surveillance system

Abstract

To catch a sign of deterioration of a transmission system including signal lines connecting a reception panel and detectors so as to appropriately handle the same before a transmission fault occurs.SOLUTION: A disaster prevention reception panel 10 transmits an arbitrary signal to require a response to fire detectors 12 connected to signal lines 14a, 14b, and re-transmits an arbitrary signal if a response signal is not received, so as to require a response again. The disaster prevention panel 10 counts the number of times of accumulation of re-transmission with respect to the fire detectors 12 for each one of the signal lines 14a, 14b, and determines a deterioration sign of a transmission system including the signal lines 14a, 14b when a re-transmission occurrence rate satisfies a predetermined deterioration sign determination condition, so as to issue a report.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a monitoring system such as a tunnel disaster prevention system that monitors fires in a tunnel using a fire detector connected to a signal line drawn from a disaster prevention receiving panel. [Background technology]

[0002] 2. Description of the Related Art Conventionally, there is a tunnel disaster prevention system as a monitoring system for monitoring fire events as an abnormality in a tunnel, for example.

[0003] In this type of tunnel disaster prevention system, a detector (fire detector) that monitors fires is installed in tunnels on expressways, etc., to protect people and vehicles from fire accidents that occur inside the tunnel. This fire detector is connected to a signal line drawn from a receiving panel (disaster prevention receiving panel) installed in a control room, etc., to monitor for fires.

[0004] The fire detectors have detection areas on both the left and right sides, and are placed consecutively along the length of the tunnel, for example, at intervals of 25m or 50m, so that the detection areas of adjacent fire detectors overlap in a complementary manner.

[0005] In addition, the fire detector monitors radiation, such as infrared rays, from fire flames occurring inside the tunnel through a translucent window, and in order to maintain its flame monitoring function, sensitivity tests are conducted to check the sensitivity of the light-receiving element and dirt tests are conducted to monitor dirt on the translucent window.

[0006] However, with such conventional fire detectors, if they deteriorate over a long period of operation, even if they appear to be operating normally without any sensitivity problems detected in sensitivity tests or contamination problems detected in contamination tests, there is a possibility that the fire detector will output a fire detection signal and a non-fire alarm will be issued from the disaster prevention receiving panel.In such cases, until it is confirmed that the alarm is not a fire alarm, a no-entry alarm will be issued using an alarm display board or the like to prohibit vehicles from passing through the tunnel, and a person in charge will have to go to the site to check, which will take time and effort to reopen the tunnel and will have a significant impact, such as causing traffic congestion.

[0007] For this reason, a tunnel disaster prevention system has been proposed in which the disaster prevention receiving panel determines the degree of deterioration of the fire detector based on environmental stresses such as temperature, humidity, shock vibration, and electrical noise, and issues an alert.By being able to grasp the degree of deterioration of the fire detector, it is possible to take measures such as replacing the fire detector with a spare fire detector before a false fire alarm is issued.

[0008] In addition, in conventional tunnel disaster prevention systems, when the disaster prevention receiving panel receives a fire signal from a fire detector, the fire detector is temporarily restored after a specified time to prevent false fire alerts, and if a fire signal is received again within the specified time, it is determined to be a fire and a no-entry warning is issued using an alarm display board or other equipment. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-246962 [Patent Document 2] Japanese Patent Application Laid-Open No. 2016-128796 [Patent Document 3] Japanese Patent Application Publication No. 2018-169893 [Patent Document 4] Japanese Patent Application Laid-Open No. 2005-293344 [Patent Document 5] Japanese Patent Application Publication No. 2018-169893 [Patent Document 6] Japanese Patent Application Laid-Open No. 2002-352359 Summary of the Invention

[0010] In such conventional tunnel disaster prevention systems, if a signal line breaks or the like, causing an abnormality in transmission, this is detected as a transmission failure and an alarm is issued. However, over a long period of operation, the insulation of the signal line connecting the disaster prevention receiving panel and the fire detector gradually deteriorates, and although this does not result in a transmission failure such as a break, the signal quality of the transmission system may deteriorate, causing an abnormality in the transmission system in which signal transmission does not proceed normally.

[0011] However, abnormalities in the transmission system due to deterioration of the insulation of signal lines are not monitored on a daily basis, and there is a possibility that even if a fire breaks out inside the tunnel, the fire signal will not be received and a report will be lost. For this reason, it is necessary to monitor the progression of deterioration of the transmission system, including the signal lines.

[0012] The present invention aims to provide a monitoring system that can detect signs of deterioration in a transmission system, including the signal line connecting the receiving panel and the detector, and can take appropriate action before a transmission failure occurs. [Means for solving the problem]

[0013] (Tunnel Disaster Prevention System 1) The present invention is a monitoring system that monitors abnormalities by connecting a receiving panel and a detector with a signal line, The receiving board receives the signal via the signal line. a test instruction unit that transmits an arbitrary signal to the detector to request a response, and if the response signal is not received, retransmits the arbitrary signal to request a response again; a degradation sign determination unit that determines, for each signal line, whether there is a degradation sign of the transmission system including the signal line based on the number of retransmissions; Equipped with The deterioration sign determination unit is characterized in that when the cumulative number of retransmissions reaches a predetermined deterioration sign determination threshold number, it determines that there is a deterioration sign in the transmission system and issues a report.

[0014] (Tunnel Disaster Prevention System 2) The present invention is a monitoring system that monitors abnormalities by connecting a receiving panel and a detector with a signal line, The receiving board receives the signal via the signal line. a test instruction unit that transmits an arbitrary signal to the detector to request a response, and if the response signal is not received, retransmits the arbitrary signal to request a response again; a degradation sign determination unit that accumulates the number of retransmissions for each signal line, and when the accumulated number of retransmissions corresponding to any signal line satisfies a predetermined degradation sign determination condition, determines that the accumulated number of retransmissions corresponding to any signal line is a degradation sign of the transmission system including the signal line that satisfies the degradation determination condition; Equipped with The deterioration sign determination unit is characterized in that when the cumulative number of retransmissions reaches a predetermined deterioration sign determination threshold number, it determines that there is a deterioration sign in the transmission system and issues a report.

[0015] (Determining signs of deterioration based on cumulative number of retests) The degradation sign determination unit determines that the cumulative number of retransmissions reaches a predetermined degradation sign determination threshold number as a degradation sign of the transmission system and issues a report.

[0016] (Determining whether a response signal has been received) If the time between transmitting an arbitrary signal to the detector and receiving a response signal exceeds a predetermined time, the test instruction unit determines that the response signal was not received and retransmits the arbitrary signal. [Effects of the Invention]

[0017] (Basic effect) The present invention relates to a monitoring system that monitors abnormalities by connecting a receiving panel and a detector via a signal line, and the receiving panel is provided with a test instruction section that transmits a test instruction signal to the detector via the signal line to cause it to perform a predetermined test, receives a test response signal indicating the test result, and if the test response signal is not received, transmits the test instruction signal again to perform a retest (retry), and a deterioration sign judgment section that accumulates the number of retests of the detector by the test instruction section for each signal line, and judges that there is a deterioration sign of the transmission system including the signal line based on the number of retests, specifically when the accumulated number meets a predetermined deterioration sign judgment condition.Therefore, when a test such as a sensitivity test or a dirt test of the detector that is performed once a day is performed, if the deterioration of the transmission system including the signal line has progressed and the signal quality has decreased, the test response signal transmitted from the detector will be received and the deterioration sign judgment section will be Since there is a tendency for the number of retests to be performed without checking the quality of the system to increase, the cumulative number of retests for each signal line indicates the degree of deterioration of the transmission system, and when the cumulative number of retests meets the specified conditions for judging signs of deterioration, signs of deterioration of the transmission system, such as signal lines and signal transmission circuits, can be judged. For example, in a tunnel disaster prevention system, even before a transmission failure occurs, deterioration of the transmission system (decline in transmission quality) can prevent situations from occurring such as a disaster prevention receiving panel not properly receiving a fire signal from a fire detector, resulting in a missed fire alarm, or a signal that is not a fire signal being recognized as a fire signal, resulting in a false fire alarm. This allows managers to know that the deterioration of the transmission system is approaching its limit in the near future and that there is a high possibility of a deterioration failure occurring, and to take appropriate measures such as quickly formulating a signal line replacement plan and replacing the signal line.

[0018] (Effect of judging signs of deterioration based on the cumulative number of retests) Furthermore, the deterioration sign judgment unit judges that there is a deterioration sign of the transmission system when the cumulative number of retests reaches a predetermined deterioration sign judgment threshold number and issues an alert. Therefore, when the cumulative number of retests required for each transmission system including the signal line reaches a predetermined upper limit, it judges that there is a deterioration sign and issues an alert, thereby enabling appropriate measures to be taken.

[0019] (Effect of determining signs of deterioration based on the cumulative number of retests) Furthermore, the deterioration sign judgment unit calculates the retest occurrence rate for each specified period from the cumulative number of retests, and when the retest occurrence rate reaches a specified deterioration sign judgment threshold, it judges it to be a deterioration sign of the transmission system and issues an alert.As deterioration of the transmission system including the signal lines progresses, the cumulative number of retests tends to increase more strongly, so it calculates the retest occurrence rate for each specified period (for example, in the case of testing once a day, the cumulative number of retests for a specified period, e.g., 30 days, divided by 30 days), and when the retest occurrence rate reaches a specified upper limit, it judges it to be a deterioration sign and issues an alert, making it possible to take appropriate action. [Brief explanation of the drawings]

[0020] [Figure 1] An explanatory diagram showing the overview of the tunnel disaster prevention system [Figure 2] An explanatory diagram showing the detection area of a fire detector [Figure 3] Block diagram showing the functional configuration of the disaster prevention receiving panel DETAILED DESCRIPTION OF THE INVENTION

[0021] [Monitoring system] As an embodiment of the monitoring system of the present invention, a tunnel disaster prevention system that monitors fires inside a tunnel will be described as an example. That is, the monitored space is the inside of a tunnel, the abnormality to be monitored is a fire, the detector is a fire detector, and the receiving panel is a disaster prevention receiving panel (fire signal receiving device).

[0022] [Tunnel disaster prevention system] [Basic concept of the embodiment] Fig. 1 is an explanatory diagram showing an overview of a tunnel disaster prevention system. The basic concept of the tunnel disaster prevention system in this embodiment is as follows: As shown in Fig. 1, a disaster prevention receiving panel 10 monitors fires by connecting fire detectors 12 to signal lines (signal cables) 14a and 14b laid inside the tunnel, and the disaster prevention receiving panel 10 periodically transmits a test command signal to the fire detectors 12, for example, once a day, to cause them to perform predetermined tests such as sensitivity tests and contamination tests, and receives a test response signal indicating the test results. If the test response signal is not received, the disaster prevention receiving panel 10 transmits a test command signal again to perform a retest (retry). For example, the accumulated number of retests associated with the tests of the fire detectors 12 is calculated for each of the signal lines 14a and 14b, and when the accumulated number of retests reaches, for example, a predetermined deterioration sign judgment threshold number set as a predetermined deterioration sign judgment condition, the system judges that a deterioration sign has occurred and issues a warning.

[0023] As insulation deterioration progresses in the wiring of the signal lines 14a and 14b, the signal quality of the transmission system including the signal lines 14a and 14b becomes unstable, and when a fire detector sensitivity test or a dirt test, which is performed, for example, once a day in response to an instruction from the disaster prevention receiving panel, is performed, the test response signal transmitted from the fire detector is not received, and the number of retests tends to increase. In other words, the cumulative number of retests indicates the degree of deterioration of the transmission system, and by observing the progress of deterioration of the transmission system including the signal lines 14a and 14b and the transmission (signal transmitting / receiving) circuitry from the cumulative number of retests and determining and reporting signs of deterioration, it is possible to appropriately deal with the situation by planning the replacement of the signal lines before an incident such as an inability to receive a fire signal (missed fire alarm) occurs due to deterioration of the transmission system. Here, the deterioration sign of the transmission system means a phenomenon that predicts a deterioration failure that may occur in the future in the transmission system including the signal lines 14a, 14b, transmission circuits, etc., and can also be called a sign of a deterioration failure, a precursor to a deterioration failure, or a sign of a deterioration failure. In this embodiment, the cumulative number of retests for each signal system associated with the test of the fire detector 12 is regarded as a phenomenon that predicts a deterioration failure in each transmission system, and the deterioration sign is judged based on this. This will be explained in detail below.

[0024] [Outline of the tunnel disaster prevention system] As shown in Figure 1, an inbound tunnel 1a and an outbound tunnel 1b have been constructed as tunnels for expressways. Inside the inbound tunnel 1a and the outbound tunnel 1b, fire detectors 12 are installed along the longitudinal walls of the tunnels at intervals of, for example, 25 or 50 meters. The fire detectors 12 are connected to a power signal line and signal lines 14a and 14b drawn from a disaster prevention receiving panel 10, and are assigned unique addresses.

[0025] Figure 2 is an explanatory diagram showing the detection area of a fire detector. As shown in Figure 2, fire detector 12 is equipped with two sets of fire detection units, a right eye and a left eye, and has detection areas 15 in both the upward and downward longitudinal directions of the tunnel, which is the monitored space, and is continuously arranged along the longitudinal direction of the tunnel so that the detection areas 15 of adjacent fire detectors 12 overlap in a mutually complementary manner, for example, with right eye 13R and left eye 13L, and fires are detected by observing infrared rays from flames accompanying a fire that has occurred within detection area 15.

[0026] In addition, emergency facilities such as manual reporting devices and emergency telephones for reporting fires are installed in the up-track tunnel 1a and the down-track tunnel 1b, as well as fire hydrant devices for extinguishing fires and preventing the spread of fires, and water sprayers that spray fire-fighting water from water spray heads to protect the tunnel body and ducts from fires, but these are not shown in the illustration.

[0027] From the disaster prevention receiving panel 10 installed in a control room or the like, signal lines 14a and 14b, which include power lines and signal lines, are drawn out as signal systems for the up-line tunnel 1a and the down-line tunnel 1b, respectively, and fire detectors 12 are connected by these lines, and a unique address is set for each line of the fire detectors 12. In the following explanation, signal lines 14a and 14b may be referred to as signal line 14 when there is no need to distinguish between them.

[0028] In addition, the disaster prevention receiving panel 10 is provided with a fire pump equipment 16, a duct cooling pump equipment 18, an IG substation equipment 20, ventilation equipment 22, an alarm display board equipment 24, a radio rebroadcasting equipment 26, a television monitoring equipment 28, and lighting equipment 30, and the fire detector 12 and the disaster prevention receiving panel 10 communicate via a signal line 14 using so-called R-type (Record-type) transmission.

[0029] Here, the IG slave station equipment 20 is a communication equipment that connects the disaster prevention receiving panel 10 to the remote monitoring and control equipment 32, which is a higher-level equipment provided externally, via a network.

[0030] The ventilation equipment 22 is a facility that generates ventilation airflow in the longitudinal direction of the tunnel by operating jet fans installed on the ceiling side inside the tunnel.

[0031] The warning display board equipment 24 is equipment that displays on an electronic display board to notify users of abnormalities inside the tunnel, such as no-entry warnings due to fires. The radio rebroadcast equipment 26 is equipment that allows drivers and others inside the tunnel to receive information from the road administrator. The television monitoring equipment 28 is equipment that is used to confirm the size and location of a fire, activate water spray equipment, and grasp the situation inside the tunnel when providing evacuation guidance. The lighting equipment 30 is equipment that drives and manages the lighting equipment inside the tunnel.

[0032] [Fire detector] (structure) The fire detector 12 has two sets of light-transmitting windows on the left and right sides of its housing, and a fire detection unit is built in corresponding to each light-transmitting window. The fire detection unit has a sensor unit that receives infrared rays from a flame. In addition, two sets of light-transmitting windows for test light sources that house external test light sources used to test the dirtiness of the light-transmitting windows are provided near the light-transmitting windows in positions that allow the sensor unit of each fire detection unit to be seen through. In addition, two sets of internal test light sources that are used to test the fire sensitivity of the fire detection unit are built in near each sensor unit inside the fire detector 12.

[0033] (Fire detection) The fire detector 12 of this embodiment monitors fires by, for example, performing three-wavelength flame observation using a fire detection unit. The fire detection unit selectively transmits (passes) infrared light in the 4.5 μm band, which is the CO2 resonance radiation band specific to flames, from the infrared energy incident on the sensor unit through a translucent window using an optical wavelength bandpass filter, receives the infrared light using a light receiving sensor, converts it photoelectrically, and then performs predetermined processing such as amplification to generate a flame light receiving signal E1 corresponding to the amount of received light energy.

[0034] In addition, the fire detection unit selectively transmits (passes) infrared energy in the first non-flame wavelength band, for example, the 5.0 μm band, from the infrared energy that enters the sensor unit through the translucent window using an optical wavelength bandpass filter, receives the infrared energy using a light receiving sensor, converts it photoelectrically, and then performs predetermined processing such as amplification to generate a first non-flame light receiving signal E2 corresponding to the amount of received light energy.

[0035] Furthermore, the fire detection unit selectively transmits (passes) infrared energy in a second non-flame wavelength band, for example, the 2.3 μm band, from the infrared energy incident on the sensor unit through the translucent window using an optical wavelength bandpass filter, receives the infrared energy using a light receiving sensor, converts it photoelectrically, and then performs predetermined processing such as amplification to generate a second non-flame light receiving signal E3 corresponding to the amount of received light energy.

[0036] (Fire judgment) The fire detector 12 judges whether a fire exists, for example, in the following three stages: First, if the relative ratio (E1 / E2) between the flame light receiving signal E1 and the first non-flame light receiving signal E2 exceeds a predetermined threshold, it determines that the first stage fire judgment condition is met, and judges that there is a fire (fire candidate), and then performs the second stage fire judgment.

[0037] In the second stage of fire detection, when the relative ratio (E1 / E3) of the flame light reception signal E1 to the second non-flame light reception signal E3 exceeds a predetermined threshold, the second stage of fire detection conditions are met and a fire is detected.

[0038] The third stage of fire detection involves performing a fast Fourier transform (FFT) on the flame light reception signal E1, analyzing the results, and calculating the relative ratio between the relative intensity of the low-frequency component below 4 Hz and the relative intensity of the high-frequency component between 4 Hz and 8 Hz. If this relativization is equal to or exceeds a predetermined threshold, the third stage of fire detection conditions are met and a fire is detected.

[0039] Furthermore, if the first to third stage fire judgment conditions are met consecutively a predetermined number of times, it is judged that a fire has occurred (fire detection) as the predetermined fire judgment accumulation conditions have been met, and in this case the fire detector 12 controls the transmission unit, which is composed of a transmission circuit or the like, to send a fire signal to the disaster prevention receiving panel 10 via the signal line 14.

[0040] (Stain test) When the fire detector 12 receives a self-addressed contamination test command signal from the disaster prevention receiving panel 10, it drives the external test light sources to emit light, sequentially driving the external test light sources to emit light, and performs a contamination test to evaluate the degree of contamination of the light-transmitting window and detect contamination problems (abnormalities in which infrared transmission performance is reduced due to contamination) by, for example, comparing the level of the flame reception signal E1 at this time with the level of the flame reception signal E1 obtained in a similar manner in a factory-fresh state, and then transmits a test response signal indicating the test results to the disaster prevention receiving panel 10. The same can be done for the first non-flame reception signal E2 and the second non-flame reception signal E3, but the contamination test may be represented by, for example, only the flame reception signal E1.

[0041] (Sensitivity test) When the fire detector 12 receives a test command signal for a self-addressed sensitivity test from the disaster prevention receiving panel 10, it drives its internal test light source to emit light and, for example, compares the level of the flame reception signal E1 at this time with the level of the flame reception signal E1 obtained in a similar manner before shipping from the factory, thereby performing a sensitivity test to evaluate the sensitivity of the right-eye fire detection unit 60R and detect sensitivity failures (abnormalities outside the appropriate range, such as reduced sensitivity due to sensor failure, etc.), and transmits a test response signal indicating the test results to the disaster prevention receiving panel 10. The same can be done for the first non-flame reception signal E2 and the second non-flame reception signal E3.

[0042] The soiling test and the sensitivity test may be performed based on a common test instruction signal, and the results of both tests may be returned as a common test response signal.

[0043] [Disaster prevention receiving panel] (Outline of the disaster prevention receiving panel) Figure 3 is a block diagram showing an outline of the functional configuration of the disaster prevention receiving panel together with the fire detector. As shown in Figure 3, the disaster prevention receiving panel 10 is equipped with a panel control unit 34. The panel control unit 34 uses a computer circuit equipped with a CPU, memory, various input / output ports, etc., and is provided with the functions of a fire monitoring control unit 44, a test instruction unit 46, and a deterioration sign determination unit 48, which are realized by executing a program.

[0044] Transmission units 36a and 36b are provided for the panel control unit 34, and multiple fire detectors 12 installed in the up-line tunnel 1a and the down-line tunnel 1b are connected to signal lines 14a and 14b drawn from the transmission units 36a and 36b, respectively.

[0045] The panel control unit 34 is also provided with an alarm unit 38 equipped with a speaker, alarm indicator lights, etc., a display unit 40 equipped with an LCD display, a printer, etc., an operation unit 41 equipped with various switches, etc., and a modem 42 connecting the IG slave station equipment 20, and further with an IO unit 43 connected to the fire pump equipment 16, cooling pump equipment 18, ventilation equipment 22, alarm display board equipment 24, radio rebroadcasting equipment 26, television monitoring equipment 28, and lighting equipment 30 shown in Figure 1.

[0046] (Fire Surveillance Control Unit) The fire monitoring control unit 44 instructs the transmission units 36a and 36b to repeatedly send call signals including polling commands that sequentially specify the addresses of the fire detectors 12, and when the fire detectors 12 receive a call signal that matches their own address, they return a response signal such as a fire signal.

[0047] In addition, when the fire monitoring control unit 44 determines that there is a fire based on receiving a fire signal from the fire detector 12, it outputs a fire alarm from the alarm unit 38 and performs predetermined fire processing such as controlling the linkage of other equipment via the IO unit 43, for example, instructing the alarm display board equipment 24 to display a no-entry alarm.

[0048] (Test Instruction Department) The test instruction unit 46 transmits test instruction signals sequentially specifying the addresses of the fire detectors 12 when the system is started up and at a predetermined period during operation, for example, once a day, causes the fire detectors 12 to perform contamination tests and sensitivity tests, receives test response signals indicating the results of each test, and based on this, controls the alarm unit 38 to sound an alarm, the display unit 40 to display an alarm, and the display unit 40 to print an alarm indicating a contamination fault or sensitivity fault, specifying the address of the fire detector 12.

[0049] Furthermore, if the time between sending the test instruction signal and receiving the test response signal exceeds a predetermined time, the test instruction unit 46 determines that the test response signal was not received and performs a retest (retry) by sending the test instruction signal again.

[0050] In addition, the test instruction unit 46 determines that a test error (retry error) has occurred when the number of retests (number of retries) reaches a predetermined threshold number (maximum number of retests), and controls the alarm unit 38 to sound an alarm, the display unit 40 to display a fault alarm, and the display unit 40 to print an alarm indicating the test error.

[0051] (Deterioration sign determination unit) The deterioration sign determination unit 48 determines the deterioration sign for each transmission system including the signal line 14. Here, the transmission system refers to the transmission system that is the target of the deterioration sign determination, consisting of the signal lines 14a and 14b, the transmission units 36a and 36b of the disaster prevention receiving panel 10, and the transmission unit of the fire detector 12. Of these, for the transmission units 36a and 36b of the disaster prevention receiving panel 10 and the transmission unit of the fire detector 12, any input circuit unit such as a surge absorption circuit unit or a noise removal circuit unit that is attached to the transmission circuit and provided on the connection side of the signal line 14 is the target of the deterioration sign determination.

[0052] The deterioration sign judgment unit 48 accumulates the number of retests (excluding the number of retests that resulted in test errors (retry errors)) for each transmission system including the signal line 14, to determine the cumulative number of retests N, and when the cumulative number of retests N satisfies a predetermined deterioration sign judgment condition, for example, when the cumulative number of retests N reaches a predetermined deterioration sign judgment threshold number, it judges that there is a deterioration sign for the transmission system, and controls the alarm unit 38 to sound an alarm, the display unit 40 to display an alert, and the display unit 40 to print an alert.

[0053] When management personnel become aware of signs of deterioration in the transmission system through such notifications, they can take appropriate measures, such as scheduling testing work such as insulation degradation tests on signal lines, and based on the results, creating a signal line replacement plan and proceeding with renewal work.

[0054] As another embodiment of the deterioration sign judgment by the deterioration sign judgment unit 48, the retest occurrence rate may be calculated for each predetermined period from the cumulative number of retests, for example, for each predetermined number of tests when tests are conducted periodically, and when the retest occurrence rate meets a predetermined deterioration sign judgment threshold, it may be judged to be a deterioration sign of the transmission system and an alert may be issued.

[0055] For example, since the test instructing unit 46 instructs the fire detector 12 to be tested once a day, the deterioration sign determining unit 48 determines the retest occurrence rate for each predetermined period by, for example, dividing the cumulative number of retests in a 30-day predetermined period by the 30-day predetermined period (30 regular tests), and when this retest occurrence rate reaches a predetermined deterioration sign determination threshold, it determines that there is a deterioration sign for the transmission system, and performs control to notify by sounding an alarm from the alarm unit 38, displaying a message on the display unit 40, and printing. Furthermore, it is also possible to determine a retest increase rate from the change in the retest occurrence rate, and determine the deterioration sign based on this as well.

[0056] [Modifications of the present invention] (Test Instructions) In the above embodiment, the disaster prevention receiving panel instructs the fire detector to perform a dirt test and a sensitivity test, and the cumulative number of retests is calculated for each transmission system to determine signs of deterioration in the transmission system. However, this is not limited to this, and a signal is sent from the disaster prevention receiving panel, the fire detector responds to this, and if there is no response, the disaster prevention receiving panel 10 resends the signal to request a response, and the cumulative number of retransmissions is calculated for each transmission system in a similar manner to determine signs of deterioration in the transmission system.

[0057] (Fire detector) Furthermore, although the above embodiment takes a three-wavelength fire detector as an example, other methods may be used. For example, a two-wavelength flame detector may be used that detects infrared energy in the 4.5 μm band, which is the resonant radiation band of CO2, and in a wavelength band on the shorter wavelength side of that, for example, around 5.0 μm, and determines the presence or absence of a flame based on the relative ratio of the received light signals in these two wavelength bands.

[0058] (Monitoring system) The above embodiment takes as an example an R-type tunnel disaster prevention system that monitors for fires, which are abnormalities in a tunnel, as a monitoring system, but a P-type (Proprietary-type) system may also be used.

[0059] The present invention can also be applied to monitoring systems other than tunnel disaster prevention systems. For example, the present invention can be applied to appropriate monitoring systems, such as automatic fire alarm systems that monitor fires in buildings and disaster prevention systems that monitor fires in plants, etc. Furthermore, the abnormal events monitored are not limited to fires; various disaster events can also be monitored, and the present invention can also be applied to a monitoring system for crime prevention purposes, such as a crime prevention detector and a crime prevention receiving panel that have human body and intrusion detection functions.

[0060] (others) The present invention also includes appropriate modifications that do not impair the objects and advantages thereof, and is not limited to the numerical values shown in the above embodiments. [Explanation of symbols]

[0061] 1a: Up line tunnel 1b: Down line tunnel 10: Disaster prevention receiving panel 12: Fire detector 14a, 14b: Signal line 16: Fire pump equipment 18: Cooling pump equipment 20:IG slave station equipment 22: Ventilation equipment 24: Alarm display board equipment 26: Radio rebroadcasting equipment 28: TV monitoring equipment 30: Lighting equipment 32: Remote monitoring and control equipment 34: Panel control unit 36a, 36b: Transmission section 44: Fire monitoring control unit 46: Test Instructions 48: Deterioration sign judgment unit

Claims

1. A monitoring system that monitors abnormalities by connecting a receiving panel and a detector with a signal line, The receiving board, via the signal line, a test instruction unit that transmits an arbitrary signal to the detector to request a response, and if no response signal is received, retransmits the arbitrary signal to request a response again; a degradation sign determination unit that determines, for each of the signal lines, a degradation sign of a transmission system including the signal line based on the number of retransmissions; Equipped with The degradation sign judgment unit calculates the retransmission occurrence rate for each predetermined period from the cumulative number of retransmissions, and when the retransmission occurrence rate reaches a predetermined degradation sign judgment threshold, judges it to be a degradation sign of the transmission system and issues an alert.

2. A monitoring system that monitors abnormalities by connecting a receiving panel and a detector with a signal line, The receiving board, via the signal line, a test instruction unit that transmits an arbitrary signal to the detector to request a response, and if no response signal is received, retransmits the arbitrary signal to request a response again; a degradation sign determination unit that accumulates the number of retransmissions for each of the signal lines, and when the accumulated number of retransmissions corresponding to any of the signal lines satisfies a predetermined degradation sign determination condition, determines that the accumulated number of retransmissions corresponding to any of the signal lines satisfies a predetermined degradation sign determination condition, as a degradation sign of the transmission system including the signal line that satisfies the degradation sign determination condition; Equipped with The degradation sign judgment unit calculates the retransmission occurrence rate for each predetermined period from the cumulative number of retransmissions, and when the retransmission occurrence rate reaches a predetermined degradation sign judgment threshold, judges it to be a degradation sign of the transmission system and issues an alert.

3. 3. The monitoring system according to claim 1, The monitoring system is characterized in that the degradation sign determination unit determines that the cumulative number of retransmissions reaches a predetermined degradation sign determination threshold number, and reports the result.

4. 3. The monitoring system according to claim 1, A monitoring system characterized in that if the time between sending the arbitrary signal to the detector and receiving the response signal exceeds a predetermined time, the test instruction unit determines that the response signal was not received and retransmits the arbitrary signal.

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