Control method and control device of indoor unit, storage medium and air conditioner

Abstract

The application provides a control method and device of an indoor unit, a storage medium and an air conditioner. The control method comprises the following steps: acquiring a first return air temperature of the indoor unit; after the first return air temperature reaches a first preset temperature, controlling the indoor unit to enter a waste heat blowing stage; the waste heat blowing stage comprises at least two waste heat blowing modes; acquiring a second return air temperature of the indoor unit after the indoor unit enters the waste heat blowing stage; determining a characteristic value of the second return air temperature according to the second return air temperature; and controlling the indoor unit to enter a waste heat blowing mode corresponding to the characteristic value according to the characteristic value.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, specifically to a control method, control device, storage medium, and air conditioner for an indoor unit. Background Technology

[0002] The indoor unit is the device in an air conditioner used to regulate indoor air quality, and maintaining the indoor temperature within a suitable range is its most basic function. In current technology, when one or more indoor units in a multi-split air conditioner reach their designated temperature and shut down, the other indoor units continue to operate in heating mode. Considering oil return issues, the throttling devices corresponding to the one or more indoor units that shut down are in a refrigerant flow state, thus these units are essentially discharging residual heat. Therefore, the indoor units are still actually producing heat, albeit at a lower rate. In some cases, this reduced heat output can cause the indoor temperature to rise, preventing it from remaining within a suitable range. Summary of the Invention

[0003] This application provides a control method, control device, storage medium, and air conditioner for an indoor unit, aiming to solve the technical problem in the prior art where the indoor temperature cannot be maintained within a suitable range when the indoor unit blows out residual heat.

[0004] This application provides a method for controlling an indoor unit, including:

[0005] Obtain the first return air temperature of the indoor unit;

[0006] After the first return air temperature reaches the first preset temperature, the indoor unit is controlled to enter the residual heat blowing stage; the residual heat blowing stage includes at least two residual heat blowing modes;

[0007] Obtain the second return air temperature of the indoor unit after it enters the residual heat blowing stage;

[0008] Determine the characteristic value of the second return air temperature based on the second return air temperature;

[0009] Based on the characteristic value, the indoor unit is controlled to enter the waste heat blowing mode corresponding to the characteristic value.

[0010] Optionally, the characteristic value includes the rate of change;

[0011] The step of controlling the indoor unit to enter the operating mode corresponding to the characteristic value of the return air temperature based on the characteristic value includes:

[0012] If the indoor unit maintains the state of change rate being greater than 0 for a first preset time, then the indoor unit is controlled to enter the first waste heat blowing mode; the first waste heat blowing mode is: the indoor unit's fan is turned off for a first preset time and then turned on for a second preset time;

[0013] If the indoor unit maintains the state of change rate being less than 0 for a second preset time, then the indoor unit is controlled to enter the second waste heat blowing mode; the second waste heat blowing mode is that the indoor unit's fan continues to run in the current operating state.

[0014] Optionally, the control method further includes:

[0015] During the operation of the indoor unit in the second waste heat blowing mode, the ambient temperature of the indoor unit is obtained;

[0016] If the ambient temperature is lower than the second preset temperature, the indoor unit is controlled to enter the heating mode until the return air temperature of the indoor unit reaches the first preset temperature again, and the indoor unit is controlled to continue to enter the residual heat blowing stage.

[0017] Optionally, determining the characteristic value of the second return air temperature based on the second return air temperature includes:

[0018] Based on the second return air temperature, determine the curve of the second return air temperature changing over time;

[0019] Based on the aforementioned change curve, determine the rate of change of the second return air temperature per unit time.

[0020] Optionally, the first preset duration is longer than the second preset duration.

[0021] Optionally, controlling the indoor unit to enter an operating mode corresponding to the characteristic value of the return air temperature based on the characteristic value includes:

[0022] If the indoor unit maintains the second return air temperature higher than the third return air temperature for a third preset time, then the indoor unit is controlled to enter the third residual heat blowing mode; the third residual heat blowing mode is: the indoor unit's fan is turned off for a third preset time and then turned on for a fourth preset time; wherein, the third return air temperature is the return air temperature when the indoor unit enters the residual heat blowing stage.

[0023] Optionally, the third preset duration is longer than the fourth preset duration.

[0024] Secondly, embodiments of this application also provide a control device for an indoor unit, comprising:

[0025] The acquisition module is used to acquire the first return air temperature of the indoor unit and the second return air temperature after the indoor unit enters the residual heat blowing stage;

[0026] The control module is used to control the indoor unit to enter the waste heat blowing stage after the first return air temperature reaches the first preset temperature; the waste heat blowing stage includes at least two waste heat blowing modes.

[0027] The determining module is used to determine the characteristic value of the second return air temperature based on the second return air temperature;

[0028] The control module is also used to control the indoor unit to enter the waste heat blowing mode corresponding to the characteristic value, based on the characteristic value.

[0029] Thirdly, embodiments of this application also propose an air conditioner, including at least one indoor unit, wherein the control method for the at least one indoor unit adopts the control method described above.

[0030] Fourthly, embodiments of this application also propose a storage medium storing a computer program, which is loaded by a processor to execute the steps in the control method for the indoor unit as described above.

[0031] In the technical solution of this application embodiment, during the operation of the indoor unit, the first return air temperature of the indoor unit is acquired; when the first return air temperature of the indoor unit reaches a first preset temperature, the indoor unit is controlled to enter the residual heat blowing state; then, the second return air temperature after the indoor unit enters the residual heat blowing stage is acquired, and a characteristic value of the second return air temperature is determined based on the second return air temperature; then, a residual heat blowing mode corresponding to the characteristic value is determined based on the characteristic value. The characteristic value of the second return air temperature reflects the heat preservation effect of the space where the indoor unit is located during the residual heat blowing stage; for example, the better the heat preservation effect, the higher the second return air temperature will be; if the heat preservation effect is moderate, the second return air temperature will remain at an appropriate level; if the heat preservation effect is poor, the second return air temperature will gradually decrease; the indoor unit is controlled to enter the corresponding residual heat blowing mode based on the characteristic value, so that regardless of the heat preservation effect of the space, the temperature of the space where the indoor unit is located can provide users with a good sense of comfort during the residual heat blowing stage. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the structure of the air conditioner provided in the embodiment of this application;

[0034] Figure 2 This is a schematic diagram of the structure of the indoor unit provided in the embodiments of this application;

[0035] Figure 3 This is a flowchart illustrating the indoor unit control method provided in the embodiments of this application;

[0036] Figure 4 for Figure 3 A schematic diagram of an embodiment of step S500;

[0037] Figure 5 This is another flowchart illustrating the indoor unit control method provided in the embodiments of this application;

[0038] Figure 6 yes Figure 3 A schematic diagram of an embodiment of step S400;

[0039] Figure 7 yes Figure 3 A schematic diagram of another embodiment of step S500;

[0040] Figure 8 This is a schematic diagram of the structure of the indoor unit control device provided in the embodiments of this application. Detailed Implementation

[0041] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0043] In this application, the term "exemplary" is used to mean "serving as an example, illustration, or description." Any embodiment described as "exemplary" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use the invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that the invention can be made without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of the invention with unnecessary detail. Therefore, the invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0044] like Figure 1 As shown, the air conditioner includes an indoor unit 100 and an outdoor unit 200. The indoor unit 100 and the outdoor unit 200 are connected via refrigerant circulation piping. A multi-split air conditioner refers to one outdoor unit 200 and multiple indoor units 100; for example... Figure 1 The diagram shows two indoor units 100; in this application's technical solution, the number of indoor units 100 can be one or more than two. Each indoor unit 100 has an independent refrigerant circulation pipeline connected to the outdoor unit 200 and operates independently. Each indoor unit 100's refrigerant circulation pipeline is equipped with a throttling element, such as an expansion valve, to regulate the refrigerant flow rate. Figure 2 As shown, a return air temperature collection point is set at or near the air outlet of the indoor unit 100 to collect the return air temperature; an ambient temperature collection point is set in the indoor space to collect the ambient temperature.

[0045] In existing technology, when the indoor unit 100 heats to the set temperature, to avoid oil return, the expansion valve of the indoor unit 100 remains open, and it enters the stage of reaching the set temperature and then discharging residual heat. During this stage, the expansion valve maintains a small opening, the indoor fan operates at a low speed, and the indoor air absorbs heat as it passes through the evaporator, which then blows out hot air. However, the conditions of the spaces in which the indoor unit 100 is located vary. During this residual heat dissipation, some well-insulated spaces accumulate a large amount of hot air, causing the temperature to rise; some moderately insulated spaces maintain their temperature due to the residual heat; and some poorly insulated spaces experience a temperature drop even when discharging residual heat.

[0046] Therefore, this application provides a control method for an indoor unit, which can match the residual heat blowing mode according to the return air temperature of the indoor unit after the indoor unit enters the residual heat blowing stage, so as to solve the shortcomings of the prior art.

[0047] Reference Figure 3As shown in the embodiments of this application, a control method for an indoor unit is also proposed, including:

[0048] S100, obtains the first return air temperature of the indoor unit;

[0049] S200: After the first return air temperature reaches the first preset temperature, the indoor unit is controlled to enter the waste heat blowing stage; the waste heat blowing stage includes at least two waste heat blowing modes.

[0050] S300, obtain the second return air temperature after the indoor unit enters the residual heat blowing stage;

[0051] S400, determine the characteristic value of the second return air temperature based on the second return air temperature;

[0052] S500, based on the characteristic value, controls the indoor unit to enter the waste heat blowing mode corresponding to the characteristic value.

[0053] In the technical solution of this application embodiment, during the operation of the indoor unit, the first return air temperature of the indoor unit is acquired; when the first return air temperature of the indoor unit reaches a first preset temperature, the indoor unit is controlled to enter the residual heat blowing state; then, the second return air temperature after the indoor unit enters the residual heat blowing stage is acquired, and a characteristic value of the second return air temperature is determined based on the second return air temperature; then, a residual heat blowing mode corresponding to the characteristic value is determined based on the characteristic value. The characteristic value of the second return air temperature reflects the heat preservation effect of the space where the indoor unit is located during the residual heat blowing stage; for example, the better the heat preservation effect, the higher the second return air temperature will be; if the heat preservation effect is moderate, the second return air temperature will remain at an appropriate level; if the heat preservation effect is poor, the second return air temperature will gradually decrease; the indoor unit is controlled to enter the corresponding residual heat blowing mode based on the characteristic value, so that regardless of the heat preservation effect of the space, the temperature of the space where the indoor unit is located can provide users with a good sense of comfort during the residual heat blowing stage.

[0054] In the above embodiment, the first preset temperature is a temperature set according to the user's desired temperature. When the first return air temperature of the indoor unit reaches the first preset temperature, the ambient temperature of the indoor space where the indoor unit is located reaches the temperature set by the user, at which point the indoor unit enters the residual heat blowing stage. After entering the residual heat blowing stage, the indoor unit continues to operate. By acquiring the second return air temperature after the indoor unit enters the residual heat blowing stage, and then determining the residual heat blowing mode of the indoor unit based on the characteristic value of the second return air temperature, the system can be optimized.

[0055] The control method described above is particularly applicable to multi-split air conditioning units, where all indoor units can be controlled using this method. Once any indoor unit in the multi-split air conditioning unit reaches its heating temperature, its corresponding expansion valve is open. Since the insulation effect of each indoor unit's space varies, this control method allows each indoor unit to adaptively match a suitable residual heat dissipation mode based on the insulation effect of its space, ensuring user comfort.

[0056] Of course, the control method described in the above embodiment can also be used in the case of one indoor unit and one outdoor unit; that is, when the temperature of the space where the indoor unit is located reaches the temperature set by the user, the indoor unit enters the residual heat blowing stage. At this time, in order to maintain the space temperature near the set temperature, the indoor unit continues to operate. By acquiring the second return air temperature after the indoor unit enters the residual heat blowing stage, and then based on the characteristic value of the second return air temperature, the indoor unit can adaptively match the appropriate residual heat blowing mode according to the heat preservation effect of the space, ensuring user comfort.

[0057] Reference Figure 3 As shown, as an optional implementation of the above embodiments, the characteristic value includes the rate of change. In the embodiment, the rate of change can be the change value of the second return air temperature per unit time, for example, the change value of the second return air temperature within one minute; specifically, if the second return air temperature was 28 degrees Celsius one minute ago and is 28.5 degrees Celsius one minute later, then the rate of change is 0.5 degrees Celsius per minute. During the heating process, after the indoor unit enters the residual heat blowing stage, room overheating is a key technical problem that needs to be addressed. Therefore, controlling the indoor unit to enter the operating mode corresponding to the characteristic value of the return air temperature according to the characteristic value includes:

[0058] S510, if the indoor unit maintains the state of the rate of change being greater than 0 for a first preset time, then the indoor unit is controlled to enter the first waste heat blowing mode; the first waste heat blowing mode is: the indoor unit's fan is turned off for a first preset time and then turned on for a second preset time.

[0059] For example, if the rate of change collected each time within the first preset time is greater than 0, it indicates that the indoor space has a good heat preservation effect. The temperature inside continues to rise during the residual heat blowing stage, which may cause the indoor space to overheat. At this time, the indoor unit is controlled to enter the first residual heat blowing mode, that is, the indoor unit's fan is turned off for the first preset time and then turned on for the second preset time to reduce the heating capacity of the indoor unit in blowing residual heat. At the same time, because the indoor space has a good heat preservation effect, the fan will not cause the ambient temperature to drop even when it is turned off for the first preset time, thus improving the user's comfort.

[0060] The step of controlling the indoor unit to enter the operating mode corresponding to the characteristic value of the return air temperature based on the characteristic value further includes:

[0061] S520, if the indoor unit maintains the state of change rate being less than 0 for a second preset time, then control the indoor unit to enter the second waste heat blowing mode; the second waste heat blowing mode is that the fan of the indoor unit continues to run in the current operating state.

[0062] For example, if the rate of change collected each time within the second preset time is less than 0, it indicates that the indoor space has a mediocre heat preservation effect and the temperature inside continues to drop during the residual heat blowing stage. In this case, the indoor unit is controlled to enter the second residual heat blowing mode, that is, the indoor unit continues to run in the current operating state of keeping the fan on, maintaining the current heat production capacity of the indoor unit blowing residual heat, and will not cause the indoor room temperature to become too hot.

[0063] Furthermore, when the characteristic value fluctuates, it indicates that the space where the indoor unit is located has good heat preservation effect, and the indoor unit can continue to operate in its current state.

[0064] When the indoor space's insulation is only average, the indoor unit operates in the second residual heat blowing mode, and its temperature gradually decreases, which may lead to excessively low ambient temperatures. Therefore, refer to... Figure 5 As shown, as an optional implementation of the above embodiments, the control method further includes:

[0065] S600, during the process of the indoor unit operating in the second waste heat blowing mode, the ambient temperature of the indoor unit is obtained;

[0066] S700, if the ambient temperature is lower than the second preset temperature, the indoor unit is controlled to enter the heating mode until the return air temperature of the indoor unit reaches the first preset temperature again, and the indoor unit is controlled to continue to enter the residual heat blowing stage.

[0067] In this embodiment, when the indoor unit is running in the second waste heat blowing mode, if the heat output of the indoor unit is insufficient to maintain the ambient temperature at the second preset temperature set by the user, the indoor unit will continue to switch to the heating mode until the return air temperature of the indoor unit reaches the first preset temperature again, so as to raise the ambient temperature to above the second preset temperature range set by the user, and then enter the waste heat blowing stage again.

[0068] Reference Figure 6 As shown, as an optional implementation of the above embodiment, determining the characteristic value of the second return air temperature based on the second return air temperature includes:

[0069] S410, Based on the second return air temperature, determine the curve of the second return air temperature changing over time;

[0070] S420, Based on the change curve, determine the rate of change of the second return air temperature per unit time.

[0071] In this embodiment, after entering the residual heat blowing stage, the return air temperature collection point continuously or at a set frequency collects the second return air temperature of the indoor unit; by determining the change curve T = f(t) of the collected second return air temperature over time, the rate of change of the second return air temperature per unit time, dT / dt or ΔT / Δt, is determined based on the change curve.

[0072] In this embodiment, if dT / dt or ΔT / Δt is determined once every set unit time within a first preset time period, and if it is greater than 0 each time, the instruction manual indicates good heat preservation effect, but the room will overheat. If dT / dt or ΔT / Δt is determined once every set unit time within a second preset time period, and if it is less than 0 each time, the instruction manual indicates average or poor heat preservation effect, and the indoor space will not overheat. After running for a certain period of time, if the ambient temperature of the indoor space is lower than the second preset temperature, heating will resume. If dT / dt or ΔT / Δt is either greater than 0 or less than 0, it indicates that the residual heat blowing stage can effectively maintain the ambient temperature near the user-set range, and the current residual heat blowing mode will continue.

[0073] In the technical solutions of the above embodiments, the first preset time and the second preset time can be the same or different. For example, the first preset time and the second preset time can both be 3 minutes, 5 minutes, or 8 minutes; or, for example, the first preset time can be 3 minutes, 5 minutes, or 8 minutes, and the second preset time can be 2 minutes, 4 minutes, or 6 minutes. The specific values ​​of the first preset time and the second preset time can be set according to specific circumstances; they can be factory settings or set by the user according to their own needs.

[0074] As an optional implementation of the above embodiments, the first preset duration is longer than the second preset duration. In this embodiment, due to the better heat preservation effect, after the indoor unit enters the first residual heat blowing mode, the fan is turned off for a longer than the second preset duration, which can reduce energy consumption while ensuring that the indoor temperature does not drop again; for example, the first preset duration is 20 minutes and the second preset duration is 2 minutes; or the first preset duration is 15 minutes and the second preset duration is 2 minutes. The specific values ​​of the first and second preset durations can be set according to specific circumstances, and can be factory settings or set by the user according to their own needs.

[0075] In some embodiments, the characteristic value of the second return air temperature can be the second return air temperature value itself. (Refer to...) Figure 7As shown in the figure, as an optional implementation of the above embodiment, controlling the indoor unit to enter the operating mode corresponding to the characteristic value of the return air temperature according to the characteristic value includes:

[0076] S530, if the indoor unit maintains the second return air temperature higher than the third return air temperature for a third preset time, then the indoor unit is controlled to enter the third residual heat blowing mode; the third residual heat blowing mode is: the indoor unit's fan is turned off for a third preset time and then turned on for a fourth preset time; wherein, the third return air temperature is the return air temperature when the indoor unit enters the residual heat blowing stage.

[0077] In this embodiment, the indoor unit operates for a third preset time when the second return air temperature is greater than the third return air temperature, where the third return air temperature is the return air temperature when the indoor unit enters the residual heat blowing stage. This indicates that the indoor space has good heat preservation effect, and the indoor unit is then controlled to enter the third residual heat blowing mode. The third residual heat blowing mode is similar to the first residual heat blowing mode, i.e., the fan is turned off for a period of time and then turned on for a period of time. In some embodiments, the third residual heat blowing mode can be the same as the first residual heat blowing mode, i.e., the third preset time is the same as the first preset time, and the second preset time is the same as the fourth preset time. In other embodiments, the third residual heat blowing mode can differ from the first residual heat blowing mode, mainly in that the third preset time is different from the first preset time, and / or the fourth preset time is different from the second preset time.

[0078] As an optional implementation of the above embodiments, the third preset duration is longer than the fourth preset duration. In this embodiment, due to the better heat preservation effect, after the indoor unit enters the third residual heat blowing mode, the fan is turned off for a longer time than the fourth preset duration, which can reduce energy consumption while ensuring that the indoor temperature does not drop significantly; for example, the third preset duration is 20 minutes and the fourth preset duration is 2 minutes; or the third preset duration is 15 minutes and the fourth preset duration is 2 minutes. The specific values ​​of the third and fourth preset durations can be set according to specific circumstances, and can be factory settings or user-defined settings based on their own needs.

[0079] Reference Figure 8 As shown in the embodiments of this application, a control device for an indoor unit is also proposed, comprising:

[0080] The acquisition module 10 is used to acquire the first return air temperature of the indoor unit and the second return air temperature after the indoor unit enters the residual heat blowing stage;

[0081] Control module 20 is used to control the indoor unit to enter the waste heat blowing stage after the first return air temperature reaches the first preset temperature; the waste heat blowing stage includes at least two waste heat blowing modes;

[0082] The determining module 30 is used to determine the characteristic value of the second return air temperature based on the second return air temperature;

[0083] The control module 20 is also used to control the indoor unit to enter the waste heat blowing mode corresponding to the characteristic value, based on the characteristic value.

[0084] Furthermore, the control module 20 is configured as follows:

[0085] If the indoor unit maintains the state of change rate being greater than 0 for a first preset time, then the indoor unit is controlled to enter the first waste heat blowing mode; the first waste heat blowing mode is: the indoor unit's fan is turned off for a first preset time and then turned on for a second preset time;

[0086] If the indoor unit maintains the state of change rate being less than 0 for a second preset time, then the indoor unit is controlled to enter the second waste heat blowing mode; the second waste heat blowing mode is that the indoor unit's fan continues to run in the current operating state.

[0087] The acquisition module is further configured to acquire the ambient temperature of the indoor unit during the operation of the indoor unit in the second waste heat blowing mode;

[0088] Furthermore, the control module 20 is also configured to control the indoor unit to enter the heating mode if the ambient temperature is lower than the second preset temperature, until the return air temperature of the indoor unit reaches the first preset temperature again, and then control the indoor unit to continue to enter the residual heat blowing stage.

[0089] The determining module 30 is configured to determine the change curve of the second return air temperature over time based on the second return air temperature; and to determine the rate of change of the second return air temperature per unit time based on the change curve.

[0090] In an embodiment, the first preset duration is greater than the second preset duration.

[0091] The control module 20 is further configured to control the indoor unit to enter a third residual heat blowing mode if the indoor unit maintains the second return air temperature greater than the third return air temperature for a third preset time; the third residual heat blowing mode is: the indoor unit's fan is turned off for a third preset time and then turned on for a fourth preset time; wherein, the third return air temperature is the return air temperature when the indoor unit enters the residual heat blowing stage.

[0092] In this embodiment, the third preset duration is longer than the fourth preset duration.

[0093] This application also proposes an air conditioner, including at least one indoor unit, wherein the control method for the at least one indoor unit adopts the indoor unit control method described above:

[0094] Obtain the first return air temperature of the indoor unit;

[0095] After the first return air temperature reaches the first preset temperature, the indoor unit is controlled to enter the residual heat blowing stage; the residual heat blowing stage includes at least two residual heat blowing modes;

[0096] Obtain the second return air temperature of the indoor unit after it enters the residual heat blowing stage;

[0097] Determine the characteristic value of the second return air temperature based on the second return air temperature;

[0098] Based on the characteristic value, the indoor unit is controlled to enter the waste heat blowing mode corresponding to the characteristic value.

[0099] In the technical solution of this application embodiment, when the indoor unit of the air conditioner is running, the first return air temperature of the indoor unit is obtained; when the first return air temperature of the indoor unit reaches a first preset temperature, the indoor unit is controlled to enter the residual heat blowing state; then, the second return air temperature after the indoor unit enters the residual heat blowing stage is obtained, and a characteristic value of the second return air temperature is determined based on the second return air temperature; then, a residual heat blowing mode corresponding to the characteristic value is determined based on the characteristic value. The characteristic value of the second return air temperature reflects the heat preservation effect of the space where the indoor unit is located during the residual heat blowing stage; for example, the better the heat preservation effect, the higher the second return air temperature will be; if the heat preservation effect is moderate, the second return air temperature will remain at an appropriate level; if the heat preservation effect is poor, the second return air temperature will gradually decrease; the indoor unit is controlled to enter the corresponding residual heat blowing mode based on the characteristic value, so that regardless of the heat preservation effect of the space, the temperature of the space where the indoor unit is located can provide users with a good sense of comfort during the residual heat blowing stage.

[0100] In the above embodiment, the first preset temperature is a temperature set according to the user's desired temperature. When the first return air temperature of the indoor unit reaches the first preset temperature, the temperature of the space where the indoor unit is located reaches the temperature set by the user, at which point the indoor unit enters the residual heat blowing stage. At this time, the indoor unit continues to operate, and by acquiring the second return air temperature after the indoor unit enters the residual heat blowing stage, the residual heat blowing mode of the indoor unit is determined based on the characteristic value of the second return air temperature.

[0101] Reference Figure 2As shown, the air conditioner in the above embodiment is particularly suitable for multi-split air conditioning units, where each indoor unit can be controlled using this control method. After any indoor unit in the multi-split air conditioning unit reaches its heating temperature, its corresponding expansion valve is open. Since the insulation effect of each indoor unit's space varies, the above control method allows each indoor unit to adaptively match a suitable residual heat blowing mode based on the insulation effect of its space, ensuring user comfort. For example, when the indoor unit in indoor space 1 reaches its temperature and blows residual heat, the indoor unit in indoor space 2 can operate in heating mode. Or, for example, when the indoor unit in indoor space 1 reaches its temperature and blows residual heat in the first residual heat blowing mode, the indoor unit in indoor space 2 can reach its temperature and blow residual heat in the second residual heat blowing mode.

[0102] Of course, the air conditioner described above can also consist of only one indoor unit; that is, when the temperature of the space where the indoor unit is located reaches the temperature set by the user, the indoor unit enters the residual heat blowing stage. At this time, in order to maintain the space temperature near the set temperature, the indoor unit continues to operate. By acquiring the second return air temperature after the indoor unit enters the residual heat blowing stage, and then based on the characteristic value of the second return air temperature, the indoor unit can adaptively match the appropriate residual heat blowing mode according to the insulation effect of the space, ensuring user comfort.

[0103] In some embodiments, the characteristic value includes the rate of change;

[0104] The step of controlling the indoor unit to enter the operating mode corresponding to the characteristic value of the return air temperature based on the characteristic value includes:

[0105] If the indoor unit maintains the state of change rate being greater than 0 for a first preset time, then the indoor unit is controlled to enter the first waste heat blowing mode; the first waste heat blowing mode is: the indoor unit's fan is turned off for a first preset time and then turned on for a second preset time;

[0106] If the indoor unit maintains the state of change rate being less than 0 for a second preset time, then the indoor unit is controlled to enter the second waste heat blowing mode; the second waste heat blowing mode is that the indoor unit's fan continues to run in the current operating state.

[0107] In some embodiments, the control method further includes:

[0108] During the operation of the indoor unit in the second waste heat blowing mode, the ambient temperature of the indoor unit is obtained;

[0109] If the ambient temperature is lower than the second preset temperature, the indoor unit is controlled to enter the heating mode until the return air temperature of the indoor unit reaches the first preset temperature again, and the indoor unit is controlled to continue to enter the residual heat blowing stage.

[0110] In some embodiments, determining the characteristic value of the second return air temperature based on the second return air temperature includes:

[0111] Based on the second return air temperature, determine the curve of the second return air temperature changing over time;

[0112] Based on the aforementioned change curve, determine the rate of change of the second return air temperature per unit time.

[0113] In some embodiments, the first preset duration is longer than the second preset duration.

[0114] In some embodiments, controlling the indoor unit to enter an operating mode corresponding to the characteristic value of the return air temperature based on the characteristic value includes:

[0115] If the indoor unit maintains the second return air temperature higher than the third return air temperature for a third preset time, then the indoor unit is controlled to enter the third residual heat blowing mode; the third residual heat blowing mode is: the indoor unit's fan is turned off for a third preset time and then turned on for a fourth preset time; wherein, the third return air temperature is the return air temperature when the indoor unit enters the residual heat blowing stage.

[0116] In some embodiments, the third preset duration is longer than the fourth preset duration.

[0117] This application also proposes a control system for an indoor unit, comprising: one or more processors; a memory; and one or more application programs, wherein the one or more application programs are stored in the memory and configured to be executed by the processor to implement the control method for the indoor unit as described above.

[0118] Typically, the control system for the outlet air temperature of the fresh air unit includes: at least one processor, at least one memory, and a control program for the indoor unit's control device stored in the memory and executable on the processor. The control program for the indoor unit's control device is configured to implement the steps of the control method described above.

[0119] The processor may include one or more processing cores, such as a quad-core processor or an octa-core processor. The processor can be implemented using at least one hardware form of DSP (Digital Signal Processing), FPGA (Field-Programmable Gate Array), or PLA (Programmable Logic Array). The processor may also include a main processor and coprocessors. The main processor, also known as a CPU (Central Processing Unit), is used to process data in the wake-up state; the coprocessor is a low-power processor used to process data in the standby state. In some embodiments, the processor may integrate a GPU (Graphics Processing Unit), which is responsible for rendering and drawing the content to be displayed on the screen. The processor may also include an AI (Artificial Intelligence) processor, which processes the control methods of the indoor unit's control devices, enabling the indoor unit's control method model to learn autonomously, improving efficiency and accuracy.

[0120] The memory may include one or more computer-readable storage media, which may be non-transitory. The memory may also include high-speed random access memory and non-volatile memory, such as one or more disk storage devices or flash memory devices. In some embodiments, the non-transitory computer-readable storage media in the memory is used to store at least one instruction, which is executed by a processor to implement the indoor unit control method provided in the method embodiments of this application.

[0121] Obtain the first return air temperature of the indoor unit;

[0122] After the first return air temperature reaches the first preset temperature, the indoor unit is controlled to enter the residual heat blowing stage; the residual heat blowing stage includes at least two residual heat blowing modes;

[0123] Obtain the second return air temperature of the indoor unit after it enters the residual heat blowing stage;

[0124] Determine the characteristic value of the second return air temperature based on the second return air temperature;

[0125] Based on the characteristic value, the indoor unit is controlled to enter the waste heat blowing mode corresponding to the characteristic value.

[0126] In some embodiments, the characteristic value includes the rate of change;

[0127] The step of controlling the indoor unit to enter the operating mode corresponding to the characteristic value of the return air temperature based on the characteristic value includes:

[0128] If the indoor unit maintains the state of change rate being greater than 0 for a first preset time, then the indoor unit is controlled to enter the first waste heat blowing mode; the first waste heat blowing mode is: the indoor unit's fan is turned off for a first preset time and then turned on for a second preset time;

[0129] If the indoor unit maintains the state of change rate being less than 0 for a second preset time, then the indoor unit is controlled to enter the second waste heat blowing mode; the second waste heat blowing mode is that the indoor unit's fan continues to run in the current operating state.

[0130] In some embodiments, the control method further includes:

[0131] During the operation of the indoor unit in the second waste heat blowing mode, the ambient temperature of the indoor unit is obtained;

[0132] If the ambient temperature is lower than the second preset temperature, the indoor unit is controlled to enter the heating mode until the return air temperature of the indoor unit reaches the first preset temperature again, and the indoor unit is controlled to continue to enter the residual heat blowing stage.

[0133] In some embodiments, determining the characteristic value of the second return air temperature based on the second return air temperature includes:

[0134] Based on the second return air temperature, determine the curve of the second return air temperature changing over time;

[0135] Based on the aforementioned change curve, determine the rate of change of the second return air temperature per unit time.

[0136] In some embodiments, the first preset duration is longer than the second preset duration.

[0137] In some embodiments, controlling the indoor unit to enter an operating mode corresponding to the characteristic value of the return air temperature based on the characteristic value includes:

[0138] If the indoor unit maintains the second return air temperature higher than the third return air temperature for a third preset time, then the indoor unit is controlled to enter the third residual heat blowing mode; the third residual heat blowing mode is: the indoor unit's fan is turned off for a third preset time and then turned on for a fourth preset time; wherein, the third return air temperature is the return air temperature when the indoor unit enters the residual heat blowing stage.

[0139] In some embodiments, the third preset duration is longer than the fourth preset duration.

[0140] The control method, device, storage medium, and air conditioner of an indoor unit provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A control method for an indoor unit, characterized in that, include: Obtain the first return air temperature of the indoor unit; After the first return air temperature reaches the first preset temperature, the indoor unit is controlled to enter the residual heat blowing stage; the residual heat blowing stage includes at least two residual heat blowing modes; Obtain the second return air temperature of the indoor unit after it enters the residual heat blowing stage; Determine the characteristic value of the second return air temperature based on the second return air temperature; Based on the characteristic value, the indoor unit is controlled to enter the waste heat blowing mode corresponding to the characteristic value; The characteristic value includes the rate of change; The step of controlling the indoor unit to enter the waste heat blowing mode corresponding to the characteristic value includes: If the indoor unit maintains the state of change rate being greater than 0 for a first preset time, then the indoor unit is controlled to enter the first waste heat blowing mode; the first waste heat blowing mode is: the indoor unit's fan is turned off for a first preset time and then turned on for a second preset time; If the indoor unit maintains the state of change rate being less than 0 for a second preset time, then the indoor unit is controlled to enter the second waste heat blowing mode; the second waste heat blowing mode is that the indoor unit's fan continues to run in the current operating state.

2. The indoor unit control method as described in claim 1, characterized in that, The control method further includes: During the operation of the indoor unit in the second waste heat blowing mode, the ambient temperature of the indoor unit is obtained; If the ambient temperature is lower than the second preset temperature, the indoor unit is controlled to enter the heating mode until the return air temperature of the indoor unit reaches the first preset temperature again, and the indoor unit is controlled to continue to enter the residual heat blowing stage.

3. The indoor unit control method as described in claim 1 or 2, characterized in that, The characteristic value for determining the second return air temperature based on the second return air temperature includes: Based on the second return air temperature, determine the curve of the second return air temperature changing over time; Based on the aforementioned change curve, determine the rate of change of the second return air temperature per unit time.

4. The indoor unit control method as described in claim 1 or 2, characterized in that, The first preset duration is greater than the second preset duration.

5. The indoor unit control method as described in claim 1 or 2, characterized in that, The step of controlling the indoor unit to enter the waste heat blowing mode corresponding to the characteristic value includes: If the indoor unit maintains the second return air temperature higher than the third return air temperature for a third preset time, then the indoor unit is controlled to enter the third residual heat blowing mode; the third residual heat blowing mode is: the indoor unit's fan is turned off for a third preset time and then turned on for a fourth preset time; wherein, the third return air temperature is the return air temperature when the indoor unit enters the residual heat blowing stage.

6. The indoor unit control method as described in claim 5, characterized in that, The third preset duration is greater than the fourth preset duration.

7. A control device for an indoor unit, characterized in that, include: The acquisition module is used to acquire the first return air temperature of the indoor unit and the second return air temperature after the indoor unit enters the residual heat blowing stage; The control module is used to control the indoor unit to enter the waste heat blowing stage after the first return air temperature reaches the first preset temperature; the waste heat blowing stage includes at least two waste heat blowing modes. The determining module is used to determine the characteristic value of the second return air temperature based on the second return air temperature; The control module is further configured to control the indoor unit to enter a waste heat blowing mode corresponding to the characteristic value, based on the characteristic value; wherein the characteristic value includes a rate of change; The step of controlling the indoor unit to enter the waste heat blowing mode corresponding to the characteristic value includes: If the indoor unit maintains the state of change rate being greater than 0 for a first preset time, then the indoor unit is controlled to enter the first waste heat blowing mode; the first waste heat blowing mode is: the indoor unit's fan is turned off for a first preset time and then turned on for a second preset time; If the indoor unit maintains the state of change rate being less than 0 for a second preset time, then the indoor unit is controlled to enter the second waste heat blowing mode; the second waste heat blowing mode is that the indoor unit's fan continues to run in the current operating state.

8. An air conditioner, characterized in that, It includes at least one indoor unit, and the control method of the at least one indoor unit adopts the control method of the indoor unit according to any one of claims 1 to 6.

9. A storage medium, characterized in that, It stores a computer program, which is loaded by a processor to execute the steps in the control method of the indoor unit according to any one of claims 1 to 6.

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