JPH0589379A - Environment abnormality detecting device and alarming device using the same - Google Patents

Abstract

PURPOSE:To surely detect the abnormality of fire, etc., at an early stage. CONSTITUTION:A reading part 2 fetches the level of a signal which is time- sequentially outputted from an analog sensor S, a comparing part 3 compares the level of the signal with the prescribed storage start level. An integration processing part 4 counts a storage value at the present point of time as the integration value as against the storage value till the one preceding point of time based on the comparison result and an abnormality detecting part 5 detects abnormality when the integration value obtained by the integration processing part 4 exceeds a prescribed threshold. An initializing part 6 initializes the storage value being as the integration value when the integration value obtained by the integration processing part 4 becomes the prescribed level which is set lower than the storage start level, for example, equal to below zero.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an environmental abnormality detecting device for detecting an analog amount of a phenomenon such as smoke, heat, gas and the like, and an abnormality device using the same.

[0002]

2. Description of the Related Art Generally, as a photoelectric smoke detector for detecting fire smoke, a light emitting and receiving circuit is pulse-driven to reduce power consumption and prevent malfunction due to noise or transient smoke.
A storage-type fire detector is known that outputs an operation signal for the first time when the smoke detection level is higher than or equal to a predetermined value and a predetermined number of times. There is a problem that it takes time to operate even when is at an extremely high level. In order to solve such a problem, an alarm is immediately issued when the analog signal is large, and a highly reliable environmental abnormality detection is performed without losing the accumulation effect. Therefore, as disclosed in Japanese Patent Publication No. 64-754, it has been heretofore known. Various environmental abnormality detection devices have been proposed.

This environmental abnormality detection device starts accumulation at a time when the level of an analog signal from an analog sensor such as a smoke sensor exceeds a predetermined level (accumulation start level) (specifically, counting by a counter). The counter value is continuously counted as the accumulated value during the period when the level of the analog signal exceeds the accumulation start level, and the alarm is issued when the accumulated value reaches a predetermined threshold value. At this time, as shown in FIG. 5, the threshold value is variably set according to the level of the analog signal. Specifically, the threshold value is set shorter as the level of the analog signal is higher. As a result, when the level of the analog signal is high, an alarm is issued even if the accumulated value is short, and a fire can be detected early.

[0004]

However, in the above-mentioned conventional environmental abnormality detecting device, once the level of the analog signal becomes lower than the predetermined level (accumulation start level), the accumulated value which has been counted up to now is cleared. Therefore, in the case of a photoelectric scattering type smoke sensor that quickly follows the density of smoke, when the density of smoke, that is, fluctuation occurs, the accumulated value is frequently cleared. Figure 6
6A and 6B are diagrams showing this state, and FIG.
As such, time after time average t _a level A of a detection result of smoke concentration analog signal, accumulation start level A _th of
Even in the above case, if the level A of the analog signal once drops below the accumulation start level A _th at time t _b due to the fluctuation of the level A of the analog signal due to the change in the density of smoke, as shown in FIG. 6B. the accumulated value CNT that has been counted from the time t _a would be cleared at time t _b before the threshold INT. As a result, the time t _a subsequent, even though the time average of the smoke density is constant level or higher, it is impossible to detect the abnormality such as a fire at an early stage, there is a disadvantage that it can not alert the early It was

The present invention prevents the occurrence of frequent clearing of the accumulated value due to the fluctuation of the phenomenon even when the sensor that quickly follows the change of the phenomenon such as smoke is used, and ensures the abnormality such as fire. It is an object of the present invention to provide an environmental abnormality detection device capable of early detection and an alarm device using the same.

[0006]

In order to achieve the above object, the present invention takes in the level of a signal output from a sensor in time series, and compares the level of the signal with a predetermined accumulation start level. Means, an integration processing means for counting the accumulated value at the present time as an integrated value with respect to the accumulated value up to the immediately preceding time point based on the comparison result obtained by the comparing means, and an integrated value obtained by the integrating processing means. An abnormality detection unit that detects an abnormality when the value exceeds a predetermined threshold, and an integration value obtained when the integration value obtained by the integration processing unit is equal to or lower than a predetermined level set lower than the accumulation start level. It is characterized by having an initialization means for initializing the accumulated value.

The comparison means gives a value proportional to the difference between the level of the signal output from the sensor and the accumulation start level to the integration processing means as a comparison result, and the integration processing means calculates the accumulation value at the present time by 1 It is characterized in that it counts as an integrated value of the result of adding the comparison result to the accumulated value up to the immediately preceding time point.

The alarm device of the present invention has at least one
Two sensors are connected, and the sensors are called repeatedly in sequence by polling, and by detecting the level of the signal output from the sensor, an abnormality is detected and an alarm is generated, and the signal output from the sensor is output. It is characterized in that the above-mentioned environmental abnormality detecting device is used to analyze the level of and detect an abnormality.

[0009]

In the environment abnormality detecting device having the above-mentioned structure, the level of the signal output from the sensor in time series is taken in, the level of the signal is compared with the predetermined accumulation start level, and the comparison result is obtained. Based on this, the accumulated value at the present time is counted as an integrated value with respect to the accumulated value up to the immediately preceding time point. When the integrated value obtained as a result exceeds a predetermined threshold value, it is detected as abnormal, and when the integrated value falls below a predetermined level set below the accumulation start level, the accumulated value as the integrated value is changed. initialize.

Further, a value proportional to the difference between the level of the signal output from the sensor and the accumulation start level is obtained as a comparison result, and the integrated value of the result obtained by adding the comparison result to the accumulated value up to the immediately preceding time point. As the accumulated value at the present time is counted, the accumulated value as the integrated value takes into consideration the magnitude of the level of the signal output from the sensor.

When the above-mentioned environmental abnormality detecting device is used as an alarm device, an alarm is issued when the integrated value exceeds a predetermined threshold and is detected as an abnormality.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of an embodiment of an environment abnormality detecting device according to the present invention. The environmental abnormality detection device 1 of FIG.
The polling cycle Δt _n (= t _n −t) of the analog sensor S
_n-1 ) and reads the level A (t _n ) of the analog signal output from the analog sensor S at time t _n , and the level A of the analog signal read at time t _n.
Based on the comparison result obtained by the comparison unit 3 that compares (t _n ) and the bias value A _th designated for the analog sensor S, the accumulated value up to the previous time t _n-1 Accumulated value CNT as an integrated value with respect to CNT (t _n-1 ).
The integration processing unit 4 for counting (t _n ), the abnormality detection unit 5 for detecting an abnormality when the integrated value CNT counted by the integration processing unit 4 exceeds a predetermined threshold INT, and the integration processing unit 4 for counting When the integrated value CNT (t _n ) thus calculated becomes equal to or smaller than a predetermined value (for example, a negative value), the accumulated value CN as the integrated value
And an initialization unit 6 for initializing T.

In such a configuration, the bias value A _th
Function as the accumulation start level, and the level A (t _n ) of the analog signal output from the sensor S is the accumulation start level A.
The counting of the accumulated value CNT (t _n ) is started from the time when it exceeds _th .

The comparison unit 3 compares the level A (t _n ) of the analog signal with the accumulation start level A _th ,
For example, and outputs the comparison result of these differences _{{A (t n) -A th} }.

Further, the integration processing section 4 is adapted to count the accumulated value CNT (t _n ) as an integrated value by the following equation, for example, based on the comparison result {A (t _n ) −A _th }.

[0016]

CNT (t _n ) = CNT (t _n-1 ) + {A (t _n ) −A _th } × Δt _n

As can be seen from equation 1, in this embodiment, the accumulated value CNT (t _n-1 ) up to the previous time t _n-1 is {A
Since (t _n) -A _th} are counted accumulation value CNT (t _n) at time t _n by adding × △ t _n, the higher the level A (t _n) of the analog signal at time t _n, The accumulated value CNT (t _n ) at time t _n greatly increases. That is, when a constant threshold INT as described below is set for the accumulated value, the accumulated value reaches the threshold INT early and the abnormality is detected early while the analog signal level continues to be high. If the signal level is not so high, the accumulated value does not reach the threshold value INT very early. As a result, the environmental abnormality detecting device 1 has a function substantially equivalent to the function disclosed in Japanese Patent Publication No. 64-754, that is, the function in which the threshold value for the accumulated value is variably set according to the level of the analog signal. You can give it to me.

Further, in this embodiment, the level A (t _n ) of the analog signal once falls below the accumulation start level A _th and the comparison result {A (t _n ) −A _th } becomes negative. Also, the accumulated value is not cleared unless the accumulated value CNT (t _n ) becomes negative. As a result, a photoelectric scattering smoke sensor or the like that quickly follows the smoke density is used as the analog sensor S, and the fluctuation level of the smoke contains a lot of fluctuation components in the analog signal level.
Even if (t _n ) frequently falls below the accumulation start level A _th , it is possible to effectively prevent the situation where the accumulated value is cleared frequently, and to detect an abnormality such as a fire early. Become.

FIG. 2 is a block diagram of an alarm device using the environmental abnormality detection device 1 shown in FIG. The alarm device includes a central processing unit 21 for controlling the entire transmission to the central processing unit 21 Intafe - scan 22, a plurality of analog sensors S ₁ to S _K which is connected via a transmission line L, a central processing unit 21
The memory 23 for storing the processing result in FIG. 2 and the operation / display alarm unit 25 connected to the central processing unit 21 via the operation / display alarm interface 24.

Here, the central processing unit 21 has a function as the environmental abnormality detecting device 1 of FIG. 1, and when the central processing unit 21 is composed of a processor, the environmental abnormality detecting device 1 is a processor. It is realized by a software program that controls the operation. Further, the operation / display alarm unit 25 has a storage lamp LP for displaying this state during the period of counting the accumulated value, and also gives an alarm when the accumulated value becomes equal to or more than a predetermined threshold value. It has an alarm device ALM for issuing an alarm.

In the alarm device having such a configuration, a plurality of (for example, K) analog sensors S _{1 to} S _K are sequentially and repeatedly called by polling from the central processing unit 21 through the transmission interface 22, and each analog is called. Sensor S _i
(I = 1 to K), collecting analog information of fire environment parameters detected at each time t _n , that is, the level A _i (t _n ) of the analog signal, and analyzing the collected data. It makes a fire decision and issues an alarm when an abnormality such as a fire is detected.

Next, the operation of the alarm device of FIG. 2, particularly the operation of the central processing unit 21 (environmental abnormality detection device 1) will be described with reference to the flow charts of FIGS. 3A and 3B. In the following, the central processing unit 21 uses a constant polling period Δ.
At t _n , each analog sensor S _i (i = 1 to K) is polled, and each analog sensor S _i (i = 1 to K) has a predetermined bias value A _ith (i = 1 to K). It is specified. In addition, each analog sensor S _i (i
= 1 to K), the accumulated value CNT _i (t _n ) is counted. Prior to starting the actual operation,
The central processing unit 21 first executes the initialization routine (step S1) to clear the accumulated values CNT _{i and the} like. Further, the counter i for identifying the K analog sensors S _i (i = 1 to K) is initialized to “1” (step S2).

Next, for example, at time t _n , the analog sensor S _i is called by polling (step S3), and the level A _i (t _n ) of the analog signal output from the analog sensor S _i is read (step S4). In the present case,
Since the counter i is initially set to "1", the analog sensor S ₁ is called and the level A ₁ (t _n ) of the analog signal output from the analog sensor S ₁ is read.

Thereafter, in the central processing unit 21, it is determined whether or not the level A ₁ (t _n ) of the analog signal just read is larger than the bias value designated for the analog sensor S ₁ , that is, the accumulation start level A _1th . (Step S5), and if the level A ₁ (t _n ) of the analog signal is higher than the accumulation start level A _1th , the accumulation value is integrated in the increasing direction. That is, the accumulated value CNT ₁ (t _n ) is calculated according to the following equation as an integrated value with respect to the accumulated value CNT ₁ (t _n-1 ) up to the previous time t _n-1 (step S6).

[0025]

## EQU2 ## CNT ₁ (t _n ) = CNT ₁ (t _n-1 ) + | A ₁ (t _n ) −A _1th │ × Δt _n

As can be seen from Equation _1, when the accumulated value CNT ₁ (t _n-1 ) up to the previous time t _n-1 is "0", the counting of the accumulated value is newly started at the time t _n . It Further, when the accumulated value CNT ₁ (t _n-1 ) up to the previous time t _n-1 is not "0" but larger than "0", the time t _n is reached.
In, the accumulated value CNT up to the previous time t _n-1
1 (t _n-1 ) is further increased by | A ₁ (t _n ) −A _1th | × Δt _n , and the accumulated value is updated by integration.

Then, it is determined whether or not the accumulated value CNT ₁ (t _n ) at time t _n obtained by the equation 2 becomes _equal to or more than a predetermined threshold INT (step S7). As a result, when the threshold INT has not yet been reached, the central processing unit 21
Gives only a lighting instruction of the storage lamp LP to the operation / display alarm unit 25. As a result, the operation / display alarm unit 2
In step 5, the accumulation lamp LP is turned on to display that the accumulated value is currently being counted (step S8). It should be noted that the lighting instruction of the storage lamp LP is performed by the stored value CNT ₁ until the previous time t _{n- 1.}
It need only be performed when (t _n-1 ) is "0", and therefore the central processing unit 21 need only give an instruction to turn on the accumulation lamp LP only when newly counting the accumulated value. good. In this case, the accumulation lamp LP continues to be lit during the period of counting the accumulated value after starting the accumulation value counting unless there is an instruction to turn off the accumulation lamp LP.

On the other hand, in step S7, the accumulated value CN
When T ₁ (t _n ) becomes _{equal to} or greater than the threshold value INT, the central processing unit 21 detects this as an abnormality and instructs the operation / display alarm unit 25 to issue an alarm and an instruction to turn off the storage lamp LP. give. As a result, the operation / display alarm unit 25
Then, the alarm ALM outputs an alarm report such as a fire and turns off the storage lamp LP (step S9). It should be noted that the accumulated value CNT ₁ (t _n-1 ) up to the previous time t _n-1 is “0”, and the accumulated value CNT ₁ (t _n ) of the very large level A ₁ (t _n ) is reached at the time t _n when the accumulation value counting is started. An analog signal occurs,
When the accumulated value CNT ₁ (t _n ) becomes _{equal to} or greater than the threshold value INT, the accumulation lamp LP has been in the extinguished state before that, so it is not necessary to extinguish the accumulation lamp LP and only an alarm is issued. It

In this way, the analog signal level A
When it is determined that ₁ (t _n ) is larger than the accumulation start level A _1th , integration is performed in the direction of increasing the accumulation value, but in step S5, the analog signal level A
When it is determined that ₁ (t _n ) is smaller than the accumulation start level A _1th , integration is performed in the direction of decreasing the accumulated value. Prior to this, it is judged whether or not the accumulated value CNT ₁ (t _n ) up to the previous time t _n−1 is larger than “0” (step S10), and this is not larger than “0”. Sometimes integration processing is not performed. Accumulated value CNT
_{When 1} (t _n-1 ) is larger than “0”, the accumulated value CNT ₁ (t _n ) is integrated with the accumulated value CNT ₁ (t _n-1 ) at the previous time t _n-1 . The value is calculated according to the following equation (step S11).

[0030]

CNT ₁ (t _n ) = CNT ₁ (t _n-1 ) − | A ₁ (t _n ) −A _1th | × Δt _n

That is, at time t _n , it is determined that the level A ₁ (t _n ) of the analog signal is lower than the accumulation start level A _1th , and the accumulated value CNT ₁ (t ₁ until the previous time t _n-1).
When _n-1) is larger than "0", the previous accumulated value CNT ₁ up to time t _n-1 and _{(t n-1) | A} 1 (t n) -A 1th |
The accumulated value is integrated and updated by subtracting xΔt _n .

As a result, it is judged whether or not the accumulated value CNT ₁ (t _n ) becomes negative (step S12), and only when it becomes negative, the accumulated value CNT ₁ (t _n ) is cleared to "0". Yes (step S13). In other words, even if the level A ₁ (t _n ) of the analog signal becomes smaller than the storage level A _{1th at} the time t _n , the storage value CNT ₁ (t _n ) obtained by _Equation 3 does not become negative. The accumulated value is not cleared.

In this way, at time t _n , the level A ₁ (t _n ) of the analog signal output from one analog sensor S ₁ is subjected to any one of the above processes, and then the next analog sensor S ₁ is processed. _Since the same processing is performed for the level A ₂ (t _n ) of the analog signal output from ₂ , the counter i is incremented by “1” (step S14), and the process returns to step S3 again and steps S3 to S13. Process.

After that, the levels A ₃ (t _n ) to A _K (t _n ) of the analog signals output from the analog sensors S _{3 to} S _K.
The same process is repeated for step S1.
5, when the counter i becomes larger than _K and the levels A ₁ (t _n ) to A _K (t _n ) of the analog signals output from all the analog sensors S _{1 to} S _K are processed. , Polling at time t _n ends. After that, the process returns to step S2 again, and at the next time t _{n + 1} , the analog signal levels A ₁ (t _{n + 1} ) to A _K (t _{n + 1} ) are output from the analog sensors S _{1 to} S _K. On the other hand, similar processing is sequentially performed.

FIG. 4 (a), (b) the level of one analog sensor, for example, analog signals output from the S _i A _i
It is a figure which shows the mode of the process with respect to. Analog sensor S
Level A _i of the analog signal diagram outputted from _i 4 (a)
If the accumulated value CNT _i is changed as shown in FIG.
It changes like (b). That is, the level A _i of the analog signal becomes accumulation start level A _{i @ th} or more at time t _a in FIG. 4 (a), the after count accumulated value CNT _i is started, the time t _b analog output level A _i is accumulated Even if the value of the analog signal once _falls below the start level A _ith , the accumulated value CNT _i is not reduced by the amount that the level A _{i of the} analog signal _falls below the accumulation start level A _ith. However, it is not cleared and the integral is updated.

FIGS. 4 (a) and 4 (b) are replaced with FIGS. 6 (a) and 6 (b).
Comparison if, Obviously, in the prior art, when the analog output level A _i once falls below the accumulation start level A _{i @ th} at time t _b, the accumulation value CNT _i is cleared, then the level of the analog signal A _i Is again _higher than the accumulation start level A _ith , the counting of the accumulated value CNT _i is started again at the time point t _c , but in the present embodiment, the analog signal level A _i at the time point t _b is the accumulation start level A _ith. Since the accumulated value is not cleared even if the accumulated value is once lowered below, the accumulated value CNT _i can reach the threshold INT earlier than in the conventional case. In other words, even when the time average of the analog signal level is equal to or higher than the accumulation start level A _ith , conventionally, the instantaneous value of the level A _i of the analog signal is frequently lowered to the accumulation start level A _ith or less. , Accumulated value C
The clearing of NT _i occurs frequently, and the accumulated value CNT _i does not reach the threshold value INT or does not reach the threshold value early even when it reaches the threshold value INT, so that an alarm report cannot be output early. In this embodiment, since the accumulated value CNT _i is not cleared frequently even when the level A _{j of the} analog signal frequently falls below the accumulation start level A _ith , the accumulated value C
The NT _i reaches the threshold value INT early, so that the alarm notification can be surely output early.

Further, in the above-described embodiment, the accumulation lamp LP is activated during the period from the start of counting the accumulated value until the alarm is issued.
Since it is turned on, it is possible that the operator may have an abnormality by seeing that the storage lamp LP is turned on even before the alarm is issued. You can know immediately.

[0038]

As described above, according to the environment abnormality detecting apparatus of the present invention, the level of the signal output from the sensor in time series is taken in and the level of the signal and the predetermined accumulation start level are calculated. Based on the comparison result, the accumulated value at the present time is counted as an integrated value with respect to the accumulated value up to the immediately preceding time point, and when the obtained integrated value exceeds a predetermined threshold, it is detected as an abnormality. When the integrated value becomes equal to or lower than a predetermined level set lower than the accumulation start level, the accumulated value as the integrated value is initialized. It is possible to effectively prevent a situation where the accumulated value is frequently cleared due to the fluctuation of the output level, and it is possible to reliably detect an abnormality such as a fire at an early stage.

Further, a value proportional to the difference between the level of the signal output from the sensor and the accumulation start level is obtained as a comparison result, and the integrated value of the result obtained by adding the comparison result to the accumulated value up to the immediately preceding time point. Since the accumulated value at the present time is counted as, the accumulated value as an integrated value also takes into consideration the magnitude of the level of the signal output from the sensor. If it is high, the accumulated value can be greatly increased accordingly, and an abnormality such as a fire can be detected reliably and earlier.

Further, by using the above-mentioned environmental abnormality detecting device as an alarm device, an alarm can be surely generated early.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of an environmental abnormality detection device according to the present invention.

FIG. 2 is a configuration diagram of an alarm device using the environmental abnormality detection device shown in FIG.

FIG. 3A is a flowchart for explaining the operation of the alarm device of FIG.

3B is a flowchart for explaining the operation of the alarm device of FIG.

FIG. 4A and FIG. 4B are views for explaining the state of the accumulated value counting process in the present invention.

FIG. 5 is a diagram showing a relationship between a level of an analog signal and a threshold value in a conventional environment abnormality detecting device.

6 (a) and 6 (b) are views for explaining the state of the accumulated value counting process in the conventional environment abnormality detecting device.

[Explanation of symbols]

1 environment abnormality detection device 2 reader 3 comparator section 4 integration processing unit 5 the abnormality detecting unit 6 initializes unit 21 central processing unit 22 transmission interface 23 memory 24 operation and display alarm interface 25 operation and display alarm section S ₁ to S _K analog Sensor

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tadashi Ito 1-11-6 Hatagaya, Shibuya-ku, Tokyo Nittan Co., Ltd. (72) Hideto Amamiya 1-11-6 Hatagaya, Shibuya-ku, Tokyo Nitsu Tan Co., Ltd.

Claims (3)

[Claims] 1. A comparison means for fetching a level of a signal output from a sensor in time series and comparing the level of the signal with a predetermined accumulation start level, and a current time based on a comparison result obtained by the comparison means. Integration processing means for counting the accumulated value at 1 as an integrated value for the accumulated value up to the immediately preceding time point, and abnormality detecting means for detecting an abnormality when the integrated value obtained by the integration processing means exceeds a predetermined threshold value. And an initialization unit that initializes the accumulated value as an integrated value when the integrated value obtained by the integration processing unit becomes equal to or lower than a predetermined level set lower than the accumulation start level. An environmental abnormality detection device characterized in that 2. The comparison means gives a value proportional to the difference between the level of the signal output from the sensor and the accumulation start level to the integration processing means as a comparison result, and the integration processing means calculates the current accumulation value. The environment abnormality detection device according to claim 1, wherein the accumulated value up to the immediately preceding time point is counted as an integrated value of a result obtained by adding the comparison result. 3. At least one sensor is connected, said sensor is sequentially and repeatedly called by polling, and an anomaly is detected and an alarm is generated by analyzing the level of the signal output from the sensor. An alarm device, wherein the alarm device uses the environmental abnormality detecting device according to claim 1 or 2 to analyze the level of a signal output from a sensor and detect an abnormality. Alarm device.