JPH06137635A - Control method of air conditioner - Google Patents

Abstract

(57) [Abstract] [Purpose] In fuzzy control of an air conditioner, it is intended to suppress deterioration of power consumption efficiency and improve comfort. [Structure] This air conditioner has a membership function (A) that exhibits intermediate characteristics for both stability of room temperature and responsiveness to rapid changes in room temperature as a membership function used for fuzzy control. In addition, even if the room temperature is slightly higher or lower than the set temperature, the temperature difference between the room temperature and the set temperature is regarded as zero (zero), and the membership function (B) that makes it difficult for the compressor to be turned off is described. The number of times the operation of the one membership function unit 4 and the compressor 2 is turned off is detected at every predetermined time. If the number of detections exceeds a predetermined value, the compressor is turned on and off frequently. A control device 6 having a compressor operating state determination unit 5 that determines that the compressor 2 is in operation is provided, and switches to the membership function when the compressor 2 is frequently turned on and off.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of controlling an air conditioner in an inverter type air conditioner using fuzzy control for room temperature control.

[0002]

2. Description of the Related Art In recent years, in the control method of this type of air conditioner, as shown in FIG. 6, in order to perform fuzzy control of the room temperature (room temperature), for example, the following formula 1
Control rules shown in (a) to (f) and FIGS. 7 to 9
The membership function unit 1 having the membership function (A) shown in FIG. 2 is provided, and the switching amount of the operating frequency of the compressor 2 is controlled according to the control rule and the fuzzy calculation result using the membership function (A). The controller 3 is provided, the temperature difference between the room temperature (Tr) and the set temperature (Ts) is input 1, the change amount of the room temperature is input 2, and referring to the membership function (A), the inputs 1 and 2 are Calculate the degree to satisfy the control rule (perform fuzzy operation).

[0003]

[Equation 1] In the above equations 1 (a) to (f), the input variable E of the antecedent part of the control rule is (Tr-Ts), and the input variable D
Is the change amount of the room temperature (for example, (Tr1-Tr2) / min), the output variable F of the subject part is the switching amount of the operating frequency of the compressor, D is the change amount of the room temperature, and E is the temperature difference T
r-Ts), and F is the switching amount of the operating frequency of the compressor. Further, in the schematic view of the membership function (A) shown in the above mathematical expression 1 and FIGS. 7 to 8, NB is larger in the negative direction, ZR is zero (no change), and PB is greatly changed in the positive direction. Is.

In order to exhibit intermediate characteristics with respect to both the room temperature stability and the responsiveness to abrupt changes in the room due to disturbances (opening and closing of doors and windows), the control rule of the above equation 1 and The membership function (A) shown in FIGS. 7 to 9 has been determined. Further, the control device 3 controls the indoor fan, the outdoor fan and the like based on the room temperature, the set temperature and the like.

[0005]

In the air conditioner control method described above, when the air conditioning load is small, for example, when the outside air temperature is extremely low during the cooling operation or when the outside air temperature is extremely high during the heating operation, As shown in FIG. 10, the compressor 2 is frequently turned off (on / off) to stabilize the room temperature, and the room temperature is set near the set temperature.

However, since the electric power at the time of starting the compressor 2 becomes large, if the operation of the compressor 2 is frequently turned off, the power consumption of the air conditioner becomes large and the power consumption efficiency deteriorates. There was a drawback to do.

Further, as shown in a region A of FIG. 10, when the compressor 2 is frequently turned off, the fluctuation range of the room temperature control becomes large, that is, the room temperature is in the positive and negative directions with respect to the set temperature. Since the temperature fluctuates greatly, the room temperature falls below the set temperature due to the operation being turned off (OFF) during heating operation, making people feel cold, and further, the control emphasizing the set temperature is continued as it is, resulting in impaired comfort. There was a problem.

The present invention has been made in view of the above problems, and an object thereof is to suppress deterioration of power consumption efficiency of the air conditioner and improve comfort even when the air conditioning load is small. Another object of the present invention is to provide a control method of an air conditioner that can be performed.

[0009]

In order to achieve the above object, the present invention controls an indoor fan, an outdoor fan, and a compressor constituting a refrigeration cycle based on at least an indoor temperature and a set temperature to cool indoor air. Alternatively, when hot air is blown to control the temperature in the same room, the temperature difference between the detected room temperature and the set temperature is input 1, and the amount of change in the room temperature is input 2, and based on these inputs 1 and 2, A control method for an air conditioner, in which a fuzzy operation is performed using a preset control rule and a membership function, and the switching amount of the operating frequency of the compressor is controlled based on the fuzzy operation result. In addition to the above, the temperature difference between the room temperature and the set temperature is regarded as zero (zero) even if the room temperature is slightly higher or lower than the set temperature, and One compression function (B) that makes it difficult for the compressor to be turned off and the number of times the compressor is turned off are detected every predetermined time, and the operating state of the compressor is determined based on the detected number of times the compressor is turned off. A machine operation determination means is provided, and when the number of times the compressor is turned off exceeds a predetermined number, the membership function (B) is switched to and fuzzy arithmetic is performed using the switched membership function. Is the gist.

[0010]

Since the above method is adopted, for example, when the air-conditioning load of the air conditioner is small, if the number of operation-off times of the compressor detected in the predetermined time exceeds the predetermined value in the predetermined time, It is determined that the air conditioner is frequently turned on and off, that is, it is determined that the power consumption of the air conditioner is large. By this determination, the membership function used for the room temperature control is switched to the membership function (B), and the fuzzy operation is executed based on the switched membership function (B).

In the pattern of the switched membership function (B), the room temperature is slightly higher than the set temperature,
Or even if it is low, the temperature difference between the room temperature and the set temperature is regarded as zero, and it is difficult for the compressor to be turned off. Since it is difficult to turn off the operation, the room temperature is slightly higher than the set temperature, but the power consumption of the air conditioner is suppressed and the room temperature is stabilized, for example, making people feel cold during heating operation. And comfort is not compromised.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An air conditioner control method according to the present invention has an input of 1.
A fuzzy calculation is performed based on (room temperature and set temperature) and input 2 (change amount of room temperature) to control the switching amount of the operating frequency of the output compressor, and a plurality of patterns are used as membership functions for fuzzy control. For example, in addition to the membership function (A) that exhibits intermediate characteristics with respect to both room temperature stability and responsiveness to rapid changes in room temperature due to disturbance (opening and closing of doors and windows), at least the set temperature On the other hand, even if the room temperature is slightly higher or lower, the temperature difference between the room temperature and the set temperature is regarded as zero (zero), and there is one membership function (B) that makes it difficult for the compressor to turn off. The number of times the compressor is turned off is detected every predetermined time, and if this number of detections exceeds a predetermined value, it is determined that the compressor is turned on and off frequently. Tsuma It determines that the power consumption of the air conditioner increases, and fuzzy calculation is switched to the membership function (B), performed at room temperature control based on the fuzzy operation results. In the fuzzy control, the control rules shown in the equations 1 (a) to (f) are used.

Therefore, as shown in FIG. 1, the air conditioner to which the control method of the present invention is applied has a control rule and two membership functions (A), (A) to (f). The membership function unit 4 having (B) and the number of operation off of the compressor 3 are detected every predetermined time (t minutes), and it is determined whether or not the detected number of operation off exceeds a predetermined value. The control device 6 having the compressor operating state determination unit 5 is provided, and the temperature difference between the room temperature (room temperature; Tr) and the set temperature (Ts) is input 1 and the change amount of the room temperature (Tr) is input 2. When performing the fuzzy calculation, the membership function is switched based on the determination result of the compressor operating state determination unit 6, and the fuzzy calculation is executed based on the switched membership function and control rule (shown in Equation 1). . In the figure, the same parts as those in FIG. 6 are designated by the same reference numerals, and duplicate description will be omitted.

The membership function (B) has the patterns shown in, for example, FIGS. 2 to 4, and comparing these patterns with the patterns of the membership function (A) shown in FIGS. As is apparent, in the pattern of FIG. 2, the ZR region is strong with respect to the temperature difference between the room temperature and the set temperature, and is located in the large positive direction, and the PB region is weak.

This is the room temperature (T
Even if r) is slightly higher, the temperature difference between the room temperature and the set temperature is detected to be almost zero. Also,
In the pattern of FIG. 4, both the NB region and the PB region are weak with respect to the switching amount of the operating frequency of the compressor 2.

The pattern shown in FIG. 3 is the same as the pattern shown in FIG. 8, and the membership function (A) is the same as the patterns shown in FIGS. .

Next, the control method applied to the air conditioner having the above-mentioned structure will be described in detail with reference to the graph of FIG. 5. First, the heating operation of the air conditioner, for example, the set temperature and room temperature by the remote controller are controlled. The indoor fan, the outdoor fan, the compressor 2 and the like are controlled based on this.

In the control device 6, fuzzy calculation is executed using the membership function (A) shown in FIGS. 7 to 9, and room temperature control is performed based on the result of this fuzzy calculation (region of FIG. 5). C). At this time,
In the compressor operating state determination unit 5 of the control device 6,
When the operation off of the compressor 2 is detected (arrow in FIG. 5), the operation off is counted and stored in the memory of the control device (the microcomputer including the control device 6) of the air conditioner, and predetermined. The count number (the number of operation OFFs) is calculated for each time (t). When the calculated operation-off count exceeds the predetermined value n, the compressor 2 is frequently turned on and off, and it is determined that the power consumption of the air conditioner is large. Further, when the calculated operation-off count does not exceed the predetermined value n, it is determined that the compressor 2 is not turned on and off frequently, and the power consumption of the air conditioner is not large. It should be noted that the count number of the operation off times is reset after the predetermined time (t), and the operation off times at the new predetermined time (t) are counted.

At point B in FIG. 5, when the calculated number of times of operation OFF exceeds the predetermined value n, the compressor 2 is frequently turned on and off, and the efficiency of power consumption of the air conditioner deteriorates. Therefore, the membership function is switched to the membership function (B), and the fuzzy operation is executed using the switched membership function (B) (area D in FIG. 5). Since this membership function (B) senses the temperature difference between the room temperature and the set temperature as substantially zero (zero) regardless of whether the room temperature is slightly higher or lower than the set temperature, switching of the output operating frequency is performed. The effect on quantity is reduced.

That is, even if the room temperature becomes higher than the set temperature, the compressor 2 is not easily turned off. Therefore, as shown in the area D of FIG. 5, the room temperature becomes stable above the set temperature. However, the power consumption of the air conditioner is suppressed and the power consumption efficiency does not deteriorate. Also,
Since the compressor 2 is not frequently turned on and off, the room temperature does not fluctuate vertically with respect to the set temperature,
That is, since the fluctuation range can be reduced, comfort can be improved.

If the calculated number of times the operation is turned off does not exceed the predetermined value n, the compressor 2 is not turned on and off frequently, and the power consumption of the air conditioner does not increase. The fuzzy operation using the membership function (A) is continuously executed. Further, in the above embodiment, the case of the heating operation is explained, but it can be applied during the cooling operation.

As described above, in the fuzzy control method for the air conditioner, the number of times the compressor 2 is turned off is detected every predetermined time (t minutes), and when the number of times the operation is turned off exceeds the predetermined value n, the number of times the operation is turned off is detected. It is determined that the power consumption of the air conditioner is large and the fluctuation range of the room temperature control is large, and the membership function used in the fuzzy calculation is set to a temperature slightly higher or lower than the set temperature. Since the difference is regarded as zero and the compressor is switched to the membership function that makes it difficult to turn off the operation, it is possible to suppress the efficiency deterioration of the power consumption of the air conditioner and improve the comfort. it can.

Although the two membership functions are switched in the above embodiment, a plurality of different membership functions may be prepared according to the number of times the compressor 2 is turned off. By switching the membership function according to the number of times the compressor 2 is turned off,
The power consumption of the air conditioner can be finely controlled, the room temperature control can be finely controlled, and the comfort can be further improved.

[0024]

As described above, according to the control method of the air conditioner of the present invention, the fuzzy operation is performed based on the input 1 (room temperature and set temperature) and the input 2 (change amount of room temperature) to obtain the output. Controls the switching amount of the operating frequency of the compressor, and uses multiple patterns as a membership function used for fuzzy control, such as room temperature stability, for sudden changes in room temperature due to disturbances (doors and windows opening and closing), etc. In addition to the membership function (A), which exhibits intermediate characteristics for both responsiveness, the temperature difference between the room temperature and the set temperature is zero (zero) even if the room temperature is slightly higher or lower than the set temperature. ), And has one membership function (B) that makes it difficult for the compressor to be turned off, and detects the number of times the compressor is turned off at every predetermined time.
If the number of times of detection exceeds a predetermined value, it is determined that the compressor is frequently turned on and off, that is, it is determined that the power consumption of the air conditioner increases.
Since the membership function (B) is switched to perform fuzzy calculation, and the room temperature control is performed based on the fuzzy calculation result, it is possible to suppress deterioration of power consumption efficiency of the air conditioner, and to reduce the efficiency of the compressor. Since the room temperature is not frequently turned on and off, the room temperature does not fluctuate in the vertical direction with respect to the set temperature, that is, the fluctuation range of the room temperature control can be reduced, so that comfort can be improved.

[Brief description of drawings]

FIG. 1 is a schematic partial block diagram of an air conditioner to which an air conditioner control method according to an embodiment of the present invention is applied.

FIG. 2 is a schematic diagram of a membership function used in the control method for an air conditioner of the present invention.

FIG. 3 is a schematic diagram of a membership function used in the control method for an air conditioner of the present invention.

FIG. 4 is a schematic diagram of a membership function used in the control method for an air conditioner of the present invention.

FIG. 5 is a schematic graph illustrating room temperature and frequency switching according to the control method for an air conditioner of the present invention.

FIG. 6 is a schematic partial block diagram of an air conditioner to which a conventional air conditioner control method is applied.

FIG. 7 is a schematic diagram of a membership function used in a conventional air conditioner control method.

FIG. 8 is a schematic diagram of a membership function used in a conventional air conditioner control method.

FIG. 9 is a schematic diagram of a membership function used in a conventional air conditioner control method.

FIG. 10 is a schematic graph illustrating switching between room temperature and frequency by a conventional air conditioner control method.

[Explanation of symbols]

2 compressor 4 membership function part (membership function (A),
(B)) 5 Compressor operating state determination unit 6 Control device

Claims (1)

[Claims] 1. When controlling an indoor fan, an outdoor fan, and a compressor constituting a refrigeration cycle based on at least the indoor temperature and a set temperature, and controlling the temperature in the room by blowing cold air or warm air into the room, The temperature difference between the detected room temperature and the set temperature is input 1, the amount of change in the room temperature is input 2, and fuzzy using a control rule and a membership function preset based on these inputs 1 and 2. A method for controlling an air conditioner for performing a calculation and controlling the switching amount of the operating frequency of the compressor according to the fuzzy calculation result, wherein the room temperature is slightly higher than at least the set temperature in addition to the membership function, or One membership function that considers the temperature difference between the room temperature and the set temperature to be at least zero, and makes it difficult for the compressor to turn off. (B)
And detecting the number of times the compressor is turned off at predetermined intervals,
And a compressor operation determination means for determining the operating state of the compressor based on the number of times the detection operation is turned off. When the number of times the compressor is turned off exceeds a predetermined number, the membership function (B)
And a fuzzy operation using the switched membership function.