Control method of air conditioner

Abstract

The invention relates to the technical field of air conditioners, particularly provides a control method of an air conditioner, and aims to solve the problem of how to improve the noise reduction effect while guaranteeing the refrigerating or heating effect of the air conditioner. In order to achieve the purpose, the control method of the air conditioner comprises the steps that the real-time noise value of an outdoor unit is obtained; and based on the real-time noise value, selectively adjusting the frequency of the compressor, the opening degree of the electronic expansion valve and the rotating speed of the outdoor fan or adjusting the frequency of the compressor and the opening degree of the electronic expansion valve so as to reduce the noise of the air conditioner. According to the control method of the air conditioner, when the real-time noise value is relatively large, noise can be rapidly reduced so as to prolong the service life of the air conditioner and reduce energy consumption, when the real-time noise value is relatively small, noise is prevented from being too large in advance, meanwhile, the rotating speed of an outdoor fan is not adjusted so as to guarantee the heat exchange efficiency of the air conditioner, and the service life of the air conditioner is prolonged. And the influence on the refrigerating or heating effect is reduced, so that the refrigerating or heating effect of the air conditioner is guaranteed, and meanwhile, the noise reduction effect is improved.

Description

Technical Field

[0001] This invention relates to the field of air conditioner technology, and specifically provides a control method for an air conditioner. Background Technology

[0002] With the continuous development of science and technology and the rapid progress of the social economy, residents' quality of life has been significantly improved, and consumers' demand for household appliances has gradually shifted from meeting basic functions to pursuing a high-quality and comfortable experience. As a core household appliance for regulating indoor temperature and humidity and improving living and working environments, air conditioners have become essential equipment in daily life and production scenarios, and the comfort experience during their operation has become an important consideration for consumers when purchasing and using them.

[0003] Air conditioners generate significant noise during operation. This noise not only affects the user's sensory experience but is also an outward manifestation of the operating condition of the air conditioner's moving parts. If the noise is not reduced in time, it will lead to accelerated wear of the moving parts, affecting the lifespan of the air conditioner and increasing energy consumption. Existing noise reduction methods have poor noise reduction effects and significantly impact cooling and heating performance. Summary of the Invention

[0004] The present invention aims to solve the above-mentioned technical problem, namely, how to improve the noise reduction effect while ensuring the cooling or heating effect of the air conditioner.

[0005] The present invention provides a control method for an air conditioner, the control method comprising: acquiring the real-time noise value of the outdoor unit; and, based on the real-time noise value, selectively adjusting the frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan, or adjusting the frequency of the compressor and the opening degree of the electronic expansion valve, to reduce the noise of the air conditioner.

[0006] When employing the above technical solutions, if the real-time noise level is relatively high, it is necessary to quickly reduce noise to minimize damage to the moving parts of the air conditioner. Therefore, adjusting the compressor frequency, the opening of the electronic expansion valve, and the outdoor fan speed can quickly and efficiently reduce noise, thereby reducing damage to moving parts, extending the lifespan of the air conditioner, and reducing energy consumption. Research has found that when the real-time noise level is relatively low, the noise is mainly generated by the compressor, and the outdoor fan has little impact on the noise. Therefore, when the real-time noise level is relatively low, adjusting the compressor frequency and the opening of the electronic expansion valve can reduce noise and prevent excessive noise in advance. At the same time, without adjusting the outdoor fan speed, the heat exchange efficiency of the air conditioner can be guaranteed, reducing the impact on the cooling or heating effect. Thus, the air conditioner's cooling or heating effect can be guaranteed while simultaneously improving noise reduction.

[0007] In a specific implementation of the control method for the aforementioned air conditioner, the step of "selectively adjusting the compressor frequency, the opening of the electronic expansion valve, and the speed of the outdoor fan based on the real-time noise value, or adjusting the compressor frequency and the opening of the electronic expansion valve" further includes: if the real-time noise value is greater than or equal to a set first noise threshold, then adjusting the compressor frequency, the opening of the electronic expansion valve, and the speed of the outdoor fan; if the real-time noise value is greater than or equal to a set second noise threshold and less than the first noise threshold, then adjusting the compressor frequency and the opening of the electronic expansion valve.

[0008] When the above technical solution is adopted, when the real-time noise value is greater than or equal to the first noise threshold, noise reduction is required and the noise severity is relatively high. Therefore, the compressor frequency, the opening of the electronic expansion valve, and the speed of the outdoor fan are adjusted. When the real-time noise value is greater than or equal to the second noise threshold and less than the first noise threshold, noise reduction is required and the noise severity is relatively low. Therefore, adjusting the compressor frequency and the opening of the electronic expansion valve can meet the noise reduction requirements.

[0009] In the specific implementation of the control method for the air conditioner described above, before the step of "selectively adjusting the frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan based on the real-time noise value, or adjusting the frequency of the compressor and the opening degree of the electronic expansion valve," the control method further includes: acquiring the real-time frequency value of the compressor and recording the real-time frequency value as a reference frequency value; acquiring the real-time opening degree value of the electronic expansion valve and recording the real-time opening degree value as a reference opening degree value; acquiring the real-time speed value of the outdoor fan and recording the real-time speed value as a reference speed value; determining a first frequency adjustment range and a second frequency adjustment range based on the reference frequency value; determining a first opening degree adjustment range and a second opening degree adjustment range based on the reference opening degree value; and determining a speed adjustment range based on the reference speed value. The step of "adjusting the frequency of the compressor, the opening of the electronic expansion valve, and the speed of the outdoor fan" further includes: adjusting the frequency of the compressor within the first frequency adjustment range, adjusting the opening of the electronic expansion valve within the first opening adjustment range, and adjusting the speed of the outdoor fan within the speed adjustment range; the step of "adjusting the frequency of the compressor and the opening of the electronic expansion valve" further includes: adjusting the frequency of the compressor within the second frequency adjustment range, and adjusting the opening of the electronic expansion valve within the second opening adjustment range; wherein, the reference frequency value is simultaneously within the first frequency adjustment range and the second frequency adjustment range, the reference opening value is simultaneously within the first opening adjustment range and the second opening adjustment range, and the reference speed value is within the speed adjustment range.

[0010] By adopting the above technical solution, the adjustable values ​​of the compressor frequency, the opening degree of the electronic expansion valve, and the speed of the outdoor fan are limited to a certain range, which can reduce noise while minimizing the impact on the cooling or heating effect.

[0011] In a specific implementation of the control method for the aforementioned air conditioner, the steps of "adjusting the frequency of the compressor within the first frequency adjustment range, adjusting the opening of the electronic expansion valve within the first opening adjustment range, and adjusting the speed of the outdoor fan within the speed adjustment range" further include: controlling the compressor to decrease to a target frequency value at a set first rate; controlling the speed of the outdoor fan to decrease to a target speed value; and controlling the opening of the electronic expansion valve to decrease to a target opening value; wherein the target frequency value is within the first frequency adjustment range, the target opening value is within the first opening adjustment range, and the target speed value is within the speed adjustment range.

[0012] When the above technical solution is adopted, if the real-time noise value is large, noise reduction is required, and the noise severity is relatively high, the compressor frequency is first controlled to be quickly reduced to the target frequency value, the opening of the electronic expansion valve is controlled to be reduced to the target opening value, and the speed of the outdoor fan is controlled to be reduced to the target speed value, so as to quickly reduce noise.

[0013] In a specific implementation of the control method for the air conditioner described above, after the step of "controlling the opening of the electronic expansion valve to decrease to the target opening value", the control method further includes: determining again whether the real-time noise value is greater than or equal to the first noise threshold; if the real-time noise value is greater than or equal to the first noise threshold, controlling the compressor to increase its frequency to the reference frequency value; controlling the speed of the outdoor fan to the lower limit of the speed adjustment range; controlling the outdoor fan to increase its speed at a set second rate; if the real-time speed value is less than or equal to the upper limit of the speed adjustment range, and if the real-time noise value is less than the first noise threshold, controlling the outdoor fan to stop increasing its speed; wherein, the first speed threshold is less than the second speed threshold.

[0014] If the above steps do not achieve the noise reduction effect when the above technical solution is adopted, the compressor frequency is adjusted to the reference frequency value, and the speed of the outdoor fan is controlled to increase within the first speed adjustment range in order to find the speed that can reduce the real-time noise value to below the first noise threshold. If it is found, this speed is maintained to achieve the noise reduction effect.

[0015] In a specific implementation of the control method for the aforementioned air conditioner, after the step of "controlling the outdoor fan to increase its speed at a set second rate", the control method further includes: if the real-time speed value is greater than the upper limit of the speed adjustment range, controlling the speed of the outdoor fan to the target speed value; controlling the frequency of the compressor to the lower limit of the first frequency adjustment range; controlling the compressor to increase its frequency at a set third rate; and if the real-time noise value is less than the first noise threshold when the real-time frequency value is less than or equal to the upper limit of the first frequency adjustment range, controlling the compressor to stop increasing its frequency.

[0016] When the above technical solution is adopted, if the fan speed is increased to outside the first speed adjustment range and no speed that can reduce noise is found, the speed of the outdoor fan is controlled to the target speed value, and the frequency of the compressor is controlled to increase within the first frequency adjustment range in order to find a frequency that can reduce the real-time noise value to below the first noise threshold. If it is found, this frequency is maintained to achieve the noise reduction effect.

[0017] In a specific implementation of the control method for the air conditioner described above, after the step of "controlling the compressor to increase its frequency at a set third rate", the control method further includes: if the real-time frequency value is greater than the upper limit of the first frequency adjustment range, then controlling the frequency of the compressor to decrease to a set minimum allowable frequency value and controlling the speed of the outdoor fan to decrease to a set minimum allowable speed value or controlling the air conditioner to stop; simultaneously with or after the step of "controlling the frequency of the compressor to decrease to a set minimum allowable frequency value and controlling the speed of the outdoor fan to decrease to a set minimum allowable speed value or controlling the air conditioner to stop", the control method further includes: issuing a reminder message to alert the user of abnormal noise reduction.

[0018] If, when using the above technical solution, a speed and frequency that can reduce the real-time noise value below the first noise threshold cannot be found, the compressor frequency will be reduced to the minimum allowable frequency value, and the outdoor fan speed will be reduced to the minimum allowable speed value or the air conditioner will be shut down. This prevents the compressor and outdoor fan from operating under high noise conditions for extended periods, which could lead to component damage, effectively improving the lifespan of the air conditioner and reducing energy consumption. Furthermore, a reminder message will be issued to alert the user to any noise reduction abnormalities, allowing the user to handle the situation accordingly and ensuring the continued use of the air conditioner.

[0019] In a specific implementation of the control method for the air conditioner described above, the steps of "adjusting the frequency of the compressor within the second frequency adjustment range and adjusting the opening of the electronic expansion valve within the second opening adjustment range" further include: controlling the compressor to reduce its frequency at a set fourth rate; and adjusting the opening of the electronic expansion valve within the second opening adjustment range according to the real-time frequency value.

[0020] When the above technical solution is adopted, when the real-time noise value is low and noise reduction is required but the noise severity is relatively low, the compressor frequency is controlled to decrease at a low rate to prevent excessive noise in advance. Then, the opening of the electronic expansion valve is controlled to decrease according to the real-time frequency value to match the decrease in refrigerant circulation caused by the decrease in compressor frequency, thereby preventing the overheating from rising rapidly, ensuring the cooling or heating effect and preventing damage to the compressor.

[0021] In a specific embodiment of the control method for the aforementioned air conditioner, before the step of "adjusting the opening of the electronic expansion valve within the second opening adjustment range according to the real-time frequency value," the control method further includes: determining whether the real-time frequency value is greater than or equal to the lower limit of the second frequency adjustment range; the step of "adjusting the opening of the electronic expansion valve within the second opening adjustment range according to the real-time frequency value" further includes: if the real-time frequency value is greater than or equal to the lower limit of the second frequency adjustment range, then adjusting the opening of the electronic expansion valve within the second opening adjustment range according to the real-time frequency value; after the step of "adjusting the opening of the electronic expansion valve within the second opening adjustment range according to the real-time frequency value," the control method further includes: determining whether the real-time noise value is less than the second noise threshold; if the real-time noise value is less than the second noise threshold, then stopping the adjustment of the compressor frequency and the opening of the electronic expansion valve.

[0022] When the above technical solution is adopted, if the compressor frequency is not reduced to outside the second frequency adjustment range, and a frequency that can make the real-time noise value less than the second noise threshold is found, the current frequency and opening degree are maintained.

[0023] In a specific implementation of the control method for the aforementioned air conditioner, after the step of "determining whether the real-time frequency value is greater than or equal to the lower limit of the second frequency adjustment range", the control method further includes: if the real-time frequency is less than the lower limit of the second frequency adjustment range, controlling the frequency of the compressor to the reference frequency value; controlling the compressor to increase its frequency at a set fourth rate; determining whether the real-time frequency value is less than or equal to the upper limit of the second frequency adjustment range; if the real-time frequency value is less than or equal to the upper limit of the second frequency adjustment range, adjusting the opening of the electronic expansion valve again within the second opening adjustment range according to the real-time frequency value; determining again whether the real-time noise value is less than the second noise threshold; if the real-time noise value is less than the second noise threshold, stopping the adjustment of the compressor frequency and the opening of the electronic expansion valve.

[0024] When the compressor frequency is reduced to outside the second frequency adjustment range and no frequency is found that can make the real-time noise value less than the second noise threshold, the compressor frequency is controlled to the reference frequency value and then increased again to continue to find a frequency that can reduce the real-time frequency value, thereby achieving the effect of reducing noise.

[0025] Compared to existing technologies, the beneficial effects of the air conditioner control method provided by this invention are as follows: When the real-time noise level is relatively high, in order to reduce damage to the moving parts of the air conditioner, it is necessary to quickly reduce the noise. Therefore, by adjusting the compressor frequency, the opening of the electronic expansion valve, and the speed of the outdoor fan, noise can be reduced quickly and efficiently, thereby reducing damage to the moving parts, increasing the service life of the air conditioner, and reducing energy consumption. Research has found that when the real-time noise level is relatively low, the noise is mainly generated by the compressor, and the outdoor fan has little impact on the noise. Therefore, when the real-time noise level is relatively low, adjusting the compressor frequency and the opening of the electronic expansion valve can reduce the noise, thus preventing excessive noise in advance. At the same time, without adjusting the speed of the outdoor fan, the heat exchange efficiency of the air conditioner can be guaranteed, reducing the impact on the cooling or heating effect. Thus, while ensuring the cooling or heating effect of the air conditioner, the noise reduction effect can also be improved. Attached Figure Description

[0026] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which: Figure 1 This is a flowchart of the main steps of the air conditioner control method of the present invention; Figure 2 This is a detailed flowchart of one embodiment of the control method for an air conditioner according to the present invention; Figure 3 This is a detailed flowchart of another embodiment of the control method for an air conditioner according to the present invention; Figure 4 This is a detailed flowchart of the third embodiment of the air conditioner control method of the present invention. Detailed Implementation

[0027] Some embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0028] It should be noted that, in the description of this invention, unless otherwise stated, "a plurality of" means two or more. Furthermore, ordinal numbers such as "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. The term "A and / or B" represents all possible combinations of A and B, such as only A, only B, or A and B.

[0029] Furthermore, it should be noted that although the steps of the control method of the present invention are described in a specific order in the description of the present invention, these orders are not restrictive. Without departing from the basic principles of the present invention, those skilled in the art can perform the steps in different orders.

[0030] See Figures 1-4 This invention provides a control method for an air conditioner, such as... Figure 1 As shown in the figure, this diagram illustrates the main steps of the control method for the air conditioner of the present invention. The control method in this embodiment mainly includes the following steps: Step S101: Obtain the real-time noise level of the outdoor unit; Step S102: Based on the real-time noise value, selectively adjust the compressor frequency, the opening of the electronic expansion valve, and the speed of the outdoor fan, or adjust the compressor frequency and the opening of the electronic expansion valve.

[0031] Through the control method described in steps S101 to S102 above, when the real-time noise value is relatively high, in order to reduce damage to the moving parts of the air conditioner, it is necessary to quickly reduce the noise. Therefore, by adjusting the compressor frequency, the opening of the electronic expansion valve, and the speed of the outdoor fan, noise can be reduced quickly and efficiently, thereby reducing damage to the moving parts, improving the service life of the air conditioner, and reducing energy consumption. Research has found that when the real-time noise value is relatively low, the noise is mainly generated by the compressor, and the outdoor fan has little impact on the noise. Therefore, when the real-time noise value is relatively low, adjusting the compressor frequency and the opening of the electronic expansion valve can reduce the noise and prevent excessive noise in advance. At the same time, without adjusting the speed of the outdoor fan, the heat exchange efficiency of the air conditioner can be guaranteed, reducing the impact on the cooling or heating effect. Thus, the cooling or heating effect of the air conditioner can be guaranteed while the noise reduction effect can be improved.

[0032] like Figure 2 As shown in the figure, this embodiment of the control method for an air conditioner according to the present invention specifically includes the following steps: Step S201: Obtain the real-time noise value of the outdoor unit.

[0033] Step S202: Obtain the real-time frequency value of the compressor and record this real-time frequency value as the reference frequency value.

[0034] Step S203: Obtain the real-time opening value of the electronic expansion valve and record the real-time opening value at this time as the reference opening value.

[0035] Step S204: Obtain the real-time speed value of the outdoor fan and record the real-time speed value at this time as the reference speed value.

[0036] It should be noted that the execution order of steps S201 to S204 can be the order described above, or it can be adjusted as needed.

[0037] Step S205: Determine the first frequency adjustment range and the second frequency adjustment range based on the reference frequency value.

[0038] The reference frequency value falls within both the first and second frequency adjustment ranges.

[0039] Step S206: Based on the reference opening value, determine the first opening adjustment range and the second opening adjustment range.

[0040] The reference opening value is simultaneously within the first opening adjustment range and the second opening adjustment range.

[0041] Step S207: Determine the speed adjustment range based on the reference speed value.

[0042] The reference speed value is within the speed adjustment range.

[0043] It should be noted that the execution order of steps S205 to S207 can be the order described above, or can be adjusted arbitrarily as needed.

[0044] Step S208: Determine whether the real-time noise value is greater than or equal to the first noise threshold. If the determination is yes, proceed to step S209; if the determination is no, proceed to step S210.

[0045] Step S209: Adjust the compressor frequency within the first frequency adjustment range, adjust the opening of the electronic expansion valve within the first opening adjustment range, and adjust the outdoor fan speed within the speed adjustment range.

[0046] Since noise reduction is required when the real-time noise level is greater than or equal to the first noise threshold, and the noise severity is relatively high, the compressor frequency, the opening degree of the electronic expansion valve, and the outdoor fan speed are adjusted. Limiting the adjustable values ​​of the compressor frequency, the opening degree of the electronic expansion valve, and the outdoor fan speed within a certain range can reduce noise while minimizing the impact on cooling or heating performance.

[0047] It should be noted that the specific values ​​of the first frequency adjustment range, the first opening adjustment range, and the speed adjustment range can be relatively fixed values ​​or values ​​that vary with the noise level; this invention does not impose specific limitations. For example, the first frequency adjustment range can be within ±10Hz centered on the reference frequency value, the first opening adjustment range can be within ±60 steps centered on the reference opening, and the speed adjustment range can be within ±150rpm centered on the reference speed.

[0048] Step S210: Determine whether the real-time noise value is greater than or equal to the second noise threshold and less than the first noise threshold. If the determination is yes, proceed to step S211; if the determination is no, proceed to step S201.

[0049] The first noise threshold and the second noise threshold can be relatively fixed values, or different values ​​can be selected according to the working mode of the air conditioner. This invention does not make specific limitations. For example, the first noise threshold can be 45dB to 60dB, and the second noise threshold can be 35dB to 45dB.

[0050] Step S211: Adjust the compressor frequency within the second frequency adjustment range, and adjust the opening of the electronic expansion valve within the second opening adjustment range.

[0051] Since noise reduction is required when the real-time noise value is greater than or equal to the second noise threshold and less than the first noise threshold, and the noise severity is relatively low, adjusting the compressor frequency and the opening of the electronic expansion valve can meet the noise reduction requirements.

[0052] It should be noted that the specific values ​​of the second frequency adjustment range and the second opening adjustment range can be relatively fixed values ​​or values ​​that vary with the noise level; this invention does not impose specific limitations. The value range of the second frequency adjustment range can be smaller than that of the first frequency adjustment range, and the value range of the second opening adjustment range can be smaller than that of the first opening adjustment range, so that when the real-time noise level is relatively low, the compressor frequency and the opening of the electronic expansion valve can be adjusted within a smaller range, further reducing the impact on the cooling or heating effect. For example, the second frequency adjustment range can be within ±5Hz centered on the reference frequency value, and the first opening adjustment range can be within ±40 steps centered on the reference opening.

[0053] By using the control methods described in steps S201 to S211, noise reduction can be improved while ensuring the cooling or heating effect of the air conditioner.

[0054] like Figure 3 As shown, the steps of "adjusting the compressor frequency within the first frequency adjustment range, adjusting the opening of the electronic expansion valve within the first opening adjustment range, and adjusting the outdoor fan speed within the speed adjustment range" can further include the following steps: Step S301: Control the compressor to reduce to the target frequency value at a first rate.

[0055] The first rate can be a relatively fixed value, or it can be selected according to the magnitude of the real-time noise value; this invention does not specifically limit this value. The first rate can be a relatively fast value to quickly reduce noise; for example, the first rate can be a value in the range of 2Hz / s to 3Hz / s. The target frequency value is within the first frequency adjustment range and is less than the reference frequency value. The magnitude of the target frequency value can be a relatively fixed value, or it can be selected according to the magnitude of the real-time noise value, or it can be a randomly selected value; this invention does not specifically limit this value. For example, the target frequency value can be the reference frequency value - 8Hz, or it can be the reference frequency value - 6Hz.

[0056] Step S302: Control the outdoor fan speed to decrease to the target speed value.

[0057] The target speed value is within the first speed adjustment range and is less than the reference speed value. The target speed value can be a relatively fixed value, or it can be determined according to the real-time noise value, or it can be a randomly selected value. This invention does not impose any specific limitations. For example, the target speed value can be the reference speed value -100 rpm or the reference speed value -80 rpm.

[0058] It should be noted that step S302 can be performed simultaneously with step S301, or they can be performed sequentially. Those skilled in the art can make adjustments as needed.

[0059] Step S303: Control the opening of the electronic expansion valve to decrease to the target opening value.

[0060] The target opening value is within the first opening adjustment range and is less than the reference opening value. The target opening value can be a relatively fixed value, or it can be determined according to the real-time frequency value, or it can be a randomly selected value. This invention does not impose any specific limitations. For example, the target opening value can be the reference opening value - 30 steps, or it can be the reference opening value - 20 steps.

[0061] It should be noted that step S303 can be performed after step S301 or step S302. It can be executed immediately after step S301 or step S302, or it can be executed after waiting for a period of time after step S301 or step S302.

[0062] Step S304: Determine again whether the real-time noise value is greater than or equal to the first noise threshold. If the determination result is yes, proceed to step S305; if the determination result is no, proceed to step S312.

[0063] Step S305: Control the compressor to increase its frequency to the reference frequency value.

[0064] Step S306: Control the speed of the outdoor fan to the lower limit of the speed adjustment range.

[0065] Step S307: Control the outdoor fan to increase its speed at the set second rate.

[0066] The second rate can be a relatively fixed value, or it can be selected according to the magnitude of the real-time noise value. This invention does not specifically limit it; for example, the second rate can be 20 rpm / s.

[0067] Step S308: Determine whether the real-time speed value is less than or equal to the upper limit of the speed adjustment range. If the determination result is yes, proceed to step S309; ​​if the determination result is no, proceed to step S313.

[0068] Step S309: Determine whether the real-time noise value is less than the first noise threshold. If the determination result is yes, proceed to step S310; if the determination result is no, proceed to step S307.

[0069] Step S310: Control the outdoor fan to stop increasing its speed.

[0070] If the noise reduction effect is not achieved through the above steps S301 to S303, the compressor frequency is adjusted to the reference frequency value, and the speed of the outdoor fan is controlled to increase within the first speed adjustment range in order to find the speed that can reduce the real-time noise value to below the first noise threshold. If it is found, this speed is maintained to achieve the noise reduction effect.

[0071] Step S311: Adjust the opening of the electronic expansion valve within the first opening adjustment range according to the real-time frequency value.

[0072] Step S312: Stop adjusting the compressor frequency, the opening of the electronic expansion valve, and the speed of the outdoor fan.

[0073] Step S313: Control the speed of the outdoor fan to the target speed value.

[0074] Step S314: Control the compressor frequency to the lower limit of the first frequency adjustment range.

[0075] Step S315: Control the compressor to increase the frequency at the third rate.

[0076] The third rate can be a relatively fixed value, or it can be selected according to the working mode of the air conditioner. The present invention does not make a specific limitation. For example, the third rate can be 1Hz / s to 2Hz / s.

[0077] Step S316: Determine whether the real-time frequency value is less than or equal to the upper limit of the first frequency adjustment range. If the determination result is yes, proceed to step S317; if the determination result is no, proceed to step S318.

[0078] Step S317: Make a third judgment on whether the real-time noise value is greater than or equal to the first noise threshold. If the judgment result is yes, proceed to step S315; if the judgment result is no, proceed to step S320.

[0079] If the fan speed is increased to outside the first speed adjustment range and no speed that can reduce noise is found, the outdoor fan speed is controlled to the target speed value, and the compressor frequency is controlled to increase within the first frequency adjustment range to find a frequency that can reduce the real-time noise value to below the first noise threshold. If a frequency is found, this frequency is maintained to achieve the noise reduction effect.

[0080] Step S318: Control the compressor frequency to decrease to the set minimum allowable frequency value and control the outdoor fan speed to decrease to the set minimum allowable speed value or control the air conditioner to stop.

[0081] The minimum permissible frequency value refers to the minimum continuous operating frequency that the compressor can operate stably under the condition of meeting system safety and functional requirements, which is preset in the air conditioner; the minimum permissible speed value refers to the minimum continuous operating speed that the outdoor fan can operate stably under the condition of meeting system safety and functional requirements, which is preset in the air conditioner.

[0082] Step S319: Issue a reminder message.

[0083] If no speed and frequency can be found that can reduce the real-time noise value below the first noise threshold, the compressor and outdoor fan will be controlled to operate at a reduced speed or the air conditioner will be shut down. This prevents moving parts such as the compressor and outdoor fan from running under high noise conditions for a long time, which could lead to component damage. This effectively improves the service life of the air conditioner and reduces energy consumption. Furthermore, a reminder message will be issued to alert the user that there is an abnormality in noise reduction, so that the user can handle the situation accordingly, find the cause of the inability to reduce noise, and ensure the continued use of the air conditioner.

[0084] It should be noted that the form of the "reminder message" can include, but is not limited to, voice messages, text messages, and light-related messages; the entity issuing the reminder message can include, but is not limited to, air conditioners and terminal devices; the specific reminder method can be any combination of the above reminder forms and entities, as long as it can effectively remind the user. Those skilled in the art can choose according to the specific needs of the actual application, and no specific limitations are made here. Specifically, voice messages can be delivered to the user via voice broadcast or a buzzer; text messages can be delivered to the user via a pop-up floating window or scrolling playback; light-related messages can be lights that are on for a long time or intermittently. The above reminder methods are only illustrative examples, and can be selected according to actual needs in practical applications.

[0085] Step S320: Control the compressor to stop increasing frequency.

[0086] Through the control method of steps S301 to S320 above, a real-time method is provided that "the frequency of the compressor is adjusted within the first frequency adjustment range, the opening of the electronic expansion valve is adjusted within the first opening adjustment range, and the speed of the outdoor fan is adjusted within the speed adjustment range" is provided, so as to find the speed of the outdoor fan and the frequency of the compressor that reduce the real-time noise value, thereby improving the noise reduction effect while ensuring the cooling or heating effect of the air conditioner.

[0087] like Figure 4 As shown, the step of "adjusting the compressor frequency within the second frequency adjustment range and adjusting the opening of the electronic expansion valve within the second opening adjustment range" can further include the following steps: Step S401: Control the compressor to reduce frequency at the fourth rate.

[0088] Step S402: Determine whether the real-time frequency value is greater than or equal to the lower limit of the second frequency adjustment range. If the determination result is yes, proceed to step S403; if the determination result is no, proceed to step S406.

[0089] Step S403: Adjust the opening of the electronic expansion valve within the second opening adjustment range according to the real-time frequency value.

[0090] Step S403 enables the opening degree of the electronic expansion valve to match the reduction in refrigerant circulation caused by the decrease in compressor frequency, thereby preventing a rapid increase in superheat, ensuring cooling or heating performance, and preventing damage to the compressor.

[0091] Step S404: Determine whether the real-time noise value is less than the second noise threshold. If the determination result is yes, proceed to step S405; if the determination result is no, proceed to step S401.

[0092] Step S405: Stop adjusting the compressor frequency and the opening of the electronic expansion valve.

[0093] Step S406: Control the compressor frequency to the reference frequency value.

[0094] Step S407: Control the compressor to increase the frequency at the fourth rate.

[0095] The fourth rate can be a relatively fixed value, or it can be selected according to the working mode of the air conditioner. The present invention does not specifically limit it; for example, the fourth rate can be in the range of 0.5 Hz / s to 2 Hz / s.

[0096] Step S408: Determine whether the real-time frequency value is less than or equal to the upper limit of the second frequency adjustment range. If the determination result is yes, proceed to step S409; if the determination result is no, proceed to step S411.

[0097] Step S409: Adjust the opening of the electronic expansion valve again within the second opening adjustment range according to the real-time frequency value.

[0098] Step S410: Determine again whether the real-time noise value is less than the second noise threshold. If the determination result is yes, proceed to step S405; if the determination result is no, proceed to step S407.

[0099] Step S411: Control the compressor frequency to the reference frequency value and control the opening degree of the electronic expansion valve to the reference opening degree value.

[0100] In step S411, when noise reduction is not possible, the compressor and electronic expansion valve are controlled to return to their initial parameters so that the noise of the air conditioner is kept at a relatively low level.

[0101] Through the control method of steps S401 to S411 above, a specific real-time method is given to "adjust the compressor frequency within the second frequency adjustment range and adjust the opening of the electronic expansion valve within the second opening adjustment range", so as to improve the noise reduction effect while ensuring the cooling or heating effect of the air conditioner.

[0102] It should be noted that the above embodiments are merely used to illustrate the principles of the present invention and are not intended to limit the scope of protection of the present invention. Without departing from the principles of the present invention, those skilled in the art can adjust the above embodiments so that the present invention can be applied to more specific application scenarios.

[0103] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles 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 scope of protection of the present invention.

Claims

1. A control method for an air conditioner, characterized in that, The control method includes: Obtain the real-time noise level of the outdoor unit; Based on the real-time noise value, the compressor frequency, the opening degree of the electronic expansion valve, and the speed of the outdoor fan are selectively adjusted, or the compressor frequency and the opening degree of the electronic expansion valve are adjusted, to reduce the noise of the air conditioner.

2. The control method for an air conditioner according to claim 1, characterized in that, The step of "selectively adjusting the compressor frequency, the opening degree of the electronic expansion valve, and the speed of the outdoor fan based on the real-time noise value, or adjusting the compressor frequency and the opening degree of the electronic expansion valve" further includes: If the real-time noise value is greater than or equal to the set first noise threshold, then adjust the frequency of the compressor, the opening of the electronic expansion valve, and the speed of the outdoor fan. If the real-time noise value is greater than or equal to the set second noise threshold and less than the first noise threshold, then the frequency of the compressor and the opening of the electronic expansion valve are adjusted.

3. The control method for an air conditioner according to claim 2, characterized in that, Before the step of "selectively adjusting the compressor frequency, the opening degree of the electronic expansion valve, and the speed of the outdoor fan based on the real-time noise value, or adjusting the compressor frequency and the opening degree of the electronic expansion valve," the control method further includes: Obtain the real-time frequency value of the compressor and record the real-time frequency value at this time as the reference frequency value; Obtain the real-time opening value of the electronic expansion valve and record the real-time opening value at this time as the reference opening value; Obtain the real-time rotational speed of the outdoor fan and record the real-time rotational speed as the reference rotational speed. Based on the reference frequency value, a first frequency adjustment range and a second frequency adjustment range are determined; Based on the aforementioned reference opening value, a first opening adjustment range and a second opening adjustment range are determined; Based on the reference speed value, the speed adjustment range is determined; The step of "adjusting the frequency of the compressor, the opening degree of the electronic expansion valve, and the speed of the outdoor fan" further includes: The frequency of the compressor is adjusted within the first frequency adjustment range, the opening of the electronic expansion valve is adjusted within the first opening adjustment range, and the speed of the outdoor fan is adjusted within the speed adjustment range. The step of "adjusting the frequency of the compressor and the opening degree of the electronic expansion valve" further includes: The frequency of the compressor is adjusted within the second frequency adjustment range, and the opening of the electronic expansion valve is adjusted within the second opening adjustment range; Wherein, the reference frequency value is simultaneously within the first frequency adjustment range and the second frequency adjustment range, the reference opening value is simultaneously within the first opening adjustment range and the second opening adjustment range, and the reference speed value is within the speed adjustment range.

4. The control method for an air conditioner according to claim 3, characterized in that, The steps of "adjusting the frequency of the compressor within the first frequency adjustment range, adjusting the opening of the electronic expansion valve within the first opening adjustment range, and adjusting the speed of the outdoor fan within the speed adjustment range" further include: The compressor is controlled to decrease to a target frequency value at a set first rate; Control the outdoor fan speed to reduce to the target speed value; Control the opening degree of the electronic expansion valve to decrease to the target opening degree value; Wherein, the target frequency value is within the first frequency adjustment range, the target opening value is within the first opening adjustment range, and the target rotational speed value is within the rotational speed adjustment range.

5. The control method for an air conditioner according to claim 4, characterized in that, After the step of "controlling the opening of the electronic expansion valve to decrease to the target opening value", the control method further includes: It is then determined whether the real-time noise value is greater than or equal to the first noise threshold; If the real-time noise value is greater than or equal to the first noise threshold, then control the compressor to increase its frequency to the reference frequency value; Control the speed of the outdoor fan to the lower limit of the speed adjustment range; Control the outdoor fan to increase its speed at a set second rate; If the real-time rotational speed value is less than or equal to the upper limit of the rotational speed adjustment range, and if the real-time noise value is less than the first noise threshold, then the outdoor fan is controlled to stop increasing its speed. Wherein, the first speed threshold is less than the second speed threshold.

6. The control method for an air conditioner according to claim 5, characterized in that, Following the step of "controlling the outdoor fan to increase its speed at a set second rate", the control method further includes: If the real-time speed value is greater than the upper limit of the speed adjustment range, then the speed of the outdoor fan is controlled to the target speed value; Control the frequency of the compressor to the lower limit of the first frequency adjustment range; The compressor is controlled to increase its frequency at a set third rate; If the real-time frequency value is less than or equal to the upper limit of the first frequency adjustment range, and if the real-time noise value is less than the first noise threshold, then the compressor is controlled to stop increasing the frequency.

7. The control method for an air conditioner according to claim 6, characterized in that, Following the step of "controlling the compressor to increase its frequency at a set third rate", the control method further includes: If the real-time frequency value is greater than the upper limit of the first frequency adjustment range, then control the compressor frequency to be reduced to the set minimum allowable frequency value and control the outdoor fan speed to be reduced to the set minimum allowable speed value or control the air conditioner to stop. Simultaneously or after the steps of "controlling the compressor frequency to decrease to a set minimum permissible frequency value and controlling the outdoor fan speed to decrease to a set minimum permissible speed value or controlling the air conditioner to stop," the control method further includes: Send a notification message to alert the user to an abnormal noise cancellation issue.

8. The control method for an air conditioner according to claim 3, characterized in that, The step of "adjusting the frequency of the compressor within the second frequency adjustment range and adjusting the opening of the electronic expansion valve within the second opening adjustment range" further includes: The compressor is controlled to reduce its frequency at a set fourth rate; The opening of the electronic expansion valve is adjusted within the second opening adjustment range based on the real-time frequency value.

9. The control method for an air conditioner according to claim 8, characterized in that, Before the step of "adjusting the opening of the electronic expansion valve within the second opening adjustment range according to the real-time frequency value", the control method further includes: Determine whether the real-time frequency value is greater than or equal to the lower limit of the second frequency adjustment range; The step of "adjusting the opening of the electronic expansion valve within the second opening adjustment range according to the real-time frequency value" further includes: If the real-time frequency value is greater than or equal to the lower limit of the second frequency adjustment range, then the opening of the electronic expansion valve is adjusted within the second opening adjustment range according to the real-time frequency value. Following the step of "adjusting the opening of the electronic expansion valve within the second opening adjustment range based on the real-time frequency value," the control method further includes: Determine whether the real-time noise value is less than the second noise threshold; If the real-time noise value is less than the second noise threshold, then the adjustment of the compressor frequency and the opening of the electronic expansion valve will stop.

10. The control method for an air conditioner according to claim 9, characterized in that, After the step of "determining whether the real-time frequency value is greater than or equal to the lower limit of the second frequency adjustment range", the control method further includes: If the real-time frequency is less than the lower limit of the second frequency adjustment range, then the frequency of the compressor is controlled to the reference frequency value; Control the compressor to increase its frequency at a set fourth rate; Determine whether the real-time frequency value is less than or equal to the upper limit of the second frequency adjustment range; If the real-time frequency value is less than or equal to the upper limit of the second frequency adjustment range, then the opening of the electronic expansion valve is adjusted again within the second opening adjustment range according to the real-time frequency value. It is then determined whether the real-time noise value is less than the second noise threshold; If the real-time noise value is less than the second noise threshold, then the adjustment of the compressor frequency and the opening of the electronic expansion valve will stop.

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