A transcritical co2 heat pump air conditioning system control method and related device

Abstract

The application discloses a transcritical CO2 heat pump air conditioning system control method and related equipment. It relates to the field of vehicle air conditioning systems. The method comprises the following steps: obtaining environment state information, wherein the environment state information comprises environment temperature information and environment humidity information, the environment temperature information comprises target space temperature information and external temperature information, and the target environment temperature information comprises target environment temperature gradient information; and controlling any one or more of the compressor working frequency, the air outlet temperature and the outdoor heat exchanger evaporation temperature based on the environment state information.

Description

Technical Field

[0001] This specification relates to the field of vehicle air conditioning systems, and more specifically, this application relates to a control method and related equipment for a transcritical CO2 heat pump air conditioning system. Background Technology

[0002] The main problems with refrigerated and insulated trucks in the cold chain supply chain include the significant cooling and heating demands of the truck compartments, resulting in substantial energy consumption for energy conversion during normal operation. Furthermore, most insulated trucks currently on the market use refrigerants with strong greenhouse effects, such as R407C, which place a significant burden on global environmental protection. Insulated trucks need to maintain refrigeration, freezing, and insulation effects year-round, thus requiring heating in winter and cooling in summer. During operation, the frequent loading and unloading of goods causes significant fluctuations in the cooling and heating load inside the insulated truck, making it crucial to control and reduce these temperature fluctuations a pressing issue. Summary of the Invention

[0003] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This summary section is not intended to limit the key and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0004] In a first aspect, this application proposes a control method for a transcritical CO2 heat pump air conditioning system, the method comprising:

[0005] Obtain environmental status information, wherein the environmental status information includes environmental temperature information and environmental humidity information, the environmental temperature information includes target space temperature information and external temperature information, and the target environmental temperature information includes target environmental temperature gradient information;

[0006] Based on the above environmental condition information, one or more of the following can be controlled: compressor operating frequency, air outlet temperature, and outdoor heat exchanger evaporation temperature.

[0007] In some embodiments, the aforementioned target space temperature information further includes target space average temperature information and target space temperature fluctuation amplitude information, and the aforementioned temperature information also includes external temperature information.

[0008] Also includes:

[0009] The operating frequency of the compressor is controlled based on the above-mentioned target ambient temperature gradient information, the above-mentioned target space average temperature information, the above-mentioned target space temperature fluctuation amplitude information, the above-mentioned external temperature information, the first empirical coefficient, and the second empirical coefficient.

[0010] In some implementations...

[0011] The above-mentioned control of the compressor operating frequency based on the target ambient temperature gradient information, the target space average temperature information, the target space temperature fluctuation amplitude information, the external temperature information, the first empirical coefficient, and the second empirical coefficient includes:

[0012] The operating power of the compressor is controlled by the following formula:

[0013]

[0014] In the formula, f is the operating frequency of the compressor mentioned above. The above-mentioned target environment temperature gradient information, k is the above-mentioned first empirical coefficient, t air For the aforementioned external temperature information, t car，ave For the above target space average temperature information, t car，max The above-mentioned target space fluctuation temperature amplitude information, A is the above-mentioned second empirical coefficient.

[0015] In some embodiments, the aforementioned environmental humidity information also includes target space humidity information, and the aforementioned target space temperature information also includes the current temperature information of the target space.

[0016] The above methods also include:

[0017] Based on the aforementioned external temperature information, the aforementioned target space humidity information, the preset target humidity information, the current temperature information of the target space, and the third empirical coefficient, the aforementioned air outlet temperature information is determined.

[0018] In some embodiments, determining the outlet temperature information based on the external temperature information, the target space humidity information, the preset target humidity information, the current temperature information of the target space, and the third empirical coefficient includes:

[0019] The above air outlet temperature information is determined using the following formula:

[0020]

[0021] In the formula, t out For the above air outlet temperature information, t air The above refers to external temperature information; d now For the current temperature information of the target space mentioned above, d pre The above-mentioned preset target humidity information; t car Here, B represents the current temperature information of the target space, and B represents the third empirical coefficient mentioned above.

[0022] In some embodiments, the aforementioned ambient temperature information further includes ambient dew point temperature information, external evaporation temperature information at the state point, average external evaporation temperature information at the state point, and external evaporation amplitude temperature information at the state point.

[0023] The above methods also include:

[0024] Based on the external evaporation temperature information of the above-mentioned state point, the average external evaporation temperature information of the above-mentioned state point, and the external evaporation amplitude temperature information of the state point, a reference temperature is determined.

[0025] The outdoor heat exchanger evaporation temperature is controlled based on the above-mentioned ambient dew point temperature information so that the difference between the outdoor heat exchanger evaporation temperature and the above-mentioned ambient dew point temperature information is less than or equal to the above-mentioned reference temperature.

[0026] In some implementations...

[0027] The above reference temperature is determined by the following formula:

[0028]

[0029] In the formula, t c t is the reference temperature. evap，i External evaporation temperature information at the state point, t ave For the external average evaporation temperature information at the state point, t evap，max This refers to the external evaporation amplitude and temperature information at the state point.

[0030] In some implementations, it also includes:

[0031] Determine the working mode based on environmental status information;

[0032] When the above-mentioned working mode is heating mode, the above-mentioned outdoor heat exchanger evaporation temperature, the above-mentioned compressor operating frequency and the above-mentioned air outlet temperature are controlled sequentially based on the above-mentioned environmental status information.

[0033] In some implementations, it also includes:

[0034] When the above-mentioned working mode is cooling mode, the operating frequency of the above-mentioned compressor and the temperature of the above-mentioned air outlet are controlled sequentially based on the above-mentioned environmental status information.

[0035] Secondly, this application also proposes a control device for a transcritical CO2 heat pump air conditioning system, comprising:

[0036] The acquisition unit is used to acquire environmental state information, wherein the environmental state information includes environmental temperature information and environmental humidity information, the environmental temperature information includes target space temperature information and external temperature information, and the target environmental temperature information includes target environmental temperature gradient information.

[0037] The control unit is used to control one or more of the compressor operating frequency, air outlet temperature, and outdoor heat exchanger evaporation temperature based on the above environmental status information.

[0038] Thirdly, an electronic device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program stored in the memory to implement the steps of the transcritical CO2 heat pump air conditioning system control method as described in any of the first aspects above.

[0039] Fourthly, this application also proposes a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the transcritical CO2 heat pump air conditioning system control method of any of the above claims in the first aspect.

[0040] Fifthly, this application also proposes a vehicle including a transcritical CO2 heat pump air conditioning system, the transcritical CO2 heat pump air conditioning system including the control device as described in the second aspect.

[0041] In summary, the transcritical CO2 heat pump air conditioning system control method of this application embodiment includes: acquiring environmental state information, wherein the environmental state information includes environmental temperature information and environmental humidity information, the environmental temperature information includes target space temperature information and external temperature information, and the target environmental temperature information includes target environmental temperature gradient information; and controlling any one or more of the compressor operating frequency, air outlet temperature, and outdoor heat exchanger evaporation temperature based on the environmental state information. The transcritical CO2 heat pump air conditioning system control method proposed in this application embodiment acquires environmental state information including environmental temperature information and environmental humidity information, and controls any one or more of the compressor operating frequency, air outlet temperature, and outdoor heat exchanger evaporation temperature based on the environmental state information. In related technologies, refrigerated and refrigerated insulated vehicles cannot cope with changes in cooling and heating loads. This application proposes controlling the compressor frequency based on monitoring the temperature change gradient inside the vehicle compartment to regulate cooling and heating capacity, and suppressing rapid temperature changes through a feedforward approach. Meanwhile, given the high humidity control requirements of refrigerated and insulated trucks, and considering the current lack of precise humidity control measures in related technologies, this application proposes a method that integrates the environmental conditions inside and outside the target space with the required target humidity. Based on the humidity demand, the outlet air temperature is adjusted in real time, and dehumidification is performed by combining the relationship between outlet air temperature and dehumidification, achieving precise control. Furthermore, addressing the problem that current refrigerated and insulated trucks struggle to handle large temperature fluctuations caused by frost in winter, thus hindering precise temperature adjustment inside the truck, this application proposes a frost-free control strategy. By precisely controlling the outdoor evaporation temperature, the evaporation temperature inside the outdoor heat exchanger is maintained above or equal to the outdoor ambient dew point temperature to prevent water separation and frost formation, thereby fundamentally solving the problem of difficult frost control in winter.

[0042] The transcritical CO2 heat pump air conditioning system control method proposed in this application, other advantages, objectives and features of this application will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this application. Attached Figure Description

[0043] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit this specification. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0044] Figure 1 A schematic flowchart of a control method for a transcritical CO2 heat pump air conditioning system provided in this application embodiment;

[0045] Figure 2A schematic diagram of a transcritical CO2 heat pump air conditioning system provided in this application embodiment;

[0046] Figure 3 A schematic flowchart of another transcritical CO2 heat pump air conditioning system control method provided in this application embodiment;

[0047] Figure 4 A structural schematic diagram of a transcritical CO2 heat pump air conditioning system control device provided in this application embodiment;

[0048] Figure 5 A schematic diagram of the structure of a control electronic device for a transcritical CO2 heat pump air conditioning system provided in this application embodiment.

[0049] Figure 6 This is a structural schematic diagram of a vehicle provided in an embodiment of this application. Detailed Implementation

[0050] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus. The technical solutions of the embodiments of this application will now be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them.

[0051] The main problems with refrigerated and insulated trucks in the cold chain supply chain include: the large demand for cooling and heating in the truck compartments, which consumes a lot of electricity for energy conversion during normal operation; at the same time, most insulated truck products on the market currently use refrigerants such as R407C, which have a strong greenhouse effect, thus placing a significant burden on global environmental protection.

[0052] For refrigerated trucks, good refrigeration, freezing, and insulation effects are required, with the interior needing heating in winter and cooling in summer. Based on this, this application proposes using CO2 as the working fluid and its transcritical cycle to construct a heat pump air conditioning system for refrigerated and insulated trucks, fully utilizing its powerful heating performance and excellent environmental properties. Furthermore, considering CO2's low cost, high economic efficiency, and safe use, it holds great promise as a major alternative refrigerant for refrigerated and insulated trucks, possessing broad development potential and worthy of in-depth research and promotion.

[0053] In addition, refrigerated and frozen insulated vehicles have their own unique operating characteristics. The transcritical CO2 heat pump air conditioning system installed on the vehicle needs to be adapted to specific control logic. The operating control logic should be improved according to the specific operating characteristics and needs of the application scenario, and the control logic related to other fields (heat pump water heaters, heat pump heating, vehicle air conditioning heat pumps and thermal management, etc.) cannot be copied.

[0054] During the operation of refrigerated and frozen insulated trucks, the frequent loading and unloading of goods causes significant fluctuations in the cooling and heating load inside the truck, requiring a larger margin for the heat pump air conditioning system. The system cannot be designed based solely on average cooling or heating capacity demands. Simultaneously, the goods stored in the truck often have strict humidity requirements, necessitating precise control of the air supply temperature to ensure adequate humidity levels. During winter operation of the heat pump, defrosting of the outdoor heat exchanger should be avoided as much as possible. Once the system enters defrosting mode, significant temperature fluctuations will occur inside the truck. A frost-free control strategy can effectively address this issue.

[0055] Please see Figure 1 This is a schematic flowchart of a transcritical CO2 heat pump air conditioning system control method provided in an embodiment of this application, which may specifically include:

[0056] S110. Obtain environmental status information, wherein the environmental status information includes environmental temperature information and environmental humidity information, the environmental temperature information includes target space temperature information and external temperature information, and the target environmental temperature information includes target environmental temperature gradient information.

[0057] For example, this application uses a transcritical CO2 heat pump air conditioning system installed on a rail-mounted refrigerated and insulated vehicle. A schematic diagram of the working principle of the transcritical CO2 heat pump air conditioning system is shown below. Figure 2 As shown, the CO2 refrigerant fluid is passed in series through the compressor, evaporator, throttling device and condenser, and finally returns to the compressor to complete one transcritical CO2 heat pump cycle and then circulates again. By monitoring the environment and regulating the system based on the characteristics of the CO2 working fluid, heating and cooling are performed according to the environmental conditions to achieve the preset requirements.

[0058] Environmental status information includes ambient temperature and humidity. Ambient temperature information includes the target space temperature and the external temperature. For rail-mounted refrigerated and insulated vehicles, the target space is the internal space of the refrigerated / insulated compartment, and the external space is the space outside the refrigerated / insulated compartment. The target ambient temperature gradient information refers to the rate of temperature change. For example, when the vehicle's doors are opened during loading and unloading, heat exchange occurs between the target space inside the compartment and the external environment, causing a significant change in the target ambient temperature gradient information.

[0059] It should be noted that the control method proposed in this application can be applied to any other working scenario with a transcritical CO2 heat pump air conditioning system, and is not limited to rail refrigerated and insulated vehicles.

[0060] S120. Based on the above environmental status information, control one or more of the following: compressor operating frequency, air outlet temperature, and outdoor heat exchanger evaporation temperature.

[0061] For example, environmental status information includes ambient temperature and humidity information, and the environment includes both the environment inside and outside the target space. Based on the environmental status information, one or more of the following can be controlled: compressor operating frequency, outlet air temperature, and outdoor heat exchanger evaporation temperature, thereby regulating the temperature and humidity of the target space. For instance, the compressor operating frequency can be controlled based on the target ambient temperature gradient; the external temperature and humidity, as well as the temperature and humidity of the target space and the required humidity conditions of the target space, can be monitored in real time to automatically control the outlet air temperature to ensure that the humidity of the target space meets the requirements; the evaporation temperature can also be monitored and controlled to prevent water separation and frost formation.

[0062] In summary, the transcritical CO2 heat pump air conditioning system control method proposed in this application acquires environmental state information, including ambient temperature and humidity information, and controls one or more of the compressor operating frequency, outlet air temperature, and outdoor heat exchanger evaporation temperature based on the environmental state information. In related technologies, refrigerated and insulated vehicles cannot cope with varying cooling and heating loads. This application proposes controlling the compressor frequency based on monitoring the temperature gradient within the vehicle compartment to regulate cooling and heating capacity, suppressing rapid temperature changes through a feedforward approach. Furthermore, addressing the high humidity control requirements of refrigerated and insulated vehicles and the current lack of precise humidity control measures in related technologies, this application proposes a method that integrates the environmental conditions inside and outside the target space with the required target humidity. Based on the humidity demand, the outlet air temperature is adjusted in real time, and dehumidification is performed by combining the relationship between outlet air temperature and dehumidification, achieving precise control. Furthermore, in response to the current problem that refrigerated and frozen insulated trucks cannot handle the large temperature fluctuations caused by frost in winter, thus making it impossible to accurately adjust the temperature inside the truck, this application proposes a frost-free control strategy. By precisely controlling the outdoor evaporation temperature, the evaporation temperature inside the outdoor heat exchanger is kept greater than or equal to the outdoor ambient dew point temperature to achieve no water separation and no frost formation, thereby fundamentally solving the problem of difficult frost control in winter.

[0063] In some embodiments, the aforementioned target space temperature information further includes target space average temperature information and target space temperature fluctuation amplitude information, and the aforementioned temperature information also includes external temperature information.

[0064] Also includes:

[0065] The operating frequency of the compressor is controlled based on the above-mentioned target ambient temperature gradient information, the above-mentioned target space average temperature information, the above-mentioned target space temperature fluctuation amplitude information, the above-mentioned external temperature information, the first empirical coefficient, and the second empirical coefficient.

[0066] For example, the average temperature information of the target space is the average value of the target space temperature information within a preset monitoring period, the temperature fluctuation amplitude information of the target space is the maximum value of the target space temperature information within a preset monitoring period, and the external temperature information is the temperature information outside the target space. The first empirical coefficient and the second empirical coefficient can be obtained through calibration experiments.

[0067] In some implementations...

[0068] The above-mentioned control of the compressor operating frequency based on the target ambient temperature gradient information, the target space average temperature information, the target space temperature fluctuation amplitude information, the external temperature information, the first empirical coefficient, and the second empirical coefficient includes:

[0069] The operating power of the compressor is controlled by the following formula:

[0070]

[0071] In the formula, f is the operating frequency of the compressor mentioned above. The above-mentioned target environment temperature gradient information, k is the above-mentioned first empirical coefficient, t air For the aforementioned external temperature information, t car，ave For the above target space average temperature information, t car，max The above-mentioned target space fluctuation temperature amplitude information, A is the above-mentioned second empirical coefficient.

[0072] For example, the operating frequency of the system compressor is controlled by monitoring the target ambient temperature gradient information (i.e., the temperature gradient inside the compartment). For instance, in cooling mode, when the system temperature rises rapidly, even if the real-time temperature value inside the compartment is not high, a significant change in the system temperature gradient can be detected, which can drive the compressor to increase its frequency in advance, thereby increasing the system's cooling capacity to cope with the gradient change. In other words, the rapid temperature rise is suppressed by the feedforward method. Conversely, similar regulation can be implemented when the temperature drops, and the same applies in heating mode. The relationship between the temperature gradient and the compressor frequency is controlled according to formula (1), which suppresses the driving force of temperature change before a large temperature change occurs and keeps it balanced at the preset temperature, thus ensuring that the compartment of the refrigerated and frozen insulated vehicle is always in a constant temperature state, which is more conducive to the preservation of goods.

[0073] In some embodiments, the aforementioned environmental humidity information also includes target space humidity information, and the aforementioned target space temperature information also includes the current temperature information of the target space.

[0074] The above methods also include:

[0075] Based on the aforementioned external temperature information, the aforementioned target space humidity information, the preset target humidity information, the current temperature information of the target space, and the third empirical coefficient, the aforementioned air outlet temperature information is determined.

[0076] For example, the humidity information of the target space can be obtained by a humidity sensor installed in the target space, with the target humidity information preset as the ideal storage humidity, and the third empirical coefficient can also be obtained through calibration tests.

[0077] In some embodiments, determining the outlet temperature information based on the external temperature information, the target space humidity information, the preset target humidity information, the current temperature information of the target space, and the third empirical coefficient includes:

[0078] The above air outlet temperature information is determined using the following formula:

[0079]

[0080] In the formula, t out For the above air outlet temperature information, t air The above refers to external temperature information; d now For the current temperature information of the target space mentioned above, d pre The above-mentioned preset target humidity information; t car Here, B represents the current temperature information of the target space, and B represents the third empirical coefficient mentioned above.

[0081] For example, the method provided in this application embodiment can comprehensively regulate the environmental conditions inside and outside the target space and the required target humidity, automatically controlling the outlet air temperature to ensure that the target space humidity meets the requirements. That is, the humidity level of the target space is controlled by adjusting the outlet air temperature. The lower the outlet air temperature, the more severe the moisture precipitation on the evaporator. When the system detects that the humidity of the target space is higher than the preset level, it adjusts the outlet air temperature to lower the temperature for dehumidification; conversely, when dehumidification is not required, it raises the outlet air temperature.

[0082] The temperature of the air outlet is adjusted by formula (2). When the humidity is too high, the system detects the high humidity signal and automatically adjusts the temperature of the air outlet to reduce the temperature of the air outlet. As a result, more water is extracted from the evaporator to achieve the dehumidification effect of the target space and realize the high-precision adjustment requirement of the humidity of the target space.

[0083] In some embodiments, the aforementioned ambient temperature information further includes ambient dew point temperature information, external evaporation temperature information at the state point, average external evaporation temperature information at the state point, and external evaporation amplitude temperature information at the state point.

[0084] The above methods also include:

[0085] Based on the external evaporation temperature information of the above-mentioned state point, the average external evaporation temperature information of the above-mentioned state point, and the external evaporation amplitude temperature information of the state point, a reference temperature is determined.

[0086] The outdoor heat exchanger evaporation temperature is controlled based on the above-mentioned ambient dew point temperature information so that the difference between the outdoor heat exchanger evaporation temperature and the above-mentioned ambient dew point temperature information is less than or equal to the above-mentioned reference temperature.

[0087] For example, a status point is a specific data acquisition point, and the ambient dew point temperature information refers to the temperature of saturated water vapor in the air under a specific atmospheric pressure. The external evaporation temperature information of the status point is the external evaporation temperature corresponding to the current data acquisition point, the external evaporation amplitude temperature information of the status point is the maximum value of the external evaporation temperature within the monitoring period, and the external evaporation average temperature information is the average value of the external evaporation temperature within the monitoring period. This ensures that the evaporation temperature inside the outdoor heat exchanger is equal to or less than the dew point temperature of the outdoor ambient air, thereby preventing water separation and frost formation.

[0088] In some implementations...

[0089] The above reference temperature is determined by the following formula:

[0090]

[0091] In the formula, t c t is the reference temperature. evap，i External evaporation temperature information at the state point, t ave For the external average evaporation temperature information at the state point, t evap，max This refers to the external evaporation amplitude and temperature information at the state point.

[0092] For example, according to the reference temperature defined in formula (3), when the temperature difference between the target space and the outside temperature is greater than the reference temperature, the outdoor evaporation temperature is adjusted, and this difference is monitored in real time until it falls within the reference temperature range. This ensures that when the heat pump is running in winter for heating, the system continuously monitors the outdoor evaporation temperature and adjusts it precisely in real time to match the outdoor air dew point temperature, preventing water precipitation on the evaporator and thus eliminating frost formation and preventing fluctuations in the cabin temperature.

[0093] The correspondence between the symbols and subscripts of the parameters in formulas (1) to (3) and the meanings of the parameters are shown in Table 1:

[0094]

[0095] Table 1 shows the correspondence between symbols and subscripts, parameter abbreviations, and parameter meanings.

[0096] In some implementations, it also includes:

[0097] Determine the working mode based on environmental status information;

[0098] When the above-mentioned working mode is heating mode, the above-mentioned outdoor heat exchanger evaporation temperature, the above-mentioned compressor operating frequency and the above-mentioned air outlet temperature are controlled sequentially based on the above-mentioned environmental status information.

[0099] For example, such as Figure 3The diagram shown illustrates another control flow of a transcritical CO2 heat pump air conditioning system proposed in this application. After the air conditioning system is powered on, it first performs initialization settings. Based on sensor monitoring of environmental status information, including the temperature and humidity inside and outside the target space, it determines whether to use cooling or heating mode. If heating mode is selected, the outdoor heat exchanger evaporation temperature is first adjusted to achieve frost-free control using the method described in the previous embodiment, thus stabilizing the evaporation temperature. Then, based on the target ambient temperature gradient, the target space average temperature, the target space temperature fluctuation amplitude, the external temperature, a first empirical coefficient, and a second empirical coefficient, the compressor's operating frequency is controlled to stabilize the temperature within the target space. Next, based on the external temperature, target space humidity, a preset target humidity, the current target space temperature, and a third empirical coefficient, the outlet temperature is adjusted to control the humidity to meet the preset requirements.

[0100] In some implementations, it also includes:

[0101] When the above-mentioned working mode is cooling mode, the operating frequency of the above-mentioned compressor and the temperature of the above-mentioned air outlet are controlled sequentially based on the above-mentioned environmental status information.

[0102] For example, after the air conditioning system is turned on, it first performs initial settings. Based on sensor monitoring of environmental status information, including the temperature and humidity inside and outside the target space, it determines whether to use cooling or heating mode. If it is in cooling / heating mode, there is no need to control the evaporator temperature. The compressor's operating frequency is directly controlled based on the target ambient temperature gradient, the target space's average temperature, the target space's fluctuating temperature amplitude, the external temperature, a first empirical coefficient, and a second empirical coefficient to stabilize the temperature inside the target space. Then, based on the external temperature, the target space's humidity, the preset target humidity, the target space's current temperature, and a third empirical coefficient, the outlet temperature is adjusted to control the humidity to meet the preset requirements.

[0103] Please see Figure 4 One embodiment of the transcritical CO2 heat pump air conditioning system control device in this application may include:

[0104] The acquisition unit 21 is used to acquire environmental state information, wherein the environmental state information includes environmental temperature information and environmental humidity information, the environmental temperature information includes target space temperature information and external temperature information, and the target environmental temperature information includes target environmental temperature gradient information.

[0105] The control unit 22 is used to control one or more of the compressor operating frequency, air outlet temperature and outdoor heat exchanger evaporation temperature based on the above environmental state information.

[0106] The control unit for a transcritical CO2 heat pump air conditioning system can also operate in the following manner:

[0107] In some embodiments, the aforementioned target space temperature information further includes target space average temperature information and target space temperature fluctuation amplitude information, and the aforementioned temperature information also includes external temperature information.

[0108] Also includes:

[0109] The operating frequency of the compressor is controlled based on the above-mentioned target ambient temperature gradient information, the above-mentioned target space average temperature information, the above-mentioned target space temperature fluctuation amplitude information, the above-mentioned external temperature information, the first empirical coefficient, and the second empirical coefficient.

[0110] In some implementations...

[0111] The above-mentioned control of the compressor operating frequency based on the target ambient temperature gradient information, the target space average temperature information, the target space temperature fluctuation amplitude information, the external temperature information, the first empirical coefficient, and the second empirical coefficient includes:

[0112] The operating power of the compressor is controlled by the following formula:

[0113]

[0114] In the formula, f is the operating frequency of the compressor mentioned above. Here, k represents the target environment temperature gradient information, t_air represents the external temperature information, t_(car, ave) represents the target space average temperature information, t_(car, max) represents the target space temperature fluctuation amplitude information, and A represents the second empirical coefficient.

[0115] In some embodiments, the aforementioned environmental humidity information also includes target space humidity information, and the aforementioned target space temperature information also includes the current temperature information of the target space.

[0116] The above methods also include:

[0117] Based on the aforementioned external temperature information, the aforementioned target space humidity information, the preset target humidity information, the current temperature information of the target space, and the third empirical coefficient, the aforementioned air outlet temperature information is determined.

[0118] In some embodiments, determining the outlet temperature information based on the external temperature information, the target space humidity information, the preset target humidity information, the current temperature information of the target space, and the third empirical coefficient includes:

[0119] The above air outlet temperature information is determined using the following formula:

[0120]

[0121] In the formula, t_out is the above-mentioned outlet air temperature information, t_air is the above-mentioned external temperature information; d_now is the above-mentioned target space current temperature information, d_pre is the above-mentioned preset target humidity information; t_car is the above-mentioned target space current temperature information, and B is the above-mentioned third empirical coefficient.

[0122] In some embodiments, the aforementioned ambient temperature information further includes ambient dew point temperature information, external evaporation temperature information at the state point, average external evaporation temperature information at the state point, and external evaporation amplitude temperature information at the state point.

[0123] The above methods also include:

[0124] Based on the external evaporation temperature information of the above-mentioned state point, the average external evaporation temperature information of the above-mentioned state point, and the external evaporation amplitude temperature information of the state point, a reference temperature is determined.

[0125] The evaporation temperature of the outdoor heat exchanger is controlled based on the aforementioned ambient dew point temperature information, so that the difference between the outdoor heat exchanger evaporation temperature and the aforementioned ambient dew point temperature information is less than or equal to the aforementioned reference temperature.

[0126] In some implementations...

[0127] The above reference temperature is determined by the following formula:

[0128]

[0129] In the formula, t c t is the reference temperature. evap，i External evaporation temperature information at the state point, t ave For the external average evaporation temperature information at the state point, t evap，max This refers to the external evaporation amplitude and temperature information at the state point.

[0130] In some implementations, it also includes:

[0131] Determine the working mode based on environmental status information;

[0132] When the above-mentioned working mode is heating mode, the above-mentioned outdoor heat exchanger evaporation temperature, the above-mentioned compressor operating frequency and the above-mentioned air outlet temperature are controlled sequentially based on the above-mentioned environmental status information.

[0133] In some implementations, it also includes:

[0134] When the above-mentioned working mode is cooling mode, the operating frequency of the above-mentioned compressor and the temperature of the above-mentioned air outlet are controlled sequentially based on the above-mentioned environmental status information.

[0135] like Figure 5 As shown, this application embodiment also provides an electronic device 300, including a memory 310, a processor 320, and a computer program 311 stored in the memory 310 and executable on the processor. When the processor 320 executes the computer program 311, it implements the steps of any of the above-described methods for controlling a transcritical CO2 heat pump air conditioning system.

[0136] In practical implementation, when the computer program 311 is executed by the processor, it can achieve the following: Figure 1 Any of the corresponding implementation methods in the embodiments.

[0137] like Figure 6 As shown, this application embodiment also proposes a vehicle 10, including a transcritical CO2 heat pump air conditioning system 101, the transcritical CO2 heat pump air conditioning system 101 including the transcritical CO2 heat pump air conditioning system control device 1011 described in the third aspect, the transcritical CO2 heat pump air conditioning system control device 1011 being capable of implementing the steps of the method described in any of the first aspects.

[0138] It should be noted that the descriptions of each embodiment in the above embodiments have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0139] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0140] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create a machine for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0141] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0142] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0143] This application also provides a computer program product, which includes computer software instructions. When the computer software instructions are executed on a processing device, the processing device performs the control process of the transcritical CO2 heat pump air conditioning system in the corresponding embodiment.

[0144] A computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the flow or function according to the embodiments of this application is generated. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium may be any available medium that a computer can store or a data storage device such as a server or data center that integrates one or more available media. The available medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid-state disk (SSD)).

[0145] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0146] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, or indirect coupling or communication connection between apparatuses or units, and may be electrical, mechanical, or other forms.

[0147] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0148] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0149] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0150] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A control method for a transcritical CO2 heat pump air conditioning system, characterized in that, include: Acquire environmental status information, wherein the environmental status information includes environmental temperature information and environmental humidity information, the environmental temperature information includes target space temperature information and external temperature information, and the target space temperature information includes target environmental temperature gradient information; Based on the environmental condition information, control one or more of the following: compressor operating frequency, air outlet temperature, and outdoor heat exchanger evaporation temperature; The target space temperature information also includes the target space average temperature information and the target space temperature fluctuation amplitude information. Also includes: The compressor's operating frequency is controlled based on the target ambient temperature gradient information, the target space average temperature information, the target space temperature fluctuation amplitude information, the external temperature information, a first empirical coefficient, and a second empirical coefficient. The method of controlling the compressor operating frequency based on the target ambient temperature gradient information, the target space average temperature information, the target space temperature fluctuation amplitude information, the external temperature information, a first empirical coefficient, and a second empirical coefficient includes: The operating frequency of the compressor is controlled by the following formula: In the formula, f is the operating frequency of the compressor. t represents the target environment temperature gradient information, k represents the first empirical coefficient, and t air For the external temperature information, t car，ave The target space average temperature information, t car，max The target space temperature fluctuation amplitude information, where A is the second empirical coefficient; The environmental humidity information also includes the target space humidity information, and the target space temperature information also includes the current temperature information of the target space. The method further includes: The air outlet temperature information is determined based on the external temperature information, the target space humidity information, the preset target humidity information, the target space current temperature information, and the third empirical coefficient. The process of determining the air outlet temperature information based on the external temperature information, the target space humidity information, the preset target humidity information, the current temperature information of the target space, and the third empirical coefficient includes: The outlet temperature information is determined according to the following formula: In the formula, t out For the air outlet temperature information, t air The external temperature information; d now For the target space humidity information, d pre The preset target humidity information; t car B represents the current temperature information of the target space, and B represents the third empirical coefficient.

2. The control method for a transcritical CO2 heat pump air conditioning system according to claim 1, characterized in that, The ambient temperature information also includes ambient dew point temperature information, external evaporation temperature information at the state point, average external evaporation temperature information at the state point, and external evaporation amplitude temperature information at the state point. The method further includes: Based on the external evaporation temperature information of the state point, the average external evaporation temperature information of the state point, and the external evaporation amplitude temperature information of the state point, a reference temperature is determined. The outdoor heat exchanger evaporation temperature is controlled based on the ambient dew point temperature information, so that the difference between the outdoor heat exchanger evaporation temperature and the ambient dew point temperature information is less than or equal to the reference temperature.

3. The control method for a transcritical CO2 heat pump air conditioning system according to claim 2, characterized in that, The reference temperature is determined by the following formula: In the formula, The reference temperature is... External evaporation temperature information at the state point This refers to the average external evaporation temperature information at the state point. This refers to the external evaporation amplitude and temperature information at the state point.

4. The control method for a transcritical CO2 heat pump air conditioning system according to claim 1, characterized in that, Also includes: Determine the working mode based on environmental status information; When the operating mode is heating mode, the outdoor heat exchanger evaporation temperature, the compressor operating frequency, and the air outlet temperature are controlled sequentially based on the environmental status information.

5. The control method for a transcritical CO2 heat pump air conditioning system according to claim 4, characterized in that, Also includes: When the operating mode is cooling mode, the compressor operating frequency and the air outlet temperature are controlled sequentially based on the environmental state information.

6. A control device for a transcritical CO2 heat pump air conditioning system, used to implement the control method for a transcritical CO2 heat pump air conditioning system as described in any one of claims 1-5, characterized in that, include: An acquisition unit is used to acquire environmental state information, wherein the environmental state information includes environmental temperature information and environmental humidity information, the environmental temperature information includes target space temperature information and external temperature information, and the target space temperature information includes target environmental temperature gradient information; The control unit is used to control one or more of the compressor operating frequency, air outlet temperature, and outdoor heat exchanger evaporation temperature based on the environmental state information.

7. An electronic device, comprising: The memory and processor are characterized in that the processor is used to execute a computer program stored in the memory to implement the steps of the transcritical CO2 heat pump air conditioning system control method as described in any one of claims 1-5.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by the processor, it implements the steps of the transcritical CO2 heat pump air conditioning system control method as described in any one of claims 1-5.

9. A vehicle comprising a transcritical CO2 heat pump air conditioning system, the transcritical CO2 heat pump air conditioning system comprising the control device as claimed in claim 6.

Images