Integrated thermal management system for whole heavy truck

Abstract

The invention discloses a heavy truck integrated thermal management system which can be applied to the technical field of new energy automobile thermal management. The heat pump air conditioner loop, the battery heat management loop, the heating and ventilation loop and the motor heat management loop are arranged for heat management of all the loops, and therefore waste heat of the heavy truck can be effectively utilized; the heat pump air conditioner loop, the battery heat management loop, the heating and ventilation loop and the motor heat management loop are coupled together through the second heat exchanger, the multi-medium heat exchanger is adopted as the second heat exchanger to achieve the flowing process of a plurality of heat exchange media, and therefore effective utilization of waste heat of the heavy truck can be achieved in the limited space of the heavy truck.

Description

Technical Field

[0001] The present application relates to the field of thermal management technology for new energy vehicles, and in particular to an integrated thermal management system for a heavy-duty truck. Background Art

[0002] In related technologies, with the transformation of the global energy structure and the improvement of environmental protection requirements, heavy-duty new energy vehicles are gradually becoming an important development direction in the future transportation field. Heavy-duty vehicles generate a large amount of waste heat during operation. For example, the charging and discharging process of the battery and the operation of the motor all generate heat. If this waste heat is not effectively utilized, it will not only lead to energy waste, but may also affect the vehicle's thermal balance and increase the burden on the cooling system. Since the current integrated thermal management system of heavy-duty trucks usually includes multiple subsystems that require thermal management in terms of integration and design and development, these subsystems will generate different heat loads during operation and have different temperature control requirements, resulting in a high degree of complexity in the coordination and integration of the thermal management system. In addition, the internal space of heavy-duty trucks is limited, making it difficult to carry out efficient heat exchange and energy distribution in heavy-duty trucks, and thus difficult to effectively manage the heat load generated by heavy-duty trucks.

[0003] In summary, the technical problems existing in the relevant technologies need to be improved. Summary of the Invention

[0004] The main purpose of the embodiments of the present application is to propose an integrated thermal management system for a heavy-duty truck, which can effectively utilize the waste heat of the heavy-duty truck within the limited space of the heavy-duty truck.

[0005] To achieve the above objectives, the present application proposes an integrated thermal management system for a heavy-duty truck, the system comprising a heat pump air conditioning circuit, a battery thermal management circuit, a heating and ventilation circuit, and a motor thermal management circuit;

[0006] The heat pump air conditioning circuit, the battery thermal management circuit, the HVAC circuit and the motor thermal management circuit are coupled via a second heat exchanger; the second heat exchanger is a multi-media heat exchanger;

[0007] The heat pump air conditioning circuit performs heat exchange through refrigerant, the ventilation circuit performs heat exchange through coolant, and the battery thermal management circuit and the motor thermal management circuit both perform heat exchange through water.

[0008] In some embodiments, the heat pump air conditioning circuit includes a condenser, an evaporator, a first heat exchanger, the second heat exchanger, and a compressor;

[0009] The input end of the condenser is connected to the first output end of the first gas heater, and the output end of the condenser is respectively connected to the input end of the evaporator, the first input end of the second heat exchanger, and the input end of the compressor;

[0010] The output end of the evaporator is connected to the input end of the compressor;

[0011] The first output end of the second heat exchanger is connected to the input end of the compressor;

[0012] The output end of the compressor is connected to the first input end of the first gas heater.

[0013] In some embodiments, the HVAC circuit includes a warm air core, a heater, the first heat exchanger, a four-way valve, and a third water pump;

[0014] The first end of the heater core is connected to the first input end of the four-way valve, and the second end of the heater core is connected to the first end of the heater;

[0015] The input end of the third water pump is connected to the first output end of the four-way valve;

[0016] The output end of the third water pump is connected to the second input end of the first heat exchanger;

[0017] The second output end of the first heat exchanger is connected to the second end of the heater.

[0018] In some embodiments, the HVAC circuit further includes a first three-way valve and the second heat exchanger;

[0019] The input end of the first three-way valve is connected to the first end of the heater core;

[0020] The first output end of the first three-way valve is connected to the second input end of the second heat exchanger, and the second output end of the first three-way valve is connected to the first input end of the four-way valve;

[0021] The second input end of the four-way valve is connected to the second output end of the second heat exchanger, and the second output end of the four-way valve is connected to the second liquid storage tank.

[0022] In some embodiments, the battery thermal management loop includes a battery, the second heat exchanger, and a second water pump;

[0023] The output end of the battery is connected to the third input end of the second heat exchanger;

[0024] The third output end of the second heat exchanger is connected to the input end of the second water pump;

[0025] The output end of the water pump is connected to the input end of the battery.

[0026] In some embodiments, the motor thermal management circuit includes a motor, a radiator, a first water pump, and the second heat exchanger;

[0027] The fourth output end of the second heat exchanger is connected to the input end of the first water pump;

[0028] The output end of the first water pump is connected to the input end of the motor;

[0029] The output end of the motor is connected to the input end of the radiator;

[0030] The output end of the radiator is connected to the fourth input end of the second heat exchanger.

[0031] In some embodiments, a vapor-liquid separator is further provided at the input end of the compressor.

[0032] In some embodiments, a first solenoid valve is provided between the output end of the condenser and the input end of the evaporator; and a second solenoid valve is provided between the condenser and the input end of the vapor-liquid separator.

[0033] In some embodiments, a first electronic expansion valve is provided between the output end of the first solenoid valve and the input end of the evaporator; a second electronic expansion valve is provided between the first output end of the first heat exchanger and the input end of the condenser.

[0034] In some embodiments, the motor thermal management circuit further includes a second three-way valve and a third three-way valve;

[0035] The input end of the second three-way valve is connected to the output end of the motor; the first output end of the second three-way valve is connected to the input end of the radiator, and the second output end of the second three-way valve is connected to the input end of the third three-way valve;

[0036] The first output end of the third three-way valve is connected to the input end of the first water pump; the second output end of the third three-way valve is connected to the fourth input end of the second heat exchanger.

[0037] The embodiments of the present application include at least the following beneficial effects: The present application provides an integrated thermal management system for a heavy-duty truck, which performs thermal management of each circuit by setting up a heat pump air-conditioning circuit, a battery thermal management circuit, a HVAC circuit and a motor thermal management circuit, thereby effectively utilizing the waste heat of the heavy-duty truck, and couples the heat pump air-conditioning circuit, the battery thermal management circuit, the HVAC circuit and the motor thermal management circuit together through a second heat exchanger, and adopts a multi-media heat exchanger as the second heat exchanger to realize the flow process of multiple heat exchange media, thereby realizing the effective utilization of the waste heat of the heavy-duty truck within the limited space of the heavy-duty truck. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the integrated thermal management system for a heavy-duty truck provided in an embodiment of the present application. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the embodiments of the present application. They are merely examples of devices and methods consistent with some aspects of the embodiments of the present application.

[0040] It will be understood that the terms "first", "second", etc. used in this application may be used herein to describe various concepts, but unless otherwise specified, these concepts are not limited by these terms. These terms are only used to distinguish one concept from another. For example, without departing from the scope of the embodiments of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the words "if" and "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0041] The terms "at least one", "plurality", "each", "any", etc. used in this application include "at least one", "two" or more, "plurality" or "each", "any" or "any one", "each" or "any one" as used herein.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein are for the purpose of describing the embodiments of this application only and are not intended to limit this application.

[0043] Before describing the embodiments of the present application in detail, some of the nouns and terms involved in the embodiments of the present application are first explained. The nouns and terms involved in the embodiments of the present application are subject to the following interpretations:

[0044] PTC (Positive Temperature Coefficient) refers to the phenomenon that its resistance increases significantly with increasing temperature. PTC heaters use this characteristic to increase resistance sharply after the temperature reaches the Curie temperature, thereby automatically adjusting the temperature to maintain a constant value.

[0045] In the current state of the art, the integration and design of integrated thermal management systems for heavy-duty trucks typically involve multiple subsystems requiring thermal management. These subsystems generate varying heat loads during operation and have distinct temperature control requirements, leading to high complexity in the coordination and integration of thermal management systems. Furthermore, the limited interior space of heavy-duty trucks makes efficient heat exchange and energy distribution, and consequently, effective management of the generated heat load, difficult.

[0046] In view of this, an embodiment of the present application provides an integrated thermal management system for a heavy-duty truck, which can effectively utilize the waste heat of the heavy-duty truck within the limited space of the heavy-duty truck.

[0047] The following is a detailed description of the embodiments of the present application with reference to the accompanying drawings:

[0048] An embodiment of the present application provides an integrated thermal management system for a heavy-duty truck, comprising a heat pump air conditioning circuit, a battery thermal management circuit, a heating and ventilation circuit, and a motor thermal management circuit. The heat pump air conditioning circuit, the battery thermal management circuit, the heating and ventilation circuit, and the motor thermal management circuit are coupled via a second heat exchanger, which is a multi-media heat exchanger. Heat exchange occurs within the heat pump air conditioning circuit using a refrigerant, within the ventilation circuit using a coolant, and both the battery thermal management circuit and the motor thermal management circuit use water for heat exchange. Specifically, this embodiment can employ R134a as the refrigerant and a 50% ethylene glycol aqueous solution as the coolant.

[0049] Heavy-duty vehicles, understandably, generate significant amounts of waste heat during operation. Multi-media heat exchangers, with their efficient heat exchange capabilities and flexible fluid distribution, can recycle and reuse this waste heat. For example, this waste heat can be used to heat the passenger compartment, improving winter driving comfort. It can also be used to assist with battery thermal management, ensuring optimal battery operation and extending battery life. Furthermore, the refrigerant in heat pump air conditioners absorbs this waste heat through the heat exchanger, allowing for more efficient compression and circulation than absorbing heat from the environment, thereby improving the efficiency of the entire heat pump air conditioner system. By utilizing waste heat in multi-media heat exchangers, heavy-duty new energy vehicles can not only improve overall energy efficiency and reduce energy waste, but also optimize the performance of the thermal management system and lower operating costs. Furthermore, this integrated thermal management solution can simplify the system architecture, reduce vehicle weight and space requirements, and open up new possibilities for vehicle design and performance improvements.

[0050] In the embodiments of this application, Figure 1As shown, the heat pump air conditioning circuit includes a condenser 111, an evaporator 121, a first heat exchanger 101, a second heat exchanger 102, and a compressor 131. The condenser's input is connected to the first output of the first heat exchanger, while the condenser's output is connected to the evaporator's input, the second heat exchanger's first input, and the compressor's input, respectively. The evaporator's output is connected to the compressor's input; the second heat exchanger's first output is connected to the compressor's input; and the compressor's output is connected to the first input of the first heat exchanger. Specifically, in this embodiment, the condenser's output can be connected to the first input of the second heat exchanger via a third electronic expansion valve 203.

[0051] The HVAC circuit includes a heater core 112, a heater 241, a first heat exchanger 101, a four-way valve 171, and a third water pump 183. The first end of the heater core is connected to the first input of the four-way valve, and the second end of the heater core is connected to the first end of the heater. The input of the third water pump is connected to the first output of the four-way valve; the output of the third water pump is connected to the second input of the first heat exchanger; and the second output of the first heat exchanger is connected to the second end of the heater. The heater in this embodiment can be a PCT heater.

[0052] The battery thermal management circuit includes a battery 151, a second heat exchanger 102, and a second water pump 182. The output of the battery is connected to the third input of the second heat exchanger; the third output of the second heat exchanger is connected to the input of the second water pump; and the output of the water pump is connected to the input of the battery.

[0053] The motor thermal management circuit includes the motor 141, the radiator 113, the first water pump 181, and the second heat exchanger 102. The fourth output of the second heat exchanger is connected to the input of the first water pump 181 via the first liquid storage tank 231; the output of the first water pump is connected to the input of the motor; the output of the motor is connected to the input of the radiator; and the output of the radiator is connected to the fourth input of the second heat exchanger.

[0054] This embodiment manages the heat of heavy trucks by setting up various circuits, thereby effectively utilizing the waste heat generated by heavy trucks.

[0055] It is understandable that if Figure 1 As shown, the input end of the compressor 131 is also provided with a vapor-liquid separator 161, which can remove liquid particles to prevent liquid particles from entering the compressor and then damaging the compressor or reducing the working efficiency of the compressor, effectively extending the service life of the compressor and improving the working efficiency.

[0056] It is understandable that if Figure 1As shown, a first solenoid valve 211 is provided between the output end of the condenser 111 and the input end of the evaporator 121. The first solenoid valve allows the refrigerant to absorb heat in the evaporator, reducing the temperature of the passenger compartment and achieving heat exchange. A second solenoid valve 212 is provided between the condenser 111 and the input end of the vapor-liquid separator 161. The second solenoid valve allows the refrigerant to release heat in the first heat exchanger and then return to the compressor after absorbing heat in the condenser for the next cycle.

[0057] It is understandable that if Figure 1 As shown, a first electronic expansion valve 201 is provided between the output end of the first solenoid valve 211 and the input end of the evaporator 121. When the passenger compartment requires cooling, the first electronic expansion valve can adjust the mass flow of the refrigerant at the evaporator inlet to ensure that the refrigerant at the evaporator inlet is saturated vapor. When the passenger compartment requires heating, the first electronic expansion valve can adjust the mass flow of the refrigerant at the evaporator inlet to ensure that the refrigerant at the condenser inlet is saturated vapor, thereby maintaining the system in optimal operating condition. A second electronic expansion valve 202 is provided between the first output end of the first heat exchanger and the input end of the condenser. The second electronic expansion valve can adjust the mass flow of the refrigerant at the condenser inlet to ensure that the refrigerant at the condenser inlet is saturated vapor. The second electronic expansion valve enables heat exchange between the first heat exchanger and the condenser through the heat exchange medium.

[0058] It is understandable that if Figure 1 As shown, the HVAC circuit also includes a first three-way valve 191 and a second heat exchanger 102. The input of the first three-way valve is connected to the first end of the heater core; the first output of the first three-way valve is connected to the second input of the second heat exchanger, and the second output of the first three-way valve is connected to the first input of the four-way valve; the second input of the four-way valve is connected to the second output of the second heat exchanger, and the second output of the four-way valve is connected to the second liquid storage tank 232. In this embodiment of the present application, opening the first three-way valve allows the coolant to circulate within the HVAC circuit or flow through the second heat exchanger to exchange heat with other circuits via a heat exchange medium.

[0059] It is understandable that if Figure 1As shown, the motor thermal management circuit also includes a second three-way valve 192 and a third three-way valve 193. The input end of the second three-way valve is connected to the output end of the motor; the first output end of the second three-way valve is connected to the input end of the radiator, and the second output end of the second three-way valve is connected to the input end of the third three-way valve; the first output end of the third three-way valve is connected to the input end of the first water pump; and the second output end of the third three-way valve is connected to the fourth input end of the second heat exchanger. When the second three-way valve of this embodiment is opened, the water can be selected to flow through the radiator when the motor needs to dissipate heat, or to flow through the non-radiator circuit when the motor does not need to dissipate heat. When the third three-way valve of this embodiment is opened, the water can be selected to flow through the self-circulation circuit when the motor does not need to release heat, or to flow through the second heat exchanger when the motor needs to release heat.

[0060] In this embodiment of the present application, the second heat exchanger has eight heat exchange channels, connecting the heat pump air conditioning circuit, the motor thermal management circuit, the HVAC circuit, and the battery thermal management circuit. Specifically, the heat pump air conditioning circuit implemented by channels 1 and 2 can absorb heat from the second heat exchanger during the refrigeration cycle; the motor thermal management circuit implemented by channels 3 and 4 can release excess heat to the second heat exchanger for use by other circuits, thus achieving waste heat utilization; the HVAC circuit implemented by channels 5 and 6 can absorb heat from the second heat exchanger during winter heating to heat the passenger compartment; and the battery thermal management circuit implemented by channels 7 and 8 can release heat through the second heat exchanger in summer and absorb heat through the second heat exchanger in winter.

[0061] Based on the structural relationship of the above-mentioned integrated thermal management system for heavy-duty trucks, the embodiments of the present application can implement the following working modes:

[0062] (1) The working mode of passenger compartment thermal management: The working mode of passenger compartment thermal management is divided into heat pump air conditioning cooling, second heat exchanger heating, heat pump air conditioning heating and PTC heater heating. amb Indicates the ambient temperature, T ambhigh Indicates the upper limit of the set ambient temperature, T ambmlow Indicates the lower limit of the set ambient temperature, T cab Indicates the cabin temperature, T cabhigh Indicates the upper limit of the passenger compartment temperature, T cablow Indicates the lower limit value of the passenger compartment temperature.

[0063] In heat pump air conditioning cooling: when T amb >T ambhigh , T cab >T cabhigh At this time, the passenger compartment temperature is high and needs to be cooled; the heat pump is switched to the cooling position, the first solenoid valve is opened, and the second solenoid valve is closed. In this process, the thermal management system performs heat pump air conditioning to cool the passenger compartment.

[0064] When heating in the second heat exchanger: When T amb <T ambmlow , T cab <T cablow The second heat exchanger receives waste heat from the motor, which is then exchanged with the HVAC circuit. If the passenger compartment is cold and requires heating, the four-way valves are used to adjust the heat exchange circuit: the first three-way valve is set to the heat exchange circuit, the third three-way valve is set to the heat exchange circuit, and the second three-way valve is set to the motor self-circulation circuit. In low-temperature environments, the waste heat generated by the motor is used to heat the passenger compartment, achieving efficient energy utilization. This process heats the passenger compartment through the second heat exchanger.

[0065] When the heat pump air conditioner is heating: When T amb <T amblow , T cab <T cablow When the second heat exchanger is free of motor waste heat input, the passenger compartment is cold and requires heating. The heat pump air conditioner is set to the heating position, opening the second electronic expansion valve and the second solenoid valve, while the first and third electronic expansion valves are closed. In low-temperature environments, when the second heat exchanger is free of motor waste heat input, the passenger compartment is heated by the heat pump air conditioner. This process utilizes the heat pump air conditioner to heat the passenger compartment.

[0066] When the PTC heater is heating: When T amb <T amblow , T cab <T cablow When the ambient temperature is low and the heat pump air conditioner cannot operate efficiently and provide sufficient heat, the passenger compartment temperature is low and needs to be heated. The first three-way valve opens the self-circulating circuit, and the four-way valve opens the self-circulating circuit. The passenger compartment is heated by the PTC heater in the HVAC circuit. In this process, the thermal management system heats the passenger compartment using the PTC heater.

[0067] (2) Battery thermal management working mode: The battery thermal management working mode is divided into heat pump air conditioning cooling, second heat exchanger heating, heat pump air conditioning heating and PTC heater heating. bat Indicates the battery temperature, T bathigh Indicates the upper limit of battery temperature, T batlow Indicates the lower limit value of the battery temperature.

[0068] In heat pump air conditioning cooling: when T bat >T bathigh At this point, the power battery is at a high temperature and needs cooling. The heat pump is set to the cooling position, the third electronic expansion valve is opened, and the second solenoid valve is closed. This process uses the heat pump to cool the battery.

[0069] When heating in the second heat exchanger: When T amb <T ambmlow , T bat <T batlow The second heat exchanger receives waste heat from the motor, which is then exchanged with the battery thermal management circuit. In low-temperature environments, the motor's waste heat is used to heat the battery, achieving efficient energy utilization. This process heats the battery through the second heat exchanger.

[0070] When the heat pump air conditioner is heating: When T bat <T batlow At this time, the battery temperature is low and requires heating, which requires a heat pump air conditioner. Set the heat pump air conditioner to the heating position, open the second electronic expansion valve, open the second solenoid valve, close the first solenoid valve and the third electronic expansion valve, open the four-way valve in the heat exchange direction, and open the three-way valve in the heat transfer direction. In low-temperature environments, when there is no waste heat input from the motor to the second heat exchanger, the heat pump air conditioner heats the battery. This process uses the heat pump air conditioner to heat the battery.

[0071] When the PTC heater is heating: When T amb <T amblow , T bat <T batlow The ambient temperature is low, so the heat pump air conditioner cannot operate efficiently and provide sufficient heat. The battery temperature is low and needs to be heated. The first three-way valve opens in the heat transfer direction, and the four-way valve opens in the heat transfer direction. The battery is heated by the PTC heater in the HVAC circuit. During this process, the thermal management system heats the battery using the PTC heater.

[0072] (3) Working mode of motor thermal management: The working mode of motor thermal management is divided into motor circuit insulation cycle, radiator heat dissipation, heat pump air conditioning refrigeration and second heat exchanger heat exchange. Among them, T mot Indicates the motor temperature, T mothigh Indicates the upper limit of the motor temperature, T motfluid Indicates the water temperature of the motor circuit, T cabinfluid Indicates the water temperature of the passenger compartment HVAC circuit, T batfluid Indicates the battery circuit water temperature.

[0073] During the motor circuit insulation cycle: When T mot <T mothigh At this point, the motor temperature is within the ideal operating temperature range; the second three-way valve opens the self-circulating loop. During this process, the motor circuit achieves thermal insulation circulation.

[0074] When the heat sink is cooling: when T mot >T mothighAt this time, the motor temperature is high and needs to be cooled. The heat that needs to be dissipated from the motor is dissipated through the radiator. The second three-way valve opens the heat dissipation circuit. In this process, the thermal management system dissipates heat from the motor through the radiator.

[0075] In heat pump air conditioning cooling: when T mot >T mothigh At this point, the motor temperature is high and needs cooling. When using the radiator to dissipate heat, it reaches its maximum power and is insufficient to dissipate sufficient heat. Therefore, a heat pump air conditioner is needed to cool the motor. The third three-way valve opens the heat exchange circuit, switching the heat pump to the cooling position. This opens the first solenoid valve, closes the second solenoid valve, and opens the third electronic expansion valve. The heat pump air conditioner then cools the motor through the heat exchanger. In this process, the thermal management system provides heat pump air conditioning for the motor.

[0076] During heat exchange in the second heat exchanger:

[0077] ① When T motfluid >T cabinfluid At this point, the motor circuit water temperature is higher than the HVAC circuit water temperature. Since heavy truck motors generate a large amount of heat, effectively utilizing this waste heat can significantly improve the system's energy efficiency and increase driving range. The third three-way valve opens the heat exchange circuit, the four-way valve opens in the heat exchange direction, and the first three-way valve opens in the heat exchange direction. This allows the motor circuit and the HVAC circuit to effectively exchange heat in the second heat exchanger, providing the motor's waste heat to the passenger compartment.

[0078] ②When T motfluid >T batfluid At this time, the water temperature of the motor circuit is higher than that of the battery circuit; the third three-way valve opens the heat exchange circuit, so that the motor circuit and the battery circuit can effectively exchange heat in the second heat exchanger, and the waste heat of the motor is provided to the battery.

[0079] ③ When the heat pump air conditioner is turned on to the heating position, the third three-way valve is opened, and the motor releases the waste heat to the second heat exchanger. After the refrigerant releases heat in the first heat exchanger, it passes through the third electronic expansion valve and can absorb heat in the second heat exchanger, so that the heat pump absorbs heat from the waste heat of the motor, improves the heating effect of the heat pump air conditioner, and reduces system energy consumption.

[0080] During heat exchange in the second heat exchanger:

[0081] (1) Passenger compartment heat pump air conditioning heating: When the passenger compartment is heated by heat pump air conditioning, the compressor duty cycle and the third water pump speed signals will be coordinated and dynamically adjusted according to the temperature difference between the set passenger compartment air outlet temperature and the actual air outlet temperature. The HVAC circuit fan speed will be dynamically adjusted according to the set passenger compartment temperature and the actual passenger compartment temperature.

[0082] (2) Battery heat pump air conditioning heating: When the battery is heated by heat pump air conditioning, the three signals of compressor duty cycle, third water pump speed and second water pump speed will be coordinated and dynamically adjusted according to the temperature difference between the set battery temperature and the actual battery temperature.

[0083] (3) Both the battery and the passenger compartment require heat pump air conditioning heating: When both the battery and the passenger compartment are heated by heat pump air conditioning, the three signals of the compressor duty cycle, the third water pump speed, and the second water pump speed will be dynamically adjusted according to the two variables of the temperature difference between the set passenger compartment air outlet temperature and the actual air outlet temperature and the temperature difference between the set battery temperature and the actual battery temperature. The HVAC circuit fan speed is dynamically adjusted according to the set passenger compartment temperature and the actual passenger compartment temperature.

[0084] From the above content, it can be seen that the system of the embodiment of the present application couples multiple circuits by setting a multi-media heat exchanger as the second heat exchanger, and adopts R134a as the AC refrigerant. After adopting 50% ethylene glycol aqueous solution as the system coolant, it reduces energy waste and improves the energy utilization efficiency of the entire vehicle by recycling the waste heat of the motor. The recovery of waste heat helps to maintain the motor operating within the optimal temperature range and extend the service life of the motor. By utilizing the waste heat of the multi-media heat exchanger, heavy-duty new energy vehicles can not only improve overall energy efficiency and reduce energy waste, but also optimize the performance of the thermal management system and reduce operating costs. At the same time, this integrated thermal management solution can also simplify the system structure, reduce the weight and space occupied by the vehicle, and provide more possibilities for vehicle design and performance improvement.

[0085] The embodiments described in the embodiments of this application are intended to more clearly illustrate the technical solutions of the embodiments of this application and do not constitute a limitation on the technical solutions provided by the embodiments of this application. Those skilled in the art will appreciate that with the evolution of technology and the emergence of new application scenarios, the technical solutions provided in the embodiments of this application are also applicable to similar technical problems.

[0086] Those skilled in the art will understand that the technical solutions shown in the figures do not constitute a limitation on the embodiments of the present application, and may include more or fewer steps than shown in the figures, or a combination of certain steps, or different steps.

[0087] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, i.e., they may be located in one place or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of this embodiment.

[0088] Those skilled in the art will appreciate that all or some of the steps in the methods, systems, and functional modules / units in the devices disclosed above may be implemented as software, firmware, hardware, or appropriate combinations thereof.

[0089] The terms "first", "second", "third", "fourth", etc. (if any) in the specification of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0090] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the above-mentioned units is only a logical function division. In actual implementation, there may be other division methods, such as 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.

[0091] The units described above as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0092] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0093] The preferred embodiments of the present invention are described above with reference to the accompanying drawings, but are not intended to limit the scope of the present invention. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and essence of the present invention should be within the scope of the present invention.

Claims

1. A heavy-duty truck integrated thermal management system, characterized in that: The system includes a heat pump air conditioning circuit, a battery thermal management circuit, a HVAC circuit, and a motor thermal management circuit; The heat pump air conditioning circuit, the battery thermal management circuit, the HVAC circuit and the motor thermal management circuit are coupled via a second heat exchanger; the second heat exchanger is a multi-media heat exchanger; The heat pump air conditioning circuit performs heat exchange through refrigerant, the ventilation circuit performs heat exchange through coolant, and the battery thermal management circuit and the motor thermal management circuit both perform heat exchange through water.

2. The system according to claim 1, wherein: The heat pump air conditioning circuit includes a condenser, an evaporator, a first heater, the second heat exchanger and a compressor; The input end of the condenser is connected to the first output end of the first gas heater, and the output end of the condenser is respectively connected to the input end of the evaporator, the first input end of the second heat exchanger, and the input end of the compressor; The output end of the evaporator is connected to the input end of the compressor; The first output end of the second heat exchanger is connected to the input end of the compressor; The output end of the compressor is connected to the first input end of the first gas heater.

3. The system according to claim 1, wherein: The HVAC circuit includes a heater core, a heater, the first heat exchanger, a four-way valve and a third water pump; The first end of the heater core is connected to the first input end of the four-way valve, and the second end of the heater core is connected to the first end of the heater; The input end of the third water pump is connected to the first output end of the four-way valve; The output end of the third water pump is connected to the second input end of the first heat exchanger; The second output end of the first heat exchanger is connected to the second end of the heater.

4. The system according to claim 3, characterized in that The HVAC circuit further includes a first three-way valve and the second heat exchanger; The input end of the first three-way valve is connected to the first end of the heater core; The first output end of the first three-way valve is connected to the second input end of the second heat exchanger, and the second output end of the first three-way valve is connected to the first input end of the four-way valve; The second input end of the four-way valve is connected to the second output end of the second heat exchanger, and the second output end of the four-way valve is connected to the second liquid storage tank.

5. The system according to claim 1, wherein: The battery thermal management circuit includes a battery, the second heat exchanger and a second water pump; The output end of the battery is connected to the third input end of the second heat exchanger; The third output end of the second heat exchanger is connected to the input end of the second water pump; The output end of the water pump is connected to the input end of the battery.

6. The system according to claim 1, wherein: The motor thermal management circuit includes a motor, a radiator, a first water pump and the second heat exchanger; The fourth output end of the second heat exchanger is connected to the input end of the first water pump; The output end of the first water pump is connected to the input end of the motor; The output end of the motor is connected to the input end of the radiator; The output end of the radiator is connected to the fourth input end of the second heat exchanger.

7. The system according to claim 2, wherein: The input end of the compressor is also provided with a vapor-liquid separator.

8. The system according to claim 7, characterized in that A first electromagnetic valve is provided between the output end of the condenser and the input end of the evaporator; and a second electromagnetic valve is provided between the condenser and the input end of the vapor-liquid separator.

9. The system according to claim 8, characterized in that A first electronic expansion valve is provided between the output end of the first solenoid valve and the input end of the evaporator; a second electronic expansion valve is provided between the first output end of the first heat exchanger and the input end of the condenser.

10. The system according to claim 6, wherein: The motor thermal management circuit also includes a second three-way valve and a third three-way valve; The input end of the second three-way valve is connected to the output end of the motor; the first output end of the second three-way valve is connected to the input end of the radiator, and the second output end of the second three-way valve is connected to the input end of the third three-way valve; The first output end of the third three-way valve is connected to the input end of the first water pump; the second output end of the third three-way valve is connected to the fourth input end of the second heat exchanger.

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