Fan control system, fan control method and control device

Abstract

This application provides a fan control system, a control method for the fan control system, and a control device for the control system. The system includes: a first gas sensor located at a first position on the tunnel face, used to detect a first gas concentration at the first position; a second gas sensor located at a second position in the tunnel at a preset distance from the first gas sensor, used to detect a second gas concentration at the second position; a local ventilator located in the intake airway of the tunnel, used to supply air to the tunnel face; and a controller communicatively connected to the first gas sensor, the second gas sensor, and the local ventilator, used to determine a gas dilution rate based on the first and second gas concentrations, and to control the airflow output by the local ventilator based on the gas dilution rate. This solution can solve the problem of low efficiency in airflow control of local ventilators in the prior art.

Description

Technical Field

[0001] This application relates to the field of local ventilation fan control technology, and more specifically, to a fan control system, a control method for the fan control system, and a control device for the fan control system. Background Technology

[0002] Mine ventilation is crucial to underground safety at all times. In recent years, with the continuous increase in mine depth and roadway length, higher requirements have been placed on mine ventilation. First, the air supply length is getting longer and the roadways are becoming more complex. Second, traditional ventilation systems can no longer meet the construction requirements of smart mines.

[0003] Tunneling is a crucial part of mine production. Because through-flow air cannot be formed in tunneling roadways, the ventilation method at the tunneling face differs from other roadways, generally employing a forced-draft ventilation system powered by local fans. This method has advantages such as good performance and a long effective airflow distance; however, return air passes through the tunneling roadway, resulting in polluted air within the roadway. Furthermore, insufficient air supply can seriously endanger the health and safety of workers. A well-designed and reliable ventilation system in tunneling roadways not only ensures worker safety and improves the working environment but also reduces energy consumption and increases tunneling efficiency.

[0004] Local ventilation fans serve not only to provide fresh air for workers, but more importantly, to dilute and remove methane released from the coal seam during tunneling. However, the efficiency of airflow control in local ventilation fans is currently low. Summary of the Invention

[0005] The main objective of this application is to provide a fan control system, a fan control method, and a control device for the fan control system, so as to at least solve the problem of low efficiency in the air volume control of local ventilators in the prior art.

[0006] To achieve the above objectives, according to one aspect of this application, a fan control system is provided, comprising: a first gas sensor located at a first position on the tunneling face of a roadway, the first gas sensor being used to detect a first gas concentration at the first position; a second gas sensor located at a second position in the roadway at a preset distance from the first gas sensor, the second gas sensor being used to detect a second gas concentration at the second position; a local ventilator located in the intake airway of the roadway, the local ventilator being used to supply air to the tunneling face of the roadway; and a controller communicatively connected to the first gas sensor, the second gas sensor, and the local ventilator, the controller being used to determine a gas dilution rate based on the first gas concentration and the second gas concentration, and to control the air volume output by the local ventilator based on the gas dilution rate, wherein the gas dilution rate is the rate of change of gas diffusion, and the gas dilution rate is proportional to the air volume output by the local ventilator.

[0007] Optionally, the fan control system further includes: a duct, the air inlet of which is connected to the local ventilator, the air outlet of which is located at the tunneling face of the roadway, the duct being used to guide airflow along the direction of the duct to the tunneling face of the roadway; and an air volume sensor located in the duct, the air volume sensor being communicatively connected to the controller, the air volume sensor being used to detect the air volume output by the local ventilator.

[0008] Optionally, the fan control system further includes a frequency converter, which is communicatively connected to both the local ventilator and the controller, and the frequency converter is used to adjust the air outlet speed of the local ventilator.

[0009] According to another aspect of this application, a control method for a fan control system is provided, the method comprising: obtaining a first gas content and a second gas content, wherein the gas content is the proportion of gas volume contained in a unit volume, the first gas content is calculated based on a first gas concentration, and the second gas content is calculated based on a second gas concentration; when the first gas concentration is greater than a first threshold and the first gas concentration is less than or equal to a second threshold, determining a gas dilution rate based on the first gas content and the second gas content, wherein the first threshold is less than the second threshold; adjusting the air volume output by the local ventilator at least based on the dilution rate difference between the gas dilution rate and a target gas dilution rate, wherein the dilution rate difference is proportional to the air volume output by the local ventilator.

[0010] Optionally, obtaining the first gas content and the second gas content includes: calculating the first gas content according to a first formula, wherein the first formula is: Q1=K×S×L×T1, Q1 represents the first gas content, K represents a correction coefficient, S represents the cross-sectional area of ​​the roadway, L represents the distance between the first gas sensor and the second gas sensor, and T1 represents the first gas concentration; and calculating the second gas content according to a second formula, wherein the second formula is: Q2=K×S×L×T2, Q2 represents the second gas content, and T2 represents the second gas concentration.

[0011] Optionally, determining the gas dilution rate based on the first gas content and the second gas content includes: calculating the gas dilution rate according to a third formula, wherein the third formula is:

[0012]

[0013] ε represents the gas dilution rate.

[0014] Optionally, the fan control system further includes a duct, an air volume sensor, and a frequency converter. The air inlet of the duct is connected to the local ventilator, and the air outlet of the duct is located at the tunneling face of the roadway. The duct guides airflow along its direction to the tunneling face. The air volume sensor is located in the duct and is communicatively connected to the controller. The air volume sensor detects the air volume output by the local ventilator. The frequency converter is communicatively connected to both the local ventilator and the controller. The frequency converter adjusts the outlet speed of the local ventilator, at least based on the gas dilution rate and the target gas dilution rate. Adjusting the air volume output by the local ventilator based on the dilution rate difference includes: determining the required air volume based on the dilution rate difference, wherein the dilution rate difference is proportional to the required air volume; determining the air volume deviation and the air volume deviation change rate based on the required air volume and the actual air volume, wherein the actual air volume is the air volume output by the local ventilator monitored by the air volume sensor; inputting the required air volume, the actual air volume, the air volume deviation, and the air volume deviation change rate to a fuzzy controller to obtain the output signal of the fuzzy controller; outputting the output signal of the fuzzy controller to the frequency converter to control the frequency converter to adjust the air outlet speed of the local ventilator based on the output signal.

[0015] Optionally, determining the airflow deviation and the rate of change of airflow deviation based on the required airflow and the actual airflow includes: calculating the airflow deviation and the rate of change of airflow deviation according to a fourth formula, wherein the fourth formula is:

[0016]

[0017] E represents the airflow deviation, and F represents the actual airflow. Ec represents the required air volume, and Ec represents the rate of change of the air volume deviation. t The air volume deviation at time t represents the time at which the rate of change of the air volume deviation is calculated.

[0018] Optionally, after obtaining the first gas content and the second gas content, the method further includes: when the first gas concentration is less than or equal to the first threshold, the air volume output by the local ventilation fan is determined according to the minimum requirement based on relevant information such as the tunneling roadway, wherein the roadway information includes the roadway length, tunneling speed, and number of personnel at the working face; when the first gas concentration is greater than the second threshold and the first gas concentration is less than or equal to the third threshold, the ventilation fan control system is controlled to suspend operation and the ventilation system is checked, wherein the second threshold is less than the third threshold; when the first gas concentration is greater than the third threshold, the tunneling equipment at the tunneling face of the roadway is immediately powered off and stops operation.

[0019] According to another aspect of this application, a control device for a fan control system is provided, the device comprising: an acquisition unit for acquiring a first gas content and a second gas content, wherein the gas content is the proportion of gas volume contained in a unit volume, the first gas content is calculated based on a first gas concentration, and the second gas content is calculated based on a second gas concentration; a determination unit for determining a gas dilution rate based on the first gas content and the second gas content when the first gas concentration is greater than a first threshold and the first gas concentration is less than or equal to a second threshold, wherein the first threshold is less than the second threshold; and a first control unit for adjusting the air volume output by the local ventilator based at least on the dilution rate difference between the gas dilution rate and a target gas dilution rate, wherein the dilution rate difference is proportional to the air volume output by the local ventilator.

[0020] By applying the technical solution of this application, gas sensors are installed at the tunnel face (working face) and at locations further away from the tunnel face to detect the gas concentration at different locations. Since the sensors are at a certain distance, the gas dilution rate can be determined. The dilution rate is the change in gas during diffusion. This allows for the determination of real-time gas changes, and the ventilation fan can be controlled based on this dilution rate. Compared with existing solutions, adjusting the air volume based on real-time changes allows for pre-adjustment of the air volume when the gas level is high or low. This avoids lag in air volume control, ensures higher accuracy, and improves the efficiency of air volume control. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0022] Figure 1 A schematic diagram of the structure of the wind turbine control system of this application is shown;

[0023] Figure 2 A hardware structure block diagram of a mobile terminal for executing a control method of a wind turbine control system according to an embodiment of this application is shown.

[0024] Figure 3 A schematic flowchart of a control method for a wind turbine control system according to an embodiment of this application is shown.

[0025] Figure 4 A flowchart illustrating another control method for a wind turbine control system according to this application is shown;

[0026] Figure 5 A schematic diagram of the fuzzy control principle of air volume in this application is shown;

[0027] Figure 6 A structural block diagram of a control device for a wind turbine control system provided according to an embodiment of this application is shown.

[0028] The above figures include the following reference numerals:

[0029] 102. Processor; 104. Memory; 106. Transmission equipment; 108. Input / output device; 10. First gas sensor; 11. Tunneling face; 12. Second gas sensor; 13. Local ventilation fan; 14. Intake airway; 15. Controller; 16. Ventilation duct; 17. Air volume sensor; 18. Return airway; 19. Return airflow. Detailed Implementation

[0030] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0031] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0032] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0033] As described in the background section, the efficiency of airflow control for local ventilation fans in the prior art is relatively low. To solve the above problems, embodiments of this application provide a fan control system, a control method for the fan control system, and a control device for the fan control system.

[0034] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0035] This application provides a wind turbine control system, such as Figure 1 As shown, the system includes:

[0036] The first gas sensor 10 is located at a first position on the tunnel face 11. The first gas sensor is used to detect the first gas concentration at the first position.

[0037] The second gas sensor 12 is located at a second position in the aforementioned roadway at a preset distance from the first gas sensor, and the second gas sensor is used to detect the second gas concentration at the second position.

[0038] Local ventilation fan 13 is located in the intake airway 14 of the aforementioned roadway, and the local ventilation fan is used to supply air to the aforementioned tunneling face of the aforementioned roadway.

[0039] The controller 15 is communicatively connected to the first gas sensor, the second gas sensor, and the local ventilator. The controller is used to determine the gas dilution rate based on the first gas concentration and the second gas concentration, and to control the air volume output by the local ventilator based on the gas dilution rate. The gas dilution rate is the rate of change of gas diffusion, and the gas dilution rate is directly proportional to the air volume output by the local ventilator.

[0040] In the aforementioned system, gas sensors are installed at both the tunnel face (working face) and at locations further away from the tunnel face to detect gas concentrations at different locations. Since the sensors are at a certain distance, the gas dilution rate can be determined. The dilution rate is the change in gas concentration during diffusion. This allows for the determination of real-time gas changes, and the ventilation fan can be controlled based on this dilution rate. Compared to existing solutions, adjusting the air volume based on real-time changes allows for pre-emptive adjustments when gas levels are high or low, avoiding lag in air volume control and ensuring higher accuracy, thereby improving the efficiency of air volume control.

[0041] To efficiently and safely discharge methane gas and prevent the phenomenon of "blowing it out with a single gust of wind," relevant scientific researchers and technical engineers have started with local ventilation fans, controlling methane emissions by changing the air supply volume, and have achieved some results and application value. However, there are still some shortcomings in the air volume control methods, such as the lag in air volume control, the accuracy of air volume control, and the stability of air volume control.

[0042] Therefore, this application proposes an effective and stable air volume control scheme. By analyzing the gas dilution rate and combining it with a variable frequency local ventilation fan, a local ventilation fan air volume control method based on the gas dilution rate is formed. This method is of great significance for the safe discharge of harmful gases such as gas, improving the working environment, effectively ensuring the stable operation of the ventilation system, and the safe production management of coal mines.

[0043] Specifically, two high-precision gas sensors can be installed near the tunneling face, namely the first gas sensor and the second gas sensor. The first gas sensor can be placed 20-25m away from the tunneling face.

[0044] In one specific embodiment, such as Figure 1 As shown, the above-mentioned fan control system also includes a duct 16 and an air volume sensor 17. The air inlet of the duct is connected to the local ventilator, and the air outlet of the duct is located at the tunneling face of the roadway. The duct is used to guide the airflow along the direction of the duct to the tunneling face of the roadway. The air volume sensor is located in the duct and is communicatively connected to the controller. The air volume sensor is used to detect the air volume output by the local ventilator.

[0045] In this solution, an air volume sensor is installed inside the duct of the local ventilation fan. The air volume sensor can be installed at the end of the duct. The duct can effectively guide the airflow and reduce the airflow resistance, thereby improving ventilation efficiency and ensuring the air quality at the working face. The air volume sensor can monitor the air volume at the end of the duct in real time, so that the ventilation situation at the working face can be understood in a timely manner, and ventilation problems can be detected and solved in a timely manner.

[0046] In some embodiments, such as Figure 1 As shown, the above-mentioned fan control system also includes a frequency converter, which is communicatively connected to the above-mentioned local ventilator and the above-mentioned controller. The frequency converter is used to adjust the air outlet speed of the above-mentioned local ventilator.

[0047] In this solution, the frequency converter can adjust the motor speed according to actual needs, thereby controlling the fan's outlet air speed. When demand decreases, the frequency converter can reduce the motor speed, reducing energy consumption. The frequency converter can achieve precise speed control, accurately adjusting the fan's outlet air speed according to actual needs to meet different ventilation requirements.

[0048] Specifically, within the fan control system, a fuzzy controller is set up using a micro control chip, which regulates the air volume and its stability through feedback adjustment technology and frequency conversion technology.

[0049] Specifically, such as Figure 1 As shown, the roadways include the return airway 18 and the intake airway. The return airway is mainly used for returning air, that is, bringing fresh air into the working face and then expelling the stale air generated by personnel breathing and equipment operation outside the mine. The intake airway is called the main intake airway, which is used for the ventilation of the entire mine or one wing of the mine; the main intake airway, which is used for the ventilation of several mining areas; the mining area intake airway, which is used for the ventilation of one mining area; and the working face intake airway, which is used for the ventilation of one working face. These two roadways are key components of the mine ventilation system and are of great significance for ensuring the safety and health of miners and improving the mine's production efficiency.

[0050] like Figure 1 As shown, an air volume sensor is installed at the end of the ventilation duct. The air delivered by the local ventilation fan is blown into the face of the tunnel through the ventilation duct, thus forming a return airflow 19.

[0051] The methods and embodiments provided in this application can be executed on a mobile terminal, computer terminal, or similar computing device. Taking running on a mobile terminal as an example, Figure 2 This is a hardware structure block diagram of a mobile terminal for a control method of a wind turbine control system according to an embodiment of the present invention. Figure 2 As shown, a mobile terminal may include one or more ( Figure 2 Only one is shown in the diagram. A processor 102 (which may include, but is not limited to, a microprocessor MCU or a programmable logic device FPGA, etc.) and a memory 104 for storing data are also shown. The mobile terminal may further include a transmission device 106 for communication functions and an input / output device 108. Those skilled in the art will understand that... Figure 2The structure shown is for illustrative purposes only and does not limit the structure of the mobile terminal described above. For example, the mobile terminal may also include components that are more... Figure 2 The more or fewer components shown, or having the same Figure 2 The different configurations shown.

[0052] The memory 104 can be used to store computer programs, such as application software programs and modules, like the computer program corresponding to the device information display method in this embodiment of the invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, thereby implementing the above-described method. The memory 104 may include high-speed random access memory and non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include memory remotely located relative to the processor 102, and these remote memories can be connected to the mobile terminal via a network. Examples of the aforementioned networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof. The transmission device 106 is used to receive or send data via a network. Specific examples of the aforementioned networks may include wireless networks provided by the mobile terminal's communication provider. In one example, the transmission device 106 includes a network interface controller (NIC), which can be connected to other network devices via a base station to communicate with the Internet. In one example, the transmission device 106 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0053] This embodiment provides a control method for a wind turbine control system that runs on a mobile terminal, computer terminal, or similar computing device. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Also, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0054] Figure 3 This is a flowchart illustrating a control method for a wind turbine control system according to an embodiment of this application. Figure 3 As shown, the method includes the following steps:

[0055] Step S201: Obtain the first gas content and the second gas content, wherein the gas content is the proportion of gas volume contained in a unit volume, the first gas content is calculated based on the first gas concentration, and the second gas content is calculated based on the second gas concentration.

[0056] Specifically, two gas sensors can be installed in the roadway to detect gas concentrations at different locations. By measuring the gas concentration, the gas content in a specific volume or mass can be calculated. Specifically, gas concentration refers to the amount of gas per unit volume or mass, while gas content refers to the total amount of gas in a specific volume or mass. By measuring the gas concentration, the gas content in a specific area or medium can be calculated, thus understanding the distribution and accumulation of gas and providing important reference for safe coal mine production.

[0057] Step S202: When the first gas concentration is greater than the first threshold and the first gas concentration is less than or equal to the second threshold, the gas dilution rate is determined based on the first gas content and the second gas content, wherein the first threshold is less than the second threshold.

[0058] Specifically, the first threshold can be 0 or other values. The second threshold can be 1% or other values. First, determine the first gas concentration detected by the first gas sensor. When the first gas concentration is greater than 0 and less than or equal to 1%, the airflow of the local ventilation fan should change with the gas concentration, i.e., determine the gas dilution rate. Otherwise, exit the airflow control scheme and supply air according to other models.

[0059] The first gas concentration is used for judgment because the first gas sensor is close to the tunneling face, and most of the gas in the tunnel is released during blasting or tunneling. That is, the high concentration of undiluted gas is detected first by the first gas sensor. Therefore, the first gas concentration detected by the first gas sensor is used for judgment.

[0060] Step S203: Adjust the air volume output by the local ventilator based at least on the difference between the above-mentioned gas dilution rate and the target gas dilution rate, wherein the difference in dilution rate is proportional to the air volume output by the local ventilator.

[0061] Specifically, the gas dilution rate is calculated using the first gas concentration and the second gas concentration, and a target gas dilution rate is set. By analyzing the error between the actual gas dilution rate and the target dilution rate, the air volume of the local ventilation fan can be adjusted. When the actual dilution rate does not reach the target value, the air volume should be increased, and vice versa.

[0062] The calculation time and adjustment ratio for each required airflow adjustment can be modified through the program.

[0063] This embodiment allows for the determination of gas content within a given space using gas concentration data obtained from a gas sensor. This, in turn, determines the gas dilution rate, which reflects the change in gas concentration during diffusion. This enables the determination of real-time gas variations, allowing for the control of ventilation fan output based on the dilution rate. Compared to existing solutions, adjusting airflow based on real-time changes allows for pre-emptive adjustments when gas levels are high or low, avoiding lag in airflow control and ensuring higher accuracy, thus improving the efficiency of airflow control.

[0064] Specifically, by analyzing the changes in gas dilution rate over a certain period of time, the system can automatically control the air volume in the tunneling roadway, eliminate the safety hazards of gas accumulation, improve the air quality of the tunneling face and roadway, provide stable airflow, achieve low-energy operation of local ventilation fans, and provide life safety protection for underground workers.

[0065] The controller of the wind turbine control system described in this application can be the controller in the wind turbine control system.

[0066] In the specific implementation process, obtaining the first gas content and the second gas content can be achieved through the following steps: Calculating the first gas content according to a first formula, where the first formula is: Q1 = K × S × L × T1, Q1 represents the first gas content, K represents a correction coefficient, S represents the cross-sectional area of ​​the roadway, L represents the distance between the first gas sensor and the second gas sensor, and T1 represents the first gas concentration; Calculating the second gas content according to a second formula, where the second formula is: Q2 = K × S × L × T2, Q2 represents the second gas content, and T2 represents the second gas concentration. The above formulas are merely exemplary, and any variations of the formulas fall within the protection scope of this application.

[0067] In this scheme, gas will diffuse in different areas, and the diffusion of gas will be different depending on the distance and area. Therefore, the gas content can be calculated based on the distance and area. This embodiment can obtain a more accurate gas content, and then the air volume can be controlled more accurately and efficiently based on the gas content.

[0068] Specifically, two gas sensors are placed near the tunneling face, with a distance of L between them, typically 5 to 10 meters.

[0069] In the specific implementation process, the gas dilution rate is determined based on the first gas content and the second gas content, which can be achieved through the following steps: Calculate the gas dilution rate according to the third formula, wherein the third formula is:

[0070]

[0071] ε represents the gas dilution rate described above. The above formula is merely exemplary, and any variations of the formula fall within the scope of protection of this application.

[0072] In this scheme, the concentration difference and the ratio of the second gas concentration can be calculated to determine the dilution rate of gas in the working face. This allows for the calculation of the dilution rate between two gas sensors within the cross-sectional area of ​​the roadway, thus determining the change in gas concentration. This embodiment can obtain a relatively accurate gas dilution rate.

[0073] Specifically, Q1 can also represent the average gas content at the location of the first gas sensor within a certain time period. The average refers to the average area or the average time. Q2 can also represent the average gas content at the location of the second gas sensor within a certain time period. The average refers to the average area or the average time.

[0074] To more efficiently and accurately adjust the airflow output of the local ventilation fan, the aforementioned fan control system of this application further includes a duct, an airflow sensor, and a frequency converter. The air inlet of the duct is connected to the local ventilation fan, and the air outlet of the duct is located at the excavation face of the roadway. The duct guides the airflow along its direction to the excavation face of the roadway. The airflow sensor is located in the duct and is communicatively connected to the controller. The airflow sensor detects the airflow output of the local ventilation fan. The frequency converter is communicatively connected to both the local ventilation fan and the controller. The frequency converter adjusts the outlet speed of the local ventilation fan, at least according to the gas dilution rate and the target... The adjustment of the air volume output by the local ventilation fan based on the dilution rate difference of the standard gas dilution rate can be achieved through the following steps: determining the required air volume based on the dilution rate difference, wherein the dilution rate difference and the required air volume are directly proportional; determining the air volume deviation and the rate of change of the air volume deviation based on the required air volume and the actual air volume, wherein the actual air volume is the air volume output by the local ventilation fan monitored by the air volume sensor; inputting the required air volume, the actual air volume, the air volume deviation, and the rate of change of the air volume deviation into a fuzzy controller to obtain the output signal of the fuzzy controller; outputting the output signal of the fuzzy controller to the frequency converter to control the frequency converter to adjust the air outlet speed of the local ventilation fan based on the output signal.

[0075] In this scheme, fuzzy control technology can be used. The gas dilution rate and average air volume over a certain period of time are taken as inputs. The error relationship between the actual gas dilution rate and the set target dilution rate is analyzed to adjust the required air volume. The required air volume, actual air volume, air volume deviation, and air volume deviation change rate are then input to the fuzzy controller. Through fuzzy analysis, a suitable frequency adjustment degree of the frequency converter is obtained as the output information source. This output signal is sent to the frequency converter to adjust the speed of the local ventilation fan, thereby achieving stable control of the air volume.

[0076] Specifically, for average air volume, this includes deviation and the rate of change of deviation.

[0077] By deploying two gas sensors in the return airway of the tunneling face and calculating the gas dilution rate within the roadway, the air supply volume is adjusted based on changes in the gas dilution rate. Fuzzy control technology is used to classify frequency adjustment levels, and a frequency converter is then used to regulate the speed of the variable frequency fan, achieving control over both air volume and its stability. This method facilitates efficient gas emission, prevents gas exceedances, and enables low-energy operation of the ventilation fan, providing strong support for establishing green mines.

[0078] The controller 8 incorporates a fuzzy controller within its internal control chip. It uses fuzzy conditional language to construct specific fuzzy rules, establishing a fuzzy relationship between airflow and the frequency change of the inverter. By outputting a frequency adjustment value to the inverter, the speed of the local ventilation fan is ultimately adjusted, thereby achieving automatic airflow control.

[0079] In some embodiments, the airflow deviation and the rate of change of airflow deviation are determined based on the required airflow and the actual airflow. This can be achieved through the following steps: calculating the airflow deviation and the rate of change of airflow deviation according to the fourth formula, wherein the fourth formula is:

[0080]

[0081] E represents the aforementioned airflow deviation, and F represents the aforementioned actual airflow. Ec represents the required air volume, and Ec represents the rate of change of the air volume deviation. t Let t represent the airflow deviation at time t, where t represents the time at which the rate of change of the airflow deviation is calculated. The above formula is merely exemplary, and any modifications to the formula fall within the scope of protection of this application.

[0082] This solution provides a specific method for calculating airflow deviation and deviation change rate. By using the method provided in this embodiment, airflow deviation and deviation change rate can be determined more accurately, thus enabling more efficient fuzzy control.

[0083] Fuzzy controllers are implemented in micro control systems through application software programming.

[0084] The fuzzy controller can fuzzify the input quantity and generate a fuzzy subset on a certain universe of discourse. Specifically, the gas dilution rate deviation and the deviation change rate are divided into multiple fuzzy subsets. Specifically, the two universes of discourse of deviation E and deviation change rate Ec are divided into 7 levels, namely {NB, NM, NS, ZO, PS, PM, PB}, which represent {negative large, negative medium, negative small, zero, positive small, positive medium, positive large} respectively.

[0085] The fuzzy controller can fuzzify the output, that is, divide the frequency adjustment degree U of the fan into multiple fuzzy subsets. Specifically, the frequency adjustment degree U is divided into 9 levels, namely {-8, -6, -4, -2, 0, 2, 4, 6, 8}, which respectively represent {decreasing by 8Hz, decreasing by 6Hz, decreasing by 4Hz, decreasing by 2Hz, remaining unchanged, increasing by 2Hz, increasing by 4Hz, increasing by 6Hz, and increasing by 8Hz}.

[0086] Fuzzy controllers construct specific fuzzy rules using fuzzy conditional language to establish fuzzy relationships between input and output information sources.

[0087] In some embodiments, after obtaining the first gas concentration and the second gas concentration, the method further includes the following steps: when the first gas concentration is less than or equal to the first threshold, the air volume output by the local ventilation fan is set to the minimum requirement based on relevant information such as the tunneling roadway, wherein the roadway information includes the roadway length, tunneling speed, and number of personnel at the working face; when the first gas concentration is greater than the second threshold and less than or equal to the third threshold, the fan control system is controlled to suspend operation and the ventilation system is checked, wherein the second threshold is less than the third threshold; when the first gas concentration is greater than the third threshold, the tunneling equipment at the tunneling face of the roadway is immediately powered off and stops operation.

[0088] In this scheme, if the first gas concentration is less than or equal to the first threshold, then air can be supplied according to other air volume models. If the first gas concentration is greater than the second threshold and less than or equal to the third threshold, it is necessary to check the ventilation system. If sensor failure, airflow short circuit, or recirculation occurs, and if the first gas concentration is greater than the third threshold, then the gas concentration is high, and the coal mining equipment at the working face should be immediately powered off. At this time, it is necessary to evacuate personnel from the working face to ensure their safety. In this way, ventilation can be controlled according to different gas concentrations, thereby further solving the problem of low efficiency in air volume control of local ventilation fans.

[0089] Specifically, the third threshold can be 1.5%, or other values.

[0090] The proposed solution uses two gas concentration sensors to calculate the gas dilution rate in real time over a certain period. It also analyzes the error relationship between the calculated and target dilution rates to adjust the required air volume. Furthermore, it uses fuzzy control technology and frequency conversion regulation technology to adjust the operating frequency of the fan, thereby controlling the air volume and its stability. This achieves real-time matching between gas concentration changes and air supply volume, efficiently and promptly discharging gas and polluted gases from the tunnel. On the other hand, it avoids the fan operating in an ineffective high-frequency range, allowing the local ventilation fan to operate in a more energy-efficient manner and effectively control the air volume.

[0091] To enable those skilled in the art to better understand the technical solution of this application, the implementation process of the control method of the wind turbine control system of this application will be described in detail below with reference to specific embodiments.

[0092] This embodiment relates to a specific control method for a wind turbine control system, such as... Figure 4 As shown, it includes the following steps:

[0093] Step S1: First, set a time period t and obtain the average gas concentrations T1 and T2 within that time period;

[0094] Step S2: Determine the air volume control. If T1>0, the required air volume control needs to be performed; otherwise, maintain the air volume stability. At the same time, if T1 exceeds the safety limit, the ventilation system needs to be checked.

[0095] Step S3: Calculate the gas dilution rate based on the values ​​of T1 and T2, combined with parameters such as air volume, and set a target dilution rate in the control system based on environmental parameters;

[0096] Step S4: Adjust the required air volume by analyzing the error between the actual dilution rate and the target dilution rate;

[0097] Step S5: Using the actual air volume as the control target, and employing fuzzy control technology, the frequency adjustment degree is output as a signal to adjust the frequency of the inverter, thereby achieving the control of air volume and air volume stability.

[0098] The principle of airflow fuzzy control in this application is as follows: Figure 5 As shown, it includes the following steps:

[0099] Step (1): Calculate the deviation E and the rate of change of deviation Ec based on the required air volume and the actual air volume;

[0100] Step (2): Based on the actual application of the fan and operational experience, fuzzify the deviation E, the deviation change rate Ec, and the frequency adjustment degree U.

[0101] Step (3): Set fuzzy control rules according to the rules of air volume regulation;

[0102] Step (4): Fuzzy operation. According to the fuzzy rules, the output quantity of fuzzy control is obtained, namely the frequency adjustment degree U.

[0103] Step (5): The output data is transmitted to the frequency converter and the frequency converter fan is driven to adjust the speed, which ultimately affects the air volume control of the tunnel working face.

[0104] Step (6): If the values ​​of T1, T2 and F change, that is, the actual gas dilution rate changes, then the air volume deviation and the rate of change of deviation will be recalculated, and a new air volume regulation will be carried out.

[0105] Further, in step (2), the universe of discourse of the deviation E is divided into [-60, 60], and the universe of discourse of the deviation change rate Ec (when t is 10s) is divided into [-3, 3]. At the same time, the two universes are divided into 7 levels, namely {NB, NM, NS, ZO, PS, PM, PB}, which respectively represent {negative large, negative medium, negative small, zero, positive small, positive medium, positive large}.

[0106] Furthermore, in step (2), the frequency adjustment degree U is divided into 9 levels, namely {-8, -6, -4, -2, 0, 2, 4, 6, 8}, which respectively represent {decreasing by 8Hz, decreasing by 6Hz, decreasing by 4Hz, decreasing by 2Hz, remaining unchanged, increasing by 2Hz, increasing by 4Hz, increasing by 6Hz, increasing by 8Hz}.

[0107] Furthermore, in step (4), the fuzzy rules can be determined based on the membership relationship between the universes of discourse of each input quantity and the universe of discourse of the output quantity, such as:

[0108] IF E=NB and Ec=NB THEN U=8;

[0109] IF E=ZO and Ec=PS THEN U=-2;

[0110] Furthermore, in step (5), before adjusting the fan frequency, it is necessary to determine whether there is room for further frequency adjustment of the fan. If the limit value has been reached, the air volume cannot be controlled, and the staff is reminded to take other control measures.

[0111] As can be seen from the above, the embodiments of the present invention can adjust the frequency of the frequency converter according to the actual gas dilution rate, thereby adjusting the air supply volume. On the one hand, it can efficiently and timely discharge gas and polluted gas in the tunnel, and on the other hand, it can avoid the fan from operating in the ineffective high-frequency range, realize the real-time matching of gas concentration and air supply volume, and achieve local ventilation fan air volume control in a more energy-efficient way.

[0112] This application also provides a control device for a wind turbine control system. It should be noted that the control device for the wind turbine control system in this application can be used to execute the control method for the wind turbine control system provided in this application. This device is used to implement the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0113] The control device of the fan control system provided in the embodiments of this application will be described below.

[0114] Figure 6 This is a structural block diagram of a control device for a fan control system according to an embodiment of this application. Figure 6 As shown, the device includes:

[0115] The acquisition unit 100 is used to acquire a first gas content and a second gas content, wherein the gas content is the proportion of gas volume contained in a unit volume, the first gas content is calculated based on the first gas concentration, and the second gas content is calculated based on the second gas concentration.

[0116] The determining unit 200 is configured to determine the gas dilution rate based on the first gas content and the second gas content when the first gas concentration is greater than a first threshold and the first gas concentration is less than or equal to a second threshold, wherein the first threshold is less than the second threshold.

[0117] The first control unit 300 is used to adjust the air volume output by the local ventilator based at least on the dilution rate difference between the gas dilution rate and the target gas dilution rate, wherein the dilution rate difference is proportional to the air volume output by the local ventilator.

[0118] This embodiment allows for the determination of gas content within a given space using gas concentration data obtained from a gas sensor. This, in turn, determines the gas dilution rate, which reflects the change in gas concentration during diffusion. This enables the determination of real-time gas variations, allowing for the control of ventilation fan output based on the dilution rate. Compared to existing solutions, adjusting airflow based on real-time changes allows for pre-emptive adjustments when gas levels are high or low, avoiding lag in airflow control and ensuring higher accuracy, thus improving the efficiency of airflow control.

[0119] In specific implementation, the acquisition unit includes a first calculation module and a second calculation module. The first calculation module is used to calculate the first gas content according to a first formula, wherein the first formula is: Q1=K×S×L×T1, where Q1 represents the first gas content, K represents a correction coefficient, S represents the cross-sectional area of ​​the roadway, L represents the distance between the first gas sensor and the second gas sensor, and T1 represents the first gas concentration. The second calculation module is used to calculate the second gas content according to a second formula, wherein the second formula is: Q2=K×S×L×T2, where Q2 represents the second gas content and T2 represents the second gas concentration. The above formulas are merely exemplary, and any variations of the formulas fall within the protection scope of this application.

[0120] In this scheme, as the air volume changes, the gas is distributed in the tunnel at different concentrations. Therefore, the gas content in a certain space can be expressed based on the gas concentration at a certain monitoring point. This embodiment can obtain a more accurate gas content, and then the air volume can be controlled more accurately and efficiently based on the gas content.

[0121] Specifically, two gas sensors are placed near the tunneling face, with a distance of L between them, typically 5 to 10 meters.

[0122] In the specific implementation process, the determining unit includes a third calculation module, which is used to calculate the gas dilution rate according to a third formula, wherein the third formula is:

[0123]

[0124] ε represents the gas dilution rate described above. The above formula is merely exemplary, and any variations of the formula fall within the scope of protection of this application.

[0125] In this scheme, the concentration difference and the ratio of the second gas concentration can be calculated to determine the dilution rate of gas in the working face. This allows for the calculation of the dilution rate between two gas sensors within the cross-sectional area of ​​the roadway, thus determining the change in gas concentration. This embodiment can obtain a relatively accurate gas dilution rate.

[0126] To more efficiently and accurately adjust the airflow output of the local ventilation fan, the aforementioned fan control system of this application further includes a duct, an airflow sensor, and a frequency converter. The air inlet of the duct is connected to the local ventilation fan, and the air outlet of the duct is located at the tunneling face of the roadway. The duct guides the airflow along the direction of the duct to the tunneling face. The airflow sensor is located in the duct and is communicatively connected to the controller. The airflow sensor is used to detect the airflow output of the local ventilation fan. The frequency converter is communicatively connected to both the local ventilation fan and the controller. The frequency converter is used to adjust the airflow speed of the local ventilation fan. The first control unit includes a first determination... The system comprises a first determining module, a second determining module, and a processing module. The first determining module is used to determine the required air volume based on the dilution rate difference, wherein the dilution rate difference is proportional to the required air volume. The second determining module is used to determine the air volume deviation and the air volume deviation change rate based on the required air volume and the actual air volume, wherein the actual air volume is the air volume output by the local ventilator monitored by the air volume sensor. The processing module is used to input the required air volume, the actual air volume, the air volume deviation, and the air volume deviation change rate to a fuzzy controller to obtain the output signal of the fuzzy controller, and output the output signal of the fuzzy controller to the frequency converter to control the frequency converter to adjust the air outlet speed of the local ventilator based on the output signal.

[0127] In this scheme, fuzzy control technology can be used. The gas dilution rate and average air volume over a certain period of time are taken as inputs. The error relationship between the actual gas dilution rate and the set target dilution rate is analyzed to adjust the required air volume. The required air volume, actual air volume, air volume deviation, and air volume deviation change rate are then input to the fuzzy controller. Through fuzzy analysis, a suitable frequency adjustment degree of the frequency converter is obtained as the output information source. This output signal is sent to the frequency converter to adjust the speed of the local ventilation fan, thereby achieving stable control of the air volume.

[0128] In some embodiments, the second determining module includes a calculation submodule, which is used to calculate the aforementioned airflow deviation and the aforementioned airflow deviation change rate according to a fourth formula, wherein the aforementioned fourth formula is:

[0129]

[0130] E represents the aforementioned airflow deviation, and F represents the aforementioned actual airflow. Ec represents the required air volume, and Ec represents the rate of change of the air volume deviation. t Let t represent the airflow deviation at time t, where t represents the time at which the rate of change of the airflow deviation is calculated. The above formula is merely exemplary, and any modifications to the formula fall within the scope of protection of this application.

[0131] This solution provides a specific method for calculating airflow deviation and deviation change rate. By using the method provided in this embodiment, airflow deviation and deviation change rate can be determined more accurately, thus enabling more efficient fuzzy control.

[0132] In some embodiments, the above-mentioned device further includes a second control unit, a third control unit, and a fourth control unit. The second control unit is used to, after obtaining the first gas content and the second gas content, and when the first gas concentration is less than or equal to the first threshold, to output the minimum required air volume of the local ventilation fan based on relevant information such as the tunneling roadway, wherein the roadway information includes the roadway length, tunneling speed, and number of personnel at the working face; the third control unit is used to control the fan control system to suspend operation and check the ventilation system when the first gas concentration is greater than the second threshold and the first gas concentration is less than or equal to the third threshold, wherein the second threshold is less than the third threshold; the fourth control unit is used to control the tunneling equipment at the tunneling face of the roadway to immediately cut off power and stop operation when the first gas concentration is greater than the third threshold.

[0133] In this scheme, if the first gas concentration is less than or equal to the first threshold, then air can be supplied according to other air volume models. If the first gas concentration is greater than the second threshold and less than or equal to the third threshold, it is necessary to check the ventilation system. If sensor failure, airflow short circuit, or recirculation occurs, and if the first gas concentration is greater than the third threshold, then the gas concentration is high, and the coal mining equipment at the working face should be immediately powered off. At this time, it is necessary to evacuate personnel from the working face to ensure their safety. In this way, ventilation can be controlled according to different gas concentrations, thereby further solving the problem of low efficiency in air volume control of local ventilation fans.

[0134] The control device of the aforementioned wind turbine control system includes a processor and a memory. The acquisition unit, determination unit, and first control unit are all stored as program units in the memory, and the processor executes the program units stored in the memory to achieve the corresponding functions. All of the above modules are located in the same processor; alternatively, the modules may be located in different processors in any combination.

[0135] The processor contains a kernel, which retrieves the corresponding program unit from memory. One or more kernels can be configured, and adjusting kernel parameters can address the low efficiency of airflow control in existing local ventilation fans.

[0136] The memory may include non-permanent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0137] This invention provides a computer-readable storage medium that includes a stored program, wherein, when the program is executed, it controls the device containing the computer-readable storage medium to perform the control method of the wind turbine control system.

[0138] This invention provides a processor for running a program, wherein the program executes the control method of the wind turbine control system.

[0139] This invention provides a device including a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, it implements at least the control method steps of a wind turbine control system. The device described herein can be a server, PC, tablet, mobile phone, etc.

[0140] This application also provides a computer program product that, when executed on a data processing device, is suitable for performing a program that initializes a control method step having at least the following wind turbine control system.

[0141] It is obvious to those skilled in the art that the modules or steps of the present invention described above can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. They can be implemented using computer-executable program code, and thus can be stored in a storage device for execution by a computing device. In some cases, the steps shown or described can be performed in a different order than those described herein, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, the present invention is not limited to any particular combination of hardware and software.

[0142] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0143] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0144] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0145] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0146] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0147] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0148] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0149] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0150] As can be seen from the above description, the embodiments of this application achieve the following technical effects:

[0151] 1) The ventilation control system of this application is equipped with gas sensors at the tunnel face (working face) and at a distance further from the tunnel face to detect the gas concentration at different locations. Since the sensors are at a certain distance, the gas dilution rate can be determined. The dilution rate is the change in gas during diffusion. This allows for the determination of real-time gas changes, and the ventilation fan can be controlled based on this dilution rate. Compared with existing solutions, adjusting the air volume based on real-time changes allows the air volume to be adjusted up or down in advance when the gas level is high or low. This avoids the lag in air volume control and ensures higher accuracy, thereby improving the efficiency of air volume control.

[0152] 2) The control method of the fan control system of this application can determine the gas content in a certain space by obtaining the gas concentration from the gas sensor, and then determine the gas dilution rate. The dilution rate is the change of gas during diffusion. This can determine the real-time change of gas, and then control the ventilation fan to deliver air based on this dilution rate. Compared with the existing solution, adjusting the air volume according to the real-time change can adjust the air volume up or down in advance when the gas is high or low. This can avoid the lag of air volume control, ensure the high accuracy of this solution, and thus improve the efficiency of air volume control.

[0153] 3) The control device of the fan control system of this application can determine the gas content in a certain space by obtaining the gas concentration from the gas sensor, and then determine the gas dilution rate. The dilution rate is the change of gas during diffusion. This allows the real-time change of gas to be determined, and the ventilation fan can be controlled according to this dilution rate. Compared with the existing solution, adjusting the air volume according to the real-time change can increase or decrease the air volume in advance when the gas is high or low. This can avoid the lag of air volume control and ensure the high accuracy of this solution, thereby improving the efficiency of air volume control.

[0154] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A control method for a fan control system, characterized in that, A ventilation control system includes: a first gas sensor located at a first position on the tunnel face, used to detect a first gas concentration at the first position; a second gas sensor located at a preset distance from the first gas sensor in the tunnel, used to detect a second gas concentration at the second position; a local ventilation fan located in the intake airway of the tunnel, used to supply air to the tunnel face; and a controller communicatively connected to the first gas sensor, the second gas sensor, and the local ventilation fan, used to determine a gas dilution rate based on the first gas concentration and the second gas concentration, and to control the air volume output by the local ventilation fan based on the gas dilution rate, wherein the gas dilution rate is the rate of change of gas diffusion, and the gas dilution rate is proportional to the air volume output by the local ventilation fan; the method includes: Obtain a first gas content and a second gas content, wherein the gas content is the proportion of gas volume contained in a unit volume, the first gas content is calculated based on the first gas concentration, and the second gas content is calculated based on the second gas concentration; When the first gas concentration is greater than a first threshold and the first gas concentration is less than or equal to a second threshold, the gas dilution rate is determined based on the first gas content and the second gas content, wherein the first threshold is less than the second threshold; The air volume output by the local ventilator is adjusted based at least on the difference between the gas dilution rate and the target gas dilution rate, wherein the difference in dilution rate is proportional to the air volume output by the local ventilator. Obtaining the first gas content and the second gas content includes: calculating the first gas content according to a first formula, wherein the first formula is: , This indicates the first gas content. This represents the correction factor. Indicates the cross-sectional area of ​​the tunnel. This indicates the distance between the first gas sensor and the second gas sensor. The first gas concentration is represented; the second gas content is calculated according to the second formula, wherein the second formula is: , This indicates the second gas content. This indicates the second gas concentration; The fan control system also includes a duct, an air volume sensor, and a frequency converter. The air inlet of the duct is connected to the local ventilator, and the air outlet of the duct is located at the tunneling face of the roadway. The duct guides airflow along its direction to the tunneling face. The air volume sensor is located in the duct and is communicatively connected to the controller. The air volume sensor detects the air volume output by the local ventilator. The frequency converter is communicatively connected to both the local ventilator and the controller. The frequency converter adjusts the outlet speed of the local ventilator, at least according to the dilution ratio of the gas dilution rate and the target gas dilution rate. Adjusting the air volume output by the local ventilator based on the dilution rate difference includes: determining the required air volume based on the dilution rate difference, wherein the dilution rate difference is proportional to the required air volume; determining the air volume deviation and the air volume deviation change rate based on the required air volume and the actual air volume, wherein the actual air volume is the air volume output by the local ventilator monitored by the air volume sensor; inputting the required air volume, the actual air volume, the air volume deviation, and the air volume deviation change rate to a fuzzy controller to obtain the output signal of the fuzzy controller; outputting the output signal of the fuzzy controller to the frequency converter to control the frequency converter to adjust the air outlet speed of the local ventilator based on the output signal; Determining the airflow deviation and the rate of change of airflow deviation based on the required airflow and the actual airflow includes: calculating the airflow deviation and the rate of change of airflow deviation according to a fourth formula, wherein the fourth formula is: , This indicates the airflow deviation. This indicates the actual air volume. This indicates the required air volume. This represents the rate of change of the air volume deviation. express The airflow deviation at any given time. This indicates the moment when the rate of change of the airflow deviation is calculated.

2. The method according to claim 1, characterized in that, Determining the gas dilution rate based on the first gas content and the second gas content includes: The gas dilution rate is calculated according to the third formula, wherein the third formula is: ， This indicates the gas dilution rate.

3. The method according to claim 1, characterized in that, After obtaining the first gas content and the second gas content, the method further includes: When the first gas concentration is less than or equal to the first threshold, the air volume output by the local ventilation fan can be controlled according to the minimum requirements based on the tunneling information, wherein the tunneling information includes the tunnel length, tunneling speed and number of personnel at the working face; If the first gas concentration is greater than the second threshold and the first gas concentration is less than or equal to the third threshold, the fan control system is controlled to stop working and the ventilation system is checked, wherein the second threshold is less than the third threshold. If the first gas concentration is greater than the third threshold, the tunneling equipment at the tunneling face of the roadway shall be immediately powered off and stop operating.

4. A control device employing any one of the control methods of claims 1 to 3, characterized in that, The device includes: The acquisition unit is used to acquire a first gas content and a second gas content, wherein the gas content is the proportion of gas volume contained in a unit volume, the first gas content is calculated based on the first gas concentration, and the second gas content is calculated based on the second gas concentration; A determining unit is configured to determine the gas dilution rate based on the first gas content and the second gas content when the first gas concentration is greater than a first threshold and the first gas concentration is less than or equal to a second threshold, wherein the first threshold is less than the second threshold; A first control unit is configured to adjust the air volume output by the local ventilator based at least on the dilution rate difference between the gas dilution rate and the target gas dilution rate, wherein the dilution rate difference is proportional to the air volume output by the local ventilator. The acquisition unit includes a first calculation module and a second calculation module. The first calculation module is used to calculate the first gas content according to a first formula, wherein the first formula is: , This indicates the first gas content. This represents the correction factor. Indicates the cross-sectional area of ​​the tunnel. This indicates the distance between the first gas sensor and the second gas sensor. The first gas concentration is represented; the second calculation module is used to calculate the second gas content according to the second formula, wherein the second formula is: , This indicates the second gas content. This indicates the second gas concentration; The fan control system further includes a duct, an air volume sensor, and a frequency converter. The air inlet of the duct is connected to the local ventilator, and the air outlet of the duct is located at the tunneling face of the roadway. The duct guides the airflow along its direction to the tunneling face. The air volume sensor is located in the duct and is communicatively connected to the controller. The air volume sensor detects the air volume output by the local ventilator. The frequency converter is communicatively connected to both the local ventilator and the controller, and is used to adjust the air outlet speed of the local ventilator. The first control unit includes a first determination module, a second determination module, and a processing module. The system comprises: a first determining module for determining the required air volume based on the dilution rate difference, wherein the dilution rate difference is proportional to the required air volume; a second determining module for determining the air volume deviation and the air volume deviation change rate based on the required air volume and the actual air volume, wherein the actual air volume is the air volume output by the local ventilator as monitored by the air volume sensor; and a processing module for inputting the required air volume, the actual air volume, the air volume deviation, and the air volume deviation change rate to a fuzzy controller to obtain the output signal of the fuzzy controller, and outputting the output signal of the fuzzy controller to the frequency converter to control the frequency converter to adjust the air outlet speed of the local ventilator based on the output signal. The second determining module includes a calculation submodule, which is used to calculate the airflow deviation and the rate of change of the airflow deviation according to the fourth formula, wherein the fourth formula is: ， This indicates the airflow deviation. This indicates the actual air volume. This indicates the required air volume. This represents the rate of change of the air volume deviation. express The airflow deviation at any given time. This indicates the moment when the rate of change of the airflow deviation is calculated.

Images