CN116465108A - Refrigerating system control method and device and power battery test equipment - Google Patents

Refrigerating system control method and device and power battery test equipment Download PDF

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Publication number
CN116465108A
CN116465108A CN202310431831.3A CN202310431831A CN116465108A CN 116465108 A CN116465108 A CN 116465108A CN 202310431831 A CN202310431831 A CN 202310431831A CN 116465108 A CN116465108 A CN 116465108A
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China
Prior art keywords
temperature
value
actual
opening
electronic expansion
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CN202310431831.3A
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Chinese (zh)
Inventor
余颖
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Jiangsu Tuomiluo High End Equipment Co ltd
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Jiangsu Tuomiluo High End Equipment Co ltd
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Priority to CN202310431831.3A priority Critical patent/CN116465108A/en
Publication of CN116465108A publication Critical patent/CN116465108A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B31/00—Compressor arrangements
    • F25B31/002—Lubrication
    • F25B31/004—Lubrication oil recirculating 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F25B41/24—Arrangement of shut-off valves for disconnecting a part of the refrigerant cycle, e.g. an outdoor part
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/40—Fluid line 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
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/385—Arrangements for measuring battery or accumulator variables
    • 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

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Air Conditioning Control Device (AREA)
  • Secondary Cells (AREA)

Abstract

The invention discloses a control method and device of a refrigerating system and power battery testing equipment. The control method of the refrigerating system comprises the following steps: updating the target opening of the electronic expansion valve when the duration of maintaining the current actual temperature of the test chamber by the refrigeration system is greater than or equal to the first preset duration or the duration of maintaining the current opening of the electronic expansion valve is greater than or equal to the second preset duration; when the first difference value between the actual temperature of the test chamber and the outlet temperature of the evaporator is smaller than a first temperature judgment value or the first difference value is larger than a second temperature judgment value, the opening of the electronic expansion valve is adjusted according to the target opening; and when the first difference value is larger than or equal to the first temperature judgment value and smaller than or equal to the second temperature judgment value, the electronic expansion valve maintains the current opening for a second preset time. The technical scheme of the embodiment of the invention avoids the problems of liquid impact and oil shortage of the compressor and ensures that the refrigerating system can normally and reliably operate.

Description

Refrigerating system control method and device and power battery test equipment
The invention is a divisional application, the application number of the main application is 2022115241768, and the application date is 2022, 12 and 1.
Technical Field
The present invention relates to the field of refrigeration technologies, and in particular, to a method and an apparatus for controlling a refrigeration system, and a power battery testing device.
Background
The power battery environment test equipment is used for simulating the influence of temperature stress on the battery under different environment conditions, and is commonly used for testing the quality, charge-discharge performance, service life and long-term reliability of the battery. The power battery environment test equipment comprises a refrigerating system which is used for refrigerating when the temperature of the power battery is high.
The main refrigerating path of the refrigerating system comprises a condenser, a main path valve, an evaporator and a compressor, wherein the inlet side of the compressor is a low-pressure low-temperature side, the outlet side of the compressor is a high-temperature high-pressure side, the opening of the main path valve of the main refrigerating path is controlled according to a fixed temperature interval, namely, the opening of the main path valve is controlled according to a temperature interval corresponding to the temperature of the power battery and the environment where the refrigerating system is positioned.
The opening of the main way valve of the refrigeration main way is controlled according to a fixed temperature interval, so that the main way valve still maintains the current opening under the working conditions of power failure and alarm shutdown, and before the next refrigeration cycle is started, the refrigerant is migrated to the low-pressure low-temperature side, so that a large amount of refrigerant is gathered at the low-pressure side, the problems of liquid impact, oil shortage and the like of the light compressor are caused, part of working condition points cannot be normally tested, the heavy compressor is damaged, the refrigeration system cannot operate, and further the battery test cannot be performed.
Disclosure of Invention
The invention provides a control method and device of a refrigeration system and power battery test equipment, which are used for solving the problems that a compressor in the refrigeration system is easy to generate liquid impact and oil shortage.
According to an aspect of the present invention, there is provided a refrigeration system control method, the refrigeration system including a refrigeration main; the refrigeration main path comprises a compressor, a condenser, an electronic expansion valve and an evaporator which are sequentially connected in series; the evaporator is positioned in the test chamber;
the control method comprises the following steps:
updating the target opening of the electronic expansion valve when the duration of maintaining the current actual temperature of the test chamber by the refrigeration system is greater than or equal to a first preset duration or the duration of maintaining the current opening of the electronic expansion valve is greater than or equal to a second preset duration;
when the first difference value between the actual temperature of the test chamber and the outlet temperature of the evaporator is smaller than a first temperature judgment value or the first difference value is larger than a second temperature judgment value, the opening of the electronic expansion valve is adjusted according to the target opening, so that the difference value between the actual temperature of the test chamber and the set temperature of the test chamber is within a preset difference value range;
when the first difference value is greater than or equal to the first temperature judgment value and less than or equal to the second temperature judgment value, the electronic expansion valve maintains the current opening for a second preset time period;
The refrigerating system also comprises a liquid spraying supplementing path; the liquid spraying compensation path is connected between the inlet of the compressor and the inlet of the evaporator and comprises a liquid spraying valve and a first capillary tube which are connected in series;
the control method further includes:
determining a first deviation range in which a second difference between an actual discharge temperature value and a target discharge temperature value of the compressor is located;
searching a target state of the liquid spraying valve corresponding to the first deviation range under the current working condition from a first preset relation; the current working condition comprises the actual temperature of the test chamber and the current environment temperature of the environment where the refrigerating system is located, and the first preset relationship is the corresponding relationship among the actual temperature, the current environment temperature, the first deviation range and the target state;
controlling the liquid spraying valve to be opened or closed according to the target state;
and/or the number of the groups of groups,
determining a second deviation range in which a third difference between the actual suction temperature value and the target suction temperature value of the compressor is located;
searching a target state of the liquid spraying valve corresponding to the second deviation range under the current working condition from a second preset relation; the second preset relationship is a corresponding relationship between the actual temperature, the current environment temperature, the second deviation range and the target state;
And controlling the opening or closing of the liquid spraying valve according to the target state.
Optionally, when the first difference between the actual temperature of the test chamber and the outlet temperature of the evaporator is smaller than a first temperature determination value or the first difference is larger than a second temperature determination value, adjusting the opening of the electronic expansion valve according to the target opening, so that the difference between the actual temperature of the test chamber and the set temperature of the test chamber is within a preset difference range, including:
when the first difference value is smaller than a first temperature judgment value, reducing the opening of the electronic expansion valve according to the opening adjustment rate until the opening of the electronic expansion valve reaches the target opening, so that the difference value between the actual temperature of the test chamber and the set temperature of the test chamber is within a preset difference value range;
and when the first difference value is larger than a second temperature judgment value, the opening of the electronic expansion valve is lifted according to the opening adjustment rate until the opening of the electronic expansion valve reaches the target opening, so that the difference value between the actual temperature of the test chamber and the set temperature of the test chamber is within a preset difference value range.
Optionally, before the opening degree of the electronic expansion valve is reduced according to the opening degree adjustment rate when the first difference value is smaller than the first temperature determination value, the method further includes:
And calculating the opening adjustment rate of the electronic expansion valve according to the target opening, the current opening of the electronic expansion valve, the starting time of the opening adjustment of the electronic expansion valve and the ending time of the opening adjustment of the electronic expansion valve.
Optionally, the control method further includes:
controlling the opening or closing of the liquid spraying valve according to the exhaust temperature range of the actual exhaust temperature value of the compressor and the change relation of the actual exhaust temperature value along with time;
and/or controlling the opening or closing of the liquid spraying valve according to the suction temperature range of the actual suction temperature value of the compressor and the change relation of the actual suction temperature value along with time.
Optionally, before controlling the opening or closing of the liquid spraying valve according to the exhaust temperature range in which the actual exhaust temperature value of the compressor is located and the change relation of the actual exhaust temperature value with time, the liquid spraying valve further comprises:
acquiring a first actual exhaust temperature value of the compressor at a first moment and a second actual exhaust temperature value of the compressor at a second moment;
determining an exhaust temperature range in which the first or second actual exhaust temperature values are located;
Determining a change relation of the actual exhaust temperature value along with time according to a ratio of a first temperature difference value of the second actual exhaust temperature value and the first actual exhaust temperature value to a first period of time; wherein the first period is a time difference between the second time and the first time;
before controlling the opening or closing of the liquid spraying valve according to the suction temperature range where the actual suction temperature value of the compressor is and the change relation of the actual suction temperature value with time, the liquid spraying valve further comprises:
acquiring a first actual air suction temperature value of the compressor at a third time and a second actual air suction temperature value of the compressor at a fourth time;
determining an air suction temperature range in which the first actual air suction temperature or the second actual air suction temperature value is located;
determining a change relation of the actual air suction temperature value along with time according to a ratio of a second temperature difference value of the second actual air suction temperature value and the first actual air suction temperature value to a second period of time; wherein the second period is a time difference between the fourth time and the third time.
Optionally, the controlling the opening or closing of the liquid spraying valve according to the exhaust temperature range in which the actual exhaust temperature value of the compressor is and the change relation of the actual exhaust temperature value with time includes:
Dividing a temperature value between the exhaust gas temperature minimum value and the exhaust gas temperature maximum value into a first exhaust gas temperature range and a second exhaust gas temperature range; wherein the first exhaust temperature range is from the exhaust temperature minimum value to an exhaust temperature intermediate value, and the second exhaust temperature range is from the exhaust temperature intermediate value to the exhaust temperature maximum value;
if the actual exhaust temperature value is in the first exhaust temperature range and the change relation of the actual exhaust temperature value with time is that the change relation of the actual exhaust temperature value with time is reduced, the liquid spraying valve is controlled to be closed;
and if the actual exhaust temperature value is in the second exhaust temperature range and the change relation of the actual exhaust temperature value with time is that the actual exhaust temperature value is increased with time, controlling the liquid spraying valve to be opened.
Optionally, the controlling the opening or closing of the liquid spraying valve according to the suction temperature range in which the actual suction temperature value of the compressor is located and the change relation of the actual suction temperature value with time includes:
dividing a temperature value between the minimum suction temperature value and the maximum suction temperature value into a first suction temperature range and a second suction temperature range; the first air suction temperature range is from the minimum air suction temperature to the middle air suction temperature, and the second air suction temperature range is from the middle air suction temperature to the maximum air suction temperature;
If the actual air suction temperature value is in the first air suction temperature range and the change relation of the actual air suction temperature value with time is that the change relation of the actual air suction temperature value with time is reduced, the liquid spraying valve is controlled to be closed;
and if the actual air suction temperature value is in the second air suction temperature range and the change relation of the actual air suction temperature value with time is that the actual air suction temperature value is increased with time, controlling the opening of the liquid spraying valve.
Optionally, the refrigeration system further comprises a hot gas bypass make-up path connected between the outlet of the compressor and the inlet of the evaporator, the hot gas bypass make-up path comprising a hot gas valve and a second capillary tube;
the control method further includes:
when the actual temperature of the test chamber is smaller than the preset temperature of the test chamber, the hot gas valve is controlled to be opened;
and when the actual temperature is greater than or equal to the preset temperature, controlling the hot gas valve to be closed.
According to another aspect of the present invention, there is provided a refrigeration system control apparatus, the refrigeration system including a refrigeration main; the refrigeration main path comprises a compressor, a condenser, an electronic expansion valve and an evaporator which are sequentially connected in series; the evaporator is positioned in the test chamber;
The refrigeration system control device includes:
the target opening updating module is used for updating the target opening of the electronic expansion valve when the duration of maintaining the current actual temperature of the test chamber of the refrigeration system is greater than or equal to a first preset duration or the duration of maintaining the current opening of the electronic expansion valve is greater than or equal to a second preset duration;
the opening adjusting module is used for adjusting the opening of the electronic expansion valve according to the target opening when the first difference value between the actual temperature of the test chamber and the outlet temperature of the evaporator is smaller than a first temperature judgment value or the first difference value is larger than a second temperature judgment value so that the difference value between the actual temperature of the test chamber and the set temperature of the test chamber is in a preset difference value range;
the opening maintaining module is used for maintaining the current opening of the electronic expansion valve for a second preset duration when the first difference value is larger than or equal to the first temperature judging value and smaller than or equal to the second temperature judging value;
the refrigerating system control device also comprises a liquid spraying valve control module, wherein the liquid spraying valve control module is used for:
determining a first deviation range in which a second difference between an actual discharge temperature value and a target discharge temperature value of the compressor is located;
Searching a target state of the liquid spraying valve corresponding to the first deviation range under the current working condition from a first preset relation; the current working condition comprises the actual temperature of the test chamber and the current environment temperature of the environment where the refrigerating system is located, and the first preset relationship is the corresponding relationship among the actual temperature, the current environment temperature, the first deviation range and the target state;
controlling the liquid spraying valve to be opened or closed according to the target state;
and/or the number of the groups of groups,
determining a second deviation range in which a third difference between the actual suction temperature value and the target suction temperature value of the compressor is located;
searching a target state of the liquid spraying valve corresponding to the second deviation range under the current working condition from a second preset relation; the second preset relationship is a corresponding relationship between the actual temperature, the current environment temperature, the second deviation range and the target state;
and controlling the opening or closing of the liquid spraying valve according to the target state.
According to another aspect of the present invention, there is provided a power battery testing apparatus including a battery testing device, a refrigeration system, and a refrigeration system control device according to any embodiment of the present invention;
The battery testing device is connected with the power battery and is used for acquiring parameter information of the power battery at different temperatures;
the refrigerating system control device is connected with the refrigerating system and is used for controlling the refrigerating system to operate when the temperature of the power battery is greater than a temperature threshold value.
According to the technical scheme, when the first difference value between the actual temperature of the test chamber and the outlet temperature of the evaporator is smaller than the first temperature judgment value or the first difference value is larger than the second temperature judgment value, the opening of the electronic expansion valve is adjusted according to the target opening, so that the opening of the electronic expansion valve reaches the target opening, and the difference value between the actual temperature of the test chamber and the set temperature of the test chamber is in a preset difference range. Therefore, the opening degree of the electronic expansion valve is controlled according to actual requirements, so that the opening degree of the electronic expansion valve is maintained in a proper state, and the problems of liquid impact and oil shortage of the compressor are avoided. When the first difference value between the actual temperature of the test chamber and the outlet temperature of the evaporator is larger than or equal to a first temperature judgment value and smaller than or equal to a second temperature judgment value, the electronic expansion valve maintains the current opening, and when the duration of maintaining the current opening of the electronic expansion valve reaches a second preset duration, whether the electronic expansion valve needs to be regulated is judged. Through the first difference of periodic judgement test room actual temperature and evaporimeter exit temperature, can in time adjust the aperture of electronic expansion valve when first difference is less than first temperature judgement value or is greater than first temperature judgement value for the aperture of electronic expansion valve maintains in suitable state, and then guarantees that the compressor can normally work, thereby avoids the problem that the compressor takes place liquid impact and lacks oily. The technical scheme of the embodiment of the invention solves the problems of easy occurrence of liquid impact and oil shortage of the compressor and ensures that the refrigerating system can normally operate.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a prior art refrigeration system;
FIG. 2 is a flow chart of a method of controlling a refrigeration system according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a refrigeration system according to an embodiment of the present invention;
FIG. 4 is a flow chart of yet another method of controlling a refrigeration system according to an embodiment of the present invention;
FIG. 5 is a flow chart of yet another method of controlling a refrigeration system according to an embodiment of the present invention;
FIG. 6 is a flow chart of yet another method of refrigeration system control provided by an embodiment of the present invention;
FIG. 7 is a flow chart of yet another method of controlling a refrigeration system according to an embodiment of the present invention;
FIG. 8 is a flow chart of yet another method of refrigeration system control provided by an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a control device for a refrigeration system according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a battery testing apparatus according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
A conventional refrigeration system of a power battery is implemented by vapor compression refrigeration, and fig. 1 is a schematic diagram of a refrigeration system in the prior art, and as shown in fig. 1, the refrigeration system includes a compressor 110, a condenser 120, a condensing fan N1, a drying filter G1, an electronic expansion valve 130, an evaporator 140, a circulating fan F1, a heater 170, a spray valve 210, a first capillary tube 220, a hot gas valve 310, and a second capillary tube 320, and the evaporator 140 is located in a test chamber 150. The operation process of the refrigerating system is as follows:
starting a start button, starting a refrigeration system to work, sucking superheated steam after the compressor 110 is electrified, and compressing gaseous refrigerant into high-temperature and high-pressure gas refrigerant superheated steam; the high-temperature high-pressure gas refrigerant superheated steam enters the condenser 120 through the exhaust pipeline, and the condenser 120 and the condensing fan N1 are condensed and then become normal-temperature high-pressure liquid refrigerant; the normal temperature high pressure liquid refrigerant is divided into two parts after removing water vapor through the drying filter G1, one part of the liquid refrigerant enters the evaporator 140 and the circulating fan F1 to evaporate, vaporize, absorb heat and refrigerate after being throttled and depressurized by the electronic expansion valve 130 of the main way, the temperature of the test chamber is reduced, a heater 170 is also arranged near the evaporator 140, when the temperature of the test chamber is close to the target set temperature, the heater 170 is started, the heater 170 carries out opposite flushing adjustment of cold and heat quantity so as to maintain the temperature of the test chamber 150 within the target set temperature range, the evaporated refrigerant is changed into superheated steam to be sucked into an air suction port of the compressor 110 through an air suction pipeline, and the refrigeration and cooling cycle is completed; the other liquid spraying valve 210 enters the first capillary tube 220 through the supplementing path, is throttled and depressurized through the first capillary tube 220 and then is sprayed into the air suction pipeline of the compressor 110, so that the overheat steam sucked by the compressor 110 is prevented from being overhigh in temperature, and the liquid spraying cooling supplementing path is completed. In addition, the other hot gas bypass compensation path is provided, the high-temperature and high-pressure gas refrigerant superheated steam discharged by the compressor 110 enters the second capillary tube 320 through the hot gas valve 310, and enters the inlet of the evaporator 140 after being throttled and depressurized by the second capillary tube 320, so that the condition that the pressure in the evaporator 140 is too low due to too low temperature of the test chamber 150 is avoided, and the damage to the compressor 110 caused by unsmooth oil return is avoided.
However, in the above adjustment process, the open state of the electronic expansion valve 130 is controlled in a fixed temperature interval, and in this case, under the working conditions of power failure and alarm shutdown, the electronic expansion valve 130 still maintains the current opening, and before the next refrigeration cycle is started, the refrigerant migrates to the low-pressure low-temperature side, so that a large amount of refrigerant is accumulated on the low-pressure side, the light compressor is subjected to liquid impact and oil shortage, the heavy compressor 110 is damaged, the refrigeration system cannot operate, and further the battery test cannot be performed.
In view of the above technical problems, an embodiment of the present invention provides a control method for a refrigeration system, fig. 2 is a flowchart of the control method for a refrigeration system provided by the embodiment of the present invention, and fig. 3 is a schematic structural diagram of the refrigeration system provided by the embodiment of the present invention, where, as shown in fig. 3, the refrigeration system includes a refrigeration main path; the refrigeration main circuit includes a compressor 110, a condenser 120, an electronic expansion valve 130, and an evaporator 140 connected in series in this order; the evaporator 140 is located in the test chamber 150; the refrigeration system further includes a test chamber temperature sensor T1 and an evaporator outlet temperature sensor T2, the test chamber temperature sensor T1 being disposed in the test chamber 150, the evaporator outlet temperature sensor T2 being disposed at the outlet of the evaporator 140.
As shown in fig. 2 and 3, the refrigeration system control method includes:
s101, updating the target opening of the electronic expansion valve when the duration of maintaining the current actual temperature of the test chamber of the refrigeration system is greater than or equal to a first preset duration or the duration of maintaining the current opening of the electronic expansion valve is greater than or equal to a second preset duration.
Specifically, when the duration of maintaining the current actual temperature of the test chamber in the refrigeration system is greater than or equal to the first preset duration, or the duration of maintaining the current opening of the electronic expansion valve 130 is greater than or equal to the second preset duration, it indicates that the electronic expansion valve 130 is maintained to be currently opened for a longer period of time, and the current oil return amount is difficult to continuously maintain the operation of the compressor 110, so that the refrigerants all migrate to the low-pressure low-temperature side, a large amount of refrigerants are accumulated on the low-pressure side, and the oil shortage or the liquid impact phenomenon occurs in the compressor 110, so that the target opening of the electronic expansion valve 130 is redetermined. The target opening degree of the electronic expansion valve 130 is the maximum opening degree required by the electronic expansion valve 130 when the actual temperature of the test chamber meets the preset temperature condition, and the preset temperature condition is that the difference between the actual temperature of the test chamber and the set temperature of the test chamber is within the preset difference range.
S102, judging that a first difference value between the actual temperature of the test chamber and the outlet temperature of the evaporator is larger than or equal to a first temperature judgment value and smaller than or equal to a second temperature judgment value; if not, executing step S103; if yes, go to step S104.
Specifically, the second temperature determination value is greater than the first temperature determination value. When the first difference between the actual temperature of the test chamber 150 and the evaporator outlet temperature is greater than or equal to the first temperature determination value and less than or equal to the second temperature determination value, it indicates that the actual temperature of the test chamber 150 is within the normal range, and the opening of the electronic expansion valve 130 does not need to be adjusted. When the first difference between the actual temperature of the test chamber and the outlet temperature of the evaporator is smaller than the first temperature determination value or the first difference is larger than the second temperature determination value, it indicates that the actual temperature of the test chamber 150 is abnormal, and the opening of the electronic expansion valve 130 needs to be adjusted.
S103, adjusting the opening of the electronic expansion valve according to the target opening so that the difference value between the actual temperature of the test chamber and the set temperature of the test chamber is within a preset difference value range.
Specifically, when the first difference between the actual temperature of the test chamber 150 and the outlet temperature of the evaporator is smaller than the first temperature determination value, which indicates that the actual temperature of the test chamber 150 is too low, that is, the refrigerant entering the test chamber 150 is too much, the opening of the electronic expansion valve 130 needs to be adjusted, for example, the opening of the electronic expansion valve 130 is reduced, and the opening of the electronic expansion valve 130 is adjusted according to the target opening, so that the opening of the electronic expansion valve 130 reaches the target opening, and the difference between the actual temperature of the test chamber 150 and the set temperature of the test chamber is within the preset difference range. When the first difference between the actual temperature of the test chamber 150 and the outlet temperature of the evaporator is greater than the second temperature determination value, which indicates that the actual temperature of the test chamber 150 is too high, that is, the refrigerant entering the test chamber 150 is too low, the opening of the electronic expansion valve 130 needs to be adjusted, for example, the opening of the electronic expansion valve 130 is lifted, and the opening of the electronic expansion valve 130 is adjusted according to the target opening, so that the opening of the electronic expansion valve 130 reaches the target opening, and the difference between the actual temperature of the test chamber 150 and the set temperature of the test chamber is within the preset difference range. Therefore, the opening degree of the electronic expansion valve 130 is controlled according to the actual demand, so that the opening degree of the electronic expansion valve 130 is maintained in a proper state, thereby avoiding the problems of liquid impact and oil shortage of the compressor 110.
And S104, maintaining the current opening of the electronic expansion valve for a second preset time.
Specifically, when the first difference between the actual temperature of the test chamber 150 and the outlet temperature of the evaporator is greater than or equal to the first temperature determination value and less than or equal to the second temperature determination value, it indicates that the actual temperature of the test chamber 150 is within the normal range, and the difference between the actual temperature of the test chamber 150 and the set temperature of the test chamber is within the preset difference range, without adjusting the electronic expansion valve 130, that is, the electronic expansion valve 130 maintains the current opening, and returns to step S101, and when the duration of maintaining the current opening of the electronic expansion valve 130 reaches the second preset duration, the first difference is determined, and whether the electronic expansion valve 130 needs to be adjusted is determined. By periodically judging the first difference between the actual temperature of the test chamber 150 and the outlet temperature of the evaporator, when the first difference is smaller than the first temperature judgment value or larger than the first temperature judgment value, the opening of the electronic expansion valve 130 can be timely adjusted, so that the opening of the electronic expansion valve 130 is maintained in a proper state, and the compressor 110 can be further ensured to work normally, thereby avoiding the problems of liquid impact and oil shortage of the compressor 110.
According to the technical scheme of the embodiment, when the first difference value between the actual temperature of the test chamber and the outlet temperature of the evaporator is smaller than the first temperature judgment value or the first difference value is larger than the second temperature judgment value, the opening of the electronic expansion valve is adjusted according to the target opening, so that the opening of the electronic expansion valve reaches the target opening, and the difference value between the actual temperature of the test chamber and the set temperature of the test chamber is in a preset difference range. Therefore, the opening degree of the electronic expansion valve is controlled according to actual requirements, so that the opening degree of the electronic expansion valve is maintained in a proper state, and the problems of liquid impact and oil shortage of the compressor are avoided. When the first difference value between the actual temperature of the test chamber and the outlet temperature of the evaporator is larger than or equal to a first temperature judgment value and smaller than or equal to a second temperature judgment value, the electronic expansion valve maintains the current opening, and when the duration of maintaining the current opening of the electronic expansion valve reaches a second preset duration, whether the electronic expansion valve needs to be regulated is judged. Through the first difference of periodic judgement test room actual temperature and evaporimeter exit temperature, can in time adjust the aperture of electronic expansion valve when first difference is less than first temperature judgement value or is greater than first temperature judgement value for the aperture of electronic expansion valve maintains in suitable state, and then guarantees that the compressor can normally work, thereby avoids the problem that the compressor takes place liquid impact and lacks oily. The technical scheme of the embodiment of the invention solves the problems of easy occurrence of liquid impact and oil shortage of the compressor and ensures that the refrigerating system can normally operate.
On the basis of the above technical solution, fig. 4 is a flowchart of another control method of a refrigeration system according to an embodiment of the present invention, where S102 is further refined in the above embodiment. As shown in fig. 3 and 4, the refrigeration system control method includes:
s201, updating the target opening of the electronic expansion valve when the duration of maintaining the current actual temperature of the test chamber of the refrigeration system is greater than or equal to the first preset duration or the duration of maintaining the current opening of the electronic expansion valve is greater than or equal to the second preset duration.
S202, calculating the opening adjustment rate of the electronic expansion valve according to the target opening, the current opening of the electronic expansion valve, the starting time of the opening adjustment of the electronic expansion valve and the ending time of the opening adjustment of the electronic expansion valve.
Specifically, the target opening degree of the electronic expansion valve 130 is D1, the current opening degree of the electronic expansion valve 130 is D2, and the opening degree of the electronic expansion valve 130 is adjustedIs t1, and the opening degree adjustment of the electronic expansion valve 130 is t2, the opening degree adjustment rate of the electronic expansion valve 130 is thenWherein the end time t2=t1+max { Δt2a, Δt2b } of the opening adjustment of the electronic expansion valve 130; wherein Δt2a is the time required for the electronic expansion valve 130 to reach the maximum opening when the temperature of the test chamber maintains the difference between the actual temperature of the test chamber and the set temperature of the test chamber within the preset difference range; delta t2b is the time required for the electronic expansion valve 130 to reach the maximum opening when the temperature of the test chamber satisfies the difference between the actual temperature of the test chamber and the set temperature of the test chamber within the preset difference range. Δt2a and Δt2b are determined by parameters during operation and may also be determined empirically.
S203, judging whether a first difference value between the actual temperature of the test chamber and the outlet temperature of the evaporator is smaller than a first temperature judgment value, if so, executing a step S204; if not, go to step S205.
Specifically, when the first difference between the actual temperature of the test chamber 150 and the evaporator outlet temperature is smaller than the first temperature determination value, the actual temperature of the surface test chamber 150 is too low, the refrigerant input is too high, and the opening of the electronic expansion valve 130 needs to be reduced. When the first difference between the actual temperature of the test chamber 150 and the outlet temperature of the evaporator is greater than or equal to the first temperature determination value, further determination is made as to whether the first difference is greater than the second temperature determination value.
S204, reducing the opening of the electronic expansion valve according to the opening adjustment rate until the opening of the electronic expansion valve reaches the target opening, so that the difference value between the actual temperature of the test chamber and the set temperature of the test chamber is within a preset difference value range.
Specifically, the opening degree of the electronic expansion valve 130 is gradually reduced according to the opening degree adjusting rate, so that the larger opening degree change is avoided, the larger temperature change of the inlet of the evaporator 140 is caused, and larger impact is caused to the evaporator 140, thereby achieving the effect of protecting the evaporator 140 and the compressor 110. The opening degree of the electronic expansion valve 130 is gradually reduced until the opening degree of the electronic expansion valve 130 reaches the target opening degree, so that the difference between the actual temperature of the test chamber 150 and the set temperature of the test chamber is within the preset difference range. Therefore, the opening degree of the electronic expansion valve 130 is controlled according to the actual demand, so that the opening degree of the electronic expansion valve 130 is maintained in a proper state, thereby avoiding the problems of liquid impact and oil shortage of the compressor 110.
S205, judging whether a first difference value between the actual temperature of the test chamber and the outlet temperature of the evaporator is larger than a second temperature judgment value, if so, executing a step S206; if not, go to step S207.
Specifically, when the first difference between the actual temperature of the test chamber 150 and the evaporator outlet temperature is greater than the second temperature determination value, it indicates that the actual temperature of the test chamber 150 is too high, the refrigerant input is too low, and the opening of the electronic expansion valve needs to be increased. When the first difference between the actual temperature of the test chamber 150 and the outlet temperature of the evaporator is greater than or equal to the first temperature determination value and less than or equal to the second temperature determination value, it indicates that the actual temperature of the test chamber 150 is within the normal range, and the difference between the actual temperature of the test chamber 150 and the set temperature of the test chamber is within the preset difference range, without adjusting the electronic expansion valve 130.
S206, the opening of the electronic expansion valve is increased according to the opening adjusting speed until the opening of the electronic expansion valve reaches the target opening, so that the difference value between the actual temperature of the test chamber and the set temperature of the test chamber is within the preset difference value range.
Specifically, the opening of the electronic expansion valve 130 is gradually increased according to the opening adjustment rate, so that the impact on the evaporator 140 caused by large opening change is avoided, and the effect of protecting the evaporator 140 and the compressor 110 is achieved. The opening degree of the electronic expansion valve 130 is gradually increased until the opening degree of the electronic expansion valve 130 reaches the target opening degree, so that the difference between the actual temperature of the test chamber 150 and the set temperature of the test chamber is within the preset difference range. Therefore, the opening degree of the electronic expansion valve 130 is controlled according to the actual demand, so that the opening degree of the electronic expansion valve 130 is maintained in a proper state, thereby avoiding the problems of liquid impact and oil shortage of the compressor 110.
S207, maintaining the current opening of the electronic expansion valve for a second preset time period.
On the basis of the above technical solutions, as shown in fig. 3, the refrigeration system further includes a spray liquid supplementing path; a spray line connected between the inlet of the compressor 110 and the inlet of the evaporator 140, the spray line comprising a spray valve 210 and a first capillary tube 220 connected in series; in order to avoid the compressor 110 from generating liquid impact, the liquid spraying valve 210 of the liquid spraying supplementing path needs to be controlled, so that the phenomenon that the liquid impact of the compressor 110 is caused by excessive liquid spraying of the liquid spraying valve 210 is avoided. The refrigeration system further includes an exhaust temperature sensor T3 and an intake temperature sensor T4, the exhaust temperature sensor T3 is located at an outlet of the compressor 110, the exhaust temperature sensor T3 detects an exhaust temperature of the compressor 110, the intake temperature sensor T4 is located at an inlet of the compressor, and the intake temperature sensor T4 detects an intake temperature of the compressor 110.
In controlling the opening and closing of the liquid spray valve 210, the control may be performed according to the discharge temperature range in which the actual discharge temperature value of the compressor 110 is located and the trend of the change in the actual discharge temperature value, the control may be performed according to the suction temperature range in which the actual suction temperature value of the compressor 110 is located and the trend of the change in the actual suction temperature value, the control may be performed according to the first deviation range in which the second difference between the actual discharge temperature value of the compressor 110 and the target discharge temperature value is located, or the control may be performed according to the second deviation range in which the third difference between the actual suction temperature value of the compressor 110 and the target suction temperature value is located. The method of controlling the refrigeration system will be described with reference to the method of controlling the spray valve 210 and the method of controlling the electronic expansion valve 130, but the present invention is not limited thereto.
In one implementation, fig. 5 is a flowchart of yet another refrigeration system control method according to an embodiment of the present invention, and optionally, referring to fig. 3 and 5, the refrigeration system control method includes:
and S301, updating the target opening of the electronic expansion valve when the duration of maintaining the current actual temperature of the test chamber of the refrigeration system is greater than or equal to the first preset duration or the duration of maintaining the current opening of the electronic expansion valve is greater than or equal to the second preset duration.
S302, judging that a first difference value between the actual temperature of the test chamber and the outlet temperature of the evaporator is larger than or equal to a first temperature judgment value and smaller than or equal to a second temperature judgment value; if not, go to step S303; if yes, go to step S304.
S303, adjusting the opening of the electronic expansion valve according to the target opening so that the difference value between the actual temperature of the test chamber and the set temperature of the test chamber is within a preset difference value range.
S304, maintaining the current opening of the electronic expansion valve for a second preset time.
S305, acquiring a first actual exhaust gas temperature value of the compressor at a first moment and a second actual exhaust gas temperature value of the compressor at a second moment.
Specifically, the first actual discharge temperature value of the compressor 110 at the first moment is the first actual discharge temperature value of the compressor at the current moment, and then the second actual discharge temperature value of the compressor 110 at the second moment is obtained after the refrigeration system is operated for a period of time. By obtaining the first actual discharge temperature value of the compressor 110 at the first time and the second actual discharge temperature value of the compressor 110 at the second time, it is convenient to determine a time-dependent discharge temperature change relationship of the compressor 110, i.e. determine a discharge temperature change trend of the compressor 110.
S306, determining an exhaust temperature range in which the first actual exhaust temperature value or the second actual exhaust temperature value is located.
Specifically, the exhaust temperature range is a plurality of ranges between the exhaust temperature minimum value and the exhaust temperature maximum value, the exhaust temperature maximum value tp_pv-max and the exhaust temperature minimum value tp_pv-min are determined through testing, and at least one intermediate exhaust temperature value tp_pv-m1 is set; wherein TP_pv-min is less than or equal to TP_pv-m1 is less than or equal to TP_pv-max; the exhaust gas temperature range is divided into at least two ranges and the exhaust gas temperature range in which the first actual exhaust gas temperature value or the second actual exhaust gas temperature value is located is determined by comparing the second actual exhaust gas temperature value or the first actual exhaust gas temperature value with a boundary value of the exhaust gas temperature range.
S307, determining the change relation of the actual exhaust temperature value along with time according to the ratio of the first temperature difference value of the second actual exhaust temperature value and the first actual exhaust temperature value to the first period; the first period is a time difference between the second time and the first time.
Specifically, according to the ratio of the first temperature difference value of the second actual exhaust gas temperature value and the first actual exhaust gas temperature value to the first period, the change rate of the actual exhaust gas temperature value may be determined, so as to determine the change relation of the actual exhaust gas temperature value with time, that is, determine the change trend of the actual exhaust gas temperature value.
S308, controlling the opening or closing of the liquid spraying valve according to the exhaust temperature range of the actual exhaust temperature value of the compressor and the change relation of the actual exhaust temperature value along with time.
Specifically, if the boundary value of the exhaust temperature range in which the actual exhaust temperature value of the compressor 110 is located is large, and is close to the maximum exhaust temperature value, and the change relationship of the actual exhaust temperature value with time is that the change relationship with time is that the actual exhaust temperature value of the compressor 110 is large, and the actual exhaust temperature value is in an ascending trend, the spray valve 210 is controlled to be opened to perform spray cooling. If the boundary value of the discharge temperature range in which the actual discharge temperature value of the compressor 110 is located is smaller, and approaches the minimum discharge temperature value, and the change relationship of the actual discharge temperature value with time is that the change relationship with time is decreasing, which indicates that the actual discharge temperature value of the compressor 110 is smaller, and the actual discharge temperature value is in a decreasing trend, the liquid spraying valve 210 is controlled to be closed, so as to avoid the liquid impact of the compressor 110 caused by excessive liquid spraying. By controlling the opening or closing of the liquid spraying valve 210 according to the exhaust temperature range where the actual exhaust temperature value of the compressor 110 is located and the change relation of the actual exhaust temperature value with time, the liquid spraying valve 210 is opened as required, so that the phenomenon that liquid impact occurs to the compressor 110 due to excessive liquid spraying is avoided, and the reliability of the refrigerating system is improved.
It should be noted that, the step of controlling the opening or closing of the liquid spraying valve 210 may be performed after the opening adjustment of the electronic expansion valve 130 is completed, or may be performed simultaneously with the step of controlling the opening adjustment of the electronic expansion valve 130, and the flowchart in fig. 5 illustrates that the step of controlling the opening or closing of the liquid spraying valve 210 is performed after the opening adjustment of the electronic expansion valve 130, but the execution sequence is not limited.
On the basis of the above technical solution, optionally, S308, controlling opening or closing of the liquid spraying valve according to an exhaust temperature range in which an actual exhaust temperature value of the compressor is located and a change relationship of the actual exhaust temperature value with time, includes:
a1, dividing a temperature value between an exhaust temperature minimum value and an exhaust temperature maximum value into a first exhaust temperature range and a second exhaust temperature range; the first exhaust temperature range is from the minimum exhaust temperature to the intermediate exhaust temperature, and the second exhaust temperature range is from the intermediate exhaust temperature to the maximum exhaust temperature.
Specifically, by setting one exhaust temperature intermediate value, a first exhaust temperature range [ TP_pv-min, TP_pv-m1] and a second exhaust temperature range [ TP_pv-m1, TP_pv-max ] are obtained. The exhaust temperature range in which the second actual exhaust temperature value is located is determined by comparing the first actual exhaust temperature value or the second actual exhaust temperature value with tp_pv-min, tp_pv-m1, and tp_pv-max.
And a2, if the actual exhaust temperature value is in the first exhaust temperature range and the change relation of the actual exhaust temperature value with time is that the change relation of the actual exhaust temperature value with time is reduced, controlling the liquid spraying valve to be closed.
Specifically, if the actual exhaust temperature value of the compressor 110 is in the first exhaust temperature range and the time-varying relationship of the actual exhaust temperature value decreases with time, which indicates that the actual exhaust temperature value of the compressor 110 is smaller and the actual exhaust temperature value is in a decreasing trend, the liquid spraying valve 210 is controlled to be closed, so as to avoid liquid impact of the compressor 110 caused by excessive liquid spraying.
And a3, if the actual exhaust temperature value is in the second exhaust temperature range and the change relation of the actual exhaust temperature value with time is that the actual exhaust temperature value is changed with time and is increased, controlling the opening of the liquid spraying valve.
Specifically, if the actual exhaust temperature value of the compressor 110 is in the second exhaust temperature range and the change relationship of the actual exhaust temperature value with time is that the change relationship with time is that the actual exhaust temperature value of the compressor 110 is larger and the actual exhaust temperature value is in an ascending trend, the spray valve 210 is controlled to be opened to perform spray cooling.
In another implementation, fig. 6 is a flowchart of yet another control method of a refrigeration system according to an embodiment of the present invention, optionally, referring to fig. 3 and fig. 6, the control method of a refrigeration system includes:
S401, updating the target opening of the electronic expansion valve when the duration of maintaining the current actual temperature of the test chamber of the refrigeration system is greater than or equal to the first preset duration or the duration of maintaining the current opening of the electronic expansion valve is greater than or equal to the second preset duration.
S402, judging that a first difference value between the actual temperature of the test chamber and the outlet temperature of the evaporator is larger than or equal to a first temperature judgment value and smaller than or equal to a second temperature judgment value; if not, executing step S403; if yes, go to step S404.
S403, adjusting the opening of the electronic expansion valve according to the target opening so that the difference value between the actual temperature of the test chamber and the set temperature of the test chamber is within a preset difference value range.
S404, maintaining the current opening of the electronic expansion valve for a second preset time.
S405, acquiring a first actual suction temperature value of the compressor at a third moment and a second actual suction temperature value of the compressor at a fourth moment.
Specifically, the first actual suction temperature value of the compressor 110 at the third time is the first actual suction temperature value of the compressor at the current time, and then the second actual suction temperature value of the compressor 110 at the fourth time is obtained after the refrigeration system is operated for a period of time. By acquiring the first actual suction air temperature value of the compressor 110 at the third moment and the second actual suction air temperature value of the compressor 110 at the fourth moment, the change relation of the suction air temperature of the compressor 110 along with time, namely the suction air temperature change trend of the compressor 110, is conveniently determined.
S406, determining an air suction temperature range in which the first actual air suction temperature or the second actual air suction temperature value is located.
Specifically, the suction temperature range is a plurality of ranges from the suction temperature minimum value to the suction temperature maximum value, the suction temperature maximum value TX_pv-max and the suction temperature minimum value TX_pv-min are determined through testing, and at least one intermediate suction temperature value TX_pv-m1 is set; wherein TX_pv-min is less than or equal to TX_pv-m1 is less than or equal to TX_pv-max; the suction temperature range is divided into at least two ranges and the suction temperature range in which the first or second actual suction temperature value is located is determined by comparing the second or first actual suction temperature value with a boundary value of the suction temperature range.
S407, determining the change relation of the actual air suction temperature value along with time according to the ratio of the second temperature difference value of the second actual air suction temperature value and the first actual air suction temperature value to the second period; the second period is a time difference between the fourth time and the third time.
Specifically, according to the ratio of the second temperature difference value between the second actual air suction temperature value and the first actual air suction temperature value to the second period, the change rate of the actual air suction temperature value can be determined, so that the change relation of the actual air suction temperature value along with time, namely, the change trend of the actual air suction temperature value, is determined.
S408, controlling the opening or closing of the liquid spraying valve according to the suction temperature range where the actual suction temperature value of the compressor is and the change relation of the actual suction temperature value along with time.
Specifically, if the boundary value of the suction temperature range in which the actual suction temperature value of the compressor 110 is located is large, and is close to the maximum suction temperature value, and the time-dependent change of the actual suction temperature value increases, which indicates that the actual suction temperature value of the compressor 110 is large, and the actual suction temperature value is in an ascending trend, the spray valve 210 is controlled to be opened to perform spray cooling. If the boundary value of the suction temperature range in which the actual suction temperature value of the compressor 110 is located is smaller, and approaches the minimum value of the suction temperature, and the time-varying relationship of the actual suction temperature value decreases with time, which indicates that the actual suction temperature value of the compressor 110 is smaller, and the actual suction temperature value is in a decreasing trend, the liquid spraying valve 210 is controlled to be closed, so as to avoid liquid impact of the compressor 110 caused by excessive liquid spraying. By controlling the opening or closing of the liquid spraying valve 210 according to the suction temperature range where the actual suction temperature value of the compressor 110 is located and the change relation of the actual suction temperature value with time, the liquid spraying valve 210 is opened as required, so that the phenomenon that liquid impact occurs to the compressor 110 due to excessive liquid spraying is avoided, and the reliability of the refrigerating system is improved.
It should be noted that, the step of controlling the opening or closing of the liquid spraying valve 210 may be performed after the opening adjustment of the electronic expansion valve 130 is completed, or may be performed simultaneously with the step of controlling the opening adjustment of the electronic expansion valve 130, and the flowchart in fig. 6 illustrates that the step of controlling the opening or closing of the liquid spraying valve 210 is performed after the opening adjustment of the electronic expansion valve 130, but the execution sequence is not limited.
Optionally, S408, controlling opening or closing of the liquid spraying valve according to an air suction temperature range in which an actual air suction temperature value of the compressor is located and a change relationship of the actual air suction temperature value with time, including:
step b1, dividing a temperature value between an air suction temperature minimum value and an air suction temperature maximum value into a first air suction temperature range and a second air suction temperature range; the first air suction temperature range is from the minimum air suction temperature to the middle air suction temperature, and the second air suction temperature range is from the middle air suction temperature to the maximum air suction temperature.
Specifically, by setting an intermediate value of the suction temperature TX_pv-m1, a first suction temperature range [ TX_pv-min, TX_pv-m1] and a second suction temperature range [ TX_pv-m1, TX_pv-max ] are obtained. The suction temperature range in which the second actual suction temperature value is located is determined by comparing the first actual suction temperature value or the second actual suction temperature value with tx_pv-min, tx_pv-m1, and tx_pv-max.
And b2, if the actual air suction temperature value is in the first air suction temperature range and the time-dependent change of the actual air suction temperature value is reduced, controlling the liquid spraying valve to be closed.
Specifically, if the actual suction temperature value of the compressor 110 is in the first suction temperature range and the time-varying relationship of the actual suction temperature value decreases with time, which indicates that the actual suction temperature value of the compressor 110 is smaller and the actual suction temperature value is in a decreasing trend, the liquid spraying valve 210 is controlled to be closed, so as to avoid liquid impact of the compressor 110 caused by excessive liquid spraying.
And b3, if the actual air suction temperature value is in the second air suction temperature range and the time-dependent change of the actual air suction temperature value is that the time-dependent change of the actual air suction temperature value is increased, controlling the opening of the liquid spraying valve.
Specifically, if the actual suction temperature value of the compressor 110 is in the second suction temperature range and the time-varying relationship of the actual suction temperature value increases with time, which indicates that the actual suction temperature value of the compressor 110 is relatively large and the actual suction temperature value is in an ascending trend, the spray valve 210 is controlled to be opened to perform spray cooling.
In another implementation, fig. 7 is a flowchart of yet another refrigeration system control method according to an embodiment of the present invention, optionally, referring to fig. 3 and fig. 7, the refrigeration system control method includes:
S501, updating the target opening of the electronic expansion valve when the duration of maintaining the current actual temperature of the test chamber of the refrigeration system is greater than or equal to the first preset duration or the duration of maintaining the current opening of the electronic expansion valve is greater than or equal to the second preset duration.
S502, judging that a first difference value between the actual temperature of the test chamber and the outlet temperature of the evaporator is larger than or equal to a first temperature judgment value and smaller than or equal to a second temperature judgment value; if not, executing step S503; if yes, go to step S504.
S503, adjusting the opening of the electronic expansion valve according to the target opening so that the difference value between the actual temperature of the test chamber and the set temperature of the test chamber is within a preset difference value range.
S504, maintaining the current opening of the electronic expansion valve for a second preset time.
S505, controlling the opening or closing of a liquid spraying valve according to a first deviation range of a second difference value between an actual exhaust temperature value and a target exhaust temperature value of the compressor under the current working condition; the current working condition comprises the actual temperature of the test chamber and the current environment temperature of the environment where the refrigerating system is located.
Specifically, under different working conditions, when the first deviation range where the second difference value is located is the same, the target states of the liquid spraying valves may be the same or may be different, so that the liquid spraying valves need to be controlled to be opened or closed according to the current working condition and the first deviation range where the second difference value is located. For example, when the current ambient temperature is 10deg.C, the actual temperature of the test chamber is 100deg.C, and the first deviation range of the second difference is [5,15], the actual temperature of the test chamber is too high, and the second difference is larger, so as to control the opening of the liquid spraying valve 210. When the current ambient temperature is 10deg.C, the actual temperature of the test chamber is 20deg.C, and the first deviation range of the second difference value is [5,15], the actual temperature of the test chamber is smaller, the second difference value is larger, and the liquid spraying valve 210 is controlled to be closed. Therefore, the liquid spraying valve 210 can be controlled to be opened or closed more accurately according to the current working condition and the first deviation range where the second difference value is located, so as to further avoid the liquid impact of the compressor 110 and further improve the accuracy and reliability of the refrigeration system.
It should be noted that, the step of controlling the opening or closing of the liquid spraying valve 210 may be performed after the opening adjustment of the electronic expansion valve 130 is completed, or may be performed simultaneously with the step of controlling the opening adjustment of the electronic expansion valve 130, and the flowchart in fig. 7 illustrates that the step of controlling the opening or closing of the liquid spraying valve 210 is performed after the opening adjustment of the electronic expansion valve 130, but the execution sequence is not limited.
Optionally, S505, controlling the liquid spraying valve to open or close according to a first deviation range where a second difference between an actual discharge temperature value and a target discharge temperature value of the compressor is located under the current working condition, including:
step c1, determining a first deviation range of a second difference value between the actual exhaust gas temperature value and the target exhaust gas temperature value of the compressor.
Specifically, the first deviation ranges are, for example, [0,5], [5,15] and [15,25], and the second difference is compared with the boundary value of the first deviation range to determine the first deviation range in which the second difference is located, so that the liquid spraying valve 210 is controlled to be opened or closed according to the first deviation range in which the second difference is located.
Step c2, searching a target state of the liquid spraying valve corresponding to the first deviation range under the current working condition from the first preset relation; the first preset relationship is a corresponding relationship between an actual temperature, a current environment temperature, a first deviation range and a target state.
Specifically, for example, the corresponding relationship between the actual temperature of the test chamber, the current environmental temperature, the first deviation range and the target state of the liquid spraying valve may be predetermined and stored in an experimental manner as a first preset relationship, and may be stored in a table or a curve, and when the first deviation range in which the current working condition and the second difference value are located is determined, the target state of the corresponding liquid spraying valve 210 is directly searched from the first preset relationship. Wherein the target state includes the liquid spray valve 210 being opened or the liquid spray valve 210 being closed. Table 1 is a schematic table of a first preset relationship, and as shown in table 1, according to the determined actual temperature of the test chamber, the actual temperature, the current ambient temperature and the first deviation range where the second difference value is located can be determined, and the target state of the liquid spraying valve can be found.
TABLE 1 schematic table of first preset relationship
And c3, controlling the opening or closing of the liquid spraying valve according to the target state.
Specifically, the liquid spraying valve 210 is controlled to be opened or closed according to the target state found in the first preset relationship, so that accurate control of the liquid spraying valve 210 is realized, liquid impact of the compressor 110 is further avoided, and accuracy and reliability of the refrigeration system are further improved.
In another implementation, fig. 8 is a flowchart of yet another refrigeration system control method according to an embodiment of the present invention, optionally, referring to fig. 3 and fig. 8, the refrigeration system control method includes:
And S601, updating the target opening of the electronic expansion valve when the duration of maintaining the current actual temperature of the test chamber of the refrigeration system is greater than or equal to the first preset duration or the duration of maintaining the current opening of the electronic expansion valve is greater than or equal to the second preset duration.
S602, judging that a first difference value between the actual temperature of the test chamber and the outlet temperature of the evaporator is larger than or equal to a first temperature judgment value and smaller than or equal to a second temperature judgment value; if not, go to step S603; if yes, go to step S604.
S603, adjusting the opening of the electronic expansion valve according to the target opening so that the difference value between the actual temperature of the test chamber and the set temperature of the test chamber is within a preset difference value range.
S604, maintaining the current opening of the electronic expansion valve for a second preset time.
S605, controlling the opening or closing of a liquid spraying valve according to a second deviation range of a third difference value between an actual air suction temperature value and a target air suction temperature value of the compressor under the current working condition; the current working condition comprises the actual temperature of the test chamber and the current environment temperature of the environment where the refrigerating system is located.
Specifically, under different working conditions, when the second deviation range where the third difference value is located is the same, the target states of the liquid spraying valves may be the same or may be different, so that the liquid spraying valves need to be controlled to be opened or closed according to the current working condition and the second deviation range where the third difference value is located.
It should be noted that, the step of controlling the opening or closing of the liquid spraying valve 210 may be performed after the opening adjustment of the electronic expansion valve 130 is completed, or may be performed simultaneously with the step of controlling the opening adjustment of the electronic expansion valve 130, and the flowchart in fig. 8 illustrates that the step of controlling the opening or closing of the liquid spraying valve 210 is performed after the opening adjustment of the electronic expansion valve 130, but the execution sequence is not limited.
Optionally, S605, controlling opening or closing of the liquid spraying valve according to a second deviation range where a third difference between the actual suction temperature value and the target suction temperature value of the compressor is located under the current working condition, including:
step d1, determining a second deviation range of a third difference value between the actual suction air temperature value and the target suction air temperature value of the compressor.
Specifically, the second deviation ranges are, for example, [0,5], [5,15] and [15,25], and the third difference value is compared with the boundary value of the second deviation range to determine the second deviation range in which the third difference value is located, so that the liquid spraying valve 210 is controlled to be opened or closed according to the second deviation range in which the third difference value is located.
Step d2, searching a target state of the liquid spraying valve corresponding to a second deviation range under the current working condition from a second preset relation; the second preset relationship is a corresponding relationship between the actual temperature, the current ambient temperature, the second deviation range and the target state.
Specifically, for example, the corresponding relationship between the actual temperature of the test chamber, the current environmental temperature, the second deviation range and the target state of the liquid spraying valve may be predetermined and stored in an experimental manner as a second preset relationship, and may be stored in a table or a curve, and when the second deviation range in which the current working condition and the third difference value are located is determined, the target state of the corresponding liquid spraying valve 210 is directly searched from the second preset relationship. Wherein the target state includes the liquid spray valve 210 being opened or the liquid spray valve 210 being closed.
And d3, controlling the opening or closing of the liquid spraying valve according to the target state.
Specifically, the liquid spraying valve 210 is controlled to be opened or closed according to the target state found in the first preset relationship, so that accurate control of the liquid spraying valve 210 is realized, liquid impact of the compressor 110 is further avoided, and accuracy and reliability of the refrigeration system are further improved.
Optionally, referring to fig. 3, the refrigeration system further includes a hot gas bypass compensating path, which is connected between the outlet of the compressor 110 and the inlet of the evaporator 140, and includes a hot gas valve 310 and a second capillary tube 320.
Optionally, the refrigeration system control method further includes:
And when the actual temperature of the test chamber is smaller than the preset temperature of the test chamber, controlling the hot air valve to be opened.
Specifically, when the actual temperature of the test chamber 150 is less than the preset temperature of the test chamber 150, it indicates that the actual temperature in the test chamber 150 is too low, and the hot air valve 310 needs to be controlled to be opened, the hot air valve 310 enters the evaporator 140 through the second capillary 320, so as to raise the actual temperature of the test chamber 150, and avoid the poor oil return of the compressor 110 caused by too low pressure of the evaporator 140, thereby further avoiding the oil shortage problem of the compressor 110.
And when the actual temperature is greater than or equal to the preset temperature, the hot gas valve is controlled to be closed.
Specifically, when the actual temperature of the test chamber 150 is greater than or equal to the preset temperature, it indicates that the actual temperature in the test chamber 150 is higher, and the hot gas valve 310 is controlled to close without supplementing hot gas.
In other embodiments, the hot gas valve 310 may be controlled according to the control method of the electronic expansion valve 130 in any of the above embodiments.
Fig. 9 is a schematic structural diagram of a control device for a refrigeration system according to an embodiment of the present invention, as shown in fig. 9, the device includes: the target opening updating module 701, the opening adjusting module 702 and the opening maintaining module 703, wherein the target opening updating module 701 is configured to update the target opening of the electronic expansion valve when the duration of maintaining the current actual temperature of the test chamber of the refrigeration system is greater than or equal to a first preset duration, or the duration of maintaining the current opening of the electronic expansion valve is greater than or equal to a second preset duration; the opening adjustment module 702 is configured to adjust the opening of the electronic expansion valve according to the target opening when the first difference between the actual temperature of the test chamber and the outlet temperature of the evaporator is smaller than the first temperature determination value or the first difference is larger than the second temperature determination value, so that the difference between the actual temperature of the test chamber and the set temperature of the test chamber is within a preset difference range; the opening maintaining module 703 is configured to maintain the current opening of the electronic expansion valve for a second preset duration when the first difference is greater than or equal to the first temperature determination value and less than or equal to the second temperature determination value.
Optionally, the refrigeration system control device further comprises a liquid spraying valve control module, wherein the liquid spraying valve control module is used for controlling the opening or closing of the liquid spraying valve according to the exhaust temperature range where the actual exhaust temperature value of the compressor is and the change relation of the actual exhaust temperature value along with time; and/or controlling the opening or closing of the liquid spraying valve according to the suction temperature range where the actual suction temperature value of the compressor is and the change relation of the actual suction temperature value along with time.
Optionally, the liquid spraying valve control module is further used for controlling the liquid spraying valve to be opened or closed according to a first deviation range where a second difference value between an actual exhaust temperature value and a target exhaust temperature value of the compressor is located under the current working condition; the current working condition comprises the actual temperature of the test chamber and the current environment temperature of the environment where the refrigerating system is positioned; and/or controlling the opening or closing of the liquid spraying valve according to a second deviation range of a third difference value between the actual air suction temperature value and the target air suction temperature value under the current working condition.
Optionally, the refrigeration system control device further comprises a hot air valve control module, wherein the hot air valve control module is used for controlling the hot air valve to be opened when the actual temperature of the test chamber is smaller than the preset temperature of the test chamber; and when the actual temperature is greater than or equal to the preset temperature, the hot gas valve is controlled to be closed.
The refrigerating system control device provided by the embodiment of the invention can execute the refrigerating system control method provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method.
The technical solution of the embodiment of the present invention further provides a battery testing device, and fig. 10 is a schematic structural diagram of the battery testing device provided by the embodiment of the present invention, and referring to fig. 3 and fig. 10, the battery testing device includes a battery testing device 801, a refrigeration system 802, and a refrigeration system control device 803 provided by any of the foregoing embodiments; the battery testing device 801 is connected with the power battery 804, and the battery testing device 801 is used for acquiring parameter information of the power battery 804 at different temperatures; a refrigeration system control device 803 is connected to the refrigeration system 802, and the refrigeration system control device 803 is configured to control the refrigeration system 802 to operate when the temperature of the power battery 804 is greater than a temperature threshold.
The refrigeration system 802 is the refrigeration system shown in fig. 3, and as shown in fig. 3, the refrigeration system 802 further includes a main solenoid valve 160, and the condenser 120 is connected to the electronic expansion valve 130 through the main solenoid valve 160. By providing the main solenoid valve 160, when the refrigeration system is stopped, the main solenoid valve 160 is closed, and even if the electronic expansion valve 130 is opened, the refrigerant is not accumulated on the low pressure side, so that the problems of liquid impact and oil shortage of the compressor 110 are further avoided. The refrigeration system 802 also includes a heater 170, where the heater 170 heats when the test chamber temperature is low, allowing for a counter-flushing adjustment of the amount of cold to maintain the test chamber temperature at a relatively constant state. A pressure gauge or sensor may also be provided in the refrigeration system 802 to monitor the pressure in the pipeline.
Specifically, when the power battery 804 is tested, the battery testing device 801 controls the power battery 804 to charge and discharge, and by setting the ambient temperature of the power battery 804, the battery testing device 801 obtains parameter information of the power battery 804 at different temperatures, for example, temperature information, current information, voltage information, battery remaining power information, and the like, so as to test the battery quality, charge and discharge performance, life, and long-term reliability. The battery testing device 801 is connected with the refrigerating system control device 803, the battery testing device 801 can send temperature information of the power battery 804 to the refrigerating system control device 803, and when the temperature of the power battery 804 is greater than a temperature threshold in the testing process, the refrigerating system control device 803 controls the refrigerating system 802 to operate, so that the temperature is reduced, the scene of the power battery 804 when the power battery 804 is actually applied is restored, and the testing accuracy of the power battery 804 is improved.
And, when the first difference between the actual temperature of the test chamber 150 and the outlet temperature of the evaporator is smaller than the first temperature determination value, or the first difference is larger than the second temperature determination value, the refrigeration system control device 803 adjusts the opening of the electronic expansion valve 130 according to the target opening, so that the opening of the electronic expansion valve 130 reaches the target opening, and the difference between the actual temperature of the test chamber 150 and the set temperature of the test chamber is within the preset difference range. Therefore, the opening degree of the electronic expansion valve 130 is controlled according to the actual demand, so that the opening degree of the electronic expansion valve 130 is maintained in a proper state, thereby avoiding the problems of liquid impact and oil shortage of the compressor 110. The refrigeration system control device 803 controls the liquid spraying valve 210 to be opened or closed according to the exhaust temperature range in which the actual exhaust temperature value of the compressor 110 is located and the change relation of the actual exhaust temperature value with time, or the refrigeration system control device 803 controls the liquid spraying valve 210 to be opened or closed according to the suction temperature range in which the actual suction temperature value of the compressor 110 is located and the change relation of the actual suction temperature value with time, so that the liquid spraying valve 210 is opened as required, liquid spraying is prevented from being excessively performed to cause liquid impact of the compressor 110, and reliability of the refrigeration system is improved.
In summary, the opening degree of the electronic expansion valve 130 is controlled by the refrigerating system control device 803 according to the requirement, and the liquid spraying valve 210 is controlled to be opened or closed according to the requirement, so that the problems of liquid impact and oil shortage of the compressor 110 caused by excessive liquid spraying are avoided, the refrigerating system 802 works normally, the battery test equipment operates normally, and the accuracy of testing the power battery 804 is improved.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.

Claims (10)

1. A method of controlling a refrigeration system, wherein the refrigeration system comprises a refrigeration main; the refrigeration main path comprises a compressor, a condenser, an electronic expansion valve and an evaporator which are sequentially connected in series; the evaporator is positioned in the test chamber;
The control method comprises the following steps:
updating the target opening of the electronic expansion valve when the duration of maintaining the current actual temperature of the test chamber by the refrigeration system is greater than or equal to a first preset duration or the duration of maintaining the current opening of the electronic expansion valve is greater than or equal to a second preset duration;
when the first difference value between the actual temperature of the test chamber and the outlet temperature of the evaporator is smaller than a first temperature judgment value or the first difference value is larger than a second temperature judgment value, the opening of the electronic expansion valve is adjusted according to the target opening, so that the difference value between the actual temperature of the test chamber and the set temperature of the test chamber is within a preset difference value range;
when the first difference value is greater than or equal to the first temperature judgment value and less than or equal to the second temperature judgment value, the electronic expansion valve maintains the current opening for a second preset time period;
the refrigerating system also comprises a liquid spraying supplementing path; the liquid spraying compensation path is connected between the inlet of the compressor and the inlet of the evaporator and comprises a liquid spraying valve and a first capillary tube which are connected in series;
the control method further includes:
determining a first deviation range in which a second difference between an actual discharge temperature value and a target discharge temperature value of the compressor is located;
Searching a target state of the liquid spraying valve corresponding to the first deviation range under the current working condition from a first preset relation; the current working condition comprises the actual temperature of the test chamber and the current environment temperature of the environment where the refrigerating system is located, and the first preset relationship is the corresponding relationship among the actual temperature, the current environment temperature, the first deviation range and the target state;
controlling the liquid spraying valve to be opened or closed according to the target state;
and/or the number of the groups of groups,
determining a second deviation range in which a third difference between the actual suction temperature value and the target suction temperature value of the compressor is located;
searching a target state of the liquid spraying valve corresponding to the second deviation range under the current working condition from a second preset relation; the second preset relationship is a corresponding relationship between the actual temperature, the current environment temperature, the second deviation range and the target state;
and controlling the opening or closing of the liquid spraying valve according to the target state.
2. The method of claim 1, wherein adjusting the opening of the electronic expansion valve according to the target opening to bring the difference between the actual temperature of the test chamber and the set temperature of the test chamber within a preset difference range when the first difference between the actual temperature of the test chamber and the evaporator outlet temperature is less than a first temperature determination value or the first difference is greater than a second temperature determination value, comprises:
When the first difference value is smaller than a first temperature judgment value, reducing the opening of the electronic expansion valve according to the opening adjustment rate until the opening of the electronic expansion valve reaches the target opening, so that the difference value between the actual temperature of the test chamber and the set temperature of the test chamber is within a preset difference value range;
and when the first difference value is larger than a second temperature judgment value, the opening of the electronic expansion valve is lifted according to the opening adjustment rate until the opening of the electronic expansion valve reaches the target opening, so that the difference value between the actual temperature of the test chamber and the set temperature of the test chamber is within a preset difference value range.
3. The method according to claim 2, wherein, when the first difference is smaller than a first temperature determination value, before decreasing the opening of the electronic expansion valve according to an opening adjustment rate, further comprising:
and calculating the opening adjustment rate of the electronic expansion valve according to the target opening, the current opening of the electronic expansion valve, the starting time of the opening adjustment of the electronic expansion valve and the ending time of the opening adjustment of the electronic expansion valve.
4. The method of claim 1, wherein the control method further comprises:
Controlling the opening or closing of the liquid spraying valve according to the exhaust temperature range of the actual exhaust temperature value of the compressor and the change relation of the actual exhaust temperature value along with time;
and/or controlling the opening or closing of the liquid spraying valve according to the suction temperature range of the actual suction temperature value of the compressor and the change relation of the actual suction temperature value along with time.
5. The method of claim 4, further comprising, before controlling the liquid spray valve to open or close according to a discharge temperature range in which an actual discharge temperature value of the compressor is located and a change relation of the actual discharge temperature value with time:
acquiring a first actual exhaust temperature value of the compressor at a first moment and a second actual exhaust temperature value of the compressor at a second moment;
determining an exhaust temperature range in which the first or second actual exhaust temperature values are located;
determining a change relation of the actual exhaust temperature value along with time according to a ratio of a first temperature difference value of the second actual exhaust temperature value and the first actual exhaust temperature value to a first period of time; wherein the first period is a time difference between the second time and the first time;
Before controlling the opening or closing of the liquid spraying valve according to the suction temperature range where the actual suction temperature value of the compressor is and the change relation of the actual suction temperature value with time, the liquid spraying valve further comprises:
acquiring a first actual air suction temperature value of the compressor at a third time and a second actual air suction temperature value of the compressor at a fourth time;
determining an air suction temperature range in which the first actual air suction temperature or the second actual air suction temperature value is located;
determining a change relation of the actual air suction temperature value along with time according to a ratio of a second temperature difference value of the second actual air suction temperature value and the first actual air suction temperature value to a second period of time; wherein the second period is a time difference between the fourth time and the third time.
6. The method of claim 4, wherein said controlling the opening or closing of the liquid spray valve according to a discharge temperature range in which an actual discharge temperature value of the compressor is located and a change relation of the actual discharge temperature value with time, comprises:
dividing a temperature value between the exhaust gas temperature minimum value and the exhaust gas temperature maximum value into a first exhaust gas temperature range and a second exhaust gas temperature range; wherein the first exhaust temperature range is from the exhaust temperature minimum value to an exhaust temperature intermediate value, and the second exhaust temperature range is from the exhaust temperature intermediate value to the exhaust temperature maximum value;
If the actual exhaust temperature value is in the first exhaust temperature range and the change relation of the actual exhaust temperature value with time is that the change relation of the actual exhaust temperature value with time is reduced, the liquid spraying valve is controlled to be closed;
and if the actual exhaust temperature value is in the second exhaust temperature range and the change relation of the actual exhaust temperature value with time is that the actual exhaust temperature value is increased with time, controlling the liquid spraying valve to be opened.
7. The method of claim 4, wherein said controlling the opening or closing of the liquid spray valve according to a suction temperature range in which an actual suction temperature value of the compressor is located and a time-dependent relationship of the actual suction temperature value, comprises:
dividing a temperature value between the minimum suction temperature value and the maximum suction temperature value into a first suction temperature range and a second suction temperature range; the first air suction temperature range is from the minimum air suction temperature to the middle air suction temperature, and the second air suction temperature range is from the middle air suction temperature to the maximum air suction temperature;
if the actual air suction temperature value is in the first air suction temperature range and the change relation of the actual air suction temperature value with time is that the change relation of the actual air suction temperature value with time is reduced, the liquid spraying valve is controlled to be closed;
And if the actual air suction temperature value is in the second air suction temperature range and the change relation of the actual air suction temperature value with time is that the actual air suction temperature value is increased with time, controlling the opening of the liquid spraying valve.
8. The method of claim 1, wherein the refrigeration system further comprises a hot gas bypass make-up connected between the outlet of the compressor and the inlet of the evaporator, the hot gas bypass make-up comprising a hot gas valve and a second capillary tube;
the control method further includes:
when the actual temperature of the test chamber is smaller than the preset temperature of the test chamber, the hot gas valve is controlled to be opened;
and when the actual temperature is greater than or equal to the preset temperature, controlling the hot gas valve to be closed.
9. A refrigeration system control device, wherein the refrigeration system comprises a refrigeration main circuit; the refrigeration main path comprises a compressor, a condenser, an electronic expansion valve and an evaporator which are sequentially connected in series; the evaporator is positioned in the test chamber;
the refrigeration system control device includes:
the target opening updating module is used for updating the target opening of the electronic expansion valve when the duration of maintaining the current actual temperature of the test chamber of the refrigeration system is greater than or equal to a first preset duration or the duration of maintaining the current opening of the electronic expansion valve is greater than or equal to a second preset duration;
The opening adjusting module is used for adjusting the opening of the electronic expansion valve according to the target opening when the first difference value between the actual temperature of the test chamber and the outlet temperature of the evaporator is smaller than a first temperature judgment value or the first difference value is larger than a second temperature judgment value so that the difference value between the actual temperature of the test chamber and the set temperature of the test chamber is in a preset difference value range;
the opening maintaining module is used for maintaining the current opening of the electronic expansion valve for a second preset duration when the first difference value is larger than or equal to the first temperature judging value and smaller than or equal to the second temperature judging value;
the refrigerating system control device also comprises a liquid spraying valve control module, wherein the liquid spraying valve control module is used for:
determining a first deviation range in which a second difference between an actual discharge temperature value and a target discharge temperature value of the compressor is located;
searching a target state of the liquid spraying valve corresponding to the first deviation range under the current working condition from a first preset relation; the current working condition comprises the actual temperature of the test chamber and the current environment temperature of the environment where the refrigerating system is located, and the first preset relationship is the corresponding relationship among the actual temperature, the current environment temperature, the first deviation range and the target state;
Controlling the liquid spraying valve to be opened or closed according to the target state;
and/or the number of the groups of groups,
determining a second deviation range in which a third difference between the actual suction temperature value and the target suction temperature value of the compressor is located;
searching a target state of the liquid spraying valve corresponding to the second deviation range under the current working condition from a second preset relation; the second preset relationship is a corresponding relationship between the actual temperature, the current environment temperature, the second deviation range and the target state;
and controlling the opening or closing of the liquid spraying valve according to the target state.
10. A power battery testing apparatus comprising a battery testing device, a refrigeration system, and the refrigeration system control device of claim 9;
the battery testing device is connected with the power battery and is used for acquiring parameter information of the power battery at different temperatures;
the refrigerating system control device is connected with the refrigerating system and is used for controlling the refrigerating system to operate when the temperature of the power battery is greater than a temperature threshold value.
CN202310431831.3A 2022-12-01 2022-12-01 Refrigerating system control method and device and power battery test equipment Pending CN116465108A (en)

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CN112414000B (en) * 2021-01-25 2021-06-22 北京京仪自动化装备技术股份有限公司 Temperature control system and control method thereof
CN112414001B (en) * 2021-01-25 2021-06-22 北京京仪自动化装备技术股份有限公司 Temperature control system for semiconductor and control method thereof
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CN118131062A (en) * 2024-05-07 2024-06-04 宁德时代新能源科技股份有限公司 Testing device for heat exchange piece and control method thereof
CN118131062B (en) * 2024-05-07 2024-08-30 宁德时代新能源科技股份有限公司 Testing device for heat exchange piece and control method thereof

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