JPH09243210A - Control method for air conditioner and apparatus therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve comfortableness by rapidly bringing the environment of the interior of a room into a comfortable one upon heating operation of ant inverter type air conditioner. SOLUTION: Outdoor heat exchange temperature is detected upon heating operation, and defrosting operation is performed when the detected outdoor heat exchange temperature is lowered to a defrosting operation value. In this case, a defrosting operation judgement part 1b of an indoor machine controller 1 outputs a defrosting operation judgement signal based upon detected temperature (indoor heat exchange temperature) by an indoor heat exchange temperature sensor 4 and the detected temperature (room temperature) by a room temperature sensor 3 in an operation frequency determination part 1a. A defrosting control judgement part 2a of an outdoor controller 2 performs defrosting control only when the defrosting operation judgement signal of the indoor machine controller 1 is outputted upon first defrosting control after initiation of the heating operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a defrosting control technique for an inverter type air conditioner, and more particularly to an air conditioner control method and device for comforting a room at the start of heating operation. .

[0002]

2. Description of the Related Art In this type of air conditioner, an outdoor unit controller drives a four-way valve, a compressor (compressor) and an outdoor fan in response to a command from an indoor unit controller, and a refrigerant obtained by the compressor is obtained. To the heat exchanger of the indoor unit.

In this case, the indoor unit controller controls the operating frequency (code of the compressor) on the outdoor unit side according to the setting of the remote controller (setting of cooling and heating, setting of strong wind and weak wind) and the difference between the indoor temperature and the set temperature. ) Is transmitted, the indoor fan is controlled to a predetermined rotation speed, and cold air or warm air that has been heat-exchanged by the heat exchanger of the indoor unit is blown into the room to maintain a comfortable environment in the room.

During the heating operation, if frost forms on the outdoor heat exchanger on the side of the outdoor unit, the heating capacity is reduced.
The outdoor unit control device detects the outdoor heat exchange temperature by the outdoor heat exchange temperature sensor (thermistor) arranged in the outlet pipe of the outdoor heat exchanger (condenser), and based on this outdoor heat exchange temperature, the outdoor heat exchanger Judging the frosted state of.

For example, when the outdoor heat exchange temperature is detected every predetermined time and the outdoor heat exchange temperature reaches the defrosting operation value, frost may be formed on the outdoor heat exchanger or frost may be formed. It is judged to be extremely high, and defrost control is started (that is, heating operation is temporarily suspended).

After that, when the outdoor heat exchange temperature reaches the defrost release value, it is determined that the outdoor heat exchanger has no frost, and the defrost control is terminated (that is, the original heating operation is performed).

[0007]

In the air conditioner control method, since the room temperature at the start of heating operation is often much lower than the value set by the remote controller, the maximum power (maximum operation Frequency) operation is continuous. That is, this is to make the room a comfortable environment as quickly as possible.

As a result, the frost formation speed of the outdoor heat exchanger is faster than during the normal heating operation, and frost formation often occurs before the outdoor heat exchange temperature reaches the defrosting operation value. The reason for this is that the relationship between the outdoor heat exchange temperature and the amount of frost formation varies depending on the conditions, and the frost formation is 100
The defrosting operation value is determined based on the outdoor heat exchange temperature at the time of becoming%, but when defrosting does not necessarily reach 100%, defrosting control is not performed, and in a slightly less frosting state. This is because the defrosting operation value is determined so as to perform defrosting control.

As described above, even if the frost condition is slightly low, that is, the temperature of the hot air blown from the indoor unit is high (because the room temperature has not reached the set value), and the heating operation can be continued, the outdoor heat exchange temperature Has reached the defrosting operation value and defrosting control is performed, so it will take time for the room temperature to reach the set value, and it will not be possible to quickly create a comfortable environment inside the room, and comfort will be greatly impaired. Become.

The present invention has been made in view of the above problems, and an object thereof is to make the conditions of the first defrosting control after the start of the heating operation strict so that the room temperature can be raised to the set value as soon as possible, that is, the room interior. An object of the present invention is to provide an air conditioner control method and an air conditioner control apparatus that promptly create a comfortable environment and improve comfort.

[0011]

In order to achieve the above object, the present invention detects an outdoor heat exchange temperature during heating operation, and defrosts when the detected outdoor heat exchange temperature drops to a defrosting operation value. In the control method of the air conditioner that performs the control, the indoor heat exchange temperature is equal to or lower than a predetermined value or the operating frequency of the compressor is equal to or lower than a predetermined value as a condition for performing the first defrosting control after the heating operation is started. It is characterized by adding things.

According to the present invention, the heating operation is started in the control device of the air conditioner for detecting the outdoor heat exchange temperature during the heating operation and performing the defrosting control when the detected outdoor heat exchange temperature decreases to the defrosting operation value. When performing the first defrosting control, the indoor unit control means for determining the defrosting operation by the indoor heat exchange temperature or the indoor temperature of the air conditioner and outputting the defrosting operation determination signal, and the indoor unit control means An outdoor unit control unit that performs the defrosting control when the defrosting operation determination signal is output is provided, and the outdoor unit control unit and the outdoor unit control unit are microcomputers.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of the present invention will be described in detail with reference to FIG. 1 and FIG. 2, as shown in FIG. And the outdoor unit control device 2.

Indoor unit control device (microcomputer)
Reference numeral 1 denotes an operating frequency determination unit 1a that determines the operating frequency (operating frequency code) of the compressor based on the room temperature (indoor temperature) detected by the room temperature sensor (thermistor) 3, and an indoor heat exchange temperature sensor (thermistor). The defrosting operation determination unit 1b that determines the defrosting operation based on the indoor heat exchange temperature and the determined operation frequency code detected by 4 is transmitted to the outdoor unit control device 2.

Outdoor unit control device (microcomputer)
2 is when performing the first defrost control after the start of heating operation,
When the outdoor heat exchange temperature detected by the outdoor heat exchange temperature sensor is equal to or lower than a predetermined value (for example, −6 ° C.) and the defrosting operation determination signal is transmitted from the indoor unit control device 1, the defrosting control determination is performed. The defrosting control determination part 2a which performs is provided.

The air conditioner has the function of the air conditioner described in the conventional example. For example, in defrost control during heating operation, the four-way valve 5 and the compressor 6 are controlled in a predetermined manner. Further, the indoor unit control device 1 and the outdoor unit control device 2 have the functions described in the conventional example. For example, the operating frequency determination unit 1a determines the operating frequency code according to the difference between the room temperature and the setting value set by the remote controller, and the indoor unit control device 1 transmits the determined operating frequency code to the outdoor unit control device 2 and the outdoor unit. The controller 2 decodes the operating frequency code and compresses the compressor 6
Drive.

Next, the control method of the air conditioner having the above structure will be described with reference to the flow chart of FIG. 2. First, for example, it is assumed that the air conditioner is heated by operating a remote controller.

At this time, the indoor unit controller 1 sends a heating operation command (a signal including an operation frequency code) to the outdoor unit controller 2.
The outdoor unit controller 2 drives the four-way valve 5, the compressor 6 and the outdoor fan according to the command.

During this heating operation, whether or not the outdoor heat exchange temperature has reached the defrosting operation value every predetermined time (for example, when the integrated value of the drive time of the compressor 6 reaches a predetermined value). If the outdoor heat exchange temperature reaches the defrosting operation value, it is determined that the defrosting control is necessary.

In the first defrosting control after the start of the heating operation, the process proceeds from step ST1 to ST2, and it is determined whether or not the outdoor heat exchange temperature is below a predetermined value (-6 ° C; defrosting operation value).

When the outdoor heat exchange temperature becomes lower than the predetermined value, the process proceeds to step ST3, and it is determined whether or not the defrosting operation determination signal is output from the defrosting control determination unit 1b of the indoor unit control device 2.

The defrosting control determination section 1b determines the defrosting operation based on the indoor heat exchange temperature and the operating frequency code transmitted to the outdoor unit control device 2. For example, if the indoor heat exchange temperature is 45 ° C. or lower, the room temperature has reached the value set by the remote control or is very close to the set value, that is, the room is already in a comfortable state, and therefore defrost It is determined that control may be performed. If the operating frequency code is set to a low value (for example, code 2), it is determined that the defrosting control may be performed because the room temperature has already reached the set value, that is, the room is in a comfortable environment. .

When the indoor unit controller 1 determines that the defrosting control is performed, a defrosting operation determination signal is transmitted to the outdoor unit controller 2. By this transmission defrosting operation determination signal, the process proceeds to step ST4, and defrosting control is performed as in the conventional case. That is, as described above, the room is already in a comfortable environment, and even if the compressor 6 is temporarily stopped, the room temperature does not drop so much, that is, the comfort is not impaired.

Next, during the heating operation after the first defrosting control, the process proceeds from step ST1 to ST5, and it is determined whether the outdoor heat exchange temperature is below a predetermined value (-6 ° C; defrosting operation value). to decide. When the outdoor heat exchange temperature falls below a specified value,
In step ST4, defrost control is performed.

When the defrosting control is performed, the outdoor heat exchange temperature is detected as described in the conventional example, and when the outdoor heat exchange temperature reaches the defrost release value, the original heating operation is resumed. Return.

As described above, prior to the first defrosting control after the start of the heating operation, the indoor heat exchange temperature is lower than the predetermined value (45 ° C.) or the operating frequency code transmitted to the outdoor unit is low. It is determined whether or not defrost control may be performed.

Therefore, the indoor environment can be promptly made to be a comfortable environment, the indoor environment is not deteriorated by the first defrosting control, and the comfort is not impaired.

Since the indoor unit control device 1 and the outdoor unit control device 2 are microcomputers, the above-mentioned functions can be realized by software. other,
The room temperature sensor 3 and the indoor heat exchange temperature sensor 4 on the indoor unit side and the outdoor heat exchange temperature sensor on the outdoor unit side (not shown) are provided in the conventional air conditioner. If these sensors are used, new hardware is added. You don't have to.

[0029]

As described above, according to the first aspect of the control method for the air conditioner and the apparatus therefor of the present invention, in addition to the normal condition, the first defrost control after the heating operation is started, Since the condition that the indoor heat exchange temperature is below a predetermined value (45 ° C) or the operating frequency code transmitted to the outdoor unit is below a predetermined value is added, the room temperature can be raised to the set value as soon as possible. That is, the indoor environment can be promptly made into a comfortable environment, and the comfort can be improved.

According to the second aspect of the present invention, the indoor unit control device (microcomputer) of the air conditioner determines the defrosting operation based on the indoor heat exchange temperature and the operating frequency code and outputs the defrosting operation determination signal. Since the outdoor unit controller (microcomputer) performs the defrosting control when the defrosting operation determination signal is output from the indoor unit controller during the first defrosting control after the heating operation is started, The effect is the same as that of No. 1, and since there is no need to add hardware, there is an effect that the cost can be reduced.

[Brief description of drawings]

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

FIG. 2 is a schematic flowchart illustrating the air conditioner shown in FIG.

[Explanation of symbols]

 1 Indoor unit control device (microcomputer) 1a Operating frequency determination part 1b Defrosting operation determination part 2 Outdoor unit control device (microcomputer) 2a Defrosting control determination part 3 Room temperature sensor (thermistor) 4 Indoor heat exchange temperature sensor (thermistor) 5 four-way valve 6 compressor

Claims (2)

[Claims] 1. A control method for an air conditioner, which detects an outdoor heat exchange temperature during heating operation and performs defrost control when the detected outdoor heat exchange temperature drops to a defrosting operation value, after starting heating operation. As a condition for performing the first defrost control, the indoor heat exchange temperature is below a predetermined value, or the operating frequency of the compressor is added below a predetermined value is added to the control method of the air conditioner. . 2. A controller for an air conditioner, which detects an outdoor heat exchange temperature during heating operation and performs defrost control when the detected outdoor heat exchange temperature drops to a defrosting operation value. When performing the first defrosting control, the indoor unit control means for determining the defrosting operation based on the indoor heat exchange temperature and the indoor temperature of the air conditioner and outputting the defrosting operation determination signal, and the defrosting operation from the indoor unit control means. An outdoor unit control means for performing the defrosting control when a frost operation determination signal is output, wherein the outdoor unit control means and the outdoor unit control means are microcomputers. apparatus.