Real-time fire alarm system and method for switching between wireless and wired dual-mode communication

Abstract

This invention relates to the field of fire alarms, specifically to a real-time fire alarm system and a method for switching between wired and wireless dual-mode communication. The method first acquires temperature and smoke concentration data for each monitoring point in the current scene, identifies the wired transmission node directly connected to the target monitoring point, and the wireless transmission access point directly connected to the target monitoring point. It then analyzes the impact of the fire on the wired transmission node and the transmission line between the target monitoring point and the wired transmission node to obtain the wired transmission stability. Finally, it analyzes the impact of the fire on the wireless transmission access point of the target monitoring point to obtain the wireless transmission stability. Based on the wired and wireless transmission stability, the transmission mode for the target monitoring point is selected. This invention avoids the problem of fire information transmission failure due to transmission line damage or signal interference caused by fire, significantly improving the reliability and stability of fire information transmission.

Description

Technical Field

[0001] This invention relates to the field of fire alarms, specifically to a real-time fire alarm system and a method for switching between wireless and wired dual-mode communication. Background Technology

[0002] Fire alarm systems are becoming increasingly common in various locations such as schools, hospitals, and factories. In terms of technology, fire alarm systems are constantly developing towards intelligence and networking. The new generation of fire alarm systems adopts advanced sensor technology and intelligent management systems, which can monitor fire risks in real time and quickly issue alarm signals, improving the efficiency and accuracy of fire prevention and control. In addition, with the development of cloud computing technology, more and more fire alarm systems are beginning to transform to cloud services, providing users with more convenient and reliable services.

[0003] Current real-time fire alarm systems typically use either wired or wireless transmission modes when transmitting fire alarm information. However, when a fire occurs, the high temperatures and dense smoke generated by the surrounding environment can interfere with the signal transmission quality in both wired and wireless modes, causing signal transmission failure and reducing the reliability of fire information transmission. Summary of the Invention

[0004] To address the technical problem that the high temperatures and dense smoke generated by the surrounding environment during a fire can interfere with the signal transmission quality in both wired and wired transmission modes, leading to signal transmission failure and reduced reliability of fire information transmission, this invention aims to provide a real-time fire signal alarm system and a method for switching between wireless and wired dual-mode communication. The specific technical solution adopted is as follows:

[0005] This invention proposes a method for switching between wireless and wired dual-mode communication, the method comprising:

[0006] Acquire temperature and smoke concentration data for each monitoring point in the current scene, as well as the network nodes and access points that are connected to the monitoring points via wired and wireless connections;

[0007] Using any monitoring point as the target monitoring point, and the network node directly wired to the target monitoring point as the wired transmission node, uniform markings are made on the transmission line between the target monitoring point and the wired transmission node to obtain multiple marked points on the transmission line. From all monitoring points, multiple high-temperature points and one fire center point are selected. Based on the distances between the wired transmission node and each high-temperature point, the distance between the wired transmission node and the fire center point, the distance between each marked point on the transmission line and each high-temperature point, and the distance between each marked point and the fire center point, the wired transmission stability of the target monitoring point is obtained.

[0008] The access point that is directly wirelessly connected to the target monitoring point is used as the wireless transmission access point of the target monitoring point. Based on the differences in temperature data and smoke concentration data of each monitoring point, high-concentration smoke points are screened out from all monitoring points. The wireless transmission stability of the target monitoring point is obtained based on the distance between the wireless transmission access point and each high-temperature point, the distance between the wireless transmission access point and each high-concentration smoke point, and the received signal strength of the wireless transmission access point.

[0009] Based on the wired transmission stability and the wireless transmission stability of the target monitoring point, the transmission method of the target monitoring point is selected.

[0010] Furthermore, obtaining the wired transmission stability of the target monitoring point includes:

[0011] The minimum Euclidean distance between the wired transmission node of the target monitoring point and all the high-temperature points is taken as the closest fire distance of the wired transmission node. A negative correlation mapping is performed on the closest fire distance of the wired transmission node to obtain the direct fire impact degree of the wired transmission node.

[0012] The numerator is the difference between the Euclidean distance between the wired transmission node of the target monitoring point and the center point of the fire and the nearest distance of the wired transmission node to the fire. The denominator is the difference between the current time and the time when the fire alarm first appears. The ratio is used as the spread rate of the fire in the direction of the wired transmission node.

[0013] The product of the direct impact of the fire on the wired transmission node and the spread rate of the fire in the direction of the wired transmission node is used as the first fire impact coefficient of the wired transmission node.

[0014] The second fire impact coefficient of the transmission line between the target monitoring point and the wired transmission node is obtained based on the distance between each marker point and each high temperature point on the transmission line, as well as the distance between each marker point and the fire center point.

[0015] The average values ​​of the first fire impact coefficient and the second fire impact coefficient are subjected to negative correlation normalization to obtain the wired transmission stability of the target monitoring point.

[0016] Furthermore, the second fire impact coefficient for obtaining the transmission line between the target monitoring point and the wired transmission node includes:

[0017] Using the calculation method of the first fire impact coefficient of the wired transmission node, the fire impact parameters of each marker point are obtained based on the distance between each marker point and each high temperature point on the transmission line and the distance between each marker point and the fire center point.

[0018] The average value of the fire impact parameters of all marked points on the transmission line is used as the second fire impact coefficient of the transmission line between the target monitoring point and the wired transmission node.

[0019] Furthermore, the process of screening out high-concentration smoke points from all monitoring points includes:

[0020] The temperature data from each monitoring point are normalized to obtain the standard temperature value for each monitoring point.

[0021] The smoke concentration data at each monitoring point are normalized to obtain the standard value of smoke concentration for each monitoring point.

[0022] The difference between the standard value of smoke concentration and the standard value of temperature at each monitoring point is used as the smoke assessment value for each monitoring point;

[0023] Monitoring points with smoke assessment values ​​greater than 0 are designated as high-concentration smoke points.

[0024] Furthermore, obtaining the wireless transmission stability of the target monitoring point includes:

[0025] The Euclidean distance between the high-temperature point closest to the wireless transmission access point and the high-concentration smoke point closest to the wireless transmission access point is used as the numerator, and the minimum Euclidean distance between the wireless transmission access point and all the high-temperature points is used as the denominator. The ratio is used as the smoke diffusion degree of the wireless transmission access point.

[0026] The wireless transmission stability of the target monitoring point is obtained based on the degree of smoke diffusion and the received signal strength at the wireless transmission access point of the target monitoring point.

[0027] Furthermore, obtaining the wireless transmission stability of the target monitoring point based on the smoke diffusion level and received signal strength of the wireless transmission access point includes:

[0028] The wireless transmission stability of the target monitoring point is obtained by performing negative correlation normalization on the product of the absolute value of the RSSI value of the wireless transmission access point and the degree of smoke diffusion.

[0029] Further, selecting the transmission method for the target monitoring point based on the wired transmission stability and the wireless transmission stability of the target monitoring point includes:

[0030] When the signal transmission feedback is poor, if the wired transmission stability of the target monitoring point is greater than the wireless transmission stability, then the target monitoring point selects wired transmission.

[0031] If the wired transmission stability of the target monitoring point is less than the wireless transmission stability, then the target monitoring point selects wireless transmission.

[0032] If the wired transmission stability of the target monitoring point is equal to the wireless transmission stability, then the target monitoring point can choose either wired or wireless transmission.

[0033] Furthermore, the process of selecting multiple high-temperature points and one fire epicenter from all monitoring points includes:

[0034] Monitoring points with temperature data exceeding a preset high-temperature threshold are designated as high-temperature points, and the monitoring point corresponding to the maximum temperature data value is designated as the fire center point.

[0035] Furthermore, the preset high temperature threshold ranges from 500 to 800 degrees Celsius.

[0036] This invention also proposes a real-time fire alarm system, which includes a transmitter and a remote receiver. The transmitter includes a fire detection module, a signal processing module, and a fire alarm module. The fire alarm module further includes a communication mode selection module. The communication mode selection module acquires temperature data and smoke concentration data of each monitoring point in the current scene, as well as network nodes connected to the monitoring points by wired connections and access points connected by wireless connections, and processes the temperature data and smoke concentration data to implement any of the steps of a wireless-wired dual-mode communication switching method.

[0037] The present invention has the following beneficial effects:

[0038] In traditional solutions, wired transmission lines are easily burned during a fire, and wireless transmission signals are easily interrupted by dense smoke and electromagnetic interference. However, this solution, through an intelligent switching mechanism, can adjust the transmission mode in real time under the influence of fire, prioritizing the transmission method with high signal transmission stability. This effectively avoids the problem of fire information transmission failure due to transmission line damage or signal interference caused by fire, significantly improving the reliability and stability of fire information transmission and ensuring that fire alarms can be transmitted to the remote receiving end in a timely and accurate manner. Attached Figure Description

[0039] To more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 A flowchart of a wireless-wired dual-mode communication switching method provided in one embodiment of the present invention;

[0041] Figure 2This is an overall framework diagram of a real-time fire alarm system provided in one embodiment of the present invention;

[0042] Figure 3 This is a framework diagram of the transmitting end of a real-time fire alarm system provided in one embodiment of the present invention. Detailed Implementation

[0043] To further illustrate the technical means and effects adopted by the present invention to achieve its intended purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation, structure, features, and effects of a real-time fire alarm system and a wireless-wired dual-mode communication switching method proposed according to the present invention. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0045] The following description, in conjunction with the accompanying drawings, details the specific scheme of the real-time fire alarm system and the wireless-wired dual-mode communication switching method provided by the present invention.

[0046] Please see Figure 1 The diagram illustrates a flowchart of a wireless-wired dual-mode communication switching method according to an embodiment of the present invention, the method comprising:

[0047] Step S1: Obtain temperature data and smoke concentration data for each monitoring point in the current scene, as well as network nodes connected to the monitoring points via wired connections and access points connected via wireless connections.

[0048] To achieve real-time fire alarms in places such as schools, hospitals, and factories, temperature sensors or smoke sensors are usually installed at multiple different locations in these places to monitor the temperature and smoke concentration of the surrounding environment. Therefore, in this embodiment of the invention, temperature sensors and smoke sensors are first installed at different monitoring points in the current scenario, such as schools, hospitals, and factories. Each monitoring point has a transmitter of the real-time fire alarm system. The transmitter is used to transmit the detected fire information to the remote receiver of the real-time fire alarm system. The transmitter has both wired and wireless transmission modes.

[0049] This invention first utilizes temperature sensors and smoke sensors installed at different monitoring points to collect temperature and smoke concentration data at each monitoring point. Simultaneously, it identifies network nodes that establish wired connections with the transmitters at each monitoring point. These network nodes include network devices such as switches or routers. The transmitters at each monitoring point establish wired connections and transmit information to the network nodes via transmission media such as cables or optical fibers. Furthermore, it identifies access points that establish wireless connections with the transmitters at each monitoring point. These access points specifically refer to network devices capable of providing wireless connectivity, such as Wi-Fi devices. The transmitters at each monitoring point primarily establish wireless connections and transmit information to the access points via radio waves.

[0050] It should be noted that, in order to perform data analysis on the current scene, this embodiment of the invention can also construct a 3D model of the current scene by combining computer vision technology and BIM information of the current scene, and mark the location information of monitoring points, network nodes and access points in the 3D model. The construction of the 3D model of the current scene is a well-known technical means in the art, and will not be described in detail here.

[0051] Step S2: Take any monitoring point as the target monitoring point, and the network node directly wired to the target monitoring point as the wired transmission node. Mark the transmission line between the target monitoring point and the wired transmission node evenly to obtain multiple marked points on the transmission line. Select multiple high-temperature points and one fire center point from all monitoring points. Based on the distance between the wired transmission node and each high-temperature point, the distance between the wired transmission node and the fire center point, the distance between each marked point on the transmission line and each high-temperature point, and the distance between each marked point and the fire center point, obtain the wired transmission stability of the target monitoring point.

[0052] When a fire occurs, the wired and wireless transmission quality of each monitoring point is affected to varying degrees. Therefore, it is necessary to analyze each monitoring point individually. First, we can take any one monitoring point as the target monitoring point. During a fire, flames and high temperatures can directly burn wired transmission cables or optical fibers. For example, in a building fire, open flames can quickly spread to cable conduits, burning through the cables and causing signal transmission interruptions. Even if the cables are buried in walls, high temperatures can cause the walls to crack, exposing and damaging the cables. This results in poor information quality when the target monitoring point sends information to network nodes via cables or optical fibers. Simultaneously, high temperatures can also affect network nodes directly wired to the monitoring equipment at the target monitoring point, reducing information transmission quality. Therefore, we can take the network nodes directly wired to the target monitoring point as wired transmission nodes and uniformly mark multiple points on the transmission line between the target monitoring point and the wired transmission nodes. The transmission line between the target monitoring point and the wired transmission nodes represents the wired medium, such as cables or optical fibers.

[0053] Preferably, in one embodiment of the present invention, a mark is made every preset length on the transmission line between the target monitoring point and the wired transmission node, thereby obtaining multiple mark points on the transmission line. The preset length is set to 1 meter, and the specific value of the preset length can also be set by the implementer according to the specific implementation scenario, and is not limited here.

[0054] When a fire occurs, the closer the wired transmission node of the target monitoring point, and the transmission line between the target monitoring point and the wired transmission node, are to the high-temperature location, the greater the impact on the information transmission from the target monitoring point to the wired transmission node through the transmission line. Therefore, multiple high-temperature points and one fire center point can be selected from all monitoring points first. Subsequently, the stability of the wired transmission of the target monitoring point can be accurately analyzed based on the distance between the wired transmission node and the high-temperature point or fire center point, as well as the distance between multiple marker points on the transmission line and the high-temperature point or fire center point.

[0055] Preferably, in one embodiment of the present invention, the method for obtaining multiple high-temperature points and one fire center point specifically includes:

[0056] Monitoring points with temperature data exceeding a preset high-temperature threshold are designated as high-temperature points, and the monitoring point corresponding to the maximum temperature data is designated as the fire center point, which is the location where the fire is most severe. The preset high-temperature threshold ranges from 500 to 800 degrees Celsius. In one embodiment of the present invention, the preset high-temperature threshold is set to 600 degrees Celsius. The specific value of the preset high-temperature threshold can also be set by the implementer according to the specific implementation scenario, and is not limited here.

[0057] The closer the wired transmission node of the target monitoring point is to the high-temperature point, and the faster the high temperature generated by the fire spreads to the wired transmission node, the greater the impact of the high temperature on the wired transmission node, and the worse the stability of the wired transmission at the target monitoring point. Similarly, the closer the transmission line between the target monitoring point and the wired transmission node is to the high-temperature point, and the faster the high temperature generated by the fire spreads to the transmission line, the greater the impact of the high temperature on the transmission line, and the worse the stability of the wired transmission at the target monitoring point. Therefore, the wired transmission stability of the target monitoring point can be obtained based on the distances between the wired transmission node and each high-temperature point, the distance between the wired transmission node and the fire center, the distance between each marker point on the transmission line and each high-temperature point, and the distance between each marker point and the fire center. The wired transmission stability reflects the stability of the fire information transmission from the target monitoring point's transmitter to the wired transmission node. The higher the wired transmission stability, the more stable the wired transmission at the target monitoring point.

[0058] Preferably, in one embodiment of the present invention, the method for obtaining the wired transmission stability of the target monitoring point specifically includes:

[0059] First, the minimum Euclidean distance between the wired transmission node of the target monitoring point and all high-temperature points is taken as the closest distance to the fire at the wired transmission node. The smaller the closest distance to the fire at the wired transmission node, the closer the wired transmission node is to the high-temperature location, and the greater the degree of influence of the fire on the wired transmission node. Therefore, a negative correlation mapping can be performed on the closest distance to the fire at the wired transmission node to obtain the direct impact degree of the fire on the wired transmission node. The greater the direct impact degree of the fire, the greater the degree of influence of the fire on the wired transmission node, and the more unstable the wired transmission at the target monitoring point is.

[0060] Then, the difference between the Euclidean distance between the wired transmission node of the target monitoring point and the center of the fire and the nearest distance of the wired transmission node to the fire is used as the numerator, and the difference between the current time and the time when the fire alarm first appears is used as the denominator. The ratio is used as the spread speed of the fire in the direction of the wired transmission node. The greater the spread speed, the faster the flames and high temperature generated by the fire spread to the wired transmission node, which in turn indicates that the wired transmission node is more affected by the fire, and the more unstable the wired transmission of the target monitoring point is.

[0061] Therefore, the product of the direct impact of the fire on the wired transmission node and the spread rate of the fire in the direction of the wired transmission node is used as the first fire impact coefficient of the wired transmission node.

[0062] As an example, in one embodiment of the present invention, the expression for the first fire impact coefficient of the wired transmission node of the target monitoring point can be specifically as follows:

[0063]

[0064] in, The first fire impact coefficient represents the wired transmission node of the target monitoring point; This represents the minimum Euclidean distance between the wired transmission node of the target monitoring point and all high-temperature points, i.e., the closest distance to the fire at the wired transmission node of the target monitoring point. This indicates the degree to which a fire directly affects the wired transmission node; Represented by natural constant An exponential function with base 0 is used for negative correlation mapping. The Euclidean distance between the wired transmission node of the target monitoring point and the fire center point; Indicates the current moment; Indicates the moment when the fire alarm is first issued; This indicates the speed at which the fire spreads in the direction of the wired transmission node.

[0065] It should be noted that negative correlation mapping can also be achieved through other basic mathematical operations in other embodiments of the present invention, which will not be elaborated here.

[0066] Similarly, based on the distance between each marker point and each high-temperature point on the transmission line, as well as the distance between each marker point and the fire center point, the second fire impact coefficient of the transmission line between the target monitoring point and the wired transmission node is obtained.

[0067] Preferably, in one embodiment of the present invention, the method for obtaining the second fire impact coefficient of the transmission line between the target monitoring point and the wired transmission node specifically includes:

[0068] The calculation method for the first fire impact coefficient using wired transmission nodes is as follows: Based on the distance between each marker point and each high-temperature point on the transmission line, as well as the distance between each marker point and the fire center point, the fire impact parameters for each marker point are obtained. The specific calculation formula is as follows:

[0069]

[0070] in, This represents the first [node] on the transmission line between the target monitoring point and the wired transmission node. Fire impact parameters at each marker point; Indicates the first on the transmission line The minimum Euclidean distance between each marker point and all high-temperature points; Indicates the first on the transmission line The fire situation at each marked point directly affects the degree of fire; Represented by natural constant An exponential function with base 0 is used for negative correlation mapping. Indicates the first on the transmission line The Euclidean distance between each marker point and the fire center point; Indicates the current moment; Indicates the moment when the fire alarm is first issued; This indicates the fire situation on the transmission line. The spread rate in the direction of each marker point.

[0071] The larger the fire impact parameter of a certain marker point on the transmission line, the greater the degree to which the marker point is affected by the fire. Therefore, the average value of the fire impact parameters of all marker points on the transmission line can be used as the second fire impact coefficient of the transmission line between the target monitoring point and the wired transmission node.

[0072] As an example, in one embodiment of the present invention, the expression for the second fire impact coefficient of the transmission line between the target monitoring point and the wired transmission node can be specifically as follows:

[0073]

[0074] in, The second fire impact coefficient represents the transmission line between the target monitoring point and the wired transmission node; This represents the first [node] on the transmission line between the target monitoring point and the wired transmission node. Fire impact parameters at each marker point; This indicates the number of all marker points on the transmission line between the target monitoring point and the wired transmission node.

[0075] The smaller the impact coefficients of the first and second fire events, the less impact the fire has on the wired transmission nodes and lines of the target monitoring point. This indicates a more stable signal during wired transmission at the target monitoring point's transmitting end. Therefore, a negative correlation normalization process can be applied to the average values ​​of the first and second fire event impact coefficients to limit the settlement results to within a certain range. Within the range, the wired transmission stability of the target monitoring point is obtained.

[0076] In an embodiment of the present invention, it can be achieved through... The normalization of negative correlation can be achieved through a functional form or other methods, which are not limited here. This represents a normalization function used for normalization processing. In one embodiment of the present invention, the normalization processing can specifically be, for example, maximum and minimum value normalization processing. Furthermore, the normalization in subsequent steps can all adopt maximum and minimum value normalization processing. In other embodiments of the present invention, other normalization methods can be selected according to the specific range of values, which will not be elaborated further.

[0077] As an example, in one embodiment of the present invention, the expression for the wired transmission stability of the target monitoring point can be specifically as follows:

[0078]

[0079] in, This indicates the stability of wired transmission at the target monitoring point; The first fire impact coefficient represents the wired transmission node of the target monitoring point; The second fire impact coefficient represents the transmission line between the target monitoring point and the wired transmission node; This represents the normalization function, used for normalization processing.

[0080] This concludes the analysis of the stability of wired transmission at the target monitoring points.

[0081] Step S3: Use the access point that is directly wirelessly connected to the target monitoring point as the wireless transmission access point of the target monitoring point. Based on the differences in temperature data and smoke concentration data of each monitoring point, select high-concentration smoke points from all monitoring points. Based on the distance between the wireless transmission access point and each high-temperature point, the distance between the wireless transmission access point and each high-concentration smoke point, and the received signal strength of the wireless transmission access point, obtain the wireless transmission stability of the target monitoring point.

[0082] The dense smoke produced during a fire can severely attenuate wireless signals. Tiny particles in the smoke absorb and scatter wireless signals, significantly weakening signal strength. The degree of attenuation of microwave signals varies depending on the fuel used, and the attenuation increases with increasing smoke concentration. Excessively high smoke concentrations can lead to signal distortion and increased bit error rate, thereby reducing the quality of wireless signal transmission from the transmitter at the monitoring point to the access point. Therefore, this invention first uses the access point that is directly wirelessly connected to the transmitter at the target monitoring point as the wireless transmission access point for the target monitoring point. Then, based on the differences in temperature and smoke concentration data at each monitoring point, high-concentration smoke points are selected from all monitoring points. Subsequently, the wireless transmission stability of the target monitoring point can be accurately analyzed based on the distance between the wireless transmission access point and the high-concentration smoke point.

[0083] Preferably, in one embodiment of the present invention, the method for obtaining high-concentration smoke points specifically includes:

[0084] Since temperature data and smoke concentration data have different dimensions, it is necessary to eliminate the influence between the two dimensions. The temperature data of each monitoring point is normalized to obtain the standard temperature value of each monitoring point, and the smoke concentration data of each monitoring point is normalized to obtain the standard smoke concentration value of each monitoring point.

[0085] The larger the standard value of smoke concentration at a certain monitoring point is relative to the standard value of temperature, the greater the influence of smoke concentration at that monitoring point on temperature. In other words, the smoke concentration at that monitoring point is more serious than that at high temperatures. Therefore, the difference between the standard value of smoke concentration and the standard value of temperature at each monitoring point can be used as the smoke assessment value for each monitoring point, and monitoring points with smoke assessment values ​​greater than 0 are designated as high-concentration smoke points.

[0086] After identifying multiple high-concentration smoke points, the wireless transmission stability of the target monitoring point can be obtained based on the distance between the wireless transmission access point and each high-temperature point, the distance between the wireless transmission access point and each high-concentration smoke point, and the received signal strength of the wireless transmission access point. The wireless transmission stability reflects the stability of the target monitoring point's transmitter in transmitting fire information to the wireless transmission access point. The higher the wireless transmission stability, the more stable the target monitoring point's transmitter is when using wireless transmission. Subsequently, the wired transmission stability and wireless transmission stability of the target monitoring point can be compared to select the optimal transmission mode and improve the stability and reliability of the target monitoring point's transmitter in transmitting fire information.

[0087] Preferably, in one embodiment of the present invention, the method for obtaining the wireless transmission stability of the target monitoring point specifically includes:

[0088] The Euclidean distance between the nearest high-temperature point and the nearest high-concentration smoke point to the wireless transmission access point is used as the numerator, and the minimum Euclidean distance between the wireless transmission access point and all high-temperature points is used as the denominator. The ratio is taken as the smoke diffusion degree of the wireless transmission access point. The greater the smoke diffusion degree, the wider the diffusion range of high-concentration smoke around the wireless transmission access point, and the stronger the interference when the target monitoring point sends wireless signals to the wireless transmission access point. The minimum Euclidean distance between the wireless transmission access point and all high-temperature points is the Euclidean distance between the nearest high-temperature point and the wireless transmission access point.

[0089] Meanwhile, the weaker the signal strength received by the wireless transmission access point of the target monitoring point, the stronger the interference of smoke on the wireless transmission. Therefore, the wireless transmission stability of the target monitoring point can be obtained based on the degree of smoke diffusion and the received signal strength at the wireless transmission access point of the target monitoring point.

[0090] Preferably, in one embodiment of the present invention, the method for obtaining the wireless transmission stability of the target monitoring point further includes:

[0091] The product of the absolute value of the RSSI of the wireless transmission access point and the degree of smoke diffusion is negatively correlated and normalized to limit the settlement result to... Within the range, the wireless transmission stability of the target monitoring point is obtained. The RSSI value of the wireless transmission access point reflects the strength of the signal it receives. The RSSI value of the wireless transmission access point can be calculated using existing formulas. The RSSI value is usually negative, and the closer the RSSI value is to 0, the stronger the signal received by the wireless transmission access point. Therefore, the larger the absolute value of the RSSI value of the wireless transmission access point, the greater the degree of smoke diffusion at the wireless transmission access point, the stronger the interference of smoke on the wireless transmission access point, the weaker the signal it receives, and thus the worse the stability of the wireless transmission of the target monitoring point.

[0092] In other embodiments of the present invention, the signal-to-noise ratio (SNR) of a wireless transmission access point can be used to reflect the strength of the wireless signal it receives. The higher the SNR, the stronger the wireless signal received by the wireless transmission access point. In this case, the product of the negatively correlated SNR of the wireless transmission access point and the degree of smoke diffusion can be negatively correlated and normalized to obtain the wireless transmission stability of the target monitoring point.

[0093] As an example, in one embodiment of the present invention, the expression for the wireless transmission stability of the target monitoring point can be specifically as follows:

[0094]

[0095] in, This indicates the stability of wireless transmission at the target monitoring point; This represents the Euclidean distance between the nearest high-temperature point and the nearest high-concentration smoke point to the wireless access point. This represents the minimum Euclidean distance between the wireless access point and all high-temperature points; This indicates the degree of smoke diffusion at the wireless transmission access point; This indicates the RSSI value of the wireless access point; This represents the normalization function, used for normalization processing.

[0096] This concludes the analysis of the stability of wireless transmission at the target monitoring point.

[0097] Step S4: Select the transmission method for the target monitoring point based on the stability of wired and wireless transmission.

[0098] Based on the above analysis of the stability of wired and wireless transmission at the target monitoring points, in the event of a fire, the transmission method of the target monitoring point can be selected according to the stability of wired and wireless transmission. This ensures that the transmitter of the real-time fire alarm system can prioritize the more stable transmission method when a fire occurs, effectively avoiding the problem of fire information transmission failure due to transmission line damage or signal interference caused by a fire, and significantly improving the reliability and stability of fire information transmission.

[0099] Preferably, in one embodiment of the present invention, when no fire occurs, the transmitter of the target monitoring point can transmit fire information using wireless or wired transmission. When a fire occurs and the signal transmission feedback received by the transmitter of the target monitoring point is poor, if the stability of wired transmission of the target monitoring point is greater than that of wireless transmission, then the transmitter of the target monitoring point selects wired transmission.

[0100] If the stability of wired transmission at the target monitoring point is lower than that of wireless transmission, then the transmitter at the target monitoring point will select wireless transmission.

[0101] If the wired transmission stability of the target monitoring point is equal to that of the wireless transmission stability, then the transmitter of the target monitoring point can choose either wired or wireless transmission.

[0102] Using the same method described above, the transmission mode of each monitoring point can be switched when a fire occurs, so as to ensure the stable transmission of fire information.

[0103] One embodiment of the present invention provides a real-time fire alarm system; please refer to [link / reference]. Figure 2 and Figure 3 This document illustrates an overall framework diagram of a real-time fire alarm system according to an embodiment of the present invention, as well as a framework diagram of the transmitting end of the real-time fire alarm system. The system includes a transmitting end and a remote receiving end. The transmitting end includes a fire detection module, a signal processing module, and a fire alarm module. The fire alarm module further includes a communication mode selection module. The communication mode selection module acquires temperature data and smoke concentration data of each monitoring point in the current scene, as well as network nodes connected to the monitoring points via wired connections and access points connected via wireless connections, and processes the temperature data and smoke concentration data to implement the methods described in steps S1 to S4.

[0104] The fire detection module is used to detect signs of a fire, such as smoke, temperature and flame. Common detectors include smoke detectors, heat detectors and optical quantum sensors, and the collected data is sent to the signal processing module.

[0105] The signal processing module receives various data transmitted by the fire detection module, analyzes and processes the data to determine the fire situation and whether an alarm is needed, and sends the processing results to the fire alarm module.

[0106] After receiving data and instructions from the fire detection module, the fire alarm module records information such as the location and time of the fire. Then, the communication mode selection module selects the transmission mode and transmits the alarm information to the remote receiving end via wired or wireless means.

[0107] It should be noted that the order of the above embodiments of the present invention is merely for descriptive purposes and does not represent the superiority or inferiority of the embodiments. The processes depicted in the accompanying drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0108] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

Claims

1. A wireless-wired dual-mode communication switching method for use in a real-time fire alarm system, characterized in that, The method includes: Acquire temperature and smoke concentration data for each monitoring point in the current scene, as well as the network nodes and access points that are connected to the monitoring points via wired and wireless connections; Using any monitoring point as the target monitoring point, and the network node directly wired to the target monitoring point as the wired transmission node, uniform markings are made on the transmission line between the target monitoring point and the wired transmission node to obtain multiple marked points on the transmission line. From all monitoring points, multiple high-temperature points and one fire center point are selected. Based on the distances between the wired transmission node and each high-temperature point, the distance between the wired transmission node and the fire center point, the distance between each marked point on the transmission line and each high-temperature point, and the distance between each marked point and the fire center point, the wired transmission stability of the target monitoring point is obtained. The access point that is directly wirelessly connected to the target monitoring point is used as the wireless transmission access point of the target monitoring point. Based on the differences in temperature data and smoke concentration data of each monitoring point, high-concentration smoke points are screened out from all monitoring points. The wireless transmission stability of the target monitoring point is obtained based on the distance between the wireless transmission access point and each high-temperature point, the distance between the wireless transmission access point and each high-concentration smoke point, and the received signal strength of the wireless transmission access point. Based on the wired transmission stability and the wireless transmission stability of the target monitoring point, the transmission method of the target monitoring point is selected.

2. The wireless-wired dual-mode communication switching method according to claim 1, characterized in that, The obtained wired transmission stability of the target monitoring point includes: The minimum Euclidean distance between the wired transmission node of the target monitoring point and all the high-temperature points is taken as the closest fire distance of the wired transmission node. A negative correlation mapping is performed on the closest fire distance of the wired transmission node to obtain the direct fire impact degree of the wired transmission node. The numerator is the difference between the Euclidean distance between the wired transmission node of the target monitoring point and the center point of the fire and the nearest distance of the wired transmission node to the fire. The denominator is the difference between the current time and the time when the fire alarm first appears. The ratio is used as the spread rate of the fire in the direction of the wired transmission node. The product of the direct impact of the fire on the wired transmission node and the spread rate of the fire in the direction of the wired transmission node is used as the first fire impact coefficient of the wired transmission node. The second fire impact coefficient of the transmission line between the target monitoring point and the wired transmission node is obtained based on the distance between each marker point and each high temperature point on the transmission line, as well as the distance between each marker point and the fire center point. The average values ​​of the first fire impact coefficient and the second fire impact coefficient are subjected to negative correlation normalization to obtain the wired transmission stability of the target monitoring point.

3. The wireless-wired dual-mode communication switching method according to claim 2, characterized in that, The second fire impact coefficient obtained from the transmission line between the target monitoring point and the wired transmission node includes: Using the calculation method of the first fire impact coefficient of the wired transmission node, the fire impact parameters of each marker point are obtained based on the distance between each marker point and each high temperature point on the transmission line and the distance between each marker point and the fire center point. The average value of the fire impact parameters of all marked points on the transmission line is used as the second fire impact coefficient of the transmission line between the target monitoring point and the wired transmission node.

4. The wireless-wired dual-mode communication switching method according to claim 1, characterized in that, The selection of high-concentration smoke points from all monitoring points includes: The temperature data from each monitoring point are normalized to obtain the standard temperature value for each monitoring point. The smoke concentration data at each monitoring point are normalized to obtain the standard value of smoke concentration for each monitoring point. The difference between the standard value of smoke concentration and the standard value of temperature at each monitoring point is used as the smoke assessment value for each monitoring point; Monitoring points with smoke assessment values ​​greater than 0 are designated as high-concentration smoke points.

5. The wireless-wired dual-mode communication switching method according to claim 1, characterized in that, The obtained wireless transmission stability of the target monitoring point includes: The Euclidean distance between the high-temperature point closest to the wireless transmission access point and the high-concentration smoke point closest to the wireless transmission access point is used as the numerator, and the minimum Euclidean distance between the wireless transmission access point and all the high-temperature points is used as the denominator. The ratio is used as the smoke diffusion degree of the wireless transmission access point. The wireless transmission stability of the target monitoring point is obtained based on the degree of smoke diffusion and the received signal strength at the wireless transmission access point of the target monitoring point.

6. The wireless-wired dual-mode communication switching method according to claim 5, characterized in that, The process of obtaining the wireless transmission stability of the target monitoring point based on the smoke diffusion level and received signal strength of the wireless transmission access point includes: The wireless transmission stability of the target monitoring point is obtained by performing negative correlation normalization on the product of the absolute value of the RSSI value of the wireless transmission access point and the degree of smoke diffusion.

7. The wireless-wired dual-mode communication switching method according to claim 1, characterized in that, The step of selecting the transmission method for the target monitoring point based on the wired transmission stability and the wireless transmission stability of the target monitoring point includes: When the signal transmission feedback is poor, if the wired transmission stability of the target monitoring point is greater than the wireless transmission stability, then the target monitoring point selects wired transmission. If the wired transmission stability of the target monitoring point is less than the wireless transmission stability, then the target monitoring point selects wireless transmission. If the wired transmission stability of the target monitoring point is equal to the wireless transmission stability, then the target monitoring point can choose either wired or wireless transmission.

8. The wireless-wired dual-mode communication switching method according to claim 1, characterized in that, The process of selecting multiple high-temperature points and one fire epicenter from all monitoring points includes: Monitoring points with temperature data exceeding a preset high-temperature threshold are designated as high-temperature points, and the monitoring point corresponding to the maximum temperature data value is designated as the fire center point.

9. A wireless-wired dual-mode communication switching method according to claim 8, characterized in that, The preset high temperature threshold ranges from 500 to 800 degrees Celsius.

10. A real-time fire alarm system, the system comprising a transmitter and a remote receiver, the transmitter comprising a fire detection module, a signal processing module, and a fire alarm module, characterized in that, The fire alarm module further includes a communication mode selection module. The communication mode selection module acquires the temperature data and smoke concentration data of each monitoring point in the current scene, as well as the network nodes connected to the monitoring points by wire and the access points connected by wireless, and processes the temperature data and smoke concentration data to implement the steps of the method as described in any one of claims 1 to 9.

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