JPH0552399A - Controller for air conditioner - Google Patents

Abstract

PURPOSE:To surely control rotational speed of a motor of an indoor blower to present sound offensive to the ear by outputting delay signal, wherein response delay is given to electric signal outputted from a sound detection means, and providing a means for determining the rotational speed of the motor based on said delay signal. CONSTITUTION:Electric signals corresponding to the magnitude of sound in a room where a device is installed are outputted from a sound detection means 31. Delay signals, wherein response delay is given to said electric signals, are outputted from a signal processing means 77, following which rotational speeds of a motor of an indoor blower 7 is determined based on said delay signals by a motor speed determining means 79. Even if sound of very short period, except sound of music, has been detected, speed of the motor is not controlled based on an abrupt sound, so that the speed of indoor blower motor can be controlled surely, thereby preventing motor sound offensive to the ear.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Generally, when listening to music in an air-conditioned audio room, when the volume of the music is reduced according to the composition of the music, the motor sound of an indoor blower can be heard as a dissonance. There is. In order to eliminate this, conventionally, a microphone is built in the indoor unit, the sound in the audio room is detected by this microphone, and when the value of the detected sound is larger than the preset value of the sound, It has been proposed that the number of revolutions of the motor of the indoor blower is maintained as it is and that the number of revolutions of the motor is decreased when the detected sound value is smaller than the sound set value. (For example, JP-A-60-4741).

[0003]

However, in the conventional configuration, while the rotation speed of the motor of the indoor blower is being decreased in accordance with the decrease in the acoustic value in the audio room, the audio value in the audio room is reduced. , When a sound for a very short time, which is larger than the sound set value, such as a sound of a human being, is generated, the problem that the rotation speed of the motor of the indoor blower is increased by following the sound for a very short time There is.

In this case, there is a problem that the number of rotations of the motor of the indoor blower is increased after the sound is generated.

Further, in the conventional configuration, in order to perform control to raise the rotational speed of the motor of the indoor blower once, and then lower the rotational speed of the motor again to match the acoustic value in the audio room, the acoustic Since there is a considerable time delay from the time of disappearance, there is a problem that the sound caused by the high speed rotation of the motor remains as a dissonance for a while after the sound for a short time disappears.

Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art, and even if the sound for a very short time is detected, the rotation speed control of the motor of the indoor blower is not affected. It is to provide a control device for an air conditioner.

[0007]

In order to achieve the above object, the present invention relates to an air conditioner control device for controlling the number of revolutions of an indoor blower housed in an airframe, in which the indoor space in which the airframe is installed. Acoustic detection means for outputting an electric signal according to the magnitude of the sound, signal processing means for outputting a delay signal that causes a response delay in the electric signal output from the acoustic detection means, and output from this signal processing means And a motor rotation speed determining means for determining the rotation speed of the motor based on the value of the delayed signal.

[0008]

According to the present invention, when the sound in the room is detected by the sound detecting means, it is converted into an electric signal according to the magnitude of the sound and output to the signal processing means. In this signal processing means, the electric signal is subjected to predetermined signal processing, and from this, a delay signal that causes a response delay is output to the motor rotation speed determination means. When the delay signal is output, the motor rotation speed determination means determines the rotation speed of the motor that drives the indoor blower. For example, when the time during which the signal value from the sound detection means exceeds the set value is shorter than the predetermined reference time, the detected sound is a suddenly generated sound for a very short time, The rotation speed of is maintained at the rotation speed at the time of sound detection without following it. When the time when the signal value from the sound detecting means exceeds the set value is longer than the predetermined reference time, the rotation speed of the motor that drives the indoor blower is determined according to the result.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 2 and FIG. 3, reference numeral 1 denotes an indoor unit, and this indoor unit 1 has a lid portion 5 on the front surface of the indoor unit body 3.
Is configured to be openable and closable.

An indoor blower 7 is provided inside the indoor unit body 3 as shown in FIG. 4, and when the indoor blower 7 is driven by a motor (not shown),
Indoor air is sucked through the suction grill 9 of the lid portion 5, the air is heat-exchanged through the indoor heat exchanger 11, and then blown out into the room through the air outlet 13. In addition, a vertical blade 15 and a plurality of horizontal blades 17 are provided in the vicinity of the outlet 13 to set the outlet direction.

An indoor heat exchanger temperature sensor 19, an indoor temperature sensor 21, and an indoor humidity sensor 23 are provided above the interior of the indoor unit body 3. Further, as shown in FIG. 3, a display unit 25 is provided on the lower front surface of the indoor unit body 3, a display unit 25 is provided with a receiving unit 27, and the receiving unit 27 is shown in FIG. As described above, the command signal wirelessly transmitted from the remote control device 29 is received.

The display unit 25, however, is provided with the microphone 31 according to this embodiment. This microphone 31, as shown in FIG.
It is intended to detect the loudness of the sound generated from 2, and it is desirable to provide it at a position where the sound of the air blown out from the outlet 13 is not detected so much, and it is not inside the indoor unit 1 but outside it. It is desirable to provide it.

For example, it is desirable to pull out the remote control case 35 from the indoor unit 1 using the signal line 33 and to provide the microphone 31 in the pulled out remote control case 35. The microphone 31
As shown in FIG. 2, it may be provided in the remote control device 29, and in this case, the acoustic signal detected by the microphone 31 is transmitted along with the control signal transmitted from the transmission unit 37 of the remote control device 29. ..
Reference numeral 39 is an operation switch, 41 is a silent switch, 43 is a wind speed switching button, and 45 is a set temperature switching button.

When the audio device 32 is provided with an output jack (sound output terminal) 47, instead of the microphone 31, a signal line 49 is drawn from the output jack 47 and connected to the indoor unit 1. Good. Further, the signal line 49 may be connected to the remote control device 29, and in this case, the acoustic signal taken out from the output jack 47 is transmitted by the transmitter 37 of the remote control device 29.
It is transmitted on the control signal transmitted from.

FIG. 1 is a block diagram of an air conditioner according to an embodiment of the present invention and a control device for an air conditioner according to an embodiment of the present invention.

In the figure, an air conditioner according to an embodiment of the present invention is composed of an indoor unit 1 and an outdoor unit 55. The indoor unit 1 side is provided with a control system (control device), an indoor blower 7, and an indoor heat exchanger 11 which will be described later, and the outdoor unit 55 side is provided with an inverter 57 placed under the control of the above control system. A compressor 59, an accumulator 61, a four-way valve 63, an outdoor heat exchanger 65, an outdoor blower 67, and an electric expansion valve 69 are provided. These constitute a refrigerant circulation system.

An air conditioner controller according to an embodiment of the present invention includes a filter 71, an amplifier 73, an integrating circuit 75, a microcomputer 77, and a drive motor control circuit (hereinafter referred to as a motor control circuit) 79 for the indoor blower 7. Is equipped with.

In FIG. 1, the loudness of the sound in the room in which the indoor unit 1 is installed is detected by the microphone 31, and an electric signal corresponding to the loudness of the sound is obtained.
It is output from the microphone 31 to the filter 71. As the filter 71, as shown in FIG. 5, a low pass filter composed of a CR element is used. The electric signal output from the filter 71 is amplified by the amplifier 73 and then output to the integrating circuit 75.

According to this embodiment, however, the integrating circuit 75
In FIG. 6, a charge / discharge asymmetrical integrating circuit (hereinafter referred to as “asymmetrical integrating circuit”) is used.

This asymmetrical integrator circuit 75 has a diode D ₁ for preventing a current from flowing to the input side, and keeps the potential difference between the cathode terminal of the diode D ₁ and the ground at a constant value or more. of Kon'nsa C _1, diode D _2, the charge and discharge capacitor C _2, the resistance r ₂ which forms a CR time constant circuit together with the charging and discharging capacitor C ₂ at the time of charging for the charging and discharging capacitor C _2, a capacitor C ₂ for charging and discharging Has a resistor r ₁ which forms a CR time constant circuit together with a charging / discharging capacitor C ₂ via a diode D ₂ during the discharge of. As the element used for the resistance r ₁ and the element used for the resistance r ₂ , a resistance element satisfying r ₁ <r ₂ is selected.

In the above structure, the charging / discharging capacitor C
At the time of charging to ₂ , the current flowing through the diode D ₁ passes through the resistor r ₂ and the charging / discharging capacitor C ₂
Flows into the charging current as charging current, while charging / discharging capacitor C
_When discharging from ₂ , the discharge current from the capacitor C ₂ flows into the resistor r ₁ through the diode D ₂ .

As described above, the relationship of r ₁ <r ₂ is established between the resistors r ₁ and r ₂ , so that the time constant r ₂ C ₂ during charging of this asymmetrical integrator circuit and the discharge The relationship of r ₂ C ₂ > r ₁ C ₂ is established with the time constant r ₁ C ₂ of time.

That is, as shown in FIG. 7, the output characteristic of the asymmetrical integrator circuit 75 has a fairly gentle rising waveform at the time of charging (a considerable response delay occurs at the time of rising) and is abrupt at the time of discharging. It has a falling waveform (the response delay at the falling is considerably smaller than that at the rising).

The electrical signal output from the asymmetrical integration circuit 75 is output to the microcomputer 77. The microcomputer 77 has an arithmetic processing unit and a storage unit (both not shown). When the electric signal is output from the asymmetric integration circuit 75, the arithmetic processing unit stores the setting value information stored in the storage unit. (That is, the set value of the magnitude of the electric signal for determining whether or not to change the rotation speed of the motor of the indoor blower 7) is read, and it is checked whether or not there is a portion in the electric signal that exceeds the set value. To do.

As a result of this check, if it is determined that there is a part in the electric signal that exceeds the set value, the arithmetic processing section indicates from the storage section predetermined reference time value information (that is, the set value in the electric signal or more). The time length of the part exceeds the set value of the electric signal by reading out the time reference value for judging whether or not the rotation speed of the motor of the indoor blower 7 is changed). And based on the result of this comparison,
Determine the number of rotations of the motor. The arithmetic processing unit outputs control information to the motor control circuit 79 and also outputs a control signal to the inverter 57.

According to this embodiment, however, the electric signal from the microphone 31 is subjected to signal processing through the asymmetrical integration circuit 75, from which it is output to the microcomputer 77 as a delayed signal with a delayed response. Therefore, the number of revolutions of the motor of the indoor blower 7 is not controlled by a sudden sound or the like for a very short time, and the motor of the indoor blower 7 responds only to the volume of the sound that should be controlled. The number of rotations can be controlled reliably.

FIG. 8 is a circuit diagram of the integrating circuit 75 of FIG. 1 (that is, FIG. 7).
7 is a flow chart when the function is replaced by the microcomputer 77 without providing the asymmetrical integration circuit shown in FIG.

That is, the cumulative value of the acoustic information (digital value: sampling value) at the end of counting the predetermined time from the timer (not shown) built in the microcomputer 77 is counted up by the timer last time. When it is larger than the cumulative value of the acoustic information at that time, the time T ₁ is set in the timer, the drive voltage of the motor of the indoor blower 7 is increased by one preset step, and then the process returns. (Step 81,
83, 85, 87).

On the other hand, when it is determined in step 83 that the cumulative value of the acoustic information has not increased from the previous time, the timer is set to time T ₂ (T ₁ > T ₂ ) and the motor of the indoor blower 7 is set. After decreasing the driving voltage of 1 step by a preset step, the process returns (step 8
9, 91).

It goes without saying that even with such control, the same effect as that provided with the asymmetrical integration circuit can be obtained.

[0032]

As described above, according to the present invention,
A sound detection unit that detects a sound in the room where the indoor unit is installed and outputs an electric signal according to the detected sound volume, and a response delay occurs in the electric signal output from the sound detection unit. Since it is provided with the signal processing means for outputting the delayed signal thus generated and the motor rotation speed determining means for determining the rotation speed of the motor based on the delay signal output from this signal processing means, it is possible to use only the sound other than the sound of music. Even if a short-time sound is detected, this sudden sound does not control the rotation speed of the motor, but only responds to the loudness of the sound that should be controlled. Can be reliably controlled. Therefore, a music lover can be provided with a control device for an air conditioner in which no audible motor noise is heard.

[Brief description of drawings]

FIG. 1 is a block diagram of a control device for an air conditioner showing an embodiment of the present invention.

FIG. 2 is a perspective view showing an indoor unit of the air conditioner shown in FIG.

FIG. 3 is a perspective view of a main part of the indoor unit of the air conditioner shown in FIG.

FIG. 4 is a side sectional view showing an indoor unit of the air conditioner shown in FIG. 2.

5 is a circuit configuration diagram of a low-pass filter of the control device for the air conditioner shown in FIG. 1. FIG.

FIG. 6 is a circuit configuration diagram of an asymmetrical integration circuit of the control device for the air conditioner shown in FIG. 1.

7 is an output characteristic diagram of the asymmetric integration circuit shown in FIG.

FIG. 8 is a flowchart of a control device for the air conditioner shown in FIG.

[Explanation of symbols]

 7 Indoor blower 31 Microphone 75 Integration circuit 77 Microcomputer 79 Motor control circuit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuji Owaku, 2-18 Keihan Hondori, Moriguchi City, Osaka Prefecture Sanyo Electric Co., Ltd. (72) Inventor, Shoji Kawaguchi 2-18, Keihan Hondori, Moriguchi City, Osaka Sanyo Denki Within the corporation

Claims (1)

[Claims] 1. A control device for an air conditioner having an indoor heat exchanger and an indoor blower built into a machine body, and sound detection means for outputting an electric signal according to the magnitude of sound in the room in which the machine body is installed. A signal processing means for outputting a delay signal in which a response delay is generated in the electric signal output from the acoustic detecting means, and a rotation speed of a motor of the indoor blower based on the delay signal output from the signal processing means. A control device for an air conditioner, comprising: a motor rotational speed determination means for determining.