Self-calibration method, device, system and storage medium of central range hood system

Abstract

The application discloses a self-calibration method and device of a central smoke machine system, the central smoke machine system and a computer readable storage medium. The self-calibration method of the central smoke machine system comprises the following steps: controlling a smoke machine of a to-be-tested floor to be turned on; controlling the smoke machine of the to-be-tested floor to operate at a preset air volume, wherein the preset air volume is determined by a calibration coefficient and a target air volume; acquiring an actual air volume of the smoke machine of the to-be-tested floor; in the case that a relationship between the target air volume and the actual air volume of the smoke machine of the to-be-tested floor meets a preset condition, determining that the calibration coefficient is a target calibration coefficient of the smoke machine of the to-be-tested floor; and in the case that the relationship between the target air volume and the actual air volume of the smoke machine of the to-be-tested floor does not meet the preset condition, correcting the calibration coefficient and returning to the step of controlling the smoke machine of the to-be-tested floor to operate at the preset air volume. The self-calibration method can guarantee the reliability of system air volume control.

Description

Technical Field

[0001] This invention relates to the field of smoke exhaust equipment technology, and in particular to a self-calibration method, self-calibration device, central smoke exhaust system, and computer-readable storage medium for a central smoke exhaust system. Background Technology

[0002] In related technologies, a central smoke hood system can be applied to buildings with public smoke exhaust ducts. The central smoke hood system includes a smoke hood installed in the user's home, which can be a range hood or a smoke collection hood.

[0003] In actual use, due to issues such as improper installation, component aging, and oil fume accumulation, the actual aerodynamic characteristics of each component in the central smoke extraction system will differ from the pre-calibrated values, especially as the usage time increases. This can lead to difficulties in accurately controlling the airflow at the user end during actual use, affecting the actual smoke extraction effect. Summary of the Invention

[0004] The present invention provides a self-calibration method, a self-calibration device, a central smoke machine system, and a computer-readable storage medium for a central smoke machine system.

[0005] A self-calibration method for a central smoke machine system according to an embodiment of the present invention includes:

[0006] Control the smoke hood of the floor to be tested to turn on;

[0007] The smoke hood on the floor under test is controlled to operate at a preset air volume, which is determined by a calibration coefficient and a target air volume.

[0008] Obtain the actual air volume of the smoke hood on the floor to be tested;

[0009] If the relationship between the target air volume and the actual air volume of the smoke hood on the floor to be tested meets the preset conditions, the calibration coefficient is determined as the target calibration coefficient of the smoke hood on the floor to be tested.

[0010] If the relationship between the target air volume and the actual air volume of the smoke hood on the floor under test does not meet the preset conditions, the calibration coefficient is corrected, and the process returns to controlling the smoke hood on the floor under test to operate at the preset air volume.

[0011] The self-calibration method described above can control the operation of the smoke hood on the floor under test by a preset air volume determined by the calibration coefficient and the target air volume. The calibration coefficient of the floor under test is determined based on whether the relationship between the target air volume and the actual air volume of the smoke hood on the floor under test meets the preset conditions. This reduces the air volume control deviation caused by the deviation between the actual aerodynamic characteristic parameters of each component and the preset calibration value, and ensures the reliability of the system's air volume control.

[0012] In some implementations, the preset condition includes the ratio between the target air volume and the actual air volume being within a preset range.

[0013] In some implementations, controlling the smoke hood on the floor under test includes:

[0014] All smoke hoods on the floors to be tested are grouped according to the preset synchronization rate;

[0015] Under the preset synchronization rate, control all the smoke hoods on the floors to be tested in each group to be turned on.

[0016] In some implementations, different preset synchronization rates correspond to different calibration coefficients;

[0017] The self-calibration method includes:

[0018] Obtain the current synchronization rate and determine the synchronization rate interval to which the current frequency belongs, wherein multiple preset synchronization rates are determined for the synchronization rate interval;

[0019] Based on the synchronization rate range and the current synchronization rate, determine the current calibration coefficient corresponding to the current synchronization rate.

[0020] In some implementations, determining the current calibration coefficient corresponding to the current synchronization rate based on the synchronization rate range and the current synchronization rate includes:

[0021] Obtain the upper and lower limits of the synchronization rate range, the first calibration coefficient corresponding to the upper limit synchronization rate, and the second calibration coefficient corresponding to the lower limit synchronization rate;

[0022] The current calibration coefficient is determined based on the upper limit synchronization rate, the lower limit synchronization rate, the first calibration coefficient, the second calibration coefficient, and the current synchronization rate.

[0023] In some embodiments, obtaining the actual air volume of the smoke hood on the floor to be tested includes:

[0024] The actual air volume of the smoke hood on the floor under test is obtained using the measurement data from the sensor.

[0025] In some embodiments, the sensor is installed in a branch exhaust duct that connects to a common exhaust duct and the smoke hood on the floor to be tested. The sensor is shielded by a movable baffle. During the self-calibration process, the baffle is removed to allow the sensor to collect the data required to obtain the actual air volume. After the self-calibration process is completed, the baffle shields the sensor.

[0026] In some embodiments, the sensor's measurement data includes at least one of the static pressure at the floor exhaust fan outlet, the static pressure at the inlet of the electrically controlled valve, and the power of the floor exhaust fan.

[0027] A self-calibration device for a central smoke machine system according to an embodiment of the present invention includes a processor and a memory. The memory stores a computer program, which, when executed by the processor, implements the steps of the self-calibration method for the central smoke machine system according to any of the above embodiments.

[0028] An embodiment of the present invention provides a central smoke machine system including the self-calibration device of the central smoke machine system described above.

[0029] This invention provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the self-calibration method for the central smoke machine system of any of the above embodiments.

[0030] The aforementioned self-calibration device, central smoke hood system, and computer-readable storage medium can control the operation of the smoke hood on the floor under test by a preset airflow determined by the calibration coefficient and the target airflow. The calibration coefficient of the floor under test is determined based on whether the relationship between the target airflow and the actual airflow of the smoke hood on the floor under test meets the preset conditions. This reduces the airflow control deviation caused by the deviation between the actual aerodynamic characteristic parameters of each component and the preset calibration value, and ensures the reliability of the system's airflow control.

[0031] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0032] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0033] Figure 1 This is a flowchart illustrating the self-calibration method of the central smoke machine system according to an embodiment of the present invention;

[0034] Figure 2 This is an installation diagram of the distributed central smoke machine system according to an embodiment of the present invention;

[0035] Figure 3 This is an installation diagram of the centralized central smoke machine system according to an embodiment of the present invention;

[0036] Figures 4 to 6 This is a flowchart illustrating the self-calibration method of the central smoke machine system according to an embodiment of the present invention;

[0037] Figure 7 This is a schematic diagram of the central smoke machine system according to an embodiment of the present invention;

[0038] Figure 8This is a structural diagram of a traditional smoke extraction system for high-rise residential buildings in related technologies;

[0039] Figure 9 This is a schematic diagram of a centralized smoke collection hood system in related technologies;

[0040] Figure 10 This is a schematic diagram of a distributed central smoke collection hood system in related technologies. Detailed Implementation

[0041] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0042] In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0043] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, and they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0044] In this invention, unless otherwise expressly specified and limited, the first feature "above" or "below" the second feature may include direct contact between the first and second features, or contact between the first and second features not in direct contact but through another feature between them.

[0045] This disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described herein. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0046] Currently, traditional smoke extraction systems in high-rise residential buildings consist of a public smoke extraction duct and branch lines at each user's end. For example... Figure 8 As shown, the branch lines consist of a range hood, a corrugated pipe, and a check valve. Fumes from the user end are discharged from the branch lines to the common exhaust duct, then flow upwards along the common exhaust duct and are discharged from the top. For lower-floor users, the exhaust resistance mainly comes from the common exhaust duct, including friction losses along the duct and merging losses when flowing through the exhaust outlets of the branch lines of users on upper floors. Therefore, when there are many open floors, the exhaust resistance for lower-floor users is higher, the range hood's suction volume is insufficient, and the actual exhaust effect is poor. Although range hood technology is constantly iterating towards higher air volume and lower noise, in some actual use cases, extremely high exhaust resistance makes it impossible to simultaneously achieve both high air volume and low noise levels. At the same time, due to the significant difference in exhaust resistance between upper-floor and lower-floor users, an awkward situation arises where upper-floor users have excessive actual air volume while lower-floor users have insufficient actual air volume, resulting in poor exhaust performance for lower-floor users and energy waste for upper-floor users. In addition, to prevent backflow of grease from the public exhaust duct into the user's end, a passive flue check valve is usually installed at the interface between the user's branch and the public exhaust duct. When the user's range hood is off, the flue check valve is usually kept closed by the spring force and the weight of the valve plate, preventing grease from the public exhaust duct from flowing into the user's branch. When the user's range hood is on, the fluid discharged from the branch into the public exhaust duct overcomes the spring force and the weight of the valve plate, causing the valve plate to open. However, this type of passive check valve has the following disadvantages: ① When the airflow in the branch is low, the valve plate opening angle is too small, resulting in high exhaust resistance; ② Problems such as aging and failure of the flue check valve spring and grease buildup on the valve plate can affect the sealing performance when the valve plate is closed, leading to backflow of grease.

[0047] Therefore, the smoke extraction problem in high-rise residential buildings is a systemic issue that requires system-level control measures to solve. This is where central smoke extraction systems come in. Central smoke extraction systems typically use a top-mounted fan located at the outlet of the public smoke extraction duct as the main or sole power source. Based on the airflow demand from users, the main unit coordinates and controls the operating status of all components of the entire smoke extraction system in real time, meeting the smoke extraction needs of users under all operating conditions.

[0048] Based on the branch power distribution method, central smoke machine systems can be divided into two categories: centralized and distributed. Schematic diagrams of the two types of central smoke machine systems are shown below. Figure 9 and Figure 10As shown. In a centralized central exhaust system, each branch has only a smoke collection hood, not a range hood. The entire system uses a top-mounted fan as its sole power source. At the interface between the branch and the common exhaust duct, a electrically controlled valve with an adjustable valve opening angle is installed. During system operation, the airflow distribution within the branch can be achieved by adjusting the valve's opening angle. In a distributed central exhaust system, each branch has an adjustable-speed range hood. The entire system uses a top-mounted fan as the primary power source, with the branch range hoods serving as auxiliary power sources. At the branch outlet, a electrically controlled valve with an adjustable valve opening angle is installed. This check valve has only two states: ON / OFF (fully open / fully closed). During system operation, the airflow distribution within the branch can be achieved by adjusting the speed of the branch range hood.

[0049] Due to differences in system components and operating mechanisms, the two types of central exhaust systems each have their own advantages. The advantages of a centralized central exhaust system are mainly reflected in the following aspects: the public exhaust duct is always under full negative pressure, which can strictly prevent oil fumes from flowing back into the user's kitchen from the public exhaust duct; since there are no exhaust fans in the branch circuits, the noise in the branch circuits is significantly reduced, with a reduction of up to 10dB; in addition, since there are no exhaust fans occupying space in the branch circuits of a centralized central exhaust system, the branch smoke collection hoods occupy a smaller size, and the shape design can be more flexible and aesthetically pleasing.

[0050] The advantages of a distributed central exhaust fan system are mainly reflected in the following aspects: Because the branch check valves of a distributed central exhaust fan system always keep the system fully open when the branch is working, the system resistance is lower than that of a centralized system under the same operating conditions, thus the overall energy consumption level is also better than that of a centralized system; the branch exhaust fans of a distributed central exhaust fan system can achieve the oil-fume separation function of traditional exhaust fans, and it is not easy for dirt to accumulate in the branch exhaust ducts; because the distributed central exhaust fan system has branch exhaust fans as an auxiliary power source, the operating parameters of the top fan are less demanding, and when the top fan fails, the exhaust function can still be achieved by relying on the branch exhaust fans, resulting in high system redundancy and high reliability.

[0051] However, regardless of whether it's a centralized or distributed central exhaust system, achieving efficient and accurate branch airflow distribution is the most critical issue. There are two main types of airflow distribution control methods: one is a closed-loop control system based on feedback control from pressure or flow sensors. However, due to severe oil fume pollution in the exhaust system, sensors are prone to failure, resulting in poor system reliability. Furthermore, the cost of the sensors themselves and subsequent maintenance is a real concern. The other type is an open-loop control method based on a one-dimensional aerodynamic model of the system, which offers lower cost and higher reliability in practical applications.

[0052] In actual use, due to improper installation, component aging, and oil fume accumulation, the actual aerodynamic characteristics of each component will differ from the pre-calibrated values, especially as the usage time increases. This can lead to difficulties in accurately controlling the airflow at the user end of the open-loop control system, affecting the actual smoke extraction effect. Therefore, it is necessary to calibrate the pre-calibrated values. To address this, this invention proposes a self-calibration method for a central smoke extraction system based on an open-loop control strategy. This method can effectively reduce the adverse effects of the deviation between the component aerodynamic characteristics and the pre-calibrated values ​​on the airflow control at the user end.

[0053] Please refer to Figures 1 to 3 A self-calibration method for a central smoke machine system 100 according to an embodiment of the present invention includes:

[0054] Step A: Turn on the smoke hood 12 on the floor to be tested;

[0055] Step B: Control the smoke hood 12 on the floor to be tested to operate at a preset air volume, which is determined by the calibration coefficient and the target air volume;

[0056] Step C: Obtain the actual air volume of the smoke hood 12 on the floor to be tested;

[0057] Step D: If the relationship between the target air volume and the actual air volume of the smoke hood 12 on the floor to be tested meets the preset conditions, determine the calibration coefficient as the target calibration coefficient of the smoke hood 12 on the floor to be tested.

[0058] Step E: If the relationship between the target air volume and the actual air volume of the smoke hood 12 on the floor to be tested does not meet the preset conditions, the calibration coefficient is corrected and the process returns to step B.

[0059] The above self-calibration method can control the operation of the smoke hood 12 on the floor under test by a preset air volume determined by the calibration coefficient and the target air volume. The calibration coefficient of the floor under test is determined based on whether the relationship between the target air volume and the actual air volume of the smoke hood 12 on the floor under test meets the preset conditions. This reduces the air volume control deviation caused by the deviation between the actual aerodynamic characteristic parameters of each component and the preset calibration value, and ensures the reliability of the system air volume control.

[0060] Specifically, please refer to Figure 2 and Figure 3 The central exhaust fan system 100 of this invention includes floor exhaust fans 12, corrugated pipes 14, electrically controlled valves 16, a common exhaust duct 18, a top-mounted fan 20, and a main unit 22. The entire central exhaust fan system 100 is divided into two parts: an exhaust duct and a control system. For a distributed central exhaust fan system 100, the floor exhaust fan 12 can be a range hood, which can be a standalone range hood or an integrated range hood within an integrated kitchen appliance. For a centralized central exhaust fan system 100, the floor exhaust fan 12 can be a smoke collection hood.

[0061] The smoke exhaust duct includes: the outlet of the floor smoke hood 12 is connected to one end of the corrugated pipe 14, and the other end of the corrugated pipe 14 is connected to the electric control valve 16. The floor smoke hood 12, the corrugated pipe 14 and the electric control valve 16 together form a branch; multiple branches are connected to the side wall of the public smoke exhaust duct 18; the upper outlet of the public smoke exhaust duct 18 is connected to the top fan 20; the valve plate of the electric control valve 16 can complete the action of closing / opening / adjusting the opening angle under the push of the motor.

[0062] Please refer to Figure 2 For the distributed central range hood system 100, its control system includes: variable frequency speed adjustment of the range hood and the top fan 20; data communication between the main unit 22 and the range hoods of each branch; data communication between the main unit 22 and the top fan 20; the main unit 22 includes a control platform that can receive data, process data, and send data; the electric control valve 16 in each branch can determine whether the range hood of the branch is turned on by communicating with the range hood of the branch or by power identification / pressure measurement of the range hood of the branch, and can perform linkage opening or linkage closing actions according to the determined range hood on status.

[0063] Please refer to Figure 3 For the centralized central smoke hood system 100, its control system includes: variable frequency speed regulation of the top fan 20; data communication between the main unit 22 and the electrically controlled valves 16 of each branch; data communication between the main unit 22 and the top fan 20; the main unit 22 includes a control platform that can receive, process, and transmit data; the electrically controlled valves 16 in each branch can obtain whether the user has turned on the machine through data communication with the smoke collection hood of that branch, and can open or close the machine according to the user's on status; the electrically controlled valves 16 can adjust the opening angle according to the opening angle (opening degree) command issued by the main unit 22.

[0064] When performing self-calibration, the central smoke hood system 100 can enter calibration mode. The command to enter calibration mode can be triggered by the user, or the central smoke hood system 100 can trigger it automatically, for example, according to a certain time interval; no specific limitation is made here.

[0065] After entering calibration mode, the host 22 can control the smoke hood 12 of the floor under test to turn on and operate at a preset air volume. The preset air volume can be determined by the calibration coefficient and the target air volume. In one embodiment, after entering calibration mode, the calibration coefficient α(i) of the smoke hood 12 of each floor under test is initialized to a preset value (e.g., initialized α(i) = 1 or other values), and the target air volume of the smoke hood 12 of the floor under test is set to a certain air volume Q(i) of the smoke hood 12 (e.g., Q(i) can be the maximum air volume of the smoke hood 12). The preset air volume can be the product of the initial calibration coefficient and the target air volume, i.e., Q(s) = α(i) * Q(i). i represents the floor where the smoke hood 12 is located.

[0066] The preset conditions can be simulated, tested, calibrated, and stored in advance. If the relationship between the target air volume and the actual air volume of the smoke hood 12 on the floor under test meets the preset conditions, it indicates that the deviation between the actual air volume and the target air volume (preset calibration value) of the smoke hood 12 on the floor under test is not large. Even without correcting the calibration coefficient, the error of the central smoke hood system 100 in controlling the air volume of the floor smoke hood 12 is within an acceptable range.

[0067] If the relationship between the target air volume and the actual air volume of the smoke hood 12 on the floor under test does not meet the preset conditions, it indicates that the deviation between the actual air volume and the target air volume (preset calibration value) of the smoke hood 12 on the floor under test is large. Only when the calibration coefficient of the smoke hood 12 on the floor under test needs to be corrected can the error of the air volume control of the central smoke hood system 100 on the smoke hood 12 be within an acceptable range.

[0068] After calibration, the target calibration coefficient α(i) for all floors is output. Under actual user conditions, the host 22 controls the airflow of the floor hood 12 on the i-th floor according to α(i)*Q(i) as the preset airflow input for the control algorithm. The calibration coefficient in this embodiment of the invention can be an airflow calibration coefficient. The control algorithm can be a pre-set open-loop control algorithm, which can pre-calibrate the aerodynamic characteristics of the system components through experimental calibration or empirical formula estimation.

[0069] In some implementations, the preset condition includes the ratio between the target air volume and the actual air volume being within a preset range.

[0070] In this way, the relationship between the target air volume and the actual air volume is easier to determine, thus improving efficiency.

[0071] Specifically, the actual air volume of the smoke hood 12 on the floor to be tested is Q_real(i), where Q_real(i) is the actual air volume of the smoke hood on the i-th floor.

[0072] The ratio between the target air volume and the actual air volume is R, where the target air volume is Q(i), and R = Q(i) / Q_real(i). The preset condition is that the ratio R between the target air volume and the actual air volume is between k and 1 / k, where k can be between 0.8 and 0.95.

[0073] Determine whether Q(i) / Q_real(i) is within the preset range. If yes, the relationship between the target air volume and the actual air volume of the smoke hood 12 on the floor to be tested meets the preset condition, and the calibration coefficient α(i) of the smoke hood 12 on that floor remains unchanged. If no, the calibration coefficient of the smoke hood 12 on that floor is corrected to α(i)*{1+β*[Q(i) / Q_real(i)-1]}, where β is the convergence factor and β>0.

[0074] If all the smoke hoods 12 on the floors that are turned on satisfy Q(i) / Q_real(i) within the preset range k to 1 / k, then the calibration of all smoke hoods 12 on the floors to be tested is completed, and the calibration coefficient value α(i) of each smoke hood 12 on the floors is output; otherwise, repeat steps B, C, D or B, C, E.

[0075] It is understood that in other implementations, the preset conditions can be other conditions, such as using the difference between the target air volume and the actual air volume of the floor smoke hood 12 for calibration, which is not specifically limited here.

[0076] In some implementations, please refer to Figure 4 Step A includes:

[0077] Step A1: Group all the smoke hoods 12 on the floors to be tested according to the preset synchronization rate;

[0078] Step A2: Under the preset synchronization rate, control all the smoke hoods 12 on the floors to be tested in each group to turn on.

[0079] In this way, all the smoke hoods 12 on the floors to be tested can be grouped and calibrated using the synchronization rate, thereby improving the calibration accuracy.

[0080] Specifically, the synchronization rate can be defined as the ratio between the number of activated floor exhaust fans 12 and the total number of floor exhaust fans 12. Grouping all the floor exhaust fans 12 to be tested according to the synchronization rate can reduce the number of activated floor exhaust fans 12 during a single self-calibration process, and also reduce the mutual influence of their respective airflow, thereby improving calibration accuracy.

[0081] Based on the synchronization rate, all the smoke machines 12 on the floors to be tested can be grouped according to certain principles. The synchronization rate can be the most commonly used synchronization rate when the system is working, and the value range of the synchronization rate S can be [0.15, 0.3].

[0082] In one implementation, all floors to be tested can be grouped according to the principle of uniform activation. Uniform activation means that the smoke hoods 12 activated during the calibration process are evenly distributed throughout the building. In one example, with a total of 20 floors and a synchronization rate S = 0.2, all floors are divided into five groups: Group 1 consists of floors 1, 6, 11, and 16; Group 2 consists of floors 2, 7, 12, and 17; Group 3 consists of floors 3, 8, 13, and 18; Group 4 consists of floors 4, 9, 14, and 19; and Group 5 consists of floors 5, 10, 15, and 20. During calibration, the smoke hoods 12 of each floor to be tested can be calibrated group by group. When calibrating the smoke hoods 12 of each group, all the smoke hoods 12 of the floors to be tested in each group are activated. For example, when calibrating the smoke hoods 12 of the first group, the smoke hoods 12 of floors 1, 6, 11, and 16 are activated. The target airflow for all the smoke hoods 12 on the floors to be tested in a group can be the same. For example, for all the smoke hoods 12 on the floors to be tested in the same group, the calibration coefficient is initialized to α(i) = 1, the target airflow Q(i) is the maximum airflow of each smoke hood 12 on the floors to be tested, and the preset airflow Q(s) = α(i) * Q(i). This simplifies the calibration process and improves efficiency. When the relationship between the target airflow and the actual airflow of all the smoke hoods 12 on the floors to be tested in a group meets the preset conditions, the target calibration coefficient for the smoke hoods on the floors to be tested in that group can be determined. Then, all the smoke hoods 12 on the floors to be tested in that group are turned off, and then all the smoke hoods 12 on the floors to be tested in another group are turned on to perform calibration for the other group of smoke hoods 12.

[0083] In some implementations, different preset synchronization rates correspond to different calibration coefficients;

[0084] Please refer to Figure 5 Self-calibration methods include:

[0085] Step F: Obtain the current synchronization rate and determine the synchronization rate range to which the current frequency belongs; multiple preset synchronization rates are determined for the synchronization rate range.

[0086] Step G: Determine the current calibration coefficient corresponding to the current synchronization rate based on the synchronization rate range and the current synchronization rate.

[0087] This can improve the accuracy of airflow control.

[0088] Specifically, since the difference between the synchronization rate under calibration conditions and the synchronization rate under actual use conditions may reduce the accuracy of air volume control, in order to mitigate this impact, a multi-synchronization rate calibration method can be adopted in the calibration mode.

[0089] More specifically, multiple synchronization rates (such as S1, S2, S3, …) can be selected for calibration, and these synchronization rates serve as the preset synchronization rates for the calibration conditions. For each floor fan 12, different preset synchronization rates correspond to different calibration coefficients. Each floor fan 12 has a air volume calibration coefficient for each synchronization rate. For example, for the floor fan 12 on the i-th floor, there are α1(i), α2(i), α3(i), …

[0090] Under actual operating conditions, the host 22 can calculate the current synchronization rate. Specifically, the current synchronization rate can be determined by the ratio between the number of currently activated floor fans 12 and the total number of floor fans 12, and further determine the synchronization rate interval to which the current same frequency belongs. The synchronization rate interval is determined by multiple preset synchronization rates. For example, the synchronization rate interval can be [S1, S2], (S2, S3], and so on.

[0091] Based on the synchronization rate interval and the current synchronization rate, the current calibration coefficient corresponding to the current synchronization rate can be determined.

[0092] In some embodiments, please refer to Figure 6 , step G includes:

[0093] Step G1, obtain the upper synchronization rate and the lower synchronization rate of the synchronization rate interval, the first calibration coefficient corresponding to the upper synchronization rate, and the second calibration coefficient corresponding to the lower synchronization rate;

[0094] Step G2, determine the current calibration coefficient according to the upper synchronization rate, the lower synchronization rate, the first calibration coefficient, the second calibration coefficient, and the current synchronization rate.

[0095] In this way, the current calibration coefficient can be specifically determined.

[0096] Specifically, the synchronization rate interval can be divided by multiple preset synchronization rates, and the preset synchronization rates can be calibration synchronization rates. For example, the multiple preset synchronization rates are S1, S2, S3, …, Sn respectively, and S1 < S2 < S3 < … < Sn. Each preset synchronization rate corresponds to an air volume calibration coefficient. For example, the synchronization rate S1 corresponds to the calibration coefficient α1(i), the synchronization rate S2 corresponds to the calibration coefficient α2(i), ….

[0097] Two adjacent preset synchronization rates can determine a synchronization rate interval, and determine in which interval (S

[0098] ≤ S_real ≤ S n+1 ) the current synchronization rate S_real is located under the preset synchronization rate, and then the upper synchronization rate, the lower synchronization rate, the first calibration coefficient, and the second calibration coefficient of this synchronization rate interval can be determined.

[0098] In one implementation, the current calibration coefficient α(i) of each floor under the current synchronization rate S_real can be obtained by linear interpolation, as shown in the following formula:

[0099]

[0100] The synchronization rate range is [S] n ,S n+1 ], S n+1 S represents the upper limit of the synchronization rate. n α is the lower limit of the synchronization rate. n+1 (i) is the first calibration coefficient corresponding to the upper limit synchronization rate, α n (i) is the second calibration coefficient corresponding to the lower limit synchronization rate.

[0101] It is understood that in other implementations, the synchronization rate interval can also be segmented to determine the current calibration coefficient. For example, the synchronization rate interval can be divided into three segments. When the current synchronization rate is in the first segment, which is close to the lower limit of the synchronization rate, the current calibration coefficient can be the second calibration coefficient corresponding to the lower limit of the synchronization rate. When the current synchronization rate is in the second segment, which is close to the upper limit of the synchronization rate, the current calibration coefficient can be the first calibration coefficient corresponding to the upper limit of the synchronization rate. When the current synchronization rate is in the third segment, the current synchronization rate can be determined using an interpolation method, with the third segment located between the first and second segments.

[0102] In some implementations, step C includes:

[0103] The actual air volume of the smoke hood on the floor to be tested is obtained by using sensor measurement data.

[0104] In this way, obtaining the actual air volume of the smoke hood 12 on the floor to be tested is relatively simple and quick.

[0105] Specifically, in one embodiment, the sensor may be a pressure sensor, and the actual air volume of the smoke hood 12 on the floor to be tested is determined using the measurement data of the pressure sensor.

[0106] In one implementation, the sensor can be a power sensor, and the actual airflow of the smoke hood 12 on the floor under test is determined using the measurement data from the power sensor. Using sensor measurement data to obtain the actual airflow of the smoke hood on the floor under test reduces the amount of calculation and is a simpler and faster method.

[0107] The sensor's measurement data can be transmitted directly to the host 22 or indirectly to the host 22. For example, the sensor can transmit the sensor's measurement data directly to the host 22 in a wired or wireless manner, or the sensor can transmit the sensor's measurement data to the floor smoke hood 12 in a wired or wireless manner, and then the floor smoke hood 12 uploads it to the host 22.

[0108] In some implementations, the sensor is installed in a branch exhaust duct that connects the public exhaust duct 18 to the smoke hood 12 on the floor to be tested. The sensor is shielded by a movable baffle. During the self-calibration process, the baffle is removed to allow the sensor to collect the data required to obtain the actual air volume. After the self-calibration process is completed, the baffle shields the sensor.

[0109] In this way, sensor failure caused by oil fume adhesion can be avoided. When the system enters calibration mode, the baffle can be removed to ensure that the pressure sensor works normally.

[0110] Specifically, the baffle can be connected to a drive mechanism. When the system enters calibration mode, the host 22 can control the drive mechanism to move the baffle away to expose the sensor, allowing the sensor to work normally. After the self-calibration method is completed, the host 22 can control the drive mechanism to move the baffle to cover the sensor to prevent sensor failure caused by oil fume adhesion.

[0111] The baffle can move by rotation, translation, or a combination of rotation and translation; no specific limitation is made here.

[0112] In one implementation, the baffle can also be moved manually by the user. For example, if the baffle is connected to a handle, the host 22 can prompt the user to remove the baffle during self-calibration to allow the sensor to acquire data. The user can remove the baffle using the handle. After calibration, the host 22 can prompt the user to reset the baffle so that it blocks the sensor.

[0113] In some implementations, the sensor's measurement data includes at least one of the static pressure at the outlet of the floor smoke hood 12, the static pressure at the inlet of the electrically controlled valve 16, and the power of the floor smoke hood 12.

[0114] In this way, the actual air volume measurement method of the floor range hood 12 can be flexibly selected, improving the user experience.

[0115] Specifically, for the distributed central smoke hood system 100, in one embodiment, the sensor measurement data includes the static pressure at the outlet of the floor smoke hood 12. The sensor includes a pressure sensor, which can be arranged at the outlet of the floor smoke hood 12 to measure the static pressure at the outlet of the floor smoke hood 12.

[0116] In one embodiment, the static pressure at the outlet of the floor exhaust fan 12 is Ps_in. The air volume Q of the floor exhaust fan 12, i.e. the actual air volume, can be obtained by using the pre-calibrated aerodynamic characteristic relationship f1 of the floor exhaust fan 12.

[0117] Ps_in = f1(N_yanji,Q) (Formula 1)

[0118] In the formula, Ps_in represents the static pressure at the outlet of the floor's smoke hood 12.

[0119] N_yanji — Rotation speed of floor smoke hood 12, controlled by main unit 22, is a known quantity;

[0120] Q – Airflow of the range hood on floor 12.

[0121] For the distributed central smoke hood system 100, in one embodiment, the sensor measurement data includes the static pressure at the inlet of the electrically controlled valve 16. The sensor includes a pressure sensor, which can be arranged at the inlet of the electrically controlled valve 16 (near the bellows 14 side) to measure the static pressure Ps_branch at the inlet of the electrically controlled valve 16. The static pressure Ps_in at the outlet of the floor smoke hood 12 can be derived from the following formula. Then, through the pre-calibrated aerodynamic characteristic relationship f1 (Formula 1) of the floor smoke hood 12, the air volume of the floor smoke hood 12, i.e. the actual air volume, can be iteratively obtained.

[0122] Ps_in=Ps_branch+Δp_b(Equation 2)

[0123] In the formula, Δp_b represents the resistance loss of the branch bellows 14, and Δp_b = ξ_b * 0.5 * ρ * V 2 ;

[0124] ξ_b——Belling pipe resistance coefficient;

[0125] V—average wind speed of the branch, V=Q_real / S, where S is the cross-sectional area of ​​the branch flue (floor flue);

[0126] ρ — air density.

[0127] For the distributed central smoke hood system 100, in one embodiment, the sensor measurement data includes the power of the floor smoke hood 12. The sensor includes a power detection sensor. The power Pw of the floor smoke hood 12 is detected by the power detection sensor. By pre-calibrating a better smoke hood power characteristic relationship f2, the air volume Q of the floor smoke hood 12, i.e. the actual air volume, can be obtained.

[0128] Pw = f2(N_yanji,Q) (Equation 3)

[0129] For a centralized central smoke hood system 100, in one embodiment, the sensor measurement data includes the static pressure at the outlet of the floor smoke hood 12 (smoke hood). The sensor includes a pressure sensor, which can be arranged at the outlet of the smoke hood to measure the static pressure Ps_in at the outlet of the smoke hood. The actual air volume can be obtained through the pre-calibrated smoke hood resistance characteristic relationship f3.

[0130] Ps_in = f3(Q) (Equation 4)

[0131] For a centralized central smoke hood system 100, in one embodiment, the sensor measurement data includes the static pressure at the inlet of the electrically controlled valve 16. The sensor includes a pressure sensor, which can be arranged at the inlet of the electrically controlled valve 16 (near the bellows 14 side) to measure the static pressure Ps_branch at the inlet of the electrically controlled valve 16. The static pressure Ps_in at the outlet of the smoke hood can be derived from Equation 2. Then, the actual air volume can be obtained through the pre-calibrated smoke hood resistance characteristic relationship f3.

[0132] Please refer to Figure 7 A self-calibration device 200 for a central smoke machine system 100 according to an embodiment of the present invention includes a processor 24 and a memory 26. The memory 26 stores a computer program, which, when executed by the processor 24, implements the steps of the self-calibration method of the central smoke machine system 100 according to any of the above embodiments.

[0133] Specifically, the self-calibration device 200 may include a host 22, and the self-calibration device 200 may be installed in a suitable location for easy maintenance.

[0134] Please refer to Figure 7 A central smoke machine system 100 according to an embodiment of the present invention includes a self-calibration device 200 of the central smoke machine system 100 according to any of the above embodiments.

[0135] This invention provides a computer-readable storage medium storing a computer program thereon. When executed by a processor 24, the computer program implements the steps of the self-calibration method of the central smoke machine system 100 according to any of the above embodiments.

[0136] It should be noted that the above explanation of the implementation method and its beneficial effects also applies to the self-calibration device 200, the central smoke machine system 100, and the computer-readable storage medium in the embodiments of the present invention. To avoid redundancy, they will not be elaborated in detail here.

[0137] In one implementation, the self-calibration method implemented by the computer program when executed by the processor 24 includes the following steps:

[0138] Step A: Turn on the smoke hood 12 on the floor to be tested;

[0139] Step B: Control the smoke hood 12 on the floor to be tested to operate at a preset air volume, which is determined by the calibration coefficient and the target air volume;

[0140] Step C: Obtain the actual air volume of the smoke hood 12 on the floor to be tested;

[0141] Step D: If the relationship between the target air volume and the actual air volume of the smoke hood 12 on the floor to be tested meets the preset conditions, determine the calibration coefficient as the target calibration coefficient of the smoke hood 12 on the floor to be tested.

[0142] Step E: If the relationship between the target air volume and the actual air volume of the smoke hood 12 on the floor to be tested does not meet the preset conditions, the calibration coefficient is corrected and the process returns to step B.

[0143] The aforementioned self-calibration device, central smoke hood system 100, and computer-readable storage medium can control the operation of the smoke hood 12 on the floor under test by a preset airflow determined by the calibration coefficient and the target airflow. The calibration coefficient of the floor under test is determined based on whether the relationship between the target airflow and the actual airflow of the smoke hood 12 on the floor under test meets the preset conditions. This reduces the airflow control deviation caused by the deviation between the actual aerodynamic characteristic parameters of each component and the preset calibration value, and ensures the reliability of the system's airflow control.

[0144] In summary, the technical solution of the present invention has at least the following innovative points:

[0145] ① The system can perform self-calibration:

[0146] In actual use, due to improper installation, component aging, and oil fume accumulation, the actual aerodynamic characteristics of each component will differ from the pre-calibrated values ​​in the open-loop control strategy. This difference will especially change over time, reducing the system's airflow control accuracy. Utilizing a system self-calibration method can effectively mitigate these adverse effects and ensure system control reliability.

[0147] ② Only the air volume calibration coefficient can be calibrated:

[0148] In open-loop control strategies, numerous aerodynamic parameters affect the final control result, making the number of operating conditions and computational load required to calibrate all aerodynamic parameters extremely large. However, calibrating only the airflow calibration coefficient can guarantee a certain level of calibration accuracy under conditions of minimal operating conditions and computational load.

[0149] ③ Use a movable baffle to shield the sensor (such as a pressure sensor):

[0150] The high levels of oil fumes and high temperatures inside exhaust ducts can severely impact the lifespan of sensors. Therefore, shielding the sensors with a baffle during actual user operation can significantly extend their lifespan.

[0151] ④ Consider the impact of synchronization rate on air volume calibration coefficient:

[0152] The applicability of the airflow calibration coefficient obtained under one synchronization rate may decrease under another synchronization rate, resulting in a decrease in airflow control accuracy. Therefore, it is possible to calibrate the airflow calibration coefficient under multiple synchronization rates using multiple calibration conditions, and then use linear interpolation to obtain the airflow calibration coefficient under the actual synchronization rate used by the user, thereby improving airflow control accuracy.

[0153] It is understood that a computer program includes computer program code. Computer program code can be in the form of source code, object code, executable files, or certain intermediate forms. Computer-readable storage media can include: any entity or device capable of carrying computer program code, recording media, USB flash drives, external hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), and software distribution media, etc. The processor can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0154] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0155] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A self-calibration method for a central smoke machine system, characterized in that, include: Control the smoke hood of the floor to be tested to turn on; The smoke hood on the floor under test is controlled to operate at a preset air volume, which is determined by a calibration coefficient and a target air volume. Obtain the actual air volume of the smoke hood on the floor to be tested; If the relationship between the target air volume and the actual air volume of the smoke hood on the floor to be tested meets the preset conditions, the calibration coefficient is determined as the target calibration coefficient of the smoke hood on the floor to be tested. If the relationship between the target air volume and the actual air volume of the smoke hood on the floor under test does not meet the preset conditions, the calibration coefficient is corrected, and the process returns to the step of controlling the smoke hood on the floor under test to operate at the preset air volume. The control of the smoke hood on the floor under test includes: All smoke hoods on the floors to be tested are grouped according to the preset synchronization rate; Under the preset synchronization rate, control all the smoke hoods on the floors to be tested in each group to be turned on; Different preset synchronization rates correspond to different calibration coefficients; The self-calibration method includes: Obtain the current synchronization rate and determine the synchronization rate range to which the current synchronization rate belongs, wherein the synchronization rate range is determined by a plurality of preset synchronization rates; Based on the synchronization rate range and the current synchronization rate, determine the current calibration coefficient corresponding to the current synchronization rate; The current calibration coefficient α(i) of each floor under the current synchronization rate S_real is obtained by linear interpolation, as shown in the following formula: The synchronization rate range is [S] n , S n+1 ], S n+1 S represents the upper limit of the synchronization rate. n α is the lower limit of the synchronization rate. n+1 (i) is the first calibration coefficient corresponding to the upper limit synchronization rate, α n (i) is the second calibration coefficient corresponding to the lower limit synchronization rate.

2. The self-calibration method according to claim 1, characterized in that, The preset conditions include the ratio between the target air volume and the actual air volume being within a preset range.

3. The self-calibration method according to claim 1, characterized in that, Based on the synchronization rate range and the current synchronization rate, the current calibration coefficient corresponding to the current synchronization rate is determined as follows: Obtain the upper and lower limits of the synchronization rate range, the first calibration coefficient corresponding to the upper limit synchronization rate, and the second calibration coefficient corresponding to the lower limit synchronization rate; The current calibration coefficient is determined based on the upper limit synchronization rate, the lower limit synchronization rate, the first calibration coefficient, the second calibration coefficient, and the current synchronization rate. The current calibration coefficient is determined by segmenting the synchronization rate interval into three segments. When the current synchronization rate is in the first segment, which is closer to the lower limit synchronization rate, the current calibration coefficient can be the second calibration coefficient corresponding to the lower limit synchronization rate. When the current synchronization rate is in the second segment, which is closer to the upper limit synchronization rate, the current calibration coefficient can be the first calibration coefficient corresponding to the upper limit synchronization rate. When the current synchronization rate is in the third segment, the current synchronization rate can be determined using an interpolation method, with the third segment located between the first and second segments.

4. The self-calibration method according to claim 1, characterized in that, The process of obtaining the actual air volume of the smoke hood on the floor to be tested includes: The actual air volume of the smoke hood on the floor under test is obtained using the measurement data from the sensor.

5. The self-calibration method according to claim 4, characterized in that, The sensor is installed in a branch exhaust duct that connects to the public exhaust duct and the smoke hood on the floor to be tested. The sensor is shielded by a movable baffle. During the self-calibration process, the baffle is removed so that the sensor can collect the data required to obtain the actual air volume. After the self-calibration process is completed, the baffle shields the sensor.

6. The self-calibration method according to claim 4, characterized in that, The sensor's measurement data includes at least one of the following: static pressure at the floor exhaust fan outlet, static pressure at the inlet of the electronically controlled valve, and the power of the floor exhaust fan.

7. A self-calibration device for a central smoke machine system, characterized in that, include: processor; and A memory storing a computer program that, when executed by the processor, implements the steps of the self-calibration method for the central smoke machine system according to any one of claims 1-6.

8. A central smoke-making system, characterized in that, Includes the self-calibration device of the central smoke machine system as described in claim 7.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the self-calibration method for the central smoke machine system according to any one of claims 1-6.

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