CN114576798B

CN114576798B - Multi-split air conditioning system and control method thereof

Info

Publication number: CN114576798B
Application number: CN202210319580.5A
Authority: CN
Inventors: 周洋; 王善云; 屈乐建
Original assignee: Qingdao Hisense Hitachi Air Conditioning System Co Ltd
Current assignee: Qingdao Hisense Hitachi Air Conditioning System Co Ltd
Priority date: 2022-03-29
Filing date: 2022-03-29
Publication date: 2023-08-08
Anticipated expiration: 2042-03-29
Also published as: CN114576798A; CN117091206A

Abstract

The embodiment of the application discloses a multi-split air conditioning system and a control method thereof, which relate to the technical field of air conditioning and can improve the pairing detection efficiency of an indoor unit and an electronic expansion valve in the multi-split air conditioning system. The air conditioning system includes: an outdoor unit; an electronic expansion valve is arranged between each indoor unit and the outdoor unit, and each indoor unit comprises a first temperature sensor for detecting the temperature of the indoor unit; a plurality of electronic expansion valves; a controller configured to: starting the outdoor unit, each indoor unit and each electronic expansion valve to enable each indoor unit to operate in a refrigeration mode; closing the target electronic expansion valve; after a second preset time period, collecting a second temperature value of each indoor unit at a second moment, and selecting the indoor unit with the largest second temperature value as a target indoor unit; and if the difference value of the second temperature value minus the first temperature average value of the target indoor unit is larger than the third temperature threshold value, determining that the target indoor unit is paired with the target electronic expansion valve.

Description

Multi-split air conditioning system and control method thereof

Technical Field

The application relates to the technical field of air conditioners, in particular to a multi-split air conditioning system and a control method thereof.

Background

With the development of economy and society, air conditioners are increasingly used in various places such as entertainment, home, work and the like. When air conditioners are needed to be used in a plurality of small areas in the same area, a multi-split air conditioning system is often adopted to realize the regulation and control of the room temperature of the multiple areas in consideration of the saving of electric energy.

In actual installation and use, the situation that the pairing of the indoor units and the electronic expansion valves is wrong may occur in the multi-split air conditioning system, generally, each indoor unit is manually debugged, and the addresses of the relevant indoor units or the electronic expansion valves are independently changed after the debugging is completed. The debugging mode makes the workload of installation and debugging personnel larger and the work efficiency of online debugging lower.

Disclosure of Invention

The embodiment of the application provides a multi-split air conditioning system and a control method thereof, which are used for improving the pairing detection efficiency of an electronic expansion valve and an indoor unit in the air conditioning system.

In a first aspect, an embodiment of the present application provides a multi-split air conditioning system, the system includes: an outdoor unit; an electronic expansion valve is arranged between each indoor unit and the outdoor unit, and each indoor unit comprises a first temperature sensor for detecting the temperature of the indoor unit; a plurality of electronic expansion valves for adjusting a supply amount of the refrigerant; a controller configured to: starting the outdoor unit, each indoor unit and each electronic expansion valve to enable each indoor unit to operate in a refrigeration mode; closing the target electronic expansion valve; after a second preset time period, collecting a second temperature value of each indoor unit at a second moment, and selecting the indoor unit with the largest second temperature value as a target indoor unit; and if the difference value of the second temperature value of the target indoor unit minus the first temperature average value is larger than the third temperature threshold value, determining that the target indoor unit is paired with the target electronic expansion valve, wherein the first temperature average value is determined according to the second temperature value of each indoor unit.

The technical scheme provided by the embodiment of the application at least brings the following beneficial effects: in the cooling mode, after the outdoor unit, each indoor unit and each electronic expansion valve are started for a period of time, the electronic expansion valve to be detected is closed, and the indoor unit connected with the electronic expansion valve lacks refrigerant, so that the cooling effect is reduced, and the temperature value of the indoor unit is obviously higher than that of other indoor units. In this way, the indoor unit with the highest temperature is taken as the target indoor unit, and if the second temperature value of the target indoor unit is greatly different from the first temperature average value of the indoor unit, the target indoor unit is considered to be obviously influenced by the electronic expansion valve, so that the indoor unit connected with the electronic expansion valve to be detected can be determined. Based on the detection method, the indoor unit matched with the electronic expansion valve to be detected can be automatically detected through the air conditioning system, so that the detection efficiency is improved, and the labor is saved.

In some embodiments, the outdoor unit includes a second temperature sensor for detecting a temperature of the outdoor unit, and the controller is specifically configured to: acquiring a temperature value of an outdoor unit; when the temperature value of the outdoor unit is greater than or equal to the first temperature threshold value, the outdoor unit, each indoor unit and each electronic expansion valve are started, so that each indoor unit operates in a refrigeration mode.

It should be appreciated that when the temperature value of the outdoor unit is greater than or equal to the first temperature threshold, the outdoor temperature is higher and the weather is hotter. On the one hand, when the pairing situation of the indoor units and the electronic expansion valve is detected, each indoor unit is controlled to operate in a refrigerating mode, so that the indoor temperature is reduced, the energy is fully utilized, and the user experience is improved while the pairing situation is detected. On the other hand, after the electronic expansion valve to be detected is closed later, the temperature of the indoor unit connected with the electronic expansion valve is obviously increased and is obviously higher than that of other indoor units. Therefore, a proper working mode can be selected according to the ambient temperature, so that the ambient interference is reduced, and the indoor unit connected with the electronic expansion valve to be detected is judged more accurately.

In some embodiments, the controller is specifically configured to: closing the target electronic expansion valve under the condition that the first preset condition is met; wherein the first preset condition includes one or more of the following: the difference between the maximum temperature value and the minimum temperature value in the first temperature value of each indoor unit at the first moment is smaller than the second temperature threshold value, and the first moment is positioned before the second moment; or the duration of the indoor unit operation refrigeration mode reaches the first preset duration.

It should be understood that the target electronic expansion valve is closed in order to compare the temperature conditions of each indoor unit after the target electronic expansion valve is closed. Therefore, before the target electronic expansion valve is closed, the indoor units are ensured to keep stable state at similar temperature. When the difference between the maximum temperature value and the minimum temperature value in the first temperature values of the indoor units is smaller than the second temperature threshold value, the temperature of the indoor units is close, the running condition is close, and the indoor units are in a stable working state. When the air conditioning system is operated for a first preset period of time, each indoor unit is in a stable working state, and the requirements can be considered to be met.

In some embodiments, the controller is further configured to: when the multi-split air conditioning system is in a refrigeration mode, acquiring temperature values of all indoor units in a starting state and temperature values of all indoor units not in the starting state; and when the temperature value of at least one indoor unit in the non-started state in the fifth preset time period is smaller than the sixth temperature threshold value and the temperature value of at least one indoor unit in the started state in the fifth preset time period is larger than the seventh temperature threshold value, sending out alarm information for prompting that the pairing errors exist between the indoor units and the electronic expansion valve.

It should be understood that, when the air conditioning system is in the refrigeration state, if there is at least one indoor unit in the non-powered on state in which the temperature value in the fifth preset duration is less than the sixth temperature threshold, it is indicated that the indoor unit in the non-powered on state is affected by the refrigerant, and the electronic expansion valve connected with the indoor unit in the non-powered on state is in the open state. At this time, if there is a situation that the temperature value of at least one indoor unit in the on state in the fifth preset duration is greater than the seventh temperature threshold, the indoor unit in the on state lacks refrigerant, and an electronic expansion valve connected with the indoor unit in the on state is in a closed state. Therefore, when the electronic expansion valve and the indoor unit address are in wrong pairing in the air conditioning system, the air conditioning system is controlled to give an alarm so as to remind a user to timely close the air conditioning system or correct the address.

In a second aspect, an embodiment of the present application further provides a multi-split air conditioning system, where the system includes: an outdoor unit; an electronic expansion valve is arranged between each indoor unit and the outdoor unit, and each indoor unit comprises a first temperature sensor for detecting the temperature of the indoor unit; a plurality of electronic expansion valves for adjusting a supply amount of the refrigerant; a controller configured to: starting the outdoor unit, each indoor unit and each electronic expansion valve to enable each indoor unit to operate in a heating mode; closing the target electronic expansion valve; after a fourth preset time period, collecting a fourth temperature value of each indoor unit at a fourth moment, and selecting the indoor unit with the smallest fourth temperature value as a target indoor unit; and if the difference value of the second temperature average value minus the fourth temperature value of the target indoor unit is larger than the fifth temperature threshold value, determining that the target indoor unit is paired with the target electronic expansion valve, wherein the second temperature average value is determined according to the fourth temperature value of each indoor unit.

The technical scheme provided by the embodiment of the application at least brings the following beneficial effects: after the outdoor unit, each indoor unit and each electronic expansion valve are started for a period of time, the electronic expansion valve to be detected is closed, the temperature difference of each indoor unit after the electronic expansion valve to be detected is compared, and the indoor units connected with the electronic expansion valve are lack of refrigerant, so that the heating effect is reduced. Therefore, the temperature value of the indoor unit connected to the electronic expansion valve is significantly lower than that of the other indoor units. In this way, the indoor unit with the lowest temperature is taken as the target indoor unit, and if the fourth temperature value of the target indoor unit and the second temperature average value of the indoor unit are greatly different, the target indoor unit is considered to be obviously influenced by the electronic expansion valve, so that the indoor unit connected with the electronic expansion valve to be detected can be determined. Based on this, can detect in the paired indoor set of the electronic expansion valve that waits to detect through air conditioning system automated inspection, improve detection efficiency, and saved the manpower.

In some embodiments, the controller is further configured to: acquiring a temperature value of an outdoor unit; when the temperature value of the outdoor unit is smaller than the first temperature threshold value, the outdoor unit, each indoor unit and each electronic expansion valve are started, so that each indoor unit operates in a heating mode.

It should be appreciated that when the temperature value of the outdoor unit is less than the first temperature threshold, the outdoor temperature is low and the weather is cold. On the one hand, when the pairing situation of the indoor units and the electronic expansion valve is detected, each indoor unit is controlled to operate in a heating mode, so that the indoor temperature is improved, the energy is fully utilized, and the user experience is improved while the pairing situation is detected. On the other hand, after the electronic expansion valve to be detected is closed later, the temperature of the indoor unit connected with the electronic expansion valve is obviously reduced and is obviously lower than that of other indoor units. Therefore, a proper working mode can be selected according to the ambient temperature, so that the ambient interference is reduced, and the indoor unit connected with the electronic expansion valve to be detected is judged more accurately.

In some embodiments, the controller is further configured to: closing the target electronic expansion valve under the condition that the second preset condition is met; wherein the second preset condition includes one or more of the following: the difference between the maximum temperature value and the minimum temperature value in the third temperature value of each indoor unit at the third moment is smaller than or equal to a fourth temperature threshold value, and the third moment is positioned before the fourth moment; or the duration of the indoor unit operation heating mode reaches a third preset duration.

It should be understood that the target electronic expansion valve is closed in order to compare the temperature conditions of each indoor unit after the target electronic expansion valve is closed. Therefore, before the target electronic expansion valve is closed, the indoor units are ensured to keep stable state at similar temperature. When the difference between the maximum temperature value and the minimum temperature value in the third temperature values of the indoor units is smaller than or equal to the fourth temperature threshold value, the temperature of the indoor units is close, the running condition is close, and the indoor units are in a stable working state. When the air conditioning system is operated for a third preset period of time, each indoor unit is in a stable working state, and the requirements can be considered to be met.

In a third aspect, an embodiment of the present application provides a control method of a multi-split air conditioning system, including: starting the outdoor unit, each indoor unit and each electronic expansion valve to enable each indoor unit to operate in a refrigeration mode; closing the target electronic expansion valve; after a second preset time period, collecting a second temperature value of each indoor unit at a second moment, and selecting the indoor unit with the largest second temperature value as a target indoor unit; and if the difference value of the second temperature value of the target indoor unit minus the first temperature average value is larger than the third temperature threshold value, determining that the target indoor unit is paired with the target electronic expansion valve, wherein the first temperature average value is determined according to the second temperature value of each indoor unit.

In some embodiments, the starting the outdoor unit, each indoor unit, and each electronic expansion valve to make each indoor unit operate in a cooling mode includes: acquiring a temperature value of an outdoor unit; when the temperature value of the outdoor unit is greater than or equal to the first temperature threshold value, the outdoor unit, each indoor unit and each electronic expansion valve are started, so that each indoor unit operates in a refrigeration mode.

In some embodiments, the closing target electronic expansion valve includes: closing the target electronic expansion valve under the condition that the first preset condition is met; wherein the first preset condition includes one or more of the following: the difference between the maximum temperature value and the minimum temperature value in the first temperature value of each indoor unit at the first moment is smaller than the second temperature threshold value, and the first moment is positioned before the second moment; or the duration of the indoor unit operation refrigeration mode reaches the first preset duration.

In some embodiments, the above method further comprises: when the multi-split air conditioning system is in a refrigeration mode, acquiring temperature values of all indoor units in a starting state and temperature values of all indoor units not in the starting state; and when the temperature value of at least one indoor unit in the non-started state in the fifth preset time period is smaller than the sixth temperature threshold value and the temperature value of at least one indoor unit in the started state in the fifth preset time period is larger than the seventh temperature threshold value, sending out alarm information for prompting that the pairing errors exist between the indoor units and the electronic expansion valve.

In a fourth aspect, an embodiment of the present application provides a control method of a multi-split air conditioning system, where the method includes: starting the outdoor unit, each indoor unit and each electronic expansion valve to enable each indoor unit to operate in a heating mode; closing the target electronic expansion valve; after a fourth preset time period, collecting a fourth temperature value of each indoor unit at a fourth moment, and selecting the indoor unit with the smallest fourth temperature value as a target indoor unit; and if the difference value of the second temperature average value minus the fourth temperature value of the target indoor unit is larger than the fifth temperature threshold value, determining that the target indoor unit is paired with the target electronic expansion valve, wherein the second temperature average value is determined according to the fourth temperature value of each indoor unit.

In some embodiments, the starting the outdoor unit, each indoor unit, and each electronic expansion valve to make each indoor unit operate in a heating mode includes: acquiring a temperature value of an outdoor unit; when the temperature value of the outdoor unit is smaller than the first temperature threshold value, the outdoor unit, each indoor unit and each electronic expansion valve are started, so that each indoor unit operates in a heating mode.

In some embodiments, the closing target electronic expansion valve includes: closing the target electronic expansion valve under the condition that the second preset condition is met; wherein the second preset condition includes one or more of the following: the difference between the maximum temperature value and the minimum temperature value in the third temperature value of each indoor unit at the third moment is smaller than or equal to a fourth temperature threshold value, and the third moment is positioned before the fourth moment; or the duration of the indoor unit operation heating mode reaches a third preset duration.

In a fifth aspect, a control device for a multi-split air conditioning system is provided, including: one or more processors; one or more memories; wherein the one or more memories are for storing computer program code comprising computer instructions which, when executed by the one or more processors, cause the controller to perform the methods provided in the third or fourth aspect and in a possible implementation.

In a sixth aspect, there is provided a computer readable storage medium comprising computer instructions which, when run on a computer, cause the computer to perform the method of the third or fourth aspect and possibly the implementation.

In a seventh aspect, there is provided a computer program product comprising computer instructions which, when run on a computer, cause the computer to perform the method provided in the third or fourth aspect and possible implementations described above.

It should be noted that the above-mentioned computer instructions may be stored in whole or in part on a computer-readable storage medium. The computer readable storage medium may be packaged together with the processor of the controller or may be packaged separately from the processor of the controller, which is not limited in this application.

The beneficial effects described in the second to seventh aspects of the present application may refer to the beneficial effect analysis of the first or second aspect, and are not described here again.

Drawings

The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate and do not limit the invention.

Fig. 1 is a schematic diagram illustrating a connection manner between an indoor unit and an electronic expansion valve of a multi-split air conditioning system according to some embodiments;

FIG. 2 is a schematic diagram of a multi-split air conditioning system according to some embodiments;

FIG. 3 is a second schematic diagram of a multi-split air conditioning system according to some embodiments;

fig. 4 is a schematic diagram of a refrigeration cycle of a multi-split air conditioning system according to some embodiments;

FIG. 5 is a schematic diagram of a controller according to some embodiments;

FIG. 6 is a schematic diagram illustrating interactions between a controller and a terminal device of a multi-split air conditioning system according to some embodiments;

FIG. 7 is a schematic diagram of a management page of a terminal device according to some embodiments;

FIG. 8 is a second schematic diagram of a management page of another terminal device according to some embodiments;

FIG. 9 is a flow chart illustrating a control method of a multi-split air conditioning system according to some embodiments;

FIG. 10 is a second flow chart of a control method of another multi-split air conditioning system according to some embodiments;

FIG. 11 is a second schematic interaction diagram of a controller and a terminal device of another multi-split air conditioning system according to some embodiments;

FIG. 12 is a third schematic diagram of interactions between a controller and a terminal device of yet another multi-split air conditioning system according to some embodiments;

fig. 13 is a third schematic view of a management page of a further terminal device according to some embodiments;

FIG. 14 is a flowchart illustrating a third method for controlling a multi-split air conditioning system according to some embodiments;

FIG. 15 is a flowchart illustrating a control method of a multi-split air conditioning system according to another embodiment;

FIG. 16 is a flowchart of a control method of a multi-split air conditioning system according to yet another embodiment;

fig. 17 is a schematic diagram of a hardware architecture of a controller according to some embodiments.

Detailed Description

The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present application, it should be noted that, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context. In addition, when describing a pipeline, the terms "connected" and "connected" as used herein have the meaning of conducting. The specific meaning is to be understood in conjunction with the context.

In the embodiments of the present application, words such as "exemplary" or "such as" are used to mean serving as examples, illustrations, or descriptions. Any embodiment or design described herein as "exemplary" or "for example" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.

As described in the background art, in real life, people often realize the regulation and control of multi-area room temperature through a multi-split air conditioning system. For some multi-split air conditioning systems, the multi-split air conditioning system comprises a plurality of indoor units, each indoor unit is located in a room, each electronic expansion valve connected with each indoor unit is located outside the room, and at this time, because the multi-split air conditioning system is provided with the plurality of indoor units, the situation that the indoor units and the electronic expansion valves are paired incorrectly can occur.

For example, fig. 1 shows a connection manner between an indoor unit and an electronic expansion valve. Referring to fig. 1, an indoor unit 1a is connected to an electronic expansion valve 1b through a gas-liquid pipe 1c, an indoor unit 2a is connected to an electronic expansion valve 3b through a gas-liquid pipe 2c, and an indoor unit 3a is connected to an electronic expansion valve 2b through a gas-liquid pipe 3 c. And the indoor unit 1a, the indoor unit 2a, the indoor unit 3a, the electronic expansion valve 1b, the electronic expansion valve 2b, and the electronic expansion valve 3b are all in communication connection with the controller (as indicated by the broken line connection in fig. 1). Pairing information recorded by the controller is shown in table 1. Wherein the address of the indoor unit 1a is 1a, the address of the indoor unit 2a is 2a, and the address of the indoor unit 3a is 3a; the address of the electronic expansion valve 1b is 1b, the address of the electronic expansion valve 2b is 2b, and the address of the electronic expansion valve 3b is 3b.

TABLE 1

Sequence number	Indoor unit address	Electronic expansion valve address
			1	1a	1b
2	2a	2b
			3	3a	3b

According to the pairing information shown in table 1, when the multi-split air conditioning system starts the indoor unit 1a, the controller starts the electronic expansion valve 1b according to the address information recorded in table 1, and referring to fig. 1, the indoor unit 1a and the electronic expansion valve 1b are normally connected through the gas-liquid pipe 1c, so that the indoor unit 1a normally works. When the indoor unit 2a needs to be opened, the controller opens the electronic expansion valve 2b according to the information recorded in table 1, referring to fig. 1, no gas-liquid pipe connection exists between the indoor unit 2a and the electronic expansion valve 2b, and at this time, the indoor unit 2a lacks refrigerant, so that the situation of poor heating or refrigerating effect occurs; in addition, when the electronic expansion valve 2b is opened, its corresponding indoor unit 3a is not opened, which results in that the refrigerant passing through the electronic expansion valve 2b returns to the compressor (not shown in fig. 1) without sufficient heat exchange, resulting in energy waste, and adversely affecting the reliability of the system, and damaging the life of the machine.

Therefore, when the multi-split air conditioning system is used, the pairing situation of the indoor unit and the electronic expansion valve is detected in time, and address correction is necessary when pairing is wrong.

Generally, the pairing condition of the indoor unit and the electronic expansion valve is detected manually. In the debugging process, each indoor unit is manually debugged, and the addresses of the relevant indoor units or the electronic expansion valves are required to be independently changed after the debugging is completed. The mode consumes more manpower, and when the indoor units are more, the workload of installation and debugging personnel is larger, and the debugging efficiency of the multi-split air conditioning system is lower.

In view of the above, the embodiments of the present application provide a multi-split air conditioning system and a control method thereof, where after an outdoor unit, each indoor unit, and each electronic expansion valve are started for a period of time, the electronic expansion valve to be detected is closed; after the electronic expansion valve to be detected is closed, comparing the temperature difference of each indoor unit, and further determining the indoor unit corresponding to the electronic expansion valve to be detected. It can be understood that after the electronic expansion valve to be detected is closed, the indoor unit connected with the electronic expansion valve may have a reduced refrigerating or heating effect due to lack of refrigerant. Therefore, if the air conditioning system is in a heating mode, the temperature value of the indoor unit connected with the electronic expansion valve to be detected is obviously lower than that of other indoor units; or, if the air conditioning system is in the cooling mode, the temperature value of the indoor unit connected with the electronic expansion valve is significantly higher than that of other indoor units. In this way, the indoor unit with the lowest temperature during heating or the indoor unit with the highest temperature during cooling is taken as the target indoor unit, and if the temperature value of the target indoor unit is greatly different from the average value of the temperatures of the indoor units, the target indoor unit is considered to be obviously influenced by the electronic expansion valve, so that the indoor unit connected with the electronic expansion valve to be detected can be determined. Based on this, can detect in the paired indoor set of the electronic expansion valve that waits to detect through air conditioning system automated inspection, improve detection efficiency, and saved the manpower.

For further describing the scheme of the present application, fig. 2 shows a schematic structural diagram of a multi-split air conditioning system provided in an embodiment of the present application.

Referring to fig. 2 or 3, the air conditioning system 10 includes: an outdoor unit 11, a throttle device 12, a plurality of indoor units 13, and a controller (not shown).

Wherein the throttle device 12 comprises a plurality of electronic expansion valves 121. There is a pipe connection between the outdoor unit 11 and the plurality of indoor units 13, and an electronic expansion valve 121 is provided on a pipe between each indoor unit 13 and the outdoor unit 11. The conduit, also known as a gas-liquid tube, comprises: a gas pipe for transporting the gaseous refrigerant, and a liquid pipe for transporting the two-phase refrigerant. Further, the outdoor unit 11, the throttle device 12, and the plurality of indoor units 13 are all communicatively connected to a controller (not shown), and perform related operations according to instructions of the controller.

The outdoor unit 11 is typically disposed outdoors to assist in heat exchange in an indoor environment. The throttle device 12 is used for adjusting the flow rate of fluid in the air-conditioning gas-liquid pipe and adjusting the flow rate of refrigerant. The electronic expansion valves 121 are used for adjusting the supply amount of the refrigerant in the pipeline, and the electronic expansion valves 121 may be independent of the outdoor unit 11 (as shown in fig. 2) or may be attached to a part of the outdoor unit 11 (as shown in fig. 3). The plurality of indoor units 13 may be indoor hanging units or indoor cabinet units, which is not limited in this embodiment. The number of electronic expansion valves and the number of indoor units shown in fig. 2 or 3 are merely examples, and do not limit the embodiments of the present application.

Taking the example that the plurality of electronic expansion valves 121 are independent of the outdoor unit 11, a schematic diagram of a refrigeration cycle of a multi-split air conditioning system is shown in fig. 4.

As shown in fig. 4, the multi-split air conditioning system includes an outdoor unit 11, a throttle device 12, a plurality of indoor units 13, and a controller (not shown in fig. 4).

The outdoor unit 11 includes: a compressor 111, an outdoor heat exchanger 112, a receiver 113, and a four-way valve 114. In some embodiments, the outdoor unit 11 further includes one or more of the following: a second temperature sensor 115 for detecting an outdoor ambient temperature, an outdoor fan (not shown in fig. 4), and an outdoor fan motor (not shown in fig. 4).

The throttling device 12 is used for adjusting the flow rate of fluid in the air-conditioning gas-liquid pipe. Wherein the throttle device 12 comprises a plurality of electronic expansion valves 121. A plurality of electronic expansion valves 121 are provided on the pipes between the plurality of indoor units 13 and the outdoor unit 11 for controlling the supply amount of the refrigerant.

The indoor unit 13 includes: indoor heat exchanger 131 and indoor fan 133. In some embodiments, the indoor unit 13 further comprises one or more of the following: a first temperature sensor 132 for detecting an indoor temperature, an indoor fan motor (not shown in fig. 4), and a display (not shown in fig. 4).

In some embodiments, the compressor 111 is disposed between the throttling device 12 and the accumulator 113 for compressing the refrigerant delivered by the accumulator 1113 and delivering the compressed refrigerant to the throttling device 12 via the four-way valve 114. The compressor 111 may be an inverter compressor of variable capacity that performs rotational speed control based on an inverter.

In some embodiments, the outdoor heat exchanger 112 is connected at one end to the accumulator 113 via a four-way valve 114 and at the other end to the restriction 12. The outdoor heat exchanger 112 has a first inlet and outlet for allowing the refrigerant to flow between the outdoor heat exchanger 112 and the suction port of the compressor 111 via the accumulator 113, and has a second inlet and outlet for allowing the refrigerant to flow between the outdoor heat exchanger 112 and the expansion device 12. The outdoor heat exchanger 112 exchanges heat between the outdoor air and the hot and cold air flowing through the heat transfer pipe connected between the first inlet and the second inlet, and the outdoor heat exchanger 112 operates as a condenser in the cooling cycle.

In some embodiments, the accumulator 113 is connected to the compressor 111 at one end and to the outdoor heat exchanger 112 via a four-way valve 114 at the other end. In the accumulator 113, the refrigerant flowing from the outdoor heat exchanger 112 to the compressor 111 via the four-way valve 114 is separated into a gas refrigerant and a liquid refrigerant. The gas refrigerant is mainly supplied from the accumulator 113 to the suction port of the compressor 111.

In some embodiments, four ports of the four-way valve 114 are respectively connected to the compressor 111, the outdoor heat exchanger 112, the accumulator 113, and the plurality of electronic expansion valves 121. The four-way valve 114 is used to switch between cooling and heating by changing the flow direction of the refrigerant in the system piping.

In some embodiments, the outdoor fan facilitates heat exchange with the outdoor air by generating an airflow of the outdoor air through the outdoor heat exchanger 112 to promote heat exchange with the outdoor air by the refrigerant flowing in the heat transfer tube between the first and second inlets and outlets.

In some embodiments, the outdoor fan motor is used to drive or alter the rotational speed of the outdoor fan.

In some embodiments, the electronic expansion valve 121 has a function of expanding and decompressing the refrigerant flowing through the electronic expansion valve 121, and may be used to adjust the supply amount of the refrigerant in the pipe. When the electronic expansion valve 121 decreases in opening degree, the flow path resistance of the refrigerant passing through the electronic expansion valve 121 increases. When the electronic expansion valve 121 increases in opening degree, the flow path resistance of the refrigerant passing through the electronic expansion valve 121 decreases. In this way, even if the state of other devices in the circuit does not change, when the opening degree of the electronic expansion valve 121 changes, the flow rate of the refrigerant flowing to the indoor unit 13 changes.

In some embodiments, the indoor heat exchanger 131 has a third inlet and outlet for flowing liquid refrigerant between it and the electronic expansion valve 121, and has a fourth inlet and outlet for flowing gaseous refrigerant between it and the discharge outlet of the compressor 111. The indoor heat exchanger 131 exchanges heat between the indoor air and the refrigerant flowing through the heat transfer pipe connected between the third inlet and the fourth inlet.

In some embodiments, the indoor fan 133 generates an airflow of the indoor air passing through the indoor heat exchanger 131 to promote heat exchange of the refrigerant flowing in the heat transfer pipe between the third inlet and the fourth inlet with the indoor air.

In some embodiments, the indoor fan motor 133 is used to drive or change the rotational speed of the indoor fan 113.

In some embodiments, the display is used to display the indoor temperature or the current mode of operation.

In the embodiment shown in the application, the controller refers to a device that can generate an operation control signal according to an instruction operation code and a time sequence signal, and instruct the multi-split air conditioning system to execute a control instruction. By way of example, the controller may be a central processing unit (central processing unit, CPU), a general purpose processor network processor (network processor, NP), a digital signal processor (digital signal processing, DSP), a microprocessor, a microcontroller, a programmable logic device (programmable logic device, PLD), or any combination thereof. The controller may also be any other device having a processing function, such as a circuit, a device, or a software module, which is not limited in any way by the embodiments of the present application.

Referring to fig. 5, a schematic structural diagram of a controller according to an embodiment of the present application is provided. As shown in fig. 5, the controller 14 includes an outdoor control module 141 and an indoor control module 142. The outdoor control module 141 includes a first memory 1411, and the indoor control module 142 includes a second memory 1421. The indoor unit control module 142 is connected to the outdoor unit control module 141 through wired or wireless communication. The outdoor control module 141 may be installed in the outdoor unit 11 or may be independent of the outdoor unit 11 to control the outdoor unit 11 and the throttle device 12 to perform related operations. The indoor control module 142 may be installed in the indoor unit 13, or may be independent of the indoor unit 13, and may be used to control components of the indoor unit 13 to perform related operations. It should be understood that the above division of the modules is only a functional division, and the outdoor control module 141 and the indoor control module 142 may be integrated in one module. The first memory 1411 and the second memory 1421 can also be integrated as one memory.

In some embodiments, the first memory 1411 is used to store applications and data related to the outdoor unit 11 and the electronic expansion valve 121, and the outdoor control module 141 performs various functions of the air conditioning system and data processing by running the applications and data stored in the memory 1411. The first memory 1411 mainly includes a program storage area and a data storage area, wherein the program storage area can store an operating system and application programs (such as an outdoor fan on function, an outdoor temperature measurement function, etc.) required by at least one function; the storage data area may store data (such as outdoor temperature, opening degree of each electronic expansion valve, etc.) created according to the use of the air conditioning system. In addition, the first memory 1411 may include high-speed random access memory, and may also include nonvolatile memory, such as magnetic disk storage devices, flash memory devices, or other volatile solid state storage devices, and the like.

In some embodiments, the second memory 1421 is used to store applications and data related to the indoor unit 13, and the indoor control module 1421 performs various functions of the air conditioning system and data processing by running the applications and data stored in the memory 1421. The second memory 1421 mainly includes a program storage area and a data storage area, where the program storage area can store an operating system and at least one application program required by a function (such as an indoor unit fan on function, an indoor temperature measurement function, etc.); the storage data area may store data (such as indoor temperature, etc.) created according to the use of the air conditioning system. In some examples, the second memory 1421 is also used to store a correspondence between an address of the indoor unit 13 and an address of the electronic expansion valve 121.

In some embodiments, the outdoor control module 141 is in communication with the outdoor unit 11, and is configured to control the outdoor unit to perform related operations according to a user command or a default command of the system. Alternatively, the outdoor control module 141 may control the rotation speed of the outdoor fan according to an air conditioner operation mode selected by a user. Alternatively, the outdoor control module 141 may also acquire an outdoor temperature according to a user instruction or a system instruction and store the acquired outdoor temperature to the first memory 1411. Optionally, the outdoor control module 141 may further control the four-way valve 114 in the outdoor unit 11 to rotate according to the air conditioning operation mode selected by the user, so as to realize the selection of the cooling or heating mode. Alternatively, the outdoor control module 141 may also control the operation mode of the outdoor unit 11, the compressor frequency, etc. during the address correction.

In some embodiments, a communication link exists between the outdoor control module 141 and the plurality of electronic expansion valves 121 for controlling the plurality of electronic expansion valves to perform related operations according to user instructions or system default instructions. Alternatively, the outdoor control module 141 may also control the opening degree of each electronic expansion valve 121 according to a user instruction or a system instruction.

In some embodiments, a communication link exists between the indoor control module 142 and the indoor unit 13 for controlling the indoor unit 13 to perform related operations according to user instructions or system default instructions. Alternatively, the indoor control module 142 controls the indoor unit 13 to turn on the indoor fan and the fan motor according to a user instruction. Optionally, the indoor control module 142 may also control the indoor unit to turn on or off the compressor in the indoor unit according to a user instruction. Optionally, the indoor control module 142 may also control the indoor unit to turn on the indoor temperature sensor according to a user instruction, and detect indoor temperature measurement.

It should be understood that the embodiments shown in fig. 4 and 5 are described above by taking the throttling device 12 as an example independent of the outdoor unit 11, and the refrigeration cycle principle of the air conditioning system is still applicable if the throttling device 12 is located inside the outdoor unit 11, and will not be described again.

Fig. 6 is an interaction schematic diagram of the controller 14 and the terminal device 300 of the multi-split air conditioning system according to the embodiment of the present application.

As shown in fig. 6, the terminal device 300 may establish a communication connection with the controller 14 of the air conditioning system. By way of example, the establishment of the communication connection may be accomplished using any known network communication protocol. The network communication protocol may be various wired or wireless communication protocols such as Ethernet, universal serial bus (universal serial bus, USB), FIREWIRE (FIREWIRE), any cellular network communication protocol (e.g., 3G/4G/5G), bluetooth, wireless Fidelity (wireless fidelity, wi-Fi), NFC, or any other suitable communication protocol. The communication connection may be a bluetooth connection, NFC, zigbee, wireless fidelity (wireless fidelity, wi-Fi), or the like. This is not particularly limited in the embodiments of the present application.

Note that the terminal device 300 shown in fig. 6 is only one example of a terminal device. The terminal device 300 in the present application may be a remote controller, a mobile phone, a tablet computer, a personal computer (personal computer, PC), a personal digital assistant (personal digital assistant, PDA), a smart watch, a netbook, a wearable electronic device, an augmented reality (augmented reality, AR) device, a Virtual Reality (VR) device, a robot, or the like, and the specific form of the terminal device is not particularly limited in the present application.

Taking the terminal device 300 as a mobile phone as an example, in some embodiments, the operation mode of the air conditioning system may be set by the terminal device. As shown in fig. 7, a management interface 301 of the multi-split air conditioning system is displayed on the terminal device, and the management interface 301 includes a key 302 of "mode management". It is detected that the user clicks the "mode management" button 302 in the management interface 301, and the terminal device pulls the selection box 303 in the management page 301 pop-up running mode. After detecting that the user pulls down the selection instruction of the selection box 303 in the operation mode, the terminal device sends the instruction to the multi-split air conditioning system to complete the setting of the operation mode.

In some embodiments, the user may initiate the address correction function through the management interface of the terminal device 300. As shown in fig. 8, the management interface 301 of the terminal device includes a "pairing detection" button, the button 3041 shown in fig. 8 is in an off state of the "pairing detection" button, the terminal device detects that a user clicks a switch of the "pairing detection" button, changes the state of the "pairing detection" button into an on state shown in 3042, and transmits an instruction for starting pairing detection to the multi-split air conditioning system, so that the air conditioning system enters pairing detection of the electronic expansion valve and the indoor unit.

The embodiments provided in the present application are specifically described below with reference to the drawings attached to the specification.

As shown in fig. 9, an embodiment of the present application provides a control method of a multi-split air conditioning system, where the method includes:

s101, a controller of the multi-split air conditioning system starts an outdoor unit, each indoor unit and each electronic expansion valve so that each indoor unit operates in a refrigeration mode.

The electronic expansion valve is used for adjusting the supply quantity of the refrigerant in the pipeline.

In some embodiments, as shown in fig. 10, step S101 is implemented as the following steps:

s1011, the controller acquires the temperature value of the outdoor unit.

Optionally, the multi-split air conditioning system may acquire a temperature value of the outdoor unit through a second temperature sensor built in the outdoor unit.

And S1012, when the temperature value of the outdoor unit is greater than or equal to a first temperature threshold value, the controller starts the outdoor unit, each indoor unit and each electronic expansion valve so that each indoor unit operates in a refrigeration mode.

In some examples, the step S1012 is implemented as the following steps: the outdoor unit and each indoor unit are started, the compressor is controlled to run at the preset frequency, the fans of each indoor unit are controlled to rotate at the same preset frequency, the electronic expansion valves are started, and each electronic expansion valve is controlled to run at the same preset opening.

S102, closing a target electronic expansion valve by a controller of the multi-split air conditioning system.

The target electronic expansion valve is an electronic expansion valve to be detected.

In some embodiments, step S102 is embodied as: the controller of the multi-split air conditioning system closes the target electronic expansion valve, keeps other electronic expansion valves to continuously operate at the same opening while closing the target electronic expansion valve, rotates all indoor units at the same fan frequency, and keeps the outdoor units of the multi-split air conditioning system to continuously operate.

In some embodiments, the controller of the multi-split air conditioning system closes the target electronic expansion valve if the first preset condition is met. Wherein the first preset condition includes one or more of the following:

in condition 1, the difference between the maximum temperature value and the minimum temperature value in the first temperature values of the indoor units at the first moment is smaller than the second temperature threshold.

It should be understood that the target electronic expansion valve is closed in order to compare the temperature conditions of each indoor unit after the target electronic expansion valve is closed. Therefore, before the target electronic expansion valve is closed, the indoor units are ensured to keep stable state at similar temperature. When the difference between the maximum temperature value and the minimum temperature value in the first temperature values of the indoor units is smaller than the second temperature threshold value, the temperature of the indoor units is close, the running condition is close, and the indoor units are in a stable working state.

And 2, enabling the duration of the indoor unit operation refrigeration mode to reach a first preset duration.

It should be understood that before the target electronic expansion valve is closed, the indoor units should be ensured to keep stable at similar temperatures, so as to compare the temperature conditions of the indoor units after the target electronic expansion valve is closed. When the air conditioning system is operated for a first preset period of time, each indoor unit is in a stable working state, and the requirements can be considered to be met.

And S103, after a second preset time period, the controller collects a second temperature value of each indoor unit at a second moment, and selects the indoor unit with the largest second temperature value as the target indoor unit.

Wherein the second time is located after the first time.

In some embodiments, the controller collects a second temperature value of each indoor unit at a second time by a first temperature sensor built into each indoor unit.

For example, taking a second preset duration of 20 minutes as an example, if there are 4 indoor units in the multi-split air conditioning system, after the target electronic expansion valve is closed for 20 minutes, the controller uses the indoor units with second temperature values of 32 ℃ as target indoor units when the second temperature values acquired by the first temperature sensors built in the indoor units are 22 ℃, 21 ℃ and 32 ℃ respectively.

It should be appreciated that when the target electronic expansion valve is closed, the indoor unit connected to the target electronic expansion valve will have a great difference in temperature from the other indoor units due to the lack of refrigerant. But this temperature difference does not suddenly change, but gradually develops over time. Therefore, in order to capture the above temperature difference, the temperatures of the indoor units should be obtained after the target electronic expansion valve is closed and the air conditioning system is operated for a second preset period of time. In addition, since the air conditioning system of the above step S103 is in the cooling mode, the indoor unit connected to the target electronic expansion valve will significantly decrease in cooling capacity due to lack of refrigerant. At this time, the indoor unit with the highest temperature in the air conditioning system is most likely to be the indoor unit connected with the target electronic expansion valve, so that the indoor unit with the highest temperature in the air conditioning system is taken as the target indoor unit, so as to further judge whether the target indoor unit and the target electronic expansion valve are matched.

And S104, if the difference value of the second temperature value minus the first temperature average value of the target indoor unit is larger than the third temperature threshold value, determining that the target indoor unit is paired with the target electronic expansion valve.

Wherein the first temperature average value is determined according to the second temperature value of each indoor unit.

Alternatively, the first temperature average value may be an average value of the second temperature values of the respective indoor units.

For example, if the second temperature value of the target indoor unit is 30 ℃, and the second temperature values of the other indoor units are 13 ℃, 11 ℃, and 12 ℃, respectively, the first temperature average value is ((30+13+11+12)/4) °c, that is, 16.5 ℃.

It should be understood that after the target electronic expansion valve to be detected is closed, the indoor unit connected to the target electronic expansion valve is degraded in refrigerating effect due to lack of refrigerant. At this time, the temperature value of the indoor unit connected to the target electronic expansion valve is significantly higher than that of the other indoor units. When the average value of the second temperature values of the indoor units is taken as the first temperature average value, if the difference value of the second temperature value minus the temperature average value of the target indoor unit is larger than the third temperature threshold value, the second temperature value of the target indoor unit is considered to be obviously higher than the second temperature value of each indoor unit, and therefore the target indoor unit is considered to be the indoor unit connected with the target electronic valve, and the target indoor unit is paired with the target electronic expansion valve.

Alternatively, the first temperature average value may be an average value of the second temperature values of the respective indoor units after the target indoor unit is removed.

For example, if the second temperature value of the target indoor unit is 30 ℃, the second temperature values of the other indoor units are 23 ℃, 21 ℃, and 22 ℃, respectively, the first temperature average value is ((23+21+22)/3) °c, that is, 22 ℃.

It should be understood that, taking the average value of the second temperature values of each indoor unit after the target indoor unit is removed as the average temperature value, the interference of the second temperature value of the target indoor unit can be removed, and at this time, the difference value of the second temperature value minus the temperature average value of the target indoor unit can more accurately reflect the temperature difference between the target indoor unit and other indoor units, thereby improving the detection precision. Similarly, if the difference of the second temperature value minus the first temperature average value of the target indoor unit is greater than the third temperature threshold value, the temperature of the target indoor unit is considered to be significantly higher than that of other indoor units, and therefore the target indoor unit is considered to be an indoor unit connected with the target electronic valve, and the target indoor unit is determined to be paired with the target electronic expansion valve.

In some embodiments, when it is determined that the target indoor unit is paired with the target electronic expansion valve, the controller changes address information of the electronic expansion valve corresponding to the target indoor unit in the pairing status table to address information of the target electronic expansion valve. Or the controller changes the address information of the indoor unit corresponding to the target electronic expansion valve in the pairing condition table into the address information of the target indoor unit. Therefore, the pairing condition table of the target indoor unit and the target electronic expansion valve can be updated in time, address error correction is realized, and debugging efficiency is improved.

In some embodiments, when the multi-split air conditioning system starts the pairing detection function, the multi-split air conditioning system judges whether an electronic expansion valve which is not paired to detect exists after the pairing detection of the target electronic expansion valve to be detected is completed. If so, selecting one electronic expansion valve from the electronic expansion valves which are not matched and detected as the electronic expansion valve which is detected next time, and repeatedly executing the steps S101 to S104 until all the electronic expansion valves finish the matched and detected. Based on the method, the multi-split air conditioning system traverses the pairing condition of each electronic expansion valve and the indoor unit in the system, and can timely realize address correction when the pairing is wrong, so that the debugging efficiency of the air conditioning system is improved.

In some examples, after the multi-split air conditioning system completes pairing detection of all the electronic expansion valves, a prompt message for prompting that the pairing detection is completed is sent.

Optionally, the multi-split air conditioning system can send out prompt information. For example, the "pairing detection completed, please restart the air conditioner" may be played in voice form, or the user may be prompted in the form of beeps, blinks of signal lights, vibrations, etc., which is not limited in the embodiment of the present application.

Optionally, the multi-split air conditioning system may send a prompt message to the terminal device. For example, as shown in fig. 11, the controller 14 of the multi-split air conditioning system sends a prompt message to the terminal device 300, the prompt message is displayed on the terminal device interface in the form of a text popup window 305, and the text popup window 305 displays the following information that the pairing detection is completed-! "literal information. In addition, when the terminal device displays the prompt information, the user may be prompted by other modes such as text, voice, music, vibration, animation, and the like, which is not limited in the embodiment of the present application.

In some embodiments, if the difference value of the second temperature value minus the first temperature average value of the target indoor units of the multi-split air conditioning system is less than or equal to the third temperature threshold value, the multi-split air conditioning system sends out prompt information for prompting that the target electronic valve is not connected with the indoor units.

It should be understood that if the difference value of the second temperature value minus the average value of the temperatures of the target indoor units of the multi-split air conditioning system is smaller than or equal to the third temperature threshold value, it means that the second temperature values of the indoor units are still not greatly different after the target electronic expansion valve is closed, the second temperature values of the indoor units are hardly affected by the target electronic expansion valve, and the target electronic expansion valve is not connected with the indoor units at this time, so that the multi-split air conditioning system is controlled to send prompt information.

For example, the multi-split air conditioning system may alert by voice prompt, for example, may prompt "alert-! Expansion valve unconnected ≡! ". Further, the multi-split air conditioning system can stop running when the fact that the electronic expansion valve is not connected is detected, so that maintenance is facilitated.

For example, as shown in fig. 12, the controller 14 of the multi-split air conditioning system sends a prompt message to the terminal device 300, the prompt message is displayed on the terminal device interface in the form of a text popup window 306, and the text popup window 306 displays the following information! Expansion valve unconnected ≡! "literal information. Further, as shown in fig. 13, if the terminal device detects that the user clicks the text pop-up window 306, the management page 307 of the multi-split air conditioning system is entered. The management page 307 of the multi-split air conditioning system includes a key-off button 308 of the air conditioning system, and when the terminal device 300 detects that the user clicks the button 308, an instruction is sent to the multi-split air conditioning system, so that the multi-split air conditioning system shuts off the indoor unit, the outdoor unit and the electronic expansion valve, so as to be overhauled in time.

As shown in fig. 14, an embodiment of the present application provides another control method of a multi-split air conditioning system, where the method includes:

S201, a controller of the multi-split air conditioning system starts an outdoor unit, each indoor unit and each electronic expansion valve, so that each indoor unit operates in a heating mode.

In some embodiments, as shown in fig. 15, step S201 is embodied as the following steps:

and S2011, the controller acquires the temperature value of the outdoor unit.

And S2012, when the temperature value of the outdoor unit is smaller than the first temperature threshold value, the controller starts the outdoor unit, each indoor unit and each electronic expansion valve so that each indoor unit operates in a heating mode.

In some examples, the step S2012 described above is embodied as the following steps: the outdoor unit and each indoor unit are started, the compressor is controlled to run at the preset frequency, the fans of each indoor unit are controlled to rotate at the same preset frequency, the electronic expansion valves are started, and each electronic expansion valve is controlled to run at the same preset opening.

S202, closing a target electronic expansion valve by a controller of the multi-split air conditioning system.

In some embodiments, step S202 is embodied as: the controller of the multi-split air conditioning system closes the target electronic expansion valve, keeps other electronic expansion valves to continuously operate at the same opening while closing the target electronic expansion valve, rotates all indoor units at the same fan frequency, and keeps the outdoor units of the multi-split air conditioning system to continuously operate.

In some embodiments, the controller of the multi-split air conditioning system closes the target electronic expansion valve if the second preset condition is met. Wherein the second preset condition includes one or more of the following:

and in the condition 1, the difference between the maximum temperature value and the minimum temperature value in the third temperature value of each indoor unit at the third moment is smaller than or equal to the fourth temperature threshold.

Wherein the third time is before the fourth time.

It should be understood that the target electronic expansion valve is closed in order to compare the temperature conditions of each indoor unit after the target electronic expansion valve is closed. Therefore, before the target electronic expansion valve is closed, the indoor units are ensured to keep stable state at similar temperature. When the difference between the maximum temperature value and the minimum temperature value in the third temperature values of the indoor units is smaller than or equal to the fourth temperature threshold value, the temperature of the indoor units is close, the running condition is close, and the indoor units are in a stable working state.

And 2, enabling the duration of the indoor unit operation heating mode to reach a third preset duration.

It should be understood that before the target electronic expansion valve is closed, the indoor units should be ensured to keep stable at similar temperatures, so as to compare the temperature conditions of the indoor units after the target electronic expansion valve is closed. When the air conditioning system is operated for a third preset period of time, each indoor unit is in a stable working state, and the requirements can be considered to be met.

And S203, after a fourth preset time period, the controller collects a fourth temperature value of each indoor unit at a fourth moment, and selects the indoor unit with the smallest fourth temperature value as the target indoor unit.

Wherein the fourth time is located after the third time.

In some embodiments, the controller collects a fourth temperature value of each indoor unit at a fourth time by a first temperature sensor built into each indoor unit.

For example, taking a fourth preset duration of 20 minutes as an example, if there are 4 indoor units in the multi-split air conditioning system, after the target electronic expansion valve is closed for 20 minutes, the controller takes the indoor unit with the fourth temperature value of 2 ℃ as the target indoor unit, where the fourth temperature value is 22 ℃, 21 ℃ and 2 ℃ respectively, which are acquired by the first temperature sensor built in each indoor unit.

It should be appreciated that when the target electronic expansion valve is closed, the indoor unit connected to the target electronic expansion valve will have a great difference in temperature from the other indoor units due to the lack of refrigerant. But this temperature difference does not suddenly change, but gradually develops over time. Therefore, in order to capture the above temperature difference, the temperatures of the indoor units should be obtained after the target electronic expansion valve is closed and the air conditioning system is operated for a fourth preset period of time. In addition, since the air conditioning system of the above step S203 is in the heating mode, the indoor unit connected to the target electronic expansion valve will significantly decrease in heating capacity due to lack of refrigerant. At this time, the indoor unit with the lowest temperature in the air conditioning system is most likely to be the indoor unit connected with the target electronic expansion valve, so that the indoor unit with the lowest temperature in the air conditioning system is taken as the target indoor unit, so as to further judge whether the target indoor unit and the target electronic expansion valve are matched.

And S204, if the difference value of the second temperature average value minus the fourth temperature value of the target indoor unit is larger than the fifth temperature threshold value, determining that the target indoor unit is paired with the target electronic expansion valve.

Wherein the second temperature average value is determined according to the fourth temperature value of each indoor unit.

Alternatively, the second temperature average value may be an average value of fourth temperature values of the respective indoor units.

For example, if the fourth temperature value of the target indoor unit is 0 ℃, the second temperature values of the other indoor units are 18 ℃, 20 ℃, and 22 ℃, respectively, the second temperature average value is ((0+18+20+22)/4) °c, that is, 15 ℃.

It should be understood that after the target electronic expansion valve to be detected is closed, the indoor unit connected to the target electronic expansion valve is reduced in heating effect due to lack of refrigerant. At this time, the temperature value of the indoor unit connected with the target electronic expansion valve is obviously lower than that of other indoor units. When the average value of the fourth temperature values of the indoor units is taken as the second temperature average value, if the difference value of the second temperature average value minus the fourth temperature value of the target indoor unit is larger than the fifth temperature threshold value, the fourth temperature value of the target indoor unit is considered to be obviously lower than the fourth temperature value of each indoor unit, and therefore the target indoor unit is considered to be the indoor unit connected with the target electronic valve, and the target indoor unit is paired with the target electronic expansion valve.

Alternatively, the second temperature average value may be an average value of fourth temperature values of the respective indoor units after the target indoor unit is removed.

For example, if the fourth temperature value of the target indoor unit is 0 ℃, and the fourth temperature values of the other indoor units are 18 ℃, 20 ℃, and 22 ℃, respectively, the second temperature average value is ((18+20+22)/3) °c, that is, 20 ℃.

It should be understood that, taking the average value of the fourth temperature values of each indoor unit after the target indoor unit is removed as the second average temperature value, the interference of the fourth temperature value of the target indoor unit can be removed, and at this time, the difference value of the fourth temperature value of the target indoor unit subtracted from the temperature average value can more accurately reflect the temperature difference between the target indoor unit and other indoor units, thereby improving the detection precision. Similarly, if the difference of the temperature average value minus the fourth temperature value of the target indoor unit is greater than the fifth temperature threshold value, the temperature of the target indoor unit is considered to be significantly lower than that of other indoor units, and therefore the target indoor unit is considered to be an indoor unit connected with the target electronic valve, and the target indoor unit is determined to be paired with the target electronic expansion valve.

In some embodiments, when the multi-split air conditioning system starts the pairing detection function, the multi-split air conditioning system judges whether an electronic expansion valve which is not paired to detect exists after the pairing detection of the target electronic expansion valve to be detected is completed. If so, selecting one electronic expansion valve from the electronic expansion valves which are not matched and detected as the electronic expansion valve which is detected next time, and repeatedly executing the steps S201 to S204 until all the electronic expansion valves finish the matched and detected. Based on the method, the multi-split air conditioning system traverses the pairing condition of each electronic expansion valve and the indoor unit in the system, and can timely realize address correction when the pairing is wrong, so that the debugging efficiency of the air conditioning system is improved.

Optionally, the multi-online air conditioning system may send a prompt message to the terminal device, for example, the terminal device may prompt the user through text, voice, music, vibration, animation, and other manners, which is not limited in this embodiment of the present application.

In some embodiments, if the difference value of the second temperature average value minus the fourth temperature value of the target indoor unit of the multi-split air conditioning system is smaller than or equal to the fifth temperature threshold value, the multi-split air conditioning system sends a prompt message for prompting that the target electronic valve is not connected with the indoor unit.

It should be understood that if the difference value of the second temperature average value minus the fourth temperature value of the target indoor unit of the multi-split air conditioning system is smaller than or equal to the fifth temperature threshold value, it means that the fourth temperature value of each indoor unit is still not greatly different after the target electronic expansion valve is closed, and the fourth temperature value of each indoor unit is hardly affected by the target electronic expansion valve, and at this time, the target electronic expansion valve is not connected with the indoor unit, so that the multi-split air conditioning system is controlled to send prompt information.

Optionally, the multi-split air conditioning system can send out prompt information. For example, the multi-split air conditioning system may alert by voice prompt, for example, may prompt "alert-! Expansion valve unconnected ≡! ". Further, the multi-split air conditioning system can stop running when the fact that the electronic expansion valve is not connected is detected, so that maintenance is facilitated.

Optionally, the multi-split air conditioning system sends a prompt message to the terminal device, as still shown in fig. 12. The controller 14 of the multi-split air conditioning system sends out prompt information to the terminal device 300, the prompt information is displayed on the terminal device interface in the form of a character popup window 306, and the character popup window 306 displays' warning! Expansion valve unconnected ≡! "literal information. Further, as shown in fig. 13, if the terminal device detects that the user clicks the text pop-up window 306, the management page 307 of the multi-split air conditioning system is entered. The management page 307 of the multi-split air conditioning system includes a key-off button 308 of the air conditioning system, and when the terminal device 300 detects that the user clicks the button 308, an instruction is sent to the multi-split air conditioning system, so that the multi-split air conditioning system shuts off the indoor unit, the outdoor unit and the electronic expansion valve, so as to be overhauled in time.

It should be understood that, in the embodiment shown in fig. 9, the pairing detection of the electronic expansion valves is completed in the refrigeration mode of the multi-split air conditioning system, and in the embodiment shown in fig. 14, the pairing detection of the electronic expansion valves is completed in the heating mode of the multi-split air conditioning system.

Optionally, the controller of the multi-split air conditioning system may execute the pairing detection process when an address correction instruction input by the terminal device is detected.

Optionally, the controller of the multi-split air conditioning system may execute the above-mentioned process of pairing detection of the electronic expansion valve according to a default time interval. Illustratively, the multi-split air conditioning system automatically performs the electronic expansion valve pairing detection process shown in fig. 9 or 14 described above every three days.

Optionally, the controller of the multi-split air conditioning system starts a mismatching early warning function, when the air conditioner is in a refrigeration mode, the pairing condition of the electronic expansion valve is detected by default, and when the situation that the electronic expansion valve and the indoor unit are in mismatching in the air conditioning system is detected, the pairing detection process is executed.

For example, as shown in fig. 16, in the case that the multi-split air conditioning system starts the mismatching pre-warning function, the multi-split air conditioning system further performs the following steps:

and Sa1, when the multi-split air conditioning system is in a refrigeration mode, acquiring the temperature value of each indoor unit in a starting state and the temperature value of each indoor unit not in the starting state.

And Sa2, if the condition that the temperature value of at least one indoor unit in an unopened state in a fifth preset time period is smaller than a sixth temperature threshold value and the temperature value of at least one indoor unit in a started state in the fifth preset time period is larger than a seventh temperature threshold value exists, sending alarm information for prompting that the indoor unit and the electronic expansion valve are in wrong pairing.

It can be seen that the foregoing description of the solution provided by the embodiments of the present application has been presented mainly from a method perspective. To achieve the above-mentioned functions, embodiments of the present application provide corresponding hardware structures and/or software modules that perform the respective functions. Those of skill in the art will readily appreciate that the various illustrative modules and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is implemented as hardware or computer software driven hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

The embodiment of the application may divide the functional modules of the controller according to the above method example, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated modules may be implemented in hardware or in software functional modules.

The embodiment of the present application further provides a schematic hardware structure of a controller, as shown in fig. 17, where the controller 2000 includes a processor 2001, and optionally, a memory 2002 and a communication interface 2003 connected to the processor 2001. The processor 2001, memory 2002 and communication interface 2003 are connected by a bus 2004.

The processor 2001 may be a central processing unit (central processing unit, CPU), a general purpose processor network processor (network processor, NP), a digital signal processor (digital signal processing, DSP), a microprocessor, a microcontroller, a programmable logic device (programmable logic device, PLD), or any combination thereof. The processor 2001 may also be any other device with processing functionality, such as a circuit, a device or a software module. The processor 2001 may also include multiple CPUs, and the processor 2001 may be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor. A processor herein may refer to one or more devices, circuits, or processing cores for processing data (e.g., computer program instructions).

Memory 2002 may be a read-only memory (ROM) or other type of static storage device that may store static information and instructions, a random access memory (random access memory, RAM) or other type of dynamic storage device that may store information and instructions, or an electrically erasable programmable read-only memory (electrically erasable programmable read-only memory, EEPROM), a compact disc read-only memory (compact disc read-only memory) or other optical disk storage, optical disk storage (including compact disc, laser disc, optical disc, digital versatile disc, blu-ray disc, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, as embodiments of the present application are not limited in this regard. The memory 2002 may be provided separately or may be integrated with the processor 2001. Wherein the memory 2002 may include computer program code. The processor 2001 is configured to execute computer program codes stored in the memory 2002, thereby implementing the control method provided in the embodiment of the present application.

The communication interface 2003 may be used to communicate with other devices or communication networks (e.g., ethernet, radio access network (radio access network, RAN), wireless local area network (wireless local area networks, WLAN), etc. the communication interface 2003 may be a module, circuit, transceiver, or any means capable of enabling communications.

Bus 2004 may be a peripheral component interconnect standard (peripheral component interconnect, PCI) bus or an extended industry standard architecture (extended industry standard architecture, EISA) bus, among others. The bus 2004 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in fig. 17, but not only one bus or one type of bus.

Embodiments of the present invention also provide a computer-readable storage medium including computer-executable instructions that, when executed on a computer, cause the computer to perform a method as provided in the above embodiments.

The embodiment of the present invention also provides a computer program product, which can be directly loaded into a memory and contains software codes, and the computer program product can implement the method provided by the above embodiment after being loaded and executed by a computer.

Those skilled in the art will appreciate that in one or more of the examples described above, the functions described in the present invention may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, these functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.

From the foregoing description of the embodiments, it will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of functional modules is illustrated, and in practical application, the above-described functional allocation may be implemented by different functional modules according to needs, i.e. the internal structure of the apparatus is divided into different functional modules to implement all or part of the functions described above.

In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described embodiments of the apparatus are merely illustrative, and the division of modules or units, for example, is merely a logical function division, and other manners of division are possible when actually implemented. For example, multiple units or components may be combined or may be integrated into another device, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form. The units described as separate parts may or may not be physically separate, and the parts shown as units may be one physical unit or a plurality of physical units, may be located in one place, or may be distributed in a plurality of different places. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units. The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a readable storage medium. Based on such understanding, the technical solution of the embodiments of the present application may be essentially or a part contributing to the prior art or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium, including several instructions for causing a device (may be a single-chip microcomputer, a chip or the like) or a processor (processor) to perform all or part of the steps of the method described in the embodiments of the present invention. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk, etc.

The foregoing is merely a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should be covered in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A multi-split air conditioning system, comprising:

an outdoor unit;

an electronic expansion valve is arranged between each indoor unit and the outdoor unit, and each indoor unit comprises a first temperature sensor for detecting the temperature of the indoor unit;

a controller configured to:

starting the outdoor unit, each indoor unit and each electronic expansion valve to enable each indoor unit to operate in a refrigeration mode;

closing the target electronic expansion valve;

after a second preset time period, collecting a second temperature value of each indoor unit at a second moment, and selecting the indoor unit with the largest second temperature value as a target indoor unit;

and if the difference value of the second temperature value of the target indoor unit minus the first temperature average value is larger than a third temperature threshold value, determining that the target indoor unit is paired with the target electronic expansion valve, wherein the first temperature average value is determined according to the second temperature value of each indoor unit.

2. The multi-split air-conditioning system according to claim 1, wherein the outdoor unit includes a second temperature sensor for detecting a temperature of the outdoor unit;

the controller is specifically configured to:

acquiring a temperature value of the outdoor unit;

And when the temperature value of the outdoor unit is greater than or equal to a first temperature threshold value, starting the outdoor unit, each indoor unit and each electronic expansion valve so that each indoor unit operates in a refrigeration mode.

3. The multi-split air-conditioning system of claim 1, wherein,

the controller is specifically configured to:

closing the target electronic expansion valve under the condition that the first preset condition is met;

wherein the first preset condition includes:

the difference between the maximum temperature value and the minimum temperature value in the first temperature value of each indoor unit at the first moment is smaller than a second temperature threshold value, and the first moment is positioned before the second moment; or alternatively, the process may be performed,

and the duration of the indoor unit operation refrigeration mode reaches a first preset duration.

4. The multi-split air conditioning system of any of claims 1-3, wherein the controller is further configured to:

when the multi-split air conditioning system is in a refrigeration mode, acquiring temperature values of all indoor units in a starting state and temperature values of all indoor units not in the starting state;

if the temperature value of at least one indoor unit in the non-started state in the fifth preset time period is smaller than the sixth temperature threshold value and the temperature value of at least one indoor unit in the started state in the fifth preset time period is larger than the seventh temperature threshold value, sending alarm information for prompting that the pairing errors exist between the indoor units and the electronic expansion valve.

5. A control method of a multi-split air conditioning system, the method comprising:

closing the target electronic expansion valve;