Control device and control method for an indoor electronic expansion valve and a compressor

Abstract

The application provides an indoor unit electronic expansion valve and a control device and control method of a compressor. The control method comprises: detecting the operation mode of an air conditioning system, the indoor heat exchanger temperature, the opening degree of the indoor unit electronic expansion valve and the current frequency of the compressor in real time; calculating the target opening degree of the indoor unit electronic expansion valve according to the sum of the current opening degree of the indoor unit electronic expansion valve and the opening degree change amount, wherein the opening degree change amount is related to the difference between the operation mode of the air conditioning system, the indoor heat exchanger temperature and the preset target temperature range; comparing the target opening degree with the preset maximum opening degree and the preset minimum opening degree; determining the frequency change value of the compressor according to the comparison result of the target opening degree with the maximum opening degree and the minimum opening degree; calculating the target frequency of the compressor according to the sum of the frequency change value and the current frequency of the compressor, and controlling the compressor to operate at the target frequency. The control method can meet the needs of users more quickly, improve the user experience, and save energy at the same time.

Description

Technical Field

[0001] This invention relates to the field of air conditioning, specifically to a control device and control method for an indoor unit's electronic expansion valve and compressor. Background Technology

[0002] With economic and social development, the requirements for carbon dioxide emissions per unit of GDP are becoming increasingly stringent. Statistics show that total building energy consumption has been rising year by year, its proportion of total energy consumption increasing from 10% in the late 1970s to 27.8% in recent years. Heating and air conditioning are the largest energy-consuming sectors in buildings, accounting for 55% of total building energy consumption in my country. Therefore, energy conservation in air conditioning systems is of great significance in reducing total building energy consumption.

[0003] In existing multi-split air conditioning systems, the opening of the indoor unit's electronic expansion valve is usually intelligently adjusted based on the deviation between the real-time detected indoor unit coil temperature and the target coil temperature. However, when the opening is adjusted beyond the operating range of the electronic expansion valve, there is a lack of effective logic to further adjust the operation of the air conditioning system, making it difficult to meet user needs. Summary of the Invention

[0004] To address the above problems, this invention provides a control device and method for an indoor unit electronic expansion valve and a compressor. By comparing the target opening degree of the indoor unit electronic expansion valve with the maximum and minimum opening degrees, the change value of the compressor frequency and the target frequency are determined. The compressor is then controlled to operate at the target frequency, adjusting the refrigerant flow in the air conditioning system. This improves the intelligence of the air conditioning system's control logic and its adaptability when the opening degree of the indoor unit electronic expansion valve exceeds the operating range. Furthermore, operating at the new target frequency, the air conditioning system can more quickly meet user needs, enhance user experience, and simultaneously save energy.

[0005] This invention provides a control method for an indoor unit electronic expansion valve and a compressor in an air conditioning system. The air conditioning system includes an indoor heat exchanger, a compressor, and an indoor unit electronic expansion valve connected in series with the indoor heat exchanger. The control method includes the following steps:

[0006] Testing steps: Real-time monitoring of the air conditioning system's operating mode, indoor heat exchanger temperature, indoor unit electronic expansion valve opening, and compressor current frequency;

[0007] Target opening degree acquisition steps: Calculate the target opening degree of the indoor unit's electronic expansion valve based on the sum of the current opening degree and the opening degree change ΔEXV. The opening degree change is related to the operating mode of the air conditioning system and the difference between the indoor heat exchanger temperature and the preset target temperature range.

[0008] Opening comparison steps: Compare the target opening with the preset maximum opening and the preset minimum opening;

[0009] Frequency change value acquisition steps: Determine the compressor frequency change value based on the comparison results between the target opening degree and the maximum and / or minimum opening degree;

[0010] Compressor frequency adjustment steps: Calculate the target frequency of the compressor based on the sum of the frequency change value and the current frequency of the compressor, and control the compressor to operate at the target frequency.

[0011] According to this technical solution, the opening change and target opening are calculated by combining the operating mode and the difference between the indoor heat exchanger temperature and the target temperature. Based on the comparison between the target opening and the maximum and / or minimum opening (including cases where the electronic expansion valve opening exceeds the operating range), the compressor frequency change and target frequency are adjusted, thereby regulating the refrigerant flow of the air conditioning system. This improves the intelligence of the air conditioning system's control logic and its adaptability when the indoor unit's electronic expansion valve opening exceeds the operating range. Furthermore, operating at the new target frequency, the air conditioning system can meet user needs more quickly, enhance user experience, and simultaneously save energy.

[0012] In an optional technical solution of the present invention, between the detection step and the target opening acquisition step, the following further step is included:

[0013] Temperature comparison steps: Compare the indoor heat exchanger temperature with the target temperature range;

[0014] Steps for obtaining the change in opening degree: In cooling mode, if the indoor heat exchanger temperature is within the first target temperature range, the change in opening degree ΔEXV is 0; if the indoor heat exchanger temperature is not within the first target temperature range, the change in opening degree ΔEXV = (t2b - t2b_target)·e, where e is the opening degree correction coefficient; t2b is the indoor heat exchanger temperature in cooling mode, which is the temperature at the middle of the indoor heat exchanger; t2b_target is the first target temperature of the indoor heat exchanger in cooling mode.

[0015] In heating mode, if the indoor heat exchanger temperature is within the second target temperature range, the opening change ΔEXV is 0; if the indoor heat exchanger temperature is not within the second target temperature range, the opening change ΔEXV = (t2_target - t2)·e, where e is the opening correction coefficient; t2 is the indoor heat exchanger temperature in heating mode, which is the outlet temperature of the indoor heat exchanger; t2_target is the second target temperature of the indoor heat exchanger in heating mode.

[0016] According to this technical solution, the location where the indoor heat exchanger temperature is collected is different under different operating modes, which can improve the accuracy of the indoor heat exchanger temperature and thus improve the accuracy of the calculation results of the opening change of the indoor unit's electronic expansion valve, thereby providing accurate data for the adjustment of the compressor frequency.

[0017] In an optional technical solution of the present invention, in cooling mode, the lower limit of the first target temperature range is lower than the first target temperature, and the upper limit of the first target temperature range is greater than the first target temperature; and / or in heating mode, the lower limit of the second target temperature range is lower than the second target temperature, and the upper limit of the second target temperature range is greater than the second target temperature.

[0018] According to this technical solution, different target temperatures correspond to different cooling or heating modes. The change value of the indoor unit's electronic expansion valve is determined based on the comparison between the indoor heat exchanger temperature and the target temperature. This improves the accuracy of obtaining the target opening of the indoor unit's electronic expansion valve, thereby improving the accuracy of the compressor's operating frequency in the entire control method, enhancing the user experience, and enabling the air conditioning system to operate efficiently and energy-savingly.

[0019] In the optional technical solution of the present invention, the value range of the opening correction coefficient is 7-9.

[0020] According to this technical solution, selecting an appropriate opening correction coefficient can improve the accuracy of the opening control of the indoor unit's electronic expansion valve, so that the opening of the indoor unit's electronic expansion valve is compatible with the operation of the air conditioning system, and ensure the operating energy efficiency of the air conditioning system.

[0021] In an optional technical solution of the present invention, in the step of obtaining the frequency change value, determining the compressor frequency change value based on the comparison result between the target opening degree and the maximum and minimum opening degrees includes:

[0022] If the minimum opening is less than or equal to the target opening and less than or equal to the maximum opening, then return to the temperature comparison step.

[0023] If the target opening degree is greater than the maximum opening degree, then the compressor frequency change value ΔRPS = (target opening degree - maximum opening degree) · μ;

[0024] If the target opening degree is less than the minimum opening degree, the compressor frequency change value ΔRPS = (target opening degree - minimum opening degree) · μ, where μ is the compressor frequency correction coefficient.

[0025] According to this technical solution, when the target opening of the indoor unit's electronic expansion valve is between the minimum and maximum opening, the valve's opening remains unchanged, and the process returns to the temperature comparison step to enter the next cycle. When the target opening is greater than the maximum opening or less than the minimum opening, i.e., when the target opening of the indoor unit's electronic expansion valve exceeds its operating range, the compressor's frequency change value is calculated by multiplying the difference between the target opening and the maximum / minimum opening by a frequency correction coefficient. Combined with the compressor's current frequency, the compressor is controlled to operate at the target frequency to regulate the refrigerant flow of the indoor unit, improving user experience while also saving energy. Specifically, when the target opening is greater than the maximum opening, the compressor frequency is increased; when the target opening is less than the minimum opening, the compressor frequency is decreased.

[0026] In the optional technical solution of the present invention, the value range of the frequency correction coefficient is 0.2-0.3.

[0027] According to this technical solution, selecting an appropriate frequency correction coefficient can improve the accuracy of compressor frequency control and ensure the efficient and stable operation of the air conditioning system.

[0028] In an optional technical solution of the present invention, the method further includes: returning to the detection step after the compressor frequency adjustment step.

[0029] According to this technical solution, after the frequency adjustment step, the system returns to the detection step, which can detect the operating status of the air conditioning system in real time. When the operating mode, indoor heat exchanger temperature, compressor frequency, etc. change, the opening degree of the indoor unit's electronic expansion valve and the current frequency of the compressor are adjusted in a timely manner to ensure the long-term stable operation of the air conditioning system.

[0030] Another aspect of the present invention provides a control device for an indoor unit electronic expansion valve and a compressor of an air conditioning system. The air conditioning system includes an indoor heat exchanger, a compressor, and an indoor unit electronic expansion valve connected in series with the indoor heat exchanger. The control device includes:

[0031] The detection module is used to detect the operating mode of the air conditioning system, the temperature of the indoor heat exchanger, the opening degree of the indoor unit's electronic expansion valve, and the current frequency of the compressor in real time.

[0032] The target opening degree acquisition module is used to calculate the target opening degree of the indoor unit's electronic expansion valve based on the sum of the current opening degree and the opening degree change ΔEXV. The opening degree change is related to the operating mode of the air conditioning system and the difference between the indoor heat exchanger temperature and the preset target temperature range.

[0033] The opening comparison module is used to compare the target opening with the preset maximum opening and the preset minimum opening.

[0034] The frequency change value acquisition module is used to determine the compressor's frequency change value based on the comparison between the target opening degree and the maximum and / or minimum opening degree.

[0035] The compressor frequency regulation module is used to calculate the compressor's target frequency based on the sum of the frequency change value and the compressor's current frequency, and to control the compressor to operate at the target frequency.

[0036] The optional technical solution of the present invention further includes: a temperature comparison module for comparing the indoor heat exchanger temperature with a target temperature range; and an opening change acquisition module configured to: in cooling mode, if the indoor heat exchanger temperature is within the first target temperature range, the opening change ΔEXV is 0; if the indoor heat exchanger temperature is not within the first target temperature range, the opening change ΔEXV = (t2b - t2b_target)·e, where e is the opening correction coefficient; t2b is the indoor heat exchanger temperature in cooling mode, which is the temperature at the middle of the indoor heat exchanger; and t2b_target is the first target temperature of the indoor heat exchanger in cooling mode.

[0037] In heating mode, if the indoor heat exchanger temperature is within the second target temperature range, the opening change ΔEXV is 0; if the indoor heat exchanger temperature is not within the second target temperature range, the opening change ΔEXV = (t2_target - t2)·e, where e is the opening correction coefficient; t2 is the indoor heat exchanger temperature in heating mode, which is the outlet temperature of the indoor heat exchanger; t2_target is the second target temperature of the indoor heat exchanger in heating mode.

[0038] In an optional technical solution of the present invention, the frequency change value acquisition module is configured as follows:

[0039] If the minimum opening degree ≤ the target opening degree ≤ the maximum opening degree, then control the temperature comparison module to run;

[0040] If the target opening degree is greater than the maximum opening degree, then the compressor frequency change value ΔRPS = (target opening degree - maximum opening degree) · μ;

[0041] If the target opening degree is less than the minimum opening degree, the compressor frequency change value ΔRPS = (target opening degree - minimum opening degree) · μ, where μ is the compressor frequency correction coefficient. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the structure of a multi-split air conditioning system according to an embodiment of the present invention.

[0043] Figure 2 This is a schematic flowchart illustrating the control method of the indoor unit's electronic expansion valve and compressor in an embodiment of the present invention.

[0044] Figure 3 This is a flowchart illustrating the control method for the indoor unit's electronic expansion valve and compressor.

[0045] Figure 4 This is a schematic diagram of the modular structure of the control device for the indoor electronic expansion valve and the compressor in an embodiment of the present invention.

[0046] Figure label:

[0047] 11. Compressor; 12. Four-way valve; 13. Throttling valve; 14. Outdoor heat exchanger; 15. Indoor heat exchanger; 151. Indoor unit electronic expansion valve; 16. Gas-liquid separator; 17. Oil separator; 18. Oil return capillary tube; 2. Detection module; 3. Temperature comparison module; 4. Opening change acquisition module; 5. Target opening acquisition module; 6. Opening comparison module; 7. Frequency change value acquisition module; 8. Compressor frequency adjustment module. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] like Figure 1 As shown, this invention provides a multi-split air conditioning system, including a compressor 11, a four-way valve 12, a throttle valve 13, an outdoor heat exchanger 14, multiple indoor heat exchangers 15 connected in parallel, a gas-liquid separator 16, etc. An outdoor fan is correspondingly installed on each outdoor heat exchanger 14, and an indoor unit electronic expansion valve 151 is connected in series with each indoor heat exchanger 15. Further, an oil separator 17 is provided between the compressor 11 and the D-port of the four-way valve 12, and an oil return capillary tube 18 is provided between the outlet of the oil separator 17 and the return port of the compressor 11; the four-way valve 12... A high-pressure sensor is installed between the D port of the four-way valve 12 and the oil separator 17; a low-pressure sensor is installed between the S port of the four-way valve 12 and the gas-liquid separator 16; a low-pressure shut-off valve is installed between the E port of the four-way valve 12 and the inlet of the indoor heat exchanger 15; a high-pressure shut-off valve is installed between the outlet of the indoor heat exchanger 15 and the throttle valve 13; and one-way valves are connected in parallel on both sides of the throttle valve 13. Temperature sensors / temperature bulbs are also included at the middle and outlet of the indoor heat exchanger to detect the temperature at the middle and outlet of the indoor heat exchanger 15. In some embodiments, the air conditioning system may not include the aforementioned gas-liquid separator 16, oil separator 17, oil return capillary tube 18, one-way valves, etc.

[0050] like Figure 2 As shown, the present invention provides a control method for an indoor unit electronic expansion valve and a compressor, which is applicable to the above-mentioned air conditioning system. The control method includes the following steps:

[0051] Testing steps: Real-time monitoring of the air conditioning system's operating mode, indoor heat exchanger temperature, indoor unit electronic expansion valve opening, and compressor 11's current frequency;

[0052] Temperature comparison steps: Compare the indoor heat exchanger temperature with the target temperature range (including the first target temperature range and the second target temperature range);

[0053] Steps for obtaining the opening change: Determine the opening change ΔEXV of the indoor unit's electronic expansion valve based on the operating mode and the comparison between the indoor heat exchanger temperature and the target temperature range;

[0054] Target opening degree acquisition steps: Calculate the target opening degree of the indoor unit's electronic expansion valve based on the sum of the current opening degree and the opening degree change ΔEXV. The opening degree change is related to the operating mode of the air conditioning system and the difference between the indoor heat exchanger temperature and the preset target temperature range.

[0055] Opening comparison steps: Compare the target opening with the preset maximum opening and the preset minimum opening;

[0056] Frequency change value acquisition steps: Determine the frequency change value of compressor 11 based on the comparison results between the target opening degree and the maximum opening degree and / or the minimum opening degree;

[0057] Compressor frequency adjustment steps: Calculate the target frequency of compressor 11 based on the sum of the frequency change value and the current frequency of compressor 11, and control compressor 11 to run at the target frequency.

[0058] Figure 2 The meanings of each letter in the code are as follows: maximum opening EXV_max, minimum opening EXV_min, current opening EXV_now, target opening EXV_target, current frequency RPS_now, target frequency RPS_target, and frequency change value △RPS.

[0059] According to this technical solution, the opening change and target opening are calculated by the difference between the indoor heat exchanger temperature and the target temperature. Based on the comparison between the target opening and the maximum and / or minimum opening (including cases where the opening of the electronic expansion valve exceeds the operating range), the frequency change and target frequency of the compressor 11 are adjusted, thereby regulating the air conditioning refrigerant flow. This improves the intelligence of the air conditioning system's control logic and the adaptability of the air conditioning system when the opening of the indoor unit's electronic expansion valve exceeds the operating range. Furthermore, operating at the new target frequency, the air conditioning system can meet user needs more quickly, enhance user experience, and simultaneously save energy.

[0060] In a preferred embodiment of the present invention, the method further includes: returning to the detection step after the compressor frequency adjustment step. Returning to the detection step after the frequency adjustment step enables real-time monitoring of the air conditioning system's operating status. When changes occur in the operating mode, indoor heat exchanger temperature, or compressor frequency, the opening of the indoor unit's electronic expansion valve and the current frequency of the compressor 11 are adjusted promptly to ensure the long-term stable operation of the air conditioning system.

[0061] In a preferred embodiment of the present invention, in the step of obtaining the opening change, determining the opening change ΔEXV of the indoor unit's electronic expansion valve based on the operating mode and the comparison between the indoor heat exchanger temperature and the target temperature range includes:

[0062] like Figure 3 As shown, in cooling mode, if the indoor heat exchanger temperature is within the first target temperature range (t2b_target-1≤t2b≤t2b_target+1), the opening change ΔEXV is 0; if the indoor heat exchanger temperature is not within the first target temperature range, the opening change ΔEXV = (t2b-t2b_target)·e, where e is the opening correction coefficient; t2b is the indoor heat exchanger temperature in cooling mode, which is the middle temperature of indoor heat exchanger 15; t2b_target is the first target temperature of indoor heat exchanger 15 in cooling mode.

[0063] In heating mode, if the indoor heat exchanger temperature is within the second target temperature range (t2_target-1≤t2≤t2_target+1), the opening change ΔEXV is 0; if the indoor heat exchanger temperature is not within the second target temperature range, the opening change ΔEXV = (t2_target-t2)·e, where e is the opening correction coefficient (in this embodiment, e>0); t2 is the indoor heat exchanger temperature in heating mode, which is the outlet temperature of the indoor heat exchanger 15; t2_target is the second target temperature of the indoor heat exchanger 15 in heating mode. It should be noted that technicians can adjust the first target temperature range, the second target temperature range, the first target temperature, and the second target temperature according to actual conditions, and are not limited to the examples given in this embodiment.

[0064] By employing the above method, the location where the indoor heat exchanger temperature is collected differs under different operating modes, which improves the accuracy of the indoor heat exchanger temperature readings. This, in turn, improves the accuracy of the calculation results for the opening change of the indoor unit's electronic expansion valve, thus providing accurate data for compressor frequency adjustment. Furthermore, in cooling mode, when the indoor heat exchanger temperature is within the first target temperature range, the opening change is 0, meaning no adjustment of the indoor unit's electronic expansion valve opening is performed. When the indoor heat exchanger temperature is not within the first target temperature range, the opening change is correlated with the difference between the first target temperature and the indoor heat exchanger temperature. The larger the difference, the larger the opening change, and the greater the adjustment range of the indoor unit's electronic expansion valve opening (t2 > t2_target + 1, opening change < 0, indoor unit electronic expansion valve opening decreases; t2 < t2_target - 1, opening change > 0, indoor unit electronic expansion valve opening increases). This helps the air conditioning system reach the required cooling state more quickly, improves user comfort, and reduces energy consumption. Similarly, in heating mode, the air conditioning system can reach the required heating state more quickly, improving user comfort and reducing energy consumption.

[0065] In a preferred embodiment of the present invention, in cooling mode, the lower limit of the first target temperature range is lower than the first target temperature, and the upper limit of the first target temperature range is higher than the first target temperature; and / or in heating mode, the lower limit of the second target temperature range is lower than the second target temperature, and the upper limit of the second target temperature range is higher than the second target temperature. In cooling or heating modes, corresponding to different target temperatures / target temperature ranges, the change value of the indoor unit's electronic expansion valve is determined based on the comparison between the indoor heat exchanger temperature and the target temperature. This improves the accuracy of obtaining the target opening degree of the indoor unit's electronic expansion valve, thereby improving the accuracy of the compressor's operating frequency in the entire control method, enhancing the user experience, and simultaneously enabling the air conditioning system to operate efficiently and energy-savingly.

[0066] In a preferred embodiment of the present invention, the opening correction coefficient ranges from 7 to 9, and preferably, the opening correction coefficient e = 8. Selecting a suitable opening correction coefficient can improve the accuracy of the opening control of the indoor unit's electronic expansion valve, making the opening of the indoor unit's electronic expansion valve compatible with the operation of the air conditioning system, thereby improving the operating energy efficiency of the air conditioning system.

[0067] In a preferred embodiment of the present invention, in the step of obtaining the frequency change value, determining the frequency change value of the compressor 11 based on the comparison result between the target opening degree and the maximum and minimum opening degrees includes:

[0068] If the minimum opening is less than or equal to the target opening and less than or equal to the maximum opening, then return to the temperature comparison step.

[0069] If the target opening degree is greater than the maximum opening degree, then the frequency change value of compressor 11, ΔRPS, is equal to (target opening degree - maximum opening degree)·μ.

[0070] If the target opening degree is less than the minimum opening degree, then the frequency change value of compressor 11 is ΔRPS = (target opening degree - minimum opening degree)·μ, where μ is the frequency correction coefficient of compressor 11.

[0071] In the above manner, when the target opening of the indoor unit's electronic expansion valve is between the minimum and maximum opening, the opening of the indoor unit's electronic expansion valve remains unchanged, and the process returns to the temperature comparison step to enter the next cycle. When the target opening is greater than the maximum opening or less than the minimum opening, that is, when the target opening of the indoor unit's electronic expansion valve exceeds its operating range, the frequency change value of the compressor 11 is calculated based on the product of the difference between the target opening and the maximum / minimum opening and the frequency correction coefficient. Combined with the current frequency of the compressor 11, the compressor 11 is controlled to operate at the target frequency to adjust the refrigerant flow of the air conditioning system, thereby adjusting the cooling capacity of the air conditioning system. Under the new operating parameters, the indoor heat exchanger temperature changes, and the opening of the indoor unit's electronic expansion valve tends to adjust towards the target opening direction, enabling the air conditioning system to meet user needs more quickly while also saving energy.

[0072] In a preferred embodiment of the present invention, the frequency correction coefficient μ ranges from 0.2 to 0.3, and preferably, μ = 0.25. Selecting a suitable frequency correction coefficient can improve the accuracy of the frequency control of the compressor 11 and ensure the efficient and stable operation of the air conditioning system.

[0073] like Figure 4 As shown, another aspect of the present invention provides a control device for the indoor unit electronic expansion valve and compressor of an air conditioning system, the control device comprising:

[0074] The detection module 2 is used to detect the operating mode of the air conditioning system, the temperature of the indoor heat exchanger, the opening degree of the indoor unit's electronic expansion valve, and the current frequency of the compressor 11 in real time.

[0075] Temperature comparison module 3 is used to compare the temperature of the indoor heat exchanger with the target temperature range;

[0076] The opening change acquisition module 4 is used to determine the opening change ΔEXV of the indoor unit's electronic expansion valve based on the operating mode and the comparison results between the indoor heat exchanger temperature and the target temperature range.

[0077] The target opening degree acquisition module 5 is used to calculate the target opening degree of the indoor unit electronic expansion valve based on the sum of the current opening degree and the opening degree change △EXV.

[0078] The opening comparison module 6 is used to compare the target opening with the preset maximum opening and the preset minimum opening.

[0079] The frequency change value acquisition module 7 is used to determine the frequency change value of compressor 11 based on the comparison results between the target opening degree and the maximum and minimum opening degrees.

[0080] The compressor frequency regulation module 8 is used to calculate the target frequency of the compressor 11 based on the sum of the frequency change value and the current frequency of the compressor 11, and to control the compressor 11 to operate at the target frequency.

[0081] Specifically, the detection module 2 includes a temperature sensor for detecting the temperature at the center of the indoor heat exchanger 15 and the outlet temperature of the indoor heat exchanger 15. The detection of the operating mode, compressor frequency, and electronic expansion valve opening can be performed using existing technology and will not be elaborated here. The temperature comparison module 3, opening change acquisition module 4, target opening acquisition module 5, opening comparison module 6, frequency change value acquisition module 7, and compressor frequency adjustment module 8 can all be integrated into the air conditioning system controller (not shown in the figure). The controller is communicatively connected to the compressor 11 and the indoor unit electronic expansion valve 151, controlling the adjustment of the compressor frequency and the opening of the indoor unit electronic expansion valve. The controller can also perform the above-mentioned temperature comparison, opening change value calculation, target opening calculation, opening comparison, frequency change value calculation, and target frequency calculation, as well as control the compressor 11 to operate at the target frequency. Furthermore, the control device also includes a storage module (not shown in the figure) for storing the above-mentioned logical judgment conditions and preset minimum opening, maximum opening, first target temperature, second target temperature, first target temperature range, and second target temperature range.

[0082] In a preferred embodiment of the present invention, the opening change acquisition module 4 is configured as follows: in cooling mode, if the indoor heat exchanger temperature is within the first target temperature range, the opening change ΔEXV is 0; if the indoor heat exchanger temperature is not within the first target temperature range, the opening change ΔEXV = (t2b - t2b_target)·e, where e is the opening correction coefficient; t2b is the indoor heat exchanger temperature in cooling mode, and the indoor heat exchanger temperature is the middle temperature of the indoor heat exchanger 15; t2b_target is the first target temperature of the indoor heat exchanger 15 in cooling mode.

[0083] In heating mode, if the indoor heat exchanger temperature is within the second target temperature range, the opening change ΔEXV is 0; if the indoor heat exchanger temperature is not within the second target temperature range, the opening change ΔEXV = (t2_target - t2)·e, where e is the opening correction coefficient; t2 is the indoor heat exchanger temperature in heating mode, which is the outlet temperature of indoor heat exchanger 15; t2_target is the second target temperature of indoor heat exchanger 15 in heating mode.

[0084] In a preferred embodiment of the present invention, the frequency change value acquisition module 7 is configured as follows:

[0085] If the minimum opening degree ≤ the target opening degree ≤ the maximum opening degree, then control the temperature comparison module 3 to run;

[0086] If the target opening degree is greater than the maximum opening degree, then the frequency change value of compressor 11, ΔRPS, is equal to (target opening degree - maximum opening degree)·μ.

[0087] If the target opening degree is less than the minimum opening degree, then the frequency change value of compressor 11 is ΔRPS = (target opening degree - minimum opening degree)·μ, where μ is the frequency correction coefficient of compressor 11.

[0088] The present invention also provides an air conditioning system, including the above-mentioned control device for the indoor unit electronic expansion valve and compressor, or the control method for performing the above-mentioned control of the indoor unit electronic expansion valve and compressor.

[0089] The present invention also provides a computer-readable storage medium, including a processor and a memory, wherein the memory stores a computer program, and when the computer program is executed by the processor, it performs the steps of the above-described control method for the indoor electronic expansion valve and the compressor.

[0090] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A control method for an indoor unit electronic expansion valve and a compressor in an air conditioning system, the air conditioning system comprising an indoor heat exchanger, a compressor, and an indoor unit electronic expansion valve connected in series with the indoor heat exchanger, characterized in that, The control method includes the following steps: Detection steps: Real-time detection of the air conditioning system's operating mode, indoor heat exchanger temperature, the opening degree of the indoor unit's electronic expansion valve, and the current frequency of the compressor; Target opening degree acquisition steps: Calculate the target opening degree of the indoor unit electronic expansion valve based on the sum of the current opening degree and the opening degree change ΔEXV. The opening degree change is related to the operating mode of the air conditioning system and the difference between the indoor heat exchanger temperature and the preset target temperature range. Opening comparison step: Compare the target opening with the preset maximum opening and the preset minimum opening; Frequency change value acquisition step: Determine the compressor frequency change value based on the comparison result between the target opening degree and the maximum opening degree and the minimum opening degree; Compressor frequency adjustment steps: Calculate the target frequency of the compressor based on the sum of the frequency change value and the current frequency of the compressor, and control the compressor to operate at the target frequency. Between the detection step and the target opening acquisition step, the following is also included: Temperature comparison step: Compare the temperature of the indoor heat exchanger with the preset target temperature range; Steps for obtaining the change in opening degree: In cooling mode, if the temperature of the indoor heat exchanger is within the first target temperature range, the change in opening degree ΔEXV is 0; if the temperature of the indoor heat exchanger is not within the first target temperature range, the change in opening degree ΔEXV = (t2b - t2b_target)·e, where e is the opening degree correction coefficient; t2b is the temperature of the indoor heat exchanger in cooling mode, which is the temperature at the middle of the indoor heat exchanger; t2b_target is the first target temperature of the indoor heat exchanger in cooling mode. In heating mode, if the indoor heat exchanger temperature is within the second target temperature range, the opening change ΔEXV is 0; if the indoor heat exchanger temperature is not within the second target temperature range, the opening change ΔEXV = (t2_target - t2)·e, where e is the opening correction coefficient; t2 is the indoor heat exchanger temperature in heating mode, which is the outlet temperature of the indoor heat exchanger; t2_target is the second target temperature of the indoor heat exchanger in heating mode.

2. The control method for the indoor unit electronic expansion valve and compressor of the air conditioning system according to claim 1, characterized in that, In cooling mode, the lower limit of the first target temperature range is lower than the first target temperature, and the upper limit of the first target temperature range is greater than the first target temperature; and / or in heating mode, the lower limit of the second target temperature range is lower than the second target temperature, and the upper limit of the second target temperature range is greater than the second target temperature.

3. The control method for the indoor unit electronic expansion valve and compressor of the air conditioning system according to claim 1, characterized in that, The value range of the opening correction coefficient is 7-9.

4. The control method for the indoor unit electronic expansion valve and compressor of the air conditioning system according to claim 1, characterized in that, In the step of obtaining the frequency change value, determining the compressor's frequency change value based on the comparison result between the target opening degree and the maximum opening degree and the minimum opening degree includes: If the minimum opening degree ≤ the target opening degree ≤ the maximum opening degree, then return to the temperature comparison step; If the target opening degree is greater than the maximum opening degree, then the frequency change value of the compressor ΔRPS = (target opening degree - maximum opening degree) · µ; If the target opening degree is less than the minimum opening degree, then the frequency change value of the compressor is ΔRPS = (target opening degree - minimum opening degree)·µ, where µ is the frequency correction coefficient of the compressor.

5. The control method for the indoor unit electronic expansion valve and compressor of the air conditioning system according to claim 4, characterized in that, The frequency correction coefficient has a value range of 0.2-0.

3.

6. The control method for the indoor unit electronic expansion valve and compressor of the air conditioning system according to claim 1, characterized in that, Also includes: After the compressor frequency adjustment step, return to the detection step.

7. A control device for an indoor unit electronic expansion valve and a compressor of an air conditioning system, the air conditioning system comprising an indoor heat exchanger, a compressor, and an indoor unit electronic expansion valve connected in series with the indoor heat exchanger, characterized in that, The control device includes: The detection module is used to detect in real time the operating mode of the air conditioning system, the temperature of the indoor heat exchanger, the opening degree of the indoor unit's electronic expansion valve, and the current frequency of the compressor. The target opening degree acquisition module is used to calculate the target opening degree of the indoor unit electronic expansion valve based on the sum of the current opening degree and the opening degree change ΔEXV. The opening degree change is related to the operating mode of the air conditioning system and the difference between the indoor heat exchanger temperature and the preset target temperature range. An opening comparison module is used to compare the target opening with a preset maximum opening and a preset minimum opening. The frequency change value acquisition module is used to determine the frequency change value of the compressor based on the comparison result between the target opening degree and the maximum opening degree and the minimum opening degree; The compressor frequency regulation module is used to calculate the target frequency of the compressor based on the sum of the frequency change value and the current frequency of the compressor, and control the compressor to operate at the target frequency; The temperature comparison module is used to compare the temperature of the indoor heat exchanger with a preset target temperature range; The opening change acquisition module is configured as follows: In cooling mode, if the indoor heat exchanger temperature is within the first target temperature range, the opening change ΔEXV is 0; if the indoor heat exchanger temperature is not within the first target temperature range, the opening change ΔEXV = (t2b - t2b_target)·e, where e is the opening correction coefficient; t2b is the indoor heat exchanger temperature in cooling mode, which is the middle temperature of the indoor heat exchanger; t2b_target is the first target temperature of the indoor heat exchanger in cooling mode. In heating mode, if the indoor heat exchanger temperature is within the second target temperature range, the opening change ΔEXV is 0; if the indoor heat exchanger temperature is not within the second target temperature range, the opening change ΔEXV = (t2_target - t2)·e, where e is the opening correction coefficient; t2 is the indoor heat exchanger temperature in heating mode, which is the outlet temperature of the indoor heat exchanger; t2_target is the second target temperature of the indoor heat exchanger in heating mode.

8. The control device for the indoor unit electronic expansion valve and compressor of the air conditioning system according to claim 7, characterized in that, The frequency change value acquisition module is configured as follows: If the minimum opening degree ≤ the target opening degree ≤ the maximum opening degree, then control the temperature comparison module to operate; If the target opening degree is greater than the maximum opening degree, then the frequency change value of the compressor ΔRPS = (target opening degree - maximum opening degree) · µ; If the target opening degree is less than the minimum opening degree, then the frequency change value of the compressor is ΔRPS = (target opening degree - minimum opening degree)·µ, where µ is the frequency correction coefficient of the compressor.

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