JPH08221674A - Analog sensor - Google Patents

Abstract

PURPOSE: To minimize error in characteristics by determining the center level of a 0-point level which fluctuates with a small memory capacity and to judge a fire without any time lag if the fire breaks out actually. CONSTITUTION: Sampling data (moving mean value AVE of plural live data) generated by converting detection outputs of physical quantities of smoke, heat, gas, etc., at every specific sampling period from analog to digital are held in a memory when they are within a specific 0-point level range. If the data are continuously in the 0-point level range for a constant time T wherein the sampling data are longer than the sampling period, the mean value of the sampling data in the time T is calculated and stored as output data. Further, when the sampling data are outside the 0-point level range, the sampling data are stored as output data as they are. The stored output data become response data to polling from a receiver.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an analog sensor of a fire monitoring system in which a receiver detects smoke density based on a sensor output (zero point level) in a smoke-free environment.

[0002]

2. Description of the Related Art Generally, for example, in an ion analog type smoke detector, the output of the smoke detector in a smoke-free environment, that is, a so-called 0-point level, is caused by the principle of the ionization type as shown in FIG. It fluctuates in the range of about 5%. Even photoelectric photoelectric smoke detectors are less stable than ion analog smoke detectors, but still staggering.

On the other hand, in a fire receiver to which an analog smoke detector is connected, the output level corresponding to the smoke density X shown in FIG. 12 is read by reading the 0-point level detected by each analog detector and the fire test value P. A linear equation of Y Y = aX + b is recognized in advance for each analog type sensor, and the conversion characteristic 1
The output level Y is converted to the smoke density X based on 00 to determine whether or not there is a fire every time the analog data is sampled.

Further, in the fire receiver, the detector is made to perform a fire test at every predetermined time, and a new conversion characteristic is recognized from the fire test value P which is analog data at that time and the 0-point level, and the influence of dirt or the like is recognized. I am trying to compensate.

[0005]

However, in such a fire monitoring system, since the output level Y of the analog type sensor fluctuates in a considerable range, when setting the characteristic, that is, the output data. (0 point level)
12 may be set in the range of characteristics 100 ′ to 100 ″ depending on the reading timing, and therefore, even if the sampled detection output Y is the same, it is converted to a different smoke density X depending on the set conversion characteristics. There was a problem that it would be done.

To solve this problem, moving average processing of a plurality of sampled detection outputs may be considered, but the fluctuation of the output level (0-point level) of the ion analog type smoke detector is as shown in FIG. It is clear from experiments that a small wobble and a large wobble are combined, and since it takes a relatively long time (40 seconds to 1 minute) to obtain the maximum value and the minimum value in the large wobble, for example, analog When performing the moving averaging process for T = 40 seconds with the sampling period of the data being 1 second, 40 pieces of data must be stored as the raw data, and therefore, a large capacity memory is required in the sensor. There is a problem that is required. Actually, not only the raw data but also the work area for calculation and the area for storing the calculation result are required in the memory.

In the moving averaging process, large fluctuation can be smoothed to some extent, but cannot be completely smoothed. Furthermore, if the time T for performing the moving average process is lengthened and the number of sampling points is increased, the rise in the average value obtained by the moving average process becomes slower than the smoke concentration that actually rises when a fire occurs, and the actual fire is detected. There is a problem of being late.

The present invention has been made in view of such conventional problems, and the error in the characteristic can be minimized by determining the center level of the wandering 0-point level with a small memory capacity. It is another object of the present invention to provide an analog sensor that can make a fire judgment without a time lag when an actual fire occurs.

[0009]

In order to achieve this object, an analog sensor according to the present invention comprises a detector for detecting a physical quantity of smoke, heat, gas, etc., and a detection output from the detector is converted into digital data. And an A / D converter for controlling the sampling data to be stored in the sampling data storage unit when the level of the sampling data obtained through the A / D conversion unit at a predetermined sampling cycle is within a predetermined 0-point level range. If the sampling data is continuously within the predetermined 0-point level range for the predetermined time T set longer than the sampling period, the sampling data for the predetermined time T stored in the sampling data storage unit is averaged. And a control unit that stores the calculated average value data in the output data storage unit as output data after a predetermined time T has passed. The features.

Further, the sampling data handled by the analog type sensor of the present invention is characterized in that it is a plurality of moving average value data of the sampling data obtained through the A / D converter at each sampling cycle. The sampling data storage unit of the present invention has a maximum value storage unit and a minimum value storage unit that store the maximum value and the minimum value of the sampling data, and the control unit outputs the sampling data for each sampling for a predetermined time T. Judge whether the maximum value stored in the maximum value storage unit or more or the minimum value stored in the minimum value storage unit or less, and if the maximum value or more, update the data in the maximum value storage unit to sampling data, The feature is that the data in the minimum value storage unit is updated to the sampling data when the value is less than or equal to the minimum value.

Further, the control unit of the present invention is characterized in that when the sampling data is out of the 0-point level range, the sampling data is stored in the output data storage unit as output data. Further, the control unit of the present invention is characterized in that the output data stored in the storage unit is sent to the receiver as a response signal by the polling call from the receiver.

Further, when the control unit of the present invention receives the periodic diagnostic signal from the receiver, the control unit forcibly outputs the output data stored in the output data storage unit at that time and the detection output from the detection unit. It is characterized in that the output data stored in the output data storage when the fire test adjustment circuit is driven to a predetermined level assuming a pseudo fire is transmitted to the receiver as a response signal.

[0013]

According to the analog type sensor of the present invention, when the level of the sampling data is within a predetermined zero point level range,
The sampling data is stored in the sampling data storage unit, and is stored in the sampling data storage unit when the sampling data is continuously within a predetermined 0 point level range for a predetermined time T set longer than the sampling period. By averaging the sampling data during the predetermined time T and using the calculated average value data as the output data after the lapse of the predetermined time T, the level of the output data is determined to be the center level of the detected output. Therefore, it is possible to minimize the error in recognizing the conversion characteristic between the output level and the physical quantity such as smoke density.

Further, by using the sampling data as a plurality of moving average value data of the sampling data,
The influence of noise or the like on the detection output can be removed. Further, during a predetermined time T, it is determined for each sampling whether the sampling data is equal to or more than the maximum value stored in the maximum value storage unit or less than the minimum value stored in the minimum value storage unit, In this case, the data in the maximum value storage unit is updated to the sampling data, and when the data is less than or equal to the minimum value, the data in the minimum value storage unit is updated to the sampling data, whereby the sampling data can be stored with a small memory capacity.

Further, when the sampling data is out of the 0-point level range, the sampling data is directly used as the output data, so that it is possible to make a fire judgment without a time lag during an actual fire.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a fire monitoring system equipped with an ion analog type smoke detector 16 as one example of the analog type detector according to the present invention. The transmission line 12 drawn from the receiver 10 includes an ON / OFF type sensor repeater 14, an ion analog smoke detector 16 according to the present invention, a photoelectric analog smoke sensor 18, a control repeater 20, and the like. The terminal is connected. The sensor line 2 from the sensor repeater 14
2 is drawn out, and on / off detectors 24-1, 24-2, ... And a transmitter 26 for outputting a fire signal by switch operation are connected to the detector line 22. Further, a control line 28 is drawn out from the control repeater 20, and a control load 30 such as a district bell or smoke proof equipment is connected to the control line 28.

A control unit 3 using a CPU in the receiver 10
2 is provided, and the control unit 32 has a display unit 34.
The operation unit 36 and the ringing unit 38 for outputting an alarm or a voice message are connected. In the control unit 32, a call control unit 3 and an interrupt processing unit 4 realized by a CPU program.
Also, a regular inspection section 5 and the like are provided. On the other hand, in each of the terminals 14, 16, 18 and 20, as represented by the sensor repeater 14, a call response section 6, an interrupt transmission section 7, a terminal control section for performing terminal drive, operation test, etc. 8 are provided.

A series of terminal addresses for the terminals 14, 16, 18, and 20 are preset in the call control unit 3 on the receiver 10 side. At the time of normal polling for collecting terminal information, the call control unit 3 sends a call signal including a terminal address and a call command to the transmission line 12, so that all terminals at regular intervals (for example, every 2-3 seconds). 14, 1
Call 6, 18, and 20 to send back terminal information. Also, the call control unit 3 transmits a control signal including a terminal address and a control command when controlling the terminals 14, 16, 18, and 20.

Here, as the control signal for the terminal,
The control signal including the control command for driving the control load 30 connected to the control repeater 20 and the sensor repeater 14 upon receiving the periodic inspection instruction from the periodic inspection unit 5 at regular intervals, and the ion analog. There is a control signal for an operation test for sending a test command by sequentially designating each address of the smoke sensor 16 and the photoelectric analog smoke sensor 18. In addition,
The operation test can be performed by arbitrarily selecting the terminal address.

The call signal or control signal from the call control unit 3 on the receiver 10 side is received by the call response unit 6 on each of the terminals 14, 16, 18 and 20, and the call address and the self-address included in the received signal are included. If the terminal addresses of are matched and match, if it is a call command, the terminal information held in the memory is transmitted to the receiver 10 as a terminal response signal. If it is a control command, a fire operation test or load drive is performed according to the command decoding result.

Next, referring to FIG. 2, the receiver 1 shown in FIG.
The call operation by polling in normal time performed between 0 and the terminals 14, 16 and 18 will be described. The receiver 10 intermittently transmits a calling signal including the calling command C1 and the terminal address Ai (i = 1 to 127) onto the transmission line 12, and each terminal 1
When the terminal address Ai coincides with its own address, 4, 16, 18 transmit the terminal response signal on the transmission line 12 until the transmission of the calling signal including the next terminal address Ai + 1.

The call signal from the receiver 10 is, as shown in detail in FIG. 3, an 8-bit command field, an address field and a checksum field, a parity bit added to each field, a head of each field and a parity. Each bit is composed of a start bit and a stop bit added after the bit. The terminal response signals from the terminals 14, 16 and 18 are shown in FIG.
As shown in detail in FIG. 1, each data field is composed of an 8-bit data field and a checksum field, a parity bit added to each field, and a start bit and a stop bit added after the head and parity bits of each field. There is. The value of the checksum field is the addition value of the value of the data field and its own terminal address Ai. Therefore, the receiver 10 recognizes the terminal address Ai by subtracting the value of the data field from the value of the checksum field. be able to. Of course, this transmission format is an example and can be appropriately configured.

Returning to FIG. 1, the call control unit 3 of the receiver 10 also sequentially receives all the terminals 14, 16 and 18 regardless of the terminal address Ai during a call by polling specifying the terminal address Ai. In order to sample each detection signal by AD conversion and hold it in the built-in memory to instruct collective information collection processing, for example, a sampling command (collective AD conversion command) is transmitted at a constant cycle of every one second.

On the other hand, when the call response unit 6 of each of the terminals 14, 16 and 18 determines the sampling command in the command field regardless of the address Ai, each terminal 1
The detection signals of the detectors 4, 16, and 18 are AD-converted and stored in the built-in memory. The terminal data collected all at once based on such a sampling command is transmitted to the receiver 10 as terminal response information to a calling signal by polling in which the terminal address Ai is designated. In addition,
The present invention is not limited to the collective data collection by such a sampling command, but the data when the calling signal is received may be returned in real time.

Interrupt transmission section 7 on the side of each terminal 14, 16 and 18
When, for example, a fire is detected from the detection data when the detection signal is sampled by AD conversion based on the sampling command from the call control unit on the receiver 10 side,
An interrupt signal for notifying the receiver 10 of the fire occurrence is transmitted using the terminal response timing. Usually the receiver 10
From each terminal 14, 16, 18 is sent in voltage mode, while the response signal from each terminal 14, 16, 18 to receiver 10 is sent in current mode.
Therefore, the interrupt transmitter 7 uses the break signal, which destroys the response signal transmitted from any one of the terminals 14, 16, and 18 at the timing of the terminal response signal, as the current signal, to the transmission line 1.
2 to send an interrupt signal.

An interrupt processing unit 4 is provided in the control unit 32 of the receiver 10 for the interrupt transmitting unit 7 on the side of each of the terminals 14, 16 and 18. The interrupt processing unit 4 determines that an interrupt signal has been received from the terminal when it receives a peculiar signal that cannot be obtained from a normal terminal response signal, for example, an all-1 signal, based only on the timing of the terminal response signal. When the interrupt processing unit 4 determines that an interrupt signal is received from the terminal, it causes the call control unit 3 to transmit an interrupt confirmation request command in order to obtain the details of the interrupt cause.

In response to this interrupt confirmation request command, the terminal 1
The call response unit 6 on the side of 4, 16 and 18 sends back the detailed interrupt information. The interrupt processing unit 4 which has obtained the detailed interrupt information via the call control unit 3 transmits the interrupt signal to the terminals 14, 16 and 1.
A group search for specifying 8 is started. In this group search, the terminal address is divided into a predetermined number of groups, the search command is sent to each group to identify the group to which the terminal where the fire detection was performed belongs, and if the group can be identified, the terminals in that group are identified. Are called sequentially,
Identify the terminal where the fire was detected. Note that this group search may be performed by the dichotomy method instead.

Next, the ion analog smoke detector 16 according to the present invention will be described in detail with reference to FIG. FIG.
The transmission line 12 shown in is connected to the rectifier circuit 41 for making the connection polarity nonpolar, and the 10V constant voltage circuit 43, the transmission signal detection circuit 48, and the response signal output are connected to the rectifier circuit 41 and the noise absorption circuit 42. The circuit 49 is connected.
The 10V output voltage of the 10V constant voltage circuit 43 is applied to the amplifier circuit 44, the series circuit of the resistor R and the FET 46, the ion type smoke detector 47, the capacitor C and the 3V constant voltage circuit 50.

The smoke detecting section 47 is composed of an internal electrode 47a having a radiation source, an intermediate electrode 47b and an external electrode 47c, and a voltage of 10V is applied between the internal electrode 47a and the external electrode 47c to cause an ionic current to flow. ing. Also, FE
A voltage of 10 V is applied to the source S of T46, the intermediate electrode 47b is connected to the gate G, and the drain D is grounded.

In this structure, when smoke particles flow between the external electrode 47c and the intermediate electrode 47b, the FET 46
The voltage between the source S and the drain D of is changed, this voltage is amplified by the amplifier circuit 44, and this detection output is taken in by the MPU (microprocessor) 52 as smoke density data. Further, when a fire test command is received from the receiver 10, a predetermined fire test voltage P (see FIG. 11) is applied from the fire test adjustment circuit 45 to the amplifier circuit 45 by the control of the MPU 52 and is taken in by the MPU 52.

The transmission signal detection circuit 48 detects a calling signal in the voltage mode from the receiver 10 and sends it to the MPU 52 via the interface circuit 51, and the response signal output circuit 49 inputs it from the MPU 52 via the interface circuit 51. The response signal is sent to the receiver 10 in the current mode. The 3V constant voltage circuit 50 is the same as the 10V constant voltage circuit 43.
A power supply voltage of 3V is generated based on the output voltage of V and is supplied to the interface circuit 51, the MPU 52, the address / type setting circuit 53, and the voltage detection circuit 54.

The MPU 52 has a CPU 52a for realizing each function of the call response unit 6, the interrupt transmission unit 7 and the terminal control unit 8 for performing an operation test, a ROM 52b in which a program of the CPU 52a is stored in advance, and a CPU 52a. A RAM 52c having a work area, in particular, an area for storing data as shown in FIG. 6, and an A / D converter for converting the output voltage of the amplifier circuit 44 into a full scale of 3V to capture smoke density data as digital data. A
It has a / D converter 52d.

As shown in FIG. 6, the RAM 52c has four smoke density detection data (raw data) D1 to D4, and four thereof.
The moving average value AVE of the two raw data and the maximum value MAX and the minimum value MI of the moving average value within the range of the 0-point level described later.
N and an area for storing output data transmitted to the receiver 10. Of the raw data D1 to D4, the data D4 is the newest, and the oldest data is erased by shifting for each sampling. These data are updated for each batch A / D conversion command from the receiver 10, and the output data is for each call command in the receiver 1.
Sent to 0.

Here, the ion analog type smoke detector 1 shown in FIG. 5 is used.
The basic operation of No. 6 will be described with reference to FIG. FIG. 7 is a moving average value AV in the ion analog type smoke detector of FIG.
The time change of E is shown. The A / D converter 52d of the MPU 52 shown in FIG.
Each time a D conversion command (sampling command) is received and decoded, the output voltage obtained through the amplifier circuit 44 at that time is A / D converted and fetched as detection data. This becomes the raw data, and every time the raw data is obtained, the moving average value AVE of the four raw data is obtained and stored in the RAM 52c. FIG. 7 plots the time change of the moving average value AVE.

In the normal monitoring state, smoke does not flow in due to fire, so the smoke density is 0 [% / m], but in reality the raw data fluctuates as shown in FIG. The moving average value AVE also fluctuates as shown in FIG. For this 0 point level, the 0 point level range is set by setting the 0 point level MAX value and the 0 point level MIN value.

The 0-point level range is set slightly wider than the fluctuation range of the detection data. The fluctuation range is
Since it depends on the detection principle, it is desirable to set it according to the detection principle. That is, the ion analog type smoke sensor 18 is used in this embodiment, but other analog type sensor may be used. The ion analog type smoke sensor 18 sets a predetermined time period T longer than the sampling period, for example, periods T1, T2, T3 ... Having T = 40 seconds, depending on the large fluctuation period of the detection data. ing. During this time period T, if the moving average value AVE is continuously within the 0-point level range, after the time period T has elapsed, the average value of the moving average values AVE up to then is calculated, and this average value is calculated. It is stored in the output data area of the RAM 52 as output data in the subsequent time period T.

In the embodiment, the moving average value A for the time period T
In order to reduce the capacity of the memory for storing VE and to simplify the average calculation for obtaining the output data, only the maximum value MAX and the minimum value MIN of the moving average value AVE within the time period T are held and the average thereof is held. Calculation is performed to obtain output data. That is, every time the moving average value AVE is calculated, it is compared with the stored data of the maximum value MAX and the minimum value MIN.
If the data is less than the minimum value MIN, the moving average value AVE is updated.

If the RAM 52c has a margin, the time T
All moving average values AVE for minutes may be stored and the average value of all stored data may be obtained. Cycles T1 and T2 in FIG.
During the period, all the plotted moving average values AVE are 0.
Since it is within the point level range, the time period T of the moving average value AVE stored in the output data area of the RAM 52c is responded to by the polling call from the receiver 10.
The average value within is returned as output data. Specifically, at time t2 at the end of the cycle T2, the moving average value AVE was continuously within the 0-point level range during the cycle T2, and therefore, the average value of the maximum value MAX and the minimum value MIN of the RAM 52c is calculated. The calculated value is stored in the output data area and used as the output data in the subsequent cycle T3.

Even when the receiver 10 sends a regular diagnostic signal (fire test command) to correct the output characteristic, the output data stored in the output data area of the RAM 52c when the fire test is performed is performed. , Send it back. On the other hand, it is assumed that the moving average value AVE exceeds the 0-point level MAX value due to a fire at time t3 in the middle of the next cycle T3. In this case, the moving average value A exceeding the 0-point level MAX value
The VE itself is stored in the output data area of the RAM 52c. Therefore, the moving average value AVE is returned as it is to the call from the receiver 10 by polling.

As described above, the ion analog smoke sensor 18 according to the present invention obtains the moving average value AVE from the raw data even if the zero level has an inherent fluctuation depending on the detection principle, and the time T depending on the fluctuation cycle. Since the average value of the moving average values between the two is obtained and this is the 0 point level, the 0 point level can be set as the center level of the staggered detection output, and a stable 0 point level can be obtained. it can.

Next, the basic operation of the receiver 10 of FIG. 1 will be described. Normally, when the receiver 10 calls the ion analog smoke detector 18 by polling, the output data stored in the output data area of the RAM 52c, which is the output data storage unit of FIG. 5, is returned, and the output data is output according to the conversion characteristic. Are converted into physical quantities such as smoke density. If the output data returned at this time is less than or equal to the 0 point level range in FIG. 7, that is, less than or equal to the 0 point level minimum value MIN, it is judged as abnormal and a sensor failure is notified. Therefore, the 0-point level MAX value and the 0-point level MIN value that determine the 0-point level range in FIG.
You will also have 0.

The receiver 10 also carries out a periodic diagnosis process by the regular inspection section 5. As the regular diagnosis processing, the 0 point level and the fire test value P by the fire operation test are obtained, and the conversion characteristic for obtaining the smoke density from the output level Y is corrected, and there are three types of modes 1 to 3. Periodic diagnosis process of mode 1; the receiver 10 sets the ion analog type smoke detector 1 at predetermined intervals, for example, once a week.
A regular diagnostic signal (fire test command) is transmitted to 8. Output data (0 point level) stored in the RAM 52c at that time from the ion analog type smoke sensor 18.
And the output data (fire test value P) when the fire test adjusting circuit 45 is driven to force the detection output of the smoke detection unit 47 to a predetermined level assuming a pseudo fire.

The receiver 10 sets new conversion characteristics from the returned 0-point level and the fire test value P (correction of conversion characteristics). At this time, if the 0-point level is out of the 0-point level range in FIG. 7, it is determined that the 0-point level is abnormal, and the sensor failure is notified without correcting the conversion characteristic. Periodic Diagnosis Process of Mode 2 The receiver 10 transmits a periodic diagnosis signal (fire test command) to the ion analog smoke detector 18 at predetermined intervals, for example, once a week. Ion analog type smoke detector 1
From FIG. 8, only the output data (fire test value P) when the fire test adjustment circuit 45 that drives the detection output of the smoke detector 47 to a predetermined level forcibly assuming a pseudo fire is returned. The receiver 10 sets a new conversion characteristic from the fire test value P returned in response to the periodic diagnostic signal and the output data returned at the previous polling, that is, the 0-point level.

At this time, 0 obtained in the previous polling
If the point data is outside the 0 point level range in FIG. 7, it is determined that the 0 point level is abnormal and new conversion characteristics are not set, and a sensor failure is notified. This mode 2
The process of returns only the fire test value P in response to the periodic diagnostic signal (fire test command), and does not return the 0-point level, but uses the one obtained in the previous polling.
Data transfer from the sensor side can be simplified.

Periodic Diagnosis Process of Mode 3 The receiver 10 outputs data which is returned from the ion analog smoke detector 18 at a predetermined period shorter than the periodic diagnosis period, for example, once a day by calling by polling. Using the point level and the fire test value P returned by transmitting a periodic diagnostic signal (fire test command) to the ion analog smoke detector 18 for a predetermined period, for example, once a week, Set the conversion characteristics.

At this time, 0 obtained in the previous polling
If the point level is out of the range of the 0 point level in FIG. 7, it is determined that the 0 point level is abnormal and a new conversion characteristic is not set, and a sensor failure is notified. This mode 3
In the processing of 1, the conversion characteristic is corrected, for example, once a day, which is shorter than the transmission cycle of the regular diagnostic signal (fire test command). In the correction in this case, a new conversion characteristic is set once a day from the 0-point level obtained by polling with the fire test value P as it is. Correction of the conversion characteristic by the fire test value P and the 0 point level when the fire operation test of the sensor is performed is once a week. Therefore, the conversion characteristics are finely corrected, and the reliability can be further improved.

The mode of the periodic diagnosis process for setting the conversion characteristic is appropriately selected and set depending on the system compatibility. Next, the operation of the MPU 52 will be described with reference to the flowcharts of FIGS. It should be noted that the receiver 10 sends the A / D conversion command to the terminals 14, 16, 18 and 20 every 1 second, and the polling cycle for all terminals is 2 to 3 seconds depending on the number of terminals, and the control command is 1 second. The periodic diagnosis command including the fire test command is transmitted every one week. Further, a load drive control command for the control repeater 20 is transmitted as necessary. The regular diagnostic mode is a mode 1 in which the fire test value P and 0-level data are returned in response to a fire test command as a regular diagnostic signal.
Is taken as an example.

In FIG. 8, first, when power is turned on, initialization is performed in step S1, and then in step S2, a signal waiting state is entered. In this state, the presence or absence of signal reception is monitored and received. If so, it is determined in step S3 whether the received signal is an AD conversion command (sampling command). If an AD conversion command (sampling command) is determined, the process proceeds from step S3 to step S11.

On the other hand, when the call command is determined in step S4, the process proceeds from step S4 to step S9 and thereafter, and in step S5, it is determined whether the terminal address in the signal coincides with its own address. When the control command is received in step S6, the process proceeds to step S6. The control command is a fire test command in the periodic diagnosis command, and a fire test command is used, or the control repeater 20 shown in FIG.
Is a command for driving the load 30, and in this case, as shown in FIG. 9, when the terminals 14, 16, 18, 20 receive the control command, a response command is returned to the receiver 10. When the receiver 10 receives the response command and determines that the control can be performed, the receiver 10 returns a confirmation command, and the terminals 14, 16, 18, and 20 confirm the confirmation (AC
K) When the command is received, control such as an actual fire test is executed in step S7.

Here, when the regular diagnostic command including the fire test command is transmitted from the receiver 10 in a cycle of one week, the fire test adjustment circuit 45 shown in FIG. 5 is driven, and the output data (fire test The value P) and the output data (zero point level) in the normal state are returned to the receiver 10 in step S8. If the control command cannot be determined in step S6, the process proceeds to step S8, and the output data stored in the RAM 52c is transmitted to the receiver 1 as terminal response information. When the call command within the polling is received in step S4, it is determined whether or not the fire bit is on in step S9, and if it is on, step S10 is executed.
Then, an interrupt signal is transmitted at the transmission timing of the terminal response signal, and the process returns to step S2. If the fire bit is off, the process proceeds to step S5.

When an A / D conversion command is received in step S3, step S1 shown in detail in FIG.
The A / D conversion command analysis process of No. 1 is executed, and then it is determined whether the sampling data is at the fire level or higher in step S1
If the fire level or higher is determined in step 2, step S13
Then, the fire bit is set and the process returns to step S2. Also,
If the sampling data is not higher than the fire level in step S12, the process directly returns to step S2.

Next, the A / D conversion command analysis processing will be described in detail with reference to FIG. As described above, when the A / D conversion command is received, this process is executed, for example, in a cycle of 1 second. First, the amplification circuit 44 and the A / D converter 5
Smoke density detection data (raw data) obtained via 2d
D4 is fetched in step 21 and stored. Here, the previous three raw data D1 to D3 shown in FIG.
And the area of the raw data D4 is vacant.

Next, in step S22, a counter T that counts a time period T for taking in sampling data, for example, T = 40 seconds is started, or if the counter T has already started, it is incremented and generated in the next step S23. The moving average value AVE of the data D1 to D4 is calculated and stored as sampling data. In a succeeding step S24, it is determined whether or not the moving average value AVE is within the 0-point level range in FIG. 7, and if it is within the range, the step S24 is executed.
25 or less, and if not within the range, step S33
Branch to. In step S25, it is determined whether the moving average value AVE is greater than or equal to the maximum value MAX and the minimum value MIN that are already stored. If it is greater than or equal to the maximum value MAX or less than or equal to the minimum value MIN, the moving average value AVE is moved. The data of the maximum value MAX or the minimum value MIN is updated with the data of the average value AVE.

Then, in step S26, the moving average value AVE is set to a predetermined value 0 in the previous A / D conversion command analysis processing.
It is determined whether or not a flag indicating that the point level is out of range is turned on. If the flag is off, it is determined in step S27 whether or not the value of the counter T has passed 40 seconds, and 40
If the second has not elapsed, the process directly goes to step S32 to shift the raw data D1 to D4 to make the area of the raw data D4 empty, and then to step S12 shown in FIG.

In step S27, the counter T
If it is determined that the value of 40 seconds has passed, step S
An average value is calculated by the arithmetic expression (maximum value MAX + minimum value MIN) / 2 in 30 and stored in the output data area as output data. In the next step S31, the counter T and the maximum value M are stored.
The data of AX and the minimum value MIN is cleared, and step S
Proceed to 32.

When the flag is turned on in step S26, that is, when the moving average value AVE is outside the predetermined 0-point level range in the previous A / D conversion command analysis processing, the value of the counter T is 40 seconds in step S28. It is determined whether or not it has elapsed, and if 40 seconds have not elapsed, the data of the moving average value AVE is stored in the output data area as output data in step S35, and the process proceeds to step S32. Further, in step S28, the value of the counter T is 40
If it is determined that the second has elapsed, the flag is turned off in step S29 and the process proceeds to step S30.

In step S24, the moving average value AVE
When it is determined that is outside the predetermined 0-point level range, the process proceeds to step S33 to clear the data of the counter T, the maximum value MAX and the minimum value MIN, then the flag is turned on in step S34, and the process proceeds to step S35. Moving average value A
The VE data is stored in the output data area as output data, and the process proceeds to step S32. In this case, the moving average value AVE is returned as output data in response to polling.

In the above embodiment, the receiver sets the conversion characteristic from the output level to the smoke density, but the conversion characteristic is set in the analog type sensor itself and detected by the sensor itself. The level may be converted into a physical quantity such as smoke density, and the converted value may be transmitted to the receiver. Further, the detector may judge the fire from the converted value and transmit the result to the receiver. The correction process for newly setting the conversion characteristic by the analog sensor itself may be performed periodically by the sensor itself or may be performed by a periodic diagnostic signal from the receiver.

[0059]

As described above, in the analog smoke detector of the present invention, the level of sampling data is 0.
When it is within the point level range, the sampling data is stored in the sampling data storage unit, and the sampling data is set for a predetermined time T longer than the sampling period.
For a continuous period of time within a predetermined 0 point level range,
By sampling and averaging the sampling data during the predetermined time T stored in the sampling data storage unit and using the calculated average value data as the output data after the lapse of the predetermined time T, the level of the output data fluctuates. Since it can be set as the central level of the detected output, the error in recognizing the conversion characteristic between the output level and the physical quantity such as smoke density can be minimized.

Further, by using the sampling data as a plurality of moving average value data of the sampling data,
The influence of noise or the like on the detection output can be removed. Further, during a predetermined time T, it is determined for each sampling whether the sampling data is equal to or more than the maximum value stored in the maximum value storage unit or less than the minimum value stored in the minimum value storage unit, In this case, the data in the maximum value storage unit is updated to the sampling data, and when the data is less than or equal to the minimum value, the data in the minimum value storage unit is updated to the sampling data, whereby the sampling data can be stored with a small memory capacity.

Further, when the sampling data is out of the 0-point level range, the sampling data is directly used as the output data, so that the fire can be judged without a time lag during the actual fire.

[Brief description of drawings]

FIG. 1 is a block diagram showing a fire monitoring system including an ion analog type smoke detector as an example of an analog sensor according to the present invention.

FIG. 2 is a timing chart showing a communication sequence at the time of calling between the receiver of FIG. 1 and terminals such as a repeater and a sensor.

FIG. 3 is an explanatory diagram showing a transmission format of the receiver of FIG.

FIG. 4 is an explanatory diagram showing a transmission format of the terminal of FIG.

5 is a detailed block diagram of the ion analog smoke detector of FIG.

6 is an explanatory diagram showing a storage area of the RAM of FIG.

7 is an explanatory diagram in which sampling data (moving average value) of the ion analog type smoke sensor of FIG. 5 is plotted with respect to time.

FIG. 8 is a flowchart for explaining a general operation of the ion analog type smoke detector of FIG.

FIG. 9 is an explanatory diagram showing a communication sequence when executing a control command in FIG.

FIG. 10 is a flowchart showing in detail the AD command analysis processing shown in FIG.

FIG. 11 is an explanatory diagram showing a zero point level fluctuation in a general ion analog type smoke detector.

FIG. 12 is an explanatory diagram showing sensor characteristics.

[Explanation of symbols]

 3: Call control unit 4: Interrupt control unit 5: Periodic inspection unit 6: Call response unit 7: Interrupt transmission unit 8: Terminal control unit 10: Receiver 12: Transmission path 14: Repeater for sensor 16: Ion analog Type smoke detector 18: photoelectric analog type smoke detector 20: control repeater 22: sensor line 24-1, 242-: on / off sensor 26: transmitter 28: control line 30: control load 32: control Part 34: Display part 36: Operation part 38: Sounding part 41: Rectifier circuit 42: Noise absorption circuit 43: 10V constant voltage circuit 44: Amplification circuit 45: Fire test adjustment circuit 46: FET 47: Smoke detection part 47a: Internal electrode 47b: Intermediate electrode 47b: External electrode 48: Transmission signal detection circuit 49: Response signal output circuit 50: 3V constant voltage circuit 51: Interface circuit 52: MPU 52a: CPU 52b: ROM 5 c: RAM 52d: A / D converter 53: Address Type setting circuit 54: voltage detection circuit C: capacitor R: resistor

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[Procedure amendment]

[Submission date] February 17, 1995

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] Figure 8

[Correction method] Change

[Correction content]

[Figure 8]

Claims (6)

[Claims] 1. A detection unit for detecting a physical quantity of smoke, heat, gas, etc., an A / D converter for converting a detection output from the detection unit into digital data, and the A / D for each predetermined sampling cycle. The sampling data is stored in the sampling data storage unit when the level of the sampling data obtained through the conversion unit is within a predetermined 0 point level range, and the sampling data is stored for a predetermined time T longer than the sampling period. When continuously within the predetermined 0-point level range, the sampling data stored in the sampling data storage unit during the predetermined time T is averaged and the calculated average value data is set to the predetermined value. An analog sensor, comprising: a control unit that stores the output data in the output data storage unit after the time T has elapsed. 2. The analog sensor according to claim 1, wherein the sampling data is a plurality of moving average value data of the sampling data obtained through the A / D converter at each sampling cycle. An analog sensor characterized by. 3. The analog sensor according to claim 1 or 2, wherein the sampling data storage unit has a maximum value storage unit and a minimum value storage unit for storing the maximum value and the minimum value of the sampling data. The control unit determines whether the sampling data is equal to or more than the maximum value stored in the maximum value storage unit or less than or equal to the minimum value stored in the minimum value storage unit for each sampling during the predetermined time T, and the maximum An analog sensor, wherein when the value is equal to or more than a value, the data in the maximum value storage unit is updated to the sampling data, and when the value is less than or equal to the minimum value, the data in the minimum value storage unit is updated to the sampling data. 4. The analog sensor according to claim 1, wherein the control section uses the sampling data as output data when the sampling data is out of the 0 point level range. An analog sensor characterized by being stored in an output data section. 5. The analog sensor according to any one of claims 1 to 4, wherein the control section outputs the output data stored in the output data storage section by calling by polling from the receiver, An analog sensor, which is transmitted to the receiver as a response signal. 6. The analog sensor according to any one of claims 1 to 4, wherein when the control section receives a periodic diagnostic signal from the receiver, the control section stores in the output data storage section at that time. The output data stored and the output data stored in the output data storage unit when the fire test adjustment circuit is driven to force the detection output from the detection unit to a predetermined level forcibly assuming a pseudo fire Is transmitted to the receiver as a response signal.