JPH10306941A - Method for controlling air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve comfortableness by setting, a lowest rotational speed in response to input current of an outdoor unit, suppressing vibration of a compressor, ensuring safety, and delicately regulating a room temperature. SOLUTION: An outdoor unit controller 10 receiving an operating frequency code from an indoor unit controller 11 inverter-controls a compressor 4 for constituting a refrigerating cycle. When a command of a lowest rotational speed is received, the controller 10 operates the compressor 4 at a predetermined rotational speed for a time of a timer A of a timer part 10a, and then operates the compressor 4 at a higher lowest rotational speed for a time of a timer B. Thereafter, input current to an outdoor unit is detected, and when this current is less than a first set value, the compressor 4 is operated at the lowest rotational speed as a lower value for a time of a timer C. Thereafter, when the input current is a second set value or more, the lowest speed is returned to the higher value, the compressor 4 is operated, and this operation is executed for the time of the timer B. Then, the above operation is repeated until the command of the lowest speed from the controller 1 is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor control technique for an outdoor unit of an air conditioner (inverter air conditioner), and more particularly, to a method of controlling an air conditioner which can appropriately set a minimum rotation speed of the compressor. It is about.

[0002]

2. Description of the Related Art An air conditioner of this type circulates refrigerant obtained in a refrigeration cycle to an indoor heat exchanger, and blows out cold or hot air exchanged by the indoor heat exchanger into a room by an indoor fan. Control room temperature.

For example, as shown in FIG. 6, an outdoor unit control section 1 of an air conditioner operates an operating frequency of a compressor 4 constituting a refrigeration cycle in accordance with a set temperature of a remote controller 2 and a room temperature detected by an indoor temperature sensor section 3. Is determined, and the operating frequency is transferred to the outdoor unit control unit 5 by a code, while the indoor fan is controlled to rotate in a predetermined manner according to the air volume set by the remote controller 2. The outdoor unit controller 5 performs inverter control of the compressor 4 according to the operating frequency code from the indoor unit controller 1.

[0004] Then, a refrigerant having a predetermined temperature and pressure is obtained, and the predetermined refrigerant is circulated to the indoor heat exchanger via a capillary tube and an electronic expansion valve, and heat is exchanged in the indoor heat exchanger. Desired cold air or warm air is blown into the room by the rotation, and the indoor environment is kept comfortable.

When the load on the compressor 4 is heavy and the rotational speed of the compressor 4 is high to some extent, the vibration of the compressor 4 is small due to the effect of the moment of inertia. However, when the rotation speed of the compressor 4 is low, the vibration of the compressor 4 increases (the rotation speed becomes uneven due to the influence of torque fluctuation), and a crack or the like may occur in the piping. further,
For example, if the compressor motor is a brushless motor, the vibration of the compressor 3 (due to uneven rotation speed) adversely affects the rotor position detection control, and may not be able to perform appropriate control.

For this reason, the minimum number of revolutions of the compressor is set to a higher value (for example, 13 rps) in consideration of vibration under heavy load and stress of piping. Therefore, when the load on the compressor 4 is heavy, even if control is performed to set the rotation speed of the compressor 4 to the minimum rotation speed, the vibration of the compressor 4 is suppressed, and the pipe may be damaged. Therefore, the safety of the air conditioner is ensured, and the control of the compressor 4 is not adversely affected.

[0007]

However, in the method of controlling an air conditioner, even if the outside air temperature is high, the load on the compressor 4 is not always heavy, that is, the load may not be heavy. The rotation speed of the compressor 4 is limited to a higher minimum rotation speed, which is not preferable in terms of comfort. For example, when the room temperature is settled near the set temperature and the compressor 4 is controlled at a higher minimum rotation speed, or the compressor 4 is shut down,
The operation at the higher minimum rotation speed and the operation stop are repeated, and delicate room temperature adjustment cannot be performed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to pay attention to the fact that the load state can be determined based on the input current to the outdoor unit, and to determine the minimum rotational speed of the compressor according to the input current. By changing and setting
Provide a control method for an air conditioner that does not increase the vibration of the compressor and does not damage the piping etc. (ensures safety), allows delicate room temperature adjustment, and improves comfort. Is to do.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a control of an air conditioner in which at least a compressor constituting a refrigeration cycle is inverter-controlled to adjust a room temperature and maintain the room at a set temperature. The method is characterized in that an input current to an outdoor unit of the air conditioner is detected, and a minimum rotation speed of the compressor is varied and set according to the input current.

[0010] In the control method of the air conditioner according to the present invention, when the compressor is operating at a predetermined rotation speed, an input current to an outdoor unit of the air conditioner is detected, and the air current is detected in accordance with the input current. The minimum rotation speed of the compressor is variable and set.

In the control method for an air conditioner according to the present invention, when the compressor is operated at a minimum rotation speed, the compressor is operated at a predetermined rotation speed to detect an input current to an outdoor unit of the air conditioner. The minimum rotation speed of the compressor is varied and set according to the input current.

In the control method for an air conditioner according to the present invention, when the compressor is operated at a minimum rotation speed, the compressor is operated at a predetermined rotation speed for a predetermined time, and then the input current to the outdoor unit of the air conditioner is increased. Is detected, and the minimum rotation speed of the compressor is varied and set according to the input current.

In the method for controlling an air conditioner according to the present invention, when the compressor is operated at a minimum rotation speed, the compressor is operated at a predetermined rotation speed for a predetermined time, and then the input current to the outdoor unit of the air conditioner is detected. When the input current is equal to or higher than a predetermined value, the minimum rotation speed is variably set to a higher value, and when the input current is lower than a predetermined value, the minimum rotation speed is variably set to a lower value. And

In this case, when the compressor is operated at a higher minimum rotation speed for a predetermined time or more, an input current to the outdoor unit is detected, and the input current is less than a first predetermined value. The compressor may be variably set to a lower minimum rotation speed.

Further, when the compressor is operated at a lower minimum rotational speed for a predetermined time or more, an input current to the outdoor unit is detected, and when the input current is equal to or more than a second predetermined value, The compressor may be variably set to a higher minimum speed.

According to the present invention, there is provided a method of controlling an air conditioner in which at least a compressor constituting a refrigeration cycle is inverter-controlled and a room temperature is adjusted to maintain a room at a set temperature. After operating the compressor at a higher minimum rotation speed for a predetermined time, an input current to the outdoor unit of the air conditioner is detected, and when the input current is less than a third predetermined value, the minimum rotation speed is determined. It is characterized by being variable and set to a lower value.

In this case, after operating the compressor at a lower minimum rotational speed for a predetermined time or more, an input current to the outdoor unit is detected, and when the input current is equal to or more than a fourth predetermined value, the compressor is operated. May be varied and set to a higher minimum rotation speed.

After operating the compressor at a higher minimum rotation speed for a predetermined time or more, an input current to the outdoor unit is detected, and if the input current is not higher than a fourth predetermined value, the compressor is lowered to a lower minimum value. It is good to be variable and set to the number of rotations.

When an instruction other than the minimum rotational speed is issued while the compressor is operating at the minimum rotational speed, the compressor is operated in accordance with the instruction, and the minimum rotational speed is restarted during the operation. When instructed, it is preferable to operate the compressor after performing the above-described procedure.

Preferably, the minimum rotation speed of the compressor is varied and set according to which of the plurality of zones the input current to the outdoor unit enters.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the figure, the same parts as those in FIG.

In FIG. 1, an outdoor unit control unit 10 to which the air conditioner control method of the present invention is applied has a function of an input unit (not shown) other than the function of the outdoor unit control unit 5 shown in FIG. That is, means for detecting a value corresponding to the power consumption of the outdoor unit, and a higher value (for example, 13 rps) and a lower value (for example, 9 rps) of the minimum rotational speed according to the detected input current.
And a control circuit 10 having timer sections 10a of timers A, B, and C used for the variable and setting.
b.

In the case of an air conditioner having a current detecting means (CT) for detecting an input current to the outdoor unit, the current detecting means may be used. The outdoor unit controller 11 has the function of the indoor unit controller 1 shown in FIG. 6, and the AC power is also supplied to the outdoor unit via the indoor unit.

Next, a method for controlling an air conditioner according to the present invention will be described with reference to flowcharts shown in FIGS. 2 and 3. First, it is assumed that the air conditioner is operated.

Then, similarly to the related art, the outdoor unit control unit 11 controls the rotation of the indoor fan in response to, for example, the operation of the remote controller 2, and transmits a command (such as an operating frequency code) to the outdoor unit control unit 10. The outdoor unit controller 10 controls the rotation of the compressor 4 according to the operating frequency code, and controls the electronic expansion valve and the outdoor fan.

At this time, when the compressor 4 is started in response to a command from the indoor unit controller 11, the outdoor unit controller 10 proceeds from step ST1 to ST2, and determines whether or not the command requests the minimum rotation speed. Judge. That is, the operating frequency code transferred from the indoor unit control unit 11 is
It is determined whether or not the rotation speed is the minimum.

For example, since the operation was initially started,
If the operation frequency code is a somewhat large value (that is, a value higher than the minimum rotation speed), the process proceeds from step ST2 to ST3 to determine whether or not there is a stop request. If the stop request has not been issued, the compressor 4 is operated as usual (step ST4), that is, the rotation of the compressor 4 is controlled in accordance with the operation frequency code from the indoor unit controller 11, and the stop request is issued due to some abnormality. Is issued, the compressor 4 is stopped (step ST5). In addition, even if it returns to normal operation, if there is a request for the minimum rotation speed again, the above-described processing is executed.

Subsequently, when a request for the minimum number of revolutions is issued from the indoor unit control section 11 because, for example, the indoor temperature has reached a set value, the process proceeds from step ST2 to ST6, the timer A is started, and the compressor 4 is started. Operation is performed at a predetermined rotation speed (for example, a value lower than the current rotation speed and higher than the minimum rotation speed (13 rps)) (step ST7).

Subsequently, it is determined whether or not the timer A has timed out (step ST8), and it is determined whether or not there is a request for the minimum rotation speed from the indoor unit control section 11 until the timer A has timed out. (Step ST9). Compressor 4
If there is a request for the minimum number of revolutions even though the number of revolutions has been lowered, the process returns to step ST8. If there is no request for the minimum number of revolutions from the indoor unit control unit 11 before the timer A times out, the process returns to step ST3 and executes the above-described processing (step ST4 or ST5). That is,
This is because it is necessary to return to the normal operation because the indoor temperature has deviated from the set value by setting the compressor 4 to the predetermined rotation speed. In addition, even if it returns to normal operation, if there is a request for the minimum rotation speed again, the above-described processing is executed.

Subsequently, when the timer A times out,
The process proceeds from step ST8 to ST10, starts the timer B, and increases the minimum rotation speed of the compressor 4 to a higher value (13 rps).
Set to. Subsequently, it is determined whether or not the timer B has timed out (step ST12), and it is determined whether or not there is a request for the minimum rotation speed from the indoor unit control unit 11 before the timer B has timed out (step ST13). ). Compressor 4
If there is a request for the minimum number of rotations even though the number of rotations has been lowered, the process returns to step ST12.

If there is no request for the minimum number of revolutions from the indoor control section 11 before the timer B times out, the process returns to step ST3 and executes the above-described processing (step ST3).
4 or ST5). That is, as described above, the compressor 4
Is set to the predetermined number of revolutions, the room temperature deviates from the set value, and it is necessary to return to normal operation.
In addition, even if it returns to normal operation, if there is a request for the minimum rotation speed again, the above-described processing is executed.

Subsequently, when the timer B times out,
The input current of the outdoor unit is detected, and it is determined whether or not this input current is less than a first predetermined value (step ST14).
Note that the first predetermined value is a current value (normal current value) when the load is not heavy. For example, when the load on the compressor 4 is heavy and the input current is not less than the first predetermined value, that is, when the input current is larger than usual, it is determined whether or not there is a request for the minimum rotation speed (step ST15). . If the compressor 4 is operated at a higher minimum rotation speed for a predetermined time until the timer B times out, that is, the compressor 4 is operated at a higher minimum rotation speed, the compressor 4 is operated at a higher minimum rotation speed. Continue operation with If there is no request for the minimum number of revolutions, the process returns to step ST3 and executes the above-described processing (step ST4 or ST5). Even if the operation returns to the normal operation, if there is a request for the minimum rotation speed again, the above-described processing is executed.

When the input current becomes less than the first predetermined value, the timer C is started (step ST16), and the minimum rotation speed of the compressor 4 is set to a lower value (9 rps) (step ST17). That is, since the input current is reduced and becomes about the same as the normal state, even if the minimum rotation speed of the compressor 4 is further reduced, the vibration of the compressor 4 does not increase, and hence the piping is not damaged, and This is because the safety of the harmony machine is ensured and the control of the compressor is not adversely affected.

Subsequently, it is determined whether or not the timer C has timed out (step ST12), and it is determined whether or not there is a request for the minimum rotational speed before the timer C has timed out (step ST19). If there is a request for the minimum rotational speed despite the fact that the rotational speed of the compressor 4 has been lowered, step ST
Return to 18. If there is no request for the minimum number of revolutions before the timer C times out, the process returns to step ST3 and executes the above-described processing (step ST4 or ST5). That is, as described above, since the indoor temperature has deviated from the set value by setting the compressor 4 to the predetermined rotation speed, it is necessary to return to the normal operation. In addition, even if it returns to normal operation, if there is a request for the minimum rotation speed again, the above-described processing is executed.

Subsequently, when the timer C times out,
The input current of the outdoor unit is detected, and it is determined whether the input current is equal to or more than a second predetermined value (step ST20).
Note that the second predetermined value is a value larger than the first predetermined value. That is, chattering is easily performed in the control. For example, when the load on the compressor 4 does not become heavy and the input current is not more than the second predetermined value, it is determined whether or not there is a request for the minimum rotation speed (step ST21). As a result of operating the compressor 4 at a lower minimum rotation speed for the time until the timer C times out, that is, for a predetermined time, if there is a request for the minimum rotation speed, the compressor 4 is kept at the lower minimum rotation speed. Continue driving. If there is no request for the minimum number of revolutions, the process returns to step ST3 and executes the above-described processing (step ST4 or ST5). When returning to the normal operation, the above-described processing is executed if there is a request for the minimum rotation speed again.

When the input current is equal to or greater than the second predetermined value, the process returns from step ST20 to ST10, and repeats the above-described processing. That is, it is determined that the load on the compressor 4 has become heavy, and the minimum rotation speed is increased. Variable and set the value. That is, if the compressor 4 is operated at a lower minimum rotation speed, the vibration of the compressor 4 increases, which eventually causes damage to the piping.

As described above, when the input current is equal to or higher than the predetermined value, the minimum rotation speed is set to a higher value, and when the input current is lower than the predetermined value, the higher value is set to a higher value. 4 can be varied and set according to the load weight of the compressor 4. Even if the minimum rotation speed is lower than the conventional one especially when the load is light, the vibration of the compressor 4 does not increase ( Torque fluctuation does not increase), there is no damage to the piping, and there is no adverse effect on the control of the compressor 4, and furthermore, since the minimum number of revolutions is reduced, subtle room temperature adjustment is possible, and the comfort is improved. I can do it. The predetermined values may be the same, but are preferably set to the first and second predetermined values as described in the previous embodiment.

After the compressor 4 is operated at a predetermined rotation speed, the input current to the outdoor unit is detected, and the minimum rotation speed is varied and set according to the input current. For example, when the compressor 4 is operating near the minimum rotation speed, there is a high possibility that the indoor unit control unit 11 issues a command for the minimum rotation speed. Therefore, by detecting the input current in advance and varying and setting the minimum rotation speed in accordance with the input current, the compressor 4 is quickly operated at the minimum rotation speed in response to the minimum rotation speed command from the outdoor unit control unit 11. The compressor 4 can be operated, and the vibration of the compressor 4 does not increase (the torque fluctuation does not increase), the piping is not damaged, and the control of the compressor 4 is not adversely affected.

When the compressor is operated at the minimum rotation speed, the compressor is once operated at a predetermined rotation speed (rotation speed higher than 13 rps), an input current to the outdoor unit is detected, and the minimum rotation speed is varied according to the input current. , Set. When the compressor 4 is operated at the minimum rotation speed, the compressor 4 is operated at a predetermined rotation speed (rotation speed higher than 13 rps) for a predetermined time, and then the input current to the outdoor unit is detected. The number is variable and set.

For example, after the indoor unit controller 11 issues a command for the minimum number of revolutions, the indoor temperature suddenly changes, so there is a high possibility that the indoor unit controller 11 issues a command for the predetermined number of revolutions. After the minimum speed command is issued,
Even if the rotational speed command is changed, the indoor temperature can be quickly brought close to the set value, and the deterioration of the indoor environment can be reduced, while the compressor 4 can be quickly controlled from the predetermined rotational speed to the minimum rotational speed. As described above, vibration of the compressor 4 does not increase (torque fluctuation does not increase) as described above, there is no damage to piping, and there is no adverse effect on control of the compressor 4.

When the compressor 4 is operated at the minimum rotation speed, the compressor 4 is operated at a predetermined rotation speed (rotation speed higher than 13 rps) for a predetermined time, and then the input current to the outdoor unit is detected. If the input current is less than a predetermined value (first setting value), the motor is driven to a lower minimum rotation speed (9 rps). You are driving with settings. Therefore, the minimum rotation speed of the compressor 4 is variably set to a higher value (13 rps) or a lower value (9 rps) in accordance with the magnitude of the input current, that is, the weight of the load on the compressor 4. Therefore, as described above, the vibration of the compressor 4 does not increase (torque fluctuation does not increase), the piping is not damaged, and the control of the compressor 4 is not adversely affected.

After operating the compressor 4 at a higher minimum rotation speed for a predetermined time, an input current to the outdoor unit is detected, and if the input current is less than a predetermined value (first set value), the input current is set lower. Operating at the minimum speed of Therefore,
When the input current decreases and returns to the normal value after the minimum rotation speed is set to 13 rps (that is, when the load on the compressor 4 becomes heavy), the minimum rotation speed becomes 9 rps. On the other hand, while maintaining the pressure at a value, comfort can be achieved, but as described above, vibration of the compressor 4 does not increase (torque fluctuation does not increase), there is no damage to piping, and
There is no adverse effect on the control of the vehicle.

Further, after operating the compressor 4 at a lower minimum rotation speed for a predetermined time, the input current to the outdoor unit is detected,
When the input current is equal to or more than a predetermined value (second set value;> first set value), the operation is performed with the higher minimum rotation speed set again. Therefore, after the minimum rotation speed is set to 9 rps, when the input current increases and becomes larger than the normal value (that is, when the load on the compressor 4 becomes heavy), the minimum rotation speed becomes 13 rps. Thus, the vibration of the compressor 4 does not increase (torque fluctuation does not increase), there is no damage to the piping, and there is no adverse effect on the control of the compressor 4.

When the indoor unit issues a rotational speed command other than the minimum rotational speed while operating at the minimum rotational speed (lower value or higher value), the operation is temporarily performed by the rotational speed command (ie, Returning to the normal operation), if there is a command (request) for the minimum rotation speed again, the above-described procedure is performed to
At minimum speed (lower or higher). Therefore, during the operation of the air conditioner,
Every time there is a request for the minimum rotation speed, the minimum rotation speed can be varied and set according to the magnitude of the input current to the outdoor unit (the weight of the load on the compressor 4).

FIG. 4 is a schematic block diagram of a control device of a brushless motor for explaining a modified embodiment of the present invention. In the figure, the same parts as those in FIG.

Referring to FIG. 4, an outdoor unit control unit 12 of a control device to which the brushless motor control method of the present invention is applied.
Means for setting an input current to the outdoor unit (that is, a value corresponding to power consumption of the outdoor unit) in addition to the function of the outdoor unit control unit 5 shown in FIG. A control circuit 12b having a timer section 12a including a timer D and a timer E used for changing and setting the rotation speed to a higher value (for example, 13 rps) and a lower value (for example, 9 rps) is used. .

The operation of the control method according to this embodiment is shown in the flow chart of FIG. 5, and FIG. 5 shows steps ST6 to ST10 shown in FIG.
2 and 3 except for the above. That is, step ST30 is in ST1, step ST31 is in ST2,
Step ST32 is ST3, step ST33 is ST
4, step ST34 proceeds to ST5, and step ST35 proceeds.
To ST10, step ST36 to ST11, step ST37 to ST12, and step ST38 to ST13.
Step ST39 is followed by step ST14 and step ST40.
Is ST15, step ST41 is ST16, step ST42 is ST17, step ST43 is ST18.
In step ST44, the process proceeds to step ST19, and in step ST45.
Corresponds to ST20, and step ST46 corresponds to ST21. Further, the timer D corresponds to the timer B, the timer E corresponds to the timer C, the third set value corresponds to the first set value, and the fourth set value corresponds to the second set value.

In this embodiment, when the minimum rotation speed command is issued from the indoor unit control unit 11, the control circuit 12b of the outdoor unit control unit 12 does not operate the compressor 4 at the predetermined rotation speed for a predetermined period of time. Machine 4 is immediately raised to a higher minimum speed (13r
ps), and executes the same processing as the previous embodiment as shown in the flowchart of FIG. Therefore, for the operation of this embodiment, refer to the description of the previous embodiment.

As described above, when there is a request for the minimum rotational speed, the compressor 4 is immediately set to the higher minimum rotational speed (13 rps). When a microcomputer is used to control the outdoor unit, the number of timers is one less than in the previous embodiment.
It is obvious that the software program can be simplified because the number of the memory devices can be reduced, the memory capacity can be reduced, and the same effect as that of the previous embodiment can be obtained.

In the above-described two embodiments, two predetermined values (first and second predetermined values or third and fourth predetermined values) are prepared. Of the compressor 4 depending on which of the plurality of zones the input current to the outdoor unit enters.
May be variably set. In the above-described two embodiments, the minimum rotation speed is set to a higher value (13 rps) and a lower value (9 rps).
Although two types of s) are prepared, the outside air temperature may be divided into a plurality of zones, and the minimum rotation speed may be set for each zone. By doing so, the minimum rotation speed can be varied,
Setting control can be performed more finely.

[0051]

As described above, according to the first aspect of the control method of the air conditioner, when the input current is equal to or more than a predetermined value, the minimum rotation speed is set to a higher value and the input current is set to a predetermined value. If it is less than the value, it is set to a higher value, that is, the minimum number of revolutions can be changed according to the weight of the load on the compressor. 4 does not increase (torque fluctuation does not increase), there is no damage to the piping, and the compressor 4
There is an effect that the room temperature can be finely adjusted by lowering the minimum number of revolutions without adversely affecting the control of the vehicle, and the comfort can be improved.

According to the second aspect of the present invention, when the compressor of the air conditioner is operating at a predetermined rotation speed, the input current to the outdoor unit of the air conditioner is detected, and according to the input current, Since the minimum rotation speed of the compressor is variable and set, for example, when the compressor is operated near the minimum rotation speed, there is a high possibility that the minimum rotation speed command is issued from the indoor unit, By detecting the input current in advance and varying and setting the minimum rotation speed according to the input current, the compressor can be quickly operated at the minimum rotation speed in response to the minimum rotation speed command from the indoor unit, Moreover, as described above, the vibration of the compressor does not increase (torque fluctuation does not increase),
There is an effect that there is no breakage of the piping and there is no adverse effect on the control of the compressor.

According to the third aspect of the invention, when the compressor of the air conditioner is operated at the minimum rotation speed, the compressor is operated at a predetermined rotation speed and the input current to the outdoor unit of the air conditioner is detected. Since the minimum rotation speed of the compressor is varied and set according to the input current, for example, even if the minimum rotation speed command is issued and then the rotation speed command changes, the rotation speed of the compressor is changed. Is higher than the minimum rotation speed, the indoor temperature can quickly approach the set value, and the deterioration of the indoor environment can be reduced, while the compressor can be quickly controlled from the predetermined rotation speed to the minimum rotation speed. In addition, as described above, there is an effect that the vibration of the compressor does not increase (the torque fluctuation does not increase), the piping is not damaged, and the control of the compressor is not adversely affected.

According to the fourth aspect of the present invention, when the compressor of the air conditioner is operated at the minimum rotation speed, the compressor is operated at the predetermined rotation speed for a predetermined time, and then the input to the outdoor unit of the air conditioner is performed. Since the current is detected and the minimum rotation speed of the compressor is varied and set according to the input current, for example, after the minimum rotation speed command is issued, the rotation speed command is issued for a predetermined time. Even if it changes, since the current rotational speed of the compressor is higher than the minimum rotational speed, the indoor temperature can be quickly approached to the set value, and the deterioration of the indoor environment can be reduced. The speed can be quickly controlled to the minimum number of revolutions, and the vibration of the compressor 4 does not increase (torque fluctuation does not increase) as described above, and there is no damage to the piping.
Further, there is an effect that the control of the compressor 4 is not adversely affected.

According to the fifth aspect of the invention, when the compressor of the air conditioner is operated at the minimum rotation speed, the compressor is operated at the predetermined rotation speed for a predetermined time, and then the input current to the outdoor unit of the air conditioner is detected. When the input current is equal to or more than a predetermined value, the minimum rotation speed is changed and set higher, and when the input current is less than a predetermined value, the minimum rotation speed is changed and set lower, so that Depending on the magnitude of the input current, that is, the weight of the load on the compressor 4, the minimum rotation speed of the compressor 4 can be variably set to two values, a higher value (13 rps) and a lower value (9 rps). As described above, as described above, there is an effect that the vibration of the compressor 4 does not increase (torque fluctuation does not increase), the piping is not damaged, and the control of the compressor 4 is not adversely affected.

According to the sixth aspect of the present invention, when the compressor is operated at a higher minimum rotation speed for a predetermined time or more in the fifth aspect, an input current to the outdoor unit is detected,
When the input current is equal to or less than the first predetermined value, the compressor is varied and set to a lower minimum rotation speed. Therefore, after the minimum rotation speed is set to 13 rps, the input current decreases and the normal value is set. (That is, when the load on the compressor becomes heavy), the minimum rotation speed becomes 9 rps, so that the room temperature can be maintained at the set value and the comfort can be achieved. Vibration does not increase (torque fluctuation does not increase), there is no breakage of piping, and there is no adverse effect on control of the compressor. In addition, chattering does not occur in the control, and there is an effect that stable control can be performed. is there.

According to the seventh aspect of the present invention, when the compressor is operated at a lower minimum rotational speed for a predetermined time or more in the fifth aspect, an input current to the outdoor unit is detected,
When the input current is equal to or more than the second predetermined value, the compressor is varied and set to a higher minimum rotation speed. Therefore, after the minimum rotation speed is set to 9 rps, the input current increases and becomes higher than the normal value. When it becomes large (that is, when the load on the compressor becomes heavy), the minimum rotation speed becomes 13 rps. Therefore, as described above, the vibration of the compressor does not increase (the torque fluctuation does not increase), and the piping is damaged. There is no effect on the control of the compressor, and there is no chattering in the control and stable control can be performed.

According to the eighth aspect of the present invention, when the compressor of the air conditioner is operated at the minimum rotation speed, the compressor is operated at the higher minimum rotation speed for a predetermined time, and then the outdoor unit of the air conditioner is operated. Is detected, and when the input current is less than the third predetermined value, the minimum rotation speed is varied and set to a lower value. Immediately increase the minimum rotation speed (13 rps),
Thereafter, since the minimum rotation speed can be set lower according to the magnitude of the input current, the control of the indoor temperature can be performed quickly, and the microcomputer is used as a control means of the outdoor unit. Since the number of timers is one less than the term, the software program can be simplified (reduced memory capacity), and the cost can be reduced. Further, the same effect as the above-described claim can be obtained. It is clear.

According to the ninth aspect of the present invention, after the compressor is operated at a lower minimum rotation speed for a predetermined time or more in the eighth aspect, an input current to the outdoor unit is detected, and the input current becomes the fourth current. The compressor is variably set to a higher minimum rotation speed when the predetermined rotation speed exceeds a predetermined value. Therefore, in addition to the effect of the invention of claim 8, when the minimum rotation speed is required, the input current increases. Even if the load increases,
The compressor can be operated at a higher minimum speed.

According to the tenth aspect, the eighth aspect is provided.
Or, after operating the compressor at a higher minimum rotation speed for a predetermined time or more at 9, an input current to the outdoor unit is detected, and if the input current is not higher than a fourth predetermined value, the compressor is lowered to a lower minimum value. Since the rotation speed is variable and can be set, in addition to the effect of claim 8 or 9, when the minimum rotation speed is required, if the input current decreases (that is, if the load becomes lighter), the compressor rotates the lower minimum rotation speed. You can drive in numbers.

According to the eleventh aspect of the present invention, when the compressor is operated at the lowest rotational speed in the fifth, sixth, seventh, eighth, ninth or tenth, an instruction other than the minimum rotational speed is met. In this case, the compressor is operated in accordance with the instruction, and when the minimum rotation speed is again instructed during the operation, the compressor is operated after performing the above-described procedure. In addition to the effects of 6, 7, 8, 9 or 10, while the air conditioner is in operation, the magnitude of the input current to the outdoor unit (the load of The weight can be varied and set according to the minimum rotation speed.

According to the twelfth aspect, according to the first aspect,
In claim 1, the minimum rotation speed of the compressor is varied and set according to which of the plurality of zones the input current to the outdoor unit enters. There is an effect that variable and setting control of the number can be performed more finely.

[Brief description of the drawings]

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

FIG. 2 is a schematic flowchart illustrating the operation of the control device shown in FIG. 1;

FIG. 3 is a schematic flowchart illustrating the operation of the control device shown in FIG. 1;

FIG. 4 is a schematic block diagram of a control device of an air conditioner showing a modified embodiment of the present invention.

FIG. 5 is a schematic flowchart for explaining the operation of the control device shown in FIG. 4;

FIG. 6 is a schematic block diagram of a control device for a conventional air conditioner.

[Explanation of symbols]

 1,11 Indoor unit control unit 4 Compressor 5,10,12 Outdoor unit control unit 10a Timer unit (timer A, timer B, timer C) 10b, 12b Control circuit 12a Timer unit (timer D, timer E)

Claims (12)

[Claims] 1. A method for controlling an air conditioner in which at least a compressor constituting a refrigeration cycle is inverter-controlled to adjust a room temperature to maintain a room at a set temperature, wherein an input current to an outdoor unit of the air conditioner is detected. A method for controlling an air conditioner, wherein a minimum rotation speed of the compressor is varied and set according to the input current. 2. A method for controlling an air conditioner in which at least a compressor constituting a refrigeration cycle is controlled by an inverter to adjust a room temperature and maintain a room at a set temperature, wherein the compressor is operated at a predetermined rotation speed. A control method of an air conditioner, wherein an input current to an outdoor unit of the air conditioner is detected, and a minimum rotation speed of the compressor is varied and set according to the input current. 3. A method for controlling an air conditioner in which at least a compressor constituting a refrigeration cycle is controlled by an inverter to adjust a room temperature and maintain a room at a set temperature, wherein the compressor is operated at a minimum rotation speed. The air conditioner is operated at a predetermined rotation speed, an input current to the outdoor unit of the air conditioner is detected, and the minimum rotation speed of the compressor is varied and set according to the input current. Control method of air conditioner. 4. A method of controlling an air conditioner in which at least a compressor constituting a refrigeration cycle is controlled by an inverter to adjust a room temperature to maintain a room at a set temperature, wherein the compressor is operated at a minimum rotation speed. After operating the air conditioner at a predetermined rotation speed for a predetermined time, an input current to the outdoor unit of the air conditioner is detected, and the minimum rotation speed of the compressor is changed and set according to the input current. Characteristic air conditioner control method. 5. A method for controlling an air conditioner in which at least a compressor constituting a refrigeration cycle is controlled by an inverter to adjust a room temperature and maintain the room at a set temperature. After operating for a predetermined number of times, the input current to the outdoor unit of the air conditioner is detected, and when the input current is equal to or more than a predetermined value, the minimum rotation speed is changed and set to a higher value, and the input current is adjusted. A method for controlling an air conditioner, characterized in that when the value is less than a predetermined value, the minimum rotation speed is varied and set lower. 6. When an input current to the outdoor unit is detected while the compressor is operating at a higher minimum rotation speed for a predetermined time or more, and the input current is less than a first predetermined value, The control method for an air conditioner according to claim 5, wherein the compressor is variably set to a lower minimum rotation speed. 7. When the compressor is operated at a lower minimum rotation speed for a predetermined time or more, an input current to the outdoor unit is detected, and when the input current is equal to or more than a second predetermined value, 6. The control method for an air conditioner according to claim 5, wherein the compressor is variably set to a higher minimum rotation speed. 8. A method for controlling an air conditioner in which at least a compressor constituting a refrigeration cycle is controlled by an inverter to adjust a room temperature and maintain a room at a set temperature, wherein the compressor is operated at a minimum rotation speed. After operating the air conditioner at a higher minimum rotation speed for a predetermined time, an input current to the outdoor unit of the air conditioner is detected, and when the input current is less than a third predetermined value, the minimum rotation speed is lowered. A method of controlling an air conditioner, wherein the value is variably set. 9. After operating the compressor at a lower minimum rotation speed for a predetermined time or more, detecting an input current to the outdoor unit,
9. The compressor according to claim 8, wherein said compressor is variably set to a higher minimum rotation speed when said input current is not less than a fourth predetermined value.
The control method of the air conditioner according to the above. 10. After operating the compressor at a higher minimum rotation speed for a predetermined time or more, detecting an input current to the outdoor unit, and lowering the compressor if the input current is not higher than a fourth predetermined value. The control method for an air conditioner according to claim 8, wherein the minimum rotation speed is variably set. 11. When the compressor is operated at the minimum rotation speed and an instruction other than the minimum rotation speed is issued, the compressor is operated according to the instruction, and the minimum rotation speed of the compressor is reduced again during the operation. The compressor is operated after performing the above-described procedure when instructed.
11. The control method for an air conditioner according to 7, 8, 9 or 10. 12. The air conditioner according to claim 11, wherein the minimum rotation speed of the compressor is varied and set according to which of the plurality of zones the input current to the outdoor unit enters. Control method.