CN115388611A - Refrigerator and compressor control method thereof - Google Patents

Refrigerator and compressor control method thereof Download PDF

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Publication number
CN115388611A
CN115388611A CN202211009258.9A CN202211009258A CN115388611A CN 115388611 A CN115388611 A CN 115388611A CN 202211009258 A CN202211009258 A CN 202211009258A CN 115388611 A CN115388611 A CN 115388611A
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CN
China
Prior art keywords
compressor
phase
resistance
starting
refrigerator
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Pending
Application number
CN202211009258.9A
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Chinese (zh)
Inventor
李方
李秀军
张善房
侯同尧
赵强
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Hisense Refrigerator Co Ltd
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Hisense Refrigerator Co Ltd
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Publication date
Application filed by Hisense Refrigerator Co Ltd filed Critical Hisense Refrigerator Co Ltd
Priority to CN202211009258.9A priority Critical patent/CN115388611A/en
Publication of CN115388611A publication Critical patent/CN115388611A/en
Pending legal-status Critical Current

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    • 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D29/00—Arrangement or mounting of control or safety devices
    • F25D29/005—Mounting of control devices
    • 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
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D19/00—Arrangement or mounting of refrigeration units with respect to devices or objects to be refrigerated, e.g. infrared detectors
    • 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D29/00—Arrangement or mounting of control or safety devices
    • F25D29/008—Alarm devices
    • 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
    • F25B2700/15—Power, e.g. by voltage or current
    • 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
    • F25B2700/21—Temperatures
    • F25B2700/2115—Temperatures of a compressor or the drive means therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The invention discloses a refrigerator and a compressor control method thereof, wherein when the compressor is detected to enter a new operation period and a starting instruction is received when the compressor is in an idle state, a three-phase starting resistor of the compressor under a rated voltage is obtained; when the compressor receives a stop instruction in a running state, acquiring a three-phase stop resistor of the compressor under a rated voltage; and calculating the average resistance value of the three-phase starting resistance and the three-phase stopping resistance, and taking the average resistance value as a reference parameter of the compressor in the next operation period. By adopting the embodiment of the invention, the starting and operating parameters of the compressor are set according to the three-phase resistance measured in real time by measuring the three-phase current of the compressor under the specified output voltage, so that the starting success rate and the operating efficiency of the compressor under the severe working conditions are effectively improved.

Description

Refrigerator and compressor control method thereof
Technical Field
The invention relates to the technical field of refrigerators, in particular to a refrigerator and a compressor control method thereof.
Background
The refrigerator compressor frequency conversion controller has the main function of converting electric energy into mechanical energy so as to drive heat exchange between the inside and the outside of the refrigerator, and the refrigerator is provided with control parameters before the compressor is started so as to start the compressor according to the control parameters. However, as the service life of the refrigerator is prolonged, the parameters of the compressor corresponding to the compressor may change due to changes in environment, service conditions, service life, etc., and after the parameters of the compressor in the refrigerator change, if the compressor is still started according to the control parameters of the initial configuration of the refrigerator, the compressor may fail to start.
Disclosure of Invention
The embodiment of the invention aims to provide a refrigerator and a compressor control method thereof, which can effectively improve the starting success rate and the operation efficiency of a compressor.
To achieve the above object, an embodiment of the present invention provides a refrigerator, including:
the compressor is used for compressing the refrigerant flowing through the refrigeration cycle of the refrigerator and providing power for the refrigeration cycle; the compressor is configured with a starting rotating speed according to a preset reference parameter before being started and operates according to the starting rotating speed;
the controller is used for acquiring a three-phase starting resistor of the compressor under rated voltage when the compressor is detected to enter a new operation period and a starting instruction is received when the compressor is in an idle state; when the compressor receives a stop instruction in a running state, acquiring a three-phase stop resistor of the compressor under a rated voltage; and calculating the average resistance value of the three-phase starting resistance and the three-phase stopping resistance, and taking the average resistance value as a reference parameter of the compressor in the next operation period.
As an improvement of the above, the controller is further configured to:
when the compressor receives a starting instruction in an idle state, acquiring three-phase starting current of the compressor under rated voltage, and calculating the three-phase starting resistance according to the three-phase starting current and the rated voltage;
when the compressor receives a stop instruction in a running state, three-phase stop current of the compressor under rated voltage is obtained, and the three-phase stop resistance is calculated according to the three-phase stop current and the rated voltage.
As an improvement of the above, the controller is further configured to:
acquiring a preset reference temperature and a reference resistance value corresponding to the reference temperature;
calculating the real-time temperature of the compressor according to the average resistance value, the reference temperature, the reference resistance value and a preset resistance temperature coefficient;
and when the real-time temperature of the compressor is greater than or equal to a preset temperature threshold value, judging that the compressor is in an abnormal working state.
As an improvement of the scheme, the resistance temperature coefficient is calculated based on three-phase resistance values measured by the motor winding at two different temperatures.
As an improvement of the above, the controller is further configured to:
after the compressor is judged to be in an abnormal working state, the compressor is controlled to stop, and abnormal prompt information is sent out; the prompt information comprises at least one of voice prompt, display screen text prompt, indicator light prompt and remote client prompt.
In order to achieve the above object, an embodiment of the present invention further provides a refrigerator compressor control method, including:
when detecting that a compressor enters a new operation period and receiving a starting instruction when the compressor is in an idle state, acquiring a three-phase starting resistor of the compressor under a rated voltage; the compressor is configured with a starting rotating speed according to a preset reference parameter before being started and operates according to the starting rotating speed;
when the compressor receives a stop instruction in a running state, acquiring a three-phase stop resistor of the compressor under a rated voltage;
and calculating the average resistance value of the three-phase starting resistance and the three-phase stopping resistance, and taking the average resistance value as a reference parameter of the compressor in the next operation period.
As an improvement of the above solution, the obtaining of the three-phase starting resistance of the compressor at the rated voltage includes: acquiring three-phase starting current of the compressor under rated voltage, and calculating the three-phase starting resistance according to the three-phase starting current and the rated voltage;
the method for acquiring the three-phase shutdown resistance of the compressor under the rated voltage comprises the following steps: and acquiring three-phase shutdown current of the compressor under rated voltage, and calculating the three-phase shutdown resistance according to the three-phase shutdown current and the rated voltage.
As an improvement of the above, the refrigerator compressor control method further comprises:
acquiring a preset reference temperature and a reference resistance value corresponding to the reference temperature;
calculating the real-time temperature of the compressor according to the average resistance value, the reference temperature, the reference resistance value and a preset resistance temperature coefficient;
and when the real-time temperature of the compressor is greater than or equal to a preset temperature threshold value, judging that the compressor is in an abnormal working state.
As an improvement of the scheme, the resistance temperature coefficient is calculated based on three-phase resistance values measured by the motor winding at two different temperatures.
As an improvement of the above, the refrigerator compressor control method further comprises:
after the compressor is judged to be in an abnormal working state, the compressor is controlled to stop, and abnormal prompt information is sent out; the prompt information comprises at least one of voice prompt, display screen text prompt, indicator light prompt and remote client prompt.
Compared with the prior art, the refrigerator and the compressor control method thereof disclosed by the embodiment of the invention have the advantages that when the compressor is detected to enter a new operation period and a starting instruction is received when the compressor is in an idle state, the three-phase starting resistance of the compressor under the rated voltage is obtained; when the compressor receives a stop instruction in a running state, acquiring a three-phase stop resistor of the compressor under a rated voltage; and calculating the average resistance value of the three-phase starting resistance and the three-phase stopping resistance, and taking the average resistance value as a reference parameter of the compressor in the next operation period. By adopting the embodiment of the invention, the starting and operating parameters of the compressor are set according to the three-phase resistance measured in real time by measuring the three-phase current of the compressor under the specified output voltage, so that the starting success rate and the operating efficiency of the compressor under the severe working conditions are effectively improved.
Drawings
Fig. 1 is a schematic structural diagram of a refrigerator according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a refrigeration system in a refrigerator according to an embodiment of the present invention;
fig. 3 is a first flowchart of a controller in a refrigerator according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a compressor measuring three-phase resistance before starting according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a compressor measuring three-phase resistance after shutdown according to an embodiment of the present invention;
fig. 6 is a second operation flowchart of the controller in the refrigerator according to the embodiment of the present invention;
fig. 7 is a third flowchart of a controller in a refrigerator according to an embodiment of the present invention;
fig. 8 is a fourth operation flowchart of the controller in the refrigerator according to the embodiment of the present invention;
FIG. 9 is a schematic diagram of information interaction between a refrigerator and a client according to an embodiment of the present invention;
fig. 10 is a flowchart of a method for controlling a compressor of a refrigerator according to an embodiment of the present invention.
100, a refrigerator; 200. a client; 300. a router; 400. a cloud server; 1. a compressor; 2. a condenser; 3. an anti-condensation pipe; 4. drying the filter; 5. a capillary tube; 6. an evaporator; 7. a gas-liquid separator.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in this application will be understood to be a specific case for those of ordinary skill in the art.
Referring to fig. 1, fig. 1 is a perspective view of a refrigerator according to an embodiment of the present application. The refrigerator of the embodiment is approximately in a cuboid shape, and comprises a refrigerator body for limiting a storage space and a plurality of door bodies arranged at an opening of the refrigerator body, wherein each door body comprises a door body shell positioned outside the refrigerator body, a door body liner positioned inside the refrigerator body, an upper end cover, a lower end cover and a heat insulation layer positioned among the door body shell, the door body liner, the upper end cover and the lower end cover; typically, the thermal insulation layer is filled with a foam material. The cabinet is provided with a chamber including a component storage chamber for storing components in the refrigerator, such as a compressor, etc., and a storage space for storing food, etc. The storage space may be partitioned into a plurality of storage chambers, and the storage chambers may be configured as a refrigerating chamber, a freezing chamber, and a temperature-variable chamber according to their uses. One or more door bodies are associated with each storage compartment, for example, in fig. 1, the storage compartment in the upper part is provided with double door bodies. The door body can be pivotally arranged at the opening of the box body and can be opened in a drawer mode so as to achieve drawer type storage.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a refrigeration system in a refrigerator according to an embodiment of the present invention, where the refrigeration system includes a compressor 1, a condenser 2, a condensation preventing pipe 3, a dry filter 4, a capillary tube 5, an evaporator 6, and a gas-liquid separator 7. The working process of the refrigerating system comprises a compression process, a condensation process, a throttling process and an evaporation process.
Wherein, the compression process is as follows: the power line of the refrigerator is plugged, when the contact of the temperature controller is connected, the compressor 1 starts to work, the low-temperature and low-pressure refrigerant is sucked by the compressor 1, and is compressed into high-temperature and high-pressure superheated gas in the cylinder of the compressor 1 and then is discharged into the condenser 2; the condensation process is as follows: the high-temperature and high-pressure refrigerant gas is radiated by the condenser 2, the temperature is continuously reduced, the refrigerant gas is gradually cooled into normal-temperature and high-pressure saturated vapor and further cooled into saturated liquid, the temperature is not reduced any more, the temperature at the moment is called as the condensation temperature, and the pressure of the refrigerant in the whole condensation process is almost unchanged; the throttling process is as follows: the condensed refrigerant saturated liquid flows into the capillary tube 5 after moisture and impurities are filtered by the drying filter 4, throttling and pressure reduction are carried out through the capillary tube, and the refrigerant is changed into normal-temperature low-pressure wet vapor; the evaporation process is as follows: the normal temperature and low pressure wet steam starts to absorb heat for vaporization in the evaporator 6, which not only reduces the temperature of the evaporator and the surrounding, but also changes the refrigerant into low temperature and low pressure gas, the refrigerant from the evaporator 6 returns to the compressor 1 after passing through the gas-liquid separator 7, and the processes are repeated to transfer the heat in the refrigerator to the air outside the refrigerator, thereby realizing the purpose of refrigeration. The fan makes the air constantly get into the fin of evaporimeter 6 carries out the heat exchange, will simultaneously the air that becomes cold after evaporimeter 6 is exothermic sends to through the wind channel in the walk-in with in the freezer, so the continuous circulation of storage room air flows, reaches the purpose of hypothermia.
Specifically, the controller of the refrigerator 100 is configured to: when the compressor is detected to enter a new operation period and a starting instruction is received when the compressor is in an idle state, acquiring a three-phase starting resistor of the compressor under a rated voltage; when the compressor receives a stop instruction in a running state, acquiring a three-phase stop resistor of the compressor under a rated voltage; and calculating the average resistance value of the three-phase starting resistance and the three-phase stopping resistance, and taking the average resistance value as a reference parameter of the compressor in the next operation period.
Exemplarily, referring to fig. 3, fig. 3 is a first flowchart of the operation of the controller in the refrigerator according to the embodiment of the present invention, where the controller is configured to execute steps S11 to S17:
s11, detecting whether the compressor enters a new operation cycle, if so, executing a step S12, and if not, continuing to execute the step S11.
It should be noted that the compressor is stopped when the room temperature reaches the set temperature, and also stopped when defrosting, so that a period of time before the compressor is started up after the compressor is stopped, and a period of time until the compressor is stopped are taken as an operation cycle of the compressor, that is, an operation cycle includes three periods of time: the method comprises a preparation stage before the compressor is started, a compressor running stage and a buffering stage after the compressor is stopped.
S12, when the compressor is detected to enter a new operation period, judging whether a starting instruction is received when the compressor is in an idle state, if so, entering the step S13, and if not, repeatedly executing the step S12.
And S13, if a starting instruction is received, acquiring a three-phase starting resistance of the compressor under the rated voltage.
And S14, controlling the compressor to operate according to the reference parameters set in the previous operation period.
For example, the start instruction should be received at a preparation stage before the compressor is started, referring to fig. 4, fig. 4 is a schematic diagram of the compressor provided by the embodiment of the present invention for measuring three-phase resistances before the compressor is started, after the start instruction is received at time t1, the three-phase start resistance of the motor winding of the compressor is measured once, where the three-phase resistances are a U-phase resistance, a V-phase resistance, and a W-phase resistance, respectively, and then the controller obtains a reference parameter obtained in a last operation cycle of the compressor, configures a start rotation speed of the compressor according to the reference parameter, and operates according to the start rotation speed. The reference parameter is an average resistance value of the motor winding.
S15, judging whether a stop instruction is received when the compressor is in the running state, if so, entering a step S16, and if not, continuing to execute the step S15.
And S16, if a stop instruction is received, acquiring a three-phase stop resistance of the compressor under the rated voltage.
Illustratively, the shutdown command should be received during a buffering period after the compressor is shutdown, referring to fig. 5, fig. 5 is a schematic diagram of the compressor for measuring three-phase resistance after the compressor is shutdown, and after the shutdown command is received at time t2, the three-phase resistance of the motor winding of the compressor is measured again.
And S17, calculating the average resistance value of the three-phase starting resistor and the three-phase stopping resistor, and taking the average resistance value as a reference parameter of the compressor in the next operation period.
Specifically, the controller is further configured to: when the compressor receives a starting instruction in an idle state, acquiring three-phase starting current of the compressor under rated voltage, and calculating the three-phase starting resistance according to the three-phase starting current and the rated voltage; when the compressor receives a stop instruction in a running state, three-phase stop current of the compressor under rated voltage is obtained, and the three-phase stop resistance is calculated according to the three-phase stop current and the rated voltage.
For example, referring to fig. 6, fig. 6 is a second flowchart of the controller in the refrigerator according to the embodiment of the present invention, where step S13 includes steps S131 to S132:
s131, obtaining three-phase starting current of the compressor under rated voltage;
and S132, calculating the three-phase starting resistance according to the three-phase starting current and the rated voltage.
The step S16 includes steps S161 to S162:
s161, obtaining three-phase shutdown current of the compressor under rated voltage;
and S162, calculating the three-phase shutdown resistance according to the three-phase shutdown current and the rated voltage.
For example, on the premise that the rated voltage and the three-phase starting current are known, the three-phase starting resistance, which is the U-phase starting resistance, the V-phase starting resistance and the W-phase starting resistance, can be calculated, and the three-phase stopping resistance, which is the U-phase stopping resistance, the V-phase stopping resistance and the W-phase stopping resistance, can be calculated, and then the average resistance value of the 6 resistance values is calculated.
Specifically, the controller is further configured to: acquiring a preset reference temperature and a reference resistance value corresponding to the reference temperature; calculating the real-time temperature of the compressor according to the average resistance value, the reference temperature, the reference resistance value and a preset resistance temperature coefficient; and when the real-time temperature of the compressor is greater than or equal to a preset temperature threshold value, judging that the compressor is in an abnormal working state.
Exemplarily, referring to fig. 7, fig. 7 is a third flowchart of the controller of the refrigerator according to the embodiment of the present invention, where the controller is further configured to execute steps S18 to S22:
and S18, acquiring a preset reference temperature and a reference resistance value corresponding to the reference temperature, and then entering the step S19.
And S19, calculating the real-time temperature of the compressor according to the average resistance value, the reference temperature, the reference resistance value and a preset resistance temperature coefficient, and then entering the step S20.
And S20, judging whether the real-time temperature of the compressor is greater than or equal to a preset temperature threshold value, if so, entering a step S22, and otherwise, entering a step S21.
S21, when the real-time temperature of the compressor is smaller than a preset temperature threshold value, the compressor is judged to be in a normal working state, and the over-temperature condition does not occur.
S22, when the real-time temperature of the compressor is larger than or equal to a preset temperature threshold value, judging that the compressor is in an abnormal working state, and generating an over-temperature condition.
Illustratively, the calculation formula of the real-time temperature satisfies:
T2＝(R2-R1)/R1*α+T1
wherein T2 is the real-time temperature; t1 is the reference temperature; α is the temperature coefficient of resistance; r1 is the reference resistance value with the unit of omega; and R2 is the average resistance value and has the unit of omega.
Further, the resistance temperature coefficient is calculated based on a three-phase resistance value obtained by measuring the motor winding at two different temperatures. Such as: α = (Rm-Rn)/Rn (t 2-t 1), rn represents a resistance value of a motor winding of the compressor at a temperature of t1, and has a unit of Ω; rm represents the resistance value of the motor winding of the compressor at the temperature t 2.
Further, referring to fig. 8, fig. 8 is a fourth operation flowchart of the controller in the refrigerator according to the embodiment of the present invention, where the controller is further configured to execute step S23:
s23, after judging that the compressor is in an abnormal working state, controlling the compressor to stop and sending abnormal prompt information; the prompt information comprises at least one of voice prompt, display screen text prompt, indicator light prompt and remote client prompt.
Referring to fig. 9, the refrigerator 100 establishes a data connection with the client 200 through a router 300 or a cloud server 400. When the refrigerator 100 and the client 200 communicate with each other through the router 300, the refrigerator 100 and the client 200 are located close to each other, and a user can view an operation situation or a food storage situation of a refrigerator placed in a kitchen in a living room or a room. When the refrigerator 100 and the client 200 communicate with each other through the cloud server 400, the refrigerator 100 and the client 200 are far away from each other, and a user can perform data interaction with the refrigerator 100 through the APP installed in the client 200, and can also realize remote control of the refrigerator 100.
Compared with the prior art, in the refrigerator 100 disclosed in the embodiment of the present invention, when it is detected that the compressor enters a new operation period and a start instruction is received when the compressor is in an idle state, a three-phase start resistance of the compressor under a rated voltage is obtained; when the compressor receives a stop instruction in a running state, acquiring a three-phase stop resistor of the compressor under a rated voltage; and calculating the average resistance value of the three-phase starting resistance and the three-phase stopping resistance, and taking the average resistance value as a reference parameter of the compressor in the next operation period. By adopting the embodiment of the invention, the starting and operating parameters of the compressor are set according to the three-phase resistance measured in real time by measuring the three-phase current of the compressor under the specified output voltage, so that the starting success rate and the operating efficiency of the compressor under the severe working conditions are effectively improved. In addition, the existing software/hardware resources of the compressor variable frequency controller are used for measuring the winding resistance of the refrigerator compressor, the current temperature of the winding of the refrigerator compressor is calculated according to the relation between the resistance and the temperature of the winding material, and the temperature protection function of the refrigerator compressor is realized without adding an additional temperature measuring device and a resistance measuring device.
Referring to fig. 10, fig. 10 is a flowchart of a refrigerator compressor control method implemented by a controller in a refrigerator according to an embodiment of the present invention, and the refrigerator compressor control method includes:
s1, when a compressor is detected to enter a new operation period and a starting instruction is received when the compressor is in an idle state, acquiring a three-phase starting resistor of the compressor under a rated voltage; the compressor is configured with a starting rotating speed according to a preset reference parameter before being started and operates according to the starting rotating speed;
s2, when a stop instruction is received when the compressor is in a running state, a three-phase stop resistor of the compressor under a rated voltage is obtained;
and S3, calculating the average resistance value of the three-phase starting resistor and the three-phase stopping resistor, and taking the average resistance value as a reference parameter of the compressor in the next operation period.
Specifically, the obtaining of the three-phase starting resistance of the compressor at the rated voltage includes: acquiring three-phase starting current of the compressor under rated voltage, and calculating the three-phase starting resistance according to the three-phase starting current and the rated voltage;
the method for acquiring the three-phase shutdown resistance of the compressor under the rated voltage comprises the following steps: and acquiring three-phase shutdown current of the compressor under rated voltage, and calculating the three-phase shutdown resistance according to the three-phase shutdown current and the rated voltage.
It should be noted that the compressor is stopped when the room temperature reaches the set temperature, and also stopped when defrosting, so that a period of time before the compressor is started up after the compressor is stopped, and a period of time until the compressor is stopped are taken as an operation cycle of the compressor, that is, an operation cycle includes three periods of time: the method comprises a preparation stage before the compressor is started, a compressor running stage and a buffering stage after the compressor is stopped. For example, the start instruction should be received at a preparation stage before the compressor is started, after the start instruction is received, a three-phase start resistance of a motor winding of the compressor is measured once, where the three-phase resistance is a U-phase resistance, a V-phase resistance, and a W-phase resistance, and then the controller obtains a reference parameter obtained in a last operation cycle of the compressor, configures a start rotation speed of the compressor according to the reference parameter, and operates the compressor according to the start rotation speed. The reference parameter is an average resistance value of the motor winding. For example, the stop command should be received during a buffer phase after the compressor is stopped, and after receiving the stop command, the three-phase resistance of the motor winding of the compressor is measured once again.
For example, on the premise that the rated voltage and the three-phase starting current are known, the three-phase starting resistance, which is the U-phase starting resistance, the V-phase starting resistance, and the W-phase starting resistance, can be calculated, and the three-phase stopping resistance, which is the U-phase stopping resistance, the V-phase stopping resistance, and the W-phase stopping resistance, can be calculated, and then the average resistance value of the 6 resistance values is calculated.
Specifically, after calculating the average resistance values of the three-phase starting resistance and the three-phase stopping resistance, the refrigerator compressor control method further includes:
acquiring a preset reference temperature and a reference resistance value corresponding to the reference temperature;
calculating the real-time temperature of the compressor according to the average resistance value, the reference temperature, the reference resistance value and a preset resistance temperature coefficient;
and when the real-time temperature of the compressor is greater than or equal to a preset temperature threshold value, judging that the compressor is in an abnormal working state.
Illustratively, the calculation formula of the real-time temperature satisfies:
T2＝(R2-R1)/R1*α+T1
wherein T2 is the real-time temperature; t1 is the reference temperature; α is the temperature coefficient of resistance; r1 is the reference resistance value and has the unit of omega; and R2 is the average resistance value and has the unit of omega.
Further, the resistance temperature coefficient is calculated based on a three-phase resistance value obtained by measuring the motor winding at two different temperatures. Such as: α = (Rm-Rn)/Rn (t 2-t 1), rn represents a resistance value of a motor winding of the compressor at a temperature of t1, and has a unit of Ω; rm represents the resistance value of the motor winding of the compressor at the temperature t 2.
Specifically, the resistance temperature coefficient is calculated based on a three-phase resistance value measured by the motor winding at two different temperatures.
Specifically, the refrigerator compressor control method further includes:
after the compressor is judged to be in an abnormal working state, the compressor is controlled to stop, and abnormal prompt information is sent out; the prompt information comprises at least one of voice prompt, display screen text prompt, indicator light prompt and remote client prompt.
Compared with the prior art, the method for controlling the refrigerator compressor, disclosed by the embodiment of the invention, has the advantages that when the compressor is detected to enter a new operation period and a starting instruction is received when the compressor is in an idle state, the three-phase starting resistance of the compressor under the rated voltage is obtained; when the compressor receives a stop instruction in a running state, acquiring a three-phase stop resistor of the compressor under a rated voltage; and calculating the average resistance value of the three-phase starting resistance and the three-phase stopping resistance, and taking the average resistance value as a reference parameter of the compressor in the next operation period. By adopting the embodiment of the invention, the starting and operating parameters of the compressor are set according to the three-phase resistance measured in real time by measuring the three-phase current of the compressor under the specified output voltage, so that the starting success rate and the operating efficiency of the compressor under the severe working conditions are effectively improved. In addition, the existing software/hardware resources of the compressor variable frequency controller are used for measuring the winding resistance of the refrigerator compressor, the current temperature of the winding of the refrigerator compressor is calculated according to the relation between the resistance and the temperature of the winding material, and the temperature protection function of the refrigerator compressor is realized without adding an additional temperature measuring device and an additional resistance measuring device.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.

Claims (10)

1. A refrigerator, characterized by comprising:
the compressor is used for compressing the refrigerant flowing through the refrigeration cycle of the refrigerator and providing power for the refrigeration cycle; the compressor is configured with a starting rotating speed according to a preset reference parameter before being started, and operates according to the starting rotating speed;
the controller is used for acquiring a three-phase starting resistor of the compressor under rated voltage when the compressor is detected to enter a new operation period and a starting instruction is received when the compressor is in an idle state; when the compressor receives a stop instruction in a running state, acquiring a three-phase stop resistor of the compressor under a rated voltage; and calculating the average resistance value of the three-phase starting resistance and the three-phase stopping resistance, and taking the average resistance value as a reference parameter of the compressor in the next operation period.
2. The refrigerator of claim 1, wherein the controller is further configured to:
when the compressor receives a starting instruction in an idle state, acquiring three-phase starting current of the compressor under rated voltage, and calculating the three-phase starting resistance according to the three-phase starting current and the rated voltage;
when the compressor receives a stop instruction in a running state, three-phase stop current of the compressor under rated voltage is obtained, and the three-phase stop resistance is calculated according to the three-phase stop current and the rated voltage.
3. The refrigerator of claim 1, wherein the controller is further configured to:
acquiring a preset reference temperature and a reference resistance value corresponding to the reference temperature;
calculating the real-time temperature of the compressor according to the average resistance value, the reference temperature, the reference resistance value and a preset resistance temperature coefficient;
and when the real-time temperature of the compressor is greater than or equal to a preset temperature threshold value, judging that the compressor is in an abnormal working state.
4. The refrigerator as claimed in claim 3, wherein the temperature coefficient of resistance is calculated based on three-phase resistance values measured at two different temperatures of the motor winding.
5. The refrigerator of claim 1, wherein the controller is further configured to:
after the compressor is judged to be in an abnormal working state, the compressor is controlled to stop, and abnormal prompt information is sent out; the prompt information comprises at least one of voice prompt, display screen text prompt, indicator light prompt and remote client prompt.
6. A refrigerator compressor control method, comprising:
when detecting that a compressor enters a new operation period and receiving a starting instruction when the compressor is in an idle state, acquiring a three-phase starting resistor of the compressor under a rated voltage; the compressor is configured with a starting rotating speed according to a preset reference parameter before being started, and operates according to the starting rotating speed;
when the compressor receives a stop instruction in a running state, acquiring a three-phase stop resistor of the compressor under a rated voltage;
and calculating the average resistance value of the three-phase starting resistance and the three-phase stopping resistance, and taking the average resistance value as a reference parameter of the compressor in the next operation period.
7. The control method of a compressor of a refrigerator according to claim 6,
the method for acquiring the three-phase starting resistance of the compressor under the rated voltage comprises the following steps: acquiring three-phase starting current of the compressor under rated voltage, and calculating three-phase starting resistance according to the three-phase starting current and the rated voltage;
the method for acquiring the three-phase shutdown resistance of the compressor under the rated voltage comprises the following steps: and acquiring three-phase shutdown current of the compressor under rated voltage, and calculating the three-phase shutdown resistance according to the three-phase shutdown current and the rated voltage.
8. The refrigerator compressor control method as claimed in claim 6, wherein after calculating the average resistance values of the three-phase starting resistance and the three-phase stopping resistance, the refrigerator compressor control method further comprises:
acquiring a preset reference temperature and a reference resistance value corresponding to the reference temperature;
calculating the real-time temperature of the compressor according to the average resistance value, the reference temperature, the reference resistance value and a preset resistance temperature coefficient;
and when the real-time temperature of the compressor is greater than or equal to a preset temperature threshold value, judging that the compressor is in an abnormal working state.
9. The refrigerator compressor control method as claimed in claim 8, wherein the temperature coefficient of resistance is calculated based on three-phase resistance values measured at two different temperatures of the motor winding.
10. The refrigerator compressor control method as claimed in claim 6, further comprising:
after judging that the compressor is in an abnormal working state, controlling the compressor to stop and sending an abnormal prompt message; the prompt information comprises at least one of voice prompt, display screen text prompt, indicator light prompt and remote client prompt.
CN202211009258.9A 2022-08-22 2022-08-22 Refrigerator and compressor control method thereof Pending CN115388611A (en)

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