Intelligent control method for vehicle-mounted refrigerator and vehicle-mounted refrigerator

Abstract

The invention relates to the technical field of intelligent control, in particular to a vehicle-mounted refrigerator intelligent control method and a vehicle-mounted refrigerator. The method is executed by a controller of the vehicle-mounted refrigerator and comprises the steps that a plurality of refrigerator operation parameters of the vehicle-mounted refrigerator are obtained; wherein the multiple refrigerator operation parameters comprise current defrosting influence factor parameters, refrigerator external temperature and effective door opening times in a current refrigeration period; based on the at least one refrigerator operation parameter, a defrosting triggering time threshold value is adjusted; wherein the adjusted defrosting time threshold value is not lower than the minimum defrosting interval time threshold value; when the compressor operation time accumulated from the current refrigeration cycle reaches the adjusted defrosting triggering time threshold value, a defrosting process is triggered; and in the defrosting process, the melting degree of the frost layer is judged according to the working state of the defrosting sensor, and the defrosting process is kept or quitted according to the judgment result. According to the invention, adaptive defrosting can be carried out.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of intelligent control, in particular to a vehicle-mounted refrigerator intelligent control method and a vehicle-mounted refrigerator. BACKGROUND

[0002] As an important part of the modern automotive interior system, the vehicle-mounted refrigerator is widely used in motor homes, business cars and high-end passenger cars to provide refrigeration and freezing functions for users.

[0003] At present, the defrosting control of the vehicle-mounted refrigerator mainly adopts a fixed time interval-based defrosting control, that is, a defrosting process is triggered after the compressor accumulates a fixed time (such as 12 hours).

[0004] However, this scheme is simple to implement but poor in adaptability, and cannot adjust the defrosting timing according to the actual frosting situation, so it is urgent to improve. SUMMARY

[0005] Therefore, it is necessary to provide a vehicle-mounted refrigerator intelligent control method and a vehicle-mounted refrigerator capable of adaptive defrosting in view of the above technical problems.

[0006] In a first aspect, the present application provides a vehicle-mounted refrigerator intelligent control method, which is executed by a controller of a vehicle-mounted refrigerator, and the method comprises:

[0007] obtaining a plurality of refrigerator operating parameters of the vehicle-mounted refrigerator; wherein the plurality of refrigerator operating parameters comprise a current defrosting influence factor parameter, a refrigerator external temperature and a number of effective door opening times in a current refrigeration period;

[0008] adjusting a defrosting trigger time threshold based on at least one of the refrigerator operating parameters; wherein the adjusted defrosting time threshold is not lower than a minimum defrosting interval time threshold;

[0009] triggering a defrosting process when a compressor operating time accumulated from the start of the current refrigeration period reaches the adjusted defrosting trigger time threshold; and

[0010] In the defrosting process, the degree of frost melting is determined according to the working state of a defrosting sensor, and the defrosting process is maintained or exited according to the determination result.

[0011] In one of the embodiments, the defrosting trigger time threshold is adjusted based on at least one of the refrigerator operating parameters, specifically:

[0012] When the vehicle-mounted refrigerator is in a first power-on state, a first power-on defrosting time is determined according to the refrigerator external temperature, and the first power-on defrosting time is taken as the defrosting trigger time threshold; wherein the higher the refrigerator external temperature, the shorter the first power-on defrosting time;

[0013] When the vehicle refrigerator completes initial power-on and enters a normal running state, a normal running defrosting time is determined according to a valid door opening number, and the normal running defrosting time is taken as a defrosting trigger time threshold; the more the valid door opening number, the shorter the normal running defrosting time.

[0014] When the vehicle refrigerator switches from the initial power-on state to the normal running state, the defrosting trigger time threshold is switched from the initial power-on defrosting time to the normal running defrosting time.

[0015] In one of the embodiments, the normal running defrosting time is determined according to the valid door opening number, specifically:

[0016] The valid door opening number is increased by 1, and the normal running defrosting time is reduced by a preset time amount.

[0017] In one of the embodiments, the frost layer melting degree is determined according to the working state of the defrosting sensor, specifically:

[0018] When the working state of the defrosting sensor is normal, the frost layer melting degree is determined according to the output signal of the defrosting sensor;

[0019] When the working state of the defrosting sensor is faulty, the surface temperature of the evaporator is acquired, and the frost layer melting degree is determined according to the temperature rise change from the defrosting heater start time;

[0020] When the temperature rise reaches a preset temperature rise threshold, it is determined that the frost layer has been fully melted.

[0021] In one of the embodiments, the initial power-on defrosting time is dynamically set according to the external temperature of the refrigerator, specifically:

[0022] When the external temperature of the refrigerator is in a first temperature interval, the initial power-on defrosting time is set to a first time threshold;

[0023] When the external temperature of the refrigerator is in a second temperature interval higher than the first temperature interval, the initial power-on defrosting time is set to a second time threshold;

[0024] The first time threshold is less than the second time threshold.

[0025] In one of the embodiments, the current defrosting influence factor parameter includes the current vehicle speed, the current vehicle inclination angle, the current vehicle external humidity, the current refrigerator power, and the current ambient light intensity;

[0026] When the vehicle refrigerator is in the normal running state, the defrosting trigger time threshold is adjusted based on at least one refrigerator running parameter, specifically:

[0027] Based on the current defrosting influence factor parameter, the current vehicle running scene is identified through a preset scene recognition algorithm;

[0028] adjust the defrosting trigger time threshold according to the current vehicle running scene;

[0029] wherein the current vehicle running scene is identified by a preset scene recognition algorithm, comprising:

[0030] obtaining a first speed threshold, a first humidity threshold, a vehicle inclination threshold, a second speed threshold, a power threshold and an illumination threshold;

[0031] when the current vehicle speed is greater than the first speed threshold and the current vehicle external humidity is greater than the first humidity threshold, identifying the current vehicle running scene as a high-speed driving-high temperature and high humidity scene;

[0032] when the current vehicle inclination is greater than the vehicle inclination threshold and the current vehicle speed is less than the second speed threshold, identifying the current vehicle running scene as a bumpy road scene;

[0033] when the current refrigerator power is lower than the power threshold and the current ambient light intensity is greater than the illumination threshold, identifying the current vehicle running scene as a parking charging-sunlight direct scene.

[0034] In one of the embodiments, obtaining the first speed threshold, the first humidity threshold, the vehicle inclination threshold, the second speed threshold, the power threshold and the illumination threshold comprises:

[0035] obtaining an initial threshold set; wherein the initial threshold set includes a first initial speed threshold, a first initial vehicle humidity threshold, a vehicle initial vehicle inclination threshold, a second initial vehicle speed threshold, a power initial vehicle threshold and an illumination initial vehicle threshold;

[0036] obtaining the attenuation state data of the key components of the vehicle; wherein the key components include the air conditioner air duct, the vehicle shock absorber and the power battery;

[0037] generating a corresponding threshold compensation coefficient according to the attenuation state data;

[0038] compensating the initial threshold set according to the threshold compensation coefficient to obtain the first speed threshold, the first humidity threshold, the vehicle inclination threshold, the second speed threshold, the power threshold and the illumination threshold.

[0039] In one of the embodiments, adjusting the defrosting trigger time threshold according to the current vehicle running scene comprises:

[0040] in the high-speed driving-high temperature and high humidity scene, adjusting the defrosting trigger time threshold according to the current frost layer accumulation rate obtained;

[0041] in the bumpy road scene, adjusting the defrosting trigger time threshold according to the vehicle vibration frequency obtained;

[0042] In the parking charging-sunlight direct scene, the defrost triggering time threshold is adjusted according to the current refrigerator power.

[0043] In one of the embodiments, the initial threshold set is determined according to the correlation between the historical defrosting influence factor parameters and the historical frost layer accumulation.

[0044] In the second aspect, the application provides a vehicle-mounted refrigerator, which comprises a controller configured to execute the vehicle-mounted refrigerator intelligent control method described above.

[0045] The vehicle-mounted refrigerator intelligent control method and the vehicle-mounted refrigerator break through the limitation of traditional technology which only relies on a single parameter or a fixed time interval. By allowing the system to obtain at least one of the refrigerator external temperature, the effective door opening times and the current defrosting influence factor parameter as the operating parameter, the flexible adaptation to the variable characteristics of the vehicle-mounted environment is realized. The technical feature of adjusting the defrost triggering time threshold based on these parameters enables the system to automatically optimize the defrosting timing according to different driving conditions, avoiding the problems of delayed defrosting or excessive defrosting under complex working conditions in traditional methods. In particular, the technical feature of determining the frost layer melting degree according to the working state of the defrosting sensor establishes a basic fault-tolerant mechanism. When the system detects abnormal sensor working state, the judgment strategy can be adjusted accordingly to ensure the reliable execution of the defrosting process. Therefore, by combining the selective acquisition of multiple parameters and the adaptive judgment of the sensor state, the vehicle-mounted refrigerator can achieve more accurate and reliable defrosting control in various driving environments, effectively solving the technical problems of poor parameter adaptability, inaccurate defrosting timing judgment and lack of basic fault response capability in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the application or the related art, the following will briefly introduce the drawings needed to be used in the description of the embodiments of the application or the related art. Obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0047] Figure 1 is a flowchart of the vehicle-mounted refrigerator intelligent control method in one of the embodiments;

[0048] Figure 2 is a flowchart of state recognition and threshold adjustment in a vehicle-mounted refrigerator defrosting control method provided by an embodiment of the application;

[0049] Figure 3 is a flowchart of determining the frost layer melting degree based on the sensor working state in a vehicle-mounted refrigerator defrosting control method provided by an embodiment of the application;

[0050] Figure 4 is a flowchart of a scene recognition algorithm based on a defrosting influence factor parameter provided by an embodiment of the present application;

[0051] Figure 5 is a flowchart of a threshold self-adaptive adjustment method provided by an embodiment of the present application. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0053] According to the present embodiment, the vehicle-mounted refrigerator is an intelligent device integrating refrigeration / heat, fan circulation, and various heating auxiliary functions. The core is to perform centralized sensing, decision-making and control on all execution components through a controller (i.e., main control board).

[0054] The main components of the vehicle-mounted refrigerator include:

[0055] Controller (main control board): as the brain of the whole system, it is responsible for receiving data from various sensors, executing the intelligent defrosting control method of the present embodiment, and sending control instructions to various execution components according to logical judgment.

[0056] Compressor: as the core component of refrigeration / heat circulation, it is responsible for transporting heat, and its start / stop and running state is controlled by the controller.

[0057] Internal fan: located inside the refrigerator, it is used to force convection to make the temperature in the box uniform during refrigeration / heat work. Its voltage (speed) and start / stop are controlled by the controller.

[0058] External fan (condensing fan): located outside the refrigerator, it is used to assist the compressor in heat dissipation to ensure efficient refrigeration circulation. Its voltage (speed) and start / stop are controlled by the controller.

[0059] Heating film: located inside the refrigerator, it is used to assist heating or perform micro-heating under certain conditions. Its start / stop is controlled by the controller.

[0060] Defrosting heater: located near the evaporator, it is used to heat the evaporator during the defrosting process to melt the frost layer. Its start / stop and working mode are controlled by the controller.

[0061] Door frame heating wire: located around the door frame of the refrigerator, it is used to prevent the door frame from condensation. Its start / stop is controlled by the controller.

[0062] Water collection box heating wire: located below the defrosting water collection box, it is used to heat the condensate water in the water collection box to speed up evaporation and prevent icing or overflow. Its start / stop and working mode are controlled by the controller.

[0063] Sensor modules: including but not limited to:

[0064] Ambient temperature sensor (refrigerator exterior temperature sensor): used to obtain the current temperature outside the refrigerator.

[0065] Negative temperature coefficient thermistor temperature sensor (NTC temperature sensor): used to measure the temperature inside the refrigerator (e.g. evaporator surface or specific area of the cabinet) at the moment, indicating the actual temperature inside and the frost layer state.

[0066] Defrosting sensor: dedicated to detecting the temperature of the evaporator or defrosting area, assisting in determining the frost layer condition and defrosting exit timing.

[0067] Door switch sensor: used to detect the opening or closing state of the refrigerator door as an input of user behavior and internal heat load change.

[0068] Compressor running power detection module: used to monitor the actual running power of the compressor at the moment.

[0069] The operating principle of the vehicle-mounted refrigerator is that the vehicle-mounted refrigerator system operates under the unified scheduling of the controller. Each sensor continuously feeds back the current data to the controller, including the temperature outside the refrigerator, the NTC sensing temperature inside, the defrosting area temperature, the user's door opening behavior, and the working state of the compressor. The controller adjusts the voltage or start-stop control of the compressor, the inner fan, the outer fan, and various heating elements (heating film, defrosting heater, mouth frame heating wire, water collector heating wire) according to these input data, combined with the preset intelligent control logic and algorithm.

[0070] In the refrigeration / heating mode, the controller mainly regulates the operation of the compressor and the fan to maintain the target temperature; at the same time, according to the environment and use, the auxiliary heating elements such as the mouth frame heating wire will also work accordingly. When the system determines that defrosting is needed, the intelligent defrosting control method of the present application will be triggered, and the controller cooperates with the defrosting heater, fan, etc. to perform defrosting operation, and accurately determines the defrosting exit timing according to the change of NTC sensing temperature. The whole system aims to maximize energy efficiency, optimize internal temperature stability, and ensure reliable operation of the equipment in the variable vehicle-mounted environment.

[0071] The vehicle-mounted refrigerator intelligent control method provided by the embodiment of the present application solves the problems of energy waste and refrigeration performance fluctuation caused by inaccurate defrosting timing of traditional vehicle-mounted refrigerators under complex working conditions, by real-time acquisition of refrigerator operating parameters and dynamic adjustment of defrosting trigger time threshold. This method does not need to increase additional hardware, can adapt to various vehicle operating environments, and can accurately control the defrosting period according to the actual frost accumulation, significantly improving energy utilization and system operation reliability.

[0072] Please refer toFigure 1 The embodiment provides a vehicle-mounted refrigerator intelligent control method, the method is executed by a controller of a vehicle-mounted refrigerator, and the method comprises the following S110-S140.

[0073] S110, a plurality of refrigerator operation parameters of the vehicle-mounted refrigerator are acquired.

[0074] The plurality of refrigerator operation parameters comprise a current defrosting influence factor parameter, a refrigerator external temperature and an effective door opening number in a current refrigeration cycle.

[0075] In the embodiment of the application, the controller acquires the refrigerator operation parameters in a preset sampling period through a plurality of input interfaces configured by the controller. These parameters jointly constitute a multi-dimensional state vector, which can accurately represent the internal working state of the vehicle-mounted refrigerator and the external environmental conditions.

[0076] Specifically, the acquisition of the refrigerator external temperature depends on a negative temperature coefficient (NTC) thermistor electrically connected with an analog-to-digital conversion (ADC) interface of the controller. The thermistor is installed at a specific position of the vehicle-mounted refrigerator body shell, the controller reads the voltage across the thermistor through a voltage dividing circuit, and converts the digital quantity after ADC conversion into a temperature value.

[0077] The effective door opening number in the current refrigeration cycle is monitored and accumulated by a dedicated door opening detection module. The module is composed of a Hall effect sensor installed on the inner side of the refrigerator door frame and a permanent magnet fixed at a corresponding position of the door body. The controller captures the level signal jump through an external interrupt pin in real time, and determines the door opening event with a duration longer than a preset time threshold as an effective door opening.

[0078] The current defrosting influence factor parameter is acquired by the controller from the vehicle communication network through a vehicle controller area network (CAN) bus transceiver module.

[0079] Through multi-dimensional parameter sensing, the controller can construct a complete portrait of the refrigerator operation state, and provide a data basis for subsequent dynamic adjustment of the defrosting strategy. Compared with the traditional scheme which only relies on a single temperature sensor, the method of the embodiment significantly improves the prediction accuracy of the actual frost accumulation.

[0080] S120, based on at least one refrigerator operation parameter, a defrosting trigger time threshold is adjusted.

[0081] The adjusted defrosting time threshold is not lower than a minimum frost interval time threshold.

[0082] In the embodiment of the application, the defrosting trigger time threshold is a core control parameter, and its physical meaning is the total duration of the effective operation of the compressor from the start of the current refrigeration cycle.

[0083] The controller executes a decision algorithm based on the obtained at least one refrigerator operating parameter to dynamically adjust the defrost trigger time threshold. The controller compares the calculated defrost trigger time threshold with a preset minimum defrost interval time threshold, and sets the defrost trigger time threshold to the minimum defrost interval time threshold when the calculated value is less than the minimum threshold.

[0084] By dynamically adjusting the defrost trigger time threshold, the controller can accurately control the defrost timing according to the actual frost layer accumulation rate, avoiding both the decrease in refrigeration efficiency caused by insufficient defrosting and the energy waste caused by excessive defrosting.

[0085] S130, when the compressor operating time accumulated from the start of the current refrigeration cycle reaches the adjusted defrost trigger time threshold, triggering the defrost process.

[0086] In the embodiments of the present application, a compressor operating time counting module is integrated in the controller. The controller accumulates the total duration of the compressor in the power-on operating state by monitoring the control pin state of the compressor power supply relay.

[0087] The controller compares the current accumulated compressor operating time with the determined defrost trigger time threshold in a separate background task. When it is detected that the accumulated operating time reaches the adjusted defrost trigger time threshold, the controller immediately triggers the defrost process.

[0088] After entering the defrost process, the controller interrupts the power supply to the compressor and connects the power supply circuit of the defrost heater. By accurately accumulating the compressor operating time and triggering defrosting when the dynamically adjusted threshold is reached, the controller ensures that the defrosting operation is performed in time when the frost layer accumulation reaches a level that affects the refrigeration efficiency.

[0089] S140, in the defrosting process, determining the frost layer melting degree according to the working state of the defrosting sensor, and keeping or exiting the defrosting process according to the determination result.

[0090] In the embodiments of the present application, the termination condition of the defrosting process is controlled by a separate closed-loop judgment logic.

[0091] The controller monitors the working state of the defrosting sensor in real time. When the defrosting sensor is in a normal working state, the controller determines the frost layer melting degree according to the output signal of the defrosting sensor; when the defrosting sensor is in a fault working state, the controller obtains the evaporator surface temperature and determines the frost layer melting degree according to the change of the evaporator surface temperature.

[0092] When the result of the judgment is that the frost layer has been sufficiently melted, the controller terminates the defrosting process and resumes the refrigeration cycle. By judging the degree of frost melting according to the working state of the defrosting sensor, the controller can reliably terminate the defrosting process under various working conditions, avoiding both the refrigeration efficiency reduction caused by insufficient defrosting and the energy waste caused by excessive defrosting.

[0093] The technical scheme provided by the embodiments of the present application realizes accurate, dynamic and self-adaptive control of the defrosting period by acquiring the refrigerator running parameters in real time and dynamically adjusting the defrosting trigger time threshold. Compared with the prior art using a fixed time threshold, the embodiments of the present application show better effects in terms of energy consumption and system reliability.

[0094] Please refer to Figure 2 The embodiments provide a state recognition and threshold adjustment method for defrosting control of a vehicle-mounted refrigerator, and the method specifically includes the following steps S210-S230.

[0095] S210, when the vehicle-mounted refrigerator is in a first power-on state, determining a first power-on defrosting time according to an external temperature of the refrigerator, and taking the first power-on defrosting time as a defrosting trigger time threshold.

[0096] In the embodiments of the present application, the higher the external temperature of the refrigerator, the shorter the first power-on defrosting time.

[0097] In the embodiments of the present application, the first power-on state refers to a state in which the power supply system of the vehicle-mounted refrigerator is first connected, and the controller detects that a state flag bit in the internal non-volatile memory thereof is an initial value preset at the factory. This state usually occurs when the vehicle-mounted refrigerator is first installed and used or is powered on after a long power-off.

[0098] Specifically, when the vehicle-mounted refrigerator is in the first power-on state, a large amount of water vapor carried in the air and objects in the refrigerator will rapidly condense on the surface of the evaporator at low temperature and form a thick frost layer because the internal temperature of the refrigerator is first reduced from the ambient temperature to the set temperature. The defrosting strategy in this state is mainly to determine the first power-on defrosting time according to the external temperature of the refrigerator. The physical logic is that the higher the ambient temperature, the higher the absolute humidity in the air, and the greater the initial frost amount.

[0099] In the embodiments of the present application, a temperature-time mapping relationship is stored in the internal memory of the controller, and the mapping relationship predefines a nonlinear relationship between the external temperature of the refrigerator and the first power-on defrosting time. When the external temperature of the refrigerator measured by the controller is lower than 10 DEG C, the air is dry, the initial frost amount is small, and the corresponding first power-on defrosting time is set to 24 hours; when the external temperature is between 10 DEG C and 25 DEG C, the first power-on defrosting time is set to 18 hours; and when the external temperature is higher than 25 DEG C, it indicates that the environment is hot and humid, and the initial frost amount is large, and the first power-on defrosting time is set to 12 hours.

[0100] The design principle of this temperature-time mapping relationship is based on the research on the frosting mechanism in the initial cooling process of the refrigerator: in the initial cooling process, the humid hot air in the box body contacts with the surface of the low-temperature evaporator, causing the water vapor to quickly condense into frost. The higher the ambient temperature, the greater the absolute humidity in the air, and the faster the frosting rate, so a shorter defrost trigger time threshold is needed to avoid insufficient defrosting.

[0101] By dynamically setting the initial power-on defrosting time according to the external temperature, the controller can reasonably arrange the defrosting time for the initial frost amount under different environmental conditions, effectively avoiding the problem of insufficient defrosting caused by large initial frost amount due to high environmental temperature, and improving the defrosting success rate in the initial power-on state to more than 98%.

[0102] S220, when the vehicle-mounted refrigerator completes the initial power-on and enters the normal running state, the normal running defrosting time is determined according to the effective door opening times, and the normal running defrosting time is taken as the defrosting trigger time threshold.

[0103] Among them, the more the effective door opening times, the shorter the normal running defrosting time.

[0104] In the embodiments of the present application, the normal running state refers to the state after the vehicle-mounted refrigerator completes the initial cooling process and enters the stable temperature maintenance stage. The controller determines whether the system has entered the normal running state by detecting whether the temperature in the box reaches the set value for the first time and is stably maintained for more than a preset time (for example, 1 hour), and rewrites the state flag bit in the non-volatile memory.

[0105] In the normal running state, the main factor affecting the accumulation of frost changes to the opening and closing of the door caused by the user taking and placing items, and each opening of the door will introduce humid hot air from the outside. Therefore, the adjustment of the defrosting trigger time threshold is mainly based on the effective door opening times in the current refrigeration cycle.

[0106] Specifically, the controller first loads a reference normal running defrosting time value from the non-volatile memory, for example, 20 hours, which represents the defrosting period under the ideal working condition without any door opening behavior. Then, the controller monitors and accumulates the effective door opening times in real time. Each time the effective door opening times is recorded, the controller subtracts a preset time amount from the current normal running defrosting time. In the embodiments of the present application, the preset time amount is optimized and fixed to 30 minutes according to experimental data. Therefore, the controller calculates the adjusted normal running defrosting time in real time by the formula T normal =T base -(N door *T decrement ), where T normal is the adjusted time, T base is the reference time, and N doorT is the accumulated effective opening times in the current period decrement The preset amount of time.

[0107] The design principle of this opening times-defrosting time relationship is based on empirical research on the relationship between user behavior and frost accumulation: each time the door is opened, the humid hot air condenses into frost on the evaporator surface, the more the door is opened, the faster the frost accumulates, and therefore a shorter defrosting trigger time threshold is needed.

[0108] By dynamically adjusting the defrosting trigger time threshold according to the effective opening times, the controller can optimize the defrosting strategy according to the actual use habits of the user, effectively solving the problem of accelerated frost accumulation caused by frequent opening of the door, and reducing the defrosting failure rate in daily use to below 5%.

[0109] S230, when the vehicle-mounted refrigerator switches from the initial power-on state to the normal running state, the defrosting trigger time threshold is switched from the initial power-on defrosting time to the normal running defrosting time.

[0110] In the embodiments of the present application, the state switching operation is a key link to ensure smooth transition of the control strategy. When the controller detects that the temperature in the box first reaches the set value and is stably maintained for more than a preset time (for example, 1 hour), the system determines that the initial cooling process has been completed, and the state flag bit in the non-volatile memory is rewritten from the initial value (for example, 0xFF) to the non-initial value (for example, 0x00), indicating that the system has entered the normal running state.

[0111] At the state switching moment, the controller seamlessly switches the currently effective defrosting trigger time threshold from the initial power-on defrosting time determined according to the external temperature to the normal running defrosting time dynamically calculated according to the effective opening times. For example, if the initial power-on defrosting time is set to 18 hours (corresponding to an external temperature of 25°C), and the accumulated effective opening times at the switching moment are 2 times, then the new defrosting trigger time threshold will be set to 20-(2*0.5)=19 hours. There are essential differences in the frosting mechanism between the initial power-on state and the normal running state, and different defrosting strategies need to be used; but the state switching should not cause a sudden change in the defrosting trigger time threshold, so as to avoid causing unstable system operation.

[0112] In an exemplary embodiment, the normal running defrosting time is determined according to the effective opening times, specifically: for each increase of 1 in the effective opening times, the normal running defrosting time is reduced by a preset amount of time.

[0113] wherein the preset amount of time T decrement is determined based on comprehensive consideration of multiple use scenarios. In the embodiments of the present application, T decrement is determined in the following way: T decrement =k×T ref, where k is the door opening influence coefficient, and k is in the range of 0.02-0.05, T ref is the reference defrosting time, and T base is usually 1 / 24 of T ref .

[0114] For example, when T base is 20 hours, T ref is about 50 minutes, and if k = 0.03, then T decrement = 1.5 minutes. However, considering the need for certain adjustment granularity in actual applications, T decrement is set to 30 minutes in this embodiment, which not only reflects the significant influence of door opening behavior on frost accumulation, but also avoids system oscillation caused by excessively frequent threshold adjustment.

[0115] The quantitative relationship between the number of door openings and the defrosting time is designed based on the principle that the amount of humid hot air introduced by each door opening is relatively fixed, and under the same environmental conditions, the additional frost accumulation caused by each door opening is also relatively fixed. Therefore, the increase in defrosting demand is linearly related to the number of door openings. The controller triggers defrosting in advance by reducing the defrost triggering time threshold to cope with the accelerated accumulation of frost layer caused by door opening.

[0116] In the embodiments of the present application, to ensure system stability, the controller also sets a lower limit protection mechanism. Specifically, the adjusted normal operation defrosting time T normal must not be lower than the minimum defrosting interval threshold T min .

[0117] T normal = max(T base -N door ×T decrement )

[0118] where T min is usually set to 4 hours to ensure the basic operation stability of the refrigeration system and prevent excessive defrosting caused by algorithm misjudgment.

[0119] The technical effect of the embodiments of the present application is derived from the accurate modeling of the relationship between door opening behavior and frost accumulation: by establishing a quantitative relationship between the number of effective door openings and the normal operation defrosting time, the controller can dynamically adjust the defrosting strategy according to the actual use habits of the user. Test data shows that in the user's frequent use scenario (average 10 door openings per day), the defrosting failure rate is reduced from 18.2% of the traditional scheme to 4.7%, the indoor temperature fluctuation amplitude is reduced by 53.8%, and the system energy efficiency is improved by 17.5% after using the method of the present embodiment.

[0120] Please refer to Figure 3The embodiment of the present application provides a method for determining the melting degree of frost layer based on the working state of sensor in the defrosting control method of vehicle-mounted refrigerator, and specifically comprises S310-S320.

[0121] S310, when the working state of the defrosting sensor is normal, determining the melting degree of frost layer according to the output signal of the defrosting sensor.

[0122] In the embodiment of the present application, the defrosting sensor is a pair of NTC thermistors closely attached to different positions of the evaporator, one of which is a measurement resistor and the other is a reference resistor with a small power heating wire. This double sensor design is based on the study of the thermal conductivity characteristics during the melting process of frost layer: the presence of frost layer hinders heat transfer, resulting in a change in temperature difference between the measurement resistor and the reference resistor, which can accurately reflect the thickness of the frost layer.

[0123] Specifically, when the working state of the defrosting sensor is normal, the controller continuously monitors the temperature difference between the two resistors. Due to the presence of frost layer, the temperature rise of the measurement resistor will lag behind the reference resistor with micro-heating, and the thicker the frost layer, the greater the temperature difference between the two. When defrosting, the frost layer gradually melts, the heat conduction improves, and the temperature difference between the two gradually decreases. The controller determines the melting degree of frost layer according to the change of temperature difference: when the temperature difference between the two resistors decreases to below the preset melting completion threshold, it is determined that the frost layer has been fully melted.

[0124] In the embodiment of the present application, the melting completion threshold is set to 0.2℃. This threshold is determined by a large amount of experimental data: when the frost layer is completely melted, the temperature difference between the two resistors will quickly decrease to close to 0℃ due to the good heat conduction performance of the metal surface; while when the frost layer is not completely melted, the temperature difference will remain above 0.5℃. Selecting 0.2℃ as the threshold can ensure that the frost layer is completely melted, and can also avoid excessive defrosting.

[0125] Through the double sensor temperature difference monitoring mechanism, the controller can accurately determine the melting degree of frost layer under the normal working state of the sensor. The actual measurement data shows that after using the method of the embodiment, the accuracy of defrosting termination judgment under the normal working state of the sensor reaches 99.2%, and the fluctuation range of defrosting time is reduced to ±2%, which significantly improves the accuracy of defrosting process.

[0126] S320, when the working state of the defrosting sensor is faulty, obtaining the surface temperature of the evaporator, and determining the melting degree of frost layer according to the temperature rise change of the evaporator surface temperature from the moment when the defrosting heater is turned on.

[0127] When the temperature rise reaches the preset temperature rise threshold, it is determined that the frost layer has been fully melted.

[0128] In the embodiments of the present application, the fault detection of the defrosting sensor working state is a key link to ensure the reliable operation of the system. The controller monitors the working state of the defrosting sensor in real time through the following mechanisms:

[0129] Resistance value range detection: when the resistance value of the measured resistance or the reference resistance exceeds the normal range (for example, less than 1 kΩ or greater than 100 kΩ), it is determined that the sensor is faulty;

[0130] Temperature difference anomaly detection: when the temperature difference between the two sensors continuously exceeds the maximum theoretical temperature difference (for example, 50°C), it is determined that the sensor is faulty;

[0131] Signal stability detection: when the sensor output signal abnormally jumps within a short time (for example, changes by more than 20°C within 1 second), it is determined that the sensor is faulty.

[0132] When the controller determines that the defrosting sensor working state is faulty through the above detection mechanisms, the system automatically switches to a backup judgment logic. Under this logic, the controller obtains the data of the surface temperature sensor installed at the evaporator outlet, records the evaporator surface temperature at the time when the defrosting heater is turned on, and continuously monitors the change of the temperature over time.

[0133] Specifically, the controller calculates the temperature change rate over time (i.e., the temperature rise rate) in real time, and determines the degree of frost melting according to the change of the temperature rise rate. There is a phase change latent heat in the melting process of ice, and its temperature will remain around 0°C for a long time; once the frost layer is completely melted, the temperature of the evaporator metal surface will quickly rise due to continuous heating. Therefore, when the temperature rise rate reaches a preset temperature rise threshold, the controller determines that the frost layer has been completely melted.

[0134] In the embodiments of the present application, the temperature rise threshold is set to 0.5°C / min. This threshold is determined through a large amount of experimental data: when the frost layer is completely melted, the temperature rise rate will quickly increase to more than 0.8°C / min; when the frost layer has not been completely melted, the temperature rise rate is usually less than 0.3°C / min. Selecting 0.5°C / min as the threshold can ensure that the frost layer is completely melted, and can also avoid false judgments caused by temperature fluctuations.

[0135] To improve the reliability of the judgment, the controller uses a multi-point verification mechanism. Specifically, only when the temperature rise rate is greater than the temperature rise threshold for a plurality of consecutive sampling points, it is determined that the frost layer has been completely melted. In the embodiments, the controller requires that the temperature rise rate be greater than 0.5°C / min for 3 consecutive sampling points (with a sampling interval of 10 seconds) to confirm that the frost layer has been completely melted. This mechanism not only ensures the accuracy of the judgment, but also avoids response delays.

[0136] Through the double judgment mechanism, the controller can reliably judge the frost melting degree in the normal and fault states of the defrosting sensor. The measured data shows that in the sensor fault condition, after adopting the backup judgment logic of the embodiment, the defrosting termination judgment accuracy rate reaches 95.6%, which is improved by 32.3 percentage points compared with 72.3% of the traditional fixed time defrosting scheme, and the system reliability is significantly improved.

[0137] In one exemplary example, the initial power-on defrosting time is dynamically set according to the external temperature of the refrigerator, specifically: when the external temperature of the refrigerator is in a first temperature interval, the initial power-on defrosting time is set to a first time threshold; when the external temperature of the refrigerator is in a second temperature interval higher than the first temperature interval, the initial power-on defrosting time is set to a second time threshold.

[0138] The first time threshold is less than the second time threshold.

[0139] In the embodiments of the present application, the first temperature interval and the second temperature interval are set based on the research on the frosting mechanism during the initial cooling process of the refrigerator. When the vehicle-mounted refrigerator is in the initial power-on state, because the internal environment temperature of the refrigerator is first reduced to the set temperature, a large amount of water vapor carried in the air and the goods in the box will rapidly condense on the surface of the evaporator at low temperature and form a frost layer. The higher the ambient temperature, the greater the absolute humidity in the air, and the greater the initial frost amount, so a shorter defrosting trigger time threshold is needed to avoid insufficient defrosting.

[0140] Specifically, the controller divides the external temperature of the refrigerator into multiple temperature intervals, and sets the initial power-on defrosting time for each interval. In the embodiments of the present application, the temperature intervals are divided as follows:

[0141] The first temperature interval: the external temperature of the refrigerator is lower than 10℃;

[0142] In this temperature interval, the air is relatively dry and the water vapor content is low, and the frost layer formed during the initial cooling process is thin. The controller sets the initial power-on defrosting time to a first time threshold, for example, 24 hours. This longer defrosting trigger time threshold avoids premature defrosting due to the thin frost layer in a low temperature environment, thereby reducing unnecessary energy consumption.

[0143] The second temperature interval: the external temperature of the refrigerator is between 10℃ and 25℃;

[0144] In this temperature interval, the air humidity is high, especially in summer or humid areas, and a thick frost layer will rapidly form during the initial cooling process. The controller sets the initial power-on defrosting time to a third time threshold, for example, 12 hours. This shorter defrosting trigger time threshold can timely address the problem of rapid frosting and avoid the decrease of refrigeration efficiency due to insufficient defrosting.

[0145] The correspondence between the temperature interval and the time threshold is designed on the principle that the water vapor content in the air increases significantly with temperature, resulting in different frost layer thicknesses condensed in the same cooling process. By dividing the external temperature into different intervals and setting the corresponding defrosting time, the controller can reasonably arrange the defrosting time for different initial frost amounts under different environmental conditions.

[0146] In the embodiments of the present application, the boundary values of the temperature interval (10℃ and 25℃) are determined by a large amount of experimental data. Experiments show that when the environmental temperature is below 10℃, the absolute humidity of the air is usually below 6g / m³, and the frost layer accumulates slowly during the initial cooling process; when the environmental temperature is between 10℃ and 25℃, the absolute humidity is in the range of 6-15g / m³, and the frost layer accumulates at a moderate speed; when the environmental temperature is higher than 25℃, the absolute humidity usually exceeds 15g / m³, and the frost layer accumulates significantly faster. The setting of these boundary values fully considers the humidity variation law in the actual use environment, ensuring the scientificity and practicality of the temperature interval division.

[0147] In an exemplary embodiment, the current defrosting influence factor parameters include the current vehicle speed, the current vehicle inclination angle, the current vehicle external humidity, the current refrigerator power, and the current environmental light intensity.

[0148] In this embodiment, the controller obtains five types of key defrosting influence factor parameters through the vehicle controller area network (CAN) bus: current vehicle speed: when driving at high speed, the rate of hot and humid air outside the vehicle flowing through the vehicle increases, which may cause more moisture to penetrate into the vehicle through poorly sealed parts, accelerating the rise of humidity in the environment around the refrigerator, and thus accelerating the accumulation of frost layer. Current vehicle inclination angle: the larger the vehicle inclination angle, the more likely it is to be in a bumpy road condition, which may on the one hand accelerate the aging of the sealing strip and cause moisture intrusion, and on the other hand, vibrations of a certain frequency may affect the structure of the frost layer. Current vehicle external humidity: the higher the water vapor content in the air, the thicker the frost layer condensed on the surface of the evaporator, and the faster the frosting rate. Current refrigerator power: in a low power state, the system needs to be prioritized to ensure basic operation to avoid excessive consumption of battery power. Current environmental light intensity: strong light causes the temperature of the vehicle body to rise, which may accelerate the rise of the ambient temperature around the refrigerator, thereby affecting the accumulation rate of the frost layer.

[0149] The controller constructs the above five types of parameters into a multi-dimensional feature vector:

[0150] F=[v, h, θ, SOC, I]

[0151] Where: v is the current vehicle speed (km / h), h is the current vehicle external humidity (%RH), θ is the current vehicle inclination angle (degrees), SOC is the current refrigerator power bus state of charge (%), and I is the current environmental light intensity (lux).

[0152] When the vehicle-mounted refrigerator is in a normal running state, the defrosting trigger time threshold is adjusted based on at least one refrigerator running parameter, specifically: based on the current defrosting influence factor parameter, the current vehicle-mounted running scene is identified through a preset scene recognition algorithm; and the defrosting trigger time threshold is adjusted according to the current vehicle-mounted running scene.

[0153] Among them, the current vehicle-mounted running scene is identified through a preset scene recognition algorithm, as shown in Figure 4 , which includes:

[0154] S410, a first vehicle speed threshold, a first humidity threshold, a vehicle inclination threshold, a second vehicle speed threshold, an electric quantity threshold and an illumination threshold are obtained.

[0155] S420, when the current vehicle speed is greater than the first vehicle speed threshold and the current vehicle external humidity is greater than the first humidity threshold, the current vehicle-mounted running scene is identified as a high-speed driving-high temperature and high humidity scene.

[0156] S430, when the current vehicle inclination is greater than the vehicle inclination threshold and the current vehicle speed is less than the second vehicle speed threshold, the current vehicle-mounted running scene is identified as a bumpy road scene.

[0157] S440, when the current refrigerator electric quantity is lower than the electric quantity threshold and the current ambient light intensity is greater than the illumination threshold, the current vehicle-mounted running scene is identified as a parking charging-sunlight direct incidence scene.

[0158] Specifically, the controller identifies the current vehicle-mounted running scene based on the feature vector F through a preset scene recognition algorithm. Specifically, the controller loads a set of scene discrimination thresholds from the non-volatile memory, including: a first vehicle speed threshold v1: 80 km / h, used to identify a high-speed driving scene; a first humidity threshold h1: 75% RH, used to identify a high temperature and high humidity environment; a vehicle inclination threshold θ t : 5 degrees, used to identify a bumpy road; a second vehicle speed threshold v2: 30 km / h, used to distinguish between low-speed driving and parking state; an electric quantity threshold SOC t : 30% SOC, used to identify a low electric quantity state; an illumination threshold I t : 60,000 lux, used to identify a strong light environment.

[0159] The controller compares the real-time acquired feature vector F with these thresholds to identify the current vehicle-mounted running scene:

[0160] High-speed driving-high temperature and high humidity scene identification: when v>v1 and h>h1, the controller identifies the current vehicle-mounted running scene as a high-speed driving-high temperature and high humidity scene. The physical basis of this identification condition is that when driving at high speed, the speed of the hot and humid air outside the vehicle flowing through the vehicle increases, combined with the high humidity environment, which will cause the humidity of the environment around the refrigerator to increase significantly, accelerating the accumulation of frost.

[0161] bumpy road scenario: when θ>θ t and v<v2, the controller identifies the current vehicle operation scenario as a bumpy road scenario. The physical basis of this identification condition is that a larger vehicle inclination angle usually indicates a bumpy road when driving at low speed, and the severe vibration of the vehicle can accelerate the aging of the sealing strip, leading to more moisture intrusion into the refrigerator.

[0162] parking charging-sunlight direct scenario identification: when SOC<SOC t and I>I t , the controller identifies the current vehicle operation scenario as a parking charging-sunlight direct scenario. The physical basis of this identification condition is that the vehicle may be charging in a low power state, combined with a strong light environment, indicating that the vehicle body is exposed to strong sunlight and the temperature rises.

[0163] In this embodiment, in order to improve the accuracy of scenario identification, the controller uses a classification algorithm based on support vector machine (SVM). Specifically, the controller maps the multi-dimensional feature vector F to a high-dimensional space, and determines the decision boundary through a pre-trained classifier. The classifier is trained through a large amount of real vehicle test data, which can more accurately distinguish different scenarios. For example, for the high-speed driving-high temperature and high humidity scenario, the decision boundary is defined as: 0.6v+0.4h>T1, where T1 is the scenario discrimination threshold, which is optimized through training data.

[0164] In addition, in order to avoid frequent jumps of the scenario identification result, the controller uses a Kalman filter algorithm to smooth the identification result. Specifically, the controller performs weighted averaging on the current identification result and the historical identification result, and the weight decays exponentially over time: S k =αS k-1 +(1-α)S' k , where: S k is the smoothed identification result of the kth iteration, S k-1 is the smoothed identification result of the (k-1)th iteration, S' k is the original identification result of the kth iteration, and a is the smoothing coefficient, which is in the range of 0.7-0.9.

[0165] In an exemplary embodiment, as shown in Figure 5 , obtaining the first vehicle speed threshold, the first humidity threshold, the vehicle inclination angle threshold, the second vehicle speed threshold, the power threshold and the light threshold comprises:

[0166] S510, obtaining the correlation between the historical defrosting influence factor parameters and the historical frost layer accumulation, and determining the initial threshold set according to the correlation.

[0167] The initial threshold set includes a first initial vehicle speed threshold, a first initial vehicle humidity threshold, a vehicle initial vehicle inclination threshold, a second initial vehicle speed threshold, an initial battery power threshold, and an initial light threshold. The initial threshold set is determined according to an association between the historical defrosting influence factor parameters and the historical frost layer accumulation.

[0168] In the embodiments of the present application, the association between the historical defrosting influence factor parameters and the historical frost layer accumulation is obtained in the following manner:

[0169] Data collection: the controller continuously records a sequence of historical defrosting influence factor parameters and corresponding historical frost layer accumulation. The frost layer accumulation is indirectly represented by the defrosting time or energy consumption, for example: the longer the defrosting time, the more serious the frost layer accumulation, and the higher the defrosting energy consumption, the more serious the frost layer accumulation.

[0170] Correlation analysis: the controller uses correlation coefficient analysis and regression analysis to determine the quantitative relationship between the defrosting influence factor parameters and the frost layer accumulation. For example, through analysis, it is found that the product of vehicle speed and humidity is positively correlated with frost layer accumulation (R²=0.87); the ratio of vehicle inclination and vehicle speed is nonlinearly related to frost layer accumulation; the product of battery power and light intensity is negatively correlated with frost layer accumulation; based on the above association, the controller determines the initial threshold set by the K-means clustering algorithm. Specifically, the controller divides the historical data into three categories (no significant influence, moderate influence, and severe influence), and takes the boundary of the middle two categories as the initial threshold.

[0171] In the embodiments of the present application, the determined initial threshold set is: the first initial vehicle speed threshold: 82 km / h, the first initial humidity threshold: 73% RH, the vehicle initial inclination threshold: 4.8 degrees, the second initial vehicle speed threshold: 32 km / h, the initial battery power threshold: 32% SOC, and the initial light threshold: 62000 lux. Through analysis of historical data, the controller can find the best scene discrimination threshold to maximize the accuracy of scene recognition.

[0172] S520, obtaining decay state data of a key component of the vehicle.

[0173] The key components include an air conditioner air duct, a vehicle shock absorber, and a power battery.

[0174] In the embodiments of the present application, the decay state data is obtained from the vehicle gateway through a diagnostic protocol: the air conditioner air duct blockage coefficient D_duct: the value range is 0-1, 0 represents no blockage, and 1 represents complete blockage. The controller obtains the air volume data of the air conditioner system through the diagnostic protocol, compares it with the standard air volume, and calculates the blockage coefficient: D_duct=1-Q / Q0, where Q is the current air volume, and Q0 is the standard air volume.

[0175] Vehicle shock absorber attenuation coefficient D_shock: value range 0~1, 0 represents new state, 1 represents complete failure. The controller analyzes the IMU data to calculate the vibration transmission rate of the vehicle under standard road conditions, compares it with the new vehicle state to determine the attenuation coefficient: D_shock=(T-T0) / T0, where T is the current vibration transmission rate, T0 is the new vehicle vibration transmission rate.

[0176] Power battery health status SOH: expressed in percentage, 100% represents new state. The controller obtains the internal resistance, capacity and other parameters of the battery through the BMS to calculate the health status: SOH=C / C0x100%, where C is the current battery capacity and C0 is the nominal capacity.

[0177] These attenuation state data reflect the performance changes of key components of the vehicle, which have an important influence on the operating environment of the vehicle refrigerator:

[0178] Air duct blockage causes the vehicle's humidity control ability to decline, shock absorber aging causes the vehicle's vibration characteristics to change, and battery aging affects the stability of power supply. By obtaining these attenuation state data, the controller can more accurately assess the current vehicle state and provide a basis for threshold compensation.

[0179] S530, according to the attenuation state data, generate corresponding threshold compensation coefficients.

[0180] In the embodiments of the present application, the generation and application process of the threshold compensation coefficient is as follows:

[0181] Compensation coefficient generation: vehicle inclination threshold compensation coefficient: (1-D_shockx0.35), the higher the shock absorber aging degree, the greater the vehicle vibration under the same road conditions, so the vehicle inclination threshold needs to be correspondingly reduced to more accurately identify the bumpy road scene.

[0182] Humidity threshold compensation coefficient: (1+D_ductx0.22), the higher the air duct blockage degree, the worse the vehicle's humidity control ability, so the humidity threshold needs to be correspondingly increased to more accurately identify the high temperature and high humidity scene.

[0183] Illumination threshold compensation coefficient: (1-(100-SOH) / 100x0.18), the worse the battery health status, the greater the impact of low power state on the system, so the illumination threshold needs to be correspondingly reduced to more accurately identify the parked charging-sunlight direct scene.

[0184] S540, according to the threshold compensation coefficient, compensate the initial threshold set to obtain the first vehicle speed threshold, the first humidity threshold, the vehicle inclination threshold, the second vehicle speed threshold, the power threshold and the illumination threshold.

[0185] Specifically, the controller multiplies the initial threshold value by the compensation coefficient to obtain the final scene discrimination threshold value.

[0186] In an exemplary example, the defrosting trigger time threshold is adjusted according to the current vehicle operating scenario, including:

[0187] (Case 1): In the high-speed driving-high temperature and high humidity scenario, the defrosting trigger time threshold is adjusted according to the obtained current frost layer accumulation rate.

[0188] In the embodiments of the present application, the frost layer accumulation rate is estimated by monitoring the change of the operating duty cycle of the compressor per unit time. When the frost layer accumulates on the surface of the evaporator, its heat conduction performance deteriorates, resulting in a decrease in heat exchange efficiency, and the compressor needs longer time to maintain the temperature in the box, which is manifested as the duty cycle continuously higher than the historical average level.

[0189] The specific adjustment process is as follows:

[0190] Frost layer accumulation rate calculation: the controller calculates the relative change rate of the compressor duty cycle: ΔD=(D k -D h ) / D h ×100%, wherein: D k is the current compressor duty cycle, and D h is the historical average level.

[0191] Rate interval division: the first rate interval: ΔD≤10%, indicating that the frost layer accumulation rate is low, the second rate interval: 10%<ΔD≤20%, indicating that the frost layer accumulation rate is moderate, and the third rate interval: ΔD>20%, indicating that the frost layer accumulation rate is high.

[0192] Defrosting trigger time threshold adjustment: when the frost layer accumulation rate is in the first rate interval, the defrosting trigger time threshold is the first reference time T1 (for example, 17 hours); when the frost layer accumulation rate is in the second rate interval higher than the first rate interval, the defrosting trigger time threshold is the second reference time T2 (for example, 14.45 hours) which is less than the first reference time; when the frost layer accumulation rate is in the third rate interval, the defrosting trigger time threshold is the third reference time T3 (for example, 11.9 hours) which is less than the second reference time.

[0193] The frost layer accumulation rate directly reflects the severity of the current frosting, and by correlating the defrosting trigger time threshold with the frost layer accumulation rate, the controller can accurately adjust the defrosting timing according to the actual frosting condition. In the high-speed driving-high temperature and high humidity environment, the water vapor content in the air is high, and the frosting rate is fast, so a shorter defrosting trigger time threshold is needed to avoid insufficient defrosting.

[0194] (Case 2): In the bumpy road scenario, the defrosting trigger time threshold is adjusted according to the obtained vehicle vibration frequency.

[0195] In the embodiments of the present application, the vehicle vibration frequency is obtained by performing a fast Fourier transform (FFT) on the IMU accelerometer data. Studies have shown that mechanical vibrations of a certain frequency help loosen and shed the frost layer structure.

[0196] The specific adjustment process is as follows:

[0197] Vibration signal acquisition and preprocessing: the controller collects Z-axis acceleration data of the IMU at a sampling frequency of 100 Hz, collects 256 data points each time, and forms a data window. To eliminate the DC offset, the controller performs high-pass filter processing on the data with a cutoff frequency of 0.5 Hz.

[0198] Fast Fourier transform (FFT): the controller performs FFT on the preprocessed data to obtain the frequency domain representation:

[0199]

[0200] Among them, the main vibration frequency and amplitude are determined: the controller finds the frequency point f with the maximum spectral amplitude in the frequency range of 5-20 Hz m , as the main vibration frequency, and records the corresponding amplitude A m .

[0201] Vibration energy calculation: the controller calculates the vibration energy E: E=A m ²×f m , the vibration energy E reflects the degree of influence of vibration on the frost layer structure.

[0202] Defrost triggering time threshold adjustment: when the vibration energy E is in the first energy interval (for example, E≤5.0), the defrost triggering time threshold is the first time length T1 (for example, 17 hours), when the vibration energy E is in the second energy interval higher than the first energy interval (for example, 5.0<E≤8.0), the defrost triggering time threshold is the second time length T2 (for example, 18 hours) greater than the first time length, when the vibration energy E is in the third energy interval (for example, E>8.0), the defrost triggering time threshold is the third time length T3 (for example, 19 hours) greater than the second time length

[0203] The greater the vibration energy, the more obvious the loosening effect on the frost layer, and the refrigeration cycle can be appropriately extended to fully utilize the auxiliary defrosting effect of vibration. At the same time, considering that bumpy road conditions may cause more moisture to invade, the defrost triggering time threshold is also adjusted according to the vibration energy to balance the two opposite effects.

[0204] (Case 3): In the parking charging-sunlight direct irradiation scenario, the defrost triggering time threshold is adjusted according to the current refrigerator power.

[0205] In the embodiments of the present application, the adjustment of the defrosting trigger time threshold is based on the principle of energy management, and the main strategy is to prolong the defrosting trigger time threshold (reduce the defrosting frequency) to maximize the delay of the defrosting operation with high power consumption.

[0206] The specific adjustment process is as follows:

[0207] Electricity interval division: the controller divides the refrigerator power bus electricity state into three intervals: the first electricity interval: SOC> 50%, indicating that the electricity is sufficient; the second electricity interval: 30%<SOC≤50%, indicating that the electricity is medium; the third electricity interval: SOC≤30%, indicating that the electricity is low.

[0208] Defrosting trigger time threshold adjustment: when the current refrigerator electricity is in the first electricity interval, the defrosting trigger time threshold is the third reference time T3 (for example, 17 hours); when the battery state of charge is in the second electricity interval lower than the first electricity interval, the defrosting trigger time threshold is the fourth reference time T4 (for example, 22 hours) greater than the third reference time; when the battery state of charge is in the third electricity interval lower than the second electricity interval, the defrosting trigger time threshold is the fifth reference time T5 (for example, 28 hours) greater than the fourth reference time.

[0209] The specific calculation formula is: T_final=T3×(1+α×(50%-SOC)), where T3 is the third reference time (17 hours), α is the extension coefficient (1.0), and SOC is the current electricity state.

[0210] Illumination intensity compensation: the controller also compensates the defrosting trigger time threshold according to the ambient light intensity I: ΔT=β×(I-I t ), where I t is the light threshold (60000 lux), and β is the light influence coefficient (0.002). The physical basis of this adjustment is that in the low electricity state, the system basic operation needs to be prioritized to avoid excessive consumption of battery energy. By prolonging the defrosting trigger time threshold (reducing the defrosting frequency), the system can significantly reduce the overall energy consumption and prolong the system endurance time.

[0211] This step only involves the adjustment of the defrosting trigger time threshold (i.e., how long the compressor runs before triggering defrosting), and does not involve the adjustment of the defrosting heater working time.

[0212] In actual vehicle operation, multiple scene recognition conditions may be met at the same time. For example, the vehicle may be both driving at high speed (satisfying the high-speed driving-high temperature and high humidity scene) and in a low electricity state (satisfying the parking charging-sunlight direct hitting scene). In this case, the controller needs to make decisions according to the preset scene priority.

[0213] In the embodiments of the present application, the controller adopts a priority processing mechanism based on the importance of the scene: parking charging-sunlight direct scene: highest priority, mainly considering energy management; high-speed driving-high temperature and high humidity scene: second priority, mainly considering refrigeration efficiency; bumpy road scene: lowest priority, mainly considering the influence of vibration.

[0214] When multiple scenes meet the identification conditions at the same time, the controller preferentially adopts the defrosting strategy corresponding to the scene with the highest priority. For example, when the vehicle meets the identification conditions of high-speed driving-high temperature and high humidity scene and parking charging-sunlight direct scene at the same time, the controller preferentially adopts the defrosting strategy of parking charging-sunlight direct scene (extends the defrosting trigger time threshold), because energy management is more important at this time.

[0215] In order to ensure the uniformity of the internal temperature of the vehicle refrigerator and intelligently cooperate according to the refrigeration / heat demand, user operation and special working conditions (such as defrosting), the present embodiment provides a voltage regulation and start-stop control strategy for the internal fan. The strategy aims to optimize the air circulation in the box by adjusting the running state of the internal fan, so as to improve the temperature uniformity, energy efficiency and user experience. The present embodiment describes the voltage regulation and start-stop control strategy for the internal fan of the vehicle refrigerator, aiming to optimize the air circulation in the box and ensure the temperature uniformity and energy efficiency.

[0216] Internal fan voltage control: the controller intelligently adjusts the driving voltage of the internal fan according to the change of the external environment temperature, so as to change its rotating speed. At general or lower external environment temperature, the internal fan runs at a lower rotating speed to save energy and reduce noise. The specific rules are as follows:

[0217] When the external ambient temperature (acquired by the ambient temperature sensor) is below 28°C, the controller outputs 8V voltage to the inner fan. When the external ambient temperature is between 28°C (inclusive) and 41°C (exclusive), the controller outputs 9.6V voltage to the inner fan. When the external ambient temperature is equal to or above 41°C, the controller outputs 12V voltage (full speed) to the inner fan. In addition, when the user turns on the super-speed mode of the vehicle refrigerator, the inner fan will be instructed to run at full speed with 12V voltage regardless of the current external ambient temperature, to maximize the internal air circulation and speed up the refrigeration or heating process. This step voltage control strategy enables the operating efficiency of the inner fan to dynamically match the actual thermal load demand. The inner fan start-stop control: The start and stop of the inner fan is not independent, but closely coordinated with the core working state of the refrigerator and user operation. When the compressor or heating film is working (i.e. the refrigerator is in refrigeration or heating state), the inner fan is automatically turned on to ensure uniform distribution of cold / hot air in the box. Conversely, when neither the compressor nor the heating film is working, the inner fan stops running to avoid unnecessary energy consumption. In order to prevent cold or hot air from quickly flowing out when the door is opened, or to avoid the fan blowing directly at the user, the inner fan will immediately stop working when the door opening sensor detects that the refrigerator door is opened; when the refrigerator door is closed, the inner fan automatically resumes its preset operating state.

[0218] In a specific scenario, i.e. when the defrosting heater is turned on and the heating film is also turned on, the inner fan will also be instructed to start, at which time its role is to assist in evaporating the melted frost or spreading heat to speed up the defrosting process. The role of this embodiment is to ensure efficient circulation of internal airflow, optimize temperature uniformity, and intelligently coordinate according to refrigeration / heating demand, user operation, and special working conditions (such as defrosting), ultimately improving user experience and system energy efficiency. For example, when the outdoor temperature is 35°C in summer, the inner fan of the vehicle refrigerator will run at 9.6V voltage. If the user opens the refrigerator door to take something at this time, the inner fan will immediately stop. When the door is closed, the inner fan resumes running at 9.6V voltage.

[0219] To ensure that the compressor can efficiently dissipate heat under various working conditions and avoid overheating that leads to performance degradation or shortened lifespan, this embodiment provides a voltage regulation and start-stop control strategy for the condensing fan. This strategy aims to optimize the heat dissipation effect of the compressor by adjusting the operating state of the outer fan, and to improve the refrigeration efficiency and compressor lifespan. This embodiment describes the voltage regulation and start-stop control strategy for the outer condensing fan (referred to as outer fan) of the vehicle refrigerator, aiming to optimize the heat dissipation of the compressor and improve the refrigeration efficiency and compressor lifespan.

[0220] External fan voltage control: The controller intelligently adjusts the driving voltage of the external fan according to the change of external ambient temperature, thereby changing its rotation speed. This ensures that the heat dissipation capacity matches the external heat load. The specific rules are as follows: when the external ambient temperature is lower than 32°C, the controller outputs 8V voltage to the external fan. When the external ambient temperature is between 32°C (inclusive) and 41°C (exclusive), the controller outputs 10V voltage (about 83% power) to the external fan. When the external ambient temperature is equal to or higher than 41°C, the controller outputs 12V voltage (full speed) to the external fan. In addition, when the user turns on the extreme speed mode of the car refrigerator, the external fan will also be instructed to run at full speed with 12V voltage to maximize heat dissipation and ensure that the compressor can work at the highest efficiency. In particular, in an extremely high temperature environment (the external ambient temperature is equal to or higher than 46°C), even if the compressor is temporarily started and stopped due to internal control logic, as long as the compressor is in the power-on state, the external fan will continue to work at full speed with 12V voltage to continuously dissipate heat and provide the best heat dissipation conditions for the next start of the compressor. External fan start-stop control: The start-stop of the external fan is closely linked to the running state of the compressor and takes into account the protection mechanism.

[0221] In order to provide pre-heat dissipation for the compressor, when the compressor receives the start command from the main control board, the external fan will first start for a preset time (for example, 10 seconds), and then start the compressor after the heat dissipation environment is ready. In order to dissipate the residual heat after the compressor stops, when the compressor receives the shutdown command from the main control board, the compressor will first shut down, but the external fan will continue to run for a preset delay time (for example, 30 seconds) before shutting down. During the defrosting process, when the defrosting heater is turned on, the external fan will continue to work until the defrosting is completed, and then resume the start-stop rules described above. This continuous operation helps to dissipate heat during defrosting and avoids overheating of the back of the refrigerator. In addition, when the compressor triggers a self-protective shutdown due to power overload and other problems, the external fan will not stop and will continue to run to help the compressor cool down and recover to normal more quickly. The effect of this embodiment is to ensure efficient heat dissipation of the compressor, improve refrigeration efficiency, prolong the service life of the compressor, and optimize system performance under various complex working conditions. For example, when the external ambient temperature is 45°C, the controller instructs the external fan to run at 12V voltage. If the compressor is forced to stop at this time due to high operating power, the external fan will continue to run at 12V voltage until the compressor temperature drops to a safe range.

[0222] As the heart of the car refrigerator, the smooth, efficient and safe operation of the compressor is the key to the performance of the whole system. This embodiment details the start, stop, speed regulation, mode switching optimization and multiple safety strategies of the compressor, aiming to ensure the reliable operation of the compressor in the variable vehicle environment and prolong its service life. This embodiment details the operation control, mode switching optimization and multiple safety protection strategies of the core component of the car refrigerator - the compressor, aiming to ensure the smooth, efficient and safe operation of the compressor and prolong its service life.

[0223] Smooth start and stop: The start process of the compressor is not instantaneous full speed, but adopts a soft start mechanism. Its starting speed is 2500r / min, which gradually and smoothly accelerates to 3000r / min within a preset time (e.g. 60 seconds), which helps to reduce the starting current impact and mechanical wear. After receiving the shutdown signal, the compressor will not be powered off immediately, but will be powered off after a preset time (e.g. 60 seconds) delay, ensuring its smooth shutdown.

[0224] Mode switching and operation limitation: To prevent impact caused by too fast mode switching, the compressor will not start again within a preset time (e.g. 90 seconds) after the end of the heating mode. When the user switches to the extreme speed mode, the compressor will not immediately speed up. It will maintain the original state and run for a preset time (e.g. 60 seconds) before the speed is increased to 3500r / min to maximize efficiency. In any case, the compressor will not start again after a preset safety time (e.g. 90 seconds) after shutdown to prevent damage to the equipment caused by frequent start-stop. When the refrigerator door is opened, the compressor immediately stops to save electricity and prevent unnecessary energy loss.

[0225] High ambient temperature and strong stop control: To cope with the high temperature challenge in complex vehicle environment, the system sets multiple protection levels: when the external environment temperature (ambient temperature) is less than 38℃, but the compressor has been continuously running for a preset time (e.g. 1.5 hours), the compressor is forced to stop for a preset time (e.g. 2 minutes) for rest.

[0226] When first powered on, if the external environment temperature is between 38℃ (inclusive) and 45℃ (exclusive), the compressor continues to run for a preset time (e.g. 8 minutes) before stopping for a preset time (e.g. 90 seconds). If the external environment temperature is equal to or higher than 45℃, the compressor continues to run for a preset time (e.g. 6 minutes) before stopping for a preset time (e.g. 90 seconds). In these high ambient temperature strong stop controls during the first power-on, if the internal NTC sensing temperature reaches its own start-stop control temperature point, the internal NTC start-stop control is executed first, the compressor start time is recalculated, and the strong stop control logic is completely restored to the normal temperature control of the internal NTC after a continuous preset time (e.g. 2 hours).

[0227] Adaptive adjustment under power protection: This is an intelligent self-protection and performance maintenance mechanism. When the controller detects that the operating power of the compressor is greater than or equal to the preset upper power threshold (for example, 110W), the system gradually reduces the operating speed of the compressor by a preset speed step (for example, 200r / s) until the operating power drops to the preset power safety threshold (for example, 100W). After completing the speed reduction and ensuring power stability, the system gradually increases the operating speed again by the same preset speed step, trying to restore to the target speed (for example, 3000r / min, or 3500r / min in the extreme speed mode). If the operating power is again detected to be greater than or equal to the preset upper power threshold during the speed-up process, the above speed reduction and speed-up cycle is repeated to ensure that the compressor always operates within a safe power range while maintaining performance as much as possible. Communication interruption processing: To deal with possible communication instability in the vehicle environment, the system adjusts the communication interruption sleep time between the compressor and the controller from the default value to the preset value (for example, 15 seconds), during which if there is no communication, the compressor will enter the sleep state to protect the equipment. The role of this embodiment is to ensure the smooth, safe, and efficient operation of the compressor under various complex working conditions, prolong its service life, and optimize the overall energy efficiency. For example, in a high-temperature environment, the compressor power detection module reports that its operating power reaches 115W. The controller then instructs the compressor to reduce its speed from 3000r / min to 2800r / min, at which point the power drops to 100W. Subsequently, the system attempts to increase the speed back to 3000r / min.

[0228] To accurately maintain the set temperature inside the vehicle refrigerator and ensure the safe operation of the heating element, this embodiment details the cooperative working strategy of the compressor and the heating film in the refrigeration and heating constant temperature modes, and provides necessary safety protection for the heating film while optimizing the accuracy of temperature data. This embodiment details how the vehicle refrigerator accurately maintains the internal set temperature through the cooperative work of the compressor and the heating film in the refrigeration and heating constant temperature modes, and provides necessary safety protection for the heating film.

[0229] Refrigeration state constant temperature control: When maintaining the temperature inside the refrigerator at the user-set value (target set temperature), the controller makes decisions based on the NTC sensing temperature:

[0230] When the NTC sensing temperature is greater than or equal to the target set temperature plus a preset value (for example, 1°C), the compressor is turned on for refrigeration.

[0231] When the NTC sensing temperature is less than or equal to the target set temperature, the compressor is turned off.

[0232] To prevent the internal temperature from being too low, when the NTC sensing temperature is less than or equal to the set temperature minus a preset value (for example, 2°C), the heating film is turned on for slight heating.

[0233] When the NTC sensed temperature is greater than or equal to the set temperature minus a preset value (e.g. 1℃), the heating film is turned off.

[0234] In the corresponding hysteresis interval (e.g. set temperature - 2℃ < NTC temperature < set temperature - 1℃ or set temperature < NTC temperature < set temperature + 1℃), the compressor and the heating film maintain the previous switching state to avoid frequent start-stop.

[0235] Heating state constant temperature control: when maintaining the internal temperature of the refrigerator at the user set value (target set temperature), the controller makes decisions according to the NTC sensed temperature:

[0236] When the NTC sensed temperature is less than or equal to the set temperature minus a preset value (e.g. 1℃), the heating film is turned on for heating.

[0237] When the NTC sensed temperature is greater than or equal to the set temperature, the heating film is turned off.

[0238] To prevent the internal temperature from being too high, when the NTC sensed temperature is greater than or equal to the set temperature plus a preset value (e.g. 2℃), the compressor is turned on for cooling (heat pump mode or cooling).

[0239] When the NTC sensed temperature is less than or equal to the set temperature plus a preset value (e.g. 1℃), the compressor is turned off.

[0240] In the corresponding hysteresis interval (e.g. set temperature + 1℃ < NTC temperature < set temperature + 2℃ or set temperature - 1℃ < NTC temperature < set temperature), the compressor and the heating film maintain the previous switching state to avoid frequent start-stop.

[0241] In the heating mode, the defrosting heater also performs intermittent work at a preset low voltage (e.g. 6V) to assist heating: it is not turned on when reaching the NTC stop state, and it performs a cycle of 1 minute on and 3 minutes off from the NTC start state.

[0242] Heating film strong stop control: to protect the heating film and optimize energy consumption, the system limits the continuous working time of the heating film:

[0243] When the external environment temperature (ambient temperature) is less than or equal to a preset value (e.g. 12℃), if the continuous working time of the heating film is greater than a preset time length (e.g. 90 minutes), it is forced to stop for a preset time (e.g. 2 minutes) for rest.

[0244] When the external environment temperature (ambient temperature) is greater than or equal to a preset value (e.g. 13℃), if the continuous working time of the heating film is greater than a preset time length (e.g. 50 minutes), it is forced to stop for a preset time (e.g. 2 minutes) for rest.

[0245] When the refrigerator door is opened, the heating film also stops immediately to save electricity.

[0246] Temperature ADC value filtering: To improve the measurement accuracy and stability of all temperature sensors, the ADC values of NTC sensed temperature (and other temperature sensors) are filtered. The controller takes a preset number of samples (e.g., 10) with a preset interval (e.g., 2ms) between each sample, then takes the average after removing the maximum and minimum values.

[0247] The purpose of this embodiment is to ensure accurate control and stability of the internal temperature of the refrigerator, prevent excessive high or low temperature, and protect the heating film while optimizing the accuracy of temperature data. For example, in heating mode, the user sets the target temperature to 50°C. When the NTC sensed temperature drops to 49°C, the heating film is turned on. If the heating film has been working continuously for 55 minutes and the ambient temperature is 20°C, the controller will force the heating film to stop for 2 minutes for rest. To provide a more user-desired internal temperature display and ensure smooth transition of feedback temperature when the system is turned on and off, this embodiment describes a method of adjusting the temperature feedback offset. This method improves user comfort and feedback accuracy through an adaptive compensation mechanism. This embodiment describes how the vehicle-mounted refrigerator adjusts the temperature feedback offset to provide a more user-desired internal temperature display and ensure smooth transition when the system is turned on and off.

[0248] Temperature feedback offset definition and adjustment: The feedback temperature displayed on the user interface is not the NTC sensed temperature directly, but the sum of the feedback offset and the NTC sensed temperature. The feedback offset is initially 0. The offset temperature is the difference between the user's target temperature and the actual controlled set temperature. The system adjusts according to the comparison between the feedback offset and the offset temperature: when the feedback offset is less than the offset temperature, the feedback offset increases at a rate of 1K per 1 minute. When the feedback offset is greater than the offset temperature, the feedback offset decreases at a rate of 1K per 1 minute. When the feedback offset is equal to the offset temperature, the feedback offset remains unchanged. This adjustment mechanism allows the feedback temperature to gradually and smoothly approach the user's desired correction value, improving user comfort. Switching compensation and transition: To ensure smooth transition of feedback temperature when the system is turned on and off, the system is designed with specific compensation logic.

[0249] When the vehicle refrigerator is in OFF state, the compensation temperature (i.e. the target value of the ideal feedback offset) is set to 0. When switching from ON state to OFF state, the current feedback offset will not be instantaneously changed to 0, but gradually approaches 0 at a rate of 1K per 1 minute, achieving smooth shutdown. When the vehicle refrigerator is in ON state, the compensation temperature is determined according to the compensation value defined by the external NTC (ambient temperature sensor) (e.g. the pre-set compensation value at different ambient temperatures). When switching from OFF state to ON state, the feedback offset gradually approaches the compensation temperature at a rate of 1K per 1 minute from 0, achieving smooth startup.

[0250] The effect of this embodiment is to provide a more accurate and comfortable user temperature experience, avoid user confusion caused by sudden changes or inaccuracies in temperature display, and ensure the smoothness of the system when starting and stopping. For example, if the user sets the target temperature to 5°C, but due to system calibration, the actual controlled set temperature is 3°C, the offset temperature is +2K. If the current feedback offset is 0K, the system will increase the feedback offset at a rate of 1K / min until it reaches +2K.

[0251] To prevent condensation in the door frame area and ensure that the vehicle system obtains original and true temperature and humidity data, this embodiment describes the initial delay control strategy of the door frame heating wire and the processing method of temperature and humidity sensor data. This embodiment describes the strategic control of the door frame heating wire of the vehicle refrigerator and the processing method of temperature and humidity sensor data. Delay control of the door frame heating wire: The door frame heating wire is a heating element used to prevent condensation or frost in the door frame area. Its start is not immediate, but has an environment temperature related delay:

[0252] When the external environment temperature is less than or equal to a pre-set value (e.g. 45°C), the door frame heating wire will be turned on after a pre-set delay (e.g. 20 minutes) under the following conditions: first power-on to start refrigeration, switching from heating to refrigeration, or turning on the refrigeration through the key. When the external environment temperature is greater than the pre-set value (e.g. 46°C), the door frame heating wire will be turned on after a longer pre-set delay (e.g. 3 hours) under the same conditions. This delay mechanism aims to strategically enable heating according to the level of condensation risk, avoiding premature heating when the risk is low, thereby saving energy.

[0253] Temperature and humidity sensor compensation: The vehicle refrigerator may be equipped with a temperature and humidity sensor to monitor the temperature and humidity in the vehicle or around the refrigerator. In this embodiment, the data output by the temperature and humidity sensor is not currently compensated, i.e. it is directly output to the vehicle system for use according to the actual measured value of the sensor. This indicates that the system prioritizes providing original, unmodified environmental data to the vehicle control system. The effect of this embodiment is to strategically prevent door frame condensation, balance energy consumption, and ensure that the vehicle system obtains original and true temperature and humidity sensor data.

[0254] For example, the vehicle refrigerator is first powered on in the refrigeration mode, and the external environment temperature is 30℃. The controller will instruct the outer port frame heating wire to start working after 20 minutes. If the vehicle refrigerator is integrated with a humidity sensor, the humidity data measured by the humidity sensor will be directly transmitted to the vehicle master control system.

[0255] To ensure that the defrosting process is efficiently and safely executed in the freezing mode, and to cover all triggering conditions and periodic management details, this embodiment describes the applicable mode of defrosting, complete triggering conditions (including memory function and variable frequency compressor fault diagnosis), and defrosting cycle reset mechanism. The defrosting (automatic defrosting) function of the vehicle refrigerator is designed to remove internal ice and frost to prevent its accumulation from affecting the refrigeration efficiency. The complete cycle of the defrosting process is calculated from the start of the pre-cooling state to the complete exit from the defrosting state. The defrosting heater always executes the preset 12V voltage work during this process.

[0256] Defrosting mode restriction: Defrosting control is only performed when the vehicle refrigerator is in the freezing mode (target temperature less than or equal to 0℃). In the non-freezing mode (target temperature greater than 0℃), defrosting is not performed because frost will not form or have little effect.

[0257] Defrosting triggering mechanism: In addition to the aforementioned triggering conditions based on environmental temperature and door opening times adjustment, this embodiment also includes other defrosting triggering conditions:

[0258] First power-on triggering: When the vehicle refrigerator is first powered on, the controller checks and remembers the compressor cumulative running time before the last power-off. If the cumulative running time before the last power-off plus the running time after the current power-on has reached the preset 4-hour forced defrosting condition, or the total time has reached 4 hours, the defrosting process is triggered, and the 4-hour timer is reset. Thereafter, the first defrosting process after the first power-on will be forcibly triggered when the compressor cumulative running reaches a fixed time (e.g., 4 hours).

[0259] Cumulative running time triggering under normal operation: After the vehicle refrigerator enters normal operation, if the compressor cumulative running time reaches the preset 12 hours, the defrosting process is triggered. To adapt to the user's door opening behavior, the preset 12-hour defrosting period is adjusted according to the number of user door openings, and each cumulative door opening shortens the preset time (e.g., 2 hours), but the adjusted minimum running time must not be lower than the preset value (e.g., 4 hours).

[0260] Variable frequency compressor fault diagnosis triggering: When the controller monitors that the variable frequency compressor of the vehicle refrigerator has occurred a preset number of times (e.g., 4 times) of forced shutdown in succession, the defrosting process will be immediately triggered. In this emergency situation, the defrosting process will omit the execution of the pre-cooling control process to quickly remove potential frost problems.

[0261] Defrost cycle reset: no matter what condition triggers it, every time the defrost cycle ends, all the above-mentioned timers and counters used to calculate the defrost timing (e.g. compressor cumulative running time, user door opening times) will be cleared and start counting again, but the refrigerator door closing time and other timekeeping unrelated to defrosting are not included.

[0262] The role of this embodiment is to ensure comprehensive coverage, timely triggering and precise management of the defrost process under various conditions, and to improve the overall reliability and energy efficiency of the refrigerator. For example, after the power of the vehicle refrigerator is turned on for the first time, the compressor has accumulated 3 hours of running, and the variable frequency compressor has been forced to stop for 4 times in a row due to some reason, the system will immediately start the defrost process and skip the pre-cooling stage.

[0263] To effectively reduce the temperature rise inside the freezer compartment caused by defrosting, this embodiment details the complete method of pre-cooling control before defrosting, including its target, timeout mechanism and exemption under certain conditions. Pre-cooling control is a key step to prepare for the defrost process. Its main purpose is to further reduce the temperature inside the refrigerator (especially the freezer compartment) before the defrost heater starts working, thereby forming a larger cold reserve. In this way, during the defrosting process, even if there is heating operation, the internal temperature rise can be effectively controlled, reducing the impact on stored items.

[0264] Pre-cooling execution logic: when the vehicle refrigerator sends a defrost control start signal, the controller will immediately start the compressor to run. The compressor continues to run, aiming to reduce the internal temperature of the vehicle refrigerator (monitored by NTC sensing temperature) to a preset temperature difference value below the target temperature (e.g. original target temperature minus 5°C). When the internal temperature reaches the target temperature minus the preset temperature difference value, the compressor stops running and the defrost process officially begins. To prevent the pre-cooling process from being extended indefinitely, the system sets a timeout mechanism: if the compressor continues to run for more than a preset time (e.g. 60 minutes), but the internal temperature still fails to reach the target temperature minus the preset temperature difference value, the controller will forcibly stop the compressor and directly enter the freezing defrost control process.

[0265] Precool exemption: In certain cases, the precool control will be exempted. For example, when the vehicle refrigerator defrosts for the first time, the precool control process is not performed. This can be done to shorten the total time from the first start to normal use. Periodic reset: At the end of each defrost cycle, the compressor's running time timer, which is used to calculate the precool timeout (e.g. 60 minutes), is reset to zero so that it can be accurately calculated again at the next defrost. The effect of this embodiment is to effectively reduce the impact of defrosting on the internal temperature of the refrigerator through fine precool management, ensuring the safety of the stored goods and user experience, while avoiding the unnecessary extension of the precool process. For example, before defrosting is triggered, the target temperature is 0°C. The system starts the compressor and tries to reduce the internal temperature to -5°C. If the compressor has been running for 60 minutes but the internal temperature is still only -3°C, the system will stop the compressor and directly enter the defrosting process.

[0266] To ensure that the defrosting process is completed efficiently and safely, this embodiment describes in detail the specific action sequence for entering defrosting after precooling (or precooling exemption), comprehensive defrosting exit conditions (including time thresholds and fault conditions), and orderly recovery actions after exiting defrosting.

[0267] Specific action sequence for entering defrosting: After the precool control process is completed (or in the case of no precooling), the compressor will be stopped. After waiting for a predetermined time (e.g. 1 minute), the internal fan will be turned off. At this time, the controller will check the defrosting sensor temperature. If the defrosting sensor temperature is less than a predetermined value (e.g. 8°C, indicating the presence of frost), the defrosting heater is turned on, officially starting to heat and melt the frost. If the defrosting sensor is diagnosed as faulty, the defrosting heater will be turned on directly without waiting for the temperature condition, ensuring that defrosting can be performed even if the sensor is faulty. Comprehensive defrosting exit conditions: The defrosting process is not performed indefinitely, but will exit when any of the following conditions are met to avoid excessive heating or ensure efficiency:

[0268] Temperature condition: If the defrost sensor temperature reaches or exceeds a preset value (e.g., 8°C, indicating that the frost layer has melted), or the internal NTC sensing temperature reaches or exceeds a preset value (e.g., 8K, also indicating that the frost layer has melted) from the time the defrost heater is turned on, the defrosting is exited. Time condition: If the defrosting duration reaches or exceeds a preset time length (e.g., 25 minutes), the defrosting is exited. This is a bottom-line mechanism to prevent excessive defrosting time due to sensor abnormalities, etc. Fault combined time condition: If the freeze defrost sensor is diagnosed as faulty, and the defrosting duration reaches or exceeds a preset time length (e.g., 20 minutes), the defrosting is exited. This is a time guarantee exit mechanism under sensor failure. Action sequence for exiting defrosting: When any of the exit conditions are met, the system will strictly follow the following sequence to resume normal operation: First step: immediately turn off the defrost heater and stop heating. Second step: after waiting for a preset delay time (e.g., 3 minutes), the compressor resumes normal control and starts working for refrigeration or heating. Third step: after the compressor starts, through a preset recovery time (e.g., 1 minute), the entire control system of the vehicle refrigerator will fully recover to the normal control mode.

[0269] The role of this embodiment is to ensure the integrity, safety, efficiency and robustness of the defrosting process. It avoids potential risks in the defrosting process and achieves smooth system recovery through detailed action sequences and multiple exit conditions. For example, after pre-cooling is completed, the compressor stops, and the internal fan also stops after 1 minute. The defrost heater starts heating. When the defrost sensor reading reaches 8°C, the defrost heater is immediately turned off. After 3 minutes, the compressor starts running. After another 1 minute, the refrigerator fully recovers to normal temperature control.

[0270] To efficiently handle the condensate water generated during defrosting, prevent it from freezing, overflowing or causing odor, this embodiment provides an intelligent management strategy for the water receiving box heating wire, which is closely linked with the defrosting process. The water receiving box heating wire is a heating element located below the defrosting water receiving box, used to heat the condensate water in the water receiving box, accelerate evaporation, and prevent freezing or overflow.

[0271] The working mode is linked with defrosting: the operation mode of the water receiving box heating wire is closely coordinated with the phased state of the defrosting process. Post-defrosting circulation: from the end of the defrosting process, the water receiving box heating wire will execute a kind of intermittent circulation mode: open for a preset time (for example, 9 minutes), and then stop for a preset time (for example, 1 minute). This kind of circulation mode aims to continuously and intermittently heat the water receiving box, ensuring that the residual condensed water can be continuously evaporated. Forced opening during defrosting: specially, when the defrosting control start signal is sent out, the water receiving box heating wire will immediately open and continuously work until the end of the defrosting process. This forced opening ensures that the water receiving box is always in a heating state during the generation of a large amount of condensed water, maximally speeds up the evaporation of the melted water, and prevents excessive water accumulation. After the end of the defrosting process, the water receiving box heating wire will automatically switch back to the above-mentioned intermittent circulation execution mode.

[0272] The role of the embodiment is to ensure efficient treatment of condensed water, prevent icing, clogging or overflow, ensure the smooth progress of the defrosting process and the sanitary condition of the refrigerator, and closely link with the defrosting process. For example, when the defrosting process is started, the water receiving box heating wire immediately opens and continuously works. After the defrosting is completed, the water receiving box heating wire will be circulated in the mode of opening for 9 minutes and stopping for 1 minute until the next defrosting period.

[0273] It should be understood that although each step in the flowchart involved in each of the above embodiments is displayed in sequence according to the direction of the arrow, these steps are not necessarily executed in the order indicated by the arrow. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least part of the steps in the flowchart involved in each of the above embodiments can include multiple steps or stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily sequential, but can be alternately executed with at least part of other steps or steps or stages in other steps.

[0274] Based on the same inventive concept, the embodiment of the present application also provides a vehicle-mounted refrigerator intelligent control method device for implementing the above-mentioned vehicle-mounted refrigerator intelligent control method. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme described in the above method, so the specific limitations in one or more vehicle-mounted refrigerator intelligent control method device embodiments provided below can refer to the limitations of the vehicle-mounted refrigerator intelligent control method described above, which will not be repeated here.

[0275] The modules in the intelligent control method and device of the vehicle-mounted refrigerator can be realized by software, hardware, or a combination thereof, in whole or in part. The modules can be embedded in or independent of a processor in a computer device in hardware form, or stored in a memory in the computer device in software form, so as to be called and executed by the processor to perform the operations corresponding to the modules.

[0276] Based on the same inventive concept, the embodiments of the present application also provide a vehicle-mounted refrigerator. The vehicle-mounted refrigerator comprises a controller, and the controller is configured to execute the intelligent control method of the vehicle-mounted refrigerator.

[0277] In an exemplary embodiment, a computer device is provided, comprising a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the intelligent control method of the vehicle-mounted refrigerator.

[0278] In an embodiment, a computer readable storage medium is provided, which stores a computer program. The computer program is executed by a processor to implement the intelligent control method of the vehicle-mounted refrigerator.

[0279] In an embodiment, a computer program product is provided, comprising a computer program. The computer program is executed by a processor to implement the intelligent control method of the vehicle-mounted refrigerator.

[0280] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer readable storage medium, and when executed, can include the processes of the above-mentioned embodiment methods. In the embodiments provided in the present application, any reference to memory, database or other medium can include at least one of non-volatile memory and volatile memory. The non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical storage, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. The volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration but not limitation, the RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The database involved in the embodiments provided in the present application can include at least one of a relational database and a non-relational database. The non-relational database can include a distributed database based on a block chain, etc., without being limited thereto. The processor involved in the embodiments provided in the present application can be a general processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, an artificial intelligence (AI) processor, etc., without being limited thereto.

[0281] The technical features of the above embodiments can be combined in any way. To make the description concise, not all possible combinations of the technical features in the above embodiments are described, but as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present application.

[0282] The above-described embodiments are merely illustrative of several embodiments of the present application, and the description is relatively specific and detailed, but should not be understood as a limitation on the scope of the patent. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the scope of the present application. Therefore, the scope of protection of the present application should be subject to the appended claims.

Claims

1. A method for intelligent control of a vehicle-mounted refrigerator, characterized in that, The method is executed by a controller of the vehicle refrigerator, and the method comprises: obtaining a plurality of refrigerator operating parameters of the vehicle refrigerator; wherein the plurality of refrigerator operating parameters comprise a current defrosting influencing factor parameter, an external temperature of the refrigerator, and a number of effective door opening times in a current refrigeration cycle; adjusting a defrosting trigger time threshold based on at least one of the refrigerator operating parameters; wherein the adjusted defrosting time threshold is not lower than a minimum defrosting interval time threshold; triggering a defrosting process when a compressor operating time accumulated from the start of the current refrigeration cycle reaches the adjusted defrosting trigger time threshold; and in the defrosting process, determining a frost layer melting degree according to a working state of a defrosting sensor, and keeping or exiting the defrosting process according to a determination result.

2. The defrosting control method of a vehicle refrigerator according to claim 1, characterized by, The method for adjusting the defrosting trigger time threshold based on at least one of the refrigerator operating parameters comprises: when the vehicle refrigerator is in a first power-on state, determining a first power-on defrosting time according to the external temperature of the refrigerator, and taking the first power-on defrosting time as the defrosting trigger time threshold; wherein the higher the external temperature of the refrigerator, the shorter the first power-on defrosting time; when the vehicle refrigerator completes the first power-on and enters a normal operating state, determining a normal operating defrosting time according to the number of effective door opening times, and taking the normal operating defrosting time as the defrosting trigger time threshold; wherein the more the number of effective door opening times, the shorter the normal operating defrosting time; when the vehicle refrigerator switches from the first power-on state to the normal operating state, switching the defrosting trigger time threshold from the first power-on defrosting time to the normal operating defrosting time.

3. The defrosting control method of a vehicle refrigerator according to claim 2, characterized by, The method for determining the normal operating defrosting time according to the number of effective door opening times comprises: the number of effective door opening times is increased by 1, and the normal operating defrosting time is reduced by a preset time amount.

4. The defrosting control method of the in-vehicle refrigerator according to claim 2, characterized by, The method for determining the frost layer melting degree according to the working state of the defrosting sensor comprises: when the working state of the defrosting sensor is normal, determining the frost layer melting degree according to an output signal of the defrosting sensor; when the working state of the defrosting sensor is faulty, obtaining an evaporator surface temperature, and determining the frost layer melting degree according to a temperature rise change of the evaporator surface temperature from a defrosting heater start time; wherein when the temperature rise reaches a preset temperature rise threshold, it is determined that the frost layer has been sufficiently melted. The method for dynamically setting the first power-on defrosting time according to the external temperature of the refrigerator comprises:

5. The defrosting control method for a vehicle refrigerator according to claim 2, characterized by, when the external temperature of the refrigerator is in a first temperature interval, setting the first power-on defrosting time as a first time length threshold; when the external temperature of the refrigerator is in a second temperature interval higher than the first temperature interval, setting the first power-on defrosting time as a second time length threshold; wherein the first time length threshold is smaller than the second time length threshold. The current defrosting influencing factor parameter comprises a current vehicle speed, a current vehicle inclination angle, a current vehicle external humidity, a current refrigerator power, and a current ambient light intensity; when the vehicle refrigerator is in the normal operating state, the method for adjusting the defrosting trigger time threshold based on at least one of the refrigerator operating parameters comprises:

6. The vehicle-mounted refrigerator defrosting control method according to claim 1, characterized by, based on the current defrosting influencing factor parameter, identifying a current vehicle operating scene by a preset scene recognition algorithm; ​ ​ Adjust the defrosting trigger time threshold according to the current vehicle operation scene; The current vehicle operation scene is identified by a preset scene recognition algorithm, including: Obtain a first speed threshold, a first humidity threshold, a vehicle inclination threshold, a second speed threshold, a power threshold, and a light threshold; When the current speed is greater than the first speed threshold and the current external humidity of the vehicle is greater than the first humidity threshold, the current vehicle operation scene is identified as a high-speed driving-high temperature and high humidity scene; When the current vehicle inclination is greater than the vehicle inclination threshold and the current speed is less than the second speed threshold, the current vehicle operation scene is identified as a bumpy road scene; When the current refrigerator power is lower than the power threshold and the current ambient light intensity is greater than the light threshold, the current vehicle operation scene is identified as a parking charging-sunlight direct scene.

7. The vehicle-mounted refrigerator defrosting control method according to claim 6, characterized by, Obtaining a first speed threshold, a first humidity threshold, a vehicle inclination threshold, a second speed threshold, a power threshold, and a light threshold includes: Obtain an initial threshold set; wherein the initial threshold set includes a first initial speed threshold, a first initial humidity threshold, a vehicle initial inclination threshold, a second initial speed threshold, a power initial threshold, and a light initial threshold; Obtain the attenuation state data of the key components of the vehicle; wherein the key components include the air conditioner air duct, the vehicle shock absorber, and the power battery; According to the attenuation state data, a corresponding threshold compensation coefficient is generated; According to the threshold compensation coefficient, the initial threshold set is compensated to obtain a first speed threshold, a first humidity threshold, a vehicle inclination threshold, a second speed threshold, a power threshold, and a light threshold.

8. The car refrigerator defrosting control method of claim 6, wherein, Adjust the defrosting trigger time threshold according to the current vehicle operation scene, including: In the high-speed driving-high temperature and high humidity scene, the defrosting trigger time threshold is adjusted according to the obtained current frost layer accumulation rate; In the bumpy road scene, the defrosting trigger time threshold is adjusted according to the obtained vehicle vibration frequency; In the parking charging-sunlight direct scene, the defrosting trigger time threshold is adjusted according to the current refrigerator power.

9. The vehicle-mounted refrigerator defrosting control method according to claim 7, characterized by, The initial threshold set is determined according to the correlation between the historical defrosting influence factor parameters and the historical frost layer accumulation.

10. A vehicle-mounted refrigerator characterized by comprising: The vehicle-mounted refrigerator includes a controller, and the controller is used to execute the vehicle-mounted refrigerator intelligent control method of any one of claims 1-9.

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