A vehicle thermal management system based on double-oil-path cooperation

Abstract

The utility model provides a kind of vehicle thermal management system based on double oil path cooperation, the system includes motor oil path, gearbox oil path, first heat exchanger;Wherein, first heat exchanger connects motor oil path and gearbox oil path, for realizing the heat exchange between motor oil path and gearbox oil path.The utility model can realize the heat cooperative management between motor system and gearbox system, solve the problem such as low energy efficiency, poor operating condition adaptability caused by motor and gearbox heat independent emission in traditional electric drive system.

Description

Technical Field

[0001] This utility model relates to the field of cooling and lubrication technology, and in particular to a vehicle thermal management system based on dual oil circuit coordination. Background Technology

[0002] Currently, electric drive axle cooling systems generally adopt a technical solution with independent cooling designs for the motor and gearbox. In this design, the motor cooling circuit typically uses an oil-water heat exchanger (i.e., an oil cooler), where the lubricating oil is circulated by the motor oil pump, transferring heat to the cooling water system (such as a low-temperature water tank or radiator), and ultimately relying on external cooling media for heat dissipation. The gearbox cooling circuit, on the other hand, uses an independent oil cooling cycle, where the oil is driven by the gearbox oil pump to flow through the gearbox, and the heat is directly dissipated through the gearbox housing or external heat sinks (air cooling), with no heat exchange between the gearbox and motor cooling systems.

[0003] This traditional technical architecture has significant limitations in thermal management. First, the motor and transmission oil circuits are completely isolated, and heat is only dissipated through external cooling media (water or air), lacking a thermal energy coordination mechanism between subsystems. Second, the cooling path is singular: the motor oil circuit relies on an oil-water heat exchanger, and the transmission oil circuit relies on air cooling (some electric drive axles use the same oil-water heat exchanger as the motor), making it impossible to dynamically adjust heat distribution according to operating conditions.

[0004] Therefore, there is an urgent need for a new vehicle thermal management system based on dual oil circuit coordination that can solve the above problems, realize the coordinated management of heat between the motor and the transmission, simplify the design of the cooling water circuit, and improve the overall energy efficiency and reliability of the system. Utility Model Content

[0005] This utility model discloses a vehicle thermal management system and vehicle based on dual oil circuit coordination, aiming to solve the technical problems existing in the prior art.

[0006] The present invention adopts the following technical solution:

[0007] In a first aspect, embodiments of this utility model provide a vehicle thermal management system based on dual-oil circuit coordination, comprising:

[0008] The motor oil circuit is used to provide cooling and lubrication for the motor;

[0009] The transmission fluid circuit is used for cooling and lubricating the transmission;

[0010] The first heat exchanger connects the motor oil circuit and the gearbox oil circuit, and is used to realize heat exchange between the motor oil circuit and the gearbox oil circuit.

[0011] As a preferred technical solution, a second heat exchanger is also included, which is connected to both the motor oil circuit and the vehicle cooling water circuit, and is used to transfer the heat from the motor oil circuit to the vehicle cooling water circuit.

[0012] As a preferred technical solution, the oil in the motor oil circuit flows sequentially through the first heat exchanger and the second heat exchanger before flowing to the motor. The motor oil circuit includes a motor oil pump, a motor filter, and a motor cooling assembly.

[0013] The motor oil pump is used to drive the oil circulation in the motor oil circuit. The motor filter is located between the output end of the motor oil pump and the input end of the first heat exchanger. The motor cooling assembly is located between the output end of the second heat exchanger and the input end of the motor oil pump.

[0014] As a preferred technical solution, the oil in the transmission oil circuit flows to the transmission after passing through the first heat exchanger. The transmission oil circuit includes a transmission oil pump, a transmission filter, and a gearbox cooling assembly.

[0015] The transmission oil pump is used to drive the circulation of oil in the transmission oil circuit and is connected to the inlet end of the first heat exchanger. The gearbox cooling assembly is located at the output end of the first heat exchanger, and the transmission filter is located at the output end of the gearbox cooling assembly.

[0016] As a preferred technical solution, the first heat exchanger includes an oil-oil heat exchanger, which has two isolated oil channels inside, and a heat conduction structure is provided between the two oil channels.

[0017] As a preferred technical solution, the first heat exchanger is configured to transfer part of the heat in the motor oil circuit to the transmission oil circuit when the oil temperature in the motor oil circuit is higher than that in the transmission oil circuit under high motor load conditions, so as to reduce the motor oil temperature and increase the transmission oil temperature.

[0018] As a preferred technical solution, the first heat exchanger is configured such that, under high load conditions of the transmission, when the oil temperature in the transmission oil circuit is higher than the oil temperature in the motor oil circuit, part of the heat in the transmission oil circuit is transferred to the motor oil circuit, and the heat is then transferred to the vehicle cooling water circuit via the second heat exchanger.

[0019] As a preferred technical solution, the second heat exchanger includes an oil-water heat exchanger, which has an oil channel and a water channel inside, and a heat conduction structure is provided between the oil channel and the water channel.

[0020] As a preferred technical solution, the vehicle's water system is also equipped with a water pump with adjustable speed to adjust the heat exchange efficiency with the second heat exchanger.

[0021] As a preferred technical solution, the vehicle cooling water circuit is provided with only one heat exchange interface connected to the motor oil circuit. The heat exchange interface realizes the heat exchange between the vehicle cooling water circuit and the motor oil circuit through a second heat exchanger, and indirectly realizes the heat exchange between the vehicle cooling water circuit and the transmission oil circuit through the series structure of the first heat exchanger and the second heat exchanger.

[0022] Secondly, embodiments of the present invention provide a vehicle including a vehicle thermal management system based on dual oil circuit coordination as described in any of the preceding claims.

[0023] One embodiment of the above-described utility model has the following advantages or beneficial effects:

[0024] The vehicle thermal management system based on dual oil circuit coordination provided by this utility model realizes the coordinated heat management between the motor system and the transmission system by setting a first heat exchanger between the motor oil circuit and the transmission oil circuit. This solves the problems of low energy efficiency and poor adaptability to operating conditions caused by the independent heat dissipation of the motor and transmission in traditional electric drive systems.

[0025] Under high motor load conditions, the system uses the first heat exchanger to transfer part of the heat in the motor oil circuit to the transmission oil circuit. This effectively reduces the motor oil temperature and also uses this heat to raise the transmission oil temperature, reducing the extra energy consumption required for transmission preheating in low-temperature environments. Under high transmission load conditions, the system can transfer part of the heat in the transmission oil circuit to the motor oil circuit through the first heat exchanger, and then to the vehicle cooling water circuit through the second heat exchanger. This effectively prevents the transmission oil temperature from exceeding the safety limit, avoids the bottleneck of a single heat dissipation path, reduces dependence on external cooling, and improves the overall system energy efficiency by 15%-20%.

[0026] Regarding adaptability to different operating conditions, this invention provides stable temperature control for the electric drive system under all operating conditions by adjusting the direction of heat transfer between the motor oil circuit and the transmission oil circuit. In low-temperature environments, the heat from the motor oil circuit can be used to raise the transmission oil temperature, improving the transmission lubrication efficiency and reducing transmission resistance losses caused by viscosity. At the same time, the heat dissipation efficiency of the hot zone of the motor oil can be improved by about 10%. In high-temperature environments / high-load conditions, by increasing the speed of the motor oil pump, the first heat exchanger can quickly dissipate the heat from the transmission, achieving stable temperature control under all operating conditions.

[0027] Furthermore, this utility model's vehicle thermal management system based on dual oil circuit coordination simplifies the overall vehicle cooling water circuit design, requiring only one interface for a second heat exchanger. Compared to traditional solutions, this reduces the number of water circuit interfaces from 2-3 to 1, shortening the overall length of the vehicle's water circuit, reducing water flow resistance and pressure drop, and lowering the power requirements of the water pump. Heat from the transmission can be transferred to the vehicle's cooling water circuit via the motor oil circuit, without consuming valuable water resources. The system flow distribution is simplified to single-path control, eliminating the need for complex valve adjustments, reducing water circuit interfaces, connectors, and auxiliary pipelines, lowering component costs, and freeing up internal space in the electric drive system through a compact layout, facilitating the design and application of highly integrated vehicle models.

[0028] In summary, the vehicle thermal management system based on dual oil circuit coordination provided by this utility model not only improves the overall energy efficiency of the system by realizing the coordinated management of heat between the motor and the transmission, but also enables the electric drive system to maintain a good working state under different operating conditions. At the same time, it simplifies the design of the vehicle cooling system and reduces system complexity and energy consumption. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below, forming part of this utility model. The illustrative embodiments of this utility model and their descriptions explain this utility model and do not constitute an improper limitation of this utility model. In the accompanying drawings:

[0030] Figure 1 This is a schematic diagram of the structure of a vehicle thermal management system based on dual oil circuit coordination provided in a preferred embodiment of Embodiment 1 of this utility model.

[0031] Explanation of reference numerals in the attached figures:

[0032] 11. Motor oil pump, 12. Motor filter, 13. First heat exchanger, 14. Second heat exchanger, 15. Motor cooling assembly, 16. Transmission filter, 17. Transmission oil pump, 18. Gearbox cooling assembly, 19. Vehicle cooling water circuit. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. In the description of this utility model, it should be noted that the term "or" is generally used to include the meaning of "and / or," unless otherwise expressly stated otherwise.

[0034] In the description of this application, the terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance. In the embodiments, "system" refers to "vehicle thermal management system based on dual oil circuit coordination."

[0035] Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0036] Example 1

[0037] Existing electric drive axle cooling systems have several problems. First, they are inefficient and wasteful of energy. The heat from the high-temperature motor oil cannot be recovered and utilized by the transmission oil circuit, and the system must rely entirely on an external cooling system for heat dissipation, resulting in high energy consumption. Second, the system has poor adaptability to extreme operating conditions. In low-temperature environments, the transmission oil viscosity is too high, requiring an additional electric heating device for preheating, with traditional solutions consuming 500W-1kW. Furthermore, under high-load conditions, the gearbox oil temperature can easily exceed safety limits.

[0038] A more prominent issue is the distribution of water flow and energy consumption in the vehicle's cooling system. Traditional electric drive axles, if using oil-water heat exchangers for both the motor and transmission, require a separate vehicle-wide water circuit interface for each heat exchanger. For single-motor models, this requires two interfaces; for dual-motor models, three; and for 6x4 models, potentially six. This multi-interface design leads to more water circuit branches, increased total pipe length, and a significant increase in water flow resistance (pressure drop). This forces the water pump to increase its power to maintain flow, resulting in increased energy consumption, with the liquid cooling system's power consumption increasing by an additional 8%-12%. Meanwhile, the transmission oil temperature is typically stable at 60-80℃ (lower than the motor oil temperature of 90-110℃), requiring less cooling water flow for its corresponding oil-water heat exchanger. However, in traditional designs, the transmission water circuit needs to be independently allocated a fixed flow rate, leading to redundant and wasted flow, and requiring complex valves or distributors, making flow control difficult.

[0039] To address the aforementioned problems, this utility model provides a vehicle thermal management system based on dual-oil circuit coordination, such as... Figure 1 Preferably, the system includes an electric motor oil circuit, a transmission oil circuit, a first heat exchanger 13, and a second heat exchanger 14. The electric motor oil circuit provides cooling and lubrication for the electric motor; the transmission oil circuit provides cooling and lubrication for the transmission; the first heat exchanger 13 connects the electric motor oil circuit and the transmission oil circuit to achieve heat exchange between them; one end of the second heat exchanger 14 is connected to the electric motor oil circuit, and the other end is connected to the vehicle's cooling water circuit to transfer heat from the electric motor oil circuit to the vehicle's cooling water circuit; the oil in the electric motor oil circuit flows sequentially through the first heat exchanger 13 and the second heat exchanger 14 before flowing to the electric motor, and the oil in the transmission oil circuit flows through the first heat exchanger 13 before flowing to the transmission.

[0040] Specifically, the vehicle thermal management system based on dual oil circuit coordination of this utility model is applicable to electric drive systems (i.e., electric drive axles), which include at least a motor and a gearbox. The motor, as the power source of the electric drive system, generates a large amount of heat during operation; the gearbox, as the transmission device of the electric drive system, also generates a certain amount of heat under high load conditions. To ensure the normal operation of the electric drive system, effective cooling and lubrication of the motor and gearbox are necessary.

[0041] In a preferred embodiment, an electric motor oil pump 11 is provided in the electric motor oil circuit, and a transmission oil pump is provided in the transmission oil circuit. When the vehicle thermal management system based on dual oil circuit coordination in this embodiment of the invention is used in conjunction with the electric drive system, the oil in the electric motor oil circuit is driven to circulate by the electric motor oil pump 11, passing sequentially through the first heat exchanger 13 and the second heat exchanger 14 before entering the electric motor to cool and lubricate it; the oil in the transmission oil circuit is driven to circulate by the transmission oil pump 17, passing through the first heat exchanger 13 before entering the transmission to cool and lubricate it. The first heat exchanger 13 facilitates heat exchange between the electric motor oil circuit and the transmission oil circuit, and the second heat exchanger 14 facilitates heat exchange between the electric motor oil circuit and the vehicle cooling water circuit 19.

[0042] Specifically, the electric drive system generates different heat loads under different operating conditions. Under high motor load conditions, the oil temperature in the motor oil circuit will rise significantly. At this time, the first heat exchanger 13 can transfer some of the heat to the transmission oil circuit, while the second heat exchanger 14 can transfer the remaining heat to the vehicle cooling water circuit 19. Under high transmission load conditions, the oil temperature in the transmission oil circuit will rise significantly. At this time, the first heat exchanger 13 can transfer some of the heat to the motor oil circuit, and then the second heat exchanger 14 will finally transfer it to the vehicle cooling water circuit 19.

[0043] In this embodiment, the structural form of each component in the electric drive system is not specifically limited. Those skilled in the art can select and adjust accordingly based on the specific vehicle model and actual application scenario.

[0044] In a preferred embodiment, in addition to the motor oil pump 11, the motor oil circuit also includes a motor filter 12 and a motor cooling assembly 15. The motor filter 12 is disposed between the output end of the motor oil pump 11 and the input end of the first heat exchanger 13, and is used to filter impurities and metal particles in the motor oil circuit to ensure the cleanliness of the oil flowing to the first heat exchanger 13 and the second heat exchanger 14. At the same time, since the oil output by the motor oil pump 11 has a high pressure, it is beneficial for the oil to pass through the filter, thereby improving the filtration efficiency. The motor cooling assembly 15 is disposed between the output end of the second heat exchanger 14 and the input end of the motor oil pump 11. It is in direct contact with the motor and achieves cooling and lubrication of the motor through the flow of lubricating oil, absorbing the heat generated by the motor during operation.

[0045] Specifically, the motor cooling assembly 15 can take various forms, such as cooling oil channels surrounding the outer wall of the motor stator, an oil cavity structure inside the motor, or a nozzle system for spraying lubricating oil. When the lubricating oil flows through these structures, it can effectively absorb the heat generated by the motor during high-speed operation, while providing lubrication to rotating parts such as motor bearings, reducing frictional losses, and extending the service life of the motor.

[0046] In a preferred embodiment, in addition to the transmission oil pump 17, the transmission oil circuit also includes a transmission filter 16 and a gearbox cooling assembly 18. The gearbox cooling assembly 18 is located at the output end of the first heat exchanger 13 and directly contacts the gear assembly inside the transmission, achieving cooling and lubrication of the transmission and absorbing the heat generated during operation. The transmission filter 16 is located at the output end of the gearbox cooling assembly 18. Specifically, since the gearbox cooling assembly 18 directly contacts the gear assembly inside the transmission, during transmission operation, the meshing friction between gears generates metal shavings and impurities. Placing the filter after the gearbox cooling assembly 18 effectively filters out these impurities, preventing them from re-entering the circulation system and protecting the transmission oil pump 17 and the first heat exchanger 13 from damage, thereby extending the service life of the system components.

[0047] Specifically, the gearbox cooling assembly 18 can take various forms, such as an oil passage network inside the gearbox, a nozzle system for directional oil spraying at the gear meshing points, or an oil-immersed cooling chamber. When the lubricating oil flows through these structures, it can not only carry away the heat generated during gear meshing, but also form an oil film to reduce direct contact between gears, thereby reducing friction and wear and extending the service life of the gearbox.

[0048] In this embodiment, the specific structure, size, and arrangement of the motor cooling assembly 15 and the gearbox cooling assembly 18 can be designed and adjusted according to the specific model, power, and operating characteristics of the motor and gearbox, and are not specifically limited in this embodiment. Those skilled in the art can select a suitable cooling assembly structure according to actual application requirements to achieve optimal cooling and lubrication effects.

[0049] Preferably, the first heat exchanger 13 is an oil-to-oil heat exchanger, which has two isolated oil channels inside. One channel is used for the oil flow in the motor oil circuit, and the other channel is used for the oil flow in the gearbox oil circuit. The isolation of the two oil channels can ensure that the oil in the two oil circuits will not mix directly, avoiding compatibility problems that may exist between different types of lubricating oils, while maintaining the independence and sealing of each oil circuit.

[0050] Specifically, the heat conduction structure is typically made of materials with good thermal conductivity, such as aluminum alloys or copper alloys, to improve heat exchange efficiency. This structure can also take various forms, such as plate heat exchange structures or shell-and-tube heat exchange structures, etc., and is not specifically limited in this embodiment. When the motor oil circuit temperature is higher than the gearbox oil circuit temperature, heat is transferred from the motor oil circuit to the gearbox oil circuit through this heat conduction structure; conversely, when the gearbox oil circuit temperature is higher than the motor oil circuit temperature, heat is transferred from the gearbox oil circuit to the motor oil circuit through this heat conduction structure.

[0051] Preferably, the second heat exchanger 14 includes an oil-water heat exchanger, which has an oil passage and a water passage inside. The oil passage is connected to the motor oil circuit for the flow of oil in the motor oil circuit, and the water passage is connected to the vehicle cooling water circuit 19 for the flow of coolant in the vehicle cooling water circuit 19. A heat conduction structure is provided between the oil passage and the water passage to promote the transfer of heat from the oil to the coolant or from the coolant to the oil.

[0052] Specifically, the heat conduction structure in the second heat exchanger 14 may be the same as or different from the heat conduction structure in the first heat exchanger 13, and this embodiment will not be specifically limited.

[0053] Furthermore, the heat transfer efficiency of the first heat exchanger 13 and the second heat exchanger 14 can be optimized by adjusting factors such as the shape, size, material, and flow channel arrangement of the heat transfer structure to meet the heat transfer requirements under different operating conditions. Those skilled in the art can select appropriate heat exchanger structures and parameters according to the actual application scenario to achieve the best heat exchange effect.

[0054] In a preferred embodiment, the main function of the vehicle cooling water circuit 19 is to transfer heat generated by the electric drive system and other heat sources to the radiator, and then dissipate the heat to the environment through the radiator. Optionally, its structure includes a water pump, a radiator, an expansion tank, a temperature control valve, and pipes connecting the various components. In this embodiment, the design parameters of the vehicle cooling water circuit 19, such as pipe diameter, water pump flow rate, and radiator heat dissipation area, should be matched with the thermal management requirements of the electric drive system. This embodiment does not specifically limit the specific structure and parameters of the vehicle cooling water circuit 19. Those skilled in the art can appropriately design and adjust the vehicle cooling water circuit 19 according to the overall design requirements of the vehicle thermal management system to achieve optimal cooling effect and energy utilization efficiency.

[0055] With the vehicle thermal management system based on dual oil circuit coordination of this utility model, the vehicle cooling water circuit 19 only needs to exchange heat with the motor oil circuit, without directly connecting to the transmission oil circuit. This simplifies the design complexity of the vehicle cooling water circuit 19, reduces water circuit interfaces and connecting pipes, and lowers system cost and flow resistance.

[0056] In a preferred embodiment, the vehicle thermal management system based on dual oil circuit coordination provided by this utility model can be configured with two working modes, forward mode and reverse mode, according to different working conditions, to realize bidirectional heat transfer between the motor oil circuit and the transmission oil circuit, and achieve the effect of dynamic thermal balance.

[0057] Preferably, when the motor is under high load or the vehicle is in a low temperature environment, and the oil temperature in the motor oil circuit is higher than the oil temperature in the transmission oil circuit, the system is in the forward mode. At this time, heat is naturally transferred from the motor oil circuit to the transmission oil circuit through the first heat exchanger 13. The first heat exchanger 13 is used to transfer part of the heat in the motor oil circuit to the transmission oil circuit. On the one hand, it can reduce the motor oil temperature and prevent the motor from overheating. On the other hand, it can heat the transmission oil, thereby reducing cold start friction loss.

[0058] Specifically, under low-temperature starting conditions of new energy heavy trucks, especially in cold start conditions in winter, the gearbox temperature is often maintained at around 40°C. At this time, the viscosity of the gearbox oil is high, which will lead to increased transmission resistance and power consumption of up to 2 kWh / km. The gearbox oil heated by the above-mentioned positive mode can reduce transmission resistance and improve driving range.

[0059] Preferably, when the transmission is under high load and the oil temperature in the transmission oil circuit is higher than the oil temperature in the motor oil circuit, the system is in reverse mode. At this time, heat is naturally transferred from the transmission oil circuit to the motor oil circuit through the first heat exchanger 13, and then the heat is transferred to the vehicle cooling water circuit 19 through the second heat exchanger 14.

[0060] Specifically, in reverse mode, the transmission oil temperature may become too high under high temperature environments or continuous high load conditions (such as climbing hills or high-speed driving). In this case, the high-temperature transmission oil can transfer some of its heat to the motor oil circuit through the first heat exchanger 13. After receiving the heat, the motor oil circuit increases the speed of the motor oil pump 11 to improve the oil-water heat exchange efficiency, transferring the heat to the vehicle's cooling water circuit 19 system for discharge, forming a multi-stage heat dissipation path. This reverse heat transfer mode can effectively prevent damage caused by excessive transmission oil temperature, while utilizing the heat dissipation capacity of the vehicle's cooling water circuit 19, thus improving the overall thermal management efficiency of the system.

[0061] In this embodiment, by setting the first heat exchanger 13, the thermal isolation between the motor system and the gearbox system is broken. Through bidirectional heat transfer and dynamic regulation, the system is transformed from passive heat dissipation to active thermal energy synergy, thereby improving energy efficiency. At the same time, this design also simplifies the system structure, reduces redundant hardware, improves the reliability and maintainability of the system, and enables the entire electric drive system to better adapt to extreme temperatures and complex operating conditions.

[0062] In a preferred embodiment, the switching between forward and reverse modes is achieved by adjusting the speed ratio of the motor oil pump 11, the transmission oil pump 17, and the vehicle cooling water pump 19. For example, in forward mode, even without adjusting the speed of the motor oil pump 11 / transmission oil pump 17, heat can be naturally transferred from the motor oil circuit to the transmission oil circuit through the first heat exchanger 13. In reverse mode, the system increases the speed of the motor oil pump 11 and simultaneously increases the speed of the vehicle cooling water pump 19. At this time, the heat in the transmission oil circuit is accelerated to be transferred to the motor oil circuit first, and then the increased oil-water heat exchange power is improved by the enhanced speed of the motor oil pump 11, and finally the heat is efficiently discharged by the cooling water system, forming a multi-stage heat dissipation path.

[0063] Specifically, this embodiment of the invention effectively solves the problem of adaptability to extreme operating conditions through dynamic heat distribution. In low-temperature environments, the system can utilize the waste heat of the motor to raise the temperature of the transmission oil. Especially when the motor operates in the low-speed, high-torque range, the heat power can reach more than 10% of the transmission's heat power. This heat can be used to increase the temperature of the gearbox oil, reduce its viscosity, and reduce transmission friction loss, thereby improving system efficiency and driving range. Under high-load conditions, the system increases the speed of the motor oil pump 11, accelerates the first heat exchanger 13 to remove heat from the gearbox system, and quickly removes it from the motor system through the second heat exchanger 14, achieving stable control of the operating temperature and preventing the transmission from overheating, which could lead to a decline in oil performance or damage to components.

[0064] Example 2

[0065] This utility model embodiment also provides a vehicle equipped with the vehicle thermal management system based on dual oil circuit coordination described in Embodiment 1. The technical features already included in Embodiment 1 are naturally inherited in this embodiment and will not be repeated.

[0066] Specifically, the vehicles are preferably road vehicles, off-road vehicles, and special vehicles equipped with oil-cooled motors. Road vehicles include passenger cars and commercial vehicles, off-road vehicles include construction machinery vehicles, agricultural machinery vehicles, and mining machinery vehicles, and special vehicles include military vehicles and rescue vehicles.

[0067] In a preferred embodiment, the vehicle is a new energy heavy-duty truck, i.e., a new energy heavy-duty truck. Compared with traditional fuel-powered heavy-duty trucks, new energy heavy-duty trucks face challenges not only in thermal management but also in maximizing energy efficiency to improve driving range. The vehicle thermal management system based on dual-oil circuit coordination described in this embodiment, by realizing bidirectional heat transfer between the motor oil circuit and the transmission oil circuit, is particularly suitable for the application scenarios of new energy heavy-duty trucks.

[0068] In a preferred embodiment, when the new energy heavy truck is operating in a cold region, the motor oil circuit transfers heat to the gearbox oil circuit in a forward mode to accelerate gearbox preheating, reduce frictional losses in the transmission system, and improve system efficiency.

[0069] In a preferred embodiment, under high-load conditions such as long-term uphill climbing or full-load operation of new energy heavy trucks, the gearbox temperature may be too high. At this time, the system transfers the heat in the gearbox oil circuit to the motor oil circuit through the reverse mode, and then discharges it through the vehicle cooling water circuit 19, effectively preventing the gearbox from overheating.

[0070] In a preferred embodiment, the vehicle thermal management system controller based on dual-oil circuit coordination in new energy heavy-duty trucks can interact with other vehicle control systems, such as the battery management system and the vehicle energy management system, to achieve more comprehensive thermal and energy management strategies. For example, when the battery temperature is low and preheating is required, the system can prioritize using the heat generated by the motor for battery preheating rather than transferring it to the transmission; when the battery temperature is too high, the system can prioritize ensuring the heat dissipation efficiency of the battery cooling circuit and appropriately reduce the heat dissipation priority of the motor oil circuit and the transmission oil circuit.

[0071] Although exemplary embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above exemplary embodiments are merely illustrative and are not intended to limit the scope of this application. Various changes and modifications can be made therein by those skilled in the art without departing from the scope and spirit of this application. All such changes and modifications are intended to be included within the scope of this application as claimed in the appended claims.

[0072] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of this application may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0073] Similarly, it should be understood that, in order to streamline this application and aid in understanding one or more of the various aspects of the invention, features of this application may sometimes be grouped together in a single embodiment, figure, or description thereof in the description of exemplary embodiments of this application. However, this approach should not be construed as reflecting an intention that the claimed application requires more features than are expressly recited in each claim. Rather, as reflected in the corresponding claims, its novelty lies in the fact that the corresponding technical problem can be solved with fewer features than all of those in a single disclosed embodiment. Therefore, the claims following the detailed description are hereby expressly incorporated into that detailed description, wherein each claim itself is a separate embodiment of this application.

[0074] Those skilled in the art will understand that, apart from the mutual exclusion of features, all features disclosed in this specification (including the accompanying claims, abstract, and drawings) and all processes or elements of any method or apparatus so disclosed can be combined in any combination. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstract, and drawings) may be replaced by an alternative feature serving the same, equivalent, or similar purpose.

Claims

1. A vehicle thermal management system based on dual-oil circuit coordination, characterized in that, include: The motor oil circuit is used to provide cooling and lubrication for the motor; The transmission fluid circuit is used for cooling and lubricating the transmission; The first heat exchanger connects the motor oil circuit and the gearbox oil circuit, and is used to realize heat exchange between the motor oil circuit and the gearbox oil circuit.

2. The vehicle thermal management system based on dual oil circuit coordination according to claim 1, characterized in that, It also includes a second heat exchanger, which is connected to the motor oil circuit and the vehicle cooling water circuit respectively, and is used to transfer the heat of the motor oil circuit to the vehicle cooling water circuit.

3. The vehicle thermal management system based on dual oil circuit coordination according to claim 2, characterized in that, The oil in the motor oil circuit flows sequentially through the first heat exchanger and the second heat exchanger before flowing to the motor. The motor oil circuit includes a motor oil pump, a motor filter, and a motor cooling assembly. The motor oil pump is used to drive the circulation of oil in the motor oil circuit. The motor filter is located between the output end of the motor oil pump and the input end of the first heat exchanger. The motor cooling assembly is located between the output end of the second heat exchanger and the input end of the motor oil pump.

4. The vehicle thermal management system based on dual oil circuit coordination according to claim 1, characterized in that, The oil in the transmission oil circuit flows through the first heat exchanger and then flows to the transmission. The transmission oil circuit includes a transmission oil pump, a transmission filter, and a gearbox cooling assembly. The transmission oil pump is used to drive the circulation of oil in the transmission oil circuit and is connected to the inlet end of the first heat exchanger. The gearbox cooling assembly is located at the output end of the first heat exchanger, and the transmission filter is located at the output end of the gearbox cooling assembly.

5. The vehicle thermal management system based on dual oil circuit coordination according to claim 1, characterized in that, The first heat exchanger includes an oil-oil heat exchanger, which has two isolated oil channels inside, and a heat conduction structure is provided between the two oil channels.

6. The vehicle thermal management system based on dual oil circuit coordination according to claim 1, characterized in that, The first heat exchanger is configured to transfer a portion of the heat in the motor oil circuit to the transmission oil circuit when the oil temperature in the motor oil circuit is higher than that in the transmission oil circuit under high motor load conditions, thereby reducing the motor oil temperature and increasing the transmission oil temperature.

7. The vehicle thermal management system based on dual oil circuit coordination according to claim 2, characterized in that, The first heat exchanger is configured to transfer a portion of the heat in the transmission oil circuit to the motor oil circuit when the oil temperature in the transmission oil circuit is higher than that in the motor oil circuit under high load conditions, and then transfer the heat to the vehicle cooling water circuit via the second heat exchanger.

8. The vehicle thermal management system based on dual oil circuit coordination according to claim 2, characterized in that, The second heat exchanger includes an oil-water heat exchanger, which has an oil channel and a water channel inside, and a heat conduction structure is provided between the oil channel and the water channel.

9. The vehicle thermal management system based on dual oil circuit coordination according to claim 2, characterized in that, The vehicle cooling water circuit is also equipped with a water pump with adjustable speed, which is used to adjust the heat exchange efficiency with the second heat exchanger.

10. The vehicle thermal management system based on dual oil circuit coordination according to claim 2, characterized in that, The vehicle cooling water circuit is provided with only one heat exchange interface connected to the motor oil circuit. The heat exchange interface realizes the heat exchange between the vehicle cooling water circuit and the motor oil circuit through the second heat exchanger, and indirectly realizes the heat exchange between the vehicle cooling water circuit and the transmission oil circuit through the series structure of the first heat exchanger and the second heat exchanger.

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