Train fire alarm system and control method

Abstract

The invention provides a train fire alarm system and a control method. The train fire alarm system comprises a bus communication line, a plurality of detection units, two fire alarm control units and a fire extinguishing execution unit. The plurality of detection units are arranged on a bus communication line in series, and are suitable for sending out an alarm signal after detecting that a fire exists in a compartment or a cab. The two fire alarm control units are respectively arranged in driver's cabins at two ends of a train, are powered by a power supply, are connected in series with the plurality of detection units through a bus communication line, and are configured to display early warning information after receiving an alarm signal for the first time; and after the alarm signal is received for the second time within the first preset time, the alarm information is displayed as fire alarm information. And the fire extinguishing execution unit is connected with the fire alarm control unit through a bus communication line, and is configured to execute a fire extinguishing action after receiving the fire alarm information.

Description

Technical Field

[0001] The present disclosure relates to the field of rail transit equipment safety technology and the field of rail trains, and more specifically, to a train fire alarm system and a control method. Background Art

[0002] With the rapid development of social economy, large public places are increasing day by day, and the frequency of fire accidents is also increasing. In order to protect the lives and property of the people, the fire alarm system plays a vital role in the field of fire safety. The fire alarm system is an intelligent safety prevention system that integrates fire monitoring, alarm and control. It mainly detects the characteristic parameters such as smoke, temperature, flame, etc. generated when a fire occurs, sends out alarm signals in time, notifies personnel to evacuate, and starts fire extinguishing equipment, thereby reducing the losses caused by the fire.

[0003] Nowadays, the passenger capacity of rail trains is increasing, and their running speed is also increasing, so fire safety on trains is extremely important. In the train fire alarm system, the main functions include: train fire monitoring technology, train-specific signal transmission technology, linkage control technology, intelligent analysis and decision-making technology, and passenger emergency evacuation guidance technology. Through the comprehensive application of these technologies, the train fire alarm system can not only detect and deal with fire hazards in a timely manner, but also quickly take rescue measures when a fire occurs, greatly improving the safety level of train operation.

[0004] In the related art, the train fire alarm system usually adopts bus communication, and the detectors in the carriage are directly connected in series to the bus line, or connected to the bus line in a bus topology. When a detector sends out an alarm signal, the controller in the driver's cab will receive the alarm signal, and combined with the real-time monitoring screen, it will determine whether there is a fire and the size of the fire, and then select the corresponding processing method. However, in the actual operation process, there are often false alarms, especially for some lines with longer mileage. If false alarms occur frequently, it is easy to distract the driver's attention, seriously affecting the driver's control of the train and the normal operation of the train. Therefore, how to reduce the impact of false alarms in the train fire alarm system has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] In view of this, the present disclosure provides a train fire alarm system and a control method.

[0006] One aspect of the present disclosure provides a train fire alarm system, comprising: a bus communication line; a plurality of detection units, arranged in series on the bus communication line, and adapted to send out an alarm signal after detecting a fire in a carriage or a driver's cab; two fire alarm control units, respectively arranged in the driver's cab at both ends of the train, powered by a power supply and connected in series with the plurality of detection units via the bus communication line, the fire alarm control unit being configured to display a warning message after receiving the alarm signal for the first time, and to display a fire alarm message after receiving the alarm signal for the second time within a first preset time; a fire extinguishing execution unit, connected to the fire alarm control unit via the bus communication line, and configured to execute a fire extinguishing action after receiving the fire alarm message.

[0007] According to an embodiment of the present disclosure, in a first state of normal operation of the system, one of the two fire alarm control units communicates with the detection unit via the bus communication line.

[0008] According to an embodiment of the present disclosure, it also includes: a plurality of short-circuit isolation units, which are arranged in series on the above-mentioned bus communication line, each of the above-mentioned short-circuit isolation units is arranged between two adjacent carriages, and is configured to cut off the connection between the above-mentioned detection unit in the carriage and the above-mentioned bus communication line when a short-circuit fault is detected in the above-mentioned detection unit in the carriage.

[0009] According to an embodiment of the present disclosure, in the second state where a short circuit exists in the system, the two fire alarm control units communicate with the short-circuit isolation units on both sides of the cut-off carriage respectively to maintain system operation.

[0010] According to an embodiment of the present disclosure, the plurality of detection units mentioned above include at least one aspirating smoke-temperature composite detector and at least one point-type smoke-temperature composite detector.

[0011] According to an embodiment of the present disclosure, the installation locations of the above-mentioned point-type smoke and temperature composite detectors include electrical cabinets and toilets.

[0012] According to an embodiment of the present disclosure, the above-mentioned aspirating smoke and temperature composite detector is installed in the passenger compartment and the driver's compartment.

[0013] According to an embodiment of the present disclosure, the fire alarm control unit includes: a fire alarm controller, adapted to receive an alarm signal from the detection unit; a train control management system, adapted to obtain and display the status of the fire alarm controller, and control the fire extinguishing execution unit to execute a fire extinguishing action.

[0014] According to an embodiment of the present disclosure, the fire alarm control unit further includes an on-board switch adapted to provide a data transmission channel for the train control management system so as to communicate within the train or with an external network.

[0015] Another aspect of the present disclosure provides a rail train, including a car body, on which the train fire alarm system in any of the above embodiments is installed.

[0016] Another aspect of the present disclosure provides a train fire alarm system control method, which adopts the train fire alarm system in any of the above embodiments, including: after the train is powered on, the system performs a self-check; after the fire alarm control unit receives the alarm signal from the detection unit, it displays it as a warning message; the fire alarm control unit monitors whether a second alarm signal is received within the next first preset time. When the fire alarm control unit receives the second alarm signal, it displays it as a fire alarm message and sends a fire alarm signal to the fire extinguishing execution unit. The fire extinguishing execution unit executes the fire extinguishing action.

[0017] According to an embodiment of the present disclosure, the fire alarm control unit further includes: if the fire alarm control unit does not receive the second alarm signal within the next first preset time, the warning information is recorded in the system. The fire alarm control unit continues to monitor whether the second alarm signal is received within the second preset time. If the fire alarm control unit does not receive the second alarm signal, the monitoring is terminated and the warning information is marked as a false alarm. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and other objects, features and advantages of the present disclosure will become more apparent through the following description of the embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0019] Figure 1 is a schematic diagram of a train fire alarm system provided by the present disclosure;

[0020] Figure 2 yes Figure 1 A schematic diagram of the principle of a short-circuit isolation unit in the exemplary embodiment shown;

[0021] Figure 3 It is a flow chart of the train fire alarm system control method provided by the present disclosure.

[0022] In the drawings, the meanings of the reference numerals are as follows:

[0023] 1. Detection unit;

[0024] 11. Aspirating smoke temperature composite detector;

[0025] 12. Point type smoke temperature composite detector;

[0026] 2. Fire alarm control unit;

[0027] 21. Fire alarm controller;

[0028] 22. Train control management system;

[0029] 23. On-board switch;

[0030] 3. Short circuit isolation unit;

[0031] 31. Isolation module;

[0032] 32. Detection module;

[0033] 33. Interface. DETAILED DESCRIPTION

[0034] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present disclosure. In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present disclosure. However, it is apparent that one or more embodiments may also be implemented without these specific details. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present disclosure.

[0035] The terms used herein are only for describing specific embodiments and are not intended to limit the present disclosure. The terms "comprise", "include", etc. used herein indicate the existence of the features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0036] All terms (including technical and scientific terms) used herein have the meanings commonly understood by those skilled in the art unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly rigid manner.

[0037] When using expressions such as "at least one of A, B, and C, etc.", they should generally be interpreted according to the meaning of the expression commonly understood by those skilled in the art (for example, "a system having at least one of A, B, and C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.).

[0038] Figure 1 is a schematic diagram of a train fire alarm system provided by the present disclosure, Figure 2 yes Figure 1 A schematic diagram of a short-circuit isolation unit in an exemplary embodiment is shown.

[0039] The embodiment of the present disclosure provides a train fire alarm system, such as Figure 1As shown, it includes a bus communication line, multiple detection units 1, two fire alarm control units 2 and a fire extinguishing execution unit. Multiple detection units 1 are arranged in series on the bus communication line, and are suitable for sending an alarm signal after detecting the presence of a fire in a carriage or a driver's cab. Two fire alarm control units 2 are respectively arranged in the driver's cab at both ends of the train, powered by a power supply and connected in series with multiple detection units 1 through a bus communication line, and the fire alarm control unit 2 is configured to display a warning message after receiving the alarm signal for the first time, and display a fire alarm message after receiving the alarm signal for the second time within a first preset time. The fire extinguishing execution unit is connected to the fire alarm control unit 2 through a bus communication line, and is configured to perform a fire extinguishing action after receiving the fire alarm message.

[0040] In such an implementation, the train consists of two driver's cab head cars and multiple intermediate cars between the two head cars. Two fire alarm control units 2 are respectively arranged in the driver's cab, and multiple detection units 1 are distributed in the intermediate cars and the driver's cab, and are connected in series through a bus communication line. After detecting an abnormality, the detection unit 1 sends an alarm signal to the fire alarm control unit 2, and the fire alarm control unit 2 displays the alarm signal as a warning message. If the detection unit 1 sends an alarm signal to the fire alarm control unit 2 again within the next first preset time, the fire alarm control unit 2 displays or marks the second alarm signal as a fire alarm message, and uploads the fire alarm message to the fire extinguishing execution unit. After receiving the fire alarm message, the fire extinguishing execution unit executes the fire extinguishing action. In this way, the fire alarm control unit 2 replaces the driver to perform part of the information processing, and the driver does not need to pay too much attention to the warning message. When the fire alarm control unit 2 displays the fire alarm message, it takes over the control, which effectively reduces the impact of false alarms and improves the safety of train operation.

[0041] According to an embodiment of the present disclosure, the first preset time includes but is not limited to 5 seconds. When the fire alarm control unit 2 receives the first alarm signal, it displays a warning message and continues to monitor the detection unit 1 and the surrounding adjacent detection units 1 within the next 5 seconds. If a second alarm signal is received, it displays a fire alarm message and reports a fire alarm.

[0042] Furthermore, if the second alarm signal is not received within the next 5 seconds, the warning information is recorded in the system, and the detection unit 1 and the surrounding adjacent detection units 1 are continuously monitored for a second preset time. If the second alarm signal is received within the second preset time, the no fire alarm information is displayed and the fire alarm is reported; if the second alarm signal is still not received, the monitoring is terminated. Exemplarily, the second preset time includes but is not limited to 5 seconds.

[0043] In the embodiment of the present disclosure, the bus communication line used by the train fire alarm system is a two-bus system, which combines the power line and the signal line into one, so that the signal and power supply share one bus, saving cable costs, reducing the difficulty of wiring construction, and simplifying maintenance work.

[0044] According to an embodiment of the present disclosure, in a first state of normal system operation, one of the two fire alarm control units 2 communicates with the detection unit 1 through a bus communication line.

[0045] In such an implementation, the train fire alarm system is provided with a fire alarm control unit 2 in the driver's cab at both ends of the train, and the two are hot standby redundant to each other. In the first state of normal operation, one of the fire alarm control units 2 can maintain communication connection with the detection unit 1 of the entire vehicle; when a circuit break occurs in the line, the other fire alarm control unit 2 can be enabled, so that the lines on both sides of the circuit break position can respectively maintain communication connection with the fire alarm control unit 2 on the same side to maintain the normal operation of the entire train fire alarm system. At the same time, the fire alarm control unit 2 can display the characteristic information of the detection unit 1 that currently maintains effective communication (such as the communication address), or display the current circuit break position, and the reasons for the circuit break include but are not limited to the interruption of the connection between the two detection units 1, the interruption of the internal connection of the detection unit 1, or the lack of the detection unit 1, so as to timely determine the circuit break position and perform maintenance to prevent safety hazards.

[0046] In an exemplary embodiment, the train fire alarm system also includes a plurality of short-circuit isolation units 3, which are arranged in series on a bus communication line. Each short-circuit isolation unit 3 is disposed between two adjacent carriages and is configured to cut off the connection between the detection unit 1 in the carriage and the bus communication line when a short-circuit fault is detected in the detection unit 1 in the carriage.

[0047] In such an embodiment, a short-circuit isolation unit 3 is provided at the connection between two adjacent carriages. Here, the short-circuit isolation unit 3 on the left side of the carriage is taken as the first isolation unit, and the short-circuit isolation unit 3 on the right side of the carriage is taken as the second isolation unit. When a short circuit occurs in the detection unit 1 inside the carriage, the first isolation unit cuts off the connection between the first isolation unit and the carriage after detecting the abnormal current; similarly, the second isolation unit cuts off the connection between the second isolation unit and the carriage after detecting the abnormal current. This arrangement is to prevent the short circuit from affecting the entire bus communication line and causing system paralysis.

[0048] Further, according to an embodiment of the present disclosure, in the second state where a short circuit exists in the system, the other two fire alarm control units 2 communicate with the short-circuit isolation units 3 on both sides of the cut-off carriage respectively to maintain the operation of the system.

[0049] In such an implementation, the fire alarm control unit 2 on the same side as the first isolation unit serves as the first control unit, and the fire alarm control unit on the same side as the second isolation unit serves as the second control unit. When the connection between the first isolation unit and the faulty carriage is cut off, the first control unit maintains a communication connection with the first isolation unit; similarly, when the connection between the second isolation unit and the faulty carriage is cut off, the second control unit maintains a communication connection with the second isolation unit to maintain normal operation of the system while waiting for the staff to troubleshoot the short circuit fault.

[0050] In some other embodiments, more short-circuit isolation units 3 may be configured in the system with shorter intervals, for example, one short-circuit isolation unit 3 may be configured for every two detection units 1. This can further reduce the impact of short-circuit faults, improve isolation accuracy, and facilitate troubleshooting and maintenance.

[0051] The following will take the example of configuring a short-circuit isolation unit 3 for every other detection unit 1 to briefly describe the isolation principle of the short-circuit isolation unit 3 .

[0052] like Figure 2 As shown, the short circuit isolation unit 3 includes an isolation module 31, a detection module 32 and two interfaces 33. Under normal operating conditions, the two interfaces 33 are respectively connected to the detection unit 1 through signal lines, and the isolation module 31 is in a state of connecting the two interfaces 33. The detection module 32 is powered by a 24V DC power supply and shares the power supply with the fire alarm control unit 2. When the detection module 32 detects that the current / voltage on the signal line is abnormal, the connection between the two interfaces 33 is cut off and a short circuit fault signal is issued. After the maintenance is completed, the isolation module 31 is manually reset to reconnect the two interfaces 33.

[0053] It should be noted here that Figure 2 The high-order data line and the low-order data line shown in the figure are only a connection method used to connect the short-circuit isolation unit 3 and the detection unit 1 when explaining the isolation principle of the short-circuit isolation unit 3. In the train fire alarm system provided by the present invention, the connection method between the detection unit 1, the fire alarm control unit 2 and the short-circuit isolation unit 3 is not limited to this.

[0054] In an exemplary embodiment, the plurality of detection units 1 include at least one aspirating smoke and temperature composite detector 11 and at least one point smoke and temperature composite detector 12 .

[0055] In such an implementation, the point-type smoke and temperature composite detector integrates the smoke and temperature sensing functions into one detector, and adopts a composite detection method to improve the accuracy and reliability of the alarm. Due to the special space inside the train, the point-type smoke and temperature composite detector can save the number of detectors, reduce space occupation, simplify line layout, and also reduce the safety hazards caused by line failures in the alarm system. In addition, the high sensitivity of the point-type smoke and temperature composite detector can also better meet the high requirements of train fire protection. The aspirating smoke and temperature composite detector adopts an active aspirating sampling method, which can better adapt to the train environment. For example, the interior of the train is usually a constant temperature environment, with continuous output of cold / heating, large air flow, and fast flow rate.

[0056] Furthermore, at least one aspirating smoke-temperature composite detector 11 and at least one point-type smoke-temperature composite detector 12 are arranged inside each carriage.

[0057] According to an embodiment of the present disclosure, the installation locations of the point-type smoke and temperature composite detector 12 include electrical cabinets and toilets.

[0058] In such an implementation, the electrical cabinet and toilet are both relatively narrow spaces with strong enclosure. The causes of fire are relatively complex, and there are both smoldering and instantaneous fires. Therefore, a point-type smoke and temperature composite detector is set.

[0059] It should be noted that the location of the point-type smoke and temperature composite detector 12 is not limited to the scope defined in the above embodiment. Other relatively narrow spaces on the train, such as the crew room, the catering room, etc., can also be equipped with the point-type smoke and temperature composite detector 12.

[0060] In an exemplary embodiment, the aspirating smoke and temperature composite detector 11 is installed in the passenger compartment and the driver's compartment.

[0061] In such an implementation, the passenger compartment and the driver's compartment have large spaces and fast air circulation, and active air sampling is required to improve the accuracy of the alarm.

[0062] More specifically, the aspirating smoke and temperature composite detector 11 is arranged near the return air outlet of the air conditioner.

[0063] It should be noted that the installation position of the aspirating smoke and temperature composite detector 11 is not limited to the scope defined in the above embodiment, and can be installed in other areas with high air flow on the train, such as the corridor between carriages, etc.

[0064] In some other embodiments, for locations such as the driver's cab and the passenger compartment where the personnel situation is complex and the fire protection requirements are high, a mixed configuration of the point-type smoke and temperature composite detector 12 and the aspirating smoke and temperature composite detector 11 is adopted.

[0065] It should be noted that the specific number and arrangement positions of the air-inhaling smoke temperature composite detector 11 and the point-type smoke temperature composite detector 12 given in the above embodiments are only described as preferred embodiments and are not intended to limit the scope of the present disclosure. Those skilled in the art can understand that when faced with different types of trains and different configuration requirements, the number and position of the air-inhaling smoke temperature composite detector 11 and the point-type smoke temperature composite detector 12 can be adjusted as needed, and these adjustments should fall within the scope of the present disclosure.

[0066] In some other embodiments, the detection unit 1 is also configured to adjust the alarm sensitivity in response to changes in environmental conditions, such as appropriately increasing the alarm threshold in areas with more sand and dust, and appropriately lowering the alarm threshold in cleaner environmental conditions. Specifically, the detection unit 1 can periodically update the detected smoke pollution background value, that is, the reference value of the smoke alarm. Depending on the different environmental conditions of the train and the accumulation of the train's running time, relying only on a fixed reference value for alarming can easily lead to more false alarms. The detection unit 1 has an initial background value, and each detection cycle calculates a new background value based on the pollution value and the current background value. The pollution value is obtained by detecting the dust particle density through the sensor.

[0067] The first alarm threshold is a preset fire alarm threshold. When the difference between the detected smoke concentration and the new background value is greater than the first alarm threshold, it means that the smoke concentration in the current detection range is large, a fire has occurred, and an alarm signal is issued.

[0068] The second alarm threshold is a preset maintenance threshold. If the calculated new background value is greater than the second alarm threshold, it means that there is too much dust in the detector and the new background value exceeds the standard. Then a signal is sent to the fire alarm control unit 2 to remind timely maintenance.

[0069] In an exemplary embodiment, the fire alarm control unit 2 includes a fire alarm controller 21 and a train control management system 22. The fire alarm controller 21 is adapted to receive an alarm signal from the detection unit 1. The train control management system is adapted to obtain and display the state of the fire alarm controller 21, and control the fire extinguishing execution unit to execute a fire extinguishing action.

[0070] In such an implementation, the fire alarm controller 21 is powered by a power supply on the train, and transmits signals with the detection unit 1 through a bus communication line. The train control management system 22 is applied to the control console of the train, and can obtain or receive the warning information / fire alarm information of the fire alarm controller 21. For the fire alarm information, the fire extinguishing execution unit can be automatically controlled to execute the fire extinguishing action, or the driver can take over the control. The false alarm warning information can be deleted or recorded for the basis of train maintenance.

[0071] When the train control management system 22 receives the fire alarm information, the console display screen triggers the fire alarm linkage, displays the fire alarm information of the fire alarm area video information machine, and pops up the active fire extinguishing button. After the driver confirms the fire, he broadcasts the alarm and presses the trigger perfluorohexanone fire extinguishing device to spray and complete the fire extinguishing.

[0072] In an exemplary embodiment, the amount of perfluorohexanone can be calculated by the following formula: (1)

[0073] (2)

[0074] Wherein, m is the design dosage of the fire extinguishing agent (perfluorohexanone), in kilograms. V is the net volume of the protected area, in cubic meters. S is the specific volume of perfluorohexanone vapor, in kilograms per cubic meter. T is the minimum ambient temperature in the protection area, in degrees Celsius. k1 is the value of the first altitude correction coefficient, which is 0.0664 in this embodiment. k2 is the value of the second altitude correction coefficient, which is 0.000274 in this embodiment. C is the design concentration of perfluorohexanone. When the protection area is in a non-sealed state, the dosage can be appropriately increased.

[0075] Exemplarily, the fire alarm controller 21 integrates a main control display module, a communication module, an I / O module, a power module, etc., and the outer shell is a standard 3U chassis. The modular design is easy to replace.

[0076] Furthermore, the fire alarm controller 21 and the detection unit 1 use FSK (Frequency ShiftKeying) communication technology, which represents different digital information by changing the frequency of the signal, has strong anti-interference ability, and low cost and energy consumption. The fire alarm controller 21 and the train control management system 22 use MVB (Multifunction Vehicle Bus) bus communication, which has a dual-channel redundant communication mode, and has high reliability and response speed.

[0077] According to an embodiment of the present disclosure, the fire alarm control unit 2 further includes an onboard switch 23 adapted to provide a data transmission channel for the train control management system 22 to communicate within the train or with an external network.

[0078] In such an implementation, information from the train control management system 22, including but not limited to fire alarm information, is sent to the on-board switch 23 via Ethernet communication, and then sent by the on-board switch to the ground fire alarm system to link ground fire-fighting facilities to participate in firefighting.

[0079] An exemplary embodiment of the present disclosure further provides a rail train, including a car body, on which is installed a train fire alarm system as in any of the above embodiments.

[0080] Figure 3 It is a flow chart of the train fire alarm system control method provided by the present disclosure.

[0081] The exemplary embodiment of the present disclosure also provides a train fire alarm system control method, using the train fire alarm system in any of the above embodiments, such as Figure 3 As shown, steps S100-S400 are included.

[0082] Step S100: After the train is powered on, the system performs a self-check.

[0083] Step S200: After receiving the alarm signal from the detection unit 1, the fire alarm control unit 2 displays it as early warning information.

[0084] Step S300: The fire alarm control unit 2 monitors whether a second alarm signal is received within the next first preset time.

[0085] Step S400: When the fire alarm control unit 2 receives the second alarm signal, it displays it as fire alarm information and sends a fire alarm signal to the fire extinguishing execution unit.

[0086] Step S500: The fire extinguishing execution unit executes a fire extinguishing action.

[0087] In step S100, the self-check includes but is not limited to checking the console display, indicator lights, buzzer, detection unit 1 and other parts.

[0088] According to an embodiment of the present disclosure, it also includes:

[0089] Step S310: If the fire alarm control unit 2 does not receive a second alarm signal within the next first preset time, the warning information is recorded in the system.

[0090] Step S320: The fire alarm control unit 2 continues to monitor whether a second alarm signal is received within a second preset time.

[0091] Step S330: The fire alarm control unit 2 does not receive the second alarm signal, ends monitoring, and marks the warning information as a false alarm.

[0092] In step S330, after the monitoring is completed, the warning information is marked as a false alarm, and the detection unit 1 with the false alarm is reset to continue detecting the fire.

[0093] It will be appreciated by those skilled in the art that the features described in the various embodiments of the present disclosure may be combined and / or combined in a variety of ways, even if such combinations or combinations are not explicitly described in the present disclosure. In particular, without departing from the spirit and teachings of the present disclosure, the features described in the various embodiments of the present disclosure may be combined and / or combined in a variety of ways. All of these combinations and / or combinations fall within the scope of the present disclosure.

[0094] The embodiments of the present disclosure are described above. However, these embodiments are only for illustrative purposes and are not intended to limit the scope of the present disclosure. Although the embodiments are described above, this does not mean that the measures in the various embodiments cannot be used in combination to advantage. Without departing from the scope of the present disclosure, those skilled in the art may make a variety of substitutions and modifications, which should all fall within the scope of the present disclosure.

Claims

1. A train fire alarm system, characterized in that: include: Bus communication line; A plurality of detection units (1) are arranged in series on the bus communication line and are adapted to send out an alarm signal after detecting a fire in a carriage or a driver's cab; Two fire alarm control units (2) are respectively arranged in the driver's cab at both ends of the train, powered by a power supply and connected in series with the plurality of detection units (1) via the bus communication line, the fire alarm control unit (2) being configured to display early warning information after receiving the alarm signal for the first time, and to display fire alarm information after receiving the alarm signal for the second time within a first preset time; A fire extinguishing execution unit is connected to the fire alarm control unit (2) via the bus communication line and is configured to execute a fire extinguishing action after receiving the fire alarm information.

2. The train fire alarm system according to claim 1, characterized in that: In a first state of normal system operation, one of the two fire alarm control units (2) communicates with the detection unit (1) via the bus communication line.

3. The train fire alarm system according to claim 2, characterized in that: Also includes: A plurality of short-circuit isolation units (3) are arranged in series on the bus communication line, each of the short-circuit isolation units (3) being arranged between two adjacent carriages and being configured to cut off the connection between the detection unit (1) in the carriage and the bus communication line when a short-circuit fault is detected in the detection unit (1) in the carriage.

4. The train fire alarm system according to claim 3, characterized in that: In the second state where a short circuit exists in the system, the two fire alarm control units (2) respectively communicate with the short circuit isolation units (3) on both sides of the cut-off carriage to maintain system operation.

5. The train fire alarm system according to claim 1, characterized in that: The plurality of detection units (1) include at least one aspirating smoke-temperature composite detector (11) and at least one point-type smoke-temperature composite detector (12).

6. The train fire alarm system according to claim 5, characterized in that: The point-type smoke and temperature composite detector (12) is installed in locations including an electrical cabinet and a toilet.

7. The train fire alarm system according to claim 5, characterized in that: The aspirating smoke and temperature composite detector (11) is arranged in the passenger compartment and the driver's compartment.

8. The train fire alarm system according to claim 1, characterized in that: The fire alarm control unit (2) comprises: A fire alarm controller (21), adapted to receive an alarm signal from the detection unit (1); The train control management system (22) is suitable for acquiring and displaying the state of the fire alarm controller (21), and controlling the fire extinguishing execution unit to execute a fire extinguishing action.

9. The train fire alarm system according to claim 8, characterized in that: The fire alarm control unit (2) also includes an onboard switch (23) adapted to provide a data transmission channel for the train control management system (22) so as to communicate within the train or with an external network.

10. A rail train, characterized in that: It comprises a car body, on which is mounted the train fire alarm system as described in any one of claims 1 to 9.

11. A train fire alarm system control method, characterized in that: A train fire alarm system according to any one of claims 1 to 10, comprising: After the train is powered on, the system performs a self-check; After the fire alarm control unit (2) receives the alarm signal from the detection unit (1), it displays it as early warning information; The fire alarm control unit (2) monitors whether a second alarm signal is received within a subsequent first preset time. When the fire alarm control unit (2) receives the second alarm signal, it displays it as fire alarm information and sends a fire alarm signal to the fire extinguishing execution unit. The fire extinguishing execution unit executes a fire extinguishing action.

12. The control method according to claim 11, characterized in that: Also includes: If the fire alarm control unit (2) does not receive a second alarm signal within the next first preset time, the early warning information is recorded in the system. The fire alarm control unit (2) continues to monitor whether a second alarm signal is received within a second preset time. The fire alarm control unit (2) does not receive the second alarm signal, ends monitoring, and marks the early warning information as a false alarm.

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