Air conditioner active noise reduction control method and air conditioner

Abstract

The application provides a control method for active noise reduction of an air conditioner and the air conditioner. The control method comprises the following steps: S1, air conditioner operation; S2, obtaining a total noise value A of the air conditioner in a unit time length, a noise nominal value B corresponding to a current air baffle, a noise peak value D in a process from a low frequency to a highest frequency, obtaining N continuous As in a continuous time, and calculating an average value C; S3, judging whether A-B is greater than or equal to a first preset value; if yes, S4 is performed; if no, S6 is performed; S4, judging whether C-B is less than the first preset value; if yes, S5 is performed; if no, S8 is performed; S5, judging whether A-D is greater than a second preset value; if yes, the noise is qualified; if no, S8 is performed; S6, judging whether A-D is greater than the second preset value; if yes, the noise is qualified; if no, S7 is performed; S7, judging whether C-D is greater than the second preset value; if yes, the noise is qualified; if no, S8 is performed; and S8, adjusting a wind guide door swing angle. The application can effectively avoid misjudgment and improve the accuracy of the determination result.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to a control method for active noise reduction in air conditioning and an air conditioner. Background Technology

[0002] With the development of technology, air conditioners are becoming more and more common in daily life, and people's demand for intelligent air conditioners is also increasing. However, air conditioners with high air volume, fast cooling, and low noise are the ones that best meet the needs of customers. Air conditioners that have been running for a long time will more or less have various noise problems. There are many reasons for loud air conditioner noise, mainly including loose air outlets, loose air conditioner panels, unstable installation of indoor units, loose compressors, and loose casings. From the user's perspective, users may silently endure it and consider replacing the air conditioner. However, if the air conditioner is not replaced before its service life is over, they can only continue to endure the noise.

[0003] Current air conditioners often feature a silent fan setting, allowing users to select it according to their needs. This involves operating at low fan speed, low fan speed, and low frequency, sacrificing cooling capacity to reduce noise. This results in a low level of intelligence in the noise reduction process of existing air conditioners, making it difficult to improve the precision of noise reduction. Summary of the Invention

[0004] In view of this, the present invention aims to propose a control method and air conditioner for active noise reduction in air conditioners, so as to solve the problems of low intelligence and poor accuracy of noise processing in the existing technology.

[0005] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0006] A method for controlling active noise reduction in an air conditioner includes: S1, air conditioner operation; S2, real-time acquisition of the total noise value A of the air conditioner within a unit time period, the nominal noise value B corresponding to the current fan speed, and the noise peak value D during the process of the air conditioner operating from low frequency to the highest frequency, acquiring N consecutive A values ​​within a continuous time period, and calculating the average value C based on the N consecutive A values; S3, determining whether AB ≥ a first preset value; if yes, proceed to step S4; if no, proceed to step S6; S4, determining whether CB < a first preset value; if yes, then... Proceed to step S5; if not, the noise level is unqualified, and proceed to step S8; S5: For any unit duration A, determine whether AD > the second preset value; if yes, the noise level is qualified; if no, the noise level is unqualified, and proceed to step S8; S6: Determine whether AD > the second preset value; if yes, the noise level is qualified; if no, proceed to step S7; S7: Determine whether CD > the second preset value; if yes, the noise level is qualified; if no, the noise level is unqualified, and proceed to step S8; S8: Adjust the swing angle of the air guide damper. Therefore, compared to the existing technology where air conditioners only sequentially perform "total value judgment" and "difference value judgment" in the noise processing process, this application additionally sets up "mean value judgment" and "mean value difference judgment," so that regardless of the result of the "total value judgment," two corresponding judgment processes will be performed after the "total value judgment" to avoid misjudgment and improve the accuracy of the judgment results.

[0007] Step S8 includes: S81, adjusting the swing angle of the air guide damper once with a first preset angle; S82, determining whether AB < the first preset value; if yes, proceeding to step S83; if no, returning to step S81; S83, adjusting the swing angle of the air guide damper sequentially with a second preset angle until the minimum total noise value Amin is obtained, and then proceeding to step S84 at the air guide damper swing angle corresponding to Amin; S84, determining whether at least one of AD > the second preset value or CD > the second preset value is met; if yes, the noise is acceptable; if no, the noise is abnormal. Wherein, the first preset angle is 2°, the second preset angle is 1°, the first preset value is 3dB, and the second preset value is 8dB. Thus, through steps S81-S84, the two-stage swing angle adjustment process is used to minimize noise. On the one hand, this helps to simultaneously ensure the speed and accuracy of the swing angle adjustment, improving the efficiency of the air conditioner's active noise reduction; on the other hand, it allows for accurate and timely identification of abnormal air conditioner noise, facilitating timely handling of air conditioner malfunctions by users or after-sales service.

[0008] Step S1 includes: S11, setting the rated start-up time for the air conditioner; S12, controlling the compressor frequency to reach the highest operating frequency corresponding to the current external ambient temperature; S13, acquiring the absolute value of the compressor exhaust temperature change ΔT and the absolute value of the air conditioner current change ΔI within a unit time in real time; S14, determining whether ΔT ≤ the first preset temperature value and ΔI ≤ the preset current value; if yes, it indicates that the air conditioner is operating stably, and proceed to step S2; if no, return to step S12. Here, the rated time is 10 minutes, the unit time is 3 minutes, the first preset temperature value is 1℃, and the preset current value is 0.1A. Therefore, this application controls the compressor to reach the highest frequency after the air conditioner starts, determines whether the air conditioner is in a stable operating state based on the determination of ΔT and ΔI, and executes step S2 only after the air conditioner is operating stably, which helps ensure the accuracy of the control method.

[0009] Step S1, after the air conditioner is running stably, includes: S101, real-time detection of the air conditioner outlet temperature T; S102, determining whether T meets the comfort temperature condition; if yes, proceed to step S2; if no, proceed to step S103; S103, adjusting the opening of the electronic expansion valve and determining whether T meets the comfort temperature condition; if yes, proceed to step S2; if no, proceed to step S104; S104, adjusting the indoor fan speed and determining whether T meets the comfort temperature condition; if yes, proceed to step S2; if no, the air conditioner outlet temperature is abnormal. The comfort temperature condition includes: under cooling demand, T < 15℃; under heating demand, T > 35℃. Step S103 is as follows: Within the preset valve step adjustment range of the electronic expansion valve, the opening degree of the electronic expansion valve is gradually adjusted; if T meets the comfortable temperature condition during the step-by-step adjustment of the electronic expansion valve opening, then proceed to step S2; if T does not meet the comfortable temperature condition during the step-by-step adjustment of the electronic expansion valve opening, then proceed to step S104. Step S104 is as follows: Within the preset correction range of the indoor fan, the indoor fan speed is adjusted step-by-step at a preset speed value; if T meets the comfortable temperature condition during the step-by-step adjustment of the indoor fan speed, then proceed to step S2; if T does not meet the comfortable temperature condition during the step-by-step adjustment of the indoor fan speed, then the air conditioner outlet temperature is abnormal. The preset valve step adjustment range is the initial electronic expansion valve opening ±3 steps, the preset correction range is the initial indoor fan speed ±50 rpm, and the preset speed value is 2 rpm. By progressively adjusting the opening of the electronic expansion valve and the indoor fan speed, the system aims to ensure that temperature T meets comfortable conditions as much as possible. This allows the air conditioner to maintain a comfortable airflow during active noise reduction, thus ensuring user comfort. Furthermore, if adjusting the electronic expansion valve opening and indoor fan speed fails to achieve the desired comfortable temperature T, the air conditioner can promptly detect abnormal airflow temperature. It can display an abnormal airflow temperature indicator or issue an audible and visual alarm, allowing users to be immediately aware of the malfunction. Alternatively, the air conditioner can remotely transmit fault data to after-sales service for timely on-site maintenance.

[0010] An air conditioner employs the aforementioned active noise reduction control method; the air conditioner includes an outdoor unit and an indoor unit, the indoor unit being connected to the outdoor unit, and the air outlet of the indoor unit being equipped with a sound acquisition device and a temperature sensor.

[0011] Compared with existing technologies, the active noise reduction control method and air conditioner of the present invention have the following advantages:

[0012] The present invention discloses an active noise reduction control method and air conditioner for air conditioners. First, through the initial determination in step S3 (using A and the nominal value B to perform a "total value determination"), the process is divided into two steps based on the determination result:

[0013] If AB ≥ the first preset value in the initial judgment, it indicates that the noise within a certain unit of time may be unqualified. To avoid misjudgment, this application sets a first-level judgment (step S4, using the average value C of the total noise value in a continuous time period to perform "mean value judgment") and a second-level judgment (step S5, using A and the noise peak value D to perform "difference value judgment") in sequence, which further provides two levels of verification for the initial judgment result to improve the accuracy of the judgment result; if both the first-level judgment and the second-level judgment are satisfied, it indicates that the initial judgment result may be a misjudgment caused by noise data fluctuation interference, and the actual noise of the air conditioner is qualified; if either the first-level judgment or the second-level judgment is not satisfied, it indicates that the air conditioner noise is unqualified, and it is necessary to adjust the air guide door swing angle in time (step S8) to perform active noise adjustment in order to achieve active noise reduction of the air conditioner;

[0014] If AB < the first preset value in the initial judgment, it indicates that the noise within a certain unit of time is qualified. However, in order to avoid noise abnormalities in other time periods and thus misjudgment, this application sets a first-level judgment (step S6, using A and the noise peak value D to perform "difference judgment") and a second-level judgment (step S7, using the average value C and the noise peak value D to perform "difference judgment of the mean") to provide two levels of verification for the initial judgment result, so as to improve the accuracy of the judgment result. If the first-level judgment or the second-level judgment is met, it indicates that the air conditioner noise is qualified. If neither the first-level judgment nor the second-level judgment is met, it indicates that the initial judgment result is misjudged and the actual noise of the air conditioner is unqualified. It is necessary to adjust the air guide door swing angle in time (step S8) to perform active noise adjustment in order to achieve active noise reduction of the air conditioner.

[0015] Compared to existing technologies where air conditioners only perform "total value determination" and "difference value determination" sequentially during noise processing, this application additionally sets up "mean value determination" and "mean value difference determination." This ensures that regardless of the result of "total value determination," two corresponding determination processes (or verification processes) will be performed after "total value determination" to avoid misjudgment and improve the accuracy of the determination results. Attached Figure Description

[0016] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0017] Figure 1 This is a flowchart illustrating an active noise reduction control method for air conditioners according to an embodiment of the present invention. Detailed Implementation

[0018] The inventive concepts of this disclosure will be described below using terminology commonly used by those skilled in the art to communicate the essence of their work to others skilled in the art. However, these inventive concepts may be embodied in many different forms and should not be construed as limited to the embodiments described herein.

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0020] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] In addressing air conditioner noise, existing systems often use a silent fan setting, allowing users to select it based on their needs. This involves operating at low fan speed, low fan speed, and low frequency, sacrificing cooling capacity to reduce noise. This results in a low level of intelligence in the noise reduction process, making it difficult to improve the precision of noise reduction.

[0022] To address the issues of low intelligence and poor precision in noise reduction processes in existing air conditioning technologies, this embodiment proposes a control method for active noise reduction in air conditioners, as shown in the attached figure. Figure 1 As shown, the control method includes:

[0023] S1, Air conditioning is running;

[0024] S2. Real-time acquisition of the total noise value A of the air conditioner within a unit time, the nominal noise value B corresponding to the current windshield, and the noise peak value D of the air conditioner from low frequency to the highest frequency. In a continuous time, acquire N consecutive A values ​​and calculate the average value C based on the N consecutive A values.

[0025] The indoor unit of the air conditioner is equipped with a sound acquisition device at the air outlet, which can collect noise waveform spectra over any time period. A can also be referred to as the noise decibel value per unit time, B is the data pre-stored by the air conditioner, and D is the peak value (maximum value) of the noise waveform during the process of the air conditioner gradually operating from low frequency to the highest frequency. C is the average value in the conventional mathematical sense, that is, C = (A1 + A2 + ... + AN) / N. Preferably, the unit time is 1 minute, N is 6, that is, C is the average value calculated by acquiring 6 consecutive A values ​​within 6 consecutive minutes.

[0026] S3. Determine whether AB ≥ the first preset value; if yes, proceed to step S4; if no, proceed to step S6.

[0027] S4. Determine whether CB < the first preset value; if yes, proceed to step S5; if no, the noise is unqualified, and proceed to step S8.

[0028] S5. For any unit duration A, determine whether AD > the second preset value; if yes, the noise is qualified; if no, the noise is unqualified, and proceed to step S8.

[0029] S6. Determine whether AD > the second preset value; if yes, the noise is qualified; if no, proceed to step S7.

[0030] S7. Determine if CD > the second preset value; if yes, the noise is qualified; if no, the noise is unqualified, and proceed to step S8.

[0031] S8. Adjust the swing angle of the air guide damper.

[0032] The first preset value and the second preset value are both preset data of the air conditioner. This application does not impose specific restrictions, but only provides individual examples for reference, such as: the first preset value is 3dB and the second preset value is 8dB.

[0033] This application first performs an initial determination in step S3 (using A and the nominal value B to perform a "total value determination"), and then proceeds through two processes based on the determination result:

[0034] If AB ≥ the first preset value in the initial judgment, it indicates that the noise within a certain unit of time may be unqualified. To avoid misjudgment, this application sets a first-level judgment (step S4, using the average value C of the total noise value in a continuous time period to perform "mean value judgment") and a second-level judgment (step S5, using A and the noise peak value D to perform "difference value judgment") in sequence, which further provides two levels of verification for the initial judgment result to improve the accuracy of the judgment result; if both the first-level judgment and the second-level judgment are satisfied, it indicates that the initial judgment result may be a misjudgment caused by noise data fluctuation interference, and the actual noise of the air conditioner is qualified; if either the first-level judgment or the second-level judgment is not satisfied, it indicates that the air conditioner noise is unqualified, and it is necessary to adjust the air guide door swing angle in time (step S8) to perform active noise adjustment in order to achieve active noise reduction of the air conditioner;

[0035] If AB < the first preset value in the initial judgment, it indicates that the noise within a certain unit of time is qualified. However, in order to avoid noise abnormalities in other time periods and thus misjudgment, this application sets a first-level judgment (step S6, using A and the noise peak value D to perform "difference judgment") and a second-level judgment (step S7, using the average value C and the noise peak value D to perform "difference judgment of the mean") to provide two levels of verification for the initial judgment result, so as to improve the accuracy of the judgment result. If the first-level judgment or the second-level judgment is met, it indicates that the air conditioner noise is qualified. If neither the first-level judgment nor the second-level judgment is met, it indicates that the initial judgment result is misjudged and the actual noise of the air conditioner is unqualified. It is necessary to adjust the air guide door swing angle in time (step S8) to perform active noise adjustment in order to achieve active noise reduction of the air conditioner.

[0036] Compared to existing technologies where air conditioners only perform "total value determination" and "difference value determination" sequentially during noise processing, this application additionally sets up "mean value determination" and "mean value difference determination." This ensures that regardless of the result of "total value determination," two corresponding determination processes (or verification processes) will be performed after "total value determination" to avoid misjudgment and improve the accuracy of the determination results.

[0037] After determining that the noise level is unacceptable, the air conditioner will adjust the swing angle of the air deflector to reduce the noise as much as possible.

[0038] Specifically, step S8 includes:

[0039] S81. Adjust the swing angle of the air guide door once at the first preset angle;

[0040] S82. Determine whether AB < the first preset value; if yes, proceed to step S83; if no, return to step S81.

[0041] S83. Adjust the swing angle of the air guide door one by one at the second preset angle until the minimum total noise value Amin is obtained within the preset adjustment range of the swing angle of the air guide door. Then, at the swing angle of the air guide door corresponding to Amin, proceed to step S84.

[0042] S84. Determine whether at least one of the conditions AD > second preset value and CD > second preset value is met. If yes, the noise is qualified; otherwise, the noise is abnormal.

[0043] Regarding the air conditioner's swing angle, it is often based on the theoretically optimal initial swing angle. Furthermore, the swing angle of the air deflector is not unlimited; it usually has a preset adjustment range, such as ±10°. The air conditioner adjusts within this ±10° range of the initial swing angle. The first and second preset angles are preset data for the air conditioner, and this application does not impose specific limitations, only providing a few examples for reference, such as a first preset angle of 2° and a second preset angle of 1°. After determining that the air conditioner noise is abnormal, the air conditioner can display a noise abnormality indicator on the screen or issue an audible and visual alarm, allowing the user to be promptly informed of the noise abnormality. Alternatively, the air conditioner can remotely transmit fault data to after-sales service, enabling timely on-site maintenance.

[0044] After the air conditioner passes the relevant judgments in steps S1-S7, if the noise level is determined to be unacceptable, the swing angle will first be coarsely adjusted sequentially until the requirement of AB < the first preset value is met. Then, the swing angle will be finely adjusted sequentially until the minimum value A within the adjustment range and the corresponding swing angle are obtained. At this specific swing angle, the "difference judgment" and "mean difference judgment" are used for judgment. If neither "difference judgment" nor "mean difference judgment" is met, it indicates that the air conditioner noise is abnormal. The user needs to be notified in time, or the after-sales service needs to be notified remotely to check and maintain the air conditioner and deal with the noise problem as soon as possible. Thus, this application uses a two-stage swing angle adjustment process in steps S81-S84 to reduce noise as much as possible. On the one hand, it helps to ensure the speed and accuracy of swing angle adjustment, improve the efficiency of active noise reduction of the air conditioner, and on the other hand, it can accurately and timely identify the abnormal air conditioner noise, so that the user or after-sales service can deal with the air conditioner fault in a timely manner.

[0045] In any of steps S5, S6, S7, and S84, after the noise level is determined to be within acceptable limits, a loop counter can be set to improve the accuracy of the determination. This counter checks if the noise has been continuously looped K times. If not, the process returns to step S3; otherwise, the air conditioner noise is determined to be normal. This ensures that during the K loop determination process, the air conditioner noise is only determined to be normal after all determinations show the noise level as acceptable, which helps improve the accuracy of the active noise reduction process. Preferably, K is 50 loops.

[0046] In step S1, considering the precision of the control method, the active noise reduction process needs to be performed after the air conditioner is running smoothly. Specifically, step S1 includes:

[0047] S11, Rated start-up and operation time of the air conditioner;

[0048] S12. Control the compressor frequency to reach the highest operating frequency corresponding to the current external ambient temperature;

[0049] S13. Real-time acquisition of the absolute value of the compressor exhaust temperature change ΔT and the absolute value of the air conditioner current change ΔI per unit time;

[0050] S14. Determine whether ΔT ≤ the first preset temperature value and ΔI ≤ the preset current value; if yes, it means the air conditioner is running stably, proceed to step S2; if no, return to step S12.

[0051] The rated time, unit time, first temperature preset value, and current preset value are all preset data for the air conditioner. This application does not impose specific limitations, but only provides a few examples for reference, such as: rated time of 10 minutes, unit time of 3 minutes, first temperature preset value of 1℃, and current preset value of 0.1A. Similarly, the air conditioner has pre-stored corresponding data of the external ambient temperature and the compressor's maximum operating frequency.

[0052] Therefore, after the air conditioner is started, this application controls the compressor to reach the highest frequency, determines whether the air conditioner is in a stable operating state based on the determination of ΔT and ΔI, and executes step S2 only after the air conditioner is in stable operation, which helps to ensure the accuracy of the control method.

[0053] Since the execution of the control method often takes a certain amount of time, and considering the user's experience with the air conditioner, after the air conditioner is running smoothly in step S1, step S1 further includes:

[0054] S101. Real-time monitoring of air conditioner outlet temperature T;

[0055] The air conditioner has a temperature sensor installed at the air outlet.

[0056] S102. Determine whether T meets the comfortable temperature condition; if yes, proceed to step S2; if no, proceed to step S103.

[0057] Based on people's daily physical needs, the comfortable temperature conditions include: for cooling needs, T < 15℃; for heating needs, T > 35℃.

[0058] S103. Within the preset valve step adjustment range of the electronic expansion valve, gradually (valve step) adjust the opening degree of the electronic expansion valve; if T meets the comfortable temperature condition during the step-by-step adjustment of the opening degree of the electronic expansion valve, then proceed to step S2; if T does not meet the comfortable temperature condition during the step-by-step adjustment of the opening degree of the electronic expansion valve, then proceed to step S104.

[0059] S104. Within the preset correction range of the indoor fan, the indoor fan speed is adjusted step by step with a preset speed value; if T meets the comfortable temperature condition during the step-by-step adjustment of the indoor fan speed, then proceed to step S2; if T does not meet the comfortable temperature condition during the step-by-step adjustment of the indoor fan speed, then the air conditioner outlet temperature is abnormal.

[0060] The electronic expansion valve opening and indoor fan speed are typically in optimal operating condition after the air conditioner is turned on. This application uses this optimal state as a benchmark, setting preset valve adjustment ranges and preset correction ranges. If temperature T does not meet the comfort temperature condition after the air conditioner has been running smoothly, this application adjusts the electronic expansion valve opening and indoor fan speed step by step to make T meet the comfort temperature condition as much as possible. This ensures that the air conditioner maintains a relatively comfortable airflow during active noise reduction, thus ensuring user comfort. Furthermore, if adjusting the electronic expansion valve opening and indoor fan speed fails to make T meet the comfort temperature condition, the air conditioner can promptly identify abnormal airflow temperature. The air conditioner can display an abnormal airflow temperature indicator or issue an audible and visual alarm, allowing users to be notified of the malfunction immediately. Alternatively, the air conditioner can remotely transmit fault data to after-sales service for timely on-site maintenance. Preferably, based on the optimal initial electronic expansion valve opening, the preset valve step adjustment range is ±3 steps, and based on the optimal initial indoor fan speed, the preset correction range is ±50 rpm, and the preset speed value is 2 rpm.

[0061] In this invention, the active noise reduction control method described in this embodiment can be used for any air conditioner. Preferably, the air conditioner is an inverter air conditioner, which includes an outdoor unit and an indoor unit connected to the outdoor unit. The indoor unit's air outlet is equipped with a sound acquisition device and a temperature sensor. Furthermore, the air conditioner includes conventional air conditioner components such as heat exchange coils, fans, compressors, and housings. Since these conventional air conditioner components are all existing technologies, they will not be described in detail here.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., 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 active noise reduction in air conditioning, characterized in that, The control method includes: S1, Air conditioning is running; S2. Real-time acquisition of the total noise value A of the air conditioner within a unit time, the nominal noise value B corresponding to the current windshield, and the noise peak value D of the air conditioner during the process from low frequency operation to the highest frequency. Acquire N consecutive A values ​​within a continuous time period, and calculate the average value C based on the N consecutive A values. S3. Determine whether AB ≥ the first preset value; if yes, proceed to step S4; if no, proceed to step S6. S4. Determine whether CB < the first preset value; if yes, proceed to step S5; if no, the noise is unqualified, and proceed to step S8. S5. For any unit duration A, determine whether AD > the second preset value; if yes, the noise is qualified; if no, the noise is unqualified, and proceed to step S8. S6. Determine whether AD > the second preset value; if yes, the noise is qualified; if no, proceed to step S7. S7. Determine if CD > the second preset value; if yes, the noise is qualified; if no, the noise is unqualified, and proceed to step S8. S8. Adjust the swing angle of the air guide damper; Step S8 includes: S81. Adjust the swing angle of the air guide door once at the first preset angle; S82. Determine whether AB < the first preset value; if yes, proceed to step S83; if no, return to step S81. S83. Adjust the swing angle of the air guide door one by one at the second preset angle until the minimum total noise value Amin is obtained, and then perform step S84 at the swing angle of the air guide door corresponding to Amin. S84. Determine whether at least one of the conditions AD > second preset value and CD > second preset value is met. If yes, the noise is qualified; otherwise, the noise is abnormal.

2. The control method for active noise reduction of an air conditioner according to claim 1, characterized in that, The first preset angle is 2°, the second preset angle is 1°, the first preset value is 3dB, and the second preset value is 8dB.

3. The control method for active noise reduction of an air conditioner according to claim 1, characterized in that, Step S1 includes: S11, Rated start-up and operation time of the air conditioner; S12. Control the compressor frequency to reach the highest operating frequency corresponding to the current external ambient temperature; S13. Real-time acquisition of the absolute value of the compressor exhaust temperature change ΔT and the absolute value of the air conditioner current change ΔI per unit time; S14. Determine whether ΔT ≤ the first preset temperature value and ΔI ≤ the preset current value; if yes, it means the air conditioner is running stably, proceed to step S2; if no, return to step S12.

4. The control method for active noise reduction of an air conditioner according to claim 3, characterized in that, The rated time is 10 minutes, the unit time is 3 minutes, the first temperature preset value is 1°C, and the current preset value is 0.1A.

5. The control method for active noise reduction of an air conditioner according to claim 1, characterized in that, Step S1, after the air conditioner is running smoothly, includes: S101. Real-time monitoring of air conditioner outlet temperature T; S102. Determine whether T meets the comfortable temperature condition; if yes, proceed to step S2; if no, proceed to step S103. S103. Adjust the opening of the electronic expansion valve and determine whether T meets the comfortable temperature conditions; if yes, proceed to step S2; if no, proceed to step S104. S104. Adjust the indoor fan speed and determine whether T meets the comfortable temperature conditions; if yes, proceed to step S2; if no, the air conditioner outlet temperature is abnormal.

6. The control method for active noise reduction of an air conditioner according to claim 5, characterized in that, The comfortable temperature conditions include: for cooling needs, T < 15℃; for heating needs, T > 35℃.

7. The control method for active noise reduction of an air conditioner according to claim 5, characterized in that, Step S103 is as follows: Within the preset valve step adjustment range of the electronic expansion valve, the opening degree of the electronic expansion valve is gradually adjusted; if T meets the comfortable temperature condition during the step-by-step adjustment of the opening degree of the electronic expansion valve, then step S2 is performed; if T does not meet the comfortable temperature condition during the step-by-step adjustment of the opening degree of the electronic expansion valve, then step S104 is performed. Step S104 is as follows: Within the preset correction range of the indoor fan, the indoor fan speed is adjusted step by step with a preset speed value; if T meets the comfortable temperature condition during the step-by-step adjustment of the indoor fan speed, then step S2 is performed; if T does not meet the comfortable temperature condition during the step-by-step adjustment of the indoor fan speed, then the air conditioner outlet temperature is abnormal.

8. The control method for active noise reduction of an air conditioner according to claim 7, characterized in that, The preset valve step adjustment range is the initial electronic expansion valve opening ±3 steps, the preset correction range is the initial indoor fan speed ±50 rpm, and the preset speed value is 2 rpm.

9. An air conditioner, characterized in that, The air conditioner uses the active noise reduction control method for air conditioners as described in any one of claims 1-8; the air conditioner includes an outdoor unit and an indoor unit, the indoor unit is connected to the outdoor unit, and the air outlet of the indoor unit is equipped with a sound acquisition device and a temperature sensor.

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