Air conditioner and control method thereof

Abstract

The invention provides an air conditioner and a control method thereof.The control method of the air conditioner comprises the steps that when the air conditioner is in a heating mode and at least one floor heating heat exchanger is in a non-working state, whether the air conditioner is in a refrigerant lacking state or not is judged; if yes, the four-way valve is controlled to reverse, and a switching valve between the floor heating heat exchanger in the non-working state and the four-way valve is controlled to be opened, so that the floor heating heat exchanger in the non-working state communicates with an air suction port of the compressor. According to the control method of the air conditioner, the refrigerant accumulated in the floor heating heat exchanger in the non-working state can flow back to the compressor, the problem that the air conditioner is lack of the refrigerant is solved, and the heating effect of the air conditioner is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and in particular to an air conditioner and a control method thereof. Background Art

[0002] With the improvement of people's living standards, air conditioners have become an indispensable household appliance in people's daily lives, among which multi-split air conditioners are widely used in households. Multi-split air conditioners have the functions of heating and floor heating. The air conditioner in the related art includes a compressor, a four-way valve, an outdoor heat exchanger, and a plurality of floor heating heat exchangers arranged in parallel with the indoor heat exchanger to achieve the floor heating function through the multiple floor heating heat exchangers. However, when the multiple floor heating heat exchangers are not all in working condition, some refrigerant will accumulate in the floor heating heat exchangers that are not in working condition, resulting in insufficient refrigerant in the refrigerant circulation system of the air conditioner, causing the problem of poor heating effect. Summary of the Invention

[0003] In view of the above problems, the present invention is proposed to provide an air conditioner and a control method thereof that overcome the above problems or at least partially solve the above problems.

[0004] One purpose of the present invention is to solve the problem in the related art that refrigerant accumulates in the floor heating heat exchanger of the air conditioner in a non-working state, causing the air conditioner to be short of refrigerant, so as to improve the heating effect of the air conditioner.

[0005] Specifically, the present invention provides a control method for an air conditioner.

[0006] The invention also provides an air conditioner.

[0007] The control method of the air conditioner of the present invention comprises a compressor, a four-way valve, an outdoor heat exchanger, an indoor heat exchanger and a plurality of floor heating heat exchangers arranged in parallel with the indoor heat exchanger, and a switch valve is provided between an opening at one end of each of the floor heating heat exchangers and the four-way valve; the control method of the air conditioner comprises: when the air conditioner is in a heating mode and when at least one of the floor heating heat exchangers is in a non-working state, determining whether the air conditioner is in a refrigerant-deficient state; if so, controlling the four-way valve to reverse, and controlling the switch valve between the non-working floor heating heat exchanger and the four-way valve to open, so that the non-working floor heating heat exchanger is connected to the air intake of the compressor.

[0008] In some embodiments, the control of opening the switch valve between the floor heating heat exchanger in a non-working state and the four-way valve includes: obtaining the exhaust temperature of the compressor and the return water temperature of the floor heating heat exchanger in a working state; judging whether the difference between the exhaust temperature and the return water temperature is greater than or equal to a first preset temperature difference based on the exhaust temperature and the return water temperature; if so, controlling all the switch valves between the floor heating heat exchanger in a non-working state and the four-way valve to be opened; if not, controlling a part of the switch valves between the floor heating heat exchanger in a non-working state and the four-way valve to be opened.

[0009] In some embodiments, determining whether the air conditioner is in a refrigerant deficiency state comprises: obtaining operating parameters of the air conditioner; determining whether the operating parameters meet preset conditions; and if so, determining that the air conditioner is in the refrigerant deficiency state. In some embodiments, the air conditioner further comprises an outdoor unit, and the operating parameters comprise the exhaust temperature of the compressor, the return water temperature of the floor heating heat exchanger, the opening of the electronic expansion valve of the outdoor unit, and the indoor temperature; the preset conditions comprise: the difference between the exhaust temperature of the compressor and the return water temperature of the floor heating heat exchanger in operation is greater than a second preset temperature difference; the opening of the electronic expansion valve of the outdoor unit is greater than a first preset opening; and the difference between the return water temperature of the floor heating heat exchanger in operation and the indoor temperature is greater than a third preset temperature difference.

[0010] In some embodiments, after the switch valve between the floor heating heat exchanger in the non-working state and the four-way valve is opened, the method further includes:

[0011] After a first preset time interval, the four-way valve is controlled to be reversed again; and the switch valve between the floor heating heat exchanger in a non-working state and the four-way valve is controlled to be closed.

[0012] In some embodiments, when it is determined that the air conditioner is in a refrigerant shortage state, and before controlling the switching of the four-way valve, it also includes reducing the operating frequency of the compressor.

[0013] In some embodiments, after controlling the reversal of the four-way valve again, the method further includes controlling the operating frequency of the compressor to return to the state before the operating frequency was reduced.

[0014] In some embodiments, the other end of the floor heating heat exchanger is connected to an expansion valve; when it is determined that the air conditioner is in a refrigerant-deficient state, the control method of the air conditioner also includes: controlling the opening of the expansion valve connected to the other end of the floor heating heat exchanger in a non-working state to be at a minimum opening.

[0015] In some embodiments, when it is determined that the air conditioner is in a refrigerant-deficient state, before the switch valve between the floor heating heat exchanger in a non-working state and the four-way valve is controlled to open, it also includes: controlling the switch valve between the floor heating heat exchanger in a non-working state and the four-way valve to open; and controlling the opening of the expansion valve to increase to a second preset opening to allow the refrigerant to enter the floor heating heat exchanger in a non-working state; after a second preset time interval, controlling the switch valve between the floor heating heat exchanger in a non-working state and the four-way valve to close.

[0016] The air conditioner of the present invention includes a memory, a processor, and a computer program stored in the memory. The processor executes the computer program to implement the steps of any one of the above-mentioned air conditioner control methods.

[0017] The control method for an air conditioner according to an embodiment of the present invention controls, upon determining that the air conditioner is in a refrigerant deficiency state, a four-way valve to be reversed and an on-off valve between a non-operating floor heating heat exchanger and the four-way valve to be opened. One end of the non-operating floor heating heat exchanger is connected to the air intake of the compressor, and the expansion valve at the other end of the non-operating floor heating heat exchanger remains in its previous state, preventing refrigerant from entering the non-operating floor heating heat exchanger. The compressor then draws out the accumulated refrigerant and returns it to the compressor, thereby resolving the refrigerant deficiency problem and improving the heating efficiency of the air conditioner.

[0018] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0020] Figure 1 is a schematic flow chart of a method for controlling an air conditioner according to an embodiment of the present invention;

[0021] Figure 2 is a schematic flow chart of a method for controlling an air conditioner according to an embodiment of the present invention;

[0022] Figure 3 is a schematic flow chart of a method for controlling an air conditioner according to an embodiment of the present invention;

[0023] Figure 4 is a schematic flow chart of a method for controlling an air conditioner according to an embodiment of the present invention;

[0024] Figure 5 is a schematic flow chart of a method for controlling an air conditioner according to an embodiment of the present invention;

[0025] Figure 6 is a schematic flow chart of a method for controlling an air conditioner according to an embodiment of the present invention;

[0026] Figure 7 is a schematic flow chart of a method for controlling an air conditioner according to an embodiment of the present invention;

[0027] Figure 8 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention;

[0028] Figure 9 1 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention.

[0029] Reference numerals:

[0030] Air conditioner 10 ; processor 100 ; memory 200 ; computer program 210 ; indoor heat exchanger 300 ; floor heating heat exchanger 400 ; on-off valve 410 ; expansion valve 420 . DETAILED DESCRIPTION

[0031] Refer to the following Figures 1 to 9 To describe the air conditioner and the control method thereof according to the embodiment of the present invention. In the description of this embodiment, it should be understood that the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features, that is, include one or more of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. When a feature "includes or contains" one or some of the features it covers, unless otherwise specifically described, this indicates that other features are not excluded and may further include other features.

[0032] Unless otherwise expressly defined or limited, terms such as "disposed," "installed," "connected," "connected," "fixed," and "coupled" should be broadly interpreted. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two elements or interaction between two elements, unless otherwise expressly defined. A person of ordinary skill in the art should be able to understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0033] In addition, in the description of this embodiment, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact via another feature between them. That is, in the description of this embodiment, the first feature being "above," "above," and "above" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature being "below," "below," or "below" the second feature may mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] In the description of the present embodiment, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the exemplary expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any appropriate manner in any one or more embodiments or examples.

[0035] like Figure 8 As shown, the air conditioner 10 according to the embodiment of the present invention includes a compressor, a four-way valve, an indoor heat exchanger 300, and multiple floor heating heat exchangers 400 arranged in parallel with the indoor heat exchanger 300. An on-off valve 410 is provided between one end opening of each floor heating heat exchanger 400 and the four-way valve, and an expansion valve 420 is connected to the other end of the floor heating heat exchanger 400. The air conditioner 10 also includes a gas-liquid separator, an outdoor unit, an outdoor heat exchanger, and an electronic expansion valve corresponding to the outdoor unit.

[0036] When the air conditioner 10 of the embodiment of the present invention is in the floor heating mode, the refrigerant can enter the compressor after passing through the gas-liquid separator. The compressor can compress the low-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant. The high-temperature, high-pressure gaseous refrigerant can pass through the four-way valve and reach the floor heating heat exchanger 400. The floor heating heat exchanger 400 can condense the high-temperature, high-pressure gaseous refrigerant and release heat to become a medium-temperature, high-pressure liquid refrigerant, thereby releasing heat to the room and achieving a heating effect. Then, the medium-temperature, high-pressure liquid refrigerant can be converted into a low-temperature, low-pressure liquid refrigerant after passing through the electronic expansion valve of the outdoor unit. After that, the low-temperature, low-pressure liquid refrigerant evaporates and absorbs heat through the outdoor heat exchanger to become a low-temperature, low-pressure gaseous refrigerant. Finally, the low-temperature, low-pressure gaseous refrigerant returns to the compressor.

[0037] It will be appreciated that when the air conditioner 10 of this embodiment is in heating mode, the compressor exhaust port is connected to one end of the multiple floor heating heat exchangers 400. Specifically, when the floor heating heat exchangers 400 are in operation, the on-off valve 410 between them and the four-way valve is open, allowing high-temperature, high-pressure gaseous refrigerant to enter the floor heating heat exchangers 400. When the floor heating heat exchangers 400 are in non-operating mode, the on-off valve 410 between them and the four-way valve is closed, preventing high-temperature, high-pressure gaseous refrigerant from entering the floor heating heat exchangers 400.

[0038] The following describes a method for controlling the air conditioner 10 according to an embodiment of the present invention with reference to the accompanying drawings.

[0039] like Figure 1 As shown, and reference Figure 2-Figure 7 The control method of the air conditioner 10 according to the embodiment of the present invention includes the following steps:

[0040] S100 : When the air conditioner 10 is in a heating mode and at least one floor heating heat exchanger 400 is in a non-operating state, determine whether the air conditioner 10 is in a refrigerant shortage state.

[0041] S200: If yes, control the four-way valve to reverse, and control the switch valve 410 between the non-working floor heating heat exchanger 400 and the four-way valve to open, so that the non-working floor heating heat exchanger 400 is connected to the air intake of the compressor.

[0042] That is, after determining that the air conditioner 10 of this embodiment is in a refrigerant deficiency state, the four-way valve is reversed, and the on-off valve 410 between the non-operating floor heating heat exchanger 400 and the four-way valve is opened, so that the air intake of the compressor is connected to one end of the non-operating floor heating heat exchanger 400, thereby sucking out the refrigerant accumulated in the non-operating floor heating heat exchanger 400 and returning the accumulated refrigerant to the compressor. In addition, because the expansion valve 420 at the other end of the non-operating floor heating heat exchanger 400 maintains its previous state (for example, the expansion valve 420 is at its minimum opening), refrigerant no longer enters the non-operating floor heating heat exchanger 400.

[0043] Compared to the related art, the control method of the air conditioner 10 according to the embodiment of the present invention controls the four-way valve to reverse direction after determining that the air conditioner 10 is in a refrigerant-deficient state, and controls the on-off valve 410 between the non-operating floor heating heat exchanger 400 and the four-way valve to open. One end of the non-operating floor heating heat exchanger 400 is connected to the air intake of the compressor, and the expansion valve 420 at the other end of the non-operating floor heating heat exchanger 400 remains in its previous state, preventing refrigerant from entering the non-operating floor heating heat exchanger 400. The compressor then draws out the accumulated refrigerant and returns it to the compressor, thereby resolving the refrigerant-deficient problem in the air conditioner 10 and improving the heating effect of the air conditioner 10.

[0044] In some embodiments, as Figure 2 As shown, step S200 controls the on-off valve 410 between the floor heating heat exchanger 400 and the four-way valve in the non-working state to open, including the following steps:

[0045] S210: Obtain the exhaust temperature of the compressor and the return water temperature of the working floor heating heat exchanger 400. The exhaust temperature of the compressor and the return water temperature of the working floor heating heat exchanger 400 can be obtained by respectively providing temperature sensors at the exhaust port of the compressor and on the floor heating heat exchanger 400.

[0046] S220: Determine, based on the exhaust temperature and the return water temperature, whether the difference between the exhaust temperature and the return water temperature is greater than or equal to a first preset temperature difference.

[0047] S230: If yes, control all the switch valves 410 between the floor heating heat exchangers 400 and the four-way valves that are in a non-working state to be opened.

[0048] S230: If not, control the switch valves 410 between a portion of the floor heating heat exchangers 400 that are in a non-working state and the four-way valve to open.

[0049] That is, the refrigerant deficiency state of the air conditioner 10 of this embodiment is determined based on the difference between the exhaust temperature and the return water temperature. When the refrigerant deficiency state of the air conditioner 10 of this embodiment is serious, the switch valves 410 between all the non-operating floor heating heat exchangers 400 and the four-way valve are opened, thereby allowing the refrigerant accumulated in all the non-operating floor heating heat exchangers 400 to be replenished into the compressor. When the refrigerant deficiency state of the air conditioner 10 of this embodiment is relatively mild, the switch valves 410 between some of the non-operating floor heating heat exchangers 400 and the four-way valve are opened, thereby allowing the refrigerant accumulated in these some of the non-operating floor heating heat exchangers 400 to be replenished into the compressor. This not only replenishes the refrigerant into the compressor but also saves energy.

[0050] In some embodiments, as Figure 3 As shown, the determination of whether the air conditioner 10 is in a refrigerant shortage state in step 100 includes the following steps:

[0051] S110: Obtain operating parameters of the air conditioner 10. The operating parameters include the exhaust temperature of the compressor, the return water temperature of the floor heating heat exchanger 400, the opening of the electronic expansion valve of the outdoor unit, and the indoor temperature.

[0052] S120. Determine whether the operating parameters meet preset conditions. The preset conditions include the difference between the compressor's exhaust temperature and the return water temperature of the operating floor heating heat exchanger 400 being greater than a second preset temperature difference, for example, the second preset temperature difference may be 50 degrees Celsius. The opening of the outdoor unit's electronic expansion valve is greater than a first preset opening, for example, the first preset opening may be 250 pls. The difference between the return water temperature of the operating floor heating heat exchanger 400 and the indoor temperature is greater than a third preset temperature difference, for example, the third preset temperature difference may be 15 degrees Celsius.

[0053] S130: If yes, determine that the air conditioner 10 is in a refrigerant shortage state.

[0054] That is to say, by coupling and judging a plurality of operating parameters of the air conditioner 10 of this embodiment, it is possible to accurately detect whether the air conditioner 10 of this embodiment is lacking refrigerant.

[0055] In some embodiments, as Figure 4 As shown, after the switch valve 410 between the floor heating heat exchanger 400 and the four-way valve in the non-working state is opened in step 200, the following steps are also included:

[0056] S310: After a first preset time interval, the four-way valve is controlled to switch direction again. The first preset time interval may be 3 seconds to 10 seconds.

[0057] S320 , controlling the switch valve 410 between the floor heating heat exchanger 400 in a non-working state and the four-way valve to close.

[0058] After the non-operating floor heating heat exchanger 400 is connected to the compressor's intake port, the compressor extracts refrigerant from the non-operating floor heating heat exchanger 400 for a first preset time interval before controlling the four-way valve to reverse direction and closing the on-off valve 410 between the non-operating floor heating heat exchanger 400 and the four-way valve. This ensures that the refrigerant in the non-operating floor heating heat exchanger 400 is completely extracted and the compressor's exhaust port is reconnected to the operating floor heating heat exchanger 400, allowing high-temperature, high-pressure gaseous refrigerant to re-enter the operating floor heating heat exchanger 400, allowing the air conditioner 10 to function normally.

[0059] In some embodiments, as Figure 5 As shown, when it is determined that the air conditioner 10 is in a refrigerant-deficient state and before the four-way valve is controlled to switch, the following steps are also included:

[0060] S201, reducing the operating frequency of the compressor. That is, before controlling the switching of the four-way valve, reducing the operating frequency of the compressor, thereby protecting the compressor and extending the service life of the compressor.

[0061] Furthermore, if Figure 6 As shown, after the four-way valve is controlled again in step S310, the following steps are also included:

[0062] S311. Control the compressor's operating frequency to return to its state before the decrease. Specifically, before the four-way valve is switched in step S200, the compressor's operating frequency is recorded. After the four-way valve is switched again in step S310, the compressor's operating frequency is increased to the recorded compressor's operating frequency, thereby restoring normal floor heating function in the air conditioner 10 of this embodiment.

[0063] In some embodiments, when it is determined that the air conditioner 10 is in a refrigerant shortage state, the control method of the air conditioner 10 further includes the following steps:

[0064] The opening of the expansion valve 420 connected to the other end of the non-working floor heating heat exchanger 400 is controlled to be at the minimum opening, thereby preventing the refrigerant from entering the non-working floor heating heat exchanger 400 from the other end of the non-working floor heating heat exchanger 400, and ensuring that the refrigerant accumulated in the non-working floor heating heat exchanger 400 can be fully replenished to the compressor.

[0065] In some embodiments, as Figure 7 As shown, when it is determined that the air conditioner 10 is in a refrigerant shortage state, before the switch valve 410 between the floor heating heat exchanger 400 and the four-way valve in the non-operating state is opened, the following steps are also included:

[0066] S202 , control the switch valve 410 between the floor heating heat exchanger 400 in the non-working state and the four-way valve to open.

[0067] S203 , controlling the opening of the expansion valve 420 to increase to a second preset opening, so as to allow the refrigerant to enter the floor heating heat exchanger 400 in a non-working state.

[0068] S204 , after a second preset time interval, controlling the switch valve 410 between the floor heating heat exchanger 400 in a non-working state and the four-way valve to close.

[0069] That is to say, before recovering the refrigerant in the non-working floor heating heat exchanger 400, first open the switch valve 410 between the non-working floor heating heat exchanger 400 and the four-way valve, and control the opening of the expansion valve 420 at the other end thereof to increase to a second preset opening (for example, adjust the opening of the expansion valve 420 to the maximum opening) so that the refrigerant accumulated in the non-working floor heating heat exchanger 400 is replaced with a high-temperature and high-pressure refrigerant. After the subsequent suction port of the compressor is connected to one end of the non-working floor heating heat exchanger 400, the refrigerant reflux effect in the non-working floor heating heat exchanger 400 is better, thereby providing a prerequisite for shortening the refrigerant reflux time in the non-working floor heating heat exchanger 400.

[0070] The control method of the air conditioner 10 according to the embodiment of the present invention comprises the following steps:

[0071] The operating parameters of the air conditioner 10 are obtained.

[0072] Determine whether the operating parameters meet the preset conditions.

[0073] If so, it is determined that the air conditioner 10 is in the refrigerant shortage state.

[0074] When it is determined that the air conditioner 10 is in a refrigerant shortage state, the operating frequency of the compressor is reduced.

[0075] When it is determined that the air conditioner 10 is in a refrigerant shortage state, the four-way valve is controlled to be reversed, and the switch valve 410 between the floor heating heat exchanger 400 in a non-working state and the four-way valve is controlled to be opened.

[0076] After the four-way valve is switched and after a first preset time interval, the four-way valve is controlled to be switched again.

[0077] The switch valve 410 between the floor heating heat exchanger 400 in the non-working state and the four-way valve is controlled to be closed.

[0078] After the four-way valve is controlled to be reversed again, the operating frequency of the compressor is controlled to be restored to the state before the operating frequency was reduced.

[0079] An air conditioner 10 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0080] like Figure 9 As shown, the air conditioner 10 of the embodiment of the present invention includes a memory, a processor and a computer program stored in the memory. The processor executes the computer program to implement the steps of the control method of the air conditioner 10 in any of the above embodiments.

[0081] The processor 100 is adapted to execute stored instructions. The processor 100 may be a single-core processor 100, a multi-core processor 100, a computing cluster, or any number of other configurations. The memory 200 provides temporary storage space for the operation of the instructions during operation. The memory 200 may include a random access memory 200 (RAM), a read-only memory 200, a flash memory, or any other suitable storage system. When the computer program 210 is executed by the processor 100, the steps of the control method of the air conditioner 10 of any of the above embodiments are implemented.

[0082] The flowchart provided in this embodiment is not intended to indicate that the operations of the method will be performed in any particular order, or that all operations of the method are included in all every case. In addition, the method may include additional operations. Within the scope of the technical ideas provided by the method of this embodiment, additional changes can be made to the above method.

[0083] It should be understood that in some embodiments, each part can be implemented by hardware, software, firmware or a combination thereof. In the above embodiments, multiple steps or methods can be implemented by software or firmware stored in the memory 200 and executed by a suitable instruction execution system.

[0084] This embodiment also provides a computer program 210 product and a computer-readable storage medium. The computer program 210 product includes the computer program 210. When executed by the processor 100, the computer program 210 implements the steps of any of the aforementioned methods for controlling the air conditioner 10. The computer-readable storage medium stores the computer program 210. When executed by the processor 100, the computer program 210 implements the steps of any of the aforementioned methods for controlling the air conditioner 10.

[0085] The computer program 210 for performing the operations of the present invention can be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, state setting data, configuration data for an integrated circuit, or source code or object code written in any combination of one or more programming languages ​​and procedural programming languages. The computer program 210 can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the latter case, the remote computer can be connected to the user's computer via any type of network (including a local area network (LAN) or a wide area network (WAN)), or can be connected to an external computer. In some embodiments, to perform various aspects of the present invention, an electronic circuit including, for example, a programmable logic circuit, a field programmable gate array (FPGA), or a programmable logic array (PLA) can execute computer-readable program instructions by utilizing state information of the computer-readable program instructions to personalize the electronic circuit.

[0086] In the description of this embodiment, the computer program 210 product refers to a related product including the computer program 210 .

[0087] For the purposes of the description of this embodiment, a computer-readable storage medium is a tangible device capable of retaining and storing a computer program 210, and can be any device that can contain, store, communicate, propagate, or transmit a program for use with or in conjunction with an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable storage media include the following: a portable computer disk, a hard disk, a random access memory 200 (RAM), a read-only memory 200 (ROM), an erasable programmable read-only memory 200 (EPROM or flash memory), a static random access memory 200 (SRAM), a portable compact disc read-only memory 200 (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanical encoding device, and any suitable combination of the foregoing.

[0088] At this point, those skilled in the art will recognize that, although a number of exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications consistent with the principles of the present invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims

1. A method for controlling an air conditioner, characterized in that: The air conditioner includes a compressor, a four-way valve, an outdoor heat exchanger, an indoor heat exchanger and a plurality of floor heating heat exchangers arranged in parallel with the indoor heat exchanger, and a switch valve is provided between an opening at one end of each floor heating heat exchanger and the four-way valve; The control method of the air conditioner includes: When the air conditioner is in heating mode and at least one of the floor heating heat exchangers is in a non-operating state, determining whether the air conditioner is in a refrigerant shortage state; If so, the four-way valve is controlled to be reversed, and the switch valve between the non-working floor heating heat exchanger and the four-way valve is controlled to open, so that the non-working floor heating heat exchanger is connected to the suction port of the compressor.

2. The air conditioner control method according to claim 1, characterized in that: The controlling of opening the switch valve between the floor heating heat exchanger in a non-working state and the four-way valve comprises: Obtaining the exhaust temperature of the compressor and the return water temperature of the floor heating heat exchanger in a working state; Determining, based on the exhaust temperature and the return water temperature, whether a difference between the exhaust temperature and the return water temperature is greater than or equal to a first preset temperature difference; If so, all the switch valves between the floor heating heat exchangers and the four-way valve that are in a non-working state are controlled to be opened; If not, the switch valves between a portion of the floor heating heat exchangers in a non-working state and the four-way valve are controlled to open.

3. The air conditioner control method according to claim 1, wherein: The determining whether the air conditioner is in a refrigerant shortage state includes: Obtaining operating parameters of the air conditioner; Determining whether the operating parameters meet preset conditions; If so, it is determined that the air conditioner is in the refrigerant-deficient state.

4. The control method of the air conditioner according to claim 3, wherein the air conditioner further comprises an outdoor unit, wherein: The operating parameters include the exhaust temperature of the compressor, the return water temperature of the floor heating heat exchanger, the opening of the electronic expansion valve of the outdoor unit, and the indoor temperature; The preset conditions include: The difference between the exhaust temperature of the compressor and the return water temperature of the floor heating heat exchanger in the working state is greater than a second preset temperature difference; The opening degree of the electronic expansion valve of the outdoor unit is greater than a first preset opening degree; The difference between the return water temperature of the floor heating heat exchanger in a working state and the indoor temperature is greater than a third preset temperature difference.

5. The air conditioner control method according to claim 1, characterized in that: After the switch valve between the floor heating heat exchanger in the non-working state and the four-way valve is opened, the method further includes: After a first preset time interval, controlling the four-way valve to switch direction again; The switch valve between the floor heating heat exchanger in a non-working state and the four-way valve is controlled to be closed.

6. The air conditioner control method according to claim 1, characterized in that: When it is determined that the air conditioner is in a refrigerant shortage state, and before controlling the switching of the four-way valve, the method further includes reducing the operating frequency of the compressor.

7. The air conditioner control method according to claim 5, characterized in that: After controlling the reversal of the four-way valve again, the method further includes controlling the operating frequency of the compressor to return to the state before the operating frequency was reduced.

8. The air conditioner control method according to claim 1, wherein: The other end of the floor heating heat exchanger is connected to an expansion valve; When it is determined that the air conditioner is in a refrigerant shortage state, the air conditioner control method further includes: The opening of the expansion valve connected to the other end of the floor heating heat exchanger in a non-working state is controlled to be at a minimum opening.

9. The air conditioner control method according to claim 8, characterized in that: When it is determined that the air conditioner is in a refrigerant shortage state, before the switch valve between the floor heating heat exchanger in the non-operating state and the four-way valve is opened, the method further includes: Controlling the switch valve between the floor heating heat exchanger in a non-working state and the four-way valve to open; and Controlling the opening of the expansion valve to increase to a second preset opening, so as to allow the refrigerant to enter the floor heating heat exchanger in a non-working state; After a second preset time interval, the switch valve between the floor heating heat exchanger in a non-working state and the four-way valve is controlled to be closed.

10. An air conditioner, characterized in that: The invention comprises a memory, a processor and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the air conditioner control method according to any one of claims 1 to 9.

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