CN109556306B - Circulating refrigerant control device and method for refrigerated transport vehicle - Google Patents

Circulating refrigerant control device and method for refrigerated transport vehicle Download PDF

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Publication number
CN109556306B
CN109556306B CN201811351523.5A CN201811351523A CN109556306B CN 109556306 B CN109556306 B CN 109556306B CN 201811351523 A CN201811351523 A CN 201811351523A CN 109556306 B CN109556306 B CN 109556306B
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controller
input
communicated
compressor
output
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CN109556306A (en
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冯正发
王云
徐杰
童卫东
张海华
王丽平
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Nanjing Automobile Group Corp
SAIC Maxus Vehicle Co Ltd Nanjing Branch
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Nanjing Automobile Group Corp
SAIC Maxus Vehicle Co Ltd Nanjing Branch
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00357—Air-conditioning arrangements specially adapted for particular vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
    • B60H1/00814—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation
    • B60H1/00878—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation the components being temperature regulating devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/32—Cooling devices
    • B60H1/3204—Cooling devices using compression
    • B60H1/3205—Control means therefor
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/022—Compressor control arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
    • F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2513—Expansion valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2515—Flow valves
    • 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)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air-Conditioning For Vehicles (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)

Abstract

The invention discloses a circulating refrigerant control device and a control method for a refrigerated transport vehicle. The invention adopts the system active control, avoids the problems of low practical value caused by large system efficiency loss, large performance fluctuation and poor self-adaption of the existing solution, and effectively realizes the integration of the passenger compartment air conditioning refrigeration cycle system and the refrigerated container refrigeration cycle system.

Description

Circulating refrigerant control device and method for refrigerated transport vehicle
Technical Field
The invention relates to a circulating refrigerant control device and a control method, in particular to a circulating refrigerant control device and a control method for a refrigerated transport vehicle, and belongs to the field of design and manufacture of refrigeration equipment for vehicles.
Background
The refrigerated transport vehicle generally needs to be additionally provided with an independent refrigerated container refrigeration cycle device on the basis of a passenger compartment air conditioning refrigeration cycle device of the vehicle, so as to achieve the purpose of refrigerating a passenger compartment and a refrigerated container simultaneously. Thus, two independent refrigeration units are provided on the refrigerated transport vehicle, so that two compressors are provided on one refrigerated transport vehicle. The structure setting undoubtedly can lead to arranging the difficulty, and the dual compressor power load increases, and the automatically controlled load access control that only supports compressor of all the way of internal-combustion engine is automatically controlled, and the asynchronous access of dual compressor can bring the electronic control system to match the difficulty. The development difficulty may lead to the option of eliminating the passenger compartment air conditioning system, which is not in line with the driving requirements of modern drivers; and the impact of asynchronous work of the double compressors on the idle speed of the internal combustion engine is met, so that the idle speed can be increased or the discharge capacity can be increased, the development trend of energy conservation and environmental protection advocated in the current transportation industry is not met, and the cost of cold chain transportation is increased. In order to solve the above problems, it is an option to integrate two sets of refrigeration cycle systems and share a compressor. However, due to the difference between the refrigeration temperature of the cargo compartment and the passenger compartment and the flow resistance of the circulating refrigerant, the brought influence is extremely complex, the evaporator frosts due to the fact that most of the refrigerant flows to the passenger compartment through a simple one-to-two mode, and the refrigeration of the corresponding cargo compartment cannot be guaranteed.
In order to solve the problem, a one-to-two refrigerating unit for refrigerating transport vehicles (Chinese patent CN 205373124U) is provided, wherein a first one-way valve and a second one-way valve are added on the basis of basic one-to-two, the independent expansion and evaporation processes of double circulation are kept, but finally, the refrigerants on the low pressure side are accumulated to be consistent with the pressure on the low pressure side of a compressor, and the problem of reasonable flow distribution cannot be solved due to complex mutual influence; the problem of flow distribution is solved by connecting a cargo compartment evaporator and a passenger compartment evaporator in series by a refrigerating unit of a refrigerated transport vehicle and a cab air conditioning system (Chinese patent CN 2864520Y), but a new problem is brought, the refrigerant is a low-temperature low-pressure gaseous refrigerant after coming out of the refrigerating evaporator, an expansion valve of a front evaporator has limited action, and meanwhile, heat is absorbed through a pipeline, so that the evaporator has little cold energy when the low-temperature low-pressure gaseous refrigerant reaches the front evaporator, and the application significance is not great.
In summary, how to provide a new refrigerant circulation control device and method for a refrigerated transport vehicle based on the prior art, which overcome many defects in the prior art, and achieve sufficient integration of two sets of refrigeration cycle systems, is a problem to be solved by those skilled in the art.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a circulating refrigerant control device for a refrigerated transport vehicle and a control method thereof, wherein the circulating refrigerant control device can fully integrate two refrigerating circulating systems of a passenger cabin and a refrigerated container so as to control and adjust the double refrigerating systems on the refrigerated transport vehicle.
A circulating refrigerant control device for a refrigerated transport vehicle comprises a double-refrigerant circulating system, a controller and a compressor, wherein the double-refrigerant circulating system comprises a passenger compartment air conditioner refrigerant circulating system and a refrigerated container refrigerant circulating system; one path of the output of the compressor is communicated with the input of the passenger compartment air conditioner refrigerant circulating system, and the other path of the output of the compressor is communicated with the input of the refrigerated container refrigerant circulating system; an electronic expansion valve for controlling the flow of the refrigerant is arranged on a pipeline between the output of the compressor and the input of the refrigerant circulating system of the air conditioner of the passenger compartment; and a flow regulator for controlling the flow of the refrigerant is arranged on a pipeline between the output of the compressor and the input of the refrigerant circulating system of the refrigerated container.
Preferably, the passenger compartment air conditioning refrigerant circulating system comprises a condensation drying component, a pressure switch and a passenger compartment evaporator; the input of the condensation drying component is communicated with the output of the compressor, the output of the condensation drying component is communicated with the input of the pressure switch, one path of the output of the pressure switch is communicated with the input of the controller, the other path of the output of the pressure switch is communicated with the input of the passenger compartment evaporator, one path of the output of the passenger compartment evaporator is communicated with the input of the controller, and the other path of the output of the passenger compartment evaporator is communicated with the input of the compressor; the electronic expansion valve is arranged on a pipeline between the output of the pressure switch and the input of the passenger cabin evaporator, one path of the input of the electronic expansion valve is communicated with the output of the pressure switch, the other path of the input of the electronic expansion valve is communicated with the output of the controller, and the output of the electronic expansion valve is communicated with the input of the passenger cabin evaporator;
the refrigeration container refrigerant circulating system comprises a cargo compartment refrigeration unit and a refrigeration unit circuit, and the refrigeration unit circuit is electrically connected with the cargo compartment refrigeration unit; one path of the output of the compressor is communicated with the input of the controller, one path of the output of the compressor is communicated with the input of the condensation drying component, and the other path of the output of the compressor is communicated with the input of the cargo compartment refrigerating unit; the flow regulator is disposed on a conduit between an output of the compressor and an input of the cargo compartment refrigeration unit.
Preferably, an input of the flow regulator is in communication with an output of the compressor on one hand and with an output of the controller on the other hand, an output of the flow regulator is in communication with an input of the cargo compartment refrigeration unit, an output of the cargo compartment refrigeration unit is in communication with an input of the compressor, and an output of the refrigeration unit circuit is in communication with an input of the controller;
the refrigeration container refrigerant circulating system further comprises a cargo compartment temperature sensor, and the output of the cargo compartment temperature sensor is communicated with the input of the controller.
Preferably, an input of the flow regulator is communicated with an output of the compressor, one path of an output of the flow regulator is communicated with an input of the cargo compartment refrigerating unit, the other path of the output of the flow regulator is communicated with an input of the refrigerating unit circuit, an output of the cargo compartment refrigerating unit is communicated with an input of the compressor, and an output of the refrigerating unit circuit is communicated with an input of the controller.
Preferably, the passenger compartment air conditioning refrigerant circulating system and the refrigerated container refrigerant circulating system share common equipment, wherein the common equipment comprises a condensation drying component and a pressure switch, the output of the compressor is communicated with the input of the condensation drying component, and the output of the condensation drying component is communicated with the input of the pressure switch;
the passenger compartment air conditioner refrigerant circulating system comprises a passenger compartment evaporator, and the refrigerated cargo box refrigerant circulating system comprises a cargo compartment refrigerating unit; one path of output of the pressure switch is communicated with the input of the controller, the other path of output of the pressure switch is communicated with the input of the passenger compartment evaporator, the other path of output of the passenger compartment evaporator is communicated with the input of the controller, the other path of output of the passenger compartment evaporator is communicated with the input of the compressor, the other path of output of the cargo compartment refrigerating unit is communicated with the input of the controller, and the other path of output of the cargo compartment refrigerating unit is communicated with the input of the compressor;
the electronic expansion valve is arranged on a pipeline between the output of the pressure switch and the input of the passenger cabin evaporator, one path of the input of the electronic expansion valve is communicated with the output of the pressure switch, the other path of the input of the electronic expansion valve is communicated with the output of the controller, and the output of the electronic expansion valve is communicated with the input of the passenger cabin evaporator;
the flow regulator is arranged on a pipeline between the output of the pressure switch and the input of the cargo compartment refrigerating unit, one path of the input of the flow regulator is communicated with the output of the pressure switch, the other path of the input of the flow regulator is communicated with the output of the controller, the output of the flow regulator is communicated with the input of the cargo compartment refrigerating unit, and the flow regulator is an electronic expansion valve.
Preferably, the condensation drying assembly comprises a condenser and a dryer, and the condenser is electrically connected with the dryer.
The invention also discloses a circulating refrigerant control method for the refrigerated transport vehicle, which comprises the following steps:
s1, operating the circulating refrigerant control device for the refrigerated transport vehicle, receiving the current temperature input of the cargo compartment by the controller, judging whether the target temperature input of the cargo compartment is received or not, selecting to execute subsequent operation by the controller according to the judgment result,
when the judgment result shows that the cargo compartment target temperature is not input, the flow proceeds to step S2,
when the judgment result shows that the target temperature of the cargo compartment is input, the step is carried out to S3;
s2, the controller judges the open and close state of the air-conditioning refrigerant circulating system of the passenger compartment and selects to execute the following operation according to the open and close state,
when the opening and closing state is that the air-conditioning refrigerant circulation system of the passenger compartment is not opened, the process proceeds to step S21,
when the opening and closing state is that the passenger compartment air conditioning refrigerant circulating system is opened, the step S22 is carried out;
s3, the controller judges the device operation instruction and selects to execute the following operation according to the device operation instruction,
when the device operation command is to turn on only the passenger compartment air conditioning refrigerant circulation system, the process proceeds to step S31,
when the operation command of the device is to turn on only the cargo space air conditioning refrigerant circulation system, the process proceeds to step S32,
when the device operation instruction is that the passenger compartment air-conditioning refrigerant circulating system and the cargo compartment air-conditioning refrigerant circulating system are simultaneously started, the step S33 is carried out;
when the air-conditioning refrigerant circulating system of the passenger compartment and the refrigerant circulating system of the refrigerated container are both opened, the controller analyzes the current cooling rate, and if the current cooling rate is lower than the preset cooling rate in the controller, the controller gradually reduces the opening of the electronic expansion valve on the basis of the requirement of the working condition of the air-conditioning refrigerant circulating system of the passenger compartment on the opening of the electronic expansion valve.
Preferably, the step of S21 specifically includes,
the controller controls the electronic expansion valve to keep a complete cut-off state, drives the compressor to operate when a compressor driving signal in a refrigerant circulating system of the refrigerated container is a compressor operation requirement, then judges the connection relation of the flow regulator and selects to execute subsequent operation according to the connection relation,
when the connection relationship is that the flow regulator is communicated with the controller and is not communicated with the refrigerating unit circuit, the step S211 is entered,
when the connection relationship is that the flow regulator is communicated with the refrigerating unit circuit and not communicated with the controller, the step S212 is entered;
the step S211 specifically includes the step of,
the controller controls the flow regulator according to a compressor driving signal in a refrigerant circulating system of the refrigerated container, controls the flow regulator to be switched on when the compressor driving signal is the operation requirement of the compressor, and controls the flow regulator to be switched off when the compressor driving signal is the stop of the compressor or after the preset time is prolonged;
the step S212 specifically includes the step of,
the controller controls the flow regulator according to a compressor driving signal in a refrigerant circulating system of the refrigerated container, and controls the flow regulator to be conducted when the compressor driving signal exists;
the step of S22 specifically includes that,
the controller receives the driving signal of the compressor in the refrigerant circulating system of the refrigerated container and selects to execute the subsequent operation according to the receiving result,
when the controller does not receive the compressor driving signal, the step S221 is entered,
when the controller receives a compressor driving signal and the compressor driving signal is a compressor operation demand, entering step S222;
the step S221 specifically includes the step of,
the controller adjusts the opening of the electronic expansion valve according to the working condition of the air conditioner refrigerant circulating system of the passenger compartment and controls the operation of the compressor;
the step S222 specifically includes the step of,
the controller analyzes the current cooling rate according to the received current temperature of the cargo compartment,
when the current cooling rate is lower than a preset cooling rate in the controller and the current system pressure is not higher than the alarm pressure in the controller, the controller gradually reduces the opening of the electronic expansion valve on the basis of the requirement of the working condition of the air-conditioning refrigerant circulating system of the passenger compartment on the opening of the electronic expansion valve;
when the current system pressure is higher than the alarm pressure in the controller, the controller increases the opening of the electronic expansion valve on the basis of the requirement of the working condition of the air-conditioning refrigerant circulating system of the passenger compartment on the opening of the electronic expansion valve until the compressor driving signal is converted into the compressor to stop, and the controller updates the temperature at the moment to be the predicted lower temperature limit t0Then gradually recovering the opening degree of the electronic expansion valve according to the working condition of the air-conditioning refrigerant circulating system of the passenger compartment until the driving signal of the compressor is converted into the operation requirement of the compressor again, and updating the temperature at the moment to be the predicted upper limit t of the low temperature by the controller1；
The step S222 further includes the step of,
when the cargo compartment temperature is changed from the updated predicted low temperature upper limit t1To predict lower temperature limit t0When the temperature of the passenger compartment air conditioner is lowered, the controller analyzes the current cooling rate, and when the current cooling rate is lower than the preset cooling rate in the controller and the current system pressure is not higher than the alarm pressure in the controller, the controller gradually reduces the opening of the electronic expansion valve on the basis of the requirement of the working condition of the refrigerant circulating system of the passenger compartment on the opening of the electronic expansion valve;
when the current system pressure is higher than the alarm pressure in the controller, the controller increases the opening degree of the electronic expansion valve on the basis of the requirement of the working condition of the air-conditioning refrigerant circulating system of the passenger compartment on the opening degree of the electronic expansion valve until the current system pressure is lower than the alarm pressure in the controller, and then gradually reduces the opening degree of the electronic expansion valve until the driving signal of the compressor is converted into the driving signal of the compressor to stop.
Preferably, the step of S31 specifically includes,
controlling a flow regulator to keep a cut-off state, and regulating the opening of an electronic expansion valve and controlling the operation of a compressor by the controller according to the working condition of a refrigerant circulating system of the air conditioner of the passenger compartment;
the step of S32 specifically includes that,
the controller controls the electronic expansion valve to keep a cut-off state, and controls the compressor to operate according to the working condition of the cargo space air conditioner refrigerant circulating system;
the step of S33 specifically includes that,
the controller compares the current temperature of the cargo compartment with the upper limit and the lower limit of the target temperature of the cargo compartment according to the received current temperature of the cargo compartment, determines that the current temperature of the cargo compartment is a cooling stage if the current temperature of the cargo compartment is higher than the upper limit of the target temperature of the cargo compartment, determines that the current temperature of the cargo compartment is a heat preservation stage if the current temperature of the cargo compartment is between the upper limit and the lower limit of the target temperature of the cargo compartment, and sets different cooling rates for the cooling stage and the heat preservation stage respectively; the controller analyzes the current cooling rate, and when the current cooling rate is lower than the preset cooling rate and the current system pressure is not higher than the alarm pressure in the controller, the controller gradually reduces the opening of the electronic expansion valve on the basis of the requirement of the working condition of the refrigerant circulating system of the passenger compartment on the opening of the electronic expansion valve; when the current system pressure is higher than the alarm pressure in the controller, the controller increases the opening of the electronic expansion valve on the basis of the requirement of the working condition of the air-conditioning refrigerant circulating system of the passenger compartment on the opening of the electronic expansion valve until the current system pressure is lower than the alarm pressure in the controller, and then gradually reduces the opening of the electronic expansion valve until the current temperature of the cargo compartment reaches the range between the upper limit and the lower limit of the target temperature of the cargo compartment, and at the moment, the controller gradually adjusts and recovers the opening of the electronic expansion valve according to the working condition of the air-conditioning refrigerant circulating system of the passenger compartment under the condition that the current temperature of the cargo compartment is not changed.
Preferably, when the cargo compartment air-conditioning refrigerant circulating system is in a heat preservation and cooling stage and the passenger compartment air-conditioning refrigerant circulating system needs to be shut down when reaching the target temperature, the compressor is stopped, the current temperature of the cargo compartment is ensured to be within the upper limit range and the lower limit range of the target temperature of the cargo compartment, and the compressor is started when the passenger compartment air-conditioning refrigerant circulating system sends out the operation requirement of the compressor again.
Compared with the prior art, the invention has the advantages that:
the invention effectively realizes the integration of the passenger compartment air conditioning refrigeration cycle system and the refrigerated container refrigeration cycle system, fully ensures the respective refrigeration effects of the passenger compartment air conditioning refrigeration cycle system and the refrigerated container refrigeration cycle system, and overcomes the problem of fluctuation of the refrigeration effect in the prior art. Meanwhile, the invention solves the problem of dynamic distribution of refrigerant flow, so that two sets of refrigeration cycle systems can share one set of compressor, thereby not only reducing the number of parts in the vehicle refrigeration system and lowering the equipment cost, but also being more in line with the development trend of energy conservation and environmental protection advocated in the transportation industry at present. In addition, the invention also provides reference for other related problems in the same field, can be expanded and extended on the basis of the reference, is applied to other technical schemes of multi-refrigeration system integration in the same field, and has very wide application prospect.
The following detailed description of the embodiments of the present invention is provided in connection with the accompanying drawings for the purpose of facilitating understanding and understanding of the technical solutions of the present invention.
Drawings
FIG. 1 is a schematic structural diagram of a first embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a second embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a third embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a fourth embodiment of the present invention;
wherein: 1. a controller; 2. an electronic expansion valve; 3. a flow regulator; 4. a compressor; 5. a condensing and drying assembly; 6. a pressure switch; 7. a passenger compartment evaporator; 8. a cargo compartment refrigeration unit; 9. a refrigeration unit circuit; 10. a cargo compartment temperature sensor.
Detailed Description
As shown in the figure, the invention discloses a circulating refrigerant control device for a refrigerated transport vehicle, which comprises a double refrigerant circulating system, wherein the double refrigerant circulating system comprises a passenger compartment air conditioner refrigerant circulating system and a refrigerated container refrigerant circulating system. The circulating refrigerant control device for the refrigerated transport vehicle further comprises a controller 1 for realizing control and adjustment of the double refrigerant circulating systems, and a compressor 4 shared by the passenger compartment air-conditioning refrigerant circulating system and the refrigerated container refrigerant circulating system, wherein the controller 1 is in control connection with the passenger compartment air-conditioning refrigerant circulating system and the refrigerated container refrigerant circulating system and is used for realizing control and adjustment of the double refrigerant circulating systems on the refrigerated transport vehicle; one path of the output of the compressor 4 is communicated with the input of the passenger compartment air conditioner refrigerant circulating system, and the other path of the output of the compressor is communicated with the input of the refrigerated container refrigerant circulating system; an electronic expansion valve 2 for controlling the flow of the refrigerant is arranged on a pipeline between the output of the compressor 4 and the input of the refrigerant circulating system of the air conditioner of the passenger compartment; a flow regulator 3 for controlling the flow of the refrigerant is arranged on a pipeline between the output of the compressor and the input of the refrigerant circulating system of the refrigerated container.
As shown in fig. 1 to 3, the passenger compartment air conditioning refrigerant circulation system includes a condensation drying component 5, a pressure switch 6 and a passenger compartment evaporator 7; the input of the condensation drying component 5 is communicated with the output of the compressor 4, the output of the condensation drying component 5 is communicated with the input of the pressure switch, one path of the output of the pressure switch 6 is communicated with the input of the controller 1, the other path of the output of the pressure switch is communicated with the input of the passenger compartment evaporator 7, one path of the output of the passenger compartment evaporator 7 is communicated with the input of the controller 1, and the other path of the output of the passenger compartment evaporator 7 is communicated with the input of the compressor 4; the electronic expansion valve 2 is arranged on a pipeline between the output of the pressure switch 6 and the input of the passenger compartment evaporator 7, one path of the input of the electronic expansion valve 2 is communicated with the output of the pressure switch, the other path of the input of the electronic expansion valve 2 is communicated with the output of the controller 1, and the output of the electronic expansion valve 2 is communicated with the input of the passenger compartment evaporator 7.
The refrigeration container refrigerant circulating system comprises a cargo compartment refrigeration unit 8 and a refrigeration unit circuit 9, wherein the refrigeration unit circuit 9 is electrically connected with the cargo compartment refrigeration unit 8; one path of the output of the compressor 4 is communicated with the input of the controller 1, one path is communicated with the input of the condensation drying component 5, and the other path is communicated with the input of the cargo compartment refrigerating unit 8; the flow regulator 3 is arranged on a line between the output of the compressor 4 and the input of the cargo compartment cold storage unit 8.
One path of input of the flow regulator 3 is communicated with output of the compressor 4, the other path of input of the flow regulator 3 is communicated with output of the controller 1, output of the flow regulator 3 is communicated with input of the cargo compartment refrigerating unit 8, output of the cargo compartment refrigerating unit 8 is communicated with input of the compressor 4, and output of the refrigerating unit circuit 9 is communicated with input of the controller 1.
As shown in fig. 3, in the third embodiment of the present invention, the refrigerated cargo box coolant circulating system further includes a cargo compartment temperature sensor 10, an output of which is communicated with an input of the controller 1.
As shown in fig. 2, in a second embodiment of the present invention, the input of the flow regulator 3 is in communication with the output of the compressor 4, the output of the flow regulator 3 is in communication with the input of the cargo compartment refrigeration unit 8 in one way and the input of the refrigeration unit circuit 9 in another way, the output of the cargo compartment refrigeration unit 8 is in communication with the input of the compressor 4, and the output of the refrigeration unit circuit 9 is in communication with the input of the controller 1.
It should be noted that there are other structural embodiments of the apparatus of the present invention, specifically, as shown in fig. 4, the apparatus for controlling a circulating refrigerant for a refrigerated transport vehicle further includes a common device shared by both the passenger compartment air-conditioning refrigerant circulating system and the refrigerated container refrigerant circulating system, the common device includes a condensation drying component 5 and a pressure switch 6, an output of the compressor 4 is communicated with an input of the condensation drying component 5, and an output of the condensation drying component 5 is communicated with an input of the pressure switch 6.
The passenger compartment air-conditioning refrigerant circulating system comprises a passenger compartment evaporator 7, and the refrigerated cargo box refrigerant circulating system comprises a cargo compartment refrigerating unit 8; the output of the pressure switch 6 is communicated with the input of the controller 1, the input of the passenger compartment evaporator 7 and the input of the cargo compartment refrigerating unit 8, the output of the passenger compartment evaporator 7 is communicated with the input of the controller 1 and the input of the compressor 4, and the output of the cargo compartment refrigerating unit 8 is communicated with the input of the controller 1 and the input of the compressor 4.
The electronic expansion valve 2 is arranged on a pipeline between the output of the pressure switch 6 and the input of the passenger compartment evaporator 7, one path of the input of the electronic expansion valve 2 is communicated with the output of the pressure switch 6, the other path of the input of the electronic expansion valve 2 is communicated with the output of the controller 1, and the output of the electronic expansion valve 2 is communicated with the input of the passenger compartment evaporator 7.
The flow regulator 3 is arranged on a pipeline between the output of the pressure switch 6 and the input of the cargo compartment refrigerating unit 8, one path of the input of the flow regulator 3 is communicated with the output of the pressure switch 6, the other path of the input of the flow regulator 3 is communicated with the output of the controller 1, the output of the flow regulator 3 is communicated with the input of the cargo compartment refrigerating unit 8, and the flow regulator 3 is an electronic expansion valve.
It should be added that the condensation drying assembly 5 in the above embodiment includes a condenser and a dryer, and the condenser is electrically connected to the dryer.
The invention also discloses a circulating refrigerant control method for the refrigerated transport vehicle, which comprises the following steps:
s1, operating the circulating refrigerant control device for the refrigerated transport vehicle, receiving the current temperature input of the cargo compartment by the controller 1, judging whether the target temperature input of the cargo compartment is received or not, selecting to execute subsequent operation by the controller 1 according to the judgment result,
when the judgment result shows that the cargo compartment target temperature is not input, the flow proceeds to step S2,
when the judgment result shows that the target temperature of the cargo compartment is input, the step is carried out to S3;
s2, the controller 1 judges the open and close state of the air-conditioning refrigerant circulating system of the passenger compartment and selects to execute the following operation according to the open and close state,
when the opening and closing state is that the air-conditioning refrigerant circulation system of the passenger compartment is not opened, the process proceeds to step S21,
when the opening and closing state is that the passenger compartment air conditioning refrigerant circulating system is opened, the step S22 is carried out;
s3, the controller 1 determines the device operation command and selects to execute the subsequent operation according to the device operation command,
when the device operation command is to turn on only the passenger compartment air conditioning refrigerant circulation system, the process proceeds to step S31,
when the operation command of the device is to turn on only the cargo space air conditioning refrigerant circulation system, the process proceeds to step S32,
when the device operation command is to simultaneously start the passenger compartment air-conditioning refrigerant circulation system and the cargo compartment air-conditioning refrigerant circulation system, the process proceeds to step S33.
In the method, when both the passenger compartment air-conditioning refrigerant circulating system and the refrigerated container refrigerant circulating system are opened, the controller 1 analyzes the current cooling rate, and if the current cooling rate is lower than the preset cooling rate in the controller 1, the controller 1 gradually reduces the opening degree of the electronic expansion valve 2 on the basis of the requirement of the working condition of the passenger compartment air-conditioning refrigerant circulating system on the opening degree of the electronic expansion valve 2.
The steps of the method are specifically described below, and the step S21 specifically includes:
the controller 1 controls the electronic expansion valve 2 to keep a complete cut-off state, and drives the compressor 4 to operate when a compressor driving signal in a refrigerant circulating system of the refrigerated container is a compressor operation demand, then the controller 1 judges the connection relation of the flow regulator 3 and selects to execute subsequent operation according to the connection relation,
when the connection relationship is that the flow regulator 3 is communicated with the controller 1 and is not communicated with the refrigerating unit circuit 9, the step S211 is entered,
when the connection relationship is that the flow regulator 3 is communicated with the refrigerating unit circuit 9 and is not communicated with the controller 1, the step S212 is entered;
the step S211 specifically includes:
the controller 1 controls the flow regulator 3 according to a compressor driving signal in a refrigerant circulating system of the refrigerated container, controls the flow regulator 3 to be switched on when the compressor driving signal is the operation requirement of the compressor, and controls the flow regulator 3 to be switched off after the flow regulator 3 is synchronized or the preset time is prolonged when the compressor driving signal is the stop of the compressor;
the step S212 specifically includes:
the controller 1 controls the flow regulator 3 according to a compressor driving signal in a refrigerant circulating system of the refrigerated container, and controls the flow regulator 3 to be conducted when the compressor driving signal exists.
The step S22 specifically includes:
the controller 1 receives the driving signal of the compressor in the refrigerant circulating system of the refrigerated container and selects to execute the subsequent operation according to the receiving result,
when the controller 1 does not receive the compressor driving signal, it proceeds to step S221,
when the controller 1 receives a compressor driving signal and the compressor driving signal is a compressor operation demand, the step S222 is performed;
the step S221 specifically includes:
the controller 1 adjusts the opening of the electronic expansion valve 2 according to the working condition of the air-conditioning refrigerant circulating system of the passenger compartment and controls the operation of the compressor 4;
the step S222 specifically includes:
the controller 1 analyzes the current cooling rate according to the received current temperature of the cargo compartment,
when the current cooling rate is lower than a preset cooling rate in the controller 1 and the current system pressure is not higher than the alarm pressure in the controller 1, the controller 1 gradually reduces the opening degree of the electronic expansion valve 2 on the basis of the requirement of the working condition of the refrigerant circulating system of the passenger compartment air conditioner on the opening degree of the electronic expansion valve 2;
when the current system pressure is higher than the alarm pressure in the controller 1, the controller 1 increases the opening degree of the electronic expansion valve 2 on the basis of the requirement of the working condition of the air-conditioning refrigerant circulating system of the passenger compartment on the opening degree of the electronic expansion valve 2 until the compressor driving signal is converted into the compressor to stop, and the controller 1 updates the temperature at the moment to be the predicted lower temperature limit t0Then according to the air-conditioning refrigerant circulation of the passenger compartmentGradually recovering the opening degree of the electronic expansion valve 2 under the working condition of the loop system until the compressor driving signal is converted into the operation requirement of the compressor again, and updating the temperature at the moment to be the predicted lower temperature upper limit t by the controller 11。
In addition, when the cargo compartment temperature is changed from the updated predicted low temperature upper limit t1To predict lower temperature limit t0When the temperature of the passenger compartment drops, the controller 1 analyzes the current temperature reduction rate, and when the current temperature reduction rate is lower than the preset temperature reduction rate in the controller 1 and the current system pressure is not higher than the alarm pressure in the controller 1, the controller 1 gradually reduces the opening degree of the electronic expansion valve 2 on the basis of the requirement of the working condition of the refrigerant circulating system of the air conditioner of the passenger compartment on the opening degree of the electronic expansion valve 2;
when the current system pressure is higher than the alarm pressure in the controller 1, the controller 1 increases the opening degree of the electronic expansion valve 2 on the basis of the requirement of the working condition of the air-conditioning refrigerant circulation system of the passenger compartment on the opening degree of the electronic expansion valve 2 until the current system pressure is lower than the alarm pressure in the controller 1, and then gradually decreases the opening degree of the electronic expansion valve 2 until the driving signal of the compressor is converted into the driving signal of the compressor to stop.
The step S31 specifically includes:
the flow regulator 3 is controlled to keep a cut-off state, and the controller 1 regulates the opening degree of the electronic expansion valve 2 and controls the operation of the compressor 4 according to the working condition of the air-conditioning refrigerant circulating system of the passenger compartment.
The step S32 specifically includes:
the controller 1 controls the electronic expansion valve 2 to keep a cut-off state, and the controller 1 controls the compressor 4 to operate according to the working condition of the cargo compartment air-conditioning refrigerant circulating system.
The step S33 specifically includes:
the controller 1 compares the current temperature of the cargo compartment with the upper limit and the lower limit of the target temperature of the cargo compartment according to the received current temperature of the cargo compartment, determines that the current temperature of the cargo compartment is a cooling stage if the current temperature of the cargo compartment is higher than the upper limit of the target temperature of the cargo compartment, determines that the current temperature of the cargo compartment is a heat preservation stage if the current temperature of the cargo compartment is between the upper limit and the lower limit of the target temperature of the cargo compartment, and sets different cooling rates for the cooling stage and the heat preservation stage to the controller 1 respectively; the controller 1 analyzes a current cooling rate, and when the current cooling rate is lower than a preset cooling rate and the current system pressure is not higher than the alarm pressure in the controller 1, the controller 1 gradually reduces the opening degree of the electronic expansion valve 2 on the basis of the requirement of the working condition of the refrigerant circulating system of the air conditioner of the passenger compartment on the opening degree of the electronic expansion valve 2; when the current system pressure is higher than the alarm pressure in the controller 1, the controller 1 increases the opening degree of the electronic expansion valve 2 on the basis of the requirement of the working condition of the air-conditioning refrigerant circulation system of the passenger compartment on the opening degree of the electronic expansion valve 2 until the current system pressure is lower than the alarm pressure in the controller 1, and then gradually decreases the opening degree of the electronic expansion valve 2 until the current temperature of the cargo compartment reaches the range between the upper limit and the lower limit of the target temperature of the cargo compartment, and at this time, the controller 1 gradually adjusts and restores the opening degree of the electronic expansion valve 2 according to the working condition of the air-conditioning refrigerant circulation system of the passenger compartment under the condition that the current temperature of the cargo compartment is not changed.
Under the general condition, the temperature of the cargo compartment changes slowly, and the temperature of the passenger compartment changes rapidly, so that when the cargo compartment air-conditioning refrigerant circulating system is in a heat preservation and cooling stage and the passenger compartment air-conditioning refrigerant circulating system needs to be stopped when reaching a target temperature, the compressor 4 is stopped, the current temperature of the cargo compartment is ensured to be within the upper limit range and the lower limit range of the target temperature of the cargo compartment, and the compressor 4 is started when the passenger compartment air-conditioning refrigerant circulating system sends out the operation requirement of the compressor again, so that the starting and stopping times of the compressor 4 are reduced.
The invention effectively realizes the integration of the passenger compartment air conditioning refrigeration cycle system and the refrigerated container refrigeration cycle system, fully ensures the respective refrigeration effects of the passenger compartment air conditioning refrigeration cycle system and the refrigerated container refrigeration cycle system, and overcomes the problem of fluctuation of the refrigeration effect in the prior art.
Meanwhile, the invention solves the problem of dynamic distribution of refrigerant flow, so that two sets of refrigeration cycle systems can share one set of compressor, thereby not only reducing the number of parts in the vehicle refrigeration system and lowering the equipment cost, but also being more in line with the development trend of energy conservation and environmental protection advocated in the transportation industry at present.
In addition, the invention also provides reference for other related problems in the same field, can be expanded and extended on the basis of the reference, is applied to other technical schemes of multi-refrigeration system integration in the same field, and has very wide application prospect.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (2)

1. The utility model provides a circulating refrigerant controlling means for refrigerated transport vehicle, includes two refrigerant circulation systems, two refrigerant circulation systems include passenger compartment air conditioner refrigerant circulation system and refrigerated container refrigerant circulation system, its characterized in that: the passenger compartment air-conditioning refrigerant circulating system and the refrigerated container refrigerant circulating system are connected in a control mode through the controller (1) and used for realizing control and adjustment of the double refrigerant circulating systems on the refrigerated transport vehicle; one path of the output of the compressor (4) is communicated with the input of the passenger compartment air conditioner refrigerant circulating system, and the other path of the output of the compressor is communicated with the input of the refrigerated container refrigerant circulating system; an electronic expansion valve (2) for controlling the flow of the refrigerant is arranged on a pipeline between the output of the compressor (4) and the input of the refrigerant circulating system of the air conditioner of the passenger compartment; a flow regulator (3) for controlling the flow of the refrigerant is arranged on a pipeline between the output of the compressor and the input of the refrigerant circulating system of the refrigerated container;
the passenger compartment air conditioning refrigerant circulating system comprises a condensation drying component (5), a pressure switch (6) and a passenger compartment evaporator (7); the input of the condensation drying component (5) is communicated with the output of the compressor (4), the output of the condensation drying component (5) is communicated with the input of the pressure switch, one path of the output of the pressure switch (6) is communicated with the input of the controller (1), the other path of the output of the pressure switch is communicated with the input of the passenger compartment evaporator (7), one path of the output of the passenger compartment evaporator (7) is communicated with the input of the controller (1), and the other path of the output of the passenger compartment evaporator (7) is communicated with the input of the compressor (4); the electronic expansion valve (2) is arranged on a pipeline between the output of the pressure switch (6) and the input of the passenger compartment evaporator (7), one input path of the electronic expansion valve (2) is communicated with the output of the pressure switch, the other input path of the electronic expansion valve is communicated with the output of the controller (1), and the output of the electronic expansion valve (2) is communicated with the input of the passenger compartment evaporator (7);
the refrigeration container refrigerant circulating system comprises a cargo compartment refrigeration unit (8) and a refrigeration unit circuit (9), wherein the refrigeration unit circuit (9) is electrically connected with the cargo compartment refrigeration unit (8); one path of the output of the compressor (4) is communicated with the input of the controller (1), one path is communicated with the input of the condensation drying component (5), and the other path is communicated with the input of the cargo compartment refrigerating unit (8); the flow regulator (3) is arranged on a pipeline between the output of the compressor (4) and the input of the cargo compartment refrigeration unit (8);
one input path of the flow regulator (3) is communicated with the output of the compressor (4), the other input path of the flow regulator is communicated with the output of the controller (1), the output of the flow regulator (3) is communicated with the input of the cargo compartment refrigerating unit (8), the output of the cargo compartment refrigerating unit (8) is communicated with the input of the compressor (4), and the output of the refrigerating unit circuit (9) is communicated with the input of the controller (1);
the refrigeration container refrigerant circulating system also comprises a cargo compartment temperature sensor (10), and the output of the cargo compartment temperature sensor is communicated with the input of the controller (1);
the input of the flow regulator (3) is communicated with the output of the compressor (4), one path of the output of the flow regulator (3) is communicated with the input of the cargo compartment refrigerating unit (8), the other path of the output of the flow regulator is communicated with the input of the refrigerating unit circuit (9), the output of the cargo compartment refrigerating unit (8) is communicated with the input of the compressor (4), and the output of the refrigerating unit circuit (9) is communicated with the input of the controller (1);
the passenger compartment air conditioner refrigerant circulating system and the refrigerated container refrigerant circulating system are shared, the common equipment comprises a condensation drying component (5) and a pressure switch (6), the output of the compressor (4) is communicated with the input of the condensation drying component (5), and the output of the condensation drying component (5) is communicated with the input of the pressure switch (6);
the passenger compartment air conditioning refrigerant circulating system comprises a passenger compartment evaporator (7), and the refrigerated cargo box refrigerant circulating system comprises a cargo compartment refrigerating unit (8); one path of output of the pressure switch (6) is communicated with the input of the controller (1), one path of output of the pressure switch is communicated with the input of the passenger compartment evaporator (7), the other path of output of the passenger compartment evaporator (7) is communicated with the input of the controller (1), the other path of output of the passenger compartment evaporator is communicated with the input of the compressor (4), one path of output of the cargo compartment refrigerating unit (8) is communicated with the input of the controller (1), and the other path of output of the cargo compartment refrigerating unit is communicated with the input of the compressor (4);
the electronic expansion valve (2) is arranged on a pipeline between the output of the pressure switch (6) and the input of the passenger compartment evaporator (7), one input path of the electronic expansion valve (2) is communicated with the output of the pressure switch (6), the other input path of the electronic expansion valve is communicated with the output of the controller (1), and the output of the electronic expansion valve (2) is communicated with the input of the passenger compartment evaporator (7);
the flow regulator (3) is arranged on a pipeline between the output of the pressure switch (6) and the input of the cargo compartment refrigerating unit (8), one path of the input of the flow regulator (3) is communicated with the output of the pressure switch (6), the other path of the input of the flow regulator is communicated with the output of the controller (1), the output of the flow regulator (3) is communicated with the input of the cargo compartment refrigerating unit (8), and the flow regulator (3) is an electronic expansion valve;
the condensation drying component (5) comprises a condenser and a dryer, and the condenser is electrically connected with the dryer.
2. The circulating refrigerant control method for the refrigerated transport vehicle is based on the circulating refrigerant control device for the refrigerated transport vehicle as claimed in claim 1, and is characterized by comprising the following steps:
s1, operating the circulating refrigerant control device for the refrigerated transport vehicle, receiving the current temperature input of the cargo compartment by the controller (1) and judging whether the target temperature input of the cargo compartment is received or not, selecting to execute subsequent operation by the controller (1) according to the judgment result,
when the judgment result shows that the cargo compartment target temperature is not input, the flow proceeds to step S2,
when the judgment result shows that the target temperature of the cargo compartment is input, the step is carried out to S3;
s2, the controller (1) judges the opening and closing state of the air conditioning refrigerant circulating system of the passenger compartment and selects to execute the subsequent operation according to the opening and closing state,
when the opening and closing state is that the air-conditioning refrigerant circulation system of the passenger compartment is not opened, the process proceeds to step S21,
when the opening and closing state is that the passenger compartment air conditioning refrigerant circulating system is opened, the step S22 is carried out;
s3, the controller (1) judges the device operation instruction and selects to execute the subsequent operation according to the device operation instruction,
when the device operation command is to turn on only the passenger compartment air conditioning refrigerant circulation system, the process proceeds to step S31,
when the operation command of the device is to turn on only the cargo space air conditioning refrigerant circulation system, the process proceeds to step S32,
when the device operation instruction is that the passenger compartment air-conditioning refrigerant circulating system and the cargo compartment air-conditioning refrigerant circulating system are simultaneously started, the step S33 is carried out;
when both the passenger compartment air conditioner refrigerant circulating system and the refrigerated container refrigerant circulating system are opened, the controller (1) analyzes the current cooling rate, and if the current cooling rate is lower than the preset cooling rate in the controller (1), the controller (1) gradually reduces the opening degree of the electronic expansion valve (2) on the basis of the requirement of the working condition of the passenger compartment air conditioner refrigerant circulating system on the opening degree of the electronic expansion valve (2);
the step of S21 specifically includes that,
the controller (1) controls the electronic expansion valve (2) to keep a complete cut-off state, and drives the compressor (4) to operate when a compressor driving signal in a refrigerant circulating system of the refrigerated container is a compressor operation demand, then the controller (1) judges the connection relation of the flow regulator (3) and selects to execute subsequent operation according to the connection relation,
when the connection relationship is that the flow regulator (3) is communicated with the controller (1) and is not communicated with the refrigerating unit circuit (9), the step S211 is carried out,
when the connection relationship is that the flow regulator (3) is communicated with the refrigerating unit circuit (9) and is not communicated with the controller (1), the step S212 is carried out;
the step S211 specifically includes the step of,
the controller (1) controls the flow regulator (3) according to a compressor driving signal in a refrigerant circulating system of the refrigerated container, controls the flow regulator (3) to be switched on when the compressor driving signal is the operation requirement of the compressor, and controls the flow regulator (3) to be switched off after synchronizing or prolonging preset time when the compressor driving signal is the stop of the compressor;
the step S212 specifically includes the step of,
the controller (1) controls the flow regulator (3) according to a compressor driving signal in a refrigeration container refrigerant circulating system, and controls the flow regulator (3) to be conducted when the compressor driving signal exists;
the step of S22 specifically includes that,
the controller (1) receives a compressor driving signal in a refrigerant circulating system of the refrigerated container and selects to execute subsequent operation according to the receiving result,
when the controller (1) does not receive the compressor driving signal, the step S221 is entered,
when the controller (1) receives a compressor driving signal and the compressor driving signal is a compressor operation demand, entering step S222;
the step S221 specifically includes the step of,
the controller (1) adjusts the opening of the electronic expansion valve (2) according to the working condition of the air-conditioning refrigerant circulating system of the passenger compartment and controls the operation of the compressor (4);
the step S222 specifically includes the step of,
the controller (1) analyzes the current cooling rate according to the received current temperature of the cargo compartment,
when the current cooling rate is lower than a preset cooling rate in the controller (1) and the current system pressure is not higher than the alarm pressure in the controller (1), the controller (1) gradually reduces the opening degree of the electronic expansion valve (2) on the basis of the requirement of the working condition of the air-conditioning refrigerant circulating system of the passenger compartment on the opening degree of the electronic expansion valve (2);
when the current system pressure is higher than the alarm pressure in the controller (1), the controller (1) increases the opening degree of the electronic expansion valve (2) on the basis of the requirement of the working condition of the air-conditioning refrigerant circulating system of the passenger compartment on the opening degree of the electronic expansion valve (2) until the compressor driving signal is converted into the compressor to stop, and the controller (1) updates the temperature at the moment to be the predicted lower temperature lower limit t0Then gradually recovering the opening degree of the electronic expansion valve (2) according to the working condition of the air-conditioning refrigerant circulating system of the passenger compartment until the driving signal of the compressor is converted into the operation requirement of the compressor again, and updating the temperature at the moment to be the predicted upper limit t of the low temperature by the controller (1)1；
The step S222 further includes the step of,
when the cargo compartment temperature is changed from the updated predicted low temperature upper limit t1To predict lower temperature limit t0When descending, the controller (1)) Analyzing a current cooling rate, and when the current cooling rate is lower than a preset cooling rate in the controller (1) and the current system pressure is not higher than the alarm pressure in the controller (1), the controller (1) gradually reduces the opening degree of the electronic expansion valve (2) on the basis of the requirement of the working condition of a refrigerant circulating system of an air conditioner of a passenger compartment on the opening degree of the electronic expansion valve (2);
when the current system pressure is higher than the alarm pressure in the controller (1), the controller (1) increases the opening degree of the electronic expansion valve (2) on the basis of the requirement of the working condition of a refrigerant circulating system of the passenger compartment on the opening degree of the electronic expansion valve (2) until the current system pressure is lower than the alarm pressure in the controller (1), and then gradually reduces the opening degree of the electronic expansion valve (2) until the driving signal of the compressor is converted into the compressor to stop;
the step of S31 specifically includes that,
the flow regulator (3) is controlled to keep a cut-off state, and the controller (1) regulates the opening of the electronic expansion valve (2) and controls the compressor (4) to operate according to the working condition of the air-conditioning refrigerant circulating system of the passenger compartment;
the step of S32 specifically includes that,
the controller (1) controls the electronic expansion valve (2) to keep a cut-off state; the controller (1) controls the compressor (4) to operate according to the working condition of the cargo compartment air conditioner refrigerant circulating system;
the step of S33 specifically includes that,
the controller (1) compares the current temperature of the cargo compartment with the upper limit and the lower limit of a target temperature of the cargo compartment according to the received current temperature of the cargo compartment, determines that the current temperature of the cargo compartment is a cooling stage if the current temperature of the cargo compartment is higher than the upper limit of the target temperature of the cargo compartment, determines that the current temperature of the cargo compartment is a heat preservation stage if the current temperature of the cargo compartment is between the upper limit and the lower limit of the target temperature of the cargo compartment, and sets different cooling rates for the cooling stage and the heat preservation stage to the controller (1); the controller (1) analyzes the current cooling rate, and when the current cooling rate is lower than the preset cooling rate and the current system pressure is not higher than the alarm pressure in the controller (1), the controller (1) gradually reduces the opening degree of the electronic expansion valve (2) on the basis of the requirement of the working condition of the refrigerant circulating system of the air conditioner of the passenger compartment on the opening degree of the electronic expansion valve (2); when the current system pressure is higher than the alarm pressure in the controller (1), the controller (1) increases the opening degree of the electronic expansion valve (2) on the basis of the requirement of the working condition of a passenger compartment air-conditioning refrigerant circulating system on the opening degree of the electronic expansion valve (2) until the current system pressure is lower than the alarm pressure in the controller (1), and then gradually reduces the opening degree of the electronic expansion valve (2) until the current temperature of the cargo compartment reaches the range between the upper limit and the lower limit of the target temperature of the cargo compartment, and at the moment, the controller (1) gradually adjusts and restores the opening degree of the electronic expansion valve (2) according to the working condition of the passenger compartment air-conditioning refrigerant circulating system under the condition that the current temperature of the cargo compartment is not changed;
when the cargo compartment air conditioner refrigerant circulating system is in a heat preservation and cooling stage and the passenger compartment air conditioner refrigerant circulating system needs to be shut down when reaching the target temperature, the compressor (4) is stopped, the current temperature of the cargo compartment is ensured to be within the upper limit range and the lower limit range of the target temperature of the cargo compartment, and the compressor (4) is started when the passenger compartment air conditioner refrigerant circulating system sends out the operation requirement of the compressor again.
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