Temperature adjusting method and device based on vehicle-mounted heat pump air conditioning system and storage medium

Abstract

The invention provides a temperature adjusting method and device based on a vehicle-mounted heat pump air conditioning system and a storage medium. The method comprises the steps that under the condition that the vehicle-mounted heat pump air conditioning system is in a passenger compartment dehumidification mode, the rotating speed of a compressor in the vehicle-mounted heat pump air conditioning system is adjusted according to the temperature difference between the target water outlet temperature and the actual water outlet temperature of a PTC heating unit so as to control the temperature difference to reach the target temperature difference; according to the temperature difference and the intervention state of the PTC heating unit, the opening degree of a three-way proportional valve of the passenger compartment is adjusted, and the intervention state includes that the PTC heating unit intervenes auxiliary heating on the passenger compartment and does not intervene auxiliary heating on the passenger compartment; and according to the temperature difference, determining a proportionality coefficient used for carrying out proportional-integral (PI) control on the PTC heating unit, and adjusting the output of the PTC heating unit by utilizing the proportionality coefficient so as to control the opening or closing of the PTC heating unit, so that the water temperature is adjusted. The electric energy consumption can be reduced, the energy-saving effect of the heat pump air conditioning system is improved, and therefore the cruising ability of the vehicle is improved.

Description

Technical Field

[0001] The present application relates to the field of new energy vehicle technology, and in particular to a temperature regulation method, device and storage medium based on a vehicle-mounted heat pump air-conditioning system. Background Art

[0002] Heat pump air conditioning system is a technology that is more energy-efficient than traditional positive temperature coefficient (PTC) heating and is widely used in vehicle air conditioning systems. Compared with traditional PTC heating, heat pump air conditioning system can maximize thermal efficiency under the same power consumption, thereby reducing energy consumption and helping to maintain the vehicle's endurance, which is particularly important for electric vehicles.

[0003] However, in actual applications, the opening of the three-way valve in the passenger compartment directly affects the heating effect of the passenger compartment. When the opening of the three-way valve is not properly controlled, the temperature in the passenger compartment may not reach the expected level, causing the system to start the PTC heating unit for auxiliary heating. Although PTC heating can increase the temperature of the passenger compartment in a short period of time, its frequent and unnecessary intervention will significantly increase power consumption, weakening the energy-saving advantage of the heat pump air conditioning system.

[0004] Therefore, in the existing technology, how to effectively match the opening of the passenger compartment three-way valve with the intervention of the PTC heating unit and optimize the overall control strategy of the heat pump air conditioning system has become a technical problem that needs to be solved urgently. The existing control method still has deficiencies in matching these two key components, resulting in the failure to fully utilize the system energy efficiency, affecting the vehicle's endurance and user experience. Summary of the invention

[0005] In view of this, the embodiments of the present application provide a temperature control method, device and storage medium based on a vehicle-mounted heat pump air-conditioning system to solve the problems existing in the prior art of increased power consumption, reduced energy-saving effect of the heat pump air-conditioning system, and reduced vehicle endurance.

[0006] In a first aspect of an embodiment of the present application, a temperature regulation method based on a vehicle-mounted heat pump air-conditioning system is provided, wherein a circuit of the vehicle-mounted heat pump air-conditioning system includes a passenger compartment positive temperature coefficient thermistor (PTC) heating unit and a passenger compartment three-way proportional valve, comprising: when the vehicle-mounted heat pump air-conditioning system is in a passenger compartment dehumidification mode, according to the temperature difference between a target water outlet temperature and an actual water outlet temperature of the PTC heating unit, adjusting the speed of a compressor in the vehicle-mounted heat pump air-conditioning system to control the temperature difference to reach a target temperature difference; according to the temperature difference and the intervention state of the PTC heating unit, adjusting the opening of the passenger compartment three-way proportional valve to regulate the water temperature, the intervention state including when the PTC heating unit intervenes in auxiliary heating of the passenger compartment and when it does not intervene in auxiliary heating of the passenger compartment; determining a proportional coefficient for proportional-integral (PI) control of the PTC heating unit according to the temperature difference, and using the proportional coefficient to regulate the output of the PTC heating unit to control the opening or closing of the PTC heating unit so as to regulate the water temperature.

[0007] According to a second aspect of an embodiment of the present application, a temperature control device based on a vehicle-mounted heat pump air-conditioning system is provided, comprising: an adjustment module, which, when the vehicle-mounted heat pump air-conditioning system is in a passenger compartment dehumidification mode, adjusts the speed of a compressor in the vehicle-mounted heat pump air-conditioning system according to the temperature difference between a target water outlet temperature and an actual water outlet temperature of a PTC heating unit, so as to control the temperature difference to reach a target temperature difference; a first adjustment module, which adjusts the opening of a three-way proportional valve in the passenger compartment according to the temperature difference and the intervention state of the PTC heating unit, so as to adjust the water temperature, the intervention state including when the PTC heating unit intervenes in auxiliary heating of the passenger compartment and when it does not intervene in auxiliary heating of the passenger compartment; a second adjustment module, which determines a proportional coefficient for proportional-integral (PI) control of the PTC heating unit according to the temperature difference, and uses the proportional coefficient to adjust the output of the PTC heating unit to control the opening or closing of the PTC heating unit, so as to adjust the water temperature.

[0008] According to a third aspect of an embodiment of the present application, an electronic device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the steps of the above method are implemented when the processor executes the computer program.

[0009] According to a fourth aspect of an embodiment of the present application, a readable storage medium is provided, which stores a computer program, and when the computer program is executed by a processor, the steps of the above method are implemented.

[0010] At least one of the above technical solutions adopted in the embodiments of the present application can achieve the following beneficial effects:

[0011] When the vehicle-mounted heat pump air-conditioning system is in the passenger compartment dehumidification mode, the speed of the compressor in the vehicle-mounted heat pump air-conditioning system is adjusted according to the temperature difference between the target water outlet temperature and the actual water outlet temperature of the PTC heating unit to control the temperature difference to reach the target temperature difference; according to the temperature difference and the intervention state of the PTC heating unit, the opening of the three-way proportional valve in the passenger compartment is adjusted to adjust the water temperature, and the intervention state includes the PTC heating unit intervening in auxiliary heating of the passenger compartment and not intervening in auxiliary heating of the passenger compartment; according to the temperature difference, the proportional coefficient used for proportional integral PI control of the PTC heating unit is determined, and the output of the PTC heating unit is adjusted using the proportional coefficient to control the opening or closing of the PTC heating unit so as to adjust the water temperature. The present application can reduce power consumption, improve the energy-saving effect of the heat pump air-conditioning system, and thus improve the vehicle's endurance. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0013] Figure 1 It is a flow chart of a temperature adjustment method based on a vehicle-mounted heat pump air conditioning system provided in an embodiment of the present application;

[0014] Figure 2 It is a structural schematic diagram of a temperature regulating device based on a vehicle-mounted heat pump air conditioning system provided in an embodiment of the present application;

[0015] Figure 3 It is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0016] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0017] Heat pump air conditioning system is a relatively energy-saving vehicle air conditioning solution, especially widely used in electric vehicles. Compared with the traditional PTC (positive temperature coefficient thermistor) heating method, heat pump air conditioning can provide higher thermal efficiency under the same power consumption, which helps to reduce the energy consumption of the vehicle and thus extend the vehicle's range. This is particularly important for electric vehicles because it directly affects the practicality and user experience of electric vehicles.

[0018] In existing heat pump air conditioning systems, the heating effect of the passenger compartment is affected by multiple factors, among which the opening of the passenger compartment three-way valve is a key factor. The function of the three-way valve is to adjust the flow direction of the refrigerant or heating medium to ensure that the best air conditioning effect can be achieved under different working conditions (such as cooling or heating). However, in actual applications, when the opening of the passenger compartment three-way valve is not effectively controlled or adjusted improperly, the heating effect of the passenger compartment may not be ideal.

[0019] In order to compensate for this undesirable heating effect, the system usually activates the PTC of the passenger compartment for auxiliary heating. Although this method can increase the temperature of the passenger compartment to a certain extent and meet the heat demand, the intervention of PTC means additional power consumption, which weakens the energy-saving advantage of the heat pump air conditioning system.

[0020] The main problem of the existing technology is that there is a lack of effective matching and coordination between the opening control of the three-way valve in the passenger compartment and the intervention of PTC. When the three-way valve is not adjusted properly, PTC may intervene excessively or unnecessarily, which will cause a significant decrease in the energy-saving effect of the heat pump air-conditioning system, thereby affecting the vehicle's endurance.

[0021] Therefore, how to optimize the control strategy of the three-way valve in the passenger compartment to match it with the intervention time and degree of PTC to maximize the energy-saving effect of the heat pump air-conditioning system has become a key issue that current technology needs to solve.

[0022] In view of the problems existing in the prior art, the present application provides a thermal management control strategy for a heat pump air-conditioning three-way valve and PTC. The present application mainly optimizes the control method of the passenger compartment three-way valve and PTC combined heating strategy in the dehumidification mode, which can effectively improve the passenger compartment's use of the energy-saving advantages of the heat pump air-conditioning while quickly meeting the passenger compartment's thermal needs.

[0023] The contents of the technical solution of the present application are described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Figure 1 : is a flow chart of a temperature adjustment method based on a vehicle heat pump air conditioning system provided in an embodiment of the present application. The circuit of the vehicle heat pump air conditioning system includes a passenger compartment positive temperature coefficient thermistor PTC heating unit and a passenger compartment three-way proportional valve, such as Figure 1As shown, the temperature adjustment method based on the vehicle-mounted heat pump air conditioning system may specifically include:

[0025] S101, when the vehicle heat pump air conditioning system is in a passenger compartment dehumidification mode, adjusting the speed of a compressor in the vehicle heat pump air conditioning system according to a temperature difference between a target water outlet temperature and an actual water outlet temperature of a PTC heating unit, so as to control the temperature difference to reach a target temperature difference;

[0026] S102, adjusting the opening of the three-way proportional valve in the passenger compartment to adjust the water temperature according to the temperature difference and the intervention state of the PTC heating unit, wherein the intervention state includes whether the PTC heating unit intervenes in auxiliary heating of the passenger compartment and whether the PTC heating unit does not intervene in auxiliary heating of the passenger compartment;

[0027] S103, determining a proportional coefficient for proportional-integral (PI) control of the PTC heating unit according to the temperature difference, and adjusting the output of the PTC heating unit using the proportional coefficient to control the on or off of the PTC heating unit so as to adjust the water temperature.

[0028] First, an embodiment of the present application describes a thermal management control method suitable for a vehicle-mounted heat pump air-conditioning system, particularly in the passenger compartment dehumidification mode, by coordinating and controlling the operation of the compressor, the passenger compartment three-way proportional valve and the PTC heating unit, to achieve precise adjustment of the passenger compartment temperature.

[0029] When the vehicle heat pump air conditioning system enters the passenger compartment dehumidification mode, the system's control target prioritizes the comfort of the passenger compartment. In this mode, the system monitors the temperature difference between the target and actual outlet water temperatures of the PTC heating unit, and adjusts the compressor speed according to the temperature difference to ensure that the temperature difference reaches the predetermined target value, thereby achieving effective control of the passenger compartment temperature.

[0030] Specifically, after the thermal management mode enters the passenger compartment dehumidification mode, the control target of the compressor is set to the target water temperature difference of the PTC heating unit. Through the PI control algorithm, the system calculates the difference between the actual PTC outlet water temperature and the PTC target outlet water temperature, and adjusts the compressor speed based on this difference. The proportional (Kp) and integral (Ki) coefficients in the PI control algorithm are set according to the actual working conditions to ensure that the system can respond quickly when the temperature difference is large and operate smoothly when the temperature difference is small.

[0031] For example, when the target outlet water temperature of the PTC heating unit is significantly higher than the actual outlet water temperature, the system increases the speed of the compressor to speed up the heating and reduce the target temperature difference. When the temperature difference gradually decreases and approaches the target value, the speed of the compressor is also reduced to avoid overheating or frequent fluctuations, ensuring temperature stability and comfort in the passenger compartment.

[0032] In addition, the opening of the three-way proportional valve in the passenger compartment will also be precisely controlled according to the operating status of the compressor and the temperature difference adjustment result of the PTC heating unit. According to the current temperature difference and the status of the PTC heating unit, the system dynamically adjusts the opening of the three-way proportional valve through a preset control strategy to further optimize the water temperature regulation effect. When rapid temperature increase is required, the three-way proportional valve will be closed appropriately to reduce the circulation of the cooling medium, thereby accelerating the increase in water temperature. Conversely, when a smooth cooling or temperature maintenance is required, the opening of the three-way proportional valve will be appropriately increased to achieve a smooth temperature adjustment.

[0033] In summary, by coordinating the control of the compressor, the passenger compartment three-way proportional valve and the PTC heating unit, the vehicle-mounted heat pump air-conditioning system in this embodiment can achieve precise control of the temperature in the passenger compartment dehumidification mode, ensuring the comfort of the passenger compartment while maximizing the energy-saving advantages of the heat pump system.

[0034] In some embodiments, the opening of the three-way proportional valve of the passenger compartment is adjusted according to the temperature difference and the intervention state of the PTC heating unit, including:

[0035] When the intervention state is that auxiliary heating is not provided to the passenger compartment, a first mapping relationship between a preset temperature difference and a proportional coefficient and an integral coefficient in the PI control is queried according to the temperature difference to obtain a first proportional coefficient and a first integral coefficient corresponding to the temperature difference;

[0036] The opening of the three-way proportional valve in the passenger compartment is adjusted by using the first proportional coefficient and the first integral coefficient, so as to quickly adjust the water temperature when the PTC heating unit is not involved in auxiliary heating.

[0037] Specifically, the embodiment of the present application also introduces how to achieve rapid adjustment of water temperature through a control strategy of a three-way proportional valve in the passenger compartment in a vehicle-mounted heat pump air-conditioning system when the PTC heating unit is not in operation, thereby optimizing the energy efficiency of the system.

[0038] When the PTC heating unit is not involved, the system will first control the water temperature by adjusting the opening of the three-way proportional valve in the passenger compartment. This control strategy relies on the pre-created proportional integral control (PI control) coefficient mapping relationship, that is, according to different temperature difference ranges, the corresponding proportional coefficient (Kp) and integral coefficient (Ki) are queried, and these coefficients are used to accurately adjust the opening of the three-way proportional valve. As shown in Table 1, this is a proportional integral control (PI control) coefficient mapping relationship table when the PTC heating unit is not involved, referred to as the PI control coefficient mapping relationship table.

[0039] Table 1 PI control coefficient mapping relationship table when PTC heating unit is not involved

[0040] Temperature difference -10 -5 -3 -2 -1 -0.5 0 Kp -3 -3 -3 -3 -3 -3 -1.5 Ki -0.2 -0.2 -0.2 -0.2 -0.2 -0.2 -0.1

[0041] Specifically, the three-way proportional valve in the passenger compartment directly affects the speed of change of the water temperature. Therefore, in order to quickly adjust the water temperature and avoid frequent intervention of the PTC without intervention of the PTC, the system will select appropriate PI control parameters according to the actual temperature difference. For example, when the temperature difference is large (such as -10°C), the system will select higher Kp and Ki values ​​to ensure that the three-way proportional valve can respond quickly and adjust the water temperature, thereby speeding up the speed of reaching the target temperature. As the temperature difference decreases (for example, from -10°C to 0°C), the system will dynamically adjust the values ​​of Kp and Ki to achieve smoother water temperature regulation and reduce unnecessary energy consumption.

[0042] In a specific application scenario, when the temperature demand in the car suddenly increases, the system detects a large temperature difference between the actual water outlet temperature and the target temperature. For example, assuming the temperature difference is -10°C, the system will look up the Kp and Ki values ​​in the PI control mapping relationship and immediately adjust the opening of the three-way proportional valve to reduce the flow of the cooling medium, thereby quickly raising the water temperature. During this process, the system will continuously monitor the changes in the temperature difference and update the PI control parameters in real time to ensure that the water temperature can approach the target value in a short time.

[0043] As the water temperature approaches the target temperature, the temperature difference gradually decreases, and the system will reduce the values ​​of Kp and Ki accordingly, slowing down the opening adjustment speed of the three-way proportional valve to avoid water temperature overshoot. When the temperature difference is reduced to close to 0°C, the opening of the three-way proportional valve will remain in a relatively stable state to ensure that the water temperature is maintained near the set value, and effectively avoid premature or unnecessary intervention of the PTC heating unit.

[0044] Through this temperature difference-based PI control strategy, this embodiment can achieve rapid and efficient adjustment of the passenger compartment water temperature without the intervention of the PTC heating unit, maximizing the energy-saving advantages of the heat pump air conditioning system. This method not only improves the response speed of the system, but also avoids frequent activation of the PTC by reasonably controlling the opening of the three-way proportional valve, thereby further reducing the overall energy consumption.

[0045] In some embodiments, the opening of the three-way proportional valve of the passenger compartment is adjusted according to the temperature difference and the intervention state of the PTC heating unit, including:

[0046] When the intervention state is to intervene in auxiliary heating of the passenger compartment, according to the temperature difference, a second mapping relationship between a preset temperature difference and a proportional integral and an integral coefficient in the PI control is queried to obtain a second proportional coefficient and a second integral coefficient corresponding to the temperature difference, wherein when the temperature difference decreases, the values ​​of the proportional coefficient and the integral coefficient gradually decrease;

[0047] The second proportional coefficient and the second integral coefficient are used to adjust the opening of the three-way proportional valve in the passenger compartment. During the adjustment of the opening of the three-way proportional valve in the passenger compartment, the speed of the compressor is adjusted so that the water temperature can be smoothly adjusted when the PTC heating unit intervenes in auxiliary heating.

[0048] Specifically, the embodiment of the present application also introduces a method in which, in a vehicle-mounted heat pump air-conditioning system, when a PTC heating unit intervenes in operation, a control strategy of a three-way proportional valve in the passenger compartment is used to achieve smooth regulation of the water temperature, thereby ensuring the stability and energy efficiency of the system.

[0049] When the PTC heating unit is involved, the system needs to coordinate the control of the opening of the three-way proportional valve in the passenger compartment and the speed of the compressor to achieve smooth adjustment of the water temperature during the heating process and avoid unnecessary energy consumption caused by temperature fluctuations. As shown in Table 2, this is the proportional integral control (PI control) coefficient mapping relationship table when the PTC heating unit is involved, referred to as the PI control coefficient mapping relationship table.

[0050] Table 2 PI control coefficient mapping relationship table when PTC heating unit intervenes

[0051] Temperature difference -10 -5 -3 -2 -1 -0.5 0 Kp -3 -3 -3 -3 -3 -3 -3 Ki -0.2 -0.2 -0.2 -0.2 -0.2 -0.2 0

[0052] Specifically, when the PTC heating unit is involved, the system first queries the pre-created proportional integral control (PI control) coefficient mapping relationship based on the temperature difference between the target water outlet temperature of the PTC heating unit and the actual water outlet temperature. According to the current temperature difference, the system will obtain the corresponding proportional coefficient (Kp) and integral coefficient (Ki), and use these coefficients to adjust the opening of the three-way proportional valve in the passenger compartment.

[0053] For example, when the temperature difference is large (such as -10℃), in order to quickly respond and heat the passenger compartment, the system will select higher Kp and Ki values, making the opening of the three-way proportional valve in the passenger compartment smaller, thereby reducing the circulation of the cooling medium and enhancing the heating effect of the PTC heating unit. At this time, the speed of the compressor will also be adjusted according to actual needs to match the opening change of the three-way proportional valve to ensure that the entire system can quickly raise the water temperature to the target value.

[0054] As the temperature difference decreases, for example, from -10°C to 0°C, the system will dynamically reduce the Kp and Ki values ​​to slow down the opening adjustment speed of the three-way proportional valve in the passenger compartment. This adjustment process makes the water temperature change smoother and avoids temperature fluctuations caused by excessive heating or cooling. At the same time, the speed of the compressor will also be adjusted accordingly to keep pace with the adjustment of the three-way proportional valve, thereby further reducing unnecessary energy consumption.

[0055] In a specific application scenario, when the temperature in the passenger compartment gradually approaches the set value, the system detects that the temperature difference between the actual water outlet temperature and the target temperature is narrowing, the Kp and Ki values ​​will gradually decrease, and the opening of the passenger compartment three-way proportional valve will slowly increase, allowing more cooling medium to flow to prevent the water temperature from continuing to rise. At the same time, the speed of the compressor will be finely adjusted according to the change in the valve opening to maintain the energy efficiency and stability of the entire system.

[0056] Through this collaborative control strategy, the vehicle heat pump air conditioning system in this embodiment can achieve smooth adjustment of water temperature when the PTC heating unit intervenes, avoiding drastic temperature fluctuations and effectively reducing energy consumption. This method not only improves the comfort of the passenger compartment, but also optimizes the overall performance of the heat pump air conditioning system, enabling it to operate more efficiently.

[0057] In some embodiments, determining a proportional coefficient for performing proportional-integral (PI) control on the PTC heating unit according to the temperature difference, and adjusting the output of the PTC heating unit using the proportional coefficient includes:

[0058] According to the temperature difference, a third mapping relationship between a preset temperature difference and a proportional coefficient of the PI control is queried to obtain a third proportional coefficient, and the output of the PTC heating unit is adjusted using the third proportional coefficient;

[0059] Among them, in the third mapping relationship, when the absolute value of the preset temperature difference exceeds the threshold value of the absolute value of the temperature difference, the proportional coefficient tends to decrease with the increase of the absolute value of the temperature difference, and the value of the proportional coefficient is higher than the preset proportional coefficient threshold value. When the absolute value of the preset temperature difference is lower than the threshold value of the absolute value of the temperature difference, the value of the proportional coefficient is lower than the preset proportional coefficient threshold value, and the difference between the proportional coefficient and the adjacent proportional coefficient is greater than the preset value.

[0060] Specifically, the embodiment of the present application also describes a method for adjusting the output of a PTC heating unit in a vehicle-mounted heat pump air-conditioning system based on temperature difference, aiming to optimize system performance, reduce load fluctuations of the compressor, and thus improve overall energy efficiency.

[0061] When the system detects a temperature difference between the actual water outlet temperature of the passenger compartment and the target temperature, the system first determines a proportional coefficient (Kp) based on the temperature difference, and obtains the Kp value by querying the pre-created proportional coefficient mapping relationship. Then, the Kp value is used to adjust the output of the PTC heating unit to achieve precise control of the water temperature. As shown in Table 3, this is a pre-created proportional coefficient mapping relationship table.

[0062] Table 3 Proportional coefficient mapping relationship table

[0063] Temperature difference -5 -3 -1 -0.5 0 1 2 3 Kp -2.5 -0.6 -0.3 0 0 0 -0.5 -1

[0064] Specifically, in the case of a large temperature difference, such as a temperature difference of -5°C or greater, the system will select a higher Kp value. This higher proportionality factor ensures that the output of the PTC heating unit can quickly respond to the temperature difference, thereby accelerating the process of increasing the water temperature. For example, when the temperature difference is -5°C, the Kp value may be set to a relatively large value to ensure that the PTC heating unit can provide sufficient heating power to quickly raise the water temperature to a range close to the target temperature.

[0065] As the water temperature approaches the target temperature and the temperature difference decreases, the system will dynamically adjust the Kp value to gradually decrease. This adjustment gradually weakens the output of the PTC heating unit to avoid overheating, while also reducing the load requirements on the compressor, thereby preventing the compressor from increasing energy consumption due to frequent starting and stopping. For example, when the temperature difference is reduced to close to 0°C, the Kp value will be significantly reduced, and the output of the PTC heating unit will also be reduced accordingly to keep the water temperature stable within the target range.

[0066] In a specific embodiment, if the absolute value of the temperature difference exceeds a preset temperature difference threshold (e.g., 5°C), the system will maintain the Kp value at a higher level to ensure a quick response. However, if the absolute value of the temperature difference is lower than the threshold, the Kp value will drop rapidly, thereby reducing the output of the PTC heating unit. This strategy effectively prevents excessive fluctuations in water temperature and ensures that the compressor has enough time to adjust the water temperature, avoiding reduced energy efficiency due to frequent adjustments.

[0067] Through the above-mentioned PI control strategy based on temperature difference, the vehicle heat pump air conditioning system in this embodiment can effectively adjust the output of the PTC heating unit under different temperature difference conditions to ensure the rapidity and stability of water temperature adjustment. At the same time, the system reduces the load fluctuation of the compressor by reasonably setting the Kp value, thereby improving the operating efficiency of the entire system and extending the service life of the compressor.

[0068] In some embodiments, when the thermal management control scenario of the vehicle heat pump air conditioning system is to set the temperature to increase, the method further includes:

[0069] When the target outlet water temperature is higher than the actual outlet water temperature and the actual outlet water temperature is lower than the preset first temperature threshold, the three-way proportional valves of the passenger compartment are controlled to be completely closed, and the PTC heating unit is controlled to start and provide auxiliary heating to the passenger compartment, so as to increase the temperature of the passenger compartment by using the PTC heating unit to reach the target outlet water temperature;

[0070] When the actual water outlet temperature rises to a point where the difference between it and the target water outlet temperature is less than the preset temperature value, and the opening of the three-way proportional valve in the passenger compartment is less than the preset first opening threshold and greater than 0, the PTC heating unit is controlled to exit auxiliary heating, and the opening of the three-way proportional valve in the passenger compartment is adjusted to ensure that the actual water outlet temperature is within the preset floating range of the target water outlet temperature.

[0071] Specifically, the embodiment of the present application also describes a thermal management control method for a vehicle-mounted heat pump air-conditioning system, which is particularly suitable for achieving a fast and efficient heating process by coordinating the control of the passenger compartment three-way proportional valve and the PTC heating unit when the temperature in the passenger compartment needs to be increased.

[0072] When the system detects that the target water outlet temperature is higher than the actual water outlet temperature, the temperature difference is calculated first. If the actual water outlet temperature is lower than the preset first temperature threshold (e.g. -5°C), the system will close the three-way proportional valve in the passenger compartment to prevent the circulation of the cooling medium, thereby preventing heat loss and ensuring maximum efficiency of the heating process.

[0073] Furthermore, when the three-way proportional valve of the passenger compartment is completely closed, the system starts the PTC heating unit. Since the PTC heating unit has the ability to heat up quickly, the system will use the PTC heating unit for centralized heating at this time, so that the water temperature rises rapidly to approach the target temperature as soon as possible. This strategy effectively reduces the time required for heating, ensuring that the passenger compartment can reach the comfortable temperature required by passengers in a short time.

[0074] Furthermore, as the actual outlet water temperature gradually approaches the target temperature, the system will further optimize the control strategy. When the opening of the three-way proportional valve in the passenger compartment is less than the preset first opening threshold (e.g. 95%), the system will control the PTC heating unit to gradually exit operation. This process is to avoid overheating and temperature overshoot, ensure temperature stability, and reduce energy consumption.

[0075] Furthermore, after the PTC heating unit stops running, the system will continue to finely control the temperature by adjusting the opening of the three-way proportional valve in the passenger compartment. Specifically, the opening of the three-way proportional valve in the passenger compartment will be dynamically adjusted according to the real-time temperature difference to ensure that the actual water outlet temperature is stable within the preset floating range of the target temperature. Through this adjustment, the system can maintain the temperature in the passenger compartment within a comfortable range to avoid overcooling or overheating.

[0076] For example, in an actual application scenario, when the system detects that the water temperature is lower than -5°C, the three-way proportional valve in the passenger compartment will be completely closed, and the PTC heating unit will be immediately started for rapid heating. When the water temperature approaches the target temperature (such as 0°C), the opening of the three-way proportional valve in the passenger compartment will remain within a range of less than 95%, at which time the PTC heating unit will gradually stop working. Next, the system fine-tunes the opening of the three-way proportional valve in the passenger compartment to ensure that the water temperature can be stabilized near the target temperature to avoid discomfort to passengers due to temperature fluctuations.

[0077] Through the above-mentioned method of this embodiment, when the temperature of the passenger compartment needs to be increased, this embodiment can utilize the rapid response capability of the PTC heating unit and the fine adjustment of the passenger compartment three-way proportional valve to achieve efficient temperature control and ensure the energy efficiency of the system and the comfort of the passengers.

[0078] In some embodiments, when the thermal management control scenario of the vehicle heat pump air conditioning system is to set the temperature to be lowered, the method further includes:

[0079] When the target water outlet temperature is lower than the actual water outlet temperature and the actual water outlet temperature is higher than the preset second temperature threshold, the three-way proportional valve of the passenger compartment is controlled to be fully opened, and the PTC heating unit is controlled not to intervene in auxiliary heating of the passenger compartment;

[0080] When the actual water outlet temperature drops to a level where the difference between it and the target water outlet temperature is less than the preset temperature value, the three-way proportional valve in the passenger compartment is controlled to close gradually, and the PTC heating unit is controlled to intervene in auxiliary heating or exit auxiliary heating according to the current water temperature.

[0081] Specifically, the embodiment of the present application also provides a thermal management control method suitable for a vehicle-mounted heat pump air-conditioning system, especially when the temperature in the passenger compartment needs to be lowered, by coordinating the control of the passenger compartment three-way proportional valve and the PTC heating unit, rapid cooling and stable control of the water temperature can be achieved.

[0082] When the system detects that the target outlet water temperature is lower than the actual outlet water temperature, the temperature difference is calculated first. If the actual outlet water temperature is higher than the preset second temperature threshold (e.g. 5°C), the system will open the three-way proportional valve in the passenger compartment. This operation is to increase the circulation of the cooling medium, thereby accelerating the decrease of the actual outlet water temperature and approaching the target temperature as soon as possible.

[0083] Furthermore, when the three-way proportional valve in the passenger compartment is open, the system will stop the operation of the PTC heating unit and make it exit the working state. This is to avoid continued heating, thereby preventing energy waste and ensuring that the water temperature can be effectively reduced. When the PTC heating unit stops running, the system mainly achieves cooling by controlling the three-way proportional valve in the passenger compartment.

[0084] Furthermore, as the actual outlet water temperature gradually approaches the target temperature, the system will detect the temperature difference between the target outlet water temperature and the actual outlet water temperature. When the temperature difference gradually decreases, the system will gradually close the three-way proportional valve in the passenger compartment to reduce the circulation speed of the cooling medium, thereby smoothing the temperature drop process. This control method can prevent the temperature from dropping too quickly and avoid the temperature in the passenger compartment from being too cold.

[0085] Furthermore, when the actual outlet water temperature approaches or reaches the target outlet water temperature, the system will flexibly control the intervention or exit of the PTC heating unit according to the current water temperature conditions. If the system detects that the water temperature may continue to drop below the target temperature, the PTC heating unit may be timely intervened to slightly heat the water to maintain temperature stability; conversely, if the water temperature is stable near the target temperature, the system will keep the PTC heating unit exited and rely on the precise control of the three-way proportional valve to maintain the water temperature.

[0086] For example, in an actual application scenario, when the system detects that the target water temperature is lower than the actual water temperature and the actual water temperature is higher than 5°C, the three-way proportional valve in the passenger compartment will be fully opened to accelerate the drop in water temperature, and the PTC heating unit will stop working. When the water temperature gradually drops and approaches the target value, the system will gradually close the three-way proportional valve to slow down the cooling rate and avoid overcooling. When the water temperature approaches the target temperature, the system will decide whether to re-intervene the PTC heating unit based on the current temperature status, or continue to maintain temperature stability through adjustment of the three-way proportional valve.

[0087] Through the above-mentioned method of this embodiment, this embodiment can achieve rapid and stable adjustment of the water temperature in the scenario where the temperature of the passenger compartment needs to be lowered, ensuring the energy efficiency optimization of the system while providing comfortable passenger compartment temperature control.

[0088] In some embodiments, when the thermal management control scenario of the vehicle heat pump air conditioning system is a stable water temperature stage, the method further includes:

[0089] When the temperature difference between the target water outlet temperature and the actual water outlet temperature is less than the preset temperature difference range, the opening of the three-way proportional valve in the passenger compartment is controlled to be adjusted to less than the preset second opening threshold, and the PTC heating unit is controlled not to intervene in auxiliary heating of the passenger compartment.

[0090] Specifically, the embodiment of the present application also provides a thermal management control method for a vehicle-mounted heat pump air-conditioning system, which is particularly suitable for the stage where the temperature in the passenger compartment needs to be kept stable. By accurately controlling the opening of the passenger compartment three-way proportional valve and the state of the PTC heating unit, the water temperature can be smoothly controlled.

[0091] When the system enters the stable water temperature stage, the temperature difference between the target outlet water temperature and the actual outlet water temperature is usually very small. Specifically, when the temperature difference is less than the preset temperature difference range (such as ±1°C), the system will take a series of fine control measures to maintain the stability of the water temperature.

[0092] First, the system will adjust the opening of the three-way proportional valve in the passenger compartment to less than the preset second opening threshold (such as 95%). This adjustment is to reduce the circulation of the cooling medium to avoid excessive fluctuations in water temperature while ensuring that the system can accurately maintain the current temperature state. By keeping the opening of the three-way proportional valve within a lower range, the system can better control small changes in water temperature, thereby preventing water temperature fluctuations caused by excessive opening.

[0093] Furthermore, after the opening of the three-way proportional valve in the passenger compartment is adjusted to a smaller range, the system will also adjust the working state of the PTC heating unit. Specifically, when the temperature difference is small enough and the water temperature tends to be stable, the system will control the PTC heating unit to stop working to ensure that it no longer intervenes in the temperature adjustment process. This measure not only helps to reduce energy consumption, but also avoids temperature fluctuations caused by frequent intervention of the PTC heating unit.

[0094] For example, in an actual operation scenario, when the difference between the target water temperature and the actual water temperature in the passenger compartment is less than ±1°C, the system detects that the temperature difference has entered the preset stable range. At this time, the opening of the three-way proportional valve in the passenger compartment will be automatically adjusted to less than 95% to ensure that the flow of the cooling medium remains at a moderate level. At the same time, the system will turn off the PTC heating unit to stop heating, thereby preventing temperature overshoot or over-adjustment.

[0095] Through the method of the present embodiment described above, the vehicle heat pump air conditioning system in the present embodiment can accurately control the fine adjustment of the water temperature when the water temperature is close to being stable, thereby ensuring the stability and comfort of the temperature in the passenger compartment. At the same time, by reasonably adjusting the opening of the three-way proportional valve and closing the PTC heating unit, the system effectively reduces energy consumption and prolongs the service life of the equipment, thereby improving the operating efficiency of the overall system.

[0096] The following is a description of the data comparison before and after the thermal management control strategy of the vehicle heat pump air conditioning system of the present application is processed in combination with actual experimental data. The actual data comparison results before and after the optimization of the control logic are as follows:

[0097] Data before optimization: The set temperature remains unchanged. When the heat demand decreases, the opening of the three-way valve in the passenger compartment becomes smaller, and the hot water cools down after entering the electric drive circuit. However, at this time, the PTC maintains a 15% opening for heating, causing unnecessary energy loss.

[0098] Optimized data: When the set temperature changes sharply or is in a steady state, the heat demand changes greatly. After adding the optimized control logic, the PTC is enabled and disabled through logic after the proportional valve of the passenger compartment three-way valve is opened or closed according to the heat demand. It is ensured that when the three-way valve opening becomes smaller to dissipate heat, the PTC is always in the closed state to avoid energy loss. At the same time, it can also achieve rapid enabling when there is a large heat demand, ensuring and improving the comfort of the driver and passengers.

[0099] According to the technical solution provided in the embodiments of the present application, the technical solution of the present application has at least the following advantages:

[0100] The vehicle-mounted heat pump air-conditioning system of the present application avoids unreasonable energy consumption losses from the control logic by optimizing the control strategy, realizes the maximum utilization of the advantages of the heat pump, and thus effectively improves the economy of the entire vehicle.

[0101] First, by accurately matching the operating status of the passenger compartment three-way valve and the passenger compartment PTC heating unit, the technical solution of this application can avoid unnecessary energy consumption caused by the dynamic balance between the hot water released by the three-way valve and the continuous heating water temperature of the PTC under changing heat demand or steady-state conditions. This optimization strategy effectively prevents unnecessary heat loss in the system, thereby significantly reducing overall energy consumption and enhancing the vehicle's endurance.

[0102] Secondly, by finely adjusting the compressor speed, the three-way proportional valve in the passenger compartment, and the PID parameters of the passenger compartment PTC, the technical solution of this application can not only speed up the temperature rise and fall speed, but also provide a smoother transition during the temperature adjustment process. This control strategy ensures that the temperature in the passenger compartment can quickly reach the target value and remain within a comfortable range, thereby significantly improving the comfort of the driver and passengers.

[0103] Therefore, in summary, the technical solution of the present application achieves reduced energy consumption and improved temperature control performance by optimizing control logic and PID parameter adjustment, which not only improves the economy of the vehicle, but also enhances the comfort of the passenger compartment, and provides a more efficient and reliable solution for the application of vehicle-mounted heat pump air-conditioning systems.

[0104] The following is an embodiment of the device of the present application, which can be used to execute the embodiment of the method of the present application. For details not disclosed in the embodiment of the device of the present application, please refer to the embodiment of the method of the present application.

[0105] Figure 2 Schematic diagram of the structure of the temperature control device based on the vehicle heat pump air conditioning system provided by the embodiment of the present application. The circuit of the vehicle heat pump air conditioning system includes a passenger compartment positive temperature coefficient thermistor PTC heating unit and a passenger compartment three-way proportional valve, such as Figure 2 As shown, the temperature regulating device based on the vehicle-mounted heat pump air conditioning system includes:

[0106] The adjustment module 201 adjusts the speed of the compressor in the vehicle heat pump air conditioning system according to the temperature difference between the target water outlet temperature and the actual water outlet temperature of the PTC heating unit when the vehicle heat pump air conditioning system is in the passenger compartment dehumidification mode, so as to control the temperature difference to reach the target temperature difference;

[0107] A first regulating module 202 regulates the opening of the three-way proportional valve of the passenger compartment to regulate the water temperature according to the temperature difference and the intervention state of the PTC heating unit, wherein the intervention state includes whether the PTC heating unit intervenes in the passenger compartment to provide auxiliary heating or not intervenes in the passenger compartment to provide auxiliary heating;

[0108] The second regulating module 203 determines a proportional coefficient for proportional integral (PI) control of the PTC heating unit according to the temperature difference, and uses the proportional coefficient to regulate the output of the PTC heating unit to control the on or off of the PTC heating unit so as to regulate the water temperature.

[0109] In some embodiments, Figure 2 When the intervention state is that auxiliary heating is not provided to the passenger compartment, the first regulating module 202 queries a first mapping relationship between a pre-created preset temperature difference and a proportional coefficient and an integral coefficient in the PI control according to the temperature difference to obtain a first proportional coefficient and a first integral coefficient corresponding to the temperature difference; and uses the first proportional coefficient and the first integral coefficient to adjust the opening of the three-way proportional valve in the passenger compartment so as to quickly adjust the water temperature when the PTC heating unit is not provided with auxiliary heating.

[0110] In some embodiments, Figure 2 When the intervention state is to intervene in auxiliary heating of the passenger compartment, the first regulating module 202 queries the second mapping relationship between the pre-created preset temperature difference and the proportional integral and the integral coefficient in the PI control according to the temperature difference, and obtains the second proportional coefficient and the second integral coefficient corresponding to the temperature difference, wherein when the temperature difference decreases, the values ​​of the proportional coefficient and the integral coefficient gradually decrease; the second proportional coefficient and the second integral coefficient are used to adjust the opening of the three-way proportional valve of the passenger compartment, and in the process of adjusting the opening of the three-way proportional valve of the passenger compartment, the speed of the compressor is adjusted so as to smoothly adjust the water temperature when the PTC heating unit intervenes in auxiliary heating.

[0111] In some embodiments, Figure 2The second adjustment module 203 queries the third mapping relationship between the pre-created preset temperature difference and the proportional coefficient of the PI control according to the temperature difference, obtains the third proportional coefficient, and uses the third proportional coefficient to adjust the output of the PTC heating unit; wherein, in the third mapping relationship, when the absolute value of the preset temperature difference exceeds the threshold value of the absolute value of the temperature difference, the proportional coefficient tends to decrease with the increase of the absolute value of the temperature difference, and the value of the proportional coefficient is higher than the preset proportional coefficient threshold value, and when the absolute value of the preset temperature difference is lower than the threshold value of the absolute value of the temperature difference, the value of the proportional coefficient is lower than the preset proportional coefficient threshold value, and the difference between the proportional coefficient and the adjacent proportional coefficient is greater than the preset value.

[0112] In some embodiments, when the thermal management control scenario of the vehicle heat pump air conditioning system is to set the temperature to increase, Figure 2 The second regulating module 203 controls all the three-way proportional valves in the passenger compartment to close, controls the PTC heating unit to start and intervene in auxiliary heating of the passenger compartment, so as to utilize the PTC heating unit to heat the passenger compartment to reach the target water outlet temperature, when the target water outlet temperature is higher than the actual water outlet temperature and the actual water outlet temperature is lower than the preset first temperature threshold. When the actual water outlet temperature rises to a value less than the preset temperature value compared with the target water outlet temperature and the opening of the three-way proportional valve in the passenger compartment is less than the preset first opening threshold and greater than 0, controls the PTC heating unit to exit the auxiliary heating and adjusts the opening of the three-way proportional valve in the passenger compartment to make the actual water outlet temperature within the preset floating range of the target water outlet temperature.

[0113] In some embodiments, when the thermal management control scenario of the vehicle heat pump air conditioning system is to set the temperature to decrease, Figure 2 The second regulating module 203 controls all the three-way proportional valves in the passenger compartment to open when the target water outlet temperature is lower than the actual water outlet temperature and the actual water outlet temperature is higher than a preset second temperature threshold, and controls the PTC heating unit not to intervene in auxiliary heating of the passenger compartment; when the actual water outlet temperature drops to a value where the difference between the actual water outlet temperature and the target water outlet temperature is less than a preset temperature value, controls the three-way proportional valves in the passenger compartment to close gradually, and controls the PTC heating unit to intervene in auxiliary heating or exit auxiliary heating according to the current water temperature.

[0114] In some embodiments, when the thermal management control scenario of the vehicle heat pump air conditioning system is in the stable water temperature stage, Figure 2 When the temperature difference between the target water outlet temperature and the actual water outlet temperature is less than a preset temperature difference range, the second regulating module 203 controls the opening of the three-way proportional valve in the passenger compartment to be adjusted to be less than a preset second opening threshold, and controls the PTC heating unit not to intervene in auxiliary heating of the passenger compartment.

[0115] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0116] Figure 3 Schematic diagram of the structure of the electronic device 3 provided in the embodiment of the present application. Figure 3 As shown, the electronic device 3 of this embodiment includes: a processor 301, a memory 302, and a computer program 303 stored in the memory 302 and executable on the processor 301. When the processor 301 executes the computer program 303, the steps in the above-mentioned method embodiments are implemented. Alternatively, when the processor 301 executes the computer program 303, the functions of the modules / units in the above-mentioned device embodiments are implemented.

[0117] Exemplarily, the computer program 303 may be divided into one or more modules / units, which are stored in the memory 302 and executed by the processor 301 to complete the present application. The one or more modules / units may be a series of computer program instruction segments capable of completing specific functions, which are used to describe the execution process of the computer program 303 in the electronic device 3.

[0118] The electronic device 3 may be a desktop computer, a notebook, a PDA, a cloud server, or other electronic device. The electronic device 3 may include, but is not limited to, a processor 301 and a memory 302. Those skilled in the art will appreciate that Figure 3 It is only an example of the electronic device 3 and does not constitute a limitation of the electronic device 3. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the electronic device may also include input and output devices, network access devices, buses, etc.

[0119] The processor 301 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.

[0120] The memory 302 may be an internal storage unit of the electronic device 3, for example, a hard disk or memory of the electronic device 3. The memory 302 may also be an external storage device of the electronic device 3, for example, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the electronic device 3. Further, the memory 302 may also include both an internal storage unit and an external storage device of the electronic device 3. The memory 302 is used to store computer programs and other programs and data required by the electronic device. The memory 302 may also be used to temporarily store data that has been output or is to be output.

[0121] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0122] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0123] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0124] In the embodiments provided in the present application, it should be understood that the disclosed devices / computer equipment and methods can be implemented in other ways. For example, the device / computer equipment embodiments described above are only schematic. For example, the division of modules or units is only a logical function division. There may be other division methods in actual implementation. Multiple units or components 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 units, which can be electrical, mechanical or other forms.

[0125] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0126] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0127] If the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. The computer program may include computer program code, which may be in source code form, object code form, executable file or some intermediate form. Computer-readable media may include: any entity or device capable of carrying computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium, etc.

[0128] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. 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 of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A temperature adjustment method based on a vehicle heat pump air conditioning system, wherein the circuit of the vehicle heat pump air conditioning system includes a passenger compartment positive temperature coefficient thermistor PTC heating unit and a passenger compartment three-way proportional valve, characterized in that: include: When the vehicle heat pump air conditioning system is in a passenger compartment dehumidification mode, adjusting the speed of the compressor in the vehicle heat pump air conditioning system according to the temperature difference between the target water outlet temperature and the actual water outlet temperature of the PTC heating unit to control the temperature difference to reach the target temperature difference; According to the temperature difference and the intervention state of the PTC heating unit, the opening of the three-way proportional valve of the passenger compartment is adjusted to adjust the water temperature, wherein the intervention state includes the PTC heating unit intervening in auxiliary heating of the passenger compartment and not intervening in auxiliary heating of the passenger compartment; A proportional coefficient for proportional-integral (PI) control of the PTC heating unit is determined according to the temperature difference, and the output of the PTC heating unit is adjusted using the proportional coefficient to control the on or off of the PTC heating unit so as to adjust the water temperature.

2. The method according to claim 1, characterized in that According to the temperature difference and the intervention state of the PTC heating unit, the opening of the three-way proportional valve of the passenger compartment is adjusted, including: When the intervention state is that auxiliary heating is not provided to the passenger compartment, a first mapping relationship between a preset temperature difference and a proportional coefficient and an integral coefficient in PI control created in advance is queried according to the temperature difference to obtain a first proportional coefficient and a first integral coefficient corresponding to the temperature difference; The first proportional coefficient and the first integral coefficient are used to adjust the opening of the three-way proportional valve in the passenger compartment, so as to quickly adjust the water temperature when the PTC heating unit is not involved in auxiliary heating.

3. The method according to claim 1, characterized in that According to the temperature difference and the intervention state of the PTC heating unit, the opening of the three-way proportional valve of the passenger compartment is adjusted, including: When the intervention state is to intervene in auxiliary heating of the passenger compartment, according to the temperature difference, a second mapping relationship between a preset temperature difference and a proportional integral and an integral coefficient in PI control is queried to obtain a second proportional coefficient and a second integral coefficient corresponding to the temperature difference, wherein when the temperature difference decreases, the values ​​of the proportional coefficient and the integral coefficient gradually decrease; The second proportional coefficient and the second integral coefficient are used to adjust the opening of the passenger compartment three-way proportional valve, and during the opening adjustment process of the passenger compartment three-way proportional valve, the speed of the compressor is adjusted so that the water temperature can be smoothly adjusted when the PTC heating unit intervenes in auxiliary heating.

4. The method according to claim 1, characterized in that: The step of determining a proportional coefficient for performing proportional-integral (PI) control on the PTC heating unit according to the temperature difference, and adjusting the output of the PTC heating unit using the proportional coefficient comprises: According to the temperature difference, query a third mapping relationship between a preset temperature difference and a proportional coefficient of PI control to obtain a third proportional coefficient, and use the third proportional coefficient to adjust the output of the PTC heating unit; Among them, in the third mapping relationship, when the absolute value of the preset temperature difference exceeds the threshold value of the absolute value of the temperature difference, the proportional coefficient tends to decrease with the increase of the absolute value of the temperature difference, and the value of the proportional coefficient is higher than the preset proportional coefficient threshold value. When the absolute value of the preset temperature difference is lower than the threshold value of the absolute value of the temperature difference, the value of the proportional coefficient is lower than the preset proportional coefficient threshold value, and the difference between the proportional coefficient and the adjacent proportional coefficient is greater than the preset value.

5. The method according to claim 1, characterized in that When the thermal management control scenario of the vehicle-mounted heat pump air conditioning system is to set the temperature to increase, the method further includes: When the target water outlet temperature is higher than the actual water outlet temperature and the actual water outlet temperature is lower than a preset first temperature threshold, the three-way proportional valves of the passenger compartment are controlled to be completely closed, and the PTC heating unit is controlled to start and provide auxiliary heating to the passenger compartment, so as to increase the temperature of the passenger compartment by using the PTC heating unit to reach the target water outlet temperature; When the difference between the actual water outlet temperature and the target water outlet temperature is less than the preset temperature value, and the opening of the passenger compartment three-way proportional valve is less than the preset first opening threshold and greater than 0, the PTC heating unit is controlled to exit auxiliary heating, and the opening of the passenger compartment three-way proportional valve is adjusted to make the actual water outlet temperature within the preset floating range of the target water outlet temperature.

6. The method according to claim 1, characterized in that When the thermal management control scenario of the vehicle-mounted heat pump air conditioning system is to set a lower temperature, the method further includes: When the target water outlet temperature is lower than the actual water outlet temperature and the actual water outlet temperature is higher than a preset second temperature threshold, the three-way proportional valve of the passenger compartment is controlled to be fully opened, and the PTC heating unit is controlled not to intervene in auxiliary heating of the passenger compartment; When the difference between the actual water outlet temperature and the target water outlet temperature is less than a preset temperature value, the three-way proportional valve of the passenger compartment is controlled to be gradually closed, and the PTC heating unit is controlled to intervene in auxiliary heating or exit auxiliary heating according to the current water temperature.

7. The method according to claim 1, characterized in that When the thermal management control scenario of the vehicle-mounted heat pump air-conditioning system is a stable water temperature stage, the method further includes: When the temperature difference between the target water outlet temperature and the actual water outlet temperature is less than the preset temperature difference range, the opening of the passenger compartment three-way proportional valve is controlled to be adjusted to be less than the preset second opening threshold, and the PTC heating unit is controlled not to intervene in auxiliary heating of the passenger compartment.

8. A temperature regulating device based on a vehicle-mounted heat pump air conditioning system, wherein the circuit of the vehicle-mounted heat pump air conditioning system includes a passenger compartment positive temperature coefficient thermistor PTC heating unit and a passenger compartment three-way proportional valve, characterized in that: include: an adjustment module, when the vehicle heat pump air conditioning system is in a passenger compartment dehumidification mode, adjusting the speed of the compressor in the vehicle heat pump air conditioning system according to the temperature difference between the target water outlet temperature and the actual water outlet temperature of the PTC heating unit, so as to control the temperature difference to reach the target temperature difference; a first regulating module, adjusting the opening of the three-way proportional valve of the passenger compartment to regulate the water temperature according to the temperature difference and the intervention state of the PTC heating unit, wherein the intervention state includes whether the PTC heating unit intervenes in auxiliary heating of the passenger compartment and whether the PTC heating unit does not intervene in auxiliary heating of the passenger compartment; The second regulating module determines a proportional coefficient for proportional-integral (PI) control of the PTC heating unit according to the temperature difference, and uses the proportional coefficient to regulate the output of the PTC heating unit to control the opening or closing of the PTC heating unit so as to regulate the water temperature.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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