JPS62123596A - Environmental abnormality detector - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an environmental abnormality detection device that detects analog quantities of phenomena such as smoke, heat, gas, etc. and issues an alarm when an abnormality occurs.

"Prior art" The present applicant previously applied for patent application No. 23369 in 1982.
No. 2 (Japanese Unexamined Patent Publication No. 126798/1983), an accumulation means is provided which detects an analog quantity of a phenomenon such as smoke, heat, gas, etc. and changes the accumulation time λ in inverse proportion to the magnitude of this analog signal. A highly reliable environmental abnormality detection device has been proposed in which the time for determining an abnormality is changed depending on the degree of abnormality based on an analog quantity.

[Problems to be Solved by the Invention] The storage means shown in the prior art requires multiple storage circuits (counters) with different storage times, and also has the disadvantage that processing is complicated when carried out by a microcomputer. be.

"Means to Solve the Problem" This invention provides that when the analog signal of a sensor that detects all analog amounts of phenomena such as smoke, heat, gas, etc. is above a predetermined level,
Addition means is provided for adding the level exceeding this predetermined level, and subtracting the level below this predetermined level when the level is below the predetermined level, up to the limit that the accumulated value becomes zero. This is an environmental abnormality detection device that issues an alarm when the accumulated value of the means exceeds a predetermined value.

"Embodiment" Hereinafter, an embodiment of the environmental abnormality detection device of the present invention will be described in detail based on the drawings.

FIG. 1 is a block diagram showing an embodiment of the environmental abnormality detection device of the present invention. This environmental abnormality detection device includes a sensor 1 that detects analog amounts of phenomena such as smoke, heat, gas, etc. and converts them into electrical analog signals, and an A/D converter 2 that converts the output analog signals of the sensor 1 into digital signals. and a first comparison circuit 3 that compares the digital signal of the A/D converter 2 with the first comparison value P and outputs a digital signal of the difference level, and an output digital signal of the first comparison circuit 3. an adder circuit 4 that accumulates signals; a second comparator circuit 5 that compares the output accumulation value of the adder circuit 4 with a second comparison value Q and outputs a signal when the second comparison value is 9 or more; and a miscellaneous device 6 which is driven based on the output signal of the comparator circuit 5 of No. 2.

The operation of the environmental abnormality detection device of the present invention configured as described above will be explained based on the operation diagrams shown in FIGS. 2 and 3.

Sensor 1 detects phenomena such as smoke, heat, gas, etc. and generates electrical (
Z・ outputs analog signals (voltage, current).

This analog signal is converted into a digital signal by the A/D converter 2. A digital signal indicating the level of this phenomenon is compared with a first comparison value P indicating a predetermined reference level, and a digital signal X indicating the difference level is sent to the first comparison circuit 3.
outputs. FIG. 2 shows the state of the output obtained by converting the digital signal X into an analog value, which indicates the level of this difference. Second
As shown in the figure, the digital signal X takes a positive value when the level of the phenomenon is larger than the comparison value P, and takes a force value when it is smaller. This digital signal X is input to the adder circuit 4. These four adder circuits add the current addition value (accumulated value) and the digital signal X value. If the digital signal X is positive, normal addition is performed. If the digital signal X is negative, the digital signal X value (the level subtracted from the comparison value P) is subtracted from the added value, with the limit that the added value becomes zero. If the digital signal X value is considered as mathematically positive or negative, it can be considered as addition.

As shown in FIG. 3, the output addition signal Y of the adder circuit 4 is converted into an analog value, and the addition signal Y is zero in normal normal operation, and when the digital signal X value of the first comparator circuit 3 is positive. The addition signal Y is output. Even if there is an addition signal Y, if the digital signal X value subsequently becomes negative, the addition signal Y is subtracted, and if the digital signal X value continues to be negative, it becomes zero. Further, if the digital signal X value is positive and this state continues, the addition signal Y continues to increase. The addition signal Y is compared with the second comparison value Q by the second comparison circuit 5. Then, the second comparison circuit 5 outputs an alarm signal when the addition signal Y is larger than the second comparison value Q. In response to this alarm signal, the alarm device 6 is activated, and an indicator light, a buzzer, etc. are activated to notify that an abnormality has occurred.

As described above, the abnormality detection device of the present invention determines an environmental abnormality based on the accumulated values of analog quantities of phenomena such as smoke, heat, gas, etc., which are equal to or higher than the base value P.

Generally, the A/D converter 2, the first comparison circuit 3, the addition circuit 4, and the second comparison circuit 5 operate based on clock pulses of a predetermined period. In addition, the first comparison circuit 3 and the addition circuit 4
, the second comparison circuit 5 can be processed by a microcomputer.

In this case, it is easy to process signals from a plurality of sensors 1.

Next, an example of a program for processing by a microcomputer will be shown and explained. FIG. 4 is a flowchart showing an example of a processing program for processing signals from a plurality of sensors. Step S1 indicates the start when the power is turned on. Step 52Fi, an initialization routine for initializing buffers and the like. Step S3 sets a variable n indicating sensor /dress to 1. Step S4 takes in the analog value A ('n) of the nth sensor. In step S5, it is determined whether the captured analog value A (n) is equal to or larger than the first comparison value P. If YES, the process proceeds to step S6; if NO, the process proceeds to step S11. Step S6 changes the accumulated value B (n) of the buffer corresponding to this sensor to a new [B (
n) + A(n) - P ) value. In step S7, it is determined whether this new accumulated value B (n) has reached the second comparative value Q. If YES, the process proceeds to step S8; if NO, the process proceeds to step S9. Step S8
is an alarm processing program that outputs a signal to the alarm device to drive it. Step Sll determines whether the accumulated value B (n) before taking in the analog value A (n, ) is equal to or larger than CP-A (n)). YES
If NO in step S12, the process advances to step S13.

Step 812 converts the accumulated value B (n) into a new CB (n).
+A(n)-P] value. Step S13 is the accumulated value B
Set (n) to zero. Step S9 advances the variable n indicating the address of the sensor one step. In step 10, it is determined whether the variable n is greater than or equal to the final value N of the address, and YES is determined.
If so, the process returns to step S3 and the same process is performed starting from the first sensor. If No, the process returns to step S4 and proceeds to process the sensor at the next address. Analog value A of each sensor n (
The acquisition of n) is performed at predetermined intervals.

In this way, this processing program compares the analog value from the sensor with the predetermined first comparison l(iP and ratio l'!L
,, accumulate the exceeded level, and accumulate this (lH is 1-, the analog value is then the comparison value P of cylinder 1)) lower 1
F】J If you get a bad result, accumulate the corresponding level.・B(
When subtracted from n), the accumulated clear value B(n) becomes η22 (!i).If it becomes higher than Q, a KFJ report is issued.

"Effects of the Invention" As explained above, the environmental abnormality detection device of the present invention judges abnormality from the accumulated value that accumulates the level of the difference between the analog value from the sensor and the first comparison value. If the analog value is large, a warning is immediately issued, and if it slightly exceeds the comparison value, a judgment can be made without being affected by noise, so reliability can be increased.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the environmental anomaly detection device of the present invention, FIGS. 2 and 3 are explanatory diagrams explaining the operation of the environmental anomaly detection device of the present invention, and FIG. 4 is a block diagram of the device. 2 is a flowchart illustrating an example of a processing program when signal processing is performed by a computer. 1...Sensor, 2...A/D converter, 3...First
4... addition side path, 5... second comparison circuit, 6... alarm. Patent applicant Nittan Co., Ltd. Figure 1 Figure 2 11 Now Time Figure 3 11 Now Time t

Claims (1)

[Claims] A sensor that detects an analog amount of phenomena such as smoke, heat, gas, etc. and converts it into an electrical analog signal, an A/D converter that converts the analog signal of the sensor into a digital signal, and an A/D converter that converts the analog signal of the sensor into a digital signal. a first comparing means that outputs the level of the difference between the output and the first comparison value; and the output of the first comparing means is taken out at predetermined intervals, and when the output value is positive, the above level is added. and when the output value is negative, the accumulation value is limited to zero, and the addition means performs subtraction by the level;
It is characterized by comprising a second comparison means that outputs a signal when the accumulated value of the addition means exceeds a second comparison value, and an alarm that is driven based on the second comparison means. An environmental abnormality detection device.