Operation control method for air conditioner and electronic expansion valve

Abstract

The present invention discloses an operating control method for an air conditioner and an electronic expansion valve. The air conditioner includes a variable-frequency compressor and an electronic expansion valve. After determining the theoretical optimal opening value of the electronic expansion valve, an optimal opening range of the electronic expansion valve is determined according to the theoretical optimal opening value. When the variable-frequency compressor enters the medium and low frequency operating mode, the operating opening of the electronic expansion valve is adjusted so that the operating opening of the electronic expansion valve reciprocally varies within the optimal opening range. By adopting the technical means of the embodiment of the present invention, for air conditioners produced in batches, by adjusting the opening of the electronic expansion valve to make it operate within a certain preferred opening range instead of always operating at a fixed point, the performance of the air conditioner in the medium and low frequency operating mode can be effectively improved, the quality of batch products can be stabilized, and the actual energy consumption of users can be reduced.

Description

Technical Field

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

[0002] With the increasing improvement of people's living standards, air conditioners have become necessities in daily life, and users' requirements for the heating / cooling performance of air conditioners are also getting higher and higher. Generally, an important factor affecting the heating / cooling performance of an air conditioner is the compressor in the air conditioner.

[0003] In the prior art, when a customer turns on the heating / cooling of an air conditioner, the variable-frequency compressor will enter the medium- and low-frequency operating states according to its own control mode after a short period of high-frequency operation. Currently, in the conventional medium- and low-frequency operating modes, the variable-frequency compressor operates at an optimal frequency calculated based on experimental tests or preset algorithms, and parameters such as the opening degree of the electronic expansion valve and the rotational speeds of the internal and external fans also reach the preset optimal operating values, so as to enable the air conditioner to achieve the optimal operating energy efficiency.

[0004] However, the inventor has found that the prior art has at least the following problems: The optimal opening degree of the electronic expansion valve is often a point or a small segment (△L), making it difficult to obtain the optimal opening degree. In addition, due to deviations in components and refrigerants of mass-produced air conditioners, they cannot be made completely consistent, which will cause the deviation of the optimal opening degree. Adopting the control strategy of the prior art will result in that when the whole machine of the air conditioner is in the medium- and low-frequency operating modes during actual operation, it may not operate at the preset or ideal high energy efficiency, thus making the heating / cooling performance of the air conditioner unable to reach the optimal, increasing the power consumption of the air conditioner, and reducing the user experience. Summary of the Invention

[0005] The purpose of the embodiments of the present invention is to provide an operating control method for an air conditioner and an electronic expansion valve, which can effectively stabilize the quality of mass-produced products by adjusting the opening degree of the electronic expansion valve, improve the performance of the air conditioner when it is in the medium- and low-frequency operating modes, and provide a good user experience for users.

[0006] To achieve the above purpose, the embodiments of the present invention provide an air conditioner, including:

[0007] A variable-frequency compressor for realizing the circulation of the refrigerant;

[0008] An electronic expansion valve for adjusting the flow rate of the refrigerant;

[0009] A controller for:

[0010] Obtaining the theoretical optimal opening degree value of the electronic expansion valve when the variable-frequency compressor is in a preset medium- and low-frequency operating mode;

[0011] Determine the optimal opening range of the electronic expansion valve according to the theoretical optimal opening value;

[0012] When the variable-frequency compressor enters the medium and low frequency operation mode, adjust the operating opening of the electronic expansion valve so that the operating opening of the electronic expansion valve reciprocates within the optimal opening range.

[0013] As an improvement of the above solution, when the variable-frequency compressor enters the medium and low frequency operation mode, adjust the operating opening of the electronic expansion valve so that the operating opening of the electronic expansion valve reciprocates within the optimal opening range, specifically:

[0014] When the variable-frequency compressor enters the medium and low frequency operation mode, adjust the operating opening of the electronic expansion valve to the theoretical optimal opening value;

[0015] After the electronic expansion valve operates at the theoretical optimal opening value for a first preset duration, adjust the operating opening of the electronic expansion valve to the lower limit value of the optimal opening range;

[0016] After the electronic expansion valve operates at the lower limit value of the optimal opening range for a first preset duration, adjust the operating opening of the electronic expansion valve to the upper limit value of the optimal opening range;

[0017] After the electronic expansion valve operates at the upper limit value of the optimal opening range for a first preset duration, adjust the operating opening of the electronic expansion valve to the theoretical optimal opening value.

[0018] As an improvement of the above solution, when the variable-frequency compressor enters the medium and low frequency operation mode, adjust the operating opening of the electronic expansion valve so that the operating opening of the electronic expansion valve reciprocates within the optimal opening range, specifically:

[0019] When the variable-frequency compressor enters the medium and low frequency operation mode, adjust the operating opening of the electronic expansion valve to the theoretical optimal opening value;

[0020] After adjusting the operating opening of the electronic expansion valve to the theoretical optimal opening value, at every second preset duration, adjust the current operating opening of the electronic expansion valve according to a first opening adjustment value until the operating opening of the electronic expansion valve reaches the upper limit value of the optimal opening range; the first opening adjustment value is greater than 0;

[0021] After adjusting the operating opening of the electronic expansion valve to the upper limit value of the optimal opening range, at every second preset duration, adjust the current operating opening of the electronic expansion valve according to a second opening adjustment value until the operating opening of the electronic expansion valve reaches the lower limit value of the optimal opening range; the second opening adjustment value is less than 0;

[0022] After adjusting the operating opening of the electronic expansion valve to the lower limit value of the optimal opening range, every second preset time period, adjust the current operating opening of the electronic expansion valve according to the first opening adjustment value until the operating opening of the electronic expansion valve reaches the theoretical optimal opening value.

[0023] As an improvement to the above solution, when the variable frequency compressor enters the medium and low frequency operation mode, adjust the operating opening of the electronic expansion valve so that the operating opening of the electronic expansion valve reciprocally changes within the optimal opening range. Specifically:

[0024] When the variable frequency compressor enters the medium and low frequency operation mode, adjust the operating opening of the electronic expansion valve to the theoretical optimal opening value, and obtain the current operating power of the variable frequency compressor as the first operating power.

[0025] After adjusting the operating opening of the electronic expansion valve to the theoretical optimal opening value, adjust the current operating opening of the electronic expansion valve according to the third opening adjustment value, and after a third preset time period, obtain the current operating power of the variable frequency compressor as the second operating power; the third opening adjustment value is greater than 0.

[0026] According to the power difference between the second operating power and the first operating power, determine the opening adjustment value and adjustment period of the electronic expansion valve, and adjust the current operating opening of the electronic expansion valve according to the opening adjustment value and the adjustment period until the operating opening of the electronic expansion valve reaches the upper limit value or the lower limit value of the optimal opening range.

[0027] When the electronic expansion valve operates at the upper limit value or the lower limit value of the optimal opening range for a fourth preset time period, adjust the operating opening of the electronic expansion valve to the theoretical optimal opening value, and re-obtain the second operating power.

[0028] As an improvement to the above solution, the method for determining the opening adjustment value and adjustment period of the electronic expansion valve according to the power difference between the second operating power and the first operating power is specifically:

[0029] Calculate the power difference △P between the second operating power and the first operating power.

[0030] When the power difference satisfies 0W ≤ △P ≤ 2W, determine the opening adjustment value to be +1.5 steps and the adjustment period to be 10 seconds.

[0031] When the power difference satisfies 2W < △P ≤ 10W, determine the opening adjustment value to be +2.5 steps and the adjustment period to be 10 seconds.

[0032] When the power difference satisfies -2W ≤ ΔP < 0W, determine that the opening adjustment value is -1.5 steps, and the adjustment period is 10 seconds;

[0033] When the power difference satisfies -10W ≤ ΔP < -2W, determine that the opening adjustment value is -2.5 steps, and the adjustment period is 10 seconds.

[0034] As an improvement of the above solution, determining the optimal opening range of the electronic expansion valve according to the theoretical optimal opening value specifically includes:

[0035] Determine the optimal opening range of the electronic expansion valve according to the theoretical optimal opening value and the preset opening value, so that the upper limit value of the optimal opening range is the sum of the theoretical optimal opening value and the preset opening value, and the lower limit value of the optimal opening range is the difference between the theoretical optimal opening value and the preset opening value.

[0036] The present invention also provides an operation control method for an electronic expansion valve, which is applied to an air conditioner. The air conditioner is provided with a variable-frequency compressor for realizing the circulation of the refrigerant and an electronic expansion valve for adjusting the flow rate of the refrigerant;

[0037] The method includes:

[0038] Obtain the theoretical optimal opening value of the electronic expansion valve when the variable-frequency compressor is in a preset medium and low frequency operation mode;

[0039] Determine the optimal opening range of the electronic expansion valve according to the theoretical optimal opening value;

[0040] When the variable-frequency compressor enters the medium and low frequency operation mode, adjust the operation opening of the electronic expansion valve so that the operation opening of the electronic expansion valve reciprocally changes within the optimal opening range.

[0041] As an improvement of the above solution, when the variable-frequency compressor enters the medium and low frequency operation mode, adjusting the operation opening of the electronic expansion valve so that the operation opening of the electronic expansion valve reciprocally changes within the optimal opening range specifically includes:

[0042] When the variable-frequency compressor enters the medium and low frequency operation mode, adjust the operation opening of the electronic expansion valve to the theoretical optimal opening value, and obtain the current operation power of the variable-frequency compressor as the first operation power;

[0043] After adjusting the operating opening of the electronic expansion valve to the theoretical optimal opening value, adjust the current operating opening of the electronic expansion valve according to a third opening adjustment value, and after a third preset time period, obtain the current operating power of the variable-frequency compressor as the second operating power; the third opening adjustment value is greater than 0;

[0044] Determine the opening adjustment value and adjustment period of the electronic expansion valve according to the power difference between the second operating power and the first operating power, and adjust the current operating opening of the electronic expansion valve according to the opening adjustment value and the adjustment period until the operating opening of the electronic expansion valve reaches the upper limit value or the lower limit value of the optimal opening range;

[0045] When the electronic expansion valve operates at the upper limit value or the lower limit value of the optimal opening range for a fourth preset time period, adjust the operating opening of the electronic expansion valve to the theoretical optimal opening value and re-obtain the second operating power.

[0046] As an improvement of the above solution, the determining the opening adjustment value and adjustment period of the electronic expansion valve according to the power difference between the second operating power and the first operating power is specifically:

[0047] Calculate the power difference △P between the second operating power and the first operating power;

[0048] When the power difference satisfies 0W ≤ △P ≤ 2W, determine the opening adjustment value to be +1.5 steps and the adjustment period to be 10 seconds;

[0049] When the power difference satisfies 2W < △P ≤ 10W, determine the opening adjustment value to be +2.5 steps and the adjustment period to be 10 seconds;

[0050] When the power difference satisfies -2W ≤ △P < 0W, determine the opening adjustment value to be -1.5 steps and the adjustment period to be 10 seconds;

[0051] When the power difference satisfies -10W ≤ △P < -2W, determine the opening adjustment value to be -2.5 steps and the adjustment period to be 10 seconds.

[0052] As an improvement of the above solution, the determining the optimal opening range of the electronic expansion valve according to the theoretical optimal opening value is specifically:

[0053] Determine the optimal opening range of the electronic expansion valve according to the theoretical optimal opening value and a preset opening value, so that the upper limit value of the optimal opening range is the sum of the theoretical optimal opening value and the preset opening value, and the lower limit value of the optimal opening range is the difference between the theoretical optimal opening value and the preset opening value.

[0054] Compared with the prior art, the operation control method of the air conditioner and the electronic expansion valve disclosed in the embodiments of the present invention includes a variable-frequency compressor and an electronic expansion valve. After determining the theoretical optimal opening value of the electronic expansion valve, an optimal opening range of the electronic expansion valve is determined according to the theoretical optimal opening value; when the variable-frequency compressor enters the medium and low frequency operation mode, the operation opening of the electronic expansion valve is adjusted so that the operation opening of the electronic expansion valve changes reciprocally within the optimal opening range. By adopting the technical means of the embodiments of the present invention, for air conditioners produced in batches, by adjusting the opening of the electronic expansion valve to make it operate within a certain preferred opening range instead of always operating at a fixed point, the performance of the air conditioner in the medium and low frequency operation mode can be effectively improved, the quality of batch products can be stabilized, and the actual energy consumption of users can be reduced. According to current multiple tests, the air conditioner adopting the embodiments of the present invention has about 1% - 2% higher capacity and energy efficiency compared with the existing conventional air conditioners. Moreover, the embodiments of the present invention do not require additional hardware structures to optimize the performance of the air conditioner in the medium and low frequency operation mode, ensuring the simplicity of the air conditioner structure, reducing the production cost, and providing a good user experience. Description of the Drawings

[0055] Figure 1 is a schematic structural diagram of an air conditioner provided by an embodiment of the present invention;

[0056] Figure 2 is a schematic structural diagram of the outdoor unit in an embodiment of the present invention;

[0057] Figure 3 is a schematic flowchart of the work executed by the controller in the first implementation manner in an embodiment of the present invention;

[0058] Figure 4 is a schematic diagram of the operation performance curve of the air conditioner when the electronic expansion valve operates at different openings in an embodiment of the present invention;

[0059] Figure 5 is a schematic diagram of the operation performance curve of the air conditioner corresponding to the optimal opening range in an embodiment of the present invention;

[0060] Figure 6 is a schematic flowchart of the work executed by the controller in the second implementation manner in an embodiment of the present invention;

[0061] Figure 7 is a schematic flowchart of the work executed by the controller in the third implementation manner in an embodiment of the present invention;

[0062] Figure 8 is a schematic flowchart of the work executed by the controller in the fourth implementation manner in an embodiment of the present invention;

[0063] Figure 9 It is a schematic flowchart of the work executed by the controller in the fifth implementation manner in the embodiments of the present invention;

[0064] Figure 10 It is a schematic flowchart of an operation control method for an electronic expansion valve provided by the embodiments of the present invention. Specific implementation manners

[0065] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts belong to the scope of protection of the present invention.

[0066] The embodiments of the present invention provide an air conditioner, which is internally provided with a variable-frequency compressor and an electronic expansion valve. In one implementation manner, the air conditioner is a split-type air conditioner. Refer to Figure 1 and Figure 2 , Figure 1 is a schematic structural diagram of an air conditioner provided by the embodiments of the present invention, Figure 2 is a schematic structural diagram of the outdoor unit in the embodiments of the present invention. The air conditioner includes an outdoor unit 1 and an indoor unit 2. The outdoor unit 1 is internally provided with a variable-frequency compressor 11 and an electronic expansion valve 12, and also provided with devices such as a condenser and an evaporator. Through a circulation system composed of the variable-frequency compressor 11, the condenser, the electronic expansion valve 12, and the evaporator, etc., the refrigeration / heating cycle of the air conditioner is executed. Among them, the variable-frequency compressor 11 is used to realize the circulation of the refrigerant, and the electronic expansion valve 12 is used to adjust the flow rate and superheat degree of the refrigerant, etc., and is one of the components required to maintain the normal operating pressure difference of the system.

[0067] In another implementation manner, the air conditioner is an integrated air conditioner, and devices such as the variable-frequency compressor and the electronic expansion valve are arranged inside the housing of the air conditioner.

[0068] Furthermore, the air conditioner further includes a controller 3, and the controller 3 is respectively connected to the devices in the air conditioner, so as to realize the acquisition and analysis of information and the operation control of the air conditioner.

[0069] Specifically, refer to Figure 3 , which is a schematic flowchart of the work executed by the controller in the first implementation manner in the embodiments of the present invention. The controller 3 is used to execute steps S11 to S13:

[0070] S11. Obtain the theoretically optimal opening value of the electronic expansion valve when the variable-frequency compressor is in a preset medium and low frequency operation mode;

[0071] S12. Determine the optimal opening range of the electronic expansion valve according to the theoretical optimal opening value;

[0072] S13. When the variable-frequency compressor enters the medium and low-frequency operation mode, adjust the operating opening of the electronic expansion valve so that the operating opening of the electronic expansion valve changes reciprocally within the optimal opening range.

[0073] It should be noted that during the power-on operation of the air conditioner, the variable-frequency compressor will first enter the high-frequency operation mode to achieve the refrigeration / heating effect faster. After a short period of high-frequency operation, the variable-frequency compressor enters the medium and low-frequency operation mode according to its own control mode.

[0074] It can be understood that the operating frequency of the variable-frequency compressor in the medium and low-frequency operation mode is less than that in the high-frequency operation mode. Due to the specific conditions of different models of air conditioners and compressors being different, the setting of the operating frequency of the variable-frequency compressor in the medium and low-frequency operation mode also varies. The range of the operating frequency in the low-frequency operation mode needs to be determined according to the actual situation.

[0075] As an example, in an optional implementation manner, according to the specific operating requirements of the air conditioner, determine the highest operating frequency and the lowest operating frequency of the variable-frequency compressor to obtain an operating frequency range. Divide the operating frequency range into three equal parts to obtain the operating frequencies of the high, medium, and low-frequency bands respectively, so as to determine the operating frequency of the variable-frequency compressor in the medium and low-frequency operation mode. In another optional implementation manner, according to the displacement capacity of the variable-frequency compressor, determine the operating frequency corresponding to less than 50% of the rated capacity as the medium and low-frequency operating frequency. Of course, the above scenarios are only examples. In actual applications, the operating parameters of the variable-frequency compressor in the medium and low-frequency operation mode can be determined according to the actual situation, and no specific limitation is made here.

[0076] In the embodiment of the present invention, refer to Figure 4 , which is a schematic diagram of the operating performance curve of the air conditioner when the electronic expansion valve operates at different openings in the embodiment of the present invention. When the variable-frequency compressor 11 is in the preset medium and low-frequency operation mode, when the electronic expansion valve 12 operates at different openings, the corresponding operating performance of the air conditioner is different. Therefore, determine the opening of the electronic expansion valve when the operating performance of the air conditioner reaches the optimal, that is, Figure 4 the point a in, as the theoretical optimal opening value Tc. In the specific implementation process, determine the theoretical optimal opening value of the electronic expansion valve 12 when the variable-frequency compressor 11 is in the preset medium and low-frequency operation mode through a preset algorithm or test experience, etc.

[0077] It should be noted that the method for determining the theoretical optimal opening value through a preset algorithm can be any preferred method for determining the opening value of a variable-frequency compressor in the prior art. By way of example, it can be to determine the theoretical optimal opening value of the variable-frequency compressor in the medium and low-frequency operation mode according to temperature parameters such as ambient temperature, coil temperature, and exhaust temperature. It can also be to correct or adjust the initial opening value according to the actual operation of the air conditioner after determining the initial opening value of the compressor to obtain the theoretical optimal opening value. It can also be a combination of the above multiple methods, which does not affect the beneficial effects achieved by the present invention.

[0078] It can be understood that in practical applications, Figure 4 Points b and c in are the actual operating points that will inevitably appear due to deviations of air conditioner components or limitations of components. Therefore, if the opening of the electronic expansion valve is not adjusted in real time, it may cause the electronic expansion valve to always operate at an unreasonable opening value, resulting in poor operating performance of the air conditioner.

[0079] Further, according to the theoretical optimal opening value, an optimal opening range of the electronic expansion valve is determined, wherein the theoretical optimal opening value is within the optimal opening range. Refer to Figure 5 , a schematic diagram of the operating performance curve of the air conditioner corresponding to the optimal opening range in the embodiment of the present invention. After determining the opening of the electronic expansion valve when the operating performance of the air conditioner reaches the optimal, that is, point a in the figure as the theoretical optimal opening value Tc, a value is further determined respectively on the left and right of point a to obtain the lower limit value and the upper limit value of the optimal opening range, that is, points d and e.

[0080] In an alternative embodiment, the determining the optimal opening range of the electronic expansion valve according to the theoretical optimal opening value is specifically:

[0081] According to the theoretical optimal opening value Tc and a preset opening value △T, the optimal opening range of the electronic expansion valve is determined, so that the upper limit value of the optimal opening range is the sum of the theoretical optimal opening value and the preset opening value, and the lower limit value of the optimal opening range is the difference between the theoretical optimal opening value and the preset opening value. That is, the determined optimal opening range is [Tc - △T, Tc + △T].

[0082] By way of example, assume that the theoretical optimal opening value Tc = 100 steps and the preset opening value △T is taken as 6 steps. Then the optimal opening range is [94, 106] steps, wherein the upper limit value Tmax = 106 steps and the lower limit value Tmin = 94 steps.

[0083] It can be understood that the preset opening value △T is preset, and its value can be set according to the operating state of the compressor and the actual situation of the operating performance of the air conditioner, and no specific limitation is made here.

[0084] Understandably, the above-described method for determining the optimal opening range is only an optional implementation manner. In the actual application process, the optimal opening range may also be determined according to the theoretical optimal opening and other calculation methods, and no specific limitation is made here.

[0085] Furthermore, after determining the optimal opening range of the electronic expansion valve 12, when the variable-frequency compressor 11 enters the medium and low frequency operation mode, the current operating opening of the electronic expansion valve 12 is adjusted through a certain opening adjustment period and opening adjustment step size, so that its operating opening value varies reciprocally within the optimal opening range, which not only ensures the rationality of the operating opening of the electronic expansion valve, but also avoids the problem that when the actual optimal opening of the variable-frequency compressor is not the initially determined theoretical optimal opening due to factors such as production differences, the electronic expansion valve 12 has been operating at an unreasonable opening value, resulting in poor operating performance of the air conditioner.

[0086] Preferably, the controller 3 is further configured to execute step S14:

[0087] S14. After the variable-frequency compressor continuously operates for a preset operating duration in the medium and low frequency operation mode, re-obtain the theoretical optimal opening value of the electronic expansion valve.

[0088] In the embodiment of the present invention, the variable-frequency compressor 11 re-determines the theoretical optimal opening value every time it operates for a period of time, that is, re-determines the optimal opening range, and adjusts the operating opening of the electronic expansion valve again according to the optimal opening range, so that the theoretical optimal opening value can conform to the actual operating conditions of the air conditioner, and further ensures that the performance of the air conditioner reaches the best state when it is in the medium and low frequency operation mode.

[0089] An embodiment of the present invention provides an air conditioner, which includes a variable-frequency compressor and an electronic expansion valve. After determining the theoretical optimal opening value of the electronic expansion valve, an optimal opening range of the electronic expansion valve is determined according to the theoretical optimal opening value; when the variable-frequency compressor enters a medium and low frequency operation mode, the operating opening of the electronic expansion valve is adjusted so that the operating opening of the electronic expansion valve varies reciprocally within the optimal opening range. By adopting the technical means of the embodiment of the present invention, for air conditioners produced in batches, by adjusting the opening of the electronic expansion valve to make it operate within a certain preferred opening range instead of always operating at a fixed point, the performance of the air conditioner in the medium and low frequency operation mode can be effectively improved, the quality of batch products can be stabilized, and the actual energy consumption of users can be reduced. According to current multiple tests, compared with existing conventional air conditioners, the air conditioner adopting the embodiment of the present invention has about 1% - 2% improvement in capacity and energy efficiency. Moreover, the embodiment of the present invention can optimize the performance of the air conditioner in the medium and low frequency operation mode without adding additional hardware structures, ensuring the simplicity of the air conditioner structure, reducing the production cost, and providing a good user experience for users.

[0090] On the basis of the above embodiment, the embodiment of the present invention provides various preferred implementation manners for adjusting the operating opening of the electronic expansion valve.

[0091] In the first preferred implementation manner, referring to Figure 6 , it is a schematic flowchart of the work executed by the controller in the second implementation manner in the embodiment of the present invention. Step S13, that is, when the variable-frequency compressor enters the medium and low frequency operation mode, adjusting the operating opening of the electronic expansion valve so that the operating opening of the electronic expansion valve varies reciprocally within the optimal opening range, specifically includes:

[0092] When the variable-frequency compressor enters the medium and low frequency operation mode, adjust the operating opening of the electronic expansion valve to the theoretical optimal opening value;

[0093] When the electronic expansion valve operates according to the theoretical optimal opening value for a first preset duration, adjust the operating opening of the electronic expansion valve to the lower limit value of the optimal opening range;

[0094] When the electronic expansion valve operates according to the lower limit value of the optimal opening range for a first preset duration, adjust the operating opening of the electronic expansion valve to the upper limit value of the optimal opening range;

[0095] When the electronic expansion valve operates according to the upper limit value of the optimal opening range for a first preset duration, adjust the operating opening of the electronic expansion valve to the theoretical optimal opening value.

[0096] Optionally, the first preset duration t1 is set to 10 minutes. Taking the theoretical optimal opening value Tc as 100 steps and the preset opening value △T as 6 steps, so the optimal opening range is [94, 106] steps as an example. In the embodiment of the present invention, when the air conditioner is turned on and the variable frequency compressor 11 enters the medium and low frequency operation mode, it operates at the operation frequency of the variable frequency compressor 11 under the conventional setting, and adjusts the operation opening of the electronic expansion valve 12 to the initial value of 100 steps. After continuously operating for 10 minutes, the operation opening of the electronic expansion valve 12 is adjusted to the lower limit value of 94 steps. After continuously operating for another 10 minutes, the operation opening of the electronic expansion valve 12 is adjusted to the upper limit value of 106 steps. After continuously operating for another 10 minutes, the operation opening of the electronic expansion valve 12 is adjusted back to the initial point of 100 steps... and so on. Every 10 minutes of operation, the operation opening of the electronic expansion valve 12 is adjusted once, so as to reciprocally change within the optimal opening range.

[0097] It can be understood that the value of the first preset duration t1 in the above scenario is only for illustration. In actual applications, it can be set and adjusted according to the actual operation conditions, and no specific limitation is made here.

[0098] In the second preferred embodiment, refer to Figure 7 , which is the flow chart of the work executed by the controller in the third embodiment of the present invention. Step S13, that is, when the variable frequency compressor enters the medium and low frequency operation mode, adjust the operation opening of the electronic expansion valve so that the operation opening of the electronic expansion valve reciprocally changes within the optimal opening range. Specifically:

[0099] When the variable frequency compressor enters the medium and low frequency operation mode, adjust the operation opening of the electronic expansion valve to the theoretical optimal opening value;

[0100] After adjusting the operation opening of the electronic expansion valve to the theoretical optimal opening value, every second preset duration, adjust the current operation opening of the electronic expansion valve according to the first opening adjustment value until the operation opening of the electronic expansion valve reaches the upper limit value of the optimal opening range; the first opening adjustment value is greater than 0;

[0101] After adjusting the operation opening of the electronic expansion valve to the upper limit value of the optimal opening range, every second preset duration, adjust the current operation opening of the electronic expansion valve according to the second opening adjustment value until the operation opening of the electronic expansion valve reaches the lower limit value of the optimal opening range; the second opening adjustment value is less than 0;

[0102] After adjusting the operating opening of the electronic expansion valve to the lower limit value of the optimal opening range, every second preset time period, adjust the current operating opening of the electronic expansion valve according to the first opening adjustment value until the operating opening of the electronic expansion valve reaches the theoretical optimal opening value.

[0103] Optionally, the second preset time period t2 is set to 3 minutes, the first opening adjustment value △T1 is set to +2 steps, and the second opening adjustment value △T2 is set to -2 steps. Taking the theoretical optimal opening value Tc as 100 steps and the preset opening value △T as 6 steps, so the optimal opening range is [94, 106] steps as an example. In the embodiment of the present invention, when the air conditioner is turned on and the variable frequency compressor 11 enters the medium and low frequency operation mode, it operates according to the operating frequency of the variable frequency compressor 11 under the conventional setting, and adjusts the operating opening of the electronic expansion valve 12 to 100 steps. After continuously operating for 3 minutes, the operating opening of the electronic expansion valve 12 is increased by 2 steps. After continuously operating for another 3 minutes, it is increased by 2 steps again, and so on. Every 3 minutes, the operating opening of the electronic expansion valve 12 is increased until the operating opening of the electronic expansion valve 12 is increased to the upper limit value of 106 steps. After continuously operating for 3 minutes, the operating opening of the electronic expansion valve 12 is decreased by 2 steps. After continuously operating for another 3 minutes, it is decreased by 2 steps again, and so on. Every 3 minutes, the operating opening of the electronic expansion valve 12 is decreased until the operating opening of the electronic expansion valve 12 is decreased to the lower limit value of 94 steps. After that, the operating opening of the electronic expansion valve 12 is increased again every 3 minutes, so that the operating opening of the electronic expansion valve 12 reciprocally changes within the optimal opening range [94, 106] with a certain period and a certain step size.

[0104] It can be understood that the second preset time period t2, the first opening adjustment value, and the second opening adjustment value in the above scenario are only examples. In actual applications, they can be set and adjusted according to the actual operating conditions, and no specific limitations are made here.

[0105] By adopting the technical means of the embodiment of the present invention, through a certain opening adjustment value and adjustment period, controlling the operating opening of the electronic expansion valve 12 to reciprocally change within the optimal opening range can effectively improve the performance of the air conditioner in the medium and low frequency operation mode, stabilize the quality of mass-produced products, and reduce the actual energy consumption of users.

[0106] In the third preferred implementation manner, refer to Figure 8 , which is a schematic flowchart of the work executed by the controller in the fourth implementation manner in the embodiment of the present invention. Step S13, that is, when the variable frequency compressor enters the medium and low frequency operation mode, adjust the operating opening of the electronic expansion valve so that the operating opening of the electronic expansion valve reciprocally changes within the optimal opening range, specifically:

[0107] When the variable-frequency compressor enters the medium and low frequency operation mode, adjust the operation opening degree of the electronic expansion valve to the theoretical optimal opening degree value, and obtain the current operation power of the variable-frequency compressor as the first operation power;

[0108] After adjusting the operation opening degree of the electronic expansion valve to the theoretical optimal opening degree value, adjust the current operation opening degree of the electronic expansion valve according to the third opening degree adjustment value, and after a third preset time period, obtain the current operation power of the variable-frequency compressor as the second operation power; the third opening degree adjustment value is greater than 0;

[0109] According to the power difference between the second operation power and the first operation power, determine the opening degree adjustment value and adjustment period of the electronic expansion valve, and adjust the current operation opening degree of the electronic expansion valve according to the opening degree adjustment value and the adjustment period until the operation opening degree of the electronic expansion valve reaches the upper limit value or the lower limit value of the optimal opening degree interval;

[0110] When the electronic expansion valve operates at the upper limit value or the lower limit value of the optimal opening degree interval for a fourth preset time period, adjust the operation opening degree of the electronic expansion valve to the theoretical optimal opening degree value, and re-obtain the second operation power.

[0111] Optionally, the third preset time period t3 is set to 10 seconds, the fourth preset time period t4 is set to 60 seconds, and the third opening degree adjustment value △T3 is set to +1 step. Taking the theoretical optimal opening degree value Tc as 100 steps and the preset opening degree value △T as 6 steps, so the optimal opening degree interval is [94, 106] steps as an example. In the embodiment of the present invention, when the air conditioner is turned on and the variable-frequency compressor 11 enters the medium and low frequency operation mode, it operates at the operation frequency of the variable-frequency compressor 11 under the conventional setting, and adjusts the operation opening degree of the electronic expansion valve 12 to 100 steps. At the same time, obtain the current operation power P0 of the variable-frequency compressor. Then, increase the operation opening degree of the electronic expansion valve 12 by 1 step. After continuously operating for 10 seconds, obtain the current operation power P of the variable-frequency compressor again, calculate the power difference △P = P - P0. According to the corresponding relationship between the preset power difference and the opening degree adjustment value and the adjustment period, determine the opening degree adjustment value and the adjustment period corresponding to the current power difference P0, and then perform real-time adjustment on the current operation opening degree of the electronic expansion valve 12. The opening degree adjustment value can be positive or negative, so the adjustment of the electronic expansion valve 12 can be an increase or a decrease until the operation opening degree of the electronic expansion valve reaches the limit value of the optimal opening degree interval, that is, the upper limit value or the lower limit value, and after operating for 60 seconds, re-adjust the operation opening degree of the electronic expansion valve to the initial value of 100 steps, and re-obtain the current operation power P of the variable-frequency compressor, re-calculate the power difference △P, and determine the corresponding opening degree adjustment value and adjustment period to adjust the opening degree of the electronic expansion valve 12 accordingly.

[0112] It can be understood that in the above scenario, the third preset duration t3, the fourth preset duration t4, and the third opening adjustment value are only for example. In actual applications, they can be set and adjusted according to the actual operating conditions, and no specific limitations are made here.

[0113] More preferably, referring to Figure 9 , it is a schematic flowchart of the work executed by the controller in the fifth implementation manner in the embodiments of the present invention. On the basis of the previous embodiment, determining the opening adjustment value and the adjustment period of the electronic expansion valve according to the power difference between the second operating power and the first operating power specifically includes:

[0114] Calculating the power difference △P between the second operating power and the first operating power;

[0115] When the power difference satisfies 0W ≤ △P ≤ 2W, determining that the opening adjustment value is +1.5 steps and the adjustment period is 10 seconds;

[0116] When the power difference satisfies 2W < △P ≤ 10W, determining that the opening adjustment value is +2.5 steps and the adjustment period is 10 seconds;

[0117] When the power difference satisfies -2W ≤ △P < 0W, determining that the opening adjustment value is -1.5 steps and the adjustment period is 10 seconds;

[0118] When the power difference satisfies -10W ≤ △P < -2W, determining that the opening adjustment value is -2.5 steps and the adjustment period is 10 seconds.

[0119] Specifically, after the variable-frequency compressor 11 enters the medium and low-frequency operation mode, adjust the operation opening degree of the electronic expansion valve 12 by 100 steps, calculate the power difference △P. When the calculated power difference satisfies 0W ≤ △P ≤ 2W, increase the operation opening degree of the electronic expansion valve 12 by 1.5 steps every 10 seconds. Or when the calculated power difference satisfies 2W < △P ≤ 10W, increase the operation opening degree of the electronic expansion valve 12 by 2.5 steps every 10 seconds until the operation opening degree of the electronic expansion valve 12 is increased to the upper limit value of 106 steps and runs for 60 seconds. Then, readjust the operation opening degree of the electronic expansion valve to the initial value of 100 steps, and re-obtain the current operation power P of the variable-frequency compressor, and recalculate the power difference △P. When the calculated power difference satisfies -2W ≤ △P < 0W, decrease the operation opening degree of the electronic expansion valve 12 by 1.5 steps every 10 seconds. Or when the calculated power difference satisfies -10W ≤ △P < -2W, decrease the operation opening degree of the electronic expansion valve 12 by 2.5 steps every 10 seconds until the operation opening degree of the electronic expansion valve 12 is decreased to the lower limit value of 94 steps and runs for 60 seconds. Then, readjust the operation opening degree of the electronic expansion valve to the initial value of 100 steps, and re-obtain the current operation power P of the variable-frequency compressor, and recalculate the power difference △P, and so on, so that the operation opening degree of the electronic expansion valve 12 changes reciprocally within the optimal opening degree interval.

[0120] By adopting the technical means of the embodiment of the present invention, according to the change situation of the operation power of the variable-frequency compressor, determine the opening degree adjustment value and adjustment period of the electronic expansion valve, and control the operation opening degree of the electronic expansion valve 12 to change reciprocally within the optimal opening degree interval, which can effectively improve the performance of the air conditioner in the medium and low-frequency operation mode, stabilize the quality of batch products, and reduce the actual energy consumption of users.

[0121] See Figure 10 , which is a schematic flow chart of an operation control method for an electronic expansion valve provided by an embodiment of the present invention. An embodiment of the present invention provides an operation control method for an electronic expansion valve, which is applied to an air conditioner. The air conditioner is internally provided with a variable-frequency compressor for realizing the circulation of the refrigerant, and an electronic expansion valve for adjusting the flow rate of the refrigerant.

[0122] The operation control method of the electronic expansion valve is executed through steps S21 to S23:

[0123] S21. Obtain the theoretical optimal opening degree value of the electronic expansion valve when the variable-frequency compressor is in a preset medium and low-frequency operation mode;

[0124] S22. Determine the optimal opening degree interval of the electronic expansion valve according to the theoretical optimal opening degree value;

[0125] S23. When the variable-frequency compressor enters the medium and low frequency operation mode, adjust the operation opening degree of the electronic expansion valve so that the operation opening degree of the electronic expansion valve changes reciprocally within the optimal opening degree range.

[0126] In one implementation manner, determining the optimal opening degree range of the electronic expansion valve according to the theoretical optimal opening degree value specifically includes:

[0127] Determine the optimal opening degree range of the electronic expansion valve according to the theoretical optimal opening degree value and the preset opening degree value, so that the upper limit value of the optimal opening degree range is the sum of the theoretical optimal opening degree value and the preset opening degree value, and the lower limit value of the optimal opening degree range is the difference between the theoretical optimal opening degree value and the preset opening degree value.

[0128] By using the technical means of the embodiments of the present invention, for air conditioners in mass production, by adjusting the opening degree of the electronic expansion valve to make it operate within a certain preferred opening degree range instead of always operating at a fixed point, it can effectively improve the performance of the air conditioner when it is in the medium and low frequency operation mode, stabilize the quality of mass-produced products, reduce the actual energy consumption of users. According to current multiple tests, compared with existing conventional air conditioners, the air conditioner adopting the embodiments of the present invention has about 1% - 2% improvement in capacity and energy efficiency. Moreover, the embodiments of the present invention do not need to additionally increase other hardware structures to achieve the optimization of the performance of the air conditioner when it is in the medium and low frequency operation mode, ensuring the simplicity of the air conditioner structure, reducing the production cost, and providing users with a good use experience.

[0129] As a preferred implementation manner, step S23, that is, when the variable-frequency compressor enters the medium and low frequency operation mode, adjust the operation opening degree of the electronic expansion valve so that the operation opening degree of the electronic expansion valve changes reciprocally within the optimal opening degree range, specifically includes:

[0130] When the variable-frequency compressor enters the medium and low frequency operation mode, adjust the operation opening degree of the electronic expansion valve to the theoretical optimal opening degree value, and obtain the current operation power of the variable-frequency compressor as the first operation power;

[0131] After adjusting the operation opening degree of the electronic expansion valve to the theoretical optimal opening degree value, adjust the current operation opening degree of the electronic expansion valve according to the third opening degree adjustment value, and after a third preset time period, obtain the current operation power of the variable-frequency compressor as the second operation power; the third opening degree adjustment value is greater than 0.

[0132] Determine the opening adjustment value and adjustment period of the electronic expansion valve according to the power difference between the second operating power and the first operating power, and adjust the current operating opening of the electronic expansion valve according to the opening adjustment value and the adjustment period until the operating opening of the electronic expansion valve reaches the upper limit or the lower limit of the optimal opening range;

[0133] After the variable-frequency compressor operates at the upper limit or the lower limit of the optimal opening range for a fourth preset duration, adjust the operating opening of the electronic expansion valve to the theoretical optimal opening value, and re-obtain the second operating power.

[0134] Preferably, the determining the opening adjustment value and adjustment period of the electronic expansion valve according to the power difference between the second operating power and the first operating power is specifically as follows:

[0135] Calculate the power difference △P between the second operating power and the first operating power;

[0136] When the power difference satisfies 0W ≤ △P ≤ 2W, determine that the opening adjustment value is +1.5 steps and the adjustment period is 10 seconds;

[0137] When the power difference satisfies 2W < △P ≤ 10W, determine that the opening adjustment value is +2.5 steps and the adjustment period is 10 seconds;

[0138] When the power difference satisfies -2W ≤ △P < 0W, determine that the opening adjustment value is -1.5 steps and the adjustment period is 10 seconds;

[0139] When the power difference satisfies -10W ≤ △P < -2W, determine that the opening adjustment value is -2.5 steps and the adjustment period is 10 seconds.

[0140] By adopting the technical means of the embodiment of the present invention, according to the change situation of the operating power of the variable-frequency compressor, determine the opening adjustment value and adjustment period of the electronic expansion valve, and control the operating opening of the electronic expansion valve 12 to reciprocally change within the optimal opening range, which can effectively improve the performance of the air conditioner in the medium and low frequency operating mode, stabilize the quality of batch products, and reduce the actual energy consumption of users.

[0141] It should be noted that the method of adjusting the operating opening of the electronic expansion valve is not limited to the above scenario. In practical applications, other methods can also be adopted according to the actual situation to adjust the operating opening of the electronic expansion valve to reciprocally change within the optimal opening range, which will not affect the beneficial effects achieved by the present invention.

[0142] It should be noted that the operation control method of an electronic expansion valve provided by an embodiment of the present invention is the same as all the process steps executed by a controller of an air conditioner in the above embodiment, and the working principles and beneficial effects of the two correspond one by one, so they will not be elaborated here.

[0143] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above methods. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM), etc.

[0144] The above is the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications are also regarded as the protection scope of the present invention.

Claims

1. An air conditioner, characterized in that, it includes: a variable-frequency compressor for realizing the circulation of the refrigerant; an electronic expansion valve for adjusting the flow rate of the refrigerant; a controller for: acquiring the theoretical optimal opening value of the electronic expansion valve when the variable-frequency compressor is in a preset medium and low frequency operation mode; determining the optimal opening range of the electronic expansion valve according to the theoretical optimal opening value; when the variable-frequency compressor enters the medium and low frequency operation mode, adjusting the operating opening of the electronic expansion valve so that the operating opening of the electronic expansion valve reciprocally changes within the optimal opening range; the step of, when the variable-frequency compressor enters the medium and low frequency operation mode, adjusting the operating opening of the electronic expansion valve so that the operating opening of the electronic expansion valve reciprocally changes within the optimal opening range, specifically is: when the variable-frequency compressor enters the medium and low frequency operation mode, adjusting the operating opening of the electronic expansion valve to the theoretical optimal opening value; when the electronic expansion valve operates at the theoretical optimal opening value for a first preset time period, adjusting the operating opening of the electronic expansion valve to the lower limit value of the optimal opening range; when the electronic expansion valve operates at the lower limit value of the optimal opening range for a first preset time period, adjusting the operating opening of the electronic expansion valve to the upper limit value of the optimal opening range; when the electronic expansion valve operates at the upper limit value of the optimal opening range for a first preset time period, adjusting the operating opening of the electronic expansion valve to the theoretical optimal opening value.

2. The air conditioner according to claim 1, characterized in that, the step of, when the variable-frequency compressor enters the medium and low frequency operation mode, adjusting the operating opening of the electronic expansion valve so that the operating opening of the electronic expansion valve reciprocally changes within the optimal opening range, specifically is: when the variable-frequency compressor enters the medium and low frequency operation mode, adjusting the operating opening of the electronic expansion valve to the theoretical optimal opening value; after adjusting the operating opening of the electronic expansion valve to the theoretical optimal opening value, at every second preset time period, adjusting the current operating opening of the electronic expansion valve according to a first opening adjustment value until the operating opening of the electronic expansion valve reaches the upper limit value of the optimal opening range; the first opening adjustment value is greater than 0; after adjusting the operating opening of the electronic expansion valve to the upper limit value of the optimal opening range, at every second preset time period, adjusting the current operating opening of the electronic expansion valve according to a second opening adjustment value until the operating opening of the electronic expansion valve reaches the lower limit value of the optimal opening range; the second opening adjustment value is less than 0; after adjusting the operating opening of the electronic expansion valve to the lower limit value of the optimal opening range, at every second preset time period, adjusting the current operating opening of the electronic expansion valve according to the first opening adjustment value until the operating opening of the electronic expansion valve reaches the theoretical optimal opening value.

3. The air conditioner according to claim 1, characterized in that, When the variable-frequency compressor enters the medium and low frequency operation mode, adjust the operation opening degree of the electronic expansion valve so that the operation opening degree of the electronic expansion valve changes reciprocally within the optimal opening degree range. Specifically: When the variable-frequency compressor enters the medium and low frequency operation mode, adjust the operation opening degree of the electronic expansion valve to the theoretical optimal opening degree value, and obtain the current operation power of the variable-frequency compressor as the first operation power; After adjusting the operation opening degree of the electronic expansion valve to the theoretical optimal opening degree value, adjust the current operation opening degree of the electronic expansion valve according to the third opening degree adjustment value, and after a third preset time period, obtain the current operation power of the variable-frequency compressor as the second operation power; the third opening degree adjustment value is greater than 0; According to the power difference between the second operation power and the first operation power, determine the opening degree adjustment value and the adjustment period of the electronic expansion valve, and adjust the current operation opening degree of the electronic expansion valve according to the opening degree adjustment value and the adjustment period until the operation opening degree of the electronic expansion valve reaches the upper limit value or the lower limit value of the optimal opening degree range; When the electronic expansion valve operates at the upper limit value or the lower limit value of the optimal opening degree range for a fourth preset time period, adjust the operation opening degree of the electronic expansion valve to the theoretical optimal opening degree value, and re-obtain the second operation power.

4. The air conditioner according to claim 3, wherein, The determining the opening degree adjustment value and the adjustment period of the electronic expansion valve according to the power difference between the second operation power and the first operation power is specifically: Calculate the power difference △P between the second operation power and the first operation power; When the power difference satisfies 0W ≤ △P ≤ 2W, determine the opening degree adjustment value to be +1.5 steps and the adjustment period to be 10 seconds; When the power difference satisfies 2W < △P ≤ 10W, determine the opening degree adjustment value to be +2.5 steps and the adjustment period to be 10 seconds; When the power difference satisfies -2W ≤ △P < 0W, determine the opening degree adjustment value to be -1.5 steps and the adjustment period to be 10 seconds; When the power difference satisfies -10W ≤ △P < -2W, determine the opening degree adjustment value to be -2.5 steps and the adjustment period to be 10 seconds.

5. The air conditioner according to any one of claims 1 to 4, wherein, The determining the optimal opening degree range of the electronic expansion valve according to the theoretical optimal opening degree value is specifically: According to the theoretical optimal opening degree value and the preset opening degree value, determine the optimal opening degree range of the electronic expansion valve so that the upper limit value of the optimal opening degree range is the sum of the theoretical optimal opening degree value and the preset opening degree value, and the lower limit value of the optimal opening degree range is the difference between the theoretical optimal opening degree value and the preset opening degree value.

6. A method for controlling the operation of an electronic expansion valve, wherein, Applied to an air conditioner, the air conditioner is provided with a variable-frequency compressor for realizing the circulation of the refrigerant and an electronic expansion valve for adjusting the flow rate of the refrigerant; The method includes: Obtain the theoretical optimal opening value of the electronic expansion valve when the variable-frequency compressor is in a preset medium and low frequency operation mode; Determine the optimal opening range of the electronic expansion valve according to the theoretical optimal opening value; When the variable-frequency compressor enters the medium and low frequency operation mode, adjust the operating opening of the electronic expansion valve so that the operating opening of the electronic expansion valve reciprocally changes within the optimal opening range; The step of, when the variable-frequency compressor enters the medium and low frequency operation mode, adjusting the operating opening of the electronic expansion valve so that the operating opening of the electronic expansion valve reciprocally changes within the optimal opening range, specifically is: When the variable-frequency compressor enters the medium and low frequency operation mode, adjust the operating opening of the electronic expansion valve to the theoretical optimal opening value; After the electronic expansion valve operates at the theoretical optimal opening value for a first preset duration, adjust the operating opening of the electronic expansion valve to the lower limit value of the optimal opening range; After the electronic expansion valve operates at the lower limit value of the optimal opening range for a first preset duration, adjust the operating opening of the electronic expansion valve to the upper limit value of the optimal opening range; After the electronic expansion valve operates at the upper limit value of the optimal opening range for a first preset duration, adjust the operating opening of the electronic expansion valve to the theoretical optimal opening value.

7. The method for controlling the operation of the electronic expansion valve according to claim 6, characterized in that, the step of, when the variable-frequency compressor enters the medium and low frequency operation mode, adjusting the operating opening of the electronic expansion valve so that the operating opening of the electronic expansion valve reciprocally changes within the optimal opening range, specifically is: When the variable-frequency compressor enters the medium and low frequency operation mode, adjust the operating opening of the electronic expansion valve to the theoretical optimal opening value, and obtain the current operating power of the variable-frequency compressor as the first operating power; After adjusting the operating opening of the electronic expansion valve to the theoretical optimal opening value, adjust the current operating opening of the electronic expansion valve according to a third opening adjustment value, and after a third preset duration, obtain the current operating power of the variable-frequency compressor as the second operating power; the third opening adjustment value is greater than 0; Determine the opening adjustment value and adjustment period of the electronic expansion valve according to the power difference between the second operating power and the first operating power, and adjust the current operating opening of the electronic expansion valve according to the opening adjustment value and the adjustment period until the operating opening of the electronic expansion valve reaches the upper limit value or the lower limit value of the optimal opening range; After the electronic expansion valve operates at the upper limit value or the lower limit value of the optimal opening range for a fourth preset duration, adjust the operating opening of the electronic expansion valve to the theoretical optimal opening value, and re-obtain the second operating power.

8. The method for controlling the operation of the electronic expansion valve according to claim 7, characterized in that, the step of determining the opening adjustment value and adjustment period of the electronic expansion valve according to the power difference between the second operating power and the first operating power, specifically is: Calculate the power difference △P between the second operating power and the first operating power; When the power difference satisfies 0W ≤ ΔP ≤ 2W, determine that the opening adjustment value is +1.5 steps, and the adjustment period is 10 seconds; When the power difference satisfies 2W < ΔP ≤ 10W, determine that the opening adjustment value is +2.5 steps, and the adjustment period is 10 seconds; When the power difference satisfies -2W ≤ ΔP < 0W, determine that the opening adjustment value is -1.5 steps, and the adjustment period is 10 seconds; When the power difference satisfies -10W ≤ ΔP < -2W, determine that the opening adjustment value is -2.5 steps, and the adjustment period is 10 seconds.

9. The operation control method of the electronic expansion valve according to any one of claims 6 to 8, characterized in that the determining the optimal opening range of the electronic expansion valve according to the theoretical optimal opening value is specifically: Determine the optimal opening range of the electronic expansion valve according to the theoretical optimal opening value and the preset opening value, so that the upper limit value of the optimal opening range is the sum of the theoretical optimal opening value and the preset opening value, and the lower limit value of the optimal opening range is the difference between the theoretical optimal opening value and the preset opening value.

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