JP3463694B2 - Room temperature controller for air conditioner - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control system for an air conditioner.

[0002]

2. Description of the Related Art FIG. 8 is an electric circuit diagram for determining a set value based on a conventional outside air temperature as shown in Japanese Utility Model Laid-Open No. 59-124938. In the figure, 1 is a power switch, 2 is a thermistor or a similar temperature detector for detecting a room temperature, 3 is a thermistor or a similar temperature detector for detecting an outside air temperature, Reference numerals 4 and 5 are A / D converters, 6 is a switch section for operating modes, etc., 7 is a microcomputer as a heating / cooling capacity calculating means having a cooling / heating capacity setting / changing means, an input circuit 8, a CPU 9 and a target set value. It has a table 10 and an output circuit 11 for determining. The cooling / heating capacity variable device 12 controls a drive system such as a compressor based on the data input from the output circuit 11.

Next, the operation will be described with reference to the flowchart of FIG. First, when the power supply 1 is turned on, this flowchart starts. In step 101, the outdoor temperature is input, in step 102, the set target value is determined from the correlation table between the outdoor temperature and the set target value as shown in FIG.
At 04, the difference between the set target value and the room temperature at that time is calculated, and the drive system such as the compressor is controlled.

[0004]

In the control method described above, if the outside air temperature cannot be detected accurately due to bad installation conditions of the outdoor unit or the influence of the outside wind, etc. May be set.

Further, in the above-mentioned control method, since the control is performed based on the target set value determined even when the power consumption in summer reaches a peak, the reduction of the power consumption should be actively promoted. I can't.

Further, when the outside temperature is low during the heating operation, the evaporator is frosted and the capacity is deteriorated. Therefore, it is necessary to prevent the capacity deterioration in advance.

An object of the present invention is to determine a correct target set value by correcting the detected outside air temperature when it is judged that the outside air temperature is not accurately detected due to the installation condition of the outdoor unit and the outside wind.

Also, the outside air temperature during cooling operation is very high,
Moreover, when it can be determined that the outside air temperature has reached the peak of the day, the target set value is automatically increased and the variable stimulus control is performed, so that the same comfort is ensured and the power consumption is suppressed. To do.

Further, during the heating operation, when the outside air temperature is low, the evaporator is frosted and the capacity is deteriorated. Therefore, it is another object to prevent the capacity from being deteriorated. Further, when the outside air temperature during the cooling operation is very high and it can be determined that the outside air temperature has reached the peak of one day, it is another object to suppress the power consumption by the small capacity operation.

[0010]

A room temperature control device for an air conditioner according to the present invention includes an outdoor temperature detecting means for detecting an outdoor temperature and a temperature change of the outdoor temperature detected by the outdoor temperature detecting means for a certain period of time. Is less than a predetermined value, the target indoor temperature is set by the outdoor temperature detected by the outdoor temperature detecting means, and when the temperature change of the outdoor temperature detected by the outdoor temperature detecting means for a certain period exceeds a predetermined value. A heating / cooling capacity control unit that sets a target indoor temperature according to a temperature close to the original outside air temperature and controls the cooling / heating capacity.

Further, the outdoor temperature detecting means for detecting the outdoor temperature, and the outdoor temperature detected by the outdoor temperature detecting means when the temperature change of the outdoor temperature detected by the outdoor temperature detecting means for a predetermined time is less than a predetermined value. When the temperature exceeds a predetermined temperature, the target indoor temperature is set by the outdoor temperature in which the outdoor temperature is corrected, and while the indoor temperature of the cooling operation is rising, when a temperature set value higher than the target indoor temperature by a predetermined value is reached, A cooling / heating capacity control means for performing a large cooling capacity operation and performing a room temperature fluctuation control for switching to a small cooling capacity operation when a low temperature set value which is lower than the target indoor temperature by a predetermined value is reached while the indoor temperature is decreasing. It is a thing.

Further, in the heating operation, when the outdoor temperature detected by the outdoor temperature detecting means falls below a predetermined value, control is performed to increase the speed of the outdoor blowing fan.

[0013]

When the outdoor temperature change for a certain time is less than the predetermined value by the cooling / heating capacity control means, the target indoor temperature is set by the outdoor temperature detected by the outdoor temperature detection means, and when the temperature change exceeds the predetermined value. Controls the heating and cooling capacity by setting the target indoor temperature according to the temperature close to the outside air temperature.

Further, when the change in the outdoor temperature for a certain period of time is less than a predetermined value by the cooling / heating capacity control means and the outdoor temperature detected by the outdoor temperature detecting means exceeds the predetermined temperature,
The target indoor temperature is set by the outdoor temperature in which the outdoor temperature is corrected, and the room temperature fluctuation control is performed to change the room temperature between the high temperature setting value and the low temperature setting value near the target indoor temperature.

Further, when the outdoor temperature detected by the outdoor temperature detecting means during the heating operation falls below a predetermined value, control is performed to increase the speed of the outdoor blowing fan.

[0016]

EXAMPLES Example 1. This embodiment will be described with reference to FIGS. 1, 2, 3 and 4 by taking a cooling operation as an example. FIG. 1 is an electric circuit diagram of this embodiment, in which 1 is a power switch, 2 is a thermistor or similar, a temperature detector for detecting room temperature, 3 is a thermistor or similar, A temperature detector for detecting the temperature, 4, 5 A / D converters, 6 a switch section for operating modes, etc. 7 a microcomputer as a cooling / heating capacity calculating means having a cooling / heating capacity setting / changing means ,
It has an input circuit 8, a calculation control unit (CPU) 9, a setting condition table 10 for determining a target set value, an outside air temperature change storage unit 13 for storing an outside air temperature change, and an output circuit 11. The cooling / heating capacity variable device 12 controls a drive system such as a compressor based on the data input from the output circuit 11.

Next, the operation of the present invention will be described for the cooling operation.
This will be described with reference to the flowchart of FIG. First, when the power switch is turned on, this flowchart starts.
The outside air temperature is detected in step 201, and the outside air temperature T ₁ before the return and the outside air temperature T ₂ after the return are detected in the step 202.
The change value α of the outside air temperature is obtained from Therefore, immediately after the start, there is no outside temperature to compare, so the change value α is 0 de
It becomes g. The amount of change in outside temperature within a certain time cannot be a constant value due to the weather, measurement time, etc., but the amount of change in the natural world does not change extremely unless external factors are added, and within a certain time (for example, The maximum value of the temperature change amount at t ₂ −t ₁ ) can be set to α (for example, α = 4 deg as a change value for 10 minutes) as shown in FIG. Further, in FIG. 3, the alternate long and short dash line represents the upper limit of the normal increase rate of the outside temperature in the natural world, and if the increase rate is higher than that, it is considered that the setting condition of the outdoor unit is strict. If the rate of increase is higher than the one-dot chain line, lower the rate of increase to the one-dot chain line to set the room temperature target value. Here, α and β are the outside air temperature increase rates, and when the increase rate is less than or equal to α (for example, γ), the value obtained by multiplying the outside air temperature before return by γ (variation value) is the outside air temperature at that time. , When the rate of increase is α or more (for example, β), the outside air temperature before the return is α
The value obtained by adding (fixed value) T ₂ = T ₁ + α is the outside air temperature at that time. If the temperature change value is equal to or less than α, it can be determined that the temperature is normally detected without change due to external factors, and the process proceeds to step 203, where the detected outside air temperature is detected by the setting condition table as shown in FIG. Determine the target setpoint for room temperature from. When the temperature change value is larger than α, it is the amount of temperature change within a certain time due to temperature changes due to external factors such as when the outdoor unit installation conditions are severe, or the air that has been heat-exchanged by the outside air is again heat-exchanged. When it can be judged that the temperature has increased, the target value of the room temperature is T ₂ = T ₁ + γ
(Α> γ) In Fig. 4, the target value is constant above 30 ° C because it is better for the health to set the room temperature target value higher in accordance with the increase in the outside temperature.
This is because it is energy saving, but if it is too high, comfort is impaired, and it is known that the upper limit is around 30 ° C. When it can be determined that the temperature is changing due to an external factor, the process proceeds to step 204, and the outside air temperature after the return in the flowchart of FIG. 2 is returned even if the actual temperature change width is β (β> α). The temperature T ₂ is T ₂ = T ₁ +
Although β is obtained, the temperature T ₂ = T ₁ + α obtained by adding α to the outside air temperature T ₁ before the return is set, and the target set value of the room temperature is determined from this outside air temperature by the setting condition table as shown in FIG. In step 205, the temperature of the room temperature is detected, in step 206, the difference between the target set value and the room temperature is obtained, and the driving capacity is determined depending on whether the temperature difference is larger or smaller than a certain value ΔT. When the difference between the target value and the indoor temperature is larger than ΔT, the operation proceeds to step 207, and the high cooling capacity operation is performed. When the difference between the target value and the indoor temperature is smaller than ΔT, the step 20 is executed.
Proceed to step 8 to perform low cooling capacity operation. What is high cooling capacity operation?
The purpose is to bring the room closer to the target set value more quickly, the operating frequency of the compressor is MAX, the inner fan is turned with the Hi notch, and the low cooling capacity operation is for the purpose of maintaining the room temperature at which the target set value is reached. MI the operating frequency of the compressor
N, the inner fan is rotated with the Lo notch.

As described above, the amount of change in the outside air temperature within a certain time does not change extremely in the natural world unless an external factor is added. It can be determined that the system is installed under extremely severe conditions, and in such a case, by correcting to the original outside temperature, it is possible to more accurately set the indoor target temperature setting based on this outside temperature. .

Example 2. This embodiment will be described with reference to FIGS. The electric circuit diagram of this embodiment is the same as that of FIG. FIG. 5 is a flow chart showing the operation of this embodiment. First, when the power is turned on, this flowchart starts. In step 301, the outside temperature is detected,
At step 302, the room temperature is detected. Next step 303
When the first outside air temperature is measured, the routine proceeds to step 304, where the target set value of the room temperature is determined from the outside air temperature according to the conditions shown in FIG. 4, and then the routine proceeds to step 305 to perform steady control. The measured value of the outside air temperature after the second time is T _MAX (for example, 35
℃) and the outside air temperature T ₁ measured before return
When the temperature change value between the outside air temperature T ₂ measured after the return and the return is γ (for example, γ = 2 deg as the change value for 10 minutes), it is determined that the peak value of the outside air temperature of the day is reached,
In step 304, the ambient temperature is corrected from the setting table as shown in FIG. 4 in the same manner as in the first embodiment to determine the target value of room temperature. At step 306, the room temperature Tr is changed to step 304
If it is higher than the high temperature set value Th which is 0.5 to 1.5 deg higher than the target value set in step 1 by 1 deg or more, the same operation as in the normal mode is performed in step 305. This is because comfort is impaired when the variable stimulus control is performed when the room temperature is extremely higher than the set temperature. The variable stimulus control is step 306.
From the flow chart of step 318 to step 318, the maximum cooling capacity and the minimum cooling capacity are switched so that the room temperature changes between the high temperature setting value and the low temperature setting value in the vicinity of the set temperature and without exceeding the maximum rising / falling time. As a result, the set temperature can be raised during cooling, which is economical and at the same time provides a comfortable and comfortable environment compared to the environment where the physiological function of the user and the cerebrum are stimulated and the room temperature is controlled at a constant level. This is obtained, and this operation will be described next. When it has reached the region of less than 1 deg from the high temperature set value Th, the routine proceeds to step 307, where the cooling capacity is judged, and if it is high cooling capacity, it proceeds to step 308, and if it is low cooling capacity, it proceeds to step 314. Since the room temperature is higher than the high temperature set value Th at the initial stage of operation, it is determined in step 307 that the process proceeds to step 308. At step 308, the operating time is integrated, and at step 309, the room temperature Tr is higher than the low temperature set value TL which is 0.5 to 1.5 deg lower than the target value set, and at step 310, the operating time t is less than the constant time t _0. If step 311
And the high cooling capacity operation is performed, and the process returns to step 308. Therefore, when the room temperature Tr is higher than the low temperature set value TL and the operation time t is within a fixed time, the high cooling capacity operation is continued.
When the room temperature Tr is equal to or lower than the low temperature set value TL, in step 309, when the operating time t becomes longer than the fixed time t ₀ , the process branches to step 310, the low cooling capacity is set in step 312, and the integration is performed in step 313. Driving time t
Is reset and the process returns to step 301. Step 3
If the cooling capacity is low in 07, the process proceeds to step 314, and the operating time t is integrated in step 314, and step 315
When the room temperature Tr is lower than the high temperature set value Th and the operation time t is smaller than the constant time t ₀ in step 316, the process proceeds to step 317, the minimum cooling capacity operation is performed, and the process returns to step 314. Therefore, when the room temperature Tr is lower than the high temperature set value Th and the operation time t is within the constant time t ₀ , the low cooling capacity operation is continued. When the room temperature Tr is equal to or lower than the high temperature set value, in step 315, when the operation time t becomes longer than the constant time t ₀ , the process branches to step 316, the high cooling capacity is set in step 318, and the operation is integrated in step 313. Reset time t, step 301
Return to. As a result, the room temperature Tr repeatedly changes between the high temperature set value Th and the low temperature set value TL within a fixed time t ₀ and repeatedly changes.

Next, the characteristics of the operation control during the cooling operation of this embodiment will be described with reference to FIG. When the operation mode is set to the normal mode and the operation of the air conditioner is started at time t ₁ , the room temperature Tr decreases toward the set temperature Ts indicated by the broken line. If the change mode at time t _2, the maximum cooling capacity operation time t _2, is lowered to a low temperature setting value TL.
When the room temperature Tr reaches the low temperature set value TL at time T ₃ , the minimum cooling capacity operation is started and the temperature rises to the high temperature set Th. Time t
_When the room temperature Tr reaches the high temperature set value Th in ₄ , the maximum cooling capacity operation is performed, and the room temperature Tr drops again toward the low temperature set value TL. Also, as at times t ₈ and t ₁₁ , the high temperature set value T
h or a constant time t ₀ even if the low temperature set value TL is not reached
After the time elapses, the cooling capacity is switched and the operation continues. In this way, the maximum value t of the rising / falling time is detected while detecting the room temperature Tr.
_{Since the} maximum cooling capacity and the minimum cooling capacity are repeated without exceeding ₀ , the room temperature Tr changes between the temperature set value Th near the set temperature and the low temperature set value TL and within the maximum rise / fall time.

As described above, the target setting can be set more accurately and the outside air temperature can be set to an extremely high level by correcting the outside air temperature even if the outdoor unit installation conditions are bad and the outside air temperature cannot be detected accurately. By performing variable stimulation control automatically when the peak value is extremely high,
An energy saving effect can be obtained without impairing comfort.

Example 3. This embodiment will be described with reference to FIG. The electric circuit diagram of this embodiment is the same as that of FIG. FIG. 7 is a flowchart showing the operation of this embodiment. Step 4
The ambient temperature is detected at 01, and the target set value is calculated at step 402 by the method as described in the first embodiment. If the outside air temperature entered here is below 7 ° C, increase the fan speed,
It mitigates the decrease in evaporation temperature and prevents the outdoor unit from entering the frosted area. The decrease in the evaporation temperature can be alleviated by increasing the fan speed of the outdoor unit when increasing the fan speed of the outdoor unit in order to obtain the same evaporation capacity. This is because Originally, if the fan speed is raised to the maximum and the evaporation pressure can be kept high, it becomes harder to frost, and the fan speed is maximized from the beginning during heating operation, but frost does not occur even during heating operation (during overload operation). In some cases, the fan speed can be reduced in order to suppress the driving noise.

As described above, the operation noise can be suppressed as much as possible during the normal heating operation, and the fan speed can be increased to suppress the frost formation only when the ambient temperature is below the threshold value when frost formation is likely to occur. Noise can be prevented and heating capacity can be increased more than usual.

[0024]

As described above, according to the present invention, the target set value can be set more accurately by correcting the outside air temperature even if the outdoor unit installation condition is bad and the outside temperature cannot be detected accurately. can do.

Further, during the cooling operation, the variable stimulus control is automatically performed when the outdoor temperature exceeds a predetermined temperature, whereby comfort can be maintained and power consumption can be suppressed.

Further, during the heating operation, the fan speed can be increased to prevent frost formation and the heating capacity to be increased only when the outdoor temperature is equal to or lower than the predetermined temperature.

[Brief description of drawings]

FIG. 1 is an electric circuit diagram of a room temperature controller showing an embodiment of the present invention.

FIG. 2 is a flowchart showing a target set value determining means according to an embodiment of the present invention.

FIG. 3 is a correction graph for obtaining the operation of one embodiment of the present invention.

FIG. 4 is a table for determining setting conditions in an embodiment of the present invention.

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

FIG. 6 is a control characteristic diagram of another embodiment of the present invention.

FIG. 7 is a flowchart showing the operation of another embodiment of the present invention.

FIG. 8 is an electric circuit diagram of a conventional air conditioner.

FIG. 9 is a flowchart showing the operation of a conventional air conditioner.

FIG. 10 is a table for determining setting conditions of a conventional air conditioner

[Explanation of symbols] 1 power switch 2 Indoor temperature detector 3 Outdoor temperature detector 4,5 A / D converter 6 switch 7 microcomputer 12 Variable capacity device

Front page continued (72) Inventor Tatsuya Mochizuki 3-18-1, Oga, Shizuoka City Mitsubishi Electric Co., Ltd. Shizuoka Manufacturing (72) Inventor Yoshifumi Tezuka 3-18-1, Oka, Shizuoka Mitsubishi Electric Corporation Shizuoka Plant (56) Reference JP 55-77657 (JP, A) JP 55-35819 (JP, A) JP 54-150837 (JP, A) JP 50-150259 (JP, A) JP 4-106357 (JP, A) JP 3-213937 (JP, A) JP 55-118546 (JP, A) Actually open 61-41532 (JP, U) Actually open 57 −203234 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F24F 11/02

Claims (3)

(57) [Claims] 1. An outdoor temperature detecting means for detecting an outdoor temperature, and an outdoor temperature detecting means for detecting the outdoor temperature when the temperature change of the outdoor temperature detected by the outdoor temperature detecting means for a predetermined time is less than a predetermined value. The target indoor temperature is set according to the temperature, and the outdoor temperature detected by the outdoor temperature detection means
When the temperature change for a certain period of time exceeds a predetermined value, a cooling / heating capacity control means for setting the target indoor temperature according to the temperature close to the original outside air temperature and controlling the cooling / heating capacity is provided. Room temperature control device for air conditioner. 2. An outdoor temperature detecting means for detecting an outdoor temperature, and an outdoor temperature detected by the outdoor temperature detecting means for which a temperature change of the outdoor temperature detected by the outdoor temperature detecting means for a predetermined time is less than a predetermined value. When the temperature exceeds a predetermined temperature, the target indoor temperature is set by the outdoor temperature in which the outdoor temperature is corrected, and while the indoor temperature of the cooling operation is rising, when a temperature set value higher than the target indoor temperature by a predetermined value is reached, A cooling / heating capacity control means for performing a large cooling capacity operation and performing a room temperature fluctuation control for switching to a small cooling capacity operation when a low temperature set value which is lower than the target indoor temperature by a predetermined value is reached while the indoor temperature is decreasing. A room temperature control device for an air conditioner, which is characterized in that 3. The control for increasing the outdoor fan speed when the outdoor temperature detected by the outdoor temperature detecting means during heating operation falls below a predetermined value. Room temperature control device for air conditioner.