Surveillance system and detector

Abstract

To enable proper identification of predictive failure of detectors due to age-related deterioration without being affected by fluctuations in light-receiving signal levels caused by environmental factors that may occur over time during testing of the detectors.SOLUTION: A disaster prevention system includes: a failure prediction determination unit 46 that determines a light-receiving signal obtained from light received by a sensor unit of a fire detector 12 during a test in which a test light source of the fire detector 12 is driven to be a predictive failure when predetermined failure prediction determination conditions are satisfied; and a failure prediction determination condition changing unit 47 that changes the predetermined failure prediction determination conditions based on the test result information of the light-receiving signal obtained by the test. As the predetermined failure prediction determination conditions, a failure prediction range is set between a normal range and a failure range, and the failure prediction determination condition changing unit 47 changes the failure prediction range by changing the normal range without changing the failure range.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a monitoring system such as a disaster prevention system that monitors for abnormalities using a detector connected to a signal line drawn from a disaster prevention receiving panel, and to a detector for the monitoring system. [Background technology]

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

[0003] In this type of tunnel disaster prevention system, fire detectors are installed in tunnels on expressways and other roads to monitor for fires in order to protect people and vehicles from fire accidents that may occur within the tunnel. The fire detectors are connected to signal lines drawn from a disaster prevention receiving panel to monitor for fires.

[0004] The fire detectors have detection areas on both the left and right sides and are arranged consecutively along the length of the tunnel, for example at intervals of 25 m or 50 m, so that the detection areas of adjacent fire detectors overlap in a mutually 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 have been in operation for a long time and have deteriorated, even if they appear to be operating normally without any sensitivity problems detected in sensitivity tests or dirt problems detected in dirt 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 a case, until it is confirmed that this 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 traffic through 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 progress of deterioration of the fire detector, it is possible to take action 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 in order to prevent false fire alerts. 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 the like. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] JP 2002-246962 A [Patent Document 2] JP 2016-128796 A [Patent Document 3] JP 2018-169893 A [Patent Document 4] Japanese Patent Application Publication No. 06-282774 [Patent Document 5] JP 2018-147373 A [Patent Document 6] JP 2017-034489 A [Patent Document 7] JP 2017-049799 A Summary of the Invention [Problem to be solved by the invention]

[0010] Incidentally, some of the conventional tunnel disaster prevention systems described above judge the degree of deterioration based on the light receiving signal level during fire detector testing. In this case, however, the light receiving signal level during testing fluctuates gradually due to influences such as seasonal environmental temperature, and for example, the light receiving signal level during testing may differ between winter and summer, when the environmental temperatures are significantly different, due to influences such as the temperature characteristics of each part involved in the test operation.

[0011] For this reason, it is necessary to grasp the signs of fire detector failures that take into account seasonal environmental factors. A sign of failure is a concept that indicates a state in which the possibility of a failure state, such as generation of noise signals or insufficient sensitivity, is increasing due to deterioration of the detection sensor (light receiving sensor in the embodiment described below) or circuit components of the detector, in other words, a sign that a failure may occur in the near future.

[0012] The present invention aims to provide a monitoring system and a detector for that monitoring system that can appropriately detect signs of failure due to deterioration of the detector over time without being affected by fluctuations in the level of the received light signal due to changes in environmental factors over time when testing the detector. [Means for solving the problem]

[0013] (Surveillance System) The present invention is a monitoring system that monitors abnormalities by connecting a detector to a receiving panel, a failure sign determination unit that determines that a light reception signal obtained from light received by a sensor unit of the detector during a test in which a test light source of the detector is driven satisfies a predetermined failure sign determination condition, as a failure sign; a failure sign determination condition changing unit that changes a predetermined failure sign determination condition based on test result information of the light receiving signal obtained by the test; Equipped with As a predetermined failure sign judgment condition, a failure sign range of the level of the light receiving signal that is judged to be a failure sign is set between a normal range of the level of the light receiving signal that is judged to be a normal detector and a failure range of the level of the light receiving signal that is judged to be a detector failure for a level of the light receiving signal that is lower than the normal range, The failure sign determination condition changing unit is characterized in that, when changing the failure sign range as a predetermined failure sign determination condition, it changes the failure sign range by changing the normal range without changing the failure range.

[0014] (How to change the normal range and failure warning range) The failure sign judgment change unit acquires a reference value for the level of the received light signal based on the level of the received light signal within the normal range or failure sign range obtained by testing during a specified period as test result information, and sets a new normal range and failure sign range based on the reference value.

[0015] (Detector) According to another aspect of the present invention, there is provided a detector for testing its own normality by a test in which a test light source is driven, comprising: a failure sign determination unit that determines that a light reception signal obtained from light received by the sensor unit during testing is a failure sign when the light reception signal satisfies a predetermined failure sign determination condition; a failure sign determination condition changing unit that changes a predetermined failure sign determination condition based on test result information of the light receiving signal obtained by the test; Equipped with As a predetermined failure sign judgment condition, a failure sign range of the level of the light receiving signal that is judged to be a failure sign is set between a normal range of the level of the light receiving signal that is judged to be a normal detector and a failure range of the level of the light receiving signal that is judged to be a detector failure for a level of the light receiving signal that is lower than the normal range, The failure sign determination condition changing unit is characterized in that, when changing the failure sign range as a predetermined failure sign determination condition, it changes the failure sign range by changing the normal range without changing the failure range.

[0016] The detector invention also has the "feature of the method for changing the normal range and the failure prediction range" of the monitoring system invention. Effect of the Invention

[0017] (Basic effect) The present invention relates to a monitoring system in which a plurality of detectors are connected to a receiving panel to monitor for abnormalities. Each of the detectors judges that a malfunction has occurred when a predetermined malfunction sign judgment condition is satisfied based on a light receiving signal during a test in which a test light source is driven, and the receiving panel acquires test result information from each of the detectors, and determines which detector should have its malfunction sign judgment condition changed based on the acquired plurality of pieces of test result information. For example, in a tunnel disaster prevention system in which a fire detector is installed, if the environmental temperature inside the tunnel varies with the season, the malfunction sign judgment condition is changed based on the test result information based on the light receiving signal from the test, and as a result, for example Even if the light receiving signal level during testing fluctuates due to seasonal environmental factors, etc., the conditions for determining signs of failure are changed to track these fluctuations, making it possible to accurately determine signs of failure from the light receiving signal level during testing throughout the year.By focusing on inspections of fire detectors that have been determined to be showing signs of failure (or are in a state of such) due to aging or other factors, operations managers and others can take appropriate measures for fire detectors that have been determined to be showing signs of failure and prevent false fire alarms.For example, in the case of a tunnel disaster prevention system, this makes it possible to reduce secondary effects such as the closure of tunnel traffic due to fire treatment accompanied by a tunnel no-entry alarm, more than before.

[0018] In addition, the receiving panel determines which detectors should have their failure prediction conditions changed based on the test result information from each of the detectors, thereby reducing the processing load on the detectors.

[0019] In addition, the receiving panel processes test result information from multiple detectors comprehensively, dividing it into sections, signal systems, etc., making it possible to accurately determine signs of failure while avoiding the influence of environmental factors that arise in specific sections, signal systems, etc.

[0020] (Effect of generating test result information by averaging) Each detector generates test result information by averaging the received light signals over a specified period of time, excluding those that are at a specified specific level, so that it is possible to generate test result information in which the influence of received light signals affected by transient factors is suppressed, making it possible to change the failure prediction judgment conditions, which are changed based on the test result information, to more accurate conditions. [Brief description of the drawings]

[0021] [Figure 1] An explanatory diagram showing the overview of the tunnel disaster prevention system [Diagram 2] An explanatory diagram showing the detection area of ​​a fire detector [Diagram 3] An explanatory diagram showing the appearance of a fire detector [Figure 4] Block diagram showing the outline of the functional configuration of a fire detector [Diagram 5] Block diagram showing the outline of the functional configuration of the disaster prevention receiving panel [Figure 6] A diagram showing the setting of failure sign judgment conditions and the failure sign judgment operation based on the light reception level during testing. [Figure 7] FIG. 13 is an explanatory diagram showing a change operation of the failure sign judgment condition by a failure sign judgment condition change unit; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] [Surveillance system] As an embodiment of the monitoring system of the present invention, a tunnel disaster prevention system that monitors fires in 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).

[0023] In addition, the detector in the present invention has the function of testing its own normality based on the light receiving signal received by the on-board light receiving element of the detector that generates test light by driving the on-board test light source, and the fire detector in the following embodiments also has the same function.

[0024] [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 that a fire detector 12 installed in a tunnel is connected to a disaster prevention receiving panel 10 via a signal line 14 to monitor fires in a detection area 15 in a monitored space, and the disaster prevention receiving panel 10 performs a predetermined fire treatment based on a fire signal from the fire detector 12, and the tunnel disaster prevention system determines that a failure sign of the fire detector 12 is present when a predetermined failure sign determination condition is met based on a light receiving signal when a test light source of the fire detector 12 is driven, generates test result information based on the level of the light receiving signal from the test of the fire detector 12, and changes the failure sign determination condition based on the test result information.

[0025] This allows the conditions for determining signs of failure to be changed based on test result information based on the level of the light receiving signal from the test. As a result, even if the light receiving signal level during the test fluctuates due to seasonal environmental factors, the conditions for determining signs of failure are optimized to follow this fluctuation, making it possible to properly identify signs of fire detector failure throughout the year. Operation managers, etc. can take appropriate measures such as inspection, repair, or replacement of fire detectors that are determined to have signs of failure, and can prevent the occurrence of non-fire alarms due to, for example, the gradual deterioration of fire detectors over time.

[0026] Furthermore, the failure sign judgment conditions are changed based on the trend of change in the level of the light receiving signal obtained from the test result information of the fire detector 12. For example, if there is an increasing trend, the failure sign judgment conditions are changed to match this increasing trend, and if there is a decreasing trend, the failure sign judgment conditions are changed to match this decreasing trend, making it possible to properly judge failure signs without being affected by fluctuating environmental factors. This will be explained in detail below.

[0027] [Outline of tunnel disaster prevention system] As shown in Fig. 1, inside the inbound tunnel 1a and outbound tunnel 1b of the expressway, fire detectors 12 are installed at intervals of, for example, 25 or 50 meters along the walls in the longitudinal direction of the tunnel, and are connected to signal lines 14 drawn from a disaster prevention receiving panel 10 installed in a control room or the like, and each fire detector 12 is assigned a unique address. The signal lines 14 may include a power line.

[0028] Fig. 2 is an explanatory diagram showing the detection area of ​​a fire detector. As shown in Fig. 2, the fire detector 12 has two sets of fire detection parts, a right eye and a left eye, and has a detection area 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 of adjacent fire detectors 12 overlap mutually complementarily, for example, with the right eye 13R and the left eye 13L, and detects a fire by observing infrared rays from a flame caused by a fire that has occurred within the detection area 15.

[0029] In addition, the disaster prevention receiving panel 10 is provided with a fire pump equipment 16, duct cooling pump equipment 18, IG substation equipment 20, ventilation equipment 22, alarm display board equipment 24, radio rebroadcast equipment 26, television monitoring equipment 28 and lighting equipment 30, etc., and the fire detector 12 and the disaster prevention receiving panel 10 communicate via signal line 14 using the so-called R-type (Record-type) transmission method.

[0030] Here, the IG slave station equipment 20 is a communication equipment that connects the disaster prevention receiving panel 10 and the remote monitoring and control equipment 32, which is a higher-level equipment installed outside, via a network. The ventilation equipment 22 is equipment that generates ventilation air in the longitudinal direction of the tunnel by operating a jet fan installed on the ceiling side inside the tunnel. The alarm display board equipment 24 is equipment that displays information such as a no-entry alarm due to a fire on an electric display board to inform users. The radio rebroadcast equipment 26 is equipment that allows drivers and others in the tunnel to receive information from the road administrator. The TV monitoring equipment 28 is equipment that grasps the situation inside the tunnel when checking the scale and location of a fire, activating the water spray equipment, and guiding evacuation. The lighting equipment 30 is equipment that drives and manages the lighting equipment inside the tunnel.

[0031] [Fire detector] (Appearance of a fire detector) Fig. 3 is an explanatory diagram showing the appearance of the fire detector, and Fig. 4 is a block diagram showing an outline of the functional configuration of the fire detector. As shown in Fig. 3, the fire detector 12 has two pairs of light-transmitting windows 50R, 50L, separated on the left and right, in a sensor storage section 49 provided in the upper part of a housing 48, and a sensor section is built in corresponding to each of the light-transmitting windows 50R, 50L. In addition, two pairs of light-transmitting windows 52R, 52L for test light sources, which store external test light sources used for soiling tests of the light-transmitting windows 50R, 50L, are provided in positions near the light-transmitting windows 50R, 50L where the sensor sections can be seen through.

[0032] In the following description, the light-transmitting window 50R may be referred to as the right-eye light-transmitting window 50R, and the light-transmitting window 50L may be referred to as the left-eye light-transmitting window 50L.

[0033] (Outline of fire detector configuration) 4, the fire detector 12 is provided with a detector control unit 54, a transmission unit 56, a power supply unit 58, two sets of left and right fire detection units 60R, 60L, a test light emission drive unit 76, internal test light sources 78R, 80R, 82R and internal test light sources 78L, 80L, 82L used in sensitivity tests, and external test light sources 84R, 84L used in dirt tests. In the following description, the fire detection unit 60R may be referred to as the right eye fire detection unit 60R, and the fire detection unit 60L may be referred to as the left eye fire detection unit 60L.

[0034] The detector control unit 54 has a function realized by, for example, executing a program, and as hardware, a computer circuit equipped with a CPU, memory, various input / output ports, etc. is used.

[0035] The transmission unit 56 is connected to the disaster prevention receiving panel 10 shown in FIG. 1 by the transmission line S and the transmission common line SC of the signal line 14, and various signals are transmitted and received by R-type transmission.

[0036] The power supply unit 58 receives power from the disaster prevention receiving panel 10 shown in Figure 1 via the power line B and power common line BC included in the signal line 14, and a predetermined power supply voltage is supplied to, for example, the detector control unit 54, the transmission unit 56, the two sets of fire detection units 60R, 60L (left and right), and the test light emission driving unit 76.

[0037] The test light emission driver 76 is connected to internal test light sources 78R, 80R, 82R, 78L, 80L, and 82L used for testing, and also to external test light sources 84R and 84L used for dirt testing, each of which is provided with a krypton lamp as a light emitting element.

[0038] (Fire detection section) The fire detection units 60R and 60L each include a sensor unit 64, 68, and 72 and an amplification processing unit 66, 70, and 74. For example, in the right fire detection unit 60R, a right light-transmitting window 50R provided in the sensor storage unit 46 is disposed in front of the sensor unit 64, 68, and 72, and infrared energy from an external detection area is incident on the sensor unit 64, 68, and 72 through the right light-transmitting window 50R.

[0039] The right eye fire detection unit 60R monitors fires, for example, by three-wavelength flame observation. The sensor unit 64 selectively transmits (passes) infrared rays in the 4.5 μm band, which is the resonance radiation band of CO2 specific to flames, from the infrared energy incident through the right eye transparent window 50R using an optical wavelength bandpass filter, receives the infrared rays using a light receiving sensor, converts them photoelectrically, and then performs predetermined processing such as amplification using an amplification processing unit 66 to output the signal as a flame receiving signal E1R corresponding to the amount of received light energy to the detector control unit 54.

[0040] The sensor unit 68 selectively transmits (passes) infrared energy in the first non-flame wavelength band, for example the 5.0 μm band, from the infrared energy incident through the right eye transparent window 50R using an optical wavelength bandpass filter, receives the infrared energy using a light receiving sensor and performs photoelectric conversion, and then performs predetermined processing such as amplification using the amplification processing unit 70 to output the first non-flame light receiving signal E2R corresponding to the amount of received light energy to the detector control unit 54.

[0041] The sensor unit 72 selectively transmits (passes) infrared energy in the second non-flame wavelength band, for example the 2.3 μm band, from the infrared energy incident through the right eye transparent window 50R using an optical wavelength bandpass filter, receives the infrared energy using a light receiving sensor and performs photoelectric conversion, and then performs predetermined processing such as amplification using the amplification processing unit 74 and outputs the second non-flame light receiving signal E3R corresponding to the amount of received light energy to the detector control unit 54.

[0042] The amplification processing units 66, 70, 74 are provided with a preamplifier, a frequency filter that selectively passes a predetermined frequency band including the flame flicker frequency, a main amplifier, and the like.

[0043] The detector control unit 54 judges (detects) a fire by a known method based on the flame receiving signal E1R, the first non-flame receiving signal E2R, and the second non-flame receiving signal E3R.

[0044] In addition, when the detector control unit 54 receives a self-addressed test instruction signal from the disaster prevention receiving panel 10, it drives the external test light sources 84R, 84L to emit light in sequence, and performs a dirt test to evaluate the degree of dirt on the translucent window 50R and detect dirt problems (abnormalities in which infrared transmission performance is reduced due to dirt) by, for example, comparing the level of the flame receiving signal E1R at this time with the level of the flame receiving signal E1R obtained in a similar manner in the uncontaminated state at the time of shipment from the factory; and also performs a sensitivity test to evaluate the sensitivity of the right eye fire detection unit 60R and detect sensitivity problems (abnormalities in which sensitivity is not within the appropriate range, such as reduced sensitivity due to sensor failure, etc.) by driving the internal test light sources 78R, 80R, 82R to emit light in sequence, and performs a sensitivity test to evaluate the sensitivity of the right eye fire detection unit 60R and detect sensitivity problems (abnormalities in which sensitivity is not within the appropriate range, such as reduced sensitivity due to sensor failure, etc.) by, for example, comparing the level of the flame receiving signal E1R at this time with the level of the flame receiving signal E1R obtained in a similar manner in the factory.

[0045] The internal test light sources 78R, 80R, 82R and the internal test light sources 78L, 80L, 82L may each be shared by one light source. The same applies to the left eye fire detection unit 60L. The same can be done for the first non-flame receiving signals E2R, E2L and the second non-flame receiving signals E3R, E3L.

[0046] [Disaster prevention receiving panel] (Outline of the disaster prevention receiving panel) Fig. 5 is a block diagram showing an outline of the functional configuration of the disaster prevention receiving panel. As shown in Fig. 5, the disaster prevention receiving panel 10 includes a panel control unit 34, which is composed of a computer circuit having a CPU, memory, various input / output ports, etc., and is provided with the functions of a fire monitoring control unit 45, a failure sign determination unit 46, and a failure sign determination condition change unit 47, which are realized by executing a program, for example.

[0047] Transmission units 36a, 36b are provided for the panel control unit 34, and a plurality of fire detectors 12 installed in the up line tunnel 1a and the down line tunnel 1b are connected to signal lines 14 drawn from the transmission units 36a, 36b.

[0048] In addition, the panel control unit 34 is 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 child station equipment 20, and further provided with an IO unit 43 to which the fire pump equipment 16, cooling pump equipment 18, ventilation equipment 22, alarm display board equipment 24, radio rebroadcast equipment 26, television monitoring equipment 28 and lighting equipment 30 shown in Figure 1 are connected.

[0049] If the fire monitoring and control unit 45 determines that there is a fire based on receiving a fire signal from the fire detector 12, it performs predetermined fire processing including outputting (notifying) a fire alarm by the alarm unit 38, linking control of other equipment via the IO unit 43, for example displaying a no entry alarm by the alarm display board equipment 24, and transmitting a fire report signal to the remote monitoring and control equipment 32.

[0050] (Failure prediction unit) The failure sign judgment unit 46 sets specified failure sign judgment conditions and performs control to judge that a failure sign of the fire detector 12 is present if the specified failure sign judgment conditions are satisfied based on the light receiving signal (or the corresponding light receiving signal information) when the test light source of the fire detector 12 is driven.

[0051] For example, the failure sign judgment unit 46 judges that a failure sign is present when the level of the received light signal from a sensitivity test to test the internal normality of the detector, which is performed periodically, for example once a day, is neither normal nor a failure based on a predetermined reference value, and performs control to judge that a failure sign is present as a failure sign of the fire detector when the number of times that the failure sign has been judged reaches a predetermined failure sign judgment threshold number.

[0052] FIG. 6 is an explanatory diagram showing the setting of failure sign judgment conditions and the operation of judging a failure sign based on the light reception signal level during a sensitivity test.

[0053] For simplicity of explanation, the following will be described as a case in which the flame reception signal E1R during a sensitivity test is used to determine whether there is a fault in the right eye fire detection unit 60R based on the level of this reception signal, and the conditions for determining whether there is a fault can be changed; however, the first non-flame reception signals E2R, E2L and the second non-flame reception signals E3R, E3L can also be used to determine whether there is a fault, and a fault detection judgment can be made for each of these signals, i.e., for each signal system (i.e., signal system including amplification processing units 66, 70, 74) of the sensor units (sensor units 64, 68, 72) of the fire detection units 60R, 60L, and the conditions for determining whether there is a fault can be changed.

[0054] 6(A), the failure sign determination unit 46 initially registers the peak level of the light receiving signal (flame light receiving signal E1R) detected in a sensitivity test of the fire detector 12 in a factory-shipped state as a reference value (reference level) 96 as a failure sign determination condition, sets a predetermined normal range 98 including the reference value 96 and a predetermined failure threshold 102 below the normal range 98, sets a failure range 104 below the failure threshold 102, and sets a failure sign range 100 between the normal range 98 and the failure range 104. Note that the failure threshold 102 may be a fixed value and the failure range 104 may be a fixed range, or the failure range 104 may be changed according to the reference value 96.

[0055] Here, the normal range 98 of the received light signal is a range between, for example, an upper limit value 98a and a lower limit value 98b with the reference value 96 at the center, and is, for example, ±10 percent of the reference value 96. Also, the failure threshold 102 is, for example, a value of about 50 percent of the reference value 96.

[0056] For example, a range from (upper limit 98a) to {(reference value 96)+(50 percent of reference value 96)} may be added as the failure symptom range 100. For example, a range of {(reference value 96)+(50 percent of reference value)} or more may be added as the failure range 104.

[0057] Based on the setting of the failure sign judgment conditions based on the normal range 98, failure range 104, and failure sign range 100 based on such a reference value 96, the peak level of the light receiving signal (flame light receiving signal E1R) detected by a test conducted, for example, once a day is plotted as shown by the black circle in Figure 6 (A). If the peak level during the test is not within the normal range 98 or the failure range 104, i.e., is within the failure sign range 100, the failure sign judgment unit 46 will judge it to be a failure sign.

[0058] 6(B), the failure sign judgment unit 46 counts the number of judgments N of failure signs and compares it with a predetermined failure sign judgment threshold number Nth, and when the number of judgments N reaches the failure sign judgment threshold number Nth, it judges that the failure sign judgment condition is satisfied and judges that a failure sign has occurred. That is, the failure sign judgment unit 46 judges a failure sign based on the light receiving signal during testing and based on the peak level of the light receiving signal being neither in the normal range 98 nor in the failure range 104, combining these with the number of judgments N.

[0059] Here, the number of judgments may be counted, for example, for a predetermined period (for example, a predetermined number of tests performed periodically), and when this period has elapsed, the count may be cleared and restarted, or any other appropriate counting method may be adopted.

[0060] (Failure sign judgment condition change part) The failure sign determination condition changing unit 47 generates test result information based on the peak level of the light receiving signal in the test, and performs control to change the failure sign determination conditions based on the test result information. In this case, the failure sign determination condition changing unit 47 changes the failure sign determination conditions, for example, the reference value 96 shown in Fig. 6(A), based on the tendency of the peak level of the light receiving signal obtained from the test result information, and changes the normal range 98, the failure range 104, and the failure sign range 100 in accordance with the change in the reference value 96.

[0061] 7 is an explanatory diagram showing the operation of changing the failure sign judgment conditions by the failure sign judgment condition changing unit, and shows an example in which a test is performed once a day and the timing of changing the failure sign judgment conditions is set in 10-day units. Note that the failure threshold 102 is fixed.

[0062] If the timing to change the failure sign judgment conditions is reached on day D1, which is 10 days after day D0 (T1=10 days), then 10 peak levels of the light-receiving signal during testing, indicated by black dots, are obtained during period T1. Here, during period T1, a normal range 98-1 and a failure sign range 100-1 are set based on the reference value 96-1 at that time, and seven of those times are within the normal range 98-1, two are within the failure sign range 100-1, and the remaining one is at point a, which is beyond the normal range 98-1.

[0063] Here, the case will be described where the peak level at point a is excluded from the calculation of the initial value as a peculiar level due to transient disturbance light, external electrical noise or vibration, induced lightning, etc. Also, as shown at point b in period T2, a peak level below the failure threshold 102 is excluded from the calculation of the reference value 96-2 as a peculiar level. Of course, these peculiar levels may also be included in the calculation, and it may be possible to select whether to include or exclude a peculiar level depending on the frequency of occurrence of the peculiar level, for example.

[0064] Based on the peak levels of the test-time light-receiving signal held during such period T1, the failure sign judgment condition change unit 47 excludes the peak level at point a from the calculation of the initial value, and obtains a new reference value 96-2 by averaging the nine peak levels in the normal range 98-1 and the failure sign range 100-1. In this case, the peak levels are the light-receiving signal information, and the average processing result is the test result information.

[0065] Next, the failure symptom judgment condition change unit 47 determines a new reference value 96-2 from the peak level of the received light signal during period T1, sets this as the reference value 96-2 for the next period T2, and sets a normal range 98-2 based on the new reference value 96-2, and as a result, a failure symptom range 100-2 is set.

[0066] As a result, the reference value 96-2, normal range 98-2, and failure sign range 100-2 are changed to shift to lower levels in response to the decreasing trend of the peak level of the test-time light receiving signal during period T1, thereby changing the failure sign judgment conditions. Similarly, if the peak level of the test-time light receiving signal tends to increase, the reference value 96-2, normal range 98-2, and failure sign range 100-2 are changed to shift to higher levels in response to this.

[0067] Similarly, each time the timing for changing the failure sign judgment conditions is reached, the failure sign judgment condition changing unit 47 obtains new reference values ​​96-3, 96-4, ... and changes the normal ranges 98-3, 98-4, ... and the failure sign ranges 100-3, 100-4, ..., thereby changing the failure sign judgment conditions in accordance with the tendency of the peak level of the light received signal during the test.

[0068] For this reason, even if the level of the light receiving signal during testing fluctuates due to seasonal factors, the conditions for judging signs of failure are changed to track this fluctuation, making it possible to appropriately judge signs of failure from the level of the light receiving signal during testing throughout the year.If a sign of failure is judged under such appropriate conditions, it is clear that the reliability of the fire detector 12 has decreased.Therefore, the operations manager can take appropriate action by, for example, focusing on inspections of fire detectors that have been judged to be signs of failure, and it becomes possible to prevent, more reliably than before, incidents such as the closure of passage through the tunnel due to fire treatment such as non-fire alarms and accompanying tunnel entry no-entry alarms.

[0069] Here, the timing of changing the failure sign judgment conditions by the failure sign judgment condition changing unit 47 is not limited to a fixed period of time, and may be performed every time a specified number of tests are counted, including cases where tests are not conducted periodically, or may be performed when a failure sign is detected in a specific fire detector, or may be performed by the administrator at any timing via the operation unit 41, and any appropriate method may be used.

[0070] In addition, the failure sign judgment condition changing unit 47 changes the failure sign judgment conditions based on the peak level of the light receiving signal during testing as the test result information, but it may also be possible to use statistically processed values ​​such as the average value of the peak level of the light receiving signal during testing as test result information and change the failure sign judgment conditions based on this.

[0071] Furthermore, if the light receiving signal level during testing is stored on an annual basis, and the failure sign judgment conditions are changed, for example, on a monthly basis, the light receiving level during testing in the same month of the previous year may be read out and the failure sign judgment conditions may be changed based on this. If the failure sign judgment conditions changed on a monthly basis are stored, and, for example, when the failure sign judgment conditions are changed on a monthly basis, the failure sign judgment conditions in the same month of the previous year may be read out and changed. Furthermore, instead of or in addition to changing the failure sign range, the failure sign judgment threshold number Nth may be changed as a failure sign judgment condition.

[0072] [System layout of failure sign determination unit and failure sign determination condition change unit] In the above embodiment, the functions of the failure sign determination unit 46 and the failure sign determination condition change unit 47 are located in the disaster prevention receiving panel 10, but this is not limited to this and they may be located at any position in the system.

[0073] For example, the functions of the failure sign determination unit 46 and the failure sign determination condition change unit 47 may be disposed in the fire detector 12. In this case, the fire detector 12 changes the failure sign determination conditions based on its own test result information upon receiving an instruction to change the failure sign determination conditions from the disaster prevention receiving panel 10 or at a timing managed by the fire detector 12.

[0074] In addition to issuing instructions from the disaster prevention receiving panel 10 to the fire detectors 12 to change the failure sign judgment conditions at specified intervals, the disaster prevention receiving panel 10 may acquire test result information from multiple fire detectors 12 and process it comprehensively, for example, dividing the test result information into tunnel sections, signal systems, etc., and comprehensively process the test result information, and issue instructions to change the failure sign judgment conditions for sections and signal systems where the level of the received light signal fluctuates greatly during testing.

[0075] In addition, as another embodiment, the failure sign judgment unit 46 may be placed in the fire detector 12 and the failure sign judgment condition change unit 47 may be placed in the disaster prevention receiving panel 10, and so on. This is optional and may be distributed within the system.

[0076] [Modifications of the present invention] (Fire detector) The above embodiment takes a three-wavelength fire detector as an example, but other methods may be used. For example, it may be a two-wavelength flame detector that detects infrared energy in the 4.5 μm band, which is the resonant radiation band of CO2, and a wavelength band on the shorter wavelength side, 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.

[0077] (Surveillance System) In the above embodiment, an R-type tunnel disaster prevention system that monitors for fires, which are abnormalities within a tunnel, is taken as an example of the monitoring system, but a P-type (Proprietary-type) system may also be used.

[0078] The present invention can also be applied to monitoring systems other than the tunnel disaster prevention system. For example, the present invention can be applied to appropriate monitoring systems such as an automatic fire alarm system that monitors for fires in buildings and a disaster prevention system that monitors for fires in plants, etc. Furthermore, the abnormal events to be monitored are not limited to fires, and may be various disaster events, etc., or may be a monitoring system for crime prevention purposes that is composed of a crime prevention detector and a crime prevention receiving panel that have functions of detecting human bodies and intrusions.

[0079] (others) Furthermore, the present invention includes appropriate modifications that do not impair the objects and advantages of the present invention, and is not limited to the numerical values ​​shown in the above embodiment. [Explanation of symbols]

[0080] 1a: Up line tunnel 1b: Down line tunnel 10: Disaster prevention receiving panel 12: Fire detector 14: 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 surveillance equipment 30: Lighting equipment 32: Remote monitoring and control equipment 34: Panel control unit 36a, 36b: Transmission section 45: Fire monitoring and control unit 46: Failure prediction unit 47: Failure sign judgment condition change section 50R,50L: Translucent window 52R, 52L: Light-transmitting window for test light source 54: Detector control unit 56: Transmission section 58: Power supply section 60R, 60L: Fire detection unit 64, 68, 72: Sensor section 66, 70, 74: Amplification processing section 76: Test light emission driver 78R, 78L, 80R, 80L, 82R, 82L: Internal test light source 84R, 84L: External test light source

Claims

1. A monitoring system that monitors for abnormalities by connecting a detector to a receiving panel, a failure sign determination unit that determines that a light reception signal obtained from light received by a sensor unit of the detector during a test in which a test light source of the detector is driven satisfies a predetermined failure sign determination condition, and a failure sign determination condition changing unit that changes the predetermined failure sign determination condition based on test result information of the light receiving signal obtained by the test; Equipped with As the predetermined failure sign judgment condition, a failure sign range of the level of the light receiving signal that is judged to be a failure sign is set between a normal range of the level of the light receiving signal that is judged to be the normal state of the detector and a failure range of the level of the light receiving signal that is judged to be a failure of the detector, the failure range being targeted for a level of the light receiving signal that is lower than the normal range, A monitoring system characterized in that, when changing the failure sign judgment condition range as the specified failure sign judgment condition, the failure sign range is changed by changing the normal range without changing the failure range.

2. 2. The monitoring system of claim 1, The failure sign judgment change unit obtains a reference value of the level of the received light signal based on the level of the received light signal within the normal range or the failure sign range obtained by the test during a specified period as the test result information, and sets a new normal range and failure sign range based on the reference value.

3. A detector that tests its own normality by driving a test light source, a failure sign determination unit that determines that a light reception signal obtained from light received by the sensor unit during the test satisfies a predetermined failure sign determination condition as a failure sign; a failure sign determination condition changing unit that changes the predetermined failure sign determination condition based on test result information of the light receiving signal obtained by the test; Equipped with As the predetermined failure sign judgment condition, a failure sign range of the level of the light receiving signal that is judged to be a failure sign is set between a normal range of the level of the light receiving signal that is judged to be the normal state of the detector and a failure range of the level of the light receiving signal that is judged to be a failure of the detector, the failure range being targeted for a level of the light receiving signal that is lower than the normal range, The detector is characterized in that, when changing the failure sign judgment condition range as the specified failure sign judgment condition, the failure sign range is changed by changing the normal range without changing the failure range.

4. 4. The detector of claim 3, the failure sign judgment change unit obtains a reference value of the level of the received light signal based on the level of the received light signal within the normal range or the failure sign range obtained by the test during a specified period as the test result information, and sets a new normal range and failure sign range based on the reference value.

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