KR100420354B1 - Method for controlling fan of airconditioner - Google Patents

Abstract

The present invention relates to a method for controlling an indoor fan of an air conditioner, and more particularly, to an indoor fan of an air conditioner for improving the heating operation rate by controlling the indoor fan variably according to current operating conditions during heating operation. It relates to a control method. To this end, the present invention adjusts the indoor piping temperature to stop the indoor fan during the heating operation to less than 20 ℃, at this time to compensate for the indoor air volume to increase the heating operation rate, and also the outdoor temperature, compressor operating frequency, and indoor piping By controlling the air volume of the indoor fan according to the temperature, to prevent a sudden change in the indoor piping temperature.

Description

Indoor fan control method of air conditioner {METHOD FOR CONTROLLING FAN OF AIRCONDITIONER}

The present invention relates to a method for controlling an indoor fan of an air conditioner, and more particularly, to an indoor fan of an air conditioner for improving the heating operation rate by controlling the indoor fan variably according to current operating conditions during heating operation. It relates to a control method.

The air conditioner performs the cooling operation or the heating operation at the request of the user. According to these operating conditions, the heating cycle and the cooling cycle are driven, the room is warmly formed in the cold winter by the operation of the heating cycle, and the room is made cool in the hot summer by the operation of the cooling cycle.

The circulation cycle of the air conditioner configured as described above comprises a heating cycle when the indoor heat exchanger functions as a condenser and constitutes a cooling cycle when the indoor heat exchanger functions as an evaporator.

The heating operation by the heating cycle is performed by the refrigerant flowing in the indoor heat exchanger releasing heat to the indoor air and discharging warm wind to the indoor side. The cooling operation by the cooling cycle is performed by the refrigerant flowing in the indoor heat exchanger absorbing the heat of the indoor air and discharging the cool wind to the indoor side.

When the air conditioner performs the heating operation or the cooling operation, the indoor fan is driven to promote heat exchange between the refrigerant flowing in the indoor heat exchanger and the indoor air. The indoor fan sucks indoor air to the indoor heat exchanger side and forms an air flow for discharging the heat-exchanged air to the indoor side, thereby discharging the warmed or coolly converted air into the room, and the user feels a comfortable environment. will be

Next, a process of controlling an indoor fan during heating operation in a conventional air conditioner will be described with reference to FIG. 1.

When the operation command is input by the user, the controller (not shown) checks whether the heating operation is performed (step 100), and compares the indoor temperature with the desired temperature set by the user (step 103).

In step 103, when the room temperature is lower than the desired temperature set by the user, the controller operates the compressor to operate the above-described heating cycle (step 106). When the heating cycle is operated, the indoor heat exchanger is configured to create a comfortable environment while discharging warm wind.

However, immediately after the heating cycle is started, the refrigerant passing through the indoor heat exchanger is not yet heated. Therefore, when the heating cycle is operated and the indoor fan is operated at the same time, a phenomenon in which cold wind is discharged to the indoor side occurs. In this case, the user suspects the performance of the air conditioner by discharging cold wind despite the heating operation of the air conditioner, which causes a problem of lowering the reliability of the product.

Therefore, in the conventional air conditioner, even after the heating operation is performed, the operation of the indoor fan is controlled to the stopped state until the indoor piping temperature reaches a predetermined temperature or more.

That is, in the process of performing the heating operation according to the 106th step, the controller detects the temperature of the pipe passing through the indoor heat exchanger and determines whether the indoor pipe temperature has reached a predetermined temperature (a ° C.) or more. Step 109). When the condition of step 109 is not satisfied, the indoor fan is stopped (step 115), and when the condition of step 109 is satisfied after a predetermined time elapses after the heating operation is performed, the indoor fan is controlled to operate. (Step 112).

After the heating operation is performed, if a predetermined time has elapsed and the room temperature is higher than the desired temperature, the controller controls the operation of the compressor to be stopped (step 118). And even when the operation of the compressor is stopped, the indoor piping controls the indoor fan to the operating state at a predetermined temperature (b ° C.) or more so that the warm wind is circulated to the room (step 121 and step 124), and the predetermined temperature ( b ° C) or below, the indoor fan is controlled to a stop state (step 127).

That is, the conventional air conditioner controls the operation of the indoor fan at the time of heating operation based on the indoor piping temperature which is set constant. However, such a control method causes a problem that the indoor fan is always controlled to be in an off state when the heating operation is performed in a low temperature environment.

For example, when the heating operation is performed under a condition where the outdoor temperature is low, the heating capability of the air conditioner is inevitably deteriorated. In this case, the indoor piping temperature is difficult to rise in a short time, and thus the indoor fan is continuously turned off for a predetermined time or more, thereby preventing normal heating operation.

In other words, the heating operation of the air conditioner will be performed mostly in winter. However, depending on the region and country, the outside temperature of the air conditioner is different, and in this case, the heating capacity of the air conditioner is different. Therefore, the air conditioner that performs the heating operation in a region where the weather is relatively cold, the temperature decreases as a whole heating cycle, the indoor piping temperature is also relatively low due to this problem.

Therefore, when the heating operation is performed in a low temperature environment, the indoor piping temperature is often lower than the predetermined temperature (a ℃) set in step 109 of FIG. 1, and the indoor fan is always controlled to the off state every time. Due to the heating operation did not work properly. As a result, the conventional indoor fan control method causes a problem of lowering the heating operation rate while the heating operation is not normally performed in a low temperature environment.

In addition, the conventional indoor fan control method performs the control by a method of operating or stopping the indoor fan based on the predetermined temperature (a or b). At this time, the indoor fan is always controlled to the set air volume. Due to the control of the set air volume is a heat exchange between the indoor air and the refrigerant is rapidly made, thus causing a problem that the indoor piping temperature changes rapidly.

As a result, the conventional indoor fan control method causes a rapid heat change in the indoor piping temperature because it is always controlled by the set air volume, which results in frequent on / off operation of the indoor fan. Therefore, due to the frequent on / off operation of the indoor fan has caused a problem that the heating operation can not be made efficiently.

Accordingly, an object of the present invention is to provide a method for controlling an indoor fan of an air conditioner that can improve the heating operation rate by variably controlling the air volume of the indoor fan according to the current heating operation conditions.

1 is a flow chart of the indoor fan control of the air conditioner according to the prior art,

2 is a configuration diagram of a heating and cooling cycle of a general air conditioner,

3 is an indoor fan driving step according to the present invention,

4 to 8 is a flow chart of the indoor fan control according to the present invention,

9 is an indoor fan control condition table according to the present invention.

Explanation of symbols on the main parts of the drawings

1: indoor fan 3: condenser

7: indoor piping sensor 13: compressor

15: evaporator 19: outdoor temperature sensor

Indoor fan control method of the air conditioner according to the present invention for achieving the above object, to set the indoor piping temperature, outdoor temperature, and compressor operating frequency divided into several sections for the heating operation, which should be prioritized in each section Designating a condition and setting a set air volume correction value of the indoor fan meeting the condition; Detecting a current operating condition and a set air volume of the currently set indoor fan; Comprising a step of correcting the set air volume of the indoor fan in accordance with the current operating conditions of the set section. In addition, the indoor fan control method of the air conditioner according to the present invention, the indoor piping temperature during heating operation With the temperature raised above the predetermined maximum constant temperature, the outdoor temperature is below Y, the low temperature reference temperature (where Y <X, Y is -5 ° C), and the compressor is below the maximum operating frequency. A first process of controlling the indoor fan by lowering the indoor fan by one step at the set air volume; A second process of controlling the indoor fan to a set air volume when the outdoor temperature is less than Y degrees and the compressor is operated at a maximum operating frequency or more; A third step of controlling the indoor fan to a set air volume when the outdoor temperature is higher than Y degrees but lower than X degrees; A fourth step of controlling the indoor fan to a set air volume when the outdoor temperature is equal to or greater than X degrees and the compressor is operated at a lower operating frequency; If the outdoor temperature is more than X degrees, and the compressor is operated at the highest operating frequency or more, a fifth process of controlling the indoor fan by one step at a set air volume is included. The indoor piping temperature is 35 ° C. during the heating operation. In a state higher and lower than a predetermined maximum constant temperature, the method further includes a sixth process of performing a control of the indoor fan by lowering the airflow by two stages at the set air flow rate. The seventh process of determining whether the compressor is operated during the heating operation. It further comprises, The first to sixth process is to be controlled in the operating state of the compressor, in the stationary state of the compressor is controlled by the mild wind when the indoor piping temperature is above a predetermined maximum constant temperature, if less than the stationary state In the initial operation of the heating operation is started, the indoor fan is stopped when the indoor piping temperature is less than 30 ℃ And an eighth process of controlling the air conditioner. After the indoor fan is operated by the first to eighth processes, when the indoor piping temperature becomes less than the predetermined minimum constant temperature lower than the 30 ° C., the indoor And a ninth step of stopping the fan. A tenth step of minimizing the generation of noise by controlling light wind for a predetermined time when the indoor fan is switched from the stopped state to the operating state by the control of the ninth step. It is configured to further include.

Hereinafter, a method for controlling an indoor fan of an air conditioner according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram of a general air conditioner.

As shown in FIG. 2, the air conditioner is divided into an indoor unit and an outdoor unit, and the indoor unit is located on the indoor side during the heating operation, and has a condenser 3 for condensing the high temperature and high pressure gas refrigerant discharged from the compressor. In addition, in order to promote heat exchange between the indoor air and the refrigerant flowing in the condenser (3), and includes an indoor fan (1) for controlling the flow of air so that the warm air is discharged. In addition, the indoor pipe sensor 7 for detecting the temperature of the pipe passing through the condenser 3, and the indoor temperature sensor 5 for detecting the indoor temperature is further included.

The outdoor unit of the air conditioner includes a compressor 13 for compressing a refrigerant, an evaporator 15 for evaporating the condensed refrigerant, an outdoor fan 17 for blowing heat to the evaporator 15 to promote heat exchange, and And an outdoor temperature sensor 19 for outdoor temperature detection.

And a pipe 21 through which the refrigerant flows is installed between the indoor unit and the outdoor unit, the refrigerant flowing in the pipe 21 is a compressor (13) → condenser (3) → evaporator (15) → during heating operation Again circulated to the compressor (13). In addition, an expansion device 9 is provided between the condenser 3 and the evaporator 15 to control the temperature and pressure of the refrigerant condensed in the condenser. In addition, the air conditioner includes a four-sided side 11 for switching the circulation direction of the refrigerant compressed by the compressor 13 according to a cooling operation cycle or a heating operation cycle.

The following describes the heating operation control process in the air conditioner of the present invention configured as described above.

The circulating cycle of the refrigerant during the heating operation is switched from the four sides 11 by the control of a control unit (not shown), so that from the compressor 13 to the condenser 3 to the evaporator 15 to the compressor 13 again. Is determined.

Therefore, the refrigerant compressed by the compressor 13 is supplied to the condenser 3 on the indoor side to exchange heat with the indoor air. The heat exchange in the condenser 3 is generated between the refrigerant flowing through the pipe of the condenser 3 and the indoor air. That is, as the heat contained in the refrigerant is released to the indoor air side, the indoor air is controlled to a warm state including heat. The refrigerant deprived of heat from the condenser (3) is supplied to the evaporator (15) to cause evaporation to absorb heat contained in the outdoor air, and then flows back into the compressor (13) to repeat the process. will be.

On the other hand, the compressor 13 is operated at an operating frequency set under the control of a controller (not shown). The operating frequency of the compressor is determined based on various conditions depending on the operating conditions of the compressor. For example, the larger the difference between the compressor's off temperature and the room temperature is, the higher the target operation stage is, thereby increasing the operating frequency of the compressor. Therefore, the high operating frequency of the compressor means that the compressor operates at a high speed, and thus, the time for compressing the refrigerant is shortened.

When the heating operation by the operation of the compressor 13 is performed as described above, the control unit performs the control for setting the operating conditions of the indoor fan 1 as follows.

First, it is determined whether the heating is in operation (step 200), and it is determined whether the compressor 13 on the outdoor unit side is in an operating state (step 203).

When the compressor 13 is in the stopped state in step 203, the indoor fan 1 is operated in a mild wind only when the indoor piping temperature detected from the pipe sensor 7 of the indoor unit is higher than or equal to a predetermined temperature (ε ° C). (Step 206 and Step 209), the indoor fan 1 is controlled to a stop state when the indoor piping temperature is lower than the predetermined temperature (ε ° C). Then, the indoor fan hysteria flag is cleared (step 212).

However, when the compressor 13 is in operation in step 203, the operation of the compressor 13 and the indoor fan 1 are continuously driven to perform the indoor fan hysteresis control operation to increase the heating operation efficiency. The indoor fan hysteresis control means controlling the operation of the indoor fan according to the compressor operating state, the indoor piping temperature, and the current state of the indoor fan hysteria flag in order to prevent frequent on / off operation of the indoor fan. For example, while the compressor is stopped, the indoor fan is operated only when the indoor piping temperature is higher than or equal to the predetermined temperature (ε ° C.), and the indoor fan is not operated below. However, while the compressor is in operation, the indoor fan is operated at a temperature higher than the predetermined temperature (? At this time, the operating temperature range of the indoor fan is changed depending on whether the indoor fan hysteria flag is set in the previous process. First, the temperature (γ ° C.) at which the indoor fan hysteria flag is set is set, and when higher than the temperature, the indoor fan hysteria flag is set. When the indoor fan hysteria flag is in the setting state, the indoor fan is controlled to an operating state at a temperature (? ° C) or higher. However, when the indoor fan hysteria flag is released and cleared, the indoor fan is operated only at a temperature (γ ° C.) or higher even in the compressor operating state. That is, the indoor fan hysteresis control is to adjust the operating state of the indoor fan by the operation state of the compressor, the indoor piping temperature, the indoor fan flag setting state, etc. in order to prevent frequent on / off operation of the indoor fan. This indoor fan hysteresis control will be described in detail below.

First, in the initial control operation in which the heating operation is started, it is determined whether the indoor piping temperature detected from the indoor piping sensor 7 is equal to or higher than a predetermined temperature (δ ° C.) (step 215). When the indoor piping temperature is lower than the predetermined temperature (δ ° C.) in step 215, it is determined whether the indoor piping temperature is higher than the predetermined temperature (γ ° C.) (step 224).

That is, when the heating operation starts in the initial operation, if the condition of the step 224 is not satisfied in the operation state of the compressor 13, after checking whether the indoor fan hysteresis flag is not set (step 227), the indoor fan (1) is continuously turned off (step 230). The control operation prevents the cold wind caused by the drive of the indoor fan 1 from being discharged into the room during the initial heating operation.

In the state where the heating operation is performed as described above, after the predetermined time elapses after controlling the indoor fan 1 to the off state, the indoor piping temperature detected by the indoor piping sensor 7 is increased.

As the indoor piping temperature rises as described above, the step 215 is not satisfied. However, when the condition of the step 224 is satisfied, the indoor fan hysteresis is higher than the predetermined temperature (γ ° C.) and lower than the predetermined temperature (δ ° C.). After setting the flag (step 218), the indoor fan 1 is driven in mild wind (step 221).

That is, in step 221, the weak wind driving is set only by the indoor pipe temperature regardless of other conditions of the heating operation.

When the detected indoor piping temperature rises above the predetermined temperature (δ ° C.) and satisfies the condition of step 215, the flow proceeds to step 257.

On the other hand, the indoor piping temperature is lowered while the heating operation is continuously performed. That is, after the indoor fan hysteria flag is set, frost is generated by continuous heating operation, whereby the indoor piping temperature is lowered.

Therefore, if the pipe temperature detected from the indoor pipe sensor 7 is lower than the predetermined temperature (γ ° C.) and the indoor fan hysteria flag is set (step 227), it is determined whether the indoor pipe temperature is higher than the predetermined temperature (β ° C.). (Step 233).

When the condition of step 233 is satisfied, the indoor fan hysteresis flag is set, and the indoor piping temperature is higher than the predetermined temperature (β ° C) and lower than the predetermined temperature (γ ° C). At this time, it is determined whether the air volume of the indoor fan 1 is set to the weak wind (step 236). If the condition of the step 236 is satisfied, the air volume of the indoor fan 1 is controlled by the strong wind (step 242). Step), if the condition of step 236 is not satisfied, the air volume of the indoor fan 1 is controlled by weak wind (step 239).

However, in the step 233, if the indoor piping temperature is lower than the predetermined temperature (β ℃), it is determined again whether the indoor piping temperature is higher than the predetermined temperature (α ℃) (step 245). When the condition of step 245 is satisfied (indoor fan hysteresis flag is set, and the indoor piping temperature is higher than the predetermined temperature (α ° C) and lower than the predetermined temperature (β ° C)), control unit (not shown) The air volume of the indoor fan 1 is controlled by the ultra soft wind (step 248).

However, if the condition of step 245 is not satisfied, that is, the compressor is in an operating state and the indoor fan hysteria flag is also in a setting state, it is detected from the pipe sensor 7 due to frost on the pipe of the condenser 3. Indoor piping temperature is lowered below a predetermined temperature (α ℃). Therefore, at this time, the indoor fan is controlled to the off state while the indoor fan hysteria flag is cleared (steps 251 and 254).

That is, in steps 242, 239 and 248, the operation of the indoor fan 1 is controlled only by the indoor piping temperature regardless of the outdoor temperature and the operating frequency of the compressor. In spite of the heating operation which is continued when the outdoor temperature is low, the indoor piping temperature is gradually lowered due to the conception, and finally the control is performed to stop the indoor fan. Therefore, in the above step, in order to maintain the operation of the indoor fan, the air volume correction is performed to drop the indoor piping temperature as slowly as possible, thereby increasing the heating operation rate.

Next, in step 215, if the indoor piping temperature rises above a predetermined temperature (δ ° C.) during operation of the compressor, it is determined whether it is a hot start state in step 257. If it is determined in the step 257 that the hot start state, as shown in FIG. 8, the indoor fan 1 is controlled by a mild wind until the hot start is completed (steps 260 and 263). When the hot start is completed, the hot start state is terminated while the hot start flag is cleared (step 266).

That is, in steps 257 to 266, when the indoor piping temperature is relatively lower than the room temperature during the heating operation, the indoor fan is controlled by a mild wind to prevent the user from being strongly discharged into the room. Let's do it.

Next, in the step 215, when the indoor piping temperature rises above a predetermined temperature (δ ° C) during the operation of the compressor, and in the step 257 is not a hot start state, the indoor fan 1 is turned on in the off state In operation 270, the fan is operated in a mild wind for a predetermined time (about 20 seconds) to minimize noise generation by the fan at which operation starts (steps 273 and 276).

When the current operation mode is the artificial intelligence mode (step 279), the natural wind mode (step 282), or the sleep mode (step 285), the operation set according to each mode is performed (step 288). ).

When the indoor piping temperature is greater than or equal to the predetermined temperature (δ ° C.) in step 215 or when the compressor is turned off in step 291, the indoor fan 1 is controlled by light wind regardless of the operation frequency of the compressor. Step 294).

However, when the indoor piping temperature is above a predetermined temperature (δ ° C.) in step 215 and is not related to the various indoor fan hysterical irrational conditions (artificial intelligence mode according to step 279, natural wind mode according to step 282, In the sleep operation mode in step 285), it is determined whether the indoor piping temperature is higher than the predetermined temperature ([epsilon] C) (step 297).

In the case where the condition of step 297 is not satisfied, that is, when the indoor piping temperature is equal to or higher than the predetermined temperature (δ ° C.) or lower than the predetermined temperature (ε ° C.), the indoor fan is set regardless of the operating frequency of the compressor. Perform control of the steps. That is, as in step 300, if it is set to mild wind, it is operated with super weak wind (step 303), and if it is set to medium wind as in step 306, it is operated with mild wind (step 309), and in step 312, If it is set as a strong wind, as in the middle wind driving (step 315). That is, the steps 300 to 315 are described only when the air volume of the indoor fan 1 is set to strong wind, medium wind, and weak wind. As shown in FIG. 3, the air volume of the indoor fan is further increased. In the case of a plurality of stages, the proportional control is performed accordingly. In the control process of steps 303, 309, and 315, the indoors are based only on the indoor piping temperature regardless of the compressor operating frequency and the outdoor temperature. Fan control is being performed. At this time, the indoor fan is controlled to a low air volume two stages from the set air volume. This control is to prevent the indoor piping temperature from lowering by controlling the flow rate as low as possible because the current indoor piping temperature is not sufficiently raised. That is, the present invention is an invention for slowing down as much as possible the control of stopping the indoor fan at the end of the indoor piping temperature due to the low temperature despite the continued heating operation. Therefore, if the indoor piping temperature is not sufficiently increased, the control is performed such that the indoor piping temperature drops as slowly as possible by the above control. On the other hand, when the condition of step 297 is also satisfied, the compressor is in the operating state, Irrespective of the various indoor fan hysterical irrational conditions, when the indoor piping temperature is higher than the predetermined temperature (ε ° C.), the outdoor temperature and the operating frequency of the compressor are determined as the current heating operation conditions. That is, in the subsequent process, the indoor piping temperature is higher than the predetermined temperature (ε ° C.), and the indoor fan operation control is performed based on the outdoor temperature and the compressor frequency while the indoor piping temperature is sufficiently increased.

In the first indoor fan air flow setting example, the outdoor temperature detected by the outdoor temperature sensor 19 in step 318 is lower than the predetermined temperature (Y ° C.), which is a low temperature condition determination standard value, and the operating frequency of the compressor is higher than the maximum step (Z). (Step 321), the indoor fan 1 is controlled by the currently set air volume.

That is, as in step 350, when it is set to mild wind, it is driven by mild wind (step 353), and when it is set as medium wind as in step 356, it is driven by heavy wind (step 359), and in step 362, In the case of setting the strong wind as described above, the controller operates in a strong wind (step 365). In the control process of steps 353, 359, and 365, since the indoor piping temperature is elevated by a predetermined value or more, In addition, the indoor fan is controlled by the compressor operating frequency. At this time, since the outdoor temperature is lower than the predetermined temperature (Y ° C.) which is the low temperature condition reference temperature, the outdoor environment corresponds to the low temperature condition. Therefore, in this case, the rapid rise of the indoor piping temperature is difficult. However, since the compressor operating frequency is higher than the highest level (Z), the currently set indoor fan air flow rate is maintained as it is. In this process, the compressor is running fast at the highest operating frequency. That is, the maximum operating state of the compressor. Therefore, even if the indoor fan is controlled by the set air volume, the refrigerant compressed at high temperature and high pressure is rapidly circulated to suppress the decrease in indoor piping temperature as much as possible. In addition, the process is an indoor fan step one step higher than the second indoor fan air flow setting process described later.

As a second indoor fan air flow setting example, when the outdoor temperature detected from the outdoor temperature sensor 19 in step 318 is lower than the predetermined temperature (Y ° C), and the operating frequency of the compressor is less than the maximum step (Z) (step 321). ), The currently set air volume-to control the operation of the indoor fan (1) in one step.

That is, as in step 324, if it is set to weak winds, it is operated in super weak winds (step 327). If it is set to medium winds as in step 330, it is driven in strong winds (step 333), and step 336. If it is set as a strong wind as in the step is driven in a strong wind (step 339). In the step 327, 333, 339 control step, the compressor is not operated at the highest operating frequency, so compared with the first control step Therefore, the refrigerant compression time is relatively slow. Therefore, in this case, there is a fear that the speed at which the indoor piping temperature becomes lower than the first case becomes faster. Therefore, in the second control step, the indoor fan control is performed one step lower than the set air volume.

As a third indoor fan air flow setting example, when the outdoor temperature is above the predetermined temperature (Y ° C) and below the predetermined temperature (X ° C) (step 348), the operation of the indoor fan 1 is controlled by the currently set air volume. do.

That is, as in step 350 of FIG. 6, when the air is set to mild wind (step 353), when it is set as mid wind as in step 356, the motor is driven by heavy wind (step 359). In the third indoor fan control step, the outdoor temperature is out of the low-temperature condition when it is set to the strong wind as in the step (step 365). Therefore, in this case, general control is performed to control the indoor fan to the set air volume regardless of the compressor operating frequency.

Next, as the fourth and fifth indoor fan air volume control examples, when the outdoor temperature is higher than the predetermined temperature (X ° C), the operation frequency of the compressor is changed depending on whether the maximum stage Z is set (step 351).

If the operating frequency of the compressor is set in a condition below the highest stage, the operation of the indoor fan 1 is controlled by the currently set air volume.

That is, as in step 350 of FIG. 6, when the air is set to mild wind (step 353), when it is set as mid wind as in step 356, the motor is driven by heavy wind (step 359). If it is set to a strong wind as in the step (step 365). The indoor fan control process according to the fourth step, the compressor operating frequency is only different compared to the fifth control process described later. In this case, it is controlled by the set air volume.

However, when the operating frequency of the compressor is set to the highest stage, the air volume of the indoor fan is increased by one stage to control.

That is, as in step 368 of FIG. 7, when it is set as a strong wind, it is driven by super strong wind (step 371), and when it is set as medium wind as in step 374, it is driven by strong wind (step 377). If it is set to mild wind as in step 380, it operates in strong wind (step 383). In the control process of steps 371, 377, and 383, the outdoor temperature is maintained at a temperature lower than X degrees. Since it is completely off, and the compressor operating frequency is the highest, and the current indoor piping temperature is high, even if the control of one step higher than the set air flow is performed, a sudden drop in the indoor piping temperature does not occur. That is, the compressor continues to operate quickly, and the outdoor temperature is not low. Therefore, in this case, the control is performed one step higher than the set air volume. Accordingly, as can be seen from the diagram shown in FIG. 9, the present invention determines the indoor temperature, the indoor piping temperature, and the compressor operating frequency. The fan operation is controlled. This control prevents severe fluctuations in the indoor piping temperature and lowering the heating operation rate, which can be caused by the indoor fan being simply controlled by the set air volume. That is, the present invention provides a range of indoor piping temperature (δ ° C. or more). less than ε ° C), the indoor fan is controlled two levels lower than the set air flow regardless of the compressor operating frequency and outdoor temperature. In the present invention, when the indoor piping temperature is ε ° C or more, the outdoor temperature is less than Y, and the compressor is operated below the maximum operating frequency (Z), the indoor fan is controlled by one step from the set air volume. In the present invention, when the indoor piping temperature is ε ° C or more, the outdoor temperature is less than Y, and the compressor is operated at the maximum operating frequency (Z) or more, the indoor fan is controlled by the set air volume. In the present invention, when the indoor piping temperature is ε ° C or more, the outdoor temperature is Y or more, and the outdoor temperature is less than X degrees, the indoor fan is controlled by the set air volume regardless of the compressor operating frequency. In the present invention, when the indoor piping temperature is ε ° C or more, the outdoor temperature is X or more, and the compressor is operated below the maximum operating frequency (Z), the indoor fan is controlled by the set air volume. Finally and the present invention, when the indoor piping temperature is ε ℃ or more, the outdoor temperature is X degrees or more, and the compressor is operated at the highest operating frequency (Z) or more, the indoor fan is controlled by one step at the set air volume have. As described above, the present invention prevents a rapid change in the indoor piping temperature even in the heating operation which is continued by the sequential control of the indoor fan according to the current operating conditions. In the embodiment of the present invention, the constant value for the temperature is α. Is the minimum constant temperature of the indoor piping temperature preset for the control of the present invention 20 ℃, β is 26 ℃, γ is 30 ℃, δ is 35 ℃, ε is the highest of the preset indoor piping temperature for the control of the present invention As a constant temperature, 37 ° C is most preferable, X is 4 ° C, Y is -5 ° C, and the compressor operating frequency Z is preferably set to the maximum operating frequency.

Therefore, the present invention is characterized by adjusting the indoor piping temperature to stop the indoor fan during the heating operation to less than 20 ℃, at this time to improve the heating operation rate by correcting the indoor air volume to the ultra-light wind.

In addition, the present invention is characterized in that by controlling the air volume of the indoor fan according to the outdoor temperature, the compressor operating frequency, and the indoor piping temperature, to prevent a sudden change in the indoor piping temperature.

As described above, the indoor fan control method of the air conditioner according to the present invention, because the air volume of the indoor fan during the heating operation is adjusted according to the state of the outdoor temperature, the indoor piping temperature, the compressor operating frequency, the sudden fluctuation of the indoor piping temperature It is possible to control to prevent the possibility to improve the heating operation rate has the advantage. Therefore, the present invention can improve the performance of the product by improving the heating operation rate, and furthermore, the customer's product satisfaction effect is obtained.

Claims (7)

Setting the indoor piping temperature, the outdoor temperature, and the compressor operating frequency into several sections for heating operation, specifying the conditions to be prioritized in each section, and setting the set air volume correction value of the indoor fan according to the conditions. Wow; Detecting a current operating condition and a set air volume of the currently set indoor fan; The indoor fan control method of the air conditioner comprising the step of correcting the set air volume of the indoor fan according to the current operating conditions of the set section. At the time of heating operation, when the indoor piping temperature is raised above the predetermined maximum constant temperature, If the outdoor temperature is below the low-temperature reference temperature Y (where Y <X is the relationship and Y is -5 ° C), and the compressor is operated below the maximum operating frequency, the indoor fan is lowered by one step from the set wind volume. A first process of performing control; A second process of controlling the indoor fan to a set air volume when the outdoor temperature is less than Y degrees and the compressor is operated at a maximum operating frequency or more; A third step of controlling the indoor fan to a set air volume when the outdoor temperature is higher than Y degrees but lower than X degrees; A fourth step of controlling the indoor fan to a set air volume when the outdoor temperature is equal to or greater than X degrees and the compressor is operated at a lower operating frequency; The indoor fan control method of the air conditioner comprising a fifth step of performing a control to increase the indoor fan by one step at the set air flow rate when the outdoor temperature is more than X degrees, the compressor is operating above the maximum operating frequency. The method of claim 2, In a state in which the indoor piping temperature is higher than 35 ° C. and lower than the predetermined maximum constant temperature during the heating operation, the air conditioner further includes a sixth process of performing a control of the indoor fan by lowering the air by two stages at the set air volume. Fan control method. The method of claim 2 or 3 wherein: Further comprising a seventh process of determining whether the operation of the compressor during the heating operation, The first to sixth processes are controlled in an operating state of the compressor, and in the stopped state of the compressor, when the indoor piping temperature is higher than or equal to a predetermined maximum predetermined temperature, it is controlled by light wind, and when it is less than, it is controlled by the stopped state. Indoor fan control method of air conditioner. The method of claim 4 wherein: In the initial operation of the heating operation is started, the indoor fan control method of the air conditioner further comprises an eighth step of controlling the indoor fan in a stopped state when the indoor piping temperature is 30 ℃ or less. The method of claim 5 wherein: After the indoor fan is operated by the first to eighth process, when the indoor piping temperature is less than the predetermined minimum constant temperature lower than the 30 ℃, it further comprises a ninth process for stopping the indoor fan Indoor fan control method of air conditioner. The method of claim 6 wherein: The indoor fan control method of the air conditioner further comprises a tenth step of minimizing the generation of noise by controlling the mild wind for a predetermined time when the indoor fan is switched from the stop state to the operating state by the control of the ninth process .