A method and apparatus for tunnel fire location

Abstract

The present application relates to a tunnel fire positioning method and device, wherein the method obtains alarm time and alarm position of all detection devices sending fire alarm signals in the tunnel, and calculates the fire starting position in the tunnel based on the alarm time and alarm position. Thus, when positioning the fire starting position in the tunnel, the present application comprehensively calculates the position according to the alarm time and alarm position of all detection devices sending fire alarm signals, and positions the fire starting position in the tunnel through space and time, which overcomes the one-sidedness of traditional simple fire positioning based on the position of the first or last alarm device, and improves the accuracy of tunnel fire positioning.

Description

Technical Field

[0001] This invention relates to the field of tunnel fire technology, and in particular to a method and apparatus for locating tunnel fires. Background Technology

[0002] Currently, long highway tunnels mainly rely on equipment such as temperature sensors, light sensors, and smoke sensors to detect tunnel fires. Typically, the location of the first or last alarm device is used to pinpoint the location of a tunnel fire. However, in practice, due to the fact that the burning vehicle may still be in motion and the characteristics of smoke diffusion, a large number of fire alarm signals are generated, making it difficult to accurately locate the actual burning vehicle. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: to provide a method and apparatus for locating tunnel fires, thereby improving the accuracy of fire location.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: In a first aspect, the present invention provides a method for locating tunnel fires, comprising: Acquire the alarm time and location of all detection devices that issued fire alarm signals inside the tunnel; The location of the fire within the tunnel is calculated by combining the alarm time and alarm location.

[0005] The beneficial effects of this invention are as follows: when locating the fire ignition point in a tunnel, the location calculation is performed by comprehensively considering the alarm time and location of all detection devices that issued fire alarm signals. By comprehensively locating the fire ignition point in the tunnel through spatial and temporal analysis, the one-sidedness of the traditional method of simply locating the fire based on the location of the first or last alarm device is overcome, thereby improving the accuracy of fire location in the tunnel.

[0006] Optionally, when all the detection devices are of different types, the step of comprehensively calculating the fire origin location in the tunnel based on the alarm time and alarm location includes: Based on the alarm location, determine whether there is an overlapping area of ​​alarm locations. If so, determine whether there are overlapping alarm times within the overlapping area. If so, determine whether the alarm locations corresponding to the latest overlapping alarm times are the same. If they are the same, take the alarm location as the fire ignition location in the tunnel. If they are different, obtain the detection range of the detection device corresponding to the latest overlapping alarm time, and take the intersection of the detection ranges as the fire ignition location in the tunnel. Otherwise, take the alarm location corresponding to the latest alarm time as the fire ignition location in the tunnel.

[0007] As described above, the location of a fire is determined by overlapping both the alarm location and the alarm time. The alarm location corresponding to the latest overlapping alarm time within the overlapping area is then re-evaluated. If they differ, the intersection of the detection ranges of the detection devices corresponding to the latest overlapping alarm times is taken as the location of the fire, thereby improving the accuracy of fire location. Furthermore, the alarm location corresponding to the latest alarm time is used as the standard to ensure the timeliness of the alarm location.

[0008] Optionally, determining whether there are overlapping alarm times within the overlapping areas of the alarm locations includes: If they exist, calculate the time difference of each alarm time within the overlapping area of ​​the alarm locations, determine whether the alarm locations with the smallest time difference are the same, if they are the same, take the alarm location as the fire ignition location in the tunnel, if they are different, obtain the detection range of the detection device with the smallest time difference, calculate the intersection of the detection ranges, and take the intersection of the latest alarm times as the fire ignition location in the tunnel.

[0009] As described above, when alarm locations overlap, it is determined whether the alarm locations with the smallest time difference in the overlapping area are the same. If they are not the same, the intersection of the detection ranges of the detection devices with the smallest time difference in the latest alarm time is taken as the fire ignition location in the tunnel. The smallest time difference is close to time overlap, thereby improving the accuracy of fire ignition location.

[0010] Optionally, when all the detection devices are of the same type, the step of comprehensively calculating the fire origin location in the tunnel based on the alarm time and alarm location includes: Determine whether all the detection devices are of the same type. If so, obtain the total number of detection devices in the same direction within the tunnel, the distance interval between the alarm locations of each detection device, and the time interval between alarm times. Calculate the fire alarm confidence level based on the total number, the distance interval, and the time interval. =

[0011] in, Indicates the confidence level of a fire alarm. This represents the correction factor, N represents the total quantity, and d i t represents the maximum value of the distance interval, and t represents the sum of the time intervals; When the fire alarm confidence level reaches the alarm threshold, a fire is confirmed to have occurred in the tunnel. Based on the type of detection equipment, the location of the fire in the tunnel is calculated comprehensively according to the alarm time and alarm location.

[0012] As described above, when all detection devices are of the same type, i.e., when the detection devices are of a single type, the fire alarm confidence level is calculated based on the total number of detection devices, distance intervals, and time intervals. According to the formula, the more detection devices there are, the smaller the distance intervals and the shorter the time intervals, the higher the calculated fire alarm confidence level. A fire is only confirmed to have occurred in the tunnel when the fire alarm confidence level reaches the alarm threshold, thereby shielding fire alarm signals from scattered devices in the tunnel and reducing the false alarm rate.

[0013] Optionally, the step of comprehensively calculating the fire origin location within the tunnel based on the type of the detection device, according to the alarm time and alarm location, includes: When the type is a heat-sensitive flame detector or a light-sensitive flame detector, obtain the alarm location corresponding to the latest alarm time, and use the alarm location as the fire ignition location in the tunnel. When the type is a smoke detector or flame detector, the total number of the detection devices and the alarm location of each detection device are obtained, and the location of the fire is calculated based on the total number and alarm locations. Locate=

[0014] Where Locate represents the location of the fire originating in the tunnel, n represents the total number of detection devices, and P i This indicates the alarm position of detection device i, where i = 1…n.

[0015] As described above, different types of detection equipment result in different methods for locating the fire's origin. Since heat and light flame detectors continuously generate fire alarm signals as the fire source moves, the alarm location corresponding to the latest alarm time is taken as the fire's origin. Because smoke is diffusing and gradually deviates from the actual fire source, when the detection equipment is a smoke and flame detector, the total number of smoke and flame detectors and the alarm location of each detector are taken into account for comprehensive calculation. This ensures both the accuracy of the fire's origin location and the objectivity and flexibility of its location.

[0016] Optionally, the correction factor is 5.5. 10 4 .

[0017] Optionally, the confidence threshold is 60.

[0018] In a second aspect, the present invention provides a device for locating tunnel fires, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the method for locating tunnel fires as described in the first aspect.

[0019] The technical effects of the tunnel fire location device provided in the second aspect are described in the relevant description of the tunnel fire location method provided in the first aspect. Attached Figure Description

[0020] Figure 1 A flowchart illustrating a method for locating a tunnel fire, provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the overall process of a method for locating tunnel fires provided in an embodiment of the present invention; Figure 3 When the types of detection devices involved in the embodiments of the present invention are different, the same alarm position corresponding to the latest overlapping alarm time is used as the schematic diagram of the fire ignition location in the tunnel within the overlapping alarm position area; Figure 4 This is a schematic diagram illustrating how, when the types of detection devices involved in the embodiments of the present invention are different, the location of the fire in the tunnel is located within the overlapping area of ​​alarm locations based on the time difference of each alarm time. Figure 5 This is a schematic diagram of a tunnel fire location device provided in an embodiment of the present invention.

[0021] [Explanation of Labels in the Attached Image] 1. A device for locating tunnel fires; 2. Processor; 3. Memory. Detailed Implementation

[0022] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0023] Example 1 Please refer to Figures 1 to 4 This invention provides a method for locating tunnel fires, comprising the following steps: S1. Obtain the alarm time and location of all detection devices that have issued fire alarm signals in the tunnel; In this embodiment, the alarm position of the detection equipment is determined based on the equipment station number. The equipment station numbers of each detection equipment are pre-set along the tunnel's forward direction. The station number of the first detection equipment P1 at the starting point is K0, representing kilometer 0. The distance between the second detection equipment P2 and the first detection equipment P1 is x meters, so the station number of the second detection equipment P2 is set to K0 + x meters, representing the xth meter of kilometer 0. The distance between the third detection equipment P3 and the second detection equipment P2 is y meters, so the station number of the third detection equipment P3 is K0 + x meters + y meters, representing the x + yth meter of kilometer 0. This process continues until the total distance interval reaches 1000 meters, or 1 kilometer, at which point the next detection equipment P1 is activated. i The equipment station number is set to K1, representing the 1st kilometer. The equipment station number is set for each detection device in this cycle.

[0024] S2. Calculate the location of the fire in the tunnel based on the alarm time and alarm location.

[0025] At this point, step S2 includes: S20. Determine whether all the detection devices are of the same type. If not, proceed to step S21.

[0026] S21. Determine whether there is an overlapping area of ​​alarm locations based on the alarm locations. If there is, determine whether there are overlapping alarm times within the overlapping area of ​​alarm locations. If there are, determine whether the alarm locations corresponding to the latest overlapping alarm times are the same. If they are the same, take the alarm location as the fire ignition location in the tunnel. If they are different, obtain the detection range of the detection device corresponding to the latest overlapping alarm time, and take the intersection of the detection ranges as the fire ignition location in the tunnel. Otherwise, take the alarm location corresponding to the latest alarm time as the fire ignition location in the tunnel.

[0027] In this embodiment, as Figure 3 As shown, the detection equipment includes light-sensitive flame detectors, smoke-sensitive flame detectors, and heat-sensitive flame detectors. There are 5 light-sensitive flame detectors, designated P1, P2, P3, P4, and P5, with corresponding station numbers K12+300, K12+340, K12+400, K12+440, and K12+480. There are 6 smoke-sensitive flame detectors, designated P6, P7, P8, P9, and P12+480. 10 P 11 The corresponding equipment station numbers are: K12+360, K12+400, K12+440, K12+480, K12+540, and K12+580. There are 5 heat-sensitive flame detectors, namely P 12 P 13 P 14 P15 P 16 The corresponding equipment station numbers are: K12+260, K12+340, K12+380, K12+440, and K12+480. Based on the equipment station numbers and alarm locations of each detection device, the alarm location range for the light-sensitive flame detector is from K12+300 to K12+480, the alarm location range for the smoke-sensitive flame detector is from K12+360 to K12+580, and the alarm location range for the heat-sensitive flame detector is from K12+260 to K12+480. Therefore, there is an overlapping alarm location area from K12+360 to K12+480. Within this overlapping alarm location area, there are overlapping alarm times, with the latest overlapping alarm time being 12:00:14. The detection devices corresponding to this latest overlapping alarm time are: P5 and P... 16 P5 and P 16 The alarm locations are the same, therefore the fire location inside the tunnel is: K12+480, that is, 480 meters at the 12th kilometer mark.

[0028] At this time, the step S21 of determining whether there are overlapping alarm times within the overlapping area of ​​the alarm locations includes: S211. If it exists, calculate the time difference of each alarm time within the overlapping area of ​​the alarm locations, determine whether the alarm locations with the smallest time difference are the same, if they are the same, take the alarm location as the fire ignition location in the tunnel, if they are different, obtain the detection range of the detection device with the smallest time difference, calculate the intersection of the detection ranges, and take the intersection of the latest alarm times as the fire ignition location in the tunnel.

[0029] In this embodiment, as Figure 4 As shown, the detection equipment includes light-sensitive flame detectors, smoke-sensitive flame detectors, and heat-sensitive flame detectors. There are 5 light-sensitive flame detectors, designated P1, P2, P3, P4, and P5, with corresponding station numbers K12+300, K12+340, K12+400, K12+440, and K12+480. There are 6 smoke-sensitive flame detectors, designated P6, P7, P8, P9, and P12+480. 10 P 11The corresponding equipment station numbers are: K12+360, K12+400, K12+440, K12+480, K12+540, and K12+580. Based on the equipment station numbers and alarm locations of each detection device, the alarm location range for the light-sensitive flame detector is from K12+300 to K12+480, and the alarm location range for the smoke-sensitive flame detector is from K12+360 to K12+580. Therefore, there is an overlapping alarm location area from K12+360 to K12+480. Within this overlapping alarm location area, the alarm time for each light-sensitive flame detector is: the alarm time for P2 is 12: The alarm times for P3 are 12:00:08, P4 is 12:00:11, and P5 is 12:00:14. The alarm times for each smoke and flame detector are: P6 is 12:00:10, P7 is 12:00:13, P8 is 12:00:16, and P9 is 12:00:19. The time difference between the alarm times of each light-sensitive flame detector and the smoke-sensitive flame detector is: P6-P2=6s, P6-P3=2s, P6-P4=1s, P6-P5=4s. Given P7-P2=9s, P7-P3=5s, P7-P4=2s, P7-P5=1s, P8-P2=12s, P8-P3=8s, P8-P4=5s, P8-P5=2s, P9-P2=15s, P9-P3=11s, P9-P4=8s, and P9-P5=5s, the minimum time difference is 1s, corresponding to P6-P4=1s and P7-P5=1s. The alarm locations for P4, P5, P6, and P7 are all different. The detection ranges of the detection devices for P4, P5, P6, and P7 are obtained. The detection range of each detection device is pre-set to 40. If the detection range of P4 is [K12+400-40, K12+400+40], the detection range of P5 is [K12+480-40, K12+480+40], the detection range of P6 is [K12+360-40, K12+360+40], and the detection range of P7 is [K12+400-40, K12+400+40]. The intersection of the detection ranges of the latest alarm time is K12+440. Therefore, the location of the fire in the tunnel is K12+440, which is 440 meters at kilometer 12.

[0030] Example 2 Please refer to Figures 1 to 4 The present invention provides a method for locating tunnel fires. Based on the above embodiment one, step S20 of this embodiment further includes: If so, proceed to step S22; In step S20, if all detection devices are of different types, fire location and early warning are performed according to the method in step S21. If all detection devices are of the same type, fire location and early warning are performed according to step S22 and subsequent step S23, as detailed below: S22. Determine whether all the detection devices are of the same type. If so, obtain the total number of detection devices in the same direction within the tunnel, the distance interval between the alarm positions of each detection device, and the time interval between alarm times. Calculate the fire alarm confidence level based on the total number, the distance interval, and the time interval. =

[0031] in, Indicates the confidence level of a fire alarm. This represents the correction factor, N represents the total quantity, and d i t represents the maximum value of the distance interval, and t represents the sum of the time intervals; In this embodiment, as Figure 2 As shown, when all detection devices are of the same type, the distance interval between alarm locations and the time interval between alarm times for each detection device are obtained. The maximum value of the distance interval is taken, and the sum of the time intervals is calculated. This sum is then substituted into the formula to calculate the fire alarm confidence level, where the correction coefficient is set to 5.5. 10 4 The correction factor can be adjusted according to the actual situation.

[0032] In one specific embodiment, all detection devices are of the same type: heat-sensitive flame detectors. The total number of detectors in the same direction within the tunnel is 5. The alarm locations of each detector are, in order: K12+200, K12+280, K12+320, K12+360, and K12+400. The alarm time intervals are 9 seconds, 13 seconds, 21 seconds, 27 seconds, and 30 seconds, respectively. Therefore, the maximum distance interval is 200, the sum of the time intervals is 100, and α = 5.5. 10 4 (5) 2 / (200) 100)) = 68.75, meaning the fire alarm confidence level is 68.75.

[0033] S23. When the fire alarm confidence level reaches the alarm threshold, a fire is confirmed to have occurred in the tunnel. Based on the type of the detection equipment, the fire ignition location in the tunnel is calculated comprehensively according to the alarm time and alarm location.

[0034] In this embodiment, as Figure 2As shown, when the fire alarm confidence level reaches the alarm threshold, it is confirmed that a fire has occurred in the tunnel. At this time, the alarm threshold is set to 60. The alarm threshold can be adjusted according to the actual situation. The fire alarm confidence level calculated in step S22 is 68.75. 68.75 is greater than 60, that is, the fire alarm confidence level reaches the alarm threshold, and it is confirmed that a fire has occurred in the tunnel.

[0035] At this point, step S23, which involves comprehensively calculating the fire origin location within the tunnel based on the type of the detection device, the alarm time, and the alarm location, includes: S231. When the type is a heat-sensitive flame detector or a light-sensitive flame detector, obtain the alarm location corresponding to the latest alarm time, and use the alarm location as the fire ignition location in the tunnel. In this embodiment, when all detection devices are of the same type and are either heat-sensitive flame detectors or light-sensitive flame detectors, the alarm location corresponding to the latest alarm time is taken as the fire ignition location in the tunnel. For example, the alarm locations of each heat-sensitive flame detector are arranged in ascending order of alarm time as follows: K12+200, K12+280, K12+320, K12+360, K12+400. That is, the alarm location corresponding to the latest alarm time is K12+400, and K12+400 is the fire ignition location in the tunnel.

[0036] S232. When the type is a smoke detector or flame detector, obtain the total number of the detection devices and the alarm location of each detection device, and calculate the fire origin location based on the total number and alarm location: Locate=

[0037] Where Locate represents the location of the fire originating in the tunnel, n represents the total number of detection devices, and P i This indicates the alarm position of detection device i, where i = 1…n.

[0038] In this embodiment, when all detection devices are of the same type and are smoke and flame detectors, the alarm positions of each detector and the total number of detectors are obtained to calculate the fire ignition location. For example, if the total number of smoke and flame detectors is 4, the alarm positions of each smoke and flame detector are as follows: K12+400, K12+480, K12+560, K12+640. Locate = (K12+400+K12+480+K12+560+K12+640) / 4 = K12+520, that is, the fire ignition location in the tunnel is K12+520.

[0039] Example 3 Please refer to Figure 5A device 1 for locating tunnel fires includes a memory 3, a processor 2, and a computer program stored in the memory 3 and executable on the processor 2. When the processor 2 executes the computer program, it implements the steps in Embodiment 1 and Embodiment 2 described above.

[0040] Since the systems / devices described in the above embodiments of the present invention are systems / devices used to implement the methods of the above embodiments of the present invention, those skilled in the art can understand the specific structure and modifications of the systems / devices based on the methods described in the above embodiments of the present invention, and therefore will not be repeated here. All systems / devices used in the methods of the above embodiments of the present invention fall within the scope of protection of the present invention.

[0041] Those skilled in the art will understand that 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 completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0042] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, as well as combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions.

[0043] It should be noted that any reference numerals placed between parentheses in the claims should not be construed as limiting the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "a" or "an" preceding a component does not exclude the presence of a plurality of such components. The invention can be implemented by means of hardware comprising several different components and by means of a suitably programmed computer. In claims that enumerate several means, several of these means may be embodied by the same hardware. The use of the terms first, second, third, etc., is merely for convenience of expression and does not indicate any order. These terms can be understood as part of the component names.

[0044] Furthermore, it should be noted that in the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0045] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the claims should be interpreted to include both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0046] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, then this invention should also include these modifications and variations.

Claims

1. A method for locating tunnel fires, characterized in that, include: Acquire the alarm time and location of all detection devices that issued fire alarm signals inside the tunnel; The location of the fire within the tunnel is calculated by comprehensively considering the alarm time and alarm location. When all the detection devices are of different types, the step of comprehensively calculating the fire origin location in the tunnel based on the alarm time and alarm location includes: Based on the alarm location, determine whether there is an overlapping area of ​​alarm locations. If there is an overlapping area of ​​alarm locations, determine whether there are overlapping alarm times within the overlapping area of ​​alarm locations. If there are overlapping alarm times, determine whether the alarm locations corresponding to the latest overlapping alarm times are the same. If the alarm locations corresponding to the latest overlapping alarm times are the same, then the alarm location is taken as the fire ignition location in the tunnel. If the alarm locations corresponding to the latest overlapping alarm times are different, then obtain the detection range of the detection device corresponding to the latest overlapping alarm time, and take the intersection of the detection ranges as the fire ignition location in the tunnel. If there is no overlapping area of ​​alarm locations, take the alarm location corresponding to the latest alarm time as the fire ignition location in the tunnel. When all the detection devices are of the same type, the step of comprehensively calculating the fire origin location in the tunnel based on the alarm time and alarm location includes: Obtain the total number of detection devices in the same direction within the tunnel, the distance interval between the alarm locations of each detection device, and the time interval between alarm times. Calculate the fire alarm confidence level based on the total number, the distance interval, and the time interval. = in, Indicates the confidence level of a fire alarm. This represents the correction factor, N represents the total quantity, and d i t represents the maximum value of the distance interval, and t represents the sum of the time intervals; When the fire alarm confidence level reaches the alarm threshold, a fire is confirmed to have occurred in the tunnel. Based on the type of detection equipment, the location of the fire in the tunnel is calculated comprehensively according to the alarm time and alarm location.

2. The method for locating a tunnel fire as described in claim 1, characterized in that, The determination of whether there are overlapping alarm times within the overlapping areas of the alarm locations includes: If there are no overlapping alarm times, the time difference of each alarm time within the overlapping area of ​​the alarm locations is calculated, and it is determined whether the alarm locations with the smallest time difference are the same. If the alarm locations with the smallest time difference are the same, the alarm location is taken as the fire ignition location in the tunnel. If the alarm locations with the smallest time difference are different, the detection range of the detection device with the smallest time difference is obtained, the intersection of the detection ranges is calculated, and the intersection of the latest alarm times is taken as the fire ignition location in the tunnel.

3. The method for locating a tunnel fire as described in claim 1, characterized in that, The calculation of the fire origin location within the tunnel based on the type of detection equipment, the alarm time, and the alarm location includes: When the type is a heat-sensitive flame detector or a light-sensitive flame detector, obtain the alarm location corresponding to the latest alarm time, and use the alarm location as the fire ignition location in the tunnel. When the type is a smoke detector or flame detector, the total number of the detection devices and the alarm location of each detection device are obtained, and the location of the fire is calculated based on the total number and alarm locations. Locate= Where Locate represents the location of the fire originating in the tunnel, n represents the total number of detection devices, and P i This indicates the alarm position of detection device i, where i = 1…n.

4. The method for locating a tunnel fire as described in claim 1, characterized in that, The correction factor is 5.

5. 10 4 .

5. The method for locating a tunnel fire as described in claim 1, characterized in that, The confidence threshold is 60.

6. A device for locating tunnel fires, characterized in that, The invention includes a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that the processor, when executing the computer program, implements the method as described in any one of claims 1 to 5.

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