A multi-split air conditioner

Abstract

The application discloses a multi-connected air conditioner, which comprises an outdoor unit and multiple indoor units; the outdoor unit comprises a first controller and a first temperature detecting unit connected with the first controller; the first temperature detecting unit is used for detecting the outdoor environment temperature and transmitting the outdoor environment temperature to the first controller; the indoor unit comprises a second controller, a second temperature detecting unit connected with the second controller and an indoor throttle valve; the second temperature detecting unit is used for detecting the indoor return air temperature and transmitting the indoor return air temperature to the second controller; each second controller is in communication connection with the first controller, the outdoor environment temperature and the indoor return air temperature of multiple time periods are acquired in a day cycle, and the opening degree of the indoor throttle valve under the same time period and the outdoor environment temperature is corrected according to the change value of the indoor return air temperature of each time period. According to the application, the indoor throttle valve is adjusted according to the installation parameters of each indoor unit, the refrigerant flow is adjusted, and the comfort and energy saving are improved.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, specifically to a multi-split air conditioner. Background Technology

[0002] In current domestic buildings, the installation environments of the indoor units of multi-split air conditioning systems vary, resulting in different heating and cooling loads for each indoor unit. This leads to different indoor units not being able to meet demand effectively, or even frequently starting and stopping, increasing energy consumption and failing to guarantee user comfort and energy efficiency.

[0003] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Summary of the Invention

[0004] In response to the issues raised in the background art regarding the impact of the installation environment of each indoor unit of a multi-split air conditioner on comfort and energy efficiency, this invention proposes a multi-split air conditioner that adjusts the opening of the indoor throttling valve according to the installation environment parameters to improve comfort, thereby reducing frequent temperature adjustments and start-stop cycles and improving energy efficiency.

[0005] To achieve the above-mentioned objectives, the present invention employs the following technical solution: a multi-split air conditioner, comprising an outdoor unit and multiple indoor units; The outdoor unit includes a first controller and a first temperature detection unit connected thereto; the first temperature detection unit is used to detect the outdoor ambient temperature and transmit it to the first controller. The indoor unit includes a second controller and a second temperature detection unit and an indoor throttling valve connected thereto. The second temperature detection unit is used to detect the indoor return air temperature and transmit it to the second controller. Each of the second controllers is communicatively connected to the first controller and acquires the outdoor ambient temperature and the indoor return air temperature for multiple time periods on a daily basis. The opening degree of the indoor throttling valve is corrected according to the change value of the indoor return air temperature in each time period and the outdoor ambient temperature.

[0006] The multi-split air conditioner of this invention adjusts the opening of the indoor throttling valve of each indoor unit according to the change value of the indoor return air temperature over a time period, i.e., the rate of change of the return air temperature. This is used to eliminate or balance the problem of increased or decreased heating and cooling loads caused by the installation location, such as increased cooling load and decreased heating load caused by western exposure during the cooling or heating season. This makes the refrigerant distribution of the multi-split air conditioner system more reasonable and the temperature adjustment of each cooling or heating space more comfortable, improving comfort and thus enhancing the user experience. In addition, when the load decreases, the refrigerant flow is reduced, reducing the power of the multi-split air conditioner and thus reducing power consumption.

[0007] In some specific embodiments, the second controller is preset with a first temperature threshold and a second temperature threshold lower than it, a first correction coefficient, a second correction coefficient, and a third correction coefficient that increase sequentially; and is configured as follows: The return air temperature change values ​​for the same time period on each day are grouped according to the outdoor ambient temperature, and the maximum value of the return air temperature change value in each group is obtained. Obtain the return air temperature change value of each indoor unit in each time period, group them according to the time period and the outdoor ambient temperature, and obtain the average value of each group; Compare the maximum value with the average value under the corresponding time period and outdoor ambient temperature; determine the difference between the maximum value and the average value; if it is higher than the first temperature threshold, multiply the opening degree of the indoor throttle valve under the same time period and outdoor ambient temperature by the first correction coefficient; if it is between the second temperature threshold and the first temperature threshold, multiply the opening degree of the indoor throttle valve under the same time period and outdoor ambient temperature by the second correction coefficient; if it is lower than the second temperature threshold, multiply the opening degree of the indoor throttle valve under the same time period and outdoor ambient temperature by the third correction coefficient.

[0008] In this embodiment, the multi-split air conditioner compares the difference between the maximum and average return air temperature changes over a time period with a first temperature threshold and a second temperature threshold to identify indoor units with smaller return air temperature changes due to larger heat or cooling loads. The indoor unit's throttle valve opening is then adjusted to the normal opening multiplied by a larger third correction coefficient to increase refrigerant flow, thereby improving cooling or heating speed and enhancing user comfort and experience. Conversely, by comparing the difference between the maximum and average return air temperature changes over a time period with the first and second temperature thresholds to identify indoor units with larger return air temperature changes due to smaller heat or cooling loads, the indoor unit's throttle valve opening is adjusted to the normal opening multiplied by a smaller first correction coefficient to reduce refrigerant flow, preventing overcooling or overheating. This not only improves user comfort but also reduces power consumption and enhances energy efficiency.

[0009] In some specific embodiments, the time period is a whole hour from half an hour after power-on; The first correction factor is a positive number less than 1; the second correction factor is 1; and the third correction factor is a number greater than 1.

[0010] In this embodiment, the multi-split air conditioner uses one hour as the length of the time period, which is consistent with the speed at which the air conditioner changes the temperature of the space by cooling and heating, making the difference more obvious and improving the accuracy of control and correction.

[0011] In some specific embodiments, the second controller acquires the outdoor ambient temperature and the number of temperature adjustments over multiple time periods on a daily basis, and adjusts the target value of the evaporation temperature and the indoor fan speed for the same time period and the same outdoor ambient temperature based on the average number of temperature adjustments over the same time period.

[0012] This embodiment of the multi-split air conditioner obtains user habits, temperature sensitivity, and tolerance by statistically analyzing the number of temperature adjustments. Based on this information, it adjusts the target evaporation temperature and indoor fan speed to ensure the indoor unit's temperature control strategy prioritizes either high comfort or energy efficiency. This achieves the goal of meeting user needs or improving energy conservation.

[0013] In some specific embodiments, the second controller is configured as follows: The number of temperature adjustments within each time period is divided into the number of temperature increases and the number of temperature decreases. The number of times the temperature rises and the number of times the temperature falls within each time period are grouped according to the outdoor ambient temperature, and the average number of times the temperature rises and the average number of times the temperature falls in each group are obtained. Adjust the target value of the evaporation temperature and the indoor fan speed according to the same time period and the outdoor ambient temperature, based on the average number of heating times and the average number of cooling times.

[0014] This multi-split air conditioner differentiates between heating and cooling, adjusting the target evaporation temperature and indoor fan speed based on the average of the number of heating and cooling cycles. When heating increases significantly, it increases heating power and decreases the indoor fan speed to improve comfort and reduce power consumption. When cooling increases significantly, it increases cooling power while decreasing the indoor fan speed to maintain cooling temperature and improve comfort. When heating decreases frequently, it decreases heating power and increases the indoor fan speed to maintain heating temperature and improve comfort. When cooling decreases frequently, it decreases cooling power and increases the indoor fan speed to increase indoor temperature and maintain comfort.

[0015] In some specific embodiments, the second controller is preset with a first number threshold and a second number threshold less than it, a first correction parameter, a second correction parameter, and a third correction parameter that increase sequentially, and also presets a fourth correction coefficient and a fifth correction coefficient; The second controller is configured as follows: Compare the average number of heating cycles with the first number threshold and the second number threshold; If the average number of heating cycles is higher than the first threshold value, the indoor fan speed adjustment value is β1 + β1 * HPi * K4; the adjustment value of the target evaporation temperature is β1 * K5. If the average number of heating cycles is between the second number threshold and the first number threshold, the indoor fan speed adjustment value is β2 + β2 * HPi * K4; the adjustment value of the target evaporation temperature is β2 * K5. If the average number of heating cycles is lower than the second threshold value, the indoor fan speed adjustment value is β3 + β3 * HPi * K4; the adjustment value of the evaporation temperature target value is β3 * K5. β1, β2, and β3 are the first correction parameter, the second correction parameter, and the third correction parameter, respectively; HPi is the indoor unit power; K4 and K5 are the fourth correction coefficient and the fifth correction coefficient, respectively.

[0016] The multi-split air conditioner in this embodiment corrects the target value of the evaporation temperature and the indoor fan speed by setting a threshold for the average number of heating cycles and corresponding correction parameters. When the heating temperature rises significantly, the heating power is increased and the indoor fan speed is reduced to improve comfort during heating and reduce power consumption. When the cooling temperature rises significantly, the cooling power is increased while the indoor fan speed is reduced to ensure the cooling temperature and improve comfort.

[0017] In some specific embodiments, the second controller is preset with a fourth correction parameter, a fifth correction parameter, and a sixth correction parameter that decrease sequentially, and is configured as follows: Compare the average number of cooling cycles with the first number threshold and the second number threshold; If the average number of cooling cycles is higher than the first threshold value, the indoor fan speed adjustment value is β4 + β4 * HPi * K4; the adjustment value of the evaporation temperature target value is β4 * K5. If the average number of cooling cycles is between the second number threshold and the first number threshold, the indoor fan speed adjustment value is β5 + β5 * HPi * K4; the adjustment value of the evaporation temperature target value is β5 * K5. If the average number of cooling cycles is lower than the second threshold value, the indoor fan speed adjustment value is β6 + β6 * HPi * K4; the adjustment value of the evaporation temperature target value is β6 * K5. β4, β5, and β6 are the fourth, fifth, and sixth correction parameters, respectively.

[0018] In this embodiment, the multi-split air conditioner presets a threshold number of cooling cycles and corresponding correction parameters to adjust the target value of the evaporation temperature and the indoor fan speed. When there are many heating cooling cycles, the heating power is reduced and the indoor fan speed is increased to ensure heating temperature while improving comfort. When there are many cooling cycles, the cooling power is reduced and the indoor fan speed is increased to increase indoor temperature while ensuring comfort.

[0019] In some specific embodiments, the second controller is preset with a seventh correction parameter, an eighth correction parameter, and a ninth correction parameter that decrease sequentially. It is also preset with a four-way valve state value, a third-order threshold, and a fourth-order threshold less than these parameters, and is further configured as follows: The number of shutdowns and the outdoor ambient temperature are obtained in multiple time periods on a daily basis; the number of shutdowns in each time period is grouped according to the outdoor ambient temperature, and the average number of shutdowns in each group is obtained. Compare the average number of shutdowns with the third threshold and the fourth threshold; If the average number of shutdowns is higher than the threshold value for the third shutdown, the indoor fan speed adjustment value is β7 + β7 * HPi * K4; the adjustment value for the target evaporation temperature is β7 * K5. If the average number of shutdowns is between the fourth threshold and the third threshold, the indoor fan speed adjustment value is β8 + β8 * HPi * K4; the adjustment value of the evaporation temperature target value is β8 * K5. If the average number of shutdowns is lower than the fourth threshold, the indoor fan speed adjustment value is β9 + β9 * HPi * K4; the evaporation temperature target value is adjusted to β9 * K5. β7, β8, and β9 are the products of the seventh correction parameter and the four-way valve state value, the eighth correction parameter and the four-way valve state value, and the ninth correction parameter and the four-way valve state value, respectively; during cooling, the four-way valve state value is -1; during heating, the four-way valve state value is 1.

[0020] This embodiment of the multi-split air conditioner adjusts the target evaporation temperature and indoor fan speed based on a preset threshold for the average number of shutdowns and corresponding correction parameters. When the number of shutdowns during heating is high, the heating power is reduced and the indoor fan speed is increased to maintain heating temperature while improving comfort. Conversely, when the number of shutdowns during cooling is high, the cooling power is increased and the indoor fan speed is decreased to maintain cooling temperature while improving comfort. In other words, as the number of shutdowns during heating increases, the heating power is significantly reduced and the indoor fan speed is increased to maintain heating temperature while improving airflow and thus comfort. Similarly, as the number of shutdowns during cooling increases, the cooling power is significantly increased and the indoor fan speed is decreased to maintain cooling temperature while increasing direct, high-volume cooling airflow and thus improving comfort.

[0021] In some specific embodiments, the first correction parameter, the second correction parameter, and the third correction parameter are opposites of the fourth correction parameter, the fifth correction parameter, and the sixth correction parameter, respectively. The seventh correction parameter, the eighth correction parameter, and the ninth correction parameter are respectively equal to the fourth correction parameter, the fifth correction parameter, and the sixth correction parameter; The third number threshold is equal to the first number threshold; the fourth number threshold is less than the second number threshold.

[0022] In this embodiment, the multi-split air conditioner has a greater impact on the stability and power consumption of the air conditioning system when it is turned off. Therefore, the values ​​of the third and fourth thresholds are adjusted to allow for greater adjustment of the evaporation temperature target value and indoor fan speed when the unit is turned off, thereby improving user comfort and reducing power consumption.

[0023] In some specific embodiments, the outdoor unit further includes a compressor, which is connected to and controlled by the first controller; The first controller is pre-set with three levels of electricity price that increase sequentially: a first level, a second level, and a third level. It is also pre-set with a sixth, a seventh, an eighth, and a ninth correction coefficient, configured as follows: Determine the electricity price level for the current time; If the electricity price is at the first level, the operating frequency of the compressor is increased by HP*K6, the rate of increase and decrease of the operating frequency is multiplied by HP*K7, and the target superheat is increased by K8. If the electricity price is at the second level, the operating frequency of the compressor will not be adjusted, the rate of increase and decrease of the operating frequency will not be adjusted, and the target superheat will not be adjusted. If the electricity price is at the third level, the operating frequency of the compressor is reduced by HP*K6, the rate of increase and decrease of the operating frequency is multiplied by HP*K9, and the target superheat is reduced by K8. Wherein, K6, K7, K8, and K9 are the sixth, seventh, eighth, and ninth correction coefficients, respectively; HP is the outdoor unit power.

[0024] This embodiment of the multi-split air conditioner divides electricity prices into three levels: the first level is the capacity priority level, which prioritizes meeting capacity needs; the second level is the middle value of the electricity price, which is set as the equilibrium level, and does not adjust the operating frequency, frequency increase and decrease rates, or target superheat value; the third level is the high electricity price level, which is set as the energy-saving priority level, and adjusts the compressor's operating frequency by decreasing the frequency, adjusting the frequency increase and decrease rates respectively, reducing the target superheat, thereby reducing operating power and achieving the purpose of energy saving.

[0025] Other features and advantages of the present invention will become clearer after reading the detailed embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the components and connection structure of a multi-split air conditioner according to an embodiment; Figure 2 This is a schematic diagram of the control flow of a multi-split air conditioner according to an embodiment; Figure 3 This is a schematic diagram of the control flow of a multi-split air conditioner according to an embodiment; Figure 4 This is a schematic diagram of the control flow of a multi-split air conditioner according to an embodiment; Figure 5 This is a schematic diagram of the control flow of a multi-split air conditioner according to an embodiment; Figure 6 This is a schematic diagram of the control flow of a multi-split air conditioner according to an embodiment; Figure 7 This is a schematic diagram of the control flow of a multi-split air conditioner according to an embodiment; Figure 8 This is a schematic diagram of the control flow of a multi-split air conditioner according to an embodiment; Figure 9 This is a schematic diagram of the components and connection structure of a multi-split air conditioner according to an embodiment; Figure 10 This is a schematic diagram of the control flow of a multi-split air conditioner according to an embodiment.

[0028] Figure label, 1. Outdoor unit; 11. First controller; 12. First temperature detection unit; 13. Four-way valve; 14. Compressor; 2. Indoor unit; 21. Second controller; 22. Second temperature detection unit; 23. Indoor throttle valve; 24. Indoor fan. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0031] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0032] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0035] Air conditioners execute a refrigeration cycle using a compressor, condenser, expansion valve, and evaporator. The refrigeration cycle involves a series of processes, including compression, condensation, expansion, and evaporation, to cool or heat an indoor space.

[0036] Low-temperature, low-pressure refrigerant enters the compressor, which compresses it into a high-temperature, high-pressure refrigerant gas and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0037] The expansion valve expands the high-temperature, high-pressure liquid refrigerant that condenses in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the expanded refrigerant in the expansion valve, returning the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves its cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material being cooled. Throughout the cycle, the air conditioner regulates the temperature of the indoor space.

[0038] The outdoor unit of an air conditioner refers to the part of the refrigeration cycle that includes the compressor and the outdoor heat exchanger. The indoor unit of an air conditioner includes the indoor heat exchanger, and an expansion valve can be provided in either the indoor or outdoor unit.

[0039] The indoor and outdoor heat exchangers function as either condensers or evaporators. When the indoor heat exchanger is used as a condenser, the air conditioner functions as a heater in heating mode; when the indoor heat exchanger is used as an evaporator, the air conditioner functions as a cooler in cooling mode.

[0040] Reference Figure 1 , Figure 2 , Figure 9 The multi-split air conditioner of the present invention includes an outdoor unit 1 and multiple indoor units 2; the refrigerant circulation system of each indoor unit 2 is connected to the refrigerant circulation system of the outdoor unit 1 to form a complete refrigerant circulation system for cooling or heating.

[0041] The outdoor unit 1 includes a first controller 11 and a first temperature detection unit 12 connected to the first controller 11; the first temperature detection unit 12 is used to detect the outdoor ambient temperature and transmit it to the first controller 11.

[0042] The indoor unit 2 includes a second controller 21, a second temperature detection unit 22 connected to the second controller 21, and an indoor throttling valve 23. The second temperature detection unit 22 is used to detect the indoor return air temperature and transmit it to the second controller 21. The opening degree of the indoor throttling valve 23 is controlled by the second controller 21 to adjust the flow rate of refrigerant flowing into the indoor unit 2, thereby adjusting the heating or cooling capacity of the corresponding indoor unit 2.

[0043] Each second controller 21 is communicatively connected to the first controller 11, and acquires outdoor ambient temperature and indoor return air temperature over multiple time periods on a daily basis after installation or power-on. It then adjusts the opening of the indoor throttling valve 23 at the same outdoor ambient temperature based on the change in indoor return air temperature over each time period within the outdoor ambient temperature. In other words, the opening of the indoor throttling valve 23 at the same outdoor ambient temperature is adjusted according to the rate of change of indoor return air temperature within the outdoor ambient temperature.

[0044] The multi-split air conditioner of this invention adjusts the opening of the indoor throttling valve 23 of each indoor unit 2 according to the change value of the indoor return air temperature over a time period, i.e., the rate of change of the return air temperature. This is used to eliminate or balance the problem of increased or decreased heating and cooling loads caused by the installation location, such as increased cooling load and decreased heating load caused by western exposure during the cooling or heating season. This makes the refrigerant distribution of the multi-split air conditioner system more reasonable and the temperature adjustment of each cooling or heating space more comfortable, improving comfort and thus enhancing the user experience. In addition, when the load decreases, the refrigerant flow is reduced, reducing the power of the multi-split air conditioner and thus reducing power consumption.

[0045] The specific structural composition, control process, and principle of the multi-split air conditioner of the present invention will be described in detail below through specific embodiments.

[0046] In some specific embodiments, the outdoor ambient temperature and indoor return air temperature are acquired in multiple time periods over a specified period of time, with a daily cycle. The specified period of time is multiple days. The timing of acquiring the outdoor ambient temperature and indoor return air temperature can be controlled according to the power-on status or the outdoor ambient temperature. That is, when the multi-split air conditioner is powered on or during seasonal changes, the opening degree of the indoor throttling valve 23 is adjusted in real time based on the outdoor ambient temperature and indoor return air temperature acquired in multiple time periods over a daily cycle within the specified period of time.

[0047] In this embodiment, the multi-split air conditioner re-adjusts the opening degree of the indoor throttle valve 23 according to the power-on and seasonal changes, so that the control is updated in real time with the use of the multi-split air conditioner, making the heating and cooling capacity of the indoor unit 2 more reasonable.

[0048] In some specific embodiments, the indoor throttle valve 23 is an electronic expansion valve.

[0049] In some specific embodiments, refer to Figure 1 , Figure 2 , Figure 3The second controller 21 is preset with a first temperature threshold and a second temperature threshold lower than the first temperature threshold, and a first correction coefficient, a second correction coefficient, and a third correction coefficient that increase sequentially. The first correction coefficient, the second correction coefficient, and the third correction coefficient are all constants obtained through experiments, and are configured as follows: S11. Obtain the return air temperature and outdoor ambient temperature for multiple time periods on a daily basis; obtain the return air temperature change value for each time period based on the obtained return air temperature. S12. The return air temperature change values ​​for each time period are grouped according to the outdoor ambient temperature, and the maximum value is obtained. That is, the return air temperature change values ​​for each time period of each day within the specified time length are grouped according to the time period and the outdoor ambient temperature. For example, the return air temperature change values ​​of indoor unit 2 measured on multiple days during a certain time period of a day with the same outdoor ambient temperature are grouped in the same group, and the maximum value of the return air temperature change value of each group is obtained to obtain the maximum load of indoor unit 2 under the corresponding time period and outdoor temperature. S13. Obtain the average value of the return air temperature change of each indoor unit 2 under the same outdoor ambient temperature in each time period; that is, the average value is the average value of the return air temperature change of each indoor unit 2 over multiple days with the same outdoor ambient temperature in the same time period. S14. Compare the maximum value with the average value; S15. Determine whether the difference between the maximum value and the average value is higher than the first temperature threshold; if yes, proceed to S16; if no, proceed to S17. S16. The opening degree of the indoor throttling valve 23 under the corresponding time period and outdoor ambient temperature is multiplied by the first correction factor, so that the refrigerant flow into the indoor unit 2 under the corresponding time period and outdoor ambient temperature is smaller than the normal flow. S17. Determine whether the difference between the maximum value and the average value is between the second temperature threshold and the first temperature threshold; if yes, proceed to S18; if no, proceed to S19. S18. The opening degree of the indoor throttling valve 23 under the corresponding time period and outdoor ambient temperature is multiplied by the second correction factor; so that the refrigerant flow into the indoor unit 2 under the corresponding time period and outdoor ambient temperature remains unchanged or changes slightly compared to the normal flow. S19. The opening degree of the indoor throttling valve 23 under the corresponding time period and outdoor ambient temperature is multiplied by the third correction coefficient; that is, when the difference between the maximum value and the average value is lower than the second temperature threshold, the opening degree of the indoor throttling valve 23 under the corresponding time period and outdoor ambient temperature is multiplied by the third correction coefficient, so that the refrigerant flow into the indoor unit 2 under the corresponding time period and outdoor ambient temperature is greater than the normal flow.

[0050] In this embodiment, the multi-split air conditioner compares the difference between the maximum and average return air temperature changes over a time period with a first temperature threshold and a second temperature threshold to identify indoor units 2 with smaller return air temperature changes caused by larger heat or cooling loads. It then adjusts the opening of the indoor throttle valve 23 to the normal opening multiplied by a larger third correction coefficient to increase refrigerant flow, thereby improving cooling or heating speed and enhancing user comfort and experience. Conversely, by comparing the difference between the maximum and average return air temperature changes over a time period with the first and second temperature thresholds to identify indoor units 2 with larger return air temperature changes caused by smaller heat or cooling loads, it adjusts the opening of the indoor throttle valve 23 to the normal opening multiplied by a smaller first correction coefficient to reduce refrigerant flow, preventing overcooling or overheating. This not only improves user comfort but also reduces power consumption and enhances energy efficiency.

[0051] In some specific embodiments, the indoor return air temperature within each time period is grouped according to the outdoor ambient temperature; that is, the indoor return air temperature change values ​​within the same time period of each day with the same outdoor ambient temperature are grouped together.

[0052] Grouping by outdoor ambient temperature involves setting multiple evenly spaced temperature values, such as 2℃ intervals; then, outdoor ambient temperatures within ±1℃ of the set temperature are considered the same outdoor ambient temperature.

[0053] In some specific embodiments, refer to Figure 1 , Figure 2 , Figure 3 Each time period is a fixed hour after the unit has been turned on for half an hour; for example, 9:00 to 10:00, 10:00 to 11:00, 11:00 to 12:00, etc. That is, after the indoor unit 2 has been turned on for half an hour, it obtains the return air temperature at both ends of multiple time periods with a duration of one hour; that is, the indoor return air temperature at the hour; and then obtains the change value of the indoor return air temperature for each time period.

[0054] If the unit is not at the hour mark after being turned on for half an hour, the indoor return air temperature is immediately obtained, and the change in indoor return air temperature is calculated by comparing it with the indoor return air temperature obtained at the next hour mark.

[0055] In this embodiment, the multi-split air conditioner uses one hour as the length of the time period, which is consistent with the speed at which the air conditioner changes the temperature of the space by cooling and heating, making the difference more obvious and improving the accuracy of control and correction.

[0056] In some specific embodiments, the first correction factor is a positive number less than 1; the second correction factor is 1; and the third correction factor is a number greater than 1.

[0057] In some specific embodiments, the second controller 21 is preset with an indoor throttle valve 23 opening threshold, and is configured such that when adjusting the opening of the indoor throttle valve 23 according to the outdoor ambient temperature and the indoor return air temperature, it must be done within the range of the indoor throttle valve 23 opening threshold, and if it exceeds the threshold, it will operate according to the minimum or maximum value of the exceeded opening.

[0058] In some specific embodiments, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 The indoor unit 2 also includes an indoor fan 24, which is connected to and controlled by the second controller 21, such as turning it on and off and adjusting the fan speed; the second controller 21 is configured as follows: S3. Obtain the outdoor ambient temperature and the number of temperature adjustments within multiple time periods on a daily basis; the specified time period is multiple days, which may be at the beginning of installation, the beginning of the cooling season, the beginning of the heating season, or every time the power is turned on. S4. Obtain the average number of temperature adjustments under the same outdoor ambient temperature over the same time period; that is, group the number of temperature adjustments over the same time period over multiple days if the outdoor ambient temperature is the same, calculate the average value, and obtain the average number of temperature adjustments. S5. Adjust the target value of evaporation temperature and indoor fan speed for the same time period and the same outdoor ambient temperature based on the different average values ​​of the number of temperature adjustments.

[0059] This embodiment of the multi-split air conditioner obtains user habits, temperature sensitivity, and tolerance by statistically analyzing the number of temperature adjustments. Based on this information, it adjusts the target evaporation temperature and indoor fan speed to ensure that the indoor unit 2's temperature control strategy prioritizes either high comfort or energy efficiency. This achieves the goal of meeting user needs or improving energy conservation.

[0060] In some specific embodiments, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 The second controller 21 is also configured as follows: S21. The number of temperature adjustments in each time period is distinguished by the number of times the temperature is raised and lowered according to the outdoor ambient temperature. S22. Obtain the average number of temperature rises and falls for each time period grouped according to outdoor ambient temperature; S23. Adjust the target value of evaporation temperature and indoor fan speed based on the average value of the number of heating cycles and the average value of the number of cooling cycles for the same time period and outdoor ambient temperature.

[0061] This multi-split air conditioner differentiates between heating and cooling, adjusting the target evaporation temperature and indoor fan speed based on the average of the number of heating and cooling cycles. When heating increases significantly, it increases heating power and decreases the indoor fan speed to improve comfort and reduce power consumption. When cooling increases significantly, it increases cooling power while decreasing the indoor fan speed to maintain cooling temperature and improve comfort. When heating decreases frequently, it decreases heating power and increases the indoor fan speed to maintain heating temperature and improve comfort. When cooling decreases frequently, it decreases cooling power and increases the indoor fan speed to increase indoor temperature and maintain comfort.

[0062] In some specific embodiments, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 The specific implementation methods for controlling the target value of evaporation temperature by the average value of the number of heating cycles and the indoor fan baffle are described.

[0063] Specifically, the second controller 21 is preset with a first count threshold and a second count threshold; the first count threshold is higher than the second count threshold; the second controller 21 is also preset with a first correction parameter, a second correction parameter, and a third correction parameter that increase sequentially, which are constants obtained from experiments; the second controller 21 is also preset with a fourth correction coefficient and a fifth correction coefficient, which are constants obtained from experiments.

[0064] The second controller 21 is also configured as follows: S31. Compare the average number of heating cycles with the first temperature threshold and the second temperature threshold; S32. Determine if the average number of heating cycles is higher than the threshold for the first cycle; if yes, proceed to S33; if no, proceed to S34. S33. The indoor fan speed adjustment value for the corresponding outdoor ambient temperature during the time period is β1 + β1 * HPi * K4; the adjustment value for the evaporation temperature target value is β1 * K5; that is, Fi1 = Fi0 + β1 + β1 * HPi * K4; Ts1 = Ts0 + β1 * K5; where β1 is the first correction parameter; K4 is the fourth correction coefficient; HPi is the indoor unit power; K5 is the fifth correction coefficient; Fi1 is the corrected indoor fan speed; Fi0 is the normal indoor fan speed; Ts1 is the corrected evaporation temperature target value; Ts0 is the normal evaporation temperature target value; S34. Determine whether the average number of heating cycles is between the second threshold and the first threshold. If yes, proceed to S35; otherwise, proceed to S36. That is, if the number of heating cycles exceeds the second threshold but is lower than the first threshold, proceed to S35; otherwise, proceed to S36. S35. The indoor fan speed adjustment value for the corresponding outdoor ambient temperature during the time period is β2 + β2 * HPi * K4; the adjustment value for the evaporation temperature target value is β2 * K5; that is, Fi1 = Fi0 + β2 + β2 * HPi * K4; Ts1 = Ts0 + β2 * K5; where β2 is the second correction parameter; K4 is the fourth correction coefficient; HPi is the indoor unit power; K5 is the fifth correction coefficient; Fi1 is the corrected indoor fan speed; Fi0 is the normal indoor fan speed; Ts1 is the corrected evaporation temperature target value; Ts0 is the normal evaporation temperature target value; S36. Determine if the average number of heating cycles is lower than the threshold for the second cycle; if so, proceed to S37. S37. The indoor fan speed adjustment value for the corresponding outdoor ambient temperature during the time period is β3 + β3 * HPi * K4; the adjustment value for the evaporation temperature target value is β3 * K5; that is, Fi1 = Fi0 + β3 + β3 * HPi * K4; Ts1 = Ts0 + β3 * K5; where β3 is the third correction parameter; K4 is the fourth correction coefficient; HPi is the indoor unit 2 power; K5 is the fifth correction coefficient; Fi1 is the corrected indoor fan speed; Fi0 is the normal indoor fan speed; Ts1 is the corrected evaporation temperature target value; Ts0 is the normal evaporation temperature target value.

[0065] The multi-split air conditioner in this embodiment corrects the target value of the evaporation temperature and the indoor fan speed by setting a threshold for the average number of heating cycles and corresponding correction parameters. When the heating temperature rises significantly, the heating power is increased and the indoor fan speed is reduced to improve comfort during heating and reduce power consumption. When the cooling temperature rises significantly, the cooling power is increased while the indoor fan speed is reduced to ensure the cooling temperature and improve comfort.

[0066] In some specific embodiments, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 The specific implementation methods for controlling the target value of evaporation temperature by the average number of cooling cycles and the indoor air deflector are described.

[0067] Specifically, the second controller 21 is preset with a fourth correction parameter, a fifth correction parameter, and a sixth correction parameter that decrease sequentially. These are constants obtained from experiments and are further configured as follows: S41. Compare the average number of cooling cycles with the threshold values ​​for the first and second cooling cycles; S42. Determine whether the average number of cooling cycles is higher than the threshold for the first count; if yes, proceed to S43; if no, proceed to S44; that is, when the average number of cooling cycles reaches or exceeds the threshold for the first count, proceed to S43; when the average number of cooling cycles reaches or falls below the threshold for the first count, proceed to S44. S43. The indoor fan speed adjustment value for the corresponding outdoor ambient temperature during the time period is β4 + β4 * HPi * K4; the adjustment value for the evaporation temperature target value is β4 * K5; that is, Fi1 = Fi0 + β4 + β4 * HPi * K4; Ts1 = Ts0 + β4 * K5; where β4 is the fourth correction parameter; K4 is the fourth correction coefficient; HPi is the indoor unit power; K5 is the fifth correction coefficient; Fi1 is the corrected indoor fan speed; Fi0 is the normal indoor fan speed; Ts1 is the corrected evaporation temperature target value; Ts0 is the normal evaporation temperature target value; S44. Determine whether the average number of cooling cycles is between the second threshold and the first threshold. If yes, execute S45; if no, execute S46. That is, when the cooling cycle threshold reaches or exceeds the second threshold and also reaches or exceeds the first threshold, execute S45; when the cooling cycle threshold reaches or falls below the second threshold, execute S46. S45. The indoor fan speed adjustment value for the corresponding outdoor ambient temperature during the time period is β5 + β5 * HPi * K4; the adjustment value for the evaporation temperature target value is β5 * K5; that is, Fi1 = Fi0 + β5 + β5 * HPi * K4; Ts1 = Ts0 + β5 * K5; where β5 is the fifth correction parameter; K4 is the fourth correction coefficient; HPi is the indoor unit power; K5 is the fifth correction coefficient; Fi1 is the corrected indoor fan speed; Fi0 is the normal indoor fan speed; Ts1 is the corrected evaporation temperature target value; Ts0 is the normal evaporation temperature target value; S46. Determine whether the cooling number threshold is lower than the second number threshold; if so, execute S47; that is, when the cooling number threshold reaches or falls below the second number threshold, execute S47. S47. The indoor fan speed adjustment value for the corresponding outdoor ambient temperature during the time period is β6 + β6 * HPi * K4; the adjustment value for the evaporation temperature target value is β6 * K5; that is, Fi1 = Fi0 + β6 + β6 * HPi * K4; Ts1 = Ts0 + β6 * K5; where β6 is the sixth correction parameter; K4 is the fourth correction coefficient; HPi is the indoor unit power; K5 is the fifth correction coefficient; Fi1 is the corrected indoor fan speed; Fi0 is the normal indoor fan speed; Ts1 is the corrected evaporation temperature target value; Ts0 is the normal evaporation temperature target value.

[0068] In this embodiment, the multi-split air conditioner presets a threshold number of cooling cycles and corresponding correction parameters to adjust the target value of the evaporation temperature and the indoor fan speed. When there are many heating cooling cycles, the heating power is reduced and the indoor fan speed is increased to ensure heating temperature while improving comfort. When there are many cooling cycles, the cooling power is reduced and the indoor fan speed is increased to increase indoor temperature while ensuring comfort.

[0069] In some specific embodiments, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 The outdoor unit 1 also includes a four-way valve 14, which is electrically connected to the first controller 11; the second controller 21 is preset with a seventh correction parameter, an eighth correction parameter, and a ninth correction parameter that decrease sequentially, and is also preset with a third threshold and a fourth threshold that is less than it; the second controller 21 is also preset with a four-way valve state value, and the seventh, eighth, and ninth correction parameters are all constants obtained from experiments; the second controller 21 is also configured as follows: S51. Obtain the number of shutdowns and outdoor ambient temperature over multiple time periods on a daily basis; that is, obtain the number of shutdowns over multiple time periods throughout the day and collect data for multiple days. S52. The number of shutdowns for corresponding time periods over multiple days is grouped according to the outdoor ambient temperature, and the average number of shutdowns is obtained. That is, the corresponding time periods of each day will have different outdoor ambient temperatures. The number of shutdowns for corresponding time periods with the same outdoor environment is grouped into the same group, and the average number of shutdowns in the same group is taken. S53. Compare the average number of shutdowns with the threshold for the third and fourth shutdowns; S54. Determine whether the average number of shutdowns is higher than the third threshold. If yes, proceed to S55; if no, proceed to S56. That is, if the average number of shutdowns reaches or exceeds the third threshold, proceed to S55; if the average number of shutdowns is lower than the third threshold, proceed to S56. S55. The indoor fan speed adjustment value for the corresponding outdoor ambient temperature during the time period is β7 + β7 * HPi * K4; the adjustment value for the evaporation temperature target value is β7 * K5; that is, Fi1 = Fi0 + β7 + β7 * HPi * K4; Ts1 = Ts0 + β7 * K5; where β7 is the product of the seventh correction parameter and the four-way valve status value; during heating, the four-way valve status value is 1; during cooling, the four-way valve status value is -1; K4 is the fourth correction coefficient; HPi is the indoor unit power; K5 is the fifth correction coefficient; Fi1 is the corrected indoor fan speed; Fi0 is the normal indoor fan speed; Ts1 is the corrected evaporation temperature target value; Ts0 is the normal evaporation temperature target value; S56. Determine whether the average number of shutdowns is between the fourth number threshold and the third number threshold; if yes, proceed to S57; if no, proceed to S58; that is, if the shutdown number threshold reaches or exceeds the fourth number threshold and reaches or falls below the third number threshold, proceed to S57; otherwise, proceed to S58. S57. The indoor fan speed adjustment value for the corresponding outdoor ambient temperature during the time period is β8 + β8 * HPi * K4; the adjustment value for the evaporation temperature target value is β8 * K5; that is, Fi1 = Fi0 + β8 + β8 * HPi * K4; Ts1 = Ts0 + β8 * K5; where β8 is the product of the eighth correction parameter and the four-way valve status value; during heating, the four-way valve status value is 1; during cooling, the four-way valve status value is -1; K4 is the fourth correction coefficient; HPi is the indoor unit power; K5 is the fifth correction coefficient; Fi1 is the corrected indoor fan speed; Fi0 is the normal indoor fan speed; Ts1 is the corrected evaporation temperature target value; Ts0 is the normal evaporation temperature target value; S58. Determine whether the shutdown count threshold is lower than the fourth count threshold; if so, execute S59; that is, if the shutdown count threshold is at or below the fourth count threshold, execute S59. S59, the indoor fan speed adjustment value for the corresponding outdoor ambient temperature during the time period is β9 + β9 * HPi * K4; the adjustment value for the evaporation temperature target value is β9 * K5; that is, Fi1 = Fi0 + β9 + β9 * HPi * K4; Ts1 = Ts0 + β9 * K5; where β9 is the product of the ninth correction parameter and the four-way valve status value; when heating, the four-way valve status value is 1; when cooling, the four-way valve status value is -1; K4 is the fourth correction coefficient; HPi is the indoor unit power; K5 is the fifth correction coefficient; Fi1 is the corrected indoor fan speed; Fi0 is the normal indoor fan speed; Ts1 is the corrected evaporation temperature target value; Ts0 is the normal evaporation temperature target value.

[0070] This embodiment of the multi-split air conditioner adjusts the target evaporation temperature and indoor fan speed based on a preset threshold for the average number of shutdowns and corresponding correction parameters. When the number of shutdowns during heating is high, the heating power is reduced and the indoor fan speed is increased to maintain heating temperature while improving comfort. Conversely, when the number of shutdowns during cooling is high, the cooling power is increased and the indoor fan speed is decreased to maintain cooling temperature while improving comfort. In other words, as the number of shutdowns during heating increases, the heating power is significantly reduced and the indoor fan speed is increased to maintain heating temperature while improving airflow and thus comfort. Similarly, as the number of shutdowns during cooling increases, the cooling power is significantly increased and the indoor fan speed is decreased to maintain cooling temperature while increasing direct, high-volume cooling airflow and thus improving comfort.

[0071] In some specific embodiments, the second controller 21 is preset with an indoor air damper threshold and an evaporation temperature target threshold, and the adjustment of the indoor air damper is within the range of the indoor air damper threshold, and the adjustment of the evaporation temperature target value is within the range of the evaporation temperature target threshold.

[0072] In some specific embodiments, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 The first, second, and third correction parameters are opposites of the fourth, fifth, and sixth correction parameters, respectively; that is, the first correction parameter is positive and opposite to the fourth correction parameter; the fourth correction parameter is negative; the second correction parameter is positive and opposite to the fifth correction parameter; the fifth correction parameter is negative; the third correction parameter is positive or zero and opposite to the sixth correction parameter; the sixth correction parameter is negative or zero.

[0073] In some specific embodiments, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 The seventh, eighth, and ninth correction parameters are equal to the fourth, fifth, and sixth correction parameters, respectively; that is, the seventh correction parameter is equal to the fourth correction parameter; the eighth correction parameter is equal to the fifth correction parameter; and the ninth correction parameter is equal to the sixth correction parameter. In some specific embodiments, the threshold for the third count is equal to or less than the threshold for the first count; the threshold for the fourth count is less than the threshold for the second count.

[0074] In this embodiment, the multi-split air conditioner has a greater impact on the stability and power consumption of the air conditioning system when it is turned off. Therefore, the values ​​of the third and fourth thresholds are adjusted to allow for greater adjustment of the evaporation temperature target value and indoor fan speed when the unit is turned off, thereby improving user comfort and reducing power consumption.

[0075] In some specific embodiments, refer to Figure 1 , Figure 2 , Figure 3 , Figure 9 , Figure 10 The outdoor unit 1 also includes a compressor 14, which is a variable frequency compressor 14, connected to the first controller 11 and controlled by the first controller 11.

[0076] The first controller 11 is preset with three levels of electricity price that increase sequentially: Level 1, Level 2, and Level 3; that is, Level 3 has the highest electricity price, Level 2 has the next highest, and Level 1 has the lowest. The first controller 11 is also preset with a sixth, seventh, eighth, and ninth correction coefficient, all of which are constants obtained experimentally. The first controller 11 is further configured as follows: S61. Obtain the electricity price level for the current time period; S62. Determine whether the electricity price for the current time period is at the first level; if yes, execute S63; if no, execute S64; that is, if the electricity price for the current time period is at the first level, execute S63; if the electricity price for the current time period is not at the first level, execute S64. S63. Control the operating frequency of compressor 14 during the current time period to increase by HP*K6; when controlling compressor 14 to increase or decrease frequency, multiply the rate of increase and decrease by HP*K7; and increase the target superheat by K8; that is, H1=H0+ HP*K6; △H1=△H0*HP*K7; Tsh1=Tsh0+ K8; K6 is the sixth correction coefficient; K7 is the seventh correction coefficient; K8 is the eighth correction coefficient; H1 is the corrected operating frequency of compressor 14; H0 is the uncorrected operating frequency of compressor 14; △H1 is the corrected rate of increase or decrease of frequency of compressor 14; △H0 is the uncorrected rate of increase or decrease of frequency of compressor 14; Tsh1 is the corrected target superheat value; Tsh0 is the uncorrected target superheat value. S64. Determine whether the electricity price for the current time period is at the second level; if yes, execute S65; if no, execute S66; that is, if the electricity price for the current time period is at the second level, execute S65; if the electricity price for the current time period is neither at the first nor the second level, execute S66. S65. The operating frequency of the compressor 14 is not adjusted; the rate of frequency increase and decrease of the compressor 14 is not adjusted; the target superheat value is not adjusted. S66. Determine whether the electricity price for the current time period is at the third level; if so, proceed to S67. S67. Control the operating frequency of compressor 14 during the current time period to decrease by HP*K6; when controlling compressor 14 to increase or decrease frequency, the rate of increase and decrease frequency is multiplied by HP*K9; and the target superheat is reduced by K8; that is, H1=H0-HP*K6; △H1=△H0*HP*K9; Tsh1=Tsh0-K8; K6 is the sixth correction coefficient; K7 is the seventh correction coefficient; K8 is the eighth correction coefficient; K9 is the ninth correction coefficient; H1 is the corrected operating frequency of compressor 14; H0 is the uncorrected operating frequency of compressor 14; △H1 is the corrected rate of increase or decrease frequency of compressor 14; △H0 is the uncorrected rate of increase or decrease frequency of compressor 14; Tsh1 is the corrected target superheat value; Tsh0 is the uncorrected target superheat value.

[0077] This embodiment of the multi-split air conditioner divides the electricity price into three levels: the first level is the capacity priority level, which prioritizes meeting capacity needs; the second level is the middle value of the electricity price, which is set as the equilibrium level, and the values ​​of operating frequency, frequency increase and decrease rate, and target superheat are not adjusted; the third level is the high electricity price level, which is set as the energy-saving priority level, and the operating frequency of the compressor 14 is adjusted by decreasing the frequency, and the frequency increase and decrease rate are adjusted respectively to reduce the target superheat, thereby reducing the operating power and achieving the purpose of energy saving.

[0078] In some specific embodiments, the first controller 11 is preset with an operating frequency threshold, a frequency ramp-up and frequency ramp-down rate, and an overheat threshold, and is configured to adjust the operating frequency, frequency ramp-up and frequency ramp-down rate, and overheat threshold so that they are all within the range of the operating frequency threshold, the frequency ramp-up and frequency ramp-down rate threshold, and the overheat threshold.

[0079] In some specific embodiments, when the indoor unit 2 has a high heat load or cooling load and a high electricity price, the indoor throttle valve 23 is adjusted to increase the opening degree and the compressor 14 is controlled to reduce a certain frequency, so that the compressor 14 operates more efficiently and consumes less energy.

[0080] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0081] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A multi-split air conditioner, characterized in that, include: The outdoor unit includes a first controller and a first temperature detection unit connected thereto; The first temperature detection unit is used to detect the outdoor ambient temperature and transmit it to the first controller; Multiple indoor units, including a second controller and a second temperature detection unit connected thereto, and an indoor throttling valve; The second temperature detection unit is used to detect the indoor return air temperature and transmit it to the second controller; each of the second controllers is communicatively connected to the first controller, and acquires the outdoor ambient temperature and the indoor return air temperature for multiple time periods on a daily basis, and corrects the opening degree of the indoor throttling valve for the same time period and the outdoor ambient temperature according to the change value of the indoor return air temperature in each time period.

2. The multi-split air conditioner according to claim 1, characterized in that, The second controller is preset with a first temperature threshold, a second temperature threshold below which it is lower, a first correction coefficient, a second correction coefficient, and a third correction coefficient that increase sequentially; and is configured as follows: The return air temperature change values ​​for the same time period on each day are grouped according to the outdoor ambient temperature, and the maximum value of the return air temperature change value in each group is obtained. Obtain the return air temperature change value of each indoor unit in each time period, group them according to the time period and the outdoor ambient temperature, and obtain the average value of each group; Compare the maximum value with the average value under the corresponding time period and outdoor ambient temperature; determine the difference between the maximum value and the average value; If it is higher than the first temperature threshold, the opening degree of the indoor throttle valve during the same time period and at the same outdoor ambient temperature is multiplied by the first correction factor; If it is between the second temperature threshold and the first temperature threshold, the opening of the indoor throttle valve during the same time period and at the same outdoor ambient temperature is multiplied by the second correction factor. If it is below the second temperature threshold, the opening degree of the indoor throttle valve during the same time period and at the same outdoor ambient temperature is multiplied by the third correction factor.

3. The multi-split air conditioner according to claim 2, characterized in that, The time period refers to a whole hour starting half an hour after the device is powered on; The first correction factor is a positive number less than 1; the second correction factor is 1; and the third correction factor is a number greater than 1.

4. The multi-split air conditioner according to any one of claims 1 to 3, characterized in that, The second controller acquires the outdoor ambient temperature and the number of temperature adjustments over multiple time periods on a daily basis, and adjusts the target value of the evaporation temperature and the indoor fan speed for the same time period and the same outdoor ambient temperature based on the average number of temperature adjustments over the same time period.

5. The multi-split air conditioner according to claim 4, characterized in that, The second controller is configured as follows: The number of temperature adjustments within each time period is divided into the number of temperature increases and the number of temperature decreases. The number of times the temperature rises and the number of times the temperature falls within each time period are grouped according to the outdoor ambient temperature, and the average number of times the temperature rises and the average number of times the temperature falls in each group are obtained. Adjust the target value of the evaporation temperature and the indoor fan speed according to the same time period and the outdoor ambient temperature, based on the average number of heating times and the average number of cooling times.

6. The multi-split air conditioner according to claim 5, characterized in that, The second controller is preset with a first number threshold and a second number threshold less than it, a first correction parameter, a second correction parameter, and a third correction parameter that increase sequentially, and also presets a fourth correction coefficient and a fifth correction coefficient; The second controller is configured as follows: Compare the average number of heating cycles with the first number threshold and the second number threshold; If the average number of heating cycles is higher than the first threshold value, the indoor fan speed adjustment value is β1 + β1 * HPi * K4; the adjustment value of the target evaporation temperature is β1 * K5. If the average number of heating cycles is between the second number threshold and the first number threshold, the indoor fan speed adjustment value is β2 + β2 * HPi * K4; the adjustment value of the target evaporation temperature is β2 * K5. If the average number of heating cycles is lower than the second threshold value, the indoor fan speed adjustment value is β3 + β3 * HPi * K4; the adjustment value of the evaporation temperature target value is β3 * K5. β1, β2, and β3 are the first correction parameter, the second correction parameter, and the third correction parameter, respectively. HPi represents the indoor unit power; K4 and K5 are the fourth and fifth correction coefficients, respectively.

7. The multi-split air conditioner according to claim 6, characterized in that, The second controller is preset with a fourth correction parameter, a fifth correction parameter, and a sixth correction parameter that decrease sequentially, and is configured as follows: Compare the average number of cooling cycles with the first number threshold and the second number threshold; If the average number of cooling cycles is higher than the first threshold value, the indoor fan speed adjustment value is β4 + β4 * HPi * K4; the adjustment value of the evaporation temperature target value is β4 * K5. If the average number of cooling cycles is between the second number threshold and the first number threshold, the indoor fan speed adjustment value is β5 + β5 * HPi * K4; the adjustment value of the evaporation temperature target value is β5 * K5. If the average number of cooling cycles is lower than the second threshold value, the indoor fan speed adjustment value is β6 + β6 * HPi * K4; the adjustment value of the evaporation temperature target value is β6 * K5. β4, β5, and β6 are the fourth, fifth, and sixth correction parameters, respectively.

8. The multi-split air conditioner according to claim 7, characterized in that, The second controller is preset with a seventh correction parameter, an eighth correction parameter, and a ninth correction parameter that decrease sequentially. It also has preset four-way valve status values, a third threshold value, and a fourth threshold value less than these. Furthermore, it is configured as follows: The number of shutdowns and the outdoor ambient temperature are obtained in multiple time periods on a daily basis; the number of shutdowns in each time period is grouped according to the outdoor ambient temperature, and the average number of shutdowns in each group is obtained. Compare the average number of shutdowns with the third threshold and the fourth threshold; If the average number of shutdowns is higher than the threshold value for the third shutdown, the indoor fan speed adjustment value is β7 + β7 * HPi * K4; the adjustment value for the target evaporation temperature is β7 * K5. If the average number of shutdowns is between the fourth threshold and the third threshold, the indoor fan speed adjustment value is β8 + β8 * HPi * K4; the adjustment value of the evaporation temperature target value is β8 * K5. If the average number of shutdowns is lower than the fourth threshold, the indoor fan speed adjustment value is β9 + β9 * HPi * K4; the evaporation temperature target value is adjusted to β9 * K5. β7, β8, and β9 are the products of the seventh correction parameter and the four-way valve state value, the eighth correction parameter and the four-way valve state value, and the ninth correction parameter and the four-way valve state value, respectively; during cooling, the four-way valve state value is -1; during heating, the four-way valve state value is 1.

9. The multi-split air conditioner according to claim 8, characterized in that, The first correction parameter, the second correction parameter, and the third correction parameter are the opposites of the fourth correction parameter, the fifth correction parameter, and the sixth correction parameter, respectively. The seventh correction parameter, the eighth correction parameter, and the ninth correction parameter are respectively equal to the fourth correction parameter, the fifth correction parameter, and the sixth correction parameter; The third number threshold is equal to the first number threshold; the fourth number threshold is less than the second number threshold.

10. The multi-split air conditioner according to any one of claims 1 to 3, characterized in that, The outdoor unit also includes a compressor, which is connected to and controlled by the first controller; The first controller is pre-set with three levels of electricity price that increase sequentially: a first level, a second level, and a third level. It is also pre-set with a sixth, a seventh, an eighth, and a ninth correction coefficient, configured as follows: Determine the electricity price level for the current time; If the electricity price is at the first level, the operating frequency of the compressor is increased by HP*K6, the rate of increase and decrease of the operating frequency is multiplied by HP*K7, and the target superheat is increased by K8. If the electricity price is at the second level, the operating frequency of the compressor will not be adjusted, the rate of increase and decrease of the operating frequency will not be adjusted, and the target superheat will not be adjusted. If the electricity price is at the third level, the operating frequency of the compressor is reduced by HP*K6, the rate of increase and decrease of the operating frequency is multiplied by HP*K9, and the target superheat is reduced by K8. Wherein, K6, K7, K8, and K9 are the sixth correction coefficient, the seventh correction coefficient, the eighth correction coefficient, and the ninth correction coefficient, respectively; HP represents the outdoor unit's power.

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