JPS5927395A - Alarm - 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] The present invention relates to an alarm device for fire, gas leak, etc.

This conventional loincloth alarm system includes a heat detector and a smoke detector.

The receiver receives sensing signals from gas detectors and the like when turned on and off, generates an alarm for the occurrence of a fire, etc., and displays the location where the fire has occurred. Since the determination of the occurrence of a fire or the like is made separately for each detection B based on the respective set threshold values, the threshold values must be determined in consideration of temperature changes, smoke concentration change ranges, etc. in normal times. For example, it is difficult to set a threshold value for a detector in a place where the smoke concentration changes widely during normal times, such as in a kitchen. i!
Since the sensitivity of the sensor changes depending on the temperature, atmospheric pressure, etc., there is a high risk of false alarms or missed alarms.

In order to solve this drawback, some alarm devices are designed to determine that an abnormality occurs when the amount of change in the detected value is above -stationary. Detection of change &J1, some are made to be performed individually on each sensor, detection III (lrI is received (transmitted to , recorded in the memory of the central processing unit on the receiver side, t, f, i
: 1. There is also a device configured to compare previously received data. However, it is dangerous to make a fire judgment only based on the change within 11 (1), and it is common to use it in conjunction with the above-mentioned threshold value.

Furthermore, the detection value of the detector is calculated annually, and the change in the detection value over time is stored in the memory of the central processing device H.
The current 4'a 1.11-sized pestle 1 (see the previous data stored in the mouth 1 above) +r<< +~ is also known as a device that makes a comprehensive fire judgment] 1. 〃To collect detected values from 11 detectors, A
l1) Assign an individual address to each terminal equipped with a converter, call each terminal cyclically by the address from the central processing unit 1 (C to It, tli), and call the called terminal. This can be done by a polling method in which the A/l') converter sends out detection data.

If it is stored dynamically, the current detected value can be referenced with the data that has not been stored. However, the memory capacity of the storage device has a limit of 1) 1K, and it is not possible to store past data indefinitely, so normally only 2 to 3
Only the past data for each session is saved, and the previous data is discarded. Therefore, in the above-mentioned conventional alarm device, since the past data can be used for only two to three times at most, it is not possible to take into account, for example, daily fluctuations in the detected value during normal times. In other words, it does not have sufficient functionality to meet the demand for minimizing false alarms.

An object of the present invention is to provide an alarm device that solves the above-mentioned conventional drawbacks, requires less memory, and enables time-series reference of detected values over a relatively long period of time in the past. There is a particular thing.

- The fire alarm system of the present invention connects all the transmission lines of a large number of terminal devices, assigns a unique address to each terminal device, and sequentially and cyclically reads each terminal device from the central processing unit. In the alarm device W, which is configured to send back the detected values of smoke concentration, hot water temperature, and gas concentration from each terminal by specifying an address, the detection data of each terminal is classified by time period. The central processing unit is equipped with a storage device having an area for storing values and minimum values respectively for a plurality of time periods, and the central processing unit stores the current detection data as the maximum value in the past same time period of the 1'Mfa terminal, I46 It is characterized by issuing an alarm by comparing the small value with a value obtained by multiplying a certain coefficient.

Next, the present invention will be explained in detail with reference to the drawings.

FIG. 3 is a diagram showing an example of a storage area of a storage device used in a first solid phase and an embodiment of the present invention. That is, N! corresponding to the unique address of each terminal. N7 (for example, 24) maximum value storage areas MAX and N7 (24) minimum value storage areas M1. It has N. For example, address i
The fifth maximum value storage area MAX of the address stores the maximum value I15 of the past detection value within the time period j of the corresponding terminal, and the minimum value storage area MIN stores the past detection value within the same time period j. The minimum ali of detected values is stored. Time zones 0-j-23 are, for example, divided into 24 time zones for 24 hours a day, and are divided into 24 time zones, 0:00-1:00 and 21:00-20, respectively.
Hours...corresponds to the time zone from 23:00 to 24:00. The present invention attempts to determine a fire by comparing the current detected value of each terminal with the maximum and minimum values stored in the storage device and in the same time period in the past, and It becomes possible to make accurate judgments by referring to past data.

FIG. 2 is a block diagram showing one embodiment of the present invention.

That is, the central processing unit fil connects the interface 2 . Transmission device 3. Sequentially and cyclically via the transmission line 4:': Each terminal Pi is outputted 1.1'-. The called terminal device returns the current detector output value as a quantum encoded digital value, and transmits it to the transmission device 3. 1. Input to the central processing unit 1 through the interface 2. Ru.

The central processing unit 1 reads out the maximum value corresponding to the current time zone of the called terminal device from the storage device 5 and calculates the constant coefficient K.
(≧1) and compare with the input value.

If the input value is a dog, it is determined that there is a fire, and the display/alarm device 7 is activated via the interface 6 to generate a fire alarm and display the location (terminal device address) of the fire alarm. If the input value is smaller, it is compared with the corresponding maximum value, and if the human input value is larger than the maximum value, the maximum value is rewritten. In other words, note 1. updates the contents of the corresponding most dog food storage area MAX of the device 5. If the input value is smaller than the maximum value, the above update is not performed.

Next, from the minimum value storage area MIN, extract the past minimum value fM of the corresponding time period, multiply it by a coefficient 1 (' (≦1), and compare it with the human-powered value. If the human-powered value is smaller, detect 1) If the device is determined to be malfunctioning, the malfunction display will be displayed. When the input value is thicker, a comparison is made with ``11'' and ``minimum Iho'', and if it is smaller than the minimum value, 31' the minimum value is recorded as g1. The above coefficient K
, K'kl, humidity according to 4>, li of each probe.

Wet ml,? It is set in consideration of fluctuations in the detector output that normally occur depending on the color tube, such as wind speed and wind speed. More-1
- to finish processing one terminal and start the next terminal.
Then, perform similar processing 42. 1- That is, by adding +1 to the address, all terminals are sequentially called.

All terminal calls are completed within, for example, 5 seconds; ~,
A fire alarm is issued within 5 seconds of the occurrence of a fire. After the first round, repeat the same v1 work again. Total number of calls N in one time period (for example, one hour).

is N,=t/α, where α is the time required for processing one terminal device (including transmission time). The central processing unit 1 stores the number of calls and increments it by -1 each time it finishes processing one terminal. Then, when Le reaches N, set Le to 1 again, j+1
=j as next time'! irK compatible memory device jiff
, 5 are read from the areas M A X and IVI IN and the same processing as described above is performed. Area MAX.

The number N of MIN for one terminal device is 24 in the case of Fig. 1, and when J exceeds N,
=1 and repeat the above operation. Area MAX, MIN
For example, 168 pieces of data N2 are required when data for a one-hour time period is to be stored outside of a week. However, since the storage capacity 1 of the storage device 5 is sufficiently large, there is no problem. In this case, it is desirable to transfer and store the maximum value and minimum value data of all the terminals in the time period all at once to the main memory of the central processing unit r71. In other words, it is sufficient that the main memory included in the central processing unit jf'i has a storage area twice as many as the number of terminals.

In the above example, the current data is compared with the candy obtained by multiplying the most dog sen and the smallest candy of the same time period in the past by a certain coefficient. It is possible to eliminate false alarms by comparing the detected values of terminals installed in the field with past results.

The detection value at the time of a fire outbreak is the maximum detection value for the same time period in the past, and there are changes due to other environmental conditions! The coefficient K f multiplied by Jil+ (if it exceeds it+, it is determined that it is a fire. In addition, if it exceeds the past maximum value and it is not determined as a fire, then the past maximum value will be updated. Because of this configuration, the maximum value in the storage device will always be data corresponding to the current situation.The same applies to updating the minimum value.

'Still, the storage device only stores the maximum and minimum values in each time period, so the number of time periods per terminal is 2
(with twice the storage area) is sufficient. In other words, with a small number of memory customers, it is possible to make a comprehensive judgment that takes into account all past conditions. The same applies to gas leak control equipment.

[Brief explanation of drawings]

11.1 is a diagram showing an example of a storage area of a storage device used in an embodiment of the present invention, and FIG. 2 is a block diagram showing an embodiment of the present invention. In the figure, 1...Central processing unit, 2.6...Interface, 3...Transmission device, 4...Transmission line, 5
...Storage device, 7...Display alarm device. Applicant: Nittan Co., Ltd. Agent, Patent Attorney: Toshimune H. (and 2 others)

Claims (1)

[Claims] (1) Connect Tayabu's terminal devices to the transmission line, assign a unique address to each terminal device, and send one address from the central processing unit.
The 7Cf reporting device is configured to specify the address of each terminal in an 11th cycle and return detection values such as smoke concentration, temperature, and gas concentration from each terminal. The central processing unit includes a storage device having an area for storing the maximum value and minimum value divided into 16 times for each time period, and the central processing unit stores the current detection data in the past same time period data of the terminal. (An alarm device characterized in that it issues an alarm by comparing the maximum value and minimum value in 4 with a value obtained by multiplying a certain coefficient. (2. In the alarm device according to claim 1) ,
On the right side of the central processing unit, the current detection data is
” Memories fi? ? If it is determined that it is a dog and that it is not a fire based on the maximum value of the past same time period read from the corresponding area, the data of the area is updated with the current detected data.