CN111609513B - An air conditioner, its control method and computer-readable storage medium - Google Patents

Abstract

The invention discloses an air conditioner, a control method thereof and a computer readable storage medium, wherein the control method comprises the steps of firstly controlling the operation frequency of a compressor according to the condensation temperature to ensure that a high-voltage pressure switch is not disconnected, if the high-voltage pressure switch is disconnected, controlling the frequency of the compressor to continuously reduce until the high-voltage pressure switch is closed, and then controlling the operation frequency of the compressor to rise, wherein the maximum operation frequency of the rising frequency of the compressor does not exceed the limit frequency so as to ensure that the high-voltage pressure switch is not disconnected. Therefore, the invention controls the compressor to continue to operate but reduce the operating frequency by adjusting the operating frequency of the compressor when the high-pressure switch is turned off, and then executes the frequency-raising control when the high-pressure switch is turned off, so as to repeatedly adjust the operating frequency of the compressor, thereby ensuring the continuous operation of the air conditioning system and realizing the continuous refrigeration or heating effect.

Description

An air conditioner, its control method and computer-readable storage medium

technical field

The invention belongs to the technical field of air conditioning, and in particular relates to an air conditioner, a control method thereof, and a computer-readable storage medium.

Background technique

The refrigeration cycle system of the air conditioner is generally equipped with a high-pressure switch. When the pressure at the high-pressure switch is higher than the action value of the high-pressure switch, the high-pressure switch will be disconnected, and the air conditioner will stop running. When the pressure is lower than the operating value of the high pressure switch, the air conditioner restarts. Therefore, when the air conditioner is out of operation, cooling or heat cannot be provided to the room, and the user's demand for air conditioning cannot be met.

The above information disclosed in this background technology is only for enhancement of understanding of the background technology of the application, and therefore, it may include information that does not constitute the prior art that is already known to a person of ordinary skill in the art.

Contents of the invention

The present invention aims at the above-mentioned problems existing in the prior art, and provides an air conditioner and its control method to solve the problem that the air conditioner shuts down because the pressure at the high-pressure switch is higher than the action value of the high-pressure switch, which cannot satisfy the user's requirements for the air conditioner. Technical issues required.

In order to achieve the above-mentioned technical purpose, the present invention adopts the following technical solutions to realize:

A control method for an air conditioner:

Obtain the condensation temperature, and adjust the operating frequency of the compressor to the set frequency when the condensation temperature is greater than the first set condensation temperature;

Obtain the operating frequency of the compressor, and when the operating frequency of the compressor is less than or equal to the set frequency and the high pressure switch is turned off, control the operating frequency of the compressor to decrease until the high pressure switch is closed, and then control the compressor The operating frequency is increased and the maximum operating frequency of the compressor is not more than the limit frequency.

In the air conditioner control method described above, when the operating frequency of the compressor is greater than the set frequency, and when the condensing temperature is greater than the second set condensing temperature, the operating frequency of the compressor is adjusted so that the condensing The temperature is maintained at the second set condensing temperature, and the first set condensing temperature is greater than the second set condensing temperature.

In the control method of the air conditioner described above, during the process of controlling the operating frequency of the compressor to decrease until the high pressure switch is closed, the operating frequency of the compressor is controlled to decrease stepwise.

In the control method of the air conditioner as described above, the reduction range of the operating frequency of the compressors is the same, or the reduction range of the compressor operation frequency in the latter time is smaller than the reduction range of the previous compressor operation frequency.

According to the control method of the air conditioner as described above, the limited frequency is lower than the operating frequency of the compressor when the high pressure switch is turned off.

In the control method of the air conditioner described above, in the process of controlling the operating frequency of the compressor to increase, if the operating frequency of the compressor is increased to the limit frequency, the high pressure switch is not disconnected, and the compressor is controlled to The machine is running at a limited frequency.

In the control method of the air conditioner as described above, in the process of controlling the operating frequency of the compressor to increase, if the high pressure switch is disconnected, the operating frequency of the compressor is controlled to decrease until the high pressure switch is closed, and then The compressor operation frequency is controlled to increase, and the limit frequency in the subsequent compressor operation frequency increase process is lower than the limit frequency in the previous compressor operation frequency increase process.

In the control method of the air conditioner as described above, when the air conditioner is in the heating state, the condensing temperature is the outlet temperature of the indoor heat exchanger; when the air conditioner is in the cooling state, the condensing temperature is the outdoor temperature. The temperature of the heat exchanger.

A computer-readable storage medium stores a computer program used in conjunction with the air conditioner, and the computer program can be executed by a processor to implement the above method.

An air conditioner, comprising:

Condensation temperature detection module, used to detect condensation temperature;

The control module is used to acquire the operating frequency of the compressor, the condensing temperature and the state of the high pressure switch, and control the operating frequency of the compressor according to the above-mentioned control method.

Compared with the prior art, the advantages and positive effects of the present invention are: the control method of the air conditioner of the present invention firstly controls the operating frequency of the compressor according to the condensing temperature to ensure that the high-pressure pressure switch is not disconnected, further, if the high-pressure pressure switch is disconnected When the frequency of the compressor is controlled to continue to decrease until the high pressure switch is closed, then the operating frequency of the compressor is controlled to increase and the maximum operating frequency of the compressor does not exceed the limit frequency to ensure that the high pressure switch does not disconnect. Therefore, the present invention adjusts the operating frequency of the compressor. When the high pressure switch is turned off, the compressor is controlled to continue running but the operating frequency is reduced. Adjust to make the operating frequency of the compressor reach a certain appropriate range, ensure the continuous operation of the air conditioning system, and achieve continuous cooling or heating effects.

Other features and advantages of the present invention will become clearer after reading the detailed description of the present invention in conjunction with the accompanying drawings.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the embodiments. Obviously, the accompanying drawings in the following description are some embodiments of the present invention. For Those of ordinary skill in the art can also obtain other drawings based on these drawings without making creative efforts.

Fig. 1 is a schematic diagram of an air conditioning and refrigeration system according to a specific embodiment of the present invention.

Fig. 2 is a flow chart of the control method of the air conditioner in the heating state according to the specific embodiment of the present invention.

Fig. 3 is a flow chart of the control method of the air conditioner in cooling state according to the specific embodiment of the present invention.

Fig. 4 is a functional block diagram of an air conditioner according to a specific embodiment of the present invention.

Detailed ways

Preferred embodiments of the present invention are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention, and are not intended to limit the protection scope of the present invention.

It should be noted that, in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The terminology of the indicated direction or positional relationship is based on the direction or positional relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation , and therefore cannot be construed as a limitation of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In addition, it should be noted that, in the description of the present invention, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a It is a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediary, and it may be the internal communication of two components. Those skilled in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention.

The control method of the air conditioner in this embodiment first controls the operating frequency of the compressor according to the condensing temperature to ensure that the pressure at the high pressure switch is not higher than the action value of the high pressure switch. Further, if the pressure at the high pressure switch still rises to When the high pressure switch is disconnected, the frequency of the compressor is controlled to continue to decrease until the high pressure switch is closed, and then the operating frequency of the compressor is controlled to increase and the maximum operating frequency of the compressor does not exceed the limit frequency to ensure the pressure at the high pressure switch. Not higher than the action value of the high-pressure pressure switch; when the frequency is increased, if the high-pressure pressure switch operates, the operating frequency of the compressor is controlled to decrease, and the operating frequency of the compressor is repeatedly adjusted to make the operating frequency of the compressor reach a certain value. Appropriate range to ensure the continuous operation of the air conditioning system to achieve continuous cooling or heating effects.

As shown in FIG. 1 , the refrigeration system of the air conditioner in this embodiment includes a compressor, a four-way valve, an indoor heat exchanger, a throttling device, and an outdoor heat exchanger. A high-pressure pressure switch and a low-pressure pressure switch are set in the system. The high-pressure pressure switch has a high-pressure action value, and the low-pressure pressure switch has a low-pressure action value. The high-pressure pressure switch and the low-pressure pressure switch are normally closed switches, and the pressure at the high-pressure pressure switch is greater than the high-pressure action value. , the high pressure switch is disconnected, and when the pressure at the low pressure switch is lower than the low pressure action value, the low pressure switch is disconnected.

In order to ensure the continuous operation of the air conditioner, this embodiment uses the action of the high pressure switch as one of the parameters controlled by the compressor. Specifically, the control method of the air conditioner in this embodiment is as follows:

When the air conditioner is running, the condensing temperature is obtained, and when the condensing temperature is greater than the second set condensing temperature, the operating frequency of the compressor is adjusted to keep the condensing temperature at the second set condensing temperature, so as to ensure that the high pressure switch is not disconnected. Wherein, the second set condensing temperature is the temperature at which the high-pressure pressure switch will not be disconnected, which is determined in advance through experiments. If the condensing temperature continues to rise, when the condensing temperature is greater than the first set condensing temperature, the operating frequency of the compressor is adjusted to decrease to the set frequency. Wherein, the first set condensing temperature is a temperature at which the high-pressure pressure switch will not be disconnected and is close to the operating value of the high-pressure pressure switch determined through experiments in advance, and the first set condensing temperature is greater than the second set condensing temperature.

Obtain the operating frequency of the compressor. When the operating frequency of the compressor is less than or equal to the set frequency and the pressure at the high pressure switch continues to rise until the high pressure switch is disconnected, control the operating frequency of the compressor to decrease until the high pressure switch is closed, and then control The operating frequency of the compressor is increased and the maximum operating frequency of the increased frequency of the compressor does not exceed the limit frequency.

Specifically, in the process of controlling the operating frequency of the compressor to decrease until the high pressure switch is closed, the operating frequency of the compressor is controlled to decrease stepwise.

Wherein, the decreasing range of the operating frequency of the compressors is the same, or the decreasing range of the operating frequency of the compressor in the latter time is smaller than the decreasing range of the operating frequency of the compressor in the previous time, so as to achieve more precise control.

The limiting frequency is less than the running frequency of the compressor when the high pressure switch is turned off.

In the process of controlling the operation frequency of the compressor to increase, if the operation frequency of the compressor is increased to the limit frequency, the high-pressure pressure switch is not disconnected, and the compressor is controlled to run at the limit frequency, so as to ensure that the high-pressure pressure switch is not disconnected. Try to meet the needs of indoor air conditioning.

During the process of controlling the operating frequency of the compressor to increase, if the high pressure switch is disconnected, the operating frequency of the compressor is controlled to decrease until the high pressure switch is closed, and then the operating frequency of the compressor is controlled to increase. The limit frequency in the compressor is lower than the limit frequency during the previous compressor operation frequency increase process, so as to further ensure that the high pressure switch will not be disconnected.

When the air conditioner is running in the heating state, the condensing temperature is the outlet temperature TC2 of the indoor heat exchanger. When the air conditioner includes multiple indoor heat exchangers, the condensing temperature is the average value of the outlet temperatures of all indoor heat exchangers.

Specifically, when the air conditioner is in heating operation, the outlet temperature TC2 of the indoor heat exchanger is obtained, and when the outlet temperature TC2 of the indoor heat exchanger is greater than the second set condensation temperature, the operating frequency of the compressor is adjusted so that the temperature of the indoor heat exchanger The outlet temperature TC2 is kept at the second set condensing temperature to ensure that the high pressure switch is not disconnected. Wherein, the second set condensing temperature is the temperature at which the high-pressure pressure switch will not be disconnected determined through experiments in advance, and the second set condensing temperature is any value in the range of 55°C-58°C. If the outlet temperature TC2 of the indoor heat exchanger continues to rise, when the outlet temperature TC2 of the indoor heat exchanger is greater than the first set condensation temperature, adjust the operating frequency of the compressor to reduce to the set frequency, and the set frequency is 55-65Hz any value in . Among them, the first set condensing temperature is the temperature at which the high-pressure pressure switch will not be disconnected and is close to the action value of the high-pressure pressure switch determined through experiments in advance. The first set condensing temperature is any value between 59°C and 62°C. A set condensing temperature is greater than a second set condensing temperature.

Obtain the operating frequency of the compressor. When the operating frequency of the compressor is less than or equal to the set frequency and the pressure at the high pressure switch continues to rise until the high pressure switch is disconnected, control the operating frequency of the compressor to decrease until the high pressure switch is closed, and then control The operating frequency of the compressor is increased and the maximum operating frequency of the increased frequency of the compressor does not exceed the limit frequency. Limit frequency = operating frequency of the compressor when the high pressure switch is disconnected - the second setting range (10Hz).

Specifically, in the process of controlling the operating frequency of the compressor to decrease until the high pressure switch is closed, the operating frequency of the compressor is controlled to decrease stepwise.

Wherein, the decrease range of the operating frequency of the compressor is the same, for example, the decrease range is 20 Hz, or the decrease range of the compressor operating frequency in the latter time is smaller than the decrease range of the compressor operating frequency in the previous time, so as to achieve more precise control.

The limit frequency is less than the operating frequency of the compressor when the high pressure switch is off.

In the process of controlling the operation frequency of the compressor to increase, if the operation frequency of the compressor is increased to the limit frequency, the high-pressure pressure switch is not disconnected, and the compressor is controlled to run at the limit frequency, so as to ensure that the high-pressure pressure switch is not disconnected. Try to meet the needs of indoor air conditioning.

During the process of controlling the operating frequency of the compressor to increase, if the high pressure switch is disconnected, the operating frequency of the compressor is controlled to decrease until the high pressure switch is closed, and then the operating frequency of the compressor is controlled to increase. The limit frequency in the compressor is lower than the limit frequency during the previous compressor operation frequency increase process, so as to further ensure that the high pressure switch will not be disconnected.

As shown in Figure 2, the method for controlling the heating state of the air conditioner in this embodiment includes the following steps:

S1. The air conditioner is running normally in the heating state.

S2. Detect the outlet temperature TC2 of the indoor heat exchanger.

S3. Judging that TC2>the second set condensation temperature, if yes, go to step S4, otherwise, go to step S2.

S4. Adjust the operating frequency of the compressor to keep the outlet temperature TC2 of the indoor heat exchanger at the second set condensation temperature.

S5. Detect the outlet temperature TC2 of the indoor heat exchanger.

S6. Judging that TC2>the first set condensation temperature, if yes, go to step S7, otherwise, go to step S4.

S7. Adjust the operating frequency of the compressor to decrease to the set frequency.

S8. Obtain the running frequency of the compressor.

S9. Judging that the running frequency of the compressor is less than or equal to the set frequency and the high pressure switch is off, if yes, go to step S10, otherwise, go to step S8.

S10. Obtain the running frequency of the compressor, and control the running frequency of the compressor to reduce the setting range.

S11. Determine whether the high pressure switch is closed, if yes, go to step S12, if not, go to step S10, until the operating frequency of the compressor is reduced to a minimum value and stop.

S12. Control the operating frequency of the compressor to increase to run. The maximum operating frequency during up-frequency operation does not exceed the limit frequency.

S13. Determine whether the high pressure switch is disconnected, if yes, go to step S10, otherwise, go to step S12.

When the air conditioner is running in cooling state, the condensing temperature is the temperature Te of the outdoor heat exchanger.

Specifically, when the air conditioner is in cooling operation, the temperature Te of the outdoor heat exchanger is obtained, and when the temperature Te of the outdoor heat exchanger is greater than the second set condensation temperature, the operating frequency of the compressor is adjusted to keep the temperature Te of the outdoor heat exchanger Set the condensing temperature at the second to ensure that the high pressure pressure switch does not disconnect. Wherein, the second set condensing temperature is a temperature at which the high-pressure pressure switch will not be disconnected determined through experiments in advance, and the second set condensing temperature is any value between 55°C and 58°C. If the temperature Te of the outdoor heat exchanger continues to rise, when the temperature Te of the outdoor heat exchanger is greater than the first set condensation temperature, adjust the operating frequency of the compressor to reduce to the set frequency, and the set frequency is 55-65Hz any value. Among them, the first set condensing temperature is the temperature at which the high-pressure pressure switch will not be disconnected and is close to the action value of the high-pressure pressure switch determined through experiments in advance. The first set condensing temperature is any value between 59°C and 62°C. A set condensing temperature is greater than a second set condensing temperature.

Obtain the operating frequency of the compressor. When the operating frequency of the compressor is less than or equal to the set frequency and the pressure at the high pressure switch continues to rise until the high pressure switch is disconnected, control the operating frequency of the compressor to decrease until the high pressure switch is closed, and then control The operating frequency of the compressor is increased and the maximum operating frequency of the increased frequency of the compressor does not exceed the limit frequency. Limit frequency = operating frequency of the compressor when the high pressure switch is disconnected - the second setting range (10Hz).

Specifically, in the process of controlling the operating frequency of the compressor to decrease until the high pressure switch is closed, the operating frequency of the compressor is controlled to decrease stepwise.

Wherein, the decrease range of the operating frequency of the compressor is the same, for example, the decrease range is 20 Hz, or the decrease range of the compressor operating frequency in the latter time is smaller than the decrease range of the compressor operating frequency in the previous time, so as to achieve more precise control.

The limit frequency is less than the operating frequency of the compressor when the high pressure switch is off.

In the process of controlling the operation frequency of the compressor to increase, if the operation frequency of the compressor is increased to the limit frequency, the high-pressure pressure switch is not disconnected, and the compressor is controlled to run at the limit frequency, so as to ensure that the high-pressure pressure switch is not disconnected. Try to meet the needs of indoor air conditioning.

During the process of controlling the operating frequency of the compressor to increase, if the high pressure switch is disconnected, the operating frequency of the compressor is controlled to decrease until the high pressure switch is closed, and then the operating frequency of the compressor is controlled to increase. The limit frequency in the compressor is lower than the limit frequency during the previous compressor operation frequency increase process, so as to further ensure that the high pressure switch will not be disconnected.

As shown in Figure 3, the method for controlling the refrigeration state of the air conditioner in this embodiment includes the following steps:

S1. The air conditioner is running normally in the cooling state.

S2. Detecting the temperature Te of the outdoor heat exchanger.

S3. Judging that Te>the second set condensation temperature, if yes, go to step S4, otherwise, go to step S2.

S4. Adjust the operating frequency of the compressor to keep the temperature Te of the outdoor heat exchanger at the second set condensing temperature.

S5. Detecting the temperature Te of the outdoor heat exchanger.

S6. Judging that Te>the first set condensation temperature, if yes, go to step S7, otherwise, go to step S4.

S7. Adjust the operating frequency of the compressor to decrease to the set frequency.

S8. Obtain the running frequency of the compressor.

S9. Judging that the running frequency of the compressor is less than or equal to the set frequency and the high pressure switch is off, if yes, go to step S10, otherwise, go to step S8.

S10. Obtain the running frequency of the compressor, and control the running frequency of the compressor to reduce the setting range.

S11. Determine whether the high pressure switch is closed, if yes, go to step S12, if not, go to step S10, until the operating frequency of the compressor is reduced to a minimum value and stop.

S12. Control the operating frequency of the compressor to increase to run. The maximum operating frequency during up-frequency operation does not exceed the limit frequency.

S13. Determine whether the high pressure switch is disconnected, if yes, go to step S10, otherwise, go to step S12.

This embodiment also provides a computer-readable storage medium, which stores a computer program used in combination with the air conditioner, and the computer program can be executed by a processor to implement the above method.

As shown in Figure 4, this embodiment also proposes an air conditioner, including:

Condensation temperature detection module, used to detect condensation temperature;

The control module is used to acquire the operating frequency of the compressor, the condensing temperature and the state of the high pressure switch, and control the operating frequency of the compressor according to the above-mentioned control method.

In this embodiment, by adjusting the operating frequency of the compressor, the operating frequency of the compressor is adjusted repeatedly, so that the operating frequency of the compressor reaches a certain appropriate range, so as to ensure the continuous operation of the air conditioning system and achieve continuous cooling or heating effects.

The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art can still understand the foregoing embodiments. Modifications are made to the technical solutions described, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions claimed in the present invention.

Claims (8)

1. A control method for an air conditioner, characterized in that the method comprises: Obtain the condensing temperature, and adjust the operating frequency of the compressor to the set frequency when the condensing temperature is greater than the first set condensing temperature; Obtain the operating frequency of the compressor, and when the operating frequency of the compressor is less than or equal to the set frequency and the high pressure switch is turned off, control the operating frequency of the compressor to decrease until the high pressure switch is closed, and then control the compressor The operating frequency is increased and the maximum operating frequency of the increased frequency of the compressor does not exceed the limit frequency; The limiting frequency is less than the operating frequency of the compressor when the high pressure switch is turned off; In the process of controlling the operating frequency of the compressor to increase, if the high pressure switch is disconnected, the operating frequency of the compressor is controlled to decrease until the high pressure switch is closed, and then the operating frequency of the compressor is controlled to increase, And the limit frequency in the subsequent compressor operation frequency increase process is lower than the limit frequency in the previous compressor operation frequency increase process. 2. The control method of the air conditioner according to claim 1, characterized in that, when the operating frequency of the compressor is greater than the set frequency, and when the condensing temperature is greater than the second set condensing temperature, adjusting the The operating frequency of the compressor keeps the condensing temperature at the second set condensing temperature, and the first set condensing temperature is greater than the second set condensing temperature. 3 . The control method of the air conditioner according to claim 1 , characterized in that, during the process of controlling the operating frequency of the compressor to decrease until the high pressure switch is closed, the operating frequency of the compressor is controlled to decrease stepwise. 4 . 4. The control method of the air conditioner according to claim 3, characterized in that, the reduction range of the operating frequency of the compressors is the same, or the subsequent reduction in the compressor operating frequency is smaller than the previous reduction in the compressor operating frequency magnitude. 5. The control method of the air conditioner according to claim 1, characterized in that, in the process of controlling the operating frequency of the compressor to increase, if the operating frequency of the compressor is increased to the limit frequency, the high pressure The switch is not turned off, and the compressor is controlled to operate at a limited frequency. 6. The control method of an air conditioner according to any one of claims 1-5, characterized in that, when the air conditioner is in a heating state, the condensing temperature is the outlet temperature of the indoor heat exchanger; the air conditioner When the heat exchanger is in cooling state, the condensation temperature is the temperature of the outdoor heat exchanger. 7. A computer-readable storage medium storing a computer program used in conjunction with the air conditioner, wherein the computer program can be executed by a processor to implement the method according to any one of claims 1-6 . 8. An air conditioner, characterized in that the air conditioner comprises: Condensation temperature detection module, used to detect condensation temperature; The control module is used to obtain the operating frequency of the compressor, the condensing temperature and the state of the high pressure switch, and control the operating frequency of the compressor according to the control method described in any one of claims 1-6.

Images