JP2012173757A - Temperature control device and temperature control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a temperature control device for achieving flexible temperature control in a device.SOLUTION: A temperature control device includes a plurality of temperature control parts 100. Each of the plurality of temperature control parts 100 includes: a cooling fan 109; a temperature measurement part 102 which measures temperature; a temperature history part 103 which stores the values of a plurality of measured temperatures in a time series; and a control part 110 which sets a first temperature read from among the values of the plurality of measured temperatures as a reproduction threshold temperature, and controls the cooling fan so that a first measured temperature to be measured by the temperature measurement part 102 after the first temperature is set can match the first temperature.

Description

  The present invention relates to a temperature control device that controls the temperature inside a computer.

  The computer includes a temperature control device for controlling the internal temperature. In general, the temperature control device includes a plurality of temperature abnormality detection units that detect temperature abnormality inside the computer based on a predetermined threshold, and is provided in the computer when one temperature abnormality detection unit detects the temperature abnormality. In addition, the number of rotations of all the cooling fans is increased at once, and the temperature inside the computer is lowered. When no temperature abnormality is detected, the temperature control device controls the cooling fan so as to reduce the rotational speed.

Patent Documents 1 to 4 are disclosed as techniques related to computer temperature control.
Patent Document 1 can perform cooling only for a specific heat generating object, and efficiently generates a heat generating object without providing a hole in the structure housed in the housing or changing the shape of the structure. Disclosed is a computer cooling device that enables cooling. The cooling device for a computer of Patent Document 1 includes an air inlet provided close to a heat generating object housed in a housing, a flexible air introduction duct having one end connected to the air inlet, and the other end of the flexible air introduction duct. And a cooling fan that is connected and exhausted toward the outside of the housing.

  Patent Document 2 discloses a temperature control device for heat treatment equipment capable of reliably heat-treating an object to be heat-treated with a desired temperature profile. The temperature control device for the heat treatment facility of Patent Document 2 is disposed in the vicinity of the heater disposed in the heat treatment facility, the measurement temperature sensor disposed in the vicinity of the object to be heat treated in the heat treatment facility, and the heater. A control temperature sensor, a heater driving means for driving the heater, a set temperature profile data storage means for storing a desired set temperature profile, and a heater so as to follow the desired temperature profile based on the output of the measurement temperature sensor The history data storage means for storing the history data of the output of the control temperature sensor when driving the battery, and the history data stored in the history data storage means are regarded as the set temperature profile, and the heater drive means is controlled to follow this And a heater control means.

  Patent Document 3 discloses an operation control device in which an operation program and recorded data coexist while reducing the number of used flash memories, and the operation program does not stop even when data is written to the flash memory. Disclosure. The operation control device of Patent Document 3 operates an apparatus according to a predetermined operation program, and stores an operation program and can record data in an operation control apparatus capable of recording the operation state of the apparatus as data. A flash memory, a RAM capable of recording an operation program, a copying means for copying the operation program recorded in the flash memory to the RAM, and reading the operation program copied by the copying means, and following the program It is characterized by chanting driving control means for driving listening.

  Patent Document 4 discloses a fan motor drive circuit that starts stably when the fan motor is started and always controls rotation of the fan motor by temperature control. Patent Document 4 discloses a fan motor driving circuit used for a personal computer or the like, a fan motor starting circuit for starting a fan motor by applying a rated voltage, and a temperature for controlling a voltage applied to the fan motor in accordance with an ambient temperature. A control circuit, and a switching circuit that switches between a fan motor starting circuit and a temperature control circuit are provided.

JP-A-7-020966 Japanese Patent Laid-Open No. 10-206020 JP-A-10-307759 JP-A-11-015567

  If a computer failure occurs due to temperature, a reproducibility test will be performed to identify the suspected location. However, in this reproduction test, it is difficult for a computer equipped with the above-described temperature control device to bring the internal temperature close to the same temperature environment as when the failure occurred. This is because when the temperature inside the computer is brought close to the temperature environment at the time of the failure, if a temperature detection unit different from the temperature detection unit that detected the failure detects a temperature that exceeds the threshold first, the temperature at the time of the failure will be This is because the number of rotations of all the cooling fans in the computer rises before it becomes close to the temperature environment at the time of failure.

  An object of the present invention is to provide a temperature control device capable of realizing flexible temperature control in the device.

  A temperature control apparatus is provided as a first aspect of the present invention. The temperature control device of the present invention includes a plurality of temperature control units. Each of the plurality of temperature control units includes a cooling fan, a temperature measurement unit that measures temperature, a temperature history unit that stores a plurality of measured temperature values in time series, and a plurality of measured temperature values. Control for setting the first temperature read from the inside as the reproduction threshold temperature and controlling the cooling fan so that the first measured temperature measured by the temperature measurement unit after setting the first temperature matches the first temperature A part.

  As another aspect of the present invention, a temperature control method is provided. The temperature control method of the present invention is a temperature control method executed by the temperature control device, and the temperature control device includes a plurality of temperature control units. Each of the plurality of temperature control units includes a cooling fan, a temperature measurement unit that measures a temperature, a temperature history unit that stores a plurality of measured temperature values in time series, and a control unit. The temperature control method includes a step of reading a first temperature from a plurality of measured temperature values, a step of setting the first temperature as a reproduction threshold temperature, and a measurement by a temperature measurement unit after setting the first temperature. And controlling the cooling fan so that the first measured temperature coincides with the first temperature.

  The present invention can provide a temperature control device capable of realizing flexible temperature control in the device. Therefore, it becomes possible to reproduce a temperature state closer to the time of occurrence of a failure in a failure reproduction test caused by a temperature abnormality in the apparatus.

FIG. 1A is a diagram illustrating a configuration of a temperature control device according to an embodiment of the present invention. FIG. 1B is a diagram illustrating a configuration of a temperature control device according to the embodiment of the present invention. FIG. 2 is a flowchart showing the operation of the temperature control device in the normal mode in the embodiment of the present invention. FIG. 3 is a flowchart showing the operation of the temperature control device in the reproduction mode according to the embodiment of the present invention.

  A temperature control apparatus according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[Description of configuration]
First, the configuration of the temperature control device in the present embodiment will be described. 1A and 1B are diagrams showing a configuration of a temperature control device in the present embodiment. The temperature control device includes temperature control units 100-1 to 100-n, a mode switching unit 200, a temperature failure detection unit 300, and an instruction input unit 400. The mode switching unit 200, the temperature failure detection unit 300, and the instruction input unit 400 are connected to each of the temperature control units 100-1 to 100-n.

  A plurality of temperature control units 100-1 to 100-n are provided inside the computer, and control the temperature inside the computer by controlling the rotation speed of the cooling fan. The mode switching unit 200 controls switching between the normal mode and the reproduction mode in the temperature control units 100-1 to 100-n. The normal mode is a mode in which the inside of the computer is controlled to an appropriate temperature by the temperature control units 100-1 to 100-n. The reproduction mode is a mode in which the temperatures recorded in the temperature control units 100-1 to 100-n are reproduced inside the computer. The temperature failure detection unit 300 detects a failure caused by temperature in the computer (hereinafter, temperature failure). For example, a correctable fault may occur in the memory, processor, etc. as the temperature in the computer rises, and the temperature fault detector 300 detects such a fault. The instruction input unit 400 receives an instruction input from a user of the temperature control device.

  Since the temperature control units 100-1 to 100-n have the same configuration, the temperature control unit 100-1 will be described below as an example. The temperature control unit 100-1 includes an abnormal temperature threshold setting unit 101, a temperature measurement unit 102, a temperature history unit 103, a selector 104, a cooling fan 109, and a control unit 110.

  The cooling fan 109 cools a cooling target exemplified by a CPU (Central Processing Unit). The abnormal temperature threshold setting unit 101 stores a temperature (hereinafter referred to as a normal threshold temperature) that serves as a threshold for detecting a temperature abnormality inside the computer in the normal mode. The temperature measuring unit 102 measures the temperature. The temperature history unit 103 is configured by a nonvolatile memory exemplified by a flash memory. The temperature history unit 103 stores values of temperatures measured by the temperature measurement unit 2 (hereinafter, measured temperatures) in time series in the normal mode. In response to an instruction from the instruction input unit 400, the temperature history unit 103 starts writing the measured temperature, and stops receiving the measured temperature when receiving a temperature failure notification from the temperature failure detecting unit 300. Further, in the reproduction mode, the temperature history unit 103 outputs the measured temperature stored in time series as a temperature (hereinafter referred to as a reproduction threshold temperature) serving as a threshold used for controlling the rotation speed of the cooling fan 109. The selector 104 selects the normal threshold temperature input from the abnormal temperature threshold setting unit 101 or the reproduction threshold temperature input from the temperature history unit 103 under the control of the mode switching unit 200, and outputs it to the control unit 110. The selector 104 is controlled to select the normal threshold temperature input from the abnormal temperature threshold setting unit 101 in the normal mode, and to select the reproduction threshold temperature input from the temperature history unit 103 in the reproduction mode.

  The control unit 110 includes a threshold value determination unit 105, an OR circuit 106, a selector 107, and a cooling fan control unit 108. 1A and 1B, the OR circuit 106 is provided only in the temperature control unit 100-1, but other temperature control units 100-2 to 100-n may be provided, or all temperature control units may be provided. The units 100-1 to 100-n may be provided.

  The threshold determination unit 105 sets the normal threshold temperature or the reproduction threshold temperature from the selector 104 as the threshold temperature, and compares it with the measurement temperature input from the temperature measurement unit 102. In the normal mode, the threshold determination unit 105 sets the normal threshold temperature input from the selector 104 as the threshold temperature, and compares it with the measured temperature input from the temperature measurement unit 102. The threshold determination unit 105 outputs a temperature abnormality signal when the measured temperature is equal to or higher than the normal threshold temperature. In the reproduction mode, the threshold determination unit 105 sets the reproduction threshold temperature input from the selector 104 as the threshold temperature, and compares whether the measured temperature input from the temperature measurement unit 102 matches the threshold temperature. When the measured temperature matches the reproduction threshold temperature, the threshold determination unit 105 notifies the temperature history unit 103 of the threshold temperature match. On the other hand, the threshold determination unit 105 outputs a cooling fan control signal when the measured temperature does not match the reproduction threshold temperature. For example, the threshold determination unit 105 outputs a high level cooling fan control signal when the measured temperature is equal to or higher than the reproduction threshold temperature, and outputs a low level cooling fan control signal when the measured temperature is less than the reproduction threshold temperature. And so on.

  The OR circuit 106 is connected to all the threshold determination units 105 and selectors 107 of the temperature control units 100-1 to 100-n. The logical sum circuit 106 receives the temperature abnormality signal from at least one threshold determination unit 105 of the temperature control units 100-1 to 100-n, and sends the temperature abnormality signal to all the selectors 107 of the temperature control units 100-1 to 100-n. Output. Thereby, the occurrence of temperature abnormality in at least one temperature control unit 100-1 to 100-n is notified to all temperature control units 100-1 to 100-n.

  The selector 107 selects a cooling fan control signal input from the threshold value determination unit 105 or a temperature abnormality signal input from the OR circuit 106 under the control of the mode switching unit 200 and outputs the selected signal to the cooling fan control unit 108. The selector 107 is controlled to select the temperature abnormality signal input from the OR circuit 106 in the normal mode, and to select the cooling fan control signal input from the threshold value determination unit 105 in the reproduction mode.

  When the temperature abnormality signal is input from the selector 107 in the normal mode, the cooling fan control unit 108 controls the rotation speed of the cooling fan 109 based on the temperature abnormality signal. The cooling fan control unit 108 inputs a cooling fan control signal from the selector 107 in the reproduction mode, and controls the rotation speed of the cooling fan 109 based on the cooling fan control signal. For example, when the cooling fan control unit 108 inputs a high-level cooling fan control signal when the measured temperature is equal to or higher than the reproduction threshold temperature from the threshold determination unit 105, the cooling fan control unit 108 controls to increase the rotational speed of the cooling fan 109. For example, when a low-level cooling fan control signal is input from the threshold determination unit 105 when the measured temperature is lower than the reproduction threshold temperature, the rotation speed of the cooling fan 109 is controlled to decrease.

  The above is description of the structure of the temperature control apparatus in this embodiment.

[Description of operation]
Next, the operation of the temperature control device in this embodiment will be described. First, the operation of the temperature control device in the normal mode will be described. FIG. 2 is a flowchart showing the operation of the temperature control device in the normal mode in the present embodiment. Since temperature control devices 100-1 to 100-n perform the same operation, temperature control unit 100-1 will be described as an example unless otherwise specified.

  The mode switching unit 200 controls the selectors 104 and 107 of the temperature control devices 100-1 to 100-n to shift to the normal mode. Therefore, the selectors 104 of the temperature control devices 100-1 to 100-n select the normal threshold temperature input from the abnormal temperature threshold setting unit 101 and output it to the threshold determination unit 105. Further, the selectors 107 of the temperature control units 100-1 to 100-n select the temperature abnormality signal input from the OR circuit 106 and output it to the cooling fan control unit 108.

  In such a state, first, the instruction input unit 400 outputs the temperature writing instruction input by the user to the temperature history unit 103 of the temperature control units 100-1 to 100-n (step S10). The temperature measuring unit 102 periodically measures the temperature and outputs it as a measured temperature (step S20). The temperature measurement unit 102 may always perform temperature measurement regularly, or may start temperature measurement after inputting an instruction from the user from the instruction input unit 400. The temperature history unit 103 starts writing the measured temperature when the temperature writing instruction is input. The temperature history unit 103 stores the measured temperatures periodically measured by the temperature measuring unit 102 in time series (step S30).

  The threshold determination unit 105 inputs the normal threshold temperature from the abnormal temperature threshold setting unit 101 via the selector 104 and sets it as the threshold temperature. When the measured temperature is input from the temperature measuring unit 102, the threshold determining unit 105 compares whether the measured temperature is equal to or higher than the threshold temperature (step S40). When the measured temperature is equal to or higher than the threshold temperature (Yes in step S50), the threshold determination unit 105 detects a temperature abnormality and outputs a temperature abnormality signal.

  When the temperature OR signal is input from any of the temperature control units 100-1 to 100-n, the OR circuit 106 outputs the temperature error signal to all the selectors 107 of the temperature control units 100-1 to 100-n. As described above, the selectors 107 of the temperature control units 100-1 to 100-n select the temperature abnormality signal input from the OR circuit 106 and output it to the cooling fan control unit 108. All the cooling fan control units 108 of the temperature control units 100-1 to 100-n control the cooling fan 109 to rotate at a high speed when an abnormal temperature signal is input from the selector 107. Accordingly, when the temperature is abnormal, all the cooling fans 109 in the computer rotate at a high speed, and the temperature in the computer is lowered (step S60).

  On the other hand, when the measured temperature is not equal to or higher than the threshold temperature (No in step S50), the threshold determination unit 105 does not output a temperature abnormality signal. Therefore, the cooling fan control unit 108 controls the cooling fan 109 to the low speed rotation that is the normal rotation speed (step S70). Note that the number of rotations of the cooling fan 109 at high speed and low speed is not limited to a specific value. The specific rotation speed is appropriately set according to conditions such as the environment inside the computer.

  The temperature failure detection unit 300 determines whether a temperature failure has been detected inside the computer (step S80). If no temperature failure is detected (No in step S80), the flow returns to step S20. In this way, based on the determination by the threshold determination unit 105, the cooling fan 109 maintains high speed rotation when a temperature abnormality occurs, and maintains low speed rotation when no temperature abnormality occurs.

  On the other hand, when a temperature failure is detected (Yes in step S80), the temperature history unit 103 stops writing the measured temperature in response to a notification from the temperature failure detection unit 300. As a result, this operation flow ends. Note that control of the cooling fan 109 may be continued in a state where writing of the measured temperature is stopped. Alternatively, the measurement temperature may be continuously written to record the time at which the temperature failure is detected.

  The above is the description of the operation of the temperature control device in the normal mode. In this manner, the temperature history units 103 of the temperature degree control units 100-1 to 100-n use the measured temperature measured by the temperature measurement unit 102 until the temperature failure is detected in the temperature failure detection unit 300 in the normal mode. The measured temperature is stored in time series.

  Next, the operation of the temperature control device in the reproduction mode will be described. FIG. 3 is a flowchart showing the operation of the temperature control device in the reproduction mode according to this embodiment.

  The mode switching unit 200 controls the selectors 104 and 107 of the temperature control devices 100-1 to 100-n to shift to the reproduction mode (step S100). As a result, the selectors 104 of the temperature control devices 100-1 to 100-n select the reproduction threshold temperature input from the temperature history unit 103 and output it to the threshold determination unit 105. Further, the selectors 107 of the temperature control units 100-1 to 100-n select the cooling fan control signal input from the threshold value determination unit 105 and output it to the cooling fan control unit 108.

  When shifting to the reproduction mode, the temperature history unit 103 of the temperature control devices 100-1 to 100-n outputs the measured temperature stored in time series in the normal mode to the selector 104 in time series as a reproduction threshold temperature (step S110). . The threshold determination unit 105 of the temperature control devices 100-1 to 100-n inputs the reproduction threshold temperature from the temperature history unit 103 via the selector 104 and sets it as the threshold temperature (step S120).

  The temperature measuring units 102 of the temperature control devices 100-1 to 100-n periodically measure the temperature and output it as a measured temperature (step S130). The temperature measurement unit 102 may always perform temperature measurement regularly, or may start temperature measurement after inputting an instruction from the user from the instruction input unit 400.

  When the measured temperature is input from the temperature measuring unit 102, the threshold value determining unit 105 of the temperature control devices 100-1 to 100-n compares whether the measured temperature matches the threshold temperature (step S140). If the measured temperature does not match the threshold temperature (No in step S150), the threshold determination unit 105 outputs a cooling fan control signal so that the measured temperature matches the threshold temperature, and the cooling fan control unit 108 causes the cooling fan 109 to output the cooling fan control signal. Is controlled (step S160).

  For example, the threshold determination unit 105 outputs a high level cooling fan control signal when the measured temperature is equal to or higher than the threshold temperature, and outputs a low level cooling fan control signal when the measured temperature is less than the threshold temperature. Then, when the high level cooling fan control signal is input from the threshold determination unit 105, the cooling fan control unit 108 performs control to increase the rotation speed of the cooling fan 109, and the low level cooling fan control signal from the threshold determination unit 105. Is input so that the number of rotations of the cooling fan 109 is controlled to decrease. Thus, by controlling the cooling fan 109 of the temperature control units 100-1 to 100-n, the temperature inside the computer is controlled to coincide with the threshold temperature. After this, the flow returns to step S130.

  On the other hand, when the measured temperature matches the threshold temperature (Yes in step S150), the threshold determination unit 105 notifies the temperature measurement history unit 103 that the threshold temperature matches. In response to the notification that the threshold temperatures match, the temperature history unit 103 reads the next stored measured temperature from the measured temperatures stored in time series (step S170). At this time, the temperature history unit 103 determines whether or not the next stored measured temperature exists (step S170), and if the next stored measured temperature does not exist (No in step S170), this operation is performed. The flow ends. In other words, at this time, the inside of the computer is in a temperature environment when a temperature failure occurs.

  On the other hand, if the next stored measurement temperature exists (Yes in step S170), the next stored measurement temperature is read out from the measurement temperatures stored in time series, and is output to the selector 104 as a reproduction threshold temperature. To do. The temperature control devices 100-1 to 100-n threshold value determination unit 105 inputs the reproduction threshold temperature from the temperature history unit 103 via the selector 104, and updates the threshold temperature (step S180). After this, the flow returns to step S130. Then, the threshold determination unit 105 controls the cooling fan control unit 108 with the cooling fan control signal so that the measured temperature matches the newly set threshold temperature. The above is the description of the operation of the temperature control device in the reproduction mode.

  According to the temperature control device of the present invention, in the reproduction mode, the threshold value determination unit 105 of the temperature control units 100-1 to 100-n sequentially sets the measured temperature stored in the temperature history unit 103 in time series as the threshold temperature. Then, the threshold determination unit 105 controls the cooling fan control unit 108 with the cooling fan control signal so that the temperature inside the computer matches the newly set threshold temperature. When the measured temperature matches the threshold temperature, the threshold determination unit 105 updates the threshold temperature to the next stored measured temperature.

  In this way, the temperature control units 100-1 to 100-n individually control the cooling fans 109 so that the measured temperatures stored in time series coincide with the measured temperatures that are the current internal temperature of the computer. Therefore, flexible temperature control inside the computer is possible. Therefore, it is possible to more accurately reproduce the temperature environment inside the computer from before the temperature failure occurs until the temperature failure occurs, and to improve the reproducibility of the temperature failure.

  The user can write various measured temperature values in time series in advance in each of the temperature history units 103 of the temperature control units 100-1 to 100-n via the instruction input unit 400. It is also possible to simulate the environment. For example, by writing a high measurement temperature in the temperature history unit 103 of the temperature control units 100-1 to 100-n, it becomes possible to always maintain a higher temperature than usual. Therefore, it is possible to perform a high temperature test without a dedicated high temperature test facility.

100-1 to n Temperature control unit 101 Abnormal temperature threshold setting unit 102 Temperature measurement unit 103 Temperature history unit 104 Selector 105 Threshold determination unit 106 OR circuit 107 Selector 108 Cooling fan control unit 109 Cooling fan 110 Control unit 200 Mode switching unit 300 Temperature fault detection unit 400 Instruction input unit

Claims (9)

A plurality of temperature control units,
Each of the plurality of temperature controllers is
A cooling fan,
A temperature measuring unit for measuring the temperature;
A temperature history section for storing a plurality of measured temperature values in time series;
A first temperature read from the measured plurality of temperature values is set as a reproduction threshold temperature, and the first measurement temperature measured by the temperature measurement unit after setting the first temperature is And a controller that controls the cooling fan so as to coincide with the first temperature. The temperature control device according to claim 1,
When the first measured temperature matches the first temperature, the control unit sets the second temperature next to the first temperature as the reproduction threshold temperature along the time series, and sets the second temperature. A temperature control device that controls the cooling fan so that a second measured temperature that is later measured by the temperature measurement unit matches the second temperature. The temperature control device according to claim 1 or 2, wherein
For the plurality of temperature control units, further comprising a mode switching unit for setting one of a reproduction mode for reproducing a temperature environment and a normal mode for performing temperature control,
The temperature history unit stores, in time series, the third measured temperature measured by the temperature measurement unit in the normal mode. The temperature control device according to claim 3,
Each of the plurality of temperature controllers is
A threshold storage unit for storing a normal threshold temperature for determining an abnormality in the normal mode;
The control unit reads the normal threshold temperature in the normal mode, and controls the cooling fan so that the third measured temperature falls below the normal threshold temperature when the third measured temperature is equal to or higher than the normal threshold temperature. Yes Temperature control device. The temperature control device according to claim 3 or 4,
It further comprises a temperature fault detection unit for detecting a fault caused by temperature,
The temperature history unit stops storage of the third measured temperature when the temperature failure detection unit detects the temperature failure in the normal mode. The temperature control device according to any one of claims 3 to 5,
The controller is
A threshold determination unit that compares the first temperature and the first measurement temperature, the second temperature and the second measurement temperature, or the normal threshold temperature and the third measurement temperature;
A cooling fan control unit that controls the cooling fan based on a comparison result by the threshold value determination unit;
The cooling fan control unit controls the cooling fan so that the third measured temperature falls below the normal threshold temperature when the third measured temperature is equal to or higher than the normal threshold temperature in the normal mode, A temperature control device that controls the cooling fan so that the first measured temperature coincides with the first temperature or the second measured temperature coincides with the second temperature in the reproduction mode. The temperature control device according to claim 6,
The first control unit provided in the first temperature control unit among the plurality of temperature control units,
In the normal mode, a first comparison result is input from the threshold value determination unit of each of the plurality of temperature control units, and the third measured temperature is equal to or higher than the normal threshold temperature in at least one of the first comparison results. In this case, a temperature control device includes an OR circuit that outputs a second comparison result indicating that the measured temperature is equal to or higher than the normal threshold temperature to the cooling fan control unit of each of the plurality of temperature control units. The temperature control device according to claim 7,
Each of the temperature controllers is
In the normal mode, the normal threshold temperature of the threshold storage unit is selected, and in the reproduction mode, the first temperature or the second temperature of the temperature history unit is selected and output to the threshold determination unit. 1 selector further,
The controller is
A second selector that selects the second comparison result of the logical sum circuit in the normal mode, selects the comparison result of the threshold determination unit in the reproduction mode, and outputs the comparison result to the cooling fan control unit; Provide temperature control device. A plurality of temperature control units,
Each of the plurality of temperature control units includes a cooling fan, a temperature measurement unit that measures a temperature, a temperature history unit that stores a plurality of measured temperature values in time series, and a control unit. The temperature control method of
The controller reads out a first temperature from the measured plurality of temperature values;
The controller sets the first temperature as a reproduction threshold temperature;
And a step of controlling the cooling fan so that a first measured temperature measured by the temperature measuring unit coincides with the first temperature after the control unit sets the first temperature.

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