JPH0755224A - Room temperature adjustment control method - Google Patents

Abstract

PURPOSE:To ensure comfortable heating and cooling by estimating operation-off temperature based upon a room temperature change between the room temperature upon operation-off and that after the lapse of delay time of compressor operation starting and based upon a temperature difference between set temperature and the room temperature after the lapse of the delay time of the operation starting. CONSTITUTION:A compressor 10 is rotated at predetermined revolutions in operation, and starts its operation as room temperature Tr becomes operation-on temperature Ton while it stops its operation as the room temperature Tr becomes operation-off temperature Toff. A room temperature control part corrects the operation-off temperature Toff until that by estimating the proper operation-off temperature Toff until predetermined delay time Td is lapsed since the compressor 10 stops after the room temperature Tr becomes the operation-off temperature Toff. Then, the corrected operation-off temperature Toff is used to judge whether or not the room temperature Tr reaches the operation-off temperature Toff. Operation and interruption of the compressor 10 is fuzzy-controlled by correcting the operation-off temperature Toff at all times in such a manner, whereby the room temperature Tr is adjusted to about set temperature Ts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a room temperature control method. Specifically, the present invention relates to a room temperature adjustment control method by an air conditioner (air conditioner) that performs a cooling operation and a heating operation using a compressor having a constant rotation speed.

[0002]

2. Description of the Related Art In a constant speed air conditioner, that is, in an air conditioner of a type in which a compressor having a constant rotation speed is used for on / off control of the compressor, a constant operation on-temperature and operation off-temperature depend on a set temperature. When the room temperature reaches the operation-on temperature, the compressor is operated, and when the room temperature reaches the operation-off temperature, the compressor is stopped and the room temperature is adjusted to the vicinity of the set temperature.

FIG. 6 is a diagram showing the room temperature control in a conventional air conditioner. FIG. 6 (a) shows the state of room temperature change during heating operation, and FIG. 6 (b) shows the compressor control. The status (running, stop) is shown. The room temperature control during the heating operation will be described with reference to FIG. When heating the air conditioner is turned on, the room temperature rises, and when the room temperature reaches the operation-off temperature, the compressor stops and the room temperature gradually decreases. When the room temperature decreases to the operation-on temperature, the compressor restarts operation, but if restarted immediately after the compressor is stopped, excessive pressure is applied to the compressor.
Until d (about 3 minutes) has elapsed, the compressor is not operated even if it reaches the operating ON temperature, and the compressor is protected. Therefore, at the beginning of heating the air conditioner on, the compressor does not operate even when the room temperature reaches the operation on temperature,
When the delay time Td has passed, the compressor starts operating.
Immediately after the air conditioner is turned on, the room walls, floor, ceiling, etc. are cold, so the room temperature drops sharply during the delay time Td after the compressor stops, but the room walls and floor, When the ceiling or the like is heated, the decrease in room temperature during the delay time Td is alleviated, and finally the room temperature reaches the operation-on temperature after the delay time Td. After this, the compressor is operated and stopped between the operation-on temperature and the operation-off temperature, and the room temperature is also maintained between the operation-off temperature and the operation-on temperature.

[0004]

In the conventional method for controlling the room temperature of the air conditioner as described above, immediately after the air conditioner is turned on, the walls, floor, ceiling, etc. of the room are cooled. However, even if the room temperature reaches the set temperature, the walls, floor, ceiling, etc. of the room are still cold, and when the compressor stops, the room temperature drops sharply due to radiation from the surroundings (area B in FIG. 6). When the room temperature drops, the compressor may be operated immediately, but once the compressor is stopped, the delay function works to protect the compressor, and the operation of the compressor cannot be resumed until a certain delay time Td elapses. There was a drawback that it felt quite chilly while the compressor was stopped.

Similarly, when the cooling operation is performed, the situation is exactly the same as the heating operation, and immediately after the cooling is turned on,
Due to the heat of the walls, floor, and ceiling of the room, the temperature of the room has risen too much until the delay time Td elapses after the compressor is stopped.

The present invention has been made in view of the above-mentioned drawbacks of conventional examples, and an object thereof is to provide an air conditioner according to how cold or warm the wall, floor, or ceiling of a room is. It is an object of the present invention to provide a room temperature adjustment control method capable of comfortable heating and cooling.

[0007]

SUMMARY OF THE INVENTION A room temperature control method according to the present invention is a room temperature control method for detecting a room temperature to operate a compressor at an operation-on temperature and stopping the compressor at an operation-off temperature. Time and the room temperature change after the compressor operation start delay time has elapsed, and the operation off temperature is obtained from the temperature difference between the set temperature and the room temperature after the operation start delay time has elapsed,
The feature is that the compressor is stopped according to the obtained operation-off temperature.

Further, in the above method, it is possible to infer the degree of coldness or warmth of the room and the feeling of comfort from the room temperature change and the temperature difference by fuzzy inference, and obtain the operation-off temperature from the inference result. preferable.

[0009]

According to the present invention, the operation-off temperature obtained from the change in room temperature between when the compressor is off and after the operation start delay time has elapsed, and the temperature difference between the set temperature and the room temperature after the air-conditioner operation start delay time has elapsed. The compressor is controlled by the method, and the compressor can always be stopped at an appropriate operation-off temperature in consideration of how cold or warm the room is and how comfortable it is. Therefore, in the case of heating operation, when the room is still cold at the beginning of operation, the set off temperature can be set high to prevent the room temperature from dropping significantly after the delay time, and the room warms up. Then, the operation-off temperature can be brought closer to the set temperature according to the degree of warming. Also, in the case of cooling operation, if the heat is still trapped inside the room at the beginning of operation, the set off temperature can be set low to prevent the room temperature from suddenly rising after the delay time, and the room becomes cool. It is possible to bring the operation-off temperature closer to the set temperature according to the degree of cooling.

Therefore, according to the present invention, the room temperature can be kept at a comfortable temperature immediately after the start of operation, and the comfort feeling is improved. Further, the room temperature can be quickly brought close to the set temperature, and the room temperature can be quickly stabilized.

[0011]

1 is a schematic configuration diagram showing an air conditioner A according to an embodiment of the present invention. The air conditioner A includes an indoor unit 1 and an outdoor unit 2. Inside the outdoor unit 2, the four-way valve 3
The outdoor heat exchanger 4, the capillary tube 5, and the check valve 6 and the capillary tube 7 connected in parallel are connected to form a heat medium circulation circuit 8. A sub-circuit 11 including an accumulator 9 and a compressor 10 is connected to another inflow port and outflow port of the four-way valve 3. 12
Is a blower fan. A suction port 16 is provided inside the indoor unit 1.
A room temperature sensor 13 and an indoor heat exchanger 14 are disposed so as to face each other, and the indoor heat exchanger 14 is connected to the heat medium circulation circuit 8 of the outdoor unit 2. In addition, 15 is the air that is sucked from the suction port 16 and exchanges heat with the indoor heat exchanger 14,
A blower fan for forcibly blowing out from 7 and a drain pan 18 for receiving and discharging water drops falling from the indoor heat exchanger 14.

During the cooling operation, the flow direction of the four-way valve 3 is switched to the direction shown by the broken line in FIG. 1, and the indoor cooling is performed by the same operation as a general cooling device. That is, during the cooling operation, the heat medium (refrigerant) circulates in the direction shown by the broken line arrow in FIG. 1, and the compressor 10 and the capillary tube 5
The heat medium in the section on the outdoor heat exchanger 4 side is condensed by the compressor 10 and the heat of condensation of the heat medium is blown by the blower fan 12.
Is discharged from the outdoor heat exchanger 4 to the outside. The condensed heat medium is passed through the capillary tube 5 and the check valve 6 and circulated to the indoor heat exchanger 14 to generate the indoor heat exchanger 1.
When the thermodynamic cycle of vaporization on the 4th side is repeated, the heat medium that has passed through the capillary tube 5 expands and vaporizes on the indoor heat exchanger 14 side, and when the heat medium vaporizes, it deprives the surrounding heat as vaporization heat. . Therefore, the air sucked into the indoor unit 1 from the suction port 16 of the indoor unit 1 is cooled by exchanging heat with the indoor heat exchanger 14, and the blower fan 15 blows cold air into the room from the outlet 17 of the indoor unit 1. Then, the room is cooled.

During the heating operation, the flow direction of the four-way valve 3 is switched to the direction shown by the solid line in FIG. 1, and the functions of the indoor heat exchanger 14 and the outdoor heat exchanger 4 are opposite to those in the cooling operation. That is, during the heating operation, the heat medium circulates in the direction of the solid line arrow in FIG. 1, and the heat medium in the section on the indoor heat exchanger 14 side between the compressor 10 and the capillary tube 7 is condensed by the compressor 10 and the heat of condensation is condensed. Occur. Suction port 1 of indoor unit 1
The air sucked from 6 is heated by exchanging heat with the heat medium by the indoor heat exchanger 14, and the blower fan 15 blows out warm air from the air outlet 17 to heat the room.
On the other hand, the condensed heat medium is stored in two capillary tubes 7,
It passes through 5 and circulates to the outdoor heat exchanger 4 side, and expands and vaporizes on the outdoor heat exchanger 4 side. The vaporized heat medium exchanges heat with the outside air in the outdoor heat exchanger 4, absorbs heat, and returns to the compressor 10 again.

The check valve 6 and the capillary tube 7 are connected in parallel in the heat medium circulation circuit 8 according to the difference in the compression ratio of the heat medium during the cooling operation and the heating operation. This is because the capillary tube 5 at one location separates the compression side and the expansion side during the cooling operation, and the capillary tubes 5 and 7 at two locations separate the compression side and the expansion side during the heating operation.

Next, a method for controlling room temperature in the air conditioner A will be described. The compressor 10 rotates at a constant rotation speed during operation, and the room temperature Tr is equal to the operation ON temperature T _ON.
Then, the operation is started, and when the operation-off temperature T _OFF is _reached , the operation is stopped. The room temperature controller (not shown) controls the room temperature Tr.
_{Becomes the} operation-off temperature T _OFF and the compressor 10 is stopped until a certain delay time Td elapses, and then an appropriate operation-off temperature T _OFF is obtained to correct the operation-off temperature T _{OFF up} to that point. , then use the corrected operating off temperature T _oFF to determine whether the room temperature Tr has reached operating off temperature T _oFF. In this way, the room temperature Tr is adjusted to the vicinity of the set temperature Ts by fuzzyly controlling the operation and stop of the compressor 10 while always correcting the operation-off temperature T _OFF . The room temperature control method will be described in detail below.

First, the room temperature control unit sets the set temperature Ts set by the control panel and the like, the room temperature Tra when the compressor is stopped, detected by the room temperature sensor 13, and the room temperature Trb when the delay time Td elapses after the compressor is stopped. take in. Next, the room temperature Tra when the compressor is stopped and the room temperature Trb when the delay time Td elapses.
Room temperature change ΔTr = Tra−Trb ... At the same time, a temperature difference ΔTs = Ts−Trb ... Between the set temperature Ts and the room temperature Trb when the delay time Td has elapsed is obtained.

Next, the room temperature change fuzzy data is obtained with reference to the membership function of FIG. In FIG. 2, the horizontal axis represents the room temperature change ΔTr defined by the formula, and the vertical axis represents the grade of the fuzzy variable.
The fuzzy variable indicating "no Tr", SM is "room temperature change ΔTr
Is a fuzzy variable indicating that “room temperature change ΔTr is slightly large”, and BG is a fuzzy variable indicating that room temperature change ΔTr is large. Therefore, referring to the membership functions in FIG. 2, the fuzzy variables ZO and S in the room temperature change ΔTr
Each grade of M, MD and BG can be obtained. Further, the temperature difference fuzzy data is obtained by referring to the membership function of FIG. In FIG. 3, the horizontal axis represents the temperature difference ΔTs defined by the formula, the vertical axis represents the grade of the fuzzy variable, N is the fuzzy variable indicating that the temperature difference ΔTs is negative, and Z is the temperature difference. A fuzzy variable indicating “no ΔTs”, M is a fuzzy variable indicating “temperature difference ΔTs is positive and small”, and B is a fuzzy variable indicating “temperature difference ΔTs is positive and large”. Therefore, by referring to the membership functions of FIG. 3, the grades of the fuzzy variables N, Z, M, B at the temperature difference ΔTs can be obtained.

For example, if the set temperature Ts = 23 ° C., the room temperature Tra when the compressor is stopped Tra = 23.7 ° C., and the room temperature Trb when the delay time Td elapses Trb = 20.55 ° C., the room temperature change ΔTr =
Since it is 3.15 ° C., referring to the membership function of FIG. 2, the grade values of each fuzzy variable are ZO = 0, SM = 0, MD = 1.0, BG = 0. On the other hand, since the temperature difference ΔTs = 2.45 ° C. from the formula, referring to the membership function of FIG. 3, the grade values of each fuzzy variable are N = 0, Z = 0, M = 0.5, B = 0.5.

Next, the room temperature control unit refers to the 16 control rules R1 to R16 shown in Table 1 to obtain the output membership value from the room temperature change fuzzy data and the temperature difference fuzzy data calculated as described above. Ask.

[0020]

[Table 1]

The output membership function relating to the correction of the operation-off temperature T _OFF has four fuzzy variables ZOv, S.
It has Mv, MDv, and BGv, and ZOv is "operation-off temperature T
Fuzzy variable that indicates that the correction amount of _OFF is set to 0, S
Mv is "operating off temperature T to reduce the correction amount of _OFF" fuzzy variable indicating that, MDV are fuzzy variable indicating that "somewhat to increase the correction amount of the driver-off temperature T _OFF", BG
v is a fuzzy variable indicating “to increase the correction amount of the operation-off temperature T _OFF ”, and the correction amount G as shown in FIG. 4, for example, is assigned. The control rules (fuzzy rules) in Table 1 are from R1 to R16. For example, rule R1
Is "the fuzzy variable of the room temperature change ΔTr is ZO (there is no room temperature change ΔTr, and the wall, floor, ceiling, etc. of the room are well warmed), and the fuzzy variable of the temperature difference ΔTs is N (the temperature difference ΔTs is negative. If it is hot, the fuzzy variable of the output membership function is set to ZOv (operation off temperature T _OFF
To 0). The rule is
Further, the rule R16 is that “the fuzzy variable of the room temperature change ΔTr is BG (the room temperature change ΔTr is large and the room wall, floor, ceiling, etc. are cold), and the fuzzy variable of the temperature difference ΔTs is B (the temperature difference ΔTs. Is large and feels chilly), set the fuzzy variable of the output membership function to BG
Set to v ( _Increase the correction amount of the operation OFF temperature T _OFF ). The calculated room temperature change fuzzy data and temperature difference fuzzy data are the rules R1 to R1.
How much R16 is satisfied is determined by min operation. That is, as the grade of the output membership value, the grade of the fuzzy variable indicating the room temperature change ΔTr and the temperature difference ΔTs
Takes the smaller of the grades of the fuzzy variables indicating. For example, when the rule of R1 is specifically explained using the above numerical values, the fuzzy variable ZO indicating the room temperature change ΔTr is shown.
Of the fuzzy variable N indicating the temperature difference ΔTs is N = 0, so the grade of the output membership value is ZOv = 0. Also, regarding rule R16, the grade value of the fuzzy variable BG is B
Since G = 0 and the fuzzy variable B grade value is B = 0.5, the output membership value grade is BGv = 0.
Becomes In this way, rules R1 to R16 min
By calculation, the following 16 output membership values are obtained. R1: ZOv = 0 R2: ZOv = 0 R3: SMv = 0 R4: SMv = 0 R5: SMv = 0 R6: SMv = 0 R7: MDv = 0 R8: MDv = 0 R9: MDv = 0 R10: MDv = 0 R11: MDv = 0.5 R12: BGv = 0 R13: MDv = 0 R14: BGv = 0 R15: BGv = 0.5 R16: BGv = 0 Then, the output membership value is calculated max (the same fuzzy variable grade). Find the maximum of the values). For example, if the above 16 output membership values are ZOv, SM
When the max operation is performed for each of v, MDv and BGv, the following output membership composite value, ZOvm = 0 SMvm = 0 MDvm = 0.5 BGvm = 0.5, is obtained. The combined value thus obtained by the min-max calculation is subjected to a one-point calculation (weighted average). That is,
The correction amount G is calculated according to the following equation.

[0022]

[Equation 1]

The weighting coefficient in the one-point calculation formula (formula) is predetermined, for example, a = 0, b = 4, c = 8, d = 12. Therefore, when the above value is used as the output membership value, the correction amount G becomes G = 10.

As described above, the correction amount G = 10 obtained by the fuzzy inference is used by using the table of Table 2 as the operation off temperature T _OFF
When converted to the correction amount ΔT _OFF of, ΔT _OFF = 4.0 ° C. Since the original operation-off temperature T _OFF was 23.7 ° C,
The new operation-off temperature T _OFF becomes 27.7 ° C.

[0025]

[Table 2]

In the above description, the operation-off temperature T _OFF is corrected by setting the set temperature Ts constant, but the operation-off temperature T _OFF is set as a value obtained by adding a constant temperature to the set temperature Ts and set as described above. The same applies when the correction amount of the temperature Ts is calculated and the set temperature Ts is corrected.

FIGS. 5 (a) and 5 (b) show changes in the room temperature Tr controlled by the method of the present invention and the operation of the compressor 10,
It is a figure which shows a stopped state. The fuzzy variables ZO, SM, MD and BG representing the room temperature change ΔTr described above reach the operation-off temperature T _OFF and the room temperature change ΔTr after the compressor 10 is stopped.
Is used to fuzzyly infer the degree of warming of the wall, floor, ceiling, etc. of the room in which the indoor unit 1 is installed, and the temperature difference ΔT
The fuzzy variables N, Z, M, and B representing s are for fuzzy inferring the comfort of the room from the temperature difference ΔTs between the room temperature Trb and the set temperature Ts when the delay time Td elapses. The room temperature is adjusted as shown in FIG. 5A while considering the warmth and comfort of the room. That is, when the room immediately after the air conditioner A is turned on is not sufficiently warmed, the operation off temperature T _OFF is set high to prevent the room temperature Tr from becoming so low as to feel chilly after the delay time Td elapses. If the room temperature does not drop significantly after the delay time Td elapses as the room warms up, the operation-off temperature T gradually increases while considering the comfort.
Turn _OFF to a low value, and finally turn off at a constant operating temperature T
_{When turned off} , the compressor 10 can be stopped. Therefore, even when the room temperature is lowered, the room temperature Tr does not drop largely compared to the set temperature Ts, and comfortable heating can be performed from the beginning of the heating of the air conditioner A. Also, room temperature T
It is possible to quickly stabilize r near the set temperature Ts. On the other hand, since the operation-off temperature T _OFF is set high at the beginning, the room temperature Tr is overshooted and becomes high at the operation-off temperature T _OFF , but if the room walls, floor, ceiling, etc. are cooled, radiation occurs. Even if the air temperature is high, it does not feel hot, so it does not cause any discomfort.

In the above description, the heating operation is described, but the room temperature Tr can be adjusted similarly in the cooling operation. In the case of cooling operation,
Since the operation ON temperature T _ON is set to the set temperature Ts or a temperature slightly higher than the set temperature Ts, and the operation OFF temperature T _OFF is set to a temperature lower than the set temperature Ts, the warming condition in the room is initially set. In consideration of the above, the set temperature Ts is set to a low value, and the operation off temperature T _OFF is gradually increased while fuzzy inferring the indoor comfort, and finally the original operation off temperature T _OFF is stabilized. It is good to do so.

[0029]

According to the present invention, the compressor can always be stopped at an appropriate operation-off temperature while taking into consideration the degree of cooling and warming in the room and the feeling of comfort. The temperature can be maintained at a high temperature, and comfort is improved. Further, the room temperature can be quickly brought close to the set temperature, and the room temperature can be quickly stabilized.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an air conditioner according to an embodiment of the present invention.

FIG. 2 is a diagram showing a membership function that expresses a change in room temperature when the operation is off and after a delay time has elapsed.

FIG. 3 is a diagram showing a membership function expressing a temperature difference between a set temperature and a room temperature after a delay time has elapsed.

FIG. 4 is a diagram showing an output membership function.

FIG. 5 is a diagram showing a control operation during heating operation,
(A) is a figure which shows the change of room temperature, (b) is a figure which shows the control state of a compressor.

6A and 6B are diagrams showing a control operation during heating operation in a conventional example, wherein FIG. 6A is a diagram showing a change in room temperature, and FIG. 6B is a diagram showing a control state of a compressor.

[Explanation of symbols]

 1 Indoor unit 2 Outdoor unit 4 Outdoor heat exchanger 10 Compressor 13 Room temperature sensor 14 Indoor heat exchanger

Claims (2)

[Claims] 1. A room temperature control method for detecting a room temperature, operating a compressor at an operation-on temperature, and stopping a compressor at an operation-off temperature, wherein the room temperature is at the time of operation off and after a lapse of a compressor operation start delay time. A method for controlling room temperature, characterized in that the operation off temperature is obtained from a change and a temperature difference between a set temperature and a room temperature after the operation start delay time has elapsed, and the compressor is stopped according to the obtained operation off temperature. . 2. The fuzzy inference is used to infer the degree of cooling and warming in the room and the feeling of comfort from the room temperature change and the temperature difference, and the operation-off temperature is obtained from the inference result. 1. The room temperature control method according to 1.