Air conditioner

Abstract

The air conditioner comprises a refrigerant circulation loop, an electronic expansion valve, an exhaust temperature sensor, a condenser temperature sensor, an evaporator temperature sensor and a controller, and the controller is configured to obtain operation parameters of the air conditioner and determine the opening degree adjusting range of the electronic expansion valve according to the change condition of the operation parameters; the opening degree of the electronic expansion valve is controlled according to the opening degree adjusting range, the operation parameters comprise the exhaust temperature of the compressor, the temperature of the condenser, the temperature of the evaporator and the opening degree of the electronic expansion valve, the purpose of restraining the exhaust temperature from fluctuating violently is achieved, and the operation performance and reliability of the air conditioner are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and particularly to an air conditioner. Background Art

[0002] In the prior art, the method of reducing the adjustment rate of the electronic expansion valve is usually adopted to reduce the change rate of the exhaust temperature, so that the change rate of the exhaust temperature matches the change rate of the opening of the electronic expansion valve, thereby avoiding the problem of periodic fluctuation of the exhaust temperature caused by too large or too small opening adjustment of the electronic expansion valve. However, many problems will occur in the actual operation of the air conditioner with this method. For example, when the adjustment rate of the electronic expansion valve is small, the opening adjustment of the electronic expansion valve is too slow, which is likely to cause the exhaust temperature to be too high, so that the exhaust temperature fluctuates violently, and even shutdown protection occurs; when the opening adjustment of the electronic expansion valve is too fast, it will lead to a large opening of the electronic expansion valve, so that the exhaust temperature is too low for a long time, resulting in low performance of the refrigeration system, and there may also be a phenomenon of liquid return in the refrigeration system, causing air conditioner failure. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. For this reason, the object of the present invention is to provide an air conditioner.

[0004] An air conditioner provided by the present invention includes: a refrigerant circulation circuit for enabling the refrigerant to perform a refrigeration cycle in a circuit composed of a compressor, a condenser, an electronic expansion valve, and an evaporator, wherein one of the condenser and the evaporator is an outdoor heat exchanger, and the other is an indoor heat exchanger; the electronic expansion valve is arranged between the condenser and the evaporator, and is configured to increase the flow resistance of the refrigerant passing through the electronic expansion valve when its opening is reduced, and decrease the flow resistance of the refrigerant passing through the electronic expansion valve when its opening is increased; an exhaust temperature sensor for detecting the exhaust temperature of the compressor; a condenser temperature sensor for detecting the temperature of the condenser; an evaporator temperature sensor for detecting the temperature of the evaporator; a controller configured to: obtain the operating parameters of the air conditioner, determine the opening adjustment range of the electronic expansion valve according to the change of the operating parameters, and control the opening of the electronic expansion valve according to the opening adjustment range, wherein the operating parameters include the exhaust temperature of the compressor, the temperature of the condenser, the temperature of the evaporator, and the opening of the electronic expansion valve.

[0005] In addition, the air conditioner according to the embodiment of the present invention may further have the following additional technical features:

[0006] Further, when determining the opening adjustment range of the electronic expansion valve according to the change of the operating parameters, the controller is specifically configured to: judge whether to limit the opening adjustment range of the electronic expansion valve according to the change of multiple groups of the operating parameters within a preset time, and determine the opening adjustment range of the electronic expansion valve according to the judgment result.

[0007] Further, when judging whether to limit the opening adjustment range of the electronic expansion valve according to the change of multiple groups of the operating parameters within a preset time, the controller is specifically configured to: determine the upper deviation threshold and the lower deviation threshold of the exhaust superheat degree according to multiple groups of the operating parameters; when the upper deviation threshold and the lower deviation threshold are greater than a preset deviation value, limit the opening adjustment range of the electronic expansion valve; when the upper deviation threshold and / or the lower deviation threshold are not greater than the preset deviation value, do not limit the opening adjustment range of the electronic expansion valve.

[0008] Further, when determining the opening adjustment range of the electronic expansion valve according to the judgment result, the controller is specifically configured to: when limiting the opening adjustment range of the electronic expansion valve, determine the target adjustment range of the opening of the electronic expansion valve after limitation according to multiple groups of the operating parameters, and use the target adjustment range as the opening adjustment range of the electronic expansion valve; when not limiting the opening adjustment range of the electronic expansion valve, keep the opening adjustment range of the electronic expansion valve unchanged.

[0009] Further, when determining the upper deviation threshold and the lower deviation threshold of the exhaust superheat degree according to multiple groups of the operating parameters, the controller is specifically configured to: determine the upper deviation value and the lower deviation value of the exhaust superheat degree corresponding to each group of the operating parameters; use the maximum value among multiple upper deviation values as the upper deviation threshold of the exhaust superheat degree, and use the maximum value among multiple lower deviation values as the lower deviation threshold of the exhaust superheat degree.

[0010] Further, when determining the upper deviation value and the lower deviation value of the exhaust superheat degree corresponding to each group of the operating parameters, the controller is specifically configured to: determine the exhaust superheat degree corresponding to each group of the operating parameters; use the difference between the exhaust superheat degree corresponding to each group of the operating parameters and the target exhaust superheat degree as the upper deviation value of the exhaust superheat degree; and use the difference between the target exhaust superheat degree and the exhaust superheat degree corresponding to each group of the operating parameters as the lower deviation value of the exhaust superheat degree.

[0011] Further, when determining the exhaust superheat degree corresponding to each set of the operating parameters, the controller is specifically configured as follows: when the air conditioner is in the heating mode, the exhaust superheat degree corresponding to each set of the operating parameters is the difference between the exhaust temperature and the temperature of the evaporator; when the air conditioner is in the cooling mode, the exhaust superheat degree corresponding to each set of the operating parameters is the difference between the exhaust temperature and the temperature of the condenser.

[0012] Further, when determining the target adjustment range of the opening degree of the throttling element after limitation according to multiple sets of the operating parameters, the controller is specifically configured as follows: determining the maximum opening degree and the minimum opening degree of the throttling element among multiple sets of the operating parameters; and determining the target adjustment range of the opening degree of the throttling element after limitation according to the maximum opening degree and the minimum opening degree of the throttling element.

[0013] Further, when determining the target adjustment range of the opening degree of the throttling element after limitation according to the maximum opening degree and the minimum opening degree of the throttling element, the controller is specifically configured as follows: calculating the difference between the maximum opening degree and the minimum opening degree; and determining the target adjustment range of the opening degree of the throttling element after limitation according to the difference between the maximum opening degree and the minimum opening degree.

[0014] Further, when determining the target adjustment range of the opening degree of the throttling element after limitation according to the difference between the maximum opening degree and the minimum opening degree, the controller is specifically configured as follows: when the difference between the maximum opening degree and the minimum opening degree is within a first preset difference range, using the difference between the maximum opening degree and a preset opening degree as the upper limit value of the target adjustment range, and using the sum of the minimum opening degree and the preset opening degree as the lower limit value of the target adjustment range; when the difference between the maximum opening degree and the minimum opening degree exceeds the upper limit value of the first preset difference range, calculating a first product of the difference between the maximum opening degree and the minimum opening degree and a first coefficient, and using the difference between the maximum opening degree and the first product as the upper limit value of the target adjustment range, and calculating a second product of the difference between the maximum opening degree and the minimum opening degree and a second coefficient, and using the sum of the minimum opening degree and the second product as the lower limit value of the target adjustment range; when the difference between the maximum opening degree and the minimum opening degree does not exceed the lower limit value of the first preset difference range, keeping the opening degree adjustment range of the throttling element unchanged.

[0015] An air conditioner according to an embodiment of the present invention includes a refrigerant circulation circuit, an electronic expansion valve, an exhaust temperature sensor, a condenser temperature sensor, an evaporator temperature sensor, and a controller. Among them, the refrigerant circulation circuit enables the refrigerant to perform a refrigeration cycle in a circuit composed of a compressor, a condenser, an electronic expansion valve, and an evaporator. One of the condenser and the evaporator is an outdoor heat exchanger, and the other is an indoor heat exchanger. The electronic expansion valve is provided between the condenser and the evaporator. When the opening degree of the electronic expansion valve decreases, the flow resistance of the refrigerant passing through the electronic expansion valve increases, and when the opening degree increases, the flow resistance of the refrigerant passing through the electronic expansion valve decreases. The exhaust temperature sensor is used to detect the exhaust temperature of the compressor. The condenser temperature sensor is used to detect the temperature of the condenser. The evaporator temperature sensor is used to detect the temperature of the evaporator. The controller is configured to: obtain the operating parameters of the air conditioner, determine the opening degree adjustment range of the electronic expansion valve according to the change of the operating parameters, and control the opening degree of the electronic expansion valve according to the opening degree adjustment range. Among them, the operating parameters include the exhaust temperature of the compressor, the temperature of the condenser, the temperature of the evaporator, and the opening degree of the electronic expansion valve, so as to achieve the purpose of suppressing the violent fluctuation of the exhaust temperature and improve the operating performance and reliability of the air conditioner.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of the embodiments in conjunction with the accompanying drawings, where:

[0018] Figure 1 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention;

[0019] Figure 2 is a schematic structural diagram of a controller according to an embodiment of the present invention;

[0020] Figure 3 is a schematic structural diagram of an air conditioner according to another embodiment of the present invention;

[0021] Figure 4 is a flowchart for determining whether to limit the opening degree adjustment range of the electronic expansion valve according to the change of multiple sets of operating parameters within a preset time according to an embodiment of the present invention;

[0022] Figure 5 is a flowchart for determining the opening degree adjustment range of the electronic expansion valve according to the judgment result according to an embodiment of the present invention;

[0023] Figure 6It is a flowchart for determining the upper deviation threshold and the lower deviation threshold of the exhaust superheat degree according to multiple sets of operating parameters according to an embodiment of the present invention;

[0024] Figure 7 It is a flowchart for determining the upper deviation value and the lower deviation value of the exhaust superheat degree corresponding to each set of operating parameters according to an embodiment of the present invention;

[0025] Figure 8 It is a flowchart for determining the exhaust superheat degree corresponding to each set of operating parameters according to an embodiment of the present invention;

[0026] Figure 9 It is a flowchart for determining the target adjustment range of the opening degree of the throttled electronic expansion valve according to multiple sets of operating parameters according to an embodiment of the present invention;

[0027] Figure 10 It is a flowchart for determining the target adjustment range of the opening degree of the throttled electronic expansion valve according to the maximum opening degree and the minimum opening degree of the electronic expansion valve according to an embodiment of the present invention;

[0028] Figure 11 It is a flowchart for determining the target adjustment range of the opening degree of the throttled electronic expansion valve according to the difference between the maximum opening degree and the minimum opening degree according to an embodiment of the present invention;

[0029] Figure 12 It is a flowchart for the control method of an air conditioner according to an embodiment of the present invention. Detailed implementation manners

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0032] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and defined, the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] An embodiment of the present application provides an air conditioner 10. Referring to Figure 1 and Figure 2 , the air conditioner 10 includes a refrigeration system for exchanging heat with indoor air to meet the cooling or heating requirements.

[0035] The refrigeration system includes a compressor, a condenser, an electronic expansion valve and an evaporator. In the present application, the air conditioner 10 performs a refrigeration cycle by using the compressor, the condenser, the electronic expansion valve and the evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion and evaporation, and supplies refrigerant to the conditioned and heat-exchanged air.

[0036] The compressor compresses the refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.

[0037] The electronic expansion valve expands the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the electronic expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor.

[0038] The evaporator can achieve a refrigeration effect by exchanging heat with the material to be cooled by using the latent heat of evaporation of the refrigerant. Throughout the cycle, the air conditioner 10 can adjust the temperature of the indoor space.

[0039] The outdoor unit 2 of the air conditioner 10 refers to the part of the refrigeration cycle including the compressor and the outdoor heat exchanger. The indoor unit 1 of the air conditioner 10 includes an indoor heat exchanger, and the electronic expansion valve can be provided in the indoor unit 1 or the outdoor unit 2.

[0040] The indoor heat exchanger and the outdoor heat exchanger are used as condensers or evaporators. When the indoor heat exchanger is used as a condenser, the air conditioner 10 serves as a heater in the heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner 10 serves as a cooler in the cooling mode.

[0041] The air conditioner 10 in this application includes an indoor unit 1 and an outdoor unit 2. The indoor unit 1 and the outdoor unit 2 can be set as an integrated unit or a split unit. The indoor unit 1 can be set as a wall-mounted unit, a ceiling unit, a duct unit, etc., and the indoor unit 1 is installed on the top or upper part of the indoor room.

[0042] Referring to Figure 1 , taking the indoor wall-mounted unit as an example, the indoor wall-mounted unit is usually installed at positions such as the indoor wall surface. Again, for example, the indoor cabinet unit (not shown in the figure) is also a form of the indoor unit 1.

[0043] Taking the split unit as an example, the air conditioner 10 includes an indoor unit 1 and an outdoor unit 2. Among them, the outdoor unit 2 is usually set outdoors and is used for heat exchange with the indoor environment.

[0044] In addition, as shown in the figure, the air conditioner 10 is equipped with a controller 71 to control the operation of each component in the internal air conditioner 10, so that each component of the air conditioner 10 operates to realize each predetermined function of the air conditioner 10. Among them, a control device 200 is also attached to the air conditioner 10. Exemplarily, the control device 200 is specifically set as a remote controller, and the remote controller has a function of communicating with the controller 71 using, for example, infrared rays or other communication methods. The remote controller is used for users to perform various controls on the air conditioner 10 to realize the interaction between the user and the air conditioner 10.

[0045] The indoor unit 1 of the air conditioner 10 in the embodiment of this application is set at the top or upper part of the indoor. Generally speaking, the installation height of the indoor unit 1 is higher than the user activity area. The indoor unit 1 includes an air return opening and an air outlet communicating with the indoor. The indoor air passes through the air return opening into the indoor unit 1 and then flows back into the indoor through the air outlet.

[0046] The refrigerant circulation circuit in this application circulates the refrigerant in a circuit composed of a compressor, a condenser, an electronic expansion valve, and an evaporator. One of the condenser and the evaporator is the outdoor heat exchanger, and the other is the indoor heat exchanger. The indoor heat exchanger is used for heat exchange with the air in the indoor unit 1, and the outdoor unit 2 heat exchanger is used for heat exchange with the air in the outdoor unit 2, so as to realize the cooling or heating requirements of the air conditioner 10.

[0047] An indoor fan is also included in the indoor unit 1. The indoor fan is arranged near the air return opening or the air outlet of the indoor heat exchanger and is used to send the heat-exchanged air to the indoor. The indoor fan includes multiple gears and is used to change the air outlet speed of the air flow at the air outlet.

[0048] A wind deflector is provided at the position of the air outlet. By changing the relative rotation angle between the wind deflector and the air outlet, the outflow direction of the air flowing through the air outlet is adjusted, thereby affecting the air temperature stratification in the room.

[0049] In the embodiment shown in the present application, the air conditioner 10 further includes a controller 71. The controller 71 refers to a device that can generate an operation control signal according to the instruction operation code and timing signal to instruct the air conditioner 10 to execute a control instruction. For example, in response to the power-on or power-off instruction issued by the user received, the controller 71 can perform operations related to the object selected by the power-on or power-off instruction.

[0050] The embodiment of the present application also provides a schematic diagram of the hardware structure of the controller 71, as Figure 2 shown. The controller 71 includes a processor 83. Optionally, it further includes a memory 82 and a communication interface 84 connected to the processor 83. The processor 83, the memory 82, and the communication interface 84 are connected through a bus 81.

[0051] The processor 83 can be a central processing unit 83 (CPU), a general-purpose processor 83, a network processor 83 (NP), a digital signal processor 83 (DSP), a microprocessor 83, a microcontroller 718, a programmable logic device (PLD), or any combination thereof. The processor 83 can also be any other device with processing functions, such as a circuit, a device, or a software module. The processor 83 can also include multiple CPUs, and the processor 83 can be a single-core (single-CPU) processor 83 or a multi-core (multi-CPU) processor 83. Here, the processor 83 can refer to one or more devices, circuits, or processing cores for processing data (such as computer program instructions).

[0052] The memory 82 can be a read-only memory (ROM), or other types of static storage devices that can store static information and instructions, a random access memory (RAM), or other types of dynamic storage devices that can store information and instructions. It can also be an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM), or other optical disc storage, optical disc storage (including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media, or other magnetic storage devices, or any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer. The embodiments of the present application do not impose any restrictions on this. The memory 82 can exist independently or be integrated with the processor 83. Among them, the memory 82 can contain computer program code. The processor 83 is used to execute the computer program code stored in the memory 82, thereby implementing the control method of the air conditioner provided by the embodiments of the present application.

[0053] The communication interface 84 can be used to communicate with other devices or communication networks (such as Ethernet, radio access network (RAN), wireless local area networks (WLAN), etc.). The communication interface 84 can be a module, a circuit, a transceiver, or any device capable of implementing communication.

[0054] The bus 81 can be a peripheral component interconnect (PCI) bus 81 or an extended industry standard architecture (EISA) bus 81, etc. The bus 81 can be divided into an address bus 81, a data bus 81, a control bus 81, etc. For the sake of representation, Figure 2 only a thick line is used to represent it in the figure, but it does not mean that there is only one bus 81 or one type of bus 81.

[0055] The following refers to Figures 3 - 12 describe the air conditioner according to the embodiments of the present invention.

[0056] Figure 3 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention. As Figure 3As shown in the figure, an air conditioner 10 includes: a refrigerant circulation circuit 11, an electronic expansion valve 12, an exhaust temperature sensor 13, a condenser temperature sensor 14, an evaporator temperature sensor 15, and a controller 71. Among them, the refrigerant circulation circuit 11 enables the refrigerant to perform a refrigeration cycle in a circuit composed of a compressor, a condenser, the electronic expansion valve 12, and an evaporator. One of the condenser and the evaporator is an outdoor heat exchanger, and the other is an indoor heat exchanger; the electronic expansion valve 12 is provided between the condenser and the evaporator. When the opening degree of the electronic expansion valve 12 decreases, the flow resistance of the refrigerant passing through the electronic expansion valve 12 increases, and when the opening degree increases, the flow resistance of the refrigerant passing through the electronic expansion valve 12 decreases; the exhaust temperature sensor 13 is used to detect the exhaust temperature of the compressor; the condenser temperature sensor 14 is used to detect the temperature of the condenser; the evaporator temperature sensor 15 is used to detect the temperature of the evaporator; the controller 71 is configured to: obtain the operating parameters of the air conditioner 10, determine the opening degree adjustment range of the electronic expansion valve 12 according to the change of the operating parameters, and control the opening degree of the electronic expansion valve 12 according to the opening degree adjustment range. Among them, the operating parameters include the exhaust temperature of the compressor, the temperature of the condenser, the temperature of the evaporator, and the opening degree of the electronic expansion valve 12.

[0057] Specifically, after the air conditioner 10 is turned on and running, the air conditioner 10 controls the opening degree of the electronic expansion valve 12 according to the target exhaust superheat. The target exhaust superheat of the air conditioner 10 can be calculated through a preset algorithm based on the current indoor and outdoor environmental temperatures, the compressor operating frequency, and the operating gears of the indoor and outdoor fans, etc., so as to control the opening degree of the electronic expansion valve 12 according to the target exhaust superheat of the air conditioner 10. During the process of controlling the opening degree of the electronic expansion valve 12 according to the target exhaust superheat, the embodiment of the present invention sets a control time period, for example, denoted as the first preset time, to provide a buffer time for the adjustment of the operating parameters of the air conditioner 10, such as the exhaust temperature, and wait for the operating parameters of the air conditioner 10 to tend to be stable. Specifically, when the time for the air conditioner 10 to control the opening degree of the electronic expansion valve 12 according to the target exhaust superheat reaches the first preset time, it is considered that the operating parameters of the air conditioner 10, such as the exhaust temperature, can complete the conversion from an unstable operating state to a stable operating state. At this time, the operating parameters of the air conditioner 10 are started to be acquired. Among them, the operating parameters include the exhaust temperature of the compressor, the temperature of the condenser, the temperature of the evaporator, and the opening degree of the electronic expansion valve 12, and the opening degree adjustment range of the electronic expansion valve 12 is determined according to the change of the operating parameters, so as to control the opening degree of the electronic expansion valve 12, thereby suppressing the severe periodic fluctuation of the exhaust temperature by limiting the opening degree adjustment range of the electronic expansion valve 12. After determining the opening degree adjustment range of the electronic expansion valve 12 through the operating parameters, the next control time period is entered to control the opening degree of the electronic expansion valve 12 according to the determined opening degree adjustment range of the electronic expansion valve 12. After the control time period ends, the operation of acquiring the operating parameters is performed again to check whether the exhaust temperature of the air conditioner 10 is suppressed from severe periodic fluctuations this time, that is, when the time for controlling the opening degree of the electronic expansion valve 12 according to the opening degree adjustment range of the electronic expansion valve 12 reaches the first preset time, the step of acquiring the operating parameters of the air conditioner 10 is returned to execute, and so on in a cycle to control the opening degree of the electronic expansion valve 12. Thus, when the exhaust temperature shows severe periodic fluctuations, by limiting the opening degree adjustment range of the electronic expansion valve 12 multiple times in a cycle, the purpose of suppressing the severe fluctuation of the exhaust temperature is achieved, and the operating performance and reliability of the air conditioner 10 are improved.

[0058] It can be understood that when the embodiment of the present invention limits the opening degree adjustment range of the electronic expansion valve 12, the opening degree adjustment range of the electronic expansion valve 12 can be gradually reduced, so as to avoid the opening degree of the electronic expansion valve 12 being adjusted too large or too small, resulting in severe periodic fluctuations of the exhaust temperature.

[0059] In a specific embodiment, after the air conditioner 10 is turned on and running, the opening degree of the electronic expansion valve 12 is controlled according to the current target discharge superheat degree of the air conditioner 10. When the first preset time, for example, 5 minutes, elapses continuously, the operating parameters of the air conditioner 10 are acquired to limit the opening degree adjustment range of the electronic expansion valve 12 through the operating parameters. The opening degree adjustment range of the electronic expansion valve 12 is re-controlled according to the limited opening degree adjustment range, and the step of acquiring the operating parameters of the air conditioner 10 is executed again after the first preset time of 5 minutes. This cycle repeats to control the opening degree adjustment of the electronic expansion valve 12, so as to achieve the purpose of suppressing the drastic fluctuation of the discharge temperature and improve the operating performance and reliability of the air conditioner 10.

[0060] In an embodiment of the present invention, when determining the opening degree adjustment range of the electronic expansion valve according to the change of the operating parameters, the controller is specifically configured to: judge whether to limit the opening degree adjustment range of the electronic expansion valve according to the change of multiple groups of operating parameters within a preset time, and determine the opening degree adjustment range of the electronic expansion valve according to the judgment result.

[0061] Specifically, after the air conditioner 10 operates for the first preset time according to the target discharge superheat degree, when the operating parameters change from an unstable operating state to a stable operating state, the operating parameters of the air conditioner 10 acquired at this time can be used to judge whether there is a drastic periodic fluctuation in the discharge temperature of the air conditioner 10. When there is a drastic periodic fluctuation in the discharge temperature of the air conditioner 10, the opening degree adjustment range of the electronic expansion valve is determined according to the change of the operating parameters to suppress the drastic fluctuation of the discharge temperature. Specifically, a preset time, for example, denoted as the second preset time, is set after the first preset time. According to the change of multiple groups of operating parameters of the air conditioner 10 within the second preset time, it is judged whether the discharge temperature will have a drastic periodic fluctuation. If it is judged from multiple groups of operating parameters that the discharge temperature has a periodic fluctuation, the opening degree adjustment range of the electronic expansion valve 12 needs to be limited to suppress the drastic fluctuation of the discharge temperature, otherwise it is considered that there is no need to limit the opening degree adjustment range of the electronic expansion valve 12.

[0062] In a specific embodiment, multiple groups of operating parameters of the air conditioner 10 within the second preset time, for example, 6 minutes, are acquired to judge whether to limit the opening degree adjustment range of the electronic expansion valve 12 through the multiple groups of operating parameters, that is, to judge whether there is a periodic fluctuation in the discharge temperature through the discharge temperature of the compressor, the temperature of the condenser, the temperature of the evaporator and the opening degree of the electronic expansion valve 12. If it is judged from multiple groups of operating parameters that the discharge temperature of the air conditioner 10 has a periodic fluctuation, the opening degree adjustment range of the electronic expansion valve 12 is limited, and the opening degree adjustment range of the electronic expansion valve 12 is re-controlled according to the limited opening degree adjustment range.

[0063] In an embodiment of the present invention, as Figure 4As shown in the figure, when determining whether to limit the opening adjustment range of the electronic expansion valve 12 according to the change of multiple sets of operating parameters within a preset time, the controller 71 is specifically configured to: determine the upper deviation threshold and the lower deviation threshold of the exhaust superheat degree according to the multiple sets of operating parameters; when the upper deviation threshold and the lower deviation threshold are greater than the preset deviation value, limit the opening adjustment range of the electronic expansion valve 12; when the upper deviation threshold and / or the lower deviation threshold are not greater than the preset deviation value, do not limit the opening adjustment range of the electronic expansion valve 12.

[0064] Specifically, the upper deviation threshold and the lower deviation threshold of the exhaust superheat degree characterize the fluctuation degree of the exhaust temperature. When the upper deviation threshold and the lower deviation threshold are larger, the fluctuation degree of the exhaust temperature is larger, and vice versa. Determine the upper deviation threshold and the lower deviation threshold of the exhaust superheat degree according to the multiple sets of operating parameters within a preset time. When the upper deviation threshold and the lower deviation threshold are greater than the preset deviation value, it is considered that the fluctuation degree of the exhaust temperature is larger at this time, and it is necessary to limit the opening adjustment range of the electronic expansion valve 12 to prevent the opening of the electronic expansion valve 12 from being adjusted too large, resulting in a sharp fluctuation of the exhaust temperature; when the upper deviation threshold and / or the lower deviation threshold are not greater than the preset deviation value, it is considered that the fluctuation degree of the exhaust temperature is smaller at this time, and it is not necessary to limit the opening adjustment range of the electronic expansion valve 12.

[0065] In an embodiment of the present invention, as Figure 5 shown in the figure, when determining the opening adjustment range of the electronic expansion valve 12 according to the judgment result, the controller 71 is specifically configured to: when limiting the opening adjustment range of the electronic expansion valve 12, determine the target adjustment range of the opening of the electronic expansion valve 12 after limitation according to the multiple sets of operating parameters, and use the target adjustment range as the opening adjustment range of the electronic expansion valve 12; when not limiting the opening adjustment range of the electronic expansion valve 12, keep the opening adjustment range of the electronic expansion valve 12 unchanged.

[0066] Specifically, the exhaust temperature of the compressor, the temperature of the condenser, the temperature of the evaporator and the opening of the electronic expansion valve 12 in the multiple sets of operating parameters reflect the current exhaust superheat degree of the air conditioner 10 and the current opening adjustment range of the electronic expansion valve 12. When limiting the opening adjustment range of the electronic expansion valve 12, determine the target adjustment range of the opening of the electronic expansion valve 12 after limitation according to the multiple sets of operating parameters, so as to control the opening of the electronic expansion valve 12 according to the target adjustment range, thereby gradually narrowing the opening adjustment range of the electronic expansion valve 12, and avoiding the opening of the electronic expansion valve 12 from being adjusted too large or too small, resulting in sharp periodic fluctuations of the exhaust temperature. When not limiting the opening adjustment range of the electronic expansion valve 12, the opening adjustment range of the electronic expansion valve 12 remains unchanged, that is, there is no need to narrow the opening adjustment range of the electronic expansion valve 12, and the opening of the electronic expansion valve 12 can be controlled to be adjusted according to the original opening adjustment range.

[0067] In one embodiment of the present invention, as Figure 6 shown, when determining the upper deviation threshold and the lower deviation threshold of the superheat degree of the exhaust gas according to multiple sets of operating parameters, the controller 71 is specifically configured to: determine the upper deviation value and the lower deviation value of the superheat degree of the exhaust gas corresponding to each set of operating parameters; use the maximum value among the multiple upper deviation values as the upper deviation threshold of the superheat degree of the exhaust gas, and use the maximum value among the multiple lower deviation values as the lower deviation threshold of the superheat degree of the exhaust gas.

[0068] Specifically, within the detection time period, the operating parameters of the air conditioner 10 can be collected multiple times, and each set of operating parameters collected each time is used as a set of operating parameters, so as to obtain multiple sets of operating parameters. Each set of operating parameters includes, but is not limited to, the exhaust temperature of the compressor, the temperature of the condenser, the temperature of the evaporator, and the opening degree of the electronic expansion valve 12. It can be understood that the operating parameters of the air conditioner 10 can be collected periodically at regular intervals or non-periodically, and there is no limitation here. In this way, after obtaining multiple sets of operating parameters, determine the upper deviation value and the lower deviation value of the superheat degree of the exhaust gas corresponding to each set of operating parameters; use the maximum value among the multiple upper deviation values corresponding to the multiple sets of operating parameters as the upper deviation threshold of the superheat degree of the exhaust gas within the detection time period, and use the maximum value among the multiple lower deviation values corresponding to the multiple sets of operating parameters as the lower deviation threshold of the superheat degree of the exhaust gas within the detection time period.

[0069] In one embodiment of the present invention, as Figure 7 shown, when determining the upper deviation value and the lower deviation value of the superheat degree of the exhaust gas corresponding to each set of operating parameters, the controller 71 is specifically configured to: determine the superheat degree of the exhaust gas corresponding to each set of operating parameters; use the difference between the superheat degree of the exhaust gas corresponding to each set of operating parameters and the target superheat degree of the exhaust gas as the upper deviation value of the superheat degree of the exhaust gas; and use the difference between the target superheat degree of the exhaust gas and the superheat degree of the exhaust gas corresponding to each set of operating parameters as the lower deviation value of the superheat degree of the exhaust gas.

[0070] Specifically, the target superheat degree of the exhaust gas is the desired superheat degree value when the air conditioner 10 operates under the set working conditions. Use the difference between the superheat degree of the exhaust gas corresponding to each set of operating parameters and the target superheat degree of the exhaust gas as the upper deviation value of the superheat degree of the exhaust gas, and use the difference between the target superheat degree of the exhaust gas and the superheat degree of the exhaust gas corresponding to each set of operating parameters as the lower deviation value of the superheat degree of the exhaust gas. Thus, the upper deviation value and the lower deviation value corresponding to each set of operating parameters characterize the fluctuation degree of the exhaust temperature. By comparison, the maximum upper deviation value and the maximum lower deviation value corresponding to multiple sets of operating parameters can be obtained, that is, they correspond to the maximum fluctuation degree of the exhaust temperature. Use the maximum upper deviation value and the maximum lower deviation value as the upper deviation threshold and the lower deviation threshold of the superheat degree of the exhaust gas, so as to be used as the conditions for limiting the opening adjustment range of the electronic expansion valve 12.

[0071] In an embodiment of the present invention, as Figure 8 shown, when determining the exhaust superheat degree corresponding to each set of operating parameters, the controller 71 is specifically configured as follows: when the air conditioner 10 is in the heating mode, the exhaust superheat degree corresponding to each set of operating parameters is the difference between the exhaust temperature and the temperature of the evaporator; when the air conditioner 10 is in the cooling mode, the exhaust superheat degree corresponding to each set of operating parameters is the difference between the exhaust temperature and the temperature of the condenser.

[0072] Specifically, the exhaust superheat degree is the difference between the temperature of the exhaust gas and its saturation temperature. In the heating mode, the air conditioner 10 absorbs external heat through the evaporator and releases it into the indoor air. Therefore, the exhaust superheat degree corresponding to each set of operating parameters in the heating mode is the difference between the exhaust temperature and the evaporator temperature; in the cooling mode, the air conditioner 10 discharges heat from the indoor air through the condenser. Therefore, the exhaust superheat degree corresponding to each set of operating parameters in the cooling mode is the difference between the exhaust temperature and the temperature of the evaporator.

[0073] In an embodiment of the present invention, as Figure 9 shown, when determining the target adjustment range of the opening degree of the throttling electronic expansion valve 12 according to multiple sets of operating parameters, the controller 71 is specifically configured as follows: determine the maximum opening degree and the minimum opening degree of the electronic expansion valve 12 in the multiple sets of operating parameters; determine the target adjustment range of the opening degree of the throttling electronic expansion valve 12 according to the maximum opening degree and the minimum opening degree of the electronic expansion valve 12.

[0074] Specifically, when limiting the adjustment range of the opening degree of the electronic expansion valve 12, determine the target adjustment range of the opening degree of the throttling electronic expansion valve 12 according to multiple sets of operating parameters, that is, use the maximum opening degree and the minimum opening degree of the electronic expansion valve 12 in the multiple sets of operating parameters within the current detection time period to determine the target adjustment range of the opening degree of the throttling electronic expansion valve 12. Specifically, when the electronic expansion valve 12 is adjusted to the maximum opening degree and the minimum opening degree, due to the large adjustment amplitude, it is easy to cause severe periodic fluctuations in the exhaust temperature. Therefore, in the embodiment of the present invention, by limiting based on the maximum opening degree and the minimum opening degree of the electronic expansion valve 12 within the current detection time period to determine the target adjustment range of the opening degree of the electronic expansion valve 12, the adjustment range of the opening degree of the electronic expansion valve 12 can be further reduced, thereby effectively reducing the adjustment amplitude of the electronic expansion valve 12, so as to achieve the purpose of suppressing severe fluctuations in the exhaust temperature and improving the operating performance and reliability of the air conditioner 10.

[0075] In an embodiment of the present invention, as Figure 10As shown, when determining the target adjustment range of the opening degree of the electronically controlled expansion valve 12 after limitation based on the maximum opening degree and the minimum opening degree of the electronically controlled expansion valve 12, the controller 71 is specifically configured to: calculate the difference between the maximum opening degree and the minimum opening degree; determine the target adjustment range of the opening degree of the electronically controlled expansion valve 12 after limitation according to the difference between the maximum opening degree and the minimum opening degree.

[0076] Specifically, within the currently detected time period, the magnitude of the difference between the maximum opening degree and the minimum opening degree characterizes the adjustment range of the electronically controlled expansion valve 12. When determining the target adjustment range of the opening degree of the electronically controlled expansion valve 12 after limitation based on the maximum opening degree and the minimum opening degree of the electronically controlled expansion valve 12, the difference between the maximum opening degree and the minimum opening degree can be calculated first, so as to determine the target adjustment range of the opening degree of the electronically controlled expansion valve 12 after limitation on the basis of the current adjustment range of the electronically controlled expansion valve 12, such that the adjustment range corresponding to the target adjustment range becomes smaller relative to the current adjustment range of the electronically controlled expansion valve 12, thereby gradually reducing the opening degree adjustment range of the electronically controlled expansion valve 12 and avoiding drastic periodic fluctuations in the exhaust temperature.

[0077] In an embodiment of the present invention, as Figure 11 shown, when determining the target adjustment range of the opening degree of the electronically controlled expansion valve 12 after limitation according to the difference between the maximum opening degree and the minimum opening degree, the controller 71 is specifically configured to: when the difference between the maximum opening degree and the minimum opening degree is within the first preset difference range, use the difference between the maximum opening degree and the preset opening degree as the upper limit value of the target adjustment range, and use the sum of the minimum opening degree and the preset opening degree as the lower limit value of the target adjustment range; when the difference between the maximum opening degree and the minimum opening degree exceeds the upper limit value of the first preset difference range, calculate the first product of the difference between the maximum opening degree and the minimum opening degree and the first coefficient, and use the difference between the maximum opening degree and the first product as the upper limit value of the target adjustment range, and calculate the second product of the difference between the maximum opening degree and the minimum opening degree and the second coefficient, and use the sum of the minimum opening degree and the second product as the lower limit value of the target adjustment range; when the difference between the maximum opening degree and the minimum opening degree does not exceed the lower limit value of the first preset difference range, the opening degree adjustment range of the electronically controlled expansion valve 12 remains unchanged.

[0078] Specifically, when the difference between the maximum opening and the minimum opening is within the first preset difference range, it is considered that the exhaust gas temperature fluctuates greatly. The difference between the maximum opening and the preset opening is used as the upper limit value of the target adjustment range, and the sum of the minimum opening and the preset opening is used as the lower limit value of the target adjustment range. By reducing the preset opening on the basis of the maximum opening and increasing the preset opening on the basis of the minimum opening, the opening adjustment range of the electronic expansion valve 12 is narrowed, so as to suppress the severe periodic fluctuation of the exhaust gas temperature without affecting the working efficiency of the air conditioner 10; when the difference between the maximum opening and the minimum opening exceeds the upper limit value of the first preset difference range, it is considered that the exhaust gas temperature fluctuates very greatly and is in a relatively unstable state. By calculating the first product of the difference between the maximum opening and the minimum opening and the first coefficient, and using the difference between the maximum opening and the first product as the upper limit value of the target adjustment range, and calculating the second product of the difference between the maximum opening and the minimum opening and the second coefficient, and using the sum of the minimum opening and the second product as the lower limit value of the target adjustment range, the difference between the maximum opening and the minimum opening is regulated by the preset first coefficient and second coefficient, so as to limit the opening adjustment range of the electronic expansion valve 12 according to the regulated first product and second product and the maximum opening and the minimum opening. A larger adjustment range is used to more flexibly narrow the opening adjustment range of the electronic expansion valve 12 to suppress the severe periodic fluctuation of the exhaust gas temperature; when the difference between the maximum opening and the minimum opening does not exceed the lower limit value of the first preset difference range, it is considered that the periodic fluctuation of the exhaust gas temperature is within the acceptable range, and the opening adjustment range of the electronic expansion valve 12 is controlled to remain unchanged.

[0079] In a specific embodiment, the maximum opening degree is, for example, P_max, the minimum opening degree is, for example, P_min, the preset opening degree is, for example, 1, the first coefficient is, for example, 0.25, and the second coefficient is, for example, 0.35. When the difference between the maximum opening degree P_max and the minimum opening degree P_min is, for example, within 2 ≤ P_max - P_min < 4, that is, within the first preset difference range, at this time, the upper limit value of the target adjustment range is P_max - 1, the lower limit value of the target adjustment range is P_min + 1, and the target adjustment range is from P_min + 1 to P_max - 1; when the difference between the maximum opening degree P_max and the minimum opening degree P_min is, for example, P_max - P_min >= 4, that is, the difference between the maximum opening degree and the minimum opening degree exceeds the upper limit value of the first preset difference range, at this time, the upper limit value of the target adjustment range is P_max - 0.25×(P_max - P_min), the lower limit value of the target adjustment range is P_min + 0.35×(P_max - P_min), and the target adjustment range is from P_min + 0.35×(P_max - P_min) to P_max - 0.25×(P_max - P_min); when the difference between the maximum opening degree and the minimum opening degree does not exceed the lower limit value of the first preset difference range, the opening degree adjustment range of the electronic expansion valve 12 remains unchanged. In this way, by limiting the opening degree adjustment range of the electronic expansion valve 12, the opening degree adjustment range of the electronic expansion valve 12 can be gradually reduced, the severe periodic fluctuation of the exhaust temperature can be suppressed, and the operating performance and reliability of the air conditioner 10 can be improved.

[0080] According to an embodiment of the present invention, an air conditioner 10 includes a refrigerant circulation circuit 11, an electronic expansion valve 12, an exhaust temperature sensor 13, a condenser temperature sensor 14, an evaporator temperature sensor 15, and a controller 71. Among them, the refrigerant circulation circuit 11 enables the refrigerant to perform a refrigeration cycle in a circuit composed of a compressor, a condenser, the electronic expansion valve 12, and an evaporator. One of the condenser and the evaporator is an outdoor heat exchanger, and the other is an indoor heat exchanger; the electronic expansion valve 12 is provided between the condenser and the evaporator. When the opening degree of the electronic expansion valve 12 decreases, the flow resistance of the refrigerant passing through the electronic expansion valve 12 increases, and when the opening degree increases, the flow resistance of the refrigerant passing through the electronic expansion valve 12 decreases; the exhaust temperature sensor 13 is used to detect the exhaust temperature of the compressor; the condenser temperature sensor 14 is used to detect the temperature of the condenser; the evaporator temperature sensor 15 is used to detect the temperature of the evaporator; the controller 71 is configured to: obtain the operating parameters of the air conditioner 10, determine the opening degree adjustment range of the electronic expansion valve 12 according to the change of the operating parameters, and control the opening degree of the electronic expansion valve 12 according to the opening degree adjustment range. Among them, the operating parameters include the exhaust temperature of the compressor, the temperature of the condenser, the temperature of the evaporator, and the opening degree of the electronic expansion valve 12, so as to achieve the purpose of suppressing the violent fluctuation of the exhaust temperature and improve the operating performance and reliability of the air conditioner 10. A further embodiment of the present invention also discloses a control method for an air conditioner, which is used for the air conditioner described in any of the above embodiments, as Figure 12 shown, the method includes the following steps:

[0081] Step S1: Obtain the operating parameters of the air conditioner;

[0082] Step S2: Determine the opening degree adjustment range of the electronic expansion valve according to the change of the operating parameters;

[0083] Step S3: Control the opening degree of the electronic expansion valve according to the opening degree adjustment range, where the operating parameters include the exhaust temperature of the compressor, the temperature of the condenser, the temperature of the evaporator, and the opening degree of the electronic expansion valve.

[0084] In an embodiment of the present invention, when determining the opening degree adjustment range of the electronic expansion valve according to the change of the operating parameters, it includes: judging whether to limit the opening degree adjustment range of the electronic expansion valve according to the change of multiple groups of operating parameters within a preset time, and determining the opening degree adjustment range of the electronic expansion valve according to the judgment result.

[0085] In an embodiment of the present invention, when determining whether to limit the opening adjustment range of the electronic expansion valve according to the change of multiple groups of operating parameters within a preset time, it includes: determining the upper deviation threshold and the lower deviation threshold of the exhaust superheat degree according to the multiple groups of operating parameters; when the upper deviation threshold and the lower deviation threshold are greater than the preset deviation value, limiting the opening adjustment range of the electronic expansion valve; when the upper deviation threshold and / or the lower deviation threshold are not greater than the preset deviation value, not limiting the opening adjustment range of the electronic expansion valve.

[0086] In an embodiment of the present invention, when determining the opening adjustment range of the electronic expansion valve according to the judgment result, it includes: when limiting the opening adjustment range of the electronic expansion valve, determining the target adjustment range of the opening of the electronic expansion valve after limitation according to the multiple groups of operating parameters, and using the target adjustment range as the opening adjustment range of the electronic expansion valve; when not limiting the opening adjustment range of the electronic expansion valve, keeping the opening adjustment range of the electronic expansion valve unchanged.

[0087] In an embodiment of the present invention, when determining the upper deviation threshold and the lower deviation threshold of the exhaust superheat degree according to the multiple groups of operating parameters, it includes: determining the upper deviation value and the lower deviation value of the exhaust superheat degree corresponding to each group of operating parameters; taking the maximum value among the multiple upper deviation values as the upper deviation threshold of the exhaust superheat degree, and taking the maximum value among the multiple lower deviation values as the lower deviation threshold of the exhaust superheat degree.

[0088] In an embodiment of the present invention, when determining the upper deviation value and the lower deviation value of the exhaust superheat degree corresponding to each group of operating parameters, it includes: determining the exhaust superheat degree corresponding to each group of operating parameters; taking the difference between the exhaust superheat degree corresponding to each group of operating parameters and the target exhaust superheat degree as the upper deviation value of the exhaust superheat degree; and taking the difference between the target exhaust superheat degree and the exhaust superheat degree corresponding to each group of operating parameters as the lower deviation value of the exhaust superheat degree.

[0089] In an embodiment of the present invention, when determining the exhaust superheat degree corresponding to each group of operating parameters, it includes: when the air conditioner is in the heating mode, the exhaust superheat degree corresponding to each group of operating parameters is the difference between the exhaust temperature and the temperature of the evaporator; when the air conditioner is in the cooling mode, the exhaust superheat degree corresponding to each group of operating parameters is the difference between the exhaust temperature and the temperature of the condenser.

[0090] In an embodiment of the present invention, when determining the target adjustment range of the opening of the electronic expansion valve after limitation according to the multiple groups of operating parameters, it includes: determining the maximum opening and the minimum opening of the electronic expansion valve among the multiple groups of operating parameters; determining the target adjustment range of the opening of the electronic expansion valve after limitation according to the maximum opening and the minimum opening of the electronic expansion valve.

[0091] In one embodiment of the present invention, when determining the target adjustment range of the opening degree of the throttling electronic expansion valve according to the maximum opening degree and the minimum opening degree of the electronic expansion valve, it includes: calculating the difference between the maximum opening degree and the minimum opening degree; determining the target adjustment range of the opening degree of the throttling electronic expansion valve according to the difference between the maximum opening degree and the minimum opening degree.

[0092] In one embodiment of the present invention, when determining the target adjustment range of the opening degree of the throttling electronic expansion valve according to the difference between the maximum opening degree and the minimum opening degree, it includes: when the difference between the maximum opening degree and the minimum opening degree is within the first preset difference range, taking the difference between the maximum opening degree and the preset opening degree as the upper limit value of the target adjustment range, and taking the sum of the minimum opening degree and the preset opening degree as the lower limit value of the target adjustment range; when the difference between the maximum opening degree and the minimum opening degree exceeds the upper limit value of the first preset difference range, calculating the first product of the difference between the maximum opening degree and the minimum opening degree and the first coefficient, and taking the difference between the maximum opening degree and the first product as the upper limit value of the target adjustment range, and calculating the second product of the difference between the maximum opening degree and the minimum opening degree and the second coefficient, and taking the sum of the minimum opening degree and the second product as the lower limit value of the target adjustment range; when the difference between the maximum opening degree and the minimum opening degree does not exceed the lower limit value of the first preset difference range, the opening degree adjustment range of the electronic expansion valve remains unchanged.

[0093] According to the control method of the air conditioner in the embodiment of the present invention, by obtaining the operating parameters of the air conditioner, determining the opening degree adjustment range of the electronic expansion valve according to the change of the operating parameters, and controlling the opening degree of the electronic expansion valve according to the opening degree adjustment range, wherein the operating parameters include the exhaust temperature of the compressor, the temperature of the condenser, the temperature of the evaporator and the opening degree of the electronic expansion valve, so as to achieve the purpose of suppressing the drastic fluctuation of the exhaust temperature and improve the operating performance and reliability of the air conditioner.

[0094] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example.

[0095] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An air conditioner, characterized in that: include: A refrigerant circulation loop, wherein the refrigerant performs a refrigeration cycle in a loop consisting of a compressor, a condenser, an electronic expansion valve, and an evaporator, wherein one of the condenser and the evaporator is an outdoor heat exchanger and the other is an indoor heat exchanger; The electronic expansion valve is arranged between the condenser and the evaporator, and is used to increase the flow resistance of the refrigerant passing through the electronic expansion valve when the opening degree of the electronic expansion valve is reduced, and to reduce the flow resistance of the refrigerant passing through the electronic expansion valve when the opening degree of the electronic expansion valve is increased; An exhaust temperature sensor, used to detect the exhaust temperature of the compressor; A condenser temperature sensor, used to detect the temperature of the condenser; An evaporator temperature sensor, used to detect the temperature of the evaporator; A controller, wherein the controller is configured to: obtain operating parameters of the air conditioner, determine an opening adjustment range of the electronic expansion valve according to changes in the operating parameters, and control the opening of the electronic expansion valve according to the opening adjustment range, wherein the operating parameters include the exhaust temperature of the compressor, the temperature of the condenser, the temperature of the evaporator and the opening of the electronic expansion valve.

2. The air conditioner according to claim 1, characterized in that: When determining the opening adjustment range of the electronic expansion valve according to the change of the operating parameter, the controller is specifically configured as follows: Whether to limit the opening adjustment range of the electronic expansion valve is determined according to the changes of the plurality of groups of operating parameters within a preset time, and the opening adjustment range of the electronic expansion valve is determined according to the determination result.

3. The air conditioner according to claim 2, characterized in that: When judging whether to limit the opening adjustment range of the electronic expansion valve according to the changes of the plurality of groups of operating parameters within a preset time, the controller is specifically configured as follows: Determining an upper deviation threshold and a lower deviation threshold of exhaust superheat according to the plurality of groups of operating parameters; When the upper deviation threshold and the lower deviation threshold are greater than a preset deviation value, the opening adjustment range of the electronic expansion valve is limited; When the upper deviation threshold and / or the lower deviation threshold is not greater than the preset deviation value, the opening adjustment range of the electronic expansion valve is not limited.

4. The air conditioner according to claim 2, characterized in that: When determining the opening adjustment range of the electronic expansion valve according to the judgment result, the controller is specifically configured as follows: When limiting the opening adjustment range of the electronic expansion valve, determining the target adjustment range of the opening of the electronic expansion valve after the limitation according to the plurality of groups of operating parameters, and using the target adjustment range as the opening adjustment range of the electronic expansion valve; When the opening adjustment range of the electronic expansion valve is not limited, the opening adjustment range of the electronic expansion valve is kept unchanged.

5. The air conditioner according to claim 3, characterized in that: When determining the upper deviation threshold and the lower deviation threshold of the exhaust superheat according to the plurality of groups of operating parameters, the controller is specifically configured as follows: Determining an upper deviation value and a lower deviation value of the exhaust gas superheat corresponding to each set of the operating parameters; The maximum value among the plurality of upper deviation values ​​is used as the upper deviation threshold of the exhaust superheat, and the maximum value among the plurality of lower deviation values ​​is used as the lower deviation threshold of the exhaust superheat.

6. The air conditioner according to claim 5, characterized in that: When determining the upper deviation value and the lower deviation value of the exhaust superheat corresponding to each set of the operating parameters, the controller is specifically configured as follows: Determining the exhaust gas superheat corresponding to each set of the operating parameters; The difference between the exhaust superheat corresponding to each set of the operating parameters and the target exhaust superheat is used as the upper deviation value of the exhaust superheat; and the difference between the target exhaust superheat and the exhaust superheat corresponding to each set of the operating parameters is used as the lower deviation value of the exhaust superheat.

7. The air conditioner according to claim 6, characterized in that: When determining the exhaust gas superheat corresponding to each set of the operating parameters, the controller is specifically configured as follows: When the air conditioner is in heating mode, the exhaust gas superheat corresponding to each set of the operating parameters is the difference between the exhaust gas temperature and the temperature of the evaporator; When the air conditioner is in cooling mode, the exhaust gas superheat corresponding to each set of the operating parameters is the difference between the exhaust gas temperature and the temperature of the condenser.

8. The air conditioner according to claim 4, characterized in that: When determining the target adjustment range of the opening degree of the electronic expansion valve after being limited according to the plurality of groups of operating parameters, the controller is specifically configured as follows: Determining the maximum opening and the minimum opening of the electronic expansion valve in the plurality of sets of operating parameters; The target adjustment range of the opening of the electronic expansion valve is determined according to the maximum opening and the minimum opening of the electronic expansion valve.

9. The air conditioner according to claim 8, characterized in that: When determining the target adjustment range of the opening of the electronic expansion valve after being limited according to the maximum opening and the minimum opening of the electronic expansion valve, the controller is specifically configured as follows: Calculating the difference between the maximum opening and the minimum opening; The target adjustment range of the opening degree of the electronic expansion valve is determined according to the difference between the maximum opening degree and the minimum opening degree.

10. The air conditioner according to claim 9, characterized in that: When determining the target adjustment range of the opening of the electronic expansion valve after the limit according to the difference between the maximum opening and the minimum opening, the controller is specifically configured as follows: When the difference between the maximum opening and the minimum opening is within a first preset difference range, the difference between the maximum opening and the preset opening is used as the upper limit of the target adjustment range, and the sum of the minimum opening and the preset opening is used as the lower limit of the target adjustment range; When the difference between the maximum opening and the minimum opening exceeds the upper limit of the first preset difference range, a first product of the difference between the maximum opening and the minimum opening and a first coefficient is calculated, and the difference between the maximum opening and the first product is used as the upper limit of the target adjustment range, and a second product of the difference between the maximum opening and the minimum opening and a second coefficient is calculated, and the sum of the minimum opening and the second product is used as the lower limit of the target adjustment range; When the difference between the maximum opening and the minimum opening does not exceed the lower limit of the first preset difference range, the opening adjustment range of the electronic expansion valve remains unchanged.

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