CN114791154A

CN114791154A - Multi-split air conditioner and cleaning method, control device and readable storage medium thereof

Info

Publication number: CN114791154A
Application number: CN202110109603.5A
Authority: CN
Inventors: 朱天贵; 张�浩; 黎顺全; 李健锋; 雷俊杰; 陈磊; 廖振华; 姚嘉; 刘帅帅; 李东; 周壮
Original assignee: GD Midea Air Conditioning Equipment Co Ltd
Current assignee: GD Midea Air Conditioning Equipment Co Ltd
Priority date: 2021-01-26
Filing date: 2021-01-26
Publication date: 2022-07-26

Abstract

The invention discloses a method for cleaning a multi-split air conditioner, which comprises the following steps: controlling the multi-online air-conditioning cold operation to frost a target indoor unit; the target indoor unit is one of at least two indoor units which receives a cleaning instruction; controlling heating operation of the multi-split air conditioner to defrost the target indoor unit; and when the defrosting of the target indoor unit is finished, controlling the multi-split air conditioner to maintain the heating operation, and adjusting the operation rotating speed of a fan corresponding to the target indoor unit so as to enable the temperature of the target indoor unit to reach the target sterilization temperature. The invention also discloses an air conditioner control device, a multi-split air conditioner and a computer readable storage medium. The invention aims to realize high-temperature sterilization after the indoor unit is cleaned, improve the cleaning effect and ensure that the air after the heat exchange of the indoor unit can ensure the health of indoor users.

Description

Multi-split air conditioner and cleaning method, control device and readable storage medium thereof

Technical Field

The present invention relates to the field of air conditioning technologies, and in particular, to a method for cleaning a multi-split air conditioner, an air conditioner control device, a multi-split air conditioner, and a computer-readable storage medium.

Background

The multi-split air conditioner refers to an air conditioner with a plurality of indoor units, most of the multi-split air conditioners have a self-cleaning function, generally comprise two stages of refrigeration frosting and heating defrosting, dirt in the indoor units is condensed through the refrigeration frosting, then the frost condensed with the dirt is melted through the heating defrosting, the dirt flows away along with defrosting water, and the indoor units are cleaned.

However, the existing multi-split air conditioner is not sterilized after cleaning, bacteria are easy to remain in the indoor unit, and air subjected to heat exchange of the indoor unit carries bacteria, so that the problem that the cleaning effect is poor and the health of indoor users is affected exists.

Disclosure of Invention

The invention mainly aims to provide a cleaning method of a multi-split air conditioner, which aims to realize high-temperature sterilization after an indoor unit is cleaned, improve the cleaning effect and ensure that the air after heat exchange of the indoor unit can ensure the health of indoor users.

In order to achieve the above object, the present invention provides a method for cleaning a multi-split air conditioner, the multi-split air conditioner including at least two indoor units, the method comprising the steps of:

controlling the multi-online air-conditioning cold operation to frost a target indoor unit; the target indoor unit is one of at least two indoor units which receives a cleaning instruction;

controlling heating operation of the multi-split air conditioner to defrost the target indoor unit;

and when the defrosting of the target indoor unit is finished, controlling the multi-split air conditioner to maintain the heating operation, and adjusting the operation rotating speed of a fan corresponding to the target indoor unit so as to enable the temperature of the target indoor unit to reach the target sterilization temperature.

Optionally, the step of adjusting the operating speed of the fan corresponding to the target indoor unit includes:

acquiring a first coil temperature of the target indoor unit, and acquiring a temperature threshold corresponding to the target sterilization temperature;

determining a rotation speed adjusting parameter according to the first coil temperature and the temperature threshold;

and adjusting the running rotating speed of the fan corresponding to the target indoor unit according to the rotating speed adjusting parameter.

Optionally, the temperature threshold includes a first temperature threshold, the first temperature threshold is smaller than the target sterilization temperature, the rotation speed adjustment parameter includes a rotation speed adjustment direction, and the step of determining the rotation speed adjustment parameter according to the first coil temperature and the temperature threshold includes:

when the first coil temperature is lower than the first temperature threshold value, determining that the rotating speed adjusting direction is a reduced rotating speed.

Optionally, the temperature threshold further includes a second temperature threshold, the second temperature threshold is greater than the target sterilization temperature, and the step of determining the rotation speed adjustment parameter according to the first coil pipe temperature and the temperature threshold further includes:

when the first coil temperature is larger than the second temperature threshold value, determining that the rotating speed adjusting direction is the increasing rotating speed.

Optionally, in the process of executing the step of controlling the multi-split air conditioner to maintain the heating operation and adjusting the operation rotation speed of the fan corresponding to the target indoor unit, the method further includes:

determining indoor units other than the target indoor unit in the started indoor units as other indoor units;

controlling fans corresponding to the other indoor units to be closed, and controlling the opening degrees of electronic expansion valves corresponding to the other indoor units to be reduced; and when the opening degree of the electronic expansion valve is reduced, the refrigerant quantity of other indoor units is reduced.

Optionally, before the step of adjusting the operating speed of the fan corresponding to the target indoor unit to make the temperature of the target indoor unit reach the target sterilization temperature, the method further includes:

when defrosting of the target indoor unit is finished, acquiring the outdoor environment temperature and the indoor environment temperature;

when the outdoor environment temperature meets a first temperature condition and the indoor environment temperature meets a second temperature condition, executing the step of adjusting the running rotating speed of a fan corresponding to the target indoor unit so as to enable the temperature of the target indoor unit to reach a target sterilization temperature;

when the outdoor environment temperature does not meet the first temperature condition or the indoor environment temperature does not meet the second temperature condition, controlling a compressor to stop and controlling a fan corresponding to the target indoor unit to operate at a rotating speed greater than a first set rotating speed;

the first temperature condition is that the outdoor environment temperature is smaller than a first set temperature and is larger than or equal to a second set temperature, the second temperature condition is that the indoor environment temperature is smaller than the first set temperature and is larger than or equal to a third set temperature, and the third set temperature is larger than the second set temperature.

Optionally, before the step of adjusting the operation speed of the fan corresponding to the target indoor unit to make the temperature of the target indoor unit reach the target sterilization temperature, the method further includes:

acquiring the outdoor environment temperature;

and acquiring the target sterilization temperature according to the outdoor environment temperature.

Optionally, the target sterilization temperature is in a decreasing trend with decreasing outdoor ambient temperature.

Optionally, in the process of adjusting the operating speed of the fan corresponding to the target indoor unit to make the temperature of the target indoor unit reach the target sterilization temperature, the method further includes:

when the multi-split air conditioner meets a first sterilization finishing condition or a second sterilization finishing condition, controlling a compressor to stop and controlling a fan corresponding to the indoor unit to operate at a rotating speed greater than a second set rotating speed;

the first sterilization ending condition is that the duration of heating operation of the multi-split air conditioner is greater than or equal to a target sterilization duration, the second sterilization ending condition is that the duration of heating operation of the indoor unit is greater than or equal to a preset temperature and is maintained for a preset duration, the preset duration is less than the target sterilization duration, and the preset temperature is greater than the target sterilization temperature.

acquiring operation state parameters of the multi-split air conditioner;

if the running state parameter indicates that no outdoor unit defrosting operation and compressor oil return operation exist after the target indoor unit defrosting of the multi-split air conditioner is finished, acquiring a first time length as the target sterilization time length;

if the running state parameter is that outdoor unit defrosting operation or compressor oil return operation exists after the target indoor unit defrosting of the multi-split air conditioner is finished, acquiring second time length as the target sterilization time length;

wherein the second duration is greater than the first duration.

Optionally, in the process of executing the step of adjusting the operation rotation speed of the fan corresponding to the target indoor unit, the method further includes:

and adjusting the running frequency of the compressor so as to enable the temperature of the target indoor unit to reach the target sterilization temperature.

Optionally, the step of adjusting the operating frequency of the compressor comprises:

acquiring the temperature of a first heat exchanger corresponding to the started indoor unit;

determining a first frequency adjustment parameter of the compressor according to the first heat exchanger temperature and the target sterilization temperature;

and controlling the compressor to adjust the running frequency according to the first frequency adjusting parameter.

Optionally, the step of determining a first frequency adjustment parameter of the compressor according to the first heat exchanger temperature and the target sterilization temperature comprises:

determining a first magnitude relationship between the first heat exchanger temperature and the target sterilization temperature, and determining a first temperature deviation between the first heat exchanger temperature and the target sterilization temperature;

determining a first adjusting direction of the compressor frequency according to the first size relation, and determining a first adjusting speed of the compressor frequency according to the first temperature deviation;

determining the first adjustment direction and the first adjustment rate as the first frequency adjustment parameter.

Optionally, the number of the turned-on indoor units is more than one, and the step of obtaining the temperature of the first heat exchanger corresponding to the turned-on indoor unit includes:

detecting the temperature of a second coil of each started indoor unit to obtain a first rated refrigerating capacity of each started indoor unit;

determining a first weight value corresponding to each started indoor unit according to the obtained first rated refrigerating capacity;

and performing weighted average calculation operation on more than one second coil temperature according to the first weight value to obtain the first heat exchanger temperature.

Optionally, the refrigeration frosting process of the multi-split air conditioner sequentially comprises a first refrigeration stage and a second refrigeration stage, and the step of controlling the multi-split air conditioner to perform refrigeration operation so as to frost a target indoor unit comprises the following steps:

in the first refrigeration stage, controlling the multi-split air-conditioning refrigeration operation according to a first parameter so as to condense the target indoor unit;

and in the second refrigeration stage, controlling the multi-split air-conditioning refrigeration operation according to a second parameter so as to condense the condensation on the target indoor unit into frost.

Optionally, the first parameter includes a target frequency of the compressor, and the step of controlling the multi-split air-conditioning cooling operation according to the first parameter in the first cooling stage to condense the target indoor unit includes:

in the first refrigeration stage, acquiring a second rated refrigeration capacity of the target indoor unit, and acquiring a third rated refrigeration capacity of the compressor;

determining a frequency correction parameter according to the numerical relationship between the second rated refrigerating capacity and the third rated refrigerating capacity;

determining the target frequency according to the set maximum frequency of the multi-split air-conditioning cold operation and the frequency correction parameter;

and controlling the compressor to perform refrigerating operation at the target frequency.

Optionally, before the step of controlling the compressor to operate at the target frequency, the method further includes:

comparing the target frequency with a set minimum frequency of the multi-split air-conditioning cold operation;

if the target frequency is less than or equal to the set minimum frequency, controlling the compressor to run at the set minimum frequency so as to condense the target indoor unit;

and if the target frequency is greater than the set minimum frequency, executing the step of controlling the compressor to perform refrigeration operation at the target frequency.

Optionally, the second parameter includes a second frequency adjustment parameter of the compressor, and the step of controlling the multi-split air-conditioning cooling operation according to the second parameter in the second cooling stage so as to condense condensation on the target indoor unit into frost includes:

in the second refrigeration stage, acquiring the temperature of a second heat exchanger corresponding to the started indoor unit;

determining a second frequency adjustment parameter of the compressor according to the second heat exchanger temperature and the target evaporation temperature;

and controlling the compressor to adjust the refrigerating frequency according to the second frequency adjusting parameter.

Optionally, the step of determining a second frequency adjustment parameter of the compressor according to the second heat exchanger temperature and the target evaporation temperature comprises:

determining a second magnitude relationship between the second heat exchanger temperature and the target evaporating temperature, and determining a second temperature deviation between the second heat exchanger temperature and the target evaporating temperature;

determining a second adjusting direction of the compressor frequency according to the second size relation, and determining a second adjusting speed of the compressor frequency according to the second temperature deviation;

determining the second adjustment direction and the second adjustment rate as the second frequency adjustment parameter.

Optionally, the second adjustment rate is on an increasing trend with increasing second temperature deviation.

Optionally, the step of determining a second adjustment direction of the compressor frequency according to the second magnitude relation includes:

when the second magnitude relation is that the second heat exchanger temperature is greater than the target evaporation temperature, determining that the second adjustment direction is increasing frequency;

and when the second magnitude relation is that the second heat exchanger temperature is lower than the target evaporation temperature, determining that the second adjusting direction is frequency reduction.

Optionally, before the step of determining a second adjustment direction of the compressor frequency according to the second magnitude relationship and determining a second adjustment rate of the compressor frequency according to the second temperature deviation, the method further includes:

comparing the second temperature deviation with a second preset threshold value;

and if the comparison result is that the second temperature deviation is greater than or equal to the second preset threshold, executing the step of determining a second adjustment direction of the compressor frequency according to the second magnitude relation and determining a second adjustment rate of the compressor frequency according to the second temperature deviation.

Optionally, the number of the opened indoor units is more than one, and the step of obtaining the temperature of the second heat exchanger corresponding to the opened indoor unit includes:

detecting the temperature of a third coil pipe of each started indoor unit, and acquiring a third rated refrigerating capacity of each started indoor unit;

determining a second weight value corresponding to each started indoor unit according to the obtained third rated refrigerating capacity;

and performing weighted average calculation operation on more than one third coil temperature according to the second weight value to obtain the second heat exchanger temperature.

Optionally, controlling a fan corresponding to the started indoor unit to operate at a rotating speed less than a third set rotating speed in the first refrigeration stage; and/or the presence of a gas and/or,

before the step of controlling the multi-split air-conditioning cooling operation according to the second parameter, the method further comprises the following steps:

when the second refrigeration stage is entered, controlling a fan corresponding to the started indoor unit to stop running for a second set time period;

controlling the fans corresponding to the started indoor units to operate at a rotating speed less than a fourth set rotating speed for a third set time period;

and executing the step of controlling the multi-split air-conditioning cold operation according to the second parameter.

Optionally, the controlling the heating operation of the multi-split air conditioner to defrost the target indoor unit includes:

acquiring the temperature of a third heat exchanger corresponding to an opened indoor unit in the heating state of the multi-split air conditioner;

determining a third frequency adjustment parameter of the compressor according to the third heat exchanger temperature and the target defrosting temperature; the target defrosting temperature is less than or equal to the set sterilization temperature;

and controlling the compressor to adjust the heating frequency according to the third frequency adjusting parameter.

Optionally, the step of determining a third frequency adjustment parameter of the compressor according to the third heat exchanger temperature and the target defrosting temperature comprises:

determining a third magnitude relationship between the third heat exchanger temperature and the target defrosting temperature, and determining a third temperature deviation between the third heat exchanger temperature and the target defrosting temperature;

determining a third adjusting direction of the compressor frequency according to the third size relation, and determining a third adjusting speed of the compressor frequency according to the third temperature deviation;

determining the third adjustment direction and the third adjustment rate as the third frequency adjustment parameter.

Optionally, the third adjustment rate is on an increasing trend with increasing third temperature deviation; and/or the presence of a gas and/or,

the step of determining a third adjustment direction of the compressor frequency according to the third magnitude relationship comprises:

when the third magnitude relation is that the third heat exchanger temperature is greater than the target defrosting temperature, determining that the third adjusting direction is to reduce the frequency;

and when the third magnitude relation is that the third heat exchanger temperature is lower than the target defrosting temperature, determining that the third adjusting direction is increasing frequency.

In addition, in order to achieve the above object, the present application also proposes an air conditioning control device including: the cleaning method comprises the steps of a memory, a processor and a cleaning program of the multi-split air conditioner, wherein the cleaning program of the multi-split air conditioner is stored on the memory and can run on the processor, and when the cleaning program of the multi-split air conditioner is executed by the processor, the cleaning method of the multi-split air conditioner is realized.

In addition, in order to achieve the above object, the present application also provides a multi-split air conditioner including:

at least two indoor units; and

the air conditioning control device described above is connected to the indoor unit.

In addition, in order to achieve the above object, the present application also proposes a computer readable storage medium having stored thereon a cleaning program of a multi-split air conditioner, which when executed by a processor, implements the steps of the cleaning method of the multi-split air conditioner as set forth in any one of the above.

The invention provides a cleaning method of a multi-split air conditioner, which is characterized in that after a target indoor unit receiving a cleaning instruction in the multi-split air conditioner with refrigeration, frosting and heating defrosting is cleaned, the air conditioner maintains heating operation and adjusts the rotating speed of a fan of the target indoor unit to enable the temperature of the target indoor unit to reach a target sterilization temperature, so that the indoor unit is sterilized by adopting a high enough temperature after the indoor unit is cleaned, bacteria can not be carried in air after heat exchange of the target indoor unit after cleaning is finished, the improvement of the cleaning effect of the indoor unit is realized, and the health of indoor users is ensured.

Drawings

FIG. 1 is a schematic diagram of a hardware configuration involved in the operation of an embodiment of the air conditioning control apparatus of the present invention;

fig. 2 is a schematic flow chart illustrating an embodiment of a method for cleaning a multi-split air conditioner according to the present invention;

fig. 3 is a schematic flow chart illustrating a cleaning method of a multi-split air conditioner according to another embodiment of the present invention;

fig. 4 is a schematic flow chart illustrating a cleaning method of a multi-split air conditioner according to another embodiment of the present invention;

FIG. 5 is a schematic flowchart illustrating a method for cleaning a multi-split air conditioner according to another embodiment of the present invention;

FIG. 6 is a schematic flow chart illustrating a cleaning method for a multi-split air conditioner according to another embodiment of the present invention;

fig. 7 is a schematic flow chart illustrating a cleaning method of a multi-split air conditioner according to still another embodiment of the present invention;

fig. 8 is a schematic flow chart illustrating a cleaning method of a multi-split air conditioner according to still another embodiment of the present invention.

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.

The main solution of the embodiment of the invention is as follows: controlling the multi-online air-conditioning cold operation to frost a target indoor unit; the target indoor unit is one of at least two indoor units which receives a cleaning instruction; controlling the heating operation of the multi-split air conditioner to defrost the target indoor unit; and when the target indoor unit is defrosted, controlling the multi-split air conditioner to maintain the heating operation, and adjusting the operation rotating speed of a fan corresponding to the target indoor unit so as to enable the temperature of the target indoor unit to reach the target sterilization temperature.

Because among the prior art, current multi-split air conditioner does not have after the cleanness is accomplished and disinfects, and the bacterium remains in indoor set easily, and the air through the indoor set heat transfer carries the bacterium, has clean effect not good, influences the problem of indoor user health.

The invention provides the solution, and aims to realize high-temperature sterilization after the indoor unit is cleaned, improve the cleaning effect and ensure that the air after heat exchange of the indoor unit can ensure the health of indoor users.

The embodiment of the invention provides a multi-split air conditioner.

In this embodiment, the multi-split air conditioner includes at least two indoor units 2 and an outdoor unit, and the outdoor unit is connected to the at least two indoor units 2. The outdoor unit is provided with a compressor 1 and an outdoor heat exchanger which are communicated with each indoor unit 2. At least two indoor units 2 are distributed in different indoor spaces. Specifically, each indoor unit 2 includes an indoor heat exchanger and an indoor fan disposed corresponding to the indoor heat exchanger, each indoor unit 2 further has an electronic expansion valve disposed in one-to-one correspondence with the indoor heat exchanger, and each electronic expansion valve is disposed between the corresponding indoor heat exchanger and the compressor 1, so as to adjust the flow rate of a refrigerant flowing into the indoor heat exchanger for heat exchange. It should be noted that the operation of each indoor unit 2 in the multi-split air conditioner can be independently controlled according to the user requirement in the indoor space where the indoor unit is located, for example, the indoor units 2 in at least two indoor units 2 can be partially opened and partially closed; as another example, at least two indoor units 2 may have the self-cleaning function partially turned on, not partially turned on, and so on.

The multi-split air conditioner can further comprise a reversing valve 3, and the reversing valve 3 can be arranged on a connecting pipeline between the indoor unit 2 and the outdoor unit so as to realize the switching of the multi-split air conditioner in different operation states of refrigeration operation and heating operation.

Further, the multi-split air conditioner may further include a temperature sensor 4 for detecting temperature data related to the operation of the multi-split air conditioner. One or more temperature sensors 4 can be arranged according to actual needs, the temperature sensors 4 can be arranged in each indoor unit 2 (such as a coil of an indoor heat exchanger) to detect the temperature of the coil corresponding to the indoor unit 2, the temperature sensors 4 can also be arranged at the air return inlet of each indoor unit 2 to detect the indoor environment temperature of the indoor space where the indoor unit 2 is located, and the temperature sensors 4 can also be arranged in the shell of the outdoor unit to detect the outdoor environment temperature, and the like.

Further, an embodiment of the present invention further provides an air conditioner control device, which is used for controlling the multi-split air conditioner.

In an embodiment of the present invention, referring to fig. 1, an air conditioning control apparatus includes: a processor 1001 (e.g., a CPU), a memory 1002, a timer 1003, and the like. The processor 1001, the memory 1002, and the timer 1003 may be connected by a communication bus. The memory 1002 may be a high-speed RAM memory or a non-volatile memory such as a disk memory. The memory 1002 may alternatively be a storage device separate from the processor 1001.

The compressor 1, the indoor unit 2, the reversing valve 3 and the temperature sensor 4 in the multi-split air conditioner can be connected with an air conditioner control device.

Those skilled in the art will appreciate that the configuration of the device illustrated in fig. 1 is not intended to be limiting of the device, and may include more or fewer components than those illustrated, or some components may be combined, or a different arrangement of components.

As shown in fig. 1, a cleaning program of the multi-split air conditioner may be included in the memory 1002 as a kind of computer readable storage medium. In the apparatus shown in fig. 1, the processor 1001 may be configured to call a cleaning program of the multi-split air conditioner stored in the memory 1002 and perform operations of relevant steps of a cleaning method of the multi-split air conditioner in the following embodiments.

The embodiment of the invention also provides a cleaning method of the multi-split air conditioner, which is applied to cleaning the multi-split air conditioner.

Referring to fig. 2, an embodiment of a method for cleaning a multi-split air conditioner of the present application is provided. In this embodiment, the method for cleaning a multi-split air conditioner includes:

step S10, controlling the multi-split air-conditioning cooling operation to frost a target indoor unit; the target indoor unit is one of at least two indoor units which receives a cleaning instruction;

when the multi-split air conditioner receives a cleaning instruction, the multi-split air conditioner can be controlled to enter a self-cleaning mode. The multi-split air conditioner may be controlled to start to perform step S10 in the self-cleaning mode. When any indoor unit of a plurality of indoor units in the multi-split air conditioner receives a cleaning instruction, the multi-split air conditioner can be controlled to enter a self-cleaning mode.

The number of the target indoor units can be set according to the actual requirement of a user, and can be one or more. Specifically, all indoor units that receive a cleaning instruction within a set time period may be identified as target indoor units. In the self-cleaning mode, other indoor units except the target indoor unit in the self-cleaning mode of the multi-split air conditioner do not need to be cleaned.

In the self-cleaning mode, the multi-split air-conditioning cooling operation can be controlled according to preset parameters or parameters determined based on the actual energy demand condition of the multi-split air conditioner, so that the target indoor unit is frosted. When the multi-split air conditioner is in cooling operation, the indoor heat exchanger in the target indoor unit is in an evaporation state, the indoor heat exchangers in other indoor units except the target indoor unit can be in an evaporation state, a heat exchange stopping state (the corresponding electronic expansion valves are closed), and even a condensation state, and the multi-split air conditioner can be specifically set according to heat exchange requirements of indoor spaces corresponding to other indoor units. The operation parameters of the multi-split air conditioner in the refrigerating operation process can be not specifically limited, and only the target indoor unit is ensured to be frosted. For example, the temperature of the indoor heat exchanger in the target indoor unit can be sufficiently low, moisture in air in the target indoor unit can be condensed and frosted on the surface of the indoor unit, and the formed frost layer can adsorb dirt in the indoor unit.

Step S20, controlling heating operation of the multi-split air conditioner to defrost the target indoor unit;

in the self-cleaning mode, after the cooling operation time of the multi-split air conditioner reaches the preset time or the temperature of the coil of the indoor unit is low enough, the target surface of the indoor unit is considered to be frosted, at the moment, the reversing valve in the multi-split air conditioner can be controlled to reverse, and the multi-split air conditioner is switched from the cooling operation to the heating operation.

When the multi-split air conditioner is in heating operation, the indoor heat exchanger of the target indoor unit can be switched to a condensation state from an evaporation state, and the indoor heat exchangers in other indoor units except the target indoor unit can be in the condensation state, can also be in a heat exchange stopping state (the corresponding electronic expansion valve is closed), and even can be in the evaporation state, and can be specifically set according to the heat exchange requirements of the indoor spaces corresponding to the other indoor units.

After the multi-split air conditioner is switched to a heating state, the heating operation of the multi-split air conditioner can be controlled according to preset parameters or parameters determined based on the actual energy demand condition of the multi-split air conditioner, so that the target indoor unit is defrosted. The operation parameters of the multi-split air conditioner in the heating operation process can be not specifically limited, and only the frost layer of the target indoor unit is guaranteed to be melted. For example, the indoor heat exchanger in the target indoor unit releases heat to the frost layer to melt the frost layer, and dirt in the target indoor unit is melted after the frost layer is melted by operating the fan corresponding to the target indoor unit and/or operating the fans corresponding to all the indoor units at a low rotation speed which is less than a set rotation speed or even turning off the fans, operating the compressor at a high frequency which is greater than a set frequency, operating the electronic expansion valve corresponding to the target indoor unit at a large opening which is greater than a third set opening and/or operating the electronic expansion valve corresponding to the indoor unit except the target indoor unit at a small opening which is less than a fourth set opening (the third set opening is greater than or equal to the fourth set opening).

And step S30, when the defrosting of the target indoor unit is finished, controlling the multi-split air conditioner to maintain the heating operation, and adjusting the operation rotating speed of a fan corresponding to the target indoor unit so as to enable the temperature of the target indoor unit to reach the target sterilization temperature.

The target sterilization temperature specifically refers to a target value of the temperature of the coil of the indoor unit, which enables bacteria to survive in the temperature environment for no more than a preset time. The target sterilization temperature is higher than a certain temperature value. Specifically, in the present embodiment, the target sterilization temperature is 56 degrees celsius. In other embodiments, the target sterilization temperature may be set to other temperatures, such as 60 degrees celsius, 70 degrees celsius, or 80 degrees celsius, etc., as desired

The preset time period can be set according to actual requirements, for example, 3s, 5s and the like. The target sterilization temperature can be a fixed parameter preset by the system, a parameter set by a user, or a parameter selected from a plurality of parameters preset by the system based on the actual operation condition of the multi-split air conditioner.

In the heating operation process of the multi-split air conditioner, the operation parameters (such as heating time, coil temperature of the indoor unit and the like) of the multi-split air conditioner can be monitored, when the operation parameters are monitored to reach defrosting finish conditions, the target indoor unit can be considered to be defrosted completely, and the multi-split air conditioner can be controlled to maintain heating operation.

In the process of maintaining heating of the multi-split air conditioner, the running rotating speed of a fan of a target indoor unit can be adjusted by taking the target sterilization temperature as a target. The adjustment mode of the fan rotating speed of the target indoor unit specifically includes increasing the rotating speed, decreasing the rotating speed or maintaining the current rotating speed. Specifically, adjustment parameters (such as an adjustment direction, an adjustment amplitude and/or an adjustment rate) of the running rotation speed of the fan of the target indoor unit can be determined according to the temperature parameter representing the current temperature condition of the target indoor unit and the target sterilization temperature, and the running rotation speed of the fan of the target indoor unit is adjusted according to the determined adjustment parameters, so that the temperature of the corresponding target indoor unit after the fan rotation speed is adjusted is closer to the temperature range where the target sterilization temperature is located than the temperature of the target indoor unit before the adjustment. In the process of adjusting the rotating speed of the target indoor unit fan, the fans in the compressor, the electronic expansion valve and other opened indoor units can operate according to preset fixed parameters, and can also operate based on parameters determined by actual conditions in the sterilization process.

Before the rotating speed operation of the fan corresponding to the target indoor unit is adjusted, when defrosting of the target indoor unit is completed, the fan corresponding to the target indoor unit is controlled to operate at a set initial rotating speed, so that the rotating speed is further regulated and controlled after system pressure is stable, and the stability of operation of the air conditioning system is ensured.

Further, in this embodiment, in the process of executing step S30, it may be further determined that, of the turned-on indoor units, indoor units other than the target indoor unit are other indoor units; controlling fans corresponding to the other indoor units to be closed, and controlling the opening degrees of the electronic expansion valves corresponding to the other indoor units to be reduced; and when the opening degree of the electronic expansion valve is reduced, the refrigerant quantity of other indoor units is reduced. The electronic expansion valve can be specifically arranged at the refrigerant inlets of the indoor heat exchangers of other indoor units, the opening degree of the electronic expansion valve is reduced, the amount of high-temperature refrigerants flowing into other indoor units can be reduced, meanwhile, fans of other indoor units are turned off, and therefore heat exchange between other indoor units and the air in the indoor space where the indoor units are located is suspended, more high-temperature refrigerants enter the heat exchanger of the target indoor unit in the heating state of the multi-split air conditioner to improve the temperature of the target indoor unit, the higher target sterilization temperature can be quickly reached for sterilization, and the sterilization effect of the target indoor unit is improved.

And after defrosting of the target indoor unit is finished, monitoring the operating parameters of the multi-split air conditioner related to the sterilization process of the target indoor unit in the process of adjusting and realizing sterilization based on the fan of the target indoor unit in the heating state, and when the monitored operating parameters reach sterilization finishing conditions, considering that sterilization of the target indoor unit is finished. When the sterilization of the target indoor unit is finished, the multi-split air conditioner can be controlled to enter an air supply mode, the fan of the target indoor unit operates at a rotating speed which is greater than or equal to a set rotating speed in the air supply mode, and when the operation of the air supply mode reaches a set time, the multi-split air conditioner can be controlled to exit from a self-cleaning mode and recover to normal operation. And fans of other indoor units except the target indoor unit in the air supply mode can be turned on or turned off according to actual requirements.

According to the cleaning method of the multi-split air conditioner, after a target indoor unit receiving a cleaning instruction in the multi-split air conditioner with refrigeration and defrosting functions is cleaned, the air conditioner maintains heating operation and adjusts the rotating speed of a fan of the target indoor unit, so that the temperature of the target indoor unit reaches a target sterilization temperature, the indoor unit is sterilized at a high enough temperature after being cleaned, the air subjected to heat exchange by the target indoor unit after cleaning is prevented from carrying bacteria, the cleaning effect of the indoor unit is improved, and the health of indoor users is ensured.

Specifically, in the present embodiment, before step S30, the process of acquiring the target sterilization temperature is as follows: acquiring the outdoor environment temperature; and acquiring the target sterilization temperature according to the outdoor environment temperature. Different outdoor environment temperatures correspond to different target sterilization temperatures. The corresponding relation between the outdoor environment temperature and the target sterilization temperature can be preset and can be in the forms of a calculation formula, a mapping relation and the like. Wherein the target sterilization temperature is in a decreasing trend along with the decrease of the outdoor environment temperature.

For example, in the present embodiment, the correspondence between the outdoor ambient temperature and the target sterilization temperature is as shown in the following table:

outdoor ambient temperature T4	Target sterilization temperature
		T4≤T4a	T2_targetheat2_1
T4a＜T4≤T4b	T2_targetheat2_2
		T4＞T4b	T2_targetheat2_3

In the above table, T4a and T4b are preset critical values of the temperature range, T4a < T4 b. The outdoor environment temperature is in different temperature intervals, and the target sterilization temperature has different values. T2_ targetat 2_1< T2_ targetat 2_2< T2_ targetat 2_ 3.

Different outdoor environment temperatures are correspondingly sterilized by different target sterilization temperatures, so that the sterilization process of the multi-split air conditioner can be accurately matched with the operation working condition where the multi-split air conditioner is located, and the reliable operation of the multi-split air conditioner under the current working condition is ensured while the sterilization effect is ensured.

Further, based on the above embodiments, another embodiment of the cleaning method of the multi-split air conditioner of the present application is provided. In this embodiment, referring to fig. 3, the step of adjusting the operation rotation speed of the fan corresponding to the target indoor unit includes:

step S31, acquiring a first coil temperature of the target indoor unit, and acquiring a temperature threshold corresponding to the target sterilization temperature;

the temperature of the first coil pipe can be detected through a temperature sensor arranged in the middle of the coil pipe of the target indoor unit. The temperature threshold is specifically a numerical value determined according to the target sterilization temperature, and if the target sterilization temperature is different, the corresponding temperature thresholds are different. The temperature threshold can be one or more than one according to actual requirements, and the temperature threshold can be equal to the target sterilization temperature, can also be smaller than the target sterilization temperature, and can also be larger than the target sterilization temperature.

Step S32, determining a rotation speed adjusting parameter according to the first coil temperature and the temperature threshold;

the rotation speed adjusting parameters specifically include an adjusting direction, an adjusting amplitude and/or an adjusting speed of the rotation speed.

Different first coil temperatures and different target sterilization temperature compressor rotation speed adjustment parameters. The corresponding relation among the first coil temperature, the target sterilization temperature and the rotating speed adjusting parameter can be preset and can have the forms of a calculation formula, a mapping relation and the like. Specifically, the first coil temperature and the target sterilization temperature have different quantitative relationships (such as magnitude relationship, temperature deviation, ratio, and the like), and different rotation speed adjustment parameters can be correspondingly provided. Based on the preset corresponding relation, the rotating speed adjusting parameter of the fan of the target indoor unit corresponding to the current first coil temperature and the target sterilization temperature can be determined.

In this embodiment, the temperature threshold includes a first temperature threshold, and the first temperature threshold is smaller than the target sterilization temperature, specifically, a temperature value smaller than the target sterilization temperature by a first set value may be used as the first temperature threshold, for example, if the target sterilization temperature is T1, the first temperature threshold is T-a. The rotation speed adjusting parameters comprise a rotation speed adjusting direction, and the step of determining the rotation speed adjusting parameters according to the first coil temperature and the temperature threshold comprises the following steps: when the first coil temperature is lower than the first temperature threshold value, determining that the rotating speed adjusting direction is a reduced rotating speed. When the actual coil temperature of the target indoor unit is lower than the target sterilization temperature and is lower than the first temperature threshold value, the temperature of the target indoor unit is too low, the quantity of heat conveyed to the indoor space by the target indoor unit can be reduced by reducing the rotating speed of the fan, more heat is reserved in the target indoor unit, the temperature of the target indoor unit can be further increased, and therefore the high-temperature sterilization effect of the target indoor unit is guaranteed.

Further, in this embodiment, the temperature threshold further includes a second temperature threshold, and the second temperature threshold is greater than the target sterilization temperature, specifically, a temperature value greater than the target sterilization temperature by a second set value may be used as the second temperature threshold, for example, if the target sterilization temperature is T2, the second temperature threshold is T + b. The step of determining a rotation speed adjustment parameter according to the first coil temperature and the temperature threshold further includes: when the first coil temperature is greater than the second temperature threshold, determining that the rotating speed adjusting direction is an increasing rotating speed. When the temperature of the first coil pipe is higher than the target sterilization temperature and higher than the second temperature threshold, the temperature of the target indoor unit is over high, the continuous operation may cause the multi-split air conditioner to have a reliability risk, and the rotating speed is increased at the moment to prevent the target indoor unit from further rising, so that the multi-split air conditioner can reliably operate while the target indoor unit is cleaned and sterilized.

When the temperature of the first coil pipe is between the first temperature threshold and the second temperature threshold, the fact that the current multi-split air conditioner can effectively achieve sterilization and reliable operation is shown, and the fan of the target indoor unit can be controlled to maintain the current rotating speed to operate.

Here, the fan speed of the target indoor unit is timely regulated and controlled when the temperature of the target indoor unit is too low or too high by comparing the first temperature threshold and the second temperature threshold determined based on the target sterilization temperature with the coil temperature of the target indoor unit, so as to ensure that the temperature of the target indoor unit can be maintained in the temperature range of the target sterilization temperature, and the air conditioning system can reliably operate while achieving the sterilization effect of the target indoor unit, and in this embodiment, the fan speed of the target indoor unit is not directly regulated and controlled based on the magnitude relation between the coil temperature and the target sterilization temperature, but the fan speed is regulated and controlled by adopting the magnitude relation between the first temperature threshold and the second temperature threshold which have a certain deviation from the target sterilization temperature and the coil temperature, so that the fan speed of the target indoor unit is regulated when the deviation between the coil temperature and the target sterilization temperature is large, the frequent adjustment of the rotating speed can be effectively avoided, and the running stability of the multi-split air-conditioning system is ensured.

For example, in the process of defining the coil temperature of the target indoor unit as T2, the target sterilization temperature as T2_ targethat 2, the first temperature threshold determined based on the target sterilization temperature as T2_ targethat 2-4, and the second temperature threshold determined based on the target sterilization temperature as T2_ targethat 2+2, and adjusting the fan rotation speed of the target indoor unit based on the temperature thresholds corresponding to the coil temperature and the target sterilization temperature, the rotation speed adjustment parameter may be determined according to the following relationship:

if T2 is less than T2_ targethat 2-4, reducing the wind speed of the fan by a gear delta N1;

if T2_ targethat 2-4 is not less than T2 and is less than T2_ targethat 2+2, the wind speed of the fan is kept unchanged;

if T2 is larger than or equal to T2_ targethat 2+2, the wind speed of the fan is increased by a gear delta N2.

It should be noted that, in other embodiments, the temperature threshold may also be equal to the target sterilization temperature, and when the coil temperature of the target indoor unit is less than the target sterilization temperature, the fan of the target indoor unit is controlled to reduce the rotation speed to operate; and when the temperature of the coil pipe of the target indoor unit is higher than the target sterilization temperature, controlling the fan of the target indoor unit to increase the rotating speed to operate.

And step S33, adjusting the running speed of the fan corresponding to the target indoor unit according to the speed adjusting parameter.

When the rotating speed adjusting parameter comprises a rotating speed adjusting direction, in the process of adjusting the rotating speed of the fan of the target indoor unit according to the rotating speed adjusting direction, the rotating speed of the fan of the target indoor unit can be adjusted according to a preset rotating speed adjusting rate or rotating speed adjusting amplitude, and in addition, the rotating speed of the fan can be adjusted by determining a corresponding rotating speed adjusting rate or rotating speed adjusting amplitude according to the operating conditions (such as the current operating frequency of a compressor and the like) of the air conditioner in the sterilization process.

In the embodiment, the rotating speed of the target indoor unit is regulated and controlled by the rotating speed regulation parameter determined by combining the coil temperature of the target indoor unit and the indoor threshold value corresponding to the target sterilization temperature, so that the accuracy of the determined rotating speed regulation parameter in regulating and controlling the wind speed of the target indoor unit is ensured, the sterilization effect of the target indoor unit is ensured, and the reliable operation of the multi-split air conditioner is ensured.

Further, based on any of the above embodiments, another embodiment of the cleaning method for the multi-split air conditioner of the present application is provided. In this embodiment, referring to fig. 4, before the step of controlling the multi-split air conditioner to maintain the heating operation and adjusting the operation rotation speed of the fan corresponding to the target indoor unit so that the temperature of the target indoor unit reaches the target sterilization temperature, the method further includes:

step S01, when the defrosting of the target indoor unit is finished, the outdoor environment temperature and the indoor environment temperature are obtained;

step S02, determining whether the outdoor ambient temperature satisfies a first temperature condition and whether the indoor ambient temperature satisfies a second temperature condition; the first temperature condition is that the outdoor environment temperature is smaller than a first set temperature and is greater than or equal to a second set temperature, the second temperature condition is that the indoor environment temperature is smaller than the first set temperature and is greater than or equal to a third set temperature, and the third set temperature is greater than the second set temperature.

Here, specific magnitudes of the first set temperature, the second set temperature, and the third set temperature may be determined according to actual conditions of the multi-split air conditioner during a cleaning process (for example, the number of currently turned on indoor units, the duration of heating operation, and the like), or may be preset according to types, numbers, and rated capacities of components in a refrigerant system of the multi-split air conditioner.

When the outdoor ambient temperature satisfies a first temperature condition and the indoor ambient temperature satisfies a second temperature condition, performing step S30a in the above step S30; when the outdoor ambient temperature does not satisfy the first temperature condition, or when the indoor ambient temperature does not satisfy the second temperature condition, step S40 is performed.

Step S30a, adjusting the running speed of a fan corresponding to the target indoor unit to enable the temperature of the target indoor unit to reach the target sterilization temperature;

and step S40, controlling the compressor to stop, and controlling the fan corresponding to the target indoor unit to operate at a rotating speed greater than a first set rotating speed.

Here, step S40 indicates that the multi-split air conditioner enters the air blowing mode operation. Specifically, after the compressor is stopped, the fans corresponding to the target indoor unit may operate at a rotation speed greater than a first set rotation speed, the fans corresponding to the target indoor unit and all the turned-on fans of the indoor units may operate at a rotation speed greater than the first set rotation speed, or all the fans of the indoor units may operate at a rotation speed greater than the first set rotation speed. The magnitude of the first set rotating speed can be set according to actual conditions, and the first set rotating speed is 60% of the maximum operating rotating speed of the fan of the target indoor unit in the embodiment. Specifically, after the compressor is stopped, the multi-split air conditioner can be controlled to exit the self-cleaning mode at least after the fan of the target indoor unit runs for a certain time (for example, 2min) at a rotating speed which is higher than a first set rotating speed.

In the embodiment, after defrosting is finished in the cleaning process of the target indoor unit, before the target indoor unit is sterilized based on fan rotating speed regulation, sterilization operation is performed on the target indoor unit when indoor and outdoor environment temperatures are ensured to be within a set temperature range, sterilization operation is not performed on the target indoor unit when any indoor and outdoor environment temperature is not within the corresponding set temperature range, but the target indoor unit enters an air supply mode to dry the target indoor unit when the compressor is stopped, so that the problem of reliability of high-temperature operation of a heat exchanger of the target indoor unit of a multi-split air conditioner under the condition of poor working condition is effectively solved, and the reliability of operation of the air conditioner is ensured while cleaning and sterilizing the target indoor unit.

Further, based on any of the above embodiments, a further embodiment of the cleaning method for the multi-split air conditioner is provided. In this embodiment, referring to fig. 5, in the process of executing step S30, the method further includes:

step S301, judging whether the multi-split air conditioner meets a first sterilization finishing condition or a second sterilization finishing condition;

and when the multi-split air conditioner satisfies the first sterilization end condition or the second sterilization end condition, and when the multi-split air conditioner does not satisfy the first sterilization end condition or the second sterilization end condition, executing step S303.

Step S302, controlling a compressor to stop, and controlling a fan corresponding to the indoor unit to operate at a rotating speed greater than a second set rotating speed;

step S303, the operation frequency of the compressor is kept and adjusted to enable the temperature of the target indoor unit to reach the target sterilization temperature;

the first sterilization ending condition is that the duration of heating operation of the multi-split air conditioner is less than or equal to a target sterilization duration, the second sterilization ending condition is that the temperature of the indoor unit is greater than or equal to a preset temperature and the preset duration is maintained, the preset duration is less than the target sterilization duration, and the preset temperature is greater than the target sterilization temperature.

It should be noted that, in the present embodiment, steps S301 to S303 are executed synchronously with step S30, and step S301 may be executed at intervals of a set duration in the process of adjusting the frequency of the compressor.

The duration of the heating operation duration specifically refers to the sum of the duration of the defrosting process and the duration of the sterilizing process after defrosting is finished, wherein the duration is set when the air conditioner starts heating after defrosting is finished.

The second set rotation speed is a preset parameter, and the specific size of the second set rotation speed can be set according to actual conditions. Specifically, in this embodiment, the second set rotation speed is 60% of the maximum operation rotation speed of the fan, and when the air conditioner reaches the first sterilization end condition or the second sterilization end condition, the compressor is stopped, and the fan corresponding to the indoor unit operates at 60% of the maximum rotation speed of the fan. The fans of the opened indoor units operate at a rotation speed greater than or equal to a second set rotation speed, or the fans of the limited target indoor units in the opened indoor units operate at a rotation speed greater than or equal to the second set rotation speed, and the fans of other indoor units can operate according to actual air outlet requirements.

The specific value of the target sterilization duration can be set according to actual conditions, can be a preset fixed parameter, and can also be set based on the actual operation condition of the air conditioner in the cleaning process.

Specifically, in this embodiment, the target sterilization duration is obtained as follows: when defrosting of the target indoor unit is finished, adjusting the operating frequency of a compressor to enable the temperature of the target indoor unit to reach a target sterilization temperature, and before step S301, obtaining operating state parameters of the multi-split air conditioner; if the running state parameter indicates that no outdoor unit defrosting operation and compressor oil return operation exist after the target indoor unit defrosting of the multi-split air conditioner is finished, acquiring a first time length as the target sterilization time length; if the running state parameter indicates that outdoor unit defrosting operation or compressor oil return operation exists after the target indoor unit defrosting of the multi-split air conditioner is finished, acquiring a second time length as the target sterilization time length; wherein the second duration is greater than the first duration. The specific values of the first duration and the second duration may be set according to actual conditions, and in this embodiment, the first duration and the second duration are fixed parameters that are set in advance, for example, the first duration is 70min, and the second duration is 100 min. In other embodiments, the first time period and the second time period may also be determined according to an actual operation process of the air conditioner after defrosting of the air conditioner is completed.

In the embodiment, when the heating time of the air conditioner is long enough or the indoor unit is maintained at a higher temperature for a longer time, the air conditioner can achieve a better sterilization effect, and if the air conditioner is continuously heated and operated, the cleaning efficiency is influenced, even the reliability of the air conditioner is caused, so that when the air conditioner meets a first sterilization finishing condition or a second sterilization finishing condition, the compressor is stopped when the air conditioner is in air conditioning, the fan supplies air at a higher air speed, the drying and the rapid cooling of a target indoor unit are facilitated, and the operation reliability of the multi-split air conditioner is improved while the cleaning effect of the target indoor unit is improved; and when the air conditioner does not meet the first sterilization finishing condition and the second sterilization finishing condition, the air conditioner keeps adjusting the frequency of the compressor so as to ensure the sterilization effect.

Further, based on any one of the above embodiments, the present application also provides another two embodiments of a cleaning method for a multi-split air conditioner, in this embodiment, in the process of step S30, the method further includes:

and step S50, adjusting the running frequency of the compressor to enable the temperature of the target indoor unit to reach the target sterilization temperature.

It should be noted that the execution sequence of step S50, step S301 and step S31 is not limited in particular, and may be executed synchronously or sequentially according to actual requirements.

In the process of maintaining the heating of the multi-split air conditioner, the operating frequency of the compressor can be adjusted by taking the target sterilization temperature as a target. The adjustment of the operating frequency of the compressor may specifically comprise increasing the frequency, decreasing the frequency or maintaining the current frequency. Specifically, adjustment parameters (such as an adjustment direction, an adjustment amplitude and/or an adjustment rate) of the operation frequency of the compressor can be determined according to the temperature parameter representing the current temperature condition of the target indoor unit and the target sterilization temperature, and the operation frequency of the compressor is adjusted according to the determined adjustment parameters, so that the temperature of the target indoor unit after the frequency of the compressor is adjusted is closer to a temperature interval reaching the target sterilization temperature than the temperature of the target indoor unit before the frequency of the compressor is adjusted.

The temperature of the target indoor unit reaches the target sterilization temperature by combining the matching regulation and control of the frequency of the compressor and the rotating speed of the fan, so that the regulation and control are more accurate, the reliable operation of the whole multi-split air-conditioning system is realized while the cleaning and sterilization effects are better.

Specifically, in this embodiment, referring to fig. 6, the step of adjusting the operating frequency of the compressor includes:

step S51, acquiring the temperature of a first heat exchanger corresponding to the opened indoor unit;

the first heat exchanger temperature is specifically a temperature representing the temperature condition of the turned-on indoor unit, and may be one temperature value obtained based on one detected coil temperature value, or one temperature value obtained by calculation or screening based on a plurality of detected coil temperatures.

In the process of cleaning the target indoor unit, the indoor units in the multi-split air conditioner except the target indoor unit can be turned on or off according to the actual requirements of users. Based on the temperature, the coil temperature of each turned-on indoor unit in the multi-split air conditioner can be obtained, and the first heat exchanger temperature is determined based on the obtained coil temperature. The obtained coil temperature quantity is less than or equal to the quantity of the turned-on indoor units.

In this embodiment, in order to ensure that the determined operating frequency of the compressor can achieve the cleaning of the target indoor unit and meet the heat exchange requirement in the space where other opened indoor units are located, the obtained number of the temperatures of the coil pipes is the same as the number of the opened indoor units. Specifically, when the number of turned-on indoor units including the target indoor unit is one, the first heat exchanger temperature specifically refers to the coil temperature of the target indoor unit. When the number of the started indoor units including the target indoor unit is more than one, detecting the temperature of a second coil of each started indoor unit; determining the first heat exchanger temperature from more than one of the second coil temperatures. Here, the first heat exchanger temperature may be specifically determined by screening, calculating, and the like, from the acquired temperatures of the plurality of coils. For example, the temperature with the lowest temperature among the plurality of coil temperatures may be determined as the first heat exchanger temperature, the median of the plurality of coil temperatures may also be determined as the first heat exchanger temperature, and the first heat exchanger temperature may also be calculated according to a set rule (e.g., an average value, etc.) by the plurality of coil temperatures.

Specifically, in order to further improve the accuracy of the frequency regulation of the compressor and further improve the consideration effect of meeting the requirements of cleaning and heat exchange of different indoor spaces, in this embodiment, the temperature of the second coil of each started indoor unit is detected, and the first rated refrigerating capacity of each started indoor unit is obtained; determining a first weight value corresponding to each started indoor unit according to the obtained first rated refrigerating capacity; and performing weighted average calculation operation on more than one second coil temperature according to the first weight value to obtain the first heat exchanger temperature. The first rated refrigerating capacity specifically refers to the refrigerating capacity of the indoor unit measured under the rated working condition. The first weighted value of each turned-on indoor unit is a ratio of the first rated cooling capacity of the turned-on indoor unit to the sum of the first rated cooling capacities of all turned-on indoor units. For example, there are x internal machines currently in need, where the nominal capacity of each internal machine is n1, n2, n3 … … nx, respectively, and the coil temperature of the indoor heat exchanger of each internal machine is T1, T2, T3 … … Tx, then the first heat exchanger temperature T ═ is (n1 × T1+ n2 × T2+ n3 × T3+ … … nx Tx)/(n1+ n2+ n3+ … … + nx).

Step S52, determining a first frequency adjustment parameter of the compressor according to the first heat exchanger temperature and the target sterilization temperature;

the first frequency adjustment parameter specifically includes an adjustment direction, an adjustment amplitude, and/or an adjustment rate.

A first frequency adjustment parameter for the compressor for different first heat exchanger temperatures and different target sterilization temperatures. The corresponding relation among the first heat exchanger temperature, the target sterilization temperature and the frequency adjustment parameter can be preset and can have the forms of a calculation formula, a mapping relation and the like. Specifically, the number relationship between the temperature of the first heat exchanger and the target sterilization temperature is different (such as a magnitude relationship, a temperature deviation, a ratio, and the like), and different frequency adjustment parameters may be provided correspondingly. And determining the frequency adjustment parameters of the compressor corresponding to the current temperature of the first heat exchanger and the target sterilization temperature based on the preset corresponding relation.

In this embodiment, the first frequency adjustment parameter includes a first adjustment direction, and the determination process of the first adjustment direction specifically includes the following steps: determining a first magnitude relationship between the first heat exchanger temperature and the target sterilization temperature; when the first magnitude relation is that the first heat exchanger temperature is higher than the target sterilization temperature, determining that the first adjusting direction is reducing frequency; when the first magnitude relation is that the first heat exchanger temperature is lower than the target sterilization temperature, determining that the first adjusting direction is increasing frequency. The adjustment rate and/or the adjustment amplitude of the frequency during the process of increasing or decreasing the frequency may be fixed parameters set in advance, or may be determined according to the actual operation condition information of the air conditioner (for example, the adjustment rate is determined in a manner mentioned later). Here, when the temperature of the first heat exchanger is higher than the target sterilization temperature, it indicates that the overall temperature of the indoor unit in which the multi-split air conditioner is turned on is relatively high, and a reliability problem is likely to occur in the current working condition, so that the reliable operation of the air conditioner is ensured while sterilization is achieved by reducing the frequency. When the first coil characteristic parameter temperature is lower than the target sterilization temperature, the integral temperature of the started indoor unit of the multi-split air conditioner is low, and the temperature of the target indoor unit is not enough to kill bacteria in the indoor unit, so that the temperature of the target indoor unit is increased by increasing the frequency, and the sterilization effect is effectively improved.

Further, in order to ensure the accuracy of the frequency regulation of the compressor and ensure the stable operation of the multi-split air conditioning system, before increasing or decreasing the frequency of the compressor based on the first magnitude relation, a first temperature deviation between the temperature of the first heat exchanger and the target sterilization temperature may be determined; when the first temperature deviation is larger than or equal to a first preset threshold value, executing the step of determining a first magnitude relation between the first heat exchanger temperature and the target sterilization temperature; and when the first temperature deviation is smaller than a first preset threshold value, controlling the compressor to maintain the current frequency operation. Specifically, the range of the first preset threshold value can be set according to actual requirements, in this embodiment, the range of the first preset threshold value is 1 degree celsius, and in other embodiments, the first preset threshold value can also be set to 1.5 degrees celsius, 2 degrees celsius, 3 degrees celsius, and the like. In this embodiment, through the setting of first preset threshold value, when the deviation of first heat exchanger temperature and target sterilization temperature is great, just adjust the compressor frequency of off-premises station, can effectively avoid the frequent adjustment of compressor frequency, guarantee the stability of the whole operation of multi-connected air conditioner.

Further, for further accuracy of the compressor frequency regulation, the first frequency adjustment parameter further includes a first adjustment rate, and based on this, in the process of determining the first adjustment direction, the method further includes: determining the first adjustment rate according to a first temperature deviation between the first heat exchanger temperature and the target sterilization temperature; wherein the first adjustment rate trends as the temperature deviation increases. The corresponding relationship between the first temperature deviation and the first adjustment rate may be preset, and may have the form of a calculation formula, a mapping relationship, or the like. For example, the first temperature deviation corresponds to different first adjustment rates when the first temperature deviation is in different temperature difference intervals. In this embodiment, the adjustment rate of the compressor is determined by combining the first temperature deviation, so that the adjustment rate of the frequency can be ensured to be matched with the temperature deviation condition between the temperature of the first heat exchanger and the target sterilization temperature when the frequency is reduced or increased, and the temperature of the target indoor unit can be ensured to quickly reach the temperature interval where the target sterilization temperature is located by adjusting the frequency.

Further, in order to ensure that the frequency control can ensure the sterilization effect of the target indoor unit, in this embodiment, the first adjustment directions are different, and the corresponding numerical ranges of the first adjustment rates are different. Specifically, a numerical range of a first adjustment rate corresponding to the case where the first adjustment direction is increasing the frequency is defined as a first rate range, a numerical range of the first adjustment rate corresponding to the case where the first adjustment direction is decreasing the frequency is defined as a second rate range, and a rate in the first rate range is greater than a rate in the second rate range. Based on this, after the first adjustment direction is determined, the first adjustment rate is determined, a numerical range corresponding to the first adjustment rate is obtained based on the first adjustment direction, when the first adjustment direction is the increase frequency, the first adjustment rate of the compressor is determined according to the first temperature deviation or other manners (such as the fan rotating speed of the target indoor unit) in the first rate range, and the first adjustment rate of the compressor is determined according to the first temperature deviation or other manners (such as the fan rotating speed of the target indoor unit) in the second range. Specifically, in this embodiment, when the first adjustment direction is increasing frequency, the first adjustment rate is determined according to the first temperature deviation within a first rate range; and when the second adjusting direction is the frequency reduction, determining the first adjusting speed according to the first temperature deviation in a second speed range. The frequency needs to be increased and adjusted at a higher rate, so that the temperature of the target indoor unit can be quickly increased to be higher than the target sterilization temperature, and the target indoor unit can be sterilized at a high enough temperature; when the frequency needs to be reduced, the frequency is adjusted at a lower rate, which is beneficial to maintaining the target indoor unit at a high enough temperature for a longer time so as to improve the sterilization effect of the target indoor unit.

The first temperature deviation in this embodiment refers to an absolute value of a difference between the first heat exchanger temperature and the target sterilization temperature. The target sterilization temperature in this embodiment may be obtained in the manner mentioned in the above embodiments, which is not described in detail herein.

And step S53, controlling the compressor to adjust the operating frequency according to the first frequency adjustment parameter.

Specifically, when the first frequency adjustment parameter includes the adjustment direction, the current operation frequency of the compressor is increased or decreased according to the adjustment direction; the first frequency adjustment parameter further includes increasing or decreasing a current operating frequency of the compressor in accordance with the adjustment rate when the adjustment rate is included.

When the adjustment direction of the compressor frequency is determined according to the first magnitude relation in the present embodiment, the adjustment frequency of the compressor may be determined in other manners besides the first temperature deviation; the adjustment direction of the compressor frequency can also be determined in other ways than the adjustment frequency of the compressor determined according to the first temperature deviation in the present embodiment.

Specifically, in this embodiment, the first heat exchanger temperature is defined as T2_ avg, and the target sterilization temperature is defined as T2_ target the 2, and the process of determining the compressor frequency adjustment parameter based on the first heat exchanger temperature and the target sterilization temperature may specifically be determined in the following manner:

1) t2_ avg-T2_ targetthe at2 > 2, the compressor frequency is decreased at a rate of 2Hz per 30 seconds;

2) 1< T2_ avg-T2_ targethat 2 is less than or equal to 2, and the frequency of the compressor is reduced at the speed of 1Hz per 60 seconds;

3) -1 < T2_ avg-T2_ targethat 2 ≦ 1, the compressor frequency remaining unchanged;

4) -3 < T2_ avg-T2_ targethat 2 ≦ 1, the compressor frequency increasing at a rate of 1Hz per 120 seconds;

5) t2_ avg-T2_ targethat 2 ≦ -3, and the compressor frequency is ramped up at 2Hz per 90 seconds.

In this embodiment, the temperature of the first heat exchanger of the turned-on indoor unit may represent the actual load conditions of all turned-on indoor units of the multi-split air conditioner including the target indoor unit at present, and based on this, the frequency adjustment parameter of the compressor is determined by combining the temperature of the heat exchanger and the target sterilization temperature, so that the accuracy of the determined frequency adjustment parameter in regulating and controlling the compressor is ensured, and the reliable operation of the multi-split air conditioner is ensured while the sterilization effect of the target indoor unit is ensured.

Further, based on any one of the above embodiments, the present application further provides a third embodiment of a cleaning method for a multi-split air conditioner, and in this embodiment, a refrigeration frosting process of the multi-split air conditioner sequentially includes a first refrigeration stage and a second refrigeration stage. The first refrigeration stage and the second refrigeration stage can be divided based on a preset time length, and can also be determined according to the actual operation condition of the air-conditioning refrigeration process. Specifically, in this embodiment, in the first refrigeration stage, if the multi-split air conditioner reaches a condensation completion condition, the multi-split air conditioner is controlled to enter the second refrigeration stage; the condensation completing condition comprises that the time length of the multi-split air conditioner running with the first parameter is longer than or equal to a first set time length or the coil temperature of the target indoor unit is smaller than or equal to a first set temperature. The specific values of the first set time and the first set temperature can be set according to actual conditions. When the air conditioner runs for a long enough time with the first parameter or the coil temperature of the target indoor unit is low enough, the air conditioner forms enough sleep on the surface of the target indoor unit in the first refrigeration stage to cover dirt, and then enters the second refrigeration stage in time to frost so as to improve the cleaning efficiency.

On this basis, based on the division of the condensation stage and the frost stage in the cooling operation process by the cleaning process, the step S10 includes:

step S11, in the first refrigeration stage, controlling the multi-split air-conditioning refrigeration operation according to a first parameter so as to condense the target indoor unit;

the first parameter specifically refers to an operation parameter of any refrigeration component in the air conditioner, which can make a target indoor unit condense, and specifically, the first parameter may include parameters such as a compressor frequency, a fan rotation speed, and an opening degree of an electronic expansion valve. The specific numerical value and the type of the first parameter can be set according to actual conditions, and only the condensation of the target indoor unit needs to be guaranteed.

Specifically, in this embodiment, the first parameter includes a target frequency of the compressor, and referring to fig. 7, step S11 includes:

step S111, in the first refrigeration stage, obtaining a second rated refrigeration capacity of the target indoor unit, and obtaining a third rated refrigeration capacity of the compressor;

the second nominal cooling capacity here refers in particular to the cooling capacity of the indoor unit measured at nominal operating conditions. The third rated cooling capacity specifically refers to the output capacity of the compressor measured at the rated cooling condition. And when the number of the target indoor units is more than one, the second rated cooling capacity is the sum of the rated cooling capacities of all the target indoor units.

Step S112, determining a frequency correction parameter according to the numerical relationship between the second rated refrigerating capacity and the third rated refrigerating capacity;

the numerical relationship between the second rated refrigerating capacity and the third rated refrigerating capacity specifically includes a difference, a ratio or a sum of the second rated refrigerating capacity and the third rated refrigerating capacity. The different numerical relationships correspond to different frequency correction parameters, and the frequency correction parameters may specifically include a correction amplitude, a correction rate, and/or a correction direction.

Step S113, determining the target frequency according to the set maximum frequency of the multi-split air-conditioning cold operation and the frequency correction parameter;

specifically, the difference between the set maximum frequency and the frequency correction parameter may be used as the target frequency; and setting the result of reducing the set maximum frequency according to the frequency correction parameter as a proportion as a target frequency.

In this embodiment, the ratio of the second rated cooling capacity to the third rated cooling capacity is used as the frequency correction parameter, and the product of the set maximum frequency and the frequency correction parameter is used as the target frequency. For example, the target frequency of the operation of the outdoor unit compressor is calculated as follows: if one 56 and one 22 in a 2-by-one system receive the self-cleaning type, the target frequency of the outdoor compressor is the maximum cooling frequency (56+ 22)/160.

And step S114, controlling the compressor to perform cooling operation at the target frequency.

The frequency obtained by correcting the maximum frequency of the compressor by corresponding correction parameters is determined by integrating the refrigerating capacity of the indoor unit to be cleaned and the output capacity of the compressor and is used as the operating frequency of the air conditioner at the condensation stage, so that the indoor unit to be cleaned can be rapidly condensed, and the cleaning efficiency of the target indoor unit can be improved.

Further, before step S114, the method further includes: comparing the target frequency with a set minimum frequency of the multi-split air-conditioning cold operation; if the target frequency is less than or equal to the set minimum frequency, controlling the compressor to operate at the set minimum frequency so as to condense the target indoor unit; and if the target frequency is greater than the set minimum frequency, executing the step of controlling the compressor to perform refrigeration operation at the target frequency. Based on this, it can be ensured that the compressor has a sufficient output capacity to ensure condensation of the target indoor unit.

And step S12, in the second refrigeration stage, controlling the multi-split air-conditioning refrigeration operation according to a second parameter so as to condense the condensation on the target indoor unit into frost.

The second parameter specifically refers to an operation parameter that any refrigeration component in the air conditioner can cause the target indoor unit to frost, and specifically, the second parameter may include a frequency parameter of the compressor, a rotating speed parameter of the fan, an opening parameter of the electronic expansion valve, and the like. The specific numerical value and the type of the second parameter can be set according to actual conditions, and the target indoor unit is only required to be guaranteed to be condensed and frosted.

Specifically, in this embodiment, the second parameter includes a second frequency adjustment parameter of the compressor, and referring to fig. 7, the step S12 includes:

step S121, in the second refrigeration stage, obtaining the temperature of a second heat exchanger corresponding to the started indoor unit;

the number of the opened indoor units is more than one, and the step of acquiring the temperature of the second heat exchanger corresponding to the opened indoor units comprises the following steps: detecting the temperature of a second coil of each started indoor unit to obtain a fourth rated refrigerating capacity of each started indoor unit; determining a second weight value corresponding to each started indoor unit according to the obtained fourth rated refrigerating capacity; and performing weighted average calculation operation on more than one second coil temperature according to the second weight value to obtain the second heat exchanger temperature.

It should be noted that, the manner of obtaining the temperature of the second heat exchanger and the technical effect thereof may be similar to the implementation manner related to the temperature of the first heat exchanger in the foregoing embodiment, and details are not described herein.

Step S122, determining a second frequency adjustment parameter of the compressor according to the temperature of the second heat exchanger and the target evaporation temperature;

the target evaporation temperature specifically refers to a temperature of a heat exchanger of an opened indoor unit, which can cause frosting of the target indoor unit, in an evaporation state, which needs to reach a target value, and the target evaporation temperature may be a preset fixed parameter or a parameter determined based on an actual operation condition (for example, indoor and outdoor ambient temperatures) of the air conditioner.

In this embodiment, the second frequency adjustment parameter specifically includes an adjustment direction, an adjustment amplitude, and/or an adjustment rate.

A second frequency adjustment parameter for the compressor at a different second heat exchanger temperature and a different target evaporating temperature. The corresponding relation among the temperature of the second heat exchanger, the target evaporation temperature and the frequency adjustment parameter can be preset and can have the forms of a calculation formula, a mapping relation and the like. Specifically, the number relationship between the characteristic temperature of the second coil and the target evaporation temperature is different (such as a magnitude relationship, a temperature deviation, a ratio and the like), and different frequency adjustment parameters can be correspondingly provided. And determining the frequency adjustment parameters of the compressor corresponding to the current temperature of the second heat exchanger and the target evaporation temperature based on the preset corresponding relation.

Specifically, in the embodiment, step S122 includes:

step S122a, determining a second magnitude relationship between the second heat exchanger temperature and the target evaporation temperature, and determining a second temperature deviation between the second heat exchanger temperature and the target evaporation temperature;

the second temperature deviation refers to an absolute value of a difference between the second heat exchanger temperature and the target evaporating temperature.

Step S122b, determining a second adjusting direction of the compressor frequency according to the second magnitude relationship, and determining a second adjusting rate of the compressor frequency according to the second temperature deviation;

specifically, the second adjustment direction of the compressor frequency is different when the second magnitude relation is different. When the second magnitude relation is that the temperature of the second heat exchanger is greater than the target evaporation temperature, determining that the second adjustment direction is increasing frequency; and when the second magnitude relation is that the second heat exchanger temperature is lower than the target evaporation temperature, determining that the second adjusting direction is frequency reduction. When the temperature of the second heat exchanger is higher than the target evaporation temperature, the overall temperature of the started indoor unit of the multi-split air conditioner is relatively high, and condensation on the target indoor unit is difficult to frost, so that the target indoor unit can be effectively frosted by increasing the frequency, and the cleaning effect of the target indoor unit is ensured. When the characteristic parameter temperature of the second coil is lower than the target evaporation temperature, the integral temperature of the started indoor unit of the multi-split air conditioner is low, and the temperature of the target indoor unit is enough to condense the condensation into frost, so that the energy efficiency of the multi-split air conditioning system is improved by reducing the frequency, and the air conditioner can realize the cleaning of the target indoor unit with better energy efficiency.

The corresponding relationship between the second temperature deviation and the second adjustment rate may be preset, and may have the form of a calculation formula, a mapping relationship, or the like. The second adjustment rate increases with an increase in the second temperature deviation. For example, the second temperature deviation corresponds to a second adjustment rate when the second temperature deviation is in a different temperature difference interval. In this embodiment, the adjustment rate of the compressor is determined by combining the second temperature deviation, so that the adjustment rate of the frequency when the frequency is decreased or increased can be matched with the temperature deviation between the temperature of the second heat exchanger and the target evaporation temperature, and the temperature of the target indoor unit can be ensured to quickly reach the temperature range where the target evaporation temperature is located by adjusting the frequency.

Further, before the step of determining a second adjustment direction of the compressor frequency according to the second magnitude relationship and determining a second adjustment rate of the compressor frequency according to the second temperature deviation, the method further includes: comparing the second temperature deviation with a second preset threshold value; if the comparison result is that the second temperature deviation is greater than or equal to the second preset threshold, executing the step of determining a second adjustment direction of the compressor frequency according to the second magnitude relation and determining a second adjustment rate of the compressor frequency according to the second temperature deviation; and when the second temperature deviation is smaller than a second preset threshold value, controlling the compressor to maintain the current frequency operation. Specifically, the range of the second preset threshold value can be set according to actual requirements, in this embodiment, the range of the second preset threshold value is 1 degree celsius, and in other embodiments, the second preset threshold value can also be set to 1.5 degrees celsius, 2 degrees celsius, 3 degrees celsius, and the like. In this embodiment, through the setting of the second preset threshold, when the deviation between the temperature of the second heat exchanger and the target evaporation temperature is large, the frequency of the compressor of the outdoor unit is adjusted, so that the frequent adjustment of the frequency of the compressor can be effectively avoided, and the stability of the overall operation of the multi-split air conditioner is ensured.

For example, defining the second heat exchanger temperature as T2_ avg and the target evaporating temperature as T2_ targetcool, the process of determining the frequency adjustment parameter of the compressor in combination with the second heat exchanger temperature and the target evaporating temperature may be specifically determined based on the following relationship:

1) t2_ avg-T2_ targetpool > 5, compressor frequency is ramped up at 3Hz per 30 seconds;

2) t2_ avg-T2_ targetcool is more than 3 and less than or equal to 5, and the frequency of the compressor rises at the speed of 2Hz per 60 seconds;

3) t2_ avg-T2_ targetpool is more than 1 and less than or equal to 3, and the frequency of the compressor rises at the speed of 1Hz per 120 seconds;

4) -1 < T2_ avg-T2_ targetpool ≦ 1, compressor frequency remaining unchanged;

5) -3 < T2_ avg-T2_ targetcool ≦ 1, compressor frequency decreased at 1Hz per 90 seconds;

6) -5 < T2_ avg-T2_ targetcool ≦ -3, compressor frequency decreased at 2Hz per 60 seconds;

7) t2_ avg-T2_ targetpool ≦ -5, and the compressor frequency decreased at 3Hz per 30 seconds.

In step S122c, the second adjustment direction and the second adjustment rate are determined as the second frequency adjustment parameter.

And S123, controlling the compressor to adjust the refrigeration frequency according to the second frequency adjustment parameter.

In the embodiment, different parameters are adopted in stages to regulate and control the air conditioner during the refrigeration operation of the air conditioner, so that the target indoor unit is ensured to be frosted quickly, and the target indoor unit is cleaned quickly and effectively.

Further, before the step of controlling the multi-split air-conditioning cooling operation according to the second parameter, the method further includes: when entering the second refrigeration stage, controlling a fan corresponding to the started indoor unit to stop running for a second set time; controlling a fan corresponding to the started indoor unit to operate at a rotating speed lower than a fourth set rotating speed for a third set time period; and executing the step of controlling the multi-split air-conditioning cold operation according to the second parameter. The specific values of the second set time period and the third set time period may be set according to circumstances. In the present embodiment, the second set time period is 7 minutes, and the third set time period is 4 minutes.

Further, in the embodiment, in the first refrigeration stage, after 10 minutes of operation or any indoor evaporator T2 with the temperature less than or equal to-10 ℃ enters the second refrigeration stage; in the second refrigeration stage, after 10 minutes of operation or when the temperature of any indoor evaporator T2 is less than or equal to minus 10 ℃, the frosting can be considered to be completed, and at the moment, the air conditioner can be controlled to be switched to heating operation to defrost the target indoor unit.

Further, based on any of the above embodiments, a further four embodiments of the cleaning method of the multi-split air conditioner of the present application are provided. In the present embodiment, referring to fig. 8, step S20 includes:

step S21, acquiring the temperature of a third heat exchanger corresponding to the started indoor unit in the heating state of the multi-split air conditioner;

in this embodiment, the manner of obtaining the temperature of the third heat exchanger and the technical effect thereof can be similar to the above embodiment, and are not described herein again.

Step S22, determining a third frequency adjusting parameter of the compressor according to the third heat exchanger temperature and the target defrosting temperature; the target defrosting temperature is less than or equal to the target sterilizing temperature;

the target defrosting temperature specifically refers to a target value to be reached by the temperature of the heat exchanger of the turned-on indoor unit, which can melt frosting of the target indoor unit. Specifically, the target defrosting temperature may be a preset fixed parameter, or may be a parameter determined based on the previous operation condition in the refrigeration frosting process.

In this embodiment, the third frequency adjustment parameter specifically includes an adjustment direction, an adjustment amplitude, and/or an adjustment rate.

A third frequency adjustment parameter for a different third heat exchanger temperature and a different target defrost temperature compressor. The corresponding relation among the temperature of the third heat exchanger, the target defrosting temperature and the frequency adjusting parameter can be preset and can be in the forms of a calculation formula, a mapping relation and the like. Specifically, the third coil has different quantity relationships (such as size relationships, temperature deviations, ratios and the like) between the temperature characteristic temperature and the target defrosting temperature, and different frequency adjustment parameters can be correspondingly provided. And determining the frequency adjustment parameters of the compressor corresponding to the current temperature of the third heat exchanger and the target defrosting temperature based on the preset corresponding relation.

Specifically, in this embodiment, step S22 includes:

step S221, determining a third magnitude relation between the third heat exchanger temperature and the target defrosting temperature, and determining a third temperature deviation between the third heat exchanger temperature and the target defrosting temperature;

the third temperature deviation refers to an absolute value of a difference between the third heat exchanger temperature and the target defrosting temperature.

Step S222, determining a third adjusting direction of the compressor frequency according to the third magnitude relationship, and determining a third adjusting rate of the compressor frequency according to the third temperature deviation;

wherein, if the third magnitude relation is different, the third adjusting direction is different. When the third magnitude relation is that the third heat exchanger temperature is greater than the target defrosting temperature, determining that the third adjusting direction is to reduce the frequency; when the third magnitude relation is that the third heat exchanger temperature is lower than the target defrosting temperature, determining that the third adjusting direction is increasing frequency. Here, when the temperature of the third heat exchanger is lower than the target defrosting temperature, it indicates that the overall temperature of the indoor unit which is turned on by the multi-split air conditioner is relatively low, and the frost on the target indoor unit is difficult to melt, so that the rapid defrosting of the target indoor unit can be realized by increasing the frequency, and the cleaning effect of the target indoor unit is ensured. When the third coil characteristic parameter temperature is higher than the target defrosting temperature, the integral temperature of the started indoor unit of the multi-split air conditioner is high enough, and the temperature of the target indoor unit is high enough to melt the frost quickly, so that the reliable operation of the air conditioning system for cleaning the target indoor unit is ensured by reducing the frequency.

The corresponding relationship between the third temperature deviation and the third adjustment rate may be preset, and may have a calculation formula, a mapping relationship, and the like. The third adjustment rate increases with an increase in the third temperature deviation. For example, the third temperature deviation corresponds to a different third adjustment rate when the third temperature deviation is in a different temperature difference interval. In this embodiment, the adjustment rate of the compressor is determined by combining the third temperature deviation, so that the adjustment rate of the frequency when the frequency is decreased or increased can be matched with the temperature deviation between the temperature of the third heat exchanger and the target defrosting temperature, and the temperature of the target indoor unit can be quickly reached to the temperature range where the target defrosting temperature is located by adjusting the frequency.

Further, before the step of determining a third adjustment direction of the compressor frequency according to the third magnitude relationship and determining a third adjustment rate of the compressor frequency according to the third temperature deviation, the method further includes: comparing the third temperature deviation with a third preset threshold value; if the comparison result is that the third temperature deviation is greater than or equal to the third preset threshold, executing the step of determining a third adjustment direction of the compressor frequency according to the third magnitude relation and determining a third adjustment rate of the compressor frequency according to the third temperature deviation; and when the third temperature deviation is smaller than a third preset threshold value, controlling the compressor to maintain the current frequency operation. Specifically, the range of the third preset threshold may be set according to actual requirements, in this embodiment, the range of the third preset threshold is 1 degree celsius, and in other embodiments, the third preset threshold may also be set to 1.5 degrees celsius, 2 degrees celsius, 3 degrees celsius, or the like. In this embodiment, through the setting of third preset threshold value, when the deviation of third heat exchanger temperature and target defrosting temperature is great, just adjust the compressor frequency of off-premises station, can effectively avoid the frequent adjustment of compressor frequency, guarantee the stability of the whole operation of multi-connected air conditioner.

In step S223, the third adjusting direction and the third adjusting rate are determined as the third frequency adjusting parameter.

For example, in this embodiment, the third heat exchanger temperature is defined as T2_ avg, and the target defrosting temperature is defined as T2_ target thetaat 1, and the process of determining the compressor frequency adjustment parameter based on the third heat exchanger temperature and the target defrosting temperature may specifically be performed according to the following corresponding relationship:

1) t2_ avg-T2_ targetthe at1 > 3, the compressor frequency is decreased at a rate of 2Hz per 30 seconds;

2) 1< T2_ avg-T2_ targethat 1 is less than or equal to 3, and the frequency of the compressor is reduced at the speed of 1Hz per 60 seconds;

3) -1 < T2_ avg-T2_ targethat 1 ≦ 1, the compressor frequency remaining unchanged;

4) -3 < T2_ avg-T2_ targethat 1 ≦ 1, the compressor frequency increasing at a rate of 1Hz per 120 seconds;

5) t2_ avg-T2_ targethat 1 ≦ -3, and the compressor frequency is ramped up at 2Hz per 60 seconds.

And step S23, controlling the compressor to adjust the heating frequency according to the third frequency adjustment parameter.

In this embodiment, the temperature of the third heat exchanger of the turned-on indoor unit can represent the actual load conditions of all turned-on indoor units of the multi-split air conditioner including the target indoor unit at present, and based on this, the frequency adjustment parameter of the compressor is determined by combining the temperature of the heat exchanger and the target defrosting temperature, so that the accuracy of the determined frequency adjustment parameter in regulating and controlling the compressor is ensured, and the reliable operation of the multi-split air conditioner is ensured while the cleaning effect of the target indoor unit is ensured.

Further, in this embodiment, before the step of controlling the compressor to adjust the heating frequency according to the third frequency adjustment parameter, the method further includes: when the multi-split air conditioner starts to heat, controlling the compressors and fans corresponding to the indoor units to stop; and when the stop of the fan corresponding to the compressor and the indoor unit reaches a fourth set time length, executing the step of controlling the compressor to adjust the heating frequency according to the third frequency adjustment parameter. Here, at the initial stage of switching from cooling and frost formation to heating and defrosting operation, the compressor and the fan are stopped, so that the overhigh system pressure can be effectively avoided, and the reliable operation of the system is ensured. It should be noted that, in the process of adjusting the frequency, the fans of the target indoor unit maintain the off state, and the fans of the other indoor units may be turned on or off according to actual needs.

In addition, an embodiment of the present invention further provides a computer-readable storage medium, where a cleaning program of a multi-split air conditioner is stored, and when the cleaning program of the multi-split air conditioner is executed by a processor, the relevant steps of any of the above embodiments of the cleaning method of the multi-split air conditioner are implemented.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.

The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, a multi-connected air conditioner, or a network device) to execute the method according to the embodiments of the present invention.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A cleaning method of a multi-split air conditioner, which comprises at least two indoor units, is characterized by comprising the following steps:

controlling the multi-split air-conditioning cooling operation to frost a target indoor unit; the target indoor unit is one of at least two indoor units which receives a cleaning instruction;

and when the target indoor unit is defrosted, controlling the multi-split air conditioner to maintain the heating operation, and adjusting the operation rotating speed of a fan corresponding to the target indoor unit so as to enable the temperature of the target indoor unit to reach the target sterilization temperature.

2. The method for cleaning a multi-split air conditioner as claimed in claim 1, wherein the step of adjusting the operation rotation speed of a fan corresponding to the target indoor unit includes:

determining a rotating speed adjusting parameter according to the first coil pipe temperature and the temperature threshold;

3. The method for cleaning a multi-split air conditioner as claimed in claim 2, wherein the temperature threshold includes a first temperature threshold, the first temperature threshold is less than the target sterilization temperature, the rotation speed adjustment parameter includes a rotation speed adjustment direction, and the step of determining the rotation speed adjustment parameter based on the first coil temperature and the temperature threshold includes:

4. The method for cleaning a multi-split air conditioner as claimed in claim 3, wherein the temperature threshold value further includes a second temperature threshold value, the second temperature threshold value is greater than the target sterilization temperature, and the step of determining the rotation speed adjustment parameter according to the first coil temperature and the temperature threshold value further includes:

when the first coil temperature is greater than the second temperature threshold, determining that the rotating speed adjusting direction is an increasing rotating speed.

5. The method for cleaning a multi-split air conditioner as set forth in claim 1, wherein during the step of controlling the multi-split air conditioner to maintain a heating operation and adjusting the operation speed of the fan corresponding to the target indoor unit, further comprising:

controlling fans corresponding to other indoor units to be closed, and controlling the opening degrees of electronic expansion valves corresponding to the other indoor units to be reduced; when the opening degree of the electronic expansion valve is reduced, the refrigerant quantity of other indoor units is reduced;

and the other indoor units are the indoor units except the target indoor unit in the started indoor units.

6. The method for cleaning a multi-split air conditioner as claimed in claim 1, wherein before the step of adjusting the operating speed of the fan corresponding to the target indoor unit to make the temperature of the target indoor unit reach the target sterilization temperature, the method further comprises:

when the target indoor unit is defrosted, acquiring the outdoor environment temperature and the indoor environment temperature;

7. The method for cleaning a multi-split air conditioner as claimed in claim 1, wherein before the step of adjusting the operating speed of the fan corresponding to the target indoor unit to make the temperature of the target indoor unit reach the target sterilization temperature, the method further comprises:

acquiring the outdoor environment temperature;

8. The method of claim 7, wherein the target sterilization temperature is in a decreasing trend as the outdoor ambient temperature decreases.

9. The method for cleaning a multi-split air conditioner as claimed in claim 1, further comprising, during the process of adjusting the operating speed of a fan corresponding to the target indoor unit so that the temperature of the target indoor unit reaches a target sterilization temperature:

10. The method for cleaning a multi-split air conditioner as claimed in claim 9, wherein in the process of adjusting the operation speed of the fan corresponding to the target indoor unit so that the temperature of the target indoor unit reaches the target sterilization temperature, the method further comprises:

acquiring operation state parameters of the multi-split air conditioner;

if the running state parameter indicates that no outdoor unit defrosting operation or compressor oil return operation exists after the target indoor unit defrosting of the multi-split air conditioner is finished, acquiring a first time length as the target sterilization time length;

wherein the second duration is greater than the first duration.

11. The method for cleaning a multi-split air conditioner as claimed in any one of claims 1 to 10, wherein during the step of adjusting the operating speed of the fan corresponding to the target indoor unit, further comprising:

12. The method for cleaning a multi-split air conditioner as claimed in claim 11, wherein the step of adjusting the operating frequency of the compressors comprises:

13. The method for cleaning a multi-split air conditioner as claimed in claim 12, wherein the step of determining a first frequency adjustment parameter of the compressor based on the first heat exchanger temperature and the target sterilization temperature comprises:

14. The method for cleaning a multi-split air conditioner as claimed in claim 12, wherein the number of the turned-on indoor units is more than one, and the step of acquiring the temperature of the first heat exchanger corresponding to the turned-on indoor unit comprises:

15. The method for cleaning a multi-split air conditioner as claimed in any one of claims 1 to 10, wherein a refrigerating frosting process of the multi-split air conditioner sequentially includes a first refrigerating stage and a second refrigerating stage, and the controlling the multi-split air conditioner to perform a cooling operation to frost a target indoor unit includes:

16. The method for cleaning a multi-split air conditioner as set forth in claim 15, wherein the first parameter includes a target frequency of the compressor, and the step of controlling the multi-split air conditioning operation according to the first parameter to condense the target indoor unit in the first cooling stage comprises:

17. The method for cleaning a multi-split air conditioner as claimed in claim 16, further comprising, before the step of controlling the compressors to operate at the target frequency:

18. The method for cleaning a multi-split air conditioner as claimed in claim 15, wherein the second parameter includes a second frequency adjustment parameter of a compressor, and the step of controlling the multi-split air conditioner in the second cooling stage according to the second parameter to condense the condensation on the target indoor unit into frost includes:

19. The method for cleaning a multi-split air conditioner as claimed in claim 16, wherein the step of determining the second frequency adjustment parameter of the compressor based on the second heat exchanger temperature and the target evaporation temperature comprises:

determining a second adjusting direction of the compressor frequency according to the second magnitude relation, and determining a second adjusting rate of the compressor frequency according to the second temperature deviation;

20. The method of claim 19, wherein the second adjustment rate is in an increasing trend as the second temperature deviation increases.

21. The method for cleaning a multi-split air conditioner as claimed in claim 19, wherein the step of determining the second adjustment direction of the compressor frequency according to the second magnitude relation comprises:

22. The method for cleaning a multi-split air conditioner as claimed in claim 21, wherein the step of determining a second adjustment direction of the compressor frequency according to the second magnitude relationship and determining a second adjustment rate of the compressor frequency according to the second temperature deviation further comprises, before the step of determining the second adjustment rate of the compressor frequency according to the second temperature deviation:

and if the comparison result shows that the second temperature deviation is greater than or equal to the second preset threshold, executing the step of determining a second adjustment direction of the compressor frequency according to the second magnitude relation and determining a second adjustment rate of the compressor frequency according to the second temperature deviation.

23. The method for cleaning a multi-split air conditioner as claimed in claim 18, wherein the number of the activated indoor units is more than one, and the step of obtaining the temperature of the second heat exchanger corresponding to the activated indoor units comprises:

24. The method for cleaning a multi-split air conditioner as claimed in claim 15, wherein the fans corresponding to the turned-on indoor units are controlled to operate at a rotation speed less than a third set rotation speed in the first cooling stage; and/or the presence of a gas in the atmosphere,

when entering the second refrigeration stage, controlling a fan corresponding to the started indoor unit to stop running for a second set time;

25. A method for cleaning a multi-split air conditioner as set forth in any one of claims 1 to 10, wherein the controlling heating operation of the multi-split air conditioner to defrost the target indoor unit comprises:

26. The method for cleaning a multi-split air conditioner as claimed in claim 25, wherein the step of determining a third frequency adjustment parameter of the compressor based on the third heat exchanger temperature and a target defrosting temperature comprises:

27. The method of cleaning a multi-split air conditioner as set forth in claim 26, wherein the third adjustment rate is in an increasing trend as the third temperature deviation increases; and/or the presence of a gas in the atmosphere,

the step of determining a third adjustment direction of the compressor frequency according to the third magnitude relationship includes:

when the third magnitude relation is that the third heat exchanger temperature is higher than the target defrosting temperature, determining that the third adjusting direction is to reduce the frequency;

28. An air conditioning control device characterized by comprising: a memory, a processor, and a cleaning program of a multi-split air conditioner stored on the memory and executable on the processor, the cleaning program of the multi-split air conditioner implementing the steps of the method for cleaning a multi-split air conditioner as set forth in any one of claims 1 to 27 when executed by the processor.

29. A multi-split air conditioner, comprising:

at least two indoor units; and

an air conditioning control unit as set forth in claim 28, connected to said indoor unit.

30. A computer-readable storage medium, wherein the computer-readable storage medium has stored thereon a cleaning program of a multi-split air conditioner, which, when executed by a processor, implements the steps of the method of cleaning a multi-split air conditioner according to any one of claims 1 to 27.