JPH0330004A - Thermo-hygrostat - Google Patents

Abstract

PURPOSE:To control the dew condensation prevention in a short time by bringing temperature and humidity of fuzzy control. CONSTITUTION:In case a temperature difference td between an atmospheric temperature ap and a sample temperature tsp is large, and the temperature variation quantity md is also large, and also, a temperature variation (tc) of tap in a device is controlled to a high temperature side, as for each membership value from the respective membership functions, a smaller one is selected. As a result, a member ship function related to each of each operation control signal sh, sr and sm of a fuzzy rule is cut and superposed, and the membership function is obtained, and for instance, by deriving the center of gravity, signal data of an operation control of a heating heater KH, a refrigerator RK and a temperature controller OC which are settled is obtained. In such a way, by bringing temperature and humidity in the device to fuzzy control, the control for the dew condensation prevention can be executed in a short time and easily.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention operates a control means corresponding to the temperature and humidity inside the device based on the detection output from the inside temperature and humidity detection means. The present invention relates to a constant temperature and humidity device that is configured to be able to control the temperature and humidity to a set value.

(Prior art) A constant temperature and humidity device is used to control the temperature and humidity inside the device for the purpose of testing the test specimens set inside the device in various environmental conditions such as a high temperature hut condition or a low temperature and low humidity condition. and can be kept constant at the set value.

By the way, in environmental tests of specimens inside equipment, changes in temperature or humidity can cause dew condensation on the specimen, so in order to prevent this, for example, changing from room temperature and humidity conditions to high temperature hut conditions is necessary. When controlling, the temperature is first changed from normal temperature to high temperature, and then the humidity is controlled to increase from normal humidity to high humidity. Conversely, when controlling from a high temperature and high humidity state to a low temperature and low humidity state, the humidity is It is necessary to control the humidity by lowering the temperature first and then lowering the temperature from high humidity to low humidity.

(Problems to be Solved by the Invention) However, such temperature and humidity control requires laborious and time-consuming control in units of several degrees of temperature in order to prevent dew condensation on the sample.

An object of the present invention is to enable smooth control of internal temperature and humidity in a short time and easily using fuzzy control.

(Means for Achieving the Problem) In order to achieve such an object, the constant temperature and humidity device of the present invention includes means for controlling heating, cooling and humidity, and a detection means for detecting and outputting internal temperature and humidity. and configured to be able to control the temperature and humidity within the apparatus to set values by operating each of the control means based on the detection output from the detection means, the detection means The temperature difference between the current ambient temperature in the device and the current temperature of the sample in the device, the amount of change in the current humidity to the set humidity in the device, and the set value of the ambient temperature in the device. A data output means that calculates and outputs a temperature change direction indicating whether the current ambient temperature is high or low, and a combination of the temperature difference, humidity change amount, and temperature change direction. , stores a plurality of fuzzy rules in which the operation amount of each of the control means is used as a consequent for the antecedent part, and uses each data from the data output means to execute each control means according to the fuzzy rule. The present invention is characterized by comprising a fuzzy controller that performs fuzzy inference on the operation of the controller and outputs an operation control signal to each control means in response to the inference.

(Function) The detection means in the above configuration detects the temperature and humidity inside the constant temperature and humidity device. The detection output from this detection means is then given to the data output means. In response to this detection output, the data output means informs the fuzzy controller of the temperature difference between the current ambient temperature in the device and the sample temperature, the amount of change in the current humidity to the set humidity,
It calculates and outputs various data regarding whether the set ambient temperature is higher or lower than the current ambient temperature and the direction of temperature change.

The fuzzy controller performs fuzzy inference on the operation of each control means according to fuzzy rules using each data given from the data output means, and outputs an operation control signal to each control means in accordance with the inference.

Therefore, each control means operates in response to the operation control signal to control the temperature and humidity within the apparatus so that no dew condensation occurs on the sample.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a circuit block diagram of a constant temperature and humidity apparatus according to an embodiment of the present invention.

In FIG. 1, KB is a keyboard for inputting the temperature and humidity set values inside the constant temperature and humidity device of this embodiment, HK is a display for the internal temperature and humidity, and OS is an internal temperature and humidity display inside the device. SS is a temperature sensor that detects and outputs the current ambient temperature (tap) and the temperature of the sample set in the device (tsp), and SS is a humidity sensor that detects and outputs the current humidity (alp) in the device. is a heater that heats the inside of the device in response to the input of the operation control signal (sh), RK is the refrigerator that cools the inside of the device in response to the input of the operation control signal (sr), and OC is the operation control signal (sm ) is a humidity controller that controls the humidity within the device in response to input.

In the constant temperature and humidity device of this embodiment having such a basic configuration, the TCM detects the current atmospheric temperature (
tap) and the current temperature (tsp) of the sample in the device (td), the humidity change It (m d ) of the current humidity (+sp) to the set humidity (1S) in the device, and a central control unit as a data output means for calculating and outputting a temperature change direction (tc) indicating whether the set ambient temperature (tas) is on the high temperature side or the low temperature side with respect to the current ambient temperature (tap) in the device; The PC calculates the combination of the temperature difference (td), humidity change fft (fIld), and temperature change direction (tc) as an antecedent part (i[), and for that antecedent part, a heating heater K1- which is a control means. 1. The central control means TCM stores a plurality of fuzzy rules shown in the table below, in which the combination of the operation amount and operation procedure of each of the refrigerator RK and the humidity controller OC is stored as a consequent part (then), and the central control means TCM Each data from ( t d , t d
, t c ), the operations of the heater K H , the refrigerator RK, and the humidity controller OC are fuzzy inferred according to the fuzzy rules, and the operation control signals (Sh , s r, s ra
) is a fuzzy skit that outputs the following. (Hereinafter, blank space) <Fuzzy rules> In the above fungi rule table, heater K 1-
If there is heating according to No. 1 and humidity control using the humidity controller OC, the fuzzy controller FC controls the humidity so that the rule is to perform the humidity control after the heating. Also,
PS, PM, ... are antecedent variables t d and a, respectively.
d, tc and consequent variables shsr, smh {fuzzy label name of the fuzzy set to which it belongs.

The fuzzy controller FC uses the antecedent variable t d . The membership functions in the membership function coordinate system of m d and tC, and the respective membership functions of the consequent variables s h , s r , and s m as shown in Fig. 3 (a), (b), and (c), respectively. Membership functions in the coordinate system are respectively stored.

The operation will be explained using an example.

First, the temperature difference (td) between the current ambient temperature (tap) in the device and the temperature of the sample (tsp) is large, for example, 53°C, and the humidity change ffi (ta d) is large, 90%. In the case where the direction of temperature change (tc) of the ambient temperature inside is controlled to the high temperature side, Fig. 2 (a) (b) (c)
From each membership function, t d = ZR, P
Each membership value of S is zero, that of t d = PM is 0.25, that of td = PL is 0.75, md = NL
- that of PM is zero, md = that of PL is I1t c
= PL becomes l. Each of these membership values is applied to each of the above-mentioned fuzzy rules (1) to (2), and for each fuzzy rule, the one with the smaller membership value of each antecedent part is selected (MIN calculation). According to this, the minimum membership value in the fuzzy rule of ■ is 0.75,
The minimum membership value for other fuzzy rules will be zero. Then, based on this selected membership value, the s of each fuzzy rule is determined from FIG.
h. N L for each of s r and s m
, . . . each membership function of PS, PM, and PL is cut off by a broken line as shown.

All these shredded fun rules s h
, s r , s ts are superimposed (MAX operation) to obtain the final s
The superposition membership functions of h, s r , and s m are obtained. By determining, for example, the center of gravity of this superposition membership function, determined signal data for controlling the operation of the heater KH, refrigerator RK, and humidity control IJA machine OC can be obtained.

In other words, in the above example, the heater KH heats the inside of the device to a medium level, the cooling operation of the refrigerator RK is stopped, and after the heating by the heater KH, the humidity controller OC slowly returns the humidity to the set value. Operation controlled to control.

(Effects of the Invention) As is clear from the above explanation, according to the present invention, since the temperature and humidity inside the device are controlled by fuzzy control, Control to prevent condensation can be performed easily and in a short time.

[Brief explanation of drawings]

The figures relate to an embodiment of the present invention, FIG. 1 is a circuit block diagram showing the configuration of a constant temperature and humidity device according to an embodiment of the present invention, and FIGS. 2(a), (b), and (c) are respectively similar to FIG. Figure 3 (a), (b), and (c) are diagrams showing the membership functions for the antecedent variables stored in the fuzzy controller of Figure 1, respectively. It is a figure showing the membership function in. KB...keyboard, OS...temperature sensor, SS...
...Humidity sensor, KH...heater, RK...refrigerator, OC...humidity controller, TCM...central control section (data output means) FC...fuzzy controller.

Claims (1)

[Claims] (1) By providing a means for controlling heating, cooling and humidity, and a detecting means for detecting and outputting the temperature and humidity within the device, and operating each of the control means based on the detection output from the detecting means. In a constant temperature and humidity device configured to be able to control the temperature and humidity inside the device to set values, the current ambient temperature in the device from the detection means and the current temperature of the sample in the device , the amount of change in the current humidity relative to the set humidity in the device, and the temperature change direction indicating whether the set value of the ambient temperature is on the higher or lower side with respect to the current ambient temperature in the device. A fuzzy rule in which the antecedent part is a combination of the data output means that calculates and outputs the temperature difference, the humidity change amount, and the temperature change direction, and the consequent part is the operation amount of each of the control means for the antecedent part. , performs fuzzy inference on the operation of each control means according to the fuzzy rule using each data from the data output means, and sends an operation control signal to each control means in accordance with the inference. A constant temperature and humidity device characterized by being equipped with a fuzzy controller that outputs output, and the following.