JPH0464109A - Humidity controller with on/off control - Google Patents

Abstract

PURPOSE:To stably control humidity with accuracy corresponding to the condition and environment of a control object by calculating a histeresis value based on the fluctuation of detected humidity, comparing the detected humidity with a value adding/subtracting the 1/2 of this histeresis value to the set humidity, and generating an ON/OFF control signal. CONSTITUTION:A humidity detection part 1 is provided to detect humidity in the control object, a humidity set part 2 is provided to set humidity as the target of control, and a histeresis value calculation part 4 is provided to calculate the histeresis value corresponding to the type, condition and environment of the control object based on the fluctuation of detected humidity. Then, the signal of ON/OFF control is generated by comparing the humidity detected by the humidity detection part 1 with the value adding/subtracting the 1/2 of the histeresis value calculated by the histeresis value calculation part 4 to the humidity set by the humidity set part 2. Thus, even when the type of the control object is changed or when the condition or environment of the control object is changed, the histeresis value is automatically made proper corresponding to the change, a control operation is not made instable, and high control accuracy can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a humidity control device using on/off control.

(Prior Art) Conventionally, in this type of device, when generating an on/off control signal by comparing a set humidity, which is a control target, with the detected humidity detected in a controlled object (for example, a room), the target value is compared. A dead zone of a certain width was provided in the center to prevent control instability.

FIG. 3 shows an example of this, in which a dead zone (hereinafter referred to as "hysteresis" because it is a hysteresis curve) of 5% relative humidity (RH) is provided around the target value.

According to this conventional example, the humidity of the control target increases for some reason and exceeds the target value indicating the humidity that is the control target.
%, a control-on signal is generated to start the humidity removal operation in the controlled object, and when the humidity in the controlled object gradually decreases and reaches 50%, a control-off signal is generated to start the humidity removal operation. Operation is stopped.

By repeating such operations, the humidity of the controlled object is controlled close to the target value.

In this conventional example, a hysteresis width (hereinafter referred to as hysteresis value) of 5% is provided to prevent instability of control, that is, hunting, etc.

By the way, in general, when the hysteresis value is decreased, the controlled amount approaches the target value, but small changes in the detected value tend to turn on and off again, making the control operation unstable. An appropriate hysteresis value is set depending on the controlled object.

[Problem to be solved by the invention]

However, with a fixed hysteresis value as described above, the control target changes, the situation of the control target (indoor humidity generation state, etc.), the environment (outdoor humidity from which moisture is discharged, etc.)
When this happens, the control may become unstable or the control accuracy may become insufficient for the situation of the controlled object.

The present invention was made to eliminate such delays, and even if the controlled object changes, the situation of the controlled object, or the environment changes, control is performed with corresponding accuracy and control is stable. The object of the present invention is to provide a humidity control device that performs on-off control.

Means for Solving Problem C] To achieve the above object, the present invention determines a hysteresis value based on fluctuations in the humidity of a controlled object. ),
It is configured as shown in (2).

(1) A humidity detecting means for detecting the humidity of the controlled object, a humidity setting means for setting the humidity as a control target, and a hysteresis value of 172, which is required for the humidity set by the humidity setting means.
a comparison means for generating an on/off control signal by comparing the value obtained by adding or subtracting the value with the humidity detected by the humidity detection means, and a hysteresis for calculating the hysteresis value based on the fluctuation of the humidity detected by the humidity detection means. A humidity control device with on/off control, which is equipped with a value calculation means.

(2) In (1) above, the hysteresis value calculating means samples the detected value of the humidity detecting means, calculates a regression line using the least squares method based on this, and compares the value of this straight line with the value obtained by the sampling. A humidity control device using on/off control that calculates a hysteresis value by calculating the maximum value of the difference between the two and further multiplying this maximum value by a prescribed coefficient.

(Function) According to the configurations (1)' and (2) above, the hysteresis value is calculated based on the fluctuation of the detected humidity, and the value obtained by adding/subtracting 1/2 of this hysteresis value to the set humidity and the detected humidity are calculated. are compared, and an on/off control signal is generated.

(Example〕 The present invention will be explained in detail below with reference to Examples.

FIG. 1 is a block diagram of a "humidity control device using on/off control" which is an embodiment of the present invention, and FIG. 2 is an explanatory diagram of hysteresis value calculation in the same embodiment.

In FIG. 1, 1 is a humidity detection unit that detects the humidity in the object, 2 is a humidity setting unit that sets the humidity as a control target, and 4 is a humidity setting unit that sets the humidity as a control target, and 4 determines the type of control object, the situation, This is a hysteresis value calculation unit that calculates a hysteresis value suitable for the environment.

3 compares the value obtained by adding/subtracting 1/2 of the hysteresis value calculated by the hysteresis value calculation unit 4 to the humidity set by the humidity setting unit 2 and the humidity detected by the humidity detection unit 1, and determines the on/off control. This is a comparison unit that generates a signal. 5 is comparison section 3
The load dehumidifier is driven based on the on/off signal generated by the dehumidifier.

This is the load control section that stops.

Next, the method of calculating the hysteresis value will be explained.

First, 100 samples of the humidity detected by the humidity detection unit are sampled at 1 second intervals, and a regression line is calculated using the least squares method from all the samples as shown in FIG.

Is it a linear regression equation? △ h, = α, ten β Then, The humidity fluctuation range Δ is Δ=Max(1h.

=MaX(1h1-α1-β1).

The hysteresis value required for calculation involving N samples is obtained by multiplying this fluctuation range Δ by a predetermined coefficient. Assuming that the target value is near the regression line, and in order to determine the hysteresis value so as not to respond to short-term humidity changes such as sample values, if we allow a 20% margin in the fluctuation range Δ, the coefficient is 2. .4.

Such calculation of the hysteresis value is performed every 6 hours to update the hysteresis value for comparison.

In addition, the regression is determined and the hysteresis value is calculated by:
This is because the humidity does not necessarily change overall during sunblinking, and may be rising or falling as shown in FIG. 2, for example. Therefore, first, regression is calculated to find out the overall change during sampling, and then the true fluctuation range is calculated by subtracting the influence, and the hysteresis value is calculated based on this.

When the control target was placed inside a general residential house and outdoors using this embodiment, the hysteresis value was 2 to 4% in the former and 5 to 10% in the latter, and the operation was unstable with the conventional fixed hysteresis value. Stable control was possible even outdoors, where humidity fluctuates widely.

Note that as a load, a ventilation fan, a dehumidifier, a humidifier, etc. can be used alone or in an appropriate combination.

(Effects of the Invention) As explained above, according to the present invention, even if the type of the controlled object changes, or the situation or environment of the controlled object changes,
Since the hysteresis value automatically becomes an appropriate value accordingly, the control operation does not become unstable and high control accuracy can be obtained.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is an explanatory diagram of hysteresis value calculation in the same embodiment, and FIG. 3 is an explanatory diagram of hysteresis in a conventional example. 1--Humidity detection section 2--Humidity setting section 3--Comparison section 4--Hysteresis value calculation section Exciting example [Regeneration flash @Figure 1 Applicant Sekisui Chemical Co., Ltd. company burial mounds array steresis skin) gF3/EI7 2nd
figure

Claims (2)

[Claims] (1) Humidity detection means for detecting the humidity of the controlled object, humidity setting means for setting the humidity to be the control target, and 1/2 of the hysteresis value required for the humidity set by the humidity setting means.
a comparison means for generating an on/off control signal by comparing the value obtained by adding or subtracting the value with the humidity detected by the humidity detection means, and a hysteresis for calculating the hysteresis value based on the fluctuation of the humidity detected by the humidity detection means. 1. A humidity control device with on/off control, comprising: a value calculation means. (2) The hysteresis value calculating means samples the detected value of the humidity detecting means, calculates a regression line using the least squares method based on this, and calculates the maximum value of the difference between the value of this straight line and the value obtained by the sampling. 2. The humidity control device using on/off control according to claim 1, wherein the hysteresis value is calculated by calculating the maximum value and further multiplying the maximum value by a predetermined coefficient.