JP3093867B2 - Fire alarm system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to fire and
The present invention relates to a fire alarm system for determining non-fire.

[0002]

2. Description of the Related Art There has been proposed a fire alarm system for judging a fire or non-fire based on a change over time of an output level of a fire detector which can obtain an analog output. In this type of fire alarm system, it is necessary to make a fire / non-fire determination for all fire detectors.

[0003]

However, since this type of fire alarm system is usually provided with a large number of fire detectors, the output level of the fire detector changes with time for all the fire detectors. When a fire / non-fire is determined, a huge processing time is required. In particular, in the determination based on the time change, a plurality of past sampling values are required for one determination, so that one determination takes a relatively long time, and the time for sampling the output level of the fire detector is required. There is a problem that a determination result cannot be obtained within an interval (for example, 3 seconds).

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and to perform a fire detection for judging a fire / non-fire based on a time change while performing a fire / non-fire judgment for all fire detectors. An object of the present invention is to provide a fire alarm system in which an accurate judgment result can be obtained in a short time by limiting the number of vessels.

[0005]

According to the present invention, there is provided a fire alarm system for judging a fire or non-fire based on a time change of an output level of a fire detector from which an analog output is obtained. First storage means for storing data of all fire sensors within a predetermined time in the past;
The data stored in the first storage means is transferred for the fire detector whose output level has become equal to or higher than the predetermined forecast level, and thereafter, the data of the predetermined time is written for the fire detector. Storage means;
Determination means for determining a fire / non-fire based on a time change of the data stored in the storage means, wherein the determination means obtains a second result when the determination result for the fire detector is obtained.
The data of the fire detector in the storage means is erased.

[0006]

According to the above construction, the output level data is stored for all the fire detectors, and only the fire detectors whose output levels have exceeded the forecast level may have detected a fire. Fire based on time change
Since a non-fire determination is made, for fire detectors whose output level is less than the forecast level, it is clear that a fire has not been detected, and the determination of fire / non-fire over time is not performed. As a result, the number of fire detectors to be determined based on the time change can be significantly reduced. As described above, the number of fire detectors to be determined based on the time change is greatly reduced with respect to the number of all fire detectors. It can be shortened. That is, it is possible to obtain the determination result within a time interval of about the time interval for sampling the output data of the fire detector.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 2, a number of fire detectors 1 are connected to a receiver 2. An address is set for each of the fire sensors 1, and the receiver 2 can identify the position of the fire sensor 1 by recognizing the address of the fire sensor 1.

In this embodiment, as the fire detector 1, for example, a photoelectric smoke detector that detects smoke density using light scattering by smoke particles can be used. Receiver 2
Signal input unit 1 to which analog output of fire detector 1 is input
The signal input unit 11 performs preprocessing such as amplification and sampling at fixed time intervals. The output level data of all the fire sensors 1 sampled by the signal input unit 11 is stored in a data file 12 which is a first storage unit. The data file 12 stores data of a certain past time (for example, three minutes) for all the fire detectors 1. In addition, the output level of each fire detector 1 is determined by the level determination unit 13 to determine whether it has reached a predetermined forecast level. As shown in FIG. 3, the output level of the fire detector 1 rises when a fire occurs or the like, and is set to a level lower than the fire alarm level La which is a level for starting determination of whether or not a fire has occurred. A forecast level Lp for forecasting the possibility of occurrence is set. Therefore, in the level determination unit 13, when the output level of the specific fire detector 1 becomes equal to or higher than the forecast level Lp,
The data of the fire sensor 1 for a certain period of time in the past is taken from the data file 12 into the main memory 14 as the second storage means, and thereafter, the data in the main memory 14 is updated by the output of the fire sensor 1. Main memory 14
Is stored in the inference unit 15 serving as a determination unit.
Fire detector 1 by fuzzy inference
Fire / non-fire is determined based on the time change of the output level. That is, the determination of fire / non-fire based on the time change is made only for the specific fire sensor 1 whose data has been written in the main memory 14. Inference part 1
When a determination result indicating that a fire has occurred is obtained in 5, an alarm is issued through the fire notification unit 16. Also,
When the inference unit 15 obtains a determination result indicating that there is no fire, the process returns to the original state without issuing an alarm. If a judgment result is obtained in both cases of fire and non-fire, the data existing in the main memory 14 for the fire detector 1 for which the judgment result was obtained is deleted.

More specifically, as shown in FIG.
The level determining unit 13 first determines whether or not the output of the fire detector 1 stored in the data file 12 is already inference target data to be determined by the inference unit 15 (step S1). If not, it is determined whether it is equal to or higher than the forecast level Lp (step S2). If it is lower than the forecast level Lp, it is not regarded as inference target data, and if it is equal to or higher than the forecast level, the subsequent processing is performed as inference target data (step S3). That is, in step S1 or step S3, the data determined to be the inference target data is transferred to the main memory 14, and only the data transferred to the main memory 14 is determined by the inference unit 15 as described above. It is used for inference. When the inference by the inference unit 15 is completed and the determination result is obtained (step S4), the data regarding the fire detector 1 for which the determination result is obtained is deleted from the main memory 14 irrespective of whether the fire is a fire or a non-fire (step S4). Clear), and the level comparison unit 13
Is canceled (canceled) in the selection state as the inference target data.

As described above, it is determined that a fire may have been detected only when the output level of the fire detector 1 exceeds the forecast level, and the output data of the fire detector 1 is determined. Since the data is taken into the main memory 14 and the fire / non-fire judgment is performed in the inference unit 15, the number of fire detectors 1 that judge the fire / non-fire based on the time change can be greatly reduced. As a result, despite the determination of fire / non-fire for all the fire detectors 1, the fire detector 1 for which there is no possibility that a fire has been detected for the fire / non-fire over time is determined. By excluding it from the determination target, the time required for the determination is greatly reduced. In addition, in order to make a determination based on a time change, a plurality of sampling values are generally used at the same time. Therefore, it is necessary to put data in a work area secured on the main memory 14.
As compared with the case where data is stored on the main memory 14, the area occupied by the main memory 14 for the data to be determined can be greatly reduced, and as a result, the capacity of the main memory 14 can be reduced.

[0011]

As described above, according to the present invention, the output level data is stored for all the fire detectors, and it is possible that the fire is detected only for the fire detectors whose output level is higher than the forecast level. As an example, fire / non-fire determination based on time change is performed.For fire detectors whose output level is less than the forecast level, it is clear that fire has not been detected. By not performing the non-fire determination, the number of fire detectors to be determined based on time change can be significantly reduced. As described above, the number of fire detectors to be determined based on the time change is greatly reduced with respect to the number of all fire detectors. It can be shortened. That is, it is possible to obtain the determination result within a time interval of about the time interval for sampling the output data of the fire detector.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing the operation of each unit of an embodiment.

FIG. 2 is a block circuit diagram of the embodiment.

FIG. 3 is an explanatory diagram showing a concept of a forecast level in the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fire detector 2 Receiver 11 Signal input unit 12 Data file 13 Level judgment unit 14 Main memory 15 Inference unit 16 Fire notification unit

──────────────────────────────────────────────────続 き Continuation of front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G08B 17/00-17/12

Claims (1)

(57) [Claims] 1. A fire alarm system for judging a fire / non-fire based on a time change of an output level of a fire sensor from which an analog output is obtained, stores data of all the fire sensors within a predetermined time in the past. The data stored in the first storage means is transferred to the first storage means and the fire detector whose output level has become equal to or higher than the predetermined forecast level. A second storage unit to which data is written; and a determination unit that determines whether a fire or a non-fire occurs based on a time change of the data stored in the second storage unit. A fire alarm system, wherein when the judgment result is obtained, the data of the fire detector in the second storage means is deleted.