JPH06129687A - Controlling method of air conditioner - Google Patents

Abstract

PURPOSE:To make it possible to obtain a comfortable space quickly even when a temperature difference between an indoor temperature and a set temperature at the time of start of a cooling operation is small, by setting the set temperature to be low by a prescribed value when the temperature difference is the prescribed value or below. CONSTITUTION:When it is assumed, for instance, that a set temperature Ts is 25 deg.C when an indoor temperature Tr before the start of a cooling operation, i.e., an initial temperature, is 26 deg.C, a temperature difference DELTAT between them is only 1 deg.C. Even when the operation of a compressor is started at a time point t0, therefore, the operation of the compressor is stopped at a time point t1. Consequently, an operating time is short and insufficient for removing moisture in a room. Accordingly, the set temperature (25 deg.C) is subjected to minus correction by 1.5 deg. to be 23.5 deg.C by using a corrective value of the set temperature. Then the temperature difference DELTAT from the initial temperature 26 deg.C becomes 2.5 deg.C. Therefore the operating time of the compressor is prolonged from t0 to t2, the moisture in the room can be removed more and the inside of the room can be made comfortable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling an air conditioner, and more particularly to a method for controlling a compressor when the difference between the indoor temperature and the set temperature at the start of cooling operation is small.

[0002]

2. Description of the Related Art An air conditioner is equipped with an inverter device capable of steplessly controlling the operating frequency (rotational speed) of the compressor, and when the cooling operation is started, the compressor is operated until the indoor temperature approaches a preset temperature. It operates at high speed, and when the room temperature reaches the set temperature, the rotation speed of the compressor is reduced to keep the room temperature at the set temperature.However, even if the rotation speed of the compressor is reduced to the allowable minimum rotation speed, the indoor temperature is reduced. When the temperature falls below the set temperature, the compressor operation is stopped.

[0003]

By the way, the comfort during the cooling operation is not determined only by the temperature, but the humidity is greatly involved. However, in the conventional air conditioner, as described above, even if the rotation speed of the compressor is reduced to the allowable minimum rotation speed, the operation of the compressor is stopped when the room temperature falls below the set temperature. For example, if the temperature difference between the room temperature at the start of cooling operation and the set temperature is small, the time from the start of operation of the compressor to the stop of operation will be short and sufficient room moisture cannot be taken. There was a problem in terms of comfort even when the temperature dropped. Therefore, an object of the present invention is to provide a method for controlling an air conditioner that can quickly obtain a comfortable space even when the temperature difference between the indoor temperature and the set temperature at the start of the cooling operation is small.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and is an air conditioner provided with an inverter device for steplessly controlling the operating frequency of a compressor. When the temperature difference between the room temperature at the start of operation and the set temperature is less than or equal to a predetermined value, the set temperature is corrected to a lower value by a predetermined value.

[0005]

According to the above control method, when the temperature difference between the room temperature and the set temperature at the start of the cooling operation is small, the set temperature is lowered by a predetermined value, so that the operating time of the compressor becomes long,
The longer the operating time of the compressor, the more moisture can be taken in the room, so that the room can be made comfortable.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a block diagram showing an outline of a control system of an air conditioner, where 1 is an indoor unit side and 2 is an outdoor unit side. The indoor unit side 1 has an indoor control unit 3 and the outdoor unit side 2 has an outdoor control unit 4, both of which are connected by a signal line and a power line.
In addition to the signal received by the light receiving unit 5 of the remote control signal, the indoor control unit 3 receives information about the indoor temperature and humidity from the temperature sensor 6 and the humidity sensor 7, and the like. Although not shown in the figure, the indoor control section 3 stores an A / D conversion section for converting an analog input such as temperature information into a digital signal, a storage section for storing a correction value of a set temperature during cooling operation, a set temperature, and the like. And a room temperature, and a signal generation section for generating a control signal. For example, when the cooling operation is started, the operation of the indoor blower 8 is started and the signal with the outdoor control section 4 is transmitted. Start the interaction.

On the other hand, on the outdoor unit side 2, an inverter device 9 controlled by the outdoor control unit 4 and an inverter-controlled compressor
10, an outdoor blower 11, a temperature sensor 12 for detecting the outside air temperature, and the like. Although not shown in the outdoor control section 4, in addition to an A / D conversion section for converting an analog input from the temperature sensor 12 into a digital signal, A timer circuit unit, a storage unit, a comparison operation unit, a signal generation unit that generates a PWM signal necessary for inverter control, and the like are provided, and the compressor 10 is inverter-controlled. By the way, a temperature difference (Tr-Ts) between the room temperature Tr and the set temperature Ts at the start of the cooling operation as shown in FIG. 2 is stored in a storage unit (not shown) of the indoor control unit 3.
The correction values of a plurality of set temperatures Ts corresponding to the above are stored, and the temperature difference (Tr between the set temperature Ts set at the start of the cooling operation or the set temperature Ts already set at the start of the cooling operation and the indoor temperature Tr (Tr When -Ts) corresponds to any of FIG. 2, the corresponding correction value of the set temperature is selected to correct the set temperature Ts to a lower value.

For example, as shown in FIG. 3, when the room temperature Tr before the start of the cooling operation, that is, the initial temperature is 26 ° C.,
If the set temperature Ts is 25 ° C., the temperature difference ΔT
Is only 1 ° C, even if the operation of the compressor 10 is started at time t0, the operation of the compressor 10 is stopped at time t1, so that the operation time is short and it is not enough to remove the indoor humidity. is there. Therefore, if the set temperature Ts (25 ° C.) is negatively corrected by 1.5 ° C. to 23.5 ° C. using the correction value of the set temperature shown in FIG. 2, the temperature difference ΔT with the initial temperature 26 ° C. Since the temperature is 2.5 ° C., the operating time of the compressor 10 is t
Since it extends from 0 to t2, more indoor humidity can be taken.

[0009]

With the air conditioner controlled by the control method as described above, if the temperature difference between the indoor temperature and the set temperature at the start of the cooling operation is small, the set temperature is changed according to the temperature difference. Is corrected and the operating time of the compressor at the start of the cooling operation is extended, so that the dehumidifying capacity is increased and the comfort is improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing a control system of an air conditioner according to the present invention.

FIG. 2 is a sectional view of correction values of a set temperature applied to the control of the present invention.

FIG. 3 is a time chart showing an embodiment of the present invention.

[Explanation of symbols]

 1 Indoor unit side 2 Outdoor unit side 3 Indoor control unit 4 Outdoor control unit 8 Indoor blower 9 Inverter device 10 Compressor 11 Outdoor blower

Claims (2)

[Claims] 1. An air conditioner comprising an inverter device for steplessly controlling an operating frequency of a compressor, and when performing a cooling operation, a temperature difference between a room temperature at the start of operation and a set temperature is not more than a predetermined value. In this case, the control method of the air conditioner is characterized in that the set temperature is corrected to be lower by a predetermined value. 2. A plurality of correction values corresponding to a temperature difference between a room temperature and a set temperature at the start of the cooling operation are stored in a storage unit, and are selectively set in correspondence with the temperature difference. The method for controlling an air conditioner according to claim 1.