A defrosting control method, device, system and air conditioner for air conditioner

Abstract

The present application provides a defrosting control method, device, system and air conditioner for an air conditioner. The air conditioner includes an indoor unit and an outdoor unit, and the method includes: obtaining the degree of supercooling of the indoor unit in a target time period; determining the rate of change of the degree of supercooling of the indoor unit according to the degree of supercooling of the indoor unit in the target time period; when the rate of change of the degree of supercooling of the indoor unit is greater than the threshold value of the rate of change of the degree of supercooling, controlling the outdoor unit to defrost. When the air conditioner is in heating operation, the method reflects the influence of frost on the performance of the air conditioner based on the change of the degree of supercooling of the indoor unit, and controls the outdoor unit to defrost, thereby accurately grasping the timing of entering the defrosting process to improve the user experience.

Description

Technical Field

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

[0002] As the demand for temperature control continues to increase, air conditioners came into being. Air conditioners, also known as air conditioners, are devices that use artificial means to adjust and control the temperature, humidity, flow rate and other parameters of the ambient air in a building or structure.

[0003] When the air conditioner is running in heating mode, if the outdoor ambient temperature is low, the moisture in the air will easily condense into frost on the outdoor unit of the air conditioner, which is called frosting. As the air conditioner runs longer, the thickness of the frost on the outdoor unit will also increase, causing the performance of the outdoor unit heat exchanger to decline, affecting the heating effect of the air conditioner. Therefore, the air conditioner needs to be defrosted when the frost layer is thick.

[0004] Normally, the air conditioner control system determines whether to enter the defrost process based on the outdoor ambient temperature, the accumulated heating time since the last defrost, and the outdoor unit condenser coil temperature. However, the above method may enter the defrost process when there is no frost or the frost layer is not thick, or enter the defrost process only when the frost layer is too thick, thereby reducing the heating capacity of the air conditioner and affecting the user experience. Summary of the invention

[0005] The present application provides a defrosting control method for an air conditioner, which can accurately grasp the timing of entering the defrosting process when the air conditioner is in heating operation, thereby improving the user experience. The present application also provides a device, a system and an air conditioner corresponding to the above method.

[0006] In a first aspect, the present application provides a defrost control method for an air conditioner. The air conditioner includes an indoor unit and an outdoor unit, and the method includes:

[0007] Obtaining the degree of supercooling of the indoor unit in a target time period;

[0008] Determining a supercooling degree change rate of the indoor unit according to the supercooling degree of the indoor unit in a target time period;

[0009] When the supercooling degree change rate of the indoor unit is greater than the supercooling degree change rate threshold, the outdoor unit is controlled to perform defrosting.

[0010] In some possible implementations, determining the supercooling degree change rate of the indoor unit according to the supercooling degree of the indoor unit in the target time period includes:

[0011] Determining, according to the supercooling degree of the indoor unit in the target time period, a first time when the supercooling degree of the indoor unit reaches a first preset value and a second time when the supercooling degree of the indoor unit reaches a second preset value;

[0012] The supercooling degree change rate of the indoor unit is determined according to the first preset value, the second preset value, the first moment and the second moment.

[0013] In some possible implementations, obtaining the degree of supercooling of the indoor unit in the target time period includes:

[0014] When the opening degree of the electronic expansion valve of the indoor unit is greater than the opening degree threshold, the supercooling degree of the indoor unit in the target time period is obtained.

[0015] In some possible implementations, the method further includes:

[0016] Obtaining the degree of supercooling of the outdoor unit;

[0017] When the degree of supercooling of the outdoor unit meets the defrosting stop condition, the outdoor unit is controlled to stop defrosting.

[0018] In some possible implementations, before obtaining the degree of supercooling of the indoor unit in the target time period, the method further includes:

[0019] When the average heating amount of the outdoor unit decreases, the air volume of the indoor unit is controlled to be locked.

[0020] In some possible implementations, when the average heating amount of the outdoor unit decreases, controlling the air volume of the indoor unit to lock includes:

[0021] Obtaining the heating capacity of the outdoor unit;

[0022] Determine the average heating capacity of the outdoor unit according to the heating capacity of the outdoor unit, the operating time of the air conditioner and the current time;

[0023] Comparing the average heating capacity of the outdoor unit at the current moment with the average heating capacity of the outdoor unit at the previous moment;

[0024] When the average heating amount of the outdoor unit decreases, the air volume of the indoor unit is controlled to be locked.

[0025] In some possible implementations, the heating amount of the outdoor unit is obtained based on the refrigerant circulation amount of the outdoor unit, the refrigerant enthalpy value at the heat exchanger outlet of the outdoor unit, and the refrigerant enthalpy value at the heat exchanger inlet of the outdoor unit.

[0026] In a second aspect, the present application provides a defrost control device. The device comprises:

[0027] An acquisition module, used for acquiring the supercooling degree of the indoor unit in a target time period;

[0028] A determination module, configured to determine a supercooling degree change rate of the indoor unit according to the supercooling degree of the indoor unit in a target time period;

[0029] The control module is used to control the outdoor unit to defrost when the supercooling change rate of the indoor unit is greater than the supercooling change rate threshold.

[0030] In some possible implementations, the determining module is specifically configured to:

[0031] Determining, according to the supercooling degree of the indoor unit in the target time period, a first time when the supercooling degree of the indoor unit reaches a first preset value and a second time when the supercooling degree of the indoor unit reaches a second preset value;

[0032] The supercooling degree change rate of the indoor unit is determined according to the first preset value, the second preset value, the first moment and the second moment.

[0033] In some possible implementations, the acquisition module is specifically used to:

[0034] When the opening degree of the electronic expansion valve of the indoor unit is greater than the opening degree threshold, the supercooling degree of the indoor unit in the target time period is obtained.

[0035] In some possible implementations, the acquisition module is further configured to:

[0036] Obtaining the degree of supercooling of the outdoor unit;

[0037] The control module is also used for:

[0038] When the degree of supercooling of the outdoor unit satisfies a defrosting stop condition, the outdoor unit is controlled to stop defrosting.

[0039] In some possible implementations, the control module is further configured to:

[0040] When the average heating amount of the outdoor unit decreases, the air volume of the indoor unit is controlled to be locked.

[0041] In some possible implementations, the control module is specifically configured to:

[0042] Obtaining the heating capacity of the outdoor unit;

[0043] Determine the average heating capacity of the outdoor unit according to the heating capacity of the outdoor unit, the operating time of the air conditioner and the current time;

[0044] Comparing the average heating capacity of the outdoor unit at the current moment with the average heating capacity of the outdoor unit at the previous moment;

[0045] When the average heating amount of the outdoor unit decreases, the air volume of the indoor unit is controlled to be locked.

[0046] In some possible implementations, the heating amount of the outdoor unit is obtained based on the refrigerant circulation amount of the outdoor unit, the refrigerant enthalpy value at the heat exchanger outlet of the outdoor unit, and the refrigerant enthalpy value at the heat exchanger inlet of the outdoor unit.

[0047] In a third aspect, the present application provides a defrost control system, wherein the system comprises a controller and an actuator, wherein instructions are stored in the controller, and the actuator executes the instructions, so that the system executes the method described in the first aspect of the present application or any implementation of the first aspect.

[0048] In a fourth aspect, the present application provides an air conditioner, wherein the air conditioner comprises the system as described in the third aspect of the present application.

[0049] Based on the implementations provided in the above aspects, this application can also be further combined to provide more implementations.

[0050] Based on the above description, it can be seen that the technical solution of this application has the following beneficial effects:

[0051] Specifically, the method obtains the degree of supercooling of the indoor unit in the target time period, determines the rate of change of the degree of supercooling of the indoor unit, and controls the outdoor unit to defrost when the rate of change of the degree of supercooling of the indoor unit is greater than the threshold value of the rate of change of the degree of supercooling. When the air conditioner is in heating operation, the method reflects the impact of frost on the performance of the air conditioner based on the change of the degree of supercooling of the indoor unit, and controls the outdoor unit to defrost, thereby accurately grasping the timing of entering the defrosting process to improve the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The above and other features, advantages and aspects of the embodiments of the present application will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. Throughout the accompanying drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and the originals and elements are not necessarily drawn to scale.

[0053] Figure 1 A schematic diagram of the structure of an outdoor unit heat exchanger of an air conditioner provided in an embodiment of the present application;

[0054] Figure 2 A schematic diagram of the structure of a heat exchanger for an indoor unit of an air conditioner provided in an embodiment of the present application;

[0055] Figure 3A schematic flow chart of a defrost control method for an air conditioner provided in an embodiment of the present application;

[0056] Figure 4 A schematic flow chart of another defrost control method for an air conditioner provided in an embodiment of the present application;

[0057] Figure 5 A structural schematic diagram of a defrost control device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0058] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be construed as being limited to the embodiments described herein. Instead, these embodiments are provided to provide a more thorough and complete understanding of the present application. It should be understood that the drawings and embodiments of the present application are only for exemplary purposes and are not intended to limit the scope of protection of the present application.

[0059] The term "including" and its variations used herein are open inclusions, i.e., "including but not limited to". The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". The relevant definitions of other terms will be given in the following description.

[0060] It should be noted that the concepts such as "first" and "second" mentioned in this application are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0061] It should be noted that the modifications of "one" and "plurality" mentioned in the present application are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0062] In order to facilitate understanding of the technical solution of the present application, the specific application scenarios of the present application are described below.

[0063] Air conditioner, also known as air conditioner or air conditioner, is a device that uses artificial means to adjust and control the temperature, humidity, flow rate and other parameters of the ambient air in a building or structure. Most of them use the refrigerant to evaporate or condense under the action of the compressor, thereby causing the evaporation or condensation of the surrounding air to achieve the purpose of changing the temperature and humidity.

[0064] In winter when the outdoor temperature is low, users can run the air conditioner in heating mode to make the indoor temperature reach a suitable level. When the air conditioner is running in heating mode, due to the low outdoor ambient temperature, the moisture in the air will condense into frost on the outdoor unit of the air conditioner, i.e. frosting occurs. As the air conditioner runs for longer, the thickness of the frost on the outdoor unit will also increase. The frost layer causes the performance of the outdoor unit heat exchanger to decline, thus affecting the heating effect of the air conditioner. Therefore, the air conditioner needs to be defrosted when the frost layer is thick.

[0065] In response to the above-mentioned defrosting control problem of air conditioners, the industry usually adopts the time-temperature control method to realize automatic defrosting of air conditioners. For example, the air conditioning control system determines whether to enter the defrosting process of the air conditioner based on the outdoor ambient temperature, the accumulated heating time after the last defrosting, and the temperature of the outdoor unit condenser coil. However, the above method only relies on time and temperature, and cannot accurately reflect the impact of frosting on the heating performance of the air conditioner. It is very easy to have unnecessary defrosting processes, or the defrosting process is not entered when defrosting is required, thereby reducing the heating capacity of the air conditioner and affecting the user experience.

[0066] Based on this, an embodiment of the present application provides a defrost control method for an air conditioner. Specifically, the method obtains the degree of supercooling of the indoor unit in a target time period, determines the rate of change of the degree of supercooling of the indoor unit, and controls the outdoor unit to defrost when the rate of change of the degree of supercooling of the indoor unit is greater than the threshold value of the rate of change of the degree of supercooling. When the air conditioner is in heating operation, the method reflects the impact of frost on the performance of the air conditioner based on the change of the degree of supercooling of the indoor unit, and controls the outdoor unit to defrost, thereby accurately grasping the timing of entering the defrost process to improve the user experience.

[0067] The following will be combined Figure 1 and Figure 2 , the structure of the heat exchanger of the outdoor unit and indoor unit of the air conditioner is introduced.

[0068] Figure 1 The figure is a schematic diagram of the structure of an outdoor heat exchanger of an air conditioner. The outdoor heat exchanger 100 includes a heat exchanger assembly 101, a flow-dividing capillary assembly 102, a gas collecting pipe assembly 103, an electronic expansion valve 104 and a flow divider 105. The arrow direction indicates the refrigerant flow direction when the outdoor heat exchanger 100 operates in the heating mode. In addition, the outdoor heat exchanger 100 also includes a refrigerant pressure sensor 106, an outdoor liquid pipe temperature sensor 107, an outdoor ambient temperature sensor 108 and an outdoor gas pipe temperature sensor 109.

[0069] Specifically, the refrigerant pressure sensor 106 can collect the refrigerant pressure, thereby assisting in calculating the refrigerant enthalpy at the inlet and outlet of the outdoor unit heat exchanger, and calculating the degree of subcooling of the outdoor unit during the defrosting process. The outdoor liquid pipe temperature sensor 107 is used to collect the temperature of the outdoor unit liquid pipe, the outdoor unit environment temperature sensor 108 is used to collect the temperature of the environment where the outdoor unit is located, and the outdoor unit gas pipe temperature sensor 109 is used to collect the temperature of the outdoor unit gas pipe.

[0070] Figure 2 The figure is a schematic diagram of the structure of an indoor heat exchanger of an air conditioner. The indoor heat exchanger 200 includes a heat exchanger assembly 201 and an electronic expansion valve 202. The arrow direction indicates the refrigerant flow direction when the indoor heat exchanger 200 operates in the heating mode. In addition, the indoor heat exchanger 200 also includes an indoor environment temperature sensor 203, an indoor liquid pipe temperature sensor 204, and an indoor gas pipe temperature sensor 205.

[0071] Specifically, the indoor unit environment temperature sensor 203 is used to collect the temperature of the environment where the indoor unit is located, that is, the return air temperature of the indoor unit, the indoor unit liquid pipe temperature sensor 204 is used to collect the temperature of the indoor unit liquid pipe, and the indoor unit gas pipe temperature sensor 205 is used to collect the temperature of the indoor unit gas pipe. The control system of the air conditioner can control the air conditioner according to the parameters collected by the pressure sensor and temperature sensor deployed on the outdoor unit and the indoor unit.

[0072] Next, the defrost control method for the air conditioner provided in the embodiment of the present application is described in detail with reference to the accompanying drawings.

[0073] See also Figure 3 The flowchart of a defrost control method for an air conditioner is shown in FIG. 1 . The method can be executed by a defrost control system and specifically includes the following steps:

[0074] S301: The defrost control system obtains the degree of supercooling of the indoor unit in a target time period.

[0075] In the embodiment of the present application, since the subcooling of the indoor unit can indirectly reflect the heat exchange effect and air supply comfort effect of the heat exchanger, the defrost control system determines the timing of defrosting by the change of the subcooling of the indoor unit. First, the defrost control system needs to obtain the subcooling of the indoor unit in the target time period. For example, the defrost control system can determine the subcooling of the indoor unit in a defrost cycle based on the condensing temperature and the indoor unit liquid pipe temperature, where the condensing temperature can be determined based on the pressure on the exhaust side of the compressor. The defrost control system can be determined by SC=T 冷凝 -T l Determine the subcooling degree of the indoor unit, where SC represents the subcooling degree of the indoor unit, T 冷凝 Indicates the condensing temperature of the indoor unit, T lIndicates the indoor unit liquid pipe temperature.

[0076] In some possible implementations, when the opening of the electronic expansion valve of the indoor unit is greater than the opening threshold, the defrost control system can obtain the degree of supercooling of the indoor unit in the target time period. It is understandable that as the outdoor unit begins to frost, the heat exchange capacity of the outdoor unit heat exchanger decreases, resulting in a decrease in the opening of the outdoor unit electronic expansion valve, thereby reducing the refrigerant circulation volume. At this time, due to the temperature difference between the inlet and outlet air of the indoor unit, the degree of supercooling of the indoor unit will gradually increase, thereby increasing the opening of the electronic expansion valve of the indoor unit. When the opening of the electronic expansion valve of the indoor unit is greater than the opening threshold, the degree of supercooling of the indoor unit begins to be obtained. Among them, the opening threshold can be the opening of the electronic expansion valve of the indoor unit when it is fully open, for example, 480pls.

[0077] S302: The defrost control system determines a supercooling degree change rate of the indoor unit according to the supercooling degree of the indoor unit in the target time period.

[0078] Specifically, the defrost control system can determine the first moment when the supercooling of the indoor unit reaches a first preset value and the second moment when the supercooling of the indoor unit reaches a second preset value according to the supercooling of the indoor unit in the target time period, and then determine the rate of change of the supercooling of the indoor unit according to the first preset value, the second preset value, the first moment and the second moment.

[0079] For example, the first preset value SC1=5°C, the second preset value SC2=15°C. According to the change of the supercooling degree of the indoor unit, the first moment t1=15s when the first preset value is reached and the second moment t2=45s when the second preset value is reached are determined. Therefore, the supercooling change rate Y=1 / 3 of the indoor unit can be determined based on the formula Y=(SC2-SC1) / (t2-t1).

[0080] S303: When the supercooling change rate of the indoor unit is greater than the supercooling change rate threshold, the defrost control system controls the outdoor unit to defrost.

[0081] Specifically, when the supercooling change rate of the indoor unit is greater than the supercooling change rate threshold, it indicates that the supercooling of the indoor unit increases too fast, that is, the indoor unit can provide insufficient heat, resulting in a decrease in the outlet air temperature, affecting the user's comfort. At this time, the outdoor unit needs to enter the defrosting process, that is, the defrosting control system controls the outdoor unit to defrost.

[0082] In some possible implementations, the defrost control system can also perform a double judgment of defrost control in combination with the defrost temperature. Specifically, the defrost control system can determine the defrost temperature through the temperature collected by the defrost temperature sensor deployed at the outdoor unit shunt capillary assembly. When the defrost temperature is less than the defrost temperature threshold and the accumulated time reaches the time threshold, the defrost temperature of the outdoor unit meets the defrost condition. When the supercooling change rate of the indoor unit is greater than the supercooling change rate threshold and the defrost temperature of the outdoor unit meets the defrost condition, the defrost control system controls the outdoor unit to defrost.

[0083] The method obtains the degree of supercooling of the indoor unit in the target time period, determines the rate of change of the degree of supercooling of the indoor unit, and controls the outdoor unit to defrost when the rate of change of the degree of supercooling of the indoor unit is greater than the threshold value of the rate of change of the degree of supercooling. When the air conditioner is in heating operation, the method reflects the impact of frost on the performance of the air conditioner based on the change of the degree of supercooling of the indoor unit, and controls the outdoor unit to defrost, thereby accurately grasping the timing of entering the defrosting process to improve the user experience.

[0084] See also Figure 4 FIG. 1 is a flow chart of another defrost control method for an air conditioner, which can be executed by a defrost control system and specifically includes the following steps:

[0085] S401: When the average heating capacity of the outdoor unit decreases, the defrost control system controls the air volume of the indoor unit to lock.

[0086] Specifically, when the air conditioner operates in heating mode, the defrost control system can obtain the heating amount of the outdoor unit, and determine the average heating amount of the outdoor unit based on the heating amount of the outdoor unit, the operating time of the air conditioner and the current time, and then compare the average heating amount of the outdoor unit at the current time with the average heating amount of the outdoor unit at the previous time. When the average heating amount of the outdoor unit decreases, the defrost control system controls the air volume lock of the indoor unit.

[0087] In some possible implementations, the defrost control system can obtain the heating capacity Q of the outdoor unit according to the refrigerant circulation volume G of the outdoor unit, the refrigerant enthalpy value h2 at the heat exchanger outlet of the outdoor unit, and the refrigerant enthalpy value h1 at the heat exchanger inlet of the outdoor unit. h , for example, based on the formula Q h =G(h2-h1) to obtain the heating capacity of the outdoor unit.

[0088] Furthermore, the average heating capacity Q of the outdoor unit at the current time can be determined based on the heating capacity of the outdoor unit, the operating time of the air conditioner and the current time. v (n), and then determine the time t0 when the average heating capacity of the outdoor unit decreases. Before time t0, there is Q v (n)-Q v(n-1)≥0, at this time, the heating capacity of the air conditioner meets the requirements, and the electronic expansion valve of the outdoor unit is controlled according to the superheat of the outdoor unit heat exchanger. After t0, there is Q v (n)-Q v (n-1)<0, indicating that the heating capacity of the outdoor unit has reached its peak. At this time, the air volume of the indoor unit is controlled to be locked, so that the subcooling degree of the indoor unit is not affected by the change of air volume, making the judgment of defrosting timing more accurate.

[0089] S402: The defrost control system obtains the degree of supercooling of the indoor unit in the target time period.

[0090] This step is similar to the above-mentioned S301 and will not be described in detail here.

[0091] S403: The defrost control system determines a supercooling degree change rate of the indoor unit according to the supercooling degree of the indoor unit in the target time period.

[0092] This step is similar to the above-mentioned S302 and will not be described in detail here.

[0093] S404: When the supercooling change rate of the indoor unit is greater than the supercooling change rate threshold, the defrost control system controls the outdoor unit to defrost.

[0094] This step is similar to the above S303 and will not be described again here.

[0095] S405: The defrost control system obtains the degree of supercooling of the outdoor unit.

[0096] During the defrosting process of the outdoor unit, it can be determined whether to exit the defrosting process according to the supercooling degree of the outdoor unit. Specifically, the supercooling degree of the outdoor unit can be determined by the condensing temperature T′ of the outdoor unit. 冷凝 and outdoor unit liquid pipe temperature T′ l For example, the condensing temperature of the outdoor unit can be obtained by collecting the refrigerant pressure of the outdoor unit by the refrigerant pressure sensor deployed on the outdoor unit, and the condensing temperature T′ of the outdoor unit can be determined by the corresponding relationship between the refrigerant pressure of the outdoor unit and the condensing temperature of the outdoor unit. 冷凝 , then based on the formula SC′=T′ 冷凝 -T′ l The subcooling degree SC' of the outdoor unit is obtained.

[0097] S406: When the degree of supercooling of the outdoor unit meets the defrosting stop condition, the defrosting control system controls the outdoor unit to stop defrosting.

[0098] Specifically, when the air conditioner is defrosted in the heating mode, the fan of the outdoor unit stops running, and the frost layer of the outdoor unit exchanges heat with the refrigerant, thereby achieving defrosting. When the frost layer is thicker, the refrigerant can release more heat into the frost layer, so the subcooling degree of the outdoor unit is larger and the rate of change of the subcooling degree is also larger. When the defrosting is carried out for a period of time and the frost layer is thinner, the subcooling degree and the rate of change of the subcooling degree of the outdoor unit are both smaller. Therefore, the condition for stopping defrosting can be that the subcooling degree of the outdoor unit is less than the first preset threshold value, and the rate of change of the subcooling degree of the outdoor unit is less than the second preset threshold value.

[0099] Furthermore, the defrost control system can also determine whether to stop defrosting based on the defrost duration. For example, when the defrost duration is greater than a preset defrost duration threshold, the defrost control system controls the outdoor unit to stop defrosting, thereby avoiding the inability to stop the defrost process due to a sensor detection failure.

[0100] When the average heating capacity of the outdoor unit decreases, the method controls the air volume of the indoor unit to lock, then obtains the degree of supercooling of the indoor unit in the target time period, thereby determining the supercooling change rate of the indoor unit. When the supercooling change rate of the indoor unit is greater than the supercooling change rate threshold, the outdoor unit is controlled to defrost, then the degree of supercooling of the outdoor unit is obtained, and when the degree of supercooling of the outdoor unit meets the condition for stopping defrosting, the outdoor unit is controlled to stop defrosting. When the heat exchange capacity of the outdoor unit begins to decrease, the method locks the air volume of the indoor unit, thereby eliminating the influence of the air volume on the degree of supercooling, and then controls the outdoor unit to defrost according to the degree of supercooling change rate of the indoor unit, so as to accurately grasp the defrosting timing, and control the outdoor unit to stop defrosting according to the degree of supercooling of the outdoor unit, thereby improving the user experience.

[0101] Based on the defrost control method for an air conditioner provided in the embodiment of the present application, the embodiment of the present application also provides a defrost control device corresponding to the above method. The units / modules involved in the embodiments of the present application can be implemented by software or by hardware. The name of the unit / module does not constitute a limitation on the unit / module itself in some cases.

[0102] See also Figure 5 The structural schematic diagram of the defrost control device shown in FIG. 5 includes:

[0103] An acquisition module 501 is used to acquire the degree of supercooling of the indoor unit in a target time period;

[0104] A determination module 502, configured to determine a supercooling degree change rate of the indoor unit according to the supercooling degree of the indoor unit in a target time period;

[0105] The control module 503 is used to control the outdoor unit to defrost when the supercooling change rate of the indoor unit is greater than the supercooling change rate threshold.

[0106] In some possible implementations, the determination module 502 is specifically configured to:

[0107] Determining, according to the supercooling degree of the indoor unit in the target time period, a first time when the supercooling degree of the indoor unit reaches a first preset value and a second time when the supercooling degree of the indoor unit reaches a second preset value;

[0108] The supercooling degree change rate of the indoor unit is determined according to the first preset value, the second preset value, the first moment and the second moment.

[0109] In some possible implementations, the acquisition module 501 is specifically used to:

[0110] When the opening degree of the electronic expansion valve of the indoor unit is greater than the opening degree threshold, the supercooling degree of the indoor unit in the target time period is obtained.

[0111] In some possible implementations, the acquisition module 501 is further configured to:

[0112] Get the subcooling degree of the outdoor unit;

[0113] The control module 503 is also used for:

[0114] When the degree of supercooling of the outdoor unit meets the conditions for stopping defrosting, the outdoor unit is controlled to stop defrosting.

[0115] In some possible implementations, the control module 503 is further configured to:

[0116] When the average heating capacity of the outdoor unit decreases, the air volume of the indoor unit is controlled to be locked.

[0117] In some possible implementations, the control module 503 is specifically configured to:

[0118] Get the heating capacity of the outdoor unit;

[0119] Determine the average heating capacity of the outdoor unit according to the heating capacity of the outdoor unit, the operating time of the air conditioner and the current time;

[0120] Compare the average heating capacity of the outdoor unit at the current moment with the average heating capacity of the outdoor unit at the previous moment;

[0121] When the average heating capacity of the outdoor unit decreases, the air volume of the indoor unit is controlled to be locked.

[0122] In some possible implementations, the heating amount of the outdoor unit is obtained based on the refrigerant circulation amount of the outdoor unit, the refrigerant enthalpy value at the heat exchanger outlet of the outdoor unit, and the refrigerant enthalpy value at the heat exchanger inlet of the outdoor unit.

[0123] The defrost control device 500 according to the embodiment of the present application may correspond to the method described in the embodiment of the present application, and the above and other operations and / or functions of each module / unit of the defrost control device 500 are respectively to achieve Figure 3 and Figure 4 For the sake of brevity, the corresponding processes of each method in the illustrated embodiment are not described in detail here.

[0124] The present application also provides a defrost control system, which includes a controller and an actuator, wherein the controller stores instructions, and the actuator executes the instructions, so that the defrost control system executes the defrost control method of the air conditioner.

[0125] The embodiment of the present application further provides an air conditioner, which includes the above-mentioned defrost control system.

[0126] Although the subject matter has been described in language specific to structural features and / or methodological logical actions, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. On the contrary, the specific features and actions described above are merely example forms of implementing the claims.

[0127] Although several specific implementation details are included in the above discussion, these should not be interpreted as limiting the scope of the present application. Certain features described in the context of a separate embodiment can also be implemented in a single embodiment in combination. On the contrary, the various features described in the context of a single embodiment can also be implemented in multiple embodiments individually or in any suitable sub-combination.

[0128] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of disclosure involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above disclosed concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other to form a technical solution.

Claims

1. A defrosting control method for an air conditioner, characterized in that: The air conditioner comprises an indoor unit and an outdoor unit, and the method comprises: When the opening degree of the electronic expansion valve of the indoor unit is greater than the opening degree threshold, obtaining the supercooling degree of the indoor unit in the target time period; Determining a supercooling degree change rate of the indoor unit according to the supercooling degree of the indoor unit in a target time period; When the supercooling degree change rate of the indoor unit is greater than the supercooling degree change rate threshold, the outdoor unit is controlled to perform defrosting.

2. The method according to claim 1, characterized in that The step of determining the supercooling degree change rate of the indoor unit according to the supercooling degree of the indoor unit in the target time period includes: Determining, according to the supercooling degree of the indoor unit in the target time period, a first time when the supercooling degree of the indoor unit reaches a first preset value and a second time when the supercooling degree of the indoor unit reaches a second preset value; The supercooling degree change rate of the indoor unit is determined according to the first preset value, the second preset value, the first moment and the second moment.

3. The method according to claim 1, characterized in that The method further comprises: Obtaining the degree of supercooling of the outdoor unit; When the degree of supercooling of the outdoor unit satisfies a defrosting stop condition, the outdoor unit is controlled to stop defrosting.

4. The method according to claim 1, characterized in that: Before obtaining the supercooling degree of the indoor unit in the target time period, the method further includes: When the average heating amount of the outdoor unit decreases, the air volume of the indoor unit is controlled to be locked.

5. The method according to claim 4, characterized in that When the average heating amount of the outdoor unit decreases, controlling the air volume of the indoor unit to lock includes: Obtaining the heating capacity of the outdoor unit; Determine the average heating capacity of the outdoor unit according to the heating capacity of the outdoor unit, the operating time of the air conditioner and the current time; Comparing the average heating capacity of the outdoor unit at the current moment with the average heating capacity of the outdoor unit at the previous moment; When the average heating amount of the outdoor unit decreases, the air volume of the indoor unit is controlled to be locked.

6. The method according to claim 5, characterized in that The heating amount of the outdoor unit is obtained based on the refrigerant circulation amount of the outdoor unit, the refrigerant enthalpy value at the heat exchanger outlet of the outdoor unit, and the refrigerant enthalpy value at the heat exchanger inlet of the outdoor unit.

7. A defrost control device, characterized in that: The device comprises: An acquisition module, used for acquiring the degree of supercooling of the indoor unit in a target time period when the opening degree of the electronic expansion valve of the indoor unit is greater than an opening degree threshold; A determination module, configured to determine a supercooling degree change rate of the indoor unit according to the supercooling degree of the indoor unit in a target time period; The control module is used to control the outdoor unit to defrost when the supercooling change rate of the indoor unit is greater than the supercooling change rate threshold.

8. A defrost control system, characterized in that: The system comprises a controller and an actuator, wherein instructions are stored in the controller and the actuator executes the instructions, so that the system executes the method according to any one of claims 1 to 6.

9. An air conditioner, characterized in that: The air conditioner includes the defrost control system according to claim 8.

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