Defrosting control methods, devices, storage media, and air conditioners

Abstract

This application discloses a defrosting control method, device, storage medium, and air conditioner for an air conditioner, relating to the field of air conditioning technology. The method includes: when the air conditioner is in heating mode, detecting the temperature of the outdoor first coil; if the outdoor first coil temperature is less than a first threshold but greater than a second threshold, controlling the outdoor fan to enhance heat exchange to pre-defrost the condenser; if the outdoor first coil temperature is less than or equal to the second threshold, detecting the temperature of the outdoor second coil; comparing the outdoor second coil temperature with the second threshold, and controlling the opening of the first electronic expansion valve and / or the second electronic expansion valve according to the comparison result to increase the gas flow from the evaporator to the condenser for defrosting. This application can effectively defrost the outdoor unit without stopping the indoor unit and with small changes in indoor temperature, improving user comfort.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, specifically to a defrosting control method, device, storage medium, and air conditioner for an air conditioner. Background Technology

[0002] When an air conditioner is running in heating mode, the condenser in the outdoor unit may frost up due to low ambient temperature. Therefore, the air conditioner usually uses heating anti-freeze to defrost. The conventional way for air conditioners to use heating anti-freeze is to achieve the defrosting requirement by frequently turning the control on and off. However, this method can easily cause problems such as frequent start-stop, high power consumption, and large temperature differences in the room, resulting in a poor comfort experience. Summary of the Invention

[0003] This application provides a defrosting control scheme for an air conditioner, which can effectively defrost the outdoor unit without stopping the indoor unit and with small changes in indoor temperature, thereby improving the user's comfort experience.

[0004] The embodiments of this application provide the following technical solutions:

[0005] According to one embodiment of this application, a defrosting control method for an air conditioner is provided. The air conditioner includes an indoor unit and an outdoor unit. The indoor unit includes an evaporator, and the outdoor unit includes an outdoor fan and a condenser. A first electronic expansion valve for operation and a second electronic expansion valve for standby are provided in the passage between the evaporator and the condenser. The method includes: when the air conditioner is in heating mode, detecting the temperature of a first outdoor coil, the first outdoor coil temperature being the temperature of the coil near the upper part of the condenser; if the first outdoor coil temperature is less than a first threshold and greater than a second threshold, controlling the outdoor fan to enhance heat exchange to pre-defrost the condenser; if the first outdoor coil temperature is less than or equal to the second threshold, detecting the temperature of a second outdoor coil, the second outdoor coil temperature being the temperature of the coil near the lower part of the condenser; comparing the second outdoor coil temperature with the second threshold, and controlling the opening of the first electronic expansion valve and / or the second electronic expansion valve according to the comparison result to increase the gas flow from the evaporator to the condenser to defrost the condenser.

[0006] In some embodiments of this application, controlling the opening of the first electronic expansion valve and / or the second electronic expansion valve according to the comparison result to increase the gas flow rate from the evaporator to the condenser for defrosting the condenser includes: if the outdoor second coil temperature is less than or equal to the second threshold, then activating the second electronic expansion valve and jointly controlling the opening of the first electronic expansion valve and the second electronic expansion valve to increase the gas flow rate from the evaporator to the condenser for overall defrosting of the condenser; if the outdoor second coil temperature is greater than the second threshold, then controlling the opening of the second electronic expansion valve to increase the gas flow rate from the evaporator to the condenser for upper defrosting of the condenser.

[0007] In some embodiments of this application, after controlling the opening of the second electronic expansion valve to increase the gas flow from the evaporator to the condenser for defrosting the upper part of the condenser, the method further includes: obtaining a first opening degree of the second electronic expansion valve after it has been increased, and obtaining state parameters in the air conditioner to obtain a first state parameter; calculating a first target opening degree based on the first state parameter; controlling the second electronic expansion valve to increase to a second opening degree, and obtaining state parameters in the air conditioner to obtain a second state parameter; calculating a second target opening degree based on the second state parameter; and analyzing the first opening degree, the first target opening degree, the second opening degree, and the second target opening degree to determine the effectiveness of the opening degree of the second electronic expansion valve.

[0008] In some embodiments of this application, the state parameters include exhaust temperature, exhaust pressure, outdoor coil temperature, indoor coil temperature, and intake pressure.

[0009] In some embodiments of this application, the step of analyzing the first opening degree, the first target opening degree, the second opening degree, and the second target opening degree to obtain the validity of the second opening degree includes: subtracting the first opening degree from the first target opening degree to obtain a first opening degree difference; subtracting the second opening degree from the second target opening degree to obtain a second opening degree difference; subtracting the second opening degree difference from the first opening degree difference to obtain a target difference value; if the target difference value is less than a preset difference value threshold, the validity of the opening degree of the second electronic expansion valve is valid; if the target difference value is greater than or equal to the preset difference value threshold, the validity of the opening degree of the second electronic expansion valve is invalid.

[0010] In some embodiments of this application, the step of enhancing heat exchange by controlling the external fan to pre-defrost the condenser includes: obtaining the rotational speed of the external fan; if the rotational speed is less than a predetermined rotational speed threshold, then enhancing heat exchange by controlling the external fan to pre-defrost the condenser.

[0011] In some embodiments of this application, the outdoor unit further includes a second outdoor fan; the method further includes: if the rotational speed is greater than or equal to a predetermined rotational speed threshold, then starting the second outdoor fan, and enhancing heat exchange by controlling the rotational speed of the outdoor fan and the second outdoor fan to pre-defrost the condenser.

[0012] According to one embodiment of this application, a defrosting control device for an air conditioner includes: a memory storing a computer program; and a processor for reading the computer program stored in the memory to execute the method described in the embodiment of this application.

[0013] According to another embodiment of this application, a storage medium stores a computer program thereon, which, when executed by a computer's processor, causes the computer to perform the methods described in the embodiments of this application.

[0014] According to another embodiment of this application, an air conditioner may include a defrosting control device for the air conditioner.

[0015] According to another embodiment of this application, a computer program product or computer program includes computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the computer device to perform the methods provided in the various optional implementations described in the embodiments of this application.

[0016] In this embodiment, the air conditioner includes an indoor unit and an outdoor unit. The indoor unit includes an evaporator, and the outdoor unit includes an outdoor fan and a condenser. A first electronic expansion valve for operation and a second electronic expansion valve for standby are provided in the passage between the evaporator and the condenser. The method includes: when the air conditioner is in heating mode, detecting the temperature of the first outdoor coil, which is the temperature of the coil near the upper part of the condenser; if the temperature of the first outdoor coil is less than a first threshold and greater than a second threshold, controlling the outdoor fan to enhance heat exchange to pre-defrost the condenser; if the temperature of the first outdoor coil is less than or equal to the second threshold, detecting the temperature of the second outdoor coil, which is the temperature of the coil near the lower part of the condenser; comparing the temperature of the second outdoor coil with the second threshold, and controlling the opening of the first electronic expansion valve and / or the second electronic expansion valve according to the comparison result to increase the gas flow from the evaporator to the condenser to defrost the condenser.

[0017] In this way, when the air conditioner is in heating mode, the temperature of the outdoor first coil is monitored and compared with a first threshold and a second threshold. When the outdoor first coil temperature is lower than the first threshold but higher than the second threshold, the outdoor fan is controlled to enhance heat exchange for pre-defrosting of the condenser. Conversely, when the outdoor first coil temperature is lower than or equal to the second threshold, the outdoor second coil temperature is detected and compared with the second threshold. Based on the comparison result, the opening of the first and / or second electronic expansion valves is controlled to increase the gas flow from the evaporator to the condenser for defrosting. Overall, this method effectively defrosts the outdoor unit without shutting down the indoor unit and with minimal indoor temperature fluctuations, improving user comfort. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A flowchart of a defrosting control method for an air conditioner according to an embodiment of this application is shown.

[0020] Figure 2 A schematic diagram of the installation of a temperature sensor according to an embodiment of this application is shown.

[0021] Figure 3 A defrosting control flowchart according to an embodiment of this application is shown.

[0022] Figure 4 A defrosting control flowchart according to another embodiment of this application is shown.

[0023] Figure 5 A block diagram of a defrosting control device for an air conditioner according to an embodiment of this application is shown.

[0024] Figure 6 A block diagram of an air conditioner according to one embodiment of this application is shown. Detailed Implementation

[0025] The present disclosure will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the embodiments provided herein are merely illustrative of the present disclosure and are not intended to limit the present disclosure. Furthermore, the embodiments provided below are some embodiments for implementing the present disclosure, and not all embodiments for implementing the present disclosure. Unless otherwise specified, the technical solutions described in the embodiments of the present disclosure can be implemented in any combination.

[0026] It should be noted that, in the embodiments of this disclosure, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a method or apparatus that includes a list of elements includes not only the elements expressly described, but also other elements not expressly listed, or elements inherent to implementing the method or apparatus. Without further limitations, an element defined by the phrase "comprising a..." does not exclude the presence of other related elements (e.g., steps in the method or units in the apparatus, such as portions of circuitry, processors, programs, or software, etc.) in the method or apparatus that includes that element.

[0027] For example, the defrosting control method for an air conditioner provided in this disclosure includes a series of steps, but the defrosting control method for an air conditioner provided in this disclosure is not limited to the steps described. Similarly, the defrosting control device for an air conditioner provided in this disclosure includes a series of units, but the device provided in this disclosure is not limited to the units explicitly described, but may also include units that need to be set up for obtaining relevant information or processing based on the information.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure.

[0029] It is understood that in the specific implementation of this application, relevant data is involved. When the embodiments in this application are applied to specific products or technologies, user permission or consent is required, and the collection, use and processing of relevant data must comply with the relevant laws, regulations and standards of the relevant countries and regions.

[0030] Figure 1 A flowchart illustrating a defrosting control method for an air conditioner according to an embodiment of this application is shown. The entity executing this defrosting control method can be any control device with processing capabilities, such as an air conditioner, mobile phone, computer, smartwatch, and other home appliances. In one specific embodiment of this application, the control device executing the defrosting control method is specifically the air conditioner itself, and the air conditioner specifically performs defrosting control through its controller.

[0031] The air conditioner includes an indoor unit and an outdoor unit. The indoor unit includes an evaporator, and the outdoor unit includes an external blower and a condenser. A first electronic expansion valve for operation and a second electronic expansion valve for backup are provided in the passage between the evaporator and the condenser. Specifically, the passage may include a first passage and a second passage connected in parallel. The first electronic expansion valve is provided on the first passage, and the second electronic expansion valve is provided on the second passage. When the air conditioner operates in the heating mode, the first electronic expansion valve opens and the first passage is opened, while the second electronic expansion valve closes and the second passage is not opened.

[0032] As Figure 1 shown, the defrost control method of the air conditioner may include steps S110 to S140.

[0033] Step S110, when the air conditioner is in the heating mode, detect the outdoor first coil temperature, where the outdoor first coil temperature is the coil temperature of the coil near the upper part of the condenser; Step S120, if the outdoor first coil temperature is less than the first threshold and greater than the second threshold, then enhance heat exchange by controlling the external blower to pre-defrost the condenser; Step S130, if the outdoor first coil temperature is less than or equal to the second threshold, then detect the outdoor second coil temperature, where the outdoor second coil temperature is the coil temperature of the coil near the lower part of the condenser; Step S140, compare the outdoor second coil temperature with the second threshold, and control the opening degree of the first electronic expansion valve and / or the second electronic expansion valve according to the comparison result to increase the gas flow rate from the evaporator to the condenser to defrost the condenser.

[0034] Refer to Figure 2 , for the condenser 210 of the outdoor unit of the air conditioner, a first outdoor coil temperature sensor may be installed at the coil 220 near the upper part of the condenser 210, and a second outdoor coil temperature sensor may be installed at the coil 230 near the lower part of the condenser 210. When the air conditioner is in the heating mode, the outdoor first coil temperature To can be detected first through the first outdoor coil temperature sensor, and the outdoor first coil temperature is the coil temperature of the coil near the upper part of the condenser.

[0035] Pre-set a first threshold T1 and a second threshold T2, and compare the outdoor first coil temperature To with the first threshold T1 and the second threshold T2 respectively. If T2 < To < T1, it means that the temperature at the coil 220 near the upper part of the condenser 210 is relatively low, and there is a risk of the condenser frosting. At this time, enhance heat exchange by controlling the external blower in the outdoor unit. Enhancing heat exchange can increase the temperature of the gas flowing from the evaporator in the indoor unit to the condenser in the outdoor unit, thereby pre-defrosting the condenser and initially preventing the risk of the condenser frosting.

[0036] Further, if To is less than or equal to T2, the outdoor second coil temperature Tk is further detected by a second outdoor coil temperature sensor, and this outdoor second coil temperature is the coil temperature of the coil near the lower part of the condenser. Then, the outdoor second coil temperature Tk is compared with the second threshold T2 to obtain a comparison result.

[0037] This comparison result can further reflect the frosting condition at the lower part of the condenser. According to the comparison result, the opening degrees of the first electronic expansion valve and / or the second electronic expansion valve are controlled. Based on the working first electronic expansion valve (which has been started when the air conditioner is in the heating mode), the standby second electronic expansion valve can be further started for opening degree control according to the frosting condition, which can effectively perform corresponding opening degree control according to different frosting conditions, improve the gas flow rate of the high-temperature gas flowing from the evaporator to the condenser, and can effectively defrost the condenser under different frosting conditions.

[0038] Furthermore, when the air conditioner is in the heating mode, the outdoor first coil temperature is monitored and compared with the first threshold and the second threshold respectively. When the outdoor first coil temperature is less than the first threshold and greater than the second threshold, the outdoor fan is controlled to enhance heat exchange to pre-defrost the condenser; and when the outdoor first coil temperature is less than or equal to the second threshold, the outdoor second coil temperature is detected and compared with the second threshold, and the opening degrees of the first electronic expansion valve and / or the second electronic expansion valve are controlled according to the comparison result to increase the gas flow rate from the evaporator to the condenser to defrost the condenser. Overall, it can effectively perform defrosting of the outdoor unit on the basis of the indoor unit not stopping and the indoor temperature difference changing little, improving the user comfort experience.

[0039] The following description Figure 1 Specific optional embodiments for each step when performing defrost control of the air conditioner in the following embodiments.

[0040] In one embodiment, referring to Figure 3 , the pre-defrosting of the condenser by controlling the outdoor fan to enhance heat exchange may include: Step S310, obtaining the rotation speed of the outdoor fan; Step S320, if the rotation speed is less than a predetermined rotation speed threshold, then the rotation speed of the outdoor fan is increased by control to enhance heat exchange for pre-defrosting the condenser.

[0041] The outdoor first coil temperature To is respectively compared with the first threshold T1 and the second threshold T2. If T2 < To < T1, it indicates that the temperature at the coil 220 near the upper part of the condenser 210 is relatively low, and there is a risk of frosting on the condenser. At this time, the outdoor fan in the outdoor unit is controlled to enhance heat exchange. When controlling the outdoor fan, first determine the current rotation speed Vwai of the outdoor fan, and compare this rotation speed Vwai with the predetermined rotation speed threshold V0.

[0042] If Vwai < V0, the speed of the first outdoor fan commonly used in the outdoor unit will be increased to enhance the air volume, thereby enhancing the heat exchange between the indoor and outdoor units and raising the temperature on one side of the outdoor unit. This allows for pre-defrosting of the condenser to prevent frost buildup on the condenser.

[0043] The speed of the first outdoor fan can be increased to a first predetermined value, which can be the maximum speed of the outdoor fan. After the outdoor fan has been running at the first predetermined value for a predetermined time, the real-time outdoor first coil temperature can be re-detected and compared with the first threshold and the second threshold to determine whether to re-execute the step of enhancing heat exchange by controlling the outdoor fan to pre-defrost the condenser.

[0044] Furthermore, in one embodiment, see [reference] Figure 3 The outdoor unit also includes a second outdoor fan; the method may further include: step S330, if the rotation speed is greater than or equal to a predetermined rotation speed threshold, then start the second outdoor fan, and enhance heat exchange by controlling the rotation speed of the outdoor fan and the second outdoor fan to pre-defrost the condenser.

[0045] If Vwai is greater than or equal to V0, it means that the current speed is already high but there is still a risk of frosting. In this case, the second outdoor fan in the outdoor unit is started, and the speed of the first and second outdoor fans is increased to further increase the air volume. This further enhances the heat exchange between the indoor and outdoor units and raises the temperature on one side of the outdoor unit, so as to pre-defrost the condenser and prevent condenser frosting.

[0046] The rotational speed of the first outdoor fan can be increased to a first predetermined value, which can be the maximum rotational speed of the outdoor fan. The rotational speed of the second outdoor fan can be increased to a second predetermined value, which can be the maximum rotational speed of the second outdoor fan. After the first and second outdoor fans have increased their rotational speeds and run for a predetermined period of time, the real-time outdoor first coil temperature can be re-detected and compared with a first threshold and a second threshold value to determine whether to re-execute the step of enhancing heat exchange by controlling the outdoor fans to pre-defrost the condenser.

[0047] In one embodiment, see Figure 4 The step of controlling the opening degree of the first electronic expansion valve and / or the second electronic expansion valve according to the comparison result to increase the gas flow rate from the evaporator to the condenser for defrosting the condenser may include:

[0048] Step S410: If the outdoor second coil temperature is less than or equal to the second threshold, the second electronic expansion valve is activated, and the opening of the first electronic expansion valve and the second electronic expansion valve are jointly controlled to increase the gas flow from the evaporator to the condenser, so as to defrost the condenser as a whole.

[0049] Step S420: If the outdoor second coil temperature is greater than the second threshold, control the opening of the second electronic expansion valve to increase the gas flow from the evaporator to the condenser, so as to defrost the upper part of the condenser.

[0050] Compare the outdoor second coil temperature Tk with the second threshold T2. If the comparison result shows that the outdoor second coil temperature Tk is less than or equal to the second threshold T2, it indicates that the temperature of the lower coil of the condenser is extremely low, and the entire condenser is covered with frost. Activate the second electronic expansion valve and, in conjunction with controlling the opening of the first and second electronic expansion valves, increase their respective openings. This significantly increases the flow rate of high-temperature gas from the evaporator to the condenser through the first and second passages, thereby effectively defrosting the entire condenser.

[0051] If the outdoor second coil temperature Tk is greater than the second threshold T2, it indicates that only the temperature of the upper coil of the condenser is extremely low, and only the upper part of the condenser is frosted. At this time, only the opening of the second electronic expansion valve is increased to increase the gas flow from the evaporator to the condenser, thereby effectively defrosting only the upper part of the condenser.

[0052] Furthermore, after controlling the opening of the second electronic expansion valve to increase the gas flow from the evaporator to the condenser for defrosting the upper part of the condenser, the method further includes: obtaining a first opening degree of the second electronic expansion valve after it is increased, and obtaining state parameters in the air conditioner to obtain a first state parameter; calculating a first target opening degree based on the first state parameter; controlling the second electronic expansion valve to increase to a second opening degree, and obtaining state parameters in the air conditioner to obtain a second state parameter; calculating a second target opening degree based on the second state parameter; and analyzing the first opening degree, the first target opening degree, the second opening degree, and the second target opening degree to obtain the effectiveness of the opening degree of the second electronic expansion valve.

[0053] If the outdoor second coil temperature Tk is greater than the second threshold T2, the opening of the second electronic expansion valve can be increased to the first opening K0. Furthermore, the state parameters of the air conditioner when the opening is increased to the first opening can be obtained as the first state parameter. Then, the second electronic expansion valve can be increased to the second opening Kb, and the state parameters of the air conditioner when the opening is increased to the second opening can be obtained as the second state parameter.

[0054] Using a preset formula or an opening degree calculation and analysis model, a first target opening degree Ka can be calculated based on a first state parameter, and a second target opening degree Ks can be calculated based on a second state parameter. Here, the first target opening degree Ka and the second target opening degree Ks are the target opening degrees matched to the air conditioner under the current state, calculated based on the state parameters. The preset formula can be set according to actual conditions, and the opening degree calculation and analysis model can be trained according to actual conditions; this application does not impose specific limitations on these aspects.

[0055] The effectiveness of the second electronic expansion valve's opening degree is determined by analyzing the first opening degree K0, the first target opening degree Ka, the second opening degree Kb, and the second target opening degree Ks. If the effectiveness is valid, it indicates that the current opening degree (i.e., the second opening degree) of the second electronic expansion valve is suitable for defrosting. If the effectiveness is invalid, it indicates that the current opening degree (i.e., the second opening degree) of the second electronic expansion valve is not suitable for defrosting, and the opening degree of the second electronic expansion valve can be further increased, and the effectiveness of the increased opening degree can be analyzed.

[0056] Furthermore, in one embodiment, the state parameters include exhaust temperature, exhaust pressure, outdoor coil temperature, indoor coil temperature, and suction pressure. The exhaust temperature can be the temperature of the compressor exhaust port, the exhaust pressure can be the pressure of the compressor exhaust port, the suction pressure can be the pressure of the compressor suction port, the outdoor coil temperature can include the detected outdoor first coil temperature and outdoor second coil temperature, and the indoor coil temperature is the detected indoor coil temperature, which is the coil temperature of the corresponding coil of the evaporator. The applicant found that calculating the target opening degree based on the exhaust temperature, exhaust pressure, outdoor coil temperature, indoor coil temperature, and suction pressure can effectively determine the effectiveness of the increased opening degree.

[0057] Furthermore, in one embodiment, the step of analyzing the first opening degree, the first target opening degree, the second opening degree, and the second target opening degree to obtain the validity of the second opening degree includes: subtracting the first opening degree from the first target opening degree to obtain a first opening degree difference; subtracting the second opening degree from the second target opening degree to obtain a second opening degree difference; subtracting the second opening degree difference from the first opening degree difference to obtain a target difference value; if the target difference value is less than a preset difference value threshold, the validity of the opening degree of the second electronic expansion valve is valid; if the target difference value is greater than or equal to the preset difference value threshold, the validity of the opening degree of the second electronic expansion valve is invalid.

[0058] Specifically, based on the first opening degree K0, the first target opening degree Ka, the second opening degree Kb, and the second target opening degree Ks, the target difference value can be calculated as [Ka-K0]-[Ks-Kb]. A preset difference threshold is X1. If [Ka-K0]-[Ks-Kb] < X1, the opening degree of the second electronic expansion valve is deemed valid; conversely, if [Ka-K0]-[Ks-Kb] ≥ X1, the opening degree of the second electronic expansion valve is deemed invalid.

[0059] Furthermore, if the outdoor first coil temperature To is greater than the first threshold T1, the outdoor first coil temperature can be re-detected after the air conditioner has been running normally for a certain period of time, and compared with the first threshold and the second threshold.

[0060] Furthermore, this application also provides a defrosting control device for an air conditioner, which can be applied to control equipment. For example... Figure 5 As shown, Figure 5 A block diagram of a defrosting control device for an air conditioner according to an embodiment of the present application is shown. Specifically, the defrosting control device 500 of the air conditioner may include a processor 501 with one or more processing cores and a memory 502 with one or more computer-readable storage media.

[0061] The processor 501 can load the executable files corresponding to the processes of one or more computer programs into the memory 502 according to instructions, and the processor 501 can run the computer programs stored in the memory 502 to realize the various functions in the aforementioned defrosting control method of the air conditioner in this application.

[0062] For example, processor 301 can perform the following steps: when the air conditioner is in heating mode, detect the outdoor first coil temperature, the outdoor first coil temperature being the coil temperature of the coil near the upper part of the condenser; if the outdoor first coil temperature is less than a first threshold and greater than a second threshold, control the outdoor fan to enhance heat exchange to pre-defrost the condenser; if the outdoor first coil temperature is less than or equal to the second threshold, detect the outdoor second coil temperature, the outdoor second coil temperature being the coil temperature of the coil near the lower part of the condenser; compare the outdoor second coil temperature with the second threshold, and control the opening of the first electronic expansion valve and / or the second electronic expansion valve according to the comparison result to increase the gas flow from the evaporator to the condenser to defrost the condenser, the second threshold being less than or equal to the second threshold.

[0063] In some embodiments of this application, controlling the opening of the first electronic expansion valve and / or the second electronic expansion valve according to the comparison result to increase the gas flow rate from the evaporator to the condenser for defrosting the condenser includes: if the outdoor second coil temperature is less than or equal to the second threshold, then activating the second electronic expansion valve and jointly controlling the opening of the first electronic expansion valve and the second electronic expansion valve to increase the gas flow rate from the evaporator to the condenser for overall defrosting of the condenser; if the outdoor second coil temperature is greater than the second threshold, then controlling the opening of the second electronic expansion valve to increase the gas flow rate from the evaporator to the condenser for upper defrosting of the condenser.

[0064] In some embodiments of this application, after controlling the opening of the second electronic expansion valve to increase the gas flow from the evaporator to the condenser for defrosting the upper part of the condenser, the method further includes: obtaining a first opening degree of the second electronic expansion valve after it has been increased, and obtaining state parameters in the air conditioner to obtain a first state parameter; calculating a first target opening degree based on the first state parameter; controlling the second electronic expansion valve to increase to a second opening degree, and obtaining state parameters in the air conditioner to obtain a second state parameter; calculating a second target opening degree based on the second state parameter; and analyzing the first opening degree, the first target opening degree, the second opening degree, and the second target opening degree to determine the effectiveness of the opening degree of the second electronic expansion valve.

[0065] In some embodiments of this application, the state parameters include exhaust temperature, exhaust pressure, outdoor coil temperature, indoor coil temperature, and intake pressure.

[0066] In some embodiments of this application, the step of analyzing the first opening degree, the first target opening degree, the second opening degree, and the second target opening degree to obtain the validity of the second opening degree includes: subtracting the first opening degree from the first target opening degree to obtain a first opening degree difference; subtracting the second opening degree from the second target opening degree to obtain a second opening degree difference; subtracting the second opening degree difference from the first opening degree difference to obtain a target difference value; if the target difference value is less than a preset difference value threshold, the validity of the opening degree of the second electronic expansion valve is valid; if the target difference value is greater than or equal to the preset difference value threshold, the validity of the opening degree of the second electronic expansion valve is invalid.

[0067] In some embodiments of this application, the step of enhancing heat exchange by controlling the external fan to pre-defrost the condenser includes: obtaining the rotational speed of the external fan; if the rotational speed is less than a predetermined rotational speed threshold, then enhancing heat exchange by controlling the external fan to pre-defrost the condenser.

[0068] In some embodiments of this application, the outdoor unit further includes a second outdoor fan; the method further includes: if the rotational speed is greater than or equal to a predetermined rotational speed threshold, then starting the second outdoor fan, and enhancing heat exchange by controlling the rotational speed of the outdoor fan and the second outdoor fan to pre-defrost the condenser.

[0069] Those skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be performed by a computer program, or by a computer program controlling related hardware. The computer program can be stored in a computer-readable storage medium and loaded and executed by a processor.

[0070] Therefore, embodiments of this application also provide a storage medium storing a computer program that can be loaded by a processor to execute the steps in any of the methods provided in embodiments of this application.

[0071] The storage medium can be a computer-readable storage medium, which may include: read-only memory (ROM), random access memory (RAM), disk or optical disk, etc.

[0072] Since the computer program stored in the storage medium can execute the steps of any of the methods provided in the embodiments of this application, the beneficial effects that the methods provided in the embodiments of this application can achieve can be realized. For details, please refer to the previous embodiments, which will not be repeated here.

[0073] In addition, see Figure 6 This application also provides an air conditioner, which 600 may include, for example, Figure 5 The air conditioner shown includes a defrost control device 500 and other air conditioner modules 700 (such as indoor and outdoor units). It is understood that the air conditioner can be a wall-mounted air conditioner, a floor-standing air conditioner, or other types of air conditioners.

[0074] According to another embodiment of this application, a computer program product or computer program includes computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the computer device to perform the methods provided in the various optional implementations described in the embodiments of this application.

[0075] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein.

[0076] It should be understood that this application is not limited to the embodiments described above and shown in the accompanying drawings, but various modifications and changes can be made without departing from its scope.

Claims

1. A defrosting control method for an air conditioner, characterized in that, The air conditioner includes an indoor unit and an outdoor unit. The indoor unit includes an evaporator, and the outdoor unit includes an outdoor fan and a condenser. The evaporator and the condenser have parallel first and second passages. A first electronic expansion valve for operation is provided in the first passage, and a second electronic expansion valve for standby is provided in the second passage. The method includes: When the air conditioner is in heating mode, the temperature of the first outdoor coil is detected. The temperature of the first outdoor coil is the temperature of the coil near the top of the condenser. If the outdoor first coil temperature is less than the first threshold and greater than the second threshold, the outdoor fan is controlled to enhance heat exchange in order to pre-defrost the condenser. If the outdoor first coil temperature is less than or equal to the second threshold, then the outdoor second coil temperature is detected. The outdoor second coil temperature is the coil temperature of the coil near the bottom of the condenser. The outdoor second coil temperature is compared with a second threshold, and the opening of the first electronic expansion valve and / or the second electronic expansion valve is controlled according to the comparison result to increase the gas flow from the evaporator to the condenser to defrost the condenser; The step of controlling the opening degree of the first electronic expansion valve and / or the second electronic expansion valve according to the comparison result to increase the gas flow rate from the evaporator to the condenser for defrosting the condenser includes: If the outdoor second coil temperature is greater than the second threshold, the opening of the second electronic expansion valve is increased to increase the gas flow from the evaporator to the condenser, so as to defrost the upper part of the condenser. After increasing the opening of the second electronic expansion valve to increase the gas flow from the evaporator to the condenser for upper defrosting of the condenser, the method further includes: The first opening degree of the second electronic expansion valve after it is raised is obtained, and the state parameters in the air conditioner are obtained to obtain the first state parameters; The first target opening degree is calculated based on the first state parameters; Control the second electronic expansion valve to raise it to the second opening degree, and obtain the status parameters in the air conditioner to obtain the second status parameters; The second target opening degree is calculated based on the second state parameters; The effectiveness of the opening degree of the second electronic expansion valve is obtained by analyzing the first opening degree, the first target opening degree, the second opening degree, and the second target opening degree, so as to adjust the opening degree of the second electronic expansion valve according to the effectiveness.

2. The method according to claim 1, characterized in that, The step of controlling the opening of the first electronic expansion valve and / or the second electronic expansion valve according to the comparison result to increase the gas flow rate from the evaporator to the condenser for defrosting the condenser further includes: If the outdoor second coil temperature is less than or equal to the second threshold, the second electronic expansion valve is activated, and the opening degree of the first electronic expansion valve and the second electronic expansion valve are jointly controlled to increase the gas flow from the evaporator to the condenser, so as to defrost the condenser as a whole.

3. The method according to claim 1, characterized in that, The status parameters include exhaust temperature, exhaust pressure, outdoor coil temperature, indoor coil temperature, and intake pressure.

4. The method according to claim 1, characterized in that, The step of analyzing the first opening degree, the first target opening degree, the second opening degree, and the second target opening degree to determine the effectiveness of the second opening degree includes: Subtract the first opening from the first target opening to obtain the first opening difference; Subtract the second opening from the second target opening to obtain the second opening difference; Subtracting the second opening difference from the first opening difference yields the target difference. If the target difference is less than the preset difference threshold, then the opening of the second electronic expansion valve is valid. If the target difference is greater than or equal to a preset difference threshold, the opening of the second electronic expansion valve is invalid.

5. The method according to claim 1, characterized in that, The method of enhancing heat exchange by controlling the external fan to pre-defrost the condenser includes: Obtain the rotational speed of the external fan; If the rotational speed is less than a predetermined speed threshold, the external fan is controlled to increase its speed to enhance heat exchange and pre-defrost the condenser.

6. The method according to claim 5, characterized in that, The outdoor unit also includes a second external fan; the method further includes: If the rotational speed is greater than or equal to a predetermined rotational speed threshold, the second external fan is started, and the rotational speed of the external fan and the second external fan is increased to enhance heat exchange in order to pre-defrost the condenser.

7. A defrosting control device for an air conditioner, characterized in that, include: Memory, which stores computer programs; A processor reads a computer program stored in memory to perform the method described in any one of claims 1 to 6.

8. A storage medium, characterized in that, It stores a computer program that, when executed by the computer's processor, causes the computer to perform the method described in any one of claims 1 to 6.

9. An air conditioner, characterized in that, Includes the defrosting control device for the air conditioner as described in claim 7.

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