Multi-connected air conditioner, its control method, and computer-readable storage medium

Abstract

The present invention discloses a control method for a multi-connected air conditioner. The method includes: when the multi-connected air conditioner is operating in a cooling mode, if an indoor unit in at least two indoor units activates a preset air feeling mode, controlling the operation of the compressor according to a first evaporation parameter; the air outlet speed of the indoor unit corresponding to the preset air feeling mode is less than a preset speed; when the multi-connected air conditioner operates to reach a first preset condition, controlling the operation of the compressor according to a second evaporation parameter; wherein both the first evaporation parameter and the second evaporation parameter are characterization parameters of the target evaporation state required by the indoor heat exchanger in the indoor unit, and the temperature of the indoor heat exchanger corresponding to the second evaporation parameter is greater than the temperature of the indoor heat exchanger corresponding to the first evaporation parameter. The present invention also discloses a multi-connected air conditioner and a computer-readable storage medium. The present invention aims to effectively balance anti-condensation and cooling effect when the multi-connected air conditioner turns on the no-air-feeling function.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and particularly to a control method for a multi-connected air conditioner, a multi-connected air conditioner, and a computer-readable storage medium. Background Art

[0002] Generally, a multi-connected air conditioner has more than one indoor unit connected to an outdoor unit. With the development of economy and technology, multi-connected air conditioners are more and more widely used, and users' performance requirements for multi-connected air conditioners are also constantly improving.

[0003] Currently, when the indoor unit of a multi-connected air conditioner turns on the windless feeling function, the outdoor unit generally directly switches to a fixed low frequency operation to prevent condensation on the indoor unit. However, this is likely to affect the refrigeration effect of the indoor unit, especially the refrigeration effect of the indoor unit without the windless feeling function turned on. Thus, it can be seen that there is currently no effective balance between anti-condensation and refrigeration effect in the regulation process after the windless feeling function of a multi-connected air conditioner is turned on. Summary of the Invention

[0004] The main purpose of the present invention is to provide a control method for a multi-connected air conditioner, a multi-connected air conditioner, and a computer-readable storage medium, aiming to effectively balance anti-condensation and refrigeration effect when the multi-connected air conditioner turns on the windless feeling function.

[0005] To achieve the above purpose, the present invention provides a control method for a multi-connected air conditioner. The multi-connected air conditioner includes a compressor and at least two indoor units. The compressor is connected to each indoor unit. The control method for the multi-connected air conditioner includes the following steps:

[0006] When the multi-connected air conditioner is in refrigeration operation, if an indoor unit among the at least two indoor units starts a preset wind feeling mode, the compressor is controlled to operate according to a first evaporation parameter; the air outlet wind speed of the indoor unit corresponding to the preset wind feeling mode is less than a preset wind speed;

[0007] When the multi-connected air conditioner operates to reach a first preset condition, the compressor is controlled to operate according to a second evaporation parameter;

[0008] Wherein, both the first evaporation parameter and the second evaporation parameter are characterization parameters of the target evaporation state that the indoor heat exchanger in the indoor unit needs to reach, and the temperature of the indoor heat exchanger corresponding to the second evaporation parameter is greater than the temperature of the indoor heat exchanger corresponding to the first evaporation parameter.

[0009] Optionally, before the step of controlling the compressor to operate according to the second evaporation parameter, it further includes:

[0010] When the multi-connected air conditioner operates to reach a first preset condition, obtain the first environmental humidity of the space where the indoor unit that turns on the preset wind feeling mode is located;

[0011] Determine the second evaporation parameter according to the first ambient humidity.

[0012] Optionally, the step of obtaining the first ambient humidity of the space where the indoor unit with the preset air feeling mode turned on is located includes:

[0013] If the number of target indoor units is more than one, obtain the sub-ambient humidity of the space where each indoor unit with the preset air feeling mode turned on is located;

[0014] Determine the first ambient humidity according to more than one sub-ambient humidity.

[0015] Optionally, the step of determining the first ambient humidity according to more than one sub-ambient humidity includes:

[0016] Among more than one sub-ambient humidity, determine the sub-ambient humidity with the largest value as the first ambient humidity.

[0017] Optionally, after the step of controlling the operation of the compressor according to the first evaporation parameter, the following is further included:

[0018] Obtain the number of target indoor units and the continuous operation duration of the compressor after the preset air feeling mode is started; the target indoor unit is the indoor unit with the preset air feeling mode turned on among the at least two indoor units;

[0019] When the number of target indoor units is greater than or equal to the target number and the continuous operation duration is greater than or equal to the preset duration, determine that the multi-connected air conditioner operation reaches the first preset condition;

[0020] When the number of target indoor units is less than the target number, or when the continuous operation duration is less than the preset duration, return to execute the step of controlling the operation of the compressor according to the first evaporation parameter.

[0021] Optionally, before the step of determining that the multi-connected air conditioner operation reaches the preset condition when the number of target indoor units is greater than or equal to the target number and the continuous operation duration is greater than or equal to the preset duration, the following is further included:

[0022] Obtain the total number of currently turned-on indoor units among the at least two indoor units as the target number.

[0023] Optionally, the first evaporation parameter includes a first evaporation temperature, the second evaporation parameter includes a second evaporation temperature, and the first evaporation temperature is less than the second evaporation temperature;

[0024] Alternatively, the first evaporation parameter includes a first evaporation pressure, the second evaporation parameter includes a second evaporation pressure, and the first evaporation pressure is less than the second evaporation pressure.

[0025] Optionally, during the execution of the step of controlling the operation of the compressor according to the first evaporation parameter, the method further includes:

[0026] Controlling the opening degree of the target electronic expansion valve according to a preset superheat degree;

[0027] Wherein, the target indoor unit is defined as the indoor unit that turns on the preset air feeling mode among the at least two indoor units, and the target electronic expansion valve is the electronic expansion valve in the target indoor unit.

[0028] Optionally, after the step of controlling the operation of the compressor according to the second evaporation parameter, the method further includes:

[0029] When the multi-connected air conditioner operates to reach a second preset condition, controlling the opening degree of the target electronic expansion valve according to the target superheat degree;

[0030] Wherein, the target superheat degree is determined according to the second ambient humidity of the space where the target indoor unit is located, and the target superheat degree is greater than or equal to the preset superheat degree.

[0031] Optionally, the second preset condition includes at least one of the following:

[0032] The continuous duration for which the target indoor unit turns on the preset air feeling mode is greater than a set duration;

[0033] The current evaporation temperature of the target indoor unit is less than the target evaporation temperature, or the current evaporation pressure of the target indoor unit is less than the target evaporation pressure; the target evaporation temperature or the target evaporation pressure is determined according to the second ambient humidity;

[0034] The exhaust temperature of the compressor is less than a preset exhaust temperature;

[0035] The exhaust superheat degree of the compressor is less than a preset exhaust superheat degree.

[0036] Optionally, after the step of controlling the opening degree of the target electronic expansion valve according to the target superheat degree, the method further includes:

[0037] When the multi-connected air conditioner operates to reach a third preset condition, returning to execute the step of controlling the opening degree of the target electronic expansion valve according to the preset superheat degree;

[0038] The third preset condition includes at least one of the following:

[0039] The target indoor unit exits the preset air feeling mode;

[0040] The exhaust temperature of the compressor is greater than or equal to a preset exhaust temperature;

[0041] The superheat degree of the exhaust of the compressor is greater than or equal to a preset superheat degree of the exhaust.

[0042] In addition, to achieve the above object, the present application also provides a multi-connected air conditioner, which includes:

[0043] At least two indoor units;

[0044] A compressor, which is connected to each of the indoor units;

[0045] A control device, both the indoor unit and the compressor are connected to the control device, and the control device includes: a memory, a processor, and a control program of the multi-connected air conditioner stored on the memory and operable on the processor. When the control program of the multi-connected air conditioner is executed by the processor, the steps of the control method of the multi-connected air conditioner described in any one of the above are implemented.

[0046] In addition, to achieve the above object, the present application also provides a computer-readable storage medium, on which a control program of the multi-connected air conditioner is stored. When the control program of the multi-connected air conditioner is executed by a processor, the steps of the control method of the multi-connected air conditioner described in any one of the above are implemented.

[0047] A control method for a multi-connected air conditioner proposed by the present invention is based on a multi-connected air conditioner including a compressor and at least two indoor units connected to the compressor. When the multi-connected air conditioner operates in a refrigeration mode and there is a preset air feeling mode in which an indoor unit needs to be turned on at a low wind speed, the compressor does not directly switch to a fixed low frequency operation. Instead, the compressor operation is first controlled by a first evaporation parameter so that the indoor heat exchanger of the indoor unit can have a lower temperature to achieve a rapid temperature drop, thereby ensuring the refrigeration effect indoors. On this basis, when the multi-connected air conditioner operates to reach a first preset condition, the compressor operation is further controlled by a second evaporation parameter so that the indoor heat exchanger of the indoor unit can have a higher temperature to avoid too low an air outlet temperature to prevent condensation from occurring in the indoor unit operating in the preset air feeling mode, thereby achieving an effective balance between anti-condensation and refrigeration effect when the multi-connected air conditioner turns on the no-air-feeling function. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is a schematic diagram of the hardware structure involved in the operation of an embodiment of the multi-connected air conditioner of the present invention;

[0049] Figure 2 It is a schematic flowchart of an embodiment of the control method of the multi-connected air conditioner of the present invention;

[0050] Figure 3A flow chart of another embodiment of a control method for a multi-split air conditioner according to the present invention;

[0051] Figure 4 A flow chart of another embodiment of a control method for a multi-split air conditioner according to the present invention;

[0052] Figure 5 The present invention is a flowchart of another embodiment of a method for controlling a multi-split air conditioner.

[0053] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0054] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0055] The main solution of the embodiment of the present invention is: based on a multi-split air conditioner provided with a compressor and at least two indoor units connected to the compressor, when the multi-split air conditioner is in cooling operation, if the indoor unit of the at least two indoor units starts a preset wind sensing mode, the operation of the compressor is controlled according to a first evaporation parameter; the air outlet wind speed of the target indoor unit in the preset wind sensing mode is less than the preset wind speed; when the operation of the multi-split air conditioner reaches a first preset condition, the operation of the compressor is controlled according to a second evaporation parameter; wherein the first evaporation parameter and the second evaporation parameter are both characterizing parameters of the target evaporation state that the indoor heat exchanger in the indoor unit needs to achieve, and the indoor heat exchanger temperature corresponding to the second evaporation parameter is greater than the indoor heat exchanger temperature corresponding to the first evaporation parameter.

[0056] In the prior art, when the indoor unit of a multi-split air conditioner turns on the windless function, the outdoor unit generally switches directly to low-frequency operation to prevent condensation in the indoor unit. However, this easily affects the cooling effect of the indoor unit, especially the cooling effect of the indoor unit that does not have the windless function turned on. It can be seen that the current multi-split air conditioner cannot effectively balance the anti-condensation and cooling effects during the control process after the windless function is turned on.

[0057] The present invention provides the above-mentioned solution, aiming to achieve an effective balance between anti-condensation and cooling effect when the windless function of the multi-split air conditioner is turned on.

[0058] The embodiment of the present invention provides a multi-split air conditioner.

[0059] Specifically, in this embodiment, refer to Figure 1, the multi-connected air conditioner includes a compressor 1, at least two indoor units 2 and a control device. The compressor 1 is connected to each of the indoor units 2, and both the compressor 1 and each of the indoor units 2 are connected to the control device. At least two indoor units 2 are arranged in parallel. In this embodiment, the number of indoor units 2 is 3. In other embodiments, the number of indoor units 2 can also be set to more or fewer according to actual needs, such as 2, 4, 5, etc. Different indoor units 2 are respectively arranged in different space areas.

[0060] Among them, each indoor unit 2 respectively includes an indoor heat exchanger and an electronic expansion valve connected in series with the indoor heat exchanger. The electronic expansion valve can be used to adjust the refrigerant flow rate of the indoor heat exchanger connected in series. Specifically, since the indoor units 2 are arranged in parallel, when the electronic expansion valve adjusts the refrigerant flow rate of the indoor heat exchanger connected in series with it, it will simultaneously affect the refrigerant flow rates of other indoor heat exchangers connected in parallel with it. For example, when the electronic expansion valve reduces the opening to reduce the flow rate of the indoor heat exchanger connected in series with it, the refrigerant flow rates of other indoor heat exchangers connected in parallel with this indoor heat exchanger will increase when the opening degrees of the electronic expansion valves of other indoor units 2 remain unchanged.

[0061] Specifically, each indoor unit 2 may further include an indoor fan corresponding to the indoor heat exchanger. When the indoor fan is turned on, it can drive the air in the space where the indoor unit 2 is located into the indoor unit 2 and pass through the corresponding indoor heat exchanger for heat exchange, and the heat-exchanged air is sent into the space where the indoor unit 2 is located.

[0062] Furthermore, at least one humidity sensor 3 can be correspondingly arranged for each indoor unit 2 to detect the indoor environmental humidity of the space where each indoor unit 2 is located. The humidity sensor 3 can be connected to the control device, and the control device can obtain the humidity data detected by the humidity sensor 3.

[0063] Furthermore, the multi-connected air conditioner may also be provided with a first temperature sensor 4 to detect the exhaust temperature of the compressor 1. Specifically, the first temperature sensor 4 can be arranged at the exhaust port of the compressor 1. The first temperature sensor 4 can be connected to the control device, and the control device can obtain the temperature data detected by the first temperature sensor 4.

[0064] Furthermore, the multi-connected air conditioner may also be provided with more than one second temperature sensor 5 to detect the evaporation temperature of the indoor heat exchanger. Specifically, at least one second temperature sensor 5 is arranged in each indoor unit 2. The second temperature sensor 5 can be arranged in the middle of the coil of the indoor heat exchanger. The second temperature sensor 5 can be connected to the control device, and the control device can obtain the temperature data detected by the second temperature sensor 5.

[0065] Furthermore, in the embodiment of the present invention, refer to Figure 1, the control device of the multi-connected air conditioner includes: a processor 1001 (such as a CPU), a memory 1002, etc. The processor 1001 and the memory 1002 are connected through a communication bus. The memory 1002 can be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. Optionally, the memory 1002 can also be a storage device independent of the aforementioned processor 1001.

[0066] Those skilled in the art can understand that Figure 1 the device structure shown in

[0067] does not constitute a limitation on the device, and may include more or fewer components than shown in the figure, or combine certain components, or have different component arrangements. Figure 1 As shown in Figure 1 , the memory 1002, as a computer-readable storage medium, may include a control program for the multi-connected air conditioner. In the

[0068] Embodiment of the present invention also provides a control method for a multi-connected air conditioner, which is applied to control the above multi-connected air conditioner.

[0069] Referring to Figure 2 , an embodiment of the control method for the multi-connected air conditioner of the present application is proposed. In this embodiment, the control method for the multi-connected air conditioner includes:

[0070] Step S10, when the multi-connected air conditioner is in cooling operation, if the indoor unit in at least two indoor units starts a preset air feeling mode, the compressor is controlled to operate according to the first evaporation parameter; the air outlet wind speed of the indoor unit corresponding to the preset air feeling mode is less than the preset wind speed;

[0071] During the cooling operation of the multi-connected air conditioner, at least one indoor unit among all indoor units of the multi-connected air conditioner is turned on and operates in cooling. Specifically, some indoor units may operate in cooling while the other part is turned off, or all indoor units may operate in cooling, and the specific operation can be based on the actual cooling demand of the space where the indoor unit is located.

[0072] The preset wind speed can be a parameter configured by the system by default or a parameter set by the user. If the air outlet wind speed is less than the preset wind speed, it indicates that the air outlet wind speed of the target indoor unit is relatively low. In the preset wind feeling mode, the target indoor unit requires low-speed air supply to meet the comfort of users in the space where it is located. The preset wind feeling mode can be enabled by the user inputting a control command, or it can be started when the indoor unit monitors that the scene parameters in the space where it is located reach the preset state. In this embodiment, the preset wind feeling mode is the no-wind feeling mode.

[0073] If some or all of the indoor units in at least one indoor unit operating in the cooling mode start the preset wind feeling mode, the operation of the compressor can be controlled according to the first evaporation parameter.

[0074] The first evaporation parameter here can be a fixed parameter set in advance (the corresponding compressor operating frequency is greater than the set frequency value, that is, the compressor operating frequency corresponding to the first evaporation parameter is medium to high frequency), or it can be a characteristic parameter of the target evaporation state of the indoor heat exchanger when any indoor unit starts the preset wind feeling mode (that is, when changing from the state where there is no indoor unit with the preset wind feeling mode enabled to the state where there is an indoor unit with the preset wind feeling mode enabled), or it can also be a parameter determined according to the current operating conditions of the multi-connected air conditioner.

[0075] The first evaporation parameter can be any parameter characterizing the target evaporation state that the target heat exchanger needs to reach. In this embodiment, the first evaporation parameter includes at least one target value of the evaporation temperature and evaporation pressure of the indoor heat exchanger. The temperature of the indoor heat exchanger corresponding to the first evaporation parameter is less than the set temperature threshold.

[0076] Controlling the operation of the compressor according to the first evaporation parameter specifically means adjusting the operating frequency of the compressor so that the actual evaporation state of the indoor heat exchanger in some or all of the indoor units or the indoor units with the preset wind feeling mode enabled can reach the target evaporation state corresponding to the first evaporation parameter.

[0077] Specifically, different first evaporation parameters correspond to different compressor operating frequencies. The smaller the temperature of the indoor heat exchanger corresponding to the first evaporation parameter, the higher the compressor operating frequency.

[0078] In this embodiment, the first evaporation parameter is a fixed parameter set in advance. When at least one indoor unit enables the preset wind feeling mode, regardless of the number of indoor units with the preset wind feeling mode enabled, in the initial stage of enabling the preset wind feeling mode, the operation of the compressor is controlled according to the preset first evaporation parameter.

[0079] Step S20, when the multi-connected air conditioner operates to reach a first preset condition, control the operation of the compressor according to a second evaporation parameter; wherein, both the first evaporation parameter and the second evaporation parameter are characterization parameters of the target evaporation state required to be achieved by the indoor heat exchanger in the indoor unit, and the temperature of the indoor heat exchanger corresponding to the second evaporation parameter is greater than the temperature of the indoor heat exchanger corresponding to the first evaporation parameter.

[0080] The first preset condition is specifically the condition that the operation parameters of the multi-connected air conditioner or the environmental parameters of its environment need to reach when it is characterized that there is no condensation risk in the multi-connected air conditioner or the cooling demand of the target indoor unit is basically met. The first preset condition can be set according to actual needs.

[0081] The second evaporation parameter here can be a pre-set fixed parameter (the compressor operation frequency corresponding to it is greater than the set frequency value, that is, the compressor operation frequency corresponding to the second evaporation parameter is medium and low frequency), or it can be a parameter determined according to the current operation state of the multi-connected air conditioner or the environmental parameters (such as temperature and / or humidity, etc.) of the environment where the indoor unit with the preset air feeling mode is located.

[0082] The second evaporation parameter can be any parameter characterizing the target evaporation state required to be achieved by the target heat exchanger. In this embodiment, the second evaporation parameter includes at least one target value of the evaporation temperature and evaporation pressure of the indoor heat exchanger. The temperature of the indoor heat exchanger corresponding to the second evaporation parameter is greater than the set temperature threshold.

[0083] Controlling the operation of the compressor according to the second evaporation parameter specifically means adjusting the operation frequency of the compressor so that the actual evaporation state of the indoor heat exchanger in some indoor units or all indoor units or the indoor units with the preset air feeling mode can reach the target evaporation state corresponding to the second evaporation parameter.

[0084] Specifically, different second evaporation parameters correspond to different compressor operation frequencies. The greater the temperature of the indoor heat exchanger corresponding to the second evaporation parameter, the lower the compressor operation frequency.

[0085] The compressor frequency corresponding to the second evaporation parameter is less than or equal to the compressor frequency corresponding to the first evaporation parameter.

[0086] Further, in this embodiment, the first evaporation parameter includes a first evaporation temperature, the second evaporation parameter includes a second evaporation temperature, and the first evaporation temperature is less than the second evaporation temperature. Or, the first evaporation parameter includes a first evaporation pressure, the second evaporation parameter includes a second evaporation pressure, and the first evaporation pressure is less than the second evaporation pressure.

[0087] A control method for a multi-connected air conditioner proposed in an embodiment of the present invention is based on a multi-connected air conditioner including a compressor and at least two indoor units connected to the compressor. When the multi-connected air conditioner is operating in the cooling mode and there is a preset air feeling mode in which the indoor unit needs to be turned on at a low wind speed, the compressor does not directly switch to a fixed low frequency operation. Instead, the compressor operation is first controlled by a first evaporation parameter so that the indoor heat exchanger of the indoor unit can have a lower temperature to achieve a rapid temperature drop, thereby ensuring the cooling effect indoors. On this basis, when the multi-connected air conditioner operates to reach a first preset condition, the compressor operation is further controlled by a second evaporation parameter so that the indoor heat exchanger of the indoor unit can have a higher temperature to avoid too low an air outlet temperature and prevent condensation from occurring in the indoor unit operating in the preset air feeling mode, thereby achieving an effective balance between anti-condensation and cooling effect when the multi-connected air conditioner turns on the no-air-feeling function.

[0088] Further, based on the above embodiment, another embodiment of the control method for the multi-connected air conditioner of the present application is proposed. In this embodiment, the step of controlling the operation of the compressor according to the second evaporation parameter is defined as step S20a. Referring to Figure 3 , before step S20a, it further includes:

[0089] Step S201, when the multi-connected air conditioner operates to reach a first preset condition, obtain the first ambient humidity of the space where the indoor unit turning on the preset air feeling mode is located;

[0090] Define the indoor unit that turns on the preset air feeling mode among at least two indoor units as the target indoor unit.

[0091] During the process of the target indoor unit operating in the preset air feeling mode, the indoor ambient humidity of the space where the target indoor unit is located can be detected in real time or at an interval of a set duration. The indoor ambient humidity of the space where the target indoor unit is located can be detected by a humidity sensor provided in the target indoor unit.

[0092] Step S202, determine the second evaporation parameter according to the first ambient humidity.

[0093] The indoor heat exchanger temperatures corresponding to the second evaporation parameters corresponding to different first ambient humidities have different values. Specifically, the greater the first ambient humidity, the greater the indoor heat exchanger temperature corresponding to the second evaporation parameter. On the contrary, the smaller the first ambient humidity, the smaller the indoor heat exchanger temperature corresponding to the second evaporation parameter.

[0094] The correspondence between the first environmental humidity and the second evaporation parameter can be preset in forms such as calculation formulas, mapping relationships, etc. Based on this correspondence, the second evaporation parameter corresponding to the current first environmental humidity can be determined. For example, a calculation formula between humidity and superheat can be preset, and by substituting the first environmental humidity of the current target indoor unit into this calculation formula, the second evaporation parameter corresponding to the target indoor unit can be calculated; alternatively, a mapping table between humidity and superheat can be preset, and by querying this mapping table with the first environmental humidity of the current target indoor unit, the result obtained by matching can be used as the second evaporation parameter corresponding to the target indoor unit.

[0095] Among them, when the number of target indoor units is more than one, that is, when the number of indoor units with the preset air feeling mode turned on is more than one, the second evaporation parameter can be determined according to the first environmental humidity corresponding to each of the more than one target indoor units respectively; it is also possible to determine the first environmental humidity of the target indoor unit with the highest priority among the more than one target indoor units (for example, the target indoor unit corresponding to an indoor space with people has a higher priority than the target indoor unit corresponding to an indoor space without people, or the target indoor unit corresponding to an indoor space with preset type of equipment (such as precision equipment) has a higher priority than other target indoor units, etc.) to determine the second evaporation parameter.

[0096] Furthermore, if the number of target indoor units is different, the correspondence between the first environmental humidity and the second evaporation parameter can be different. Specifically, more than one preset correspondence between humidity and evaporation parameter can be preset, and each preset correspondence can be associated with a different quantity. Based on this, the quantity of the indoor units with the preset air feeling mode turned on currently can be determined, the preset correspondence associated with this quantity can be obtained, and the second evaporation parameter corresponding to the first environmental humidity can be determined based on the obtained preset correspondence.

[0097] In this embodiment, on the basis of ensuring the refrigeration effect through a lower indoor heat exchanger temperature in the first stage, in the second stage, the second evaporation parameter is determined in combination with the environmental humidity of the space where the indoor unit with the preset air feeling mode is located, so as to ensure the accuracy of the determined second evaporation parameter, realize that the operation of the compressor can match the environmental humidity situation of the indoor unit with the preset air feeling mode turned on, and ensure that when the compressor is controlled to operate according to the second evaporation parameter, the air outlet temperature of the indoor unit with the preset air feeling mode turned on will not be too low, effectively preventing the indoor unit from having the condensation problem.

[0098] Furthermore, in this embodiment, the process of obtaining the first environmental humidity is specifically as follows: if the number of target indoor units is more than one, the sub-environmental humidity of the space where each indoor unit with the preset air feeling mode is located is obtained; the first environmental humidity is determined according to the more than one sub-environmental humidity.

[0099] Specifically, one of the humidity levels of more than one sub-environment can be selected as the first environmental humidity; alternatively, the first environmental humidity can be obtained through comprehensive calculation of the humidity levels of more than one sub-environment.

[0100] In this embodiment, among the humidity levels of more than one sub-environment, the sub-environment humidity with the largest value is determined as the first environmental humidity. In other embodiments, the average value of the humidity levels of more than one sub-environment can also be used as the first environmental humidity.

[0101] In this embodiment, when more than one indoor unit activates the preset air feeling mode, the second evaporation parameter for controlling the operation of the compressor is determined by comprehensively considering the sub-humidity levels corresponding to the spaces where each indoor unit is located, thereby ensuring that the operation of the compressor can prevent condensation from occurring in each indoor unit that activates the preset air feeling mode. Among them, using the largest sub-environment humidity as the first environmental humidity to determine the second evaporation parameter further guarantees that condensation will not occur in all indoor units that activate the preset air feeling mode, ensuring the normal operation of the multi-split air conditioner.

[0102] Furthermore, based on any of the above embodiments, another embodiment of the control method for the multi-split air conditioner of the present application is proposed. In this embodiment, referring to Figure 4 , after step S10, the following steps are further included:

[0103] Step S101: Obtain the number of target indoor units and the continuous operation duration of the compressor after the preset air feeling mode is activated; the target indoor units are the indoor units among the at least two indoor units that activate the preset air feeling mode;

[0104] Step S102: Determine whether the number of target indoor units is greater than or equal to the target number and whether the continuous operation duration is greater than or equal to the preset duration;

[0105] When the number of target indoor units is greater than or equal to the target number and the continuous operation duration is greater than or equal to the preset duration, step S103 is executed;

[0106] Step S103: Determine that the multi-split air conditioner has reached the first preset condition; when the number of target indoor units is less than the target number, or when the continuous operation duration is less than the preset duration, return to step S10.

[0107] The target number here can be a pre-set number or a number determined according to the total number of indoor units currently in the on state in the multi-split air conditioner. The target number is less than or equal to the total number of indoor units in the on state.

[0108] In this embodiment, the total number of indoor units that are currently in the on state among the at least two indoor units is obtained as the target quantity. That is, when all the turned-on indoor units turn on the preset air feeling mode, the evaporation parameter is increased to make the compressor run at a reduced frequency; otherwise, a lower evaporation parameter is maintained to make the compressor run at a higher frequency.

[0109] In this embodiment, only when the number of indoor units with the preset air feeling mode turned on is large enough and the continuous operation duration of the compressor is long enough, the evaporation parameter is increased to make the compressor run at a reduced frequency; otherwise, a lower evaporation parameter is maintained to make the compressor run at a higher frequency, so as to avoid the unnecessary frequency reduction of the compressor from affecting the refrigeration effect of the indoor units without the preset air feeling mode turned on.

[0110] Further, based on any of the above embodiments, another embodiment of the control method for the multi-connected air conditioner of the present application is proposed. In this embodiment, with reference to Figure 5 , during the execution of step S10, the following is further included:

[0111] Step S100, adjusting the opening degree of the target electronic expansion valve according to the preset superheat degree;

[0112] Wherein, the target indoor unit is defined as the indoor unit among the at least two indoor units that turns on the preset air feeling mode, and the target electronic expansion valve is the electronic expansion valve in the target indoor unit.

[0113] The preset superheat degree is the target value of the superheat degree of the indoor heat exchanger preset for the purpose of achieving temperature reduction in the preset air feeling mode. Define the refrigerant outlet temperature of the indoor heat exchanger as T2B and the refrigerant inlet temperature of the indoor heat exchanger as T2A, then the superheat degree SH = T2B - T2A.

[0114] Adjust the opening degree of the electronic expansion valve according to the preset superheat degree, so that the actual superheat degree of the indoor heat exchanger in the target indoor unit reaches the preset superheat degree.

[0115] The larger the target value of the superheat degree of the indoor heat exchanger, the smaller the opening degree of the electronic expansion valve; conversely, the smaller the target value of the superheat degree of the indoor heat exchanger, the larger the opening degree of the electronic expansion valve.

[0116] In this embodiment, during the startup stage of the preset air feeling mode of the indoor unit, when controlling the operation of the compressor according to the first evaporation parameter, the electronic expansion valve of the target indoor unit is controlled with the preset superheat degree, so as to realize that the environmental temperature in the space where the target indoor unit with low air volume output is located can rapidly drop in the initial stage of the preset air feeling mode, ensuring the thermal comfort of users in the space where the target indoor unit is located.

[0117] Further, in this embodiment, with reference to Figure 5 , after step S20, the following is further included:

[0118] Step S30, when the multi-connected air conditioner operates to reach the second preset condition, control the opening degree of the target electronic expansion valve according to the target superheat degree.

[0119] Wherein, the target superheat degree is determined according to the second environmental humidity of the space where the target indoor unit is located, and the target superheat degree is greater than or equal to the preset superheat degree.

[0120] The second preset condition here is specifically the condition that the operating parameters of the air conditioner or the environmental parameters of the environment where the air conditioner is located need to reach when there is a risk of condensation in the preset target indoor unit.

[0121] Specifically, taking the target superheat degree as the target, adjust the opening degree of the electronic expansion valve in the target indoor unit to adjust the refrigerant flow rate in the indoor heat exchanger of the target indoor unit, so that the actual superheat degree of the indoor heat exchanger in the target indoor unit reaches the target superheat degree.

[0122] The larger the target value of the superheat degree of the indoor heat exchanger, the smaller the opening degree of the electronic expansion valve; on the contrary, the smaller the target value of the superheat degree of the indoor heat exchanger, the larger the opening degree of the electronic expansion valve. Based on this, when the electronic expansion valve operates according to the preset superheat degree, the opening degree of the electronic expansion valve is greater than or equal to the opening degree of the electronic expansion valve when the electronic expansion valve operates according to the target superheat degree.

[0123] Wherein, when the number of target indoor units is more than one, control the opening degree of the electronic expansion valve in each target indoor unit to be adjusted respectively according to the target superheat degree corresponding to each target indoor unit. For example, when any two of the indoor units with more than one target indoor unit are respectively defined as the first indoor unit and the second indoor unit, the target superheat degree corresponding to the first indoor unit is the first superheat degree, and the target superheat degree corresponding to the second indoor unit is the second superheat degree, then control the opening degree of the electronic expansion valve in the first indoor unit to be adjusted according to the first superheat degree, so that the actual superheat degree of the indoor heat exchanger in the first indoor unit reaches the first superheat degree; control the opening degree of the electronic expansion valve in the second indoor unit to be adjusted according to the second superheat degree, so that the actual opening degree of the indoor heat exchanger in the second indoor unit reaches the second superheat degree.

[0124] Specifically, define the indoor units other than the target indoor unit among all the currently turned-on indoor units of the multi-connected air conditioner as other indoor units. During the process of controlling the opening degree of the target electronic expansion valve to be adjusted according to the target superheat degree, the opening degree of the electronic expansion valve in other indoor units can be controlled to be adjusted according to the preset superheat degree.

[0125] In this embodiment, first, the anti-condensation effect of the preset air feeling mode is achieved by adjusting the compressor frequency (especially when the preset air feeling mode is turned on for all the currently turned-on indoor units), and then the anti-condensation problem is solved by adjusting the superheat degree of the target indoor unit, so as to ensure the reliability of the system operation.

[0126] Moreover, by adjusting the opening degree of the electronic expansion valve in the target indoor unit through superheat, the frequency adjustment of the compressor can be reduced, thereby reducing the impact of the compressor frequency adjustment on the refrigeration effect of other indoor units that are in the on state but do not turn on the preset air feeling mode, meeting the low wind speed air feeling requirement of the space where the target indoor unit is located while maintaining the refrigeration effect of other spaces.

[0127] In addition, when the number of indoor units in the multi-connected air conditioner in the on state is one, and this indoor unit turns on the preset air feeling mode, the output capacity of the multi-connected air conditioner compressor is generally large. Therefore, even when the compressor operates at the lowest frequency, the outlet air temperature of the target indoor unit will still be on the low side. In this embodiment, the opening degree of the electronic expansion valve in the target indoor unit is adjusted in the above manner to avoid the outlet air temperature being too low, prevent condensation from occurring in the target indoor unit, and ensure the comfort of users in the space where the target indoor unit is located.

[0128] In addition, after step S10, when the multi-connected air conditioner operation does not reach the first preset condition, step S30 here can also be executed to achieve anti-condensation of the target indoor unit through superheat adjustment.

[0129] Further, in this embodiment, the second preset condition includes at least one of the following:

[0130] Condition 1: The continuous duration of the target indoor unit turning on the preset air feeling mode is greater than the set duration; the set duration here is greater than the preset duration corresponding to the first preset condition in the above embodiment.

[0131] Condition 2: The current evaporation temperature of the target indoor unit is less than the target evaporation temperature, or the current evaporation pressure of the target indoor unit is less than the target evaporation pressure; the target evaporation temperature or the target evaporation pressure is determined according to the second environmental humidity;

[0132] Condition 3: The exhaust temperature of the compressor is less than the preset exhaust temperature;

[0133] Condition 4: The exhaust superheat of the compressor is less than the preset exhaust superheat.

[0134] In an implementation manner of this embodiment, the second preset condition includes all the above-listed conditions. That is to say, during the process of controlling the electronic expansion valve in the target indoor unit with the preset superheat as the target, when conditions 1, 2, 3, and 4 are all met simultaneously, the electronic expansion valve is controlled to operate according to the target superheat; when any one of conditions 1, 2, 3, and 4 is not met, the opening degree of the electronic expansion valve is maintained to be adjusted according to the preset superheat.

[0135] In another implementation manner of this embodiment, the second preset condition may include some of the above-listed conditions. That is to say, during the process of controlling the electronic expansion valve in the target indoor unit with a preset superheat degree as the target, when the air conditioner operation satisfies some of the above conditions 1, 2, 3, and 4, the electronic expansion valve is controlled to operate according to the target superheat degree; when the air conditioner operation does not satisfy any of the above conditions 1, 2, 3, and 4, the electronic expansion valve is maintained to be adjusted according to the preset superheat degree.

[0136] Here, when the multi-connected air conditioner operation reaches the above conditions, it can be considered that the condensation risk of the target indoor unit with the preset air feeling mode turned on is relatively large. At this time, the target electronic expansion valve is controlled to operate in a timely manner through the target superheat degree to reduce the refrigerant flow rate in the target indoor unit, so as to timely increase the air outlet temperature of the target indoor unit and effectively prevent the target indoor unit from condensing.

[0137] Furthermore, in this embodiment, the target evaporation temperature or the target evaporation pressure can be determined according to the second ambient humidity of the target indoor unit; the target evaporation temperature or the target evaporation pressure increases as the second ambient humidity increases. On the contrary, the target evaporation temperature or the target evaporation pressure decreases as the second ambient humidity decreases. Based on this, it can ensure that the temperature drop effect in the space where the target indoor unit is located is satisfied while its air outlet temperature will not be too low.

[0138] Furthermore, in this embodiment, after step S30, it further includes:

[0139] When the multi-connected air conditioner operation reaches the third preset condition, return to execute the step of controlling the target electronic expansion valve to adjust the opening according to the preset superheat degree;

[0140] The third preset condition includes at least one of the following:

[0141] Condition 5, the target indoor unit exits the preset air feeling mode;

[0142] Condition 6, the exhaust temperature of the compressor is greater than or equal to the preset exhaust temperature;

[0143] Condition 7, the exhaust superheat degree of the compressor is greater than or equal to the preset exhaust superheat degree.

[0144] The third preset condition is specifically the conditions that the operating parameters of the air conditioner or the environmental parameters of the environment where the air conditioner is located need to reach when there is no condensation risk in the preset target indoor unit or when there is a reliability risk in the multi-connected air conditioner.

[0145] In this embodiment, during the process of controlling the operation of the target electronic expansion valve through the target superheat degree to prevent the target indoor unit from having a condensation problem, when the air conditioner operation reaches the second preset condition, switch to a smaller preset superheat degree to control the operation of the target electronic expansion valve, which can increase the opening degree of the target electronic expansion valve, effectively avoid the reliability problem of the system caused by the target electronic expansion valve operating at a small opening degree for a long time, ensure that the anti-condensation and refrigeration effects can be effectively balanced when the multi-connected air conditioner turns on the windless feeling function, and ensure the reliable operation of the multi-connected air conditioner.

[0146] In this embodiment, when the air conditioner meets any one of conditions 5, 6, and 7, switch to controlling the opening degree of the electronic expansion valve with a preset superheat degree. In other embodiments, when the air conditioner meets any two or all of conditions 5, 6, and 7, switch to controlling the opening degree of the electronic expansion valve with a preset superheat degree.

[0147] When the target indoor unit exits the preset wind feeling mode, it indicates that there is no longer a condensation risk for the target indoor unit. At this time, the target indoor unit can switch to a smaller target superheat degree for operation to ensure the refrigeration effect of the space where the target indoor unit is located. Among them, if the number of target indoor units is more than one, if some target indoor units exit the preset wind feeling mode while others are still in the preset wind feeling mode, the electronic expansion valve in the indoor unit that exits the preset wind feeling mode adjusts the opening degree according to the preset superheat degree, and the electronic expansion valve in the indoor unit that is in the preset wind feeling mode maintains the opening degree adjustment with the target superheat degree.

[0148] The preset exhaust temperature and the preset exhaust superheat degree are specifically critical parameters for distinguishing whether the compressor operates reliably. When the preset exhaust temperature or the preset exhaust superheat degree is too large, switch to a smaller preset superheat degree to control the electronic expansion valve to adjust the opening degree, increase the opening degree of the electronic expansion valve, and avoid the exhaust temperature or the exhaust superheat degree from being too high, so as to ensure the reliable operation of the multi-connected air conditioner.

[0149] In addition, an embodiment of the present invention also proposes a computer-readable storage medium, on which a control program for a multi-connected air conditioner is stored. When the control program for the multi-connected air conditioner is executed by a processor, the relevant steps of any one of the above embodiments of the control method for the multi-connected air conditioner are implemented.

[0150] It should be noted that in this article, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or system. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or system including that element.

[0151] The serial numbers of the embodiments of the present invention above are only for description and do not represent the advantages or disadvantages of the embodiments.

[0152] Through the description of the above embodiments, those skilled in the art can clearly understand that the above embodiment methods can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, in essence 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 as described above (such as ROM / RAM, magnetic disk, optical disc), and includes several instructions to enable a terminal device (which can be a mobile phone, computer, server, multi-connected air conditioner, or network device, etc.) to execute the methods described in various embodiments of the present invention.

[0153] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A control method for a multi-connected air conditioner, characterized in that, The multi-connected air conditioner includes a compressor and at least two indoor units, the compressor is connected to each of the indoor units, and the control method of the multi-connected air conditioner includes the following steps: When the multi-connected air conditioner is in cooling operation, if the indoor unit among the at least two indoor units starts a preset air feeling mode, the compressor is controlled to operate according to the first evaporation parameter; the air outlet speed of the indoor unit corresponding to the preset air feeling mode is less than the preset speed; When the multi-connected air conditioner runs to reach the first preset condition, the compressor is controlled to operate according to the second evaporation parameter; Wherein, both the first evaporation parameter and the second evaporation parameter are characterization parameters of the target evaporation state that the indoor heat exchanger in the indoor unit needs to reach, and the temperature of the indoor heat exchanger corresponding to the second evaporation parameter is greater than the temperature of the indoor heat exchanger corresponding to the first evaporation parameter; After the step of controlling the compressor to operate according to the first evaporation parameter, it further includes: Obtaining the number of target indoor units and the continuous operation duration of the compressor after the preset air feeling mode is started; the target indoor unit is the indoor unit that starts the preset air feeling mode among the at least two indoor units; When the number of the target indoor units is greater than or equal to the target number and the continuous operation duration is greater than or equal to the preset duration, it is determined that the multi-connected air conditioner runs to reach the first preset condition, and the total number of the currently turned-on indoor units among the at least two indoor units is the target number.

2. The control method of the multi-connected air conditioner according to claim 1, characterized in that, Before the step of controlling the compressor to operate according to the second evaporation parameter, it further includes: When the multi-connected air conditioner runs to reach the first preset condition, obtaining the first environmental humidity of the space where the indoor unit that starts the preset air feeling mode is located; Determining the second evaporation parameter according to the first environmental humidity.

3. The control method of the multi-connected air conditioner according to claim 2, wherein The step of obtaining the first environmental humidity of the space where the indoor unit that starts the preset air feeling mode is located includes: If the number of target indoor units is more than one, obtaining the sub-environmental humidity of the space where each indoor unit that starts the preset air feeling mode is located; Determining the first environmental humidity according to more than one sub-environmental humidity.

4. The control method of the multi-connected air conditioner according to claim 3, wherein, The step of determining the first environmental humidity according to more than one sub-environmental humidity includes: Among more than one sub-environmental humidity, determining the sub-environmental humidity with the largest value as the first environmental humidity.

5. The control method of the multi-connected air conditioner according to claim 1, characterized in that, After the step of controlling the compressor to operate according to the first evaporation parameter, it further includes: When the number of the target indoor units is less than the target number, or when the continuous operation duration is less than the preset duration, return to execute the step of controlling the compressor to operate according to the first evaporation parameter.

6. The control method of the multi-connected air conditioner according to claim 1, characterized in that, The first evaporation parameter includes a first evaporation temperature, the second evaporation parameter includes a second evaporation temperature, and the first evaporation temperature is less than the second evaporation temperature; Or, the first evaporation parameter includes a first evaporation pressure, the second evaporation parameter includes a second evaporation pressure, and the first evaporation pressure is less than the second evaporation pressure.

7. The control method of the multi-connected air conditioner according to any one of claims 1 to 6, characterized in that, During the execution of the step of controlling the compressor to operate according to the first evaporation parameter, it further includes: Controlling the opening of the target electronic expansion valve according to the preset superheat degree; Wherein, the target indoor unit is the indoor unit that turns on the preset air feeling mode among the at least two indoor units, and the target electronic expansion valve is the electronic expansion valve in the target indoor unit.

8. The control method of the multi-connected air conditioner according to claim 7, characterized in that, After the step of controlling the operation of the compressor according to the second evaporation parameter, the method further includes: When the multi-connected air conditioner runs to reach a second preset condition, controlling the target electronic expansion valve to adjust the opening degree according to the target superheat degree; Wherein, the target superheat degree is determined according to the second ambient humidity of the space where the target indoor unit is located, and the target superheat degree is greater than or equal to the preset superheat degree.

9. The control method of the multi-connected air conditioner according to claim 8, characterized in that, The second preset condition includes at least one of the following: The continuous duration for which the target indoor unit turns on the preset air feeling mode is greater than the set duration; The current evaporation temperature of the target indoor unit is less than the target evaporation temperature, or the current evaporation pressure of the target indoor unit is less than the target evaporation pressure; the target evaporation temperature or the target evaporation pressure is determined according to the second ambient humidity; The exhaust temperature of the compressor is less than the preset exhaust temperature; The exhaust superheat degree of the compressor is less than the preset exhaust superheat degree.

10. The control method of the multi-connected air conditioner according to claim 8, characterized in that, After the step of controlling the target electronic expansion valve to adjust the opening degree according to the target superheat degree, the method further includes: When the multi-connected air conditioner runs to reach a third preset condition, returning to execute the step of controlling the target electronic expansion valve to adjust the opening degree according to the preset superheat degree; The third preset condition includes at least one of the following: The target indoor unit exits the preset air feeling mode; The exhaust temperature of the compressor is greater than or equal to the preset exhaust temperature; The exhaust superheat degree of the compressor is greater than or equal to the preset exhaust superheat degree.

11. A multi-connected air conditioner, characterized in that, The multi-connected air conditioner includes: At least two indoor units; A compressor, the compressor is connected to each of the indoor units; A control device, the indoor unit and the compressor are both connected to the control device, the control device includes: a memory, a processor, and a control program of the multi-connected air conditioner stored on the memory and executable on the processor, and when the control program of the multi-connected air conditioner is executed by the processor, the steps of the control method of the multi-connected air conditioner according to any one of claims 1 to 10 are implemented.

12. A computer-readable storage medium, characterized in that, A control program of the multi-connected air conditioner is stored on the computer-readable storage medium, and when the control program of the multi-connected air conditioner is executed by the processor, the steps of the control method of the multi-connected air conditioner according to any one of claims 1 to 10 are implemented.

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