Indoor micro positive and negative pressure control method, controller, air conditioning system and medium

Abstract

The invention discloses an indoor micro positive and negative pressure control method, a controller, an air conditioning system and a medium, and the method comprises the steps of obtaining indoor and outdoor pressure difference and an outdoor air quality index, and determining the number of indoor pollution scenes; according to the number of the indoor pollution scenes and the outdoor air quality index, micro-positive pressure control, micro-negative pressure control or zero pressure difference control is conducted on the indoor space; under micro-positive pressure control, target positive pressure is determined according to the outdoor air quality index, and the rotating speed of a motor of an exhaust fan is adjusted according to the target positive pressure and the indoor and outdoor pressure difference; under micro-negative pressure control, target negative pressure is determined according to the number of indoor pollution scenes, and the rotating speed of a motor of an exhaust fan is adjusted according to the target negative pressure and the indoor and outdoor pressure difference; and under zero pressure difference control, the rotating speed of a motor of the exhaust fan is adjusted according to the indoor and outdoor pressure difference. The indoor positive pressure and the indoor negative pressure are intelligently controlled according to indoor and outdoor influence factors so as to meet diversified use scenes and user requirements, and the method can be widely applied to the technical field of air conditioners.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and in particular to a method, controller, air conditioning system and medium for controlling indoor micro-positive and negative pressure. Background Technology

[0002] In existing applications of heat recovery-type fresh air systems, there are many problems affecting the indoor environment and equipment operation. Existing heat recovery-type fresh air systems cannot flexibly control the indoor pressure to be negative or positive based on actual indoor and outdoor factors, making it difficult to meet diverse usage scenarios and user needs. Summary of the Invention

[0003] The main objective of this application is to propose a method, controller, air conditioning system, and medium for controlling indoor micro-positive and negative pressure, which can intelligently control indoor positive and negative pressure based on indoor and outdoor influencing factors to meet diverse usage scenarios and user needs.

[0004] To achieve the above objectives, one aspect of this application proposes a method for controlling indoor micro-positive and negative pressure, applied to an air conditioning system, wherein the air conditioning system includes an exhaust fan, and the method includes the following steps:

[0005] Obtain the indoor-outdoor pressure difference and outdoor air quality index, and determine the number of indoor pollution scenarios; Based on the number of indoor pollution scenarios and the outdoor air quality index, the indoor environment is controlled by micro-positive pressure, micro-negative pressure, or zero pressure difference. Under the micro-positive pressure control, the target positive pressure is determined according to the outdoor air quality index, and then the motor speed of the exhaust fan is adjusted according to the target positive pressure and the indoor-outdoor pressure difference; Under the micro-negative pressure control, the target negative pressure is determined according to the number of indoor pollution scenarios, and then the motor speed of the exhaust fan is adjusted according to the target negative pressure and the indoor-outdoor pressure difference; Under the zero differential pressure control, the motor speed of the exhaust fan is adjusted according to the indoor and outdoor pressure difference.

[0006] In some embodiments, the air conditioning system further includes an indoor unit and an outdoor unit, and the step of acquiring the indoor-outdoor pressure difference and the outdoor air quality index, and determining the number of indoor pollution scenarios, includes: Obtain the outdoor air quality index; The indoor air pressure at the location of the indoor unit and the outdoor air pressure at the location of the outdoor unit are collected. The indoor pressure is obtained based on the indoor air pressure, and the outdoor air pressure is determined as the outdoor pressure. The indoor-outdoor pressure difference is obtained by subtracting the indoor-side pressure from the outdoor-side pressure. Monitor the situation of people indoors and determine the indoor pollution scenario based on the situation of people indoors; The number of indoor pollution scenarios is obtained by statistically analyzing the aforementioned indoor pollution scenarios.

[0007] In some embodiments, obtaining the indoor side pressure based on the indoor air pressure includes: If a wired controller is installed indoors, the pressure of the wired controller at its location is collected, and then the average value of the wired controller pressure and the indoor air pressure is calculated to obtain the first indoor pressure, which is then determined as the indoor side pressure. If a personal air sensor is installed indoors, the sensor pressure at the location of the personal air sensor is collected, and then the average value of the sensor pressure and the indoor air pressure is calculated to obtain the second indoor pressure, which is then determined as the indoor side pressure. If a wired controller and a personal air sensor are installed indoors, the pressure of the wired controller at the location of the wired controller and the pressure of the personal air sensor at the location of the personal air sensor are collected. Then, the average value of the wired controller pressure, the sensor pressure and the indoor air pressure is calculated to obtain a third indoor pressure, and the third indoor pressure is determined as the indoor side pressure. If no wired controller and air sensor are installed indoors, the indoor air pressure is determined to be the indoor side pressure.

[0008] In some embodiments, the step of controlling the indoor environment with micro-positive pressure, micro-negative pressure, or zero pressure difference based on the number of indoor pollution scenarios and the outdoor air quality index includes: When the outdoor air quality index is greater than or equal to the preset air quality threshold, the indoor air quality is controlled with a slight positive pressure. When the outdoor air quality index is less than the preset air quality threshold, determine the value corresponding to the number of indoor pollution scenarios. If the number of indoor and outdoor pollution scenarios is greater than zero, the indoor area is controlled by a slight negative pressure; if the number of indoor pollution scenarios is equal to zero, the indoor area is controlled by zero differential pressure.

[0009] In some embodiments, determining the target positive pressure based on the outdoor air quality index, and then adjusting the motor speed of the exhaust fan based on the target positive pressure and the indoor-outdoor pressure difference, includes: The weather coefficient is calculated based on the outdoor air quality index. The target positive pressure is calculated based on the default positive pressure value and the weather coefficient. When the indoor-outdoor pressure difference is greater than the target positive pressure, a first target speed is calculated based on the current speed of the exhaust fan, the target positive pressure, and the indoor-outdoor pressure difference, and then the motor speed is increased to the first target speed. When the indoor-outdoor pressure difference is less than the target positive pressure, a second target speed is calculated based on the current speed of the exhaust fan, the target positive pressure, and the indoor-outdoor pressure difference, and then the motor speed is reduced to the second target speed.

[0010] In some embodiments, determining the target negative pressure based on the number of indoor pollution scenarios, and then adjusting the motor speed of the exhaust fan based on the target negative pressure and the indoor-outdoor pressure difference, includes: Determine the pressure correction unit value; The target negative pressure is calculated based on the default negative pressure value, the number of indoor pollution scenarios, and the pressure correction unit value. When the indoor-outdoor pressure difference is greater than the negative value of the target negative pressure, a third target speed is calculated based on the current speed of the exhaust fan, the target negative pressure, and the indoor-outdoor pressure difference, and then the motor speed is increased to the third target speed. When the indoor-outdoor pressure difference is less than the negative value of the target negative pressure, a fourth target speed is calculated based on the current speed of the exhaust fan, the target negative pressure, and the indoor-outdoor pressure difference, and then the motor speed is reduced to the fourth target speed.

[0011] In some embodiments, adjusting the motor speed of the exhaust fan according to the indoor-outdoor pressure difference includes: When the indoor-outdoor pressure difference is less than zero, the fifth target speed is calculated based on the current speed of the exhaust fan, the indoor-outdoor pressure difference, and the outdoor pressure, and then the motor speed is reduced to the fifth target speed. When the indoor-outdoor pressure difference is greater than zero, the sixth target speed is calculated based on the current speed of the exhaust fan, the indoor-outdoor pressure difference, and the indoor pressure, and then the motor speed is increased to the sixth target speed.

[0012] To achieve the above objectives, another aspect of this application provides a controller, comprising: At least one processor; At least one memory for storing at least one program; When the at least one program is executed by the at least one processor, the at least one processor performs the method described above.

[0013] To achieve the above objectives, another aspect of the embodiments of this application proposes an air conditioning system, including the controller as described above.

[0014] To achieve the above objectives, another aspect of the embodiments of this application proposes a computer-readable storage medium storing computer-executable instructions for performing the methods described above.

[0015] The embodiments of this application include at least the following beneficial effects: The method, controller, air conditioning system, and medium for controlling indoor micro-positive and negative pressure, as described in this application, are applied to an air conditioning system. The air conditioning system includes an exhaust fan. First, the indoor-outdoor pressure difference and outdoor air quality index are obtained, and the number of indoor pollution scenarios is determined. Then, based on the number of indoor pollution scenarios and the outdoor air quality index, micro-positive pressure control, micro-negative pressure control, or zero-pressure-difference control is performed indoors. Specifically, under micro-positive pressure control, a target positive pressure is determined based on the outdoor air quality index, and the motor speed of the exhaust fan is adjusted based on the target positive pressure and the indoor-outdoor pressure difference. Under micro-negative pressure control, a target negative pressure is determined based on the number of indoor pollution scenarios, and the motor speed of the exhaust fan is adjusted based on the target negative pressure and the indoor-outdoor pressure difference. Under zero-pressure-difference control, the motor speed of the exhaust fan is adjusted based on the indoor-outdoor pressure difference. Based on the number of indoor pollution scenarios and the outdoor air quality index, this application flexibly selects indoor pressure control methods, which can eliminate indoor air problems caused by indoor and outdoor influencing factors and meet diverse usage scenarios and user needs. Furthermore, based on the target positive pressure, target negative pressure, and indoor-outdoor pressure difference, exhaust is achieved by adjusting the speed of the exhaust fan, which can accurately control indoor pressure and ensure the health of residents. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments of this application are described below. It should be understood that the drawings described below are only for the purpose of clearly illustrating some embodiments of the technical solutions in this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of an air conditioning system provided in one embodiment of this application; Figure 2 A flowchart illustrating the steps of an indoor micro-positive and negative pressure control method provided in one embodiment of this application; Figure 3 A schematic diagram showing the positions of an indoor wired controller and a personal air sensor according to one embodiment of this application; Figure 4 This is a flowchart illustrating an embodiment of the indoor micro-positive and negative pressure control method provided in this application. Figure 5 This is a schematic diagram of the controller provided in one embodiment of this application. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit it. In the following description, when referring to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with those of this application; they are merely examples of apparatuses and methods consistent with some aspects of the embodiments of this application as detailed in the appended claims.

[0019] It is understood that the terms “first,” “second,” etc., used in this application may be used herein to describe various concepts, but unless otherwise stated, these concepts are not limited by these terms. These terms are only used to distinguish one concept from another. For example, without departing from the scope of the embodiments of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the words “if,” “when,” or “in response to a determination” as used herein may be interpreted as “when…” or “when…” or “in response to a determination.”

[0020] As used in this application, the terms "at least one", "multiple", "each", "any", etc., "at least one" includes one, two or more, "multiple" includes two or more, "each" refers to each of the corresponding multiples, and "any" refers to any one of the multiples.

[0021] In existing applications of heat recovery-type fresh air systems, several issues arise that affect both indoor and outdoor environments and equipment performance. Firstly, these systems cannot flexibly control indoor pressure based on actual indoor and outdoor factors, making it difficult to meet diverse usage scenarios and user needs. Secondly, heat recovery-type fresh air systems are equipped with intake and exhaust motors, both operating at specific speeds. To maintain a slightly positive indoor pressure, the exhaust motor typically operates at a lower speed than the intake motor. However, due to differences in the length of the intake and exhaust ducts, the actual airflow may not meet expectations, and it's difficult to accurately determine whether the indoor pressure is positive or negative. Furthermore, some systems only have a separate fresh air inlet, relying on door and window gaps for exhaust, making it impossible to clearly define the indoor pressure. More importantly, this can lead to excessively high positive pressure, negatively impacting the health of residents.

[0022] In view of this, this application proposes a method for controlling indoor micro-positive and negative pressure, applied to an air conditioning system. The air conditioning system includes an exhaust fan. First, the indoor-outdoor pressure difference and the outdoor air quality index are obtained, and the number of indoor pollution scenarios is determined. Then, based on the number of indoor pollution scenarios and the outdoor air quality index, micro-positive pressure control, micro-negative pressure control, or zero pressure difference control are applied to the indoor environment. Specifically, under micro-positive pressure control, a target positive pressure is determined based on the outdoor air quality index, and the motor speed of the exhaust fan is adjusted based on the target positive pressure and the indoor-outdoor pressure difference. Under micro-negative pressure control, a target negative pressure is determined based on the number of indoor pollution scenarios, and the motor speed of the exhaust fan is adjusted based on the target negative pressure and the indoor-outdoor pressure difference. Under zero pressure difference control, the motor speed of the exhaust fan is adjusted based on the indoor-outdoor pressure difference. Based on the number of indoor pollution scenarios and the outdoor air quality index, this application flexibly selects indoor pressure control methods, which can eliminate indoor air problems caused by indoor and outdoor influencing factors and meet diverse usage scenarios and user needs. Furthermore, based on the target positive pressure, target negative pressure, and indoor-outdoor pressure difference, exhaust is achieved by adjusting the speed of the exhaust fan, which can accurately control indoor pressure and ensure the health of residents.

[0023] The embodiments of this application will be further described below with reference to the accompanying drawings.

[0024] like Figure 1 As shown, Figure 1 This is a schematic diagram of an air conditioning system provided in one embodiment of this application. The air conditioning system of this embodiment includes an outdoor unit 100, an indoor unit 200, and a fresh air unit 300. The outdoor unit 100 is located outdoors, while the indoor unit 200 and the fresh air unit 300 are located indoors. The outdoor unit control board and the indoor unit control board 202 communicate with each other, and the fresh air unit control board 303 and the indoor unit control board 202 communicate with each other.

[0025] See also some possible implementations. Figure 1 The outdoor unit 100 is equipped with an outdoor pressure sensor 101 to collect pressure data at its location. The outdoor unit control board sends the collected pressure data to the indoor unit control board 202. The indoor unit 200 is equipped with an indoor pressure sensor 201 to collect pressure data at its location. The indoor unit control board 202 collects this pressure data. The fresh air unit 300 has an intake fan motor 301 for air intake and an exhaust fan motor 302 for air exhaust. Both the intake fan motor 301 and the exhaust fan motor 302 are steplessly speed-adjustable DC motors, driven by the fresh air unit control board 303. The fresh air unit control board 303 sends the motor speed to the indoor unit control board 202 to adjust the corresponding speed in real time.

[0026] Those skilled in the art will understand that the system structure shown in the figures does not constitute a limitation on the embodiments of this application, and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0027] Based on the structure of the air conditioning system described above, various embodiments of the indoor micro-positive and negative pressure control method of this application are presented below.

[0028] Reference Figure 2 , Figure 2 This is a flowchart of the steps of an indoor micro-positive and negative pressure control method provided in one embodiment of this application. This application proposes an indoor micro-positive and negative pressure control method, which is applied to an air conditioning system. The air conditioning system includes an exhaust fan. The method may include, but is not limited to, the following steps S100 to S500.

[0029] Step S100: Obtain the indoor-outdoor pressure difference and outdoor air quality index, and determine the number of indoor pollution scenarios; It should be noted that the embodiments of this application obtain indoor and outdoor influencing factors such as indoor and outdoor pressure difference, number of indoor pollution scenarios, and outdoor air quality index, so as to further control the indoor pressure to be in a negative or positive pressure state based on the obtained indoor and outdoor influencing factors.

[0030] As an optional implementation, the air conditioning system further includes an indoor unit and an outdoor unit, and step S100 can be further divided into the following steps S101 to S106: Step S101: Obtain the outdoor air quality index; For example, local weather conditions, including the outdoor air quality index (AQI), can be obtained by reading the local weather information through the Wi-Fi network of the air conditioning system. The AQI is a dimensionless index that quantitatively describes air quality, comprehensively reflecting the degree of air cleanliness or pollution and its impact on health.

[0031] Step S102: Collect the indoor air pressure at the location of the indoor unit and the outdoor air pressure at the location of the outdoor unit; Step S103: Obtain the indoor pressure based on the indoor air pressure, and determine the outdoor air pressure as the outdoor pressure; Specifically, the indoor air pressure P at the location of the indoor unit is collected by an indoor pressure sensor installed on the indoor unit. 内机 The outdoor unit uses an outdoor pressure sensor to collect the outdoor air pressure P at its location. 外机 The outdoor pressure sensor is in direct contact with the outdoor air, therefore the outdoor air pressure P it collects is... 外机 This refers to the current outdoor air pressure value (i.e., the outdoor pressure P). 外 ).

[0032] As an optional implementation, the step of obtaining the indoor side pressure based on the indoor air pressure can be further divided into the following steps S1031 to S1034: Step S1031: If a wired controller is installed indoors, collect the wired controller pressure at the location of the wired controller, and then calculate the average value of the wired controller pressure and the indoor air pressure to obtain the first indoor pressure, and determine the first indoor pressure as the indoor side pressure. Step S1032: If an air sensor is installed indoors, the sensor pressure at the location of the air sensor is collected, and then the average value of the sensor pressure and the indoor air pressure is calculated to obtain the second indoor pressure. The second indoor pressure is then determined as the indoor side pressure. Step S1033: If a wired controller and a personal air sensor are installed indoors, collect the wired controller pressure at the location of the wired controller and the sensor pressure at the location of the personal air sensor, and then calculate the average of the wired controller pressure, the sensor pressure and the indoor air pressure to obtain the third indoor pressure, and determine the third indoor pressure as the indoor side pressure. Step S1034: If no wired controller or air sensor is installed indoors, determine the indoor air pressure as the indoor side pressure.

[0033] It should be noted that, based on different indoor hardware configuration scenarios, this application embodiment introduces mobile / distributed pressure acquisition points such as wired controllers and personal air sensors to cover more indoor spaces. After fusing the collected pressure data, it can more comprehensively reflect the overall indoor air pressure status and improve the accuracy of indoor pressure detection.

[0034] In some alternative embodiments, such as Figure 3 The diagram shows the locations of the indoor wired controller 400 and the air sensor 500. Both the wired controller 400 and the air sensor 500 are equipped with miniature pressure sensors that can collect the pressure at their location in real time, i.e., the wired controller pressure P. 线控 and sensor pressure P 随身 Among them, the air sensor is a movable sensor, and the wired controller collects the wired controller pressure P. 线控 The air pressure P is transmitted to the indoor unit control board via the wired controller and collected by the air sensor. 随身 The data is transmitted wirelessly to the indoor unit control board.

[0035] Specifically, if a wired controller is installed indoors but a personal air sensor is not, the indoor pressure... If the room is equipped with a personal air sensor but not a wired controller, the indoor pressure will be... If a wired controller and a personal air sensor are installed indoors, the indoor pressure will be... If only an indoor unit is installed indoors, without a wired controller and a personal air sensor, then the indoor pressure... .

[0036] Step S104: Subtract the indoor pressure from the outdoor pressure to obtain the indoor-outdoor pressure difference; Specifically, the indoor-outdoor pressure difference ΔP is a real-time calculated value, which is obtained by the following formula: .

[0037] Step S105: Monitor the situation of people in the room and determine the indoor pollution scenario based on the situation of people in the room; Step S106: Statistically analyze indoor pollution scenarios to obtain the number of indoor pollution scenarios.

[0038] Specifically, in this embodiment, the indoor unit is further equipped with a radar sensor and a carbon dioxide sensor. These sensors monitor the indoor occupants to determine if any indoor pollution scenarios exist. The detected indoor pollution scenarios are then statistically analyzed to obtain the number of indoor pollution scenarios, α. For example, indoor pollution scenarios include, but are not limited to, scenarios where occupants are sick, scenarios where occupants are smoking, scenarios where the number of people in the room exceeds the limit (where the carbon dioxide concentration exceeds a preset threshold as detected by the carbon dioxide sensor), indoor barbecue scenarios, and indoor hot pot scenarios.

[0039] Step S200: Based on the number of indoor pollution scenarios and the outdoor air quality index, implement micro-positive pressure control, micro-negative pressure control, or zero pressure difference control for the indoor environment. It should be noted that, based on the number of indoor pollution scenarios and the outdoor air quality index, the embodiments of this application flexibly select indoor pressure control methods (including micro-positive pressure control, micro-negative pressure control, and zero pressure difference control), which can eliminate indoor air problems caused by indoor and outdoor influencing factors and meet diverse usage scenarios and user needs.

[0040] As an optional implementation, step S200 can be further divided into the following steps S201 to S203: Step S201: When the outdoor air quality index is greater than or equal to the preset air quality threshold, a slight positive pressure control is applied to the indoor environment. Step S202: When the outdoor air quality index is less than the preset air quality threshold, determine the value corresponding to the number of indoor pollution scenarios. Step S203: If the number of indoor and outdoor pollution scenarios is greater than zero, implement micro-negative pressure control indoors; if the number of indoor pollution scenarios is equal to zero, implement zero pressure difference control indoors.

[0041] Specifically, the system intelligently recommends positive or negative room pressure based on the indoor pollution scenario indicator and the outdoor Air Quality Index (AQI). When the outdoor AQI is greater than or equal to the preset air quality threshold m, indicating poor outdoor air quality, a positive pressure setting is recommended for the indoor environment, implementing slight positive pressure control to maintain the indoor pressure P. 内 Higher than outdoor pressure P 外 At this time, indoor air will seep out through the gaps in doors and windows, while outdoor air, due to its lower pressure, cannot flow back in, thus forming a one-way airflow barrier that effectively blocks outdoor pollutants from entering the room. When the outdoor air quality index (AQI) is less than the preset air quality threshold m, it indicates that the current outdoor air quality is excellent, and it is recommended that the indoor pressure be negative to reduce the indoor pressure P. 内 Lower than outdoor pressure P 外 At this point, outdoor air will actively flow into the room, creating an inhalation effect and introducing fresh air into the room. Further analysis is then performed to determine the numerical value corresponding to the number of indoor pollution scenarios (a), and based on this number (a), a choice is made between micro-negative pressure control and zero-pressure differential control.

[0042] If the number of indoor and outdoor pollution scenarios is greater than zero (α > 0), it indicates the presence of one or more pollution sources indoors, resulting in poor indoor air quality. In this case, a slight negative pressure control should be implemented indoors to reduce the indoor pressure P. 内 Lower than outdoor pressure P 外 At this time, outdoor air will actively flow into the room, which can improve the efficiency of indoor pollutant discharge; if the number of indoor pollution scenarios is equal to zero (α=0), it means that there is no significant pollution source indoors, so zero pressure difference control is implemented indoors to maintain natural ventilation.

[0043] Understandably, the preset air quality threshold m can be selected and set based on real-time factors such as season, climate, and time. For example, the preset air quality threshold m can be set to 20, meaning that the outdoor air quality is considered excellent when the outdoor air quality index (AQI) is less than 20.

[0044] Step S300: Under micro-positive pressure control, determine the target positive pressure based on the outdoor air quality index, and then adjust the motor speed of the exhaust fan based on the target positive pressure and the indoor-outdoor pressure difference. Specifically, under micro-positive pressure control, the target positive pressure P is determined based on the outdoor air quality index (AQI). 目标正 Then, based on the target positive pressure P 目标正 Based on the relationship with the indoor and outdoor pressure difference ΔP, the motor speed of the exhaust fan can be reduced or increased to achieve intelligent positive pressure control.

[0045] As an optional implementation, the step of determining the target positive pressure based on the outdoor air quality index, and then adjusting the motor speed of the exhaust fan based on the target positive pressure and the indoor-outdoor pressure difference, can be further divided into the following steps S301 to S304: Step S301: Calculate the weather coefficient based on the outdoor air quality index; Step S302: Calculate the target positive pressure based on the default positive pressure value and the weather coefficient; Specifically, the weather coefficient β is calculated based on the outdoor air quality index (AQI) using the following formula: ; When the outdoor air quality index (AQI) is less than or equal to 1, the weather coefficient β is taken as 1.

[0046] Then, based on the default value of positive pressure 'a' and the weather coefficient 'β', the target positive pressure P is calculated using the following formula. 目标正 : ; In some optional embodiments, before intelligent control of indoor pressure, users can manually set the micro-positive pressure levels I, II, and III according to their preferences. When the user selects the manual setting and activates pressure control, the system initially operates according to the default values. The system's default positive pressure is set to 'a' Pa, corresponding to user-configurable level II, micro-positive pressure level I to 'ab' Pa, and level III to 'a+b' Pa. Here, 'a' and 'b' are constants, with 'a' > 'b'. The value of 'a' can be set from 0 to 80 Pa. For example, if the default positive pressure value 'a' is set to 50 Pa and 'b' to 20 Pa, then micro-positive pressure level I is 30 Pa, micro-positive pressure level II is 50 Pa, and micro-positive pressure level III is 70 Pa.

[0047] Step S303: When the indoor and outdoor pressure difference is greater than the target positive pressure, the first target speed is calculated based on the current speed of the exhaust fan, the target positive pressure and the indoor and outdoor pressure difference, and then the motor speed is increased to the first target speed. Step S304: When the indoor-outdoor pressure difference is less than the target positive pressure, the second target speed is calculated based on the current speed of the exhaust fan, the target positive pressure, and the indoor-outdoor pressure difference, and then the motor speed is reduced to the second target speed.

[0048] In some optional embodiments, when the indoor-outdoor pressure difference ΔP is greater than the target positive pressure P 目标正 (△P>P) 目标正 This indicates the indoor pressure P. 内 If the pressure is too high, the exhaust fan motor speed needs to be increased to accelerate the exhaust of indoor air and reduce the indoor pressure P. 内Reduce speed; at this point, increase the motor speed of the exhaust fan until the motor speed reaches the first target speed R1, which is calculated using the following formula: ; When the indoor-outdoor pressure difference ΔP is less than the target positive pressure P 目标正 (△P<P) 目标正 This indicates the indoor pressure P. 内 If the positive pressure requirement is not met, the motor speed of the exhaust fan needs to be reduced to decrease the rate at which indoor air is exhausted, thereby increasing the indoor pressure P. 内 The speed increases; at this point, the speed of the exhaust motor is reduced until the motor speed reaches the second target speed R2, which is calculated using the following formula: ; When the indoor-outdoor pressure difference ΔP equals the target positive pressure P 目标正 (△P=P) 目标正 If the current control is maintained, the motor speed will remain constant.

[0049] Where, r 当前 This indicates the current speed of the exhaust fan in the current calculation cycle, with an adjustment cycle of e seconds (e is a constant, which can be selected as 30 seconds).

[0050] Step S400: Under micro negative pressure control, determine the target negative pressure based on the number of indoor pollution scenarios, and then adjust the motor speed of the exhaust fan based on the target negative pressure and the indoor-outdoor pressure difference. Specifically, under micro-negative pressure control, the target negative pressure P is determined based on the number of indoor pollution scenarios (α). 目标负 Furthermore, based on the target negative pressure P 目标负 Based on the relationship with the indoor and outdoor pressure difference ΔP, the motor speed of the exhaust fan can be reduced or increased to achieve intelligent negative pressure control.

[0051] As an optional implementation, the step of determining the target negative pressure based on the number of indoor pollution scenarios, and then adjusting the motor speed of the exhaust fan based on the target negative pressure and the indoor-outdoor pressure difference, can be further divided into the following steps S401 to S404: Step S401: Determine the pressure correction unit value; Step S402: Calculate the target negative pressure based on the default negative pressure value, the number of indoor pollution scenarios, and the pressure correction unit value; Specifically, when there are multiple indoor pollution scenarios (α), such as detecting an indoor occupant being sick and another indoor occupant smoking, a pressure correction unit value γ is added for each additional scenario. If there is only one scenario, no additional value is needed. It is understood that the pressure correction unit value γ can be set based on factors such as indoor area, indoor temperature, and indoor function type (e.g., office, bedroom, kitchen); for example, the pressure correction unit value γ is set to 10 Pa.

[0052] After determining the pressure correction unit value γ, the target negative pressure P is calculated using the following formula, based on the default negative pressure value c, the number of indoor pollution scenarios a, and the pressure correction unit value γ. 目标负 : ; In some optional embodiments, before intelligent control of indoor pressure, users can manually set the micro-negative pressure levels I, II, and III according to their preferences. When the user selects a manual setting and activates pressure control, the system initially operates according to the default values. The system's default negative pressure value is set to c Pa, corresponding to user-configurable level II; level I is cd Pa; and level III is c+d Pa. Here, c and d are constants, with c > d, and the value of c can be set from 0 to 80 Pa. For example, if the default negative pressure value c is set to 40 Pa and d is set to 20 Pa, then level I is 20 Pa, level II is 40 Pa, and level III is 60 Pa.

[0053] Step S403: When the indoor-outdoor pressure difference is greater than the negative value of the target negative pressure, the third target speed is calculated based on the current speed of the exhaust fan, the target negative pressure, and the indoor-outdoor pressure difference, and then the motor speed is increased to the third target speed. Step S404: When the indoor-outdoor pressure difference is less than the negative value of the target negative pressure, the fourth target speed is calculated based on the current speed of the exhaust fan, the target negative pressure, and the indoor-outdoor pressure difference, and then the motor speed is reduced to the fourth target speed.

[0054] In some optional embodiments, when the indoor-outdoor pressure difference ΔP is greater than the target negative pressure P 目标负 negative value (-P) 目标负 -ΔP<0) indicates that the indoor side pressure P 内 If the negative pressure requirement is not met, the motor speed of the exhaust fan needs to be increased to accelerate the exhaust of indoor air and increase the indoor pressure P. 内 Reduce speed; at this point, increase the speed of the exhaust motor until it reaches the third target speed R3, which is calculated using the following formula: ; When the indoor-outdoor pressure difference ΔP is less than the target negative pressure P 目标负 negative value (-P)目标负 -△P>0) indicates that the indoor side pressure P 内 If the pressure is too low, the motor speed of the exhaust fan needs to be reduced to increase the indoor pressure P. 内 The airflow increases, reducing the amount of indoor air flowing outdoors. At this point, the exhaust fan motor speed is reduced until it reaches the fourth target speed R4, which is calculated using the following formula: ; When the indoor-outdoor pressure difference ΔP equals the target negative pressure P 目标负 negative value (-P) 目标负 If -△P=0), then maintain the current control and keep the motor speed constant.

[0055] Where, r 当前 This indicates the current speed of the exhaust fan in the current calculation cycle, with an adjustment cycle of e seconds (e is a constant, which can be selected as 30 seconds).

[0056] Step S500: Under zero differential pressure control, adjust the motor speed of the exhaust fan according to the indoor and outdoor pressure difference.

[0057] Specifically, under zero differential pressure control, the motor speed of the exhaust fan is reduced or increased according to the indoor-outdoor pressure difference ΔP to achieve intelligent zero differential pressure control.

[0058] As an optional implementation, the step of adjusting the motor speed of the exhaust fan according to the indoor and outdoor pressure difference can be further divided into the following steps S501 and S502: Step S501: When the indoor-outdoor pressure difference is less than zero, the fifth target speed is calculated based on the current speed of the exhaust fan, the indoor-outdoor pressure difference, and the outdoor pressure, and then the motor speed is reduced to the fifth target speed. Step S502: When the indoor and outdoor pressure difference is greater than zero, the sixth target speed is calculated based on the current speed of the exhaust fan, the indoor and outdoor pressure difference, and the indoor pressure, and then the motor speed is increased to the sixth target speed.

[0059] In some optional embodiments, when the indoor-outdoor pressure difference ΔP is less than zero (ΔP < 0), it indicates that the indoor pressure P 内 Higher than outdoor pressure P 外 To reduce the exhaust fan motor speed, the amount of indoor air discharged should be reduced, thus lowering the indoor pressure P. 内 Rebound to the outdoor pressure P 外 Equal; at this point, reduce the speed of the exhaust fan motor until the motor speed reaches the fifth target speed R5, which is calculated using the following formula: ; When the pressure difference between indoors and outdoors, ΔP, is greater than zero (ΔP > 0), it indicates that the pressure on the indoor side, P...内 Lower than outdoor pressure P 外 It is necessary to increase the motor speed of the exhaust fan to accelerate the exhaust of indoor air and reduce the indoor pressure P. 内 Decrease to the outdoor pressure P 外 Equal; at this point, increase the exhaust motor speed until the motor speed reaches the sixth target speed R6, which is calculated using the following formula: ; When the indoor-outdoor pressure difference ΔP is zero (ΔP=0), the current control is maintained, and the motor speed remains constant.

[0060] Where, r 当前 This indicates the current speed of the exhaust fan in the current calculation cycle, with an adjustment cycle of e seconds (e is a constant, which can be selected as 30 seconds).

[0061] In summary, the processing flow of the indoor micro-positive and negative pressure control method in this application embodiment is as follows: Figure 4 As shown: The first step is to obtain the outdoor air quality index (AQI) and the indoor-outdoor pressure difference (ΔP). The second step is to determine the relationship between the outdoor air quality index (AQI) and the preset air quality threshold m. The third step is to implement micro-positive pressure control indoors when AQI ≥ m: determine the target positive pressure P based on the outdoor air quality index (AQI). 目标正 Therefore, the target positive pressure P can be determined. 目标正 The relationship with the indoor-outdoor pressure difference ΔP, if ΔP > P 目标正 Increase the motor speed of the exhaust fan to the first target speed R1. If ΔP < P 目标正 Reduce the motor speed of the exhaust fan to the second target speed R2; The fourth step is to detect indoor pollution scenarios and determine the value of the number of indoor pollution scenarios, α, when AQI < m. Step 5: When α > 0, implement micro-negative pressure control indoors: Determine the target negative pressure P based on the number of indoor pollution scenarios α. 目标负 Then determine the target negative pressure P. 目标负 The relationship with the indoor-outdoor pressure difference ΔP, if -P 目标负 If -△P < 0, increase the exhaust fan motor speed to the third target speed R3. 目标负 -△P>0, reduce the motor speed of the exhaust fan to the fourth target speed R4; Step 6: When α < 0, perform zero differential pressure control indoors: Determine whether the indoor-outdoor pressure difference ΔP is greater than 0. If ΔP < 0, reduce the motor speed of the exhaust fan to the fifth target speed R5. If ΔP > 0, increase the motor speed of the exhaust fan to the sixth target speed R6.

[0062] The control flow of the indoor micro-positive and negative pressure control method according to the embodiments of this application has been described above. It can be recognized that, compared with the existing heat recovery type fresh air unit pressure control method, this application has the following advantages: I. Based on the number of indoor pollution scenarios and the outdoor air quality index, the indoor pressure control method (including micro-positive pressure control, micro-negative pressure control and zero pressure difference control) can be flexibly selected to eliminate indoor air problems caused by indoor and outdoor influencing factors and meet diverse usage scenarios and user needs. Second, based on different indoor hardware configuration scenarios, by introducing mobile / distributed pressure acquisition points such as wired controllers and personal air sensors, more indoor spaces can be covered. After the collected pressure data is integrated, it can more comprehensively reflect the overall indoor air pressure status and improve the accuracy of indoor pressure detection. Third, based on the target positive pressure, target negative pressure, and indoor-outdoor pressure difference, exhaust is achieved by adjusting the speed of the exhaust fan, which can accurately control the indoor pressure to the target positive or negative pressure, ensuring the health of the residents.

[0063] Based on the above-described method for controlling indoor micro-positive and negative pressure, various embodiments of the controller, air conditioning system, and computer-readable storage medium of this application are presented below.

[0064] Reference Figure 5 One embodiment of this application provides a controller, including: At least one processor 710; At least one memory 720 is used to store at least one program; When at least one program is executed by at least one processor 710, the at least one processor 710 implements the aforementioned indoor micro-positive and negative pressure control method.

[0065] It is evident that the content of the above method embodiments is applicable to this controller embodiment. The specific functions implemented by this controller embodiment are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0066] This application also provides an air conditioning system, including the aforementioned controller.

[0067] Similarly, the content of the above method embodiments is applicable to this system embodiment. The specific functions implemented in this system embodiment are the same as those in the above method embodiments, and the beneficial effects achieved are also the same as those achieved in the above method embodiments.

[0068] This application embodiment also provides a computer-readable storage medium storing a program executable by a processor 710, which, when executed by the processor 710, is used to perform the above-described indoor micro-positive and negative pressure control method.

[0069] Similarly, the content of the above method embodiments is applicable to this storage medium embodiment. The specific functions implemented in this storage medium embodiment are the same as those in the above method embodiments, and the beneficial effects achieved are also the same as those achieved in the above method embodiments.

[0070] Those skilled in the art will understand that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include computer-readable storage media (or non-transitory media) and communication media (or transient media). As is known to those skilled in the art, the term computer-readable storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer-readable storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, as is known to those skilled in the art, communication media typically contain computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0071] In the foregoing description of this specification, the references to terms such as "one embodiment," "another embodiment," or "some embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0072] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

[0073] The above is a detailed description of the preferred embodiments of this application, but this application is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of this application, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A method for controlling indoor micro-positive and negative pressure, characterized in that, Applied to an air conditioning system, wherein the air conditioning system includes an exhaust fan, the method includes the following steps: Obtain the indoor-outdoor pressure difference and outdoor air quality index, and determine the number of indoor pollution scenarios; Based on the number of indoor pollution scenarios and the outdoor air quality index, the indoor environment is controlled by micro-positive pressure, micro-negative pressure, or zero pressure difference. Under the micro-positive pressure control, the target positive pressure is determined according to the outdoor air quality index, and then the motor speed of the exhaust fan is adjusted according to the target positive pressure and the indoor-outdoor pressure difference; Under the micro-negative pressure control, the target negative pressure is determined according to the number of indoor pollution scenarios, and then the motor speed of the exhaust fan is adjusted according to the target negative pressure and the indoor-outdoor pressure difference; Under the zero differential pressure control, the motor speed of the exhaust fan is adjusted according to the indoor and outdoor pressure difference.

2. The method according to claim 1, characterized in that, The air conditioning system also includes an indoor unit and an outdoor unit. The steps of acquiring the indoor-outdoor pressure difference and the outdoor air quality index, and determining the number of indoor pollution scenarios, include: Obtain the outdoor air quality index; The indoor air pressure at the location of the indoor unit and the outdoor air pressure at the location of the outdoor unit are collected. The indoor pressure is obtained based on the indoor air pressure, and the outdoor air pressure is determined as the outdoor pressure. The indoor-outdoor pressure difference is obtained by subtracting the indoor-side pressure from the outdoor-side pressure. Monitor the situation of people indoors and determine the indoor pollution scenario based on the situation of people indoors; The number of indoor pollution scenarios is obtained by statistically analyzing the aforementioned indoor pollution scenarios.

3. The method according to claim 2, characterized in that, The process of obtaining the indoor side pressure based on the indoor air pressure includes: If a wired controller is installed indoors, the pressure of the wired controller at its location is collected, and then the average value of the wired controller pressure and the indoor air pressure is calculated to obtain the first indoor pressure, which is then determined as the indoor side pressure. If a personal air sensor is installed indoors, the sensor pressure at the location of the personal air sensor is collected, and then the average value of the sensor pressure and the indoor air pressure is calculated to obtain the second indoor pressure, which is then determined as the indoor side pressure. If a wired controller and a personal air sensor are installed indoors, the pressure of the wired controller at the location of the wired controller and the pressure of the personal air sensor at the location of the personal air sensor are collected. Then, the average value of the wired controller pressure, the sensor pressure and the indoor air pressure is calculated to obtain a third indoor pressure, and the third indoor pressure is determined as the indoor side pressure. If no wired controller and air sensor are installed indoors, the indoor air pressure is determined to be the indoor side pressure.

4. The method according to claim 1, characterized in that, The method of controlling indoor air quality based on the number of indoor pollution scenarios and the outdoor air quality index, including: (1) Implementing micro-positive pressure control, micro-negative pressure control, or zero-pressure differential control, When the outdoor air quality index is greater than or equal to the preset air quality threshold, the indoor air quality is controlled with a slight positive pressure. When the outdoor air quality index is less than the preset air quality threshold, determine the value corresponding to the number of indoor pollution scenarios. If the number of indoor and outdoor pollution scenarios is greater than zero, the indoor area is controlled by a slight negative pressure; if the number of indoor pollution scenarios is equal to zero, the indoor area is controlled by zero differential pressure.

5. The method according to claim 1, characterized in that, The step of determining the target positive pressure based on the outdoor air quality index, and then adjusting the motor speed of the exhaust fan based on the target positive pressure and the indoor-outdoor pressure difference, includes: The weather coefficient is calculated based on the outdoor air quality index. The target positive pressure is calculated based on the default positive pressure value and the weather coefficient. When the indoor-outdoor pressure difference is greater than the target positive pressure, a first target speed is calculated based on the current speed of the exhaust fan, the target positive pressure, and the indoor-outdoor pressure difference, and then the motor speed is increased to the first target speed. When the indoor-outdoor pressure difference is less than the target positive pressure, a second target speed is calculated based on the current speed of the exhaust fan, the target positive pressure, and the indoor-outdoor pressure difference, and then the motor speed is reduced to the second target speed.

6. The method according to claim 1, characterized in that, The step of determining the target negative pressure based on the number of indoor pollution scenarios, and then adjusting the motor speed of the exhaust fan based on the target negative pressure and the indoor-outdoor pressure difference, includes: Determine the pressure correction unit value; The target negative pressure is calculated based on the default negative pressure value, the number of indoor pollution scenarios, and the pressure correction unit value. When the indoor-outdoor pressure difference is greater than the negative value of the target negative pressure, a third target speed is calculated based on the current speed of the exhaust fan, the target negative pressure, and the indoor-outdoor pressure difference, and then the motor speed is increased to the third target speed. When the indoor-outdoor pressure difference is less than the negative value of the target negative pressure, a fourth target speed is calculated based on the current speed of the exhaust fan, the target negative pressure, and the indoor-outdoor pressure difference, and then the motor speed is reduced to the fourth target speed.

7. The method according to claim 2, characterized in that, The step of adjusting the motor speed of the exhaust fan according to the indoor-outdoor pressure difference includes: When the indoor-outdoor pressure difference is less than zero, the fifth target speed is calculated based on the current speed of the exhaust fan, the indoor-outdoor pressure difference, and the outdoor pressure, and then the motor speed is reduced to the fifth target speed. When the indoor-outdoor pressure difference is greater than zero, the sixth target speed is calculated based on the current speed of the exhaust fan, the indoor-outdoor pressure difference, and the indoor pressure, and then the motor speed is increased to the sixth target speed.

8. A controller, characterized in that, include: At least one processor; At least one memory for storing at least one program; When the at least one program is executed by the at least one processor, the at least one processor implements the method as described in any one of claims 1 to 7.

9. An air conditioning system, characterized in that, Includes the controller as described in claim 8.

10. A computer-readable storage medium storing a processor-executable program, characterized in that, The processor-executable program implements the method as described in any one of claims 1 to 7 when executed by the processor.

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