CN112797598B - Indoor unit control method and device of multi-connected air conditioner and air conditioner - Google Patents

Abstract

The invention discloses a control method and a device for an indoor unit of a multi-connected air conditioner and the air conditioner, wherein the control method for the indoor unit of the multi-connected air conditioner comprises the following steps: acquiring the capacity variation and the number variation of indoor units of the multi-connected air conditioner in a preset period; judging whether each electronic expansion valve corresponding to the indoor unit meets the sequencing control condition or not based on the capacity variation and the number variation; the sequencing control condition is related to the number of target indoor units which are turned on or turned off in a preset period; if so, determining the opening sequence and/or closing sequence of the electronic expansion valve corresponding to each target indoor unit, and controlling the opening and/or closing of the electronic expansion valve corresponding to each target indoor unit based on the opening sequence and/or closing sequence. The invention can slow down the fluctuation degree of the multi-connected air conditioner, improves the stability of the operation of the multi-connected air conditioner and further improves the comfort experience of users.

Description

Indoor unit control method, device and air conditioner of multi-connected air conditioner

technical field

The present invention relates to the technical field of air conditioners, and in particular, to an indoor unit control method and device of a multi-connected air conditioner, and an air conditioner.

Background technique

A multi-unit air conditioner is an air conditioner unit in which the outdoor unit is connected to multiple indoor units of different models or capacities. Multiple indoor units of a multi-unit air conditioner can be distributed in different indoor areas. Each indoor unit is equipped with an independent electronic expansion valve for refrigerant throttling and flow control. It often happens that some indoor units are turned off or turned on at the same time. However, when multiple indoor units need to be turned off or on at the same time, the electronic expansion valves of these indoor units will be turned off or on at the same time, resulting in an unbalanced refrigerant flow, resulting in large fluctuations, resulting in unstable operation of the air-conditioning system. The open indoor unit will also cause the coil temperature to decrease first and then increase due to the unbalanced refrigerant distribution, resulting in large fluctuations in the outlet air temperature and poor user comfort.

SUMMARY OF THE INVENTION

In order to solve the above problems, the present invention provides an indoor unit control method, device and air conditioner for a multi-connected air conditioner, which can slow down the fluctuation degree of the multi-connected air conditioner, improve the operation stability of the multi-connected air conditioner, and further improve the performance of the multi-connected air conditioner. User comfort experience.

According to an embodiment of the present invention, on the one hand, a method for controlling an indoor unit of a multi-connected air conditioner is provided, including: acquiring a capacity change and a change in the number of indoor units of a multi-connected air conditioner within a preset period; The amount of change and the amount of change in the number of units are used to determine whether each electronic expansion valve corresponding to the indoor unit satisfies the sequence control condition; wherein, the sequence control condition is related to the number of target indoor units that are turned on or off within a preset period; if it is , determine the opening sequence and/or closing sequence of the electronic expansion valve corresponding to each of the target indoor units, and control the opening and/or closing sequence of the electronic expansion valve corresponding to each of the target indoor units based on the opening sequence and/or the closing sequence closure.

By adopting the above technical solution, the electronic expansion valves that are opened or closed at the same time are controlled in turn according to the opening sequence or the closing sequence, which can avoid the problem of unbalanced refrigerant flow in the pipeline to a certain extent, and reduce the fluctuation degree of the multi-connected air conditioner. , which improves the stability of the operation of the multi-connected air conditioner, thereby improving the user's comfort experience.

Preferably, the step of acquiring the capacity change amount and the number change amount of the multi-connected air conditioner indoor units within a preset period includes: acquiring an indoor unit power-on instruction or an indoor unit power-off instruction input by a user within a preset period; The power-on command or the power-off command determines the capacity change amount and the number change amount of the multi-connected air conditioners.

By adopting the above technical solution, it is possible to accurately monitor the number of startups, shutdowns and capacity changes of the indoor units in a preset period, which provides an important basis for judging whether the electronic expansion valve needs sequence control, and improves the control efficiency of the indoor unit of the multi-connected air conditioner. reliability.

Preferably, the step of judging whether the multi-connected air conditioner satisfies the sequence control condition based on the capacity change amount and the number change amount includes: determining, based on the capacity change amount, the number of indoor units in the preset period. Capacity change rate; when the absolute value of the capacity change rate is greater than or equal to the first change rate, and the absolute value of the change in the number of units is greater than or equal to the first quantity, it is determined that the multi-connected air conditioner satisfies the sequence control condition.

By adopting the above technical solution to determine whether the multi-connected air conditioner satisfies the sequence control conditions, it is possible to avoid the problem that the operation of the air conditioner is fluctuated due to the simultaneous operation of multiple electronic expansion valves when multiple indoor units are turned on or off at the same time, and the multi-connected air conditioner is improved. Operational stability.

Preferably, the step of determining the opening sequence and/or closing sequence of the electronic expansion valve corresponding to each of the target indoor units includes: acquiring the current set wind profile, indoor unit capacity and indoor temperature difference of each of the target indoor units ; wherein, the indoor temperature difference is the difference between the ambient temperature of the target indoor unit and the current set temperature; the current set air profile, the indoor temperature difference and the capacity of the indoor unit are prioritized to obtain Priority ranking result; determining the opening sequence and/or closing sequence of the electronic expansion valve corresponding to each target indoor unit based on the priority ranking result.

By adopting the above technical solution, the opening or closing of the electronic expansion valve can be sequenced based on the current set wind speed of the indoor unit, the indoor temperature difference and the capacity of the indoor unit, and the electronic expansion valve can be controlled according to the actual operating state of the indoor unit, improving the Reliability of indoor unit electronic expansion valve control.

Preferably, the priority sorting result is the current set wind speed, the indoor temperature difference and the capacity of the indoor unit in sequence; the electronic expansion corresponding to each target indoor unit is determined based on the priority sorting result The steps of valve opening sequence and/or closing sequence include: determining the opening sequence and/or closing sequence of the electronic expansion valve corresponding to each target indoor unit based on the gear level of each currently set wind gear; wherein, The opening sequence is obtained by sorting the currently set wind gears of each of the target indoor units in the order from high gear to low gear, and the closing sequence is obtained from the current setting wind gears of each target indoor unit from low gear to high gear. When there are two or more second target indoor units in the target indoor unit, determine the corresponding second target indoor unit based on the indoor temperature difference and the capacity of the indoor unit. The opening sequence and/or closing sequence of the electronic expansion valve; wherein, the currently set wind speed of each of the second target indoor units is the same.

By adopting the above technical solution, the electronic expansion valve is opened according to the order of the target indoor unit gears from high to low, and the electronic expansion valve is closed in the order of the target indoor unit gears from low to high. The stability of the operation of the multi-connected air conditioner. When the current set air level input by the user is a high level, it usually indicates that the user has a large demand for air supply. By preferentially opening the electronic expansion valve of the high-level indoor unit, the low-level indoor unit is preferentially closed. The electronic expansion valve avoids the insufficient evaporation of the liquid refrigerant causing the compressor to return to liquid, and ensures the reliability of the compressor operation.

Preferably, the step of determining the opening sequence and/or closing sequence of the electronic expansion valve corresponding to each of the second target indoor units based on the indoor temperature difference and the capacity of the indoor unit includes: based on each of the second targets The size of the indoor temperature difference corresponding to the indoor unit determines the opening sequence and/or closing sequence of the electronic expansion valve corresponding to each of the second target indoor units; wherein, the opening sequence of the electronic expansion valve corresponding to the second target indoor unit is determined by each The indoor temperature difference of the second target indoor unit is sorted and obtained in descending order, and the closing order of the electronic expansion valve corresponding to the second target indoor unit is from the indoor temperature difference of each second target indoor unit in descending order. When there are two or more third target indoor units in the second target indoor unit, determine each third target indoor unit based on the indoor unit capacity of each third target indoor unit. The opening sequence and/or closing sequence of the electronic expansion valve corresponding to the target indoor unit; wherein, the indoor temperature difference of each of the third target indoor units is the same, and the opening sequence of the electronic expansion valve corresponding to the third target indoor unit is determined by each The indoor unit capacities of the third target indoor units are sorted in ascending order, and the closing order of the electronic expansion valves corresponding to the third target indoor units is determined by the indoor unit capacities of the third target indoor units in order of Sort from largest to smallest.

By adopting the above technical solution, when the current setting of the wind speed is the same, the opening sequence and closing sequence of the electronic expansion valve are sorted based on the indoor temperature difference, so as to avoid the fluctuation of the outlet air temperature of the multi-connected air conditioner, and the indoor temperature difference is larger by preferentially opening. The electronic expansion valve corresponding to the indoor unit with a smaller indoor temperature is given priority to close the electronic expansion valve corresponding to the indoor unit with smaller indoor temperature difference to meet the user’s temperature demand and improve the user’s comfort experience; by preferentially opening the electronic expansion valve corresponding to the indoor unit with smaller capacity The expansion valve, which preferentially closes the electronic expansion valve corresponding to the larger-capacity indoor unit, can reduce the fluctuation of the air conditioning system and improve the stability of the operation of the multi-connected air conditioner.

Preferably, the indoor unit control method for a multi-connected air conditioner further includes: when there are two or more fourth target indoor units in the third target indoor units, based on each of the fourth target indoor units determine the opening sequence of the electronic expansion valve corresponding to each of the fourth target indoor units; wherein, the capacity of the indoor units of each of the fourth target indoor units is the same; and/or, obtain each of the fourth target indoor units The operation time of each of the fourth target indoor units is determined based on the closing sequence of the electronic expansion valve corresponding to each of the fourth target indoor units. The communication address determines the closing sequence of the electronic expansion valve corresponding to each of the fourth target indoor units.

By adopting the above technical solution, the synchronous operation of the electronic expansion valves of multiple indoor units can avoid unstable operation of the air-conditioning system, reduce the temperature fluctuation of the coil, and improve the comfort of the air-conditioning blowing.

Preferably, the indoor unit control method for the multi-connected air conditioner further comprises: when the variation of the number of units is greater than a third number, controlling each unit based on a preset number of operations, the opening sequence and/or the closing sequence. The electronic expansion valve corresponding to the target indoor unit is opened and/or closed.

By adopting the above technical solution, when a large number of indoor units are turned on or off at the same time, the waiting time for turning on or turning off can be reduced, and the user experience is improved.

According to an embodiment of the present invention, on the other hand, an indoor unit control device for a multi-connected air conditioner is provided, including: an acquisition module configured to obtain a capacity change and a change in the number of indoor units of the multi-connected air conditioner within a preset period. The judging module is used for judging whether each electronic expansion valve corresponding to the indoor unit satisfies the sequence control condition based on the capacity change amount and the number change amount; The number of closed target indoor units is related; the control module is configured to determine the opening sequence and/or closing sequence of the electronic expansion valve corresponding to each target indoor unit when the multi-connected air conditioner satisfies the sequence control condition, based on the The opening sequence and/or the closing sequence controls the opening and/or closing of the electronic expansion valve corresponding to each of the target indoor units.

According to an embodiment of the present invention, another aspect provides an air conditioner, which is characterized by comprising a computer-readable storage medium storing a computer program and a processor, and when the computer program is read and executed by the processor, A method as described in any one of the first aspects is implemented.

According to an embodiment of the present invention, another aspect provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is read and executed by a processor, the The method of any one of the first aspects.

The invention has the following beneficial effects: it is judged whether the multi-connected air conditioner satisfies the sequence control condition based on the capacity change of the indoor units and the change of the number of units, and the electronic expansion valve connected to each target indoor unit that satisfies the sequence control condition is opened according to the sequence control condition. Turning on or off sequentially or in turn can avoid the problem of unbalanced refrigerant flow in the pipeline to a certain extent, slow down the fluctuation of the multi-connected air conditioner, and improve the stability of the operation of the multi-connected air conditioner, thereby improving the user experience. comfort experience.

Description of drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that are required to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those of ordinary skill in the art, other implementation drawings can also be obtained according to the extension of the drawings provided without creative efforts.

The structures, proportions, sizes, etc. shown in this specification are only used to cooperate with the contents disclosed in the specification, so as to be understood and read by those who are familiar with the technology, and are not used to limit the conditions for the implementation of the present invention, so there is no technical The substantive meaning above, any modification of the structure, the change of the proportional relationship or the adjustment of the size should still fall within the technical content disclosed in the present invention without affecting the effect and the purpose that the present invention can produce. within the range that can be covered.

1 is a flowchart of an indoor unit control method for a multi-connected air conditioner provided by the present invention;

2 is a schematic structural diagram of a multi-connected air conditioner provided by the present invention;

3 is a schematic structural diagram of an indoor unit control device of a multi-connected air conditioner provided by the present invention.

icon:

21～2i-indoor unit; EEV1～EEVi-electronic expansion valve; Ta(1)～Ta(i)-ambient temperature.

Detailed ways

The embodiments of the present invention are described below by specific specific embodiments. Those who are familiar with the technology can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are part of the present invention. , not all examples. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In order to make the above objects, features and advantages of the present invention more clearly understood, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Example 1:

This embodiment provides an indoor unit control method for a multi-connected air conditioner, and the method can be applied to a multi-connected air conditioner. Referring to the flowchart of the indoor unit control method for a multi-connected air conditioner shown in FIG. 1 , the method mainly includes the following steps: The following steps S102 to S106:

Step S102, acquiring the capacity change amount and the number change amount of the indoor units of the multi-connected air conditioner within a preset period.

The above-mentioned multi-connected air conditioner includes a plurality of indoor units, and each indoor unit is independently provided with a corresponding electronic expansion valve. Each electronic expansion valve is used to control the flow of refrigerant flowing to the indoor unit. Correspondingly controls the flow of refrigerant flowing into the indoor unit. When it is detected that the indoor unit capacity of the multi-connected air conditioner changes, the capacity change of the indoor unit of the multi-connected air conditioner is determined according to the indoor unit start-up instruction input by the user; the above-mentioned change in the number of units includes the increase or decrease of the indoor unit, Determine the increase in the number of indoor units turned on according to the number of received power-on commands, and determine the decrease in the number of indoor units turned off according to the number of received shutdown commands. The above indoor unit capacity is also the rated capacity of the indoor unit, and the unit is KW.

Step S104, it is determined whether each electronic expansion valve corresponding to the indoor unit satisfies the sequence control condition based on the change in capacity and the change in the number of units.

The above sequence control conditions are related to the number of target indoor units that are turned on or off in the preset period. When the number of indoor units that are turned on or off in the preset period is large, the electronic expansion valves of multiple indoor units need to be synchronized. Avoid the problem of unbalanced refrigerant flow in the air-conditioning system that causes large fluctuations in the air-conditioning system. Based on the change in the capacity of the indoor units and the change in the number of units, it is determined whether the electronic expansion valves of the target indoor units that are turned on or off at the same time need to be sequenced and controlled, that is, the number of target indoor units that are turned on at the same time or the number of target indoor units that are turned off at the same time. Whether the quantity will cause large fluctuations in the air conditioning system.

Step S106, if yes, determine the opening sequence and/or closing sequence of the electronic expansion valve corresponding to each target indoor unit, and control the electronic expansion valve corresponding to each target indoor unit to open and/or close based on the opening sequence and/or closing sequence.

When the above-mentioned multi-connected air conditioner satisfies the sequence control conditions, that is, when there are multiple target indoor units corresponding to the electronic expansion valves that need to be opened or closed at the same time, set the opening sequence for each expansion valve that needs to be opened within a preset period, A closing sequence is set for each expansion valve that is closed within a preset period, and based on the set opening sequence and/or closing sequence, the electronic expansion valve connected to each target indoor unit is controlled to be opened and/or closed.

In the indoor unit control method for the multi-connected air conditioner provided in this embodiment, it is judged whether the multi-connected air conditioner satisfies the sequence control condition based on the change in capacity and the change in the number of indoor units, and for each target indoor unit that satisfies the sequence control condition The connected electronic expansion valve is opened or closed in turn according to the opening sequence or closing sequence, which can avoid the problem of unbalanced refrigerant flow in the pipeline to a certain extent, reduce the fluctuation degree of the multi-connected air conditioner, and improve the operation of the multi-connected air conditioner. stability, thereby improving the user's comfort experience.

In order to improve the reliability of the control of the multi-connected air conditioner indoor units, this embodiment provides a specific implementation method for obtaining the capacity change and the number change of the multi-connected air conditioner indoor unit within a preset period: The inputted indoor unit power-on command or indoor power-off command; according to the power-on command or the power-off command, the capacity change and the number of units of the multi-connected air conditioner are determined. When the user needs to turn on or off an indoor unit, the indoor unit power-on command or the indoor unit power-off command will be sent to the multi-connector. is the address or number of the indoor unit).

Since the capacity information of each indoor unit is stored in the multi-connected air conditioner, the preset cycle is determined according to the number of startup commands or shutdown commands received in the preset cycle by obtaining the startup commands and shutdown commands input by the user within the preset cycle. The amount of change in the number of indoor units; according to the capacity information of the indoor unit that produces the change, the capacity change of the indoor unit in the preset period can be determined, and the number of startups, shutdowns and capacity changes of the indoor units in the preset period can be accurately monitored. Whether the electronic expansion valve needs sequencing control provides an important basis and improves the reliability of the indoor unit control of the multi-connected air conditioner.

In order to improve the stability of the operation of the multi-connected air conditioners, this embodiment provides an implementation manner of judging whether the multi-connected air conditioners meet the sequence control conditions based on the change in capacity and the change in the number of units. For details, refer to the following steps (1) to (2) )implement:

Step (1): Determine the capacity change rate of the indoor unit in the preset period based on the capacity change amount.

The capacity change rate of the indoor unit in the preset period ΔQ=(Qc(t)-Qc(t-L))/Qc(t-L), where L is the preset period, and (Qc(t)-Qc(t-L)) is The capacity change in the preset period, Qc(t) is the capacity of the indoor unit obtained at any time t, and Qc(t-L) is the capacity of the indoor unit obtained at the time (t-L). The preset period L can be set according to the actual situation. When multiple electronic expansion valves are opened or closed at the same time within the length of L, which will cause the refrigerant distribution of the multi-connected air conditioner to be unbalanced, the length of L can be used as the preset period.

Step (2): When the absolute value of the capacity change rate is greater than or equal to the first change rate, and the absolute value of the change in the number of units is greater than or equal to the first number, it is determined that the multi-connected air conditioner satisfies the sequence control condition.

When |ΔQ|≥ζ, and |ΔN|≥a, it is determined that more than the first number of indoor units are turned on or off within the preset period, and then it is determined that the multi-connected air conditioner satisfies the sequence control condition, ΔQ is the capacity of the indoor unit The rate of change, ΔN is the amount of change in the number of units, ζ is the first rate of change, and a is the first number. That is, when ΔQ≥ζ and ΔN≥a, or when ΔQ≤-ζ and ΔN≤-a, it is determined that the multi-connected air conditioner satisfies the sequence control condition.

When ΔQ ≥ ζ and ΔN ≥ a, it means that the number of indoor units is newly increased, and the multi-connected air conditioner has multiple indoor units turned on in the preset cycle, and it is determined that the multi-connected air conditioner satisfies the sequence control conditions. When ΔQ≤-ζ and ΔN≤-a, the above-mentioned capacity change rate and unit number change are both negative values, indicating that the multi-unit air conditioner has multiple indoor units shut down within the preset period, and it is determined that the multi-unit air conditioner satisfies the sequence control condition. The first change rate can be any value between 30% and 50%, and the change in the number of units ΔN=Nc(t)-Nc(t-L), where Nc(t) is the total number of indoor units running at any time t , Nc(t-L) is the total number of indoor units running at time, and the above-mentioned first number may be any value between 2 and 5. For example, when the number of multi-connected air conditioners that are turned on in a preset cycle is greater than 2, or when the number of multi-connected air conditioners that are turned off in a preset cycle is greater than 2, it is determined that the indoor unit needs to be turned on or off. Sort control.

By judging whether the multi-connected air conditioner satisfies the sequence control conditions, it can avoid the problem that the operation of the air conditioner is fluctuated due to the simultaneous operation of multiple electronic expansion valves when multiple indoor units are turned on or off at the same time, and the stability of the operation of the multi-connected air conditioner is improved.

In order to improve the comfort of the user, this embodiment provides an implementation manner of determining the opening sequence and/or closing sequence of the electronic expansion valve corresponding to each target indoor unit, which may be specifically performed by referring to the following steps 1 to 3:

Step 1: Obtain the current set air profile, indoor unit capacity and indoor temperature difference of each target indoor unit.

Each indoor unit in the above multi-connected air conditioner is provided with an independent temperature sensor. The temperature sensor is used to detect the ambient temperature in the room where each indoor unit is located, obtain the current set temperature input by the user, and calculate the ambient temperature - the current set temperature. Difference, get the indoor temperature difference corresponding to the indoor unit.

The above target indoor units are multiple indoor units that have received a power-on command or a shutdown command within a preset period. Multi-connected air conditioners can obtain the running status of each indoor unit, and obtain the capacity of each target indoor unit and the user’s status in each indoor unit. The current set wind speed entered in the target indoor unit.

Step 2: Prioritize the currently set air profile, indoor temperature difference and indoor unit capacity to obtain the priority ranking result.

Prioritize multiple relevant parameters of the indoor unit obtained above, and obtain the priority ranking result of the currently set wind gear, indoor temperature difference and indoor unit capacity. The priority ranking result can indicate the importance of the starting sequence of the electronic expansion valve. degree. The above-mentioned ways of prioritizing the currently set wind profile, indoor temperature difference and indoor unit capacity can be set according to the user's demand for the multi-connected air conditioner.

When the user has high requirements for the comfort of the air conditioner, the above-mentioned priority sorting result can be the indoor temperature difference, the current set wind speed and the capacity of the indoor unit, so that the starting sequence or the closing sequence of the electronic expansion valve can be determined preferentially according to the indoor temperature difference of the indoor unit. , giving priority to meeting the user's temperature needs, reducing the indoor temperature difference, and improving the user's comfort experience. When the user has high requirements for the stability of the air conditioner, the above-mentioned priority sorting results can be the capacity of the indoor unit, the current set wind speed and the indoor temperature difference, so that the starting order or closing order of the electronic expansion valve can be determined according to the capacity of the indoor unit first, so as to avoid The large change in the capacity of the indoor unit leads to fluctuations in the air conditioning system, which improves the stability of the operation of the multi-connected air conditioner.

Step 3: Determine the opening sequence and/or closing sequence of the electronic expansion valve corresponding to each target indoor unit based on the priority sorting result.

Based on the priority sorting results of the currently set air profile, indoor temperature difference and indoor unit capacity, the electronic expansion valve corresponding to each target indoor unit is opened and/or closed to obtain the opening sequence and/or closing sequence. For details, please refer to the following Steps a to b are executed:

Step a: Determine the opening sequence and/or closing sequence of the electronic expansion valve corresponding to each target indoor unit based on the gear level of each currently set wind gear.

In a specific implementation manner, the above-mentioned priority sorting result is the current set wind profile, the indoor temperature difference, and the capacity of the indoor unit in sequence. The above opening sequence is obtained by sorting the currently set wind gears of each target indoor unit in the order of high gear to low gear, and the closing sequence is obtained by sorting the current setting wind gears of each target indoor unit in the order from low gear to high gear.

The above target indoor units are sorted according to the current set wind speed from high to low, and the sorting result is used as the opening sequence of the electronic expansion valve corresponding to each target indoor unit. The above target indoor units are sorted according to the current set damper in ascending order, and the sorting result is used as the closing sequence of the electronic expansion valve corresponding to each target indoor unit. Since the indoor unit with the high wind gear currently set can ensure sufficient air volume, the liquid refrigerant flowing through the heat exchanger absorbs heat and turns into a gaseous refrigerant, and the indoor unit with a low wind gear has a small air volume. If the liquid refrigerant evaporates If it is not enough, it will easily cause the compressor to return to the liquid.

When the electronic expansion valves of multiple indoor units operate synchronously, the refrigerant needs to be redistributed in the pipeline, causing the pressure on the suction side of the compressor to decrease first and then increase, resulting in unstable operation of the air conditioner. Due to the unbalance of the refrigerant, the temperature of the coil first decreases and then increases, and the air temperature of the indoor unit fluctuates greatly, resulting in poor user comfort.

By performing the opening action of the electronic expansion valve in the order of the target indoor unit gears from high to low, and performing the closing action of the electronic expansion valve in the order of the target indoor unit gears from low to high, the operation of the multi-unit air conditioner is improved. When the current set wind speed input by the user is high, it usually indicates that the user has a large demand for air supply. By preferentially opening the electronic expansion valve of the high-grade indoor unit, and preferentially closing the electronic expansion valve of the low-grade indoor unit, It avoids the liquid backflow of the compressor caused by insufficient evaporation of the liquid refrigerant, and ensures the reliability of the compressor operation.

Step b, when there are two or more second target indoor units in the target indoor unit, determine the opening sequence and/or closing sequence of the electronic expansion valve corresponding to each second target indoor unit based on the indoor temperature difference and the capacity of the indoor unit .

The currently set wind speed of each second target indoor unit is the same. When the above target indoor units include two or more second target indoor units with the same currently set air range, the currently set air range may be the same based on the indoor temperature difference and indoor unit capacity of each second target indoor unit. The second target indoor unit is further sorted.

The opening sequence and/or closing sequence of the electronic expansion valve corresponding to each second target indoor unit is determined based on the size of the indoor temperature difference corresponding to each second target indoor unit. Wherein, the opening sequence of the electronic expansion valve corresponding to the second target indoor unit is obtained by sorting the indoor temperature difference of each second target indoor unit in descending order, and the closing sequence of the electronic expansion valve corresponding to the second target indoor unit is given by The indoor temperature difference of each second target indoor unit is obtained in ascending order.

The above-mentioned second target indoor units are sorted according to the order of indoor temperature difference from high to low, and the obtained sorting result is used as the opening sequence of the electronic expansion valve corresponding to each second target indoor unit. The above-mentioned second target indoor units are sorted according to the order of indoor temperature difference from low to high, and the obtained sorting result is used as the closing order of the electronic expansion valve corresponding to each second target indoor unit.

By sorting the opening sequence and closing sequence of the electronic expansion valve based on the indoor temperature difference when the currently set air gears are the same, the fluctuation of the outlet air temperature of the multi-connected air conditioner can be avoided. Electronic expansion valve, which preferentially closes the electronic expansion valve corresponding to the indoor unit with a smaller indoor temperature difference to meet the user's temperature demand and improve the user's comfortable experience.

When there are two or more third target indoor units in the second target indoor unit, determine the opening sequence and sequence of the electronic expansion valve corresponding to each third target indoor unit based on the capacity of each third target indoor unit / or close the sequence. Among them, the indoor temperature difference of each third target indoor unit is the same, the opening order of the electronic expansion valve corresponding to the third target indoor unit is obtained by sorting the indoor unit capacity of each third target indoor unit according to the order from small to large, and the third target indoor unit The closing order of the electronic expansion valve corresponding to the indoor unit is obtained by sorting the indoor unit capacity of each third target indoor unit in descending order.

When two or more third target indoor units with the same indoor temperature difference are included in the above-mentioned second target indoor units, based on the indoor unit capacity of each third target indoor unit Sort further. The above-mentioned third target indoor units are sorted according to the indoor unit capacity in descending order, and the obtained sorting result is used as the opening sequence of the electronic expansion valve corresponding to each third target indoor unit. The above third target indoor units are sorted according to the indoor unit capacity in descending order, and the obtained sorting result is used as the closing sequence of the electronic expansion valve corresponding to each third target indoor unit.

Since the indoor unit with a small capacity has a relatively small impact on the indoor unit that is turned on, the fluctuation of the air conditioning system is small. When the indoor temperature difference is the same, the electronic expansion valve corresponding to the indoor unit with a smaller capacity is preferentially opened, and the smaller capacity is preferentially closed. The electronic expansion valve corresponding to the large-capacity indoor unit can reduce the fluctuation of the air-conditioning system and improve the stability of the multi-connected air-conditioning operation.

In order to improve the reliability of the control of the multi-connected air conditioner indoor units, the method provided in this embodiment further includes: when there are two or more fourth target indoor units in the third target indoor unit, based on each fourth target indoor unit The communication address of the unit determines the opening sequence of the electronic expansion valve corresponding to each fourth target indoor unit. The indoor unit capacities of the above-mentioned fourth target indoor units are the same.

When there are two or more fourth target indoor units with the same indoor unit capacity in the third target indoor unit, that is, the currently set wind profile, indoor temperature difference and indoor unit capacity of each fourth target indoor unit are the same, based on The communication address of each fourth target indoor unit is used to further sort each fourth target indoor unit with the same indoor unit capacity. According to the current indoor unit address (communication ID) or indoor unit number, open the electronic expansion valve corresponding to each fourth target indoor unit in sequence.

By opening the electronic expansion valve corresponding to each fourth target indoor unit in turn according to the communication address of the indoor unit when the current set air profile, indoor temperature difference and capacity of the indoor unit are all the same, the electronic expansion of multiple indoor units can be avoided. The synchronous action of the valve causes the unstable operation of the air conditioning system, reduces the temperature fluctuation of the coil, and improves the comfort of the air conditioner.

Obtain the running time of each fourth target indoor unit, and determine the closing sequence of the electronic expansion valve corresponding to each fourth target indoor unit based on the running time. The communication address determines the closing sequence of the electronic expansion valve corresponding to each fourth target indoor unit.

When there are multiple electronic expansion valves that need to be closed in the preset period, by detecting the opening time and closing time of the electronic expansion valve of each indoor unit, the running time of each fourth target indoor unit is calculated, and the running time is calculated from high to high. The lowest order is sorted, the electronic expansion valve of the indoor unit with a longer running time is closed first, and the electronic expansion valve of the indoor unit with a short running time is closed later. Since the indoor unit has been running for a period of time, the heat exchanger is prone to condensation. Therefore, the electronic expansion valve of the indoor unit that has been running for a long time is preferentially closed, which can reduce condensation and improve the stability of the operation of the multi-unit air conditioner.

When there are two or more fifth target indoor units with the same running time in the fourth target indoor unit, based on the communication address of each fifth target indoor unit, further processing is performed for each fifth target indoor unit with the same indoor unit capacity. sort. According to the current indoor unit address (communication ID) or indoor unit number, close the electronic expansion valve corresponding to each fifth target indoor unit in sequence.

In a specific embodiment, in the above-mentioned opening sequence and closing sequence of the electronic expansion valve, the time interval for opening or closing the electronic expansion valve of each indoor unit is t2 (preferably 0-10 seconds), so as to avoid opening or closing at the same time. Shutting down causes unstable system operation. The above description of the sequence of the indoor unit only affects the opening or closing control of the electronic expansion valve of the indoor unit, and does not affect the control sequence of the motor, air guide door and other components of the indoor unit.

In order to further improve the user experience, the method provided in this embodiment further includes: when the variation of the number of units is greater than the third number, controlling the opening of the electronic expansion valve corresponding to each target indoor unit based on the preset number of operations, the opening sequence and/or the closing sequence and/or off. The above-mentioned third number is greater than the first number. When a large number of indoor units are turned on or off at the same time, in order to reduce the waiting time for turning on or off For example, the number of operations may be 2 or 3, and the value range of the third number may be any value from 5 to 10.

For example, when opening the electronic expansion valves of multiple indoor units in sequence, the first and second electronic expansion valves can be opened first according to the above opening sequence, and the third and fourth electronic expansion valves can be opened after an interval of 2 seconds. The expansion valve is opened, and so on, until the electronic expansion valve of the indoor unit that is turned on by the user within the preset period is opened.

The indoor unit control method for the above-mentioned multi-connected air conditioner provided in this embodiment can prevent electronic The simultaneous opening of the expansion valve will cause fluctuations in system parameters, which will affect the running indoor unit, reduce the fluctuation of the outlet air temperature caused by the switching of the running indoor unit, avoid the sudden change of heat and cold, and improve the cooling comfort.

Embodiment 2:

Corresponding to the indoor unit control method of the multi-connected air conditioner provided in the first embodiment, the embodiment of the present invention provides an example of applying the indoor unit control method of the multi-connected air conditioner to control the electronic expansion valve of the multi-connected air conditioner. Refer to the following steps 1) to 6) to execute:

Step 1): when it is detected that the indoor unit capacity of the multi-connected air conditioner changes, the running state of the multi-connected air conditioner is detected.

The operating state of the multi-connected air conditioners includes the total number and capacity of indoor units, the number and capacity of indoor units currently in operation, and the current set wind speed of each indoor unit.

Referring to the schematic structural diagram of the multi-connected air conditioner shown in FIG. 2, the multi-connected air conditioner includes a plurality of indoor units 21-2i and a plurality of electronic expansion valves EEV1-EEVi, and each indoor unit is provided with a corresponding electronic expansion valve. When the indoor unit 2i is turned on, the corresponding electronic expansion valve EEVi is opened to allow the refrigerant to enter the indoor unit. By controlling the opening of the electronic expansion valve, the refrigerant flow into the indoor unit can be controlled. The timing starts from the opening time of the electronic expansion valve of the indoor unit, and the startup time of each indoor unit is recorded. When the electronic expansion valve is closed to the minimum opening, the timing is reset to zero, and the timing is restarted when the electronic expansion valve is opened again. The reset of the electronic expansion valve Actions are not timed.

Step 2): Detect the current set temperature and ambient temperature of each indoor unit, and calculate the indoor temperature difference of each indoor unit based on the current set temperature and the ambient temperature.

As shown in Figure 2, each indoor unit is provided with a temperature sensor, each temperature sensor is used to detect the ambient temperature Ta(1) ~ Ta(i) in the room where each indoor unit is located, and obtain the current setting input by the user in each indoor unit For the temperature Tset(i), calculate the indoor temperature difference ΔT(i)=Ta(i)-Tset(i) in the room where each indoor unit is located, where i=1, 2, 3….

Step 3): Calculate the indoor unit capacity change rate ΔQ of the multi-connected air conditioner, ΔQ=(Qc(t)-Qc(t-L))/Qc(t-L).

Wherein, Qc(t) is the total capacity of the indoor unit detected at the current time, Qc(t-L) is the total capacity of the indoor unit detected before the L time, and L is the preset period.

Step 4): Calculate the variation ΔN of the number of multi-connected air conditioner indoor units, ΔN=Nc(t)-Nc(t-L).

Among them, Nc(t) is the total number of indoor units in the running state detected at the current moment, and Nc(t-L) is the total number of indoor units in the running state detected before the L time.

Step 5): When the multi-connected air conditioner satisfies ΔQ≥ζ (ζ is preferably 30-50%) and ΔN≥2, it is judged that the air conditioner has increased the running indoor unit capacity at this time, and the number of newly started units is greater than or equal to 2, and the indoor unit capacity is The changes are large, and the newly added indoor units need to be sorted.

Detects the current set air profile of the newly added indoor unit, sorts the indoor units according to the level of the current set air profile, the indoor unit with a high wind profile has a high priority, and the indoor unit with a low wind profile has a low priority. The electronic expansion valve performs the opening action according to the priority order of the indoor unit. Because the indoor unit with a high wind gear can ensure sufficient air volume, the liquid refrigerant flowing through the heat exchanger can absorb heat and become a gaseous refrigerant, and the indoor unit with a low wind gear has a small air volume. If the liquid refrigerant evaporates insufficiently, it is easy to cause the compressor Liquid back.

Detect the indoor temperature difference of the indoor unit, indoor temperature difference = ambient temperature Ta - current set temperature Tset, the priority of the indoor unit with a large indoor temperature difference is high, and the priority of the indoor unit with a small indoor temperature difference is low. Because the large indoor fixed temperature difference indicates that the cooling demand in the room is large, the priority opening of the expansion valve can reduce the waiting time and make the indoor temperature difference quickly drop to a reasonable range.

Detect the capacity of the newly added indoor unit, and set the power-on sequence according to the capacity. The indoor unit with a small capacity has a high priority, and the indoor unit with a large capacity has a low priority. Because the indoor unit with small capacity has relatively little impact on the existing indoor unit, the system pressure fluctuation is small. Thereby, the system parameter changes caused by the change of the boot capacity are reduced.

If the detection conditions of the above indoor units are all the same, the newly added indoor units will be automatically sorted, for example, according to the current indoor unit address (indoor unit communication ID) sequence, and then the start-up actions (electronic expansion valve open) are performed in sequence; The opening time interval of the electronic expansion valve is t1 (preferably 0 to 10 seconds) to avoid unstable system operation caused by simultaneous opening.

If ΔN≥a is detected (a is preferably 5 to 10), in order to reduce the waiting time for startup, the number of simultaneous startups can be increased. For example, two indoor units with priority 1 and 2 are turned on at the same time, and then priority 3 And the indoor unit of 4 is turned on at the same time, and so on.

Step 6): When the multi-connected air conditioner satisfies ΔQ≤-ζ (ζ is preferably 30-50%) and ΔN≥2, it is judged that the air conditioner reduces the capacity of the indoor units in operation at this time, and the number of indoor units that need to be turned off is greater than or equal to 2, At this time, the capacity of the indoor unit changes greatly, and it is necessary to sequence the indoor units before performing the closing action of the expansion valve.

Detects the current set air gear of the indoor unit that needs to be turned off, sorts the indoor units according to the level of the currently set air gear, the indoor unit with a low wind gear has a higher priority, and the indoor unit with a high wind gear has a low priority , the electronic expansion valve performs the closing action according to the priority order of the indoor unit. Because the indoor unit with a high wind gear can ensure sufficient air volume, the liquid refrigerant flowing through the heat exchanger can absorb heat and become a gaseous refrigerant, and the indoor unit with a low wind gear has a small air volume. If the liquid refrigerant evaporates insufficiently, it is easy to cause the compressor Liquid back.

Detect the indoor temperature difference of the indoor unit, indoor temperature difference = ambient temperature Ta - current set temperature Tset, the priority of the indoor unit with a smaller indoor temperature difference is high, and the priority of the indoor unit with a large indoor temperature difference is low. Because the indoor temperature difference is small, the temperature in the room is close to the current set temperature, and the cooling demand in the room is small. The electronic expansion valve of the indoor unit can be closed first. The indoor temperature difference is large. It can ensure sufficient evaporation of the refrigerant.

Detect the capacity of the indoor unit that needs to be shut down, and set the power-on sequence according to the capacity. The indoor unit with a large capacity has a high priority, and the indoor unit with a small capacity has a low priority. Because the large-capacity indoor unit has a relatively large impact on the running indoor unit, resulting in large system pressure fluctuations, on the contrary, the small-capacity indoor unit shutting down has less impact on the running indoor unit. When multiple indoor units need to be shut down, the electronic expansion valve of the large-capacity indoor unit is closed first, and then the electronic expansion valve of the small-capacity indoor unit is closed, which can reduce the influence of the shutdown action on the system parameters.

Detect the running time of the indoor unit that needs to be turned off. The indoor unit with a long running time has a high priority, and the electronic expansion valve is closed first; the indoor unit with a short running time has a low priority, and the electronic expansion valve is closed later; The heater is prone to condensation, and closing the electronic expansion valve first can reduce condensation.

If the detection conditions of the above indoor units are all the same, the newly added indoor units will be automatically sequenced, for example, according to the current indoor unit address (indoor unit communication ID) sequence, and then the closing action of the electronic expansion valve will be executed in sequence; The time interval for closing the expansion valve is t2 (preferably 0 to 10 seconds) to avoid unstable system operation caused by simultaneous closing.

If ΔN≥a is detected (a is preferably 5 to 10), in order to reduce the shutdown waiting time, the number of simultaneous shutdowns can be increased. For example, two indoor units with priority 1 and 2 are turned off at the same time, and then priority 3 And the indoor unit of 4 is turned off at the same time, and so on. The above description of the sequence of indoor units only affects the opening or closing control of the electronic expansion valve of the indoor unit, and does not affect the control sequence of components such as the motor and air guide of the indoor unit. The above-mentioned shutdown of the indoor unit includes the electronic expansion valve control of shutting down the indoor unit when it reaches the temperature or turning it on when it reaches the temperature.

When some indoor units are turned on or off, it is detected that the above sorting conditions are not met, for example, the capacity change rate - ζ < ΔQ < ζ, or the change in the number of indoor units ΔN < 2, then the electronic expansion valve of the indoor unit will not be automatically opened or closed. sort.

Embodiment three:

Corresponding to the indoor unit control method for a multi-connected air conditioner provided in the first embodiment, the embodiment of the present invention provides an indoor unit control method for a multi-connected air conditioner, and the device can be applied to a multi-connected air conditioner, as shown in FIG. 3 . The schematic structural diagram of the indoor unit control device of the multi-connected air conditioner shown in the figure, the device includes the following modules:

The obtaining module 31 is configured to obtain the capacity change amount and the number change amount of the indoor units of the multi-connected air conditioner within a preset period.

The judging module 32 is used for judging whether each electronic expansion valve corresponding to the indoor unit satisfies the sequence control condition based on the capacity change and the number change; wherein the sequence control condition is related to the number of target indoor units turned on or off in a preset period.

The control module 33 is used to determine the opening sequence and/or closing sequence of the electronic expansion valve corresponding to each target indoor unit when the multi-connected air conditioner satisfies the sequence control condition, and control the corresponding electronic expansion valve of each target indoor unit based on the opening sequence and/or the closing sequence. The electronic expansion valve opens and/or closes.

The indoor unit control device for the multi-connected air conditioner provided in this embodiment determines whether the multi-connected air conditioner satisfies the sequence control condition by determining whether the multi-unit air conditioner satisfies the sequence control condition based on the change in the capacity of the indoor units and the change in the number of units, and for each target indoor unit that satisfies the sequence control condition The connected electronic expansion valve is opened or closed in turn according to the opening sequence or closing sequence, which can avoid the problem of unbalanced refrigerant flow in the pipeline to a certain extent, reduce the fluctuation degree of the multi-unit air conditioner, and improve the multi-unit air conditioner. The stability of operation improves the user's comfort experience.

In one embodiment, the above obtaining module 31 is further configured to obtain an indoor unit power-on command or an indoor unit power-off command input by a user within a preset period; determine the capacity change of the multi-connected air conditioner and Variation in the number of units.

In one embodiment, the above judgment module 32 is further configured to determine the capacity change rate of the indoor unit in the preset period based on the capacity change amount; when the absolute value of the capacity change rate is greater than or equal to the first change rate, and the number of units changes When the absolute value is greater than or equal to the first number, it is determined that the multi-connected air conditioner satisfies the sequence control condition.

In one embodiment, the above-mentioned control module 33 is further configured to obtain the current set wind profile, indoor unit capacity and indoor temperature difference of each target indoor unit; wherein, the indoor temperature difference is the ambient temperature of the target indoor unit and the current set temperature Rank the currently set air profile, indoor temperature difference and indoor unit capacity by prioritization to obtain a priority ranking result; determine the opening sequence and/or closing of the electronic expansion valve corresponding to each target indoor unit based on the priority ranking result order.

In one embodiment, the above-mentioned control module 33 is further configured to determine the opening sequence and/or closing sequence of the electronic expansion valve corresponding to each target indoor unit based on the gear level of each currently set wind gear; wherein the opening sequence is determined by The currently set wind gears of each target indoor unit are sorted in the order from high gear to low gear, and the closing order is obtained from the current setting wind gears of each target indoor unit in the order from low gear to high gear; When there are two or more second target indoor units, the opening sequence and/or closing sequence of the electronic expansion valve corresponding to each second target indoor unit is determined based on the indoor temperature difference and the capacity of the indoor unit; The current setting of the fan is the same.

In an embodiment, the above-mentioned control module 33 is further configured to determine the opening sequence and/or closing sequence of the electronic expansion valve corresponding to each second target indoor unit based on the size of the indoor temperature difference corresponding to each second target indoor unit; wherein, The opening sequence of the electronic expansion valve corresponding to the second target indoor unit is obtained by sorting the indoor temperature difference of each second target indoor unit in descending order, and the closing sequence of the electronic expansion valve corresponding to the second target indoor unit is determined by each second target indoor unit The indoor temperature difference of the target indoor unit is sorted in descending order; when there are two or more third target indoor units in the second target indoor unit, the capacity of each third target indoor unit is based on the indoor unit capacity of each third target indoor unit. Determine the opening sequence and/or closing sequence of the electronic expansion valve corresponding to each third target indoor unit; wherein, the indoor temperature difference of each third target indoor unit is the same, and the opening sequence of the electronic expansion valve corresponding to the third target indoor unit is determined by each third target indoor unit. The indoor unit capacities of the three target indoor units are sorted in descending order, and the closing order of the electronic expansion valve corresponding to the third target indoor unit is sorted by the indoor unit capacity of each third target indoor unit in descending order get.

In one embodiment, the above device further includes:

The first determination module is configured to determine the electronic expansion corresponding to each fourth target indoor unit based on the communication address of each fourth target indoor unit when there are two or more fourth target indoor units in the third target indoor unit valve opening sequence; wherein, the capacity of the indoor units of each fourth target indoor unit is the same; and/or, obtaining the running time of each fourth target indoor unit, and determining the corresponding electronic expansion valve of each fourth target indoor unit based on the running time Closing sequence, when the running time of the fourth target indoor units is the same, the closing sequence of the electronic expansion valve corresponding to each fourth target indoor unit is determined based on the communication address of each fourth target indoor unit.

The second determination module is configured to control the electronic expansion valve corresponding to each target indoor unit to open and/or close based on the preset operation quantity, opening sequence and/or closing sequence when the variation of the number of units is greater than the third quantity.

The indoor unit control device of the multi-connected air conditioner provided in this embodiment can automatically determine the opening sequence or closing sequence of a plurality of electronic expansion valves based on the current set wind speed of the indoor unit, the indoor temperature difference, and the capacity of the indoor unit, thereby preventing electronic The simultaneous opening of the expansion valve will cause fluctuations in system parameters, which will affect the running indoor unit, reduce the fluctuation of the outlet air temperature caused by the switching of the running indoor unit, avoid the sudden change of heat and cold, and improve the cooling comfort.

Embodiment 4:

Corresponding to the indoor unit control method for a multi-connected air conditioner provided in the first embodiment, this embodiment provides an air conditioner, the air conditioner includes a computer-readable storage medium storing a computer program and a processor, and the computer program is processed When the device reads and runs, the indoor unit control method of the multi-connected air conditioner provided in the first embodiment above is realized.

Embodiment 5:

This embodiment also provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, each process of the above-mentioned embodiment of the indoor unit control method for a multi-connected air conditioner is implemented, and The same technical effect can be achieved, and in order to avoid repetition, details are not repeated here. The computer-readable storage medium is, for example, a read-only memory (Read-Only Memory, ROM for short), a random access memory (Random Access Memory, RAM for short), a magnetic disk or an optical disk, and the like.

Of course, those skilled in the art can understand that all or part of the process in the method of the above-mentioned embodiments can be completed by instructing the control device through a computer level, and the program can be stored in a computer-readable storage medium, so the When the program is executed, it may include the processes of the above-mentioned method embodiments, and the storage medium may be a memory, a magnetic disk, an optical disk, or the like.

Although the present invention is disclosed above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be based on the scope defined by the claims.

Finally, it should also be noted that in this document, relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply these entities or that there is any such actual relationship or sequence between operations. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device comprising a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element.

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments can be referred to each other. For the indoor unit control device and the air conditioner of the multi-connected air conditioner disclosed in the embodiment, since it corresponds to the indoor unit control method of the multi-connected air conditioner disclosed in the embodiment, the description is relatively simple. Part of the description will do.

The above description of the disclosed embodiments enables any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Although the present invention is disclosed above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be based on the scope defined by the claims.

Claims (9)

1. A control method for an indoor unit of a multi-connected air conditioner is characterized by comprising the following steps:

acquiring the capacity variation and the number variation of indoor units of the multi-connected air conditioner in a preset period;

judging whether each electronic expansion valve corresponding to the indoor unit meets the sequencing control condition or not based on the capacity variation and the number variation; the sequencing control condition is related to the number of target indoor units which are turned on or turned off in a preset period;

if yes, determining the opening sequence and/or the closing sequence of the electronic expansion valve corresponding to each target indoor unit, and controlling the opening and/or the closing of the electronic expansion valve corresponding to each target indoor unit based on the opening sequence and/or the closing sequence;

the step of determining whether each electronic expansion valve corresponding to the indoor unit satisfies a sorting control condition based on the capacity variation and the number variation includes:

determining the capacity change rate of the indoor unit in the preset period based on the capacity change amount;

when the absolute value of the capacity change rate is larger than or equal to a first change rate and the absolute value of the number change amount is larger than or equal to a first number, determining that the multi-connected air conditioner meets the sequencing control condition;

the step of determining the opening sequence and/or the closing sequence of the electronic expansion valve corresponding to each target indoor unit comprises the following steps: acquiring a current set wind shield, indoor unit capacity and indoor temperature difference of each target indoor unit; the indoor temperature difference is the difference value between the ambient temperature of the target indoor unit and the current set temperature;

carrying out priority sequencing on the three parameters of the current set wind shield, the indoor temperature difference and the indoor unit capacity to obtain a priority sequencing result;

determining the opening sequence and/or the closing sequence of the electronic expansion valve corresponding to each target indoor unit based on the priority ranking result; the current setting air gear, the indoor temperature difference and the indoor unit capacity are subjected to a priority sorting mode, and the current setting air gear, the indoor temperature difference and the indoor unit capacity can be set according to the requirements of users on the multi-connected air conditioner.

2. The method as claimed in claim 1, wherein the step of obtaining the capacity variation and the number variation of the indoor units of the multi-type air conditioner in a preset period comprises:

acquiring an indoor unit power-on instruction or an indoor unit power-off instruction input by a user in a preset period;

and determining the capacity variation and the number variation of the multi-connected air conditioners according to the starting instruction or the shutdown instruction.

3. The indoor unit control method of a multi-split air conditioner according to claim 1, wherein the priority ranking result is the current setting air level, the indoor temperature difference, and the indoor unit capacity in turn; the step of determining the opening order and/or the closing order of the electronic expansion valves corresponding to the target indoor units based on the priority ranking results comprises the following steps:

determining the opening sequence and/or the closing sequence of the electronic expansion valve corresponding to each target indoor unit based on the gear level of each current set wind shield; the starting sequence is obtained by sequencing the current set wind level of each target indoor unit according to the sequence from a high gear to a low gear, and the closing sequence is obtained by sequencing the current set wind level of each target indoor unit according to the sequence from a low gear to a high gear;

when two or more than two second target indoor units exist in the target indoor units, determining the opening sequence and/or closing sequence of the electronic expansion valve corresponding to each second target indoor unit based on the indoor temperature difference and the indoor unit capacity; and the current set wind grades of the second target indoor units are the same.

4. The indoor unit control method of a multi-type air conditioner according to claim 3, wherein the step of determining the opening order and/or the closing order of the electronic expansion valves corresponding to the second target indoor units based on the indoor temperature difference and the indoor unit capacity includes:

determining the opening sequence and/or the closing sequence of the electronic expansion valves corresponding to the second target indoor units based on the indoor temperature difference corresponding to the second target indoor units; the opening sequence of the electronic expansion valves corresponding to the second target indoor units is obtained by sequencing the indoor temperature difference of each second target indoor unit from large to small, and the closing sequence of the electronic expansion valves corresponding to the second target indoor units is obtained by sequencing the indoor temperature difference of each second target indoor unit from small to large;

when two or more than two third target indoor units exist in the second target indoor units, determining the opening sequence and/or closing sequence of the electronic expansion valve corresponding to each third target indoor unit based on the indoor unit capacity of each third target indoor unit; the indoor temperature difference of each third target indoor unit is the same, the opening sequence of the electronic expansion valve corresponding to each third target indoor unit is obtained by sequencing the indoor unit capacity of each third target indoor unit from small to large, and the closing sequence of the electronic expansion valve corresponding to each third target indoor unit is obtained by sequencing the indoor unit capacity of each third target indoor unit from large to small.

5. The indoor unit control method of a multi-type air conditioner according to claim 4, further comprising:

when two or more than two fourth target indoor units exist in the third target indoor units, determining the opening sequence of the electronic expansion valve corresponding to each fourth target indoor unit based on the communication address of each fourth target indoor unit; the indoor unit capacity of each fourth target indoor unit is the same;

and/or the presence of a gas in the gas,

and acquiring the running time of each fourth target indoor unit, determining the closing sequence of the electronic expansion valve corresponding to each fourth target indoor unit based on the running time, and determining the closing sequence of the electronic expansion valve corresponding to each fourth target indoor unit based on the communication address of each fourth target indoor unit when the running times of the fourth target indoor units are the same.

6. The indoor unit control method of a multi-type air conditioner according to claim 1, further comprising:

and when the number of the variable quantities is larger than a third number, controlling the opening and/or closing of the electronic expansion valve corresponding to each target indoor unit based on a preset operation number, the opening sequence and/or the closing sequence.

7. An indoor unit control device for a multi-split air conditioner, comprising:

the acquisition module is used for acquiring the capacity variation and the number variation of the indoor units of the multi-connected air conditioner in a preset period;

the judging module is used for judging whether each electronic expansion valve corresponding to the indoor unit meets the sequencing control condition or not based on the capacity variation and the number variation; the sequencing control condition is related to the number of target indoor units which are turned on or turned off in a preset period; determining the capacity change rate of the indoor unit in the preset period based on the capacity change amount; when the absolute value of the capacity change rate is larger than or equal to a first change rate and the absolute value of the number change amount is larger than or equal to a first number, determining that the multi-connected air conditioner meets the sequencing control condition;

the control module is used for determining the opening sequence and/or the closing sequence of the electronic expansion valves corresponding to the target indoor units when the multi-connected air conditioner meets the sequencing control condition, and controlling the opening and/or the closing of the electronic expansion valves corresponding to the target indoor units based on the opening sequence and/or the closing sequence;

the control module is used for acquiring the current set wind level, the indoor unit capacity and the indoor temperature difference of each target indoor unit; the indoor temperature difference is the difference value between the environmental temperature of the target indoor unit and the current set temperature; carrying out priority sequencing on the three parameters of the current set wind shield, the indoor temperature difference and the indoor unit capacity to obtain a priority sequencing result; determining the opening sequence and/or closing sequence of the electronic expansion valve corresponding to each target indoor unit based on the priority ranking result; the current setting air level, the indoor temperature difference and the indoor unit capacity are subjected to priority sorting, and the mode can be set according to the requirement of a user on the multi-connected air conditioner.

8. An air conditioner comprising a computer readable storage medium storing a computer program and a processor, the computer program being read and executed by the processor to implement the method of any one of claims 1-6.

9. A computer-readable storage medium, characterized in that it stores a computer program which, when read and executed by a processor, implements the method according to any one of claims 1-6.

Images