Vehicle-mounted refrigerator refrigerating system, control method thereof and vehicle-mounted refrigerator

Abstract

The invention relates to a vehicle-mounted refrigerator refrigerating system, a control method of the vehicle-mounted refrigerator refrigerating system and a vehicle-mounted refrigerator. The refrigerating system of the vehicle-mounted refrigerator comprises a first evaporator, a compressor and a first temperature sensor, the first temperature sensor is arranged on the first evaporator and used for collecting the pipe wall temperature of the outlet side of the first evaporator, and the first evaporator is used for adjusting the temperature of a first refrigerator body. The method comprises the steps that under the condition that a first refrigerator body of the vehicle-mounted refrigerator has a refrigeration requirement and a second refrigerator body of the vehicle-mounted refrigerator does not have the refrigeration requirement, a first pipe wall temperature collected by a first temperature sensor is obtained, the first pipe wall temperature is compared with a temperature set value of the first refrigerator body, and when the first pipe wall temperature is lower than the preset temperature set value of the first refrigerator body, the second pipe wall temperature is controlled to be lower than the preset temperature set value of the first refrigerator body. And under the condition that the temperature difference between the first pipe wall temperature and the temperature set value is larger than a preset first temperature difference threshold value, the rotating speed of a compressor of the vehicle-mounted refrigerator is reduced. By adopting the method, finer partition temperature control can be realized.

Description

Technical Field

[0001] This application relates to the field of equipment control technology, and in particular to a vehicle-mounted refrigerator refrigeration system and its control method, device, computer equipment, computer-readable storage medium and computer program product, as well as a vehicle-mounted refrigerator. Background Technology

[0002] A car refrigerator is a small refrigeration device specifically designed for car travel. It can be connected to the car's power system, such as the cigarette lighter socket, or directly to the car battery to keep food and drinks cool or frozen during the journey. Car refrigerators are becoming increasingly popular due to their versatility and ease of use.

[0003] Currently, most multi-compartment car refrigerators on the market are either purely parallel or purely series-connected. Purely parallel designs can only cool one compartment at a time, resulting in a slower cooling speed, while purely series designs cannot provide individual temperature control for each compartment.

[0004] Therefore, there is a need to provide a method that can achieve accurate zoned temperature control for multi-compartment vehicle-mounted refrigerators. Summary of the Invention

[0005] Based on this, it is necessary to address the aforementioned technical problems by providing a vehicle-mounted refrigerator refrigeration system and its control method that can achieve accurate zoned temperature control, as well as a vehicle-mounted refrigerator.

[0006] In a first aspect, this application provides a control method for a vehicle-mounted refrigerator refrigeration system. The vehicle-mounted refrigerator includes a first compartment and a second compartment, and the vehicle-mounted refrigerator refrigeration system includes:

[0007] The method comprises: a first evaporator, a compressor, and a first temperature sensor, wherein the first temperature sensor is disposed in the first evaporator and is used to collect the pipe wall temperature on the outlet side of the first evaporator; the first evaporator is used to regulate the temperature of the first housing; the method includes:

[0008] When the first chamber has a cooling requirement and the second chamber does not have a cooling requirement, the first pipe wall temperature collected by the first temperature sensor is obtained.

[0009] Compare the temperature of the first pipe wall with the temperature set value of the first chamber.

[0010] When the temperature of the first pipe wall is lower than the temperature setting value of the first housing, and the temperature difference between the first pipe wall temperature and the temperature setting value is greater than a preset first temperature difference threshold, the speed of the compressor is reduced.

[0011] Secondly, this application also provides a refrigeration system for a vehicle refrigerator, the refrigeration system comprising: a first evaporator, a first temperature sensor, a compressor and a controller, wherein the first temperature sensor is disposed on the first evaporator and is used to collect the pipe wall temperature on the outlet side of the first evaporator, the first evaporator is used to regulate the temperature of the first compartment of the vehicle refrigerator, and the controller is connected to the first evaporator, the compressor and the first temperature sensor respectively.

[0012] The controller is used to execute the steps in the control method embodiment of the vehicle-mounted refrigerator refrigeration system described above.

[0013] Thirdly, this application also provides a vehicle-mounted refrigerator, including the aforementioned vehicle-mounted refrigerator refrigeration system.

[0014] The aforementioned vehicle-mounted refrigerator refrigeration system and its control method, along with the vehicle-mounted refrigerator, utilize a first temperature sensor installed on the first evaporator to monitor the pipe wall temperature at the evaporator outlet side in real time and accurately. This allows for a clear understanding of the evaporator's operating status and refrigeration effect. When the first pipe wall temperature is detected to be lower than the set temperature of the first compartment, and the temperature difference exceeds a certain temperature difference threshold, it indicates excessive refrigeration capacity. By automatically reducing the compressor speed, the refrigerant flow can be reduced, unnecessary energy consumption can be decreased, and the possibility of frost formation or even compressor damage due to overcooling in the first compartment can be reduced. The entire solution allows for more precise independent temperature control of individual compartments, even if only a single compartment requires cooling, without affecting the temperature status of other compartments. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a flowchart illustrating the control method of a vehicle-mounted refrigerator refrigeration system in one embodiment;

[0017] Figure 2 This is a flowchart illustrating the control method of the vehicle-mounted refrigerator refrigeration system in another embodiment;

[0018] Figure 3 This is a flowchart illustrating the control method of the vehicle-mounted refrigerator refrigeration system in yet another embodiment;

[0019] Figure 4 This is a detailed flowchart illustrating the control method of a vehicle-mounted refrigerator refrigeration system in one embodiment;

[0020] Figure 5 This is a structural block diagram of a vehicle-mounted refrigerator refrigeration system in one embodiment;

[0021] Figure 6 This is a structural block diagram of the vehicle-mounted refrigerator refrigeration system in another embodiment;

[0022] Figure 7 This is a structural block diagram of the vehicle-mounted refrigerator refrigeration system in yet another embodiment;

[0023] Figure 8 This is a structural block diagram of the vehicle-mounted refrigerator refrigeration system in another embodiment;

[0024] Figure 9 This is a structural block diagram of the control device for a vehicle-mounted refrigerator refrigeration system in one embodiment;

[0025] Figure 10 This is an internal structural diagram of a computer device in one embodiment. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0027] In one embodiment, such as Figure 1 As shown, a control method for a vehicle-mounted refrigerator refrigeration system is provided. This embodiment uses the application of this method to a vehicle-mounted refrigerator as an example for illustration. It can be understood that this method can also be applied to a server, and can also be applied to a system including a vehicle-mounted refrigerator and a server, and can be implemented through the interaction between the vehicle-mounted refrigerator and the server.

[0028] In this embodiment, the vehicle refrigerator includes a first compartment and a second compartment. The vehicle refrigerator refrigeration system includes a first evaporator, a compressor, and a first temperature sensor. The first temperature sensor is disposed on the first evaporator and is used to collect the pipe wall temperature on the outlet side of the first evaporator. The first evaporator is used to regulate the temperature of the first compartment.

[0029] Specifically, the method includes the following steps S200 to S600:

[0030] S200, when the first compartment of the vehicle refrigerator has a cooling requirement and the second compartment does not have a cooling requirement, acquires the first pipe wall temperature collected by the first temperature sensor.

[0031] The first tube wall temperature refers to the tube wall temperature of the first evaporator. This temperature reflects the operating status of the evaporator and the internal temperature of the first chamber. Temperature sensors include, but are not limited to, NTC (Negative Temperature Coefficient Thermistor Temperature Sensor) and other types of temperature sensors.

[0032] In this embodiment, the first evaporator and the second evaporator of the vehicle refrigerator can be connected in sequence (i.e., in series). The outlet of the solenoid valve is connected to the first evaporator and the second evaporator in sequence, that is, the first evaporator is close to the outlet of the solenoid valve. Specifically, it can be connected to the outlet of the solenoid valve through a capillary tube.

[0033] In practical applications, when only the first compartment requires cooling while the second compartment does not, the solenoid valve activates the capillary tube, and the compressor operates at a preset speed. The refrigerant is compressed under high pressure and sent to the condenser for heat dissipation. The refrigerant is depressurized through a throttling device such as a capillary tube or expansion valve, becoming a low-temperature, low-pressure state. Subsequently, the refrigerant preferentially flows through the first evaporator, where it absorbs heat from the first compartment and evaporates, thus lowering the temperature inside the compartment. Throughout the cooling process, the first temperature sensor continuously monitors the temperature of the first pipe wall on the outlet side of the first evaporator and sends the first pipe wall temperature to the control module of the vehicle refrigerator.

[0034] S400 compares the first pipe wall temperature with the temperature setpoint of the first chamber.

[0035] In a refrigeration system, the temperature setpoint of the first cabinet refers to the temperature the user expects to reach inside the first cabinet. The evaporator wall temperature, on the other hand, is the temperature at which the refrigerant evaporates within the evaporator. Because the refrigerant absorbs a significant amount of heat when changing from a liquid to a gaseous state inside the evaporator, this process lowers the evaporator wall temperature. Therefore, the wall temperature is typically lower than the cabinet's temperature setpoint. For example, if the cabinet's temperature setpoint is 4°C, the evaporator wall temperature might be -5°C or lower to effectively extract heat from the cabinet and reach the set temperature.

[0036] After receiving the first pipe wall temperature, the control module can compare the first pipe wall temperature with the temperature set value of the first chamber to determine whether there is an overcapacity in cooling.

[0037] S600, when the temperature of the first pipe wall is lower than the preset temperature setting value of the first chamber, and the temperature difference between the first pipe wall temperature and the temperature setting value is greater than the preset first temperature difference threshold, the speed of the compressor of the vehicle refrigerator is reduced.

[0038] The first temperature difference threshold can be obtained based on a large amount of experimental and empirical data, and can reflect the value of excess cooling capacity of the first evaporator and the amount of refrigerant remaining inside.

[0039] Following the previous step, if the temperature of the first pipe wall is lower than the set temperature of the first housing, and the temperature difference between the two is greater than a preset first temperature difference threshold (e.g., 10°C), it indicates excessive cooling capacity. There may still be unevaporated refrigerant in the first evaporator, potentially causing the first housing temperature to be too low. Simultaneously, this refrigerant may also flow into the second evaporator, causing the second housing temperature to be too low, and even damaging the compressor. Therefore, the control module needs to reduce the compressor speed to decrease the refrigerant flow, thereby reducing the cooling capacity and preventing the second housing temperature from becoming too low. Furthermore, if the temperature difference between the first pipe wall temperature and the set housing temperature is greater than the preset temperature difference threshold, it indicates that a higher cooling capacity is required in the first housing. Therefore, in this case, the compressor speed will be reduced less to maintain a higher level of cooling capacity.

[0040] In practical applications, there are several ways to reduce the compressor speed. In one embodiment, reducing the compressor speed includes using variable frequency drive and gradually downshifting the speed.

[0041] For example, the compressor motor can be connected to a frequency converter, which can change the frequency of the AC power supplied to the motor. When the control module determines that the cooling demand needs to be changed and the compressor speed needs to be reduced, the control module sends a control signal to the frequency converter to indicate the compressor speed. The frequency converter reduces its output frequency according to the received signal. As the frequency decreases, the motor speed will decrease smoothly accordingly, thereby reducing the cooling capacity and reducing the possibility of overcooling. Specifically, the speed can be reduced in stages, or it can be reduced by adjusting the speed per second, for example, by 10 rad / min (revolutions per minute).

[0042] The term "gradual downshifting" refers to the compressor motor switching between different preset speeds. In practice, when the control module determines that the cooling demand needs to be changed and the compressor speed needs to be reduced, the control module lowers the compressor speed by one level. For example, if the current compressor speed is at the first level (e.g., 3000 r / min), the compressor speed is switched to the second level (e.g., 2500 r / min); if the current compressor speed is at the second level (e.g., 2500 r / min), the compressor speed is switched to the third level (e.g., 2000 r / min). The first level speed is higher than the second level speed, and the second level speed is higher than the third level speed.

[0043] In this embodiment, by providing a step-down method, the compressor speed can be reduced simply and quickly.

[0044] It is understandable that the above-mentioned first temperature difference threshold of 10 degrees Celsius is only for illustrative purposes, and the specific value can be determined according to the actual situation.

[0045] In the control method of the aforementioned vehicle-mounted refrigerator refrigeration system, the pipe wall temperature at the outlet side of the first evaporator is monitored in real time by a first temperature sensor. This allows for monitoring of the evaporator's operating status and refrigeration effect. When the first pipe wall temperature is detected to be lower than the set temperature of the first compartment, and the temperature difference exceeds a certain temperature difference threshold, it indicates excessive refrigeration capacity. By automatically reducing the compressor speed, the refrigerant flow can be reduced, unnecessary energy consumption can be decreased, and the possibility of frost formation or even compressor damage due to overcooling of the first compartment can be reduced. The entire solution allows for more precise independent temperature control of individual compartments, even if only a single compartment requires cooling, without affecting the temperature status of other compartments.

[0046] In addition to the method of comparing the first tube wall temperature of the first evaporator with the set value of the first chamber in the previous embodiment, the first tube wall temperature can also be compared with the actual internal temperature of the first chamber. For example... Figure 2 As shown, in one embodiment, the method further includes:

[0047] S420: Obtain the internal temperature of the first chamber and compare the first pipe wall temperature with the internal temperature of the first chamber.

[0048] S620, when the temperature of the first pipe wall is lower than the temperature inside the first housing, and the temperature difference between the first pipe wall temperature and the temperature inside the first housing is greater than a preset first temperature difference threshold, the speed of the compressor is reduced, wherein the speed reduction is greater than the speed reduction when the temperature difference between the first pipe wall temperature and the temperature set value of the first housing is greater than the preset first temperature difference threshold, and the preset second temperature difference threshold is greater than the preset first temperature difference threshold.

[0049] Normally, if the refrigerant charge is excessive, or if the size and design of the refrigeration system exceed actual needs, the refrigeration system may overcool the cabinet, resulting in an excessively low internal temperature. Therefore, the internal temperature will typically be lower than the set temperature. Thus, in this embodiment, the second temperature difference threshold is greater than the preset first temperature difference threshold, which can be 12°C.

[0050] In car refrigerators, multiple temperature sensors are typically installed at different locations inside the refrigerator compartment to accurately measure the internal temperature, ensuring comprehensive temperature distribution information. Specifically, one or more temperature sensors may be installed in key areas within the first compartment to cover the entire compartment's temperature monitoring needs and obtain accurate internal temperature data. The evaporator absorbs heat from the surrounding environment to achieve cooling. When the refrigerant changes from a liquid to a gaseous state in the evaporator, it absorbs heat from the inside of the refrigerator, causing the air temperature inside to drop. Therefore, during this process, the evaporator wall temperature is lower than the air temperature inside the refrigerator.

[0051] In practice, the control module can periodically or in real-time read temperature sensor data from inside the first housing to obtain the internal temperature of the first housing. The first temperature sensor remains installed on the outlet side of the first evaporator to monitor the pipe wall temperature. Subsequently, the first pipe wall temperature is compared with the internal temperature in real time. When the first pipe wall temperature is lower than the internal temperature of the first housing, and the temperature difference between the two exceeds a preset second temperature difference threshold (e.g., 12°C), it also indicates excessive cooling capacity. There may still be unevaporated refrigerant in the first evaporator, potentially causing the first housing temperature to be too low. This refrigerant may also flow into the second evaporator, causing the second housing temperature to be too low, and even damaging the compressor. Therefore, the control module needs to reduce the compressor speed to decrease the refrigerant flow, thereby reducing the cooling capacity and preventing the first housing temperature from becoming too low. Specifically, when comparing the temperature of the first pipe wall with the temperature inside the chamber, and the temperature difference between the first pipe wall and the temperature inside the chamber is greater than the preset second temperature difference threshold, it means that the cooling capacity needs to be reduced more quickly. Therefore, compared to the case where the temperature difference between the first pipe wall and the set value of the chamber is greater than the temperature difference threshold, and the speed needs to be reduced, the speed reduction will be greater in order to quickly reduce the cooling capacity.

[0052] In this embodiment, the second temperature difference threshold of 12°C is only for illustrative purposes. It is understood that in other embodiments, the first temperature difference threshold may also be equal to the second temperature difference threshold.

[0053] In this embodiment, by acquiring the internal temperature of the cabinet and comparing it with the pipe wall temperature, the cooling demand can be determined more accurately, thereby enabling more precise temperature control.

[0054] Unlike the above embodiment which uses only one temperature sensor on the first evaporator, multiple temperature sensors can also be used on the first evaporator. For example... Figure 3 As shown, in one embodiment, the method further includes:

[0055] S440, acquire the second pipe wall temperature collected by the second temperature sensor. The second temperature sensor is set in the first evaporator and is used to collect the pipe wall temperature on the inlet side of the first evaporator.

[0056] S640 reduces the compressor speed when the first pipe wall temperature equals the second pipe wall temperature.

[0057] or,

[0058] S680, when the first pipe wall temperature is lower than the second pipe wall temperature and the temperature difference between the first pipe wall temperature and the second pipe wall temperature is lower than a preset third temperature difference threshold, the compressor speed is reduced.

[0059] In this embodiment, two temperature sensors can be used for the first evaporator: one temperature sensor is located at the inlet side of the first evaporator to collect the tube wall temperature at the outlet side, and the other temperature sensor is located at the outlet side to collect the temperature at the outlet side. The temperature sensors can be NTC temperature sensors. Normally, when the refrigeration system is operating normally and the cooling effect is as expected, since the refrigerant first flows through the evaporator inlet side, most of the refrigerant evaporates within the evaporator tubes. During evaporation, the refrigerant absorbs a large amount of heat, resulting in a lower tube wall temperature at the inlet side. If most of the refrigerant has evaporated within the evaporator tubes, only a small amount or no refrigerant will flow through the outlet side. Therefore, when the cooling effect is as expected, the tube wall temperature at the inlet side must be higher than the tube wall temperature at the outlet side; that is, the second tube wall temperature must be higher than the first tube wall temperature. Furthermore, based on extensive experimental data and experience, a third temperature difference threshold can be set to indicate that the refrigerant has completely evaporated. If the temperature difference is lower than this third temperature difference threshold, or if the first tube wall temperature is equal to the second tube wall temperature, the refrigerant is considered not to have completely evaporated. It is understandable that the temperature difference between the inlet and outlet walls of the evaporator reflects the phase change process of the refrigerant in the evaporator, from a high-pressure liquid to a low-pressure gas, accompanied by a significant temperature drop. Therefore, this temperature difference can range from a few degrees to more than ten degrees, depending on the operating conditions and design of the refrigeration system. In this embodiment, the third temperature difference threshold can be set to 3°C.

[0060] In practice, the control module can periodically read the first and second pipe wall temperatures collected by the first and second NTCs, respectively, and calculate the temperature difference between them. If the first pipe wall temperature (inlet side) is equal to the second pipe wall temperature (outlet side), or if the first pipe wall temperature is lower than the second pipe wall temperature, but the temperature difference is less than 3°C, this indicates that the cooling capacity of the first evaporator is excessive, and unevaporated refrigerant may flow through the outlet side of the first evaporator, or even into the second evaporator. Therefore, in this case, the compressor speed can be reduced to decrease the refrigerant flow rate, thereby reducing the possibility of unevaporated refrigerant reaching the evaporator.

[0061] In one exemplary embodiment, the method further includes: performing heating compensation on the second evaporator when the temperature inside the second chamber is lower than the set temperature of the second chamber and the temperature difference between the temperature inside the second chamber and the set temperature of the second chamber is greater than a preset fourth temperature difference threshold.

[0062] In this embodiment, in addition to the first evaporator, the vehicle refrigerator also includes a second evaporator, wherein the second evaporator is used to regulate the temperature of the second compartment, and the second evaporator is located on the outlet side of the first evaporator.

[0063] In practical applications, if the temperature inside the second chamber is lower than its set temperature, and the temperature difference exceeds a preset temperature difference threshold, heating compensation is required to reduce the potential impact on the second chamber and minimize the possibility of excessively low temperatures or significant temperature fluctuations. For example, if the set temperature of the second chamber is 5°C, and the control temperature range is set to 3°C-7°C (i.e., the temperature difference threshold is 2°C), and the temperature inside the second chamber is below 3°C, heating compensation is necessary. This can be achieved by heating the second evaporator to compensate for the temperature of the second chamber.

[0064] For example, a heating element (such as a resistance heater or heating wire) installed on or near the second evaporator can be activated to release heat and offset the additional cooling effect caused by excess refrigerant, thus achieving heating compensation for the second housing. Alternatively, heat generated by other parts of the system (such as the compressor or condenser) can be transferred to the evaporator via heat pipes to balance the excessive cooling effect. Alternatively, high-temperature, high-pressure gas discharged from the compressor can be directly introduced into or near the second evaporator via a valve, utilizing the heat from this gas for heating compensation.

[0065] In this embodiment, by heating the second chamber, the temperature difference can be quickly adjusted, reducing the temperature fluctuation range and the adverse effects of excessively low temperatures. It can also reduce unnecessary energy consumption and improve energy efficiency while ensuring temperature accuracy.

[0066] In one embodiment, the method further includes: when the first compartment of the vehicle refrigerator has a cooling demand and the second compartment does not have a cooling demand, controlling the compressor to run at a preset speed, the preset speed being less than the standard starting speed.

[0067] Standard starting speed refers to the rated speed of the compressor under normal starting conditions or the initial operating speed designed for it.

[0068] In practice, when only the first chamber requires cooling, the compressor does not need to operate at full power. Furthermore, to limit refrigerant flow and ensure that the refrigerant primarily concentrates in the first evaporator, leaving the second evaporator with little or no refrigerant, the compressor can be controlled to operate at a lower speed—specifically, below its standard starting speed—when only the first chamber requires cooling. This limits refrigerant flow, allowing for more precise control of cooling capacity and reducing overcooling or temperature fluctuations. Moreover, low-speed operation reduces mechanical wear, extends compressor life, and results in lower noise levels, improving the user experience.

[0069] To more clearly illustrate the control method of the vehicle-mounted refrigerator refrigeration system provided in the embodiments of this application, the following is a detailed description of a specific embodiment and accompanying drawings. Figure 4 The specific embodiment includes the following steps:

[0070] S100 controls the compressor to run at a preset speed when the first compartment of the vehicle refrigerator has a cooling demand but the second compartment does not. The preset speed is lower than the standard starting speed.

[0071] S120, acquire the first pipe wall temperature collected by the first temperature sensor.

[0072] S140, obtain the internal temperature of the first chamber.

[0073] S160, compare the temperature of the first pipe wall with the temperature inside the first chamber.

[0074] S180, when the temperature of the first pipe wall is lower than the temperature inside the first housing, and the temperature difference between the first pipe wall temperature and the temperature inside the first housing is greater than a preset second temperature difference threshold, the compressor speed is reduced by frequency conversion drive.

[0075] Based on the same inventive concept, this application also provides a refrigeration system for a vehicle-mounted refrigerator. For example... Figure 5As shown, the refrigeration system includes: a first evaporator 510, a first temperature sensor 520, a compressor 550, and a controller (not shown in the figure). The first temperature sensor 520 is disposed on the first evaporator 510 and is used to collect the pipe wall temperature on the outlet side of the first evaporator 510. The first evaporator 510 is used to regulate the temperature of the first compartment of the vehicle refrigerator. The controller is connected to the first evaporator 510, the compressor 550, and the first temperature sensor 520 respectively.

[0076] In practical applications, the first temperature sensor 520 is installed on the outlet side of the first evaporator 510 to monitor the pipe wall temperature on the outlet side of the first evaporator 510, thereby reflecting the operating status of the first evaporator 510 and the temperature inside the chamber. The first temperature sensor 520 can be an NTC temperature sensor.

[0077] In practice, the controller can first set a corresponding temperature threshold for each compartment (e.g., refrigerator and freezer compartments) based on the target temperature set by the user. If only the first compartment has a cooling requirement and the second compartment does not, the controller controls the compressor 550 to run at a preset low speed to limit the refrigerant flow. The refrigerant mainly concentrates on evaporating in the first evaporator 510 to cool the first compartment.

[0078] During the cooling process, the first temperature sensor 520 continuously monitors the pipe wall temperature on the outlet side of the first evaporator 510 and transmits the data to the controller. The controller uses the steps described in any of the above embodiments of the control method for the vehicle refrigerator cooling system to adjust the speed of the compressor 550. This allows for more precise independent temperature control of individual compartments, even when only a single compartment has a cooling requirement, without affecting the temperature of the other compartment. The specific control process is detailed in the above embodiments of the control method for the vehicle refrigerator cooling system and will not be repeated here.

[0079] The aforementioned vehicle-mounted refrigerator's refrigeration system, by installing a first temperature sensor on the first evaporator, can monitor the pipe wall temperature at the evaporator outlet side in real time and accurately, clearly identifying the evaporator's operating status and cooling effect. When the detected first pipe wall temperature is lower than the set temperature value of the first compartment, and the temperature difference exceeds a certain temperature difference threshold, it indicates excessive cooling capacity. By automatically reducing the compressor speed, the refrigerant flow can be reduced, unnecessary energy consumption can be decreased, and the possibility of frost formation or even compressor damage due to overcooling of the first compartment can be reduced. The entire solution allows for more precise independent temperature control of individual compartments, even if only a single compartment requires cooling, without affecting the temperature status of other compartments.

[0080] like Figure 6As shown, in some other exemplary embodiments, the refrigeration system includes a second evaporator 530 connected to the outlet side of the first evaporator 510, the second evaporator 530 being used to regulate the temperature of the second compartment of the vehicle refrigerator.

[0081] In this embodiment, a dual-evaporator refrigeration system for a multi-compartment vehicle refrigerator is provided as an example. The aim is to precisely regulate the temperature of different compartments within the vehicle refrigerator by independently or collaboratively controlling the two evaporators. The first evaporator 510 and the second evaporator 530 can be connected to the compressor 550 via solenoid valves. For example, as shown... Figure 6 As shown, the solenoid valve 540 can be a one-in-two-out solenoid valve 542. The first outlet of the one-in-two-out solenoid valve 542 is connected to the first evaporator 510 and the second evaporator 530 in sequence, and the second outlet of the one-in-two-out solenoid valve 542 is connected to the inlet side of the second evaporator 530.

[0082] Specifically, the first outlet of the solenoid valve can be connected to the first evaporator 510 and the second evaporator 530 in sequence through a throttling device such as a first capillary tube (not shown in the figure), and the second outlet of the solenoid valve is connected to the port of the second evaporator 530 near the first evaporator 510 through a second capillary tube (not shown in the figure), thereby realizing flexible and precise control of the refrigerant.

[0083] If only the first compartment has a cooling requirement and the second compartment does not, the controller controls the solenoid valve 542 to open the first capillary tube, and controls the compressor 550 to run at a preset low speed to limit the refrigerant flow.

[0084] If only the second compartment requires cooling while the first compartment does not, the compressor 550 is started, and the solenoid valve is controlled to open the second capillary tube, so that the refrigerant is mainly concentrated in the first evaporator 510 for evaporation, thereby cooling the second compartment.

[0085] If both the first and second housings require cooling, the compressor 550 is started and runs at high speed. The solenoid valve is controlled to open the first capillary tube, allowing a large flow of refrigerant to flow sequentially through the first evaporator 510 and the second evaporator 530 to cool the first and second housings.

[0086] In this embodiment, the series-parallel design of the first and second evaporators is achieved by combining a one-in-two-out solenoid valve and a capillary tube, which can flexibly adapt to the refrigeration needs of single-box and multi-box units.

[0087] like Figure 7 As shown, in some other embodiments, the refrigeration system further includes a second temperature sensor 560 disposed on the first evaporator 510 for collecting the pipe wall temperature on the inlet side of the first evaporator 510.

[0088] Specifically, the second temperature sensor 560 can be located on the evaporation tube near the outlet of the solenoid valve in the first evaporator 510 (such as on the first or second evaporation tube counting backwards from the inlet of the evaporation tube) or located on the outlet side of the first evaporator 510, i.e., used to collect the tube wall temperature on the inlet side of the first evaporator 510. Similarly, the second temperature sensor can be an NTC temperature sensor.

[0089] In practice, the control module can periodically read the first pipe wall temperature and the second pipe wall temperature collected by the first temperature sensor 520 and the second temperature sensor 560, respectively, and calculate the temperature difference between them. If the first pipe wall temperature (inlet side) is equal to the second pipe wall temperature (outlet side), or the first pipe wall temperature is less than the second pipe wall temperature, but the temperature difference between them is less than a preset temperature difference threshold, such as 3°C, this indicates that the cooling capacity of the first evaporator 510 is excessive, and unevaporated refrigerant may flow through the outlet side of the first evaporator 510, or even into the second evaporator 530. Therefore, the speed of the compressor 550 can be reduced to decrease the refrigerant flow rate, thereby reducing the possibility of unevaporated refrigerant reaching the evaporator.

[0090] like Figure 8 As shown, in one embodiment, the refrigeration system further includes a heating component 570 for heating compensation of the second evaporator 530.

[0091] In this embodiment, the heating element includes, but is not limited to, a resistance heater or a heating wire.

[0092] Since the second chamber does not require refrigeration, to minimize potential impact on it, under certain conditions—for example, if the first chamber has a strong cooling effect, the high compressor speed of 550 rpm may cause more refrigerant to flow into the second evaporator, resulting in excessively low or fluctuating temperatures in the second chamber. For instance, if the set temperature of the second chamber is 5°C and the control temperature range is set to 3°C-7°C (i.e., a temperature difference threshold of 2°C), and the internal temperature of the second chamber is below 3°C, then heating compensation is required. In this case, heating compensation for the second chamber can be achieved by activating a heating wire installed on or near the second evaporator to release heat and counteract the additional cooling effect caused by excess refrigerant.

[0093] In other embodiments, the refrigeration system further includes a liquid receiver, through which the second evaporator 530 is connected to the compressor 550.

[0094] In this embodiment, the primary function of the receiver is to store the high-pressure liquid refrigerant flowing from the condenser, preventing excess liquid refrigerant from occupying the condenser's space. Furthermore, the receiver can act as a buffer for the liquid refrigerant in the refrigeration system, adjusting and stabilizing the refrigerant circulation rate according to system demand. When the system needs more refrigerant, the receiver can release the stored refrigerant; when refrigeration demand decreases, it can store excess refrigerant. During the refrigerant's return from the evaporator to the compressor, the receiver prevents any incompletely vaporized liquid refrigerant from directly entering the compressor, avoiding damage. Additionally, the receiver can also act as a liquid seal, preventing high-pressure refrigerant gas from entering low-pressure system pipelines, and also helps isolate the pressure in different parts of the system.

[0095] In this embodiment, by introducing a liquid receiver, not only is the efficiency and reliability of the vehicle refrigerator refrigeration system improved, but the system's flexibility is also enhanced.

[0096] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0097] Based on the same inventive concept, this application also provides a control device for a vehicle refrigerator refrigeration system for implementing the control method of the vehicle refrigerator refrigeration system described above. The solution provided by this device is similar to the solution described in the above method. Therefore, the specific limitations of one or more vehicle refrigerator refrigeration system control device embodiments provided below can be found in the limitations of the vehicle refrigerator refrigeration system control method described above, and will not be repeated here.

[0098] In one exemplary embodiment, such as Figure 9As shown, a control device 900 for a vehicle-mounted refrigerator refrigeration system is provided. The refrigeration system includes: a first temperature sensor disposed on a first evaporator for collecting the pipe wall temperature at the outlet side of the first evaporator; the first evaporator for regulating the temperature of the first compartment of the vehicle-mounted refrigerator; and a controller connected to the first evaporator, a compressor, and the first temperature sensor. The device includes: a data acquisition module 910, a data comparison module 920, and a control module 930, wherein:

[0099] The data acquisition module 910 is used to acquire the first pipe wall temperature collected by the first temperature sensor when the first compartment of the vehicle refrigerator has a cooling demand and the second compartment does not have a cooling demand.

[0100] The data comparison module 920 is used to compare the first pipe wall temperature with the temperature set value of the first chamber.

[0101] The control module 930 is used to reduce the speed of the compressor of the vehicle refrigerator when the first pipe wall temperature is lower than the preset temperature setting value of the first chamber and the temperature difference between the first pipe wall temperature and the temperature setting value is greater than the preset first temperature difference threshold.

[0102] In one embodiment, the data acquisition module 910 is further configured to acquire the internal temperature of the first housing; the data comparison module 920 is further configured to compare the first pipe wall temperature with the internal temperature of the first housing; and the control module 930 is further configured to reduce the compressor speed when the first pipe wall temperature is lower than the internal temperature of the first housing and the temperature difference between the first pipe wall temperature and the internal temperature of the first housing is greater than a preset second temperature difference threshold.

[0103] Among them, the speed drop is greater than the temperature difference between the first pipe wall temperature and the first housing temperature setpoint, which is greater than the preset first temperature difference threshold, and the preset second temperature difference threshold is greater than the preset first temperature difference threshold.

[0104] In one embodiment, the data acquisition module 910 is further configured to acquire the first pipe wall temperature collected by the first temperature sensor and the second pipe wall temperature collected by the second temperature sensor, wherein the first temperature sensor is disposed in the first evaporator and is used to collect the pipe wall temperature on the inlet side of the first evaporator.

[0105] The control module 930 is also used to reduce the compressor speed when the first pipe wall temperature is equal to the second pipe wall temperature. Alternatively, it can reduce the compressor speed when the first pipe wall temperature is less than the second pipe wall temperature and the temperature difference between the first and second pipe wall temperatures is less than a preset third temperature difference threshold.

[0106] Among them, the third temperature difference threshold is less than the first temperature difference threshold.

[0107] In one embodiment, the refrigeration system further includes a second evaporator connected to the outlet side of the first evaporator, the second evaporator being used to regulate the temperature of the second chamber. The control module 930 is also configured to perform heating compensation on the second evaporator when the temperature inside the second chamber is lower than the set temperature of the second chamber, and the temperature difference between the temperature inside the second chamber and the set temperature of the second chamber is greater than a preset fourth temperature difference threshold.

[0108] In one embodiment, the control module 930 is further configured to control the compressor to run at a preset speed when the first compartment of the vehicle refrigerator has a cooling demand and the second compartment does not have a cooling demand. The preset speed is less than the standard starting speed.

[0109] The various modules in the control device of the aforementioned vehicle-mounted refrigerator refrigeration system can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of a computer device in hardware form or independent of it, or stored in the memory of a computer device in software form, so that the processor can call and execute the corresponding operations of each module.

[0110] In one exemplary embodiment, a vehicle-mounted refrigerator is provided, which includes a refrigerator body and the refrigeration system described in any of the above embodiments of the vehicle-mounted refrigerator refrigeration system.

[0111] In one exemplary embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as follows: Figure 10 As shown, the computer device includes a processor, memory, input / output (I / O) interfaces, and a communication interface. The processor, memory, and I / O interfaces are connected via a system bus, and the communication interface is also connected to the system bus via the I / O interfaces. The processor provides computational and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and a database. The internal memory provides the environment for the operating system and computer programs stored in the non-volatile storage media. The database stores data such as temperature difference thresholds and cabinet temperature setpoints. The I / O interfaces are used for information exchange between the processor and external devices. The communication interface is used for communication with an external vehicle refrigerator via a network connection. When the computer program is executed by the processor, it implements a control method for a vehicle refrigerator refrigeration system.

[0112] Those skilled in the art will understand that Figure 10The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0113] In one exemplary embodiment, a computer device is provided, including a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the steps in any of the above embodiments of the control method for a vehicle-mounted refrigerator refrigeration system.

[0114] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which, when executed by a processor, implements the steps in any of the above embodiments of the control method for the vehicle-mounted refrigerator refrigeration system.

[0115] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, implements the steps in any of the above embodiments of the control method for a vehicle-mounted refrigerator refrigeration system.

[0116] It should be noted that the data involved in this application (including but not limited to data used for analysis, data stored, data displayed, etc.) are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of the relevant data must comply with relevant regulations.

[0117] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, artificial intelligence (AI) processors, etc., and are not limited to these.

[0118] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0119] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A control method for a vehicle-mounted refrigerator refrigeration system, characterized in that, The vehicle-mounted refrigerator includes a first compartment and a second compartment. The refrigeration system of the vehicle-mounted refrigerator includes a first evaporator, a compressor, and a first temperature sensor. The first temperature sensor is disposed on the first evaporator and is used to collect the pipe wall temperature on the outlet side of the first evaporator. The first evaporator is used to regulate the temperature of the first compartment. The method includes: When the first chamber has a cooling requirement and the second chamber does not have a cooling requirement, the first pipe wall temperature collected by the first temperature sensor is obtained. Compare the temperature of the first pipe wall with the temperature set value of the first chamber. When the temperature of the first pipe wall is lower than the temperature setting value of the first housing, and the temperature difference between the first pipe wall temperature and the temperature setting value is greater than a preset first temperature difference threshold, the speed of the compressor is reduced.

2. The method according to claim 1, characterized in that, The method further includes: Obtain the internal temperature of the first enclosure; Compare the temperature of the first pipe wall with the temperature inside the first chamber. When the temperature of the first pipe wall is lower than the temperature inside the first housing, and the temperature difference between the first pipe wall temperature and the temperature inside the first housing is greater than a preset second temperature difference threshold, the speed of the compressor is reduced, wherein the preset second temperature difference threshold is greater than a preset first temperature difference threshold.

3. The method according to claim 1 or 2, characterized in that, The refrigeration system further includes a second evaporator connected to the outlet side of the first evaporator, the second evaporator being used to regulate the temperature of the second housing; the method further includes: When the temperature inside the second chamber is lower than the set temperature of the second chamber, and the temperature difference between the temperature inside the second chamber and the set temperature of the second chamber is greater than the preset fourth temperature difference threshold, the second evaporator is heated to compensate.

4. The method according to claim 1 or 2, characterized in that, The vehicle-mounted refrigerator refrigeration system further includes a second temperature sensor, which is disposed in the first evaporator and used to collect the pipe wall temperature on the inlet side of the first evaporator; the method further includes: Obtain the second pipe wall temperature collected by the second temperature sensor; When the first pipe wall temperature is equal to the second pipe wall temperature, reduce the speed of the compressor; Alternatively, if the temperature of the first pipe wall is lower than the temperature of the second pipe wall, and the temperature difference between the first pipe wall and the second pipe wall is lower than a preset third temperature difference threshold, the speed of the compressor may be reduced.

5. The method according to claim 1 or 2, characterized in that, The method further includes: When the first chamber has a cooling requirement and the second chamber does not, the compressor is controlled to run at a preset speed, which is less than the standard starting speed.

6. A refrigeration system for a vehicle-mounted refrigerator, characterized in that, The refrigeration system includes: a first evaporator, a first temperature sensor, a compressor, and a controller. The first temperature sensor is disposed on the first evaporator and is used to collect the pipe wall temperature on the outlet side of the first evaporator. The first evaporator is used to regulate the temperature of the first compartment of the vehicle refrigerator. The controller is connected to the first evaporator, the compressor, and the first temperature sensor respectively. The controller is used to execute the control method of the vehicle refrigerator refrigeration system as described in any one of claims 1, 2 or 5 above.

7. The refrigeration system according to claim 6, characterized in that, The refrigeration system further includes: a second evaporator connected to the outlet side of the first evaporator, the second evaporator being used to regulate the temperature of the second compartment of the vehicle refrigerator; The controller is also used to execute the control method of the vehicle refrigerator refrigeration system according to claim 3.

8. The refrigeration system according to claim 7, characterized in that, The refrigeration system also includes a heating component connected to the controller, which is used to provide heating compensation for the second evaporator.

9. The refrigeration system according to claim 7, characterized in that, The system also includes a solenoid valve, the outlet of which is connected in sequence to the first evaporator and the second evaporator.

10. The refrigeration system according to claim 9, characterized in that, The solenoid valve includes a one-inlet, two-outlet solenoid valve. The first outlet of the one-inlet, two-outlet solenoid valve is connected to the first evaporator and the second evaporator in sequence, and the second outlet of the solenoid valve is connected to the inlet side of the second evaporator.

11. The refrigeration system according to claim 10, characterized in that, The refrigeration system also includes a second temperature sensor disposed on the first evaporator, the second temperature sensor being used to collect the pipe wall temperature on the inlet side of the first evaporator; The controller is also used to execute the control method of the vehicle refrigerator refrigeration system as described in claim 4.

12. A vehicle-mounted refrigerator, characterized in that, The vehicle-mounted refrigerator includes the vehicle-mounted refrigerator refrigeration system as described in any one of claims 6 to 11.

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