JPH0579684A - Air volume alternator for air conditioner - Google Patents

Abstract

PURPOSE:To prevent an erroneous operation by invalidating an output of a brightness decision unit even if the unit outputs before a reference time based on a sunset time of each date when clock counts in a captioned alternator for correcting a discharge air volume based on a brightness in a chamber to be conditioned. CONSTITUTION:An illuminance detected by a photodetector 10 and detected temperatures of temperature detectors 11, 12 are input to a microcomputer 9, which decides an air volume and controls a DC brushless motor 18 through a conduction controller 19. In this case, if the detected illuminance becomes a predetermined value or less, the air volume is reduced. On the other hand, the microcomputer 9 stores a reference time based on a sunset time of each date when the clock counts. When the detected illuminance becomes the predetermined value or less, it calls the reference time and compares it with a present time counted by the clock. If it is before the reference time, it operates an erroneous operation preventing unit to invalidate a decrease in the air volume upon decreasing of the illuminance.

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 by a blower at night to reduce noise.

[0002]

2. Description of the Related Art As a conventional technique, Japanese Patent Laid-Open No. 58-117
There was a thing as described in 943 gazette. What is described in this publication is, "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, the control device is provided with a photodetector to detect the illuminance of a room. , It detects changes in illuminance at bedtime and automatically changes the set temperature. ”

With such a structure, it is possible to automatically perform a rest operation at bedtime after the light is turned off.

[0004]

It is generally known that when the conventional technique as described above is used, it is known to reduce the amount of air blow during quiet operation to reduce noise. When the illuminance detected by the photodetector becomes equal to or less than a predetermined value, it is easily conceivable to reduce the amount of conditioned air discharged to reduce the noise in the conditioned room.

However, it is difficult to set the predetermined value of the illuminance. In other words, it is difficult to distinguish when the outside light is blocked by curtains during the daytime or when it is raining in the evening. There was one.

The present invention relates to an air flow rate changing device for an air conditioner in which the air flow rate is not erroneously reduced during the daytime in response to such problems.

[0007]

According to the present invention, there is provided an air volume control unit for controlling the 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. In the air volume changing device of the air conditioner for reducing the air volume at night, which has a temperature determining section and a correcting section for correcting the air volume signal in response to the signal from the determining section to reduce the air volume, The clock section that keeps time, the storage section that stores the reference time that is set based on the sunset time for each month, and the reference time that corresponds to this month and day from the storage section that reads the brightness When the time determination unit outputs a signal, the clock unit counts the time before the reference time, and the malfunction prevention unit invalidates the signal.

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

[0009]

In the air volume control device of the air conditioner configured as described above, when the brightness in the room to be conditioned falls below a predetermined value, the volume of the air is reduced to make the room to be conditioned quieter and the storage section It is possible to prevent the air volume from being reduced before the stored reference time, and to prevent a decrease in the daytime air conditioning capacity.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of essential parts showing an electric circuit of the air conditioner. 1 is a plug connected to a commercial power source, 2 is a power supply circuit, 3 A main fuse 3, full-wave rectification circuit 4,
First stabilizing circuit 5 for outputting DC power (38 [V]) for driving a DC motor, DC power (5 [V]) for electronic parts
It is composed of a second stabilizing circuit 6 for outputting the electric current and a fuse 7 for the electronic component of 1A.

Reference numeral 8 denotes a control circuit section, to which electronic components are connected mainly by a microcomputer (hereinafter referred to as a microcomputer) 9. Reference numeral 10 denotes a photodetector (Cds, photodiodes, fat transistors, etc., whose internal resistance value changes depending on the amount of light). After the internal resistance value is converted into a voltage, this voltage is converted to A / D (analog / analog). It is taken into the microcomputer 9 from the digital port. The microcomputer 9 internally sets a digital value corresponding to the amount of light (illuminance or brightness), and controls based on this digital value.

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

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

Reference numeral 17 is a pulse motor, the rotation angle of which can be changed by the output from the microcomputer 9. By driving the wind direction changing plate with this pulse motor, the discharge direction of the conditioned air can be arbitrarily changed. A DC brushless motor 18 blows conditioned air to the conditioned room. 19
Is an energization control unit of the brushless motor 18, which changes energization timing according to 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 amount of blown air can be changed based on the signal from the microcomputer 9.

Reference numeral 20 denotes an interface circuit, which 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 that specifies the operation capacity of the compressor, or the like. Reference numeral 21 is a power relay whose energization is controlled by the microcomputer 9 to close the normally open contact piece 22. This normally open contact piece 2
When 2 is closed, commercial power is supplied to the outdoor unit 23 via the terminals 1 and 2.

In the air conditioner configured as described above, the receiving unit 15 receives the operation signal from the remote controller 16, and the microcomputer 9 based on the received data, the outdoor unit 23.
To the brushless motor 18 to start the air conditioning operation.

FIG. 2 is a flow chart 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, and the illuminance detected by the photodetector 10 and the temperatures detected by the temperature detectors 11 and 12 are input. Next, in step S3, the frequency signal sent to the outdoor unit 23 is calculated. As a method of calculating this, the difference e between the room temperature and the room temperature set value and the variation Δe of this difference e per unit time
The fuzzy operation is performed using and. Or PID
Ask by. Next, in step S4, the rotation speed of the brushless motor 18, that is, the air volume signal is calculated. This air volume signal is calculated based on the frequency signal when it is automatic (set automatically by operating the remote controller), and a predetermined air volume signal is set when it is manual. After that, the correction based on the illuminance or the like is performed.

In step S5, the frequency signal calculated in step S3 is transmitted to the outdoor unit.

FIG. 3 is a flow chart of the main part when calculating the air volume. In step S31, it is determined whether the air volume is set automatically. This judgment is made by the switch unit 1
3 or whether or not a signal designating the automatic air volume setting is sent from the remote controller 16 or not.
When the automatic setting is set, the process proceeds to step S32 and is automatically set according to the frequency signal. Frequency signal is F
(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 as this value increases) is, for example, (hereinafter, the air volume signal during heating operation) F <30, P = 1,
When 30 ≦ F ≦ 100, P = F + 155, 100 <F
At the time of, P = 255 is set. In the case of manual setting, the process proceeds to step S33, and the air volume signal P is fixed as follows. When the strong wind is set, P = 255, when the weak wind is set, P = 153 when F <75, and P = 255 when F ≧ 75. In this way, the air volume control unit is configured in steps S31 to S33.

After the basic air volume signal P is calculated in steps S33 and S34, the process proceeds to step S34, and it is determined whether or not the air volume signal P needs to be corrected. That is, it is determined whether the air volume needs to be changed in the defrosting process, whether cold air is required to be prevented, and whether correction due to fluctuation is required. If correction is required, step S35 is performed. Go to. In step S35, the air volume signal P is changed according to the type of correction.

Next, in step S36, illuminance determination is performed.
That is, it is determined whether the illuminance detected by the photodetector 10 is less than or equal to a predetermined value, and if the illuminance is less than or equal to the predetermined value, the process proceeds to step S37. (Brightness determination unit) This predetermined value is set to an illuminance (brightness by an interior light) with which it can be determined that the brightness of the conditioned room is night. Step S37
Then, input the current month and day from the clock section, read the reference time stored corresponding to this month and day from the storage section, and compare it with the current time obtained from the clock section. If yes, go to step S39. (Malfunction prevention unit)
The timer unit for measuring the date and time is composed of a program of the microcomputer 9. First, there is a program for advancing time measurement of time data every one second, and there is a program for advancing month / day data one day every time this time data measures 24 hours. Further, in the storage unit (constituted by the ROM in the microcomputer 9), the month ◯ ΔΔ (actually, it is stored as on the 120th day) = 18:
The reference time corresponding to the month and day is stored such as 00, ◯ month × day = 18: 10. (Or ○ month △ day〜 ○
Month ○ day = 18:00, △ month × day to × month × day = 18:20
May be stored as). This reference time is one to two hours after the sunset time on that day.

When 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 = P-50 (correction unit). The amount of decrease may not be constant but may be set in accordance with the value of the air volume signal P such that the amount of decrease increases as P increases. The air volume signal P is 12
It is reduced so that it does not fall below 0. 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 energization control section 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 the 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 conditioned falls below a predetermined value due to curtain closing in the daytime, rain, etc., the time is used as a reference. Before time, that is, before sunset, the air volume is not reduced.

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

Further, by setting the reference time according to the sunset time, it is possible to predict the time when the surroundings become quiet due to the change of the month and day, reduce the air volume according to the reference time, and reduce the noise in the room to be conditioned. It can be achieved.

The reference time may be set to be changed every day, or may be set to be changed monthly or seasonally. Further, the reference time may be arbitrarily set based on the average of several tens of days, etc. regardless of the sunset time and the like.

[0028]

As described above, according to the present invention, when the brightness of the room to be conditioned falls below a predetermined value, the discharged air volume is automatically reduced. Since it has a malfunction prevention unit that regulates the operation to automatically reduce the operation after a predetermined time,
It is possible to prevent the discharge air volume from decreasing due to a malfunction before a predetermined time, and to prevent unnecessary reduction of the air conditioning capacity. That is, it is possible to prevent the capacity from being lowered due to a malfunction when the daytime air conditioning capacity is required.

Further, an air volume control section for controlling the discharge air volume of the conditioned air based on the air volume signal, a brightness determining section for outputting a signal when the brightness of the conditioned room is below a predetermined value, and this determination. In the air volume change device of the air conditioner that has a correction unit that corrects the air volume signal in response to a signal from the unit to reduce the air volume signal, the air volume change device of the air conditioner that reduces the air volume at night, and a clock unit that measures the date and time, The storage unit that stores the reference time determined based on the sunset time for each month and day, and the reference time corresponding to this month and day that is measured by the clock unit are read from the storage unit, and the brightness determination unit outputs a signal. Since there is a malfunction prevention unit that invalidates the signal when the time measured by the clock unit is before this reference time, there is no reduction in the air flow when the brightness in the controlled room falls below a predetermined value. 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, it is possible to correctly determine the distinction between day and night, and it is possible to prevent the air-conditioning capacity from being lowered due to the erroneous operation of reducing the air flow near the evening.

[Brief description of drawings]

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

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

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

[Explanation of symbols]

 9 Microcomputer 10 Photodetector 16 Remote control 18 DC brushless motor 19 Energization controller

Claims (2)

[Claims] 1. An air volume control unit for controlling a discharge air volume of conditioned air based on an air volume signal, a brightness determining section for outputting a signal when the brightness of a conditioned room falls below a predetermined value, and this determination. In the air volume change device of the air conditioner that has a correction unit that corrects the air volume signal in response to a signal from the unit to reduce the air volume signal, the air volume change device of the air conditioner that reduces the air volume at night, and a clock unit that measures the date and time, A storage unit that stores a reference time set based on the sunset time for each month and day, 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 An air flow rate change device for an air conditioner, comprising: a malfunction prevention unit that invalidates the signal when the time measured by the clock unit is before the reference time. 2. An air conditioner air amount change device for automatically reducing the amount of discharged air when the brightness of a room to be conditioned falls below a predetermined value. An air flow rate changing device for an air conditioner, comprising an erroneous operation prevention unit that restricts the operation to be performed after a predetermined time.