KR102203213B1 - A control method for air conditioner - Google Patents

Abstract

The present invention relates to a control method of an air conditioner in which a plurality of indoor units supplied with a refrigerant from an outdoor unit are provided in each room and are controlled differently according to an operation pattern of each room.
The present invention is a trial run step in which a first pattern item including a stabilization arrival time and an opening degree when stabilization is reached for supplying a refrigerant to each indoor unit while a plurality of indoor units are all operated, and the trial run step Adjust the opening degree of each indoor electronic expansion valve by using the stabilization primary pattern item stored in, and operate all of the plurality of indoor units using the adjusted opening degree to achieve the stabilization and stabilization time of the indoor electronic expansion valve. The initial opening degree and the indoor unit target superheat degree of each of the indoor electronic expansion valves are determined by using the re-operation step in which the secondary pattern items including the opening degree are memorized, and the first and second pattern items memorized through the trial operation and re-operation steps. And a normal operation step of operating each indoor unit using the determined initial opening degree and the determined superheat degree.
According to the present invention, the entire indoor unit can be stabilized more quickly.

Description

Control method of air conditioner {A control method for air conditioner}

The present invention relates to a control method of an air conditioner in which a plurality of indoor units supplied with a refrigerant from an outdoor unit are provided in each room and are controlled differently according to an operation pattern of each room.

An air conditioner is a device for maintaining the air in a predetermined space in the most suitable state according to the use and purpose. In general, the air conditioner includes a compressor, a condenser, an expansion device, and an evaporator, and a refrigerant cycle that compresses, condenses, expands, and evaporates the refrigerant is driven to cool or heat the predetermined space. .

The predetermined space may be proposed in various ways depending on the location where the air conditioner is used. For example, when the air conditioner is disposed in a home or office, the predetermined space may be an indoor space of a house or building. On the other hand, when the air conditioner is disposed in a vehicle, the predetermined space may be a boarding space for a person to ride.

When the air conditioner performs a cooling operation, an outdoor heat exchanger provided in the outdoor unit functions as a condenser, and an indoor heat exchanger provided in the indoor unit functions as an evaporator. On the other hand, when the air conditioner performs a heating operation, the indoor heat exchanger functions as a condenser and the outdoor heat exchanger functions as an evaporator.

In detail, the air conditioner includes an outdoor heat exchanger, an inlet pipe for guiding the inflow of refrigerant to the outdoor heat exchanger, and an outlet pipe for guiding the flow of the refrigerant passing through the outdoor heat exchanger. In addition, an outdoor fan is provided on one side of the outdoor heat exchanger.

The outdoor heat exchanger may be provided with a plurality of heat exchange units, and the refrigerant flows in after being branched through the inlet pipe to exchange heat with outside air.

Further, a flow control unit for adjusting the amount of refrigerant is provided at the outlet side of each heat exchange unit.

That is, the refrigerant passing through the flow controller may flow to the indoor heat exchanger through the outlet pipe.

Meanwhile, as described above, the amount of refrigerant flowing to the indoor heat exchanger is controlled by the indoor electronic expansion valve.

1 to 3 are diagrams and graphs for showing an indoor unit start-up and operation control state of an air conditioner according to the prior art.

Referring to these drawings, the outdoor unit 10 of the air conditioner may be connected to a plurality of indoor units 20, 30, and 40 through a connection pipe.

In addition, the indoor units 20, 30, and 40 are provided with indoor electronic expansion valves 22, 32, and 42 for adjusting the amount of refrigerant used for air conditioning supplied, respectively.

In addition, the indoor units 20, 30, and 40 may be installed in separate spaces. In the referenced drawings, the indoor unit 20 in Room 1, the indoor unit 30 in Room 2, and the indoor unit 40 in Room 3 are provided. It is equipped.

Meanwhile, the rooms 1 to 3, which are spaces where air conditioning is performed, have different air conditioning areas. In addition, since the rooms 1 to 3 may be spaces for different purposes, the required load may be different in each room.

However, in the prior art, when each indoor unit controls the air conditioning space divided as described above, the starting operation is performed while all the openings of the indoor electronic expansion valves are equally adjusted. In addition, after the starting operation is completed, normal operation is performed according to the purpose of the air conditioning space while adjusting the opening degree of the indoor electronic expansion valve.

Therefore, it takes a long time to stabilize the circulation cycle of the refrigerant in Room 3, which is a relatively large space compared to Room 1 and Room 2, which are relatively narrow spaces.

An object of the present invention is to control an air conditioner in which each indoor unit is controlled differently from initial start-up by storing a stabilization operation pattern for each air conditioning space using operation information for a certain period of time, and using the stored stabilization operation pattern. To provide a way.

The present invention is a trial run step in which a first pattern item including a stabilization arrival time and an opening degree when stabilization is reached for supplying a refrigerant to each indoor unit while a plurality of indoor units are all operated, and the trial run step Adjust the opening degree of each indoor electronic expansion valve by using the stabilization primary pattern item stored in, and operate all of the plurality of indoor units using the adjusted opening degree to achieve the stabilization and stabilization time of the indoor electronic expansion valve. The initial opening degree and the indoor unit target superheat degree of each of the indoor electronic expansion valves are determined by using the re-operation step in which the secondary pattern items including the opening degree are memorized, and the first and second pattern items memorized through the trial operation and re-operation steps. And a normal operation step of operating each indoor unit using the determined initial opening degree and the determined superheat degree.

In the commissioning and re-operation steps, while operating for a set period of time, stabilization is achieved when the change in high and low pressure for 1 minute is 200 kpa or less, the change in the opening degree of the indoor electronic expansion valve is 30 pls or less, and the frequency change of the compressor is 3 Hz or less It is characterized by determining that it is.

In the re-operation step, the re-operation weight using the stabilization arrival time is assigned to the opening degree of each indoor electronic expansion valve memorized in the trial operation step, so that the opening degree of each indoor electronic expansion valve is adjusted.

The re-operation weight for each indoor electronic expansion valve is set as a stabilization arrival time of each indoor electronic expansion valve per an average time of reaching stabilization of all indoor electronic expansion valves stored in the trial operation step.

The re-operation weight for each indoor electronic expansion valve is limited to a range of 0.5 to 1.5.

In the normal operation step, the opening degree of the initial indoor electronic expansion valve is determined as a product of the average opening degree of each indoor electronic expansion valve memorized in the test operation and re-operation steps per capacity of the total indoor unit and the capacity of each indoor unit. do.

In the normal operation stage, the indoor unit target superheat degree is determined by multiplying the normal operation weight based on 2°C, and the normal operation weight is the stabilization of each indoor electronic expansion valve in the trial operation and re-operation stages per total indoor stabilization average time. It is characterized in that it is determined by the average of the arrival time.

The normal operation weight for each indoor electronic expansion valve is characterized in that it is limited to a range of 0.5 to 1.5.

According to the present invention, a stabilization operation pattern of an indoor unit installed in each air conditioning space is stored, and an initial opening degree of each indoor electronic expansion valve is determined using the stored stabilization operation pattern. In addition, there is an advantage in that each indoor unit can reach the required load faster by performing an initial starting operation according to the determined initial opening degree.

In addition, even after the initial start-up operation, the target superheat degree of each indoor unit is set differently for each indoor unit using the cooling base temperature and the average stabilization time according to the stabilization operation pattern. Therefore, it has the advantage that the stabilization of the entire indoor unit can be made faster.

1 to 3 are diagrams and graphs for showing an indoor unit starting and operation control state of an air conditioner according to the prior art.
Figure 4 is a flow chart showing the control process of the air conditioner according to the present invention.
5 and 6 are diagrams and graphs for showing a test operation state of the air conditioner according to the present invention.
7 and 8 are views and graphs for showing a reoperation state of the air conditioner according to the present invention.
9 and 10 are diagrams and graphs for showing a normal operating state of the air conditioner according to the present invention.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. However, the spirit of the present invention is not limited to the presented embodiments, and those skilled in the art who understand the spirit of the present invention will be able to easily propose other embodiments within the scope of the same idea.

4 is a flowchart showing a control process of the air conditioner according to the present invention.

Referring to the drawings, the air conditioner according to the present invention stores a driving pattern until stabilization is reached by operating the entire indoor unit multiple times, and uses the stored pattern to be controlled differently from initial start to normal operation.

To this end, the control method of the air conditioner according to the present invention includes a test operation step (S100) for storing an initial operation pattern, and a material for adjusting and re-measurement of the operation pattern using the information measured by the test operation step (S100). A normal operation step (S300) of controlling the indoor unit for each air conditioning space by using the average value of the measurement information in the operation step S200 and the test run step S100 and the reoperation step S200 is included.

In detail, in the commissioning step (S100), the number of blowing fan lines of the outdoor unit is maximally controlled in a state in which the opening degree of the supercooling expansion valve is fully opened.

In the above state, when cooling, the outdoor electronic expansion valve is fully open so that the refrigerant can be sufficiently supplied to the indoor unit. When heating, the outdoor unit suction superheat of the outdoor electronic expansion valve is 5℃. To control the amount of refrigerant movement.

Here, the suction superheat of the outdoor unit is the temperature of the suction pipe immediately before the compressor minus the temperature of the evaporator discharge pipe. When the amount of refrigerant injected is appropriate, the stabilization temperature of the system is measured as 5°C.

Meanwhile, while the above-described control is being performed, in the commissioning step (S100), the following information is checked for a set time to determine stabilization. In this embodiment, the set time for measurement is set to 1 hour.

That is, in the present embodiment, for 1 hour in the trial operation step (S100), first, is the change in high and low pressure 200 kpa/1 minute or less, second, is the change in the opening degree of the indoor electronic expansion valve 30 pls/1 minute or less, third , Check if the compressor frequency change is less than 3Hz/1min.

If all three items are satisfied, it is determined as a stabilization state, and the opening degree of the indoor electronic expansion valve and the stabilization arrival time of the indoor electronic expansion valve until reaching the stabilization state are stored as a first pattern.

Meanwhile, the first pattern may appear differently for each indoor unit. That is, when there is a difference in factors such as the area and structure of each air conditioning space, the required load for each air conditioning space appears differently, and accordingly, the first patterns stored in the trial operation step (S100) are all different. appear.

5 and 6 are diagrams and graphs for showing a test operation state of the air conditioner according to the present invention.

Referring to these drawings, in the case of the trial operation step (S100), each of the indoor units 200, 210, 220 installed in rooms 1 to 3 of different areas are indoor electronic expansion valves 202, 212, 222 during startup operation. The opening degree of) starts the same at 600 pls. And, after starting operation, until the stabilization state is reached, it is controlled according to the degree of superheat, respectively, and the time at which the stabilization starts to be reached is measured and stored as “A_1, B_1, C_1”, respectively.

In addition, the opening degrees "a_1, b_1, c_1" of the above and each of the indoor electronic expansion valves 202, 212, and 222 in a stabilized state are measured and stored together with the stabilization arrival time.

That is, in the commissioning step (S100), a stabilization arrival time and an opening degree of the indoor electronic expansion valves 202, 212 and 222 are stored as the first pattern.

On the other hand, after the first pattern is stored as described above, the stored indoor electronic expansion valves 202, 212, 222 are re-read using the stabilization opening degrees "a_1, b_1, c_1" and stabilization arrival times "A_1, B_1, C_1". The driving step (S200) is performed.

7 and 8 are diagrams and graphs for showing the reoperation state of the air conditioner according to the present invention.

Referring to these drawings, in the re-operation step (S200), the opening degrees of each of the indoor electronic expansion valves 202, 212, and 222 are set as follows using the first pattern stored in the test-run step (S100).

That is, the stabilization time for each indoor unit (200, 210, 220) can be shortened by assigning a re-run weight to the stabilization opening degree of the primary pattern, and the re-run weight (first stabilization time/1st total stabilization average time) ) Value is limited to 0.5 or more and less than 1.5.

The re-run weight range as described above is to prevent the inflow amount of refrigerant from being too small, the efficiency is low compared to the amount of refrigerant supplied, or to prevent an obstacle to the normal operation of the air conditioner, and the range of the re-run weight is limited as described above. By doing so, it is possible to shorten the stabilization time within a stable operating range.

On the other hand, when the re-operation weight is assigned as described above and the re-operation step (S200) is performed, the opening and stabilization time of each of the indoor electronic expansion valves 202, 212, and 222 are stored and stored as a second pattern. The storage information is displayed differently depending on the area and structure of the installation space of each of the indoor units 200, 210, and 220.

That is, in the present invention, through the trial operation step (S100) of all installed indoor units (200, 210, 220), the stabilization opening degree of the indoor electronic expansion valves (202, 212, 222) and the time required for stabilization are identified, and using this In the re-operation step (S200), the indoor electronic expansion valves 202, 212, and 222 are individually given a re-operation weight to shorten the stabilization time for each installation space in the re-operation step (S200).

And, after the first pattern and the second pattern are stored as described above, the initial opening degree of the indoor electronic expansion valves 202, 212, 222 is determined using the average value of the first pattern and the second pattern, and each indoor unit A target superheat degree of (200, 210, 220) is determined, and a normal operation step (S300) controlled using this is performed.

9 and 10 are diagrams and graphs for showing a normal operating state of the air conditioner according to the present invention.

Referring to these drawings, in the normal operation step (S300), the opening degrees of the initial indoor electronic expansion valves 202, 212, and 222 are determined as follows.

And, as the opening degree of the initial indoor electronic expansion valve is determined as described above, when each of the indoor units 200, 210, 220 is operated for normal operation, starting operation is performed at a different opening degree, thereby reducing noise or Cooling/heating capacity can be improved.

Meanwhile, in the normal operation step S300, the target superheat degree is determined as follows.

Here, 2°C, which is the reference temperature of the indoor unit target superheat setting, is the basic cooling target temperature, and the normal operation weight according to stabilization at the basic cooling target temperature (1st and 2nd indoor electronic expansion valve stabilization average time / total indoor stabilization average) Time).

In addition, the normal operation weight is also limited to a range of 0.5 to 1.5, similar to the reoperation weight, so that the operation of the air conditioner can be performed within a stable control range.

In the end, according to the present invention, the driving pattern according to the installation space of each indoor unit 200, 210, 220 is stored through the test operation step (S100) and the reoperation step (S200), and the indoor electronic device is used using the stored pattern information. By setting the initial opening degree and the target superheat degree of the expansion valves 202, 212, and 222, each indoor unit 200, 210, 220 can be controlled differently from the starting operation. Therefore, in the normal operation step S300, each of the indoor units 200, 210, 220 may be stabilized in a faster time.

200,210,220. Indoor unit 202,212,222. Indoor electronic expansion valve
S100..... commissioning step S200..... re-running step
S300..... Normal operation stage

Claims (8)

A trial run step of storing a first pattern item including a stabilization arrival time of each indoor electronic expansion valve for supplying a refrigerant to each indoor unit while the plurality of indoor units are all operated and an opening degree when the stabilization is reached;
The opening degree of each indoor electronic expansion valve is adjusted using the stabilization primary pattern item memorized in the trial operation step, and all the plurality of indoor units are operated using the adjusted opening degree to determine the stabilization arrival time of the indoor electronic expansion valve. A re-driving step in which a secondary pattern item including an opening degree is stored upon reaching stabilization;
The initial opening degree and the indoor unit target superheat degree of each of the indoor electronic expansion valves are determined by using the first and second pattern items memorized through the trial operation step and the re-operation step, and each Including; a normal operation step in which the indoor unit is operated,
In the re-operation step, the opening degree of each indoor electronic expansion valve is adjusted by assigning a re-operation weight using the stabilization arrival time to the opening degree of each indoor electronic expansion valve stored in the trial operation step. Way.
The method of claim 1, wherein in the commissioning step and the reoperating step,
While operating for a set period of time, if the change in high and low pressure for 1 minute is 200 kpa or less, the change in the opening degree of the indoor electronic expansion valve is less than 30 pls, and the frequency change of the compressor is less than 3 Hz, the air conditioner judged to have stabilized Control method.
delete The method of claim 1, wherein the re-operation weight for each indoor electronic expansion valve,
The control method of an air conditioner in which the stabilization arrival time of each indoor electronic expansion valve is set per an average time of reaching stabilization of all indoor electronic expansion valves stored in the trial operation step.
The method of claim 4,
The control method of an air conditioner in which the re-operation weight for each indoor electronic expansion valve is limited to a range of 0.5 to 1.5.
The method of claim 1, wherein in the normal operation step,
The control method of an air conditioner, wherein the initial opening degree of the indoor electronic expansion valve is determined by the product of the average opening of each indoor electronic expansion valve and the capacity of each indoor unit stored in the commissioning step and re-operation step per capacity of the total indoor unit.
The method of claim 6, wherein in the normal operation step,
The indoor unit target superheat degree is determined by multiplying the normal operation weight based on 2°C,
The normal operation weight is determined as an average of a stabilization arrival time of each indoor electronic expansion valve in the test operation step and the re-operation step per total indoor stabilization average time.
The method of claim 7, wherein the normal operation weight for each indoor electronic expansion valve is limited to a range of 0.5 to 1.5.

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