Integrated thermal management system and control method therefor, harvester

Abstract

The present application relates to the technical field of agricultural machinery, and provides an integrated heat management system, a control method thereof and a harvester.The condenser, the low-temperature radiator and the high-temperature radiator are arranged side by side and share a fan, the water inlets of the first water pump and the second water pump are connected in parallel to the water inlet of the low-temperature radiator; the first radiator branch is connected with the first water pump and comprises a plurality of motors / controllers; the second radiator branch is connected with the second water pump and comprises a plurality of motors / controllers and a power distribution module; the heating circuit comprises a battery circuit, an air conditioner circuit and an engine circuit, the battery circuit and the air conditioner circuit are connected in parallel, the engine circuit is connected with the high-temperature radiator in circulation, and the engine circuit is further connected with the battery circuit and the air conditioner circuit through a valve assembly; the refrigeration circuit is connected with the condenser, the battery circuit and the air conditioner circuit in circulation; and the control module is intelligently controlled.The present application can not only ensure sufficient cooling in a high-load branch, but also reduce the flow in a low-load branch, thereby saving energy consumption.

Description

Technical Field

[0001] This invention relates to the field of agricultural machinery technology, and in particular to an integrated thermal management system and its control method, and a harvester. Background Technology

[0002] As agricultural mechanization develops towards high efficiency, intelligence, and energy conservation, hybrid harvesters, with their advantages of strong power and significant fuel-saving potential, are gradually becoming the mainstream direction for harvester technology upgrades. However, hybrid harvesters integrate multiple heat source components such as engines, drive motors and controllers, power batteries, and air conditioning systems. Their thermal management systems need to simultaneously address multiple thermal management requirements, including engine cooling, motor and electronic control cooling, battery thermal management, and cab air conditioning. Furthermore, harvester operations in the field encounter harsh conditions such as drastic load fluctuations, significant ambient temperature differences, and abundant dust and impurities, placing high demands on the integration, control precision, and adaptability of the thermal management system.

[0003] Currently, hybrid power harvesters generally adopt a conventional thermal management architecture with independent cooling loops. Specifically, the engine, drive motor and controller, power battery, and air conditioning system each have their own independent cooling circulation loops. Each loop operates independently through its own conventional components such as water pumps, radiators, and cooling fans, performing only a single cooling function and failing to achieve overall heat allocation and efficient utilization. This decentralized architecture results in redundant cooling system structure, large space occupation, and an inability for heat synergy between multiple heat sources, leading to low overall thermal management efficiency.

[0004] In terms of thermal management control, existing harvesters generally employ a threshold-based on / off control strategy. This control method relies on temperature sensors built into each component to collect temperature signals. When the temperature of a component reaches a preset threshold, the corresponding actuator, such as a water pump, fan, or heater, is directly activated; when the temperature drops below the threshold, it is shut down. This passive control method has significant drawbacks: First, the control action lags behind changes in thermal load, failing to provide preventative cooling before sudden load increases, resulting in instantaneous temperature spikes in components and impacting lifespan and reliability. Second, the control is executed independently at a single point, failing to achieve coordinated flow regulation among multiple motor control branches. This leads to overheating in high-load branches due to insufficient flow and wasted pump power in low-load branches due to excessive flow. Third, the control system lacks the ability to adaptively adjust based on comprehensive information such as field operating conditions, ambient temperature, and overall machine load status, making it unable to match optimal heat dissipation strategies for typical variable operating conditions such as sudden changes in harvester header feed rate and threshing drum stall. Summary of the Invention

[0005] This invention provides an integrated thermal management system and its control method, as well as a harvester, to solve the shortcomings of existing technologies that cannot achieve overall heat allocation and efficient utilization. It can implement differentiated flow supply according to the differences in heat load of each group under different working conditions, effectively solving the problem of supply and demand mismatch. It can ensure sufficient cooling in high-load branches and reduce flow in low-load branches, achieving on-demand allocation and saving water pump energy consumption.

[0006] A first aspect of the present invention provides an integrated thermal management system, comprising: The cooling pack assembly includes a condenser, a low-temperature radiator, and a high-temperature radiator arranged side by side, wherein the condenser, the low-temperature radiator, and the high-temperature radiator share a fan driven by the engine; The motor control cooling circuit includes: The inlets of the first and second water pumps are connected in parallel to the inlet of the low-temperature radiator. The first heat dissipation branch is connected to the outlet of the first water pump, and the first heat dissipation branch includes multiple motors and multiple controllers; The second heat dissipation branch is connected to the outlet of the second water pump. The second heat dissipation branch includes multiple motors, multiple controllers, and a power distribution module. The heating circuit includes a battery circuit, an air conditioning circuit, and an engine circuit. The battery circuit and the air conditioning circuit are connected in parallel. The engine circuit is circulatedly connected to the high-temperature radiator. The engine circuit is also connected to the battery circuit and the air conditioning circuit through a valve assembly to selectively supply engine heat to the battery circuit and / or the air conditioning circuit. The refrigeration circuit is cyclically connected to the condenser, the battery circuit, and the air conditioning circuit; The control module is configured to: acquire the engine water temperature, the inlet and outlet water temperatures of the low-temperature radiator and the refrigerant exhaust temperature, as well as the internal temperatures of the plurality of motors and controllers; control the actual opening degree of the fan based on the corresponding temperatures, and control the speed levels of the first water pump and the second water pump based on the internal temperatures; and acquire information on the amount of grain harvested by the harvester, and predict the load changes of the associated motors based on the information on the amount of grain harvested, so as to increase the speed level of the corresponding water pump in advance.

[0007] According to the integrated thermal management system provided by the present invention, the first heat dissipation branch includes: The first series branch is connected to the outlet of the first water pump. The first series branch includes a first dual main drive controller and a front drive controller arranged in series. The outlet of the front drive controller is connected in parallel with the first branch and the second branch. The first branch includes a bridge motor and a cutting table motor arranged in series. The second branch includes a front axle motor and a first fan motor arranged in series. The second series branch is connected to the outlet of the first water pump and is set in parallel with the first series branch. The second series branch includes a second dual main drive controller, a range extender controller and a range extender motor set in series.

[0008] According to the integrated thermal management system provided by the present invention, the second heat dissipation branch includes: The third series branch is connected to the outlet of the second water pump. The third series branch includes a third dual main drive controller and a fourth dual main drive controller connected in series. The outlet of the fourth dual main drive controller is connected in parallel with the third branch and the fourth branch. The third branch includes a feed motor and a lifting motor connected in series. The fourth branch includes a power distribution module and a second fan motor connected in series. The fourth series branch is connected to the outlet of the second water pump and is set in parallel with the third series branch. The fourth series branch includes a single main drive controller and a rear drive controller set in series. The outlet of the rear drive controller is connected in parallel with a fifth branch and a sixth branch. The fifth branch includes a rear drive motor and a shredding motor set in series. The sixth branch includes a grass discharge motor and a drum motor set in series.

[0009] According to the integrated thermal management system provided by the present invention, the refrigeration circuit includes a compressor, the condenser and the expansion valve connected in a cycle. The refrigeration circuit is connected to the primary side of the refrigerant-water heat exchanger and the evaporator of the air conditioning circuit through refrigerant pipelines, and the refrigerant-water heat exchanger and the evaporator are arranged in parallel. The refrigerant distribution is controlled by the second solenoid valve and the expansion valve.

[0010] According to the integrated thermal management system provided by the present invention, the battery circuit includes a battery pack, a third water pump, and a water-to-water heat exchanger. The battery pack, the third water pump, the secondary side of the refrigerant-to-water heat exchanger, and the secondary side of the water-to-water heat exchanger are connected in series to form a circulation loop. The water-to-water heat exchanger is connected in parallel with the air conditioning circuit.

[0011] According to the integrated thermal management system provided by the present invention, the engine circuit includes an engine water jacket and an engine water pump arranged in series; The outlet of the engine water jacket is connected in series with the first opening of the valve assembly; The primary side of the water-to-water heat exchanger is connected in series at the second opening of the valve assembly.

[0012] According to the integrated thermal management system provided by the present invention, the refrigeration circuit includes a compressor, a second solenoid valve and an expansion valve connected in a cycle, the refrigerant-water heat exchanger and the evaporator of the air conditioning circuit are arranged in parallel, and the refrigerant distribution is controlled by the second solenoid valve and the expansion valve.

[0013] According to the integrated thermal management system provided by the present invention, the heating circuit further includes a first solenoid valve and a heating branch, the heating branch being arranged in parallel with the engine circuit, and the first solenoid valve being connected between the engine circuit and the heating branch.

[0014] According to the integrated thermal management system provided by the present invention, the heating branch includes a heater and a fourth water pump arranged in series; The heater is connected to the first solenoid valve, and the fourth water pump is connected to the engine circuit.

[0015] According to the integrated thermal management system provided by the present invention, the air conditioning circuit includes an air conditioning unit, and the air conditioning unit is provided with an evaporator and a heating core. The evaporator is connected in the refrigeration circuit; The heater core is selectively connected to the engine circuit or the heating branch through the valve assembly to obtain heat.

[0016] A second aspect of the present invention provides an integrated thermal management control method, applied to any of the integrated thermal management systems described in the present invention, comprising the following steps: The engine coolant temperature, the inlet and outlet water temperatures of the low-temperature radiator, and the refrigerant exhaust temperature are obtained. Based on the engine coolant temperature, the requested fan opening degree of the engine is determined. Based on the inlet and outlet water temperatures of the low-temperature radiator, the requested fan opening degree of the motor circuit is determined. Based on the refrigerant exhaust temperature, the requested fan opening degree of the condenser is determined. The maximum value is used to control the actual fan opening degree. The internal temperatures of the multiple motors and multiple controllers are obtained, and the speed levels of the first and second water pumps are controlled according to the internal temperatures. The harvested grain amount information of the harvester is also obtained. When the harvested grain amount increases, the load of the associated motors is predicted to increase, and the speed level of the corresponding water pump is increased in advance. Obtain the heating request signal and the engine coolant temperature, and determine the heating mode: When the engine coolant temperature is higher than the first preset threshold and a heating request is made, the system is controlled to enter the single engine waste heat heating mode. When the engine coolant temperature is lower than the second preset threshold or the engine stops, the control enters the single heater heating mode. When the engine coolant temperature is between the first preset threshold and the second preset threshold, the system is controlled to enter the dual-source heating mode of the engine and heater.

[0017] According to the integrated thermal management control method provided by the present invention, when entering the single-engine waste heat heating mode: When only the battery pack has a heating request, the valve assembly is controlled to circulate hot water from the engine water jacket through the primary side of the water-to-water heat exchanger to heat the battery circuit. When only the driver's cab requests heating, the valve assembly is controlled to allow hot water to flow through the heating core of the air conditioning unit; When both the battery pack and the cab request heating, the valve assembly is controlled to allow hot water to flow simultaneously through the primary side of the water-to-water heat exchanger and the heating core of the air conditioning unit.

[0018] A third aspect of the present invention provides a harvester including the integrated thermal management system described in any one of the claims.

[0019] The integrated thermal management system provided by this invention eliminates multiple independent fans and their drive controllers by arranging the condenser, low-temperature radiator, and high-temperature radiator side-by-side and sharing a single fan. This simplifies the cooling pack layout, reduces cost and space occupation, and results in a more compact structure. The parallel architecture with dual water pump inlets ensures that the temperature of the coolant in both paths is completely consistent before entering their respective cooling branches. Furthermore, each pump can be started, stopped, and its speed adjusted independently, providing a structural basis for subsequent grouped temperature control. Numerous motors, controllers, and power distribution modules are divided into two groups based on power consumption characteristics and operational relevance, each supplied with cooling water by an independent water pump. This grouped architecture can implement differentiated flow supply according to the differences in heat load of each group under different operating conditions, effectively solving the problem of supply-demand mismatch. It ensures sufficient cooling in high-load branches while reducing flow in low-load branches, achieving on-demand allocation and saving water pump energy.

[0020] Engine waste heat is integrated into the overall thermal management system for unified allocation, with selective heat supply achieved through valve components. When the engine coolant temperature is suitable, waste heat can be directly used to heat the battery and / or the cab, achieving waste heat recovery and utilization. This improves the overall energy efficiency of the machine, reduces the frequency of electric heater use, extends pure electric operation time, or reduces fuel consumption. The battery circuit and air conditioning circuit are connected in parallel, allowing for independent or simultaneous heat acquisition, flexibly adapting to the thermal needs of different scenarios.

[0021] The cooling capacity generated by the refrigeration circuit serves both the battery circuit and the air conditioning circuit simultaneously through refrigerant piping, achieving shared cooling capacity. This eliminates the need for separate compressors and condensers for battery cooling and cab air conditioning, reducing the number of core refrigeration components, lowering system complexity and cost, and simplifying the structural layout.

[0022] The control module enables multi-source information sensing and intelligent regulation. First, it determines the fan opening based on the combined heat dissipation needs of the engine, motor circuit, and condenser, using the largest value to ensure that all heat sources do not overheat. Second, it adjusts the corresponding water pump speeds based on the actual internal temperatures of multiple controllers, achieving precise closed-loop feedback control. Crucially, it incorporates information on the amount of harvested grain for load prediction, transforming the thermal management system from a delayed response to proactive preventative cooling. This effectively addresses thermal shocks caused by sudden load changes during harvesting, improving temperature control accuracy and system adaptability, and ensuring that motors and controllers do not overheat or fail during continuous high-load operation.

[0023] The integrated thermal management control method and harvester provided by this invention, because they are applied to or include the aforementioned integrated thermal management system, possess all the advantages of the aforementioned integrated thermal management system. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the motor electronic control heat dissipation circuit in the integrated thermal management system provided by the present invention.

[0026] Figure 2 This is a schematic diagram of the heating circuit in the integrated thermal management system provided by the present invention.

[0027] Figure 3 This is a schematic diagram of the refrigeration circuit in the integrated thermal management system provided by the present invention.

[0028] Figure 4 This is a schematic diagram showing the arrangement of the condenser, low-temperature radiator, and high-temperature radiator in the integrated thermal management system provided by this invention.

[0029] Figure 5 This is a flowchart illustrating the integrated thermal management control method provided by the present invention.

[0030] Figure 6 This is a detailed flowchart illustrating the integrated thermal management control method provided by the present invention. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0032] See Figures 1 to 4 This invention provides an integrated thermal management system designed to address the problem of fragmented management of multiple heat sources, which prevents the coordinated allocation and efficient utilization of heat across the entire machine. Structurally, this integrated thermal management system mainly comprises a cooling package assembly, a motor and electronic control heat dissipation circuit, an integrated thermal management circuit (heating circuit / cooling circuit), and a control module.

[0033] The cooling pack assembly consists of three heat exchangers arranged side-by-side: a condenser, a low-temperature radiator, and a high-temperature radiator. These three heat exchangers share a single fan driven by the engine. This differs from the traditional arrangement of multiple independent fans, achieving structural integration and cost reduction.

[0034] The motor and electronic control cooling circuit provides centralized thermal management for more than a dozen motors and controller components on the harvester. The motor and electronic control cooling circuit includes a first water pump, a second water pump, a first cooling branch, and a second cooling branch. The inlets of the first and second water pumps are connected in parallel to the outlet of the low-temperature radiator, forming two independently adjustable water supply lines.

[0035] The first cooling branch connects to the outlet of the first water pump and supplies coolant to a specific group of multiple motors and controllers. The second cooling branch connects to the outlet of the second water pump and supplies coolant to another group of multiple motors, controllers, and power distribution units (PDUs). This method of grouping heat sources by power consumption and location and using independent water pumps to supply coolant achieves a control basis for flow zoning and on-demand supply.

[0036] The integrated thermal management loop (heating loop / cooling loop) deeply integrates the thermal management of the battery pack, air conditioning and engine, realizing the coordinated allocation of energy.

[0037] The heating circuit includes an engine circuit, a battery circuit, and an air conditioning circuit. The battery circuit and the air conditioning circuit are connected in parallel and share a heat source. The engine circuit is connected to a high-temperature radiator for self-heating and is also connected to the battery circuit and the air conditioning circuit via a valve assembly (such as a three-way valve). The valve assembly acts as a heat distribution center, selectively supplying waste heat from the engine to the battery circuit and / or the air conditioning circuit for heating, thus achieving the recovery and utilization of engine waste heat.

[0038] The refrigeration circuit is circulated and connected to the condenser, battery circuit, and air conditioning circuit via refrigerant piping. The cooling capacity generated by the refrigeration circuit is not for a single purpose, but is distributed through piping to simultaneously or selectively supply the air conditioning circuit (through its internal evaporator) to cool the cab, and to the battery circuit (through its internal refrigerant-water heat exchanger) to cool the battery pack. This achieves a shared cooling source, eliminating the need for separate compressors and condensers for each cooling application.

[0039] The control module is electrically connected to temperature sensors and actuators (water pumps, fans, valves) throughout the system. The control module is configured to acquire real-time engine coolant temperature, radiator inlet and outlet temperatures, refrigerant exhaust temperature, and the internal temperatures of all motors and controllers. Based on the combined heat demands from multiple sources, including engine coolant temperature, radiator temperature, and refrigerant pressure and temperature, it makes comprehensive decisions and controls the actual fan opening. Furthermore, based on the real-time internal temperatures of each motor and controller, it dynamically adjusts the speed settings of the first and second water pumps.

[0040] The control module is also used to acquire information about the amount of grain harvested by the harvester (e.g., indirectly through the feed rate sensor, header speed and torque). Based on this information, it predicts that the load on the associated motors will increase and proactively increases the speed of the corresponding water pumps, achieving a qualitative leap from delayed response to proactive prediction. Specifically, the control module communicates with the harvester's feed rate sensor or header torque sensor. When it detects an increase in the feed rate or a header torque increase rate exceeding a preset threshold, it determines that the amount of harvested grain has increased, thus predicting an increase in the load on the associated motors.

[0041] The control module can be a standalone electronic control unit (ECU) or integrated into the harvester's vehicle control unit (VCU). It includes a processor, a memory, and input / output interfaces. The processor executes the computer program stored in the memory to implement the aforementioned control functions.

[0042] The working process and design principle of the integrated thermal management system provided in the embodiments of the present invention will be described below in conjunction with typical operating conditions: When the harvester starts operating, the engine drives the fan to rotate, simultaneously activating the engine water pump. The control module monitors the signals from various temperature sensors in real time. Low-temperature coolant flows from the low-temperature radiator and enters the first and second water pumps. The first water pump delivers the coolant to the first cooling branch, flowing sequentially through each motor and controller in that branch, absorbing heat before returning to the low-temperature radiator. The second water pump works similarly, cooling the motors, controllers, and power distribution module in the second cooling branch. The two return streams converge and are cooled by the fan airflow in the low-temperature radiator, completing the cycle.

[0043] Scene 1: Heavy-load harvesting operations in the field The control module senses a sharp increase in the amount of harvested grain and, based on a preset strategy, predicts that the load on the relevant motors (located in the first or second heat dissipation branch) responsible for the header, feeding, and threshing will immediately increase.

[0044] Instead of waiting for the motor temperature to rise before reacting, the control module proactively increases the speed of the water pump (first or second pump) responsible for that branch by one or more speed levels to increase the coolant flow and actively prepare for the upcoming thermal shock.

[0045] As the high load continues, the engine coolant temperature and the low-temperature radiator outlet temperature begin to rise. The control module comprehensively compares the requests from the engine, the motor circuit, and the condenser to the fan, and takes the maximum value among the three as the command to control the fan to reach the required opening degree, ensuring that all heat sources can be effectively dissipated.

[0046] Scenario 2: Start-up and Operation in Cold Weather The driver needs heating (cabin heating request), and the power battery needs to be heated to ensure charging and discharging performance due to its low temperature (battery heating request).

[0047] The control module reads the engine coolant temperature. If the temperature has reached the first preset threshold, it enters the single-engine waste heat heating mode, fully utilizing waste heat. The control valve assembly activates, causing the engine's high-temperature coolant to flow through the primary side of the water-to-water heat exchanger to heat the battery circuit; simultaneously, it flows to the heater core in the air conditioning unit to heat the cab. The entire process does not require turning on the power-consuming heater, saving energy.

[0048] Scenario 3: Working in high temperatures The battery pack requires cooling due to excessively high temperatures during high-power charging and discharging; the cab also requires cooling. The control module activates the electric compressor in the cooling circuit. The resulting high-temperature, high-pressure gaseous refrigerant enters the condenser integrated in the cooling pack, where it dissipates heat and condenses under the airflow of a shared fan.

[0049] The liquid refrigerant is split into two paths after passing through the expansion valve. One path flows to the evaporator in the air conditioning circuit to provide cooling for the cab; the other path flows to the refrigerant-water heat exchanger (Chiller) in the battery circuit to cool the circulating coolant in the battery pack. Precise, on-demand distribution of cooling capacity is achieved by opening and closing the second solenoid valve and adjusting the opening of the expansion valve.

[0050] It is understood that the integrated thermal management system provided by this invention simplifies the cooling pack layout, reduces cost and space occupation, and makes the structure more compact by arranging the condenser, low-temperature radiator, and high-temperature radiator side by side and sharing a single fan. This eliminates the need for multiple independent fans and their drive controllers. The use of a dual-pump parallel inlet architecture ensures that the temperature of the coolant in both paths is completely consistent before entering their respective cooling branches. Simultaneously, each pump can be started, stopped, and its speed adjusted independently, providing a structural basis for subsequent grouped temperature control. Numerous motors, controllers, and power distribution modules are divided into two groups based on power consumption characteristics and operational relevance, each supplied with cooling water by an independent pump. This grouped architecture can implement differentiated flow supply according to the differences in heat load of each group under different operating conditions, effectively solving the problem of supply-demand mismatch. It ensures sufficient cooling in high-load branches while reducing flow in low-load branches, achieving on-demand allocation and saving pump energy.

[0051] Engine waste heat is integrated into the overall thermal management system for unified allocation, with selective heat supply achieved through valve components. When the engine coolant temperature is suitable, waste heat can be directly used to heat the battery and / or the cab, achieving waste heat recovery and utilization. This improves the overall energy efficiency of the machine, reduces the frequency of electric heater use, extends pure electric operation time, or reduces fuel consumption. The battery circuit and air conditioning circuit are connected in parallel, allowing for independent or simultaneous heat acquisition, flexibly adapting to the thermal needs of different scenarios.

[0052] The cooling capacity generated by the refrigeration circuit serves both the battery circuit and the air conditioning circuit simultaneously through refrigerant piping, achieving shared cooling capacity. This eliminates the need for separate compressors and condensers for battery cooling and cab air conditioning, reducing the number of core refrigeration components, lowering system complexity and cost, and simplifying the structural layout.

[0053] The control module enables multi-source information sensing and intelligent regulation. First, it determines the fan opening based on the combined heat dissipation needs of the engine, motor circuit, and condenser, using the largest value to ensure that all heat sources do not overheat. Second, it adjusts the corresponding water pump speeds based on the actual internal temperatures of multiple controllers, achieving precise closed-loop feedback control. Crucially, it incorporates information on the amount of harvested grain for load prediction, transforming the thermal management system from a delayed response to proactive preventative cooling. This effectively addresses thermal shocks caused by sudden load changes during harvesting, improving temperature control accuracy and system adaptability, and ensuring that motors and controllers do not overheat or fail during continuous high-load operation.

[0054] Continue reading Figure 1In some embodiments of the present invention, the first heat dissipation branch includes a first series branch and a second series branch, which are connected in parallel and share the water supply of the first water pump. The first series branch is connected to the outlet of the first water pump and includes a first dual main drive controller and a front drive controller connected in series. The outlet of the front drive controller is connected in parallel to the first branch and the second branch. The first branch includes a bridge motor and a cutting table motor connected in series, and the second branch includes a front axle motor and a first fan motor connected in series. The second series branch is connected to the outlet of the first water pump and includes a second dual main drive controller, a range extender controller, and a range extender motor connected in series.

[0055] The flow sequence of the first series branch is as follows: coolant enters from the outlet of the first water pump, first flows through the first dual main drive controller for heat dissipation, then flows into the front drive controller, and finally splits from the outlet of the front drive controller into the parallel first and second branches. In the first branch, the bridge motor and the cutter head motor are connected in series; in the second branch, the front axle motor and the first fan motor are connected in series. After the two branches merge, the coolant flows back to the low-temperature radiator.

[0056] The second series branch is connected in parallel with the first series branch. Its flow path is as follows: the coolant flows sequentially through the second dual main drive controller, the range extender controller and the range extender motor, and then flows back to the low-temperature radiator.

[0057] Once the first water pump starts, the coolant is naturally distributed at the branch points of the pipeline according to the flow resistance characteristics of each branch, or the total flow rate is adjusted by controlling the speed of the first water pump. The design principle of the first series branch is to connect two high-power controllers (the first dual main drive controller and the front drive controller) in series on the main line to ensure sufficient cooling. Then, the four motors are grouped in pairs according to their working functions (one group for the bridge and cutter related to travel drive, and another group for the front axle and the fan) to form parallel branches. The structure can effectively balance the flow distribution of each motor branch.

[0058] The second series branch connects the second dual main drive controller, the range extender controller, and the range extender motor in series. These three components are closely coupled in function (all related to the range extender power generation system). Series cooling can ensure that the power generation system obtains a continuous and sufficient amount of coolant when working under high load.

[0059] This invention, through the series connection of motors and controllers with similar thermal load characteristics and the parallel flow splitting at key nodes, achieves a better match in the flow resistance of each branch, which is beneficial for achieving a natural and balanced distribution of flow. Integrating components with related operational functions (such as driving and power generation systems) into the same cooling series / parallel path facilitates subsequent integration with predictive control strategies.

[0060] Continue reading Figure 1In some embodiments of the present invention, the second heat dissipation branch includes a third series branch and a fourth series branch, which are connected in parallel and share the water supply of the second water pump. The third series branch is connected to the outlet of the second water pump and includes a third dual-drive controller and a fourth dual-drive controller connected in series. The outlet of the fourth dual-drive controller is connected in parallel with the third and fourth branches. The third branch includes a feed motor and a lifting motor connected in series, and the fourth branch includes a power distribution module and a second fan motor connected in series.

[0061] The fourth series branch is connected to the outlet of the second water pump and is set in parallel with the third series branch. The fourth series branch includes a single main drive controller and a rear drive controller set in series. The outlet of the rear drive controller is connected in parallel with the fifth branch and the sixth branch. The fifth branch includes a rear drive motor and a shredding motor set in series. The sixth branch includes a grass discharge motor and a drum motor set in series.

[0062] The flow path of the third series branch is as follows: the coolant first flows through the third dual main drive controller, then enters the fourth dual main drive controller, and then is split from the outlet of the fourth dual main drive controller into the parallel third and fourth branches. In the third branch, the feed motor and the lifting motor are connected in series; in the fourth branch, the power distribution module and the second fan motor are connected in series.

[0063] The flow path of the fourth series branch is as follows: the coolant first flows through the single main drive controller, then enters the rear drive controller, and then splits from the outlet of the rear drive controller into the parallel fifth and sixth branches. In the fifth branch, the rear drive motor and the shredder motor are connected in series; in the sixth branch, the straw discharge motor and the drum motor are connected in series.

[0064] The third series branch brings together components related to material conveying and fan cooling. The power distribution unit (PDU), as a heat source, is incorporated into the cooling circuit. Even non-motor electrical heat-generating components are included in the liquid cooling system for active thermal management. The fourth series branch brings together motors and controllers related to core operating components such as walking drive, threshing, chopping, and straw removal.

[0065] Motors directly related to the harvesting process, such as the feeding motor, lifting motor, drum motor, shredding motor, and straw-discharging motor, are managed under the same water pump (second water pump) along with walking components such as the rear drive motor and rear drive controller. This allows for centralized adjustment of the second water pump's speed to quickly and synchronously respond to changes in the cooling needs of the entire material handling chain and related walking drives when the amount of harvested grain changes (i.e., changes in material handling load).

[0066] Understandably, by centralizing the water supply to all motors and controllers involved in the entire material handling process via a second water pump, when the amount of harvested grain increases, simply increasing the speed of the second water pump can simultaneously enhance the heat dissipation capacity of the entire material chain and related drive chains, resulting in direct and efficient control response. Integrating the power distribution unit (PDU) into the liquid cooling circuit eliminates the safety hazards associated with relying on natural air cooling in traditional designs, ensuring temperature safety under high-power power distribution conditions.

[0067] Continue reading Figure 2 In some embodiments of the present invention, the battery circuit includes a battery pack, a third water pump, and a water-to-water heat exchanger. The battery pack, the third water pump, the secondary side of the refrigerant-to-water heat exchanger, and the secondary side of the water-to-water heat exchanger are connected in series to form a circulation loop. The water-to-water heat exchanger is connected in parallel with the air conditioning circuit. The coolant circulates along this series loop under the drive of the third water pump.

[0068] Cooling mode: When the battery pack overheats due to high-power charging and discharging, the cooling circuit activates. Low-temperature refrigerant flows through the primary side of the refrigerant-water heat exchanger, absorbing heat from the secondary side coolant. The cooled coolant then circulates back to the battery pack, carrying away heat from the battery and achieving cooling.

[0069] Heating mode: When the battery pack temperature is too low and heating is required, hot water from the engine or electric heater flows through the primary side of the water-to-water heat exchanger, transferring heat to the battery coolant on the secondary side. The heated coolant circulates back to the battery pack to warm up the battery.

[0070] With this configuration, the battery pack requires only one circulation loop and one water pump to simultaneously meet both cooling and heating needs, avoiding the problems of pipe duplication and component redundancy that would result from setting up separate cooling and heating loops. By controlling the on / off state of the refrigerant loop or the heat source side, the heating and cooling modes can be switched without altering the battery-side piping connections.

[0071] Continue reading Figure 2 In some embodiments of the present invention, the engine circuit includes an engine water jacket and an engine water pump connected in series, the outlet of the engine water jacket is connected in series to the first opening of the valve assembly, and the primary side of the water-to-water heat exchanger is connected in series to the second opening of the valve assembly.

[0072] Essentially, based on the above embodiments, the specific configuration of the engine circuit and its connection relationship with the valve assembly and water-to-water heat exchanger are further defined. The engine circuit consists of an engine water jacket and an engine water pump connected in series. The engine water pump drives the coolant to circulate between the engine water jacket and the high-temperature radiator. The outlet of the engine water jacket (i.e., the high-temperature hot water outlet) is connected to the first opening of the valve assembly; the primary side (i.e., the heat source side) of the water-to-water heat exchanger is connected to the second opening of the valve assembly. The valve assembly is located between the two, acting as a switch and distributor for heat transfer.

[0073] When the engine is running and the water temperature rises, the engine water pump pumps out the high-temperature coolant from the engine water jacket. If there is a need for battery heating or cab heating, the control module controls the valve assembly to open the passage between the first and second openings. At this time, the high-temperature coolant flows from the engine water jacket through the valve assembly and enters the primary side of the water-to-water heat exchanger. It transfers heat to the battery circuit coolant on the secondary side through the heat exchange wall. After the heat transfer is completed, the cooled coolant returns to the engine circuit.

[0074] Continue reading Figure 3 In some embodiments of the present invention, the refrigeration circuit includes a compressor, a condenser of a cooling package assembly, and an expansion valve that are connected in a cycle. The refrigeration circuit is connected to the primary side of a refrigerant-water heat exchanger and the evaporator of an air conditioning circuit through refrigerant pipelines, respectively. The refrigerant-water heat exchanger and the evaporator are arranged in parallel. The refrigerant distribution is controlled by a second solenoid valve and an expansion valve.

[0075] The refrigerant-water heat exchanger and the evaporator of the air conditioning circuit are connected in parallel, and the refrigerant distribution is controlled by a second solenoid valve and an expansion valve.

[0076] Essentially, this embodiment of the invention, based on the aforementioned battery circuit including a refrigerant-water heat exchanger, defines the specific structure of the refrigeration circuit and its connection relationship with the battery circuit and the air conditioning circuit. The refrigeration circuit consists of a compressor, the aforementioned condenser, a second solenoid valve, an expansion valve, and the refrigerant-water heat exchanger, all connected in a refrigerant pipeline. A key feature is that the refrigerant-water heat exchanger (serving battery pack cooling) and the evaporator of the air conditioning circuit (serving cab cooling) are arranged in parallel within the refrigeration circuit. The flow direction and distribution ratio of the system refrigerant are controlled by opening and closing the second solenoid valve and adjusting the opening degree of each branch expansion valve.

[0077] When cooling is required, the compressor operates, compressing the low-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gaseous state. The refrigerant then flows through the condenser and condenses into a liquid state, which flows to the parallel branch point.

[0078] If only the battery needs cooling, the second solenoid valve opens the refrigerant-water heat exchanger branch and closes the evaporator branch; if only the cab needs cooling, the opposite is true; if both need cooling, both branches are opened, and the refrigerant flow is distributed as needed by adjusting the opening of their respective expansion valves to achieve precise distribution of cooling capacity.

[0079] This configuration allows one compressor-condenser unit to serve two cooling terminals simultaneously, reducing the number of compressors and condensers required, thus lowering system costs and space requirements. The parallel configuration, combined with the second solenoid valve and expansion valve, enables the two cooling terminals to operate completely independently while flexibly sharing the cooling source, allowing for precise control and preventing interference.

[0080] Continue reading Figure 2 In some embodiments of the present invention, the heating circuit further includes a first solenoid valve and a heating branch, the heating branch being connected in parallel with the engine circuit, and the first solenoid valve being connected between the engine circuit and the heating branch.

[0081] Essentially, this embodiment of the invention adds a heating branch to the existing engine waste heat utilization path. This heating branch is connected in parallel with the engine circuit, serving as a second heat source independent of the engine. A first solenoid valve is connected between the engine circuit and the heating branch to control the on / off state of the heating branch.

[0082] When the engine coolant temperature is insufficient to provide effective heat, or when the engine is completely stopped, the engine circuit alone cannot meet the heating requirements. At this time, the first solenoid valve opens, activating the heating branch, which independently generates heat and supplies it to the battery circuit and / or air conditioning circuit via the valve assembly. Because the heating branch is connected in parallel with the engine circuit, both can operate independently or simultaneously.

[0083] When the engine has waste heat, it prioritizes the use of waste heat; when there is no waste heat or insufficient waste heat, the heating branch provides supplementary heating. This ensures that the harvester can obtain reliable heating capacity under any operating conditions (cold start, pure electric operation, low engine load, etc.). Even if one component fails, the other can serve as an emergency heat source to maintain basic heating function.

[0084] Continue reading Figure 2 In some embodiments of the present invention, the heating branch includes a heater and a fourth water pump connected in series, the heater being connected to a first solenoid valve and the fourth water pump being connected to an engine circuit.

[0085] Essentially, the core components of the heating branch are a heater (such as a WPTC electric heater) and a fourth water pump connected in series. The heater is connected to the first solenoid valve and is located upstream or midstream of the branch; the fourth water pump is connected to the engine circuit, providing independent water circulation power for the branch.

[0086] When the heating circuit needs to be activated, the first solenoid valve opens, the fourth water pump starts, and drives the coolant circulation within the heating circuit. The coolant is electrically heated as it flows through the heater, then flows to the valve assembly, and is subsequently supplied to the heat-consuming end. The fourth water pump ensures that the heating circuit has independent circulation power, unaffected by the engine water pump's operating status.

[0087] By equipping the heating circuit with a separate fourth water pump, the heating circuit can still independently establish water circulation even when the engine is stopped and the engine water pump is not working, ensuring the integrity of the heating function in pure electric mode or after the engine is turned off. Using an electric heater to directly heat the coolant, coupled with an independent water pump drive, allows for rapid establishment of hot water circulation, shortening the warm-up waiting time.

[0088] In some embodiments of the present invention, the air conditioning circuit includes an air conditioning unit, which contains an evaporator and a heater core. The evaporator is connected to the refrigeration circuit, and the heater core is selectively connected to the engine circuit or the heating branch through a valve assembly to obtain heat.

[0089] The cab houses the air conditioning unit, which integrates two heat exchangers: an evaporator and a heater core. The evaporator is connected to the refrigeration circuit and is the end of the refrigeration cycle; the heater core is selectively connected to the engine circuit or heating branch via a valve assembly and is the end of the heating cycle. A blower blows cold or warm air into the cab through the evaporator or heater core.

[0090] In cooling mode: the cooling circuit works, the low-temperature refrigerant flows through the evaporator, and the blower delivers air through the evaporator to be cooled and dehumidified before being sent into the cab.

[0091] In heating mode: The valve assembly, according to the instructions of the control module, directs hot water from the engine circuit (when there is sufficient residual heat) or the heating branch (when there is insufficient residual heat) into the heater core. The blower then delivers heated air into the cab after passing through the heater core.

[0092] The air conditioning unit integrates an evaporator and a heater core, achieving complete cooling and heating functions without increasing the space occupied in the driver's cabin. Furthermore, the heater core can automatically switch heat sources based on heat availability, prioritizing the use of engine waste heat for heating, thus reducing energy consumption for heating in winter.

[0093] See Figure 5 and Figure 6 The present invention also provides an integrated thermal management control method, applied to the integrated thermal management system of any of the above embodiments, comprising the following steps: Step S100: Obtain the engine coolant temperature, the inlet and outlet water temperatures of the low-temperature radiator, and the refrigerant exhaust temperature. Determine the engine's requested fan opening degree based on the engine coolant temperature, determine the motor circuit's requested fan opening degree based on the low-temperature radiator's inlet and outlet water temperatures, and determine the condenser's requested fan opening degree based on the refrigerant exhaust temperature. Take the maximum value to control the actual fan opening degree.

[0094] Understandably, this step acquires three types of temperature signals in parallel: engine coolant temperature, the temperature difference between the inlet and outlet of the low-temperature radiator or its highest temperature, and the refrigerant system exhaust temperature. These three are then mapped to their respective requests for the cooling fan's opening degree. Finally, the maximum value of the three requests is taken as the actual control command for the fan.

[0095] Specifically, the fan blade angle control is based on the engine coolant temperature to determine the engine's requested fan opening degree; based on the inlet and outlet temperatures of the low-temperature radiator to determine the cooling branch's requested fan opening degree; and based on the exhaust temperature in the refrigeration circuit to determine the condenser's requested fan opening degree; the maximum value of each demand is taken to execute the actual fan control.

[0096] Step S200: Obtain the internal temperature of multiple motors and multiple controllers, control the speed of the first and second water pumps according to the internal temperature, obtain the harvested grain amount information of the harvester, predict the increase of the load of the related motors when the harvested grain amount increases, and increase the speed of the corresponding water pump in advance.

[0097] Understandably, this step involves two parallel control inputs: One method is feedback control, which involves acquiring the real-time internal temperature of each motor and multiple controllers, and adjusting the speed of the water pump responsible for that component's branch accordingly. In other words, based on the internal temperature of the motors and controllers, multi-speed control of the water pump is achieved; if the temperature of a particular motor or multiple controllers rises, the water pump flow rate is automatically increased.

[0098] As a preferred implementation, the control module has a pre-stored temperature-speed mapping table, wherein when the internal temperature of the motor is in the first range, the corresponding water pump is controlled to run at the first speed; when it is in the second range, it runs at the second speed.

[0099] The second method is feedforward predictive control, which involves acquiring information about the amount of grain harvested by the harvester. When an increase in grain quantity is detected, the water pump speed of the branch containing the motor related to material handling is proactively increased before the actual temperature rises. In other words, based on the amount of grain harvested at the front end, the system automatically determines which circuit's working motor load will increase and controls the water pump flow rate to increase in advance for pre-cooling.

[0100] Step S300: Obtain the heating request signal and engine coolant temperature, and determine the heating mode: When the engine coolant temperature is higher than the first preset threshold (e.g., set to 80°C) and there is a heating request, the control enters the single engine waste heat heating mode. When the engine coolant temperature falls below the second preset threshold (e.g., set to 50°C) or the engine stops, the control switches to single heater heating mode. Specifically, the heater starts working, the fourth water pump circulates the water circuit, and the first solenoid valve closes.

[0101] When the engine coolant temperature is between the first preset threshold and the second preset threshold, the system switches to a dual-source heating mode for both the engine and the heater.

[0102] Understandably, this step involves acquiring a heating request signal (from the cab or battery management system) and the current engine coolant temperature. The engine coolant temperature is compared to a preset first threshold (e.g., 80°C, indicating sufficient residual heat) and a second threshold (e.g., 50°C, indicating insufficient residual heat). When the coolant temperature is above the first threshold, a single-engine residual heat heating mode is entered, fully utilizing waste heat; when the coolant temperature is below the second threshold or the engine is stopped, a single-heater heating mode is entered, relying entirely on the electric heater; when the coolant temperature is between the two, a dual-source heating mode is entered, with engine waste heat and the electric heater working together to provide heat.

[0103] The design principle of this control method lies in establishing an optimal control strategy under multiple inputs and constraints. Fan control adopts the maximum value principle, which is essentially a safety-first decision logic: the fan opening must meet the requirements of the party with the greatest heat dissipation demand, ensuring that any heat source receives sufficient cooling airflow, fundamentally preventing local overheating.

[0104] The water pump control incorporates feedforward prediction based on feedback control, solving the problem of response lag in large inertia temperature control systems. The amount of harvested grain is a leading indicator of heat load. By predicting the heat load based on the amount of grain, the control action can be shifted from responding only after the temperature rises to being prepared when the load is about to arrive, thus improving the dynamic quality of temperature control.

[0105] The heating mode determination adopts a logically clear layered threshold method, which quantifies the continuously changing engine water temperature into three intervals, each corresponding to a distinct heating mode. When there is sufficient residual heat, the waste heat is fully utilized, and when there is insufficient residual heat, supplementary heating is provided. This avoids the drawbacks of extensive all-electric heating or insufficient heating from all residual heat, and maximizes energy utilization efficiency.

[0106] Furthermore, in the single-engine waste heat heating mode: When only the battery pack requests heating, the valve assembly is controlled to circulate hot water from the engine water jacket through the primary side of the water-to-water heat exchanger to heat the battery circuit.

[0107] Specifically, when the engine coolant temperature exceeds the limit and only the battery pack requests heating, such as Figure 2 As shown, the first and third openings of the three-way valve are connected, while the second opening is closed. The engine water pump drives the engine water circuit circulation, and the third water pump drives the battery pack water circuit circulation. The two circulating water circuits exchange heat through a water-to-water heat exchanger.

[0108] When only the driver's cab requests heating, the valve assembly is controlled to allow hot water to flow through the heater core of the air conditioning unit. Specifically, when only the driver's cab requests heating, the first and second openings of the three-way valve are connected, and the third opening is closed. The engine water pump drives the water circuit to circulate for heating.

[0109] When both the battery pack and the cab require heating, the control valve assembly allows hot water to flow simultaneously through the primary side of the water-to-water heat exchanger and the heating core of the air conditioning unit. Specifically, when both the cab and the battery pack require heating, the first, second, and third openings of the three-way valve are all connected, allowing waste heat from the engine to heat both circuits.

[0110] In essence, this embodiment of the invention further refines the single-engine waste heat heating mode. Based on the different sources of the heating request, it is divided into three sub-modes: Battery heating request only: The control valve assembly opens the passage from the engine water jacket to the primary side of the water-to-water heat exchanger. Hot water flows only through the water-to-water heat exchanger, transferring heat to the battery circuit coolant. The air conditioning side passage is closed.

[0111] Cab heating request only: The control valve assembly opens the passage from the engine water jacket to the heater core, and hot water flows only through the heater core to heat the cab. The battery side passage is closed.

[0112] Both requests are made simultaneously: the control valve assembly simultaneously opens both paths, and hot water flows proportionally through the water-to-water heat exchanger and the heater core, simultaneously meeting the heating needs of the battery and the cab.

[0113] This control logic embodies the principle of on-demand heat distribution. The valve assembly, acting as an actuator, receives commands from the control module and directs heat by changing the position of its internal valve core. Heat is supplied centrally for single-demand situations and distributed in parallel for dual-demand situations. The flow of hot water is controlled according to actual demand; branches are closed when there is no demand, reducing unnecessary heat loss and pipeline heat dissipation.

[0114] This invention also provides a harvester, including the integrated thermal management system provided in any of the above embodiments. The harvester can be a combine harvester, silage harvester, cotton harvester, or other types of harvesters. The integrated thermal management system is installed on the harvester according to the structure described above. Its cooling pack is arranged in the engine compartment or a dedicated heat dissipation compartment, the air conditioning unit is installed in the cab, and each heat dissipation branch is arranged along the frame to each motor and controller. The control module can be integrated into the vehicle controller or installed as an independent thermal management controller.

[0115] When the harvester is working in the field, the engine runs continuously to provide power, and dozens of motors perform their respective functions to drive the machine through various operations such as walking, harvesting, conveying, threshing, cleaning, and chopping. The integrated thermal management system operates according to the aforementioned working processes and design principles, providing comprehensive thermal management support for the entire machine.

[0116] After being equipped with this integrated thermal management system, the harvester's overall energy efficiency is improved due to reduced energy consumption and waste heat recovery, allowing it to complete more work under the same fuel or electricity conditions. Core power components such as the motor, controller, and battery pack are temperature-controlled under all operating conditions, ensuring their operating temperature remains within a safe range, reducing issues such as insulation aging, power limitation, and lifespan reduction caused by overheating. Even under extreme conditions such as high temperatures and large feed rates, the thermal management system provides sufficient heat dissipation and timely predictive cooling, ensuring the harvester can operate continuously at high loads without power reduction or shutdown, thus improving operational efficiency and reliability.

[0117] The present invention also provides an electronic device, which may include: a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus. The processor may call logical instructions in the memory to execute an integrated thermal management control method, the method including steps S100 to S300.

[0118] Furthermore, the logical instructions in the aforementioned memory can be implemented as software functional units and sold or used as independent products, and can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0119] On the other hand, the present invention also provides a computer program product, the computer program product including a computer program, the computer program being stored on a non-transitory computer-readable storage medium, and when the computer program is executed by a processor, the computer is able to execute the integrated thermal management control method provided by the above methods, the method including: steps S100 to S300.

[0120] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to perform the integrated thermal management control method provided by the above methods, the method comprising: steps S100 to S300.

[0121] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. 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 the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0122] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0123] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An integrated thermal management system, characterized in that, include: The cooling pack assembly includes a condenser, a low-temperature radiator, and a high-temperature radiator arranged side by side, wherein the condenser, the low-temperature radiator, and the high-temperature radiator share a fan driven by the engine; The motor control cooling circuit includes: The inlets of the first and second water pumps are connected in parallel to the inlet of the low-temperature radiator. The first heat dissipation branch is connected to the outlet of the first water pump, and the first heat dissipation branch includes multiple motors and multiple controllers; The second heat dissipation branch is connected to the outlet of the second water pump. The second heat dissipation branch includes multiple motors, multiple controllers, and a power distribution module. The heating circuit includes a battery circuit, an air conditioning circuit, and an engine circuit. The battery circuit and the air conditioning circuit are connected in parallel. The engine circuit is circulatedly connected to the high-temperature radiator. The engine circuit is also connected to the battery circuit and the air conditioning circuit through a valve assembly to selectively supply engine heat to the battery circuit and / or the air conditioning circuit. The refrigeration circuit is cyclically connected to the condenser, the battery circuit, and the air conditioning circuit; The control module is configured to: acquire the engine water temperature, the inlet and outlet water temperatures of the low-temperature radiator and the refrigerant exhaust temperature, as well as the internal temperatures of the plurality of motors and controllers; control the actual opening degree of the fan based on the corresponding temperatures, and control the speed levels of the first water pump and the second water pump based on the internal temperatures; and acquire information on the amount of grain harvested by the harvester, and predict the load changes of the associated motors based on the information on the amount of grain harvested, so as to increase the speed level of the corresponding water pump in advance.

2. The integrated thermal management system according to claim 1, characterized in that, The first heat dissipation branch includes: The first series branch is connected to the outlet of the first water pump. The first series branch includes a first dual main drive controller and a front drive controller arranged in series. The outlet of the front drive controller is connected in parallel with the first branch and the second branch. The first branch includes a bridge motor and a cutting table motor arranged in series. The second branch includes a front axle motor and a first fan motor arranged in series. The second series branch is connected to the outlet of the first water pump and is set in parallel with the first series branch. The second series branch includes a second dual main drive controller, a range extender controller and a range extender motor set in series.

3. The integrated thermal management system according to claim 1, characterized in that, The second heat dissipation branch includes: The third series branch is connected to the outlet of the second water pump. The third series branch includes a third dual main drive controller and a fourth dual main drive controller connected in series. The outlet of the fourth dual main drive controller is connected in parallel with the third branch and the fourth branch. The third branch includes a feed motor and a lifting motor connected in series. The fourth branch includes a power distribution module and a second fan motor connected in series. The fourth series branch is connected to the outlet of the second water pump and is set in parallel with the third series branch. The fourth series branch includes a single main drive controller and a rear drive controller set in series. The outlet of the rear drive controller is connected in parallel with a fifth branch and a sixth branch. The fifth branch includes a rear drive motor and a shredding motor set in series. The sixth branch includes a grass discharge motor and a drum motor set in series.

4. The integrated thermal management system according to claim 1, characterized in that, The refrigeration circuit includes a compressor, the condenser, and an expansion valve connected in a cycle. The refrigeration circuit is connected to the primary side of the refrigerant-water heat exchanger and the evaporator of the air conditioning circuit through refrigerant pipelines. The refrigerant-water heat exchanger and the evaporator are arranged in parallel. The refrigerant distribution is controlled by a second solenoid valve and the expansion valve.

5. The integrated thermal management system according to claim 4, characterized in that, The battery circuit includes a battery pack, a third water pump, and a water-to-water heat exchanger. The battery pack, the third water pump, the secondary side of the refrigerant-to-water heat exchanger, and the secondary side of the water-to-water heat exchanger are connected in series to form a circulation loop. The water-to-water heat exchanger is connected in parallel with the air conditioning circuit.

6. The integrated thermal management system according to claim 5, characterized in that, The engine circuit includes an engine water jacket and an engine water pump connected in series; The outlet of the engine water jacket is connected in series with the first opening of the valve assembly; The primary side of the water-to-water heat exchanger is connected in series at the second opening of the valve assembly.

7. The integrated thermal management system according to any one of claims 1 to 6, characterized in that, The heating circuit also includes a first solenoid valve and a heating branch, the heating branch being connected in parallel with the engine circuit, and the first solenoid valve being connected between the engine circuit and the heating branch.

8. The integrated thermal management system according to claim 7, characterized in that, The heating branch includes a heater and a fourth water pump connected in series; The heater is connected to the first solenoid valve, and the fourth water pump is connected to the engine circuit.

9. The integrated thermal management system according to claim 7, characterized in that, The air conditioning circuit includes an air conditioning unit, which contains an evaporator and a heating core. The evaporator is connected to the refrigeration circuit; The heater core is selectively connected to the engine circuit or the heating branch through the valve assembly to obtain heat.

10. An integrated thermal management control method, applied to an integrated thermal management system as described in any one of claims 1 to 9, characterized in that, Includes the following steps: The engine coolant temperature, the inlet and outlet water temperatures of the low-temperature radiator, and the refrigerant exhaust temperature are obtained. Based on the engine coolant temperature, the requested fan opening degree of the engine is determined. Based on the inlet and outlet water temperatures of the low-temperature radiator, the requested fan opening degree of the motor circuit is determined. Based on the refrigerant exhaust temperature, the requested fan opening degree of the condenser is determined. The maximum value is used to control the actual fan opening degree. The internal temperatures of the multiple motors and multiple controllers are obtained, and the speed levels of the first and second water pumps are controlled according to the internal temperatures. The harvested grain amount information of the harvester is also obtained. When the harvested grain amount increases, the load of the associated motors is predicted to increase, and the speed level of the corresponding water pump is increased in advance. Obtain the heating request signal and the engine coolant temperature, and determine the heating mode: When the engine coolant temperature is higher than the first preset threshold and a heating request is made, the system is controlled to enter the single engine waste heat heating mode. When the engine coolant temperature is lower than the second preset threshold or the engine stops, the control enters the single heater heating mode. When the engine coolant temperature is between the first preset threshold and the second preset threshold, the system is controlled to enter the dual-source heating mode of the engine and heater.

11. The integrated thermal management control method according to claim 10, characterized in that, When entering single-engine waste heat heating mode: When only the battery pack has a heating request, the valve assembly is controlled to circulate hot water from the engine water jacket through the primary side of the water-to-water heat exchanger to heat the battery circuit. When only the driver's cab requests heating, the valve assembly is controlled to allow hot water to flow through the heating core of the air conditioning unit; When both the battery pack and the cab request heating, the valve assembly is controlled to allow hot water to flow simultaneously through the primary side of the water-to-water heat exchanger and the heating core of the air conditioning unit.

12. A harvester, characterized in that, Including the integrated thermal management system as described in any one of claims 1 to 9.

Images