JP2020187401A - Monitoring system and detector - Google Patents

Abstract

To provide a monitoring system that can properly grasp a failure sign due to aged deterioration of a detector at the time of testing of the detector without being affected by fluctuation of a light receiving signal level caused by changes of environmental factors over time.SOLUTION: A disaster prevention reception board 10 monitors a fire in a detection area with a fire detector 12 connected, and performs a fire treatment based on a fire signal from the fire detector. The disaster prevention reception board determines a failure sign of the fire detector based on a light receiving signal when a test light source of the fire detector is driven, when prescribed failure sign determination conditions are satisfied, and changes the failure sign determination conditions on the basis of the change tendency of a light receiving signal level at the time of testing, which is acquired from information about the test result of the fire detector.SELECTED DRAWING: Figure 5

Description

The present invention relates to a monitoring system and a detector such as a disaster prevention system that monitors a fire by a fire detector connected to a signal line drawn from a disaster prevention receiving panel.

Conventionally, for example, there is a tunnel disaster prevention system as a monitoring system for monitoring a fire in a tunnel.

In such a tunnel disaster prevention system, a fire detector that monitors the fire is installed in a tunnel such as a motorway to protect people and vehicles from a fire accident that occurs in the tunnel, and is pulled out from the disaster prevention receiver. It is connected to a signal line to monitor fires.

The fire detector has detection areas in both the left and right directions, and the detection areas with the adjacent fire detectors overlap each other along the longitudinal direction of the tunnel, for example, at intervals of 25 m or 50 m. They are arranged continuously at intervals.

In addition, the fire detector monitors the radiation from the fire flame generated in the tunnel through the translucent window, for example, infrared rays, and in order to check the sensitivity of the light receiving element in order to maintain the flame monitoring function. Sensitivity test and dirt test to monitor dirt on transparent windows are conducted.

However, in such a conventional fire detector, when the operation period becomes long and the fire detector deteriorates, the sensitivity failure by the sensitivity test and the dirt failure by the dirt test are not detected normally. Even in a state where it seems to be in operation, there is a possibility that the fire detector outputs a fire detection signal and a non-fire alarm is issued from the disaster prevention receiver. In such a case, it is a non-fire alarm. Until it is confirmed that it is, it is necessary to issue an entry prohibition warning by using an alarm display board equipment etc. to prohibit the vehicle from passing through the tunnel, and the person in charge must go to the site to check it, and it takes time to resume the tunnel passage. It takes time, and the impact of causing traffic congestion is not small.

For this reason, a tunnel disaster prevention system has been proposed in which the degree of deterioration is determined and notified based on environmental stress such as temperature, humidity, shock vibration, and electrical noise of the fire detector on the disaster prevention receiver. By grasping the progress of deterioration of the detector, it is possible to take measures such as replacing the fire detector with a spare fire detector before a non-fire report is issued.

Further, in the conventional tunnel disaster prevention system, when the disaster prevention receiver receives a fire signal from the fire detector, the fire detector is temporarily restored after a predetermined time in order to prevent a non-fire alarm, and then again for a predetermined time. When a fire signal is received within the time, it is judged as a fire and an entry prohibition warning is issued by the alarm display board equipment.

JP-A-2002-246962 JP-A-2016-1287796 JP-A-2018-169893

By the way, in some conventional tunnel disaster prevention systems as described above, the degree of deterioration is determined based on the received signal level at the time of testing the fire detector. In this case, the received signal level in the test is, for example, seasonal. The received signal level at the time of the test may differ due to the influence of the temperature characteristics of each part related to the test operation in winter and summer when the environmental temperature is significantly different, for example. ..

For this reason, it is necessary to grasp the signs of failure of the fire detector in consideration of the environmental factors of the time. A failure sign is an increased possibility that a failure state such as noise signal generation or insufficient sensitivity due to deterioration of the detector detection sensor (light receiving sensor in the case of the embodiment described later) or circuit parts is increased. It is a concept that indicates a state of being present, that is, a sign that a failure may occur in the near future.

According to the present invention, even if there is a change in the received signal level due to a change over time due to environmental factors or the like during a detector test, the sign of failure due to aged deterioration of the detector can be appropriately grasped without being affected by the change. The purpose is to provide a possible monitoring system.

(Monitoring system)
The present invention is a monitoring system in which a detector is connected to a receiver to monitor an abnormality.
A failure sign determination unit that determines a failure sign of the detector when a predetermined failure sign determination condition is satisfied based on the received signal when the test light source of the detector is driven.
A failure sign judgment condition change unit that generates test result information based on the received signal from the test and changes the failure sign judgment condition based on the test result information.
It is characterized by being equipped with.

(Change of failure sign judgment conditions according to the change tendency of the received signal level during the test)
The failure sign determination condition changing unit changes the failure sign determination condition based on the change tendency of the level of the received light signal obtained from the test result information.

(Change of reference value to change failure sign judgment condition)
The failure sign judgment unit determines that the fire detector is a failure sign based on the fact that the level of the received signal in the test is neither normal nor failure based on the predetermined reference value.
The failure sign determination condition change unit changes the reference value based on the change tendency of the level of the received light signal obtained from the test result information.

(Details of changing the reference value to change the failure sign judgment conditions)
The failure sign determination unit determines that the detector is a failure sign based on the fact that the level of the received signal in the test is not within the predetermined normal range including the reference value and is not within the predetermined failure range below the normal range.
The failure sign determination condition change unit changes the reference value and the normal range based on the change tendency of the level of the received light signal obtained from the test result information.

(Failure sign judgment unit and failure sign judgment condition change unit are placed on the receiving panel)
The failure sign determination unit and the failure sign determination condition change unit are arranged on the disaster prevention receiver, and the detector transmits the test result information based on the received signal when the test light source is driven to the receiver.

(Test result information is generated on the receiving panel)
The failure sign judgment unit and the failure sign judgment condition change unit are arranged on the receiving panel, and the detector transmits the light receiving signal information based on the light receiving signal when the test light source is driven to the receiving panel, and the receiving panel uses the light receiving signal information. Generate test result information based on.

(Failure sign judgment unit and failure sign judgment condition change unit are placed in the detector)
The failure sign judgment unit and the failure sign judgment condition change unit are located on the detector.
The receiving panel instructs the detector to change the failure sign judgment condition at a predetermined timing.

(Basic effect)
The present invention is a monitoring system that monitors a fire by connecting a detector to a receiver, and detects when a predetermined failure sign determination condition is satisfied based on a received signal when the test light source of the detector is driven. Since it is equipped with a failure sign judgment unit that determines the failure sign of the device and a failure sign judgment condition change unit that generates test result information based on the received signal from the test and changes the failure sign judgment condition based on the test result information. For example, in the case of a tunnel disaster prevention system equipped with a fire detector, when the environmental temperature in the tunnel fluctuates depending on the season, the failure sign judgment conditions are changed based on the test result information based on the received signal from the test, and as a result, for example, seasonally. Even if the received signal level at the time of the test fluctuates due to environmental factors, the failure sign judgment conditions are changed according to this change, and it becomes possible to accurately judge the failure sign from the received signal level in the test throughout the year. The operation manager, etc. will focus on inspecting the fire detectors that are judged to be (state) of failure due to deterioration over time, and take appropriate measures for the fire detectors that are judged to be failure signs. Non-fire alarms can be prevented, for example, in the case of a tunnel disaster prevention system, this makes it possible to suppress secondary effects such as stopping tunnel traffic due to fire treatment accompanied by a tunnel entry prohibition warning.

(Effect of changing failure sign judgment conditions according to the tendency of light reception level during test)
In addition, since the failure sign judgment condition change unit changes the failure sign judgment condition based on the change tendency of the received signal level obtained from the test result information, the received signal level during the test changes with the seasonal change and the like. For example, if there is an increasing trend, the failure sign condition is changed according to this increasing trend, and if the received signal level during the test is decreasing, the failure sign condition is changed according to this decreasing trend, and the environment fluctuates. It makes it possible to appropriately judge the failure sign without being affected by the factors.

Here, as the received light signal level, for example, the peak level, average level, integration level, etc. of the received light signal at the time of the test when the test light source is driven for a predetermined time can be adopted in one test, but the present invention is not limited to this. The drive of the test light source in one test may be an intermittent drive or a one-pulse drive. Further, as the change tendency of the received light signal during the test, for example, the tendency of the integration, average, moving average, etc. of each received signal level in a plurality of tests conducted in a predetermined period can be set to increase, stagnation, decrease, etc. , Not limited to this.

(Effect of changing the reference value to change the failure sign judgment condition)
In addition, the failure sign judgment unit determines that the fire detector is a failure sign based on the fact that the level of the received signal received by the test is neither normal nor failure based on a predetermined reference value, and the failure sign judgment condition change unit tests. Since the reference value is changed based on the change tendency of the level of the received signal obtained from the result information, it means a state that predicts a failure that may occur in the future, and it means a failure sign of the detector, a sign of failure, and a failure. It is possible to accurately grasp the signs of failure, which can be said to be a precursor to the above, without being affected by seasonal changes.

Specifically, for example, if a reference value is set based on the received signal level at the time of testing at the time of shipment from the factory, for example, if the difference between the received signal level at the time of testing and the reference value in the test during operation satisfies a predetermined normal judgment condition. If it is normal and the difference from the reference value satisfies the predetermined failure judgment conditions, it is considered as a failure, but if the light receiving level at the time of the test is neither normal nor a failure, based on this (for example, during the predetermined number of test executions). When the light receiving level during the test is neither normal nor faulty meets the predetermined number of failure sign judgment thresholds (ratio), or when the light receiving level during the test is neither normal nor faulty continues a predetermined number of times, etc.) Set the failure sign judgment condition to judge that it is a failure sign of the detector and judge it as a failure sign.

By changing the above-mentioned reference value constituting the failure condition judgment condition based on the change tendency of the received light signal level during the test, the failure sign judgment condition is substantially changed based on the change tendency of the received light signal level during the test. Can be done. Therefore, it is possible to determine a failure sign that is not affected by seasonal changes.

(Effect of change details of reference value for changing failure sign judgment conditions)
In addition, the failure sign determination unit determines that the detector is a failure sign based on the fact that the level of the received signal in the test is not within the predetermined normal range including the reference value and is not within the predetermined failure range below the normal range. Since the failure sign judgment condition change unit changes the reference value and the normal range based on the change tendency of the received signal level obtained from the test result information, the reference value is based on the tendency of the received signal level during the test. By changing the above, the normal range based on the reference value and the failure sign range, which is the failure sign range, are also changed, and the failure sign judgment conditions for judging the failure sign are changed according to the tendency of the light receiving level during the test. be able to.

(Effect of arranging the failure sign judgment unit and the failure sign judgment condition change unit on the receiving panel)
Further, the failure sign determination unit and the failure sign determination condition change unit are arranged on the receiving panel, and the detector transmits the test result information based on the light receiving signal when the test light source is driven to the receiving panel. By acquiring the light receiving signal (light receiving signal level) at the time of the test from the test result information received from the detector, the receiving board can judge the failure sign of the detector and change the failure sign judgment condition on the receiving board. It is possible to reduce the processing load of the detector.

(Effect of generating test result information on the receiver)
In addition, the failure sign judgment unit and the failure sign judgment condition change unit are arranged on the receiving panel, and the detector transmits the light receiving signal information based on the light receiving signal when the test light source is driven to the receiving board, and the receiving board transmits the light receiving signal. Since the test result information is generated based on the information, the detector uses the light-receiving signal information at the time of the test, for example, the light-receiving signal itself (for example, the AD conversion sampling value of the light-receiving analog signal waveform) or the light-receiving signal level (peak) for each test. It is only necessary to transmit the level, etc.) to the receiving panel, and the processing load of the detector can be further reduced.

(Effect of arranging the failure sign judgment unit and the failure sign judgment condition change unit on the detector)
In addition, the failure sign judgment unit and the failure sign judgment condition change unit are arranged in the detector, and the receiving panel instructs the detector to change the failure sign judgment condition at a predetermined timing, so that the failure sign judgment and the failure sign can be determined. Both of the judgment conditions are changed on the detector side, and in this case, the processing load on the receiving panel can be reduced.

Explanatory diagram showing the outline of the tunnel disaster prevention system Explanatory drawing showing the detection area of the fire detector Explanatory drawing showing the appearance of the fire detector Block diagram showing the outline of the functional configuration of the fire detector Block diagram showing the outline of the functional configuration of the disaster prevention receiver Explanatory drawing showing the failure sign judgment operation based on the setting of the failure sign judgment condition and the light receiving level at the time of the test. Explanatory drawing showing the operation of changing the failure sign judgment condition by the failure sign judgment condition change unit.

[Monitoring system]
As an embodiment of the monitoring system of the present invention, a tunnel disaster prevention system for monitoring a fire in a tunnel will be described as an example. That is, a case will be described in which the monitoring target space is inside a tunnel, the abnormality as a monitoring target is a fire, the detector is a fire detector, and the receiver is a disaster prevention receiver (fire signal receiver).

The detector in the present invention has a function of testing the normality of the test light generated by driving the self-mounted test light source based on the light receiving signal received by the self-mounted light receiving element. , The fire detectors in the following embodiments also have the same function.

..
[Tunnel disaster prevention system]
[Basic concept of the embodiment]
FIG. 1 is an explanatory diagram showing an outline of a tunnel disaster prevention system. The basic concept of the tunnel disaster prevention system in the present embodiment is to connect a fire detector 12 installed in the tunnel to the disaster prevention receiving panel 10 via a signal line 14 to detect a fire in the detection area 15 in the monitored space. The disaster prevention receiver 10 monitors and performs predetermined fire processing based on the fire signal from the disaster detector 12, and the tunnel disaster prevention system is based on the received signal when the test light source of the fire detector 12 is driven. , When the predetermined failure sign judgment condition is satisfied, it is judged as a failure sign of the fire detector 12, test result information based on the level of the received signal by the test of the fire detector 12 is generated, and the failure is based on the test result information. It is to change the predictive judgment conditions.

As a result, the failure sign judgment condition is changed based on the test result information based on the received signal level in the test, and as a result, even if the received signal level at the time of the test fluctuates due to seasonal environmental factors, the fluctuation is followed. The conditions for determining the failure sign have been optimized, and it has become possible to appropriately grasp the failure sign of the fire detector throughout the year, and the operation manager, etc. inspects, repairs, and replaces the fire detector for which the failure sign has been determined. By taking appropriate measures such as, for example, it is possible to prevent the occurrence of non-fire alarms due to the gradual deterioration of the fire detector over time.

Further, the change of the failure sign determination condition is to change the failure sign determination condition based on the change tendency of the level of the received light signal obtained from the test result information of the fire detector 12, and if there is an increasing tendency, for example, The failure sign judgment conditions are changed according to this increasing trend, and if there is a decreasing trend, the failure sign judgment conditions are changed according to this decreasing trend, so it is appropriate without being affected by fluctuating environmental factors. It is possible to judge the sign of failure. This will be described in detail below.

[Overview of tunnel disaster prevention system]
As shown in FIG. 1, fire detectors 12 are installed inside the up line tunnel 1a and the down line tunnel 1b of the motorway along the wall surface in the longitudinal direction of the tunnel, for example, at intervals of 25 meters or 50 meters, and a control room is provided. It is connected to the signal line 14 drawn from the disaster prevention receiving panel 10 installed in the fire detector 12 and the like, and a unique address is set for the fire detector 12. The signal line 14 may include a power line.

FIG. 2 is an explanatory diagram showing a detection area of the fire detector. As shown in FIG. 2, the fire detector 12 includes two sets of fire detection units, a right eye and a left eye, so that the detection areas 15 can be detected in both the longitudinal ascending side and the descending side in the tunnel which is the monitoring target space. The detection area is continuously arranged so that the detection areas with the fire detectors 12 arranged adjacent to each other along the longitudinal direction of the tunnel overlap with each other, for example, the right eye 13R and the left eye 13L. The fire is detected by observing the infrared rays from the flame accompanying the fire that occurred in 15.

For the disaster prevention receiver 10, the fire extinguishing pump equipment 16, the cooling pump equipment 18 for ducts, the IG slave station equipment 20, the ventilation equipment 22, the alarm display board equipment 24, the radio rebroadcasting equipment 26, the television monitoring equipment 28, and the like. Lighting equipment 30 and the like are provided, and the fire detector 12 and the disaster prevention receiver 10 communicate with each other via the signal line 14 in a so-called R-type (Record-type) transmission method.

Here, the IG slave station equipment 20 is a communication equipment that connects the disaster prevention receiving panel 10 and the remote monitoring control equipment 32, which is a higher-level equipment provided outside, via a network. The ventilation equipment 22 is equipment that generates a ventilation flow in the longitudinal direction of the tunnel by operating a jet fan installed on the ceiling side in the tunnel. The alarm display board equipment 24 is equipment that displays information such as an entry prohibition warning due to a fire on an electric display board to notify the user. The radio rebroadcasting facility 26 is a facility for allowing a driver or the like to receive information from a road administrator in a tunnel. The TV monitoring facility 28 is a device for confirming the scale and position of a fire, operating a water spray facility, and grasping the situation inside a tunnel when guiding evacuation. The lighting equipment 30 is equipment that drives and manages the lighting equipment in the tunnel.

[Fire detector]
(Appearance of 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, in the fire detector 12, two sets of translucent windows 50R and 50L are provided on the left and right in the sensor storage portion 49 provided in the upper part of the housing 48, and the translucent windows are provided. A sensor unit is built in corresponding to each of the 50R and 50L. Further, two sets of translucent windows for test light sources 52R in which an external test light source used for a stain test of the translucent windows 50R and 50L are housed in a position near the translucent windows 50R and 50L where the sensor unit can be seen. , 52L is provided.

In the following description, the translucent window 50R may be referred to as a right-eye translucent window 50R, and the translucent window 50L may be referred to as a left-eye translucent window 50L.

(Outline configuration of fire detector)
As shown in FIG. 4, the fire detector 12 includes a detector control unit 54, a transmission unit 56, a power supply unit 58, two sets of left and right fire detection units 60R and 60L, a test light emission drive unit 76, and a sensitivity test. Internal test light sources 78R, 80R, 82R, internal test light sources 78L, 80L, 82L, and external test light sources 84R, 84L used for a stain test are provided. In the following description, the fire detection unit 60R may be referred to as a right eye fire detection unit 60R, and the fire detection unit 60L may be referred to as a left eye fire detection unit 60L.

The detector control unit 54 is, for example, a function realized by executing a program, and as hardware, a computer circuit having a CPU, a memory, various input / output ports, and the like is used.

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

The power supply unit 58 receives power from the disaster prevention receiving panel 10 shown in FIG. 1 by the power supply line B and the power supply common line BC included in the signal line 14, for example, the detector control unit 54, the transmission unit 56, and two sets of fires on the left and right. A predetermined power supply voltage is supplied to the detection units 60R and 60L and the test light emission drive unit 76.

Internal test light sources 78R, 80R, 82R, 78L, 80L, 82L used for the test are connected to the test light emitting drive unit 76, and external test light sources 84R, 84L used for the dirt test are connected to each of the light emitting elements. A krypton lamp is provided as a light source.

(Fire detection unit)
The fire detection units 60R and 60L include sensor units 64, 68 and 72 and amplification processing units 66, 70 and 74, respectively. Taking the right eye fire detection unit 60R as an example, the right eye translucent window 50R provided on the front surface of the sensor units 64, 68, 72 (is arranged in the sensor storage unit 46) is arranged, and the right eye translucent window is arranged. Infrared energy from the external detection area is incident on the sensor units 64, 68, 72 via the 50R.

The right eye fire detection unit 60R monitors a fire by, for example, a three-wavelength flame observation. The sensor unit 64 selectively transmits infrared rays in the 4.5 μm band, which is a resonance radiation band of CO ₂ peculiar to flames, from the infrared energy incident through the right eye translucent window 50R by an optical wavelength band path filter. After (passing), the infrared ray is received by the light receiving sensor and photoelectrically converted, and then a predetermined process such as amplification is performed by the amplification processing unit 66 to obtain a flame light receiving signal E1R corresponding to the amount of light receiving energy. Output to.

The sensor unit 68 selectively transmits infrared energy in the first non-flame wavelength band, for example, 5.0 μm band, from the infrared energy incident through the right eye translucent window 50R by an optical wavelength band path filter. After (passing), the light is received by the light receiving sensor, photoelectric conversion is performed, and then a predetermined process such as amplification is performed by the amplification processing unit 70, and the detector control unit is used as the first non-flame light receiving signal E2R corresponding to the amount of light receiving energy. Output to 54.

The sensor unit 72 selectively transmits infrared energy in the second non-flame wavelength band, for example, 2.3 μm band, from the infrared energy incident through the right eye translucent window 50R by an optical wavelength band path filter. After (passing), the light is received by the light receiving sensor and photoelectrically converted, and then a predetermined process such as amplification is performed by the amplification processing unit 74, and the detector control unit is used as the second non-flame light receiving signal E3R corresponding to the amount of light receiving energy. Output to 54.

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

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

Further, the detector control unit 54 drives the external test light sources 84R and 84L to emit light in order when receiving the test instruction signal of the self-address designation from the disaster prevention receiver 10, for example, the level of the flame light receiving signal E1R at this time. By comparing with the level of the flame light receiving signal E1R obtained in the same manner in the state of no stain at the time of shipment from the factory, the degree of contamination of the translucent window 50R is evaluated and the stain obstacle (infrared transmission performance deteriorates due to contamination). A stain test was performed to detect abnormalities), and the internal test light sources 78R, 80R, and 82R were driven to emit light in order, and the level of the flame light receiving signal E1R at this time was obtained in the same manner as at the time of shipment from the factory. By comparing with the level of the flame light receiving signal E1R, a sensitivity test is conducted to evaluate the sensitivity of the right eye fire detection unit 60R and detect a sensitivity failure (abnormality that is not within an appropriate range such as a decrease in sensitivity due to a sensor failure, etc.). Do.

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

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

Transmission units 36a and 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 the signal line 14 drawn from the transmission units 36a and 36b. Has been done.

Further, the panel control unit 34 is connected to an alarm unit 38 equipped with a speaker, an alarm indicator, etc., a display unit 40 equipped with a liquid crystal display, a printer, etc., an operation unit 41 equipped with various switches, and an IG slave station facility 20. A modem 42 is provided, and the fire extinguishing pump equipment 16, the cooling pump equipment 18, the ventilation equipment 22, the alarm display board equipment 24, the radio rebroadcasting equipment 26, the television monitoring equipment 28, and the lighting equipment 30 shown in FIG. 1 are connected. The IO unit 43 is provided.

When the fire monitoring control unit 45 determines that a fire has occurred based on the reception of the fire signal from the fire detector 12, the fire alarm output (notification) by the alarm unit 38 and interlocking control of other equipment via the IO unit 43, for example. Predetermined fire processing including display of an entry prohibition alarm by the alarm display board equipment 24 and transmission of a fire transfer signal to the remote monitoring and control equipment 32 is performed.

(Failure sign judgment unit)
The failure sign determination unit 46 sets a predetermined failure sign determination condition, and sets a predetermined failure sign determination condition based on the received signal (or the corresponding received signal information) when the test light source of the fire detector 12 is driven. When the condition is satisfied, the fire detector 12 is controlled to be judged as a failure sign.

For example, when the failure sign determination unit 46 is neither normal nor faulty based on a predetermined reference value by a sensitivity test for testing its own internal normality, which is regularly performed, for example, once a day. It is controlled to determine the failure sign, and when the number of determinations of the failure sign reaches a predetermined failure sign determination threshold number, the fire detector is determined to be a failure sign.

FIG. 6 is an explanatory diagram showing a failure sign determination operation based on the setting of the failure sign determination condition and the received signal level at the time of the sensitivity test.

In order to simplify the explanation, the following describes a case where the failure sign of the right eye fire detection unit 60R is determined based on the received signal level of the flame light receiving signal E1R at the time of the sensitivity test, and the failure sign determination condition is changed. However, similarly, the first non-flame receiving signals E2R and E2L and the second non-flame receiving signals E3R and E3L also determine the failure sign based on these, and each of these signals, that is, the sensors of the fire detection units 60R and 60L. The failure sign determination may be performed for each signal system (that is, the signal system including the amplification processing units 66, 70, 74) of the units (sensor units 64, 68, 72), and the failure sign determination conditions may be changed.

As shown in FIG. 6A, the failure sign determination unit 46 determines the failure sign determination condition of the light receiving signal (flame light receiving signal E1R) detected in the sensitivity test of the fire detector 12 at the time of shipment from the factory. The peak level is initially set and registered as the reference value (reference level) 96, the predetermined normal range 98 including the reference value 96 and the predetermined failure threshold 102 are set so as to be lower than the normal range 98, and the failure threshold is 102 or less. The failure range 104 is set, and the area between the normal range 98 and the failure range 104 is set to the failure sign range 100. The failure threshold value 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.

Here, the normal range 98 of the received signal is set to a range sandwiched between, for example, the normal upper limit value 98a and the normal lower limit value 98b around the reference value 96, and is, for example, ± 10% with respect to the reference value 96. Further, the failure threshold value 102 is set to, for example, a value of about 50% of the reference value 96.

As the failure sign range 100, for example, a range from (upper limit value 98a) to {(reference value 96) + (50% of reference value 96)} may be added. As for the failure range 104, for example, a range of {(reference value 96) + (50% of reference value)} or more may be added.

Based on the setting of the failure sign judgment condition based on the normal range 98, the failure range 104, and the failure sign range 100 based on the reference value 96, as shown by the black circle in FIG. 6 (A), for example, once a day. To plot and exemplify the peak level of the light receiving signal (flame light receiving signal E1R) detected by the test, the failure sign determination unit 46 shows that the peak level at the time of the test is neither in the normal range 98 nor in the failure range 104, that is, When it is within the failure sign range 100, it is determined to be a failure sign.

Subsequently, as shown in FIG. 6B, the failure sign determination unit 46 counts the failure sign determination number N and compares it with the predetermined failure sign determination threshold number Nth, and the determination number N is the failure sign. When the number of judgment thresholds Nth is reached, it is judged as a failure sign assuming that the failure sign judgment condition is satisfied. That is, the failure sign determination unit 46 is based on the received signal at the time of the test, and based on the fact that the peak level of the received signal is neither in the normal range 98 nor in the failure range, and the number of determinations N is added to these to predict the failure. I try to judge.

Here, the number of determinations may be counted, for example, for a predetermined period (for example, a predetermined number of tests to be performed periodically), and when this has elapsed, the count may be cleared and the count may be restarted. The method can be adopted.

(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 received signal received by the test, and controls to change the failure sign determination condition based on the test result information. In this case, the failure sign determination condition changing unit 47 changes the failure sign determination condition, for example, the reference value 96 shown in FIG. 6 (A), based on the tendency of the peak level of the received signal obtained from the test result information. With the change of the reference value 96, the normal range 98, the failure range 104, and the failure sign range 100 are changed.

FIG. 7 is an explanatory diagram showing the operation of changing the failure sign judgment condition by the failure sign judgment condition change unit. For example, when the test is performed once a day and the change timing of the failure sign judgment condition is set in units of 10 days. Is taken as an example. The failure threshold value 102 is fixed.

Now, assuming that the change timing of the failure sign judgment condition is reached on D1 day when the period T1 = 10 days has passed from D0 day, the peak level of the received light signal for 10 tests indicated by the black dot is obtained during the period T1. There is. Here, in the period T1, the normal range 98-1 and the failure sign range 100-1 are set based on the reference value 96-1 at that time, of which 7 times are in the normal range 98-1 but 2 times. Is in the failure sign range 100-1, and the remaining one is at point a, which exceeds the normal range 98-1.

Here, the case where the peak level at point a is excluded from the calculation target of the initial value as a peculiar level due to transient disturbance light, electrical external noise, vibration, induced lightning, or the like will be described. Further, as shown at point b in the period T2, the peak level below the failure threshold value 102 is also excluded from the calculation target of the reference value 96-2 as a singular level. Of course, these peculiar levels may also be calculated targets, and for example, it may be selected whether to be targeted or excluded from the target according to the frequency of appearance of the peculiar levels.

Based on the peak level of the received light signal during the test held in T1 during such a period, the failure sign determination condition changing unit 47 excludes the peak level at point a from the calculation target of the initial value, and has a normal range of 98-1 and a failure. A new reference value 96-2 is obtained by averaging the nine peak levels in the sign range 100-1. In this case, the peak level is the received signal information, and the average processing result is the test result information.

Subsequently, the failure sign determination condition changing unit 48 obtains a new reference value 96-2 from the received signal peak level in the period T1, sets this as the reference value 96-2 in the next period T2, and sets the new reference value. The normal range 98-2 is set based on 96-2, and as a result, the failure sign range 100-2 is set.

As a result, the reference value 96-2, the normal range 98-2, and the failure sign range 100-2 are changed so as to shift to the low level side according to the decreasing tendency of the peak level of the received signal during the test in the period T1. , The failure sign judgment conditions are changed. Similarly, if the peak level of the received signal during the test tends to increase, the reference value 96-2, the normal range 98-2, and the failure sign range 100-2 are changed to shift to the higher level side accordingly. Will be done.

Similarly, the failure sign determination condition changing unit 48 obtains new reference values 96-3, 96-4, ... Each time the failure sign determination condition change timing is reached, and the normal range 98-3, By changing 98-4, ... And the failure sign range 100-3, 100-4, ..., the failure sign determination condition is changed according to the tendency of the peak level of the received signal during the test.

Therefore, for example, even if the level of the received signal during the test fluctuates due to seasonal factors, the failure sign judgment conditions are changed in accordance with this change, and the failure sign is appropriately judged from the level of the received signal from the test throughout the year. When it is determined that the fire is a sign of failure under appropriate conditions, it is found that the reliability of the fire detector 12 is lowered. Therefore, the operation manager can, for example, perform a failure. Appropriate measures can be taken by focusing on the fire detectors that are judged to be signs, and the tunnel passage will be stopped due to fire treatment such as non-fire alarms and accompanying tunnel entry prohibition warnings. It will be possible to prevent this from happening more reliably than before.

Here, the timing of changing the failure sign determination condition by the failure sign determination condition changing unit 47 is not limited to a fixed period, and may be performed every time a predetermined number of tests is counted, including the case where the test is not periodic. , It may be performed when a failure sign of a specific fire detector is determined, or it may be performed by the administrator at an arbitrary timing via the operation unit 41, and an appropriate method can be used.

Further, the failure sign determination condition changing unit 47 changes the failure sign determination condition based on the peak level of the light receiving signal during the test as the test result information, but statistically such as the average value of the peak level of the light receiving level during the test. The processed information may be used as the test result information, and the failure sign determination condition may be changed based on the test result information.

In addition, when the light receiving signal level at the time of the test is stored on an annual basis, for example, when the failure sign judgment condition is changed on a monthly basis, the light receiving level at the time of the test in the same month of the previous year is read and the failure sign judgment condition is changed based on this. You may. Further, when the failure sign determination condition changed on a monthly basis is stored and the failure sign determination condition is changed on a monthly basis, for example, the failure sign determination condition in the same month of the previous year may be read and changed. Further, as a failure sign determination condition, the failure sign determination threshold number Nth may be changed instead of or in addition to changing the failure sign range.

[System layout of failure sign judgment unit and failure sign judgment 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 arranged in the disaster prevention receiver 10, but the present invention is not limited to this, and the functions may be arranged at any position on the system. good.

For example, the functions of the failure sign determination unit 46 and the failure sign determination condition change unit 47 may be arranged in the fire detector 12. In this case, the fire detector 12 changes the failure sign determination condition based on the self-owned test result information at the timing of receiving the failure sign determination condition change instruction from the disaster prevention receiver 10 or at the timing of its own management.

The disaster prevention receiver 10 acquires test result information from a plurality of fire detectors 12 and comprehensively gives an instruction to change the failure sign judgment condition from the disaster prevention receiver 10 to the fire detector 12 except when the instruction is given at predetermined intervals. For example, the test result information is comprehensively processed by dividing it into tunnel sections, signal systems, etc., and for example, instructions for changing failure sign judgment conditions are given to sections and signal systems where the level fluctuation of the received signal during the test is large. You may do it.

Further, as another form, the failure sign determination unit 46 may be arranged in the fire detector 12, and the failure sign determination condition change unit 47 may be arranged in the disaster prevention receiver 10 in a distributed manner in the system. Well, it's optional.

[Modification of the present invention]
(Fire detector)
Although the above embodiment takes a three-wavelength fire detector as an example, other methods may be used, for example, the 4.5 μm band which is the resonance radiation band of CO ₂ and the short wavelength side thereof, for example, 5. It may be a two-wavelength type flame detector that detects infrared energy in a wavelength band near 0 μm and determines the presence or absence of a flame by the relative ratio of each received signal in these two wavelength bands.

(Monitoring system)
In the above embodiment, as a monitoring system, an R-type tunnel disaster prevention system that monitors an abnormal fire in the tunnel is taken as an example, but a P-type (proprietary-type) may also be used.

The present invention can also be applied to monitoring systems other than tunnel disaster prevention systems. For example, it can be applied to an appropriate monitoring system such as an automatic fire alarm system for monitoring a fire in a building or a disaster prevention system for monitoring a fire in a plant or the like. Further, the abnormal event to be monitored may be one that monitors various disaster events, etc., not limited to fire. For example, it is composed of a crime prevention detector and a crime prevention receiver having a function of detecting a human body or intrusion. It may be a surveillance system for crime prevention purposes.

(Other)
Further, the present invention includes appropriate modifications that do not impair its purpose and advantages, and is not further limited by the numerical values shown in the above embodiments.

1a: Up line tunnel 1b: Down line tunnel 10: Disaster prevention receiver 12: Fire detector 14a, 14b: Signal line 16: Fire extinguishing 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 control equipment 34: Panel control units 36a, 36b: Transmission unit 45: Fire monitoring control unit 46: Failure sign determination unit 47: Failure sign Judgment condition changing unit 50R, 50L: Translucent window 52R, 52L: Translucent window for test light source 54: Detector control unit 56: Transmission unit 58: Power supply unit 60R, 60L: Fire detection unit 64, 68, 72: Sensor Units 66, 70, 74: Amplification processing unit 76: Test emission drive unit 78R, 78L, 80R, 80L, 82R, 82L: Internal test light source 84R, 84L: External test light source

Claims (7)

In a monitoring system that monitors abnormalities by connecting a detector to the receiving panel
Based on the received signal when the test light source of the detector is driven, the failure sign determination unit that determines the failure sign of the detector when a predetermined failure sign determination condition is satisfied, and the failure sign determination unit.
A failure sign judgment condition change unit that generates test result information based on the received light signal from the test and changes the failure sign judgment condition based on the test result information.
A monitoring system characterized by being equipped with.
In the monitoring system according to claim 1,
The failure sign determination condition changing unit is a monitoring system characterized in that the failure sign determination condition is changed based on a change tendency of the level of the received light signal obtained from the test result information.
In the monitoring system according to claim 1,
The failure sign determination unit determines that the detector is a failure sign based on the fact that the level of the received light signal in the test is neither normal nor failure based on a predetermined reference value.
The failure sign determination condition changing unit is a monitoring system characterized in that the reference value is changed based on the change tendency of the level of the received light signal obtained from the test result information.
In the monitoring system according to claim 3,
The failure sign determination unit fails the detector based on the fact that the level of the received light signal according to the test is not in the predetermined normal range including the reference value and is not in the predetermined failure range below the normal range. Judging as a sign,
The failure sign determination condition changing unit is a monitoring system characterized in that the reference value and the normal range are changed based on the change tendency of the level of the received light signal obtained from the test result information.
In the monitoring system according to any one of claims 1 to 4.
The failure sign determination unit and the failure sign determination condition change unit are arranged on the receiver panel, and the detector transmits test result information based on a light receiving signal when the test light source is driven to the receiver panel. A featured monitoring system.
In the monitoring system according to any one of claims 1 to 4.
The failure sign determination unit and the failure sign determination condition change unit are arranged on the receiver panel, and the detector transmits the light reception signal information based on the light reception signal when the test light source is driven to the receiver panel, and the detector is described. The receiving board is a monitoring system characterized in that test result information is generated based on the received signal information.
In the monitoring system according to any one of claims 1 to 6.
The failure sign determination unit and the failure sign determination condition change unit are arranged in the detector.
The receiver is a monitoring system characterized in that the detector is instructed to change the failure sign determination condition at a predetermined timing.

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