KR0149228B1 - Temperature control method of airconditioner - Google Patents

Abstract

The temperature difference between the room temperature and the set temperature is input 1, the temporal change of the room temperature is input 2, and the fuzzy calculation is performed according to the control rules using the membership function of the membership function section 1, In the control method of the air conditioner which controls the switching amount of the operation frequency of the compressor 2, and switches the operation frequency every predetermined interval (t seconds), and performs room temperature control, the room temperature detection part 4 is always carried out during operation. The room temperature (Tr) is detected, and the room temperature change amount (Tr2-Tr1) is calculated by the room temperature change amount calculation unit 5 at that time, and when the calculated change amount exceeds a predetermined value, it is determined that the room temperature is rapidly changing. And immediately perform the purge operation to switch the operating frequency of the compressor 2.

Description

How to control the temperature of the air conditioner

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

FIG. 2 is a flowchart for explaining a control method of the control device of the air conditioner shown in FIG.

3 is a schematic graph for explaining the operation of the control device of the air conditioner shown in FIG.

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

5 is a schematic diagram of a membership function used in the control device shown in FIGS. 1 and 4;

6 is a schematic diagram of a membership function used in the control device shown in FIGS. 1 and 4;

FIG. 7 is a schematic diagram of the membership function used in the control device shown in FIGS. 1 and 4. FIG.

8 is a schematic graph for explaining the operation of the control device of the air conditioner shown in FIG.

9 is a schematic graph for explaining the operation of the control device of the air conditioner shown in FIG.

10 is a schematic graph for explaining the operation of the control device of the air conditioner shown in FIG.

* Explanation of symbols for main parts of the drawings

1: fuzzy control memory 2: compressor

3: control device 4: room temperature detection unit

5: room temperature change amount calculation unit

The present invention relates to a control method of an air conditioner using purge control for control at room temperature in an inverter type air conditioner.

Conventionally, this type of air conditioner performs control of room temperature by purge control as shown in FIG. For example, the air conditioner is a fuzzy control having a control rule as shown in Equations 1 (a) to 1 (f) below and a membership function as shown in FIGS. 5 to 7. It consists of the storage part 1 and the control apparatus 3 which controls the switching amount of the operation frequency of the compressor 2 according to the fuzzy calculation result using the control rule and the membership function. With the temperature difference between the room temperature Tr and the set temperature Ts as input 1 and the amount of change in the room temperature as input 2, the degree to which the inputs 1 and 2 satisfy the control rule was calculated with reference to the membership function (purge operation). ).

[Equation 1]

(a) E NB and D F for NB PB

(b) E NB and D F for PB ZR

(c) E ZR and D F for NB PB

(d) E ZR and D F for ZR ZR

(e) E PB and D F for PB NB

(f) E PB and D F for NB ZR

here

E: The difference between the room temperature (Tr) and the set temperature (Ts)

D: temporal change in room temperature (Tr2-Tr1) / min)

F: switching amount of the operating frequency of the compressor

In Equations 1 (a) to 1 (f), the input variable E of the condition part of the control rule is (Tr-Ts), and the input variable D is the amount of change at room temperature (for example, ((Tr2-Tr1) / minute) ), And the output variable F of the result portion is the switching amount of the operating frequency of the compressor. In other words, D is the amount of change in room temperature, E is the temperature difference (Tr-Ts), and F is the amount of change in the operating frequency of the compressor. In addition, in the above-mentioned equation and the diagram of the membership function shown in FIGS. 5 to 7, NB is negative big and ZR is zero, that is, there is no change. And PB is a positive big.

And the control rules and FIG. 5 of the above formula so as to show intermediate characteristics for both the stability of the room temperature and the response speed to the rapid change in the room due to external disturbance (door opening and closing). The membership function shown in Figs. Moreover, the said control apparatus 3 controls an indoor fan, an outdoor fan, etc. based on room temperature, a preset temperature, etc.

The purge calculation is executed at predetermined intervals (t seconds) during the operation of the air conditioner, and the switching amount of the operating frequency of the compressor 2 is controlled based on the purge calculation result. The predetermined interval (t seconds) is set in advance to the most appropriate value based on the result of the test in accordance with the actual use state of the air conditioner. For example, the predetermined interval is set so as not to be too long or too short.

That is, as shown in FIG. 8, if the predetermined interval is a long value t1 (> t), the switching speed of the operating frequency of the compressor 2 to the fluctuation of the room temperature Tr is slowed down and the stability of the room temperature is remarkably increased. It will worsen, which in turn will interfere with comfort. As shown in Fig. 9, the value t2 (where the predetermined interval is short) ( t), the switching speed of the operating frequency of the compressor 2 with respect to the fluctuation of the room temperature (Tr) is increased, and the stability of the room temperature is extremely good. However, since the switching of the operating frequency is frequently performed, the operation is continued for a long time. Therefore, the power consumption of the air conditioner increases, resulting in poor operating efficiency.

Recently, the predetermined interval (t seconds) is set to an intermediate value between the t1 and t2.

However, in the control method of the above air conditioner, as shown in FIG. 10, when the room temperature (Tr) is suddenly changed due to external interference or the like, for example, a window is temporarily opened during the heating operation, and thus the room temperature is rapidly decreased. In this case, when the operation frequency of the compressor 2 is switched only every predetermined interval (t seconds), the response speed is slowed, that is, the recovery of the room temperature is slowed down, and the room temperature is a comfortable value. It takes a long time to become, and eventually the comfort is impaired.

SUMMARY OF THE INVENTION An object of the present invention is to provide a control method of an air conditioner that has a good response speed against external disturbances and the like, which can quickly restore the room temperature to its original condition and prevent the comfort from being impaired.

In order to achieve the above object, the present invention controls the compressor constituting the indoor fan, the outdoor fan and the refrigeration cycle based on at least the indoor temperature and the set temperature, and controls the temperature of the room by blowing cold or hot air into the room The input temperature difference between the detected room temperature and the set temperature is set as input 1, and the change amount of the room temperature is set as input 2, and fuzzy is performed using a control rule and a membership function preset based on these inputs 1 and 2. The control method of the air conditioner which computes and controls the switching amount of the operation frequency of the said compressor by every predetermined interval based on this purge calculation result is provided. The indoor temperature is detected during operation of the air conditioner to calculate the amount of change in the room temperature, and when the calculated amount of change exceeds a predetermined value, the switching amount of the operating frequency of the compressor is controlled.

In this manner, at the time of operation of the air conditioner (at room temperature control by purge control), the room temperature (Tr) is always detected, and the amount of change in the room temperature ((Tr2-Tr1) / min) is calculated each time. When the amount of change calculated in this way exceeds a predetermined value, it is determined that the room temperature suddenly fluctuates, and the switching amount of the operating frequency of the compressor is calculated immediately before reaching the predetermined interval time. With this output, the operating frequency of the compressor is switched. As a result, the room temperature is quickly returned to the set temperature or the vicinity of the set temperature, whereby the restoration of the room temperature is performed quickly.

Therefore, even if the room temperature changes rapidly due to external interference such as opening and closing of a window or door, the room temperature can be quickly restored to the set temperature (or near the set temperature). Moreover, the room temperature recovery performance of the room temperature after external interference can be improved and comfort can always be aimed at.

The control method of the air conditioner of the present invention controls the switching amount of the operating frequency of the compressor by purging based on input 1 (temperature difference between room temperature and set temperature) and input 2 (temporal change of room temperature), and The operating frequency is switched at predetermined intervals (t seconds) to perform room temperature control. During operation, room temperature (Tr) is always detected, and the amount of change in room temperature ((Tr2-Tr1) / min) is calculated each time. The calculation method of the change amount ((Tr2-Tr1) / min) at room temperature and the switching amount of the operating frequency will be described with reference to the flowchart of FIG. In step 10, the operating frequency is switched at predetermined intervals (t seconds). In step 11, Tr at the time of operation of the air conditioner is detected and set to Tr1. In the twelfth step, if the detection of Tr is a predetermined interval, the next Tr is detected in step 13. In step 14, Tr-Tr1 If Ts, in step 15, Tr is Tr2. Otherwise return to step 11. In step 17, a fuzzy operation is executed, and step 18 returns to step 10. In step 12, the predetermined interval is measured by a timer. If the interval is shortened, Tr is detected in step 16, and Tr2 is used to execute the purge operation of step 17. In this way, when the predetermined value of the calculated change amount is exceeded, it is determined that the room temperature has suddenly changed, and the operating frequency of the compressor is immediately switched. Then, the control rules shown in the above formulas 1 (a) to 1 (f) and the membership function shown in Figs. 5 to 7 in the fuzzy control are used.

Therefore, as shown in FIG. 1, the control apparatus 3 of the air conditioner of this invention inputs the room temperature detection signal from the room temperature detection part 4, and changes the change amount of room temperature ((Tr2-Tr1) / minute). The room temperature change amount calculating part 5 to calculate is provided. Incidentally, the same parts as those in FIG. 4 and the parts corresponding to those shown in FIG. 4 are denoted by the same reference numerals, and redundant description thereof will be omitted. The amount of change in the room temperature change amount calculating section 5 is calculated every time shorter than the predetermined interval (t seconds).

Next, the control method of the control apparatus of the air conditioner comprised as mentioned above is demonstrated in detail with reference to the graph of FIG. First, the indoor fan, the outdoor fan, the compressor 2 and the like are controlled based on the heating operation of the air conditioner (for example, the operation such as the set temperature and the room temperature set by the remote controller).

In the control apparatus 3, a fuzzy operation is executed in accordance with the control rule shown in the above equation by using the membership functions shown in FIGS. 5 to 7, and room temperature control is performed based on the fuzzy calculation result. All. In this case, the purge operation is executed at predetermined intervals (t seconds) as in the prior art, and the switching amount of the operating frequency of the compressor 2 is controlled based on the calculation result.

In addition, during the operation of the air conditioner, that is, at the time of controlling the room temperature, the room temperature change amount calculating section 5 of the control device 3 calculates the change amount of the room temperature ((Tr2-Tr1) / min), and the calculated change amount It is determined whether or not the predetermined value is exceeded. This predetermined value is determined assuming a case where the room temperature suddenly changes due to external interference (for example, opening and closing of a window or door).

Here, at the arrow A point in FIG. 3, if the window is opened and the outside air flows into the room, the room temperature drops to the arrow C point. Here, point C is a point where the value of Tr-Tr1 exceeds predetermined value before t passes. At this time, if the calculated change amount by the room temperature change amount calculating section 5 exceeds a predetermined value, it is determined that the fluctuation of the room temperature is rapidly falling, and the compressor 2 immediately without waiting for the elapse of the predetermined interval (t seconds). ) Operating frequency is switched. That is, the purge operation is executed and the switching amount of the operating frequency of the compressor 2 is controlled, so that the room temperature quickly rises to reach the set temperature as shown by the solid line in FIG.

When the room temperature returns to the original state and the room temperature change amount is equal to or less than a predetermined value, this room temperature control is performed in a conventional manner, that is, the operating frequency of the compressor 2 is switched every predetermined time (t seconds).

As described above, when purging the switching amount of the operating frequency of the compressor 2 at every predetermined interval (t seconds), the room temperature is always detected so that the change amount of the room temperature ((Tr2-Tr1) / minute) is shorter than this t seconds. Calculate every time. When the calculated change amount exceeds a predetermined value, it is determined that the room temperature has changed rapidly, and the operating frequency of the compressor 2 is switched. Therefore, the room temperature can be quickly returned to the set temperature (or near the set temperature), and the recovery performance of the room temperature can be improved. Therefore, deterioration of the indoor environment can be suppressed, and comfort can be improved.

Claims (1)

The detected indoor temperature and the set temperature when controlling the indoor temperature by controlling the indoor fan, the outdoor fan, and the compressor constituting the refrigeration cycle based on at least the indoor temperature and the set temperature, and blowing cold or warm air into the room. The difference in temperature is set as input 1, the change amount of the room temperature is set as input 2, and fuzzy calculation is performed using a control rule and a membership function preset based on these inputs 1 and 2, and the fuzzy calculation result is A control method of an air conditioner that controls the switching amount of an operating frequency of the compressor at predetermined intervals, wherein the room temperature is detected during operation of the air conditioner to calculate the change amount of the room temperature, and the calculated change amount is small. In the air conditioner, it characterized in that the switching amount of the operating frequency of the compressor when the stationary Temperature control method.