JPH109639A - Control method for air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a comfortableness upon restart by operating the frequency of of power supplied to a driving motor according to a prescribed correction setting value when the rotating speed of an indoor fan is a prescribed value or lower, holding the correction setting value during the stop of operation and starting according to the correction setting value at the restart. SOLUTION: In the heating operation mode of an air conditioner, setting temperature externally set is taken as Tsc, and inlet temperature is taken as Ta. At time t1 when these temperatures are approximately equal to each other, a prescribed correction value is added to the setting temperature Tsc to obtain a corrected setting value Tsc' so as to operate the air conditioner on the basis of the corrected setting value Tsc'. Then, at time t2, the correction value is added again to the value Tsc' to obtain a further larger corrected setting value Tsc'' so as to operate the air conditioner on the basis of the further larger corrected setting value Tsc''. At time t3, when an operation stop command is given, the heating operation is stopped at this time. However, at this time, the corrected setting value Tsc is not cancelled. At the time t3, a timer operation is started by a timer. At time t4 when setting time tx terminates, the corrected setting value Tsc'' is cancelled so that the setting temperature Tsc is restored.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to air for correcting a set value of an indoor temperature in order to prevent discomfort caused by a decrease in the temperature of air blown from an indoor unit when a load is light in a heating operation mode. The present invention relates to a method for controlling a harmonic machine.

[0002]

2. Description of the Related Art When an air conditioner is operated in a heating mode, an indoor fan is started at a low rotation speed so that cold air that has not been sufficiently exchanged heat is not blown out at startup. Let it. Then, as the temperature of the indoor heat exchanger increases, the rotation speed of the indoor fan is increased. Next, when the room temperature approaches a set temperature (hereinafter, also referred to as a room temperature set value), an operation of reducing the rotation speed of the indoor fan is performed.

On the other hand, when the room temperature approaches the set temperature,
The frequency of the electric power supplied to the compressor drive motor (hereinafter simply referred to as the compressor frequency) is also reduced, and the temperature of the indoor heat exchanger is also reduced accordingly. At this time, the degree of comfort and the degree of warm air reaching the floor surface change depending on the relationship between the rotation speed of the indoor fan and the temperature of the indoor heat exchanger. That is, when the rotation speed of the indoor fan is low and the temperature of the indoor heat exchanger is high, a short circuit phenomenon occurs in which the hot air does not reach the floor, and conversely, the rotation speed of the indoor fan is high and the indoor heat exchanger If the temperature is low, the user will feel cold. FIG. 8 is a schematic configuration diagram of a control system of a conventional air conditioner for preventing these phenomena. In the figure, room temperature setting value T _sc of room temperature setting device 10 is compared with the room temperature detected value T _a,
The first controller 11 operates the compressor frequency Hz of the air conditioner / environment 13 including the compressor and the indoor fan so that the difference approaches zero, and the second controller 12 controls the indoor heat exchange. The rotation speed rpm of the indoor fan of the air conditioner / environment 13 is controlled according to the unit temperature _Tc, and the rotation speed r of the indoor fan.
When pm drops below a predetermined value, the temperature setting value T _sc that is set, the setting input of the correction set value in addition over one or more times a predetermined correction value [Delta] T _sc first controller 11 And

As described above, when the user gives a command to stop the operation during the operation of the compressor frequency in accordance with the correction set value, the microprocessor for controlling the compressor frequency and the number of rotations of the indoor fan is controlled by the microprocessor shown in FIG. As shown in (1), the heating operation is stopped in Step 101, and immediately after that, Step 102
Has cleared the rise of the set value. When the rise is cleared in this way, when the operation command is given by the user in a short time thereafter, the compressor cannot be started until the temperature of the suction port of the indoor unit falls below the set room temperature, That is, a phenomenon in which the thermostat does not start occurs.

FIG. 10 is a time chart for explaining this. In the figure, a set temperature which is externally set T _sc, the indoor unit intake air temperature (hereinafter, also referred to simply as the suction temperature) and T _a, at time t ₁ in which these temperatures are substantially coincident, the microprocessor itself Is the set temperature T
_The operation is performed according to a correction set value T _sc ′ obtained by adding a fixed correction value to _sc , and at time t _{2, the} correction value is added again and the operation is performed according to another larger correction set value T _sc ″. When the operation stop command is given at time t ₃ in operation, to clear the temperature rise at this time t _3. Thus, T _a> T _sc between the temperature T _a suction and the set temperature T _sc
Will be the state continues for some time, until the time t ₄ when becomes T _a ≦ _sc can not start the compressor, even gave operation command during the period from the time t ₃ to t _4, room temperature control However, there was a problem that comfort was lost due to delay.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and even if the operation according to the correction set value is stopped, the compressor can be operated immediately upon restart, thereby improving comfort. An object of the present invention is to provide a control method of an air conditioner that can be maintained.

[0007]

According to the present invention, when the number of revolutions of the indoor fan falls below a predetermined value in a heating operation mode, a predetermined correction value is added to the externally set indoor temperature set value by one. According to the correction set value applied over or over multiple times,
At least when operating the compressor frequency, if the operation is stopped during the operation based on the correction set value, the correction set value is retained, and a re-operation instruction is issued before a predetermined time has elapsed since the stop of the operation, and When the set values of the operation mode and the room temperature during operation are the same as those at the time of operation stop, the compressor is restarted as it is according to the correction set value, so that the compressor can be operated immediately at the time of restart. Comfort can be maintained.

In this case, when the operation is stopped, a timer for measuring the operation stop time is started, and when the time measured by the timer matches the predetermined time, the holding of the correction set value is released. In addition, it is possible to cope with an operation stoppage for a long time.

In addition, a temperature decrease on the suction side of the indoor unit after the operation is stopped is detected, and when the temperature decrease coincides with the correction value for one time, the correction set value is reduced by the correction value for the one time. Thus, there is an advantage that the correction set value that matches the load condition in which the room temperature slowly changes can be maintained.

[0010] Further, the temperature of the suction side of the indoor unit after the operation is stopped is detected, and when the detected temperature is equal to or lower than the set value of the externally set indoor temperature, the holding of the correction set value is released, so that the room temperature is reduced. It is possible to set a temperature that matches a load condition that changes rapidly.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on preferred embodiments shown in the drawings.

FIG. 1 shows a first embodiment of the present invention by a processing procedure of a microprocessor constituting a control device of an air conditioner. The processing up to the operation of the compressor frequency according to the correction set value is the same as that of the conventional example, and thus the description thereof is omitted, and the processing after the stop of the operation based on the correction set value is shown. That is, when the heating operation is stopped by the operation stop command in step 201, the next step 20
2 Start the timer. And the next step 203
In, it is determined whether a preset time t _x the timer expires, when it is determined that the expiration clears the rise due to correction at step 204. That is, the holding of the correction set value is released.

FIG. 2 is a time chart showing this relationship. In the figure, the externally set temperature is T _sc ,
Suction temperature and T _a, at time t ₁ that these temperatures are substantially coincident, and operated in accordance with the correction set value T _sc 'obtained plus a constant correction value the microprocessor itself to the set temperature T _sc, and plus again correction value at time t ₂ is operated in accordance with another stage larger correction set value T _sc ", the operation stop command is given at time t ₃ during its operation heating operation at this time is stopped However, even if the heating operation is stopped, the correction set value T _sc ″ is not released, and the timer operation starts at time t ₃ , and the set time t _x expires at time t 3. finally corrected set value T _sc "is released at _4, to return to the set temperature T _sc which is externally set. Thus, as shown in FIG. 3, the previous time t _r to the timer set time t _x has expired at even if you restart, I to T _a <T _sc " And for that, the operation of the compressor is started immediately. As the timer set time t _x, various load conditions, for example, assuming the conditions that the suction temperature T _a is not reduced easily, properly defined.

Thus, according to the first embodiment, the correction set value is not cleared immediately after the operation is stopped, and is maintained until the set time of the timer elapses. An air conditioner that can maintain the performance can be provided.

FIG. 4 shows a second embodiment of the present invention by a processing procedure of a microprocessor constituting a control device of an air conditioner. The processing up to the operation of the compressor frequency according to the correction set value is the same as that of the conventional example, and thus the description thereof is omitted, and the processing after the stop of the operation based on the correction set value is shown. That is, if the heating operation is stopped by the operation stop command in step 301, the next step 30
The value of the counter for counting the falling number for correction set value 2 is set to 1, followed by detecting the temperature T _a suction at step 303. In step 304, the difference [Delta] T _a of the suction temperature T _a and the current temperature detected at the time of setting the value of the counter 1, the one time for setting the temperature correction value _{ΔT sc (T sc '-T sc} , T _sc ″ −T _sc ′), and when the condition ΔT _a > ΔT _sc is satisfied, that is,
When the detected temperature has decreased by one correction value of the set temperature, the rise of the correction set value is cleared in step 305,
Further, in step 306, it is determined whether or not the number of times ΔT _sc (m) of clearing the increase and returning to a decrease matches the number of times ΔT _sc (n) of increasing the set value T _sc by the correction value ΔT _sc . If they match, the process is terminated in step 307. If they do not match, the value of the counter for counting the number of drops is incremented by 1 in step 308, and the process of step 303 is performed in order to perform the second clear operation. Move on.

FIG. 5 is a time chart showing this relationship. In the figure, the set temperature T _sc and at time t ₁ when the suction temperature T _a is substantially matched, set the microprocessor itself temperature T _sc a constant correction value [Delta] T _sc a plus corrected set value obtained T _The operation is performed according to _sc ′, and at time t _{2, the} correction value is added again, and the correction set value T _sc ″, which is one step larger, is added.
Operated in accordance with, given operation stop command at time t ₃ during its operation, the heating operation is stopped at this point. The detection of the intake temperature T _a starts when the correction set value at the first time t ₄ when the variation [Delta] T _a of the detected value coincides with the correction value [Delta] T _sc is decreased by [Delta] T _sc, further, the time t ₄ with respect to the suction temperature T _a of the change amount ΔT
_a is only [Delta] T _sc reducing the correction set value at the time t ₅ that is consistent with the correction value [Delta] T _sc. In this case, since the number of increase corrections for the room temperature set value _Tsc is two, _ΔTsc (n = 2), and _ΔTsc (m = 2) for which the number of decrease corrections for the correction set value _Tsc ″ is two Is reached, the original set value T
Return to _sc .

Thus, according to the second embodiment, since the correction set value is not cleared immediately after the operation is stopped, the operation of the compressor is started immediately upon restarting, and the air conditioner can maintain the comfort. Can be provided. Further, since a decrease in the suction temperature is detected and a decrease correction for the correction set value is performed as needed, the correction set value that matches the load condition in which the room temperature changes slowly can be maintained.

FIG. 6 shows a third embodiment of the present invention by a processing procedure of a microprocessor constituting a control device of an air conditioner. The processing up to the operation of the compressor frequency according to the correction set value is the same as that of the conventional example, and thus the description thereof is omitted, and the processing after the stop of the operation based on the correction set value is shown. That is, if the heating operation is stopped by the operation stop command in step 401, the next step 40
Detecting the temperature T _a suction 2. And step 403
So when the operation is stopped, i.e., a change in [Delta] T _a from the detection start time of the suction temperature T _a, compared with the total value [Delta] T _SCT a correction value for the set temperature T _sc, ΔT _a> ΔT scT conditions met When this is done, that is, when the detected temperature drops by the correction value of the set temperature, the correction of the set value is cleared in step 404. If at step 403, ΔT _a ≦ Δ
If it is determined that it is _TscT , the process _proceeds to step 402.

FIG. 7 is a time chart showing this relationship. In the figure, the set temperature T _sc and at time t ₁ when the suction temperature T _a is substantially matched, set the microprocessor itself temperature T _sc a constant correction value [Delta] T _sc a plus corrected set value obtained T _The operation is performed according to _sc ′, and at time t _{2, the} correction value is added again, and the correction set value T _sc ″, which is one step larger, is added.
Operated in accordance with, given operation stop command at time t ₃ during its operation, the heating operation is stopped at this point. Starts the detection of the suction temperature T _a at this time, sequentially calculates the change amount [Delta] T _a from the detection starting point.
The shutdown, the suction temperature T _a in accordance with the load condition, for example, immediately or drop according to curve A, or, or slowly drop according to curve B. If the suction temperature T _a is rapidly drop according to curve A, for room temperature set value at the time t ₄ when the variation [Delta] T _a detected temperature is equal to the sum [Delta] T _SCT a correction value for the set temperature T _sc It cancels the compensation state, when the suction temperature T _a is slowly lowered in accordance with curve B, change in the detected temperature min Δ
At time t ₅ to T _a is equal to the sum [Delta] T _SCT a correction value for the set temperature T _sc releases the correct state for the room temperature setpoint.

Thus, according to the third embodiment, since the correction set value is not cleared immediately after the operation is stopped, the operation of the compressor is started immediately upon restarting, and the air conditioner can maintain the comfort. Can be provided. Also, when a drop in the suction temperature is detected and the change matches the total value of the correction values for the set temperature, the correction state for the set value is released. Can be set.

In each of the above embodiments, the case where only the compressor frequency is operated in accordance with the correction set value of the room temperature has been described. However, the present invention is not limited to this application. The present invention can also be applied to an air conditioner having a control system for performing a correction operation of the indoor fan speed.

In each of the above embodiments, when the set value or the correction set value of the room temperature is substantially equal to the suction temperature, the set value is increased by a predetermined value, but the difference is predetermined. The present invention is also applicable to control for correcting the rise when the value becomes a value.

[0023]

As is apparent from the above description, according to the present invention, when the rotation speed of the indoor fan falls below a predetermined value in the heating operation mode, at least the compressor frequency is adjusted according to the correction set value. If operation is stopped during operation,
When the set value is retained and the operation is restarted before the predetermined time has elapsed since the operation was stopped, and the set values of the operation mode and the room temperature at the time of the restart are the same as those at the time of the operation stop, the correction set value remains unchanged. Since the operation is restarted, the compressor can be operated immediately upon restarting, and the comfort can be maintained.

In this case, when the operation is stopped, a timer for measuring the operation stop time is started, and when the time measured by the timer coincides with a predetermined time, the holding of the correction set value is released. It is possible to cope with the shutdown for a long time.

Further, a temperature drop on the suction side of the indoor unit after the operation is stopped is detected, and when this temperature drop coincides with the correction value for one time, the correction set value is lowered by the correction value, thereby reducing the room temperature. There is an advantage that the correction set value matching the load condition that slowly changes can be maintained.

Also, the temperature of the suction side of the indoor unit after the operation is stopped is detected, and when the detected temperature is equal to or lower than the externally set indoor temperature set value, the holding of the correction set value is released, whereby the room temperature is reduced. It is possible to set a temperature that matches a load condition that changes rapidly.

[Brief description of the drawings]

FIG. 1 is a flowchart showing a first embodiment of the present invention in a processing procedure of a microprocessor constituting a control device of an air conditioner.

FIG. 2 is a time chart showing a relationship between a room temperature and a correction set value according to the first embodiment shown in FIG. 1;

FIG. 3 is a time chart showing a relationship between a room temperature and a correction set value according to the first embodiment shown in FIG. 1;

FIG. 4 is a flowchart illustrating a second embodiment of the present invention in a processing procedure of a microprocessor included in the control device of the air conditioner.

FIG. 5 is a time chart showing a relationship between a room temperature and a correction set value according to the second embodiment shown in FIG. 4;

FIG. 6 is a flowchart illustrating a third embodiment of the present invention in a processing procedure of a microprocessor included in the control device of the air conditioner.

FIG. 7 is a time chart showing a relationship between an indoor temperature and a correction set value according to the third embodiment shown in FIG. 6;

FIG. 8 is a block diagram showing a control system of an air conditioner employing a conventional control method.

9 is a flowchart showing a processing procedure of a microprocessor constituting a control system of the conventional air conditioner shown in FIG.

10 is a time chart showing the relationship between the room temperature and the correction set value of the control system of the conventional air conditioner shown in FIG.

[Explanation of symbols]

 10 room temperature setting device 11 first controller 12 second controller 13 air conditioner / environment

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kazuhiko Akiyama 336 Tatehara, Fuji City, Shizuoka Prefecture Toshiba Fuji Plant

Claims (4)

[Claims] A control of an air conditioner in which the temperature of an indoor air-conditioned room and the temperature of an indoor heat exchanger are controlled variables, respectively, and the frequency of electric power supplied to a compressor drive motor and the number of rotations of an indoor fan are controlled variables. In the method, when the number of revolutions of the indoor fan falls below a predetermined value in the heating operation mode, a predetermined correction value is added to the externally set indoor temperature set value one or more times. According to the correction set value, at least the frequency of the electric power supplied to the drive motor is operated. When the operation is stopped during the operation according to the correction set value, the correction set value is held, and a predetermined time has elapsed since the operation was stopped. Re-operating before elapse, and when the set values of the operation mode and the room temperature at the time of the re-operation are the same as those at the time of the operation stop, restart the operation according to the correction set value, air. Harmonizer control method. 2. When the operation is stopped, a timer for measuring the time from the operation stop is started, and when the time measured by the timer matches the predetermined time, the holding of the correction set value is released. The method for controlling an air conditioner according to claim 1, wherein: And detecting a temperature drop on the suction side of the indoor unit after the operation is stopped, and decreasing the correction set value by the correction value each time the temperature drop matches the correction value for one time. The method for controlling an air conditioner according to claim 1, wherein: 4. The method according to claim 1, further comprising detecting a temperature of the suction side of the indoor unit after the operation is stopped, and releasing the holding of the correction set value when the detected temperature is equal to or less than an externally set indoor temperature set value. The method for controlling an air conditioner according to claim 1.