JPH11264599A - Method for controlling air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To operate an air conditioner for heating in a comfortable state by preventing the unpleasant feel or cold air feeling resulting front the blowing sound of blown warm air. SOLUTION: An indoor machine control section 1 decides the control mode of an indoor fan 6 to set air volume control or cold air preventive control by detecting indoor heat- exchanging temperature by means of an indoor heat-exchanging temperature detecting section 1b from the detect signal of an indoor heat-exchanging temperature sensor section 4 and controls the number of revolutions of an indoor fan 6 by means of an indoor fan motor driving section 1d. When the indoor heat-exchanging temperature drops and enters the breeze zone for the cold air preventive control after the fan 6 is controlled in the set air volume control mode, the control section 1 decreases the number of revolutions of the fan 6 for the presently set air volume by a prescribed value and controls the number of revolutions of the fan 6 with a preset value. When the control number of the fan 6 returns to the set air volume control, the control, section 1 controls the fan 6 to the decreased number of revolutions. When the room temperature detected by means of a room temperature detecting section 1c front the detect signal of a room temperature sensor section 5 is lower than a prescribed value at the time of controlling the fan 6 to the decreased number of revolutions, the control section 1 decrease the number of revolutions for the presently set air volume by a prescribed value whenever the control mode of the fan 6 is switched between the set air volume control and cold air preventive control. When the room temperature is the prescribed value of higher, the control section 1 returns the number of revolutions for the current set air volume to the initial value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technology for controlling an indoor fan of an inverter air conditioner (air conditioner), and more particularly, to an air conditioner in which a problem caused by cold air prevention control is eliminated to improve comfort. It relates to a control method.

[0002]

2. Description of the Related Art In this air conditioner, a refrigeration cycle is operated in accordance with, for example, an operation by a remote controller, and a room temperature is set to a temperature set by the remote controller to make the room a comfortable environment. In the heating operation, the indoor unit controls the rotation of the indoor fan motor and blows out the hot air obtained by exchanging heat with the indoor heat exchanger at the set air volume. However, the temperature of the indoor heat exchanger (the indoor heat exchange temperature) )
Is low, especially when the operation is started, the temperature of the indoor heat exchanger is often not high. At this time, the cool air prevention control is performed.

In this cold air prevention control, for example, as shown in FIG. 3, the amount of blown air (the number of rotations of an indoor fan) is preset according to the temperature of the indoor heat exchanger (indoor heat exchange temperature). When the indoor heat exchange temperature is lower than 32 ° C. (when it is in the ultra-breeze zone), the indoor fan is rotated at the set value for setting the blown air volume to ultra-breeze, and when the indoor heat exchange temperature is 32 ° C. or more and less than 40 ° C. The indoor fan is rotated at a set value at which the amount of blown air is set to be a breeze (when in the breeze zone). When the indoor heat exchange temperature is equal to or higher than 40 ° C. (when the indoor heat exchange temperature is in the set air volume zone), the cool air prevention control is canceled and the blow air volume is set to the air volume set by the remote controller.

When the indoor heat exchange temperature drops to 35 ° C. or lower (returns to the breeze zone) due to, for example, turning off the compressor, the cool air prevention control is operated to reduce the amount of blown air to a small breeze. When the temperature further lowers to 28 ° C. or lower (returns to the ultra-breeze zone), the amount of air blown out is determined to be a super-breeze.

[0005] As described above, when the indoor heat exchange temperature is low at the start of operation, or when the indoor heat exchange temperature is low due to the operation of the compressor being turned off, the blown air volume is set to be a small wind or a super breeze so that the low hot air does not hit the user. In other words, it does not cause any discomfort and suppresses the deterioration of the indoor environment.

[0006]

In the control method of the air conditioner, for example, when the temperature set by the remote controller is low, and when the room temperature is near the set temperature, the operating frequency of the compressor is low. Therefore, since the condensing pressure is low, the indoor heat exchange temperature may enter the breeze zone from the set air volume zone. In this case, the indoor heat exchange temperature enters the breeze zone, and the cool air prevention control is started. However, the drop between the current rotation speed of the indoor fan and the rotation speed at the set airflow is large. 1
400 rpm), and the rotation speed of the breeze zone is 800 rpm
pm, the rotational speed difference is as high as 600 rpm. If the set temperature is not high, the indoor heat exchange temperature rises by the cold air prevention control, and the control is switched to the set air volume control.

As described above, when the indoor heat exchange temperature moves back and forth between the set air volume zone and the breeze zone, that is, when the cold air prevention control and the set air volume control are repeated, the rotation control of the indoor fan is greatly changed. However, when the airflow is changed from the set airflow to the breeze, the amount of hot air is suddenly reduced, which causes a problem of giving an unpleasant sensation due to a feeling of cool air.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above problems, and has as its object to prevent an uncomfortable feeling or a feeling of cold air due to a change in air blowing due to repetition of a set air volume control and a cold air prevention control. An object of the present invention is to provide an air conditioner control method capable of maintaining the performance.

[0009]

In order to achieve the above object, according to the present invention, the number of revolutions of the indoor fan is controlled by a preset value according to the temperature of the indoor heat exchanger constituting the refrigeration cycle. On the other hand, when the indoor heat exchange temperature is equal to or higher than a predetermined value, a method for controlling an air conditioner that switches the indoor fan from the cold air prevention control to the set air volume control, wherein the zone of the cold air prevention control is divided into a plurality of zones. ,
When the indoor heat exchange temperature returns to at least a zone closer to the control of the set air volume among the plurality of zones after switching from the cold air prevention control to the set air volume control, the value of the rotation speed corresponding to the currently set air volume is changed. It is characterized by having.

This invention controls the number of revolutions of the indoor fan to a preset value when the temperature of the indoor heat exchanger (indoor heat exchange temperature) constituting the refrigeration cycle is in the ultra-low wind zone or the low wind zone of the cold air prevention control. On the other hand, when the indoor heat exchange temperature is equal to or higher than a predetermined value, the air conditioner is a control method of switching the indoor fan from the cold air prevention control to the set air flow control, wherein the control is switched from the cold air prevention control to the set air flow control. After that, when the indoor heat exchange temperature returns to at least the breeze zone, the value of the rotation speed corresponding to the currently set airflow is changed, and the rotation speed of the indoor fan when returning to the set airflow control is changed. It is characteristic.

In this case, it is preferable that the value of the rotation speed corresponding to the current set air volume is changed by a predetermined value until the room temperature reaches a predetermined value or more. Further, after changing the value of the rotation speed corresponding to the currently set airflow, when the room temperature becomes equal to or higher than a predetermined value, the changed rotation speed is returned to the initial value and the room at the time of controlling the set airflow is controlled. It is preferable to make the rotation speed of the fan normal.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to FIGS. Please refer to FIG. 3 for the air volume zone for explaining the cold air prevention control.

In the control method of the air conditioner of the present invention, when the control is switched from the control of the set air volume to the cool air prevention control, if the rotation speed of the currently set air volume is changed to a predetermined reduced value, for example, the room is controlled by the cool air prevention control. When the heat exchange temperature rises and returns to the set air volume, since the rotation speed of the currently set air volume has decreased, it is difficult to switch to the cold air prevention control again, that is, the repetition of the set air volume control and the cold air prevention control is reduced, and as a result, It focuses on preventing the feeling of discomfort and cool wind from changing the ventilation.

Therefore, as shown in FIG. 1, the control device to which the air conditioner control method of the present invention is applied includes an indoor unit control unit (including a microcomputer or the like) 1 and an outdoor unit control unit 2. In addition, signals necessary for operating the air conditioner (for example, operating frequency and discharge temperature of the compressor) are exchanged between the indoor unit control unit 1 and the outdoor unit control unit 2.

The indoor unit control unit 1 receives a remote control signal from the remote control 3 by the remote control signal discriminating unit 1a to discriminate (including analysis), and detects a detection signal from the indoor heat exchange temperature sensor unit 4 for indoor heat exchange temperature detection. The temperature of the indoor heat exchanger (indoor heat exchange temperature) Tn is inputted by the unit 1b to detect the room temperature, and the detection signal from the room temperature sensor unit 5 is inputted to the room temperature detecting unit 1c to detect the room temperature. The indoor fan (motor) 6 is rotationally controlled by the indoor fan motor driving unit 1d based on the air volume, the air volume (for example, a breeze, a super breeze) according to the indoor heat exchange temperature, and the room temperature.

The indoor unit control unit 1 controls the room temperature and the remote control 3
An operating frequency code and a heating / cooling (switching of the four-way valve) instruction according to the difference from the set temperature are transmitted to the outdoor unit control unit 2, and the outdoor unit control unit 2 controls the compressor 7 according to the operation frequency code. Rotate and switch the four-way valve. In addition,
The indoor unit control unit 1 and the outdoor unit control unit 2 also perform other processes necessary for the air conditioner.

Next, a control method applied to the control device having the above-described configuration will be described with reference to a flowchart shown in FIG. 2 and an air volume zone diagram shown in FIG. I do. Then, the indoor unit control section 1 executes necessary processing according to the remote control signal from the remote control 3, that is, executes the routine shown in FIG. 2, and executes other processing necessary for the heating operation.

First, it is determined whether a condition for turning on the compressor 7 is satisfied (step ST1). For example, when the room temperature is low and it is necessary to operate the refrigeration cycle, ON control of the compressor 7 is transmitted to the outdoor unit control unit 2 (step ST2), and an operation frequency code corresponding to the room temperature and the set temperature is transmitted. The control signal is transmitted to the outdoor unit control unit 2 to drive and control the compressor 7.

Subsequently, at the start of heating, since the temperature of the indoor heat exchanger may not have risen, the number of revolutions of the indoor fan is reduced, that is, ultra-low wind (for example, number of revolutions: 600 rpm) ( Step ST3), it is determined whether or not the indoor heat exchange temperature Tn has entered the breeze zone (see FIG. 3) (step ST4).

Waiting for the indoor heat exchange temperature Tn to rise, and when the indoor heat exchange temperature Tn enters the breeze zone, the number of revolutions of the indoor fan is increased (for example, to 800 rpm), that is, to a breeze (step ST5). It is determined whether or not the indoor heat exchange temperature Tn has entered the set air volume zone (see FIG. 3) (step ST6). Thereby, a feeling of cool wind can be prevented.

Similarly, the controller waits for the indoor heat exchange temperature Tn to rise, and when the indoor heat exchange temperature Tn enters the set air volume zone, sets the number of revolutions of the indoor fan to a value corresponding to the air volume set by the remote controller 3 (step). ST7). For example, if the set air volume is a strong wind, the speed is set to 1400 rpm.
00 rpm, 1000 rpm if the set air volume is light breeze
The rotation of the indoor fan 6 is controlled so that While the control of the set air volume is executed, it is determined whether or not the indoor heat exchange temperature Tn has returned to the breeze zone (step 8), that is, the indoor heat exchange temperature Tn is monitored.

If the indoor heat exchange temperature Tn does not return to the breeze zone, that is, if the indoor heat exchange temperature Tn does not drop to 35 ° C., the cool air prevention control is not performed, and the rotation speed of the indoor fan is controlled according to the set airflow. However, for example, remote control 3
If the set temperature of the compressor 7 is low and the room temperature is near the set temperature, the operating frequency of the compressor 7 is reduced so that the room temperature does not exceed the set temperature, that is, the condensing pressure is reduced. Temperature may enter the breeze zone from the set air volume zone.

Then, the process proceeds from step ST8 to ST9, in which the rotation speed of the currently set air volume is set to a predetermined value (for example, 20 rpm).
Change to a lower value. For example, if the set airflow is strong, the speed is changed from 1400 rpm to 1380 rpm, if the set airflow is weak, the speed is changed from 1200 rpm to 1180 rpm, and if the set airflow is light, the speed is changed from 1000 rpm to 98
0 rpm, that is, the rotation speed of the currently set air volume is 20 r.
pm down. Then, after changing and setting the rotation speed of the currently set air volume, it is determined whether or not the room temperature is equal to or higher than a predetermined value (for example, 20 ° C.) (step ST10). If the room temperature is lower than 20 ° C., the process returns to step ST5, The indoor fan 6 is controlled to the rotation speed of the breeze (800 rpm), and the indoor heat exchange temperature Tn is controlled.
It is determined whether or not has entered the set air volume zone (see FIG. 3) (step ST6). That is, if the air volume is increased when the room temperature is low, a cool air feeling is given to the user.

Subsequently, the control waits for the indoor heat exchange temperature Tn to rise, and when the indoor heat exchange temperature Tn enters the set air volume zone, the number of revolutions of the indoor fan is changed to a changed value (step ST).
7) Hereinafter, the above-described processing is repeated. Therefore, as long as the room temperature does not exceed a predetermined value (20 ° C.), the rotational speed of the currently set air volume (the air volume set by the remote controller 3) decreases by 20 rpm each time the set air volume control and the cold air prevention control are repeated. For example, if the set air volume is a strong wind, 138
20 rpm from 0 rpm, 20 rpm from 1180 rpm if the set airflow is weak, and 20 980 rpm from 980 rpm if the set airflow is light.
decrease by rpm

As described above, every time the set airflow control and the cold air prevention control are repeated, the rotation speed of the set airflow is sequentially reduced, that is, the rotation speed of the set airflow is reduced to the rotation speed of the light wind zone (800 rpm).
m), the air blowing noise when switching between the set air volume control and the cold air prevention control does not give any discomfort, and it can also suppress the feeling of cool air, which in turn reduces the decrease in comfortable heating operation. Become.

On the other hand, when the room temperature is equal to or higher than 20 ° C., even if the rotation speed of the indoor fan 6 is high, a sense of cool air is not given. Put it back. For example, if the set air volume is a strong wind, it is returned to 1400 rpm, if the set air volume is a weak wind, it is returned to 1200 rpm,
Return to 000 rpm. Subsequently, in step ST5, the indoor fan 6 is controlled to the rotation speed of the breeze (800 rpm), and the indoor heat exchange temperature Tn is set to the set air volume zone (see FIG. 3).
It is determined whether the indoor heat exchange temperature Tn has risen. When the indoor heat exchange temperature Tn enters the set airflow zone, the rotation speed of the indoor fan is set to the original set airflow (step ST6). Step ST7), that is, as usual, and the above-described processing is repeated. That is, if the room temperature is high, the possibility that the indoor heat exchange temperature Tn enters the breeze zone is low, and even if the number of rotations of the indoor fan 6 is high, a cool air feeling is not given.

[0027]

As described above, according to the first aspect of the control method of the air conditioner, the rotational speed of the indoor fan is preset according to the temperature of the indoor heat exchanger constituting the refrigeration cycle. A method for controlling an air conditioner that switches the indoor fan from the cold air prevention control to the set air volume control when the indoor heat exchange temperature is equal to or higher than a predetermined value while performing the cold air prevention control with a set value. The control zone is divided into a plurality of zones, and when the indoor heat exchange temperature returns to at least a zone closer to the set airflow control of the plurality of zones after switching from the cold air prevention control to the set airflow control, it corresponds to the current set airflow. Since the value of the number of rotations to be changed is changed, the number of rotations of the currently set airflow decreases every time the set airflow control and the cold air prevention control are repeated, Since the closer to the rotational speed of the speed cold air prevention control rotation, it is possible to prevent discomfort to the blower changes due repetition of set air volume control and the cold air prevention control. Further, since the number of revolutions at the time of the set air volume control is reduced, even when the set temperature is relatively low, it is not necessary to give a feeling of cool air (that is, it is possible to prevent the feeling of cool air), thereby maintaining the comfort of the indoor environment. There is an effect that can be.

According to the second aspect of the present invention, when the temperature (indoor heat exchange temperature) of the indoor heat exchanger constituting the refrigeration cycle is in the ultra-low wind zone or the low wind zone of the cool air prevention control, the rotation speed of the indoor fan is reduced. A method for controlling an air conditioner that controls the indoor fan from the cold air prevention control to the set air volume control when the indoor heat exchange temperature is equal to or higher than a predetermined value while controlling to a preset value. When the indoor heat exchange temperature returns to at least the breeze zone after switching to the set airflow control, the value of the rotation speed corresponding to the currently set airflow is changed, and the rotation speed of the indoor fan when returning to the set airflow control is changed. Since it is changed, during the heating operation, from the set air volume control (for example, strong wind; rotation speed 1400 rpm) to the cool air prevention control (for example, the rotation speed of light wind; 800 r Current set air volume when switching to m) is a predetermined value than 1400 rpm (20 rpm) becomes low,
And 2 for each repetition of the set air volume control and the cold air prevention control.
Since the rotation speed decreases by 0 rpm, that is, the rotation speed of the currently set airflow approaches the rotation speed 800 rpm of the cold air prevention control, it is possible to prevent an unpleasant sensation to a change in air blowing due to repetition of the set airflow control and the cold air prevention control. In addition, the repetition of the set airflow control and the cold air prevention control appears remarkably when the set temperature is relatively low. However, since the rotation speed of the currently set airflow decreases, a feeling of cool air can be prevented, so that the indoor environment can be comfortably controlled. There is an effect that the property can be maintained.

According to the third aspect of the present invention, in the first or second aspect, the value of the rotation speed corresponding to the current set air volume is changed by a predetermined value until the room temperature exceeds a predetermined value. In addition to the effects of the first and second aspects, when the room temperature is not high to some extent, the set air volume control and the cold air prevention control can be repeated, so that an unpleasant feeling and a feeling of cold air can be further prevented.

According to the invention described in claim 4, according to claim 1,
After changing the value of the number of revolutions corresponding to the current set air volume in 2 or 3, when the room temperature becomes a predetermined value or more, the value of the changed number of revolutions is returned to the initial value to control the set air volume. , The rotation speed of the indoor fan is set to a normal value. In addition to the effects of claims 1, 2, and 3, if the room temperature rises to some extent, the rotation speed of the set airflow is set to the initial value (for example, 1400 rpm in the case of a strong wind setting). Even if the air volume is increased, a cool air feeling is not given even if the air volume is increased, and the original air volume (normal air volume) can be obtained. Therefore, there is an effect that the comfort of the indoor environment can be improved.

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

FIG. 3 is a schematic air volume zone schematic diagram for explaining cold air prevention control of a conventional air conditioner.

[Explanation of symbols]

 Reference Signs List 1 indoor unit control unit 1a remote control signal discriminating unit 1b indoor heat exchange temperature detection unit 1c room temperature detection unit 1d indoor fan motor drive unit 2 outdoor unit control unit 3 remote control 4 indoor heat exchange temperature sensor unit 5 room temperature sensor unit 6 indoor fan (motor 7) Compressor

Claims (4)

[Claims] 1. A method for controlling the number of rotations of an indoor fan according to a temperature of an indoor heat exchanger constituting a refrigeration cycle with a preset value to prevent cold air, and when the indoor heat exchange temperature is equal to or higher than a predetermined value, An air conditioner control method for switching an indoor fan from the cold air prevention control to the set air volume control, wherein a zone of the cold air prevention control is divided into a plurality of zones,
When the indoor heat exchange temperature returns to at least a zone closer to the control of the set air volume among the plurality of zones after switching from the cold air prevention control to the set air volume control, the value of the rotation speed corresponding to the currently set air volume is changed. A method for controlling an air conditioner, characterized in that: 2. When the temperature of the indoor heat exchanger (indoor heat exchange temperature) constituting the refrigeration cycle is in a super-breezed zone or a breeze zone of the cool air prevention control, the number of revolutions of the indoor fan is controlled to a preset value. On the other hand, when the indoor heat exchange temperature is equal to or higher than a predetermined value, a method for controlling an air conditioner that switches the indoor fan from the cold air prevention control to the set air flow control, wherein the control is switched from the cold air prevention control to the set air flow control. Later, when the indoor heat exchange temperature returns to at least the breeze zone, the value of the rotation speed corresponding to the currently set airflow is changed, and the rotation speed of the indoor fan when returning to the set airflow control is changed. Air conditioner control method. 3. The control method for an air conditioner according to claim 1, wherein the value of the rotation speed corresponding to the currently set airflow is changed by a predetermined value until the room temperature reaches a predetermined value or more. 4. After changing the value of the number of revolutions corresponding to the currently set air volume, when the room temperature becomes equal to or higher than a predetermined value, the value of the changed number of revolutions is returned to an initial value to control the set air volume. 4. The control method for an air conditioner according to claim 1, wherein the number of rotations of the indoor fan at the time is normal.