CN116968512A - Control method, control device and storage medium of refrigerating system - Google Patents

Control method, control device and storage medium of refrigerating system Download PDF

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Publication number
CN116968512A
CN116968512A CN202210426809.5A CN202210426809A CN116968512A CN 116968512 A CN116968512 A CN 116968512A CN 202210426809 A CN202210426809 A CN 202210426809A CN 116968512 A CN116968512 A CN 116968512A
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CN
China
Prior art keywords
compressor
rotational speed
rotation speed
mode
cooling mode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210426809.5A
Other languages
Chinese (zh)
Inventor
陈月
王劲伟
罗皓南
程祚中
朱菲
王星
肖曦
陈石人
曾建力
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WM Smart Mobility Shanghai Co Ltd
Original Assignee
WM Smart Mobility Shanghai Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by WM Smart Mobility Shanghai Co Ltd filed Critical WM Smart Mobility Shanghai Co Ltd
Priority to CN202210426809.5A priority Critical patent/CN116968512A/en
Publication of CN116968512A publication Critical patent/CN116968512A/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/32—Cooling devices
    • B60H1/3204—Cooling devices using compression
    • B60H1/3205—Control means therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00271—HVAC devices specially adapted for particular vehicle parts or components and being connected to the vehicle HVAC unit
    • B60H1/00278—HVAC devices specially adapted for particular vehicle parts or components and being connected to the vehicle HVAC unit for the battery
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00357—Air-conditioning arrangements specially adapted for particular vehicles
    • B60H1/00385—Air-conditioning arrangements specially adapted for particular vehicles for vehicles having an electrical drive, e.g. hybrid or fuel cell
    • B60H1/00392—Air-conditioning arrangements specially adapted for particular vehicles for vehicles having an electrical drive, e.g. hybrid or fuel cell for electric vehicles having only electric drive means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00485—Valves for air-conditioning devices, e.g. thermostatic valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/025—Compressor control by controlling speed
    • F25B2600/0253—Compressor control by controlling speed with variable speed

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • General Engineering & Computer Science (AREA)
  • Air-Conditioning For Vehicles (AREA)

Abstract

The embodiment of the application provides a control method, a control device and a storage medium of a refrigeration system. The control method comprises the following steps: when the need of switching between the single-battery refrigerating mode and the combined refrigerating mode is detected, the rotating speed of the compressor is controlled to be reduced below the first rotating speed within a limiting period, then the passenger cabin stop valve is controlled to act based on the expected refrigerating mode, and after the passenger cabin stop valve is operated, the rotating speed of the compressor is regulated to the rotating speed required by the expected refrigerating mode. The technical problem that the oil quantity of the compressor is unstable when the refrigeration mode is switched can be solved.

Description

Control method, control device and storage medium of refrigerating system
Technical Field
The application relates to the technical field of refrigeration systems, in particular to a control method, a control device and a storage medium of a refrigeration system.
Background
In the fields of electric automobiles and the like, in order to ensure safe and efficient use of the high-temperature climatic automobiles, a refrigerating technology of a power battery is required, and meanwhile, in order to ensure use comfort of users, a passenger cabin is required to be refrigerated at high temperature, so that when the electric automobiles are refrigerated, the electric automobiles are switched between different refrigerating modes according to requirements, the electric automobiles are switched between the single-battery refrigerating mode and the combined refrigerating mode by controlling the switch of a passenger cabin stop valve, the electric automobiles are switched to the single-battery refrigerating mode after the passenger cabin stop valve is closed, and the passenger cabin stop valve is switched to the combined refrigerating mode after the passenger cabin stop valve is opened.
In the prior art, because the rotation speeds of the compressors required by the single-battery refrigeration mode and the combined refrigeration mode are different, when the single-battery refrigeration mode and the combined refrigeration mode are switched, the current rotation speed is directly converted into the target rotation speed required by the refrigeration mode to be switched, but because the rotation speeds of the compressors are both in a higher level in the single-battery refrigeration mode and the combined refrigeration mode, the passenger cabin stop valve is switched under the higher rotation speed, and because a part of oil quantity is carried in the refrigerant for refrigeration, the refrigerant flow speed is higher under the high rotation speed, the stability of the oil quantity in the compressor can be influenced, and the method comprises the following steps: suddenly opening the passenger cabin stop valve to switch to a combined refrigeration mode at a high rotation speed, and rapidly filling the refrigerant to the evaporator to reduce the oil quantity of the compressor; and when the passenger cabin stop valve is closed suddenly at a high rotating speed, the refrigerant flows back to cause oil accumulation of the compressor.
Disclosure of Invention
The application provides a control method, a control device and a storage medium of a refrigeration system aiming at the defects of the prior art, which are used for solving the technical problem that the quantity of the compressor oil is unstable when the refrigeration mode is switched in the prior art.
In a first aspect, an embodiment of the present application provides a control method of a refrigeration system, including:
when the need of switching between the single-battery refrigeration mode and the combined refrigeration mode is detected, controlling the rotation speed of the compressor to be reduced, and determining whether the rotation speed of the compressor is reduced below a first rotation speed within a limiting period; the combined refrigeration mode is used for refrigerating both the battery and the passenger cabin;
if yes, controlling the passenger compartment stop valve to operate based on a desired refrigeration mode;
and after the action of the passenger cabin stop valve is finished, regulating the rotating speed of the compressor to the rotating speed required by the expected refrigeration mode.
Optionally, determining whether the rotational speed of the compressor falls below the first rotational speed within a limit period includes:
determining whether a real-time period between a real-time and a first reduction time of the rotation speed of the compressor exceeds the limit period;
and when the real-time period is not greater than the limit period, determining whether the rotational speed of the compressor is less than a first rotational speed.
Optionally, after determining whether the rotational speed of the compressor is less than the first rotational speed, further comprising:
and when the rotating speed of the compressor is not less than the first rotating speed, continuing to control the rotating speed of the compressor to be reduced until the rotating speed of the compressor is not less than the first rotating speed and the real-time period is greater than the limiting period.
Optionally, controlling the passenger compartment shutoff valve to act based on a desired cooling mode includes: opening the passenger compartment shutoff valve when the desired cooling mode is the combined cooling mode;
and adjusting the rotational speed of the compressor to a rotational speed required for the desired cooling mode after the actuation of the passenger compartment shutoff valve is completed, comprising: and after the passenger cabin stop valve is opened, regulating the rotating speed of the compressor to a first target rotating speed required by the combined refrigeration mode.
Optionally, controlling the passenger compartment shutoff valve to act based on a desired cooling mode includes: closing the passenger compartment shutoff valve when the desired cooling mode is the single cell cooling mode;
and adjusting the rotational speed of the compressor to a rotational speed required for the desired cooling mode after the actuation of the passenger compartment shutoff valve is completed, comprising: and after the passenger cabin stop valve is closed, regulating the rotating speed of the compressor to a second target rotating speed required by the single-cell refrigeration mode.
Optionally, the control method includes at least one of:
the limit period includes not more than 2.5s;
the first rotational speed includes a lowest rotational speed at which the compressor maintains an operating state, and the first rotational speed is less than the first target rotational speed or the second target rotational speed.
Optionally, the period of time taken by the compressor to drop from the real-time rotational speed to below the first rotational speed does not overlap with the period of time taken by the actuation of the passenger compartment shutoff valve.
Optionally, the second target rotational speed required for the single cell cooling mode includes 3500 revolutions per minute, the first target rotational speed required for the combined cooling mode includes 7000 revolutions per minute, and the first rotational speed includes 800 revolutions per minute.
In a second aspect, an embodiment of the present application provides a control apparatus for a refrigeration system, including:
the detection module is used for controlling the rotation speed of the compressor to be reduced when the single-cell refrigeration mode and the combined refrigeration mode are required to be switched, and determining whether the rotation speed of the compressor is reduced below a first rotation speed within a limiting period; the combined refrigeration mode is used for refrigerating both the battery and the passenger cabin;
the control module is used for controlling the passenger cabin stop valve to act based on a desired refrigeration mode if the rotating speed of the compressor is reduced below a first rotating speed within a limiting period;
and the adjusting module is used for adjusting the rotating speed of the compressor to the rotating speed required by the expected refrigeration mode after the action of the passenger cabin stop valve is finished.
In a third aspect, an embodiment of the present application provides a refrigeration system, including: the system comprises a controller, an evaporator, a compressor, a heat exchanger, a passenger cabin stop valve and a passenger cabin air conditioner;
the evaporator, the compressor, the passenger cabin stop valve and the passenger cabin air conditioner are connected through pipelines in sequence and form a first fluid loop; the evaporator, the compressor and the heat exchanger are sequentially connected through pipelines to form a second fluid loop, so that the heat exchanger is close to, contacted with or mechanically connected with a battery;
the controller is electrically connected to both the compressor and the passenger compartment shutoff valve for executing the control method provided by the first aspect of the application.
In a fourth aspect, an embodiment of the present application provides a computer readable storage medium having stored thereon a computer program which, when executed by a refrigeration system, implements the control method provided by the first aspect of the present application.
The technical scheme provided by the embodiment of the application has the beneficial technical effects that:
according to the control method of the refrigerating system, when the single-battery refrigerating mode and the combined refrigerating mode are switched, the rotating speed of the compressor is controlled to be reduced, and then the passenger cabin stop valve is operated, so that the oil quantity of the compressor is not influenced by the operation of the passenger cabin stop valve, and the problem that the oil quantity of the compressor is unstable at high rotating speed is solved. Specifically:
the single-cell refrigerating mode and the combined refrigerating mode are switched, the refrigerating mode is controlled by controlling the opening and closing of the stop valve of the passenger cabin, and after the fact that the refrigerating mode needs to be switched is detected, the rotating speed of the compressor is controlled to be reduced, so that the refrigerant circulation speed for refrigerating is reduced, the flow speed of the refrigerant is lower after the rotating speed is reduced below a first rotating speed, the quantity of oil carried in the refrigerant is also stable, the stop valve of the passenger cabin is operated at the moment, the influence on the flow speed and the quantity stability of the refrigerant is small, and therefore, when the stop valve of the passenger cabin is opened, the quantity of the compressor is not reduced due to the fact that the refrigerant is charged to the evaporator instantly when the flow speed of the refrigerant is too high; and when the passenger cabin stop valve is closed, the refrigerant flows back suddenly due to the fact that the flow speed of the refrigerant is too high, so that the oil of the compressor is more stable, the compressor is protected, and the service time of the compressor is prolonged.
Further, when the rotation speed of the compressor is small, the passenger compartment shutoff valve is operated, and the loss due to friction such as a cylinder wall and the noise due to the passenger compartment operation can be reduced.
Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.
Drawings
The foregoing and/or additional aspects and advantages of the application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
fig. 1 is a schematic structural diagram of a refrigeration system according to an embodiment of the present application;
fig. 2 is a schematic flow chart of a control method of a refrigeration system according to an embodiment of the present application;
fig. 3 is a schematic flow chart of a control method for converting a single-battery cooling mode into a combined cooling mode according to an embodiment of the present application;
fig. 4 is a schematic flow chart of a control method for converting a combined cooling mode into a single-battery cooling mode according to an embodiment of the present application;
fig. 5 is a schematic frame structure of a control device of a refrigeration system according to an embodiment of the present application.
The reference numerals of the drawings are explained as follows:
1-a refrigeration system; a 101-evaporator; 102-a compressor; 103-passenger compartment shutoff valve; 104-passenger cabin air conditioning; 105-heat exchanger; 106-a battery; 107-a controller;
2-control means of the refrigeration system; 201-a detection module; 202-a control module; 203-an adjustment module.
Detailed Description
Embodiments of the present application are described below with reference to the drawings in the present application. It should be understood that the embodiments described below with reference to the drawings are exemplary descriptions for explaining the technical solutions of the embodiments of the present application, and the technical solutions of the embodiments of the present application are not limited.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless expressly stated otherwise, as understood by those skilled in the art. It should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of other features, information, data, steps, operations, elements, components, and/or groups thereof, all of which may be included in the present application. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. The term "and/or" as used herein refers to at least one of the items defined by the term, e.g., "a and/or B" may be implemented as "a", or as "B", or as "a and B".
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the embodiments of the present application will be described in further detail with reference to the accompanying drawings.
The following describes the technical scheme of the present application and how the technical scheme of the present application solves the above technical problems in detail with specific embodiments. It should be noted that the following embodiments may be referred to, or combined with each other, and the description will not be repeated for the same terms, similar features, similar implementation steps, and the like in different embodiments.
An embodiment of the present application provides a refrigeration system 1, as shown in fig. 1, including: a controller 107, an evaporator 101, a compressor 102, a heat exchanger 105, a cabin shut-off valve 103, and a cabin air conditioner 103.
The evaporator 101, the compressor 102, the passenger compartment shutoff valve 103 and the passenger compartment air conditioner 103 are connected in sequence through pipelines and form a first fluid circuit; the evaporator 101, the compressor 102 and the heat exchanger 105 are connected in sequence by piping to form a second fluid circuit such that the heat exchanger 105 is in close proximity, contact or mechanical connection with the battery 106.
The controller 107 is electrically connected to both the compressor 102 and the passenger compartment shutoff valve 103 for performing the control method provided by the present application.
Optionally, the evaporator 101 and the compressor 102 together provide a refrigeration source, and a refrigerant for refrigeration is output, and a part of oil quantity is carried in the refrigerant to flow in the fluid circuit.
Alternatively, the evaporator 101, the compressor 102, the passenger compartment stop valve 103 and the passenger compartment air conditioner 103 are sequentially connected through pipelines to form a fluid circuit for controlling the refrigeration of the passenger compartment, and when the passenger compartment stop valve 103 is opened, the refrigerant returns to the evaporator 101 through the passenger compartment stop valve 103 and the passenger compartment air conditioner 103 to form a passenger compartment refrigeration circuit; when the passenger compartment shutoff valve 103 is closed, passenger compartment cooling also stops.
Optionally, the evaporator 101, the compressor 102 and the heat exchanger 105 are connected through pipes to form a second fluid circuit, the heat exchanger 105 is close to, in contact with or mechanically connected with the battery 106, the battery 106 and the second fluid circuit realize heat exchange through the heat exchanger 105, so as to realize refrigeration of the battery 106, and a valve for controlling a switch is further included between the heat exchanger 105 and the compressor 102, and the valve includes an electronic expansion valve, which is not identified in the figure, but is used for controlling refrigeration of the battery 106, and when the electronic expansion valve is opened, the refrigerant realizes refrigeration of the battery 106 through the heat exchanger 105.
Optionally, under the condition that the electronic expansion valve is opened, the refrigeration system 1 may implement refrigeration on the battery 106, and at this time, if the passenger compartment stop valve 103 is closed, only the battery 106 is implemented in refrigeration mode of single battery, and if at this time, the passenger compartment stop valve 103 is opened, then, combined refrigeration on the battery 106 and the passenger compartment may be implemented simultaneously, and in combination refrigeration mode.
Optionally, the controller 107 is electrically connected to both the compressor 102 and the passenger compartment shutoff valve 103, and for distinguishing from the fluid circuit in the refrigeration system 1, the electrical connection is shown by a dashed line in fig. 1 for controlling the rotation speed of the compressor 102 and the opening and closing of the passenger compartment refrigeration mode, and the controller 107 is also electrically connected to the electronic expansion valve for controlling the opening and closing of the battery 106 refrigeration mode.
Based on the same inventive concept, in matching with the refrigeration system 1 provided by the present application, an embodiment of the present application provides a control method of the refrigeration system 1, where a flow chart of the method is shown in fig. 2, and the method includes steps S201 to S203 as follows:
s201: when the need to switch between the single-battery refrigeration mode and the combined refrigeration mode is detected, controlling the rotation speed of the compressor 102 to be reduced, and determining whether the rotation speed of the compressor 102 is reduced below a first rotation speed within a limiting period; the combined cooling mode is used to cool both the battery 106 and the passenger compartment.
Alternatively, the refrigeration system 1 includes a single-battery cooling mode, a single-cabin cooling mode, and a combined cooling mode, which is a combined cooling mode in which the battery 106 cooling mode and the cabin cooling mode are simultaneously performed.
Optionally, switching between the single cell cooling mode and the combined cooling mode includes transitioning from the single cell cooling mode to the combined cooling mode and from the combined cooling mode to the single cell cooling mode.
In some embodiments, determining whether the rotational speed of the compressor 102 falls below the first rotational speed within the limit period includes:
determining whether a real-time period between the real-time instant and a first reduction instant of the rotational speed of the compressor 102 exceeds a limit period;
when the real-time period is not greater than the limit period, it is determined whether the rotational speed of the compressor 102 is less than the first rotational speed.
Optionally, the reduction of the rotation speed of the compressor 102 is completed in a limited period, so that not only can the efficiency of the switching of the refrigeration modes be improved, but also the compressor 102 can be protected from the loss of the compressor 102 caused by performing a stop valve or other operations at a high rotation speed when the rotation speed is not reduced in time.
In some embodiments, after determining whether the rotational speed of the compressor 102 is less than the first rotational speed, further comprising:
when the rotation speed of the compressor 102 is not less than the first rotation speed, the rotation speed of the compressor 102 is continuously controlled to be reduced until the rotation speed of the compressor 102 is not less than the first rotation speed and the real-time period is greater than the limit period.
Optionally, if the rotation speed of the compressor 102 is not less than the first rotation speed during the limiting period, the rotation speed of the compressor 102 is controlled to be continuously reduced, and if the rotation speed is reduced below the first rotation speed during the limiting period, the next step is performed.
Optionally, after the real-time period is determined to exceed the limit period, the rotation speed of the compressor 102 is still not less than the first rotation speed, and the abnormality is determined to occur, so that the user may be prompted by means of an alarm or the like, and the prompting means is common knowledge in the art and is not described herein.
Alternatively, the limit period includes not more than 2.5 seconds, and those skilled in the art will appreciate that the setting of the limit period is related to factors such as the performance of the compressor 102 and the design of the refrigeration system 1.
S202: it is determined that the rotation speed of the compressor 102 falls below the first rotation speed within the limit period, and the passenger compartment shutoff valve 103 is controlled to operate based on the desired cooling mode.
Optionally, when the single-cell cooling mode is changed into the combined cooling mode, the combined cooling mode is the expected cooling mode; when the combined cooling mode is changed into the single-cell cooling mode, the single-cell cooling mode is the expected cooling mode.
In some embodiments, the period of time it takes for the compressor 102 to drop from the real-time rotational speed below the first rotational speed does not overlap with the period of time it takes for the passenger compartment shutoff valve 103 to operate.
Optionally, after the rotation speed of the compressor 102 drops below the first rotation speed, the passenger cabin stop valve 103 is actuated, so that a problem of VNH (Noise, vibration, harshness and Harshness) can be effectively avoided due to a large Noise generated by switching of the passenger cabin stop valve 103 at a high rotation speed.
S203: after the completion of the operation of the passenger compartment shutoff valve 103, the rotation speed of the compressor 102 is adjusted to the rotation speed required for the desired cooling mode.
In some embodiments, controlling the passenger compartment shutoff valve 103 to act based on the desired cooling mode includes: when the desired cooling mode is the combined cooling mode, the passenger compartment shutoff valve 103 is opened;
and, after the operation of the passenger compartment shutoff valve 103 is completed, adjusting the rotation speed of the compressor 102 to the rotation speed required for the desired cooling mode, including: after the passenger compartment shutoff valve 103 is opened, the rotational speed of the compressor 102 is adjusted to a first target rotational speed required for the combined cooling mode.
Alternatively, when the single-cell cooling mode is changed to the combined cooling mode, after the rotation speed of the compressor 102 is reduced below the first rotation speed, the passenger compartment stop valve 103 is opened, so that the refrigerant flowing at a high speed is prevented from being instantaneously charged into the evaporator 101 when the passenger compartment stop valve 103 is opened at a high rotation speed, and the oil amount of the compressor 102 is reduced.
Optionally, after the passenger compartment stop valve 103 is opened, the rotation speed of the compressor 102 is adjusted to the first target rotation speed, so as to switch the refrigeration mode, and at this time, a refrigeration loop for passenger compartment refrigeration in the combined refrigeration mode is formed, and the oil amount of the compressor 102 can be kept stable.
In some embodiments, controlling the passenger compartment shutoff valve 103 to act based on the desired cooling mode includes: when the desired cooling mode is the single cell cooling mode, the passenger compartment shutoff valve 103 is closed;
and, after the operation of the passenger compartment shutoff valve 103 is completed, adjusting the rotation speed of the compressor 102 to the rotation speed required for the desired cooling mode, including: after the closing of the passenger compartment shutoff valve 103, the rotation speed of the compressor 102 is adjusted to a second target rotation speed required for the single cell cooling mode.
Alternatively, when the combined cooling mode is changed to the single-cell cooling mode, after the rotation speed of the compressor 102 is reduced below the first rotation speed, the passenger compartment stop valve 103 is closed again, so that the refrigerant flowing at a high speed is prevented from instantaneously flowing back when the passenger compartment stop valve 103 is closed at a high rotation speed, and oil accumulation of the compressor 102 is avoided.
Optionally, after the passenger compartment stop valve 103 is closed, the rotation speed of the compressor 102 is adjusted to the second target rotation speed, so as to switch the cooling mode, at this time, the cooling circuit for passenger compartment cooling in the single-cell cooling mode is closed, and the oil amount of the compressor 102 can be kept stable.
Alternatively, the electronic expansion valve controlling the cooling of the battery 106 remains open when switching between the single-cell cooling mode and the combined cooling mode.
In some embodiments, the first rotational speed includes a minimum rotational speed at which the compressor 102 remains in operation, and the first rotational speed is less than the first target rotational speed or the second target rotational speed.
Alternatively, the first rotational speed includes a minimum rotational speed at which the compressor 102 maintains an operating state, and the operating state of the compressor 102 includes an operating state in a single-cell cooling mode or a combined cooling mode.
In some embodiments, the second target rotational speed required for the single cell cooling mode comprises 3500 revolutions per minute, the first target rotational speed required for the combined cooling mode comprises 7000 revolutions per minute, and the first rotational speed comprises 800 revolutions per minute.
Alternatively, those skilled in the art will appreciate that the rotational speed required for the combined cooling mode in which the battery 106 cooling and the passenger compartment cooling are performed simultaneously is higher than the rotational speed required for the single cell cooling mode.
Alternatively, as will be appreciated by those skilled in the art, the first target rotational speed, the second target rotational speed, and the first rotational speed may be set according to actual requirements according to differences in the respective structures in the refrigeration system 1.
Alternatively, as can be appreciated by those skilled in the art, the rotation speeds of the compressor 102 required for different times in the single-cell refrigeration mode and the combined refrigeration mode are related to factors such as the temperature of the evaporator 101 and the target refrigeration temperature, and the rotation speed of the compressor 102 in the current refrigeration mode is adjusted in real time by real time, so as to achieve a high-efficiency and energy-saving refrigeration effect, which is common knowledge in the art and will not be described herein.
According to the control method of the refrigerating system 1 provided by the embodiment of the application, when the single-battery refrigerating mode and the combined refrigerating mode are switched, the rotation speed of the compressor 102 is controlled to be reduced, and then the passenger compartment stop valve 103 is operated, so that the oil quantity of the compressor 102 is not influenced by the operation of the passenger compartment stop valve 103, and the problem of unstable oil quantity of the compressor 102 under high rotation speed is solved. Specifically:
the switching between the single-cell refrigeration mode and the combined refrigeration mode is realized by controlling the opening and closing of the stop valve of the passenger cabin to control the refrigeration mode, and after the need of switching the refrigeration mode is detected, the rotation speed of the compressor 102 is controlled to be reduced, so that the circulation speed of the refrigerant for refrigeration is reduced, the flow speed of the refrigerant is lower after the rotation speed is reduced below a first rotation speed, the oil quantity carried in the refrigerant is also more stable, and the passenger cabin stop valve 103 is operated at the moment, so that the influence on the flow speed and the oil quantity stability of the refrigerant is smaller, and the oil quantity of the compressor 102 is not reduced due to the fact that the refrigerant is charged to the evaporator 101 instantly when the passenger cabin stop valve 103 is opened; and when the passenger compartment stop valve 103 is closed, the oil accumulation of the compressor 102 is avoided due to the fact that the flow speed of the refrigerant is too high and suddenly flows back, so that the oil quantity of the compressor 102 is more stable, the compressor 102 is protected, and the service time of the compressor 102 is prolonged.
Further, when the rotation speed of the compressor 102 is small, the passenger compartment shutoff valve 103 is operated, and loss due to friction such as a cylinder wall and noise due to passenger compartment operation can be reduced.
Optionally, when the single-battery cooling mode is changed to the combined cooling mode, a flow chart of a control method of the cooling system 1 provided by the embodiment of the application is shown in fig. 3, and the method includes the following steps S301 to S307:
s301: when detecting the need for opening the passenger compartment, acquiring a real-time refrigeration mode and a real-time rotation speed of the compressor 102; when the real-time cooling mode is the single-cell cooling mode and the real-time rotation speed of the compressor 102 is the second target rotation speed required by the single-cell cooling mode, it is determined that the single-cell cooling mode needs to be switched to the combined cooling mode corresponding to the cooling requirement of the open passenger compartment.
S302: the rotation speed of the compressor is controlled to be reduced.
S303: it is determined whether a limit period is exceeded or not in real time between the real time instant and the instant when the rotational speed of the compressor 102 is first reduced. If yes, step S307 is executed, and if no, step S304 is executed.
S304: it is determined whether the rotation speed of the compressor 102 is less than the first rotation speed, if yes, step S305 is executed, and if no, step S302 is executed again.
S305: the passenger compartment shutoff valve 103 is opened.
S306: the speed of the compressor 102 is adjusted to a first target speed required for the combined cooling mode.
S307: and determining that the abnormality occurs, and prompting the user.
Optionally, when the combined cooling mode is changed to the single-battery cooling mode, a flow chart of a control method of the cooling system 1 provided by the embodiment of the application is shown in fig. 4, and the method includes the following steps S401 to S407:
s401: when the need for closing the passenger compartment is detected, a real-time refrigeration mode and a real-time rotation speed of the compressor 102 are obtained; when the real-time cooling mode is the combined cooling mode and the real-time rotational speed of the compressor 102 is the first target rotational speed required by the combined cooling mode, it is determined that the combined cooling mode needs to be switched to the single-cell cooling mode corresponding to the closed passenger compartment cooling requirement.
S402: the rotation speed of the compressor is controlled to be reduced.
S403: it is determined whether a limit period is exceeded or not in real time between the real time instant and the instant when the rotational speed of the compressor 102 is first reduced. If yes, step S407 is executed, and if no, step S404 is executed.
S404: it is determined whether the rotation speed of the compressor 102 is less than the first rotation speed, if yes, step S405 is executed, and if no, step S402 is executed again.
S405: the passenger compartment shutoff valve 103 is closed.
S406: the rotational speed of the compressor 102 is adjusted to a second target rotational speed required for the single cell cooling mode.
S407: and determining that the abnormality occurs, and prompting the user.
Based on the same inventive concept, an embodiment of the present application provides a control device 2 of a refrigeration system, as shown in fig. 5, including:
a detection module 201, configured to control a rotation speed of the compressor 102 to decrease when it is detected that a switch between the single-cell cooling mode and the combined cooling mode is required, and determine whether the rotation speed of the compressor 102 decreases below a first rotation speed within a limit period; the combined cooling mode is used to cool both the battery 106 and the passenger compartment.
The control module 202 is configured to control the passenger compartment shutoff valve 103 to operate based on a desired cooling mode if the rotational speed of the compressor 102 falls below a first rotational speed within a limited period.
And the adjusting module 203 is used for adjusting the rotation speed of the compressor 102 to the rotation speed required by the expected refrigeration mode after the passenger compartment stop valve 103 is operated.
Based on the same inventive concept, an embodiment of the present application provides a computer-readable storage medium having stored thereon a computer program which, when executed by the refrigeration system 1, implements the control method provided by the present application.
According to the control method of the refrigerating system 1 provided by the embodiment of the application, when the single-battery refrigerating mode and the combined refrigerating mode are switched, the rotation speed of the compressor 102 is controlled to be reduced, and then the passenger compartment stop valve 103 is operated, so that the oil quantity of the compressor 102 is not influenced by the operation of the passenger compartment stop valve 103, and the problem of unstable oil quantity of the compressor 102 under high rotation speed is solved. Specifically:
the switching between the single-cell refrigeration mode and the combined refrigeration mode is realized by controlling the opening and closing of the stop valve of the passenger cabin to control the refrigeration mode, and after the need of switching the refrigeration mode is detected, the rotation speed of the compressor 102 is controlled to be reduced, so that the circulation speed of the refrigerant for refrigeration is reduced, the flow speed of the refrigerant is lower after the rotation speed is reduced below a first rotation speed, the oil quantity carried in the refrigerant is also more stable, and the passenger cabin stop valve 103 is operated at the moment, so that the influence on the flow speed and the oil quantity stability of the refrigerant is smaller, and the oil quantity of the compressor 102 is not reduced due to the fact that the refrigerant is charged to the evaporator 101 instantly when the passenger cabin stop valve 103 is opened; and when the passenger compartment stop valve 103 is closed, the oil accumulation of the compressor 102 is avoided due to the fact that the flow speed of the refrigerant is too high and suddenly flows back, so that the oil quantity of the compressor 102 is more stable, the compressor 102 is protected, and the service time of the compressor 102 is prolonged.
Further, when the rotation speed of the compressor 102 is small, the passenger compartment shutoff valve 103 is operated, and loss due to friction such as a cylinder wall and noise due to passenger compartment operation can be reduced.
Those of skill in the art will appreciate that the various operations, methods, steps in the flow, acts, schemes, and alternatives discussed in the present application may be alternated, altered, combined, or eliminated. Further, other steps, means, or steps in a process having various operations, methods, or procedures discussed herein may be alternated, altered, rearranged, disassembled, combined, or eliminated. Further, steps, measures, schemes in the prior art with various operations, methods, flows disclosed in the present application may also be alternated, altered, rearranged, decomposed, combined, or deleted.
The terms "first," "second," and the like, 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 defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
In the description of the present specification, a particular feature, structure, material, or characteristic may be combined in any suitable manner in one or more embodiments or examples.
It should be understood that, although the steps in the flowcharts of the figures are shown in order as indicated by the arrows, the order in which the steps are performed is not limited to the order indicated by the arrows. In some implementations of embodiments of the application, the steps in each flow may be performed in other orders as desired, unless explicitly stated herein. Moreover, some or all of the steps in the flowcharts may include multiple sub-steps or multiple stages based on the actual implementation scenario. Some or all of the sub-steps or stages may be performed at the same time, or may be performed at different times, where the execution sequence of the sub-steps or stages may be flexibly configured according to the requirements, which is not limited by the embodiment of the present application.
The foregoing is only a part of the embodiments of the present application, and it should be noted that, for those skilled in the art, other similar implementation means based on the technical idea of the present application may be adopted without departing from the technical idea of the solution of the present application, which is also within the protection scope of the embodiments of the present application.

Claims (11)

1. A method of controlling a refrigeration system, comprising:
when the need of switching between the single-battery refrigeration mode and the combined refrigeration mode is detected, controlling the rotation speed of the compressor to be reduced, and determining whether the rotation speed of the compressor is reduced below a first rotation speed within a limiting period; the combined refrigeration mode is used for refrigerating both the battery and the passenger cabin;
if yes, controlling the passenger compartment stop valve to operate based on a desired refrigeration mode;
and after the action of the passenger cabin stop valve is finished, regulating the rotating speed of the compressor to the rotating speed required by the expected refrigeration mode.
2. The control method according to claim 1, wherein determining whether the rotational speed of the compressor falls below the first rotational speed within a limit period includes:
determining whether a real-time period between a real-time and a first reduction time of the rotation speed of the compressor exceeds the limit period;
and when the real-time period is not greater than the limit period, determining whether the rotational speed of the compressor is less than a first rotational speed.
3. The control method according to claim 2, wherein after determining whether the rotational speed of the compressor is less than the first rotational speed, further comprising:
and when the rotating speed of the compressor is not less than the first rotating speed, continuing to control the rotating speed of the compressor to be reduced until the rotating speed of the compressor is not less than the first rotating speed and the real-time period is greater than the limiting period.
4. The control method of claim 1, wherein controlling the passenger compartment shutoff valve to operate based on a desired cooling mode comprises: opening the passenger compartment shutoff valve when the desired cooling mode is the combined cooling mode;
and adjusting the rotational speed of the compressor to a rotational speed required for the desired cooling mode after the actuation of the passenger compartment shutoff valve is completed, comprising: and after the passenger cabin stop valve is opened, regulating the rotating speed of the compressor to a first target rotating speed required by the combined refrigeration mode.
5. The control method of claim 1, wherein controlling the passenger compartment shutoff valve to operate based on a desired cooling mode comprises: closing the passenger compartment shutoff valve when the desired cooling mode is the single cell cooling mode;
and adjusting the rotational speed of the compressor to a rotational speed required for the desired cooling mode after the actuation of the passenger compartment shutoff valve is completed, comprising: and after the passenger cabin stop valve is closed, regulating the rotating speed of the compressor to a second target rotating speed required by the single-cell refrigeration mode.
6. The control method according to claim 4 or 5, characterized by comprising at least one of:
the limit period includes not more than 2.5s;
the first rotational speed includes a lowest rotational speed at which the compressor maintains an operating state, and the first rotational speed is less than the first target rotational speed or the second target rotational speed.
7. The control method according to claim 1, wherein a period of time taken for the compressor to drop from the real-time rotational speed to below the first rotational speed does not overlap with a period of time taken for the actuation of the passenger compartment shutoff valve.
8. The control method as set forth in claim 7, wherein the second target rotation speed required for the single cell cooling mode includes 3500 rotations per minute, the first target rotation speed required for the combined cooling mode includes 7000 rotations per minute, and the first rotation speed includes 800 rotations per minute.
9. A control device of a refrigeration system, comprising:
the detection module is used for controlling the rotation speed of the compressor to be reduced when the single-cell refrigeration mode and the combined refrigeration mode are required to be switched, and determining whether the rotation speed of the compressor is reduced below a first rotation speed within a limiting period; the combined refrigeration mode is used for refrigerating both the battery and the passenger cabin;
the control module is used for controlling the passenger cabin stop valve to act based on a desired refrigeration mode if the rotating speed of the compressor is reduced below a first rotating speed within a limiting period;
and the adjusting module is used for adjusting the rotating speed of the compressor to the rotating speed required by the expected refrigeration mode after the action of the passenger cabin stop valve is finished.
10. A refrigeration system, comprising: the system comprises a controller, an evaporator, a compressor, a heat exchanger, a passenger cabin stop valve and a passenger cabin air conditioner;
the evaporator, the compressor, the passenger cabin stop valve and the passenger cabin air conditioner are connected through pipelines in sequence and form a first fluid loop; the evaporator, the compressor and the heat exchanger are sequentially connected through pipelines to form a second fluid loop, so that the heat exchanger is close to, contacted with or mechanically connected with a battery;
the controller is electrically connected to both the compressor and the passenger compartment shutoff valve for performing the control method of any of claims 1-8.
11. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when executed by a refrigeration system, implements the control method according to any one of claims 1-8.
CN202210426809.5A 2022-04-21 2022-04-21 Control method, control device and storage medium of refrigerating system Pending CN116968512A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210426809.5A CN116968512A (en) 2022-04-21 2022-04-21 Control method, control device and storage medium of refrigerating system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210426809.5A CN116968512A (en) 2022-04-21 2022-04-21 Control method, control device and storage medium of refrigerating system

Publications (1)

Publication Number Publication Date
CN116968512A true CN116968512A (en) 2023-10-31

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210426809.5A Pending CN116968512A (en) 2022-04-21 2022-04-21 Control method, control device and storage medium of refrigerating system

Country Status (1)

Country Link
CN (1) CN116968512A (en)

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