Air conditioning system and control method thereof

Abstract

The invention relates to the technical field of air conditioners, particularly provides an air conditioning system and a control method thereof, and aims at solving the problem that high-low pressure fluctuation is large in the refrigeration mode starting stage of an existing air conditioning system. In order to achieve the purpose, the control method comprises the following steps that when a refrigeration mode is started, the current frequency of a compressor and the current opening degree of an expansion valve are determined according to the target frequency of the compressor, the target opening degree of the expansion valve, the indoor temperature and the outdoor temperature; the frequency of a compressor is controlled to be m * a1, and the opening degree of an expansion valve is controlled to be n * b1; wherein a1 is the target frequency; b1 is the target opening degree. According to the indoor temperature and the outdoor temperature, the values of m and n are determined, the frequency of the compressor and the opening degree of the expansion valve during starting are adjusted to be matched and coordinated, the problem that the frequency of the compressor and the opening degree of the expansion valve fluctuate repeatedly at the beginning of starting can be avoided, and then the problem that high pressure and low pressure of an air conditioning system change drastically at the beginning of starting is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and specifically provides an air conditioning system and a control method thereof. Background Art

[0002] Air conditioners have become an indispensable household appliance. When the indoor unit of the air conditioner is in the refrigeration startup phase, the compressor starts at a fixed frequency, and the electronic expansion valve runs at a reference opening to ensure system stability. This control method will cause the system to start after the end of the startup. Due to the incoordination between the frequency of the compressor and the opening of the electronic expansion valve at the initial startup, in order to match the two, the compressor frequency and the opening of the electronic expansion valve will fluctuate repeatedly, and the high and low pressures of the air conditioning system will change dramatically. After a period of time, the compressor, electronic expansion valve and other key components can be controlled to the verified parameter values according to the indoor and outdoor ambient temperatures. This control will cause the startup phase to take too long to stabilize, and the user experience is poor.

[0003] Therefore, the relevant field is in urgent need of an air-conditioning system and a control method thereof to solve the above technical problems. Summary of the invention

[0004] The present invention aims to solve the above technical problem, that is, to solve the problem of large fluctuations in high and low pressures during the startup phase of the refrigeration mode of the existing air-conditioning system.

[0005] In a first aspect, the present invention provides a control method for an air conditioning system, the control method comprising the following steps:

[0006] When the cooling mode is started, the current frequency of the compressor and the current opening of the expansion valve are determined according to the target frequency of the compressor, the target opening of the expansion valve, the indoor temperature and the outdoor temperature.

[0007] In a specific implementation of the control method of the air conditioning system, the frequency of the compressor is controlled to be m*a1, and the opening of the expansion valve is controlled to be n*b1;

[0008] Wherein, a1 is the target frequency; b1 is the target opening; and the values of m and n are determined according to the indoor temperature and the outdoor temperature.

[0009] In a specific implementation of the control method for the air-conditioning system, the values of m and n are both greater than 0.5 and less than 1.5; the values of m and n have opposite trends.

[0010] In a specific implementation of the control method of the above air-conditioning system, when m is greater than 1, n is less than 1; when m is less than 1, n is greater than 1.

[0011] In a specific implementation of the control method of the air conditioning system, as the indoor temperature increases, the value of m gradually increases; and / or

[0012] As the outdoor temperature increases, the value of m gradually increases.

[0013] In the specific implementation of the control method of the above air-conditioning system, as the outdoor temperature increases, the value of n gradually decreases; and / or

[0014] As the outdoor temperature increases, the value of n gradually decreases.

[0015] In the specific implementation of the control method of the above air-conditioning system, when the change values of the indoor temperature and the outdoor temperature are both less than the first preset value and last for the first preset duration, the frequency of the compressor is adjusted to a1; the opening degree of the expansion valve is adjusted to b1.

[0016] In the specific implementation of the control method of the above air-conditioning system, when the change values of the indoor temperature and the outdoor temperature are both less than the second preset value and last for the second preset duration, the values of m and n are adjusted to be closer to 1.

[0017] In the specific implementation of the control method of the above air-conditioning system, "adjusting the values of m and n to be closer to 1" includes:

[0018] Determining the adjusted value of m according to the current frequency of the compressor, the target frequency, and the current value of m.

[0019] In the specific implementation of the control method of the above air-conditioning system, "determining the adjusted value of m according to the current frequency a2 of the compressor, the target frequency, and the current value of m" includes:

[0020] The adjusted m = the current m multiplied by (the current frequency a2 / the target frequency a1).

[0021] In the specific implementation of the control method of the above air-conditioning system, "adjusting the values of m and n to be closer to 1" includes:

[0022] Determining the adjusted value of n according to the current opening degree of the expansion valve, the target opening degree, and the current value of n. In the specific implementation of the control method of the above air-conditioning system, "determining the adjusted value of n according to the current opening degree of the expansion valve, the target opening degree, and the current value of n" includes:

[0023] The adjusted n = the current n multiplied by (the current opening degree b2 / the target opening degree b1).

[0024] In the specific implementation of the control method of the above air-conditioning system, after adjusting m and n, when the change values of the indoor temperature and the outdoor temperature are less than the third preset value and last for the third preset duration, the frequency of the compressor is adjusted to a1; the opening degree of the expansion valve is adjusted to b1.

[0025] In a second aspect, the present invention provides an air-conditioning system, which includes a control module configured to be capable of executing the control method of the air-conditioning system as described above.

[0026] In the case of adopting the above technical solution, the control method of the air-conditioning system of the present invention includes the following steps: When the refrigeration mode is started, according to the target frequency of the compressor, the target opening of the expansion valve, the indoor temperature, and the outdoor temperature, determine the current frequency of the compressor and the current opening of the expansion valve. Control the frequency of the compressor to be m*a1, and the opening of the expansion valve to be n*b1; where a1 is the target frequency; b1 is the target opening. According to the indoor temperature and the outdoor temperature, determine the values of m and n, and adjust the compressor frequency and the expansion valve opening at startup to make them match and coordinate, which can avoid the problem of repeated fluctuations in the compressor frequency and the expansion valve opening at the beginning of startup, and further avoid the problem of drastic changes in the high and low pressures of the air-conditioning system at the beginning of startup.

[0027] In addition, the values of m and n are adjusted following the indoor and outdoor temperatures, which can make it applicable to various working conditions, and can ensure that the air-conditioning system can smoothly pass through the startup stage of the refrigeration mode under various working conditions, avoiding the problem of drastic changes in high and low pressures. Description of the Drawings

[0028] The following describes the preferred embodiments of the present invention with reference to the drawings. In the drawings:

[0029] Figure 1 is a flowchart of the control method of the air-conditioning system provided by the present invention. Detailed Embodiments

[0030] The following describes the preferred embodiments of the present invention with reference to the drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present invention and are not intended to limit the protection scope of the present invention.

[0031] It should be noted that in the description of the present invention, the terms indicating directions or positional relationships such as "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0032] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and defined, the terms "installation", "setting", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, indirectly connected through an intermediate medium, or the interior of two components can be in communication. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] To solve the problem of large fluctuations in high and low pressures during the startup phase of the cooling mode of the existing air-conditioning system. The present invention provides an air-conditioning system, which includes a compressor, an indoor heat exchanger, an outdoor heat exchanger, an expansion valve, a control module, etc. This air-conditioning system can achieve a cooling mode, a heating mode, and a defrosting mode. Moreover, the control module is configured to execute the control method of this air-conditioning system. Among them, the expansion valve is specifically an electronic expansion valve, and its opening degree can be controlled through the control module of the air-conditioning system. This air-conditioning system also includes an outdoor temperature sensor and an indoor temperature sensor. The indoor temperature sensor is used to detect the indoor temperature and transmit this to the control module so that the control module can execute the control method. The outdoor temperature sensor is used to detect the outdoor temperature and transmit this to the control module so that the control module can execute the control method. The control module can also detect and determine the operating frequency of the compressor and the opening degree of the expansion valve.

[0034] The control method of this air-conditioning system will be described below with two embodiments.

[0035] Embodiment 1

[0036] As Figure 1 shown, this embodiment discloses a control method of an air-conditioning system, and this control method includes the following steps:

[0037] S1. When the air-conditioning system wants to start in the cooling mode, obtain the target frequency of the compressor, the target opening degree of the expansion valve, the indoor temperature, and the outdoor temperature;

[0038] S2. According to the target frequency, the target opening degree, the indoor temperature, and the outdoor temperature, determine the current frequency of the compressor and the current opening degree of the expansion valve; the air conditioner starts in the cooling mode with the current frequency and the current opening degree.

[0039] Specifically, control the frequency of the compressor to be m*a1, and the opening degree of the expansion valve to be n*b1; where a1 is the target frequency; b1 is the target opening degree. The target frequency is the operating frequency of the compressor in the nominal cooling mode of the air-conditioning system; the target opening degree refers to the opening degree of the expansion valve in the nominal cooling mode of the air-conditioning system;

[0040] Determine the values of m and n according to the indoor temperature and the outdoor temperature. The values of m and n are both greater than 0.5 and less than 1.5. Specifically, both m and n are greater than 0.7 and less than 1.3. That is, fine-tuning the air-conditioning system will not cause too much change in the operating frequency of the compressor, nor will it cause too much change in the opening degree of the expansion valve, which better ensures the stability of the operation of the air-conditioning system and avoids oscillation during the operation of the air-conditioning system. Moreover, the value trends of m and n are opposite, that is, they are in an inverse relationship. Specifically, when m is greater than 1, n is less than 1; when m is less than 1, n is greater than 1. In addition, the value trends of m and n are opposite. Moreover, at the same outdoor temperature, the lower the indoor temperature, the smaller the value of m; the greater the value of n. At the same indoor temperature, the higher the outdoor temperature, the greater the value of m, and the smaller the value of n.

[0041] In this embodiment, the values of m and n are referred to the following table.

[0042] The value range of m is shown in Table 1

[0043] Table 1

[0044] The value range of n is shown in Table 2

[0045] Table 2

[0046] Among them, the value of m is related to the outdoor temperature. The higher the outdoor temperature, the greater the value of m. Increasing the value of m can increase the refrigeration capacity of the air-conditioning system. The value of n is related to the indoor temperature. The higher the indoor temperature, the smaller the value of n. Decreasing the value of n can increase the refrigeration capacity of the air-conditioning system

[0047] Taking the outdoor temperature and the indoor temperature both being 28°C as an example, m is 0.9 and n is 1.1. Reducing the frequency of the compressor and increasing the opening degree of the expansion valve can reduce the refrigeration capacity of the air-conditioning system. Since it is in the refrigeration mode and the purpose is to lower the indoor temperature, that is, the indoor target temperature is lower than the current indoor temperature. When the indoor and outdoor temperatures are both 28°C, the target temperature is generally 20 - 25°C, which is relatively close to the target temperature. It is only necessary to make the value of m less than 1, and the required refrigeration capacity is also small. Therefore, it is only necessary to increase the opening degree of the expansion valve, that is, it can be selected as 1.1. After adjustment, the compressor frequency is reduced and the opening degree of the expansion valve is increased, making the two coordinate with each other and avoiding the drastic change of high and low pressure when the air-conditioning system starts.

[0048] Taking the outdoor temperature and the indoor temperature both being 35°C as an example for illustration; where m is 1.1 and n is 0.95; increasing the frequency of the compressor and decreasing the opening degree of the expansion valve can increase the refrigeration capacity of the air-conditioning system and enable the indoor temperature to drop rapidly. When the indoor and outdoor temperatures are both 35°C, the target temperature is generally 20 - 25°C. The difference from the target temperature is large, and the temperatures are both high, requiring a large refrigeration capacity. The value of m needs to be greater than 1. Therefore, the opening degree of the expansion valve needs to be decreased, that is, the selected value of n should be less than 1.1. After adjustment, the compressor frequency increases and the expansion valve decreases, making the two coordinate with each other and avoiding drastic high and low pressure changes when the air-conditioning system starts.

[0049] The specific values of m and n can be determined through actual machine experiments, or by establishing a digital model of the air-conditioning system and conducting data simulation experiments through the digital model.

[0050] Regarding the values of m and n, it should be noted that although the data in the above table is used in this embodiment, this is not a limitation of the present invention. Without departing from the principle of the present invention, in other embodiments, those skilled in the art can also adjust and determine according to the air-conditioning system model, the maximum rated power of the compressor, the maximum rated power of the indoor unit, and the maximum rated power of the outdoor unit. This does not depart from the basic principle of the present invention and will fall within the protection scope of the present invention.

[0051] When the change values of the indoor temperature and the outdoor temperature are both less than the first preset value and last for the first preset duration, the frequency of the compressor is adjusted to the target frequency a1; the opening degree of the expansion valve is adjusted to the target opening degree b1. Where the first preset value is 0.3°C and the first preset duration is 10 min; that is, within the continuous duration of the first preset duration, if the change values of the indoor temperature and the outdoor temperature are always less than 0.3°C, it is determined that the indoor temperature has tended to be stable; and it has tended to the nominal refrigeration mode. Adjusting the frequency of the compressor to the target frequency and the opening degree of the expansion valve to the target opening degree can enable the air-conditioning system to continue to operate stably.

[0052] Regarding the first preset value and the first preset duration, it should be noted that although the first preset value is 0.3°C and the first preset duration is 10 min in this embodiment, this is not a limitation of the present invention. Without departing from the principle of the present invention, in other embodiments, the first preset value can also be 0.2°C or 0.5°C, and the first preset duration can be 8 min or 15 min. This does not depart from the basic principle of the present invention and will fall within the protection scope of the present invention.

[0053] Embodiment 2

[0054] Such as Figure 1As shown, this embodiment discloses a control method for an air conditioning system, which includes the following steps:

[0055] S1. When the air conditioning system wants to start in the cooling mode, obtain the target frequency of the compressor, the target opening of the expansion valve, the indoor temperature, and the outdoor temperature.

[0056] S2. Determine the current frequency of the compressor and the current opening of the expansion valve according to the target frequency, the target opening, the indoor temperature, and the outdoor temperature; the air conditioner starts in the cooling mode at the current frequency and the current opening.

[0057] Specifically, control the frequency of the compressor to be m*a1, and the opening of the expansion valve to be n*b1; where a1 is the target frequency; b1 is the target opening. The target frequency is the operating frequency of the compressor in the nominal cooling mode of the air conditioning system; the target opening refers to the opening of the expansion valve in the nominal cooling mode of the air conditioning system; the expansion valve is specifically an electronic expansion valve, and its opening can be controlled by the control module of the air conditioning system.

[0058] Determine the values of m and n according to the indoor temperature and the outdoor temperature. The values of m and n are both greater than 0.5 and less than 1.5; specifically, both m and n are greater than 0.7 and less than 1.3; that is, fine-tune the air conditioning system, which will not cause too much change in the operating frequency of the compressor, nor will it cause too much change in the opening of the expansion valve, better ensuring the stability of the operation of the air conditioning system; avoiding oscillation during the operation of the air conditioning system. Moreover, the value trends of m and n are opposite, that is, they are inversely proportional to each other. Specifically, when m is greater than 1, n is less than 1; when m is less than 1, n is greater than 1. In addition, the value trends of m and n are opposite. Moreover, at the same outdoor temperature, the lower the indoor temperature, the smaller the value of m; the larger the value of n. At the same indoor temperature, the higher the outdoor temperature, the larger the value of m, and the smaller the value of n.

[0059] In this embodiment, the values of m and n are referred to the following table.

[0060] Among them, the value range of m is shown in Table 3

[0061] Table 3

[0062] Among them, the value range of n is shown in Table 4

[0063] Table 4

[0064] Among them, the values of m and n can be specifically determined through actual machine experiments, or can be determined by establishing a digital model of the air conditioning system and conducting data simulation experiments through the digital model.

[0065] Regarding the values of m and n, it should be noted that although the data in the above table is adopted in this embodiment, this does not limit the present invention. Without departing from the principle of the present invention, in other embodiments, those skilled in the art can also adjust and determine according to the air-conditioning system model, the maximum rated power of the compressor, the maximum rated power of the indoor unit, and the maximum rated power of the outdoor unit, which do not deviate from the basic principle of the present invention and will fall within the protection scope of the present invention.

[0066] When the change value of the indoor temperature is less than the second preset value and lasts for the second preset duration, adjust the values of m and n to make them closer to 1; and adjust the operating frequency of the compressor and the opening degree of the expansion valve according to the new m and n. The second preset value is preferably 0.3°C and the second preset duration is preferably 10 min in this embodiment; in this case, it means that the air-conditioning system tends to be stable. In order to make the air-conditioning system more stable, adjust m and n to be closer to 1, that is, make the operating frequency of the compressor closer to the target frequency and the opening degree of the expansion valve closer to the target opening degree, which can make the air-conditioning system operate closer to the target refrigeration mode and make the air-conditioning system more stable. Then, after running for a period of time, adjust it to the target refrigeration mode, that is, adjust the frequency of the compressor to the target frequency and the opening degree of the expansion valve to the target opening degree, which can make the air-conditioning system pass through the startup stage more smoothly and avoid the fluctuation of high and low pressures.

[0067] Regarding the second preset value and the second preset duration, it should be noted that although the second preset value is 0.3°C and the second preset duration is 10 min in this embodiment, this does not limit the present invention. Without departing from the principle of the present invention, in other embodiments, the second preset value can also be 0.2°C or 0.5°C, and the second preset duration can be 8 min or 15 min, which do not deviate from the basic principle of the present invention and will fall within the protection scope of the present invention.

[0068] Among them, "adjust the values of m and n to make them closer to 1" includes:

[0069] Determine the adjusted m value according to the current frequency of the compressor, the target frequency, and the current m value.

[0070] "Determine the adjusted m value according to the current frequency a2 of the compressor, the target frequency, and the current m value" includes:

[0071] The adjusted m = the current m multiplied by (the current frequency a2 / the target frequency a1). That is, m = m * a2 / a1. The target frequency is the value that the compressor needs to run to. During the operation of the air conditioner, the current frequency of the compressor will approach the target frequency. When m > 1, the current frequency will be greater than the target frequency, and as the air conditioner system operates, the frequency of the compressor will gradually approach the target frequency, that is, gradually decrease. That is, when m > 1, the ratio of the current frequency to the target frequency, which is a2 / a1, is less than 1, but a1 / a2 will be greater than the initial m value; the adjusted m will decrease, but will still be greater than 1; it can ensure that the compressor frequency is closer to the target frequency after adjustment. When m < 1, the current frequency will be lower than the target frequency, and as the air conditioner system operates, the frequency of the compressor will gradually approach the target frequency, that is, gradually increase. That is, when m < 1, the ratio of the current frequency to the target frequency, which is a2 / a1, is greater than 1, but a1 / a2 will be greater than the initial m value; the adjusted m will increase, but will still be less than 1; it can ensure that the compressor frequency is closer to the target frequency after adjustment.

[0072] Among them, "adjusting the values of m and n to make them closer to 1" also includes:

[0073] Determine the adjusted n value according to the current opening degree, the target opening degree of the expansion valve, and the current n value.

[0074] "Determine the adjusted n value according to the current opening degree, the target opening degree of the expansion valve, and the current n value" includes:

[0075] The adjusted n = the current n multiplied by (the current opening degree b2 / the target opening degree b1). That is, n = n * b2 / b1. The target opening degree is the value that the expansion valve needs to run to. During the operation of the air conditioner, the current opening degree of the expansion valve will approach the target opening degree. When n > 1, the current opening degree will be greater than the target opening degree, and as the air conditioner system operates, the opening degree of the expansion valve will gradually approach the target opening degree, that is, gradually decrease. That is, when n > 1, the ratio of the current opening degree to the target opening degree, which is b2 / b1, is less than 1, but b1 / b2 will be greater than the initial n value; the adjusted n will decrease, but will still be greater than 1; it can ensure that the opening degree of the expansion valve is closer to the target opening degree after adjustment. When n < 1, the current opening degree will be lower than the target opening degree, and as the air conditioner system operates, the opening degree of the expansion valve will gradually approach the target opening degree, that is, gradually increase. That is, when n < 1, the ratio of the current opening degree to the target opening degree, which is b2 / b1, is greater than 1, but b1 / b2 will be greater than the initial n value; the adjusted n will increase, but will still be less than 1; it can ensure that the opening degree of the expansion valve is closer to the target opening degree after adjustment.

[0076] After adjusting m and n, when the change values of the indoor temperature and the outdoor temperature are less than a third preset value and last for a third preset duration, the frequency of the compressor is adjusted to a1; the opening degree of the expansion valve is adjusted to b1.

[0077] The third preset value is 0.3°C and the third preset duration is 10 min; that is, within the duration of the third preset duration, if the change values of the indoor temperature and the outdoor temperature are both less than 0.3°C all the time, it is determined that the indoor temperature has tended to be stable; and it has tended to the nominal refrigeration mode. Adjusting the frequency of the compressor to the target frequency and the opening degree of the expansion valve to the target opening degree can enable the air-conditioning system to continue to operate stably.

[0078] Regarding the third preset value and the third preset duration, it should be noted that although the third preset value is 0.3°C and the third preset duration is 10 min in this embodiment, this is not a limitation on the present invention. Without departing from the principle of the present invention, in other embodiments, the third preset value can also be 0.2°C or 0.5°C, and the third preset duration can be 8 min or 15 min. These do not deviate from the basic principle of the present invention and will fall within the protection scope of the present invention.

[0079] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of the present invention.

Claims

1. A control method for an air conditioning system, characterized in that, It includes the following steps: When the refrigeration mode is started, determine the current frequency of the compressor and the current opening degree of the expansion valve according to the target frequency of the compressor, the target opening degree of the expansion valve, the indoor temperature, and the outdoor temperature.

2. The control method of the air conditioning system according to claim 1, characterized in that, Control the frequency of the compressor to be m*a1, and control the opening degree of the expansion valve to be n*b1; Where a1 is the target frequency; b1 is the target opening degree; determine the values of m and n according to the indoor temperature and the outdoor temperature.

3. The control method of the air-conditioning system according to claim 2, characterized in that, The values of both m and n are greater than 0.5 and less than 1.5; the trends of the values of m and n are opposite.

4. The control method of the air conditioning system according to claim 3, characterized in that, When m is greater than 1, n is less than 1; when m is less than 1, n is greater than 1.

5. The control method of the air conditioning system according to claim 3, characterized in that, As the indoor temperature increases, the value of m gradually increases; and / or As the outdoor temperature increases, the value of m gradually increases.

6. The control method of the air conditioning system according to claim 3, wherein As the outdoor temperature increases, the value of n gradually decreases; and / or As the outdoor temperature increases, the value of n gradually decreases.

7. The control method of the air-conditioning system according to claim 2, wherein When the change values of both the indoor temperature and the outdoor temperature are less than the first preset value and last for the first preset duration, then adjust the frequency of the compressor to a1; adjust the opening degree of the expansion valve to b1.

8. The control method of the air conditioning system according to claim 2, characterized in that, When the change values of both the indoor temperature and the outdoor temperature are less than the second preset value and last for the second preset duration, adjust the values of m and n to be closer to 1.

9. The control method of the air conditioning system according to claim 8, characterized in that, "Adjust the values of m and n to be closer to 1" includes: Determine the adjusted value of m according to the current frequency of the compressor, the target frequency, and the current value of m.

10. The control method of the air conditioning system according to claim 9, wherein, "Determine the adjusted value of m according to the current frequency a2 of the compressor, the target frequency, and the current value of m" includes: The adjusted m = the current m multiplied by (the current frequency a2 / the target frequency a1).

11. The control method of the air conditioning system according to claim 8, characterized in that, "Adjust the values of m and n to be closer to 1" includes: Determine the adjusted value of n according to the current opening degree of the expansion valve, the target opening degree, and the current value of n.

12. The control method of the air conditioning system according to claim 11, characterized in that, "Determine the adjusted value of n according to the current opening degree of the expansion valve, the target opening degree, and the current value of n" includes: The adjusted n = the current n multiplied by (the current opening degree b2 / the target opening degree b1).

13. The control method of the air conditioning system according to claim 8, characterized in that, After adjusting m and n, when the change values of the indoor temperature and the outdoor temperature are less than the third preset value and last for the third preset duration, then adjust the frequency of the compressor to a1; adjust the opening degree of the expansion valve to b1.

14. An air conditioning system, characterized in that, It includes a control module, and the control module is configured to be capable of executing the control method of the air conditioning system as described in any one of claims 1-13.

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