Tunnel jet fan control method and system based on traffic flow and pollutant concentration

Abstract

The invention relates to the technical field of tunnel equipment, and discloses a tunnel jet fan control method and system based on traffic flow and pollutant concentration, and the system comprises a data collection module, a data processing module, a control decision module, a jet fan control module and a jet fan frequency conversion controller which are in communication connection in sequence; the data acquisition module is used for acquiring traffic flow and pollutant concentration data; the data processing module is used for processing the traffic flow and pollutant concentration data to obtain processed data; the control decision module is used for generating a control instruction of the jet fan according to the processed data; the jet fan control module is used for converting the control instruction into a corresponding frequency control signal; and the jet fan frequency conversion controller is used for changing the power supply frequency of the jet fan motor according to the received frequency control signal so as to change the jet flow of the jet fan. According to the invention, the air quality in the tunnel can reach the standard, and the energy consumption can be effectively reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of tunnel equipment and relates to a control method and system for tunnel jet fans based on traffic flow and pollutant concentration. Background Art

[0002] In the modern transportation system, tunnels, as important traffic infrastructure, the safety and comfort of their internal environment are crucial. At present, most tunnel ventilation systems operate jet fans in a fixed mode, that is, the fans continuously work at a preset constant frequency or power. This method has obvious defects. During periods with low traffic flow and low pollutant concentration, the continuous high-power operation of the fans will cause a large amount of energy waste; while when the traffic flow surges and the pollutant concentration rises rapidly, the fixed ventilation volume cannot discharge pollutants in time, resulting in the deterioration of the air quality in the tunnel, threatening the health of drivers and passengers and affecting driving safety. With the increasing traffic flow and the continuous improvement of the requirements for the tunnel environment, the existing ventilation control methods are difficult to meet the actual needs, and there is an urgent need to develop a more intelligent and efficient tunnel ventilation control scheme. Summary of the Invention

[0003] The purpose of the present invention is to provide a control method and system for tunnel jet fans based on traffic flow and pollutant concentration, which can minimize energy loss and improve the overall performance of the tunnel ventilation system while ensuring that the air quality in the tunnel meets safety standards.

[0004] To solve the above technical problems, the present invention is implemented by the following technical solutions.

[0005] In a first aspect, a control system for tunnel jet fans based on traffic flow and pollutant concentration includes: a data acquisition module, a data processing module, a control decision module, a jet fan control module, and a jet fan variable frequency controller that are communicatively connected in sequence; the data acquisition module is used to collect traffic flow and pollutant concentration data and transmit the traffic flow and pollutant concentration data to the data processing module; the data processing module is used to process the traffic flow and pollutant concentration data to obtain processed data and transmit the processed data to the control decision module; the control decision module is used to generate a control instruction for the jet fan according to the processed data and transmit the control instruction to the jet fan control module; the jet fan control module is used to convert the control instruction into a corresponding frequency control signal and transmit the frequency control information to the jet fan variable frequency controller; the jet fan variable frequency controller is used to change the power frequency of the jet fan motor according to the received frequency control signal, thereby changing the jet flow rate of the jet fan.

[0006] In combination with the first aspect, further, the data acquisition module includes a geomagnetic sensor, an electrochemical sensor, and an infrared sensor; the geomagnetic sensor is used to collect traffic flow; the electrochemical sensor is used to collect carbon monoxide concentration; the infrared sensor is used to collect nitrogen oxide concentration; the geomagnetic sensor, the electrochemical sensor, and the infrared sensor are respectively communicatively connected to the data processing module, and are respectively used to transmit the collected data to the data processing module.

[0007] In combination with the first aspect, further, the geomagnetic sensor is installed at a depth of 5 - 10 cm below the tunnel road surface; the electrochemical sensor and the infrared sensor are arranged on both side walls of the tunnel at a height of 1.5 - 2.5 meters from the road surface.

[0008] In combination with the first aspect, further, the data processing module includes a data pre - processor and a data calculation area. The data pre - processor is used to perform median filtering on the received traffic flow and pollutant concentration data to obtain filtered data, and transmit the filtered data to the data calculation area; the data calculation area is used to calculate the average traffic flow and the average pollutant concentration at a preset time interval based on the received filtered data, and transmit the calculated average traffic flow and average pollutant concentration to the control decision module.

[0009] In combination with the first aspect, further, the data communication and transmission in the present invention is through wired transmission. Preferably, optical fiber is used as the medium. The optical fiber has the characteristics of high bandwidth, low loss, and strong anti - interference ability. Lay the optical fiber line along the wall in the tunnel to connect each data acquisition point with the data pre - processor. The data is transmitted at high speed in the optical fiber in the form of optical signals to ensure the stability and accuracy of data transmission. For tunnel scenarios where wiring construction is difficult, wireless transmission can also be used. With the help of 5G communication technology, install communication base stations at appropriate positions in the tunnel. Each sensor sends the collected data to the base station through wireless signals, and then the base station transmits the data to the data pre - processor through the network.

[0010] In combination with the first aspect, further, the jet fan control module is connected to the jet fan variable - frequency controller through a control line. After receiving the control instruction of the desired jet fan jet flow rate output by the control decision module, the jet fan control module converts the flow rate instruction into a corresponding frequency control signal and sends it to the jet fan variable - frequency controller. The jet fan variable - frequency controller changes the power frequency input to the jet fan motor. According to the relationship that the motor speed is proportional to the power frequency, it adjusts the rotation speed of the jet fan, and thus changes the jet flow rate of the jet fan.

[0011] The control system of the present invention takes a tunnel as the application scenario, and focuses on the monitoring of traffic flow, pollutant concentration and the control of jet fans. The data acquisition module is distributed at specific positions in the tunnel to capture traffic flow and pollutant concentration data in real time. The collected data is accurately transmitted and processed by the data processing module into effective information for decision-making. The control decision-making module generates control instructions for the jet fans based on a mathematical model and the data processed by the data processing module. The jet fan control module converts the control instructions sent by the control decision-making module into corresponding frequency control signals. The variable frequency controller of the jet fan drives the jet fan to adjust the operating parameters and change the jet flow rate of the jet fan by changing the power frequency of the jet fan motor according to the received frequency control signal. All parts of the entire system cooperate closely to achieve intelligent regulation of tunnel ventilation, forming a complete closed loop from data acquisition, analysis and processing to instruction execution, ensuring that the tunnel ventilation is always in the optimal state.

[0012] In a second aspect, the present invention proposes a method for controlling a tunnel jet fan based on traffic flow and pollutant concentration, including:

[0013] Real-time collection of traffic flow and pollutant concentration data in the tunnel;

[0014] Preprocess the collected traffic flow and pollutant concentration data to obtain the average traffic flow and the average pollutant concentration within a preset time interval;

[0015] Input the obtained average traffic flow and average pollutant concentration within a preset time interval into a preset data model for calculation, and output the expected jet flow rate of the jet fan;

[0016] Adjust the power frequency of the jet fan according to the output expected jet flow rate of the jet fan.

[0017] In combination with the second aspect, further, the step of inputting the obtained average traffic flow and average pollutant concentration within a preset time interval into a preset data model for calculation and outputting the expected jet flow rate of the jet fan includes:

[0018] Calculate the tunnel CO emission based on the average traffic flow, obtain the required air volume for diluting CO according to the tunnel CO emission, and obtain the required wind speed of the jet fan for diluting carbon monoxide according to the required air volume for diluting CO;

[0019] Obtain the required air volume for diluting nitrogen oxides according to the average pollutant concentration, and obtain the required wind speed of the jet fan for diluting nitrogen oxides according to the required air volume for diluting nitrogen oxides;

[0020] Take the larger value of the required wind speed of the jet fan for diluting carbon monoxide and the required wind speed of the jet fan for diluting nitrogen oxides as the final wind speed of the jet fan;

[0021] Obtain the desired jet fan jet flow rate based on the final wind speed of the jet fan.

[0022] Combined with the second aspect, further, the tunnel CO emission Calculation formula:

[0023] ;

[0024] Among them, q co Is the CO benchmark emission, that is, one of the preset tunnel air quality standards, and is a known quantity; f a Is the vehicle condition coefficient considering CO, and is a known quantity; f d Is the vehicle density coefficient, and is a known quantity; f h Is the altitude coefficient considering CO, and is a known quantity; f m Is the vehicle type coefficient considering CO, and is a known quantity; f iv Is the longitudinal slope - vehicle speed coefficient considering CO, and is a known quantity; n is the number of vehicle type categories; N m Is the average traffic flow of the corresponding vehicle type, collected by the geomagnetic sensor; Is the tunnel length.

[0025] The required air volume Q req (CO) formula:

[0026] ;

[0027] Among them, δ is the CO design concentration, and is a known quantity; Is the standard atmospheric pressure; Is the atmospheric pressure at the tunnel site, and is a known quantity; T 0 Is the standard temperature, taking 273K; T is the summer temperature at the tunnel site, and is a known quantity.

[0028] The required wind speed v 1 For the jet fan to dilute carbon monoxide formula:

[0029] ;

[0030] Among them, v 1 Is the wind speed of the jet fan; s is the number of jet fans; A is the outlet area of the jet fan.

[0031] The formula for the required air volume V of the jet fan to dilute nitrogen oxides:

[0032] ;

[0033] Among them, n veh Is the number of vehicles in the tunnel; Q is the emission of nitrogen oxides NO x For each vehicle type, and is a known quantity; C admis the allowable concentration of pollutants and is also one of the pre-set tunnel air quality standards. It is a known quantity in terms of NO 2 calculated, and NO 2 accounts for 10% of NO x ; C amb is the average value of pollutant concentration.

[0034] The formula for the required wind speed v 2 of the jet fan to dilute nitrogen oxides is:

[0035] ;

[0036] Take the larger value of v 1 and v 2 as the final speed of the jet fan.

[0037] The present invention comprehensively considers factors such as the length, slope, and vehicle type of the tunnel to construct a mathematical model. For tunnels with a longer length, the pollutant accumulation effect is more obvious and a larger ventilation volume is required; the slope affects the vehicle driving conditions, and the vehicle exhaust emissions increase when going uphill, so the pollutant generation coefficient is correspondingly increased in the mathematical model; different vehicle types (small cars, medium-sized cars, large cars) have different exhaust emission characteristics. For example, large diesel vehicles have high carbon monoxide and particulate emissions, and different emission weights are assigned to different vehicle types in the mathematical model. The present invention determines the quantitative relationship between the traffic flow, pollutant concentration, and the jet flow rate of the jet fan by collecting a large amount of actual operation data in multiple different types of tunnels and combining theoretical analyses such as fluid mechanics and chemical kinetics.

[0038] The control decision-making module of the present invention receives the average traffic flow and the average pollutant concentration transmitted by the data transmission and processing module in real time, and at the same time reads the pre-set tunnel air quality standards. These data are input into the constructed mathematical model, and the mathematical model outputs the required jet flow rate of the jet fan under the current working conditions through internal operations. When the traffic flow increases or the pollutant concentration exceeds the set threshold, the model calculates the increased jet flow rate value; conversely, when the traffic flow decreases and the pollutant concentration drops to the safe range, the model calculates the decreased jet flow rate value, providing precise control instructions for the jet fan control module.

[0039] In a third aspect, the present invention proposes a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the above-mentioned tunnel jet fan control method based on traffic flow and pollutant concentration are implemented.

[0040] In a fourth aspect, the present invention proposes a computer device, including:

[0041] a memory for storing a computer program;

[0042] A processor for executing the computer program to implement the steps of the above-described tunnel jet fan control method based on traffic flow and pollutant concentration.

[0043] In a fifth aspect, the present invention provides a computer program product, including a computer program, characterized in that: when the computer program is executed by a processor, it implements the steps of the above-described tunnel jet fan control method based on traffic flow and pollutant concentration.

[0044] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0045] (1) The present invention provides a method and system for flexibly and intelligently controlling the jet flow rate of a jet fan in a tunnel based on traffic flow and pollutant concentration, which can minimize energy consumption to the greatest extent while ensuring that the air quality in the tunnel meets safety standards, and improve the overall performance of the tunnel ventilation system.

[0046] (2) By continuously monitoring traffic flow and pollutant concentration in real time and intelligently adjusting the jet flow rate of the jet fan, the present invention avoids high-power operation of the fan when it is unnecessary, effectively reduces energy consumption, and improves the operating efficiency of the ventilation system.

[0047] (3) The present invention can timely adjust the ventilation volume according to the change of pollutant concentration in the tunnel, ensure that the air quality in the tunnel always meets safety standards, provide a good driving environment for drivers and passengers, and ensure driving safety.

[0048] (4) The mathematical model established by the present invention takes into account various tunnel-related factors, can be applied to tunnels of different types and working conditions, and has strong generality and adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 is a schematic diagram of the control system of the present invention;

[0050] Figure 2 is a schematic diagram showing the value of the altitude coefficient f h considering CO in Embodiment 2.

[0051] The meanings of the reference numerals in the drawings are as follows:

[0052] 1 - geomagnetic sensor; 2 - electrochemical sensor; 3 - infrared sensor; 4 - data processing module; 5 - data pre-processor; 6 - data calculation area; 7 - control decision module; 8 - jet fan control module; 9 - jet fan frequency converter controller; 10 - jet fan. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0053] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical solution of the present invention, rather than limitations on the technical solution of the present invention. Without conflict, the technical features in the embodiments of the present invention and the embodiments can be combined with each other.

[0054] The term "and / or" is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0055] Embodiment 1

[0056] As Figure 1 shown, this embodiment introduces a tunnel jet fan control system based on traffic flow and pollutant concentration, including a data acquisition module, a data processing module 4, a control decision-making module 7, a jet fan control module 8, and a jet fan frequency converter 9 that are communicatively connected in sequence; the data acquisition module is used to collect traffic flow and pollutant concentration data, and transmit the traffic flow and pollutant concentration data to the data processing module 4; the data processing module 4 is used to process the traffic flow and pollutant concentration data to obtain processed data, and transmit the processed data to the control decision-making module 7; the control decision-making module 7 is used to generate a control instruction for the jet fan according to the processed data, and transmit the control instruction to the jet fan control module 8; the jet fan control module 8 is used to convert the control instruction into a corresponding frequency control signal, and transmit the frequency control information to the jet fan frequency converter 9; the jet fan frequency converter 9 is used to change the power frequency of the jet fan motor according to the received frequency control signal, and further change the jet flow rate of the jet fan.

[0057] In a specific implementation manner of this embodiment, the data acquisition module includes a geomagnetic sensor 1, an electrochemical sensor 2, and an infrared sensor 3; the geomagnetic sensor 1 is used to collect traffic flow; the electrochemical sensor 2 is used to collect carbon monoxide concentration; the infrared sensor 3 is used to collect nitrogen oxide concentration; the geomagnetic sensor 1, the electrochemical sensor 2, and the infrared sensor 3 are respectively communicatively connected to the data processing module 4, and are respectively used to transmit the collected data to the data processing module 4.

[0058] In a specific implementation manner of this embodiment, the geomagnetic sensor 1 is installed at a depth of 5 - 10 cm below the tunnel road surface. This depth can not only ensure that the geomagnetic sensor 1 can stably sense the geomagnetic changes caused by the passing of vehicles, but also will not damage the road surface structure, and can stably and accurately detect the passing of vehicles. Its working principle is based on the law of electromagnetic induction. When the metal parts of the vehicle approach, the surrounding geomagnetic field distribution will be changed, and the geomagnetic sensor 1 captures this change and converts it into an electrical signal for output; the electrochemical sensor 2 and the infrared sensor 3 are arranged on both side walls of the tunnel at a height of 1.5 - 2.5 meters from the road surface to ensure that the detected data can represent the pollutant concentration in the vehicle driving area in the tunnel. The electrochemical sensor 2 and the infrared sensor 3 are preferably arranged at a height of 2m from the road surface, and this height can better reflect the pollutant concentration in the vehicle driving area. The electrochemical sensor 2 detects pollutants with electrochemical activity such as carbon monoxide. Taking carbon monoxide detection as an example, the electrochemical sensor 2 is internally provided with a working electrode, a counter electrode and a reference electrode. When the gas containing carbon monoxide diffuses to the surface of the working electrode through the permeable membrane, an electrochemical reaction occurs to generate a current, and the magnitude of the current is proportional to the carbon monoxide concentration. The carbon monoxide concentration can be calculated by measuring the current. The infrared sensor 3 is used to detect pollutants with absorption characteristics in a specific infrared band such as nitrogen oxides. It emits infrared light with a specific wavelength. When nitrogen oxide gas exists, it will absorb part of the infrared light, resulting in a decrease in the light intensity received by the receiving end. By analyzing the change in light intensity and calculating according to the Lambert-Beer law, the nitrogen oxide concentration can be obtained.

[0059] In a specific implementation manner of this embodiment, the data processing module 4 includes a data pre-processor 5 and a data calculation area 6. The data pre-processor 5 is used to perform median filtering on the received traffic flow and pollutant concentration data to obtain the filtered data, and transmit the filtered data to the data calculation area 6; the data calculation area 6 is used to calculate the average traffic flow and the average pollutant concentration at a preset time interval for the received filtered data, and transmit the calculated average traffic flow and average pollutant concentration to the control decision module 7.

[0060] The data pre-processor 5 uses a high-performance industrial computer and runs existing data processing software. The data processing software first performs median filtering on the original data (the traffic flow and pollutant concentration data from the data acquisition module 4). For the sudden interference outliers that may appear in the original data, within a sliding data window (such as 10 consecutive data points), the original data is sorted by size, and the median value is taken as the output of the filtered data, effectively removing the abnormal data caused by electromagnetic interference, equipment instantaneous failures, etc. Then, a calibration operation is performed to eliminate the system errors of each sensor itself. Finally, the average traffic flow and the average pollutant concentration are calculated at a set time interval (such as 5 minutes) to provide a stable and accurate data basis for subsequent control decisions.

[0061] In a specific implementation manner of this embodiment, data communication and transmission in this embodiment is carried out through wired transmission. Preferably, optical fiber is used as the medium. Optical fiber has the characteristics of high bandwidth, low loss, and strong anti-interference ability. Optical fiber lines are laid along the tunnel wall, and each data acquisition point is connected to the data pre-processor. Data is transmitted at high speed in the optical fiber in the form of optical signals to ensure the stability and accuracy of data transmission. For tunnel scenarios where wiring construction is difficult, wireless transmission can also be used. With the help of 5G communication technology, communication base stations are installed at appropriate positions in the tunnel, and each sensor sends the collected data to the base station through wireless signals, and then the base station transmits the data to the data pre-processor 5 through the network.

[0062] In a specific implementation manner of this embodiment, the jet fan control module 8 is connected to the jet fan frequency converter 9 through a control line. After receiving the control instruction of the expected jet flow rate of the jet fan output by the control decision module 7, the jet fan control module 8 converts the flow rate instruction into a corresponding frequency control signal and sends it to the jet fan frequency converter 9. The jet fan frequency converter 9 changes the power frequency of the motor of the input jet fan 10. According to the relationship that the motor speed is proportional to the power frequency, the rotation speed of the jet fan is adjusted, and then the jet flow rate of the jet fan 10 is changed to ensure that the air quality in the tunnel meets the standard and the ventilation energy consumption is optimal. For example, when it is necessary to increase the jet flow rate, the power frequency is increased, the rotation speed of the jet fan 10 speeds up, and the jet flow rate increases; conversely, when the power frequency is decreased, the rotation speed of the jet fan 10 slows down, and the jet flow rate decreases.

[0063] Embodiment 2

[0064] This embodiment introduces a tunnel jet fan control method based on traffic flow and pollutant concentration, including:

[0065] Step S1, collect traffic flow and pollutant concentration data in the tunnel in real time;

[0066] Step S2, preprocess the collected traffic flow and pollutant concentration data to obtain the average traffic flow and the average pollutant concentration within a preset time interval;

[0067] Step S3, input the obtained average traffic flow and average pollutant concentration within a preset time interval into a preset data model for calculation, and output the expected jet flow rate of the jet fan;

[0068] Step S3 specifically includes the following steps:

[0069] Calculate the tunnel CO emission according to the average traffic flow, obtain the required air volume for diluting CO according to the tunnel CO emission, and obtain the required wind speed of the jet fan for diluting carbon monoxide according to the required air volume for diluting CO;

[0070] The air volume required for diluting nitrogen oxides is obtained based on the average pollutant concentration, and the required wind speed for the jet fan to dilute nitrogen oxides is obtained based on the air volume required for diluting nitrogen oxides.

[0071] Take the larger value between the required wind speed for the jet fan to dilute carbon monoxide and the required wind speed for the jet fan to dilute nitrogen oxides as the final wind speed of the jet fan.

[0072] The expected jet flow rate of the jet fan is obtained based on the final wind speed of the jet fan.

[0073] Step S4: Adjust the power frequency of the jet fan according to the output expected jet flow rate of the jet fan.

[0074] In a specific implementation manner of this embodiment, the CO emission in the tunnel Calculation formula:

[0075] ;

[0076] Among them, q co Is the reference emission of CO, that is, one of the preset tunnel air quality standards, and is a known quantity; f a Is the vehicle condition coefficient considering CO, which is a known quantity and is taken according to Table 1; f d Is the vehicle density coefficient, which is a known quantity and is taken according to Table 2; f h Is the altitude coefficient considering CO, which is a known quantity and can be taken according to Figure 2 Value; f m Is the vehicle type coefficient considering CO, which is a known quantity and is taken according to Table 3; f iv Is the longitudinal slope - vehicle speed coefficient considering CO, which is a known quantity and is taken according to Table 4; n is the number of vehicle type categories; N m Is the average traffic flow of the corresponding vehicle type, which is collected by the geomagnetic sensor; Is the tunnel length.

[0077] Table 1 Vehicle condition coefficient f considering CO a

[0078]

[0079] Table 2 Vehicle density coefficient f d

[0080]

[0081] Table 3 Vehicle type coefficient f considering CO m

[0082]

[0083] Table 4 Longitudinal slope - vehicle speed coefficient f considering CO iv

[0084]

[0085] Required air volume Q for diluting CO req (CO) formula:

[0086] ;

[0087] Among them, δ is the designed CO concentration, which is a known quantity and is taken according to Table 5; is the standard atmospheric pressure; is the atmospheric pressure at the tunnel site, which is a known quantity; T 0 is the standard temperature, taken as 273K; T is the summer temperature at the tunnel site, which is a known quantity.

[0088] Table 5

[0089]

[0090] Required wind speed v for a jet fan to dilute carbon monoxide 1 formula:

[0091] ;

[0092] Among them, v 1 is the wind speed of the jet fan; s is the number of jet fans; A is the outlet area of the jet fan;

[0093] Formula for the required air volume V of a jet fan to dilute nitrogen oxides:

[0094] ;

[0095] Among them, n veh is the number of vehicles in the tunnel; Q is the emission of nitrogen oxides NO x for each vehicle type, which is a known quantity; C adm is the allowable concentration of pollutants, which is also one of the pre-set tunnel air quality standards and is a known quantity. Calculated by NO 2 NO 2 accounts for 10% of NO x ; C amb is the average value of pollutant concentration.

[0096] Required wind speed v for a jet fan to dilute nitrogen oxides 2 formula:

[0097] ;

[0098] Take the larger value of v 1 and v 2 as the final speed of the jet fan.

[0099] Example 3

[0100] Based on the same inventive concept as other embodiments, this embodiment introduces a computer-readable storage medium with a computer program stored thereon. When the computer program is executed by a processor, the steps of the above-mentioned tunnel jet fan control method based on traffic flow and pollutant concentration are implemented.

[0101] Embodiment 4

[0102] Based on the same inventive concept as other embodiments, this embodiment introduces a computer device, including: a memory for storing a computer program; a processor for executing the computer program to implement the steps of the above-mentioned tunnel jet fan control method based on traffic flow and pollutant concentration.

[0103] Embodiment 5

[0104] Based on the same inventive concept as other embodiments, this embodiment introduces a computer program product, including a computer program that implements the steps of the above-mentioned tunnel jet fan control method based on traffic flow and pollutant concentration when executed by a processor.

[0105] The present invention sets up a traffic flow detection device and a pollutant concentration detection device in the tunnel, collects relevant data in real time and transmits it to the data processing unit. The data processing unit calculates the required jet flow rate of the jet fan in real time according to the traffic flow and pollutant concentration, and then accurately controls the operating parameters of the jet fan, realizing the intelligentization of the tunnel ventilation system. It can not only ensure that the air quality in the tunnel meets the standards, but also effectively reduce energy consumption, and is applicable to various tunnel ventilation control scenarios.

[0106] Those skilled in the art should understand that the embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can take the form of a computer program product implemented 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.

[0107] The present invention is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of the present invention. It should be understood that each flow and / or block in the flowchart and / or block diagram, as well as the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate for implementation in the processFigure 1 one process or multiple processes and / or blocks Figure 1 a device for the functions specified in one block or multiple blocks.

[0108] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory produce a manufactured article including an instruction device that implements the functions specified in the process Figure 1 one process or multiple processes and / or blocks Figure 1 in one block or multiple blocks.

[0109] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to produce a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in the process Figure 1 one process or multiple processes and / or blocks Figure 1 in one block or multiple blocks.

[0110] The embodiments of the present invention have been described above in conjunction with the accompanying drawings. However, the present invention is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present invention, those of ordinary skill in the art can also make many forms, and these all fall within the protection scope of the present invention.

Claims

1. A tunnel jet fan control system based on vehicle flow and pollutant concentration, characterized in that: include: A data acquisition module, a data processing module, a control decision module, a jet fan control module and a jet fan frequency conversion controller which are communicatively connected in sequence; the data acquisition module is used to collect vehicle flow and pollutant concentration data, and transmit the vehicle flow and pollutant concentration data to the data processing module; the data processing module is used to process the vehicle flow and pollutant concentration data to obtain processed data, and transmit the processed data to the control decision module; the control decision module is used to generate a control instruction for the jet fan according to the processed data, and transmit the control instruction to the jet fan control module; the jet fan control module is used to convert the control instruction into a corresponding frequency control signal, and transmit the frequency control information to the jet fan frequency conversion controller; the jet fan frequency conversion controller is used to change the power frequency of the jet fan motor according to the received frequency control signal, thereby changing the jet flow of the jet fan.

2. The tunnel jet fan control system based on vehicle flow and pollutant concentration according to claim 1 is characterized in that: The data acquisition module includes a geomagnetic sensor, an electrochemical sensor and an infrared sensor; the geomagnetic sensor is used to collect vehicle flow; the electrochemical sensor is used to collect carbon monoxide concentration; the infrared sensor is used to collect nitrogen oxide concentration; the geomagnetic sensor, electrochemical sensor and infrared sensor are respectively connected to the data processing module for communication, and are respectively used to transmit the collected data to the data processing module.

3. The tunnel jet fan control system based on vehicle flow and pollutant concentration according to claim 2 is characterized in that: The geomagnetic sensor is installed at a depth of 5 to 10 cm below the tunnel road surface; the electrochemical sensor and the infrared sensor are arranged on the two side walls of the tunnel at a height of 1.5 to 2.5 meters from the road surface.

4. The tunnel jet fan control system based on vehicle flow and pollutant concentration according to claim 1 is characterized in that: The data processing module includes a data preprocessor and a data calculation area. The data preprocessor is used to perform median filtering on the received vehicle flow and pollutant concentration data to obtain filtered data, and transmit the filtered data to the data calculation area; the data calculation area is used to calculate the vehicle flow average value and the pollutant concentration average value according to the received filtered data at a preset time interval, and transmit the calculated vehicle flow average value and pollutant concentration average value to the control decision module.

5. A tunnel jet fan control method based on vehicle flow and pollutant concentration, characterized in that: include: Collect real-time data on vehicle flow and pollutant concentration in tunnels; Preprocessing the collected traffic flow and pollutant concentration data to obtain the average traffic flow and pollutant concentration values ​​within a preset time interval; The average vehicle flow rate and the average pollutant concentration obtained within the preset time interval are input into a preset data model for calculation, and the expected jet flow rate of the jet fan is output; The power frequency of the jet fan is adjusted according to the desired jet flow rate of the jet fan output.

6. The tunnel jet fan control method based on vehicle flow and pollutant concentration according to claim 5 is characterized in that: The method of inputting the average vehicle flow rate and the average pollutant concentration within the preset time interval into a preset data model for calculation and outputting the expected jet flow rate of the jet fan includes: The CO emission of the tunnel is calculated based on the average vehicle flow, the required air volume for diluting CO is obtained based on the CO emission of the tunnel, and the wind speed required for the jet fan to dilute carbon monoxide is obtained based on the required air volume for diluting CO; The required air volume for diluting nitrogen oxides is obtained based on the average value of pollutant concentration, and the wind speed required for the jet fan to dilute nitrogen oxides is obtained based on the required air volume for diluting nitrogen oxides; The larger value of the wind speed required by the jet fan to dilute carbon monoxide and the wind speed required by the jet fan to dilute nitrogen oxides is taken as the final wind speed of the jet fan; The expected jet flow rate of the jet fan is obtained according to the final wind speed of the jet fan.

7. The tunnel jet fan control method based on vehicle flow and pollutant concentration according to claim 6 is characterized in that: Tunnel CO emissions The calculation formula is: ； Among them, q co is the CO baseline emission, which is a known quantity; f a is the vehicle condition coefficient considering CO, which is a known quantity; f d is the vehicle density coefficient, which is a known quantity; f h is the altitude coefficient of CO, which is a known quantity; f m is the model coefficient considering CO, which is a known quantity; f iv is the longitudinal slope-vehicle speed coefficient considering CO, which is a known quantity; n is the number of vehicle types; N m is the average traffic volume of the corresponding vehicle type, collected by the geomagnetic sensor; is the tunnel length; Air volume required to dilute CO Q req The formula of (CO): ； Among them, δ is the CO design concentration, which is a known quantity; is standard atmospheric pressure; is the atmospheric pressure at the tunnel site, which is a known quantity; T0 is the standard temperature, which is 273K; T is the summer temperature at the tunnel site, which is a known quantity; The formula for the wind speed v1 required for jet fan to dilute carbon monoxide is: ； Among them, v1 is the wind speed of the jet fan; s is the number of jet fans; A is the outlet area of ​​the jet fan; The formula for the air volume V required for jet fan to dilute nitrogen oxides is: ； Among them, n veh is the number of vehicles in the tunnel; Q is the nitrogen oxide emission of each vehicle type, which is a known quantity; C adm is the permissible concentration of pollutants, is a known quantity; C amb is the average pollutant concentration; The formula for the wind speed v2 required for the jet fan to dilute nitrogen oxides is: ； The larger of v1 and v2 is taken as the jet fan final velocity.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the tunnel jet fan control method based on vehicle flow and pollutant concentration described in any one of claims 5 to 7 are implemented.

9. A computer device, characterized in that: include: Memory for storing computer programs; A processor is used to execute the computer program to implement the steps of the tunnel jet fan control method based on vehicle flow and pollutant concentration as described in any one of claims 5 to 7.

10. A computer program product, comprising a computer program, characterized in that: When the computer program is executed by a processor, the steps of the tunnel jet fan control method based on vehicle flow and pollutant concentration described in any one of claims 5 to 7 are implemented.

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