Thermal management system for intelligent agricultural machine

Abstract

The invention discloses a thermal management system for an intelligent agricultural machine. The thermal management system comprises a high-temperature cooling loop, a low-temperature cooling loop, a refrigerant loop and a central controller, the high-temperature cooling loop comprises an engine, a cooling liquid outlet of the engine is fixedly connected with a four-way reversing valve through a pipeline, one connector of the four-way reversing valve is connected with a high-temperature radiator through a pipeline, and one outlet of the four-way reversing valve is connected with a hydraulic heat exchanger through a pipeline. One outlet of the four-way reversing valve is connected with a liquid-liquid heat exchanger through a pipeline; the low-temperature cooling loop comprises a power battery, a driving motor controller, a vehicle-mounted calculation unit, a low-temperature radiator and an electronic water pump; the refrigerant loop is coupled with the low-temperature cooling loop and used for providing cooling capacity for the low-temperature cooling loop. And the four-way reversing valve and the electronic water pump are in signal connection with the central controller. A traditional independent heat source is integrated into a cooperative system, energy dynamic balance is achieved, and an efficient and reliable heat management solution is provided for intelligent agricultural machinery.

Description

Technical Field

[0001] This invention relates to the field of coal blending technology, and more specifically to a thermal management system for intelligent agricultural machinery. Background Technology

[0002] As agriculture develops towards intelligence and automation, modern intelligent agricultural machinery is no longer a simple mechanical device, but a mobile operating platform integrating multiple complex systems. Its thermal management environment faces unprecedented challenges, which existing technologies struggle to address effectively. Current agricultural machinery thermal management systems typically employ a simple, independent, discrete architecture, with each heat source having its own independent or partially integrated cooling circuit, including:

[0003] Engine cooling system: typically consists of a mechanical water pump, thermostat, radiator, and fan. Coolant circulates between the engine water jacket and radiator, relying on the thermostat for mechanical switching between large and small circulation loops. This system is slow to respond and has low temperature control accuracy.

[0004] Hydraulic system cooling: Cooling is mostly achieved using air-cooled oil coolers, relying on the wind blowing from the vehicle's direction of travel or by installing an independent fan. Under low-speed, heavy-load conditions, the cooling efficiency drops sharply.

[0005] Heat dissipation of emerging electrical components: For power batteries, drive motors, electronic control systems, and high-performance on-board computing units (autonomous driving domain controllers) in hybrid or pure electric agricultural machinery, the operating temperature requirements are extremely stringent (usually within a narrow range of -20℃ to 50℃).

[0006] The aforementioned discrete and simplified thermal management solutions have the following technical drawbacks:

[0007] First, when starting in a low-temperature environment, the power battery needs to consume its own precious electrical energy to heat up through the PTC heater; at the same time, a large amount of waste heat generated by the engine is directly dissipated into the atmosphere through the radiator, and the energy is wasted. The system cannot achieve "peak shaving and valley filling" and complementary utilization of energy, resulting in low energy utilization efficiency of the whole vehicle, especially in the cold season, which significantly shortens the driving range and working time of electric agricultural machinery.

[0008] Second, for the engine, it is impossible to keep it working in the optimal temperature range at all times, which affects combustion efficiency. For precision components such as batteries and electronic controls, traditional coarse temperature control is difficult to meet their strict temperature requirements, which can easily lead to a decrease in battery charging and discharging performance, a shortened cycle life, or the computing unit reducing frequency and restarting due to overheating.

[0009] Third, the engine has a high-temperature radiator, the hydraulic system has an air cooler, and the three-electric system may also have an independent low-temperature radiator. The front of the entire agricultural machine may be filled with multiple radiators, making space layout difficult, increasing weight, and raising manufacturing and maintenance costs. The overall design is not compact, occupies effective space, and reliability may decrease with the increase in the number of components.

[0010] Therefore, the present invention provides a thermal management system for intelligent agricultural machinery to solve the problems in the prior art. Summary of the Invention

[0011] To achieve the above objectives, the present invention provides the following technical solution:

[0012] A thermal management system for intelligent agricultural machinery includes a high-temperature cooling circuit, a low-temperature cooling circuit, a refrigerant circuit, and a central controller;

[0013] The high-temperature cooling circuit includes an engine, and the coolant outlet of the engine is fixedly connected to a four-way reversing valve through a pipe. One port of the four-way reversing valve is connected to a high-temperature radiator through a pipe. One outlet of the four-way reversing valve is connected to a hydraulic heat exchanger through a pipe. One outlet of the four-way reversing valve is connected to a liquid-liquid heat exchanger through a pipe.

[0014] The cryogenic cooling circuit includes a power battery, a drive motor controller, an on-board computing unit, a cryogenic radiator, and an electric water pump; the inlet of the internal heat exchange plate of the power battery is connected to the outlet of the electric water pump, and the inlet of the electric water pump is connected to the outlet of the cryogenic radiator.

[0015] The outlet of the internal displacement heat plate of the power battery is connected to an electronic water pump. The outlet of the internal displacement heat plate of the power battery is connected to the inlet of the internal displacement heat plate of the vehicle computing unit through a pipe. The outlet of the internal displacement heat plate of the vehicle computing unit is connected to the low-temperature side inlet of the liquid-liquid heat exchanger.

[0016] The refrigerant circuit is coupled to the cryogenic cooling circuit and is used to provide cooling capacity to the cryogenic cooling circuit;

[0017] The four-way reversing valve and the electronic water pump are both connected to the central controller via signal.

[0018] Furthermore, the high-temperature cooling circuit also includes a high-temperature water pump connected to the inlet of the engine cooling water jacket via a pipe, and the inlet of the high-temperature water pump is connected to the outlet of the hydraulic heat exchanger via a pipe.

[0019] Furthermore, a three-way valve A is fixedly connected to the outlet pipe of the high-temperature radiator.

[0020] A three-way valve B is fixedly connected to the outlet pipe of the liquid-liquid heat exchanger. The three-way valve A and the three-way valve B are connected to the coolant side inlet of the hydraulic heat exchanger through a pipeline.

[0021] Furthermore, a first temperature sensor is fixedly connected to the engine coolant pipeline, and a second temperature sensor is fixedly connected to the outlet pipeline of the hydraulic heat exchanger. Both the first and second temperature sensors are connected to the central controller for signal transmission.

[0022] Furthermore, a third temperature sensor is fixedly connected to the inlet pipe of the internal heat exchange plate of the power battery, a fourth temperature sensor is fixedly connected to the outlet of the internal heat exchange plate of the vehicle computing unit, and a fifth temperature sensor is fixedly connected to the outlet of the low-temperature radiator. The third, fourth, and fifth temperature sensors are all connected to the central controller signal.

[0023] Furthermore, the refrigerant circuit includes a compressor, a condenser, an evaporator, an expansion valve, and a plate heat exchanger; the outlet end of the compressor is connected to the condenser via a pipe, the outlet of the condenser is connected to the expansion valve via a pipe, and the expansion valve and the outlet end of the evaporator are connected in parallel via a gas-liquid separator via a pipe.

[0024] Furthermore, a plate heat exchanger is connected in parallel on the outlet pipe of the condenser, and the plate heat exchanger is built inside the power battery.

[0025] Furthermore, the inlet end of the hydraulic heat exchanger is connected to a hydraulic pipeline, which includes a hydraulic oil tank, a hydraulic pump, a pressure control valve, a hydraulic cylinder, and a filter.

[0026] The outlet end of the hydraulic oil tank is connected to a hydraulic pump via a pipe. The outlet end of the hydraulic pump is connected to a hydraulic cylinder via a pipe. The outlet end of the hydraulic cylinder is fixedly connected to a filter via a pipe. The outlet end of the filter is connected to a hydraulic heat exchanger via a pipe. The pressure control valve is fixedly connected to the outlet pipe of the hydraulic pump.

[0027] Furthermore, the central controller includes an independent heat dissipation mode and a waste heat utilization mode;

[0028] The independent cooling mode is used to control the four-way reversing valve to direct the engine coolant to the high-temperature radiator, while controlling the low-temperature cooling circuit to dissipate heat through the low-temperature radiator. There is no heat exchange between the high-temperature circuit and the low-temperature circuit at the liquid-liquid heat exchanger.

[0029] The waste heat utilization mode is used to control the four-way reversing valve to direct the high-temperature coolant of the engine to the liquid-liquid heat exchanger when the temperature of the power battery is lower than its optimal operating temperature limit. The heat is then transferred to the low-temperature cooling circuit through the liquid-liquid heat exchanger to heat the power battery.

[0030] Furthermore, the central controller also includes a combined cooling mode, which is used to control the refrigerant in the refrigerant circuit to flow through the battery cooling plate heat exchanger to enhance the cooling of the low-temperature cooling circuit when the temperature of the on-board computing unit or drive motor controller exceeds a threshold.

[0031] The present invention has the following advantages:

[0032] 1. By intelligently integrating the high-temperature cooling circuit, low-temperature cooling circuit, refrigerant circuit and central controller, integrated thermal management of multiple heat sources is achieved. This integrated design breaks through the barriers of traditional discrete systems and solves the energy waste and redundancy problems caused by independent cooling of each heat source.

[0033] 2. In low-temperature environments, engine waste heat can be transferred to the low-temperature circuit through a liquid-liquid heat exchanger to heat the power battery, reduce the power consumption of the battery PTC heater, and extend the driving time of agricultural machinery; high-temperature water pumps and temperature sensors (such as the first temperature sensor) ensure that the engine always operates in the optimal temperature range, improving combustion efficiency.

[0034] 3. The low-temperature cooling circuit uses an electronic water pump and a low-temperature radiator to achieve precise temperature control for precision components such as the power battery, drive motor controller and vehicle computing unit. The coolant flows through each component in sequence, absorbs heat and then dissipates it through a liquid-liquid heat exchanger or a low-temperature radiator, ensuring that the components operate in the optimal range and avoiding performance degradation or shortened life.

[0035] 4. The refrigerant circuit serves as an auxiliary cooling method, coupled with the low-temperature circuit through a plate heat exchanger, providing cooling capacity that exceeds conventional heat dissipation. When the on-board computing unit or drive motor controller overheats, the combined cooling mode is activated, and the refrigerant flows through the battery cooling plate heat exchanger to achieve a "supercooling" effect, preventing the system from throttling or restarting.

[0036] 5. The hydraulic heat exchanger connects the hydraulic oil circuit with the high-temperature cooling circuit to achieve liquid-liquid heat exchange, overcoming the insufficient heat dissipation of traditional air coolers under low speed and heavy load; it can cool high-temperature hydraulic oil and heat cold hydraulic oil, ensuring that the hydraulic system can quickly enter the optimal working state.

[0037] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. Attached Figure Description

[0038] To more intuitively illustrate the prior art and this application, exemplary drawings are provided below. It should be understood that the specific shapes and structures shown in the drawings should not generally be regarded as limiting conditions for implementing this application; for example, based on the technical concept disclosed in this application and the exemplary drawings, those skilled in the art are able to easily make conventional adjustments or further optimizations to the addition / reduction / classification, specific shapes, positional relationships, connection methods, size ratios, etc. of certain units (components).

[0039] Figure 1 This invention provides a system block diagram for a thermal management system for intelligent agricultural machinery.

[0040] Figure 2 This is a schematic diagram of the high-temperature cooling circuit in a thermal management system for intelligent agricultural machinery according to the present invention.

[0041] Figure 3 This is a schematic diagram of the low-temperature cooling circuit in a thermal management system for intelligent agricultural machinery according to the present invention.

[0042] Figure 4 This is a schematic diagram of the refrigerant circuit in a thermal management system for intelligent agricultural machinery according to the present invention.

[0043] Figure 5 This is a schematic diagram of the hydraulic pipeline structure in a thermal management system for intelligent agricultural machinery according to the present invention.

[0044] Figure 6 This is a piping diagram of a refrigerant circuit in a thermal management system for intelligent agricultural machinery according to the present invention.

[0045] In the diagram: 10, Engine; 20, Four-way directional valve; 30, High-temperature radiator; 40, Three-way valve A; 50, Liquid-liquid heat exchanger; 60, Three-way valve B; 70, Hydraulic heat exchanger; 701, Hydraulic oil tank; 702, Hydraulic pump; 703, Pressure control valve; 704, Hydraulic cylinder; 705, Filter; 80, High-temperature water pump; 90, Power battery; 100, Drive motor controller; 110, On-board computing unit; 120, Low-temperature radiator; 130, Electronic water pump; 140, Compressor; 150, Condenser; 160, Evaporator; 170, Expansion valve; 180, Plate heat exchanger; 190, First temperature sensor; 200, Second temperature sensor; 210, Third temperature sensor; 220, Fourth temperature sensor; 230, Fifth temperature sensor; 240, Gas-liquid separator. Detailed Implementation

[0046] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. It should be understood that these embodiments are merely for further explanation of the present invention and should not be construed as limiting the scope of protection of the present invention. Technical engineers in the field can make some non-essential improvements and adjustments to the present invention based on the above-described content. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] Please see Figure 1-6 A thermal management system for intelligent agricultural machinery includes a high-temperature cooling circuit, a low-temperature cooling circuit, a refrigerant circuit, and a central controller.

[0048] The high-temperature cooling circuit includes an engine 10. The coolant outlet of the engine 10 is fixedly connected to a four-way reversing valve 20 via a pipe. One port of the four-way reversing valve 20 is connected to a high-temperature radiator 30 via a pipe. One outlet of the four-way reversing valve 20 is connected to a hydraulic heat exchanger 70 via a pipe. One outlet of the four-way reversing valve 20 is connected to a liquid-liquid heat exchanger 50 via a pipe. The inlet of the cooling water jacket of the engine 10 is connected to a high-temperature water pump 80 via a pipe. The inlet of the high-temperature water pump 80 is connected to the outlet of the hydraulic heat exchanger 70 via a pipe.

[0049] The low-temperature cooling circuit includes a power battery 90, a drive motor controller 100, an on-board computing unit 110, a low-temperature radiator 120, and an electric water pump 130; the inlet of the internal heat exchange plate of the power battery 90 is connected to the outlet of the electric water pump 130, and the inlet of the electric water pump 130 is connected to the outlet of the low-temperature radiator 120.

[0050] The outlet of the internal heat exchange plate of the power battery 90 is connected to an electronic water pump 130. The outlet of the internal heat exchange plate of the power battery 90 is connected to the inlet of the internal heat exchange substrate of the vehicle computing unit 110 through a pipe. The outlet of the internal heat exchange substrate of the vehicle computing unit 110 is connected to the low-temperature side inlet of the liquid-liquid heat exchanger 50.

[0051] The refrigerant circuit is coupled to the cryogenic cooling circuit and is used to provide cooling capacity to the cryogenic cooling circuit;

[0052] The four-way reversing valve 20 and the electronic water pump 130 are both connected to the central controller via signal.

[0053] In this embodiment,

[0054] High-temperature cooling circuit: Engine 10 serves as the main heat source. After its coolant flows out, it is distributed by the four-way reversing valve 20. The coolant can be directed to the high-temperature radiator 30 for forced air cooling, or to the liquid-liquid heat exchanger 50. After that, the coolant flows through the hydraulic heat exchanger 70 to cool or heat the hydraulic oil. Finally, it is pumped back to the engine by the high-temperature water pump 80, forming a closed loop.

[0055] Low-temperature cooling circuit: The electric water pump 130 drives the coolant to flow sequentially through the power battery 90, the drive motor controller 100 and the on-board computing unit 110, absorbing the heat of these precision components; then, the coolant flows through the low-temperature side of the liquid-liquid heat exchanger 50 to exchange heat with the high-temperature circuit, and finally dissipates the residual heat into the atmosphere through the low-temperature radiator 120.

[0056] Refrigerant circuit: As an auxiliary cooling method, it is activated when strong cooling is required, and its cooling capacity is transferred to the low-temperature cooling circuit through plate heat exchanger 180.

[0057] Intelligent control: The central controller is the brain of the entire system. It receives data from various temperature sensors and controls the four-way reversing valve 20, electronic water pump 130, valves and other actuators accordingly to achieve seamless switching between different working modes.

[0058] The inlet of the high-temperature water pump 80 is directly connected to the outlet of the hydraulic heat exchanger 70. This means that the coolant flowing from either the high-temperature radiator 30 or the liquid-liquid heat exchanger 50 will be actively pumped into the engine cooling water jacket by the high-temperature water pump after passing through the hydraulic system, thereby establishing a stable and controllable high-temperature coolant circulation. This design provides stable flow and pressure, ensuring that the coolant can effectively remove the huge amount of heat from the engine and hydraulic system.

[0059] By integrating the thermal management of the engine 10, hydraulic system, three-electric system battery, electronic control, motor, and high-performance computing unit into one, the problems of traditional independent systems and structural redundancy are solved; it provides a physical basis for realizing advanced functions such as waste heat recovery and multi-heat source staged cooling of the engine 10, and fundamentally improves energy utilization efficiency.

[0060] In a further preferred embodiment of the present invention, a three-way valve A40 is fixedly connected to the outlet pipe of the high-temperature radiator 30, and a three-way valve B60 is fixedly connected to the outlet pipe of the liquid-liquid heat exchanger 50. The three-way valve A40 and the three-way valve B60 are connected to the coolant side inlet of the hydraulic heat exchanger 70 through a pipeline.

[0061] In this embodiment, two three-way valves merge the two coolant paths from the high-temperature radiator 30 and the liquid-liquid heat exchanger 50, connecting them together to the hydraulic heat exchanger 70. The central controller can adjust the opening of these two three-way valves to achieve multiple modes:

[0062] Pure cooling mode: Three-way valve A40 is fully open, three-way valve B60 is closed, and all coolant is cooled by the high-temperature radiator 30;

[0063] Pure waste heat utilization mode: Three-way valve A is closed, three-way valve B is fully open, and all high-temperature coolant is used to heat the low-temperature circuit;

[0064] Hybrid mode: Distributes the flow of the two paths proportionally as needed to achieve the finest temperature control;

[0065] This design enables stepless adjustment of coolant flow, making the system's thermal management strategy more flexible and precise; it also provides redundant control paths, so that even if one path fails, the other path can still maintain basic circulation.

[0066] In a further preferred embodiment of the present invention, a first temperature sensor 190 is fixedly connected to the coolant pipe of the engine 10, and a second temperature sensor 200 is fixedly connected to the outlet pipe of the hydraulic heat exchanger 70. Both the first temperature sensor 190 and the second temperature sensor 200 are connected to the central controller for signal connection. A third temperature sensor 210 is fixedly connected to the inlet pipe of the internal heat exchange plate of the power battery 90, a fourth temperature sensor 220 is fixedly connected to the outlet of the internal heat exchange substrate of the on-board computing unit 110, and a fifth temperature sensor 230 is fixedly connected to the outlet of the low-temperature radiator 120. The third temperature sensor 210, the fourth temperature sensor 220, and the fifth temperature sensor 230 are all connected to the central controller for signal connection.

[0067] In this embodiment, the first temperature sensor 190 is used to monitor the engine outlet coolant temperature, which is the core basis for controlling the four-way reversing valve; the second temperature sensor 200 is used to monitor the coolant temperature before entering the water pump, reflecting the final thermal state of the entire high-temperature circuit; the third temperature sensor 210 is used to directly monitor the battery temperature, which is the most critical signal to trigger battery heating or cooling; the fourth temperature sensor 220 is used to monitor the coolant temperature at the computing unit outlet, reflecting its heat load; and the fifth temperature sensor 230 is used to monitor the return water temperature of the low-temperature circuit, used to control the low-temperature radiator fan. These real-time data are continuously transmitted to the central controller, providing the central controller with comprehensive and accurate system thermal state information, making all control decisions based on evidence. By monitoring the temperature change trend in real time, overheating risks can be warned in advance to prevent equipment damage.

[0068] In a further preferred embodiment of the present invention, the refrigerant circuit includes a compressor 140, a condenser 150, an evaporator 160, an expansion valve 170, and a plate heat exchanger 180; the outlet end of the compressor 140 is connected to the condenser 150 via a pipe, the outlet of the condenser 150 is connected to the expansion valve 170 via a pipe, the expansion valve 170 and the outlet end of the evaporator 160 are connected in parallel via a pipe to a gas-liquid separator 240, the outlet pipe of the condenser 150 is connected in parallel to the plate heat exchanger 180, and the plate heat exchanger 180 is built inside the power battery 90.

[0069] In this embodiment, the plate heat exchanger 180 is connected to the refrigerant circuit via a parallel branch. When powerful cooling of the battery is required, the central controller opens the branch solenoid valve, allowing some high-pressure liquid refrigerant to flow into the plate heat exchanger 180. The refrigerant evaporates here, absorbing heat from the low-temperature coolant flowing through its water side, rapidly lowering the coolant temperature (which can be below ambient temperature), thus achieving a "supercooling" effect on the battery. Afterward, the refrigerant vapor merges with the refrigerant in the main circuit and returns to the compressor 140, solving the problem of insufficient heat dissipation under extreme high temperatures or loads caused by simple air cooling. This ensures the thermal safety of the battery and computing unit under extreme operating conditions. This mode is only activated when needed, avoiding energy loss from continuously running the air conditioning compressor.

[0070] In a further preferred embodiment of the present invention, the inlet end of the hydraulic heat exchanger 70 is connected to a hydraulic pipeline, which includes a hydraulic oil tank 701, a hydraulic pump 702, a pressure control valve 703, a hydraulic cylinder 704, and a filter 705; the outlet end of the hydraulic oil tank 701 is connected to the hydraulic pump 702 through a pipeline, the outlet end of the hydraulic pump 702 is connected to the hydraulic cylinder 704 through a pipeline, the outlet end of the hydraulic cylinder 704 is fixedly connected to the filter 705 through a pipeline, the outlet end of the filter 705 is connected to the hydraulic heat exchanger 70 through a pipeline, and the pressure control valve 703 is fixedly connected to the outlet pipeline of the hydraulic pump 702.

[0071] In this embodiment, the hot oil generated during the operation of the hydraulic system flows through the hydraulic heat exchanger 70 in the return oil line. Here, the hydraulic oil exchanges heat with the coolant in the engine's high-temperature cooling circuit. The system can choose to use a "cooler" coolant to dissipate heat from the hydraulic oil or a "hotter" coolant to heat the cold hydraulic oil, as needed. The liquid-liquid heat exchange efficiency is high and is not affected by vehicle speed. Compared with traditional air coolers, it has a better heat dissipation effect under low-speed and heavy-load conditions. This design has dual functions of cooling and heating, ensuring that the hydraulic system can quickly enter the optimal working state under various ambient temperatures.

[0072] In a further preferred embodiment of the present invention, the central controller includes an independent heat dissipation mode and a waste heat utilization mode;

[0073] The independent cooling mode is used to control the four-way reversing valve 20 to direct the coolant of the engine 10 to the high-temperature radiator 30, while controlling the low-temperature cooling circuit to dissipate heat through the low-temperature radiator 120. There is no heat exchange between the high-temperature circuit and the low-temperature circuit at the liquid-liquid heat exchanger 50. This mode is suitable for normal temperature conditions, avoids heat interference between systems, and ensures that each system operates at its optimal temperature.

[0074] The waste heat utilization mode is used to control the four-way reversing valve 20 to make the high-temperature coolant of the engine 10 flow to the liquid-liquid heat exchanger 50 when the temperature of the power battery 3 is lower than its optimal operating temperature limit. The heat is transferred to the low-temperature cooling circuit through the liquid-liquid heat exchanger 50 to heat the power battery 3. This mode greatly reduces the power consumption of the battery PTC heater, significantly improves the vehicle's driving range in cold environments, and realizes energy recovery and utilization.

[0075] In a further preferred embodiment of the present invention, the central controller also includes a combined cooling mode. The combined cooling mode is used to control the refrigerant in the refrigerant circuit to flow through the battery cooling plate heat exchanger 180 when the temperature of the on-board computing unit 110 or the drive motor controller 100 exceeds a threshold, thereby enhancing the cooling of the low-temperature cooling circuit. This mode provides cooling capacity that exceeds conventional heat dissipation, effectively copes with instantaneous high heat loads, prevents the system from throttling or being damaged due to overheating, and ensures the continuity and safety of operation.

[0076] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A thermal management system for intelligent agricultural machinery, characterized in that, This includes a high-temperature cooling circuit, a low-temperature cooling circuit, a refrigerant circuit, and a central controller; The high-temperature cooling circuit includes an engine (10), the coolant outlet of the engine (10) is fixedly connected to a four-way reversing valve (20) through a pipe, one port of the four-way reversing valve (20) is connected to a high-temperature radiator (30) through a pipe, one outlet of the four-way reversing valve (20) is connected to a hydraulic heat exchanger (70) through a pipe, and one outlet of the four-way reversing valve (20) is connected to a liquid-liquid heat exchanger (50) through a pipe. The cryogenic cooling circuit includes a power battery (90), a drive motor controller (100), an on-board computing unit (110), a cryogenic radiator (120), and an electric water pump (130); the inlet of the internal heat exchange plate of the power battery (90) is connected to the outlet of the electric water pump (130), and the inlet of the electric water pump (130) is connected to the outlet of the cryogenic radiator (120). The outlet of the heat exchange plate inside the power battery (90) is connected to an electronic water pump (130). The outlet of the heat exchange plate inside the power battery (90) is connected to the inlet of the heat exchange substrate inside the vehicle computing unit (110) through a pipe. The outlet of the heat exchange substrate inside the vehicle computing unit (110) is connected to the low-temperature side inlet of the liquid-liquid heat exchanger (50). The refrigerant circuit is coupled to the cryogenic cooling circuit and is used to provide cooling capacity to the cryogenic cooling circuit; The four-way reversing valve (20) and the electronic water pump (130) are both connected to the central controller via signal.

2. The thermal management system for intelligent agricultural machinery according to claim 1, characterized in that, The high-temperature cooling circuit also includes a high-temperature water pump (80) connected to the inlet of the engine (10) cooling water jacket via a pipe, and the inlet of the high-temperature water pump (80) is connected to the outlet of the hydraulic heat exchanger (70) via a pipe.

3. A thermal management system for intelligent agricultural machinery according to claim 2, characterized in that, A three-way valve A (40) is fixedly connected to the outlet pipe of the high-temperature radiator (30). A three-way valve B (60) is fixedly connected to the outlet pipe of the liquid-liquid heat exchanger (50). The three-way valve A (40) and the three-way valve B (60) are connected to the coolant side inlet of the hydraulic heat exchanger (70) through a pipeline.

4. A thermal management system for intelligent agricultural machinery according to claim 1, characterized in that, A first temperature sensor (190) is fixedly connected to the coolant pipe of the engine (10), and a second temperature sensor (200) is fixedly connected to the outlet pipe of the hydraulic heat exchanger (70). Both the first temperature sensor (190) and the second temperature sensor (200) are connected to the central controller signal.

5. A thermal management system for intelligent agricultural machinery according to claim 1, characterized in that, A third temperature sensor (210) is fixedly connected to the inlet pipe of the heat exchange plate inside the power battery (90), a fourth temperature sensor (220) is fixedly connected to the outlet of the heat exchange plate inside the vehicle computing unit (110), and a fifth temperature sensor (230) is fixedly connected to the outlet of the low-temperature radiator (120). The third temperature sensor (210), the fourth temperature sensor (220), and the fifth temperature sensor (230) are all connected to the central controller signal.

6. A thermal management system for intelligent agricultural machinery according to claim 1, characterized in that, The refrigerant circuit includes a compressor (140), a condenser (150), an evaporator (160), an expansion valve (170), and a plate heat exchanger (180); the outlet end of the compressor (140) is connected to the condenser (150) through a pipe, the outlet of the condenser (150) is connected to the expansion valve (170) through a pipe, and the outlet end of the expansion valve (170) and the outlet end of the evaporator (160) are connected in parallel through a pipe to a gas-liquid separator (240).

7. A thermal management system for intelligent agricultural machinery according to claim 6, characterized in that, A plate heat exchanger (180) is connected in parallel on the outlet pipe of the condenser (150), and the plate heat exchanger (180) is built inside the power battery (90).

8. A thermal management system for intelligent agricultural machinery according to claim 1, characterized in that, The inlet end of the hydraulic heat exchanger (70) is connected to a hydraulic pipeline, which includes a hydraulic oil tank (701), a hydraulic pump (702), a pressure control valve (703), a hydraulic cylinder (704), and a filter (705). The outlet end of the hydraulic oil tank (701) is connected to a hydraulic pump (702) via a pipe. The outlet end of the hydraulic pump (702) is connected to a hydraulic cylinder (704) via a pipe. The outlet end of the hydraulic cylinder (704) is fixedly connected to a filter (705) via a pipe. The outlet end of the filter (705) is connected to a hydraulic heat exchanger (70) via a pipe. The pressure control valve (703) is fixedly connected to the outlet pipe of the hydraulic pump (702).

9. A thermal management system for intelligent agricultural machinery according to claim 1, characterized in that, The central controller includes an independent heat dissipation mode and a waste heat utilization mode; The independent cooling mode is used to control the four-way reversing valve (20) to make the coolant of the engine (10) flow to the high-temperature radiator (30), while controlling the low-temperature cooling circuit to dissipate heat through the low-temperature radiator (120). There is no heat exchange between the high-temperature circuit and the low-temperature circuit at the liquid-liquid heat exchanger (50). The waste heat utilization mode is used to control the four-way reversing valve (20) to make the high-temperature coolant of the engine (10) flow to the liquid-liquid heat exchanger (50) when the temperature of the power battery (3) is lower than its optimal operating temperature limit. The heat is transferred to the low-temperature cooling circuit through the liquid-liquid heat exchanger (50) to heat the power battery (3).

10. A thermal management system for intelligent agricultural machinery according to claim 1, characterized in that, The central controller also includes a combined cooling mode, which is used to control the refrigerant in the refrigerant circuit to flow through the battery cooling plate heat exchanger (180) to enhance the cooling of the low-temperature cooling circuit when the temperature of the on-board computing unit (110) or the drive motor controller (100) exceeds a threshold.

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