JPH05157326A - Operation controller of air conditioner - Google Patents

Abstract

PURPOSE:To prevent a hunting in an air conditioner by a method wherein a capacity control of a compressor and an elimination of load state control are carried out in response to a requested capability. CONSTITUTION:An operation control device is provided with a compressor 1 of which frequency can be variably adjusted by an inverter. An increasing or decreasing variation range of an inverter frequency is calculated by a varying amount calculation means 15. In the case that a condensing temperature of refrigerant exceeds a predetermined value lower than a value for deciding an over-load state, the increasing or decreasing varying amount of the inverter frequency calculated by a varying amount calculation means 15 in response to a temperature difference between the predetermined value and the present condensing temperature by the over-load correction means 16 is corrected to its negative side. With such an arrangement, occurrence of hunting caused by individual controlling, wherein a reduced amount of capacity for eliminating the over-load with a capacity varying amount caused by a capacity control corresponding to the requested capability, can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner operation control device, and more particularly to a hunting prevention measure by capacity control according to required capacity and capacity control for overload condition elimination.

[0002]

2. Description of the Related Art Conventionally, as an operation control device for an air conditioner equipped with a compressor whose operating frequency is variably adjusted by an inverter, an inverter for an air conditioner is selected according to a temperature difference between room temperature and a set value of room temperature, that is, a required capacity. The capacity control for increasing / decreasing the output frequency is known as the capacity control of a general air conditioner.

Further, an excessive rise in the condensing temperature of the refrigerant is detected by a heat exchange temperature or a pressure switch, and when the condensing temperature excessively rises, the frequency of the inverter is reduced by a constant value so as to eliminate the overload condition. So-called overload control is also known as general control, and it is also common to perform capacity control for eliminating overload separately from the above capacity control.

[0004]

However, when the capacity control based on the required capacity is performed while the capacity reduction control for overload elimination is performed separately from the capacity control based on the required capacity, the following problems occur. was there.

That is, as shown in FIG. 8, for example, when a so-called drooping region is provided to uniformly reduce the inverter frequency by one step when the condensation temperature exceeds 59 ° C., the inverter frequency is increased by one step due to an increase in required capacity. If this is done, the condensing temperature will rise accordingly (U in the figure
1)), under conditions near a predetermined value (59 ° C) for capacity reduction by overload control (overload condition), the condensation temperature immediately exceeds 59 ° C and plunges into the drooping region, causing inverter frequency Is reduced by one step (D1 portion in the figure). When the capacity is insufficient due to this capacity reduction, the inverter frequency is controlled again from the required capacity side so as to increase by one step (U2 portion in the figure), and the condensation temperature immediately exceeds 59 ° C and plunges into the drooping region. (D2 part in the figure). When one kind of hunting state in which such increase and decrease of the inverter frequency is repeated occurs, there is a possibility that the frequent change of the inverter frequency causes discomfort and the refrigerant state becomes unstable.

The present invention has been made in view of the above points, and an object thereof is to perform hunting by performing capacity control that integrates capacity control by required capacity and capacity reduction by eliminating an overload condition. To prevent.

[0007]

In order to achieve the above object, the means of the invention as defined in claim 1 is, as shown in FIG. 1, a compressor (1) whose operating frequency is variably adjusted by an inverter. It is premised on the equipped air conditioner.

Then, as an operation control device of the air conditioner, a room temperature detecting means (Thr) for detecting the room temperature and an output of the room temperature detecting means (Thr) are received to respond to the temperature difference between the room temperature and the set temperature. Change amount calculation means (15) for calculating the increase / decrease change amount of the frequency of the inverter, condensation temperature detection means (Thc) for detecting the condensation temperature of the refrigerant, and outputs of the condensation temperature detection means (Thc), When the condensing temperature is equal to or higher than a predetermined value lower than the judgment value of the overload state, the frequency of the inverter calculated by the change amount calculating means (15) is calculated according to the temperature difference between the predetermined value and the current condensation temperature. Overload correction means (16) for correcting the increase / decrease change amount to the negative side, and frequency control means for increasing / decreasing the output frequency of the inverter according to the increase / decrease change amount corrected by the overload correction means (16) ( 10) and In which was formed.

According to a second aspect of the present invention, in the first aspect of the present invention, the inverter frequency is divided into a plurality of steps. Further, the change amount calculation means (1
5) and the overload correction means (16) are configured so that the change amount of the inverter frequency is converted into an integer into step values "1", "0", "-1" for calculation.

[0010]

With the above construction, in the first aspect of the invention, the change amount calculating means (15) uses the temperature difference between the room temperature and the set temperature detected by the room temperature detecting means (Thr) as an index of the required capacity of the inverter. Although the amount of change in frequency is calculated, the condensing temperature may rise excessively and the refrigerant state may deteriorate as it is. According to the first aspect of the present invention, when the condensing temperature is equal to or higher than the predetermined value lower than the judgment value of the overload state, the overload correction means (16) determines the temperature difference between the predetermined value and the present condensing temperature. Accordingly, the capacity change amount calculated by the change amount calculation means (15) is corrected to the negative side, so that the capacity change amount by the frequency control according to the required capacity is reduced by the capacity reduction amount for eliminating the overload condition. The frequency control means 10 increases or decreases the inverter frequency according to the corrected amount of change in the capacity, so that the overload state can be eliminated without causing hunting as in the case of performing both controls individually. Will be.

According to a second aspect of the present invention, in the first aspect of the invention, the change amount calculation means (15) and the overload correction means (16) change the change amount of the inverter frequency by 1,0-.
Since the integer is set to 1, the change in the refrigerant state is smoothed, and the destabilization of control due to the occurrence of fine chattering is prevented.

[0012]

Embodiments of the present invention will be described below with reference to the drawings starting from FIG.

FIG. 2 shows a refrigerant piping system of an air conditioner to which the present invention is applied, which is a so-called separate type in which one indoor unit (A) is connected to one indoor heat exchanger (B). It is a thing. The outdoor unit (A) is switched to a compressor (1) whose operating frequency is variably adjusted by an inverter (not shown), and a solid line in the drawing during the cooling operation and a broken line in the drawing during the heating operation. A four-way switching valve (2), an outdoor heat exchanger (3) that functions as a condenser during cooling operation, and as an evaporator during heating operation,
A decompression unit (20) for decompressing the refrigerant, and a compressor (1)
The main unit includes an accumulator (7) for removing the liquid refrigerant in the suction refrigerant, which is installed in the suction pipe of the unit, and the indoor unit (B) serves as an evaporator during cooling operation. An indoor heat exchanger (6) that functions as a condenser during heating operation is arranged. The above-mentioned devices are sequentially connected by a refrigerant pipe (8), and a refrigerant circuit (9) is configured so that heat is transferred by circulating the refrigerant.

The pressure reducing section (20) is provided with a receiver (4) for storing the liquid refrigerant and an electric expansion valve (5) having a pressure reducing function and a flow rate adjusting function for the liquid refrigerant. The receiver (4) and the electric expansion valve (5) are disposed so that the electric expansion valve (5) communicates with the lower portion of the receiver (4), that is, the liquid portion. ) Auxiliary heat exchanger (3a)
Are arranged in series on the common path (8a). Then, between the outdoor end (P) of the receiver (4) upstream of the common path (8a) and the outdoor heat exchanger (3), the outdoor heat exchanger (3) goes to the receiver (4). Between the point (P) of the common path (8a) and the indoor heat exchanger (6) by the first inflow path (8b1) via the first check valve (D1) that allows only the circulation of the refrigerant of Is from the indoor heat exchanger (6) to the receiver (4)
The electric expansion valve (5) and the like on the common path (8a), while being connected to each other by the second inflow path (8b2) through the second check valve (D2) that allows only the flow of the refrigerant to the Between the end portion (Q) on the end side and the point (R) between the second check valve (D2) and the indoor heat exchanger (6), the electric expansion valve (5) is connected to the indoor heat exchanger (6). The first check valve (D1) and the point (Q) of the common path (8a) by the first outflow passage (8c1) through the third check valve (D3) that allows only the flow of the refrigerant to the first check valve (D1). A fourth check valve (D4) which allows only the flow of the refrigerant from the electric expansion valve (5) to the outdoor heat exchanger (3) between the outdoor heat exchanger (3) and the point (S). Through the 2nd outflow path (8c2)
Are connected to each other.

Further, a capillary tube (C) is interposed between a point (P) on the upstream side and a point (Q) on the outflow side of the receiver (4) to prevent liquid sealing. Bypass road (8f)
Is provided, the liquid sealing prevention bypass passage (8f) prevents liquid sealing when the compressor (1) is stopped, and the gas refrigerant flows from the upper portion of the receiver (4) to the first outflow passage (8c1). ) Is able to move to the side. The degree of pressure reduction of the capillary tube (C) is set to be sufficiently larger than that of the electric expansion valve (5), so that the electric flow expansion function of the electric expansion valve (5) during normal operation can be improved. It is designed to be maintainable.

Incidentally, (F1) to (F4) are filters for removing dust in the refrigerant, and (ER) is a silencer for reducing the operation noise of the compressor (1).

Further, the air conditioner is provided with sensors, (Th2) is arranged in the discharge pipe, the discharge pipe sensor detects the discharge pipe temperature T2, and (Tha) is the air of the outdoor unit (A). The outdoor suction sensor (Thc), which is arranged at the suction port and detects the intake air temperature Ta that is the outside air temperature, is arranged in the outdoor heat exchanger (3) and becomes the condensation temperature during the cooling operation and the evaporation temperature during the heating operation. An external heat exchange sensor as a condensation temperature detecting means for detecting the heat exchange temperature Tc, (Th
r) is arranged at the air suction port of the indoor unit (B), an indoor suction sensor as room temperature detecting means for detecting the suction air temperature Tr, which is the indoor temperature, and (The) is arranged at the indoor heat exchanger (6). , An internal heat exchange sensor Te for detecting the internal heat exchange temperature Te which becomes the condensation temperature during the cooling operation and becomes the evaporation temperature during the heating operation, and (HPS) is turned on due to the excessive increase in the high-pressure side pressure, and the protection device (11) described later The high-pressure pressure switch (LPS) to be operated is a low-pressure pressure switch that is turned on by the excessive decrease of the low-pressure side pressure to operate the protection device (11). The signals (10) of each sensor are connected to a controller that controls the operation of the air conditioner, and the controller (10) outputs signals of the air conditioner according to the signals of each sensor. It is designed to control driving.

In the controller (10),
Protective device (11) that operates when an abnormality occurs during operation of the air conditioner to abnormally stop the air conditioner
And the setting switch (1
2) and are built in. Then, the protection device (1
Although not shown in 1), the high / low pressure switch (HP
In addition to S) and (LPS), the signal of the discharge pipe sensor (Th2) is also input. When the discharge pipe temperature T2 becomes higher than a predetermined temperature, the protection device (11) operates to abnormally stop the air conditioner. It is designed to prevent accidents such as burnout of the compressor (1).

In the refrigerant circuit (9), during cooling operation, the liquid refrigerant condensed and liquefied in the outdoor heat exchanger (3) flows in from the first inflow passage (8b1), and the first check valve (D1) is turned on. After being stored in the receiver (4) and decompressed by the electric expansion valve (5), it is evaporated in the indoor heat exchanger (6) through the first outflow passage (8c1) and returned to the compressor (1). While becoming a cycle,
During the heating operation, the liquid refrigerant condensed and liquefied in the indoor heat exchanger (6) flows in from the second inflow passage (8b2), is stored in the receiver (4) via the second check valve (D2), After the pressure is reduced by the electric expansion valve (5), it is circulated through the second outflow passage (8c2) to evaporate in the outdoor heat exchanger (3) and return to the compressor (1).

Here, FIG. 3 shows the relationship between the load, that is, the change in the temperature difference ΔT and the step value N of the inverter frequency during the cooling operation. As shown in the figure, the temperature difference ΔT is −
It is divided into a plurality of zones at intervals of 0.5 ° C between 1.0 and 1.5 ° C, of which 0 to 0.5 ° C is the comfort zone. In the figure, N = 1 indicates that the compressor (1) is stopped, and N = 2.
Indicates the minimum capacity, N = 9 indicates the maximum capacity, and the rightmost number in the figure indicates the step value of the frequency when the thermostat is returned.

Start of operation of the air conditioner (time t in the figure)
o) Immediately after the start-up mode (area Mo in the figure), the compressor (1) is operated at the maximum capacity (N = 9) and the continuous operation mode in which the temperature difference ΔT is 1.5 ° C. or less (area in the figure) Upon entering M1), the frequency is adjusted as follows. First, the temperature difference Δ
When T is reduced to 0.5 ° C or lower, N = N-1, and when the temperature difference ΔT is 0 ° C or lower, N = N-2, and the temperature difference ΔT is-.
When it becomes 0.5 ° C. or less, N = N−3 is set to reduce the step value N until then, and when the temperature difference ΔT becomes −1 ° C. or less, N = 1 is uniformly set, that is, the compressor (1). Is stopped (after waiting for a predetermined time). On the other hand, when the temperature difference ΔT increases, when the temperature difference ΔT exceeds 0 ° C., N = N + 1,
When the temperature difference ΔT exceeds 0.5 ° C, N = N + 2, and the temperature difference ΔT
When the temperature exceeds 1.0 ° C., N = N + 3 is changed to increase the step value N until then, and the temperature difference ΔT is 1.5.
When the temperature exceeds ℃, the capacity of the compressor (1) becomes the maximum capacity (N = 9).
To When the temperature difference ΔT is maintained at 0 ° C. or less for a certain period of time (for example, about 3 minutes) (constant of 0.5 ° C. width), the frequency step value N is reduced by one step. , The step value N of the frequency is increased by "1" when it is kept constant for a certain time in the region of 0.5 ° C. or higher.

Next, specific control contents of the controller (10) will be described. FIG. 4 shows the control contents during the cooling operation of the controller (10). In step ST1, the intake air temperature Tr detected by the indoor intake sensor (Thr) and the room temperature set by the setting switch (12) are set. Temperature difference ΔTr with set value Ts (= Ts-Tr)
Based on, the change amount dN9 depending on the required capacity of the step value N of the inverter frequency is calculated by the following formula (1) dN9 = f (ΔTr) = 1.0 (ΔTr−ΔTr-6) +0.25 (ΔTr + 2ΔTr-3 + ΔTr-6 ) +0.05 (ΔTr-2ΔTr-3 + ΔTr-6) (1) Here, Tr-3 is the detection value 15 seconds before, Tr-6 is the detection value 30 seconds before (sampling time is 5 seconds), and the above equation (1) is the so-called PID control calculation in the digital system. It is a formula.

Next, in step ST2, it is judged whether or not a T18 timer (not shown) for accumulating the time after the load zone is changed is 10 min or longer. If it is 10 min or longer, T18 is set in step ST3. After the count T18 of the timer is set to "0", if it is not longer than 10 minutes, it is left as it is, and the process proceeds to step ST4.
It is determined whether the capacity change amount dN9 calculated in 1 is 0.5 or more.

When the determination in step ST4 is NO, that is, when the capacity change amount dN9 is not 0.5 or more, it is further determined in step ST5 whether the capacity change amount dN9 is -0.5 or less, Capacity change amount dN9-
If it is not less than 0.5, it is determined that it is not necessary to change the capacity of the compressor (1), the process proceeds to step ST6, and dN
9 = 0 is decided.

On the other hand, in the determination of the above step ST4, dN
When 9 ≧ 0.5, the calculation for capacity increase is performed by the following procedure. First, in step ST7, it is determined whether or not the frequency step value N is larger than the value (Nt + 3) obtained by adding the constant step value 3 to the rated frequency step value Nt. If N> Nt + 3 is not satisfied, the process proceeds to step ST12 and dN9 = 1 and immediately the capacity change amount d
Although N9 is set to the increase value "1", if N> Nt + 3, the control of step ST12 is performed after the control of the following steps ST8 to ST11. That is, as shown in FIG. 6, since the step value of the frequency approaches the limit after reaching the rated value Nt, the frequency is gradually increased in order to avoid the operation of the protection device (11). (SU in the figure).

First, in step ST8, it is determined whether or not the flag F6 is "1". If F6 = 1, it is determined that the capacity will not be increased even if the capacity is immediately increased.
On the other hand, when F6 = 1 while shifting to the control of 2, it proceeds to step ST9 and determines whether or not the count of the T18 timer is "0". Here, F6 is a flag that becomes "1" while the inverter frequency is increasing. If T18 = 0, the counting of the T18 timer is started in step ST10, and if T18 = 0 is not satisfied, the process proceeds to step ST11, and the count T18 of the T18 timer is set to 40.
Wait until it reaches sec or more, and then step ST12 above.
Proceed to. After determining dN = 9 in step ST12, the T18 timer is reset in step ST13.

On the other hand, in the determination of step ST5, dN
If 9 ≦ −0.5, it is determined that the capacity should be reduced,
The capacity reduction control of step ST14 and thereafter is performed. First, in step ST14, it is determined whether or not the step value N of the frequency is less than or equal to the value 5 obtained by adding the constant step value 3 to the lowest step value 2. If N ≦ 5, the process immediately proceeds to step ST19, While the capacity change amount dN9 is set to the reduction value “−1”, if N ≦ 5, as shown in FIG. 6, it is determined that the state should be gradually reduced, and steps ST15 to ST15 are performed.
In step 18, the same standby control as in steps ST8 to ST11 is performed, and then the process proceeds to step ST19. However, F7
Is a flag that becomes "1" while the inverter frequency is decreasing. Then, after setting dN = -1 in step ST19, the count of the T18 timer is reset in step ST20, and further, in step ST21, it is determined whether or not the flag F8 is "1", and F8 = If it is not 1, if it is F8 = 1, if F8 = 1, the capacity control according to the load is terminated after the control of the step ST6. However, F8 is a flag that becomes "1" during the oil return operation, and even if it is decided to process the inverter frequency,
If the inverter frequency is being increased for oil return, the inverter frequency is not reduced until the oil return control is completed.

Next, FIG. 5 shows the contents of the overload correction control for correcting the capacity change amount dN9 calculated in the above flow in order to eliminate the overload condition. First, step S
At R1, the condensing temperature Tc of the refrigerant detected by the external heat exchange sensor (Thc) is a predetermined value (56-XH1 ° C) slightly lower than the judgment value (59 ° C) of the overload state (where XH1 is indoors). It is determined whether or not a pipe correction value according to the communication pipe length between the outer units (A) and (B) is exceeded, and the overload correction value X8 is calculated as a function of the condensing temperature Tc. That is, the overload correction value X8 is calculated based on the following mathematical expression (2) X8 = 0.83 {56- (Tc-XH1)} (2).

On the other hand, if it is determined in step SR1 that Tc
If it is not> 56-XH1, it is judged that there is no danger of falling into the overload state, and X8 = 0 is set in step SR3, and then the processing proceeds to step SR4, and in step SR4, X8 is set.
It is determined whether or not ≦ −0.5. If X8 ≦ −0.5, it is determined that the capacity change amount dN9 needs to be corrected to the negative side, and in step SR5, X8 = −1 is set. On the other hand, X
Unless 8 ≦ −0.5, it is determined that it is not necessary to change the capacity change amount dN9, and X8 = 0 is set in step SR6.

Then, in step SR7, dN9 = dN
9 + X8, the capacity change amount dN9 in consideration of the correction for overload elimination is calculated, and further, steps SR8 to S8
In R12, if the capacity change amount dN9 is "1" or more, it is "1", and if it is "-1" or less, it is "-1".
In other cases, it is converted into an integer of "0" and the correction control for overload elimination is completed.

In the above control flow, step ST
The change amount calculation means (15) according to the invention of claim 1 is constituted by the control of 1 to ST21, and steps SR1 to SR
The control of 12 constitutes an overload correction means (16).

Although the control in the cooling operation has been described in the above embodiment, the capacity control according to the load and the correction control for overload elimination are performed in the heating operation as well. However, during the heating operation, the control in step SR1 determines whether or not Tc> 54-XH1.

Therefore, in the above embodiment, the change amount calculating means (15) calculates the temperature difference ΔTr between the intake air temperature (room temperature) Tr detected by the indoor intake sensor (Thr) and the set temperature Ts as the required capacity (load). ), The change amount of the step value N of the inverter frequency, that is, the capacity change amount dN9 is calculated.

On the other hand, in an overloaded state such as high outside air cooling, the refrigerant temperature in the refrigerant circuit (9) deteriorates if left unattended, such as the condensation temperature Tc rising excessively.
Although it is necessary to take measures such as reducing the capacity of the control, if the capacity reduction is performed separately from the conventional capacity control according to the load, there is a risk that the control will fall into the hunting state as described above (Fig. 8).

Here, in the above embodiment, the condensing temperature Tc is a predetermined value lower than the judgment value of the overload state (59 ° C. in the above embodiment) (56 ° C. if the pipe length correction term XH1 is ignored in the above embodiment). ) In the above case, overload correction means (16)
As a result, the capacity change amount calculated by the change amount calculation means (15) is corrected to the negative side in accordance with the temperature difference between the predetermined value (56 ° C.) and the current condensing temperature Tc, and as the capacity control means. The controller (10) increases or decreases the inverter frequency N according to the corrected capacity change amount dN9.

That is, as shown in FIG. 7, when a predetermined value of 56 ° C., which is slightly lower than 59 ° C., is expected to fall into an overload state after that, the capacity required to eliminate this overload state is reduced. The overload correction value X8, which is the amount, is incorporated into the capacity change amount dN9, and eventually the capacity change amount dN9 from the required capacity and the capacity reduction necessary for overload elimination are added, so that the condensing temperature Tc is the predetermined value ( 56 ° C). Therefore, for each step of the inverter frequency, hunting can be prevented from occurring for each control block, and the control can be stabilized.

Further, as in the above embodiment, when the inverter frequency change amount dN9 is made into an integer of 1, 0, -1, the change of the refrigerant state can be smoothed and fine chattering occurs. There is an advantage in that the control can be prevented from becoming unstable.

[0038]

As described above, according to the first aspect of the present invention, as the operation control device for the air conditioner having the compressor whose operating frequency is variably adjusted by the inverter, there are provided a room temperature and a preset temperature. The inverter frequency increase / decrease amount is calculated according to the temperature difference, and when the condensing temperature is equal to or higher than a predetermined value that is lower than the judgment value of the overload condition, the increase / decrease is changed according to the temperature difference between the predetermined value and the current condensation temperature. The calculated value of the amount is corrected to the negative side, and the capacity of the compressor is increased or decreased according to the corrected increase / decrease change amount, so hunting is performed to eliminate the overload condition and control the capacity according to the required capacity. Can be performed without inviting, and the control can be stabilized.

According to the invention of claim 2, in the invention of claim 1, the step value of the inverter frequency is divided into a plurality of step values, and the change amount of the inverter frequency is set to an integer step value 1, 0, -1. Since the calculation is performed by changing the values, the change in the refrigerant state can be smoothed, and the occurrence of fine chattering can be prevented.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of the invention.

FIG. 2 is a refrigerant piping system diagram of the air conditioner.

FIG. 3 is a diagram showing a relationship between a change in differential temperature and an inverter frequency during a cooling operation.

FIG. 4 is a flowchart showing the contents of frequency control according to the required capacity.

FIG. 5 is a flow chart showing the contents of correction control of an inverter frequency change amount.

FIG. 6 is an explanatory diagram showing a method of changing an inverter frequency.

FIG. 7 is a diagram showing a changing state of the condensation temperature in the present invention.

FIG. 8 is a diagram showing a change state of a condensing temperature by a conventional control device.

[Explanation of symbols]

 1 Compressor 10 Controller (frequency control means) 15 Change amount calculation means 16 Overload correction means Thr Indoor suction sensor (room temperature detection means) Thc External heat exchange sensor (condensation temperature detection means)

Claims (2)

[Claims] 1. An air conditioner equipped with a compressor (1) whose operating frequency is variably adjusted by an inverter, wherein a room temperature detecting means (Thr) for detecting an indoor temperature and an output of the room temperature detecting means (Thr). In response, the change amount calculation means (15) calculates the increase / decrease change amount of the frequency of the inverter according to the temperature difference between the room temperature and the set temperature, and the condensation temperature detection means (Thc) that detects the condensation temperature of the refrigerant. Receiving the output of the condensing temperature detecting means (Thc) and, when the condensing temperature is equal to or higher than a predetermined value lower than the judgment value of the overload state, the change is made according to the temperature difference between the predetermined value and the current condensing temperature. Quantity calculation means (1
5) Overload correction means (16) for correcting the increase / decrease change amount of the inverter frequency calculated in 5) to the negative side, and the inverter increase / decrease amount according to the increase / decrease change amount corrected by the overload correction means (16). An operation control device for an air conditioner, comprising: a frequency control means (10) for increasing / decreasing an output frequency. 2. The operation control device for an air conditioner according to claim 1, wherein the inverter frequency is divided into a plurality of steps,
The change amount calculation means (15) and the overload correction means (1)
6) is an operation control device for an air conditioner, characterized in that the change amount of the inverter frequency is calculated by converting it into integers into step values "1", "0", and "-1".