Air conditioner and control method, control device and storage medium thereof

Abstract

The present invention discloses an air conditioner and a control method, a control device and a storage medium thereof, wherein the method comprises: determining an operation mode of the air conditioner, determining a target minimum operation frequency of a compressor according to the operation mode of the air conditioner and the current outdoor ambient temperature, and adjusting the target minimum operation frequency of the compressor according to the exhaust temperature of the compressor and the target exhaust temperature corresponding to the current outdoor ambient temperature when the compressor is operated at a first preset frequency, wherein the first preset frequency is determined by the target minimum operation frequency of the compressor and is greater than or equal to the target minimum operation frequency. Thus, the method performs a detailed analysis of the target minimum operation frequency of the compressor according to the operation mode of the air conditioner and the outdoor ambient temperature, and adjusts the target minimum operation frequency in combination with parameters during the operation of the compressor, thereby improving the comfort of use of the air conditioner and the reliability of the compressor, and avoiding stalling or frequent shutdowns caused by too low a compressor frequency.

Description

Technical Field

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

[0002] During the operation of the air conditioner, the compressor will gradually reduce the operating frequency according to the changes in the room conditions, achieving the effect of both energy saving and comfortable use. However, when the air conditioner is in the high temperature zone of cooling operation, the low speed load of the compressor becomes higher. At this time, the compressor frequency is too low, which will cause the compressor to stall. When the compressor is in the high temperature zone of heating operation, it is easy to shut down when it reaches the temperature according to the set minimum operating frequency. Although it can ensure the comfort of users, frequent start and stop will reduce the service life of the compressor. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art to at least a certain extent. To this end, the first purpose of the present invention is to provide a control method for an air conditioner, which performs a detailed analysis on the target minimum operating frequency of the compressor according to the operating mode of the air conditioner and the outdoor ambient temperature, and adjusts the target minimum operating frequency in combination with the parameters during the operation of the compressor, thereby improving the comfort of the air conditioner and the reliability of the compressor, and avoiding stalling or frequent shutdown caused by too low compressor frequency.

[0004] A second object of the present invention is to provide a control device for an air conditioner.

[0005] A third object of the present invention is to provide a computer-readable storage medium.

[0006] A fourth object of the present invention is to provide an air conditioner.

[0007] To achieve the above-mentioned objectives, a first aspect of an embodiment of the present invention proposes a method for controlling an air conditioner, the method comprising: determining an operating mode of the air conditioner; determining a target minimum operating frequency of the compressor according to the operating mode of the air conditioner and a current outdoor ambient temperature; when the compressor operates at a first preset frequency, adjusting the target minimum operating frequency of the compressor according to the exhaust temperature of the compressor and a target exhaust temperature corresponding to the current outdoor ambient temperature, wherein the first preset frequency is determined by the target minimum operating frequency of the compressor and is greater than or equal to the target minimum operating frequency.

[0008] According to the control method of the air conditioner of the embodiment of the present invention, the target minimum operating frequency of the compressor is determined according to the operating mode of the air conditioner and the current outdoor ambient temperature. When the compressor is operating at a first preset frequency, the target minimum operating frequency of the compressor is adjusted according to the exhaust temperature of the compressor and the target exhaust temperature corresponding to the current outdoor ambient temperature, wherein the first preset frequency is determined by the target minimum operating frequency of the compressor and is greater than or equal to the target minimum operating frequency. Thus, the method performs a detailed analysis of the target minimum operating frequency of the compressor according to the operating mode of the air conditioner and the outdoor ambient temperature, and adjusts the target minimum operating frequency in combination with the parameters during the operation of the compressor, thereby improving the comfort of the air conditioner and the reliability of the compressor, and avoiding stalling or frequent shutdowns caused by too low compressor frequency.

[0009] In addition, the control method of the air conditioner according to the above embodiment of the present invention may also have the following additional technical features:

[0010] According to some embodiments of the present invention, the target minimum operating frequency of the compressor is adjusted according to the exhaust temperature of the compressor and the target exhaust temperature corresponding to the current outdoor ambient temperature, including: when the exhaust temperature of the compressor is lower than the target exhaust temperature corresponding to the current outdoor ambient temperature, determining an adjustment coefficient according to the current outdoor ambient temperature; and adjusting the target minimum operating frequency of the compressor according to the adjustment coefficient.

[0011] According to some embodiments of the present invention, determining the adjustment coefficient according to the current outdoor ambient temperature includes: determining the adjustment coefficient according to the temperature range in which the current outdoor ambient temperature is located; wherein the adjustment coefficient is negatively correlated with the upper limit value of the temperature range.

[0012] According to some embodiments of the present invention, the control method of the air conditioner further includes: determining a target exhaust temperature according to a temperature range of the current outdoor ambient temperature; wherein the target exhaust temperature is positively correlated with an upper limit value of the temperature range.

[0013] According to some embodiments of the present invention, the control method of the air conditioner further includes: when the number of adjustments of the target minimum operating frequency of the compressor is greater than a preset number, determining the target minimum operating frequency of the compressor according to the last determined target minimum operating frequency of the compressor.

[0014] According to some embodiments of the present invention, the control method of the above-mentioned air conditioner also includes: when the number of adjustments of the target minimum operating frequency of the compressor is less than or equal to a preset number, if the target minimum operating frequency of the compressor is greater than or equal to the maximum operating frequency of the compressor corresponding to the current outdoor ambient temperature, then the maximum operating frequency of the compressor corresponding to the current outdoor ambient temperature is used as the target minimum operating frequency of the compressor.

[0015] According to some embodiments of the present invention, the target minimum operating frequency of the compressor is determined based on the operating mode of the air conditioner and the current outdoor ambient temperature, including: determining the slope and intercept of the linear function based on the operating mode of the air conditioner and the temperature range of the current outdoor ambient temperature; determining the target minimum operating frequency of the compressor based on the linear function and the current outdoor ambient temperature.

[0016] According to some embodiments of the present invention, the control method of the air conditioner further includes: when it is determined that the target minimum operating frequency of the compressor is in a resonance region, adjusting the target minimum operating frequency of the compressor according to an upper limit frequency value of the resonance region.

[0017] To achieve the above-mentioned purpose, the second aspect of the present invention proposes a control device for an air conditioner, comprising: a first determination module, used to determine the operating mode of the air conditioner; a second determination module, used to determine the target minimum operating frequency of the compressor according to the operating mode of the air conditioner and the current outdoor ambient temperature; an adjustment module, used to adjust the target minimum operating frequency of the compressor according to the exhaust temperature of the compressor and the target exhaust temperature corresponding to the current outdoor ambient temperature when the compressor operates at a first preset frequency, wherein the first preset frequency is determined by the target minimum operating frequency of the compressor and is greater than or equal to the target minimum operating frequency.

[0018] According to the control device of the air conditioner of the embodiment of the present invention, the first determination module determines the operation mode of the air conditioner, the second determination module determines the target minimum operation frequency of the compressor according to the operation mode of the air conditioner and the current outdoor ambient temperature, and the adjustment module adjusts the target minimum operation frequency of the compressor according to the exhaust temperature of the compressor and the target exhaust temperature corresponding to the current outdoor ambient temperature when the compressor is operating at the first preset frequency. Thus, the device performs a detailed analysis of the target minimum operation frequency of the compressor according to the operation mode of the air conditioner and the outdoor ambient temperature, and adjusts the target minimum operation frequency in combination with the parameters during the operation of the compressor, thereby improving the comfort of the air conditioner and the reliability of the compressor, and avoiding stalling or frequent shutdown caused by too low frequency of the compressor.

[0019] To achieve the above-mentioned purpose, a third aspect of the present invention provides a computer-readable 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 above-mentioned control method for the air conditioner is implemented.

[0020] The computer-readable storage medium of the embodiment of the present invention can improve the comfort of use of the air conditioner and the reliability of the compressor by executing the above-mentioned air conditioner control method, and avoid stalling or frequent shutdown caused by too low frequency of the compressor.

[0021] To achieve the above-mentioned purpose, the fourth aspect of the present invention proposes an air conditioner, including a memory, a processor, and an air conditioner control program stored in the memory and executable on the processor. When the processor executes the air conditioner control program, the above-mentioned air conditioner control method is implemented.

[0022] According to the air conditioner of the embodiment of the present invention, by executing the above-mentioned air conditioner control method, the use comfort of the air conditioner and the reliability of the compressor can be improved, and the stall or frequent shutdown caused by the compressor frequency being too low can be avoided.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a flow chart of a method for controlling an air conditioner according to some embodiments of the present invention;

[0025] Figure 2 A schematic diagram showing the relationship between the frequency and temperature of the cooling mode operation of the air conditioner according to some embodiments of the present invention;

[0026] Figure 3 A schematic diagram showing the relationship between the frequency and temperature of the heating mode operation of the air conditioner according to some embodiments of the present invention;

[0027] Figure 4 is a flow chart of a method for controlling an air conditioner according to some embodiments of the present invention;

[0028] Figure 5 is a flow chart of a method for controlling an air conditioner according to some embodiments of the present invention;

[0029] Figure 6 is a block diagram of a control device for an air conditioner according to some embodiments of the present invention;

[0030] Figure 7 is a block diagram of an air conditioner according to some embodiments of the present invention. DETAILED DESCRIPTION

[0031] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0032] The following describes a method for controlling an air conditioner, a control device for an air conditioner, a computer-readable storage medium, and an air conditioner according to embodiments of the present invention with reference to the accompanying drawings.

[0033] Figure 1 is a flow chart of a method for controlling an air conditioner according to some embodiments of the present invention.

[0034] like Figure 1 As shown, the control method of the air conditioner according to the embodiment of the present invention may include the following steps:

[0035] S1, determining the operation mode of the air conditioner.

[0036] Exemplarily, the operating modes of the air conditioner include heating mode, cooling mode, heating energy-saving mode, cooling energy-saving mode, dehumidification mode, health mode, blowing mode, etc. The user can select the desired operating mode through the mechanical buttons or touch buttons on the wire controller, or select the desired operating mode through a terminal device (such as a mobile phone, tablet computer, etc.), or select the desired operating mode through voice control. For example, when heating is required, the heating mode or the heating energy-saving mode can be selected; for another example, when cooling is required, the cooling mode or the cooling energy-saving mode can be selected; for another example, when dehumidification is required, the dehumidification mode is selected. When the user needs to use the heating mode, a control instruction is sent through the wire controller or the terminal device, and the air conditioner enters the heating mode when receiving the heating mode instruction; when the user needs to use the cooling mode, a control instruction is sent through the wire controller or the terminal device, and the air conditioner enters the cooling mode when receiving the cooling mode instruction.

[0037] S2, determining a target minimum operating frequency of the compressor according to the operating mode of the air conditioner and the current outdoor ambient temperature.

[0038] Among them, during the operation of the air conditioner, the low-frequency operation limit of the compressor is related to the compressor and the air-conditioning system. For example, when the refrigeration operation reaches the high temperature zone, the low-speed load of the compressor becomes higher. At this time, the compressor frequency is too low and it is easy to stall; when the heating operation reaches the high temperature zone, the compressor is easy to shut down due to temperature. It is necessary to appropriately reduce the target minimum operating frequency of the compressor to avoid frequent temperature shutdowns of the compressor, thereby improving comfort. However, the operating limit of the compressor low frequency is also related to factors such as ambient temperature. The current control method does not consider the impact of ambient temperature on the operating limit of the compressor low frequency, which reduces the comfort of using air conditioners in some temperature zones. This application determines the target minimum operating frequency of the compressor corresponding to different outdoor ambient temperatures based on the operating characteristics of the air-conditioning system at different ambient temperatures and in combination with the operating mode of the air conditioner.

[0039] S3, when the compressor is running at a first preset frequency, the target minimum operating frequency of the compressor is adjusted according to the exhaust temperature of the compressor and the target exhaust temperature corresponding to the current outdoor ambient temperature, wherein the first preset frequency is determined by the target minimum operating frequency of the compressor and is greater than or equal to the target minimum operating frequency, and the first preset frequency can be the target minimum operating frequency plus a preset value, and the preset value can be 3.

[0040] Specifically, during the operation of the air conditioner, the current outdoor ambient temperature is detected by a temperature sensor, the temperature range is determined according to the current outdoor ambient temperature, and the target minimum operating frequency of the corresponding compressor is calculated in combination with the operation mode of the air conditioner. When the air conditioner runs to the first preset frequency, in order to improve stability, the exhaust temperature of the compressor can be detected by a temperature sensor arranged at the exhaust port of the compressor after the air conditioner runs at the first preset frequency and continues for a period of time. Then, it is judged whether the exhaust temperature of the compressor and the target exhaust temperature corresponding to the current outdoor ambient temperature meet the preset conditions. For example, the preset condition can be that the exhaust temperature of the compressor is less than the target exhaust temperature corresponding to the current outdoor ambient temperature. If the preset conditions are met, the target minimum operating frequency of the compressor is adjusted, for example, the target minimum operating frequency of the compressor is increased according to the preset ratio; if not, the target minimum operating frequency of the compressor is maintained. Different outdoor ambient temperatures have different corresponding target exhaust temperatures. The higher the temperature, the higher the corresponding target exhaust temperature. The lower the temperature, the lower the corresponding target exhaust temperature. Different outdoor ambient temperatures have different preset ratios.

[0041] It needs to be explained that when the compressor is running at the first preset frequency, the exhaust temperature of the compressor begins to be detected. The advance detection method is mainly due to the lag in the air conditioner response, which improves the timeliness of the compressor control and avoids the compressor running at a low frequency for a long time, resulting in low exhaust temperature and lubricating oil temperature and poor lubrication effect.

[0042] Therefore, the target minimum operating frequency of the compressor is analyzed in detail according to the operating mode of the air conditioner and the outdoor ambient temperature, and the target minimum operating frequency is adjusted in combination with the parameters during the operation of the compressor, thereby improving the comfort of the air conditioner and the reliability of the compressor, and avoiding stalling or frequent shutdowns caused by too low compressor frequency.

[0043] The control method of the air conditioner according to the embodiment of the present invention is described in detail below.

[0044] In some embodiments of the present invention, the target minimum operating frequency of the compressor is determined based on the operating mode of the air conditioner and the current outdoor ambient temperature, including: determining the slope and intercept of the linear function based on the operating mode of the air conditioner and the temperature range of the current outdoor ambient temperature; determining the target minimum operating frequency of the compressor based on the linear function and the current outdoor ambient temperature.

[0045] Specifically, it is divided into multiple temperature intervals, each interval corresponds to a different target minimum operating frequency, and the calculation method of the target minimum operating frequency can be represented by a linear function (linear function). The horizontal axis represents the current outdoor ambient temperature, and the slope and intercept are different in each temperature interval.

[0046] Taking the cooling mode as an example, as shown in Table 1, the target minimum operating frequency of the compressor is represented by F(T4), the outdoor ambient temperature is represented by T4, the slope of the linear function is represented by a, the intercept of the linear function is represented by b, and the formula of the target minimum operating frequency of the compressor is F(T4) = a*T4+b. When the outdoor ambient temperature T4 is 15°C, it is in the interval T4≤16°C. At this time, the slope a is 0, the intercept b is 25, and the calculated target minimum operating frequency F(T4) of the compressor is 25Hz; when the outdoor ambient temperature T4 is 18°C, it is in the interval 16°C<T4≤20°C. At this time, the slope a is -3.75, the intercept b is 85, and the calculated target minimum operating frequency F(T4) of the compressor is 17.5Hz; when the outdoor ambient temperature T4 is 30°C, it is in the interval 20°C<T4≤40°C. At this time, the slope a is -3.75, the intercept b is 85, and the calculated target minimum operating frequency F(T4) of the compressor is 17.5Hz. is 0, intercept b is 10, and the calculated target minimum operating frequency F(T4) of the compressor is 10Hz; when the outdoor ambient temperature T4 is 42℃, it is in the interval 40℃<T4≤45℃, at this time the slope a is 3.8, intercept b is -142, and the calculated target minimum operating frequency F(T4) of the compressor is 17.6Hz; when the outdoor ambient temperature T4 is 50℃, it is in the interval 45℃<T4, at this time the slope a is 0, intercept b is 29, and the calculated target minimum operating frequency F(T4) of the compressor is 29Hz. That is to say, in the cooling mode, if Figure 2 As shown, the target minimum operating frequency of the compressor decreases first, then tends to be stable, then increases, and finally tends to be stable again. This is because at low temperatures, the reliability of the compressor operation needs to be considered; at intermediate temperatures, it is the temperature zone with the widest use of air conditioner refrigeration. In this temperature zone, the target minimum operating frequency of the compressor is used more frequently, which does less harm to the reliability of the compressor and the air conditioner pressure is relatively small; at high temperatures, the drive control of the compressor needs to consider the air conditioner pressure. If the air conditioner pressure is high, the target minimum operating frequency of the compressor is too low, resulting in overload, which can easily cause stall problems.

[0047] Taking the air conditioner operating mode as heating mode as an example, the target minimum operating frequency of the compressor is represented by F(T4), the outdoor ambient temperature is represented by T4, the slope of the linear function is represented by c, the intercept of the linear function is represented by d, and the formula for the target minimum operating frequency of the compressor is F(T4)=c*T4+d. When the outdoor ambient temperature T4 is -10℃, it is in the interval T4≤-5℃. At this time, the slope c is 0, the intercept d is 34, and the calculated target minimum operating frequency F(T4) of the compressor is 34Hz; when the outdoor ambient temperature T4 is -3℃, it is in the interval -5℃<T4≤0℃. At this time, the slope c is -1.6, the intercept d is 26, and the calculated target minimum operating frequency F(T4) of the compressor is 30.8Hz; when the outdoor ambient temperature T4 is 3℃, it is in the interval 0℃<T4≤5℃. At this time, the slope c is 0, the intercept d is 26, and the calculated target minimum operating frequency F(T4) of the compressor is 26Hz; when the outdoor ambient temperature T4 is 6℃, it is in the interval 5℃<T4≤10℃. At this time, the slope c is -1 .2, the intercept d is 32, and the calculated target minimum operating frequency F(T4) of the compressor is 24.8Hz; when the outdoor ambient temperature T4 is 13℃, it is in the interval 10℃<T4≤15℃, at this time the slope c is 0, the intercept d is 20, and the calculated target minimum operating frequency F(T4) of the compressor is 20Hz; when the outdoor ambient temperature T4 is 20℃, it is in the interval 15℃<T4≤25℃, at this time the slope c is -0.8, the intercept d is 32, and the calculated target minimum operating frequency F(T4) of the compressor is 16Hz; when the outdoor ambient temperature T4 is 30℃, it is in the interval 25℃<T4, the slope c is 0, the intercept d is 12, and the calculated target minimum operating frequency F(T4) of the compressor is 12Hz. That is to say, in the heating mode, if Figure 3 As shown, as the current outdoor ambient temperature increases, the target minimum operating frequency of the compressor gradually decreases.

[0048] Table 1

[0049]

[0050] Table 2

[0051]

[0052] It should be noted that the upper and lower limits of the current outdoor ambient temperature range given in Table 1 and Table 2 are used as a specific example, and can also be more accurately determined to the slope and intercept of the linear function corresponding to each specific outdoor ambient temperature, which is not limited here and is not described in detail. In addition, the target minimum operating frequency under the current outdoor ambient temperature can also be determined directly based on the corresponding relationship between the outdoor ambient temperature and the target minimum operating frequency.

[0053] In some embodiments of the present invention, the target minimum operating frequency of the compressor is adjusted according to the exhaust temperature of the compressor and the target exhaust temperature corresponding to the current outdoor ambient temperature, including: when the exhaust temperature of the compressor is lower than the target exhaust temperature corresponding to the current outdoor ambient temperature, determining an adjustment coefficient according to the current outdoor ambient temperature; and adjusting the target minimum operating frequency of the compressor according to the adjustment coefficient.

[0054] Furthermore, in some embodiments of the present invention, determining the adjustment coefficient according to the current outdoor ambient temperature includes: determining the adjustment coefficient according to the temperature range in which the current outdoor ambient temperature is located; wherein the adjustment coefficient is negatively correlated with the upper limit value of the temperature range.

[0055] In some embodiments of the present invention, the control method of the air conditioner further includes: determining a target exhaust temperature according to a temperature range of the current outdoor ambient temperature; wherein the target exhaust temperature is positively correlated with an upper limit value of the temperature range.

[0056] Specifically, after determining the target minimum operating frequency corresponding to the current outdoor ambient temperature through the above embodiment, during the operation of the air conditioner, if the operating frequency of the compressor is close to the target minimum operating frequency, the exhaust temperature of the compressor is obtained by the temperature sensor arranged at the exhaust port of the compressor, and the corresponding target exhaust temperature is determined according to the current outdoor ambient temperature, and then, according to the size relationship between the exhaust temperature of the compressor and the target exhaust temperature corresponding to the current outdoor ambient temperature, it is determined whether the target minimum operating frequency of the compressor needs to be adjusted. Wherein, when the exhaust temperature of the compressor is less than the target exhaust temperature corresponding to the current outdoor ambient temperature, the adjustment coefficient is determined according to the current outdoor ambient temperature, and the larger the outdoor ambient temperature, the larger the corresponding adjustment coefficient, and the smaller the outdoor ambient temperature, the smaller the corresponding adjustment coefficient. For example, the adjustment formula in the cooling mode can be F(T4)=m*[a*T4+b], wherein the target minimum operating frequency can be expressed as F(T4), the adjustment coefficient can be expressed as m, and the current outdoor ambient temperature can be expressed as T4; the adjustment formula in the heating mode can be F(T4)=n*[c*T4+d], and the target minimum operating frequency of the compressor is adjusted. This can avoid the situation where the compressor cylinder temperature and lubricating oil temperature are low, which causes the lubricating oil to easily precipitate and is difficult to form an oil film, which will affect the service life of the compressor. Therefore, when the exhaust temperature of the compressor does not reach the target exhaust temperature corresponding to the current outdoor ambient temperature, the target minimum operating frequency of the compressor is increased. While ensuring the user's comfort, the operating reliability of the compressor can also be improved.

[0057] Exemplarily, taking the cooling operation mode of the air conditioner as an example, when the current outdoor ambient temperature is in the interval of T4≤20℃, the corresponding target exhaust temperature is determined to be Tpaim1, and when the exhaust temperature of the compressor is Tp<Tpaim1, it is determined that the target minimum operating frequency of the compressor needs to be adjusted, and the corresponding adjustment coefficient m can be m1 (m1 can be 1.2). When the current outdoor ambient temperature is in the interval of 20℃<T4≤29℃, the corresponding target exhaust temperature is determined to be Tpaim2, and when the exhaust temperature of the compressor is Tp<Tpaim2, it is determined that the target minimum operating frequency of the compressor needs to be adjusted, and the corresponding adjustment coefficient m can be m2 (m1 can be 1.15). When the current outdoor ambient temperature is in the interval of 29℃<T4≤40℃, the corresponding target exhaust temperature is determined to be Tpaim3. When the exhaust temperature of the compressor Tp<Tpaim3, it is determined that the target minimum operating frequency of the compressor needs to be adjusted. At this time, the corresponding adjustment coefficient m can be m3 (m1 can be 1.1), wherein Tpaim1<Tpaim2<Tpaim3, m1>m2>m3.

[0058] For example, taking the operation mode of the air conditioner as the heating operation mode, when the current outdoor ambient temperature is in the interval of T4≤-15℃, the corresponding target exhaust temperature is determined to be Tpaim4, and when the exhaust temperature of the compressor is Tp<Tpaim4, it is determined that the target minimum operating frequency of the compressor needs to be adjusted, and the corresponding adjustment coefficient n can be n1 (n1 can be 1.3). When the current outdoor ambient temperature is in the interval of -15℃<T4≤-5℃, the corresponding target exhaust temperature is determined to be Tpaim5, and when the exhaust temperature of the compressor is Tp<Tpaim5, it is determined that the target minimum operating frequency of the compressor needs to be adjusted, and the corresponding adjustment coefficient n can be n2 (n1 can be 1.2). When the current outdoor ambient temperature is in the interval of -5℃<T4≤10℃, the corresponding target exhaust temperature is determined to be Tpaim6. When the exhaust temperature of the compressor Tp<Tpaim6, it is determined that the target minimum operating frequency of the compressor needs to be adjusted. At this time, the corresponding adjustment coefficient n can be n3 (n1 can be 1.15), where Tpaim4<Tpaim5<Tpaim6, n1>n2>n3.

[0059] In some embodiments of the present invention, the control method of the air conditioner further includes: when the adjustment number of the target minimum operating frequency of the compressor is greater than the preset number, determining the target minimum operating frequency of the compressor according to the target minimum operating frequency of the compressor determined last time. The preset number can be calibrated according to actual conditions, for example, the preset number can be 2.

[0060] Specifically, when the air conditioner is running in heating mode or cooling mode, if the exhaust temperature of the compressor is lower than the target exhaust temperature corresponding to the current outdoor ambient temperature, it is determined that the minimum operating frequency of the compressor needs to be adjusted. When the minimum operating frequency of the compressor is adjusted, the number of adjustments is recorded, and it is determined whether the minimum operating frequency of the compressor is still adjusted according to the number of adjustments. Among them, when the number of adjustments of the minimum operating frequency of the compressor is greater than the preset number, it means that the number of adjustments is large. At this time, the target minimum operating frequency of the compressor is calculated according to the calculation formula of the last target minimum operating frequency of the compressor. For example, the air conditioner is running in heating mode, and the temperature range of the current outdoor ambient temperature is -15℃<T4≤-5℃. The calculation formula of the last target minimum operating frequency of the compressor is F(T4)=1.2*[0*T4+34]. At this time, the adjustment number of the target minimum operating frequency of the compressor has exceeded the preset number, and the calculation formula of the target minimum operating frequency of the compressor this time is still F(T4)=1.2*[0*T4+34]. Therefore, it is possible to avoid frequent adjustments to the target minimum operating frequency of the compressor, which may cause problems such as frequent start and shutdown of the compressor and power consumption. It is also possible to avoid the problem of too few adjustments to the minimum operating frequency of the compressor, which may affect the service life of the compressor and user experience.

[0061] In some embodiments of the present invention, the control method of the above-mentioned air conditioner also includes: when the number of adjustments of the target minimum operating frequency of the compressor is less than or equal to the preset number, if the target minimum operating frequency of the compressor is greater than or equal to the maximum operating frequency of the compressor corresponding to the current outdoor ambient temperature, then the maximum operating frequency of the compressor corresponding to the current outdoor ambient temperature is used as the target minimum operating frequency of the compressor.

[0062] Specifically, when the number of adjustments to the target minimum operating frequency of the compressor is less than or equal to the preset number of times, it is determined whether the target minimum operating frequency of the compressor is less than the maximum operating frequency of the compressor corresponding to the current outdoor ambient temperature. When the target minimum operating frequency of the compressor is less than the maximum operating frequency of the compressor corresponding to the current outdoor ambient temperature, the current method of calculating the target minimum operating frequency of the compressor remains unchanged. For example, the operating mode of the air conditioner is the heating mode, and the temperature range of the current outdoor ambient temperature is -5℃<T4≤10℃, F(T4)=1.15*[-1.6*T4+26]. The current calculation formula remains unchanged, and the target minimum operating frequency of the compressor is adjusted according to the change of the outdoor ambient temperature. When the target minimum operating frequency of the compressor is greater than or equal to the maximum operating frequency of the compressor corresponding to the current outdoor ambient temperature, the maximum operating frequency of the compressor corresponding to the current outdoor ambient temperature is used as the target minimum operating frequency of the compressor.

[0063] In some embodiments of the present invention, the control method of the air conditioner further includes: when it is determined that the target minimum operating frequency of the compressor is in the resonance region, adjusting the target minimum operating frequency of the compressor according to the upper limit frequency value of the resonance region.

[0064] Specifically, after determining the target minimum operating frequency of the compressor according to the operating mode of the air conditioner and the current outdoor ambient temperature, or adjusting the target minimum operating frequency of the compressor according to the exhaust temperature of the compressor and the target exhaust temperature corresponding to the current outdoor ambient temperature, it is also determined whether the target minimum operating frequency of the compressor is in the resonance region. If the target minimum operating frequency of the compressor is in the resonance region, the upper limit frequency value of the resonance region is used as the target minimum operating frequency of the compressor; if the target minimum operating frequency of the compressor is not in the resonance region, the target minimum operating frequency of the compressor is adjusted according to whether the exhaust temperature of the compressor and the target exhaust temperature corresponding to the current outdoor ambient temperature meet the preset conditions, so as to improve the comfort of the air conditioner and the reliability of the compressor.

[0065] As a specific example, Figure 4 As shown, the control method of the air conditioner of the present invention may include the following steps:

[0066] S201, the air conditioner operates in cooling mode.

[0067] S202, obtaining the current outdoor ambient temperature and calculating the target minimum operating frequency of the compressor, F(T4)=a*T4+b.

[0068] S203, determining whether the target minimum operating frequency of the compressor is in the resonance region. If yes, executing step S204; if not, executing step S205.

[0069] S204, taking the minimum frequency outside the resonance region as the target minimum operating frequency of the compressor, and executing S205.

[0070] S205: When the compressor operating frequency is reduced to F(T4)+3 and the duration reaches t1, the compressor exhaust temperature Tp is detected in the following temperature ranges and judged: (1) when T4≤20℃, Tp<Tpaim1; (2) when 20℃<T4≤29℃, Tp<Tpaim2; (3) when 29℃<T4≤40℃, Tp<Tpaim3. If yes, execute step S205; if no, return to step S202.

[0071] S206, adjust F(T4)=m*[a*T4+b], and accumulate the number of times N, where (1) when T4≤20°C, m=1.2; (2) when 20°C<T4≤29°C, m=1.15; (3) when 29°C<T4≤40°C, m=1.1.

[0072] S207, determining whether the adjustment number N of the target minimum operating frequency of the compressor is greater than a preset number (such as 2). If yes, executing step S208; if not, executing step S209.

[0073] S208, obtaining the last target minimum operating frequency of the compressor, and returning to step S202.

[0074] S209, determining whether the target minimum operating frequency of the compressor is less than the maximum operating frequency of the compressor corresponding to the current outdoor ambient temperature. If yes, executing step S210; if not, returning to step S203.

[0075] S210: Taking the maximum operating frequency of the compressor corresponding to the current outdoor ambient temperature as the target minimum operating frequency of the compressor.

[0076] As a specific example, Figure 5 As shown, the control method of the air conditioner of the present invention may include the following steps:

[0077] S301, the air conditioner operates in heating mode.

[0078] S302, obtaining the current outdoor ambient temperature and calculating the target minimum operating frequency of the compressor, F(T4)=c*T4+d.

[0079] S303, determining whether the target minimum operating frequency of the compressor is in the resonance region. If yes, executing step S304; if not, executing step S305.

[0080] S304, taking the minimum frequency outside the resonance region as the target minimum operating frequency of the compressor, and executing S305.

[0081] S305: When the compressor operating frequency is reduced to F(T4)+3 and the duration reaches t2, the compressor exhaust temperature Tp is detected in the following temperature ranges and judged: (1) when T4≤-15℃, Tp<Tpaim4; (2) when -15℃<T4≤-5℃, Tp<Tpaim5; (3) when -5℃<T4≤5℃, Tp<Tpaim6. If yes, execute step S305; if no, return to step S302.

[0082] S306, adjust F(T4)=n*[c*T4+d], and accumulate the number of times N, where (1) when T4≤-15°C, n=1.3; (2) when -15°C<T4≤-5°C, n=1.2; (3) when -5°C<T4≤10°C, n=1.15.

[0083] S307, determining whether the adjustment number N of the target minimum operating frequency of the compressor is greater than a preset number (such as 2). If yes, executing step S308; if not, executing step S309.

[0084] S308, obtaining the last target minimum operating frequency of the compressor, and returning to step S302.

[0085] S309, determining whether the target minimum operating frequency of the compressor is less than the maximum operating frequency of the compressor corresponding to the current outdoor ambient temperature. If yes, execute step S310; if not, return to step S303.

[0086] S310: Taking the maximum operating frequency of the compressor corresponding to the current outdoor ambient temperature as the target minimum operating frequency of the compressor.

[0087] It should be noted that the specific numerical values ​​mentioned above are only used as examples to illustrate the implementation of the present invention in detail, and should not be understood as limiting the present invention. In other examples or implementations or embodiments, other numerical values ​​can be selected according to the present invention, and are not specifically limited here.

[0088] In summary, the present application proposes a linear control method, ① when the air conditioner is running, the outdoor ambient temperature is detected and the temperature zone is determined, and the corresponding target minimum operating frequency of the compressor is calculated using the corresponding formula; ② after the compressor runs to the target minimum operating frequency for a preset time, the exhaust temperature of the compressor and the interval where the outdoor ambient temperature is located are detected to determine whether the preset judgment condition of the exhaust temperature within the temperature interval is met. If so, proceed to the next step, otherwise, maintain the target minimum operating frequency of the existing compressor unchanged; ③ adjust the calculation formula for the corresponding temperature zone, calculate the new target minimum operating frequency of the compressor, and count N times; ④ determine whether the new target minimum operating frequency of the compressor is lower than the temperature interval The highest operating frequency of the compressor in the corresponding temperature zone, if yes, take the new value as the low-frequency limit of the compressor, otherwise, take the highest operating frequency of the compressor in the corresponding temperature zone as the low-frequency limit of the compressor; ⑤ If the target minimum operating frequency of the compressor falls in the resonance zone during the operation of the air conditioner, take the minimum frequency outside the resonance zone as the low-frequency limit of the compressor; ⑥ If the outdoor ambient temperature or the exhaust temperature of the compressor changes during the operation of the air conditioner, re-judge and calculate the target minimum operating frequency of the compressor; ⑦ After N≥2 times, the target minimum operating frequency of the compressor will no longer change. When it is shut down or the mode changes, it will be restored to the target minimum operating frequency of the compressor in ①, and other values ​​and counts will be cleared.

[0089] In summary, according to the control method of the air conditioner of the embodiment of the present invention, the target minimum operating frequency of the compressor is determined according to the operating mode of the air conditioner and the current outdoor ambient temperature. When the compressor is operating at the first preset frequency, the target minimum operating frequency of the compressor is adjusted according to the exhaust temperature of the compressor and the target exhaust temperature corresponding to the current outdoor ambient temperature, wherein the first preset frequency is determined by the target minimum operating frequency of the compressor and is greater than or equal to the target minimum operating frequency. Therefore, the method performs a detailed analysis of the target minimum operating frequency of the compressor according to the operating mode of the air conditioner and the outdoor ambient temperature, and adjusts the target minimum operating frequency in combination with the parameters during the operation of the compressor, thereby improving the comfort of the air conditioner and the reliability of the compressor, and avoiding stalling or frequent shutdowns caused by too low compressor frequency.

[0090] Corresponding to the above embodiment, the present invention further proposes a control device for an air conditioner.

[0091] like Figure 6 As shown, the control device 100 for an air conditioner according to the embodiment of the present invention may include: a first determination module 110 , a second determination module 120 and an adjustment module 130 .

[0092] The first determination module 110 determines the operation mode of the air conditioner. The second determination module 120 determines the target minimum operation frequency of the compressor according to the operation mode of the air conditioner and the current outdoor ambient temperature. When the compressor operates at a first preset frequency and lasts for a first preset time, the adjustment module 130 adjusts the target minimum operation frequency of the compressor according to the exhaust temperature of the compressor and the target exhaust temperature corresponding to the current outdoor ambient temperature, wherein the first preset frequency is determined by the target minimum operation frequency of the compressor and is greater than or equal to the target minimum operation frequency.

[0093] In some embodiments of the present invention, the adjustment module 130 adjusts the target minimum operating frequency of the compressor according to the exhaust temperature of the compressor and the target exhaust temperature corresponding to the current outdoor ambient temperature, and is specifically used for: when the exhaust temperature of the compressor is lower than the target exhaust temperature corresponding to the current outdoor ambient temperature, determining the adjustment coefficient according to the current outdoor ambient temperature; and adjusting the target minimum operating frequency of the compressor according to the adjustment coefficient.

[0094] In some embodiments of the present invention, the second determination module 120 determines the adjustment coefficient according to the current outdoor ambient temperature, specifically for: determining the adjustment coefficient according to the temperature range of the current outdoor ambient temperature; wherein the adjustment coefficient is negatively correlated with the upper limit value of the temperature range.

[0095] In some embodiments of the present invention, the second determination module 120 is further used to: determine the target exhaust temperature according to the temperature range of the current outdoor ambient temperature; wherein the target exhaust temperature is positively correlated with the upper limit of the temperature range.

[0096] In some embodiments of the present invention, the second determination module 120 is further used to determine the target minimum operating frequency of the compressor according to the last determined target minimum operating frequency of the compressor when the number of adjustments of the target minimum operating frequency of the compressor is greater than a preset number.

[0097] In some embodiments of the present invention, the second determination module 120 is also used for: when the number of adjustments of the target minimum operating frequency of the compressor is less than or equal to a preset number, if the target minimum operating frequency of the compressor is greater than or equal to the maximum operating frequency of the compressor corresponding to the current outdoor ambient temperature, the maximum operating frequency of the compressor corresponding to the current outdoor ambient temperature is used as the target minimum operating frequency of the compressor.

[0098] In some embodiments of the present invention, the second determination module 120 is also used to: determine the target minimum operating frequency of the compressor based on the operating mode of the air conditioner and the current outdoor ambient temperature, specifically to: determine the slope and intercept of the linear function based on the operating mode of the air conditioner and the temperature range of the current outdoor ambient temperature; determine the target minimum operating frequency of the compressor based on the linear function and the current outdoor ambient temperature.

[0099] In some embodiments of the present invention, the second determination module 120 is further configured to: when determining that the target minimum operating frequency of the compressor is in the resonance region, adjust the target minimum operating frequency of the compressor according to the upper limit frequency value of the resonance region.

[0100] It should be noted that for details not disclosed in the control device of the air conditioner in the embodiment of the present invention, please refer to the details disclosed in the control method of the air conditioner in the embodiment of the present invention, and no further details will be given.

[0101] According to the control device of the air conditioner of the embodiment of the present invention, the operation mode of the air conditioner is determined, and the target minimum operation frequency of the compressor is determined according to the operation mode of the air conditioner and the current outdoor ambient temperature. When the compressor is operated at the first preset frequency, the adjustment module adjusts the target minimum operation frequency of the compressor according to the exhaust temperature of the compressor and the target exhaust temperature corresponding to the current outdoor ambient temperature. Thus, the device performs a detailed analysis of the target minimum operation frequency of the compressor according to the operation mode of the air conditioner and the outdoor ambient temperature, and adjusts the target minimum operation frequency in combination with the parameters during the operation of the compressor, thereby improving the comfort of the air conditioner and the reliability of the compressor, and avoiding stalling or frequent shutdown caused by too low frequency of the compressor.

[0102] Corresponding to the above embodiment, the present invention also proposes a computer-readable storage medium.

[0103] The computer-readable storage medium of the present invention stores a control program for an air conditioner, and the control program for the air conditioner implements the above-mentioned control method for the air conditioner when executed by a processor.

[0104] The computer-readable storage medium of the embodiment of the present invention can improve the comfort of use of the air conditioner and the reliability of the compressor by executing the above-mentioned air conditioner control method, and avoid stalling or frequent shutdown caused by too low frequency of the compressor.

[0105] Corresponding to the above embodiment, the present invention also proposes an air conditioner.

[0106] like Figure 7As shown, the air conditioner 200 of the embodiment of the present invention includes a memory 210, a processor 220, and an air conditioner control program stored in the memory 210 and executable on the processor 220. When the processor 220 executes the air conditioner control program, the above-mentioned air conditioner control method is implemented.

[0107] According to the air conditioner of the embodiment of the present invention, by executing the above-mentioned air conditioner control method, the use comfort of the air conditioner and the reliability of the compressor can be improved, and the stall or frequent shutdown caused by the compressor frequency being too low can be avoided.

[0108] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection portion with one or more wirings (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0109] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0110] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0111] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0112] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0113] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for controlling an air conditioner, characterized in that: The method comprises: determining an operating mode of the air conditioner; determining a target minimum operating frequency of the compressor according to an operating mode of the air conditioner and a current outdoor ambient temperature; When the compressor operates at a first preset frequency, the target minimum operating frequency of the compressor is adjusted according to the exhaust temperature of the compressor and the target exhaust temperature corresponding to the current outdoor ambient temperature, wherein the first preset frequency is determined by the target minimum operating frequency of the compressor and is greater than or equal to the target minimum operating frequency.

2. The control method according to claim 1, characterized in that: According to the exhaust temperature of the compressor and the target exhaust temperature corresponding to the current outdoor ambient temperature, the target minimum operating frequency of the compressor is adjusted, including: When the exhaust temperature of the compressor is lower than the target exhaust temperature corresponding to the current outdoor ambient temperature, determining the adjustment coefficient according to the current outdoor ambient temperature; The target minimum operating frequency of the compressor is adjusted according to the adjustment coefficient.

3. The control method according to claim 2, characterized in that: Determining the adjustment coefficient according to the current outdoor ambient temperature includes: Determining the adjustment coefficient according to the temperature range of the current outdoor ambient temperature; The adjustment coefficient is negatively correlated with the upper limit of the temperature range.

4. The control method according to claim 2, characterized in that: Also includes: Determining the target exhaust temperature according to the temperature range of the current outdoor ambient temperature; The target exhaust temperature is positively correlated with the upper limit of the temperature range.

5. The control method according to claim 2, characterized in that: Also includes: When the number of adjustments of the target minimum operating frequency of the compressor is greater than a preset number, the target minimum operating frequency of the compressor is determined according to the target minimum operating frequency of the compressor determined last time.

6. The control method according to claim 5, characterized in that: Also includes: When the number of adjustments of the target minimum operating frequency of the compressor is less than or equal to the preset number, if the target minimum operating frequency of the compressor is greater than or equal to the maximum operating frequency of the compressor corresponding to the current outdoor ambient temperature, the maximum operating frequency of the compressor corresponding to the current outdoor ambient temperature shall be used as the target minimum operating frequency of the compressor.

7. The control method according to claim 1, characterized in that: Determining a target minimum operating frequency of the compressor according to the operating mode of the air conditioner and the current outdoor ambient temperature includes: Determining the slope and intercept of the linear function according to the operating mode of the air conditioner and the temperature range of the current outdoor ambient temperature; A target minimum operating frequency of the compressor is determined according to the linear function and the current outdoor ambient temperature.

8. The control method according to any one of claims 1 to 7, characterized in that: Also includes: When it is determined that the target minimum operating frequency of the compressor is in a resonance region, the target minimum operating frequency of the compressor is adjusted according to an upper limit frequency value of the resonance region.

9. A control device for an air conditioner, characterized in that: include: A first determining module, used to determine the operating mode of the air conditioner; A second determination module, configured to determine a target minimum operating frequency of the compressor according to an operating mode of the air conditioner and a current outdoor ambient temperature; An adjustment module is used to adjust the target minimum operating frequency of the compressor according to the exhaust temperature of the compressor and the target exhaust temperature corresponding to the current outdoor ambient temperature when the compressor is operating at a first preset frequency, wherein the first preset frequency is determined by the target minimum operating frequency of the compressor and is greater than or equal to the target minimum operating frequency.

10. A computer-readable storage medium, characterized in that: An air conditioner control program is stored thereon, and when the air conditioner control program is executed by a processor, an air conditioner control method according to any one of claims 1-8 is implemented.

11. An air conditioner, characterized in that: The invention comprises a memory, a processor and a control program of an air conditioner which is stored in the memory and can be run on the processor. When the processor executes the control program of the air conditioner, the control method of the air conditioner according to any one of claims 1 to 8 is implemented.

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