Refrigeration control method applied to air-conditioning units

Abstract

The present disclosure discloses a refrigeration control method for an air conditioning unit. A specific implementation of this method includes: obtaining the outdoor ambient temperature, indoor unit load ratio, air conditioning unit operating mode information, and initial variable-frequency compressor frequency of the air conditioning unit; obtaining the duration of the variable-frequency compressor operation; determining the preset low-temperature, low-load cooling mode information as the air conditioning unit operating mode information; obtaining the exhaust pressure value; adjusting the speed of the variable-frequency compressor to update the initial variable-frequency compressor frequency and obtain a first variable-frequency compressor output frequency; and adjusting the speed of the outdoor fan. This implementation can increase the service life of the variable-frequency compressor.

Description

Technical Field

[0001] The embodiments of the present disclosure relate to the field of refrigeration control, and more particularly to a refrigeration control method applied to an air-conditioning unit. Background Art

[0002] Air conditioning units feature multiple indoor units, long connecting pipes, and modular outdoor units. Currently, cooling control for air conditioning units typically involves adjusting the output frequency of the outdoor unit's compressor through variable frequency technology to match the indoor load, while also utilizing refrigerant to maintain good cooling efficiency and energy-saving performance even at low ambient temperatures.

[0003] However, when the above method is used for refrigeration control, the following technical problems often occur:

[0004] When the air conditioning unit is cooling at low ambient temperature, the suction temperature will be low and the refrigerant will flow back to the variable frequency compressor, resulting in a reduced service life of the variable frequency compressor.

[0005] The above information disclosed in this Background section is only for enhancement of understanding of the background of the inventive concept and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art. Summary of the Invention

[0006] The content of this disclosure is used to briefly introduce concepts that will be described in detail in the detailed description section below. The content of this disclosure is not intended to identify key features or essential features of the claimed technical solution, nor is it intended to limit the scope of the claimed technical solution.

[0007] Some embodiments of the present disclosure provide a refrigeration control method, device, electronic device, and computer-readable medium for an air-conditioning unit to solve one or more of the technical problems mentioned in the background technology section above.

[0008] In a first aspect, some embodiments of the present disclosure provide a refrigeration control method for an air-conditioning unit, the air-conditioning unit comprising: an outdoor unit and at least one indoor unit, the outdoor unit comprising: a variable frequency compressor, an oil separator, a gas-liquid separator, a four-way valve, an outdoor unit heat exchanger, a heating electronic expansion valve, a plate heat exchanger, a subcooling electronic expansion valve, an exhaust pressure sensor, an intake pressure sensor, an outdoor ambient temperature sensor, and an outdoor fan, the indoor unit of the at least one indoor unit comprising: an indoor unit heat exchanger and a cooling electronic expansion valve, the method comprising: Obtain the outdoor ambient temperature, indoor unit load ratio, air conditioning unit operation mode information, and initial variable frequency compressor frequency of the air conditioning unit, wherein the variable frequency compressor is provided with a variable frequency compressor suction pipe; the variable frequency compressor suction pipe is provided with a suction pressure sensor; the variable frequency compressor is respectively connected to the oil separator and the gas-liquid separator; the oil separator is respectively connected to the gas-liquid separator and the four-way valve; the oil separator is provided with an oil separator exhaust pipe; the oil separator exhaust pipe is provided with an exhaust pressure sensor; the gas-liquid separator is connected to the four-way valve; the four-way valve is respectively connected to the outdoor unit heat exchanger, The indoor unit heat exchanger is connected; an outdoor ambient temperature sensor and an outdoor fan are provided next to the outdoor unit heat exchanger; the outdoor unit heat exchanger is connected to the heating electronic expansion valve; the heating electronic expansion valve is connected to the plate heat exchanger; the plate heat exchanger is respectively connected to the subcooling electronic expansion valve and the cooling electronic expansion valve; the subcooling electronic expansion valve is connected to the cooling electronic expansion valve; the indoor unit heat exchanger is connected to the cooling electronic expansion valve; the duration of the variable frequency compressor is obtained; in response to determining that the outdoor ambient temperature is less than or equal to a first preset temperature, the duration of the variable frequency compressor is greater than or equal to a preset duration, and the indoor unit load ratio is less than the first preset load ratio, the preset low-temperature and low-load cooling mode information is determined as the air conditioning unit operation mode information; in response to determining that the air conditioning unit operation mode information is the preset low-temperature and low-load cooling mode information, an exhaust pressure value is obtained; in response to determining that the exhaust pressure value is less than or equal to the first preset exhaust pressure value, the speed of the variable frequency compressor is adjusted to update the initial variable frequency compressor frequency to obtain a first variable frequency compressor output frequency; and the speed of the outdoor fan is adjusted based on the exhaust pressure value.

[0009] In a second aspect, some embodiments of the present disclosure provide an electronic device comprising: one or more processors; a storage device on which one or more programs are stored, and when the one or more programs are executed by one or more processors, the one or more processors implement the method described in any implementation of the above-mentioned first aspect.

[0010] In a third aspect, some embodiments of the present disclosure provide a computer-readable medium having a computer program stored thereon, wherein when the program is executed by a processor, the method described in any implementation of the first aspect is implemented.

[0011] The above-described embodiments of the present disclosure have the following beneficial effects: The refrigeration control methods applied to air conditioning units according to some embodiments of the present disclosure can increase the service life of a variable-frequency compressor. Specifically, the reason for the reduced service life of the variable-frequency compressor is that, when the air conditioning unit is cooling at low ambient temperatures, the suction temperature is relatively low, causing refrigerant to flow back into the variable-frequency compressor. Based on this, some embodiments of the present disclosure are applied to the refrigeration control method of the air-conditioning unit. First, the outdoor ambient temperature, indoor unit load ratio, air-conditioning unit operation mode information, and initial variable frequency compressor frequency of the air-conditioning unit are obtained, wherein the variable frequency compressor is provided with a variable frequency compressor suction pipe; the variable frequency compressor suction pipe is provided with a suction pressure sensor; the variable frequency compressor is respectively connected to the oil separator and the gas-liquid separator; the oil separator is respectively connected to the gas-liquid separator and the four-way valve; the oil separator is provided with an oil separator exhaust pipe; the oil separator exhaust pipe is provided with an exhaust pressure sensor; the gas-liquid separator is connected to the four-way valve; the four-way valve is respectively connected to the outdoor unit heat exchanger and the indoor unit heat exchanger; an outdoor ambient temperature sensor and an outdoor fan are provided next to the outdoor unit heat exchanger; the outdoor unit heat exchanger is connected to the heating electronic expansion valve; the heating electronic expansion valve is connected to the plate heat exchanger; the plate heat exchanger is respectively connected to the subcooling electronic expansion valve and the cooling electronic expansion valve; the subcooling electronic expansion valve is connected to the cooling electronic expansion valve; the indoor unit heat exchanger is connected to the cooling electronic expansion valve. Thus, obtaining the outdoor ambient temperature and the indoor unit load ratio can help the air conditioner analyze the current cooling demand in real time, obtaining the air conditioner operating mode information can help adjust the operating parameters of the variable frequency compressor, and obtaining the initial variable frequency compressor frequency can determine the operating status of the air conditioner at startup. Secondly, the duration of the variable frequency compressor is obtained. Thus, obtaining the duration of the variable frequency compressor can reveal the working status and operating efficiency of the variable frequency compressor in the air conditioner. Then, in response to determining that the outdoor ambient temperature is less than or equal to a first preset temperature, the duration of the variable frequency compressor is greater than or equal to a preset duration, and the indoor unit load ratio is less than the first preset load ratio, the preset low-temperature, low-load cooling mode information is determined as the air conditioner operating mode information. Thus, by using the preset low-temperature, low-load cooling mode information, the air conditioner can operate at optimal energy efficiency when the ambient temperature is low and the load is light. Then, in response to determining that the air conditioner operating mode information is the preset low-temperature, low-load cooling mode information, the exhaust pressure value is obtained. Then, in response to determining that the exhaust pressure value is less than or equal to the first preset exhaust pressure value, the speed of the variable-frequency compressor is adjusted to update the initial variable-frequency compressor frequency to obtain a first variable-frequency compressor output frequency. This reduces the cooling energy consumption of the air conditioning unit and ensures that the variable-frequency compressor operates at an optimal frequency under different load and environmental conditions. Finally, based on the exhaust pressure value, the speed of the outdoor fan is adjusted. By adjusting the speed of the outdoor fan, the cooling efficiency of the air conditioning unit can be improved and energy consumption can be reduced.Therefore, by adjusting the speed of the variable frequency compressor and the outdoor fan speed, the cooling mode of the air-conditioning unit under low ambient temperature is optimized to increase the suction temperature and suction superheat, thereby reducing the refrigerant backflow and increasing the service life of the variable frequency compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The above and other features, advantages, and aspects of the various embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. Throughout the drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and that components and elements are not necessarily drawn to scale.

[0013] Figure 1 is a flow chart of some embodiments of a refrigeration control method applied to an air-conditioning unit according to the present disclosure;

[0014] Figure 2 is a block diagram of an air conditioning unit module structure suitable for implementing some embodiments of the present disclosure;

[0015] Figure 3 It is a structural diagram of an electronic device suitable for implementing some embodiments of the present disclosure. DETAILED DESCRIPTION

[0016] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments described herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are for illustrative purposes only and are not intended to limit the scope of protection of the present disclosure.

[0017] It should also be noted that, for ease of description, only the parts related to the invention are shown in the drawings. In the absence of conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

[0018] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0019] It should be noted that the modifications of "one" and "multiple" mentioned in the present disclosure are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, they should be understood as "one or more".

[0020] The names of the messages or information exchanged between multiple devices in the embodiments of the present disclosure are only used for illustrative purposes and are not used to limit the scope of these messages or information.

[0021] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0022] Figure 1 This is a flow chart of some embodiments of the refrigeration control method for an air conditioning unit according to the present disclosure. It shows a process 100 of some embodiments of the refrigeration control method for an air conditioning unit according to the present disclosure. The refrigeration control method for an air conditioning unit includes the following steps:

[0023] Step 101: Obtain the outdoor ambient temperature, indoor unit load ratio, air conditioning unit operation mode information, and initial variable frequency compressor frequency of the air conditioning unit.

[0024] In some embodiments, an execution entity of a cooling control method applied to an air conditioning unit may obtain the outdoor ambient temperature, indoor unit load ratio, air conditioning unit operating mode information, and initial variable-frequency compressor frequency of the air conditioning unit via a wired or wireless connection. The outdoor ambient temperature may be the current outdoor ambient temperature value measured by an outdoor ambient temperature sensor. The indoor unit load ratio may be the ratio between the total nominal capacity of the currently active indoor units of the air conditioning unit and the maximum output capacity of the outdoor units. The air conditioning unit operating mode information may represent the operating mode of the air conditioning unit. The initial variable-frequency compressor frequency may be the initial operating frequency of the variable-frequency compressor. The total nominal capacity of the active indoor units may be the sum of the cooling or heating capacity values ​​of the operating indoor units. The maximum output capacity of the outdoor units may be the maximum output capacity value of the outdoor units. The air conditioning unit operating mode information may include preset low-temperature, low-load cooling mode information and preset high-temperature, normal cooling control mode information. For example, the preset low-temperature, low-load cooling mode information may represent, but is not limited to, energy-saving cooling mode or air conditioning dehumidification mode. The preset high-temperature, normal cooling control mode information may represent, but is not limited to, air supply mode or air conditioning automatic mode.

[0025] Here, the air conditioning unit can refer to Figure 2 The structural diagrams of some embodiments of the air conditioning unit are shown, such as Figure 2As shown, the air conditioning unit includes an outdoor unit 15 and at least one indoor unit 16. The outdoor unit 15 comprises a variable frequency compressor 1, an oil separator 2, a gas-liquid separator 3, a four-way valve 4, an outdoor heat exchanger 5, a heating electronic expansion valve 6, a plate heat exchanger 7, a subcooling electronic expansion valve 8, a discharge pressure sensor 11, an intake pressure sensor 12, an outdoor ambient temperature sensor 13, and an outdoor fan 14. The indoor unit in the at least one indoor unit 16 comprises an indoor heat exchanger 9 and a cooling electronic expansion valve 10. Among them, the variable frequency compressor 1 is provided with a variable frequency compressor suction pipe; the variable frequency compressor suction pipe is provided with a suction pressure sensor 12; the variable frequency compressor 1 is respectively connected to the oil separator 2 and the gas-liquid separator 3; the oil separator 2 is respectively connected to the gas-liquid separator 3 and the four-way valve 4; the oil separator 2 is provided with an oil separator exhaust pipe; the oil separator exhaust pipe is provided with an exhaust pressure sensor 11; the gas-liquid separator 3 is connected to the four-way valve 4; the four-way valve 4 is respectively connected to the outdoor unit heat exchanger 5 and the indoor unit heat exchanger 9; an outdoor ambient temperature sensor 13 and an outdoor fan 14 are provided next to the outdoor unit heat exchanger 5; the outdoor unit heat exchanger 5 is connected to the heating electronic expansion valve 6; the heating electronic expansion valve 6 is connected to the plate heat exchanger 7; the plate heat exchanger 7 is respectively connected to the subcooling electronic expansion valve 8 and the cooling electronic expansion valve 10; the subcooling electronic expansion valve 8 is connected to the cooling electronic expansion valve 10; the indoor unit heat exchanger 9 is connected to the cooling electronic expansion valve 10. For example, the variable-frequency compressor 1 can be a permanent magnet variable-frequency compressor or a household split air conditioner variable-frequency compressor. The oil separator 2 can be a centrifugal oil separator, a packing oil separator, or a filter oil separator. The gas-liquid separator 3 can be a centrifugal gas-liquid separator or a wire mesh filter gas-liquid separator. The four-way valve 4 can be a forced-reversing four-way reversing valve or a load-reversing four-way reversing valve. The outdoor unit heat exchanger 5 can be a coil heat exchanger or a shell-and-tube heat exchanger. The heating electronic expansion valve 6 can be a temperature sensor electronic expansion valve or a pressure sensor electronic expansion valve. The plate heat exchanger 7 can be a spiral plate heat exchanger or an air-cooled plate heat exchanger. The subcooling electronic expansion valve 8 can be a conventional electronic expansion valve or a heat exchanger electronic expansion valve. The indoor unit heat exchanger 9 can be a shell-and-tube heat exchanger or a detachable plate heat exchanger. The cooling electronic expansion valve 10 can be a temperature sensor electronic expansion valve or a pressure sensor electronic expansion valve. The exhaust pressure sensor 11 can be a piezoresistive sensor or a piezoelectric sensor. The intake pressure sensor 12 can be a piezoresistive sensor or a piezoelectric sensor. The outdoor ambient temperature sensor 13 can be a semiconductor temperature sensor or an infrared temperature sensor. The outdoor fan 14 can be an axial fan or a centrifugal fan.

[0026] It should be noted that the above-mentioned wireless connection methods may include but are not limited to 3G / 4G connection, WiFi connection, Bluetooth connection, WiMAX connection, Zigbee connection, UWB (ultra wideband) connection, and other wireless connection methods currently known or to be developed in the future.

[0027] Step 102: Obtain the duration of the variable frequency compressor.

[0028] In some embodiments, the execution subject may obtain the duration of the variable frequency compressor through a wired connection or a wireless connection, wherein the duration of the variable frequency compressor may be the duration from when the variable frequency compressor is turned on to when the variable frequency compressor is turned off.

[0029] In practice, the execution entity can obtain the duration of the variable frequency compressor by following the steps below:

[0030] The first step is to obtain the variable frequency compressor temperature at each time granularity within a preset time period to obtain a variable frequency compressor temperature sequence. In some embodiments, the above-mentioned execution entity can obtain the variable frequency compressor temperature at each time granularity within the preset time period through a wired connection or a wireless connection to obtain a variable frequency compressor temperature sequence. The variable frequency compressor temperature in the variable frequency compressor temperature sequence can be: the temperature of the variable frequency compressor measured by the variable frequency compressor temperature sensor. The variable frequency compressor temperature sensor can be: a sensor for measuring the temperature of the variable frequency compressor. For example, the preset time period can be: the time period from two hours before the current moment to the current moment. The time granularity can be: 30 seconds. The variable frequency compressor temperature sensor can be: an indoor pipe temperature sensor, an outdoor pipe temperature sensor.

[0031] In the second step, for each variable frequency compressor temperature in the variable frequency compressor temperature sequence, the execution subject performs the following screening steps:

[0032] The first screening step is to obtain the operating status information of the variable frequency compressor.

[0033] In practice, the execution entity may obtain the variable frequency compressor operating status information via a wired or wireless connection. The variable frequency compressor operating status information may include: first variable frequency compressor operating status information and second variable frequency compressor operating status information. The first variable frequency compressor operating status information may indicate that the variable frequency compressor is in the on state. The second variable frequency compressor operating status information may indicate that the variable frequency compressor is in the off state.

[0034] The second screening step is to obtain a first temperature moment in response to determining that the variable frequency compressor temperature is greater than a first preset variable frequency compressor temperature and the variable frequency compressor operating state information meets a first preset operating condition.

[0035] In practice, in response to determining that the variable frequency compressor temperature is greater than a first preset variable frequency compressor temperature and that the variable frequency compressor operating status information satisfies a first preset operating condition, the execution entity may obtain the first temperature moment via a wired or wireless connection. The first preset operating condition may be that the variable frequency compressor operating status information is first variable frequency compressor operating status information. The first temperature moment may be when the variable frequency compressor is in the on state.

[0036] The third screening step is to obtain a second temperature moment in response to determining that the variable frequency compressor temperature is greater than a second preset variable frequency compressor temperature and the variable frequency compressor operating state information meets a second preset operating condition.

[0037] In practice, in response to determining that the variable frequency compressor temperature is greater than a second preset variable frequency compressor temperature and that the variable frequency compressor operating status information satisfies a second preset operating condition, the execution entity may obtain the second temperature moment via a wired or wireless connection. The second preset operating condition may be that the variable frequency compressor operating status information is the second variable frequency compressor operating status information. The first temperature moment may be when the variable frequency compressor is in the off state.

[0038] The third step is to generate the duration of the variable frequency compressor according to the obtained first temperature moments and second temperature moments.

[0039] In practice, the execution subject may generate the duration of the variable frequency compressor according to each first temperature moment and each second temperature moment obtained by the following steps:

[0040] The first sub-step is to sort the acquired first temperature moments and second temperature moments according to a preset order to generate a target temperature moment sequence. For example, the preset order may be a time order.

[0041] In a second sub-step, in response to determining that the last target temperature moment in the target temperature moment sequence is the first temperature moment, a difference between the current target temperature moment and the last target temperature moment in the target temperature moment sequence is determined as the duration of the variable frequency compressor. The current target temperature moment may be: the current moment.

[0042] In a third sub-step, in response to determining that the last target temperature moment in the target temperature moment sequence is the second temperature moment, the difference between the last target temperature moment and the penultimate target temperature moment in the target temperature moment sequence is determined as the duration of the variable frequency compressor.

[0043] Step 103, in response to determining that the outdoor ambient temperature is less than or equal to the first preset temperature, the duration of the variable frequency compressor is greater than or equal to the preset duration, and the indoor unit load ratio is less than the first preset load ratio, the preset low-temperature and low-load refrigeration mode information is determined as the air-conditioning unit operation mode information.

[0044] In some embodiments, in response to determining that the outdoor ambient temperature is less than or equal to a first preset temperature, the variable frequency compressor operation duration is greater than or equal to a preset duration, and the indoor unit load ratio is less than the first preset load ratio, the execution entity may determine preset low-temperature, low-load cooling mode information as the air conditioning unit operating mode information. For example, the first preset temperature may be 20 degrees Celsius, the preset duration may be 60 seconds, and the first preset load ratio may be 0.15.

[0045] Optionally, in response to determining that the outdoor ambient temperature is greater than a first preset temperature, the preset high-temperature cooling normal control mode information is determined as the air-conditioning unit operation mode information.

[0046] In some embodiments, in response to determining that the outdoor ambient temperature is greater than a first preset temperature, the execution entity may determine preset high-temperature cooling normal control mode information as the air-conditioning unit operation mode information.

[0047] Optionally, in response to determining that the outdoor ambient temperature is less than or equal to a second preset temperature, the duration of the variable frequency compressor is greater than or equal to a preset duration, and the indoor unit load ratio is less than a second preset load ratio, the preset low-temperature and low-load refrigeration mode information is determined as the air-conditioning unit operation mode information.

[0048] In some embodiments, in response to determining that the outdoor ambient temperature is less than or equal to a second preset temperature, the variable frequency compressor duration is greater than or equal to a preset duration, and the indoor unit load ratio is less than the second preset load ratio, the execution entity may determine the preset low-temperature, low-load cooling mode information as the air conditioning unit operating mode information. For example, the second preset temperature may be -5 degrees Celsius, and the second preset load ratio may be 0.5.

[0049] Step 104 : In response to determining that the operating mode information of the air-conditioning unit is the preset low-temperature and low-load cooling mode information, an exhaust pressure value is obtained.

[0050] In some embodiments, in response to determining that the air conditioning unit operating mode information is the preset low-temperature, low-load cooling mode information, the execution entity may obtain the exhaust pressure value through a wired connection or a wireless connection. The exhaust pressure value may be: the current exhaust pressure value measured by the exhaust pressure sensor.

[0051] Step 105 : In response to determining that the exhaust pressure value is less than or equal to the first preset exhaust pressure value, the speed of the variable frequency compressor is adjusted to update the initial variable frequency compressor frequency to obtain a first variable frequency compressor output frequency.

[0052] In some embodiments, in response to determining that the exhaust pressure value is less than or equal to a first preset exhaust pressure value, the execution entity may adjust the speed of the variable frequency compressor to update the initial variable frequency compressor frequency to obtain a first variable frequency compressor output frequency. For example, the first preset exhaust pressure value may be 1.8 megapascals (MPa).

[0053] In practice, in response to determining that the exhaust pressure value is less than or equal to the first preset exhaust pressure value, the execution entity may adjust the speed of the variable frequency compressor through the following steps to update the initial variable frequency compressor frequency and obtain a first variable frequency compressor output frequency:

[0054] The first step is to obtain a suction pressure value in response to determining that the air conditioning unit operating mode information is the preset low-temperature, low-load cooling mode information. In practice, in response to determining that the air conditioning unit operating mode information is the preset low-temperature, low-load cooling mode information, the execution entity may obtain the suction pressure value via a wired or wireless connection. The suction pressure value may be the current suction pressure value measured by the suction pressure sensor.

[0055] In the second step, in response to determining that the load ratio of the indoor unit is less than the first preset load ratio, the speed of the variable frequency compressor is adjusted to update the initial variable frequency compressor frequency to obtain a first variable frequency compressor output frequency.

[0056] In practice, in response to determining that the indoor unit load ratio is less than the first preset load ratio, the above-mentioned execution body can perform the following steps to adjust the speed of the variable frequency compressor to update the initial variable frequency compressor frequency and obtain the first variable frequency compressor output frequency.

[0057] The first sub-step is to obtain an initial variable frequency compressor speed. For example, the initial variable frequency compressor speed may be 0 revolutions per second (rps).

[0058] The second sub-step involves adjusting the initial variable frequency compressor speed to a first preset variable frequency compressor speed. The first preset variable frequency compressor speed may be a ratio of the first variable frequency compressor speed to the first control period. For example, the first variable frequency compressor speed may be within a preset first variable frequency compressor speed range. The preset first variable frequency compressor speed range may be 2 to 4 revolutions per second (rps). The first control period may be within a preset first control period range. The preset first control period range may be 40 to 60 seconds.

[0059] The third sub-step is to determine the first preset variable frequency compressor speed as the updated first variable frequency compressor output frequency.

[0060] In the third step, in response to determining that the indoor unit load ratio is greater than or equal to the first preset load ratio and the indoor unit load ratio is less than the second preset load ratio, the speed of the variable frequency compressor is adjusted to update the initial variable frequency compressor frequency to obtain the first variable frequency compressor output frequency.

[0061] In practice, in response to determining that the indoor unit load ratio is greater than or equal to the first preset load ratio and the indoor unit load ratio is less than the second preset load ratio, the execution entity may perform the following steps to adjust the speed of the variable frequency compressor to update the initial variable frequency compressor frequency and obtain the first variable frequency compressor output frequency:

[0062] The first sub-step is to adjust the initial variable frequency compressor speed to a second preset variable frequency compressor speed. The second preset variable frequency compressor speed may be a ratio of the second variable frequency compressor speed to the first control period. For example, the second variable frequency compressor speed may be within a preset second variable frequency compressor speed range. The preset second variable frequency compressor speed range may be 4 to 8 revolutions per second (rps).

[0063] The second sub-step is to determine the second preset variable frequency compressor speed as the updated first variable frequency compressor output frequency.

[0064] In the fourth step, in response to the exhaust pressure value being greater than the second preset exhaust pressure value and the above-mentioned suction pressure value being less than the second preset suction pressure value, the speed of the variable frequency compressor is adjusted to update the initial variable frequency compressor frequency and obtain the first variable frequency compressor output frequency.

[0065] In practice, in response to the exhaust pressure value being greater than the second preset exhaust pressure value and the suction pressure value being less than the second preset suction pressure value, the execution entity may adjust the speed of the variable frequency compressor through the following steps to update the initial variable frequency compressor frequency and obtain the first variable frequency compressor output frequency:

[0066] In the first sub-step, the initial variable frequency compressor speed is adjusted to the third preset variable frequency compressor speed. The third preset variable frequency compressor speed may be: the ratio of the third variable frequency compressor speed to the second control period. For example, the third variable frequency compressor speed may be within the preset third variable frequency compressor speed range. The preset third variable frequency compressor speed range may be: 4 to 8 revolutions per second (rps). The second control period may be within the preset second control period range. The preset second control period range may be: 60 to 120 seconds. The second preset exhaust pressure value may be: 2.0 MPa. The second preset suction pressure value may be: 1.7 0.7 Megapascal (Mpa)

[0067] The second sub-step is to determine the third preset variable frequency compressor speed as the updated first variable frequency compressor output frequency.

[0068] Optionally, in response to determining that the exhaust pressure value is greater than the first preset exhaust pressure value, the initial variable frequency compressor frequency is determined as the second variable frequency compressor output frequency.

[0069] In some embodiments, in response to determining that the exhaust pressure value is greater than the first preset exhaust pressure value, the execution entity may determine the initial variable frequency compressor frequency as the second variable frequency compressor output frequency.

[0070] Step 106: Based on the exhaust pressure value, adjust the speed of the outdoor fan.

[0071] In practice, based on the exhaust pressure value, the execution entity may adjust the speed of the outdoor fan through the following steps:

[0072] The first step is to perform a first outdoor fan speed adjustment process on the outdoor fan in response to determining that the exhaust pressure value is greater than or equal to the first preset outdoor fan exhaust pressure value, and the exhaust pressure value is less than or equal to the second preset outdoor fan exhaust pressure value. In practice, in response to determining that the exhaust pressure value is greater than the third preset outdoor fan exhaust pressure value, and the exhaust pressure value is less than or equal to the second preset outdoor fan exhaust pressure value, the execution entity may adjust the outdoor fan speed to the first outdoor fan speed. The outdoor fan speed may be: the current outdoor fan speed. For example, the first preset outdoor fan exhaust pressure value may be: 2.6 megapascals (Mpa). The second preset outdoor fan exhaust pressure value may be: 3.0 megapascals (Mpa). The first outdoor fan speed may be: 0 revolutions per minute (rpm).

[0073] In the second step, in response to determining that the exhaust pressure value is greater than the second preset outdoor fan exhaust pressure value, and the exhaust pressure value is less than or equal to the third preset outdoor fan exhaust pressure value, the outdoor fan is subjected to a second outdoor fan speed adjustment process. In practice, in response to determining that the exhaust pressure value is greater than the second preset outdoor fan exhaust pressure value, and the exhaust pressure value is less than or equal to the third preset outdoor fan exhaust pressure value, the execution entity may adjust the outdoor fan speed to the second outdoor fan speed. For example, the third preset outdoor fan exhaust pressure value may be: 3.3 megapascals (MPa). The second outdoor fan speed may be: 210 revolutions per minute (rpm).

[0074] In a third step, in response to determining that the exhaust pressure value is greater than a third preset outdoor fan exhaust pressure value, the outdoor fan speed is adjusted to a third outdoor fan speed. In practice, in response to determining that the exhaust pressure value is greater than the third preset outdoor fan exhaust pressure value, the execution entity may adjust the outdoor fan speed to a third outdoor fan speed. For example, the third outdoor fan speed may be 270 revolutions per minute (rpm).

[0075] The above-described embodiments of the present disclosure have the following beneficial effects: The refrigeration control methods applied to air conditioning units according to some embodiments of the present disclosure can increase the service life of a variable-frequency compressor. Specifically, the reason for the reduced service life of the variable-frequency compressor is that, when the air conditioning unit is cooling at low ambient temperatures, the suction temperature is relatively low, causing refrigerant to flow back into the variable-frequency compressor. Based on this, some embodiments of the present disclosure are applied to the refrigeration control method of the air-conditioning unit. First, the outdoor ambient temperature, indoor unit load ratio, air-conditioning unit operation mode information, and initial variable frequency compressor frequency of the air-conditioning unit are obtained, wherein the variable frequency compressor is provided with a variable frequency compressor suction pipe; the variable frequency compressor suction pipe is provided with a suction pressure sensor; the variable frequency compressor is respectively connected to the oil separator and the gas-liquid separator; the oil separator is respectively connected to the gas-liquid separator and the four-way valve; the oil separator is provided with an oil separator exhaust pipe; the oil separator exhaust pipe is provided with an exhaust pressure sensor; the gas-liquid separator is connected to the four-way valve; the four-way valve is respectively connected to the outdoor unit heat exchanger and the indoor unit heat exchanger; an outdoor ambient temperature sensor and an outdoor fan are provided next to the outdoor unit heat exchanger; the outdoor unit heat exchanger is connected to the heating electronic expansion valve; the heating electronic expansion valve is connected to the plate heat exchanger; the plate heat exchanger is respectively connected to the subcooling electronic expansion valve and the cooling electronic expansion valve; the subcooling electronic expansion valve is connected to the cooling electronic expansion valve; the indoor unit heat exchanger is connected to the cooling electronic expansion valve. Thus, obtaining the outdoor ambient temperature and the indoor unit load ratio can help the air conditioner analyze the current cooling demand in real time, obtaining the air conditioner operating mode information can help adjust the operating parameters of the variable frequency compressor, and obtaining the initial variable frequency compressor frequency can determine the operating status of the air conditioner at startup. Secondly, the duration of the variable frequency compressor is obtained. Thus, obtaining the duration of the variable frequency compressor can reveal the working status and operating efficiency of the variable frequency compressor in the air conditioner. Then, in response to determining that the outdoor ambient temperature is less than or equal to a first preset temperature, the duration of the variable frequency compressor is greater than or equal to a preset duration, and the indoor unit load ratio is less than the first preset load ratio, the preset low-temperature, low-load cooling mode information is determined as the air conditioner operating mode information. Thus, by using the preset low-temperature, low-load cooling mode information, the air conditioner can operate at optimal energy efficiency when the ambient temperature is low and the load is light. Then, in response to determining that the air conditioner operating mode information is the preset low-temperature, low-load cooling mode information, the exhaust pressure value is obtained. Then, in response to determining that the exhaust pressure value is less than or equal to the first preset exhaust pressure value, the speed of the variable-frequency compressor is adjusted to update the initial variable-frequency compressor frequency to obtain a first variable-frequency compressor output frequency. This reduces the cooling energy consumption of the air conditioning unit and ensures that the variable-frequency compressor operates at an optimal frequency under different load and environmental conditions. Finally, based on the exhaust pressure value, the speed of the outdoor fan is adjusted. By adjusting the speed of the outdoor fan, the cooling efficiency of the air conditioning unit can be improved and energy consumption can be reduced.Therefore, by adjusting the speed of the variable frequency compressor and the outdoor fan speed, the cooling mode of the air-conditioning unit under low ambient temperature is optimized to increase the suction temperature and suction superheat, thereby reducing the refrigerant backflow and increasing the service life of the variable frequency compressor.

[0076] Reference below Figure 3 , which shows a schematic diagram of the structure of an electronic device 300 (e.g., a computing device) suitable for implementing some embodiments of the present disclosure. The electronic devices in some embodiments of the present disclosure may include, but are not limited to, mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (personal digital assistants), PADs (tablet computers), PMPs (portable multimedia players), etc., as well as fixed terminals such as digital TVs and desktop computers. Figure 3 The electronic device shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present disclosure.

[0077] like Figure 3 As shown, the electronic device 300 may include a processing device (e.g., a central processing unit, a graphics processing unit, etc.) 301, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 302 or a program loaded from a storage device 308 into a random access memory (RAM) 303. Various programs and data required for the operation of the electronic device 300 are also stored in the RAM 303. The processing device 301, the ROM 302, and the RAM 303 are connected to each other via a bus 304. An input / output (I / O) interface 305 is also connected to the bus 304.

[0078] Typically, the following devices may be connected to the I / O interface 305: an input device 306 including, for example, a touch screen, a touchpad, a keyboard, a mouse, a camera, a microphone, an accelerometer, a gyroscope, etc.; an output device 307 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; a storage device 308 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 309. The communication device 309 may allow the electronic device 300 to communicate with other devices wirelessly or by wire to exchange data. Figure 3 The electronic device 300 is shown with various devices, but it should be understood that it is not required to implement or possess all of the devices shown. More or fewer devices may be implemented or possessed instead. Figure 3 Each block shown in the figure may represent one device, or may represent multiple devices as needed.

[0079] In particular, according to some embodiments of the present disclosure, the process described above with reference to the flowchart can be implemented as a computer software program. For example, some embodiments of the present disclosure include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes program code for executing the method shown in the flowchart. In some such embodiments, the computer program can be downloaded and installed from the network via the communication device 309, or installed from the storage device 308, or installed from the ROM 302. When the computer program is executed by the processing device 301, the above-mentioned functions defined in the method of some embodiments of the present disclosure are performed.

[0080] It should be noted that the computer-readable medium described in some embodiments of the present disclosure may be a computer-readable signal medium or a computer-readable storage medium, or any combination of the two. The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or device, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In some embodiments of the present disclosure, the computer-readable storage medium may be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, device, or device. In some embodiments of the present disclosure, the computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, which carries computer-readable program code. Such a propagated data signal may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium that can transmit, propagate, or transport a program for use by or in conjunction with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium may be transmitted using any suitable medium, including but not limited to wires, optical cables, RF (radio frequency), etc., or any suitable combination thereof.

[0081] In some embodiments, the client and server can communicate using any currently known or future developed network protocol, such as HTTP (HyperText Transfer Protocol), and can be interconnected with any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include a local area network ("LAN"), a wide area network ("WAN"), an internet (e.g., the Internet), and a peer-to-peer network (e.g., an ad hoc peer-to-peer network), as well as any currently known or future developed network.

[0082] The above-mentioned computer-readable medium may be included in the above-mentioned electronic device; or it may exist independently without being assembled into the electronic device. The above-mentioned computer-readable medium carries one or more programs. When the above-mentioned one or more programs are executed by the electronic device, the electronic device: obtains the outdoor ambient temperature, indoor unit load ratio, air conditioning unit operation mode information, and initial variable frequency compressor frequency of the air-conditioning unit, wherein the variable frequency compressor is provided with a variable frequency compressor suction pipe; the variable frequency compressor suction pipe is provided with a suction pressure sensor; the variable frequency compressor is respectively connected to the oil separator and the gas-liquid separator; the oil separator is respectively connected to the gas-liquid separator and the four-way valve; the oil separator is provided with an oil separator exhaust pipe; the oil separator exhaust pipe is provided with an exhaust pressure sensor; the gas-liquid separator is connected to the four-way valve; the four-way valve is respectively connected to the outdoor unit heat exchanger and the indoor unit heat exchanger; an outdoor ambient temperature sensor and an outdoor fan are provided next to the outdoor unit heat exchanger; the outdoor unit heat exchanger is connected to the heating electronic expansion valve; the heating electronic expansion valve is connected to the plate heat exchanger ; The plate heat exchanger is respectively connected to the supercooling electronic expansion valve and the refrigeration electronic expansion valve; the supercooling electronic expansion valve is connected to the refrigeration electronic expansion valve; the indoor unit heat exchanger is connected to the refrigeration electronic expansion valve; the duration of the variable frequency compressor is obtained; in response to determining that the above-mentioned outdoor ambient temperature is less than or equal to the first preset temperature, the duration of the above-mentioned variable frequency compressor is greater than or equal to the preset duration, and the above-mentioned indoor unit load ratio is less than the first preset load ratio, the preset low-temperature and low-load refrigeration mode information is determined as the air-conditioning unit operation mode information; in response to determining that the air-conditioning unit operation mode information is the preset low-temperature and low-load refrigeration mode information, the exhaust pressure value is obtained; in response to determining that the above-mentioned exhaust pressure value is less than or equal to the first preset exhaust pressure value, the speed of the above-mentioned variable frequency compressor is adjusted to update the above-mentioned initial variable frequency compressor frequency and obtain the first variable frequency compressor output frequency; based on the above-mentioned exhaust pressure value, the speed of the above-mentioned outdoor fan is adjusted.

[0083] Computer program code for performing the operations of some embodiments of the present disclosure may be written in one or more programming languages, or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., through the Internet using an Internet service provider).

[0084] The flowcharts and block diagrams in the accompanying drawings illustrate the possible implementation architecture, functions and operations of the systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each box in the flowchart or block diagram can represent a module, program segment, or a part of code, and the module, program segment, or a part of code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order than that marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of the boxes in the block diagram and / or flowchart, can be implemented with a dedicated hardware-based system that performs the specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0085] The functions described above herein may be performed, at least in part, by one or more hardware logic components. For example, and without limitation, exemplary types of hardware logic components that may be used include: field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chip (SOCs), complex programmable logic devices (CPLDs), and the like.

[0086] The above description is only an illustration of some preferred embodiments of the present disclosure and the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the embodiments of the present disclosure is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the above-mentioned inventive concept. For example, the above-mentioned features are replaced with (but not limited to) technical features with similar functions disclosed in the embodiments of the present disclosure.

Claims

1. A refrigeration control method for an air conditioning unit, the air conditioning unit comprising: An outdoor unit and at least one indoor unit, wherein the outdoor unit comprises: a variable frequency compressor, an oil separator, a gas-liquid separator, a four-way valve, an outdoor unit heat exchanger, a heating electronic expansion valve, a plate heat exchanger, a subcooling electronic expansion valve, an exhaust pressure sensor, an intake pressure sensor, an outdoor ambient temperature sensor, and an outdoor fan; wherein the indoor unit in the at least one indoor unit comprises: an indoor unit heat exchanger and a cooling electronic expansion valve; and the method comprises: Obtain the outdoor ambient temperature, indoor unit load ratio, air conditioning unit operation mode information, and initial variable frequency compressor frequency of the air conditioning unit, wherein the variable frequency compressor is provided with a variable frequency compressor suction pipe; the variable frequency compressor suction pipe is provided with a suction pressure sensor; the variable frequency compressor is connected to the oil separator and the gas-liquid separator respectively; the oil separator is connected to the gas-liquid separator and the four-way valve respectively; the oil separator is provided with an oil separator exhaust pipe; the oil separator exhaust pipe is provided with an exhaust pressure sensor; the gas-liquid separator is connected to the four-way valve; the four-way valve is respectively connected to the outdoor unit heat exchanger and the indoor unit heat exchanger; an outdoor ambient temperature sensor and an outdoor fan are provided next to the outdoor unit heat exchanger; the outdoor unit heat exchanger is connected to the heating electronic expansion valve; the heating electronic expansion valve is connected to the plate heat exchanger; the plate heat exchanger is respectively connected to the subcooling electronic expansion valve and the cooling electronic expansion valve; the subcooling electronic expansion valve is connected to the cooling electronic expansion valve; the indoor unit heat exchanger is connected to the cooling electronic expansion valve; Get the duration of the inverter compressor, including: Obtaining the variable frequency compressor temperature at each time granularity within a preset time period to obtain a variable frequency compressor temperature sequence; For each variable frequency compressor temperature in the variable frequency compressor temperature sequence, the following screening steps are performed: Get the operating status information of the variable frequency compressor; In response to determining that the variable frequency compressor temperature is greater than a first preset variable frequency compressor temperature and the variable frequency compressor operating state information satisfies a first preset operating condition, obtaining a first temperature moment; In response to determining that the variable frequency compressor temperature is greater than a second preset variable frequency compressor temperature and the variable frequency compressor operating state information satisfies a second preset operating condition, acquiring a second temperature moment; Generate a duration of the variable frequency compressor according to each first temperature moment and each second temperature moment obtained; In response to determining that the outdoor ambient temperature is less than or equal to a first preset temperature, the duration of the variable frequency compressor is greater than or equal to a preset duration, and the indoor unit load ratio is less than the first preset load ratio, determining the preset low-temperature and low-load cooling mode information as the air conditioning unit operation mode information; In response to determining that the operating mode information of the air-conditioning unit is the preset low-temperature and low-load cooling mode information, obtaining the exhaust pressure value; In response to determining that the exhaust pressure value is less than or equal to a first preset exhaust pressure value, adjusting the speed of the variable frequency compressor to update the initial variable frequency compressor frequency to obtain a first variable frequency compressor output frequency; Based on the exhaust pressure value, the speed of the outdoor fan is adjusted.

2. The refrigeration control method for an air-conditioning unit according to claim 1, wherein: The method further comprises: In response to determining that the outdoor ambient temperature is greater than a first preset temperature, determining preset high-temperature cooling normal control mode information as the air-conditioning unit operation mode information; In response to determining that the outdoor ambient temperature is less than or equal to a second preset temperature, the duration of the variable frequency compressor is greater than or equal to a preset duration, and the indoor unit load ratio is less than a second preset load ratio, the preset low-temperature and low-load refrigeration mode information is determined as the air-conditioning unit operation mode information.

3. The refrigeration control method for an air-conditioning unit according to claim 1, wherein: The method further comprises: In response to determining that the exhaust pressure value is greater than the first preset exhaust pressure value, the initial variable frequency compressor frequency is determined as the second variable frequency compressor output frequency.

4. The refrigeration control method for an air-conditioning unit according to claim 2, wherein: The step of adjusting the speed of the variable frequency compressor to update the initial variable frequency compressor frequency and obtain a first variable frequency compressor output frequency includes: In response to determining that the operating mode information of the air conditioning unit is the preset low-temperature and small-load refrigeration mode information, obtaining a suction pressure value; In response to determining that the load ratio of the indoor unit is less than the first preset load ratio, adjusting the speed of the variable frequency compressor to update the initial variable frequency compressor frequency to obtain a first variable frequency compressor output frequency; In response to determining that the load ratio of the indoor unit is greater than or equal to the first preset load ratio and the load ratio of the indoor unit is less than the second preset load ratio, adjusting the speed of the variable frequency compressor to update the initial variable frequency compressor frequency to obtain a first variable frequency compressor output frequency; In response to the exhaust pressure value being greater than the second preset exhaust pressure value and the suction pressure value being less than the second preset suction pressure value, the speed of the variable frequency compressor is adjusted to update the initial variable frequency compressor frequency to obtain a first variable frequency compressor output frequency.

5. The refrigeration control method for an air-conditioning unit according to claim 1, wherein: The speed adjustment process for the outdoor fan includes: In response to determining that the exhaust pressure value is greater than or equal to a first preset outdoor fan exhaust pressure value, and the exhaust pressure value is less than or equal to a second preset outdoor fan exhaust pressure value, performing a first outdoor fan speed adjustment process on the outdoor fan; In response to determining that the exhaust pressure value is greater than a second preset outdoor fan exhaust pressure value, and the exhaust pressure value is less than or equal to a third preset outdoor fan exhaust pressure value, performing a second outdoor fan speed adjustment process on the outdoor fan; In response to determining that the exhaust pressure value is greater than a third preset outdoor fan exhaust pressure value, a third outdoor fan speed adjustment process is performed on the outdoor fan.

6. An electronic device comprising: one or more processors; a storage device having one or more programs stored thereon; When the one or more programs are executed by the one or more processors, the one or more processors implement the method according to any one of claims 1 to 5.

7. A computer-readable medium having a computer program stored thereon, wherein: When the program is executed by a processor, the method according to any one of claims 1 to 5 is implemented.

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