Control method and system for vehicle-mounted refrigerator

Abstract

The invention discloses a control method and system of a vehicle-mounted refrigerator, and relates to the technical field of refrigeration equipment control. The method comprises the steps that it is determined that the vehicle-mounted refrigerator is in a power-on state, and the target temperature and the environment temperature corresponding to the vehicle-mounted refrigerator are obtained; when the target temperature is larger than the preset temperature and the environment temperature is larger than the preset environment temperature, a stepping damping air door is opened; calculating the target temperature and a preset temperature to obtain a temperature deviation; judging whether the temperature deviation is greater than a preset threshold; when the temperature deviation is larger than a preset threshold value, the first opening degree is determined according to the temperature deviation; an adjusting instruction is generated based on the first opening degree, the stepping type damping air door is controlled to be adjusted to the first opening degree from the second opening degree according to the adjusting instruction so that the stepping type damping air door can control the cooling capacity of the vehicle-mounted refrigerator according to the first opening degree, and the second opening degree is the initial opening degree of the stepping type damping air door. By implementing the technical scheme provided by the invention, the problems caused by an electromagnetic valve driving switch type control mode are solved.

Description

Technical Field

[0001] This application relates to the technical field of refrigeration equipment control, and particularly to a control method and system for a vehicle-mounted refrigerator. Background Art

[0002] With the continuous improvement of the quality of life, the frequency of people participating in long-distance self-driving tours or travels during their leisure time is increasing day by day. During long-distance travels, vehicle-mounted refrigerators have become an important part of travel equipment due to their characteristics of keeping food and beverages fresh and at a low temperature, as well as their function of providing suitable storage conditions for other special items that need to be refrigerated and ensuring their quality and safety.

[0003] In terms of the working principle, a vehicle-mounted refrigerator realizes refrigeration based on the vapor compression refrigeration cycle. Specifically, the refrigerant is compressed by a compressor, causing its pressure and temperature to rise; subsequently, the high-temperature and high-pressure refrigerant enters the condenser, where it releases heat and liquefies; the liquid refrigerant enters the evaporator after being depressurized by a throttling device and absorbs heat and vaporizes in the evaporator, thereby achieving the refrigeration effect and completing the entire refrigeration cycle. Given that a vehicle-mounted refrigerator usually has a refrigerating compartment and a freezing compartment, in order to reasonably distribute the refrigerant to achieve effective refrigeration in the two temperature zones, a solenoid valve drive method can be used to control the flow direction of the refrigerant. The solenoid valve can switch different refrigeration circuits, enabling the refrigerant to flow to the evaporator corresponding to the refrigerating compartment or the freezing compartment. However, the solenoid valve drive only has two states: fully open and fully closed. This on-off control method is difficult to perform fine cold quantity distribution according to the different temperature requirements of the refrigerating compartment and the freezing compartment. Since the distribution ratio of the refrigerant between the two temperature zones cannot be accurately adjusted, it may lead to excessive refrigeration in one temperature zone and insufficient refrigeration in the other temperature zone, thereby affecting the overall refrigeration effect.

[0004] Therefore, there is an urgent need for a control method and system for a vehicle-mounted refrigerator that can solve the above technical problems. Summary of the Invention

[0005] This application provides a control method and system for a vehicle-mounted refrigerator. This method effectively solves the problems brought by the on-off control method of the solenoid valve drive and improves the refrigeration effect of the vehicle-mounted refrigerator.

[0006] In a first aspect, the present application provides a control method for a vehicle-mounted refrigerator. The method includes: determining that the vehicle-mounted refrigerator is in a powered-on state, obtaining a target temperature and an ambient temperature corresponding to the vehicle-mounted refrigerator, where the target temperature includes a refrigeration temperature and a freezing temperature; determining whether the target temperature is greater than a preset temperature and whether the ambient temperature is greater than a preset ambient temperature, where the preset temperature includes a preset refrigeration temperature and a preset first freezing temperature; when the target temperature is greater than the preset temperature and the ambient temperature is greater than the preset ambient temperature, turning on a stepping damping air door; calculating a temperature deviation by comparing the target temperature with the preset temperature, where the temperature deviation includes a refrigeration temperature deviation and a freezing temperature deviation; determining whether the temperature deviation is greater than a preset threshold, where the preset threshold includes a preset refrigeration threshold and a preset freezing threshold; when the temperature deviation is greater than the preset threshold, determining a first opening degree according to the temperature deviation; generating an adjustment instruction based on the first opening degree, and controlling the stepping damping air door to adjust from a second opening degree to the first opening degree according to the adjustment instruction, so that the stepping damping air door controls the cooling capacity of the vehicle-mounted refrigerator according to the first opening degree, and the second opening degree is the initial opening degree of the stepping damping air door.

[0007] By adopting the above technical solution, the target temperature and the ambient temperature are obtained separately. When the target temperature is greater than the preset temperature and the ambient temperature is greater than the preset ambient temperature, it is determined to turn on the stepping damping air door. Since the target temperature includes the refrigeration temperature and the freezing temperature, and the solenoid valve control method often regards the refrigerating chamber and the freezing chamber as a whole for adjustment and cannot sense the independent temperature changes of the two temperature zones. Through the independent monitoring of the temperatures of the two temperature zones, the actual temperature states of each temperature zone can be accurately understood. The obtained target temperature is compared with the corresponding preset temperature respectively to calculate the temperature deviation, and the temperature deviation is compared with the preset threshold. When the temperature deviation is greater than the preset threshold, the first opening degree of the stepping damping air door is determined according to the temperature deviation, and the adjustment range of the opening degree of the stepping damping air door is determined according to the first opening degree. The stepping damping air door can dynamically adjust the opening degree of the air door according to the real-time monitored temperature deviation, so as to dynamically adjust the distribution ratio of the refrigerant between the refrigerating chamber and the freezing chamber. This dynamic adjustment mechanism can keep the temperature in the vehicle-mounted refrigerator within a relatively stable range all the time, improving the refrigeration effect and energy utilization efficiency, so as to solve the problem that the solenoid valve on-off control cannot achieve dynamic cooling capacity distribution.

[0008] Optionally, after obtaining the target temperature and the ambient temperature corresponding to the in-vehicle refrigerator, where the target temperature includes the refrigeration temperature and the freezing temperature, the method further includes: obtaining the target current corresponding to the target sensor, where the target sensor includes a first sensor, a second sensor, and a third sensor, and the target current includes a refrigeration current, a freezing current, and an ambient current. The refrigeration current is the current corresponding to the first sensor installed in the refrigerating chamber, the freezing current is the current corresponding to the second sensor installed in the freezing chamber, and the ambient current is the current corresponding to the third sensor installed outside the in-vehicle refrigerator; determining whether the target current is within a preset current range, where the preset current range includes a refrigeration current range, a freezing current range, and an ambient current range; when the target current is within the preset current range, determining whether the target temperature is greater than a preset temperature and whether the ambient temperature is greater than a preset ambient temperature.

[0009] By adopting the above technical solution, the refrigeration current, the freezing current, and the ambient current corresponding to the first sensor, the second sensor, and the third sensor are obtained and compared with the preset refrigeration current range, the freezing current range, and the ambient current range. When the sensor is working properly, the corresponding current should be within the preset current range. Only when the target current is within the preset current range, the judgment of the target temperature and the preset temperature and the ambient temperature and the preset ambient temperature is continued. Because when the current of the target sensor is abnormal, the monitored temperature data is unreliable. First, the current of the target sensor is calibrated to filter out effective temperature data, avoiding incorrect temperature judgment caused by sensor failure and improving the accuracy and reliability of the subsequent temperature control strategy.

[0010] Optionally, after determining whether the target current is within the preset current range, the method further includes: when the target current is not within the preset current range, determining that the target sensor is in a fault state; determining a preset protection mode according to the fault state, where the preset protection mode includes a first processing method, a second processing method, and a third processing method. The first sensor corresponds to the first processing method, the second sensor corresponds to the second processing method, and the third sensor corresponds to the third processing method. The first processing method is to perform a first opening control and a first closing control on the step-type damping air door according to a first period, where the first period includes a first duration of the first opening control and a second duration corresponding to the first closing control; the second processing method is to perform a second opening control and a second closing control on the compressor according to a second period, where the second period includes a third duration of the second opening control and a fourth duration of the second closing control; the third processing method is to determine that the third sensor is set to a fixed ambient temperature.

[0011] By adopting the above technical solutions, when the target current is not within the preset current range, it is determined that the target sensor is in a faulty state, and corresponding preset protection modes are generated for different sensor faults. The preset protection modes provide a temporary operation plan for the vehicle-mounted refrigerator in case of sensor faults. When the first sensor fails, the first processing method is adopted, that is, the step-type damping air door is periodically opened and closed according to the first cycle. Through this periodic control, the cold quantity can be ensured to continue flowing between the refrigerating chamber and the freezing chamber to a certain extent, maintaining the basic refrigeration function of the vehicle-mounted refrigerator. When the second sensor fails, the second processing method is adopted, and the compressor is turned on and off according to the second cycle. By reasonably controlling its operation cycle, it is possible to prevent the compressor from over-running in the case where the sensor fault causes the temperature of the freezing chamber to be unable to be accurately judged, thereby avoiding damage to the compressor due to long-term high-load operation. When the third sensor fails, the third processing method is adopted, and the third sensor is set to a fixed ambient temperature, providing a relatively stable ambient temperature reference value to avoid misjudgment of the external temperature due to sensor faults, thereby affecting the entire refrigeration control strategy.

[0012] Optionally, after when the target current is within the preset current range, the method further includes: judging whether the freezing temperature is greater than a preset second freezing temperature; when the freezing temperature is greater than the preset second freezing temperature, determining to start the compressor; when the freezing temperature is less than the preset second freezing temperature, determining to turn off the compressor.

[0013] By adopting the above technical solutions, the freezing temperature is compared with the preset second freezing temperature in real time. When the freezing temperature is greater than the preset second freezing temperature, it indicates that the current temperature of the freezing chamber has not reached the ideal low temperature state. At this time, the compressor is started for refrigeration. The compressor is the core component of the refrigeration system. It compresses the refrigerant, making it circulate in the system, absorbing the heat in the freezing chamber and discharging it to the outside, thereby reducing the temperature of the freezing chamber. When the freezing temperature is less than the preset second freezing temperature, it means that the temperature of the freezing chamber is already lower than the ideal temperature. At this time, the compressor is turned off to stop the refrigeration process, which can prevent the temperature of the freezing chamber from being too low, avoid energy waste caused by over-refrigeration, and at the same time protect the items in the freezing chamber, preventing the items from being frozen or damaged due to too low temperature.

[0014] Optionally, after obtaining the target temperature and the ambient temperature corresponding to the in-vehicle refrigerator, where the target temperature includes the refrigeration temperature and the freezing temperature, the method further includes: obtaining a first operation duration, where the first operation duration is the total duration of cumulative operation of the compressor; determining whether the first operation duration is greater than or equal to a preset first operation duration; when the first operation duration is greater than or equal to the preset first operation duration, obtaining a first temperature monitored by a fourth sensor, where the fourth sensor is a sensor installed inside the in-vehicle refrigerator; determining whether the first temperature is less than or equal to a preset first defrosting temperature; when the first temperature is less than or equal to the preset first defrosting temperature, determining to start a heater so that the heater performs a defrosting operation on the in-vehicle refrigerator.

[0015] By adopting the above technical solution, after the compressor accumulatively operates for a preset operation duration, frost is likely to form on the surface of the evaporator. The accumulation of the frost layer will hinder the heat exchange between the refrigerant and the evaporator and reduce the refrigeration efficiency. By obtaining the first operation duration of the compressor and further determining the first temperature inside the in-vehicle refrigerator when the first operation duration is greater than or equal to the preset first operation duration, when the first temperature is less than or equal to the preset first defrosting temperature, the heater is started for defrosting. If the heater is started for defrosting only based on the operation duration of the compressor without considering the actual temperature inside the refrigerator, it may cause the heater to operate when defrosting is not required, resulting in energy waste. After determining that the operation duration of the compressor reaches the preset value, it is also necessary to determine whether the temperature inside the refrigerator is less than or equal to the preset first defrosting temperature. Only when both conditions are met is the heater started, avoiding unnecessary defrosting operations.

[0016] Optionally, after determining to start a heater so that the heater performs a defrosting operation on the in-vehicle refrigerator when the first temperature is less than or equal to the preset first defrosting temperature, the method further includes: at an interval of a preset time, obtaining a second temperature and a second operation duration, where the second operation duration is the total duration of heating by the heater, and the second temperature is the temperature corresponding to the fourth sensor; determining whether the second temperature is greater than a preset second defrosting temperature, or whether the second operation duration is greater than or equal to a preset second operation duration; when the second temperature is greater than the preset second defrosting temperature, or the second operation duration is greater than or equal to the preset second operation duration, determining to turn off the heater and prohibiting the compressor or the step damper from being turned on within a preset duration.

[0017] By adopting the above technical solution, when the heater performs a defrosting operation, the second temperature corresponding to the fourth sensor and the second operating duration of the heater are obtained at preset time intervals. It is determined whether to turn off the heater by judging whether the second temperature is greater than the preset second defrosting temperature or whether the second operating duration is greater than or equal to the preset duration. If the second temperature reaches the preset second defrosting temperature, it indicates that the frost layer has basically melted and the defrosting purpose has been achieved; if the second operating duration reaches the preset duration, even if the temperature has not fully reached, the potential safety hazards that may be brought about by the long-term operation of the heater can be avoided. At this time, turning off the heater can ensure that the defrosting operation ends effectively and safely. Since the heater raises the internal temperature of the refrigerator during the defrosting process, if the compressor or the step damper is immediately turned on for refrigeration at this time, it will cause a sudden increase in the load of the refrigeration system, affecting the refrigeration effect and system stability. By setting a period during which it is prohibited to turn on, that is, the compressor or the step damper is prohibited from being turned on within the preset duration, the refrigeration system can operate under more stable working conditions, improving the refrigeration efficiency, reducing the energy consumption, and at the same time reducing the probability of component wear and failure caused by sudden changes in the system load. Optionally, after determining to start the heater when the first temperature is less than or equal to the preset first defrosting temperature so that the heater defrosts the vehicle-mounted refrigerator, the method further includes: determining that the vehicle-mounted refrigerator is in a defrosting operation, generating a closing instruction according to the defrosting operation, so as to close the step damper according to the closing instruction.

[0018] By adopting the above technical solution, during the defrosting operation, the heater works to raise the internal temperature of the vehicle-mounted refrigerator to melt the frost layer. If the step damper is in an open state, it will cause the internal heat of the refrigerator to exchange with the outside air through the damper, resulting in heat loss. Generating a closing instruction according to the defrosting operation and closing the step damper can effectively reduce heat loss, making the heat generated by the heater more concentratedly used for defrosting. Moreover, after closing the step damper, a relatively closed space is formed inside the vehicle-mounted refrigerator, and the heat generated by the heater can circulate and distribute more effectively in this space, enabling each part of the frost layer to be evenly heated, thereby melting the frost layer more thoroughly.

[0019] In a second aspect of the present application, a control system for a vehicle-mounted refrigerator is provided. The system includes an acquisition unit, a processing unit, and an adjustment unit. The acquisition unit determines that the vehicle-mounted refrigerator is in a powered-on state, and acquires the target temperature and the ambient temperature corresponding to the vehicle-mounted refrigerator. The target temperature includes a refrigeration temperature and a freezing temperature. The processing unit determines whether the target temperature is greater than a preset temperature and whether the ambient temperature is greater than a preset ambient temperature. The preset temperature includes a preset refrigeration temperature and a preset first freezing temperature. When the target temperature is greater than the preset temperature and the ambient temperature is greater than the preset ambient temperature, the step-type damping air door is opened. The target temperature is calculated with the preset temperature to obtain a temperature deviation, where the temperature deviation includes a refrigeration temperature deviation and a freezing temperature deviation. It is determined whether the temperature deviation is greater than a preset threshold, where the preset threshold includes a preset refrigeration threshold and a preset freezing threshold. When the temperature deviation is greater than the preset threshold, a first opening degree is determined according to the temperature deviation. The adjustment unit generates an adjustment instruction based on the first opening degree, and controls the step-type damping air door to adjust from a second opening degree to the first opening degree according to the adjustment instruction, so that the step-type damping air door controls the cooling capacity of the vehicle-mounted refrigerator according to the first opening degree, and the second opening degree is the initial opening degree of the step-type damping air door.

[0020] In a third aspect of the present application, an electronic device is provided. The electronic device includes a processor, a memory, a user interface, and a network interface. The memory is used to store instructions. The user interface and the network interface are used to communicate with other devices. The processor is used to execute the instructions stored in the memory, so that the electronic device executes the method of any one of the above in the present application.

[0021] In a fourth aspect of the present application, a computer-readable storage medium is provided. The computer-readable storage medium stores instructions, and when the instructions are executed, the method of any one of the above in the present application is executed.

[0022] In summary, one or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages: 1. First, obtain the target temperature and the ambient temperature respectively. When the target temperature is greater than the preset temperature and the ambient temperature is greater than the preset ambient temperature, it is determined to turn on the step - type damping air damper. Since the target temperature includes the refrigerating temperature and the freezing temperature, and the solenoid valve control method often regards the refrigerating chamber and the freezing chamber as a whole for adjustment and cannot sense the independent temperature changes of the two temperature zones. By independently monitoring the temperatures of the two temperature zones, the actual temperature status of each temperature zone can be accurately understood. Compare the obtained target temperatures with the corresponding preset temperatures respectively, calculate the temperature deviation, compare the temperature deviation with the preset threshold. When the temperature deviation is greater than the preset threshold, determine the first opening degree of the step - type damping air damper according to the temperature deviation, and determine the adjustment amplitude of the opening degree of the step - type damping air damper according to the first opening degree. The step - type damping air damper can dynamically adjust the opening degree of the air damper according to the real - time monitored temperature deviation, thereby dynamically adjusting the distribution ratio of the refrigerant between the refrigerating chamber and the freezing chamber. This dynamic adjustment mechanism can keep the temperature inside the vehicle refrigerator within a relatively stable range all the time, improving the refrigeration effect and energy utilization efficiency to solve the problem that the solenoid valve on - off control cannot achieve dynamic cold quantity distribution.

[0023] 2. Obtain the refrigerating current, freezing current, and ambient current corresponding to the first sensor, the second sensor, and the third sensor, and compare them with the preset refrigerating current range, freezing current range, and ambient current range. When the sensor is working normally, the corresponding current should be within the preset current range. Only when the target current is within the preset current range, continue to judge the target temperature and the preset temperature, as well as the ambient temperature and the preset ambient temperature. Because when the target sensor current is abnormal, the monitored temperature data is unreliable. First, check the target sensor current to screen out the effective temperature data, avoiding incorrect temperature judgment caused by sensor failure and improving the accuracy and reliability of the subsequent temperature control strategy. Description of the Drawings

[0024] Figure 1 is the first flow chart of a control method for a vehicle refrigerator provided by an embodiment of the present application; Figure 2 is the first structural diagram of a control method for a vehicle refrigerator provided by an embodiment of the present application; Figure 3 is the second structural diagram of a control method for a vehicle refrigerator provided by an embodiment of the present application; Figure 4 is the second flow chart of a control method for a vehicle refrigerator provided by an embodiment of the present application; Figure 5 is the third flow chart of a control method for a vehicle refrigerator provided by an embodiment of the present application; Figure 6It is a schematic structural diagram of a control system of a vehicle-mounted refrigerator provided by an embodiment of the present application; Figure 7 It is a schematic structural diagram of an electronic device disclosed by an embodiment of the present application.

[0025] Explanation of reference numerals: 601, acquisition unit; 602, processing unit; 603, adjustment unit; 700, electronic device; 701, processor; 702, memory; 703, user interface; 704, network interface; 705, communication bus. Detailed implementation manners

[0026] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments.

[0027] In the description of the embodiments of the present application, words such as "for example" or "for illustration" are used to represent examples, illustrations or explanations. Any embodiment or design solution described as "for example" or "for illustration" in the embodiments of the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Exactly speaking, using words such as "for example" or "for illustration" aims to present relevant concepts in a specific manner.

[0028] In the description of the embodiments of the present application, the meaning of the term "a plurality of" refers to two or more. For example, a plurality of systems refers to two or more systems, and a plurality of screen terminals refers to two or more screen terminals. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the technical features indicated. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. The terms "include", "comprise", "have" and their variants all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0029] The birth of vehicle-mounted refrigerators has brought great convenience to people's lives. When refrigerating the interior of a vehicle-mounted refrigerator through a compressor and a refrigerant, the vehicle-mounted refrigerator usually has a refrigerating chamber and a freezing chamber. Currently, the solenoid valve control method is used to control the flow direction of the refrigerant. However, the solenoid valve control method often regards the refrigerating chamber and the freezing chamber as a whole for adjustment, and cannot sense the independent temperature changes of the two temperature zones, resulting in the inability to perform fine cold quantity distribution according to the temperature requirements of the two temperature zones, thereby affecting the overall refrigeration effect. Therefore, how to solve the problems brought by the solenoid valve drive switch control method. A control method for a vehicle-mounted refrigerator provided by an embodiment of the present application is applied to a power board. Figure 1It is the first process schematic diagram of a control method for a vehicle-mounted refrigerator provided by an embodiment of the present application. Reference Figure 1 , and this method includes the following steps S101 - step S107.

[0030] S101: Determine that the vehicle-mounted refrigerator is in a powered-on state, and obtain the target temperature and ambient temperature corresponding to the vehicle-mounted refrigerator. The target temperature includes the refrigeration temperature and the freezing temperature.

[0031] In the above S101, the vehicle-mounted refrigerator is usually equipped with a power detection module, and the power detection module will monitor the power connection status of the vehicle-mounted refrigerator in real time. When the vehicle-mounted refrigerator is normally connected to an external power source (such as a vehicle power source, a DC 12V power source, etc.), and the power monitoring module receives a stable voltage signal, it will determine that the vehicle-mounted refrigerator is in a powered-on state. For example, in a vehicle environment, when the vehicle starts and the vehicle voltage supplies power to the vehicle-mounted refrigerator, and the power detection module detects that the voltage is within the normal operating range (such as 12V), it will send a power-on signal to the power board of the vehicle-mounted refrigerator, indicating that the vehicle-mounted refrigerator is powered on. At this time, the power board refers to the main control system of the vehicle-mounted refrigerator.

[0032] In addition, since the hardware of the vehicle-mounted refrigerator consists of multiple modules, such as Figure 2The hardware block diagram shown includes a power supply board, a display board, a power detection module, a refrigerator door heating module, a compressor module, a damper heating module, a damper stepper motor module, a fan module, a door switch module, a lighting module, a defrost sensor, a freezing sensor, a lower refrigerating chamber sensor, an upper refrigerating chamber sensor, and an ambient temperature sensor. Among them, the display board communicates with the power supply board and can be connected using a UART communication line; the refrigerator door heating module, the damper heating module, the door switch module, and the lighting module are all connected to the power supply board. The power supply board outputs commands to these modules so that these modules perform corresponding operations according to the output commands; the defrost sensor, the freezing sensor, the lower refrigerating chamber sensor, the upper refrigerating chamber sensor, and the ambient temperature sensor are all connected to the power supply board and input detection data to the power supply board for processing; the compressor module, the damper stepper motor module, and the fan module are all interconnected with the power supply board, can receive the output commands of the power supply board for control, and can also input detection data to the power supply board. The voltage operating range of the power detection module is a wide voltage input of 8.5V - 32V. The power supply board detects conditions such as temperature, door status, and power supply voltage to control the operation of the compressor, the step damper, the fan, and the lighting, so as to control the temperatures of the refrigerating chamber and the freezing chamber within a certain range to preserve food. The defrost sensor refers to the sensor installed in the area where frost is likely to form inside the vehicle-mounted refrigerator. The upper refrigerating chamber sensor and the lower refrigerating chamber sensor refer to the sensors installed in the refrigerating chamber of the vehicle-mounted refrigerator. The freezing sensor refers to the sensor installed in the freezing chamber of the vehicle-mounted refrigerator. The ambient temperature sensor refers to the sensor installed outside the vehicle-mounted refrigerator. The damper heating module refers to the step damper driven by a stepper motor, and the damper stepper motor module refers to the stepper motor drive. The opening and closing of the door of the vehicle-mounted refrigerator can be detected through the door switch module. Once it is confirmed that the door of the vehicle-mounted refrigerator is open for a long time or not properly closed, the buzzer is triggered for warning.

[0033] Furthermore, after temperature sensors have been set inside and outside the vehicle-mounted refrigerator in advance, the temperature sensors at this time refer to Figure 2The freezing sensor, lower refrigerating sensor, upper refrigerating sensor, and ambient temperature sensor mentioned in . The temperature signals of the refrigerating temperature, freezing temperature, and ambient temperature are collected in real time through the temperature sensor. Since the detection period is set relatively frequently, such as once per second. To ensure the effectiveness of the sampled temperature, the temperature signals can be collected multiple times in real time. To remove the jitter interference during the sampling process, the median filtering algorithm is used. After continuously sampling 5 times, the middle value is taken as the effective temperature value. Taking the temperature collection of the freezer as an example, after continuously sampling 5 times the multiple sub-freezing temperatures corresponding to the freezer, the multiple sub-freezing temperatures are then sent to the power board. So that after the power board receives the multiple sub-freezing temperatures, the middle value is selected from the multiple sub-freezing temperatures as the freezing temperature. Referring to the above method of collecting the temperature of the freezer to obtain the ambient temperature and freezing temperature, at this time, the freezing temperature, refrigerating temperature, and ambient temperature are all obtained through the median filtering algorithm processing. After the power board obtains the target temperature and ambient temperature, the target temperature includes the refrigerating temperature and the freezing temperature at this time.

[0034] For example, the temperature of the refrigerating chamber is collected in real time. The refrigerating sub-temperatures obtained by continuously sampling 5 times are 2°C, 3°C, 5°C, 6°C, and 9°C. The middle value 5°C is selected as the refrigerating temperature for output.

[0035] In a possible implementation manner, when using the temperature sensor to collect the temperature of the in-vehicle refrigerator, it is also necessary to perform a fault detection on the temperature sensor. By monitoring the current of the temperature sensor in real time to ensure that the temperature sensor can normally perform temperature monitoring, specifically including: obtaining the target current corresponding to the target sensor. The target sensor includes the first sensor, the second sensor, and the third sensor. The target current includes the refrigerating current, the freezing current, and the ambient current. The refrigerating current is the current corresponding to the first sensor installed in the refrigerating chamber. The freezing current is the current corresponding to the second sensor installed in the freezer. The ambient current is the current corresponding to the third sensor installed outside the in-vehicle refrigerator; determining whether the target current is within the preset current range. The preset current range includes the refrigerating current range, the freezing current range, and the ambient current range; when the target current is within the preset current range, determining whether the target temperature is greater than the preset temperature and whether the ambient temperature is greater than the preset ambient temperature.

[0036] Specifically, obtain the target current corresponding to the target sensor. The target sensor includes a first sensor, a second sensor, and a third sensor. At this time, the target sensor can be understood as a temperature sensor. Install the first sensor in the refrigerating chamber of the vehicle-mounted refrigerator, and this sensor is equipped with a current sensor. The current sensor will monitor the working current of the electrical components related to the refrigerating chamber (such as the compressor and fan motor of the refrigerating chamber refrigeration system) in real time, and output the current data in the form of an electrical signal. Install the second sensor and its supporting current sensor in the freezing chamber to monitor the working current of the electrical components related to the freezing chamber (such as the compressor and fan motor of the freezing chamber refrigeration system). Install the third sensor and its supporting current sensor outside the vehicle-mounted refrigerator, and this sensor may monitor the working current of the devices related to external environment perception (such as the power supply current of the ambient temperature sensor itself). Each current sensor will convert the monitored current analog signal into a digital signal, and then transmit it to the power board of the refrigerator through the data bus. The power board receives these digital signals and stores and processes them. After obtaining the target current, compare the target current with the preset current range. The preset current range includes a refrigerating current range, a freezing current range, and an ambient current range. The setting of the preset current range is comprehensively considered based on factors such as the normal working range of the sensor, the rated current of the electrical components, and the safety operation requirements. Compare the obtained refrigerating current, freezing current, and ambient current with the corresponding preset current ranges respectively. If the target current is within the preset current range, it is considered that the current is within the normal range; if the current value exceeds the preset range, it is considered that the current is abnormal. When it is judged that the refrigerating current, freezing current, and ambient current are all within the corresponding preset current ranges, it is considered that the target sensors are all in normal working state, that is, it is defaulted that the temperature data collected by the target sensors is valid. Therefore, the temperature collected by the target sensors can be judged subsequently to provide an accurate temperature basis for subsequent refrigeration control, and to avoid the temperature collected being incorrect due to the failure of the target sensors, which affects subsequent judgments.

[0037] For example, in the refrigerating chamber, when the compressor related to refrigeration is operating, the current sensor monitors that its operating current is 2.5 A. At this time, the refrigerating current is 2.5 A. The refrigerating current range can be set to 2 A - 3 A. Since the refrigerating temperature of 2.5 A is within the refrigerating current range, the refrigerating current is within the preset current range. In the freezing chamber, when the freezing chamber fan motor is operating, the current sensor monitors that its operating current is 1.2 A. At this time, the freezing current is 1.2 A. The freezing current range can be set to 1 A - 1.5 A. Since the freezing current of 1.2 A is within the freezing current range, the freezing current is within the preset current range. When the ambient temperature sensor outside the vehicle-mounted refrigerator is operating, the current sensor monitors that its operating current is 0.3 A. At this time, the ambient current is 0.3 A. The ambient current range can be set to 0.2 A - 0.4 A. Since the ambient current of 0.3 A is within the ambient current range, the ambient current is within the preset current range.

[0038] Further, when the target current is not within the preset current range, it is determined that the target sensor is in a faulty state; a preset protection mode is determined and generated according to the faulty state. The preset protection mode includes a first processing method, a second processing method, and a third processing method. The first sensor corresponds to the first processing method, the second sensor corresponds to the second processing method, and the third sensor corresponds to the third processing method. The first processing method is to perform a first opening control and a first closing control on the step-type damping air door according to a first period. The first period includes a first duration of the first opening control and a second duration corresponding to the first closing control. The second processing method is to perform a second opening control and a second closing control on the compressor according to a second period. The second period includes a third duration of the second opening control and a fourth duration of the second closing control. The third processing method is to determine to set the third sensor to a fixed ambient temperature.

[0039] Specifically, continuously monitor the current data from the first sensor, the second sensor, and the third sensor. After each new set of current data is acquired, it is immediately compared with the corresponding preset current range. A fault determination logic is set in advance. Once it is detected that the current data of a certain sensor exceeds the preset range, the sensor is immediately marked as a fault state. At this time, the fault state includes abnormal conditions such as open circuit and short circuit. At the same time, the power supply board records information such as the time of the fault occurrence, the sensor type, and the abnormal current value for subsequent analysis and repair. After determining the sensor fault, the corresponding preset protection mode is automatically matched according to the type of the faulty sensor (the first sensor, the second sensor, or the third sensor). This matching relationship is pre-programmed into the power supply board during the design stage of the refrigerator. There is a mapping table stored inside the power supply board, which corresponds the first sensor, the second sensor, and the third sensor to the first processing method, the second processing method, and the third processing method respectively. When the first sensor fault is detected, the first processing method is found and determined from the mapping table; when the second sensor fault is detected, the second processing method is adopted; when the third sensor fault is detected, the third processing method is adopted. The first sensor refers to the refrigerating sensor. When the first sensor is in a fault state, the preset protection mode is the first processing method, and the first processing method is to perform the first opening control and the first closing control on the step damping air door according to the first cycle. The first cycle includes the first duration of the first opening control and the second duration corresponding to the first closing control. The setting of the first duration, the second duration, and the first cycle is based on the refrigeration system characteristics and safety operation requirements of the vehicle-mounted refrigerator and is obtained through experiments and optimization. For example, the first cycle is set to 30 minutes, where the first duration of the first opening control is 10 minutes and the second duration of the first closing control is 20 minutes. The motor of the step damping air door is controlled by the drive circuit to perform opening and closing operations according to the set first cycle. Within the 10 minutes of opening, the step damping air door is opened to a certain opening degree to allow cold air to enter the refrigerating chamber; within the 20 minutes of closing, the step damping air door is closed to reduce the cold air entering. The faults are classified by level. At this time, the sensor fault can be classified into the intermediate fault level. Figure 4 as shown.

[0040] When it is determined that the first sensor is in a fault state, it is determined to control the stepping damper to operate in a cycle according to the first period to ensure that the basic refrigeration function of the vehicle-mounted refrigerator is not affected. The second sensor is a freezing sensor. When the second sensor is in a fault state, the preset protection mode is the second processing method, and the second processing method is to perform the second start control and the second stop control on the compressor according to the second period. The second period includes the third duration of the second start control and the fourth duration of the second stop control. The settings of the third duration, the fourth duration, and the second period are designed to ensure that the compressor can work normally and will not be damaged due to long-term operation when the second sensor fails. For example, the first period is set to 30 minutes, where the third duration of the second start control is 10 minutes and the fourth duration of the second stop control is 20 minutes. By controlling the relay or frequency converter of the compressor, the opening and closing operations are performed according to the set second period. During the 10 minutes of opening, the compressor runs for refrigeration; during the 20 minutes of closing, the compressor stops running. The compressor is controlled according to the second period (30 minutes, 10 minutes of opening, 20 minutes of closing). In the first 30-minute period, the compressor runs for the first 1 minute and stops for the next 20 minutes; then it enters the next 30-minute period and repeats the above operations to ensure that the freezer can still maintain a certain refrigeration effect when the second sensor fails, while protecting the compressor. The third sensor is an ambient sensor. When the third sensor is in a fault state, the preset protection mode is the third processing method, and the third processing method is to determine to set the temperature of the third sensor to a fixed ambient temperature, and the fixed ambient temperature is a preset safety value, which is usually set according to the normal working ambient temperature range of the refrigerator and the performance requirements of the refrigeration system. For example, the fixed ambient temperature is set to 25 °C. In the subsequent temperature control logic, this fixed ambient temperature value will be used to replace the ambient temperature value actually monitored by the third sensor for calculation and judgment. For example, when judging whether to open the stepping damper or adjust the operating state of the compressor, 25 °C will be used as a reference for the ambient temperature. This embodiment adds a fault tolerance function. When the target sensor is in a fault state, the corresponding preset protection mode is automatically matched according to the type of the sensor, so that the stepping damper and the compressor operate in a cycle according to the set processing method, and then the fixed ambient temperature is obtained as the temperature value actually monitored by the third sensor.

[0041] Such as Figure 3As shown, the display board is connected to the power board through UART communication. The power board collects temperature through the sensor module, and then monitors the sensors, motors, refrigerator doors, voltages, and communications in the vehicle-mounted refrigerator in real time. Once a fault is detected, the corresponding processing method can be retrieved from the exception handling module. The drive module refers to adjusting the air damper according to the temperature deviation. The display board is connected to the touch button detection module, the buzzer control module, and the digital tube display module. The touch button detection module uses capacitive induction buttons for detection, that is, it detects the user's click on the capacitive induction button, and then determines the function corresponding to the button clicked by the user. The touch button detection module includes multiple buttons, and the compensation capacitor can be set to 6.8 nF, and the sensitivity is adjusted according to the actual situation. The buzzer control module uses PWM square wave control, with a 50% duty cycle and a pulse width of 4000, and emits different buzzer sounds according to the current state of the vehicle-mounted refrigerator. The digital tube display module is a two-digit digital tube display, and the digital tube is controlled by the bit selection + segment selection mode. The bit selection is effective at a high level, and the segment selection is effective at a low level. Different contents are displayed according to the operating state of the vehicle-mounted refrigerator. In addition to being connected through the UART communication protocol, the display board and the power board can also replace the UART communication protocol with the CAN bus protocol.

[0042] S102: Determine whether the target temperature is greater than the preset temperature and whether the ambient temperature is greater than the preset ambient temperature. The preset temperature includes the preset refrigeration temperature and the preset first freezing temperature.

[0043] In the above S102, when it is determined that the target sensor is in a non-fault state, that is, the temperature value obtained by the temperature sensor is valid, the obtained target temperature is compared with the preset temperature, and then the ambient temperature is compared with the preset ambient temperature. The preset temperature and the preset ambient temperature are pre-set. The preset temperature includes the preset refrigeration temperature and the preset first freezing temperature. The preset refrigeration temperature and the preset first freezing temperature are the temperature values used to determine whether to open the step damping air damper. The preset ambient temperature is also the ambient value used to determine whether to open the step damping air damper. For example, the preset refrigeration temperature can be set to 8 °C, the preset first freezing temperature can be set to -3 °C, and the preset ambient temperature can be set to 35 °C. The preset refrigeration temperature, the preset first freezing temperature, and the preset ambient temperature can also be set based on the actual situation of the vehicle-mounted refrigerator, and no more limitations are made here.

[0044] S103: When the target temperature is greater than the preset temperature and the ambient temperature is greater than the preset ambient temperature, open the step damping air damper.

[0045] In the above S103, when the target temperature is greater than the preset temperature and the ambient temperature is greater than the preset ambient temperature, that is, when the refrigeration temperature is greater than the preset refrigeration temperature, the freezing temperature is greater than the preset first freezing temperature, and the ambient temperature is greater than the preset ambient temperature, it is determined that the target temperature and the ambient temperature have reached the opening condition of the step damping air door, and an opening instruction is sent to the drive motor of the step damping air door. After receiving the instruction, the drive circuit will control the motor of the step damping air door to rotate, thereby opening the air door. If one of the target temperature and the ambient temperature is less than or equal to the preset temperature or the preset ambient temperature, it is determined that the vehicle-mounted refrigerator has not yet reached the opening condition of the step damping air door, so the temperature of the vehicle-mounted refrigerator is continuously monitored.

[0046] For example, the preset refrigeration temperature is 8 °C, the preset first freezing temperature is -3 °C, and the preset ambient temperature is 35 °C. The refrigeration temperature obtained by the temperature sensor is 11 °C, the freezing temperature is 0 °C, and the ambient temperature is 38 °C. At this time, the refrigeration temperature of 11 °C is greater than the preset refrigeration temperature of 8 °C, the freezing temperature of -3 °C is greater than the preset first freezing temperature of 0 °C, and the ambient temperature of 38 °C is greater than the preset ambient temperature of 35 °C. An opening instruction is sent to the step damping air door in the refrigerating chamber, and then the step damping air door is opened.

[0047] In addition, after determining to open the step - type damping air door, it is also necessary to analyze the freezing temperature in the freezer of the in - vehicle refrigerator, and then determine whether to start the compressor. Specifically, it includes: judging whether the freezing temperature is greater than the preset second freezing temperature; when the freezing temperature is greater than the preset second freezing temperature, determining to start the compressor; when the freezing temperature is less than the preset second freezing temperature, determining to turn off the compressor. Specifically, a freezing sensor has been installed in the freezer of the in - vehicle refrigerator. This sensor monitors the temperature of the freezer in real - time and converts the temperature into a freezing temperature value. Then, the freezing temperature is compared with the preset second freezing temperature, and the preset second freezing temperature is set according to factors such as the design requirements of the in - vehicle refrigerator, the user's usage habits, and the preservation requirements of frozen items. When the freezing temperature is greater than the preset second freezing temperature, it is determined that the condition for starting the compressor is met. Because when the freezing temperature is higher than the preset second freezing temperature, it indicates that the temperature in the freezer is not low enough, and the compressor needs to be started for refrigeration to lower the temperature of the freezer. A start signal is sent to the control circuit of the compressor. This start signal is usually a level signal or a pulse signal. After receiving the start signal, the control circuit of the compressor will turn on the power supply of the compressor, causing the compressor to start running. For example, if the freezing temperature is - 5°C and the preset second freezing temperature is - 10°C, at this time, since the freezing temperature is greater than the preset second freezing temperature, a start signal is sent to the compressor. After receiving the start signal, the compressor turns on its power supply and starts running to refrigerate the freezer. When the freezing temperature is less than the preset second freezing temperature, it is determined that the condition for turning off the compressor is met. Because at this time, the temperature in the freezer is already lower than the preset second freezing temperature, indicating that the freezer is cold enough and the compressor does not need to continue running for refrigeration to avoid damage to frozen items due to too low temperature or waste of energy. A shutdown signal is sent to the control circuit of the compressor. This shutdown signal is opposite to the start signal and may be a low - level signal. After receiving the shutdown signal, the control circuit of the compressor will cut off the power supply of the compressor, causing the compressor to stop running. For example, if the freezing temperature is - 12°C and the preset second freezing temperature is set to - 10°C, when the freezing temperature is less than the preset second freezing temperature at this time, a shutdown signal is sent to the compressor. After receiving the shutdown signal, the control circuit of the compressor cuts off the power supply of the compressor, and the compressor stops working. The temperature of the freezer will gradually rise until the condition for starting the compressor is reached again. In practical applications, the opening or closing of the compressor is not only based on the judgment of the freezing temperature, but also needs to be comprehensively considered in combination with other factors, which will not be elaborated here. As Figure 4 shown

[0048] Further, when it is determined that the compressor needs to be started, the start of the compressor also needs to be monitored to determine whether there is a start failure. After the compressor receives the start signal sent by the power board, the compressor will send a feedback signal to the power board. The feedback signal is used to indicate that the compressor has received and started normally. If the power board does not receive the feedback signal sent by the compressor within a fixed duration, it is defaulted that the compressor has a start failure. At this time, the fourth processing method is queried according to the compressor start failure. The fourth processing method is to display a fault code, that is, to display it on the display board. If the power board receives the feedback signal sent by the compressor within a fixed duration, it is defaulted that the compressor starts successfully, and the compressor can be used to refrigerate the car refrigerator normally. The faults are classified, and the compressor start failure is classified into the intermediate fault level.

[0049] In a possible implementation manner, after the car refrigerator enters the usage stage, it is necessary to monitor the cumulative operation duration of the compressor and the temperature of the defrosting sensor in the car refrigerator, and then judge the monitored operation duration and the temperature monitored by the defrosting sensor. According to the judgment result, it is determined whether defrosting operation needs to be performed, so as to effectively prevent excessive accumulation of frost and ensure the refrigeration efficiency and normal operation of the car refrigerator. Specifically, it includes: obtaining the first operation duration, where the first operation duration is the total duration of the compressor's cumulative work; judging whether the first operation duration is greater than or equal to the preset first operation duration; when the first operation duration is greater than or equal to the preset first operation duration, obtaining the first temperature monitored by the fourth sensor, where the fourth sensor is a sensor installed inside the car refrigerator; judging whether the first temperature is less than or equal to the preset first defrosting temperature; when the first temperature is less than or equal to the preset first defrosting temperature, determining to start the heater so that the heater performs defrosting operation on the car refrigerator.

[0050] Specifically, continuously monitor the operating status of the compressor. Generally, the operating status of the compressor can be obtained through its power control signal or operating feedback signal. For example, when the compressor starts, a flag bit is recorded indicating that the compressor is running; when the compressor stops, this flag bit is cleared. There is a timer or counter inside the power board to record the cumulative operating duration of the compressor. Whenever the compressor is in the operating state, the timer increments at a certain time interval (such as every minute), thereby cumulatively calculating the total operating duration of the compressor, that is, the first operating duration. Continuously record the operating duration each time since the compressor was put into use. For example, if the total historical operating duration is 2100 minutes, and the recent three operations of the compressor are 50 minutes, 60 minutes, and 80 minutes respectively, then the cumulative operating duration of the compressor is 2100 + 50 + 60 + 80 = 2290 minutes (38 hours and 10 minutes). Then compare the first operating duration with the preset first operating duration. The preset first operating duration is set according to factors such as the refrigeration system characteristics of the vehicle-mounted refrigerator, the usage environment, and the defrosting requirements. Generally, the preset first operating duration is based on experience or experimental data to ensure that after the compressor has run for a sufficient long time, a certain amount of frost may accumulate on the evaporator and defrosting is required. For example, the preset first operating duration can be set to 38 hours, indicating that when the cumulative operation of the compressor reaches 38 hours, defrosting may be required. When the first operating duration is greater than or equal to the preset first operating duration, obtain the first temperature corresponding to the fourth sensor. The fourth sensor is installed in the area of the vehicle-mounted refrigerator that is prone to frosting, usually a temperature sensor near the evaporator, and is used to monitor the temperature of the evaporator surface. The first temperature monitored by the fourth sensor reflects the accumulation of frost. The fourth sensor monitors the temperature in real time and outputs the monitored temperature as the first temperature. Then determine whether the first temperature is less than or equal to the preset first defrosting temperature. The preset first defrosting temperature is set according to the temperature inside the vehicle-mounted refrigerator under normal frost-free conditions and the temperature threshold when frost begins to accumulate. When the first temperature is less than or equal to the preset first defrosting temperature, it is determined that the condition for starting the heater has been met. Because at this time, the surface temperature of the evaporator is low enough, indicating that the frost may have accumulated to the extent that defrosting is required. A start signal is sent to the control circuit of the heater. This start signal is usually a level signal or a pulse signal. After the control circuit of the heater receives the start signal, it turns on the power supply of the heater to make the heater start working. After the heater starts, continuously monitor the defrosting process. As Figure 5 shown.

[0051] In the above example, it is determined that the first running duration is 38 hours and 10 minutes, the preset first running duration is 38 hours, the first running duration is greater than the preset running duration. Then, the first temperature corresponding to the fourth sensor is obtained, and the first temperature is -2°C. The preset first defrosting temperature is set to 3°C. When the first temperature is less than the preset first defrosting temperature, it is determined that the frost in the vehicle-mounted refrigerator may have accumulated to the extent that defrosting is required. Therefore, the heater needs to be started to perform the defrosting operation.

[0052] In addition, when the first running duration is less than the preset first running duration, or the first temperature is greater than the preset defrosting temperature, it is defaulted that the inside of the vehicle-mounted refrigerator has not yet reached the start condition for the defrosting operation. Therefore, the running duration of the compressor and the temperature of the fourth sensor are continuously monitored. Once the first running duration is greater than or equal to the preset first running duration, and the first temperature is less than or equal to the preset defrosting temperature, the vehicle-mounted refrigerator can be defrosted.

[0053] Furthermore, while starting the heater to defrost the inside of the vehicle-mounted refrigerator, the defrosting process is accurately monitored. After the defrosting is completed, the heater is timely turned off, and the compressor or the step damping air door is prohibited from being turned on within a certain period of time to ensure the defrosting effect and the stable operation of the vehicle-mounted refrigerator. Specifically, it includes: at intervals of the preset time, obtaining the second temperature and the second running duration. The second running duration is the total duration of the heater for heating, and the second temperature is the temperature corresponding to the fourth sensor; judging whether the second temperature is greater than the preset second defrosting temperature, or whether the second running duration is greater than or equal to the preset second running duration; when the second temperature is greater than the preset second defrosting temperature, or the second running duration is greater than or equal to the preset second running duration, it is determined to turn off the heater and prohibit the compressor or the step damping air door from being turned on within the preset duration.

[0054] Specifically, when starting the heater for defrosting operation, a timer will be triggered to start timing. After a period of time, the second temperature of the fourth sensor and the second running duration of the heater will be obtained. The fourth sensor continuously monitors the temperature inside the vehicle-mounted refrigerator and reads the current temperature value, which is the second temperature. A counter for recording the running duration of the heater is used. When the heater starts, the counter starts counting. Every time a certain time unit (such as 1 minute) passes, the value of the counter increases by 1. When the timer is triggered, the current value of the counter is taken, and this value is the total running duration of the heater heating, that is, the second running duration. For example, the preset time interval is 45 minutes, and the heater has been running for some time. When the timer reaches 45 minutes, the temperature of the fourth sensor is read, and the second temperature is obtained as 9°C; at the same time, the value of the counter is read, and the second running duration is obtained as 40 minutes. When judging whether the second temperature is greater than the preset second defrosting temperature, or whether the second running duration is greater than or equal to the preset second running duration, the preset second defrosting temperature is set according to the temperature that the easily frosted surface inside the vehicle-mounted refrigerator should reach when defrosting is completed, and the preset duration is set according to factors such as the power of the heater, the heat required for defrosting, and safety requirements. As long as the second temperature is greater than the preset second defrosting temperature, or the second running duration is greater than or equal to the preset second running duration, the condition for turning off the heater will be met.

[0055] For example, the preset second defrosting temperature is 8°C, and the preset second running duration is 40 minutes. The currently obtained second temperature is 9°C, and the second running duration is 38 minutes. First, judge that the second temperature 9°C > 8°C, which meets the condition; although the second running duration 38 minutes < 40 minutes and does not meet the second condition, since the condition that the second temperature is greater than the preset second defrosting temperature is met, the overall judgment result is that the condition for turning off the heater is met. After judging that the condition for turning off the heater is met, a shutdown signal will be sent to the control circuit of the heater. This shutdown signal is usually a level signal or a pulse signal, which is opposite to the startup signal. After receiving the shutdown signal, the control circuit of the heater will disconnect the power supply of the heater, causing the heater to stop working. After determining that the heater has stopped working, a timer can be started to start timing. The timing is used to prohibit the compressor or the step damper from being turned on within the preset duration. Within the preset duration, even if other conditions (such as temperature requirements) meet the requirements for turning on the compressor or the step damper, the vehicle-mounted refrigerator will, according to the status of the timer, refuse to send a startup signal. The preset duration can be set to 6 minutes, that is, within 6 minutes after turning off the heater, it is not allowed to turn on the compressor or the step damper until 6 minutes have passed, and then the compressor or the step damper can be turned on according to the actual situation.

[0056] Furthermore, the current value corresponding to the fourth sensor is obtained in real time and compared with a preset range. Here, the preset range refers to the current range corresponding to the normal operation of the fourth sensor. When the current value is not within the preset range, it is determined that the fourth sensor is in a fault state. According to the fourth sensor, the processing method is to display a fault code, and the temperature monitored by the fourth sensor is set to 0°C. The faults are superimposed and classified, and the fourth sensor fault can be classified as a medium-level fault grade. After it is determined that the fourth sensor has a fault, the defrosting process is automatically executed according to a fixed duration of 40 minutes, and the number of abnormal times is recorded for adjusting the subsequent defrosting interval.

[0057] S104: Calculate the target temperature and the preset temperature to obtain a temperature deviation, which includes a refrigerating temperature deviation and a freezing temperature deviation.

[0058] In the above S104, after it is determined to open the step damping air door, the target temperature and the preset temperature are calculated to obtain a temperature deviation, which includes a refrigerating temperature deviation and a freezing temperature deviation. The refrigerating temperature deviation is obtained by calculating the refrigerating temperature and the preset refrigerating temperature, and the freezing temperature deviation is obtained by calculating the freezing temperature and the preset first freezing temperature.

[0059] For example, the preset refrigerating temperature is 8°C, the preset first freezing temperature is -3°C, the refrigerating temperature obtained by the temperature sensor is 11°C, and the freezing temperature is 0°C. At this time, the refrigerating temperature deviation is 3°C, and the freezing temperature deviation is -2°C.

[0060] S105: Determine whether the temperature deviation is greater than a preset threshold, which includes a preset refrigerating threshold and a preset freezing threshold.

[0061] In the above S105, after obtaining the temperature deviation, the temperature deviation is compared with the preset threshold, which includes a preset refrigerating threshold and a preset freezing threshold. The preset refrigerating threshold and the preset freezing threshold are the thresholds set for adjusting the air door of the vehicle-mounted refrigerator. The refrigerating temperature deviation is compared with the preset refrigerating threshold, and the freezing temperature deviation is compared with the preset freezing threshold. Only when the temperature deviation exceeds the preset threshold will the adjustment of the air door opening be triggered. This avoids frequent actions of the air door due to small fluctuations in temperature, reduces energy waste and equipment wear caused by frequent adjustment, and can also better ensure the stability of the refrigeration effect. For example, the preset refrigerating threshold can be set to ±1°C, and the preset freezing threshold can be set to ±1.5°C.

[0062] S106: When the temperature deviation is greater than the preset threshold, determine the first opening degree according to the temperature deviation.

[0063] In the above S106, when the temperature deviation is greater than the preset threshold, it is determined that the step - type damping air door needs to be adjusted, and the first opening degree is determined according to the temperature deviation. The temperature deviation is input into the preset opening degree library for query to obtain the first opening degree. The preset opening degree library is obtained by dynamically binding the mechanical travel of the step - type damping air door and the temperature deviation in advance, and then storing the corresponding relationship after binding into the preset opening degree library, so as to subsequently find the corresponding mechanical travel in the preset opening degree library according to the temperature deviation, and then determine the air door opening degree according to the mechanical travel. Since the mechanical travel of the step - type damping air door is 1850 steps, the 1850 - step mechanical travel is dynamically bound to the temperature deviation. This means that the opening degree of the air door is no longer limited to several fixed gears, but can be continuously and dynamically adjusted according to the actual temperature deviation to achieve stepless adjustment.

[0064] For example, the total mechanical travel of the step - type damping air door is 1850 steps, corresponding to the air door from fully closed (0 steps) to fully open (1850 steps). The larger the air door opening degree, the more cold quantity is allowed to pass through, and the smaller the air door opening degree, the less cold quantity is allowed to pass through. The relationship between the number of steps and the cold quantity distribution is linear or non - linear. The adjustment of the number of steps of the air door opening degree is obtained based on the comparison between the temperature deviation and the preset refrigeration threshold. It can be determined based on experiments that for every 0.5 °C increase in the temperature deviation, the number of steps increases by 50 steps. If the refrigeration temperature deviation is 3 °C, the air door opening degree corresponding to 300 steps is determined according to the refrigeration temperature deviation, that is, the first opening degree is 300 steps. At this time, the first opening degree refers to the air door adjustment opening degree corresponding to the refrigeration temperature deviation. If the freezing temperature deviation is - 2 °C, the air door opening degree corresponding to 200 steps is determined according to the freezing temperature deviation, that is, the first opening degree is 200 steps. At this time, the first opening degree refers to the air door adjustment opening degree corresponding to the freezing temperature deviation. In practical applications, the cold quantity and the air door opening degree may be non - linearly related, so the mapping relationship needs to be corrected through experimental data. In addition to binding the temperature deviation and the mechanical travel in advance, hysteresis control algorithm and fuzzy PID compound control can also be used. Among them, PID is used for the freezer and fuzzy control is used for the refrigerator compartment, so as to dynamically adjust the opening degree of the step - type damping air door.

[0065] S107: Generate an adjustment instruction based on the first opening degree, and control the step - type damping air door to adjust from the second opening degree to the first opening degree according to the adjustment instruction, so that the step - type damping air door controls the cold quantity of the vehicle - mounted refrigerator according to the first opening degree. The second opening degree is the initial opening degree of the step - type damping air door.

[0066] In the above S107, after generating the adjustment instruction according to the determined first opening degree, the adjustment instruction is sent to the drive motor of the step - type damping air door. After receiving the adjustment instruction, the drive motor will control the stepping motor to rotate the corresponding number of steps, so as to adjust the air door from the current second opening degree to the first opening degree.

[0067] For example, the initial refrigerating opening degree (the second opening degree) of the step damping air door is 100 steps. According to the refrigerating temperature deviation, the first opening degree is determined to be 300 steps. The drive circuit will control the motor to rotate so that the opening degree of the refrigerating air door is adjusted from 100 steps to 300 steps. The initial freezing opening degree (the second opening degree) of the step damping air door is 150 steps. According to the freezing temperature deviation, the first opening degree is determined to be 200 steps. The drive circuit will control the motor to rotate so that the opening degree of the freezing air door is adjusted from 150 steps to 200 steps.

[0068] In addition, when the temperature deviation is less than the preset threshold value, it is determined that there is no need to automatically adjust the air door of the vehicle-mounted refrigerator at this time. Only when the temperature deviation is greater than the preset threshold value will the adjustment be carried out, avoiding the frequent operation of the air door caused by the small fluctuations of the temperature.

[0069] In a possible implementation, when dynamically adjusting the opening degree of the stepper damping air door, the vehicle-mounted refrigerator can also be precisely temperature-controlled to achieve precise control of the temperature of the vehicle-mounted refrigerator and improve temperature uniformity. Since the stepper motor drive in this embodiment adopts a two-phase excitation (4-step) drive method, two-phase excitation is a drive method for stepper motors. Here, "4 steps" means that it takes 4 steps to complete a complete excitation cycle. In stepper motor drive, the excitation method affects the operating performance of the motor, such as accuracy, torque, etc. The two-phase excitation method can make the motor run more smoothly, reduce vibration and noise, and at the same time help improve the positioning accuracy of the motor. A phase table is predefined. The phase table is the key to achieving precise stepper control. It stores a series of specific phase parameters, and these parameters determine the excitation state of the stepper motor at different times. By sequentially energizing the windings of the motor according to the sequence in the phase table, the rotation steps and direction of the motor can be precisely controlled. The parameters of the stepper motor phase table can be obtained through a large number of experiments and optimizations. For example, the phase table parameters can be set to 0x09, 0x08, 0x0C, 0x04, 0x06, 0x02, 0x03, 0x01. The specific excitation sequence can be adjusted according to the motor characteristics. Different stepper motors may have different electrical and mechanical characteristics, such as resistance, inductance, step angle, etc. Adjusting the excitation sequence according to the characteristics of the actually used motor can further optimize the performance of the motor and ensure precise stepper control on different motors. Each step corresponds to a 11.25° rotation of the motor. This indicates that when the stepper motor receives a control pulse each time, it will perform an excitation state switch according to the predefined phase table, so that the motor rotates 11.25°. The stepper damping air door moves about 0.05° / step. The motor is connected to the air door through a transmission mechanism (such as gears, lead screws, etc.). The small-angle rotation of the motor is converted by the transmission mechanism, so that the air door moves at a high resolution (0.05° / step), thereby enabling precise adjustment of the opening degree of the air door, and then precisely controlling the cold air entering the refrigerator, and controlling the temperature fluctuation within ±0.5°C, significantly improving the temperature uniformity. In a possible implementation, when it is determined that the vehicle-mounted refrigerator is in the defrosting operation, the state of "defrosting in progress" can be displayed on the display board of the vehicle-mounted refrigerator, a closing instruction is generated according to the defrosting operation, and the stepper damping air door is closed according to the closing instruction, accurately generating the closing instruction and controlling the stepper damping air door to close, so as to ensure the smooth progress of the defrosting process and avoid the mixing of hot and cold air during the defrosting process from affecting the defrosting effect and the refrigeration performance of the refrigerator. The prerequisite for sending the closing instruction at this time is that it is monitored that the stepper damping air door is in the open state before sending the closing instruction to the stepper damping air door. If the stepper damping air door is in the closed state, there is no need to send the closing instruction to the stepper damping air door. When a fault is detected in the fourth sensor, a closing instruction also needs to be sent to the stepper damping air door.

[0070] In a possible implementation, it is also possible to monitor the current of the fan module in Figure 2 , then judge the current. When the current is not within the set range, it is determined that the fan is in a fault state. After determining that the fan is in a fault state, the first abnormal handling method needs to be adopted. At this time, the first abnormal handling method means forced shutdown after 1 minute. The fan fault is classified into the severe fault level. It is also possible to detect faults in the communication connection between the display board and the power supply board. It can be stipulated to receive the signal sent by the display board within a preset time. The preset time can be set to 20 minutes. If the signal sent by the display board is not received within 20 minutes, it is confirmed that there is a communication fault. After determining that there is a communication fault, the second abnormal handling method is adopted. The second abnormal handling method is to display a fault code, and the communication fault is classified into the intermediate fault level. When the vehicle-mounted refrigerator is in the working state, the voltage of the vehicle-mounted refrigerator is monitored in real time to judge whether the voltage is less than the low voltage or greater than the high voltage. When the voltage is less than the low voltage or greater than the high voltage, the duration for which the voltage is maintained is obtained. If the maintained duration is greater than or equal to the preset third duration, it is default that the vehicle-mounted refrigerator has a voltage fault. According to the voltage fault, the third abnormal handling method is adopted. The third abnormal handling method means displaying a fault code and performing shutdown protection. The voltage fault is classified into the severe fault level. For example, the low voltage can be set to 9V, the high voltage can be set to 17V, the voltage is 18V, the maintained duration is 4 seconds, and the preset third duration is set to 3 seconds. At this time, the voltage is greater than the high voltage, and the maintained duration is greater than the preset third duration, so it is default that the vehicle-mounted refrigerator has a voltage fault.

[0071] The embodiment of the present application also provides a control system for a vehicle-mounted refrigerator, Figure 6 which is a schematic structural diagram of a control system for a vehicle-mounted refrigerator provided by the embodiment of the present application. Refer to Figure 6 , the system includes an acquisition unit 601, a processing unit 602, and an adjustment unit 603.

[0072] The acquisition unit 601 determines that the vehicle-mounted refrigerator is in the powered-on state, and acquires the target temperature and the ambient temperature corresponding to the vehicle-mounted refrigerator. The target temperature includes the refrigeration temperature and the freezing temperature.

[0073] The processing unit 602 judges whether the target temperature is greater than the preset temperature and whether the ambient temperature is greater than the preset ambient temperature. The preset temperature includes the preset refrigeration temperature and the preset first freezing temperature; when the target temperature is greater than the preset temperature and the ambient temperature is greater than the preset ambient temperature, the step-type damping air door is opened; the target temperature is calculated with the preset temperature to obtain a temperature deviation. The temperature deviation includes the refrigeration temperature deviation and the freezing temperature deviation; it is judged whether the temperature deviation is greater than the preset threshold. The preset threshold includes the preset refrigeration threshold and the preset freezing threshold; when the temperature deviation is greater than the preset threshold, the first opening degree is determined according to the temperature deviation.

[0074] The adjustment unit 603 generates an adjustment instruction based on the first opening degree, and controls the step-type damping air door to adjust from the second opening degree to the first opening degree according to the adjustment instruction, so that the step-type damping air door controls the cooling capacity of the vehicle-mounted refrigerator according to the first opening degree, and the second opening degree is the initial opening degree of the step-type damping air door.

[0075] In a possible implementation manner, the acquisition unit 601 is configured to acquire a target current corresponding to a target sensor, the target sensor includes a first sensor, a second sensor, and a third sensor, the target current includes a refrigerating current, a freezing current, and an ambient current, the refrigerating current is the current corresponding to the first sensor installed in the refrigerating chamber, the freezing current is the current corresponding to the second sensor installed in the freezing chamber, and the ambient current is the current corresponding to the third sensor installed outside the vehicle-mounted refrigerator; the processing unit 602 is configured to determine whether the target current is within a preset current range, the preset current range includes a refrigerating current range, a freezing current range, and an ambient current range; when the target current is within the preset current range, it is determined whether the target temperature is greater than a preset temperature and whether the ambient temperature is greater than a preset ambient temperature.

[0076] In a possible implementation manner, the processing unit 602 is configured to determine that the target sensor is in a fault state when the target current is not within the preset current range; generate a preset protection mode according to the fault state, the preset protection mode includes a first processing method, a second processing method, and a third processing method, the first sensor corresponds to the first processing method, the second sensor corresponds to the second processing method, the third sensor corresponds to the third processing method, the first processing method is to perform a first opening control and a first closing control on the step-type damping air door according to a first period, the first period includes a first duration of the first opening control and a second duration corresponding to the first closing control; the second processing method is to perform a second opening control and a second closing control on the compressor according to a second period, the second period includes a third duration of the second opening control and a fourth duration of the second closing control; the third processing method is to determine to set the third sensor to a fixed ambient temperature.

[0077] In a possible implementation manner, the processing unit 602 is configured to determine whether the freezing temperature is greater than a preset second freezing temperature; when the freezing temperature is greater than the preset second freezing temperature, it is determined to start the compressor; when the freezing temperature is less than the preset second freezing temperature, it is determined to turn off the compressor.

[0078] In a possible implementation, the obtaining unit 601 is configured to obtain a first operation duration, where the first operation duration is the total duration of cumulative operation of the compressor; the processing unit 602 is configured to determine whether the first operation duration is greater than or equal to a preset first operation duration; the obtaining unit 601 is configured to, when the first operation duration is greater than or equal to the preset first operation duration, obtain a first temperature monitored by a fourth sensor, where the fourth sensor is a sensor installed inside the vehicle-mounted refrigerator; the processing unit 602 is configured to determine whether the first temperature is less than or equal to a preset first defrosting temperature; when the first temperature is less than or equal to the preset first defrosting temperature, it is determined to start a heater so that the heater performs a defrosting operation on the vehicle-mounted refrigerator.

[0079] In a possible implementation, the obtaining unit 601 is configured to obtain a second temperature and a second operation duration at preset time intervals, where the second operation duration is the total duration of heating by the heater, and the second temperature is the temperature corresponding to the fourth sensor; the processing unit 602 is configured to determine whether the second temperature is greater than a preset second defrosting temperature, or whether the second operation duration is greater than or equal to a preset second operation duration; when the second temperature is greater than the preset second defrosting temperature, or the second operation duration is greater than or equal to the preset second operation duration, it is determined to turn off the heater and prohibit starting the compressor or the step damper within a preset duration.

[0080] In a possible implementation, the adjusting unit 603 is configured to determine that the vehicle-mounted refrigerator is in a defrosting operation, generate a closing instruction according to the defrosting operation, so as to close the step damper according to the closing instruction.

[0081] It should be noted that: when the system provided in the above embodiments realizes its functions, only the above-mentioned division of each functional module is used for illustration. In actual applications, the above functions can be allocated to different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. In addition, the system and method embodiments provided in the above embodiments belong to the same concept, and the specific implementation process is detailed in the method embodiments, which will not be repeated here.

[0082] This application also discloses an electronic device. Refer to Figure 7 , Figure 7 This is a schematic structural diagram of an electronic device provided by an embodiment of the present application. The electronic device 700 may include: at least one processor 701, at least one network interface 704, a user interface 703, a memory 702, and at least one communication bus 705.

[0083] Among them, the communication bus 705 is used to realize the connection and communication between these components.

[0084] Among them, the user interface 703 may include a display screen and a camera. Optionally, the user interface 703 may further include standard wired interfaces and wireless interfaces.

[0085] Among them, the network interface 704 may optionally include standard wired interfaces and wireless interfaces (such as WI-FI interfaces).

[0086] Among them, the processor 701 may include one or more processing cores. The processor 701 connects various parts within the entire server through various interfaces and circuits. By running or executing instructions, programs, code sets, or instruction sets stored in the memory 702, and by calling the data stored in the memory 702, it executes various functions of the server and processes data. Optionally, the processor 701 may be implemented in at least one of the following hardware forms: digital signal processing (DSP), field-programmable gate array (FPGA), and programmable logic array (PLA). The processor 701 may integrate one or several combinations of a central processing unit (CPU), a graphics processing unit (GPU), and a modem. Among them, the CPU mainly processes the operating system, user interfaces, and application requests, etc.; the GPU is responsible for rendering and drawing the content to be displayed on the display screen; the modem is used to process wireless communications. It can be understood that the above-mentioned modem may not be integrated into the processor 701 and may be implemented separately through a single chip.

[0087] Among them, the memory 702 may include random access memory (RAM) and may also include read-only memory. Optionally, the memory 702 includes a non-transitory computer-readable storage medium. The memory 702 can be used to store instructions, programs, codes, code sets, or instruction sets. The memory 702 may include a program storage area and a data storage area. Among them, the program storage area can store instructions for implementing the operating system, instructions for at least one function (such as touch function, sound playback function, image playback function, etc.), instructions for implementing the above-mentioned method embodiments, etc.; the data storage area can store the data involved in the above-mentioned method embodiments. Optionally, the memory 702 may further be at least one storage device located far from the aforementioned processor 701.

[0088] As shown Figure 7 in FIG. 2, the memory 702, as a computer storage medium, may include an operating system, a network communication module, a user interface module, and an application program for monitoring temperature anomalies of a mobile phone.

[0089] In Figure 7 the electronic device 700 shown in FIG. 3, the user interface 703 is mainly used to provide an interface for the user to input data and obtain the data input by the user; while the processor 701 can be used to call the application program for monitoring temperature anomalies of a mobile phone stored in the memory 702. When executed by one or more processors, the electronic device is caused to execute one or more of the methods described in the foregoing embodiments.

[0090] It should be noted that, for the foregoing method embodiments, for simplicity of description, they are all expressed as a series of action combinations. However, those skilled in the art should know that this application is not limited by the described action sequence, because according to this application, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0091] In the above embodiments, the descriptions of the various embodiments have their own emphases. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0092] In several embodiments provided by this application, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some service interfaces. The indirect couplings or communication connections of the devices or units can be in electrical or other forms.

[0093] The units described as separate components may or may not be physically separated. The components shown as units may or may not be physical units, that is, they may be located in one place, or they may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0094] In addition, the functional units in the various embodiments of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of a software functional unit.

[0095] If the above-mentioned integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a computer-readable memory. Based on this understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, may be embodied in the form of a software product. The computer software product is stored in a memory and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned memory includes: various media such as USB flash drives, mobile hard disks, magnetic disks, or optical discs that can store program codes.

[0096] The above are only exemplary embodiments of the present disclosure, and the scope of the present disclosure cannot be limited thereby. That is, any equivalent changes and modifications made in accordance with the teachings of the present disclosure still fall within the scope covered by the present disclosure. After considering the specification and the practice of the present disclosure, those skilled in the art will easily think of other implementation manners of the present disclosure. The present application aims to cover any variations, uses, or adaptive changes of the present disclosure, and these variations, uses, or adaptive changes follow the general principles of the present disclosure and include the common general knowledge or conventional technical means in the technical field not recorded in the present disclosure.

Claims

1. A control method for a vehicle-mounted refrigerator, characterized in that, The method includes: Determine that the vehicle-mounted refrigerator is in a powered-on state, and obtain the target temperature and the ambient temperature corresponding to the vehicle-mounted refrigerator, where the target temperature includes a refrigerating temperature and a freezing temperature; Judge whether the target temperature is greater than a preset temperature, and whether the ambient temperature is greater than a preset ambient temperature, where the preset temperature includes a preset refrigerating temperature and a preset first freezing temperature; When the target temperature is greater than the preset temperature and the ambient temperature is greater than the preset ambient temperature, turn on the step damping air door; Calculate the temperature deviation by calculating the target temperature and the preset temperature, where the temperature deviation includes a refrigerating temperature deviation and a freezing temperature deviation; Judge whether the temperature deviation is greater than a preset threshold, where the preset threshold includes a preset refrigerating threshold and a preset freezing threshold; When the temperature deviation is greater than the preset threshold, determine a first opening degree according to the temperature deviation; Generate an adjustment instruction based on the first opening degree, and control the step damping air door to adjust from a second opening degree to the first opening degree according to the adjustment instruction, so that the step damping air door controls the cooling capacity of the vehicle-mounted refrigerator according to the first opening degree, and the second opening degree is the initial opening degree of the step damping air door.

2. The method according to claim 1, characterized in that, After obtaining the target temperature and the ambient temperature corresponding to the vehicle-mounted refrigerator, where the target temperature includes a refrigerating temperature and a freezing temperature, the method further includes: Obtain the target current corresponding to the target sensor, where the target sensor includes a first sensor, a second sensor, and a third sensor, the target current includes a refrigerating current, a freezing current, and an ambient current, the refrigerating current is the current corresponding to the first sensor installed in the refrigerating compartment, the freezing current is the current corresponding to the second sensor installed in the freezing compartment, and the ambient current is the current corresponding to the third sensor installed outside the vehicle-mounted refrigerator; Judge whether the target current is within a preset current range, where the preset current range includes a refrigerating current range, a freezing current range, and an ambient current range; When the target current is within the preset current range, determine whether the target temperature is greater than the preset temperature and whether the ambient temperature is greater than the preset ambient temperature.

3. The method according to claim 2, wherein After judging whether the target current is within the preset current range, the method further includes: When the target current is not within the preset current range, determine that the target sensor is in a fault state; Determine to generate a preset protection mode according to the fault state. The preset protection mode includes a first processing method, a second processing method, and a third processing method. The first sensor corresponds to the first processing method, the second sensor corresponds to the second processing method, and the third sensor corresponds to the third processing method. The first processing method is to perform a first opening control and a first closing control on the step damping air door according to a first period. The first period includes a first duration of the first opening control and a second duration corresponding to the first closing control. The second processing method is to perform a second opening control and a second closing control on the compressor according to a second period. The second period includes a third duration of the second opening control and a fourth duration of the second closing control. The third processing method is to determine to set the third sensor to a fixed ambient temperature.

4. The method according to claim 2, wherein After "when the target current is within the preset current range", the method further includes: Judge whether the freezing temperature is greater than a preset second freezing temperature; When the freezing temperature is greater than the preset second freezing temperature, determine to start the compressor; When the freezing temperature is less than the preset second freezing temperature, determine to turn off the compressor.

5. The method according to claim 4, wherein After "acquire the target temperature and the ambient temperature corresponding to the vehicle-mounted refrigerator, where the target temperature includes the refrigerating temperature and the freezing temperature", the method further includes: Acquire a first operation duration, where the first operation duration is the total duration of the compressor's cumulative operation; Judge whether the first operation duration is greater than or equal to a preset first operation duration; When the first operation duration is greater than or equal to the preset first operation duration, acquire a first temperature monitored by a fourth sensor, where the fourth sensor is a sensor installed inside the vehicle-mounted refrigerator; Judge whether the first temperature is less than or equal to a preset first defrosting temperature; When the first temperature is less than or equal to the preset first defrosting temperature, determine to start the heater so that the heater performs a defrosting operation on the vehicle-mounted refrigerator.

6. The method according to claim 5, characterized in that After "when the first temperature is less than or equal to the preset first defrosting temperature, determine to start the heater so that the heater performs a defrosting operation on the vehicle-mounted refrigerator", the method further includes: At an interval of a preset time, acquire a second temperature and a second operation duration, where the second operation duration is the total duration of the heater's heating, and the second temperature is the temperature corresponding to the fourth sensor; Judge whether the second temperature is greater than a preset second defrosting temperature, or whether the second operation duration is greater than or equal to a preset second operation duration; When the second temperature is greater than the preset second defrosting temperature, or the second operation duration is greater than or equal to the preset second operation duration, determine to turn off the heater and prohibit starting the compressor or the step damping air door within a preset duration.

7. The method according to claim 5, characterized in that After "when the first temperature is less than or equal to the preset first defrosting temperature, determine to start the heater so that the heater performs a defrosting operation on the vehicle-mounted refrigerator", the method further includes: Determine that the vehicle-mounted refrigerator is in the defrosting operation, generate a closing instruction according to the defrosting operation, so as to close the step damping air door according to the closing instruction.

8. A control system for a vehicle-mounted refrigerator, characterized in that, The system includes an acquisition unit (601), a processing unit (602), and an adjustment unit (603); The acquisition unit (601) determines that the vehicle-mounted refrigerator is in a powered-on state, and acquires the target temperature and the ambient temperature corresponding to the vehicle-mounted refrigerator, where the target temperature includes a refrigerating temperature and a freezing temperature; The processing unit (602) determines whether the target temperature is greater than a preset temperature, and whether the ambient temperature is greater than a preset ambient temperature, where the preset temperature includes a preset refrigerating temperature and a preset first freezing temperature; when the target temperature is greater than the preset temperature and the ambient temperature is greater than the preset ambient temperature, open the step damping air door; calculate the target temperature and the preset temperature to obtain a temperature deviation, where the temperature deviation includes a refrigerating temperature deviation and a freezing temperature deviation; determine whether the temperature deviation is greater than a preset threshold, where the preset threshold includes a preset refrigerating threshold and a preset freezing threshold; when the temperature deviation is greater than the preset threshold, determine a first opening degree according to the temperature deviation; The adjustment unit (603) generates an adjustment instruction based on the first opening degree, and controls the step damping air door to adjust from a second opening degree to the first opening degree according to the adjustment instruction, so that the step damping air door controls the cooling capacity of the vehicle-mounted refrigerator according to the first opening degree, where the second opening degree is the initial opening degree of the step damping air door.

9. An electronic device, characterized in that, It includes a processor (701), a memory (702), a user interface (703), and a network interface (704). The memory (702) is used to store instructions. The user interface (703) and the network interface (704) are used to communicate with other devices. The processor (701) is used to execute the instructions stored in the memory (702) so that the electronic device (700) executes the method according to any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores instructions, and when the instructions are executed, the method according to any one of claims 1-7 is executed.

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