Control method of air conditioner, air conditioner and storage medium

Abstract

The invention discloses a control method of an air conditioner, the air conditioner and a storage medium. The method comprises the steps that indoor environment parameters of an indoor space adjusted by the air conditioner and the rotating speed of an indoor fan of the air conditioner are obtained; according to the indoor environment parameters and the rotating speed of the indoor draught fan, the maximum allowable operation frequency of a compressor of the air conditioner when the condensation risk does not exist in the air conditioner is determined; and the compressor is controlled to operate at the frequency smaller than or equal to the maximum frequency. The invention aims to reduce the condensation risk of the air conditioner and meet the comfortable requirement of indoor temperature and humidity.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a control method of an air conditioner, an air conditioner and a storage medium. Background Art

[0002] During the cooling process of the air conditioner, the indoor heat exchanger is in an evaporating state. When the indoor temperature and humidity are too high, it is easy to cause a large amount of condensation at the air outlet of the air conditioner, causing the air conditioner to blow water.

[0003] At present, the target frequency of the compressor is generally determined based on the range of indoor humidity. However, this method easily leads to a mismatch between the determined target frequency and the indoor temperature and humidity requirements, affecting the comfort of indoor users. Summary of the invention

[0004] The main purpose of the present invention is to provide a control method for an air conditioner, an air conditioner and a storage medium, aiming to reduce the condensation risk of the air conditioner while meeting the comfort requirements of indoor temperature and humidity.

[0005] To achieve the above object, the present invention provides a method for controlling an air conditioner, the method comprising the following steps:

[0006] Controlling the cooling operation of the air conditioner, and obtaining indoor environmental parameters of the indoor space regulated by the air conditioner and the indoor fan speed of the air conditioner;

[0007] Determine, based on the indoor environmental parameters and the indoor fan speed, the maximum frequency at which the compressor of the air conditioner is allowed to operate when there is no condensation risk in the air conditioner;

[0008] The compressor is controlled to operate at a frequency less than or equal to the maximum frequency.

[0009] Optionally, the indoor environmental parameters include indoor temperature and indoor humidity, and the step of determining the maximum frequency at which the compressor of the air conditioner is allowed to operate when there is no condensation risk in the air conditioner according to the indoor environmental parameters and the indoor fan speed includes:

[0010] determining a dew point temperature of the indoor space according to the indoor temperature and the indoor humidity;

[0011] Determine a predicted evaporation temperature corresponding to each preset frequency according to each preset frequency within a preset frequency range, the indoor temperature, and the indoor fan speed, wherein the predicted evaporation temperature is the temperature of the indoor heat exchanger of the air conditioner when it is predicted that there is no condensation risk in the air conditioner;

[0012] Determine the maximum value of all preset frequencies that meet the preset condition as the maximum frequency;

[0013] Wherein, the preset condition includes that the dew point temperature is less than the predicted evaporation temperature.

[0014] Optionally, the step of determining the predicted evaporation temperature corresponding to each preset frequency according to each preset frequency within the preset frequency range, the indoor temperature and the indoor fan speed includes:

[0015] Setting the first temperature as the candidate evaporation temperature and setting the second temperature as the candidate condensation temperature;

[0016] Determining the performance parameters of the compressor according to the preset frequency, the alternative evaporation temperature, and the alternative condensation temperature, the performance parameters including a first heat exchange amount output by the compressor and a refrigerant flow rate of the compressor;

[0017] Determine a second heat exchange amount of the indoor heat exchanger of the air conditioner according to the refrigerant flow rate, the indoor temperature, the indoor fan speed, the alternative evaporation temperature and the alternative condensation temperature;

[0018] When the deviation between the first heat exchange amount and the second heat exchange amount is less than or equal to a preset value, determining the candidate evaporation temperature as the predicted evaporation temperature;

[0019] When the deviation between the first heat exchange rate and the second heat exchange rate is greater than a preset value, the new evaporating temperature is set as the alternative evaporating temperature, the new condensing temperature is set as the alternative condensing temperature, and the process returns to the step of determining the first heat exchange rate output by the compressor and the refrigerant flow rate of the compressor according to the preset frequency, the alternative evaporating temperature and the alternative condensing temperature.

[0020] Optionally, the step of determining the performance parameter of the compressor according to the preset frequency, the alternative evaporation temperature and the alternative condensation temperature comprises:

[0021] Determining a target correspondence relationship between the alternative evaporation temperature, the alternative condensation temperature and the performance parameter according to the preset frequency;

[0022] Based on the target corresponding relationship, the performance parameters corresponding to the alternative evaporation temperature and the alternative condensation temperature are determined.

[0023] Optionally, the step of determining the second heat exchange amount of the indoor heat exchanger according to the refrigerant flow rate, the indoor temperature, the indoor fan speed, the alternative evaporation temperature and the alternative condensation temperature includes:

[0024] Determining a heat exchange temperature difference value of the indoor heat exchanger according to the indoor temperature, the alternative evaporation temperature, and the alternative condensation temperature;

[0025] Determining a total heat transfer coefficient of the indoor heat exchanger according to the refrigerant flow rate, the indoor temperature, the indoor fan speed, the alternative evaporation temperature, and the alternative condensation temperature;

[0026] The second heat exchange amount is determined according to the heat exchange temperature difference and the total heat transfer coefficient.

[0027] Optionally, the step of determining the heat exchange temperature difference of the indoor heat exchanger according to the indoor temperature, the alternative evaporation temperature and the alternative condensation temperature includes:

[0028] Determining the outlet temperature of the air after heat exchange by the indoor heat exchanger according to the alternative evaporation temperature and the indoor temperature;

[0029] Determine a first temperature difference between the indoor temperature and the air outlet temperature, determine a second temperature difference between the indoor temperature and the alternative evaporation temperature, and determine a third temperature difference between the air outlet temperature and the alternative evaporation temperature;

[0030] The heat exchange temperature difference value is determined according to the first temperature difference value, the second temperature difference value and the third temperature difference value.

[0031] Optionally, the step of determining the total heat transfer coefficient of the indoor heat exchanger according to the refrigerant flow rate, the indoor temperature, the indoor fan speed, the alternative evaporation temperature and the alternative condensation temperature includes:

[0032] determining a first convection heat transfer coefficient of an inner surface of the indoor heat exchanger according to the refrigerant flow rate, the alternative evaporation temperature, and the alternative condensation temperature;

[0033] Determining a second convection heat transfer coefficient of the outer surface of the indoor heat exchanger according to the indoor fan speed, the indoor temperature and the refrigerant flow rate;

[0034] The overall heat transfer coefficient is determined based on the first convection heat transfer coefficient and the second convection heat transfer coefficient.

[0035] Optionally, the step of determining a first convection heat transfer coefficient of an inner surface of the indoor heat exchanger according to the refrigerant flow rate, the alternative evaporation temperature, and the alternative condensation temperature includes:

[0036] determining the dryness of the refrigerant flowing into the indoor heat exchanger according to the alternative evaporation temperature and the alternative condensation temperature;

[0037] determining a liquid phase Prandtl number according to the alternative evaporation temperature;

[0038] The first convection heat transfer coefficient is determined according to the refrigerant flow rate, the dryness, the liquid phase Prandtl number and the size characteristic parameters of the indoor heat exchanger.

[0039] Optionally, the step of determining a second convection heat transfer coefficient of an outer surface of the indoor heat exchanger according to the indoor fan speed, the indoor temperature and the refrigerant flow rate includes:

[0040] Determine the Reynolds number of the refrigerant in the indoor heat exchanger according to the indoor fan speed and the indoor temperature;

[0041] The second convective heat transfer coefficient is determined according to the Reynolds number, the refrigerant flow rate, the fluid characteristic parameters of the refrigerant in the air conditioner, and the structural characteristic parameters of the indoor heat exchanger.

[0042] Optionally, the indoor environmental parameters include indoor temperature and indoor humidity, and the step of determining the maximum frequency at which the compressor of the air conditioner is allowed to operate when there is no condensation risk in the air conditioner according to the indoor environmental parameters and the indoor fan speed includes:

[0043] determining a correction factor according to the indoor temperature;

[0044] Based on the preset corresponding relationship, according to the maximum frequency corresponding to the correction coefficient, the indoor humidity and the indoor fan speed,

[0045] The preset corresponding relationship is the relationship between the preset correction coefficient, the indoor humidity, the indoor fan speed and the maximum frequency.

[0046] Optionally, the correction coefficient includes a first coefficient corresponding to the indoor humidity and a reference frequency, the first coefficient is negatively correlated with the indoor temperature, and the reference frequency is negatively correlated with the indoor temperature.

[0047] Optionally, the step of controlling the compressor to operate at a frequency less than or equal to the maximum frequency comprises:

[0048] When the current frequency of the compressor is less than or equal to the maximum frequency, controlling the compressor to maintain the current frequency operation;

[0049] When the current frequency of the compressor is greater than the maximum frequency, the compressor is controlled to operate at the maximum frequency.

[0050] In addition, in order to achieve the above-mentioned purpose, the present application also proposes an air conditioner, which includes: a memory, a processor, and an air conditioner control program stored in the memory and executable on the processor, and when the air conditioner control program is executed by the processor, the steps of the air conditioner control method as described in any one of the above items are implemented.

[0051] In addition, in order to achieve the above-mentioned purpose, the present application also proposes a storage medium, on which a control program of an air conditioner is stored. When the control program of the air conditioner is executed by a processor, the steps of the control method of the air conditioner as described in any of the above items are implemented.

[0052] The present invention proposes a control method for an air conditioner. During the cooling operation of the air conditioner, the method combines indoor environmental parameters and indoor fan speed to determine the maximum frequency allowed for the compressor to operate when the air conditioner does not condense, and controls the compressor to operate at a frequency less than or equal to the determined maximum frequency. The operating frequency of the compressor is no longer limited to a fixed target frequency, but can be adjusted within a frequency range not greater than the maximum frequency to adapt to actual indoor temperature and humidity requirements, thereby ensuring that the condensation risk of the air conditioner is reduced while meeting the comfortable temperature and humidity requirements of the indoor temperature and humidity. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 A schematic diagram of the hardware structure involved in the operation of an air conditioner according to an embodiment of the present invention;

[0054] Figure 2 A schematic diagram of a flow chart of an embodiment of a method for controlling an air conditioner according to the present invention;

[0055] Figure 3 A flow chart of another embodiment of a method for controlling an air conditioner according to the present invention;

[0056] Figure 4 The figure is a flow chart of another embodiment of the air conditioner control method of the present invention.

[0057] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0058] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0059] The embodiment of the present invention provides an air conditioner, which may include any type of air conditioner such as a wall-mounted air conditioner, a cabinet air conditioner, a window air conditioner, a mobile air conditioner, a ceiling air conditioner, a multi-split air conditioner, etc.

[0060] In the embodiment of the present invention, refer to Figure 1 The air conditioner includes a control device 100 and a heat pump system, and the heat pump system 200 includes a compressor, a first heat exchanger, a throttling device, and a second heat exchanger. The first heat exchanger, the throttling device, and the second heat exchanger are connected in sequence, the first heat exchanger is correspondingly provided with a first fan, the second heat exchanger is correspondingly provided with a second fan, and the heat pump system 200 is connected to the control device 100.

[0061] In this embodiment, the first heat exchanger is arranged indoors, the first fan is an indoor fan, the second heat exchanger is arranged outdoors, and the second fan is an outdoor fan.

[0062] In one implementation, the exhaust port of the compressor, the second heat exchanger, the throttling device, the first heat exchanger and the return air port of the compressor are connected in sequence, and the refrigerant discharged from the compressor flows through the second heat exchanger, the throttling device, the first heat exchanger in sequence and then flows back to the compressor. The first heat exchanger is in an evaporating state, and the second heat exchanger is in a condensing state.

[0063] In another implementation, the air conditioner further includes a reversing assembly, and the exhaust port of the compressor, the return air port of the compressor, the first heat exchanger, and the second heat exchanger are all connected to the reversing assembly. The reversing assembly has a first operating state and a second operating state. When the reversing assembly operates in the first operating state, the exhaust port of the compressor is connected to the first heat exchanger, the return air port of the compressor is connected to the second heat exchanger, and the refrigerant discharged from the compressor flows through the first heat exchanger, the throttling device, and the second heat exchanger in sequence before returning to the compressor; when the reversing assembly operates in the second operating state, the exhaust port of the compressor is connected to the second heat exchanger, the return air port of the compressor is connected to the first heat exchanger, and the refrigerant discharged from the compressor flows through the second heat exchanger, the throttling device, and the first heat exchanger in sequence before returning to the compressor.

[0064] Further, the air conditioner further includes an environment detection module 01, which is connected to the control device 100. The environment detection module 01 is arranged in the indoor space regulated by the air conditioner to detect indoor environmental parameters, which include indoor temperature and / or indoor humidity, etc. In this embodiment, the environment detection module 01 is arranged at the return air outlet of the air conditioner, and the indoor environmental parameters include indoor temperature and / or indoor humidity, etc.

[0065] In the embodiment of the present invention, refer to Figure 1 The control device 100 of the air conditioner includes: a processor 1001, such as a CPU, a memory 1002, and a timer 1003. Among them, these components are connected and communicated through a communication bus. The memory 1002 can be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. The memory 1002 can also be a storage device independent of the aforementioned processor 1001.

[0066] Those skilled in the art will understand that Figure 1 The device structure shown in the figure does not constitute a limitation of the device, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0067] like Figure 1As shown, the memory 1002 as a computer storage medium may include a control program for the air conditioner.

[0068] exist Figure 1 In the device shown, the processor 1001 can be used to call the air conditioner control program stored in the memory 1002 and execute the relevant steps of the air conditioner control method in the following embodiments.

[0069] The embodiment of the present invention further provides a control method of an air conditioner, which is applied to the above-mentioned air conditioner.

[0070] Reference Figure 2 , an embodiment of a control method of an air conditioner of the present application is proposed. In this embodiment, the control method of the air conditioner includes:

[0071] Step S10, controlling the air conditioner to operate in a cooling mode, and obtaining indoor environmental parameters of the indoor space regulated by the air conditioner and the indoor fan speed of the air conditioner;

[0072] During the cooling operation of the air conditioner, the indoor heat exchanger (ie, the first heat exchanger mentioned above) is in an evaporating state.

[0073] The indoor environmental parameters are specifically detected by the above-mentioned environmental detection module. The indoor fan speed is specifically the current operating speed of the above-mentioned first fan.

[0074] Step S20, determining the maximum frequency at which the compressor of the air conditioner is allowed to operate when there is no condensation risk in the air conditioner according to the indoor environmental parameters and the indoor fan speed;

[0075] Here, the air conditioner having no condensation risk refers to a state where the air outlet components of the air conditioner do not condense or the amount of condensation is less than a preset value.

[0076] Different indoor environmental parameters and different indoor fan speeds correspond to different maximum frequencies.

[0077] In one implementation, the correspondence between indoor environmental parameters, indoor fan speed and the maximum frequency here can be pre-set. The correspondence may include quantitative relationships, mapping relationships, machine learning models, etc. Based on the correspondence, the maximum frequency corresponding to the indoor environmental temperature and the indoor fan speed can be determined.

[0078] In another implementation method, the characteristic value of condensation risk corresponding to each preset frequency within the preset frequency range can be determined according to the indoor environmental parameters and the indoor fan speed, and the maximum value of all preset frequencies corresponding to the characteristic values ​​that meet the corresponding conditions that the air conditioner has no condensation risk can be taken as the maximum frequency.

[0079] In another implementation, the first correspondence between the indoor fan speed and the maximum frequency can be obtained according to the indoor environmental parameters. Different indoor environmental parameters correspond to different first correspondences. The maximum frequency corresponding to the indoor fan speed can be determined based on the determined first correspondence.

[0080] In another implementation, a second correspondence between the indoor environmental parameters and the maximum frequency can be obtained based on the indoor fan speed. Different indoor fan speeds correspond to different second correspondences. The maximum frequency corresponding to the indoor environmental parameters can be determined based on the determined second correspondence.

[0081] Step S30, controlling the compressor to operate at a frequency less than or equal to the maximum frequency.

[0082] When the compressor operates at a frequency not exceeding the maximum frequency, it can be considered that there is no risk of condensation in the air conditioner.

[0083] In this embodiment, when the current frequency of the compressor is less than or equal to the maximum frequency, the compressor is controlled to maintain the current frequency; when the current frequency of the compressor is greater than the maximum frequency, the compressor is controlled to operate at the maximum frequency. In this embodiment, the current frequency of the compressor operation can be determined according to indoor environmental parameters. Specifically, the relationship between indoor environmental parameters (such as indoor temperature or indoor humidity, etc.) and set environmental parameters of the air conditioner (such as set temperature or set humidity, etc.) can be determined, and the current frequency of the compressor operation is determined according to the relationship value.

[0084] A control method for an air conditioner is proposed in an embodiment of the present invention. During the cooling operation of the air conditioner, the method combines indoor environmental parameters and indoor fan speed to determine the maximum frequency allowed for the compressor to operate when the air conditioner is not condensing, and controls the compressor to operate at a frequency less than or equal to the determined maximum frequency. The operating frequency of the compressor is no longer limited to a fixed target frequency, but can be adjusted within a frequency range not greater than the maximum frequency to adapt to actual indoor temperature and humidity requirements, thereby ensuring that the condensation risk of the air conditioner is reduced while meeting the comfortable temperature and humidity requirements of the indoor temperature and humidity.

[0085] Further, based on the above embodiment, another embodiment of the control method of the air conditioner of the present application is proposed. In this embodiment, the indoor environmental parameters include indoor temperature and indoor humidity. Figure 3 , the step S20 comprises:

[0086] Step S21, determining the dew point temperature of the indoor space according to the indoor temperature and the indoor humidity;

[0087] Substitute the indoor temperature and indoor humidity into the dew point temperature calculation formula to calculate the dew point temperature. Alternatively, the temperature interval where the indoor temperature is located and the humidity interval where the indoor humidity is located can be determined, and the temperature mapped by the temperature interval and the humidity interval can be used as the dew point temperature.

[0088] Step S22, determining a predicted evaporation temperature corresponding to each preset frequency according to each preset frequency within a preset frequency range, the indoor temperature, and the indoor fan speed, wherein the predicted evaporation temperature is a temperature of the indoor heat exchanger of the air conditioner when it is predicted that there is no condensation risk in the air conditioner;

[0089] The preset frequency range is a collection of multiple preset frequencies. The preset frequency range may be a preset fixed frequency range, or the preset frequency range may be determined according to the outdoor ambient temperature.

[0090] In one implementation, a prediction algorithm model corresponding to frequency, temperature, rotation speed and predicted evaporation temperature is preset, each preset frequency and the indoor temperature are input into the prediction algorithm model, and the result output from the prediction algorithm model is used as the corresponding predicted evaporation temperature.

[0091] In another implementation, the correspondence between the frequency and the evaporation temperature of the air conditioner when there is no condensation can also be determined according to the indoor temperature and the indoor fan speed, and the predicted evaporation temperature corresponding to each preset frequency can be determined based on the correspondence.

[0092] Step S23, determining the maximum value of all the preset frequencies that meet the preset condition as the maximum frequency, wherein the preset condition includes that the dew point temperature is less than the predicted evaporation temperature.

[0093] The preset condition indicates that there is no condensation risk in the air conditioner. In this embodiment, the preset condition includes that the dew point temperature is less than the predicted evaporation temperature, and the difference between the predicted evaporation temperature and the dew point temperature is not greater than a preset value.

[0094] In this embodiment, the corresponding predicted evaporation temperature is determined in combination with the preset frequency, indoor temperature and indoor fan speed. Based on the predicted evaporation temperature, an accurate assessment is made as to whether there is a condensation risk when operating at each frequency within the preset frequency range, and the maximum frequency without condensation risk is selected as the upper limit frequency of the compressor operation, which is conducive to realizing the operation limit of the compressor frequency and ensuring that the compressor can effectively reduce the condensation risk when adapting to the changes in indoor temperature and humidity comfort requirements within a range less than or equal to the maximum frequency.

[0095] Further, in the present embodiment, step S22 includes: setting the first temperature as the alternative evaporating temperature, and setting the second temperature as the alternative condensing temperature; determining the performance parameters of the compressor according to the preset frequency, the alternative evaporating temperature, and the alternative condensing temperature, the performance parameters including the first heat exchange rate of the compressor and the refrigerant flow rate of the compressor; determining the second heat exchange rate of the indoor heat exchanger of the air conditioner according to the refrigerant flow rate, the indoor temperature, the indoor fan speed, the alternative evaporating temperature, and the alternative condensing temperature; when the deviation between the first heat exchange rate and the second heat exchange rate is less than or equal to a preset value, determining the alternative evaporating temperature as the predicted evaporating temperature; when the deviation between the first heat exchange rate and the second heat exchange rate is greater than a preset value, setting the new evaporating temperature as the alternative evaporating temperature, setting the new condensing temperature as the alternative condensing temperature, and returning to execute the step of determining the first heat exchange rate output by the compressor and the refrigerant flow rate of the compressor according to the preset frequency, the alternative evaporating temperature, and the alternative condensing temperature.

[0096] The first temperature and the second temperature are assumed values ​​corresponding to the evaporation temperature and the condensation temperature of the air conditioner system, respectively. A plurality of preset evaporation temperatures and a plurality of preset condensation temperatures may be preset, one of the plurality of preset evaporation temperatures being the first temperature, and one of the plurality of preset condensation temperatures being the second temperature. On this basis, when setting a new evaporation temperature as an alternative evaporation temperature, a preset evaporation temperature that has not been used as an alternative evaporation temperature among the plurality of preset evaporation temperatures may be used as the new evaporation temperature here, and a preset condensation temperature that has not been used as an alternative condensation temperature among the plurality of preset condensation temperatures may be used as the new condensation temperature here. Alternatively, the first temperature may be determined according to the current temperature of the evaporator of the air conditioner, and the second temperature may be determined according to the current temperature of the condenser of the air conditioner. Alternatively, the first temperature may be corrected according to the first preset value to obtain a new evaporation temperature as an alternative evaporation temperature, and the second temperature may be corrected according to the second preset value to obtain a new condensation temperature as an alternative condensation temperature.

[0097] In one implementation, the preset frequency, the alternative evaporation temperature, and the alternative condensation temperature may be substituted into the first preset formula to calculate the performance parameter of the compressor. In another implementation, a machine learning model trained to predict the performance parameter of the compressor may be preset, the preset frequency, the alternative evaporation temperature, and the alternative condensation temperature may be input into the machine learning model, and the result output by the machine learning model may be used as the performance parameter of the compressor.

[0098] In one implementation, the refrigerant flow rate, indoor temperature, indoor fan speed, alternative evaporation temperature and alternative condensation temperature may be substituted into a second preset formula to calculate the second heat exchange required by the heat exchanger. In another implementation, a machine learning model trained to predict the heat exchange required by the second heat exchanger may be preset, the refrigerant flow rate, indoor temperature, indoor fan speed, alternative evaporation temperature and alternative condensation temperature may be input into the machine learning model, and the result output by the machine learning model may be used as the second heat exchange.

[0099] In this embodiment, the preset value is 0. When the first heat exchange rate is equal to the second heat exchange rate, the alternative evaporation temperature is determined to be the predicted evaporation temperature; when the first heat exchanger is not equal to the second heat exchange rate, a new alternative evaporation temperature and an alternative condensation temperature are reconfigured, and whether the new alternative evaporation temperature can be used as the predicted evaporation temperature is determined by calculating the new heat exchange rate.

[0100] In this embodiment, the deviation between the first heat exchange rate and the second heat exchange rate is small, indicating that the heat exchange rate required by the indoor heat exchanger matches the output capacity of the compressor. At this time, the alternative evaporating temperature is used as the predicted evaporating temperature; otherwise, the heat exchange rate is recalculated and compared based on the new alternative evaporating internal temperature and the new alternative condensing temperature, so as to ensure that the determined predicted evaporating temperature is the evaporating temperature when the heat exchange rate required by the indoor heat exchanger accurately matches the output capacity of the compressor, thereby ensuring that the refrigeration capacity of the maximum frequency of the compressor determined based on the predicted evaporating temperature can meet the indoor comfort requirements.

[0101] Furthermore, in the present embodiment, the step of determining the performance parameters of the compressor according to the preset frequency, the alternative evaporating temperature and the alternative condensing temperature includes: determining a target correspondence between the alternative evaporating temperature, the alternative condensing temperature and the performance parameters according to the preset frequency; and determining the performance parameters corresponding to the alternative evaporating temperature and the alternative condensing temperature based on the target correspondence.

[0102] Different preset frequencies correspond to different target correspondences.

[0103] In this embodiment, a preset mathematical model between the alternative evaporation temperature, the alternative condensation temperature and the performance parameter can be preset, in which the alternative evaporation temperature and the alternative condensation temperature are independent variables, and the performance parameter is a dependent variable. All model coefficients corresponding to the independent variables in the preset mathematical model are determined according to the preset frequency, and different preset frequencies correspond to different model coefficients. The preset mathematical model with known model coefficients is used as the target corresponding relationship here. For example, the preset mathematical model here is:

[0104] Z=p1+p2x+p3y+p4x 2 +p5 xy+p6 y2 +p7 x 3 +p8 x 2 y+p9 xy 2 +p 10 y 3 ;

[0105] Where x is the alternative evaporation temperature, y is the alternative condensation temperature, Z is the performance parameter, p1 to p 10 It can be determined according to the preset frequency. Different preset frequencies correspond to different p1 to p 10 .

[0106] In this embodiment, a plurality of reference frequencies and model coefficients in a preset mathematical model corresponding to each reference frequency are pre-set, wherein a frequency interval is formed between two reference frequencies with adjacent values. Based on this, the frequency interval in which the preset frequency is located can be determined, the corresponding first mathematical model can be determined based on the model coefficient corresponding to the reference frequency at the upper limit of the frequency interval, and the corresponding second mathematical model can be determined based on the model coefficient corresponding to the reference frequency at the lower limit of the frequency interval. The first performance parameter is calculated by substituting the alternative evaporation temperature and the alternative condensation temperature into the first mathematical model, and the second performance parameter is calculated by substituting the alternative evaporation temperature and the alternative condensation temperature into the second mathematical model. The performance parameter of the compressor corresponding to the preset frequency is calculated based on the relationship between the preset frequency and the reference frequency at the upper limit of the frequency interval and the reference frequency at the lower limit of the frequency interval, and the first performance parameter and the second performance parameter based on the interpolation method.

[0107] In this embodiment, determining the performance parameters of the compressor in the above manner is conducive to improving the accuracy of the performance parameters, thereby further improving the accuracy of predicting the evaporation temperature, so as to further reduce the risk of air conditioning condensation while improving indoor comfort.

[0108] In other embodiments, multiple pre-stored correspondences between alternative evaporation temperatures, the alternative condensation temperatures and the performance parameters may also be pre-set, and different mathematical models are associated with different frequency intervals. The frequency interval where the preset frequency is located is determined, and the pre-stored correspondence associated with the frequency interval is used as the target correspondence.

[0109] Further, in the present embodiment, the step of determining the second heat exchange amount of the indoor heat exchanger according to the refrigerant flow rate, the indoor temperature, the indoor fan speed, the alternative evaporating temperature and the alternative condensing temperature includes: determining the heat exchange temperature difference of the indoor heat exchanger according to the indoor temperature, the alternative evaporating temperature and the alternative condensing temperature; determining the total heat transfer coefficient of the indoor heat exchanger according to the refrigerant flow rate, the indoor temperature, the indoor fan speed, the alternative evaporating temperature and the alternative condensing temperature; determining the second heat exchange amount according to the heat exchange temperature difference and the total heat transfer coefficient.

[0110] In this embodiment, the step of determining the heat exchange temperature difference of the indoor heat exchanger according to the indoor temperature, the alternative evaporation temperature and the alternative condensation temperature includes: determining the outlet air temperature after heat exchange of the indoor heat exchanger according to the alternative evaporation temperature and the indoor temperature; determining a first temperature difference between the indoor temperature and the outlet air temperature, determining a second temperature difference between the indoor temperature and the alternative evaporation temperature, and determining a third temperature difference between the outlet air temperature and the alternative evaporation temperature; determining the heat exchange temperature difference according to the first temperature difference, the second temperature difference and the third temperature difference. Specifically, the logarithm of the second temperature difference is calculated to obtain a first logarithm, the logarithm of the third temperature difference is calculated to obtain a second logarithm, the numerical difference between the first logarithm and the second logarithm is determined, and the heat exchange temperature difference is determined according to the ratio of the first temperature difference to the numerical difference. For example, the heat exchange temperature difference △T can be calculated by the following formula: △T=|(T a,in -T a,out ) / (ln(T a,in -Te)-ln(T a,out -Te))|, where T a,in is the indoor temperature, T a,out is the air outlet temperature, and Te is the alternative evaporation temperature. In other embodiments, a relationship between the indoor temperature, the alternative evaporation temperature, the alternative condensation temperature and the heat exchange temperature difference can be directly established, and the heat exchange temperature difference corresponding to the indoor temperature, the alternative evaporation temperature and the alternative condensation temperature can be calculated based on the relationship.

[0111] In the process of determining the total heat transfer coefficient, a quantitative relationship between the refrigerant flow rate, the indoor temperature, the indoor fan speed, the alternative evaporation temperature, and the alternative condensation temperature and the total heat transfer coefficient can be pre-established, and the total heat transfer coefficient here can be calculated by current data based on the quantitative relationship. Alternatively, multiple corresponding relationships between the refrigerant flow rate, the indoor temperature, the indoor fan speed and the total heat transfer coefficient can be pre-established, and a target corresponding relationship among the multiple corresponding relationships can be determined according to the alternative evaporation temperature and the alternative condensation temperature, and the total heat transfer coefficient corresponding to the current refrigerant flow rate, indoor temperature, and indoor fan speed can be determined based on the target corresponding relationship.

[0112] After obtaining the heat exchange temperature difference and the total heat transfer coefficient, the product of the total heat transfer coefficient and the heat exchange temperature difference can be used as the second heat exchange amount. The product of the total heat transfer coefficient and the heat exchange temperature difference can also be used as the second heat exchange amount after coefficient correction.

[0113] In this embodiment, determining the second heat exchange amount in the above manner is beneficial to the accuracy of the second heat exchange amount, thereby effectively improving the accuracy of the predicted evaporation temperature determined based on the second heat exchange amount, so as to further ensure that the subsequent determined maximum frequency of the compressor can be accurately matched with the indoor comfort requirements.

[0114] Further, in this embodiment, the step of determining the total heat transfer coefficient of the indoor heat exchanger according to the refrigerant flow rate, the indoor temperature, the indoor fan speed, the alternative evaporation temperature and the alternative condensation temperature includes:

[0115] A first convective heat transfer coefficient of the inner surface of the indoor heat exchanger is determined according to the refrigerant flow rate, the alternative evaporation temperature and the alternative condensation temperature; a second convective heat transfer coefficient of the outer surface of the indoor heat exchanger is determined according to the indoor fan speed, the indoor temperature and the refrigerant flow rate; and the total heat transfer coefficient is determined according to the first convective heat transfer coefficient and the second convective heat transfer coefficient.

[0116] In this embodiment, the process of determining the first convective heat transfer coefficient is as follows: determine the dryness of the refrigerant flowing into the indoor heat exchanger according to the alternative evaporation temperature and the alternative condensation temperature; determine the liquid phase Prandtl number according to the alternative evaporation temperature; determine the first convective heat transfer coefficient according to the refrigerant flow rate, the dryness, the liquid phase Prandtl number and the size characteristic parameters of the indoor heat exchanger. A quantitative relationship between the refrigerant flow rate, the dryness, the liquid phase Prandtl number and the size characteristic parameters of the indoor heat exchanger and the first convective heat transfer coefficient is established in advance. In this embodiment, the quantitative relationship here is established based on a semi-empirical correlation (such as the semi-empirical correlation provided by Sahn). Substitute the refrigerant flow rate, the dryness, the liquid phase Prandtl number and the size characteristic parameters of the indoor heat exchanger into the quantitative relationship to calculate the first convective heat transfer coefficient.

[0117] In this embodiment, the process of determining the second convective heat transfer coefficient is as follows: determine the Reynolds number of the refrigerant in the indoor heat exchanger according to the indoor fan speed and the indoor temperature; determine the second convective heat transfer coefficient according to the Reynolds number, the refrigerant flow rate, the fluid characteristic parameters of the refrigerant in the air conditioner, and the structural characteristic parameters of the indoor heat exchanger. Among them, the fluid characteristic parameters are parameters that characterize the flow characteristics of the refrigerant, including but not limited to: the dynamic viscosity of the refrigerant, etc. The structural characteristic parameters are the dimensional characteristic parameters of the structure related to heat exchange, including but not limited to at least one of the following parameters: the outer diameter of the pipe in the indoor heat exchanger, the fin pitch of the indoor heat exchanger, the pipe spacing in the indoor heat exchanger, the fin spacing of the indoor heat exchanger, the number of rows of pipes in the indoor heat exchanger, etc. The quantitative relationship between the Reynolds number, the refrigerant flow rate, the fluid characteristic parameters, and the structural characteristic parameters and the second convective heat transfer coefficient is established in advance. In this embodiment, the quantitative relationship here is established based on a semi-empirical correlation (such as the semi-empirical correlation provided by Wang). The Reynolds number, the refrigerant flow rate, the fluid characteristic parameter and the structural characteristic parameter are substituted into the quantitative relationship to calculate the second convective heat transfer coefficient.

[0118] In this embodiment, a correspondence between the first convective heat transfer coefficient, the second convective heat transfer coefficient and the total heat transfer coefficient is established in advance based on the heat transfer characteristic parameters of the indoor heat exchanger. In this embodiment, the correspondence is a quantitative relationship, in which the first convective heat transfer coefficient and the second convective heat transfer coefficient are independent variables, the total heat transfer coefficient is the dependent variable, and the heat transfer characteristic parameters are the coefficients corresponding to the independent variables in the quantitative relationship. Based on this, by substituting the current first convective heat transfer coefficient and the second convective heat transfer coefficient into the quantitative relationship, the total convective heat transfer coefficient can be calculated. In other embodiments, the correspondence can also be a mapping table, and the result obtained by looking up the first convective heat transfer coefficient and the second convective heat transfer coefficient is used as the total heat transfer coefficient.

[0119] In this embodiment, the above method is helpful to improve the accuracy of the total heat transfer coefficient, thereby further improving the accuracy of the predicted evaporation temperature, so as to further ensure that the upper limit frequency of the compressor can reduce the risk of condensation while further improving indoor comfort.

[0120] Further, based on any of the above embodiments, another embodiment of the control method of the air conditioner of the present application is proposed. In this embodiment, the indoor environmental parameters include indoor temperature and indoor humidity. Figure 4 , the step S20 comprises:

[0121] Step S201, determining a correction coefficient according to the indoor temperature;

[0122] Different indoor temperatures correspond to different correction coefficients. The correction coefficients may include but are not limited to: a first coefficient corresponding to indoor humidity, a second coefficient corresponding to indoor fan speed, a third coefficient corresponding to the overall indoor humidity and indoor fan speed, and so on.

[0123] A corresponding relationship between the indoor temperature and the correction coefficient is established in advance. The corresponding relationship may include a calculation relationship, a mapping relationship, etc. Based on the corresponding relationship, the correction coefficient corresponding to the current indoor temperature may be determined.

[0124] In one implementation, the correction coefficient may be calculated by substituting the indoor temperature into a preset formula.

[0125] In another implementation, multiple indoor temperature intervals can be pre-set, and different indoor temperature intervals are associated with different pre-stored correction coefficients. Based on this, the indoor temperature interval in which the indoor temperature is located can be determined, and the pre-stored correction coefficient associated with the indoor temperature interval is used as the correction coefficient here.

[0126] In this embodiment, the correction coefficient includes a first coefficient corresponding to the indoor humidity and a reference frequency, the first coefficient is negatively correlated with the indoor temperature, and the reference frequency is negatively correlated with the indoor temperature.

[0127] Step S202: based on a preset corresponding relationship, the maximum frequency corresponding to the correction coefficient, the indoor humidity and the indoor fan speed.

[0128] The preset corresponding relationship may be a quantitative relationship or a mapping relationship, etc. When the preset corresponding relationship is a quantitative relationship, the maximum frequency here may be calculated based on the correction coefficient, the indoor humidity, and the indoor fan speed.

[0129] In this embodiment, the correction coefficient includes the above-mentioned first coefficient, second coefficient and reference frequency. Based on the preset corresponding relationship, the indoor humidity can be corrected according to the first coefficient to obtain the first frequency correction value, and the indoor fan speed can be corrected according to the second coefficient to obtain the second frequency correction value. The reference frequency can be corrected according to the first frequency correction value and the second frequency correction value to obtain the maximum frequency here.

[0130] In this embodiment, a preset mathematical model (i.e., a preset corresponding relationship) between indoor humidity, indoor fan speed, and the maximum frequency can be preset. In the preset mathematical model, indoor humidity and indoor fan speed are independent variables, and the maximum frequency is a dependent variable. The correction coefficient here includes all model coefficients corresponding to the independent variables in the preset mathematical model, and different model coefficients corresponding to different indoor temperatures. The preset mathematical model with known model coefficients is used as the target relationship, and the maximum frequency can be calculated through the indoor humidity and the indoor fan speed. For example, the preset mathematical model here is: f max =K a*RH1+K b *V fan +C; where f max is the maximum frequency, K a is the first coefficient, RH1 is the indoor humidity, K b is the second coefficient, V fan is the indoor fan speed, and C is the reference frequency.

[0131] In this embodiment, the above method is conducive to ensuring the accuracy of the maximum frequency while improving the efficiency of determining the maximum frequency, so as to further effectively reduce the risk of air conditioning condensation while ensuring indoor comfort. Among them, the first coefficient is negatively correlated with the indoor temperature, and the reference frequency is negatively correlated with the indoor temperature, which is conducive to further reducing the risk of air conditioning condensation while improving indoor temperature comfort.

[0132] In addition, an embodiment of the present invention further proposes a storage medium, on which a control program for an air conditioner is stored. When the control program for the air conditioner is executed by a processor, the relevant steps of any embodiment of the control method for the air conditioner are implemented.

[0133] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

[0134] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0135] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes a number of instructions for a terminal device (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in each embodiment of the present invention.

[0136] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for controlling an air conditioner, characterized in that: The control method of the air conditioner comprises the following steps: Controlling the cooling operation of the air conditioner, and obtaining indoor environmental parameters of the indoor space regulated by the air conditioner and the indoor fan speed of the air conditioner; Determine, based on the indoor environmental parameters and the indoor fan speed, the maximum frequency at which the compressor of the air conditioner is allowed to operate when there is no condensation risk in the air conditioner; The compressor is controlled to operate at a frequency less than or equal to the maximum frequency.

2. The air conditioner control method according to claim 1, characterized in that: The indoor environmental parameters include indoor temperature and indoor humidity, and the step of determining the maximum frequency allowed for the compressor of the air conditioner to operate when there is no condensation risk in the air conditioner according to the indoor environmental parameters and the indoor fan speed includes: determining a dew point temperature of the indoor space according to the indoor temperature and the indoor humidity; Determine a predicted evaporation temperature corresponding to each preset frequency according to each preset frequency within a preset frequency range, the indoor temperature, and the indoor fan speed, wherein the predicted evaporation temperature is the temperature of the indoor heat exchanger of the air conditioner when it is predicted that there is no condensation risk in the air conditioner; Determine the maximum value of all preset frequencies that meet the preset condition as the maximum frequency; Wherein, the preset condition includes that the dew point temperature is less than the predicted evaporation temperature.

3. The air conditioner control method according to claim 2, characterized in that: The step of determining the predicted evaporation temperature corresponding to each preset frequency according to each preset frequency within the preset frequency range, the indoor temperature and the indoor fan speed comprises: Setting the first temperature as the candidate evaporation temperature and setting the second temperature as the candidate condensation temperature; Determining the performance parameters of the compressor according to the preset frequency, the alternative evaporation temperature, and the alternative condensation temperature, the performance parameters including a first heat exchange amount output by the compressor and a refrigerant flow rate of the compressor; Determine a second heat exchange amount of the indoor heat exchanger of the air conditioner according to the refrigerant flow rate, the indoor temperature, the indoor fan speed, the alternative evaporation temperature and the alternative condensation temperature; When the deviation between the first heat exchange amount and the second heat exchange amount is less than or equal to a preset value, determining the candidate evaporation temperature as the predicted evaporation temperature; When the deviation between the first heat exchange rate and the second heat exchange rate is greater than a preset value, the new evaporating temperature is set as the alternative evaporating temperature, the new condensing temperature is set as the alternative condensing temperature, and the process returns to the step of determining the first heat exchange rate output by the compressor and the refrigerant flow rate of the compressor according to the preset frequency, the alternative evaporating temperature and the alternative condensing temperature.

4. The air conditioner control method according to claim 3, characterized in that: The step of determining the performance parameter of the compressor according to the preset frequency, the alternative evaporation temperature and the alternative condensation temperature comprises: Determining a target correspondence relationship between the alternative evaporation temperature, the alternative condensation temperature and the performance parameter according to the preset frequency; Based on the target corresponding relationship, the performance parameters corresponding to the alternative evaporation temperature and the alternative condensation temperature are determined.

5. The air conditioner control method according to claim 3, characterized in that: The step of determining the second heat exchange amount of the indoor heat exchanger according to the refrigerant flow rate, the indoor temperature, the indoor fan speed, the alternative evaporation temperature and the alternative condensation temperature comprises: Determining a heat exchange temperature difference value of the indoor heat exchanger according to the indoor temperature, the alternative evaporation temperature, and the alternative condensation temperature; Determining a total heat transfer coefficient of the indoor heat exchanger according to the refrigerant flow rate, the indoor temperature, the indoor fan speed, the alternative evaporation temperature, and the alternative condensation temperature; The second heat exchange amount is determined according to the heat exchange temperature difference and the total heat transfer coefficient.

6. The control method of the air conditioner according to claim 5, characterized in that: The step of determining the heat exchange temperature difference of the indoor heat exchanger according to the indoor temperature, the alternative evaporation temperature and the alternative condensation temperature comprises: Determining the outlet temperature of the air after heat exchange by the indoor heat exchanger according to the alternative evaporation temperature and the indoor temperature; Determine a first temperature difference between the indoor temperature and the air outlet temperature, determine a second temperature difference between the indoor temperature and the alternative evaporation temperature, and determine a third temperature difference between the air outlet temperature and the alternative evaporation temperature; The heat exchange temperature difference value is determined according to the first temperature difference value, the second temperature difference value and the third temperature difference value.

7. The air conditioner control method according to claim 5, characterized in that: The step of determining the total heat transfer coefficient of the indoor heat exchanger according to the refrigerant flow rate, the indoor temperature, the indoor fan speed, the alternative evaporation temperature and the alternative condensation temperature comprises: determining a first convection heat transfer coefficient of an inner surface of the indoor heat exchanger according to the refrigerant flow rate, the alternative evaporation temperature, and the alternative condensation temperature; Determining a second convection heat transfer coefficient of the outer surface of the indoor heat exchanger according to the indoor fan speed, the indoor temperature and the refrigerant flow rate; The overall heat transfer coefficient is determined based on the first convection heat transfer coefficient and the second convection heat transfer coefficient.

8. The air conditioner control method according to claim 7, characterized in that: The step of determining a first convection heat transfer coefficient of the inner surface of the indoor heat exchanger according to the refrigerant flow rate, the alternative evaporation temperature, and the alternative condensation temperature comprises: determining the dryness of the refrigerant flowing into the indoor heat exchanger according to the alternative evaporation temperature and the alternative condensation temperature; determining a liquid phase Prandtl number according to the alternative evaporation temperature; The first convection heat transfer coefficient is determined according to the refrigerant flow rate, the dryness, the liquid phase Prandtl number and the size characteristic parameters of the indoor heat exchanger.

9. The air conditioner control method according to claim 7, characterized in that: The step of determining the second convection heat transfer coefficient of the outer surface of the indoor heat exchanger according to the indoor fan speed, the indoor temperature and the refrigerant flow rate comprises: Determine the Reynolds number of the refrigerant in the indoor heat exchanger according to the indoor fan speed and the indoor temperature; The second convective heat transfer coefficient is determined according to the Reynolds number, the refrigerant flow rate, the fluid characteristic parameters of the refrigerant in the air conditioner, and the structural characteristic parameters of the indoor heat exchanger.

10. The air conditioner control method according to claim 1, characterized in that: The indoor environmental parameters include indoor temperature and indoor humidity, and the step of determining the maximum frequency allowed for the compressor of the air conditioner to operate when there is no condensation risk in the air conditioner according to the indoor environmental parameters and the indoor fan speed includes: determining a correction factor according to the indoor temperature; Based on the preset corresponding relationship, according to the maximum frequency corresponding to the correction coefficient, the indoor humidity and the indoor fan speed, The preset corresponding relationship is the relationship between the preset correction coefficient, the indoor humidity, the indoor fan speed and the maximum frequency.

11. The air conditioner control method according to claim 10, characterized in that: The correction coefficient includes a first coefficient corresponding to the indoor humidity and a reference frequency, the first coefficient is negatively correlated with the indoor temperature, and the reference frequency is negatively correlated with the indoor temperature.

12. The method for controlling an air conditioner according to any one of claims 1 to 11, characterized in that: The step of controlling the compressor to operate at a frequency less than or equal to the maximum frequency comprises: When the current frequency of the compressor is less than or equal to the maximum frequency, controlling the compressor to maintain the current frequency operation; When the current frequency of the compressor is greater than the maximum frequency, the compressor is controlled to operate at the maximum frequency.

13. An air conditioner, characterized in that: The air conditioner includes: a memory, a processor, and a control program of the air conditioner stored in the memory and executable on the processor. When the control program of the air conditioner is executed by the processor, the steps of the control method of the air conditioner as described in any one of claims 1 to 12 are implemented.

14. A storage medium, characterized in that: The storage medium stores a control program of the air conditioner, and when the control program of the air conditioner is executed by the processor, the steps of the control method of the air conditioner according to any one of claims 1 to 12 are implemented.

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