JPH06185795A - Controlling method of air conditioner - Google Patents

Abstract

PURPOSE:To make it possible to make stability of an indoor temperature excellent irrespective of the amplitude of an air-conditioning load of an air conditioner. CONSTITUTION:At the time when an operation of an air conditioner is started, an operation frequency of a compressor 6 is made the maximum frequency, while data on an outdoor air temperature detected by an outdoor air temperature detecting part 5 are outputted to an indoor apparatus control part 1 from an outdoor apparatus control part 2, the state of a load is determined by an air-conditioning load determining part 1a of the control part 1 on the basis of the inputted data on the outdoor air temperature, and the operation frequency for lowering an indoor temperature (room temperature: Tr) when it reaches a value being higher by a prescribed value (e.g. 1 deg.C) than a set temperature (Ts) is changed in accordance with the state of the load by a frequency changeover code 1b of the control part 1. When the outdoor air temperature is low at the time of heating, for instance, the load is determined as large and the operation frequency of the compressor for lowering the indoor temperature when it reaches Ts+1 deg.C by the start of the operation is changed over to be high. When the outdoor air temperature is high, to the contrary, the load is determined as small and the operation frequency for lowering the indoor air temperature when it reaches Ts+1 deg.C by the start of the operation is changed over to be low.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control method of an inverter type air conditioner which optimizes room temperature control at the start of operation.

[0002]

2. Description of the Related Art Conventionally, a control method for an inverter type air conditioner of this type has been such that a room temperature (room temperature; Tr) at the start of operation.
Drive at maximum power to improve the start-up of the car. That is, as shown in FIG. 3, with the operating frequency of the compressor as the maximum frequency, the room temperature control is performed so that the room temperature (Tr) quickly reaches the set temperature (Ts) of the remote controller or the like and the vicinity of the set temperature.

In the room temperature control at the time of starting the operation, for example, when the room temperature (Tr) reaches a predetermined value (for example, set temperature (Ts) + predetermined value (1 ° C.)) during heating operation, the room temperature is exceeded. To minimize chute, the compressor operating frequency is ramped down to the minimum frequency (shown in Figure 3).

After that, the room temperature is controlled as usual, and the operating frequency of the compressor is switched by a predetermined value according to the temperature difference between the room temperature (Tr) and the set temperature (Ts). Or around the set temperature).

In the room temperature control at the time of starting the above operation, when the air conditioning load is not so large, or when the air conditioning load is small, the overshoot of the room temperature can be suppressed, and even in the subsequent room temperature control,
It works effectively for room temperature stability.

Even when the air conditioning load is extremely large, for example, in the morning of midwinter, as shown in FIG.
The overshoot can be suppressed smaller. That is, the operating frequency of the compressor is set to the maximum frequency at the start of operation, and when the room temperature (Tr) reaches a value higher than the set temperature (Ts) by a predetermined value (1 ° C.), the operating frequency is decreased to the minimum frequency. Because.

[0007]

However, in the above air conditioner control method, the operation is performed when the room temperature reaches the predetermined value (set temperature (Ts) + predetermined value (1 ° C.)). Since the frequency is dropped to the minimum frequency all at once, the heating capacity is extremely reduced for an air conditioning load that is extremely large,
Along with this, the room temperature drops sharply (shown in FIG. 4). Therefore, after that, it takes time to recover the room temperature depending on the normal room temperature control, the room temperature is poor in stability, and the comfort is greatly impaired.

The present invention has been made in view of the above problems, and its object is to suppress the overshoot of the room temperature at the start of operation and to improve the stability of the room temperature thereafter, regardless of the size of the air conditioning load. An object of the present invention is to provide a control method of an air conditioner that can improve comfort.

[0009]

To achieve the above object, the present invention controls an indoor fan and an outdoor fan based on at least an indoor temperature and a set temperature, and
A method for controlling an air conditioner, which switches the operating frequency of a compressor that constitutes a refrigeration cycle, controls the compressor by an inverter, and blows cold air or warm air into the room to control the temperature in the room. At the start of the operation of the compressor, it has a judging means for detecting the outside air temperature and judging the size of the air conditioning load, and in accordance with the judgment of the air conditioning load by the judging means, the operating frequency of the compressor is set to the maximum frequency at the start of the operation. After that, the gist is that the operating frequency to be switched is changed when the room temperature reaches a predetermined value.

[0010]

Since the above method is adopted, the outside air temperature is detected at the start of operation of the air conditioner, and the magnitude of the air conditioning load is determined according to the detected outside air temperature. For example, the lower the outside air temperature during heating operation, the lower the outside air temperature. It is determined that the air conditioning load is large.

At the start of the operation, the operating frequency of the compressor is set to the maximum frequency, and when the room temperature reaches a predetermined value (a value higher than the set temperature (Ts) by a predetermined value (1 ° C.)), the operating frequency is set to the minimum frequency. The value of the frequency to be lowered is changed according to the state of the air conditioning load. For example, as the outside air temperature is lower and the air conditioning load is larger, the minimum frequency is changed to a higher value, that is, the amount of decrease in the operating frequency is decreased.

As described above, when the operating frequency is lowered to the minimum frequency, the minimum frequency is set higher, so that the room temperature does not drop sharply. Therefore, in the normal room temperature control thereafter, by changing the operating frequency of the compressor according to the difference between the room temperature and the set temperature, the room temperature can be quickly set to the set temperature (or near the set temperature). It is possible to achieve stability.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The control method for an air conditioner of the present invention is such that the operating frequency of the compressor is set to the maximum frequency (maximum power) at the start of operation.
In addition, the outside air temperature is detected to determine the state of the air conditioning load, and the indoor temperature (room temperature; Tr) reaches a predetermined value (a value higher than the set temperature (Ts) by a predetermined value (for example, 1 ° C.)). The operating frequency to be lowered sometimes is changed according to the condition of the air conditioning load. For example, as shown in Table 1 below, when the outside air temperature (To) is low during the heating operation, it is determined that the air conditioning load is large, and the room temperature is Ts when the operation starts.
Change the operating frequency of the compressor, which is lowered when it reaches + 1 ° C, to a higher value. On the other hand, when the outside air temperature (To) is high, it is determined that the air conditioning load is small, and when the room temperature reaches Ts + 1 ° C. due to the start of the operation, the operating frequency of the compressor is changed to a lower value.

[0014]

[Table 1] In the above table, a and b have a relationship of a <b, and X,
Y and Z have a relationship of X>Y> Z.

Therefore, as shown in FIG. 1, the control device for an air conditioner of the present invention comprises an indoor unit control unit 1 and an outdoor unit control unit 2, and this indoor unit control unit 1 is controlled by a remote control setting unit 3. The control signal and the detection signal from the indoor temperature detection unit 4 are input, and the outdoor unit control unit 2 inputs the detection signal from the outdoor air temperature detection unit 5. The outdoor unit controller 2 outputs the outside air temperature data to the indoor unit controller 2 based on the input detection signal, and drives the compressor 6 based on the frequency code from the indoor unit controller 2.

Further, the indoor unit control section 1 has an air conditioning load determination section 1a for determining the state of the air conditioning load based on the input outside air temperature data, and a frequency switching code determination section for determining a frequency switching code according to the determination result. 1b and.
The frequency switching code to be determined is a frequency code to drop when the indoor temperature (room temperature; Tr) reaches a predetermined value (a value (1 ° C) higher than the set temperature (Ts)) at the start of operation. is there.

The determined frequency switching code is output to the outdoor unit controller 2, and after the outdoor unit controller 2 sets the operating frequency of the compressor 6 to the maximum frequency at the start of operation, the room temperature is higher than the set temperature. The input frequency switching code is used as the minimum frequency that is lowered when it reaches a value higher by a predetermined value.

Next, the control method of the control device for the air conditioner having the above-described structure will be described in detail with reference to the graph of FIG. 2. First, the set temperature of the remote controller setting section 3 and the detected temperature of the room temperature detection 4 ( It is assumed that the indoor fan, the outdoor fan, the compressor 2 and the like are controlled based on (room temperature) and the like, for example, the heating operation is performed.

Then, at the start of the operation of the air conditioner, the operating frequency of the compressor 6 is set to the maximum frequency as in the conventional case,
The room temperature is raised (shown in Figure 2). Further, at the start of this operation, the outdoor air temperature data detected by the outdoor air temperature detection unit 5 is output from the outdoor unit control unit 2 to the indoor unit control unit 1,
The air conditioning load determination unit 1a of the indoor unit control unit 1 determines the state of the air conditioning load based on the input outside air temperature data. For example, when the outside air temperature is low, it is determined that the air conditioning load is large, and when the outside air temperature is high, it is determined that the air conditioning load is small.

The above determination result is the frequency switching code determining unit 1
It is input to b, and in this frequency switching code determination unit 1b,
The room temperature is higher than the set temperature by a predetermined value, for example, Ts + 1
The minimum frequency at which the operating frequency of the compressor 6 is lowered all at once when the temperature reaches ℃ is determined to be any of X, Y and Z (Hz) according to the A, B and C patterns in Table 1 above, and this determination is made. The frequency code is output to the outdoor unit control unit 2. When it is determined that the air conditioning load is extremely large, the higher frequency (X (Hz)
Is determined.

Then, as shown in FIG. 2, the room temperature is Ts +.
When the temperature reaches 1 ° C., the operating frequency of the compressor 6 is lowered to the frequency X higher than the minimum frequency. That is,
When the air-conditioning load is large, in the conventional example, the operating frequency drops to the minimum frequency all at once (shown by the broken line in the figure), but the operating frequency drops only to a frequency higher than the minimum frequency. (Shown by the same solid line).

Therefore, in the conventional case, the room temperature drastically drops as shown by the wavy line in FIG. 2, but in the present invention, the minimum frequency for lowering the operating frequency of the compressor 6 is increased. However, the room temperature does not drop sharply, and the room temperature is maintained at the set temperature (or near the set temperature) promptly by the normal room temperature control thereafter (shown by the solid line in FIG. 2).

As described above, when the heating operation of the air conditioner is started, the outside air temperature is detected to determine the state of the air conditioning load, and the operating frequency of the compressor 6 is set to the maximum frequency, and then the room temperature is set to a predetermined value (for example, a set temperature). When a predetermined frequency (1 ° C. higher than (Ts)) is reached, the minimum frequency to be dropped at once is changed based on the determination result, and when the outside air temperature is low and the air conditioning load is extremely large, The minimum frequency to be lowered is set to a higher frequency. Therefore, after raising the room temperature with the operating frequency of the compressor 6 as the maximum frequency, the minimum frequency at which the operating frequency is dropped all together is changed according to the size of the air conditioning load. For example, when the air conditioning load is extremely large. Since the minimum frequency to be lowered is changed to a higher value, the room temperature does not drop sharply, and the room is quickly made into a comfortable environment in the normal room temperature control thereafter, and the room temperature at the start of operation is The overshoot of can be prevented from being so large.

In the above embodiment, the heating operation is described as an example, but the stability at room temperature can be improved in the cooling operation by the same control method. in this case,
The values in Table 1 may be set to values suitable for cooling operation.

[0025]

As described above, according to the air conditioner control method of the present invention, the operating frequency of the compressor is set to the maximum frequency (maximum power) at the start of operation, and
The outside air temperature is detected to determine the state of the air conditioning load, and the temperature is lowered when the indoor temperature (room temperature; Tr) reaches a predetermined value (a predetermined value (for example, 1 ° C.) higher than the set temperature (Ts)). Since the operating frequency is changed according to the condition of the air conditioning load, the room temperature can be promptly recovered after the room temperature is raised to a predetermined value at the start of operation regardless of the size of the air conditioning load. The stability of the room temperature is quickly achieved, and even when the air conditioning load is extremely large, the room temperature is quickly recovered, and the room temperature overshoot due to the rise of the room temperature is not so large.

[Brief description of drawings]

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

FIG. 2 is a schematic graph for explaining the operation of the control device for the air conditioner shown in FIG.

FIG. 3 is a schematic graph for explaining a control method of a conventional air conditioner.

FIG. 4 is a schematic graph for explaining a control method for a conventional air conditioner.

[Explanation of symbols]

 1 Outdoor unit control unit 1a Air conditioning load determination unit 1b Frequency switching code determination unit 2 Indoor unit control unit 3 Remote control setting unit 4 Indoor temperature detection unit 5 Outdoor air temperature detection unit 6 Compressor

Claims (1)

[Claims] 1. An indoor fan and an outdoor fan are controlled based on at least an indoor temperature and a set temperature, and an operating frequency of a compressor that constitutes a refrigerating cycle is switched to perform inverter control of the compressor to cool or cool indoor air. A method for controlling an air conditioner that blows out air to control the temperature inside the room, comprising a determination means that detects the outside air temperature and determines the magnitude of the air conditioning load when the air conditioner starts operating. According to the determination of the air conditioning load by the determination means, the operating frequency to be switched when the indoor temperature reaches a predetermined value after the operating frequency of the compressor is set to the maximum frequency at the start of the operation is changed. Control method of air conditioner.