JPH0792032A - Differential type thermal sensor - Google Patents

Abstract

PURPOSE:To reduce the capacity of a data storing area for temperature data by making the temperature data read at a relatively short time interval and a relatively long time interval, respectively, coexistent. CONSTITUTION:A data memory area is constituted of a first area [80 to 95] H, a second area [96-B3] H, and the like. The values of time counters cnt3, 12 are initialized, the ambient temperature is read every 3-second count value, and the temperature data of a RAM address [94-95] H is erased. The data Dx9 of the address [92 to 93] H is shifted as Dx10 thereto, the data Dx0 of the address [80 to 81] H is shifted as Dx1 to the address [82 to 83] H, and the present temperature data is thereafter stored as data Dx0. The cnt3 is reset, and when the value of the cnt12 is 12 seconds, the data Dx25 of the address [B2-B3] H is erased, and the data is successively carried and shifted to store the present data as Dx11 in the address [96 to 97] H. Since the temperature data at short and long time intervals are made coexistent, in this way, the capacity of the storing area can be made smaller.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a differential heat sensor for determining the presence or absence of a predetermined event such as a fire from the rate of temperature rise.

[0002]

2. Description of the Related Art As a fire detector for detecting the occurrence of a fire due to an increase in ambient temperature, there are a differential heat detector and a constant temperature heat detector. The differential heat sensor operates when the ambient temperature reaches a predetermined temperature increase rate or more, and the constant temperature heat sensor operates when the ambient temperature reaches a predetermined temperature or higher. Is.

In the conventional differential heat sensor, the air in the pressure-sensitive chamber having a very small leak hole expands or contracts according to the temperature change around the sensor, and the diaphragm accordingly. Was a mechanical mechanism that expanded and contracted to close the electrical contacts and actuate the sensor. However, even in the case of the differential heat sensor, the computerization is promoted, and the ambient temperature is sequentially read through the temperature sensor using the microcomputer, and the temperature data is stored in the storage area of the microcomputer. A differential heat sensor has been developed that calculates the rate of temperature rise (temperature difference / time) from the difference between the temperature data of and the temperature data of a predetermined time, and judges the presence or absence of a fire based on the temperature rise rate. ing.

In the conventional differential heat sensor using the microcomputer as described above, it is specifically determined whether or not a fire has occurred as follows. That is, as shown in FIG. 5, the RAM of the microcomputer
A data storage area [80 to FF] H is provided in the (random access memory) area [00 to FF] H, and a 0th RAM address [80 to 81] in the data storage area [80 to FF] H is provided. The current temperature data read this time is stored in H as temperature data D _X0 . Then, after a predetermined time T ₀ corresponding to a predetermined read cycle, the first temperature data D _X0 stored in the 0th RAM address [80 to 81] H is used as the first temperature data D _X1 before the predetermined time T ₀ . Shift to RAM address [82-83] H,
The newly read temperature data is stored in the 0th RAM address [80 to 81] H as the current temperature data D _X0 .

After that, the same operation is repeated every time the predetermined time T _{0 has} elapsed, and the 63rd RAM address [FE to FF].
The temperature data D _X63 stored in H is stored for a predetermined time T
₆₄ (however, T ₆₄ = T ₀ × 64) The temperature data D _X62 stored in the 62nd RAM address [FC to FD] H is discarded as the previous temperature data from the data storage area for a predetermined time T ₆₃ (however, T _{63 63} = T ₀ × 63) 63rd RAM address [FE to FF] as previous temperature data D _X63
Shift to H ........., 0th RAM address [8
0 to 81] H, the temperature data D _X0 stored in the first RAM address [82 to 83] H is shifted to the first RAM address [82 to 83] H as the temperature data D _X1 before the predetermined time T ₀ , and the temperature data newly read this time is changed to the current temperature. 0th RA as temperature data D _X0
It is stored in the M address [80 to 81] H.

Then, for example, a new predetermined time T _{63 is} newly set this time.
A shift temperature data D _X63 before temperature data D _X63 as 63 th RAM address [FE~FF] H,
This time the 0th RAM newly as the current temperature data D _X0
Temperature data D _X0 stored at address [80 to 81] H
And the temperature difference Δt (where Δt = D _X63 −D _X0 ) is calculated,
Whether or not a fire has occurred is determined by whether or not the temperature difference Δt during the predetermined time T ₆₃ is larger than a predetermined temperature difference threshold T _h .

By the way, as shown in FIG. 6, a data storage area [80-BF] H for storing data, a subroutine program, an interrupt program, etc. are used in the RAM area [00-FF] H of the microcomputer. Stack area [C0 to FF] H used when performing the operation, and an unmounted area [00 to FF] H
7F] H.

When only a part of the stack area [C0 to FF] H is used as a stack area, the remaining stack area can be used as a data storage area. When is used as a data storage area, the instruction code and the data are confused and the instruction code is treated as temperature data,
Temperature data may be treated as an instruction code, and it is desirable to minimize the use of the stack area as a data storage area in order to prevent malfunction of the differential thermal sensor. Thus, the capacity of the RAM area that can be used to store temperature data is naturally limited.

By the way, in the differential heat sensor used as a fire sensor, in order to define the sensitivity of the differential heat sensor, there are various sensitivity test standards as shown in Table 1 which are different depending on each country. It is provided.

[0010]

[Table 1]

That is, as shown in Table 1, in the sensitivity test of the differential thermal sensor, the operation limit set while increasing the ambient temperature of the differential thermal sensor at a predetermined temperature rising rate. A linear test that tests whether or not a fire detection alarm is activated depending on the time, and a test that determines whether or not a fire detection alarm is activated within a specified operation time limit by changing the ambient temperature of the differential heat detector in a stepwise manner There is a staircase examination. Moreover, even in the linear test, the temperature rise rate and the operation time limit of the sensitivity test standard differ depending on the country or the type of differential heat sensor, and even in the staircase test, the stepwise temperature rise value depends on the type. Are different.

Even if the microcomputer has only a small capacity RAM area [00 to FF] H, which can store only 64 pieces of temperature data as shown in FIG. 5, the temperature data is predetermined. Reading cycle T ₀
If, for example, T ₀ = 3 seconds is set and the temperature data read every 3 seconds is sequentially shifted and stored, 3 seconds of the read cycle T ₀ is exactly 3 seconds and an error occurs in the read temperature data. Without the above, all the sensitivity test specifications in Table 1 can be satisfied.

However, the reading cycle T ₀ is ± 20
% Error and read temperature data ± 2.5
If there is an error of ℃, it is possible to store only 64 temperature data as shown in FIG.
In a microcomputer provided only with the AM region [00 to FF] H, some of the sensitivity test standards in Table 1 can no longer be satisfied.

That is, for example, when the predetermined reading cycle T ₀ of the temperature data is set to T ₀ = 3 seconds, the reading cycle T ₀ has an error of ± 20% and the read temperature data is ± 2.5 ° C. If there is an error of, all the sensitivity test standards of Japan and the European standard B in the sensitivity test standards of Table 1 above
Although it can satisfy the sensitivity test standards of 10 ° C / min, 20 ° C / min and 30 ° C / min among the S standards and all the sensitivity test standards of the Australian AS standards, among the European BS standards The sensitivity test standard of 3 ° C / min and 5 ° C / min cannot be satisfied.

This is because when the predetermined reading cycle T ₀ of the temperature data is set to T ₀ = 3 seconds, the reading cycle T
_If there is an error of ± 20% in ₀ and an error of ± 2.5 ° C in the read temperature data, the sensitivity test standards of 3 ° C / min and 5 ° C / min in this European BS standard are satisfied. To achieve this, RA with a capacity that can store 177 or more temperature data
This is because a microcomputer having an M area is necessary. In other words, this is because a temperature difference of 3 seconds × 177 = 531 seconds or more is required.

Further, as shown in FIG. 5, a small capacity R which can store only 64 pieces of temperature data.
Even a microcomputer provided only with the AM region [00 to FF] H sets a predetermined temperature data reading period T ₀ to T ₀ = 12 seconds and sequentially shifts the temperature data read every 12 seconds. And store it,
Even if the read cycle T ₀ has an error of ± 20% and the read temperature data has an error of ± 2.5 ° C., it is possible to satisfy all the sensitivity test standards in Table 1 above.

This is because when the predetermined temperature data read cycle T ₀ is set to T ₀ = 12 seconds and the temperature data read every 12 seconds is sequentially shifted and stored, the read cycle T ₀ is ±. Even if there is an error of 20% and the temperature data that is read has an error of ± 2.5 ° C, it is the one that complies with the European BS standard that requires the most storage capacity for temperature data in the sensitivity test standards in Table 1 above. This is because in order to satisfy the sensitivity test standards of 3 ° C./min and 5 ° C./min, it is sufficient if at least 45 or more RAM areas having a capacity capable of storing temperature data are provided. In other words, 12 seconds x 45 =
This is because if a temperature difference of 540 seconds or more can be obtained, it will be in time.

However, since a storage capacity of 45 or more temperature data is required, as shown in FIG. 7, the storage capacity of the temperature data is insufficient only in the data storage area [80 to BF] H, and the stack area [C0 to The stack area [C0-DB] H in FF] H must be used as a data storage area. Also, in the Japanese staircase test in the sensitivity test standard of Table 1 above, the operation time limit is 30 seconds, so temperature data is read every 12 seconds and stored in the RAM area while shifting. Then 12 in 30 seconds
The fire determination can be performed only twice, that is, seconds and 24 seconds, and the reliability of the differential heat sensor deteriorates.

[0019]

As described above, in the conventional differential thermal sensor using the microcomputer, all the sensitivity test standards shown in Table 1 above are satisfied and the reliability of the fire judgment is improved. In order to secure the temperature, a large storage capacity that can store a large amount of temperature data is required, and of course the data storage area of the RAM area of the microcomputer is used as a temperature data storage area even for the stack area. Even if it was used, there was a problem that the data storage area for temperature data was insufficient.

The present invention has been made in order to solve the above problems, and an object of the present invention is to reduce the capacity of the data storage area for temperature data and to provide the above-mentioned Table 1.
It is an object of the present invention to provide an excellent differential heat sensor using a microcomputer, which can satisfy all the sensitivity test standards of 1. and can ensure high reliability of fire judgment.

[0021]

In order to solve the above-mentioned problems, the present invention provides an invention as set forth in claim 1, wherein the ambient temperature is sequentially read at a predetermined reading cycle and the temperature data is stored in a data storage area. A differential thermal sensor that stores the data while sequentially shifting and determines the presence or absence of a predetermined event from the temperature change rate that can be calculated from the temperature-based discrete value temperature data is read sequentially at the predetermined reading cycle. A first data storage area for storing temperature data and a second data storage area for storing only temperature data of a cycle of a predetermined integer multiple of the predetermined reading cycle among temperature data sequentially read in the predetermined reading cycle. And a first predetermined cycle storage means for storing temperature data sequentially read at the predetermined read cycle in the first data storage area while sequentially shifting the temperature data, Second predetermined cycle storage means for storing only temperature data of a cycle that is a predetermined integer multiple of the predetermined read cycle among the temperature data sequentially read in the predetermined read cycle while sequentially shifting the temperature data to the second data storage area. Is provided at least.

According to the invention of claim 2, the second
The predetermined cycle storage means converts the temperature data having a cycle of a predetermined integer multiple of the predetermined read cycle in the temperature data stored in the first data storage area into a cycle of a predetermined integer multiple of the predetermined read cycle. It is characterized in that it is a means for reading out synchronously and storing while sequentially shifting to the second data storage area.

[0023]

With the above configuration, in the invention according to the first aspect, each temperature data stored in the storage area has a relatively short time according to the first predetermined period storage means. Since the temperature data read at intervals and the temperature data read by the second predetermined period storage means at relatively long time intervals can coexist, a microcomputer having a relatively small RAM area can be used. Even the differential thermal sensor used can be adapted to the sensitivity test standards of various different countries.

According to the second aspect of the invention, the temperature data stored while being sequentially shifted to the first data storage area by the first predetermined cycle storage means and the second data by the second predetermined cycle storage means. Since it is possible to avoid overlapping with the temperature data that is stored while being sequentially shifted to the storage area, even a differential heat sensor using a microcomputer that has a smaller RAM area can be used in different countries. It is possible to meet the sensitivity test standard.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a differential thermal sensor according to the present invention will be described in detail below with reference to FIGS. 1 and 2, and a second embodiment will be described in detail with reference to FIGS.

[First Embodiment] FIG. 1 is an explanatory view showing a state in which temperature data is sequentially shifted and stored in a data storage area, and FIG. 2 is a diagram showing a state in which temperature data is sequentially shifted and stored in a data storage area. It is a flowchart to do.

The differential thermal sensor of the first embodiment is similar to the one described in the prior art with reference to FIG. 6 in the unmounted area [00-7F] H and the data storage area [80-. B
RA consisting of F] H and stack area [C0 to FF] H
The M region [00 to FF] H is provided. In addition, the differential thermal sensor of the first embodiment includes a temperature sensor (not shown) that performs an electrical output according to the ambient temperature of the differential thermal sensor,
Convert the electrical output from the temperature sensor to a temperature value, and
A reading unit (not shown) that sequentially reads at a cycle of every second is provided.

In the differential thermal sensor of the first embodiment,
As shown in FIG. 1, the stack area [C0 to CD] H in the stack area [C0 to FF] H is also used as a data storage area for temperature data. Moreover, the data storage area [80 to CD] H including the stack area [C0 to CD] H in FIG. 1 is the first data storage area [80
~ 95] H and the second data storage area [96-B3] H
And a third data storage area [B4 to CD] H.

First data storage area [80-95] H
Is a data storage area capable of storing 11 pieces of temperature data sequentially read by the reading unit through the temperature sensor at a reading cycle of every 3 seconds. The second data storage area [96 to B3] H includes a first sampling temperature data and a fifth sampling temperature data from a series of temperature data sequentially read at a reading cycle of 3 seconds via the temperature sensor. , And the ninth sampling temperature data, ..., A data storage area capable of storing only 15 (4N + 1) th sampling temperature data (where N is an integer of 0, 1, 2, ...). The third data storage area [B4 to CD] H includes a first sampling temperature data and a first sampling temperature data from a series of temperature data sequentially read by the temperature sensor at a read cycle of every 3 seconds.
7th sampling temperature data, 33rd sampling temperature data, ..., (16N + 1) th sampling temperature data (where N = 0, 1, 2, ...).
This is a data storage area that can store only 13 data items.

In the differential thermal sensor according to the first embodiment, the first predetermined cycle storage means, the second predetermined cycle storage means, and the third predetermined cycle storage means, which are software of the microcomputer, are provided. It has and. The first predetermined cycle storage means stores temperature data sequentially read at a read cycle of every 3 seconds in a first data storage area [80 to 95].
It is software that stores the data in H while sequentially shifting it from the 0th RAM address [80 to 81] H to the upper side.
The second predetermined cycle storage means stores (4N +) in a series of temperature data sequentially read at a read cycle of 3 seconds.
1) Sampling temperature data (however, N = 0, 1, 2, ...
Integer) of the second data storage area [96 to B3]
It is software that stores the data in H while sequentially shifting from the 11th RAM address [96 to 97] H to the upper side. The third predetermined cycle storage means stores (16th) of a series of temperature data sequentially read at a read cycle of 3 seconds.
N + 1) sampling temperature data (where N = 0, 1,
2, ..., Only the third data storage area [B4 ...
26th RAM address [B4 to B5] H to CD] H
It is software that stores the data while sequentially shifting it from the upper side to the upper side.

The operation of the differential thermal sensor of the first embodiment described above is shown in a flowchart of FIG. Next, the operation of the differential thermal sensor will be described with reference to the flowchart of FIG.

The differential thermal sensor which is powered on first executes step 100, and the time counters cnt3, cnt12, cnt
Initialize each value of 48 (cnt3 = cnt12 = cnt48 = 0 seconds). The time counter cnt3 is an active timer IC,
After the step 100 is executed, the elapsed time is counted with a resolution of at least seconds. Note that each of the time counters cnt12 and cnt48 is a time counter that is created by software depending on the time counter cnt3.

The differential thermal sensor which has executed step 100 executes step 101, and executes step 102 every time the count value of the time counter cnt3 becomes 3 seconds. The differential thermal sensor executing step 102 reads the ambient temperature of the differential thermal sensor through the temperature sensor, and proceeds to step 103.

The differential thermal sensor executing step 103 uses the temperature data D _x10 stored in the tenth RAM address [94 to 95] H as the temperature data 33 seconds before, in the data storage area [80 to Discarded from CD] H, 9
Th the RAM address [92-93] Temperature data D _x9 stored in H as temperature data D _x10 of 30 seconds before shifting to 10-th RAM address [94-95] H, ............, 0 Th RAM address [80-81]
The temperature data D _x0 stored in H as 3 seconds before temperature data D _x1 1 th RAM address [82-83] H
The temperature data newly read this time is set as the current temperature data D _x0 , and the 0th RAM address [80-
81] Store in H. In addition, the temperature data newly read this time is used as the current temperature data D _x11 and the eleventh R
26 th RAM address as the current temperature data D _x26 stores the AM address [96-97] H [9
6 to 97] H.

The differential thermal sensor having executed step 103 proceeds to step 104. The differential thermal sensor executing step 104 resets the count value of the time counter cnt3. The differential thermal sensor that has executed step 104 proceeds to step 105. If the count value of the time counter cnt12 is 12 seconds, the differential thermal sensor that executes step 105 executes step 106 and then step 10
5 is executed and the count value of the time counter cnt12 is not 12 seconds, step 200 is executed.

The differential thermal sensor executing step 200 adds 3 seconds to the present count value of the time counter cnt12 and proceeds to step 101. The differential thermal sensor that executes step 106 determines that the 25th RAM address [B2
~B3] The temperature data D _x25 stored in H 168
Data storage area [80-CD] as temperature data before seconds
Discard from H, and add 24th RAM address [B0-B
1] The temperature data D _x24 stored in H as temperature data D _x25 before 156 seconds shifted to 25 th RAM address [B2~B3] H, ............, 12 th R
The temperature data D _x12 stored in AM address [98-99] H shift as temperature data D _x13 of 12 seconds before the 13 th RAM address [9A~9B] H, the current temperature data by reading new time the temperature data D _x11 stored as D _x11 to 11-th RAM address [96-97] H, as the current temperature data D _x12 1
It is stored in the second RAM address [98 to 99] H.
It should be noted that the 11th RAM address [96 to 97] H seems to have the temperature data D _x11 equal to the temperature data D _x12 stored at the 12th RAM address [98 to 99] H stored therein. Has been

The differential thermal sensor having executed step 106 advances to step 107. The differential thermal sensor executing step 107 resets the count value of the time counter cnt12. The differential thermal sensor that has executed step 107 proceeds to step 108. If the count value of the time counter cnt48 is 48 seconds, the differential thermal sensor that executes step 108 executes step 109 and then step 1
08 is executed and the count value of the time counter cnt48 is 48.
If not seconds, step 300 is executed.

The differential thermal sensor executing step 300 adds 12 seconds to the present count value of the time counter cnt48 and proceeds to step 101. The differential heat sensor executing step 109 resets the count value of the time counter cnt48, and proceeds to step 110.

Differential Thermal Sensor Performing Step 110
Stored in the 38th RAM address [CC-CD] H
Temperature data D_x38576 seconds before temperature data
As a data storage area [80-CD] H,
Stored in the 37th RAM address [CA-CB] H
Temperature data D_x37528 seconds before temperature data D
_x3838th RAM address [CC-CD] H
To the 27th RAM address [B
6-B7] temperature data D stored in H_x2748
Temperature data before 2 seconds_x2828th RAM address as
Shift to [B8-B9] H and read this time
Current temperature data D_x26The 26th RAM address as
Temperature data D stored in space [B4 to B5] H_x26
The current temperature data D_x27As the 27th RAM
Store in the dress [B6 to B7] H. The 26th
RAM address [B4 to B5] H is now 27th R
Temperature data D stored in AM address [B6 to B7] H
_x27Temperature data equal to_{x2 6}Is stored as is and remains
It is supposed to be. Performed step 110
The differential heat sensor proceeds to step 101.

In the differential thermal sensor of the first embodiment in which the above-described operation is repeated successively, the first data storage area [80 to 95] H is set at an interval of 3 seconds in the past. Eleven pieces of temperature data that can go up are stored, and 15 pieces of temperature data that can go up in the past are stored at intervals of 12 seconds in the second data storage area [96 to B3] H. In the data storage area [B4 to CD] H of 13 are stored 13 temperature data that can go up in the past at intervals of 48 seconds.

That is, in the differential thermal sensor of the first embodiment, in the Japanese staircase test that requires temperature data of a short time width, the first data storage area [80-95] H It is possible to use the stored temperature data at intervals of 3 seconds, which requires temperature data of a medium time width.
C / min and 30 ° C / min sensitivity test standards and AS
In all the sensitivity test standards conforming to the standards, the temperature data stored in the second data storage area [96 to B3] H at intervals of 12 seconds can be used, and the temperature data having a long time width is required in Europe. BS standard compatible 3 ℃ / min and 5 ℃ /
According to the sensitivity test standard for the minute, the third data storage area [B4
.About.CD] H, the temperature data at 48-second intervals can be used.

Therefore, even in the case of a differential type thermal sensor using a microcomputer having a small RAM area that can be used, it is possible to use a conventional technique from a sensitivity test standard with a short operation time limit to a sensitivity test standard with a long operation time limit. All of the sensitivity test standards of each country shown as 1 can be satisfied, and a stack area can be provided with a margin.

[Second Embodiment] FIG. 3 is an explanatory view showing a state in which temperature data is sequentially shifted and stored in a data storage area, and FIG. 4 is a diagram showing a state in which temperature data is sequentially shifted and stored in a data storage area. It is a flowchart to do.

The differential type thermal sensor of the second embodiment is similar to the one described in the prior art with reference to FIG. 6 in the unmounted area [00-7F] H and the data storage area [80-. B
RA consisting of F] H and stack area [C0 to FF] H
The M region [00 to FF] H is provided. The differential heat sensor of the second embodiment, like the differential heat sensor of the first embodiment, also has a temperature sensor that performs an electrical output according to the ambient temperature of the differential heat sensor ( (Not shown), and a reading unit (not shown) for converting an electrical output from the temperature sensor into a temperature value and sequentially reading the temperature value every 3 seconds.

In the differential thermal sensor of the second embodiment,
As shown in FIG. 3, the stack area [C0 to C3] H in the stack area [C0 to FF] H is also used as a data storage area for temperature data. Moreover, the data storage area [80 to C3] H including the stack area [C0 to C3] H in FIG. 3 is the first data storage area [80
~ 95] H and the second data storage area [96-AF] H
And a third data storage area [B0 to C3] H.

First data storage area [80-95] H
Is a data storage area capable of storing 11 pieces of temperature data sequentially read by the reading unit through the temperature sensor at a reading cycle of every 3 seconds. The second data storage area [96 to AF] H has a first sampling temperature data and a fifth sampling temperature data from a series of temperature data sequentially read by the temperature sensor at reading intervals of 3 seconds. , And the ninth sampling temperature data, and so on, are data storage areas capable of storing only thirteen (4N + 1) th sampling temperature data (where N = 0, 1, 2, ...). The third data storage area [B0 to C3] H includes a first sampling temperature data and a first sampling temperature data from a series of temperature data sequentially read at a reading cycle of every 3 seconds via the temperature sensor.
7th sampling temperature data, 33rd sampling temperature data, ..., (16N + 1) th sampling temperature data (where N = 0, 1, 2, ...).
This is a data storage area capable of storing only 10 data items.

In the differential thermal sensor of the second embodiment, the first predetermined cycle storage means, the second predetermined cycle storage means, and the third predetermined cycle storage means, which are software of the microcomputer, are used. It has and.

The first predetermined cycle storage means stores the temperature data sequentially read at a read cycle of 3 seconds in the first data storage area [80 to 95] H at the 0th RAM address [80 to 81] H. It is software that stores the data while sequentially shifting it from the upper side to the upper side.

The second predetermined cycle storing means stores the (4N + 1) th sampling temperature data (where N = 0, in the series of temperature data sequentially read at the reading cycle of 3 seconds).
1, 2, ..., Only the first data storage area [8
0-95] 8th RAM address in H [80-8
1] Read from H to read the second data storage area [96-A
F] H is software that stores the data while sequentially shifting from the 11th RAM address [96 to 97] H to the upper side.

The third predetermined cycle storage means stores the (16N + 1) th sampling temperature data (where N = 0, in the series of temperature data sequentially read at the reading cycle of 3 seconds).
, Integers of 1, 2, ..., Only the second data storage area [9
6-AF] 21st RAM address in H [AA-
AB] H, read from the third data storage area [B0 to
24th RAM address in [C3] H [B0-B1] H
It is software that stores the data while sequentially shifting it from the upper side to the upper side.

The operation of the differential thermal sensor of the second embodiment described above is shown in a flowchart of FIG. Next, the operation of the differential thermal sensor will be described with reference to the flowchart of FIG.

The powered differential thermal sensor first executes step 500, and the time counters cnt3, cnt12, cnt
Initialize each value of 48 (cnt3 = cnt12 = cnt48 = 0 seconds). The time counter cnt3 is an active timer IC,
After the step 500 is executed, the elapsed time is counted with a resolution of at least seconds. Note that each of the time counters cnt12 and cnt48 is a time counter that is created by software depending on the time counter cnt3.

The differential thermal sensor which has executed step 500 executes step 501, and executes step 502 every time the count value of the time counter cnt3 becomes 3 seconds. The differential thermal sensor executing step 502 reads the ambient temperature of the differential thermal sensor via the temperature sensor, and proceeds to step 503.

The differential thermal sensor which executes step 503 uses the temperature data D _x10 stored in the 10th RAM address [94 to 95] H as the temperature data 33 seconds before the data storage area [80 to. C3] Discard from H, 9
Th the RAM address [92-93] Temperature data D _x9 stored in H as temperature data D _x10 of 30 seconds before shifting to 10-th RAM address [94-95] H, ............, 0 Th RAM address [80-81]
The temperature data D _x0 stored in H as 3 seconds before temperature data D _x1 1 th RAM address [82-83] H
The temperature data newly read this time is set as the current temperature data D _x0 , and the 0th RAM address [80-
81] Store in H.

The differential thermal sensor having executed step 503 advances to step 504. The differential thermal sensor executing step 504 resets the count value of the time counter cnt3. The differential thermal sensor that has executed step 504 proceeds to step 505. When the count value of the time counter cnt12 is 12 seconds, the differential thermal sensor which executes step 505 executes step 506 and then step 50
5 is executed and the count value of the time counter cnt12 is not 12 seconds, step 600 is executed.

The differential thermal sensor executing step 600 adds 3 seconds to the present count value of the time counter cnt12 and proceeds to step 501. The differential thermal sensor performing step 506 determines that the 23rd RAM address [AE
~ AF] 180 the temperature data D _x23 stored in H
Data storage area [80-C3] as temperature data before second
Discard it from H and write the 22nd RAM address [AC to A
The temperature data D _x22 stored in D] H is shifted to the 23rd RAM address [AE to AF] H as the temperature data D _x23 168 seconds before, and the 11th R is read.
The temperature data D _x11 stored in the AM address [96 to 97] H is shifted to the 12th RAM address [98 to 99] H as the temperature data D _x12 36 seconds before, and 24
The temperature data D _x8 stored in the eighth RAM address [90 to 91] H as the temperature data D _X8 before the second is read out, and the 11th RAM address [96 to 97] as the temperature data D _X11 24 seconds before is read. Store in H. 8
The temperature data D _x8 equal to the temperature data D _x11 stored in the eleventh RAM address [96 to 97] H is stored in the thirteenth RAM address [90 to 91] H as it is and left. There is.

The differential thermal sensor having executed step 506 advances to step 507. The differential thermal sensor executing step 507 resets the count value of the time counter cnt12. The differential thermal sensor having executed step 507 proceeds to step 508. The differential thermal sensor executing step 508 executes step 509 if the count value of the time counter cnt48 is 48 seconds and then executes step 5
08 is executed and the count value of the time counter cnt48 is 48.
If not seconds, step 700 is executed.

The differential thermal sensor executing step 700 adds 12 seconds to the present count value of the time counter cnt48 and proceeds to step 501. The differential thermal sensor executing step 509 resets the count value of the time counter cnt48, and proceeds to step 510.

Differential Thermal Sensor Performing Step 510
Stored in the 33rd RAM address [C2-C3] H
Temperature data D_x33624 seconds before temperature data
As the data storage area [80-C3] H,
Stored in the 32nd RAM address [C0-C1] H
Temperature data D_x32576 seconds before temperature data D
_x3333rd RAM address [C2-C3] H
Shift to ............ The 24th RAM address [B
0 to B1] H, the temperature data D stored in_x2419
Temperature data 2 seconds before_x2525th RAM add as
Shift to [B2-B3] H, and the temperature
Data D_X2421st RAM address [AA to A
B] Temperature data D stored in H_x21Read
Temperature data D 144 seconds ago_X2424th RAM as
Store at address [B0 to B1] H. The 21st
RAM address [AA-AB] H is now the 24th
Temperature data stored in RAM address [B0-B1] H
D_x24Temperature data equal to _x21Is stored as is
It seems to remain. Perform step 510
The differential thermal sensor proceeds to step 501.

In the differential thermal sensor according to the second embodiment, in which the above-described operation is repeated successively, the first data storage area [80 to 95] H has a past interval of 3 seconds. Eleven pieces of temperature data that can go up are stored, and 13 pieces of temperature data that can go up in the past are stored at intervals of 12 seconds in the second data storage area [96 to AF] H. In the data storage area [B0 to C3] H of 10 are stored 10 temperature data that can go up in the past at intervals of 48 seconds.

That is, in the differential heat sensor of the second embodiment, in the Japanese staircase test that requires temperature data of a short time width, the first data storage area [80 to 95] H It is possible to use the stored temperature data at intervals of 3 seconds, which requires temperature data of a medium time width.
C / min and 30 ° C / min sensitivity test standards and AS
In all the sensitivity test standards corresponding to the standards, the temperature data stored in the second data storage area [96 to AF] H at intervals of 12 seconds can be used, and the temperature data having a long time width is required in Europe. BS standard compatible 3 ℃ / min and 5 ℃ /
According to the sensitivity test standard for minutes, the third data storage area [B0
.About.B3] H, the temperature data at 48-second intervals can be used.

Therefore, in the differential heat sensor of the second embodiment, the temperature data stored while being sequentially shifted to the first data storage area [80 to 95] H by the first predetermined period storage means. Temperature data stored while being sequentially shifted to the second data storage area [96 to AF] H by the second predetermined cycle storage means, and third temperature data stored by the third predetermined cycle storage means.
Since it is possible to avoid overlapping with the temperature data stored while sequentially shifting to the data storage area [B0 to C3] H of
Compared with the differential thermal sensor of the first embodiment, even if a microcomputer having a smaller usable RAM area is used, from the sensitivity test standard with a short operation time limit to the sensitivity test standard with a long operation time limit, the conventional technique is used. All the sensitivity test standards of each country shown in Table 1 can be satisfied.
In addition, the stack area can be used less as a data storage area for temperature data, so the instruction code is not treated as temperature data and the temperature data is not treated as an instruction code, improving reliability. Can be achieved.

[0063]

Since the differential thermal sensor of the present invention is constructed as described above, in the invention of claim 1, even a microcomputer having a small RAM area has many differences. The sensitivity test standard can be satisfied by one unit, and in the invention according to the second aspect, many different sensitivity test standards can be satisfied by one unit even if the microcomputer has a smaller RAM area. It is possible to provide an excellent differential heat sensor using a microcomputer.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a state in which temperature data of a differential thermal sensor according to the present invention is sequentially shifted and stored in a data storage area.

FIG. 2 is a flow chart showing the operation of the above differential thermal sensor.

FIG. 3 is an explanatory diagram showing a state in which temperature data of another differential thermal sensor according to the present invention is sequentially shifted and stored in a data storage area.

FIG. 4 is a flowchart showing the operation of the other differential thermal sensor described above.

FIG. 5 is an explanatory diagram showing a data storage area of a microcomputer included in a conventional differential thermal sensor.

FIG. 6 is an explanatory diagram showing a RAM area of a microcomputer included in a conventional differential thermal sensor.

FIG. 7 is an explanatory diagram showing a data storage area of a microcomputer included in a conventional differential thermal sensor.

[Explanation of symbols]

 103 first predetermined cycle storage means 106 second predetermined cycle storage means 503 first predetermined cycle storage means 506 second predetermined cycle storage means D temperature data

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] December 9, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0034

[Correction method] Change

[Correction content]

The differential thermal sensor executing step 103 uses the temperature data D _x10 stored in the tenth RAM address [94 to 95] H as the temperature data 33 seconds before, in the data storage area [80 to Discarded from CD] H, 9
Th the RAM address [92-93] Temperature data D _x9 stored in H as temperature data D _x10 of 30 seconds before shifting to 10-th RAM address [94-95] H, ............, 0 Th RAM address [80-81]
The temperature data D _x0 stored in H as 3 seconds before temperature data D _x1 1 th RAM address [82-83] H
The temperature data newly read this time is set as the current temperature data D _x0 , and the 0th RAM address [80-
81] that stores in H.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0036

[Correction method] Change

[Correction content]

The differential thermal sensor executing step 200 adds 3 seconds to the present count value of the time counter cnt12 and proceeds to step 101. The differential thermal sensor that executes step 106 determines that the 25th RAM address [B2
~B3] The temperature data D _x25 stored in H 180
Data storage area [80-CD] as temperature data before seconds
Discard from H, and add 24th RAM address [B0-B
1] The temperature data D _x24 stored in H as temperature data D _x25 before 168 seconds shifted to 25 th RAM address [B2~B3] H, ............, 1 1 th R
The temperature data _Dx11 stored in the AM address [96 to 97] H is shifted to the 12th RAM address [98 to 99] H as the temperature data _Dx12 12 seconds before , and a new data is added.
The current temperature data read this time is the temperature data D _x11
To the 11th RAM address [96-97] H as
Pay.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0039

[Correction method] Change

[Correction content]

Differential Thermal Sensor Performing Step 110
Stored in the 38th RAM address [CC-CD] H
Temperature data D_x38To624Temperature data before seconds
As a data storage area [80-CD] H,
Stored in the 37th RAM address [CA-CB] H
Temperature data D_x37To576Temperature data before 2 seconds
_x3838th RAM address [CC-CD] H
Shift to …………Two6th RAM address [B
4 to B5] temperature data D stored in H_x26ToFour
8 seconds agoTemperature data D_x27As the 27th RAM add
Less [B6-B7] HShifted and newly read this time
26th as the current temperature data as temperature data D _x26
Of the RAM address [B4 to B5] H.Step
The differential thermal sensor executing step 110 is step 101.
Go to.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0062

[Correction method] Change

[Correction content]

Therefore, in the differential heat sensor of the second embodiment, the temperature data stored while being sequentially shifted to the first data storage area [80 to 95] H by the first predetermined period storage means. Temperature data stored while being sequentially shifted to the second data storage area [96 to AF] H by the second predetermined cycle storage means, and third temperature data stored by the third predetermined cycle storage means.
Since it is possible to avoid overlapping with the temperature data stored while sequentially shifting to the data storage area [B0 to C3] H of
Compared with the differential thermal sensor of the first embodiment, even if a microcomputer having a smaller usable RAM area is used, from the sensitivity test standard with a short operation time limit to the sensitivity test standard with a long operation time limit, the conventional technique is used. All the sensitivity test standards of each country shown in Table 1 can be satisfied.
In addition, since it is possible to reduce the use of even the stack area as a data storage area for temperature data, there is little risk that the instruction code will be treated as temperature data or the temperature data will be treated as an instruction code, and reliability will be improved. Can be improved.

[Procedure Amendment 5]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

[Correction method] Change

[Correction content]

[Fig. 2]

Claims (2)

[Claims] 1. An ambient temperature is sequentially read at a predetermined reading cycle, the temperature data is sequentially shifted and stored in a data storage area, and a predetermined temperature change rate that can be calculated from the temperature-series discrete temperature data is set. In a differential thermal sensor for determining the presence / absence of an event, a first data storage area for storing temperature data sequentially read at the predetermined read cycle and a temperature data sequentially read at the predetermined read cycle are selected. A second data storage area for storing only temperature data having a cycle of a predetermined integer multiple of the predetermined reading cycle, and temperature data sequentially read at the predetermined reading cycle are stored in the first data storage area while being sequentially shifted. A first predetermined cycle storing means, and a portion of the temperature data sequentially read in the predetermined read cycle, which corresponds to the predetermined read cycle. A differential thermal sensor, comprising at least a second predetermined cycle storage means for storing only temperature data having a cycle of a constant integer multiple while sequentially shifting and storing the temperature data in the second data storage area. 2. The second predetermined cycle storage means is the first
Of the temperature data stored in the data storage area of
The temperature data having a cycle of a predetermined integer multiple of the predetermined read cycle is read in synchronization with a cycle of a predetermined integer multiple of the predetermined read cycle, and the temperature data is sequentially shifted and stored in the second data storage area. The differential thermal sensor according to claim 1, wherein the thermal sensor is a differential thermal sensor.