JP3075792B2 - Air volume change device 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 an air volume changing device for an air conditioner which automatically reduces the air volume of a blower at night to reduce noise.

[0002]

2. Description of the Related Art The prior art is disclosed in Japanese Patent Laid-Open No. 58-117.
No. 943, for example. What is described in this publication is that in an automatic operation system of an air conditioner that performs a cooling operation and a heating operation by a temperature detector and a control device, a light detector is provided in the control device, and the illuminance of the room is sensed. Detecting a change in illuminance at bedtime and automatically changing the set temperature. "

[0003] With such a configuration, the sleep operation can be automatically performed when the user goes to bed after turning off the light.

[0004]

In the case of using the above-mentioned conventional technology, it is generally known to reduce the amount of air blow during quiet operation to reduce noise, so that a photodetector is provided. When the illuminance detected by the photodetector becomes equal to or less than a predetermined value, it is easily conceivable to reduce the discharge air volume of the conditioned air to reduce the noise of the conditioned room.

[0005] However, it is difficult to set a predetermined value of the illuminance. That is, when outside light is blocked by curtains or the like in the daytime or when it rains in the evening, it is difficult to distinguish between them, and malfunctions occur. There was something.

SUMMARY OF THE INVENTION The present invention relates to an air volume changing device for an air conditioner in which the air volume is not erroneously reduced in the daytime to solve such a problem.

[0007]

According to the present invention, there is provided an air volume control unit for controlling a discharge air volume of conditioned air on the basis of an air volume signal, and a brightness for outputting a signal when the brightness of a conditioned room falls below a predetermined value. A determination unit and a correction unit that performs a correction on the air flow signal to reduce the discharge air flow in response to a signal from the determination unit, and the air flow changing device of the air conditioner that lowers the air flow at night. Clock unit, a storage unit storing a reference time determined based on the sunset time for each month and day, and a reference time corresponding to this month and day read from the storage unit for each month and day measured by the clock unit, and A malfunction prevention unit that invalidates the signal when the time measured by the clock unit when the determination unit outputs the signal is before the reference time.

In the air volume changing device for an air conditioner configured to automatically reduce the discharge air volume when the brightness of the room to be conditioned falls below a predetermined value, an operation of automatically reducing the discharge air volume is predetermined. It is provided with a malfunction prevention unit that regulates the operation to be performed after the set time.

[0009]

In the air volume control device for an air conditioner configured as described above, when the brightness of the conditioned room becomes lower than a predetermined value, the air volume is reduced to reduce the noise of the conditioned room, and the storage unit stores It is possible to prevent the air volume from decreasing before the stored reference time, thereby preventing the air conditioning capacity from decreasing during the day.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a main block diagram showing an electric circuit of the air conditioner. 1 is a plug connected to a commercial power supply, 2 is a power supply circuit, 3A main fuse 3, full-wave rectifier circuit 4,
First stabilizing circuit 5 that outputs DC power (38 [V]) for driving a DC motor, DC power (5 [V]) for electronic components
, And a fuse 7 for electronic components of the first stabilizing circuit 6 and 1A.

Reference numeral 8 denotes a control circuit unit, to which electronic parts are connected mainly to a microcomputer (hereinafter referred to as a microcomputer) 9. Reference numeral 10 denotes a photodetector (Cds, photodiode, fat transistor, etc., whose internal resistance changes according to the amount of light). After the internal resistance is converted into a voltage, this voltage is converted into an A / D (analog / analog). (Digital) port to the microcomputer 9. The microcomputer 9 internally sets a digital value corresponding to the amount of light (illuminance or brightness), and performs control based on the digital value.

Reference numerals 11 and 12 denote a room temperature detector and a heat exchanger temperature detector, respectively, whose internal resistance changes like the photodetector 10, and are taken into the microcomputer 9 from the A / D port.

A switch unit 13 sets various installation conditions and the like. The microcomputer 9 scans and takes in the setting state of the switch section. Reference numeral 14 denotes a display unit for displaying an operation state of the air conditioner. This display is
Is performed by dynamic lighting. A wireless signal receiving unit 15 receives an operation signal and operation data from a remote controller (hereinafter, referred to as a remote controller) 16 and outputs the signal to the microcomputer 9.

Reference numeral 17 denotes a pulse motor whose rotation angle can be changed by an output from the microcomputer 9. The discharge direction of the conditioned air can be arbitrarily changed by driving the wind direction change plate with the pulse motor. A DC brushless motor 18 blows conditioned air to the conditioned room. 19
Reference numeral denotes an energization control unit of the brushless motor 18, which changes energization timing in accordance with the rotational position of the rotor and changes the voltage applied to the motor based on a signal from the microcomputer 9. Therefore, the number of rotations of the motor, that is, the air blowing amount can be changed based on the signal from the microcomputer 9.

An interface circuit 20 outputs a signal from the microcomputer 9 to the outdoor unit 23 via a terminal. This signal is an operation start signal, an operation mode signal, a frequency signal designating the operation capability of the compressor, and the like. The power relay 21 is controlled by the microcomputer 9 to close the normally open contact piece 22. This normally open contact piece 2
By closing 2, commercial power is supplied to the outdoor unit 23 via the terminals 1 and 2.

In the air conditioner configured as described above, the operation signal from the remote controller 16 is received by the receiving unit 15, and the microcomputer 9 transmits the outdoor unit 23 based on the received data.
And the air-conditioning operation is started by driving the brushless motor 18.

FIG. 2 is a flowchart showing the main operation of the microcomputer 9. First, when the air conditioning operation is started in step S1, the process proceeds to step S2, where the illuminance detected by the photodetector 10 and the temperatures detected by the temperature detectors 11 and 12 are input. Next, in step S3, a frequency signal to be sent to the outdoor unit 23 is calculated. The calculation method includes a difference e between the room temperature and the set room temperature, and a change amount Δe per unit time of the difference e.
And a fuzzy operation is performed to calculate. Or PID
Ask by. Next, in step S4, the number of rotations of the brushless motor 18, that is, the airflow signal is calculated. The calculation of the air volume signal is performed based on the frequency signal when automatic (set automatically by the operation of the remote controller), and a predetermined air volume signal is set when manual. Thereafter, correction based on illuminance or the like is performed.

In step S5, the frequency signal and the like calculated in step S3 are transmitted to the outdoor unit.

FIG. 3 is a flowchart showing the main part when calculating the air volume. In step S31, it is determined whether or not the air volume is automatically set. This judgment is made by the switch unit 1
3 or a signal for designating automatic setting of the air volume is sent from the remote controller 16.
When the automatic setting is set, the process proceeds to step S32, and the setting is automatically performed according to the frequency signal. F is the frequency signal
(0 Hz, 20 Hz to 150 Hz), the air volume signal P
(0 to 255, and the DC voltage applied to the brushless motor 18 increases with an increase in this value) is, for example, (hereinafter, an air volume signal during the heating operation) P = 1 when F <30.
When 30 ≦ F ≦ 100, P = F + 155, 100 <F
Is set as P = 255. In the case of manual setting, the process proceeds to step S33, and the air volume signal P is fixed as follows. When setting a strong wind, P = 255, and when setting a weak wind, P = 153 when F <75, and P = 255 when F ≧ 75. Thus, steps S31 to S33 constitute the air volume control unit.

After the basic air volume signal P has been calculated in steps S33 and S34, the flow advances to step S34 to determine whether the air volume signal P needs to be corrected. That is, it is determined whether or not it is necessary to change the air volume in the defrosting process, whether or not it is necessary to prevent the cold air, and whether or not the correction due to the fluctuation is required. Proceed to. In step S35, the air volume signal P is changed according to the type of correction.

Next, the illuminance is determined in step S36.
That is, it is determined whether or not the illuminance detected by the photodetector 10 is equal to or less than a predetermined value. When the illuminance is equal to or less than the predetermined value, the process proceeds to step S37. (Brightness Judgment Unit) This predetermined value is set to an illuminance (brightness by an interior lamp) by which the brightness of the conditioned room can be determined to be night. Step S37
Then, the current date is input from the clock unit, the reference time stored corresponding to this date is read from the storage unit, and the current time obtained from the clock unit is compared with the current time. If it is before, the process proceeds to step S39. (Malfunction prevention section)
The timer unit that measures the date and time is configured by a program of the microcomputer 9. First, there is a program for advancing time measurement of time data every second, and there is a program for advancing month and day data by one day every time this time data measures 24 hours. Further, the storage unit (constituted by the ROM in the microcomputer 9) has a date of △ / △ (actually stored as the 120th day) = 18:
A reference time corresponding to the date such as 00, ○ month × day = 18: 10, etc. is stored. (Or ○ month / day ~ ○
Month ○ day = 18:00, △ month × day ~ × month × day = 18:00
May be stored as). This reference time is a time one to two hours later than the sunset time of the day.

If it is determined in step S37 that the current time is after the reference time, the flow advances to step S38 to reduce the air volume signal P to P-50 (correction unit). The amount of decrease may not be constant, and may be set so as to increase as P increases according to the value of the airflow signal P. The air volume signal P is 12
It is reduced so that it does not become 0 or less. After the correction of the air volume signal P is completed, the process proceeds to step S39.

In step S39, the air volume signal P is output to the power supply controller 19, and the voltage applied to the brushless motor 18 is controlled to a voltage corresponding to the air volume signal P. That is, the air volume by the motor 18 is controlled to an air volume according to the air volume signal P.

When the air volume changing device for an air conditioner configured as described above is used, even if the illuminance in the room to be harmony falls below a predetermined value due to closing a curtain in the daytime or rainfall, the time is set as a reference. Before the time, that is, before sunset, the air volume is not reduced.

Therefore, only after the time when the surrounding area becomes quiet after sunset, the air volume can be reduced based on the detection of the illuminance, that is, the noise can be reduced.

Also, by setting the reference time according to the sunset time, it is possible to predict the time when the surroundings will be quiet due to the change of the moon, and to reduce the air flow according to the reference time to reduce the noise of the conditioned room. It can be achieved.

The reference time may be set to change every day, or may be set to change every month or every season. Further, the reference time may be arbitrarily set based on an average over several tens of days, regardless of the sunset time or the like.

[0028]

As described above, the present invention relates to an air flow control device for an air conditioner which automatically reduces the discharge air flow when the brightness of the conditioned room falls below a predetermined value. Since it has a malfunction prevention unit that regulates that the operation of automatically reducing is performed after a predetermined time,
The discharge air volume does not decrease due to malfunction before the predetermined time, and unnecessary decrease in air conditioning capacity can be prevented. That is, it is possible to prevent a decrease in capacity due to a malfunction when air conditioning capacity in daytime is required.

Further, an air volume control unit for controlling the amount of air discharged from the conditioned air based on the air volume signal, a brightness determination unit for outputting a signal when the brightness of the conditioned room falls below a predetermined value, In the air volume changer of the air conditioner having a correction unit that performs correction to reduce the discharge air volume to the air volume signal in response to a signal from the unit and performs air volume reduction at night, a clock unit that measures the date and time, A storage unit storing a reference time determined based on the sunset time for each month and a reference time corresponding to this month and date read by the clock unit from the storage unit, and a brightness determination unit outputs a signal. A malfunction prevention unit that invalidates the signal when the time measured by the clock unit is equal to or less than the reference time. By limiting the operation after the reference time, Te, can be prevented during the day of action. Since the reference time is determined based on the sunset time, the distinction between day and night can be correctly determined, and it is possible to prevent the operation of reducing the air volume from being performed erroneously near the evening and prevent the air conditioning capacity from being reduced.

[Brief description of the drawings]

FIG. 1 is a main part block diagram of an electric circuit of an air conditioner using an embodiment of the present invention.

FIG. 2 is a flowchart showing a main operation of the microcomputer.

FIG. 3 is a flowchart showing a main operation of air volume calculation.

[Explanation of symbols]

 9 Microcomputer 10 Photodetector 16 Remote controller 18 DC brushless motor 19 Power supply controller

Claims (2)

(57) [Claims] An air flow control unit for controlling a discharge air volume of the conditioned air based on the air flow signal; a brightness determination unit for outputting a signal when the brightness of the conditioned room falls below a predetermined value; In the air volume changer of the air conditioner having a correction unit that performs correction to reduce the discharge air volume to the air volume signal in response to a signal from the unit and performs air volume reduction at night, a clock unit that measures the date and time, A storage unit that stores a reference time determined based on the sunset time for each month and a reference time corresponding to this month and day is read from the storage unit for each month and day measured by the clock unit, and the brightness determination unit outputs a signal. And a malfunction prevention unit for invalidating the signal when the time measured by the clock unit is before the reference time. 2. An air volume change device for an air conditioner configured to automatically reduce a discharge air volume when the brightness of a room to be conditioned falls below a predetermined value. An air volume changing device for an air conditioner, comprising: a malfunction prevention unit that regulates the air flow to be performed after a predetermined time.