Air conditioning system control method, device and air conditioning system

Abstract

The present invention discloses a control method, device and air-conditioning system. The method includes: after the air-conditioning system is started, obtaining the outer ring temperature and the compressor target frequency to determine the target speed of the external fan; judging whether the compressor target frequency is in the beat frequency interval corresponding to the target speed of the external fan; if so, looping through the following steps: S11, adjusting the compressor target frequency so that the adjusted compressor target frequency avoids the beat frequency interval, and determining a new target speed of the external fan based on the adjusted compressor target frequency and the outer ring temperature, and the time interval between the above two adjustment actions must meet the set conditions; S12, judging whether the adjusted compressor target frequency is in the beat frequency interval corresponding to the new target speed of the external fan; if so, going to step S11, if not, exiting the loop. The present invention reduces the fluctuation of the compressor frequency and the external fan speed while reducing the beat frequency sound and achieving the best system matching while synchronously adjusting the compressor frequency and the external fan speed.

Description

Technical Field

[0001] The present invention relates to the field of air conditioning, and in particular to a control method and device for an air conditioning system, and an air conditioning system. Background Art

[0002] Beat frequency noise is a fluctuating noise caused by the superposition of two sounds of similar but different frequencies, each with a small difference in loudness. In variable-frequency air conditioner outdoor units, the compressor frequency may be near double the harmonic frequency of the fan speed. At this point, the beat frequency noise is noticeable, affecting the user experience. It can also cause resonance in the air conditioner, impacting product reliability.

[0003] Existing solutions all unilaterally adjust the compressor frequency or the external fan speed to avoid beat noise and resonance, but cannot achieve the optimal system capacity and energy efficiency. Summary of the Invention

[0004] In view of this, the present invention discloses a control method and device for an air-conditioning system, and an air-conditioning system, so as to solve the problem of avoiding beat sound and resonance while achieving optimal system matching.

[0005] In order to achieve the above-mentioned objectives, the present invention adopts the following technical solutions:

[0006] A first aspect of the present invention discloses a method for controlling an air conditioning system, the method comprising:

[0007] After the air conditioning system is started, the outdoor ambient temperature and compressor target frequency are obtained;

[0008] Determine the target speed of the outdoor fan according to the outdoor ambient temperature and the target frequency of the compressor;

[0009] Determine whether the compressor target frequency is within the beat frequency range corresponding to the external fan target speed;

[0010] If so, loop through the following steps:

[0011] S11, adjusting the compressor target frequency so that the adjusted compressor target frequency avoids the beat frequency interval, and determining a new outdoor fan target speed based on the adjusted compressor target frequency and the outdoor ambient temperature, and the time interval between the above two adjustment actions must meet the set conditions;

[0012] S12, determine whether the adjusted compressor target frequency is within the beat frequency range corresponding to the new external fan target speed; if so, go to step S11, if not, exit the loop.

[0013] Further optionally, determining the target speed of the outdoor fan according to the outdoor ambient temperature and the target frequency of the compressor includes:

[0014] The target speed of the external fan corresponding to the outdoor ambient temperature and the target frequency of the compressor is determined by utilizing the corresponding relationship between the external ring temperature, the target frequency of the compressor and the target speed of the external fan.

[0015] Further optionally, step S11 includes:

[0016] Adjust the compressor target frequency to avoid the resonance target frequency, and record the number of resonance frequency avoidance processes;

[0017] monitoring the operating frequency of the compressor, and when the operating frequency of the compressor reaches a target frequency for avoiding resonance, controlling the compressor to operate at the target frequency for avoiding resonance, and recording the operating time of the compressor at the target frequency for avoiding resonance;

[0018] Determine whether the number of resonance frequency avoidance processing times and the operating time meet the set conditions;

[0019] If so, a new target speed of the outdoor fan is determined based on the outdoor ambient temperature and the target frequency to avoid resonance.

[0020] Further optionally, when monitoring the operating frequency of the compressor, the method further includes:

[0021] When the operating frequency of the compressor reaches the beat frequency range, the speed at which the compressor increases or decreases frequency is increased.

[0022] Further optionally, determining whether the number of resonance frequency avoidance processing times and the operating time meet set conditions includes:

[0023] Comparing the number of resonance frequency avoidance processes with the set number of processes, and comparing the operating time with the set time;

[0024] When the number of resonance frequency avoidance processes is less than the set number and the operation time reaches the set time, the set conditions are considered to be met.

[0025] Further optionally, the method further includes: exiting the loop when the number of resonance frequency avoidance processes is greater than or equal to a set number of times.

[0026] Further optionally, after exiting the loop, the method further includes:

[0027] Clears the number of times the resonance frequency is avoided.

[0028] Further optionally, the beat frequency interval is (F2, F3);

[0029] Where F2 = F 共振基频 -A, F3=F 共振基频 +A, 2≤A≤4;

[0030] F 共振基频=2×[(n×N) / 60], where n represents the target speed of the external fan, and N represents the number of blades of the external fan.

[0031] Further optionally, the adjusted compressor target frequency is greater than or equal to F3.

[0032] A second aspect of the present invention discloses a method for controlling an air conditioning system, the method comprising:

[0033] After the air conditioning system is started, the outdoor ambient temperature and compressor target frequency are obtained;

[0034] Determine the target speed of the outdoor fan according to the outdoor ambient temperature and the target frequency of the compressor;

[0035] Determine whether the compressor target frequency is within the beat frequency range corresponding to the external fan target speed;

[0036] If so, loop through the following steps:

[0037] S21, adjusting the target speed of the outdoor fan to change the beat frequency range so that the compressor target frequency is not within the adjusted beat frequency range, correcting the compressor target frequency to the optimal target frequency, and determining a new target speed of the outdoor fan based on the optimal target frequency and the outdoor ambient temperature. The time interval between the two actions of adjusting the target speed of the outdoor fan must meet the set conditions;

[0038] S22, determine whether the optimal target frequency is within the beat frequency range corresponding to the new target speed of the external fan; if so, go to step S21, if not, exit the loop.

[0039] Further optionally, step S21 includes:

[0040] Adjust the target speed of the external fan to avoid the resonance target speed, and record the number of resonance speed avoidance treatments;

[0041] Monitor the operating speed of the external fan, and when the operating speed of the external fan reaches the target speed for avoiding resonance, control the external fan to operate at the target speed for avoiding resonance, and record the operating time of the external fan at the target speed for avoiding resonance;

[0042] Determine whether the number of resonance speed avoidance processing times and the operating time meet the set conditions;

[0043] If so, determine a new target speed of the outdoor fan according to the outdoor ambient temperature and the optimal target frequency.

[0044] Further optionally, determining whether the number of resonance speed avoidance processing times and the operating time satisfy a set condition includes:

[0045] Compare the number of resonance speed avoidance processes with the set number, and compare the operating time with the set time;

[0046] When the number of resonance speed avoidance processes is less than the set number and the operating time reaches the set time, the set conditions are considered to be met.

[0047] Further optionally, the method further includes: exiting the loop when the number of resonance speed avoidance processes is greater than or equal to a set number.

[0048] Further optionally, after exiting the loop, the method further includes: clearing the number of resonance speed avoidance processing times;

[0049] The beat frequency range is greater than or equal to F2 and less than or equal to F3;

[0050] Where F2 = F 共振基频 -A, F3=F 共振基频 +A, 2≤A≤4;

[0051] F 共振基频 =2×[(n×N) / 60], where n represents the target speed of the external fan, and N represents the number of blades of the external fan.

[0052] The third aspect of the present invention discloses a control device for an air-conditioning system, which includes one or more processors and a non-temporary computer-readable storage medium storing program instructions. When the one or more processors execute the program instructions, the one or more processors are used to implement the method according to any one of the first aspects.

[0053] A fourth aspect of the present invention discloses an air-conditioning system, which adopts any one of the methods in the first aspect, or includes the control device in the second aspect.

[0054] Beneficial Effects: The present invention reduces the beat frequency sound and achieves optimal system matching while synchronously adjusting the compressor frequency and external fan speed, thereby reducing the fluctuation of the compressor frequency and external fan speed, improving system reliability and user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] The above and other objects, features, and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the accompanying drawings. The drawings described below are only some embodiments disclosed in the present invention. It is obvious to a person skilled in the art that other drawings can be derived from these drawings without inventive effort.

[0056] Figure 1 A schematic flow chart of a method for controlling an air-conditioning system according to an embodiment of the present invention is exemplarily shown;

[0057] Figure 2 The following is a schematic diagram showing the relationship between the target rotation speed of an external fan and the beat frequency range according to an embodiment of the present invention;

[0058] Figure 3 A schematic flow chart of a method for controlling an air-conditioning system according to an embodiment of the present invention is exemplarily shown;

[0059] Figure 4 A schematic flow chart of a method for controlling an air-conditioning system according to an embodiment of the present invention is exemplarily shown;

[0060] Figure 5 A flow chart of a method for controlling an air-conditioning system according to an embodiment of the present invention is exemplarily shown. DETAILED DESCRIPTION

[0061] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0062] The terms used in the embodiments of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The singular forms "a," "the," and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates otherwise. "A plurality" generally includes at least two, but does not exclude the inclusion of at least one.

[0063] It should be understood that the term "and / or" as used herein is merely a description of the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0064] It should also be noted that the terms "include," "comprises," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a product or system comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such product or system. In the absence of further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the product or system comprising the element.

[0065] The existing solutions to avoid beat frequency sound and resonance are to unilaterally adjust the compressor frequency or the external fan speed to avoid beat frequency sound and resonance, but cannot achieve the optimal system capacity and energy efficiency. To this end, the embodiment of the present invention provides a control method for an air conditioning system, combined with Figure 1 Methods include:

[0066] S01, after the air conditioning system is started, obtain the outdoor ambient temperature and the compressor target frequency;

[0067] S02, determining a target speed of the outdoor fan according to the outdoor ambient temperature and the target frequency of the compressor;

[0068] S03, determining whether the compressor target frequency is within the beat frequency range corresponding to the external fan target speed;

[0069] If so, loop through the following steps:

[0070] S11, adjusting the compressor target frequency so that the adjusted compressor target frequency avoids the beat frequency interval, and determining a new outdoor fan target speed based on the adjusted compressor target frequency and the outdoor ambient temperature, and the time interval between the above two adjustment actions must meet the set conditions;

[0071] S12, determine whether the adjusted compressor target frequency is within the beat frequency range corresponding to the new external fan target speed; if so, go to step S11, if not, exit the loop.

[0072] This embodiment determines the optimal external fan target speed based on the current compressor target frequency and the outdoor ambient temperature, and determines the beat frequency interval of the compressor frequency based on the external fan target speed. When the compressor avoids the target frequency of the beat frequency interval, the current optimal system matching external fan target speed is calculated in reverse, and then a new compressor beat frequency interval is determined based on the external fan target speed. This adjustment is repeated in order to achieve the optimal capacity and energy efficiency. However, in order to reduce the beat frequency sound and achieve the best system matching at the same time, the compressor frequency and external fan speed are adjusted synchronously, which may cause the problem of fluctuations in the compressor frequency and external fan speed. This embodiment can effectively solve the problem of reducing the fluctuations in the compressor frequency and external fan speed when the compressor frequency and external fan speed are adjusted synchronously to reduce the beat frequency sound and achieve the best system matching at the same time by limiting the time interval between the above two adjustment actions so that it meets the set conditions.

[0073] Further optionally, step S02 includes:

[0074] The target speed of the external fan corresponding to the outdoor ambient temperature and the target frequency of the compressor is determined by utilizing the corresponding relationship between the external ring temperature, the target frequency of the compressor and the target speed of the external fan.

[0075] In this embodiment, the air conditioning system preferably uses a variable frequency air conditioner. In the outdoor unit control, multiple gears are set for the outdoor DC fan. The compressor target frequency and the outdoor ambient temperature ultimately determine different fan target gears. The compressor target frequency is not affected by the outdoor fan gear when non-resonance is avoided. As shown in Table 1 below, the outdoor fan gear is affected by T c (Outdoor ambient temperature) Fc (compressor target frequency) control.

[0076] Table 1

[0077]

[0078] Further optionally, step S11 includes:

[0079] S111, adjusting the compressor target frequency to a resonance-avoiding target frequency, and recording the number of resonance-avoiding processing times;

[0080] S112, monitoring the operating frequency of the compressor, and when the operating frequency of the compressor reaches a target frequency for avoiding resonance, controlling the compressor to operate at the target frequency for avoiding resonance, and recording the operating time of the compressor at the target frequency for avoiding resonance;

[0081] S113, determining whether the number of resonance frequency avoidance processing times and the operating time meet the set conditions; if so, executing S114;

[0082] S114: Determine a new target speed of the outdoor fan according to the outdoor ambient temperature and the target frequency for avoiding resonance.

[0083] Reference Figure 2 , the compressor resonance area is (F2, F3), near the critical point of switching between the middle and high wind speeds, as shown in the dotted box. cThe target frequency of the compressor is F1, and the target gear of the external fan is the medium-wind gear. The calculated resonance zone of the compressor when the external fan gear is the medium-wind gear is (F2, F3), and the target frequency of the compressor avoids the resonance zone of the compressor and is increased to F2. At this time, in order to ensure the system capacity and energy efficiency, the optimal external fan gear is switched to the high wind gear when the target frequency of the compressor is F2. The change of the wind gear also changes the resonance zone of the compressor, which will make (F2, F3) become the non-resonance zone. At this time, in order to achieve the optimal capacity and energy efficiency, the target frequency of the compressor may be reduced to F1, and the external fan gear is converted to the medium-wind gear under this frequency operation. Under the medium-wind gear, it is confirmed that (F2, F3) becomes the resonance zone, and the frequency is increased to avoid it. This is repeated. The operating frequency of the compressor and the gear of the external fan will be in a fluctuating non-stable state, the noise of the whole machine will increase, and the reliability will decrease. In this embodiment, if the number of consecutive times of avoiding the resonance frequency does not reach a preset value (a typical value is 3 times), the target fan gear is recalculated only when the continuous operation time T of the compressor avoiding the resonance target frequency reaches a preset minimum operation time (typically 5 minutes); or if the number of consecutive times of avoiding the resonance frequency reaches a preset value (a typical value is 3), the target fan gear is recalculated immediately, which can reduce the fluctuations of the compressor frequency and the external fan speed while ensuring the system capacity and energy efficiency.

[0084] Further optionally, S113 includes the following steps:

[0085] A1, compares the number of resonance frequency avoidance processes with the set number, and compares the running time with the set time;

[0086] A2: When the number of resonance frequency avoidance processes is less than the set number and the running time reaches the set time, the set conditions are considered to be met;

[0087] A3, when the number of resonance frequency avoidance processes is greater than or equal to the set number, the loop is exited.

[0088] In this embodiment, the setting number is preferably 3, and the setting time is preferably 5 minutes. When adjusting the compressor target frequency to avoid the beat frequency interval and adjusting the target speed of the external fan in conjunction with each other to achieve the optimal system matching, each time the resonance frequency avoidance process is performed, the optimal target speed of the external fan is searched in conjunction with each other. When the number of resonance frequency avoidance processes exceeds 3 times, it is regarded that the target speed of the external fan at this time is adjusted to the optimal, and the loop is exited at this time. When the number of resonance frequency avoidance processes does not exceed 3 times, after allowing the compressor and fan to run continuously in the avoided interval for a minimum time T, the target speed of the external fan is re-determined based on the adjusted compressor target frequency and the outdoor ambient temperature to find the optimal match of the system and reduce the fluctuations in the compressor frequency and fan speed.

[0089] Further optionally, when monitoring the operating frequency of the compressor, the method further includes:

[0090] When the operating frequency of the compressor reaches the beat frequency range, the speed at which the compressor increases or decreases frequency is increased.

[0091] Specifically, the compressor avoids the target frequency, usually upward, so the actual operating frequency will inevitably pass through the resonance range. In this case, the frequency must be quickly increased to quickly skip the resonance zone. If the target frequency is to be avoided downward, the frequency must be quickly reduced to quickly skip the resonance zone.

[0092] Further optionally, after exiting the loop, the method further includes:

[0093] Clears the number of times the resonance frequency is avoided.

[0094] After exiting the loop, the number of times the resonance frequency is avoided is cleared, so that the above interval time and the timing of exiting the loop can be determined next time when the beat frequency sound is reduced and the best system matching is achieved.

[0095] Further optionally, the beat frequency interval is (F2, F3);

[0096] F2=F 共振基频 -A, F3=F 共振基频 +A, 2≤A≤4(Hz);

[0097] Among them, F 共振基频 =2×[(n×N) / 60], where n represents the target speed of the external fan, and N represents the number of blades of the external fan.

[0098] Further optionally, the adjusted compressor target frequency is greater than or equal to F3.

[0099] The adjusted compressor target frequency, ie, the resonance-avoiding target frequency, is greater than or equal to F3, preferably F3.

[0100] Combine Figure 3 The strategy for adjusting the compressor frequency of this embodiment is further described in detail. Figure 3 , adjust the compressor frequency strategy: (1) adjust the compressor target frequency to avoid the resonance zone; (2) the number of resonance frequency avoidance processes + 1; (3) the compressor frequency reaches the resonance avoidance target frequency, start the timer T; (4) when the compressor frequency reaches the resonance zone, adjust the frequency increase / decrease speed so that the compressor frequency quickly skips the resonance zone; (5) if the number of consecutive resonance frequency avoidance times does not reach the preset value (typical value is 3 times), the compressor will recalculate the target fan gear only when the continuous operation time T of avoiding the resonance target frequency reaches the preset minimum operation time (typically 5 minutes). If the number of consecutive resonance frequency avoidance times reaches the preset value (typical value is 3), the loop will be exited.

[0101] The embodiment of the present invention also discloses a control method for an air conditioning system, Figure 4, the method comprises the following steps:

[0102] S01, after the air conditioning system is started, obtain the outdoor ambient temperature and the compressor target frequency;

[0103] S02, determining a target speed of the outdoor fan according to the outdoor ambient temperature and the target frequency of the compressor;

[0104] S03, determining whether the compressor target frequency is within the beat frequency range corresponding to the external fan target speed;

[0105] If so, loop through the following steps:

[0106] S21, adjusting the target speed of the outdoor fan to change the beat frequency range so that the compressor target frequency is not within the adjusted beat frequency range, correcting the compressor target frequency to the optimal target frequency, and determining a new target speed of the outdoor fan based on the optimal target frequency and the outdoor ambient temperature. The time interval between the two actions of adjusting the target speed of the outdoor fan must meet the set conditions;

[0107] S22, determine whether the optimal target frequency is within the beat frequency range corresponding to the new target speed of the outdoor fan; if so, go to step S1, if not, exit the loop.

[0108] This embodiment determines the beat frequency range of the compressor frequency based on the current compressor target frequency and the external fan target speed. When the compressor avoids the target frequency of the beat frequency range, the current optimal system matching external fan target speed is calculated in reverse, and then a new compressor beat frequency range is determined based on the external fan target speed. This adjustment is repeated in order to achieve optimal capacity and energy efficiency. In this way, when the compressor frequency and external fan speed are adjusted synchronously to reduce the beat frequency sound and achieve the best system match, there may be a problem of fluctuations in the compressor frequency and external fan speed. This embodiment is mainly to solve the problem of reducing the fluctuations in the compressor frequency and external fan speed when the compressor frequency and external fan speed are adjusted synchronously to reduce the beat frequency sound and achieve the best system match.

[0109] Further optionally, step S21 includes:

[0110] S211, adjusting the target speed of the outdoor fan to the resonance avoidance target speed, and recording the number of resonance speed avoidance processing times;

[0111] S212, monitoring the operating speed of the external fan, and when the operating speed of the external fan reaches a target speed for avoiding resonance, controlling the external fan to operate at the target speed for avoiding resonance, and recording the operating time of the external fan at the target speed for avoiding resonance;

[0112] S213, determining whether the number of resonance speed avoidance processing times and the operating time meet the set conditions; if so, executing S214;

[0113] S214: Determine a new target speed of the outdoor fan according to the outdoor ambient temperature and the optimal target frequency.

[0114] Combine Figure 5 The strategy for adjusting the speed of the external fan in this embodiment is further described in detail. Figure 5 , adjust the external fan speed strategy: (1) adjust the external fan speed to avoid the resonance zone; (2) the number of resonance speed avoidance processing times + 1; (3) the external fan speed reaches the resonance avoidance target speed, start the timer T; if the number of consecutive times of resonance fan speed avoidance does not reach the preset value (preferred value is 3 times), the fan will not recalculate the target fan gear until the continuous operation time T of avoiding the resonance target speed reaches the preset minimum operation time (typically 5 minutes). The loop will be exited when the number of consecutive times of resonance frequency avoidance reaches the preset value (typical value is 3). In order to further reduce the fluctuation of fan gear switching, each wind speed must run for at least the preset time (preferred value 80S) before adjustment is allowed.

[0115] Further optionally, the above step S213 includes the following steps:

[0116] B1, compare the number of resonance speed avoidance processing times with the set number, and compare the running time with the set time;

[0117] B2: When the number of resonance speed avoidance processes is less than the set number and the running time reaches the set time, the set conditions are considered to be met;

[0118] B3, when the number of resonance speed avoidance processes is greater than or equal to the set number, the loop is exited.

[0119] The preferred setting number is 3 times, and the preferred running time is 5 minutes.

[0120] Further optionally, after exiting the loop, the method further includes: clearing the number of resonance speed avoidance processing times;

[0121] The beat frequency range is greater than or equal to F2 and less than or equal to F3;

[0122] Where F2 = F 共振基频 -A, F3=F 共振基频 +A, 2≤A≤4;

[0123] F 共振基频 =2×[(n×N) / 60], where n represents the target speed of the external fan, and N represents the number of blades of the external fan.

[0124] An embodiment of the present invention also discloses a control device for an air-conditioning system, which includes one or more processors and a non-temporary computer-readable storage medium storing program instructions. When the one or more processors execute the program instructions, the one or more processors are used to implement any method provided in the above embodiments.

[0125] An embodiment of the present invention further discloses an air-conditioning system, which adopts any one of the methods provided in the above embodiments, or includes the control device provided in the above embodiments.

[0126] This embodiment provides a control method, control device, and air conditioning system for an air conditioning system. The system determines a compressor frequency beat frequency range based on the current compressor target frequency and external fan target speed. This strategy involves adjusting the compressor frequency and external fan speed in a coordinated manner to reduce beat frequency noise while achieving optimal system matching. By ensuring that the time interval between these two adjustments meets a set condition, fluctuations in the compressor frequency and external fan speed are reduced, improving system reliability and user experience.

[0127] In different embodiments provided by the present invention, the same parameters, nouns, logic, etc. should be understood as having a unified meaning, and this application does not intentionally repeat the description in each embodiment.

[0128] The exemplary embodiments of the present disclosure are specifically shown and described above. It should be understood that the present disclosure is not limited to the detailed structures, configurations or implementations described herein; on the contrary, the present disclosure is intended to cover various modifications and equivalent configurations included within the spirit and scope of the appended claims.

Claims

1. A method for controlling an air conditioning system, characterized in that: The method comprises: After the air conditioning system is started, the outdoor ambient temperature and compressor target frequency are obtained; Determining a target speed of the outdoor fan according to the outdoor ambient temperature and the target frequency of the compressor; Determining whether the compressor target frequency is within a beat frequency interval corresponding to the external fan target speed; If so, loop through the following steps: S11, adjusting the compressor target frequency so that the adjusted compressor target frequency avoids the beat frequency interval, determining a new outdoor fan target speed according to the adjusted compressor target frequency and the outdoor ambient temperature, and determining a new compressor beat frequency interval according to the new outdoor fan target speed; S12, determining whether the adjusted compressor target frequency is within a new compressor beat frequency range corresponding to the new external fan target speed; If yes, go to step S11, and the time interval between the two actions of adjusting the target frequency of the compressor must meet the set conditions; if not, exit the loop; The step S11 includes: adjusting the compressor target frequency to a resonance-avoiding target frequency, and recording the number of resonance-avoiding processing times; monitoring the operating frequency of the compressor, and when the operating frequency of the compressor reaches the resonance-avoiding target frequency, controlling the compressor to operate at the resonance-avoiding target frequency, and recording the operating time of the compressor operating at the resonance-avoiding target frequency; Determining whether the number of resonance frequency avoidance processing times and the operating time satisfy the set conditions; If so, the new target speed of the outdoor fan is determined according to the outdoor ambient temperature and the resonance-avoiding target frequency.

2. The method according to claim 1, wherein The step of determining the target speed of the outdoor fan according to the outdoor ambient temperature and the target frequency of the compressor includes: The target speed of the external fan corresponding to the outdoor ambient temperature and the target frequency of the compressor is determined by utilizing the corresponding relationship between the external ring temperature, the target frequency of the compressor, and the target speed of the external fan.

3. The method according to claim 2, wherein When monitoring the operating frequency of the compressor, the method further includes: When the operating frequency of the compressor reaches the beat frequency interval, the speed of increasing or decreasing the frequency of the compressor is increased.

4. The method according to any one of claims 1 to 3, wherein The determining whether the number of resonance frequency avoidance processing times and the operating time satisfy the set conditions includes: Comparing the number of resonance frequency avoidance processes with a set number of processes, and comparing the operating time with a set time; When the number of times the resonance frequency avoidance process is performed is less than the set number and the operation time reaches the set time, it is considered that the set condition is satisfied.

5. The method according to claim 4, wherein The method further includes: exiting the loop when the number of times the resonance frequency avoidance process is greater than or equal to the set number of times.

6. The method according to claim 1, wherein After exiting the loop, the method further includes: Clear the number of times the resonance frequency avoidance process is performed.

7. The method according to claim 6, wherein The beat frequency interval is (F2, F3); <h2 style=";text-align:left;direction:ltr">F2=F<h2 style=";text-align:left;direction:ltr"> 共振基频 <h2 style=";text-align:left;direction:ltr"> -A,F3=F<h2 style=";text-align:left;direction:ltr"> 共振基频 <h2 style=";text-align:left;direction:ltr"> +A,2≤A≤4。 8. The method according to claim 7, wherein The adjusted compressor target frequency is greater than or equal to F3.

9. A method for controlling an air conditioning system, characterized in that: The method comprises: After the air conditioning system is started, the outdoor ambient temperature and compressor target frequency are obtained; Determining a target speed of the outdoor fan according to the outdoor ambient temperature and the target frequency of the compressor; Determining whether the compressor target frequency is within a beat frequency interval corresponding to the external fan target speed; If so, loop through the following steps: S21, adjusting the target speed of the outdoor fan to change the beat frequency interval so that the target frequency of the compressor is not in the adjusted beat frequency interval, correcting the target frequency of the compressor to an optimal target frequency, and determining a new target speed of the outdoor fan according to the optimal target frequency and the outdoor ambient temperature, and determining a new beat frequency interval corresponding to the new target speed of the outdoor fan according to the new target speed of the outdoor fan; S22, determining whether the optimal target frequency is within the beat frequency interval corresponding to the new target speed of the external fan; if so, proceeding to step S21, and ensuring that the time interval between the two actions of adjusting the target speed of the external fan meets the set condition; if not, exiting the loop; in: The step S21 includes: Adjusting the target speed of the external fan to a resonance-avoiding target speed, and recording the number of resonance speed-avoiding processing times; monitoring the operating speed of the external fan, and when the operating speed of the external fan reaches the resonance-avoiding target speed, controlling the external fan to operate at the resonance-avoiding target speed, and recording the operating time of the external fan operating at the resonance-avoiding target speed; determining whether the resonance speed avoidance processing times and the operating time satisfy the set condition; If so, the new target speed of the outdoor fan is determined according to the outdoor ambient temperature and the optimal target frequency.

10. The method according to claim 9, wherein The determining whether the number of resonance speed avoidance processing times and the operating time satisfy the set condition includes: Comparing the resonance speed avoidance processing times with a set number, and comparing the operation time with a set time; When the number of resonance speed avoidance processes is less than the set number and the operating time reaches the set time, it is considered that the set condition is satisfied.

11. The method according to claim 10, wherein The method further comprises: When the number of times the resonance speed avoidance process is performed is greater than or equal to the set number, the loop is exited.

12. The method according to any one of claims 9 to 11, wherein After exiting the loop, the method further includes: clearing the number of resonance speed avoidance processing times; The beat frequency interval is greater than or equal to F2 and less than or equal to F3; Where F2 = F 共振基频 -A, F3=F 共振基频 +A, 2≤A≤4.

13. A control device for an air conditioning system, characterized in that: The method comprises one or more processors and a non-transitory computer-readable storage medium storing program instructions. When the one or more processors execute the program instructions, the one or more processors are configured to implement the method according to any one of claims 1 to 12.

14. An air conditioning system, characterized in that: It adopts the method according to any one of claims 1 to 12, or includes the control device according to claim 13.

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