Self-adaptive multi-power-supply vehicle-mounted refrigerator

Abstract

The invention discloses a self-adaptive multi-power-supply vehicle-mounted refrigerator, and relates to vehicle-mounted refrigerator power supply control, the key points of the technical scheme are that the self-adaptive multi-power-supply vehicle-mounted refrigerator comprises a box body, the box body is provided with a placing cavity for placing a compressor and a control module, and the control module comprises a power supply connecting module used for being connected with a low-voltage storage battery or a power supply to output a power supply voltage signal; and the direct-current voltage reduction module is connected with the battery connection module and used for converting the power supply to output driving voltage for driving the compressor when responding to power supply of the power supply. Stable work of the vehicle-mounted refrigerator can be guaranteed through power supply of the double power sources, the power source and the low-voltage storage battery supply power to the vehicle-mounted refrigerator in a self-adaptive mode, when the temperature rise rate of the vehicle-mounted refrigerator does not reach the standard, supplementation can be conducted through the power source, and therefore the requirement for electricity needed by vehicle running is met, and in the aspect of dynamic energy supplementation, the energy utilization rate of the vehicle is improved. The power supply proportion of the low-voltage storage battery and the power supply is dynamically adjusted by collecting and detecting the conditions of the heating rate and the temperature change delay.

Description

Technical Field

[0001] The present invention relates to the power supply control of a vehicle-mounted refrigerator, and more specifically, to an adaptive multi-power vehicle-mounted refrigerator. Background Art

[0002] A vehicle-mounted refrigerator refers to a refrigerated cabinet that can be carried in a vehicle. There are mainly two types of vehicle-mounted refrigerators on the market. One is a semiconductor vehicle-mounted refrigerator, whose principle is to refrigerate by an electronic chip; the other is a compressor vehicle-mounted refrigerator. The compressor is a traditional technology of traditional refrigerators, with a low refrigeration temperature, high refrigeration efficiency, the ability to make ice and preserve freshness, and a large volume.

[0003] In terms of the power supply method, the existing vehicle-mounted refrigerators adopt an external power supply method, that is, the vehicle-mounted refrigerator is connected through the vehicle cigarette lighter interface and powered by the engine or battery. This is the most widely used power supply method. This method requires the vehicle to be in a starting state. After the vehicle stalls, the vehicle-mounted refrigerator stops refrigerating. There is a short refrigeration maintenance time after power failure. For this reason, there are many researches on how to extend the refrigeration and heat preservation of the vehicle-mounted refrigerator after the vehicle stalls on the market. Subsequently, various methods such as directly powering by the battery of a new energy electric vehicle, connecting an external solar panel or a mobile power supply have emerged one after another.

[0004] Publication No. CN213027518U discloses a solar-powered vehicle-mounted refrigerator for a motorhome, which discloses a method of powering a vehicle-mounted refrigerator by using solar energy. However, the power supply method using solar energy is easily affected by the light conversion efficiency of the photovoltaic panel and the ambient light intensity and has fluctuations, so the power supply for the vehicle-mounted refrigerator is not stable; Publication No. CN117458655A discloses a vehicle-mounted refrigerator power supply control method, device, medium and vehicle, which discloses a method of dynamically determining the target power supply mode of a vehicle-mounted refrigerator according to the vehicle state information of the vehicle, and controlling the operation of the vehicle-mounted refrigerator according to the target power supply mode, so as to intelligently determine the power supply source of the vehicle-mounted refrigerator in different usage scenarios of the vehicle, avoid the same power source continuously powering the vehicle-mounted refrigerator and affecting the health of the power source, and be able to balance the power consumption of the vehicle-mounted refrigerator during operation and the power of each power source of the vehicle.

[0005] The above solution dynamically determines the power supply mode of the vehicle-mounted refrigerator according to the change of the vehicle state, so as to use the power source as the power supply source to power the vehicle-mounted refrigerator and charge the low-voltage battery when high power operation is required and the vehicle driving demand is guaranteed, and use the low-voltage battery for power supply in the heat preservation and off-vehicle modes.

[0006] However, for temperature judgment, when the opening and closing of the refrigerator door by the user causes the temperature to rise and fluctuate, the power supply mode frequently switches between the power supply modes of the power source and the low-voltage battery, affecting the service life of the low-voltage battery and the power source and the driving stability of the vehicle. And when in the off-vehicle mode (non-parking mode), the power supply of the in-vehicle refrigerator mainly depends on the user's preset settings. If the set duration is too long, it is easy to cause over-discharge of the power source or the low-voltage battery. If it is too short, it cannot meet the actual needs.

[0007] Therefore, a new solution is needed to solve this problem. Summary of the Invention

[0008] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide an adaptive multi-power supply in-vehicle refrigerator.

[0009] The above technical purpose of the present invention is achieved through the following technical solutions: an adaptive multi-power supply in-vehicle refrigerator, including a box body, on which there is a placement cavity for placing a compressor and a control module. The control module includes: A power connection module for connecting a low-voltage battery or a power source to output a power supply voltage signal; A DC buck module is connected to the power connection module and is used to convert the power source to output a driving voltage for driving the compressor when the power source supplies power. A power management control module is electrically connected to the power connection module and the DC buck module and is used to switch and coordinate the power supply modes of the low-voltage battery and the power source to the compressor: When there is a temperature difference between the actual temperature and the set temperature of the in-vehicle refrigerator, monitor the capacitance status of the power source and the low-voltage battery. If the capacitance of the low-voltage battery is greater than the preset threshold, the power management control module switches the low-voltage battery to supply power to the compressor and allocates the power source to dynamically supplement the power gap of the low-voltage battery.

[0010] The present invention is further provided as: the power management control module includes: A central controller is connected to the low-voltage battery and the power source, obtains the capacitance status of the low-voltage battery and the power source, and is electrically connected to a temperature sensor for obtaining the actual temperature inside the in-vehicle refrigerator; A power field effect transistor switch matrix circuit is connected to the central controller, the low-voltage battery, and the DC buck module and is used to regulate the power supply ratio of the low-voltage battery or the power source to the compressor; A power synthesis circuit is electrically connected to the low-voltage battery and the power source. When the low-voltage battery is used for power supply and the actual temperature of the in-vehicle refrigerator is higher than the set temperature, it regulates the output power of the power source.

[0011] The present invention is further configured such that: the central controller is built with a clock module, and the clock module is used to define time thresholds, and the time thresholds include: A temperature change regulation threshold, which is a standard value for measuring the rising and falling temperature regulation duration of temperature regulation; A temperature change hysteresis threshold, which is a standard value for measuring the continuous duration of the temperature difference after the actual temperature reaches the set temperature; When the actual cooling duration of the vehicle-mounted refrigerator is greater than the temperature change regulation threshold, the central controller regulates the power field effect transistor switch matrix circuit, and increases the power supply power of the power source for the compressor according to the difference between the actual cooling duration and the temperature change regulation threshold; When the continuous duration of the temperature difference is less than the temperature change hysteresis threshold, the central controller regulates the power field effect transistor switch matrix circuit to maintain the power supply ratio of the low-voltage storage battery and the power source, or when the continuous duration of the temperature difference is greater than the temperature change hysteresis threshold, the central controller regulates the power field effect transistor switch matrix circuit to increase the power supply power of the power source for the compressor according to the temperature difference value.

[0012] The present invention is further configured such that: when the actual cooling duration of the vehicle-mounted refrigerator is greater than the temperature change regulation threshold, it indicates that the actual power is lower than the refrigeration drive for the vehicle-mounted refrigerator, and the central controller adopts a PID algorithm for control: ; ; ; , where Kramp is the temperature change rate gain coefficient, P is the proportional term, D is the differential term, integral is the integral term, Kp is the response speed, Ki is the coefficient for eliminating the static error, Kd is the coefficient for suppressing overshoot, dt is the control period synchronized with the temperature sampling rate, and error is the temperature deviation.

[0013] The present invention is further configured such that: when the actual cooling duration of the vehicle-mounted refrigerator is greater than the temperature change regulation threshold, it indicates that the vehicle-mounted refrigerator cools too slowly, and Kramp is set to T, where T is greater than 1 and increases or decreases in integer multiples in turn after the adjustment cycle with a weight of 0.2.

[0014] The present invention is further configured such that: the temperature deviation is the difference between the set temperature and the actual temperature. When the difference is a positive deviation or a negative deviation, the refrigeration power of the compressor is increased or decreased. Among them, during the unit control cycle loop, by comparing the temperature deviation of the previous control cycle with the temperature deviation of the current control cycle, the differential term is adjusted to adjust the increase or decrease of the refrigeration power of the compressor.

[0015] The present invention is further configured as follows: A box cover is rotatably connected to the box body, and a buckle mechanism for keeping the box cover closed is provided between the box body and the box cover. The central controller is connected to a switch detection module located at the buckle mechanism. The switch detection module is used to obtain the open or closed state of the box cover and feedback it to the central controller to obtain the duration of the box cover being open.

[0016] The present invention is further configured as follows: The switch detection module includes a Hall sensor group. The Hall sensor group is arranged at the buckle mechanism and continuously outputs a low-level signal to the central controller when the box cover is in the open state.

[0017] In summary, the present invention has the following beneficial effects: The stable operation of the in-vehicle refrigerator can be ensured by the power supply of the dual power sources. The in-vehicle refrigerator is adaptively powered by the power supply and the low-voltage battery. When the heating rate of the in-vehicle refrigerator does not meet the standard, it can be supplemented by the power supply, so as to take into account the power consumption required for vehicle driving. In terms of dynamic energy replenishment, by collecting and detecting the heating rate and temperature change hysteresis conditions, the power supply ratio of the low-voltage battery and the power supply is dynamically adjusted, and by obtaining the actual cooling rate, the detection and feedback of the temperature change conditions are achieved. When the temperature rises due to the opening and closing of the refrigerator door by personnel, when the duration of the temperature difference is less than the temperature change hysteresis threshold, the central controller controls the power field effect transistor switch matrix circuit to maintain the power supply ratio of the low-voltage battery and the power supply, or when the duration of the temperature difference is greater than the temperature change hysteresis threshold, the central controller controls the power field effect transistor switch matrix circuit to increase the power supply power of the power supply to the compressor according to the temperature difference value, thereby reducing the frequent switching between the power supply modes of the power supply and the low-voltage battery, affecting the service life of the low-voltage battery and the power supply and the stability of vehicle driving. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts.

[0019] Figure 1 Structural schematic of the present invention Figure 1 ; Figure 2 Structural schematic of the present invention Figure 2 ; Figure 3 is Figure 2 The enlarged schematic view of part A in Figure 4 System block diagram of the control module of this embodiment; Figure 5 is the system block diagram of the power management control module in this embodiment; Figure 6 is the flow block diagram of the PID algorithm control in this embodiment.

[0020] In the figure: 1. Box body; 2. Box cover; 3. Buckle mechanism. Detailed implementation manners

[0021] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. Components of the embodiments of the present invention described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0023] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0024] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present invention.

[0025] In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present invention, it should also be noted that, unless otherwise clearly specified and defined, the terms "set", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] As Figures 1-3 shown, an adaptive multi-power supply vehicle-mounted refrigerator includes a box body 1. A placement cavity for placing a compressor and a control module is provided on the box body 1. The control module includes: A power connection module for connecting to a low-voltage battery or a power source to output a power supply voltage signal; A DC step-down module connected to the power connection module. When powered by the power source, it is used to convert the power source to output a driving voltage for driving the compressor; A power management control module electrically connected to the power connection module and the DC step-down module, for switching and coordinating the power supply modes of the low-voltage battery and the power source to the compressor: When there is a temperature difference between the actual temperature and the set temperature of the vehicle-mounted refrigerator, monitor the capacitance status of the power source and the low-voltage battery. If the capacitance of the low-voltage battery is greater than a preset threshold, the power management control module switches the low-voltage battery to supply power to the compressor and allocates the power source to dynamically supplement the power gap of the low-voltage battery.

[0028] As Figure 4 and Figure 5 shown, the power management control module includes: A central controller connected to the low-voltage battery and the power source, obtaining the capacitance status of the low-voltage battery and the power source, and electrically connected with a temperature sensor for obtaining the actual temperature inside the vehicle-mounted refrigerator; A power field effect transistor switch matrix circuit connected to the central controller, the low-voltage battery, and the DC step-down module, for regulating the power supply ratio of the low-voltage battery or the power source to the compressor; A power synthesis circuit electrically connected to the low-voltage battery and the power source. When powered by the low-voltage battery and the actual temperature of the vehicle-mounted refrigerator is higher than the set temperature, regulate the output power of the power source.

[0029] As Figure 4As shown, in this embodiment, the low-voltage battery and the power source are in a parallel relationship in the circuit connection structure. The low-voltage battery is connected to the power management control current after connecting a Schottky diode. The power source installed on the new energy vehicle is connected to the power management module after being connected in series with a DC buck module. The enable control terminal EN of the power management module is electrically connected to the DC buck module to control the power supply ratio of the power source. The set Schottky diode can prevent the current from flowing back to the low-voltage battery and causing damage. The power management control module is composed of a central controller, a power field effect transistor switch matrix circuit, and a power synthesis circuit. Through the setting of the central controller, in this embodiment, the central controller has multiple ADC ports and PWM ports. By connecting the ADC1 port VBAT voltage dividing circuit, the voltage of the low-voltage battery or the power source can be monitored respectively. When the voltage of the low-voltage battery is insufficient, the power supply ratio of the power source can be adjusted. When the voltage of the power source is monitored to be insufficient, the driving demand of the vehicle is preferentially maintained, and the power supply to the in-vehicle refrigerator by the power source is stopped. Specifically, the low-voltage battery voltage monitoring VBAT ≥ 13.2V is regarded as full. And the central controller is also electrically connected to a Hall current sensor to realize the real-time detection of the load current.

[0030] As Figure 5 and Figure 6 shown, the central controller is built-in with a clock module. The clock module is used to define time thresholds, including a temperature change regulation threshold and a temperature change hysteresis threshold. The temperature change regulation threshold is used to measure the standard value of the rising and falling temperature adjustment duration for temperature adjustment, while the temperature change hysteresis threshold is used to measure the standard value of the continuous duration of the set temperature difference after the actual temperature reaches the set temperature. By setting the temperature change hysteresis threshold and the temperature change regulation threshold, it aims to measure the rising and falling temperature rates of temperature adjustment to feedback the difference between the current actual power and the rated power. With the help of the temperature change hysteresis threshold, it is mainly applied when using the in-vehicle refrigerator. The opening and closing of the lid 2 of the in-vehicle refrigerator affect its internal temperature. Specifically, when the actual cooling duration of the in-vehicle refrigerator is greater than the temperature change regulation threshold, the central controller controls the power field effect transistor switch matrix circuit to increase the power supply power of the power source to the compressor according to the difference between the actual cooling duration and the temperature change regulation threshold; or when the continuous duration of the temperature difference is less than the temperature change hysteresis threshold, the central controller controls the power field effect transistor switch matrix circuit to maintain the power supply ratio of the low-voltage battery and the power source, or when the continuous duration of the temperature difference is greater than the temperature change hysteresis threshold, the central controller controls the power field effect transistor switch matrix circuit to increase the power supply power of the power source to the compressor according to the temperature difference value.

[0031] When the actual cooling duration of the in-vehicle refrigerator is greater than the temperature change regulation threshold, it indicates that the actual power is lower than the refrigeration drive for the in-vehicle refrigerator. The central controller uses the PID algorithm for control: ; ; ; , where Kramp is the temperature change rate gain coefficient, P is the proportional term, D is the derivative term, integral is the integral term, Kp is the response speed, Ki is the coefficient for eliminating the static error, Kd is the coefficient for suppressing overshoot, dt is the control period synchronized with the temperature sampling rate, error is the temperature deviation, and error last is the difference value of the previous cycle.

[0032] In this embodiment, for the adjustment of temperature and power, the specific step process is as follows: The user sets the expected storage temperature through the operation interface on the vehicle-mounted refrigerator body 1. During refrigeration, the temperature sensor monitors the temperature change inside the vehicle-mounted refrigerator body 1 in real time, and calculates the time used for each temperature change interval, so as to obtain the rising and falling temperature adjustment time of the actual temperature adjustment, denoted as the real-time adjustment time T real , and then performs a difference operation between the real-time adjustment time T and the temperature change control threshold. For example: The actual temperature measured by the temperature sensor is 15°C, the set temperature is -5°C, the measured temperature deviation is 20°C, and the temperature change situation every 5 minutes is measured to feedback the temperature change rate. The rated refrigeration cooling rate is set to 0.7°C / minute, the measured maximum expected response time is about 28.6 minutes, and the measured actual response time is 35 minutes. Then the actual time consumption exceeds the threshold, so it reflects that the actual cooling time of the vehicle-mounted refrigerator is greater than the temperature change control threshold, indicating that the vehicle-mounted refrigerator cools too slowly. Set the temperature change rate gain coefficient Kramp to T, and the initial value of T is 1. When the actual cooling time is greater than, T is greater than 1 and increases or decreases in integer multiples in turn after adjustment cycle with a weight of 0.2, triggering gain adjustment. The temperature change rate gain coefficient Kramp is gradually increased from 1 in multiples of 0.2*n. For example, after adjusting the temperature change rate gain coefficient from 1 to 1.2, the temperature change rate and the expected temperature change time are measured again in real time. If the monitored temperature change rate is lower than the set value and the expected temperature change time significantly exceeds the threshold within the monitoring period, then the temperature change rate gain coefficient Kramp is adjusted from 1.2 to 1.4 again, and the increase is carried out step by step in turn; Another implementation method is to measure the actual temperature change time and the preset temperature change time threshold, divide the actual temperature change time by the temperature change time threshold, and round up the obtained difference multiple (only take the integer value, ignoring the numbers after the decimal point). For example, if it is twice the multiple value, that is, n = 2, then when making one-step adjustment, the temperature change rate gain coefficient Kramp is adjusted from 1 to 1.4, and integer multiple adjustment is carried out with a coefficient of 0.2, which can dynamically adjust the error and avoid the risk of overshoot.

[0033] The temperature deviation is the difference between the set temperature and the actual temperature. When the difference is a positive deviation or a negative deviation, the refrigeration power of the compressor is increased or decreased. During the unit control cycle, by comparing the temperature deviation of the previous control cycle with that of the current control cycle, a differential term adjustment is performed to adjust the increase or decrease of the refrigeration power of the compressor.

[0034] Among them, for the differential term D, when the next detection cycle is adjusted, the temperature difference measured in the next detection cycle is recorded as the new error, and the temperature difference in the previous detection cycle is recorded as , through differential operation, where dt is the control cycle of the central controller, such as 10 ms, and the sampling frequency of the temperature sensor is set synchronously. After calculating that the output power of P + I + D is 180 W, the output is adjusted to 252 W to increase the rotation speed of the compressor, thereby accelerating the refrigeration efficiency of the in-vehicle refrigerator.

[0035] On the above basis, in this embodiment, to laterally feedback the influence of the in-vehicle refrigerator on the refrigeration factor through the opening and closing duration of the in-vehicle refrigerator. For example, when it is detected that the lid 2 of the in-vehicle refrigerator is open, the power supply mode of the low-voltage battery is maintained and the auxiliary power supply of the power source is not adjusted for the time being. And a buckle mechanism 3 for keeping the lid 2 closed is provided between the box body 1 and the lid 2. Not only is the buckling connection between the box body 1 and the lid 2 realized, but a switch detection module located at the buckle mechanism 3 is connected through the central controller. The switch detection module is used to obtain the open or closed state of the lid 2 and feedback it to the central controller to obtain the opening duration of the lid 2. Specifically, the switch detection module includes a Hall sensor group. The Hall sensor group is arranged at the buckle mechanism 3 and continuously outputs a low-level signal to the central controller in response to the lid 2 being in the open state. Specifically, the switch detection module includes a Hall sensor group. The Hall sensor group is arranged at the buckle mechanism 3 and continuously outputs a low-level signal to the central controller in response to the lid 2 being in the open state. And the central controller judges the opening duration of the lid 2 by monitoring the cycle of the low-level signal. As a technical expansion of this technical solution, a reminder circuit composed of an LED or a buzzer can be set, and a longest threshold for the opening of the lid 2 is set. If the actual opening duration is greater than the longest threshold, the reminder circuit is triggered to remind the driver and passengers through sound and light.

[0036] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An adaptive multi-powered vehicle refrigerator, characterized in that: It includes a box body (1) provided with a placement cavity for placing a compressor and a control module. The control module includes: A power connection module for connecting to a low-voltage battery or a power source to output a power supply voltage signal; A DC buck module connected to the power connection module. When powered by the power source, it is used to convert the power source to output a driving voltage for driving the compressor; A power management control module electrically connected to the power connection module and the DC buck module, for switching and coordinating the power supply modes of the low-voltage battery and the power source to the compressor: When there is a temperature difference between the actual temperature and the set temperature of the in-vehicle refrigerator, monitor the capacitance status of the power source and the low-voltage battery. If the capacitance of the low-voltage battery is greater than the preset threshold, the power management control module switches the low-voltage battery to supply power to the compressor and allocates the power source to dynamically supplement the power gap of the low-voltage battery.

2. The adaptive multi-power in-vehicle refrigerator according to claim 1, characterized in that: The power management control module includes: A central controller connected to the low-voltage battery and the power source, obtaining the capacitance status of the low-voltage battery and the power source, and electrically connected with a temperature sensor for obtaining the actual temperature inside the in-vehicle refrigerator; A power field-effect transistor switch matrix circuit connected to the central controller, the low-voltage battery, and the DC buck module, for regulating the power supply ratio of the low-voltage battery or the power source to the compressor; A power synthesis circuit electrically connected to the low-voltage battery and the power source. When powered by the low-voltage battery and the actual temperature of the in-vehicle refrigerator is higher than the set temperature, it regulates the output power of the power source.

3. The adaptive multi-power vehicle-mounted refrigerator according to claim 2, wherein: The central controller is built-in with a clock module, and the clock module is used to define time thresholds, which include: A temperature change regulation threshold for measuring the standard value of the rising and falling temperature regulation duration of temperature regulation; A temperature change hysteresis threshold for setting the standard value of the continuous duration of measuring the temperature difference after the actual temperature reaches the set temperature; When the actual cooling duration of the in-vehicle refrigerator is greater than the temperature change regulation threshold, the central controller regulates the power field-effect transistor switch matrix circuit to increase the power supply power of the power source to the compressor according to the difference between the actual cooling duration and the temperature change regulation threshold; When the continuous duration of the temperature difference is less than the temperature change hysteresis threshold, the central controller regulates the power field-effect transistor switch matrix circuit to maintain the power supply ratio of the low-voltage battery and the power source, or when the continuous duration of the temperature difference is greater than the temperature change hysteresis threshold, the central controller regulates the power field-effect transistor switch matrix circuit to increase the power supply power of the power source to the compressor according to the temperature difference value.

4. The adaptive multi-power vehicle-mounted refrigerator according to claim 3, wherein: When the actual cooling duration of the in-vehicle refrigerator is greater than the temperature change regulation threshold, it indicates that the actual power is lower than the refrigeration drive of the in-vehicle refrigerator, and the central controller uses the PID algorithm for control: ； ； ； , where Kramp is the temperature change rate gain coefficient, P is the proportional term, D is the differential term, integral is the integral term, Kp is the response speed, Ki is the coefficient for eliminating the static error, Kd is the coefficient for suppressing overshoot, dt is the control period synchronized with the temperature sampling rate, and error is the temperature deviation.

5. The adaptive multi-power in-vehicle refrigerator according to claim 4, characterized in that: When the actual cooling duration of the in-vehicle refrigerator is greater than the temperature change regulation threshold, it indicates that the in-vehicle refrigerator cools too slowly. Set Kramp to T, where T is greater than 1 and increases or decreases in integer multiples in turn after the adjustment cycle with a weight of 0.

2.

6. The adaptive multi-power in-vehicle refrigerator according to claim 4, characterized in that: The temperature deviation is the difference between the set temperature and the actual temperature. When the difference is a positive deviation or a negative deviation, the refrigeration power of the compressor is increased or decreased. Among them, during the unit control cycle, by comparing the temperature deviation of the previous control cycle with the temperature deviation of the current control cycle, a differential term adjustment is performed to adjust the increase or decrease of the refrigeration power of the compressor.

7. The adaptive multi-powered vehicle-mounted refrigerator according to claim 2, wherein: A lid (2) is rotatably connected to the box body (1). A buckle mechanism (3) for keeping the lid (2) closed is provided between the box body (1) and the lid (2). The central controller is connected to a switch detection module located at the buckle mechanism (3). The switch detection module is used to obtain the open or closed state of the lid (2) and feedback it to the central controller to obtain the open duration of the lid (2).

8. The adaptive multi-power in-vehicle refrigerator according to claim 7, characterized in that: The switch detection module includes a Hall sensor group. The Hall sensor group is arranged at the buckle mechanism (3) and continuously outputs a low-level signal to the central controller in response to the lid (2) being in the open state.

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