Air conditioner and fresh air control method thereof

Abstract

The present invention proposes an air conditioner and a fresh air control method thereof, wherein the air conditioner includes a controller, which is configured to: when the fresh air fan is started, when the first temperature difference meets the triggering condition of the fresh air anti-condensation function, or when the second temperature difference meets the triggering condition of the fresh air anti-condensation function, turn on the fresh air anti-condensation function and obtain the indoor carbon dioxide concentration value; compare the concentration value with a preset concentration threshold, and control the movement position of the fresh air guide plate and / or the rotation speed and running time of the fresh air fan according to the concentration value and the preset concentration threshold, until the concentration value meets the preset condition and the fresh air fan is turned off, control the air conditioner to exit the fresh air anti-condensation function. The air conditioner takes into account the user's demand for fresh air intake and anti-condensation demand, controls the movement position of the fresh air guide plate and / or the rotation speed and running time of the fresh air fan, reduces the condensation risk while ensuring the fresh air intake, and thus improves the user experience.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an air conditioner and a fresh air control method thereof. Background Art

[0002] The use environment of air conditioners with fresh air function is complex, and the indoor and outdoor environmental parameters vary greatly, which makes it easy for fresh air to condense near the fresh air duct and fresh air outlet when fresh air is introduced. The condensed water will wet the cabinets, floors, walls and other places in the room when the fresh air is delivered and blown out, which greatly affects the user's experience of the fresh air function of the air conditioner. Among them, condensation occurs more often. For example, in summer, the outdoor fresh air temperature is higher than the indoor ambient temperature, and the fresh air dew point temperature is higher than the indoor ambient temperature or higher than the temperature of the inner wall of the fresh air duct. As the fresh air is delivered, its own temperature decreases with the exchange of heat. When its own temperature is lower than the dew point temperature, dew is precipitated due to reaching the saturation state, and condenses at the fresh air outlet or the inner wall of the fresh air duct.

[0003] During the development process of the above-mentioned air conditioners, in order to cater to user needs, the fresh air volume of the air conditioners is getting larger and larger, resulting in an increasingly acute contradiction of fresh air condensation. Since the air conditioners with fresh air function are self-centered and the fresh air function is auxiliary, the fresh air space structure and functional cost of the air conditioners are limited, and the effectively verified fresh air anti-condensation method cannot be applied to the air conditioners with fresh air function. For example, the fresh air pretreatment method uses a cooling or heating module to pretreat the fresh air introduced into the room to the required state and then sends it into the room, thereby reducing the asymmetry between the fresh air and the indoor environmental parameters. Commonly used cooling modules include thermoelectric cooling modules, heating modules include thermoelectric heating modules, or independent heat pump circulation systems, or fresh air treatment heat exchangers connected in parallel with the air conditioner heat exchangers, or combined with the air path design, a full heat exchanger is set to pretreat the fresh air and reduce condensation.

[0004] The above-mentioned fresh air pretreatment scheme will add a lot of hardware equipment. Due to insufficient space and cost constraints of the air conditioner, it cannot be used on the air conditioner. At present, the common solution to reduce condensation is usually to control the start and stop of the fresh air fan to reduce the risk of condensation. At the same time, the locations prone to condensation are insulated with sponges or flocking cloth to reduce condensation. However, although controlling the start and stop of the fresh air fan reduces the probability of fresh air condensation to a certain extent, controlling the start and stop of the fresh air fan will affect the introduction of fresh air, resulting in insufficient fresh air volume, thereby reducing the user experience. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0006] To this end, an object of the present invention is to provide an air conditioner that does not require additional hardware and reduces the risk of condensation while ensuring the fresh air intake, thereby improving user experience.

[0007] To this end, a second object of the present invention is to provide a fresh air control method for an air conditioner.

[0008] In order to achieve the above-mentioned purpose, an embodiment of the first aspect of the present invention proposes an air conditioner, which includes a refrigerant circulation loop, so that the refrigerant circulates in a loop composed of a compressor, a condenser, an expansion valve, an evaporator and a four-way valve; a compressor, which is used to compress low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas and discharge it to the condenser; an outdoor heat exchanger and an indoor heat exchanger, one of which works as a condenser and the other works as an evaporator; a four-way valve, which is used to control the flow direction of the refrigerant in the refrigerant loop so that the outdoor heat exchanger and the indoor heat exchanger can switch between the condenser and the evaporator; a carbon dioxide concentration detection module, which is used to detect the concentration value of indoor carbon dioxide; a fresh air fan, which is used to adjust the fresh air Air intake volume; a fresh air guide plate for adjusting the fresh air direction; the controller is configured as follows: when the fresh air fan is started, if the first temperature difference between the indoor dew point temperature and the fresh air temperature meets the triggering condition of the fresh air anti-condensation function, or the second temperature difference between the fresh air dew point temperature and the indoor ambient temperature meets the triggering condition of the fresh air anti-condensation function, the fresh air anti-condensation function is turned on, and the indoor carbon dioxide concentration value is obtained; the concentration value is compared with a preset concentration threshold, and according to the relationship between the concentration value and the preset concentration threshold, the movement position of the fresh air guide plate and / or the speed and running time of the fresh air fan are controlled, until the concentration value meets the preset condition and the fresh air fan is turned off, and the air conditioner is controlled to exit the fresh air anti-condensation function.

[0009] According to the air conditioner of the embodiment of the present invention, when the first temperature difference or the second temperature difference meets the trigger condition of the fresh air anti-condensation function, it is determined that the air conditioner turns on the fresh air anti-condensation function, and takes the indoor carbon dioxide concentration value as the control target, taking into account the user's demand for fresh air intake volume and anti-condensation demand, and according to the relationship between the indoor carbon dioxide concentration value and the preset concentration threshold, the movement position of the fresh air guide plate and / or the speed and operating time of the fresh air fan are controlled, so as to reduce the condensation risk while ensuring the fresh air intake volume, thereby improving the user experience.

[0010] In some embodiments, when controlling the movement position of the fresh air guide plate and / or the speed and operation time of the fresh air fan according to the magnitude relationship between the concentration value and the preset concentration threshold, the controller is specifically configured as follows: when the concentration value exceeds a first preset concentration threshold, controlling the air supply angle of the fresh air guide plate to move to a first preset position, wherein when the concentration value exceeds the first preset concentration threshold, controlling the air supply angle of the fresh air guide plate to move to the first preset position, wherein when the air supply angle of the fresh air guide plate moves to the first preset position, the air conditioner generates the least condensation at the fresh air outlet; When the concentration value does not exceed the second preset concentration threshold, the speed of the fresh air fan is controlled to be reduced to the first preset speed; when the concentration value is between the first preset concentration threshold and the second preset concentration threshold, the fresh air fan is controlled to run at the second preset speed for a first preset time, the indoor fan of the air conditioner is controlled to start, and the air guide plate of the air conditioner is controlled to move to a second preset position, wherein the first preset concentration threshold is higher than the second preset concentration threshold, the first preset speed is lower than the second preset speed, and the second preset position is the preset position where the air volume of the air conditioner is maximum.

[0011] In some embodiments, after controlling the fresh air guide plate to move to a first preset position, the controller is further configured to: obtain the indoor carbon dioxide concentration value again after the time when the fresh air guide plate moves to the first preset position reaches a second preset time; and control the movement position of the fresh air guide plate and / or the speed and operating time of the fresh air fan based on the relationship between the concentration value obtained again and the first preset concentration threshold and the second preset concentration threshold.

[0012] In some embodiments, when controlling the fresh air guide plate and / or the fresh air fan to execute the second control strategy, the controller is configured as follows: when the concentration value exceeds the first preset concentration threshold, controlling the fresh air guide plate to move to the first preset position, controlling the indoor fan of the air conditioner to start, and controlling the guide plate of the air conditioner to move to the second preset position, until the concentration value is lower than the second preset concentration threshold, controlling the fresh air fan to reduce to the first preset speed; when the concentration value does not exceed the second preset concentration threshold, controlling the speed of the fresh air fan to reduce to the first preset speed; when the concentration value is between the first preset concentration threshold and the second preset concentration threshold, controlling the fresh air fan to run at the second preset speed for a third preset time, controlling the indoor fan of the air conditioner to start, and controlling the guide plate of the air conditioner to move to the second preset position, until the concentration value is lower than the second preset concentration threshold, controlling the fresh air fan to reduce to the first preset speed.

[0013] In some embodiments, the air conditioner also includes: an indoor ambient temperature sensor for detecting the indoor ambient temperature; an outdoor ambient temperature sensor for detecting the outdoor ambient temperature; an indoor humidity sensor for detecting the indoor ambient relative humidity; an outdoor humidity sensor for detecting the outdoor ambient relative humidity, and the controller is also configured to: before turning on the fresh air anti-condensation function, obtain the outdoor ambient temperature, the indoor ambient temperature, the outdoor ambient relative humidity and the indoor ambient relative humidity; determine the fresh air temperature according to the outdoor ambient temperature and the indoor ambient temperature; determine the fresh air dew point temperature or the indoor dew point temperature according to the fresh air temperature and the indoor ambient temperature; determine the first temperature difference according to the indoor dew point temperature and the fresh air temperature, or determine the second temperature difference according to the fresh air dew point temperature and the indoor ambient temperature.

[0014] In some embodiments, when the fresh air dew point temperature or the indoor dew point temperature is determined according to the fresh air temperature and the indoor ambient temperature, the controller is configured as follows: when the fresh air temperature exceeds the indoor ambient temperature, the fresh air dew point temperature is determined according to the outdoor ambient relative humidity and the fresh air temperature; when the fresh air temperature does not exceed the indoor ambient temperature, the indoor dew point temperature is determined according to the indoor ambient relative humidity and the indoor ambient temperature.

[0015] In some embodiments, the controller is configured to: if the first temperature difference does not meet the triggering condition of the fresh air anti-condensation function, or the second temperature difference does not meet the triggering condition of the fresh air anti-condensation function, control the air conditioner to continue operating in the initial state.

[0016] In some embodiments, the triggering condition of the fresh air anti-condensation function includes: the first temperature difference or the second temperature difference is greater than a preset temperature difference threshold.

[0017] In order to achieve the above-mentioned purpose, an embodiment of the second aspect of the present invention proposes a fresh air control method for an air conditioner, which method includes: when the fresh air fan is started, if the first temperature difference between the indoor dew point temperature and the fresh air temperature meets the trigger condition of the fresh air anti-condensation function, or the second temperature difference between the fresh air dew point temperature and the indoor ambient temperature meets the trigger condition of the fresh air anti-condensation function, the fresh air anti-condensation function is turned on, and the indoor carbon dioxide concentration value is obtained; the concentration value is compared with a preset concentration threshold, and according to the size relationship between the concentration value and the preset concentration threshold, the movement position of the fresh air guide plate and / or the speed and running time of the fresh air fan are controlled, until the concentration value meets the preset condition and the fresh air fan is turned off, and the air conditioner is controlled to exit the fresh air anti-condensation function.

[0018] According to the fresh air control method of the air conditioner according to the embodiment of the present invention, when the first temperature difference or the second temperature difference meets the triggering condition of the fresh air anti-condensation function, it is determined that the air conditioner turns on the fresh air anti-condensation function, and the indoor carbon dioxide concentration value is used as the control target, taking into account the user's demand for fresh air intake volume and anti-condensation demand, and according to the relationship between the indoor carbon dioxide concentration value and the preset concentration threshold, the movement position of the fresh air guide plate and / or the speed and running time of the fresh air fan are controlled, so as to reduce the condensation risk while ensuring the fresh air intake volume, thereby improving the user experience.

[0019] In some embodiments, when the concentration value exceeds a first preset concentration threshold, the air supply angle of the fresh air guide plate is controlled to move to a first preset position, wherein the air supply angle of the fresh air guide plate is controlled to move to the first preset position, wherein when the air supply angle of the fresh air guide plate moves to the first preset position, the air conditioner generates the least condensation at the fresh air outlet; when the concentration value does not exceed a second preset concentration threshold, the speed of the fresh air fan is controlled to be reduced to a first preset speed; when the concentration value is between the first preset concentration threshold and the second preset concentration threshold, the fresh air fan is controlled to run at a second preset speed for a first preset time, the indoor fan of the air conditioner is controlled to start, and the air guide plate of the air conditioner is controlled to move to a second preset position, wherein the first preset concentration threshold is higher than the second preset concentration threshold, the first preset speed is less than the second preset speed, and wherein the second preset position is the preset position where the air volume of the air conditioner is maximum.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0022] Figure 1 is a schematic diagram of the hardware structure of an air conditioner according to an embodiment of the present invention;

[0023] Figure 2 is a schematic diagram of the appearance of an air conditioner with a fresh air function according to an embodiment of the present invention;

[0024] Figure 3 is a schematic diagram of the appearance of an air conditioner with a fresh air function according to another embodiment of one embodiment of the present invention;

[0025] Figure 4 is a block diagram of an air conditioner according to an embodiment of the present invention;

[0026] Figure 5 is a flow chart of a fresh air control method for an air conditioner according to an embodiment of the present invention;

[0027] Figure 6 is a schematic diagram of the corresponding relationship between relative humidity and dew point temperature according to an embodiment of the present invention;

[0028] Figure 7 is a flow chart of a fresh air control method according to an embodiment of the present invention;

[0029] Figure 8 is a flow chart of a fresh air control method for an air conditioner according to an embodiment of the present invention. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0032] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] The air conditioner of the present invention performs a refrigeration cycle of the air conditioner by using a compressor, a condenser, an expansion valve and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion and evaporation, and supplies refrigerant to the air that has been conditioned and heat-exchanged.

[0035] The compressor compresses the refrigerant gas in a high temperature and high pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0036] The expansion valve expands the high-temperature and high-pressure liquid refrigerant condensed in the condenser into a low-temperature and low-pressure liquid refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the low-temperature and low-pressure refrigerant gas to the compressor. The evaporator can achieve a cooling effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled. In the entire cycle, the air conditioner can adjust the temperature of the indoor space.

[0037] The outdoor unit of the air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.

[0038] The indoor heat exchanger and the outdoor heat exchanger function as a condenser or an evaporator. When the indoor heat exchanger functions as a condenser, the air conditioner functions as a heater in a heating mode, and when the indoor heat exchanger functions as an evaporator, the air conditioner functions as a cooler in a cooling mode.

[0039] In the related art, in order to prevent condensation during the operation of the air conditioner, preventing fresh air condensation is taken as the main control target, ignoring the problem that the fresh air intake volume is reduced during the operation of the air conditioner, resulting in poor user experience. When the demand for fresh air intake volume is high and the risk of condensation is high, the problem of insufficient fresh air intake volume is very likely to occur. For example, after determining that the probability of condensation is greater than zero, the fresh air fan is controlled to reduce its speed. Although reducing the speed of the fresh air fan can alleviate the risk of condensation, it is easy to cause the problem of insufficient fresh air intake volume, affecting the user experience.

[0040] Therefore, the air conditioner in the embodiment of the present invention takes the carbon dioxide concentration as the control target, judges the condensation risk according to the relationship between the indoor carbon dioxide concentration and the preset concentration value, and enters the fresh air anti-condensation control when the condensation risk is determined to be high, so as to control the rotation speed and operating time of the fresh air fan and / or the movement position of the fresh air guide plate, thereby improving the user experience while ensuring the fresh air intake volume to the greatest extent.

[0041] The hardware structure of the air conditioner according to the embodiment of the present invention is first described below. Figure 1As shown, it is a schematic diagram of the hardware structure of an air conditioner according to an embodiment of the present invention. The air conditioner is composed of a compressor 12, an outdoor heat exchanger 13, an indoor heat exchanger 14, an outdoor fan 20, an indoor fan 21, a throttling mechanism 22 and a fresh air system, wherein the fan type can be selected according to the air supply form, for example, the indoor fan adopts a cross-flow fan, and the outdoor fan is an axial flow fan. The motor driving the fan can be a DC motor or an AC motor, and the throttling mechanism is divided into a fixed throttling mechanism and a variable throttling mechanism, such as a capillary tube or a throttling short tube, and a variable throttling mechanism such as an electronic expansion valve, and the fresh air system includes a fresh air fan 17, a fresh air duct 25 and a fresh air filter 26 and other main components. The fresh air fan is different according to the different fresh air ducts, for example, a centrifugal fan is selected, and the movement of the fresh air fan is powered by the indoor control board and driven according to a preset control program.

[0042] like Figure 2 FIG. 1 is a schematic diagram of the appearance of an air conditioner with a fresh air function according to an embodiment of the present invention. Figure 2 It can be seen that the air conditioner is equipped with a carbon dioxide concentration detection device, which is integrated into the indoor electronic control of the air conditioner. The carbon dioxide concentration value can be directly displayed on the display panel of the air conditioner, wherein the fresh air duct is integrated on one side of the air duct of the air conditioner.

[0043] like Figure 3 , which is a schematic diagram of the appearance of an air conditioner with a fresh air function according to another embodiment of the present invention, wherein the fresh air duct is hidden inside the air guide plate.

[0044] Based on the structure of the air conditioner described above, the fresh air control of the air conditioner according to the embodiment of the present invention is described below by way of example.

[0045] Reference below Figure 1 and Figure 4 The air conditioner according to the embodiment of the present invention is described. Figure 1 and Figure 4 The air conditioner 1 of the embodiment of the present invention comprises: a refrigerant circulation loop 11, a compressor 12, an outdoor heat exchanger 13, an indoor heat exchanger 14, a four-way valve 15, a carbon dioxide concentration detection module 16, a fresh air fan 17, a fresh air guide plate 18 and a controller 19, wherein:

[0046] The refrigerant circulation loop 11 allows the refrigerant to circulate in the loop composed of the compressor, condenser, expansion valve, evaporator and four-way valve; the compressor 12 is used to compress the low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas and discharge it to the condenser; the outdoor heat exchanger 13 and the indoor heat exchanger 14, one of which works as a condenser and the other works as an evaporator; the four-way valve 15 is used to control the flow direction of the refrigerant in the refrigerant loop so that the outdoor heat exchanger and the indoor heat exchanger can be switched between the condenser and the evaporator; the carbon dioxide concentration detection module 16 is used to detect the indoor carbon dioxide concentration value; the fresh air fan 17 is used to adjust the fresh air intake; the fresh air guide plate 18 is used to adjust the direction of fresh air; the controller 19 is configured as follows: when the fresh air fan is started, if the first temperature difference between the indoor dew point temperature and the fresh air temperature meets the trigger condition of the fresh air anti-condensation function, or the second temperature difference between the fresh air dew point temperature and the indoor ambient temperature meets the trigger condition of the fresh air anti-condensation function, the fresh air anti-condensation function is turned on, and the indoor carbon dioxide concentration value is obtained; the concentration value is compared with a preset concentration threshold, and according to the relationship between the concentration value and the preset concentration threshold, the movement position of the fresh air guide plate and / or the speed and running time of the fresh air fan are controlled, until the concentration value meets the preset condition and the fresh air fan is turned off, and the air conditioner is controlled to exit the fresh air anti-condensation function.

[0047] In an embodiment, when the fresh air function of the air conditioner is turned on, the fresh air fan is started. At this time, a first temperature difference between the indoor dew point temperature and the fresh air temperature is calculated, or a second temperature difference between the fresh air dew point temperature and the indoor ambient temperature is calculated, and it is determined whether the first temperature difference or the second temperature difference meets the triggering condition of the fresh air anti-condensation function, that is, whether the first temperature difference or the second temperature difference is greater than the preset temperature difference threshold, and when the temperature difference is greater than the preset temperature difference threshold, it is considered that the condensation risk of the air conditioner is high, and the fresh air anti-condensation function is turned on. At this time, the indoor carbon dioxide concentration value is obtained.

[0048] It can be understood that the indoor carbon dioxide concentration value can be the indoor carbon dioxide concentration value detected at the previous moment, or the indoor carbon dioxide concentration value detected at the current moment. After the indoor carbon dioxide concentration value is detected, the relationship between the carbon dioxide concentration value and the preset concentration threshold is compared. The preset concentration threshold includes a first preset concentration threshold and a second preset concentration threshold. According to the relationship between the carbon dioxide concentration value and different preset concentration thresholds, the operating position of the fresh air guide plate and / or the speed and operating time of the fresh air fan are adaptively controlled until the indoor carbon dioxide concentration value meets the preset conditions. For example, when the indoor carbon dioxide concentration value is lower than the second preset concentration threshold and the fresh air fan is turned off, the air conditioner is controlled to exit the fresh air anti-condensation function. When controlling the operating status of the fresh air guide plate and the fresh air fan, the indoor carbon dioxide concentration value is mainly used as the control target, and the user's demand for the fresh air intake volume is given priority, while taking into account the anti-condensation control. While reducing the risk of fresh air condensation and ensuring the fresh air volume, the user experience is improved. At the same time, there is no need to use sponge or flocking cloth to stick insulation at locations where condensation is prone to occur, thereby ensuring the production rhythm.

[0049] It can be understood that the indoor carbon dioxide concentration value is taken as the first priority of control to ensure the fresh air intake volume. According to the different carbon dioxide concentration values, the movement position of the fresh air guide plate and the speed of the fresh air fan are controlled accordingly. While ensuring the fresh air intake volume, the risk of condensation is reduced, thereby improving the user experience.

[0050] According to the air conditioner of the embodiment of the present invention, when the first temperature difference or the second temperature difference meets the trigger condition of the fresh air anti-condensation function, the air conditioner is determined to turn on the fresh air anti-condensation function, and the indoor carbon dioxide concentration value is used as the control target, taking into account the user's demand for fresh air intake volume and anti-condensation demand, and according to the relationship between the indoor carbon dioxide concentration value and the preset concentration threshold, the movement position of the fresh air guide plate and / or the speed and operating time of the fresh air fan are controlled, so as to reduce the risk of condensation while ensuring the fresh air intake volume, thereby improving the user experience.

[0051] In some embodiments, when controlling the movement position of the fresh air guide plate and / or the speed and running time of the fresh air fan according to the size relationship between the concentration value and the preset concentration threshold, the controller is specifically configured as follows: when the concentration value exceeds the first preset concentration threshold, the air supply angle of the fresh air guide plate is controlled to move to the first preset position, wherein when the air supply angle of the fresh air guide plate moves to the first preset position, the air conditioner generates minimal condensation at the fresh air outlet; when the concentration value does not exceed the second preset concentration threshold, the speed of the fresh air fan is controlled to be reduced to the first preset speed; when the concentration value is between the first preset concentration threshold and the second preset concentration threshold, the fresh air fan is controlled to run at the second preset speed for a second preset time, the indoor fan of the air conditioner is controlled to start, and the air guide plate of the air conditioner is controlled to move to the second preset position, wherein the first preset concentration threshold is higher than the second preset concentration threshold, the first preset speed is less than the second preset speed, and the second preset position is the preset position when the air volume of the air conditioner is maximum.

[0052] In an embodiment, when determining whether the air conditioner turns on the fresh air anti-condensation function, the relationship between the indoor carbon dioxide concentration and the preset concentration is compared. If the indoor carbon dioxide concentration value exceeds the first preset concentration threshold, it is considered that the indoor fresh air volume demand is very high. At this time, in order to ensure the fresh air intake, the air supply angle of the fresh air guide plate is controlled to move to the first preset position. It can be understood that the air supply angles of the fresh air guide blades are different, the flow rates of the fresh air are different, and the contact areas between the fresh air and the fresh air guide plates are different. Therefore, when the air supply angle of the fresh air guide plate moves to the first preset position, the flow rate of the fresh air is smaller and the contact area between the fresh air and the fresh air guide blades is smaller, so that the position where the fresh air outlet produces the least condensation, that is, the position where the condensation produced on the fresh air guide blades is the least, wherein the first preset position can be measured through a large number of experimental results.

[0053] If the indoor carbon dioxide concentration is lower than the second preset concentration threshold, it is considered that the indoor fresh air demand is very low. At this time, the user's demand for fresh air intake is not high, and the fresh air intake can be appropriately reduced to reduce the risk of fresh air condensation. However, the user will not immediately stop the delivery of fresh air intake. At this time, anti-condensation control should be the main focus, and the fresh air fan should be controlled at a reduced speed. For example, the speed of the fresh air fan can be controlled to be reduced to the first preset speed, thereby reducing the supply of fresh air intake and delaying the formation of condensation.

[0054] If the indoor carbon dioxide concentration value CO2 is between the first preset concentration threshold and the second preset concentration threshold, it is considered that there is a demand for indoor fresh air and fresh air anti-condensation control, and the demand is equivalent. If the indoor carbon dioxide concentration value is still high, in order to ensure the user's demand for fresh air intake, choose to quickly reduce the indoor carbon dioxide concentration value. In order to quickly reduce the indoor carbon dioxide concentration value, control the fresh air fan to run at the second preset speed to increase the indoor fresh air intake.

[0055] It can be understood that when the indoor carbon dioxide concentration value is between the first preset concentration threshold and the second preset concentration threshold, the fresh air fan runs at the second preset speed for the first preset time. For example, the fresh air fan increases a certain proportion or shifts up to run for the first preset time. In a short period of time, the fresh air passes through the fresh air outlet at a high speed, increasing the airflow disturbance near the fresh air outlet, shortening the heat exchange time between the fresh air and the structural parts near the fresh air outlet, and condensation cannot be generated and attached in a very short time. The first preset time is very short, such as 5-10 minutes, for example 5 minutes, 7 minutes and 9 minutes.

[0056] At the same time, in order to ensure that condensation does not occur, it is also necessary to control the start-up of the indoor fan of the air conditioner. At this time, the speed of the indoor fan of the air conditioner should be set to the highest speed, and the air guide plate of the air conditioner should be controlled to move to the second preset position. For example, the horizontal air guide plate of the air conditioner is controlled to move to the position of the maximum fresh air inlet volume, and the longitudinal air guide plate moves to the extreme position in the direction of the fresh air outlet. By controlling the air conditioner to deliver air at a large air volume and accelerating the fresh air disturbance near the fresh air outlet to ensure a large air volume of mixed air, the concentration of indoor carbon dioxide can be quickly reduced in a short time, and the risk of fresh air condensation can be reduced.

[0057] During the process of controlling the fresh air fan, the indoor fan and the air guide plate of the air conditioner to perform the above operations, the carbon dioxide concentration detection module, such as the carbon dioxide concentration sensor, detects the concentration value and concentration content of indoor carbon dioxide in real time. If the concentration value of carbon dioxide is lower than the second preset concentration threshold, the control of the fresh air fan to run at the second preset speed is stopped, that is, the control of the fresh air fan to increase the speed is stopped, and at the same time, the indoor fan of the air conditioner is controlled to reduce the speed or stop running, for example, the indoor fan is controlled to reduce to a silent speed or stop running.

[0058] In some embodiments, after controlling the fresh air guide plate to move to a first preset position, the controller is further configured to: obtain the indoor carbon dioxide concentration value again after the time when the fresh air guide plate moves to the first preset position reaches a second preset time; and control the movement position of the fresh air guide plate and / or the speed and operating time of the fresh air fan again based on the relationship between the concentration value obtained again and the first preset concentration threshold and the second preset concentration threshold.

[0059] In an embodiment, the fresh air guide plate is controlled to keep running for a second preset time, for example, t 1 After a certain time, the indoor carbon dioxide concentration value is obtained again, and the indoor carbon dioxide concentration value detected at the last moment is judged again. As with the last control strategy, the movement position of the fresh air guide plate and / or the speed and running time of the fresh air fan are controlled again according to the relationship between the concentration value obtained again and the first preset concentration threshold and the second preset concentration threshold.

[0060] It can be understood that when the time for the fresh air guide plate to run to the first preset position reaches the second preset time, the indoor carbon dioxide concentration value is detected again, and the movement position of the fresh air guide plate and / or the speed and running time of the fresh air fan are controlled according to the detection result, so that the anti-condensation control of the air conditioner is more reliable.

[0061] In some embodiments, when controlling the movement position of the fresh air guide plate and / or the speed and running time of the fresh air fan again, the controller is configured as follows: when the concentration value exceeds the first preset concentration threshold, the fresh air guide plate is controlled to move to the first preset position, the indoor fan of the air conditioner is controlled to start, and the air guide plate of the air conditioner is controlled to move to the second preset position, until the concentration value is lower than the second preset concentration threshold, the fresh air fan is controlled to be reduced to the first preset speed; when the concentration value does not exceed the second preset concentration threshold, the speed of the fresh air fan is controlled to be reduced to the first preset speed; when the concentration value is between the first preset concentration threshold and the second preset concentration threshold, the fresh air fan is controlled to run at the second preset speed for a third preset time, the indoor fan of the air conditioner is controlled to start, and the air guide plate of the air conditioner is controlled to move to the second preset position, until the concentration value is lower than the second preset concentration threshold, the fresh air fan is controlled to be reduced to the first preset speed.

[0062] In an embodiment, if the indoor carbon dioxide concentration is still higher than the first preset concentration threshold, it is considered that the demand for fresh air is still very large, but the operation time of the fresh air guide plate has been very long. Even if the fresh air guide plate is controlled, the risk of condensation is still very large. At this time, it is necessary to link the air supply control of the air conditioner and implement mixed air control on the fresh air delivery area. For example, the indoor fan of the air conditioner is controlled to start, and the air guide plate of the air conditioner is controlled to move to the second preset position, which increases the air flow and disturbance at the fresh air outlet and reduces the risk of fresh air condensation.

[0063] At the same time, mixing air control in the fresh air supply area can quickly realize fresh air replacement, improve ventilation efficiency, and quickly distribute fresh air to the room, avoiding slow diffusion of fresh air and accumulation near the fresh air outlet, thereby quickly reducing the indoor carbon dioxide concentration.

[0064] For example, when the air supply control of the air conditioner is linked, the indoor fan of the air conditioner is controlled to start. For example, the indoor fan can be set to low speed, medium speed or high speed to quickly reduce the indoor carbon dioxide concentration in a short time, and the air guide plate of the air conditioner is controlled to move to a second preset position, for example, the horizontal air guide plate is opened to the maximum air volume position, and the longitudinal air guide plate is swung to the extreme position in the direction of the fresh air outlet.

[0065] It is understandable that the second preset position is the preset position where the air volume of the air conditioner is at the maximum, which can be obtained through a large number of experimental tests. By supplying air with a large air volume of the air conditioner and accelerating the disturbance of fresh air near the fresh air outlet, the indoor carbon dioxide concentration can be quickly reduced in a short time and the risk of fresh air condensation can be avoided. When the indoor carbon dioxide concentration drops below the second preset concentration threshold, the fresh air fan is controlled to reduce the speed, for example, the fresh air fan is controlled to run at the first preset speed until the fresh air function exit command is received.

[0066] If the indoor carbon dioxide concentration is lower than the second preset concentration threshold, it is considered that the indoor fresh air demand is very low, and the user's demand for fresh air is not high, but the user will not immediately stop the fresh air intake delivery. At this time, anti-condensation control should be given priority, and the fresh air fan should be controlled by speed reduction. For example, the speed of the fresh air fan can be controlled by reducing the speed to the first preset speed, reducing the fresh air intake supply, delaying the formation of condensation, reducing the speed to the second set value, reducing the fresh air supply, and delaying the formation of condensation, until the user controls the shutdown or the system controls the shutdown.

[0067] If the indoor carbon dioxide concentration value is between the first preset concentration threshold and the second preset concentration threshold, it is considered that there is a demand for both indoor fresh air and anti-condensation control, and the demands are equivalent. If the indoor carbon dioxide concentration value is still high, in order to ensure the user's demand for fresh air intake, choose to quickly reduce the indoor carbon dioxide concentration value. In order to quickly reduce the indoor carbon dioxide concentration value, control the fresh air fan to run at the second preset speed to increase the indoor fresh air intake.

[0068] It can be understood that when the indoor carbon dioxide concentration value is between the first preset concentration threshold and the second preset concentration threshold, the fresh air fan runs at the second preset speed for the third preset time. For example, the fresh air fan increases a certain proportion or shifts up to run for the first preset time. In a short period of time, the fresh air passes through the fresh air inlet at a high speed, increasing the airflow disturbance near the fresh air inlet, shortening the heat exchange time between the fresh air and the structural parts near the fresh air inlet, and condensation cannot be generated and attached in a very short time. The third preset time is very short, such as 1-5 minutes, for example 2 minutes, 3 minutes and 5 minutes.

[0069] At the same time, in order to ensure that condensation does not occur, it is also necessary to control the start-up of the indoor fan of the air conditioner. At this time, the speed of the indoor fan of the air conditioner should be set to the highest speed, and the air guide plate of the air conditioner is controlled to move to the second preset position. For example, the horizontal air guide plate of the air conditioner is controlled to move to the position of the maximum fresh air inlet volume, and the longitudinal air guide plate moves to the extreme position in the direction of the fresh air outlet. By controlling the air conditioner to deliver air at a large air volume and accelerating the fresh air disturbance near the fresh air outlet to ensure a large air volume of mixed air, the indoor carbon dioxide concentration can be quickly reduced in a short time, and the risk of fresh air condensation can be reduced.

[0070] During the process of controlling the fresh air fan, the indoor fan and the air guide plate of the air conditioner to perform the above operations, the carbon dioxide concentration detection module, such as the carbon dioxide concentration sensor, detects the indoor carbon dioxide concentration value in real time. If the carbon dioxide concentration value is lower than the second preset concentration threshold, the control of the fresh air fan to run at the second preset speed is stopped, that is, the control of the fresh air fan to increase the speed is stopped, and at the same time, the indoor fan of the air conditioner is controlled to reduce the speed or stop running, for example, the indoor fan is controlled to reduce to a silent speed or stop running.

[0071] Among them, the detection of the indoor carbon dioxide concentration value has a higher priority. When the fresh air fan runs at the second preset speed for the third preset time, if the indoor carbon dioxide concentration value drops below the second preset concentration threshold, the fresh air fan is controlled to slow down until the instruction to exit the fresh air anti-condensation function is received, and the air conditioner is controlled to exit the fresh air anti-condensation function.

[0072] It is understandable that when the indoor carbon dioxide concentration value is between the first preset concentration threshold and the second preset concentration threshold, the speed of the fresh air fan is increased. After the speed of the fresh air fan is increased, the fresh air flow rate near the fresh air outlet is increased. The increase in the fresh air flow rate shortens the contact time between the fresh air and the structural parts near the air outlet, and it enters the room before heat exchange. At the same time, the introduction of fresh air with a large flow rate increases the pressure of the fresh air outlet and can also accelerate the air disturbance in the indoor environment. The increase in the amount of fresh air will cause more fresh air to exchange heat with the structural parts around the air outlet, affecting the anti-condensation function of the air conditioner. Therefore, the flow and heat exchange of fresh air near the outlet need to be considered comprehensively. In a short period of time, the influence of flow factors accounts for a high proportion, and the influence of heat exchange condensation accounts for a small proportion. Therefore, increasing the wind speed in a short period of time is better for quickly reducing the indoor carbon dioxide concentration value, and condensation will not occur. The setting value of the first preset time is higher than the third preset time because the fresh air operation time is not long in the initial stage, and the fresh air speed increase time can be appropriately extended.

[0073] Combine the following Figure 5 The fresh air control method of the air conditioner according to the embodiment of the present invention is described by way of example. Figure 5 FIG. 1 is a fresh air control method for an air conditioner according to an embodiment of the present invention.

[0074] Step S11, when it is determined that the fresh air anti-condensation function of the air conditioner is turned on, the indoor carbon dioxide concentration value is obtained.

[0075] Step S12, comparing the indoor carbon dioxide concentration value with a preset concentration threshold, and jumping to step S13, step S22 or step S24.

[0076] Step S13: the concentration value exceeds a first preset concentration threshold.

[0077] Step S14, controlling the fresh air guide plate to move to a first preset position.

[0078] Step S15, after the time for the fresh air guide plate to move to the first preset position reaches the second preset time, the indoor carbon dioxide concentration value is obtained again.

[0079] Step S16: the concentration value exceeds a first preset concentration threshold.

[0080] Step S17, controlling the fresh air guide plate to move to a first preset position, controlling the indoor fan of the air conditioner to start, and controlling the air guide plate of the air conditioner to move to a second preset position.

[0081] Step S18: the concentration value does not exceed the second preset concentration threshold.

[0082] Step S19, controlling the rotation speed of the fresh air fan to decrease to a first preset rotation speed.

[0083] Step S20: the concentration value is between a first preset concentration threshold and a second preset concentration threshold.

[0084] Step S21, controlling the fresh air fan to run at a second preset speed for a third preset time, controlling the indoor fan of the air conditioner to start, and controlling the air guide plate of the air conditioner to move to a second preset position.

[0085] Step S22: the concentration value does not exceed the second preset concentration threshold.

[0086] Step S23, controlling the rotation speed of the fresh air fan to decrease to a first preset rotation speed.

[0087] Step S24: the concentration value is between a first preset concentration threshold and a second preset concentration threshold.

[0088] Step S25, controlling the fresh air fan to run at a second preset speed for a first preset time, controlling the indoor fan of the air conditioner to start, and controlling the air guide plate of the air conditioner to move to a second preset position.

[0089] like Figure 6 The figure is a schematic diagram of the corresponding relationship between relative humidity and dew point temperature of an embodiment of the present invention. The fundamental reason for the anti-condensation phenomenon is that the indoor environmental parameters and outdoor environmental parameters are asymmetric. The so-called environmental parameters mainly refer to indoor environmental temperature, outdoor environmental temperature, indoor environmental relative humidity, outdoor environmental relative humidity and dew point temperature, etc. The above parameters are coupled with each other. The coupling relationship between the parameters is as follows: Figure 6 As shown by Figure 6It can be seen that under the same curve, the same ambient temperature, when the ambient temperature is the same, the higher the relative humidity, the higher the corresponding dew point temperature. Similarly, when the relative humidity remains unchanged, the higher the ambient temperature, the higher the corresponding dew point temperature. When the ambient temperature and relative humidity are high, the corresponding dew point temperature is also high. When condensation occurs near the fresh air outlet, the dew point temperature is higher than the ambient temperature. Therefore, when cold and hot meet, water vapor condenses and adheres to the vicinity of the fresh air outlet.

[0090] In some embodiments, the air conditioner also includes: an indoor ambient temperature sensor for detecting the indoor ambient temperature; an outdoor ambient temperature sensor for detecting the outdoor ambient temperature; an indoor humidity sensor for detecting the indoor ambient relative humidity; an outdoor humidity sensor for detecting the outdoor ambient relative humidity; the controller is also configured to: before turning on the fresh air anti-condensation function, obtain the outdoor ambient temperature, ambient temperature, outdoor ambient relative humidity and indoor ambient relative humidity; determine the fresh air temperature according to the outdoor ambient temperature and the indoor ambient temperature; determine the fresh air dew point temperature or the indoor dew point temperature according to the fresh air temperature and the indoor ambient temperature; determine a first temperature difference according to the indoor dew point temperature and the fresh air temperature, or determine a second temperature difference according to the fresh air dew point temperature and the indoor ambient temperature.

[0091] In an embodiment, before the air conditioner turns on the fresh air anti-condensation function, it is necessary to obtain the outdoor ambient temperature, indoor ambient temperature, outdoor ambient relative humidity and indoor ambient relative humidity, and determine whether the air conditioner turns on the fresh air anti-condensation function based on the above parameters.

[0092] For example, the indoor ambient temperature is recorded as , the outdoor ambient temperature is recorded as , the fresh air temperature is recorded as , fresh air temperature Different from the indoor ambient temperature and the outdoor ambient temperature, the fresh air will exchange heat with the fresh air duct wall and the wall during the transportation process in the fresh air duct. Therefore, if the temperature detected by the temperature sensor is used as the fresh air temperature, the judgment may be distorted. Considering the relationship between the fresh air temperature and the indoor ambient temperature and the outdoor ambient temperature, the following coupling formula can be established:

[0093] +

[0094] in, For temperature compensation, , is a constant, The value range is [0,1]. The value range is [0,1]. It can be understood that the indoor fresh air temperature can also be obtained by setting a temperature sensor at the fresh air outlet to detect the fresh air temperature.

[0095] After determining the fresh air temperature according to the outdoor ambient temperature and the indoor ambient temperature, compare the fresh air temperature and the indoor ambient temperature. If the fresh air temperature is lower than the indoor ambient temperature, that is, < , the indoor dew point temperature is determined according to the indoor environment relative humidity and the indoor environment temperature, after the indoor dew point temperature is determined, the first temperature difference is determined according to the indoor dew point temperature and the fresh air temperature, and it is judged according to the first temperature difference whether the air conditioner meets the triggering condition of the fresh air anti-condensation function, that is, whether the first temperature difference is greater than the preset temperature difference threshold, and when the first temperature difference is greater than the preset temperature difference threshold, the fresh air anti-condensation function is turned on, at this time, it is considered that the fresh air anti-condensation risk of the air conditioner is high, and the air conditioner turns on this function;

[0096] If the fresh air temperature is greater than or equal to the indoor ambient temperature, that is, ≥ The fresh air dew point temperature is determined according to the relative humidity of the outdoor environment and the fresh air temperature. After the fresh air dew point temperature is determined, a second temperature difference is determined between the fresh air dew point temperature and the indoor environment temperature. According to the second temperature difference, it is judged whether the air conditioner meets the triggering condition of the fresh air anti-condensation function, that is, whether the second temperature difference is greater than the preset temperature difference threshold. When the second temperature difference is greater than the preset temperature difference threshold, the fresh air anti-condensation function is turned on. At this time, it is considered that the fresh air anti-condensation risk of the air conditioner is high, and the air conditioner turns on this function.

[0097] For example, when the fresh air temperature is 32℃ and the indoor ambient temperature is 20℃, Greater than , the fresh air dew point temperature is determined according to the outdoor relative humidity and the fresh air temperature. If the outdoor relative humidity is 75%, the fresh air dew point temperature is 27°C. At this time, the second temperature difference is greater than the pre-temperature difference threshold. After the fresh air is mixed with the indoor air, there is a great probability that the temperature will drop from 32°C to a dew point temperature below 27°C. It is considered that the air conditioner has a greater condensation risk.

[0098] When the fresh air temperature is 16℃ and the indoor ambient temperature is 20℃, Less than The indoor dew point temperature is determined according to the indoor relative humidity and indoor temperature. If the outdoor relative humidity is 50% and the indoor dew point temperature is 9.3°C, the first temperature difference is greater than the pre-temperature difference threshold. After the fresh air is mixed with the indoor air, there is a high probability that the indoor air near the fresh air outlet will drop below the dew point temperature. In this case, the air conditioner is considered to have a greater risk of condensation.

[0099] In some embodiments, when the difference does not meet the triggering condition of the fresh air anti-condensation function, the air conditioner is controlled to continue to operate in the initial state. It is understandable that when the difference does not meet the triggering condition of the fresh air anti-condensation function, it is considered that the condensation risk is low. At this time, the air conditioner is controlled to continue to operate in the initial state, and the difference is continuously calculated during the operation of the air conditioner until the difference meets the triggering condition of the fresh air anti-condensation function, and the fresh air anti-condensation function is controlled to be turned on.

[0100] Combine the following Figure 7 The fresh air control method of the air conditioner according to the embodiment of the present invention is described by way of example. Figure 7 As shown, it is a flow chart of starting the fresh air anti-condensation function of an air conditioner according to an embodiment of the present invention.

[0101] Step S30, obtaining the outdoor environment temperature, indoor environment temperature, outdoor environment relative humidity and indoor environment relative humidity.

[0102] Step S31, determining the fresh air temperature according to the outdoor ambient temperature and the indoor ambient temperature.

[0103] Step S32, determining the fresh air dew point temperature or the indoor dew point temperature according to the fresh air temperature and the indoor ambient temperature.

[0104] Step S33, determine whether the fresh air temperature is lower than the indoor ambient temperature, if so, execute step S34, if not, execute step S36.

[0105] Step S34, when the fresh air temperature does not exceed the indoor ambient temperature, the indoor dew point temperature is determined according to the indoor ambient relative humidity and the indoor ambient temperature.

[0106] Step S35, determining a first temperature difference according to the indoor dew point temperature and the fresh air temperature.

[0107] Step S36, when the fresh air temperature exceeds the indoor ambient temperature, the fresh air dew point temperature is determined according to the outdoor ambient relative humidity and the fresh air temperature.

[0108] Step S37, determining a second temperature difference according to the fresh air dew point temperature and the indoor ambient temperature.

[0109] Step S38: When the first temperature difference or the second temperature difference is greater than a preset temperature difference threshold, it is considered that the condensation risk of the air conditioner is high.

[0110] Step S39, the air conditioner turns on the fresh air anti-condensation function.

[0111] According to the air conditioner of the embodiment of the present invention, when determining whether to turn on the fresh air anti-condensation function of the air conditioner, the indoor carbon dioxide concentration value is used as the control target, taking into account the user's demand for fresh air intake volume and anti-condensation demand, and according to the relationship between the indoor carbon dioxide concentration value and the preset concentration threshold, the movement position of the fresh air guide plate and / or the speed and operating time of the fresh air fan are controlled, so as to reduce the risk of condensation while ensuring the fresh air intake volume, thereby improving the user experience.

[0112] The following describes the fresh air control method of the air conditioner according to the embodiment of the present invention. Figure 8 As shown, the fresh air control method of the air conditioner according to the embodiment of the present invention at least includes: step S1 and step S2.

[0113] Step S1, when the fresh air fan is started, if the first temperature difference between the indoor dew point temperature and the fresh air temperature meets the triggering condition of the fresh air anti-condensation function, or the second temperature difference between the fresh air dew point temperature and the indoor ambient temperature meets the triggering condition of the fresh air anti-condensation function, the fresh air anti-condensation function is turned on and the indoor carbon dioxide concentration value is obtained.

[0114] In an embodiment, when the fresh air blower is started, it is determined whether a first temperature difference between the indoor dew point temperature and the fresh air temperature or a second temperature difference between the fresh air dew point temperature and the indoor ambient temperature meets the triggering condition of the fresh air anti-condensation function. If so, when it is determined that the condensation risk of the air conditioner is high, the fresh air anti-condensation function is turned on. At this time, the indoor carbon dioxide concentration value is obtained. It can be understood that the indoor carbon dioxide concentration value can be the indoor carbon dioxide concentration value detected at the previous moment, or it can be the indoor carbon dioxide concentration value detected at the current moment.

[0115] Step S2, compare the concentration value with the preset concentration threshold, and control the movement position of the fresh air guide plate and / or the speed and running time of the fresh air fan according to the size relationship between the concentration value and the preset concentration threshold, until the concentration value meets the preset conditions and the fresh air fan is turned off, and control the air conditioner to exit the fresh air anti-condensation function.

[0116] In an embodiment, after the indoor carbon dioxide concentration value is detected, the relationship between the carbon dioxide concentration value and a preset concentration threshold is compared, and the preset concentration threshold includes a first preset concentration threshold and a second preset concentration threshold. According to the relationship between the carbon dioxide concentration value and different preset concentration thresholds, the operating position of the fresh air guide plate and / or the speed and operating time of the fresh air fan are adaptively controlled. When controlling the operating status of the fresh air guide plate and the fresh air fan, the indoor carbon dioxide concentration value is mainly used as the control target, and the user's demand for the fresh air intake volume is given priority, while taking into account anti-condensation control. While reducing the risk of fresh air condensation and ensuring the fresh air volume, the user experience is improved. At the same time, there is no need to use sponges or flocking cloth to stick insulation at locations where condensation is prone to occur, thereby ensuring the production rhythm.

[0117] According to the fresh air control method of the air conditioner according to an embodiment of the present invention, when the first temperature difference or the second temperature difference meets the triggering condition of the fresh air anti-condensation function, it is determined that the air conditioner turns on the fresh air anti-condensation function, and the indoor carbon dioxide concentration value is used as the control target, taking into account the user's demand for fresh air intake volume and anti-condensation demand, and according to the relationship between the indoor carbon dioxide concentration value and the preset concentration threshold, the movement position of the fresh air guide plate and / or the speed and running time of the fresh air fan are controlled, so as to reduce the risk of condensation while ensuring the fresh air intake volume, thereby improving the user experience.

[0118] In some embodiments, the movement position of the fresh air guide plate and / or the speed and operating time of the fresh air fan are controlled according to the size relationship between the concentration value and the preset concentration threshold, including: when the concentration value exceeds the first preset concentration threshold, the air supply angle of the fresh air guide plate is controlled to move to the first preset position, wherein when the air supply angle of the fresh air guide plate moves to the first preset position, the air conditioner generates minimal condensation at the fresh air outlet; when the concentration value does not exceed the second preset concentration threshold, the speed of the fresh air fan is controlled to be reduced to the first preset speed; when the concentration value is between the first preset concentration threshold and the second preset concentration threshold, the fresh air fan is controlled to run at the second preset speed for a first preset time, the indoor fan of the air conditioner is controlled to start, and the air guide plate of the air conditioner is controlled to move to the second preset position, wherein the first preset concentration threshold is higher than the second preset concentration threshold, the first preset speed is less than the second preset speed, and the second preset position is the preset position when the air volume of the air conditioner is maximum.

Claims

1. An air conditioner, characterized in that: include: The refrigerant circulation loop allows the refrigerant to circulate in a loop consisting of a compressor, a condenser, an expansion valve, an evaporator and a four-way valve; Carbon dioxide concentration detection module, used to detect the indoor carbon dioxide concentration value; Fresh air fan, used to adjust the fresh air intake volume; Fresh air guide plate, used to adjust the fresh air direction; The controller is configured to: when the fresh air fan is started, if a first temperature difference between the indoor dew point temperature and the fresh air temperature meets the triggering condition of the fresh air anti-condensation function, or a second temperature difference between the fresh air dew point temperature and the indoor ambient temperature meets the triggering condition of the fresh air anti-condensation function, start the fresh air anti-condensation function and obtain the indoor carbon dioxide concentration value; comparing the concentration value with a preset concentration threshold, and controlling the movement position of the fresh air guide plate and / or the speed and operation time of the fresh air fan according to the magnitude relationship between the concentration value and the preset concentration threshold, until the concentration value meets a preset condition and the fresh air fan is turned off, controlling the air conditioner to exit the fresh air anti-condensation function; Wherein, when controlling the movement position of the fresh air guide plate and / or the speed and operation time of the fresh air fan according to the magnitude relationship between the concentration value and the preset concentration threshold, the controller is specifically configured as follows: When the concentration value exceeds a first preset concentration threshold, controlling the air supply angle of the fresh air guide plate to move to a first preset position, wherein when the air supply angle of the fresh air guide plate moves to the first preset position, the air conditioner generates the least condensation at the fresh air outlet; When the concentration value does not exceed the second preset concentration threshold, controlling the rotation speed of the fresh air fan to decrease to the first preset rotation speed; When the concentration value is between the first preset concentration threshold and the second preset concentration threshold, the fresh air fan is controlled to run at a second preset speed for a first preset time, the indoor fan of the air conditioner is controlled to start, and the air guide plate of the air conditioner is controlled to move to a second preset position, wherein the first preset concentration threshold is higher than the second preset concentration threshold, the first preset speed is lower than the second preset speed, and the second preset position is the preset position where the air volume of the air conditioner is maximum.

2. The air conditioner according to claim 1, characterized in that: After controlling the fresh air guide plate to move to the first preset position, the controller is further configured to: After the time for the fresh air guide plate to move to the first preset position reaches a second preset time, obtaining the indoor carbon dioxide concentration value again; According to the relationship between the concentration value obtained again and the first preset concentration threshold and the second preset concentration threshold, the movement position of the fresh air guide plate and / or the speed and operating time of the fresh air fan are controlled again.

3. The air conditioner according to claim 2, characterized in that: When controlling the movement position of the fresh air guide plate and / or the speed and running time of the fresh air fan again, the controller is configured as follows: When the concentration value exceeds the first preset concentration threshold, the fresh air guide plate is controlled to move to the first preset position, the indoor fan of the air conditioner is controlled to start, and the air guide plate of the air conditioner is controlled to move to the second preset position, until the concentration value is lower than the second preset concentration threshold, the fresh air fan is controlled to reduce to the first preset speed; When the concentration value does not exceed the second preset concentration threshold, controlling the rotation speed of the fresh air fan to decrease to the first preset rotation speed; When the concentration value is between the first preset concentration threshold and the second preset concentration threshold, the fresh air fan is controlled to run at the second preset speed for a third preset time, the indoor fan of the air conditioner is controlled to start, and the air guide plate of the air conditioner is controlled to move to the second preset position. Until the concentration value is lower than the second preset concentration threshold, the fresh air fan is controlled to be reduced to the first preset speed.

4. The air conditioner according to claim 1, characterized in that: The air conditioner also includes: Indoor ambient temperature sensor, used to detect indoor ambient temperature; Outdoor ambient temperature sensor, used to detect outdoor ambient temperature; Indoor humidity sensor, used to detect the relative humidity of the indoor environment; Outdoor humidity sensor, used to detect the relative humidity of the outdoor environment; The controller is further configured to: before starting the fresh air anti-condensation function, obtain the outdoor environment temperature, the indoor environment temperature, the outdoor environment relative humidity and the indoor environment relative humidity; Determine the fresh air temperature according to the outdoor ambient temperature and the indoor ambient temperature; Determine the fresh air dew point temperature or the indoor dew point temperature according to the fresh air temperature and the indoor ambient temperature; The first temperature difference is determined according to the indoor dew point temperature and the fresh air temperature, or the second temperature difference is determined according to the fresh air dew point temperature and the indoor ambient temperature.

5. The air conditioner according to claim 4, characterized in that: When determining the fresh air dew point temperature or the indoor dew point temperature according to the fresh air temperature and the indoor ambient temperature, the controller is configured as follows: When the fresh air temperature exceeds the indoor environment temperature, determining the fresh air dew point temperature according to the outdoor environment relative humidity and the fresh air temperature; When the fresh air temperature does not exceed the indoor ambient temperature, the indoor dew point temperature is determined according to the indoor ambient relative humidity and the indoor ambient temperature.

6. The air conditioner according to claim 4, characterized in that: The controller is configured to control the air conditioner to continue operating in an initial state if the first temperature difference does not meet the triggering condition of the fresh air anti-condensation function, or if the second temperature difference does not meet the triggering condition of the fresh air anti-condensation function.

7. The air conditioner according to claim 4, characterized in that: The triggering conditions of the fresh air anti-condensation function include: The first temperature difference or the second temperature difference is greater than a preset temperature difference threshold.

8. A fresh air control method for an air conditioner, characterized in that: include: When the fresh air fan is started, if the first temperature difference between the indoor dew point temperature and the fresh air temperature meets the triggering condition of the fresh air anti-condensation function, or the second temperature difference between the fresh air dew point temperature and the indoor ambient temperature meets the triggering condition of the fresh air anti-condensation function, the fresh air anti-condensation function is turned on and the indoor carbon dioxide concentration value is obtained; comparing the concentration value with a preset concentration threshold, and controlling the movement position of the fresh air guide plate and / or the speed and running time of the fresh air fan according to the magnitude relationship between the concentration value and the preset concentration threshold, until the concentration value meets a preset condition and the fresh air fan is turned off, controlling the air conditioner to exit the fresh air anti-condensation function; According to the magnitude relationship between the concentration value and the preset concentration threshold, controlling the movement position of the fresh air guide plate and / or the speed and operation time of the fresh air fan includes: When the concentration value exceeds a first preset concentration threshold, the air supply angle of the fresh air guide plate is controlled to move to a first preset position, wherein when the air supply angle of the fresh air guide plate moves to the first preset position, the air conditioner generates the least condensation at the fresh air outlet, and the first preset position is the anti-condensation target movement position of the fresh air guide plate of the air conditioner under the anti-condensation function; When the concentration value does not exceed the second preset concentration threshold, controlling the rotation speed of the fresh air fan to decrease to the first preset rotation speed; When the concentration value is between the first preset concentration threshold and the second preset concentration threshold, the fresh air fan is controlled to run at a second preset speed for a first preset time, the indoor fan of the air conditioner is controlled to start, and the air guide plate of the air conditioner is controlled to move to a second preset position, wherein the first preset concentration threshold is higher than the second preset concentration threshold, the first preset speed is lower than the second preset speed, and the second preset position is the preset position where the air volume of the air conditioner is maximum.

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