Air conditioner and its control method, computer-readable storage medium

Abstract

The present invention discloses a control method for an air conditioner. Based on an air conditioner provided with a separated fresh air duct and an indoor return air duct, a ventilation opening is provided between the two ducts. The method includes: when the fresh air function is in an on state, obtaining the indoor temperature and the fresh air temperature; when the fresh air function is turned on, outdoor fresh air is sent into the indoor environment from the fresh air duct; determining a target control temperature and its corresponding target dew point temperature according to the indoor temperature and the fresh air temperature; when the target control temperature is less than or equal to the target dew point temperature, opening the ventilation opening or stopping introducing fresh air, wherein when the ventilation opening is opened, the air in the indoor return air duct enters the fresh air duct and mixes with the fresh air. The present invention also discloses an air conditioner and a computer-readable storage medium. The present invention aims to avoid the condensation phenomenon of the air conditioner and ensure the normal operation of the air conditioner.

Description

Technical Field

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

[0002] With the development of economy and technology, the functions of air conditioners are becoming more and more abundant. Currently, in addition to the conventional heating and cooling functions, air conditioners also have a fresh air function. When the fresh air function of the air conditioner is turned on, the air conditioner can introduce outdoor fresh air into the room to ensure the freshness of the indoor air environment.

[0003] However, during the process of introducing fresh air, due to the temperature and humidity differences between indoors and outdoors, condensation is likely to occur on the air conditioner, affecting the normal operation of the air conditioner. Summary of the Invention

[0004] The main object of the present invention is to provide a control method for an air conditioner, an air conditioner, and a computer-readable storage medium, aiming to avoid the condensation phenomenon of the air conditioner and ensure the normal operation of the air conditioner.

[0005] To achieve the above object, the present invention provides a control method for an air conditioner. The air conditioner is provided with a separated fresh air duct and an indoor return air duct, and there is a ventilation opening between the fresh air duct and the indoor return air duct. The control method of the air conditioner includes the following steps:

[0006] When the fresh air function is in the on state, obtain the indoor temperature and the fresh air temperature; when the fresh air function is turned on, outdoor fresh air is sent into the indoor environment from the fresh air duct;

[0007] Determine the target control temperature and its corresponding target dew point temperature according to the indoor temperature and the fresh air temperature;

[0008] When the target control temperature is less than or equal to the target dew point temperature, open the ventilation opening or stop introducing fresh air, wherein when the ventilation opening is opened, the air in the indoor return air duct enters the fresh air duct and mixes with the fresh air.

[0009] Optionally, the step of determining the target control temperature and its corresponding target dew point temperature according to the indoor temperature and the fresh air temperature includes:

[0010] When the indoor temperature is greater than the fresh air temperature, determine the fresh air temperature as the target control temperature, and obtain the indoor dew point temperature as the target dew point temperature; the indoor dew point temperature is determined according to the indoor temperature and the indoor humidity;

[0011] When the indoor temperature is lower than the fresh air temperature, determine the indoor temperature as the target control temperature, and obtain the fresh air dew point temperature as the target dew point temperature; the fresh air dew point temperature is determined according to the fresh air temperature and the fresh air humidity.

[0012] Optionally, the step of opening the ventilation opening or stopping introducing fresh air when the target control temperature is less than or equal to the target dew point temperature includes:

[0013] When the target control temperature is less than or equal to the target dew point temperature, determine the deviation between the target control temperature and the target dew point temperature;

[0014] When the deviation is less than or equal to a preset deviation threshold, open the ventilation opening;

[0015] When the deviation is greater than the preset deviation threshold, stop introducing fresh air.

[0016] Optionally, a fresh air fan is provided in the fresh air duct. After the step of opening the ventilation opening, the method further includes:

[0017] Reducing the rotational speed of the fresh air fan.

[0018] Optionally, an indoor fan is provided in the indoor return air duct. The step of reducing the rotational speed of the fresh air fan includes:

[0019] Obtain the current first rotational speed of the indoor fan and the current second rotational speed of the fresh air fan;

[0020] Determine the rotational speed difference between the first rotational speed and the second rotational speed;

[0021] Determine a rotational speed adjustment parameter according to the rotational speed difference and the deviation;

[0022] Reduce the rotational speed of the fresh air fan according to the rotational speed adjustment parameter.

[0023] Optionally, an indoor heat exchanger is provided in the indoor return air duct. After the step of determining the target control temperature and its corresponding target dew point temperature according to the indoor temperature and the fresh air temperature, the method further includes:

[0024] Obtain the on / off state of the compressor of the air conditioner;

[0025] When the on / off state is in the off state, execute the step of opening the ventilation opening or stopping introducing fresh air when the target control temperature is less than or equal to the target dew point temperature;

[0026] When the opening and closing state is the open state, control the air conditioner to introduce fresh air in a target flow direction, where the target flow direction is that outdoor fresh air enters the indoor return air duct and is sent into the indoor environment after being temperature-adjusted by the indoor heat exchanger.

[0027] Optionally, before the step of controlling the air conditioner to introduce fresh air in a target flow direction, it further includes:

[0028] When the opening and closing state is the open state, determine the temperature difference between the fresh air temperature and the set temperature of the air conditioner;

[0029] When the temperature difference is greater than or equal to the set temperature difference threshold, execute the step of controlling the air conditioner to introduce fresh air in a target flow direction;

[0030] When the temperature difference is less than the set temperature difference threshold, if the target control temperature is less than or equal to the target dew point temperature, open the ventilation opening.

[0031] Optionally, the air conditioner includes a housing, the housing is provided with a first return air inlet, a second return air inlet and a fresh air outlet, the fresh air duct is communicated with the fresh air outlet, both the first return air inlet and the second return air inlet are communicated with the indoor return air duct, the indoor temperature is detected by a temperature sensor arranged at the target return air inlet, and the target return air inlet is the one of the first return air inlet and the second return air inlet that is farther from the fresh air outlet.

[0032] In addition, to achieve the above object, the present application further provides an air conditioner, the air conditioner includes a housing and a control device, a fresh air duct and an indoor return air duct are arranged in the housing, a ventilation opening is arranged between the fresh air duct and the indoor return air duct, and a valve is arranged at the ventilation opening to open or close the ventilation opening;

[0033] The valve is connected to the control device, and the control device includes: a memory, a processor, and a control program of the air conditioner stored on the memory and executable on the processor. When the control program of the air conditioner is executed by the processor, it realizes the steps of the control method of the air conditioner as described in any one of the above.

[0034] In addition, to achieve the above object, the present application further provides a computer-readable storage medium, on which a control program of the air conditioner is stored. When the control program of the air conditioner is executed by a processor, it realizes the steps of the control method of the air conditioner as described in any one of the above.

[0035] A control method for an air conditioner proposed by the present invention is based on an air conditioner with a separated fresh air duct and an indoor return air duct, and a ventilation opening is provided between the two ducts. During the process of introducing fresh air from the fresh air duct into the indoor environment, one of the two temperatures is determined as the target control temperature according to the indoor temperature and the fresh air temperature, and the corresponding target dew point temperature is determined. When the determined target control temperature is less than or equal to the target dew point temperature, it indicates that there is a risk of condensation in the air conditioner. At this time, the indoor return air is mixed with the fresh air to adjust the temperature and humidity of the fresh air or stop introducing the fresh air, which can effectively avoid the condensation phenomenon caused by the temperature and humidity difference between the fresh air and the indoor air and ensure the normal operation of the air conditioner. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is a schematic structural diagram of an embodiment of the air conditioner of the present invention;

[0037] Figure 2 is a schematic hardware structure diagram involved in the operation of an embodiment of the air conditioner of the present invention;

[0038] Figure 3 is a schematic flow diagram of an embodiment of the control method of the air conditioner of the present invention;

[0039] Figure 4 is a schematic flow diagram of another embodiment of the control method of the air conditioner of the present invention;

[0040] Figure 5 is a schematic flow diagram of still another embodiment of the control method of the air conditioner of the present invention.

[0041] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0043] The main solution of the embodiment of the present invention is: an indoor return air duct and a fresh air duct are separated in the air conditioner, and a ventilation opening is provided between the indoor return air duct and the fresh air duct. Based on this air conditioner, when the fresh air function is in the on state, the indoor temperature and the fresh air temperature are obtained; when the fresh air function is turned on, outdoor fresh air is sent into the indoor environment from the fresh air duct; the target control temperature and its corresponding target dew point temperature are determined according to the indoor temperature and the fresh air temperature; when the target control temperature is less than or equal to the target dew point temperature, the ventilation opening is opened or the introduction of fresh air is stopped, wherein when the ventilation opening is opened, the air in the indoor return air duct enters the fresh air duct and is mixed with the fresh air.

[0044] In the prior art, during the introduction of fresh air, due to the temperature and humidity differences between indoors and outdoors, condensation is likely to occur on the air conditioner, affecting the normal operation of the air conditioner.

[0045] The present invention provides the above solutions, aiming to effectively avoid the condensation phenomenon caused by the temperature and humidity differences between fresh air and indoor air, and ensure the normal operation of the air conditioner.

[0046] An embodiment of the present invention provides an air conditioner. In this embodiment, the air conditioner is a floor-standing air conditioner. In other embodiments, the air conditioner can also be a wall-mounted air conditioner, a window air conditioner, etc. set according to actual needs.

[0047] In this embodiment, referring to Figure 1 , the air conditioner includes a housing 1, and the housing 1 is provided with a return air inlet 01, a supply air outlet 02, a fresh air inlet 03, and a fresh air outlet 04. A separated fresh air duct and an indoor return air duct are provided inside the housing 1. The return air inlet 01 and the supply air outlet 02 are communicated with the indoor return air duct, and the fresh air inlet 03 and the fresh air outlet 04 are communicated with the fresh air duct.

[0048] In this embodiment, the return air inlet 01 is provided on the front surface of the upper part of the air conditioner so that the air conditioner supplies air from the front. In other embodiments, the return air inlet 01 can also be provided at positions such as the top or bottom of the air conditioner according to actual needs.

[0049] The number of return air inlets 01 can be set to one or more according to actual needs. In this embodiment, the number of return air inlets 01 is two.

[0050] An indoor fan 2 and an indoor heat exchanger 4 are provided in the indoor return air duct, and a fresh air fan 3 is provided in the fresh air duct. When the indoor fan 2 is turned on and the compressor 5 connected to the indoor heat exchanger 4 is turned on, the indoor fan 2 drives indoor air to enter the indoor return air duct from the return air inlet 01, and after heat exchange through the indoor heat exchanger 4, it is sent into the indoor environment from the supply air outlet 02. When the fresh air fan 3 starts, the fresh air fan 3 drives outdoor fresh air to enter the fresh air duct from the fresh air inlet 03 and is sent into the room from the fresh air outlet 04. It should be noted that in this embodiment, no heat exchanger is provided in the fresh air duct.

[0051] Among them, a ventilation opening is provided between the indoor return air duct and the fresh air duct, and a valve 8 is provided at the ventilation opening to open or close the ventilation opening. When the ventilation opening is opened, driven by the fresh air fan 3, the air entering the indoor return air duct from the return air inlet 01 can enter the fresh air duct through the ventilation opening and be mixed with the fresh air entering the fresh air duct, and the mixed air is sent into the room from the fresh air outlet 04.

[0052] Further, in this embodiment, the air conditioner further includes a temperature detection module 6 and a humidity detection module 7. The temperature detection module 6 includes a first temperature sensor and a second temperature sensor. The first temperature sensor is disposed at the air return opening 01 for detecting the indoor temperature, and the second temperature sensor is disposed in the fresh air duct for detecting the fresh air temperature. The humidity detection module 7 includes a first humidity sensor and a second humidity sensor. The first humidity sensor is disposed at the air return opening 01 for detecting the indoor return air humidity, and the second humidity sensor is disposed in the fresh air duct for detecting the fresh air humidity.

[0053] Specifically, in this embodiment, the number of air return openings 01 of the air conditioner is more than one, which are respectively defined as the first air return opening and the second air return opening. The distance between the first air return opening and the fresh air outlet 04 is defined as the first distance, and the distance between the second air return opening and the fresh air outlet 04 is defined as the second distance. When the first distance is greater than the second distance, the first temperature sensor and the first humidity sensor are disposed at the first air return opening; when the first distance is less than the second distance, the first temperature sensor and the first humidity sensor can be disposed at the second air return opening. Based on this, the influence of fresh air on the detection of indoor return air temperature and humidity can be reduced, and the accuracy of the indoor return air temperature and humidity detection results can be ensured.

[0054] Further, in this embodiment, a wind direction switching valve 9 is further provided at the fresh air inlet 03 of the air conditioner. The fresh air duct and the indoor return air duct are both connected to the wind direction switching valve 9, and the wind direction switching valve 9 can be used to switch the flow direction of fresh air. The wind direction switching valve 9 has a first valve position and a second valve position. When the wind direction switching valve 9 is in the first valve position, the outdoor fresh air entering from the fresh air inlet 03 enters the fresh air duct and is sent into the indoor environment through the fresh air outlet 04; when the wind direction switching valve 9 is in the second valve position, the outdoor fresh air entering from the fresh air inlet 03 enters the indoor return air duct and is sent into the indoor environment through the air supply outlet 02 after heat exchange by the indoor heat exchanger 4.

[0055] Further, in this embodiment, the air conditioner further includes a control device. Referring to Figure 2 , the above-mentioned indoor fan 2, fresh air fan 3, compressor 5, valve 8 provided at the ventilation opening, wind direction switching valve 9 provided at the fresh air opening and other components are connected to the control device, and the control device can be used to control the operation of the above-mentioned components; in addition, the above-mentioned temperature detection module 6 and humidity detection module 7 can also be connected to the control device so that the air conditioner can obtain the detection data of indoor air and outdoor fresh air.

[0056] Referring to Figure 2 , the control device includes: a processor 1001 (such as a CPU), a memory 1002, etc. The memory 1002 can be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. Optionally, the memory 1002 can also be a storage device independent of the aforementioned processor 1001.

[0057] Those skilled in the art can understand that Figure 2 the device structure shown in does not constitute a limitation on the device, and may include more or fewer components than shown, or combine some components, or have different component arrangements.

[0058] Such as Figure 2 shown, the memory 1002 as a computer-readable storage medium may include a control program for the air conditioner. In Figure 2 the device shown, the processor 1001 may be used to call the control program for the air conditioner stored in the memory 1002 and perform the relevant step operations of the control method of the air conditioner in the following embodiments.

[0059] The embodiment of the present invention also provides a control method for an air conditioner, which is applied to control the above-mentioned air conditioner.

[0060] Referring to Figure 3 , an embodiment of the control method of the air conditioner of the present application is proposed. In this embodiment, a separated indoor return air duct and a fresh air duct are provided in the air conditioner, and a ventilation opening is provided between the indoor return air duct and the fresh air duct. The control method of the air conditioner includes:

[0061] Step S10, when the fresh air function is in the on state, obtain the indoor temperature and the fresh air temperature; when the fresh air function is turned on, outdoor fresh air is sent into the indoor environment from the fresh air duct;

[0062] The fresh air function can be specifically turned on when a set start instruction is received. The set start instruction can be issued by the user based on their actual needs through a remote control, a wired controller or other control terminals connected to the air conditioner, or can be generated based on the monitoring data of the indoor environment of the air conditioner. For example, when it is monitored that the pollutant concentration in the indoor environment is greater than or equal to the set threshold, the set start instruction here can be generated.

[0063] When the fresh air function is turned on, control the fresh air fan in the fresh air duct to start, and both the fresh air inlet and the fresh air outlet connected to the fresh air duct are opened. Then the fresh air fan drives the outdoor fresh air into the fresh air duct and sends it into the indoor environment through the fresh air outlet.

[0064] The indoor temperature can be specifically detected by a temperature sensor provided at the air conditioner return air outlet, or can also be detected by a temperature sensor located outside the air conditioner in the space where the air conditioner acts. The fresh air temperature can be specifically detected by a temperature sensor provided on the fresh air duct or the fresh air inlet, or can also be obtained by obtaining the detection data of a temperature sensor set outdoors, or can also obtain the outdoor environmental temperature detected from the weather monitoring data of the area where the air conditioner is located as the fresh air temperature. It should be noted that the indoor temperature and the fresh air temperature here are obtained synchronously.

[0065] When the fresh air function is turned on, the indoor temperature and the fresh air temperature can be detected in real time or at intervals set by the user. When the indoor temperature and the fresh air temperature are being detected, the passage opening between the fresh air duct and the indoor return air duct is in a closed state.

[0066] When the fresh air function is turned on, the internal circulation temperature regulation function of the air conditioner can be turned on or off according to the actual needs of the user. Specifically, when the internal circulation temperature regulation function of the air conditioner is turned on, the compressor and the indoor fan are turned on. The indoor fan drives the air in the indoor environment into the indoor return air duct, and after heat exchange through the indoor heat exchanger, it enters the indoor environment from the air supply outlet to adjust the indoor environment temperature. Here, when the fresh air function and the internal circulation temperature regulation function are turned on simultaneously, if the passage opening between the fresh air duct and the indoor return air duct is closed, then the fresh air supply and the internal circulation supply are independent of each other and do not interfere with each other. When the internal circulation temperature regulation function of the air conditioner is turned off, the compressor and the indoor fan are turned off.

[0067] Step S20: Determine the target control temperature and its corresponding target dew point temperature according to the indoor temperature and the fresh air temperature;

[0068] Since the indoor and outdoor temperatures are different, the conditions required for the air conditioner to condense are different. Based on this,

[0069] Different indoor temperatures and different fresh air temperatures correspond to different target control temperatures. Different indoor temperatures and different fresh air temperatures correspond to different target dew point temperatures. Specifically, the target control temperature and the target dew point temperature can be determined based on the magnitude relationship between the indoor temperature and the fresh air temperature. Different magnitude relationships result in different target control temperatures and target dew point temperatures; the target control temperature and the target dew point temperature can also be determined based on the quantitative relationship (such as difference, ratio) between the indoor temperature and the fresh air temperature. Different quantitative relationships result in different target control temperatures and target dew point temperatures.

[0070] The target control temperature determined based on the indoor temperature and the fresh air temperature can be one of the indoor temperature and the fresh air temperature, or it can be a temperature calculated through a preset formula by comprehensively considering the indoor temperature and the fresh air temperature.

[0071] The target dew point temperature determined based on the indoor temperature and the fresh air temperature can be one of the indoor dew point temperature and the fresh air dew point temperature, or it can be a temperature calculated through a preset formula by comprehensively considering the indoor dew point temperature and the fresh air dew point temperature. The indoor dew point temperature can be calculated based on the temperature and humidity of the indoor air, or the temperature corresponding to the current indoor temperature can be determined based on a pre-stored first correspondence relationship as the indoor dew point temperature; the fresh air dew point temperature is calculated based on the temperature and humidity of the fresh air, or the temperature corresponding to the fresh air temperature can be determined based on a pre-stored second correspondence relationship as the indoor dew point temperature.

[0072] Step S30: When the target control temperature is less than or equal to the target dew point temperature, open the ventilation opening or stop introducing fresh air. When the ventilation opening is open, the air in the indoor return air duct enters the fresh air duct and mixes with the fresh air.

[0073] When the target dew point temperature is greater than or equal to the target control temperature, it indicates that there is a risk of condensation in the air conditioner currently, and condensation is likely to occur in the fresh air duct or at the fresh air outlet; when the target control temperature is greater than the target dew point temperature, it indicates that there is no risk of condensation in the air conditioner currently, and condensation is not likely to occur in the fresh air duct or at the fresh air outlet. Here, the condensation risk specifically refers to the state where condensation has occurred in the air conditioner or condensation will occur within a period of time less than or equal to the set duration when operating in the current state.

[0074] When it is determined that there is a condensation risk in the air conditioner based on the target dew point temperature and the target control temperature, the valve provided for controlling the ventilation opening can also be controlled to open. When the valve is open, the air in the indoor return air duct enters the fresh air duct under the driving action of the fresh air fan and mixes with the fresh air coming in from the outside. The deviation between the temperature and humidity of the mixed fresh air and the indoor temperature and humidity is reduced, thereby effectively avoiding condensation in the fresh air duct or at the fresh air outlet.

[0075] When it is determined that there is a condensation risk in the air conditioner based on the target dew point temperature and the target control temperature, the method of opening the ventilation opening or stopping introducing fresh air can be selected based on the size of the condensation risk, can also be selected by the user, and can also be selected based on the on / off state of the internal circulation heat exchange function, etc.

[0076] When the ventilation opening is open, the fresh air fan can operate at the current speed or reduce the speed; if the indoor fan is in the on state, it can operate at the current speed or reduce the speed.

[0077] When it is determined that there is no condensation risk in the air conditioner based on the target dew point temperature and the target control temperature, the air conditioner can be controlled to maintain the current state and supply fresh air.

[0078] A control method for an air conditioner proposed in an embodiment of the present invention is based on an air conditioner provided with a separated fresh air duct and an indoor return air duct, and a ventilation opening is provided between the two ducts. In the process of introducing fresh air from the fresh air duct into the indoor environment, the target control temperature and the corresponding target dew point temperature are determined according to the indoor temperature and the fresh air temperature. When the determined target control temperature is less than or equal to the target dew point temperature, it indicates that there is a condensation risk in the air conditioner. At this time, the method of mixing the indoor return air and the fresh air to adjust the temperature and humidity of the fresh air or stopping introducing fresh air can effectively avoid the condensation phenomenon caused by the difference in temperature and humidity between the fresh air and the indoor air, and ensure the normal operation of the air conditioner.

[0079] Specifically, in this embodiment, step S20 includes:

[0080] Step S21, when the indoor temperature is greater than the fresh air temperature, determine the fresh air temperature as the target control temperature, and obtain the indoor dew point temperature as the target dew point temperature; the indoor dew point temperature is determined according to the indoor temperature and indoor humidity;

[0081] The indoor humidity here can be detected simultaneously with the indoor temperature detection, specifically, it can be detected by a humidity sensor arranged at the return air outlet of the air conditioner.

[0082] Different indoor temperatures and different indoor humidities correspond to different indoor dew point temperatures. The indoor dew point temperature can be determined through the indoor temperature, indoor humidity, and a preset relationship, for example, determining the indoor dew point temperature corresponding to the current indoor humidity and indoor temperature based on a pre-set formula or mapping relationship.

[0083] Step S22, when the indoor temperature is less than the fresh air temperature, determine the indoor temperature as the target control temperature, and obtain the fresh air dew point temperature as the target dew point temperature; the fresh air dew point temperature is determined according to the fresh air temperature and fresh air humidity.

[0084] The fresh air humidity here can be detected simultaneously with the fresh air temperature detection, specifically, it can be detected by a humidity sensor arranged in the fresh air duct of the air conditioner.

[0085] Different fresh air temperatures and different fresh air humidities correspond to different fresh air dew point temperatures. The fresh air dew point temperature can be determined through the fresh air temperature, fresh air humidity, and a preset relationship, for example, determining the fresh air dew point temperature corresponding to the current fresh air humidity and fresh air temperature based on a pre-set formula or mapping relationship.

[0086] In this embodiment, the lower temperature among the indoor temperature and the fresh air temperature is selected as the target control temperature, and the target dew point temperature is determined based on the higher temperature among the indoor temperature and the fresh air temperature and its corresponding humidity. Based on this, it can be ensured that regardless of how the indoor and outdoor temperature and humidity change, the condensation risk existing in the air conditioner can be accurately identified through the target control temperature and the target dew point temperature, and the ventilation opening can be opened or the fresh air can be turned off in a timely manner to ensure that the air conditioner will not condensate during the fresh air introduction process under any operating conditions.

[0087] Further, based on the above embodiment, another embodiment of the control method of the air conditioner of the present application is proposed. In this embodiment, referring to Figure 4 , defining the opening of the ventilation opening in the above step S30 as step S30a, after the step S20, the following steps are further included:

[0088] Step S31, when the target control temperature is less than or equal to the target dew point temperature, determine the deviation amount between the target control temperature and the target dew point temperature;

[0089] The deviation amount here is specifically the absolute value of the difference between the target dew point temperature and the target control temperature.

[0090] Step S32, determine whether the deviation amount is less than or equal to a preset deviation threshold;

[0091] When the deviation amount is less than or equal to the preset deviation threshold, when the deviation amount is greater than the preset deviation threshold, execute step S33.

[0092] The preset deviation threshold is specifically a critical parameter used to distinguish the size of the condensation risk of the air conditioner when there is a condensation risk in the air conditioner. The specific size of the preset deviation threshold can be set according to actual needs. If the target control temperature and the target dew point temperature are different, the corresponding preset deviation threshold may not be the same. When the preset deviation threshold is greater than or equal to the deviation amount, it indicates that the condensation risk caused by the introduction of fresh air in the air conditioner is relatively small. When the preset deviation threshold is less than the deviation amount, it indicates that the condensation risk caused by the introduction of fresh air in the air conditioner is relatively large.

[0093] Step S30a, open the ventilation opening;

[0094] Step S33, stop introducing fresh air.

[0095] When it is determined that there is a condensation risk in the air conditioner based on the target dew point temperature and the target control temperature, the fresh air fan can be controlled to close and / or the fresh air inlet can be closed to stop the outdoor fresh air from entering the air conditioner, so as to avoid the condensation of the fresh air duct caused by the indoor and outdoor temperature and humidity differences between the outdoor fresh air and the components in the fresh air duct close to room temperature, and also avoid the condensation of the fresh air outlet caused by the temperature and humidity differences between the fresh air sent from the fresh air outlet into the room and the indoor air, resulting in water blowing from the air conditioner.

[0096] For example, the indoor temperature is T1, the fresh air temperature is T2, the indoor humidity is H1, and the fresh air humidity is H2. T1L is the indoor dew point temperature calculated based on T1 and H1, and T2L is the fresh air dew point temperature calculated based on T2 and H2. Based on this, when T1>T2, T2 is the target control temperature and T1L is the target dew point temperature. If T2<T1L≤T2 + 5, control the valve of the ventilation opening to open. If T1L>T2 + 5, close the fresh air fan. When T2>T1, T1 is the target control temperature and T2L is the target dew point temperature. If T1<T2L≤T1 + 3, control the valve of the ventilation opening to open. If T2L>T2 + 3, close the fresh air fan.

[0097] In this embodiment, the condensation risk level of the air conditioner is characterized based on the deviation amount, and different control methods are adopted for the fresh air intake operation of the air conditioner based on the condensation risk level. Among them, when the risk is relatively small, while retaining the fresh air intake function, the condensation risk of the air conditioner is eliminated by mixing the indoor return air and the fresh air. When the risk is relatively large, the fresh air function is turned off, so as to ensure that the air conditioner does not have a condensation risk and maintain the supply of fresh air to the room as much as possible, effectively balancing the requirements for indoor air freshness and anti-condensation.

[0098] Further, in any of the above embodiments including this embodiment, a fresh air fan is provided in the fresh air duct. After opening the ventilation opening, the method further includes: reducing the rotation speed of the fresh air fan.

[0099] Specifically, the rotation speed of the fresh air fan can be reduced according to the pre-set fixed rotation speed adjustment parameters, or can be reduced according to the rotation speed adjustment parameters determined according to the actual operating conditions of the air conditioner.

[0100] Here, reducing the rotation speed of the fresh air fan can reduce the introduction of fresh air volume, thereby reducing the condensation risk of the air conditioner and avoiding the condensation phenomenon of the air conditioner.

[0101] In this embodiment, an indoor fan is provided in the indoor return air duct. When the indoor fan is in the on state, the process of reducing the rotation speed of the fresh air fan is as follows: obtaining the current first rotation speed of the indoor fan and the current second rotation speed of the fresh air fan; determining the rotation speed difference between the first rotation speed and the second rotation speed; determining the rotation speed adjustment parameter according to the rotation speed difference and the deviation amount; reducing the rotation speed of the fresh air fan according to the rotation speed adjustment parameter.

[0102] The rotation speed difference here is specifically the absolute value of the difference between the first rotation speed and the second rotation speed. The rotation speed adjustment parameter can specifically include the rotation speed adjustment amplitude, the rotation speed adjustment coefficient, and / or the rotation speed adjustment rate, etc.

[0103] Different rotation speed differences and different deviation amounts correspond to different rotation speed adjustment parameters. The corresponding relationship between the rotation speed difference, the deviation amount, and the rotation speed adjustment parameter can be pre-set, and can be a calculation relationship, a mapping relationship, an algorithm model, etc. Based on the pre-set corresponding relationship, the rotation speed adjustment parameter corresponding to the current rotation speed difference and deviation amount can be determined.

[0104] Among them, the rotation speed adjustment parameter increases with the increase of the deviation amount, and the rotation speed adjustment parameter decreases with the increase of the rotation speed difference.

[0105] Specifically, the target rotational speed adjustment value can be determined based on the deviation amount, the correction value can be determined based on the rotational speed difference, and the result obtained by correcting the target rotational speed adjustment value according to the correction parameter is used as the rotational speed adjustment parameter. Here, the target rotational speed adjustment value increases as the deviation amount increases, and the correction value decreases as the rotational speed difference increases.

[0106] In this embodiment, if the rotational speed deviation between the indoor fan and the fresh air fan is different, the indoor return air volume entering the fresh air duct is different, and if the deviation amount is different, the fresh air condensation risk is different. Based on this, the adjustment parameter for the process of reducing the rotational speed of the fresh air fan is determined according to the rotational speed deviation between the indoor fan and the outdoor fan and the temperature deviation between the target dew point temperature and the target control temperature, ensuring precise control of the process of reducing the rotational speed of the fresh air fan and ensuring that the mixing effect of the indoor return air and the fresh air after the rotational speed of the indoor fan is reduced can reliably prevent the air conditioner from experiencing condensation.

[0107] Further, in this embodiment, after the rotational speed of the fresh air fan is reduced, the rotational speed of the indoor fan can be reduced according to the reduced rotational speed of the fresh air fan, further increasing the air volume of the indoor return air entering the fresh air duct. Through the coordinated cooperation of the fresh air fan and the indoor fan, the reliability of the air conditioner's anti-condensation is further improved.

[0108] Further, based on any of the above embodiments, another embodiment of the control method of the air conditioner of the present application is proposed. In this embodiment, the indoor return air duct is provided with an indoor heat exchanger. Referring to Figure 5 after the step S20, it further includes:

[0109] Step S40, obtaining the on-off state of the compressor of the air conditioner;

[0110] The on-off state here can be obtained by obtaining the control parameters of the air conditioning system, or by monitoring the operating current of the compressor and obtaining the on-off state of the compressor based on the operating current. For example, when the operating current is less than the set current threshold, it is determined that the compressor is in the off state; when the operating current is greater than or equal to the set current threshold, it is determined that the compressor is in the on state.

[0111] Step S50, determining whether the on-off state is the off state;

[0112] When the on-off state is the off state, step S30 is executed; when the on-off state is the on state, step S60 is executed.

[0113] Step S60, controlling the air conditioner to introduce fresh air in the target flow direction, where the target flow direction is that outdoor fresh air enters the indoor return air duct and is sent into the indoor environment after being temperature-adjusted by the indoor heat exchanger.

[0114] When the fresh air function is turned on, the fresh air introduced by the air conditioner is defaultly introduced into the indoor environment in a preset flow direction, where the preset flow direction is the flow direction of the outdoor fresh air mentioned in the above embodiments, which is sent from the fresh air duct into the indoor environment.

[0115] Specifically, when the fresh air function is turned on, the fresh air fan can be turned on and the wind direction switching valve can be controlled to operate at the first valve position. At this time, the outdoor fresh air entering from the fresh air inlet enters the fresh air duct and is sent into the indoor environment through the fresh air outlet. In this state, the indoor temperature and fresh air humidity are obtained in step S10 above. After the target control temperature and the target dew point temperature are determined by the indoor temperature and the fresh air humidity, first obtain the on-off state of the compressor. If the compressor is in the off state, the above step S30 can be executed; if the compressor is in the on state, the wind direction switching valve can be controlled to switch from the first valve position to the second valve position to operate. At this time, the outdoor fresh air entering from the fresh air inlet enters the indoor return air duct and is sent into the indoor environment from the air supply outlet after heat exchange through the indoor heat exchanger.

[0116] Among them, while controlling the air conditioner to introduce fresh air in the target flow direction, the fresh air fan can be controlled to turn off. The compressor can be turned on or off according to the actual temperature comfort requirements of indoor users. For example, the compressor is turned on when the internal circulation temperature adjustment function is turned on, and the compressor is turned off when the internal circulation temperature adjustment function is turned off.

[0117] In this embodiment, based on the on-off state of the compressor, the means for preventing condensation of the air conditioner is selected. When the compressor is turned on, the fresh air and the indoor return air are preferentially mixed and then heat-exchanged through the indoor heat exchanger and sent into the indoor environment, which can ensure the freshness of the indoor environmental air and at the same time ensure that the introduction of fresh air will not cause the condensation phenomenon of the air conditioner, and can ensure the temperature comfort of indoor users during the process of sending fresh air; when the compressor is turned off, the fresh air adopts an independent air supply method, and when there is a risk of condensation, the operation of introducing fresh air is adjusted, which can ensure the introduction amount of fresh air and ensure the freshness of the indoor environment.

[0118] Further, in this embodiment, before step S60, it further includes:

[0119] When the on-off state is the on state, determine the temperature difference between the fresh air temperature and the set temperature of the air conditioner; when the temperature difference is greater than or equal to the set temperature difference threshold, execute the step of controlling the air conditioner to introduce fresh air in the target flow direction; when the temperature difference is less than the set temperature difference threshold, if the target control temperature is less than or equal to the target dew point temperature, open the ventilation opening.

[0120] The set temperature here is specifically the target value of the temperature required to be reached in the indoor environment of the air conditioner set in advance. The set temperature difference threshold can be set according to actual needs.

[0121] Here, it is set that the temperature difference threshold is less than or equal to the temperature difference, indicating that the fresh air temperature is too cold or too hot. Directly sending it into the room will affect the temperature comfort of indoor users. At this time, the fresh air is introduced into the indoor return air duct, mixed with the indoor return air, and then sent into the room together after heat exchange through the indoor heat exchanger, which can ensure the temperature comfort of indoor users during the process of sending fresh air. When the set temperature difference threshold is greater than the temperature difference, it indicates that the fresh air temperature is close to the indoor temperature, and directly sending it into the room will not affect the temperature comfort of indoor users. At this time, the fresh air maintains the preset flow direction and is sent into the room from the fresh air duct in a separate air supply manner, which can ensure a large fresh air supply volume to meet the freshness of indoor air while ensuring the heat exchange efficiency of the internal circulation. On this basis, when there is a risk of condensate in the fresh air, the vent is opened to mix the air in the indoor return air duct with the fresh air, so as to ensure the freshness of indoor air while ensuring that the air conditioner does not condensate.

[0122] Based on any of the above embodiments, the air conditioner includes a housing. The housing is provided with a first return air inlet, a second return air inlet, and a fresh air outlet. The fresh air duct is communicated with the fresh air outlet. Both the first return air inlet and the second return air inlet are communicated with the indoor return air duct. The indoor temperature is detected by a temperature sensor arranged at the target return air inlet, and the indoor humidity is detected by a humidity sensor arranged at the target return air inlet. The target return air inlet is the one of the first return air inlet and the second return air inlet that is farther from the fresh air outlet. Define the distance between the first return air inlet and the fresh air outlet as the first distance, and define the distance between the second return air inlet and the fresh air outlet as the second distance. If the first distance is greater than the second distance, then the first return air inlet is the target return air inlet; if the first distance is less than the second distance, then the second return air inlet is the target return air inlet. Based on this, by detecting the indoor temperature and humidity through the sensor far from the fresh air outlet, the influence of the fresh air on the detection of indoor temperature and humidity can be reduced, the accuracy of the indoor temperature and humidity detection results can be ensured, so as to improve the accuracy of the determined target control temperature and target dew point temperature and the accuracy of identifying the air conditioner condensate risk based on the target control temperature and target dew point temperature, and ensure that the regulation of the air conditioner based on the identification result can ensure that the air conditioner does not condensate.

[0123] In addition, an embodiment of the present invention further provides a computer-readable storage medium, on which a control program of the air conditioner is stored. When the control program of the air conditioner is executed by a processor, the relevant steps of any of the above embodiments of the control method of the air conditioner are realized.

[0124] It should be noted that in this text, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, such that a process, method, article or system comprising a series of elements not only includes those elements but also other elements not expressly listed, or elements inherent to such process, method, article or system. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or system comprising such element.

[0125] The serial numbers of the above embodiments of the present invention are only for description and do not represent the superiority or inferiority of the embodiments.

[0126] Through the description of the above embodiments, those skilled in the art can clearly understand that the above embodiment methods can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation. Based on such understanding, the technical solution of the present invention, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium as described above (such as ROM / RAM, magnetic disk, optical disc) and includes several instructions for causing a terminal device (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0127] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A control method for an air conditioner, characterized in that, The air conditioner is provided with a separated fresh air duct and an indoor return air duct. There is a ventilation opening between the fresh air duct and the indoor return air duct. The indoor return air duct is provided with an indoor heat exchanger. The control method of the air conditioner includes the following steps: When the fresh air function is in the on state, obtain the indoor temperature and the fresh air temperature; when the fresh air function is turned on, outdoor fresh air is sent into the indoor environment from the fresh air duct; Determine the target control temperature and its corresponding target dew point temperature according to the indoor temperature and the fresh air temperature; Obtain the on-off state of the compressor of the air conditioner; When the on-off state is the off state and the target control temperature is less than or equal to the target dew point temperature, open the ventilation opening or stop introducing fresh air. When the ventilation opening is open, the air in the indoor return air duct enters the fresh air duct and mixes with the fresh air; When the on-off state is the on state, control the air conditioner to introduce fresh air in a target flow direction, and the target flow direction is that outdoor fresh air enters the indoor return air duct, is temperature-adjusted by the indoor heat exchanger, and then is sent into the indoor environment.

2. The control method of the air conditioner according to claim 1, wherein The step of determining the target control temperature and its corresponding target dew point temperature according to the indoor temperature and the fresh air temperature includes: When the indoor temperature is greater than the fresh air temperature, determine the fresh air temperature as the target control temperature, and obtain the indoor dew point temperature as the target dew point temperature; the indoor dew point temperature is determined according to the indoor temperature and the indoor humidity; When the indoor temperature is less than the fresh air temperature, determine the indoor temperature as the target control temperature, and obtain the fresh air dew point temperature as the target dew point temperature; the fresh air dew point temperature is determined according to the fresh air temperature and the fresh air humidity.

3. The control method of the air conditioner according to claim 1, characterized in that, The step of opening the ventilation opening or stopping introducing fresh air when the target control temperature is less than or equal to the target dew point temperature includes: When the target control temperature is less than or equal to the target dew point temperature, determine the deviation amount between the target control temperature and the target dew point temperature; When the deviation amount is less than or equal to a preset deviation threshold, open the ventilation opening; When the deviation amount is greater than the preset deviation threshold, stop introducing fresh air.

4. The control method of the air conditioner according to claim 3, characterized in that, A fresh air fan is provided in the fresh air duct. After the step of opening the ventilation opening, it further includes: Reduce the rotation speed of the fresh air fan.

5. The control method of the air conditioner according to claim 4, wherein An indoor fan is provided in the indoor return air duct. The step of reducing the rotation speed of the fresh air fan includes: Obtain the current first rotation speed of the indoor fan and the current second rotation speed of the fresh air fan; Determine the rotation speed difference between the first rotation speed and the second rotation speed; Determine the rotation speed adjustment parameter according to the rotation speed difference and the deviation amount; Reduce the rotation speed of the fresh air fan according to the rotation speed adjustment parameter.

6. The control method of the air conditioner according to claim 1, wherein Before the step of controlling the air conditioner to introduce fresh air in a target flow direction, it further includes: When the on-off state is the on state, determine the temperature difference between the fresh air temperature and the set temperature of the air conditioner; When the temperature difference is greater than or equal to a set temperature difference threshold, execute the step of controlling the air conditioner to introduce fresh air in a target flow direction; When the temperature difference is less than the set temperature difference threshold, if the target control temperature is less than or equal to the target dew point temperature, the ventilation opening is opened.

7. The control method of the air conditioner according to any one of claims 1 to 6, characterized in that, The air conditioner includes a housing, the housing is provided with a first air return opening, a second air return opening and a fresh air outlet, the fresh air duct is communicated with the fresh air outlet, both the first air return opening and the second air return opening are communicated with the indoor air return duct, the indoor temperature is detected by a temperature sensor arranged at the target air return opening, and the target air return opening is the one of the first air return opening and the second air return opening that is farther from the fresh air outlet.

8. An air conditioner, characterized in that, The air conditioner includes a housing and a control device, a fresh air duct and an indoor air return duct are arranged in the housing, a ventilation opening is arranged between the fresh air duct and the indoor air return duct, and a valve is arranged at the ventilation opening to open or close the ventilation opening; The valve is connected to the control device, the control device includes: a memory, a processor, and a control program of the air conditioner stored on the memory and executable on the processor, and when the control program of the air conditioner is executed by the processor, the steps of the control method of the air conditioner according to any one of claims 1 to 7 are implemented.

9. A computer-readable storage medium, characterized in that, A control program of the air conditioner is stored on the computer-readable storage medium, and when the control program of the air conditioner is executed by the processor, the steps of the control method of the air conditioner according to any one of claims 1 to 7 are implemented.

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