JPH0424456A - Air conditioner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an air conditioner used for air conditioning to adjust the air condition in specific environments such as general homes and office buildings.

BACKGROUND OF THE INVENTION In recent years, people have become more conscious of the comfort of the environment in their living spaces, and there has been a demand for control devices for air conditioners with better controllability.

Conventionally, in the control device of this type of air conditioner, when the user sets desired conditions (for example, to set the temperature to 22 degrees Celsius) as a set value to the control device, the control device calculates, for example, the equation (1). ), the actuator is operated by performing PI control calculations as shown in () to control the actuator to achieve the conditions desired by the user.

ΔU− Kp* (e, +(e, +e,,)/(2*Ti))・
...■ Here, e is the difference between the current measured value and the set value, enyo is the difference between the previous measured value and the set value, Kp is the proportional gain, and T
i is the integration time, and ΔU is the amount of change in the operation amount of the actuator.

Problems to be Solved by the Invention However, in the conventional PI control system, Kp and T
The value of i has been set in advance to a value that is thought to be optimal, but when the set value is changed, or when the specific control target changes (in air conditioning control, changes in the outside air condition and internal load are There was a problem in that controllability would worsen if the settings were not reset to (corresponding to changes in the characteristics of).

The present invention solves these problems, and provides an air conditioner that is easy to use and does not cause discomfort to the user without deteriorating controllability even when changing set values or changing the characteristics of the controlled object. The purpose is to provide the following.

Means for Solving the Problems In order to achieve the above object of the present invention, a first invention provides a method for determining the deviation between a desired set value of the air condition (for example, temperature, humidity, etc.) and the actual air condition; This air conditioner performs fuzzy control using the amount of change in this deviation every fixed period as input, and operates an actuator that adjusts the air condition. That is, the configuration includes an actuator that adjusts the air condition, an air condition measuring means that measures the air condition, an air condition setting means that sets a desired air condition, and a value measured by the air condition measuring means and the air condition setting means. The device is equipped with a deviation calculating means for calculating the deviation of the set value every fixed period, and a deviation change amount calculating means for calculating the amount of change in the deviation of the deviation calculated by the deviation calculating means for every fixed period, and the deviation, the deviation In addition to setting membership functions for the amount of change in the actuator operation amount and the amount of change in the actuator operation amount, a fuzzy rule is set to calculate the amount of change in the actuator operation amount from the deviation and the amount of change in the deviation. This air conditioner has fuzzy control means that determines the amount of change in and operates the actuator.

In addition to the fuzzy control of the first invention, the second invention adds means for standardizing each of the deviation, the amount of change in the deviation, and the amount of change in the actuator operation amount using a standardization constant, and is unique. Fuzzy control is performed using only the membership function of .

In other words, the configuration includes a normalization constant setting means, and a normalization for calculating each of the normalized deviation, the amount of change in the deviation, and the amount of change in the operation amount of the actuator using the normalization constant set by the normalization constant setting means. An air conditioner in which a means is added to the configuration of the first invention, and the membership function is composed of the only one common to each of the standardized deviation, the amount of change in the deviation, and the amount of change in the operation amount of the actuator. It is.

The third invention is that the output of the fuzzy control of the second invention is the normalized amount of change in the actuator operation amount, and this is processed with a normalization constant to calculate the actual amount of change in the actuator operation amount. It's something you get.

That is, in addition to the second aspect of the invention, as a configuration, operation amount change amount calculating means is provided for calculating the amount of change in the standardized actuator operation amount and the amount of change in the actuator operation amount set by the normalization constant setting means. It is an air conditioner.

Effect The first invention having the above configuration is characterized in that when the air condition is controlled to a desired state using an air conditioner, the deviation between the desired air condition and the current air condition, and the change in this deviation at regular intervals. In addition to setting a membership function for each of the amount and the amount of change in the operation amount of the actuator that can adjust the air condition, this membership function is used to calculate the deviation and the amount of change in the deviation,
A fuzzy rule is set for the amount of change in the operating amount of the actuator, and the actuator is operated using fuzzy control to achieve a desired air condition.

The second invention further normalizes the deviation, the amount of change in the deviation, and the amount of change in the operation amount of the actuator using a normalization constant, and uses a unified membership function to achieve the same result as the first invention. It performs fuzzy control. In this case, changes in input data values due to changes in the characteristics of the controlled object or changes in various means can be standardized by simply changing this normalization constant, improving versatility.

In the third invention, by using a standardized value as a fuzzy control output for the amount of change in the manipulated variable of the actuator, it is possible to calculate the actual amount of change in the manipulated variable using a normalization constant. Therefore, by simply changing this normalization constant, a fuzzy control means for controlling actuators having different characteristics can be realized.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an air conditioner according to an embodiment of the present invention. The air conditioner 1 uses a fan 2 to suck indoor air through a ventilation duct 3, heats or cools the air with a cold/hot water coil 4, and sends the air into the room through an air supply duct 5 to air-condition the room. Air condition detection means 6
measures the state of the air supplied indoors and inputs it to the control device 7. The actuator 8 can change the state of air supplied into the room, and is operated by the control device 7. To explain the configuration of the control device 7, the deviation calculation means 1
0, the deviation En is calculated at regular intervals from the output signal of the air condition detection means 6 and the air condition setting value set by the air condition setting means 9. The deviation change amount calculating means 11 calculates the change amount ΔEn of the deviation En for each fixed period. The normalization constant setting means 12 sets a deviation normalization constant Eno, a deviation change amount normalization constant ΔE no, and a manipulated variable change amount normalization constant ΔU.
o is set. Next, the deviation standardization means 13, which is one of the standardization means, calculates the deviation standard value en from the deviation standardization constant Eno. Furthermore, the deviation change amount normalization constant ΔEno is determined by the deviation change amount normalization means 14 which is another standardization means.
A deviation change amount standard value Δeft is calculated from. On the other hand, the fuzzy control means is configured as follows. First, the control rule storage means 15 stores the deviation standard value en, the deviation change amount standard value Δen, and the operation amount change amount standard value ΔU for the actuator 8.
It stores control rules (so-called fuzzy rules) that describe the relationship between Here, the control rule is written in a 1f-then format such as "If en is positive and large and Δen is zero, then ΔU should be positive and large." Here, the abstract expression "positive and large" or "zero" is expressed by a membership function and is defined in the membership function storage means 16 in the form shown in FIG. 2, for example. Shape and size are en.

Δen, ΔU are all common for normalized specification values (normalized between -1 and 1 in FIG. 2). The fuzzy inference means 17 refers to the control rule in the control rule storage means 15 and the membership function stored in the membership function storage means 16 from the deviation standard value en and the deviation change amount standard value Δen, and determines the operation amount for the actuator 8. A standard change value ΔU is calculated by fuzzy inference. The operation amount change calculation means 18 uses the operation amount change standard value ΔU calculated by the fuzzy inference means 17 and the normalization constant setting means 1.
The operation amount change amount ΔU is calculated using the operation amount change amount normalization constant ΔUo set in step 2, and a signal is sent to the actuator 8 to operate the actuator 8.

Next, the related operations of the constituent elements will be explained.

In order to make the explanation more concrete, here, the air condition detecting means 6 detects the temperature of the air supplied indoors, and the actuator 8 is a control device in which a valve that adjusts the amount of water in the cold/hot water coil 4 is used. The operation will be explained.

FIG. 3 is a flowchart showing the operation of the air conditioner control device of the present invention.

The deviation calculating means 10 calculates a deviation E n from the temperature T of the air supplied into the room from the air conditioner 1 measured in the air condition 6 and the temperature setting value T set in the air condition setting means 9.
(E n =T, -T(1) is calculated, and the deviation change amount calculating means 11 calculates the deviation change amount ΔEn (ΔEn=En−En
-1) (steps 301 to 304). The deviation standardization means 13 calculates the deviation standard value en from the deviation standardization constant Eno.
(en=En/Eno, however, when en>1, en=
1, when en<-1, en=-1) is calculated, and the deviation change standardization means 14 calculates the deviation change standard value Δen (Δen=ΔEn/ΔEno) from the deviation change standardization constant ΔEno.
, However, when Δen>1, Δen=1, Δen<-1
When Δen=-1) is calculated (step 305.
306).

The fuzzy inference means 17 uses the control rules (so-called fuzzy rules) of the control rule storage means 15 based on the values of en and Δen.
, fuzzy inference is performed using the membership function of the membership function setting means 16 using the so-called m a m d a n i method to calculate the standard value ΔU for the amount of change in the manipulated variable (step 307). The manipulated variable change calculation means 18 calculates the manipulated variable change amount ΔU (ΔU=Δυ*ΔUo) using the manipulated variable change standard value ΔU and the manipulated variable change standardization constant ΔUo, and sends a signal to the actuator 8 (cold/temperature). By operating the water coil valve), the amount of hot or cold water flowing into the cold/hot water coil is changed to change the temperature of the air supplied into the room (steps 308 and 309).
. Then, when the control period comes, step 301 is performed again.
Return to step 31 and repeat the same operation until the temperature of the air supplied into the room becomes equal to the temperature setting value (step 31).
0).

In this embodiment, an example was explained in which the temperature of the air supplied indoors is controlled using the valve of the hot and cold water coil. However, when controlling the indoor temperature using the valve of the hot and cold water coil, the indoor temperature can be controlled by Even if the output data value changes in various applications such as when controlling by changing the rotation speed of the constant ΔU
Standardization can be achieved by simply changing o), so this can be handled.

Effects of the Invention As is clear from the above explanation, the first invention provides an actuator for adjusting the air condition, a means for measuring the air condition, a means for setting the desired air condition, and a deviation between the measured value and the set value. By providing a calculating means for calculating the amount of change in the deviation and a calculating means for calculating the amount of change in the deviation, and calculating the amount of change in the operation amount of the actuator using fuzzy control from the deviation and the amount of change in the deviation, it is possible to prevent changes in the characteristics of the controlled object or the control characteristics. Since it is possible to converge the air conditioner to a desired setting value even when the air conditioner is in use, it is possible to realize an air conditioner in which controllability is not deteriorated.

The second invention also provides a method for uniquely setting membership functions used in fuzzy control by normalizing the deviation, the amount of change in the deviation, and the amount of change in the operation amount of the actuator using a normalization constant setting means and a normalization means. Fuzzy control can be performed simply by Furthermore, since it is standardized using a normalization constant, it can be standardized for various input data values simply by changing the normalization constant, so it can be used as a control system for various purposes.

Furthermore, in the third invention, since the amount of change in the operation amount of the actuator is standardized, even if the air condition adjustment control means such as the actuator changes, it can be handled by simply changing the standardization constant, further improving versatility. This is what I did.

As described above, the present invention makes it possible to realize a versatile air conditioner that is easy for users to use without deteriorating controllability even when the set values are changed or the characteristics of the controlled object change.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the configuration of an air conditioner according to an embodiment of the present invention, Fig. 2 is a graph showing a membership function used in the embodiment, and Fig. 3 is an operation of the air conditioner according to the embodiment. It is a flowchart which shows. 6... Air condition measuring means, 8... Actuator, 9... Air condition setting means, 10...
... Deviation calculation means, 11 ... Deviation change amount calculation means, 12 ... Standardization constant setting means, 13.
... Deviation standardization means, 14 ... Deviation change standardization means, 15 ... Control rule storage means, 1
6... Menpage Tsubu function storage means, 17.
...Fuzzy inference method. Name of agent: Patent attorney Shigetaka Awano et al. Figure 12

Claims (3)

[Claims] (1) An actuator that adjusts the air condition, an air condition measuring device that measures the air condition, an air condition setting device that sets a desired air condition, and a measured value by the air condition measuring device and the air condition setting. a deviation calculating means for calculating the deviation of the set value by the means for each fixed period, and a deviation change amount calculating means for calculating the amount of change in the deviation of the deviation calculated by the deviation calculating means for each fixed period, The actuator operation amount is set using a fuzzy rule that determines the amount of change in the actuator operation amount from the deviation, the amount of change in the deviation, and the amount of change in the actuator operation amount from the deviation and the amount of change in the deviation. An air conditioner comprising fuzzy control means for determining the amount of change in the actuator and operating the actuator. (2) a normalization constant setting means, and a deviation normalized by the normalization constant set by the normalization constant setting means;
normalizing means for calculating each of the amount of change in the deviation and the amount of change in the actuator operation amount, wherein the membership function according to claim 1 calculates the standardized deviation, the amount of change in the deviation, and the amount of actuator operation. 2. The air conditioner according to claim 1, wherein the change amount is the only one common to each of the amounts of change. (3) The fuzzy control means determines the amount of change in the standardized actuator operation amount, and the normalized amount of change in the actuator operation amount is set by the normalization constant setting means according to claim 2. 3. The air conditioner according to claim 2, further comprising operation amount change calculation means for calculating the amount of change in the actuator operation amount from a constant amount of change in the operation amount of the actuator.