WO2020034516A1 - 控制压缩机切缸的方法、装置及机组、空调系统 - Google Patents

控制压缩机切缸的方法、装置及机组、空调系统 Download PDF

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Publication number
WO2020034516A1
WO2020034516A1 PCT/CN2018/121884 CN2018121884W WO2020034516A1 WO 2020034516 A1 WO2020034516 A1 WO 2020034516A1 CN 2018121884 W CN2018121884 W CN 2018121884W WO 2020034516 A1 WO2020034516 A1 WO 2020034516A1
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Prior art keywords
compressor
cylinder
operating frequency
switched
cutting
Prior art date
Application number
PCT/CN2018/121884
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English (en)
French (fr)
Inventor
刘华
许克
刘群波
李龙飞
戎耀鹏
Original Assignee
珠海格力电器股份有限公司
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Filing date
Publication date
Application filed by 珠海格力电器股份有限公司 filed Critical 珠海格力电器股份有限公司
Priority to US17/259,578 priority Critical patent/US11852132B2/en
Priority to EP18929991.0A priority patent/EP3805656A4/en
Publication of WO2020034516A1 publication Critical patent/WO2020034516A1/zh

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F04B49/065—Control using electricity and making use of computers
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/005—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders with two cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/02—Stopping, starting, unloading or idling control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/001—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids of similar working principle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/02—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids specially adapted for several pumps connected in series or in parallel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/06—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids specially adapted for stopping, starting, idling or no-load operation
    • F04C28/065—Capacity control using a multiplicity of units or pumping capacities, e.g. multiple chambers, individually switchable or controllable
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/08—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by varying the rotational speed
    • 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
    • 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
    • F24F11/88—Electrical aspects, e.g. circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/022—Compressor control arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2203/00—Motor parameters
    • F04B2203/02—Motor parameters of rotating electric motors
    • F04B2203/0204—Frequency of the electric current
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2205/00—Fluid parameters
    • F04B2205/07—Pressure difference over the pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2207/00—External parameters
    • F04B2207/03—External temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2207/00—External parameters
    • F04B2207/70—Warnings
    • F04B2207/703—Stopping
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/07—Electric current
    • F04C2270/075—Controlled or regulated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/09—Electric current frequency
    • F04C2270/095—Controlled or regulated
    • 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
    • F24F2140/10—Pressure
    • F24F2140/12—Heat-exchange fluid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F25B2700/193—Pressures of the compressor
    • F25B2700/1931—Discharge pressures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F25B2700/193—Pressures of the compressor
    • F25B2700/1933—Suction pressures

Definitions

  • the present application relates to the technical field of generating units, and in particular, to a method, a device, a generating unit, and an air-conditioning system for controlling cutting of a compressor by a compressor.
  • the single-double-cylinder switching technology of the compressor has been developed.
  • certain operating parameters of the compressor such as the system pressure difference
  • the fan, electronic expansion valve, different Conditions, and many other factors will cause fluctuations in the system pressure difference, which will affect the normal cutting of the compressor. For example: When the unit is in the ultra-low temperature heating start-up phase (the ambient temperature is extremely low), the system pressure difference is small and the rising speed is slow, and the system pressure difference value required when the compressor is running in two cylinders is not achieved in a short time.
  • the compressor cannot be switched to the double cylinder operation normally, which increases the probability of cylinder failure.
  • the factor of operating frequency will also affect the normal cutting of the compressor. For example, if the compressor is cutting at a high operating frequency, the system pressure will fluctuate sharply due to the change in the volume of the cylinder, which will trigger an abnormal system pressure. protection. The above two situations will cause the compressor to fail to cut the cylinder normally, reducing the reliability of the cutting cylinder, reducing the energy efficiency of the unit, and affecting the user experience.
  • the embodiments of the present application provide a method, a device, and a unit for controlling the cylinder cutting of a compressor, and an air conditioning system, so as to solve the problem of high failure rate of the cylinder cutting of the compressor in the prior art.
  • the present application provides a method for controlling a cylinder cut of a compressor, wherein the method includes:
  • adjusting the current operating frequency according to the system pressure difference includes:
  • determining whether the compressor needs to cut the cylinder includes: determining that the compressor needs to be switched from single-cylinder to dual-cylinder operation, and then determining the target operating frequency according to the system pressure difference includes:
  • determining the target operating frequency f according to the current operating frequency F includes:
  • Pc is the system high pressure
  • Pe is the system low pressure
  • Pc-Pe is the system pressure difference
  • F is the current operating frequency of the compressor
  • f is the target operating frequency of the compressor
  • a, b, c, and k are all Is the preset value.
  • determining that the target operating frequency f is the highest frequency threshold of the compressor includes:
  • the cylinder cutting conditions are:
  • determining whether the compressor needs to switch cylinders includes: determining that the compressor needs to be switched from dual-cylinder to single-cylinder operation, and determining a target operating frequency according to a system pressure difference includes:
  • determining the target operating frequency f according to the current operating frequency F includes:
  • Pc is the system high pressure
  • Pe is the system low pressure
  • Pc-Pe is the system pressure difference
  • F is the current operating frequency of the compressor
  • f is the target operating frequency of the compressor
  • d, e, and p are presets. Value.
  • the cylinder cutting conditions are:
  • controlling the compressor cutting cylinder includes:
  • control target operating frequency does not change.
  • the method further includes:
  • control the unit where the compressor is located If not, control the unit where the compressor is located to stop and report a cylinder cut failure.
  • determining that the compressor needs to be switched from single-cylinder to dual-cylinder operation includes:
  • the current operating frequency of the compressor can be determined based on at least one of the following three factors: the difference between the set temperature value and the ambient temperature value, the set fan speed, and the end of the unit where the compressor is located.
  • the size of the internal machine capacity is determined based on at least one of the following three factors: the difference between the set temperature value and the ambient temperature value, the set fan speed, and the end of the unit where the compressor is located.
  • determining that the compressor needs to be switched from dual-cylinder to single-cylinder operation includes:
  • the current operating frequency of the compressor can be determined based on at least one of the following three factors: the difference between the set temperature value and the ambient temperature value, the set fan speed, and the end of the unit where the compressor is located.
  • the size of the internal machine capacity is determined based on at least one of the following three factors: the difference between the set temperature value and the ambient temperature value, the set fan speed, and the end of the unit where the compressor is located.
  • controlling the compressor cutting cylinder includes:
  • the first solenoid valve can make the exhaust port of the compressor communicate with the variable volume port, and the exhaust port is at a high pressure state; the second solenoid valve can make the suction of the compressor An air port is in communication with the variable-capacity port, and the suction port is in a low-pressure state.
  • an embodiment of the present application provides a unit, wherein the unit is configured to execute the method described in the first aspect, and the unit includes a main controller, a compressor, and a drive control of the compressor.
  • the unit includes a main controller, a compressor, and a drive control of the compressor.
  • the main controller is used to determine whether the compressor needs to cut cylinders; if so, control the drive controller to adjust the current operating frequency according to the system pressure difference so that both the adjusted operating frequency and the system pressure difference meet Cylinder cutting conditions of the compressor; and sending a cylinder cutting instruction to the drive controller;
  • the drive controller is respectively connected to the main controller and the compressor, and is configured to control the compressor to cut the cylinder according to the cylinder cutting instruction.
  • the unit further includes: a high-pressure sensor and a low-pressure sensor respectively connected to the compressor,
  • the high voltage sensor is used to detect the high voltage of the system
  • the low-pressure sensor is used to detect the low-pressure of the system
  • the system pressure difference is the difference between the system high pressure and the system low pressure.
  • main controller is further configured to determine a target operating frequency according to a system pressure difference; and send an operating frequency adjustment instruction to the driving controller;
  • the driving controller is configured to adjust a current operating frequency of the compressor to the target operating frequency according to the operating frequency adjustment instruction.
  • the drive controller is further configured to determine whether the cylinder block of the compressor is successfully switched after controlling the compressor to cut the cylinder; if not, feedback the failure of the cylinder cut to the main controller;
  • the main controller is further configured to control the unit to stop according to the cylinder cutting failure information, and report a cylinder cutting failure.
  • the main controller is further configured to determine that the compressor needs to be switched by a single cylinder if the current required operating frequency of the compressor is greater than the maximum frequency threshold that can be reached when the compressor is operated in a single cylinder To dual-cylinder operation; if the currently required operating frequency of the compressor is less than or equal to the maximum frequency threshold, determining that the compressor needs to be switched from dual-cylinder to single-cylinder operation;
  • the current operating frequency of the compressor can be determined according to at least one of the following three factors: the difference between the set temperature value and the ambient temperature value, the set fan speed, and the internal capacity at the end of the unit size.
  • the main controller is respectively connected to the first solenoid valve and the second solenoid valve, and is also used to control the first solenoid valve to be powered on when the compressor is switched from a single cylinder to a double cylinder, so that The second solenoid valve is powered off, so that the varactor port of the compressor is in a high-pressure state; when the compressor is switched from a double cylinder to a single cylinder, the first solenoid valve is controlled to be powered off, and the second solenoid valve is powered off.
  • the solenoid valve is powered on so that the varactor port of the compressor becomes a low pressure state;
  • the first solenoid valve can make the exhaust port of the compressor communicate with the variable volume port, and the exhaust port is at a high pressure state; the second solenoid valve can make the suction of the compressor An air port is in communication with the variable-capacity port, and the suction port is in a low-pressure state.
  • an embodiment of the present application provides a device for controlling a compressor to cut a cylinder.
  • the device is configured to execute the method described in the second aspect.
  • the device includes:
  • a determination module for determining whether the compressor needs to cut the cylinder
  • An adjustment module configured to adjust the current operating frequency according to the system pressure difference if the compressor needs to cut cylinders, so that both the adjusted operating frequency and the system pressure difference meet the cylinder cutting conditions of the compressor;
  • a control module is used to control the compressor cutting cylinder.
  • the adjustment module is configured to determine a target operating frequency according to a system pressure difference
  • the apparatus further includes:
  • a judging module is configured to determine whether the cylinder block of the compressor is successfully switched after the compressor cuts the cylinder; if not, control the unit where the compressor is located to stop and report the failure of the cylinder cutting.
  • the determining module is further configured to determine that the compressor needs to be switched from a single-cylinder to a single-cylinder if the currently required operating frequency of the compressor is greater than a maximum frequency threshold that can be reached when the single-cylinder operation of the compressor is reached. Double-cylinder operation
  • the current operating frequency of the compressor can be determined based on at least one of the following three factors: the difference between the set temperature value and the ambient temperature value, the set fan speed, and the end of the unit where the compressor is located.
  • the size of the internal machine capacity is determined based on at least one of the following three factors: the difference between the set temperature value and the ambient temperature value, the set fan speed, and the end of the unit where the compressor is located.
  • control module is further configured to control the first solenoid valve to be powered on and the second solenoid valve to be powered off when the compressor is switched from a single-cylinder to a dual-cylinder, so as to make the variable capacity of the compressor It is in a high-pressure state; when the compressor is switched from a dual-cylinder to a single-cylinder, the first solenoid valve is controlled to be powered off, and the second solenoid valve is powered on so that the varactor port of the compressor becomes low-pressure State; wherein the first solenoid valve enables the exhaust port of the compressor to communicate with the variable volume port, and the exhaust port is in a high-pressure state; the second solenoid valve enables the compressor The suction port is connected to the variable volume port, and the suction port is in a low-pressure state.
  • an embodiment of the present application further provides an air conditioning system, where the air conditioning system includes the unit described in the second aspect.
  • the air conditioning system is a variable frequency variable capacity air conditioning system.
  • FIG. 1 is a flowchart of a method for controlling a compressor to cut a cylinder according to an embodiment of the present application
  • FIG. 2 is a flowchart of a method for controlling a compressor to cut a cylinder according to another embodiment of the present application
  • FIG. 3 is a flowchart of a method for controlling a compressor to cut a cylinder according to another embodiment of the present application
  • FIG. 4 is a flowchart of a method of controlling a compressor to cut a cylinder according to another embodiment of the present application
  • FIG. 5 is a structural block diagram of a unit according to an embodiment of the present application.
  • FIG. 6 is a schematic structural diagram of a unit according to another embodiment of the present application.
  • FIG. 7 is a structural block diagram of a device for controlling a compression cutting cylinder according to an embodiment of the present application.
  • An embodiment of the present application provides a method for controlling a cylinder cut of a compressor. The method includes:
  • Step S101 Determine whether the compressor needs to cut the cylinder
  • Step S102 If yes, adjust the current operating frequency according to the system pressure difference, so that both the adjusted operating frequency and the system pressure difference meet the cylinder cutting conditions of the compressor;
  • Step S103 Control the compressor to cut the cylinder.
  • step S101 Determining whether the compressor needs to cut cylinders includes: if the current operating frequency of the compressor is required to be greater than the maximum frequency threshold that can be reached when the compressor operates in a single cylinder, determining whether the compressor needs to be operated by Switch from single-cylinder to double-cylinder operation; if the current operating frequency of the compressor is required to be less than or equal to the maximum frequency threshold, then it is determined that the compressor needs to be switched from dual-cylinder to single-cylinder operation; among them, the current required operating frequency of the compressor can be based on the following three At least one of the factors is determined: the difference between the set temperature value and the ambient temperature value, the set fan speed, and the internal capacity of the end of the unit where the compressor is located.
  • the above implementation method shows that when the user has high requirements for the cooling or heating capacity of the air conditioner, so that the single-cylinder operation of the compressor cannot meet the cooling capacity or heating capacity required by the user, the compressor can double Cylinder operation to increase the cooling or heating capacity of the air conditioner.
  • the unit can determine the position based on the logical algorithm relationship between the above parameters and the compressor operating frequency. The required compressor operating frequency. And determine whether the frequency has exceeded the maximum frequency threshold that the compressor can withstand in single-cylinder operation. If so, control the compressor's dual-cylinder operation to meet the user experience.
  • the increase of the internal capacity (for example, the user turns on the air conditioner in the living room and then turns on the air conditioner in the bedroom) will also increase the requirements for the cooling or heating capacity of the air conditioner.
  • the compressor is controlled to operate in two cylinders.
  • the compressor is controlled to switch from dual-cylinder operation to single-cylinder operation to save energy and avoid unnecessary work while satisfying the user experience.
  • step S102 adjusting the current operating frequency according to the system pressure difference includes:
  • Step S1021 the target operating frequency is determined according to the system pressure difference
  • Step S1022 adjust the current operating frequency to the target operating frequency.
  • step S1021 determining the target operating frequency according to the system pressure difference includes:
  • Pc is the system high pressure
  • Pe is the system low pressure
  • Pc-Pe is the system pressure difference
  • F is the current operating frequency of the compressor
  • f is the target operating frequency of the compressor
  • the current system pressure difference should reach the system required when the compressor can switch to dual-cylinder and maintain dual-cylinder operation. Differential pressure. However, in order to avoid damage to the compressor or increase the operating load of the unit, the system pressure difference should not be too large.
  • the current operating frequency should also reach the operating frequency required when the compressor can switch to two-cylinder and maintain two-cylinder operation. From this, it can be determined that if the compressor needs to be switched from single-cylinder to dual-cylinder operation, the cylinder cutting conditions are: Pc-Pe ⁇ [a, b] and F ⁇ [c-k, c].
  • the value of c is determined in the factory according to the performance of the compressor and the ideal operating conditions. In practical applications, the environment is complex and changeable, and there are errors. In general, when F ⁇ [c-k, c], but not necessarily equal to the value of c, the compressor can be guaranteed to switch to dual-cylinder operation. Therefore, the cylinder cutting conditions are set to Pc-Pe ⁇ [a, b] and F ⁇ [c-k, c]. Here, k may be 10 Hz.
  • the minimum value of c-k should not be lower than the preset proportional value of the highest frequency threshold, and the highest c should not be higher than the preset proportional value of the highest frequency threshold.
  • the value of c-k may be 30% of the highest frequency threshold, and the value of c may be 80% of the highest frequency threshold.
  • the pressure difference of the system can change as the current operating frequency changes. And specifically, the system pressure difference will increase as the current operating frequency increases.
  • the system pressure difference when the system pressure difference is greater than b, it means that the system pressure difference is too large.
  • the reason for the excessive pressure difference in the system may be that the current operating frequency is large.
  • the target operating frequency is set to c, and the actual operating frequency of the compressor is controlled to c, so that the system pressure difference decreases as the frequency decreases. Eventually reduced to [a, b].
  • the actual operating frequency can be adjusted to meet the cylinder cutting condition.
  • the actual operating frequency is greater than c, decrease the actual operating frequency so that the actual operating frequency decreases to c; if the actual operating frequency is less than ck, increase the actual operating frequency so that the actual operating frequency rises to equal to ck; If the actual operating frequency ⁇ [ck, c], it means that the actual operating frequency has met the cylinder cutting conditions, and there is no need to adjust the actual operating frequency.
  • determining that the target operating frequency f is the highest frequency threshold of the compressor includes: during the frequency-up period of adjusting the current operating frequency to the target operating frequency, continuing to determine Pc- Whether Pe satisfies Pc-Pe> b, or whether Pc-Pe ⁇ [a, b]. That is to say, during the frequency-up process, the value of the system pressure difference can be detected in real time or in different periods.
  • the first case or the second case is used.
  • the adjustment method shown in the case continues to adjust the target operating frequency, thereby adjusting the actual operating frequency so that the actual operating frequency reaches the target operating frequency. If the actual operating frequency rises to the maximum frequency threshold and the system pressure difference is still less than a, it means that the unit has failed and cannot be switched to the double cylinder. A fault alarm can be issued to prompt the user for maintenance.
  • Pc is the system high pressure
  • Pe the system low pressure
  • Pc-Pe the system pressure difference
  • F is the current operating frequency of the compressor
  • f compression
  • the target operating frequency of the machine, d, e are preset values. If Pc-Pe ⁇ d, determining the target operating frequency f according to the current operating frequency F includes:
  • the compressor needs to be switched from a two-cylinder to a single-cylinder, it can be understood that the decrease in the system pressure difference is not enough to maintain the compressor's two-cylinder operation.
  • the e value is determined in the plant based on the performance of the compressor and the ideal operating conditions. In practical applications, the environment is complex and changeable, and there are errors.
  • the cylinder cutting conditions are set as: Pc-Pe ⁇ d and F ⁇ [e-p, e]. Among them, e can be 25Hz.
  • the actual operating frequency can be adjusted to a frequency that meets the cylinder cutting conditions.
  • step S103 controlling the cylinder cutting of the compressor includes: Step S1031, during the process of controlling the cylinder cutting of the compressor, the control target operating frequency does not change. Before exiting the cutting cylinder preparation stage, the value of the target operating frequency should be kept constant to prevent misjudgment of the cutting cylinder due to the fluctuation of the reference standard.
  • step S103 after controlling the compressor to cut the cylinder, the method further includes:
  • Step S104 Determine whether the cylinder of the compressor is successfully switched
  • Step S105 If yes, stop cutting the cylinder
  • Step S106 if not, control the unit where the compressor is located to stop, and report a cylinder cutting failure.
  • the main controller sends a cylinder cutting instruction to the drive controller of the compressor.
  • the compressor drive controller controls the compressor to perform cylinder cutting and judges Whether the cylinder of the compressor is switched successfully. If so, the drive controller feeds back the cylinder cutting success message to the main controller.
  • the main controller receives the cylinder cutting success message, it exits the cylinder cutting control action and the unit stops the cylinder cutting. If not, the drive controller feeds back the cylinder cutting failure message to the main controller.
  • the main controller controls the unit to stop and reports the cylinder cutting failure.
  • step S103 controlling the cylinder cutting of the compressor includes: when the compressor is switched from a single cylinder to a double cylinder, controlling the first solenoid valve to be powered on and the second solenoid valve to be powered off, so that the compressor The variable-capacity port of the compressor is in a high-pressure state; when the compressor is switched from a dual-cylinder to a single-cylinder, the first solenoid valve is controlled to be powered off, and the second solenoid valve is powered-on so that the variable-capacity port of the compressor becomes a low-pressure state;
  • the first solenoid valve can communicate the exhaust port of the compressor with the variable volume port, and the exhaust port is at a high pressure state; the second solenoid valve can communicate the suction port of the compressor with the variable volume port, and the suction port is low pressure status.
  • first solenoid valve when the first solenoid valve is powered off, it is determined that the branch where the first solenoid valve is located is open; when the first solenoid valve is powered on, it is determined that the branch where the first solenoid valve is located is a path; when the second solenoid valve is powered off When the power is on, it is determined that the branch where the second solenoid valve is located is an open state; when the second solenoid valve is powered on, it is determined that the branch where the second solenoid valve is located is a path state.
  • the compressor can be controlled to be in a single-cylinder state or a dual-cylinder state by powering on or off the first solenoid valve and the second solenoid valve. It can be understood that the single-double-cylinder compressor is not limited to this structure.
  • FIG. 5 shows a unit according to an embodiment of the present application.
  • the unit is configured to execute the method shown in the foregoing embodiment.
  • the unit includes a main controller 1, a compressor 2, and a drive controller 3 of the compressor 2.
  • the main controller 1 is used to determine whether the compressor 2 needs to cut cylinders; if so, the drive controller 3 is controlled to adjust the current operating frequency according to the system pressure difference so that the adjusted operating frequency and the system pressure difference satisfy the compressor 2 Cylinder cutting conditions; and send a cylinder cutting instruction to the drive controller 3;
  • the drive controller 3 is connected to the main controller 1 and the compressor 2 respectively, and is used to control the compressor 2 to cut the cylinder according to the cylinder cutting command.
  • the two factors that affect the cylinder cutting of compressor 2 can be adjusted first, namely the system pressure difference and the current operating frequency, so that the system pressure difference and the current operating frequency both meet the cylinder cutting conditions of compressor 2, and then control compressor 2 Cut the cylinder.
  • the system pressure difference and operating frequency have been stabilized, which will no longer interfere with the maintenance of the single-cylinder or double-cylinder state of the compressor 2, ensuring the reliable cutting and stable operation of the unit, which indirectly improves the energy efficiency of the unit and improves the user.
  • the system pressure difference and operating frequency have been stabilized, which will no longer interfere with the maintenance of the single-cylinder or double-cylinder state of the compressor 2, ensuring the reliable cutting and stable operation of the unit, which indirectly improves the energy efficiency of the unit and improves the user.
  • the unit further includes: a high-pressure sensor 4 and a low-pressure sensor 5 respectively connected to the compressor 2, and the high-pressure sensor 4 is used to detect the high pressure of the system; and the low-pressure sensor 5 is used to Detection of low system pressure; system pressure difference is the difference between high system pressure and low system pressure.
  • the main controller 1 is further configured to determine that the compressor 2 needs to be switched by a single cylinder if the current required operating frequency of the compressor is greater than the maximum frequency threshold that can be reached when the compressor is operated in a single cylinder. To two-cylinder operation; if the current required operating frequency of the compressor is less than or equal to the maximum frequency threshold, it is determined that the compressor 2 needs to be switched from two-cylinder to single-cylinder operation; among them, the operating frequency of the compressor's current required At least one of the factors is determined: the difference between the set temperature value and the ambient temperature value, the set fan speed, and the internal capacity of the end of the unit.
  • the main controller 1 is further configured to determine a target operating frequency according to a system pressure difference; and sends an operating frequency adjustment instruction to the drive controller 3; the drive controller 3 is used to adjust the instruction according to the operating frequency The current operating frequency of the compressor 2 is adjusted to the target operating frequency.
  • the driving controller 3 is further configured to determine whether the cylinder block of the compressor 2 is successfully switched after controlling the cylinder cutting of the compressor; if yes, feedback the cylinder cutting success information to the main controller 1 ; If not, feedback the cylinder cutting failure information to the main controller 1; the main controller 1 is also used to stop sending the cylinder cutting instruction according to the cylinder cutting success information; control the unit to stop according to the cylinder cutting failure information and report the cylinder cutting failure.
  • the main controller 1 is connected to the first solenoid valve 6 and the second solenoid valve 7, respectively, and is also used to control the first solenoid valve when the compressor 2 is switched from a single cylinder to a double cylinder. 6 is powered on, and the second solenoid valve 7 is powered off, so that the varactor port of the compressor 2 is in a high voltage state; when the compressor 2 is switched from a double cylinder to a single cylinder, the first solenoid valve 6 is controlled to power off, and the second solenoid valve The valve 7 is powered on so that the variable-capacity port of the compressor 2 becomes a low-pressure state; wherein the first solenoid valve 6 enables the exhaust port of the compressor 2 to communicate with the variable-capacity port, and the exhaust port is in a high-pressure state; The two solenoid valves 7 can make the suction port of the compressor 2 communicate with the variable volume port, and the suction port is in a low pressure state.
  • the unit further includes: a gas-liquid separator 8, a four-way valve 9, an electronic expansion valve 10, an outdoor fan (M in the upper right corner of the figure), a small valve 11, a large valve 12, and a small valve 11. It is connected with the electronic expansion valve 10, outdoor fan, four-way valve 9, high-pressure sensor 4, compressor 2, gas-liquid separator 8, low-pressure sensor 5 in sequence, and the low-pressure sensor 5, large valve 12 and four-way valve 9 are respectively connected.
  • FIG. 7 illustrates a device for controlling a compressor to cut a cylinder according to an embodiment of the present application.
  • the device is configured to execute the method shown in the foregoing embodiment.
  • the device includes:
  • An adjustment module 702 configured to adjust the current operating frequency according to the system pressure difference if the compressor needs to cut the cylinder, so that both the adjusted operating frequency and the system pressure difference meet the cylinder cutting conditions of the compressor;
  • a control module 703 is configured to control the compressor to cut the cylinder.
  • the system pressure difference and the current operating frequency can be adjusted so that the system pressure difference and the current operating frequency both meet the cylinder cutting conditions of the compressor, and then the compressor cutting cylinder is controlled.
  • the system pressure difference and operating frequency have stabilized, which will no longer interfere with the compressor's maintenance of single-cylinder or double-cylinder conditions, ensuring the reliable cutting and stable operation of the unit, and indirectly improving the energy efficiency of the unit where the compressor is located. Improved user experience.
  • the determination module 701 is further configured to determine that the compressor needs to be switched from a single cylinder to a dual cylinder if the current demanded operating frequency of the compressor is greater than the maximum frequency threshold that can be reached when the compressor operates in a single cylinder. Operation; if the currently required operating frequency of the compressor is less than or equal to the maximum frequency threshold, then it is determined that the compressor needs to be switched from double-cylinder to single-cylinder operation; wherein the currently required operating frequency of the compressor can be based on at least one of the following three factors This kind of determination: the difference between the set temperature value and the ambient temperature value, the set fan speed and the internal capacity of the end of the unit where the compressor is located.
  • the adjustment module 702 is configured to determine a target operating frequency according to a system pressure difference; and adjust a current operating frequency to the target operating frequency.
  • the device further includes: a judging module, configured to determine whether the cylinder block of the compressor is successfully switched after the compressor cuts the cylinder; if yes, stops the cylinder cutting; if not, controls the compressor The unit in question is stopped, and the cylinder failure is notified.
  • a judging module configured to determine whether the cylinder block of the compressor is successfully switched after the compressor cuts the cylinder; if yes, stops the cylinder cutting; if not, controls the compressor The unit in question is stopped, and the cylinder failure is notified.
  • control module 703 is further configured to control the first solenoid valve to be powered on and the second solenoid valve to be powered off when the compressor is switched from a single cylinder to a dual cylinder, so as to make the compressor variable capacity.
  • Port is in a high-pressure state; when the compressor is switched from dual-cylinder to single-cylinder, the first solenoid valve is controlled to be powered off, and the second solenoid valve is powered on, so that the variable-capacity port of the compressor becomes a low-pressure state;
  • the valve can communicate the exhaust port of the compressor with the variable volume port, and the exhaust port is in a high pressure state; the second solenoid valve can communicate the suction port of the compressor and the variable volume port, and the suction port is in a low pressure state.
  • An embodiment of the present application further provides an air conditioning system.
  • the air conditioning system includes the unit shown in FIG. 5 or FIG. 6.
  • the air conditioning system is a variable frequency and variable capacity air conditioning system, and may also be a multi-line system.

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Abstract

一种控制压缩机切缸的方法，该方法包括：确定压缩机是否需要切缸；如果是，则根据系统压差调整当前运行频率，以使得调整后的运行频率和系统压差均满足压缩机的切缸条件；控制压缩机切缸；此时，系统压差和运行频率已经稳定，不会再对压缩机维持单缸或双缸运行状态产生干扰，保障了压缩机所在机组的能效，提高了用户的使用体验。

Description

控制压缩机切缸的方法、装置及机组、空调系统
相关申请
本申请要求2018年08月17日申请的，申请号为201810941575.1，名称为“一种控制压缩机切缸的方法、装置及机组、空调系统”的中国专利申请的优先权，在此将其全文引入作为参考。
技术领域
本申请涉及机组技术领域，具体而言，涉及一种控制压缩机切缸的方法、装置及机组、空调系统。
背景技术
目前，为解决多联机组负荷较低、能效较差的问题，开发了压缩机的单双缸切换技术。在单双缸切换技术中，压缩机的某些工作参数(例如：系统压差)是影响到压缩机正常切缸的关键因素，而在机组的实际运行中，风机、电子膨胀阀、不同工况等众多因素，都会造成系统压差的波动，从而对压缩机的正常切缸造成影响。例如：当机组处于超低温制热启动阶段(环境温度极低)时，系统压差较小且升高速度较慢，短时间内达不到压缩机双缸运行时所需的系统压差值，导致压缩机不能正常切换至双缸运行，增大了切缸失败的概率。且运行频率这一因素也会影响到压缩机的正常切缸，例如：如果压缩机在运行频率较高时切缸，由于缸体的容积发生改变，会导致系统压力急剧波动而触发系统压力异常保护。上述两种情况均会导致压缩机无法正常切缸，降低了切缸的可靠性，降低了机组能效，影响了用户的使用体验。
针对现有技术中压缩机切缸的可靠性较低，失败率较高的的问题，目前尚未提出有效的解决方案。
发明内容
本申请实施例中提供一种控制压缩机切缸的方法、装置及机组、一种空调系统，以解决现有技术中压缩机切缸失败率较高的问题。
为解决上述技术问题，第一方面，本申请提供了一种控制压缩机切缸的方法，其中，所述方法包括：
确定压缩机是否需要切缸；
如果是，则根据系统压差调整当前运行频率，以使得调整后的运行频率和系统压差均满足所述压缩机的切缸条件；
控制所述压缩机切缸。
进一步地，根据系统压差调整当前运行频率包括：
根据系统压差确定目标运行频率；
将当前运行频率调整至所述目标运行频率。
进一步地，确定压缩机是否需要切缸包括：确定所述压缩机需要由单缸切换至双缸运行，则所述根据系统压差确定目标运行频率包括：
若Pc-Pe＞b，则确定目标运行频率f＝c；或；
若Pc-Pe∈[a，b]，则根据当前运行频率F确定所述目标运行频率f；或；
若Pc-Pe＜a，则确定目标运行频率f为所述压缩机的最高频率阈值；
若Pc-Pe∈[a，b]，所述根据当前运行频率F确定所述目标运行频率f，包括：
若F＞c，则确定f＝c；或；
若F＜c-k，则确定f＝c-k；或；
若F∈[c-k，c]，则确定f＝F；
其中，Pc为系统高压、Pe为系统低压，Pc-Pe为系统压差，F为所述压缩机的当前运行频率，f为所述压缩机的目标运行频率，a、b、c、k均为预设的数值。
进一步地，若Pc-Pe＜a，则确定目标运行频率f为所述压缩机的最高频率阈值包括：
在将当前运行频率调整至所述目标运行频率的升频期间，继续判断Pc-Pe是否满足Pc-Pe＞b，或者，是否满足Pc-Pe∈[a，b]。
进一步地，若确定所述压缩机需要由单缸切换至双缸运行，所述切缸条件为：
Pc-Pe∈[a，b]且F∈[c-k，c]。
进一步地，确定压缩机是否需要切缸包括：确定所述压缩机需要由双缸切换至单缸运行，则根据系统压差确定目标运行频率包括：
若Pc-Pe＞d，则确定目标运行频率f＝e；或；
若Pc-Pe≤d，则根据当前运行频率F确定所述目标运行频率f；
其中，若Pc-Pe≤d，所述根据当前运行频率F确定所述目标运行频率f包括：
若F＞e，则确定f＝e；或；
若F＜e-p，则确定f＝e-p；或；
若F∈[e-p，e]，则确定f＝F；
其中，Pc为系统高压、Pe为系统低压，Pc-Pe为系统压差、F为所述压缩机的当前运行频率，f为所述压缩机的目标运行频率，d、e、p为预设的数值。
进一步地，若确定所述压缩机需要由双缸切换至单缸运行，所述切缸条件为：
Pc-Pe≤d且F∈[e-p，e]。
进一步地，控制所述压缩机切缸，包括：
控制所述压缩机切缸的过程中，控制目标运行频率不变。
进一步地，在控制所述压缩机切缸之后，所述方法还包括：
判断所述压缩机的缸体是否切换成功；
如果否，则控制所述压缩机所在的机组停机，且通报切缸故障。
进一步地，确定所述压缩机需要由单缸切换至双缸运行包括：
如果所述压缩机当前需求的运行频率大于所述压缩机单缸运行时所能达到的最大频率阈值，则确定所述压缩机需要由单缸切换至双缸运行；
其中，所述压缩机当前需求的运行频率能够根据以下三种因素中的至少一种确定：设定温度值与环境温度值的差值、设定风机档位以及所述压缩机所在的机组末端的内机容量大小。
进一步地，确定所述压缩机需要由双缸切换至单缸运行包括：
如果所述压缩机当前需求的运行频率小于或等于所述最大频率阈值，则确定所述压缩机需要由双缸切换至单缸运行；
其中，所述压缩机当前需求的运行频率能够根据以下三种因素中的至少一种确定：设定温度值与环境温度值的差值、设定风机档位以及所述压缩机所在的机组末端的内机容量大小。
进一步地，控制所述压缩机切缸包括：
当所述压缩机由单缸切换至双缸时，控制第一电磁阀上电，第二电磁阀掉电，以使得所述压缩机的变容口为高压状态；
当所述压缩机由双缸切换至单缸时，控制所述第一电磁阀掉电，所述第二电磁阀上电，以使得所述压缩机的变容口变为低压状态；
其中，所述第一电磁阀能够使得所述压缩机的排气口与所述变容口连通，所述排气口处为高压状态；所述第二电磁阀能够使得所述压缩机的吸气口与所述变容口连通，所述吸气口处为低压状态。
第二方面，本申请实施例提供一种机组，其特征在于，所述机组用于执行第一方面所述的方法，所述机组包括：主控制器、压缩机以及所述压缩机的驱动控制器，
所述主控制器，用于确定所述压缩机是否需要切缸；如果是，则控制所述驱动控制器根据系统压差调整当前运行频率，以使得调整后的运行频率和系统压差均满足所述压缩机的切缸条件；并向所述驱动控制器发送切缸指令；
所述驱动控制器，与所述主控制器以及所述压缩机分别连接，用于根据所述切缸指令控制所述压缩机切缸。
进一步地，所述机组还包括：与所述压缩机分别连接的高压传感器以及低压传感器，
所述高压传感器，用于检测系统高压；
所述低压传感器，用于检测系统低压；
所述系统压差为所述系统高压和所述系统低压之差。
进一步地，所述主控制器，还用于根据系统压差确定目标运行频率；并向所述驱动控制器发送运行频率调整指令；
所述驱动控制器，用于根据所述运行频率调整指令将所述压缩机的当前运行频率调整至所述目标运行频率。
进一步地，所述驱动控制器，还用于在控制所述压缩机切缸之后，判断所述压缩机的缸体是否切换成功；如果否，则反馈切缸失败信息至主控制器；
所述主控制器，还用于根据所述切缸失败信息控制所述机组停机，且通报切缸故障。
进一步地，所述主控制器，还用于如果所述压缩机当前需求的运行频率大于所述压缩机单缸运行时所能达到的最大频率阈值，则确定所述压缩机需要由单缸切换至双缸运行；如果所述压缩机当前需求的运行频率小于或等于所述最大频率阈值，则确定所述压缩机需要由双缸切换至单缸运行；
其中，所述压缩机当前需求的运行频率能够根据以下三种因素中的至少一种确定：设定温度值与环境温度值的差值、设定风机档位以及所述机组末端的内机容量大小。
进一步地，所述主控制器，与第一电磁阀和第二电磁阀分别连接，还用于当所述压缩机由单缸切换至双缸时，控制所述第一电磁阀上电，所述第二电磁阀掉电，以使得所述压缩机的变容口为高压状态；当所述压缩机由双缸切换至单缸时，控制所述第一电磁阀掉电，所述第二电磁阀上电，以使得所述压缩机的变容口变为低压状态；
其中，所述第一电磁阀能够使得所述压缩机的排气口与所述变容口连通，所述排气口处为高压状态；所述第二电磁阀能够使得所述压缩机的吸气口与所述变容口连通，所述吸气口处为低压状态。
第三方面，本申请实施例提供一种控制压缩机切缸的装置，所述装置用于执行第二方面所述的方法，所述装置包括：
确定模块，用于确定压缩机是否需要切缸；
调整模块，用于如果所述压缩机需要切缸，则根据系统压差调整当前运行频率，以使得调整后的运行频率和系统压差均满足所述压缩机的切缸条件；
控制模块，用于控制所述压缩机切缸。
进一步地，所述调整模块，用于根据系统压差确定目标运行频率；
将当前运行频率调整至所述目标运行频率。
进一步地，所述装置还包括：
判断模块，用于在所述压缩机切缸之后，判断所述压缩机的缸体是否切换成功；如果否，则控制所述压缩机所在的机组停机，且通报切缸故障。
进一步地，所述确定模块，还用于如果所述压缩机当前需求的运行频率大于所述压缩机单缸运行时所能达到的最大频率阈值，则确定所述压缩机需要由单缸切换至双缸运行；
如果所述压缩机当前需求的运行频率小于或等于所述最大频率阈值，则确定所述压缩机需要由双缸切换至单缸运行；
其中，所述压缩机当前需求的运行频率能够根据以下三种因素中的至少一种确定：设定温度值与环境温度值的差值、设定风机档位以及所述压缩机所在的机组末端的内机容量大小。
进一步地，所述控制模块，还用于当所述压缩机由单缸切换至双缸时，控制第一电磁阀上电，第二电磁阀掉电，以使得所述压缩机的变容口为高压状态；当所述压缩机由双缸切换至单缸时，控制所述第一电磁阀掉电，所述第二电磁阀上电，以使得所述压缩机的变容口变为低压状态；其中，所述第一电磁阀能够使得所述压缩机的排气口与所述变容口连通，所述排气口处为高压状态；所述第二电磁阀能够使得所述压缩机的吸气口与所述变容口连通，所述吸气口处为低压状态。
第四方面，本申请实施例还提供一种空调系统，所述空调系统包括第二方面所述的机组。
进一步地，所述空调系统是变频变容空调系统。
应用本申请的技术方案，首先确定压缩机是否需要切缸；如果是，则根据系统压差调整当前运行频率，以使得调整后的运行频率和系统压差均满足压缩机的切缸条件后，再控制压缩机切缸。由此，可以先调整影响压缩机切缸的两个因素，即系统压差和当前运行频率，使得系统压差和当前运行频率均满足压缩机的切缸条件后，再控制压缩机切缸。此时，系统压差和运行频率已经稳定，不会再对压缩机维持单缸或双缸状态产生干扰，保障了压缩机所在机组的可靠切缸以及稳定运行，间接提高了机组的能效，提高了用户的使用体验。
附图说明
为了更清楚地说明本申请实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据公开的附图获得其他的附图。
图1是本申请一实施例的控制压缩机切缸的方法的流程图；
图2是本申请另一实施例的控制压缩机切缸的方法的流程图；
图3是本申请另一实施例的控制压缩机切缸的方法的流程图；
图4是本申请另一实施例的控制压缩机切缸的方法的流程图；
图5是本申请一实施例的机组的结构框图；
图6是本申请另一实施例的机组的结构示意图；
图7是本申请一实施例的控制压缩切缸的装置的结构框图。
具体实施方式
下面结合附图和具体实施例对本申请作进一步详细描述，应当理解，此处所描述的具体实施例仅仅用以解释本申请，并不用于限定本申请。
在后续的描述中，使用用于表示元件的诸如“模块”、“部件”或“单元”的后缀仅为了有利于本申请的说明，其本身没有特定的意义。因此，“模块”、“部件”或“单元”可以混合地使用。
请参阅图1，为解决现有技术中压缩机切缸的可靠性较低且失败率较高的问题。本申请实施例提供一种控制压缩机切缸的方法，该方法包括：
步骤S101、确定压缩机是否需要切缸；
步骤S102、如果是，则根据系统压差调整当前运行频率，以使得调整后的运行频率和系统压差均满足压缩机的切缸条件；
步骤S103、控制压缩机切缸。
本实施例中，首先确定压缩机是否需要切缸；如果是，则根据系统压差调整当前运行频率，以使得调整后的运行频率和系统压差均满足压缩机的切缸条件后，再控制压缩机切缸。由此，可以先调整影响压缩机切缸的两个因素，即系统压差和当前运行频率，使得系统压差和当前运行频率均满足压缩机的切缸条件后，再控制压缩机切缸。此时，系统压差和运行频率已经稳定，不会再对压缩机维持单缸或双缸状态产生干扰，保障了压缩机所在 机组的可靠切缸以及稳定运行，间接提高了机组的能效，提高了用户的使用体验。
在一种可能的实现方式中，步骤S101、确定压缩机是否需要切缸包括：如果压缩机当前需求的运行频率大于压缩机单缸运行时所能达到的最大频率阈值，则确定压缩机需要由单缸切换至双缸运行；如果压缩机当前需求的运行频率小于或等于最大频率阈值，则确定压缩机需要由双缸切换至单缸运行；其中，压缩机当前需求的运行频率能够根据以下三种因素中的至少一种确定：设定温度值与环境温度值的差值、设定风机档位以及压缩机所在的机组末端的内机容量大小。
以空调为例进行说明，上述实现方式表明，当用户对空调的制冷或制热能力要求较高，以至于压缩机单缸运行无法满足用户需求的制冷量或制热量时，则压缩机可以双缸运行，以提升空调的制冷或制热能力。在一个应用性示例中，如果环境温度值为零下30摄氏度，用户需要开启空调的制热模式时，通过遥控器设定的温度值为18摄氏度，说明设定温度值与环境温度值的差值较大；若此时，用户又将风机档位设定为强档位(表明用户对空调器的制热量要求较高)，则机组可根据上述参数与压缩机运行频率的逻辑算法关系确定所需的压缩机运行频率。并判断该频率是否已经超出压缩机单缸运行时所能承受的最大频率阈值。如果是，则控制压缩机双缸运行，以满足用户的使用体验。另外，在多联机系统中，内机容量增大(例如，用户在开启客厅的空调后，又开启卧室的空调)也会提高对空调制冷或制热能力的要求，则可在单缸运行无法满足时，控制压缩机双缸运行。
同理，如果压缩机单缸运行足以保证用户当前所需的制热量或制冷量，则控制压缩机由双缸运行切换至单缸运行，以在满足用户体验的同时，节约能源，避免做无用功。
在确定压缩机需要切缸后，在切缸准备阶段，也就是未切缸前的阶段，可以对系统压差和运行频率进行调整。基于此，如图2所示，步骤S102、根据系统压差调整当前运行频率包括：
步骤S1021、根据系统压差确定目标运行频率；
步骤S1022、将当前运行频率调整至目标运行频率。
在一个示例中，若确定压缩机由单缸切换至双缸运行，则步骤S1021、根据系统压差确定目标运行频率包括：
若Pc-Pe＞b，则确定目标运行频率f＝c；或；
若Pc-Pe∈[a，b]，则根据当前运行频率F确定目标运行频率f；或；
若Pc-Pe＜a，则确定目标运行频率f为压缩机的最高频率阈值；
其中，Pc为系统高压、Pe为系统低压，Pc-Pe为系统压差，F为压缩机的当前运行频率，f为压缩机的目标运行频率，a、b、c均为预设的数值。若Pc-Pe∈[a，b]，则根据当前 运行频率F确定目标运行频率f，包括：若F＞c，则确定f＝c；或；若F＜c-k，则确定f＝c-k；或；若F∈[c-k，c]，则确定f＝F，k为预设的数值。
下面对上述示例进行简要说明，当确定压缩机需要由单缸切换至双缸运行时，则说明当前的系统压差应达到压缩机能够切换至双缸且维持双缸运行时所需的系统压差。但是，为避免对压缩机造成损坏或加重机组的运行负担，系统压差也不应过大。另一方面，当前运行频率也应达到压缩机能够切换至双缸且维持双缸运行时所需的运行频率。由此，可确定若压缩机需要由单缸切换至双缸运行，切缸条件为：Pc-Pe∈[a，b]且F∈[c-k，c]。
其中，因为c值是在厂内时，根据压缩机的性能以及较为理想的工况确定的。在实际应用中，环境复杂多变，且存在误差。通常情况下，当F∈[c-k，c]，而未必一定要等于c值时，就可以保证压缩机切换至双缸运行。因此，将切缸条件定为Pc-Pe∈[a，b]且F∈[c-k，c]。其中，k可以为10Hz。
其中，为了防止损坏压缩机，c-k的值最低不应低于最高频率阈值的预设比例数值，c最高不应高于最高频率阈值的预设比例数值。例如：c-k的值可以为最高频率阈值的30％，c的值可以为最高频率阈值的80％。
可以理解的是，系统压差能够随着当前运行频率的变化而变化。且具体来说，系统压差会随着当前运行频率的增大而增大。
则第一种情况，当系统压差大于b时，说明系统压差过大。而造成系统压差过大的原因可能是当前的运行频率较大，将目标运行频率定为c，并控制压缩机的实际运行频率降至c，以使得系统压差随频率的降低而降低，最终降低至[a，b]内。
第二种情况，当系统压差∈[a，b]时，说明系统压差满足切缸条件，则将实际运行频率调控至满足切缸条件即可。此时，若实际运行频率大于c，则降低实际运行频率，以至于实际运行频率降至等于c；若实际运行频率小于c-k，则提升实际运行频率，以至于实际运行频率升高至等于c-k；若实际运行频率∈[c-k，c]，则说明实际运行频率已满足切缸条件，不需要对实际运行频率进行调整。
第三种情况，当系统压差小于a时，说明系统压差不满足切缸条件，则将目标运行频率定为压缩机的最高频率阈值，并调整压缩机的实际运行频率直至其达到目标运行频率。在一种可能的实现方式中，若Pc-Pe＜a，则确定目标运行频率f为压缩机的最高频率阈值包括：在将当前运行频率调整至目标运行频率的升频期间，继续判断Pc-Pe是否满足Pc-Pe＞b，或者，是否满足Pc-Pe∈[a，b]。也就是说，在升频过程中，可以实时或分时段检测系统压差的值，如果系统压差的值满足上述第一情况或第二情况所示的条件，则按照第一情况或第二情况中所示的调整方式继续调整目标运行频率，从而调整实际运行频率，以使 得实际运行频率达到目标运行频率。如果实际运行频率升高至最高频率阈值时，系统压差仍然小于a，则说明机组出现故障，无法切换至双缸，可进行故障报警，以提示用户进行维修。
在另一个示例中，当确定压缩机需要由双缸切换至单缸运行，则根据系统压差确定目标运行频率包括：若Pc-Pe＞d，则确定目标运行频率f＝e；或；若Pc-Pe≤d，则根据当前运行频率F确定目标运行频率f；其中，Pc为系统高压、Pe为系统低压，Pc-Pe为系统压差、F为压缩机的当前运行频率，f为压缩机的目标运行频率，d、e为预设的数值。若Pc-Pe≤d，则根据当前运行频率F确定目标运行频率f包括：
若F＞e，则确定f＝e；或；若F＜e-p，则确定f＝e-p；或；若F∈[e-p，e]，则确定f＝F；其中，p为预设的数值。其中，确定压缩机需要由双缸切换至单缸运行，切缸条件为：Pc-Pe≤d且F∈[e-p，e]。
需要说明的是，压缩机需要由双缸切换至单缸时，可以理解为系统压差降低，已经不足以维持压缩机双缸运行。e值是在厂内时，根据压缩机的性能以及较为理想的工况确定的。在实际应用中，环境复杂多变，且存在误差。通常情况下，当F∈[e-p，e]，而未必一定要等于e值时，就可以保证压缩机切换至单缸运行。因此，将切缸条件定为：Pc-Pe≤d且F∈[e-p，e]。其中，e可以为25Hz。
下面对上述示例进行简要说明。第一种情况，当系统压差大于d时，说明系统压差较大，导致这一情况的原因可能是压缩机当前的实际运行频率较大，可确定目标运行频率为e，并将实际运行频率降低至等于e，以保证系统压差不大于d。
第二种情况，当系统压差小于或等于d时，说明系统压差满足切缸条件，此时，将实际运行频率调整至符合切缸条件的频率即可。
在一种可能的实现方式中，如图3所示，步骤S103、控制压缩机切缸包括：步骤S1031、控制压缩机切缸的过程中，控制目标运行频率不变。在未退出切缸准备阶段前，目标运行频率的值应保持不变，以防止由于参考标准的变化波动而导致切缸误判断。
在一种可能的实现方式中，如图4所示，在步骤S103、在控制压缩机切缸之后，方法还包括：
步骤S104、判断压缩机的缸体是否切换成功；
步骤S105、如果是，则停止切缸；
步骤S106、如果否，则控制压缩机所在的机组停机，且通报切缸故障。
下面从硬件的角度对上述实现方式进行说明，主控制器发送切缸指令至压缩机的驱动控制器，压缩机的驱动控制器在接收到切缸指令之后，控制压缩机进行切缸，并判断压缩 机的缸体是否切换成功。如果是，则驱动控制器反馈切缸成功信息至主控制器，主控制器接收到切缸成功信息后，退出切缸控制动作，机组停止切缸。如果否，则驱动控制器反馈切缸失败信息至主控制器，主控制器控制机组停机，并通报切缸故障。
由此，可以保证机组在出现切缸故障时，得到及时的维修，以避免进一步的损坏。
在一种可能的实现方式中，步骤S103、控制压缩机切缸包括：当压缩机由单缸切换至双缸时，控制第一电磁阀上电，第二电磁阀掉电，以使得压缩机的变容口为高压状态；当压缩机由双缸切换至单缸时，控制第一电磁阀掉电，第二电磁阀上电，以使得压缩机的变容口变为低压状态；其中，第一电磁阀能够使得压缩机的排气口与变容口连通，排气口处为高压状态；第二电磁阀能够使得压缩机的吸气口与变容口连通，吸气口处为低压状态。
其中，当第一电磁阀掉电时，确定第一电磁阀所在支路为开路状态；当第一电磁阀上电时，确定第一电磁阀所在支路为通路状态；当第二电磁阀掉电时，确定第二电磁阀所在支路为开路状态；当第二电磁阀上电时，确定第二电磁阀所在支路为通路状态。
可通过第一电磁阀和第二电磁阀的上电或掉电来控制压缩机处于单缸状态还是双缸状态。可以理解的是，单双缸压缩机并不限于此种结构。
图5示出了根据本申请实施例的一种机组，机组用于执行上述实施例所示的方法，机组包括：主控制器1、压缩机2以及压缩机2的驱动控制器3，
主控制器1，用于确定压缩机2是否需要切缸；如果是，则控制驱动控制器3根据系统压差调整当前运行频率，以使得调整后的运行频率和系统压差均满足压缩机2的切缸条件；并向驱动控制器3发送切缸指令；
驱动控制器3，与主控制器1以及压缩机2分别连接，用于根据切缸指令控制压缩机2切缸。
由此，可以先调整影响压缩机2切缸的两个因素，即系统压差和当前运行频率，使得系统压差和当前运行频率均满足压缩机2的切缸条件后，再控制压缩机2切缸。此时，系统压差和运行频率已经稳定，不会再对压缩机2维持单缸或双缸状态产生干扰，保障了机组的可靠切缸以及稳定运行，间接提高了机组的能效，提高了用户的使用体验。
在一种可能的实现方式中，如图6所示，机组还包括：与压缩机2分别连接的高压传感器4以及低压传感器5，高压传感器4，用于检测系统高压；低压传感器5，用于检测系统低压；系统压差为系统高压和系统低压之差。
在一种可能的实现方式中，主控制器1，还用于如果压缩机当前需求的运行频率大于压缩机单缸运行时所能达到的最大频率阈值，则确定压缩机2需要由单缸切换至双缸运行；如果压缩机当前需求的运行频率小于或等于最大频率阈值，则确定压缩机2需要由双缸切 换至单缸运行；其中，机组当前需求的压缩机运行频率能够根据以下三种因素中的至少一种确定：设定温度值与环境温度值的差值、设定风机档位以及机组末端的内机容量大小。
在一种可能的实现方式中，主控制器1，还用于根据系统压差确定目标运行频率；并向驱动控制器3发送运行频率调整指令；驱动控制器3，用于根据运行频率调整指令将压缩机2的当前运行频率调整至目标运行频率。
在一种可能的实现方式中，驱动控制器3，还用于在控制压缩机切缸之后，判断压缩机2的缸体是否切换成功；如果是，则反馈切缸成功信息至主控制器1；如果否，则反馈切缸失败信息至主控制器1；主控制器1，还用于根据切缸成功信息停止发送切缸指令；根据切缸失败信息控制机组停机，且通报切缸故障。
在一种可能的实现方式中，主控制器1，与第一电磁阀6和第二电磁阀7分别连接，还用于当压缩机2由单缸切换至双缸时，控制第一电磁阀6上电，第二电磁阀7掉电，以使得压缩机2的变容口为高压状态；当压缩机2由双缸切换至单缸时，控制第一电磁阀6掉电，第二电磁阀7上电，以使得压缩机2的变容口变为低压状态；其中，第一电磁阀6能够使得压缩机2的排气口与变容口连通，排气口处为高压状态；第二电磁阀7能够使得压缩机2的吸气口与变容口连通，吸气口处为低压状态。
在一种可能的实现方式中，机组还包括：气液分离器8、四通阀9、电子膨胀阀10、室外风机(图中右上角M)、小阀门11以及大阀门12，小阀门11与电子膨胀阀10、室外风机、四通阀9、高压传感器4、压缩机2、气液分离器8、低压传感器5依次顺序连接，低压传感器5、大阀门12与四通阀9分别连接。
图7示出了根据本申请实施例的一种控制压缩机切缸的装置，装置用于执行上述实施例所示的方法，装置包括：
确定模块701，用于确定压缩机是否需要切缸；
调整模块702，用于如果压缩机需要切缸，则根据系统压差调整当前运行频率，以使得调整后的运行频率和系统压差均满足压缩机的切缸条件；
控制模块703，用于控制压缩机切缸。
由此，可以先调整影响压缩机切缸的两个因素，即系统压差和当前运行频率，使得系统压差和当前运行频率均满足压缩机的切缸条件后，再控制压缩机切缸。此时，系统压差和运行频率已经稳定，不会再对压缩机维持单缸或双缸状态产生干扰，保障了机组的可靠切缸以及稳定运行，间接提高了压缩机所在的机组的能效，提高了用户的使用体验。
在一种可能的实现方式中，确定模块701，还用于如果压缩机当前需求运行频率大于压缩机单缸运行时所能达到的最大频率阈值，则确定压缩机需要由单缸切换至双缸运行； 如果压缩机当前需求的运行频率小于或等于最大频率阈值，则确定压缩机需要由双缸切换至单缸运行；其中，压缩机当前需求的运行频率能够根据以下三种因素中的至少一种确定：设定温度值与环境温度值的差值、设定风机档位以及压缩机所在的机组末端的内机容量大小。
在一种可能的实现方式中，调整模块702，用于根据系统压差确定目标运行频率；将当前运行频率调整至目标运行频率。
在一种可能的实现方式中，装置还包括：判断模块，用于在压缩机切缸之后，判断压缩机的缸体是否切换成功；如果是，则停止切缸；如果否，则控制压缩机所在的机组停机，且通报切缸故障。
在一种可能的实现方式中，控制模块703，还用于当压缩机由单缸切换至双缸时，控制第一电磁阀上电，第二电磁阀掉电，以使得压缩机的变容口为高压状态；当压缩机由双缸切换至单缸时，控制第一电磁阀掉电，第二电磁阀上电，以使得压缩机的变容口变为低压状态；其中，第一电磁阀能够使得压缩机的排气口与变容口连通，排气口处为高压状态；第二电磁阀能够使得压缩机的吸气口与变容口连通，吸气口处为低压状态。
本申请实施例还提供一种空调系统，空调系统包括图5或图6所示的机组。
进一步地，空调系统是变频变容空调系统，还可以是多联机系统。
需要说明的是，在本文中，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者装置不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者装置所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括该要素的过程、方法、物品或者装置中还存在另外的相同要素。
上述本申请实施例序号仅仅为了描述，不代表实施例的优劣。
通过以上的实施方式的描述，本领域的技术人员可以清楚地了解到上述实施例方法可借助软件加必需的通用硬件平台的方式来实现，当然也可以通过硬件，但很多情况下前者是更佳的实施方式。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质(如ROM/RAM、磁碟、光盘)中，包括若干指令用以使得一台移动终端(可以是手机，计算机，服务器，空调器，或者网络设备等)执行本申请各个实施例所述的方法。
上面结合图对本申请的实施例进行了描述，但是本申请并不局限于上述的具体实施方式，上述的具体实施方式仅仅是示意性的，而不是限制性的，本领域的普通技术人员在本申请的启示下，在不脱离本申请宗旨和权利要求所保护的范围情况下，还可做出很多形式， 这些均属于本申请的保护之内。

Claims (21)

  1. 一种控制压缩机切缸的方法，其特征在于，所述方法包括：
    确定压缩机是否需要切缸；
    如果是，则根据系统压差调整当前运行频率，以使得调整后的运行频率和系统压差均满足所述压缩机的切缸条件；
    控制所述压缩机切缸。
  2. 根据权利要求1所述的方法，其特征在于，根据系统压差调整当前运行频率包括：
    根据系统压差确定目标运行频率；
    将当前运行频率调整至所述目标运行频率。
  3. 根据权利要求2所述的方法，其特征在于，确定压缩机是否需要切缸包括：确定所述压缩机需要由单缸切换至双缸运行，
    则所述根据系统压差确定目标运行频率包括：
    若Pc-Pe＞b，则确定目标运行频率f＝c；或；
    若Pc-Pe∈[a，b]，则根据当前运行频率F确定所述目标运行频率f；或；
    若Pc-Pe＜a，则确定目标运行频率f为所述压缩机的最高频率阈值；
    其中，若Pc-Pe∈[a，b]，所述根据当前运行频率F确定所述目标运行频率f，包括：
    若F＞c，则确定f＝c；或；
    若F＜c-k，则确定f＝c-k；或；
    若F∈[c-k，c]，则确定f＝F；
    其中，Pc为系统高压、Pe为系统低压，Pc-Pe为系统压差，F为所述压缩机的当前运行频率，f为所述压缩机的目标运行频率，a、b、c、k均为预设的数值。
  4. 根据权利要求3所述的方法，其特征在于，若Pc-Pe＜a，则确定目标运行频率f为所述压缩机的最高频率阈值包括：
    在将当前运行频率调整至所述目标运行频率的升频期间，继续判断Pc-Pe是否满足Pc-Pe＞b，或者，是否满足Pc-Pe∈[a，b]。
  5. 根据权利要求3所述的方法，其特征在于，若确定所述压缩机需要由单缸切换至双缸运行，所述切缸条件为：
    Pc-Pe∈[a，b]且F∈[c-k，c]。
  6. 根据权利要求2所述的方法，其特征在于，确定压缩机是否需要切缸包括：确定所述压缩机需要由双缸切换至单缸运行，
    则所述根据系统压差确定目标运行频率包括：
    若Pc-Pe＞d，则确定目标运行频率f＝e；或；
    若Pc-Pe≤d，则根据当前运行频率F确定所述目标运行频率f；
    若Pc-Pe≤d，则根据当前运行频率F确定所述目标运行频率f，包括：
    若F＞e，则确定f＝e；或；
    若F＜e-p，则确定f＝e-p；或；
    若F∈[e-p，e]，则确定f＝F；
    其中，Pc为系统高压、Pe为系统低压，Pc-Pe为系统压差、F为所述压缩机的当前运行频率，f为所述压缩机的目标运行频率，d、e、p为预设的数值。
  7. 根据权利要求6所述的方法，其特征在于，若确定所述压缩机需要由双缸切换至单缸运行，所述切缸条件为：
    Pc-Pe≤d且F∈[e-p，e]。
  8. 根据权利要求1所述的方法，其特征在于，控制所述压缩机切缸，包括：
    控制所述压缩机切缸的过程中，控制目标运行频率不变。
  9. 根据权利要求1所述的方法，其特征在于，在控制所述压缩机切缸之后，所述方法还包括：
    判断所述压缩机的缸体是否切换成功；
    如果否，则控制所述压缩机所在的机组停机，且通报切缸故障。
  10. 根据权利要求3所述的方法，其特征在于，
    确定所述压缩机需要由单缸切换至双缸运行包括：
    如果所述压缩机当前需求的运行频率大于所述压缩机单缸运行时所能达到的最大频率阈值，则确定所述压缩机需要由单缸切换至双缸运行；
    其中，所述压缩机当前需求的运行频率能够根据以下三种因素中的至少一种确定：设定温度值与环境温度值的差值、设定风机档位以及所述压缩机所在的机组末端的内机容量大小。
  11. 根据权利要求6所述的方法，其特征在于，
    确定所述压缩机需要由双缸切换至单缸运行包括：
    如果所述压缩机当前需求的运行频率小于或等于所述最大频率阈值，则确定所述压缩机需要由双缸切换至单缸运行；
    其中，所述压缩机当前需求的运行频率能够根据以下三种因素中的至少一种确定：设定温度值与环境温度值的差值、设定风机档位以及所述压缩机所在的机组末端的内机容量 大小。
  12. 根据权利要求1-11中任意一项所述的方法，其特征在于，控制所述压缩机切缸包括：
    当所述压缩机由单缸切换至双缸时，控制第一电磁阀上电，第二电磁阀掉电，以使得所述压缩机的变容口为高压状态；
    当所述压缩机由双缸切换至单缸时，控制所述第一电磁阀掉电，所述第二电磁阀上电，以使得所述压缩机的变容口变为低压状态；
    其中，所述第一电磁阀能够使得所述压缩机的排气口与所述变容口连通，所述排气口处为高压状态；所述第二电磁阀能够使得所述压缩机的吸气口与所述变容口连通，所述吸气口处为低压状态。
  13. 一种机组，其特征在于，所述机组用于执行根据权利要求1-12中任意一项所述的方法，所述机组包括：主控制器、压缩机以及所述压缩机的驱动控制器，
    所述主控制器，用于确定所述压缩机是否需要切缸；如果是，则控制所述驱动控制器根据系统压差调整当前运行频率，以使得调整后的运行频率和系统压差均满足所述压缩机的切缸条件；并向所述驱动控制器发送切缸指令；
    所述驱动控制器，与所述主控制器以及所述压缩机分别连接，用于根据所述切缸指令控制所述压缩机切缸。
  14. 根据权利要求13所述的机组，其特征在于，
    所述驱动控制器，还用于在控制所述压缩机切缸之后，判断所述压缩机的缸体是否切换成功；如果否，则反馈切缸失败信息至主控制器；
    所述主控制器，还用于根据所述切缸失败信息控制所述机组停机，且通报切缸故障。
  15. 根据权利要求13中任意一项所述的机组，其特征在于，
    所述主控制器，还用于如果所述压缩机当前需求的运行频率大于所述压缩机单缸运行时所能达到的最大频率阈值，则确定所述压缩机需要由单缸切换至双缸运行；如果所述压缩机当前需求的运行频率小于或等于所述最大频率阈值，则确定所述压缩机需要由双缸切换至单缸运行；
    其中，所述压缩机当前需求的运行频率能够根据以下三种因素中的至少一种确定：设定温度值与环境温度值的差值、设定风机档位以及所述机组末端的内机容量大小。
  16. 根据权利要求13-15中任意一项所述的机组，其特征在于，
    所述主控制器，与第一电磁阀和第二电磁阀分别连接，还用于当所述压缩机由单缸切换至双缸时，控制所述第一电磁阀上电，所述第二电磁阀掉电，以使得所述压缩机的变容 口为高压状态；当所述压缩机由双缸切换至单缸时，控制所述第一电磁阀掉电，所述第二电磁阀上电，以使得所述压缩机的变容口变为低压状态；
    其中，所述第一电磁阀能够使得所述压缩机的排气口与所述变容口连通，所述排气口处为高压状态；所述第二电磁阀能够使得所述压缩机的吸气口与所述变容口连通，所述吸气口处为低压状态。
  17. 一种控制压缩机切缸的装置，其特征在于，所述装置用于执行根据权利要求1-12中任意一项所述的方法，所述装置包括：
    确定模块，用于确定压缩机是否需要切缸；
    调整模块，用于如果所述压缩机需要切缸，则根据系统压差调整当前运行频率，以使得调整后的运行频率和系统压差均满足所述压缩机的切缸条件；
    控制模块，用于控制所述压缩机切缸。
  18. 一种空调系统，其特征在于，所述空调系统包括根据权利要求13-16中任意一项所述的机组。
  19. 根据权利要求18所述的系统，其特征在于，
    所述空调系统是变频变容空调系统。
  20. 一种计算机设备，包括存储器、处理器及存储在存储器上并可在处理器上运行的计算机程序，其特征在于，所述处理器执行所述程序时实现如权利要求1-12中任一项所述的控制压缩机切缸的方法。
  21. 一种包含计算机可执行指令的存储介质，所述计算机可执行指令在由计算机处理器执行时用于执行如权利要求1-12中任一项所述的控制压缩机切缸的方法。
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