JPH04292741A - Air conditioner control device - Google Patents

Abstract

PURPOSE:To obtain a control device capable of making the output of an air conditioner variable in conformity with a thermal capacity of a room, minimizing frequency of repeated ON/OFF operations, and enabling comfortable air conditioning. CONSTITUTION:Room temperature is detected by a thermistor 1 and a room temperature detection means 2. Their output and the output of a room temperature setting means 3 are compared by a comparison means 4. The operation of a compressor 6 is controlled by a compressor output setting means 5 in conformity with the comparison result while heat exchange is carried out by indoor equipment 9. The ON/OFF operation of the compressor 6 is monitored by a compressor ON/OFF detection means 7. A compressor output curve is decided by a compressor output curve setting means 8, responding to the result. The compressor 6 is operated based on the decided output curve.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner control device that varies the output of the air conditioner in accordance with the heat capacity of a room and turns the air conditioner on and off at an appropriate number of times.

0002

[Prior Art] FIGS. 6 and 7 show, for example, Japanese Patent Application Laid-open No. 1-1-1
63550 is a block diagram of a conventional air conditioner control device and a graph showing the relationship between air flow rate and indoor temperature of the control method thereof, in which 10 is a control unit;
1 is an indoor temperature detector, 12 is an indoor temperature setting section, 13 is an operation switch, 14 is a blower, and 15 is a heat source device. The graph also shows the relationship between the indoor temperature measured by the blower 14, the heat source device 15, and the indoor temperature detector 11.

A conventional air conditioner control device is constructed as described above, and the heat source device 15 continues to be turned on until the room temperature TR reaches the set temperature TS. When the room temperature TR reaches the set temperature TS, the heat source device 15 is turned off, so the room temperature TR continues to fall. When the room temperature TR drops to a certain temperature lower than the set temperature TS, the heat source device 15 is turned on and the room temperature TR continues to rise. By repeating the above operations, the room temperature TR frequently rises and falls.

0004

[Problems to be Solved by the Invention] Conventional air conditioner control devices are controlled as described above. There was a problem in that the air conditioner output frequently turned on and off, causing discomfort when the maximum capacity of the air conditioner was not needed.

[0005] This invention was made in order to solve this problem, and it is possible to vary the output of the air conditioner according to the heat capacity of the room, thereby reducing the frequent turning on and off, thereby enabling comfortable air conditioning. The purpose is to obtain a control device for air conditioners.

[0006]

[Means for Solving the Problems] An air conditioner control device according to the present invention is capable of controlling a predetermined temperature in an air conditioner that performs cooling/heating operation by varying the compressor output according to the difference between a set temperature and a temperature detected by a room temperature detector. The amount of change in the compressor output determined by the temperature difference is increased or decreased depending on the number of times the compressor is operated or stopped within a period of time.

[0007] Also, the time from when the temperature detected by the room temperature detector reaches a predetermined temperature until the compressor stops is measured, and the amount of change in the compressor output with respect to the temperature difference is increased or decreased according to this time. be.

[0008]

[Operation] In the present invention, in an air conditioner that performs cooling/heating operation by varying the compressor output according to the difference between the set temperature and the temperature detected by the room temperature detector, the compressor can be operated or stopped within a predetermined period of time. By increasing or decreasing the amount of change in the compressor output determined by the temperature difference depending on the number of times, the number of times the air conditioner is repeatedly operated and stopped is reduced.

[0009] Furthermore, the time from when the temperature detected by the room temperature detector reaches a predetermined temperature until the compressor stops is measured, and the amount of change in the compressor output with respect to the temperature difference is increased or decreased according to this time. , the number of times the air conditioner is repeatedly operated and stopped is reduced.

0010

[Example] Example 1. 1 to 5 are diagrams showing an embodiment of the present invention. In the diagrams, 1 is a room temperature detector for detecting room temperature, which is composed of a thermistor. Reference numeral 2 denotes a room temperature detection means which inputs the detection signal of the thermistor 1, 3 a room temperature setting means for setting the indoor temperature, 4 a comparison means for comparing the output signals of the room temperature detection means 2 and the room temperature setting means 3, and 6 7 is a compressor, 7 is a compressor on/off detection means for counting the number of times the compressor 6 is turned on and off during an arbitrary period of time when the air conditioner is in operation, and 8 is based on the output of the compressor on/off detection means 7. Compressor output curve setting means 5 sets the amount of change in the output of the compressor 6 based on the output of the compressor output curve setting means 8 and the comparison means 4. The setting means 9 is an indoor unit.

The operation of the air conditioner control device configured as described above will be explained with reference to graphs and flowcharts shown in FIGS. 2 to 5. First, during heating, when the air conditioner starts heating as shown in Figure 2, the indoor temperature rises, and when the indoor temperature reaches Ta, the compressor output is reduced according to the difference between the indoor temperature and the set temperature. The indoor temperature rises slowly. When the indoor temperature reaches Tb, the compressor output is stopped and the stopped state is continued until it reaches Ta. T
When the temperature reaches a, the compressor starts operating and operates again at an output corresponding to the difference between the room temperature and the set temperature. On the other hand, as shown in Fig. 3, several compressor output curves are prepared for the difference between the indoor temperature and the set temperature, such as Q1...Qi...Qn. from t0 to t3
Count the number of times the compressor has been turned on and off within a given period of time, and make decisions based on this number. In this method, as shown in FIG. 4, after the start of operation, when the room temperature reaches Ta, the compressor on/off detection means 7 detects the
Count the number of times the compressor is turned on and off up to 3. Next, if the heat capacity of the room is small compared to the air conditioner output,
As shown in Qa in FIG. 2, the compressor frequently turns on and off. Number of on/off times N within a certain period of time
is greater than the appropriate number of times upper limit N0, so in this case, a curve with a gentler slope is used in FIG. 3 to prevent frequent on/off operations and to set an appropriate number of on/off times. moreover,
If the compressor output is insufficient, such as when there are many people coming and going or the indoor temperature drops due to ventilation of the room, the indoor temperature will not reach the set temperature as shown by the Qc curve in FIG. 2. Since the number of on/off times N within a certain period of time is less than the appropriate number of times lower limit value N1, in this case, a curve with a steeper slope in Fig. 3 is used to prevent the indoor temperature from reaching the set temperature, and Qb Make appropriate on/off times like a curve.

Example 2. Apart from the above embodiment, the compressor output curve can be set by counting the time it takes for the indoor temperature to reach Tb from Ta in Fig. 2, and determining the compressor output curve according to this count value. rear,
When the indoor temperature reaches Ta, the compressor on/off detection means 7
The time t until the indoor temperature reaches Tb is counted. Next, if the heat capacity of the room is small relative to the air conditioner output, the compressor will frequently turn on and off, as shown by Qa in FIG. Since the time t required for the indoor temperature to reach Tb from Ta is shorter than the lower limit value tMIN of the appropriate time, in this case, a curve with a gentler slope is used in Figure 3 to prevent frequent on/off operations. Temperature is from Ta to Tb
Make the time to reach the appropriate time. On the other hand, if the compressor output is insufficient, such as when there are many people coming and going or the indoor temperature drops due to ventilation of the room, the indoor temperature does not reach the set temperature as shown by the Qc curve in FIG. 2. The indoor temperature is T
The time t from a to Tb is the upper limit of the appropriate time tM
Since it is longer than AX, in this case, use a curve with a steeper slope in Figure 3 to prevent the indoor temperature from reaching the set temperature, and set an appropriate time for the indoor temperature to reach Tb from Ta like the Qb curve. Make it a good time.

Example 3. In addition, although heating was described in the first and second embodiments, the same effects as in the above embodiments can be obtained also in the case of cooling.

Example 4. Moreover, the above-mentioned Example 1. and Example 2. Although the compressor 6 is used as the heat source device in the above description, other heat source devices may be used.

[0015]

[Effects of the Invention] As explained above, this invention is configured to vary the compressor output according to the difference between the indoor temperature and the set temperature, thereby reducing the repetition of starting and stopping the air conditioner output. This eliminates discomfort and provides a more comfortable air-conditioned environment.

[Brief explanation of drawings]

FIG. 1 is an overall block diagram showing embodiments 1 and 2 of the present invention.

FIG. 2 is a graph showing indoor temperature control in Examples 1 and 2 of the present invention.

FIG. 3 is a graph showing compressor output curves in Examples 1 and 2 of the present invention.

FIG. 4 is a flowchart showing the operation in the first embodiment of the present invention.

FIG. 5 is a flowchart showing the operation in a second embodiment of the present invention.

FIG. 6 is a block diagram showing a conventional air conditioner control device.

FIG. 7 is a graph showing indoor temperature control in a conventional air conditioner control device.

[Explanation of symbols]

1 Room temperature detector 2 Room temperature detection means 3 Room temperature setting means 4. Comparison means 5 Compressor output setting means 6 Compressor 7 Compressor on/off detection means 8 Compressor output curve setting means

Claims (2)

[Claims] Claim 1: In an air conditioner that performs cooling/heating operation by varying compressor output according to the difference between a set temperature and a temperature detected by a room temperature detector, the compressor output is varied according to the number of times the compressor is operated or stopped within a predetermined period of time. A control device for an air conditioner, characterized in that the amount of change in the compressor output determined by the temperature difference is increased or decreased. 2. The method is characterized in that the time from when the temperature detected by the room temperature detector reaches a predetermined temperature until the compressor stops is measured, and the amount of change in the compressor output with respect to the temperature difference is increased or decreased in accordance with this time. An air conditioner control device according to claim 1.