Control method and device for air conditioner, air conditioner, and storage medium

Abstract

The application relates to the technical field of air conditioners, and discloses a control method for an air conditioner, which comprises the following steps: acquiring a motor rotating speed and a motor rotating speed change trend; determining a fluctuation range of a carrier frequency according to the motor rotating speed and the motor rotating speed change trend; and controlling a frequency converter to randomly take values in the fluctuation range and periodically adjust the carrier frequency. The application can avoid fixed operation of the carrier frequency of the frequency converter, and can make the carrier frequency randomly fluctuate within a reasonable range, so that the suppression of air conditioner noise and the suppression of frequency converter loss can be considered, and the resonance phenomenon of the motor and the frequency converter can be avoided, thereby being beneficial to improving the stability of air conditioner operation. The application also discloses a control device for an air conditioner, an air conditioner and a storage medium.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioners, for example to a control method and device for an air conditioner, an air conditioner and a storage medium. BACKGROUND

[0002] At present, with the improvement of people's living standards, the working requirements of air conditioners are also getting higher and higher. Among them, the noise problem in the running process of the air conditioner is particularly prominent. The noise of the air conditioner can be divided into mechanical noise and electromagnetic noise, and the electromagnetic noise is greatly related to the switching process of the frequency converter. Based on this, the related technology proposes a control method for the carrier frequency of an air conditioner, including: acquiring the compressor speed of the air conditioner in real time; comparing the compressor speed with a preset speed; if the compressor speed is lower than the preset speed, setting the carrier frequency of the air conditioner as a first preset carrier frequency; and if the compressor speed is higher than or equal to the preset speed, setting the carrier frequency of the air conditioner as a second preset carrier frequency; wherein the second preset carrier frequency is greater than the first preset carrier frequency.

[0003] The related technology adopts a low carrier frequency when the compressor speed is low, reduces the opening and closing loss of the module, and reduces the heating of the module; adopts a high carrier frequency when the compressor speed is high, reduces the compressor noise, reduces the heating of the compressor, and improves the control performance and stability of the system.

[0004] In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related technology:

[0005] The frequency converter in the related technology works at a fixed carrier frequency for a period of time, and the PWM (Pulse Width Modulation) will generate high-frequency current harmonics near the switching frequency in the motor current waveform. The air gap magnetic field generated by these high-frequency current harmonics will further act with other air gap harmonics to generate high-frequency electromagnetic force, which will cause high-frequency electromagnetic vibration and noise. And when the harmonic frequency of these electromagnetic forces is consistent with the frequency of the motor mechanical structure, resonance phenomenon will occur, bringing greater noise, which is not conducive to the stability of the air conditioner operation.

[0006] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present application, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0007] In order to have a basic understanding of some aspects of the disclosed embodiments, the following is a simple summary. The summary is not a general review, nor is it intended to determine the key / important components or delineate the scope of protection of these embodiments, but as a prelude to the detailed description below.

[0008] The control method, device and air conditioner provided by the embodiments of the present disclosure can balance the suppression of the noise of the air conditioner and the suppression of the loss of the frequency converter, and can avoid the resonance phenomenon of the motor, thereby improving the stability of the operation of the air conditioner.

[0009] In some embodiments, the method comprises: obtaining the motor speed and the motor speed change trend; determining the fluctuation range of the carrier frequency according to the motor speed and the motor speed change trend; and controlling the frequency converter to randomly take values within the fluctuation range and periodically adjust the carrier frequency.

[0010] In some embodiments, the device comprises: a processor and a memory storing program instructions, wherein the processor is configured to execute the control method for the air conditioner described above when running the program instructions.

[0011] In some embodiments, the air conditioner comprises: an air conditioner body provided with a motor and a frequency converter; and the control device for the air conditioner described above is installed on the air conditioner body.

[0012] In some embodiments, the storage medium stores program instructions, and the program instructions execute the control method for the air conditioner described above when running.

[0013] The control method, device and air conditioner for the air conditioner provided by the embodiments of the present disclosure can achieve the following technical effects:

[0014] In the embodiments of the present disclosure, the motor speed and the motor speed change trend are obtained to grasp the current operation condition of the air conditioner, and the fluctuation range of the carrier frequency is set according to the current operation condition, so as to control the frequency converter to randomly take values within the fluctuation range and periodically adjust the carrier frequency. Thus, the carrier frequency of the frequency converter is prevented from being fixedly operated, and the carrier frequency is randomly fluctuated within a reasonable range, so that the suppression of the noise of the air conditioner and the suppression of the loss of the frequency converter can be balanced, and the resonance phenomenon of the motor and the frequency converter can be avoided, thereby improving the stability of the operation of the air conditioner.

[0015] The foregoing general description and the following description are only exemplary and explanatory, and are not intended to limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0016] One or more embodiments are exemplarily illustrated by corresponding drawings, which do not constitute a limitation on the embodiments, and elements with the same reference numerals in the drawings are shown as similar elements, the drawings do not constitute a proportional limitation, and wherein:

[0017] Figure 1 is a schematic diagram of a control method for an air conditioner provided by the embodiments of the present disclosure;

[0018] Figure 2 is another schematic diagram of a control method for an air conditioner provided by an embodiment of the present disclosure;

[0019] Figure 3 is another schematic diagram of a control method for an air conditioner provided by an embodiment of the present disclosure;

[0020] Figure 4 is another schematic diagram of a control method for an air conditioner provided by an embodiment of the present disclosure;

[0021] Figure 5 is a schematic diagram of a control device for an air conditioner provided by an embodiment of the present disclosure;

[0022] Figure 6 is a schematic diagram of an air conditioner provided by an embodiment of the present disclosure. DETAILED DESCRIPTION

[0023] In order to enable a person skilled in the art to more fully understand the features and technical contents of the embodiments of the present disclosure, the implementation of the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings, which are used only for reference and are not intended to limit the embodiments of the present disclosure. In the following technical description, in order to facilitate explanation, a plurality of details are provided to provide a full understanding of the disclosed embodiments. However, one or more embodiments can still be implemented without these details. In other cases, well-known structures and devices can be simplified to facilitate the drawings.

[0024] The terms "first", "second", and the like in the specification and claims of the embodiments of the present disclosure and the above drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present disclosure described herein can be implemented. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0025] Unless otherwise specified, the term "a plurality of" means two or more.

[0026] In the embodiments of the present disclosure, the character " / " represents an "or" relationship between the preceding and following objects. For example, A / B represents: A or B.

[0027] The term "and / or" is a description of the association relationship between objects, which means that there can be three relationships. For example, A and / or B means: A or B, or, A and B, the three relationships.

[0028] The term "corresponding" can refer to an association relationship or a binding relationship, A corresponding to B means that there is an association relationship or a binding relationship between A and B.

[0029] Currently, with the improvement of people's living standards, the working requirements for air conditioners are also getting higher and higher. Among them, the noise problem during the operation of the air conditioner is particularly prominent. The noise of the air conditioner can be divided into mechanical noise and electromagnetic noise, and the electromagnetic noise is greatly related to the switching process of the frequency converter. Based on this, the related technology proposes a control method for the carrier frequency of an air conditioner, comprising: acquiring the compressor speed of the air conditioner in real time; comparing the compressor speed with the preset speed; if the compressor speed is lower than the preset speed, the carrier frequency of the air conditioner is set to a first preset carrier frequency; and if the compressor speed is higher than or equal to the preset speed, the carrier frequency of the air conditioner is set to a second preset carrier frequency; wherein the second preset carrier frequency is greater than the first preset carrier frequency.

[0030] The related technology adopts a low carrier frequency when the compressor speed is low, reduces the opening and closing loss of the module, and reduces the heating of the module; when the compressor speed is high, a high carrier frequency is adopted, which reduces the compressor noise, reduces the heating of the compressor, and improves the control performance and stability of the system.

[0031] However, the frequency converter in the related technology works at a fixed carrier frequency for a period of time, and the PWM will generate high-frequency current harmonics near the switching frequency in the motor current waveform. The air gap magnetic field generated by these high-frequency current harmonics will further act with other air gap harmonics to generate high-frequency electromagnetic force, which will cause high-frequency electromagnetic vibration and noise. And when the harmonic frequency of these electromagnetic forces is consistent with the resonance frequency of the motor mechanical structure, it will cause greater noise.

[0032] In combination with Figure 1 The embodiment of the present disclosure provides a control method for an air conditioner, comprising:

[0033] In S101, the processor acquires the motor speed and the motor speed change trend.

[0034] In S102, the processor determines the fluctuation range of the carrier frequency according to the motor speed and the motor speed change trend.

[0035] In S103, the processor controls the frequency converter to randomly take values within the fluctuation range and periodically adjust the carrier frequency.

[0036] By adopting the control method for an air conditioner provided by the embodiment of the present disclosure, the current running condition of the air conditioner is grasped by acquiring the motor speed and the motor speed change trend, and the fluctuation range of the carrier frequency is set accordingly, so as to control the frequency converter to randomly take values within the fluctuation range and periodically adjust the carrier frequency. Therefore, the embodiment of the present disclosure can avoid the fixed operation of the carrier frequency of the frequency converter, and make the carrier frequency randomly fluctuate within a reasonable range, so as to balance the suppression of air conditioner noise and the suppression of frequency converter loss, and avoid the resonance phenomenon between the motor and the frequency converter, which is beneficial to improve the stability of the air conditioner operation.

[0037] Optionally, the processor determines the fluctuation range of the carrier frequency according to the motor speed and the motor speed change trend, including: the processor determines a speed threshold according to the motor speed change trend; and the processor determines the fluctuation range of the carrier frequency according to the motor speed and the speed threshold. In this way, the disclosed embodiment can set a suitable speed threshold in combination with the motor speed change trend, and determine the fluctuation range of the carrier frequency by comparing the motor speed with the speed threshold, so that the value of the carrier frequency can be consistent with the actual operation condition of the motor, which is conducive to taking into account the suppression of the noise of the air conditioner and the suppression of the inverter loss.

[0038] Optionally, the processor determines the speed threshold according to the motor speed change trend, including: in the case that the motor speed change trend represents an increase in speed, the processor determines the speed threshold as a first speed threshold; or in the case that the motor speed change trend represents a decrease in speed, the processor determines the speed threshold as a second speed threshold. The first speed threshold is greater than the second speed threshold. In this way, for the case of motor speed increase, the disclosed embodiment sets a slightly larger first speed threshold, which gives a certain rising margin to ensure that the motor speed can accurately reach the target speed, which is conducive to more accurately distinguishing the low speed and high speed states under the condition of motor speed increase. For the case of motor speed decrease, the disclosed embodiment sets a slightly smaller second speed threshold, which gives a certain falling margin to ensure that the motor speed can accurately reach the target speed, which is conducive to more accurately distinguishing the low speed and high speed states under the condition of motor speed decrease.

[0039] Optionally, in the case that the motor speed change trend represents an increase in speed, the processor determines the fluctuation range of the carrier frequency according to the motor speed and the speed threshold, including: in the case that the motor speed is less than the first speed threshold, the processor determines the fluctuation range of the carrier frequency as a first fluctuation range; or in the case that the motor speed is greater than or equal to the first speed threshold, the processor determines the fluctuation range of the carrier frequency as a second fluctuation range. In this way, by comparing the size relationship between the motor speed and the first speed threshold, the disclosed embodiment can distinguish the low speed and high speed states under the condition of motor speed increase, and accordingly set the corresponding first fluctuation range and second fluctuation range. Therefore, the disclosed embodiment can take into account the differences in inverter loss and air conditioner noise under different speed states under the condition of speed increase, and by randomly taking values and periodically adjusting the carrier frequency within the corresponding fluctuation range, the suppression of the noise of the air conditioner and the suppression of the inverter loss can be taken into account.

[0040] Optionally, in a case where the motor speed change trend indicates a speed reduction, the processor determines a fluctuation range of the carrier frequency according to the motor speed and the speed threshold, including: in a case where the motor speed is less than a second speed threshold, the processor determines the fluctuation range of the carrier frequency as a third fluctuation range; or in a case where the motor speed is greater than or equal to the second speed threshold, the processor determines the fluctuation range of the carrier frequency as a fourth fluctuation range. In this way, by comparing the motor speed with the second speed threshold, the disclosed embodiment can distinguish between low speed and high speed states in the case of motor speed reduction, and accordingly set the corresponding third fluctuation range and fourth fluctuation range. Thus, the disclosed embodiment can take into account the differences in inverter loss and air conditioner noise problems corresponding to different speed states in the case of speed reduction, and by randomly selecting the carrier frequency within the corresponding fluctuation range and periodically adjusting it, the air conditioner noise suppression and inverter loss suppression can be taken into account.

[0041] Optionally, the processor controls the inverter to randomly select and periodically adjust the carrier frequency within the fluctuation range, including: every interval of a preset period, the processor randomly selects a target carrier frequency within the fluctuation range; and the processor controls the switching frequency of the power module of the inverter to respond to the target carrier frequency. In this way, the disclosed embodiment can randomly adjust the current carrier frequency within the fluctuation range every interval of a preset period, thereby achieving dynamic adjustment of the switching frequency of the power module, so as to avoid the problem of motor resonance caused by the fixed operation of the carrier frequency of the inverter, and to improve the stability of the air conditioner operation.

[0042] Optionally, the power module of the inverter is an IGBT (Insulated Gate Bipolar Transistor). The power module can also be other power switching devices that can achieve similar functions, and the disclosed embodiment does not make specific limitations thereto. Based on the randomly selected target carrier frequency, the disclosed embodiment can adjust the switching frequency of the IGBT, thereby being able to control the switching times of the IGBT within the corresponding period. The higher the switching frequency, the more the switching times of the IGBT, the better the smoothness of the current waveform, the less the heating of the motor, and the smaller the motor noise, but the greater the electromagnetic interference to other devices, and the switching loss of the IGBT increases, which may affect the normal operation of the air conditioner. The smaller the switching frequency, the fewer the switching times of the IGBT, so the switching loss can be effectively reduced, but the noise reduction effect is poor, which is not conducive to the suppression of air conditioner noise. The disclosed embodiment randomly selects the target carrier frequency within the fluctuation range and adaptively adjusts the switching frequency of the IGBT, which can take into account the suppression of air conditioner noise and the suppression of inverter loss, so as to ultimately achieve a smaller air conditioner noise, a smaller inverter switching loss, a better smoothness of the current waveform, and effectively reduce the electromagnetic interference to other devices.

[0043] Optionally, the preset period can be set in combination with motor-related parameters to better avoid resonance between the motor and the frequency converter. Preferably, the preset period is 2 ms. The preset period can also be adjusted according to actual user needs, and set to 1 ms or 5 ms or other arbitrary values within a reasonable range.

[0044] Optionally, the motor can be a compressor motor, and the frequency converter is used to adjust the rotation speed and operation frequency of the compressor. The motor can also be a fan motor, and the frequency converter is used to adjust the rotation speed of the fan. The present disclosure does not make specific limitations on this.

[0045] In combination with Figure 2 As shown in the accompanying drawings, the present disclosure provides another control method for an air conditioner, comprising:

[0046] S201, the processor acquires the motor rotation speed and the motor rotation speed change trend.

[0047] S202, in the case where the motor rotation speed change trend indicates an increase in speed, the processor determines the rotation speed threshold to be a first rotation speed threshold.

[0048] S203, in the case where the motor rotation speed is less than the first rotation speed threshold, the processor determines the fluctuation range of the carrier frequency to be a first fluctuation range.

[0049] S204, in the case where the motor rotation speed is greater than or equal to the first rotation speed threshold, the processor determines the fluctuation range of the carrier frequency to be a second fluctuation range.

[0050] S205, in the case where the motor rotation speed change trend indicates a decrease in speed, the processor determines the rotation speed threshold to be a second rotation speed threshold.

[0051] S206, in the case where the motor rotation speed is less than the second rotation speed threshold, the processor determines the fluctuation range of the carrier frequency to be a third fluctuation range.

[0052] S207, in the case where the motor rotation speed is greater than or equal to the second rotation speed threshold, the processor determines the fluctuation range of the carrier frequency to be a fourth fluctuation range.

[0053] S208, the processor controls the frequency converter to randomly take values within the fluctuation range and periodically adjust the carrier frequency.

[0054] The control method for the air conditioner provided by the embodiment of the present disclosure can grasp the current operation condition of the air conditioner by obtaining the motor speed and the motor speed change trend, set a suitable speed threshold in combination with the motor speed change trend, and then determine the fluctuation range of the carrier frequency by comparing the motor speed with the speed threshold, so as to control the frequency converter to randomly take values and periodically adjust the carrier frequency in the suitable fluctuation range. Thus, the embodiment of the present disclosure can avoid the fixed operation of the carrier frequency of the frequency converter, and make the carrier frequency randomly fluctuate in a reasonable range, so as to give consideration to the suppression of the noise of the air conditioner and the suppression of the loss of the frequency converter, and avoid the resonance phenomenon between the motor and the frequency converter, which is beneficial to improving the stability of the operation of the air conditioner.

[0055] Optionally, the first speed threshold and the second speed threshold can be set in combination with a preset speed threshold. The first speed threshold is greater than the preset speed threshold, and the second speed threshold is less than the preset speed threshold. Preferably, the preset speed threshold is 500 rpm. In this way, when the motor is accelerated, the first speed threshold greater than the preset speed threshold is set, the embodiment of the present disclosure can give a certain rising margin to ensure that the motor speed can accurately reach the target speed, which is beneficial to more accurately distinguishing the low speed and high speed states under the motor acceleration condition, and then can more accurately limit the fluctuation range of the carrier frequency in combination with the actual motor speed condition. When the motor is decelerated, the second speed threshold smaller than the preset speed threshold is set, the embodiment of the present disclosure can give a certain falling margin to ensure that the motor speed can accurately reach the target speed, which is beneficial to more accurately distinguishing the low speed and high speed states under the motor deceleration condition, and also can more accurately limit the fluctuation range of the carrier frequency in combination with the actual motor speed condition.

[0056] Optionally, the first speed threshold can be adjusted according to the motor acceleration rate. When the motor accelerates faster, the first speed threshold can be set a little larger to give a more suitable rising margin, which is beneficial to more accurately limiting the fluctuation range of the carrier frequency. Preferably, the first speed threshold is 560 rpm. The first speed threshold can also be adjusted according to the actual needs of the user, and adjusted to other arbitrary values in a reasonable range.

[0057] Optionally, the second speed threshold can be adjusted according to the motor deceleration rate. When the motor decelerates faster, the second speed threshold can be set a little smaller to give a more suitable falling margin, which is beneficial to more accurately limiting the fluctuation range of the carrier frequency. Preferably, the second speed threshold is 440 rpm. The second speed threshold can also be adjusted according to the actual needs of the user, and adjusted to other arbitrary values in a reasonable range.

[0058] Optionally, the first fluctuation range is different from the second fluctuation range. In this way, for the low speed and high speed states of the motor speed-up case, the embodiment of the present disclosure fully considers the differences in the inverter loss and the air conditioner noise in the two states, and by respectively setting different carrier frequency fluctuation ranges, the air conditioner noise and the inverter loss can be more accurately suppressed. Preferably, the upper limit value of the first fluctuation range is less than the upper limit value of the second fluctuation range, and the lower limit value of the first fluctuation range is less than the lower limit value of the second fluctuation range. In this way, for the noise problem that is more prominent in the high speed state, the embodiment of the present disclosure can set the second fluctuation range with a relatively larger carrier frequency value, thereby facilitating better suppression of the air conditioner noise problem. And for the low speed state, the noise problem is not prominent, and the embodiment of the present disclosure sets the first fluctuation range with a relatively smaller carrier frequency value, thereby facilitating better suppression of the inverter loss. Thus, the embodiment of the present disclosure can take into account the suppression of the air conditioner noise and the suppression of the inverter loss, and is beneficial to improve the stability of the air conditioner operation.

[0059] Optionally, the third fluctuation range is different from the fourth fluctuation range. In this way, for the low speed and high speed states of the motor speed-down case, the embodiment of the present disclosure fully considers the differences in the inverter loss and the air conditioner noise in the two states, and by respectively setting different carrier frequency fluctuation ranges, the air conditioner noise and the inverter loss can be more accurately suppressed. Preferably, the upper limit value of the third fluctuation range is less than the upper limit value of the fourth fluctuation range, and the lower limit value of the third fluctuation range is less than the lower limit value of the fourth fluctuation range. In this way, for the noise problem that is more prominent in the high speed state, the embodiment of the present disclosure can set the fourth fluctuation range with a relatively larger carrier frequency value, thereby facilitating better suppression of the air conditioner noise problem. And for the low speed state, the noise problem is not prominent, and the embodiment of the present disclosure sets the third fluctuation range with a relatively smaller carrier frequency value, thereby facilitating better suppression of the inverter loss. Thus, the embodiment of the present disclosure can take into account the suppression of the air conditioner noise and the suppression of the inverter loss, and is beneficial to improve the stability of the air conditioner operation.

[0060] Optionally, the first fluctuation range is the same as the third fluctuation range. In this way, the embodiment of the present disclosure can simplify the control, which is beneficial to reduce the implementation difficulty and control cost of the control.

[0061] Optionally, the second fluctuation range is the same as the fourth fluctuation range. In this way, the embodiment of the present disclosure can simplify the control, which is beneficial to reduce the implementation difficulty and control cost of the control.

[0062] Optionally, the first fluctuation range can be adjusted according to the detected real-time noise of the air conditioner. The upper limit value and the lower limit value of the first fluctuation range are positively correlated with the noise decibel value. When the air conditioner noise decibel value is larger, the upper limit value and the lower limit value of the first fluctuation range can be set slightly higher, so that the random value of the carrier frequency is relatively larger, which is conducive to better inhibiting the air conditioner noise problem. Preferably, the first fluctuation range is [14KHz, 18KHz]. The first fluctuation range can also be adjusted according to the actual needs of the user, and adjusted to other arbitrary reasonable ranges.

[0063] Optionally, the second fluctuation range can be adjusted according to the detected real-time temperature of the power module. The upper limit value and the lower limit value of the second fluctuation range are negatively correlated with the power module temperature value. When the power module temperature value of the frequency converter is higher, the upper limit value and the lower limit value of the second fluctuation range can be set slightly lower, so that the random value of the carrier frequency is relatively smaller, which is conducive to better inhibiting the frequency converter loss. Preferably, the second fluctuation range is [18KHz, 22KHz]. The second fluctuation range can also be adjusted according to the actual needs of the user, and adjusted to other arbitrary reasonable ranges.

[0064] Optionally, the third fluctuation range can be adjusted according to the detected real-time noise of the air conditioner. The upper limit value and the lower limit value of the third fluctuation range are positively correlated with the noise decibel value. When the air conditioner noise decibel value is larger, the upper limit value and the lower limit value of the third fluctuation range can be set slightly higher, so that the random value of the carrier frequency is relatively larger, which is conducive to better inhibiting the air conditioner noise problem. Preferably, the third fluctuation range is [14KHz, 18KHz]. The third fluctuation range can also be adjusted according to the actual needs of the user, and adjusted to other arbitrary reasonable ranges.

[0065] Optionally, the fourth fluctuation range can be adjusted according to the detected real-time temperature of the power module. The upper limit value and the lower limit value of the fourth fluctuation range are negatively correlated with the power module temperature value. When the power module temperature value of the frequency converter is higher, the upper limit value and the lower limit value of the fourth fluctuation range can be set slightly lower, so that the random value of the carrier frequency is relatively smaller, which is conducive to better inhibiting the frequency converter loss. Preferably, the fourth fluctuation range is [18KHz, 22KHz]. The fourth fluctuation range can also be adjusted according to the actual needs of the user, and adjusted to other arbitrary reasonable ranges.

[0066] In combination Figure 3 As shown in FIG. 8, the embodiment of the present disclosure provides another control method for an air conditioner, comprising:

[0067] S301, the processor acquires the motor speed and the motor speed change trend.

[0068] S302, the processor determines the fluctuation range of the carrier frequency according to the motor speed and the motor speed change trend.

[0069] S303, the processor controls the frequency converter to randomly take values within the fluctuation range and periodically adjust the carrier frequency.

[0070] S304, the processor calculates an average value of the carrier frequency randomly taken within a preset time length to obtain an average carrier frequency.

[0071] S305, the processor adjusts the value strategy of the carrier frequency according to the average carrier frequency and the reference carrier frequency corresponding to the fluctuation range.

[0072] By adopting the control method for the air conditioner provided in the embodiments of the present disclosure, the current running condition of the air conditioner is grasped by obtaining the motor speed and the motor speed change trend, and the fluctuation range of the carrier frequency is set accordingly to control the frequency converter to randomly take values within the fluctuation range and periodically adjust the carrier frequency. Thus, the embodiments of the present disclosure can avoid the carrier frequency of the frequency converter to run fixedly, and make the carrier frequency randomly fluctuate within a reasonable range, so as to be able to take into account the suppression of the noise of the air conditioner and the suppression of the loss of the frequency converter, and to avoid the resonance phenomenon between the motor and the frequency converter, which is beneficial to improve the stability of the air conditioner running. In addition, when the carrier frequency continuously changes within the fluctuation range for a preset time length, the embodiments of the present disclosure calculate the average value of the carrier frequency randomly taken within the preset time length, and compare it with the reference carrier frequency corresponding to the fluctuation range, so that the embodiments of the present disclosure can judge whether the random value of the carrier frequency within the preset time length is appropriate, and then optimize the value strategy of the carrier frequency according to the judgment result, so as to facilitate to protect the stability of the subsequent running process of the air conditioner.

[0073] Optionally, the preset time length can be set in combination with the related parameters of the frequency converter, so as to more timely suppress the loss of the frequency converter. Preferably, the preset time length is 1s. The preset time length can also be adjusted according to the actual needs of the user, and set to other arbitrary values within a reasonable range such as 0.5s or 2s.

[0074] Optionally, the processor calculates the average value of the carrier frequency randomly taken within the preset time length to obtain the average carrier frequency, including that the processor calculates obtaining the average carrier frequency wherein, X i is the carrier frequency of the i-th random value, and n is the random value number of the carrier frequency within the preset time length, which can be obtained by comparing the preset time length with the preset period. In this way, the embodiments of the present disclosure can accurately obtain the average value of the carrier frequency randomly taken within the preset time length, which is beneficial to judge whether the random value of the carrier frequency within the preset time length is appropriate.

[0075] Optionally, the processor determines the reference carrier frequency corresponding to the fluctuation range in the following manner, including that the processor calculates X a = (X max + X min) / 2, to obtain a reference carrier frequency X corresponding to the fluctuation range a . Wherein, X max is an upper limit value of the fluctuation range, and X min is a lower limit value of the fluctuation range. In this way, the reference carrier frequency of the fluctuation range is the average value of the upper limit value and the lower limit value of the fluctuation range, that is, the disclosed embodiment fluctuates within the fluctuation range around the reference carrier frequency. The reference carrier frequency can reflect the size of the random value of the carrier frequency, the larger the reference carrier frequency, the relatively larger the random value of the carrier frequency, which is conducive to better inhibiting the noise problem of the air conditioner. The smaller the reference carrier frequency, the relatively smaller the random value of the carrier frequency, which is conducive to better inhibiting the inverter loss.

[0076] Optionally, the processor adjusts the value strategy of the carrier frequency according to the average carrier frequency and the reference carrier frequency corresponding to the fluctuation range, including: in the case that the average carrier frequency is less than the reference carrier frequency corresponding to the fluctuation range, the processor maintains the current value strategy of the carrier frequency; or in the case that the average carrier frequency is greater than or equal to the reference carrier frequency corresponding to the fluctuation range, the processor corrects the current value strategy of the carrier frequency. In this way, when the average carrier frequency is less than the reference carrier frequency corresponding to the fluctuation range, it indicates that the random value of the carrier frequency within the preset time period is reasonable, which can well balance the inhibition of the air conditioner noise and the inhibition of the inverter loss. Therefore, the disclosed embodiment maintains the current value strategy of the carrier frequency to ensure the stability of the subsequent running process of the air conditioner. When the average carrier frequency is greater than or equal to the reference carrier frequency corresponding to the fluctuation range, it indicates that the random value of the carrier frequency within the preset time period is too large, at this time the inverter temperature rise is large, the loss amount of its power module is large, which may affect the normal operation of the air conditioner. In order to inhibit the inverter loss and avoid the unexpected shutdown of the air conditioner, the disclosed embodiment timely corrects the current value strategy of the carrier frequency to ensure the stability of the subsequent running process of the air conditioner. Therefore, by comparing the average carrier frequency and the reference carrier frequency corresponding to the fluctuation range, the disclosed embodiment can judge whether the random value of the carrier frequency within the preset time period is appropriate, and then can optimize the value strategy of the carrier frequency according to the judgment result, so as to facilitate the stability of the subsequent running process of the air conditioner.

[0077] Optionally, the disclosed embodiment can also introduce a correction coefficient to more accurately adjust the value strategy of the carrier frequency. Specifically, in the case that the average carrier frequency is less than the product of the reference carrier frequency and the correction coefficient, the processor maintains the current value strategy of the carrier frequency. In the case that the average carrier frequency is greater than or equal to the product of the reference carrier frequency and the correction coefficient, the processor corrects the current value strategy of the carrier frequency. In this way, the disclosed embodiment can adjust the trigger difficulty of the value correction scheme of the carrier frequency, which is conducive to optimizing the value strategy of the carrier frequency in combination with the actual working condition, so as to facilitate the stability of the subsequent running process of the air conditioner.

[0078] Optionally, the correction coefficient a can be set according to the detected real-time temperature of the power module. When the temperature of the power module of the frequency converter is relatively high, the correction coefficient a can be set to be slightly lower, so as to more easily trigger the value correction scheme of the carrier frequency, and to facilitate the timely suppression of the loss of the frequency converter, so as to guarantee the stability of the subsequent operation process of the air conditioner. Preferably, the correction coefficient a is 1.00. The correction coefficient a can also be adjusted according to the actual needs of the user, and set to be 0.95 or 1.05 or other arbitrary values in a reasonable range.

[0079] In combination with Figure 4 The embodiment of the present disclosure provides another control method for an air conditioner, which comprises the following steps:

[0080] S401, the processor acquires the motor speed and the motor speed change trend.

[0081] S402, the processor determines the fluctuation range of the carrier frequency according to the motor speed and the motor speed change trend.

[0082] S403, the processor controls the frequency converter to randomly take values in the fluctuation range and periodically adjust the carrier frequency.

[0083] S404, the processor calculates the average value of the randomly taken carrier frequencies in a preset time length, and obtains the average carrier frequency.

[0084] S405, in the case that the average carrier frequency is less than the reference carrier frequency corresponding to the fluctuation range, the processor maintains the current value strategy of the carrier frequency.

[0085] S406, in the case that the average carrier frequency is greater than or equal to the reference carrier frequency corresponding to the fluctuation range, the processor corrects the current value strategy of the carrier frequency.

[0086] The control method for the air conditioner provided by the embodiment of the present disclosure can grasp the current operation condition of the air conditioner by obtaining the motor speed and the motor speed change trend, and set the fluctuation range of the carrier frequency according to the current operation condition, so as to control the frequency converter to randomly take values in the fluctuation range and periodically adjust the carrier frequency. Thus, the embodiment of the present disclosure can avoid the fixed operation of the carrier frequency of the frequency converter, and make the carrier frequency randomly fluctuate in a reasonable range, so as to balance the suppression of the air conditioner noise and the suppression of the frequency converter loss, and avoid the resonance phenomenon between the motor and the frequency converter, which is beneficial to improve the stability of the air conditioner operation. In addition, when the carrier frequency continuously changes in the fluctuation range for a preset time length, the embodiment of the present disclosure calculates the average value of the carrier frequency randomly taken in the preset time length, and compares the average value with the reference carrier frequency corresponding to the fluctuation range, so that the embodiment of the present disclosure can judge whether the random taking of the carrier frequency in the preset time length is appropriate. If the average carrier frequency is less than the reference carrier frequency corresponding to the fluctuation range, the random taking of the carrier frequency in the preset time length is more reasonable, which can well balance the suppression of the air conditioner noise and the suppression of the frequency converter loss. Therefore, the embodiment of the present disclosure maintains the current taking strategy of the carrier frequency to ensure the stability of the subsequent operation process of the air conditioner. If the average carrier frequency is greater than or equal to the reference carrier frequency corresponding to the fluctuation range, the random taking of the carrier frequency in the preset time length is too large, at this time, the temperature rise of the frequency converter is large, the loss amount of the power module thereof is large, which may affect the normal operation of the air conditioner. In order to suppress the frequency converter loss and avoid the unexpected shutdown of the air conditioner, the embodiment of the present disclosure timely corrects the current taking strategy of the carrier frequency to ensure the stability of the subsequent operation process of the air conditioner.

[0087] Optionally, the processor corrects the current taking strategy of the carrier frequency, including: the processor determines a taking correction scheme according to the motor speed and the motor speed change trend; and the processor corrects the current taking strategy of the carrier frequency according to the taking correction scheme. In this way, when the average carrier frequency is greater than or equal to the reference carrier frequency corresponding to the fluctuation range, the air conditioner runs less stably. The embodiment of the present disclosure can grasp the motor condition in combination with the motor speed and the motor speed change trend, so as to select a more appropriate taking correction scheme according to the motor condition, so as to better suppress the air conditioner noise and the frequency converter loss, which is beneficial to further improve the stability of the air conditioner operation.

[0088] Optionally, the value correction scheme comprises: the processor controls the carrier frequency to take values randomly in a new fluctuation range and to be adjusted periodically. In this way, when the average carrier frequency is greater than or equal to the reference carrier frequency corresponding to the fluctuation range, the air conditioner is less stable. The embodiment of the disclosure controls the carrier frequency to take values randomly in a new more suitable fluctuation range and to be adjusted periodically, and can adaptively reduce the random value of the carrier frequency, so as to avoid the overheating of the power module and the increase of the switching loss caused by the increase of the temperature rise of the frequency converter. Therefore, by setting a new suitable fluctuation range, the embodiment of the disclosure can further inhibit the loss of the frequency converter when the air conditioner is less stable, which is beneficial to improving the stability of the subsequent operation process of the air conditioner.

[0089] Optionally, the processor determines the new fluctuation range in the following manner: the processor determines the upper limit value, the lower limit value and the reference carrier frequency corresponding to the new fluctuation range according to the difference between the average carrier frequency corresponding to the fluctuation range and the reference carrier frequency. The difference and the upper limit value, the lower limit value and the reference carrier frequency corresponding to the new fluctuation range are in a negative correlation relationship. In this way, the embodiment of the disclosure can determine the instability degree of the air conditioner according to the difference between the average carrier frequency corresponding to the original fluctuation range and the reference carrier frequency. The greater the difference, the greater the temperature rise of the frequency converter, the greater the loss of the power module, and the greater the possibility of accidental shutdown of the air conditioner. At this time, in order to more timely inhibit the loss of the frequency converter and avoid the accidental shutdown of the air conditioner, the embodiment of the disclosure sets a smaller carrier frequency fluctuation range to improve the stability of the subsequent operation process of the air conditioner.

[0090] Optionally, the value correction scheme comprises: the processor controls the carrier frequency to take values randomly in a new fluctuation range and to be adjusted periodically. In this way, when the average carrier frequency is greater than or equal to the reference carrier frequency corresponding to the fluctuation range, the air conditioner is less stable. The embodiment of the disclosure controls the carrier frequency to take values randomly in a new more suitable fluctuation range and to be adjusted periodically, and can adaptively reduce the random value of the carrier frequency, so as to avoid the overheating of the power module and the increase of the switching loss caused by the increase of the temperature rise of the frequency converter. Therefore, by setting a new suitable fluctuation range, the embodiment of the disclosure can further inhibit the loss of the frequency converter when the air conditioner is less stable, which is beneficial to improving the stability of the subsequent operation process of the air conditioner.

[0091] Optionally, the processor determines the fixed carrier frequency in the following manner: the processor determines the fixed carrier frequency according to a difference between the average carrier frequency corresponding to the fluctuation range and the reference carrier frequency. The difference is negatively correlated with the fixed carrier frequency. In this way, the disclosed embodiment can determine the instability degree of the air conditioner according to the difference between the average carrier frequency corresponding to the original fluctuation range and the reference carrier frequency. The greater the difference, the greater the temperature rise of the frequency converter, the greater the power module loss, and the greater the possibility of air conditioner shutdown. At this time, in order to more timely suppress the loss of the frequency converter and avoid air conditioner shutdown, the disclosed embodiment sets a smaller fixed carrier frequency to improve the stability of the subsequent operation of the air conditioner.

[0092] Optionally, the processor determines the value correction scheme of the carrier frequency according to the motor speed and the motor speed change trend, including: in the case that the motor speed change trend indicates speed-up and the motor speed is less than a first speed threshold, determining that the value correction scheme is a first correction scheme; or in the case that the motor speed change trend indicates speed-up and the motor speed is greater than or equal to the first speed threshold, determining that the value correction scheme is a second correction scheme; or in the case that the motor speed change trend indicates speed-down and the motor speed is less than a second speed threshold, determining that the value correction scheme is a third correction scheme; or in the case that the motor speed change trend indicates speed-down and the motor speed is greater than or equal to the second speed threshold, determining that the value correction scheme is a fourth correction scheme. In this way, the disclosed embodiment can consider the differences in frequency converter loss and air conditioner noise problems corresponding to different speed change trends and different speed states, and select a more appropriate value correction scheme to better suppress air conditioner noise and frequency converter loss, which is conducive to further improving the stability of the air conditioner.

[0093] Optionally, the first correction scheme is to control the carrier frequency to operate according to a first fixed carrier frequency. In this way, when the motor speed change trend indicates speed-up and the motor speed is less than the first speed threshold, the acceleration is too fast in the speed-up state, and in order to ensure the stability of the air conditioner, the disclosed embodiment adopts a more direct fixed carrier frequency operation to more quickly suppress the loss of the frequency converter, which is conducive to ensuring the stability of the subsequent operation of the air conditioner. And since the motor speed is less than the first speed threshold, high-frequency resonance phenomenon is not easy to occur, so the air conditioner noise problem is not prominent.

[0094] Optionally, the second correction scheme is to control the carrier frequency to take a value randomly in a fifth fluctuation range and to be adjusted periodically. In this way, when the motor speed change trend indicates an increase in speed and the motor speed is greater than or equal to a first speed threshold, the motor speed is too large, the high-frequency resonance phenomenon is prone to occur, the air conditioner noise problem is more prominent, and the acceleration is too fast in the case of an increase in speed, and the air conditioner is unstable in operation. The embodiment of the present disclosure selects a more appropriate fifth fluctuation range to randomly take a value and periodically adjust the carrier frequency, so as to better suppress the inverter loss and avoid the resonance phenomenon between the motor and the inverter, which is conducive to ensuring the stability of the subsequent operation process of the air conditioner.

[0095] Optionally, the third correction scheme is to control the carrier frequency to take a value randomly in a fifth fluctuation range and to be adjusted periodically. In this way, when the motor speed change trend indicates a decrease in speed and the motor speed is less than a second speed threshold, the acceleration is too slow in the case of a decrease in speed, the motor speed is too small, and the air conditioner is stable in operation. Since the motor speed is less than the second speed threshold, the air conditioner noise problem and the inverter loss problem are not obvious, so the embodiment of the present disclosure does not need to achieve the rapid reduction of the carrier frequency by fixing the carrier frequency. By selecting a more appropriate fifth fluctuation range to randomly take a value and periodically adjust the carrier frequency, the embodiment of the present disclosure can take into account the suppression of the air conditioner noise and the suppression of the inverter loss, which is conducive to ensuring the stability of the subsequent operation process of the air conditioner.

[0096] Optionally, the fourth correction scheme is to control the carrier frequency to take a value randomly in a fifth fluctuation range and to be adjusted periodically. In this way, when the motor speed change trend indicates a decrease in speed and the motor speed is greater than or equal to a second speed threshold, the motor speed is too large, the high-frequency resonance phenomenon is prone to occur, the air conditioner noise problem is more prominent, and the air conditioner is unstable in operation. The embodiment of the present disclosure selects a more appropriate fifth fluctuation range to randomly take a value and periodically adjust the carrier frequency, so as to better suppress the inverter loss and avoid the resonance phenomenon between the motor and the inverter, which is conducive to ensuring the stability of the subsequent operation process of the air conditioner.

[0097] Preferably, the first fixed carrier frequency is equal to the reference carrier frequency corresponding to the first fluctuation range. Specifically, the first fixed carrier frequency is 16KHz, and the first fixed carrier frequency can also be adjusted according to the actual needs of the user to be any value within a reasonable range. In this way, the embodiment of the present disclosure controls the carrier frequency to run fixedly according to the reference carrier frequency corresponding to the first fluctuation range, which can quickly realize the reduction of the carrier frequency value, so as to better avoid the overheating of the power module and the increase in the switching loss caused by the increase in the temperature of the inverter. Therefore, by setting a suitable first fixed carrier frequency, the embodiment of the present disclosure can more quickly suppress the inverter loss in the case of unstable operation of the air conditioner, which is conducive to improving the stability of the subsequent operation process of the air conditioner.

[0098] Preferably, the fifth fluctuation range corresponds to a reference carrier frequency X a5 is equal to X a1 , the upper limit value X max5 of the fifth fluctuation range satisfies X max5 -X a5 =(X max1 -X a1 ) / 2, and the lower limit value X min5 of the fifth fluctuation range satisfies X a5 -X min5 =(X a1 -X min1 ) / 2. Wherein, X a1 is the reference carrier frequency corresponding to the first fluctuation range, X max1 is the upper limit value corresponding to the first fluctuation range, and X min1 is the lower limit value corresponding to the first fluctuation range. Specifically, the fifth fluctuation range is [15KHz, 17KHz], and the fifth fluctuation range can also be adjusted according to actual user needs to be any reasonable range. In this way, the disclosed embodiment controls the carrier frequency to take a value randomly in the fifth fluctuation range and to be adjusted periodically, so as to be able to adjust the reference carrier frequency corresponding to the fluctuation range to a lower level, so as to make the random value of the carrier frequency relatively smaller, so as to avoid the power module overheating and the switching loss increasing caused by the temperature rise of the frequency converter, and to be beneficial to better inhibit the loss of the frequency converter. And by adjusting the upper limit value and the lower limit value corresponding to the fluctuation range, the size of the fifth fluctuation range is reduced to half of the original fluctuation range, so as to be able to make the random value of the carrier frequency further close to the reference carrier frequency, and also to be able to avoid the carrier frequency value being too large and to be beneficial to inhibit the loss of the frequency converter. Thus, by setting a suitable fifth fluctuation range, the disclosed embodiment can better inhibit the loss of the frequency converter in the case that the air conditioner runs less stably, and is beneficial to improve the stability of the subsequent running process of the air conditioner.

[0099] Optionally, in the embodiments of the present disclosure, the adjustment process of the carrier frequency value strategy involved in steps S404 to S406 is not limited to being performed once. After entering step S405, the processor maintains the current value strategy of the carrier frequency, and after a preset time period, it can return to perform step S404, the processor re-calculates the average value of the randomly valued carrier frequency in the preset time period, obtains a new average carrier frequency, and based on the judgment result, selects to further perform step S405 or step S406 again. Alternatively, after entering step S406, the processor corrects the current value strategy of the carrier frequency, and after a preset time period, it can return to perform step S404, the processor re-calculates the average value of the randomly valued carrier frequency in the preset time period, obtains a new average carrier frequency, and based on the judgment result, selects to further perform step S405 or step S406 again. In this way, the embodiments of the present disclosure can cyclically perform steps S404 to S406 during the operation of the air conditioner, and by comparing the average carrier frequency and the reference carrier frequency corresponding to the fluctuation range multiple times, the periodic adjustment of the carrier frequency value strategy can be realized, which is beneficial to guarantee the stability of the air conditioner during the entire operation.

[0100] In combination with Figure 5 As shown in FIG. 5, the embodiments of the present disclosure provide a control device 500 for an air conditioner, which includes a processor 501 and a memory 502. Optionally, the device can also include a communication interface 503 and a bus 504. Wherein the processor 501, the communication interface 503, and the memory 502 can complete mutual communication through the bus 504. The communication interface 503 can be used for information transmission. The processor 501 can invoke the logical instructions in the memory 502 to execute the control method for the air conditioner of the above-mentioned embodiments.

[0101] In addition, the logical instructions in the memory 502 described above can be implemented in the form of a software functional unit and sold or used as an independent product, which can be stored in a computer readable storage medium.

[0102] The memory 502 as a computer readable storage medium can be used to store software programs, computer executable programs, such as program instructions / modules corresponding to the method in the embodiments of the present disclosure. The processor 501 executes the function application and data processing by running the program instructions / modules stored in the memory 502, that is, implements the control method for the air conditioner in the above-mentioned embodiments.

[0103] The memory 502 can include a program storage area and a data storage area, wherein the program storage area can store an operating system, an application program required by at least one function; and the data storage area can store data created according to use of the terminal device, etc. In addition, the memory 502 can include a high-speed random access memory, and can also include a nonvolatile memory.

[0104] In combination Figure 6 As shown in the drawings, the embodiment of the present disclosure provides an air conditioner 600, comprising: an air conditioner body, and the control device 500 for the air conditioner described above. The air conditioner body is provided with a motor and a frequency converter. The control device 500 for the air conditioner is installed on the air conditioner body. The installation relationship described herein is not limited to placing in the product, but also includes installation connection with other components of the product, including but not limited to physical connection, electrical connection or signal transmission connection, etc. Those skilled in the art can understand that the control device 500 for the air conditioner can be adapted to the feasible product body, and then realize other feasible embodiments.

[0105] The embodiment of the present disclosure provides a computer readable storage medium, which stores computer executable instructions, and the computer executable instructions are set to execute the control method for the air conditioner.

[0106] The computer readable storage medium described above can be a transitory computer readable storage medium, or a non-transitory computer readable storage medium.

[0107] The technical solution of the embodiment of the present disclosure can be embodied in the form of a software product. The computer software product is stored in a storage medium, and includes one or more instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in the embodiment of the present disclosure. The aforementioned storage medium can be a non-transitory storage medium, including: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, etc. various media that can store program codes, or a transitory storage medium.

[0108] The foregoing description and accompanying drawings fully illustrate embodiments of this disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, procedural, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terminology used in this application is for describing embodiments only and is not intended to limit the claims. As used in the description of embodiments and claims, the singular forms “a,” “an,” and “the” are intended to equally include the plural forms unless the context clearly indicates otherwise. Similarly, the term “and / or” as used in this application means including one or more of the associated listed items and all possible combinations thereof. Additionally, when used in this application, the term "comprise" and its variations "comprises" and / or "comprising" refer to the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. Without further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element. In this document, each embodiment may focus on the differences from other embodiments, and similar or identical parts between embodiments can be referred to mutually. For methods, products, etc., disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, the relevant parts can be referred to the description of the method section.

[0109] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of this disclosure. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0110] In the embodiments disclosed herein, the disclosed methods, products (including but not limited to apparatuses, devices, etc.), can be implemented in other manners. For example, the described apparatus embodiments can be implemented only in a form of a logical function, and can be implemented by using a manner such as software (for example, application program) or the like. In some embodiments, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed coupling or direct coupling or indirect coupling between different units, or the coupling or direct coupling or indirect coupling between the displayed or discussed communication connections can be in a form of electrical, mechanical or other forms.

[0111] The flowcharts and block diagrams in the drawings show the possible implementation architectures, functions and operations of the system, method and computer program product according to the embodiments of the present disclosure. In this regard, each block in the flowcharts or block diagrams can represent a module, a program segment or a part of code containing one or more executable instructions for implementing the specified logical function. In some alternative implementations, the functions noted in the blocks can occur in an order different from that noted in the drawings. For example, two consecutive blocks can actually be executed substantially in parallel, and sometimes they can be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the drawings, the operations or steps corresponding to different blocks can also occur in an order different from that disclosed in the descriptions, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, and sometimes they can be executed in reverse order, depending on the functions involved. Each block in the block diagrams and / or flowcharts, and the combination of blocks in the block diagrams and / or flowcharts, can be implemented by a dedicated hardware-based system that performs the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. A control method for an air conditioner, characterized in that, include: Obtain motor speed and motor speed change trend; The fluctuation range of the carrier frequency is determined based on the motor speed and its variation trend. The frequency converter is controlled to randomly select values ​​within the fluctuation range and periodically adjust the carrier frequency; The step of determining the fluctuation range of the carrier frequency based on the motor speed and its variation trend includes: Determine the speed threshold based on the trend of motor speed change; The fluctuation range of the carrier frequency is determined based on the motor speed and the speed threshold.

2. The method according to claim 1, characterized in that, The step of determining the speed threshold based on the trend of motor speed change includes: If the motor speed change trend indicates an acceleration, then the speed threshold is determined as the first speed threshold; or... When the motor speed change trend indicates a decrease in speed, the speed threshold is determined as the second speed threshold. Among them, the first speed threshold is greater than the second speed threshold.

3. The method according to claim 2, characterized in that, When the trend of motor speed change indicates acceleration, determining the fluctuation range of the carrier frequency based on the motor speed and a speed threshold includes: When the motor speed is less than the first speed threshold, the fluctuation range of the carrier frequency is determined as the first fluctuation range; or, When the motor speed is greater than or equal to the first speed threshold, the fluctuation range of the carrier frequency is determined as the second fluctuation range.

4. The method according to claim 2, characterized in that, When the trend of motor speed change indicates a decrease in speed, determining the fluctuation range of the carrier frequency based on the motor speed and a speed threshold includes: If the motor speed is less than the second speed threshold, the fluctuation range of the carrier frequency is determined as the third fluctuation range; or, When the motor speed is greater than or equal to the second speed threshold, the fluctuation range of the carrier frequency is determined as the fourth fluctuation range.

5. The method according to any one of claims 1 to 4, characterized in that, After the frequency converter randomly selects values ​​within the fluctuation range and periodically adjusts the carrier frequency, the system further includes: Calculate the average value of the carrier frequency randomly selected within a preset time period to obtain the average carrier frequency; The strategy for adjusting the carrier frequency is based on the average carrier frequency and the reference carrier frequency corresponding to the fluctuation range.

6. The method according to claim 5, characterized in that, The strategy for adjusting the carrier frequency based on the average carrier frequency and the reference carrier frequency corresponding to the fluctuation range includes: If the average carrier frequency is less than the reference carrier frequency corresponding to the fluctuation range, maintain the current carrier frequency value; or, When the average carrier frequency is greater than or equal to the reference carrier frequency corresponding to the fluctuation range, a strategy is adopted to correct the current value of the carrier frequency.

7. The method according to claim 6, characterized in that, The strategy for correcting the current value of the carrier frequency includes: Based on the motor speed and its changing trend, determine the value correction scheme; The current carrier frequency value strategy is corrected according to the value correction scheme.

8. The method according to claim 7, characterized in that, The value correction scheme includes: The carrier frequency is controlled to randomly select values ​​within the new fluctuation range and periodically adjusted; or, The carrier frequency is controlled to operate at a fixed carrier frequency.

9. A control device for an air conditioner, comprising a processor and a memory storing program instructions, characterized in that, The processor is configured to execute the control method for an air conditioner as described in any one of claims 1 to 8 when running the program instructions.

10. An air conditioner, characterized in that, include: The air conditioner body is equipped with a motor and a frequency converter; The control device for an air conditioner as described in claim 9 is installed on the air conditioner body.

11. A storage medium storing program instructions, characterized in that, When the program instructions are executed, they perform the control method for an air conditioner as described in any one of claims 1 to 8.

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