JPH11257722A - Method of controlling air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure safety by suppressing the vibration of the compressor of an air conditioner on one side and to raise the comfortableness more by enabling delicate room temperature adjustment. SOLUTION: An outdoor machine controller 10 which has received the operation frequency code from an indoor machine controller 11 inverter-controls the compressor constituting the refrigeration cycle. If there is a command for the lowest number of revolutions, the outdoor machine controller 10 detects the interval between the position detections during one rotation at every detection of position of the rotor of the compressor, and gets the magnitude of the fluctuation during one rotation by the ratio of the maximum value of the interval between the detections of position in one rotation to the minimum value on one hand, and raises the compressor 4 for the time of a timer B and then, operates it with the lowest number of revolutions on the other when the magnitude of the fluctuation is above the first set value after operating the compressor 4 with the specified number of revolutions for the time of the timer A of a timer part 10a. After that, when the magnitude of the fluctuation is under the second set value, it puts the lowest number of revolutions to a little lower value, and operates the compressor 4. Then, when the magnitude of the fluctuation is over the third set value, it returns the lowest number of revolutions to a little higher value mentioned before, and operates the compressor 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor control technology for an outdoor unit of an air conditioner (inverter air conditioner), and more particularly, to a method of controlling an air conditioner that can optimally 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. 7, an indoor unit control section 1 of this air conditioner operates 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. While the frequency is determined, the code of the operating frequency is transferred to the outdoor unit control unit 5, and 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. In FIG. 7, devices and the like necessary for the air conditioner are omitted.

[0004] Then, a refrigerant having a predetermined temperature and pressure is obtained, and the predetermined refrigerant is circulated to an indoor heat exchanger (outdoor heat exchanger) via a four-way valve, a capillary tube, or an electronic expansion valve. Since the replacement is performed, desired cold air or hot air is blown into the room by the rotation of the indoor fan, 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 motor of the compressor 4 is a brushless motor,
Vibration of the compressor 3 (due to uneven rotation speed) adversely affects the position detection control of the rotor, and proper control may not be performed.

For this reason, the minimum number of revolutions of the compressor 4 is determined to be 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 the rotation speed of the compressor 4 becomes the minimum rotation speed, the vibration of the compressor 4 is suppressed,
There is no damage to the piping, 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.

The present invention has been made in view of the above problems, and has as its object to change and set the minimum number of revolutions of a compressor according to the magnitude of fluctuation during one revolution of the compressor.
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]

In order to achieve the above object, the present invention detects at least the position of a rotor of a motor of a compressor constituting a refrigeration cycle, and based on the position detection, detects the position of the motor. In the control method of the air conditioner, which controls the compressor while controlling the compressor while controlling the room temperature and keeping the room at a set temperature while switching the energization, one rotation is divided by a timing for controlling the rotation of the motor. It is characterized in that the magnitude of the fluctuation during one rotation is detected by each divided section, and the minimum rotation speed of the compressor is variably set according to the magnitude of the fluctuation.

The method of controlling an air conditioner according to the present invention detects a maximum value and a minimum value in each section (position detection interval) during one rotation of the motor, and calculates a difference between the maximum value and the minimum value. Calculating the ratio, determining the magnitude of the fluctuation during one rotation of the motor based on the calculated ratio, and varying and setting the minimum rotation speed of the compressor according to the magnitude of the fluctuation. And

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 while each section (position detection interval) during one rotation of the motor. ), The magnitude of the fluctuation during one rotation is detected, and the minimum rotational speed of the compressor is varied and set according to the magnitude of the fluctuation.

In this case, it is preferable that after the compressor is operated at a predetermined rotation speed for a predetermined time, the minimum rotation speed of the compressor is varied and set according to the magnitude of the fluctuation. Further, when the compressor is operated at a predetermined rotation speed, if the magnitude of the fluctuation is equal to or more than a first set value, the compressor is set to a higher minimum rotation speed,
When the magnitude of the fluctuation is smaller than a second set value (> first set value), it is preferable to set a lower minimum rotation speed. Further, after operating the compressor at a higher minimum rotation speed for a predetermined time, when the magnitude of the fluctuation is less than a second predetermined value, the compressor may be variably set to a lower minimum rotation speed. Furthermore, after operating the compressor at a lower minimum rotation speed for a predetermined time, the magnitude of the fluctuation is reduced to a third predetermined value (<
When it is equal to or more than the second set value, the compressor may be variably set to a higher minimum rotation speed.

According to the present invention, at least the position of a rotor of a motor of a compressor constituting a refrigeration cycle is detected, and based on the detected position, energization of the motor is switched. In the method of controlling an air conditioner for maintaining the room at a set temperature by adjusting the air conditioner, when the compressor is operated at a minimum rotation speed, the compressor is operated at a higher minimum rotation speed for a predetermined time while the motor rotates one rotation. In each section (position detection interval), the magnitude of the fluctuation during one rotation is detected, and when the magnitude of the fluctuation is less than a fourth predetermined value, the compressor is operated at a higher minimum rotation speed for a predetermined time. After that, the minimum rotation speed is varied and set to a lower value.

In this case, after the compressor has been operated for a predetermined time at a lower minimum rotation speed, if the magnitude of the fluctuation is equal to or greater than a fifth predetermined value (<fourth set value), the compressor is increased. It is good to be variable and set to the minimum rotation speed. Further, after the compressor is operated at a higher minimum rotation speed for a predetermined time, if the magnitude of the fluctuation is less than a fourth predetermined value, the compressor may be variably set to a lower minimum rotation speed.

In the above invention, when an instruction other than the minimum rotation speed is issued when the compressor is operating at the minimum rotation speed, the compressor is operated in accordance with the instruction, and the minimum rotation speed is restarted during the operation. When the number is indicated, it is preferable to operate the compressor after performing the above-described procedure. Further, it is preferable that the minimum number of revolutions of the compressor is changed and set depending on which of the plurality of zones the magnitude of the fluctuation falls in.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the drawing, the same parts as those in FIG. 7 are denoted by the same reference numerals, and the duplicate description will be omitted. The control method of the air conditioner of the present invention focuses on the fact that the load state can be determined based on the size of the position detection interval during one rotation of the compressor.
The magnitude of the fluctuation during one rotation is detected in each of the two sections (12 steps), and the minimum rotation speed of the compressor is set higher or lower according to the magnitude of the fluctuation.

Therefore, as shown in FIG. 1, an outdoor unit control unit 10 to which the air conditioner control method of the present invention is applied.
Is the compressor 4 in addition to the function of the outdoor unit controller 5 shown in FIG.
Means for detecting the position detection interval of the rotor of the motor (the position detection interval during one rotation; storing 12 sections), and detecting the magnitude of the fluctuation during one rotation according to the time of each section; The minimum rotation speed is set to a higher value (for example, 1
3b), a control circuit (microcomputer) 10b having means for variably setting a lower value (for example, 9 rps) and timer units 10a of timers A, B, and C used for higher or lower variable and setting. And The indoor unit control unit 11 has the same function as the indoor unit control unit 1 shown in FIG.

The magnitude of the variation is, for example, the maximum value Tmax and the minimum value Tmin of the position interval section during one rotation.
Calculate by the ratio with In addition, the obtained ratio and the first to third
(The second set value <the first set value, the third set value) to set the minimum rotation speed higher or lower.

Next, the control method of the air conditioner of the present invention will be described with reference to the flowcharts of FIGS. 2, 3 and 4. First, it is assumed that the air conditioner has been operated.
Then, similarly to the related art, the indoor unit control unit 11 controls the rotation of the indoor fan according to the operation of the remote controller 2, for example, and sends a command (operating frequency code or the like) according to the set temperature and the room temperature to the outdoor unit control unit 10. Forward. Outdoor unit control unit 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 normally (step ST4), that is, the rotation of the compressor 4 is controlled in accordance with the operating frequency code from the indoor unit control 11, and the compressor 4 is stopped due to any abnormality. If the request has been issued, the compressor 4 is stopped (step ST5). In addition, even if it returns to normal operation, if there is no request of 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 controller 11 because, for example, the indoor temperature has reached a set value, the process proceeds from step ST2 to ST6, where the timer A is started and the compressor 4 is turned on. A predetermined rotation speed (for example, a value (1 lower than the current rotation speed and higher than the minimum rotation speed (13 rps))
5, 16 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 unit 11 until the timer A has timed out. (Step ST9). If there is a request for the minimum rotation speed even though the rotation speed of the compressor 4 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, since the indoor temperature deviates 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 A times out,
Proceeding from step ST8 to ST10, it is determined whether or not the magnitude of the fluctuation during one rotation of the compressor 4 is less than a first set value. The magnitude of this variation is calculated in the routine shown in FIG. 4, and the first set value is empirically obtained.

Here, the routine shown in FIG. 4 will be described. In order to control the rotation of the compressor 4, the position of the rotor of the motor is detected, and this routine is executed at each position detection timing. The motor of the compressor 4 is a three-phase four-pole motor, and one rotation is divided into 12 sections at position detection timing to form 12 sections (steps). First, the current position detection time of the rotor is set to Tnew (step ST30).
A difference (section time) T between w and the position detection time Told of the previous detection is calculated (step ST31).

Subsequently, it is determined whether or not the time T of the currently calculated section (step) is the first (0) step.
It is determined whether or not it is the first section of the two sections (step ST32). If it is the first section, the time T calculated this time is stored as T0, and the current step is determined for the subsequent determination. Increment to 1 (Step 3
3). The steps of the 12 sections are determined in advance.

Therefore, the currently calculated section (step)
If the time T of step S10 is step 10, the process proceeds from step ST34 to step ST35, where the time T calculated this time is stored as T10, and the current step is set to 11 as an increment for subsequent determination. If the time T of the currently calculated section (step) is step ST11, step S
The process proceeds from T34 to ST36, and the time T calculated this time is set to T11.
And the current step is returned to 0 for the determination of the next rotation. Further, the current position detection time Tnew is set to T
old to enable calculation of the next position detection interval time.

Subsequently, the maximum value Tmax and the minimum value Tmin are selected from the times T0 to T11 of each section during one rotation stored in the above step (step ST38), and the maximum value Tmax is changed to the minimum value Tmin. Divide by the magnitude of the fluctuation during one rotation (step ST3)
9). In this way, the magnitude of the fluctuation is calculated every time the position of the rotor is detected, and the calculated magnitude is used in the routines of FIGS. 2 and 3, that is, used to determine the load state of the compressor 4. .

Returning to FIG. 2, if the magnitude of the fluctuation actually obtained by the routine of FIG. 4 is equal to or larger than the first set value, the process proceeds from step ST10 to ST11 to start the timer B, The minimum rotation speed of the compressor 4 is set to a higher value (13 rps) (step ST12).

It is determined whether or not the timer B has timed out (step ST13), and it is determined whether or not there is a request for the minimum number of revolutions from the indoor unit control section 11 before the timer B has timed out (step ST14). . Even if the rotation speed of the compressor 4 is set to a higher minimum rotation speed, if there is a request for the minimum rotation speed, the process returns to step ST13, that is, the current condition is maintained. If there is no request for the minimum number of revolutions from the indoor unit control unit 11 before the timer B 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 deviates 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 B times out,
It is determined whether or not the magnitude of the fluctuation is less than a second predetermined value (step ST15). Note that the second predetermined value is a value smaller than the first predetermined value and larger than 1.5. For example, when the load on the compressor 4 is heavy and the magnitude of the fluctuation is not less than the second predetermined value, that is, when the magnitude of the fluctuation is larger than usual, it is determined whether or not there is a request for the minimum rotation speed. (Step ST16). In the same manner as described above, if there is a request for the minimum rotation speed even though the rotation speed of the compressor 4 is set to the higher minimum rotation speed, the process returns to step ST15, that is, the current condition is maintained. If there is no minimum speed requirement,
Returning to step ST3, the above-described processing is executed (step ST4 or ST5). In addition, even if the operation returns to the normal operation, the above-described processing is executed if there is a request for the minimum rotation speed again.

When the magnitude of the fluctuation is less than the second predetermined value, the timer C is started (step ST17), and the minimum rotation speed of the compressor 4 is set to a lower value (9 rps) (step ST18). That is, since the magnitude of the fluctuation 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 thus the pipe does not break. This is because the safety of the air conditioner 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 ST19), and it is determined whether or not there is a request for the minimum rotational speed before the timer C has timed out (step ST20). If there is a request for the minimum rotation speed even though the rotation speed of the compressor 4 is set to a lower minimum rotation speed, the process returns to step ST18, that is, the current state is maintained.
Until the timer C times out, if there is no request for the minimum rotation speed, 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. Even after returning to normal operation,
If there is a request for the minimum rotation speed again, the above-described processing is executed.

When the magnitude of the fluctuation is smaller than the first set value in step ST10, the process proceeds to step ST17, and the above-described processing, ie, the compressor 4
Lower the minimum number of revolutions. That is, even if the magnitude of the fluctuation is not large and the minimum rotation speed is set to a low value, the vibration of the compressor 4 does not increase, and the piping is not damaged, thereby ensuring the safety of the air conditioner. Also, it does not adversely affect the control of the compressor.

Subsequently, when the timer C times out,
The magnitude of the variation of the outdoor unit is detected, and it is determined whether the magnitude of the variation is equal to or greater than a third predetermined value (step ST).
21). Note that the third predetermined value is larger than the second set value, for example, larger than 1.5 and smaller than 2.
The first to third set values are determined so that chattering does not occur in the control.

For example, when the load on the compressor 4 is not heavy and the magnitude of the fluctuation is not greater than or equal to the third predetermined value, it is determined whether or not there is a request for the minimum rotational speed (step ST2).
1). 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 operated at a lower minimum rotation speed. To continue. 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). In addition, when returning to the normal operation, if there is a request for the minimum rotation speed again, the above-described processing is executed.

When the magnitude of the fluctuation is equal to or greater than the third predetermined value, the process returns from step ST21 to ST11, 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 reduced. Variable and set to a higher 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 magnitude of the fluctuation during one rotation is equal to or greater than the predetermined value (first set value), the minimum rotation speed is set to a higher value, and the magnitude of the fluctuation is set to the predetermined value (second setting value). When the load is lighter, the minimum rotation speed can be varied and set according to the magnitude of the fluctuation (that is, the weight of the load on the compressor 4). Even if the minimum number of revolutions is lower than before, 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 control of the compressor 4. In addition, since the minimum number of revolutions is low, fine adjustment of the room temperature is possible, and comfort can be improved.

When the compressor 4 operates at a predetermined rotational speed, the magnitude of the fluctuation during one rotation at that time is detected, and the minimum rotational speed is variably set according to the magnitude of the fluctuation. For example, when the compressor 4 is operating near the minimum rotation speed,
It is highly probable that the indoor unit controller 11 issues a command for the minimum number of revolutions. Therefore, the magnitude of the fluctuation during one rotation is detected for each position detection, and the minimum rotation speed is varied and set according to the magnitude of the fluctuation, whereby the minimum rotation speed command from the indoor unit control unit 11 is As a result, the compressor 4 can be quickly operated at the minimum rotation speed, and the vibration of the compressor 4 does not increase (the torque fluctuation does not increase), the piping is not damaged, and the compressor 4 is not damaged. There is no adverse effect on control.

When the compressor 4 is operated at the minimum rotation speed, the rotation speed once higher than the predetermined rotation speed (13 rps (15 rpm)
s)), the magnitude of the fluctuation is detected at that time, and the minimum rotation speed is variably set according to the magnitude of the fluctuation.
Further, when the compressor 4 is operated at the minimum rotation speed, the compressor 4 is operated at a predetermined rotation speed (a rotation speed higher than 13 rps (15 rps)) for a predetermined time, and then the magnitude of the fluctuation is detected.
The minimum rotation speed is variably set according to the magnitude of the fluctuation.

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 rotation speed command changes, 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 rotation speed to the minimum rotation 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 rotation speed once higher than the predetermined rotation speed (13 rps (15 rpm)
s)), the magnitude of the fluctuation is detected at that time, and the minimum rotation speed (9 rpm) is determined based on the magnitude of the fluctuation.
s or 13 rps). Therefore, the minimum rotation speed of the compressor 4 is set to a higher value (13 rpm) according to the magnitude of the fluctuation, that is, the load of the compressor 4.
s) or a lower value (9 rps).
Vibration does not increase (torque fluctuation does not increase),
There is no breakage of the piping and no adverse effect on the control of the compressor 4.

Further, the compressor 4 is operated at a higher minimum rotation speed for a predetermined time, at which time the magnitude of the fluctuation is detected, and the compressor 4 is operated at a lower minimum rotation speed set according to the fluctuation. Therefore, after setting the minimum rotation speed to 13 rps,
When the magnitude of the fluctuation decreases and returns to the normal value (that is, when the load on the compressor 4 becomes lighter), the minimum rotation speed becomes 9 rps, so that the indoor temperature is maintained at the set value and the comfort is maintained. On the other hand, 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.

Further, the compressor 4 is operated at a lower minimum rotation speed for a predetermined time, and at that time, the magnitude of the fluctuation is detected.
If the magnitude of this variation is equal to or greater than a predetermined value (third set value;> first set value), the operation is again performed with the higher minimum rotation speed set. Therefore, after the minimum rotation speed is set to 9 rps, when the magnitude of the fluctuation increases and becomes larger than the normal value (that is, when the load on the compressor 4 increases), the minimum rotation speed becomes 13 rps. 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.

When the compressor 4 is operating at the minimum rotation speed (lower value or higher value), if a rotation speed command other than the minimum rotation speed is issued from the indoor unit, the rotation speed command is temporarily set. (That is, normal operation), but if there is a command (request) for the minimum rotation speed again, the above-described procedure is performed to set the compressor 4 to the minimum rotation speed (lower value or higher value).
Drive with Therefore, during the operation of the air conditioner, the minimum rotation speed according to the magnitude of fluctuation during one rotation of the compressor 4 (the weight of the load on the compressor 4) every time there is a request for the minimum rotation speed. The number can be changed and set.

FIG. 5 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. 5, an outdoor unit control section 12 of a control device to which the brushless motor control method of the present invention is applied.
Is the compressor 4 in addition to the function of the outdoor unit controller 5 shown in FIG.
Means for detecting the position detection interval of the rotor of the motor (position detection interval during one rotation; time of 12 sections), comparing each section and detecting the magnitude of the variation, and the magnitude of the detected variation A higher value (for example, 13 rpm)
s), a control circuit 12b having a timer unit 12a including a timer D and a timer E used to change and set the value to a lower value (for example, 9 rps) and use the variable and setting.

The magnitude of the variation is determined, for example, by the ratio of the maximum value Tmax and the minimum value Tmin in each section during one rotation, as in the above embodiment. The minimum rotation speed is set higher or lower by comparing the fourth and fifth set values (values to be described later; fourth set value <fifth set value).

The operation of the control method in this embodiment is based on the flowchart shown in FIG. 6. FIG. 6 clearly shows steps ST6 to ST1 shown in FIG.
Except for 0, it is the same as FIG. 2 and FIG. That is, step ST40 is set to ST1, and step ST41 is set to ST2.
In step ST42, ST3, step ST43, ST4, step ST44, ST5, and step ST4.
45 to ST11, step ST46 to ST12, step ST47 to ST13, and step ST48 to ST11.
In ST14, step ST49 is in ST15, step ST50 is in ST16, and step ST51 is in ST17.
In step ST52, the process proceeds to step ST18, and in step ST53.
To ST19, step ST54 to ST20, step ST55 to ST21, and step ST56 to ST22.
It corresponds to.

Timer D corresponds to timer B, timer E corresponds to timer C, the fourth set value corresponds to the second set value, and the fifth set value corresponds to the third set value. Is also good.
Further, the magnitude of the fluctuation during one rotation is obtained by the routine shown in FIG.

In this embodiment, when a command for the minimum number of revolutions 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 number of revolutions for a predetermined time. Machine 4 is immediately raised to a higher minimum speed (13r
ps), and executes the same processing as in 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 memory cells can be reduced, the memory capacity can be reduced, and the same effect as in the previous embodiment can be obtained.

In the above-described two embodiments, predetermined values (first to third predetermined values or fourth predetermined and fifth predetermined values) are prepared. The minimum rotation speed of the compressor 4 may be set to be variable depending on which of the plurality of zones the magnitude of fluctuation during one rotation falls within. By doing so, the variable and setting control of the minimum rotation speed can be performed more finely. In the above-described two embodiments, the magnitude of the fluctuation during one rotation is obtained by the ratio between the maximum value Tmax and the minimum value Tmin of the position detection interval T, but other methods may be used. As a simple example, for example, the difference may be obtained from the difference between the maximum value Tmax and the minimum value Tmin.

[0054]

As described above, according to the first aspect of the control method of the air conditioner, one rotation is divided by the timing for controlling the rotation of the compressor motor. The magnitude of the fluctuation during one rotation is detected by the section, and the minimum rotation speed of the compressor is varied and set according to the magnitude of the fluctuation. , The minimum rotation speed is set to a higher value, and if the magnitude of the fluctuation is less than a predetermined value, the value is set to a higher value. Even if the minimum rotation speed is lower than before especially when the load is light, the vibration of the compressor does not increase (torque fluctuation does not increase), the piping is not damaged, and the compressor is not damaged. Without adversely affecting the control of Enables subtle climate by duck minimum speed becomes lower, there is an effect that can be improved comfort.

According to the second aspect of the present invention, the maximum value and the minimum value are detected among the sections (position detection intervals) during one rotation of the motor of the compressor of the air conditioner, and the maximum value and the minimum value are detected. Since the ratio with the value is calculated, the magnitude of the fluctuation during one rotation is determined based on the calculated ratio, and the minimum rotational speed of the compressor is varied and set according to the magnitude of the fluctuation. For example, when the compressor is operating near the minimum rotation speed, there is a high possibility that a command for the minimum rotation speed will be issued from the indoor unit. And the minimum rotation speed can be changed and set according to the magnitude of this fluctuation.
Since the compressor can be quickly operated at the minimum rotation speed in response to the minimum rotation speed command from the indoor unit, the vibration of the compressor does not increase (torque fluctuation does not increase) and the piping There is an effect that there is no breakage and there is no adverse effect on the control of the compressor.

According to the third 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, while each section (position detection) during one rotation of the compressor. (Interval), the magnitude of the fluctuation during one rotation is detected, and the minimum rotational speed of the compressor is varied and set according to the magnitude of the fluctuation. For example, after the minimum rotational speed command is issued, Even if the rotation speed command is changed, since the rotation speed of the compressor is higher than the minimum rotation speed, the indoor temperature can be quickly brought close to the set value, and the deterioration of the indoor environment can be reduced. Since the speed can be rapidly controlled from the rotation speed to the minimum rotation speed, the vibration of the compressor does not increase (torque fluctuation does not increase), the piping is not damaged, and the control of the compressor is adversely affected. It does not affect There is an effect.

According to a fourth aspect of the present invention, in the third aspect, after operating the compressor at a predetermined rotation speed for a predetermined time, the minimum rotation speed of the compressor is variably set according to the magnitude of the fluctuation. Therefore, for example, even if the minimum rotation speed command is issued and then the rotation speed command changes during a predetermined time, the current rotation speed of the compressor is higher than the minimum rotation speed. To the set value,
While the deterioration of the indoor environment can be reduced, the compressor can be quickly controlled from the predetermined rotation speed to the minimum rotation speed, and the vibration of the compressor does not increase (the torque fluctuation does not increase) as described above. 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 a fifth aspect of the present invention, in the third or fourth aspect, when the compressor is operated at a predetermined rotation speed, if the magnitude of the fluctuation is equal to or greater than a first set value, the minimum of When the rotation speed is set to be smaller than the second set value (> first set value), the rotation speed is set to a lower minimum rotation speed. In addition, the minimum rotational speed of the compressor is set to a higher value (13) according to the magnitude of the fluctuation, that is, the load of the compressor 4.
rps) or a lower value (9 rps), so that 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 is not adversely affected.

According to a sixth aspect of the present invention, in the fifth aspect, after the compressor has been operated at a higher minimum rotation speed for a predetermined time, if the magnitude of the fluctuation is less than a second predetermined value, the compression is reduced. Since the machine is variably set to a lower minimum rotation speed, in addition to the effect described in claim 5, when the minimum rotation speed is set to 13 rps, the magnitude of the fluctuation decreases and returns to the normal value. When the load on the compressor is not heavy, the minimum number of revolutions is 9 rps, so that the room temperature can be maintained at the set value and the comfort can be improved, but the vibration of the compressor does not increase as described above. (Torque fluctuation does not increase) and there is no damage to the piping. In addition, there is an effect that the control of the compressor is not adversely affected, chattering does not occur in the control, and stable control can be performed.

According to a seventh aspect of the present invention, in the sixth aspect, after the compressor is operated at a lower minimum rotational speed for a predetermined time, the magnitude of the fluctuation becomes a third predetermined value (<second setting). Value) or more, the compressor is variably set to a higher minimum rotation speed. In addition to the effect of the sixth embodiment, after the minimum rotation speed is set to 9 rps, the magnitude of fluctuation increases and the normal rotation speed is increased. (Ie, when the load on the compressor becomes heavy), the minimum rotation speed becomes 13 rps, so that the vibration of the compressor does not increase (the torque fluctuation does not increase) as described above. There is no damage to the piping and no adverse effect on compressor control. Moreover, there is an effect that chattering does not occur 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 period of time, while each of the compressors during one rotation of the motor is rotated. The magnitude of the fluctuation during one rotation is detected based on the section (position detection interval), and when the magnitude of the fluctuation is equal to or less than a fourth predetermined value, the compressor is operated at a higher minimum rotation speed for a predetermined time and then the same. Since the minimum rotation speed is changed and set to a lower value, when the minimum rotation speed is requested, the compressor is immediately set to a higher minimum rotation speed (13 rps), and then lowered according to the magnitude of the fluctuation. Minimum rotation speed (9 rpm
s), the control of the indoor temperature can be performed promptly, and when a microcomputer is used as the control means of the outdoor unit, the number of timers can be reduced by one as compared with the above-mentioned claim. It is obvious that the software program can be simplified (memory capacity can be reduced), and the cost can be reduced, and the same effect as the above-mentioned claims can be obtained.

According to the ninth aspect of the present invention, in the ninth aspect, after the compressor is operated at a lower minimum rotation speed for a predetermined time, the magnitude of the fluctuation is reduced to a fifth predetermined value (<fourth set value). ) If it is higher than the compressor can be changed to a higher minimum speed,
Since the setting is made, in addition to the effect of claim 8, even when the magnitude of the fluctuation becomes large (that is, the load becomes heavy) at the time of the operation at the minimum rotation speed, the compressor is operated at the higher minimum rotation speed. Can drive.

According to the invention set forth in claim 10, according to claim 8,
In the above, after operating the compressor at a higher minimum rotation speed for a predetermined time, if the magnitude of the fluctuation is less than a fourth predetermined value, the compressor is variably set to a lower minimum rotation speed. Therefore, in addition to the effect of the eighth aspect, when the magnitude of the fluctuation decreases (that is, when the load becomes lighter) during the operation at the minimum rotation speed, the compressor can be operated at a lower minimum rotation speed.

According to the eleventh aspect of the present invention, in any of the fifth, sixth, seventh, eighth, ninth and tenth aspects, when the compressor is operated at the minimum rotation speed, an instruction other than the minimum rotation speed is issued. In this case, the compressor is operated according to 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 5, 6, 7, 8, 9 or 10, while the air conditioner is operating, the magnitude of the fluctuation during one revolution every time there is a request for the minimum number of revolutions (compressor load) The weight can be varied and set according to the minimum rotation speed.

According to the twelfth aspect of the present invention, in any of the fifth, sixth, seventh, eighth, ninth, tenth and eleventh aspects, the magnitude of the variation to the outdoor unit falls into any one of a plurality of zones. As a result, the minimum rotation speed of the compressor is varied and set, so that in addition to the effect of the eleventh aspect, there is an effect that the minimum rotation speed can be varied and set more precisely.

[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 flowchart for explaining the operation of the control device shown in FIG. 1;

FIG. 5 is a schematic block diagram of a control device of an air conditioner showing a modified embodiment of the present invention.

FIG. 6 is a schematic flowchart for explaining the operation of the control device shown in FIG. 5;

FIG. 7 is a schematic block diagram of a control device of 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. At least a position of a rotor of a motor of a compressor constituting a refrigeration cycle is detected, and based on the detected position, energization of the motor is switched, and the compressor is inverter-controlled to reduce a room temperature. In the control method of an air conditioner for adjusting the temperature of the air conditioner by controlling the rotation of the motor, one rotation is divided and the magnitude of the fluctuation during one rotation is detected by each of the divided sections. A method for controlling an air conditioner, wherein the minimum rotation speed of the compressor is varied and set according to the magnitude of the fluctuation. 2. Detecting at least the position of a rotor of a motor of a compressor constituting a refrigeration cycle, and switching the energization of the motor based on the detected position, controlling the compressor with an inverter to reduce the room temperature. In a control method of an air conditioner for adjusting and maintaining a room at a set temperature, a maximum value and a minimum value are detected among respective sections (position detection intervals) during one rotation of the motor, and the maximum value and the minimum value are detected. And the magnitude of the fluctuation during one rotation of the motor is determined based on the calculated ratio, and the minimum rotational speed of the compressor is variably set according to the magnitude of the fluctuation. A method for controlling an air conditioner, comprising: 3. At least a position of a rotor of a motor of a compressor of a refrigeration cycle is detected, and based on the detected position, energization of the motor is switched. In the control method of the air conditioner, which adjusts and maintains the room at a set temperature, when the compressor is operated at a minimum rotation speed, the compressor is operated at a predetermined rotation speed, and each section during one rotation of the motor ( Control of the air conditioner, wherein the magnitude of fluctuation during one rotation is detected based on the position detection interval), and the minimum rotation speed of the compressor is varied and set according to the magnitude of the fluctuation. Method. 4. The air conditioner according to claim 3, wherein after operating the compressor at a predetermined rotation speed for a predetermined time, a minimum rotation speed of the compressor is varied and set according to the magnitude of the fluctuation. Control method. 5. When the compressor is operated at a predetermined rotation speed, if the magnitude of the fluctuation is equal to or higher than a first set value, the compressor is set to a higher minimum rotation speed, and the magnitude of the fluctuation is set to a second rotation speed. 5. The control method for an air conditioner according to claim 3, wherein when the value is less than a first set value, a lower minimum rotation speed is set. 6. 6. After operating the compressor at a higher minimum rotation speed for a predetermined time, if the magnitude of the fluctuation is less than a second predetermined value, the compressor is variably set to a lower minimum rotation speed. The method for controlling an air conditioner according to claim 5. 7. After operating the compressor at a lower minimum rotational speed for a predetermined time, when the magnitude of the fluctuation is equal to or greater than a third predetermined value (<second set value), the compressor is increased. The control method for an air conditioner according to claim 6, wherein the rotation speed is variably set. 8. At least a position of a rotor of a motor of a compressor of a refrigeration cycle is detected, and based on the detected position, energization of the motor is switched, and the compressor is controlled by an inverter to reduce a room temperature. In the control method of an air conditioner that adjusts and keeps a room at a set temperature, when the compressor is operated at a minimum rotation speed, the compressor is operated at a higher minimum rotation speed for a predetermined time, while the compressor is operated during one rotation of the motor. In each section (position detection interval), the magnitude of the variation during one rotation is detected, and when the magnitude of the variation is less than the fourth predetermined value, the compressor is operated at a higher minimum rotation speed for a predetermined time. A method of controlling an air conditioner, wherein the minimum rotation speed is variably set to a lower value. 9. After operating the compressor at a lower minimum number of revolutions for a predetermined time, if the magnitude of the fluctuation is equal to or greater than a fifth predetermined value (<fourth set value), the compressor is increased to a lower minimum value. 9. The control method for an air conditioner according to claim 8, wherein the rotation speed is variably set. 10. After operating the compressor at a higher minimum rotation speed for a predetermined time, if the magnitude of the fluctuation is less than a fourth predetermined value, the compressor is variably set to a lower minimum rotation speed. The method for controlling an air conditioner according to claim 9. 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 compressor according to claim 5, wherein the minimum rotation speed of said compressor is varied and set according to which of the plurality of zones the magnitude of said fluctuation falls in.
12. The method for controlling an air conditioner according to 9, 10, or 11.