CN113339943B - Air conditioner control method, air conditioner control device, air conditioner system and computer readable storage medium - Google Patents
Air conditioner control method, air conditioner control device, air conditioner system and computer readable storage medium Download PDFInfo
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- CN113339943B CN113339943B CN202110504193.4A CN202110504193A CN113339943B CN 113339943 B CN113339943 B CN 113339943B CN 202110504193 A CN202110504193 A CN 202110504193A CN 113339943 B CN113339943 B CN 113339943B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/54—Control or safety arrangements characterised by user interfaces or communication using one central controller connected to several sub-controllers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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Abstract
The application provides an air conditioner control method, an air conditioner control device, an air conditioner system and a computer readable storage medium, wherein the method comprises the following steps: when the air conditioner working mode is detected to be a heating mode, acquiring a low-pressure saturation temperature, a high-pressure saturation temperature and an air conditioner exhaust temperature; if the low-pressure saturation temperature is smaller than or equal to a preset temperature threshold value, acquiring an exhaust superheat degree according to the high-pressure saturation temperature and the air conditioner exhaust temperature; and if the exhaust superheat degree is smaller than a preset superheat degree threshold value, controlling an air conditioner compressor to operate according to the current frequency until the exhaust superheat degree is detected to be larger than or equal to the superheat degree threshold value. By adopting the method, the contradiction problems of too low pressure and too small exhaust superheat degree existing in the initial heating starting stage of the air conditioner can be solved, and finally the operation reliability of the air conditioner is improved.
Description
Technical Field
The application relates to the technical field of air conditioners, in particular to an air conditioner control method and device, an air conditioner system and a computer readable storage medium.
Background
With the rapid development of air conditioning technology, air conditioners become essential common electric appliances in modern life, but the problems of overhigh high voltage, overlow low voltage, overhigh exhaust temperature and the like inevitably occur in the air conditioners in daily operation, and the reliability of the air conditioner operation is seriously influenced by the problems. For example, in the initial stage of starting low-temperature heating, the low pressure is relatively low, the operating frequency of the compressor needs to be reduced to avoid the low pressure from being too low, and once the operating frequency of the compressor is reduced, the superheat degree of the compressor discharge air, which rises slowly in the initial stage of starting, cannot be increased quickly, and the superheat degree of the compressor discharge air is too low.
The existing air conditioner control method for solving the problem of over-low exhaust superheat degree of an air conditioner at the initial starting stage cannot be solved because the exhaust superheat degree of a compressor is improved mainly by reducing the opening degree of an electronic expansion valve, but when the actual running frequency of the compressor is low, the exhaust superheat degree is difficult to improve even if the opening degree of the electronic expansion valve is reduced.
Therefore, the existing air conditioner control method has the technical problem of low operation reliability of the air conditioner due to unreasonable control mode.
Disclosure of Invention
Therefore, it is necessary to provide an air conditioner control method, an air conditioner control device, an air conditioner system, and a computer-readable storage medium for analyzing the low pressure of the air conditioner and the exhaust superheat of the compressor to adjust the operation frequency of the compressor when the air conditioner starts heating, so as to avoid the situation that the exhaust superheat cannot be rapidly increased to cause the exhaust superheat to be too small when the problem of too low pressure is solved, thereby improving the reliability of the operation of the air conditioner.
In a first aspect, the present application provides an air conditioner control method, including:
when the working mode of the air conditioner is detected to be a heating mode, acquiring a low-pressure saturation temperature, a high-pressure saturation temperature and an air conditioner exhaust temperature;
if the low-pressure saturation temperature is smaller than or equal to a preset temperature threshold value, acquiring an exhaust superheat degree according to the high-pressure saturation temperature and the air conditioner exhaust temperature;
and if the exhaust superheat degree is smaller than a preset superheat degree threshold value, controlling the air conditioner compressor to operate according to the current frequency until the exhaust superheat degree is larger than or equal to the superheat degree threshold value.
In some embodiments of the present application, after the step of obtaining the superheat degree of exhaust air according to the high-pressure saturation temperature and the exhaust air temperature of the air conditioner if the low-pressure saturation temperature is less than or equal to a preset temperature threshold, the method further includes:
if the exhaust superheat degree is larger than or equal to the superheat degree threshold value, acquiring a target frequency, wherein the target frequency is smaller than the current frequency;
and controlling the air conditioner compressor to run according to the target frequency until the air conditioner working mode is detected to be a refrigerating mode or the exhaust superheat degree is smaller than the superheat degree threshold value.
In some embodiments of the present application, after the step of obtaining the low-pressure saturation temperature, the high-pressure saturation temperature, and the air-conditioning exhaust temperature when it is detected that the air-conditioning operation mode is the heating mode, the method further includes:
if the low-pressure saturation temperature is larger than the temperature threshold, acquiring a target frequency, wherein the target frequency is smaller than the current frequency;
and controlling the air conditioner compressor to run according to the target frequency until the air conditioner working mode is detected to be a refrigeration mode or the exhaust superheat degree is smaller than the superheat degree threshold value.
In some embodiments of the present application, when it is detected that the air conditioner operating mode is the heating mode, the step of obtaining the low-pressure saturation temperature, the high-pressure saturation temperature, and the air conditioner exhaust temperature includes:
detecting an air-conditioning working mode of air-conditioning equipment;
when the working mode of the air conditioner is detected to be a heating mode, acquiring low pressure of the air conditioner, high pressure of the air conditioner and exhaust temperature of the air conditioner;
and acquiring low-pressure saturation temperature according to the low-pressure of the air conditioner, and acquiring high-pressure saturation temperature according to the high-pressure of the air conditioner.
In some embodiments of the present application, the step of obtaining a low pressure saturation temperature according to the low pressure of the air conditioner and obtaining a high pressure saturation temperature according to the high pressure of the air conditioner includes:
acquiring a first saturation temperature corresponding to the low pressure of the air conditioner and a second saturation temperature corresponding to the high pressure of the air conditioner based on a preset pressure-temperature comparison table;
determining the first saturation temperature as the low pressure saturation temperature and determining the second saturation temperature as the high pressure saturation temperature.
In some embodiments of the present application, if the low-pressure saturation temperature is less than or equal to a preset temperature threshold, the step of obtaining the superheat degree of the exhaust gas according to the high-pressure saturation temperature and the exhaust temperature of the air conditioner includes:
if the low-pressure saturation temperature is smaller than or equal to a preset temperature threshold value, calculating a temperature difference value between the air conditioner exhaust temperature and the high-pressure saturation temperature;
and determining the temperature difference as the exhaust superheat degree.
In a second aspect, the present application provides an air conditioning control apparatus, the apparatus comprising:
the mode detection module is used for acquiring a low-pressure saturation temperature, a high-pressure saturation temperature and an air conditioner exhaust temperature when the air conditioner working mode is detected to be a heating mode;
the data analysis module is used for acquiring the exhaust superheat degree according to the high-pressure saturation temperature and the air conditioner exhaust temperature when the low-pressure saturation temperature is detected to be smaller than or equal to a preset temperature threshold value;
and the air conditioner control module is used for controlling the air conditioner compressor to operate according to the current frequency when the exhaust superheat degree is detected to be smaller than a preset superheat degree threshold value until the exhaust superheat degree is larger than or equal to the superheat degree threshold value.
In a third aspect, the present application further provides an air conditioning system comprising: an air conditioning apparatus, and a controller for controlling the air conditioning apparatus; the controller is in communication connection with the air conditioning equipment; the air conditioning equipment comprises a high-pressure sensor, a low-pressure sensor, a top-pressing temperature sensor and an air conditioning compressor, wherein the controller controls the air conditioning equipment according to the method of the embodiment.
In some embodiments of the present application, the air conditioning apparatus further comprises an oil separator, a four-way valve, and a gas-liquid separator, wherein the high pressure sensor is disposed between an outlet pipe of the oil separator and a high pressure inlet pipe of the four-way valve, and is configured to collect an air conditioning high pressure to obtain the high pressure saturation temperature;
the low-pressure sensor is arranged between an inlet pipe of the gas-liquid separator and a low-pressure outlet pipe of the four-way valve and is used for collecting the low-pressure of the air conditioner so as to obtain the low-pressure saturation temperature;
and the top pressing temperature sensor is arranged at the top of the air conditioner compressor and used for collecting the air conditioner exhaust temperature.
In a fourth aspect, the present application also provides a computer-readable storage medium, on which a computer program is stored, the computer program being loaded by a processor to perform the steps in the air conditioner control method as described above.
In a fifth aspect, embodiments of the present application provide a computer program product or computer program comprising computer instructions stored in a computer readable storage medium. The processor of the computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions to cause the computer device to perform the method provided by the first aspect.
According to the air conditioner control method, the air conditioner control device, the air conditioner system and the computer readable storage medium, when the working mode of the air conditioner is detected to be the heating mode, the indoor unit obtains the low-pressure saturation temperature, the high-pressure saturation temperature and the air conditioner exhaust temperature, so that when the low-pressure saturation temperature is detected to be smaller than or equal to the preset temperature threshold, the exhaust superheat degree is obtained according to the high-pressure saturation temperature and the air conditioner exhaust temperature, when the exhaust superheat degree is smaller than the preset superheat degree threshold, the air conditioner compressor is controlled to operate according to the current frequency until the exhaust superheat degree is larger than or equal to the superheat degree threshold, the problem that when the problem of low-pressure over-low is solved in a frequency reduction mode, the exhaust superheat degree of the compressor is slowly increased to be too small is avoided, the phenomenon that the exhaust superheat degree is insufficient is avoided, the shutdown is protected, the service life of the compressor is prolonged, and the reliability of the operation of the air conditioner is finally improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of an air conditioning system according to an embodiment of the present application;
FIG. 2 is a flow chart of an air conditioner control method according to an embodiment of the present application;
FIG. 3 is a schematic flow chart of an air conditioner control method in an embodiment of the present application;
FIG. 4 is a schematic structural diagram of an air conditioning control device in an embodiment of the present application;
fig. 5 is a schematic structural diagram of a computer device in an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In the description of the present application, the term "for example" is used to mean "serving as an example, instance, or illustration". Any embodiment described herein as "for example" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the invention. In the following description, details are set forth for the purpose of explanation. It will be apparent to one of ordinary skill in the art that the present invention may be practiced without these specific details. In other instances, well-known structures and processes are not shown in detail to avoid obscuring the description of the invention with unnecessary detail. Thus, the present invention is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.
Embodiments of the present application provide an air conditioner control method, an air conditioner control device, an air conditioner system, and a computer-readable storage medium, which are described in detail below.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an air conditioning system provided in the present application, where the air conditioning system may include an air conditioning device and a controller for controlling the air conditioning device. The air conditioning equipment can comprise an air conditioning compressor, a top pressure temperature sensor, a high-pressure sensor, an oil separator, a four-way valve, an outdoor heat exchanger, an outdoor fan, a heat exchanger middle temperature sensing bulb, a throttling device, a gas-liquid separator, a low-pressure sensor, a high-pressure stop valve, a low-pressure stop valve and an oil return capillary tube. The controller that controls the air conditioner may be a controller provided in an indoor unit. In addition, high pressure sensor sets up between the high-pressure import pipe of oil separator's outlet pipe and cross valve, and low pressure sensor sets up between the inlet tube of vapour and liquid separator and the low pressure outlet pipe of cross valve, and the setting of top pressure temperature sensor is at air condition compressor's casing top, and the position and the connected mode of setting up of other modules or subassembly are shown in FIG. 1, and this application is no longer repeated herein.
It should be understood by those skilled in the art that the schematic structural diagram of the air conditioning system shown in fig. 1 is only an example, the air conditioning system and the structure described in the embodiment of the present invention are for more clearly illustrating the technical solutions of the embodiment of the present invention, and do not constitute a limitation to the technical solutions provided in the embodiment of the present invention, and it is known by those skilled in the art that the technical solutions provided in the embodiment of the present invention are also applicable to similar technical problems with the evolution of the air conditioning system and the emergence of new structures.
Referring to fig. 2, an embodiment of the present application provides an air conditioner control method, which is mainly illustrated below by applying the method to an indoor unit in fig. 1, and the method includes steps S201 to S203, which are specifically as follows:
s201, when the air conditioner working mode is detected to be the heating mode, acquiring a low-pressure saturation temperature, a high-pressure saturation temperature and an air conditioner exhaust temperature.
The air conditioner working mode may refer to a functional mode that the air conditioner can run and implement, and includes but is not limited to ventilation, defrosting, heating, cooling, automatic, dehumidifying, sleeping and other modes.
The saturation temperature may be a temperature corresponding to a gas-liquid two-phase saturated state at a given pressure, and the high-pressure saturation temperature "Tps" or the low-pressure saturation temperature "Tls" is determined by the pressure, and the higher the pressure, the higher the saturation temperature, and the lower the saturation temperature, or vice versa, the unit is "c".
Wherein, the air conditioner exhaust temperature can refer to the top temperature of the air conditioner compressor, and is expressed as Tp, and the unit is DEG C.
Specifically, the air conditioning system applied in the embodiment of the present application may be a multi-split air conditioning system, which is characterized by one with more, that is, a primary refrigerant air conditioning system in which one outdoor unit is connected to two or more indoor units through a pipe, and the outdoor side generally adopts an air cooling heat exchange manner, and the indoor side generally adopts a direct evaporation heat exchange manner. In order to overcome the defect that the exhaust superheat degree of a compressor in the initial stage of low-temperature heating starting of the existing multi-connected air conditioning system rises slowly, the low-pressure condition and the exhaust superheat degree condition of the air conditioning system need to be considered in the initial stage of low-temperature heating starting in a two-way mode, and the condition that the exhaust superheat degree of the compressor is too small due to too low pressure is avoided. Therefore, the embodiment of the application provides that the low-pressure saturation temperature, the high-pressure saturation temperature and the air conditioner exhaust temperature are required to be obtained when the air conditioner working mode is detected to be the heating mode.
For example, the indoor unit can monitor the power-on state of the four-way valve in real time, when the power-on state of the four-way valve is detected to be power-on, the working mode of the air conditioner is judged to be a heating mode at the moment, and when the power-on state of the four-way valve is detected to be power-off, the working mode of the air conditioner is judged to be a cooling mode at the moment, so that the working mode of the air conditioner of the multi-connected air conditioning system is determined. In addition, the obtained low-pressure saturation temperature "Tls" can be used for analyzing whether the low pressure of the multi-connected air-conditioning system is too low currently, and the obtained high-pressure saturation temperature "Tps" and the air-conditioning exhaust temperature "Tp" are used for further obtaining the exhaust superheat degree "Tdsh" of the air-conditioning compressor under the condition that the low pressure of the multi-connected air-conditioning system is too low, so that whether the problem that the low pressure is too low is solved immediately is analyzed based on the exhaust superheat degree "Tdsh", and the operation reliability of the air conditioner is improved. The temperature acquisition step involved in the present embodiment will be described in detail below.
In one embodiment, this step includes: detecting an air-conditioning working mode of air-conditioning equipment; when the working mode of the air conditioner is detected to be a heating mode, acquiring low pressure of the air conditioner, high pressure of the air conditioner and exhaust temperature of the air conditioner; and acquiring low-pressure saturation temperature according to the low-pressure of the air conditioner, and acquiring high-pressure saturation temperature according to the high-pressure of the air conditioner.
Wherein, the pressure can be the vertical force acted on the unit area by the fluid, when the air flows along the wind-light inner wall of the air conditioning unit, the pressure can be divided into static pressure, dynamic pressure and full pressure, and the unit is mmHg or kgf/cm 2 Or Pa. The air conditioning low pressure may refer to a suction port pressure of the air conditioning compressor, and the air conditioning high pressure may refer to a discharge port pressure of the air conditioning compressor.
Specifically, the indoor unit can obtain the low pressure and the high pressure of the air conditioner before obtaining the low pressure saturation temperature and the high pressure saturation temperature, the high-pressure of the air conditioner can be acquired by a high-pressure sensor arranged between an outlet pipe of the oil separator and a high-pressure inlet pipe of the four-way valve, and the low-pressure of the air conditioner can be acquired by a low-pressure sensor arranged between an inlet pipe of the gas-liquid separator and a low-pressure outlet pipe of the four-way valve. The air conditioner exhaust temperature can be acquired by a top-pressing temperature sensor arranged at the top of the air conditioner compressor.
More specifically, after the indoor unit obtains the low-pressure of the air conditioner, the high-pressure of the air conditioner and the exhaust temperature of the air conditioner, the low-pressure saturation temperature can be calculated according to the low-pressure of the air conditioner, and the high-pressure saturation temperature can be calculated according to the high-pressure of the air conditioner, so that the abnormal conditions of the multi-connected air conditioning system in the initial stage of the current heating starting can be analyzed by using the low-pressure saturation temperature, the high-pressure saturation temperature and the exhaust temperature of the air conditioner. The saturation temperature acquisition step involved in the present embodiment will be described in detail below.
In one embodiment, the step of obtaining a low pressure saturation temperature according to the low pressure of the air conditioner and obtaining a high pressure saturation temperature according to the high pressure of the air conditioner includes: acquiring a first saturation temperature corresponding to the low pressure of the air conditioner and a second saturation temperature corresponding to the high pressure of the air conditioner based on a preset pressure-temperature comparison table; determining the first saturation temperature as the low pressure saturation temperature and determining the second saturation temperature as the high pressure saturation temperature.
The pressure-temperature comparison table may be a comparison table in which at least one set of "pressure-saturation temperature" correspondence is recorded.
Specifically, in practical application, a worker can set different pressure and temperature comparison tables according to the type of the refrigerant, and the corresponding pressure and temperature comparison tables are preconfigured for different multi-connected air conditioning systems for inquiry. Therefore, the indoor unit can acquire the corresponding preset pressure and temperature comparison table after detecting that the air conditioner working mode is the heating mode and the heating mode is started, further determine the first saturation temperature in the pressure and temperature comparison table by using the air conditioner low-pressure acquired at the current moment, and determine the second saturation temperature corresponding to the air conditioner high-pressure, so as to acquire the low-pressure saturation temperature and the high-pressure saturation temperature.
More specifically, the types of coolant mentioned above include, but are not limited to: ammonia, freon-12, freon-22, R-134A refrigerant, R-404A refrigerant, R-410A refrigerant, etc. For a specific type of refrigerant, the refrigerant pressure and temperature comparison data is fixed, the corresponding saturation temperature can be found with the refrigerant pressure, and the corresponding refrigerant pressure value can be found with the saturation temperature.
S202, if the low-pressure saturation temperature is smaller than or equal to a preset temperature threshold value, acquiring the exhaust superheat degree according to the high-pressure saturation temperature and the air conditioner exhaust temperature.
The temperature threshold may be a temperature critical value for analyzing whether the air conditioning system has a low-pressure too low condition, or a preset saturation temperature safety value corresponding to the low-pressure, for example, the temperature threshold is represented as "T1" and takes a value between-30 ℃ and-40 ℃.
Here, the superheating may refer to a process of heating the temperature of the steam to be higher than the saturation temperature at the corresponding pressure. The degree of superheat may refer to the difference between the temperature of the superheated steam and its saturation temperature. The discharge superheat may refer to a temperature difference between a compressor discharge or condenser inlet temperature and a saturation temperature corresponding to an actual condensing pressure, for example, the discharge superheat is expressed as "Tdsh" in units of "c.
Specifically, after the indoor unit acquires the low-pressure saturation temperature, the high-pressure saturation temperature and the air conditioner exhaust temperature, the relation between the low-pressure saturation temperature "Tls" and the temperature threshold value "T1" can be analyzed, if the low-pressure saturation temperature is detected to be smaller than or equal to the temperature threshold value, namely the low-pressure saturation temperature is detected to be smaller than or equal to T1", the situation that the low pressure of the multi-connected air conditioner system is too low can be judged, the exhaust superheat degree of an air conditioner compressor is further analyzed and determined, and whether corresponding control measures are needed to be taken for the too low pressure is judged.
For example, if the low-pressure saturation temperature "Tls = -52 ℃" and the preset temperature threshold "T1= -35 ℃" are acquired by the indoor unit, it may be determined that "Tls < T1", and the high-pressure saturation temperature and the air conditioner exhaust temperature should be analyzed subsequently to acquire the exhaust superheat degree. The exhaust superheat degree acquisition step relating to the present embodiment will be described in detail below.
In one embodiment, this step comprises: if the low-pressure saturation temperature is smaller than or equal to a preset temperature threshold value, calculating a temperature difference value between the air conditioner exhaust temperature and the high-pressure saturation temperature; and determining the temperature difference as the exhaust superheat degree.
Specifically, the exhaust superheat degree is obtained by calculating a temperature difference between the air conditioner exhaust temperature and the high-pressure saturation temperature, that is, analyzing the following formula "Tdsh = Tp-Tps" to obtain the exhaust superheat degree.
For example, if the air-conditioning discharge temperature "Tp =35 ℃" and the high-pressure saturation temperature "Tps = -25 ℃" acquired by the indoor unit, it is possible to determine the discharge superheat degree "Tdsh =35-25= -10 ℃".
For example, if the air-conditioning discharge temperature "Tp =15 ℃" and the high-pressure saturation temperature "Tps = -25 ℃" acquired by the indoor unit, it is possible to determine the degree of discharge superheat "Tdsh =15-25= -10 ℃".
In one embodiment, after this step, the air conditioning control method further includes: if the low-pressure saturation temperature is larger than the temperature threshold, acquiring a target frequency, wherein the target frequency is smaller than the current frequency; and controlling the air conditioner compressor to run according to the target frequency until the air conditioner working mode is detected to be a refrigerating mode or the exhaust superheat degree is smaller than the superheat degree threshold value.
The target frequency may be a compressor operating frequency calculated in real time by the indoor unit, and the target frequency may be calculated relative to the current frequency, for example, a frequency result reduced by a certain value based on the current frequency, or a frequency safety value preset to correspond to the initial operation of the heating start may be excluded, and the unit is "hertz".
Specifically, if the indoor unit detects that the low-pressure saturation temperature is greater than the temperature threshold value, that is, "Tls > T1" is detected, it may be determined that the multi-connected air conditioning system does not have a condition that the low pressure is too low, at this time, if the target frequency is less than the current frequency, it may be determined that the frequency reduction instruction is valid, and the indoor unit may control the air conditioning compressor to operate according to the target frequency until it is detected that the air conditioning operating mode is the cooling mode, or the exhaust superheat degree is less than the superheat degree threshold value.
For example, if the low-pressure saturation temperature "Tls =38 ℃" and the preset temperature threshold "T1= -35 ℃" are acquired by the indoor unit, it may be determined that "Tls is greater than T1", and the air conditioner compressor should be controlled to operate at the target frequency subsequently.
Further, although the present embodiment has been described in detail: when the indoor unit detects that the low-pressure saturation temperature is greater than the temperature threshold value, the indoor unit can control the air conditioner compressor to operate at a target frequency which is less than the current frequency, but it is also clear that: the above-mentioned limited target frequency is lower than the current frequency, and it is considered that the multi-connected air conditioning system has neither too low pressure nor slow rising of the exhaust superheat degree in the initial stage of the heating start, so the frequency reduction command is effective without limitation. Once the condition that the exhaust superheat degree of the multi-connected air conditioning system slowly rises in the initial stage of heating start is considered, the target frequency needs to be controlled, namely the target frequency cannot be excessively smaller than the current frequency, therefore, the frequency reduction instruction is limited and effective at the moment, and the control degree of the target frequency can be set according to actual business requirements.
S203, if the exhaust superheat degree is smaller than a preset superheat degree threshold value, controlling the air conditioner compressor to operate according to the current frequency until the exhaust superheat degree is larger than or equal to the superheat degree threshold value.
The superheat threshold may be a temperature threshold for analyzing whether the exhaust superheat of the air conditioning system is too small, or may be a minimum exhaust superheat within a normal operation range of the compressor required by a compressor manufacturer, for example, the superheat threshold is denoted by "Tpdsh" and takes a value between 5 ℃ and 10 ℃.
Specifically, after the indoor unit analyzes and acquires the exhaust superheat degree of the air-conditioning compressor, if the exhaust superheat degree is detected to be smaller than a preset superheat degree threshold value, the air-conditioning compressor can be controlled to operate according to the current frequency until the exhaust superheat degree is detected to be larger than or equal to the superheat degree threshold value again. The control is to prevent the exhaust superheat degree from being too small at the initial stage of heating start of the multi-connected air conditioning system, and the frequency reduction command is still executed to solve the problem of too low pressure.
For example, if the exhaust superheat degree "Tdsh =12℃" and the preset temperature threshold "Tpdsh =15℃" are obtained by the indoor unit, it may be determined that "Tdsh is smaller than Tpdsh", and the air-conditioning compressor should be controlled to operate at the current frequency subsequently until it is detected that the exhaust superheat degree is greater than or equal to the superheat degree threshold again, and the air-conditioning compressor may be controlled to operate at the target frequency smaller than the current frequency, so as to solve the problem of too low pressure under the condition that the exhaust superheat degree is normal.
In one embodiment, after this step, the air conditioning control method further includes: if the exhaust superheat degree is larger than or equal to the superheat degree threshold value, acquiring a target frequency, wherein the target frequency is smaller than the current frequency; and controlling the air conditioner compressor to run according to the target frequency until the air conditioner working mode is detected to be a refrigerating mode or the exhaust superheat degree is smaller than the superheat degree threshold value.
Specifically, in the foregoing embodiment, after the indoor unit analyzes and acquires the exhaust superheat of the air-conditioning compressor, if it is detected that the exhaust superheat is greater than or equal to the preset superheat threshold, the indoor unit may control the air-conditioning compressor to operate at a target frequency that is less than the current frequency, so as to solve the problem of too low pressure when the exhaust superheat is normal.
For example, if the indoor unit obtains the exhaust superheat degree "Tdsh =18 ℃" and the preset temperature threshold value "Tpdsh =15 ℃", it may be determined that "Tdsh > Tpdsh", and the air conditioner compressor may be subsequently controlled to operate at a target frequency that is lower than the current frequency, where the current frequency may be "20Hz", and the target frequency may be "15Hz".
In the air conditioner control method in the embodiment, the indoor unit obtains the low-pressure saturation temperature, the high-pressure saturation temperature and the air conditioner exhaust temperature when detecting that the air conditioner working mode is the heating mode, so that when detecting that the low-pressure saturation temperature is smaller than or equal to the preset temperature threshold, the exhaust superheat degree is obtained according to the high-pressure saturation temperature and the air conditioner exhaust temperature, and further when the exhaust superheat degree is smaller than the preset superheat degree threshold, the air conditioner compressor is controlled to operate according to the current frequency until the exhaust superheat degree is larger than or equal to the superheat degree threshold, so that the problem that the exhaust superheat degree of the compressor is slowly increased to be too small when the problem of low pressure and over-low pressure is solved in a frequency reduction mode is avoided, further, the phenomenon that the exhaust superheat degree is insufficient and the shutdown is protected is avoided, the service life of the compressor is prolonged, and the reliability of the air conditioner operation is finally improved.
In order to enable those skilled in the art to fully understand the air conditioner control scheme provided by the present application, the present application further provides an application scenario, where the air conditioner control method and the multi-split air conditioning system described above are applied. Specifically, the application of the air conditioner control method in the application scenario will be described as follows with reference to fig. 3:
as shown in fig. 3, the air conditioning control scheme proposed by the present application includes the following steps:
step 301, the multi-connected air conditioning system receives a starting signal, the compressor is ready to start, and step 302 is executed;
step 302, the multi-connected air conditioning system is in a heating mode or a cooling mode, if the multi-connected air conditioning system is in the heating mode, step 304 is executed, and if the multi-connected air conditioning system is in the cooling mode, step 303 is executed;
step 303, the multi-connected air conditioning system is in a refrigeration mode, a refrigeration mode compressor is started, and the step 301 is executed again;
step 304, the multi-connected air conditioning system is in a heating mode, a compressor in the heating mode is started, and step 305 is executed;
305, detecting the low pressure of the system in real time by a low pressure sensor, and calculating a low pressure saturation temperature Tls corresponding to the low pressure; the high-pressure sensor detects the high-pressure of the system in real time and calculates the high-pressure saturation temperature Tps corresponding to the high-pressure; detecting the top temperature Tp of the compressor in real time by a top-pressing temperature sensor, and executing step 306;
step 306, the multi-connected air conditioning system judges that Tls is less than or equal to Tl in real time, the Tl is a saturation temperature safety value (the recommended interval is-30 to-40 ℃) corresponding to the low-pressure preset by the main control, step 307 is executed when the condition is met, and step 310 is executed otherwise;
step 307, calculating the exhaust superheat degree Tdsh = Tp-Tps in real time by the multi-connected air conditioning system, and executing step 308;
step 308, the multi-connected air conditioning system judges whether the system exhaust superheat Tdsh is larger than or equal to Tpdsh in real time, wherein the Tpdsh is the lowest exhaust superheat (the recommended interval is 5-10 ℃) in the normal operation range of the compressor required by a compressor manufacturer, the step 309 is executed when the condition is met, and the step 310 is executed otherwise;
309, operating the compressors of the multi-connected air conditioning system according to the instruction frequency, effectively reducing the frequency, and returning to execute the step 301;
and step 310, maintaining the frequency of the compressor of the multi-connected air conditioning system to be operated at the current frequency, invalidating the frequency reduction instruction, and executing step 306.
According to the air conditioner control method provided by the embodiment, the air conditioner compressor can maintain the current frequency to operate for heating by setting the air conditioner system to be in the state of low pressure and too low and the superheat degree does not meet the requirement, and the low pressure and too low frequency reduction instruction is invalid, so that the superheat degree of exhaust gas can be promoted to rise rapidly. The air conditioning system is set to be in a low-pressure and low-temperature state, when the superheat degree meets the requirement, the air conditioning compressor can operate to heat according to the instruction frequency, and the low-pressure and low-temperature frequency reduction instruction is effective, so that the low-pressure control requirement of the system is met. By adopting the method, the technical defect that the exhaust superheat degree of the compressor rises slowly at the initial stage of low-temperature heating starting can be overcome, the service life of the compressor is prolonged, and the operation reliability of the whole machine is enhanced.
In order to better implement the air conditioning control method in the embodiment of the present application, on the basis of the air conditioning control method, an air conditioning control device is further provided in the embodiment of the present application, as shown in fig. 4, the air conditioning control device 400 includes:
the mode detection module 410 is used for acquiring a low-pressure saturation temperature, a high-pressure saturation temperature and an air conditioner exhaust temperature when the air conditioner working mode is detected to be a heating mode;
the data analysis module 420 is configured to, when it is detected that the low-pressure saturation temperature is less than or equal to a preset temperature threshold, obtain an exhaust superheat degree according to the high-pressure saturation temperature and the air conditioner exhaust temperature;
and the air conditioner control module 430 is used for controlling the air conditioner compressor to operate according to the current frequency when the exhaust superheat degree is detected to be less than a preset superheat degree threshold value until the exhaust superheat degree is greater than or equal to the superheat degree threshold value.
In some embodiments of the present application, the air conditioning control module 430 is further configured to obtain a target frequency when detecting that the exhaust superheat is greater than or equal to the superheat threshold, the target frequency being less than the current frequency; and controlling the air conditioner compressor to run according to the target frequency until the air conditioner working mode is detected to be a refrigerating mode or the exhaust superheat degree is smaller than the superheat degree threshold value.
In some embodiments of the present application, the air conditioner control module 430 is further configured to obtain a target frequency when it is detected that the low pressure saturation temperature is greater than the temperature threshold, where the target frequency is less than the current frequency; and controlling the air conditioner compressor to run according to the target frequency until the air conditioner working mode is detected to be a refrigerating mode or the exhaust superheat degree is smaller than the superheat degree threshold value.
In some embodiments of the present application, the mode detection module 410 is further configured to detect an air conditioning operation mode of the air conditioning equipment; when the working mode of the air conditioner is detected to be a heating mode, acquiring low pressure of the air conditioner, high pressure of the air conditioner and exhaust temperature of the air conditioner; and acquiring low-pressure saturation temperature according to the low-pressure of the air conditioner, and acquiring high-pressure saturation temperature according to the high-pressure of the air conditioner.
In some embodiments of the present application, the mode detection module 410 is further configured to obtain a first saturation temperature corresponding to the low pressure of the air conditioner and obtain a second saturation temperature corresponding to the high pressure of the air conditioner based on a preset pressure-temperature comparison table; determining the first saturation temperature as the low pressure saturation temperature and determining the second saturation temperature as the high pressure saturation temperature.
In some embodiments of the present application, the data analysis module 420 is further configured to calculate a temperature difference between the air conditioner exhaust temperature and the high pressure saturation temperature when it is detected that the low pressure saturation temperature is less than or equal to a preset temperature threshold; and determining the temperature difference as the superheat degree of the exhaust gas.
In the above embodiment, when the indoor unit detects that the air conditioner operating mode is the heating mode, the low-pressure saturation temperature, the high-pressure saturation temperature and the air conditioner exhaust temperature are acquired, so that when the low-pressure saturation temperature is detected to be less than or equal to the preset temperature threshold, the exhaust superheat degree is acquired according to the high-pressure saturation temperature and the air conditioner exhaust temperature, and further when the exhaust superheat degree is less than the preset superheat degree threshold, the air conditioner compressor is controlled to operate according to the current frequency until the exhaust superheat degree is greater than or equal to the superheat degree threshold, the problem that when the problem of too low pressure and too low pressure is solved in a frequency reduction mode, the exhaust superheat degree of the compressor rises slowly to an excessively low degree is avoided, further, the phenomenon that the exhaust superheat degree is insufficient to protect the shutdown is avoided, the service life of the compressor is prolonged, and the reliability of the air conditioner operation is finally improved.
For specific limitations of the air conditioning control device, reference may be made to the above limitations of the air conditioning control method, which are not described herein again. The respective modules in the air conditioner control device may be wholly or partially implemented by software, hardware, and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In some embodiments of the present application, the air conditioning control apparatus 400 may be implemented in the form of a computer program that is executable on a computer device such as that shown in fig. 5. The memory of the computer device may store various program modules constituting the air conditioning control apparatus 400, such as a mode detection module 410, a data analysis module 420, and an air conditioning control module 430 shown in fig. 4. The computer program constituted by the respective program modules causes the processor to execute the steps in the air conditioning control method of the respective embodiments of the present application described in the present specification.
For example, the computer device shown in fig. 5 may perform step S201 through the mode detection module 410 in the air conditioning control apparatus 400 shown in fig. 4. The computer device may perform step S202 through the data analysis module 420. The computer device may perform step S203 through the air conditioner control module 430. The computer device includes a processor, a memory, and a network interface connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operating system and the computer program to run on the non-volatile storage medium. The network interface of the computer device is used for communicating with an external computer device through a network connection. The computer program is executed by a processor to implement an air conditioning control method.
Those skilled in the art will appreciate that the architecture shown in fig. 5 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In some embodiments of the present application, there is provided a computer device comprising one or more processors; a memory; and one or more application programs, wherein the one or more application programs are stored in the memory and configured to be executed by the processor to perform the steps of the air conditioner control method. Here, the steps of the air conditioning control method may be the steps in the air conditioning control method of each of the above embodiments.
In some embodiments of the present application, a computer-readable storage medium is provided, which stores a computer program, and the computer program is loaded by a processor, so that the processor executes the steps of the air conditioner control method. Here, the steps of the air conditioning control method may be the steps in the air conditioning control method of each of the above embodiments.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a non-volatile computer-readable storage medium, and can include the processes of the embodiments of the methods described above when the computer program is executed. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM).
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The air conditioner control method, the air conditioner control device, the air conditioning equipment and the computer readable storage medium provided by the embodiments of the present application are described in detail above, and a specific example is applied in the present application to explain the principle and the implementation of the present invention, and the description of the above embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for those skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (9)
1. An air conditioner control method, characterized in that the method comprises:
detecting an air conditioner working mode of air conditioning equipment;
when the working mode of the air conditioner is detected to be a heating mode, acquiring low pressure of the air conditioner, high pressure of the air conditioner and exhaust temperature of the air conditioner; the low-pressure of the air conditioner is acquired by a low-pressure sensor arranged between an inlet pipe of the gas-liquid separator and a low-pressure outlet pipe of the four-way valve; the high-pressure of the air conditioner is acquired by a high-pressure sensor arranged between an outlet pipe of the oil separator and a high-pressure inlet pipe of the four-way valve;
acquiring low-pressure saturation temperature according to the low-pressure of the air conditioner, and acquiring high-pressure saturation temperature according to the high-pressure of the air conditioner;
if the low-pressure saturation temperature is smaller than or equal to a preset temperature threshold value, calculating a temperature difference value between the air conditioner exhaust temperature and the high-pressure saturation temperature as an exhaust superheat degree;
and if the exhaust superheat degree is smaller than a preset superheat degree threshold value, controlling the air conditioner compressor to operate according to the current frequency until the exhaust superheat degree is larger than or equal to the superheat degree threshold value, so that the exhaust superheat degree of the compressor is rapidly increased when the air conditioner equipment is in the initial stage of low-temperature heating starting.
2. The air conditioning control method as claimed in claim 1, wherein after said step of calculating a temperature difference between said air conditioning discharge temperature and said high pressure saturation temperature as a discharge superheat degree if said low pressure saturation temperature is less than or equal to a preset temperature threshold, further comprising:
if the exhaust superheat degree is larger than or equal to the superheat degree threshold value, acquiring a target frequency, wherein the target frequency is smaller than the current frequency;
and controlling the air conditioner compressor to run according to the target frequency until the air conditioner working mode is detected to be a refrigerating mode or the exhaust superheat degree is smaller than the superheat degree threshold value.
3. The air conditioner control method as claimed in claim 1, further comprising, after the step of obtaining a low pressure saturation temperature according to the air conditioner low pressure and obtaining a high pressure saturation temperature according to the air conditioner high pressure:
if the low-pressure saturation temperature is larger than the temperature threshold, acquiring a target frequency, wherein the target frequency is smaller than the current frequency;
and controlling the air conditioner compressor to run according to the target frequency until the air conditioner working mode is detected to be a refrigerating mode or the exhaust superheat degree is smaller than the superheat degree threshold value.
4. The air conditioner control method as claimed in claim 1, wherein the step of obtaining a low pressure saturation temperature according to the air conditioner low pressure and obtaining a high pressure saturation temperature according to the air conditioner high pressure comprises:
acquiring a first saturation temperature corresponding to the low pressure of the air conditioner and a second saturation temperature corresponding to the high pressure of the air conditioner based on a preset pressure-temperature comparison table;
determining the first saturation temperature as the low pressure saturation temperature and determining the second saturation temperature as the high pressure saturation temperature.
5. The air conditioning control method according to claim 1, wherein the temperature threshold value is between-30 ℃ and-40 ℃.
6. An air conditioning control apparatus, characterized in that the apparatus comprises:
the mode detection module is used for detecting the air conditioner working mode of the air conditioner; when the working mode of the air conditioner is detected to be a heating mode, acquiring the low pressure of the air conditioner, the high pressure of the air conditioner and the exhaust temperature of the air conditioner; the low-pressure of the air conditioner is acquired by a low-pressure sensor arranged between an inlet pipe of the gas-liquid separator and a low-pressure outlet pipe of the four-way valve; the high-pressure of the air conditioner is acquired by a high-pressure sensor arranged between an outlet pipe of the oil separator and a high-pressure inlet pipe of the four-way valve; acquiring low-pressure saturation temperature according to the low-pressure of the air conditioner, and acquiring high-pressure saturation temperature according to the high-pressure of the air conditioner;
the data analysis module is used for calculating the temperature difference value between the air conditioner exhaust temperature and the high-pressure saturation temperature as the exhaust superheat degree when the low-pressure saturation temperature is detected to be smaller than or equal to a preset temperature threshold value;
and the air conditioner control module is used for controlling the air conditioner compressor to operate according to the current frequency when the exhaust superheat degree is detected to be smaller than a preset superheat degree threshold value until the exhaust superheat degree is larger than or equal to the superheat degree threshold value, so that the exhaust superheat degree of the compressor is rapidly increased when the air conditioner equipment is in the initial stage of low-temperature heating starting.
7. An air conditioning system, characterized in that the air conditioning system comprises: an air conditioning apparatus, and a controller for controlling the air conditioning apparatus; the controller is in communication connection with the air conditioning equipment; the air conditioning equipment comprises a high-pressure sensor, a low-pressure sensor, a top-pressing temperature sensor and an air conditioning compressor, wherein,
the controller controls the air conditioner according to the method of any one of claims 1 to 5.
8. The air conditioning system of claim 7, wherein the air conditioning apparatus further comprises an oil separator, a four-way valve, and a gas-liquid separator, wherein,
the high-pressure sensor is arranged between an outlet pipe of the oil separator and a high-pressure inlet pipe of the four-way valve and is used for collecting high-pressure of an air conditioner to obtain the high-pressure saturation temperature;
the low-pressure sensor is arranged between an inlet pipe of the gas-liquid separator and a low-pressure outlet pipe of the four-way valve and is used for collecting the low-pressure of the air conditioner so as to obtain the low-pressure saturation temperature;
and the top pressing temperature sensor is arranged at the top of the air conditioner compressor and used for collecting the air conditioner exhaust temperature.
9. A computer-readable storage medium, having stored thereon a computer program which is loaded by a processor to perform the steps in the air-conditioning control method of any one of claims 1 to 5.
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