Control method, system and equipment of vehicle heat pump system and medium

Abstract

The invention provides a control method, system and equipment for a vehicle heat pump system and a medium, and the control method comprises the steps that the operation condition of the vehicle heat pump system, the water temperature of a motor outlet in a motor loop and the water temperature of a cooler inlet in a battery loop are obtained, and the air inlet parameter and the air outlet parameter of an evaporator in a passenger compartment loop and the air volume passing through the evaporator are obtained; battery parameters and water pump flow in a battery loop are obtained; according to the air inlet parameters, the air outlet parameters and the air volume, passenger compartment required energy is calculated; calculating battery demand energy according to battery parameters and water pump flow; calculating system demand energy according to the passenger compartment demand energy and the battery demand energy; according to the operation working condition, the system demand energy, the water temperature of a motor outlet or the water temperature of a cooler inlet, the rotating speed of a compressor is obtained; and the opening degree of a refrigerant valve is obtained according to the operation working condition, the system demand energy and the water temperature of a motor outlet. Effective optimization of energy driving of the heat pump system can be achieved, and excessive refrigeration or excessive heating is avoided.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and in particular to a control method, system, device and medium for a vehicle heat pump system. Background Technology

[0002] New energy vehicle heat pump systems need to simultaneously meet the needs of multiple thermal management objects, including passenger compartment cooling, passenger compartment heating, and power battery cooling and heating modes. During actual vehicle operation, multiple modules may simultaneously generate cooling or heating energy demands. For example, during fast charging in summer, both the passenger compartment and the battery require cooling; during low-temperature startup in winter, both the passenger compartment and the battery require heating. In existing technologies, the control strategy of heat pump systems calculates the energy of each module separately and then independently controls the compressor speed and refrigerant valve opening. This results in a lack of coordinated control between modules, uneven refrigerant distribution, and issues affecting system stability. Therefore, improvements are needed. Summary of the Invention

[0003] This invention provides a control method, system, device, and medium for a vehicle heat pump system, in order to solve the technical problem of lack of coordinated control between various modules in the existing heat pump system.

[0004] This invention proposes a control method for a vehicle heat pump system, comprising:

[0005] The system obtains the operating conditions of the vehicle's heat pump system, the water temperature at the motor outlet in the motor circuit, the water temperature at the cooler in the battery circuit, the air inlet parameters, air outlet parameters, and air volume passing through the evaporator in the passenger compartment circuit, and the battery parameters and water pump flow rate in the battery circuit.

[0006] Calculate the energy requirement of the passenger compartment based on the air intake parameters, air outlet parameters, and air volume;

[0007] Calculate the battery energy requirement based on battery parameters and water pump flow rate;

[0008] The system's energy requirements are calculated based on the energy requirements of the crew cabin and the battery.

[0009] The compressor speed is obtained based on the operating conditions, the system energy demand, and the motor outlet water temperature or cooler inlet water temperature.

[0010] The refrigerant valve opening is obtained based on the operating conditions, the system's energy requirements, and the motor outlet water temperature.

[0011] The compressor operation is controlled according to the compressor speed, and the refrigerant valve is adjusted according to the refrigerant valve opening.

[0012] In one embodiment of the present invention, the step of calculating the energy requirement of the passenger compartment based on the air intake parameters, air outlet parameters, and air volume includes:

[0013] The corresponding inlet enthalpy value is obtained based on the inlet air temperature and inlet air humidity in the inlet air parameters, and the corresponding outlet enthalpy value is obtained based on the outlet air temperature and outlet air humidity in the outlet air parameters.

[0014] Calculate the enthalpy difference between the intake and exhaust air values, and then multiply the enthalpy difference by the air volume to obtain the energy requirement of the occupant cabin.

[0015] In one embodiment of the present invention, the step of calculating the battery energy demand based on battery parameters and water pump flow rate includes:

[0016] Calculate the temperature difference between the battery inlet water temperature and the battery average water temperature in the battery parameters.

[0017] The corresponding heat transfer coefficient is obtained from the water pump flow rate in the battery parameters;

[0018] The energy required by the battery is obtained by multiplying the water temperature difference and the heat transfer coefficient.

[0019] In one embodiment of the present invention, the step of obtaining the compressor speed based on the operating conditions, the system energy demand, and the motor outlet water temperature or the cooler inlet water temperature includes:

[0020] Determine the operating condition:

[0021] When the operating condition is that the crew cabin circuit is cooled separately and / or the battery circuit is cooled separately, the compressor speed is obtained according to the system's energy requirement and the motor outlet water temperature;

[0022] When the operating conditions are that the crew compartment circuit is heated alone and / or the battery circuit is heated alone, or the crew compartment circuit and the battery circuit are heated simultaneously, the compressor speed is obtained based on the system's energy demand and the cooler inlet water temperature.

[0023] In one embodiment of the present invention, the step of obtaining the compressor speed based on the system energy demand and the cooler inlet water temperature when the operating condition is that the crew compartment circuit is heated alone and / or the battery circuit is heated alone includes:

[0024] When the operating condition is that the crew compartment circuit is heated alone and / or the battery circuit is heated alone, the initial speed is obtained according to the system's energy demand and the cooler inlet water temperature in the preset compressor speed mapping relationship;

[0025] Obtain the target outlet temperature and the actual outlet temperature of the cryogenic loop condenser in the crew compartment loop; calculate the difference between the target outlet temperature and the actual outlet temperature to obtain the outlet temperature difference.

[0026] The corresponding proportional parameters are obtained based on the outlet temperature difference and the system energy demand.

[0027] The corresponding integral parameters are obtained based on the outlet temperature difference and the system energy demand.

[0028] The corrected rotational speed is obtained based on the proportional parameter, integral parameter, and outlet temperature difference.

[0029] The compressor speed is obtained by summing the initial speed and the corrected speed.

[0030] In one embodiment of the present invention, the corrected compressor speed V1 satisfies:

[0031]

[0032] Where V0 represents the initial rotational speed, K p Let K be a proportional parameter, where e(k) represents the current outlet temperature difference. i Let e(n) be the integral parameter, representing the outlet temperature difference at historical moments. This indicates the corrected rotational speed.

[0033] In one embodiment of the present invention, the step of obtaining the refrigerant valve opening degree based on the operating conditions, the system energy demand, and the motor outlet water temperature includes:

[0034] Determine the operating condition:

[0035] When the operating condition is that the passenger compartment circuit is cooled separately, the opening degree of the refrigerant valve corresponding to the passenger compartment circuit is obtained according to the system's energy requirement and the motor outlet water temperature.

[0036] When the operating conditions are battery circuit cooling alone, passenger compartment circuit heating alone, and battery circuit heating alone, the opening degree of the refrigerant valve corresponding to the battery circuit is obtained according to the system's energy demand and the motor outlet water temperature.

[0037] The present invention also proposes a control system for a vehicle heat pump system, comprising:

[0038] The acquisition unit is used to acquire the operating conditions of the vehicle heat pump system, the motor outlet water temperature in the motor circuit and the cooler inlet water temperature in the battery circuit, the air inlet parameters, air outlet parameters and air volume passing through the evaporator in the passenger compartment circuit, and the battery parameters and water pump flow rate in the battery circuit.

[0039] The passenger compartment energy calculation unit is used to calculate the energy requirement of the passenger compartment based on the air intake parameters, air outlet parameters, and air volume.

[0040] The battery energy calculation unit is used to calculate the battery's energy demand based on battery parameters and water pump flow rate.

[0041] The system energy calculation unit is used to calculate the system's energy requirements based on the energy requirements of the crew cabin and the battery.

[0042] The compressor speed acquisition unit is used to obtain the compressor speed based on the operating conditions, the system energy demand, the motor outlet water temperature, or the cooler inlet water temperature.

[0043] The refrigerant valve opening degree acquisition unit is used to obtain the refrigerant valve opening degree based on the operating conditions, the system energy demand, and the motor outlet water temperature.

[0044] The control unit is used to control the operation of the compressor according to the compressor speed and to adjust the refrigerant valve according to the opening degree of the refrigerant valve.

[0045] The present invention also proposes an electronic device, the electronic device comprising:

[0046] One or more processors;

[0047] A storage device for storing one or more programs that, when executed by one or more processors, cause the electronic device to implement the control method for the vehicle compressor and refrigerant valve as described in any of the preceding embodiments.

[0048] The present invention also proposes a computer-readable storage medium, characterized in that it stores a computer program thereon, which, when executed by a computer processor, causes the computer to perform the control method for the vehicle compressor and refrigerant valve described above.

[0049] The beneficial effects of this invention are as follows: This invention proposes a control method, system, equipment, and medium for a vehicle heat pump system. First, it acquires the operating conditions of the heat pump system, the motor outlet water temperature, the cooler inlet water temperature, the evaporator inlet air parameters, the evaporator outlet air parameters, and the air volume passing through the evaporator, as well as the battery parameters and water pump flow rate in the battery circuit. Second, based on the inlet air parameters, outlet air parameters, and air volume, the energy demand of the passenger compartment can be calculated. Based on the battery parameters and water pump flow rate, the energy demand of the battery can be calculated. The energy demand of the passenger compartment and the energy demand of the battery are added together to obtain the system energy demand. Based on the operating conditions, system energy demand, and motor outlet water temperature or cooler inlet water temperature, the corresponding compressor speed is obtained, and based on the operating conditions, the system energy demand, and motor outlet water temperature, the corresponding refrigerant valve opening is obtained. Then, the compressor operation is controlled according to the compressor speed, and the refrigerant valve is adjusted according to the refrigerant valve opening. Thus, the system energy demand is used as a unified thermal management energy index to control the compressor and refrigerant valve, thereby achieving effective optimization of energy drive and avoiding over-cooling or over-heating. Attached Figure Description

[0050] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0051] In the attached diagram:

[0052] Figure 1 This is a schematic diagram showing the independent connection of the passenger compartment circuit and the battery circuit in a vehicle heat pump system provided in one embodiment of the present invention.

[0053] Figure 2 This is a schematic diagram showing the connection between the passenger compartment circuit and the battery circuit in a vehicle heat pump system provided in one embodiment of the present invention.

[0054] Figure 3 This is a schematic diagram of the steps of a control method for a vehicle heat pump system provided in one embodiment of the present invention.

[0055] Figure 4 This is a structural block diagram of a control method for a vehicle heat pump system provided in one embodiment of the present invention.

[0056] Figure 5 This is a structural block diagram of an electronic device provided in one embodiment of the present invention. Detailed Implementation

[0057] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0058] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0059] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the invention. However, it will be apparent to those skilled in the art that embodiments of the invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the invention.

[0060] Please see Figures 1 to 5 This invention proposes a control method, system, equipment, and medium for a vehicle heat pump system, applicable to the field of new energy vehicles, specifically in the control of heat pump systems in new energy vehicles. This invention sums the cooling / heating energy of the passenger compartment circuit and the battery circuit to obtain the system's required energy. This required energy is then used as a unified thermal management energy index to control the compressor and refrigerant valves, thereby achieving effective optimization of energy drive and avoiding over-cooling or over-heating. A more detailed description follows with specific embodiments.

[0061] Please see Figure 1 and Figure 2 This is a schematic diagram illustrating the connection between the passenger compartment circuit and the battery circuit in the vehicle heat pump system of this invention. Figure 1 As shown, when the passenger compartment circuit 10 and the battery circuit 30 in the vehicle heat pump system are independent, it is possible to achieve independent cooling or heating of the passenger compartment circuit 10, independent cooling or heating of the battery circuit 30, cooling of the passenger compartment circuit 10 and heating of the battery circuit 30, or heating of the passenger compartment circuit 10 and cooling of the battery circuit 30. Figure 2 As shown, when the passenger compartment circuit 10 and the battery circuit 30 in the vehicle heat pump system are connected, simultaneous cooling or heating of the passenger compartment circuit 10 and the battery circuit 30 can be achieved. The motor circuit 20 and the compressor circuit 40 can be adaptively connected to the passenger compartment circuit 10 and the battery circuit 30 based on different operating conditions.

[0062] Please see Figure 3 In one embodiment of the present invention, a control method for a vehicle heat pump system is proposed, which may include the following steps.

[0063] Step S10: Obtain the operating conditions of the vehicle heat pump system, the motor outlet water temperature in the motor circuit and the cooler inlet water temperature in the battery circuit, obtain the air inlet parameters, air outlet parameters and air volume passing through the evaporator in the passenger compartment circuit, and obtain the battery parameters and water pump flow rate in the battery circuit.

[0064] In one embodiment of the present invention, since the present invention is for the coordinated control of thermal management of the passenger compartment circuit and the battery circuit, the operating conditions may include the following eight conditions: individual cooling or individual heating of the passenger compartment circuit 10, individual cooling or individual heating of the battery circuit 30, cooling of the passenger compartment circuit 10 and heating of the battery circuit 30, heating of the passenger compartment circuit 10 and cooling of the battery circuit 30, simultaneous cooling of the passenger compartment circuit 10 and the battery circuit 30, and simultaneous heating of the passenger compartment circuit 10 and the battery circuit 30.

[0065] Specifically, the evaporator's air intake parameters can include air intake temperature and air intake humidity. Air intake temperature refers to the temperature of the air entering the evaporator, and air intake humidity refers to the humidity of the air entering the evaporator. The calculation of air intake humidity can be based on the humidity inside and outside the vehicle, according to the ratio of internal and external air circulation dampers, to calculate the mixed air intake humidity.

[0066] Specifically, the air outlet parameters of the evaporator may include air outlet temperature and air outlet humidity. Air outlet temperature refers to the air temperature after passing through the evaporator, and air outlet humidity refers to the air humidity after passing through the evaporator.

[0067] Step S20: Calculate the energy requirement of the passenger compartment based on the air intake parameters, air outlet parameters, and air volume.

[0068] In one embodiment of the present invention, step S20 may include the following steps.

[0069] Step S210: Obtain the corresponding inlet enthalpy value based on the inlet air temperature and inlet air humidity in the inlet air parameters, and obtain the corresponding outlet enthalpy value based on the outlet air temperature and outlet air humidity in the outlet air parameters.

[0070] Specifically, the corresponding inlet enthalpy is obtained based on the inlet air temperature and humidity parameters, and the corresponding outlet enthalpy is obtained based on the outlet air temperature and humidity parameters. For example, the corresponding inlet and outlet enthalpy values ​​are obtained based on the enthalpy-humidity diagram between temperature, humidity, and enthalpy, and the following enthalpy value tables are provided. In Tables 1 and 2, the unit of temperature is °C, and the unit of enthalpy is KJ / kg.

[0071] Table 1. Enthalpy values ​​between inlet air temperature, inlet air humidity, and inlet air enthalpy.

[0072]

[0073] Table 2. Enthalpy values ​​between outlet air temperature, outlet air humidity, and outlet air enthalpy (outlet air humidity is set at 100%).

[0074]

[0075] Step S220: Calculate the enthalpy difference between the inlet enthalpy and the outlet enthalpy, and calculate the product of the enthalpy difference and the air volume to obtain the energy requirement of the occupant cabin.

[0076] Specifically, the energy required for the passenger cabin = air volume * (inlet enthalpy - outlet enthalpy).

[0077] For example, when the passenger compartment circuit is in cooling mode, the inlet enthalpy is greater than the outlet enthalpy, and the difference between the two is positive. When the passenger compartment circuit is in heating mode, the outlet enthalpy is greater than the inlet enthalpy, and the difference between the two is positive.

[0078] Step S30: Calculate the battery energy requirement based on battery parameters and water pump flow rate.

[0079] In one embodiment of the present invention, step S30 may include the following steps.

[0080] Step S310: Calculate the temperature difference between the battery inlet water temperature and the battery average water temperature in the battery parameters.

[0081] Step S320: Obtain the corresponding heat transfer coefficient based on the water pump flow rate in the battery parameters.

[0082] Step S330: Calculate the product of the water temperature difference and the heat transfer coefficient to obtain the battery's energy requirement.

[0083] Specifically, the heat transfer coefficient can be obtained from the water pump flow rate in the battery parameters. The heat transfer coefficient table is as follows. In Table 3, the unit of water pump flow rate is L / min.

[0084] Table 3. Heat transfer coefficients corresponding to water pump flow rates

[0085] water pump flow rate 10 15 20 25 heat transfer coefficient 200 300 400 500

[0086] Specifically, the battery energy requirement = heat transfer coefficient * (battery inlet water temperature - battery average water temperature).

[0087] For example, when the battery circuit is in cooling mode, the average battery water temperature is higher than the battery inlet water temperature, and the difference between the average battery water temperature and the battery inlet water temperature is positive. When the battery circuit is in heating mode, the battery inlet water temperature is higher than the average battery water temperature, and the difference between the battery inlet water temperature and the average battery water temperature is positive.

[0088] Step S40: Calculate the system energy requirement based on the energy requirements of the crew cabin and the battery.

[0089] Specifically, the system's energy requirement can be obtained by adding the energy demand of the crew cabin and the energy demand of the battery.

[0090] Step S50: Obtain the compressor speed based on the operating conditions, the system energy demand, the motor outlet water temperature, or the cooler inlet water temperature.

[0091] In one embodiment of the present invention, step S50 may include the following steps.

[0092] Step S510: Determine the operating conditions.

[0093] Step S520: When the operating condition is that the crew compartment circuit is cooled separately and / or the battery circuit is cooled separately, the compressor speed is obtained according to the system's energy requirement and the motor outlet water temperature.

[0094] Specifically, based on the calculated system energy demand and the real-time detected motor outlet water temperature, a compressor speed is obtained by querying a preset mapping relationship for the refrigeration operating conditions. This mapping relationship was calibrated through extensive bench tests during the system design phase. It establishes a reference compressor speed for quickly approaching control targets, such as evaporator temperature or battery inlet water temperature, under different combinations of system energy demand and motor outlet water temperature. In Table 4, the unit for motor outlet water temperature is °C, the unit for system energy demand is KJ, and the unit for compressor speed is r / min.

[0095] Table 4. Compressor Speed ​​Corresponding to System Energy Requirements and Motor Outlet Water Temperature

[0096]

[0097] Step S530: When the operating conditions are passenger compartment circuit heating alone and / or battery circuit heating alone, or passenger compartment circuit and battery circuit heating simultaneously, the compressor speed is obtained based on the system energy demand and cooler inlet water temperature.

[0098] Specifically, based on the system's energy demand and the real-time detected cooler inlet water temperature, the compressor speed is obtained by querying another set of pre-set mapping relationships specifically for heating conditions. This mapping relationship has also been precisely calibrated, defining the initial compressor speed value that should be set to effectively achieve heating targets, such as the condenser inlet temperature of the low-temperature circuit, under different system energy demands and different cooler inlet water temperatures. In this way, it can quickly adapt to changes in the external ambient temperature, automatically increasing the compressor speed to ensure heating capacity in low-temperature environments, and appropriately reducing the speed to optimize energy efficiency in higher temperatures, ensuring the reliability and economy of the system performance in heating mode. In Table 5, the unit of cooler inlet water temperature is °C, the unit of system energy demand is KJ, and the unit of compressor speed is r / min. This mapping relationship was calibrated through extensive bench tests during the system design phase.

[0099] Table 5. System Energy Requirement and Compressor Speed ​​Corresponding to Cooler Inlet Water Temperature

[0100]

[0101] In one embodiment of the present invention, step S530 may include the following steps.

[0102] Step S531: When the operating condition is that the crew compartment circuit is heated alone and / or the battery circuit is heated alone, the initial speed is obtained according to the system's energy requirement and the cooler inlet water temperature in the preset compressor speed mapping relationship.

[0103] Specifically, the initial speed of the compressor can be found in the compressor speed table 5.

[0104] Step S532: Obtain the target outlet temperature and the actual outlet temperature of the cryogenic circuit condenser in the crew compartment circuit; calculate the difference between the target outlet temperature and the actual outlet temperature to obtain the outlet temperature difference.

[0105] Step S533: Obtain the corresponding proportional parameters based on the outlet temperature difference and the system energy requirement.

[0106] In Table 6, the unit of the outlet temperature difference is °C, the unit of the system energy demand is KJ, and the proportional parameter is a non-zero constant. This mapping relationship was calibrated through a large number of bench tests during the system design phase.

[0107] Table 6. Proportional Parameters Corresponding to Outlet Temperature Difference and System Energy Demand

[0108]

[0109] Step S534: Obtain the corresponding integral parameters based on the outlet temperature difference and the system energy requirement.

[0110] In Table 7, the unit of the outlet temperature difference is °C, the unit of the system energy demand is KJ, and the integral parameter is a non-zero constant. This mapping relationship was calibrated through a large number of bench tests during the system design phase.

[0111] Table 7. Integral parameters corresponding to outlet temperature difference and system energy demand.

[0112]

[0113] Step S535: Obtain the corrected rotational speed based on the proportional parameter, integral parameter, and outlet temperature difference.

[0114] Step S536: Calculate the sum of the initial speed and the corrected speed to obtain the compressor speed.

[0115] Specifically, the corrected compressor speed V1 satisfies:

[0116] Where V0 represents the initial rotational speed, K p Let K be a proportional parameter, where e(k) represents the inlet temperature difference at the current moment. i Let e(n) be the integral parameter, representing the inlet temperature difference at historical moments. This indicates the corrected rotational speed.

[0117] Step S60: Based on the operating conditions, the system's energy requirements, and the motor outlet water temperature, obtain the refrigerant valve opening degree.

[0118] In one embodiment of the present invention, step S60 may include the following steps.

[0119] Step S610: Determine the operating conditions.

[0120] Step S620: When the operating condition is that the passenger compartment circuit is cooled separately, the opening degree of the refrigerant valve corresponding to the passenger compartment circuit is obtained according to the system's energy requirement and the motor outlet water temperature.

[0121] In Table 8, the unit of motor outlet water temperature is ℃, the unit of system energy demand is KJ, and the refrigerant valve opening is a non-zero constant in percentage. This mapping relationship was calibrated through a large number of bench tests during the system design phase.

[0122] Table 8. Refrigerant Valve Openings Corresponding to Motor Outlet Water Temperature and System Energy Demand

[0123]

[0124] Step S630: When the operating conditions are battery circuit cooling alone, passenger compartment circuit heating alone, and battery circuit heating alone, the opening degree of the refrigerant valve corresponding to the battery circuit is obtained according to the system's energy demand and the motor outlet water temperature.

[0125] In Table 9, the unit for motor outlet water temperature is ℃, the unit for system energy demand is KJ, and the refrigerant valve opening is a non-zero constant in percentage. This mapping relationship was calibrated through a large number of bench tests during the system design phase.

[0126] Table 9. Refrigerant Valve Openings Corresponding to Motor Outlet Water Temperature and System Energy Demand

[0127]

[0128] Step S70: Control the compressor operation according to the compressor speed and adjust the refrigerant valve according to the refrigerant valve opening.

[0129] In one embodiment of the present invention, the compressor speed is adjusted in real time based on the system's energy demand, and the opening degree of the refrigerant valve is dynamically adjusted according to the system's energy demand.

[0130] Therefore, by summing the cooling / heating energy of the crew compartment circuit and the battery circuit to obtain the system's required energy, and using the system's required energy as a unified thermal management energy index, the compressor and refrigerant valve can be controlled, thereby achieving effective optimization of energy drive and avoiding overcooling or overheating.

[0131] Please see Figure 4 In one embodiment of the present invention, a control system 100 for a vehicle heat pump system may be provided, which may include an acquisition unit 110, a passenger compartment energy calculation unit 120, a battery energy calculation unit 130, a system energy calculation unit 140, a compressor speed acquisition unit 150, a refrigerant valve opening acquisition unit 160, and a control unit 170.

[0132] The acquisition unit 110 is used to acquire the operating conditions of the vehicle heat pump system, the motor outlet water temperature in the motor circuit and the cooler inlet water temperature in the battery circuit, the air inlet parameters, air outlet parameters and air volume passing through the evaporator in the passenger compartment circuit, and the battery parameters and water pump flow rate in the battery circuit.

[0133] The passenger compartment energy calculation unit 120 is used to calculate the energy required by the passenger compartment based on the air intake parameters, air outlet parameters, and air volume.

[0134] The battery energy calculation unit 130 is used to calculate the battery energy demand based on battery parameters and water pump flow rate.

[0135] The system energy calculation unit 140 is used to calculate the system energy requirement based on the energy requirements of the crew cabin and the battery.

[0136] The compressor speed acquisition unit 150 is used to obtain the compressor speed based on the operating conditions, the system energy demand, the motor outlet water temperature, or the cooler inlet water temperature.

[0137] The refrigerant valve opening acquisition unit 160 is used to obtain the refrigerant valve opening based on the operating conditions, the system energy demand, and the motor outlet water temperature.

[0138] The control unit 170 is used to control the operation of the compressor according to the compressor speed and to adjust the refrigerant valve according to the opening degree of the refrigerant valve.

[0139] Please see Figure 5In one embodiment of the present invention, an electronic device 200 is proposed. The electronic device 200 may include a memory 210, a processor 220 and a bus, and may also include a computer program stored in the memory 210 and executable on the processor 220, such as a control program for a vehicle heat pump system.

[0140] The memory 210 includes at least one type of readable storage medium, such as flash memory, portable hard drive, multimedia card, card-type memory (e.g., SD or DX memory), magnetic memory, magnetic disk, optical disk, etc. In some embodiments, the memory 210 can be an internal storage unit of the electronic device 200, such as the portable hard drive of the electronic device 200. In other embodiments, the memory 210 can be an external storage device of the electronic device 200, such as a plug-in portable hard drive, smart media card (SMC), secure digital card (SD), flash card, etc., equipped on the electronic device 200. Furthermore, the memory 210 can include both internal and external storage units of the electronic device 200. The memory 210 can be used not only to store application software and various types of data installed on the electronic device 200, such as control code for a vehicle heat pump system, but also to temporarily store data that has been output or will be output.

[0141] In some embodiments, processor 220 may be composed of integrated circuits, such as a single packaged integrated circuit or multiple integrated circuits packaged with the same or different functions, including combinations of one or more central processing units (CPUs), microprocessors, digital processing chips, graphics processors, and various control chips. Processor 220 is the control unit of the electronic device 200, connecting various components of the electronic device 200 via various interfaces and lines. It executes programs or modules stored in the memory 210 (e.g., control programs for vehicle heat pump systems) and calls data stored in the memory 210 to perform various functions and process data of the electronic device 200.

[0142] The processor 220 executes the operating system of the electronic device 200 and various installed applications. The processor 220 executes the applications to implement the steps in the control method of the vehicle heat pump system described above.

[0143] For example, the computer program may be divided into one or more modules, which are stored in the memory 210 and executed by the processor 220 to complete this application. The one or more modules may be a series of computer program instruction segments capable of performing specific functions, which describe the execution process of the computer program in the electronic device 200. For example, the computer program may be divided into an acquisition unit 110, a passenger compartment energy calculation unit 120, a battery energy calculation unit 130, a system energy calculation unit 140, a compressor speed acquisition unit 150, a refrigerant valve opening acquisition unit 160, and a control unit 170.

[0144] The integrated unit implemented as a software functional module described above can be stored in a computer-readable storage medium, which can be non-volatile or volatile. The software functional module, stored in the storage medium, includes several instructions to cause a computer device (which may be a personal computer, computer equipment, or network device, etc.) or processor to execute some functions of the control method for the vehicle heat pump system described in the various embodiments of this application.

[0145] In summary, this invention proposes a control method, system, equipment, and medium for a vehicle heat pump system. First, it acquires the operating conditions of the heat pump system, the motor outlet water temperature, the cooler inlet water temperature, the evaporator's inlet and outlet air parameters and the airflow through the evaporator, as well as the battery parameters and water pump flow rate in the battery circuit. Second, based on the inlet and outlet air parameters and airflow, the energy requirement of the passenger compartment can be calculated. Based on the battery parameters and water pump flow rate, the energy requirement of the battery can be calculated. The energy requirement of the passenger compartment and the energy requirement of the battery are then added together to obtain the system energy requirement. Based on the operating conditions, system energy requirement, and motor outlet water temperature or cooler inlet water temperature, the corresponding compressor speed is obtained, as well as the corresponding refrigerant valve opening. Then, the compressor operation is controlled based on the compressor speed, and the refrigerant valve is adjusted based on the refrigerant valve opening. This uses the system energy requirement as a unified thermal management energy index to control the compressor and refrigerant valve, thereby achieving effective optimization of energy drive and avoiding over-cooling or over-heating.

[0146] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A control method for a vehicle heat pump system, characterized in that, include: The system obtains the operating conditions of the vehicle's heat pump system, the water temperature at the motor outlet in the motor circuit, the water temperature at the cooler in the battery circuit, the air inlet parameters, air outlet parameters, and air volume passing through the evaporator in the passenger compartment circuit, and the battery parameters and water pump flow rate in the battery circuit. Calculate the energy requirement of the passenger compartment based on the air intake parameters, air outlet parameters, and air volume; Calculate the battery energy requirement based on battery parameters and water pump flow rate; The system's energy requirements are calculated based on the energy requirements of the crew cabin and the battery. The compressor speed is obtained based on the operating conditions, the system energy demand, and the motor outlet water temperature or cooler inlet water temperature. The refrigerant valve opening is obtained based on the operating conditions, the system's energy requirements, and the motor outlet water temperature. The compressor operation is controlled according to the compressor speed, and the refrigerant valve is adjusted according to the refrigerant valve opening.

2. The control method for a vehicle heat pump system according to claim 1, characterized in that, The step of calculating the energy requirement of the passenger compartment based on the air intake parameters, air outlet parameters, and air volume includes: The corresponding inlet enthalpy value is obtained based on the inlet air temperature and inlet air humidity in the inlet air parameters, and the corresponding outlet enthalpy value is obtained based on the outlet air temperature and outlet air humidity in the outlet air parameters. Calculate the enthalpy difference between the intake and exhaust air values, and then multiply the enthalpy difference by the air volume to obtain the energy requirement of the occupant cabin.

3. The control method for a vehicle heat pump system according to claim 1, characterized in that, The step of calculating the battery's energy requirement based on battery parameters and water pump flow rate includes: Calculate the temperature difference between the battery inlet water temperature and the battery average water temperature in the battery parameters. The corresponding heat transfer coefficient is obtained from the water pump flow rate in the battery parameters; The energy required by the battery is obtained by multiplying the water temperature difference and the heat transfer coefficient.

4. The control method for a vehicle heat pump system according to claim 1, characterized in that, The step of obtaining the compressor speed based on the operating conditions, the system energy demand, and the motor outlet water temperature or cooler inlet water temperature includes: Determine the operating condition: When the operating condition is that the crew cabin circuit is cooled separately and / or the battery circuit is cooled separately, the compressor speed is obtained according to the system's energy requirement and the motor outlet water temperature; When the operating conditions are that the crew compartment circuit is heated alone and / or the battery circuit is heated alone, or the crew compartment circuit and the battery circuit are heated simultaneously, the compressor speed is obtained based on the system's energy demand and the cooler inlet water temperature.

5. The control method for a vehicle heat pump system according to claim 4, characterized in that, When the operating condition is that the crew compartment circuit is heated alone and / or the battery circuit is heated alone, the step of obtaining the compressor speed based on the system's energy demand and the cooler inlet water temperature includes: When the operating condition is that the crew compartment circuit is heated alone and / or the battery circuit is heated alone, the initial speed is obtained according to the system's energy demand and the cooler inlet water temperature in the preset compressor speed mapping relationship; Obtain the target outlet temperature and the actual outlet temperature of the cryogenic loop condenser in the crew compartment loop; calculate the difference between the target outlet temperature and the actual outlet temperature to obtain the outlet temperature difference. The corresponding proportional parameters are obtained based on the outlet temperature difference and the system energy demand. The corresponding integral parameters are obtained based on the outlet temperature difference and the system energy demand. The corrected rotational speed is obtained based on the proportional parameter, integral parameter, and outlet temperature difference. The compressor speed is obtained by summing the initial speed and the corrected speed.

6. The control method for a vehicle heat pump system according to claim 5, characterized in that, The corrected compressor speed V2 satisfies: Where V0 represents the initial rotational speed, K p Let K be a proportional parameter, where e(k) represents the inlet temperature difference at the current moment. i Let e(n) be the integral parameter, representing the inlet temperature difference at historical moments. This indicates the corrected rotational speed.

7. The control method for a vehicle heat pump system according to claim 1, characterized in that, The step of obtaining the refrigerant valve opening degree based on the operating conditions, the system energy demand, and the motor outlet water temperature includes: Determine the operating condition: When the operating condition is that the passenger compartment circuit is cooled separately, the opening degree of the refrigerant valve corresponding to the passenger compartment circuit is obtained according to the system's energy requirement and the motor outlet water temperature. When the operating conditions are battery circuit cooling alone, passenger compartment circuit heating alone, and battery circuit heating alone, the opening degree of the refrigerant valve corresponding to the battery circuit is obtained according to the system's energy demand and the motor outlet water temperature.

8. A control system for a vehicle heat pump system, characterized in that, include: The acquisition unit is used to acquire the operating conditions of the vehicle heat pump system, the motor outlet water temperature in the motor circuit and the cooler inlet water temperature in the battery circuit, the air inlet parameters, air outlet parameters and air volume passing through the evaporator in the passenger compartment circuit, and the battery parameters and water pump flow rate in the battery circuit. The passenger compartment energy calculation unit is used to calculate the energy requirement of the passenger compartment based on the air intake parameters, air outlet parameters, and air volume. The battery energy calculation unit is used to calculate the battery's energy demand based on battery parameters and water pump flow rate. The system energy calculation unit is used to calculate the system's energy requirements based on the energy requirements of the crew cabin and the battery. The compressor speed acquisition unit is used to obtain the compressor speed based on the operating conditions, the system energy demand, the motor outlet water temperature, or the cooler inlet water temperature. The refrigerant valve opening degree acquisition unit is used to obtain the refrigerant valve opening degree based on the operating conditions, the system energy demand, and the motor outlet water temperature. The control unit is used to control the operation of the compressor according to the compressor speed and to adjust the refrigerant valve according to the opening degree of the refrigerant valve.

9. An electronic device, characterized in that, The electronic device includes: One or more processors; A storage device for storing one or more programs, which, when executed by one or more processors, cause the electronic device to implement the control method of the vehicle compressor and refrigerant valve as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, It stores a computer program that, when executed by the computer's processor, causes the computer to perform the control method for the vehicle compressor and refrigerant valve as described in any one of claims 1 to 7.

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