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 cooling mode, detecting the indoor coil temperature; if the indoor coil temperature is less than a first threshold and greater than a second threshold, controlling the outdoor fan to increase the temperature of the gas flowing from the condenser to the evaporator to defrost the evaporator; if the indoor coil temperature is less than or equal to the second threshold, activating the second electronic expansion valve, and jointly controlling the opening of the first and second electronic expansion valves to increase the gas flow rate from the condenser to the evaporator to defrost the evaporator. This application can effectively defrost the indoor unit without stopping the indoor unit and with minimal indoor temperature changes, 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 cooling mode, the evaporator in the indoor unit may freeze due to frost buildup for various reasons. Therefore, air conditioners usually use cooling anti-freeze to defrost. Conventional air conditioners use frequency reduction or shutdown control to achieve the defrosting requirement. However, this method can easily cause frequent start-stop 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 indoor 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 cooling mode, detecting the indoor coil temperature, which is the coil temperature of the corresponding coil of the evaporator; if the indoor coil temperature is less than a first threshold and greater than a second threshold, controlling the outdoor fan to increase the temperature of the gas flowing from the condenser to the evaporator to defrost the evaporator; if the indoor coil temperature is less than or equal to the second threshold, activating the second electronic expansion valve, and increasing the gas flow rate from the condenser to the evaporator by jointly controlling the opening of the first and second electronic expansion valves to defrost the evaporator.

[0006] In some embodiments of this application, the step of increasing the gas flow rate from the condenser to the evaporator to defrost the evaporator by jointly controlling the opening of the first electronic expansion valve and the second electronic expansion valve 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 adjusting the opening degree of the second electronic expansion valve based on the first opening degree, the first target opening degree, the second opening degree, and the second target opening degree.

[0007] In some embodiments of this application, adjusting the opening of the second electronic expansion valve according to the first opening degree, the first target opening degree, the second opening degree, and the second target opening degree includes: determining the validity of the opening of the second electronic expansion valve according to the first opening degree, the first target opening degree, the second opening degree, and the second target opening degree; and adjusting the opening of the second electronic expansion valve according to the validity.

[0008] In some embodiments of this application, determining the validity of the opening of the second electronic expansion valve based on the first opening degree, the first target opening degree, the second opening degree, and the second target 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 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 of the second electronic expansion valve is invalid.

[0009] In some embodiments of this application, the state parameters include exhaust temperature, exhaust pressure, outdoor coil temperature, indoor coil temperature, and intake pressure.

[0010] In some embodiments of this application, the step of defrosting the evaporator by controlling the external fan to increase the temperature of the gas flowing from the condenser to the evaporator includes: obtaining the rotational speed of the external fan; if the rotational speed is less than a predetermined rotational speed threshold, then controlling the external fan to reverse and increase the temperature of the gas flowing from the condenser to the evaporator to defrost the evaporator.

[0011] In some embodiments of this application, the method further includes: if the rotational speed is greater than the predetermined rotational speed threshold, then by controlling the external fan to reduce the rotational speed to increase the temperature of the gas flowing from the condenser to the evaporator, so as to defrost the evaporator.

[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 the defrosting control device of the air conditioner described in the embodiments of this application.

[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 cooling mode, detecting the indoor coil temperature, which is the coil temperature of the corresponding coil of the evaporator; if the indoor coil temperature is less than a first threshold and greater than a second threshold, controlling the outdoor fan to increase the temperature of the gas flowing from the condenser to the evaporator to defrost the evaporator; if the indoor coil temperature is less than or equal to the second threshold, activating the second electronic expansion valve, and increasing the gas flow rate from the condenser to the evaporator by jointly controlling the opening of the first and second electronic expansion valves to defrost the evaporator.

[0017] In this way, when the air conditioner is in cooling mode, the indoor coil temperature is monitored and compared with a first threshold and a second threshold. When the indoor coil temperature is lower than the first threshold but higher than the second threshold, the outdoor fan is controlled to increase the temperature of the gas flowing from the condenser to the evaporator to defrost the evaporator. Furthermore, when the indoor coil temperature is lower than or equal to the second threshold, a second electronic expansion valve is activated in addition to the already activated first electronic expansion valve. The opening degrees of the first and second electronic expansion valves are jointly controlled to increase the gas flow from the condenser to the evaporator to defrost the evaporator. Overall, this method can effectively defrost the indoor unit without stopping it and with minimal changes in indoor temperature, 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 defrosting control flowchart according to an embodiment of this application is shown.

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

[0022] Figure 4 A block diagram of a defrosting control device for an air conditioner according to an embodiment of this application is shown.

[0023] Figure 5 A block diagram of an air conditioner according to one embodiment of this application is shown. Detailed Implementation

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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 cooling 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.

[0031] As Figure 1 shown, the defrost control method of the air conditioner may include steps S110 to S130.

[0032] Step S110, when the air conditioner is in the cooling mode, detect the indoor coil temperature, where the indoor coil temperature is the coil temperature of the coil corresponding to the evaporator; Step S120, if the indoor coil temperature is less than the first threshold and greater than the second threshold, then control the external blower to increase the gas temperature flowing from the condenser to the evaporator to defrost the evaporator; Step S130, if the indoor coil temperature is less than or equal to the second threshold, then start the second electronic expansion valve, and jointly control the opening degrees of the first electronic expansion valve and the second electronic expansion valve to increase the gas flow rate flowing from the condenser to the evaporator to defrost the evaporator.

[0033] For the evaporator of the indoor unit of the air conditioner, an indoor coil temperature sensor may be provided on the coil corresponding to the evaporator. When the air conditioner is in the cooling mode, the indoor coil temperature Ti can be detected through this indoor coil temperature sensor, and this indoor coil temperature is the coil temperature of the coil corresponding to the evaporator.

[0034] The first threshold T1 and the second threshold T2 are preset in advance, and the indoor coil temperature Ti is compared with the first threshold T1 and the second threshold T2 respectively. If T2 < Ti < T1, it means that the temperature of the coil corresponding to the indoor evaporator is relatively low, and a thin layer of frost begins to form on the surface of the evaporator. At this time, by controlling the external blower in the outdoor unit, the gas temperature flowing from the condenser to the evaporator is increased, so that the evaporator can be defrosted.

[0035] Furthermore, if Ti is less than or equal to T2, it means that the temperature of the coil corresponding to the indoor evaporator is extremely low and the evaporator is thickly frosted. At this time, on the basis of the first electronic expansion valve for operation (which has been started when the air conditioner operates in the heating mode), the backup second electronic expansion valve is further started, and by jointly controlling the opening degrees of the first electronic expansion valve and the second electronic expansion valve, the gas flow rate flowing from the condenser to the evaporator is increased through the first passage and the second passage, so that the evaporator can be effectively defrosted.

[0036] Furthermore, when the air conditioner is in the cooling mode, monitor the indoor coil temperature and compare it with the first threshold and the second threshold respectively. When the indoor coil temperature is less than the first threshold and greater than the second threshold, defrost the evaporator by controlling the outdoor fan to increase the gas temperature flowing from the condenser to the evaporator; and when the indoor coil temperature is less than or equal to the second threshold, further start the second electronic expansion valve based on the already started first electronic expansion valve for working, jointly control the opening degrees of the first electronic expansion valve and the second electronic expansion valve, and increase the gas flow rate flowing from the condenser to the evaporator to defrost the evaporator, which can effectively defrost the indoor unit on the basis of the indoor unit not stopping and the indoor temperature difference changing little, and improve the user comfort experience.

[0037] The following description Figure 1 Specific embodiments that are further optional under each step when performing defrost control of the air conditioner in the following embodiments.

[0038] In one embodiment, refer to Figure 2 , the defrosting of the evaporator by controlling the outdoor fan to increase the gas temperature flowing from the condenser to the evaporator includes: Step S210, obtain the rotational speed of the outdoor fan; Step S220, if the rotational speed is less than the predetermined rotational speed threshold, then reverse the outdoor fan to increase the gas temperature flowing from the condenser to the evaporator to defrost the evaporator.

[0039] Compare the indoor coil temperature Ti with the first threshold T1 and the second threshold T2. If T2 < Ti < T1, it indicates that the temperature of the coil corresponding to the indoor evaporator is relatively low, and a thin layer of frost begins to form on the surface of the evaporator. At this time, control the outdoor fan in the outdoor unit to increase the gas temperature flowing from the condenser to the evaporator.

[0040] Specifically, when controlling the outdoor fan, first determine the current rotational speed Vwai of the outdoor fan, and compare this rotational speed Vwai with the predetermined rotational speed threshold V0. If Vwai < V0, it indicates that the rotational speed of the outdoor fan is already very small, and control the outdoor fan to reverse. The reverse rotation of the outdoor fan makes the condenser not exchange heat with the ambient temperature, increases the outlet temperature of the condenser, thereby increasing the gas temperature flowing from the condenser to the evaporator, and increasing the indoor-side temperature. Thus, the evaporator can be defrosted.

[0041] After the outdoor fan rotates in reverse for a predetermined duration, the real-time indoor coil temperature Ti can be detected again and compared with the first threshold and the second threshold, and it is determined whether to re-execute the step of increasing the gas temperature flowing from the condenser to the evaporator to defrost the evaporator.

[0042] Further, refer to Figure 2In one embodiment, the method further includes step S230: if the rotation speed is greater than the predetermined rotation speed threshold, then the external fan is controlled to reduce its rotation speed to increase the temperature of the gas flowing from the condenser to the evaporator, so as to defrost the evaporator.

[0043] If Vwai≥V0, it indicates that the speed of the outdoor fan is not very small. The control is to reduce the speed of the outdoor fan. The reduced speed of the outdoor fan reduces the air volume provided, which increases the temperature at the condenser outlet. This increases the temperature of the gas flowing from the condenser to the evaporator, thereby raising the indoor temperature and enabling defrosting of the evaporator.

[0044] In one embodiment, see Figure 3 The step of increasing the gas flow rate from the condenser to the evaporator by jointly controlling the opening of the first electronic expansion valve and the second electronic expansion valve to defrost the evaporator may include:

[0045] Step S310: Obtain the first opening degree of the second electronic expansion valve after it is raised, and obtain the state parameters in the air conditioner to obtain the first state parameters; Step S320: Calculate the first target opening degree based on the first state parameters; Step S330: Control the second electronic expansion valve to raise to the second opening degree, and obtain the state parameters in the air conditioner to obtain the second state parameters; Step S340: Calculate the second target opening degree based on the second state parameters; Step S350: Adjust the opening degree of the second electronic expansion valve based on the first opening degree, the first target opening degree, the second opening degree, and the second target opening degree.

[0046] If the indoor coil temperature Ti is less than or equal to the second threshold T2, the standby second electronic expansion valve is activated in addition to the first electronic expansion valve in operation (which is already activated when the air conditioner is in heating mode), and the opening degrees of the first and second electronic expansion valves are jointly controlled. Specifically, when jointly controlling the opening degrees of the first and second electronic expansion valves, the opening degree of the first electronic expansion valve can be kept constant while the opening degree of the second electronic expansion valve is increased to the first opening degree K0; alternatively, the opening degree of the first electronic expansion valve can be increased, and the opening degree of the second electronic expansion valve can also be increased to the first opening degree K0.

[0047] Furthermore, the state parameters of the air conditioner when it is raised to the first opening degree can be obtained as the first state parameter. Then, the second electronic expansion valve can be controlled to be raised to the second opening degree Kb, and the state parameters of the air conditioner when it is raised to the second opening degree can be obtained as the second state parameter.

[0048] 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.

[0049] 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 opening degree of the second electronic expansion valve can be further effectively adjusted to a suitable opening degree.

[0050] In one embodiment, adjusting the opening of the second electronic expansion valve according to the first opening degree, the first target opening degree, the second opening degree, and the second target opening degree may include: determining the validity of the opening of the second electronic expansion valve according to the first opening degree, the first target opening degree, the second opening degree, and the second target opening degree; and adjusting the opening of the second electronic expansion valve according to the validity.

[0051] Based on the first opening degree, the first target opening degree, the second opening degree, and the second target opening degree, the validity of the opening degree of the second electronic expansion valve is determined. If the validity is valid, it means that the current opening degree of the second electronic expansion valve (i.e., the second opening degree) is suitable for defrosting. If the validity is invalid, it means that the current opening degree of the second electronic expansion valve (i.e., the second opening degree) is not suitable for defrosting, and the opening degree of the second electronic expansion valve can be further increased, and the validity of the increased opening degree can be analyzed.

[0052] In one embodiment, determining the validity of the opening degree of the second electronic expansion valve based on the first opening degree, the first target opening degree, the second opening degree, and the second target opening degree includes:

[0053] Subtracting the first opening from the first target opening yields a first opening difference; subtracting the second opening from the second target opening yields a second opening difference; subtracting the second opening difference from the first opening difference yields a target difference value; if the target difference value is less than a preset difference threshold, the opening of the second electronic expansion valve is valid; if the target difference value is greater than or equal to the preset difference threshold, the opening of the second electronic expansion valve is invalid.

[0054] 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.

[0055] 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 discovered that calculating the target opening degree based on the exhaust temperature, exhaust pressure, outdoor coil temperature, indoor coil temperature, and suction pressure, and using the target opening degree, can effectively determine the effectiveness of the increased opening degree and adjust the opening degree of the second electronic expansion valve.

[0056] Furthermore, this application also provides a defrosting control device for an air conditioner, which can be applied to control equipment. For example... Figure 4 As shown, Figure 4 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 400 of the air conditioner may include a processor 401 with one or more processing cores and a memory 402 with one or more computer-readable storage media.

[0057] The processor 401 can load the executable files corresponding to the processes of one or more computer programs into the memory 402 according to instructions, and the processor 401 can run the computer programs stored in the memory 402 to realize the various functions in the aforementioned embodiments of the defrosting control method for air conditioners of this application.

[0058] For example, processor 401 can perform the following steps: when the air conditioner is in cooling mode, detect the indoor coil temperature, which is the coil temperature of the corresponding coil of the evaporator; if the indoor coil temperature is less than a first threshold and greater than a second threshold, control the outdoor fan to increase the temperature of the gas flowing from the condenser to the evaporator to defrost the evaporator; if the indoor coil temperature is less than or equal to the second threshold, activate the second electronic expansion valve, and increase the gas flow rate from the condenser to the evaporator by jointly controlling the opening of the first and second electronic expansion valves to defrost the evaporator.

[0059] In some embodiments of this application, the step of increasing the gas flow rate from the condenser to the evaporator to defrost the evaporator by jointly controlling the opening of the first electronic expansion valve and the second electronic expansion valve 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 adjusting the opening degree of the second electronic expansion valve based on the first opening degree, the first target opening degree, the second opening degree, and the second target opening degree.

[0060] In some embodiments of this application, adjusting the opening of the second electronic expansion valve according to the first opening degree, the first target opening degree, the second opening degree, and the second target opening degree includes: determining the validity of the opening of the second electronic expansion valve according to the first opening degree, the first target opening degree, the second opening degree, and the second target opening degree; and adjusting the opening of the second electronic expansion valve according to the validity.

[0061] In some embodiments of this application, determining the validity of the opening of the second electronic expansion valve based on the first opening degree, the first target opening degree, the second opening degree, and the second target 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 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 of the second electronic expansion valve is invalid.

[0062] In some embodiments of this application, the state parameters include exhaust temperature, exhaust pressure, outdoor coil temperature, indoor coil temperature, and intake pressure.

[0063] In some embodiments of this application, the step of defrosting the evaporator by controlling the external fan to increase the temperature of the gas flowing from the condenser to the evaporator includes: obtaining the rotational speed of the external fan; if the rotational speed is less than a predetermined rotational speed threshold, then controlling the external fan to reverse and increase the temperature of the gas flowing from the condenser to the evaporator to defrost the evaporator.

[0064] In some embodiments of this application, the method further includes: if the rotational speed is greater than the predetermined rotational speed threshold, then by controlling the external fan to reduce the rotational speed to increase the temperature of the gas flowing from the condenser to the evaporator, so as to defrost the evaporator.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] In addition, see Figure 5 This application embodiment also provides an air conditioner, the air conditioner 500 may include, for example, Figure 5 The air conditioner shown includes a defrost control device 400 and other air conditioner modules 600 (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.

[0070] 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.

[0071] 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.

[0072] 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 cooling mode, the indoor coil temperature is detected, and the indoor coil temperature is the coil temperature of the corresponding coil of the evaporator. If the indoor coil temperature is less than a first threshold and greater than a second threshold, the temperature of the gas flowing from the condenser to the evaporator is increased by controlling the outdoor fan to defrost the evaporator; If the indoor coil temperature is less than or equal to the second threshold, the second electronic expansion valve is activated, and the opening of the first and second electronic expansion valves is jointly controlled to increase the gas flow from the condenser to the evaporator to defrost the evaporator. The method of jointly controlling the opening of the first electronic expansion valve and the second electronic expansion valve to increase the gas flow from the condenser to the evaporator for defrosting the evaporator 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 opening of the second electronic expansion valve is adjusted according to the first opening degree, the first target opening degree, the second opening degree, and the second target opening degree.

2. The method according to claim 1, characterized in that, The step of adjusting the opening of the second electronic expansion valve according to the first opening degree, the first target opening degree, the second opening degree, and the second target opening degree includes: The effectiveness of the opening degree of the second electronic expansion valve is determined based on the first opening degree, the first target opening degree, the second opening degree, and the second target opening degree. Adjust the opening degree of the second electronic expansion valve according to the effectiveness.

3. The method according to claim 2, characterized in that, The step of determining the validity of the opening degree of the second electronic expansion valve based on the first opening degree, the first target opening degree, the second opening degree, and the second target 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.

4. 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.

5. The method according to claim 1, characterized in that, The step of defrosting the evaporator by controlling the external fan to increase the temperature of the gas flowing from the condenser to the evaporator 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 reverse and increase the temperature of the gas flowing from the condenser to the evaporator to defrost the evaporator.

6. The method according to claim 5, characterized in that, The method further includes: If the rotational speed is greater than the predetermined rotational speed threshold, the external fan is controlled to reduce its rotational speed to increase the temperature of the gas flowing from the condenser to the evaporator, thereby defrosting the evaporator.

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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