CN111949053B - Temperature regulator and abnormality determination method - Google Patents
Temperature regulator and abnormality determination method Download PDFInfo
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- CN111949053B CN111949053B CN202010289191.3A CN202010289191A CN111949053B CN 111949053 B CN111949053 B CN 111949053B CN 202010289191 A CN202010289191 A CN 202010289191A CN 111949053 B CN111949053 B CN 111949053B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
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- Control Of Temperature (AREA)
Abstract
A temperature regulator and an abnormality determination method are provided, which can fully exert the capability of a heater within a range that does not cause the damage of the heater. A calculation unit (103) obtains the temperature rise change per unit time of the heater (101) measured by the measurement unit (102) as a temperature rise rate. A first detection unit (104) detects that the measurement temperature measured by the measurement unit (102) exceeds a preset first value. A second detection unit (105) detects that the temperature increase rate obtained by the calculation unit (103) exceeds a second value set in advance. A first measurement unit (106) measures the time during which a state in which the first detection unit (104) detects that the measured temperature exceeds a first value and a state in which the second detection unit (105) detects that the temperature increase rate exceeds a second value continue. When the time measured by the first measuring unit (106) exceeds a preset first time, the determining unit (107) determines that the abnormality has occurred.
Description
Technical Field
The present invention relates to a temperature regulator for controlling the temperature of a controlled object and an abnormality determination method.
Background
A temperature controller for controlling the temperature of various temperature environments or the like displays the temperature of a monitoring target detected by a temperature sensor such as a thermocouple or a temperature measuring resistor, and obtains a control output to a heater based on the detected temperature and a set temperature to control the temperature of the monitoring target.
Further, since the heater is damaged by an erroneous operation, the following alarm setting and control output setting are generally performed for a device such as a thermostat that controls the heater (see patent documents 1 and 2). The heater user uses these functions to output an alarm and limit the current flowing through the heater.
The temperature is monitored so as not to be higher than a temperature specified by the manufacturer of the heater (upper temperature limit alarm).
The temperature change rate is monitored so as not to exceed a temperature increase rate specified by the heater manufacturer (temperature change rate alarm).
The upper limit of the control value (MV value) of the thermostat is monitored, and when the upper limit exceeds the alarm upper limit, an alarm is issued (MV value upper limit alarm).
The upper limit (control value upper limit) of the control value (MV value) is set so that the thermostat does not generate an output more than necessary (control value upper limit setting).
The current flowing through the heater is measured, and an alarm (overcurrent alarm) is issued when a current equal to or higher than a set value flows.
[ Prior art documents ]
[ patent document ]
[ patent document 1] Japanese patent application laid-open No. Hei 09-243098
[ patent document 2] Japanese patent application laid-open No. Hei 01-298385
Disclosure of Invention
Problems to be solved by the invention
As described above, the heater may be broken due to an operation error. For example, when the temperature is to be raised at a temperature change rate of not less than a rated value (for example, 100 ℃/s), the heater is damaged. The temperature change rate is different in characteristics depending on each kind of the heater, and the specification related to the temperature change rate is indicated by the manufacturer of the heater. The heater characteristics may vary depending on the temperature, and the temperature change rate may vary depending on the temperature range, but most of the specifications related to the temperature change rate, which are designated by the manufacturer of the heater, are representative values that can be safely used in the entire temperature range. Therefore, even if the specification relating to the temperature change rate indicated by the heater manufacturer is 50 ℃/s, for example, but is practically 200 ℃ or lower, the heater is not damaged even at 80 ℃// heater.
Further, as the characteristics of the heater, even if the temperature is changed to a predetermined temperature change rate or more, if the time for the change is short, the deterioration may not be achieved. For example, even if the specification relating to the temperature change rate indicated by the manufacturer of the heater is 50 ℃/s, if the time of 80 ℃/s is 10 seconds or less, the heater will not be damaged.
A typical temperature change rate alarm is set based on a temperature change rate indicated by the manufacturer of the heater. When the set value is exceeded, the thermostat outputs an alarm, and the output MV value is reduced (set to 0%, for example). However, since the limit of such control is set based on the temperature change rate indicated by the manufacturer of the heater, the heater may not be damaged even if the limit is exceeded, depending on the temperature of the heater or the time during which the temperature change rate exceeds the upper limit. When the heater is used without causing damage even if the temperature exceeds the limit, the heater may be used within the above range, thereby improving the controllability of the temperature.
As described above, although the heater can be prevented from being broken, there is a problem that the heater capacity is not sufficiently exhibited.
The present invention has been made to solve the above-described problems, and an object thereof is to sufficiently exhibit the capability of a heater within a range that does not cause damage to the heater.
Means for solving the problems
A temperature controller according to the present invention controls heating capacity of a heater to control a temperature of a control target to a preset set temperature, the temperature controller including: a measuring unit configured to measure a temperature of the heater; a calculation unit configured to calculate a temperature rise change per unit time of the heater measured by the measurement unit as a temperature rise 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 temperature increase rate obtained by the calculation unit exceeds a second value set in advance; a first measuring unit configured to measure a time during which a state in which the first detecting unit detects that the measured temperature exceeds a first value and a state in which the second detecting unit detects that the temperature increase rate exceeds a second value continue; a determination unit configured to determine that the first measurement unit is abnormal when the time measured by the first measurement unit exceeds a preset first time; and an output unit that outputs an alarm when the determination unit determines that the abnormality has occurred.
In one configuration example of the temperature regulator, the temperature regulator further includes: 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 a second measuring unit configured to measure a time during which the third detecting unit detects that the measured temperature exceeds a third value and the second detecting unit detects that the temperature increase rate exceeds a second value, and the determining unit determines that the abnormality occurs when the time measured by the first measuring unit exceeds the first time or the time measured by the second measuring unit exceeds a preset second time.
In one configuration example of the temperature regulator, the temperature regulator further includes: 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 temperature increase rate obtained by the calculation unit exceeds a preset fourth value different from the second value; and a second measuring unit configured to measure a time during which the third detecting unit detects that the measured temperature exceeds a third value and the fourth detecting unit detects that the temperature increase rate exceeds a fourth value, and the determining unit determines that the abnormality occurs when the time measured by the first measuring unit exceeds a first time or the time measured by the second measuring unit exceeds a second time set in advance.
In one embodiment of the temperature regulator, the first time period is the same as the second time period.
The abnormality determination method of the present invention includes: a first step of obtaining a temperature rise change per unit time of the heater measured 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 temperature increase rate obtained in the first step exceeds a second value set in advance; a fourth step of measuring a duration of a state in which it is detected in the second step that the measured temperature exceeds the first value, and in the third step that the rate of temperature rise exceeds the second value; and a fifth step of determining that the time measured in the fourth step is abnormal when the time exceeds a preset first time.
In an embodiment of the abnormality determination method, the method further includes: a sixth step of detecting that the measured temperature exceeds a preset third value higher than the first value; a seventh step of measuring a time during which a state in which it is detected in the sixth step that the measured temperature exceeds the third value and in which it is detected in the third step that the temperature increase rate exceeds the second value; and an eighth step of determining that the time measured in the seventh step exceeds a second time set in advance.
In an embodiment of the abnormality determination method, the method further includes: a sixth step of detecting that the measurement temperature measured by the measurement unit exceeds a preset third value higher than the first value; a seventh step of detecting that the temperature increase rate obtained in the first step exceeds a preset fourth value higher than the second value; an eighth step of measuring a time during which the sixth step detects that the measured temperature exceeds the third value and the seventh step detects that the temperature increase rate exceeds the fourth value; and a ninth step of determining that the time measured in the eighth step exceeds a second time set in advance.
In one embodiment of the abnormality determination method, the first time is the same as the second time.
ADVANTAGEOUS EFFECTS OF INVENTION
As described above, according to the present invention, since the time during 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 is measured, and when the measured time exceeds the preset first time, it is determined that the temperature is abnormal, the capability of the heater can be sufficiently exhibited within a range in which the heater is not damaged.
Drawings
Fig. 1 is a configuration diagram showing a configuration of a temperature regulator according to embodiment 1 of the present invention.
Fig. 2 is a flowchart for explaining the abnormality determination method according to embodiment 1 of the present invention.
Fig. 3 is a configuration diagram showing a configuration of a temperature regulator according to embodiment 2 of the present invention.
Fig. 4 is a flowchart for explaining an abnormality determination method according to embodiment 2 of the present invention.
Fig. 5 is a configuration diagram showing a configuration of a temperature regulator according to embodiment 3 of the present invention.
Fig. 6 is a flowchart for explaining an abnormality determination method according to embodiment 3 of the present invention.
Fig. 7 is a block 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 a temperature regulator according to an embodiment of the present invention.
[ description of symbols ]
101: heating device
102: measuring part
103: calculating part
104: first detecting part
105: second detecting part
106: a first measuring part
107. 107a, 107 b: determination unit
108: output unit
109: third detecting part
110. 110 a: second measuring part
120: judgment value storage unit
121: control unit
301：CPU
302: main storage device
303: external storage device
304: network connection device
305: network
S101 to S109, S112 to S119, S123, S124, S126, S127, S131: step (ii) of
Detailed Description
Hereinafter, a temperature control meter according to an embodiment of the present invention will be described.
[ embodiment 1]
First, a temperature control meter according to embodiment 1 of the present invention will be described with reference to fig. 1. The temperature controller controls the heating capacity of the heater 101 to control the temperature of the control target to a preset temperature. The temperature controller includes a measuring unit 102, a calculating unit 103, a first detecting unit 104, a second detecting unit 105, a first measuring unit 106, a determining unit 107, an output unit 108, a determination value storing unit 120, and a control unit 121.
The measuring 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, which heats the control target, based on the relationship between the measured temperature measured by the measuring unit 102 and the set temperature.
The calculation unit 103 obtains the temperature increase change 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 measured temperature measured by the measurement unit 102 exceeds a preset first value stored in the determination value storage unit 120. For example, 250 ℃ may be set as the first value. The second detection unit 105 detects that the temperature increase rate obtained by the calculation unit 103 exceeds a second value set in advance. For example, 50 ℃/sec may be set as the second value.
The first measurement unit 106 measures the time during which the first detection unit 104 detects that the measured temperature exceeds the first value and the second detection unit 105 detects that the temperature increase rate exceeds the second value. The determination unit 107 determines that there is an abnormality when 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 may be set to 2 seconds, for example. When the determination unit 107 determines that there is an abnormality, the output unit 108 outputs an alarm. For example, the occurrence of an abnormality is displayed on a display unit not shown. In addition, a speaker, or the like is used to give a notification by sound or the like as an alarm.
For example, conventionally, when the specification relating to the rate of temperature change indicated by the manufacturer of the heater is 50 ℃/s, 50 ℃/s is set as a determination value of the temperature increase rate obtained from the measured temperature. Therefore, when the temperature increase rate obtained from the measured temperature becomes 50 ℃/s or more, an alarm is issued, and a limit is imposed such that the control value to be output to the heater 101 is 0.
In such abnormality avoidance control, for example, if the heater 101 is practically 200 ℃ or less, the heater is not damaged even at 80 ℃/s, and even when used in a low temperature range in which the heating temperature is less than 200 ℃, the temperature rise rate cannot be set to 50 ℃/s or more. On the other hand, in such a heat treatment, for example, when the temperature increase rate is increased, the treatment time can be shortened.
In contrast, according to embodiment 1, for example, if the heating temperature is lower than 250 ℃, it is not determined that there is an abnormality even if the temperature increase rate is 50 ℃/s or more. Even if the heating temperature is 250 ℃ or higher, if the time for which the temperature increase rate is 50 ℃/s or higher is 9 seconds or less, it is not determined that there is an abnormality. Therefore, according to embodiment 1, the temperature increase rate can be further increased, and the processing time can be shortened. For example, by using a heater that can be used at a higher temperature increase rate, the temperature increase rate can be further increased even in the conventional control using a rated value, and the processing time can be shortened. However, such a high-speed temperature-increasing heater is expensive and causes an increase in cost. In contrast, according to embodiment 1, an expensive heater is not required. As described above, according to embodiment 1, the capacity of the heater 101 can be sufficiently exhibited within a range in which the heater is not damaged.
Next, an operation example (abnormality determination method) of the temperature controller according to embodiment 1 will be described with reference to a flowchart of fig. 2.
First, in step S101, the calculation unit 103 obtains a measured temperature increase change 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 exceeds a preset first value stored in the determination value storage unit 120 (second step). When the first detection unit 104 detects that the measured temperature exceeds the first value (yes in step S102), the second detection unit 105 detects in step S103 that the obtained temperature increase rate exceeds a preset second value stored in the determination value storage unit 120 (third step).
When the second detection unit 105 detects that the temperature increase rate exceeds the second value (yes in step S103), in step S104, it is determined whether or not the first measurement unit 106 has started measuring the time during which the state in which the temperature increase rate exceeds the second value continues. If the time measurement is not started (no in step S104), in step S105, first measurement unit 106 starts measuring the time during which a state in which the measured temperature exceeds the first value and the temperature increase rate exceeds the second value is detected (fourth step), and the process proceeds to step S106. In addition, 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 setting value (first time) stored in the determination value storage unit 120 (fifth step). When the measured time exceeds the first timer setting value (yes in step S106), the first measurement unit 106 stops (ends) the measurement of the time in step S107, and the determination unit 107 determines that the time is abnormal in step S108 (fifth step). The time measurement is continued while the measured temperature is detected to exceed the first value and the temperature increase rate is detected to exceed the second value (steps S101 to S106). When the determination unit 107 determines that there is an abnormality, an abnormality processing (jumping to an abnormal operation amount, issuing an alarm, etc.) is performed in step S109. After the exception processing, the state is maintained until the release operation is performed in step S131.
[ embodiment 2]
Next, a temperature control meter according to embodiment 2 of the present invention will be described with reference to fig. 3. The temperature controller controls the heating capacity of the heater 101 to control the temperature of the control target to a preset temperature. The 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, a determination value storage unit 120, and a control unit 121. These portions are the same as those in embodiment 1 described above.
Embodiment 2 further includes: a preset third value, which is higher than the first value and is used as a threshold value for measuring the temperature; a first time suitable for being used as a first timer set value when the measured temperature is more than a first value and less than a third value; and a second time which is suitable for being used as a second timer set value when the measured temperature is more than a third value. These third value and second timer setting value (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 setting value (first time). In embodiment 2, for example, 100 ℃ may be set as the first value, 50 ℃/sec may be set as the second value (temperature increase rate threshold), and 250 ℃ may be set as the third value.
In embodiment 2, the determination unit 107a determines that the abnormality occurs when the time measured by the first measurement unit 106 exceeds a first timer setting value or the time measured by the second measurement unit 110 exceeds a second timer setting value set in advance. In embodiment 2, the first timer setting value may be set to 3 seconds, for example, and the second timer setting value may be set to 2 seconds. The first timer setting value and the second time may be set to the same value.
In embodiment 2, as in embodiment 1 described above, the capacity of the heater 101 can be sufficiently exhibited within a range in which the heater is not damaged. In embodiment 2, time references for determining abnormality may be set in each of the two temperature ranges. Therefore, for example, in a lower temperature range, the criterion of the determination time for abnormality can be further extended, and for example, a more rapid temperature rise can be realized. In the above, the determination criterion for the measured temperature is set to both the first value and the third value, but the present invention is not limited thereto, and three or more determination criteria for the measured temperature may be set.
Next, an operation example (abnormality determination method) of the temperature controller according to embodiment 2 will be described with reference to a flowchart of fig. 4. Note that the abnormality determination based on the first timer setting value using the first value and the second value is the same as that in embodiment 1 described above, and the description thereof will be omitted below.
First, in step S101, the calculation unit 103 obtains a measured temperature increase change 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 heater 101 is equal to or higher than the first value and lower than the third value, which are set in advance (yes in step S112), the first timer setting value (first time) is selected from the determination value storage unit 120 and set as the timer setting value (step S113). Then, the process proceeds to step S103.
On the other hand, when the first detection unit 104 detects that the measured temperature is equal to or higher than the third value (yes in step S114), the second timer setting value (second time) is selected from the determination value storage unit 120 and set as the timer setting value (step S115). Next, in step S103, the second detection unit 105 detects that the temperature increase rate exceeds a second value set in advance.
When the second detection unit 105 detects that the temperature increase rate exceeds the second value (yes in step S103), in step S104, it is determined whether or not the first measurement unit 106 has started measuring the time during which the state in which the temperature increase rate exceeds the second value continues. If the time measurement is not started (no in step S104), in step S115, the second measurement unit 110 starts measuring the time during which a state in which the measured temperature exceeds the third value and the temperature increase rate exceeds the second value is detected (seventh step), and the process proceeds to step S116. In addition, 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 a preset second timer setting value (second time). When the measured time exceeds the second timer setting value (yes in step S116), the second measurement unit 110 stops (ends) the measurement of the time in step S117, and the determination unit 107a determines that it is abnormal in step S118 (eighth step). The time measurement is continued while the measured temperature is detected to exceed the third value and the temperature increase rate is detected to exceed the second value (steps S101 to S116). When the determination unit 107a determines that there is an abnormality, an abnormality processing (a jump to an abnormal operation amount, an alarm output by the output unit 108, etc.) is performed in step S119. After the exception processing, the state is maintained until the release operation is performed in step S131.
[ embodiment 3]
Next, a temperature control meter according to embodiment 3 of the present invention will be described with reference to fig. 5. The temperature controller controls the heating capacity of the heater 101 to control the temperature of the control target to a preset temperature. The 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, a determination value storage unit 120, and a control unit 121. These portions are the same as those in embodiment 1 described above.
Embodiment 3 further includes: a preset third value, which is higher than the first value and is used as a threshold value for measuring the temperature; a second value suitable as a temperature increase rate threshold value when the measured temperature is equal to or higher than the first value and lower than a third value; and a fourth value which is suitable as a temperature increase rate threshold value when the measured temperature is equal to or higher than the third value. In embodiment 3, for example, 100 ℃ may be set as the second value, and 250 ℃ may be set as the third value.
Further, embodiment 3 includes: the second measuring unit 110a measures the time during which the third detecting unit 109 detects that the measured temperature exceeds the third value and the fourth detecting unit 111 detects that the temperature increase rate exceeds the fourth value. For example, 80 ℃/sec may be set as the second value, and 50 ℃/sec may be set as the fourth value. The fourth value is also stored in the determination value storage unit 120 in the same manner as the first value, the second value, the third value, the first timer setting value (first time), and the second timer setting value (second time).
In embodiment 3, the determination unit 107b determines that there is an abnormality when the time measured by the first measurement unit 106 exceeds a first timer set value (first time) or the time measured by the second measurement unit 110a exceeds a second timer set value (second time) set in advance. In embodiment 3, the first timer setting value and the second timer setting value may be set to 3 seconds. In embodiment 3, the first timer setting value may be set to 3 seconds, for example, and the second timer setting value may be set to 2 seconds.
In embodiment 3, as in embodiment 1 described above, the capacity of the heater 101 can be sufficiently exhibited within a range in which the heater is not damaged. In embodiment 3, both the second value and the fourth value may be prepared, and the reference of the temperature increase rate for determining abnormality may be set in each of the two temperature ranges. Therefore, for example, in a lower temperature range, the reference of the temperature increase rate considered to be abnormal can be set to a higher value, and for example, a more rapid temperature increase can be realized. In the above, the determination criterion for the measured temperature is set to both the first value and the third value, but the present invention is not limited thereto, and three or more determination criteria for the measured temperature may be set. Accordingly, three or more temperature increase rate criteria for determining an abnormality may be set.
Next, an operation example (abnormality determination method) of the temperature controller according to embodiment 3 will be described with reference to a flowchart of fig. 6.
First, in step S101, the calculation unit 103 obtains a measured temperature increase change 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 heater 101 is equal to or higher than the first value and lower than the third value (yes in step S112), the first timer setting value (first time) is selected from the determination value storage unit 120 and set as the timer setting value (step S123), and the second value is selected from the determination value storage unit 120 and set as the temperature increase rate threshold (step S124). Then, the process proceeds to step S103.
On the other hand, when the first detection unit 104 detects that the measured temperature is equal to or higher than the third value (yes in step S114), the second timer setting value (second time) is selected from the determination value storage unit 120 and set as the timer setting value (step S126), and the fourth value is selected from the determination value storage unit 120 and set as the temperature increase rate threshold (step S127).
When the fourth detection unit 111 detects that the temperature increase rate exceeds the fourth value (yes in step S113), in step S104, it is determined whether or not the first measurement unit 106 has started measuring the time during which the measurement temperature exceeds the third value and the temperature increase rate exceeds the fourth value. If the time measurement is not started (no in step S104), in step S105, the second measurement unit 110a starts measuring the time during which a state in which the measured temperature exceeds the third value and the temperature increase rate exceeds the fourth value is detected (eighth step), and the process proceeds to step S116. In addition, when the time measurement has started (yes in step S104), the process proceeds to step S116.
Next, in step S116, the determination unit 107b determines whether or not the measured time exceeds a second timer setting value set in advance as a timer setting value (ninth step). When the measured time exceeds the second timer setting value (yes in step S116), the second measuring unit 110a stops (ends) the measurement of the time in step S117, and the determination unit 107b determines that the time is abnormal in step S118 (ninth step). The time measurement is continued while the measured temperature is detected to exceed the third value and the temperature increase rate is detected to exceed the fourth value (steps S101 to S116). When the determination unit 107b determines that there is an abnormality, the output unit 108 issues (outputs) an alarm as an abnormality process in step S119. In addition, the operation ends when an end instruction is input (yes in step S131).
The first value (temperature reference) may be 250 ℃, the upper limit of the temperature increase rate may be 80 ℃/s when the measured temperature is lower than 250 ℃, and the upper limit of the temperature increase rate may be 50 ℃/s when the measured temperature is 250 ℃ or higher. The first value may be 100 ℃, the third value may be 250 ℃, the upper limit of the temperature increase rate may be 80 ℃/s when the measured temperature is lower than 100 ℃, the upper limit of the temperature increase rate may be 50 ℃/s when the measured temperature is 100 ℃ or higher and lower than 250 ℃, and the upper limit of the temperature increase rate may be 40 ℃/s when the measured temperature is 250 ℃ or higher.
When the measured temperature is lower than 100 ℃, the upper limit of the temperature increase rate may be set to 80 ℃/s, and the time for determination may be set to, for example, 3 s. When the measured temperature is 100 ℃ or higher and less than 250 ℃, the upper limit of the temperature increase rate may be 50 ℃/s, and the time for determination may be, for example, 2 s. When the measured temperature is 250 ℃ or higher, the upper limit of the temperature increase rate may be 40 ℃/s, and the time for determination may be 1s, for example.
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 of the temperature regulator according to the above-described embodiment may be a computer device including a Central Processing Unit (CPU) 301, a main storage device 302, an external storage device 303, a network connection device 304, and the like, and the functions (abnormality determination method) described above may be implemented by the CPU 301 operating (executing) according to a program developed in the main storage device. The program is a program for causing a computer to execute the abnormality determination method shown in the above-described embodiment. The network connection device 304 is connected to a network 305. In addition, the functions may be distributed among a plurality of computer apparatuses.
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 of the temperature adjustment meter according to the above-described embodiments may include a Programmable Logic Device (PLD) such as a Field-Programmable Gate Array (FPGA). For example, the above-described functions can be performed by making the logic element of the FPGA include each of 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 in the form of a circuit. 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 may be connected to a predetermined write device and may be written to the FPGA. Further, each of the circuits written in the FPGA may be confirmed by a writing device connected to the FPGA.
As described above, according to the present invention, since the time during 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 is measured, and when the measured time exceeds the first timer set value set in advance, it is determined that there is an abnormality, the capacity of the heater can be sufficiently exhibited within a range in which the heater is not damaged.
It is to be understood that the present invention is not limited to the above-described embodiments, and various modifications and combinations can be made by those having ordinary knowledge in the art within the technical spirit of the present invention. For example, in addition to the alarm described in the above embodiment, an alarm may be issued when the measured temperature becomes a set value or more. In addition, an alarm may be issued when the current flowing through the heater exceeds a set value. Further, an alarm may be issued when the voltage applied to the heater exceeds a set value. It is also possible to add monitoring items to function as a more robust load protection function.
Claims (5)
1. A temperature controller for controlling a heating capacity of a heater to control a temperature of a control target to a preset set temperature, the temperature controller comprising:
a measuring unit configured to measure a temperature of the heater;
a calculation unit configured to calculate a temperature rise change per unit time of the heater measured by the measurement unit as a temperature rise 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 temperature increase rate obtained by the calculation unit exceeds a second value set in advance;
a third detection unit configured to detect that the measurement temperature measured by the measurement unit exceeds a preset third value that is higher than the first value;
a first measuring unit configured to measure a time during which the first detecting unit detects that the measured temperature exceeds the first value and the second detecting unit detects that the temperature increase rate exceeds the second value;
a second measuring unit configured to measure a time during which the third detecting unit detects that the measured temperature exceeds the third value and the second detecting unit detects that the temperature increase rate exceeds the second value;
a determination unit configured to determine that the abnormality occurs when the time measured by the first measurement unit exceeds a first time set in advance or the time measured by the second measurement unit exceeds a second time set in advance; and
and an output unit that outputs an alarm when the determination unit determines that the abnormality has occurred.
2. A temperature controller for controlling a heating capacity of a heater to control a temperature of a control target to a preset set temperature, the temperature controller comprising:
a measuring unit configured to measure a temperature of the heater;
a calculation unit configured to calculate a temperature rise change per unit time of the heater measured by the measurement unit as a temperature rise 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 temperature increase rate obtained by the calculation unit exceeds a second value set in advance;
a third detection unit configured to detect that the measurement temperature measured by the measurement unit exceeds a preset third value that is higher than the first value;
a fourth detection unit configured to detect that the temperature increase rate obtained by the calculation unit exceeds a preset fourth value different from the second value;
a first measuring unit configured to measure a time during which the first detecting unit detects that the measured temperature exceeds the first value and the second detecting unit detects that the temperature increase rate exceeds the second value;
a second measuring unit configured to measure a time during which the third detecting unit detects that the measured temperature exceeds the third value and the fourth detecting unit detects that the temperature increase rate exceeds the fourth value;
a determination unit configured to determine that the abnormality occurs when the time measured by the first measurement unit exceeds a first time set in advance or the time measured by the second measurement unit exceeds a second time set in advance; and
and an output unit that outputs an alarm when the determination unit determines that the abnormality has occurred.
3. The temperature conditioner according to claim 1 or 2,
the first time is the same as the second time.
4. An abnormality determination method includes:
a first step of obtaining a temperature rise change per unit time of the heater measured 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 temperature increase rate obtained in the first step exceeds a second value set in advance;
a fourth step of measuring a duration of a state in which it is detected in the second step that the measured temperature exceeds the first value, and in which it is detected in the third step that the temperature increase rate exceeds the second value;
a fifth step of judging that the time measured in the fourth step is abnormal when the time exceeds a preset first time;
a sixth step of detecting that the measured temperature exceeds a preset third value higher than the first value;
a seventh step of measuring a time during which it is detected in the sixth step that the measured temperature exceeds the third value, and it is detected in the third step that the temperature increase rate exceeds the second value; and
an eighth step of determining that the time measured in the seventh step is abnormal when the time exceeds a second time set in advance.
5. The abnormality determination method according to claim 4,
the first time is the same as the second time.
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