Vehicle air conditioner circulation control method, system, equipment, medium and product

Abstract

The invention relates to the technical field of automobile air conditioners, and discloses a vehicle air conditioner circulation control method, system and equipment, a medium and a product.The method comprises the steps that when an air conditioner system of a vehicle is in a demisting and external circulation mode, the air outlet temperature, the air volume of an air blower, the rotating speed of a compressor and the environment temperature of the environment where the vehicle is located are obtained; the sensible heat load of the vehicle is determined based on the blower air volume, the environment temperature and the air outlet temperature; according to the compressor rotating speed, the environment temperature, the air outlet temperature and a preset three-dimensional mapping strategy, the current total refrigerating capacity of the vehicle is determined; based on the current total refrigerating capacity and the sensible heat load, the latent heat load of the vehicle is determined; the relative humidity of the environment where the vehicle is located is determined based on the latent heat load, air blower air volume and air outlet temperature; and if the relative humidity exceeds the dynamic humidity threshold value, an air conditioning system of the vehicle is controlled to be switched from external circulation to internal circulation, and the technical effects of considering the thermal comfort of passengers and reducing the energy consumption of an air conditioner are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile air conditioning, and in particular to a vehicle air conditioner circulation control method, system, device, medium and product. BACKGROUND

[0002] In the field of automobile air conditioning, the current vehicle equipped with a defrosting mode generally adopts a control strategy of forcibly switching to external circulation and continuously running to introduce dry air outside the vehicle for rapid defrosting. However, this strategy has significant defects: the system cannot real-time perceive the dynamic changes of the humidity of the environment outside the vehicle, resulting in that when the environment outside the vehicle itself is in a high-temperature and high-humidity environment, it will still blindly introduce air with high latent heat load. This not only causes the air conditioner compressor to continuously run at high load, resulting in significant energy waste, but also cannot guarantee the heat comfort of the passengers. SUMMARY

[0003] The present application provides a vehicle air conditioner circulation control method, system, device, medium and product, which solves the technical problem of energy waste existing in related air conditioner circulation control, and achieves the technical effect of balancing the heat comfort of passengers and reducing the energy consumption of the air conditioner.

[0004] In order to achieve the above purpose, the main technical scheme adopted by the present application includes: In a first aspect, the present application provides a vehicle air conditioner circulation control method, which comprises: obtaining the outlet temperature of the vehicle, the air volume of the blower, the rotation speed of the compressor and the ambient temperature of the environment where the vehicle is located when the air conditioning system of the vehicle is in a defrosting and external circulation mode; determining the sensible heat load of the vehicle based on the air volume of the blower, the ambient temperature and the outlet temperature; determining the current total refrigerating capacity of the vehicle according to the rotation speed of the compressor, the ambient temperature, the outlet temperature and a preset three-dimensional mapping strategy, the preset three-dimensional mapping strategy being used to represent the calibration relationship between the rotation speed of the compressor, the ambient temperature and the outlet temperature and the total refrigerating capacity; determining the latent heat load of the vehicle based on the current total refrigerating capacity and the sensible heat load; and determining the relative humidity of the environment where the vehicle is located based on the latent heat load, the air volume of the blower and the outlet temperature; if the relative humidity exceeds a dynamic humidity threshold, switching the air conditioning system of the vehicle from external circulation to internal circulation.

[0005] The vehicle air conditioner circulation control method provided by the present application uses the existing sensor signals of the vehicle to real-time calculate the sensible heat and latent heat load in the defrosting and external circulation mode, and then accurately estimates the relative humidity of the environment outside the vehicle without additional hardware cost. By introducing the dynamic humidity threshold based on human comfort as the basis for judgment, the technical effect of intelligently switching the internal and external circulation to reduce the energy consumption of the air conditioner is achieved under the premise of guaranteeing the heat comfort of the passengers.

[0006] Optionally, determining the latent heat load of the vehicle based on the current total refrigerating capacity and the sensible heat load comprises: calculating a difference between the current total refrigerating capacity and the sensible heat load, and determining the difference as the latent heat load of the vehicle.

[0007] By accurately separating and quantifying the latent heat load for dehumidification in the total refrigerating capacity, the abstract "dehumidification intensity" is converted into a calculable energy consumption parameter, providing a data basis for subsequent analysis of energy consumption to infer the ambient humidity.

[0008] Optionally, determining the relative humidity of the environment in which the vehicle is located based on the latent heat load, the air volume of the air blower, and the outlet air temperature comprises: calculating the saturated water vapor pressure at the outlet air temperature; calculating the outlet saturation moisture content based on the saturated water vapor pressure; obtaining the condensation water content per air volume based on the latent heat load, the air volume of the air blower, and the latent heat of vaporization of water; determining the moisture content of the environment in which the vehicle is located based on the outlet saturation moisture content and the condensation water content per air volume; and calculating the relative humidity of the environment in which the vehicle is located based on the moisture content and the ambient temperature.

[0009] By calculating the latent heat load and converting it into the condensation water content per air volume via the constant physical constant of the latent heat of vaporization of water, and combining the outlet saturation moisture content determined by the outlet air temperature, the original moisture content of the ambient air is inferred based on the mass balance relationship that "the moisture of the incoming air is the sum of the moisture of the outgoing air and the condensation water", and the relative humidity is calculated through the thermodynamic relationship between the moisture content and the ambient temperature. A reliable mathematical relationship is established between the measurable thermodynamic parameters inside the system and the external environment humidity that cannot be directly measured, thereby realizing accurate and real-time estimation of the relative humidity of the environment without relying on the humidity sensor outside the vehicle, and providing a key decision basis for subsequent intelligent energy-saving control.

[0010] Optionally, the dynamic humidity threshold is set as follows: obtaining the highest dew point temperature allowed by human comfort; determining a corresponding relative humidity threshold based on the ambient temperature and the highest dew point temperature, and determining the relative humidity threshold as the dynamic humidity threshold.

[0011] By converting the physical standard of human comfort (the highest dew point temperature) into a relative humidity threshold that dynamically changes with the ambient temperature, the abstract human thermal comfort is accurately embedded into the air conditioning control logic, so that the switching decision of the cycle mode is no longer dependent on fixed and rigid humidity set values, but is based on an adaptive comfort model, providing an intelligent judgment basis for realizing the unity of energy saving and comfort.

[0012] Optionally, the method further comprises: the dynamic humidity threshold linearly decreases with the increase of the ambient temperature, and the dynamic humidity threshold decreases by 5% for each 1℃ increase of the ambient temperature.

[0013] By converting the human comfort standard based on dew point temperature into a dynamic humidity threshold that can adapt to changes in ambient temperature, it is ensured that the air conditioning system makes a cycle mode switching decision at any ambient temperature, and can accurately capture the opportunity for energy saving and consumption reduction while ensuring that the passengers are not hot and humid, thereby achieving dynamic unification and collaborative optimization of comfort and economy.

[0014] Optionally, the method further comprises: if the relative humidity exceeds the dynamic humidity threshold and the external circulation mode has lasted for a specified time, controlling the air conditioning system of the vehicle to switch from external circulation to internal circulation.

[0015] By introducing the delay condition of external circulation lasting for a specified time and combining it with the intelligent judgment condition based on humidity to form a collaborative control logic, on the one hand, it is ensured that the system has entered a stable working state before decision making, thereby avoiding control oscillation caused by model transient fluctuations and improving system robustness; on the other hand, the minimum external circulation requirement in the initial defogging mode is prioritized, ensuring the core safety function, and finally achieving energy saving optimization under the premise of safety and stability.

[0016] In a second aspect, an embodiment of the present application provides a vehicle air conditioning circulation control system, the system comprising: an acquisition module configured to acquire an outlet temperature of the vehicle, an air volume of a blower, a compressor speed, and an ambient temperature of an environment in which the vehicle is located when the air conditioning system of the vehicle is in a defogging and external circulation mode; a first processing module configured to determine a sensible heat load of the vehicle based on the air volume of the blower, the ambient temperature, and the outlet temperature; a second processing module configured to determine a current total refrigerating capacity of the vehicle according to the compressor speed, the ambient temperature, the outlet temperature, and a preset three-dimensional mapping strategy, the preset three-dimensional mapping strategy being configured to represent a calibration relationship between the compressor speed, the ambient temperature, the outlet temperature, and the total refrigerating capacity; a third processing module configured to determine a latent heat load of the vehicle based on the current total refrigerating capacity and the sensible heat load, and determine a relative humidity of the environment in which the vehicle is located based on the latent heat load, the air volume of the blower, and the outlet temperature; and a control module configured to control the air conditioning system of the vehicle to switch from external circulation to internal circulation if the relative humidity exceeds a dynamic humidity threshold.

[0017] In a third aspect, an embodiment of the present application provides a computer device, comprising: a memory and a processor, which are in communication connection with each other, and the memory stores computer instructions, and the processor executes the computer instructions to perform the vehicle air conditioning circulation control method described above.

[0018] In a fourth aspect, an embodiment of the present application provides a computer readable storage medium, having stored thereon computer instructions for causing a computer to execute the vehicle air conditioning circulation control method described above.

[0019] In a fifth aspect, an embodiment of the present application provides a computer program product, comprising computer instructions for causing a computer to execute the vehicle air conditioning circulation control method described above. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the specific embodiments or the prior art in the present application, the drawings needed to be used in the specific embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0021] Figure 1 A flow chart of the vehicle air conditioning circulation control method provided by an embodiment of the present application is shown in the figure. Figure 2 A curve graph of the relative humidity threshold changing with the ambient temperature provided by an embodiment of the present application is shown in the figure. Figure 3 A schematic diagram of a vehicle air conditioning circulation control system provided by an embodiment of the present application is shown in the figure. Figure 4 A structural schematic diagram of a computer device provided by an embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0023] In an automobile air conditioning system, fogging of the front windshield is an important problem affecting driving safety. In order to prevent fogging, related vehicle air conditioners are generally provided with a defogging mode. In this mode, the system usually forces the air intake damper to switch to an external circulation state, and introduces dry air outside the vehicle to rapidly reduce the air humidity in the vehicle cabin, thereby achieving the purpose of defogging.

[0024] However, the defogging control strategy in the related art has obvious defects. First, once the system enters the defogging mode, it usually maintains a fixed time or switches back to the inner cycle until the outlet air temperature reaches a certain threshold, and cannot sense the change of the humidity of the environment outside the vehicle in real time. If the environment outside the vehicle is in a high-temperature and high-humidity state (such as a rainy day or a summer in a coastal area), long-time maintenance of the outer cycle not only cannot effectively dehumidify, but also continuously introduces a large amount of humid air into the vehicle, causing the air conditioner compressor to work continuously under high load, resulting in unnecessary energy waste and increasing the energy consumption of the vehicle.

[0025] To optimize this process, a direct solution is to install a humidity sensor outside the vehicle to directly monitor the environmental humidity, so as to intelligently determine whether the inner-outer cycle switching is needed. However, this solution will bring additional hardware cost, and according to industry estimates, the cost of each set of external humidity sensor is about 5 to 10 US dollars, which is a considerable additional cost for the mass-produced automotive industry. In addition, the external humidity sensor is directly exposed to the complex external environment due to its installation position, and is easily affected by rainwater, mud, salt and other pollutants, resulting in a decrease in measurement accuracy and even early failure, and the reliability is difficult to guarantee.

[0026] Therefore, the current mainstream vehicle air conditioning system still generally uses a simple control strategy based on timing or temperature, lacks adaptive adjustment to the environmental humidity, and cannot achieve a dynamic optimal balance between ensuring the defogging effect and reducing the air conditioning energy consumption.

[0027] The vehicle air conditioning cycle control method provided by the embodiments of the present application aims to solve the technical defects that the related art cannot sense the change of the humidity outside the vehicle due to the continuous use of the outer cycle in the defogging mode, resulting in the invalid introduction of external air in a high-humidity environment and causing the air conditioning energy consumption to be too high. By monitoring and judging, the inner cycle is intelligently switched to when the outside of the vehicle is too humid, so as to achieve the purpose of energy saving.

[0028] The embodiments of the present application provide a vehicle air conditioning cycle control method. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that here.

[0029] Reference is made to Figure 1 , Figure 1 The flowchart of the vehicle air conditioning cycle control method provided by the embodiments of the present application is shown in Figure 1 , and the flowchart includes the following steps: Step S1, when the air conditioning system of the vehicle is in a defogging and outer cycle mode, obtaining the outlet air temperature, air volume of the blower, rotation speed of the compressor and the ambient temperature of the environment where the vehicle is located.

[0030] The outlet temperature, the air flow rate of the blower, the rotation speed of the compressor and the ambient temperature can be obtained based on the existing sensors and control network of the vehicle without adding any new hardware. For example, the ambient temperature can be directly measured by an outside temperature sensor installed at the front of the vehicle. The outlet temperature can be directly measured by an outlet temperature sensor installed at the outlet of the evaporator or in the air duct. The air flow rate of the blower can be obtained according to the current blower gear signal, querying the pre-stored "gear-air flow rate" table in the memory, and obtaining the corresponding mass flow rate value in kg / s, which is calibrated by previous wind tunnel bench tests. The rotation speed of the compressor can be directly read from the data frame broadcast by the compressor controller through the CAN bus.

[0031] Step S3, determining the sensible heat load of the vehicle based on the air flow rate of the blower, the ambient temperature and the outlet temperature.

[0032] In the automotive air conditioning system, the air flow rate of the blower is used to represent the total amount of air to be processed. The difference between the ambient temperature and the outlet temperature represents the magnitude of the cooling. The sensible heat load refers to the cooling capacity consumed by the air conditioning system to reduce the air temperature. The latent heat load refers to the cooling capacity consumed by the air conditioning system to remove moisture in the air.

[0033] The calculation formula of the sensible heat load Qs is as follows: Qs=M×Cp×(Te-Ts) In the above formula, M represents the air flow rate of the blower; Cp represents the specific heat capacity of air at constant pressure, which is a fixed physical constant and can be taken as 1.006 kJ / kg·K; Te represents the ambient temperature; and Ts represents the outlet temperature.

[0034] Step S5, determining the current total refrigeration capacity of the vehicle according to the rotation speed of the compressor, the ambient temperature, the outlet temperature and a pre-set three-dimensional mapping strategy, wherein the pre-set three-dimensional mapping strategy is used to represent the calibration relationship between the rotation speed of the compressor, the ambient temperature, the outlet temperature and the total refrigeration capacity.

[0035] The current total refrigeration capacity refers to the total refrigeration power actually generated by the vehicle air conditioning system under the current operating condition. The total refrigeration capacity includes the sensible heat load for cooling and the latent heat load for dehumidification. The preset three-dimensional mapping strategy is calibrated through a series of precise and strict bench tests. For example, by systematically changing the ambient temperature Te (for example, 25℃, 30℃, 35℃, 40℃), the outlet air temperature Ts (for example, 5℃, 10℃, 15℃) and the compressor speed Rc (for example, 1000 to 6000 rpm, with a step of 500 rpm), after the system is stable, the actual refrigeration capacity Qt (kW) under each group of working conditions is accurately measured by using the enthalpy difference method before and after the evaporator, thereby forming a database covering all common working conditions, i.e. a three-dimensional mapping database. By inputting (Rc, Te, Ts) in real time, interpolation or matching in the database can quickly and accurately obtain the current total refrigeration capacity Qt.

[0036] In step S7, the latent heat load of the vehicle is determined based on the current total refrigeration capacity and the sensible heat load, and the relative humidity of the environment in which the vehicle is located is determined based on the latent heat load, the air volume of the air blower and the outlet air temperature.

[0037] The latent heat load, i.e. the power consumed for dehumidification, can be obtained by subtracting the sensible heat load from the current total refrigeration capacity. It is found through a large number of tests that in the defogging mode, the outlet air cooled by the evaporator has a very high relative humidity (≥95%), which can be approximately considered as saturated wet air. This is a premise assumption of the vehicle air conditioning cycle control method provided by the embodiments of the present application. Since the outlet air is saturated, the moisture content of the saturated air at the outlet air temperature can be accurately calculated, and combined with the condensed water, the moisture content of the environment outside the vehicle can be obtained. According to the thermodynamic principle, the relative humidity of the air can be uniquely determined by knowing the temperature and moisture content of the air.

[0038] Through the above calculation method, the relative humidity of the environment outside the vehicle can be accurately estimated without relying on the humidity sensor outside the vehicle.

[0039] In step S9, if the relative humidity exceeds the dynamic humidity threshold, the air conditioning system of the vehicle is switched from the external cycle to the internal cycle.

[0040] The dynamic humidity threshold is automatically adjusted with the change of the ambient temperature, for the purpose of guaranteeing the thermal comfort of the human body. When the estimated relative humidity of the environment exceeds the dynamic humidity threshold, it means that the current air outside the vehicle has reached an uncomfortable state of "high temperature and high humidity". Such "high temperature and high humidity" air contains a large amount of latent heat load. If the external circulation continues to be used, the air conditioner compressor needs to consume a large amount of energy to condense the excess moisture in the air, which will cause energy waste. In this case, the system automatically switches to internal circulation, avoiding the invalid introduction of external air with high latent heat load, achieving the dual goals of guaranteeing the comfort of the passengers and reducing the energy consumption of the air conditioner.

[0041] The vehicle air conditioner circulation control method provided by the embodiments of the present application utilizes the existing sensor signals of the vehicle to calculate the sensible heat and latent heat load in real time in the defrosting and external circulation modes, and then accurately estimates the relative humidity of the environment outside the vehicle without additional hardware cost. By introducing a dynamic humidity threshold based on the comfort of the human body as the basis for judgment, the technical effect of intelligently switching the internal and external circulation to reduce the energy consumption of the air conditioner under the premise of guaranteeing the thermal comfort of the passengers is achieved.

[0042] In some specific embodiments, based on the current total refrigerating capacity and the sensible heat load, the latent heat load of the vehicle is determined, including: calculating the difference between the current total refrigerating capacity and the sensible heat load, and determining the difference as the latent heat load of the vehicle.

[0043] The latent heat load refers to the cooling capacity consumed by the air conditioner system for condensing and dehumidifying the moisture in the air. Based on the most basic energy conservation principle of the air conditioner system, the total refrigerating capacity is accurately divided into two components: sensible heat (for cooling) and latent heat (for dehumidification). By accurately separating and quantifying the latent heat load for dehumidification in the total refrigerating capacity, the abstract "dehumidification intensity" is converted into a calculable energy consumption parameter, providing a data basis for subsequent analysis of energy consumption to deduce the environmental humidity.

[0044] Specifically, the calculation formula of the latent heat load is: Ql=Qt-Qs In the above formula, Ql represents the latent heat load; Qt represents the current total refrigerating capacity; Qs represents the sensible heat load.

[0045] In some embodiments, based on the latent heat load, the air volume of the air blower, and the outlet air temperature, determining the relative humidity of the environment in which the vehicle is located comprises: calculating the saturated water vapor pressure at the outlet air temperature; based on the saturated water vapor pressure, calculating the outlet air saturation moisture content; based on the latent heat load, the air volume of the air blower, and the latent heat of vaporization of water, obtaining the condensation water content per unit air volume; based on the outlet air saturation moisture content and the condensation water content per unit air volume, determining the moisture content of the environment in which the vehicle is located; and based on the moisture content and the ambient temperature, calculating the relative humidity of the environment in which the vehicle is located.

[0046] The saturated water vapor pressure refers to the pressure generated by the water vapor part when the air reaches a saturated state at a certain temperature. Based on the standard formula recommended by the World Meteorological Organization, the saturated water vapor pressure at different temperatures can be calculated. The latent heat of vaporization of water refers to the heat absorbed by water when it changes from a liquid state to a gaseous state. The moisture content of the environment is the sum of the outlet air saturation moisture content and the condensation water content per unit air volume.

[0047] By calculating the latent heat load and converting it into the condensation water content per unit air volume through the constant physical constant of the latent heat of vaporization of water, and combining the outlet air saturation moisture content determined by the outlet air temperature, the original moisture content of the ambient air is inversely deduced based on the mass balance relationship that "the moisture content of the incoming air is the sum of the moisture content of the outgoing air and the condensation water", and the relative humidity is calculated through the thermodynamic relationship between the moisture content and the ambient temperature. A reliable mathematical relationship is established between the measurable thermodynamic parameters inside the system and the external environment humidity which cannot be directly measured, thereby realizing accurate and real-time estimation of the relative humidity of the environment without relying on the vehicle external humidity sensor, and providing a key decision basis for subsequent intelligent energy-saving control.

[0048] Specifically, based on the engineering assumption that "in the defrosting mode, the evaporator outlet air is close to saturation", first, the saturated water vapor pressure Psat(Ts) at the outlet air temperature Ts is calculated, and the standard formula recommended by the World Meteorological Organization is as follows: In the above formula, Psat(T) represents the saturated water vapor pressure (unit: Pa), and T is the absolute temperature.

[0049] Subsequently, the outlet air saturation moisture content Ws is calculated, and the calculation formula is as follows: Ws=0.622×Psat(Ts) / (P_atm-Psat(Ts)) In the above formula, P_atm is the standard atmospheric pressure; and 0.622 is the ratio of the molar mass of dry air to the molar mass of water vapor.

[0050] Based on the law of conservation of mass, the moisture content of the ambient air We is calculated as follows: We = Ws + Ql / (M x hfg) In the above formula, hfg is the latent heat of vaporization of water, and is 2501 kJ / kg; Ql / (M x hfg) represents the condensation water content per unit of air volume.

[0051] The ambient humidity content We is converted into the ambient relative humidity RH_env, and the calculation formula is as follows: RH_env = (We x P_atm) / (0.622 x Psat(Te)) x 100% In the above formula, Psat(Te) is the saturated water vapor pressure corresponding to the ambient temperature Te.

[0052] In some specific embodiments, the dynamic humidity threshold is set in the following manner: obtaining the highest dew point temperature allowed by human comfort; determining the corresponding relative humidity threshold according to the ambient temperature and the highest dew point temperature, and determining the relative humidity threshold as the dynamic humidity threshold.

[0053] The highest dew point temperature refers to the upper limit of the dew point temperature that a human body can tolerate in a summer environment and still feel comfortable for a long time, based on scientific research on human thermal comfort (such as the ASHRAE 55 standard). The relative humidity threshold is a value that changes dynamically with the ambient temperature, and based on the approximate calculation formula of the dew point temperature, an approximate relationship between the ambient temperature, the relative humidity, and the dew point temperature can be obtained. Through the highest dew point temperature and the ambient temperature, the corresponding relative humidity threshold, i.e., the dynamic humidity threshold, can be obtained.

[0054] By converting the physical standard of human comfort (the highest dew point temperature) into a core control parameter (the relative humidity threshold) that changes dynamically with the ambient temperature, the abstract human thermal comfort is accurately embedded into the air conditioning control logic, so that the switching decision of the cycle mode is no longer dependent on a fixed and rigid humidity setting value, but is based on an adaptive comfort model, providing an intelligent judgment basis for realizing the unity of energy saving and comfort.

[0055] Specifically, the approximate formula of the dew point temperature is as follows: In the above formula, T d is the dew point temperature, Te is the ambient temperature, and RH is the relative humidity value.

[0056] wherein the highest dew point temperature is set to 24 degrees, and thus the calculation formula of the relative humidity threshold is as follows: In the above formula, RH th is the relative humidity threshold. Please refer to Figure 2 , Figure 2A curve of the relative humidity threshold value provided by the embodiment of the present application with the change of the ambient temperature. As shown in Figure 2 , the relative humidity threshold value linearly decreases with the increase of the ambient temperature.

[0057] In some specific embodiments, the dynamic humidity threshold value linearly decreases with the increase of the ambient temperature, and the dynamic humidity threshold value decreases by 5% for each 1℃ increase of the ambient temperature.

[0058] The dynamic humidity threshold value linearly decreases with the increase of the ambient temperature, and the slope is -5% / ℃. Through this precise mathematical relationship, the human comfort standard based on the dew point temperature is converted into a dynamic humidity threshold value that can adapt to the change of the ambient temperature, ensuring that the air conditioning system can accurately capture the opportunity of energy saving and consumption reduction under the premise of ensuring the comfort of the passengers under any ambient temperature, and realizing the dynamic unification and synergistic optimization of comfort and economy.

[0059] In some specific embodiments, if the relative humidity exceeds the dynamic humidity threshold value and the external circulation mode has lasted for a specified time, the air conditioning system of the vehicle is controlled to switch from external circulation to internal circulation.

[0060] By introducing the delay condition of the external circulation lasting for a specified time (for example, 60 seconds), and combining with the intelligent judgment condition based on humidity, a synergistic control logic is formed, which on the one hand ensures that the system has entered a stable working state before decision-making, thereby avoiding control oscillation caused by model transient fluctuations and improving system robustness; on the other hand, it prioritizes the minimum external circulation requirement in the initial defogging mode, ensuring the core safety function, and finally realizes energy saving optimization under the premise of safety and stability.

[0061] Correspondingly, please refer to Figure 3 , Figure 3 A schematic diagram of a vehicle air conditioning circulation control system provided by the embodiment of the present application is shown in Figure 3As shown, the system comprises: an acquisition module, configured to acquire, when the air conditioning system of the vehicle is in a defrosting and external circulation mode, an outlet temperature of the vehicle, an air volume of an air blower, a rotating speed of a compressor, and an ambient temperature of an environment where the vehicle is located; a first processing module, configured to determine a sensible heat load of the vehicle based on the air volume of the air blower, the ambient temperature, and the outlet temperature; a second processing module, configured to determine a current total refrigerating capacity of the vehicle according to the rotating speed of the compressor, the ambient temperature, the outlet temperature, and a preset three-dimensional mapping strategy, the preset three-dimensional mapping strategy being used to represent a calibration relationship between the rotating speed of the compressor, the ambient temperature, the outlet temperature, and the total refrigerating capacity; a third processing module, configured to determine a latent heat load of the vehicle based on the current total refrigerating capacity and the sensible heat load, and determine a relative humidity of the environment where the vehicle is located based on the latent heat load, the air volume of the air blower, and the outlet temperature; and a control module, configured to control the air conditioning system of the vehicle to switch from the external circulation to the internal circulation if the relative humidity exceeds a dynamic humidity threshold.

[0062] Further function descriptions of the above-mentioned modules and units are the same as those of the corresponding embodiments, and will not be repeated here.

[0063] The vehicle air conditioning circulation control system in the embodiment is presented in the form of functional units, where the units refer to ASIC (Application Specific Integrated Circuit, special integrated circuit) circuits, processors and memories executing one or more software or fixed programs, and / or other devices that can provide the above functions.

[0064] Please refer to Figure 4 , Figure 4 is a structural schematic diagram of a computer device provided by the embodiment of the present application, as Figure 4 shown, the computer device comprises one or more processors 10, a memory 20, and interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. Various components are communicatively connected with each other by using different buses, and can be installed on a common mainboard or in other ways as needed. The processor can process instructions executed in the computer device, including instructions stored in the memory or graphics information of the memory to display a GUI on an external input / output device (such as a display device coupled to the interface). In some optional embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Also, multiple computer devices can be connected, each device providing part of the necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). Figure 4 In the figure, the processor 10 is taken as an example.

[0065] The processor 10 can be a central processor, a network processor, or a combination thereof. The processor 10 can further include hardware chips. The hardware chips can be application specific integrated circuits, programmable logic devices, or a combination thereof. The programmable logic devices can be complex programmable logic devices, field programmable logic gate arrays, general array logic, or any combination thereof.

[0066] The memory 20 stores instructions executable by the at least one processor 10 to cause the at least one processor 10 to perform the methods illustrated in the above embodiments.

[0067] The memory 20 can include a program storage area and a data storage area. The program storage area can store an operating system, application programs required by at least one function, and the like. The data storage area can store data created according to the use of the computer device, and the like. In addition, the memory 20 can include a high-speed random access memory, and can further include a non-transitory memory such as at least one disk storage device, a flash memory device, or other non-transitory solid state memory device. In some alternative embodiments, the memory 20 can optionally include a memory disposed remotely from the processor 10, which can be connected to the computer device through a network. Examples of the network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof.

[0068] The memory 20 can include a volatile memory such as a random access memory, and can further include a non-volatile memory such as a flash memory, a hard disk, or a solid state disk, and a combination thereof.

[0069] The computer device further includes a communication interface 30 for communication of the computer device with other devices or communication networks.

[0070] The embodiments of the present application further provide a computer readable storage medium. The above-described methods according to the embodiments of the present application can be implemented in hardware, firmware, or recorded in a storage medium, or be implemented as computer code to be originally stored in a remote storage medium or a non-transitory machine readable storage medium and stored in a local storage medium through network downloading, so that the methods described herein can be processed by such software on a storage medium using a general purpose computer, a special purpose processor, or programmable or special hardware. The storage medium can be a disk, an optical disk, a read-only memory, a random access memory, a flash memory, a hard disk, or a solid state disk, etc. Further, the storage medium can include a combination of the above-mentioned memories. It can be understood that the computer, the processor, the microprocessor controller, or the programmable hardware includes a storage component that can store or receive software or computer code, which, when accessed and executed by the computer, the processor, or the hardware, implements the methods illustrated in the above embodiments.

[0071] The embodiment of the present application provides a computer program product, which comprises computer instructions stored in a computer readable storage medium. A processor of a computer device reads the computer instructions from the computer readable storage medium, and the processor executes the computer instructions, so that the computer device executes the method of any embodiment of the present application.

[0072] The system and the module illustrated in the above embodiment can be specifically implemented by a computer chip or an entity, or implemented by a product with certain functions. A typical implementation device is a computer. Specifically, the computer can be, for example, a personal computer, a laptop computer, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an electronic mail device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

[0073] For the convenience of description, the above apparatus is described in functions and described respectively as various units. Of course, functions of the units can be implemented in the same or more software and / or hardware in the implementation of the present application.

[0074] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage devices, etc.) containing computer-usable program code.

[0075] The present application is described with reference to flowcharts and / or block diagrams of the methods, the systems and the computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or the block diagrams, and the combination of the flows and / or the blocks in the flowcharts and / or the block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate an apparatus for implementing the functions specified in the flowcharts and / or the block diagrams. Figure 1 The functions specified in one flow or multiple flows and / or blocks Figure 1 The apparatus for implementing the functions specified in one block or multiple blocks.

[0076] These computer program instructions can also be stored in a computer readable storage medium capable of guiding a computer or other programmable data processing devices to work in a specific manner, so that the instructions stored in the computer readable storage medium produce a product including instruction apparatus, which implements the functions specified in the flowcharts and / or the block diagrams.Figure 1 one or more processes and / or functions specified in a block Figure 1 one or more blocks or any combination thereof.

[0077] These computer program instructions can also be loaded into a computer or other programmable data processing devices, so that a series of operation steps are performed on the computer or other programmable devices to generate a computer implemented process, thus the instructions executed on the computer or other programmable devices provide a process for implementing the functions specified in the flowchart Figure 1 one or more processes and / or functions specified in a block Figure 1 one or more blocks or any combination thereof.

[0078] It should also be noted that the terms "comprising", "comprises", "including", "includes" or any other variations thereof are intended to cover a non-exclusive inclusion, such that processes, methods, articles, or apparatuses that comprise a list of elements do not include only those elements but can also include other elements not expressly listed or inherent to such processes, methods, articles, or apparatuses. Without further limitation, an element preceded by "comprises a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the recited element.

[0079] Each of the embodiments in the present specification is described in a progressive manner, and the same or similar parts between each embodiment can be referred to each other, and each embodiment focuses on the difference from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant part can be referred to the part of the method embodiment.

[0080] The above only describes the embodiments of the present application and does not limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of claims of the present application.

[0081] Although the embodiments of the present application are described in conjunction with the accompanying drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes shall fall within the scope defined by the appended claims.

Claims

1. A vehicle air conditioning cycle control method characterized by comprising: The method comprises: obtaining an outlet temperature, a blower air volume, a compressor rotating speed and an ambient temperature of an environment where the vehicle is located when an air conditioning system of the vehicle is in a defogging and external circulation mode; determining a sensible heat load of the vehicle based on the blower air volume, the ambient temperature and the outlet temperature; determining a current total refrigerating capacity of the vehicle according to the compressor rotating speed, the ambient temperature, the outlet temperature and a preset three-dimensional mapping strategy, the preset three-dimensional mapping strategy being used to represent a calibration relationship between the compressor rotating speed, the ambient temperature, the outlet temperature and the total refrigerating capacity; determining a latent heat load of the vehicle based on the current total refrigerating capacity and the sensible heat load, and determining a relative humidity of the environment where the vehicle is located based on the latent heat load, the blower air volume and the outlet temperature; if the relative humidity exceeds a dynamic humidity threshold value, switching the air conditioning system of the vehicle from the external circulation to the internal circulation.

2. The method of claim 1, wherein, The method further comprises: determining the latent heat load of the vehicle based on the current total refrigerating capacity and the sensible heat load comprises:

3. The method according to claim 1 or 2, characterized in that, calculating a difference value between the current total refrigerating capacity and the sensible heat load, and determining the difference value as the latent heat load of the vehicle. The method further comprises: determining the relative humidity of the environment where the vehicle is located based on the latent heat load, the blower air volume and the outlet temperature comprises: calculating a saturated water vapor pressure at the outlet temperature; calculating an outlet saturated humidity content based on the saturated water vapor pressure; obtaining a unit air volume condensation water content based on the latent heat load, the blower air volume and a water latent heat of vaporization; 4. The method of claim 1, wherein, determining a humidity content of the environment where the vehicle is located based on the outlet saturated humidity content and the unit air volume condensation water content; calculating the relative humidity of the environment where the vehicle is located based on the humidity content and the ambient temperature. The dynamic humidity threshold value is set in the following manner:

5. The method of claim 4, wherein, obtaining a highest dew point temperature allowed by human comfort; determining a corresponding relative humidity threshold value according to the ambient temperature and the highest dew point temperature, and determining the relative humidity threshold value as the dynamic humidity threshold value.

6. The method of claim 1, wherein, The method further comprises: the dynamic humidity threshold value linearly decreases as the ambient temperature increases, and the dynamic humidity threshold value decreases by 5% for each 1℃ increase of the ambient temperature.

7. A vehicle air conditioning cycle control system characterized by comprising: The method further comprises: if the relative humidity exceeds the dynamic humidity threshold value and the external circulation mode has lasted for a specified time, switching the air conditioning system of the vehicle from the external circulation to the internal circulation. The system comprises: an obtaining module, configured to obtain an outlet temperature, a blower air volume, a compressor rotating speed and an ambient temperature of an environment where the vehicle is located when an air conditioning system of the vehicle is in a defogging and external circulation mode; a first processing module, configured to determine a sensible heat load of the vehicle based on the blower air volume, the ambient temperature and the outlet temperature; a second processing module, configured to determine a current total refrigerating capacity of the vehicle according to the compressor rotating speed, the ambient temperature, the outlet temperature and a preset three-dimensional mapping strategy, the preset three-dimensional mapping strategy being used to represent a calibration relationship between the compressor rotating speed, the ambient temperature, the outlet temperature and the total refrigerating capacity; The third processing module is configured to determine a latent heat load of the vehicle based on the current total refrigerating capacity and the sensible heat load, and determine a relative humidity of an environment in which the vehicle is located based on the latent heat load, the air volume of the air blower, and the outlet temperature. The control module is configured to control the air conditioning system of the vehicle to switch from the external circulation to the internal circulation if the relative humidity exceeds a dynamic humidity threshold.

8. A computer device, comprising: The vehicle air conditioning circulation control method comprises the following steps: The memory and the processor are in communication connection with each other, and the memory stores computer instructions. The processor executes the computer instructions to perform the vehicle air conditioning circulation control method according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, The computer readable storage medium stores computer instructions for causing a computer to perform the vehicle air conditioning circulation control method according to any one of claims 1 to 6.

10. A computer program product, characterised in that, The computer instructions are used to cause a computer to perform the vehicle air conditioning circulation control method according to any one of claims 1 to 6.

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