JP4190098B2 - Air conditioner control device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air conditioner using a refrigeration cycle, and particularly relates to a dry operation using a cooling cycle.
[0002]
[Prior art]
As a conventional apparatus for performing a dry operation, there has been one described in Japanese Patent Laid-Open No. 10-111104.
[0003]
In this publication, during the dry operation (dry mode), the amount of air blown from the indoor fan that blows air to the conditioned room is changed based on 1 / f fluctuation, and the operating frequency of the compressor is also 1 In the air conditioner configured as described above, the dry operation is performed as follows. When the air conditioning load is larger than a predetermined value (first predetermined value), the cooling operation is performed even during the dry operation, and the air conditioning load is equal to or smaller than the first predetermined value and smaller than the first predetermined value. (The second predetermined value, the second predetermined value is set as the thermo-off point of the cooling operation) If it is equal to or higher, the dry operation is performed. The dry operation is performed at a compressor operating frequency of 20 to 30 Hz. In addition to the fluctuation in the range, the indoor fan was similarly operated based on the 1 / f fluctuation.
[0004]
[Problems to be solved by the invention]
In such a case, when the dry operation (dry mode) is performed when the set value of the room temperature (first set value) is high (for example, 27 degrees or more), the cooling operation (the dehumidifying capacity is larger than the dry operation) is sufficient. In this case, the operation shifts to a dry operation before a sufficient amount of dehumidification is obtained, and a sufficient dehumidification feeling cannot be obtained for the user.
[0005]
If the difference between the first set value and the second set value is increased so that the cooling operation time at the start of operation becomes longer, the above-described problem when the set value is high is solved. On the other hand, when the room temperature is set low (for example, 22 degrees or less) and the dry operation is performed, there is a problem that the cooling operation becomes long and the room temperature is too low.
[0006]
With respect to such problems, the present invention provides an air conditioner control device that can obtain an optimal dehumidifying effect by changing the second set value according to the situation.
[0007]
[Means for Solving the Problems]
The present invention uses a refrigeration cycle having a compressor, a condenser, a decompression device, and an evaporator, and continuously performs a cooling mode for performing cooling operation of the conditioned room and an air flow rate of cooling air supplied to the conditioned room based on time. In the control device of the air conditioner having a dry mode that increases or decreases automatically,
An operation control unit that selects the cooling mode when the deviation between the room temperature and the set temperature of the chamber to be conditioned is larger than a predetermined value and selects the dry mode when the deviation is smaller than the predetermined value;
The previous SL predetermined value, a first set value the dry mode is switched to the cooling mode the deviation up, this first low-ku said deviation is lower than the set value the cooling mode switches to the dry mode and and a second set value to set the differential,
Since the second set value of this and a correction control unit that variably set based on the room temperature and the outside temperature, in which the second set value is changed optimum dehumidifying effect is obtained depending on the situation.
[0008]
Furthermore, since the correction control unit reduces the second set value as the outside air temperature increases, the dehumidifying effect by the cooling operation can be sufficiently obtained when the outside air temperature is high.
[0009]
Further, since the correction control unit decreases the second set value as the room temperature increases, the dehumidifying effect by the cooling operation can be sufficiently obtained when the room temperature is high.
[0010]
In addition, it is equipped with an air volume correction unit that compares the humidity of the conditioned room with the set humidity and reduces the average value of the air flow rate when the humidity is high and increases it when the humidity is low. However, when the humidity is low, the cooling operation can be prioritized.
[0011]
In addition, it has a driving capacity correction unit that compares the humidity of the conditioned room with the set humidity and increases the operating capacity of the compressor when the humidity is high, and decreases it when the humidity is low. However, when the humidity is low, the cooling operation can be prioritized.
[0012]
Furthermore, since the operating capacity correction unit further sets the operating capacity of the compressor to the minimum capacity when the deviation becomes equal to or smaller than the second predetermined value, the temperature of the conditioned room is prevented from being lowered more than necessary. It is something that can be done.
[0013]
Furthermore, since the operation capacity correction unit further stops the operation of the compressor when the room temperature becomes equal to or lower than the set value, it is possible to prevent an unnecessary temperature decrease in the conditioned room.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. 1 is a refrigerant circuit diagram, 1 is a variable capacity compressor, 2 is a four-way switching valve, 3 is an outdoor heat exchanger, 4a to 4c are capillary tubes (pressure reducing devices), and 5 is a check valve (one-way valve). ), 6 is a strainer, 7 is an indoor heat exchanger, and 8 is an accumulator, which are connected in an annular shape with refrigerant piping as shown in the figure to constitute a refrigeration cycle. In addition, 9 and 10 are mufflers (silencers), 11 is a blower device (propeller fan) for the outdoor heat exchanger, and 12 is a blower device (cross flow fan) for the indoor heat exchanger. The blower 12 uses a DC brushless motor as a motor so that the amount of blown air can be varied substantially linearly.
[0015]
When the four-way switching valve 2 is in the state indicated by the solid line (shown in the figure), the high-temperature and high-pressure refrigerant discharged from the compressor 1 is condensed in the outdoor heat exchanger 3 via the muffler 9 and the four-way switching valve 2. Then, after evaporating in the indoor heat exchanger 7 through the capillary tubes 4a and 4b, the check valve 5 and the strainer 6, the solid line arrows are drawn into the compressor 1 again through the muffler 10, the four-way switching valve 2 and the accumulator 8. Cycle through the indicated refrigeration cycle.
[0016]
At this time, the refrigerant evaporates in the indoor heat exchanger 7 to perform a cooling operation (cooling mode), and the cooled air is supplied to the conditioned room by the blower 12.
[0017]
When the state of the four-way switching valve 2 is indicated by a dotted line, the high-temperature and high-pressure refrigerant discharged from the compressor 1 is condensed in the indoor heat exchanger 7 through the muffler 9, the four-way switching valve 2, and the muffler 10. A refrigeration cycle indicated by a dotted line arrow that evaporates in the outdoor heat exchanger 3 through the strainer 6, the capillary tube 4c, and the capillary tubes 4a and 4b, and then sucks into the compressor 1 again through the four-way switching valve 2 and the accumulator 8. Circulate.
[0018]
At this time, the refrigerant is condensed in the indoor heat exchanger 7 to perform a heating operation, and the heated air is supplied to the conditioned room by the blower 12.
[0019]
FIG. 2 is a schematic block diagram of a control circuit provided in the indoor unit (unit in which the indoor heat exchange 7 is mounted) of the air conditioner.
[0020]
In this figure, reference numeral 21 denotes a plug to which 100V AC power is supplied, and is connected to a 100V commercial AC power supply. This AC power is supplied to the power supply circuit 23 via the switch 22.
[0021]
Reference numeral 24 is a current fuse, 25 is a rectifier circuit, 26 is a motor power supply, 27 is a control power supply, and 28 is a serial power supply. These components constitute the power supply circuit 23.
[0022]
The current fuse 24 melts when the current supplied to the power supply circuit 23 exceeds a predetermined current to protect the circuit. The rectifier circuit 25 supplies all AC power obtained through the current fuse 24 to the circuit. The motor power circuit 26 generates a driving power for a fan motor (DC sensorless motor) 29 constituting the blower 12 and is variable between DC12V and DC48V based on a signal from a microcomputer to be described later. The control power supply 27 generates and stabilizes the drive power supply (DC5V) of the control unit 30, and the serial power supply 28 is transmitted to the outdoor unit (in which the outdoor heat exchanger 3 is mounted). This is a circuit for sharing a common line with AC power for supplying a signal to the outdoor unit.
[0023]
Reference numeral 31 denotes a terminal plate. The first terminal, the second terminal, and the third terminal are provided on a resin-made terminal block, and a temperature fuse 32 that melts at a predetermined temperature or more and opens a circuit is provided on the terminal block. It is attached so that the temperature, that is, the temperature of the terminal board 13 can be detected.
[0024]
A normally open contact piece 37 of the power relay 36 is interposed between the first terminal of the terminal board 31 and the plug 21, and the normally open contact piece 37 is closed by the output of the microcomputer 33 (the driver is not shown). The output of AC power from 31 is controlled. The second terminal of the terminal board 31 is connected to the plug 21 and is a common line with the third terminal (signal output terminal).
[0025]
The third terminal is a terminal for outputting a signal output from the microcomputer 33 via the serial circuit 28 a and the serial power supply 28.
[0026]
In addition, the 1st terminal-3rd terminal of the terminal board 11 is connected so that the same terminal number may connect with the terminal board of the electric circuit mounted in the outdoor unit of FIG. 2 mentioned later.
[0027]
The thermal fuse 32 is inserted into the drive line of the power relay 36, and when the temperature of the terminal board 31 rises, the normally open contact piece 37 is opened to interrupt the supply of AC power to the outdoor unit.
[0028]
Reference numeral 39 denotes a wireless remote controller which performs various settings such as operation control of the air conditioner and setting of a set temperature and selection of functions based on the operation of the switch, and the operation signal is provided on the display board 40. Sent to the receiving circuit. The microcomputer 33 receives this operation signal and controls the operation of the air conditioner. The display board 40 displays the operation state of the air conditioner (operation mode such as cooling / heating / drying, set temperature, room temperature, etc.).
[0029]
Reference numeral 41 denotes a switch board, which is provided with switches for services such as the switch 22 and a test operation switch.
[0030]
Reference numeral 42 denotes a flap motor, which controls the angle of the flap to change the discharge direction of air conditioned by the indoor unit into the room.
[0031]
Reference numeral 43 denotes an external ROM which stores an initial setting value of the microcomputer 33.
[0032]
Reference numerals 44 and 45 denote a temperature sensor for detecting indoor temperature and a humidity sensor for detecting indoor humidity, which are connected to the A / D input terminal of the microcomputer 33. The microcomputer 33 is based on the detected temperature and humidity. It controls the operation of the air conditioner.
[0033]
A motor drive circuit 47 has an inverter circuit in which switching elements are connected in a three-phase bridge shape, and switches the output of the inverter circuit in accordance with the rotational position of the rotor of the fan motor 29. A signal for switching the output of the inverter circuit is output from the microcomputer 33.
[0034]
FIG. 3 is a block diagram showing an outline of a control circuit mounted on the outdoor unit, and is connected to the terminal board 31 shown in FIG.
[0035]
In this figure, reference numeral 52 denotes a power supply circuit, which doubles voltage 100% AC power from an indoor unit obtained through the first terminal and the second terminal of the terminal board 51 and smoothes it. The DC power output from the power supply circuit 52 is output to an inverter circuit 53 in which switching elements are connected in a three-phase bridge shape, so that three-phase AC (when the compressor 1 uses an induction motor) or rotation After being converted into a waveform capable of energizing the stator winding corresponding to the rotational position of the child (when the compressor 1 uses a DC brushless motor), it is supplied to the compressor 1.
[0036]
A microcomputer 55 receives a control signal from the microcomputer 33 of the indoor unit via the third terminal of the terminal board 51 and the serial circuit 56, and mainly switches the rotation speed of the compressor 1, the switching of the four-way switching valve 2, and the blower device 11. It controls the operation of the fan motor that drives the propeller fan.
[0037]
57 is an outside air temperature sensor that detects the temperature of the outside air, and the outside air temperature detected by this sensor is transmitted to the microcomputer 33 of the indoor unit.
[0038]
FIG. 4 is an explanatory diagram showing the relationship between the predetermined value, the cooling operation (cooling mode), and the dry mode, and shows a part of the operation of the microcomputer 33 (the operation of the operation control unit). If the room temperature deviation (difference between room temperature and set temperature) is e, the first predetermined value is a value of +1 degree, and the second predetermined value X is a variable value calculated with reference to FIG. The third predetermined value is 15 degrees as an example.
[0039]
There is a relationship of the first predetermined value> the second predetermined value between the first predetermined value and the second predetermined value, and the difference between these predetermined values is used as a differential for switching between the cooling mode and the dry mode. Is set.
[0040]
Therefore, when the room temperature deviation e is greater than 1, cooling operation (cooling mode) is performed, and when the room temperature deviation e is smaller than 1, the dry mode is entered, but switching from the cooling mode to the dry mode is performed when the room temperature deviation e is indicated by an arrow 61. When the temperature drops to the second set value, the dry mode is switched to the cooling mode when the room temperature deviation rises to the first set value as indicated by an arrow 62.
[0041]
In the dry mode, the microcomputer 33 operates the compressor 1 with the operation capability Hz calculated based on the room temperature deviation e and the change Δe of the deviation e so that the room temperature deviation e becomes 0, The number of rotations (air flow rate) of the fan motor 29 of the blower 12 is continuously increased or decreased with an increase / decrease pattern having the characteristic / f. Since the cooling mode uses a normal cooling operation, the description is omitted.
[0042]
The increase / decrease pattern is configured such that the average value (center rotational speed) can be increased / decreased by the air flow rate correction unit. The operation is performed by raising the value of the increase / decrease pattern stored in the microcomputer 33 in correspondence with the elapsed time.
[0043]
The B zone is a range when the room temperature deviation e is less than or equal to the second predetermined value, the compressor operating capacity Hz is set to the minimum capacity, and the fan motor 29 is controlled in the same manner as in the dry mode.
[0044]
The monitoring zone is a zone further set in the B zone, and the specified condition “room temperature is equal to or lower than a third predetermined value” is added. In this monitoring zone, the operation of the compressor is stopped, and the fan motor 29 is controlled in the same manner as in the dry mode.
[0045]
FIG. 5 is an explanatory diagram of the correction control unit for setting the second predetermined value X, which is calculated and set by the microcomputer 33 based on the room temperature and the outside air temperature. The values of the room temperature T1 to T3 and the outside air temperatures To1 to To3 are set in order in the range of about 22 degrees to 33 degrees, and are set according to the operating capacity of the compressor 1 and the conditions of the conditioned room to be assumed. It is not limited to this.
[0046]
As shown in FIG. 5, the second predetermined value X is divided into zone 1 to zone 5 based on room temperature T1 to T3 and outside temperature To1 to To3. In zone 1, X = -3, and in zone 2, X = −. 1. X = -2 in Zone 3, X = -1 in Zone 4, X = -1 in Zone 5, but is not limited to this. It may be corrected.
[0047]
The second predetermined value X may be calculated simply based on room temperature / outside temperature, for example, X = − (4 × outside temperature) / 5 + 21, where X is −1 to −3. An integer not exceeding X = − (4 × room temperature) / 5 + 21, X is an integer not exceeding −1 to −3.
[0048]
In this case, since the second set value X is a linear function, preferential treatment in a specific temperature range cannot be performed, but this does not greatly depart from the gist of the present invention, and the effects of the present invention can be obtained with a simple configuration. It is what In order to increase the control accuracy, a high-order function such as a quadratic function may be used, and a plurality of zoning conditions may be set.
[0049]
FIG. 6 is an explanatory diagram of an operation capacity airflow correction unit that corrects the operation capacity of the compressor 1 and the average rotation speed of the fan motor 29 based on humidity.
[0050]
63 shows the characteristic of the correction value of the operating capacity of the compressor 1, 64 shows the characteristic of the correction value of the average rotation speed of the fan motor 29, and the characteristic 63 increases the operating capacity of the compressor 1 as the humidity increases. Such correction is performed. When the humidity is high, the operating capacity of the compressor 1 is increased and at the same time the dehumidifying capacity is increased.
[0051]
In the characteristic 64, correction is performed so as to decrease the rotation of the fan motor 29 as the humidity increases. When the humidity is high, the rotational speed of the fan motor decreases and the evaporation temperature of the indoor heat exchanger 7 decreases and the dehumidifying capacity increases.
[0052]
In addition, if the correction | amendment of the driving capability of the compressor 1 and the correction | amendment of the rotation speed of the fan motor 29 are performed simultaneously, the dehumidification capability at the time of high humidity will increase more. When the humidity is low, the operating capacity of the compressor 1 is lowered and the rotational speed of the fan motor 29 is increased at the same time, so that cold air that does not become too low in temperature is supplied to the conditioned room, thereby suppressing a decrease in room temperature. become.
[0053]
Further, the settings of the characteristics 63 and 64 are not limited to this, and are appropriately set.
[0054]
When the operation of the air conditioner configured as described above is started, first, a room temperature deviation e between the set value of the room temperature and the room temperature is obtained. If this room temperature deviation e is larger than the first predetermined value, the four-way switching valve 2 is set to the state shown in FIG. 1 and the cooling operation is started in the cooling mode.
[0055]
If the second set value <the room temperature deviation e <the first set value, the dry mode is set, and the above-described dry mode operation is performed. In these operations, the operation capability Hz of the compressor 1 is calculated by performing fuzzy calculation or the like based on the room temperature deviation e and the change Δe. Thereafter, these operations are repeated at predetermined intervals.
[0056]
If the room temperature deviation e is less than or equal to the second predetermined value at the start of operation of the air conditioner, the operation capacity Hz of the compressor 1 is fixed to the minimum value, and the dry mode operation is performed. When the value reaches a predetermined value of 3 or less, the compressor 1 is stopped and only the air blowing operation by the 1 / f pattern is performed.
[0057]
When the operation of the air conditioner is started in the cooling mode, the cooling operation is continued until the room temperature deviation e drops to the second predetermined value. When the room temperature deviation e reaches the second predetermined value, the cooling mode is switched to the dry mode, and this dry mode is maintained until the room temperature deviation e increases to the first predetermined value. When the room temperature deviation e becomes equal to or smaller than the second predetermined value in this dry mode, the operation is switched to the operation of the B zone (the operation capacity of the compressor 1 is fixed to the minimum value).
[0058]
When operating in the dry mode, the humidity in the conditioned room is detected, and the operating capability Hz of the compressor 1 and the average rotational speed of the fan motor 29 are corrected based on this humidity. The operating capacity Hz of the compressor 1 is positively corrected as the humidity increases as indicated by a characteristic 63 in FIG. 6, and the average rotation speed of the fan motor 29 is negatively corrected as the humidity increases as indicated by a characteristic 64 in FIG. 6. To do.
[0059]
Thereafter, the cooling operation, the dry mode, and the B zone are automatically switched by comparing the room temperature deviation e with the first predetermined value and the second predetermined value. At this time, since the second predetermined value automatically changes based on the room temperature and the outside temperature, the maintenance range of the cooling operation (the maintenance range of the dry mode) is changed, and when the outside temperature and the room temperature are high, the cooling time is changed. A longer operation is performed with priority given to cooling, and when the outside air temperature and room temperature are low, the cooling time is shortened and the operation giving priority to dehumidification is performed.
[0060]
【The invention's effect】
As described above, according to the present invention, the predetermined value used for switching between the cooling mode and the dry mode includes the first setting value having a differential and the second setting value lower than the first setting value. Because it has a correction control unit that variably sets the set value of 2 based on room temperature and outside air temperature, it can maintain a comfortable operating state by changing the cooling mode maintenance time according to the conditions of room temperature and outside air temperature It is.
[0061]
Further, since the dehumidification amount of the air conditioner can be controlled by changing the operation capacity of the compressor and the blowing amount of the blower based on the humidity, the dehumidifying operation according to the humidity condition can be performed.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing a refrigeration cycle of an air conditioner showing one embodiment of the present invention.
FIG. 2 is a block diagram showing an electric circuit of the indoor unit of the air conditioner shown in FIG.
FIG. 3 is a block diagram showing an electric circuit of the outdoor unit of the air conditioner shown in FIG. 1;
FIG. 4 is an explanatory diagram showing switching between a cooling mode and a dry mode.
FIG. 5 is an explanatory diagram showing setting of a second setting value.
FIG. 6 is an explanatory diagram showing correction of compressor operating capacity and fan motor rotation speed.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Compressor 3 Outdoor heat exchanger 4a, 4b, 4c Capillary tube 7 Indoor heat exchanger 12 Blower 29 Fan motor

Claims (7)

Using a refrigeration cycle with a compressor, a condenser, a decompressor, and an evaporator, the cooling mode for cooling the conditioned room and the amount of cooling air supplied to the conditioned room are continuously increased or decreased based on time. In an air conditioner control device comprising a dry mode,
An operation control unit that selects the cooling mode when the deviation between the room temperature and the set temperature of the chamber to be conditioned is larger than a predetermined value and selects the dry mode when the deviation is smaller than the predetermined value;
The previous SL predetermined value, a first set value the dry mode is switched to the cooling mode the deviation up, this first low-ku said deviation is lower than the set value the cooling mode switches to the dry mode and and a second set value to set the differential,
Control device for an air conditioner characterized by comprising a correction control unit that variably set based on the room temperature and outdoor temperature with a second set value of this.   The control device for an air conditioner according to claim 1, wherein the correction control unit decreases the second set value as the outside air temperature increases.   The control apparatus for an air conditioner according to claim 1, wherein the correction control unit decreases the second set value as the room temperature increases.   2. A blast volume correction unit that compares the humidity of the conditioned room with a set humidity, decreases an average value of the blast volume when the humidity is high, and increases the blast volume when the humidity is low. The control apparatus of the air conditioner of Claim thru | or 3.   2. An operating capacity correction unit that compares the humidity of the conditioned room with a set humidity and increases the operating capacity of the compressor when the humidity is high and decreases the humidity when the humidity is low. Or the control apparatus of the air conditioner of Claim 4.   6. The air conditioner control device according to claim 5, wherein the operating capacity correction unit further sets the operating capacity of the compressor to a minimum capacity when the deviation becomes equal to or less than a second predetermined value. .   The air conditioner control device according to claim 6, wherein the operation capability correction unit further stops the operation of the compressor when the room temperature becomes equal to or lower than a third set value.

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