KR20200132683A - Temperature controller and abnormality determination method - Google Patents

Abstract

An objective of the present invention is to vitalize the performance of a heater to a sufficient level as long as there is no damage to the heater. A calculation part (103) calculates a temperature rise change per unit time of a heater (101) as measured by a measurement part (102) to determine the speed of the temperature rise. A first detection part (104) detects that a measurement temperature measured by the measurement part (102) exceeds a preset first value. A second detection part (105) detects that the temperature rise speed calculated by the calculation part (103) exceeds a preset second value. A first gauging part (106) gauges the duration for which the first detection part (104) is detecting that the measured temperature exceeds the first value, and also, the second detection part (105) is detecting that the temperature rise speed exceeds the second value. A determination part (107) determines a case in which the duration gauged by the first gauging part (106) exceeds a preset first time, as an abnormal case.

Description

Temperature controller and abnormality judgment method {TEMPERATURE CONTROLLER AND ABNORMALITY DETERMINATION METHOD}

The present invention relates to a temperature controller and an abnormality determination method for controlling a temperature of a control object.

A temperature controller that controls the temperature of various temperature environments, displays a numerical value of the temperature of the monitored object detected using a temperature sensor such as a thermocouple or a resistance thermometer, and also outputs a control output to the heater according to the detected temperature and the set temperature. Is obtained, and the temperature of the monitored object is controlled.

By the way, since the heater is damaged if handled incorrectly, the following alarm settings and control outputs can be generally set in a device that controls a heater such as a temperature controller (see Patent Document 1 and Patent Document 2). The user of the heater uses this function to output an alarm and also limits the current flowing through the heater.

ㆍMonitoring the temperature to prevent heating above the temperature specified by the heater manufacturer (temperature upper limit alarm).

ㆍMonitoring of the rate of temperature change (temperature change rate alarm) to ensure that the heating rate does not exceed the heating rate specified by the heater manufacturer.

ㆍMonitors the upper limit of the control value (MV value) of the temperature controller and issues an alarm when it exceeds the upper limit of alarm (MV upper limit alarm).

ㆍSet the upper limit (control value upper limit) of the control value (MV value) so that the temperature controller does not output more than necessary (control value upper limit setting).

ㆍMeasures the current flowing through the heater and generates an alarm when a current exceeding the set value flows (overcurrent alarm).

Patent Document 1: Japanese Patent Laid-Open No. Hei 09-243098 Patent Document 2: Japanese Patent Laid-Open No. 01-298385

As described above, the heater is damaged by mishandling. For example, if the temperature is raised at a rate of change of temperature above the rated value (eg, 100°C/s), the heater is damaged. The temperature change rate differs in characteristics for each type of heater, and the specification regarding the temperature change rate is presented from the manufacturer of the heater. Heater characteristics vary with temperature, and the rate of temperature change may be different depending on the temperature range, but the specifications regarding the rate of change of temperature suggested by the manufacturer of the heater are often representative values that can be safely used in the entire temperature range. For this reason, for example, even if the specification regarding the rate of temperature change suggested by the manufacturer of the heater is 50°C/s, in practical use, the heater is not damaged even at 80°C/s if it is 200°C or less.

Further, as a characteristic of the heater, even if the temperature is changed by more than the prescribed rate of change of temperature, deterioration may not be reached if the changed time is a short time. For example, even if the specification regarding the rate of temperature change suggested by the manufacturer of the heater is 50°C/s, the heater is not damaged if the time at 80°C/s is 10 s or less.

The general temperature change rate alarm is set based on the temperature change rate suggested by the heater manufacturer. When this set value is exceeded, the temperature controller outputs an alarm and reduces the output MV value (for example, to 0%). However, since the limit of this control is set based on the temperature change rate suggested by the heater manufacturer, depending on the temperature of the heater or the time when the temperature change rate exceeds the upper limit, even if the limit is exceeded, it does not cause damage to the heater. There are cases that do not. As described above, when a heater that does not cause damage even if the limit is exceeded can be used, there is a possibility that the controllability of the temperature can be improved by using the heater within this range.

As described above, conventionally, damage to the heater can be prevented, but there has been a problem that the ability of the heater cannot be sufficiently utilized.

The present invention has been made to solve the above problems, and an object of the present invention is to make full use of the ability of the heater within a range that does not cause damage to the heater.

A temperature controller according to the present invention is a temperature controller that controls a heating ability of a heater to control a temperature of a control object to a preset temperature, a measurement unit configured to measure the temperature of the heater, and a unit of the heater measured by the measurement unit A calculation unit configured to obtain the change in temperature increase per hour as a temperature increase rate, a first detection unit configured to detect that the measured temperature measured by the measurement unit exceeds a preset first value, and a temperature increase rate determined by the calculation unit are preset A second detection unit configured to detect exceeding a second value that has been set, and the first detection unit detects that the measured temperature exceeds the first value, and the second detection unit further includes a heating rate exceeding the second value. A first measurement unit configured to measure the time that the state in which it is being detected continues, a determination unit configured to determine that it is an abnormality when the time measured by the first measurement unit exceeds a preset first time, and the determination unit determine that it is an abnormality It is provided with an output unit for outputting an alarm.

In one configuration example of the temperature controller, a third detection unit configured to detect that the measurement temperature measured by the measurement unit exceeds a preset third value higher than the first value, and the third detection unit, wherein the measurement temperature is Further comprising a second measurement unit configured to detect a thing exceeding the third value, and the second detection unit to measure a time period during which the state in which the temperature increase rate exceeds the second value continues, and the determination unit includes a first If the time measured by the measurement unit exceeds the first time or the time measured by the second measurement unit exceeds a preset second time, it is determined as abnormal.

In one configuration example of the temperature controller, a third detection unit configured to detect that the measurement temperature measured by the measurement unit exceeds a preset third value higher than the first value, and the temperature increase rate determined by the calculation unit is A fourth detection unit configured to detect exceeding a preset fourth value different from the second value, and the third detection unit detect that the measured temperature exceeds the third value, and the fourth detection unit further includes a heating rate Further comprising a second measurement unit configured to measure a time during which the state in which the state in which is exceeding the fourth value continues to be measured, the determination unit, the time measured by the first measurement unit exceeds the first time, or the second measurement unit If the time to measure exceeds the second preset time, it is judged as abnormal.

In one configuration example of the temperature controller, the first time and the second time are the same.

The abnormality determination method according to the present invention includes a first step of obtaining a change in temperature increase per unit time of a measured heater as a heating rate, and a first step of detecting that the measured temperature of the measured heater exceeds a preset first value. In step 2 and in a third step of detecting that the heating rate obtained in the first step exceeds a preset second value, and in the second step, it is detected that the measured temperature exceeds the first value, and further In the third step, the fourth step of measuring the time that the state in which the temperature increase rate exceeds the second value is detected continues, and the time measured in the fourth step exceeds the first preset time, it is said to be abnormal. And a fifth step of determining.

In one configuration example of the abnormality determination method, in the sixth step of detecting that the measured temperature exceeds a preset third value higher than the first value, and in the sixth step, the measured temperature is The excess is detected, and in the third step, the seventh step of measuring the time during which the state in which the temperature increase rate exceeds the second value is detected continues, and the time measured in the seventh step is preset. An eighth step of determining that it is abnormal when the second time is exceeded is further provided.

In one configuration example of the abnormality determination method, the sixth step of detecting that the measured temperature measured by the measuring unit exceeds a preset third value higher than the first value, and the heating rate determined by the first step are , A seventh step of detecting that a predetermined fourth value higher than the second value has been exceeded, and the sixth step detects that the measured temperature has exceeded the third value, and the seventh step is the temperature increase rate The eighth step of measuring the time that the state in which the state in which is exceeding the fourth value is continued is measured, and the ninth step of determining that it is abnormal if the time measured in the eighth step exceeds a second preset time. It has more.

In one configuration example of the abnormality determination method, the first time and the second time are the same.

As described above, according to the present invention, the state in which the first detection unit detects that the measured temperature exceeds the first value, and the second detection unit detects that the temperature increase rate exceeds the second value continues. When the time is measured and the time to be measured exceeds the first preset time, it is judged as abnormal, so that the ability of the heater can be sufficiently utilized within a range that does not cause damage to the heater.

1 is a configuration diagram showing a configuration of a temperature control system according to a first embodiment of the present invention.
2 is a flowchart for explaining an abnormality determination method according to the first embodiment of the present invention.
3 is a configuration diagram showing a configuration of a temperature control system according to Embodiment 2 of the present invention.
4 is a flowchart for explaining an abnormality determination method according to the second embodiment of the present invention.
5 is a configuration diagram showing a configuration of a temperature control system according to a third embodiment of the present invention.
6 is a flowchart for explaining an abnormality determination method according to the third embodiment of the present invention.
7 is a configuration diagram showing a hardware configuration of a calculation unit, a first detection unit, a second detection unit, a third detection unit, a first measurement unit, a second measurement unit, and a determination unit of the temperature controller according to the embodiment of the present invention.

Hereinafter, a temperature controller according to an embodiment of the present invention will be described.

[Embodiment 1]

First, a temperature controller according to Embodiment 1 of the present invention will be described with reference to FIG. 1. This temperature controller controls the heating ability of the heater 101 to control the temperature of the control object to a preset temperature. This temperature controller includes a measurement unit 102, a calculation unit 103, a first detection unit 104, a second detection unit 105, a first measurement unit 106, a determination unit 107, an output unit 108, A determination value storage unit 120 and a control unit 121 are provided.

The measurement unit 102 measures the temperature of the heater 101. The control unit 121 generates and outputs a control value for controlling the operation of the heater 101 that heats the control object based on the relationship between the measured temperature measured by the measurement unit 102 and the set temperature.

The calculation unit 103 obtains the change in temperature increase per unit time of the heater 101 measured by the measurement unit 102 as a temperature increase rate. The first detection unit 104 detects that the measurement temperature measured by the measurement unit 102 exceeds a first preset value stored in the determination value storage unit 120. For example, 250°C may be set as the first value. The second detection unit 105 detects that the heating rate obtained by the calculation unit 103 exceeds a preset second value. For example, 50°C/sec can be set as the second value.

The first measurement unit 106 detects that the measured temperature exceeds the first value by the first detection unit 104, and the second detection unit 105 detects that the temperature increase rate exceeds the second value, Measure the time that the present state continues. The determination unit 107 determines that it is abnormal if the time measured by the first measurement unit 106 exceeds a preset first timer setting value (first time) stored in the determination value storage unit 120. . The first timer setting value can be, for example, 2 seconds. The output unit 108 outputs an alarm when the determination unit 107 determines that it is abnormal. For example, the indication that an abnormality has occurred is displayed on a display unit not shown. Further, it is notified as an alarm by voice or the like using a horn or a speaker.

For example, conventionally, when the specification regarding the rate of change of temperature suggested by the manufacturer of the heater is 50°C/s, 50°C/s is set as the determination value of the rate of temperature increase obtained at the measured temperature. Accordingly, an alarm is issued when the temperature increase rate obtained from the measured temperature is 50°C/s or more, and the control value output to the heater 101 becomes zero, and so on.

In such an abnormality avoidance control, for example, if the heater 101 is practically 200°C or less, the heater is not damaged even at 80°C/s, and the heating rate is 50°C even when used in a low temperature region where the heating temperature is less than 200°C. You cannot do more than /s. On the other hand, in this type of heat treatment, for example, it is possible to shorten the treatment time by increasing the temperature increase rate.

In contrast, according to Embodiment 1, for example, when the heating temperature is less than 250°C, it is not judged to be abnormal even if the temperature increase rate is 50°C/s or more. Further, even if the heating temperature is 250°C or higher, it is not judged to be abnormal if the time at which the heating rate becomes 50°C/s or higher is 9 seconds or less. For this reason, according to Embodiment 1, it becomes possible to make the temperature increase rate faster, and it becomes possible to shorten the processing time. For example, by using a heater that can be used at a higher temperature increase rate, even in conventional control using a rated value, the temperature increase rate can be made faster, and the processing time can be shortened. However, such a high-speed heating heater is expensive and causes an increase in cost. In contrast, according to the first embodiment, it is not necessary to use a high-liquid heater. As described above, according to the first embodiment, the ability of the heater 101 can be sufficiently utilized within a range that does not cause damage to the heater.

Next, an operation example (abnormality determination method) of the temperature controller according to the first embodiment will be described using the flowchart in FIG. 2.

First, in step S101, the calculation unit 103 obtains the measured change in temperature increase per unit time of the heater 101 as a temperature increase rate (first step). Next, in step S102, the first detection unit 104 detects that the measured temperature of the heater 101 has exceeded a first preset value stored in the determination value storage unit 120. (Step 2). If the first detection unit 104 detects that the measured temperature has exceeded the first value (yes in step S102), in step S103, the second detection unit 105 determines the determined temperature increase rate. It is detected that the second preset value stored in) is exceeded (third step).

When the second detection unit 105 detects that the temperature increase rate exceeds the second value (yes in step S103), the first measurement unit 106 detects that the temperature increase rate exceeds the second value in step S104. It is determined whether or not the measurement of the time during which the current state continues. When the time measurement has not started (no in step S104), in step S105, the first measurement unit 106 detects that the measured temperature exceeds the first value and the temperature increase rate exceeds the second value. The time measurement for which the existing state continues (step 4) is started, and the process proceeds to step S106. Further, when the time measurement has started (yes in step S104), the process proceeds to step S106.

Next, in step S106, the determination unit 107 determines whether or not the measured time exceeds a preset first timer set value (first time) stored in the determination value storage unit 120 (Step 5). When the measured time exceeds the first timer set value (yes in step S106), in step S107, the first measuring unit 106 stops (terminates) the time measurement, and in step S108, the determination unit 107 It is determined that it is abnormal (Step 5). In addition, the measurement of time continues as long as it is detected that the measurement temperature has exceeded the first value and that the temperature increase rate has exceeded the second value (steps S101 to S106). If the determination unit 107 determines that there is an abnormality, in step S109, abnormality processing (transition to an operation amount in case of abnormality, an alarm is issued, etc.) is performed. After the abnormal processing, the state is maintained until the cancel operation is performed in step S131.

[Embodiment 2]

Next, a temperature controller according to Embodiment 2 of the present invention will be described with reference to FIG. 3. This temperature controller controls the heating ability of the heater 101 to control the temperature of the control object to a preset temperature. This temperature controller includes a measurement unit 102, a calculation unit 103, a first detection unit 104, a second detection unit 105, a first measurement unit 106, an output unit 108, and a determination value storage unit 120. ) And a control unit 121. These are the same as in the first embodiment described above.

In the second embodiment, further, as a threshold of the measurement temperature, a third preset value higher than the first value, a first time applied as a first timer setting value when the measurement temperature is greater than or equal to the first value and less than the third value, and And a second time applied as a second timer setting value when the measured temperature is equal to or greater than the third value. Further, these third values and second timer set values (second time) are also stored in the determination value storage unit 120 in the same manner as the first value, second value, and first timer set value (first time). In the second embodiment, for example, 100° C. can be set as the first value, 50° C./second can be set as the second value (temperature increase rate threshold), and 250° C. can be set as the third value.

In addition, in the second embodiment, the determination unit 107a is a system in which the time measured by the first measurement unit 106 exceeds the first timer setting value, or the time measured by the second measurement unit 110 is preset. 2 If the timer setting value is exceeded, it is judged as abnormal. In the second embodiment, the first timer set value may be 3 seconds, for example, and the second timer set value may be 2 seconds. Further, the first timer setting value and the second time may be the same value.

Also in Embodiment 2, as in Embodiment 1 described above, the ability of the heater 101 can be sufficiently utilized within a range that does not cause damage to the heater. In addition, in the second embodiment, the time criterion for determining an abnormality can be set in two temperature regions, respectively. For this reason, in a lower temperature region, for example, the criterion of the abnormal judgment time can be made longer, and, for example, a faster temperature rise is possible. In addition, in the above-mentioned, although the determination standard of the measurement temperature was made into two of a 1st value and a 3rd value, it is not limited to this, and three or more determination standards of a measurement temperature may be made.

Next, an operation example (abnormality determination method) of the temperature controller according to the second embodiment will be described using the flowchart in FIG. 4. Incidentally, the abnormality determination based on the first timer setting value using the first value and the second value is the same as that of the first embodiment, and a description thereof will be omitted below.

First, in step S101, the calculation unit 103 obtains the measured change in temperature increase per unit time of the heater 101 as a temperature increase rate (first step). Next, in step S112, when the first detection unit 104 detects that the measured temperature of the measured heater 101 is greater than or equal to a preset first value and less than a third value (yes in step S112), the timer A first timer set value (first time) is selected and set in the determination value storage unit 120 as the set value (step S113). After that, it proceeds to step S103.

On the other hand, when the first detection unit 104 detects that the measured temperature is greater than or equal to the third value (yes in step S114), a second timer set value (second time) is selected from the determination value storage unit 120 as a timer set value. Set (step S115). Subsequently, in step S103, the second detection unit 105 detects that the temperature increase rate has exceeded a preset second value.

When the second detection unit 105 detects that the temperature increase rate exceeds the second value (yes in step S103), the first measurement unit 106 detects that the temperature increase rate exceeds the second value in step S104. It is determined whether or not the measurement of the time during which the current state continues. When the time measurement has not started (no in step S104), in step S115, the second measurement unit 110 detects that the measured temperature exceeds the third value and the temperature increase rate exceeds the second value. The time measurement for which the existing state continues (step 7) is started, and the flow proceeds to step S116. Further, when the time measurement has started (yes in step S104), the process proceeds to step S116.

Next, in step S116, the determination unit 107a determines whether or not the measured time exceeds the second timer set value (second time) set in advance. When the measured time exceeds the second timer setting value (yes in step S116), in step S117, the second measuring unit 110 stops (ending) the measurement of time, and in step S118, the determination unit 107a is It judges that it is abnormal (step 8). In addition, the measurement of time continues as long as it is detected that the measurement temperature has exceeded the third value, and that the temperature increase rate has exceeded the second value (steps S101 to S116). If the determination unit 107a determines that there is an abnormality, in step S119, abnormal processing (transition to the operation amount in case of abnormality, an alarm is issued by the output unit 108, etc.) is performed. After the abnormal processing, the state is maintained until the cancel operation is performed in step S131.

[Embodiment 3]

Next, a temperature controller according to Embodiment 3 of the present invention will be described with reference to FIG. 5. This temperature controller controls the heating ability of the heater 101 to control the temperature of the control object to a preset temperature. This temperature controller includes a measurement unit 102, a calculation unit 103, a first detection unit 104, a second detection unit 105, a first measurement unit 106, an output unit 108, and a determination value storage unit 120. ) And a control unit 121. These are the same as in the first embodiment described above.

In Embodiment 3, further, as a threshold value of the measurement temperature, a third preset value higher than the first value, a second value applied as a temperature increase rate threshold when the measurement temperature is greater than or equal to the first value and less than the third value, When the measured temperature is equal to or higher than the third value, a fourth value applied as a threshold value of the temperature increase rate is provided. In Embodiment 3, for example, 100°C can be set as the second value and 250°C can be set as the third value.

In addition, in the third embodiment, the third detection unit 109 detects that the measured temperature exceeds the third value, and the fourth detection unit 111 detects that the temperature increase rate exceeds the fourth value. It includes a second measurement unit (110a) for measuring the time the state continues. For example, 80°C/sec can be set as the second value and 50°C/sec can be set as the fourth value. In addition, this fourth value is also stored in the determination value storage unit 120 similarly to the first value, the second value, the third value, the first timer set value (first time), and the second timer set value (second time). have.

In addition, in the third embodiment, in the determination unit 107b, the time measured by the first measurement unit 106 exceeds the first timer setting value (first time), or the time measured by the second measurement unit 110a is If it exceeds the preset second timer setting value (second time), it is judged as abnormal. In Embodiment 3, the first timer setting value and the second timer setting value can be 3 seconds. Further, in the third embodiment, the first timer set value may be 3 seconds, for example, and the second timer set value may be 2 seconds.

Also in the third embodiment, as in the first embodiment described above, the ability of the heater 101 can be sufficiently utilized within a range that does not cause damage to the heater. In addition, in the third embodiment, two standards of the temperature increase rate for the determination to be abnormal are prepared as the second value and the fourth value, and can be set in the two temperature regions, respectively. For this reason, in a lower temperature range, for example, the standard of the above-mentioned temperature rise rate can be set to a faster value, and, for example, a faster temperature rise is possible. In addition, in the above-mentioned, although the determination standard of the measurement temperature was made into two of a 1st value and a 3rd value, it is not limited to this, and three or more determination standards of a measurement temperature may be made. In addition, in accordance with this, three or more standards of the rate of temperature increase in the judgment to be abnormal can also be set.

Next, an operation example (abnormality determination method) of the temperature controller according to the third embodiment will be described using the flowchart in FIG. 6.

First, in step S101, the calculation unit 103 obtains the measured change in temperature increase per unit time of the heater 101 as a temperature increase rate (first step). Next, in step S112, when the first detection unit 104 detects that the measured temperature of the measured heater 101 is greater than or equal to a preset first value and less than a third value (yes in step S112), the timer A first timer set value (first time) is selected and set in the determination value storage unit 120 as a set value (step S123), and a second value is selected and set in the determination value storage unit 120 as a temperature increase rate threshold ( Step S124). After that, it proceeds to step S103.

On the other hand, when the first detection unit 104 detects that the measured temperature is greater than or equal to the third value (yes in step S125), the second timer set value (second time) is selected from the determination value storage unit 120 as the timer set value. It is set (step S126), and a fourth value is selected and set in the determination value storage unit 120 as the temperature increase rate threshold (step S127).

In the fourth detection unit 111, when it is detected that the temperature increase rate exceeds the fourth value (yes in step S113), in step S104, the first measurement unit 106, the measurement temperature exceeds the third value, and It is determined whether or not the measurement of the time during which the state in which the state in which the temperature increase rate exceeds the fourth value is detected has started. When the time measurement has not started (no in step S104), in step S125, the second measurement unit 110a detects that the measured temperature exceeds the third value and the temperature increase rate exceeds the fourth value. The time measurement for which the existing state continues (step 8) is started, and the flow proceeds to step S116. Further, when the time measurement has started (yes in step S104), the process proceeds to step S116.

Next, in step S126, the determination unit 107b judges whether or not the measured time exceeds the second timer set value previously set as the timer set value (9th step). When the measured time exceeds the second timer set value (yes in step S126), in step S127, the second measuring unit 110a stops (ending) the time measurement, and in step S128, the determination unit 107b It is determined that it is abnormal (Step 9). In addition, the measurement of time continues as long as it is detected that the measurement temperature has exceeded the third value and that the temperature increase rate has exceeded the fourth value (steps S101 to S126). If the determination unit 107b determines that there is an abnormality, in step S129, as an abnormality processing, the output unit 108 issues (outputs) an alarm. Further, when a termination instruction is input, it is terminated (yes in step S131).

In addition, the first value (temperature reference) is set to 250°C, and when the measured temperature is less than 250°C, the upper limit of the heating rate is set to 80°C/s, and when the measured temperature is 250°C or higher, the rate of heating is increased. It is also possible to set the upper limit to 50°C/s. In addition, when the first value is 100°C, the third value is 250°C, and the measured temperature is less than 100°C, the upper limit of the heating rate is 80°C/s, and the measured temperature is 100°C or more and 250 When it is less than °C, the upper limit of the temperature increase rate may be 50°C/s, and when the measured temperature is 250°C or more, the upper limit of the temperature increase rate may be 40°C/s.

In addition, when the measured temperature is less than 100°C, the upper limit of the temperature increase rate may be 80°C/s, and the time for determination may be, for example, 3s. In addition, when the measured temperature is 100° C. or more and less than 250° C., the upper limit of the temperature increase rate may be 50° C./s, and the time for determination may be, for example, 2 s. In addition, when the measured temperature is 250° C. or higher, the upper limit of the temperature increase rate may be 40° C./s, and the time for determination may be, for example, 1 s.

In addition, as shown in FIG. 7, the calculation unit, the first detection unit, the second detection unit, the third detection unit, the first measurement unit, the second measurement unit, and the determination unit according to the above-described embodiment may include a CPU (Central Processing Unit; A computer device including a central processing unit) 301, a main memory unit 302, an external memory unit 303, and a network connection unit 304, etc., and the CPU 301 is controlled by a program developed in the main memory unit. By operation (executing a program), each of the above-described functions (abnormality determination method) can also be realized. The program is a program for a computer to execute the abnormality determination method shown in the above-described embodiment. The network connection device 304 connects to the network 305. In addition, each function can also be distributed over a plurality of computer devices.

Further, in the above-described embodiment, the calculation unit, the first detection unit, the second detection unit, the third detection unit, the first measurement unit, the second measurement unit, and the determination unit are programmable logic devices such as field-programmable gate array (FPGA). It is also possible to configure by (PLD: Programmable Logic Device). For example, the above-described functions can be executed by providing each of a calculation unit, a first detection unit, a second detection unit, a third detection unit, a first measurement unit, a second measurement unit, and a determination unit as circuits in the logic element of the FPGA. Each of the calculation circuit, the first detection circuit, the second detection circuit, the third detection circuit, the first measurement circuit, the second measurement circuit, and the determination circuit can record in the FPGA by connecting a predetermined recording device. Further, each of the circuits recorded in the FPGA can be confirmed by a recording device connected to the FPGA.

As described above, according to the present invention, the state in which the first detection unit detects that the measured temperature exceeds the first value, and the second detection unit detects that the heating rate exceeds the second value If the continuous time is measured and the time to be measured exceeds the preset first timer setting value, it is judged as abnormal, so that the ability of the heater can be sufficiently utilized within a range that does not cause damage to the heater.

In addition, it is clear that the present invention is not limited to the embodiments described above, and many modifications and combinations can be implemented by those of ordinary skill in the relevant field within the technical idea of the present invention. For example, in addition to the alarm shown in the above-described embodiment, an alarm may be issued when the measured temperature exceeds the set value. Also, when the current flowing through the heater exceeds a set value, an alarm can be issued. In addition, if the voltage applied to the heater exceeds a set value, an alarm can be issued. By increasing the number of monitoring items, it can function as a more robust load protection function.

101 heater, 102 measurement unit 103 calculation unit 104 first detection unit 105 second detection unit 106 first measurement unit 107 determination unit 108 output unit 120 determination value storage unit 121 : Control unit.

Claims (8)

As a temperature controller that controls the heating ability of the heater and controls the temperature of the control object to a preset set temperature,
A measuring unit configured to measure the temperature of the heater,
A calculation unit configured to obtain a change in temperature increase per unit time of the heater measured by the measurement unit as a temperature increase rate,
A first detection unit configured to detect that the measurement temperature measured by the measurement unit exceeds a preset first value,
A second detection unit configured to detect that the heating rate obtained by the calculation unit exceeds a preset second value,
The first detection unit detects that the measured temperature exceeds the first value, and the second detection unit measures a time period during which the state in which the temperature increase rate exceeds the second value is detected. A configured first measurement unit,
A determination unit configured to determine an abnormality when the time measured by the first measurement unit exceeds a preset first time,
An output unit that outputs an alarm when the determination unit determines that it is abnormal
A temperature controller comprising a. The method of claim 1,
A third detection unit configured to detect that the measurement temperature measured by the measurement unit exceeds a preset third value higher than the first value,
The third detection unit detects that the measured temperature exceeds the third value, and the second detection unit measures a time period during which the state in which the temperature increase rate exceeds the second value is detected Configured second measurement unit
Further comprising,
The determination unit determines that the temperature is abnormal when the time measured by the first measurement unit exceeds the first time or when the time measured by the second measurement unit exceeds a preset second time. Regulator. The method of claim 1,
A third detection unit configured to detect that the measurement temperature measured by the measurement unit exceeds a preset third value higher than the first value,
A fourth detection unit configured to detect that the heating rate obtained by the calculation unit exceeds a preset fourth value different from the second value,
The third detection unit detects that the measured temperature exceeds the third value, and the fourth detection unit measures a time period during which the state in which the temperature increase rate exceeds the fourth value is detected. Configured second measurement unit
Further comprising,
The determination unit determines that the temperature is abnormal when the time measured by the first measurement unit exceeds the first time or when the time measured by the second measurement unit exceeds a preset second time. Regulator. The method according to claim 2 or 3,
The temperature controller, characterized in that the first time and the second time are the same. A first step of obtaining the measured temperature rise change per unit time of the heater as a temperature rise rate,
A second step of detecting that the measured temperature of the heater exceeds a preset first value,
A third step of detecting that the heating rate obtained in the first step exceeds a preset second value;
In the second step, it is detected that the measured temperature exceeds the first value, and in the third step, measuring a time during which the state in which the temperature rising rate exceeds the second value is detected. Step 4,
The fifth step of determining that the time measured in the fourth step is abnormal if it exceeds the first preset time
An abnormality determination method comprising a. The method of claim 5,
A sixth step of detecting that the measured temperature exceeds a preset third value higher than the first value,
In the sixth step, it is detected that the measured temperature exceeds the third value, and in the third step, measuring a time period during which the state in which the temperature increase rate exceeds the second value is detected. Step 7 and,
The eighth step of determining that it is abnormal if the time measured in the seventh step exceeds a second preset time
An abnormality determination method, characterized in that it further comprises. The method of claim 5,
A sixth step of detecting that the measured temperature exceeds a preset third value higher than the first value,
A seventh step of detecting that the heating rate obtained by the first step exceeds a preset fourth value different from the second value,
The sixth step detects that the measurement temperature exceeds the third value, and the seventh step measures a time period during which the state in which the temperature increase rate exceeds the fourth value is detected. Step 8 and,
The ninth step of determining that the time measured in the eighth step is abnormal if it exceeds the second preset time
An abnormality determination method, characterized in that it further comprises. The method according to claim 6 or 7,
The abnormality determination method, characterized in that the first time and the second time are the same.

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