Control method and system for vehicle refrigerator

Abstract

A control method and system for a vehicle refrigerator relate to the technical field of refrigeration equipment control. In this method, the vehicle refrigerator is determined to be in a powered-on state, and the corresponding target temperature and ambient temperature of the vehicle refrigerator are obtained; when the target temperature is greater than a preset temperature, and the ambient temperature is greater than the preset ambient temperature, a step-type damping damper is opened; the target temperature and the preset temperature are calculated to obtain a temperature deviation; a determination is made as to whether the temperature deviation is greater than a preset threshold; when the temperature deviation is greater than the preset threshold, a first opening is determined based on the temperature deviation; an adjustment instruction is generated based on the first opening, and the step-type damping damper is controlled to adjust from a second opening to a first opening according to the adjustment instruction, so that the step-type damping damper controls the cooling capacity of the vehicle refrigerator according to the first opening, with the second opening being the initial opening of the step-type damping damper. Implementing the technical solution provided by this application solves the problems caused by the solenoid valve-driven on-off control method.

Description

Technical Field

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

[0002] As people's quality of life continues to improve, they are increasingly taking long-distance road trips or traveling during their leisure time. During these long journeys, car refrigerators have become a crucial part of travel gear, thanks to their ability to keep food and drinks fresh and cold, as well as providing suitable storage conditions for other special items that require refrigeration, ensuring their quality and safety.

[0003] In terms of operating principle, car refrigerators achieve refrigeration based on a vapor-compression refrigeration cycle. Specifically, a compressor compresses the refrigerant, increasing its pressure and temperature. The high-temperature, high-pressure refrigerant then enters the condenser, releasing heat and liquefying. After the liquid refrigerant is reduced in pressure by a throttling device, it enters the evaporator, where it absorbs heat and vaporizes, achieving the cooling effect and completing the refrigeration cycle. Given that car refrigerators typically have both a refrigerator and a freezer compartment, solenoid valves can be used to control the flow of refrigerant to effectively distribute the refrigerant to these two temperature zones. These solenoid valves switch between different refrigeration circuits, directing refrigerant flow to the corresponding evaporator in the refrigerator or freezer. However, solenoid valves only have two states: fully open and fully closed. This on-off control method makes it difficult to precisely distribute cooling capacity to meet the varying temperature requirements of the refrigerator and freezer compartments. The inability to precisely adjust the refrigerant distribution ratio between the two temperature zones can result in overcooling one zone and undercooling the other, thus affecting overall cooling efficiency.

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

[0005] The present application provides a control method and system for a vehicle refrigerator, which effectively solves the problems caused by the solenoid valve driven switch control method and improves the cooling effect of the vehicle refrigerator.

[0006] In a first aspect, the present application provides a control method for a vehicle refrigerator, the method comprising: determining whether the vehicle refrigerator is in a power-on state, obtaining a target temperature and an ambient temperature corresponding to the vehicle refrigerator, the target temperature including a refrigeration temperature and a freezing temperature; judging 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 including 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, opening a step-by-step damping damper; calculating the target temperature and the preset temperature to obtain a temperature deviation, the temperature deviation including a refrigeration temperature deviation and a freezing temperature deviation; judging whether the temperature deviation is greater than a preset threshold, the preset threshold including a preset refrigeration threshold and a preset freezing threshold; when the temperature deviation is greater than the preset threshold, determining a first opening according to the temperature deviation; generating an adjustment instruction based on the first opening, and controlling the step-by-step damping damper to adjust from a second opening to a first opening according to the adjustment instruction, so that the step-by-step damping damper controls the cooling capacity of the vehicle refrigerator according to the first opening, and the second opening is the initial opening of the step-by-step damping damper.

[0007] By adopting the above technical solution, a target temperature and an ambient temperature are first obtained respectively. When the target temperature is greater than a preset temperature and the ambient temperature is greater than the preset ambient temperature, the step-type damping damper is determined to be opened. Since the target temperature includes the refrigeration temperature and the freezing temperature, the solenoid valve control method often regulates the refrigerator and freezer compartments as a whole and cannot perceive the independent temperature changes of the two temperature zones. By independently monitoring the temperatures of the two temperature zones, the actual temperature state of each temperature zone can be accurately understood. The obtained target temperature is compared with the corresponding preset temperature to calculate the temperature deviation. The temperature deviation is then compared with a preset threshold. When the temperature deviation is greater than the preset threshold, a first opening of the step-type damping damper is determined based on the temperature deviation, and the adjustment range of the step-type damping damper opening is determined based on the first opening. The step-type damping damper can dynamically adjust the damper opening based on the real-time monitored temperature deviation, thereby dynamically adjusting the refrigerant distribution ratio between the refrigerator and freezer compartments. This dynamic adjustment mechanism can keep the temperature in the vehicle refrigerator within a relatively stable range, improve the cooling effect and energy efficiency, and solve the problem that the solenoid valve on-off control cannot achieve dynamic cooling capacity distribution.

[0008] Optionally, after obtaining the target temperature and ambient temperature corresponding to the car refrigerator, the target temperature including the refrigeration temperature and the freezing temperature, the method also includes: obtaining the target current corresponding to the target sensor, the target sensor including the first sensor, the second sensor and the third sensor, the target current including the refrigeration current, the freezing current and the ambient current, the refrigeration current is the current corresponding to the first sensor installed in the refrigeration chamber, the freezing current is the current corresponding to the second sensor installed in the freezer chamber, and the ambient current is the current corresponding to the third sensor installed outside the car refrigerator; judging whether the target current is in a preset current range, the preset current range includes the refrigeration current range, the freezing current range and the ambient current range; when the target current is in 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.

[0009] By adopting the above technical solution, the refrigeration current, freezing current and ambient current corresponding to the first sensor, the second sensor and the third sensor are obtained, and compared with the preset refrigeration current interval, freezing current interval and ambient current interval. When the sensor is working normally, the corresponding current should be within the preset current interval. Only when the target current is in the preset current interval, the judgment between the target temperature and the preset temperature, and the ambient temperature and the preset ambient temperature is continued. Because the monitored temperature data is unreliable when the target sensor current is abnormal, the target sensor current is first verified to screen out valid temperature data, thereby avoiding erroneous temperature judgments caused by sensor failure and improving the accuracy and reliability of subsequent temperature control strategies.

[0010] Optionally, after determining whether the target current is in a preset current range, the method also includes: when the target current is not in the preset current range, determining that the target sensor is in a fault state; determining to generate a preset protection mode based on 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-type damping air door according to a first cycle, and the first cycle 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 cycle, and the second cycle 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.

[0011] By adopting the above technical solution, when the target current is not within the preset current range, the target sensor is determined to be in a fault state, and corresponding preset protection modes are generated for different sensor faults. The preset protection modes provide a temporary operating solution for the vehicle refrigerator in the event of a sensor failure. When the first sensor fails, a first processing method is adopted, namely, the stepped damping damper is periodically opened and closed according to a first cycle. This periodic control ensures that cooling continues to flow between the refrigerator and freezer compartments to a certain extent, maintaining the basic cooling function of the vehicle refrigerator. When the second sensor fails, a second processing method is adopted, and the compressor is turned on and off according to a second cycle. By properly controlling its operating cycle, the compressor can be prevented from over-operating when the sensor failure makes it impossible to accurately determine the freezer compartment temperature, thereby avoiding damage to the compressor due to prolonged high-load operation. When the third sensor fails, a third processing method is adopted, and the third sensor is set to a fixed ambient temperature, providing a relatively stable ambient temperature reference value, avoiding misjudgment of the external temperature due to sensor failure, which could affect the entire cooling control strategy.

[0012] Optionally, after the target current is in a preset current range, the method further includes: determining 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 lower than the preset second freezing temperature, determining to turn off the compressor.

[0013] By adopting the above technical solution, 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 freezer 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 and circulates it in the system, absorbing heat from the freezer and discharging it to the outside, thereby lowering the temperature of the freezer. When the freezing temperature is lower than the preset second freezing temperature, it means that the freezer temperature is already lower than the ideal temperature. At this time, the compressor is turned off and the refrigeration process is stopped. This can prevent the freezer temperature from being too low, avoid energy waste due to over-refrigeration, and also protect the items in the freezer from being over-frozen or damaged due to the low temperature.

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

[0015] By adopting the above technical solution, after the compressor's cumulative operation reaches the preset operating time, frost is likely to form on the evaporator surface. The accumulation of frost will hinder the heat exchange between the refrigerant and the evaporator, reducing the cooling efficiency. By obtaining the first operating time of the compressor and further determining the first temperature inside the vehicle refrigerator when the first operating time is greater than or equal to the preset first operating time, the heater is activated for defrosting when the first temperature is less than or equal to the preset first defrost temperature. If the heater is activated for defrosting based solely on the compressor's operating time without considering the actual temperature inside the refrigerator, it may cause the heater to operate when defrosting is not necessary, resulting in energy waste. After determining that the compressor operating time has reached the preset value, it is also necessary to determine whether the temperature inside the refrigerator is less than or equal to the preset first defrost temperature. The heater is activated only when both conditions are met, avoiding unnecessary defrosting operations.

[0016] Optionally, when the first temperature is less than or equal to the preset first defrost temperature, it is determined to start the heater so that the heater can defrost the vehicle refrigerator. The method also includes: obtaining the second temperature and the second operating time at a preset time interval, where the second operating time is the total time the heater is heated, and the second temperature is the temperature corresponding to the fourth sensor; judging whether the second temperature is greater than the preset second defrost temperature, or whether the second operating time is greater than or equal to the preset second operating time; when the second temperature is greater than the preset second defrost temperature, or the second operating time is greater than or equal to the preset second operating time, determining to turn off the heater and prohibiting the compressor or the step-type damping damper from being turned on within the preset time.

[0017] By adopting the above technical solution, during the defrost operation, the heater obtains a second temperature corresponding to the fourth sensor and a second operating time of the heater at preset intervals. Whether to shut down the heater is determined by determining whether the second temperature is greater than the preset second defrost temperature or whether the second operating time is greater than or equal to the preset time. If the second temperature reaches the preset second defrost temperature, the frost layer has essentially melted, and the defrost purpose has been achieved. If the second operating time reaches the preset time, even if the temperature is not fully reached, the safety hazards associated with prolonged heater operation can be avoided. Turning off the heater at this time ensures that the defrost operation is completed effectively and safely. Because the heater raises the internal temperature of the refrigerator during the defrost process, immediately turning on the compressor or step-type damper for cooling would cause a sudden increase in the refrigeration system load, affecting the cooling effect and system stability. By setting a prohibited activation time period, i.e., prohibiting the activation of the compressor or step-type damper for a preset time period, the refrigeration system can operate under more stable conditions, improving cooling efficiency and reducing energy consumption. This also reduces component wear and the probability of failure caused by sudden changes in system load. Optionally, when the first temperature is less than or equal to the preset first defrost temperature, it is determined to start the heater so that the heater performs a defrost operation on the vehicle refrigerator. The method also includes: determining that the vehicle refrigerator is in a defrost operation, generating a closing instruction according to the defrost operation, so as to close the step-type damping air door according to the closing instruction.

[0018] By adopting the above technical solution, during the defrost operation, the heater operates to raise the temperature inside the vehicle refrigerator to melt the frost layer. If the step-type damper is open, heat inside the refrigerator is exchanged with the outside air through the damper, causing heat loss. Generating a close command in response to the defrost operation and closing the step-type damper effectively reduces heat loss and allows the heat generated by the heater to be more concentratedly used for defrosting. Furthermore, when the step-type damper is closed, the interior of the vehicle refrigerator forms a relatively closed space, allowing the heat generated by the heater to circulate and distribute more effectively within this space, ensuring that all parts of the frost layer are evenly heated, thereby more thoroughly melting the frost layer.

[0019] In a second aspect of the present application, a control system for a vehicle refrigerator is provided, the system comprising an acquisition unit, a processing unit, and an adjustment unit; the acquisition unit determines whether the vehicle refrigerator is in a power-on state and acquires a target temperature and an ambient temperature corresponding to the vehicle refrigerator, the target temperature including 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 temperatures including 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 damper is opened; the target temperature and the preset temperature are calculated to obtain a temperature deviation, the temperature deviation including a refrigeration temperature deviation and a freezing temperature deviation; the temperature deviation is determined to be greater than a preset threshold value, the preset threshold value including a preset refrigeration threshold value and a preset freezing threshold value; when the temperature deviation is greater than the preset threshold value, a first opening is determined according to the temperature deviation; the adjustment unit generates an adjustment instruction based on the first opening, and controls the step-type damping damper to adjust from the second opening to the first opening according to the adjustment instruction, so that the step-type damping damper controls the cooling capacity of the vehicle refrigerator according to the first opening, the second opening being the initial opening of the step-type damping damper.

[0020] In a third aspect of the present application, an electronic device is provided, which 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, and the processor is used to execute the instructions stored in the memory, so that an electronic device executes any one of the methods described above in the present application.

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

[0023] 1. First, the target temperature and 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, the step-type damping damper is opened. Since the target temperature includes the refrigeration temperature and the freezing temperature, the solenoid valve control method often regulates the refrigerator and freezer compartments as a whole and cannot perceive the independent temperature changes of the two temperature zones. By independently monitoring the temperatures of the two temperature zones, the actual temperature state of each temperature zone can be accurately understood. The obtained target temperature is compared with the corresponding preset temperature to calculate the temperature deviation. The temperature deviation is then compared with a preset threshold. When the temperature deviation exceeds the preset threshold, the first opening of the step-type damping damper is determined based on the temperature deviation. The adjustment range of the step-type damping damper opening is determined based on the first opening. The step-type damping damper can dynamically adjust the damper opening based on the real-time monitored temperature deviation, thereby dynamically adjusting the refrigerant distribution ratio between the refrigerator and freezer compartments. This dynamic adjustment mechanism can keep the temperature in the vehicle refrigerator within a relatively stable range, improving the cooling effect and energy efficiency, and solving the problem that the solenoid valve on-off control cannot achieve dynamic cooling capacity distribution.

[0024] 2. Obtain the refrigeration current, freezing current and ambient current corresponding to the first sensor, the second sensor and the third sensor, and compare them with the preset refrigeration current interval, freezing current interval and ambient current interval. When the sensor is working normally, the corresponding current should be within the preset current interval. Only when the target current is in the preset current interval, the target temperature and the preset temperature, as well as the ambient temperature and the preset ambient temperature, are judged. Because the monitored temperature data is unreliable when the target sensor current is abnormal, the target sensor current is first verified to screen out valid temperature data, thereby avoiding erroneous temperature judgments caused by sensor failure and improving the accuracy and reliability of subsequent temperature control strategies. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a first flow chart of a method for controlling a vehicle refrigerator provided by an embodiment of the present application;

[0026] Figure 2 This is a first structural diagram of a control method for a vehicle refrigerator provided by an embodiment of the present application;

[0027] Figure 3 This is a second structural diagram of a control method for a vehicle refrigerator provided by an embodiment of the present application;

[0028] Figure 4 This is a second flow chart of a method for controlling a vehicle refrigerator provided by an embodiment of the present application;

[0029] Figure 5This is a third flow chart of a method for controlling a vehicle refrigerator provided by an embodiment of the present application;

[0030] Figure 6 This is a structural diagram of a control system for a vehicle refrigerator provided in an embodiment of the present application;

[0031] Figure 7 This is a structural diagram of an electronic device disclosed in an embodiment of the present application.

[0032] Explanation of the 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 DESCRIPTION

[0033] 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 drawings in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments.

[0034] In the description of the embodiments of this application, words such as "for example" or "for instance" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as "for example" or "for instance" in the embodiments of this application should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "for example" or "for instance" is intended to present the relevant concepts in a concrete manner.

[0035] In the description of the embodiments of the present application, the term "multiple" means two or more. For example, multiple systems refer to two or more systems, and multiple screen terminals refer to two or more screen terminals. In addition, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized.

[0036] The birth of car refrigerators has brought great convenience to people's lives. When the interior of the car refrigerator is cooled by a compressor and refrigerant, the car refrigerator is usually equipped with a refrigerator compartment and a freezer compartment. At present, a solenoid valve control method is used to control the flow of refrigerant. However, the solenoid valve control method often adjusts the refrigerator compartment and the freezer compartment as a whole, and cannot sense the independent temperature changes of the two temperature zones. As a result, it is impossible to finely distribute the cooling capacity according to the temperature requirements of the two temperature zones, which in turn affects the overall cooling effect. Therefore, how to solve the problems caused by the solenoid valve drive switch control method. A control method for a car refrigerator provided in an embodiment of the present application is applied to a power board. Figure 1 This is a first flow chart of a control method for a vehicle refrigerator provided by an embodiment of the present application.

[0037] refer to Figure 1 The method includes the following steps S101-S107.

[0038] S101: Determine whether the vehicle refrigerator is powered on, and obtain a target temperature and an ambient temperature corresponding to the vehicle refrigerator. The target temperature includes a refrigeration temperature and a freezing temperature.

[0039] In S101 above, a vehicle refrigerator is typically equipped with a power detection module that monitors the refrigerator's power connection status in real time. When the refrigerator is properly connected to an external power source (e.g., a vehicle power supply, a DC 12V power supply, etc.) and the power monitoring module receives a stable voltage signal, it determines that the refrigerator is powered on. For example, in a vehicle, when the vehicle is started and the onboard voltage supplies power to the refrigerator, the power detection module detects that the voltage is within the normal operating range (e.g., 12V) and sends a power-on signal to the refrigerator's power board, indicating that the refrigerator is powered on. In this case, the power board refers to the refrigerator's main control system.

[0040] In addition, since the hardware of the car 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 stepping motor module, a fan module, a door switch module, a lighting module, a defrost sensor, a freezing sensor, a lower refrigeration sensor, an upper refrigeration sensor, and an ambient temperature sensor. The display board and the power supply board communicate with each other 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, and the power supply board outputs instructions to these modules so that these modules perform corresponding operations according to the output instructions; the defrost sensor, the freezing sensor, the lower refrigeration sensor, the upper refrigeration sensor, and the ambient temperature sensor are all connected to the power supply board, and detection data is input to the power supply board for processing; the compressor module, the damper stepping motor module, and the fan module are all connected to the power supply board, and can receive output instructions from the power supply board for control, and can also input detection data to the power supply board. The power detection module operates within a wide input voltage range of 8.5V-32V. The power board detects temperature, door status, power supply voltage, and other conditions to control the compressor, step-type damper, fan, and lighting, maintaining the refrigerator and freezer temperatures within a specified range to preserve food. The defrost sensor is installed in frost-prone areas inside the car refrigerator. The upper and lower refrigeration sensors are installed in the refrigerator compartment. The freezer sensor is installed in the freezer compartment. The ambient temperature sensor is installed on the outside of the car refrigerator. The damper heating module is driven by a stepper motor, and the damper stepper motor module is driven by a stepper motor. The door switch module detects the opening and closing of the car refrigerator door. If the door is left open for an extended period or not closed properly, a buzzer alarm is triggered.

[0041] Furthermore, after the temperature sensors are installed inside and outside the vehicle refrigerator, the temperature sensors are Figure 2The refrigeration sensor, lower refrigeration sensor, upper refrigeration sensor, and ambient temperature sensor mentioned above are used to collect temperature signals for the refrigerated storage, frozen storage, and ambient temperatures in real time using temperature sensors. Since the monitoring cycle is set frequently, such as once per second, multiple temperature signals can be collected in real time to ensure the validity of the sampled temperatures. To remove jitter interference during the sampling process, a median filter algorithm is used. After five consecutive samplings, the median value is taken as the valid temperature value. For example, for freezer temperature collection, five consecutive samplings of multiple frozen sub-temperatures corresponding to the freezer compartment are performed. These sub-temperatures are then sent to the power board. After receiving these sub-temperatures, the power board selects the median value as the frozen storage temperature. The ambient and frozen storage temperatures are then acquired using the same method as described above for freezer temperature collection. In this case, the frozen storage, refrigerated storage, and ambient temperatures are all processed using the median filter algorithm. After the power board obtains the target temperature and ambient temperature, the target temperature now includes both the refrigerated storage temperature and the frozen storage temperature.

[0042] For example, the temperature of the cold storage room is collected in real time, and the cold storage sub-temperatures obtained five times in a row are 2°C, 3°C, 5°C, 6°C and 9°C. The middle value of 5°C is selected as the cold storage temperature for output.

[0043] In one possible implementation, when using a temperature sensor to collect the temperature of a vehicle refrigerator, it is also necessary to perform fault detection on the temperature sensor, and by real-time monitoring of the current of the temperature sensor, ensure that the temperature sensor can perform temperature monitoring normally, specifically including: obtaining a target current corresponding to the target sensor, the target sensor including a first sensor, a second sensor, and a third sensor, the target current including a refrigeration current, a freezing current, and an ambient current, the refrigeration current being the current corresponding to the first sensor installed in the refrigeration compartment, the freezing current being the current corresponding to the second sensor installed in the freezer compartment, and the ambient current being the current corresponding to the third sensor installed outside the vehicle refrigerator; judging whether the target current is in a preset current range, the preset current range including a refrigeration current range, a freezing current range, and an ambient current range; when the target current is in 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.

[0044] Specifically, the target current corresponding to the target sensors is obtained. The target sensors include a first sensor, a second sensor, and a third sensor. In this case, the target sensors can be understood as temperature sensors. The first sensor is installed in the refrigerator compartment of the vehicle refrigerator and is equipped with a current sensor. The current sensor monitors the operating current of electrical components related to the refrigerator compartment (such as the compressor and fan motor of the refrigerator compartment's refrigeration system) in real time and outputs the current data as an electrical signal. The second sensor and its associated current sensor are installed in the freezer compartment to monitor the operating current of electrical components related to the freezer compartment (such as the compressor and fan motor of the freezer compartment's refrigeration system). The third sensor and its associated current sensor are installed outside the vehicle refrigerator. This sensor may monitor the operating current of devices related to external environmental sensing (such as the power supply current of the ambient temperature sensor itself). Each current sensor converts the monitored current analog signal into a digital signal, which is then transmitted to the refrigerator's power board via a data bus. The power board receives, stores, and processes these digital signals. After obtaining the target current, the target current is compared with preset current ranges, including the refrigeration current range, the freezing current range, and the ambient current range. The setting of the preset current interval is based on a comprehensive consideration of factors such as the normal operating range of the sensor, the rated current of the electrical components, and the safety operation requirements. The obtained refrigeration current, freezing current, and ambient current are compared with the corresponding preset current intervals respectively. If the target current is within the preset current interval, it is considered that the current is within the normal range; if the current value exceeds the preset interval, it is considered that the current is abnormal. When it is determined that the refrigeration current, freezing current, and ambient current are all within the corresponding preset current intervals, it is considered that the target sensors are all in normal working condition, that is, the temperature data collected by the default target sensor is valid, so the temperature collected by the target sensor can be subsequently judged to provide an accurate temperature basis for subsequent refrigeration control, so as to avoid the collected temperature being incorrect due to a malfunction of the target sensor, which affects the subsequent judgment.

[0045] For example, in the refrigerator, when the compressor related to refrigeration is working, the current sensor detects that its working current is 2.5A. At this time, the refrigeration current is 2.5A. The refrigeration current range can be set to 2A-3A. The refrigeration temperature 2.5A is within the refrigeration current range, so the refrigeration current is in the preset current range; in the freezer, when the freezer fan motor is working, the current sensor detects that its working current is 1.2A. At this time, the freezing current is 1.2A. The freezing current range can be set to 1A-1.5A. The freezing current 1.2A is within the freezing current range, so the freezing current is in the preset current range; when the ambient temperature sensor outside the car refrigerator is working, the current sensor detects that its working current is 0.3A. At this time, the ambient current is 0.3A. The ambient current range can be set to 0.2A-0.4A. The ambient current 0.3A is within the ambient current range, so the ambient current is in the preset current range.

[0046] Further, when the target current is not in the preset current range, it is determined that the target sensor is in a fault state; a preset protection mode is generated based on the fault state, and 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 cycle, and the first cycle 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 cycle, and the second cycle 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.

[0047] Specifically, the power board continuously monitors current data from the first, second, and third sensors. Each new set of current data is immediately compared against the corresponding preset current range. Pre-set fault detection logic ensures that if a sensor's current data exceeds the preset range, the sensor is immediately flagged as faulty. Fault conditions include open circuit, short circuit, and other abnormalities. The power board also records information such as the time of the fault, sensor type, and abnormal current value for subsequent analysis and repair. Upon determining a sensor fault, the power board automatically matches the corresponding preset protection mode based on the faulty sensor type (first, second, or third). This matching relationship is pre-programmed into the power board during the refrigerator's design phase. The power board stores a mapping table that maps the first, second, and third sensors to the first, second, and third processing methods, respectively. When a first sensor fault is detected, the first processing method is determined from the mapping table. When a second sensor fault is detected, the second processing method is used. When a third sensor fault is detected, the third processing method is used. The first sensor is a refrigeration sensor. When the first sensor is faulty, the preset protection mode is the first response mode, which performs a first opening control and a first closing control on the step-type damping damper according to a first cycle. The first cycle consists of a first duration for the first opening control and a second duration corresponding to the first closing control. The first duration, second duration, and first cycle are determined based on the characteristics of the vehicle refrigerator's refrigeration system and safety requirements, and are determined through experimentation and optimization. For example, the first cycle is set to 30 minutes, with the first opening control duration being 10 minutes and the second closing control duration being 20 minutes. The step-type damping damper's motor is controlled by a drive circuit to open and close according to the set first cycle. During the 10 minutes of opening, the step-type damping damper opens to a certain degree, allowing cold air to enter the refrigerator compartment. During the 20 minutes of closing, the step-type damping damper closes, reducing cold air intake. Faults are classified by level; in this case, the sensor fault is classified as intermediate. Figure 4 shown.

[0048] When the first sensor is determined to be faulty, the step-type damper is controlled to operate according to a first cycle to ensure the vehicle refrigerator's basic cooling function is not affected. The second sensor is a freezer sensor. When the second sensor is faulty, the preset protection mode is the second response method, which involves performing a second on-control and a second off-control on the compressor according to a second cycle. The second cycle includes a third duration for the second on-control and a fourth duration for the second off-control. The third and fourth durations, along with the second cycle, are designed to ensure the compressor operates normally without damage from prolonged operation when the second sensor fails. For example, the first cycle is set to 30 minutes, with the third duration for the second on-control being 10 minutes and the fourth duration for the second off-control being 20 minutes. The compressor is turned on and off according to the set second cycle by controlling the relay or inverter. During the 10 minutes of on-control, the compressor operates in cooling mode; during the 20 minutes of off-control, the compressor stops. The compressor is controlled according to the second cycle (30 minutes: 10 minutes on, 20 minutes off). During the first 30-minute cycle, the compressor runs for the first minute and stops for the next 20 minutes. This process then repeats for the next 30-minute cycle, ensuring the freezer compartment maintains a certain cooling effect even if the second sensor fails, while also protecting the compressor. The third sensor is an ambient sensor. When the third sensor fails, the preset protection mode is the third processing mode, which sets the third sensor's temperature to a fixed ambient temperature. The fixed ambient temperature is a preset safety value, typically set based on the refrigerator's normal operating ambient temperature range and the refrigeration system's performance requirements. For example, the fixed ambient temperature is set to 25°C. This fixed ambient temperature value is used in subsequent temperature control logic to replace the actual ambient temperature value monitored by the third sensor for calculations and judgments. For example, when determining whether to open the step damper or adjust the compressor's operating status, 25°C is used as a reference for the ambient temperature. This embodiment adds fault tolerance. When a target sensor fails, the corresponding preset protection mode is automatically matched based on the sensor type, causing the step damper and compressor to cycle according to the preset processing mode, and then retrieving the fixed ambient temperature as the actual temperature value monitored by the third sensor.

[0049] like Figure 3As shown, the display board is connected to the power board via UART communication. The power board uses the sensor module to collect temperature data and then monitors the sensors, motor, door, voltage, and communication in the car refrigerator in real time. Once a fault is detected, the exception handling module can invoke the corresponding action. The driver module adjusts the damper based on 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 sensing to detect user clicks on the capacitive sensing buttons and then determines the corresponding function. The touch button detection module includes multiple buttons, and the compensation capacitor can be set to 6.8nF, with sensitivity adjustable according to actual conditions. The buzzer control module uses PWM square wave control with a 50% duty cycle and a pulse width of 4000. It emits different buzzer tones depending on the current state of the car refrigerator. The digital tube display module uses a two-digit digital tube display controlled by a bit select + segment select mode. The bit select is active high and the segment select is active low. The display content varies depending on the operating state of the car refrigerator. In addition to being connected to the power board through the UART communication protocol, the UART communication protocol can also be replaced by the CAN bus protocol.

[0050] S102: Determine 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.

[0051] In the above S102, when it is determined that the target sensor is not in a 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 preset.

[0052] The preset temperatures include a preset refrigeration temperature and a 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-type damping damper. The preset ambient temperature is also the ambient value used to determine whether to open the step-type damping damper. For example, the preset refrigeration temperature can be set to 8°C, the preset first freezing temperature to -3°C, and the preset ambient temperature 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 refrigerator, and are not further limited here.

[0053] S103: 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.

[0054] In S103 above, when the target temperature is greater than the preset temperature and the ambient temperature is greater than the preset ambient temperature, that is, 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 met the opening conditions for the step-type damping damper, and an opening instruction is sent to the drive motor of the step-type damping damper. Upon receiving the instruction, the drive circuit controls the motor of the step-type damping damper to rotate, thereby opening the damper. If either the target temperature or the ambient temperature is less than or equal to the preset temperature or the preset ambient temperature, it is determined that the vehicle refrigerator has not yet met the opening conditions for the step-type damping damper, and the temperature of the vehicle refrigerator continues to be monitored.

[0055] 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 temperature sensor detects a refrigeration temperature of 11°C, a freezing temperature of 0°C, and an ambient temperature of 38°C. In this case, 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 command is sent to the step-type damping damper in the refrigeration compartment, causing it to open.

[0056] After determining to open the stepped damper, the freezing temperature of the vehicle refrigerator's freezer compartment is analyzed to determine whether to activate the compressor. This involves determining whether the freezing temperature is greater than a preset second freezing temperature; activating the compressor when the freezing temperature is greater than the preset second freezing temperature; and deactivating the compressor when the freezing temperature is less than the preset second freezing temperature. Specifically, a freezing sensor is installed in the vehicle refrigerator's freezer compartment. This sensor monitors the freezer compartment temperature in real time and converts the temperature into a freezing temperature value. The freezing temperature is then compared with a preset second freezing temperature, which is set based on factors such as the vehicle refrigerator's design requirements, user habits, and the storage requirements for frozen items. When the freezing temperature is greater than the preset second freezing temperature, the compressor activation conditions are determined to be met. If the freezing temperature is higher than the preset second freezing temperature, the freezer compartment temperature is considered insufficient, and the compressor needs to be activated to cool the freezer compartment. A start signal is then sent to the compressor's control circuit. This start signal is typically a level signal or a pulse signal. Upon receiving the start signal, the compressor's control circuit connects power to the compressor, causing it to begin operating. For example, if the freezer temperature is -5°C and the preset second freezing temperature is -10°C, a start signal is sent to the compressor. Upon receiving the start signal, the compressor powers on and begins operating to cool the freezer compartment. When the freezer temperature falls below the preset second freezing temperature, the compressor shutdown conditions are determined to have been met. Because the freezer compartment temperature is now below the preset second freezing temperature, the freezer compartment is cold enough and no longer requires the compressor to cool, preventing damage to frozen items or wasting energy due to excessively low temperatures. A shutdown signal is sent to the compressor control circuit. This shutdown signal, which is the opposite of the start signal, may be a low-level signal. Upon receiving the shutdown signal, the compressor control circuit disconnects power to the compressor, causing it to stop operating. For example, if the freezer temperature is -12°C and the preset second freezing temperature is -10°C, a shutdown signal is sent to the compressor. Upon receiving the shutdown signal, the compressor control circuit disconnects power to the compressor, causing it to stop operating. The freezer compartment temperature will gradually rise until the conditions for restarting the compressor are met again. In actual applications, turning on or off the compressor is not just a matter of judging the freezing temperature, but also requires comprehensive consideration of other factors, which are not limited here. Figure 4 shown.

[0057] Furthermore, when it is determined that the compressor is to be turned on, the startup of the compressor must be monitored to determine whether the compressor has failed to start. After receiving the startup 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 time period, it is assumed that the compressor has failed to start. At this time, the fourth processing method is queried based on the failure of the compressor to start. The fourth processing method is to display the 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 time period, it is assumed that the compressor has started successfully, and the compressor can be used normally to cool the car refrigerator. The faults are classified into levels, and the failure to start the compressor is classified as a medium fault level.

[0058] In one possible embodiment, after the car refrigerator enters the use stage, it is necessary to monitor the cumulative operating time of the compressor and the temperature of the defrost sensor in the car refrigerator, and then judge the monitored operating time and the temperature monitored by the defrost sensor, and determine whether a defrost operation is needed based on the judgment result, so as to effectively prevent excessive accumulation of frost and ensure the refrigeration efficiency and normal operation of the car refrigerator, specifically including: obtaining a first operating time, the first operating time is the total cumulative working time of the compressor; judging whether the first operating time is greater than or equal to the preset first operating time; when the first operating time is greater than or equal to the preset first operating time, obtaining a first temperature monitored by a fourth sensor, 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 defrost temperature; when the first temperature is less than or equal to the preset first defrost temperature, determining to start the heater so that the heater performs a defrost operation on the car refrigerator.

[0059] Specifically, the compressor's operating status is continuously monitored. Typically, the compressor's operating status can be obtained through its power control signal or operating feedback signal. For example, when the compressor starts, a flag is recorded to indicate that the compressor is running; when the compressor stops, the flag is cleared. A timer or counter is internal to the power board to record the compressor's cumulative operating time. Whenever the compressor is running, the timer increments at regular intervals (e.g., every minute), thereby accumulating the total compressor operating time, known as the first operating time. The compressor's operating time is continuously recorded from the time the compressor is put into operation. For example, if the total historical operating time is 2100 minutes and the most recent three operating times are 50 minutes, 60 minutes, and 80 minutes, the cumulative compressor operating time is 2100 + 50 + 60 + 80 = 2290 minutes (38 hours and 10 minutes). The first operating time is then compared with a preset first operating time, which is set based on factors such as the vehicle refrigerator's refrigeration system characteristics, operating environment, and defrosting requirements. Typically, the preset first operating time is based on experience or experimental data to ensure that after the compressor has run for a sufficient period of time, a certain amount of frost will accumulate on the evaporator, necessitating defrost. For example, the preset first operating time can be set to 38 hours, indicating that defrost may be required after the compressor has run for 38 hours. When the first operating time is greater than or equal to the preset first operating time, a first temperature corresponding to a fourth sensor is acquired. The fourth sensor is installed in an area prone to frost formation inside the vehicle refrigerator, typically near the evaporator, and is used to monitor the surface temperature of the evaporator. The first temperature detected by the fourth sensor reflects frost accumulation. The fourth sensor monitors the temperature in real time and outputs the detected temperature as the first temperature. A determination is then made as to whether the first temperature is less than or equal to a preset first defrost temperature. The preset first defrost temperature is set based on the normal frost-free temperature inside the vehicle refrigerator and the temperature threshold at which frost begins to accumulate. If the first temperature is less than or equal to the preset first defrost temperature, the heater activation conditions are determined to be met. This is because the evaporator surface temperature is sufficiently low, indicating that frost may have accumulated to the point where defrost is necessary. An activation signal is then sent to the heater control circuit. This activation signal is typically a level signal or a pulse signal. After receiving the start signal, the heater control circuit will turn on the power of the heater and start the heater to work. After the heater starts, it will continue to monitor the defrost process. Figure 5 shown.

[0060] In the above example, it is determined that the first operating time is 38 hours and 10 minutes, and the preset first operating time is 38 hours. The first operating time is greater than the preset operating time. Then, the first temperature corresponding to the fourth sensor is obtained. The first temperature is -2°C, and the preset first defrost temperature is set to 3°C. When the first temperature is lower than the preset first defrost temperature, it is determined that the frost in the vehicle refrigerator may have accumulated to the extent that defrosting is required, so the heater needs to be started to perform the defrost operation.

[0061] In addition, when the first operating time is less than the preset first operating time, or the first temperature is greater than the preset defrost temperature, it is assumed that the start conditions for the defrost operation have not been met inside the vehicle refrigerator, so the operating time of the compressor and the temperature of the fourth sensor are continuously monitored. Once the first operating time is greater than or equal to the preset first operating time, and the first temperature is less than or equal to the preset defrost temperature, the vehicle refrigerator can be defrosted.

[0062] Furthermore, while starting the heater to perform defrosting operations on the interior of the vehicle refrigerator, the defrosting process is accurately monitored, and the heater is turned off in time after the defrosting is completed, and the compressor or the step-type damping damper is prohibited from being turned on for a certain period of time to ensure the defrosting effect and the stable operation of the vehicle refrigerator. Specifically, the process includes: obtaining a second temperature and a second operating time at a preset interval, where the second operating time is the total time the heater is heated, and the second temperature is the temperature corresponding to the fourth sensor; judging whether the second temperature is greater than the preset second defrost temperature, or whether the second operating time is greater than or equal to the preset second operating time; when the second temperature is greater than the preset second defrost temperature, or the second operating time is greater than or equal to the preset second operating time, determining to turn off the heater and prohibiting the compressor or the step-type damping damper from being turned on within the preset time.

[0063] Specifically, when the heater is activated for defrosting, a timer is triggered to begin timing. After a period of time, the fourth sensor's second temperature and the heater's second operating time are acquired. The fourth sensor continuously monitors the temperature inside the vehicle refrigerator and reads the current temperature, which is the second temperature. A counter is used to record the heater's operating time. When the heater is activated, the counter counts up, incrementing by 1 every time a certain time unit (e.g., 1 minute) elapses. When the timer is triggered, the current value of the counter is taken, which represents the total heating time of the heater, or the second operating time. For example, if the preset time interval is 45 minutes, the heater has already been operating for a period of time. When the timer reaches 45 minutes, the fourth sensor's temperature is read, indicating a second temperature of 9°C. Simultaneously, the counter is read, indicating a second operating time of 40 minutes. When determining whether the second temperature is greater than the preset second defrost temperature or whether the second operating time is greater than or equal to the preset second operating time, the preset second defrost temperature is set based on the temperature of the vehicle refrigerator's internal surfaces susceptible to frost formation upon completion of defrosting, and the preset operating time is determined based on factors such as the heater's power, the amount of heat required for defrosting, and safety requirements. As long as the second temperature is greater than the preset second defrost temperature, or the second operating time is greater than or equal to the preset second operating time, the condition for turning off the heater will be met.

[0064] For example, the preset second defrost temperature is 8°C, and the preset second operating duration is 40 minutes. The currently acquired second temperature is 9°C, and the second operating duration is 38 minutes. First, the second temperature (9°C > 8°C) is determined to be greater than 8°C, thus satisfying the condition. Although the second operating duration (38 minutes < 40 minutes) does not meet the second condition, the second temperature (greater than the preset second defrost temperature) is satisfied, so the overall judgment is that the heater shutdown condition is met. After determining that the heater shutdown condition is met, a shutdown signal is sent to the heater control circuit. This shutdown signal is typically a level signal or a pulse signal, the opposite of the start signal. Upon receiving the shutdown signal, the heater control circuit disconnects the heater power supply, causing it to stop operating. After confirming that the heater has stopped operating, a timer is started to prevent the compressor or step damper from turning on for a preset duration. During the preset duration, even if other conditions (such as temperature requirements) meet the compressor or step damper turning on requirements, the car refrigerator will refuse to send the start signal based on the timer status. The preset time can be set to 6 minutes, that is, the compressor or the step-type damping damper is not allowed to be opened within 6 minutes after the heater is turned off. The compressor or the step-type damping damper can be opened according to the actual situation only after the 6 minutes are completed.

[0065] Furthermore, the current value corresponding to the fourth sensor is acquired in real time and compared with a preset range. The preset range refers to the current range corresponding to the fourth sensor's normal operation. If the current value is outside the preset range, the fourth sensor is determined to be in a fault state. The processing method determined by the fourth sensor is to display a fault code and set the temperature monitored by the fourth sensor to 0°C. By superimposing and classifying the faults, the fourth sensor fault can be classified as a medium fault level. If the fourth sensor is determined to be faulty, the defrost process is automatically executed for a fixed duration of 40 minutes, and the number of abnormalities is recorded to adjust the subsequent defrost interval.

[0066] S104: Calculate the target temperature and the preset temperature to obtain a temperature deviation, where the temperature deviation includes a refrigeration temperature deviation and a freezing temperature deviation.

[0067] In the above S104, after determining to open the step-by-step damping air door, the target temperature and the preset temperature will be calculated to obtain the temperature deviation. The temperature deviation includes the refrigeration temperature deviation and the freezing temperature deviation. The refrigeration temperature deviation is calculated between the refrigeration temperature and the preset refrigeration temperature, and the freezing temperature deviation is calculated between the freezing temperature and the preset first freezing temperature.

[0068] For example, the preset refrigeration temperature is 8°C, the preset first freezing temperature is -3°C, the refrigeration temperature obtained by the temperature sensor is 11°C, and the freezing temperature is 0°C. At this time, the refrigeration temperature deviation is 3°C, and the freezing temperature deviation is -2°C.

[0069] S105: Determine whether the temperature deviation is greater than a preset threshold value, where the preset threshold value includes a preset refrigeration threshold value and a preset freezing threshold value.

[0070] In the above S105, after obtaining the temperature deviation, the temperature deviation is compared with the preset threshold value, which includes a preset refrigeration threshold value and a preset freezing threshold value. The preset refrigeration threshold value and the preset freezing threshold value are threshold values ​​set according to the adjustment of the damper of the vehicle refrigerator. The refrigeration temperature deviation is compared with the preset refrigeration threshold value, and the freezing temperature deviation is compared with the preset freezing threshold value. Only when the temperature deviation exceeds the preset threshold value will the adjustment of the damper opening be triggered. This avoids frequent operation of the damper due to slight temperature fluctuations, reduces energy waste and equipment wear caused by frequent adjustments, and also better ensures the stability of the cooling effect. For example, the preset refrigeration threshold value can be set to ±1°C, and the preset freezing threshold value can be set to ±1.5°C.

[0071] S106: When the temperature deviation is greater than a preset threshold, determining a first opening degree according to the temperature deviation.

[0072] In the above S106, when the temperature deviation is greater than the preset threshold, it is determined that the step-by-step damping damper needs to be adjusted, and the first opening is determined according to the temperature deviation. The temperature deviation is input into the preset opening library for query to obtain the first opening. The preset opening library is to dynamically bind the mechanical stroke of the step-by-step damping damper with the temperature deviation in advance, and then store the bound correspondence in the preset opening library, so that the corresponding mechanical stroke can be found in the preset opening library according to the temperature deviation, and then the damper opening is determined according to the mechanical stroke. Since the mechanical stroke of the step-by-step damping damper is 1850 steps, the 1850-step mechanical stroke is dynamically bound to the temperature deviation. This means that the opening of the damper is no longer limited to a few fixed gears, but can be continuously and dynamically adjusted according to the actual temperature deviation to achieve stepless regulation.

[0073] For example, the total mechanical travel of a stepped damper is 1850 steps, corresponding to the damper moving from fully closed (0 steps) to fully open (1850 steps). A larger damper opening allows more cooling capacity to pass through, while a smaller damper opening allows less cooling capacity to pass through. The number of steps and cooling capacity distribution can be linearly or nonlinearly related. The damper opening is adjusted based on a comparison of the temperature deviation with a preset refrigeration threshold. Based on experimental data, the number of steps increases by 50 for every 0.5°C increase in temperature deviation. For a refrigeration temperature deviation of 3°C, the damper opening is determined to correspond to 300 steps based on the refrigeration temperature deviation. This is the first opening, which refers to the damper adjustment corresponding to the refrigeration temperature deviation. For a freezing temperature deviation of -2°C, the damper opening is determined to correspond to 200 steps based on the freezing temperature deviation. This is the first opening, which refers to the damper adjustment corresponding to the freezing temperature deviation. In practical applications, cooling capacity and damper opening may be nonlinearly related, so the mapping relationship needs to be refined based on experimental data. In addition to pre-binding temperature deviation and mechanical stroke, hysteresis control algorithm and fuzzy PID composite control can also be used, where PID is used in the freezer and fuzzy control is used in the refrigerator, and the opening of the step-type damping damper can be dynamically adjusted.

[0074] S107: Generate an adjustment instruction based on the first opening, and control the step damping damper to adjust from the second opening to the first opening according to the adjustment instruction, so that the step damping damper controls the cooling capacity of the vehicle refrigerator according to the first opening, and the second opening is the initial opening of the step damping damper.

[0075] In the above S107, after generating an adjustment instruction based on the determined first opening, the adjustment instruction is sent to the driving motor of the stepping damping air door. After receiving the adjustment instruction, the driving motor will control the stepping motor to rotate the corresponding number of steps, thereby adjusting the air door from the current second opening to the first opening.

[0076] For example, if the initial opening (second opening) of a step-type damper damper for refrigeration is 100 steps, and the first opening is determined to be 300 steps based on the refrigeration temperature deviation, the drive circuit will control the motor to rotate and adjust the refrigeration damper opening from 100 steps to 300 steps. If the initial opening (second opening) of a step-type damper damper for freezing is 150 steps, and the first opening is determined to be 200 steps based on the freezing temperature deviation, the drive circuit will control the motor to rotate and adjust the freezing damper opening from 150 steps to 200 steps.

[0077] In addition, when the temperature deviation is less than the preset threshold, it is determined that there is no need to automatically adjust the damper of the car refrigerator at this time. Adjustment will only be performed when the temperature deviation is greater than the preset threshold, avoiding frequent movement of the damper due to slight temperature fluctuations.

[0078] In one possible implementation, while dynamically adjusting the opening of the stepping damper, the vehicle refrigerator can also be precisely controlled, achieving precise temperature control and improving temperature uniformity. The stepper motor drive in this embodiment utilizes a two-phase excitation (four-step) drive mode. Two-phase excitation is a stepper motor drive mode, where "four-step" refers to the four steps required to complete a full excitation cycle. In stepper motor drive, the excitation mode influences motor performance, such as accuracy and torque. Two-phase excitation can ensure smoother motor operation, reduce vibration and noise, and improve positioning accuracy. A predefined phase table is crucial for achieving precise stepper control. It stores a series of specific phase parameters that determine the excitation state of the stepper motor at different times. By energizing the motor windings sequentially according to the sequence in the phase table, the number of rotation steps and direction of the motor can be precisely controlled. The parameters of the stepper motor phase table can be determined through extensive experimentation and optimization. For example, the phase table parameters can be set to 0x09, 0x08, 0x0C, 0x04, 0x06, 0x02, 0x03, and 0x01. The specific excitation sequence can be adjusted based on the motor characteristics. Different stepper motors may have different electrical and mechanical characteristics, such as resistance, inductance, and step angle. Adjusting the excitation sequence based on the actual motor characteristics can further optimize motor performance and ensure precise step control on different motors. Each step corresponds to 11.25° of motor rotation. This means that each time the stepper motor receives a control pulse, it switches the excitation state according to the predefined phase table, resulting in an 11.25° rotation. The step damper moves approximately 0.05° per step. The motor is connected to the damper via a transmission mechanism (such as a gear or screw). Small rotations of the motor are converted by the transmission mechanism, causing the damper to move with high resolution (0.05° / step). This allows precise adjustment of the damper's opening, thereby precisely controlling the amount of cooling entering the refrigerator and keeping temperature fluctuations within ±0.5°C, significantly improving temperature uniformity. In one possible embodiment, when the vehicle refrigerator is determined to be in a defrosting operation, a "defrosting in progress" status can be displayed on the vehicle refrigerator's display panel. A closing command is generated based on the defrosting operation, and the step-type damper is closed based on the closing command. Accurately generating and controlling the closing of the step-type damper ensures a smooth defrosting process and prevents mixing of hot and cold air during the defrosting process, which could affect the defrosting effect and the refrigerator's cooling performance. The closing command can only be sent if the step-type damper is detected to be open. If the step-type damper is closed, no closing command is required. When a fault is detected in the fourth sensor, a closing command is also required to be sent to the step-type damping air door.

[0079] In a possible implementation, Figure 2 The fan module in the system monitors the current and then judges 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 exception handling method must be adopted. At this time, the first exception handling method means forced shutdown within 1 minute. The fan fault is classified as a severe fault level. The communication connection between the display panel and the power board can also be fault-checked. It can be specified that the signal sent by the display panel is received within a preset time. The preset time can be set to 20 minutes. If the signal sent by the display panel is not received within 20 minutes, it is confirmed that a communication fault exists. After determining that a communication fault exists, the second exception handling method is adopted. The second exception handling method is to display the fault code and classify the communication fault into a medium fault level. When the car refrigerator is in operation, the voltage of the car refrigerator is monitored in real time to determine 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 of the voltage maintenance is obtained. If the maintenance duration is greater than or equal to the preset third duration, it is assumed that there is a voltage fault in the car refrigerator. The third abnormal handling method is used according to the voltage fault. The third abnormal handling method refers to displaying the fault code and shutting down for protection. The voltage fault is divided into serious fault levels. For example, the low voltage can be set to 9V, the high voltage can be set to 17V, the voltage is 18V, the maintenance 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 maintenance duration is greater than the preset third duration. It is assumed that there is a voltage fault in the car refrigerator.

[0080] The embodiment of the present application also provides a control system for a vehicle refrigerator. Figure 6 This is a schematic diagram of the structure of a control system for a car refrigerator provided by an embodiment of the present application. Figure 6 The system includes an acquisition unit 601, a processing unit 602 and an adjustment unit 603.

[0081] The acquisition unit 601 determines that the vehicle refrigerator is powered on, and acquires a target temperature and an ambient temperature corresponding to the vehicle refrigerator, where the target temperature includes a refrigeration temperature and a freezing temperature.

[0082] The processing unit 602 determines 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 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-by-step damping air door is opened; the target temperature and the preset temperature are calculated to obtain a temperature deviation, the temperature deviation includes a refrigeration temperature deviation and a freezing temperature deviation; determines whether the temperature deviation is greater than a preset threshold, the preset threshold includes a preset refrigeration threshold and a preset freezing threshold; when the temperature deviation is greater than the preset threshold, the first opening is determined according to the temperature deviation.

[0083] The adjustment unit 603 generates an adjustment instruction based on the first opening, and controls the step-type damping damper to adjust from the second opening to the first opening according to the adjustment instruction, so that the step-type damping damper controls the cooling capacity of the vehicle refrigerator according to the first opening, and the second opening is the initial opening of the step-type damping damper.

[0084] In one possible embodiment, the acquisition unit 601 is used to obtain the target current corresponding to the target sensor, the target sensor includes a first sensor, a second sensor and a third sensor, 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 refrigeration chamber, the freezing current is the current corresponding to the second sensor installed in the freezer chamber, and the ambient current is the current corresponding to the third sensor installed outside the vehicle refrigerator; the processing unit 602 is used to determine whether the target current is in a preset current range, the preset current range includes a refrigeration current range, a freezing current range and an ambient current range; when the target current is in the preset current range, it is determined whether the target temperature is greater than the preset temperature, and whether the ambient temperature is greater than the preset ambient temperature.

[0085] In one possible embodiment, the processing unit 602 is used to determine that the target sensor is in a fault state when the target current is not in a preset current range; and to generate a preset protection mode based on 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-type damping air door according to a first cycle, and the first cycle 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 cycle, and the second cycle 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.

[0086] In one possible embodiment, the processing unit 602 is used 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, determine to start the compressor; when the freezing temperature is less than the preset second freezing temperature, determine to turn off the compressor.

[0087] In one possible embodiment, the acquisition unit 601 is used to obtain a first operating duration, which is the total accumulated working time of the compressor; the processing unit 602 is used to determine whether the first operating duration is greater than or equal to a preset first operating duration; the acquisition unit 601 is used to obtain a first temperature monitored by a fourth sensor when the first operating duration is greater than or equal to the preset first operating duration, and the fourth sensor is a sensor installed inside the vehicle refrigerator; the processing unit 602 is used to determine whether the first temperature is less than or equal to a preset first defrost temperature; when the first temperature is less than or equal to the preset first defrost temperature, it is determined to start the heater so that the heater performs a defrost operation on the vehicle refrigerator.

[0088] In one possible embodiment, the acquisition unit 601 is used to obtain the second temperature and the second operating time at intervals of a preset time, where the second operating time is the total time the heater is heating, and the second temperature is the temperature corresponding to the fourth sensor; the processing unit 602 is used to determine whether the second temperature is greater than the preset second defrost temperature, or whether the second operating time is greater than or equal to the preset second operating time; when the second temperature is greater than the preset second defrost temperature, or the second operating time is greater than or equal to the preset second operating time, it is determined to turn off the heater and prohibit turning on the compressor or the step-type damping damper within the preset time.

[0089] In a possible implementation, the regulating unit 603 is configured to determine that the vehicle refrigerator is in a defrosting operation, and generate a closing instruction according to the defrosting operation, so as to close the step-type damping door according to the closing instruction.

[0090] It should be noted that the above embodiments provide systems that implement their functions using only the division of the above functional modules as an example. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be 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 are based on the same concept. The specific implementation process is detailed in the method embodiment and will not be repeated here.

[0091] This application also discloses an electronic device. Figure 7 , Figure 7 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 .

[0092] The communication bus 705 is used to realize the connection and communication between these components.

[0093] The user interface 703 may include a display screen (Display) and a camera (Camera). Optionally, the user interface 703 may also include a standard wired interface and a wireless interface.

[0094] The network interface 704 may optionally include a standard wired interface or a wireless interface (such as a WI-FI interface).

[0095] The processor 701 may include one or more processing cores. Using various interfaces and circuits, the processor 701 connects to various components within the server. It executes instructions, programs, code sets, or instruction sets stored in the memory 702, as well as accesses data stored in the memory 702, to perform various server functions and process data. Optionally, the processor 701 may be implemented using at least one of the following hardware forms: a digital signal processing (DSP), a field-programmable gate array (FPGA), or a programmable logic array (PLA). The processor 701 may integrate one or a combination of a central processing unit (CPU), a graphics processing unit (GPU), and a modem. The CPU primarily processes the operating system, user interface, and application requests; the GPU is responsible for rendering and drawing content displayed on the display screen; and the modem handles wireless communications. It is understood that the modem may also be implemented independently of the processor 701 and implemented on a separate chip.

[0096] Memory 702 may include random access memory (RAM) or read-only memory (ROM). Optionally, memory 702 may include non-transitory computer-readable storage medium. Memory 702 may be used to store instructions, programs, code, code sets, or instruction sets. Memory 702 may include a program storage area and a data storage area. The program storage area may store instructions for implementing an operating system, instructions for at least one function (such as a touch function, sound playback function, image playback function, etc.), instructions for implementing the aforementioned method embodiments, and the data storage area may store data involved in the aforementioned method embodiments. Memory 702 may also optionally be at least one storage device located remotely from the aforementioned processor 701.

[0097] like Figure 7 As shown, 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 based on mobile phone-based temperature anomaly monitoring.

[0098] exist Figure 7 In the electronic device 700 shown, the user interface 703 is mainly used to provide an input interface for the user and obtain data input by the user; and the processor 701 can be used to call the application program for temperature anomaly monitoring based on the mobile phone stored in the memory 702. When executed by one or more processors, the electronic device executes one or more methods described in the above embodiments.

[0099] It should be noted that for the aforementioned method embodiments, for simplicity of description, they are all expressed as a series of action combinations, but those skilled in the art should be aware that this application is not limited by the order of the actions described, because according to this application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required for this application.

[0100] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0101] In the several embodiments provided in this application, it should be understood that the disclosed devices can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods, such as 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 mutual coupling or direct coupling or communication connection shown or discussed can be through some service interfaces, and the indirect coupling or communication connection of the devices or units can be electrical or other forms.

[0102] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0103] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0104] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable memory. Based on this understanding, the technical solution of this application, or the portion that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a memory and includes several instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of this application. The aforementioned memory includes various media that can store program code, such as USB flash drives, mobile hard drives, magnetic disks, or optical disks.

[0105] The above is only an exemplary embodiment of the present disclosure and cannot be used to limit the scope of the present disclosure. That is, any equivalent changes and modifications made according to the teachings of the present disclosure are still within the scope of the present disclosure. After considering the disclosure of the specification and the truth of practice, those skilled in the art will easily think of other embodiments of the present disclosure. This application is intended to cover any variation, use or adaptive change of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary technical means in the technical field not recorded in the present disclosure.

Claims

1. A control method for a vehicle refrigerator, characterized in that: The method comprises: Determine whether the vehicle refrigerator is powered on, obtain a target temperature and an ambient temperature corresponding to the vehicle refrigerator, the target temperature including a refrigeration temperature and a freezing temperature; after obtaining the target temperature and the ambient temperature corresponding to the vehicle refrigerator, the target temperature including a refrigeration temperature and a freezing temperature, the method further includes: obtaining a target current corresponding to a target sensor, the target sensor including a first sensor, a second sensor, and a third sensor, the target current including a refrigeration current, a freezing current, and an ambient current, the refrigeration current being the current corresponding to the first sensor installed in the refrigeration compartment, the freezing current being the current corresponding to the second sensor installed in the freezing compartment, and the ambient current being the current corresponding to the third sensor installed outside the vehicle refrigerator; determine whether the target current is within a preset current interval, the preset current interval including a refrigeration current interval, a freezing current interval, and an ambient current interval; when the target current is within the preset current interval, determine whether the target temperature is greater than a preset temperature, and whether the ambient temperature is greater than a preset ambient temperature; Determining whether the target temperature is greater than a preset temperature and whether the ambient temperature is greater than a preset ambient temperature, wherein 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, opening the step-type damping air door; Calculating the target temperature and the preset temperature to obtain a temperature deviation, wherein the temperature deviation includes a refrigeration temperature deviation and a freezing temperature deviation; Determining whether the temperature deviation is greater than a preset threshold, wherein 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; An adjustment instruction is generated based on the first opening, and the step-type damping damper is controlled to adjust from the second opening to the first opening according to the adjustment instruction, so that the step-type damping damper controls the cooling capacity of the vehicle refrigerator according to the first opening, and the second opening is the initial opening of the step-type damping damper.

2. The method according to claim 1, characterized in that After determining whether the target current is within a preset current range, the method further includes: When the target current is not within the preset current interval, determining that the target sensor is in a fault state; A preset protection mode is generated based on the fault state, and 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 cycle, and the first cycle 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 cycle, and the second cycle 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.

3. The method according to claim 1, characterized in that After the target current is within the preset current range, the method further includes: determining 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 lower than the preset second freezing temperature, it is determined to turn off the compressor.

4. The method according to claim 3, characterized in that After obtaining the target temperature and ambient temperature corresponding to the vehicle refrigerator, where the target temperature includes a refrigeration temperature and a freezing temperature, the method further includes: Acquire a first operating time, where the first operating time is the total cumulative operating time of the compressor; Determining whether the first running time is greater than or equal to a preset first running time; When the first operating time is greater than or equal to the preset first operating time, obtaining a first temperature monitored by a fourth sensor, where the fourth sensor is a sensor installed inside the vehicle refrigerator; determining whether the first temperature is less than or equal to a preset first defrost temperature; When the first temperature is less than or equal to the preset first defrosting temperature, it is determined to start the heater so that the heater performs a defrosting operation on the vehicle refrigerator.

5. The method according to claim 4, characterized in that After determining to start the heater when the first temperature is less than or equal to the preset first defrost temperature so that the heater performs a defrost operation on the vehicle refrigerator, the method further includes: At a preset time interval, a second temperature and a second operating time are obtained, where the second operating time is the total heating time of 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 defrost temperature, or whether the second operating time is greater than or equal to a preset second operating time; When the second temperature is greater than the preset second defrost temperature, or the second operating time is greater than or equal to the preset second operating time, it is determined to turn off the heater and prohibit turning on the compressor or the step damping door within a preset time.

6. The method according to claim 4, characterized in that After determining to start the heater when the first temperature is less than or equal to the preset first defrost temperature so that the heater performs a defrost operation on the vehicle refrigerator, the method further includes: It is determined that the vehicle refrigerator is in the defrost operation, and a closing instruction is generated according to the defrost operation, so as to close the step-type damping door according to the closing instruction.

7. A control system for a car refrigerator, characterized in that: The system executes the method according to any one of claims 1 to 6, and the system comprises an acquisition unit (601), a processing unit (602), and an adjustment unit (603); The acquisition unit (601) determines that the vehicle refrigerator is powered on, and acquires a target temperature and an ambient temperature corresponding to the vehicle refrigerator, wherein the target temperature includes a refrigeration temperature and a freezing temperature; After obtaining the target temperature and ambient temperature corresponding to the vehicle refrigerator, wherein the target temperature includes a refrigeration temperature and a freezing temperature, the method further includes: obtaining a target current corresponding to a target sensor, wherein 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, wherein the refrigeration current is a current corresponding to the first sensor installed in the refrigeration compartment, the freezing current is a current corresponding to the second sensor installed in the freezing compartment, and the ambient current is a current corresponding to the third sensor installed outside the vehicle refrigerator; judging whether the target current is within a preset current interval, wherein the preset current interval includes a refrigeration current interval, a freezing current interval, and an ambient current interval; and when the target current is within the preset current interval, judging whether the target temperature is greater than a preset temperature and whether the ambient temperature is greater than a preset ambient 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, wherein 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, opens the step-type damping air door; calculates the target temperature and the preset temperature to obtain a temperature deviation, wherein the temperature deviation includes a refrigeration temperature deviation and a freezing temperature deviation; determines whether the temperature deviation is greater than a preset threshold, wherein the preset threshold includes a preset refrigeration threshold and a preset freezing threshold; and when the temperature deviation is greater than the preset threshold, determines a first opening degree according to the temperature deviation; The regulating unit (603) generates a regulating instruction based on the first opening, and controls the step-type damping damper to adjust from the second opening to the first opening according to the regulating instruction, so that the step-type damping damper controls the cooling capacity of the vehicle refrigerator according to the first opening, and the second opening is the initial opening of the step-type damping damper.

8. An electronic device, characterized in that: The electronic device (700) comprises a processor (701), a memory (702), a user interface (703) and a network interface (704), wherein the memory (702) is used to store instructions, the user interface (703) and the network interface (704) are used to communicate with other devices, and 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 to 6.

9. 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 to 6 is executed.

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