JPH0195398A - Fire alarm system - Google Patents

Abstract

PURPOSE:To prevent non-fire information due to the noise to occur due to an artificial cause by changing the fire discriminating reference in accordance with the number of persons of the installation place of a fire sensing device or a fire sensor. CONSTITUTION:A fire sensing device DE reads the person number data from a person number counter MC through an IF 3 and stores this into a RAM 1 for storing the person number data. On the other hand, in a ROM 2 for storing an alarm level table, other hand, in a ROM 2 for storing an alarm level table, the optimum alarm level value corresponding to the number of persons to exist at the installing place of the sensing device DE is stored. Then, the optimum alarm level value corresponding to the person number data stored to the RAM 1 is read from the ROM 2, and stored into a RAM 3 for work. With the stored alarm level value as a fire discriminating reference, the fire is discriminated. Thus, the optimum fire discriminating reference can be always set and the non-fire information can be prevented.

Description

[Detailed Description of the Invention] [Industrial Application Fields] The present invention is applicable to industrial applications, whether the fire detector itself determines the occurrence of a fire or
Alternatively, it relates to a fire alarm system in which a receiver (or repeater) determines the occurrence of a fire based on data collected from a fire sensor.

[Prior Art] Conventionally, a detector always has a constant alarm level (fire discrimination level) or accumulation time regardless of the time of day or the number of people in the room. For this reason, when the number of people in the room increases, noise increases due to people smoking, dust, and heaters. For this reason, many non-fire alarms were generated due to human causes, and the reliability of the fire alarm system was lost.

[Problems to be Solved by the Invention] Therefore, the present invention detects the number of people in the room, changes the alarm level, that is, the fire discrimination level, and the accumulation time, thereby reducing noise caused by human causes. The present invention aims to provide a fire alarm device that can prevent non-fire alarms.

[Means for solving the problem] Therefore, according to the present invention, a fire phenomenon detection means (FD);
Fire discriminating means (steps 111 and 1
18) A fire alarm system comprising: a people counter (MC) for detecting the number of people at the location where the fire phenomenon detection means is installed; and a fire discrimination by the fire discrimination means according to the number of people data detected by the people counter. A fire alarm device is provided which is characterized by comprising fire discrimination standard setting means (step 108) for setting a standard.

[Function] Fire discrimination criteria include alarm level (fire discrimination level), accumulation time, fire discrimination calculation formula, etc. The fire discrimination criteria may be changed by the detector itself or by the receiver. The number of people in a room can be detected by installing a so-called people counter such as a phototube counter, a capacitance counter, or an ID card reader at the entrance and exit of the room. By sending the calculated number of people in the room to the fire alarm system, the alarm level, accumulation time, etc. corresponding to the number of people in the room are set, making it possible to prevent non-fire alarms caused by human causes. becomes.

[Example] Hereinafter, an example of the present invention will be described based on the accompanying drawings.

FIG. 1 shows an embodiment of the fire alarm system according to the present invention. Multiple pieces are connected.

MC is a people counter connected to each fire detector to detect the number of people in the place where the fire detector DE is installed, such as a phototube type counter installed at the entrance/exit of a room, a capacitance type counter, etc. counter, ultrasonic counter, I
It may be a D card reader or the like.

In each fire detector DE, the MPU is a microcomputer, and the FD is a fire phenomenon detection device that detects fire phenomena such as smoke, heat, flame, or gas, and includes an amplifier that amplifies and outputs an analog quantity of the detected fire phenomenon. part, AD is analog
A digital (A/D) converter, IFl, is an interface, R, to which an analog-to-digital converter AD is connected.
OMI is a read-only memory for programs that stores programs explained in the flowcharts described later, and ROM2 stores an alarm level table that stores alarm levels (fire discrimination levels) according to the number of people. ROM3 is a read-only memory for storing an accumulation time table that stores accumulation times according to the number of people, and RAM1 stores the number of people data read from the number of people counter MC. Random access memory for storing the number of people data, RAM2,
Random access memory for counting the accumulation time, RAM3, which stores the count value of 1° for the accumulation time currently in progress.
is the f% business random access memory as the lv business area. Further, SQ is a signal sending unit that outputs a fire signal or a fire signal with its own address signal added to the signal line (or power supply/signal line) L, and IF2 is a signal sending unit S.
Fire signal output interface to which Q is connected, IF
3 is an interface for inputting a number of people signal to which a number of people counter MC is connected.

The operation of the fire alarm system shown in FIG. 1 will be described below with reference to FIG. 2 and subsequent figures.

When the system starts up, such as when the power is turned on, initial settings are first performed, and the RAM, IF, etc., including the fire signal output interface IF2, are cleared (step 101).
). Next, the number of people data output from the number of people counter MC■
1 from the number of people signal input interface IF3 (step 102), and stores it in the number of people data storage RAMI designated by the address count, and at the same time reads the number from the start address 5T of the accumulated time table storage ROM3.
Step 1: Store AD in work RAM 3 as ■2.
03), and RO for storing alarm level table
Set the start address ALAD of M2 as ■ to work RAM
3 (step 104).

An example of an alarm level table is shown in FIG. 3, an example of an accumulation time table is shown in FIG. 4, and an example of the RAM 1 for storing the number of people data from the number of people counter MC is shown in FIG. As can be seen from Figures 3 and 4, each table shows the optimal alarm level value corresponding to the number of people (maximum number of people N) present at the location where the sensor is installed, and the sensor・The value of the optimum accumulation time after the level becomes equal to or higher than the alarm level is stored. In this case, the addresses of the storage locations for the optimal values corresponding to each number of people are the starting address ALAD and 5, respectively.
It is the value of the number of people added to the TAD, and therefore, from these tables, if the number of people is detected, each uniquely optimal value is determined. An example of the contents of the alarm level table only is shown in FIG.

In steps 103 and 104, the values of ■2 and Vco are
- Once stored in the working RAM 3, the number of people data V
It is determined whether or not 1 is greater than the maximum number of people N in the alarm level table and the MN time table (step 105). The final address of the alarm level table stored in ROM 2 and the final address of the accumulated time table stored in ROM 3 are determined (step 106).
). Step 105 if the number of people is less than N people
By adding the number of people N to the start address signal of the alarm level table, the address V of the alarm level table corresponding to N is obtained, and the address V of the alarm level table corresponding to N is obtained. M corresponding to N by adding the number of people N to address V2
The address of the cumulative time table is determined (Step 1)
o7), and from those addresses ■ and V, alarm levels ■6 and ' are respectively suitable for the number of people and the environment.
T! Accumulation time count ■ is calculated (Step 10)
8).

Next, A/D converter AD detects A from the fire phenomenon detection section FD.
The senna level data (109), which has been converted into /D and sent via the interface IFI, is read (step 109), and the storage time count RAM 2 specified by the address 5TCNAD (an example is shown in FIG. 6) is read. ■ Accumulated time count value stored in ). is read (step 110), and this accumulation time count value ■1° is 0 if no abnormality has occurred yet.

The sensor level data V8 read in step 109 is compared with the alarm level V8 determined in step 108, and if the sensor level data V8 is smaller than the alarm level V6 (step 111). N
o), Vl. Clear the value of , that is, set it to O (step 112), store it in the accumulation time counting RAM 2 at address 5TCNAD (step 113), and clear the fire signal output interface IF2. Release (step 114), then wait for the next input (step 1)
15) The operations from step 102 are repeated.

If the sensor level data ■ is equal to or higher than the alarm level 76 (YES in step 111), the value of ■1° is incremented by one to count the accumulation time (step 116).
), the storage contents of the storage time counting RAM 2 are updated with the incremented storage time count value v1° (step 117), and the updated storage time count value V1° is
It is compared with the accumulation time count value 7 determined in step 108.

■If the value of 1° has not reached the value of V, (No in step 118), the fire signal output interface I
After clearing F2 (step 114), step 10
Repeat each step from step 2, and then, when the accumulated time count value ■1° reaches ■, (step 118)
YES), a fire signal is written to the fire signal output interface IF2 (step 119), and as a result, the fire signal is sent to the receiver via the signal sending unit SQ.

By the way, in the case of the above embodiment, the alarm level 6 and the accumulation time v1 change from moment to moment depending on the number of people.

However, after entering the fire discrimination operation, there are cases where it is not desired to change the alarm level (6) or the accumulation time (7), which are the fire discrimination criteria, or both.

In this case, for example, a flag bit is provided in the RAM 1 for storing the number of people data to indicate that fire detection is in progress, and in step 111 the sensor level data 8 is set as an alarm.
When the level reaches 76 or higher, a flag in the RAMI for storing the number of people data is set in step 116 to prohibit changing the number of people, and when the sensor level data vl is below the alarm level v6, the number of people data is stored in step 112. The flag in RAM 1 is reset to enable changes to the number of people data. As a result, during the fire detection operation, changing the memory contents of the RAM 1 for storing the number of people data is prohibited, so
The alarm level ■ and the accumulation time ■ do not change and remain constant.

In the above embodiment, the present invention was applied to a so-called fire detector in which the detector itself discriminates against fire and outputs only the result as a digital on/off signal. Alarm level setting changes based on the above can also be applied to fire alarm systems in which fire discrimination is performed on the receiver or repeater side based on analog signals from multiple connected fire sensors.

In this case, the receiver (or repeater) is provided with a fire discrimination means and a storage means corresponding to those explained in Figs. Signal lines are pulled and connected from these sensors so as to receive signals from the people counter MC to be placed.

The receiver (or repeater) polls the fire sensor and reads, for example, a digitized analog quantity signal of a fire phenomenon from the polled fire sensor, and also reads a people signal from a people counter associated with the fire sensor. The fire judgment process after reading the analog quantity signal and the number of people signal of this fire phenomenon is performed in steps 109 and 11.
This is the same as the flowchart of FIG. 2 (1) and (2) except for step 5.

In this case, the number of people counter MC is used as a receiver (or repeater)
Instead of connecting to the fire sensor, the fire sensor should send the number of people signal read from the number of people counter to the receiver along with the analog quantity signal only when it receives a call from the receiver. It's okay.

Furthermore, although the above embodiment shows a case in which all numbers of people are taken into consideration, if the number of people counter is an ID card, smokers are registered in the ID card and only the registered people are counted. It is also possible to input the number of people.

[Effects of the Invention] As described above, according to the present invention, the number of people at the location where the fire detector or fire sensor is installed is detected, and the alarm level and accumulation time of the fire alarm device are changed based on this number of people data. Therefore, it is possible to always set the optimum fire discrimination criteria, and it is possible to prevent non-fire alarms.

[Brief explanation of the drawing]

FIG. 1 is a program circuit diagram showing a fire alarm system according to an embodiment of the present invention, and FIG. 2 (1> and (2) is a first
FIGS. 3 to 7 are flowcharts for explaining the operations in FIG. 1. In FIG. 0, RE is a fire receiver, and DE is a fire alarm device. fire detector, MC is a people counter, MP
U is a microcomputer, FD is a fire phenomenon detection unit, A
D is an analog-to-digital (A/D) converter, IFI is an interface, ROM1 is a read-only memory for programming, ROM2 is a read-only memory for storing an alarm level table, and ROM3 is for storing an accumulation time table. Read-only memory, RAM1 is random access memory for storing the number of people data, RAM
M2 is a random access memory for counting accumulation time, RAM3 is a working random access memory, SQ
is a signal sending section, IF2 is an interface for outputting a fire signal, and IF3 is an interface for inputting a number of people signal.

Claims (8)

[Claims] (1) In a fire alarm device having a fire phenomenon detection means and a fire discrimination means for determining whether the detection output of the fire phenomenon detection means has reached a fire discrimination standard, the location where the fire phenomenon detection means is installed is A fire alarm device comprising: a people counter that detects the number of people; and fire discrimination standard setting means that sets a fire discrimination criterion of the fire discrimination means according to the number of people data detected by the people counter. (2) The fire alarm device according to claim 1, wherein the fire discrimination standard is a fire discrimination level. (3) The fire alarm device according to claim 1, wherein the fire discrimination criterion is an accumulation time. (4) The fire alarm device according to claim 1, wherein the fire discrimination criteria are a fire discrimination level and an accumulation time. (5) The fire discrimination standard setting means selects from the comparison means storing a fire discrimination criterion corresponding to the number of people data and the fire discrimination criterion corresponding to the number of people data detected by the number of people counter from the comparison means. and a selection means for determining the fire, whereby the fire determination means performs fire determination based on the fire determination criterion selected by the selection means. Fire alarm system. (6) The fire phenomenon detection means, the fire discrimination means, and the fire discrimination standard setting means are incorporated in a fire detector that is to detect a fire phenomenon, and the number of people counter is connected to the fire detector, and the number of people counter is connected to the fire detector. 6. The fire alarm device according to claim 1, wherein the fire detector outputs a signal indicating the presence or absence of a fire abnormality. (7) The fire phenomenon detection means is incorporated in a fire sensor that is to detect a fire phenomenon, the number of people counter is connected to the fire sensor, and the fire discrimination means and the fire discrimination standard setting means are installed in a receiver or a relay. The receiver or repeater collects the detection output of the fire phenomenon detection means from the fire sensor as well as the number of people data from the number of people counter, and determines the fire discrimination criteria set based on the number of people data. A fire alarm system according to any one of claims 1 to 5, wherein the fire alarm system is configured to perform fire discrimination based on the fire alarm system. (8) The fire phenomenon detection means is incorporated into a fire sensor that is to detect a fire phenomenon, the fire discrimination means and the fire discrimination standard setting means are provided in a receiver or a repeater, and the number of people counter is installed in the fire sensor. It is connected to a receiver or a repeater, whereby the receiver or repeater collects the detection output of the fire phenomenon detection means from the fire sensor, and performs a fire discrimination set based on the number of people data of the number of people counter. A fire alarm device according to any one of claims 1 to 5, wherein fire discrimination is performed based on a standard.