JPH0962960A - Intelligent fire sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fire sensor speedily sensing a real fire in spite of not easily sensing the generation of temporary smoke or temp. rising by enabling to set and change a suspending time until the judging of the output of a second fire signal after outputting a first fire signal. SOLUTION: The fire sensor is provided with a fire sensing part 13 outputting a detection signal corresponding to the smoke and environmental temp., an average calculation part 15 calculating the average of this detection signal, a comparing and discriminating part 14 comparing and discriminating the detection signal and a fire discrimination level, and a signal processing part 11 outputting the first fire signal when the detection signal is over the fire detection level and outputing the second fire signal when the detection signal is over the fire detection level after prescribed suspending time. The signal processing part 11 sets and changes the suspending time corresponding to the average within a fixed time of the detection signal calculated by the average calculation part 15 before the first fire signal is outputted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intelligent fire detector, and more particularly to a microcomputer-operated type fire alarm capable of accurately reporting a real fire to a storage fire receiver. Intelligent fire detector.

[0002]

2. Description of the Related Art Conventionally, a fire detector connected to a fire receiver detects smoke or environmental temperature and outputs a fire signal when the detected level exceeds a predetermined threshold value. . On the fire receiver side, by receiving this fire signal,
It is determined whether a fire has actually occurred. If the fire receiver is a non-accumulation type, it is judged to be a fire when the fire signal is received, and if it is a accumulation type, the first fire signal is received. At that time, it is not judged as a fire, the power supply to the fire detector is cut off, the operation of the fire detector is restored once, and then the second fire signal is output within the preset accumulation time. When it is received, it is judged as a fire for the first time, and a fire alarm is output (double storage type).

[0003]

However, in the above-mentioned conventional fire detector, when the detection signal level of smoke or environmental temperature exceeds a predetermined threshold value, the fire signal is always output.
Even if there is a temporary smoke or temperature rise within a predetermined time after the first fire signal is output, the second fire signal is output and the fire receiver is a storage type. Even then, there was a case where it was judged that a fire occurred in the fire receiver. As a result, a fire alarm was erroneously output and the reliability of the entire system was impaired.

The present invention has been made in view of the above circumstances, and by providing an appropriate pause time after outputting the first fire signal, and then determining the output of the second fire signal, It is an object of the present invention to provide an intelligent fire detector that can accurately notify a fire receiver of the occurrence of an actual fire.

[0005]

The present invention proposed to achieve the above object has the following structural features. The intelligent fire detector according to claim 1, wherein the fire detector outputs a detection signal according to smoke or environmental temperature, and an average value calculation for calculating an average value of the detection signals output from the fire detector. Section, a detection signal output from the fire detection section and a preset fire determination level are compared, and a comparison determination section that determines whether the detection signal exceeds the fire determination level, and the determination of this comparison determination section According to the result, when the detection signal exceeds the fire discrimination level, the first fire signal is output, and after the lapse of a predetermined preset down time, the detection signal from the fire detection unit is fetched and compared. As a result of the comparison and determination performed again by the determination unit, the signal processing unit that outputs the second fire signal when the detection signal exceeds the fire determination level is provided.

According to a first aspect of the present invention, the signal processing unit determines that the average value of the detection signals calculated by the average value calculation unit within a certain period of time is smaller than a predetermined value before the first fire signal is output. Sets the pause time to a time longer than the initial value, and in claim 2 sets the pause time to a time shorter than the initial value when the average value is larger than a predetermined value.
Further, in claim 3, the means of both claim 1 and claim 2 are provided, and when the average value is smaller than the predetermined value, the pause time is set and changed to a time longer than the initial value, while the average When the value is larger than the predetermined value, the pause time is set and changed to a time shorter than the initial value.

As described above, in claims 1 to 3, after the first fire signal is output, the pause time until the second fire signal is output is determined, and the first fire signal is output. It is specified according to the average value of the detection signal before the operation. The intelligent fire detector according to claims 4 to 6 has the same structure as that of claims 1 to 3, and includes a fire detector and
Comparison judgment that compares the detection signal output from the fire detection part with the preset fire discrimination level and a predetermined overlevel exceeding this fire discrimination level, and judges whether the detection signal exceeds these levels. And a signal processing unit.

According to a fourth aspect of the present invention, the signal processing unit compares the detection signal with the overlevel by the comparison / determination unit after the first fire signal is output, and if the detection signal does not exceed the overlevel. Sets the pause time to a time longer than the initial value, and in claim 5 sets the pause time to a time shorter than the initial value when the detection signal exceeds the overlevel. Further, in claim 6, the means of both claim 4 and claim 5 are provided, and when the detection signal does not exceed the overlevel, the pause time is set and changed to a time longer than the initial value, If the detection signal at this time exceeds the overlevel, the pause time is set and changed to a time shorter than the initial value.

As described above, in claims 4 to 6, after the first fire signal is output, the pause time until the second fire signal is output is determined, and the first fire signal is output. Immediately after that, it is regulated depending on whether the detection signal exceeds an overlevel larger than the fire discrimination level.
The intelligent fire detector according to claim 7 has the same configuration as that according to claims 1 to 6, and includes a fire detector, a detection signal output from the fire detector, and a preset fire determination level. A comparison / determination unit for comparing and determining whether or not the detection signal exceeds the fire determination level; an integration circuit for integrating the difference between the detection signal output from the fire detection unit and the fire determination level; and a signal processing unit. This signal processing unit, when the detection signal exceeds the fire determination level by the comparison determination unit after the first fire signal is output, the down time is detected by the integration circuit. The setting is changed according to the integrated value obtained by integrating the difference between the fire detection level and the fire determination level for a predetermined time.

When the integral value is small, the pause time may be set longer than the initial value, and as the integral value becomes larger, the pause time may be set shorter than the initial value.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. [First Embodiment of the Invention] An intelligent fire detector 1 according to claims 1 to 3 will be described with reference to Figs.

FIG. 1 is a block diagram showing an example of the configuration of the intelligent fire detector 1. The intelligent fire detector 1 is connected to the signal line L derived from the fire receiver 2 to construct a fire alarm system. This fire receiver 2 is a two-time storage type, and when the first fire signal from the fire detector 1 is received, it is not judged to be a fire, but after the operation of the fire detector is restored once. When the second fire signal is received within a preset predetermined accumulation time, it is judged that a fire has occurred, and the sounding of the audio device, the interlocking of smoke-preventing equipment, etc. are performed.

The intelligent fire detector 1 is a CPU
A signal processing unit 11 configured by, for example, a transmission control unit 12 for performing transmission with the fire receiver 2, a fire detection unit 13 that outputs a detection signal according to smoke or environmental temperature, and a fire detection unit 1
A comparison determination unit 14 that compares the detection signal output from 3 with a preset fire determination level to determine whether the detection signal exceeds the fire determination level, and the fire detection unit 13
And an average value calculation unit 15 that calculates the average value of the detection signals output from.

When the multiplex transmission system is not adopted, the transmission controller 12 is composed of a relay or the like. When the multiplex transmission system is adopted, the address and the alarm signal of the fire detector 1 can be output. . In the signal processing unit 11, the comparison / determination unit 1
According to the determination result of No. 4, the first fire signal is output when the detection signal exceeds the fire determination level, and the detection signal from the fire detection unit 13 after the elapse of a predetermined rest time after that. When the detection signal exceeds the fire determination level as a result of the comparison and determination performed again by the comparison determination unit 14, the second fire signal is output.

In the fire detector 1 according to any one of claims 1 to 3, after the first fire signal is output, the signal processing unit 11 waits until the signal detection unit 13 receives the detection signal from the fire detecting unit 13. It is characterized in that it is regulated according to the average value of the detection signals before outputting the fire signal. This fire detector 1
The basic operation of will be described with reference to FIG.

FIG. 1A shows an example in which the first fire signal is output due to the generation of transient smoke and the temperature rise.
In this case, in general, the level of the detection signal before the first fire signal is output abruptly rises, so the average value of the detection signals within the average value calculation time Ta calculated by the average value calculation unit 15 at this time is a predetermined value. It is smaller than the value. When the signal processing unit 11 judges this, the rest time is set and changed to the time t1 longer than the initial value (claim 1).

During the pause time t1, even if the detection signal exceeds the fire discrimination level, no fire signal is output. If the detection signal exceeds the fire discrimination level within the fire discrimination time T after the pause time t1 has elapsed. , Fire signal is output. However, since transient smoke does not occur within the rest time t1,
It does not output the second fire signal. FIG.
Is an example when an actual fire occurs, and the level of the detection signal before the first fire signal is output is that the fire is gradually advancing, so the detection within the average value calculation time Ta The average value of the signal becomes larger than the predetermined value. Signal processing unit 1
In No. 1, when this is judged, the rest time is set and changed to the time t2 shorter than the initial value (claim 2).

When an actual fire occurs, the detection signal continues to exceed the fire discrimination level even after the first fire signal is output. In this case, however, it is necessary to give an early fire notification. If t2 is set to be short and the detection signal exceeds the fire determination level within the fire determination time T after the suspension time t2 has elapsed, the second fire signal is output. In addition, 1
In the fire detector 1 of the stand, both the operations (a) and (b) in the figure can be performed, and when the average value calculated by the average value calculation unit 15 is smaller than the predetermined value, the down time is set. The setting is changed to a time t1 longer than the initial value, and when it is longer than a predetermined value, the rest time is changed to a time t2 shorter than the initial value (claim 3).

[Embodiment 2 of the Invention] Next, claims 4 to
The intelligent fire detector 1 described in 6 will be described with reference to FIGS. FIG. 3 is a block diagram showing an example of the configuration of the intelligent fire detector 1.

The intelligent fire detector 1 has the same structure as the fire detector 1 according to claims 1 to 3 (see FIG. 1), and includes a signal processing unit 11, a transmission control unit 12, and
The fire detection unit 13 and the comparison determination unit 14 are provided, and the comparison determination unit 14 compares the detection signal of the fire detection unit 13 with the fire determination level and a predetermined overlevel exceeding the fire determination level. It is supposed to do.

In the fire detector 1 of claims 4 to 6, after the first fire signal is output, the signal processing unit 11 waits until the signal is received from the fire detector 13 for the first time. Immediately after the fire signal is output, the detection signal is characterized by whether it exceeds a predetermined overlevel. The basic operation of the fire detector 1 will be described with reference to FIG.

FIG. 1A shows an example of outputting the first fire signal due to the generation of transient smoke and the temperature rise.
In this case, generally, the level of the detection signal after outputting the first fire signal does not rise rapidly, so that the detection signal does not exceed the overlevel within the overlevel determination time Tb. In the signal processing unit 11, the comparison / determination unit 1
Based on the determination result of 4, the rest time is set and changed to a time t1 longer than the initial value (claim 4).

During the pause time t1, no fire signal is output even if the detection signal exceeds the fire discrimination level and the over level. If the detection signal exceeds the fire discrimination level after the pause time t1, a fire signal is output. To do. Here, the fire determination time T shown in FIG. 2 is not provided (T = 0), and the comparison determination unit 14 determines the output of the fire signal immediately after the lapse of the pause time t1.

FIG. 2B is an example when an actual fire occurs. Since the level of the detection signal continues to rise after the first fire signal is output, the overlevel discrimination time Tb. Within, the detection signal exceeds the over level. In the signal processing unit 11, the pause time is set and changed to the time t2 shorter than the initial value based on the determination result by the comparison determination unit 14 (claim 5). When the detection signal exceeds the fire determination level after the quiescent time t2, the second fire signal is output.

It should be noted that one fire detector 1 can perform both operations shown in FIGS. 3A and 3B, and the detection signal exceeds the overlevel after the first fire signal is output. If not, the pause time is changed to a time t1 longer than the initial value, and if the detection signal exceeds the overlevel, the pause time is changed to a time t2 shorter than the initial value (claim 6).

[Third Embodiment of the Invention] Next, an intelligent fire detector 1 according to a seventh embodiment will be described with reference to FIG.
This will be described using 6. FIG. 5 is a block diagram showing an example of the configuration of the intelligent fire detector 1.

The intelligent fire detector 1 has the same structure as the fire detector 1 according to claims 1 to 3 (see FIG. 1), and includes a signal processing unit 11, a transmission control unit 12, and
Fire detection unit 13, comparison determination unit 14, fire detection unit 13
An integrating circuit 16 that integrates the difference between the detection signal output from the device and the fire discrimination level is provided. The signal processing unit 11
After outputting the first fire signal, the comparison / determination unit 1
If the detection signal exceeds the fire discrimination level by 4, the integration time is changed by the integration circuit 16 according to the integrated value obtained by integrating the difference between the detection signal and the fire discrimination level for a predetermined time.

The basic operation of the fire detector 1 will be described with reference to FIG. FIG. 3A is an example in which the first fire signal is output due to the generation of transient smoke or temperature rise,
FIG. 2B is an example in which the first fire signal is output due to an actual fire. As shown in the figure, when a fire actually occurs, the level of the detection signal after the first fire signal is output continues to rise, and the predetermined integration time Tc
The integrated value at (shaded area) is larger than that when there is no fire.

In the signal processing unit 11, when the integral value is small, the pause time is set and changed to a time t1 longer than the initial value, and as the integral value becomes larger, the pause time becomes shorter t2 than the initial value. Change the setting. As described above, the first embodiment of the invention
3 to 3 explained the three methods of defining the downtime after outputting the first fire signal, but these downtime may be obtained by combining these methods, and in the case of an actual fire. When it is determined that there is such a time, the second fire signal may be output without providing a pause time or interrupting the pause time.

[0030]

As can be understood from the above description, according to the intelligent fire detector of the present invention,
After outputting the second fire signal, an appropriate pause time is provided, and then the detection signal level of smoke and ambient temperature is judged, and the second fire signal is output, so there is no possibility of transient smoke generation. Since it becomes insensitive to the temperature rise and only the actual fire is reported, the fire receiver side can accurately judge the occurrence of the fire, thus increasing the reliability of the fire alarm system as a whole.

In other words, when a transient smoke is generated or the temperature rises, the pause time is set to be long, so that a transient detection signal continuously generated during that period is not output as a fire signal. When an actual fire occurs, the pause time is set to be short, so that the second fire signal can be output quickly. According to claims 1 to 3, since the downtime is defined according to the average value of the detection signal before the first fire signal is output, the average value is small, the transient detection signal. In the case of output, the pause time can be set to a long time, and in the case of a detection signal output due to an actual fire whose average value is large, the pause time can be set to a short time.

According to claims 4 to 6, the rest time is set to the first
After the fire signal is output for the second time, it is defined depending on whether the detection signal exceeds a predetermined over level higher than the fire judgment level. In this case, the pause time can be set to a long time, and when the detection signal exceeds the overlevel and the detection signal is output due to an actual fire, the pause time can be set to a short time.

According to the seventh aspect of the present invention, the rest time is determined according to the integral value of the difference when the detection signal exceeds the fire discrimination level within a predetermined time after the first fire signal is output. Since it is specified, in the case of a transient detection signal output with a small integral value, set the pause time to a long time, and with a large integration value, in the case of a detection signal output due to an actual fire. , The pause time can be set to a short time.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of a configuration of an intelligent fire detector according to claims 1 to 3 of the present invention.

2A and 2B are diagrams for explaining an example of a basic operation of the intelligent fire detector according to claims 1 to 3 of the present invention.

FIG. 3 is a block diagram showing an example of a configuration of an intelligent fire detector according to claims 4 to 6 of the present invention.

4 (a) and (b) are diagrams for explaining an example of a basic operation of the intelligent fire detector according to claims 4 to 6 of the present invention.

FIG. 5 is a block diagram showing an example of the configuration of the intelligent fire detector according to claim 7 of the present invention.

6 (a) and 6 (b) are diagrams for explaining an example of the basic operation of the intelligent fire detector according to claim 7 of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Intelligent fire detector according to the present invention 11 ... Signal processing unit 12 ... Transmission control unit 13 ... Fire detection unit 14 ... Comparison determination unit 15 ... Average value calculation unit 16. ..Integrator circuit 2 ... Fire receiver L ... Signal line t1 ... Rest time (time longer than initial value) t2 ... Rest time (time shorter than initial value) Ta ... Average value calculation Time Tb ・ ・ ・ Over level judgment time Tc ・ ・ ・ Integration time T ・ ・ ・ Fire judgment time

Claims (7)

[Claims] 1. A fire detector that outputs a fire signal when the detection signal output according to smoke or environmental temperature exceeds a predetermined threshold, and outputs the detection signal according to smoke or environmental temperature. A fire detection unit, an average value calculation unit that calculates an average value of detection signals output from this fire detection unit, a detection signal output from the fire detection unit, and a preset fire determination level are compared, According to the comparison determination unit that determines whether the detection signal exceeds the fire determination level, and the determination result of this comparison determination unit, the first fire signal is output when the detection signal exceeds the fire determination level, After the lapse of a predetermined preset rest time after that, the detection signal from the fire detection unit is fetched, and the comparison and determination unit again performs comparison and determination, and when the detection signal exceeds the fire determination level, A signal processing unit for outputting a second fire signal, wherein the signal processing unit outputs the detection signal within a certain period of time of the detection signal calculated by the average value calculation unit before the first fire signal is output. If the average value is smaller than the predetermined value,
An intelligent fire detector that is configured to change the above rest time to a time longer than the initial value. 2. A fire detector that outputs a fire signal when the detection signal output according to smoke or environmental temperature exceeds a predetermined threshold, and outputs the detection signal according to smoke or environmental temperature. A fire detection unit, an average value calculation unit that calculates an average value of detection signals output from this fire detection unit, a detection signal output from the fire detection unit, and a preset fire determination level are compared, According to the comparison determination unit that determines whether the detection signal exceeds the fire determination level, and the determination result of this comparison determination unit, the first fire signal is output when the detection signal exceeds the fire determination level, After the lapse of a predetermined preset rest time after that, the detection signal from the fire detection unit is fetched, and the comparison and determination unit again performs comparison and determination, and when the detection signal exceeds the fire determination level, A signal processing unit that outputs a second fire signal, wherein the signal processing unit averages the detection signals calculated by the average value calculation unit before the first fire signal is output within a certain period of time. When the value is larger than a predetermined value, the intelligent fire detector configured to change the rest time to a time shorter than the initial value. 3. A fire detector that outputs a fire signal when the detection signal output according to smoke or environmental temperature exceeds a predetermined threshold, and outputs the detection signal according to smoke or environmental temperature. A fire detection unit, an average value calculation unit that calculates an average value of detection signals output from this fire detection unit, a detection signal output from the fire detection unit, and a preset fire determination level are compared, According to the comparison determination unit that determines whether the detection signal exceeds the fire determination level, and the determination result of this comparison determination unit, the first fire signal is output when the detection signal exceeds the fire determination level, After the lapse of a predetermined preset rest time after that, the detection signal from the fire detection unit is fetched, and the comparison and determination unit again performs comparison and determination, and when the detection signal exceeds the fire determination level, A signal processing unit that outputs a second fire signal, wherein the signal processing unit averages the detection signals calculated by the average value calculation unit before the first fire signal is output within a certain period of time. If the value is smaller than the predetermined value, the rest time is changed to a time longer than the initial value,
When the average value is larger than a predetermined value, the intelligent fire detector configured to change the rest time to a time shorter than the initial value. 4. A fire detector that outputs a fire signal when the detection signal output according to smoke or environmental temperature exceeds a predetermined threshold, and outputs the detection signal according to smoke or environmental temperature. The fire detection unit, the detection signal output from this fire detection unit, the preset fire discrimination level, and the predetermined overlevel exceeding this fire discrimination level are compared, and whether the detection signal exceeds these levels. Based on the comparison determination unit that determines whether or not the detection signal exceeds the fire determination level, the first fire signal is output when the detection signal exceeds the fire determination level, and a predetermined pause time after that is set. After a lapse of time, the detection signal from the fire detection unit is fetched and compared and discriminated again by the comparison discrimination unit, and as a result, when the detection signal exceeds the fire discrimination level, the second fire signal is output. The signal processing unit compares the detection signal with the overlevel by the comparison determination unit after the first fire signal is output, and the detection signal does not exceed the overlevel. In some cases, the intelligent fire detector is configured to change the rest time to a time longer than the initial value. 5. A fire detector that outputs a fire signal when the detection signal output according to smoke or environmental temperature exceeds a predetermined threshold, and outputs the detection signal according to smoke or environmental temperature. The fire detection unit, the detection signal output from this fire detection unit, the preset fire discrimination level, and the predetermined overlevel exceeding this fire discrimination level are compared, and whether the detection signal exceeds these levels. Based on the comparison determination unit that determines whether or not the detection signal exceeds the fire determination level, the first fire signal is output when the detection signal exceeds the fire determination level, and a predetermined pause time after that is set. After a lapse of time, the detection signal from the fire detection unit is fetched and compared and discriminated again by the comparison discrimination unit, and as a result, when the detection signal exceeds the fire discrimination level, the second fire signal is output. The signal processing unit compares the detection signal with the overlevel by the comparison determination unit after the first fire signal is output, and the detection signal exceeds the overlevel. In some cases, the intelligent fire detector is configured to change the rest time to a time shorter than the initial value. 6. A fire detector, which outputs a fire signal when the detection signal output according to smoke or environmental temperature exceeds a predetermined threshold value, outputs the detection signal according to smoke or environmental temperature. The fire detection unit, the detection signal output from this fire detection unit, the preset fire discrimination level, and the predetermined overlevel exceeding this fire discrimination level are compared, and whether the detection signal exceeds these levels. Based on the comparison determination unit that determines whether or not the detection signal exceeds the fire determination level, the first fire signal is output when the detection signal exceeds the fire determination level, and a predetermined pause time after that is set. After a lapse of time, the detection signal from the fire detection unit is fetched and compared and discriminated again by the comparison discrimination unit, and as a result, when the detection signal exceeds the fire discrimination level, the second fire signal is output. The signal processing unit compares the detection signal with the overlevel by the comparison determination unit after the first fire signal is output, and the detection signal does not exceed the overlevel. In this case, the pause time is set to a time longer than the initial value, while if the detection signal at this time exceeds the overlevel, the pause time is changed to a time shorter than the initial value. Intelligent fire detector. 7. A fire detector that outputs a fire signal when the detection signal output according to smoke or environmental temperature exceeds a predetermined threshold, and outputs the detection signal according to smoke or environmental temperature. The fire detection unit, a comparison determination unit that compares the detection signal output from the fire detection unit with a preset fire determination level, and determines whether the detection signal exceeds the fire determination level; and the fire detection unit described above. The first fire signal when the detection signal exceeds the fire determination level according to the determination result of the comparison determination unit and the integration circuit that integrates the difference between the detection signal output from the unit and the fire determination level. Is output, and after a predetermined preset rest time has elapsed, the detection signal from the fire detection unit is fetched, and the comparison determination unit again compares and determines the detection signal to indicate the fire determination level. And a signal processing unit that outputs a second fire signal when the fire detection signal is exceeded, the signal processing unit further outputs the detection signal by the comparison determination unit after the first fire signal is output. An intelligent fire detector configured such that, when the discrimination level is exceeded, the rest time is set and changed according to an integral value obtained by integrating a difference between the detection signal and the fire discrimination level by the integration circuit for a predetermined time.