JPH11173639A - Control of air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the comfortableness of an indoor environment in a control for an air conditioner. SOLUTION: An indoor machine control part 10 receives a remote control signal from a remote controller 3 to perform a control necessary for an air conditioner and transfer a necessary control signal to an outdoor machine control part 5. At this time, room temperature Tr is detected in accordance with a detecting signal from a room temperature detecting part 2. Based on the room temperature Tr and setting temperature Ts by the remote controller 3, the operating frequency code of a compressor 4 is determined by an operating frequency code instructing part 10b and transferred to the outdoor machine control part 5. The switching time interval of the operating frequency code is determined by a switching time interval determining part 10a. When the difference between the room temperature Tr and the setting temperature Ts is large, the switching time interval determining part 10a shortens the switching time interval to rapidly make the room temperature come near to the setting temperature Ts. When the difference is small, it lengthens the switching time interval to suppress the variation of the room temperature in the vicinity of the setting temperature Ts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of controlling an air conditioner of an inverter type for providing a comfortable environment in a room, and more particularly, to a case where a rapid change in room temperature is required at the time of starting operation or changing a set temperature. The present invention relates to a method for controlling an air conditioner that enables appropriate room temperature adjustment.

[0002]

2. Description of the Related Art When an operation command is issued by a remote controller or the like, this air conditioner operates a refrigeration cycle by driving a compressor or the like to maintain a comfortable environment in the room by setting the temperature of the remote controller. For example, as shown in FIG. 5, the indoor unit control unit (microcomputer, drive circuit, etc.) 1 operates the compressor 4 based on the room temperature detected by the indoor temperature detection unit 2 and the set temperature set by the remote control 3. The frequency code is determined by the operating frequency code indicating unit 1a, and the operating frequency code and the like are transmitted to the outdoor unit control unit 5, while the rotation of the indoor fan is controlled.

An outdoor unit control unit (microcomputer, drive circuit, etc.) 5 converts an operating frequency code from the indoor unit control unit 1 into an operating frequency value by an operating frequency instructing unit 5a. The compressor 4 is driven via the drive unit 5b to circulate the refrigerant to the heat exchanger on the indoor unit side, while controlling the rotation of the outdoor fan. This allows
Because the desired cold or warm air is blown into the room,
The room temperature can be adjusted, and the indoor environment can be set to a set temperature to maintain a comfortable environment.

In the above-described room temperature adjustment control, the room temperature Tr is detected at regular intervals, and based on the room temperature Tr and the set temperature Ts, that is, they are compared to determine an operation frequency code. Switch the operating frequency code. For example, in the heating operation, when the room temperature Tr is lower than the set temperature Ts, the current operation frequency code is increased by a predetermined code value every predetermined time, and when the room temperature Tr exceeds the set temperature Ts, only the predetermined code value is generated every predetermined time. Lower the current operating frequency code. Therefore, the room temperature can be maintained at the set temperature, and an indoor environment desired by the user can be provided.

[0005]

By the way, in the method of controlling the air conditioner, when the operation is started (including the operation of the compressor) or when the set temperature is changed by the remote controller 3, the room temperature is quickly brought close to the set temperature. In addition, various control methods are adopted.

For example, as shown in FIG. 6, the operating frequency code is maximized until the room temperature Tr reaches the set temperature Ts, that is, the maximum operating frequency code is continuously transferred until the room temperature Tr reaches the set temperature Ts. To switch to the minimum operating frequency code. However, the room temperature Tr is equal to the set temperature T.
Since the full-power operation is performed until s, the overshoot of the room temperature is apt to occur, and the overshoot satisfies the stop condition of the compressor 4. As a result, even though the room temperature reaches the set temperature, There is a problem that the compressor 4 stops, and the overshoot tends to be large, thereby deteriorating the indoor environment.

[0007] Further, as shown in FIG. 7, for a predetermined time (for example, 10 minutes) from the start of operation or the change of the set temperature, the switching time interval of the operation frequency code is shortened, for example, 10 minutes.
Seconds. However, the room temperature detection unit 2 uses a thermistor, and the room temperature detection by the thermistor is delayed from the actual change of the room temperature Tr, while the switching time interval (10 seconds) of the operating frequency code is too short. Cannot follow, and particularly, the room temperature Tr is equal to the set temperature T.
When it is near s, there is a problem that a slight fluctuation of the load affects, that is, a lag occurs between the change in the room temperature Tr and the switching of the operating frequency code, and the room temperature Tr hunts around the set temperature Ts.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to make it possible to quickly set a room temperature to a desired temperature, and to quickly set an indoor environment as desired without causing the above-mentioned problems. It is an object of the present invention to provide a method for controlling an air conditioner, which is capable of improving comfort.

[0009]

In order to achieve the above object, the present invention determines an operating frequency of a compressor based on at least a room temperature and a set temperature, and changes the operating frequency of the compressor at predetermined time intervals. An air conditioner that performs room temperature adjustment by switching the operation frequency is characterized in that the operation frequency switching time interval is changed according to the difference between the room temperature and the set temperature. In this case, as the difference between the room temperature and the set temperature is larger, the operation frequency switching time interval may be shorter.

[0010] The present invention determines the operating frequency of the compressor based on at least the room temperature and the set temperature,
An air conditioner for adjusting the room temperature by switching the operation frequency of the compressor at predetermined time intervals, wherein a switching time interval of the operation frequency is changed according to a change rate of the room temperature. In this case, as the change rate of the room temperature increases, the switching time interval of the operating frequency may be shortened.

It is preferable that the operating frequency switching time interval is changed for a predetermined time from the start of the operation of the air conditioner or the compressor. Further, the operating frequency switching time interval may be changed for a predetermined time from the change of the set temperature.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to FIGS. In the figure,
The same parts as those in FIG. 5 are denoted by the same reference numerals, and redundant description will be omitted. The control method of the air conditioner of the present invention can quickly bring the room temperature closer to the set temperature by shortening the switching time interval of the operating frequency of the compressor when the room temperature is apart from the set temperature, and the room temperature becomes the set temperature. Focusing on the fact that the room temperature can be stabilized near the set temperature by increasing the operating frequency switching time interval when approaching, the operating frequency switching time interval is shortened as the difference between the room temperature and the set temperature increases. The smaller the difference, the longer the operation frequency switching time interval.

Therefore, as shown in FIG. 1, the indoor unit control section 10 of the control device to which the control method of the air conditioner of the present invention is applied includes a room temperature Tr detected by the indoor temperature detecting section 2 and a set temperature by the remote controller 3. A switching time interval determining unit 10a that determines a switching time interval of the operating frequency of the compressor 4 based on a difference from the Ts, and determines and switches an operating frequency code for each time interval based on the room temperature Tr and the set temperature Ts. An operating frequency code indicating unit 10b is provided. In addition, the indoor unit control unit 10 shown in FIG.
It also has the function of

Next, the operation of the control device of the air conditioner having the above-described configuration will be described with reference to the flowchart of FIG. 2 and the time chart of FIG. It is assumed that a temperature change operation has been performed.

At this time, when the indoor unit control section 10 receives and determines a remote control signal for starting the operation or changing the set temperature, it executes the routine shown in FIG. First, the room temperature Tr is detected based on the detection signal from the room temperature detection unit 2 (step ST1), and the room temperature Tr and the set temperature T are detected.
The initial operation frequency code of the compressor 4 is determined based on the difference from s and transferred to the outdoor unit control unit 5 (step ST2). Therefore, the compressor 4 is rotated at a frequency corresponding to the initial operating frequency code.

Note that control necessary for controlling the air conditioner (such as control of an indoor fan and an outdoor fan) is also performed. The set temperature Ts is a value set by the remote controller 3 when the operation is started, and is a changed value when the set temperature is changed. The initial operating frequency code is set to a value determined in advance according to (Tr-Ts), for example, a larger value as the difference is larger.

When the operating frequency code is transferred, an internal timer (for example, a one-minute timer) is started. When the timer expires, the process proceeds from step ST3 to ST4, where the room temperature Tr is detected, and the room temperature Tr and the set temperature Ts are detected.
Then, the switching time interval of the operating frequency is calculated from the difference (step ST5). In this case, the relationship between (Tr−Ts) and the switching time interval is prepared in advance in the form of a table shown in Table 1 below. As is clear from Table 1 below, the lower the room temperature Tr with respect to the set temperature Ts, the shorter the operation frequency switching time interval.

[0018]

[Table 1]

The switching time interval of the operating frequency (Table 1)
5 to 60 seconds), the time interval is set in the internal timer and started. When the timer expires, the process proceeds from step ST6 to ST7, where the room temperature Tr is detected again and the room temperature Tr is detected again. The operating frequency code is switched according to the difference between the operating frequency code and the set temperature Ts. That is, if the room temperature Tr has not reached the set temperature Ts, the current operation frequency code is increased by a predetermined value and transferred to the outdoor unit control unit 5.

Thereafter, since the steps ST4 to ST7 are repeated, for example, in the case of the heating operation, as shown in FIG. 3, the switching time interval of the operating frequency code becomes longer as the room temperature Tr approaches the set temperature Ts.
Therefore, when the room temperature Tr is apart from the set temperature Ts, the switching of the operating frequency code is accelerated.
Since the room temperature Tr can be quickly brought close to the set temperature Ts, and the switching of the operation frequency code is delayed as the room temperature Tr approaches the set temperature Ts, the operation frequency code should be switched to the operation frequency code immediately corresponding to the actually detected room temperature Tr. The room temperature Tr is set to the set temperature Ts, and the set temperature T
Room temperature fluctuations around s can also be kept small, that is, stable maintenance can be achieved.

FIG. 4 is a block diagram for explaining another embodiment of the present invention. In the figure, the same parts as those in FIG. The control method of an air conditioner according to the present invention can quickly bring the room temperature closer to the set temperature by shortening the switching time interval of the operating frequency of the compressor when the change in the room temperature is large, and when the change in the room temperature is a district court, Focusing on the fact that the room temperature can be stabilized near the set temperature by increasing the frequency switching time interval, the larger the room temperature change rate, the shorter the operating frequency switching time interval, and the smaller the change rate,
Increase the operating frequency switching time interval.

For this purpose, as shown in FIG. 1, the indoor unit control section 11 of the control device to which the control method of the air conditioner of the present invention is applied uses the room temperature Tr detected by the indoor temperature detecting section 2 to change the room temperature Tr. And a switching time interval determining unit 11a for determining a switching time interval of the operating frequency of the compressor 4 in accordance with the rate of change, and operating at each time interval based on the room temperature Tr and the set temperature Ts. An operating frequency code indicating unit 10b for determining and switching the frequency code. Note that the indoor unit control unit 11 also has the function of the indoor unit control unit 1 shown in FIG.

This embodiment will be described in comparison with the previous embodiment. In the routine shown in FIG.
A process of calculating the rate of change of the room temperature Tr is executed instead of the processes of 4 and ST5. For example, the room temperature Tr1 is detected, the room temperature Tr2 is detected again after a predetermined time t has elapsed, and the difference (Tr1-Tr2) is calculated.
-Tr2) is divided by the time t to calculate the rate of change. The other processing steps may be the same as the routine of FIG. Further, instead of Table 1, a table in which the relationship between the change rate of the room temperature Tr and the operating frequency code switching time interval may be prepared in the form of a table. In this case, the greater the rate of change, the shorter the switching time interval, and the smaller the rate of change, the longer the switching time interval.

In this manner, as in the previous embodiment, when the room temperature Tr is apart from the set temperature Ts, the switching of the operating frequency code is quickened, so that the room temperature Tr is quickly brought close to the set temperature Ts. The switching of the operating frequency code becomes slower as the room temperature Tr approaches the set temperature Ts.
The operating frequency code can be switched to the operating frequency code corresponding to r, the room temperature Tr can be set to the set temperature Ts, and the fluctuation of the room temperature near the set temperature Ts can be suppressed small, that is, stable maintenance can be achieved.

In the two embodiments described above, a predetermined time (for example, 10
Minutes). In this case, after the elapse of 10 minutes, the operating frequency code is determined and switched at regular time intervals based on the room temperature Tr and the set temperature Ts as in the related art. That is, if the above-described processing is performed for 10 minutes, the room temperature Tr is settled to the set temperature Ts, and even if the operation frequency code switching time interval is longer, the room temperature adjustment is not hindered.

[0026]

As described above, according to the first aspect of the control method of the air conditioner, the operating frequency of the compressor is determined based on the room temperature and the set temperature, and the compressor is operated. When the room temperature is adjusted by switching the operation frequency every predetermined time, the operation frequency switching time interval is changed according to the difference between the room temperature and the set temperature. There is an effect that the set temperature can be quickly set, the indoor environment can be quickly set as desired, and comfort can be improved.

According to the second aspect of the present invention, in the first aspect, as the difference between the room temperature and the set temperature is larger, the switching time interval of the operating frequency is shortened.
This has the same effect as, especially when the room temperature is far from the set temperature, the switching time interval is short, so that the room temperature can be quickly set to the set temperature, and when the room temperature approaches the set temperature, the switching time interval , The overshoot and the undershoot at the room temperature can be suppressed, and the hunting can be suppressed, thereby contributing to the stabilization of the room temperature.

According to the third aspect of the present invention, when the operating frequency of the compressor is determined based on the room temperature and the set temperature, and the operating frequency of the compressor is switched every predetermined time to adjust the room temperature, Since the switching time interval of the operating frequency is changed according to the change rate of the room temperature, the room temperature can be quickly set to the set temperature by adaptively switching the operating frequency, and the indoor environment is quickly set as desired. This has the effect that comfort can be improved.

According to the fourth aspect of the invention, in the third aspect, as the change rate of the room temperature is larger, the time interval for switching the operation frequency is shortened. When the room temperature is away from the set temperature, the switching time interval becomes shorter,
Since the room temperature can be quickly set to the set temperature, and when the room temperature approaches the set temperature, the switching time interval becomes longer, so that overshoot and undershoot of the room temperature can be suppressed, and hunting can be suppressed. This has the effect of contributing to stabilization at room temperature.

According to the invention described in claim 5, according to claim 1,
The operation frequency switching time interval is changed for a predetermined time from the start of operation of the air conditioner or the compressor in 2, 3, or 4, so that the operation is performed in addition to the effects of claim 1, 2, 3, or 4. At the beginning, the difference between the room temperature and the set temperature is often large, so the effect is great.Also, after a predetermined time, the room temperature is near the set temperature, so that the operating frequency is increased as usual. By switching, room temperature can be further stabilized.

According to the invention described in claim 6, according to claim 1,
In 2, 3, or 4, the operation frequency switching time interval is changed for a predetermined time from the change of the set temperature, so that in addition to the effects of claims 1, 2, 3, or 4,
When the set temperature is changed by the remote controller, there is a difference between the room temperature (a value corresponding to the previous set temperature) and the current set temperature. Later, since the room temperature will be near the set temperature,
By switching the operation frequency as usual, the room temperature can be further stabilized.

[Brief description of the drawings]

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

FIG. 2 is a schematic flowchart for explaining the operation of the control device shown in FIG. 1;

FIG. 3 is a schematic time chart for explaining the operation of the control device shown in FIG. 1;

FIG. 4 is a schematic block diagram of a control device to which another embodiment of the present invention is applied, to which a control method of an air conditioner is applied.

FIG. 5 is a schematic block diagram of a control device of a conventional air conditioner.

FIG. 6 is a schematic time chart for explaining a control method of a conventional air conditioner.

FIG. 7 is a schematic time chart for explaining a control method of a conventional air conditioner.

[Explanation of symbols]

 1, 10, 11 Indoor unit control unit 2 Indoor temperature detection unit 3 Remote controller 4 Compressor 5 Outdoor unit control unit 10a, 11a Switching time interval determination unit 10b, 11b Operating frequency code indicating unit Tr Room temperature Ts Set temperature

Claims (6)

[Claims] An air conditioner that determines an operating frequency of a compressor based on at least a room temperature and a set temperature, and adjusts a room temperature by switching an operating frequency of the compressor at predetermined time intervals. A switching time interval of the operating frequency according to a difference between the operating frequency and a set temperature. 2. The control method for an air conditioner according to claim 1, wherein the longer the difference between the room temperature and the set temperature, the shorter the operation frequency switching time interval. 3. An air conditioner that determines an operating frequency of a compressor based on at least a room temperature and a set temperature and adjusts a room temperature by switching an operating frequency of the compressor every predetermined time. A time interval for switching the operating frequency in accordance with the rate of change of the air conditioner. 4. A control method for an air conditioner, wherein the switching time interval of the operating frequency is shortened as the rate of change of the room temperature increases. 5. The control method for an air conditioner according to claim 1, wherein the operation frequency switching time interval is changed for a predetermined time from the start of operation of the air conditioner or the compressor. 6. A method according to claim 1, further comprising the step of:
5. The control method for an air conditioner according to claim 1, wherein the operation frequency switching time interval is changed.