A method of active control of a refrigeration system

Abstract

The application provides a refrigeration system active control method, and belongs to the technical field of cold chain transportation.The method comprises the following steps: S1, at least two groups of refrigerating units and at least two groups of cold storage devices connected with the refrigerating units are arranged on a carriage, and the refrigerating units are used to pre-charge the corresponding cold storage devices; S2, the refrigerating units and the cold storage devices are started simultaneously to deliver cold air to the carriage, so as to shorten the cooling time; a temperature sensor is installed in goods to monitor the temperature of the goods, and the temperature is fed back to form a control closed loop; and S3, the multiple groups of refrigerating units are defrosted alternately to relieve the temperature fluctuation caused by the refrigerating units to the inside of the carriage.The refrigeration system active control method can quickly reduce the temperature of the carriage to a target interval, so that the goods can be in a low-temperature environment as soon as possible; the multiple groups of refrigerating units are defrosted alternately, so that the temperature in the carriage can be maintained in a stable interval; and the parameters of the refrigerating units can be adjusted to ensure that the temperature in the carriage and the temperature of the goods meet the requirements.

Description

Technical Field

[0001] This invention belongs to the field of cold chain transportation technology, and more specifically, relates to an active control method for a refrigeration system. Background Technology

[0002] As the core transport vehicle in the cold chain logistics system, the performance of the refrigeration system in refrigerated transport vehicles directly determines the quality stability and safety reliability of goods during transportation. Currently, in actual use, refrigeration systems in refrigerated transport vehicles generally suffer from slow cooling speeds during initial startup, preventing goods from reaching a low temperature in a timely manner and affecting their quality. Furthermore, during long-term operation, the refrigeration system requires defrosting, generating significant heat and causing rapid temperature fluctuations within the vehicle compartment, resulting in poor refrigeration performance. Additionally, traditional refrigeration systems typically rely on a single temperature sensor within the compartment to collect ambient temperature data and adjust refrigeration operations accordingly. However, this control method cannot accurately reflect the actual internal temperature of the goods. Factors such as cargo loading density, stacking method, packaging materials, and uneven airflow distribution within the compartment also contribute to the inability to accurately and quickly maintain the actual temperature of the goods, impacting their quality. Summary of the Invention

[0003] The purpose of this invention is to provide an active control method for a refrigeration system to solve the technical problem in the prior art where the refrigeration effect of cold chain transport vehicles is poor, making it impossible to effectively control the humidity inside the vehicle compartment and affecting the quality of goods.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is: to provide an active control method for a refrigeration system, comprising: S1: At least two sets of refrigeration units and at least two sets of cold storage devices connected to the refrigeration units are arranged on the carriage, and the corresponding cold storage devices are pre-charged with cold by the refrigeration units; S2: Simultaneously start the refrigeration unit and the cold storage equipment to deliver cold air to the carriage to shorten the cooling time; install temperature sensors inside the cargo to monitor the cargo temperature and provide temperature feedback to form a control closed loop; S3: Multiple sets of refrigeration units alternately defrost to alleviate temperature fluctuations caused by the refrigeration units inside the carriage; the humidity inside the carriage and the humidity inside the refrigeration units are controlled independently, and a humidifier is installed to humidify the air inside the carriage; the air inside the carriage is dehumidified when it enters the refrigeration units.

[0005] In one possible implementation, in S1, the cold storage device is installed on the front side of the carriage, with the air inlet of the cold storage device arranged against the bottom of the carriage and facing the rear of the carriage; the air outlet of the cold storage device is arranged against the inner wall of the front side of the carriage and facing the top of the carriage, and the fan on the cold storage device is started to form a ring loop for cold air to flow along the inner wall of the carriage.

[0006] In one possible implementation, in S1, at least two sets of air distribution mechanisms are arranged on the top of the carriage, and the air distribution mechanisms are arranged along the length of the carriage; the air distribution mechanisms are provided with multiple downward-facing air outlets, and the multiple air outlets are spaced apart along the length to form a downward flow path for cold air.

[0007] In one possible implementation, the air distribution mechanism is provided with multiple air ducts, the lower end of which is connected to the air outlet, and the air ducts and the air outlet are arranged coaxially; the multiple air outlets are divided into multiple groups, and the multiple groups of air outlets are arranged circumferentially at intervals, and the multiple air outlets in the same group are arranged along the length direction of the air distribution mechanism.

[0008] In one possible implementation, in S2, a delivery time is preset and the temperature inside the vehicle compartment is monitored; the parameters of the refrigeration unit are adjusted according to the cargo temperature and the remaining delivery time.

[0009] In one possible implementation, in S3, after the energy stored in the cold storage device is depleted, the multiple refrigeration units provide cooling and cold air.

[0010] In one possible implementation, in S1, there are two sets of refrigeration units and two sets of cold storage devices. The two sets of refrigeration units are arranged vertically side by side on the outside of the carriage, and the two sets of cold storage devices are arranged horizontally side by side on the front side of the carriage.

[0011] In one possible implementation, in S1, when the cold storage device is being charged with cold, the fan on the cold storage device is turned on to pre-cool the carriage, while the phase change material on the cold storage device is cured; when goods are being loaded into the carriage, the cold storage device is turned off, and the refrigeration unit cools the carriage.

[0012] In one possible implementation, in S3, an ultrasonic humidifier is installed to humidify the cold air generated by the self-cooling unit, and the humidified air enters the carriage; when the air in the carriage enters the cooling unit, a superhydrophobic evaporator is used to reduce the humidity; both the ultrasonic humidifier and the superhydrophobic evaporator are installed in the cooling unit.

[0013] The beneficial effects of the active control method for a refrigeration system provided by this invention are as follows: Compared with the prior art, the active control method for a refrigeration system of this invention first executes step S1, which involves arranging at least two sets of refrigeration units and corresponding at least two sets of cold storage devices on the vehicle compartment, and pre-charging the cold storage devices with the refrigeration units. This step breaks the limitations of traditional single refrigeration units. By combining refrigeration units and cold storage devices, cold energy is stored in advance, laying the foundation for subsequent rapid cooling and avoiding the cooling delay caused by insufficient cold energy reserves when traditional systems are started. After the goods are placed into the vehicle compartment, step S2 is performed, simultaneously starting the refrigeration units and cold storage devices, allowing them to work together to deliver cold air to the vehicle compartment. Compared with the traditional method of relying solely on the slow cooling of the refrigeration units, the synchronous output of dual cold sources significantly improves the efficiency of cold energy supply and can quickly shorten the cooling time of the vehicle compartment. At the same time, temperature sensors are installed inside the goods to directly monitor the actual internal temperature of the goods and feed the data back to form a control closed loop, so as to achieve precise control of the temperature inside the vehicle compartment and the temperature of the goods. During transportation, after operating for a period of time, the refrigeration units need to be defrosted. Specifically, when one set of refrigeration units enters the defrosting process, the others continue to operate normally, avoiding the sudden temperature rise in the cargo compartment caused by the interruption of cooling and heat release during defrosting, as is common with traditional single-unit refrigeration. This coordinated operation between units mitigates temperature fluctuations inside the cargo compartment caused by the defrosting process. In this way, by utilizing pre-charged cold storage equipment working synchronously with the refrigeration units, the cargo compartment temperature can be quickly lowered to the target range, ensuring the goods are quickly placed in a low-temperature environment. Secondly, the alternating defrosting by multiple refrigeration units maintains a stable temperature within the cargo compartment, preventing damage to the goods and eliminating the need for prolonged interruptions in refrigeration during defrosting, further reducing the risk of cargo quality loss. Simultaneously, a closed-loop control system formed by temperature sensors installed inside the cargo allows for real-time and accurate acquisition of the cargo's internal temperature, adjusting the refrigeration unit parameters to ensure that both the cargo compartment and cargo temperatures meet requirements. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of a refrigeration system installed in a vehicle compartment according to an embodiment of the present invention; Figure 2 A schematic diagram of the structure of the refrigeration system provided in the embodiment of the present invention. Figure 1 ; Figure 3A schematic diagram of the structure of the refrigeration system provided in the embodiment of the present invention. Figure 2 ; Figure 4 Schematic diagram of the structure of the refrigeration unit and cold storage device provided in the embodiments of the present invention. Figure 1 ; Figure 5 Schematic diagram of the structure of the refrigeration unit and cold storage device provided in the embodiments of the present invention. Figure 2 ; Figure 6 This is a schematic diagram of the structure of a cold storage device provided in an embodiment of the present invention; Figure 7 A schematic diagram of the connection between the refrigeration unit and the cold storage device provided in an embodiment of the present invention. Figure 1 ; Figure 8 A schematic diagram of the connection between the refrigeration unit and the cold storage device provided in an embodiment of the present invention. Figure 2 ; Figure 9 A schematic diagram of the air distribution mechanism provided in an embodiment of the present invention. Figure 1 ; Figure 10 A schematic diagram of the air distribution mechanism provided in an embodiment of the present invention. Figure 2 ; Figure 11 Partial schematic diagram of the air distribution mechanism provided in the embodiment of the present invention Figure 1 ; Figure 12 Partial schematic diagram of the air distribution mechanism provided in the embodiment of the present invention Figure 2 ; Figure 13 A cross-sectional view of the air distribution mechanism provided in an embodiment of the present invention; Figure 14 A schematic diagram of humidity control principle provided for an embodiment of the present invention.

[0016] The following are the labeling elements in the figure: 10. Refrigeration unit; 11. Air inlet duct; 12. Air outlet duct; 13. Air inlet cavity; 14. Opening; 15. Ventilation duct; 20. Cold storage equipment; 21. Air inlet; 22. Air outlet; 23. Housing; 24. Fan; 25. Vertical duct; 26. Through groove; 27. Cold storage pipe; 30. Air distribution mechanism; 31. Air outlet; 32. Long channel; 33. Air collection cavity; 34. Exhaust duct; 40. Chassis platform; 41. Shell; 42. Ventilation slot; 50. Carriage. Detailed Implementation

[0017] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0018] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0019] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0021] Please see Figures 1 to 14 The active control method for a refrigeration system provided by the present invention will now be described. An active control method for a refrigeration system includes: S1: arranging at least two sets of refrigeration units 10 and at least two sets of cold storage devices 20 connected to the refrigeration units 10 on the cargo compartment 50, and pre-charging the corresponding cold storage devices 20 with cold by the refrigeration units 10; S2: simultaneously starting the refrigeration units 10 and the cold storage devices 20 to deliver cold air to the cargo compartment 50 to shorten the cooling time; installing temperature sensors inside the cargo to monitor the cargo temperature and providing temperature feedback to form a control closed loop; S3: multiple sets of refrigeration units 10 alternately defrosting to alleviate temperature fluctuations caused by the refrigeration units 10 inside the cargo compartment 50; independently controlling the humidity inside the cargo compartment and the humidity inside the refrigeration units, and setting up humidifiers to humidify the air inside the cargo compartment; dehumidifying the air inside the cargo compartment when it enters the refrigeration units.

[0022] The active control method for a refrigeration system provided by this invention, compared with the prior art, firstly executes step S1, in which at least two sets of refrigeration units 10 and corresponding at least two sets of cold storage devices 20 are arranged on the compartment 50, and the cold storage devices 20 are pre-charged with cold by the refrigeration units 10. This step breaks the limitation of the traditional single refrigeration unit 10. By combining the refrigeration units 10 and the cold storage devices 20, cold energy is stored in advance, laying the foundation for subsequent rapid cooling and avoiding the cooling delay caused by insufficient cold energy reserves when the traditional system starts up. After the goods are placed into the compartment 50, step S2 is performed, in which the refrigeration units 10 and the cold storage devices 20 are started simultaneously, allowing them to work together to deliver cold air to the compartment 50. Compared with the traditional method of relying solely on the refrigeration units 10 for slow cooling, the synchronous output of dual cold sources greatly improves the efficiency of cold energy supply and can quickly shorten the cooling time of the compartment 50. Simultaneously, temperature sensors are installed inside the cargo to directly monitor the actual internal temperature and feed the data back to form a control closed loop, achieving precise control of the temperature inside the compartment 50 and the cargo temperature. During transportation, after a period of operation, the refrigeration units 10 need to be operated for defrosting. Specifically, when one set of refrigeration units 10 enters the defrosting program, the other refrigeration units 10 continue to maintain normal cooling, avoiding the sudden temperature rise in the compartment 50 caused by the suspension of cooling and heat release during defrosting of a traditional single refrigeration unit 10. The coordinated operation between the units mitigates the temperature fluctuations inside the compartment 50 caused by the defrosting process. Furthermore, the humidity inside the compartment and the humidity inside the refrigeration units are independently controlled. The air inside the compartment is humidified, and dehumidification is performed when it enters the refrigeration units, reducing frequent evaporator frosting, ensuring efficient operation of the refrigeration units, and solving the problem of frosting under high humidity conditions inside the compartment. In this way, by using the pre-cooled cold storage equipment 20 to work synchronously with the refrigeration unit 10, the temperature of the compartment 50 can be quickly reduced to the target range, so that the goods are in a low-temperature environment as soon as possible. Secondly, multiple refrigeration units 10 defrost alternately, so that the temperature inside the compartment 50 is always maintained in a stable range, ensuring that the goods are not affected and that there is no need to interrupt the refrigeration for a long time due to defrosting, further reducing the risk of damage to the quality of the goods. At the same time, the control closed loop formed by the temperature sensor installed inside the goods can obtain the internal temperature of the goods in real time and accurately, and adjust the parameters of the refrigeration unit 10 to ensure that the temperature inside the compartment 50 and the temperature of the goods meet the requirements.

[0023] Please see Figures 1 to 8As a specific embodiment of the active control method for the refrigeration system provided by the present invention, in S1, the cold storage device 20 is installed on the front side of the compartment 50. The air inlet 21 of the cold storage device 20 is arranged against the bottom of the compartment 50 and facing the rear of the compartment 50; the air outlet 22 of the cold storage device 20 is arranged against the inner wall of the front side of the compartment 50 and facing the top of the compartment 50. The fan 24 on the cold storage device 20 is started to form a ring loop for cold air to flow along the inner wall of the compartment 50. The air inlet 21 is positioned towards the rear of the compartment 50 so that the bottom air intake can absorb the low-temperature air at the rear of the compartment 50, and the top exhaust can deliver the cold air to the upper part of the compartment 50, thereby forming a ring loop for cold air to flow along the inner wall of the compartment 50, so that the cold air covers the entire area of ​​the compartment 50 and eliminates the problem of uneven cold air distribution; in addition, relying on the ring flow path, the cold air can continuously circulate along the inner wall, reducing the impact of cargo obstruction on airflow. This method significantly improves the temperature uniformity within the compartment 50, eliminates localized high or low temperature dead zones, and ensures that the goods are kept in a stable low-temperature environment. At the same time, it accelerates the cold air circulation speed and, together with the refrigeration unit 10, further shortens the cooling time, providing a more reliable guarantee for the quality of the goods.

[0024] Specifically, the cold storage device 20 is fixedly installed on the floor of the carriage 50, with one side abutting against the front wall of the carriage 50 to ensure that the cold storage device 20 is located at the front of the carriage 50 and will not affect the interior space of the carriage 50. Multiple cold storage devices 20 share a single housing 23, and the cold storage pipes 27 of the multiple cold storage devices 20 are installed in the housing 23 in layers. The exhaust vent 22 is located on the upper part of the housing 23 near the front wall of the carriage 50, while the air inlet 21 is located on the side of the housing 23 near the rear of the carriage 50. There are multiple air inlets 21, and each air inlet 21 is equipped with an axial flow fan 24. Multiple vertical ducts 25 are installed side by side on the front wall of the carriage 50. The lower end of the vertical duct 25 connects to the exhaust vent 22, and the upper end extends upward to guide the cold air upward.

[0025] The refrigeration unit 10 is equipped with an air inlet duct 11 and two air outlet ducts 12. The air inlet duct 11 is connected to the interior of the carriage 50, and the two air outlet ducts 12 are connected to the corresponding cold storage equipment 20 and the air distribution mechanism 30, respectively. A frame platform 40 and a housing 41 are installed on the front side of the carriage 50, and multiple refrigeration units 10 are located inside the housing 41. Multiple ventilation slots 42 are opened on the bottom plate of the carriage 50 below the housings 23, and the ventilation slots 42 are connected to the interior of the housing 41 and the air inlet duct 11. This structure creates a protective space for the refrigeration unit 10 and an airflow circulation channel inside and outside the carriage 50. The housing 41 protects the refrigeration unit 10 from external interference, while the frame platform 40 makes the installation position of the refrigeration unit 10 more stable and maintains a reasonable distance from the carriage 50, reducing the heat transfer of the refrigeration unit 10 to the carriage 50. The ventilation slots 42 form an airflow loop so that the refrigeration unit 10 can draw in cold air from the carriage 50 during operation. Each refrigeration unit 10 includes a compressor, evaporator, condenser, and expansion valve, while each cold storage device 20 also has an evaporator. The evaporators in the corresponding refrigeration units 10 and cold storage devices 20 are arranged in parallel. The low-temperature airflow generated by the evaporator of the refrigeration unit 10 is blown out through the air duct of the parallel air distribution mechanism 30, while the low-temperature airflow generated by the evaporator of the parallel cold storage device 20 is blown out by its own axial flow fan 24. A through slot 26 is opened on the bottom plate of the housing 23 above the ventilation slot 42, further increasing the ventilation cross-sectional area between the interior of the carriage 50 and the shell 41.

[0026] The refrigeration unit 10 also includes at least one air inlet cavity 13 opened on the front wall of the carriage 50, and two air outlet ducts 12 are connected to the corresponding air inlet cavity 13; one end of the air distribution mechanism 30 is connected to the front wall of the carriage 50. The two air outlet ducts 12 are an opening 14 and a ventilation pipe 15, respectively. The opening 14 is opened on the side of the front wall of the carriage 50 located inside the carriage 50, and the opening 14 is connected to the air inlet cavity 13, while the two ends of the ventilation pipe 15 are connected to the air inlet cavity 13 and the cold storage device 20, respectively.

[0027] Please see Figures 1 to 13As a specific embodiment of the active control method for the refrigeration system provided by the present invention, in S1, at least two sets of air distribution mechanisms 30 are arranged on the top of the carriage 50, and the air distribution mechanisms 30 are arranged along the length direction of the carriage 50; the air distribution mechanisms 30 are provided with multiple downward-facing air outlets 31, and the multiple air outlets 31 are spaced apart along the length direction to form a flow path of cold air from top to bottom. Therefore, the multiple sets of air distribution mechanisms 30 arranged along the length direction of the carriage 50 can cover the entire area of ​​the carriage 50, avoiding the problem of cold air not covering local areas under the traditional air distribution method; the multiple spaced and downward-facing air outlets 31 can allow cold air to be delivered evenly and stably from top to bottom, which conforms to the natural sinking characteristics of cold air and reduces airflow turbulence. The benefits of this design are significant. On the one hand, the downward flow of cold air can quickly penetrate to all levels of the cargo stack, eliminating temperature stratification caused by cargo stacking and preventing situations where the upper layer of cargo is warmer than the lower layer, thus greatly improving the temperature uniformity within the compartment 50. On the other hand, for the transport of goods without proper documentation, the stable downward airflow reduces the obstruction of the cold air flow by the cargo, accelerating the efficiency of cold energy transfer. Combined with the refrigeration unit 10 and the cold storage equipment 20, it can further shorten the cooling time, allowing the cargo to reach the target low temperature state more quickly. At the same time, during the defrosting stage, this air distribution method can maintain a stable distribution of cold energy within the compartment 50, reduce temperature fluctuations, provide a more precise and reliable storage environment, and effectively protect the quality of the goods.

[0028] Please see Figures 9 to 13As a specific embodiment of the active control method for the refrigeration system provided by the present invention, the air distribution mechanism 30 is provided with multiple air ducts 34 inside, the lower end of the air ducts 34 is connected to the air outlet 31, and the air ducts 34 and the air outlet 31 are arranged coaxially; the multiple air outlets 31 are divided into multiple groups, and the multiple groups of air outlets 31 are arranged circumferentially at intervals, and the multiple air outlets 31 in the same group are arranged along the length direction of the air distribution mechanism 30; the air distribution mechanism 30 includes several elongated channels 32 arranged at intervals, the elongated channels 32 have air collecting chambers 33, and the air outlets 31 are opened on the outer wall of the elongated channels 32 and connected to the air collecting chambers 33; one end of the elongated channels 32 is connected to the refrigeration unit 10; the number of air outlets 31 is multiple, and they are divided into multiple groups; the multiple groups of air outlets 31 are arranged circumferentially at intervals, and the multiple air outlets 31 in the same group are arranged along the length direction of the elongated channels 32; thus forming a segmented, multi-directional air outlet structure, thereby achieving precise and comprehensive distribution of cold air. By utilizing elongated channels 32 arranged along the length of the carriage 50, and in conjunction with multiple sets of circumferentially spaced air outlets 31, cold air can cover the carriage 50 from different directions, avoiding localized temperature differences caused by traditional single air outlets. The multiple air outlets 31 arranged along the length of the carriage 50 ensure uniform longitudinal cooling, and the air collection chamber 33 can temporarily store cold air, stabilizing the air pressure. The design of several spaced elongated channels 32 further enhances the coverage of cold air in the width direction of the carriage 50. The cold air within the carriage 50 achieves a three-dimensional, uniform distribution in the longitudinal, lateral, and multi-directional directions, significantly reducing temperature differences between different areas. The air duct 34 directs the cold air within the air collection chamber 33, enhancing the accuracy and stability of the airflow. The coaxially arranged air duct 34 prevents airflow turbulence at the air outlet 31, reduces wind resistance and cold air loss, and ensures efficient delivery of cold air along the preset direction. The air duct 34 corresponds one-to-one with the air outlet 31, allowing independent guidance for each air outlet, adapting to the cooling needs of different areas within the carriage 50, especially for delivering cold air to areas with dense cargo. The fixed structure of the air duct 34 also enhances the overall strength of the long channel 32, improving the anti-bumping capability of the air distribution mechanism 30. This structure significantly improves cold air delivery efficiency, accelerates cooling, and accurately covers all target areas of the carriage 50, further reducing temperature differences between different locations. Furthermore, it enhances airflow stability, preventing localized cold air accumulation or insufficiency caused by airflow turbulence, ensuring uniform heating of the cargo.

[0029] As a specific implementation of the active control method for the refrigeration system provided by this invention, in step S2, a delivery time is preset, and the temperature inside the compartment 50 is monitored; the parameters of the refrigeration unit 10 are adjusted according to the cargo temperature and the remaining delivery time. Step S2 innovatively combines delivery time with temperature monitoring to form a dynamic refrigeration adjustment logic; a complete delivery time is preset, and the ambient temperature inside the compartment 50 and the internal temperature of the cargo are monitored simultaneously during operation. Then, based on the real-time temperature of the cargo and the remaining delivery time, the operating parameters of the refrigeration unit 10 (such as compressor power, refrigerant circulation rate, etc.) are flexibly adjusted. This approach breaks the fixed parameter operation mode of traditional refrigeration systems, using "remaining time" as an important control basis, making the refrigeration strategy more forward-looking. It does not require maintaining the highest refrigeration intensity throughout the entire process, but rather rationally allocates cooling capacity according to the remaining transportation time; at the same time, it combines the actual temperature of the cargo rather than relying solely on the ambient temperature of the compartment 50 for adjustment, ensuring that the control direction is highly matched with the actual needs of the cargo, avoiding ineffective or insufficient refrigeration. By using this method, dynamically adjusting refrigeration parameters can significantly reduce energy consumption. For example, when the remaining delivery time is short and the goods temperature has reached the standard, the power of the refrigeration unit can be appropriately reduced by 10%, reducing fuel or electricity consumption and lowering the company's operating costs. At the same time, it avoids goods freezing due to over-refrigeration or quality deterioration due to insufficient refrigeration, accurately matching the temperature control requirements of goods at different stages of transportation. Furthermore, if road conditions change during transportation (such as delays), the system can also adjust in a timely manner based on the updated remaining time to ensure stable goods temperature throughout the entire process, further improving the reliability and flexibility of cold chain transportation.

[0030] Please see Figures 1 to 8 As a specific embodiment of the active control method for the refrigeration system provided by the present invention, in S3, after the energy stored in the cold storage device 20 is depleted, multiple refrigeration units 10 provide cooling and cold air. Initially, the refrigeration units 10 and the cold storage device 20 work synchronously to rapidly reduce the temperature inside the carriage 50, meeting transportation needs. When the pre-stored cold energy in the cold storage device 20 is depleted, the system automatically switches to multiple refrigeration units 10 for cooling and continuous supply of cold air. The cold storage device 20 can rapidly release cold energy during initial startup, helping to shorten the cooling time, and generates no additional heat during operation, reducing temperature fluctuations in the carriage 50. When the cold energy is depleted, multiple refrigeration units 10 continue to work. Relying on the collaborative operation of multiple refrigeration units 10, the continuity of cold energy supply is ensured, and overload of a single unit is avoided through load distribution among the units. Simultaneously, the system automatically monitors the cold energy storage and triggers switching to ensure uninterrupted cold energy supply.

[0031] Please see Figures 1 to 8As a specific implementation of the active control method for the refrigeration system provided by the present invention, in S1, there are two sets of refrigeration units 10 and two sets of cold storage devices 20. The two sets of refrigeration units 10 are arranged vertically side by side on the outside of the carriage 50, and the two sets of cold storage devices 20 are arranged horizontally side by side on the front side inside the carriage 50. The arrangement of the two sets of refrigeration units 10 vertically side by side on the outside of the carriage 50 and the two sets of cold storage devices 20 horizontally side by side on the front side inside the carriage 50 forms a layout structure with the external unit external and the internal unit layered. The external placement of the refrigeration unit 10 prevents heat generated during operation from directly entering the cargo compartment 50, reducing interference with the low-temperature environment inside the compartment 50. Simultaneously, the vertically arranged side-by-side design saves lateral space on the outside of the compartment 50, adapting to the external structure of most transport vehicles. The cold storage equipment 20 is horizontally arranged vertically on the front side of the compartment 50, fully utilizing the vertical space at the front of the compartment 50, avoiding encroachment on the core cargo storage area, and allowing the cold air output of the two sets of cold storage equipment 20 to complement each other, covering a wider area of ​​the compartment 50. Furthermore, this layout results in shorter piping between the refrigeration unit 10 and the cold storage equipment 20, reducing cold loss during transmission. It also optimizes the spatial layout, increasing the effective cargo capacity of the compartment 50, reducing the equipment's encroachment on cargo space, and the external placement of the refrigeration unit 10 reduces heat transfer, while the stratified cold air output of the cold storage equipment 20 further improves cooling efficiency and shortens cooling time.

[0032] Please see Figures 1 to 8 , Figure 14As a specific implementation of the active control method for the refrigeration system provided by the present invention, in S1, when charging the cold storage device 20, the fan 24 on the cold storage device 20 is turned on to pre-cool the compartment 50, and the phase change material on the cold storage device 20 is solidified at the same time; when loading goods into the compartment 50, the cold storage device 20 is turned off, and the refrigeration unit 10 is used to cool the compartment 50; the charging process of the cold storage device 20 is combined with the pre-cooling requirements of the compartment 50, and the characteristics of the phase change material are used to achieve precise control of cold storage and release. When charging the cold storage device 20, its fan 24 is turned on to pre-cool the compartment 50, and the solidification of the phase change material in the cold storage device 20 is promoted simultaneously (the solidification process of the phase change material can absorb and store a large amount of cold); when loading goods into the compartment 50, the cold storage device 20 is turned off, and the refrigeration unit 10 is switched to cool the compartment 50 alone. The cold energy generated during the charging process of the cold storage device 20 is no longer wasted, but is directly used to reduce the initial temperature of the compartment 50. The phase change material solidifies simultaneously, preparing for rapid cooling in the subsequent transportation stage. Furthermore, switching the refrigeration unit 10 during loading avoids airflow disturbances that may occur during the operation of the cold storage device 20, thus preventing them from affecting cargo stacking. In this way, the overall refrigeration preparation time is significantly shortened. Charging and pre-cooling are carried out simultaneously, allowing the compartment 50 to reach a near-target low temperature before loading. After loading, there is no need for prolonged cooling, reducing the time the cargo is exposed to high-temperature environments. At the same time, the efficient cold storage characteristics of the phase change material reduce the load on the refrigeration unit 10 in subsequent stages.

[0033] Please see Figure 14This invention provides a specific implementation of the active control method for a refrigeration system, outlining its humidity control principle. In step S3, an ultrasonic humidifier humidifies the cold air generated by the self-cooling unit, and the humidified air enters the vehicle compartment. When the air from the compartment enters the refrigeration unit, a superhydrophobic evaporator reduces the humidity. Both the ultrasonic humidifier and the superhydrophobic evaporator are installed within the refrigeration unit. Taking the transport of white goods as an example, a humidity separation method is used. Higher humidity needs to be maintained inside the compartment to reduce water loss from the white goods; the humidity of the air entering the evaporator must be low to avoid frost formation and reduced refrigeration efficiency. There is a conflict in humidity parameters within the same air circulation system. By using a superhydrophobic evaporator for dehumidification and an ultrasonic humidifier for humidification, combined with sensor detection and control, both refrigeration efficiency is improved and water loss from the white goods is reduced. The system involves adding 100% refrigerant after compression and condensation via a three-way valve. A portion of this refrigerant enters the superhydrophobic evaporator through the three-way valve, while the remainder enters the evaporator itself. Temperature and humidity sensors detect and provide feedback to adjust the refrigerant distribution via the three-way valve. Because the humidity is reduced to below 50% after dehumidification by the superhydrophobic evaporator, the evaporator's frosting time is extended, and its heat exchange efficiency is improved. Both the ultrasonic humidifier and the superhydrophobic evaporator are installed in the return air chamber of the refrigeration unit. The ultrasonic humidifier is connected to the air distribution mechanism, and the humidified cool air is delivered into the exhaust duct. The superhydrophobic evaporator reduces the humidity of the air inside the vehicle before it enters the evaporator chamber of the refrigeration unit.

[0034] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An active control method for a refrigeration system, characterized in that, include: S1: At least two sets of refrigeration units and at least two sets of cold storage devices connected to the refrigeration units are arranged on the carriage, and the corresponding cold storage devices are pre-charged with cold by the refrigeration units; S2: Simultaneously start the refrigeration unit and the cold storage equipment to deliver cold air to the carriage to shorten the cooling time; install temperature sensors inside the cargo to monitor the cargo temperature and provide temperature feedback to form a control closed loop; S3: Multiple sets of refrigeration units alternately defrost to alleviate temperature fluctuations caused by the refrigeration units inside the carriage; the humidity inside the carriage and the humidity inside the refrigeration units are controlled independently, and a humidifier is installed to humidify the air inside the carriage; the air inside the carriage is dehumidified when it enters the refrigeration units; In S3, an ultrasonic humidifier humidifies the cold air generated by the self-refrigeration unit, and the humidified air enters the passenger compartment. When the air in the passenger compartment enters the refrigeration unit, a superhydrophobic evaporator reduces the humidity. Both the ultrasonic humidifier and the superhydrophobic evaporator are installed inside the refrigeration unit. 100% refrigerant, after compression and condensation, is added via a three-way valve. A portion enters the superhydrophobic evaporator through the three-way valve, and the other portion enters the evaporator. Temperature and humidity sensors detect and provide feedback to adjust the refrigerant distribution via the three-way valve. Because the humidity is reduced to below 50% after being discharged by the superhydrophobic evaporator, the evaporator's frosting time is extended, and its heat exchange efficiency is improved. Both the ultrasonic humidifier and the superhydrophobic evaporator are installed in the return air chamber of the refrigeration unit. The ultrasonic humidifier is connected to the air distribution mechanism, and the cold air humidified by the ultrasonic humidifier is sent to the exhaust duct. The superhydrophobic evaporator reduces the humidity of the air in the passenger compartment before it enters the evaporation chamber of the refrigeration unit.

2. The active control method for a refrigeration system as described in claim 1, characterized in that, In S1, the cold storage device is installed on the front side of the carriage. The air inlet of the cold storage device is arranged against the bottom of the carriage and facing the rear of the carriage. The air outlet of the cold storage device is arranged against the inner wall of the front side of the carriage and facing the top of the carriage. The fan on the cold storage device is started to form a ring loop for cold air to flow along the inner wall of the carriage.

3. The active control method for a refrigeration system as described in claim 2, characterized in that, In S1, at least two sets of air distribution mechanisms are arranged on the top of the carriage, and the air distribution mechanisms are arranged along the length of the carriage; the air distribution mechanisms are provided with multiple downward-facing air outlets, and the multiple air outlets are arranged at intervals along the length to form a downward flow path of cold air.

4. The active control method for a refrigeration system as described in claim 3, characterized in that, The air distribution mechanism is equipped with multiple air intake pipes, the lower end of which is connected to the air outlet. The air intake pipes and the air outlet are arranged coaxially. The multiple air outlets are divided into multiple groups, and the multiple groups of air outlets are arranged circumferentially at intervals. The multiple air outlets in the same group are arranged along the length of the air distribution mechanism.

5. The active control method for a refrigeration system as described in claim 1, characterized in that, In S2, the delivery time is preset and the temperature inside the vehicle compartment is monitored; the parameters of the refrigeration unit are adjusted according to the temperature of the goods and the remaining delivery time.

6. The active control method for a refrigeration system as described in claim 1, characterized in that, In S3, after the energy stored in the cold storage device is depleted, multiple refrigeration units provide cooling and cold air.

7. The active control method for a refrigeration system as described in claim 1, characterized in that, In S1, there are two sets of refrigeration units and two sets of cold storage equipment. The two sets of refrigeration units are arranged vertically side by side on the outside of the carriage, and the two sets of cold storage equipment are arranged horizontally side by side on the front of the carriage.

8. The active control method for a refrigeration system as described in claim 1, characterized in that, In S1, when the cold storage device is charged with cold, the fan on the cold storage device is turned on to pre-cool the carriage, and the phase change material on the cold storage device is cured at the same time; when the cargo is loaded into the carriage, the cold storage device is turned off, and the refrigeration unit cools the carriage.

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