Control method and controller of air conditioner, air conditioner and readable storage medium

Abstract

The application provides a control method, a controller, an air conditioner and a readable storage medium, and the air conditioner comprises a compressor, an electronic expansion valve, a condenser, an evaporator and an economizer, the economizer is provided with a main refrigerant path and an auxiliary refrigerant path, one end of the main refrigerant path is connected to the condenser, the other end of the main refrigerant path is connected to the inlet of the auxiliary refrigerant path and the evaporator respectively, the outlet of the auxiliary refrigerant path is used for being connected to the air supplement port of the compressor, the electronic expansion valve is installed at the inlet of the auxiliary refrigerant path, and the method comprises the following steps: controlling the electronic expansion valve to be opened at an initial opening degree, and acquiring and adjusting the opening degree of the electronic expansion valve according to the auxiliary path superheat degree of the economizer, the first exhaust superheat degree of the compressor and the operating current value of the air conditioner, wherein the application can more accurately and effectively control the spray enthalpy flow, improve the spray enthalpy effect and thus improve the heating effect, and prevent problems such as back liquid in the air supplement process, operation frequency fluctuation of the unit and the like, so as to ensure the reliability of the compressor and increase the service life of the air conditioner.

Description

Technical Field

[0001] This invention relates to the field of air conditioner technology, and in particular to an air conditioner control method, controller, air conditioner, and readable storage medium. Background Technology

[0002] In current air conditioners, to solve the heating problem of multi-split heat pump systems in low-temperature environments, there is a jet enthalpy enhancement technology. The specific solution is to introduce medium-pressure refrigerant gas into the compressor through the refrigerant auxiliary circuit of the economizer, thereby replenishing the compressor with gas. This allows the compressor to compress the refrigerant after the primary return gas compression, improving the heating effect of the air conditioner in low-temperature environments.

[0003] The current control method for the electronic expansion valve in the economizer (heat exchanger) is to control the electronic expansion valve to open for gas replenishment only when the outdoor operating conditions meet the conditions for the gas injection enthalpy function to be activated, based on the air conditioner's operating parameters.

[0004] However, the control method of this electronic expansion valve has too simple a control condition for the injection enthalpy function and the electronic expansion valve control adjustment, which cannot accurately and effectively control the injection enthalpy flow rate. As a result, it cannot ensure a high-efficiency injection enthalpy effect, which in turn affects the final heating effect. At the same time, it is also prone to problems such as liquid return and fluctuations in the unit's operating frequency when running at high-frequency limiting current, which affects the reliability of the compressor and poses a great risk of causing great damage to the compressor, reducing the service life of the air conditioner and increasing the user's operating costs. Summary of the Invention

[0005] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a control method, controller, air conditioner, and readable storage medium for an air conditioner, which can more accurately and effectively control the injection enthalpy flow rate, improve the injection enthalpy effect and thus improve the heating effect, and prevent problems such as liquid return and unit operating frequency fluctuations during the gas replenishment process, thereby ensuring compressor reliability and increasing the service life of the air conditioner.

[0006] In a first aspect, embodiments of the present invention provide a control method for an air conditioner, the air conditioner including a compressor, an electronic expansion valve, a condenser, an evaporator, and an economizer. The economizer is provided with a refrigerant main circuit and a refrigerant auxiliary circuit. One end of the refrigerant main circuit is connected to the condenser, and the other end is connected to the inlet of the refrigerant auxiliary circuit and the evaporator, respectively. The outlet of the refrigerant auxiliary circuit is connected to the compressor's gas injection port. The electronic expansion valve is installed at the inlet of the refrigerant auxiliary circuit. The method includes: controlling the electronic expansion valve to open at an initial opening degree, and acquiring the auxiliary circuit superheat of the economizer, the first discharge superheat of the compressor, and the operating current value of the air conditioner; adjusting the opening degree of the electronic expansion valve according to the auxiliary circuit superheat, the first discharge superheat, and the operating current value; wherein, the auxiliary circuit superheat is the difference between the temperature at the outlet of the refrigerant auxiliary circuit and the temperature at the inlet of the refrigerant auxiliary circuit, and the first discharge superheat is the difference between the discharge temperature and the saturation temperature of the compressor.

[0007] The air conditioner control method according to embodiments of the present invention has at least the following beneficial effects: when the electronic expansion valve is opened at its initial opening, the refrigerant flowing from the condenser to the economizer enters the economizer's refrigerant auxiliary circuit. However, if the refrigerant flow rate through the auxiliary circuit is too high, the refrigerant may not be able to completely change from a gas-liquid mixture to a gaseous state, resulting in liquid return and causing liquid slugging on the vapor injection enthalpy-increasing compressor. Therefore, this application obtains the economizer's auxiliary circuit superheat, the compressor's first discharge superheat, and the air conditioner's operating current value, and adjusts the refrigerant flow through the auxiliary circuit more accurately and effectively based on these values. The system is designed to ensure that the refrigerant flowing out of the auxiliary refrigerant circuit and into the compressor is in a gaseous state, thereby improving the injection enthalpy effect and thus the heating effect. During the gas replenishment process, the operating current value is monitored to prevent fluctuations in the unit's operating frequency when operating at high-frequency limiting currents. This reduces the frequency of problems such as liquid return and unit operating frequency fluctuations, ensuring compressor reliability and increasing the service life of the air conditioner. The auxiliary circuit superheat is the difference between the outlet temperature and the inlet temperature of the auxiliary refrigerant circuit, used to determine whether the refrigerant flowing through the auxiliary circuit can completely change from a gas-liquid mixture to a gaseous state. The first exhaust superheat is the difference between the compressor's exhaust temperature and its saturation temperature.

[0008] In some embodiments, adjusting the opening of the electronic expansion valve based on the auxiliary circuit superheat, the first exhaust superheat, and the operating current value includes: when the first exhaust superheat is less than a first preset lower limit, controlling the electronic expansion valve to reduce its current opening by a preset first step opening; when the first exhaust superheat is greater than or equal to the first preset lower limit and less than or equal to a first preset upper limit, adjusting the opening of the electronic expansion valve based on the auxiliary circuit superheat; and when the first exhaust superheat is greater than the first preset upper limit, adjusting the opening of the electronic expansion valve based on the auxiliary circuit superheat and the operating current value.

[0009] In some embodiments, adjusting the opening of the electronic expansion valve according to the auxiliary circuit superheat includes: when the auxiliary circuit superheat is less than a second preset lower limit, controlling the electronic expansion valve to reduce the current opening by a preset second step opening; or, when the auxiliary circuit superheat is greater than or equal to the second preset lower limit, controlling the electronic expansion valve to maintain the current opening.

[0010] In some embodiments, adjusting the opening of the electronic expansion valve according to the auxiliary circuit superheat and the operating current value includes: when the auxiliary circuit superheat is less than a second preset lower limit, controlling the electronic expansion valve to reduce the current opening by a preset second step opening; when the auxiliary circuit superheat is greater than or equal to the second preset lower limit and less than or equal to the second preset upper limit, controlling the electronic expansion valve to maintain the current opening; and when the auxiliary circuit superheat is greater than the second preset upper limit, adjusting the opening of the electronic expansion valve according to the operating current value.

[0011] In some embodiments, adjusting the opening of the electronic expansion valve according to the operating current value includes: when the operating current value is less than a lower limit current value, controlling the electronic expansion valve to increase the current opening by a preset third step opening; when the operating current value is greater than or equal to the lower limit current value and less than or equal to the upper limit current value, controlling the electronic expansion valve to increase the current opening by a preset fourth step opening, wherein the fourth step opening is less than the third step opening; and when the operating current value is greater than the upper limit current value, controlling the electronic expansion valve to maintain the current opening.

[0012] In some embodiments, before adjusting the opening of the electronic expansion valve according to the operating current value, the method further includes: determining the lower limit current value according to the unit frequency limiting current of the air conditioner and a first proportional coefficient, and determining the upper limit current value according to the unit frequency limiting current and a second proportional coefficient; determining the fourth step opening according to the third step opening and a third coefficient; wherein the second proportional coefficient is greater than the first proportional coefficient, and the third coefficient is greater than zero and less than one.

[0013] In some embodiments, controlling the electronic expansion valve to open at an initial opening degree includes: controlling the electronic expansion valve to open at the initial opening degree when the air conditioner is detected to meet preset opening conditions; wherein the opening conditions include at least one of the following: the ambient temperature is less than or equal to a preset temperature threshold; the operating frequency of the compressor is greater than or equal to a preset frequency threshold; and the second exhaust superheat of the compressor is greater than or equal to a preset superheat threshold.

[0014] In some embodiments, before controlling the electronic expansion valve to open at an initial opening, the method further includes: obtaining a second exhaust superheat of the compressor; and determining the initial opening based on the second exhaust superheat of the compressor.

[0015] In some embodiments, the air conditioner further includes an enthalpy injection solenoid valve, which is installed at the outlet of the refrigerant auxiliary circuit. Before controlling the electronic expansion valve to open at an initial opening, the air conditioner further includes controlling the enthalpy injection solenoid valve to open.

[0016] In some embodiments, after adjusting the opening of the electronic expansion valve according to the auxiliary circuit superheat, the first exhaust superheat, and the operating current value, the method further includes: controlling the electronic expansion valve and the enthalpy injection solenoid valve to close when the air conditioner is detected to meet a preset shutdown condition; wherein the shutdown condition includes at least one of the following: the ambient temperature is greater than a preset temperature threshold; a first instruction for controlling the air conditioner to perform a shutdown process is obtained; a second instruction for controlling the air conditioner to perform a mode switching process is obtained; a first signal indicating that the air conditioner is in a unit defrosting state is obtained; and a second signal indicating that the air conditioner is in a unit oil return state is obtained.

[0017] In a second aspect, embodiments of the present invention provide a controller, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the control method of the air conditioner as described in any one of the first aspects above.

[0018] Thirdly, embodiments of the present invention provide an air conditioner, including the controller described in the second aspect above.

[0019] Fourthly, embodiments of the present invention provide a computer-readable storage medium storing computer-executable instructions for performing the control method of an air conditioner as described in any one of the first aspects above.

[0020] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description and the drawings. Attached Figure Description

[0021] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the technical solutions of the present invention, and do not constitute a limitation on the technical solutions of the present invention.

[0022] Figure 1 This is a schematic diagram of the structure of an air conditioner provided in one embodiment of the present invention;

[0023] Figure 2 This is a flowchart of an air conditioner control method provided in another embodiment of the present invention;

[0024] Figure 3 This is a flowchart of another embodiment of the present invention, which describes the adjustment of the opening of the electronic expansion valve based on the auxiliary circuit superheat, the first exhaust superheat, and the operating current value;

[0025] Figure 4 This is a flowchart of adjusting the opening of the electronic expansion valve according to the overheat of the auxiliary circuit, provided by another embodiment of the present invention;

[0026] Figure 5 This is a flowchart of another embodiment of the present invention, showing how to adjust the opening of an electronic expansion valve based on the auxiliary circuit overheat and operating current value;

[0027] Figure 6 This is a flowchart of adjusting the opening of the electronic expansion valve according to the operating current value, provided by another embodiment of the present invention;

[0028] Figure 7 This is a flowchart for determining the initial opening degree provided in another embodiment of the present invention;

[0029] Figure 8 This is a flowchart for determining a second preset upper limit value and a second preset lower limit value, provided by another embodiment of the present invention;

[0030] Figure 9 This is a complete flowchart of an air conditioner control method provided in another embodiment of the present invention;

[0031] Figure 10 This is a schematic diagram of a controller for performing a control method for an air conditioner, provided in another embodiment of the present invention.

[0032] Reference numerals: 110, Compressor; 111, Gas inlet; 120, Electronic expansion valve; 130, Condenser; 140, Evaporator; 150, Economizer; 151, First end of refrigerant main line; 152, Second end of refrigerant main line; 153, Inlet of refrigerant auxiliary line; 154, Outlet of refrigerant auxiliary line; 160, Injection enthalpy solenoid valve; 171, First temperature sensor; 172, Second temperature sensor. Detailed Implementation

[0033] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0034] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0035] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0036] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0037] In current air conditioners, to address the heating problem of multi-split heat pump systems in low-temperature environments, there exists a vapor injection enthalpy enhancement technology. This technology involves introducing medium-pressure refrigerant gas into the compressor through the refrigerant auxiliary circuit of the economizer, thus replenishing the compressor and enabling it to recompress the refrigerant after primary return gas compression, improving the air conditioner's heating performance in low-temperature environments. Currently, the control method for the electronic expansion valve in the economizer (heat exchanger) only activates the vapor injection enthalpy enhancement function under outdoor conditions, based on the air conditioner's operating parameters. However, this method's activation conditions and valve control are too simplistic, failing to accurately and effectively control the injection enthalpy flow rate. This compromises efficient enthalpy injection, affecting the final heating performance. Furthermore, it is prone to issues such as liquid return and fluctuations in unit operating frequency during high-frequency limiting current operation, impacting compressor reliability, posing a significant risk of compressor damage, reducing the air conditioner's lifespan, and increasing user operating costs.

[0038] Based on the above, embodiments of the present invention provide a control method, controller, air conditioner, and readable storage medium for an air conditioner. The air conditioner includes a compressor, an electronic expansion valve, a condenser, an evaporator, and an economizer. The economizer has a main refrigerant path and an auxiliary refrigerant path. One end of the main refrigerant path is connected to the condenser, and the other end is connected to the inlet of the auxiliary refrigerant path and the evaporator, respectively. The outlet of the auxiliary refrigerant path is connected to the compressor's gas injection port. The electronic expansion valve is installed at the inlet of the auxiliary refrigerant path. When the electronic expansion valve is opened at its initial opening, the refrigerant flowing from the condenser to the economizer enters the economizer's auxiliary refrigerant path. However, if the refrigerant flow rate through the auxiliary refrigerant path is too fast, the refrigerant may not be able to completely change from a gas-liquid mixture to a gaseous state, resulting in liquid return and causing liquid slugging in the vapor injection enthalpy compressor. Therefore, this application addresses this issue by obtaining the superheat and pressure of the economizer's auxiliary path. The system uses the compressor's first exhaust superheat and the air conditioner's operating current value, along with the auxiliary circuit superheat, first exhaust superheat, and operating current value, to more accurately and effectively adjust the refrigerant flow rate through the refrigerant auxiliary circuit. This ensures that the refrigerant flowing out of the auxiliary circuit and into the compressor is gaseous, thereby improving the injection enthalpy effect and thus the heating effect. During the gas replenishment process, the operating current value is monitored to prevent unit operating frequency fluctuations at high-frequency limiting currents, thereby reducing the frequency of problems such as liquid return and unit operating frequency fluctuations, ensuring compressor reliability and increasing the air conditioner's lifespan. The auxiliary circuit superheat is the difference between the refrigerant auxiliary circuit outlet temperature and the refrigerant auxiliary circuit inlet temperature, used to determine whether the refrigerant flowing through the auxiliary circuit can completely change from a gas-liquid mixture to a gaseous state. The first exhaust superheat is the difference between the compressor's exhaust temperature and its saturation temperature.

[0039] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0040] like Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of an air conditioner provided in one embodiment of the present invention. In some embodiments, the air conditioner mentioned in this application includes a compressor 110, an electronic expansion valve 120, a condenser 130, an evaporator 140, and an economizer 150. The economizer 150 is internally provided with a refrigerant main circuit and a refrigerant auxiliary circuit. One end of the refrigerant main circuit is connected to the condenser 130, and the other end is connected to the refrigerant auxiliary circuit inlet 153 and the evaporator 140, respectively. The refrigerant auxiliary circuit outlet 154 is connected to the gas supply port 111 of the compressor 110. The electronic expansion valve 120 is installed at the refrigerant auxiliary circuit inlet 153; correspondingly Figure 1 The first end 151 of the main refrigerant circuit is connected to the inlet 153 of the auxiliary refrigerant circuit and the evaporator 140 respectively. The outlet 154 of the auxiliary refrigerant circuit is connected to the gas supply port 111 of the compressor 110. One end of the electronic expansion valve 120 is connected to the inlet 153 of the auxiliary refrigerant circuit, and the other end of the electronic expansion valve 120 is connected to the second end 152 of the main refrigerant circuit.

[0041] In some embodiments, the air conditioner in this application is a multi-split vapor injection enthalpy air conditioner, and the compressor 110 is a vapor injection enthalpy compressor 110. The air conditioner in this application operates in a low-temperature heating application scenario. The first end 151 of the refrigerant main line is the refrigerant main line inlet, and the second end 152 of the refrigerant main line is the refrigerant main line outlet. One end of the electronic expansion valve 120 is connected to the refrigerant auxiliary line inlet 153, and the other end of the electronic expansion valve 120 is connected to the refrigerant main line outlet. The refrigerant main line inlet is connected to the condenser 130.

[0042] In some embodiments, the refrigerant in the air conditioner provided in this embodiment of the invention flows as follows: the refrigerant flows out from the condenser 130, enters the main refrigerant circuit of the economizer 150 through the main refrigerant circuit inlet, and flows out from the main refrigerant circuit outlet of the economizer 150. Part of the refrigerant flows to the evaporator 140, and another part passes through the electronic expansion valve 120 and enters the auxiliary refrigerant circuit of the economizer 150 through the auxiliary refrigerant circuit inlet 153, and flows out from the auxiliary refrigerant circuit outlet 154. The refrigerant flowing through the auxiliary refrigerant circuit and the refrigerant flowing through the main refrigerant circuit will interact in the economizer 150. Heat exchange occurs internally. The refrigerant flowing out from the refrigerant auxiliary outlet 154 flows into the compressor 110 through the gas inlet 111 on the compressor 110. This allows the medium-pressure refrigerant gas from the economizer 150 auxiliary outlet to enter the middle pressure chamber of the compressor 110 through the gas inlet 111. The gas mixes with the refrigerant that has undergone primary return gas compression in the middle pressure chamber and is compressed again. This allows the compressor 110 to discharge a larger flow of high-temperature, high-pressure refrigerant into the condenser 130, improving the air conditioner's heating capacity and compression ratio in low-temperature environments, while also improving the reliability of the compressor 110 under high-pressure conditions.

[0043] like Figure 2 As shown, Figure 2 This is a flowchart of an air conditioner control method according to another embodiment of the present invention. In some embodiments, the air conditioner control method includes, but is not limited to, the following steps:

[0044] Step S210: Control the electronic expansion valve to open at the initial opening degree, and obtain the auxiliary circuit superheat of the economizer, the first discharge superheat of the compressor, and the operating current value of the air conditioner.

[0045] Step S220: Adjust the opening of the electronic expansion valve according to the auxiliary road superheat, the first exhaust superheat, and the operating current value.

[0046] In some embodiments, the auxiliary circuit superheat is the difference between the temperature at the outlet of the refrigerant auxiliary circuit and the temperature at the inlet of the refrigerant auxiliary circuit, and the first discharge superheat is the difference between the discharge temperature and the saturation temperature of the compressor. The economizer includes, but is not limited to, heat exchangers such as plate heat exchangers or shell-and-tube heat exchangers. This application ensures that the refrigerant at the injection enthalpy port has a certain appropriate superheat by adding control conditions to the electronic expansion valve, which can effectively prevent liquid return during the gas replenishment process, thereby ensuring the reliability of the compressor. Compared with the prior art, the operating current is added to the opening conditions of the auxiliary circuit electronic expansion valve, thereby obtaining and adjusting the opening degree of the electronic expansion valve according to the auxiliary circuit superheat of the economizer, the first discharge superheat of the compressor and the operating current value of the air conditioner.

[0047] In some embodiments, when the electronic expansion valve is open, the refrigerant auxiliary circuit of the economizer is connected, and a portion of the refrigerant flows into the refrigerant auxiliary circuit to exchange heat with the main refrigerant circuit. If the electronic expansion valve is opened too wide, the refrigerant flow rate will be too fast, preventing sufficient heat exchange between the refrigerant in the auxiliary circuit and the refrigerant in the main refrigerant circuit. This results in the refrigerant in the auxiliary circuit not being completely converted to a gaseous state, which can cause liquid slugging damage to the compressor during the injection enthalpy compressor's gas replenishment operation. If the electronic expansion valve is opened too narrowly, meaning the heating effect is already sufficient, maintaining the current opening will result in wasted energy for the entire air conditioner. Therefore, in this application, after the electronic expansion valve opens to its initial opening, the flow rate of the economizer's auxiliary circuit is monitored. The operating current of the air conditioner is used as a basis for determining whether the opening of the electronic expansion valve is appropriate during air conditioner operation. This is achieved by adjusting the opening of the electronic expansion valve based on the following factors: the superheat of the economizer's auxiliary circuit, the superheat of the compressor's first discharge, and the operating current of the air conditioner. This, in turn, adjusts the refrigerant flow rate through the refrigerant auxiliary circuit, ensuring that only gaseous refrigerant flows out of the refrigerant auxiliary circuit and into the vapor injection enthalpy-enhancing compressor. This significantly reduces liquid return, increases the service life of the air conditioner, and allows for more precise control of the electronic expansion valve opening, ensuring the effectiveness of vapor injection enthalpy enhancement and thus improving the heating performance of the air conditioner.

[0048] In some embodiments, the air conditioner is provided with a current detection unit for detecting the operating current value of the air conditioner. The operating current value of the air conditioner is the operating current of the entire air conditioner unit. The current is judged according to a preset proportional coefficient and the unit frequency limiting current to prevent the unit from running at a high frequency frequency limiting current. This is because the unit's operating current suddenly increases due to the opening of the injection enthalpy, which would trigger the unit's protection frequency limiting and cause fluctuations in the unit's operating frequency, thereby affecting the unit's heating performance. This ensures that the unit can operate reliably and stably under the premise of strong heating in a low-temperature environment.

[0049] In some embodiments, reference Figure 1 This application also includes a first temperature sensor 171 and a second temperature sensor 172. The first temperature sensor 171 and the second temperature sensor 172 are used to obtain the auxiliary circuit superheat. The auxiliary circuit superheat is the difference between the temperature at the outlet of the refrigerant auxiliary circuit and the temperature at the inlet of the refrigerant auxiliary circuit. A first temperature sensor 171 is required at the inlet of the refrigerant auxiliary circuit of the economizer to obtain the temperature at the inlet of the refrigerant auxiliary circuit; and a second temperature sensor 172 is required at the outlet of the refrigerant auxiliary circuit to obtain the temperature at the outlet of the refrigerant auxiliary circuit.

[0050] In some embodiments, the first exhaust superheat is the difference between the exhaust temperature at the exhaust port of the vapor injection enthalpy compressor and the saturation temperature at the current exhaust pressure. This requires a third temperature sensor and a first high-pressure sensor at the exhaust port where the compressor connects to the condenser. The third temperature sensor is used to obtain the exhaust temperature at the exhaust port of the vapor injection enthalpy compressor, and the first high-pressure sensor is used to obtain the exhaust pressure at the exhaust port of the vapor injection enthalpy compressor, thereby obtaining the first exhaust superheat.

[0051] like Figure 3 As shown, Figure 3 This is a flowchart of another embodiment of the present invention, which describes adjusting the opening of the electronic expansion valve based on the auxiliary circuit superheat, the first exhaust superheat, and the operating current value. In some embodiments, adjusting the opening of the electronic expansion valve based on the auxiliary circuit superheat, the first exhaust superheat, and the operating current value includes, but is not limited to, the following steps:

[0052] Step S310: If the first exhaust superheat is less than the first preset lower limit, control the electronic expansion valve to reduce the current opening by a preset first step opening.

[0053] Step S320: When the first exhaust superheat is greater than or equal to the first preset lower limit and less than or equal to the first preset upper limit, adjust the opening of the electronic expansion valve according to the auxiliary circuit superheat.

[0054] In step S330, if the first exhaust superheat is greater than the first preset upper limit value, the opening of the electronic expansion valve is adjusted according to the auxiliary circuit superheat and the operating current value.

[0055] In some embodiments, the present invention sets a first preset lower limit and a first preset upper limit for the first exhaust superheat. The first preset upper limit is greater than the first preset lower limit. The first preset lower limit is used to characterize whether the heating effect of the current air conditioner meets the heating requirements. That is, when the first exhaust superheat is less than the first preset lower limit, it indicates that the heating effect of the air conditioner cannot meet the heating requirements. When the first exhaust superheat is greater than or equal to the first preset lower limit, it indicates that the heating effect of the air conditioner meets the requirements. When the first exhaust superheat is greater than or equal to the first preset lower limit and less than or equal to the first preset upper limit, it indicates that the heating effect of the air conditioner meets the heating requirements, and the energy consumption of the air conditioner also meets the energy consumption requirements. At this time, the opening of the electronic expansion valve is adjusted according to the auxiliary circuit superheat. The auxiliary circuit superheat is used to determine whether, during the heating process, after the electronic expansion valve is opened, the refrigerant participating in the gas replenishment operation has completely turned into gaseous refrigerant before entering the jet enthalpy compressor.

[0056] like Figure 4 As shown, Figure 4This is a flowchart of adjusting the opening of the electronic expansion valve according to the auxiliary circuit superheat, provided by another embodiment of the present invention. In some embodiments, the opening of the electronic expansion valve is adjusted according to the auxiliary circuit superheat and the operating current value, including but not limited to the following steps:

[0057] Step S410: When the overheat of the auxiliary circuit is less than the second preset lower limit, control the electronic expansion valve to reduce the current opening by a preset second step opening.

[0058] Step S420, or, if the auxiliary circuit overheat is greater than or equal to the second preset lower limit, control the electronic expansion valve to maintain the current opening.

[0059] In some embodiments, the present invention sets a second preset lower limit value for the superheat of the auxiliary circuit. This second preset lower limit value characterizes whether the refrigerant flowing out of the economizer's auxiliary circuit and into the vapor injection enthalpy-enhancing compressor is entirely gaseous. Specifically, when the superheat of the auxiliary circuit is less than the second preset lower limit value, the refrigerant flowing out of the economizer's auxiliary circuit and into the vapor injection enthalpy-enhancing compressor is considered to be in a gas-liquid mixture state. If this gas-liquid mixture enters the vapor injection enthalpy-enhancing compressor, it will cause liquid slugging damage, resulting in insufficient heating performance and a significantly shortened lifespan for the vapor injection enthalpy-enhancing compressor. To significantly reduce the refrigerant flow rate, it is necessary to control the electronic expansion valve to reduce its current opening by a preset first step opening at a first time interval. Reducing the opening of the electronic expansion valve can decrease the refrigerant flow rate and increase the time for heat exchange between the main refrigerant path and the auxiliary refrigerant path of the economizer. This allows the refrigerant in the auxiliary refrigerant path, which is in a gas-liquid mixed state, to fully absorb heat and completely turn into a gaseous state. This continues until the superheat of the auxiliary path is greater than or equal to the second preset lower limit value. At this point, when the refrigerant flowing out of the economizer's auxiliary refrigerant path and entering the jet enthalpy compressor is completely gaseous, the control of the electronic expansion valve to reduce its current opening will stop.

[0060] like Figure 5 As shown, Figure 5 This is a flowchart of another embodiment of the present invention, showing how to adjust the opening of an electronic expansion valve based on the auxiliary circuit superheat and operating current value. In some embodiments, adjusting the opening of the electronic expansion valve based on the auxiliary circuit superheat and operating current value includes, but is not limited to, the following steps:

[0061] Step S510: When the overheat of the auxiliary circuit is less than the second preset lower limit, control the electronic expansion valve to reduce the current opening by a preset second step opening.

[0062] Step S520: When the overheat of the auxiliary road is greater than or equal to the second preset lower limit and less than or equal to the second preset upper limit, control the electronic expansion valve to maintain the current opening.

[0063] In step S530, when the overheat of the auxiliary circuit is greater than the second preset upper limit value, the opening of the electronic expansion valve is adjusted according to the operating current value.

[0064] In some embodiments, if the auxiliary circuit superheat is less than the second preset lower limit, it indicates that the refrigerant in the compressor is in a gas-liquid mixture state. If this gas-liquid mixture enters the compressor, it will cause liquid slugging damage, preventing the heating effect from meeting the preset requirements. Therefore, the electronic expansion valve needs to be controlled to reduce its current opening by a preset second step opening. If the auxiliary circuit superheat is greater than or equal to the second preset lower limit and less than or equal to the second preset upper limit, it indicates that the refrigerant in the compressor is completely gaseous, meaning the current heating effect meets the preset requirements. Therefore, the electronic expansion valve is controlled to maintain its current opening. If the auxiliary circuit superheat is greater than the second preset lower limit, it indicates that the refrigerant in the compressor is completely gaseous, meaning the current heating effect meets the preset requirements. Therefore, the electronic expansion valve is controlled to maintain its current opening. The upper limit indicates that the heating effect has reached the preset heating requirement. At this point, in order to further reduce the opening of the electronic expansion valve or maintain the current opening and increase power consumption unnecessarily, the opening of the electronic expansion valve is adjusted according to the operating current value until the auxiliary circuit superheat is less than or equal to the second preset upper limit value. This ensures that the heating effect of the air conditioner reaches the preset heating requirement and also ensures that there is no unnecessary increase in power consumption during the gas replenishment operation. At the same time, current judgment is performed to prevent the air conditioner unit from running at a high frequency limiting current. This is because the opening of the injection enthalpy causes a sudden increase in the unit's operating current, which may trigger the unit's protection frequency limiting and cause fluctuations in the unit's operating frequency.

[0065] like Figure 6 As shown, Figure 6 This is a flowchart of adjusting the opening of an electronic expansion valve according to an operating current value, provided by another embodiment of the present invention. In some embodiments, adjusting the opening of the electronic expansion valve according to the operating current value includes, but is not limited to, the following steps:

[0066] Step S610: When the operating current value is less than the lower limit current value, control the electronic expansion valve to increase the current opening by a preset third step opening.

[0067] Step S620: When the operating current value is greater than or equal to the lower limit current value and less than or equal to the upper limit current value, control the electronic expansion valve to increase the current opening by a preset fourth step opening degree, wherein the fourth step opening degree is less than the third step opening degree.

[0068] Step S630: When the operating current value is greater than the upper limit current value, control the electronic expansion valve to maintain the current opening.

[0069] In some embodiments, if the operating current value is less than the lower limit current value, it indicates that the current operating current value is within a safe current range. Therefore, the current opening degree can be increased by a preset third step opening degree until the auxiliary circuit superheat is less than or equal to the second preset upper limit value, ensuring that the heating effect of the air conditioner meets the preset heating requirements. If the operating current value is greater than or equal to the lower limit current value and less than or equal to the upper limit current value, it indicates that the current operating current value is high. Therefore, the current opening degree is increased by a fourth step opening degree smaller than the third step opening degree. By reducing the step opening degree, the current of the air conditioner unit is prevented from reaching the high-frequency limiting current, which would affect the reliability of the air conditioner unit in heating in low-temperature environments.

[0070] In some embodiments, the first preset upper limit value, the first preset lower limit value, the second preset upper limit value, the second preset lower limit value, the first step opening degree, the second step opening degree, the third step opening degree, and the fourth step opening degree described above may be pre-defined by those skilled in the art according to actual application scenarios, and do not constitute a limitation on the scope of protection of the present invention.

[0071] In some embodiments, before adjusting the opening of the electronic expansion valve according to the operating current value, the method further includes: determining a lower limit current value based on the unit frequency limiting current of the air conditioner and a first proportional coefficient, and determining an upper limit current value based on the unit frequency limiting current and a second proportional coefficient; determining a fourth step opening based on a third step opening and a third coefficient; wherein the second proportional coefficient is greater than the first proportional coefficient, and the third coefficient is greater than zero and less than one.

[0072] In some embodiments, controlling the electronic expansion valve to open at an initial opening degree includes: controlling the electronic expansion valve to open at an initial opening degree when it is detected that the air conditioner meets a preset opening condition; wherein the opening condition includes at least one of the following: the ambient temperature is less than or equal to a preset temperature threshold; the operating frequency of the compressor is greater than or equal to a preset frequency threshold; the second exhaust superheat of the compressor is greater than or equal to a preset superheat threshold.

[0073] In some embodiments, the activation conditions include: the ambient temperature being less than or equal to a preset temperature threshold, the compressor's operating frequency being greater than or equal to a preset frequency threshold, and the compressor's second exhaust superheat being greater than or equal to a preset superheat threshold. Specifically, when the outdoor ambient temperature is less than or equal to a certain temperature, the air conditioner's original heating circuit alone cannot meet the heating requirements. In this case, the electronic expansion valve needs to be opened, and an economizer is used for gas replenishment to enhance the air conditioner's heating effect. Therefore, a preset temperature threshold is set. When the outdoor ambient temperature is less than or equal to the preset temperature threshold, the electronic expansion valve is controlled to open at its initial opening. When the operating frequency of the vapor injection enthalpy compressor is less than a certain frequency, the electronic expansion valve is opened, and an economizer is used for gas replenishment. There are instances where effective injection enthalpy cannot be achieved, which can actually reduce the heating effect of the air conditioner. Therefore, a preset frequency threshold is set. The electronic expansion valve is only opened at its initial opening when the operating frequency of the injection enthalpy compressor is greater than or equal to the preset frequency threshold. When the second exhaust superheat of the injection enthalpy compressor is less than a certain exhaust superheat, the electronic expansion valve is opened and gas is supplied using the economizer. However, due to the low second exhaust superheat, the refrigerant supplied for gas supply may not be completely converted into gaseous refrigerant, causing liquid slugging damage to the injection enthalpy compressor. Therefore, a preset superheat threshold is set. The electronic expansion valve is only opened at its initial opening when the second exhaust superheat of the injection enthalpy compressor is greater than or equal to the preset superheat threshold.

[0074] like Figure 7 As shown, Figure 7 This is a flowchart for determining the initial opening degree provided by another embodiment of the present invention. In some embodiments, before controlling the electronic expansion valve to open at the initial opening degree, the following steps are included, but not limited to:

[0075] Step S710: Obtain the second exhaust superheat of the compressor;

[0076] Step S720: Determine the initial opening degree based on the second exhaust superheat of the compressor.

[0077] Specifically, as shown in Table (1) below:

[0078] Table (1)

[0079]

[0080] Referring to Table (1), this invention obtains the second exhaust superheat of the compressor, determines the initial opening degree based on its relationship with the preset stable range, and then precisely controls the opening degree of the electronic expansion valve to ensure the effect of gas replenishment and enthalpy increase, thereby improving the heating effect of the air conditioner. For example, if the second exhaust superheat is greater than or equal to 10°C and less than 15°C, the initial opening degree is determined as step A1; if the second exhaust superheat is greater than or equal to 15°C and less than or equal to 25°C, the initial opening degree is determined as step A2; if the second exhaust superheat is greater than 25°C, the initial opening degree is determined as step A3. Step A1 is greater than step A2, and step A2 is greater than step A3, so that the higher the superheat, the higher the initial opening degree. The initial opening degree of the electronic expansion valve is adjusted according to the exhaust superheat, thereby improving the heating effect.

[0081] like Figure 8 As shown, Figure 8 This is a flowchart of determining a second preset upper limit value and a second preset lower limit value provided by another embodiment of the present invention. In some embodiments, the control method of the air conditioner includes, but is not limited to, the following steps:

[0082] Step S810: Obtain the ambient temperature;

[0083] Step S820: Determine the second preset upper limit value and the second preset lower limit value based on the ambient temperature.

[0084] Specifically, as shown in Table (2) below:

[0085] Table (2)

[0086]

[0087] Referring to Table (2), this invention obtains the ambient temperature T4 and determines the second preset upper limit and the second preset lower limit based on the ambient temperature T4. Specifically, when the ambient temperature is greater than 6°C, the second preset upper limit (target superheat TFsh1) is set to 4°C and the second preset lower limit (target superheat TFsh2) is set to 8°C; when the ambient temperature is greater than or equal to -7°C and less than or equal to 6°C, the second preset upper limit (target superheat TFsh1) is set to 3°C and the second preset lower limit (target superheat TFsh2) is set to 7°C; when the ambient temperature is less than -7°C, the second preset upper limit (target superheat TFsh1) is set to 2°C and the second preset lower limit (target superheat TFsh2) is set to 6°C. This ensures that the lower the ambient temperature, the lower the ideal superheat corresponding to the target superheat range, allowing for more precise control of the opening of the electronic expansion valve, thereby improving the heating effect.

[0088] refer to Figure 1In some embodiments, the air conditioner also includes an enthalpy injection solenoid valve 160, which is installed at the outlet of the refrigerant auxiliary circuit. Before the electronic expansion valve is opened to its initial opening, the air conditioner also includes controlling the opening of the enthalpy injection solenoid valve 160. By adding the enthalpy injection solenoid valve 160, the present invention controls the shut-off of the circuit between the economizer and the compressor, thereby further preventing liquid return and reducing the possibility of liquid return to the compressor due to improper adjustment of the enthalpy injection flow, thereby improving the overall reliability of the unit.

[0089] In some embodiments, after adjusting the opening of the electronic expansion valve according to the auxiliary circuit superheat, the first exhaust superheat, and the operating current value, the method further includes: controlling the electronic expansion valve and the enthalpy injection solenoid valve 160 to close when the air conditioner is detected to meet preset shutdown conditions; wherein the shutdown conditions include at least one of the following: the ambient temperature is greater than a preset temperature threshold; a first instruction for controlling the air conditioner to perform shutdown processing is obtained; a second instruction for controlling the air conditioner to perform mode switching processing is obtained; a first signal indicating that the air conditioner is in the unit defrosting state is obtained; and a second signal indicating that the air conditioner is in the unit oil return state is obtained. The present invention effectively prevents the compressor from returning liquid due to refrigerant migration during the shutdown process by controlling the enthalpy injection solenoid valve 160 to close when any of the following conditions are met: ambient temperature greater than a preset temperature threshold, unit oil return, unit defrosting, unit shutdown, or mode switching.

[0090] like Figure 9 As shown, Figure 9 This is a complete flowchart of an air conditioner control method provided in another embodiment of the present invention. The air conditioner control method provided in this embodiment of the present invention includes, but is not limited to, the following steps S901 to S917.

[0091] Step S901: Power on and enter heating mode;

[0092] Step S902: Determine whether the outdoor ambient temperature is less than or equal to T1. If yes, proceed to step SS903; otherwise, do not activate the jet enthalpy enhancement function.

[0093] Step S903: Determine whether the compressor frequency is greater than or equal to Fr1. If yes, proceed to step SS904; otherwise, do not activate the vapor injection enthalpy enhancement function.

[0094] Step S904: Determine whether the superheat of the second exhaust is greater than or equal to T2. If yes, proceed to step S905; otherwise, do not activate the jet enthalpy enhancement function.

[0095] Step S905: Control the electronic expansion valve to open at an initial opening degree, wherein the initial opening degree is related to the second exhaust superheat degree;

[0096] Step S906: Determine whether the first exhaust superheat is greater than or equal to TPsh1 and less than or equal to TPsh2. If yes, proceed to step S908; if no and the first exhaust superheat is less than TPsh1, proceed to step S907; if no and the first exhaust superheat is greater than TPsh2, proceed to step S911.

[0097] Step S907: Control the electronic expansion valve to reduce step B3 per cycle;

[0098] Step S908: Determine whether the auxiliary path heat TFsh is greater than or equal to TFsh1. If yes, proceed to step S909; otherwise, proceed to step S910.

[0099] Step S909: Control the electronic expansion valve to maintain the current opening.

[0100] Step S910: Control the electronic expansion valve to reduce step B1 per cycle;

[0101] Step S911: Determine whether the auxiliary path heat TFsh is greater than or equal to TFsh1 and less than or equal to TFsh2. If yes, proceed to step S913; if no, and the auxiliary path heat TFsh is less than TFsh1, proceed to step S912; if no, and the auxiliary path heat TFsh is greater than TFsh2, proceed to step S914.

[0102] Step S912: Control the electronic expansion valve to reduce step B1 per cycle;

[0103] Step S913: Control the electronic expansion valve to maintain the current opening.

[0104] Step S914: Determine whether the operating current is greater than or equal to L1%Climt and less than or equal to L2%Climt. If yes, proceed to step S916; if no and the operating current is less than L1%Climt, proceed to step S915; if no and the operating current is greater than L2%Climt, proceed to step S917.

[0105] Step S915: Control the electronic expansion valve to increase step B2 each cycle;

[0106] Step S916: Control the electronic expansion valve to increase B2*0.9 steps per cycle;

[0107] Step S917: Control the electronic expansion valve to maintain the current opening.

[0108] In this embodiment of the invention, the air conditioner is turned on and enters heating mode. Because when the outdoor ambient temperature is less than or equal to a certain temperature, the air conditioner's original heating circuit alone cannot meet the heating requirements, it is necessary to open the electronic expansion valve and use the economizer for gas replenishment to enhance the air conditioner's heating effect. Therefore, the outdoor ambient temperature is first determined to be less than or equal to T1. If so, the next step is performed; otherwise, the vapor injection enthalpy enhancement function is not activated, i.e., the electronic expansion valve is not opened. Furthermore, because when the operating frequency of the vapor injection enthalpy enhancement compressor is less than a certain frequency, opening the electronic expansion valve and using the economizer for gas replenishment may result in insufficient effective vapor injection enthalpy, which would actually reduce the air conditioner's heating effect. Therefore, after determining the outdoor ambient temperature and... When the preset conditions are met, the compressor's operating frequency is judged to determine if it is greater than or equal to Fr1. If so, the next judgment is made; otherwise, the vapor injection enthalpy enhancement function is not activated. Subsequently, when the second exhaust superheat of the vapor injection enthalpy enhancement compressor is less than a certain exhaust superheat, the electronic expansion valve is opened and gas replenishment is performed using the economizer. This can result in the refrigerant being unable to completely convert into gaseous refrigerant due to the low second exhaust superheat, causing liquid slugging damage to the vapor injection enthalpy enhancement compressor. Therefore, when both the outdoor ambient temperature and the operating frequency of the vapor injection enthalpy enhancement compressor meet the preset conditions, the compressor's second exhaust superheat is judged to determine if it is greater than or equal to T2. If so, the electronic expansion valve is controlled to open at its initial opening; otherwise, the vapor injection enthalpy enhancement function is not activated.

[0109] After the electronic expansion valve opens to its initial opening, the auxiliary circuit superheat and the first exhaust superheat are acquired. It is determined whether the first exhaust superheat is greater than or equal to TPsh1 and less than or equal to TPsh2. If yes, proceed to the next step. If no, and the first exhaust superheat is less than TPsh1, the electronic expansion valve is decremented by B3 steps per cycle. If no, and the first exhaust superheat is greater than TPsh2, proceed to the next step. If the first exhaust superheat is greater than or equal to TPsh1 and less than or equal to TPsh2, the next step is to determine whether the auxiliary circuit superheat is greater than or equal to TFsh1. If yes, the electronic expansion valve maintains its current opening; otherwise, the electronic expansion valve is decremented by B1 steps per cycle. If the first exhaust superheat is greater than TPsh2, the next step is to determine whether the auxiliary circuit superheat is greater than or equal to TFsh1 and less than or equal to TFsh2. If yes, the electronic expansion valve is controlled to maintain its current opening. If no, and the auxiliary circuit superheat is less than TFsh1, the electronic expansion valve is controlled to decrease by B1 steps per cycle. If no, and the auxiliary circuit superheat is greater than TFsh2, the next step is to determine whether the operating current is greater than or equal to L1%Climt and less than or equal to L2%Climt. If yes, the electronic expansion valve is controlled to increase by B2*0.9 steps per cycle. If no, and the operating current is less than L1%Climt, the electronic expansion valve is controlled to increase by B2 steps per cycle. If no, and the operating current is greater than L2%Climt, the electronic expansion valve is controlled to maintain its current opening.

[0110] Additionally, it should be noted that T1 in this embodiment is the preset temperature threshold in the above embodiment; Fr1 in this embodiment is the preset frequency threshold in the above embodiment; T2 in this embodiment is the preset superheat threshold in the above embodiment; TPsh1 in this embodiment is the first preset lower limit value in the above embodiment; TPsh2 in this embodiment is the second preset upper limit value in the above embodiment; TFsh1 in this embodiment is the second preset lower limit value in the above embodiment; TFsh2 in this embodiment is the second preset upper limit value in the above embodiment; B1 step in this embodiment is the first step opening degree in the above embodiment; B2 step in this embodiment is the second step opening degree in the above embodiment; B3 step in this embodiment is the third step opening degree in the above embodiment; Climt in this embodiment is the unit frequency limiting current of the air conditioner; L1 is the first proportional coefficient used to determine the lower limit current value in the above embodiment; L2 is the second proportional coefficient used to determine the upper limit current value in the above embodiment; the second proportional coefficient is greater than the first proportional coefficient; and 0.9 is the specific value of the third coefficient used to determine the fourth step opening degree in the above embodiment.

[0111] like Figure 10 As shown, Figure 10This is a schematic diagram of a controller for executing an air conditioner control method according to another embodiment of the present invention. Some embodiments of the present invention provide a controller, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the air conditioner control method of any of the above embodiments, such as executing the methods described above. Figure 2 Method steps S210 to S220, Figure 3 Method steps S310 to S330, Figure 4 Method steps S410 to S420 Figure 5 Method steps S510 to S530 Figure 6 Method steps S610 to S630, Figure 7 Method steps S710 to S720 Figure 8 Method steps S810 to S820 Figure 9 The method steps S901 to S917.

[0112] The controller 1000 of this embodiment includes one or more processors 1010 and a memory 1020. Figure 10 The example uses a processor 1010 and a memory 1020.

[0113] The processor 1010 and the memory 1020 can be connected via a bus or other means. Figure 10 Taking the example of a connection between China and Israel via a bus.

[0114] Memory 1020, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. Furthermore, memory 1020 may include high-speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, memory 1020 may optionally include memory 1020 remotely located relative to processor 1010, and these remote memories can be connected to controller 1000 via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0115] In some embodiments, when the processor executes a computer program, it executes the control method of the air conditioner according to any of the above embodiments at preset intervals.

[0116] Those skilled in the art will understand that Figure 10 The device structure shown does not constitute a limitation on the controller 1000 and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0117] exist Figure 10 In the controller 1000 shown, the processor 1010 can be used to call the control program of the air conditioner stored in the memory 1020, thereby realizing the control method of the air conditioner.

[0118] Based on the hardware structure of the controller 1000 described above, various embodiments of the air conditioner of the present invention are proposed.

[0119] Specifically, the air conditioner in this embodiment of the invention includes, but is not limited to, an indoor unit, an outdoor unit, and a controller. The indoor unit includes an indoor heat exchange module and an indoor fan. The outdoor unit includes a compressor, a gas-liquid separator, a refrigerant pipeline switching module, an outdoor heat exchanger, a temperature sensor for detecting the outdoor heat exchanger, an outdoor fan, and a throttling valve. The controller may include, for example, […]. Figure 10 The processor 1010 and memory 1020 are shown.

[0120] It should be noted that the indoor heat exchanger can be an evaporator or other equipment with heat exchange capabilities; this embodiment does not specifically limit it. It is understood that in heating mode, the indoor heat exchanger acts as the condenser, dissipating heat from the refrigerant.

[0121] The outdoor heat exchanger can be an evaporator or other equipment with heat exchange capabilities; this embodiment does not specifically limit it. It is understood that in heating mode, the outdoor heat exchanger acts as the evaporator, absorbing heat from the refrigerant.

[0122] It should be noted that the refrigerant pipeline switching module can be a four-way valve or a five-way valve, depending on the different settings of the refrigerant pipeline. This embodiment does not make a specific limitation on it.

[0123] The non-transient software program and instructions required to implement the air conditioner control method of the above embodiments are stored in the memory. When executed by the processor, the air conditioner control method of the above embodiments is executed.

[0124] Furthermore, embodiments of the present invention also provide an air conditioner, which includes the controller described above.

[0125] It is worth noting that, since the air conditioner of this embodiment has the controller of the above embodiment, and the controller of the above embodiment can execute the control method of the air conditioner of the above embodiment, the specific implementation method and technical effect of the air conditioner of this embodiment can refer to the specific implementation method and technical effect of the control method of the air conditioner of any of the above embodiments.

[0126] This invention also provides a computer-readable storage medium storing computer-executable instructions for executing the aforementioned air conditioner control method. These instructions cause one or more processors to execute the air conditioner control method described in the above-described method embodiments, such as executing the methods described above. Figure 2 Method steps S210 to S220, Figure 3 Method steps S310 to S330, Figure 4 Method steps S410 to S420 Figure 5 Method steps S510 to S530 Figure 6 Method steps S610 to S630, Figure 7 Method steps S710 to S720 Figure 8 Method steps S810 to S820 Figure 9 The method steps S901 to S917.

[0127] In summary, according to the technical solution of the embodiments of the present invention, the embodiments of the present invention can control the electronic expansion valve to open at an initial opening degree, and obtain and adjust the opening degree of the electronic expansion valve according to the auxiliary circuit superheat of the economizer, the first exhaust superheat of the compressor and the operating current value of the air conditioner. In this application, the injection enthalpy flow rate can be controlled more accurately and effectively, improving the injection enthalpy effect and thus improving the heating effect, and preventing problems such as liquid return and unit operating frequency fluctuation during the gas replenishment process, thereby ensuring the reliability of the compressor and effectively increasing the service life of the air conditioner.

[0128] It is worth noting that the specific implementation methods and technical effects of the computer-readable storage medium in the embodiments of the present invention can be referred to the specific implementation methods and technical effects of the air conditioner control method in any of the above embodiments. Furthermore, the device embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separated; that is, they may be located in one place or distributed across multiple network nodes. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0129] It will be understood by those skilled in the art that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include computer storage media (or non-transitory media) and communication media (or transient media). As is known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, as is known to those skilled in the art, communication media typically include computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0130] The above provides a detailed description of the preferred embodiments of the present invention. However, the present invention is not limited to the above embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of the present invention.

Claims

1. A control method for an air conditioner, characterized in that, The air conditioner includes a compressor, an electronic expansion valve, a condenser, an evaporator, and an economizer. The economizer has a main refrigerant circuit and an auxiliary refrigerant circuit. One end of the main refrigerant circuit is connected to the condenser, and the other end is connected to the inlet of the auxiliary refrigerant circuit and the evaporator, respectively. The outlet of the auxiliary refrigerant circuit is connected to the compressor's gas supply port. The electronic expansion valve is installed at the inlet of the auxiliary refrigerant circuit. The method includes: The electronic expansion valve is controlled to open at an initial opening degree, and the auxiliary circuit superheat of the economizer, the first discharge superheat of the compressor, and the operating current value of the air conditioner are obtained. The opening of the electronic expansion valve is adjusted according to the auxiliary circuit superheat, the first exhaust superheat, and the operating current value. Wherein, the auxiliary circuit superheat is the difference between the temperature at the outlet of the refrigerant auxiliary circuit and the temperature at the inlet of the refrigerant auxiliary circuit, and the first exhaust superheat is the difference between the exhaust temperature and the saturation temperature of the compressor. The step of adjusting the opening of the electronic expansion valve according to the auxiliary circuit superheat, the first exhaust superheat, and the operating current value includes: when the first exhaust superheat is greater than a first preset upper limit value, adjusting the opening of the electronic expansion valve according to the auxiliary circuit superheat and the operating current value. In addition, adjusting the opening of the electronic expansion valve according to the auxiliary circuit superheat and the operating current value includes: The lower limit current value is determined based on the unit frequency limiting current of the air conditioner and the first proportional coefficient, and the upper limit current value is determined based on the unit frequency limiting current and the second proportional coefficient; the fourth step opening degree is determined based on the preset third step opening degree and the third coefficient; wherein, the second proportional coefficient is greater than the first proportional coefficient, and the third coefficient is greater than zero and less than one; When the overheat of the auxiliary circuit is greater than the second preset upper limit value, if the operating current value is less than the lower limit current value, the electronic expansion valve is controlled to increase the current opening by the third step opening degree; if the operating current value is greater than or equal to the lower limit current value and less than or equal to the upper limit current value, the electronic expansion valve is controlled to increase the current opening by the fourth step opening degree, wherein the fourth step opening degree is less than the third step opening degree; if the operating current value is greater than the upper limit current value, the electronic expansion valve is controlled to maintain the current opening degree.

2. The control method for an air conditioner according to claim 1, characterized in that, The step of adjusting the opening of the electronic expansion valve based on the auxiliary circuit superheat, the first exhaust superheat, and the operating current value includes: When the first exhaust superheat is less than the first preset lower limit, the electronic expansion valve is controlled to reduce the current opening by a preset first step opening. When the first exhaust superheat is greater than or equal to the first preset lower limit and less than or equal to the first preset upper limit, the opening of the electronic expansion valve is adjusted according to the auxiliary road superheat.

3. The control method for an air conditioner according to claim 2, characterized in that, The step of adjusting the opening of the electronic expansion valve according to the auxiliary circuit superheat includes: When the overheat of the auxiliary circuit is less than the second preset lower limit, the electronic expansion valve is controlled to reduce the current opening by a preset second step opening. Alternatively, if the overheat of the auxiliary circuit is greater than or equal to the second preset lower limit, the electronic expansion valve is controlled to maintain its current opening.

4. The control method for an air conditioner according to claim 1, characterized in that, Adjusting the opening of the electronic expansion valve based on the auxiliary circuit superheat and the operating current value includes: When the overheat of the auxiliary circuit is less than the second preset lower limit, the electronic expansion valve is controlled to reduce the current opening by a preset second step opening. When the overheat of the auxiliary road is greater than or equal to the second preset lower limit and less than or equal to the second preset upper limit, the electronic expansion valve is controlled to maintain the current opening.

5. The control method for an air conditioner according to claim 1, characterized in that, The control of the electronic expansion valve to open at an initial opening includes: When the air conditioner is detected to meet the preset start-up conditions, the electronic expansion valve is controlled to open at the initial opening degree. The activation conditions include at least one of the following: The ambient temperature is less than or equal to the preset temperature threshold. The operating frequency of the compressor is greater than or equal to a preset frequency threshold; The second exhaust superheat of the compressor is greater than or equal to a preset superheat threshold.

6. The control method for an air conditioner according to claim 1, characterized in that, Before controlling the electronic expansion valve to open at its initial opening, the method further includes: Obtain the second exhaust superheat of the compressor; The initial opening degree is determined based on the second exhaust superheat of the compressor.

7. The control method for an air conditioner according to claim 4, characterized in that, The method further includes: Obtain the ambient temperature; The second preset upper limit value and the second preset lower limit value are determined based on the ambient temperature.

8. The control method for an air conditioner according to claim 1, characterized in that, The air conditioner also includes an enthalpy injection solenoid valve, which is installed at the outlet of the refrigerant auxiliary circuit. Before controlling the electronic expansion valve to open at its initial opening, the system further includes: The solenoid valve for controlling the injection enthalpy is opened.

9. The control method for an air conditioner according to claim 8, characterized in that, After adjusting the opening of the electronic expansion valve based on the auxiliary circuit superheat, the first exhaust superheat, and the operating current value, the method further includes: When the air conditioner is detected to meet the preset shutdown conditions, the electronic expansion valve and the enthalpy injection solenoid valve are controlled to close. The closing condition includes at least one of the following: The ambient temperature is greater than the preset temperature threshold. A first instruction is obtained to control the air conditioner to shut down. A second instruction for controlling the air conditioner to perform mode switching is obtained; Obtain a first signal indicating that the air conditioner is in the defrosting state; A second signal indicating that the air conditioner is in the unit oil return state is obtained.

10. A controller, characterized in that, include: The device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, implements the control method for an air conditioner as described in any one of claims 1 to 9.

11. An air conditioner, characterized in that, Includes the controller as described in claim 10.

12. A computer-readable storage medium, characterized in that, The device stores computer-executable instructions for performing the control method of the air conditioner as described in any one of claims 1 to 9.

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