Control method, device and equipment of vehicle heating system, vehicle and storage medium

Abstract

A control method, apparatus, device, vehicle, and storage medium for a vehicle heating system are disclosed. The method includes: acquiring ambient temperature, passenger compartment data, the inlet pressure of a first electronic expansion valve (33), and the intake pressure of a second electronic expansion valve (36) in real time; starting a heat pump (31), an internal heat exchanger (32), an external heat exchanger (34), and an electromagnetic switch (35); starting the first electronic expansion valve (33) at a first initial opening degree and starting the second electronic expansion valve (36) at a second initial opening degree; automatically controlling the first electronic expansion valve (33) according to the inlet pressure and a preset target inlet pressure, such that the opening degree of the first electronic expansion valve (33) automatically changes with the inlet pressure according to a first preset correspondence; and automatically controlling the second electronic expansion valve (36) according to the intake pressure and a preset target intake pressure, such that the opening degree of the second electronic expansion valve (36) automatically changes with the intake pressure according to a second preset correspondence. Therefore, the overall vehicle cost can be reduced.

Description

Control method, device, equipment, vehicle and storage medium for vehicle heating system

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 28, 2023, with application number 2023118668064 and application name “Control method, device, equipment, vehicle and storage medium for vehicle heating system”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to, but is not limited to, the field of vehicle technology, and in particular to a control method, device, equipment, vehicle, and storage medium for a vehicle heating system. Background Art

[0003] With the increasing popularity of new energy vehicles, installing heating systems in vehicles is a common approach to increasing the range of pure electric vehicles and reducing energy consumption. How to achieve this while reducing vehicle production costs has become a hot topic in new energy vehicle research. Conventional vehicle heating systems increase vehicle costs.

[0004] Therefore, a control method for a vehicle heat pump system is urgently needed to improve the above technical problems. Summary of the Invention

[0005] The following is a brief summary of subject matter that is described in detail herein. This summary is not intended to be liming as to the scope of the claims.

[0006] The present application provides a control method, device, equipment, vehicle and storage medium for a vehicle heating system, which can reduce the overall vehicle cost.

[0007] The purpose of the present invention is achieved by the following technical solutions:

[0008] In a first aspect, the present application provides a method for controlling a vehicle heating system, the vehicle heating system comprising: a heat pump, an internal heat exchanger, a first electronic expansion valve, an external heat exchanger, an electromagnetic switch, and a second electronic expansion valve; wherein an output end of the heat pump is in communication with an input end of the internal heat exchanger, an output end of the internal heat exchanger is in communication with an input end of the first electronic expansion valve, an output end of the first electronic expansion valve is in communication with an input end of an external heat exchanger, an output end of the external heat exchanger and an output end of the second electronic expansion valve are both in communication with an input end of the heat pump, the external heat exchanger is electrically connected to the electromagnetic switch, and an input end of the second electronic expansion valve is in communication with an output end of the heat pump;

[0009] The method is applied to a vehicle controller and includes:

[0010] acquiring in real time the ambient temperature, passenger compartment data, the pressure upstream of the first electronic expansion valve, and the suction pressure of the second electronic expansion valve;

[0011] If it is detected that the ambient temperature is less than an external temperature threshold, the heat pump, the internal heat exchanger, the external heat exchanger, and the electromagnetic switch are activated, and the first electronic expansion valve is activated at a first initial opening degree, and the second electronic expansion valve is activated at a second initial opening degree, wherein the first initial opening degree is determined based on the ambient temperature, and the second initial opening degree is determined based on the passenger compartment data and the ambient temperature;

[0012] automatically controlling the first electronic expansion valve according to the upstream pressure and a preset target upstream pressure, so that the opening of the first electronic expansion valve automatically changes with changes in the upstream pressure according to a first preset corresponding relationship, and the difference between the upstream pressure and the suction pressure is within a preset difference range;

[0013] If it is detected that the second initial opening is less than a preset opening limit, the second electronic expansion valve is automatically controlled according to the intake pressure and a preset target intake pressure, so that the opening of the second electronic expansion valve automatically changes with the change of the intake pressure according to a second preset corresponding relationship.

[0014] In one possible implementation, the passenger compartment data includes a passenger compartment thermal load; accordingly, the second initial opening is determined based on the passenger compartment data and the ambient temperature, including: the second initial opening is determined based on the passenger compartment thermal load data and the ambient temperature.

[0015] In one possible implementation, the first electronic expansion valve is automatically controlled according to the inlet pressure and the preset target inlet pressure, so that the opening of the first electronic expansion valve automatically changes with the change of the inlet pressure according to a first preset corresponding relationship, including: the first electronic expansion valve is automatically controlled according to the automatic control algorithm PID according to the inlet pressure and the preset target inlet pressure, so that the first electronic expansion valve automatically changes with the change of the inlet pressure according to the corresponding relationship that the opening is inversely proportional to the inlet pressure, and the difference between the inlet pressure and the suction pressure is within a preset difference range.

[0016] In one possible implementation, the second electronic expansion valve is automatically controlled according to the difference between the intake pressure and a preset pressure target, so that the opening of the second electronic expansion valve automatically changes with the change of the intake pressure according to a second preset corresponding relationship, including: determining the intake pressure difference according to the intake pressure and the preset target intake pressure; and automatically controlling the second electronic expansion valve according to a step-by-step approximation automatic control algorithm based on the intake pressure difference, so that the opening of the second electronic expansion valve automatically changes with the change of the passenger compartment data or the ambient temperature according to a corresponding relationship in which the opening is proportional to the intake pressure.

[0017] In one possible implementation, the method further includes: obtaining the intake temperature of the first electronic expansion valve in real time; if it is detected that the intake temperature is greater than a temperature limit, correcting the preset target upstream pressure according to the corresponding relationship in which the target upstream pressure is inversely proportional to the intake temperature to obtain an updated target upstream pressure, and jumping to the step of automatically controlling the first electronic expansion valve based on the upstream pressure and the preset target upstream pressure.

[0018] In one possible implementation, the passenger compartment data includes the outlet air temperature of the heating communication and air conditioning condition system; accordingly, after the real-time acquisition of the ambient temperature, passenger compartment data, the valve front pressure of the first electronic expansion valve and the suction pressure of the second electronic expansion valve, it also includes: obtaining the system operation time of the vehicle heating system; if it is detected that the second initial opening is greater than or equal to the preset opening limit, then the temperature difference is determined according to the outlet air temperature of the heating communication and air conditioning condition system and the preset target temperature; if it is detected that the temperature difference is greater than the preset temperature difference threshold, or the system operation time reaches the preset time threshold, then jump to the step of automatically controlling the second electronic expansion valve according to the suction pressure and the preset target suction pressure, so that the opening of the second electronic expansion valve automatically changes with the change of the passenger compartment data or the ambient temperature according to the second preset corresponding relationship.

[0019] In a possible implementation, the method further includes: if it is detected that the ambient temperature is greater than or equal to an external temperature threshold, controlling the second electronic expansion valve and the electromagnetic switch to close.

[0020] In a possible implementation, the method further includes: obtaining the temperature of a control circuit board PCBA of the heat pump in real time; and if it is detected that the PCBA temperature exceeds a preset calibration value, controlling the opening of the first electronic expansion valve and the opening of the second electronic expansion valve to remain unchanged.

[0021] In a second aspect, the present application provides a control device for a vehicle heating system, the vehicle heating system comprising: a heat pump, an internal heat exchanger, a first electronic expansion valve, an external heat exchanger, an electromagnetic switch, and a second electronic expansion valve; wherein the output end of the heat pump is in communication with the input end of the internal heat exchanger, the output end of the internal heat exchanger is in communication with the input end of the first electronic expansion valve, the output end of the first electronic expansion valve is in communication with the input end of the external heat exchanger, the output end of the external heat exchanger and the output end of the second electronic expansion valve are both in communication with the input end of the heat pump, the external heat exchanger is electrically connected to the electromagnetic switch, and the input end of the second electronic expansion valve is in communication with the output end of the heat pump;

[0022] The device is applied to a vehicle controller and includes:

[0023] an acquisition module, configured to acquire in real time the ambient temperature, passenger compartment data, the pressure upstream of the first electronic expansion valve, and the suction pressure of the second electronic expansion valve;

[0024] a starting module, configured to, if it is detected that the ambient temperature is less than an external temperature threshold, start the heat pump, the internal heat exchanger, the external heat exchanger, and the electromagnetic switch, and start the first electronic expansion valve at a first initial opening degree, and start the second electronic expansion valve at a second initial opening degree, wherein the first initial opening degree is determined based on the ambient temperature, and the second initial opening degree is determined based on the passenger compartment data and the ambient temperature;

[0025] a control module, configured to automatically control the first electronic expansion valve according to the upstream pressure and a preset target upstream pressure, so that the opening of the first electronic expansion valve automatically changes with changes in the upstream pressure according to a first preset corresponding relationship, and the difference between the upstream pressure and the suction pressure is within a preset difference range;

[0026] The control module is further configured to automatically control the second electronic expansion valve according to the suction pressure and a preset target suction pressure if it is detected that the second initial opening is less than a preset opening limit, so that the opening of the second electronic expansion valve automatically changes with changes in the suction pressure according to a second preset corresponding relationship.

[0027] In a third aspect, the present application provides a control device for a vehicle heating system, comprising: at least one processor and a memory;

[0028] The memory stores computer-executable instructions;

[0029] The at least one processor executes the computer-executable instructions stored in the memory, so that the at least one processor performs the control method of the vehicle heating system as described in the first aspect above.

[0030] In a fourth aspect, the present application provides a vehicle comprising: a vehicle body, and a control device of the vehicle heating system as described in the third aspect, which is arranged in the vehicle body.

[0031] In a fourth aspect, the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer-executed instruction. When a processor executes the computer-executed instruction, the vehicle heating system control method described in the first aspect above is implemented.

[0032] The present application provides a vehicle heating system control method, apparatus, device, vehicle, and storage medium. These methods control a vehicle heating system having only a heat pump as a heating source. When the vehicle's ambient temperature is detected to be less than an external temperature threshold, the method activates the heat pump, internal heat exchanger, external heat exchanger, and electromagnetic switch. The method also activates the first electronic expansion valve at a first initial opening and the second electronic expansion valve at a second initial opening. The method then automatically controls the first electronic expansion valve based on the upstream pressure and a preset target upstream pressure, such that the opening of the first electronic expansion valve automatically changes with changes in the upstream pressure according to a first preset correspondence. If the second initial opening is detected to be less than a preset opening limit, the method automatically controls the second electronic expansion valve based on the intake pressure and a preset target intake pressure, such that the opening of the second electronic expansion valve automatically changes with changes in the intake pressure according to a second preset correspondence. During the entire control process, the refrigerant is heated by the heat pump and divided into two output paths. One path, high-temperature, high-pressure refrigerant, passes through an internal heat exchanger to heat the passenger compartment. After being throttled by the first electronic expansion valve, it becomes a low-temperature, low-pressure two-phase refrigerant, which then returns to the heat pump input through an external heat exchanger. The other path directly passes through the throttling of the second electronic expansion throttle valve, becoming a low-pressure, high-temperature gaseous refrigerant while maintaining its enthalpy. It then mixes with the low-temperature, low-pressure two-phase refrigerant to form a saturated gaseous refrigerant, allowing the refrigerant's enthalpy value to return to the compressor at the node with the highest energy efficiency, thus achieving heating under ultra-low temperature conditions. Therefore, a vehicle heating system with only a heat pump as a heating source and appropriate control can be installed on the vehicle to meet low-temperature usage requirements, reducing the number of components in the vehicle heating system, lowering vehicle costs, and reducing overall vehicle weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings described above are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0034] FIG1 is a schematic flow chart of the working principle of a vehicle heating system including an electric heater system and a heat pump system in an embodiment of a vehicle heating solution provided by an embodiment of the present application;

[0035] FIG2 is a schematic diagram of an application scenario of a control method for a vehicle heating system provided by an embodiment of the present application;

[0036] FIG3 is a schematic diagram of the structural connection of a vehicle heating system provided in an embodiment of the present application;

[0037] FIG4 is a schematic flow chart of a method for controlling a vehicle heating system according to an embodiment of the present application;

[0038] FIG5 is a pressure-enthalpy diagram of an operation process of controlling a vehicle heating system when the ambient temperature is less than an external temperature threshold, provided by an embodiment of the present application;

[0039] FIG6 is a schematic structural diagram of a control device for a vehicle heating system provided in an embodiment of the present application;

[0040] FIG7 is a schematic diagram of the hardware structure of a control device of a vehicle heating system provided in an embodiment of the present application.

[0041] Figure numerals: 31 - heat pump, 32 - internal heat exchanger, 33 - first electronic expansion valve; 34 - external heat exchanger; 35 - electromagnetic switch; 36 - second electronic expansion valve; 61 - acquisition module; 62 - start module; 63 - control module; 701 - processor; 702 - memory; 703 - bus.

[0042] Other aspects will be appreciated upon reading and understanding the attached figures and detailed description. DETAILED DESCRIPTION

[0043] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0044] FIG1 is a schematic flow chart of the working principle of a vehicle heating system including an electric heater system and a heat pump system in an embodiment of a vehicle heating solution provided in an embodiment of the present application.

[0045] As shown in Figure 1, when the ambient temperature is ∈ (-10°C, 10°C), the heat pump is started. The heat pump heats the air by using electricity, and the refrigerant in the external heat exchanger evaporates and absorbs heat, releasing heat energy. The energy efficiency COP of this process is generally between 2 and 3. Although the energy consumption is high, when the environment is below -10°C, it cannot effectively heat the passenger compartment. Therefore, when the ambient temperature is less than -10°C, the electric heater is started, and the high-voltage heater directly heats the refrigerant by using electricity. The energy efficiency COP of this process is about 0.95. It can be seen that when the heat pump system and the electric heater system are configured in the vehicle at the same time, the use of components such as pipelines, water pumps and electric heaters increases the overall cost of the vehicle.

[0046] The embodiments of the present application provide the following technical concept: only a heat pump system is used to form a vehicle heating system, and only an electromagnetic switch and two electronic expansion valves are added to the original heat pump system. By simultaneously and cooperatively deploying the two electronic expansion valves, only the heat generated by the heat pump is used to complete the low-temperature heating process, reducing heating devices such as water pumps, electric heaters and pipelines, thereby reducing the weight of the entire vehicle and reducing the cost of the entire vehicle.

[0047] FIG2 is a schematic diagram of an application scenario of a vehicle heating system control method provided by an embodiment of the present application. As shown in FIG2 , the method includes: a vehicle 101 and a vehicle controller 102 .

[0048] Among them, the vehicle 101 is equipped with a vehicle heating system, a vehicle controller 102 and sensors for collecting ambient temperature, passenger compartment temperature and related parameters of each valve in the vehicle heating system. The vehicle controller 102 is used to control the vehicle heating system to execute the control method of the vehicle heating system when the ambient temperature is lower than a low temperature limit such as -10°C, thereby completing the heating process of the vehicle.

[0049] FIG3 is a schematic diagram of the structural connection of a vehicle heating system provided in an embodiment of the present application.

[0050] FIG4 is a flow chart of a method for controlling a vehicle heating system according to an embodiment of the present application.

[0051] The execution subject of this embodiment may be the vehicle controller 102 in the embodiment shown in FIG. 2 , or may be other controllers, chips, or computer-related devices with control functions, and this embodiment is not particularly limited.

[0052] As shown in FIG3 , the vehicle heating system provided in the embodiment of the present application includes: a heat pump 31 , an internal heat exchanger 32 , a first electronic expansion valve 33 , an external heat exchanger 34 , an electromagnetic switch 35 and a second electronic expansion valve 36 .

[0053] The output end of the heat pump 31 is connected to the input end of the internal heat exchanger 32, the output end of the internal heat exchanger 32 is connected to the input end of the first electronic expansion valve 33, the output end of the first electronic expansion valve 33 is connected to the input end of the external heat exchanger 34, the output end of the external heat exchanger 33 and the output end of the second electronic expansion valve 36 are both connected to the input end of the heat pump 31, the external heat exchanger 34 is electrically connected to the electromagnetic switch 35, and the input end of the second electronic expansion valve 36 is connected to the output end of the heat pump 31.

[0054] As shown in Figure 3, in this embodiment, when the ambient temperature reaches ultra-low temperature conditions, such as below -10°C, the refrigerant is compressed and heated in the heat pump 31 to become high-temperature, high-pressure refrigerant. The high-temperature, high-pressure refrigerant is then divided into two paths from the output end of the heat pump 31. The first path is: the high-temperature, high-pressure refrigerant passes through the internal heat exchanger 32 to heat the passenger compartment, then flows through the first electronic expansion valve 33 to become a low-pressure, low-temperature two-phase refrigerant, and finally flows through the external heat exchanger 34. At this time, the electromagnetic switch 35 is turned on to control the operation of the external heat exchanger 34, allowing the low-temperature, low-pressure refrigerant to flow out of the external heat exchanger 34. The second path is: a portion of the high-temperature, high-pressure refrigerant flows through the second electronic expansion valve 36 to become a low-pressure, high-temperature gaseous refrigerant with constant enthalpy. This low-pressure, high-temperature gaseous refrigerant mixes with the low-temperature, low-pressure refrigerant flowing out of the output end of the external heat exchanger 34 in the first path to form a saturated gaseous refrigerant with a certain enthalpy value, which then returns to the compressor.

[0055] When the temperature exceeds ultra-low temperature conditions, such as above -10°C, the second electronic expansion valve 36 in the second path described in the above embodiment can be closed to reduce energy consumption. The difference from the first path in the above embodiment is that the electromagnetic switch 33 is closed, allowing the expanded refrigerant flowing out of the electronic expansion valve to absorb heat from the environment when passing through the external heat exchanger and then return to the heat pump.

[0056] As shown in FIG4 , the control method of the vehicle heating system is applied to a vehicle controller, including:

[0057] S401: Acquire in real time the ambient temperature, passenger compartment data, the pressure upstream of the first electronic expansion valve, and the suction pressure of the second electronic expansion valve.

[0058] In this embodiment, ambient temperature can be acquired through a temperature sensor collecting the air temperature surrounding the vehicle, while passenger compartment data can be acquired through the vehicle's central control system. This passenger compartment data may include temperature, outlet wind speed, air flow, and other passenger compartment-related data. The pre-valve pressure refers to the pressure of the low-temperature, low-pressure, two-phase refrigerant at the inlet of the first electronic expansion valve's input port. The suction pressure refers to the pressure of the high-temperature, high-pressure refrigerant at the inlet of the second electronic expansion valve's input port.

[0059] S402: If it is detected that the ambient temperature is lower than the external temperature threshold, the heat pump, the internal heat exchanger, the external heat exchanger and the electromagnetic switch are started, and the first electronic expansion valve is started at a first initial opening, and the second electronic expansion valve is started at a second initial opening, wherein the first initial opening is determined according to the ambient temperature, and the second initial opening is determined according to the passenger compartment data and the ambient temperature.

[0060] In this embodiment, the external temperature threshold refers to a manually defined ultra-low temperature value, such as -10°C. When the ambient temperature is below the external temperature threshold, the external heat exchanger cannot absorb heat from the environment. Therefore, a heat pump can be used in conjunction with the first and second electronic expansion valves to heat the passenger compartment.

[0061] In this embodiment, the first initial opening is a fixed initial number of steps used when the first electronic expansion valve is initially activated. The first initial opening may be determined by pre-control based on the ambient temperature. Pre-control refers to matching the ambient temperature with the first initial opening based on the corresponding relationship between the ambient temperature and the first initial opening. Different ambient temperatures result in different matching first initial openings. For example, if the ambient temperature is -15 degrees Celsius, the matched initial opening may be 100%.

[0062] The second initial opening degree is a fixed initial step number used when the second electronic expansion valve is initially activated. The second initial opening degree may be determined by pre-control based on passenger compartment data and ambient temperature.

[0063] Specifically, in an optional embodiment of the present application, the passenger compartment data includes the passenger compartment thermal load. Accordingly, the second initial opening in step S402 is determined based on the passenger compartment data and the ambient temperature, including: the second initial opening is determined based on the passenger compartment thermal load data and the ambient temperature.

[0064] In this embodiment, the passenger compartment thermal load can be understood as treating the passenger compartment as a heat-consuming device. The passenger compartment thermal load can be determined by calculating the amount of heat consumed by the passenger compartment over a certain period of time. Both the passenger compartment thermal load and the ambient temperature influence the determination of the second initial opening. The relationship is as follows: the greater the passenger compartment thermal load, the greater the second initial opening of the second electronic expansion valve 2, and vice versa. Furthermore, the lower the ambient temperature, the greater the second initial opening of the electronic expansion valve, and vice versa.

[0065] S403: Automatically control the first electronic expansion valve according to the inlet pressure and the preset target inlet pressure, so that the opening of the first electronic expansion valve automatically changes with the change of the inlet pressure according to a first preset corresponding relationship, and the difference between the inlet pressure and the suction pressure is within a preset difference range.

[0066] In this embodiment, the preset target valve front pressure refers to a pre-set fixed valve front pressure or the safety pressure for actual use marked on the first electronic expansion valve when it leaves the factory. For example, the preset target valve front pressure can be set to any value between 12-15 bar (calibration quantity 8), and the calibration quantity 8 refers to the marked pressure of 8 bar.

[0067] Automatic control refers to the process of automatically changing the opening of the first electronic expansion valve through a pre-set automatic control algorithm or program. The first pre-set relationship may be corresponding data that affects the opening during the automatic control of the first electronic expansion valve. When the corresponding data changes, the opening of the first electronic expansion valve also changes accordingly to meet vehicle heating requirements when the ambient temperature is below the external temperature threshold. In this embodiment, the difference between the upstream pressure and the intake pressure being within the pre-set difference range means that, after automatically controlling the openings of the first and second electronic expansion valves, the enthalpy of the saturated gaseous refrigerant flowing back to the heat pump, as described in the above embodiment, is maintained at an appropriate value, such as the enthalpy of the refrigerant at the beginning of the heat pump's air heating.

[0068] Specifically, in an optional embodiment of the present application, step S403 includes: automatically controlling the first electronic expansion valve according to the automatic control algorithm PID based on the in-valve pressure and the preset target in-valve pressure, so that the first electronic expansion valve automatically changes with the change of the in-valve pressure according to the corresponding relationship that the opening is inversely proportional to the in-valve pressure, and the difference between the in-valve pressure and the suction pressure is within the preset difference range. Automatically controlling the first electronic expansion valve according to the automatic control algorithm PID based on the in-valve pressure and the preset target in-valve pressure, so that the first electronic expansion valve automatically changes with the change of the in-valve pressure according to the corresponding relationship that the opening is inversely proportional to the in-valve pressure, and the difference between the in-valve pressure and the suction pressure is within the preset difference range.

[0069] In this embodiment, the inversely proportional relationship between the opening degree of the first electronic expansion valve and the upstream pressure means that, during automatic control of the first electronic expansion valve using the automatic control algorithm PID, as the opening degree of the first electronic expansion valve increases, the upstream pressure decreases, and vice versa. Furthermore, during automatic control, the upstream pressure cannot exceed a preset target upstream pressure. This preset target upstream pressure can be the maximum value within a range of upstream pressures for safe operation of the first electronic expansion valve, for example, 12 bar.

[0070] S404: If it is detected that the second initial opening is less than the preset opening limit, the second electronic expansion valve is automatically controlled according to the suction pressure and the preset target suction pressure, so that the opening of the second electronic expansion valve automatically changes with the change of the suction pressure according to a second preset corresponding relationship.

[0071] In this embodiment, when it is detected that the second initial opening is less than the preset opening limit, it indicates that automatic control of the second electronic expansion valve can be initiated. The preset opening limit can be a pre-set opening value, for example, the preset opening limit can be 90%. When the second initial opening is less than 90%, automatic control can be initiated. The preset target intake pressure refers to a preset intake pressure value of the second electronic expansion valve, which can be a factory-calibrated maximum value. In this embodiment, the second preset correspondence can be a correspondence between the intake pressure and the opening of the second expansion valve.

[0072] Specifically, in an optional embodiment of the present application, step S404 includes:

[0073] S404a: Determine an inhalation pressure difference based on the inhalation pressure and a preset target inhalation pressure.

[0074] S404b: Automatically control the second electronic expansion valve according to the suction pressure difference using a stepwise approximation automatic control algorithm, so that the opening of the second electronic expansion valve automatically changes with changes in the suction pressure in a proportional relationship between the opening and the suction pressure.

[0075] In this embodiment, the successive approximation automatic control algorithm may be a process that adjusts the intake pressure by controlling the opening of the second expansion valve so that the actual intake pressure gradually approaches a preset target intake pressure, i.e., controls the intake pressure difference to gradually approach zero. In this embodiment, the successive approximation method may be pre-installed in the control instructions using an algorithm program.

[0076] In this embodiment, the proportional relationship between the opening and the suction pressure means that when the opening of the second expansion valve increases, the corresponding suction pressure will increase, and when the opening of the second expansion valve decreases, the corresponding suction pressure will also decrease.

[0077] FIG5 is a pressure-enthalpy diagram of an operation process of controlling a vehicle heating system when the ambient temperature is less than an external temperature threshold, provided by an embodiment of the present application.

[0078] As shown in Figure 5, after the heat pump is started, it heats the refrigerant into a high-temperature, high-pressure gaseous refrigerant. Both the pressure and enthalpy of the refrigerant increase, moving it from point A to point B. A portion of the refrigerant then passes through the internal heat exchanger, exchanging heat with the passenger compartment, reducing its enthalpy while maintaining its pressure. It then becomes liquid refrigerant at point C. The refrigerant then passes through the throttling of the first electronic expansion valve, maintaining its enthalpy while reducing its pressure. By the time it reaches point D, it becomes a low-temperature, low-pressure, two-phase refrigerant, where gas and liquid coexist. The remaining portion of the high-temperature, high-pressure gaseous refrigerant passes through the throttling of the second electronic expansion valve, reducing its pressure while maintaining its enthalpy, transforming it into a low-pressure, high-temperature gaseous refrigerant. The low-pressure, high-temperature refrigerant then mixes with the low-temperature, low-pressure refrigerant, remixing at point A to form a saturated gaseous refrigerant before returning to the heat pump.

[0079] As can be seen from Figure 5, during the coordinated working process of the heat pump, the first electronic expansion valve and the second electronic expansion valve, while improving energy efficiency, the passenger compartment can be heated using only the heat pump as a heating source when the ambient temperature is lower than the external temperature threshold. Specifically, it is only necessary to simultaneously coordinate the opening of the first electronic expansion valve and the second electronic expansion valve to control the ratio of the low-pressure and high-temperature gaseous refrigerant to the low-pressure and low-temperature two-phase refrigerant. The difference between the valve pre-pressure and the suction pressure in step S403 is within the preset difference range.

[0080] In summary, the vehicle heating system control method provided in the embodiments of the present application controls a vehicle heating system having only a heat pump as a heating source. When the vehicle's ambient temperature is detected to be less than an external temperature threshold, the heat pump, internal heat exchanger, external heat exchanger, and electromagnetic switch are activated. The first electronic expansion valve is activated at a first initial opening, and the second electronic expansion valve is activated at a second initial opening. The first electronic expansion valve is then automatically controlled based on the inlet pressure and a preset target inlet pressure, such that the opening of the first electronic expansion valve automatically changes with changes in the inlet pressure according to a first preset correspondence. If the second initial opening is detected to be less than a preset opening limit, the second electronic expansion valve is automatically controlled based on the intake pressure and a preset target intake pressure, such that the opening of the second electronic expansion valve automatically changes with changes in the intake pressure according to a second preset correspondence. During the entire control process, the refrigerant is heated by the heat pump and divided into two output paths. One path, high-temperature, high-pressure refrigerant, passes through an internal heat exchanger to heat the passenger compartment. After being throttled by the first electronic expansion valve, it becomes a low-temperature, low-pressure two-phase refrigerant, which then returns to the heat pump input through an external heat exchanger. The other path directly passes through the throttling of the second electronic expansion throttle valve, becoming a low-pressure, high-temperature gaseous refrigerant while maintaining its enthalpy. It then mixes with the low-temperature, low-pressure two-phase refrigerant to form a saturated gaseous refrigerant, allowing the refrigerant's enthalpy value to return to the compressor at the node with the highest energy efficiency, thus achieving heating under ultra-low temperature conditions. Therefore, a vehicle heating system with only a heat pump as a heating source and appropriate control can be installed on the vehicle to meet low-temperature usage requirements, reducing the number of components in the vehicle heating system, lowering vehicle costs, and reducing overall vehicle weight.

[0081] At the same time, in the embodiment of the present application, the front cabin layout space of the vehicle is saved by reducing the original electric heater and other devices.

[0082] Based on the above embodiment, in an optional embodiment of the present application, the control method of the vehicle heating system further includes:

[0083] Step A: Acquire the intake temperature of the first electronic expansion valve in real time.

[0084] Step B: If it is detected that the suction temperature is greater than the temperature limit, the preset target valve upstream pressure is corrected according to the corresponding relationship that the target valve upstream pressure is inversely proportional to the suction temperature to obtain an updated target valve upstream pressure, and the process jumps to the step of automatically controlling the first electronic expansion valve based on the valve upstream pressure and the preset target valve upstream pressure.

[0085] In this embodiment, the intake temperature refers to the temperature of the gaseous refrigerant at the input of the first electronic expansion valve. The temperature limit is a pre-set value, for example, 20°C. When the intake temperature is greater than 20°C, the target upstream pressure can be corrected. When correcting the target upstream pressure, the corresponding relationship between upstream pressure and intake temperature can be referenced. Higher intake temperatures result in lower target upstream pressure.

[0086] In summary, the control method of the vehicle heating system provided in the embodiment of the present application further makes the target pre-valve pressure referenced during the automatic control process more accurate by correcting the target pre-valve pressure in real time according to the intake temperature, thereby improving the heating effect.

[0087] In an optional embodiment of the present application, the passenger cabin data includes the air outlet temperature of the heating, communication, and air conditioning condition system. Accordingly, after step S401, the following steps are further included:

[0088] Step C: Obtain the system operating time of the vehicle heating system.

[0089] Step D: If it is detected that the second initial opening is greater than or equal to the preset opening limit, the temperature difference is determined according to the air outlet temperature of the heating communication and air conditioning condition system and the preset target temperature.

[0090] Step E: If it is detected that the temperature difference is greater than the preset temperature difference threshold, or the system operation time reaches the preset time threshold, the process jumps to the step of automatically controlling the second electronic expansion valve according to the intake pressure and the preset target intake pressure, so that the opening of the second electronic expansion valve automatically changes with changes in passenger compartment data or ambient temperature according to a second preset corresponding relationship.

[0091] In this embodiment, the system operating time may be the start-up operating time of the heat pump. If the second initial opening is greater than or equal to the preset opening limit, it indicates that the automatic control condition for the second electronic expansion valve has not been met. Therefore, further determination is required for the condition for entering the automatic control mode.

[0092] In this embodiment, the preset temperature difference threshold may be a pre-set temperature difference limit. For example, the preset temperature difference threshold may be -5K, which means that the HVAC (Heating, Ventilation and Air Conditioning) outlet air temperature is 5 Kelvin temperature units (also expressed as -5°C) lower than the expected temperature. At this point, it indicates that automatic control of the second electronic expansion valve can begin. Alternatively, when the system operating time reaches a preset time threshold, indicating that the internal heat exchanger has been heating the passenger compartment for a period of time, the second electronic expansion valve can also be automatically controlled to adjust the enthalpy of the refrigerant returned to the heat pump input end, thereby jumping to step S404.

[0093] The above embodiment describes the control method of the entire vehicle heating system when the ambient temperature is less than the external temperature threshold. The following describes the control process of the vehicle heating system when the ambient temperature is greater than or equal to the external temperature threshold.

[0094] Based on the above embodiment, in an optional embodiment of the present application, the control method of the vehicle heating system further includes: if it is detected that the ambient temperature is greater than or equal to the external temperature threshold, controlling the second electronic expansion valve and the electromagnetic switch to close.

[0095] In this embodiment, when the ambient temperature is greater than or equal to the external temperature threshold, it indicates that the refrigerant in the vehicle heating system can absorb heat from the environment when passing through the external heat exchanger and return to the heat pump. In this case, the heat pump system control method shown in Figure 1 is sufficient, and this embodiment will not be further described here. It should be noted that the second electronic expansion valve and the solenoid switch can be controlled to close, so that the refrigerant from the heat pump only circulates one way.

[0096] In summary, the control method of the vehicle heating system provided in this embodiment also achieves the purpose of reducing energy consumption and improving energy efficiency by heating the passenger compartment by only using a cycle of the heat pump, the internal heat exchanger, the first electronic expansion valve and the external heat exchanger when the ambient temperature is greater than or equal to the external temperature threshold and can absorb heat from the environment to heat the passenger compartment, thereby achieving the purpose of reducing energy consumption and improving energy efficiency.

[0097] Based on the above embodiment, in an optional embodiment of the present application, the control method of the vehicle heating system further includes:

[0098] Step F: Obtain the temperature of the heat pump control circuit board PCBA in real time.

[0099] Step G: If it is detected that the PCBA temperature exceeds a preset calibration value, the opening of the first electronic expansion valve and the opening of the second electronic expansion valve are controlled to remain unchanged.

[0100] In this embodiment, the PCBA temperature refers to the temperature of the control circuit board within the heat pump. When the PCBA temperature exceeds a preset calibration value, it indicates that the PCBA temperature has reached its maximum safe operating temperature. For example, the preset calibration value may be 30°C. If the temperature exceeds 30°C, the heat pump may malfunction or even be directly damaged. In this case, the openings of the first and second electronic expansion valves may be limited to continue increasing, that is, the first and second electronic expansion valves may be controlled to maintain their current openings.

[0101] In an optional embodiment of the present application, if it is detected that the PCBA temperature is below a preset calibration value, the first electronic expansion valve and the second electronic expansion valve are automatically controlled to ensure the normal operation of the entire vehicle heating system.

[0102] Based on the above embodiment, in an optional embodiment of the present application, in addition to controlling the opening of the first electronic expansion valve and the second electronic expansion valve to remain unchanged, if it is detected that the PCBA temperature exceeds a preset calibration value, it also includes: controlling the opening of the first electronic expansion valve and / or the second electronic expansion valve to decrease.

[0103] In this embodiment, the temperature of the PCBA can be lowered by controlling the opening of at least one of the first electronic expansion valve and the second electronic expansion valve to decrease.

[0104] In summary, the control method of the vehicle heating system provided in this embodiment also adjusts the working status of the first electronic expansion valve and the second electronic expansion valve in time by real-time detection of the PCBA temperature, thereby avoiding damage to the heat pump and improving the operational safety of the vehicle heating system.

[0105] FIG6 is a schematic structural diagram of a control device for a vehicle heating system provided in an embodiment of the present application. The device includes an acquisition module 61 , a start module 62 , and a control module 63 .

[0106] The acquisition module 61 is used to acquire the ambient temperature, passenger compartment data, the pressure before the first electronic expansion valve, and the suction pressure of the second electronic expansion valve in real time.

[0107] The starting module 62 is used to start the heat pump, the internal heat exchanger, the external heat exchanger and the electromagnetic switch if it is detected that the ambient temperature is less than the external temperature threshold, and to start the first electronic expansion valve at a first initial opening degree, and to start the second electronic expansion valve at a second initial opening degree, wherein the first initial opening degree is determined according to the ambient temperature, and the second initial opening degree is determined according to the passenger compartment data and the ambient temperature.

[0108] The control module 63 is used to automatically control the first electronic expansion valve according to the valve front pressure and the preset target valve front pressure, so that the opening of the first electronic expansion valve automatically changes with the change of the valve front pressure according to a first preset corresponding relationship, and the difference between the valve front pressure and the suction pressure is within a preset difference range.

[0109] The control module 63 is further configured to automatically control the second electronic expansion valve according to the suction pressure and the preset target suction pressure if it is detected that the second initial opening is less than the preset opening limit, so that the opening of the second electronic expansion valve automatically changes with the change of the suction pressure according to the second preset corresponding relationship.

[0110] In an optional embodiment of the present application, the passenger compartment data includes the passenger compartment thermal load; accordingly, the starting module 62 is specifically used to determine the second initial opening based on the passenger compartment data and the ambient temperature, including: the second initial opening is determined based on the passenger compartment thermal load data and the ambient temperature.

[0111] In an optional embodiment of the present application, the control module 63 is specifically used to automatically control the first electronic expansion valve according to the automatic control algorithm PID based on the pre-valve pressure and the preset target pre-valve pressure, so that the first electronic expansion valve automatically changes with the change of the pre-valve pressure according to the corresponding relationship in which the opening is inversely proportional to the pre-valve pressure, and the difference between the pre-valve pressure and the suction pressure is within the preset difference range.

[0112] In an optional embodiment of the present application, the control module 63 is further specifically used to: determine the intake pressure difference based on the intake pressure and the preset target intake pressure; automatically control the second electronic expansion valve according to the intake pressure difference according to the step-by-step approximation automatic control algorithm, so that the opening of the second electronic expansion valve automatically changes with the change of passenger compartment data or ambient temperature according to the corresponding relationship in which the opening is proportional to the intake pressure.

[0113] In an optional embodiment of the present application, the acquisition module 61 is further configured to obtain the intake temperature of the first electronic expansion valve in real time. The control module 63 is further configured to, if the intake temperature is detected to be greater than a temperature limit, correct the preset target upstream pressure according to the inversely proportional relationship between the target upstream pressure and the intake temperature to obtain an updated target upstream pressure, and then jump to the step of automatically controlling the first electronic expansion valve based on the upstream pressure and the preset target upstream pressure.

[0114] In an optional embodiment of the present application, the passenger compartment data includes the outlet air temperature of the heating, communication, and air conditioning system. Accordingly, the acquisition module 61 is further configured to: obtain the system operating time of the vehicle heating system; if the second initial opening is detected to be greater than or equal to a preset opening limit, determine a temperature difference based on the outlet air temperature of the heating, communication, and air conditioning system and a preset target temperature. The control module 63 is further configured to: if the temperature difference is detected to be greater than a preset temperature difference threshold, or if the system operating time reaches a preset duration threshold, jump to the step of automatically controlling the second electronic expansion valve based on the intake pressure and the preset target intake pressure, so that the opening of the second electronic expansion valve automatically changes according to a second preset correspondence with changes in the passenger compartment data or ambient temperature.

[0115] In an optional embodiment of the present application, the control module 63 is further configured to: if it is detected that the ambient temperature is greater than or equal to the external temperature threshold, control the second electronic expansion valve and the electromagnetic switch to close.

[0116] In an optional embodiment of the present application, the acquisition module 61 is further used to: obtain the temperature of the control circuit board PCBA of the heat pump in real time; the control module 63 is further used to: if it is detected that the PCBA temperature exceeds a preset calibration value, control the opening of the first electronic expansion valve and the opening of the second electronic expansion valve to remain unchanged.

[0117] The control device for the vehicle heating system provided in this embodiment can be used to implement the technical solution of the above-mentioned method embodiment. Its implementation principle and technical effects are similar and will not be described in detail in this embodiment.

[0118] FIG7 is a schematic diagram of the hardware structure of a control device for a vehicle heating system provided in an embodiment of the present application. As shown in FIG7 , the device includes: at least one processor 701 and a memory 702 .

[0119] The memory 702 is used to store computer-executable instructions.

[0120] The processor 701 is configured to execute the computer-executable instructions stored in the memory 702 to implement the various steps involved in the above method embodiment. For details, please refer to the relevant description in the above method embodiment.

[0121] Optionally, the memory 702 may be independent or integrated with the processor 701 .

[0122] When the memory 702 is independently provided, the device further includes a bus 703 for connecting the memory 702 and the processor 701 .

[0123] An embodiment of the present application further provides a computer-readable storage medium, in which computer-executable instructions are stored. When a processor executes the computer-executable instructions, the above-mentioned vehicle heating system control method is implemented.

[0124] An embodiment of the present application further provides a vehicle, which includes: a vehicle body, and a control device of the vehicle heating system as described in the embodiment shown in FIG. 7 , which is arranged in the vehicle body.

[0125] An embodiment of the present application further provides a computer program product, including a computer program, which implements the above-mentioned vehicle heating system control method when executed by a processor.

[0126] In the several embodiments provided in this application, it is understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the modules described above is merely a logical function division. In actual implementation, there may be other division methods, such as multiple modules can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or modules, which can be electrical, mechanical or other forms.

[0127] The modules described above as separate components may or may not be physically separate, and the components shown as modules may or may not be physical units, that is, they may be located in one place or distributed across multiple network elements. Some or all of these modules may be selected to implement the solution of this embodiment based on actual requirements.

[0128] In addition, the functional modules in various embodiments of the present invention may be integrated into a single processing unit, each module may exist physically separately, or two or more modules may be integrated into a single unit. The units composed of the above modules may be implemented in the form of hardware or hardware plus software functional units.

[0129] The above-mentioned integrated module implemented in the form of a software function module can be stored in a computer-readable storage medium. The above-mentioned software function module is stored in a storage medium and includes a number of instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) or a processor to perform some steps of the method of each embodiment of the present application.

[0130] It should be understood that the processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), or application-specific integrated circuits (ASICs). A general-purpose processor may be a microprocessor or any conventional processor. The steps of the method disclosed in the present invention may be directly implemented by a hardware processor or implemented by a combination of hardware and software modules in the processor.

[0131] The memory may include a high-speed RAM memory, and may also include non-volatile storage NVM, such as at least one disk memory, and may also be a USB flash drive, a mobile hard disk, a read-only memory, a magnetic disk or an optical disk.

[0132] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus. Buses can be categorized as address buses, data buses, and control buses. For ease of illustration, the buses in the drawings of this application are not limited to just one bus or just one type of bus.

[0133] The storage medium may be implemented by any type of volatile or non-volatile memory device, or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. The storage medium may be any available medium that can be accessed by a general-purpose or special-purpose computer.

[0134] An exemplary storage medium is coupled to a processor so that the processor can read information from the storage medium and write information to the storage medium. Of course, the storage medium can also be an integral part of the processor. The processor and the storage medium can be located in an application specific integrated circuit (ASIC). Of course, the processor and the storage medium can also exist as discrete components in an electronic device or a main control device.

[0135] Those skilled in the art will appreciate that all or part of the steps in the above-described method embodiments can be implemented using hardware associated with program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments. The aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0136] The present invention is intended to illustrate the technical solution of the present application rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solution from the scope of the technical solution of the embodiments of the present application.

Claims

1. A control method for a vehicle heating system, wherein, The vehicle heating system includes: a heat pump, an internal heat exchanger, a first electronic expansion valve, an external heat exchanger, an electromagnetic switch, and a second electronic expansion valve; wherein the output end of the heat pump is communicated with the input end of the internal heat exchanger, the output end of the internal heat exchanger is communicated with the input end of the first electronic expansion valve, the output end of the first electronic expansion valve is communicated with the input end of the external heat exchanger, the output ends of both the external heat exchanger and the second electronic expansion valve are communicated with the input end of the heat pump, the external heat exchanger is electrically connected to the electromagnetic switch, and the input end of the second electronic expansion valve is communicated with the output end of the heat pump; The control method of the vehicle heating system is applied to a vehicle controller and includes: Obtaining the ambient temperature, the occupant compartment data, the pressure before the first electronic expansion valve, and the suction pressure of the second electronic expansion valve in real time; If it is detected that the ambient temperature is lower than the external temperature threshold, start the heat pump, the internal heat exchanger, the external heat exchanger, and the electromagnetic switch, and start the first electronic expansion valve at a first initial opening degree and start the second electronic expansion valve at a second initial opening degree, wherein the first initial opening degree is determined according to the ambient temperature, and the second initial opening degree is determined according to the occupant compartment data and the ambient temperature; Automatically control the first electronic expansion valve according to the pressure before the valve and a preset target pressure before the valve, so that the opening degree of the first electronic expansion valve automatically changes with the change of the pressure before the valve according to a first preset corresponding relationship, and the difference between the pressure before the valve and the suction pressure is within a preset difference range; If it is detected that the second initial opening degree is less than a preset opening degree limit value, automatically control the second electronic expansion valve according to the suction pressure and a preset target suction pressure, so that the opening degree of the second electronic expansion valve automatically changes with the change of the suction pressure according to a second preset corresponding relationship.

2. The method according to claim 1, wherein the occupant compartment data includes the occupant compartment heat load; Correspondingly, the second initial opening degree is determined according to the occupant compartment data and the ambient temperature, including: The second initial opening degree is determined according to the occupant compartment heat load data and the ambient temperature.

3. The method according to any one of claims 1 or 2, wherein The automatically controlling the first electronic expansion valve according to the pressure before the valve and a preset target pressure before the valve, so that the opening degree of the first electronic expansion valve automatically changes with the change of the pressure before the valve according to a first preset corresponding relationship, includes: Automatically control the first electronic expansion valve according to the pressure before the valve and the preset target pressure before the valve according to the automatic control algorithm PID, so that the opening degree of the first electronic expansion valve automatically changes with the change of the pressure before the valve according to a corresponding relationship in which the opening degree is inversely proportional to the pressure before the valve, and the difference between the pressure before the valve and the suction pressure is within a preset difference range.

4. The method according to any one of claims 1 to 3, wherein, The automatically controlling the second electronic expansion valve according to the difference between the suction pressure and a preset pressure target difference, so that the opening degree of the second electronic expansion valve automatically changes with the change of the suction pressure according to a second preset corresponding relationship, includes: Determine the suction pressure difference according to the suction pressure and the preset target suction pressure; Automatically control the second electronic expansion valve according to the step-by-step approximation automatic control algorithm based on the difference in the suction pressure, so that the opening degree of the second electronic expansion valve changes automatically with the change of the occupant compartment data or the ambient temperature according to the corresponding relationship in which the opening degree is proportional to the suction pressure.

5. The method according to any one of claims 1 to 4 further includes: Obtain the suction temperature of the first electronic expansion valve in real time; If it is detected that the suction temperature is greater than the temperature limit value, then correct the preset target valve front pressure according to the corresponding relationship in which the target valve front pressure is inversely proportional to the suction temperature to obtain an updated target valve front pressure, and jump to the step of automatically controlling the first electronic expansion valve according to the valve front pressure and the preset target valve front pressure.

6. The method according to any one of claims 1 to 5, wherein The occupant compartment data includes the outlet air temperature of the heating communication and air conditioning condition system; Correspondingly, after obtaining the ambient temperature, the occupant compartment data, the valve front pressure of the first electronic expansion valve, and the suction pressure of the second electronic expansion valve in real time, it further includes: Obtain the system operation time of the vehicle heating system; If it is detected that the second initial opening degree is greater than or equal to the preset opening degree limit value, then determine the temperature difference according to the outlet air temperature of the heating communication and air conditioning condition system and the preset target temperature; If it is detected that the temperature difference is greater than the preset temperature difference threshold, or the system operation time reaches the preset duration threshold, then jump to the step of automatically controlling the second electronic expansion valve according to the suction pressure and the preset target suction pressure, so that the opening degree of the second electronic expansion valve changes automatically with the change of the occupant compartment data or the ambient temperature according to the second preset corresponding relationship.

7. The method according to any one of claims 1 to 6 further includes: If it is detected that the ambient temperature is greater than or equal to the external temperature threshold, then control the second electronic expansion valve and the electromagnetic switch to close.

8. The method according to any one of claims 1 to 7 further includes: Obtain the temperature of the control circuit board PCBA of the heat pump in real time; If it is detected that the PCBA temperature exceeds the preset calibrated quantity, then control the opening degrees of the first electronic expansion valve and the second electronic expansion valve to remain unchanged.

9. The method according to claim 8, characterized in that After obtaining the temperature of the control circuit board PCBA of the heat pump in real time, it further includes: If it is detected that the PCBA temperature is below the preset calibrated quantity, then continue to automatically control the first electronic expansion valve and the second electronic expansion valve to enable the normal operation of the entire vehicle heating system.

10. The method according to claim 8, wherein After the step of if it is detected that the PCBA temperature exceeds the preset calibrated quantity, it further includes: Control the opening degrees of the first electronic expansion valve and the second electronic expansion valve to decrease; Or control the opening degree of the first electronic expansion valve to decrease and the opening degree of the second electronic expansion valve to remain unchanged; Or control the opening degree of the first electronic expansion valve to remain unchanged and the opening degree of the second electronic expansion valve to decrease.

11. A control device for a vehicle heating system, wherein the vehicle heating system comprises: A heat pump, an internal heat exchanger, a first electronic expansion valve, an external heat exchanger, an electromagnetic switch, and a second electronic expansion valve; wherein the output end of the heat pump is communicated with the input end of the internal heat exchanger, the output end of the internal heat exchanger is communicated with the input end of the first electronic expansion valve, the output end of the first electronic expansion valve is communicated with the input end of the external heat exchanger, the output ends of both the external heat exchanger and the second electronic expansion valve are communicated with the input end of the heat pump, the external heat exchanger is electrically connected to the electromagnetic switch, and the input end of the second electronic expansion valve is communicated with the output end of the heat pump; The device is applied to a vehicle controller and includes: An acquisition module for real-time acquisition of the ambient temperature, occupant compartment data, the pre-valve pressure of the first electronic expansion valve, and the suction pressure of the second electronic expansion valve; A start module for starting the heat pump, the internal heat exchanger, the external heat exchanger, and the electromagnetic switch if it is detected that the ambient temperature is lower than an external temperature threshold, starting the first electronic expansion valve at a first initial opening degree, and starting the second electronic expansion valve at a second initial opening degree, wherein the first initial opening degree is determined according to the ambient temperature, and the second initial opening degree is determined according to the occupant compartment data and the ambient temperature; A control module for automatically controlling the first electronic expansion valve according to the pre-valve pressure and a preset target pre-valve pressure, such that the opening degree of the first electronic expansion valve automatically changes with the change of the pre-valve pressure according to a first preset corresponding relationship, and the difference between the pre-valve pressure and the suction pressure is within a preset difference range; The control module is further configured to, if it is detected that the second initial opening degree is less than a preset opening degree limit value, automatically control the second electronic expansion valve according to the suction pressure and a preset target suction pressure, such that the opening degree of the second electronic expansion valve automatically changes with the change of the suction pressure according to a second preset corresponding relationship.

12. A control device for a vehicle heating system, comprising: At least one processor and a memory; The memory stores computer-executable instructions; The at least one processor executes the computer-executable instructions stored in the memory, such that the at least one processor executes the control method of the vehicle heating system according to any one of claims 1 to 10.

13. A vehicle, comprising: A vehicle body, and a control device of the vehicle heating system according to claim 12 provided in the vehicle body.

14. A computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the control method of the vehicle heating system according to any one of claims 1 to 10.

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