JP5409448B2 - Disaster prevention system - Google Patents

Description

  The present invention relates to a disaster prevention system in which a disaster prevention reception panel automatically determines the state of a fire detector and makes a fire determination according to the state of each fire detector.

  In a fire detection system having a conventional accumulation function, if the calculated average value is large (in the case of a smoke detector, for example, 7% / m), there is a high possibility of an actual fire, so the accumulation time is relatively short. (For example, 10 seconds), and if the calculated average value is small (in the case of a smoke detector, for example, 2% / m), there is a high possibility of non-fire, so the accumulation time is relatively long ( For example, a system for setting (for example, 50 seconds) is known (see, for example, Patent Document 1).

JP-A-9-288781

  In the above conventional example, a fire signal may be transmitted due to deterioration of the function other than at the time of fire detection due to contamination of the fire detection unit, deterioration of functional parts, cable deterioration, etc., but this fire signal detected a fire Because it is not a thing, if it is determined that the disaster prevention reception board is a fire, it will be falsely reported.

  An object of this invention is to provide the disaster prevention system which can reduce the misinformation by a transient phenomenon, the function fall of a fire detector, etc.

The disaster prevention system of the present invention is a disaster prevention system comprising a disaster prevention reception board, and a plurality of fire detectors connected to the disaster prevention reception board by a signal line and arranged in a tunnel that is monitored and controlled from the disaster prevention reception board. In the system, the disaster prevention receiving panel includes a signal pulse receiving means for receiving a signal pulse corresponding to a physical phenomenon detected by the fire detector from the fire detector, and a signal pulse received from the fire detector is a cause of the fire. A determination means for determining whether the signal pulse is due to a factor other than a fire or a signal pulse due to a factor other than a fire, and the received signal pulse is a signal pulse due to a fire factor If judged, the fire alarm output means that gives a fire alarm after the accumulation time in the disaster prevention reception board has passed, and the received signal pulse is a signal due to the cause of the fire. If it is determined to be a pulse, the accumulation time in the disaster prevention reception board is set as a predetermined accumulation time, and if it is determined that the received signal pulse is a signal pulse due to a factor other than a fire, the accumulation time in the disaster prevention reception board And an accumulation time changing means for changing.

  According to the present invention, since the fire judgment time (accumulation time) is set for each fire detector according to the state of each fire detector, a false alarm due to a transient phenomenon or a deterioration in the function of the fire detector, etc. There is an effect that can be reduced.

It is a figure which shows the disaster prevention system 100 for tunnels which is Example 1 of this invention. In Example 1, it is a figure which shows the example of the signal pulse which fire detector SE1 outputs. 3 is a flowchart illustrating an accumulation time changing operation according to the first exemplary embodiment.

  The modes for carrying out the invention are the following examples.

  FIG. 1 is a diagram showing a tunnel disaster prevention system 100 that is Embodiment 1 of the present invention.

  The disaster prevention system for tunnel 100 includes a disaster prevention receiving board 10 and fire detectors SE1, SE2, SE3, and SE4 installed for each system in the tunnel.

  The disaster prevention receiving board 10 includes a signal pulse receiving means 11, a judging means 12, an accumulation time changing means 13, a fire alarm output means 14, and a database 15.

  The signal pulse receiving means 11 receives signal pulses corresponding to the physical phenomenon detected by the fire detectors SE1 to SE4 from the fire detectors SE1 to SE4.

  The determination means 12 determines whether the signal pulse received from the fire detectors SE1 to SE4 is a signal pulse due to a fire factor or a signal pulse due to a factor other than a fire. In other words, the judging means 12 compares the pulse interval of the received signal pulse with the time of each pulse interval stored in the database 15 so that the pulse interval of the received signal pulse is a signal pulse due to a fire factor. It is a means for judging whether there is a signal pulse due to a factor other than a fire. By determining the pulse interval of the received signal pulse, the pulse interval of the received signal pulse is compared with the time of each pulse interval stored in the database 15.

  If it is determined that the received signal pulse is a signal pulse due to a cause of fire, the accumulation time changing means 13 fires via the fire alarm output means 14 after the elapse of a predetermined accumulation time set in the database 15 in advance. On the other hand, if it is determined that the received signal pulse is a signal pulse due to a factor other than a fire, the accumulation time of the fire detector in the database 15 is changed based on the pulse interval of the received signal pulse. That is, for example, the accumulation time changing means 13 changes the accumulation time to a second predetermined time longer than the first predetermined time if it is a signal pulse generated by a transient phenomenon (noise or the like), If it is a signal pulse generated when the fire detectors SE1 to SE4 have failed, it is means for changing the accumulation time to a third predetermined time longer than the second predetermined time.

  The fire alarm output means 14 is a means for issuing a fire alarm by ringing a district bell, turning on an indicator lamp or the like when receiving a fire signal from the fire detectors SE1 to SE4.

  The database 15 is an example of a storage unit and stores an accumulation time.

  The fire detectors SE <b> 1 to SE <b> 4 include fire detection means 21, signal processing means 22, and fire signal pulse transmission means 22. The configuration of each of the fire detectors SE2 to SE4 is the same as that of the fire detector SE1.

  Next, the operation of the first embodiment will be described.

  FIG. 2 is a diagram illustrating an example of signal pulses output from the fire detectors SE1 to SE4 in the first embodiment.

  FIG. 2 (1) shows a normal signal pulse, which is always a Low level signal. FIG. 2 (2) shows a signal pulse (fire signal pulse) at the time of a fire, and pulses are sent out at regular intervals. FIG. 2 (3) is a signal pulse generated due to a factor other than a fire, and is a signal pulse that occurs accidentally, such as noise or a false report by a radio device mounted on an automobile.

  The signal pulses (fire signal pulses) at the time of fire of the fire detectors SE1 to SE4 are continuously output every sampling period (for example, 2.6 seconds) of fire detection. On the other hand, signal pulses due to factors other than fire are not always output continuously like signal pulses at the time of fire. Therefore, the interval between the signal pulses due to factors other than the fire becomes longer than that at the time of the fire.

  FIG. 3 is a flowchart illustrating the accumulation time changing operation of the disaster prevention receiving board 10 according to the first embodiment. In the following description, the description will be given focusing on the fire detector SE1, but each operation of the fire detectors SE2 to SE4 is the same as the operation in the fire detector SE1.

  In S1, a signal pulse is received from the fire detector SE1, and in S2, it is determined whether the pulse interval matches the fire determination pulse (below a predetermined pulse interval). That is, it is determined whether or not the pulse interval t1 is less than 8 seconds, for example. If the pulse interval t1 is less than 8 seconds, it is determined in S3 that it is a fire pulse. Then, in S4, after elapse of the accumulation time set in the database 15, it is determined whether or not the disaster prevention receiving board 10 has already accumulated and restored. If the accumulation and restoration have not been completed, a fire signal pulse is sent from the database 15 in S5. Search the input accumulation time (for example, 4 seconds) for the fire detector. In S6, the accumulation time is measured, and in S7, accumulation recovery processing is performed. That is, the disaster prevention receiving board 10 turns off the information that the fire detector SE1 is a fire. Then, the process returns to S1.

  Then, when the signal pulse is received again within 8 seconds from the fire detector SE1, the same processing as S1 to S3 is executed, and it is determined whether or not the accumulation is restored in S4. Fire alarm.

  On the other hand, if it is determined that the pulse interval of the signal pulse received in S2 is 8 seconds or more, the signal pulse interval is determined in S21, and it is determined in S22 whether the pulse interval is 1 hour or more. If it is determined that the time is 1 hour or longer, the storage time is returned to the default (for example, 4 seconds) in S23, the set storage time is rewritten in the database 15 in S24, and the process returns to S1. That is, if the pulse interval is 1 hour or more, it is determined that the signal pulse is, for example, a signal pulse due to transient noise or the like and not a fire signal pulse.

  If it is determined in S22 that the pulse interval is less than 1 hour, it is determined in S31 whether the pulse interval is 10 minutes to 1 hour, and if the pulse interval is determined to be 10 minutes to 1 hour. In S32, the accumulation time is set to default × 2 (= 8 seconds), and the process proceeds to S24. That is, if the pulse interval is 10 minutes to 1 hour, for example, it is determined that the pulse is from a radio device mounted on the automobile that has passed in front of the fire detector SE1, and the accumulation time is set to default × 2 ( = 8 seconds).

  If it is determined in S31 that the pulse interval is shorter than 10 minutes, it is determined in S41 whether the pulse interval is 30 seconds to 10 minutes, and if the pulse interval is determined to be 30 seconds to 10 minutes. In S42, the accumulation time is set to default × 3 (= 12 seconds), and the process proceeds to S24.

  If it is determined in S41 that the pulse interval is shorter than 30 seconds, it is determined in S51 whether the pulse interval is 8 seconds to 30 seconds, and if the pulse interval is determined to be 8 seconds to 30 seconds. In S52, the accumulation time is set to default × 4 (= 16 seconds), and the process proceeds to S24. That is, if the pulse interval is 8 seconds to 30 seconds, for example, signal pulses are often generated due to a failure of the fire detector SE1, and therefore the accumulation time is set to default × 4 (= 16 seconds). If it is determined in S51 that the pulse interval is not 8 seconds to 30 seconds, the process returns to S2.

  The disaster prevention reception board 10 sets the accumulation time to a first predetermined time (for example, an initial value of 4 seconds) for those that tend to occur less frequently after being generated once, such as transient noise. Is set to a longer second predetermined time (for example, 8 seconds), and once it occurs once such as a failure due to deterioration of parts of the fire detectors SE1 to SE4, The accumulation time is set to a third predetermined time (for example, 16 seconds) longer than the second predetermined time. In addition, the disaster prevention receiving board 10 is set to a storage time between the two (for example, 12 seconds) for those that tend to be temporarily generated after being generated once, such as a radio mounted on an automobile. To do.

  In Example 1, the pulse interval is divided into five stages of less than 8 seconds, 8 seconds to 30 seconds, 30 seconds to 10 minutes, 10 minutes to 1 hour, 1 hour or more, but 4 stages or less or 6 stages. You may make it classify by the above. Further, the interval time of each stage may be set to a time different from the above.

  According to the above embodiment, the fire determination time (accumulation time) is set for each of the fire detectors SE1 to SE4 according to the state of each of the fire detectors SE1 to SE4, so that false alarms can be reduced.

100 ... Disaster prevention system for tunnels,
10 ... Disaster prevention reception board,
11: Signal pulse receiving means,
12 ... judgment means,
13: Accumulation time changing means,
14 ... Fire alarm means,
15 ... Database,
SE1, SE2, SE3, SE4 ... Fire detectors.

Claims (2)

In a disaster prevention system comprising a disaster prevention reception board, and a plurality of fire detectors connected to the disaster prevention reception board by a signal line and arranged in a tunnel monitored and controlled from the disaster prevention reception board,
The above disaster prevention reception board
Signal pulse receiving means for receiving from the fire detector a signal pulse corresponding to a physical phenomenon detected by the fire detector;
Determining means for determining whether the signal pulse received from the fire detector is a signal pulse due to a cause of fire or a signal pulse due to a factor other than a fire based on a pulse interval of the signal pulse;
Fire alarm output means for providing a fire alarm after the accumulation time in the disaster prevention reception panel has elapsed if the received signal pulse is determined to be a signal pulse due to a fire factor;
If it is determined that the received signal pulse is a signal pulse due to a fire factor, the accumulation time in the disaster prevention reception panel is set as a predetermined accumulation time, and the received signal pulse is determined to be a signal pulse due to a factor other than a fire. A storage time changing means for changing the storage time in the disaster prevention reception board;
The disaster prevention system characterized by having. In claim 1,
The determination means compares the pulse interval of the received signal pulse with the time stored in the storage means to determine whether the received signal pulse is a signal pulse due to a fire factor or other than a fire. A disaster prevention system characterized in that it is a means for judging whether a signal pulse is caused by a factor .

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