JP2000337684A - Control system of temperature controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the degree of freedom of temperature control by freely combining temperature sensor input with heater control output in a temperature controller with a plurality of temperature sensor inputs and a plurality of heater control outputs. SOLUTION: A plurality of temperature sensors 1-3 are provided in a room to be air-conditioned, and the energization of heaters 4 and 5 is controlled by a temperature controller 6 based on the temperature information of the sensors and the detection signal of heater output sensors 12 and 13. The temperature controller 6 is connected to a higher level controller 10 by an exclusive cable 9, and is configured so that the combination of temperature sensor input and heater control output can be arbitrarily changed according to a command from the upper-level controller 10, a preset operation pattern, or an external input signal 11, thus switching to a state for controlling the heater 4 according to the temperature information of the temperature sensor 1 by switching the temperature sensor input from the state for controlling the heater 4 according to the temperature information of, for example, a temperature sensor 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system in which a combination of a plurality of temperature sensor inputs and a plurality of heater control outputs in a temperature controller is switched by a microcomputer while performing temperature control. This technology can be used to optimize heater output, reduce power consumption, and develop a redundant temperature control system.

[0002]

2. Description of the Related Art In a temperature controller having one or a plurality of temperature sensor inputs and a heater control output, when it is desired to measure temperatures at a plurality of measurement points and control one heater, it is necessary to switch the input of the temperature sensor. is there. Also,
Similarly, when controlling a plurality of heaters simultaneously or individually by one temperature sensor input, it is necessary to switch the heater control output. As described above, when the temperature sensor input and the heater control output do not correspond one-to-one, it is necessary to switch between the temperature sensor input and the heater control output by an external circuit or the like of the temperature controller.

[0003]

In a temperature controller having a plurality of temperature sensor inputs and a heater control output, when switching between the temperature sensor input and the heater control output, an external circuit or the like is required in addition to the temperature controller. There are problems that the circuit configuration is complicated and that the reliability is reduced due to an increase in the number of parts. In addition, circuit errors of the external circuit and influences of noise and the like in connection with the external circuit may cause a malfunction and an error of a temperature sensor input or a heater control output.

When switching between the input of the temperature sensor and the output of the heater control is performed by an external circuit or the like, synchronous control with the temperature controller is indispensable, and more complicated control and control are required to enable free combination. There are also problems such as the need for connection.

[0005]

SUMMARY OF THE INVENTION In a temperature controller having a plurality of temperature sensor inputs and a heater control output, a microcomputer judges a combination of the temperature sensor input and the heater control output and switches freely by the temperature controller itself. This enables temperature control that does not require an external circuit or the like.

The combination of the input of the temperature sensor and the output of the heater control is determined by a command from a host controller via an external interface of the temperature controller, an external input signal, or an operation pattern set in the temperature controller, a heater output sensor. The microcomputer makes a judgment based on such information.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below.

FIG. 1 is a schematic diagram of a temperature controller having a plurality of temperature sensor inputs and a plurality of heater control outputs according to an embodiment of the present invention. The temperature sensor 1, the temperature sensor 2, and the temperature sensor 3 output temperature information as a resistance value, and the heater 4,
The heater 5 performs heating by energization. The temperature controller 6 controls the heater 4 or the heater 5 based on the temperature information from the temperature sensor 1, the temperature sensor 2, or the temperature sensor 3 to control the temperature of the control target.

The temperature controller 6 is connected to a host controller 10 via a dedicated cable 9, and can perform temperature control by communicating with the host controller 10. Further, the temperature controller can measure the actual heater control output by the heater output sensor 12 and the heater output sensor 13. The combination of the temperature sensor input and the heater control output is determined and switched by the microcomputer 7. Various data such as an operation pattern and a capacity control determination value are stored in the memory 8 capable of storing data.

FIG. 1 shows a configuration in which the temperature sensor input is set to three points (temperature sensor 1, temperature sensor 2, temperature sensor 3) and the heater control output is set to two points (heater 4, heater 5). Heater 4 according to the temperature information of
To control the heater 5 based on the temperature information of the temperature sensor 3 (in the case of one-to-one input / output), thereby enabling the temperature control. At the same time, a command from the host controller 10, an operation pattern set in advance, or an external input signal 1
1 allows the combination of the temperature sensor input and the heater control output to be changed. For example, by switching the input of the temperature sensor from the state where the heater 4 is controlled by the temperature information of the temperature sensor 2, the heater 4 can be controlled by the temperature information of the temperature sensor 1.

The above configuration is effective when it is desired to change the measurement point to be controlled during temperature control.

FIG. 2 is a schematic diagram when the temperature sensor input is two points (temperature sensor 2 and temperature sensor 3) and the heater control output is one point (heater 4). As a method of controlling one heater control output using a plurality of temperature sensors, there are a method of controlling a heater control output by sequentially switching a plurality of temperature sensor inputs, and a method of controlling a heater control by an average value of a plurality of temperature sensor inputs. There is a way to control the output.

The above configuration is effective when it is desired to install a plurality of measurement points based on the shape of the control target, or when it is desired to install a plurality of measurement points for the purpose of making the temperature distribution uniform.

FIG. 3 is a schematic diagram when the temperature sensor input is one point (temperature sensor 1) and the heater control output is two points (heater 4 and heater 5). As a method of controlling two heater control outputs using one temperature sensor, a method of controlling two heater control outputs simultaneously or sequentially by a temperature sensor input and a method of using two heater control outputs having different capacities are used. There is a method of judging which heater control output to use by judging from a temperature difference from a control target or a response.

The method of determining the capacity of the heater control output includes a method of setting a capacity determination value in the microcomputer 7 of the temperature controller or the memory 8 capable of storing data, and a method of controlling the actual heater control output by the temperature control. There is a method in which the heater measures with the heater output sensor 12 and the heater output sensor 13.

The above configuration is used when it is desired to control the heater control output capacity to make it possible to make the heater control output optimal for the load, or when it is desired to reduce the power consumption by using heater control outputs having different capacities. It is effective for

FIG. 4 is a schematic diagram when the temperature sensor input is two points (temperature sensor 2 and temperature sensor 3) and the heater control output is two points (heater 4 and heater 5).

When the temperature sensor input and the heater control output are doubled, a method in which the temperature controller detects an abnormality in the temperature sensor input or the heater control output and automatically switches to the normal temperature sensor input or the heater control output. And a method of sequentially switching the temperature sensor input and the heater control output in consideration of the service life and the like.

The above configuration is effective when it is desired to construct a redundant temperature control system.

The combination of the above contents and the switching method are based on a command from the host controller 10, an external input signal 1
The selection is made possible by 1, and the selection can also be made based on the operation pattern set in the memory 8 capable of storing data and the measured value of the heater output sensor 12 or the heater output sensor 13.

Further, as shown in FIG. 5, the present temperature controller allows the above contents to be controlled not only for one controlled object but also for a plurality of controlled objects individually.

FIG. 6 is a schematic diagram of a circuit configuration in the temperature controller.

A temperature sensor input section of the temperature controller 6 converts inputs from a plurality of temperature sensors (such as the temperature sensor 1) into a voltage by a sensor input circuit 14, and converts the converted voltage to an optimum voltage by an amplifier circuit 15. After being amplified to a value, the A / D conversion circuit 16 converts the voltage value (analog voltage) to a digital amount. Then, the microcomputer 7 converts the temperature information converted into a digital amount by the A / D conversion circuit 16 and the information of the memory 8 capable of storing data into temperature data by the microcomputer 7. Further, the sensor input circuit 14 can freely switch inputs from a plurality of temperature sensors in accordance with a command from the microcomputer 7.

The heater control output section controls the energization of the heater (heater 4 etc.) by the heater control circuit 17 based on the heater control output value calculated by the microcomputer 7. Further, the heater control circuit 17 can freely switch the outputs of the plurality of heater controls according to a command from the microcomputer 7.

The temperature controller 6 is connected to the host controller 10, the external input signal 11, and the heater output sensor 12 by an external I / F circuit 18, and the data collected by the external I / F circuit 18 is connected to a microcomputer. By making the determination in step 7, the combination of a plurality of temperature sensor inputs and a plurality of heater control outputs, a switching method, and the like are determined.

FIG. 7 is a flowchart showing an outline of the temperature control.

The temperature controller determines the switching method between the temperature sensor input and the heater control output by judging from the command from the host controller 10, the external input signal 11, the operation pattern and the like (FIG. 7- (1)). Measure the input data of the temperature sensor by the selected method of switching the temperature sensor input,
The temperature difference from the control target value is calculated (FIG. 7- (2)). Next, a necessary heater output value is calculated using the calculated temperature difference (FIG. 7- (3)). Finally, the heater output is controlled by the selected heater control output switching method (FIG. 7- (4)), and the temperature of the control object is controlled. The above contents are performed for all objects of the temperature controller (the number of objects requiring temperature control).

FIG. 8 is a flowchart of the temperature sensor input switching control (contents of FIG. 7- (2)).

The temperature controller switches the selected temperature sensor input by: (1) a method of sequentially switching a plurality of temperature sensor inputs; (2) a method of using an average of a plurality of temperature sensor inputs; The method is selected from a method using as a heavy system and (4) a method using individual temperature sensor inputs.

(1) When a method of sequentially switching is selected, a plurality of designated temperature sensor inputs are sequentially switched to calculate a temperature difference from a control target value. (2) When the averaging method is selected, an average value is calculated from input data of a plurality of designated temperature sensors, and a temperature difference between the average value and the control target value is calculated. (3) When the dual system is selected, the state of the corresponding temperature sensor input is determined, and the control target value is determined by using the corresponding temperature sensor if normal and using the temperature sensor designated as a spare if abnormal. Is calculated. (4) When individual is selected, the temperature difference between the input data of the corresponding temperature sensor and the control target value is calculated.

Here, the corresponding temperature sensor input indicates one temperature sensor input specified for the control object, but it is not limited to a fixed temperature sensor input, and may be changed during temperature control. And Further, the dual method can be applied even when the sequential, average, and individual methods are selected, when there is a temperature sensor input that can be designated as a spare.

FIG. 9 is a flowchart of the heater control output switching control (contents of FIG. 7- (4)).

The method of switching the selected heater control output is as follows: (1) a method of sequentially switching a plurality of heater control outputs, (2) a method of simultaneously using a plurality of heater control outputs, and (3) a heater control. The method is selected from a method of switching the heater control output according to the capacity of the output, (4) a method of using a dual system, and (5) a method of individually using the heater control output.

(1) When the sequential switching method is selected, a plurality of designated heater control outputs are sequentially switched to perform a heater control output corresponding to a heater output value calculated from a temperature difference. (2) When the method of using the heaters at the same time is selected, the heater control outputs are performed by simultaneously using a plurality of designated heater control outputs. (3) When the method of switching according to the capacity of the heater control output is selected,
The heater output value calculated from the temperature difference is compared with the capacity of the heater control output, and the heater control output that satisfies the required capacity is determined and performed.

(4) When the dual system is selected, the state of the corresponding heater control output is determined. If the state is normal, the corresponding heater control output is used. If the state is abnormal, the heater control output designated as a spare is used. Then, a heater control output corresponding to the heater output value is performed. (5) When individual is selected, a heater control output corresponding to the heater output value is performed using the corresponding heater control output.

Here, the corresponding heater control output is
Although one heater control output specified for the control target is shown, it is not limited to a fixed heater control output, and it is also possible to change the output during temperature control. Also, 2
The heavy-duty method can be applied to the case where there is a heater control output that can be designated as a spare even when the sequential, simultaneous, capacity, and individual methods are selected.

[0037]

According to the present invention, in a temperature controller having a plurality of temperature sensor inputs and a plurality of heater control outputs,
The temperature sensor input and the heater control output can be freely combined without using an external circuit or the like, and the temperature can be switched even during the temperature control.

In the present temperature controller, the combination of the temperature sensor input and the heater control output and the switching method can be freely set. Therefore, when it is desired to change the measurement point to be controlled during the temperature control, to install a plurality of measurement points, This is effective for controlling the capacity of the control output or for constructing a redundant temperature control system.

Further, since a complicated circuit configuration is not required and the system is hardly affected by disturbance, and switching can be performed within the temperature controller, it is possible to respond instantaneously to a control target. Can be constructed.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a temperature controller having a plurality of temperature sensor inputs and a plurality of heater control outputs of the present invention.

FIG. 2 shows two temperature sensor inputs and one heater control output.
It is the schematic in the case of setting it as a point.

FIG. 3 shows one input of a temperature sensor and two outputs of a heater control.
It is the schematic in the case of setting it as a point.

FIG. 4 shows two temperature sensor inputs and two heater control outputs.
It is the schematic in the case of setting it as a point.

FIG. 5 is a schematic diagram of a case where a plurality of control targets are individually controlled.

FIG. 6 is a schematic diagram of a circuit configuration in a temperature controller.

FIG. 7 is a temperature control flowchart of the temperature controller.

FIG. 8 is a flowchart of a temperature sensor input switching control.

FIG. 9 is a flowchart of a heater control output switching control.

[Explanation of symbols]

1: temperature sensor, 2: temperature sensor, 3: temperature sensor, 4
... heater, 5 ... heater, 6 ... temperature controller, 7 ... microcomputer, 8 ... memory capable of storing data, 9 ...
Dedicated cable, 10: Host controller, 11: External input signal, 12: Heater output sensor, 13: Heater output sensor, 14: Sensor input circuit, 15: Amplifier circuit, 1
6 ... A / D conversion circuit, 17 ... Heater control circuit, 18 ...
External I / F circuit.

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Shintaro Masuda 390 Muramatsu, Shimizu-shi, Shizuoka Prefecture Within Hitachi Shimizu Engineering Co., Ltd. (72) Takao Ouchi 390 Muramatsu, Shimizu-shi, Shizuoka Prefecture Hitachi Shimizu Engineering Co., Ltd. In-house F term (reference) 3L060 AA03 AA06 CC01 DD02 DD05 EE23 3L061 BA01 BA07

Claims (1)

[Claims] In a temperature controller having a plurality of temperature sensor inputs and a plurality of heater control outputs, a temperature sensor input and a heater control output can be freely combined, and switching is possible even during temperature control. Control method for a temperature controller, characterized by simple control.