JPH06294542A - Control method of airconditioning apparatus - Google Patents

Abstract

(57) [Summary] [Purpose] Regarding operation control of an inverter type air conditioner,
An object of the present invention is to provide an operation control method for avoiding frequent repetition of ON / OFF of the compressor when the set temperature is set near the outside air temperature. An on / off detecting means for detecting on / off of a compressor and a counter for counting the number of on / off times within a predetermined time are provided in a microcomputer, and when the number of on / off times exceeds a predetermined reference value, the limit of the indoor temperature at which the compressor is stopped Is shifted by a predetermined temperature difference, and the compressor is continuously operated at the lowest applied frequency.

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 operation control of an inverter type air conditioner.

[0002]

2. Description of the Related Art Conventionally, in an inverter type air conditioner, when the room temperature approaches a set temperature, the operation frequency of the compressor is changed to continue the operation, and the cooling / heating capacity is adjusted to stabilize the room temperature. ing. However, if the set temperature is set high when the outside air temperature is low during cooling, or if the set temperature is set low when the outside air temperature is high during heating, the on / off operation of the compressor will increase and the indoor temperature will increase. In addition to widening the fluctuation range of humidity and humidity and making the user uncomfortable, a large start-up current flows due to frequent ON / OFF operations of the compressor, resulting in an increase in power consumption of the compressor.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and suppresses frequent on / off operation of the compressor when the room temperature reaches the vicinity of the set temperature, thereby suppressing the room temperature and humidity. It is an object of the present invention to provide an air conditioner control method that narrows the fluctuation range of the air conditioner and prevents an increase in power consumption due to frequent on / off operations of the compressor.

[0004]

In order to achieve the above object, the number of times the compressor is stopped is counted within a predetermined time between a set temperature and an operation stop temperature at which the compressor stops, and a preset setting is made. When the number of times exceeds the predetermined number of times, the operation stop temperature is set to be expanded by a predetermined temperature difference so that the operation of the compressor is continued at the lowest applied frequency.

[0005]

According to the above construction, the operation continuation temperature T at which the compressor continues to operate at the lowest applied frequency with respect to the preset set temperature.
When a and the compressor operation stop temperature Tb are set, the number of compressor stop operations within a predetermined time is counted when approaching the set temperature by cooling or heating operation, and when the operation stop number exceeds the predetermined number, the set temperature is set. By increasing the difference between Ts and the compressor stop temperature Tb by a predetermined temperature width T, avoiding a compressor stop and continuing the compressor at the lowest applied frequency, thereby frequently turning the compressor on and off. It is possible to avoid such problems as variation in indoor environment, user discomfort, increase in power consumption, and the like.

[0006]

Embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a block diagram showing a configuration of the present invention. DC power is supplied from an AC power supply 1 to an inverter drive circuit 3 by an AC / DC converter 2 and is switched by a signal from a microcomputer 4 to be compressed as a three-phase AC power supply. The machine 5 is being driven. Further, the compressor 5 is provided with an on / off detecting means 6 for detecting an operation or a stop by an input current or the like, the on / off of the compressor 5 is sent to the microcomputer 4, and the counter 7 counts. On the other hand, microcomputer 4
A room temperature sensor 8 for detecting an indoor temperature, a setting input means 9 for setting and inputting operating conditions of the air conditioner, the on / off detecting means 6, an operating frequency generating circuit 10, etc. are connected to the microcomputer 4, and the microcomputer 4 has a memory. 11, a calculation unit 12, a counter 7, a timer 13, a comparison unit 14 and the like are formed, and the preset temperature Ts, the operation continuation temperature Ta, the operation stop temperature Tb are set by the setting input unit 9 such as a remote controller or a device switch. , A predetermined value t, a reference value n of the number of times the compressor is stopped within the predetermined time t, a correction value T for the operation stop temperature Tb, etc.
Remembered in. The room temperature TR detected by the room temperature sensor 8 and the set temperature Ts are compared by the comparison means 14, and a predetermined applied frequency is generated by the operating frequency generation circuit 10 based on the difference and sent to the inverter drive circuit 3 to compress the compressor. 5
Control the operation of. In this state, when the operation of the compressor 5 is started and the temperature near the set temperature is reached, the operation stop of the compressor 5 is detected by the on / off detection means 6, and the number of operation stop within the time t set by the timer 13 is detected. The reference value a of the number of operation stop counted by the counter 7 and set in advance is set.
When the temperature exceeds Tb1, the calculation unit 12 adds the correction value T to the operation stop temperature Tb stored in the memory 11 to obtain the operation stop temperature Tb1.
Is set and the room temperature TR is compared with the comparison means 14,
The operating frequency generation circuit 10 generates a predetermined applied frequency and sends it to the inverter drive circuit 3.

2 and 3 are time series diagrams of the room temperature and the applied frequency of the compressor 5 showing the details of the present invention.
Is an embodiment of the cooling operation, and FIG. 3 is an embodiment of the heating operation.
Explaining with reference to FIG. 2, when the room temperature TR reaches the vicinity of the set temperature Ts, the applied frequency F of the compressor 5 decreases stepwise, and the lowest applied frequency FL for continuing the operation of the compressor 5
Temperature, the room temperature TR further decreases, and the operation stop temperature Tb
And the applied frequency F0 is reached, the operation of the compressor 5 is stopped. When the room temperature TR rises after the operation of the compressor 5 is stopped and exceeds the operation stop temperature Tb, the applied frequency F of the compressor 5 returns to the minimum applied frequency FL and the room temperature T
When R exceeds the set temperature Ts, the applied frequency F is increased stepwise from the lowest applied frequency FL to start the cooling operation. In this state, the compressor 5 is operated for a predetermined time t (30 minutes in this example), and if it exceeds the reference value a (two or more times in this example) of the number of operation stoppages during this time, the operation is stopped by the microcomputer 4. By lowering the temperature Tb by the correction value T to the operation stop temperature Tb1, the minimum temperature reached by the room temperature does not exceed the operation stop temperature Tb1, so that the operation of the compressor 5 is continued at the minimum applied power supply frequency FL. As described above, when the compressor 5 is frequently stopped near the set temperature Ts, the operation of the compressor 5 is minimized by lowering the set stop temperature Tb by a predetermined correction value T. It is possible to solve the problems such as the variation of the indoor environment, the discomfort of the user, and the increase in power consumption by continuing the application at the applied frequency FL. Similarly, in FIG. 3, when the compressor 5 is frequently shut down near the set temperature Ts during the heating operation,
By raising the set operation stop temperature Tb by a predetermined correction value T, the operation of the compressor 5 is continued in the state of the minimum applied frequency FL.

FIG. 4 is a flow chart showing the details of the present invention, in which the cooling operation or the heating operation is started (21) and the compressor 5 is started.
When the room temperature TR reaches the set temperature Ts (22), the application frequency F of the compressor 5 is gradually decreased by the microcomputer 4, and the room temperature TR is increased.
When the temperature reaches the temperature Tb at which the compressor 5 stops, the applied frequency F
The operation of the compressor 5 is stopped by setting F0 as the stop state (2
3). At the same time, set the timer 13 of the microcomputer 4 (24),
The counter 7 is set to n = 0 (25), and then the on / off detection means 6 detects whether the compressor 5 has stopped (2
6) The counter 7 counts the number of times n the compressor 5 has stopped (27), and the number of times n does not exceed the predetermined number a (two times in this example), and the timer 13 sets a predetermined time (30 times in this example). Minutes)
When it exceeds, the operation of the compressor 5 is continued as it is, and when the timer 13 does not exceed the predetermined time, the count number is advanced and repeated (28), and when n exceeds the predetermined number a, the operation stop temperature is exceeded. The operation stop temperature Tb1 is set by changing Tb by a predetermined correction value T (29), and in that state, the operation of the compressor is continued at the lowest applied frequency FL (30).

[0009]

As described above, in the present invention, when the compressor is frequently turned on and off in the vicinity of the set temperature during the cooling or heating operation, the preset temperature range is set with respect to the set temperature. The indoor temperature at which the compressor stops is expanded by a specified temperature range, and the compressor is kept operating at the lowest operating frequency to avoid frequent on / off repetitions of the compressor,
It is possible to prevent user discomfort and increase in power consumption.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of the present invention.

FIG. 2 is a time-series diagram of the indoor temperature and the applied frequency of the compressor showing the details of the present invention, showing an example of the cooling operation.

FIG. 3 is a time series diagram of an indoor temperature and a frequency applied to a compressor during a heating operation.

FIG. 4 is a flow chart showing details of the present invention.

[Explanation of symbols]

 1 AC power supply 2 AC / DC converter 3 Inverter drive circuit 4 Microcomputer 5 Compressor 6 On / off detection means 7 Counter 8 Room temperature sensor 9 Setting input means 10 Operating frequency generation circuit 11 Memory 12 Computing section 13 Timer 14 Comparison means

Claims (1)

[Claims] 1. The application frequency of the compressor is stepwise increased at a predetermined frequency ratio for every predetermined time period to start operation, and when the room temperature reaches a set temperature, the application frequency of the compressor is predetermined every predetermined time period. In the control device of the air conditioner, which gradually decreases at a frequency ratio and keeps the operation of the compressor until the compressor stops, the set temperature and the operation stop temperature at which the compressor stops The number of times the compressor is stopped for a predetermined period of time is counted, and when the preset number of times is exceeded, the same stop temperature is set by expanding the temperature difference by a predetermined temperature difference, and the compressor operation is applied at the minimum. A method for controlling an air conditioner, characterized in that the control is continued at a frequency.