JPH09101801A - Controller - Google Patents

Abstract

(57) An object of the present invention is to correct an input value into an indicated value and to make a finer correction of the input value in a controller that performs control based on the indicated value. SOLUTION: At least two preset setting values and a correction value for each preset value are stored in a memory 9 as a correcting parameter, and an arithmetic unit 12 uses an input unit 7 based on the correcting parameter. A so-called two-point correction is performed from the input value given by the linear approximation to calculate the indicated value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a controller such as a temperature controller, and more particularly to a controller that corrects an input value to obtain an instruction value and controls based on the instruction value.

[0002]

2. Description of the Related Art In a controller of this type, for example, a temperature controller, when it is physically difficult to arrange a temperature sensor sufficiently close to an object to be measured, the temperature sensor measures the temperature. The temperature input that is input to the temperature controller will be lower than the actual temperature of the measurement target.
For example, while the actual temperature of the measurement target is 196 ° C, the temperature measured by the temperature sensor is 175 ° C.
That is the case.

In order to deal with such a case, some temperature controllers have an input correction function, and the difference between the temperature measured by the temperature sensor and the actual temperature of the object to be measured, the above-mentioned example. Then, 21 (= 196-175) is set in advance in the temperature controller as a correction value, so that the correction value is added to the input temperature from the temperature sensor and displayed as the instruction temperature, and Is controlled to reach the target temperature.

[0004]

However, in the conventional input correction, the preset correction value is simply added (or subtracted) to the input temperature from the temperature sensor as described above. Since it was so-called one-point correction, for example, temperature control was not started and the room temperature was 25 °.
Even in the case of C, in the above example, the correction value 21 is added and 46 ° C. is displayed as the instruction temperature at room temperature.

As described above, even though the temperature is at room temperature, the temperature far from the room temperature is displayed as the instruction temperature, so that the user misunderstands that the temperature sensor or the like may be defective. There is fear.

Therefore, while the same correction as in the conventional example is made at a relatively high temperature near the set temperature at which the temperature control is actually carried out, a correction value different from the high temperature is desired even at a relatively low temperature near room temperature. For example, it is desirable that the room temperature be kept as it is at the instructed temperature in the vicinity of room temperature.

The present invention has been made in view of the above points, and an object of the present invention is to provide a controller capable of finely correcting an input value as compared with a conventional example.

[0008]

In order to achieve the above-mentioned object, the present invention is configured as follows.

That is, according to the present invention, in a controller that corrects an input value into an indication value and controls based on the indication value, at least two preset values and correction values for each preset value are preset. However, the storage unit stores a correction parameter, and a calculation unit that calculates the instruction value from the input value based on the correction parameter of the storage unit.

The calculator may calculate the indicated value by linear approximation.

The two set values may be an upper limit value and a lower limit value of the input range.

Further, the controller of the present invention may be a temperature controller for controlling the temperature.

According to the controller of the present invention, at least two set values and correction values for each set value are used as the correction parameters, and the input values are corrected to the indicated values by linear approximation, for example, based on the correction parameters. Therefore, the input value is corrected by the correction value corresponding to the input value, and the correction value is the same regardless of the input value.
As compared with the conventional example of so-called one-point correction, fine and precise correction can be performed.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a front view of a temperature controller according to the present invention.

On the front surface of the temperature controller 1, there is an LED display section 2 consisting of a first display section 2a for displaying the present temperature and the like and a second display section 2b for displaying the set temperature and the like. Various LEDs 3 for displaying an operation are arranged on the above, and further various operation keys such as a mode key 4, a down key 5 or an up key 6 are arranged below the LED 3.

FIG. 2 is a block diagram showing the internal structure of the temperature controller 1 of FIG. 1, and the parts corresponding to those of FIG. 1 are designated by the same reference numerals.

In the figure, 7 is an input section to which the output of a temperature sensor (not shown) is given, and 8 is the various operation keys 4 described above.
Setting unit 2 including 6 to 2, the above-mentioned L for performing temperature display, etc.
An ED display unit, 9 is a memory in which a correction value and the like, which will be described later, set by the setting unit 8 is stored as a correction parameter, and 12 is a temperature input from the input unit 7, and correction calculation is performed using the correction parameter of the memory 9. A calculation unit for converting the temperature into an instruction temperature by 1
Reference numeral 1 denotes a control unit that gives a control output to the output unit 10 so that the instruction temperature from the calculation unit 12 reaches a set temperature and controls each unit.

The temperature controller 1 of this embodiment is constructed as follows so that the temperature input can be corrected more finely than the conventional example.

That is, in the temperature controller 1, it is possible to set a correction value for correcting the temperature input at the upper limit value and the lower limit value of the input range corresponding to the type of the temperature sensor, that is, so-called deviation setting can be performed. Thus, the upper limit value and the lower limit value of the input set in advance in this way and the respective correction values corresponding to them are stored in the memory 9 as correction parameters, and the calculation unit 12 calculates the temperature based on these correction parameters. The input temperature is calculated by correcting the input by linear approximation as described later.

That is, the temperature controller 1 of this embodiment performs so-called two-point correction.

FIG. 3 is a diagram showing the relationship between the temperature input and the indicated temperature for explaining the principle of the two-point correction of the temperature input. In FIG. 3, the solid line shows the correction straight line of the present invention,
The virtual line shows the correction straight line of the conventional one-point correction.

In FIG. 3, the input range is 0 ° C to 30 ° C.
An example of 0 ° C. is shown, and as described in the above-mentioned related art, for example, the actual temperature of the measurement target is 1
When the temperature is 96 ° C, the temperature measured by the temperature sensor,
That is, the temperature input to the temperature controller is 175 ° C.
In the case where the temperature is 175 ° C. and the designated temperature is 196 ° C., the input correction will be described when the designated temperature is 25 ° C. at the room temperature of 25 ° C.

In this case, the user wants to set the indicated temperature to 196 ° C. at the temperature input of 175 ° C. and to set the indicated temperature to 25 ° C. at the room temperature of 25 ° C. Therefore, the user can draw a straight line passing through these two points. From the above, a value of 338.5 ° C at the upper limit value of 300 ° C and a value of -3.5 ° C at the lower limit value are obtained.

Then, the correction value at the upper limit value of 300 ° C. is set to 38.5, and the correction value at the lower limit value of 0 ° C. is set to −3.5.

As a result, the upper limit value of 300 ° C., the lower limit value of 0 ° C., and the correction value of 38.5 corresponding to each of them,
-3.5 will be stored in the memory 9 as a correction parameter.

When an actual temperature input is made after the above correction parameters are stored, the indicated temperature corresponding to the temperature input is calculated and output by the linear approximation of FIG. 3 by the correction parameter.

Therefore, for example, if the temperature input is 175
When the temperature is ° C, the indicated temperature is 196 ° C, and when the room temperature is 25 ° C, the indicated temperature is 25 ° C. Next, the above-mentioned input correction setting operation will be described in more detail.

First, an input type selector switch (not shown) is operated to set an input range according to the type of the temperature sensor. In the above example, the input range is, for example, 0 ° C.
~ 300 ° C will be set.

Next, the mode key 4 shown in FIG.
Is set to the temperature input correction mode, and first, the correction value 3 at the input range upper limit value of 300 ° C is set.
Set 8.5 with the down key 5 or the up key 6, operate the mode key 4 again, and set the correction value -3.5 at the lower limit value 0 ° C of the input range with the down key 5 or the up key 6. Then, the mode key 4 is operated again to complete the setting of the input correction, whereby the upper limit value, the lower limit value of the input range and the corresponding correction values are stored in the memory 9 as the correction parameters. .

FIG. 4 is a flow chart for explaining the operation after the input correction is completed in advance as described above.

First, when there is a temperature input, the indicated temperature is calculated by linear approximation based on the correction parameter (step n1), the indicated temperature is displayed (step n2), and based on the indicated temperature and the target temperature, The operation amount for control is calculated and output (step n3), and the process returns to step n1.

According to this embodiment, since the correction is performed with the different correction value depending on the input temperature, the desired correction similar to the conventional example can be performed even at a relatively high temperature near the set temperature. For example, even at a relatively low temperature near room temperature, a desired correction is performed with a correction value different from the high temperature, and at room temperature, for example, the room temperature is displayed as the instruction temperature.

In the above embodiment, the setting of the input correction is
Since the correction value is set for each of the upper limit value and the lower limit value of the input range, the setting operation is simple, but as another embodiment of the present invention, any value other than the upper limit value and the lower limit value of the input range is set. May be set, and the correction value may be set to deviate from the set value.
Further, in the above-described embodiment, the correction values are set for the two values of the upper limit value and the lower limit value of the input range, and the correction is performed by linear approximation. However, as another embodiment of the present invention, three correction values are set. The above values may be set, and the correction values corresponding to the respective set values may be set individually to perform the correction by the polygonal line approximation.

[0035]

As described above, according to the present invention, at least two set values and a correction value for each set value are used as correction parameters, and two-point correction is performed by linear approximation, for example, based on the correction parameters. Since the input value is converted into the instruction value by the correction value, the input value is corrected by the correction value according to the input value, and the conventional one-point correction method in which the correction value is the same regardless of the input value Compared with the example, fine and precise correction can be performed.

[Brief description of the drawings]

FIG. 1 is a front view of a temperature controller according to the present invention.

FIG. 2 is a block diagram of the temperature controller of FIG. 1;

FIG. 3 is a diagram illustrating the principle of correction according to the present invention.

FIG. 4 is a flowchart for explaining the operation of the present invention.

[Explanation of symbols]

 1 Temperature Controller 8 Setting Unit 9 Memory 12 Computing Unit

Claims (4)

[Claims] 1. In a controller that corrects an input value to obtain an instruction value and performs control based on the instruction value, at least two preset setting values and a compensation value for each preset value are for correction. A controller comprising: a storage unit stored as a parameter; and a calculation unit that calculates the instruction value from the input value based on the correction parameter of the storage unit. 2. The controller according to claim 1, wherein the calculator calculates the indicated value by linear approximation. 3. The controller according to claim 1, wherein the two set values are an upper limit value and a lower limit value of an input range. 4. The controller according to claim 1, wherein the input value is a temperature input, the instruction value is an instruction temperature, and the temperature control is performed based on the instruction temperature. .