Quick cooling control method and system for vehicle-mounted refrigerator

Abstract

The invention discloses a quick cooling control method and system for a vehicle-mounted refrigerator, and relates to the technical field of refrigeration of compressor type vehicle-mounted refrigerators. According to the method, efficient cooling is achieved through stage control, after a system is initialized, when the initial temperature is higher than a stage switching threshold value, a full-load temperature pulling stage is started, and a compressor, an electronic expansion valve and a draught fan operate at the maximum parameters to be rapidly cooled; switching to a constant temperature difference closed-loop control and convection wind speed linkage regulation stage after the temperature reaches the standard, dynamically regulating the rotating speed of a compressor and the opening degree of an expansion valve by using a PID (Proportion Integration Differentiation) algorithm by taking the heat exchange temperature difference between an object and an evaporator as a controlled object, and regulating the wind speed of a fan in sections according to the temperature difference; and after the temperature is close to a target value, steady-state PID temperature control is switched to, and the target temperature is accurately maintained. The system comprises a main control module, a temperature acquisition module, a compressor module, an electronic expansion valve module, a convection fan module and the like, hardware does not need to be greatly changed, and the system can be compatible with mainstream vehicle-mounted refrigerators. The cooling rate, the temperature control precision and the energy consumption are considered, and the vehicle-mounted multi-scene refrigeration requirement is met.

Description

Technical Field

[0001] This invention relates to the field of vehicle-mounted refrigeration equipment technology, and in particular to a rapid cooling control method for a compressor-type vehicle-mounted refrigerator and a compatible control system. Background Technology

[0002] The core performance indicators of a car refrigerator include cooling rate, temperature control accuracy, operating energy consumption, and system stability. Among these, the cooling rate directly affects the user experience, especially in the high-temperature car environment during summer.

[0003] Existing vehicle refrigerator refrigeration control technology typically employs a conventional PID closed-loop temperature control scheme. This scheme uses the target temperature inside the refrigerator as the controlled object and adjusts the compressor's operating parameters in real time through a PID algorithm to control the temperature inside the refrigerator. However, in scenarios involving a large temperature drop from room temperature to the target low temperature, the compressor's output power gradually decreases as the temperature difference narrows, failing to fully utilize the system's cooling capacity and resulting in a long waiting time for the temperature to drop from room temperature to the target cooling temperature.

[0004] In addition, some vehicle refrigerators employ a full-load operation temperature control scheme. This scheme, in order to increase the cooling speed, controls the compressor to run continuously at a high load throughout the cooling process, without linking the evaporator target temperature with the convection fan speed, making it a rather simplistic approach. This results in a significant reduction in the temperature difference between the item being cooled and the evaporator target temperature in the later stages of cooling. The heat exchange temperature difference between the item and the evaporator decreases simultaneously, leading to a sharp decline in convective heat transfer efficiency. Even with the compressor running at full load continuously, the cooling rate cannot be effectively increased. Furthermore, prolonged full-load operation of the compressor results in energy waste, increased susceptibility to malfunctions, shortened equipment lifespan, and higher noise levels. The lack of coordinated adjustment of the convection fan speed at the heat exchange end creates a bottleneck in heat exchange efficiency under small temperature difference conditions, limiting the cooling rate. Summary of the Invention

[0005] Therefore, the purpose of this invention is to provide a rapid cooling control method and system for vehicle-mounted refrigerators, which takes into account high cooling efficiency, good temperature control accuracy, low operating energy consumption, and is compatible with mainstream compressor-type vehicle-mounted refrigerators.

[0006] The technical solution adopted by this invention to solve its technical problem is as follows:

[0007] A method for rapid cooling control of a vehicle-mounted refrigerator includes a system for implementing the control method: a main control module, a temperature acquisition module, a compressor, an evaporator, an electronic expansion valve for regulating refrigerant flow, and a convection fan;

[0008] The rapid cooling control method for vehicle refrigerators includes the following steps:

[0009] S1: The system powers on and completes hardware self-test and parameter initialization, and obtains the target cooling temperature Ts set by the user. The main control module has core control parameters pre-stored. The core control parameters include at least the stage switching threshold temperature Tth, the constant heat exchange temperature difference set value ΔTset between the real-time temperature of the item to be cooled and the evaporator temperature, the maximum allowable operating parameters of the compressor, and the convection fan speed adjustment range.

[0010] S2: The temperature acquisition module acquires the real-time temperature T of the items to be cooled in the vehicle refrigerator. If the initial real-time temperature T0 > Tth, the main control module controls the compressor to run continuously at the maximum allowable operating parameters and the convection fan to run at the preset initial maximum wind speed until the real-time temperature T ≤ Tth, triggering S3.

[0011] S3: Includes synchronous execution of constant temperature difference closed-loop control and convective wind speed linkage adjustment;

[0012] Constant temperature difference closed-loop control: The main control module calculates the real-time temperature difference ΔT between the real-time temperature T of the item to be cooled and the target cooling temperature Ts, where ΔT = T - Ts; the main control module adjusts the operating speed of the compressor and the opening of the electronic expansion valve so that the real-time temperature difference ΔT is within the preset allowable fluctuation range of ΔTset;

[0013] Convection fan speed linkage adjustment: The main control module adjusts the operating speed of the convection fan linearly or in segments based on the real-time temperature difference ΔT.

[0014] In step S2, the core control parameters also include the stage switching hysteresis interval Tth', where Tth' ∈ [Tth, Tth+x℃], and 1 ≤ x ≤ 3; when the real-time temperature T fluctuates within the stage switching hysteresis interval, the stage switching action is not performed.

[0015] In the constant temperature difference closed-loop control of step S3, the preset allowable range of ΔTset is ΔTset', where ΔTset'∈[ΔTset-y℃, ΔTset+y℃], and 0.5≤y≤1.5.

[0016] In S3, the temperature acquisition module can acquire the real-time evaporation temperature Te of the evaporator. The main control module takes the actual heat exchange temperature difference T-Te between the real-time temperature T of the item to be cooled and the real-time evaporation temperature Te of the evaporator as the directly controlled object. By controlling the compressor running speed and the opening of the electronic expansion valve, the actual heat exchange temperature difference T-Te of the controlled object is made to be within the preset allowable range of the constant heat exchange temperature difference set value ΔTset.

[0017] In step S3, the main control module uses an incremental PID closed-loop algorithm to adjust the compressor operating speed and the opening of the electronic expansion valve, specifically as follows:

[0018] When ΔT>ΔTset+y℃, the main control module proportionally increases the compressor operating speed and increases the opening of the electronic expansion valve to improve the cooling capacity output;

[0019] When ΔT < ΔTset-y℃, the main control module proportionally reduces the compressor operating speed and the opening of the electronic expansion valve to reduce the cooling capacity output;

[0020] When ΔT is at ΔTset', the main control module maintains the current operating state of the compressor and the electronic expansion valve.

[0021] In S3, the convective wind speed linkage adjustment specifically refers to:

[0022] When ΔT≥Tth-z℃, the convection fan operates at a preset initial maximum wind speed;

[0023] When ΔTset+y℃≤ΔT<Tth-z℃, the convection fan operates at A% of its maximum rated wind speed;

[0024] When ΔTset-y℃≤ΔT<ΔTset+y℃, the convection fan operates at B% of the maximum rated wind speed;

[0025] When ΔT≤ΔTset-y℃, the convection fan operates at C% of the maximum rated wind speed;

[0026] The condition 0 < z ≤ 1;

[0027] The value is 0 < C < B < A ≤ 80.

[0028] In step S2, if the initial real-time temperature T0 ≤ Tth, the system directly proceeds to step S3.

[0029] In S1, the maximum allowable operating parameters of the compressor include the compressor's maximum rated speed, maximum operating current, and maximum adaptive opening of the electronic expansion valve;

[0030] In S2, the compressor continuously operates at the maximum permissible operating parameters, including the compressor operating at the maximum rated speed and the electronic expansion valve operating at the opening degree corresponding to the maximum cooling capacity.

[0031] It also includes step S4: when the real-time temperature T≤Ts+x1℃, the system exits the vehicle refrigerator rapid cooling control mode and stabilizes the temperature inside the vehicle refrigerator at the target cooling temperature Ts, where 0≤x1≤2.

[0032] A vehicle-mounted refrigerator rapid cooling control system is used to execute a vehicle-mounted refrigerator rapid cooling control method, and also includes a compressor drive module, an electronic expansion valve drive module, and a convection fan drive module;

[0033] The main control module is used to complete system initialization, parameter storage, logic judgment and control calculation, and output drive control signals to the compressor drive module, electronic expansion valve drive module and convection fan drive module;

[0034] The compressor drive module is used to receive control signals from the main control module and steplessly adjust the compressor's operating speed and operating current.

[0035] The electronic expansion valve drive module is used to receive control signals from the main control module and adjust the opening of the electronic expansion valve through a stepper motor to control the refrigerant circulation flow rate.

[0036] The convection fan drive module is used to receive control signals from the main control module and steplessly adjust the operating speed of the convection fan.

[0037] The beneficial effects of this invention are:

[0038] 1. Improved cooling efficiency. This application adopts a phased control strategy. In the early stage, if the temperature difference between the target temperature and the temperature of the item to be cooled is large, the system operates at full capacity to rapidly cool down the item. In the middle and later stages, it switches to a constant heat exchange temperature difference closed-loop control. By dynamically adjusting the state of the compressor and electronic expansion valve, a constant heat exchange temperature difference between the item to be cooled and the evaporator is maintained. Furthermore, the convection fan speed gradient is adjusted in conjunction with this to improve heat exchange efficiency. Compared to conventional temperature control schemes, this addresses the problem of low heat exchange efficiency under small temperature difference conditions, thus improving cooling efficiency.

[0039] 2. High temperature control accuracy: The system has preset temperature setpoints to adapt to different scenarios. During the later stages of cooling, it switches to a steady-state PID temperature control mode to stably maintain the internal temperature near the user-set target temperature, avoiding temperature overshoot and excessive fluctuations caused by continuous full-load compressor operation. The system has preset parameters such as different stage switching threshold temperatures (Tth) and constant heat exchange temperature difference setpoints (ΔTset), which can be called according to different scenarios to meet the refrigeration and freezing storage needs of various items such as fresh produce, pharmaceuticals, and beverages. This facilitates future function development or expansion to adapt to multiple storage needs.

[0040] 3. Reduce energy consumption and extend equipment life. In the mid-to-late stages, the compressor operating parameters are dynamically adjusted based on real-time temperature differences to avoid long-term continuous full-load operation of the compressor, reduce the frequency of compressor start-stop and overload operation time, adapt to the operating conditions of vehicle low-voltage power supply, and at the same time reduce equipment operating losses and extend the service life of the compressor and the whole machine.

[0041] 4. Low implementation cost and strong compatibility. It can be implemented through optimization and upgrade of control logic, without the need for major changes to the hardware structure and refrigeration circuit of the vehicle refrigerator. It is compatible with the hardware platform of existing mainstream compressor-type vehicle refrigerators, making mass production and implementation easy and possessing certain application value and market promotion prospects. Attached Figure Description

[0042] Figure 1 This is a flowchart of step S1 in the rapid cooling control method.

[0043] Figure 2 This is a flowchart of step S2 in the rapid cooling control method.

[0044] Figure 3 This is a flowchart of step S3 in the rapid cooling control method.

[0045] Figure 4 This is a flowchart of step S4 in the rapid cooling control method. Detailed Implementation

[0046] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention. Furthermore, it should be noted that, for ease of description, only the parts related to the present invention are shown in the accompanying drawings, not all of them.

[0047] This application provides a method for rapid cooling control of a vehicle-mounted refrigerator, which is based on a compressor-type vehicle-mounted refrigerator refrigeration system. The refrigeration system includes a main control module, a temperature acquisition module, a DC inverter compressor and a compressor drive module, an evaporator, an electronic expansion valve and an electronic expansion valve drive module, a DC convection fan and a convection fan drive module.

[0048] Preferably, the main control module uses an automotive-grade MCU with built-in storage and processing units to perform system initialization, parameter storage, logic judgment, and PID control calculations, and outputs PWM drive control signals to each drive module. The temperature acquisition module uses an NTC temperature sensor, installed in the storage area of ​​the items to be refrigerated and at the evaporator coil, and communicates with the AD sampling port of the main control module to collect the real-time temperature T of the items to be refrigerated and the real-time evaporation temperature Te of the evaporator. The compressor drive module is a DC inverter compressor drive board, connected to the PWM output port of the main control module, to receive control signals and steplessly adjust the compressor's operating speed and current. The electronic expansion valve drive module is a stepper motor drive circuit, connected to the IO port of the main control module, to receive control signals and precisely adjust the opening of the electronic expansion valve through the stepper motor to control the refrigerant circulation flow. The convection fan drive module is a DC fan drive circuit, connected to the PWM output port of the main control module, to receive control signals and steplessly adjust the operating speed of the convection fan.

[0049] As one implementation method, the user sets the target cooling temperature Ts=0℃, and the core control parameters pre-stored in the main control module are as follows:

[0050] The stage switching threshold temperature Tth = 19℃; the stage switching hysteresis interval Tth' is [19℃, 21℃], i.e., x = 2℃; the constant heat exchange temperature difference setpoint ΔTset = 15℃, and the allowable fluctuation interval ΔTset' is [14℃, 16℃], i.e., y = 1℃; the maximum allowable operating parameters of the compressor are: maximum rated speed 3000rpm, maximum operating current 8A, and maximum adaptive opening of the electronic expansion valve 80%; the convection fan speed adjustment range is 30%~80% of the maximum rated speed, z = 1℃, A = 80, B = 50, and C = 30. The rapid cooling control method for the vehicle-mounted refrigerator in this embodiment specifically includes the following steps:

[0051] S1: System Initialization and Parameter Preset:

[0052] After the system is powered on, the main control module completes a hardware self-test, checking the operating status of the main control module, temperature sensor, compressor, electronic expansion valve, and convection fan. After confirming that there are no hardware faults, it obtains the user-set target cooling temperature Ts=0℃, loads the pre-stored core control parameters, and completes the initialization preparation.

[0053] S2: Full-load temperature control stage:

[0054] The temperature acquisition module collects the initial real-time temperature T0 of the items to be cooled inside the refrigerator. If the initial real-time temperature T0 = 30℃ > Tth = 19℃, the system directly enters the full-load temperature control stage.

[0055] During this stage, the main control module outputs control signals to control the compressor to run continuously at its maximum rated speed of 3000 rpm, the electronic expansion valve to maintain an opening of 80%, the convection fan to run at 80% of its maximum rated wind speed, and the system to output maximum cooling capacity. By utilizing the high heat exchange efficiency under the large temperature difference of 30℃, the temperature of the items to be cooled is quickly lowered.

[0056] The temperature acquisition module continuously collects the real-time temperature T of the item to be cooled, and the main control module monitors temperature changes in real time. When the real-time temperature T fluctuates within the hysteresis range of 19℃ to 21℃, no stage switching action is performed to avoid system instability caused by frequent switching. When the real-time temperature T continuously drops to T≤19℃ and remains stable for 3 minutes, the main control module triggers a stage switching command, and the system enters step S3. If the initial real-time temperature T0≤19℃ in this embodiment, the system directly skips stage S2 and enters stage S3.

[0057] S3: Constant temperature difference closed-loop control and convective wind speed linkage adjustment stage:

[0058] Once the system enters this phase, it simultaneously executes constant temperature difference closed-loop control and convective wind speed linkage adjustment, with the two closed loops operating in tandem. Specifically:

[0059] Constant temperature difference closed-loop control: The main control module calculates the real-time temperature difference ΔT between the real-time temperature T of the item to be cooled and the target cooling temperature Ts, where ΔT = T - Ts. The main control module adjusts the compressor's operating speed and the opening of the electronic expansion valve to ensure that the real-time temperature difference ΔT is within the preset allowable fluctuation range of ΔTset. Furthermore, simultaneously, the temperature acquisition module acquires the real-time evaporation temperature Te of the evaporator. The main control module uses the actual heat exchange temperature difference between T and Te as the directly controlled object, controlling the actual heat exchange temperature difference T - Te to remain constant at the constant heat exchange temperature difference setpoint ΔTset = 15℃, i.e., controlling T - Te = ΔTset = 15℃, thereby achieving a decrease in the real-time temperature T of the item to be cooled. When the real-time temperature T of the item to be cooled decreases, i.e., ΔT decreases, the compressor's operating speed and the opening of the electronic expansion valve are adjusted through an incremental PID closed-loop algorithm to ensure that ΔT remains within the preset allowable range of ΔTset, thus achieving constant temperature difference closed-loop control. Preferably, the allowable fluctuation range ΔTset∈[14℃,16℃] is specified, and the specific control logic is as follows:

[0060] When ΔT > 16℃, the main control module proportionally increases the compressor operating speed and increases the opening of the electronic expansion valve to increase the cooling capacity output and accelerate the cooling rate. At the same time, it controls the opening of the electronic expansion valve through superheat control to ensure that the superheat is stable at 5℃ and avoids the risk of liquid slugging.

[0061] When 14℃≤ΔT≤16℃, the main control module maintains the current operating state of the compressor and electronic expansion valve to ensure the stability of the heat exchange temperature difference;

[0062] When ΔT < 14℃, the main control module proportionally reduces the compressor operating speed and the opening of the electronic expansion valve to reduce the cooling capacity output and avoid energy waste and temperature overshoot.

[0063] Convection fan speed linkage adjustment: While maintaining constant temperature difference closed-loop control, the main control module adjusts the operating speed of the convection fan in segments based on the real-time temperature difference ΔT. The specific control logic is as follows:

[0064] When ΔT≥18℃, the convection fan operates at 80% of its maximum rated wind speed to maximize the forced convection heat transfer efficiency.

[0065] When 16℃≤ΔT<18℃, the convection fan operates at 80% of its maximum rated wind speed to meet the heat exchange requirements of medium and high temperature difference conditions.

[0066] When 14℃≤ΔT<16℃, the convection fan operates at 50% of its maximum rated wind speed, balancing heat exchange efficiency and operating noise.

[0067] When ΔT≤14℃, the convection fan operates at 30% of its maximum rated wind speed to maintain basic heat exchange requirements and reduce energy consumption and noise.

[0068] S4: Steady-state PID temperature control mode:

[0069] When the real-time temperature T collected by the temperature acquisition module is ≤0℃+2℃ and remains stable for 5 minutes, the system exits the rapid cooling control mode and switches to the steady-state PID temperature control mode. The main control module adjusts the operating status of the compressor, electronic expansion valve and convection fan through conventional PID algorithm to stabilize the temperature inside the box at the target cooling temperature of 0℃. The temperature control accuracy can be calibrated according to the requirements of different product models or refrigeration modes to ensure the storage safety of items to be refrigerated.

[0070] In this implementation, on the one hand, compared with conventional temperature control schemes, the cooling time from the initial real-time temperature T0=30℃ to the target temperature Ts=0℃ is shortened by about 10 minutes, a reduction of more than 30%, effectively addressing the user's pain point of long waiting time. On the other hand, in the mid-to-late stages, the compressor operating parameters are dynamically adjusted based on the real-time temperature difference, reducing the frequency of compressor start-stop and overload operation time, and reducing energy consumption per cooling cycle by more than 20%.

[0071] Optionally, the temperature acquisition module can also use a multi-point non-contact infrared temperature sensor to directly acquire the surface temperature of the item to be cooled, without needing to be attached to the inner liner, thereby improving the temperature response speed. The average value of multi-point sampling is used as the real-time temperature T to improve the uniformity of temperature control inside the chamber.

[0072] Optionally, the main control module has a built-in library of optimal control parameters for different ambient temperatures, initial temperatures, and target temperatures, pre-stored based on machine learning algorithms. After the system is powered on, it automatically matches the optimal parameters according to the real-time operating conditions, replacing the fixed preset values, such as Tth, Tth'ΔTset, ΔTset', etc., to further improve the cooling efficiency under different operating conditions and different usage scenarios.

[0073] Optionally, the main control module incorporates a noise optimization target into its control logic. When the vehicle is detected to be in a parked state, it automatically reduces the maximum speed limit of the convection fan to balance the cooling rate and operating noise, thereby improving the user experience in parking scenarios.

[0074] Furthermore, the vehicle-mounted refrigerator rapid cooling control system also includes a vehicle power supply, a vehicle power management module, and a human-machine interface module. The vehicle power management module is compatible with a wide voltage input of 12V~24V for vehicles and is equipped with undervoltage, overvoltage, overcurrent, and overheat protection functions to adapt to vehicle power supply conditions. The human-machine interface module uses a combination of a touch screen and physical buttons to receive user-defined target temperature settings and rapid cooling mode start / stop commands, and displays real-time information such as the internal temperature, equipment operating status, and fault prompts.

[0075] Furthermore, the system is also equipped with door opening disturbance protection. When the refrigerator door is detected to be open, the closed-loop control of the rapid cooling mode is immediately suspended, the compressor is increased to medium-high speed, and the fan runs at maximum speed. After the door is closed, the initial temperature is collected again and the rapid cooling control logic is restored to avoid temperature control failure caused by door opening disturbance.

[0076] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for rapid cooling control of a vehicle-mounted refrigerator, comprising a system for implementing the control method: a main control module, a temperature acquisition module, a compressor, an evaporator, an electronic expansion valve for regulating refrigerant flow, and a convection fan; Its features are, The rapid cooling control method for vehicle refrigerators includes the following steps: S1: The system powers on and completes hardware self-test and parameter initialization, and obtains the target cooling temperature Ts set by the user. The main control module has core control parameters pre-stored. The core control parameters include at least the stage switching threshold temperature Tth, the constant heat exchange temperature difference set value ΔTset between the real-time temperature of the item to be cooled and the evaporator temperature, the maximum allowable operating parameters of the compressor, and the convection fan speed adjustment range. S2: The temperature acquisition module acquires the real-time temperature T of the items to be cooled in the vehicle refrigerator. If the initial real-time temperature T0 > Tth, the main control module controls the compressor to run continuously at the maximum allowable operating parameters and the convection fan to run at the preset initial maximum wind speed until the real-time temperature T ≤ Tth, triggering S3. S3: Includes synchronous execution of constant temperature difference closed-loop control and convective wind speed linkage adjustment; Constant temperature difference closed-loop control: The main control module calculates the real-time temperature difference ΔT between the real-time temperature T of the item to be cooled and the target cooling temperature Ts, where ΔT = T - Ts; the main control module adjusts the operating speed of the compressor and the opening of the electronic expansion valve so that the real-time temperature difference ΔT is within the preset allowable fluctuation range of ΔTset; Convection fan speed linkage adjustment: The main control module adjusts the operating speed of the convection fan linearly or in segments based on the real-time temperature difference ΔT.

2. The rapid cooling control method for a vehicle-mounted refrigerator according to claim 1, characterized in that, In step S2, the core control parameters also include the stage switching hysteresis interval Tth', where Tth' ∈ [Tth, Tth+x℃], and 1 ≤ x ≤ 3; when the real-time temperature T fluctuates within the stage switching hysteresis interval, the stage switching action is not performed.

3. The rapid cooling control method for a vehicle-mounted refrigerator according to claim 1, characterized in that, In the constant temperature difference closed-loop control of step S3, the preset allowable range of ΔTset is ΔTset', where ΔTset'∈[ΔTset-y℃, ΔTset+y℃], and 0.5≤y≤1.

5.

4. The rapid cooling control method for a vehicle-mounted refrigerator according to claim 1, characterized in that, In S3, the temperature acquisition module can acquire the real-time evaporation temperature Te of the evaporator. The main control module takes the actual heat exchange temperature difference T-Te between the real-time temperature T of the item to be cooled and the real-time evaporation temperature Te of the evaporator as the directly controlled object. By controlling the compressor running speed and the opening of the electronic expansion valve, the actual heat exchange temperature difference T-Te of the controlled object is made to be within the preset allowable range of the constant heat exchange temperature difference set value ΔTset.

5. The rapid cooling control method for a vehicle-mounted refrigerator according to claim 3, characterized in that, In step S3, the main control module uses an incremental PID closed-loop algorithm to adjust the compressor operating speed and the opening of the electronic expansion valve, specifically as follows: When ΔT>ΔTset+y℃, the main control module proportionally increases the compressor operating speed and increases the opening of the electronic expansion valve to improve the cooling capacity output; When ΔT < ΔTset-y℃, the main control module proportionally reduces the compressor operating speed and the opening of the electronic expansion valve to reduce the cooling capacity output; When ΔT is at ΔTset', the main control module maintains the current operating state of the compressor and the electronic expansion valve.

6. The rapid cooling control method for a vehicle-mounted refrigerator according to claim 3, characterized in that, In S3, the convective wind speed linkage adjustment specifically refers to: When ΔT≥Tth-z℃, the convection fan operates at a preset initial maximum wind speed; When ΔTset+y℃≤ΔT<Tth-z℃, the convection fan operates at A% of its maximum rated wind speed; When ΔTset-y℃≤ΔT<ΔTset+y℃, the convection fan operates at B% of the maximum rated wind speed; When ΔT≤ΔTset-y℃, the convection fan operates at C% of the maximum rated wind speed; The condition 0 < z ≤ 1; The value is 0 < C < B < A ≤ 80.

7. The rapid cooling control method for a vehicle-mounted refrigerator according to claim 1, characterized in that, In step S2, if the initial real-time temperature T0 ≤ Tth, the system directly proceeds to step S3.

8. The rapid cooling control method for a vehicle-mounted refrigerator according to claim 1, characterized in that, In S1, the maximum allowable operating parameters of the compressor include the compressor's maximum rated speed, maximum operating current, and maximum adaptive opening of the electronic expansion valve; In S2, the compressor continuously operates at the maximum permissible operating parameters, including the compressor operating at the maximum rated speed and the electronic expansion valve operating at the opening degree corresponding to the maximum cooling capacity.

9. The rapid cooling control method for a vehicle-mounted refrigerator according to claim 1, characterized in that, It also includes step S4: when the real-time temperature T≤Ts+x1℃, the system exits the vehicle refrigerator rapid cooling control mode and stabilizes the temperature inside the vehicle refrigerator at the target cooling temperature Ts, where 0≤x1≤2.

10. A rapid cooling control system for a vehicle-mounted refrigerator, characterized in that, The method for implementing the rapid cooling control method for a vehicle refrigerator according to any one of claims 1-9 further includes a compressor drive module, an electronic expansion valve drive module, and a convection fan drive module; The main control module is used to complete system initialization, parameter storage, logic judgment and control calculation, and output drive control signals to the compressor drive module, electronic expansion valve drive module and convection fan drive module; The compressor drive module is used to receive control signals from the main control module and steplessly adjust the compressor's operating speed and operating current. The electronic expansion valve drive module is used to receive control signals from the main control module and adjust the opening of the electronic expansion valve through a stepper motor to control the refrigerant circulation flow rate. The convection fan drive module is used to receive control signals from the main control module and steplessly adjust the operating speed of the convection fan.

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