Electronic expansion valve control method, device, air conditioner and storage medium

Abstract

The present invention relates to the technical field of air conditioners, and discloses an electronic expansion valve control method, device, air conditioner and storage medium. In the present invention, when the first current exhaust temperature of the outdoor unit is less than the preset target temperature, a first temperature difference is determined according to the first current exhaust temperature and the first historical exhaust temperature detected last time. When the first temperature difference is less than the first preset temperature, the opening degree to be adjusted is determined according to the first current exhaust temperature, and the opening degree of the electronic expansion valve is adjusted. Aiming at the problems that liquid carry-over in the gas injection and enthalpy increase system will damage the compressor and the heating effect will be severely attenuated, this solution detects the exhaust temperature to determine a suitable opening degree to control the operation of the electronic expansion valve, which can avoid the risk of liquid carry-over in the compressor gas injection operation, improve the heating stability, and enhance the reliability of the gas injection and enthalpy increase system.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and in particular to an electronic expansion valve control method, device, air conditioner and storage medium. Background Art

[0002] When a common air-conditioning system operates in heating mode, the opening of the electronic expansion valve is usually controlled according to the indoor and outdoor ambient temperatures, or the electronic expansion valve is controlled to operate at a fixed opening. However, the jet enthalpy increase system has an additional gas injection circuit. When operating according to the original control method, it is very easy to cause liquid carryover in the gas injection, and at this time, the system exhaust temperature is relatively low and difficult to recover, resulting in liquid compression of the compressor and affecting the system reliability.

[0003] The above content is only used to assist in understanding the technical solution of the present invention, and does not represent an admission that the above content is prior art. Summary of the Invention

[0004] The main object of the present invention is to provide an electronic expansion valve control method, device, air conditioner and storage medium, aiming to solve the technical problem that liquid carryover in the gas injection of the jet enthalpy increase system in the prior art may damage the compressor.

[0005] To achieve the above object, the present invention provides an electronic expansion valve control method, which includes the following steps:

[0006] Obtain the first current exhaust temperature of the outdoor unit and the first historical exhaust temperature detected last time;

[0007] When the first current exhaust temperature is less than a preset target temperature, determine a first temperature difference according to the first current exhaust temperature and the first historical exhaust temperature;

[0008] When the first temperature difference is less than a first preset temperature, determine the opening to be adjusted according to the first current exhaust temperature;

[0009] Adjust the opening of the electronic expansion valve according to the opening to be adjusted.

[0010] Optionally, before obtaining the first current exhaust temperature of the outdoor unit and the first historical exhaust temperature detected last time, it further includes:

[0011] When the air conditioner is in heating mode, control the electronic expansion valve to operate at an initial opening;

[0012] Reduce the opening of the electronic expansion valve according to a first preset time and a first preset opening;

[0013] Correspondingly, after obtaining the first current exhaust temperature of the outdoor unit and the first historical exhaust temperature detected last time, it further includes:

[0014] When the first temperature difference is greater than or equal to the first preset temperature, return to execute the step of reducing the opening degree of the electronic expansion valve according to the first preset time and the first preset opening degree.

[0015] Optionally, after obtaining the first current exhaust temperature of the outdoor unit and the first historical exhaust temperature detected last time, it further includes:

[0016] When the first current exhaust temperature is greater than or equal to the preset target temperature, obtain the current opening degree corresponding to the electronic expansion valve;

[0017] Control the electronic expansion valve to operate at the current opening degree.

[0018] Optionally, the determining the opening degree to be adjusted according to the first current exhaust temperature includes:

[0019] Search for the opening degree to be processed corresponding to the first current exhaust temperature;

[0020] Determine the opening degree to be adjusted according to the opening degree to be processed and the third preset opening degree;

[0021] Correspondingly, the adjusting the opening degree of the electronic expansion valve according to the opening degree to be adjusted includes:

[0022] Adjust the opening degree of the electronic expansion valve to the opening degree to be adjusted, and control the electronic expansion valve to operate at the opening degree to be adjusted for a second preset time.

[0023] Optionally, after searching for the opening degree to be processed corresponding to the first current exhaust temperature, it further includes:

[0024] Determine the target opening degree according to the opening degree to be processed and the second preset opening degree;

[0025] Correspondingly, after controlling the electronic expansion valve to operate at the opening degree to be adjusted for a second preset time, it further includes:

[0026] Obtain the second current exhaust temperature of the outdoor unit;

[0027] Determine the second temperature difference according to the second current exhaust temperature and the first current exhaust temperature;

[0028] When the second temperature difference is greater than or equal to the second preset temperature and the second current exhaust temperature is greater than or equal to the third preset temperature, reduce the opening degree of the electronic expansion valve according to the third preset time and the second preset opening degree until the electronic expansion valve operates at the target opening degree.

[0029] Optionally, after determining the second temperature difference according to the second current exhaust temperature and the first current exhaust temperature, it further includes:

[0030] When the second temperature difference is less than the second preset temperature, return to execute the step of determining the opening to be adjusted according to the opening to be processed and the third preset opening.

[0031] Optionally, after reducing the opening of the electronic expansion valve according to the third preset time and the second preset opening until the electronic expansion valve operates at the target opening, the method further includes:

[0032] Obtain the third current exhaust temperature of the outdoor unit and the second historical exhaust temperature detected last time;

[0033] Determine a third temperature difference according to the third current exhaust temperature and the second historical exhaust temperature;

[0034] When the third temperature difference is greater than or equal to the first preset temperature, control the electronic expansion valve to operate at the target opening.

[0035] In addition, to achieve the above object, the present invention further provides an electronic expansion valve control device, which includes:

[0036] A temperature acquisition module, configured to acquire the first current exhaust temperature of the outdoor unit and the first historical exhaust temperature detected last time;

[0037] A difference determination module, configured to determine a first temperature difference according to the first current exhaust temperature and the first historical exhaust temperature when the first current exhaust temperature is less than the preset target temperature;

[0038] An opening determination module, configured to determine the opening to be adjusted according to the first current exhaust temperature when the first temperature difference is less than the first preset temperature;

[0039] An opening calculation module, configured to adjust the opening of the electronic expansion valve according to the opening to be adjusted.

[0040] In addition, to achieve the above object, the present invention further provides an air conditioner, which includes: a memory, a processor, and an electronic expansion valve control program stored on the memory and executable on the processor. When the electronic expansion valve control program is executed by the processor, the electronic expansion valve control method as described above is implemented.

[0041] In addition, to achieve the above object, the present invention further provides a storage medium, on which an electronic expansion valve control program is stored. When the electronic expansion valve control program is executed by the processor, the electronic expansion valve control method as described above is implemented.

[0042] In the electronic expansion valve control method proposed by the present invention, when the first current exhaust temperature of the outdoor unit is lower than the preset target temperature, the first temperature difference is determined based on the first current exhaust temperature and the first historical exhaust temperature detected last time. When the first temperature difference is less than the first preset temperature, the opening degree to be adjusted is determined according to the first current exhaust temperature, and the opening degree of the electronic expansion valve is adjusted. Aiming at the problem that liquid carry - over in the gas injection and enthalpy - increase system will damage the compressor and seriously attenuate the heating effect, this solution detects the exhaust temperature to determine the appropriate opening degree to control the operation of the electronic expansion valve, which can avoid the risk of liquid carry - over during compressor gas injection, improve the heating stability, and enhance the reliability of the gas injection and enthalpy - increase system. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 FIG. is a schematic diagram of the air conditioner structure of the hardware operating environment involved in the embodiment solution of the present invention;

[0044] Figure 2 FIG. is a schematic flow chart of the first embodiment of the electronic expansion valve control method of the present invention;

[0045] Figure 3 FIG. is a schematic diagram of the gas injection and enthalpy - increase system of an embodiment of the electronic expansion valve control method of the present invention;

[0046] Figure 4 FIG. is a schematic flow chart of the second embodiment of the electronic expansion valve control method of the present invention;

[0047] Figure 5 FIG. is a schematic flow chart of the third embodiment of the electronic expansion valve control method of the present invention;

[0048] Figure 6 FIG. is a schematic diagram of the logic control of an embodiment of the electronic expansion valve control method of the present invention;

[0049] Figure 7 FIG. is a schematic diagram of the functional modules of the first embodiment of the electronic expansion valve control device of the present invention.

[0050] Explanation of the reference numerals in the drawings:

[0051] Label Name Label Name 100 Compressor 200 Four-way valve 300 Condenser 400 Outdoor fan 500 Electronic expansion valve 600 Flash evaporator 700 Throttle valve 800 Capillary tube 900 Evaporator 1000 Indoor fan

[0052] The realization, functional features, and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0053] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0054] Refer to Figure 1 , Figure 1 FIG. is a schematic diagram of the air conditioner structure of the hardware operating environment involved in the embodiment solution of the present invention.

[0055] As shown in Figure 1 , the air conditioner may include: a processor 1001, such as a Central Processing Unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Among them, the communication bus 1002 is used to implement the connection and communication between these components. The user interface 1003 may include a display screen (Display) and an input unit such as buttons. Optionally, the user interface 1003 may further include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a Wi-Fi interface). The memory 1005 may be a high-speed random access memory (Random Access Memory, RAM), or a stable memory (non-volatile memory), such as a disk memory. Optionally, the memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0056] Those skilled in the art can understand that Figure 1 the device structure shown in

[0057] As shown in Figure 1 , the memory 1005, as a storage medium, may include an operating system, a network communication module, a user interface module, and an electronic expansion valve control program.

[0058] In Figure 1 the air conditioner shown, the network interface 1004 is mainly used to connect to the external network and perform data communication with other network devices; the user interface 1003 is mainly used to connect to user devices and perform data communication with the user devices; the device of the present invention calls the electronic expansion valve control program stored in the memory 1005 through the processor 1001 and executes the electronic expansion valve control method provided by the embodiments of the present invention.

[0059] Based on the above hardware structure, an embodiment of the electronic expansion valve control method of the present invention is proposed.

[0060] Referring to Figure 2 , Figure 2 is a schematic flowchart of the first embodiment of the electronic expansion valve control method of the present invention.

[0061] In the first embodiment, the electronic expansion valve control method includes the following steps:

[0062] Step S10, obtain the first current exhaust temperature of the outdoor unit and the first historical exhaust temperature detected last time.

[0063] It should be noted that the execution subject of this embodiment can be an air conditioner equipped with a jet enthalpy increase system, such as a floor-standing air conditioner, a wall-mounted air conditioner, and a central air conditioner equipped with a jet enthalpy increase system, or other jet enthalpy increase air conditioners that can achieve the same or similar functions. This embodiment does not limit this. Among them, the jet enthalpy increase system is a new system composed of a jet enthalpy increase compressor, jet enthalpy increase technology, and an efficient cooler. The combination of these three technologies can provide efficient performance. This is an organic whole, that is, an economizer formed by an efficient jet enthalpy increase compressor, an efficient subcooler, and an electronic expansion valve, and an efficient heat exchanger together constitute an energy-efficient jet system.

[0064] It should be noted that this solution aims at the problem that in the prior art, when the jet enthalpy increase system operates in the heating mode and operates according to the original control method, it is very easy to cause liquid carry-over in the gas supplement, and at this time, the system exhaust temperature is low and difficult to recover, leading to liquid compression of the compressor and affecting the reliability of the system. Therefore, this solution aims at the heating mode of the air conditioner.

[0065] It should be understood that as Figure 3 shown, Figure 3 is a schematic diagram of the jet enthalpy increase system, Figure 3 and the arrows in it represent the heating operation direction of the refrigerant in the heating mode. Figure 3 The air conditioner in it includes an outdoor unit and an indoor unit. Among them, the outdoor unit includes: a compressor 100, a four-way valve 200, a condenser 300, an outdoor fan 400, an electronic expansion valve 500, a flash evaporator 600, a throttle valve 700, and a capillary tube 800. The indoor unit includes: an evaporator 900 and an indoor fan 1000. Figure 3 The meanings of each letter in it are as follows: a: exhaust, b: cold middle, c: cold out, d: after the electronic expansion valve, e: before the throttle valve, f: after the throttle valve, g: after the capillary tube, h: steam in, i: steam out, j: gas supplement, k: return air. The jet enthalpy increase compressor adopts a two-stage throttling and intermediate jetting technology, and uses a flash evaporator for gas-liquid separation to achieve the enthalpy increase effect. It cools by jetting while compressing at medium and low pressures, and then compresses normally at high pressures, increasing the compressor exhaust volume and achieving the purpose of improving the heating capacity in a low-temperature environment.

[0066] It should be understood that the exhaust temperature of the outdoor unit can be detected in real time or periodically. Therefore, after detecting the current exhaust temperature, the exhaust detected last time can be called the historical exhaust temperature. The "first" and "second" in this embodiment are only used to distinguish the exhaust temperatures at different time points and do not have other limitations. The exhaust temperature of the outdoor unit can be detected once per minute, once per second, or other intervals can be set to detect the exhaust temperature of the outdoor unit. This embodiment does not limit this.

[0067] In a specific implementation, for example, assume that the exhaust temperature of the outdoor unit is detected once per minute, that is, the exhaust temperature can be detected 5 times within five minutes, which are M1, M2, M3, M4, and M5 respectively. If the current exhaust temperature is M5, then the historical exhaust temperature detected last time is M4.

[0068] Further, before the step S10, it further includes:

[0069] When the air conditioner is in the heating mode, control the electronic expansion valve to operate at the initial opening; reduce the opening of the electronic expansion valve according to the first preset time and the first preset opening.

[0070] It should be noted that the first preset time can be preset as TM0 in advance, and the first preset opening can be preset as △PMV0 in advance. The specific values of the first preset time and the first preset opening can be set according to the actual situation, and this embodiment does not limit this.

[0071] It should be understood that when the air conditioner is in heating operation, the exhaust temperature TP of the outdoor unit can be detected in real time, and at the same time, the electronic expansion valve is controlled to gradually decrease from the initial opening PMV0 according to the first preset time TM0 and the first preset opening △PMV0. For example, assume that the first preset time TM0 is 10S. Then when the air conditioner just enters the heating mode operation, the electronic expansion valve of the air conditioner can be controlled to be adjusted to the initial opening PMV0, and then the opening of the electronic expansion valve is reduced by the first preset opening △PMV0 every 10S.

[0072] It should be noted that the preset target temperature TP can be preset in advance 目标 , and the specific value of the preset target temperature can be set according to the actual situation, and this embodiment does not limit this.

[0073] It should be understood that during the process of reducing the opening of the electronic expansion valve, if the first current exhaust temperature reaches the preset target temperature TP 目标 , that is, the first current exhaust temperature is greater than or equal to the preset target temperature TP 目标 , then the current opening corresponding to the electronic expansion valve can be obtained, and the electronic expansion valve is controlled to keep the current opening unchanged and continue to operate at the current opening.

[0074] Step S20, when the first current exhaust temperature is less than the preset target temperature, determine the first temperature difference according to the first current exhaust temperature and the first historical exhaust temperature.

[0075] It should be understood that during the process of reducing the opening of the electronic expansion valve, if the first current exhaust temperature has not reached the preset target temperature TP 目标 , that is, the first current exhaust temperature is less than the preset target temperature TP 目标, the first current exhaust temperature TP can be used as a basis n and the first historical exhaust temperature TP n-1 to calculate the first temperature difference △TP1. Specifically, it can be obtained by subtracting the first current exhaust temperature from the first historical exhaust temperature, that is, the first temperature difference △TP1 = the first historical exhaust temperature TP n-1 − the first current exhaust temperature TP n .

[0076] It should be noted that the first preset temperature T1 can be set in advance. The specific value of the first preset temperature can be set according to the actual situation, and this embodiment does not limit it.

[0077] It can be understood that after calculating the first temperature difference, the first temperature difference can be compared with the first preset temperature to determine whether the first temperature difference is greater than or equal to the first preset temperature. If the first temperature difference is greater than or equal to the first preset temperature, that is, △TP1≥T1, the action of reducing the opening of the electronic expansion valve is continuously executed, and the opening of the electronic expansion valve is continuously reduced according to the first preset time and the first preset opening.

[0078] Step S30, when the first temperature difference is less than the first preset temperature, determine the opening to be adjusted according to the first current exhaust temperature.

[0079] It can be understood that if the first temperature difference is less than the first preset temperature, that is, △TP1<T1, the corresponding opening to be processed PMV can be determined according to the first current exhaust temperature TP n and then calculate the opening to be adjusted PMV according to the opening to be processed. n

[0080] Step S40, adjust the opening of the electronic expansion valve according to the opening to be adjusted.

[0081] It should be understood that after calculating the opening to be adjusted PMV, the opening of the electronic expansion valve can be adjusted according to the opening to be adjusted PMV, and the opening of the electronic expansion valve is adjusted to the opening to be adjusted PMV for operation. Thus, by detecting the exhaust temperature, the appropriate opening is determined by the exhaust temperature to adjust the electronic expansion valve, so that the electronic expansion valve operates at an appropriate opening.

[0082] In this embodiment, when the first current exhaust temperature of the outdoor unit is less than the preset target temperature, a first temperature difference is determined based on the first current exhaust temperature and the first historical exhaust temperature detected last time. When the first temperature difference is less than the first preset temperature, the opening to be adjusted is determined according to the first current exhaust temperature, and the opening of the electronic expansion valve is adjusted. Aiming at the problem that liquid carry - over in the gas injection and enthalpy - increase system will damage the compressor and seriously attenuate the heating effect, this solution detects the exhaust temperature to determine the appropriate opening to control the operation of the electronic expansion valve, which can avoid the risk of liquid carry - over in the compressor during gas injection, improve the heating stability, and enhance the reliability of the gas injection and enthalpy - increase system.

[0083] In one embodiment, as Figure 4 shown, based on the first embodiment, the second embodiment of the electronic expansion valve control method of the present invention is proposed. The step S30 includes:

[0084] Step S301, when the first temperature difference is less than the first preset temperature, find the opening to be processed corresponding to the first current exhaust temperature.

[0085] It should be understood that since there is a corresponding relationship between the exhaust temperature and the opening of the electronic expansion valve, the openings of the electronic expansion valve corresponding to different exhaust temperatures can be preset in advance to form a temperature - opening correspondence table. When △TP1 < T1, the opening to be processed PMV corresponding to the first current exhaust temperature TP n can be determined according to the temperature - opening correspondence table. n .

[0086] Step S302, determine the opening to be adjusted according to the opening to be processed and the third preset opening.

[0087] It should be noted that the third preset opening △PMV2 can be preset in advance, and the specific value of the third preset opening can be set according to the actual situation, and this embodiment does not limit this.

[0088] It should be understood that the opening to be adjusted can be calculated according to the opening to be processed and the third preset opening through the following formula:

[0089] PMV = PMV n + △PMV2 * N2;

[0090] where PMV is the opening to be adjusted, PMV n is the opening to be processed, △PMV2 is the third preset opening, and N2 is the current cycle number (N2 = 1, 2, 3, 4......). For example, when it is the first cycle currently, N2 = 1, and when it is the second cycle currently, N2 = 2, etc.

[0091] Correspondingly, the step S40 includes:

[0092] Step S401: Adjust the opening degree of the electronic expansion valve to the opening degree to be adjusted, and control the electronic expansion valve to maintain the opening degree to be adjusted for operation for a second preset time.

[0093] It should be noted that the second preset time TM1 can be set in advance, and the specific value of the second preset time can be set according to the actual situation, and this embodiment does not limit this.

[0094] It should be understood that after calculating the opening degree to be adjusted, the opening degree of the electronic expansion valve can be adjusted according to the opening degree to be adjusted, and the electronic expansion valve can continue to operate at the opening degree to be adjusted for TM1.

[0095] In this embodiment, first, the opening degree to be processed corresponding to the first current exhaust temperature is found according to the correspondence between temperature and opening degree, and then the opening degree to be adjusted is calculated according to the found opening degree to be processed and the third preset opening degree, so that the electronic expansion valve continues to operate at the opening degree to be adjusted for the second preset time, so that the opening degree to be adjusted can be accurately calculated, so as to achieve a better control effect of the electronic expansion valve and avoid the compressor from operating with liquid in the supplementary air.

[0096] In one embodiment, as Figure 5 shown, based on the second embodiment, the third embodiment of the electronic expansion valve control method of the present invention is proposed. In this embodiment, after the step S301, the following is further included:

[0097] Step S001: Determine the target opening degree according to the opening degree to be processed and the second preset opening degree.

[0098] It should be noted that the second preset opening degree △PMV1 can be set in advance, and the specific value of the second preset opening degree can be set according to the actual situation, and this embodiment does not limit this.

[0099] It should be understood that the target opening degree can be calculated according to the opening degree to be processed and the second preset opening degree through the following formula:

[0100] PMV 目标 = PMV n + △PMV1 * N1;

[0101] where PMV 目标 is the target opening degree, PMV n is the opening degree to be processed, △PMV1 is the second preset opening degree, and N1 is the current cycle number (N2 = 1, 2, 3, 4......). For example, when the current is the first cycle, N1 = 1, and when the current is the second cycle, N1 = 2, etc.

[0102] Correspondingly, after the step S401, the following is further included:

[0103] Step S501, obtain the second current exhaust temperature of the outdoor unit.

[0104] It should be understood that after the electronic expansion valve operates at the opening to be adjusted for a duration of TM1, the second current exhaust temperature TP corresponding to the outdoor unit can be obtained. n+1 .

[0105] Step S502, determine a second temperature difference based on the second current exhaust temperature and the first current exhaust temperature.

[0106] It should be understood that the second temperature difference ΔTP2 between the second current exhaust temperature and the first current exhaust temperature can be calculated, where ΔTP2 = TP n+1 −TP n .

[0107] Step S503, when the second temperature difference is greater than or equal to a second preset temperature and the second current exhaust temperature is greater than or equal to a third preset temperature, reduce the opening of the electronic expansion valve according to a third preset time and a second preset opening until the electronic expansion valve operates at the target opening.

[0108] It should be noted that a second preset temperature T2 and a third preset temperature T3 can be set in advance. The specific values of the second preset temperature and the third preset temperature can be set according to the actual situation, and this embodiment does not limit this.

[0109] It should be understood that after calculating the second temperature difference ΔTP2, the second temperature difference ΔTP2 can be compared with the second preset temperature T2. If the second temperature difference ΔTP2 is less than the second preset temperature T2, then return to execute the step of determining the opening to be adjusted according to the opening to be processed and the third preset opening, increment N2 by 1, recalculate the opening to be adjusted, and perform subsequent loop operations.

[0110] It should be noted that the third preset time can be set in advance as TM2. The specific value of the third preset time can be set according to the actual situation, and this embodiment does not limit this.

[0111] It should be understood that if the second temperature difference ΔTP2 is greater than or equal to the second preset temperature T2, then further compare the second current exhaust temperature TP n+1 with the third preset temperature T3. If the second current exhaust temperature TP n+1 is greater than or equal to the third preset temperature T3, then the electronic expansion valve can be controlled to gradually decrease from the opening to be adjusted PMV according to the third preset time TM2 and the second preset opening ΔPMV1, that is, reduce the opening of the electronic expansion valve by ΔPMV1 every TM2 until the opening of the electronic expansion valve is reduced to the target opening PMV 目标 .

[0112] It should be understood that the third current exhaust temperature TP of the outdoor unit can be obtained n ' and the second historical exhaust temperature TP detected last time n-1 ', and then the third temperature difference △TP3 is calculated, where △TP 3＝ TP n ' - TP n-1 '.

[0113] It can be understood that the third temperature difference △TP3 can be compared with the first preset temperature T1. If the third temperature difference △TP3 is greater than or equal to the first preset temperature T1, the electronic expansion valve can be controlled to maintain operation at PMV 目标 . If the third temperature difference △TP3 is less than the first preset temperature T1, return to the step of determining the target opening according to the to-be-processed opening and the second preset opening, increment N1 by 1, recalculate the target opening, and perform subsequent loop operations.

[0114] In a specific implementation, as shown in Figure 6 shown Figure 6 is a schematic diagram of logic control. Through the logic control in Figure 6 , loop detection is performed, and the target opening can be accurately corrected, so that the electronic expansion valve finally operates at a suitable opening.

[0115] In this embodiment, the target opening is calculated according to the to-be-processed opening and the second preset opening, and the second temperature difference between the second current exhaust temperature and the first current exhaust temperature is determined. If the second temperature difference is greater than the second preset temperature and the second current exhaust temperature is greater than or equal to the third preset temperature, the opening of the electronic expansion valve is reduced by △PMV1 every TM2 until the opening of the electronic expansion valve is reduced to the target opening PMV 目标 , so that the opening of the electronic expansion valve can be adjusted according to the exhaust temperature, and the heating stability can be improved.

[0116] In addition, an embodiment of the present invention also provides a storage medium, on which an electronic expansion valve control program is stored. When the electronic expansion valve control program is executed by a processor, the steps of the electronic expansion valve control method described above are implemented.

[0117] Since this storage medium adopts all the technical solutions of the above-mentioned all embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and will not be elaborated here one by one.

[0118] In addition, referring to Figure 7 , an embodiment of the present invention also provides an electronic expansion valve control device, which includes:

[0119] The temperature acquisition module 10 is configured to acquire the first current exhaust temperature of the outdoor unit and the first historical exhaust temperature detected last time.

[0120] It should be noted that the air conditioner in this embodiment can be an air conditioner configured with a jet enthalpy boost system, such as a floor-standing air conditioner, a wall-mounted air conditioner, and a central air conditioner configured with a jet enthalpy boost system, or other jet enthalpy boost air conditioners that can achieve the same or similar functions. This embodiment does not limit this. Among them, the jet enthalpy boost system is a new system composed of a jet enthalpy boost compressor, jet enthalpy boost technology, and an efficient cooler. The combination of these three technologies can provide efficient performance. This is an organic whole, that is, an economizer formed by an efficient jet enthalpy boost compressor, an efficient subcooler, and an electronic expansion valve, and an efficient heat exchanger together constitute an energy-efficient jet system.

[0121] It should be noted that this solution aims at the problem in the prior art that when the jet enthalpy boost system operates in the heating mode and operates according to the original control method, it is extremely easy to cause liquid carryover in the gas supplement, and at this time, the system exhaust temperature is low and difficult to recover, resulting in liquid compression of the compressor and affecting the reliability of the system. Therefore, this solution targets the heating mode of the air conditioner.

[0122] It should be understood that as Figure 3 shown, Figure 3 is a schematic diagram of the jet enthalpy boost system, Figure 3 and the arrows in it represent the heating operation direction of the refrigerant in the heating mode. Figure 3 The air conditioner in it includes an outdoor unit and an indoor unit. Among them, the outdoor unit includes: a compressor 100, a four-way valve 200, a condenser 300, an outdoor fan 400, an electronic expansion valve 500, a flash evaporator 600, a throttle valve 700, and a capillary tube 800. The indoor unit includes: an evaporator 900 and an indoor fan 1000. Figure 3 The meanings of the letters in it are as follows: a: exhaust, b: cold middle, c: cold out, d: after the electronic expansion valve, e: before the throttle valve, f: after the throttle valve, g: after the capillary tube, h: steam in, i: steam out, j: gas supplement, k: return air. The jet enthalpy boost compressor adopts a two-stage throttling and intermediate jetting technology, and uses a flash evaporator for gas-liquid separation to achieve the enthalpy boost effect. It cools by jetting while compressing at medium and low pressures, and then compresses normally at high pressures, increasing the compressor exhaust volume and achieving the purpose of enhancing the heating capacity in a low-temperature environment.

[0123] It should be understood that the exhaust temperature of the outdoor unit can be detected in real time or periodically. Therefore, after detecting the current exhaust temperature, the exhaust temperature detected last time can be called the historical exhaust temperature. The "first" and "second" in this embodiment are only used to distinguish the exhaust temperatures at different time points and have no other limitations. The exhaust temperature of the outdoor unit can be detected once per minute, once per second, or other intervals can be set for detecting the exhaust temperature of the outdoor unit, and this embodiment does not limit this.

[0124] In a specific implementation, for example, assuming that the exhaust temperature of the outdoor unit is detected once per minute, that is, the exhaust temperature can be detected 5 times within five minutes, which are M1, M2, M3, M4, and M5 respectively. If the current exhaust temperature is M5, then the historical exhaust temperature detected last time is M4.

[0125] Furthermore, the electronic expansion valve control device further includes an initial control module, which is used to control the electronic expansion valve to operate at an initial opening when the air conditioner is in the heating mode; and reduce the opening of the electronic expansion valve according to a first preset time and a first preset opening.

[0126] It should be noted that the first preset time can be preset as TM0, and the first preset opening can be preset as △PMV0. The specific values of the first preset time and the first preset opening can be set according to the actual situation, and this embodiment does not limit this.

[0127] It should be understood that when the air conditioner is operating in heating, the exhaust temperature TP of the outdoor unit can be detected in real time, and at the same time, the electronic expansion valve is controlled to gradually decrease according to the first preset time TM0 and the first preset opening △PMV0 from the initial opening PMV0. For example, assuming that the first preset time TM0 is 10S, then when the air conditioner just enters the heating mode, the electronic expansion valve of the air conditioner can be controlled to be adjusted to the initial opening PMV0, and then the opening of the electronic expansion valve is reduced by the first preset opening △PMV0 every 10S.

[0128] It should be noted that a preset target temperature TP can be preset 目标 , and the specific value of the preset target temperature can be set according to the actual situation, and this embodiment does not limit this.

[0129] It should be understood that during the process of reducing the opening of the electronic expansion valve, if the first current exhaust temperature reaches the preset target temperature TP 目标 , that is, the first current exhaust temperature is greater than or equal to the preset target temperature TP 目标 , then the current opening corresponding to the electronic expansion valve can be obtained, and the electronic expansion valve is controlled to keep the current opening unchanged and continue to operate at the current opening.

[0130] The difference determination module 20 is configured to determine a first temperature difference according to the first current exhaust temperature and the first historical exhaust temperature when the first current exhaust temperature is less than a preset target temperature.

[0131] It should be understood that during the process of reducing the opening degree of the electronic expansion valve, if the first current exhaust temperature has not reached the preset target temperature TP 目标 , that is, the first current exhaust temperature is less than the preset target temperature TP 目标 , then the first temperature difference ΔTP1 can be calculated according to the first current exhaust temperature TP n and the first historical exhaust temperature TP n-1 . Specifically, the first temperature difference can be obtained by subtracting the first current exhaust temperature from the first historical exhaust temperature, that is, the first temperature difference ΔTP1 = the first historical exhaust temperature TP n-1 - the first current exhaust temperature TP n .

[0132] It should be noted that a first preset temperature T1 can be set in advance, and the specific value of the first preset temperature can be set according to actual conditions, and this embodiment does not limit this.

[0133] It can be understood that after calculating the first temperature difference, the first temperature difference can be compared with the first preset temperature to determine whether the first temperature difference is greater than or equal to the first preset temperature. If the first temperature difference is greater than or equal to the first preset temperature, that is, ΔTP1 ≥ T1, the action of reducing the opening degree of the electronic expansion valve is continuously executed, and the opening degree of the electronic expansion valve is continuously reduced according to the first preset time and the first preset opening degree.

[0134] The opening degree determination module 30 is configured to determine a to-be-adjusted opening degree according to the first current exhaust temperature when the first temperature difference is less than the first preset temperature.

[0135] It can be understood that if the first temperature difference is less than the first preset temperature, that is, ΔTP1 < T1, then the corresponding to-be-processed opening degree PMV can be determined according to the first current exhaust temperature TP n , and then the to-be-adjusted opening degree PMV is calculated according to the to-be-processed opening degree. n

[0136] The opening degree calculation module 40 is configured to adjust the opening degree of the electronic expansion valve according to the to-be-adjusted opening degree.

[0137] It should be understood that after calculating the PMV of the opening degree to be adjusted, the opening degree of the electronic expansion valve can be adjusted according to the PMV of the opening degree to be adjusted, and the opening degree of the electronic expansion valve is adjusted to operate at the PMV of the opening degree to be adjusted. Thus, by detecting the exhaust temperature, the appropriate opening degree is determined based on the exhaust temperature to adjust the electronic expansion valve, so that the electronic expansion valve operates at an appropriate opening degree.

[0138] In this embodiment, when the first current exhaust temperature of the outdoor unit is lower than the preset target temperature, the first temperature difference is determined according to the first current exhaust temperature and the first historical exhaust temperature detected last time. When the first temperature difference is less than the first preset temperature, the opening degree to be adjusted is determined according to the first current exhaust temperature, and the opening degree of the electronic expansion valve is adjusted. Aiming at the problem that liquid carry - over in the gas injection and enthalpy - increase system will damage the compressor and seriously attenuate the heating effect, this solution detects the exhaust temperature to determine the appropriate opening degree to control the operation of the electronic expansion valve, which can avoid the risk of liquid carry - over during compressor gas injection, improve the heating stability, and enhance the reliability of the gas injection and enthalpy - increase system. Moreover, by monitoring the system operation status in real - time through the exhaust temperature, the capacity and energy efficiency during system testing are guaranteed, and the passing rate of market sampling inspection is improved.

[0139] For other embodiments or specific implementation methods of the electronic expansion valve control device of the present invention, reference may be made to the above - mentioned method embodiments, which will not be elaborated here.

[0140] It should be noted that in this article, the term "including", "comprising" or any other variant thereof is intended to cover non - exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or device including that element.

[0141] The serial numbers of the above - mentioned embodiments of the present invention are only for description and do not represent the superiority or inferiority of the embodiments.

[0142] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-described example methods can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art can be embodied in the form of a software product. This computer software product is stored in a computer-readable storage medium as described above (such as ROM / RAM, magnetic disk, optical disk), and includes several instructions for causing an intelligent device (which can be a mobile phone, computer, air conditioner, or network air conditioner, etc.) to execute the methods described in various embodiments of the present invention.

[0143] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. An electronic expansion valve control method, characterized in that The electronic expansion valve control method includes the following steps: Obtain the first current exhaust temperature of the outdoor unit and the first historical exhaust temperature detected last time; When the first current exhaust temperature is less than the preset target temperature, determine a first temperature difference according to the first current exhaust temperature and the first historical exhaust temperature; When the first temperature difference is less than the first preset temperature, find the to-be-processed opening degree corresponding to the first current exhaust temperature; determine the to-be-adjusted opening degree according to the to-be-processed opening degree and the third preset opening degree; Adjust the opening degree of the electronic expansion valve to the to-be-adjusted opening degree, and control the electronic expansion valve to maintain the to-be-adjusted opening degree for operation for a second preset time; After finding the to-be-processed opening degree corresponding to the first current exhaust temperature, it further includes: Determine the target opening degree according to the to-be-processed opening degree and the second preset opening degree; Correspondingly, after controlling the electronic expansion valve to maintain the to-be-adjusted opening degree for operation for a second preset time, it further includes: Obtain the second current exhaust temperature of the outdoor unit; Determine a second temperature difference according to the second current exhaust temperature and the first current exhaust temperature; and When the second temperature difference is greater than or equal to the second preset temperature and the second current exhaust temperature is greater than or equal to the third preset temperature, reduce the opening degree of the electronic expansion valve according to the third preset time and the second preset opening degree until the electronic expansion valve operates at the target opening degree.

2. The electronic expansion valve control method according to claim 1, wherein, Before obtaining the first current exhaust temperature of the outdoor unit and the first historical exhaust temperature detected last time, it further includes: When the air conditioner is in the heating mode, control the electronic expansion valve to operate at the initial opening degree; Reduce the opening degree of the electronic expansion valve according to the first preset time and the first preset opening degree; and Correspondingly, after obtaining the first current exhaust temperature of the outdoor unit and the first historical exhaust temperature detected last time, it further includes: When the first temperature difference is greater than or equal to the first preset temperature, return to execute the step of reducing the opening degree of the electronic expansion valve according to the first preset time and the first preset opening degree.

3. The electronic expansion valve control method according to claim 2, characterized in that, After obtaining the first current exhaust temperature of the outdoor unit and the first historical exhaust temperature detected last time, it further includes: When the first current exhaust temperature is greater than or equal to the preset target temperature, obtain the current opening degree corresponding to the electronic expansion valve; and Control the electronic expansion valve to maintain the current opening degree for operation.

4. The electronic expansion valve control method according to claim 1, wherein After determining the second temperature difference according to the second current exhaust temperature and the first current exhaust temperature, it further includes: When the second temperature difference is less than the second preset temperature, return to execute the step of determining the to-be-adjusted opening degree according to the to-be-processed opening degree and the third preset opening degree.

5. The electronic expansion valve control method according to claim 1, characterized in that, After reducing the opening degree of the electronic expansion valve according to the third preset time and the second preset opening degree until the electronic expansion valve operates at the target opening degree, it further includes: Obtain the third current exhaust temperature of the outdoor unit and the second historical exhaust temperature detected last time; Determine a third temperature difference according to the third current exhaust temperature and the second historical exhaust temperature; and When the third temperature difference is greater than or equal to the first preset temperature, control the electronic expansion valve to maintain the target opening degree for operation.

6. An electronic expansion valve control device, characterized in that, The electronic expansion valve control device includes: a temperature acquisition module configured to acquire a first current exhaust temperature of an outdoor unit and a first historical exhaust temperature detected last time; a difference determination module configured to determine a first temperature difference according to the first current exhaust temperature and the first historical exhaust temperature when the first current exhaust temperature is less than a preset target temperature; an opening degree determination module configured to, when the first temperature difference is less than a first preset temperature, look up a to-be-processed opening degree corresponding to the first current exhaust temperature; and determine an opening degree to be adjusted according to the to-be-processed opening degree and a third preset opening degree; an opening degree calculation module configured to adjust the opening degree of the electronic expansion valve to the opening degree to be adjusted, and control the electronic expansion valve to maintain the opening degree to be adjusted for operation for a second preset time; determine a target opening degree according to the to-be-processed opening degree and a second preset opening degree; acquire a second current exhaust temperature of the outdoor unit; determine a second temperature difference according to the second current exhaust temperature and the first current exhaust temperature; and when the second temperature difference is greater than or equal to a second preset temperature and the second current exhaust temperature is greater than or equal to a third preset temperature, reduce the opening degree of the electronic expansion valve according to a third preset time and a second preset opening degree until the electronic expansion valve operates at the target opening degree.

7. An air conditioner, characterized in that, The air conditioner includes: a memory, a processor, and an electronic expansion valve control program stored on the memory and executable on the processor. When the electronic expansion valve control program is executed by the processor, the electronic expansion valve control method according to any one of claims 1 to 5 is implemented.

8. A storage medium, characterized in that, An electronic expansion valve control program is stored on the storage medium. When the electronic expansion valve control program is executed by the processor, the electronic expansion valve control method according to any one of claims 1 to 5 is implemented.

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