JP2018071886A - air conditioner - Google Patents

Abstract

An air conditioner capable of adjusting a room temperature to a target temperature quickly and accurately at the start of operation or the like is provided. An air conditioner 100 includes a refrigerant circuit including an inverter-driven compressor 11, an indoor temperature sensor 32 that measures a room temperature of an air-conditioning target space, a storage unit 210 that stores a room temperature target temperature, and air conditioning is insufficient. And a compressor control unit 220 that controls the frequency of the compressor so that the frequency decreases as the room temperature approaches the target temperature from the operating state. The compressor control unit has a plurality of frequency reduction patterns. The compressor control unit controls the frequency of the compressor at the start of the adjustment mode operation by using a predetermined frequency reduction pattern determined at the previous operation. The compressor control unit uses the same frequency reduction pattern as the start of the most recent predetermined operation at the start of the next predetermined operation based on the information on the change in the room temperature, or at the start of the most recent predetermined operation. Determines whether to use a different frequency reduction pattern. [Selection] Figure 3

Description

  The present invention relates to an air conditioner, and more particularly to an air conditioner including an inverter-driven compressor.

  Conventionally, an air conditioner using an inverter-driven compressor, in order to prevent the room temperature from being excessively adjusted (for example, to prevent overcooling during cooling), the room temperature approaches the target temperature. Accordingly, an air conditioner that reduces the frequency of the compressor is known (for example, during cooling, as the room temperature decreases from a relatively high state to a target temperature).

  For example, the cited document 1 (Japanese Patent Application Laid-Open No. 2014-190600) has a table in which the temperature difference between the room temperature and the target temperature is associated with the frequency of the compressor, and the compressor is operated at a frequency corresponding to the temperature difference. Is disclosed. Also, in Cited Document 1 (Japanese Patent Laid-Open No. 2014-190600), another table in which the differential temperature and the frequency of the compressor are linked (a table that reduces the frequency of the compressor more quickly when the differential temperature becomes smaller) is prepared. It is disclosed that when the compressor is started after the thermo-off, the thermo-on / off frequency is reduced by operating the compressor using this table.

  However, although the air conditioner of Cited Document 1 (Japanese Patent Application Laid-Open No. 2014-190600) can reduce the number of times of thermo-on / off, the viewpoint of adjusting the room temperature to the target temperature quickly and accurately at the start of the operation of the air conditioner, etc. There is room for improvement.

  An object of the present invention is to provide an air conditioner capable of quickly and accurately adjusting a room temperature to a target temperature at the start of operation.

  An air conditioner according to a first aspect of the present invention includes a refrigerant circuit, a measurement unit, a storage unit, and a frequency control unit. The refrigerant circuit includes an inverter-driven compressor. The measurement unit measures the room temperature of the air conditioning target space. The storage unit stores a target temperature of room temperature. The frequency control unit controls the frequency of the compressor so that the room temperature measured by the measurement unit decreases as the temperature approaches the target temperature from a state where air conditioning is insufficient. The frequency control unit has a plurality of frequency reduction patterns. The frequency control unit controls the frequency of the compressor using a predetermined frequency reduction pattern determined at the previous operation at the start of the predetermined operation. The frequency control unit uses the same frequency reduction pattern as the start of the most recent predetermined operation at the start of the next predetermined operation based on the information related to the change in the room temperature, or the start of the most recent predetermined operation Determine whether to use a different frequency reduction pattern.

  Here, the state where air conditioning is insufficient means a state where the room temperature is higher than the target temperature during cooling, and a state where the room temperature is lower than the target temperature during heating.

  Here, the information on the change in the room temperature is not limited to the information on the change in the room temperature itself, but the information on the change in the value related to the change in the room temperature, for example, the frequency of the compressor caused by the change in the room temperature. It may be change information.

  In the air conditioner according to the first aspect of the present invention, a plurality of frequency reduction patterns of the compressor used when the room temperature approaches the target temperature from a state where air conditioning is insufficient is prepared. And here, based on the information on the change in room temperature during operation, at the start of the next predetermined operation, the frequency reduction pattern used at the start of the most recent predetermined operation is used, or another frequency reduction pattern is used. It is decided whether to use. That is, this air conditioner learns the frequency control of the compressor suitable for air conditioning the air-conditioning target space based on the actual operation, and performs the frequency control of the compressor reflecting the learning result. Therefore, in this air conditioner, the room temperature can be adjusted to the target temperature quickly and accurately at the start of operation.

  The air conditioner according to the second aspect of the present invention is the air conditioner according to the first aspect, and the frequency control unit is based on the time from the start of the predetermined operation until the room temperature reaches the target temperature next time. At the start of the predetermined operation, the same frequency reduction pattern as at the start of the most recent predetermined operation is used, or the frequency reduction pattern of the compressor is suppressed more than the frequency reduction pattern used at the start of the most recent predetermined operation. Decide whether to use a frequency reduction pattern.

  The air conditioner according to the second aspect of the present invention determines the capacity shortage of the air conditioner based on the time from the start of the predetermined operation until the room temperature reaches the target temperature, and the compressor frequency is determined according to the determination result. The frequency reduction pattern that suppresses the reduction is used at the start of the next predetermined operation. Therefore, in this air conditioner, the room temperature can be quickly adjusted to the target temperature at the start of operation or the like based on the environment of the air conditioning target space.

  The air conditioner according to the third aspect of the present invention is the air conditioner according to the first aspect or the second aspect, and the frequency control unit is based on information on a change in the room temperature after the room temperature reaches the target temperature. At the start of the next predetermined operation, use the same frequency reduction pattern as at the start of the last predetermined operation, or promote the reduction of the compressor frequency than the frequency reduction pattern used at the start of the most recent predetermined operation It is determined whether to use the reduced frequency pattern.

  The air conditioner according to the third aspect of the present invention determines the excess capacity of the air conditioner based on the information on the change in the room temperature after reaching the target temperature, and promotes the reduction of the compressor frequency according to the determination result. The pattern is used at the start of the next predetermined operation. Therefore, in the present air conditioner, the room temperature can be accurately adjusted to the target temperature without causing thermo-off or hunting at the start of operation or the like based on the environment of the air-conditioning target space.

  An air conditioner according to a fourth aspect of the present invention is the air conditioner according to any one of the first aspect to the fourth aspect, and is reduced each time the room temperature approaches the target temperature in the plurality of frequency reduction patterns. The frequency of the compressor is different.

  Since the air conditioner according to the fourth aspect of the present invention has a plurality of frequency reduction patterns having different frequency reduction modes, the room temperature of the air-conditioning target space can be accurately controlled.

  In the air conditioner according to the first aspect of the present invention, a plurality of frequency reduction patterns of the compressor used when the room temperature approaches the target temperature from a state where air conditioning is insufficient is prepared. And here, based on the information on the change in room temperature during operation, at the start of the next predetermined operation, the frequency reduction pattern used at the start of the most recent predetermined operation is used, or another frequency reduction pattern is used. It is decided whether to use. That is, this air conditioner learns the frequency control of the compressor suitable for air conditioning the air-conditioning target space based on the actual operation, and performs the frequency control of the compressor reflecting the learning result. Therefore, in this air conditioner, the room temperature can be adjusted to the target temperature quickly and accurately at the start of operation.

  In the air conditioner according to the second aspect of the present invention, the room temperature can be quickly adjusted to the target temperature at the start of operation or the like based on the environment of the air conditioning target space.

  In the air conditioner according to the third aspect of the present invention, the room temperature can be accurately adjusted to the target temperature without causing thermo-off or hunting at the start of operation or the like based on the environment of the air-conditioning target space.

  Since the air conditioner according to the fourth aspect of the present invention has a plurality of frequency reduction patterns with different frequency reduction modes, the room temperature of the air-conditioning target space can be accurately controlled.

It is a perspective view which shows the external appearance of the air conditioner which concerns on one Embodiment of this invention. It is a figure which shows the outline | summary of a structure of the air conditioner of FIG. It is a block diagram of the air conditioner of FIG. It is an example of the some frequency reduction pattern which the compressor control part of the air conditioner of FIG. 1 has. 2 is a flowchart for explaining control of a frequency of a compressor during cooling and determination processing of a frequency reduction pattern used by a compressor control unit at the start of an adjustment mode operation of the air conditioner in the air conditioner of FIG. 1. Steps S1 to S9 are shown. 2 is a flowchart for explaining control of a frequency of a compressor during cooling and determination processing of a frequency reduction pattern used by a compressor control unit at the start of an adjustment mode operation of the air conditioner in the air conditioner of FIG. 1. Steps S10 to S14 are shown.

  Hereinafter, an air conditioner 100 according to an embodiment of the present invention will be described with reference to the drawings. In addition, the following embodiment is only an illustration and can be changed suitably in the range which does not deviate from the meaning of this invention.

(1) Overall Overview The air conditioner 100 according to an embodiment of the present invention is a device that cools and heats a space to be air-conditioned. However, the air conditioner is not limited to a device that performs both cooling and heating, and may be a device that can execute only one of them.

  The air conditioner 100 includes an air conditioner indoor unit 1 installed in a room that is a space to be air conditioned and an air conditioner outdoor unit 2 installed outdoors (see FIG. 1). The air conditioning indoor unit 1 and the air conditioning outdoor unit 2 are connected by a communication pipe 3 (see FIG. 1). Here, the air conditioning indoor unit 1 is a wall-hanging type, but is not limited to this, and may be a wall-embedded type, a ceiling-embedded type, a floor-mounted type, or the like.

  The air conditioning indoor unit 1 mainly includes an indoor heat exchanger 16, an indoor fan 31, an indoor temperature sensor 32, and an indoor side control unit 34 (see FIG. 2). The air conditioning outdoor unit 2 mainly includes a compressor 11, a four-way switching valve 12, an outdoor heat exchanger 13, an expansion mechanism 14, an accumulator 15, an outdoor fan 21, and an outdoor control unit 24 (see FIG. 2).

  In the air conditioner 100, the air conditioner indoor unit 1 and the air conditioner outdoor unit 2 are connected by a communication pipe 3 (a liquid refrigerant communication pipe 3a and a gas refrigerant communication pipe 3b), thereby forming a refrigerant circuit 10 (FIG. 2). reference). The refrigerant circuit 10 mainly includes a compressor 11, a four-way switching valve 12, an outdoor heat exchanger 13, an expansion mechanism 14, an indoor heat exchanger 16, and an accumulator 15 (see FIG. 2). When the refrigerant circulates in the refrigerant circuit 10, a vapor compression refrigeration cycle is performed in the air conditioner 100.

  The indoor side control unit 34 of the air conditioning indoor unit 1 and the outdoor side control unit 24 of the air conditioning outdoor unit 2 are communicably connected to each other, and cooperate to control the operation of each unit of the air conditioner 100. It functions as the unit 200 (see FIG. 2).

(2) Detailed configuration (2-1) Air-conditioned indoor unit The air-conditioned indoor unit 1 is installed in a room that is an air-conditioning target space.

  The air conditioning indoor unit 1 mainly includes an indoor heat exchanger 16, an indoor fan 31, an indoor temperature sensor 32, and an indoor side control unit 34 (see FIG. 2).

  The indoor heat exchanger 16 is a cross-fin type fin-and-tube heat exchanger composed of heat transfer tubes and heat transfer fins. In the indoor heat exchanger 16, heat is exchanged between the indoor air and the refrigerant flowing through the heat transfer tubes. The indoor heat exchanger 16 functions as a refrigerant evaporator during cooling operation to cool indoor air. The indoor heat exchanger 16 functions as a refrigerant condenser during heating operation to heat indoor air. The liquid side of the indoor heat exchanger 16 is connected to the liquid refrigerant communication pipe 3a of the communication pipe 3, and the gas side of the indoor heat exchanger 16 is connected to the gas refrigerant communication pipe 3b of the communication pipe 3 (see FIG. 2). ).

  The indoor fan 31 is driven by a fan motor (not shown), takes in indoor air and blows it to the indoor heat exchanger 16, and promotes heat exchange between the refrigerant and the indoor air in the indoor heat exchanger 16.

  The indoor temperature sensor 32 is a thermistor as a measuring unit that measures the room temperature of the air-conditioning target space where the air-conditioning indoor unit 1 is installed. A signal corresponding to the temperature measured by the indoor temperature sensor 32 is transmitted to the indoor side control unit 34.

  The indoor side control unit 34 includes a CPU and a memory (not shown). The indoor side control part 34 controls the operation | movement of each part of the air conditioning machine 100, mainly the operation | movement of each part of the air conditioning indoor unit 1 by executing the program memorize | stored in memory. The indoor side control unit 34 is electrically connected to devices such as the indoor fan 31 included in the air conditioning indoor unit 1. The indoor-side control unit 34 also includes an indoor temperature sensor 32 for measuring the room temperature of the air-conditioning target space, an indoor heat exchanger temperature sensor (not shown) for measuring the temperature of the indoor heat exchanger 16, and electricity. Connected. Further, the indoor side control unit 34 commands from the remote controller (not shown) operated by the user of the air conditioner 100 to operate / stop the air conditioner 100, switch the operation of the air conditioner 100 (switching between cooling / heating), and the like. Receive. Further, the indoor side control unit 34 is communicably connected to the outdoor side control unit 24 of the air conditioner outdoor unit 2, and controls the operation of each component of the air conditioner 100 in cooperation with the outdoor side control unit 24. It functions as the control unit 200. The control unit 200 will be described separately.

(2-2) Air-conditioning outdoor unit The air-conditioning outdoor unit 2 is installed outdoors.

  The air conditioning outdoor unit 2 mainly includes a compressor 11, a four-way switching valve 12, an outdoor heat exchanger 13, an expansion mechanism 14, an accumulator 15, an outdoor fan 21, and an outdoor control unit 24 (see FIG. 2).

  The compressor 11, the four-way switching valve 12, the outdoor heat exchanger 13, the expansion mechanism 14, and the accumulator 15 are connected by a refrigerant pipe. Specifically, the suction port of the compressor 11 and the four-way switching valve 12 are connected by a suction pipe 41. The suction pipe 41 is provided with an accumulator 15. The discharge port of the compressor 11 and the four-way switching valve 12 are connected by a discharge pipe 42. The four-way switching valve 12 and the gas side of the outdoor heat exchanger 13 are connected by a first gas refrigerant pipe 43. The outdoor heat exchanger 13 and the liquid refrigerant communication pipe 3 a are connected by a liquid refrigerant pipe 44. The liquid refrigerant pipe 44 is provided with an expansion mechanism 14. The four-way switching valve 12 and the gas refrigerant communication pipe 3 b are connected by a second gas refrigerant pipe 45.

  The compressor 11 drives a compression mechanism (not shown) by a motor (not shown) to compress the refrigerant. The compressor 11 is, for example, a rotary compressor. However, the type of the compressor 11 is not limited to the rotary compressor, and may be another type of compressor such as a scroll compressor. The compressor 11 is a frequency-variable inverter-driven compressor. The compressor 11 sucks the refrigerant from the suction pipe 41 and discharges the high-temperature and high-pressure gas refrigerant compressed by a compression mechanism (not shown) to the discharge pipe 42.

  As described above, the suction pipe 41 is provided with the accumulator 15 that separates the gas-liquid two-phase refrigerant into the gas-phase refrigerant and the liquid-phase refrigerant. By providing the accumulator 15 in the suction pipe 41, a gas-phase refrigerant is mainly supplied to the compressor 11.

  The four-way switching valve 12 switches the flow direction of the refrigerant when the air conditioner 100 is switched between the cooling operation and the heating operation. During the cooling operation, the four-way switching valve 12 connects the discharge pipe 42 and the first gas refrigerant pipe 43 and also connects the suction pipe 41 and the second gas refrigerant pipe 45 (four-way switching valve 12 in FIG. 2). (See the solid line inside.) On the other hand, during the heating operation, the four-way switching valve 12 connects the discharge pipe 42 and the second gas refrigerant pipe 45 and connects the suction pipe 41 and the first gas refrigerant pipe 43 (four-way switching valve in FIG. 2). (See broken line in valve 12).

  The outdoor heat exchanger 13 is a cross-fin type fin-and-tube heat exchanger composed of heat transfer tubes and heat transfer fins. In the outdoor heat exchanger 13, heat exchange is performed between the outdoor air and the refrigerant flowing through the heat transfer tubes. The outdoor heat exchanger 13 functions as a refrigerant condenser during the cooling operation, and functions as a refrigerant evaporator during the heating operation.

  The outdoor fan 21 is driven by a fan motor (not shown) and takes outdoor air into the air-conditioning outdoor unit 2. The outdoor air taken into the air-conditioning outdoor unit 2 passes through the outdoor heat exchanger 13 and is then discharged out of the air-conditioning outdoor unit 2. The outdoor fan 21 promotes heat exchange between the refrigerant and the outdoor air in the outdoor heat exchanger 13.

  The expansion mechanism 14 is an electric expansion valve having a variable opening degree that is provided to adjust the pressure and flow rate of the refrigerant flowing through the refrigerant circuit 10.

  The outdoor side control part 24 has CPU and memory which are not shown in figure. The outdoor side control part 24 controls the operation | movement of each part of the air conditioner 100, mainly the operation | movement of each part of the air-conditioning outdoor unit 2 by running the program memorize | stored in memory. The outdoor control unit 24 is electrically connected to devices such as the compressor 11, the four-way switching valve 12, the expansion mechanism 14, and the outdoor fan 21 that the air-conditioning outdoor unit 2 has. The outdoor control unit 24 also includes an outdoor temperature sensor (not shown) for measuring the temperature of the outdoor air and an outdoor heat exchanger temperature sensor (not shown) for measuring the temperature of the outdoor heat exchanger 13. ), And a discharge temperature sensor (not shown) provided in the discharge pipe 42. Further, the outdoor side control unit 24 is communicably connected to the indoor side control unit 34 of the air conditioning indoor unit 1, and controls the operation of each unit of the air conditioner 100 in cooperation with the indoor side control unit 34. It functions as the unit 200. The control unit 200 will be described separately.

(2-3) Control Unit The control unit 200 includes the outdoor side control unit 24 and the indoor side control unit 34, and controls the operation of each unit of the air conditioner 100.

  The control unit 200 responds to a command transmitted from a remote controller (not shown) or an air conditioning load (for example, a temperature difference between room temperature and a target temperature (set temperature) input from the remote controller). Each part of the air conditioning outdoor unit 2 is controlled.

  Below, control of the frequency of the compressor 11 at the time of cooling / heating among functions of the control unit 200 will be described.

  The control unit 200 includes a compressor control unit 220 as a functional unit related to frequency control of the compressor 11. The storage unit 210 that stores various types of information includes a target temperature storage area 210a and a next-time pattern storage area 210b as storage areas for storing information related to frequency control of the compressor 11.

(2-3-1) Target temperature storage area The target temperature storage area 210a is a storage area for storing a room temperature target temperature (set temperature) of an air-conditioning target space input from a remote controller (not shown). When the target temperature is changed via the remote controller, the value stored in the target temperature storage area 210a is rewritten.

(2-3-2) Next Pattern Storage Area The next pattern storage area 210b is a storage area for storing a frequency reduction pattern used at the start of the next adjustment mode operation, which is determined by the compressor control unit 220 described later. The adjustment mode operation and the frequency reduction pattern will be described later together with the description of the compressor control unit 220.

(2-3-3) Compressor Control Unit The compressor control unit 220 performs operation / stop of the inverter-driven compressor 11 and frequency control according to a command from a remote controller (not shown), an air conditioning load, and the like. .

  The compressor controller 220 controls the compressor 11 in the following manner when the air conditioner 100 is activated and cooling or heating is performed. Here, when the air conditioner 100 is activated, the air conditioning is insufficient (the room temperature is higher than the target temperature during cooling, and the room temperature is lower than the target temperature during heating). It is assumed that the room temperature of the target space is somewhat different from the target temperature. Here, the room temperature of the air-conditioning target space at the time of activation of the air conditioner 100 is higher by α ° C., which will be described later, with respect to the target temperature of the room temperature when cooling, and will be described later with respect to the target temperature of room temperature when heating. It shall be lower by β ° C or more. Here, for the sake of simplicity of explanation, it is assumed that the operation is not switched from cooling to heating or vice versa after the operation of the air conditioner 100 is started, or the target temperature is not changed midway.

  When the air conditioner 100 is activated, the compressor control unit 220 increases the frequency of the compressor 11 stepwise up to a predetermined frequency (for example, up to the maximum operating frequency). During cooling, the compressor controller 220 determines a predetermined frequency until the room temperature measured by the room temperature sensor 32 decreases to (target temperature + α ° C.) (for example, decreases to (target temperature + 2 ° C.)). To maintain. During heating, the compressor controller 220 determines that the room temperature measured by the room temperature sensor 32 rises to (target temperature−β ° C.) (for example, rises to (target temperature−2 ° C.)). Maintain a predetermined frequency. Note that the values of α and β listed here are not limited to the exemplified values. Further, the values of α and β may be the same value or different values.

  When the room temperature measured by the room temperature sensor 32 is lowered to (target temperature + α ° C.) during cooling, the adjustment mode operation of the air conditioner 100 is started. Further, when the room temperature measured by the room temperature sensor 32 rises to (target temperature−β ° C.) during heating, the adjustment mode operation of the air conditioner 100 is started. During the adjustment mode operation of the air conditioner 100, the compressor control unit 220 compresses the room temperature measured by the room temperature sensor 32 so that the frequency decreases as the air temperature is insufficient and approaches the target temperature. The frequency of the machine 11 is controlled.

  The compressor control unit 220 has a plurality of frequency reduction patterns as patterns of the frequency reduction mode of the compressor 11 used at least at the start of the adjustment mode operation. The compressor control unit 220 has, for example, five frequency reduction patterns shown in FIG. 4 as a plurality of frequency reduction patterns. In these five frequency reduction patterns, the magnitude of the frequency of the compressor that is reduced each time the room temperature approaches the target temperature is different. The unit temperature is not limited, but is 0.5 degrees, for example. Each of the first pattern, the second pattern, the third pattern, the fourth pattern, and the fifth pattern in FIG. 4 includes the compressor 11 by A1, A2, A3, A4, and A5 each time the room temperature approaches the target temperature. This is a frequency reduction pattern for reducing the frequency of. The unit of A1 to A5 is rpm. A1 to A5 have a relationship of A1 <A2 <A3 <A4 <A5. That is, in the first pattern, the second pattern, the third pattern, the fourth pattern, and the fifth pattern, the frequency of the compressor 11 that is reduced every time the room temperature approaches the target temperature in this order increases. In other words, in the first pattern, the second pattern, the third pattern, the fourth pattern, and the fifth pattern, the reduction in the frequency of the compressor 11 that is reduced every time the room temperature approaches the target temperature in this order is promoted. The

  The number of the plurality of frequency reduction patterns need not be five, but may be four or less, or six or more. Moreover, the compressor control part 220 may have a plurality of frequency reduction patterns for cooling and a plurality of frequency reduction patterns for heating different from those for cooling.

  The compressor control unit 220 controls the frequency of the compressor 11 by using one frequency reduction pattern in the frequency reduction patterns in FIG. 4 at least when the adjustment mode operation of the air conditioner 100 is started. Specifically, the compressor control unit 220 at least at the start of the adjustment mode operation of the air conditioner 100, during the previous operation of the air conditioner 100 (the most recently performed air conditioner before the start of the current air conditioner 100). The frequency of the compressor 11 is controlled using one frequency reduction pattern (predetermined frequency reduction pattern) determined during operation of the machine 100. In other words, the compressor control unit 220 determines the frequency reduction pattern used at the start of the adjustment mode operation of the next air conditioner 100 during the current operation of the air conditioner 100. Specifically, the compressor control unit 220 uses the same frequency as that at the start of the latest adjustment mode operation at the start of the next adjustment mode operation based on the information regarding the change in the room temperature during the operation of the current air conditioner 100. It is determined whether to use a reduction pattern or a frequency reduction pattern different from that at the start of the latest adjustment mode operation. When the compressor control unit 220 determines a frequency reduction pattern to be used at the start of the adjustment mode operation of the next air conditioner 100, the determined frequency reduction pattern is stored in the next pattern storage area 210b.

  When the air conditioner 100 is operated for the first time after installation, the air conditioner 100 has not been operated before that. Therefore, the compressor control unit 220 uses the frequency reduction pattern (for example, the second pattern in FIG. 4) that is initially set at the start of the first adjustment mode operation of the air conditioner 100 for the frequency of the compressor 11. Control.

  The control of the frequency of the compressor 11 by the compressor control unit 220 during the adjustment mode operation of the air conditioner 100 and the determination process of the frequency reduction pattern used at the start of the adjustment mode operation will be further described later.

  When the room temperature measured by the room temperature sensor 32 reaches the target temperature (if the room temperature is lowered to the target temperature during cooling, the room temperature is raised to the target temperature during heating), the air conditioner 100 operates in the adjustment mode. End operation and start normal mode operation.

  The compressor control unit 220 controls the frequency of the compressor 11 using a predetermined frequency adjustment pattern during the normal mode operation of the air conditioner 100. Specifically, during cooling, the compressor controller 220 reduces the frequency of the compressor 11 by B (unit: rpm) every time the room temperature measured by the room temperature sensor 32 falls from the target temperature to the unit temperature. The frequency of the compressor 11 is increased by B each time the room temperature rises from the target temperature to the unit temperature. During heating, the compressor control unit 220 reduces the frequency of the compressor 11 by B each time the room temperature measured by the room temperature sensor 32 rises from the target temperature to the unit temperature, and the room temperature falls from the target temperature to the unit temperature. Every time the frequency of the compressor 11 is increased by B. Here, the amount of change in frequency when the room temperature changes from the target temperature to the unit temperature is the same value (B) during cooling and during heating, but is not limited to this. The amount of change in frequency when the room temperature changes from the target temperature to the unit temperature may be a different value between cooling and heating.

(3) Control of compressor frequency during cooling or heating and determination processing of frequency reduction pattern used at start of adjustment mode operation of air conditioner Frequency of compressor 11 by compressor control unit 220 during cooling or heating An example of a frequency reduction pattern determination process used by the compressor control unit 220 at the start of the control and the adjustment mode operation of the air conditioner 100 will be described using a flowchart.

  Here, the control of the frequency of the compressor 11 by the compressor control unit 220 during cooling and the determination process of the frequency reduction pattern used by the compressor control unit 220 at the start of the adjustment mode operation of the air conditioner 100 are shown in FIGS. This will be described with reference to the flowchart of 5B. Since it is the same as that at the time of air_conditioning | cooling at the time of heating, description is abbreviate | omitted.

  Here, the room temperature of the air-conditioning target space at the time of activation of the air conditioner 100 is in a state where air conditioning is insufficient with respect to the target temperature of the room temperature (that is, a state higher than the target temperature) and the target temperature. And to some extent (above α ° C.). In addition, for the sake of simplification of explanation, it is assumed that after the operation of the air conditioner 100 is started, the operation is not switched from cooling to heating, or the target temperature is not changed midway.

  The compressor controller 220 starts the operation of the compressor 11 when a start command (cooling start command) of the air conditioner 100 is input to the remote controller (step S1). Specifically, the compressor control unit 220 increases the frequency of the compressor 11 in a stepwise manner to a predetermined frequency (for example, up to the maximum operating frequency).

  Next, in step S2, whether or not a value obtained by subtracting the target temperature stored in the target temperature storage area 210a from the room temperature measured by the room temperature sensor 32 is smaller than a predetermined temperature (the aforementioned α ° C.). Is determined. If it is determined that the value obtained by subtracting the target temperature from room temperature is smaller than α ° C., the process proceeds to step S3. Step S2 is repeated until it is determined that the value obtained by subtracting the target temperature from room temperature is smaller than α ° C.

  In step S3, the adjustment mode operation of the air conditioner 100 is started. When the adjustment mode operation of the air conditioner 100 is started, the compressor control unit 220 reduces the frequency as the room temperature measured by the indoor temperature sensor 32 approaches the target temperature from a state where the air conditioning is insufficient. Thus, the frequency of the compressor 11 is controlled. At the start of the adjustment mode operation of the air conditioner 100, the compressor control unit 220 controls the frequency of the compressor 11 using a predetermined frequency reduction pattern determined during the previous operation of the air conditioner 100. Specifically, the compressor control unit 220 controls the frequency of the compressor 11 using the frequency reduction pattern stored in the next pattern storage area 210b. For convenience of explanation, the determination process of the frequency reduction pattern used at the start of the adjustment mode operation of the air conditioner 100 will be described later.

  For example, here, it is assumed that the third pattern in FIG. 4 is stored in the next pattern storage area 210b. When step S3 is executed, the compressor control unit 220 uses the frequency reduction pattern of the third pattern, and whenever the room temperature measured by the room temperature sensor 32 approaches the target temperature, the compressor control unit 220 increases the amount of the compressor 11 by A3. Reduce the frequency.

  Next, in step S4, it is determined whether or not the room temperature measured by the room temperature sensor 32 has reached the target temperature. If the room temperature has reached the target temperature, the process proceeds to step S10. If the room temperature has not reached the target temperature (if it is still higher than the target temperature), the process proceeds to step S5.

  In step S5, it is determined whether or not a predetermined first time (for example, 10 minutes) has elapsed since the adjustment mode operation of the air conditioner 100 was started in step S3. If it is determined that the first time has elapsed, the process proceeds to step S6 and step S7. If it is determined that the first time has not elapsed, the process returns to step S4. The determinations in step S4 and step S5 are preferably performed at intervals that are sufficiently shorter than the first time (for example, every 10 seconds).

  Here, if the room temperature does not reach the target temperature even after the first time has elapsed, it is determined that the capacity of the air conditioner 100 is insufficient.

  Therefore, in step S6, the compressor control unit 220 determines the frequency reduction pattern to be used for the adjustment mode operation of the air conditioner 100 currently being executed as a predetermined reduction suppression pattern among the five frequency reduction patterns in FIG. (For example, the second pattern in FIG. 4). In addition, it is preferable that the frequency reduction pattern in which the frequency of the compressor 11 reduced every time the room temperature approaches the target temperature is relatively small is selected as the reduction suppression pattern. In other words, it is preferable to select a frequency reduction pattern in which the frequency of the compressor 11 is maintained relatively high even when the room temperature approaches the target temperature. After step S6, the compressor control unit 220 uses the reduction suppression pattern to compress the compressor 11 by a predetermined value each time the room temperature approaches the target temperature (for example, only A2 if the reduction suppression pattern is the second pattern). Reduce the frequency.

  In step S6, the compressor control unit 220 determines that the frequency reduction pattern to be used is the frequency reduction pattern in which the frequency of the compressor 11 that is reduced each time the room temperature approaches the target temperature is the smallest (in this embodiment, the first frequency reduction pattern). 1 pattern) may be changed. Further, for example, in step S6, the compressor control unit 220 determines that the frequency reduction pattern to be used is a frequency reduction pattern in which the frequency of the compressor 11 that is reduced each time the room temperature approaches the target temperature is one step lower than the current one. (For example, if the currently used frequency reduction pattern is the third pattern, the second pattern may be changed.)

  In another aspect, the compressor controller 220 may change the frequency reduction pattern to be used and increase the frequency of the compressor 11 in step S6. For example, when the deviation between the room temperature and the target temperature is relatively large (greater than a predetermined threshold) at the time of step S6, the compressor control unit 220 sets the frequency of the compressor 11 to the compressor at the time of step S3. You may increase it so that it may approach 11 frequencies.

  After step S6 ends, the process proceeds to step S8.

  In step S8, it is determined whether or not the room temperature measured by the room temperature sensor 32 has reached the target temperature. If it is determined that the room temperature has reached the target temperature, the process proceeds to step S9. Step S8 is repeated until it is determined that the room temperature has reached the target temperature.

  In step S9, the air conditioner 100 ends the adjustment mode operation and starts the normal mode operation. The compressor control unit 220 reduces the frequency of the compressor 11 by B each time the room temperature measured by the room temperature sensor 32 falls from the target temperature by the unit temperature during the normal mode operation of the air conditioner 100, and the room temperature is the target. Control that increases the frequency of the compressor 11 by B every time the temperature rises from the temperature is executed until the operation of the air conditioner 100 is stopped.

  The process of step S7 is performed in parallel with the processes of step S6, step S8, and step S9. Note that the process of step S7 and the processes of step S6, step S8, and step S9 do not have to be performed at the same time. For example, step S7 may be performed after step S6 is performed.

  In step S <b> 7, the compressor control unit 220 uses the frequency from the start of the adjustment mode operation of the air conditioner 100 to the time when the room temperature reaches the target temperature at the start of the next adjustment mode operation of the air conditioner 100. Determine a reduction pattern. Specifically, the compressor control unit 220 starts the next adjustment mode operation of the air conditioner 100 based on the time from the start of the adjustment mode operation of the air conditioner 100 until the room temperature reaches the target temperature. Use the same frequency reduction pattern as when the adjustment mode operation of the latest air conditioner 100 is started, or suppress the frequency reduction of the compressor 11 more than the frequency reduction pattern used when the adjustment mode operation of the latest air conditioner 100 starts. It is determined whether to use the reduced frequency pattern. That is, the compressor control unit 220 performs the current air conditioning at the start of the adjustment mode operation of the next air conditioner 100 based on the time from the start of the adjustment mode operation of the air conditioner 100 until the room temperature reaches the target temperature. The frequency reduction that uses the same frequency reduction pattern as that at the start of the adjustment mode operation of the compressor 100 or that suppresses the reduction in the frequency of the compressor 11 than the frequency reduction pattern that was used at the start of the adjustment mode operation of the current air conditioner 100 Decide whether to use a pattern. Specifically, the compressor controller 220 determines that the time from the start of the adjustment mode operation of the air conditioner 100 until the room temperature reaches the target temperature is longer than the first time (that is, the capacity of the air conditioner 100). (Based on the determination that the air conditioner is insufficient), at the start of the next adjustment mode operation of the air conditioner 100, the compressor 11 has a lower frequency than the frequency reduction pattern used at the start of the adjustment mode operation of the most recent air conditioner 100. It is determined to use a frequency reduction pattern that suppresses frequency reduction.

  As a specific example, when the frequency reduction pattern used at the start of the adjustment mode operation of the most recent air conditioner 100 is the third pattern, the compressor control unit 220 may, for example, adjust the next adjustment mode of the air conditioner 100. At the start of operation, it is determined to use a frequency reduction pattern in which the reduction of the frequency of the compressor 11 is suppressed rather than the third pattern. Preferably, the compressor control unit 220 uses a frequency reduction pattern of the second pattern in which the reduction of the frequency of the compressor 11 is suppressed by one step rather than the third pattern at the start of the adjustment mode operation of the air conditioner 100 next time. Decide that. The frequency reduction pattern used at the start of the next adjustment mode operation of the air conditioner 100 determined by the compressor controller 220 is stored in the next pattern storage area 210b.

  Next, the case where a process progresses from step S4 to step S10 is demonstrated (refer FIG. 5B).

  In step S10, the air conditioner 100 ends the adjustment mode operation and starts the normal mode operation. The compressor control unit 220 reduces the frequency of the compressor 11 by B each time the room temperature measured by the room temperature sensor 32 falls from the target temperature by the unit temperature during the normal mode operation of the air conditioner 100, and the room temperature is the target. Control that increases the frequency of the compressor 11 by B every time the temperature rises from the temperature is executed until the operation of the air conditioner 100 is stopped. After execution of step S10, the process proceeds to step S11.

  In step S11, it is determined whether or not a predetermined second time (for example, 10 minutes) has elapsed since the room temperature has reached the target temperature (after it has been determined in step S4 that the room temperature has reached the target temperature). The If it is determined that the second time has elapsed since the room temperature reached the target temperature, the process proceeds to step S12. Step S11 is repeated until it is determined that the second time has elapsed since the room temperature reached the target temperature.

  In step S12 and the subsequent steps S13 and S14, the compressor control unit 220 performs the most recent predetermined operation at the start of the next predetermined operation based on the information on the change in the room temperature after the room temperature has reached the target temperature. It is determined whether the same frequency reduction pattern as that at the start of the operation is used or a frequency reduction pattern that promotes a reduction in the frequency of the compressor 11 as compared with the frequency reduction pattern used at the start of the most recent predetermined operation. That is, the compressor control unit 220 uses the same frequency reduction pattern at the start of the next predetermined operation at the start of the next predetermined operation based on the information on the change in the room temperature after the room temperature reaches the target temperature. It is determined whether to use the frequency reduction pattern that promotes the reduction of the frequency of the compressor 11 compared to the frequency reduction pattern used at the start of the predetermined operation this time. Note that the information on the change in room temperature here is not limited to the information on the change in room temperature itself. The information regarding the change in the room temperature here is information on the change in the frequency of the compressor 11 that changes due to the change in the room temperature.

  Specifically, in step S12, whether or not the change in the frequency of the compressor 11 during the second time after the room temperature reaches the target temperature is relatively large (for example, the frequency of the compressor 11 during the second time period). Whether or not the difference between the maximum value and the minimum value is greater than a predetermined threshold value C). When it is determined in step S12 that the change in the frequency of the compressor 11 is relatively large (for example, the difference between the maximum value and the minimum value of the frequency of the compressor 11 in the second time period is greater than a predetermined threshold C) ) Proceeds to step S13. On the other hand, when it is determined in step S12 that the change in the frequency of the compressor 11 is relatively small (for example, the difference between the maximum value and the minimum value of the frequency of the compressor 11 during the second time period is greater than the predetermined threshold C). If smaller, the process proceeds to step S14.

  A relatively large change in the frequency of the compressor 11 in the second time after the room temperature has reached the target temperature means that the room temperature has fluctuated without stabilizing at the target temperature. And it is thought that the fluctuation | variation of room temperature is because the frequency of the compressor 11 is not fully suppressed at the time of adjustment mode driving | operation of the air conditioner 100. FIG.

  Therefore, in step S13, the compressor control unit 220 is used at the start of the next predetermined operation at the start of the next predetermined operation based on information on the change in the room temperature after the room temperature reaches the target temperature. It is decided to use the frequency reduction pattern that promotes the reduction of the frequency of the compressor 11 rather than the frequency reduction pattern. Specifically, when the change in the frequency of the compressor 11 in the second time after the room temperature reaches the target temperature is relatively large, the compressor control unit 220 detects the latest operation at the start of the next predetermined operation. It is determined to use a frequency reduction pattern that promotes a reduction in the frequency of the compressor 11 rather than the frequency reduction pattern used at the start of a predetermined operation. Preferably, the compressor control unit 220 promotes the reduction in the frequency of the compressor 11 by one step at the start of the adjustment mode operation of the air conditioner 100 next time, rather than the frequency reduction pattern used at the start of the most recent predetermined operation. To use the reduced frequency pattern.

  As a specific example, when the frequency reduction pattern used at the start of the adjustment mode operation of the latest air conditioner 100 is the third pattern, the compressor control unit 220 starts the adjustment mode operation of the next air conditioner 100. Sometimes, it is decided to use the frequency reduction pattern of the fourth pattern, for example, which promotes the frequency reduction of the compressor 11 more than the third pattern. The frequency reduction pattern used at the start of the next adjustment mode operation of the air conditioner 100 determined by the compressor controller 220 is stored in the next pattern storage area 210b.

  On the other hand, in step S14, the compressor control unit 220, based on the information on the change in the room temperature after the room temperature reaches the target temperature, specifically, the compressor for the second time after the room temperature reaches the target temperature. When the change in the frequency of 11 is relatively small, it is determined to use the same frequency reduction pattern as that at the start of the most recent predetermined operation at the start of the next predetermined operation.

  In step S14, the compressor control unit 220 starts the adjustment mode operation of the air conditioner 100 next time based on the time from the start of the adjustment mode operation of the air conditioner 100 until the room temperature reaches the target temperature. It also serves to determine the frequency reduction pattern to be used. Based on the time from the start of the adjustment mode operation of the air conditioner 100 to the time when the room temperature reaches the target temperature, the compressor control unit 220 starts the next adjustment mode operation of the air conditioner 100, and then sets the latest air conditioner 100. The same frequency reduction pattern as that at the start of the adjustment mode operation is used, or a frequency reduction pattern in which the frequency reduction pattern of the compressor 11 is suppressed more than the frequency reduction pattern used at the start of the adjustment mode operation of the most recent air conditioner 100. Decide whether to use. Specifically, in step S14, the compressor controller 220 determines that the time from the start of the adjustment mode operation of the air conditioner 100 until the room temperature reaches the target temperature is shorter than the first time. At the start of the adjustment mode operation of the air conditioner 100, it is determined to use the same frequency reduction pattern as the frequency reduction pattern used at the start of the adjustment mode operation of the latest air conditioner 100.

  As a specific example, when the frequency reduction pattern used at the start of the adjustment mode operation of the most recent air conditioner 100 is the third pattern, the compressor control unit 220 performs the next adjustment of the air conditioner 100 in step S14. At the start of mode operation, it is decided to use the frequency reduction pattern of the third pattern. The frequency reduction pattern used at the start of the next adjustment mode operation of the air conditioner 100 determined by the compressor controller 220 is stored in the next pattern storage area 210b.

(4) Features (4-1)
The air conditioner 100 according to the present embodiment includes the refrigerant circuit 10, an indoor temperature sensor 32 as an example of a measurement unit, a storage unit 210, and a compressor control unit 220 as an example of a frequency control unit. The refrigerant circuit 10 includes an inverter-driven compressor 11. The indoor temperature sensor 32 measures the room temperature of the air conditioning target space. The storage unit 210 stores a target temperature of room temperature. The compressor control unit 220 controls the frequency of the compressor 11 so that the room temperature measured by the room temperature sensor 32 decreases as the temperature approaches the target temperature from a state where air conditioning is insufficient. The compressor control unit 220 has a plurality of frequency reduction patterns. The compressor control unit 220 controls the frequency of the compressor 11 at the start of a predetermined operation (adjustment mode operation) using a predetermined frequency reduction pattern determined during the previous operation. The compressor control unit 220 uses the same frequency reduction pattern as that at the start of the most recent predetermined operation at the start of the next predetermined operation, or at the start of the most recent predetermined operation based on the information related to the change in room temperature. Determines whether to use a different frequency reduction pattern.

  In the present air conditioner 100, a plurality of frequency reduction patterns of the compressor 11 used when the room temperature approaches the target temperature from a state where air conditioning is insufficient is prepared. Based on the information on the change in room temperature during operation, whether to use the frequency reduction pattern used at the start of the most recent predetermined operation or another frequency reduction pattern at the start of the next predetermined operation It is determined. That is, the air conditioner 100 learns the frequency control of the compressor 11 suitable for air conditioning the air-conditioning target space based on the actual operation, and performs the frequency control of the compressor 11 reflecting the learning result. . Therefore, in this air conditioner 100, the room temperature can be adjusted to the target temperature quickly and accurately at the start of operation.

  In particular, in recent years, highly airtight and highly heat-insulated houses, which are superior in airtightness and heat insulation as compared with general houses, are becoming popular. Even if the conditions of room size and room temperature at the start of air conditioning are the same in general housing and highly airtight and highly insulated housing, if the air conditioner is operated with the same control content, the mode of change in room temperature Are unlikely to be the same. For this reason, it is difficult to initially set the compressor control process (compressor frequency reduction process when the room temperature approaches the target temperature) that is optimal for all houses in advance. However, here, in order to learn the frequency control of the compressor 11 suitable for the air conditioner 100 to air-condition the air-conditioning target space based on the actual operation, the room temperature of the air-conditioning target space is quickly and accurately targeted. Can be adjusted to temperature.

(4-2)
In the air conditioner 100 of the present embodiment, the compressor control unit 220 determines the most recent predetermined operation at the start of the next predetermined operation based on the time from the start of the predetermined operation until the room temperature reaches the target temperature. It is determined whether to use the same frequency reduction pattern as that at the start of operation, or to use a frequency reduction pattern in which the frequency reduction of the compressor 11 is suppressed more than the frequency reduction pattern used at the start of the most recent predetermined operation.

  The air conditioner 100 determines whether the capacity of the air conditioner 100 is insufficient based on the time from the start of a predetermined operation until the room temperature reaches the target temperature, and suppresses the reduction in the frequency of the compressor 11 according to the determination result. The frequency reduction pattern thus used is used at the start of the next predetermined operation. Therefore, in the air conditioner 100, the room temperature can be quickly adjusted to the target temperature at the start of operation or the like based on the environment of the air conditioning target space.

(4-3)
In the air conditioner 100 of the present embodiment, the compressor control unit 220 starts the most recent predetermined operation at the start of the next predetermined operation based on the information on the change in the room temperature after the room temperature reaches the target temperature. It is determined whether to use the same frequency reduction pattern as that at the time, or to use a frequency reduction pattern that promotes a reduction in the frequency of the compressor 11 than the frequency reduction pattern used at the start of the most recent predetermined operation.

  Note that the information regarding the change in the room temperature here may not be the information on the change in the room temperature itself, but in the present embodiment, the information on the change in the frequency of the compressor 11 due to the change in the room temperature.

  The air conditioner 100 determines the excess capacity of the air conditioner 100 based on the information on the change in the room temperature after reaching the target temperature, and sets the frequency reduction pattern that promotes the frequency reduction of the compressor 11 according to the determination result for the next time. Used at the start of predetermined operation. Therefore, in the present air conditioner 100, the room temperature can be accurately adjusted to the target temperature without causing thermo-off or hunting at the start of operation or the like based on the environment of the air-conditioning target space.

(4-4)
In the air conditioner 100 of the above embodiment, in the plurality of frequency reduction patterns, the magnitude of the frequency of the compressor 11 that is reduced each time the room temperature approaches the target temperature is different.

  Since this air conditioner 100 has a plurality of frequency reduction patterns having different modes of frequency reduction, the room temperature of the air-conditioning target space can be accurately controlled.

(5) Modification A modification of the above embodiment is shown below. The modified examples may be appropriately combined as long as they do not contradict each other.

(5-1) Modification A
In the above embodiment, the frequency of the compressor 11 is reduced by a certain amount every time the room temperature approaches the target temperature in each frequency reduction pattern, but the present invention is not limited to this.

  For example, each frequency reduction pattern may be determined so that the frequency of the compressor 11 that changes each time the room temperature approaches the target temperature becomes smaller as the room temperature approaches the target temperature. And the compressor control part 220 may have multiple frequency reduction patterns from which the degree of reduction of the frequency of the compressor 11 when room temperature approaches target temperature differs.

(5-2) Modification B
In the above embodiment, the adjustment mode operation of the air conditioner 100 is started after the value obtained by subtracting the target temperature from the room temperature becomes lower than the predetermined temperature. However, the adjustment mode operation is executed immediately after the air conditioner 100 is started. Also good. Then, the compressor control unit 220 increases the frequency of the compressor 11 using the frequency reduction pattern as the room temperature approaches the target temperature immediately after increasing the frequency of the compressor 11 to a predetermined frequency step by step. You may control to reduce.

(5-3) Modification C
In the above embodiment, if the room temperature does not reach the target temperature even after the first time has elapsed, the frequency reduction pattern used in the adjustment mode operation of the air conditioner 100 is changed to the reduction suppression pattern as in step S6 of FIG. 5A. However, the present invention is not limited to this, and step S6 may be omitted. However, from the viewpoint of user comfort of the air conditioner 100, step S6 is preferably executed.

(5-4) Modification D
In the above embodiment, it is determined whether or not the change in the frequency of the compressor 11 after the room temperature reaches the target temperature in step S12 is large, but the present invention is not limited to this. For example, it may be determined whether the change in the room temperature is large (whether the difference between the maximum room temperature and the maximum room temperature during the second time period after the room temperature reaches the target temperature is greater than a predetermined threshold). .

(5-5) Modification E
In the above embodiment, it is determined whether or not the width of the change in the frequency of the compressor 11 after the room temperature reaches the target temperature in step S12 is large, but the present invention is not limited to this. For example, in step S12, it is determined whether or not the number of changes in the frequency of the compressor 11 after the room temperature has reached the target temperature (the number of times the frequency has been increased or decreased) is greater than a predetermined threshold. The process may be configured to proceed to step S13 when the number is greater than the predetermined threshold, and to step S14 when the number of changes is smaller than the predetermined threshold.

(5-6) Modification F
In the above-described embodiment, the compressor control unit 220 determines a frequency reduction pattern to be used at the start of the next adjustment mode operation of the air conditioner 100 based on information related to a change in room temperature. However, in addition to this, the compressor control unit 220 may determine a frequency reduction pattern to be used at the start of the next adjustment mode operation of the air conditioner 100 based on the following information, for example.

  For example, during the adjustment mode operation of the air conditioner 100, the compressor control unit 220 instructs the remote controller to change the target temperature so as to increase the air conditioning (a command to lower the target temperature during cooling, or a target temperature during heating. May be configured to determine that the air conditioner 100 has insufficient capacity. Then, based on the determination result, the compressor control unit 220 generates a frequency reduction pattern that suppresses the reduction in the frequency of the compressor 11 from the frequency reduction pattern used at the start of the latest adjustment mode operation. It may be configured to be used at the start of operation.

  The present invention is widely applicable to air conditioners and useful.

DESCRIPTION OF SYMBOLS 10 Refrigerant circuit 11 Compressor 32 Indoor temperature sensor (measurement part)
100 Air Conditioner 210 Storage Unit 220 Compressor Control Unit (Frequency Control Unit)

JP 2014-190600 A

Claims (4)

A refrigerant circuit (10) including an inverter-driven compressor (11);
A measurement unit (32) for measuring the room temperature of the air-conditioning target space;
A storage unit (210) for storing the target temperature of the room temperature;
A frequency control unit (220) for controlling the frequency of the compressor so that the room temperature measured by the measurement unit decreases as the frequency approaches the target temperature from a state where air conditioning is insufficient;
An air conditioner equipped with
The frequency control unit
Having multiple frequency reduction patterns,
At the start of the predetermined operation, the frequency of the compressor is controlled using a predetermined frequency reduction pattern determined at the previous operation,
Based on the information related to the change in room temperature, at the start of the next predetermined operation, use the same frequency reduction pattern as the most recent start of the predetermined operation, or different from the most recent start of the predetermined operation. Determine whether to use a frequency reduction pattern,
Air conditioner (100). The frequency control unit, based on the time from the start of the predetermined operation until the room temperature reaches the target temperature, at the start of the next predetermined operation, Determine whether to use the same frequency reduction pattern or a frequency reduction pattern that suppresses the reduction in the frequency of the compressor than the frequency reduction pattern used at the start of the predetermined operation most recently.
The air conditioner according to claim 1. The frequency control unit is configured to reduce the same frequency as when the predetermined operation is started the next time based on information on a change in the room temperature after the room temperature reaches the target temperature. Determining whether to use a pattern, or to use a frequency reduction pattern that facilitates a reduction in the frequency of the compressor over the frequency reduction pattern used at the start of the most recent predetermined operation,
The air conditioner according to claim 1 or 2. In the plurality of frequency reduction patterns, the magnitude of the frequency of the compressor that is reduced each time the room temperature approaches the target temperature is different.
The air conditioner according to any one of claims 1 to 3.

Images