JP2002349936A - Control method for air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure reliability in a control method for an air conditioner by uniquely determining the degree of opening of an expansion valve, in response to the number of operation revolutions of a compressor. SOLUTION: In a control method for an air conditioner for controlling the degree of opening of an expansion value constituting a freezing cycle, a frequency zone corresponding to the number of operations is decided (ST3), and the degree of opening in response to the selected frequency zone is read with reference to a degree-of-opening table, and the expansion valve is controlled to the read degree of opening (ST4). Fresh air temperature is detected, and a zone corresponding to the fresh air temperature is decided (ST5). When the decided zone lies in Y zone of intermediate temperature, the present degree of opening of the expansion valve is kept unchanged (ST6, ST7). When the decided zone lies in X zone of low temperature, -5 pulses are added to the present degree of opening (fixed pulse) to control the expansion valve to a drawing direction (ST8); and when the zone is a Z zone of high temperature, +10 pulses are added to the present degree of opening (fixed pulse) to control the expansion valve in the direction of opening (ST11).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for controlling an expansion valve (electronic expansion valve) of a refrigerant flow rate adjusting means constituting a refrigeration cycle of an air conditioner, and more particularly, to uniquely controlling an expansion valve. The present invention relates to a method of controlling an air conditioner to be performed.

[0002]

2. Description of the Related Art As shown in FIG. 6, for example, an air conditioner has a refrigeration cycle including a compressor 1, a four-way valve 2, an indoor heat exchanger 3, an outdoor heat exchanger 4, an electronic expansion valve 5, and the like. The four-way valve 2 is switched according to the cooling operation (including the drain operation) or the heating operation, and the refrigerant is circulated in a predetermined manner to control the room temperature.

For this purpose, as shown in FIG. 7, this air conditioner includes an indoor unit control unit 6 and an outdoor unit control unit 7 including a microcomputer and a drive circuit. Controls the indoor fan 9 in accordance with the above, and transmits a predetermined command (such as an operating frequency according to the difference between the room temperature and the set value) to the outdoor unit controller 7.
The outdoor unit control unit 7 controls the compressor 1, the four-way valve 2, the electronic expansion valve 5, the outdoor fan 10, and the like according to the command.

This air conditioner has various sensors,
For example, an indoor temperature sensor 11, an indoor heat exchange sensor 12 for detecting a heat exchange temperature of the indoor heat exchanger 3 (for example, an intermediate temperature of the heat exchanger), a suction sensor 13 for detecting a suction temperature of the compressor 1, and an outdoor heat exchange Outdoor heat exchange sensor 14 for detecting the heat exchange temperature of the heat exchanger 4 (for example, the intermediate temperature of the heat exchanger)
It has.

[0005] In this case, the outdoor unit control unit 6 performs control (compressor operation frequency command) necessary for controlling the room temperature so that the room temperature becomes the set temperature of the remote controller 8. The required parts are controlled according to the command.

[0006] For example, in the cooling operation, the outdoor unit controller 7 sets a difference ((SH) amount: superheat amount) between the suction temperature and the evaporation temperature of the indoor heat exchanger 3 to a constant value (target value; for example, 3 deg.) Is performed. That is, the degree of opening and closing of the electronic expansion valve 5 is adjusted to a predetermined value, thereby stabilizing the refrigeration cycle. In the heating operation, the superheat control is performed so that the difference between the suction temperature and the evaporation temperature of the outdoor heat exchanger 4 ((SH) amount) is adjusted to the target value.

[0007]

In the control method of the air conditioner, the difference between the indoor heat exchange temperature and the suction temperature is determined.
Alternatively, since the electronic expansion valve 5 is controlled by the difference between the suction temperature and the outdoor heat exchange temperature, the number of operations of the electronic expansion valve 5 increases, which is not preferable from the viewpoint of durability.

The indoor heat exchange sensor 12, the suction sensor 13, and the outdoor heat exchange sensor 14 vary in detection error. If the variation is large, the superheat control may not be performed properly. For this reason, stabilization of the refrigeration cycle is hindered, leading to a reduction in reliability. Further, since a plurality of temperature sensors are required, there is a disadvantage that the cost is increased accordingly.

The present invention has been made in view of the above-mentioned problems, and has as its object the purpose of using the detected temperature difference without using the detected temperature difference.
Uniquely controls the degree of opening and closing of the expansion valve to increase durability, stabilize the refrigeration cycle to improve reliability, reduce costs, and operate the compressor against load fluctuations. An object of the present invention is to provide an air conditioner control method capable of ensuring reliability.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to an air conditioner that controls the degree of opening and closing of an expansion valve constituting a refrigeration cycle, operates the refrigeration cycle, and controls room temperature. In the control method, the operating speed range of the compressor constituting the refrigeration cycle is divided into a plurality of frequency zones, an opening / closing degree table in which the opening / closing degree of the expansion valve is set for each frequency zone, and the outside air temperature is set to a plurality of zones. And a correction table for correcting the opening / closing degree table for each outside air temperature zone.When the refrigeration cycle is operating, a frequency zone corresponding to the operating speed of the compressor is determined, and The opening / closing degree corresponding to the determined frequency zone is read out with reference to the opening / closing degree table, and the expansion valve is controlled in accordance with the opening / closing degree. While correcting the current opening degree of the expansion valve by referring to a table correction value corresponding to the current outside air temperature, it is characterized in that so as to control the expansion valve so that the corrected opening degree.

According to the method of controlling an air conditioner of the present invention, the operating speed range of the compressor constituting the refrigeration cycle is divided into a plurality of frequency zones, and the opening / closing degree of the expansion valve is set for each frequency zone. A degree table and a correction table for correcting the open / close degree table for each of the outside air temperature zones and for each of the operating speeds of the compressor for each of the outside air temperature zones. During the operation of the cycle, the frequency zone corresponding to the operating speed of the compressor is determined, and the opening / closing degree corresponding to the determined frequency zone is read out with reference to the opening / closing degree table, and Control the expansion valve,
With reference to the correction table, the current opening / closing degree of the expansion valve is corrected by a correction value corresponding to the current outside air temperature and the current operation speed, and the expansion valve is controlled to have the corrected opening / closing degree. It is characterized by doing.

The plurality of frequency zones may be different between when the operating frequency of the compressor is raised and when it is lowered, and the frequency when the frequency is lowered is preferably lower than when the frequency is raised. In addition, it is preferable to provide a differential for dividing the outside air temperature into a plurality of zones. Thus, in the control of the electronic expansion valve, the control is appropriately performed without causing any hinting.

The value of the correction table is preferably such that the higher the outside air temperature, the larger the degree of opening of the expansion valve, and the lower the outside air temperature, the smaller the degree of opening of the expansion valve. This allows
For example, when the outside air temperature is high, the opening of the expansion valve is increased, so that an increase in the discharge temperature and empty defrost are avoided, and optimal cooling control according to a load change due to a change in outside air temperature is realized.

The value of the correction table is such that the opening degree of the expansion valve increases as the outside air temperature increases, and the opening degree of the expansion valve decreases as the outside air temperature decreases, and the operating speed of the compressor increases. , The opening degree of the expansion valve should be smaller. Thus, in addition to the above-described operation, when the correction is performed in the entire rotation speed region of the compressor, for example, when the rotation speed is set based on the high rotation speed region of the compressor, a slow cooling in the low rotation speed region is caused. Is avoided.

[0015]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to FIG. In FIG. 2, the same parts as those in FIG. 7 are denoted by the same reference numerals, and the duplicate description will be omitted. See FIG. 6 for the configuration of the refrigeration cycle.

In FIG. 2, the control device to which the control method of the air conditioner of the present invention is applied divides the operating speed range of the compressor 1 into a plurality of frequency zones (see FIG. 3), The fixed pulse of the expansion valve 5 (opening / closing degree) is uniquely set, and the fixed pulse of the open / closed degree table according to the outside air temperature (see FIG. 4) divided into a plurality of zones is shown in Table 2 below. Alternatively, a correction table of the following Table 4 set for correcting to a value of the following Table 3 is stored in the internal memory 20a, and an outdoor controller for controlling the degree of opening and closing of the electronic expansion valve 5 according to at least Table 1, Table 2, or Table 3 Unit control unit (also has the function of the outdoor unit control unit 7) 2
An outside air temperature sensor 21 for detecting 0 and the outside air temperature is provided.

[0017]

[Table 1]

[0018]

[Table 2]

[0019]

[Table 3]

[0020]

[Table 4]

Referring to Table 1, the operating speed range of the compressor 1 is divided into a plurality of frequency zones A to P.
Increase the number of fixed pulses (increase the degree of opening).

As shown in FIG. 3, the frequency zones are assigned differently when the operating frequency is increasing and when the operating frequency is decreasing, and when the operating frequency is lowered, the frequency zone is set lower than that when the operating frequency is increased. In addition, the control of the electronic expansion valve 5 has hysteresis. It should be noted that the frequency zones in the low operating speed range are assigned the same at the time of ascending and at the time of descending.

Table 2 shows fixed pulses of the electronic expansion valve 5 used when the outside air temperature is in the Z zone.
7 is a fixed pulse obtained by correcting Table 1 using the correction value of (1). Table 3 above is a fixed pulse of the electronic expansion valve 5 used when the outside air temperature is in the X zone, and is a fixed pulse obtained by correcting Table 1 using the correction value of Table 4 above. Therefore, Table 1
Is an electronic expansion valve 5 used when the outside air temperature is in the Y zone.
Fixed pulse.

Table 4 shows correction values for correcting the fixed pulses in Table 1 according to the outside air temperature. Thus, the tables of Table 1 and Table 4 may be stored in the internal memory 20a. As shown in FIG. 4, the above-mentioned outside air temperature zone is provided with a high differential when the outside air temperature increases and a low differential when the outside air temperature decreases. Thereby, hunting of the electronic expansion valve 5 is prevented. In addition, Table 4 above shows Table 2
As is clear from Table 3 and Table 3, it is preferable to use it during the heating operation.

Next, the operation of the control device having the above configuration will be described with reference to the flowchart of FIG. First, it is assumed that an operation (for example, a heating operation) is performed by the remote controller 8. The indoor unit controller 6 reads the room temperature detected by the room temperature sensor 11, the set temperature and the operation mode by the remote controller 8 (step ST1), and determines the operation frequency (the number of revolutions) of the compressor 1 based on the difference between the set temperature and the room temperature. Is determined (step ST2), the operation speed, the operation mode, and the like are transmitted to the outdoor unit control unit 20, while the rotation of the indoor fan 9 is controlled.

The outdoor unit control unit 20 controls the compressor 1, the four-way valve 2, the electronic expansion valve 5 according to an instruction from the indoor unit control unit 6.
And the outdoor fan 10 and the like are controlled. In this way,
The refrigeration cycle is operated according to the setting operation of the remote controller 8 to control the room temperature.

At this time, the outdoor unit controller 20 controls the compressor 1
Is determined (step ST3), a fixed pulse corresponding to the frequency zone is read out with reference to the opening / closing degree table of Table 1, and the opening / closing degree of the electronic expansion valve 5 is determined according to the fixed pulse. Is controlled (step ST4). For example, when the operating speed of the compressor 1 in the heating operation is in the frequency zone H, the electronic expansion valve 5 is controlled so that the degree of opening and closing of the fixed pulse 13 is maintained.

Subsequently, the outside air temperature is detected, and it is determined whether or not the outside air temperature falls within any of the X, Y, and Z zones (step ST5). If it is determined that the outside air temperature is in the Y zone, the process returns to step ST4 via steps ST6 and ST7, and controls the degree of opening and closing of the electronic expansion valve 5 based on Table 1.

When the outside air temperature is in the X zone, the process proceeds from step ST6 to ST8, and the fixed pulse shown in Table 1 is corrected according to Table 4. For example, when the operation speed is in the frequency zone H, the current fixed pulse 13
Is controlled so that the opening / closing degree becomes a value obtained by adding -5 to (8; see Table 3). Therefore, when the outside air temperature is in the X zone, the opening / closing degree of the electronic expansion valve 5 is controlled according to the fixed pulse shown in Table 3.

Subsequently, the outside air temperature is detected again (step ST9), and it is determined whether this outside air temperature has entered another zone from the X zone (step ST10). When the outside air temperature enters a zone other than the X zone, the process returns to step ST4, and the above-described processing is repeated. That is, after the electronic expansion valve 5 is once controlled to the opening / closing degree according to the original fixed pulse (13 pulses; see Table 1), the zone where the outside air temperature is entered is determined, and the current fixed pulse is determined according to the determination result. Is corrected to control the degree of opening and closing of the electronic expansion valve 5.

On the other hand, when the outside air temperature enters the Y zone, steps ST4 to ST7 are executed as described above, and the degree of opening and closing of the electronic expansion valve 5 is controlled in accordance with the fixed pulse shown in Table 1. When the outside air temperature enters the Z zone, the process proceeds from step ST7 to ST11, where the correction value +10 in Table 4 is added to the current fixed pulse (see Table 1), and the electronic expansion valve 5 is operated in accordance with the corrected fixed pulse. The degree of opening and closing will be controlled.

Subsequently, the outside air temperature is detected again (step ST12), and it is determined whether or not this outside air temperature has entered another zone from the Z zone (step ST13). When the outside air temperature enters a zone other than the Z zone, the process returns to step ST4, and the above-described processing is repeated. It should be noted that if the operating speed of the compressor 1 is changed during the execution of the above-described processing, the processing may be executed from step ST3.

As described above, the operating speed (frequency) region of the compressor 1 is divided into a plurality of frequency zones, and the degree of opening and closing of the electronic expansion valve 5 is uniquely controlled according to the frequency zone. The frequency of controlling the degree of opening and closing of the electronic expansion valve 5 is lower than in the past. Therefore, the durability of the electronic expansion valve 5 is increased, and the reliability is improved.

Further, since the suction temperature, the indoor heat exchange temperature, and the outdoor heat exchange temperature are not used, the accuracy of the room temperature control due to the detection error of the temperature sensor does not decrease, and the accuracy can be improved. The cost can be reduced by not using it.

When the outside air temperature is neither high nor low (entering the Y zone), the fixed pulse shown in Table 1 is used as a reference. Corrects the fixed pulse shown in Table 1. Since this correction is performed in the direction in which the electronic expansion valve 5 is opened, the capacity of the internal memory 20a does not need to be increased. In addition, an increase in the discharge temperature of the compressor 1 and an empty defrost can be avoided.

Even when the outside air temperature becomes low and the vehicle enters the X zone, the fixed pulse shown in Table 1 is similarly corrected, and since the correction is performed in the direction to close the electronic expansion valve 5, the capacity of the internal memory 20a is reduced. There is no need to increase Also,
Since the difference ΔT between the condensation temperature and the compressor bottom temperature, which is a measure of the reliability of the compressor 1, is secured, the reliability can be improved.

In the above embodiment, the outside air temperature is divided into a low temperature X zone, an intermediate temperature Y zone and a high temperature Z zone. However, the outside air temperature may be divided into more zones. . In this case, the fixed pulse can be corrected more finely, and fine room temperature control can be performed.

FIG. 5 shows another embodiment of the present invention, and is a flowchart for explaining a method of controlling an air conditioner. In the figure, the same processes as those in FIG. 1 are denoted by the same reference numerals, and redundant description will be omitted. Also, refer to FIG. 2 for a control device to which the control method of the air conditioner is applied, and refer to the previous embodiment for other schematic diagrams (zone diagrams) and tables.

In FIG. 2, a control device to which the control method of the air conditioner is applied is an outdoor unit control unit 20 of the previous embodiment.
And a correction table shown in Table 5 below is stored in the internal memory 30a in place of the table shown in Table 1 and the table shown in Table 4, and the fixed pulse shown in Table 1 is corrected according to Table 5. And an outdoor unit control unit 30 for controlling the degree of opening and closing of the electronic expansion valve 5.

[0040]

[Table 5]

Referring to Table 5, the correction value of the fixed pulse is used in place of Table 4, and the correction value is different when the operating speed is in the low range and in the high range. Is set to

When the operating speed is in a low range (for example, 30 rps or less), if the outside air temperature is high, the correction amount of the fixed pulse in Table 1 is made smaller than that in Table 4. That is, the amount of opening of the electronic expansion valve 5 in the opening direction is made smaller than that in Table 4. If the outside air temperature is low, the correction amount of the fixed pulse in Table 1 is made larger than the correction value in Table 4. That is, the amount of the electronic expansion valve 5 in the closing direction is made larger than in Table 4.

When the operating rotation speed is in a high range (for example, 31 rps or more), the correction amount of the fixed pulse shown in Table 1 is set in Table 4.
And the same as In addition, the above-mentioned Table 5 is similar to the previous example,
It is preferable to use it during the heating operation.

Next, the operation of the control device having the above configuration will be described in detail with reference to the flowchart of FIG. Note that detailed description of the same processes as in the previous embodiment (see FIG. 1) will be omitted.

First, it is assumed that an operation (for example, a heating operation) is performed by the remote controller 8. The indoor unit control unit 6 transmits the operation speed, the operation mode, and the like determined by the processing in steps ST1 and ST2 to the outdoor unit control unit 30, while controlling the rotation of the indoor fan 9 and the outdoor unit control unit 30.
Controls the compressor 1, the four-way valve 2, the electronic expansion valve 5, the outdoor fan 10, and the like. As described above, the refrigeration cycle is operated according to the setting operation of the remote controller 8 to control the room temperature.

At this time, the outdoor unit control unit 30 determines the fixed pulse by referring to the above Table 1 based on the frequency zone corresponding to the operating speed of the compressor 1 by the processing of steps ST3 and ST4. The degree of opening and closing of the electronic expansion valve 5 is controlled according to the fixed pulse.

Subsequently, the outside air temperature is detected, and it is determined whether or not the outside air temperature falls within any of the X, Y, and Z zones (step ST5). Assuming that the outside air temperature is in the Y zone, the process returns to step ST4 via steps ST6 and ST7. That is, the degree of opening and closing of the electronic expansion valve 5 is controlled based on Table 1.

When the outside air temperature is in the X zone, the process proceeds from step ST6 to ST20, and it is determined whether or not the operation speed is equal to or lower than a predetermined value (for example, 30 rps). When the operation speed is 30 rps or less, -7 pulses are added to the current fixed pulse according to Table 5 above,
The degree of opening and closing of the electronic expansion valve 5 is controlled using the corrected fixed pulse (step ST21). For example, when the operation speed is in the frequency zone H, the current fixed pulse 1
The opening / closing degree is controlled to a value obtained by adding -7 to 3 (pulse 6).

If the operation speed is equal to or higher than 31 rps, the process proceeds from step ST20 to ST22, and -5 pulses are added to the current fixed pulse according to Table 5 above. For example, when the operation speed is in the frequency zone H, the opening / closing degree is controlled to a value (pulse 8) obtained by adding -5 to the current fixed pulse 13.

Subsequently, the outside air temperature is detected again (step ST9), and it is determined whether or not the outside air temperature has entered another zone from the X zone (step ST10). Outside air temperature is X
When entering a zone other than the zone, the process returns to step ST4 to execute the same processing as in the previous embodiment. That is, after the electronic expansion valve 5 is once controlled to the opening / closing degree according to the original fixed pulse (13 pulses; see Table 1), the zone where the outside air temperature is entered is determined, and the current fixed pulse is determined according to the determination result. And the degree of opening and closing of the electronic expansion valve 5 is controlled.

On the other hand, when the outside air temperature enters the Y zone, steps ST4 to ST7 are executed as described above, and the degree of opening and closing of the electronic expansion valve 5 is controlled in accordance with the fixed pulse shown in Table 1.

When the outside air temperature has entered the Z zone, the process proceeds from step ST7 to ST23, and it is determined whether or not the operating speed is equal to or lower than a predetermined value (for example, 30 rps). When the operation speed is 30 rps or less, +7 pulses are added to the current fixed pulse according to Table 5 above.
The degree of opening and closing of the electronic expansion valve 5 is controlled using the corrected fixed pulse (step ST24). For example, when the operation speed is in the frequency zone H, the current fixed pulse 1
Control is performed so that the opening / closing degree becomes a value obtained by adding +7 to 3 (pulse 20).

Subsequently, the outside air temperature is detected again (step ST12), and it is determined whether the outside air temperature has entered another zone from the Z zone (step ST13). When the outside air temperature enters a zone other than the Z zone, the process returns to step ST4 as in the previous embodiment, and the above-described processing is repeated.

As described above, when the fixed pulse of the electronic expansion valve 5 is corrected, not only the outside air temperature but also the operation speed of the compressor 1 is taken into account, so that the same effect as that of the previous embodiment is exerted. In particular, when the outside air temperature is low in the low rotation speed region, the correction amount of the fixed pulse is larger (larger aperture) than in the previous embodiment, and when the outside air temperature is high, the correction amount of the fixed pulse is higher than in the previous embodiment. Is reduced, and when the high-speed region of the compressor 1 is set as a reference, the cooling does not become loose in the low-speed region during the heating operation.
Therefore, comfort is not impaired.

In the other embodiments described above, the correction value of the fixed pulse is changed in two regions where the operating rotation speed is 30 rps or less and 31 rps or more. You may make it set. In this case, the fixed pulse can be corrected more finely, and fine room temperature control can be performed.

[0056]

As described above, the present invention has the following effects. The control method of the air conditioner of the present invention,
Dividing the operating speed range of the compressor into multiple frequency zones,
An opening / closing degree table in which the opening / closing degree of the electronic expansion valve is set for each frequency zone, and a correction table for dividing the outside air temperature into a plurality of zones and correcting the opening / closing degree table for each outside air temperature zone are stored. Controls the electronic expansion valve according to the opening / closing degree corresponding to the frequency zone corresponding to the operating speed of the compressor, and corrects the current opening / closing degree of the electronic expansion valve with a correction value corresponding to the current outside air temperature with reference to a correction table. However, since the electronic expansion valve is controlled to have the corrected opening / closing degree, the frequency of the electronic expansion valve opening / closing degree control is reduced by uniquely controlling the electronic expansion valve opening / closing degree. In addition, not only the durability of the electronic expansion valve can be enhanced, but also the refrigeration cycle can be stabilized. Therefore, the reliability of the air conditioner can be improved, and the cost can be reduced by eliminating the temperature sensor. Further, the reliability of the compressor can be ensured even with a load change due to the outside air temperature or the like, and there are some compressors that are particularly effective during the heating operation.

The method for controlling an air conditioner according to the present invention comprises an opening / closing degree table in which the operating speed range of the compressor is divided into a plurality of frequency zones, and the opening / closing degree of the electronic expansion valve is set for each frequency zone; The temperature is divided into a plurality of zones, and a correction table for correcting the opening / closing degree table is stored for each of the outside air temperature zones and for each of the operating speeds of the compressor. The electronic expansion valve is controlled by the opening / closing degree corresponding to the corresponding frequency zone, and the current opening / closing degree of the electronic expansion valve is corrected by a correction value corresponding to the current outside air temperature and the current operating speed with reference to a correction table. Since the electronic expansion valve is controlled so as to have the corrected opening / closing degree, in addition to the above-described effect, the cooling is not loosened in the low rotation speed region during the heating operation. , That there is no also be impaired comfort at the time of the heating operation.

[Brief description of the drawings]

FIG. 1 is a schematic flowchart illustrating a method for controlling an air conditioner according to an embodiment of the present invention.

FIG. 2 is a schematic block diagram of a control device according to the embodiment of the present invention, to which the control method of the air conditioner is applied.

FIG. 3 is a schematic diagram illustrating the operation of the control device shown in FIG. 2;

FIG. 4 is a schematic diagram illustrating the operation of the control device shown in FIG. 2;

FIG. 5 is a schematic flowchart illustrating a method for controlling an air conditioner according to another embodiment of the present invention.

FIG. 6 is a schematic configuration diagram for explaining a refrigeration cycle of a conventional air conditioner.

FIG. 7 is a schematic block diagram for explaining a control device of a conventional air conditioner.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 compressor 5 expansion valve (electronic expansion valve; valve means) 6 indoor unit control unit 7, 20, 30 outdoor unit control unit 20a, 30a internal memory 21 outside air temperature sensor

Claims (6)

[Claims] 1. A method for controlling an air conditioner that controls the degree of opening and closing of valve means constituting a refrigeration cycle to operate the refrigeration cycle and control room temperature, wherein the operating speed of a compressor constituting the refrigeration cycle is controlled. An area is divided into a plurality of frequency zones, an opening / closing degree table in which the opening / closing degree of the valve means is set for each frequency zone, and an outside air temperature is divided into a plurality of zones, and the opening / closing degree table is corrected for each outside air temperature zone. When operating the refrigeration cycle, a frequency zone corresponding to the operating speed of the compressor is determined, and the frequency zone corresponding to the determined frequency zone is referred to by referring to the opening / closing degree table. Reading the opening / closing degree, controlling the valve means according to the opening / closing degree, and referring to the correction table, using a correction value corresponding to the current outside air temperature. A method for controlling an air conditioner, characterized in that the current opening / closing degree of the valve means is corrected and the valve means is controlled so as to have the corrected opening / closing degree. 2. A method of controlling an air conditioner for controlling the opening / closing degree of valve means constituting a refrigeration cycle and operating the refrigeration cycle to control room temperature, wherein the operating speed of a compressor constituting the refrigeration cycle is controlled. The region is divided into a plurality of frequency zones, an opening / closing degree table in which the opening / closing degree of the valve means is set for each frequency zone, and the outside air temperature is divided into a plurality of zones, and for each outside air temperature zone, and the operation of the compressor And a correction table for correcting the opening / closing degree table for each rotation speed. During operation of the refrigeration cycle, a frequency zone corresponding to the operating rotation speed of the compressor is determined, and the opening / closing degree is determined. While reading the opening / closing degree according to the determined frequency zone by referring to the table, controlling the valve means to the opening / closing degree, and referring to the correction table. An air characterized in that the current opening / closing degree of the valve means is corrected by a correction value corresponding to a current outside air temperature and a current operation speed, and the valve means is controlled so as to have the corrected opening / closing degree. Harmonizer control method. 3. The compressor according to claim 1, wherein the plurality of frequency zones are different between when the operating frequency of the compressor is increased and when the operating frequency is decreased, and when the frequency is decreased when the operating frequency is increased.
The method for controlling an air conditioner according to item 1. 4. A system according to claim 1, wherein a plurality of zones of the outside air temperature are provided with a differential.
The method for controlling an air conditioner according to item 1. 5. The value of the correction table according to claim 1, wherein the opening degree of the valve means increases as the outside air temperature increases, and the opening degree of the valve means decreases as the outside air temperature decreases. The control method of the air conditioner according to the above. 6. The value of the correction table is such that the higher the outside air temperature, the larger the opening degree of the valve means, the lower the outside air temperature, the smaller the opening degree of the valve means, and the operating speed of the compressor. The control method for an air conditioner according to claim 2, wherein the opening degree of the valve means is made smaller as the air conditioner is lower.