Control method, system and equipment of vehicle-mounted air conditioner and medium

Abstract

The invention provides a control method, system and equipment of a vehicle-mounted air conditioner and a medium, the control method, system and equipment are applied to the vehicle-mounted air conditioner, the vehicle-mounted air conditioner comprises an evaporator and an internal circulation air door, and the control method comprises the steps that when the vehicle-mounted air conditioner is in a dehumidification mode, the environment temperature outside a vehicle and working parameters of the vehicle-mounted air conditioner are obtained; based on the environment temperature, a preset temperature comparison table is read, so that the target temperature of the evaporator is obtained; based on the environment temperature, the target temperature and the actual temperature of the evaporator in the working parameters, whether the evaporator is in an abnormal state or not is judged; and if yes, the opening degree of the internal circulation air door is adjusted based on the target temperature and the actual temperature, so that normal work of the evaporator is guaranteed. The technical problem that the temperature of the evaporator is too low is solved, normal operation of an air conditioner system loop is guaranteed, shutdown of the compressor is avoided, and energy conservation and environment protection are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of automobiles, and particularly to a control method, system, device and medium for a vehicle-mounted air conditioner. Background Art

[0002] In a vehicle-mounted air conditioner, when a user uses the refrigeration or dehumidification function, the compressor starts to operate and refrigerate. However, in spring and autumn when the ambient temperature is relatively low and the refrigeration load of the vehicle-mounted air conditioner is low, the rotational speed of the compressor reaches the lowest but still cannot meet the minimum operating requirements for refrigerant refrigeration, that is, the temperature of the evaporator in the air-conditioning system is too low. In the prior art, to protect the evaporator, the compressor may be forced to stop to raise the temperature of the evaporator, so as to maintain the subsequent normal operation of the vehicle-mounted air conditioner. Frequent shutdown of the compressor will cause large fluctuations in the evaporator temperature, resulting in large fluctuations in the outlet air temperature, affecting the comfort of the passenger compartment, and deteriorating the vehicle NVH (Noise, Vibration, Harshness), and reducing the system stability. In addition, too low evaporator temperature will also increase the heat compensation energy consumption. Therefore, there are areas for improvement. Summary of the Invention

[0003] In view of the above-mentioned disadvantages of the prior art, the purpose of the present invention is to provide a control method, system, device and medium for a vehicle-mounted air conditioner, which is used to solve the technical problem that when the refrigeration load of the vehicle-mounted air conditioner in the prior art is low, even when the compressor operates at the lowest rotational speed, the temperature of the evaporator is still too low.

[0004] To achieve the above object and other related objects, the present invention provides a control method for a vehicle-mounted air conditioner, the vehicle-mounted air conditioner includes an evaporator and an internal circulation air damper, and the control method includes:

[0005] When the vehicle-mounted air conditioner is in the dehumidification mode, obtain the ambient temperature outside the vehicle and the working parameters of the vehicle-mounted air conditioner;

[0006] Read a preset temperature comparison table based on the ambient temperature to obtain the target temperature of the evaporator;

[0007] Based on the ambient temperature, the target temperature, and the actual temperature of the evaporator in the working parameters, determine whether the evaporator is in an abnormal state;

[0008] If so, adjust the opening degree of the internal circulation air damper based on the target temperature and the actual temperature to ensure the normal operation of the evaporator.

[0009] In an embodiment of the present invention, the vehicle air conditioner further includes a compressor; the step of determining whether the evaporator is in an abnormal state based on the ambient temperature, the target temperature, and the actual temperature of the evaporator among the operating parameters includes:

[0010] Calculate the refrigeration load of the vehicle air conditioner based on the ambient temperature and the target temperature;

[0011] Determine whether the evaporator is in an abnormal state according to whether the ambient temperature is within a first preset temperature range, whether the refrigeration load is less than a first preset load, whether the difference between the target temperature and the actual temperature is greater than a preset temperature difference, and whether the rotational speed of the compressor in the operating parameters is at the lowest rotational speed and the duration exceeds a preset time threshold.

[0012] In an embodiment of the present invention, the refrigeration load J satisfies the following formula:

[0013] J=(T env -T target )×m

[0014] wherein, T env represents the ambient temperature, T target represents the target temperature, and m represents the refrigeration air volume when the vehicle air conditioner is in the dehumidification mode.

[0015] In an embodiment of the present invention, the step of adjusting the opening degree of the internal circulation air door based on the target temperature and the actual temperature includes:

[0016] Calculate the temperature deviation according to the target temperature and the actual temperature;

[0017] Input the temperature deviation into a proportional-integral control function to calculate the adjustment amount of the air door opening degree;

[0018] Adjust the opening degree of the internal circulation air door based on the adjustment amount of the air door opening degree.

[0019] In an embodiment of the present invention, the adjustment amount Spi of the air door opening degree satisfies the following formula:

[0020]

[0021] wherein, Kp represents the proportional gain, Ki represents the integral gain, E(k) represents the temperature deviation at the current moment k, represents the cumulative value of the temperature deviations from the beginning to the present.

[0022] In an embodiment of the present invention, the vehicle air conditioner further includes a heater; after the step of adjusting the opening degree of the internal circulation air door based on the adjustment amount of the air door opening degree, the following steps are further included:

[0023] Calculate the intake air temperature of the evaporator based on the current opening degree of the internal circulation air door, the ambient temperature, and the vehicle interior temperature, and the intake air temperature satisfies the following formula:

[0024] T 进气温度 = T 车内温度 × S 内循环 + T env × (1 - S 内循环 )

[0025] Wherein, T 车内温度 represents the vehicle interior temperature, S 内循环 represents the current opening degree of the internal circulation air door, and T env represents the ambient temperature.

[0026] Adjust the heating power of the heater based on the intake air temperature.

[0027] In an embodiment of the present invention, after the step of adjusting the opening degree of the internal circulation air door based on the target temperature and the actual temperature to ensure the normal operation of the evaporator, the following further includes:

[0028] Monitor the working state of the evaporator:

[0029] When the ambient temperature is in the second preset temperature range, and / or the refrigeration load is greater than the second preset load, the evaporator of the vehicle air conditioner exits the abnormal state; wherein, the minimum value of the second preset temperature range is greater than the maximum value of the first preset temperature range, and the second preset load is greater than the first preset load.

[0030] The present invention further provides a control system for a vehicle air conditioner, including:

[0031] A parameter acquisition module, configured to acquire the ambient temperature outside the vehicle and the working parameters of the vehicle air conditioner when the vehicle air conditioner is in the dehumidification mode;

[0032] A target reading module, configured to read a preset temperature comparison table based on the ambient temperature to obtain the target temperature of the evaporator;

[0033] An abnormality determination module, configured to determine whether the evaporator is in an abnormal state based on the ambient temperature, the target temperature, and the actual temperature of the evaporator in the working parameters;

[0034] An opening degree control module, configured to adjust the opening degree of the internal circulation air door based on the target temperature and the actual temperature when the evaporator is in an abnormal state to ensure the normal operation of the evaporator.

[0035] The present invention further provides an electronic device, and the electronic device includes:

[0036] One or more processors;

[0037] A storage device for storing one or more programs, which, when executed by the one or more processors, cause the electronic device to implement the control method of the vehicle air conditioner described in any one of the above.

[0038] The present invention also provides a computer-readable storage medium, on which a computer program is stored, which, when executed by a processor of a computer, causes the computer to execute the control method of the vehicle air conditioner described in any one of the above.

[0039] As described above, a control method, system, device and medium of a vehicle air conditioner of the present invention have the following beneficial effects: By dynamically adjusting the opening degree of the recirculation air damper, introducing warmer air inside the vehicle to mix with the ambient air, increasing the intake air temperature of the blower, indirectly raising the evaporator temperature, ensuring the normal operation of the air conditioning system circuit, avoiding compressor shutdown, and reducing the heat supplement requirement of the heater, energy conservation and environmental protection are achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 Shown is a schematic structural diagram of a vehicle air conditioner in the prior art.

[0041] Figure 2 Shown is a schematic flow diagram of a control method of a vehicle air conditioner provided by an embodiment of the present invention;

[0042] Figure 3 Shown is a block diagram of the structure of a control system of a vehicle air conditioner provided by an embodiment of the present invention.

[0043] Figure 4 Shown is a schematic structural diagram of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0044] The following specific examples illustrate the embodiments of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0045] It should be noted that the illustrations provided in the following embodiments only schematically illustrate the basic concept of the present invention. Therefore, only the components related to the present invention are shown in the drawings, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and proportion of each component in actual implementation can be arbitrarily changed, and the layout type of its components may also be more complex.

[0046] In the following description, a large number of details are explored to provide a more thorough explanation of the embodiments of the present invention. However, it is obvious to those skilled in the art that the embodiments of the present invention can be implemented without these specific details. In other embodiments, well-known structures and devices are shown in the form of block diagrams rather than in detail to avoid making the embodiments of the present invention difficult to understand.

[0047] The present invention provides a control method, system, device, and medium for a vehicle air conditioner, which relates to the field of automotive technology and can be specifically applied to solve the technical problem that when the refrigeration load of the vehicle air conditioner is low, even if the compressor operates at the lowest speed, the temperature of the evaporator is still too low. The present invention indirectly raises the temperature of the evaporator by dynamically adjusting the opening degree of the recirculation air damper, introducing warmer air inside the vehicle to mix with the ambient air, and increasing the intake air temperature of the blower, thereby avoiding compressor shutdown or the need for supplementary heating. The following is a detailed description through specific embodiments.

[0048] Please refer to Figure 1 , in an embodiment of the present invention, the vehicle air conditioner may include a compressor, a condenser, an expansion valve, a dryer, an evaporator 11, a blower 12, a recirculation air damper 13, a heater, and a controller. Among them, the compressor, condenser, expansion valve, dryer, heater, and controller are not shown in Figure 1 . The compressor is the power part of the air conditioning system, responsible for compressing the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant to provide power for the refrigeration cycle. The condenser is used to cool the high-temperature and high-pressure gaseous refrigerant into a high-pressure liquid refrigerant and release heat to the external environment. The expansion valve is used to control the transformation of the refrigerant from high-pressure liquid to low-pressure liquid, reducing the pressure and temperature of the refrigerant and providing low-temperature and low-pressure refrigerant for the evaporator. The dryer is used to store the liquid refrigerant, filter impurities, absorb moisture, prevent the liquid refrigerant from entering the compressor, and protect the compressor. The evaporator 11 can be used for the liquid refrigerant to evaporate and absorb heat, reducing the temperature of the air flowing through the evaporator and realizing cooling inside the vehicle. The blower 12 can be used to drive the air to flow through the evaporator 11 or the heater and send cold air or hot air into the vehicle. The recirculation air damper 13 can be used to control the air flow direction and temperature to achieve mode switching, such as internal circulation, external circulation, etc. The heater can be used to heat the air flowing through the evaporator 11 and provide warm air for the vehicle. The controller can be used to automatically adjust the operating state of the air conditioning system according to user settings and sensor data.

[0049] Please refer to Figure 2 , the present invention provides a control method for a vehicle air conditioner, which is applied to the above vehicle air conditioner and may specifically include the following steps:

[0050] Step S100: When the vehicle air conditioner is in the dehumidification mode, obtain the ambient temperature outside the vehicle and the operating parameters of the vehicle air conditioner;

[0051] Step S200: Based on the ambient temperature, read the preset temperature comparison table to obtain the target temperature of the evaporator;

[0052] Step S300: Based on the ambient temperature, the target temperature, and the actual temperature of the evaporator among the operating parameters, determine whether the evaporator is in an abnormal state;

[0053] Step S400: If so, based on the target temperature and the actual temperature, adjust the opening degree of the internal circulation air door to ensure the normal operation of the evaporator.

[0054] In an embodiment of the present invention, when step S100 is executed, that is, when the vehicle air conditioner is in the dehumidification mode, the ambient temperature outside the vehicle and the operating parameters of the vehicle air conditioner are obtained. Specifically, first, it should be noted that in the refrigeration mode, the compressor compresses the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous state, and then sends it to the condenser to be cooled into a liquid state. Then, it passes through the expansion valve to reduce the pressure and cool down, and finally enters the evaporator to absorb heat and become gaseous, thereby achieving the cooling of the compartment. In the dehumidification mode, the air conditioning system not only needs to cool down but also needs to reduce the humidity in the air. This is usually achieved by cooling the air to condense the water vapor in it into water droplets and discharging them outside the vehicle, and then heating this part of the already dry air to a suitable temperature to avoid passengers feeling too cold. The control method provided by the present invention is applied to the dehumidification mode. In this embodiment, first, the ambient temperature outside the vehicle and the operating parameters of the vehicle air conditioner are obtained to further evaluate the operating state of the vehicle air conditioner based on these data. Among them, the operating parameters of the vehicle air conditioner may specifically include the actual temperature of the evaporator and the rotational speed of the compressor.

[0055] In an embodiment of the present invention, when step S200 is executed, that is, based on the ambient temperature, a preset temperature comparison table is read to obtain the target temperature of the evaporator. Specifically, the temperature comparison table records the target temperature of the evaporator preset by the vehicle air conditioner at various ambient temperatures. The target temperature ensures that the evaporator can effectively remove moisture in the air without excessive cooling, resulting in unnecessary energy consumption or passenger discomfort. In this step, the preset temperature comparison table is read based on the ambient temperature to determine the target temperature of the evaporator. It can be understood that in a higher temperature environment, a lower evaporator temperature may be required to achieve an efficient dehumidification effect; while in a lower temperature condition, a higher evaporator temperature can be allowed to save energy and prevent excessive cooling. For example, when the set temperature inside the vehicle is 20 °C and the ambient temperature outside the vehicle is 10 °C, the corresponding target temperature of the evaporator is 3 °C. Further, the target temperature of the evaporator can also be associated with the humidity outside the vehicle to improve the dehumidification efficiency.

[0056] In an embodiment of the present invention, when step S300 is executed, that is, based on the ambient temperature, the target temperature, and the actual temperature of the evaporator among the working parameters, it is determined whether the evaporator is in an abnormal state. Specifically, the following steps may be included:

[0057] Step S310: Calculate the refrigeration load of the vehicle air conditioner based on the ambient temperature and the target temperature;

[0058] Step S320: Determine whether the evaporator is in an abnormal state according to whether the ambient temperature is within the first preset temperature range, whether the refrigeration load is less than the first preset load, whether the difference between the target temperature and the actual temperature is greater than the preset temperature difference, and whether the rotational speed of the compressor in the working parameters is at the lowest rotational speed and the duration exceeds the preset time threshold.

[0059] In an embodiment of the present invention, when step S310 is executed, that is, based on the ambient temperature and the target temperature, the refrigeration load of the vehicle air conditioner is calculated. Specifically, based on the ambient temperature and the target temperature, the refrigeration load of the vehicle air conditioner is calculated. In this embodiment, the refrigeration load J can satisfy the following formula:

[0060] J = (T env - T target ) × m

[0061] Wherein, T env represents the ambient temperature obtained in step S100, which can reflect the heat load of the external heat source on the air conditioning system, T target represents the target temperature of the evaporator, which is dynamically determined according to the ambient temperature by the preset temperature comparison table, and m represents the refrigeration air volume of the vehicle air conditioner in the dehumidification mode, and its unit is kg / h, representing the air flow delivered by the blower to the evaporator.

[0062] It is understandable that the temperature difference (T env - T evap_target ) is the difference between the ambient temperature and the target temperature of the evaporator, representing the theoretical heat load that needs to be cooled per unit mass of air. The refrigeration load J represents the total heat load demand, that is, the total amount of heat that the system needs to remove from the air. When the value of the refrigeration load J is larger, it indicates a high external heat load and a stronger refrigeration capacity is required (such as in a high-temperature environment). When its value is smaller, it indicates a low external heat load and a weak refrigeration demand (such as in a low-temperature environment).

[0063] In an embodiment of the present invention, when step S320 is executed, that is, according to whether the ambient temperature is within the first preset temperature range, whether the refrigeration load is less than the first preset load, whether the difference between the target temperature and the actual temperature is greater than the preset temperature difference, and whether the rotational speed of the compressor in the working parameters is at the lowest rotational speed and the duration exceeds the preset time threshold, it is determined whether the evaporator is in an abnormal state. Specifically, the following four conditions are jointly used to determine whether the evaporator is abnormal. Condition 1 is whether the ambient temperature is within the first preset temperature range. The first preset temperature range can be set, for example, as 5°C to 25°C, that is, a low-temperature or medium-temperature scenario. In this range, the evaporator is prone to frosting due to overcooling. For example, if the ambient temperature is 10°C, the surface temperature of the evaporator may be close to the freezing point, and key monitoring is required. Condition 2 is that the refrigeration load J is less than the first preset load. When the actual refrigeration load J is lower than the preset threshold, it indicates that the refrigeration capacity of the system is excessive, and the evaporator may be overcooled. Condition 3 is that the difference between the target temperature and the actual temperature of the evaporator is greater than the preset temperature difference, and the preset temperature difference can be set, for example, as 2°C. Condition 4 is that the rotational speed of the compressor is at the lowest rotational speed and the duration exceeds the preset threshold. After the compressor operates at the lowest power for a period of time, the temperature of the evaporator still cannot rise, indicating that the system regulation fails. Among them, the duration threshold for continuous operation can be set, for example, as 30s. In this embodiment, if the above 4 conditions are simultaneously satisfied, it can be determined that the evaporator is in an abnormal state, which may lead to overcooling and frosting, and a protection strategy needs to be triggered.

[0064] In an embodiment of the present invention, when step S400 is executed, that is, if so, based on the target temperature and the actual temperature, the opening degree of the internal circulation air door is adjusted to ensure the normal operation of the evaporator. Specifically, this step dynamically adjusts the opening degree of the internal circulation air door through a proportional-integral (PI) control algorithm to eliminate the deviation between the actual temperature and the target temperature of the evaporator, thereby increasing the temperature of the evaporator. It may include the following steps:

[0065] Step S410: Calculate the temperature deviation according to the target temperature and the actual temperature;

[0066] Step S420: Input the temperature deviation into the proportional-integral control function to calculate the adjustment amount of the air door opening degree;

[0067] Step S430: Adjust the opening degree of the recirculation air damper based on the adjustment amount of the air damper opening degree.

[0068] In an embodiment of the present invention, when step S420 is executed, that is, according to the target temperature and the actual temperature, the temperature deviation is calculated. Specifically, the temperature deviation E(k) can satisfy the following formula:

[0069] E(k) = T target -T actual

[0070] wherein, the temperature deviation E(k) represents the temperature difference amount that needs to be compensated, T target represents the target temperature of the evaporator determined in step S200, and T actual represents the actual temperature of the evaporator at the current moment k. When the temperature deviation E(k) is greater than 0, the refrigeration load needs to be reduced; when the temperature deviation E(k) is less than 0, the refrigeration load needs to be increased.

[0071] In an embodiment of the present invention, when step S420 is executed, the temperature deviation is input into the proportional-integral control function to calculate the adjustment amount of the air damper opening degree. Specifically, proportional-integral (PI) control is performed on the temperature deviation E(k), and the purpose is to output an appropriate opening degree Spi of the recirculation air damper to reduce the temperature difference until it approaches 0. PI control achieves this by combining the proportional and integral actions. Among them, the proportional control is directly proportional to the current error and quickly responds to the change of the error. The integral control is used to accumulate all past errors and eliminate the steady-state error. In this embodiment, the adjustment amount Spi of the air damper opening degree satisfies the following formula:

[0072]

[0073] wherein, Kp represents the proportional gain, which determines the influence degree of the proportional term on the total output; Ki represents the integral gain, which determines the influence degree of the integral term on the total output; E(k) represents the temperature deviation at the current moment k, represents the accumulated value of the temperature deviations at all moments from the beginning to the present.

[0074] In one embodiment of the present invention, when step S430 is executed, that is, based on the adjustment amount of the air damper opening, the opening of the recirculation air damper is adjusted. Specifically, based on the calculated adjustment amount Spi of the air damper opening, the opening of the recirculation air damper is actually adjusted. In this embodiment, the controller of the vehicle air conditioner sends an instruction to the actuator of the recirculation air damper to change the position of the air damper. The actuator can be an electric motor or other types of driving devices, which are responsible for physically moving the air damper blades, thereby changing the air flow rate and direction entering the air conditioning system. It is known that the temperature inside the vehicle is 20°C and the ambient temperature outside the vehicle is 10°C. Increasing the opening of the recirculation air damper will reduce the entry of external low-temperature air, increase the intake air temperature of the evaporator, and thus drive the temperature of the evaporator to rise. While reducing the opening of the recirculation air damper will increase the entry of external low-temperature air, lower the intake air temperature of the evaporator, and thus drive the temperature of the evaporator to decrease. Through the PI control algorithm, the system can accurately adjust the opening of the recirculation air damper according to the real-time temperature deviation and its historical cumulative amount, balance the refrigeration demand of the evaporator and the anti-frost protection, so as to ensure the normal operation of the evaporator.

[0075] Furthermore, as described above, the heater of the vehicle air conditioner is used to heat the air flowing through the evaporator to provide warm air for the vehicle interior. Therefore, after the actual temperature of the evaporator rises to the target temperature, the temperature of the air entering the heater also increases accordingly. At this time, the heating power of the heater can be adjusted based on the intake air temperature of the evaporator. Specifically, the heating power of the heater can be correspondingly reduced to maintain the set temperature inside the vehicle unchanged. In this embodiment, the intake air temperature T of the evaporator 进气温度 can satisfy the following formula:

[0076] T 进气温度 = T 车内温度 ×S 内循环 + T env ×(1 - S 内循环 )

[0077] wherein, T 车内温度 represents the temperature inside the vehicle, S 内循环 represents the current opening of the recirculation air damper, and T env represents the ambient temperature outside the vehicle.

[0078] In one embodiment of the present invention, after the evaporator of the vehicle air conditioner is in an abnormal state, it is also necessary to continuously monitor the working state of the evaporator. Specifically, continuously monitor the ambient temperature T outside the vehicle envand the refrigeration load J. When the ambient temperature is within the second preset temperature range, and / or the refrigeration load is greater than the second preset load, it is confirmed that the evaporator of the vehicle-mounted air conditioner exits the abnormal state. In this embodiment, the minimum value of the second preset temperature range is greater than the maximum value of the first preset temperature range. For example, the second preset temperature range can be set to be greater than 28°C. The second preset load is greater than the first preset load. For example, the second preset load can be set to twice the first preset load.

[0079] Please refer to Figure 4 , the present invention also provides a control system for a vehicle-mounted air conditioner, and this control system corresponds one-to-one with the control method in the above embodiment. This control system may include a parameter acquisition module 21, a target reading module 22, an abnormality determination module 23, and an opening control module 24. The detailed description of each functional module is as follows:

[0080] The parameter acquisition module 21 can be used to acquire the ambient temperature outside the vehicle and the operating parameters of the vehicle-mounted air conditioner when the vehicle-mounted air conditioner is in the dehumidification mode. Further, specifically, the parameter acquisition module 21 first acquires the ambient temperature outside the vehicle and the operating parameters of the vehicle-mounted air conditioner to further evaluate the operating state of the vehicle-mounted air conditioner based on these data. Among them, the operating parameters of the vehicle-mounted air conditioner may specifically include the actual temperature of the evaporator and the rotational speed of the compressor.

[0081] The target reading module 22 can be used to read a preset temperature comparison table based on the ambient temperature to obtain the target temperature of the evaporator. Further, the target reading module 22 is specifically used to read a preset temperature comparison table based on the ambient temperature to determine the target temperature of the evaporator. It can be understood that in a higher temperature environment, a lower evaporator temperature may be required to achieve an efficient dehumidification effect; while in a lower temperature condition, a higher evaporator temperature can be allowed to save energy and prevent excessive cooling. For example, when the set temperature inside the vehicle is 20°C and the ambient temperature outside the vehicle is 10°C, the corresponding target temperature of the evaporator is 3°C.

[0082] The abnormality determination module 23 can be used to determine whether the evaporator is in an abnormal state based on the ambient temperature, the target temperature, and the actual temperature of the evaporator in the operating parameters. Further, the abnormality determination module 23 can specifically be used to calculate the refrigeration load of the vehicle-mounted air conditioner based on the ambient temperature and the target temperature; determine whether the evaporator is in an abnormal state according to whether the ambient temperature is within the first preset temperature range, whether the refrigeration load is less than the first preset load, whether the difference between the target temperature and the actual temperature is greater than the preset temperature difference, and whether the rotational speed of the compressor in the operating parameters is at the lowest rotational speed and the duration exceeds the preset time threshold.

[0083] The opening control module 24 can be used to adjust the opening of the internal circulation air damper based on the target temperature and the actual temperature when the evaporator is in an abnormal state, so as to ensure the normal operation of the evaporator. Further, the opening control module 24 can specifically be used to calculate the temperature deviation according to the target temperature and the actual temperature; input the temperature deviation into the proportional-integral control function to calculate the adjustment amount of the air damper opening; and adjust the opening of the internal circulation air damper based on the adjustment amount of the air damper opening.

[0084] Further, after the evaporator of the vehicle-mounted air conditioner is in an abnormal state, the opening control module 24 is further used to continuously monitor the working state of the evaporator. Specifically, it continuously monitors the ambient temperature T env outside the vehicle and the refrigeration load J. When the ambient temperature is in the second preset temperature range and / or the refrigeration load is greater than the second preset load, the evaporator of the vehicle-mounted air conditioner exits the abnormal state. In this embodiment, the minimum value of the second preset temperature range is greater than the maximum value of the first preset temperature range. The second preset load is greater than the first preset load.

[0085] For the specific limitations on the control system of the vehicle-mounted air conditioner, reference can be made to the limitations on the control method in the above text, which will not be elaborated here. Each module in the above control device can be implemented in whole or in part by software, hardware, and their combination. The above modules can be embedded in the processor in the computer device in hardware form or be independent of it, or can be stored in the memory in the computer device in software form, so that the processor can call and execute the operations corresponding to the above modules.

[0086] An embodiment of the present invention also provides an electronic device, including: one or more processors; a storage device for storing one or more programs, and when the one or more programs are executed by the one or more processors, the electronic device realizes the control method of the vehicle-mounted air conditioner provided in the above various embodiments.

[0087] Please refer to Figure 4 , the electronic device 3 may include a memory 31, a processor 32, and a bus, and may also include a computer program stored in the memory 31 and executable on the processor 32, such as a control program for the vehicle-mounted air conditioner.

[0088] Among them, the memory 31 includes at least one type of readable storage medium, and the readable storage medium includes flash memory, mobile hard disk, multimedia card, card-type memory (such as SD or DX memory, etc.), magnetic memory, magnetic disk, optical disc, etc. The memory 31 can be an internal storage unit of the electronic device 3 in some embodiments, such as the mobile hard disk of the electronic device 3. The memory 31 can also be an external storage device of the electronic device 3 in other embodiments, such as a plug-in mobile hard disk, a Smart Media Card (SMC), a Secure Digital (SD) card, a Flash Card, etc. equipped on the electronic device 3. Further, the memory 31 can also include both the internal storage unit and the external storage device of the electronic device 3. The memory 31 can be used not only to store application software installed on the electronic device 3 and various types of data, such as the control code of the vehicle-mounted air conditioner, etc., but also to temporarily store the data that has been output or will be output.

[0089] The processor 32 can be composed of integrated circuits in some embodiments. For example, it can be composed of a single packaged integrated circuit, or can be composed of multiple integrated circuits with the same or different functions packaged, including the combination of one or more Central Processing Units (CPUs), microprocessors, digital processing chips, graphics processors, and various control chips, etc. The processor 32 is the control core (Control Unit) of the electronic device 3, connecting various components of the entire electronic device 3 through various interfaces and lines, and by running or executing the programs or modules stored in the memory 31 (such as the training program of the fatigue prediction model, etc.), and calling the data stored in the memory 31, to execute various functions of the electronic device 3 and process data.

[0090] The processor 32 executes the operating system of the electronic device 3 and various installed application programs. The processor 32 executes the application program to implement the steps in the above vehicle-mounted air conditioner control method.

[0091] Exemplarily, the computer program can be divided into one or more modules, and the one or more modules are stored in the memory 31 and executed by the processor 32 to complete this application. The one or more modules can be a series of computer program instruction segments capable of completing specific functions, and this instruction segment is used to describe the execution process of the computer program in the electronic device 3. For example, the computer program can be divided into a parameter acquisition module 21, a target reading module 22, an anomaly judgment module 23, and a opening control module 24.

[0092] The integrated unit implemented in the form of software function modules described above can be stored in a computer-readable storage medium, which can be non-volatile or volatile. The above software function modules are stored in a storage medium and include several instructions for causing a computer device (which can be a personal computer, a computer device, or a network device, etc.) or a processor to execute some functions of the control method of the vehicle air conditioner according to various embodiments of the present application.

[0093] In summary, the present invention provides a control method, system, device and medium for a vehicle air conditioner, which relates to the technical field of automobiles and can be used to solve the technical problem that when the refrigeration load of the vehicle air conditioner is low, even if the compressor runs at the lowest speed, the temperature of the evaporator is still too low. The present invention dynamically adjusts the opening degree of the internal circulation air damper, introduces warmer air inside the vehicle to mix with the ambient air, raises the intake air temperature of the blower, indirectly raises the temperature of the evaporator, ensures the normal operation of the air conditioning system loop, avoids compressor shutdown, and reduces the heat supplement requirement of the heater, achieving energy conservation and environmental protection. Therefore, the present invention effectively overcomes various disadvantages in the prior art and has high industrial utilization value.

[0094] The above embodiments are only illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A method for controlling a vehicle air conditioner, characterized in that: The vehicle air conditioner includes an evaporator and an internal circulation damper, and the control method includes: When the vehicle air conditioner is in dehumidification mode, obtain the ambient temperature outside the vehicle and the working parameters of the vehicle air conditioner; Reading a preset temperature comparison table based on the ambient temperature to obtain a target temperature of the evaporator; Based on the ambient temperature, the target temperature, and the actual temperature of the evaporator in the working parameters, determining whether the evaporator is in an abnormal state; If yes, the opening of the internal circulation damper is adjusted based on the target temperature and the actual temperature to ensure the normal operation of the evaporator.

2. The control method of the vehicle air conditioner according to claim 1, characterized in that: The vehicle air conditioner further includes a compressor; the step of judging whether the evaporator is in an abnormal state based on the ambient temperature, the target temperature, and the actual temperature of the evaporator in the working parameters includes: Calculating a cooling load of the vehicle air conditioner based on the ambient temperature and the target temperature; Whether the evaporator is in an abnormal state is determined based on whether the ambient temperature is in a first preset temperature range, whether the refrigeration load is less than the first preset load, whether the difference between the target temperature and the actual temperature is greater than a preset temperature difference, and whether the speed of the compressor in the working parameters is at a minimum speed and the duration exceeds a preset time threshold.

3. The control method of the vehicle air conditioner according to claim 2, characterized in that: The refrigeration load J satisfies the following formula: J=(T env -T target )×m Among them, T env Indicates the ambient temperature, T target represents the target temperature, and m represents the cooling air volume when the vehicle air conditioner is in dehumidification mode.

4. The control method of the vehicle air conditioner according to claim 1, characterized in that: The step of adjusting the opening of the internal circulation damper based on the target temperature and the actual temperature comprises: Calculating a temperature deviation according to the target temperature and the actual temperature; Inputting the temperature deviation into a proportional-integral control function to calculate the damper opening adjustment amount; Based on the damper opening adjustment amount, the opening of the internal circulation damper is adjusted.

5. The control method of the vehicle air conditioner according to claim 4, characterized in that: The damper opening adjustment amount Spi satisfies the following formula: Where Kp represents the proportional gain, Ki represents the integral gain, and E(k) represents the temperature deviation at the current moment k. Indicates the accumulated value of temperature deviation from the beginning to now.

6. The control method of the vehicle air conditioner according to claim 4, characterized in that: The vehicle air conditioner further includes a heater; and after the step of adjusting the opening of the internal circulation damper based on the damper opening adjustment amount, the step further includes: Based on the current opening of the internal circulation damper, the ambient temperature and the temperature inside the vehicle, the intake air temperature of the evaporator is calculated, and the intake air temperature satisfies the following formula: T 进气温度 =T 车内温度 ×S 内循环 +T env ×(1-S 内循环 ) Among them, T 车内温度 represents the interior temperature of the vehicle, S 内循环 Indicates the current opening of the internal circulation damper, T env Indicates the ambient temperature. Based on the intake air temperature, a heating power of the heater is adjusted.

7. The control method of the vehicle air conditioner according to claim 1, characterized in that: After the step of adjusting the opening of the internal circulation damper based on the target temperature and the actual temperature to ensure the normal operation of the evaporator, the method further includes: Monitor the working status of the evaporator: When the ambient temperature is in a second preset temperature range, and / or the refrigeration load is greater than the second preset load, the evaporator of the vehicle air conditioner exits the abnormal state; wherein the minimum value of the second preset temperature range is greater than the maximum value of the first preset temperature range, and the second preset load is greater than the first preset load.

8. A control system for a vehicle air conditioner, characterized in that: include: A parameter acquisition module, used to obtain the ambient temperature outside the vehicle and the working parameters of the vehicle air conditioner when the vehicle air conditioner is in dehumidification mode; A target reading module, used for reading a preset temperature comparison table based on the ambient temperature to obtain a target temperature of the evaporator; an abnormality judgment module, used for judging whether the evaporator is in an abnormal state based on the ambient temperature, the target temperature, and the actual temperature of the evaporator in the working parameters; The opening control module is used to adjust the opening of the internal circulation damper based on the target temperature and the actual temperature when the evaporator is in an abnormal state, so as to ensure the normal operation of the evaporator.

9. An electronic device, characterized in that: The electronic device comprises: one or more processors; A storage device for storing one or more programs, which, when executed by the one or more processors, enables the electronic device to implement the control method of the vehicle air conditioner as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed by a processor of a computer, the computer is caused to execute the control method of the vehicle air conditioner according to any one of claims 1 to 7.

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