WO1984003976A1

WO1984003976A1 - Fire sensor apparatus

Info

Publication number: WO1984003976A1
Application number: PCT/JP1984/000146
Authority: WO
Inventors: Yoshiaki Okayama
Original assignee: Nohmi Bosai Kogyo Co Ltd
Priority date: 1983-03-31
Filing date: 1984-03-29
Publication date: 1984-10-11
Also published as: EP0148949A1; EP0148949A4; DE3484620D1; JPS59180694A; JPH0610837B2; EP0148949B1

Abstract

A fire sensor apparatus is provided with a fire sensor which has a built-in microcomputer and in which fire detection levels can be varied according to changes in environmental conditions (noise level) in the area in which it is installed. A signal from a sensor (1) is digitized in an A-D converter (3) and is input to a comparator (12). A CPU (5) determines the current time from a clock (4) and removes from a memory accumulated data on operating leveland noise level at the corresponding time in the past. The CPU (5) sets an operating level for the time concerned by executing a predetermined calculation, and compares this operating level with the signal from the sensor (1). An abnormal state is indicated at (14) or the accumulated data is renewed, according to the result of the comparison. Thus it is possible to set an appropriate operating level according to changes in noise level, and fire detection can be effected with a suitable detection sensitivity.

Description

Specification

Fire detector

The present invention relates to a fire detection device, in particular, a fire detection computer having a built-in computer for a fire mouth, and a fire detection level changes in response to a change in environmental conditions at an installation site, and a fire is always detected with an appropriate fire detection sensitivity. O The environmental conditions of the place where the fire detector is installed vary depending on time of day, day of the week or season. Considering this in a room in an office, when people enter and leave during the day and dust floats in the room, there is no person at night, so there is no dust inside the room. It is hardly floating, and even during the same day, the amount of floating-dust is naturally higher in times of high traffic such as going to work, leaving the office, and lunch than at other times. Also, during the working hours from Monday to Saturday, there is a lot of suspended dust in the commuting area, but on Sundays the amount of suspended dust is greatly reduced because there are few people entering and leaving the resort area. . If a smoke type fire detector such as an ionization type or a scattered light type operating at a smoke density of / 0 is installed in a place in such a commuting area as in the past, this fire detection is performed. The vessel operates almost smokeless at / 0 concentration because there is almost no airborne dust at night or on Sundays, whereas one OMPI runs from Monday to Saturday. In the daytime, a large amount of floating dust is present, and the amount of this floating dust corresponds to a number of smoke concentrations.

^ —It will actually operate with smoke of a certain concentration, and the smoke concentration at which the fire detector operates will differ between during the day and at night.

Considering the room temperature seasonally, in summer, the air conditioner operates during the daytime and the room temperature is around ° C, but at night the air conditioner is stopped and the room temperature rises to around 30 ° C. In winter, the room temperature is around 0 ° C due to the operation of the heating system in the daytime, but it drops to a low level at night due to the shutdown of the heating system. 7 to such a room. If a constant-temperature fire detector operating at C is installed, the room temperature should rise and fall around 0 during the summer nights before the fire detector operates, while Ί during the winter-season. Requires a rise of around 0 ° C.

In this way, conventional fire detectors with fixed fire detection sensitivity have a relative fire detection sensitivity that varies from time to time due to environmental conditions that change depending on the time zone, day of the week, and season of the installation location. It changes and it is not always possible to detect fires with a certain sensitivity, which may result in false alarms, late reports or unreported reports. The same applies to fire detectors that capture light, gas, and the like generated during a fire other than smoke and heat. Also, some conventional fire detectors have a measurement level of 乃至 to J and are used for switching. In this case, attach a timer device to the receiver, for example, during the daytime.

_ Οί¾ΡΙ In some cases, such as at night, the sensitivity is automatically switched by a command signal from the receiver so that the same sensitivity is always obtained, but the same level of sensitivity is always set. The environment in which the equipment is installed is various, and even if the sensitivity is set in advance, the sensitivity level may not always be the best, such as changing the use purpose of the installation location, changing the partition of the room, or the seasonal environment. If a large change is made, there are many problems such as correcting the setting of the sensitivity level each time. In view of these points, the present invention calculates the CPU in response to changes in the environmental conditions at the installation site, changes the fire detection level, and can always detect fire with appropriate fire detection sensitivity. The aim is to obtain a fire detection device that can be used.

For this reason, the fire detection device of the present invention has a built-in micro computer, and the micro computer periodically detects the physical quantity of a phenomenon similar to a fire phenomenon which is a noise component. Measured and stored as cumulative data, and based on the past stored data, the current expected environmental noise amount, for example, noise component, for each time zone or day time zone In this method, the sensitivity is determined to match the average value of this noise component, and the fire detection level is changed for each time zone so as to eliminate fluctuations in the fire detection sensitivity.

Next, the present invention will be specifically described with reference to the embodiment shown in the drawings.

First, Fig. 1 shows the basic configuration of the fire detector of the present invention. Since the configuration of the fire detector itself can be used arbitrarily in the block diagram, it can be used arbitrarily, so it is omitted in the figure, and the sensor part / and the amplifier for amplifying the output appropriately are described. To In the figure, / is a sensor that generates analog output by detecting a fire phenomenon such as heat, smoke, light or gas, or a change in temperature change dust similar to a fire phenomenon. = 2 is an amplifier that amplifies the output of the amplifier appropriately, = 2 is a sample-hold circuit that samples and holds the analog output, which is the output value of the amplifier, at predetermined time intervals, for example, << every 2 seconds. The A-to-D converter, which converts a pull-hold analog signal into a digital signal and reads it to the CPU, is the clock section, and ^ is the CPU, which is the heart of the micro computer. , _Έ ~? Is the / / ~ memory, / is

This is a signal sending circuit that outputs a fire signal under the control of CPUjr. Here, the assignment of one memory as one embodiment will be described. The first memory and the second memory are configured by ROM, and the control program is stored in the first memory. In the second 《2 memory 7, the fire discrimination level when no noise component is present is stored.The temporary reference level at the start is stored as the standard value. The data storage time and the reference value change time are stored in the memory. Again

The memory f and the memory No. are composed of RAM and used as temporary storage memory, respectively, and the memory J is the memory for storing the reference value which is the fire discrimination level. The memory is shown in Fig.

レ Ά OY.PI It shall be used as a memory for storing data by day and hour.

Next, Fig. 2 is a flow chart showing the operation explanation of Fig. 2 and the power supply voltage from the receiver or repeater through the power line or signal / power line to the fire detector. When supplied, the fire detector with the built-in micro computer starts its function.

The CPU starts its operation in the steps shown in Fig. 2 under the control program of the / th memory, and CPUi "is the / th step s / and the Jth memory. And the contents of the second memory, and set the initial values of the registers in the CPU.

Next, in step S «2 of the second = 2, the standard value is read from the second << ⁷ memory, and this standard value is stored in the ^ th memory for the standard value. Set to the reference value. As a result, the initial reference value of the fire detector, that is, the initial fire detection level is determined. If this fire detector is a smoke type and the sensor part / is an ionization type or a scattered light type, for example, the smoke becomes / 0 when dust is in the air. The standard value is set to / ^ so that the fire detector sometimes determines a fire o

Further, in step SJ of the?>, The CPU reads the output data of the sensor /, so that the CPU outputs the holding instruction to the sample hold circuit << 2. In addition, the sample hold circuit = 2 is supplied to the sensor section /

The output is sampled and held, and when the hold is completed, a hold signal is output to CP. CPUir is A-! ) A conversion instruction is output to the converter J, whereby the A-D converter J is a sample horned circuit. 2 converts the analog output signal of the sensor unit / that is held to a digital signal, and outputs a conversion end signal to the CPU when the conversion is completed. By the input of the conversion end signal, the CPU reads the output data of the sensor unit / converted from the AD converter J to the digital signal. '

Further, in the first step S, the CPU reads the reference value from the J-th memory, compares the reference value with the output data read in the previous J-th step S, and determines whether it is a fire. If the data is equal to or greater than the reference value, it is determined that a fire has occurred and the process proceeds to step ^ s, and if the data is a reference value, the status is determined to be normal and the process proceeds to step S *. I do. .

Thus, when going to the first step, the CP or the signal transmission circuit / h outputs a fire signal transmission command to the signal transmission circuit / h, and the signal transmission circuit / h outputs the fire signal to the receiver or repeater, etc.ο

When shifting to the first step S έ, the CPU reads the day of the week, time, etc. from the clock section, and the time is set to the second. 2 It is determined whether or not it matches the data storage time stored in the memory ⁷ . Happened nest STEP S ⁷ of the seventh if they match and that time, CP ϋ is a scan STEP S of the έ

-OMPI- The output data of the sensor unit read in the first step SJ is stored at a predetermined position in the memory によ based on the read day and time data. Note that it is the first memory? An example of storage in the memory is as shown in Fig. J. Is configured to be able to store weekly data every 2 hours on each day of the week, and if the current time is Monday at J hour, the data in the sensor section / It is stored in the / week part of the storage area at the time of J, and if all of this storage area from / week to week is filled at this time, the data of the week is cleared / weekly. The data for week J from the eyesight is shifted to / week, and the latest data is stored in / wk. The data is updated.

In the reading step S, the CPU reads the day and time from the clock section, and determines whether or not the time has reached the reference value change time stored in the second memory 7. Judge. In the second memory 7, for example, an even number time every two hours is stored as the reference value change time. In other words, the sensitivity is switched in an even number of hours, and ^ ~ is calculated based on the data at / hour, and ~ ~ is calculated based on the data at J hour.

Thus, if the reference value change time has been reached, in step S テ, C Ρ C stores the past accumulated data corresponding to the day and time read in step S f in step ヲ. Mori? Read from and calculate a new reference value. For example, if it's Monday, is it the second memory? Storage time on Monday

Ο ΡΓ

W1PO, Reads the past week's data from, and calculates the weekly average from the next K data read. This average value can be obtained by simple average calculation or weighted average calculation as needed, and the calculation result becomes the average value of the noise component in the past week. Next, a standard value is read from the second memory ⁷ , and an average value is added to the standard value to obtain a reference value for determining a fire in that time zone.

Finally, in step S / of step /, CPU i "stores the above-mentioned reference value obtained in step s? Of the previous step into memory s as a new reference value and stores the same as the new reference value. Return to step s J. Operate in such a loop · o

The function of this fire detector stops when the power supply from the power supply line or the signal / power supply line stops, and the CPU stops operating.

In the above description, the first value stored in the memory S as the reference value is the standard value (for example, / 0 ^) which is the fire detection level when the noise is. Alternatively, an initial setting value (for example, / 3 ^) that anticipates noise may be determined in advance, and this initial setting value may be stored in the J-th memory. When the sensor section / is a temperature sensor, for example, ⁷⁰ is set as the initial set value. C, for example, i "c can be selected as a standard value.

The data storage time and the reference value change time are the same as 時刻

(3MPI O

In addition, average values include simple averages and weighted averages.

The average value may be calculated from data excluding the minimum and maximum values from the accumulated data for calculating the average value, or the simple average or weighted average value is obtained by subtracting the minimum value from the maximum value. The value may be an average value by adding a value twice as much as the value.It is a constant.) Ο Next, Fig. 2 is a block diagram of another embodiment. When the power is turned on, the device starts operation by the control program stored in ROM /, and first stores the sensitivity set as a fire detector in RAM. That is, the upper limit set value, initial reference set value, and lower limit set value are

Because of the divided voltage of /, the CPU sequentially switches the input of the multiplexer / έ, and converts this analog signal to a digital signal by the Α-D converter J

Make RAM /, RAM »2, and RAM J each take note.

Also clears all the memory contents of the RAM containing the past accumulated data, and sets the maximum and minimum values of the past accumulated data.

Also clear the RAM containing the value and the average value, the RAM, and the contents of the memory.

Detected when these memories have been set and cleared.

The unit reads the output from the sensor unit /

Start picking. To continue the explanation, the sensor

The output of the section / end is amplified through an amplifier and is

The output value is held when one circuit = 2. This output is

'' ^ ijj. 0. The analog signal is converted to a digital signal by the A-D converter J via the multiplexer / that switches the set value of. When conversion is completed, a conversion end signal is output to the CPU. C receives the digital signal of A-D converter J as data and puts it into memory RAM for temporary storage. In this case, the CPU is RAM / RAM? Use / 0 memory of / and / ROM /. The CPU reads the current time and day of the week from the clock section, and reads data as data from the address corresponding to the current time and day of the memory HAM for accumulated data. If there is no accumulated data in the data, set the initial reference value more digitally. Send it as a signal to the rater /. If data f has accumulated data, the upper and lower limits of the operation level are read as data / and data J from RAM / and RAM J, respectively. The maximum value and the minimum value of the noise level of the environment are read as data and data from the RAM. And in the case of data two data

Digital comparator

Send to / as a signal. In the case of data, first, the upper limit (data /) and lower limit (data /) of the maximum noise width based on the maximum (data) and minimum (data) of the accumulated environmental noise. Data) and the ratio of the operating level to the allowable width

', One by one

(Calculate using _{A, A.} The result is assumed to be data / 0. Next, RAM «2, initial setting from RAM

O PI The fixed value and the average value of the past accumulated data are read as data and data, respectively, and the data is read. Calculate the current setting operation level using the formula of 2 + ^ X data / X (data one data). The result is designated as data, /. Note that? Is a constant. As a result, the current operation level can be obtained by the environmental noise predicted from the past accumulated data.

Therefore, the data // is given as a signal from the CPU to the digital data converter ⁰ data / 2. On the other hand A! ) Output of the converter for also maintaining a constant value while processing the C PU are latches, it compares the magnitude of the digital data le co down Ha ⁰ Correlator / Interview number here. A — If the data of the D converter J is larger than the data calculated by CP //, the output of the digital controller I «2 is higher than the output of H. The level becomes L, whereby the latch circuit / J operates and holds the level L. The latch circuit / J can be considered as a switching circuit, and the buzzer / can be considered as a receiver. In this case, the buzzer / 1 sounds and the abnormality is notified. Since the CPU has changed from a digital output to a data ⁰ / output power of <2, the output level has changed from S level H to level L, it is judged that the operation level has been exceeded, and data averaging and Does not process accumulated data, but continues reading data from / to the sensor. Reset switch RSW force When S is turned on, reset the latch circuit / J and release the latch. Note that when the output of the A-D converter falls below the sensitivity level, the output of the digital / nanocomparator / <2 returns to level H. Starts processing in memory at.

Digital connection. If the data remains unchanged, the CPTJ "determines that the operation level has not been reached, and replaces the data in the RAM? 7, and from the data received from the clock section, C Uj- determines whether or not it is the time to aggregate the data in the time zone, and if it is the aggregation time, averages the data in RAM? Then, the data 7 is read, and the data at a predetermined address in the RAM containing the past accumulated data corresponding to the current day of the week and the time is read, and the data s and the data 7 are read as, for example, /: «Perform weighted averaging at a rate of 2 and store as new accumulated data in the corresponding address of RAMf only if this result does not exceed the lower limit set value stored in RAM J o Exceeded If you have

Is stored.

Then, all data in the RAMS are checked, and the maximum value and the minimum value are stored in the RAM and the RAM, respectively. The ROM / stores the control program, the initial set values, the data aggregation time, and the like. In this way, the content of the past accumulated data changes with the passage of time, and the maximum and minimum values of the environmental noise fluctuate, so that depending on the environment in which the sensor is installed, The sensitivity level can be appropriately changed for each time zone. Figure 2 shows the memory map of CPTJ in Figure 1. Fig. 5 shows the main flow chart of the software used.

O PI

1PO Figures a to g show the subroutine flowchart. Figure a shows an example of an initial setting program, Figure ¾ shows an example of a sensor input reading program, Figure c shows an example of a time reading program, and Figure d shows an example of a time reading program. Figure e is an example of a fire operation program, Figure e is an example of a fire recovery program, Figure f is an example of a setting sensitivity calculation program, and Figure g is an example of a past cumulative data rewriting program. Finally, Fig. 3 shows an example of the lapse of time at the set level, Fig. 3A shows the conventional sensor, and Fig. 4 shows the case of the embodiment shown in Fig.

As described above, in the fire detector according to the present invention, the past accumulated data of the installed environmental noise is stored, and the current setting sensitivity is determined based on the stored cumulative noise. If the noise level is high, the sensitivity is reduced if the noise level is high, and the sensitivity is increased if the noise level is low. In this way, appropriate fire detection sensitivity can always be maintained.

BRIEF DESCRIPTION OF THE FIGURES

Fig. / Fig. Is a block diagram showing the basic configuration of the fire detector of the present invention. Fig. 2 is a flowchart for explaining the operation of Fig. / Fig. J is a block diagram of Fig. memory ? Is a simplified diagram showing the storage location of the storage device, Fig. Is a configuration diagram of another embodiment, Fig. Is a memory map of C Ρ in Fig., And Fig. Is a main software used. off b featurization tray, Fig. 7 a ~ _g are each subroutine full b featurization tray, the ^ Figure a, b the time set level in the invention of the prior art and this絰

Ο ΡΙ O is a diagram showing an example;

In the figure, / is the sensor section, 《2 is the sample hold circuit, J

Is A-D converter, is ^ meter, is CPU, PU, 7 are ROM

S,? Are RAM, / is signal transmission circuit, / is divided voltage resistor, / is multiplexer, / c2 is digital connector.

Rater, / J latch, RAM / ~ RAM9, R0M / memory.

― ΟΛ1ΡΪ ichi

, U

Claims

The scope of the claims

/ Smoke * heat << physical quantity measuring means for converting physical quantities of fire phenomena such as light into digital electric signals, means for storing the measured physical quantities, and means for creating past cumulative data using the same, and Means for determining the current setting sensitivity based on the accumulated data of the above, means for comparing and discriminating the setting sensitivity to be determined and the current input physical quantity, and means for outputting based on the result of the comparison discrimination. A fire detection device that features a fire detection level that changes in response to changes in the environmental conditions at the installation site, and that can always detect fire with constant fire sensitivity.

2. The fire detecting device according to claim 1, wherein the means for storing the measured physical quantity includes means for reading the measured physical quantity as information by day of the week and hour by means of a clock section.

«? · The means of determining the current setting sensitivity based on past accumulated data is based on the current expected environmental conditions, such as the average value, based on simple average calculation or weighted average calculation based on past accumulated data. The fire detecting device according to claim 11, further comprising means for determining a physical quantity according to the fire detecting device.

V: Measured physical quantity of a phenomenon similar to a fire phenomenon, that is, the fire discrimination level when no noise component is present as the standard value, and the fire detection level of the noise component that is judged to be a fire in contrast to this. Set as a reference value and calculate the average value of the noise component for each time zone or day time zone based on past accumulated data, and calculate the average value of the noise component as the standard value The fire detection device according to any one of claims / J or J, wherein the set sensitivity is determined as a reference value for judging a fire in the time zone by adding the following.

s. The means for determining the set sensitivity at 時点 1 based on the past accumulated data are the means for providing the upper limit set value and the lower limit set value of the operation level, the reference set value between the upper limit and the lower limit value, and the environmental noise. Means for calculating the maximum value, minimum value, and average value of the accumulated data from the accumulated data of the size, and the upper limit set value A, the reference set value B, the lower limit set value C, and the accumulated data maximum value D obtained by each of the above means. , The accumulated data average value E, the accumulated data minimum value F, and the accumulated data X corresponding to the current time among the accumulated data of the environmental noise.

B + '~) (X-E) (where ^ is a constant), and means for obtaining the current set sensitivity.