JPH0863238A - Temperature controller - Google Patents

Abstract

PURPOSE: To reduce energy loss by suppressing an overshoot at the time of actuation and making a temperature control system settle quickly. CONSTITUTION: When the temperature controller is actuated, overshoot temperature is set by an overshoot temperature setting part 6 and heating device OFF set temperature is set by a heating device OFF temperature setting part 7; when in-container temperature detected by a temperature sensor reaches the heating device OFF set temperature, a heating device operation part 8 stops a heating device and a heating device OFF set temperature correction part compares with the measured overshoot temperature in a container with the overshoot set temperature and adds the temperature deviation to the heating device OFF set temperature when there is the temperature deviation to re-set new heating device OFF set temperature in the heating device OFF temperature setting part 7. Thus, the heating device OFF temperature can automatically be corrected so that the measured overshoot temperature approximates the overshoot set temperature each time the controller is actuated repeatedly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature control device for controlling the temperature of a space such as a furnace, a container, a chamber, and a can, and more particularly to a temperature control device for controlling an overshoot or undershoot time at start-up.

[0002]

2. Description of the Related Art Generally, a furnace using a plurality of heating devices,
A temperature control device that performs temperature control to keep the heating temperature of a space such as a container, a chamber, and a can (hereinafter, represented by the name of “container” here) constant is as shown in FIG. That is, a plurality of heating devices 2, 2, ... Are installed in the container 1, the temperature signal detected by the temperature sensor 3 in the container 1 is compared with a temperature set value, and the heating devices 2, 2 are selected according to the temperature deviation.
The control device 4 controls the increase / decrease of the number of operating vehicles 2 ,.

Conventionally, such a temperature control device has a temperature control characteristic as shown in FIG. 10 for the purpose of raising the temperature in the container 1 to a predetermined target temperature Tsv as quickly as possible at the time of startup. It was That is, first, at the time ts, all the heating devices 2, 2, ... Are turned on at the same time and raised to a predetermined heating device off temperature Tp, and at the time tp, all the heating devices 2, 2 ,. As a result, the inside of the container 1 overshoots to the temperature Tos due to residual heat, and then the temperature gradually starts decreasing. Therefore, the temperature control device 4 determines that the temperature inside the container 1 is the control target temperature T.
When the temperature decreases to sv, the generally performed unit number control is executed so that the control target temperature Tsv is maintained.

[0004]

However, such a conventional temperature control device has the following problems. That is, as shown in FIG. 10, the overshoot target temperature Ts at the time of startup is set, the actual temperature in the container 1 is raised to the overshoot target temperature Ts, and then the normal unit number control is performed. If all the heating devices 2, 2, ... Are turned off when the temperature in the container 1 reaches a certain temperature, all the heating devices 2, 2 ,.
The temperature at which the internal temperature reaches the overshoot target temperature Ts, that is, the heating device OFF set temperature Tp is set based on the past results.

However, when the start-up heating is actually performed, variations in the characteristics of the environment, the heating device, the container, and the like have an influence, so that the heating devices 2, 2, and 2 are reached at the time when the heating device OFF set temperature is reached. Even if all are turned off, the overshoot target temperature Ts does not necessarily become,
The actual overshoot temperature Tos may be reached. When the actual overshoot temperature exceeds the overshoot target temperature Ts as described above, it takes extra time for the temperature in the container 1 to cool down to the control target temperature Tsv, and there is a problem that the startup time becomes long. There has been a problem that a large amount of energy is wasted to operate the heating device.

A temperature control device for cooling the inside of a container with a plurality of cooling devices to maintain the target temperature also takes an extra time to undershoot during start-up cooling and to return to the control target temperature. There was a problem that the startup cooling time was too long, and there was also a problem that energy wasted a lot.

The present invention has been made in view of the above problems of the prior art, and it is possible to shorten the start-up heating and cooling times, reduce energy waste, and perform efficient temperature control. An object is to provide a control device.

[0008]

According to a first aspect of the present invention, in a temperature control device for controlling the temperature inside a container by controlling ON / OFF of a heating device, a temperature sensor for detecting the temperature inside the container and an overheat at the time of start-up heating. An overshoot temperature setting unit for setting a shoot temperature, and at the time of start-up heating, if the heating device is stopped when the temperature inside the container reaches a certain set temperature, it is predicted that the temperature inside the container will reach a predetermined overshoot temperature. Heating device off temperature setting unit that sets the set temperature as the heating device off set temperature, a heating device operation unit that stops the heating device when the temperature inside the container detected by the temperature sensor reaches the heating device off set temperature, and the temperature Overshoot actual temperature in the container detected by the sensor and overshoot set temperature of the overshoot temperature setting section And a heating device off set temperature correction unit for adding the temperature deviation to the heating device off set temperature set in the heating device off temperature setting unit and resetting to a new heating device off set temperature. It is a thing.

According to a second aspect of the present invention, in a temperature control device for controlling the temperature inside the container by controlling on / off of the cooling device, a temperature sensor for detecting the temperature inside the container and an undershoot temperature for setting the undershoot temperature at the time of startup cooling are set. Chute temperature setting part, and during startup cooling, if the cooling device is stopped when the temperature inside the container reaches a certain set temperature, it is predicted that the temperature inside the container will reach the predetermined undershoot temperature. Cooling device off temperature setting part set as set temperature, cooling device operation part to stop the cooling device when the temperature inside the container detected by the temperature sensor reaches the cooling device off set temperature, inside the container detected by the temperature sensor The undershoot actual temperature of the Adding degrees deviation cooler off temperature setting unit is set to the cooling device off setting temperature, in which a cooling device off setting temperature correction unit to reconfigure to the new cooling system off set temperature.

[0010]

According to the temperature control device of the present invention, when the startup heating is executed, the overshoot temperature is set by the overshoot temperature setting part, and the heating device off set temperature is set by the heating device off temperature setting part. Set it up,
The heating device operation unit stops the heating device when the temperature inside the container detected by the temperature sensor reaches the heating device OFF set temperature. Then, the heating device off set temperature correction unit compares the actual overshoot temperature in the container with the overshoot set temperature, and if there is a temperature deviation, adds the temperature deviation to the heating device off set temperature and adds new heating. The device-off temperature is reset in the heating device-off temperature setting section.

In this way, the heating device off temperature can be automatically corrected so that the actual overshoot temperature approaches the overshoot set temperature each time the startup heating is repeated.

In the temperature control device according to the second aspect of the present invention, when executing the start-up cooling, the undershoot temperature is set by the undershoot temperature setting part, and the cooling device off set temperature is set by the cooling device off temperature setting part. The cooling device operating unit stops the cooling device when the temperature inside the container detected by the temperature sensor reaches the cooling device off set temperature. Then, the cooling device off set temperature correction unit compares the undershoot actual temperature in the container with the undershoot set temperature, and if there is a temperature deviation, adds the temperature deviation to the cooling device off set temperature to generate new cooling. The cooling-off temperature setting unit is reset as the cooling-off setting temperature.

In this manner, the cooling device off temperature can be automatically corrected so that the actual undershoot temperature approaches the undershoot set temperature each time the startup cooling is repeated.

[0014]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a functional block diagram of an embodiment of the invention of claim 1, and a temperature control device 4 of this embodiment uses a heating device 2, which controls the temperature of a general heating container 1 as shown in FIG.
2, ... By controlling the number of units, the temperature signal from the temperature sensor 3 in the container 1 is input to obtain the actual temperature T in the container.
Sensor temperature input section 5 for detecting the temperature, overshoot temperature setting section 6 for setting the overshoot temperature at the time of start-up heating, and heating device 2, when the actual temperature in container 1 reaches a certain set temperature at the time of start-up heating. Two
Is stopped, the actual temperature in the container 1 is predicted to reach a predetermined overshoot temperature. The heating device OFF temperature setting unit 7 that sets the set temperature as the heating device OFF set temperature, and the temperature sensor 3 detects the temperature. When the actual temperature in the container 1 reaches the heating device OFF set temperature, the heating device 2, 2,
, The overshoot actual temperature in the container 1 detected by the temperature sensor 3 and the overshoot set temperature of the overshoot temperature setting section 6 are compared, and the temperature deviation is compared with the heating device off temperature. A temperature correction calculation unit 9 that adds to the heating device OFF set temperature set in the setting unit 7 and resets the heating device OFF set temperature to a new heating device OFF set temperature, these overshoot set temperatures, and the heating device turned OFF several times in the past. The temperature storage unit 10 stores the set temperature, the actual temperature in the container, the actual overshoot temperature, and the like, and the unit number control unit 11 that controls the number of the heating devices 2, 2, ... In normal temperature control.

Next, the operation of the temperature control device having the above structure will be described. FIG. 3 is a flowchart of the startup temperature control operation of the temperature control device of this embodiment, and FIG. 4 shows the temperature control characteristics. First, the overshoot temperature setting unit 6 sets the overshoot target temperature Ts, and the heating device off temperature setting unit 7 sets the heating device off temperature Tp.
Is set as an initial value and registered in the temperature storage unit 10.

When the temperature control is started at the time ts (step S1), the heating device operating section 8 causes the total heating device 2,
2, are turned on, start-up heating is started, and the temperature inside the container 1 is raised (steps S2 and S3).

The heating device operating section 8 periodically monitors the temperature signal input from the sensor temperature input section 5, and detects the temperature T in the container.
Repeatedly determines whether or not the heating device OFF set temperature Tp has been reached (step S4). When the temperature T in the container reaches the heating device OFF set temperature Tp at time tp, all the heating devices 2, 2, ... Are turned off (step S
5).

After that, since the temperature inside the container 1 rises due to the residual heat and overshoot occurs, the transition of the temperature T inside the container 1 is stored in the temperature storage unit 10. At the same time, the time t when the time for the overshoot to settle has elapsed.
The unit number control unit 11 starts unit number control at 0, and the heating device 2 is controlled according to the temperature deviation between the actual temperature T and the control target temperature Tsv so that the actual temperature T in the container 1 becomes the control target temperature Tsv. , 2, ... Controls the number of units on / off.

When one heating operation is completed, the temperature correction calculation unit 9 is activated and the overshoot actual temperature Tos at the present start-up time stored in the temperature storage unit 10 is read to obtain the overshoot target. Temperature T
s to obtain the temperature deviation ΔT (step S
6) The value Th obtained by subtracting the temperature deviation ΔT from the current heating device OFF set temperature Tp is obtained (step S7).
That is, ΔT = Tos−Ts Th = Tp−ΔT is calculated.

The temperature correction calculation unit 9 stores these calculation results in the temperature storage unit 10 and reads out the heating device OFF set temperature Tpi from the temperature storage unit 10 for a fixed number of times n times before the previous startup. Then, the average value Tp 'of these heating device off set temperature Tpi and the newly obtained heating device off set temperature correction value Th
Is calculated (step S8), this is stored in the temperature storage unit 10 as a new heating device off set temperature Tp, and the set temperature of the heating device off temperature setting unit 7 is updated (step S9).

That is, Tp 'is obtained based on the following equation,
The control data is updated so that this will be the heating device OFF set temperature Tp (← Tp ′) at the next startup.

[0022]

[Equation 1] Here, while the number of startups does not reach n, the first set temperature Tp is stored as the heating device OFF set temperature up to n, and a new set temperature Tp ′ obtained every time the number of startups is repeated. Will be replaced with.

As a result, at the next start-up, the heating device off temperature Tp is set so that the actual overshoot temperature does not become higher than the previous time, and the first overshoot characteristic of the curve A shown in FIG. The overshoot characteristic is improved so that the overshoot characteristic is obtained.

The above-mentioned improvement of the overshoot characteristic will be described with reference to FIGS. 5 and 6. By repeatedly updating the correction data by the learning temperature control based on the past start-up performance data, the temperature control start-up is performed. The target overshoot temperature Ts and the actual value Tosi (i = 1, 2, ...) As the number of times increases.
The temperature deviation ΔT between and gradually decreases and eventually converges to zero.

Accordingly, as shown in the temperature characteristic of FIG. 6, the actual overshoot value T shown in the first characteristic diagram A0.
When the second startup is performed with the heating device OFF set temperature Tp1 at the next startup obtained based on os0, the characteristic diagram becomes A1.
The characteristic diagram at the time of the next start-up obtained based on the overshoot actual value Tos1 of 1 is as shown in A2, and in the following, based on the overshoot actual value of the characteristic diagram at the previous startup, By setting the heating device OFF set temperature, it is possible to obtain a temperature characteristic that converges to the target overshoot temperature Ts each time the number of times of startup is increased.

In this way, in the temperature control device of this embodiment, the timing for turning off the heating device at the time of start-up of temperature control is based on the difference between the target temperature of the overshoot and the average value of the actual temperature of the overshoot. Since the heating device off set temperature at the next startup is automatically corrected every time, the actual overshoot value can be brought closer to the target temperature each time the number of startups is repeated. It is possible to prevent variations in chute characteristics, improve operational reliability, shorten the time until the temperature control system stabilizes, reduce power consumption, and improve productivity.

Next, an embodiment of the invention of claim 2 will be described with reference to FIGS. The temperature control device of this embodiment is characterized by the temperature control of the cooling device, contrary to the temperature control of the container by the heating device of the first embodiment. Therefore, the temperature control system is the same as that shown in FIG. 2, but instead of the heating device, the cooling devices 2, 2, ...
The difference is that you use. And the temperature control device 4
Has a configuration as shown in FIG.

The temperature control device 4 inputs a temperature signal from a temperature sensor 3 for detecting the temperature inside the container 1,
Sensor temperature input unit 21 for obtaining actual temperature data inside, undershoot temperature setting unit 22 for setting undershoot temperature during start-up cooling, and cooling when temperature inside container 1 reaches a certain set temperature during start-up cooling When the devices 2, 2, ... Are stopped, the temperature inside the container 1 is predicted to reach a predetermined undershoot temperature. A cooling device off temperature setting unit 23 that sets the set temperature as a cooling device off set temperature, and a temperature sensor. 3 detecting containers 1
The cooling device operating part 24 for stopping the cooling devices 2, 2, ... When the internal temperature reaches the cooling device OFF set temperature, and the undershoot actual temperature and undershoot temperature setting in the container 1 detected by the temperature sensor 3 A temperature correction for comparing the undershoot set temperature of the unit 22 and adding the temperature deviation to the cooling unit off set temperature set in the cooling unit off temperature setting unit 23 to reset to a new cooling unit off set temperature. The calculation unit 25, the temperature storage unit 26 that stores the undershoot set temperature, the cooling device off set temperature of the past several times, the actual temperature in the container, the actual undershoot temperature, and the like, and the cooling device 2 in the normal temperature control. 2, a unit number control unit 27 that controls the number of units.

Next, the operation of the temperature controller having the above structure will be described. FIG. 8 is a flowchart of the startup temperature control operation of the temperature control device of this embodiment, and FIG. 9 shows the temperature control characteristics. First, the undershoot target temperature Ts is set by the undershoot temperature setting unit 22, and the cooling device off temperature T is set by the cooling device off temperature setting unit 23.
p is set as an initial value and registered in the temperature storage unit 26.

When the temperature control is started at time ts (step S21), the cooling device operating section 24 turns on all the cooling devices 2, 2, ..., Starts up the cooling and lowers the temperature inside the container 1 (step S21). S22, S23).

The cooling device operating unit 24 is the sensor temperature input unit 2
The temperature signal input from 1 is periodically monitored, and it is repeatedly determined whether the container internal temperature T has reached the cooling device off set temperature Tp (step S24). When the in-container temperature T reaches the cooling device off set temperature Tp at time tp, all the cooling devices 2, 2, ... Are turned off (step S25).

After that, since the temperature inside the container 1 is lowered by the residual cooling heat and undershoot occurs, the transition of the temperature T inside the container 1 is stored in the temperature storage unit 26. At the same time, the number-of-units control unit 27 starts the number-of-units control at time to when the undershoot settling time has elapsed, and the actual temperature T and the control target temperature Tsv are set so that the actual temperature T in the container 1 becomes the control target temperature Tsv. The on / off number of cooling devices 2, 2, ... Is controlled according to the magnitude of the temperature deviation.

When one cooling operation is completed, the temperature correction calculation unit 25 is activated and the undershoot actual temperature Tus at the start-up time stored in the temperature storage unit 26 is read to obtain the undershoot target. The temperature deviation ΔT is calculated by comparing with the temperature Ts (step S2
6) Then, a value Th obtained by adding the temperature deviation ΔT from the current cooling device OFF set temperature Tp is obtained (step S27).
That is, ΔT = Ts−Tus Th = Tp + ΔT is calculated.

The temperature correction calculation unit 25 stores these calculation results in the temperature storage unit 26, and reads the cooling device OFF set temperature Tpi at the startup for a fixed number of times n from the temperature storage unit 26 to the previous startup. Then, the average value Tp 'of these cooling device off set temperature Tpi and the cooling device off set temperature correction value Th newly obtained this time.
Is calculated (step S28), this is stored as a new cooling device off set temperature Tp in the temperature storage unit 26, and the set temperature of the cooling device off temperature setting unit 23 is updated (step S29).

That is, Tp 'is obtained based on the following equation,
The control data is updated so that this will be the cooling device off set temperature Tp (← Tp ′) at the next startup.

[0036]

[Equation 2] Here, while the number of startups does not reach n, the first set temperature Tp is stored as the cooling device OFF set temperature up to n, and a new set temperature Tp ′ obtained every time the number of startups is repeated. Will be replaced with.

As a result, at the next startup, the cooling device off temperature Tp is set so that the actual undershoot temperature does not become lower than that of the previous time, and the first undershoot characteristic of the curve C shown in FIG. The undershoot characteristic is improved so that the undershoot characteristic is obtained.

In this way, in the temperature control device of this embodiment, the timing for turning off the cooling device at the time of startup of temperature control is based on the difference between the target temperature of the undershoot and the average value of the actual temperature of the undershoot. Since the cooling device off set temperature at the next start-up is automatically corrected every time, the actual undershoot value can be brought closer to the target temperature each time the number of start-ups is repeated. It is possible to prevent variations in chute characteristics, improve operational reliability, shorten the time until the temperature control system stabilizes, reduce power consumption, and improve productivity.

[0039]

As described above, according to the invention of claim 1,
When performing start-up heating, set the overshoot temperature in the overshoot temperature setting section, and set the heating device off set temperature in the heating device off temperature setting section so that the temperature inside the container detected by the temperature sensor is When the heating device off set temperature is reached, the heating device operation unit stops the heating device, and the heating device off set temperature correction unit compares the overshoot actual temperature in the container with the overshoot set temperature, and there is a temperature deviation. In that case, the temperature deviation is added to the heating device off set temperature, the new heating device off set temperature is reset in the heating device off temperature setting section, and it is used for the next startup, so the startup heating is repeated. The overheat temperature of the heating device is automatically compensated so that the actual overshoot temperature approaches the overshoot set temperature. It is possible to prevent significant overshoot and variation in overshoot characteristics, improve operational reliability, and reduce the time until the temperature control system settles down to reduce power consumption and production. It is possible to improve the sex.

According to the second aspect of the present invention, when executing the start-up cooling, the undershoot temperature is set by the undershoot temperature setting section, and the cooling device off set temperature is set by the cooling device off temperature setting section. The cooling device operation unit stops the cooling device when the temperature inside the container detected by the temperature sensor reaches the cooling device off set temperature. The temperature is compared with the chute set temperature, and if there is a temperature deviation, that temperature deviation is added to the cooling device off set temperature, and it is reset as a new cooling device off set temperature in the cooling device off temperature setting section, and the next startup The undershoot actual temperature approaches the undershoot set temperature each time the start-up cooling is repeated. As described above, it is possible to automatically correct the cooling device off temperature, prevent significant undershoot and variations in undershoot characteristics, improve operational reliability, and reduce the time until the temperature control system stabilizes. It can be shortened to reduce power consumption and improve productivity.

[Brief description of drawings]

FIG. 1 is a functional block diagram of an embodiment of the invention of claim 1;

FIG. 2 is a block diagram of a general temperature control system.

FIG. 3 is a flowchart showing a heating device OFF set temperature correction process of the above embodiment.

FIG. 4 is a graph showing the temperature characteristics of the above embodiment.

FIG. 5 is a graph showing operating characteristics of the above embodiment.

FIG. 6 is a graph showing temperature characteristics of the above embodiment.

FIG. 7 is a functional block diagram of an embodiment of the invention of claim 2;

FIG. 8 is a flowchart showing a cooling device OFF set temperature correction process of the above embodiment.

FIG. 9 is a graph showing the temperature characteristics of the above embodiment.

FIG. 10 is a graph showing temperature characteristics of a conventional example.

[Explanation of symbols]

 1 Container 2 Heating Device (Cooling Device) 3 Temperature Sensor 4 Temperature Control Device 5 Sensor Temperature Input Unit 6 Overshoot Temperature Setting Unit 7 Heating Device Off Temperature Setting Unit 8 Heating Device Operating Unit 9 Temperature Correction Calculation Unit 10 Temperature Storage Unit 11 Number of Units Control unit 21 Sensor temperature input unit 22 Undershoot temperature setting unit 23 Cooling device off temperature setting unit 24 Cooling device operating unit 25 Temperature correction calculation unit 26 Temperature storage unit 27 Number control unit

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location G05B 11/18 D 7531-3H

Claims (2)

[Claims] 1. A temperature control device for controlling the temperature inside a container by controlling on / off of a heating device, a temperature sensor for detecting the temperature inside the container, and an overshoot temperature setting part for setting an overshoot temperature at the time of startup heating. At the time of start-up heating, if the heating device is stopped when the temperature in the container reaches a certain set temperature, the set temperature predicted to reach the predetermined overshoot temperature in the container is set as the heating device off set temperature. A heating device off temperature setting unit that is set as, a heating device operation unit that stops the heating device when the temperature inside the container detected by the temperature sensor reaches the heating device off set temperature, and the temperature sensor detects Overshoot actual temperature in the container and overshoot set temperature of the overshoot temperature setting section And the temperature deviation is added to the heating device off set temperature set in the heating device off temperature setting part, and a heating device off set temperature correction part for resetting to a new heating device off set temperature is provided. A temperature control device provided. 2. A temperature control device for controlling the temperature inside a container by controlling on / off of a cooling device, wherein a temperature sensor for detecting the temperature inside the container and an undershoot temperature setting unit for setting an undershoot temperature during start-up cooling. During startup cooling, if the cooling device is stopped when the temperature inside the container reaches a certain set temperature, it is predicted that the temperature inside the container will reach a predetermined undershoot temperature. A cooling device off temperature setting unit, a cooling device operation unit that stops the cooling device when the temperature inside the container detected by the temperature sensor reaches the cooling device off set temperature, and the temperature sensor detects Undershoot actual temperature in the container and undershoot set temperature of the undershoot temperature setting section And the temperature deviation is added to the cooling device off set temperature set in the cooling device off temperature setting part, and a cooling device off set temperature correction part for resetting to a new cooling device off set temperature is provided. A temperature control device provided.