JPH04236044A - Air conditioner and its controlling method - Google Patents

Abstract

PURPOSE:To eliminate a useless operation in a pre-operation with a turned-on timer function for an air conditioner and improve the efficiency of the pre- operation and save energy. CONSTITUTION:A pre-operation time under a turned-on timer function is kept constant, the remaining time of the pre-operation and the difference between a set temperature set by a room temperature setting part (a remote controller or the like) 1 and the room temperature detected by a room temperature sensing part (a thermistor or the like) 2 are inputted for a fuzzy controller 5 and a fuzzy calculation is carried out according to a predetermined rule. The amount of increase or decrease of the operating frequency of a compressor is calculated on the basis of the result of this calculation and at the same time the present operating frequency of the compressor is increased or decreased and the compressor at the pre-operating time is operated in a quite fine control manner.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner having a completion timer function, and more particularly to a control method for an air conditioner that improves the efficiency of preliminary operation of the completion timer function.

0002

[Conventional example] Conventionally, in this type of air conditioner, the difference between the set temperature and the room temperature is detected, and the pre-operation time before the on-timer setting time is determined according to the temperature difference. For example, if the temperature difference is large, Sometimes the pre-operation time is lengthened, that is, the operation is started earlier, and when the temperature difference is small, the pre-operation time is shortened, that is, the operation is started later.

[0003] By doing this, the temperature inside the room reaches the temperature set by a remote control or the like at the time set by the turn-on timer, and it becomes possible to maintain a comfortable environment in the room from the time set by the turn-on timer.

[0004] The preliminary operation time is determined, for example, according to Table 1 below.

[Table 1]
Difference between set temperature and room temperature
Less than 20K 1
Less than 5K 20K or more ~15K or more ~10K or more Less than 10K Pre-driving time 44 minutes 30
Minutes 19 minutes 10 minutes That is, for example, if the set time of the turn-on timer is 7:00 a.m., for example, if a difference between the set temperature and the room temperature is detected one hour ago, and this temperature difference is 20K (Kelvin) or more, then the air The operation of the harmonizer started at 6:16 a.m., 44 minutes earlier. However, if the temperature difference is 15K or more and less than 20K, then at 6:30 a.m., 30 minutes earlier, the temperature difference is 10K or more.
K or more, but less than 15 K, 19 minutes earlier at 6:41 am, and if the temperature difference is less than 10 K, 10
Preliminary operation of the air conditioners will begin at 6:50 a.m., a minute before the event.

[0006]

By the way, in the above air conditioner control method, the pre-operation time is determined by the difference between the set temperature and the room temperature, and for example, if the temperature difference is 2.
If the temperature is above 0K and preliminary operation is performed 44 minutes in advance, the operating frequency of the compressor will be set to the highest value in order to quickly bring the indoor temperature to the set temperature, since the outside air temperature is not taken into consideration. The operating frequency is controlled according to the difference between the temperature and the room temperature.

[0007] Therefore, for example, when the outside air temperature is relatively high, since the heating capacity is sufficiently large, the room temperature reaches the set temperature in less than 44 minutes, resulting in unnecessary operation after that. This was not desirable from an energy saving perspective. Further, for example, when the outside air temperature is low, the room temperature may not reach the set temperature even after 44 minutes have passed.

[0008] Although the above-mentioned problem has been explained with respect to the heating operation, it similarly occurs during the cooling operation.

The present invention was made in view of the above problems, and its purpose is to control the operating frequency of the compressor during preliminary operation according to the remaining time of preliminary operation and the difference between the set temperature and room temperature, thereby preventing unnecessary operation and To provide an air conditioner that can eliminate discomfort at the end of operation, improve operating efficiency, and save energy.

0010

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a method for controlling an air conditioner that sets the indoor temperature to a set temperature in advance using a completion timer function.
The preliminary operation time of the completion timer function is set constant, the remaining time of the preliminary operation is input 1, and the difference between the temperature set by the remote control etc. and the room temperature is input 2, fuzzy calculation is performed according to a predetermined rule, and the calculation result is The gist is that the operating frequency of the compressor can be increased or decreased accordingly.

[0011]

[Operation] According to the fuzzy calculation rule (fuzzy rule) in the above method, the shorter the remaining time of the pre-operation and the larger the difference between the set temperature and the room temperature, the greater the increase in the current operating frequency of the compressor. Furthermore, the longer the remaining pre-operation time and the smaller the difference between the set temperature and the room temperature, the greater the reduction in the operating frequency of the compressor. In other words, since the operating frequency of the compressor is determined extremely precisely during pre-operation for a certain period of time, the room temperature will not reach the set value before the pre-operation ends, and even after the pre-operation ends. There is no possibility that the set value will not be reached.

0012

Embodiments Hereinafter, embodiments of the present invention will be described based on FIGS. 1 to 12. In FIG. 1, an air conditioner with a completion timer function includes a room temperature setting unit 1 such as a remote control that sets the indoor temperature, and a room temperature detection unit 2 that includes a thermistor and its peripheral circuits that detect the current temperature in the room. and a comparison unit 3 that calculates the difference between the set temperature and the room temperature,
A temperature difference/
The voltage converter 4 and the remaining time of preliminary operation by the completion timer function are input 1, the output voltage value of the temperature difference/voltage converter 4 is input 2, and the rules in Table 2 shown below (
Fuzzy (Fu
a fuzzy controller 5 that calculates a voltage value (for example, 1V to 5V) corresponding to the calculation result;
A voltage/frequency converter 6 is provided that outputs the output voltage of the fuzzy controller 5 as a signal indicating an increase/decrease in the operating frequency of the compressor to a control unit (shown in the figure) of the air conditioner.

[0013] The preliminary operation time of the completion timer function is a constant value (for example, 40 minutes), and the control section (not shown) calculates the remaining time and outputs a voltage corresponding to the result of this calculation. It has become.

Next, a control method applied to the air conditioner having the above configuration will be explained with reference to FIGS. 2 to 12.

First, it is assumed that the completion timer function of the air conditioner is activated and, for example, 40 minutes before the start timer time, the operating frequency of the compressor is determined according to the difference between the set temperature and the room temperature. . During the 40 minutes (pre-operation time), the comparison section 3 obtains the difference between the set temperature and the room temperature, and calculates the remaining time of the pre-operation.

[0016]The voltage corresponding to the remaining pre-operation time (for example, 1V to 5V) is input 1, and the temperature difference is the temperature difference/
It is converted into a voltage (for example, 1V to 5V) by the voltage converter 4,
This voltage is input to the fuzzy controller as input 2. As shown in the relationship diagram between the remaining preliminary operation time and input voltage in Figure 2, the above input 1 becomes 5V when the remaining preliminary operation time is 40 minutes or more, and conversely, the remaining time is 0 minutes. In this case, the voltage is 1V.

Furthermore, as shown in the relationship between temperature difference and input voltage in the same figure, input 2 becomes 5V when the temperature obtained by subtracting the room temperature from the set temperature is 20K or more; If the difference is 0K, it will be 1V. In addition, in the fuzzy rule of this invention, 1V, 0 minutes, 0K and -10Hz are NE (Negative; short, small, frequency reduction), and 3V is ZR (Zero; moderate, zero,
current frequency), 5V is PO (Positive; long,
large frequency increase).

As shown in FIG. 2, the fuzzy controller 5 outputs a voltage (1
V to 5V) is output. The fuzzy calculation for obtaining the output voltage is executed according to the fuzzy rules written in the fuzzy controller 5, and the fuzzy rules are based on, for example, those shown in Table 2 below.

For example, during heating, the longer the remaining pre-operation time and the smaller the difference between the set temperature and the room temperature, the lower the operating frequency of the compressor, and the larger the temperature difference, the smaller the reduction in the operating frequency. Leave as is. Conversely, the shorter the pre-operation time and the greater the difference between the set temperature and the room temperature, the greater the operating frequency, and the smaller the temperature difference, the smaller the increase in the operating frequency, for example, the current state is maintained.

[Table 2]
Pre-operation remaining time (input 1)
P.O.
ZR NE
(long) (medium) (short)
Temperature difference PO (large) ZR (1)
PO (4) PO (7) (input 2)
(Current status) (Increase)
(Increase) ZR (moderate) NE (2) ZR (5) PO
(8)
(Decrease) (Current status) (
increase) NE (small) N
E (3) NE (6) ZR (9)
(Decrease) (Decrease) (Current situation)
The symbols PO, ZR, and NE shown in Table 2 have the same meanings as in FIG. 2, so their explanations will be omitted. Moreover, when the above Table 2 is expressed as a formula, it is as follows. (1) IF input 1=PO AND input 2=P
O THEN Output = ZR (2) IF Input 1 =
PO AND Input 2 = ZR THEN Output = NE (3) IF Input 1 = PO AND Input 2 = NE THEN Output = NE (4) IF Input 1 = ZR AND Input 2 = PO THEN
Output = PO (5) IF Input 1 = ZR AND
Input 2 = ZR THEN Output = ZR (6) IF
Input 1=ZR AND Input 2=NE TH
EN Output = NE (7) IF Input 1 = NE A
ND Input 2=PO THEN Output=PO(8
)IF Input 1=NE AND Input 2=ZR
THEN Output = PO (9) IF Input 1 = NE
AND Input 2=NE THEN Output=Z
R Then, a fuzzy operation is performed using the input 1 and the input 2 according to the fuzzy rule, and the membership functions shown in FIGS. 3 to 5 are used for the operation. An example of fuzzy operation using the membership function will be explained with reference to FIGS. 3 to 11. For example, input 1
is 3.5V and input 2 is 2.5V, that is, the remaining pre-operation time is between 20 minutes and 40 minutes, and the temperature difference is between 0K and 10K. In the membership function shown in , the intersection point with the membership function is found by extending input 1 upward, but if NE=0, ZR
=0.75 and PO=0.25, the membership functions from which the intersection is obtained are ZR and P0.

Therefore, among the fuzzy rules shown in Table 2 above, fuzzy rules (1) to (6) whose input 1 is related to ZR and PO are subjected to fuzzy calculations. Regarding input 2, the intersection point is found in the same way, but N
Since E=0.25, ZR=0.75, and P0=0, among the fuzzy rules shown in Table 2 above, input 2 is N
Fuzzy rules related to E and ZR (2), (3)
, (5), (6), (8), and (9) are subjected to fuzzy operation. Also, since the relationship is an AND operation (product logic), four of the fuzzy rules shown in Table 2, fuzzy rules (2), (3), (5), and (6), are fuzzy operations. This means that it is the subject of

[0022] Then, to explain the fuzzy operation for the above object, for example, the operation based on the fuzzy rule (6), the IF
Input 1=ZR AND Input 2=NE THE
When N output = NE, as shown in FIG.
F Input 1 = ZR", the vertical axis coordinate of the intersection of the membership functions of input 1 and ZR is found to be a = 0.75.
is obtained.

Furthermore, as shown in FIG. 7, in the part where "input 2 = NE", when the vertical axis coordinate of the intersection of the membership functions of input 2 and NE is found, b = 0.25 is obtained. . Since input 1 and input 2 are combined with AND, the one with the smaller ordinate will be taken, but in this case the same 0.2
5, so c=0.25.

Therefore, as shown by the diagonal line in FIG. 8, in the part "THEN output = NE", the membership function of NE is cut along the horizontal axis of c=0.25, and the lower part of the horizontal axis is In other words, a trapezoidal figure becomes the output value.

By the same calculations as above, output figures are obtained as the calculation results of other fuzzy rules (2), (3), (5), and fuzzy rules (8), (9), (13), (
14) can be summarized as shown by diagonal lines in FIGS. 9 to 11. In Figure 9, input 1 is PO and input 2
is the output figure as the calculation result of fuzzy rule (2) where is ZR, and in Figure 10, input 1 is PO and input 2 is N
FIG. 11 shows an output figure as the result of the calculation of the fuzzy rule (3) in which input 1 is ZR and input 2 is ZR.

Next, as shown by the diagonal lines in FIG. 12, a figure is obtained by adding the four output figures shown in FIGS. ) is obtained, and this value becomes the output voltage as a result of the fuzzy calculation. Note that the center line is a line where, when FIG. 12 is divided into left and right by a line, the areas on the right and left are equal. So, for example, if the 1V of the figure is 5 cm, and the figure is quantized every 5 mm and added together, it becomes 1290, so 1290 is 1/2
By calculating the center of gravity position 645 and converting this position, an output voltage of 2.47V can be obtained.

Next, from the fuzzy controller 5, 2
．． A voltage value of 47V is output, this voltage value is converted into an increase/decrease in the operating frequency by the voltage/pre-operation time converter 6, and this increase/decrease signal is output to the control unit of the air conditioner. In this case, as shown in FIG. 2, since the output voltage of the fuzzy calculation result is 2.47V, the increase/decrease in the operating frequency is approximately -3 Hz. Therefore, the current frequency of the compressor of the air conditioner will be lowered by 3 Hz.

In this way, when performing preliminary operation using the completion timer function, the remaining time of the preliminary operation and the difference between the set temperature and the room temperature are input, a fuzzy operation is performed according to a predetermined fuzzy rule, and the result of this operation is Since the current operating frequency is increased or decreased by determining the increase or decrease of the compressor operating frequency according to There will be no more troubles such as reaching the temperature or not reaching the set temperature.

Note that the fuzzy operation described above is a typical one, and various other methods may also be used. Furthermore, membership functions other than those shown in FIGS. 3 to 7 may also be used. Furthermore, for the final calculation, not only the method of using the center of gravity on the horizontal axis as the output voltage but also other methods may be used.

Further, the fuzzy controller 5 may be replaced with a microcomputer or a discrete control circuit having the above-mentioned fuzzy calculation function. Furthermore, although the fuzzy controller 5 used in the above embodiment has two input terminals and one output terminal, it is not necessary to limit the number of input/output terminals to these in principle.

[0031]

As explained above, according to the present invention, there is an air conditioner having a completion timer function, in which the pre-operation time by the completion timer function is set constant, and the remaining time is set during the pre-operation. The difference between the set temperature and the room temperature is obtained, the calculated remaining time is used as input 1, the temperature difference is used as input 2, fuzzy calculation is performed according to a predetermined rule, and the operating frequency of the compressor is adjusted according to the calculation result. In addition to increasing/decreasing the current operating frequency, the compressor can be operated very precisely during pre-operation, so the room temperature does not reach the set temperature too early and there is no waste. The operation can be eliminated, the efficiency of the pre-operation can be improved, and conversely, the room temperature will not reach the set temperature at the end of the pre-operation, and there will be no discomfort.

[Brief explanation of the drawing]

FIG. 1 is a schematic control block diagram of an air conditioner showing an embodiment of the present invention.

[Fig. 2] Relationship diagram between remaining pre-operation time, temperature difference, and input/output voltage to explain the control method applied to the air conditioner shown in Fig. 1

[Fig. 3] Membership function diagram explaining the control method applied to the air conditioner shown in Fig. 1

[Fig. 4] Membership function diagram explaining the control method applied to the air conditioner shown in Fig. 1

[Fig. 5] Membership function diagram explaining the control method applied to the air conditioner shown in Fig. 1

[Fig. 6] A diagram explaining fuzzy calculation of the control method applied to the air conditioner shown in Fig. 1.

[Fig. 7] A diagram explaining fuzzy calculation of the control method applied to the air conditioner shown in Fig. 1.

[Fig. 8] A diagram explaining fuzzy calculation of the control method applied to the air conditioner shown in Fig. 1.

FIG. 9 is a diagram illustrating fuzzy calculation of the control method applied to the air conditioner shown in FIG. 1.

FIG. 10 is a diagram explaining fuzzy calculation of the control method applied to the air conditioner shown in FIG. 1;

FIG. 11 is a diagram illustrating fuzzy calculation of the control method applied to the air conditioner shown in FIG. 1.

FIG. 12 is a diagram explaining fuzzy calculation of the control method applied to the air conditioner shown in FIG. 1.

[Explanation of symbols]

1 Room temperature setting section (remote control, etc.) 2 Room temperature detection part (thermistor, etc.) 3 Comparison section 4 Temperature difference/voltage conversion section 5 Fuzzy controller 6 Voltage/frequency conversion section

Claims (2)

[Claims] [Claim 1] A method for controlling an air conditioner that sets the indoor temperature to a set temperature in advance using a completion timer function, comprising:
The pre-operation time of the completion timer function is set constant, the remaining pre-operation time is input 1, and the difference between the temperature set by the remote control etc. and the room temperature is input 2, and fuzzy calculations are performed according to predetermined rules. 1. A control method for an air conditioner, characterized in that an increase or decrease in the operating frequency of a compressor is determined according to the operating frequency of the compressor. 2. The fuzzy rule in the fuzzy controller is such that the input 1 is PO (long) and the input 2 is PO (long).
is PO (large), input 1 is ZR (medium)
If input 2 is ZR (medium) and input 2 is NE (small), or if input 1 is NE (short) and input 2 is NE (small), then the output is ZR (current frequency ), the input 1 is P0 (long), and the input 2 is ZR
(medium) or NE (small), or if input 1 is ZR (medium), the output is N
E (frequency reduction) and input 1 is ZR (medium) and input 2 is PO (large);
is NE (short) and input 2 is PO (large) or Z
2. The method of controlling an air conditioner according to claim 1, wherein the output is set as PO (frequency increase) when the signal is R (moderate).