Air conditioner defrosting method and device based on mass change of heat exchanger and air conditioner

Abstract

The invention provides an air conditioner defrosting method and device based on mass change of a heat exchanger and an air conditioner, and is applied to the field of air conditioner control. The method comprises the steps that under the condition that the air conditioner is in a running state, a first piezoelectric signal collected by a piezoelectric sensor is obtained, the first piezoelectric signal is filtered through a preset filtering algorithm, and a second piezoelectric signal is obtained; a second piezoelectric signal is obtained; the total mass of the outdoor unit heat exchanger at the current moment is calculated based on the second piezoelectric signal, and under the condition that the current mass is larger than a preset mass threshold value, the air conditioner is controlled to execute defrosting operation; wherein the preset filtering algorithm comprises the step of performing weighted average according to a plurality of adjacent signal values to obtain a filtered signal value. According to the air conditioner defrosting method and device based on the mass change of the heat exchanger and the air conditioner, defrosting of the air conditioner is controlled through the mass change of the outdoor unit heat exchanger, and precise and energy-saving intelligent defrosting control is achieved.

Description

Technical Field

[0001] This application relates to the field of air conditioner control, and in particular, to a defrosting method, device and air conditioner for an air conditioner based on the mass change of a heat exchanger. Background Art

[0002] With the continuous improvement of people's living standards and the continuous improvement of the intelligent level of household electrical appliances, intelligent household appliances are becoming more and more popular. Users can use an air conditioner for heating in winter to increase the indoor temperature; they can also use an air conditioner for cooling in summer to reduce the indoor temperature.

[0003] In the related art, a common defrosting determination method for an air conditioner is to monitor the temperature difference between the inlet and outlet of the outdoor heat exchanger or the difference from the ambient temperature. When the temperature difference is lower than a certain set threshold, it is determined that frosting is severe and defrosting is started.

[0004] However, the main basis of such a judgment method is an indirect manifestation of heat exchanger frosting, which may lead to insufficient defrosting or excessive defrosting, thereby increasing the energy consumption of the air conditioner unit and affecting the service life of the air conditioner unit. Summary of the Invention

[0005] The purpose of this application is to provide a defrosting method, device and air conditioner for an air conditioner based on the mass change of a heat exchanger, which is used to control the defrosting of the air conditioner through the mass change of the outdoor heat exchanger to achieve precise and energy-saving intelligent defrosting control.

[0006] This application provides a defrosting method for an air conditioner based on the mass change of a heat exchanger, which is applied to an air conditioner. A piezoelectric sensor is arranged on the chassis of the outdoor unit of the air conditioner, and the piezoelectric sensor is used to measure the mass of the heat exchanger. The method includes: When the air conditioner is in an operating state, obtain the first piezoelectric signal collected by the piezoelectric sensor, and use a preset filtering algorithm to filter the first piezoelectric signal to obtain a second piezoelectric signal; calculate the total mass of the outdoor heat exchanger at the current moment based on the second piezoelectric signal, and when the current mass is greater than a preset mass threshold, control the air conditioner to perform a defrosting operation; wherein, the preset filtering algorithm includes: obtaining a filtered signal value by performing weighted averaging on multiple adjacent signal values.

[0007] In this way, by controlling the defrosting of the air conditioner through the mass change of the outdoor heat exchanger, precise and energy-saving intelligent defrosting control can be achieved.

[0008] Optionally, the filtering the first piezoelectric signal by using a preset filtering algorithm to obtain a second piezoelectric signal includes: performing interval sampling on the first piezoelectric signal at a target sampling interval to obtain a plurality of original sampling points, and determining signal values of each of the original sampling points; dividing the signal values of a preset number of adjacent original sampling points into a sampling group to obtain a plurality of sampling groups, and sequentially calculating weighted average values of each of the sampling groups based on preset weight coefficients to obtain filtered signal values corresponding to each of the sampling groups; and performing fitting calculation on the filtered signal values corresponding to each of the sampling groups to obtain the second piezoelectric signal.

[0009] In this way, precise and energy-saving intelligent defrost control is achieved, effectively avoiding the decline in system efficiency caused by excessive frosting, while also reducing unnecessary defrosting times, and improving the overall operation efficiency and service life of the air-conditioning system.

[0010] Optionally, before performing interval sampling on the first piezoelectric signal at the target sampling interval to obtain a plurality of original sampling points, the method further includes: determining a vibration frequency of the outdoor unit heat exchanger based on the first piezoelectric signal, and determining the target sampling interval based on the vibration frequency; wherein the target sampling interval is negatively correlated with the vibration frequency.

[0011] Optionally, calculating a total mass of the outdoor unit heat exchanger at the current moment based on the second piezoelectric signal includes: obtaining peak values of each wave crest within a preset time period before the current time of the second piezoelectric signal to obtain a plurality of peak values; calculating an average peak value of the plurality of peak values, and determining the average peak value as the total mass of the outdoor unit heat exchanger at the current moment.

[0012] Optionally, after controlling the air conditioner to perform a defrosting operation, the method further includes: calculating a mass difference between a first mass and a second mass after the air conditioner performs the defrosting operation; the first mass is the mass of the refrigerant flowing into the outdoor unit heat exchanger; the second mass is the mass of the refrigerant flowing out of the outdoor unit heat exchanger; determining a frost accumulation mass of the outdoor unit heat exchanger as a difference between the total mass of the outdoor unit heat exchanger at the current moment, the mass of the heat exchanger, and the mass of the refrigerant; and controlling the air conditioner to stop performing the defrosting operation when the frost accumulation mass is less than a preset frost accumulation threshold.

[0013] In this way, the end of defrosting can be accurately controlled, avoiding a great impact on the user experience caused by long-term defrosting.

[0014] Optionally, after determining the frosting mass of the outdoor unit heat exchanger as the difference between the total mass of the outdoor unit heat exchanger at the current moment, the mass of the heat exchanger, and the mass of the refrigerant, the method further includes: when the frosting mass is greater than or equal to the preset frosting threshold, controlling the air conditioner to continue performing the defrosting operation.

[0015] Optionally, after calculating the total mass of the outdoor unit heat exchanger at the current moment based on the second piezoelectric signal, the method further includes: when the current mass is less than or equal to the preset mass threshold, keeping the current operating state of the air conditioner unchanged.

[0016] In this way, not only is the decrease in system efficiency caused by excessive defrosting effectively avoided, but also the overall operating efficiency and service life of the air conditioning system are improved.

[0017] The present application further provides an air conditioner defrosting device based on the change in the mass of the heat exchanger, which is applied to an air conditioner. A piezoelectric sensor is provided on the chassis of the outdoor unit of the air conditioner, and the piezoelectric sensor is used to measure the mass of the heat exchanger. The device includes: an acquisition module, configured to acquire a first piezoelectric signal collected by the piezoelectric sensor when the air conditioner is in an operating state; a filtering module, configured to filter the first piezoelectric signal using a preset filtering algorithm to obtain a second piezoelectric signal; a calculation module, configured to calculate the total mass of the outdoor unit heat exchanger at the current moment based on the second piezoelectric signal; a control module, configured to control the air conditioner to perform a defrosting operation when the current mass is greater than a preset mass threshold; wherein, the preset filtering algorithm includes: obtaining a filtered signal value by performing weighted averaging on multiple adjacent signal values.

[0018] Optionally, the filtering module is specifically configured to perform interval sampling on the first piezoelectric signal at a target sampling interval to obtain a plurality of original sampling points, and determine the signal value of each original sampling point; the filtering module is further specifically configured to divide the signal values of a preset number of adjacent original sampling points into a sampling group to obtain a plurality of sampling groups, and sequentially calculate the weighted average value of each sampling group based on a preset weight coefficient to obtain the filtered signal value corresponding to each sampling group; the filtering module is further specifically configured to perform fitting calculation on the filtered signal values corresponding to each sampling group to obtain the second piezoelectric signal.

[0019] Optionally, the calculation module is further configured to determine the vibration frequency of the outdoor unit heat exchanger based on the first piezoelectric signal, and determine the target sampling interval based on the vibration frequency; wherein, the target sampling interval is negatively correlated with the vibration frequency.

[0020] Optionally, the obtaining module is further configured to obtain the peak values of each peak within a preset time period before the current time of the second piezoelectric signal, so as to obtain a plurality of peak values; specifically, the calculating module is configured to calculate the peak average value of the plurality of peak values, and determine the peak average value as the total mass of the outdoor unit heat exchanger at the current moment.

[0021] Optionally, the calculating module is further configured to calculate the mass difference between the first mass and the second mass after the air conditioner performs the defrosting operation; the first mass is the mass of the refrigerant flowing into the outdoor unit heat exchanger; the second mass is the mass of the refrigerant flowing out of the outdoor unit heat exchanger; the calculating module is further configured to determine the difference between the total mass of the outdoor unit heat exchanger at the current moment, the mass of the heat exchanger, and the mass of the refrigerant as the frosting mass of the outdoor unit heat exchanger; the control module is further configured to control the air conditioner to stop performing the defrosting operation when the frosting mass is less than a preset frosting threshold.

[0022] Optionally, the control module is further configured to control the air conditioner to continue performing the defrosting operation when the frosting mass is greater than or equal to the preset frosting threshold.

[0023] Optionally, the control module is further configured to keep the current operating state of the air conditioner unchanged when the current mass is less than or equal to the preset mass threshold.

[0024] The present application further provides a computer program product, including a computer program / instructions, and when the computer program / instructions are executed by a processor, the steps of any one of the above-mentioned air conditioner defrosting methods based on the change of the heat exchanger mass are implemented.

[0025] The present application further provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, and when the processor executes the program, the steps of any one of the above-mentioned air conditioner defrosting methods based on the change of the heat exchanger mass are implemented.

[0026] The present application further provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of any one of the above-mentioned air conditioner defrosting methods based on the change of the heat exchanger mass are implemented.

[0027] The defrosting method, device and air conditioner for an air conditioner based on the mass change of a heat exchanger provided by the present application first, when the air conditioner is in an operating state, obtain a first piezoelectric signal collected by the piezoelectric sensor, and use a preset filtering algorithm to filter the first piezoelectric signal to obtain a second piezoelectric signal; then, calculate the total mass of the outdoor unit heat exchanger at the current moment based on the second piezoelectric signal, and when the current mass is greater than a preset mass threshold, control the air conditioner to perform a defrosting operation; wherein, the preset filtering algorithm includes: obtaining a filtered signal value by performing weighted averaging on a plurality of adjacent signal values. Thus, by controlling the defrosting of the air conditioner based on the mass change of the outdoor unit heat exchanger, intelligent defrosting control with precision and energy conservation can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0029] Figure 1 is a schematic diagram of the operating principle of the air conditioner provided by the present application; Figure 2 is one of the flow diagrams of the defrosting method for an air conditioner based on the mass change of a heat exchanger provided by the present application; Figure 3 is another flow diagram of the defrosting method for an air conditioner based on the mass change of a heat exchanger provided by the present application; Figure 4 is a schematic diagram of the structure of the defrosting device for an air conditioner based on the mass change of a heat exchanger provided by the present application; Figure 5 is a schematic diagram of the structure of the electronic device provided by the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] To make the objectives, technical solutions and advantages of the present application clearer, the following will clearly and completely describe the technical solutions in the present application with reference to the drawings in the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments in the present application belong to the scope of protection of the present application.

[0031] The terms "first", "second", etc. in the description and claims of this application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of this application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are usually of the same type, and the number of objects is not limited. For example, the first object can be one or multiple. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / ", generally represents an "or" relationship between the associated objects before and after.

[0032] The following will describe in detail the operating principle of the air conditioner involved in the embodiments of this application: As Figure 1 shown, the compressor compresses the refrigerant (refrigerant medium), and transports it to the condenser through a pipeline. The high-temperature and high-pressure gaseous refrigerant releases heat in the condenser and becomes a medium-temperature and high-pressure liquid refrigerant. After that, the medium-temperature and high-pressure liquid refrigerant becomes a low-temperature and low-pressure liquid refrigerant after the pressure is reduced by a capillary tube (throttling unit). The low-temperature and low-pressure liquid refrigerant is transported to the evaporator and evaporates from a liquid to a gas, and absorbs a large amount of heat during the evaporation process. Finally, the low-temperature and low-pressure gaseous refrigerant in the evaporator is transported to the compressor and participates in the next cycle. When the air conditioner is cooling, the heat exchanger of the outdoor unit is the condenser, and the heat exchanger of the indoor unit is the evaporator; conversely, when the air conditioner is heating, the heat exchanger of the outdoor unit is the evaporator, and the heat exchanger of the indoor unit is the condenser.

[0033] In view of the above technical problems existing in the defrost control of air conditioners in the related art, the embodiments of this application provide an air conditioner defrosting method based on the change in the mass of the heat exchanger. A piezoelectric sensor is installed on the chassis of the outdoor unit, and the piezoelectric sensor can accurately sense and measure the change in the weight of the heat exchanger placed on it. By monitoring the total weight of the heat exchanger in real time and combining the refrigerant flow state, the weight of the refrigerant flowing through the inside of the heat exchanger per unit time is calculated. After deducting this part of the dynamic refrigerant load from the total weight, the mass data reflecting the frost layer accumulated on the surface area of the heat exchanger is obtained. According to the calculated change in the mass of the frost layer, the control system of the present invention can accurately judge the degree of frosting of the heat exchanger, and then automatically trigger or adjust the defrosting strategy. This method overcomes the limitations of traditional defrosting determination based on temperature, time, and pressure thresholds, realizes precise and energy-saving intelligent defrost control, effectively avoids the decline in system efficiency caused by excessive frosting, and at the same time reduces unnecessary defrosting times, improving the overall operating efficiency and service life of the air conditioning system.

[0034] The following will, with reference to the accompanying drawings, illustrate in detail the air conditioner defrosting method based on the change in the mass of the heat exchanger provided by the embodiments of this application through specific embodiments and their application scenarios.

[0035] As Figure 2 shown, an air conditioner defrosting method based on the mass change of a heat exchanger provided by an embodiment of the present application may include the following steps 201 and 202: Step 201: When the air conditioner is in an operating state, obtain a first piezoelectric signal collected by the piezoelectric sensor, and use a preset filtering algorithm to filter the first piezoelectric signal to obtain a second piezoelectric signal.

[0036] Exemplarily, a piezoelectric sensor is provided on the chassis of the outdoor unit of the air conditioner in an embodiment of the present application. The piezoelectric sensor is installed between the chassis and the heat exchanger, and the heat exchanger is disposed on the piezoelectric sensor. The piezoelectric sensor can accurately sense and measure the weight change of the heat exchanger placed thereon.

[0037] Exemplarily, since the air conditioner generates vibrations during operation, there are many noise signals in the original signal (i.e., the above-mentioned first piezoelectric signal) collected by the piezoelectric sensor. In order to eliminate the influence of these noise signals, a filtering operation is required.

[0038] Specifically, the step of using a preset filtering algorithm to filter the first piezoelectric signal to obtain a second piezoelectric signal in the above step 201 may further include the following steps 201a1 to 201a3: Step 201a1: Sample the first piezoelectric signal at a target sampling interval to obtain a plurality of original sampling points, and determine the signal value of each original sampling point.

[0039] Step 201a2: Divide the signal values of a preset number of adjacent original sampling points into a sampling group to obtain a plurality of sampling groups, and sequentially calculate the weighted average value of each sampling group based on a preset weight coefficient to obtain the filtered signal value corresponding to each sampling group.

[0040] Step 201a3: Perform fitting calculation on the filtered signal values corresponding to each sampling group to obtain the second piezoelectric signal.

[0041] Exemplarily, as shown in (A) in Figure 3 and (B) in Figure 3 , first sample the first piezoelectric signal, and then take the signal values of every 3 adjacent sampling points (i.e., the above-mentioned preset number of original sampling points) as a group. Based on the weight coefficient corresponding to each sampling point ( Figure 3The weight coefficient shown is 1 / 3. During the actual calculation process, the weight coefficient can be adjusted according to requirements, and the sum of the weight coefficients corresponding to all sampling points is 1. Calculate the weighted average. Then, use this weighted average as the signal value after filtering for the above 3 adjacent sampling points. Calculate the signal value corresponding to each sampling group in turn according to the above method. Then, perform fitting calculation on the signal values after filtering corresponding to each sampling group to obtain the second piezoelectric signal after filtering.

[0042] Exemplarily, based on the second piezoelectric signal after filtering, the current mass of the outdoor unit heat exchanger can be accurately calculated, providing an accurate judgment basis for subsequent defrosting control.

[0043] In a possible implementation manner, the above target sampling interval can be calculated through the following step S1: Step S1: Determine the vibration frequency of the outdoor unit heat exchanger based on the first piezoelectric signal, and determine the target sampling interval based on the vibration frequency.

[0044] Among them, the target sampling interval is negatively correlated with the vibration frequency.

[0045] It can be understood that the higher the vibration frequency, the smaller the sampling interval, otherwise it will cause the sampling point spacing to be too large and unable to accurately reflect the influence caused by the vibration.

[0046] Step 202: Calculate the total mass of the outdoor unit heat exchanger at the current moment based on the second piezoelectric signal, and control the air conditioner to perform defrosting operation when the current mass is greater than the preset mass threshold.

[0047] Among them, the preset filtering algorithm includes: obtaining the filtered signal value after weighted averaging according to multiple adjacent signal values.

[0048] Exemplarily, the step of calculating the total mass of the outdoor unit heat exchanger at the current moment in the above step 202 may further include the following step 202a1 and step 202a2: Step 202a1: Obtain the peak values of each wave peak within a preset time period before the current time of the second piezoelectric signal to obtain multiple peak values.

[0049] Step 202a2: Calculate the peak average value of the multiple peak values and determine the peak average value as the total mass of the outdoor unit heat exchanger at the current moment.

[0050] Exemplarily, the second piezoelectric signal obtained after filtering the first piezoelectric signal is still a mass curve affected by vibration. In order to accurately calculate the mass of the outdoor unit heat exchanger, the peak values of each wave peak within a preset time period before the current time of the second piezoelectric signal can be obtained, and the average peak value obtained can be determined as the total mass of the outdoor unit heat exchanger at the current moment.

[0051] It can be understood that the total mass of the outdoor unit heat exchanger may include: the mass of the heat exchanger, the mass of the refrigerant in the heat exchanger, and the mass of the frost on the surface of the heat exchanger.

[0052] Exemplarily, after obtaining the total mass of the outdoor unit heat exchanger at the current moment, it can be compared with a preset mass threshold. When the total mass of the outdoor unit heat exchanger at the current moment is greater than the preset mass threshold, it can be determined that there is more frost on the surface of the outdoor unit heat exchanger at this time, and a defrosting operation is required.

[0053] In this way, intelligent defrosting control with precision and energy conservation is achieved, effectively avoiding the decline in system efficiency caused by excessive frosting, while also reducing unnecessary defrosting times, improving the overall operating efficiency and service life of the air conditioning system.

[0054] Optionally, in the embodiments of the present application, it is possible to determine whether to stop the defrosting operation by calculating the mass of the frost on the surface of the outdoor unit heat exchanger.

[0055] Exemplarily, after the above step 202, the air conditioner defrosting method based on the change in the mass of the heat exchanger provided in the embodiments of the present application may further include the following steps 203 to 205: Step 203, calculate the mass difference between the first mass and the second mass after the air conditioner performs the defrosting operation.

[0056] Wherein, the first mass is: the mass of the refrigerant flowing into the outdoor unit heat exchanger; the second mass is: the mass of the refrigerant flowing out of the outdoor unit heat exchanger.

[0057] Step 204, determine the mass of the frost on the outdoor unit heat exchanger by subtracting the mass of the heat exchanger and the mass of the refrigerant from the total mass of the outdoor unit heat exchanger at the current moment.

[0058] Step 205, control the air conditioner to stop performing the defrosting operation when the mass of the frost is less than the preset frost mass threshold.

[0059] Exemplarily, the mass of the frost on the surface of the outdoor unit heat exchanger can be calculated based on the mass difference of the refrigerant flowing in and out after the air conditioner performs the defrosting operation and the total mass of the outdoor unit heat exchanger, and the defrosting operation is stopped when the mass of the frost is less than the preset frost mass threshold.

[0060] In this way, not only is the decrease in system efficiency caused by excessive defrosting effectively avoided, but also the overall operating efficiency and service life of the air-conditioning system are improved.

[0061] Exemplarily, after the above step 204, the air conditioner defrosting method based on the mass change of the heat exchanger provided by the embodiment of the present application may further include the following step 206: Step 206, when the mass of the accumulated frost is greater than or equal to the preset frost accumulation threshold, control the air conditioner to continue to perform the defrosting operation.

[0062] Exemplarily, when the mass of the accumulated frost on the surface of the outdoor unit heat exchanger is greater than or equal to the preset frost accumulation threshold, it indicates that there is a large amount of accumulated frost on the surface of the outdoor unit heat exchanger. At this time, the defrosting operation still needs to be continued to remove the accumulated frost on the heat exchanger surface.

[0063] Optionally, in the embodiment of the present application, when judging whether defrosting is required according to the total mass of the outdoor unit heat exchanger, if the total mass of the heat exchanger does not meet the defrosting requirement, the current operating state is maintained unchanged.

[0064] Exemplarily, after calculating the total mass of the outdoor unit heat exchanger at the current moment based on the second piezoelectric signal in the above step 202, the air conditioner defrosting method based on the mass change of the heat exchanger provided by the embodiment of the present application may further include the following step 207: Step 207, when the current mass is less than or equal to the preset mass threshold, maintain the current operating state of the air conditioner unchanged.

[0065] Exemplarily, if the total mass of the heat exchanger does not meet the defrosting requirement, the current operating state is maintained unchanged, reducing unnecessary defrosting times and avoiding energy consumption losses caused by excessive defrosting.

[0066] It should be noted that the air conditioner in the embodiment of the present application may be a multi-connected air conditioner or other air conditioners.

[0067] The air conditioner defrosting method based on the mass change of the heat exchanger provided by the embodiment of the present application first, when the air conditioner is in an operating state, obtains the first piezoelectric signal collected by the piezoelectric sensor, and uses a preset filtering algorithm to filter the first piezoelectric signal to obtain a second piezoelectric signal; then, calculates the total mass of the outdoor unit heat exchanger at the current moment based on the second piezoelectric signal, and controls the air conditioner to perform a defrosting operation when the current mass is greater than the preset mass threshold; wherein, the preset filtering algorithm includes: obtaining the filtered signal value by performing weighted averaging on multiple adjacent signal values. In this way, by controlling the defrosting of the air conditioner through the mass change of the outdoor unit heat exchanger, precise and energy-saving intelligent defrosting control can be achieved.

[0068] It should be noted that for the defrosting method of the air conditioner based on the mass change of the heat exchanger provided in the embodiments of the present application, the execution subject can be the defrosting device of the air conditioner based on the mass change of the heat exchanger, or the control module in the defrosting device of the air conditioner based on the mass change of the heat exchanger for executing the defrosting method of the air conditioner based on the mass change of the heat exchanger. In the embodiments of the present application, taking the defrosting device of the air conditioner based on the mass change of the heat exchanger as an example to execute the defrosting method of the air conditioner based on the mass change of the heat exchanger, the defrosting device of the air conditioner based on the mass change of the heat exchanger provided in the embodiments of the present application is described.

[0069] It should be noted that in the embodiments of the present application, the defrosting method of the air conditioner based on the mass change of the heat exchanger shown in each of the above method drawings is exemplarily described by taking one drawing in the embodiments of the present application as an example. Specifically, when implemented, the defrosting method of the air conditioner based on the mass change of the heat exchanger shown in each of the above method drawings can also be implemented in combination with any other combinable drawings schemed in the above embodiments, which will not be elaborated here.

[0070] The defrosting device of the air conditioner based on the mass change of the heat exchanger provided by the present application is described below, and the following description can be correspondingly referred to the defrosting method of the air conditioner based on the mass change of the heat exchanger described above.

[0071] Figure 4 It is a schematic structural diagram of the defrosting device of the air conditioner based on the mass change of the heat exchanger provided by an embodiment of the present application, as Figure 4 shown, and specifically includes: An acquisition module 401, configured to acquire a first piezoelectric signal collected by the piezoelectric sensor when the air conditioner is in an operating state; a filtering module 402, configured to filter the first piezoelectric signal using a preset filtering algorithm to obtain a second piezoelectric signal; a calculation module 403, configured to calculate the total mass of the outdoor unit heat exchanger at the current moment based on the second piezoelectric signal; a control module 404, configured to control the air conditioner to perform a defrosting operation when the current mass is greater than a preset mass threshold; wherein, the preset filtering algorithm includes: obtaining a filtered signal value by performing weighted averaging on multiple adjacent signal values.

[0072] Optionally, the filtering module 402 is specifically configured to perform interval sampling on the first piezoelectric signal at a target sampling interval to obtain a plurality of original sampling points, and determine the signal value of each original sampling point; the filtering module 402 is further specifically configured to divide the signal values of a preset number of adjacent original sampling points into a sampling group to obtain a plurality of sampling groups, and calculate the weighted average value of each sampling group based on a preset weight coefficient in sequence to obtain the filtered signal value corresponding to each sampling group; the filtering module 402 is further specifically configured to perform fitting calculation on the filtered signal values corresponding to each sampling group to obtain the second piezoelectric signal.

[0073] Optionally, the calculation module 403 is further configured to determine the vibration frequency of the outdoor unit heat exchanger based on the first piezoelectric signal, and determine the target sampling interval based on the vibration frequency; wherein, the target sampling interval is negatively correlated with the vibration frequency.

[0074] Optionally, the acquisition module 401 is further configured to acquire the peak values of each wave crest within a preset time period before the current time of the second piezoelectric signal to obtain a plurality of peak values; the calculation module 403 is specifically configured to calculate the peak average value of the plurality of peak values, and determine the total mass of the outdoor unit heat exchanger at the current moment as the peak average value.

[0075] Optionally, the calculation module 403 is further configured to calculate the mass difference between the first mass and the second mass after the air conditioner performs a defrosting operation; the first mass is the mass of the refrigerant flowing into the outdoor unit heat exchanger; the second mass is the mass of the refrigerant flowing out of the outdoor unit heat exchanger; the calculation module 403 is further configured to determine the frost accumulation mass of the outdoor unit heat exchanger as the difference between the total mass of the outdoor unit heat exchanger at the current moment, the mass of the heat exchanger, and the mass of the refrigerant; the control module 404 is further configured to control the air conditioner to stop performing the defrosting operation when the frost accumulation mass is less than a preset frost accumulation threshold.

[0076] Optionally, the control module 404 is further configured to control the air conditioner to continue performing the defrosting operation when the frost accumulation mass is greater than or equal to the preset frost accumulation threshold.

[0077] Optionally, the control module 404 is further configured to keep the current operating state of the air conditioner unchanged when the current mass is less than or equal to the preset mass threshold.

[0078] The defrosting device for an air conditioner based on the mass change of a heat exchanger provided by this application first obtains the first piezoelectric signal collected by the piezoelectric sensor when the air conditioner is in an operating state, and filters the first piezoelectric signal using a preset filtering algorithm to obtain a second piezoelectric signal. Then, based on the second piezoelectric signal, the total mass of the outdoor unit heat exchanger at the current moment is calculated, and when the current mass is greater than a preset mass threshold, the air conditioner is controlled to perform a defrosting operation. Among them, the preset filtering algorithm includes: obtaining the filtered signal value through weighted averaging of multiple adjacent signal values. In this way, intelligent defrosting control that is precise and energy-saving can be achieved by controlling the defrosting of the air conditioner based on the mass change of the outdoor unit heat exchanger.

[0079] Figure 5 An example of a schematic physical structure diagram of an electronic device, and this electronic device can be the above-mentioned air conditioner, as Figure 5 shown, this electronic device may include: a processor 510, a communication interface 520, a memory 530, and a communication bus 540. Among them, the processor 510, the communication interface 520, and the memory 530 complete communication with each other through the communication bus 540. The processor 510 can call the logical instructions in the memory 530 to execute the method for defrosting an air conditioner based on the mass change of a heat exchanger, and this method includes: when the air conditioner is in an operating state, obtaining the first piezoelectric signal collected by the piezoelectric sensor, and using a preset filtering algorithm to filter the first piezoelectric signal to obtain a second piezoelectric signal; calculating the total mass of the outdoor unit heat exchanger at the current moment based on the second piezoelectric signal, and when the current mass is greater than a preset mass threshold, controlling the air conditioner to perform a defrosting operation. Among them, the preset filtering algorithm includes: obtaining the filtered signal value through weighted averaging of multiple adjacent signal values.

[0080] In addition, when the logical instructions in the above-mentioned memory 530 are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of this application. The aforementioned storage medium includes: various media such as USB flash drives, external hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs that can store program codes.

[0081] On the other hand, this application also provides a computer program product. The computer program product includes a computer program stored on a computer-readable storage medium. The computer program includes program instructions. When the program instructions are executed by a computer, the computer can execute the air conditioner defrosting method based on the mass change of the heat exchanger provided by the above-mentioned various methods. The method includes: when the air conditioner is in an operating state, obtaining a first piezoelectric signal collected by the piezoelectric sensor, and using a preset filtering algorithm to filter the first piezoelectric signal to obtain a second piezoelectric signal; calculating the total mass of the outdoor unit heat exchanger at the current moment based on the second piezoelectric signal, and controlling the air conditioner to perform a defrosting operation when the current mass is greater than a preset mass threshold; wherein, the preset filtering algorithm includes: obtaining a filtered signal value by performing weighted averaging on multiple adjacent signal values.

[0082] In yet another aspect, this application also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it is configured to execute the air conditioner defrosting method based on the mass change of the heat exchanger provided by the above-mentioned various methods. The method includes: when the air conditioner is in an operating state, obtaining a first piezoelectric signal collected by the piezoelectric sensor, and using a preset filtering algorithm to filter the first piezoelectric signal to obtain a second piezoelectric signal; calculating the total mass of the outdoor unit heat exchanger at the current moment based on the second piezoelectric signal, and controlling the air conditioner to perform a defrosting operation when the current mass is greater than a preset mass threshold; wherein, the preset filtering algorithm includes: obtaining a filtered signal value by performing weighted averaging on multiple adjacent signal values.

[0083] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. A person of ordinary skill in the art can understand and implement it without creative work.

[0084] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the essence of the above technical solution, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An air conditioner defrosting method based on the mass change of a heat exchanger, characterized in that, Applied to an air conditioner, a piezoelectric sensor is provided on the chassis of the outdoor unit of the air conditioner, and the piezoelectric sensor is used to measure the mass of the heat exchanger. The method includes: When the air conditioner is in an operating state, obtain the first piezoelectric signal collected by the piezoelectric sensor, and use a preset filtering algorithm to filter the first piezoelectric signal to obtain a second piezoelectric signal; Based on the second piezoelectric signal, calculate the total mass of the outdoor unit heat exchanger at the current moment, and when the current mass is greater than a preset mass threshold, control the air conditioner to perform a defrosting operation; Wherein, the preset filtering algorithm includes: obtaining a filtered signal value by performing weighted averaging on multiple adjacent signal values.

2. The method according to claim 1, characterized in that, The step of using a preset filtering algorithm to filter the first piezoelectric signal to obtain a second piezoelectric signal includes: Perform interval sampling on the first piezoelectric signal at a target sampling interval to obtain a plurality of original sampling points, and determine the signal value of each original sampling point; Divide the signal values of a preset number of adjacent original sampling points into a sampling group to obtain a plurality of sampling groups, and sequentially calculate the weighted average value of each sampling group based on a preset weight coefficient to obtain the filtered signal value corresponding to each sampling group; Perform fitting calculation on the filtered signal values corresponding to each sampling group to obtain the second piezoelectric signal.

3. The method according to claim 2, wherein Before performing interval sampling on the first piezoelectric signal at a target sampling interval to obtain a plurality of original sampling points, the method further includes: Determine the vibration frequency of the outdoor unit heat exchanger based on the first piezoelectric signal, and determine the target sampling interval based on the vibration frequency; Wherein, the target sampling interval is negatively correlated with the vibration frequency.

4. The method according to claim 1, wherein The step of calculating the total mass of the outdoor unit heat exchanger at the current moment based on the second piezoelectric signal includes: Obtain the peak values of each wave crest within a preset time period before the current time of the second piezoelectric signal to obtain a plurality of peak values; Calculate the peak average value of the plurality of peak values, and determine the peak average value as the total mass of the outdoor unit heat exchanger at the current moment.

5. The method according to claim 1, characterized in that After controlling the air conditioner to perform a defrosting operation, the method further includes: Calculate the mass difference between the first mass and the second mass after the air conditioner performs the defrosting operation; the first mass is: the mass of the refrigerant flowing into the outdoor unit heat exchanger; the second mass is: the mass of the refrigerant flowing out of the outdoor unit heat exchanger; Determine the frosting mass of the outdoor unit heat exchanger by subtracting the mass of the heat exchanger and the mass of the refrigerant from the total mass of the outdoor unit heat exchanger at the current moment; When the frosting mass is less than a preset frosting threshold, control the air conditioner to stop performing the defrosting operation.

6. The method according to claim 5, wherein After determining the frosting mass of the outdoor unit heat exchanger by subtracting the mass of the heat exchanger and the mass of the refrigerant from the total mass of the outdoor unit heat exchanger at the current moment, the method further includes: When the frosting mass is greater than or equal to the preset frosting threshold, control the air conditioner to continue performing the defrosting operation.

7. The method according to claim 1, characterized in that After calculating the total mass of the outdoor unit heat exchanger at the current moment based on the second piezoelectric signal, the method further includes: When the current mass is less than or equal to the preset mass threshold, keep the current operating state of the air conditioner unchanged.

8. An air conditioner defrosting device based on the mass change of a heat exchanger, characterized in that, Applied to an air conditioner, a piezoelectric sensor is provided on the chassis of the outdoor unit of the air conditioner, and the piezoelectric sensor is used to measure the mass of the heat exchanger. The device includes: An acquisition module, configured to acquire a first piezoelectric signal collected by the piezoelectric sensor when the air conditioner is in an operating state; A filtering module, configured to perform filtering processing on the first piezoelectric signal using a preset filtering algorithm to obtain a second piezoelectric signal; A calculation module, configured to calculate the total mass of the outdoor unit heat exchanger at the current moment based on the second piezoelectric signal; A control module, configured to control the air conditioner to perform a defrosting operation when the current mass is greater than the preset mass threshold; Wherein, the preset filtering algorithm includes: obtaining a filtered signal value by performing weighted averaging on multiple adjacent signal values.

9. An air conditioner, characterized in that, It includes a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, it implements the steps of the air conditioner defrosting method based on the change of the heat exchanger mass according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, A computer program is stored thereon. When the computer program is executed by a processor, it implements the steps of the air conditioner defrosting method based on the change of the heat exchanger mass according to any one of claims 1 to 7.

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