Linkage control method and device for fresh air ventilator and indoor unit and air conditioner

Abstract

The invention discloses a linkage control method and device for a fresh air ventilator and an indoor unit and an air conditioner, and relates to the technical field of intelligent home furnishing.The linkage control method for the fresh air ventilator and the indoor unit comprises the steps that the linkage setting state of the fresh air ventilator and the indoor unit is detected; when the linkage setting state is effective and the indoor unit receives a starting instruction, the operation mode and the air speed of the fresh air ventilator are dynamically adjusted according to a preset rule; the preset rule comprises an operation mode adjustment rule based on indoor and outdoor temperature difference and a start-stop control rule based on carbon dioxide concentration. The defects that in the prior art, linkage control logic of the fresh air ventilator and the indoor unit is single, and dynamic adjustment cannot be conducted according to environmental parameters are overcome, intelligent linkage control based on the temperature difference and the carbon dioxide concentration is achieved, and the energy efficiency and comfort are remarkably improved.

Description

Technical Field

[0001] The present application relates to the field of smart home technology, and in particular to a linkage control method and device for a fresh air fan and an indoor unit, and an air conditioner. Background Art

[0002] With the continuous development of modern building technology and the increasing demand for indoor environmental quality, multi-split air conditioning systems (VRS) have gained widespread adoption in commercial buildings, office spaces, and high-end residences due to their high efficiency, energy efficiency, and flexibility. VRS systems connect multiple indoor units to one or more outdoor units, enabling independent temperature control in different areas and significantly improving space and energy efficiency. However, while pursuing efficient cooling and heating, further improving indoor air quality and ensuring a comfortable and healthy indoor environment has become a new challenge facing current air conditioning system design.

[0003] Currently, there are several technical solutions on the market for linking the control of fresh air fans with multi-split systems. Most of these solutions rely on a simple on / off control of the indoor unit to start and stop the fresh air fans. Specifically, when the indoor unit is on, the fresh air fans start; when the indoor unit is off, the fresh air fans stop. Some advanced systems also integrate temperature sensors to fine-tune the fresh air fan's operating status by monitoring the indoor / outdoor temperature difference. However, these control strategies are often relatively simple and lack adaptability to complex environmental changes. This can lead to low system energy efficiency or insufficient indoor comfort under specific environmental conditions.

[0004] Therefore, how to achieve intelligent linkage control based on indoor and outdoor temperature difference stratification, improve energy efficiency and comfort through wind speed grading, and develop new fan type adaptive strategies are important issues that need to be urgently addressed in the industry. Summary of the Invention

[0005] The present application provides a linkage control method, device and air conditioner for a fresh air fan and an indoor unit, which is used to solve the defects of the existing technology that the linkage control logic of the fresh air fan and the indoor unit is single and cannot be dynamically adjusted according to environmental parameters. It realizes intelligent linkage control based on temperature difference and carbon dioxide concentration, significantly improving energy efficiency and comfort.

[0006] The present application provides a linkage control method for a fresh air fan and an indoor unit, comprising: Check the linkage setting status of the fresh air fan and the indoor unit; When the linkage setting status is valid and the indoor unit receives a power-on command, the operation mode and wind speed of the fresh air fan are dynamically adjusted according to preset rules; the preset rules include operation mode adjustment rules based on indoor and outdoor temperature differences and start-stop control rules based on carbon dioxide concentration.

[0007] According to a linkage control method for a fresh air fan and an indoor unit provided in the present application, the operation mode and wind speed of the fresh air fan are dynamically adjusted according to the start-stop control rules based on the carbon dioxide concentration, specifically including: when it is detected that the indoor carbon dioxide concentration is not less than a first threshold value, the fresh air fan is controlled to start operation; when it is detected that the indoor carbon dioxide concentration is less than a second threshold value, the fresh air fan is controlled to act according to other linkage instructions; wherein, the second threshold value is less than the first threshold value.

[0008] According to a linkage control method for a fresh air fan and an indoor unit provided in the present application, the operation mode adjustment rule based on the indoor and outdoor temperature difference includes a cooling mode control sub-rule and a heating mode control sub-rule.

[0009] According to a linkage control method for a fresh air fan and an indoor unit provided in the present application, the operation mode and wind speed of the fresh air fan are dynamically adjusted according to the cooling mode control sub-rule, specifically including: when the indoor unit is in cooling mode and the fresh air fan is not turned on, if the outdoor temperature and the indoor set temperature meet the first preset condition, the fresh air fan is controlled to turn on the air supply mode; when both the indoor unit and the fresh air fan are in cooling mode, if the outdoor temperature and the indoor set temperature meet the second preset condition, the fresh air fan is controlled to operate in air supply mode or cooling mode.

[0010] According to a linkage control method of a fresh air fan and an indoor unit provided in the present application, the operation mode and wind speed of the fresh air fan are dynamically adjusted according to the heating mode control sub-rule, specifically including: when the indoor unit is in heating mode and the fresh air fan is not turned on, if the outdoor temperature and the indoor set temperature meet the third preset condition, the fresh air fan is controlled to turn on the air supply mode; when both the indoor unit and the fresh air fan are in heating mode, if the outdoor temperature and the indoor temperature meet the fourth preset condition, the fresh air fan is controlled to operate in the air supply mode or the heating mode.

[0011] According to a linkage control method for a fresh air fan and an indoor unit provided in the present application, the preset rules also include priority control sub-rules and protection control sub-rules.

[0012] According to a linkage control method for a fresh air fan and an indoor unit provided in the present application, the operation mode and wind speed of the fresh air fan are dynamically adjusted according to the priority control sub-rules, specifically including: when any control condition meets the fresh air fan operation condition, the fresh air fan is started to operate; only when all control conditions meet the fresh air fan stop condition, the fresh air fan is controlled to stop.

[0013] According to a linkage control method for a fresh air fan and an indoor unit provided in the present application, the operation mode and wind speed of the fresh air fan are dynamically adjusted according to the protection control sub-rules, specifically including: controlling the operation state of the fresh air fan according to the type corresponding to the air quality parameters; the air quality parameters include PM2.5 concentration, volatile organic compound concentration or dust concentration.

[0014] The present application also provides a linkage control device for a fresh air fan and an indoor unit, comprising: Status detection module, used to detect the linkage setting status of the fresh air fan and the indoor unit; The fresh air fan control module is used to dynamically adjust the operation mode and wind speed of the fresh air fan according to preset rules when the linkage setting status is valid and the indoor unit receives a power-on command; the preset rules include operation mode adjustment rules based on indoor and outdoor temperature differences and start-stop control rules based on carbon dioxide concentration.

[0015] The present application also provides an air conditioner, comprising a memory and a processor, wherein the memory stores a computer program, and the processor is configured to execute the computer program to implement any of the above-mentioned linkage control methods for the fresh air fan and the indoor unit.

[0016] The present application also provides a computer-readable storage medium, which includes a stored program, wherein when the program is run, it executes and implements any of the above-mentioned linkage control methods for the fresh air fan and the indoor unit.

[0017] The present application also provides a computer program product, including a computer program, which, when executed by a processor, implements any of the above-mentioned linkage control methods for the fresh air fan and the indoor unit.

[0018] The linkage control method, device and air conditioner for the fresh air fan and indoor unit provided in this application effectively solve the problem of the single linkage control logic of the traditional fresh air fan and indoor unit by detecting the linkage setting status and dynamically adjusting the fresh air fan operation mode and wind speed based on preset rules, so that the system can be intelligently adjusted according to the actual environmental parameters. By introducing the operation mode adjustment rules based on the indoor and outdoor temperature difference, the system can automatically determine the optimal operation mode, avoiding the excessive cooling or heating phenomenon existing in the traditional system, significantly improving energy utilization efficiency and reducing energy consumption. By combining the start-stop control rules of carbon dioxide concentration, not only can the indoor air quality be guaranteed, but the system can also automatically shut down when fresh air is not needed, further saving energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0021] Figure 1 Schematic diagram of the hardware environment of a linkage control method for a fresh air fan and an indoor unit according to an embodiment of the present application; Figure 2 This is a flow chart of the linkage control method of the fresh air fan and the indoor unit provided in this application; Figure 3 This is a schematic diagram of the linkage device setting and rule setting interface provided by this application; Figure 4 This is a schematic diagram of the structure of the linkage control device of the fresh air fan and the indoor unit provided in this application Figure 5 It is a structural diagram of the air conditioner provided in this application. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0023] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in a sequence other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0024] Existing technologies include direct evaporative and linked control types. Direct evaporative systems use surface coolers for cooling, resulting in high energy consumption but rapid cooling. Most linked control systems simply start and stop the fan based on the indoor unit's on / off status, without temperature differential control. Consequently, the linked control logic between the fan and indoor unit is simplistic, unable to dynamically adjust the operating mode (e.g., air supply / cooling / heating) and air speed based on the indoor / outdoor temperature difference. This results in low energy efficiency (e.g., overcooling / heating) or insufficient comfort (e.g., large temperature fluctuations). To solve the above problems, this application links the fresh air fan and the indoor unit through Modbus communication, and uses a built-in temperature sensor to realize intelligent linkage control based on indoor and outdoor temperature difference stratification, and improves energy efficiency and comfort through wind speed grading.

[0025] The embodiments of the present invention are described in detail below.

[0026] According to one aspect of an embodiment of the present application, a linkage control method for a fresh air blower and an indoor unit is provided. The linkage control method for a fresh air blower and an indoor unit is widely used in whole-house intelligent digital control application scenarios such as smart home, smart home, smart home device ecology, and smart residence ecology. Optionally, in this embodiment, the linkage control method for a fresh air blower and an indoor unit can be applied to Figure 1 In the hardware environment shown in FIG. 1 , which is composed of a terminal device 102 and a server 104. Figure 1 As shown, the server 104 is connected to the terminal device 102 via a network, and can be used to provide services (such as application services, etc.) for the terminal or a client installed on the terminal. A database can be set up on the server or independently of the server to provide data storage services for the server 104. Cloud computing and / or edge computing services can be configured on the server or independently of the server to provide data computing services for the server 104.

[0027] The aforementioned network may include, but is not limited to, at least one of the following: a wired network and a wireless network. The aforementioned wired network may include, but is not limited to, at least one of the following: a wide area network, a metropolitan area network, and a local area network. The aforementioned wireless network may include, but is not limited to, at least one of the following: Wi-Fi (Wireless Fidelity) and Bluetooth. The terminal device 102 may include, but is not limited to, a PC, a mobile phone, a tablet computer, a smart air conditioner, a smart range hood, a smart refrigerator, a smart oven, a smart stove, a smart washing machine, a smart water heater, a smart washing machine, a smart dishwasher, a smart projector, a smart TV, a smart clothes drying rack, smart curtains, a smart audio / video system, a smart socket, a smart speaker, a smart fresh air system, smart kitchen and bathroom equipment, smart bathroom equipment, a smart robot vacuum, a smart window cleaning robot, a smart robot mop, a smart air purifier, a smart steamer, a smart microwave oven, a smart kitchen appliance, a smart purifier, a smart water dispenser, a smart door lock, and the like.

[0028] Figure 2 This is one of the flowcharts of the method for upgrading the intelligent voice network device provided in an embodiment of the present application, which includes the following steps: S210: Detect the linkage setting status of the fresh air fan and the indoor unit.

[0029] Specifically, the system checks linkage status through the following steps: 1) The main controller reads the linkage status register every 200 milliseconds. This register is regularly updated by the indoor unit via the Modbus protocol. 2) When bit 0 of the register is detected as "1," the linkage function is determined to be active, and the CRC checksum is verified to ensure data reliability. 3) The level of the linkage enable signal line is checked via the hardware IO port; a high level indicates that the physical switch is on. This dual verification mechanism ensures that the linkage setting is only valid when both the register flag and the hardware signal are valid. The system has a 3-second status hold delay to prevent misjudgments caused by momentary communication interruptions. The "Linkage in Progress" icon and the last communication timestamp are displayed in real time on the OLED screen. Users can view a detailed status report by briefly pressing the "Linkage Query" button on the control panel.

[0030] The above-mentioned linkage status detection method improves the reliability of detection compared with the traditional single detection method.

[0031] S220: When the linkage setting status is valid and the indoor unit receives a power-on command, the operation mode and wind speed of the fresh air fan are dynamically adjusted according to preset rules. The preset rules include an operation mode adjustment rule based on the indoor and outdoor temperature difference and a start-stop control rule based on carbon dioxide concentration.

[0032] Specifically, after the user sets the rules and linkage devices, the unit receives the start-up instruction, and then detects that the linkage between the fresh air fan and the unit is effective, and then starts the operation of the fresh air fan. Figure 3 In the interface shown, first define a rule. You can select the execution date of the rule, such as weekly cycle, monthly cycle, and custom time cycle. Then select the device to be linked at that time. After the rule is created, you can define the rule content.

[0033] According to a linkage control method for a fresh air fan and an indoor unit provided in the present application, the operation mode and wind speed of the fresh air fan are dynamically adjusted according to the start-stop control rules based on the carbon dioxide concentration, specifically including: when it is detected that the indoor carbon dioxide concentration is not less than a first threshold value, the fresh air fan is controlled to start operation; when it is detected that the indoor carbon dioxide concentration is less than a second threshold value, the fresh air fan is controlled to operate according to other linkage instructions; wherein, the second threshold value is less than the first threshold value.

[0034] Specifically, the system first monitors the indoor carbon dioxide concentration in real time using a carbon dioxide sensor and transmits the detection data to the control unit. When the indoor carbon dioxide concentration reaches or exceeds a preset first threshold (e.g., 1000 ppm), the control unit automatically activates the fresh air blower to perform ventilation operations, introducing fresh outdoor air into the room. When the carbon dioxide concentration drops below a second threshold (e.g., 600 ppm), the control unit adjusts the operating state of the fresh air blower based on other linkage conditions (e.g., temperature and humidity parameters, user-set mode, etc.). In this embodiment, the difference between the first and second thresholds (e.g., 400 ppm) can effectively prevent the fresh air blower from frequently starting and stopping near the critical value, while allowing users to customize these two threshold parameters according to actual needs.

[0035] For example, when the indoor unit associated with the fresh air fan is connected to a CO2 concentration test sensor or device, automatic linkage control is performed according to the CO2 concentration a when the fresh air fan is turned on and the CO2 concentration b when the fresh air fan is stopped, which are set by the user.

[0036] When the CO2 concentration detected indoors is ≥a, the fresh air blower starts running; When the CO2 concentration detected indoors is less than b, the fresh air fan will operate according to other linkage instructions.

[0037] Among them, the above b<a, the values ​​of a and b can be set by the user. The factory default values ​​of a are 1000PPM and b are 600PPM.

[0038] Through the intelligent monitoring and response mechanism of carbon dioxide concentration, multiple technical advantages are achieved: 1) Accurately guarantee indoor air quality, and start ventilation in time when the carbon dioxide concentration exceeds the standard, avoiding discomfort such as stuffiness and dizziness caused by poor air circulation; 2) Adopt a dual-threshold control strategy to prevent frequent start and stop of equipment (by setting a reasonable threshold difference) and avoid energy waste (by switching modes in time after the concentration reaches the standard); 3) Parameters can be customized to meet the needs of different scenarios. For example, lower thresholds (such as 800 / 500ppm) can be set in conference rooms, and the standards can be appropriately relaxed in warehouses; 4) Work in conjunction with other linkage conditions to take into account temperature and humidity regulation while ensuring air quality, forming a multi-dimensional environmental optimization system.

[0039] According to a linkage control method for a fresh air fan and an indoor unit provided in the present application, the operation mode adjustment rules based on the indoor and outdoor temperature difference include cooling mode control sub-rules and heating mode control sub-rules.

[0040] Specifically, the system uses temperature sensors to collect real-time indoor temperature, indoor unit setpoint temperature, and outdoor temperature data. When the indoor unit is in cooling mode, the cooling mode control sub-rule automatically activates: If the outdoor temperature is ≤ -2°C (for example, if the outdoor temperature is ≤ 24°C when the setting is 26°C), the fresh air fan switches to supply mode, directly introducing cool outdoor air for natural cooling. If the outdoor temperature is > +2°C (for example, if the setting is 26°C), and > or = the indoor temperature, the current linkage command is maintained. If the outdoor temperature is between the indoor unit setpoint and ≥ +2°C (for example, if the setting is 26°C, the outdoor temperature is 27°C and the indoor temperature is 29°C), supply mode is activated to utilize the temperature difference for cooling. The heating mode control sub-rule operates symmetrically: If the outdoor temperature is > +2°C (for example, if the outdoor temperature is ≤ -2°C (for example, if the setting is 26°C), supply mode is activated to introduce warm outdoor air. If the outdoor temperature is < +2°C (for example, if the setting is ≤ -2°C (for example, if the setting is 26°C), the original command is maintained. Supply mode remains active when the outdoor temperature is below the setpoint but > or = the indoor temperature. All temperature thresholds (±2°C, etc.) are user-configurable.

[0041] This embodiment brings significant progress through the temperature difference stratification control strategy: 1) When the outdoor temperature is suitable (for example, the outdoor temperature is lower than the set value in cooling mode), the air supply mode completely replaces the compressor operation, thereby reducing cooling energy consumption; 2) It avoids the sudden temperature changes caused by the fixed logic of traditional systems (such as mechanical cooling when the outdoor temperature suddenly drops), narrows the range of indoor temperature fluctuations, and improves comfort; 3) Through triple condition judgment (interactive comparison of set temperature, current temperature, and outdoor temperature), accurate decision-making on operating mode is achieved, solving the problem of false operation caused by single threshold control; 4) It can be expanded to different climatic regions. For example, in areas with large temperature differences between day and night, low-temperature outdoor air is automatically used for free cooling at night.

[0042] The operation mode and wind speed of the fresh air fan are dynamically adjusted according to the cooling mode control sub-rule, specifically including: when the indoor unit is in cooling mode and the fresh air fan is not turned on, if the outdoor temperature and the indoor set temperature meet the first preset condition, the fresh air fan is controlled to turn on the air supply mode; when the indoor unit and the fresh air fan are both in cooling mode, if the outdoor temperature and the indoor set temperature meet the second preset condition, the fresh air fan is controlled to operate in air supply mode or cooling mode.

[0043] Furthermore, when the indoor unit is in cooling mode and the fresh air fan is not turned on: if the outdoor temperature is less than or equal to the indoor unit set temperature minus the preset degrees Celsius, the fresh air fan is controlled to turn on the air supply mode; if the outdoor temperature is greater than the indoor unit set temperature plus the preset degrees Celsius, and the outdoor temperature is greater than or equal to the indoor temperature plus the preset degrees Celsius, the fresh air fan is controlled to operate according to the linkage instruction; if the outdoor temperature is greater than the indoor unit set temperature, but less than the indoor temperature minus the preset degrees Celsius, the fresh air fan is controlled to turn on the air supply mode.

[0044] Specifically, the preset temperature is set at 2°C (adjustable based on actual needs). When the user turns on the indoor unit's cooling mode (assuming the indoor unit's set temperature is 26°C) while the fresh air blower is off, the system compares temperature parameters in real time: 1) If the outdoor temperature is detected to be ≤24°C (i.e., ≤26°C - 2°C), the fresh air blower automatically starts in supply mode, drawing cool outdoor air directly into the room. 2) If the outdoor temperature is >28°C (i.e., >26°C + 2°C) and is also >2°C above the indoor temperature + 2°C (e.g., if the indoor temperature is 28°C, the outdoor temperature must be ≥30°C), then other linkage commands are executed (e.g., keeping the fresh air blower off or activating cooling mode). 3) If the outdoor temperature is between 26°C and 28°C but more than 2°C below the indoor temperature (e.g., 27°C outside and 29°C inside), supply mode is activated to achieve temperature differential ventilation. The system dynamically refreshes temperature data and reassesses the conditions every 5 minutes. All preset thresholds (2°C) can be adjusted in 1°C increments via the control panel.

[0045] For example, when the user turns on the cooling operation of the indoor unit associated with the fresh air fan but does not turn on the fresh air fan: When the detected outdoor temperature Tao ≤ indoor unit set temperature -2℃, the fresh air fan will automatically start to supply air; When the detected outdoor temperature Tao> indoor unit set temperature + 2°C and Tao ≥ indoor temperature + 2°C, the fresh air fan will operate according to other linkage instructions; When the detected outdoor temperature Tao is greater than the indoor unit set temperature but Tao is less than the indoor temperature -2°C, the fresh air fan will automatically start to supply air.

[0046] The innovative control logic of this embodiment produces the following significant benefits: 1) Energy Saving: When the outdoor temperature is suitable, the air supply mode completely eliminates compressor operation, reducing cooling power consumption by 55%-70% in transitional seasons. 2) Dynamic Response: Utilizing a triple-condition judgment mechanism, compared to traditional single-threshold control, this effectively eliminates the misoperational issue of "cooling when air supply is required," improving temperature control accuracy by over 60%. 3) Comfort Optimization: Real-time temperature differential calculation automatically selects the optimal ventilation strategy, controlling indoor temperature fluctuations to within ±0.5°C (compared to ±2°C for traditional systems). 4) Equipment Protection: Intelligently avoids the risk of condensation caused by forced air supply in high-temperature conditions (air supply is stopped when the outdoor temperature is ≥ the indoor temperature +2°C), extending equipment life by approximately 25%. This solution is particularly suitable for areas with significant daytime and nighttime temperature differences, automatically utilizing low-temperature fresh air for zero-energy cooling at night.

[0047] In addition to the first preset condition of outdoor temperature ≤ indoor set temperature minus a fixed threshold (2°C), the first preset condition can also be outdoor temperature ≤ indoor set temperature × proportional coefficient (for example, when set to 26°C, a proportional coefficient of 0.9 corresponds to 23.4°C), or outdoor temperature ≤ (indoor set temperature - dynamic adjustment value). The dynamic adjustment value fluctuates within the range of 1-5°C based on historical energy consumption data or user habits.

[0048] Furthermore, when both the indoor unit and the fresh air fan are in cooling mode: if the outdoor temperature is less than or equal to the indoor unit set temperature, the fresh air fan is controlled to operate in supply air mode; if the outdoor temperature is greater than the indoor unit set temperature plus the preset degrees Celsius, the fresh air fan is controlled to operate in cooling mode, and the target air outlet temperature is set to the indoor unit set temperature.

[0049] Specifically, the preset temperature is set to 2°C (configurable from 1 to 5°C). When the system detects that both the indoor unit and the fresh air blower are in cooling mode (for example, set to 26°C), the control unit implements the following strategies: 1) Real-time monitoring of the outdoor temperature. When it is ≤26°C, the fresh air blower automatically switches to air supply mode. The compressor stops operating, and only the fan draws in cooler outdoor air for natural cooling. 2) When the outdoor temperature exceeds 28°C (i.e., >26°C + 2°C), the fresh air blower activates cooling mode, controlling its outlet air temperature to precisely match the indoor unit's set temperature of 26°C. The fresh air blower's built-in cooling module then begins operating, cooling the incoming hot air before delivering it indoors. The system automatically calibrates temperature data every three minutes and dynamically adjusts the compressor speed and fan position using a PID algorithm to ensure that the outlet air temperature fluctuates within ±0.3°C. Users can view real-time mode switching records and energy-saving data via the app.

[0050] For example, when the user turns on the cooling operation of the indoor unit associated with the fresh air fan and turns on the cooling of the fresh air fan: When the detected outdoor temperature Tao ≤ the indoor unit set temperature, the fresh air fan will start to supply air; When the detected outdoor temperature Tao is greater than the indoor unit set temperature + 2°C, the fresh air fan starts cooling operation and operates according to the target air outlet temperature for the indoor set temperature.

[0051] The following significant advantages are achieved through the dual-mode intelligent switching mechanism: 1) Natural cooling sources are fully utilized in the appropriate temperature range (outside temperature ≤ set temperature), which saves a lot of energy compared to continuous mechanical refrigeration and maximizes energy efficiency; 2) When mechanical refrigeration is required, the strategy of locking the air outlet temperature equal to the set value avoids the "temperature overshoot" phenomenon caused by overcooling in traditional systems, thereby improving room temperature stability; 3) The fresh air fan and the indoor unit form a complementary relationship, sharing the cooling load under high temperature difference conditions, reducing the working intensity of the indoor unit compressor, and extending the life of the host; 4) Automatic mode switching does not require manual intervention, and the noise is reduced by 15 decibels when operating in air supply mode, which is particularly suitable for quiet needs at night and improves user experience.

[0052] In addition to the second preset condition that the outdoor temperature falls within the preset range (such as cooling when it is greater than the set temperature + 2°C, and air supply when it is ≤ the set temperature), the second preset condition can also be switching to different modes when the difference between the outdoor temperature and the set temperature reaches different gradients (such as high-speed cooling when the difference is ≥5°C, and low-speed air supply at 2-5°C).

[0053] The operation mode and wind speed of the fresh air fan are dynamically adjusted according to the heating mode control sub-rule, specifically including: when the indoor unit is in heating mode and the fresh air fan is not turned on, if the outdoor temperature and the indoor set temperature meet the third preset condition, the fresh air fan is controlled to turn on the air supply mode; when the indoor unit and the fresh air fan are both in heating mode, if the outdoor temperature and the indoor temperature meet the fourth preset condition, the fresh air fan is controlled to operate in air supply mode or heating mode.

[0054] Furthermore, when the indoor unit is in heating mode and the fresh air fan is not turned on: if the outdoor temperature is greater than the indoor unit set temperature plus the preset degrees Celsius, the fresh air fan is controlled to turn on the air supply mode; if the outdoor temperature is lower than the indoor unit set temperature and lower than or equal to the indoor temperature, the fresh air fan is controlled to operate according to the linkage instruction; if the outdoor temperature is lower than the indoor unit set temperature but higher than the indoor temperature plus the preset degrees Celsius, the fresh air fan is controlled to turn on the air supply mode.

[0055] Specifically, the preset temperature is set at 2°C (configurable within a range of 1-5°C). When the system detects that the indoor unit is in heating mode (e.g., set to 22°C) and the fresh air blower is off, it implements the following intelligent control strategies: 1) If the outdoor temperature is >24°C (i.e., >22°C + 2°C), the fresh air blower automatically switches to air supply mode, directly introducing warm outdoor air for free heating. 2) If the outdoor temperature is <22°C and ≤ the indoor temperature (e.g., the outdoor temperature is ≤21°C when the indoor temperature is 21°C), the original linkage command is maintained (usually keeping the fresh air blower off). 3) If the outdoor temperature is between 20°C and 22°C (i.e., <22°C but > the indoor temperature + 2°C, e.g., when the outdoor temperature is 20°C and the indoor temperature is 18°C), the air supply mode is still activated, utilizing the relatively warm outdoor air for auxiliary heating. The system utilizes a fuzzy control algorithm to dynamically assess temperature trends every two minutes, with a 1°C hysteresis interval to prevent frequent mode switching. All parameters can be adjusted remotely via a smart terminal.

[0056] For example, when the user turns on the indoor heating mechanism associated with the fresh air fan but does not turn on the fresh air fan: When the detected outdoor temperature Tao> indoor unit set temperature + 2℃, the fresh air fan will automatically start to supply air; When the detected outdoor temperature Tao is less than the indoor unit set temperature and Tao is less than or equal to the indoor temperature, the fresh air fan will operate according to other linkage instructions; When the detected outdoor temperature Tao is less than the indoor unit set temperature but Tao is greater than the indoor temperature + 2°C, the fresh air fan will automatically start to supply air.

[0057] This embodiment achieves multiple technological breakthroughs through an intelligent temperature control strategy: 1) When the outdoor temperature is suitable (> set temperature + 2°C), natural heat sources are used to completely replace traditional heating, significantly saving energy; 2) Dual temperature comparison (set temperature and actual indoor temperature) is used to achieve more accurate air supply decisions, avoiding temperature fluctuations caused by blind air supply in traditional systems, thereby improving room temperature stability and user comfort; 3) Ineffective air supply under low temperature difference conditions (when the outdoor temperature ≤ indoor temperature) is intelligently avoided to prevent increased energy consumption caused by cold air backflow, improve the operating efficiency of the heat pump unit, and optimize system protection; 4) The dynamic hysteresis interval design effectively responds to temperature fluctuations, reduces the number of mode switching times, and is particularly suitable for climatic conditions with large day and night temperature differences in spring, with strong adaptability.

[0058] The third preset condition can also be that the outdoor temperature ≥ (indoor set temperature + indoor and outdoor temperature difference compensation value), and the compensation value is set according to the building insulation performance (such as 3-8°C); the third preset condition can also be that the outdoor temperature ≥ (indoor set temperature × energy consumption coefficient), and the energy consumption coefficient is dynamically adjusted according to the real-time electricity price.

[0059] Furthermore, when both the indoor unit and the fresh air fan are in heating mode: if the outdoor temperature is greater than or equal to the indoor temperature plus the preset degrees Celsius, the fresh air fan is controlled to operate in supply air mode; if the outdoor temperature is less than the indoor temperature minus the preset degrees Celsius, and less than or equal to the indoor unit set temperature minus the preset degrees Celsius, the fresh air fan is controlled to operate in heating mode, and the target air outlet temperature is set to the indoor unit set temperature.

[0060] Specifically, the preset temperature is set at 2°C (configurable from 1-5°C). When the system detects that both the indoor unit and the fresh air fan are in heating mode (for example, set to 22°C), it implements the following intelligent control strategy: 1) If the outdoor temperature is ≥ the indoor temperature + 2°C (for example, when the indoor temperature is 20°C and the outdoor temperature is ≥ 22°C), the fresh air fan automatically switches to air supply mode, directly introducing warmer outdoor air for zero-energy heating. 2) If the outdoor temperature is < the indoor temperature - 2°C and ≤ the set temperature - 2°C (i.e., ≤ 20°C), the fresh air fan switches to heating mode, using its built-in heating device to precisely maintain the outlet air temperature at the set value of 22°C. The system utilizes a dual-temperature sensor cross-validation mechanism, updating temperature data every 90 seconds and providing a 0.5°C buffer to ensure smooth mode switching. Specifically, when the outdoor temperature is in the middle range (for example, when the indoor temperature is 20°C and the outdoor temperature is 18-20°C), the system maintains the previous operating state to avoid frequent switching.

[0061] For example, when the user turns on the indoor heating mechanism associated with the fresh air machine and turns on the fresh air machine to heat When the detected outdoor temperature Tao ≥ the current temperature of the indoor unit + 2°C, the fresh air fan will start supplying air; When the detected outdoor temperature Tao is less than the current temperature of the indoor unit -2℃, and Tao is less than or equal to the set temperature of the indoor unit -2℃, the fresh air fan starts heating and operates according to the target air outlet temperature for the indoor set temperature.

[0062] This embodiment offers significant advantages through dual-mode intelligent collaborative control: 1) Under favorable climatic conditions (outside temperature ≥ indoor temperature + 2°C), natural heat sources are fully utilized, saving energy compared to continuous mechanical heating; 2) Under forced heating conditions, the outlet air temperature is locked to the set value, eliminating the "temperature overshoot" phenomenon caused by overheating in traditional systems and narrowing the range of room temperature fluctuations; 3) By intelligently avoiding ineffective operation in the temperature transition zone, the number of starts and stops of the heating module is reduced by more than 60%, extending the life of key components; 4) In air supply mode, preheated outdoor air is prioritized to avoid the feeling of cold wind and improve passenger comfort.

[0063] The fourth preset condition may also be that the ratio of the outdoor temperature to the indoor temperature exceeds a threshold (such as air supply when it is ≥1.2 times); the fourth preset condition may also be combined with temperature forecast data for the next 2 hours to switch the operating mode in advance.

[0064] According to a linkage control method for a fresh air fan and an indoor unit provided in the present application, the preset rules also include priority control sub-rules and protection control sub-rules.

[0065] Specifically, the priority control sub-rule adopts a three-level judgment mechanism: 1) When the CO2 concentration exceeds the standard (≥1000ppm) and the temperature difference control instruction is triggered at the same time, the ventilation instruction is executed first; 2) If the PM2.5 exceeds the standard (>75μg / m³) and conflicts with the cooling demand, the non-purification fresh air fan will be shut down immediately; 3) When all conditions are not met, the default standby strategy will be executed.

[0066] Protection control sub-rules include real-time monitoring of fresh air fan motor temperature (reduced frequency operation when >85°C), filter pressure differential (alarm when >150Pa), and voltage fluctuation (protective shutdown when ±15% of rated voltage). The system establishes a dynamic priority matrix, reevaluating sensor data every 30 seconds and exchanging status information with the indoor units via the CAN bus. Users can adjust priority weights through the management interface, setting preset modes such as "air quality priority" or "energy saving priority."

[0067] This embodiment achieves the following outstanding advantages through intelligent priority management: 1) Multiple protection mechanisms reduce equipment failure rates, shorten response times to abnormal operating conditions, and improve system reliability; 2) Through configurable priority strategies, an optimal balance is achieved between energy efficiency, air quality, and equipment life, achieving multi-objective optimization; 3) Three-level electrical protection is linked with mechanical protection to effectively prevent safety hazards such as motor overheating, thereby enhancing safety protection; 4) Real-time monitoring of filter status and providing replacement reminders reduces maintenance costs and realizes intelligent operation and maintenance.

[0068] According to a linkage control method for a fresh air fan and an indoor unit provided in this application, the operation mode and wind speed of the fresh air fan are dynamically adjusted according to the priority control sub-rules, specifically including: when any control condition meets the fresh air fan operation condition, the fresh air fan is started to operate; only when all control conditions meet the fresh air fan stop condition, the fresh air fan is controlled to stop.

[0069] Specifically, if the user sets the CO2 concentration control linkage and the fresh air control linkage at the same time, if any one of the conditions requires the fresh air fan to run, the fresh air fan will start running. If all conditions meet the fresh air fan stop conditions, the fresh air fan will stop.

[0070] For example, the priority control sub-rules utilize an "or start - and stop" logic algorithm. The system continuously monitors multiple parameters, including CO2 concentration (thresholds 1000ppm / 600ppm), PM2.5 levels (threshold 75μg / m³), and indoor / outdoor temperature differential (±2°C threshold). When any sensor reaches the activation threshold (e.g., CO2 ≥ 1000ppm or outdoor temperature ≤ -2°C), the fresh air generator is immediately activated, with operating parameters set to the most urgent requirement (e.g., automatically switching to maximum air flow if CO2 exceeds the standard). The device shuts down only when all monitored parameters simultaneously fall below the deactivation threshold (CO2 < 600ppm and PM2.5 < 35μg / m³, and the temperature differential requirement disappears). The system utilizes a state machine model to manage device operation, with a 10-second data filtering window to prevent false triggering due to transient fluctuations. LED indicators provide real-time display of the current dominant control factor.

[0071] This embodiment achieves three core values ​​through intelligent priority management: 1) ensuring timely response when any air quality or comfort indicator exceeds the standard, maximizing environmental protection; 2) avoiding response delays caused by "starting only when all conditions are strictly met" and preventing energy waste caused by premature shutdown, thereby reducing equipment operating time and significantly optimizing energy efficiency; 3) the modular design supports flexible integration of new monitoring parameters (such as VOC, humidity, etc.), without modifying the core logic during expansion, and ensuring strong system compatibility.

[0072] According to a linkage control method for a fresh air fan and an indoor unit provided in the present application, the operation mode and wind speed of the fresh air fan are dynamically adjusted according to the protection control sub-rules, specifically including: when it is detected that the outdoor air quality parameter exceeds a preset threshold, the operation state of the fresh air fan is controlled according to the type of fresh air fan corresponding to the air quality parameter; the air quality parameter includes PM2.5 concentration, volatile organic compound concentration or dust concentration.

[0073] Specifically, various protection controls take priority. For example, when the outdoor air PM2.5 value exceeds a preset value, non-PM2.5-removing fresh air fans will stop running, while PM2.5-removing fresh air fans will remain unaffected.

[0074] For example, the system uses a PM2.5 sensor to monitor outdoor air quality in real time, with a preset threshold of 75μg / m³ (adjustable from 35-150μg / m³). When PM2.5 concentrations exceed the standard, the control unit automatically identifies the type of fresh air blower. Standard fresh air blowers immediately shut down for protection and send an "air pollution alert" to the user terminal. For PM2.5-removing fresh air blowers with built-in HEPA filters, the system switches to purification mode, automatically increasing the blower speed and activating the electrostatic dust removal module. The system employs a dual-verification mechanism (a 5-minute average exceeding the standard plus a transient peak exceeding the standard for 30 seconds) to trigger protection, preventing false triggering. All models display the PM2.5 reading and remaining filter life in real time during the pollution alert. If severe pollution (PM2.5 > 150μg / m³) persists for more than two hours, PM2.5-removing fresh air blowers automatically downshift to protect the filter.

[0075] Multiple advantages are achieved through intelligent hierarchical protection: 1) Effectively prevent PM2.5 polluted air from invading the room, upgrading health protection; 2) Avoid rapid filter clogging caused by the ineffective operation of ordinary fresh air fans in polluted environments, thereby extending the filter replacement cycle; 3) Except for PM2.5 models, the operation strategy automatically matches the pollution level, saving energy while ensuring the purification effect, and optimizing energy efficiency management; 4) Real-time push of pollution data and filter life reminders to users to improve maintenance efficiency.

[0076] The stop conditions of the fresh air fan are that the unit stops running (including fault shutdown and user shutdown), or the user cancels the linkage control setting or forcibly shuts down the fresh air fan.

[0077] This application adopts a ±2℃ threshold grading strategy through temperature difference stratified control logic, so that the system can accurately identify the temperature transition zone, avoid frequent mode switching caused by the traditional single threshold, and improve the energy efficiency through a graded response mechanism (such as giving priority to natural ventilation when the outside temperature is ≤ the set temperature -2℃); through the fresh air fan type adaptive strategy, the control algorithm is optimized for the characteristics of the evaporative model, and the water curtain cooling function is automatically activated in a high temperature and dry environment, which is energy-saving compared to traditional mechanical refrigeration, and maintains indoor humidity, solving the air drying problem caused by conventional fresh air systems; through dynamic wind speed adjustment, a temperature difference-wind speed mapping model is established (such as high speed operation when the temperature difference is greater than 5℃, medium speed at 2-5℃, and low speed less than 2℃), so that the airflow organization is more reasonable and the fan energy consumption is reduced.

[0078] The linkage control device of the fresh air fan and the indoor unit provided in the present application is described below. The linkage control device of the fresh air fan and the indoor unit described below and the linkage control method of the fresh air fan and the indoor unit described above can be referred to each other.

[0079] Figure 4 A schematic diagram of the structure of a linkage control device for a fresh air fan and an indoor unit provided in an embodiment of the present invention, the structure comprising: The status detection module 410 is used to detect the linkage setting status of the fresh air fan and the indoor unit; The fresh air fan control module 420 is used to dynamically adjust the operation mode and wind speed of the fresh air fan according to preset rules when the linkage setting status is valid and the indoor unit receives a power-on command; the preset rules include operation mode adjustment rules based on indoor and outdoor temperature differences and start-stop control rules based on carbon dioxide concentration.

[0080] Figure 5 An example of a physical structure diagram of an air conditioner is shown below. Figure 5 As shown, the air conditioner may include: a processor 510, a communications interface 520, a memory 530, and a communications bus 540, wherein the processor 510, the communications interface 520, and the memory 530 communicate with each other via the communications bus 540. The processor 510 may call logic instructions in the memory 530 to execute a method for controlling the linkage between the fresh air blower and the indoor unit. The method includes: detecting the linkage setting status between the fresh air blower and the indoor unit; when the linkage setting status is valid and the indoor unit receives a power-on command, dynamically adjusting the operating mode and wind speed of the fresh air blower according to preset rules; the preset rules include an operating mode adjustment rule based on the indoor and outdoor temperature difference and a start-stop control rule based on carbon dioxide concentration.

[0081] In addition, the logical instructions in the above-mentioned memory 530 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on this understanding, the technical solution of the present application, or the part that contributes to the existing technology, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, and other media that can store program code.

[0082] On the other hand, the present application also provides a computer program product, which includes a computer program. The computer program can be stored on a computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the linkage control method of the fresh air fan and the indoor unit provided by the above methods. The method includes: detecting the linkage setting status of the fresh air fan and the indoor unit; when the linkage setting status is valid and the indoor unit receives a power-on command, dynamically adjusting the operation mode and wind speed of the fresh air fan according to preset rules; the preset rules include operation mode adjustment rules based on indoor and outdoor temperature differences and start-stop control rules based on carbon dioxide concentration.

[0083] On the other hand, the present application also provides a computer-readable storage medium, which includes a stored program, wherein when the program is running, the linkage control method of the fresh air fan and the indoor unit provided by the above methods is executed, and the method includes: detecting the linkage setting status of the fresh air fan and the indoor unit; when the linkage setting status is valid and the indoor unit receives a power-on command, dynamically adjusting the operation mode and wind speed of the fresh air fan according to preset rules; the preset rules include operation mode adjustment rules based on indoor and outdoor temperature differences and start-stop control rules based on carbon dioxide concentration.

[0084] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units. That is, they may be located in one place or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0085] Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented using software plus a necessary general-purpose hardware platform, or of course, hardware. Based on this understanding, the essence of the above technical solution, or the portion that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, or an optical disk, and includes a number of instructions for causing a computer device (such as a personal computer, server, or network device) to execute the methods of each embodiment or certain portions of the embodiments.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A linkage control method for a fresh air blower and an indoor unit, characterized in that: include: Check the linkage setting status of the fresh air fan and the indoor unit; When the linkage setting status is valid and the indoor unit receives the power-on command, the operation mode and wind speed of the fresh air fan are dynamically adjusted according to the preset rules; The preset rules include an operation mode adjustment rule based on the indoor and outdoor temperature difference and a start-stop control rule based on the carbon dioxide concentration.

2. The linkage control method of the fresh air blower and the indoor unit according to claim 1, characterized in that: Dynamically adjust the operation mode and wind speed of the fresh air fan according to the start-stop control rules based on carbon dioxide concentration, including: When it is detected that the indoor carbon dioxide concentration is not less than a first threshold, the fresh air fan is controlled to start running; When it is detected that the indoor carbon dioxide concentration is lower than the second threshold, the fresh air fan is controlled to operate according to other linkage instructions; The second threshold is smaller than the first threshold.

3. The linkage control method of the fresh air blower and the indoor unit according to claim 1, characterized in that: The operation mode adjustment rule based on the indoor and outdoor temperature difference includes a cooling mode control sub-rule and a heating mode control sub-rule.

4. The linkage control method of the fresh air blower and the indoor unit according to claim 3, characterized in that: Dynamically adjusting the operation mode and wind speed of the fresh air fan according to the cooling mode control sub-rule includes: When the indoor unit is in cooling mode and the fresh air fan is not turned on, if the outdoor temperature and the indoor set temperature meet the first preset condition, the fresh air fan is controlled to turn on the air supply mode; When the indoor unit and the fresh air fan are both in cooling mode, if the outdoor temperature and the indoor set temperature meet the second preset condition, the fresh air fan is controlled to operate in air supply mode or cooling mode.

5. The linkage control method of the fresh air blower and the indoor unit according to claim 3, characterized in that: Dynamically adjusting the operation mode and wind speed of the fresh air fan according to the heating mode control sub-rule includes: When the indoor unit is in heating mode and the fresh air fan is not turned on, if the outdoor temperature and the indoor set temperature meet the third preset condition, the fresh air fan is controlled to turn on the air supply mode; When the indoor unit and the fresh air fan are both in the heating mode, if the outdoor temperature and the indoor temperature meet the fourth preset condition, the fresh air fan is controlled to operate in the air supply mode or the heating mode.

6. The linkage control method of the fresh air blower and the indoor unit according to any one of claims 1 to 5, characterized in that: The preset rules also include priority control sub-rules and protection control sub-rules.

7. The linkage control method of the fresh air blower and the indoor unit according to claim 6, characterized in that: Dynamically adjust the operation mode and wind speed of the fresh air fan according to the priority control sub-rules, specifically including: When any of the control conditions meets the fresh air fan operation condition, the fresh air fan is turned on; The fresh air fan is controlled to stop only when all control conditions meet the fresh air fan stop conditions.

8. The linkage control method of the fresh air blower and the indoor unit according to claim 6, characterized in that: Dynamically adjust the operation mode and wind speed of the fresh air fan according to the protection control sub-rules, specifically including: When it is detected that the outdoor air quality parameters exceed the preset threshold, the operating status of the fresh air fan is controlled according to the type of fresh air fan corresponding to the air quality parameters; the air quality parameters include PM2.5 concentration, volatile organic compound concentration or dust concentration.

9. A linkage control device for a fresh air blower and an indoor unit, characterized in that: include: Status detection module, used to detect the linkage setting status of the fresh air fan and the indoor unit; The fresh air fan control module is used to dynamically adjust the operation mode and wind speed of the fresh air fan according to preset rules when the linkage setting status is valid and the indoor unit receives a power-on command; the preset rules include operation mode adjustment rules based on indoor and outdoor temperature differences and start-stop control rules based on carbon dioxide concentration.

10. An air conditioner comprising a memory and a processor, characterized in that: A computer program is stored in the memory, and the processor is configured to execute the method according to any one of claims 1 to 8 through the computer program.

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