Air handling equipment cooperative control method, device and system for shared air supply pipeline

Abstract

The application relates to the technical field of air conditioning and automatic control, and provides an air handling equipment cooperative control method, device and system of a shared air supply pipeline, which comprises the following steps: acquiring field calibration air volume of a first air handling equipment under multiple preset operating gears; acquiring real-time operating state parameters of the first air handling equipment; determining a current matching gear from the multiple preset operating gears based on the real-time operating state parameters; determining a target air supply output of a second air handling equipment based on the field calibration air volume corresponding to the current matching gear; and controlling an air supply power source of the second air handling equipment based on the target air supply output. The application realizes accurate cooperation of multiple air handling equipments under the shared air supply pipeline through field calibration and dynamic matching, effectively adapts to pipeline resistance differences, and improves operating stability.

Description

Technical Field

[0001] This application relates to the field of air conditioning and automatic control technology, and in particular to a collaborative control method, device and system for air handling equipment with a shared air supply duct. Background Technology

[0002] In air conditioning systems with independent temperature and humidity control, a common architecture for fresh air handling units and all-air handling units to adapt to space constraints in residential and other buildings is the sharing of air supply ducts. However, in this architecture, the power sources for the air supply of both units act on the same air supply channel, resulting in a fluid dynamic coupling effect. Existing technologies typically rely on factory-preset parameters or simple start-stop linkages for control, which struggle to accurately reflect the actual duct network resistance characteristics caused by variations in duct length, number of bends, vent type, and construction quality at specific building sites. This leads to problems such as airflow mismatch, deviations from design values ​​in air supply volume, increased terminal noise, or operational instability during joint operation. This is especially problematic in variable air volume (VAV) conditions or low-noise scenarios, where fixed settings or simple voltage linkages cannot achieve precise dynamic adaptation. Summary of the Invention

[0003] To address the problems of airflow coupling interference and poor adaptability to on-site pipeline resistance in existing technologies involving multiple air handling units with shared air supply ducts, this application proposes a collaborative control method, device, and system for air handling units with shared air supply ducts, achieving dynamic collaborative control based on on-site measured calibration and real-time status matching.

[0004] To achieve the above objectives, this application adopts the following technical solution: A collaborative control method for air handling units sharing a common air supply duct is provided for scenarios where a first air handling unit and a second air handling unit share a common air supply duct. The method includes: acquiring the on-site calibrated air volume of the first air handling unit under multiple preset operating levels; acquiring the real-time operating status parameters of the first air handling unit; determining the current matching level from the multiple preset operating levels based on the real-time operating status parameters; determining the target air supply output of the second air handling unit based on the on-site calibrated air volume corresponding to the current matching level; and controlling the air supply power source of the second air handling unit based on the target air supply output.

[0005] The above solution replaces the traditional factory-preset parameters by introducing on-site calibrated air volume as the control benchmark, enabling the control logic to truly reflect the actual pipeline resistance characteristics of the building site. At the same time, by dynamically matching the current gear with real-time operating status parameters and adjusting the output of the slave device (second air handling unit) accordingly, a dynamic collaborative relationship between the master and slave devices under the shared pipeline is established, effectively solving the air volume mismatch problem caused by the coupling of multiple power sources (multiple air handling units).

[0006] As one implementation method, the current matching gear is determined from multiple preset operating gears based on real-time operating status parameters, including: calculating the state difference between the real-time operating status parameters and the preset status parameters corresponding to each preset operating gear; selecting the preset operating gear corresponding to the minimum state difference as a candidate gear; and determining the candidate gear as the current matching gear in response to the minimum state difference being within a preset allowable range.

[0007] This implementation method reliably maps continuous or discrete real-time physical quantities to logical gear positions by using difference comparison and threshold judgment. This not only ensures the accuracy of gear position recognition, but also avoids misjudgment caused by signal fluctuations or sampling errors by setting a preset allowable range, thereby improving the system's anti-interference capability.

[0008] As one implementation method, the real-time operating status parameter is the current output voltage of the air supply power source of the first air handling equipment; the preset status parameter is the preset output voltage corresponding to each preset operating level; and the preset allowable range is a fixed threshold determined based on the analog-to-digital conversion sampling resolution and the voltage interval between adjacent preset operating levels.

[0009] This implementation further clarifies the physical basis of state matching, using voltage as a direct parameter characterizing the fan state, and combining hardware sampling characteristics to set a scientific tolerance threshold, ensuring the robustness and consistency of gear determination under different electrical characteristics.

[0010] As one implementation method, determining the target air supply output of the second air handling unit based on the on-site calibrated air volume corresponding to the current matching gear includes: calculating the target air supply output based on the on-site calibrated air volume corresponding to the current matching gear through a preset mapping relationship; in response to a change in the current matching gear of the first air handling unit, re-executing the step of determining the current matching gear from multiple preset operating gears based on real-time operating status parameters, and recalculating the target air supply output based on the on-site calibrated air volume corresponding to the changed current matching gear.

[0011] This implementation establishes a quantitative mapping between air volume and output, and introduces a dynamic recalculation mechanism, so that when the operating conditions of the master equipment (first air handling unit) are switched, the slave equipment (second air handling unit) can adjust in real time, ensuring that the synthetic air volume in the shared pipeline is always in a stable and controlled state throughout the entire operating range, especially during variable air volume processes.

[0012] As one implementation method, the on-site calibrated air volume is the total air supply volume obtained based on the actual pipeline resistance measurement under multiple preset operating levels.

[0013] This implementation method clarifies the physical properties of the calibration data, emphasizing that it originates from actual measurements of the installation environment rather than theoretical calculations, thereby fundamentally eliminating the impact of individual building differences on control accuracy.

[0014] As one implementation method, the multiple preset operating levels include at least high, medium, low and sleep modes; the total air volume obtained based on the actual pipeline resistance measurement includes: measuring the total air volume of each air outlet using an air volume hood; or, measuring and converting the total air volume based on the cross-sectional wind speed of the air supply pipeline.

[0015] This implementation method covers the main operating modes commonly used by users and provides flexible and feasible on-site measurement methods, ensuring that the calibration data can fully characterize the key performance nodes of the system in actual use.

[0016] In one implementation, the method further includes: in response to the second air handling unit operating independently, outputting a preset minimum sustaining voltage to the air supply power source of the first air handling unit to establish an unobstructed airflow path through the interior of the first air handling unit and the shared air supply duct; and in response to detecting missing airflow parameters, invalid gear matching, equipment failure, or configuration conflict, stopping the execution of the step of controlling the air supply power source of the second air handling unit based on the target air supply output.

[0017] This implementation improves the system's boundary handling logic under special operating conditions, preventing equipment damage or performance degradation caused by channel blockage when the second air handling unit operates alone, and ensuring the safety and reliability of the system operation by promptly exiting collaborative takeover in abnormal conditions.

[0018] In one implementation, the air supply power source of the second air handling unit is a DC brushless motor; controlling the air supply power source of the second air handling unit based on the target air supply output includes: adjusting the drive voltage of the DC brushless motor to make the air supply power source of the second air handling unit operate according to the target air supply output.

[0019] This implementation method is adapted to the linear speed regulation characteristics of DC brushless motors, and uses voltage regulation to achieve precise control of air volume, thereby enhancing the feasibility of the technical solution on specific hardware platforms.

[0020] In one implementation, the first air handling unit selects a control combination based on indoor load demand in the combined operation mode. The control combination includes at least constant air volume variable water temperature control, variable air volume constant water temperature control, and variable air volume variable water temperature control. For any of the control combinations: if the first air handling unit maintains the current matching level and adjusts the water supply temperature, the target air supply output of the second air handling unit is maintained at the value corresponding to the current matching level. If the current matching level of the first air handling unit changes, the step of determining the current matching level from the plurality of preset operating levels based on the real-time operating status parameters is re-executed, and the target air supply output is recalculated based on the on-site calibrated air volume corresponding to the changed current matching level.

[0021] This implementation method addresses the combined adjustment characteristics of the first air handling unit in terms of both air volume and water supply temperature. It establishes corresponding control logic between the control combination and the output of the second air handling unit, so that when the first air handling unit only adjusts the water supply temperature without changing the air volume, the second air handling unit can maintain a stable output without rematching. When the air volume level changes, rematching and recalculation are triggered immediately, thus taking into account both the stability and dynamic response capability of the collaborative control.

[0022] In addition, this application also provides a collaborative control device for air handling equipment with a shared air supply duct, including a processor and a memory. The memory stores a computer program, and when the processor executes the computer program, it implements the collaborative control method for air handling equipment with a shared air supply duct as described above.

[0023] As the hardware carrier for implementing the method, this device can flexibly realize the aforementioned complex collaborative control logic through software programming, making it easy to integrate into existing air conditioning control systems and improving the product's intelligence level and control precision.

[0024] In addition, this application also provides an air handling system with a shared air supply duct, including a first air handling unit, a second air handling unit, a shared air supply duct connecting the first air handling unit and the second air handling unit, and a collaborative control device as described above; the air supply outlet of the first air handling unit is connected to the shared air supply duct, and the air outlet of the second air handling unit is connected to the fresh air inlet of the first air handling unit.

[0025] Beneficial effects:

[0026] The technical solution provided in this application acquires the on-site calibrated air volume of the first air handling unit at multiple preset operating levels, transforming the actual pipeline resistance characteristics of the building site into a control benchmark. This overcomes the shortcomings of traditional factory-preset parameters that cannot adapt to individual installation differences, ensuring the accuracy of air volume control from the source. Based on this, by real-time monitoring of the operating status parameters of the first air handling unit and dynamically matching the current level, and then calculating and adjusting the target air output of the second air handling unit in real time according to the on-site calibrated air volume corresponding to that level, a dynamic collaborative mechanism between master and slave devices based on real-world operating condition feedback is established. This mechanism effectively decouples the fluid interference from multiple power sources (multiple air handling units) in a shared air supply duct, avoiding noise increases or operational oscillations caused by air volume mismatch. Especially in scenarios with variable air volume and low noise requirements, it can achieve precise follow-up and smooth transition of air volume. Simultaneously, with a comprehensive abnormal state handling and single-operation (second air handling unit operating independently) airflow maintenance strategy, the robustness and safety of the system in complex engineering environments are significantly improved, providing reliable technical support for the large-scale application of independent temperature and humidity control systems in confined spaces such as residential buildings. Attached Figure Description

[0027] The preferred embodiments will be described below in a clear and easy-to-understand manner, with reference to the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages, and implementation methods of a collaborative control method, device, and system for air handling equipment with a shared air supply duct: Figure 1 This is a schematic diagram of the air handling system structure with a shared air supply duct in an embodiment of this application.

[0028] Explanation of icon numbers: 1. Return air inlet, 2. Supply air outlet, 3. Fresh air dehumidifier, 4. Fresh air dehumidifier outlet, 5. Fresh air inlet of the all-air handling unit. Detailed Implementation

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the specific implementation methods of this application will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without creative effort.

[0030] To keep the drawings concise, each drawing only schematically shows the parts relevant to this application, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0031] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0032] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0034] Example 1:

[0035] like Figure 1 As shown, this embodiment provides a collaborative control method for air handling units sharing a common air supply duct, applied to a scenario where a first air handling unit and a second air handling unit share a common air supply duct. It should be understood that... Figure 1 This diagram only schematically illustrates the logical connections and airflow patterns between the system's components. In practical applications, the specific form, installation location, and piping layout of the equipment can be flexibly adjusted according to the building's site conditions, as long as both units share the same air supply path. This method solves the airflow coupling problem of multiple power sources (multiple air handling units) under shared piping by establishing a dynamic master-slave device collaboration mechanism based on on-site measured data. Specifically, this method includes the following steps.

[0036] Step S100: Obtain the on-site calibrated air volume of the first air handling unit at multiple preset operating levels. Specifically, the on-site calibrated air volume refers to the total air volume actually measured when the first air handling unit operates at each preset operating level, taking into account the duct network resistance characteristics of a specific building site after system installation. This parameter is fundamentally different from the rated air volume measured on a standard test bench when the equipment leaves the factory. It truly reflects the actual flow resistance characteristics formed by factors such as duct length, number of bends, air outlet type, and dust accumulation on the filter screen under the current installation environment. By using the on-site calibrated air volume as the control benchmark, theoretical calculation deviations caused by individual building differences can be eliminated from the source, ensuring that the air volume data used for subsequent collaborative control has true physical meaning. It should be noted that the number of preset operating levels is not limited to a specific number; it should at least cover the main operating conditions that may be involved in the joint operation of the system in order to build a complete air volume-level correspondence library.

[0037] Step S200: Obtain the real-time operating status parameters of the first air handling unit. Specifically, the real-time operating status parameters refer to continuous or discrete physical quantities that characterize the current operating status of the air supply power source of the first air handling unit. These parameters fluctuate dynamically with changes in equipment load and are a direct basis for judging the current actual operating condition of the equipment. For example, these parameters can be electrical or mechanical parameters such as the input voltage, current, speed feedback signal, or PWM duty cycle of the drive motor. By acquiring this parameter in real time, the control system can sense the instantaneous operating status of the first air handling unit in the shared pipeline, providing real-time data input for subsequent gear matching.

[0038] Step S300: Based on real-time operating status parameters, determine the current matching gear from multiple preset operating gears. Specifically, this step is essentially a process of mapping continuously changing physical quantities to discrete logical gears. Since the status parameters of the first air handling unit may fluctuate slightly around a nominal value due to power grid fluctuations, load changes, or control precision limitations during actual operation, it is not possible to simply compare the real-time parameters with the preset values ​​as absolutely equal. This embodiment uses a preset matching algorithm to find the logical state closest to the real-time operating status parameters among multiple preset operating gears and determines it as the current matching gear. This mapping mechanism enables the control system to accurately identify the operating condition range of the first air handling unit even when it is in a variable air volume transition process or in a non-steady-state operation, ensuring the continuity and stability of the coordinated control.

[0039] Step S400: Based on the on-site calibrated air volume corresponding to the current matching gear, determine the target air supply output of the second air handling unit. Specifically, after determining the current matching gear, the system retrieves the on-site calibrated air volume obtained in step S100 for that gear as a reference value, and calculates the target air supply output that the second air handling unit should achieve through a preset mapping relationship. This mapping relationship reflects the inherent physical law of air volume distribution between master and slave devices in a shared pipeline system. Its purpose is to match the air supply capacity of the second air handling unit with the actual delivery capacity of the first air handling unit under the current operating conditions. Since the air volume reference used for calculation is calibrated through on-site measurement, the resulting target air supply output can accurately adapt to the current pipeline resistance state, effectively avoiding problems such as excessive positive pressure in the pipeline, increased noise, or difficulty in fresh air intake caused by air volume mismatch.

[0040] Step S500 involves controlling the air supply power source of the second air handling unit based on the target air supply output. Specifically, the control system converts the calculated target air supply output into corresponding drive commands, which are then applied to the air supply power source of the second air handling unit, causing it to operate according to the expected airflow or pressure. This control action constitutes the execution end of the collaborative control closed loop, ensuring that the actual output of the second air handling unit can follow the operating condition changes of the first air handling unit in real time. Through the complete control process constituted by the above steps S100 to S500, this embodiment realizes a dynamic follow-up control based on the actual resistance characteristics on site, fundamentally solving the fluid dynamics coupling problem of a dual-fan system in a shared air supply duct scenario, and significantly improving the system's operational stability and energy efficiency while ensuring environmental regulation effects.

[0041] Example 2:

[0042] Building upon Example 1, this example further specifies the concrete implementation method for determining the current matching gear from multiple preset operating gears based on real-time operating status parameters. Specifically, the process includes: calculating the state difference between the real-time operating status parameters and the preset status parameters corresponding to each preset operating gear; selecting the preset operating gear corresponding to the minimum state difference as a candidate gear; and determining the candidate gear as the current matching gear in response to the minimum state difference being within a preset allowable range. Since the control signal of the first air handling unit often exhibits dynamic micro-oscillations due to load fluctuations and sensor quantization errors during actual operation, relying solely on absolute equality for judgment can easily lead to frequent gear recognition jumps or failures. By introducing minimum state difference filtering, the system can lock the most likely operating point; and by verifying the preset allowable range, false matches caused by signal distortion or transition processes are further filtered out, ensuring the robustness and confidence of gear recognition.

[0043] In one specific implementation, the real-time operating status parameter is the current output voltage of the air supply power source of the first air handling unit; the preset status parameter is the preset output voltage corresponding to each preset operating level; the preset allowable range is a fixed threshold determined based on the analog-to-digital conversion sampling resolution and the voltage interval between adjacent preset operating levels. In this embodiment, voltage is chosen as the status characterization quantity because for inductive loads such as fans, there is a strong monotonic mapping relationship between the driving voltage, rotational speed, and airflow, and the voltage signal acquisition circuit is mature, has a fast response speed, and can reflect the output status of the power source in real time. More importantly, the setting of the preset allowable range is not an arbitrary engineering experience value, but a safety boundary scientifically derived based on the underlying hardware characteristics. Specifically, the lower limit of this range is determined by the analog-to-digital conversion (AD) sampling resolution. For example, when the AD resolution is 0.02V, considering quantization noise and reference source drift, the allowable range should cover at least several LSBs (least significant bits) to avoid normal sampling fluctuations being misjudged as gear switching. The upper limit of this range is determined by the voltage interval between adjacent preset operating gears. For example, when the preset voltage interval between high and medium gears is 1.0V, the maximum value of the allowable range must be significantly less than half of this interval (e.g., 0.3V-0.4V) to prevent misidentification of gears when the voltage is in the middle region between the two gears. This fixed threshold determined based on hardware physical characteristics ensures sensitivity to changes in actual operating conditions and builds immunity to electrical noise, effectively solving the technical problem of slave device uncoordinated failure caused by inaccurate identification of master device status in shared piping systems.

[0044] To illustrate the matching mechanism more clearly, a specific operating scenario is used as an example. Assume the first air handling unit has four preset operating levels: high, medium, low, and sleep, with corresponding preset output voltages of 7.6V, 5.8V, 4.0V, and 2.9V, respectively. The controller collects the current output voltage in real time, which is 5.83V. The system first calculates the absolute difference between this real-time voltage and the preset voltage for each level, resulting in a sequence of differences: |5.83-7.6|=1.77V, |5.83-5.8|=0.03V, |5.83-4.0|=1.83V, |5.83-2.9|=2.93V. The minimum difference of 0.03V is selected, and its corresponding candidate level is medium. The system then determines whether this minimum difference of 0.03V falls within the preset allowable range. If the preset allowable range is set to ±0.1V (this value takes into account the AD resolution of 0.02V and the gear interval of approximately 1.0V or more), since 0.03V is less than 0.1V, the matching is deemed valid, and the current matched gear is confirmed to be the medium gear. The corresponding field-calibrated airflow for the medium gear is then retrieved for subsequent collaborative calculations. Conversely, if the real-time acquired voltage is 5.2V, the difference between it and the medium gear's 5.8V is 0.6V, and the difference between it and the low gear's 4.0V is 1.2V. The minimum difference of 0.6V exceeds the preset allowable range of ±0.1V. In this case, the system will determine that it is currently in a gear switching transition zone or an abnormal state, and will not perform gear matching. This avoids outputting incorrect collaborative commands under uncertain conditions, ensuring the safety and stability of system operation.

[0045] Example 3:

[0046] Building upon Examples 1 and 2, this example further defines the specific implementation logic for determining the target air supply output of the second air handling unit based on the on-site calibrated air volume corresponding to the current matching level, as well as the dynamic coordination strategy for responding to changes in the main equipment's operating conditions. Specifically, the target air supply output is calculated based on the on-site calibrated air volume corresponding to the current matching level through a preset mapping relationship. This preset mapping relationship represents the quantitative coupling law between the actual delivery capacity of the first air handling unit and the required output of the second air handling unit in a shared air supply duct scenario. Due to the varying duct resistance characteristics of different building sites, this mapping relationship is not a universal fixed proportional coefficient, but rather a function model with the on-site calibrated air volume as the key variable. In practical implementation, the preset mapping relationship can take various forms: for example, it can be a mathematical formula (such as a quadratic polynomial, power function, etc.) obtained based on field test fitting, which can continuously reflect the nonlinear impact of air volume changes on the output; it can also be a pre-calibrated discrete lookup table relationship, which obtains the result by storing multiple sets of data points corresponding to "field-calibrated air volume - target output" and performing interpolation calculations; it can also be a segmented mapping relationship, which sets differentiated control strategies for different operating conditions such as high, medium, and low settings. Regardless of the form adopted, the core is to convert the air volume benchmark calibrated by field measurement into precise control commands for the second air handling unit, thereby ensuring that the air output of the secondary unit matches the actual flow capacity of the primary unit at any setting, avoiding excessive positive pressure in the pipeline due to excessive output causing whistling, or insufficient fresh air intake and reduced ventilation efficiency due to insufficient output.

[0047] More importantly, to adapt to the dynamic adjustment needs of the first air handling unit under variable air volume conditions, this embodiment introduces a real-time recalculation mechanism. Specifically, in response to a change in the current matching level of the first air handling unit, the step of determining the current matching level from multiple preset operating levels based on real-time operating status parameters is re-executed, and the target air supply output is recalculated based on the on-site calibrated air volume corresponding to the changed current matching level. This dynamic recalculation logic differs from traditional static linkage or delayed following strategies; its essence is the establishment of a high-frequency updated closed-loop control system. In actual operation, the first air handling unit often needs to automatically adjust the air volume according to changes in indoor load (such as in automatic fan speed mode), or the user needs to manually switch the level. When a change in level is detected, it means that the mainstream field characteristics in the shared duct have undergone a step change. At this time, if the second air handling unit still maintains its original output, it will inevitably lead to momentum mismatch between the two airflows at the confluence point, causing air volume fluctuations, sudden noise increases, and even fan surge. By immediately triggering rematching and recalculation, the system can ensure that the target output of the slave device adjusts in real time to follow the new operating point during the transition of the master device's gear shift. This dynamic response capability ensures that the synthetic air volume in the shared air supply duct remains stable throughout the entire variable air volume process, and the proportion of fresh air is maintained within the preset range. This effectively eliminates the risk of environmental comfort degradation caused by control lag and significantly improves the robustness and collaborative quality of the system under complex dynamic operating conditions.

[0048] Example 4:

[0049] Building upon Examples 1 to 3, this embodiment further defines the data attributes of the on-site calibrated air volume and its specific acquisition method. Specifically, the on-site calibrated air volume is the total air supply volume measured based on actual pipeline resistance under multiple preset operating levels. This definition clarifies that the air volume benchmark used in this application is not the rated air volume measured on a standard test bench at the time of equipment delivery, nor is it the design air volume calculated based on theoretical formulas. Rather, it is a physical quantity measured in a real pipeline environment at a specific building site after system installation. Specifically, the rated air volume at the time of equipment delivery is usually measured under idealized standard operating conditions with short straight pipes and no additional resistance components. However, in actual building construction, air supply ducts often include straight pipe sections of varying lengths, multiple bends, reducers, filters, silencers, and various air outlets. These factors collectively constitute complex actual pipeline resistance characteristics. When the first air handling unit operates at a certain level, its actual output air volume will decrease or change due to overcoming these site-specific resistances. Therefore, only the total air supply volume obtained through on-site measurement can truly characterize the actual delivery capacity of the equipment in the current installation environment. Using this measured data based on actual pipeline resistance as the input benchmark for collaborative control can eliminate theoretical calculation deviations caused by individual building differences, construction quality fluctuations, or later modifications at the source. This ensures that the target air supply output of the subsequently determined second air handling equipment has a real physical basis, thereby effectively solving the problem of mismatch between slave equipment and main equipment caused by the discrepancy between the actual air volume of the main equipment and the preset value in the shared pipeline system.

[0050] As a specific implementation method, multiple preset operating levels include at least high, medium, low, and sleep modes. These four levels cover the most typical operating conditions of air handling equipment in residential and similar building scenarios: high corresponds to maximum load or rapid adjustment needs, medium corresponds to normal comfort operation needs, low corresponds to maintenance operation or light load needs, and sleep mode corresponds to nighttime rest scenarios where users are extremely sensitive to noise. By calibrating these four key levels on-site, a complete airflow-level mapping relationship library covering the entire load range can be constructed, ensuring that the system can obtain an accurate collaborative benchmark in any commonly used mode. It should be understood that "at least includes" means that the number of preset operating levels is not limited to this. In practical applications, if the first air handling equipment has other functional levels (such as high-power, energy-saving, ventilation, etc.), these should also be included in the on-site calibration scope to ensure that the collaborative control logic has data support in all possible operating states.

[0051] Regarding the specific implementation methods for obtaining the total air volume based on actual pipeline resistance measurement, this embodiment provides two parallel measurement methods to adapt to different on-site installation conditions and testing environments. The first method uses an airflow hood to measure the total airflow of each air outlet. Specifically, after the first air handling unit is operating at a preset speed and the system reaches a stable state, the commissioning personnel use a calibrated airflow hood to sequentially cover each air outlet at the end of the air supply line, directly reading the instantaneous airflow value of that outlet. Finally, the measured values ​​of all outlets are algebraically summed to obtain the total air volume at that speed. The advantage of this method is that it directly measures the end-point output result, is not affected by uneven airflow distribution or eddies within the pipeline, and has high data accuracy. It is particularly suitable for scenarios where the air supply terminals have been installed and there is sufficient operating space. The second method is to obtain the total air volume based on the measurement and conversion of the cross-sectional wind speed of the air supply pipeline. Specifically, a relatively stable straight section of the main air supply duct of the first air handling unit is selected as the test section. An anemometer (such as a hot-wire anemometer or Pitot tube) is used to measure the wind speed at multiple points along this section according to specifications. The average wind speed of the section is calculated and then multiplied by the effective flow area of ​​that section to calculate the total air volume. The advantage of this method is that it does not require contact with the terminal air outlets, allowing for measurement before ceiling sealing or when the terminal outlets are inconvenient to disassemble, thus offering greater flexibility. It is important to emphasize that although the two measurement methods differ in operation, their essence is to obtain the true flow response of the airflow under the actual pipeline resistance, and both can effectively reflect the comprehensive impact of on-site resistance characteristics on equipment performance. In actual engineering implementation, commissioning personnel can flexibly choose one method based on factors such as on-site construction progress, pipeline layout, and test conditions, or combine them at different stages for mutual verification. Regardless of the method used, as long as the obtained data accurately reflects the actual air supply capacity under the current pipeline resistance, it can be used as a valid input parameter for the collaborative control method of this application.

[0052] Example 5:

[0053] Building upon Examples 1 to 4, this example further defines the system's boundary handling and safety protection mechanisms under special operating conditions to ensure that the shared air supply duct architecture can maintain basic operational safety and robustness under various non-ideal conditions. Specifically, this mechanism covers airflow maintenance strategies during single-device operation and collaborative exit strategies under abnormal conditions.

[0054] In one implementation, in response to the independent operation of the second air handling unit, a preset minimum sustaining voltage is output to the air supply power source of the first air handling unit to establish a smooth airflow path through the interior of the first air handling unit and the shared air supply duct. In a traditional independent duct system, when a unit stops operating, its corresponding duct is closed or idle. However, in a shared duct architecture, the air outlet of the second air handling unit is connected to the fresh air inlet of the first air handling unit, and both share the downstream air supply channel. When only the second air handling unit is operating and the first air handling unit is completely shut down, if the air supply power source of the first air handling unit is in a de-energized and static state, its internal impeller, heat exchanger, and filter assembly will form a huge static flow resistance, and may even completely cut off the airflow path due to the check valve closing or the impeller stalling. This will not only cause the airflow discharged from the second air handling unit to accumulate at the inlet of the first air handling unit, generating high-pressure whistling or causing fan surge, but may also lead to humidity control failure because fresh air cannot be delivered into the room. Therefore, this embodiment applies a preset minimum sustaining voltage to the air supply power source of the first air handling unit, driving its impeller to rotate at an extremely low speed. It is important to emphasize that the purpose of setting this voltage is not to regulate temperature or provide effective airflow; its value is typically far lower than the minimum operating voltage of the first air handling unit. It is solely to overcome mechanical friction and static pressure resistance, creating a passive, low-resistance flow channel within the first air handling unit, thereby ensuring that the airflow output from the second air handling unit can smoothly pass through the first air handling unit and enter the shared air supply duct. For example, in specific engineering implementations, this preset minimum sustaining voltage can be set to approximately 3V DC. This value is pre-calibrated based on the starting torque characteristics of the first air handling unit's fan and the minimum reliable operating voltage, maintaining unobstructed airflow without generating significant additional noise or energy consumption. It should be understood that this voltage value varies depending on the fan model and duct resistance characteristics and should not be considered a limitation on the scope of protection of this application.

[0055] As another implementation, in response to the detection of missing airflow parameters, invalid gear matching, equipment failure, or configuration conflict, the step of controlling the air supply power source of the second air handling unit based on the target air supply output is stopped. This abnormal exit mechanism constitutes the safety bottom line of the collaborative control system. Since the collaborative control of this application highly depends on the accuracy of the field-calibrated airflow and the reliability of real-time status matching, once the above basic conditions are damaged, continuing to execute collaborative takeover may lead to more serious consequences than non-coordination. Specifically, missing airflow parameters mean that the system has lost the benchmark data reflecting the actual resistance at the field, and the calculated target output will lose its physical basis; invalid gear matching indicates that the first air handling unit is in a transitional state or abnormal fluctuation zone, and the current mainstream field state cannot be determined; equipment failure or communication abnormality directly cuts off the information link of closed-loop control; configuration conflict (such as one second air handling unit being incorrectly bound to multiple first air handling units) will lead to logical confusion in the control commands. When any of the above abnormal conditions are detected, the controller immediately releases the active takeover of the air supply power source of the second air handling unit, allowing its control to return to its own default control logic. This design principle ensures that even if the collaborative algorithm fails, the second air handling unit can still operate as an independent unit according to the factory preset or user local settings, avoiding the risk of the entire air handling system being paralyzed due to the main control logic crash.

[0056] Example 6:

[0057] This embodiment provides a parameterized implementation method for a specific application scenario, taking a residential whole-house air system as an example, to further illustrate the details of the implementation of the aforementioned collaborative control method in actual engineering. In this embodiment, the air supply power source of the second air handling unit is a DC brushless motor. Specifically, DC brushless motors have the characteristics of wide speed range, fast response speed, and high efficiency, making them very suitable as collaborative slave devices that require frequent output adjustments. Controlling the air supply power source of the second air handling unit based on the target air supply output includes adjusting the drive voltage of the DC brushless motor to make the air supply power source of the second air handling unit operate according to the target air supply output. This control method utilizes the good linear or near-linear relationship between the speed of the DC brushless motor and the drive voltage, which can accurately convert the abstract target air volume command into an executable electrical signal, realizing stepless adjustment of air volume and improving the comfort of the living environment.

[0058] To more clearly demonstrate the technical solution of this application, a set of specific field calibration data and mapping parameters are provided below as an example. During the installation and commissioning phase of a typical residential project, the commissioning personnel measured the field calibration air volume and corresponding output voltage of the first air handling unit at four preset operating levels as follows: High level corresponds to a voltage of 7.6V and a field calibration air volume of 1200m³ / h; Medium level corresponds to a voltage of 5.8V and a field calibration air volume of 1000m³ / h; Low level corresponds to a voltage of 4.0V and a field calibration air volume of 800m³ / h; Sleep level corresponds to a voltage of 2.9V and a field calibration air volume of 600m³ / h. These data accurately reflect the actual resistance characteristics of the specific building's piping network under various operating conditions, constituting a benchmark database for subsequent coordinated control. It should be understood that the above values ​​are only valid for this specific installation environment. Actual measured data may vary depending on the apartment type, pipe length, or air outlet configuration, but this does not affect the universality of the control logic of this application.

[0059] After obtaining the above-mentioned on-site calibrated air volume, the system uses the following pre-defined mapping relationship in the form of a quadratic function to calculate the target output voltage of the second air handling unit:

[0060] Wherein, represents the on-site calibrated air volume corresponding to the current matching gear, in m³ / h; represents the calculated target output voltage of the second air handling unit's air supply power source, in V. This formula is an empirical model obtained by fitting the fan performance curve of a specific model of fresh air dehumidifier with the flow resistance characteristics of the shared pipeline. A quadratic function is used instead of a simple linear proportion because the power consumption of the fan system and the air volume are usually non-linearly related. Furthermore, in the shared pipeline, as the air volume of the main equipment increases, the static pressure inside the pipe rises, which leads to a decrease in the effective work capacity of the secondary equipment. The negative coefficient of the quadratic term is precisely to compensate for this efficiency decay in the high air volume area, ensuring that the fresh air supply volume maintains a reasonable ratio with the air volume of the main equipment throughout the entire range. For example, when the first air handling unit is operating at medium speed ( When the voltage is in sleep mode, substituting it into the formula yields a target voltage of approximately 5.87V; when running in sleep mode... At this point, the target voltage is approximately 3.68V. These calculated values ​​enable the brushless DC motor to output a matching airflow, maintaining pressure balance within the system.

[0061] In terms of dynamic coordination, this embodiment incorporates real-time adjustments based on changes in indoor load. The system collects the actual indoor temperature and set temperature of each room through the connected room thermostats, and calculates the effective room temperature difference. As a load characterization quantity. In automatic fan mode, when the effective room temperature difference... When a change in the system triggers the first air handling unit to adjust its operating level, the controller will immediately re-execute the level matching and target output calculation. For example, assuming the system was originally operating at the medium level, an increase in indoor heat load leads to an increase in the effective room temperature difference... If the airflow continues to exceed the threshold, the controller determines that an increase in airflow is needed and switches the first air handling unit to high speed. In that instant, the controller detects a jump in the main unit's output voltage from 5.8V to 7.6V, immediately recognizes the change in the current matching speed to high speed, and retrieves the on-site calibrated airflow of 1200m³ / h corresponding to high speed. It then substitutes this value into the aforementioned quadratic function formula to recalculate the target output voltage of the second air handling unit. The entire recalculation and command issuance process is completed within milliseconds, allowing the second air handling unit's drive voltage to smoothly transition from 5.87V to the target value corresponding to high speed. This avoids imbalances in the fresh air ratio or duct whistling caused by a sudden increase in the main unit's airflow, ensuring environmental stability and quiet operation during variable airflow processes.

[0062] Furthermore, regarding the reliability assurance of gear matching, the specific value of the preset allowable range in this embodiment is set to ±0.1V. This value is determined based on the following: the analog-to-digital converter (AD) sampling resolution used by the controller is 0.02V. Considering power supply ripple and sampling noise, ±0.1V covers 5 LSBs (least significant bits), which is sufficient to filter out normal electrical interference. Simultaneously, the minimum voltage interval between adjacent gears (e.g., between sleep mode 2.9V and low mode 4.0V) is 1.1V. The tolerance of ±0.1V is far less than half of the interval, fundamentally eliminating the possibility of misjudgment across gears. This specific parameter setting ensures the accuracy of system status recognition during long-term operation.

[0063] It should be specifically noted that all voltage values, airflow values, formula coefficients, temperature difference thresholds, and time parameters mentioned in this embodiment are merely specific examples to illustrate the technical solution of this application, intended to help those skilled in the art understand the implementation path of the invention, and do not constitute a limitation on the scope of protection of this application. In practical applications, those skilled in the art can adjust, calibrate, or optimize the above parameters according to the selected fan model, pipeline design standards, sensor accuracy, and user comfort requirements. Such parameter changes based on the core concept of this application should all be covered within the scope of protection of this application.

[0064] Example 7:

[0065] Based on Examples 1 to 6, this example further defines a coordinated control strategy for airflow and water supply temperature between the first and second air handling units in a joint operation mode. This example is applicable to scenarios where the first and second air handling units share an air supply duct. The first air handling unit not only has airflow regulation capabilities but also water supply temperature regulation capabilities, enabling it to respond to changes in indoor load through a combination of these two dimensions of control.

[0066] Specifically, in the joint operation mode, the first air handling unit selects a control combination based on the indoor load demand. This control combination includes at least three methods: the first is constant air volume with variable water temperature control, which maintains a constant air volume corresponding to the current fan speed while adjusting the water supply temperature to respond to load changes; the second is variable air volume with constant water temperature control, which maintains a constant water supply temperature while adjusting the air volume to respond to load changes; and the third is variable air volume with variable water temperature control, which simultaneously adjusts both air volume and water supply temperature to respond to load changes. These three control combinations cover all the adjustment strategies of the first air handling unit under different load conditions, providing a clear basis for judging the operating conditions of the second air handling unit's coordinated output.

[0067] For any of the above control combinations, the controller determines the target air supply output of the second air handling unit based on the current operating level and corresponding air supply status of the first air handling unit. Specifically, if the first air handling unit maintains its current matching level and only adjusts the water supply temperature, the target air supply output of the second air handling unit remains unchanged at the value corresponding to the current matching level. This is because adjusting the water supply temperature does not affect the air supply power output of the first air handling unit, so the second air handling unit does not need to be re-matched. If the current matching level of the first air handling unit changes, whether it is variable air volume constant water temperature control or variable air volume variable water temperature control, the controller re-executes the step of determining the current matching level from multiple preset operating levels based on real-time operating status parameters, and recalculates the target air supply output of the second air handling unit based on the field-calibrated air volume corresponding to the changed current matching level. This collaborative logic ensures that the output adjustment of the second air handling unit is only triggered when there is a substantial change in the mainstream field characteristics within the shared pipeline, avoiding unnecessary output fluctuations caused by water supply temperature adjustments and improving the stability of system operation.

[0068] In non-automatic fan speed mode, the controller maintains the user-set fan speed and adjusts the water supply temperature based on indoor load characteristics, performing constant air volume variable water temperature control. Non-automatic fan speed modes include high, medium, low, and sleep modes. In this mode, load judgment is used to determine the direction and magnitude of water supply temperature adjustment, not to change the user-set fan speed. Because the fan speed remains unchanged, the target air supply output of the second air handling unit is matched according to the on-site calibrated air volume corresponding to the currently set fan speed, maintaining a stable coordinated output. For example, when the user sets the first air handling unit to medium speed, regardless of how the water supply temperature is adjusted, the second air handling unit always calculates the target air supply output according to the on-site calibrated air volume corresponding to medium speed.

[0069] In automatic fan speed mode, the controller autonomously selects the control combination based on the indoor load characteristics. For low-to-medium load conditions, if the current water supply temperature adjustment can meet the indoor load demand, the controller maintains the current fan speed and adjusts the water supply temperature; in this case, the target air output of the second air handling unit remains unchanged. Low-to-medium load conditions refer to situations where, with the first air handling unit maintaining its current fan speed, adjusting the water supply temperature can achieve the desired effective room temperature difference. Maintain within the preset temperature difference range, or maximize the effective room temperature difference. The operating condition exhibits a convergence trend. If the water supply temperature adjustment reaches the preset capacity boundary, for example, the water supply temperature has dropped to the minimum value allowed by the system or risen to the maximum value, while the indoor temperature deviation still continues to exceed the preset temperature difference threshold, the controller determines that water temperature adjustment alone cannot meet the load demand, and therefore adjusts the air volume or simultaneously adjusts the air volume and water supply temperature. At this time, the current matching level of the first air handling unit changes, and the controller immediately triggers the rematching of the second air handling unit and recalculation of the target air supply output to ensure that the coordinated output of the slave unit immediately follows the new operating condition of the master unit.

[0070] When a user sets the first air handling unit to low or sleep mode, this setting indicates a low-noise requirement. In this mode, the first air handling unit maintains a correspondingly low airflow and responds to indoor load changes by adjusting the water supply temperature. Since the controller does not actively increase the airflow of the first air handling unit, and the target airflow output of the second air handling unit is matched to the on-site calibrated airflow corresponding to the low or sleep mode, the combined airflow in the shared air supply duct remains at a low level, effectively reducing the risk of increased airflow noise due to excessive combined airflow. For example, in a nighttime sleep scenario, if the user sets the first air handling unit to sleep mode, it operates at the lowest airflow, with the water supply temperature fine-tuned according to the indoor temperature. The second air handling unit calculates the target airflow output according to the on-site calibrated airflow corresponding to the sleep mode and operates with a lower airflow power output. The entire system meets basic temperature and humidity control requirements while keeping operating noise at a minimum level.

[0071] After the first air handling unit executes the above control strategy, the actual operating level and corresponding air supply status of its air supply power source are used in the joint operation control process in the aforementioned embodiment. That is, it is used to match the current level, select the corresponding on-site calibrated air volume, and calculate the target air supply output of the second air handling unit. This means that the air volume and water temperature coordinated control strategy and the aforementioned dynamic coordination mechanism based on the on-site calibrated air volume form an organic hierarchical relationship: the upper-level air volume and water temperature coordinated control strategy determines the operating level of the first air handling unit at each moment, while the lower-level dynamic coordination mechanism calculates and adjusts the output of the second air handling unit in real time according to the operating level. The two work together to ensure the stable, efficient, and low-noise operation of the shared air supply pipeline system across the entire operating range.

[0072] It should be understood that the selection logic of control combinations, the switching conditions between non-automatic and automatic fan speeds, the criteria for determining low- and medium-load operating conditions, and the identification method for low-noise requirements in this embodiment are all specific implementation methods listed to illustrate the technical concept of this application. In practical applications, those skilled in the art can make corresponding adjustments or optimizations to the above logic according to specific system configurations, user needs, and control accuracy requirements. For example, they can add additional control combination types, adjust the threshold parameters for load determination, or introduce predictive control algorithms. Such changes should all be covered within the protection scope of this application.

[0073] Example 8:

[0074] This embodiment provides a collaborative control device for air handling equipment with a shared air supply duct. The device includes a processor and a memory. The memory stores a computer program, and the processor executes the computer program to implement the collaborative control method as described in any one of embodiments 1 to 7. Specifically, the processor, as the core of the device's computation and control, can be a general-purpose microprocessor, digital signal processor, application-specific integrated circuit, or field-programmable gate array (FPGA) or other computing unit with data processing capabilities. It communicates with the memory via a bus or internal interface. The memory is used to persistently store the computer program instructions that implement the aforementioned collaborative control logic, as well as intermediate data generated during operation, such as on-site calibrated airflow meters, preset mapping parameters, and real-time acquired status parameters. Its form can include read-only memory, random access memory, flash memory, or disk storage media. When the processor loads and executes the computer program in the memory, it is configured to perform a series of collaborative control steps, such as acquiring the on-site calibrated airflow, matching the real-time operating speed, calculating the target air supply output, and controlling the power source. This transforms general-purpose computing hardware into a specific functional device dedicated to solving the airflow coupling problem in shared ducts.

[0075] In practical engineering applications, the physical deployment of this collaborative control device is diverse to adapt to different system integration needs. For example, the device can be directly integrated into the built-in main control board of the first or second air handling unit, utilizing the existing computing resources of the equipment to achieve localized real-time collaborative control. This approach offers fast response speeds and eliminates the need for additional hardware costs. Alternatively, the device can function as an independent intelligent gateway or centralized controller, interacting with the two devices via wired or wireless communication protocols. This approach facilitates intelligent upgrades to existing systems or unified management of multiple devices. Furthermore, with the development of IoT technology, some or all of the device's functions can be deployed on a cloud server. The cloud platform performs complex mapping calculations or strategy optimizations before sending target output instructions to the terminal devices for execution. It should be understood that regardless of the physical carrier or deployment location, as long as it includes a processor and memory and can execute programs to implement the collaborative control methods described in the aforementioned embodiments, it falls within the scope of protection of this application.

[0076] Example 9:

[0077] like Figure 1 As shown, this embodiment provides an air handling system with a shared air supply duct. The system includes a first air handling unit, a second air handling unit, a shared air supply duct connecting the first and second air handling units, and a collaborative control device as described in Embodiment 8. Specifically, in Figure 1 In the specific application scenario shown, the first air handling unit is a full air handling unit, and the second air handling unit is a fresh air dehumidifier 3. The air processed by the second air handling unit is not directly delivered into the room; instead, it is first injected into the first air handling unit, mixed with the air processed by the first unit, and then transported to the terminal through the same set of pipes. This specific physical connection method is the root cause of the fluid dynamic coupling effect between the two devices during operation, and is also the specific applicable scenario for which the cooperative control method described in the foregoing embodiments of this application is targeted.

[0078] In this system, the air outlet 2 of the first air handling unit is connected to a common air supply duct, and the air outlet 4 of the second air handling unit is connected to the fresh air inlet 5 of the first air handling unit. Specifically, as follows... Figure 1 As shown, the air outlet 4 of the fresh air dehumidifier 3 is connected to the fresh air inlet 5 on the side of the all-air handling unit via a duct, allowing the dehumidified fresh air to enter the all-air handling unit; while the air outlet 2 at the top of the all-air handling unit is directly connected to the common air supply duct, delivering the mixed and treated air to the air supply terminals of each room. The first air handling unit also has a return air inlet 1, through which the return air from each room enters the first air handling unit. It should be understood that, although Figure 1 discloses a specific layout where the fresh air dehumidifier 3 is located on the left side of the full air handling unit and connected by an elbow, which is only schematic. In actual engineering implementation, the relative positions of the two devices, the routing and length of connecting pipes, and the form of pipe fittings can all be flexibly adjusted according to the ceiling space, comprehensive pipeline layout, and installation and maintenance conditions at the construction site. For example, the second air handling device can also be hoisted above or below the first air handling device, or the two can be connected by a flexible air duct to meet the shock absorption requirements. As long as the core air flow logic relationship that "the air outlet of the second air handling device is communicated with the fresh air inlet of the first air handling device" and "the air supply outlet of the first air handling device is communicated with the common air supply pipeline" is satisfied, it shall fall within the protection scope of the present application.

[0079] In addition, the system further comprises a cooperative control device as described in Embodiment 7. As the intelligent center of the system, the cooperative control device is configured to execute the cooperative control method according to any one of the foregoing Embodiments 1 to 6. In specific deployment, the cooperative control device can be integrated into the main control board of the first air handling device, and use its existing computing power resources to realize the linkage control of the second air handling device; it can also be integrated into the second air handling device, and obtain the status information of the first air handling device through the communication bus; it can also exist as an independent gateway module or a cloud service unit. Regardless of the physical carrier adopted, the device realizes flexible adaptation and dynamic decoupling at the control level by perceiving the operating status of the first air handling device in real time and dynamically adjusting the output of the second air handling device based on the on-site calibrated air volume.

[0080] It should be noted that the above embodiments can be freely combined as required. The above are only preferred embodiments of the present application. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present application, and these improvements and modifications should also be regarded as the protection scope of the present application.

Claims

1. A collaborative control method for air handling equipment sharing a common air supply duct, used in scenarios where a first air handling unit and a second air handling unit share a common air supply duct, characterized in that, The method includes: Obtain the on-site calibrated air volume of the first air handling unit at multiple preset operating levels; Obtain the real-time operating status parameters of the first air handling unit; Based on the real-time operating status parameters, the current matching gear is determined from the plurality of preset operating gears; Based on the on-site calibrated air volume corresponding to the current matching gear, the target air supply output of the second air handling unit is determined; The air supply power source of the second air handling unit is controlled based on the target air supply output.

2. The collaborative control method for air handling equipment with a shared air supply duct as described in claim 1, characterized in that, The step of determining the current matching gear from the plurality of preset operating gears based on the real-time operating status parameters includes: Calculate the state difference between the real-time operating state parameters and the preset state parameters corresponding to each preset operating gear; The preset operating gear corresponding to the minimum state difference is selected as the candidate gear. In response to the minimum state difference being within a preset allowable range, the candidate gear position is determined as the current matching gear position.

3. The collaborative control method for air handling equipment with a shared air supply duct as described in claim 2, characterized in that, The real-time operating status parameter is the current output voltage of the air supply power source of the first air handling equipment; The preset state parameter is the preset output voltage corresponding to each preset operating gear; The preset allowable range is a fixed threshold determined based on the analog-to-digital conversion sampling resolution and the voltage interval between adjacent preset operating levels.

4. The collaborative control method for air handling equipment with a shared air supply duct as described in claim 1, characterized in that, The step of determining the target air supply output of the second air handling unit based on the on-site calibrated air volume corresponding to the current matching gear includes: Based on the on-site calibrated air volume corresponding to the current matching gear, the target air supply output is calculated through a preset mapping relationship; In response to a change in the current matching gear of the first air handling unit, the step of determining the current matching gear from the plurality of preset operating gears based on the real-time operating status parameters is re-executed, and the target air supply output is recalculated based on the on-site calibrated air volume corresponding to the changed current matching gear.

5. The collaborative control method for air handling equipment with a shared air supply duct according to claim 1, characterized in that, The on-site calibrated air volume is the total air supply volume obtained based on the actual pipeline resistance measurement under the multiple preset operating levels.

6. The method for coordinated control of air handling equipment with a shared air supply duct according to claim 5, characterized in that, The multiple preset operating levels include at least high, medium, low and sleep modes; The total air supply volume obtained based on actual pipeline resistance measurement includes: Use an airflow hood to measure the total airflow from each air outlet; or, The total air volume is obtained by measuring and converting the wind speed at the cross-section of the air supply duct.

7. The collaborative control method for air handling equipment with a shared air supply duct according to claim 1, characterized in that, The method further includes: In response to the second air handling unit operating independently, a preset minimum sustaining voltage is output to the air supply power source of the first air handling unit to establish a smooth airflow path through the interior of the first air handling unit and the shared air supply duct. In response to the detection of missing air volume parameters, invalid gear matching, equipment failure, or configuration conflict, the step of controlling the air supply power source of the second air handling unit based on the target air supply output is stopped.

8. The method according to claim 1, characterized in that, In the combined operation mode, the first air handling unit selects a control combination based on the indoor load demand. The control combination includes at least constant air volume variable water temperature control, variable air volume constant water temperature control, and variable air volume variable water temperature control. For any of the control combinations: If the first air handling unit maintains the current matching setting and adjusts the water supply temperature, then the target air output of the second air handling unit is maintained at the value corresponding to the current matching setting. If the current matching gear of the first air handling unit changes, the step of determining the current matching gear from the plurality of preset operating gears based on the real-time operating status parameters is re-executed, and the target air supply output is recalculated based on the on-site calibrated air volume corresponding to the changed current matching gear.

9. A collaborative control device for air handling equipment sharing a common air supply duct, characterized in that, It includes a processor and a memory, wherein the memory stores a computer program, and the processor executes the computer program to implement the method as described in any one of claims 1 to 8.

10. An air handling system with a shared air supply duct, characterized in that, It includes a first air handling unit, a second air handling unit, a common air supply duct connecting the first air handling unit and the second air handling unit, and a collaborative control device as described in claim 9; The air outlet of the first air handling unit is connected to the shared air supply duct, and the air outlet of the second air handling unit is connected to the fresh air inlet of the first air handling unit.

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