CN110793151B - Multi-split refrigerant control method and device, air conditioner and storage medium - Google Patents

Multi-split refrigerant control method and device, air conditioner and storage medium Download PDF

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Publication number
CN110793151B
CN110793151B CN201911133386.2A CN201911133386A CN110793151B CN 110793151 B CN110793151 B CN 110793151B CN 201911133386 A CN201911133386 A CN 201911133386A CN 110793151 B CN110793151 B CN 110793151B
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temperature
refrigerant
preset
power module
split
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CN110793151A (en
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陈东
任小辉
吉金浩
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Ningbo Aux Electric Co Ltd
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Ningbo Aux Electric Co Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/30Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/50Control or safety arrangements characterised by user interfaces or communication
    • F24F11/52Indication arrangements, e.g. displays
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/62Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63Electronic processing
    • F24F11/64Electronic processing using pre-stored data
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/62Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63Electronic processing
    • F24F11/65Electronic processing for selecting an operating mode
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/70Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/88Electrical aspects, e.g. circuits
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00Control inputs relating to system states
    • F24F2140/20Heat-exchange fluid temperature

Abstract

The invention discloses a multi-split refrigerant control method, a multi-split refrigerant control device, an air conditioner and a storage medium, wherein the method comprises the following steps: acquiring the temperature of a coil, the temperature of a refrigerant cooling plate and the temperature of a power module plate; and when the difference value between the temperature of the refrigerant cooling plate and the temperature of the coil pipe is smaller than a first preset temperature threshold value, controlling the multi-split refrigerant according to the temperature of the refrigerant cooling plate and the temperature of the power module plate. According to the method and the device, the current running state of the multi-split air conditioning unit is obtained according to the temperature of the coil pipe, the temperature of the refrigerant cooling plate and the temperature of the power module plate, so that the multi-split system is effectively adjusted, the refrigerant quantity control of the multi-split system meets the requirement, the running effect of the multi-split air conditioning unit is guaranteed, and the user experience is improved.

Description

Multi-split refrigerant control method and device, air conditioner and storage medium
Technical Field
The invention relates to the technical field of air conditioners, in particular to a multi-split refrigerant control method and device, an air conditioner and a storage medium.
Background
The multi-split air conditioning unit is an annular pipe network system consisting of a compressor, an electronic expansion valve, other valve bodies and serial pipelines. The temperature can be intelligently adjusted by the multi-split air conditioner, the temperature is accurately controlled, and each indoor unit can be independently adjusted, so that the requirements of different spaces and different air conditioner loads can be met. Besides, the multi-split air conditioner also has the advantages of energy conservation, convenience in installation and the like. The use of multiple online systems is therefore becoming more widespread.
With the increasing requirements of people on the operation effect of an air conditioning system, the traditional air conditioner cannot meet the market demand, and particularly for a multi-split air conditioning unit, the requirement on the control of the refrigerant quantity of the system is higher due to the fact that the refrigerant quantity of the multi-split air conditioning unit is larger and the indoor operation load variability is larger. When the indoor operation load variability is large, the control on the refrigerant quantity of the multi-split air conditioning unit cannot meet the requirement, the operation effect of the multi-split air conditioning unit is affected, and therefore the comfortable experience of a user is affected.
Disclosure of Invention
The invention solves the problem of how to reasonably control the refrigerant quantity so as to ensure the operation effect of the multi-split air conditioning unit.
In order to solve the above problem, in a first aspect, the present invention provides a method for controlling a multi-split refrigerant, including the following steps:
acquiring the temperature of a coil, the temperature of a refrigerant cooling plate and the temperature of a power module plate;
and when the difference value between the temperature of the refrigerant cooling plate and the temperature of the coil pipe is smaller than a first preset temperature threshold value, controlling the multi-split refrigerant according to the temperature of the refrigerant cooling plate and the temperature of the power module plate.
In the multi-split system, the current running state of the multi-split system can be obtained according to the temperature of the coil pipe, the temperature of the cooling medium cooling plate and the temperature of the power module plate, so that the cooling medium of the multi-split system can be effectively adjusted. When the difference between the temperature of the cooling medium cooling plate and the temperature of the coil pipe is smaller than a first preset temperature threshold value, the temperature of the power module plate and the temperature of the cooling medium cooling plate reasonably control the cooling medium of the multi-split air conditioner, so that the control of the cooling medium of the multi-split air conditioner can meet the requirement, the operation effect of the multi-split air conditioner unit is guaranteed, and the use experience of a user is improved.
Further, the controlling the multi-split refrigerant according to the refrigerant cooling plate temperature and the power module plate temperature includes:
and when the difference value between the temperature of the power module plate and the temperature of the refrigerant cooling plate is determined to be smaller than or equal to the first preset temperature threshold value and the temperature of the power module plate is greater than the second preset temperature threshold value continuously for a first preset time, performing special control on the multi-split air conditioner in different operation modes.
In the multi-split air conditioning unit, because the temperature of the coil, the temperature of the refrigerant cooling plate and the temperature of the power module plate are changed in real time when the multi-split air conditioning unit operates, in order to avoid misjudgment, the special control of the multi-split air conditioning unit in different operation modes is determined according to the condition that the difference value between the temperature of the power module plate and the temperature of the refrigerant cooling plate in a continuous period of time is less than or equal to a first preset temperature threshold value, and the temperature of the power module plate is greater than a second preset temperature threshold value, so that the refrigerant quantity control of the multi-split air conditioning unit can meet the requirement, the operation effect of the multi-split air conditioning unit cannot be influenced, and the comfort level of a user is ensured.
Further, the performing special control on the multi-split air conditioner in different operation modes includes:
when the operation mode is a refrigeration mode, correcting the target superheat degree of the difference value between the evaporator outlet pipe temperature and the evaporator inlet pipe temperature at intervals of second preset time until the special control is exited when the exhaust temperature, the high pressure or the low pressure meet preset conditions;
and when the operation mode is a heating mode, adjusting the opening degree of the electronic expansion valve of the outdoor unit at intervals of second preset time until the exhaust temperature, high pressure or low pressure meet preset conditions, and quitting the special control.
In the multi-split air-conditioning system, during refrigerating operation, the opening degree of an electronic expansion valve of an inner machine is adjusted by correcting the target superheat degree of the difference value between the outlet pipe temperature of the evaporator and the inlet pipe temperature of the evaporator, the throttling condition of a refrigerant in the multi-split air-conditioning system is controlled, and the amount of the refrigerant is reasonably controlled, so that the multi-split air-conditioning system meets the current refrigerating requirement of a user, and the operation effect of the multi-split air-conditioning system is ensured; during heating operation, the throttling condition of the refrigerant in the multi-split system is controlled by adjusting the opening of the electronic expansion valve of the outer unit, and the amount of the refrigerant is reasonably controlled, so that the multi-split system meets the current heating requirement of a user, and the operation effect of the multi-split system is ensured.
Further, the correcting the target superheat degree of the difference between the evaporator outlet pipe temperature and the evaporator inlet pipe temperature every second preset time interval comprises:
and increasing the target superheat degree by a preset superheat value every second preset time until the sum of the increased preset superheat values reaches a preset superheat threshold value.
In the multi-split system, the target superheat value is increased by the preset superheat value, the correction of the target superheat value is realized, and then the preset superheat threshold value for limiting the correction of the target superheat value is used, so that the condition that the opening of an electronic expansion valve of an inner machine is too small or even becomes zero is avoided, the flow of a refrigerant is reasonably controlled, the operation effect of the multi-split system is ensured, the operation state of the multi-split system is always in accordance with the current environment, and the comfort level of a user is improved.
Further, the adjusting the opening degree of the outdoor unit electronic expansion valve every second preset time includes:
and reducing the opening degree of the electronic expansion valve of the outdoor unit by a preset opening degree value every second preset time until the sum of the reduced preset opening degree values reaches a preset opening degree threshold value.
In the multi-split system, the preset opening value is reduced by the opening of the outer machine electronic expansion valve, the opening of the outer machine electronic expansion valve is adjusted, and the preset opening threshold value limiting the opening of the outer machine electronic expansion valve is used for avoiding that the opening of the outer machine electronic expansion valve is too small or even becomes zero, so that the amount of refrigerant is reasonably controlled, the multi-split system has a good operation effect, and the use requirements of users are met.
Further, the exiting the special control when the exhaust temperature, the high pressure or the low pressure satisfies a preset condition includes:
and when the exhaust temperature is higher than a preset exhaust temperature threshold, the saturation temperature corresponding to the high pressure is higher than a preset high pressure saturation temperature threshold, or the saturation temperature corresponding to the low pressure is lower than a preset low pressure saturation temperature threshold, the special control is exited.
In the multi-split air-conditioning system, a refrigerant is compressed from a compressor to be changed into high-temperature high-pressure gas, and the excessive refrigerant amount of the multi-split air-conditioning system can be known through the fact that the exhaust temperature is higher than a preset exhaust temperature threshold value or the saturation temperature corresponding to the high pressure is higher than a preset high pressure saturation temperature threshold value, so that the special control is quitted, the operation effect of the multi-split air-conditioning system is not influenced, and the multi-split air-conditioning system is always in an optimal control state; the refrigerant is changed into liquid after exchanging heat with air in the heat exchanger, and the saturation temperature corresponding to the low pressure is lower than the preset low-pressure saturation temperature threshold value, so that the refrigerant quantity of the multi-split air-conditioning system is known to be too much, and the multi-split air-conditioning system quits the special control, thereby avoiding influencing the operation effect of the multi-split air-conditioning system and enabling the multi-split air-conditioning system to be in the optimal control state all the time.
Further, the controlling the multi-split refrigerant according to the temperature of the power module plate and the temperature of the refrigerant cooling plate further comprises:
and when the difference value between the temperature of the power module board and the temperature of the refrigerant cooling board is larger than a third preset temperature threshold value and the temperature of the power module board is larger than a fourth preset temperature threshold value, generating a first indicating signal, wherein the first indicating signal is used for indicating that the power module board is not installed in place or the power module board is abnormal.
In the multi-split system, the current running state of the multi-split system can be obtained through the temperature of the refrigerant cooling plate and the temperature of the module, the difference value between the temperature of the power module plate and the temperature of the refrigerant cooling plate can be utilized to determine that the power module plate is not installed in place or the power module plate is abnormal, and then an indicating signal of a warning lamp flickering or corresponding fault code displaying is generated to remind a user to actively maintain the multi-split system, the multi-split system is effectively adjusted, and the refrigerant control of the multi-split system caused by the fact that the power module plate is not installed in place or the power module plate is abnormal is avoided from being unreasonable, so that the running effect of the multi-split system is poor, and the comfortable experience of the user is influenced.
Further, the method for controlling the multi-split refrigerant further comprises the following steps:
and when the difference between the temperature of the refrigerant cooling plate and the temperature of the coil pipe is determined to be greater than or equal to the first preset temperature threshold value continuously for the first preset time and the temperature of the power module plate is greater than a fifth preset temperature threshold value, generating a second indicating signal, wherein the second indicating signal is used for indicating that the refrigerant cooling plate and the power module plate are not firmly connected or the refrigerant cooling plate and the power module plate are not connected.
In the multi-split system, the current running state of the multi-split system can be obtained through the temperature of the coil pipe and the temperature of the refrigerant cooling plate, the fact that the refrigerant cooling plate is not firmly connected with the power module plate or the refrigerant cooling plate is not connected with the power module plate is determined according to the difference value of the temperature of the refrigerant cooling plate and the temperature of the coil pipe, and then an indicating signal that a warning lamp flickers or displays a corresponding fault code is generated to remind a user to actively maintain the multi-split system, the multi-split system is effectively adjusted, and the situation that the multi-split system is poor in running effect and the comfort level of the user due to the fact that the refrigerant control of the multi-split system is unreasonable because the refrigerant cooling plate is not firmly connected with the power module plate or the refrigerant cooling plate is not connected with the power module plate is avoided.
Further, before the step of obtaining the temperature of the coil pipe, the temperature of the refrigerant cooling plate and the temperature of the power module plate, the method further comprises the following steps:
and controlling the continuous operation for a third preset time after the startup.
In the multi-split air-conditioning system, the obtained coil temperature, the refrigerant cooling plate temperature and the power module plate temperature are more accurate by controlling the multi-split air-conditioning system to continuously run for a period of time after the multi-split air-conditioning system is started, and the reliability of the multi-split air-conditioning refrigerant control method is ensured, so that the multi-split air-conditioning system can be effectively adjusted, the refrigerant quantity can be reasonably controlled, the running effect of the multi-split air-conditioning system is ensured, and the comfort requirement of a user is met.
In a second aspect, the present invention further provides a multi-split refrigerant control device, including:
the system comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring the temperature of a coil pipe, the temperature of a refrigerant cooling plate and the temperature of a power module plate;
and the processing unit is used for controlling the multi-split refrigerant according to the temperature of the coil pipe, the temperature of the refrigerant cooling plate and the temperature of the power module plate.
The multi-split refrigerant control device is used for realizing the multi-split refrigerant control method, so that the multi-split refrigerant control device at least has all the technical effects of the multi-split refrigerant control method.
In a third aspect, the present invention further provides an air conditioner, including a computer readable storage medium storing a computer program and a processor, where when the computer program is read and executed by the processor, the multi-split refrigerant control method is implemented.
The technical scheme of the air conditioner at least comprises all technical schemes of the multi-split refrigerant control method, so that the air conditioner at least has all technical effects of the multi-split refrigerant control method.
Further, the air conditioner further comprises a coil pipe temperature sensor arranged on the coil pipe, a refrigerant cooling plate temperature sensor arranged on the refrigerant cooling plate, and a power module plate temperature sensor arranged on the power module plate, wherein the coil pipe temperature sensor is used for collecting the coil pipe temperature, the refrigerant cooling plate temperature sensor is used for collecting the refrigerant cooling plate temperature, and the power module plate temperature sensor is used for collecting the power module plate temperature.
According to the temperature of the coil pipe, the temperature of the refrigerant cooling plate and the temperature of the power module plate, the current running state of the multi-split system can be obtained, and therefore the multi-split system can be effectively adjusted.
In a fourth aspect, the present invention further provides a computer-readable storage medium, where a computer program is stored, and when the computer program is read and executed by a processor, the method for controlling refrigerant in multiple refrigerant lines is implemented.
The technical scheme of the computer readable storage medium at least comprises all technical schemes of the multi-split refrigerant control method, so that the technical effects of the multi-split refrigerant control method are at least achieved.
Drawings
Fig. 1 is a schematic flow chart of a refrigerant control method of a multi-split air conditioner according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating a structure of a portion of a multi-split air conditioner according to an embodiment of the present invention;
FIG. 3 is a flow chart illustrating a refrigerant control method of the multi-split air conditioner according to an embodiment of the present invention;
fig. 4 is a block diagram of a refrigerant control device of the multi-split air conditioner according to an embodiment of the present invention.
Description of reference numerals:
1-coil pipe, 2-coil pipe temperature sensor,
3-refrigerant cooling plate, 4-refrigerant cooling plate temperature sensor,
5-power module board, 6-power module board temperature sensor.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
It should be noted that in the following description, suffixes such as "module", "component", or "unit" used to indicate elements are used only for facilitating the description of the present invention, and have no specific meaning in themselves. Thus, "module", "component" or "unit" may be used mixedly.
In a first aspect, as shown in fig. 1, a method for controlling a multi-split refrigerant according to an embodiment of the present invention includes the following steps:
s10: acquiring the temperature of a coil, the temperature of a refrigerant cooling plate and the temperature of a power module plate;
s20: and when the difference value between the temperature of the refrigerant cooling plate and the temperature of the coil pipe is smaller than a first preset temperature threshold value, controlling the multi-split refrigerant according to the temperature of the refrigerant cooling plate and the temperature of the power module plate.
The coil temperature is defined as T1, the refrigerant cooling plate temperature is defined as T2, the power module plate temperature is defined as T3, the difference between the refrigerant cooling plate temperature and the coil temperature is defined as Δ T1, Δ T1 is T2-T1, and the first preset temperature threshold is defined as a.
Specifically, as shown in fig. 2, the coil 1 in the multi-split air conditioner may pass through a plurality of refrigerant cooling plates 3, the power module plate 5 covers the refrigerant cooling plates 3, the coil temperature T1 may be obtained in real time by the coil temperature sensor 2 disposed at the coil 1, the refrigerant cooling plate temperature T2 may be obtained in real time by the refrigerant cooling plate temperature sensor 4 disposed on the refrigerant cooling plates 3, and the power module plate temperature T3 may be obtained in real time by the power module plate temperature sensor 6 disposed on the power module plate 5.
Among them, the power module board 5 is also called as IPM module board or inverter board, and is generally installed on an outdoor unit, and is one of the most important parts of the inverter air conditioner. It not only integrates the power switch device and the driving circuit, but also embeds the fault detecting circuit of over-voltage, over-current and over-heat, and can send the detecting signal to the processor. The power module comprises a high-speed low-power-consumption tube core, an optimized gate driving circuit and a quick protection circuit, and can ensure that the power module plate is not damaged even if a load accident or improper use occurs. The power module board is mainly used for a frequency converter and frequency conversion speed regulation of a driving motor, once a problem occurs in the power module board, the air conditioner can not work normally, and generally, after the power module board is determined to be damaged, only the power module board with the same model needs to be replaced.
In addition, the value range of the first preset temperature threshold value A is 15-25 ℃, preferably 20 ℃, because when the difference value between the temperature of the refrigerant cooling plate and the temperature of the coil is smaller than the first preset temperature threshold value, the multi-split refrigerant is controlled according to the temperature of the refrigerant cooling plate and the temperature of the power module plate, in order to not influence the reliability of the power module plate 5 and ensure the judgment accuracy, the first preset temperature threshold value which is too small cannot be selected, and otherwise, the judgment is mistaken; in order to ensure the timeliness of the multi-split air conditioner refrigerant control, a first preset temperature threshold which is too large cannot be selected, otherwise, the refrigerant control is seriously and unreasonable.
In this embodiment, according to the temperature of the coil pipe, the temperature of the cooling medium cooling plate, and the temperature of the power module plate, the operating state of the current multi-split system can be acquired, so that the cooling medium of the multi-split system can be effectively adjusted. When the difference between the temperature of the cooling medium cooling plate and the temperature of the coil pipe is smaller than a first preset temperature threshold value, the temperature of the power module plate and the temperature of the cooling medium cooling plate reasonably control the cooling medium of the multi-split air conditioner, so that the control of the cooling medium of the multi-split air conditioner can meet the requirement, the operation effect of the multi-split air conditioner unit is guaranteed, and the use experience of a user is improved.
Optionally, the controlling a multi-split refrigerant according to the refrigerant cooling plate temperature and the power module plate temperature includes:
and when the difference value between the temperature of the power module plate and the temperature of the refrigerant cooling plate is determined to be smaller than or equal to the first preset temperature threshold value and the temperature of the power module plate is greater than the second preset temperature threshold value continuously for a first preset time, performing special control on the multi-split air conditioner in different operation modes.
The first preset time is defined as M, the difference between the power module plate temperature and the refrigerant cooling plate temperature is defined as Δ T2, Δ T2 is T3-T2, and the second preset temperature threshold is defined as C.
Specifically, as shown in FIG. 3, when it is determined that Δ T2 is ≦ A and T3> C for M consecutive minutes, the multi-split air conditioner in different operation modes is controlled; when the delta T2 is determined to be less than or equal to A and the T3 is determined to be less than or equal to D (a sixth preset temperature threshold value) continuously for M minutes, the normal range is determined, and the multi-split air-fuel ratio is not specially controlled.
In addition, in the operation process of the multi-split system, when delta T2 is not more than A and D is more than T3 and not more than C, the transition control area is executed according to the control before the control is entered, if delta T2 is not more than A and T3 is more than C, delta T2 is not more than A and D is not more than T3, or delta T2 is not more than A and T3 is more than C, and similarly, if delta T2 is not more than A and T3 is not more than D, delta T2 is not more than A and D is not more than T3 and not more than C, or delta T2 is not more than A and T3 is not more than D.
The value range of the second preset temperature threshold value C is 75-85 ℃, the preferred value range is 80 ℃, and the judgment accuracy is ensured because the reliability of the power module board 5 is not influenced, the second preset temperature threshold value which is too small cannot be selected, otherwise, the judgment is mistaken; in order to ensure timeliness of special control over the multi-split air conditioning system in different operation modes, a second preset temperature threshold which is too large cannot be selected, otherwise, the refrigerant quantity control is seriously unreasonable. The value range of the sixth preset temperature threshold D is 70-80 ℃, preferably 75 ℃, and the value standard of the sixth preset temperature threshold D is similar to that of the second preset temperature threshold C, which is not described herein again.
In addition, the value range of the first preset time M is 3-5 minutes, preferably 5 minutes, and the temperature of the coil, the temperature of the refrigerant cooling plate and the temperature of the power module plate are changed in real time when the multi-split air conditioning system operates, so that in order to avoid misjudgment, the conditions are required to be met continuously for a period of time, and the multi-split air conditioning system under different operation modes can be determined to be controlled. In order to ensure the accuracy of judgment, the first preset time which is too short cannot be selected, otherwise misjudgment is carried out, so that the condition is obtained within a long time (for example, 5 minutes) to judge, and the fault problem is more accurately confirmed.
In this embodiment, in the multi-split air-conditioning unit, since the temperature of the coil, the temperature of the refrigerant cooling plate, and the temperature of the power module plate are changed in real time during the operation of the multi-split air-conditioning unit, in order to avoid misjudgment, it is necessary to determine that the multi-split air-conditioning unit under different operation modes is specially controlled according to the fact that the difference between the temperature of the power module plate and the temperature of the refrigerant cooling plate is less than or equal to the first preset temperature threshold value within a continuous period of time, and when the temperature of the power module plate is greater than the second preset temperature threshold value, so that the refrigerant quantity control of the multi-split air-conditioning unit can meet the requirement, the operation effect of the multi.
Optionally, as shown in fig. 3, the performing special control on the multi-split air conditioner in different operation modes includes:
when the operation mode is a refrigeration mode, correcting the target superheat degree of the difference value between the evaporator outlet pipe temperature and the evaporator inlet pipe temperature at intervals of second preset time until the special control is exited when the exhaust temperature, the high pressure or the low pressure meet preset conditions;
and when the operation mode is a heating mode, adjusting the opening degree of the electronic expansion valve of the outdoor unit at intervals of second preset time until the exhaust temperature, high pressure or low pressure meet preset conditions, and quitting the special control.
The second preset time is defined as L, the evaporator outlet pipe temperature is defined as Tout, the evaporator inlet pipe temperature is defined as Tin, and the difference between the evaporator outlet pipe temperature and the evaporator inlet pipe temperature is defined as the superheat degree Δ T3 of the evaporator, and Δ T3 is Tout-Tin.
Specifically, in the multi-split system, since the lengths of the refrigerant tubes are different between the indoor unit and the outdoor unit, and thus, the refrigerant experiences different flow resistances, the degree of superheat Δ T3 of the evaporator is different. Theoretically, the degree of superheat means the difference between the temperature of superheated steam and the temperature of saturated steam. In practice, the difference between the evaporator outlet pipe temperature Tout and the evaporator inlet pipe temperature Tin is commonly referred to as superheat and is used to control superheat. The multi-split air conditioner system under the refrigeration mode is specially controlled by correcting the superheat degree delta T3 of the evaporator, in order to ensure that the superheat degree of the evaporator meets the corrected value, an internal electronic expansion valve needs to be adjusted, the throttling condition of a refrigerant in the multi-split air conditioner system is controlled, and the opening degree of the internal electronic expansion valve is controlled according to the corrected target superheat degree. Similarly, the multi-split air conditioning system in the heating mode needs to be specially controlled to adjust the electronic expansion valve of the outdoor unit and control the throttling condition of the refrigerant in the multi-split air conditioning system.
In addition, when the multi-split air conditioning system operates in a refrigerating mode, the refrigerant is compressed from the inside of the compressor and is changed into high-pressure gas, high pressure is generated, the refrigerant is changed into liquid after heat exchange with air in the heat exchanger, and low pressure is generated. Since the high pressure is too high or the low pressure is too low when the refrigerant amount of the multi-split air conditioning system is too large, whether to quit the special control can be determined according to whether the high pressure or the low pressure meets the preset condition. The heating operation is similar to the cooling operation, and the details are not described here.
The value range of the second preset time L is 15-30 minutes, preferably 15 minutes, and in the operation process of the compressor, generally, after 10-15 minutes, the operation parameters are basically stable and can be used for reference judgment. Therefore, the smaller second preset time is selected for 15 minutes, so that the operation parameters of the multi-split system are stable, and if the larger second preset time is selected, the waste of the multi-split system resources is caused.
In this embodiment, during the refrigeration operation, the degree of superheat of the evaporator is corrected, so as to adjust the opening of the electronic expansion valve of the indoor unit, control the throttling condition of the refrigerant in the multi-split system, and reasonably control the amount of the refrigerant, so that the multi-split system meets the current refrigeration requirement of a user, and the operation effect of the multi-split system is ensured; during heating operation, the throttling condition of the refrigerant in the multi-split system is controlled by adjusting the opening of the electronic expansion valve of the outer unit, and the amount of the refrigerant is reasonably controlled, so that the multi-split system meets the current heating requirement of a user, and the operation effect of the multi-split system is ensured.
Optionally, the correcting the target superheat degree of the difference between the evaporator outlet pipe temperature and the evaporator inlet pipe temperature every second preset time includes:
and increasing the target superheat degree by a preset superheat value every second preset time until the sum of the increased preset superheat values reaches a preset superheat threshold value.
It should be noted that the preset superheat value and the preset superheat threshold value are constants, the preset superheat value is 2 ℃, and the preset superheat threshold value is 4 ℃.
Specifically, if the difference Δ T3 (target superheat degree) between the initially controlled outlet pipe temperature Tout of the evaporator and the inlet pipe temperature of the evaporator is 2 ℃, and if the condition is obtained to be satisfied, the corrected target superheat degree Δ T3 is 4 ℃ (2 ℃ + preset superheat value 2 ℃ ═ 4 ℃), since the correction is performed once every L minutes, the second corrected target superheat degree Δ T3 is 6 ℃ (4 ℃ + preset superheat value 2 ℃ ═ 6 ℃), and the sum of the two increased preset superheat values (2 ℃ +2 ℃ ═ 4 ℃) is 4 ℃ (preset superheat threshold), the correction of the target superheat degree Δ T3 is stopped.
In the embodiment, the target superheat degree is corrected by increasing the preset superheat value, and then the preset superheat threshold value for limiting the target superheat degree correction is used, so that the condition that the opening degree of the electronic expansion valve of the inner machine is too small or even becomes zero is avoided, the flow of the refrigerant is reasonably controlled, the operation effect of the multi-split system is ensured, the operation state of the multi-split system is always in accordance with the current environment, and the comfort level of a user is improved.
Optionally, the adjusting the opening degree of the outdoor unit electronic expansion valve every second preset time includes:
and reducing the opening degree of the electronic expansion valve of the outdoor unit by a preset opening degree value every second preset time until the sum of the reduced preset opening degree values reaches a preset opening degree threshold value.
It should be noted that the preset opening value and the preset opening threshold are constants, the preset opening value is 10 steps, and the preset opening threshold is 20 steps.
Specifically, if the initially controlled opening degree of the outer machine electronic expansion valve is 30 steps, if the condition is satisfied, the corrected opening degree of the outer machine electronic expansion valve is 20 steps (30 steps — preset opening value 10 steps is 20 steps), and since the correction is performed once every L minutes, the second corrected opening degree of the outer machine electronic expansion valve is 10 steps (20 steps — preset opening value 10 steps is 10 steps), and the sum of the two decreased preset opening values (10 steps +10 steps is 20 steps) is greater than or equal to 20 steps (preset opening threshold), the adjustment of the opening degree of the outer machine electronic expansion valve is stopped.
In this embodiment, the preset opening value is reduced by the opening of the external machine electronic expansion valve, so that the opening of the external machine electronic expansion valve is adjusted, and then the preset opening threshold value limiting the opening of the external machine electronic expansion valve is used for preventing the opening of the external machine electronic expansion valve from being too small or even becoming zero, so that the amount of the refrigerant is reasonably controlled, the multi-split air-conditioning system has a good operation effect, and the use requirements of users are met.
Optionally, the exiting the special control when the exhaust temperature, the high pressure, or the low pressure satisfies a preset condition includes:
and when the exhaust temperature is higher than a preset exhaust temperature threshold, the saturation temperature corresponding to the high pressure is higher than a preset high pressure saturation temperature threshold, or the saturation temperature corresponding to the low pressure is lower than a preset low pressure saturation temperature threshold, the special control is exited.
Note that the exhaust temperature threshold is defined as G, the high pressure saturation temperature threshold is defined as H, and the low pressure saturation temperature threshold is defined as I.
Specifically, the exhaust temperature can be detected in real time by an exhaust temperature sensor on the exhaust port of the compressor; the high pressure can be detected in real time through a pressure sensor on the exhaust port of the compressor, and after the pressure is detected, the corresponding high pressure saturation temperature can be obtained; the low pressure can be detected in real time through a pressure sensor on a return air port of the compressor, and after the pressure is detected, the corresponding low pressure saturation temperature can be obtained. If the exhaust temperature is larger than or equal to G, the exhaust temperature is considered to be too high; if the high-pressure saturation temperature is larger than or equal to H, the high pressure is considered to be too high; if the low-pressure saturation temperature is less than or equal to I, the low pressure is considered to be too low.
In addition, the value range of the exhaust temperature threshold value G is 90-100 ℃, preferably 95 ℃, so that the reliability of the multi-split refrigerant control method is not influenced, the judgment accuracy is ensured, a too small exhaust temperature threshold value cannot be selected, and otherwise, the judgment is mistaken; in order to ensure the timeliness of the complete machine exiting the special control, an exhaust temperature threshold which is too large cannot be selected, otherwise, the special control process cannot be exited in time. The high pressure saturation temperature threshold H is in the range of 55 ℃ to 58 ℃, preferably 57 ℃. The value of the low pressure saturation temperature threshold value I is in the range of-40 ℃ to-35 ℃, preferably-35 ℃. The value standards of the high-pressure saturation temperature threshold H and the low-pressure saturation temperature threshold I are similar to those of the exhaust temperature threshold G, and are not described in detail here.
In the embodiment, the refrigerant is compressed from the compressor into high-temperature high-pressure gas, and if the exhaust temperature or the high pressure is too high, it can be known that the refrigerant quantity of the multi-split air-conditioning system is too much, the multi-split air-conditioning system quits the special control, so that the operation effect of the multi-split air-conditioning system is not influenced, and the multi-split air-conditioning system is always in an optimal control state; the refrigerant is changed into liquid after exchanging heat with air in the heat exchanger, the refrigerant quantity of the multi-split system can be known to be too much through low pressure, and the multi-split system quits the special control so as to avoid influencing the operation effect of the multi-split system and be in an optimal control state all the time.
Optionally, as shown in fig. 4, the controlling a multi-split refrigerant according to the temperature of the power module plate and the temperature of the refrigerant cooling plate further includes:
and when the difference value between the temperature of the power module board and the temperature of the refrigerant cooling board is larger than a third preset temperature threshold value and the temperature of the power module board is larger than a fourth preset temperature threshold value, generating a first indication signal, wherein the first indication signal is used for indicating that the power module board 5 is not installed in place or the power module board 5 is abnormal.
It should be noted that the difference between the temperature of the power module board and the temperature of the refrigerant cooling board is defined as Δ T2, Δ T2 is T3-T2, the third preset temperature threshold is defined as E, the fourth preset temperature threshold is defined as F, and the indication signal is that the warning lamp flickers or a corresponding fault code is displayed.
Specifically, as shown in fig. 3, when Δ T2 > E and T3> F, a first indication signal for indicating that the power module board 5 is not mounted in place or that the power module board 5 is abnormal is generated; and when the delta T2 is more than E and the T3 is less than or equal to B (a fifth preset temperature threshold), determining that the range belongs to a normal range and the use of a user is not influenced, so that the multi-split system does not perform special control and is executed according to normal control.
Furthermore, when Δ T2 > E and B < T3 < F, which is a transition control interval, the previous control of Δ T2 > E and T3> F is maintained; when the delta T2 is less than or equal to E, the control is a transition control interval, the control execution before the control is performed meets the requirements that delta T2 is more than E and T3 is more than F, and the control is performed according to delta T2 is more than E and T3 is more than F; when E is equal to or more than delta T2 and is larger than A, the previous control is maintained until delta T2 is equal to or less than A and retreats, otherwise, the same is carried out.
The value range of the third preset temperature threshold E is 30-40 ℃, preferably 30 ℃, in order to not affect the reliability of the refrigerant control method of the multi-split air-conditioning system and ensure the accuracy of the judgment, the third preset temperature threshold which is too large cannot be selected, otherwise, it cannot be determined that the power module board 5 is not installed in place or the power module board 5 is abnormal in time, and thus an indication signal is generated to remind a user. The fourth preset temperature threshold F is in the range of 85 ℃ to 95 ℃, preferably 90 ℃. The value range of the fifth preset temperature threshold value B is 80-90 ℃, and the preferred value range is 85 ℃. The value standards of the fifth preset temperature threshold B and the fourth preset temperature threshold F are similar to those of the third preset temperature threshold E, and are not repeated here.
In this embodiment, in the multi-split system, the operating state of the current multi-split system can be obtained through the temperature of the power module board and the temperature of the refrigerant cooling board, and by using the difference between the temperature of the power module board and the temperature of the refrigerant cooling board, it can also be determined that the power module board 5 is not installed in place or the power module board 5 is abnormal, and then an indication signal that a warning light flickers or displays a corresponding fault code is generated, so as to remind a user to actively maintain the multi-split system, and effectively adjust the multi-split system, thereby preventing the refrigerant control of the multi-split system caused by the fact that the power module board 5 is not installed in place or the power module board 5 is abnormal from being unreasonable, and further causing the poor operating effect of the multi-split system and affecting the comfortable experience of the user.
Optionally, as shown in fig. 3, the method for controlling a multi-split refrigerant further includes the following steps:
and when the difference between the refrigerant cooling plate temperature and the coil pipe temperature is determined to be greater than or equal to the first preset temperature threshold value continuously for the first preset time and the power module plate temperature is greater than a fifth preset temperature threshold value, generating a second indication signal, wherein the second indication signal is used for indicating that the refrigerant cooling plate 3 and the power module plate 5 are not firmly connected or the refrigerant cooling plate 3 and the power module plate 5 are not connected.
It should be noted that the refrigerant cooling plate temperature is defined as T2, the power module plate temperature is defined as T3, the difference between the power module plate temperature and the refrigerant cooling plate temperature is defined as Δ T2 and Δ T2-T3-T2, the first preset temperature threshold is defined as a, the fifth preset temperature threshold is defined as B, and the indication signal is that a warning lamp flashes or displays a corresponding fault code.
Specifically, as shown in fig. 3, the method for controlling a multi-split refrigerant includes: when obtaining that the delta T1 is more than or equal to A and the T3 is more than B after M minutes, generating a second indicating signal, wherein the second indicating signal is used for indicating that the refrigerant cooling plate 3 and the power module plate 5 are not firmly connected or the refrigerant cooling plate 3 and the power module plate 5 are not connected; when the obtained time delta T1 is more than or equal to A and the obtained time delta T3 is less than or equal to B within M minutes continuously, determining that the obtained time delta T1 is within a normal range, and performing normal control on the multi-split system without special control; and when the delta T1 is less than A, controlling the multi-split refrigerant according to the refrigerant cooling plate temperature and the power module plate temperature.
In this embodiment, in the multi-split system, the current operating state of the multi-split system can be obtained through the temperature of the refrigerant cooling plate and the temperature of the coil, and it is determined that the refrigerant cooling plate 3 is not firmly connected to the power module plate 5 or the refrigerant cooling plate 3 is not connected to the power module plate 5 according to the difference between the temperature of the refrigerant cooling plate and the temperature of the coil, and then an indication signal that a warning lamp flickers or displays a corresponding fault code is generated to remind a user to actively maintain the multi-split system, so that the multi-split system is effectively adjusted, and the problem that the multi-split system is not well controlled by refrigerants due to the fact that the refrigerant cooling plate 3 is not firmly connected to the power module plate 5 or the refrigerant cooling plate 3 is not connected to the power module plate 5 is avoided, so that the operating effect of the multi-split system is poor, and the comfort of the user is affected.
Optionally, before the step of obtaining the coil temperature, the refrigerant cooling plate temperature, and the power module plate temperature, the method further includes the following steps:
and controlling the continuous operation for a third preset time after the startup.
It should be noted that the third preset time is defined as N.
Specifically, the value range of the third preset time N is 15-30 minutes, preferably 15 minutes, and since the compressor is started after the multi-split air conditioning system is started, generally, after 10 to 15 minutes, each operating parameter of the multi-split air conditioning system can be basically stable, so as to be used for reference determination, the multi-split air conditioning system needs to continuously operate for a period of time after being controlled to be started, so that the operating parameters such as the temperature of the coil, the temperature of the refrigerant cooling plate, the temperature of the power module plate, and the like are basically stable. In order to ensure that resources of the multi-split system are not wasted, a third preset time which is too long cannot be selected, otherwise, the resources of the multi-split system are wasted; in order to ensure the accuracy of each operating parameter, a third preset time which is too small cannot be selected, otherwise inaccurate operating parameters can be obtained.
In the embodiment, in the multi-split system, by controlling the continuous operation for a period of time after the multi-split system is started, the acquired coil temperature, the refrigerant cooling plate temperature and the power module plate temperature are more accurate, the reliability that the refrigerant cooling plate 3 and the power module plate 5 are not firmly connected or the refrigerant cooling plate 3 and the power module plate 5 are not connected is determined according to the difference value between the refrigerant cooling plate temperature and the coil temperature acquired in real time in the operation process of the multi-split system, the reliability that the electronic expansion valve is adjusted by using the difference value between the power module plate temperature and the refrigerant cooling plate temperature acquired in real time is ensured, the reliability that the power module plate 5 is not installed in place or the power module plate 5 is abnormal is determined, and further, the generation of an indicating signal of a warning lamp flickering or displaying a corresponding fault code is ensured to remind a user of the reliability of the active maintenance of the multi-split system, therefore, the multi-split air conditioner system is effectively adjusted, the refrigerant quantity is reasonably controlled, the operation effect of the multi-split air conditioner system is ensured, and the comfort requirement of a user is met.
As shown in fig. 4, a multi-split refrigerant control device according to another embodiment of the present invention includes:
the system comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring the temperature of a coil pipe, the temperature of a refrigerant cooling plate and the temperature of a power module plate;
and the processing unit is used for controlling the multi-split refrigerant according to the temperature of the coil pipe, the temperature of the refrigerant cooling plate and the temperature of the power module plate.
It should be noted that the multi-split refrigerant control device is used for implementing the multi-split refrigerant control method, and the multi-split refrigerant control method at least includes all technical solutions of the multi-split refrigerant control method.
It can be understood that, because the multi-split refrigerant control device implements the multi-split refrigerant control method, the multi-split refrigerant control device at least includes all technical solutions of the multi-split refrigerant control method, and therefore at least has all technical effects of the multi-split refrigerant control method, and details are not repeated here.
In another embodiment of the present invention, an air conditioner includes a computer readable storage medium storing a computer program and a processor, and when the computer program is read and executed by the processor, the multi-split refrigerant control method is implemented.
The refrigerant control method of the multi-split air conditioner at least comprises all technical schemes of the refrigerant control method of the multi-split air conditioner.
It can be understood that, since the technical solution of the air conditioner at least includes all technical solutions of the multi-split refrigerant control method, at least all technical effects of the multi-split refrigerant control method are achieved, and details are not repeated here.
Optionally, the air conditioner may be a multi-split air conditioning system, and further includes a coil temperature sensor 2 disposed on the coil 1, a refrigerant cooling plate temperature sensor 4 disposed on the refrigerant cooling plate 3, and a power module plate temperature sensor 6 disposed on the power module plate 5, wherein the coil temperature sensor 2 is configured to collect the coil temperature, the refrigerant cooling plate temperature sensor 4 is configured to collect the refrigerant cooling plate temperature, and the power module plate temperature sensor 6 is configured to collect the power module plate temperature.
The coil temperature is defined as T1, the coolant cooling plate temperature is defined as T2, and the power module plate temperature is defined as T3.
It can be understood that the current operating state of the multi-split system can be obtained according to the coil temperature T1 obtained by the coil temperature sensor 2 arranged on the coil 1 in real time, the refrigerant cooling plate temperature T2 obtained by the refrigerant cooling plate temperature sensor 4 arranged on the refrigerant cooling plate 3 in real time, and the power module plate temperature T3 obtained by the power module plate temperature sensor 6 arranged on the power module plate 5 in real time, so that the multi-split system can be effectively adjusted.
In another embodiment of the present invention, a computer-readable storage medium stores a computer program, and when the computer program is read and executed by a processor, the method for controlling refrigerant of multiple refrigerant lines as described above is implemented.
The refrigerant control method of the multi-split air conditioner at least comprises all technical schemes of the refrigerant control method of the multi-split air conditioner.
It can be understood that, since the technical solution of the computer-readable storage medium at least includes all technical solutions of the multi-split refrigerant control method, at least all technical effects of the multi-split refrigerant control method are achieved, and details are not repeated herein.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (11)

1. A multi-split refrigerant control method is characterized by comprising the following steps:
acquiring the temperature of a coil, the temperature of a refrigerant cooling plate and the temperature of a power module plate;
when the difference value between the temperature of the refrigerant cooling plate and the temperature of the coil pipe is smaller than a first preset temperature threshold value, controlling a multi-split refrigerant according to the temperature of the refrigerant cooling plate and the temperature of the power module plate;
the controlling the multi-split refrigerant according to the refrigerant cooling plate temperature and the power module plate temperature comprises the following steps:
when the difference value between the temperature of the power module plate and the temperature of the refrigerant cooling plate is determined to be smaller than or equal to the first preset temperature threshold value within continuous first preset time, and the temperature of the power module plate is greater than a second preset temperature threshold value, performing special control on the multi-split air conditioner in different operation modes;
the special control of the multi-split air conditioner in different operation modes comprises the following steps:
when the operation mode is a refrigeration mode, correcting the target superheat degree of the difference value between the evaporator outlet pipe temperature and the evaporator inlet pipe temperature at intervals of second preset time until the special control is exited when the exhaust temperature, the high pressure or the low pressure meet preset conditions;
and when the operation mode is a heating mode, adjusting the opening degree of the electronic expansion valve of the outdoor unit at intervals of second preset time until the exhaust temperature, high pressure or low pressure meet preset conditions, and quitting the special control.
2. The multi-split refrigerant control method as claimed in claim 1, wherein the correcting the target superheat degree of the difference between the evaporator outlet pipe temperature and the evaporator inlet pipe temperature every second preset time comprises:
and increasing the target superheat degree by a preset superheat value every second preset time until the sum of the increased preset superheat values reaches a preset superheat threshold value.
3. The multi-split refrigerant control method as claimed in claim 1, wherein the adjusting the opening degree of the outdoor unit electronic expansion valve every second preset time comprises:
and reducing the opening degree of the electronic expansion valve of the outdoor unit by a preset opening degree value every second preset time until the sum of the reduced preset opening degree values reaches a preset opening degree threshold value.
4. The multi-split refrigerant control method as claimed in claim 1, wherein the exiting the special control when the exhaust temperature, the high pressure or the low pressure satisfies a preset condition includes:
and when the exhaust temperature is higher than a preset exhaust temperature threshold, the saturation temperature corresponding to the high pressure is higher than a preset high pressure saturation temperature threshold, or the saturation temperature corresponding to the low pressure is lower than a preset low pressure saturation temperature threshold, the special control is exited.
5. The method for controlling a multi-split refrigerant according to claim 1, wherein the controlling a multi-split refrigerant according to the power module plate temperature and the refrigerant cooling plate temperature further comprises:
and when the difference value between the temperature of the power module board and the temperature of the refrigerant cooling board is larger than a third preset temperature threshold value and the temperature of the power module board is larger than a fourth preset temperature threshold value, generating a first indicating signal, wherein the first indicating signal is used for indicating that the power module board (5) is not installed in place or the power module board (5) is abnormal.
6. The multi-split refrigerant control method as claimed in any one of claims 1 to 5, further comprising the steps of:
and when the difference between the temperature of the refrigerant cooling plate and the temperature of the coil is determined to be greater than or equal to the first preset temperature threshold value continuously for the first preset time and the temperature of the power module plate is greater than a fifth preset temperature threshold value, generating a second indicating signal, wherein the second indicating signal is used for indicating that the refrigerant cooling plate (3) and the power module plate (5) are not firmly connected or the refrigerant cooling plate (3) and the power module plate (5) are not connected.
7. The multi-split refrigerant control method according to claim 6, further comprising, before the step of obtaining the coil temperature, the refrigerant cooling plate temperature, and the power module plate temperature, the steps of:
and controlling the continuous operation for a third preset time after the startup.
8. The utility model provides a many online refrigerant controlling means which characterized in that includes:
the system comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring the temperature of a coil pipe, the temperature of a refrigerant cooling plate and the temperature of a power module plate;
the processing unit is used for controlling the multi-split refrigerant according to the temperature of the coil pipe, the temperature of the refrigerant cooling plate and the temperature of the power module plate;
the processing unit is specifically configured to: when the difference value between the temperature of the power module plate and the temperature of the refrigerant cooling plate is determined to be smaller than or equal to the first preset temperature threshold value within continuous first preset time, and the temperature of the power module plate is greater than a second preset temperature threshold value, performing special control on the multi-split air conditioner in different operation modes; the special control of the multi-split air conditioner in different operation modes comprises the following steps: when the operation mode is a refrigeration mode, correcting the target superheat degree of the difference value between the evaporator outlet pipe temperature and the evaporator inlet pipe temperature at intervals of second preset time until the special control is exited when the exhaust temperature, the high pressure or the low pressure meet preset conditions; and when the operation mode is a heating mode, adjusting the opening degree of the electronic expansion valve of the outdoor unit at intervals of second preset time until the exhaust temperature, high pressure or low pressure meet preset conditions, and quitting the special control.
9. An air conditioner comprising a computer-readable storage medium storing a computer program and a processor, wherein the computer program is read and executed by the processor to implement the multi-split refrigerant control method according to any one of claims 1 to 7.
10. The air conditioner as claimed in claim 9, further comprising a coil temperature sensor (2) disposed on the coil (1), a refrigerant cooling plate temperature sensor (4) disposed on the refrigerant cooling plate (3), and a power module plate temperature sensor (6) disposed on the power module plate (5), wherein the coil temperature sensor (2) is configured to collect a coil temperature, the refrigerant cooling plate temperature sensor (4) is configured to collect a refrigerant cooling plate temperature, and the power module plate temperature sensor (6) is configured to collect a power module plate temperature.
11. A computer-readable storage medium, wherein a computer program is stored, and when the computer program is read and executed by a processor, the method for controlling a multi-split refrigerant according to any one of claims 1 to 7 is implemented.
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