JP2000304329A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an air conditioner in which adverse effect of disturbance can be suppressed. SOLUTION: When cooling operation is started, initial setting of cooling operation is performed and, upon elapsing a predetermined time, outdoor air temperature G and indoor air temperature S are taken in and stored. Subsequently, variation of outdoor air temperature ΔG, difference e between the indoor air temperature S and a set temperature, and fluctuation Δe of the difference e are calculated (Steps 200-206). Furthermore, a difference ΔHzff being used in feedforward control is determined from a previously prepared table based on the outdoor air temperature G and the variation of outdoor air temperature ΔG, a difference ΔHzfb being used in feedback control is determined based on the difference e and the fluctuation Δe of the difference e, and the target frequency of input power to a motor for driving a compressor is calculated and set based on the differences ΔHzff, ΔHzfb (Steps 208-212).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner, and more particularly, to an air conditioner capable of suppressing the influence of external temperature disturbance.

[0002]

2. Description of the Related Art An air conditioner (hereinafter referred to as an "air conditioner") for controlling air in a room is designed to cool and heat the room by repeatedly circulating the refrigerant while repeatedly compressing and condensing the refrigerant by rotating a compressor.

In such a conventional air conditioner, generally, the indoor temperature is controlled by controlling the rotational drive of a compressor by feedback control such as PI control or fuzzy control based on the difference between the indoor temperature and a set temperature (target temperature). Was.

[0004]

However, the above-mentioned conventional air conditioner cannot sufficiently compensate for the influence of disturbances such as the outside temperature of the building where the air conditioner is installed (hereinafter referred to as "outside temperature"). was there. As a result, indoors may feel hot or chilly.

[0005] The present invention has been made to solve the above problems, and an object of the present invention is to provide an air conditioner capable of suppressing an adverse effect due to disturbance.

[0006]

In order to achieve the above object, the invention according to claim 1 comprises an outside air temperature detecting means for detecting an outside air temperature, an outside air temperature detected by the outside air temperature detecting means, and the outside air temperature. Control means for controlling the room temperature by feedforward control based on at least one of the temperature change rates.

According to the first aspect of the present invention, the outside air temperature is detected by the outside air temperature detection means, and the feedforward control is performed by the control means based on at least one of the detected outside air temperature and the rate of change of the outside air temperature. Controls the room temperature. The change rate of the outside air temperature is a change amount of the outside air temperature per unit time.

According to the first aspect of the present invention, since the room temperature is controlled by the feedforward control based on at least one of the outside air temperature and the rate of change of the outside air temperature, the outside air temperature changes rapidly. Therefore, the adverse effect of the disturbance of the outside air temperature can be suppressed.

According to a second aspect of the present invention, in the first aspect of the present invention, there is further provided an indoor temperature detecting means for detecting an indoor temperature, wherein the control means includes the indoor temperature detecting means in addition to the feedforward control. And performing feedback control based on at least one of a deviation between the room temperature and the set temperature detected by the method and a rate of change of the deviation, thereby controlling the room temperature.

According to the invention described in claim 2, according to claim 1
The control means in the invention described above performs feedback control based on at least one of a deviation between the indoor temperature detected by the indoor temperature detection means and the set temperature and a change rate of the deviation in addition to the feedforward control. Temperature is controlled. The rate of change of the deviation is
This is the amount of change of the deviation per unit time.

According to the second aspect of the present invention, the same effects as those of the first aspect of the invention can be obtained, and the control means controls the indoor temperature and the set temperature in addition to the feedforward control. Since the room temperature is controlled by performing feedback control based on at least one of the deviation and the rate of change of the deviation, more effective air conditioning can be performed according to the change in the room temperature.

According to a third aspect of the present invention, in the first or second aspect of the present invention, during the cooling operation in the feedforward control, the cooling capacity increases as the outside air temperature increases. When the rate of change of the outside air temperature is increasing, the cooling capacity is increased, and when the rate of change of the outside air temperature is decreasing, control is performed such that the cooling capacity is decreased. During the heating operation, the heating capacity decreases as the outside air temperature increases, and the heating capacity decreases when the change rate of the outside air temperature increases, and the change rate of the outside air temperature decreases. In such a case, it is preferable to control so that the heating capacity is increased.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the control means includes a heat insulation degree, a heat loss degree, and an airtightness of the installed building. It is preferable to perform the feedforward control in consideration of at least one of the values indicating the degrees of the above.

[0014] This makes it possible to control the room temperature more suitable for the characteristics of the building in which the air conditioner of the present invention is installed.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows an embodiment of an air conditioner (hereinafter referred to as "air conditioner 10") to which the present invention is applied. The air conditioner 10 includes an indoor unit 12 and an outdoor unit 14, and is operated / stopped by operating a wireless remote control switch (hereinafter, referred to as "remote controller 120") provided as a remote control unit. When the operating condition such as the operating mode and the set temperature is set by the remote controller 120 and an operation signal is transmitted, the air conditioner 10 receives the operation signal in the indoor unit 12 and operates based on the operation signal. .

FIG. 2 shows an indoor unit 1 of the air conditioner 10.
2 schematically shows a refrigeration cycle configured between the outdoor unit 2 and the outdoor unit 14. Between the indoor unit 12 and the outdoor unit 14, a pair of thick refrigerant pipes 16 </ b> A and a thin refrigerant pipe 16 </ b> B for circulating the refrigerant are provided in pairs, and one end of each of the heat pipes is provided in the indoor unit 12. It is connected to the exchanger 18.

The other end of the refrigerant pipe 16A is connected to the outdoor unit 1
4 is connected to the valve 20A. This valve 20A
Is connected to the four-way valve 24 via the muffler 22A. Each of the four-way valves 24 has a compressor 26.
Accumulator 28 and muffler 22B connected to
Is connected. Further, the outdoor unit 14 is provided with a heat exchanger 30. One end of the heat exchanger 30 is connected to the four-way valve 24, and the other end is connected to the valve 20 B via a capillary tube 32, a strainer 34, an electric expansion valve 36, and a modulator 38. The other end of the refrigerant pipe 16B is connected to the valve 20B, so that the indoor unit 12 and the outdoor unit 1 are connected.
A closed circulation path of the refrigerant forming a refrigeration cycle is formed between the four.

The air conditioner 10 can perform a cooling or heating operation by circulating the refrigerant in the refrigeration cycle by operating the compressor 26.

That is, in the cooling mode, the refrigerant compressed by the compressor 26 is liquefied by being supplied to the heat exchanger 30, and the liquefied refrigerant is vaporized by the heat exchanger 18 of the indoor unit 12. The air passing through the heat exchanger 18 is cooled. In the heating mode, on the contrary, the refrigerant compressed by the compressor 26 radiates heat by being condensed in the heat exchanger 18 of the indoor unit 12, and the air passing through the heat exchanger 18 by the heat radiated by the refrigerant. Heat.

In FIG. 2, the flow of the refrigerant in the cooling mode (cooling operation) and the heating mode (heating operation) are indicated by arrows. By switching the four-way valve 24, the operation mode is changed to the cooling mode (dry mode). The evaporating temperature of the refrigerant is adjusted by switching the heating mode and controlling the valve opening of the electric expansion valve 36.

FIG. 3 shows a schematic cross section of the indoor unit 12. The interior of the indoor unit 12 is covered with a casing 42 which is locked above and below (up and down in the plane of FIG. 3) a mounting base 40 which is mounted on an indoor wall surface (not shown). In this casing 42, a cross flow fan 44 is arranged at the center. The heat exchanger 18 is disposed from the front side to the upper side of the cross flow fan 44, and the heat exchanger 18 and the casing 42
A filter 48 is arranged between the front side and the suction port 46 formed on the upper side. An outlet 50 is formed at a lower portion of the casing 42.

Thus, in the indoor unit 12, the rotation of the cross flow fan 44 causes the air in the room to be sucked in from the suction port 46, passes through the filter 48 and the heat exchanger 18, and then blows out from the blowout port 50 toward the room. Is done. In the indoor unit 12, the heat exchanger 18 is cooled or heated by the operation of the refrigeration cycle, and the air sucked from the room is cooled or heated by the heat exchanger 18 when passing through the heat exchanger 18. The air is blown out into the room to achieve indoor air conditioning.

A left and right flap 52 and an upper and lower flap 54 are provided in the air outlet 50.
The direction of the conditioned air blown out can be changed by the second and upper and lower flaps 54.

As shown in FIG. 4, the indoor unit 12
Is provided with a power supply board 56, a control board 58, and a power relay board 60. On a power supply board 56 to which electric power for operating the air conditioner 10 is supplied, a motor power supply 62, a control circuit power supply 64, a serial power supply 66, and a drive circuit 68 are provided. The control board 58 is provided with a serial circuit 70, a drive circuit 72, and a microcomputer 74.

The drive circuit 68 of the power supply board 56 is connected to a fan motor 76 (for example, a DC brushless motor) for driving the cross flow fan 44, and receives a control signal from a microcomputer 74 provided on the control board 58. In response, driving power is supplied from the motor power supply 62.
At this time, the microcomputer 74 controls the speed of the fan motor 76 by controlling the output voltage from the drive circuit 68 to change in the range of 12 V to 36 V in 256 steps.

The drive circuit 72 of the control board 58 is connected to an upper and lower flap motor 78 for operating the power relay board 60 and the upper and lower flaps 54. The power relay board 60 is provided with a power relay 80, a temperature fuse, and the like. The power relay 80 is operated by a signal from the microcomputer 74 to open and close a contact 80A for supplying power to the outdoor unit 14. Air conditioner 1
In the case of 0, the electric power is supplied to the outdoor unit 14 when the contact 80A is closed, so that the outdoor unit 14 is operated.

The upper and lower flap motors 78 are controlled in accordance with a control signal from the microcomputer 74 to operate the upper and lower flaps 5.
Operate 4. When the upper and lower flaps 54 are swung in the vertical direction, the outlet 50 of the indoor unit 12 is opened.
The direction in which air is blown out of the apparatus is changed in the vertical direction.

As described above, in the indoor unit 12 of the air conditioner 10, by controlling the rotation of the cross flow fan 44 and the operation of the upper and lower flaps 54, the air flow is controlled to a desired air volume and direction or to make the room comfortable. The air conditioned by the air volume and the wind direction can be blown into the room.

The serial circuit 70 is connected to the microcomputer 74 and the serial power supply 66 of the power supply board 56, and further to the outdoor unit 14. The microcomputer 74 performs serial communication with the outdoor unit 14 via the serial circuit 70, and controls the operation of the outdoor unit 14.

The indoor unit 12 is provided with a display circuit 82 provided with a receiving circuit for receiving an operation signal from a remote controller 120 described later, a display LED for operation display, and the like. 74. As shown in FIG. 1, the display portion 82A of the display substrate 82 is exposed on the surface of the casing 42, and an operation signal from the remote controller 120 is received and input by the display portion 82A.

As shown in FIG. 4, the microcomputer 74 is connected to a ROM 75, a room temperature sensor 84 for detecting a room temperature, and a heat exchange temperature sensor 86 for detecting a coil temperature of the heat exchanger 18, and a control board. The service LED provided at 58 and the operation changeover switch 88 are connected. Note that a temperature sensor is also provided in a remote controller 120 to be described later, and the room temperature is normally measured by the remote controller 120 and transmitted at a predetermined timing.

The ROM 75 stores various data such as a feed-forward table and a feedback table necessary for control in each of a cooling operation and a heating operation described later. Since the ROM 75 is an external ROM, the various data can be easily changed.

The operation changeover switch 88 is for switching between a normal operation and a test operation performed at the time of maintenance or the like.
The contact of the power switch 88A is opened so that the supply of the operating power to the air conditioner 10 can be cut off. Normal,
The operation changeover switch 88 is set to a normal operation. The service LED is turned on at the time of maintenance to notify a service person of a self-diagnosis result.

The indoor unit 12 is connected to the outdoor unit 14 via terminals 90A, 90B, 90C of the terminal board 90.

On the other hand, as shown in FIG. 5, the outdoor unit 14 is provided with a terminal plate 92, and terminals 92A, 92B and 92C of the terminal plate 92 are respectively connected to terminals 90A of the terminal plate 90 of the indoor unit 12. , 90B,
90C. Thereby, the outdoor unit 1
Operation power is supplied to the indoor unit 12 from the indoor unit 12, and serial communication with the indoor unit 12 is possible.

The outdoor unit 14 includes a rectifying board 9
4. A control board 96 is provided. The control board 96 includes a microcomputer 98, noise filters 100A, 100B, 100C, and a serial circuit 102.
And a switching power supply 104 and the like.

The rectifying board 94 is provided with a noise filter 100A.
Rectifies the power supplied through the
Switching power supply 1 after smoothing via 0B and 100C
04. The switching power supply 104 is connected to the inverter circuit 106 together with the microcomputer 98. As a result, electric power having a frequency corresponding to the control signal output from the microcomputer 98 is output from the inverter circuit 106 to the compressor motor 108, and the compressor 26 is rotationally driven.

The microcomputer 98 is connected to the inverter circuit 1
The frequency of the electric power output from 06 is off or a predetermined value (for example, 14 Hz) or more (the upper limit depends on the upper limit of the operating current)
Is controlled so that the rotation speed of the compressor motor 108, that is, the compressor 26, is changed.
0 cooling / heating capacity) is controlled.

The control board 96 includes a four-way valve 2
4 and a fan motor 110 for driving a fan (not shown) for cooling the heat exchanger 30 and a fan motor condenser 110A. Also, the outdoor unit 14
Are provided with an outside air temperature sensor 112 for detecting the outside air temperature, a coil temperature sensor 114 for detecting the temperature of the refrigerant coil of the heat exchanger 30, and a compressor temperature sensor 116 for detecting the temperature of the compressor 26. 98.

The microcomputer 98 switches the four-way valve 24 according to the operation mode, and also controls the control signal from the indoor unit 12, the outside air temperature sensor 112, and the coil temperature sensor 1
14 and the turning on / off of the fan motor 110 based on at least one of the detection results of the compressor temperature sensor 116.
It controls the operation frequency of the off and compressor motors 108 (the capacity of the compressor 26) and the like.

As shown in FIG. 1, the air conditioner 10 is operated by operating a remote control switch 120. FIG.
Remote control switch 120 for operating the air conditioner 10
An example is shown. The display unit 122 is provided on the remote control switch 120. In this display unit 122,
In addition to operation mode, set temperature, room temperature, time, wind direction,
The operating conditions or operating conditions for operating the air conditioner 10, such as the air volume, are displayed.

The remote control switch 120 includes a start / stop button 124, temperature setting buttons 126A, 126
Along with B, a 1H timer button 128 and a sleep button 130 are provided. The air conditioner 10 is operated / stopped by operating the operation / stop button 124. The set temperature (target temperature for air conditioning) can be changed by operating the temperature setting buttons 126A and 126B.

The remote control switch 120 is provided with a slide cover 134, in which various operation buttons such as an operation switching button, an air volume and air direction switching button, and a timer operation setting button are provided. An operation panel is provided, whereby the operation mode of the air conditioner 10 is switched between automatic, heating, dry, cooling, air cleaning, and the like, and the amount and direction of the conditioned air blown out from the outlet 50 are switched. Operation, setting of timer operation, etc. are possible.

The air conditioner 10 has a remote control switch 120
When an operation signal corresponding to the switch operation is input, an operation mode such as an operation mode and an air conditioning capacity is set according to the operation signal, and an air conditioning operation is performed based on the set operation condition. I have.

When controlling the cooling operation and the heating operation, the air-conditioner 10 performs feedforward control based on the outside air temperature in addition to feedback control based on the room temperature and the set temperature according to the following equation (1). It is based on.

Hz-ref = HZ + FFG × ΔHzff + FBG × ΔHzfb (1) Here, Hz-ref is a target frequency of electric power output to the compressor motor 108 for driving the compressor 26 to rotate, and Hz is a current frequency of the electric power (hereinafter, referred to as “Hz-ref”). , Current frequency), ΔHzff represents a feedforward term in the feedforward control as a difference value of the power with respect to the current frequency Hz (hereinafter referred to as FF frequency difference), FFG represents a feedforward gain, and ΔHzff represents a feedforward gain.
zfb indicates a feedback term in the feedback control as a difference value of the power with respect to the current frequency Hz (hereinafter, referred to as FB frequency difference), and FBG indicates a feedback gain.

The FF frequency difference ΔHzff is the outside air temperature (absolute value) G and the amount of change of the outside air temperature G for each predetermined time (30 seconds in this embodiment) (hereinafter referred to as the outside air temperature change).
A table based on ΔG is stored in advance in a predetermined area of a ROM 75 provided on the control board 58 of the indoor unit 12 for each of the cooling operation and the heating operation.

FIG. 7A shows a cooling operation FF frequency difference ΔHzff table (hereinafter referred to as cooling FF table) 150 stored in the ROM 75 in FIG. 7B.
Shows a table (hereinafter, referred to as a heating FF table) 160 of the FF frequency difference ΔHzff for the heating operation. -A ', -A, 0, + A, and + A' in each drawing are in a relationship of -A '<-A <0 <+ A <+ A', and are unique according to the outside air temperature G and the outside air temperature change ΔG. The value of any one of -A ', -A, 0, + A, and + A' is determined by the above equation (1).
Assigned to zff.

As shown in FIG. 7A, in the control of the cooling operation in the feedforward control, the higher the outside air temperature G, the larger the FF frequency difference ΔHzff, and the outside air temperature change ΔG indicates the temperature rise side (+ side). Is larger, the FF frequency difference ΔHzff becomes larger, and the FF frequency difference ΔHzf becomes larger as the outside air temperature change ΔG becomes larger on the temperature decrease side (− side).
The characteristic is that f becomes small. As shown in FIG. 7B, in the heating operation control in the feedforward control, the characteristics are completely opposite to those of the cooling operation control, that is, as the outside air temperature G increases, the FF frequency difference ΔH
zff becomes small, and the outside air temperature change ΔG
The FF frequency difference ΔHzff becomes smaller as the value increases, and the FF frequency difference ΔHzff increases as the outside air temperature change ΔG increases toward the lower temperature side (− side).

That is, during the cooling operation, the higher the outside air temperature G, the higher the cooling capacity needs to be. Therefore, the frequency of the electric power input to the compressor motor 108 is increased. In the cooling operation, the cooling capacity needs to be increased as the outside air temperature change ΔG increases toward the temperature rise side. Therefore, the frequency of the electric power input to the compressor motor 108 is increased, and as the outside air temperature change ΔG increases toward the temperature decrease side. Since it is necessary to lower the cooling capacity, the compressor motor 10
The frequency of the power input to 8 is lowered. Further, during the heating operation, the higher the outside air temperature G, the lower the heating capacity needs to be, so the frequency of the electric power input to the compressor motor 108 is lowered. In addition, during the heating operation, the heating capacity needs to be lowered as the outside air temperature change ΔG increases toward the temperature rise side. Therefore, the frequency of the electric power input to the compressor motor 108 is reduced, and as the outside air temperature change ΔG increases toward the temperature decrease side. Since it is necessary to increase the heating capacity,
The frequency of the electric power input to the compressor motor 108 is increased.

On the other hand, the FB frequency difference ΔHzfb is a value e (hereinafter, referred to as a difference) e obtained by subtracting the temperature set by the remote controller 120 from the room temperature, and a variation amount (e.g., 30 seconds in this embodiment) of the difference e. Hereinafter, it is called deviation change) Δ
The table based on e is stored in advance in a predetermined area of the ROM 75 provided on the control board 58 of the indoor unit 12 for each of the cooling operation and the heating operation.

FIG. 8A shows a cooling operation FB frequency difference ΔHzfb table (hereinafter referred to as cooling FB table) 152 stored in the ROM 75, and FIG.
Shows a table (hereinafter, referred to as a heating FB table) 162 of the FB frequency difference ΔHzfb for the heating operation. -B ', -B, 0, + B, and + B' in each drawing have a relationship of -B '<-B <0 <+ B <+ B', and are uniquely determined according to the deviation e and the deviation change Δe. Any of the values of −B ′, −B, 0, + B, and + B ′ is substituted for the FB frequency difference ΔHzfb in the above equation (1).

As shown in FIG. 8A, in the cooling operation control in the feedback control, the larger the deviation e, the larger the FB frequency difference ΔHzfb, and the larger the deviation change Δe on the temperature rising side (+ side), the larger the FB. Frequency difference ΔHzf
As the value of b increases, the deviation change Δe changes on the temperature decreasing side (−
Side), the FB frequency difference ΔHzfb decreases as the value increases. Further, as shown in FIG. 8B, in the heating operation control in the feedback control, the characteristic which is completely opposite to the above-described cooling operation control, that is, the larger the deviation e, the smaller the FB frequency difference ΔHzfb, and the deviation change. The FB frequency difference ΔHzfb decreases as Δe increases toward the temperature rise side (+ side), and the FB frequency difference ΔHzfb increases as the deviation change Δe increases toward the temperature decrease side (−side).

In other words, during the cooling operation, the larger the deviation e, the higher the cooling capacity needs to be, so the frequency of the electric power input to the compressor motor 108 is increased.
In cooling operation, the cooling capacity needs to be increased as the deviation change Δe increases toward the temperature rise side. Therefore, the frequency of the electric power input to the compressor motor 108 is increased, and the cooling performance increases as the deviation change Δe increases toward the temperature decrease side. Therefore, the frequency of the electric power input to the compressor motor 108 is lowered. Also, during the heating operation, the larger the deviation e, the lower the heating capacity needs to be.
The frequency of the electric power input to the compressor motor 108 is reduced. Further, during the heating operation, the heating capacity needs to be lowered as the deviation change Δe increases toward the temperature rise side. Therefore, the frequency of the electric power input to the compressor motor 108 is lowered, and the heating performance increases as the deviation change Δe increases toward the temperature decrease side. Needs to be high, so the compressor motor 1
08, the frequency of the power input is increased.

The microcomputer 74 corresponds to the control means of the present invention, the room temperature sensor 84 corresponds to the indoor temperature detecting means of the present invention, and the outside air temperature sensor 112 corresponds to the outside air temperature detecting means of the present invention.

Next, the operation of the present embodiment will be described with reference to FIGS. FIG. 9 shows the remote controller 1
FIG. 10 is a flowchart of a control program executed by the microcomputer 74 of the indoor unit 12 when the cooling operation is set as the operation mode by the microcomputer 20. FIG. It is a flowchart of a control program to be executed. Here, a case where both the feed forward gain FFG and the feedback gain FBG in the above equation (1) are 1 will be described. First, the operation during the cooling operation will be described with reference to FIG.

In step 200 of FIG.
Initial settings such as the setting of the frequency of the input power to the compressor motor 108 according to the difference between the set temperature by 0 and the room temperature obtained by the room temperature sensor 84, and the setting of each part according to the wind direction and air volume set by the remote controller 120 Make settings. At this time, the outside air temperature G detected by the outside air temperature detection sensor 112 and the room temperature S detected by the room temperature sensor 84 are fetched and stored in a memory (not shown) built in the microcomputer 74.

In the next step 202, the elapse of a predetermined time (30 seconds in this embodiment) is waited.
At 04, the outside air temperature G detected by the outside air temperature detection sensor 112 and the indoor temperature S detected by the room temperature sensor 84
Is stored in a memory (not shown).

In the next step 206, the outside air temperature change Δ
G, deviation e, and deviation change Δe are calculated. That is, the outside air temperature change ΔG is calculated by subtracting the previously taken outside air temperature G from the outside air temperature G currently taken in step 204. In addition, the deviation e is calculated in step 2 described above.
04 from the room temperature S taken this time by remote control 1
20 by subtracting the set temperature. Further, the deviation change Δe is calculated by subtracting the previously calculated deviation e from the deviation e calculated this time in step 206. When this step 206 is first executed, the outside air temperature stored in step 200 is applied as the previously taken outside air temperature G, and the previously calculated deviation e is stored in step 200 above. A value obtained by subtracting the temperature set by the remote controller 120 from the room temperature S is applied.

In the next step 208, the above step 20 is executed.
4 and the above-mentioned step 206
The FF frequency difference ΔHzff and the FB frequency difference ΔHzfb are respectively obtained from the cooling FF table 150 and the cooling FB table 152 stored in the ROM 75, based on the outside air temperature change ΔG, the deviation e, and the deviation change Δe calculated in the above. .

In the next step 210, the above step 20 is executed.
The target frequency Hz-ref is calculated by substituting the FF frequency difference ΔHzff and the FB frequency difference ΔHzfb obtained in step 8 and the current frequency Hz into the above equation (1). In the next step 212, the target frequency Hz-ref is input to the compressor motor 108. After setting the frequency of the power being used to be the calculated target frequency Hz-ref, the process returns to step 202.

Thereafter, steps 202 to 212 are repeatedly executed until the operation mode is set to a mode other than the cooling operation.

Next, the operation during the heating operation will be described with reference to FIG. Steps in FIG. 10 that are the same as those in FIG. 9 are assigned the same step numbers as in FIG. 9, and descriptions thereof will be omitted.

As shown in FIG. 10, the tables for obtaining the FF frequency difference ΔHzff and the FB frequency difference ΔHzfb during the heating operation and the cooling operation are the FF table 160 for heating and the FB table 162 for heating. Only the points are different.

That is, the increase or decrease of the target frequency of the input power to the compressor motor 108 during the heating operation is in a state opposite to the state during the cooling operation described above.

As described above, the air conditioner 1 according to the present embodiment
In the case of 0, the room temperature is controlled by the outside air temperature and the feedforward control based on the change in the outside air temperature in addition to the deviation between the room temperature and the set temperature and the feedback control based on the change in the outside temperature. , The adverse effect of the disturbance of the outside air temperature can be suppressed.

In this embodiment, the case where both the feedforward gain FFG and the feedback gain FBG in the above equation (1) are set to 1 has been described. However, the present invention is not limited to this.
As the feedforward gain FFG, a value indicating a characteristic of a building in which the air conditioner 10 is installed may be applied.

That is, as a characteristic of a building in which an air conditioner is installed, a heat insulation coefficient (heat loss coefficient) indicating a high degree of heat insulation is used.
And the airtightness indicating the degree of airtightness of the building, but since these values indicate the degree of influence of the outside air temperature on the room, etc., the feedforward gain FFG and the feedback gain FBG are based on these values. By setting, it becomes possible to control the room temperature more suitable for the characteristics of the building in which the air conditioner is installed.

In this embodiment, the case where the value of the feedforward term in the feedforward control and the value of the feedback term in the feedback control are obtained by table conversion has been described. However, the present invention is not limited to this. For example, the value of the feedforward term is obtained by a calculation based on the outside air temperature G and the outside air temperature change ΔG,
It may be obtained by calculation based on the deviation change Δe.

In the present embodiment, the case where each of the cooling FF table 150, the heating FF table 160, the cooling FB table 152, and the heating FB table 162 has a 3 × 3 configuration has been described. However, the present invention is not limited to this.
A configuration of × 2 or a configuration of 4 × 4 or more is also possible. In the case of a 2 × 2 configuration, the storage capacity for storing each table can be made smaller than in the present embodiment, and in the case of a 4 × 4 or more configuration, compared to this embodiment. Thus, more detailed room temperature control can be performed.

In this embodiment, the FF frequency difference Δ
Although the case where Hzff is set based on both the outside air temperature G and the outside air temperature change ΔG has been described, the present invention is not limited to this, and based on one of the outside air temperature G and the outside air temperature change ΔG. The setting may be made.

[0073]

As described above, according to the present invention,
Since the room temperature is controlled by the feedforward control based on at least one of the outside air temperature and the rate of change of the outside air temperature, even if the outside air temperature changes suddenly, it is possible to suppress the adverse effect of the disturbance of the outside air temperature. Can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an air conditioner applied to the present embodiment.

FIG. 2 is a schematic diagram showing a refrigeration cycle of an air conditioner applied to the present embodiment.

FIG. 3 is a schematic sectional view showing an indoor unit.

FIG. 4 is a block diagram schematically showing a circuit configuration of the indoor unit.

FIG. 5 is a block diagram schematically showing a circuit configuration of the outdoor unit.

FIG. 6 is a schematic diagram showing a remote control switch used for operating the air conditioner.

7A is a schematic diagram illustrating a cooling feedforward table, and FIG. 7B is a schematic diagram illustrating a heating feedforward table.

FIG. 8A is a cooling feedback table;
(B) is a schematic diagram each showing a heating feedback table.

FIG. 9 is a flowchart showing a flow of control during a cooling operation.

FIG. 10 is a flowchart illustrating a flow of control during a heating operation.

[Explanation of symbols]

 Reference Signs List 10 air conditioner (air conditioner) 12 indoor unit 14 outdoor unit 18 heat exchanger 26 compressor 30 heat exchanger 74 microcomputer (control means) 75 ROM 84 room temperature sensor (indoor temperature detecting means) 86 heat exchange temperature sensor 112 outside air temperature sensor ( Outside air temperature detecting means) 120 Remote control 150 FF table for cooling 152 FB table for cooling 160 FF table for heating 162 FB table for heating

Claims (4)

[Claims] 1. An outside air temperature detecting means for detecting an outside air temperature, and a control means for controlling an indoor temperature by feedforward control based on at least one of an outside air temperature detected by the outside air temperature detecting means and a change rate of the outside air temperature. And an air conditioner comprising: 2. An indoor temperature detecting means for detecting an indoor temperature, wherein the control means includes a deviation between an indoor temperature detected by the indoor temperature detecting means and a set temperature in addition to the feedforward control, and a deviation of the deviation. The air conditioner according to claim 1, wherein the room temperature is controlled by performing feedback control based on at least one of the change rates. 3. The cooling means increases the cooling capacity as the outside air temperature increases during the cooling operation in the feedforward control, and increases the cooling capacity when the rate of change of the outside air temperature is increasing. When the rate of change of the outside air temperature is in a downward direction, the cooling capacity is controlled to be low, and during the heating operation, the heating capacity decreases as the outside air temperature increases, and the rate of change of the outside air temperature increases. The heating capacity decreases when the temperature is increasing, and the heating capability is controlled to increase when the rate of change of the outside air temperature is decreasing. The air conditioner according to claim 2. 4. The method according to claim 1, wherein the control unit is configured to determine at least one of a value indicating a degree of heat insulation, a degree of heat loss, and a degree of airtightness of the installed building.
The air conditioner according to any one of claims 1 to 3, wherein the feedforward control is performed in consideration of the following.