KR20020017086A - Compressor control method of air conditioner - Google Patents

Abstract

PURPOSE: A compressor control method of air conditioner is provided to improve operation factor of a compressor and to increase the efficiency of cooling operation in low temperature. CONSTITUTION: A compressor control method includes three steps. The first step(107) is to detect the temperature of air discharged to a room. The second step(211) is to determine whether the detected temperature satisfies low temperature condition. The third step(311) is to control to lower the driving frequency of a compressor on operation of the low temperature condition and to indicate that the operating frequency of the compressor is changed. The low temperature condition of the temperature of discharged air is that the detected temperature of discharged air is higher than the freezing temperature of a heat exchanger by a certain value. The driving frequency of the compressor is lowered on low temperature condition to delay the freezing of the heat exchanger.

Description

Compressor control method of air conditioner

The present invention relates to a compressor control method for an air conditioner, and more particularly, to a compressor control method for an air conditioner for adjusting the rotation speed of a compressor by using a temperature discharged into a room.

An air conditioner is a device for maintaining indoor air in a state most suitable for use and purpose. For example, in summer, the room is cooled to cool and in winter, the room is heated to warm. In addition, the air conditioner controls the humidity of the room, it is also possible to adjust the indoor air to a comfortable clean state. This convenience of air conditioners has led to a wider variety of products being used and expanded, and consumers are naturally demanding higher energy use efficiency, better performance and convenient products.

The product developed to meet these demands is an inverter air conditioner. The inverter air conditioner converts an AC voltage input into the DC voltage, and then converts the AC voltage into an AC voltage to be used as a driving power source of the compressor. Therefore, the air conditioner detects an input AC voltage, sets the compressor operating frequency accordingly, and operates on the principle of generating the driving voltage of the compressor in proportion to the set operating frequency.

Then, a conventional air conditioner will be described with reference to the accompanying drawings.

1 shows a configuration diagram for an air conditioner control. In the following description, an air conditioner is applied to an air conditioner that is a cooling device.

In general, the air conditioner includes an indoor unit 10 and an outdoor unit 13. The indoor unit 10 includes an evaporator 11, and the outdoor unit 13 includes a compressor 17 and a condenser 15. The indoor unit 10 and the outdoor unit 13 have a built-in microcomputer (not shown) for controlling each configuration. The microcomputer has a communication unit (not shown) capable of transmitting and receiving data to control each other.

It looks at the operation of the air conditioner having the above configuration.

When the user sets the temperature through the input device provided in the indoor unit 10, the set temperature is recognized by a microcomputer (not shown) on the indoor unit 10 side. The microcomputer transmits the recognized information to the outdoor microcomputer using a communication unit (not shown). The microcomputer on the outdoor unit 13 side sends a control signal for driving the compressor to a compressor driver (not shown) to drive the compressor 17. Then, when it is detected that the room temperature has reached the set temperature, the indoor unit 10 side microcomputer sends a signal to the outdoor unit 13 side microcomputer using a communication unit (not shown) and the outdoor unit 13 side. The microcomputer sends a stop control signal to the compressor driver (not shown) to stop the compressor 17.

In this way, the compressor 17 is driven by the microcomputer on the outdoor unit 13 side of the air conditioner. The microcomputer controlling the operation is operated by the input program control procedure.

2 is a block diagram for controlling the air conditioner according to the prior art.

The microprocessor unit 20 detects a signal output from the room temperature detection unit 25 for detecting an indoor temperature and a signal output from the pipe temperature detection unit 21 for detecting a pipe temperature so that the compressor 17 is Command to perform driving action.

Hereinafter, the operation of the air conditioner having the above configuration will be briefly described with reference to FIG. 3.

When the user sets the desired temperature in the air conditioner and inputs a signal for operation, the air conditioner checks whether the air conditioner is currently in cooling operation (step 100). When the cooling operation is confirmed, the indoor temperature detected by the indoor temperature detecting unit 25 is compared with a desired temperature set by the user (step 105).

At this time, after the air conditioner is driven, since the cooling operation is not sufficiently performed during the initial operation, the room temperature becomes higher than the desired temperature, and the process proceeds to the next step 107. In step 107, the pipe temperature detecting unit 21 outputs the pipe temperature detected by the sensor in the pipe to the microcomputer 20.

Whether or not the next step (X1 minute) has elapsed (step 109) also proceeds to step 113 because a predetermined time has not passed after the air conditioner is driven. In step 113, it is determined whether the compressor is operated. Since the compressor is not operating to date, the process proceeds to step 213 in which the pipe temperature is compared with the predetermined temperature (T2 ° C.). At this time, the pipe temperature is higher than the predetermined temperature (T2 ° C.) for driving the compressor since the compressor is driven, and thus the microcomputer 20 outputs a signal for operating the compressor 17 (step 115).

In this process, while the compressor 17 is driven and the cooling state is in progress, the microcomputer 20 repeatedly performs on / off control of the compressor based on the operation flowchart shown in FIG. 3.

That is, it is checked whether the cooling operation is performed in step 100. If not, the process proceeds to step 303 where the compressor 17 is stopped. Since the air conditioner is in the cooling operation by the operation of the compressor 17 in the 115th step, the air conditioner proceeds to a 105th step of comparing the room temperature with the desired temperature.

In step 105, a desired temperature set by the user is compared with a room temperature. If the room temperature is less than the desired temperature, the room temperature has reached the set temperature requested by the user. Therefore, the process proceeds to step 303 to stop the compressor 17, and the compressor is stopped. In the step 105, if the room temperature is greater than the desired temperature, the user has not yet reached the temperature required by the user and proceeds to the next step, step 107.

In step 107, the pipe temperature detection unit 21 reads the pipe temperature and transmits data to the microcomputer. Next, in step 109, the controller detects how much time has passed since the compressor was operated. How much time is required to change the room temperature, so check whether the predetermined time has elapsed in the step.

When a predetermined time (X1 minute) has elapsed in step 109, the flow proceeds to step 111 and a pipe temperature is compared with a predetermined temperature T1 ° C. However, if the predetermined time has not passed, the process proceeds to step 113 of determining whether the compressor 17 is operated.

In step 111, if the pipe temperature is less than T1 ℃, proceeds to step 303 to stop the compressor (17). However, if the pipe temperature is greater than the predetermined temperature (T1 ° C.) in step 111, the process proceeds to step 113 for determining whether the compressor is currently running and maintains the operation of the compressor since the compressor is currently in operation (step 115). .

That is, in step 111, after the compressor is driven for a predetermined time (X1) or more, in order to prevent the heat exchanger (evaporator, condenser) from freezing due to the temperature difference between the high temperature and high pressure refrigerant and air circulated on the refrigeration cycle, This is to monitor the point of time when the heat exchanger is frozen (T1 ℃). Therefore, the conventional air conditioner monitors the time point T1 at which the heat exchanger freezes by comparing the temperature data detected through the pipe temperature sensing unit 21 with the predetermined temperature T1 as a reference (step 111). At this point of time, the operation of the compressor 17 is temporarily stopped.

However, conventional air conditioners have exposed the following problems.

When the conventional air conditioner controlled by the above process is placed in a low temperature condition, the number of times of stopping the compressor 17 becomes frequent by comparing the pipe temperature according to the step 111 with a predetermined temperature (T1 ° C.). will be. That is, when the air conditioner is in a low temperature condition, the temperature of the pipe is also relatively low, so that the time to reach the reference temperature (T1 ° C.) set in step 111 is faster. Therefore, the number of stops of the compressor 17 increases according to the comparison value between the piping temperature according to the step 111 and the predetermined temperature (T1 ° C).

Such frequent stops of the compressor 17 reduce the operating time of the compressor 17, and consequently cause a problem of significantly lowering the cooling efficiency.

Accordingly, an object of the present invention is to provide a compressor control method of an improved air conditioner which improves the compressor operation rate and increases the cooling operation efficiency at low temperature conditions.

Another object of the present invention is to provide a compressor control method of an air conditioner for displaying an operating state of a compressor under low temperature conditions.

1 is a configuration diagram of a general air conditioner,

2 is a block diagram of an air conditioner according to the prior art,

3 is a flow chart of an air conditioner according to the prior art,

4 is a configuration diagram of an air conditioner according to the present invention;

5 is a flow chart of an air conditioner according to the present invention.

Explanation of symbols on the main parts of the drawings

10: indoor unit 11: evaporator

13: outdoor unit 15: condenser

17 compressor 20 microcomputer

21: pipe temperature detection unit 22: discharge temperature detection unit

23: power supply unit 25: room temperature detection unit

27: LED driver

Compressor control method of the air conditioner according to the present invention for achieving the above object comprises the steps of detecting the temperature of the air discharged into the room; Determining whether the discharge temperature is included in a low temperature condition; And converting and controlling the driving frequency of the compressor during the low temperature condition operation.

The invention further comprises the step of the compressor indicating that the operating frequency is variably controlled.

The low temperature condition of the discharge temperature of the present invention is characterized in that the detected discharge temperature is a time point as high as a predetermined time from the freezing time of the heat exchanger.

Hereinafter, a compressor control method of an air conditioner according to the present invention will be described in detail with reference to the accompanying drawings.

4 is a block diagram of an air conditioner according to the present invention.

As shown in FIG. 4, the present invention provides a microcomputer unit 20 for controlling driving of a compressor based on detection values of a discharge temperature detector and a room temperature detector described below, and a discharge detector for detecting a temperature discharged into the room. A temperature sensing unit 22, an indoor temperature sensing unit 25 for detecting an indoor temperature, a light emitting diode driving unit 27 for driving to display an operation state of a compressor which operates by changing the rotational speed during low temperature conditions; And a power supply unit 23 for supplying power to the microcomputer.

In the present invention, it characterized in that it comprises a discharge temperature detecting unit 22 for detecting the temperature of the air discharged into the room. In addition, the present invention is characterized in that it further comprises a light emitting diode driver (27) for controlling the operation of the light emitting diode to drive to display the operating state of the compressor to operate by changing the rotational speed at low temperature conditions.

That is, the temperature value detected using the discharge temperature detecting unit 22 is applied to a microcomputer (not shown) on the indoor unit 13 side through a communication unit (not shown). The indoor computer 13 side microcomputer (not shown) sends a signal to the outdoor unit side microcomputer, and the microcomputer (not shown) finally determines whether the compressor is driven, stopped or not. Then, the compressor is driven by sending a signal to the compressor driver (not shown). In addition, the microcomputer (not shown) operates by determining whether the compressor is driven at a low temperature condition and sending a signal to the LED driver 27 to display the driving state of the compressor.

Next, a compressor control process of an air conditioner according to the present invention having the above configuration will be described in detail with reference to the accompanying drawings.

5 is a flowchart illustrating a compressor control process of the air conditioner according to the present invention.

When the air conditioner is initially driven, the microcomputer 20 first checks whether the air conditioner is in the cooling operation or the heating operation (step 100). If it is determined that the cooling operation is in step 100, the process proceeds to step 105, which is the next step. If the cooling operation is not performed in step 100, the compressor is controlled in a stopped state and the system is terminated (step 303).

In step 105, the indoor temperature and the desired temperature are compared. Since the air conditioner is currently running for the first time, it can be seen that when the desired temperature is compared with the room temperature, the room temperature will be larger. Therefore, the flow proceeds to the next step, step 107. Step 107 detects the temperature of the air discharged into the room using the discharge temperature detecting unit 22 of the present invention. Then, the detected discharge temperature is read and the value is sent to the microcomputer 20.

In the next step 109, it is checked whether a predetermined time (X1 minute) has elapsed. Since the air conditioner operates for the first time and a predetermined time (X1 minute) has not passed, the process proceeds to the next step, step 113.

In step 113, it is determined whether the compressor is operated. Since the 113th stage is also the first driving, it can be seen that the compressor is not operating.

Therefore, the flow proceeds to the next step 213. In the present step, it is determined whether the compressor is driven by comparing the discharge temperature detected by the discharge temperature detector with a predetermined temperature (T2 ° C.). When the discharge temperature is greater than the predetermined temperature (T2 ℃) in step 213, the process proceeds to step 115 to control the operation of the compressor with a predetermined number of revolutions.

The microcomputer unit 20 repeatedly performs the above process for proper on / off of the compressor even after cooling is performed while the compressor is operated.

Since the air conditioner is in the cooling operation in step 100, the process proceeds to step 105, which is the next step. In step 105, the indoor temperature and the desired temperature are compared. If the desired temperature is greater, it is recognized that the temperature corresponding to the user's request is maintained, and step 303 of stopping the compressor is performed, and the light emitting diode maintains the OFF state.

However, if the room temperature is greater in step 105, the process proceeds to step 107. In step 107, the discharge temperature measured by the discharge temperature detector 21 is read. The flow then proceeds to step 109. In step 109, it is determined whether a predetermined time (X1 minute) has elapsed. The step 109 is to wait for a predetermined time to elapse after driving the compressor.

When the predetermined time (X1 minute) condition in step 109 is satisfied, the discharge temperature detected in step 107 is compared with the predetermined temperature T (step 111). When the discharge temperature is less than the predetermined temperature T in step 111 and greater than the predetermined temperature T1 (step 211), it is determined that the low temperature condition. Therefore, the drive frequency of the compressor is lowered to keep the compressor running. In operation 311, the light emitting diode is turned on. That is, in step 311, the driving frequency of the compressor is reduced under low temperature conditions so that the cooling operation can be continuously performed.

That is, step 211 recognizes that the heat exchanger may freeze when the compressor continues to operate at the rotation speed set in step 115 when the compressor is in operation, and reduces the set rotation speed of the compressor to It can be seen that it is a step of slowing down the time to reach the freezing point.

When the control process is performed and a predetermined time has elapsed, since the discharge temperature is continuously lowered, the discharge temperature range reaches a range lower than the predetermined temperature T1 (step 211). Therefore, in this case, the compressor is stopped and the light emitting diode 27 is turned off (step 411). The above step means that the discharge temperature has reached the freezing point of the heat exchanger, it can be seen that the operation of the compressor is stopped.

However, if the discharge temperature is higher than T in step 111, the flow proceeds to step 113 to determine whether the compressor is in operation. When the compressor is in operation in step 113, the compressor is operated according to the set rotation speed. In this case, the light emitting diode is turned off.

As described above, the compressor control method of the air conditioner according to the present invention is

By using the discharge temperature detection unit for detecting the temperature of the air discharged into the room is characterized by delaying the time to reach the freezing of the heat exchanger by lowering the frequency of the compressor to operate under a certain temperature under a low temperature condition. Therefore, it is possible to reduce the frequent compressor stop state for preventing the freezing of the heat exchanger, it is possible to improve the efficiency of cooling and the operation rate of the compressor.

In addition, the present invention has an advantage that the user can easily check the state of the compressor by displaying the state of the operation of the compressor of the air conditioner using a light emitting diode.

Claims (3)

Detecting a temperature of air discharged into the room; Determining whether the discharge temperature is included in a low temperature condition; Compressor operation control method of the air conditioner comprising the step of controlling by controlling the drive frequency of the compressor during the low temperature operation. The method of claim 1, And controlling the compressor to display a variable frequency of operation. The method according to claim 1 or 2, The low temperature condition of the discharge temperature is a control method of the air conditioner, characterized in that the detected discharge temperature is a time point as high as a predetermined time from the freezing time of the heat exchanger.