JP3523963B2 - Control method of 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 an air for correcting a set value of an indoor temperature in order to prevent discomfort caused by a decrease in temperature of air blown from an indoor unit when a load is light in a heating operation mode. The present invention relates to a control method for a harmony 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 rotational speed so that cold air that has not been sufficiently exchanged with heat does not blow out at startup. Let Then, as the temperature of the indoor heat exchanger rises, the rotation speed of the indoor fan is increased. Next, when the room temperature approaches the set temperature (hereinafter, also referred to as the room temperature set value), the operation of lowering 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, also simply referred to as the compressor frequency) is also lowered, and the temperature of the indoor heat exchanger is accordingly lowered. At this time, the degree of comfort and how warm air reaches 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 warm air does not reach the floor. On the contrary, the rotation speed of the indoor fan is high and the indoor heat exchanger is If the temperature is low, the user will feel chilly. FIG. 8 is a schematic configuration diagram of a conventional air conditioner control system that prevents 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 expressed by 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 equipment temperature T _c, and the rotation speed r of the indoor fan is also changed.
When pm falls below a predetermined value, a predetermined correction value ΔT _sc is added to the set room temperature set value T _sc once or a plurality of times to input the correction set value to the setting input of the first controller 11. I am trying.

As described above, when the user gives an instruction to stop the operation during the operation of the compressor frequency according to the correction set value, the microprocessor for controlling the compressor frequency and the indoor fan rotation speed is shown in FIG. As shown in step 102, heating operation is stopped in step 101, and immediately after step 102
Had cleared the increase in the set value. When the rising amount is cleared in this way, when a user gives an operation command 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, the phenomenon that the thermo is not activated occurs.

FIG. 10 is a time chart for explaining this. In the figure, the externally set temperature is set to T _sc , the intake air temperature of the indoor unit (hereinafter, also simply referred to as intake temperature) is set to T _a, and at time t ₁ when these temperatures substantially match, the microprocessor itself Is the set temperature T
_The operation is performed according to the correction set value T _sc ′ obtained by adding a constant correction value to _sc , the correction value is added again at time t ₂ , and the operation is performed according to the correction set value T _sc ″ that is one step larger. When an operation stop command is given at time t ₃ during operation, the temperature increase is cleared at this time t _3. Therefore, T _a > T _sc between the set temperature T _sc and the suction temperature T _a.
Therefore, even if the operation command is given from time t ₃ to t ₄ , the compressor cannot be started until time t ₄ where T _a ≦ _sc , and the room temperature control is performed. However, there was a problem that the comfort was impaired due to the delay.

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

[0007]

According to the present invention, when the number of rotations of the indoor fan drops below a predetermined value in the heating operation mode, a predetermined correction value is set to 1 for the set value of the room temperature set externally. According to the correction setting value added once or multiple times,
At least when operating the compressor frequency, if an operation stop occurs during operation with the correction setting value, this correction setting value is held, and a restart command is issued before the lapse of a predetermined time from the operation stop, and When the operating mode and room temperature settings during operation are the same as when the operation was stopped, the compressor is restarted as it is according to the correction settings, so that the compressor can be operated immediately upon restarting. You can maintain comfort.

[0008]

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

Further, when the temperature on the suction side of the indoor unit after the operation is stopped is detected and the detected temperature is equal to or lower than the externally set value of the indoor temperature, the correction setting value is released and the room temperature is lowered. It is possible to set the temperature according to the load condition that changes rapidly.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in detail based on the 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 by the correction set value is the same as in the conventional example, and is therefore omitted, and the processing after the operation stop by 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
Start the timer with 2. And the next step 203
Then, it is determined whether or not the time t _x preset in the timer has expired. When it is determined that the time t _x has expired, in step 204, the increased amount due to the correction is cleared. 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 set to T _sc ,
_{Let the} suction temperature be T _a, and at time t ₁ when these temperatures substantially match, the microprocessor itself _operates according to a corrected set value T _sc ′ obtained by adding a fixed correction value to the set temperature T _sc , At time t _{2, the} correction value is added again, and the operation is performed in accordance with the correction set value T _sc ″ that is one step larger. When the operation stop command is given at time t ₃ during the operation, the heating operation is stopped at this time. However, even if the heating operation is stopped, the correction set value T _sc ″ is not released, and the time counting operation by the timer is started at time t _{3 and} time t _{x at} which the set time t _x expires. _{At 4, the} correction set value T _sc ″ is released, and the set temperature T _sc set externally is restored. As shown in FIG. 3, the time t _r before the set time t _{x of the} timer expires. at even if you restart, I to T _a <T _sc " And for that, the operation of the compressor is started immediately. The timer set time t _x is set appropriately in consideration of various load conditions, for example, a condition in which the suction temperature T _a does not drop easily.

Thus, according to the first embodiment, the correction set value is not cleared immediately after the operation is stopped and is held until the set time of the timer elapses. It is possible to provide an air conditioner that can maintain the property.

FIG. 4 shows the second embodiment of the present invention in the processing procedure of the microprocessor constituting the control device of the air conditioner. The processing up to the operation of the compressor frequency by the correction set value is the same as in the conventional example, and is therefore omitted, and the processing after the operation stop by 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
In 2, the value of the counter that counts the number of lowering with respect to the correction set value is set to 1, and subsequently, in step 303, the suction temperature T _a is detected. 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 of ΔT _a > ΔT _sc is satisfied, that is,
When the detected temperature has decreased by the correction value for one set temperature, the increase in 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 amount of increase and returning to decrease matches the number of times ΔT _sc (n) of increasing correction of the set value T _sc by the correction value ΔT _sc . If they match, the process ends in step 307, and 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 to perform the second clearing operation. Move.

FIG. 5 is a time chart showing this relationship. In the figure, at time t ₁ when the set temperature T _sc and the suction temperature T _a substantially match, the correction set value T obtained by the microprocessor itself adding a constant correction value ΔT _sc to the set temperature T _{sc. The} operation is performed in accordance with _sc ′, and the correction value is added again at time t ₂ to make the correction set value T _sc ″ larger by one step.
It is assumed that the heating operation is stopped at the time when the operation stop command is given at time t ₃ during the operation. At this time point, the detection of the suction temperature T _a is started, and the correction set value is decreased by ΔT _sc at the first time t _{4 when} the change ΔT _{a of the} detected value matches the correction value ΔT _sc , and further, the time t ₄ with respect to the suction temperature T _a of the change amount ΔT
_At time t ₅ when a matches the correction value ΔT _sc , the correction setting value is decreased by ΔT _sc . In this case, since the number of increase corrections for the room temperature set value _Tsc is two, ΔT _sc (n = 2), and the number of decrease corrections for the correction set value T _sc ″ is two ΔT _sc (m = 2). The original setting value T
Return to _sc .

Thus, according to the second embodiment, since the correction setting value is not cleared immediately after the operation is stopped, the operation of the compressor is immediately started when the air conditioner is restarted, and the air conditioner capable of maintaining the comfort. Can be provided. Further, since the decrease change amount of the suction temperature is detected and the decrease correction is performed on the correction set value 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 in a processing procedure of a microprocessor constituting a control device of an air conditioner. The processing up to the operation of the compressor frequency by the correction set value is the same as in the conventional example, and is therefore omitted, and the processing after the operation stop by 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
The suction temperature T _a is detected at 2. And step 403
Then, when the operation is stopped, that is, the change amount ΔT _a from the time when the suction temperature T _a is detected is compared with the total correction value ΔT _scT with respect to the set temperature T _sc , the condition of ΔT _a > ΔT _scT is satisfied. When that is the case, that is, when the detected temperature has decreased by the correction value of the set temperature, the correction amount of the set value is cleared in step 404. If at step 403 ΔT _a ≦ Δ
If it is determined to be T _scT , the process _proceeds to step 402.

FIG. 7 is a time chart showing this relationship. In the figure, at time t ₁ when the set temperature T _sc and the suction temperature T _a substantially match, the correction set value T obtained by the microprocessor itself adding a constant correction value ΔT _sc to the set temperature T _{sc. The} operation is performed in accordance with _sc ′, and the correction value is added again at time t ₂ to make the correction set value T _sc ″ larger by one step.
It is assumed that the heating operation is stopped at the time when the operation stop command is given at time t ₃ during the operation. At this time point, the detection of the suction temperature T _a is started, and the change amount ΔT _a from the detection start time point is sequentially calculated.
Due to the stop of the operation, the suction temperature T _a drops rapidly according to the load condition, for example, according to the curve A, or slowly according to the curve B. If the suction temperature T _a drops rapidly according to the curve A, the detected temperature change ΔT _a corresponds to the room temperature set value at time t ₄ at which the total correction value ΔT _scT for the set temperature T _sc matches. When the correction state is released and the suction temperature T _a drops slowly according to the curve B, the variation Δ in the detected temperature
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 immediately started when the air conditioner is restarted, and the air conditioner capable of maintaining the comfort. Can be provided. Also, when a change in the suction temperature is detected to decrease, and when this change matches the total value of the correction values for the set temperature, the correction state for the set value is released, so load conditions that rapidly change the room temperature It is possible to set the temperature according to.

In each of the above-mentioned embodiments, the case where only the compressor frequency is operated according to the room temperature correction set value has been described, but the present invention is not limited to this, and the compressor frequency is operated, and It can also be applied to an air conditioner having a control system for correcting the indoor fan rotation speed.

In each of the above embodiments, when the set value of room temperature or the corrected set value and the suction temperature become substantially equal, the set value is increased and corrected by a predetermined value, but the difference is predetermined. The present invention can also be applied to control for increasing correction when it reaches a value.

[0023]

As is apparent from the above description, according to the present invention, when the rotation speed of the indoor fan drops below a predetermined value in the heating operation mode, at least the compressor frequency of the compressor frequency is adjusted according to the correction set value. When the operation is stopped during operation,
When the correction setting value is retained and the operation is restarted before the lapse of a predetermined time from the operation stop, and the operation mode and room temperature setting values at the time of restart are the same as when the operation was stopped, the correction setting value remains unchanged. Since the operation is restarted, the compressor can be immediately operated at the time of 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 this timer coincides with a predetermined time, the holding of the correction set value is released. It is possible to cope with the operation stop for a long time.

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

Further, when the temperature of the suction side of the indoor unit after the operation is stopped is detected and the detected temperature is equal to or lower than the set value of the externally set room temperature, the correction set value is released and the room temperature is changed. It is possible to set the temperature according to the load condition that changes rapidly.

[Brief description of 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 an indoor temperature and a correction set value according to the first embodiment shown in FIG.

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

FIG. 4 is a flowchart showing a second embodiment of the present invention in a processing procedure of a microprocessor constituting a control device for an air conditioner.

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

FIG. 6 is a flowchart showing a third embodiment of the present invention in a processing procedure of a microprocessor constituting a control device for an air conditioner.

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

FIG. 8 is a block diagram showing a control system of an air conditioner adopting 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

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kazuhiko Akiyama               336 Tatehara, Fuji City, Shizuoka Prefecture Toshiba Corporation               Inside the Fuji factory                (56) References JP-A-7-198190 (JP, A)                 JP-A-7-332774 (JP, A)                 JP-A-60-129548 (JP, A)                 JP 62-91738 (JP, A)                 JP-A-56-18087 (JP, A)                 JP-A-8-121847 (JP, A)                 JP 62-91736 (JP, A)                 JP-A-8-159567 (JP, A)                 Actual Kaihei 2-147743 (JP, U)

Claims (3)

(57) [Claims] 1. A control of an air conditioner in which an indoor temperature and an indoor heat exchanger temperature for air conditioning are respectively controlled variables, and a frequency of electric power supplied to a compressor driving motor and an indoor fan rotational speed are manipulated variables. In the method, when the number of rotations of the indoor fan drops below a predetermined value in the heating operation mode, a predetermined correction value is added to the set value of the externally set room temperature once or a plurality of times. According to the correction set value, at least the frequency of the electric power supplied to the drive motor is operated, and when the operation is stopped according to the correction set value, the correction set value is held for a predetermined time after the operation is stopped. When the operation mode and the room temperature at the time of restart are the same as when the operation was stopped, the operation is restarted according to the correction set value. Harmonic control method. 2. A temperature decrease on the suction side of an indoor unit after operation stop is detected, and each time the temperature decrease matches the correction value for one time, the correction set value is decreased by the correction value. The method for controlling an air conditioner according to claim 1, wherein: 3. 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. The method for controlling an air conditioner according to claim 1.