JP2004251552A - Control method for air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that the frequency of ON/OFF of a thermostat is increased, and the amenity becomes impaired, as the frequency is fixed a a specific frequency for a specific time without fail, when the operation frequency of a compressor is lowered. <P>SOLUTION: When the operation frequency of the compressor is lowered, the frequency is fixed with the specific frequency for the specific time without fail, only when the input current of the compressor is high, that is, the load of the compressor is high, whereby the frequency of ON/OFF of the thermostat is decreased within a normal use range of a small load of the compressor. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for controlling an air conditioner when the operating frequency of a compressor is reduced by inverter control.
[0002]
[Prior art]
The conventional control method of the air conditioner for reducing the compressor operating frequency is to suppress a sudden increase in the input current of the compressor when the compressor operating frequency is reduced at a predetermined frequency regardless of the input current to the compressor. The operating frequency of the compressor was reduced for a fixed period of time, or the descending speed of the compressor was slower than the ascending speed. (For example, see Patent Document 1)
[0003]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 1-237373
[Problems to be solved by the invention]
However, the conventional configuration has the following problems. Since the operating frequency of the compressor is reduced irrespective of the input current to the compressor, the operating frequency is fixed at a predetermined value even near the thermo-set temperature, and thermo-ON / OFF frequently occurs at the fixed temperature. As a result, in cooling / drying, the relative humidity rises, and in order to suppress the rise, a cooler operation than the set temperature of the remote controller is performed. There was a problem on comfort such as generation of a feeling of cool wind.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the present invention reduces the compressor operating frequency at a predetermined frequency only when the compressor input current is high, that is, only when the compressor load is large. Thus, the frequency of occurrence of the thermo-ON / OFF is suppressed, and the comfort is improved.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0007]
In FIG. 1, the compressor input current Ia detected by the input current detecting means 7 for detecting the input current of the compressor 9 is higher than the compressor input current Ib preset by the control unit 8 in the control unit. When a compressor operating frequency down command for lowering the operating frequency of the compressor 9 is transmitted from the control unit 8, the control unit 8 is preset in the range from the compressor operating frequency currently being operated to the target operating frequency according to the down command. If there is at least one frequency for fixing the compressor operating frequency for the predetermined time, the operating frequency of the compressor 8 is fixed for the predetermined time and the compressor 8 is reduced to the target operating frequency.
[0008]
【The invention's effect】
As is clear from the above embodiment, the present invention is based on the operation control means when the compressor operation frequency is reduced, and according to this configuration, the compressor is not fixed under the condition of normal use, By performing the capability variable, which is the original purpose of the inverter control, in a wide range, it is possible to provide a comfortable living environment.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a refrigeration cycle and an actuator in an air conditioner of the present invention. FIG. 2 is a flowchart of a compressor operating frequency control method of the present invention.
REFERENCE SIGNS LIST 1 indoor heat exchanger temperature sensor 2 indoor suction temperature sensor 3 indoor fan motor 4 indoor control P plate 5 outdoor heat exchanger temperature sensor 6 outdoor suction temperature sensor 7 compressor input current detecting means 8 outdoor control P plate 9 compressor 10 Valve 11 Outdoor fan motor 12 Capillary tube

Claims (1)

In an air conditioner in which the operating frequency of the compressor is variable by inverter control, the air conditioner has a compressor input current detecting means for detecting an input current of the compressor, and an input current value detected by the compressor input current detecting means is a predetermined value. When the command signal for decreasing the operating frequency of the compressor is generated when the input current value is larger than the input current value, and when the frequency decreases between the current operating frequency and the target operating frequency set by the command signal. A method for controlling an air conditioner, wherein the air conditioner has at least one frequency that is maintained for a predetermined time.

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