Control methods for multi-split air conditioners, multi-split air conditioners and storage media

Abstract

This invention discloses a control method for a multi-split air conditioner, a multi-split air conditioner, and a storage medium. The method includes: acquiring temperature difference data of an activated indoor unit within a preset time period, the temperature difference data including data corresponding to the temperature difference between the indoor temperature of the corresponding indoor unit and a set temperature; determining a load index for the corresponding indoor unit based on the temperature difference data; determining a target temperature based on the load index, the target temperature being a target value required to be achieved, representing a characteristic temperature characterizing the heat exchange efficiency of the multi-split air conditioner; and controlling the operation of the multi-split air conditioner based on the target temperature. This invention aims to improve indoor comfort and the energy-saving effect of multi-split air conditioners.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more particularly to a control method for multi-split air conditioners, multi-split air conditioners, and storage media. Background Technology

[0002] Multi-split air conditioners typically consist of one outdoor unit and at least two indoor units. The condensing temperature or evaporating temperature characterizes the system's heat exchange efficiency. During operation, the system is generally controlled based on the target condensing temperature or target evaporating temperature. When the actual condensing temperature deviates from the target condensing temperature or the actual evaporating temperature deviates from the target evaporating temperature, the system adjusts the operating parameters of its components to bring the actual temperature back to the corresponding target temperature.

[0003] However, the target condensing temperature or target evaporating temperature in current multi-split air conditioning systems is generally a fixed value obtained from laboratory tests. This can cause the system output capacity to be mismatched with the indoor heat exchange demand, resulting in frequent system start-ups and shutdowns, which leads to poor indoor comfort and system energy-saving performance. Summary of the Invention

[0004] The main objective of this invention is to provide a control method for a multi-split air conditioner, a multi-split air conditioner, and a storage medium, aiming to improve indoor comfort and the energy-saving effect of the multi-split air conditioner.

[0005] To achieve the above objectives, the present invention provides a control method for a multi-split air conditioner, the control method comprising the following steps:

[0006] Acquire temperature difference data of the indoor unit that is turned on within a preset time period. The temperature difference data includes data corresponding to the temperature difference between the indoor temperature of the indoor unit and the set temperature.

[0007] The load index of the indoor unit is determined based on the temperature difference data.

[0008] The target temperature is determined based on the load index, and the target temperature is the target value that needs to be achieved to characterize the heat exchange efficiency of the multi-split air conditioner.

[0009] The operation of the multi-split air conditioner is controlled according to the target temperature.

[0010] Optionally, the temperature difference data includes the temperature difference between the indoor temperature and the set temperature corresponding to different detection times, the end time of the preset time period is the current time, and the step of determining the load index of the indoor unit based on the temperature difference data includes:

[0011] The load index of the indoor unit at the current time is determined based on the temperature difference value corresponding to different detection times and the weight value corresponding to different detection times.

[0012] Optionally, the weight value decreases as the interval between the corresponding detection time and the current time increases.

[0013] Optionally, the step of determining the load index of the indoor unit at the current moment based on the temperature difference value corresponding to different times and the weight value corresponding to different times includes:

[0014] The load index of the corresponding indoor unit at the current moment is determined based on the convolution integral result of the temperature difference function and the weighting function corresponding to the preset time period.

[0015] Wherein, the temperature difference function represents the temperature difference value corresponding to different times, and the weighting function represents the weight value corresponding to different times.

[0016] Optionally, the step of determining the target temperature based on the load index includes:

[0017] The temperature adjustment value is determined based on the load index corresponding to all the indoor units that are turned on;

[0018] Adjust the current target value corresponding to the characteristic temperature according to the temperature adjustment value to obtain the target temperature.

[0019] Optionally, the step of determining the temperature adjustment value based on the load index corresponding to all the activated indoor units includes:

[0020] Determine the maximum and minimum values ​​among all the load indices;

[0021] The temperature adjustment value is determined based on the maximum value and the minimum value.

[0022] Optionally, the step of determining the temperature adjustment value based on the maximum value and the minimum value includes:

[0023] A first adjustment value is determined based on a first coefficient and the maximum value, and a second adjustment value is determined based on a second coefficient and the minimum value;

[0024] The temperature adjustment value is determined based on the first adjustment value and the second adjustment value.

[0025] Optionally, before the steps of determining the first adjustment value based on the first coefficient and the maximum value, and determining the second adjustment value based on the second coefficient and the minimum value, the method further includes:

[0026] The reference value is determined based on the current heat exchange mode of the multi-split air conditioner, either the maximum value or the minimum value.

[0027] The first coefficient and the second coefficient are determined based on the relationship between the reference value and the preset threshold corresponding to the heat exchange mode.

[0028] Optionally, after the step of determining the target temperature based on the load index, the method further includes:

[0029] When the target temperature is less than the preset temperature range, the minimum temperature of the preset temperature range is taken as the target temperature, and the step of controlling the operation of the multi-split air conditioner according to the target temperature is executed.

[0030] When the target temperature is greater than the preset temperature range, the maximum temperature of the preset temperature range is used as the target temperature, and the step of controlling the operation of the multi-split air conditioner according to the target temperature is executed.

[0031] When the target temperature is within the preset temperature range, the step of controlling the operation of the multi-split air conditioner according to the target temperature is executed.

[0032] Optionally, when the multi-split air conditioner is in heating mode, the characteristic temperature is the condensing temperature of the multi-split air conditioner; when the multi-split air conditioner is in cooling mode, the characteristic temperature is the evaporating temperature of the multi-split air conditioner.

[0033] In addition, to achieve the above objectives, this application also proposes a multi-split air conditioner, which includes: a memory, a processor, and a control program for the multi-split air conditioner stored in the memory and executable on the processor. When the control program for the multi-split air conditioner is executed by the processor, it implements the steps of the control method for the multi-split air conditioner as described in any of the above claims.

[0034] In addition, to achieve the above objectives, this application also proposes a storage medium storing a control program for a multi-split air conditioner, wherein the control program for the multi-split air conditioner, when executed by a processor, implements the steps of the control method for the multi-split air conditioner as described in any of the preceding claims.

[0035] This invention proposes a control method for multi-split air conditioners. This method determines the load index of the indoor unit based on the temperature difference data between the indoor temperature and the set temperature over a period of time. Based on the load index, it determines the target value of the characteristic temperature representing the system's heat exchange efficiency and controls the operation of the multi-split air conditioner according to the target temperature. In this process, the target temperature is no longer a fixed value but is determined according to the actual load of the indoor unit, ensuring that the output capacity of the multi-split air conditioner accurately matches the actual indoor load demand, avoiding excessive or insufficient output capacity, thereby improving indoor comfort and the energy-saving effect of the multi-split air conditioner. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the hardware structure involved in the operation of an embodiment of the multi-split air conditioner of the present invention;

[0037] Figure 2 This is a flowchart illustrating an embodiment of the control method for a multi-split air conditioner according to the present invention;

[0038] Figure 3 This is a flowchart illustrating another embodiment of the control method for a multi-split air conditioner according to the present invention;

[0039] Figure 4 This is a flowchart illustrating another embodiment of the control method for a multi-split air conditioner according to the present invention;

[0040] Figure 5 This is a flowchart illustrating another embodiment of the control method for multi-split air conditioners of the present invention.

[0041] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0042] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0043] This invention provides a multi-split air conditioner.

[0044] In this embodiment of the invention, reference is made to Figure 1 A multi-split air conditioner includes a control device 100, an outdoor unit 200, and at least two indoor units 300 connected to the outdoor unit 200, wherein the at least two indoor units 300 are connected in parallel. Both the outdoor unit 200 and the indoor units 300 are connected to the control device 100, which may be located in the indoor unit 300, in the outdoor unit 200, or distributed between the indoor unit 300 and the outdoor unit 200.

[0045] Each indoor unit 300 includes an indoor heat exchanger, an indoor fan corresponding to the indoor heat exchanger, and an electronic expansion valve connected in series with the indoor heat exchanger. Different indoor units 300 are installed in different indoor spaces to regulate the environment of different indoor spaces.

[0046] The outdoor unit 200 includes a throttling device, an outdoor heat exchanger, an outdoor fan corresponding to the outdoor heat exchanger, a commutation assembly, and a compressor.

[0047] At least two indoor heat exchangers, a throttling device, and an outdoor heat exchanger are connected in sequence, and at least two indoor heat exchangers, an outdoor heat exchanger, the return port of the compressor, and the exhaust port of the compressor are all connected to the reversing assembly.

[0048] Under the adjustment of the commutation component, the operating modes of a multi-split air conditioner include at least the following two modes:

[0049] In the first mode, such as the cooling mode, the reversing assembly operates in the first operating state, and the refrigerant discharged by the compressor flows sequentially through the outdoor heat exchanger, the throttling device, and the indoor heat exchanger in the indoor unit 300 which is in the open state before flowing back to the compressor.

[0050] In the second mode, such as the heating mode, the reversing component operates in the second operating state, and the refrigerant discharged by the compressor flows sequentially through the indoor heat exchanger, the throttling device, and the outdoor heat exchanger in the indoor unit 300 which is in the open state before flowing back to the compressor.

[0051] In other embodiments, the multi-split air conditioner can also be an air conditioner with a fixed operating mode. For example, the multi-split air conditioner can be a cooling-only air conditioner, with the compressor exhaust port, outdoor heat exchanger, throttling device, at least two indoor heat exchangers, and compressor return port connected in sequence; or the multi-split air conditioner can be a heating-only air conditioner, with the compressor exhaust port, at least two indoor heat exchangers, throttling device, outdoor heat exchanger, and compressor return port connected in sequence.

[0052] Furthermore, the indoor unit 300 is also equipped with a temperature sensor 01 for detecting the indoor ambient temperature of the regulated indoor space. The temperature sensor 01 can be located at the return air vent of the indoor unit 300. The temperature sensor 01 is connected to the control device 100.

[0053] In this embodiment of the invention, reference is made to Figure 1 The control device 100 for a multi-split air conditioner includes a processor 1001, such as a CPU, a memory 1002, and a timer 1003. These components communicate with each other via a communication bus. The memory 1002 can be high-speed RAM or non-volatile memory, such as a disk drive. Optionally, the memory 1002 can also be a storage device independent of the aforementioned processor 1001.

[0054] Those skilled in the art will understand that Figure 1 The device structure shown does not constitute a limitation on the device and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0055] like Figure 1 As shown, the memory 1002, which serves as a computer storage medium, may include a control program for a multi-split air conditioner.

[0056] exist Figure 1 In the device shown, the processor 1001 can be used to call the control program of the multi-split air conditioner stored in the memory 1002 and execute the relevant steps of the control method of the multi-split air conditioner in the following embodiments.

[0057] This invention also provides a control method for a multi-split air conditioner, applicable to the aforementioned multi-split air conditioner.

[0058] Reference Figure 2 This application proposes an embodiment of a control method for a multi-split air conditioner. In this embodiment, the control method for the multi-split air conditioner includes:

[0059] Step S10: Obtain the temperature difference data of the indoor unit that is turned on within a preset time period. The temperature difference data includes data corresponding to the temperature difference between the indoor temperature of the indoor unit and the set temperature.

[0060] In this embodiment, the end time of the preset time period is the current time, and the duration of the preset time period is a pre-set fixed duration. In other embodiments, the preset time period can also be a time period before the current time that meets preset conditions, such as a preset duration within which the timing starts when the number of indoor units turned on changes.

[0061] The temperature difference data can be the temperature difference between at least two indoor temperatures and the set temperature detected within a preset time period; the temperature difference data can also be the reference temperature difference value obtained by post-processing the at least two temperature difference values ​​between at least two indoor temperatures and the set temperature detected within a preset time period according to preset rules.

[0062] Step S20: Determine the load index corresponding to the indoor unit based on the temperature difference data;

[0063] The load index is a characteristic value that represents the load situation of the indoor space corresponding to the indoor unit.

[0064] Different temperature difference data correspond to different load indices. Specifically, a correspondence between temperature difference data and load indices can be established in advance. This correspondence can include calculation formulas, mapping relationships, or algorithm models. Based on this correspondence, the load index of the indoor unit corresponding to the current temperature difference data can be determined.

[0065] In one implementation, the load index can be calculated by substituting the temperature difference data into a preset formula. In another implementation, the temperature difference data can be analyzed to obtain the temperature fluctuation characteristics between the indoor temperature of the indoor unit and the set temperature within a preset time period, and the load index can be determined based on these fluctuation characteristics.

[0066] Step S30: Determine the target temperature based on the load index. The target temperature is the target value that needs to be achieved to characterize the heat exchange efficiency of the multi-split air conditioner.

[0067] When the multi-split air conditioner is in heating mode, the characteristic temperature is the condensing temperature of the multi-split air conditioner, and the target temperature is the target condensing temperature. When the multi-split air conditioner is in cooling mode, the characteristic temperature is the evaporating temperature of the multi-split air conditioner, and the target temperature is the target evaporating temperature. Specifically, in heating mode, the refrigerant discharged from the compressor flows sequentially through the indoor heat exchanger, the throttling device, and the outdoor heat exchanger in the indoor unit (which is in the open state) before returning to the compressor. In cooling mode, the refrigerant discharged from the compressor flows sequentially through the outdoor heat exchanger, the throttling device, and the indoor heat exchanger in the indoor unit (which is in the open state) before returning to the compressor.

[0068] The target temperature can be determined based on the load index of all the indoor units that are turned on, or it can be determined based on the load index of the indoor units that meets the preset conditions.

[0069] In one implementation, the temperature adjustment value can be determined based on all load indices, and the target temperature can be obtained by adjusting the current target value corresponding to the characteristic temperature based on the temperature adjustment value.

[0070] In another implementation, a corresponding sub-temperature adjustment value can be determined based on each load index, the current target value corresponding to the characteristic temperature can be adjusted based on the sub-temperature adjustment value to obtain the corresponding reference temperature, and the target temperature here can be determined based on all reference temperatures.

[0071] In another implementation, the temperature adjustment direction can be determined based on all load indices, and the target temperature can be obtained by adjusting the current target value corresponding to the characteristic temperature according to the temperature adjustment direction.

[0072] In another implementation, the load characteristic value representing the load of all activated indoor units can be determined based on all load indices, and the target temperature can be determined based on the parameter range in which the load characteristic value is located, or the target temperature can be calculated based on the load characteristic value.

[0073] In this embodiment, the target temperature is determined solely based on the load index of the indoor unit, and the process of determining the target temperature does not involve outdoor environmental parameters.

[0074] Step S40: Control the operation of the multi-split air conditioner according to the target temperature.

[0075] During the process of controlling the operation of the multi-split air conditioner according to the target temperature and maintaining the target duration, the current characteristic temperature of the multi-split air conditioner is detected in real time or for a preset duration. The operation of the target components (such as compressor and / or electronic expansion valve, etc.) in the multi-split air conditioner is controlled according to the current characteristic temperature and the target temperature. When the target duration is reached according to the target temperature control duration, the process returns to step S10.

[0076] In the heating mode of a multi-split air conditioner, if the current characteristic temperature is lower than the target temperature, the compressor can be controlled to increase its operating frequency or the electronic expansion valve can be controlled to decrease its opening. If the current characteristic temperature is higher than the target temperature, the compressor can be controlled to decrease its operating frequency or the electronic expansion valve can be controlled to increase its opening.

[0077] In the cooling mode of a multi-split air conditioner, if the current characteristic temperature is higher than the target temperature, the compressor can be controlled to increase its operating frequency or the electronic expansion valve can be controlled to decrease its opening. If the current characteristic temperature is lower than the target temperature, the compressor can be controlled to decrease its operating frequency or the electronic expansion valve can be controlled to increase its opening.

[0078] The current characteristic temperature of a multi-split air conditioner can be determined based on the coil temperatures of all active indoor units. Different indoor units can be assigned corresponding weights, and the current characteristic temperature is obtained by weighted averaging of all coil temperatures and their corresponding weights. The weights for different indoor units can be determined based on their rated capacity. For example, let T be defined as... 2mean Given the current characteristic temperature of a multi-split air conditioner, and x indoor units currently in operation with nominal capacities of n1, n2, n3…nx KW, and corresponding coil temperatures of the indoor heat exchangers T21, T22, T23…T2x °C, then:

[0079]

[0080] This invention proposes a control method for a multi-split air conditioner. This method determines the load index of the indoor unit based on the temperature difference data between the indoor temperature and the set temperature over a period of time. Based on the load index, it determines the target value of the characteristic temperature representing the system's heat exchange efficiency and controls the operation of the multi-split air conditioner according to the target temperature. In this process, the target temperature is no longer a fixed value but is determined according to the actual load of the indoor unit, ensuring that the output capacity of the multi-split air conditioner accurately matches the actual indoor load demand, avoiding excessive or insufficient output capacity, thereby improving indoor comfort and the energy-saving effect of the multi-split air conditioner.

[0081] Furthermore, in this embodiment, step S30 includes controlling the operation of the multi-split air conditioner according to the new target temperature and maintaining it for the target duration. This target duration can be a pre-set fixed duration or a duration determined based on the actual operation of the multi-split air conditioner. After step S30, the process can return to step S10. Based on this, the system can progressively adjust the target temperature corresponding to the characteristic temperature and dynamically adjust the system output capacity according to the operating conditions of the indoor unit in the multi-split air conditioner, thereby further improving indoor comfort.

[0082] Furthermore, in this embodiment, the load change parameters corresponding to the indoor unit that is turned on in the multi-split air conditioner are obtained; the target duration is determined based on the load change parameters.

[0083] The target duration is positively correlated with the stability characterized by the load change parameter.

[0084] The load change parameter can reflect the load change of the indoor unit within the target time period corresponding to the current moment. In this embodiment, the end time of the target time period is the current moment, and the load change parameter can be determined based on the load indices of at least two indoor units detected within the target time period. The load change parameter may include the load change rate, the load change amplitude, or the stability coefficient corresponding to at least two load indices, etc.

[0085] In this embodiment, at least two load indices are obtained from different times within a preset time period corresponding to the current moment of the indoor unit of the multi-split air conditioner; the stability coefficients of the at least two load indices are determined, and the load change parameters include the stability coefficients.

[0086] During the operation of a multi-split air conditioner, the load index of the indoor units that are turned on can be detected at set intervals, where the set interval is less than a preset time. The start time is defined as the time interval between the current time and the current time, prior to the current time. All load indices detected between the start time and the current time are obtained, resulting in at least two load indices. These at least two load indices are arranged sequentially according to the order of detection times to obtain a load sequence. In other embodiments, the preset time can also be the duration during which the multi-split air conditioner has operated under preset conditions before the current time (e.g., the preset time from the start time when the number of indoor units turned on changes, etc.).

[0087] Stability coefficients include variance and / or standard deviation and / or coefficient of variation, etc. By calculating the variance and / or standard deviation and / or coefficient of variation of the load series, the load variation parameters can be obtained.

[0088] In this implementation, the interval for adjusting the target temperature corresponding to the condensing temperature is determined by adapting to the load change parameters of the indoor unit. This helps to improve the speed at which the indoor load changes reach a stable state, allowing different indoor spaces to quickly reach a comfortable temperature, thereby effectively improving indoor comfort.

[0089] Furthermore, based on the above embodiments, another embodiment of the control method for a multi-split air conditioner of this application is proposed. In this embodiment, the temperature difference data includes the temperature difference value between the indoor temperature and the set temperature corresponding to different detection times, the end time of the preset time period is the current time, and the temperature difference value between the indoor temperature and the set temperature corresponding to the indoor unit can be measured in real time or at intervals (less than the preset time period) during the operation of the multi-split air conditioner. The temperature difference data may include at least two temperature difference values ​​that are continuously or discontinuously detected within the preset time period. Based on this, referring to... Figure 3 Step S20 includes:

[0090] Step S21: Determine the load index of the indoor unit at the current time based on the temperature difference value corresponding to different detection times and the weight value corresponding to different detection times. Different detection times correspond to different weight values.

[0091] The temperature difference value and the weight value are based on a one-to-one correspondence at the detection time.

[0092] When the temperature difference data includes multiple temperature difference values ​​detected at continuous times, the result of integrating multiple temperature difference values ​​and their corresponding weight values ​​over time can be used as the load index of the indoor unit at the current moment.

[0093] When the temperature difference data includes multiple temperature difference values ​​detected at discontinuous times, the load index of the indoor unit at the current time is calculated by weighting the multiple temperature difference values ​​and their corresponding weight values.

[0094] The correspondence between the detection time and the weight value can be a pre-set fixed relationship, or it can be a relationship determined based on the actual operation of the multi-split air conditioner. For example, the correspondence between the detection time and the weight value can be determined by the compressor's exhaust temperature and / or return air temperature and / or the outdoor heat exchanger's temperature change value. Based on this correspondence, the weight value corresponding to the detection time for each temperature difference value can be determined.

[0095] Different detection times correspond to different weight values, and the interval between the detection time and the current time is negatively correlated with the weight value.

[0096] In this embodiment, the weight value decreases as the interval between the detection time and the current time increases. That is, the weight value increases as the interval between the detection time and the current time decreases. Specifically, the weight value decreases linearly or exponentially as the interval between the detection time and the current time increases.

[0097] In this embodiment, the temperature difference value accurately reflects the amount of heat exchange in the indoor space regulated by the indoor unit at the corresponding moment. The current load index is obtained by accumulating the heat exchange represented by the temperature difference value of the indoor unit over a past period according to different time weights. This helps improve the accuracy of target temperature determination, thereby ensuring that the determined target temperature controls the operation of the multi-split air conditioner, further improving indoor comfort and system energy efficiency. Specifically, the weight value decreases as the interval between the corresponding detection moment and the current moment increases. This is beneficial because, under the premise of comprehensively considering the indoor heat exchange demand within a preset time period, the indoor heat exchange demand further away from the current moment contributes less weight to the current load index determination process, further improving the accuracy of the determined target temperature, and thus further improving indoor comfort and energy efficiency.

[0098] Furthermore, in this embodiment, the step of determining the load index of the indoor unit at the current time based on the temperature difference value corresponding to different times and the weight value corresponding to different times includes: determining the load index of the indoor unit at the current time based on the convolution integral result of the temperature difference function and the weight function corresponding to the preset time period; wherein, the temperature difference function represents the temperature difference value corresponding to different times, and the weight function represents the weight value corresponding to different times.

[0099] For example, the load index at the current moment can be calculated using the following formula:

[0100]

[0101] Where LDI(τ) is the load index at the current moment, t is the total duration of the preset time period, ε(τ) is the temperature difference function, and α t-τ This is the weighting function.

[0102] In this embodiment, the load index at the current moment is calculated by convolution, which helps to further improve the accuracy of the determined target temperature, thereby further improving indoor comfort and energy efficiency.

[0103] Furthermore, based on any of the above embodiments, another embodiment of the control method for multi-split air conditioners of this application is proposed. In this embodiment, reference is made to... Figure 4 Step S30 includes:

[0104] Step S31: Determine the temperature adjustment value based on the load index corresponding to all the indoor units that are turned on;

[0105] Determine the load characteristic values ​​(e.g., maximum and / or minimum and / or median and / or average, etc.) that represent the load conditions of all operating indoor units among all load indices, and adjust the temperature value based on the load characteristic values. Alternatively, the temperature adjustment value can be obtained by weighting all load indices according to the weight values ​​of the corresponding indoor units.

[0106] Temperature adjustment values ​​may include temperature adjustment magnitude or temperature adjustment coefficient.

[0107] Step S32: Adjust the current target value corresponding to the characteristic temperature according to the temperature adjustment value to obtain the target temperature.

[0108] When the temperature adjustment value is the temperature adjustment amplitude, the difference or sum of the current target value corresponding to the characteristic temperature and the temperature adjustment amplitude is used as the target temperature.

[0109] When the temperature adjustment value is the temperature adjustment coefficient, the product of the current target value corresponding to the characteristic temperature and the temperature adjustment coefficient is used as the target temperature.

[0110] In this embodiment, the temperature adjustment value is determined by comprehensively considering the load index corresponding to all the indoor units that are turned on, and the target value of the characteristic temperature is adjusted accordingly. This ensures that when the air conditioner is running at the determined target temperature, the overall comfort of each indoor space can be effectively improved while saving energy.

[0111] Furthermore, the step of determining the temperature adjustment value based on the load index corresponding to all the activated indoor units includes: determining the maximum and minimum values ​​among all the load indices; and determining the temperature adjustment value based on the maximum and minimum values.

[0112] In one implementation, the temperature adjustment value can be determined based on the average of the maximum and minimum values. In another implementation, the temperature adjustment value can be determined based on the interval containing the maximum and minimum values. In yet another implementation, the temperature adjustment value can be calculated by inserting the maximum and minimum values ​​into a formula.

[0113] In this embodiment, the target temperature is obtained by adjusting the temperature adjustment value determined by combining the maximum and minimum values ​​among all load indices. This helps to further ensure that the operation of the multi-split air conditioning system can effectively meet the overall comfort and energy-saving requirements of all indoor spaces.

[0114] Furthermore, in this embodiment, a first adjustment value is determined based on a first coefficient and the maximum value, and a second adjustment value is determined based on a second coefficient and the minimum value; the temperature adjustment value is determined based on the first adjustment value and the second adjustment value.

[0115] The first and second coefficients can be preset fixed values, or they can be determined based on the actual operation of the air conditioner.

[0116] For example, the target temperature can be calculated using the following formula:

[0117] T 2target =T 2target_ -C1*max(LDI i )-C2*min(LDI i );

[0118] Among them, T 2target The target temperature is given by C1, the first coefficient, and C2, the second coefficient. Both C1 and C2 are greater than or equal to 0. max(LDI) i ) is the maximum value, min(LDI) i If ) is the minimum value, then C1*max(LDI) i ) is the first adjustment value, C2*min(LDI) i The first adjustment value is the second adjustment value, and the sum of the first and second adjustment values ​​is the temperature adjustment value.

[0119] Furthermore, in this embodiment, before the steps of determining the first adjustment value based on the first coefficient and the maximum value, and determining the second adjustment value based on the second coefficient and the minimum value, the method further includes: determining one of the maximum value and the minimum value as a reference value based on the heat exchange mode currently operating in the multi-split air conditioner; and determining the first coefficient and the second coefficient based on the relationship between the reference value and a preset threshold corresponding to the heat exchange mode.

[0120] The reference value for cooling mode is the maximum value, and the reference value for heating mode is the minimum value. Because the magnitudes are different, the first and second coefficients will differ.

[0121] For example, in cooling mode, if the maximum value is <0, then C1 = 0, C2 ≠ 0, and C2 can be a value greater than 0 and less than or equal to 1, which is used to represent the increase of the target temperature with the maximum load index; if the maximum value is ≥0, then C1 ≠ 0, C2 = 0, and C1 can be a value greater than 0 and less than or equal to 1, which is used to represent the decrease of the target temperature with the maximum load index.

[0122] In this embodiment, the above method helps to improve the accuracy of target temperature adjustment, thereby ensuring that the operation of the multi-split air conditioning system can effectively meet the overall comfort and energy saving of all indoor spaces.

[0123] Furthermore, based on any of the above embodiments, another embodiment of the control method for multi-split air conditioners of this application is proposed. In this embodiment, reference is made to... Figure 5 After step S30, the method further includes:

[0124] Step S401: When the target temperature is less than the preset temperature range, the minimum temperature of the preset temperature range is taken as the target temperature, and the step of controlling the operation of the multi-split air conditioner according to the target temperature is executed.

[0125] The preset temperature range is specifically the target range of the characteristic temperature that a multi-split air conditioner can achieve when it simultaneously meets the requirements of indoor comfort and reliable operation.

[0126] The preset temperature range can be a fixed range set in advance, or a range determined according to the actual operation of the multi-split air conditioner. For example, it can be determined based on the change in the compressor's exhaust temperature and / or return gas temperature and / or the temperature change of the coil in the indoor unit that is turned on and / or the compressor's gas supply temperature.

[0127] Step S402: When the target temperature is greater than the preset temperature range, the maximum temperature of the preset temperature range is used as the target temperature, and the step of controlling the operation of the multi-split air conditioner according to the target temperature is executed.

[0128] Step S403: When the target temperature is within the preset temperature range, execute the step of controlling the operation of the multi-split air conditioner according to the target temperature.

[0129] In this embodiment, when the target temperature deviates from the preset temperature range, it indicates that the indoor comfort or system operation reliability is insufficient. At this time, the critical value of the preset temperature range is used as the target temperature to control the operation of the multi-split air conditioner. When the target temperature is within the preset temperature range, it indicates that both indoor comfort and system operation reliability are in a good state. At this time, the operation of the multi-split air conditioner will be controlled according to the current target temperature, which is conducive to further improving energy efficiency and indoor comfort while ensuring operational reliability.

[0130] Furthermore, this embodiment of the invention also proposes a storage medium storing a control program for a multi-split air conditioner. When the control program for the multi-split air conditioner is executed by a processor, it implements the relevant steps of any embodiment of the control method for the multi-split air conditioner described above.

[0131] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0132] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0133] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, multi-split air conditioner, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0134] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A control method for a multi-split air conditioner, characterized in that, The control method for the multi-split air conditioner includes the following steps: The temperature difference data of the indoor unit that is turned on is obtained within a preset time period. The temperature difference data includes the temperature difference between the indoor temperature and the set temperature of the indoor unit corresponding to different detection times. The end time of the preset time period is the current time. The load index of the corresponding indoor unit at the current moment is determined based on the convolution integral result of the temperature difference function and the weight function corresponding to the preset time period. The temperature difference function represents the temperature difference value corresponding to different detection times, and the weight function represents the weight value corresponding to different detection times. The weight value decreases as the interval between the corresponding detection time and the current time increases. The target temperature is determined based on the load index, and the target temperature is the target value that needs to be achieved to characterize the heat exchange efficiency of the multi-split air conditioner. The operation of the multi-split air conditioner is controlled according to the target temperature.

2. The control method for a multi-split air conditioner as described in claim 1, characterized in that, The step of determining the target temperature based on the load index includes: The temperature adjustment value is determined based on the load index corresponding to all the indoor units that are turned on; Adjust the current target value corresponding to the characteristic temperature according to the temperature adjustment value to obtain the target temperature.

3. The control method for a multi-split air conditioner as described in claim 2, characterized in that, The step of determining the temperature adjustment value based on the load index corresponding to all the activated indoor units includes: Determine the maximum and minimum values ​​among all the load indices; The temperature adjustment value is determined based on the maximum value and the minimum value.

4. The control method for a multi-split air conditioner as described in claim 3, characterized in that, The step of determining the temperature adjustment value based on the maximum value and the minimum value includes: A first adjustment value is determined based on a first coefficient and the maximum value, and a second adjustment value is determined based on a second coefficient and the minimum value; The temperature adjustment value is determined based on the first adjustment value and the second adjustment value.

5. The control method for a multi-split air conditioner as described in claim 4, characterized in that, Before the steps of determining the first adjustment value based on the first coefficient and the maximum value, and determining the second adjustment value based on the second coefficient and the minimum value, the method further includes: The reference value is determined based on the current heat exchange mode of the multi-split air conditioner, either the maximum value or the minimum value. The first coefficient and the second coefficient are determined based on the relationship between the reference value and the preset threshold corresponding to the heat exchange mode.

6. The control method for a multi-split air conditioner as described in claim 1, characterized in that, Following the step of determining the target temperature based on the load index, the method further includes: When the target temperature is less than the preset temperature range, the minimum temperature of the preset temperature range is taken as the target temperature, and the step of controlling the operation of the multi-split air conditioner according to the target temperature is executed. When the target temperature is greater than the preset temperature range, the maximum temperature of the preset temperature range is used as the target temperature, and the step of controlling the operation of the multi-split air conditioner according to the target temperature is executed. When the target temperature is within the preset temperature range, the step of controlling the operation of the multi-split air conditioner according to the target temperature is executed.

7. The control method for a multi-split air conditioner as described in claim 1, characterized in that, When the multi-split air conditioner is in heating mode, the characteristic temperature is the condensing temperature of the multi-split air conditioner; when the multi-split air conditioner is in cooling mode, the characteristic temperature is the evaporating temperature of the multi-split air conditioner.

8. A multi-split air conditioner, characterized in that, The multi-split air conditioner includes: a memory, a processor, and a control program for the multi-split air conditioner stored in the memory and executable on the processor. When the control program for the multi-split air conditioner is executed by the processor, it implements the steps of the control method for the multi-split air conditioner as described in any one of claims 1 to 7.

9. A storage medium, characterized in that, The storage medium stores a control program for a multi-split air conditioner, which, when executed by a processor, implements the steps of the control method for a multi-split air conditioner as described in any one of claims 1 to 7.

Images