Control method of fresh air air conditioner

Abstract

The present invention provides a control method for a fresh air air conditioner, which obtains real-time quality parameters of indoor air; when the real-time quality parameters exceed corresponding preset values, the blower is controlled to operate, and the fresh air inlet is controlled to communicate with the outdoor space, or the indoor return air inlet is controlled to communicate with the indoor space. The present invention detects the real-time quality parameters of the indoor air, and when the detected real-time quality parameters exceed corresponding preset values, the blower is controlled to operate to filter and purify the outdoor fresh air or the indoor return air using a fresh air module. No corresponding filtering and purification components are provided at the indoor air inlet, and the air intake volume at the indoor air inlet and the air output volume at the indoor air outlet are not reduced, thereby improving the performance of the air conditioner. Moreover, since the fresh air module is not in full-time operation, the service life of the filtering and purification components can be extended, thereby reducing the user's usage costs.

Description

Technical Field

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

[0002] Most households tend to keep doors and windows closed when using air conditioning, which can save electricity. However, this also has disadvantages. Over time, indoor air quality will deteriorate, oxygen will be insufficient, and carbon dioxide will continue to increase. Especially when there are many people indoors, there will be a serious lack of oxygen in the air. However, if the doors and windows are opened, the ventilation area of ​​the doors and windows is too large, and the air flow is too fast, resulting in a decrease in the cooling and heating effect of the air conditioner.

[0003] Previous air conditioners could only circulate indoor air to achieve cooling and heating effects, which could not guarantee the freshness of the indoor air. With the continuous development of the air conditioning industry, a new type of air conditioner has emerged. This air conditioner has a fresh air function, which can draw fresh air from the outside into the room, and then use the air conditioner to cool and heat it, which not only ensures the customer's comfort effect, but also improves the quality of the indoor air. The fresh air air conditioners on the market only filter the outdoor air and discharge it to the indoor side after necessary fresh air, increasing the oxygen content indoors, but cannot purify the indoor return air. To purify the indoor return air, corresponding filtering and purification components are usually installed at the return air inlet of the air conditioner (the air inlet side of the indoor heat exchanger). This will lead to a decrease in the indoor return air exhaust volume, thereby reducing the performance of the air conditioner and the user's comfort. At the same time, since the filtering and purification components are used during the use of the air conditioner, regardless of whether the indoor air reaches the level of purification required, the service life is shortened, which increases the cost for the user. Summary of the Invention

[0004] Therefore, the present invention provides a control method for a fresh air air conditioner, which can solve the technical problem in the prior art that the indoor return air filtering and purification components in the fresh air air conditioner are placed at the air inlet of the indoor heat exchanger, resulting in a reduction in the air intake and exhaust volume of the air conditioner, reducing the performance of the air conditioner and shortening the service life of the filtering and purification components.

[0005] In order to solve the above problems, the present invention provides a control method for a fresh air air conditioner, wherein the fresh air air conditioner includes a fresh air module and an indoor temperature control module, wherein the fresh air module has a fresh air inlet controllably connected to an outdoor space, an indoor return air inlet controllably connected to an indoor space, a fresh air exhaust outlet, a filtering and purification component, and a driving fan for driving an air flow to flow from the fresh air inlet or the indoor return air inlet, the filtering and purification component is located between the fresh air inlet and the fresh air exhaust outlet and between the indoor return air inlet and the fresh air exhaust outlet, the indoor temperature control module includes an indoor heat exchanger, an indoor air inlet corresponding to the air inlet side of the indoor heat exchanger, and an indoor air outlet corresponding to the air outlet side of the indoor heat exchanger; the control method includes:

[0006] Obtain real-time quality parameters of indoor air;

[0007] When the real-time quality parameter exceeds a corresponding preset value, the driving fan is controlled to operate, and the fresh air inlet is controlled to be connected to the outdoor space or the indoor return air inlet is controlled to be connected to the indoor space.

[0008] In some embodiments, the real-time quality parameter includes a carbon dioxide content N1, and the preset value corresponding to the carbon dioxide content includes a carbon dioxide content preset value N0. When the real-time quality parameter exceeds the corresponding preset value, controlling the drive fan to operate and controlling the fresh air inlet to communicate with the outdoor space or the indoor return air inlet to communicate with the indoor space includes:

[0009] When N1>N0, the driving fan is controlled to operate and the fresh air inlet is controlled to be connected to the outdoor space, and the indoor return air inlet is controlled to be disconnected from the indoor space.

[0010] In some embodiments, when the driving fan is running and the fresh air inlet is connected to the outdoor space, the method further includes:

[0011] Determine the magnitude relationship of the difference between N1 and N0;

[0012] The rotation speed of the driving fan is controlled and adjusted according to the size relationship, and the rotation speed of the driving fan is positively correlated with the size relationship.

[0013] In some embodiments,

[0014] Controlling and adjusting the speed of the driving fan according to the magnitude relationship, wherein the speed of the driving fan is positively correlated with the magnitude relationship, specifically includes:

[0015] When N1-N0>ΔNy1, the driving fan is controlled to run at the first speed V1; or,

[0016] When ΔNy1≥N1-N0>ΔNy2, the driving fan is controlled to operate at the second speed V2; or,

[0017] When ΔNy2≥N1-N0, the driving fan is controlled to run at the third speed V3,

[0018] The ΔNy1 is a first carbon dioxide content setting value, and the ΔNy2 is a second carbon dioxide content setting value.

[0019] In some embodiments,

[0020] The greater the difference between N1 and N0, the longer the operating time of the driving fan.

[0021] In some embodiments, the real-time quality parameter further includes a polluted particulate matter content value K1, and the preset value corresponding to the polluted particulate matter content value includes a particulate matter content preset value K0. When N1 ≤ N0, the control method further includes:

[0022] Further obtaining the K1;

[0023] When K1>K0, the driving fan is controlled to run and the fresh air inlet is controlled to be disconnected from the outdoor space, and the indoor return air inlet is controlled to be connected to the indoor space; or, when K1≤K0, the driving fan is controlled to stop running and the fresh air inlet is controlled to be disconnected from the outdoor space, and the indoor return air inlet is controlled to be disconnected from the indoor space.

[0024] In some embodiments, the real-time quality parameter further includes a formaldehyde concentration J1, and the preset value corresponding to the formaldehyde concentration includes a formaldehyde concentration preset value J0. When N1≤N0, the control method further includes:

[0025] Further obtaining the J1;

[0026] When J1>J0, the driving fan is controlled to run and the fresh air inlet is controlled to be disconnected from the outdoor space, and the indoor return air inlet is controlled to be connected to the indoor space; or, when J1≤J0, the driving fan is controlled to stop running and the fresh air inlet is controlled to be disconnected from the outdoor space, and the indoor return air inlet is controlled to be disconnected from the indoor space.

[0027] In some embodiments, when J1>J0 or K1>K0, the driving fan is controlled to operate for a duration greater than the duration of the driving fan operation when N1>N0, and the operating speed of the driving fan is controlled to be less than the operating speed of the driving fan when N1>N0.

[0028] In some embodiments, the fresh air module also includes a baffle and a rotating drive component that drives the baffle to rotate. The rotating drive component can drive the baffle to switch between a first position and a second position. When the baffle is in the first position, the fresh air inlet is cut off from the outdoor space and the indoor return air inlet is connected to the indoor space. When the baffle is in the second position, the fresh air inlet is connected to the outdoor space and the indoor return air inlet is cut off from the indoor space.

[0029] In some embodiments, the fresh air air conditioner includes a wall-mounted indoor unit body. Taking the installation orientation of the indoor unit body as a reference, the indoor air inlet and the fresh air exhaust outlet are both located at the top of the indoor unit body and the indoor air inlet and the fresh air exhaust outlet are arranged adjacent to each other.

[0030] In some embodiments, the fresh air module and the indoor temperature control module are arranged horizontally left and right, the driving fan is a centrifugal fan, and the rotating shaft of the centrifugal fan is horizontally set, the filtering and purification component is located at the air intake on the side of the centrifugal fan away from the indoor temperature control module, and the filtering and purification component is set at an angle.

[0031] The present invention provides a control method for a fresh air air conditioner, which detects the real-time quality parameters of indoor air and controls the driving fan to operate when the detected real-time quality parameters exceed the corresponding preset values ​​so as to utilize the fresh air module to filter and purify the outdoor fresh air or the indoor return air. No corresponding filtering and purification components are provided at the indoor air inlet, and the air intake volume at the indoor air inlet and the air outlet volume at the indoor air outlet are not reduced, thereby improving the performance of the air conditioner. Moreover, since the fresh air module is not in full-time operation, the service life of the filtering and purification components can be extended, thereby reducing the user's usage cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of the external structure of the fresh air air conditioner in an embodiment of the present invention;

[0033] Figure 2 for Figure 1 The structural diagram of the fresh air air conditioner in the figure omits the external panel components;

[0034] Figure 3 for Figure 1 Schematic diagram of the internal structure of the fresh air module in the fresh air air conditioner in the indoor circulation mode, where the arrows in the figure indicate the direction of indoor return air flow;

[0035] Figure 4 for Figure 1 Schematic diagram of the internal structure of the fresh air module in the fresh air air conditioner in the fresh air mode, where the arrows in the figure indicate the direction of fresh air flow;

[0036] Figure 5 This is a logic control flow chart of a control method for a fresh air air conditioner in an embodiment of the present invention.

[0037] The reference numerals indicate:

[0038] 11. Fresh air inlet; 111. Fresh air duct; 12. Indoor return air inlet; 13. Fresh air exhaust outlet; 14. Filtering and purification components; 15. Driving fan; 16. Baffle; 17. Rotating drive component; 21. Indoor heat exchanger; 22. Indoor air inlet; 23. Indoor air outlet; 100. Indoor unit body. DETAILED DESCRIPTION

[0039] See also Figures 1 to 5 As shown, according to an embodiment of the present invention, a control method for a fresh air air conditioner is provided, the fresh air air conditioner includes a fresh air module and an indoor temperature control module, wherein the fresh air module has a fresh air inlet 11 that is controllably connected to an outdoor space (through a fresh air duct 111), an indoor return air inlet 12 that is controllably connected to an indoor space, a fresh air exhaust outlet 13, a filtering and purification component 14, and a driving fan 15 for driving an air flow from the fresh air inlet 11 or the indoor return air inlet 12 to flow in, the filtering and purification component 14 is located between the fresh air inlet 11 and the fresh air exhaust outlet 13 and between the indoor return air inlet 12 and the fresh air exhaust outlet 13, the indoor temperature control module includes an indoor heat exchanger 21, an indoor air inlet 22 corresponding to the air inlet side of the indoor heat exchanger 21, and an indoor air outlet 23 corresponding to the air outlet side of the indoor heat exchanger 21; the control method includes:

[0040] Obtain real-time quality parameters of indoor air;

[0041] When the real-time quality parameter exceeds the corresponding preset value, the fan 15 is controlled to operate, and the fresh air inlet 11 is controlled to communicate with the outdoor space or the indoor return air inlet 12 is controlled to communicate with the indoor space.

[0042] In this technical solution, the real-time quality parameters of the indoor air are detected, and when the detected real-time quality parameters exceed the corresponding preset values, the fan 15 is controlled to operate so as to utilize the fresh air module to filter and purify the outdoor fresh air or the indoor return air. No corresponding filtering and purification components are provided at the indoor air inlet 22, and the air intake volume at the indoor air inlet 22 and the air outlet volume at the indoor air outlet 23 are not reduced, thereby improving the performance of the air conditioner. Moreover, since the fresh air module is not in full-time operation, the service life of the filtering and purification component 14 can be extended, thereby reducing the user's usage cost.

[0043] In some embodiments, the real-time quality parameter includes a carbon dioxide content N1, and the preset value corresponding to the carbon dioxide content includes a carbon dioxide content preset value N0. When the real-time quality parameter exceeds the corresponding preset value, controlling the driving fan 15 to operate and controlling the fresh air inlet 11 to be connected to the outdoor space or the indoor return air inlet 12 to be connected to the indoor space includes: when N1>N0, controlling the driving fan 15 to operate (i.e., rotate) and controlling the fresh air inlet 11 to be connected to the outdoor space, and controlling the indoor return air inlet 12 to be disconnected from the indoor space. In this technical solution, the detected carbon dioxide content N1 is higher than N0, indicating that the indoor oxygen content is low and fresh air needs to be introduced. The driving fan 15 is controlled to operate to introduce the fresh air from the outdoor side into the fresh air module, and after being filtered and purified by the filtering and purification component 14, it is discharged to the indoor space through the fresh air exhaust port 13, thereby increasing the oxygen content in the indoor space and thus meeting the comfort needs of indoor users.

[0044] In a preferred embodiment, when the fan 15 is driven to operate and the fresh air inlet 11 is connected to the outdoor space, Figure 5 As shown, it also includes: judging the size relationship of the difference between N1 and N0; controlling and adjusting the speed of the driving fan 15 according to the size relationship, and the speed of the driving fan 15 is positively correlated with the size relationship. Specifically, when N1-N0>△Ny1, the driving fan 15 is controlled to run at the first speed V1; or, when △Ny1≥N1-N0>△Ny2, the driving fan 15 is controlled to run at the second speed V2; or, when △Ny2≥N1-N0, the driving fan 15 is controlled to run at the third speed V3, △Ny1 is the first carbon dioxide content setting value, and △Ny2 is the second carbon dioxide content setting value. In this technical solution, the speed of the driving fan 15 is adjusted according to the difference between the indoor carbon dioxide content and the preset value N0. The larger the difference, the greater the speed. This can ensure that the required content of the indoor space is increased more quickly, thereby improving the user's comfort. In a further preferred embodiment, the larger the difference between N1 and N0, the longer the running time of the driving fan 15. Figure 5 As shown in , when the speed is V1, the running time is T1, when the speed is V2, the running time is T2, when the speed is V3, the running time is T3, and T1>T2>T3, so that the purpose of efficiently introducing fresh air can be achieved.

[0045] In some embodiments, the real-time quality parameter also includes a polluted particulate matter content value K1. The aforementioned polluted particulate matter, such as PM2.5 particles, etc., and the preset value corresponding to the polluted particulate matter content value includes a particulate matter content preset value K0. When N1≤N0, the control method also includes: further obtaining K1; when K1>K0, controlling the driving fan 15 to run and controlling the fresh air inlet 11 to be disconnected from the outdoor space, and controlling the indoor return air inlet 12 to be connected to the indoor space; or, when K1≤K0, controlling the driving fan 15 to stop running and controlling the fresh air inlet 11 to be disconnected from the outdoor space, and controlling the indoor return air inlet 12 to be disconnected from the indoor space. It should be noted that the step of detecting the content of polluted particles is after the carbon dioxide content reaches the set value, that is, it is prioritized to ensure that the oxygen content in the indoor space is sufficient. It is clear that during the fresh air introduction process, the fresh air air conditioner also has a corresponding exhaust structure, which can discharge the dirty air in the room. The introduction of fresh air and the discharge of indoor air at the same time will reduce the content of polluted particles in the room to a certain extent, thereby improving the air quality of the indoor space. In this way, detecting and controlling other air quality parameters (such as polluted particles) before the carbon dioxide reaches the standard will constitute improper use of the filter purification component and shorten the service life of the filter purification component. However, this technical solution designs the step of detecting the content of polluted particles and the subsequent step of detecting the formaldehyde concentration to be performed after the carbon dioxide content reaches the standard, which can obviously extend the service life of the filter purification component. When K1>K0, controlling the indoor return air inlet 12 to be connected to the indoor space can effectively purify the indoor return air through the filter purification component, thereby improving the indoor air quality.

[0046] The real-time quality parameter also includes formaldehyde concentration J1, and the preset value corresponding to the formaldehyde concentration includes a formaldehyde concentration preset value J0. When N1 ≤ N0, the control method further includes: further obtaining J1; when J1> J0, controlling the driving fan 15 to operate and control the fresh air inlet 11 to be disconnected from the outdoor space, and controlling the indoor return air inlet 12 to be connected to the indoor space; or, when J1 ≤ J0, controlling the driving fan 15 to stop operating and control the fresh air inlet 11 to be disconnected from the outdoor space, and control the indoor return air inlet 12 to be disconnected from the indoor space. The technical solution designs the formaldehyde concentration detection step to be performed after the carbon dioxide content reaches the standard, which can obviously extend the service life of the filtration and purification components. When J1> J0, controlling the indoor return air inlet 12 to be connected to the indoor space can effectively purify the indoor return air through the filtration and purification components, thereby improving indoor air quality.

[0047] In some embodiments, when J1>J0 or K1>K0, the duration of the operation of the driving fan 15 is controlled to be greater than the duration of the operation of the driving fan 15 when N1>N0, and the operating speed of the driving fan 15 is controlled to be less than the operating speed of the driving fan 15 when N1>N0, that is, in the process of filtering and purifying the indoor return air, the driving fan 15 is operated at a lower and longer speed, which can improve the purification quality of the indoor return air by the filtering and purification component and prevent excessive speed from causing poor purification effect and insufficient energy consumption. It can be understood that when the aforementioned indoor air quality parameters all meet the standards, the fresh air air conditioner operates in a normal temperature control mode (such as cooling mode or heating mode). At this time, the indoor return air enters the indoor heat exchanger 21 through the indoor air inlet 22 for heat exchange and temperature control, and then flows out from the indoor air outlet 23.

[0048] See also Figure 3 and Figure 4 As shown, the fresh air module also includes a baffle 16 and a rotating drive component 17 (which can be a rotating motor) that drives the baffle 16 to rotate. The rotating drive component 17 can drive the baffle 16 to switch between a first position and a second position. When the baffle 16 is in the first position, the fresh air inlet 11 is disconnected from the outdoor space, and the indoor return air inlet 1 is connected to the indoor space. When the baffle 16 is in the second position, the fresh air inlet 11 is connected to the outdoor space, and the indoor return air inlet 1 is disconnected from the indoor space. In this technical solution, unlike the traditional structure in which a baffle (or air valve) is set corresponding to each of the two air outlets, a baffle 16 is used to control the connection of one of the two air outlets and the disconnection of the other by switching the position of the baffle 16. This simplifies the structural design of the fresh air module while also simplifying the control logic of the air conditioner, reducing the design cost of the air conditioner.

[0049] See also Figure 1 As shown, the fresh air air conditioner includes a wall-mounted indoor unit body 100, that is, the indoor unit body 100 is a wall-mounted indoor unit. The installation orientation of the indoor unit body 100 is used as a reference ( Figure 1 The indoor air inlet 22 and the fresh air outlet 13 are both located at the top of the indoor unit body 100 and are arranged adjacent to each other. Figure 1As shown, the indoor air inlet 22 and the fresh air outlet 13 are arranged adjacent to each other along the length of the indoor unit body 100. In this way, the fresh air introduced by the fresh air module and discharged into the indoor space can be sucked in from the indoor air inlet 22 by the fan of the indoor temperature control module, so that the introduced fresh air can be blown to the user after heat exchange and temperature control by the indoor heat exchanger 21, further improving the user's comfort and effectively preventing the disturbance of the indoor temperature caused by the excessively high or low temperature of the introduced fresh air. At the same time, it should be noted that in this technical solution, the fresh air outlet 13 is located at the top and outside of the indoor unit body 100. In this way, there is no need to construct a corresponding flow channel inside the indoor unit body 100 to introduce the fresh air to the air inlet side of the indoor heat exchanger 21, thereby simplifying the internal structural design of the indoor unit body 100 and reducing the structural dimensions of the indoor unit body 100, making the structure of the indoor unit body 100 more compact.

[0050] like Figure 1 As shown, the fresh air module and the indoor temperature control module are arranged horizontally, and the driving fan 15 is a centrifugal fan (i.e. Figure 5 The centrifugal fan blades are arranged horizontally, and the rotating shaft of the centrifugal fan is arranged horizontally. The filter and purification component 14 is located at the air inlet on the side of the centrifugal fan away from the indoor temperature control module, and the filter and purification component 14 is arranged at an angle. The inclined filter and purification component 14 can reduce the overall vertical height of the indoor unit body, and the use of a centrifugal fan as the driving fan 15 can utilize the turning characteristics of the centrifugal fan for the air intake and exhaust air flow paths, so that the fresh air or indoor return air enters in the horizontal direction and flows out in the vertical direction, making the structure of the fresh air air conditioner more compact. In order to facilitate the replacement of the filter and purification component 14, it is preferred that the filter and purification component 14 is pluggable in the fresh air module. Specifically, the fresh air module has an insertion channel facing the fresh air air conditioner panel (not indicated in the figure) and facing the user side, and the filter and purification component 14 is slidably connected in the insertion channel.

[0051] The following combination Figure 5 The control method of the present invention is further described:

[0052] 1. After the user chooses to turn on the fresh air automatic control mode, the air conditioner detection module starts to detect the indoor air quality, carbon dioxide content N1, PM2.5 content K1, formaldehyde concentration J1, and compares the detected values ​​with the preset values ​​of carbon dioxide content N0, PM2.5 content K0, and formaldehyde concentration J0.

[0053] 2. When the carbon dioxide content N1>N0, after the outdoor fresh air mode is turned on, the baffle rotates to the second position, opening the outdoor side channel, and is divided into three operating states according to the size of the N1-N0 difference.

[0054] ① When N1 - N0 > ΔN0, at this time, the proportion of carbon dioxide concentration in the indoor air is relatively large, and fresh air needs to be quickly inhaled to improve the indoor air quality. Therefore, the centrifugal fan blade speed of the fresh air ventilation component is V1, and after running for T1 time, the detection module detects the indoor air quality again: the carbon dioxide content N1, and compares it with N0 again.

[0055] ② When ΔN0 > N1 - N0 > ΔN1, the centrifugal fan blade speed of the fresh air ventilation component is V2, and after running for T2 time, the detection module detects the indoor air quality again: the carbon dioxide content N1, and compares it with N0 again.

[0056] ③ When N1 - N0 < ΔN1, at this time, the proportion of carbon dioxide concentration in the indoor air is relatively small, but a certain amount of fresh air still needs to be inhaled to improve the indoor air quality. Therefore, the centrifugal fan blade speed of the fresh air ventilation component is V3, and after running for T3 time, the detection module detects the indoor air quality again: the carbon dioxide content N1, and compares it with N0 again.

[0057] 3. When the carbon dioxide content N1 < N0, continue to judge the PM2.5 content K1 and formaldehyde concentration J1 in the indoor air and compare them with the preset values of PM2.5 content K0 and formaldehyde concentration J0. When the PM2.5 content K1 > K0 or the formaldehyde concentration J1 > J0, at this time, the indoor filtration mode needs to be started, the baffle rotates to the first position, the fresh air ventilation component starts, the centrifugal fan blade speed is V0, the indoor air is inhaled into the fresh air ventilation component and discharged into the room through the health filter screen from the air outlet. After running for T4 time, the detection module detects the indoor air quality again: the carbon dioxide content N1, the PM2.5 content K1, and the formaldehyde concentration J1, and compares them with N0, K0, and J0 again.

[0058] 4. When the carbon dioxide content N1 < N0, the PM2.5 content K1 < K0, and the formaldehyde concentration J1 < J0 are all satisfied at the same time, the fresh air ventilation component does not start working, and after the standby time T5, the air conditioner detection module detects the indoor air quality again.

[0059] As described above, the outdoor fresh air mode is divided into three operating states according to the difference between the measured value and the preset value, which can save power and extend the service life of the health filter screen; the priority consideration factor of the control method is the carbon dioxide content in the indoor air. When the detection module detects N1 > N0 during the operation of the indoor filtration mode for T4 time, it will switch to the outdoor fresh air mode to ensure the oxygen content in the indoor air first; the carbon dioxide content N1, the PM2.5 content K1, and the formaldehyde concentration J1 are real-time detection values, and the carbon dioxide content N0, the PM2.5 content K0, and the formaldehyde concentration J0 are preset values; the centrifugal fan blade speed V1 > V2 > V3 > V0, the operation time of the fresh air air conditioner T4 > T1 > T2 > T3, and T5 = 30 minutes.

[0060] It is easy for those skilled in the art to understand that, under the premise of no conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0061] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention. The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art may make various improvements and variations without departing from the technical principles of the present invention, and such improvements and variations shall also be considered within the scope of protection of the present invention.

Claims

1. A control method for a fresh air air conditioner, characterized in that: The fresh air air conditioner comprises a fresh air module and an indoor temperature control module, wherein the fresh air module comprises a fresh air inlet (11) controllably connected to an outdoor space, an indoor return air inlet (12) controllably connected to an indoor space, a fresh air exhaust outlet (13), a filtering and purifying component (14), and a driving fan (15) for driving an air flow to flow from the fresh air inlet (11) or the indoor return air inlet (12), wherein the filtering and purifying component (14) is located between the fresh air inlet (11) and the fresh air exhaust outlet (13) and between the indoor return air inlet (12) and the fresh air exhaust outlet (13), and the indoor temperature control module comprises an indoor heat exchanger (21), an indoor air inlet (22) corresponding to the air inlet side of the indoor heat exchanger (21), and an indoor air outlet (23) corresponding to the air outlet side of the indoor heat exchanger (21); and the control method comprises: Obtain real-time quality parameters of indoor air; When the real-time quality parameter exceeds a corresponding preset value, the driving fan (15) is controlled to operate, and the fresh air inlet (11) is controlled to communicate with the outdoor space or the indoor return air inlet (12) is controlled to communicate with the indoor space; The real-time quality parameter includes a carbon dioxide content N1, and a preset value corresponding to the carbon dioxide content includes a carbon dioxide content preset value N0. When N1>N0, the driving fan (15) is controlled to operate and the fresh air inlet (11) is controlled to be connected to the outdoor space, and the indoor return air inlet (12) is controlled to be disconnected from the indoor space. The real-time quality parameter also includes a polluted particulate matter content value K1, and the preset value corresponding to the polluted particulate matter content value includes a particulate matter content preset value K0. When N1≤N0, the control method further includes: further obtaining the K1; when K1>K0, controlling the driving fan (15) to operate and controlling the fresh air inlet (11) to be disconnected from the outdoor space, and controlling the indoor return air inlet (12) to be connected to the indoor space; or, when K1≤K0, controlling the driving fan (15) to stop operating and controlling the fresh air inlet (11) to be disconnected from the outdoor space, and controlling the indoor return air inlet (12) to be connected to the indoor space. or, the real-time quality parameter further includes a formaldehyde concentration J1, and the preset value corresponding to the formaldehyde concentration includes a formaldehyde concentration preset value J0, and when N1≤N0, the control method further includes: further acquiring the J1; when J1>J0, controlling the driving fan (15) to operate and controlling the fresh air inlet (11) to be disconnected from the outdoor space, and controlling the indoor return air inlet (12) to be connected to the indoor space, or, when J1≤J0, controlling the driving fan (15) to stop operating and controlling the fresh air inlet (11) to be disconnected from the outdoor space, and controlling the indoor return air inlet (12) to be disconnected from the indoor space; When J1>J0 or K1>K0, the driving fan (15) is controlled to operate for a duration greater than the duration of the driving fan (15) when N1>N0, and the operating speed of the driving fan (15) is controlled to be less than the operating speed of the driving fan (15) when N1>N0.

2. The control method according to claim 1, characterized in that: When the driving fan (15) is running and the fresh air inlet (11) is connected to the outdoor space, the system further comprises: Determine the magnitude relationship of the difference between N1 and N0; The rotation speed of the driving fan (15) is controlled and adjusted according to the size relationship, and the rotation speed of the driving fan (15) is positively correlated with the size relationship.

3. The control method according to claim 2, characterized in that: Controlling and adjusting the rotational speed of the driving fan (15) according to the magnitude relationship, wherein the rotational speed of the driving fan (15) is positively correlated with the magnitude relationship, specifically includes: When N1-N0>ΔNy1, the driving fan (15) is controlled to operate at a first speed V1; or, When ΔNy1≥N1-N0>ΔNy2, the driving fan (15) is controlled to operate at a second speed V2; or, When ΔNy2≥N1-N0, the driving fan (15) is controlled to operate at a third speed V3, The ΔNy1 is a first carbon dioxide content setting value, and the ΔNy2 is a second carbon dioxide content setting value.

4. The control method according to claim 3, characterized in that: The greater the difference between N1 and N0, the longer the operating time of the driving fan (15) is.

5. The control method according to claim 1, characterized in that: The fresh air module further comprises a baffle (16) and a rotation driving component (17) for driving the baffle (16) to rotate, wherein the rotation driving component (17) is capable of driving the baffle (16) to switch between a first position and a second position. When the baffle (16) is in the first position, the fresh air inlet (11) is disconnected from the outdoor space and the indoor return air inlet is connected to the indoor space. When the baffle (16) is in the second position, the fresh air inlet (11) is connected to the outdoor space and the indoor return air inlet is disconnected from the indoor space.

6. The control method according to claim 1, characterized in that: The fresh air air conditioner comprises a wall-mounted indoor unit body (100). With reference to the installation orientation of the indoor unit body (100), the indoor air inlet (22) and the fresh air outlet (13) are both located at the top of the indoor unit body (100), and the indoor air inlet (22) and the fresh air outlet (13) are arranged adjacent to each other.

7. The control method according to claim 6, characterized in that: The fresh air module and the indoor temperature control module are arranged horizontally on the left and right sides, the driving fan (15) is a centrifugal fan, and the rotating shaft of the centrifugal fan is arranged horizontally, the filtering and purification component (14) is located at the air intake on the side of the centrifugal fan away from the indoor temperature control module, and the filtering and purification component (14) is arranged to be inclined.

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