner, where the air conditioner operates in the heating mode;

[0088] Step S20, control the opening and closing state of the external fan in the air conditioner according to the magnitude relationship between the temperature and a preset temperature threshold;

[0089] In this embodiment, the present invention is applied to an air conditioning system, specifically to the air conditioning system of a fixed-frequency air conditioner. Because currently, when developing fixed-frequency air conditioner products, for the control logic of automatic defrosting in the heating mode, most of its program parameters are considered and set based on the condition of relatively low outdoor ambient temperature. However, in actual applications, in the case of relatively high indoor and outdoor ambient temperatures (such as the maximum operating heating condition), the operating parameters of the air conditioner in the heating mode do not meet the preset automatic defrosting conditions, but at this time, it is easy to trigger the high-temperature protection of the indoor unit evaporator, which in turn causes the outdoor unit fan to stop working periodically. During the long-term operation of the air conditioner, such a situation is likely to cause frosting on the outdoor unit. At this time, the air conditioner cannot effectively defrost through the conventional defrosting program, and ultimately the heating effect is greatly reduced. Therefore, the present invention designs a new defrosting control logic for the specific use scenario of relatively low indoor and outdoor ambient temperatures in combination with the air conditioning system.

[0090] The air conditioning system in this embodiment is composed of components such as a compressor, a four-way valve, an outdoor heat exchanger, a main throttling device, an indoor heat exchanger, and internal and external fans. For the heating mode, when the air conditioner is in heating, the refrigerant is compressed by the compressor into a high-temperature and high-pressure gas, which is sent into the indoor heat exchanger (which is the condenser at this time), liquefies and condenses into a normal-temperature and high-pressure liquid, and at the same time, the indoor fan is used to release heat indoors to increase the indoor temperature. Then the normal-temperature and high-pressure liquid refrigerant is sent to the main throttling device to be decompressed and enters the outdoor heat exchanger (which is the evaporator at this time), evaporates and gasifies into a gas, and at the same time, the outdoor fan is used to absorb heat from the outside (the outdoor air temperature becomes lower), and the gaseous refrigerant enters the compressor again for compression to start the next cycle. In this way, by using the characteristics of the refrigerant liquefying and releasing heat and gasifying and absorbing heat, the heat is transferred from the outside to the inside to increase the indoor temperature.

[0091] The evaporator temperature refers to the temperature of the evaporator collected by the air conditioner in the heating mode. At different times, the temperature of the evaporator may be different. Therefore, the value of the evaporator temperature usually shows a changing state and needs to be tracked.

[0092] The preset temperature threshold refers to the temperature critical value used to determine the specific value of the evaporator temperature. This threshold can be one or multiple, and no specific limitation is made here.

[0093] The outdoor fan refers to the fan of the outdoor unit, which can drive the outdoor air through the heat exchanger to enhance the absorption or release of heat.

[0094] Specifically, the above air-conditioning system is hereinafter referred to as the system. After the air conditioner enters the heating mode, the system can detect the temperature of the evaporator at a short interval each time to track the numerical change of the evaporator temperature in real time. After obtaining the evaporator temperature each time, the system compares it with the preset temperature threshold, and controls the outdoor fan to continue to maintain the on state or to turn it off according to the comparison result. It should be noted that at the beginning when the system enters the heating mode, the outdoor fan is in the on state.

[0095] Step S30: Obtain the cumulative duration of the outdoor fan in the specified state in the heating mode, where the specified state includes the on state and / or the off state;

[0096] In this embodiment, the specified state can specifically be only the on state, only the off state, or include both the on state and the off state.

[0097] The cumulative duration refers to the duration when the outdoor fan is in the on state and / or the off state since the air conditioner enters the heating mode.

[0098] Specifically, taking the specified state including the off state and the on state as an example, the system starts to record the on duration of the outdoor fan since the air conditioner enters the heating mode. Thereafter, if the air conditioner turns the outdoor fan on and off multiple times, the system continuously records and updates its cumulative off duration and cumulative on duration each time the start-stop state of the outdoor fan changes.

[0099] Step S40: When the cumulative duration meets the preset condition, control the air conditioner to enter the defrosting mode.

[0100] In this embodiment, the preset condition refers to a condition for determining whether the heat exchange efficiency of the outdoor heat exchanger in the air conditioner is so low that it is necessary to forcibly enter the defrost mode to effectively defrost based on the value of the cumulative duration. Specifically, different conditions can be set for different specified states. Suppose that when the specified state only includes the on state, the corresponding preset condition can be: setting a corresponding duration threshold for the cumulative on duration of the outdoor fan, so that when the system detects that the cumulative on duration exceeds the duration threshold, the air conditioner is controlled to switch from the heating mode to the defrost mode; when the specified state only includes the off state, the corresponding preset condition can be: setting a corresponding duration threshold for the cumulative off duration of the outdoor fan, so that when the system detects that the cumulative off duration exceeds the duration threshold, the air conditioner is controlled to enter the defrost mode; when the specified state includes the off state and the on state, the corresponding preset condition can be: respectively setting corresponding duration thresholds for the cumulative on duration and the cumulative off duration, and determining whether one of the cumulative off duration and the cumulative on duration exceeds the corresponding duration threshold, or both exceed the corresponding duration threshold, or whether the ratio between the two reaches a certain preset interval, etc., and the above conditions can be combined arbitrarily.

[0101] Specifically, each time the start-stop state of the outdoor fan changes, the system continuously records and updates the cumulative duration, and after each data update, determines whether the latest value of the cumulative duration meets the preset condition. If the system determines that the current cumulative duration meets the above preset condition, the air conditioner is controlled to switch from the heating mode to the defrost mode, and the specific defrost method can be carried out in a conventional manner; if the system determines that the current cumulative duration does not meet the preset condition, the actual value of the cumulative duration is continuously recorded and updated.

[0102] In this embodiment, after the air conditioner enters the heating mode, the temperature of the evaporator is continuously monitored, and then the on-off state of the outdoor fan is correspondingly controlled according to the size of the evaporator temperature (the temperature of the evaporator can be reduced after the outdoor fan is turned off), and the on duration and / or off duration of the outdoor fan since it entered the heating mode is accumulated. When the cumulative duration meets the preset condition, it indicates that the heat exchange efficiency of the air conditioner is too low at this time, and the frosting situation may be relatively serious. Simply controlling the start-stop state of the outdoor fan cannot effectively defrost. Therefore, the defrost mode is directly entered for defrosting, so that even when the air conditioner is applied to a scene with a relatively high indoor and outdoor ambient temperature and cannot meet the original automatic defrosting conditions, the defrost operation can be carried out through the above defrost control logic, so that the air conditioner can also automatically defrost when the indoor and outdoor ambient temperature is relatively high, solving the problem that the existing fixed-frequency air conditioner is difficult to automatically defrost when the indoor and outdoor ambient temperature is relatively high.

[0103] Further, based on the above Figure 2 shown in the first embodiment, a second embodiment of the air conditioner defrost control method of the present invention is proposed. In this embodiment, before step S40, it further includes:

[0104] Step A1, determine whether the cumulative duration meets a preset condition;

[0105] Step A2, if yes, then execute the step of controlling the air conditioner to enter the defrosting mode.

[0106] In this embodiment, the cumulative duration may specifically include one or more of the cumulative shutdown duration and the cumulative startup duration. The preset condition may specifically be set as follows: Set a corresponding duration threshold for the cumulative startup duration of the outdoor fan, so that when the system detects that the cumulative startup duration exceeds the duration threshold, control the air conditioner to switch from the heating mode to the defrosting mode; or set a corresponding duration threshold for the cumulative shutdown duration of the outdoor fan, so that when the system detects that the cumulative shutdown duration exceeds the duration threshold, control the air conditioner to enter the defrosting mode; or set corresponding duration thresholds for the cumulative shutdown duration and the cumulative startup duration respectively, and determine whether one of them exceeds the corresponding duration threshold, or whether both exceed the corresponding duration thresholds, or whether the ratio between them reaches a certain preset range, etc. The above conditions can be combined arbitrarily.

[0107] The system determines whether the currently recorded and updated cumulative duration meets the preset condition. If yes, it indicates that the heat exchange efficiency of the outdoor heat exchanger has been relatively low for a long time at this time, and the frosting condition of the outer heat exchanger may be relatively serious, and it is necessary to take coercive measures to defrost to avoid disturbing the subsequent normal operation of the air conditioner due to frosting. Therefore, the system enters the forced defrosting mode to defrost the outer heat exchanger. If the system determines that the cumulative duration has not yet met the preset condition, continue to record and update the cumulative duration.

[0108] In this embodiment, by entering the forced defrosting mode when the system detects that the cumulative duration meets the preset condition, it is possible to reasonably judge extreme frosting conditions and forcibly defrost when the frosting is serious, so as to adopt an effective and direct defrosting method for serious frosting conditions.

[0109] Further, the cumulative duration includes the cumulative shutdown duration,

[0110] Step A1 includes:

[0111] Step A11, determine whether the cumulative shutdown duration is not less than a preset duration threshold;

[0112] Step A12, if yes, then determine that the cumulative duration meets the preset condition;

[0113] Step A13, if not, then determine that the cumulative duration does not meet the preset condition.

[0114] In this embodiment, the preset condition is set only for the cumulative shutdown duration. The preset duration threshold can be flexibly set according to the actual situation and is usually set to 90 minutes.

[0115] Specifically, taking 90 minutes as an example. The system compares the updated cumulative shutdown duration recorded at this time with a preset duration threshold to determine whether the value of the cumulative shutdown duration at this time is not less than 90 minutes. If the system determines that the cumulative shutdown duration is not less than 90 minutes, it further determines that the cumulative duration meets the preset conditions and can enter the forced defrosting mode; if the system determines that the cumulative shutdown duration is less than 90 minutes, it further determines that the cumulative duration does not meet the preset conditions at this time and there is no need to enter the forced defrosting mode yet.

[0116] In this embodiment, preset conditions are set for the cumulative shutdown duration, so that the severity of the frosting situation can be roughly determined by only recording one parameter, and the forced defrosting mode can be entered when the cumulative shutdown duration reaches a certain value.

[0117] Furthermore, the cumulative duration includes the cumulative startup duration and the cumulative shutdown duration.

[0118] Step A1 includes:

[0119] Step B1, determining whether the cumulative shutdown duration is not less than the duration threshold and whether the cumulative startup duration is less than a preset multiple of the cumulative shutdown duration, where the preset multiple is less than 1;

[0120] Step B2, if the cumulative shutdown duration is not less than the duration threshold and the cumulative startup duration is less than a preset multiple of the cumulative shutdown duration, then it is determined that the cumulative duration meets the preset conditions;

[0121] Step B3, if the cumulative shutdown duration is less than the duration threshold, and / or the cumulative startup duration is not less than a preset multiple of the cumulative shutdown duration, then it is determined that the cumulative duration does not meet the preset conditions.

[0122] In this embodiment, the preset conditions are set for these two parameters, namely the cumulative shutdown duration and the cumulative startup duration. The preset multiple must be less than 1 and can be flexibly set according to the actual situation. Specifically, the range of the preset multiple can be set between 0.5 and 0.6.

[0123] For the system to control the air conditioner to enter the forced defrosting mode, the cumulative duration needs to meet two conditions simultaneously: the first is that the cumulative shutdown duration is greater than the preset duration threshold; the second is that the cumulative startup duration is less than a preset multiple of the cumulative shutdown duration.

[0124] Specifically, taking 90 minutes and 0.5 as examples. If the cumulative running time at this time is 30 minutes and the cumulative shutdown time is 96 minutes, the system will compare 96 minutes with 90 minutes to determine that the cumulative shutdown time is greater than the preset time threshold. At the same time, it will compare 30 minutes with 48 minutes (0.5 * 96 minutes) to determine that the cumulative running time is less than 0.5 times the cumulative shutdown time. When both conditions are met, it indicates that the forced defrosting mode needs to be entered at this time. If the cumulative running time at this time is 50 minutes and the cumulative shutdown time is 96 minutes, the system will compare 96 minutes with 90 minutes to determine that the cumulative shutdown time is greater than the preset time threshold. At the same time, it will compare 50 minutes with 48 minutes (0.5 * 96 minutes) to determine that the cumulative running time is greater than 0.5 times the cumulative shutdown time. Since both conditions are not met simultaneously, it indicates that the forced defrosting mode does not need to be entered at this time.

[0125] In this embodiment, two preset conditions are set for the cumulative shutdown time and the cumulative running time, restricting that the cumulative shutdown time and the cumulative running time can enter the forced defrosting mode only when both conditions are met simultaneously. This makes the determination of extreme situations more accurate and reasonable, reducing the possibility of misjudgment.

[0126] Further, based on the above Figure 2 shown in the first embodiment, a third embodiment of the air conditioner defrosting control method of the present invention is proposed. In this embodiment, the preset temperature threshold includes a fan shutdown threshold and a fan startup threshold, and step S20 includes:

[0127] Step S21, when the temperature reaches the fan shutdown threshold, control the external fan to shut down;

[0128] Step S22, when the temperature drops from the fan shutdown threshold to the fan startup threshold, control the external fan to start.

[0129] In this embodiment, the fan shutdown threshold refers to the temperature threshold at which the external fan needs to be shut down when the evaporator temperature reaches this value. The fan startup threshold refers to the temperature threshold at which the external fan can be restarted when the evaporator temperature drops to this value after the fan is shut down. Both the fan shutdown and startup thresholds can be flexibly set according to the actual situation. However, it should be noted that the fan shutdown threshold must be greater than the fan startup threshold. Therefore, the purpose of setting the fan shutdown threshold and the fan startup threshold is that when the evaporator temperature is too high, the external fan is timely shut down to achieve the purpose of cooling. However, if the external fan is in the shutdown state for a long time, it may affect the normal operation of the air conditioner. Therefore, after achieving the cooling purpose, the external fan needs to be timely started to maintain the normal operation state of the air conditioner.

[0130] Specifically, in actual situations, after the air conditioner enters the heating mode, it may experience multiple processes of turning off and then turning on the outdoor fan. After the system enters the heating mode, it continuously tracks and detects the evaporator temperature in real time. When the evaporator temperature first reaches the fan-off threshold, the system controls the outdoor fan to stop running. At this time, the first on-time duration can be recorded, and the off-time duration starts to be timed. Then, when the evaporator temperature drops due to the stop of the outdoor fan and drops to the fan-on threshold, the system controls the outdoor fan to start running again. At this time, an accumulated off-time duration can be obtained, and at the same time, it is accumulated on the basis of the first on-time duration obtained previously, continuously updating the accumulated on-time duration. In this way, after multiple rounds of on-off stages, and each time a new accumulated duration is recorded and updated, it is determined whether it meets the preset conditions.

[0131] In this embodiment, by setting a step of reducing the evaporator temperature by controlling the outdoor fan to stop running in the initial stage, frosting is avoided as much as possible while maintaining the heating mode in the early stage.

[0132] Further, after step S10, it further includes:

[0133] Step C10 determines whether the temperature reaches a preset throttling opening threshold, where the throttling opening threshold is less than the fan-off threshold;

[0134] Step C20, if so, controls the auxiliary throttling device to open.

[0135] In this embodiment, the throttling opening threshold refers to the evaporator temperature corresponding to controlling the auxiliary throttling device to open, which can be flexibly set according to the actual situation, but the throttling opening threshold needs to be less than the fan-off threshold. This is because the operation of opening the auxiliary throttling device is a pre-operation for controlling the outdoor fan to turn off. In an air-conditioning system without an auxiliary throttling device, the control logic for controlling the opening and closing state of the outdoor fan in the second embodiment can be directly adopted. However, in an air-conditioning system with an auxiliary throttling device, after entering the heating mode, the system can first perform system pressure reduction and temperature reduction adjustment by opening the auxiliary throttling device. When the temperature cannot be effectively reduced after opening, the operation of turning off the outdoor fan needs to be taken to reduce the temperature.

[0136] The throttling device usually consists of a capillary tube and a throttle valve. The throttle valve refers to a fluid control valve, usually an electronic valve, which can control the opening and closing state of the throttling device. The throttling device can play a role in reducing pressure and temperature in the system.

[0137] Specifically, such as Figure 3As shown in the figure, the air conditioner in this embodiment is composed of a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, a solenoid valve 4, a main throttling device 5, an auxiliary throttling device 6, an indoor heat exchanger 7, and other components such as internal and external fans not shown in the figure. In this embodiment, a group of auxiliary throttling devices 6 is added in parallel with the main throttling device 5 (i.e., the above-mentioned auxiliary throttling device) in the original air-conditioning system, and an electronic valve 4 is provided to control its opening and closing, so that the auxiliary throttling device 6 can be opened or closed according to actual needs.

[0138] After entering the heating mode, the system continuously monitors the evaporator temperature (the main throttling device is already open). If the evaporator temperature reaches the throttling opening threshold, it means that the evaporator temperature is relatively high at this time and cooling treatment is required. Then the system controls the solenoid valve to open the auxiliary throttling device. At this time, the two throttling devices are in parallel, the flow rate increases, the system pressure decreases, and the evaporator temperature drops. At this time, there is no need to stop the external fan, and there is no risk of frosting outdoors. If the evaporator temperature has not reached the throttling opening threshold, it means that the high-temperature protection condition of the evaporator has not been reached yet, and there is no need to cool down by opening the auxiliary throttling device, and the evaporator temperature needs to be continuously monitored.

[0139] In this embodiment, by adding a group of auxiliary throttling devices in parallel with the original main throttling device, cooling operation can be carried out based on the auxiliary throttling device in the initial stage. In some non-extreme cases, only opening the auxiliary throttling device can effectively reduce the evaporator temperature, which is applicable to air conditioners that can add auxiliary throttling devices.

[0140] Further, after step C20, it further includes:

[0141] Step C30, determining whether the temperature is lower than a preset throttling closing threshold, where the throttling closing threshold is less than the throttling opening threshold;

[0142] Step C40, if so, controlling the auxiliary throttling device to close, and executing the step of determining whether the temperature reaches the preset throttling opening threshold.

[0143] In this embodiment, the throttling closing threshold refers to the evaporator temperature corresponding to closing the auxiliary throttling device, which can be flexibly set according to actual situations, but the set value must be less than the throttling opening threshold.

[0144] After the system controls the auxiliary throttling device to open and the evaporator temperature decreases, the system continuously monitors the value of the evaporator temperature to determine whether the evaporator temperature has dropped to the throttling closure threshold. If the system detects that the evaporator temperature has dropped to the throttling closure threshold, it means that only the main throttling device is needed to maintain the evaporator temperature at this time, and there is no need to further reduce the evaporator temperature by opening the auxiliary throttling device. Then, the solenoid valve is controlled to close the auxiliary throttling device. If the system detects that the evaporator temperature has not dropped from the throttling opening threshold to the throttling closure threshold, it means that the evaporator temperature still needs to be reduced by opening the auxiliary throttling threshold at this time. Therefore, the open state of the auxiliary throttling device is continued to be maintained.

[0145] In this embodiment, by setting the throttling closure threshold, when the evaporator temperature drops to this threshold, the auxiliary throttling device can be closed to reduce unnecessary resource consumption.

[0146] Further, after step C20, it further includes:

[0147] Step D1, determining whether the temperature has reached the fan shutdown threshold;

[0148] Step D2, if so, execute the step of controlling the external fan to shut down when the temperature reaches the fan shutdown threshold.

[0149] In this embodiment, if due to changes in the ambient temperature or system changes, etc., after the auxiliary throttling device is opened, the parallel connection of the two throttling devices still cannot cause the evaporator temperature to drop but continues to rise, the above control logic for controlling the on / off of the external fan can be directly followed. When the system detects that the evaporator temperature continues to rise, the open state of the auxiliary throttling device is maintained unchanged, and it is continuously determined whether the evaporator temperature has reached the above-mentioned fan shutdown threshold. If the system detects that the evaporator temperature has risen to the fan shutdown threshold, it enters the control logic for controlling the external fan to stop running.

[0150] By combining the control logics of the front and back parts in this embodiment, when the previous cooling control based on the auxiliary throttling device is ineffective, it enters the subsequent external fan control process, so that even in the face of extreme situations, reasonable, effective, and timely cooling and defrosting operations can still be performed on the air conditioner.

[0151] As a specific embodiment, such as Figure 4As shown, after the air conditioner starts to operate in the heating mode, the system continuously monitors the evaporator temperature T2. When it detects that the actual value of T2 is greater than or equal to T2_SET1 (i.e., the above-mentioned throttle opening threshold), it controls the solenoid valve to open to activate the auxiliary throttle device for the purpose of reducing pressure and temperature. Under normal circumstances, after activating the auxiliary throttle device, the actual value of T2 can decrease. The system continuously monitors the value of T2 until it drops to T2_SET2 (i.e., the above-mentioned throttle closing threshold), at which point the solenoid valve is closed to control the auxiliary throttle device to close. In actual applications, due to environmental temperature or system changes, after activating the auxiliary throttle device, the value of T2 may not decrease but instead continue to rise. At this time, when the actual value of T2 is greater than or equal to T2_SET3 (i.e., the above-mentioned outdoor fan closing threshold), the system controls the outdoor fan to stop running. Then the system continues to monitor the actual value of T2. If it detects that the value of T2 drops from T2_SET3 to T2_SET4 (i.e., the above-mentioned fan opening threshold), it controls the outdoor fan to start running again, and then enters the step of determining whether T2 is greater than or equal to T2_SET3 again, repeating this cycle. However, if the value of T2 continues to rise after the outdoor fan stops running, it further determines whether t1 (i.e., the above-mentioned cumulative closing duration) is greater than or equal to 90 minutes and whether t2 (i.e., the above-mentioned cumulative opening duration) is less than 0.5 times of t1. If the system determines that both t1 and t2 meet the above conditions, it enters the forced defrost mode; if the system determines that t1 and / or t2 do not meet the above conditions, it continues to monitor T2.

[0152] As Figure 5 shown, the present invention also provides an air conditioner defrost control device, which includes:

[0153] A monitoring temperature acquisition module 10 for monitoring the temperature of the evaporator in the air conditioner, where the air conditioner operates in the heating mode;

[0154] A fan state control module 20 for controlling the opening and closing state of the outdoor fan in the air conditioner according to the magnitude relationship between the temperature and a preset temperature threshold;

[0155] A cumulative duration acquisition module 30 for acquiring the cumulative duration of the outdoor fan in a specified state in the heating mode, where the specified state includes an on state and / or an off state;

[0156] A defrost mode entry module 40 for controlling the air conditioner to enter the defrost mode when the cumulative duration meets a preset condition.

[0157] The present invention also provides an air conditioner.

[0158] The air conditioner includes a processor, a memory, and an air conditioner defrosting control program stored on the memory and executable on the processor. When the air conditioner defrosting control program is executed by the processor, the steps of the air conditioner defrosting control method described above are implemented.

[0159] Wherein, the method implemented when the air conditioner defrosting control program is executed can refer to each embodiment of the air conditioner defrosting control method of the present invention, and will not be elaborated here.

[0160] The present invention also provides a computer-readable storage medium.

[0161] An air conditioner defrosting control program is stored on the computer-readable storage medium of the present invention. When the air conditioner defrosting control program is executed by a processor, the steps of the air conditioner defrosting control method described above are implemented.

[0162] Wherein, the method implemented when the air conditioner defrosting control program is executed can refer to each embodiment of the air conditioner defrosting control method of the present invention, and will not be elaborated here.

[0163] The present invention also provides a computer program product, including a computer program. When the computer program is executed by a processor, the steps of the air conditioner defrosting control method described above are implemented.

[0164] Wherein, the method implemented when the computer program is executed can refer to each embodiment of the air conditioner defrosting control method of the present invention, and will not be elaborated here.

[0165] It should be noted that in this article, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or system. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or system including the element.

[0166] 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.

[0167] Through the description of the above embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented 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, in essence, or the part that contributes to the prior art can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above and includes several instructions for causing an air conditioner to execute the methods described in various embodiments of the present invention.

[0168] The above are only partial embodiments of the present invention, and thus do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be similarly included in the patent protection scope of the present invention.

Claims

1. An air conditioner defrosting control method, characterized in that, the air conditioner defrosting control method is applied to an air conditioner, the air conditioner includes an evaporator, an external fan, a main throttling device, and an auxiliary throttling device connected in parallel with the main throttling device, and the air conditioner defrosting control method includes: When the main throttling device is already opened, monitor the temperature of the evaporator in the air conditioner, wherein the air conditioner operates in a heating mode; According to the magnitude relationship between the temperature and a preset temperature threshold, control the opening and closing state of the external fan in the air conditioner; Obtain the cumulative duration of the external fan in a specified state in the heating mode, wherein the specified state includes an open state and / or a closed state; When the cumulative duration meets a preset condition, control the air conditioner to enter a defrosting mode; The cumulative duration includes a cumulative opening duration and a cumulative closing duration, The step of judging whether the cumulative duration meets the preset condition includes: Judge whether the cumulative closing duration is not less than a preset duration threshold, and whether the cumulative opening duration is less than a preset multiple of the cumulative closing duration; If the cumulative closing duration is not less than the duration threshold and the cumulative opening duration is less than a preset multiple of the cumulative closing duration, it is determined that the cumulative duration meets the preset condition; If the cumulative closing duration is less than the duration threshold, and / or the cumulative opening duration is not less than a preset multiple of the cumulative closing duration, it is determined that the cumulative duration does not meet the preset condition; wherein, the range of the preset multiple is set between 0.5 and 0.6; After the step of monitoring the temperature of the evaporator in the air conditioner, it further includes: Judge whether the temperature reaches a preset throttling opening threshold; If the temperature reaches the preset throttling opening threshold, control the auxiliary throttling device to open.

2. The air conditioner defrosting control method according to claim 1, characterized in that, the preset temperature threshold includes a fan closing threshold and a fan opening threshold, The step of controlling the opening and closing state of the external fan in the air conditioner according to the magnitude relationship between the temperature and the preset temperature threshold includes: When the temperature reaches the fan closing threshold, control the external fan to close; When the temperature drops from the fan closing threshold to the fan opening threshold, control the external fan to open.

3. The air conditioner defrosting control method according to claim 2, characterized in that, the throttling opening threshold is less than the fan closing threshold.

4. The air conditioner defrosting control method according to claim 2 or 3, characterized in that, After the step of controlling the auxiliary throttling device to open, it further includes: Judge whether the temperature is lower than a preset throttling closing threshold, wherein the throttling closing threshold is less than the throttling opening threshold; If so, control the auxiliary throttling device to close, and execute the step of judging whether the temperature reaches the preset throttling opening threshold.

5. The air conditioner defrosting control method according to claim 2 or 3, characterized in that, After the step of controlling the auxiliary throttling device to open, it further includes: Judge whether the temperature reaches the fan closing threshold; If so, execute the step of controlling the external air conditioner to close when the temperature reaches the air conditioner shutdown threshold.

6. An air conditioner, characterized in that, the air conditioner includes: a memory, a processor, and an air conditioner defrost control program stored on the memory and executable on the processor. When the air conditioner defrost control program is executed by the processor, the steps of the air conditioner defrost control method according to any one of claims 1 to 5 are implemented.

7. A computer-readable storage medium, characterized in that, an air conditioner defrost control program is stored on the computer-readable storage medium. When the air conditioner defrost control program is executed by a processor, the steps of the air conditioner defrost control method according to any one of claims 1 to 5 are implemented.

8. A computer program product, characterized in that, the computer program product includes a computer program. When the computer program is executed by a processor, the steps of the air conditioner defrost control method according to any one of claims 1 to 5 are implemented.

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