A modular integrated tractor thermal management method and electro-hydraulic control cooling system

Abstract

This invention relates to the field of tractor cooling technology, specifically a modular integrated tractor thermal management method, comprising: centrally arranging the engine radiator, condenser, oil cooler, and hydraulic radiator on the air outlet side of a cooling fan with adjustable blade angle; when the tractor is operating, collecting actual temperature data from the engine cooling module, transmission system cooling module, hydraulic system cooling module, and air conditioning system cooling module; acquiring preset temperature difference data and preset fan speed data corresponding to this operating condition; calculating the actual temperature difference value corresponding to the preset temperature difference value; and judging the magnitude of each actual temperature difference value and the corresponding preset temperature difference value in real time, controlling the airflow direction and speed of the cooling fan in real time based on the judgment result. This invention also provides an electro-hydraulic control cooling system applying the above-described thermal management method. This invention provides cooling and self-cleaning of each tractor radiator through reverse airflow, reducing power loss and energy consumption.

Description

Technical Field

[0001] This invention relates to the field of tractor heat dissipation technology, specifically a modular integrated tractor thermal management method and an electro-hydraulic control heat dissipation system. Background Technology

[0002] With social development and continuous advancements in agricultural production technology, users are increasingly demanding higher operational efficiency, quality, technical and economic performance from tractors, as well as greater operational comfort and intelligent system integration. Traditional tractor cooling systems suffer from complex and dispersed layouts, including engine water radiators, air radiators, transmission oil radiators, hydraulic system radiators, and air conditioning radiators. In particular, the cooling fans are often fixed and directly connected to the engine's power output pulley, failing to detect real-time cooling needs under different operating conditions such as engine rated speed, maximum power speed, and maximum torque point. This prevents timely and dynamic adjustments to airflow and cooling capacity, hindering efficient cooling and adaptability to varying temperature environments and workloads across different tractor subsystems. Furthermore, excessive dust, straw, and stalks in the tractor's operating environment, coupled with the inability to clean them promptly or the inconvenience of user cleanliness, further deteriorates the cooling system's performance. This prevents the engine from consistently operating within its optimal temperature range, hindering the optimal power-economy balance and ultimately impeding overall tractor efficiency and energy conservation.

[0003] Currently, patent CN108150273B discloses an intelligent thermal management system for agricultural machinery and a method for thermal management using this system. This patent discloses a unified approach to thermal management, using two fans, a main fan and an auxiliary fan, to manage the heat dissipation of multiple radiators on the agricultural machinery. However, due to the large number of components arranged in front of the main fan, the components are relatively scattered, making it difficult for the main fan to achieve comprehensive management of multiple radiators. Adding an auxiliary fan results in a complex control mode. At the same time, this patent still does not solve the problem of cleaning the heat dissipation system. Summary of the Invention

[0004] In response to the problems raised in the background technology, the purpose of this invention is to propose a modular integrated tractor thermal management method and an electro-hydraulic control cooling system. This method comprehensively manages the various cooling modules of the tractor through a modular integrated approach, solving the problems of poor management efficiency and inability to comprehensively manage the various subsystems of the tractor as a whole due to the dispersed arrangement of the cooling modules in traditional tractors.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A modular integrated thermal management method for tractors includes the following steps:

[0007] Step 1. The engine radiator, condenser, oil cooler, and hydraulic radiator are arranged together on the air outlet side of the adjustable fan blades. The fan blade angle is controlled by a hydraulic solenoid reversing valve, which is controlled by the controller of the control module. The controller of the control module also controls the speed of the cooling fan. The engine radiator is an integrated unit consisting of an air-cooled intercooler and a water-cooled radiator.

[0008] Step 2: When the tractor is in working condition, the temperature data acquisition unit collects the actual temperature data of the engine cooling module, transmission system cooling module, hydraulic system cooling module, and air conditioning system cooling module respectively.

[0009] Step 3: The controller of the control module acquires the preset temperature difference data and preset fan speed data corresponding to the working condition. The preset temperature difference data includes △T1F1, △T1F2, △T1C, △T1Y and △T1K. The preset fan speed data includes SF1 corresponding to △T1F1, SF2 corresponding to △T1F2, SC corresponding to △T1C, SY corresponding to △T1Y and SK corresponding to △T1K. △T1F1 is the preset temperature difference between the air inlet and outlet air temperature of the air-cooled intercooler of the engine radiator. △T1F2 is the preset temperature difference between the inlet and outlet water temperature of the water-cooled radiator of the engine radiator. △T1C is the preset temperature difference between the inlet and outlet oil temperature of the oil cooler. △T1Y is the preset temperature difference between the inlet and outlet oil temperature of the hydraulic oil cooler. △T1K is the preset temperature difference between the outlet and inlet water temperature of the tractor air conditioning box.

[0010] Step 4: The controller of the control module calculates the actual temperature difference corresponding to the preset temperature difference value. The actual temperature difference value includes △T2F1 corresponding to △T1F1, △T2F2 corresponding to △T1F2, △T2C corresponding to △T1C, △T2Y corresponding to △T1Y, and △T2K corresponding to △T1K. △T2F1 is the actual temperature difference between the air inlet and outlet air temperature of the air-cooled intercooler of the engine radiator. △T2F2 is the actual temperature difference between the inlet and outlet water temperature of the water-cooled radiator of the engine radiator. △T2C is the actual temperature difference between the inlet and outlet oil temperature of the oil cooler. △T2Y is the actual temperature difference between the inlet and outlet oil temperature of the hydraulic oil cooler. △T2K is the actual temperature difference between the outlet and inlet water temperature of the tractor air conditioning box.

[0011] Step 5: The controller of the control module determines the magnitude of each actual temperature difference value and the corresponding preset temperature difference value in real time, and controls the airflow direction and speed of the cooling fan in real time according to the determination result.

[0012] Step 5 is as follows: The controller of the control module determines the magnitude of each actual temperature difference value and the corresponding preset temperature difference value in real time. If only one actual temperature difference value is greater than or equal to the corresponding preset temperature difference value, the controller of the control module sends a response command to the cooling fan to adjust the fan blade angle and adjust the cooling fan speed to the preset fan speed corresponding to the preset temperature difference value, so that the cooling fan blows air in the forward direction to dissipate heat.

[0013] If two or more actual temperature difference values ​​are greater than or equal to the corresponding preset temperature difference values, the controller of the control module will select the maximum speed from the preset fan speeds corresponding to the two or more preset temperature difference values, and the controller of the control module will issue a response command to the cooling fan and adjust the cooling fan speed to the maximum speed so that the cooling fan blows air in the forward direction to dissipate heat.

[0014] If the actual temperature difference is less than the corresponding preset temperature difference, the controller of the control module sends a response command to the cooling fan to adjust the fan blade angle and adjust the cooling fan speed to the first preset speed, so that the cooling fan blows air in reverse to remove dust; the first preset speed is the maximum value among SF1, SF2, SC, SY and SK.

[0015] The present invention also provides an electro-hydraulic control cooling system applying the thermal management method described above, comprising an engine cooling module, a transmission system cooling module, a hydraulic system cooling module, an air conditioning system cooling module, a cooling fan module, and a control module. The engine cooling module has an engine radiator, the transmission system cooling module has an oil cooler, the hydraulic system cooling module has a hydraulic radiator, and the air conditioning system cooling module has a condenser. The cooling fan module includes a cooling fan with adjustable blade angle and a hydraulic solenoid directional valve, the hydraulic solenoid directional valve controlling the blade angle of the cooling fan and connected to the control module.

[0016] The engine radiator and condenser are arranged sequentially from front to back on the air outlet side of the cooling fan, and the oil cooler and hydraulic cooler are arranged side by side between the engine radiator and the condenser; the engine radiator is an integrated unit consisting of an air-cooled intercooler and a water-cooled radiator.

[0017] The control module includes a controller, a temperature data acquisition unit, and a pressure data acquisition unit. The controller is connected to the engine cooling module, the transmission system cooling module, the hydraulic system cooling module, and the air conditioning system cooling module through the temperature data acquisition unit. The controller is also connected to the air conditioning system cooling module through the pressure data acquisition unit. The controller controls the speed and direction of the cooling fan according to the acquired temperature data. The cooling fan simultaneously blows air to cool the engine radiator, the oil cooler, the hydraulic radiator, and the condenser or draws air to remove impurities.

[0018] The air-cooled intercooler of the engine radiator has a first air temperature sensor and a second air temperature sensor connected to its air inlet and outlet, respectively. The water-cooled radiator of the engine radiator has a first water temperature sensor and a second water temperature sensor connected to its water inlet and outlet, respectively.

[0019] The oil cooler is connected to the transmission system oil tank through an oil pipeline, and the oil inlet and outlet of the oil cooler are respectively connected to a first oil temperature sensor and a second oil temperature sensor.

[0020] The hydraulic radiator is connected to the hydraulic oil tank via hydraulic oil pipelines. The hydraulic oil inlet and hydraulic oil outlet of the hydraulic radiator are respectively connected to a third oil temperature sensor and a fourth oil temperature sensor.

[0021] The condenser is connected to the tractor air conditioning box via a compressor. The outlet and inlet of the tractor air conditioning box are respectively connected to a fifth water temperature sensor and a sixth water temperature sensor. The compressor is respectively connected to a first pressure sensor and a second pressure sensor at both ends.

[0022] The first water temperature sensor, the second water temperature sensor, the first air temperature sensor, the second air temperature sensor, the first oil temperature sensor, the second oil temperature sensor, the third oil temperature sensor, the fourth oil temperature sensor, the fifth water temperature sensor, and the sixth water temperature sensor constitute the temperature data acquisition unit of the control module, and the first pressure sensor and the second pressure sensor constitute the pressure data acquisition unit of the control module.

[0023] The engine cooling module includes a water pump, an engine overflow reservoir, an electronic thermostat, and an electronic preheater. The air intake of the air-cooled intercooler is connected to the engine's exhaust pipe outlet, and the exhaust outlet is connected to the engine's turbocharger inlet. The water intake of the water-cooled radiator is connected to the engine's coolant outlet via the water pump, and the water outlet is connected to the engine's coolant return port. The engine overflow reservoir is connected to the first port of the electronic thermostat, and the second port of the electronic thermostat is connected to the engine. The engine's coolant outlet is also connected to the first port of the electronic preheater via the water pump, and the second port of the electronic preheater is connected to the third port of the electronic thermostat. Both the electronic thermostat and the electronic preheater are connected to the controller via wiring harnesses.

[0024] The transmission system cooling module includes a first gear pump and a first electro-hydraulic proportional valve. The first gear pump, the first electro-hydraulic proportional valve, and the oil cooler are connected in sequence through an oil pipeline to form an oil circulation cooling pipeline. The two ends of the oil circulation cooling pipeline are respectively connected to the transmission system oil tank. The first electro-hydraulic proportional valve is connected to the controller.

[0025] The hydraulic system cooling module includes a second gear pump and a second electro-hydraulic proportional valve. The second gear pump, the second electro-hydraulic proportional valve, and the hydraulic radiator are connected in sequence through hydraulic oil pipelines to form a hydraulic oil circulation cooling pipeline. Both ends of the hydraulic oil circulation cooling pipeline are connected to the hydraulic oil tank. The second electro-hydraulic proportional valve is connected to the controller.

[0026] The air conditioning system heat dissipation module includes a heat exchanger and a dryer storage tank. The first end of the heat exchanger is connected to the tractor air conditioning box, and the second end of the heat exchanger is connected to the second end of the dryer storage tank through a first heat dissipation pipe. The first end of the dryer storage tank is connected to the condenser and the compressor in sequence, and the compressor is connected to the third end of the heat exchanger through a second heat dissipation pipe.

[0027] The cooling fan is connected to the power output shaft of the engine, and the power output shaft of the engine drives the cooling fan to rotate. One end of the hydraulic solenoid directional valve is connected to the tractor transmission lubrication system through the first oil circuit, and the other end is connected to the cooling fan through the second oil circuit. The hydraulic solenoid directional valve is connected to the controller through a wiring harness.

[0028] The beneficial effects of this invention are as follows: This invention modularly and orderly arranges the radiators of each subsystem of the tractor in front of the cooling fan. When the cooling fan rotates, air blows across each radiator in sequence, carrying away heat and achieving the cooling effect. Each radiator, arranged modularly and orderly, shares a common cooling fan structure. Integrated thermal management is achieved through a control module, completing the cooling of each tractor radiator and its self-cleaning function via reverse airflow. Dynamic management of the cooling fan by the control module adjusts the fan speed, reducing power loss and energy consumption, and facilitating the integrated layout of the thermal management system. Attached Figure Description

[0029] Figure 1 This is a flowchart of the thermal management method of the present invention.

[0030] Figure 2 This is an overall layout diagram of the electro-hydraulic control heat dissipation system of the present invention.

[0031] Figure 3 This is a schematic diagram of the engine cooling module of the present invention.

[0032] Figure 4 This is a schematic diagram of the heat dissipation module of the transmission system of the present invention.

[0033] Figure 5 This is a schematic diagram of the heat dissipation module of the transmission system of the present invention.

[0034] Figure 6 This is a schematic diagram of the heat dissipation module of the transmission system of the present invention.

[0035] Figure 7 This is a control principle diagram of the present invention.

[0036] Figure 2-7 The components are as follows: 1. Engine radiator, 2. Cooling water pump, 3. Engine, 4. Engine overflow tank, 5. Electronic thermostat, 6. Electronic preheater, 7. First water temperature sensor, 8. Second water temperature sensor, 9. First air temperature sensor, 10. Second air temperature sensor, 11. Transmission system oil tank, 12. First gear pump, 13. First electro-hydraulic proportional valve, 14. Oil cooler, 15. First oil temperature sensor, 16. Second oil temperature sensor, 17. Second gear pump, 18. Second electro-hydraulic proportional valve, 19. Hydraulic radiator, 20. Hydraulic oil tank, 21. Third oil temperature sensor, 22. Fourth oil temperature sensor, 23. Compressor, 24. Condenser, 25. Heat exchanger, 26. Dryer reservoir, 27. Tractor air conditioning unit, 28. First pressure sensor, 29. Second pressure sensor, 30. Fifth water temperature sensor, 31. Sixth water temperature sensor, 32. Cooling fan, 33. Hydraulic solenoid directional valve, 34. Controller.

[0037] Figure 7 In the diagram: the dashed box pointed to by letter A is the engine cooling module, the dashed box pointed to by letter B is the transmission system cooling module, the dashed box pointed to by letter C is the hydraulic system cooling module, the dashed box pointed to by letter D is the air conditioning system cooling module, and the dashed box pointed to by letter E is the cooling fan module. Detailed Implementation

[0038] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0039] like Figure 1 As shown, the present invention first provides a modular integrated tractor thermal management method, comprising the following steps:

[0040] Step 1: The engine radiator 1, condenser 24, oil cooler 14, and hydraulic radiator 19 are arranged together on the air outlet side of the adjustable-blade cooling fan 32. The blade angle of the cooling fan 32 is controlled by the hydraulic solenoid reversing valve 33, which is controlled by the controller 34 of the control module. The controller 34 of the control module also controls the speed of the cooling fan 32. The engine radiator 1 is an integrated unit consisting of an air-cooled intercooler and a water-cooled radiator.

[0041] Step 2: When the tractor is in working condition, the temperature data acquisition unit collects the actual temperature data of the engine cooling module, transmission system cooling module, hydraulic system cooling module, and air conditioning system cooling module respectively.

[0042] Step 3: The controller 34 of the control module acquires the preset temperature difference data and preset fan speed data corresponding to this operating condition. The preset temperature difference data includes △T1F1, △T1F2, △T1C, △T1Y, and △T1K. The preset fan speed data includes SF1 corresponding to △T1F1, SF2 corresponding to △T1F2, SC corresponding to △T1C, SY corresponding to △T1Y, and SK corresponding to △T1K. △T1F1 is the air-cooled intercooler of the engine radiator 1. The preset temperature difference between the air inlet and outlet of the radiator, △T1F2 is the preset temperature difference between the inlet and outlet water temperatures of the water-cooled radiator of engine radiator 1, △T1C is the preset temperature difference between the inlet and outlet oil temperatures of oil radiator 14, △T1Y is the preset temperature difference between the inlet and outlet oil temperatures of hydraulic radiator 19, and △T1K is the preset temperature difference between the outlet and inlet water temperatures of tractor air conditioning box 27.

[0043] Step 4: The controller 34 of the control module calculates the actual temperature difference value corresponding to the preset temperature difference value. The actual temperature difference value includes △T2F1 corresponding to △T1F1, △T2F2 corresponding to △T1F2, △T2C corresponding to △T1C, △T2Y corresponding to △T1Y, and △T2K corresponding to △T1K. △T2F1 is the actual temperature difference between the air inlet and outlet air temperature of the air-cooled intercooler of the engine radiator 1. △T2F2 is the actual temperature difference between the inlet and outlet water temperature of the water-cooled radiator of the engine radiator 1. △T2C is the actual temperature difference between the inlet and outlet oil temperature of the oil cooler 14. △T2Y is the actual temperature difference between the hydraulic oil inlet and outlet oil temperature of the hydraulic radiator 19. △T2K is the actual temperature difference between the outlet and inlet water temperature of the tractor air conditioning box 27.

[0044] Step 5: The controller 34 of the control module determines the magnitude of the actual temperature difference value and the corresponding preset temperature difference value in real time, and controls the airflow direction and speed of the cooling fan 32 in real time according to the determination result.

[0045] Step 5 is as follows: The controller 34 of the control module determines the magnitude of the actual temperature difference value and the corresponding preset temperature difference value in real time. If only one actual temperature difference value is greater than or equal to the corresponding preset temperature difference value, the controller 34 of the control module sends a response command to the cooling fan 32 to adjust the fan blade angle of the cooling fan 32 and at the same time adjust the speed of the cooling fan 32 to the preset fan speed corresponding to the preset temperature difference value, so that the cooling fan 32 blows air in the forward direction to dissipate heat.

[0046] If there are two or more actual temperature difference values ​​that are greater than or equal to the corresponding preset temperature difference value, the controller 34 of the control module selects the maximum speed S from the preset fan speeds corresponding to the two or more preset temperature difference values, and the controller 34 of the control module sends a response command to the cooling fan 32 and adjusts the speed of the cooling fan 32 to the maximum speed S, so that the cooling fan 32 blows air in the forward direction to dissipate heat.

[0047] If the actual temperature difference is less than the corresponding preset temperature difference, the controller 34 of the control module sends a response command to the cooling fan 32 to adjust the fan blade angle and adjust the speed of the cooling fan 32 to the first preset speed, so that the cooling fan 32 blows air in reverse to remove dust; the first preset speed is the maximum value among SF1, SF2, SC, SY and SK.

[0048] The present invention also provides an electro-hydraulic control heat dissipation system that applies the heat management method described above, comprising: an engine heat dissipation module, a transmission system heat dissipation module, a hydraulic system heat dissipation module, an air conditioning system heat dissipation module, a cooling fan module (with reversible airflow direction for heat dissipation and dust removal for each radiator), and a control module;

[0049] like Figure 2 As shown, the engine radiator 1 of the engine cooling module, the oil cooler 14 of the transmission system cooling module, the hydraulic radiator 19 of the hydraulic system cooling module, and the condenser 24 of the air conditioning system cooling module are modularly and orderly arranged on the air outlet side of the cooling fan module. Each cooling module has a water temperature, oil temperature, or air pressure sensor at both the cooling medium inlet and outlet. Each temperature sensor and the cooling fan module are connected to the controller 34. The modular arrangement of the radiators shares a common cooling fan 32, and integrated thermal management is achieved through the controller 34, completing the cooling of the radiators in each system of the tractor. The engine radiator 1 is an integrated unit combining an air-cooled intercooler and a water-cooled radiator.

[0050] The beneficial effects of the above technical solution are as follows: Various temperature sensors installed at the inlet and outlet of the cooling medium in each heat dissipation module are mainly used to determine the heat dissipation effect. All radiators are arranged in a modular and orderly manner in front of the cooling fan 32. When the cooling fan 32 rotates, air blows across each radiator in sequence, carrying away heat and achieving the heat dissipation effect. Each radiator, arranged in a modular and orderly manner, shares a single cooling fan 32. Integrated thermal management is achieved through the controller 34, completing the heat dissipation of each radiator on the tractor and the reverse airflow cleaning and self-cleaning process. Dynamic management of the cooling fan 32 by the controller 34 adjusts the fan speed, reducing power loss and energy consumption, facilitating the integrated layout of the thermal management system.

[0051] like Figure 3As shown, the engine cooling module includes an engine radiator 1, a water pump 2, an engine overflow reservoir 4, an electronic thermostat 5, and an electronic preheater 6. The air intake of the air-cooled intercooler of the engine radiator 1 is connected to the exhaust outlet of the engine 3, and the exhaust outlet of the air-cooled intercooler is connected to the turbocharger inlet of the engine 3. The water intake of the water-cooled radiator of the engine radiator 1 is connected to the coolant outlet of the engine 3 via the water pump 2, and the water outlet of the water-cooled radiator of the engine radiator 1 is connected to the coolant return port of the engine 3. The engine overflow reservoir 4 is connected to the first end of the electronic thermostat 5. The second port of the electronic thermostat 5 is connected to the engine 3; the cooling water outlet of the engine 3 is also connected to the first port of the electronic preheater 6 via the cooling water pump 2, and the second port of the electronic preheater 6 is connected to the third port of the electronic thermostat 5; the electronic thermostat 5 and the electronic preheater 6 are both connected to the controller 34 via wiring harnesses; the air inlet and outlet of the air-cooled intercooler of the engine radiator 1 are respectively connected to the first air temperature sensor 9 and the second air temperature sensor 10, and the water inlet and outlet of the water-cooled radiator of the engine radiator 1 are respectively connected to the first water temperature sensor 7 and the second water temperature sensor 8.

[0052] The above technical solution works as follows: When the cooling water pump 2 circulates, it generates a certain water pressure, causing the cooling water to flow to the core of the water-cooled radiator 1 and other components requiring heat dissipation for heat exchange, thereby removing heat. The first water temperature sensor 7 and the second water temperature sensor 8, installed at the inlet and outlet of the water-cooled radiator, are used to determine the heat dissipation effect. The engine overflow tank 4 stores excess cooling water. When the water temperature threshold reaches a preset value, the electronic thermostat 4 opens, and cooling water flows to the water-cooled radiator. When the water temperature is low, the cooling water flows to the electronic preheater 6 for preheating, accelerating engine start-up time.

[0053] like Figure 4 As shown, the transmission system cooling module includes an oil cooler 14, a first gear pump 12, and a first electro-hydraulic proportional valve 13. The first gear pump 12, the first electro-hydraulic proportional valve 13, and the oil cooler 14 are connected in sequence through an oil pipeline to form an oil circulation cooling pipeline. The two ends of the oil circulation cooling pipeline are respectively connected to the transmission system oil tank 11. The first electro-hydraulic proportional valve 13 is connected to the controller 34. The oil inlet and oil outlet of the oil cooler 14 are respectively connected to a first oil temperature sensor 15 and a second oil temperature sensor 16.

[0054] The function of the above technical solution is as follows: When the first gear pump 12 is working, it generates oil pressure, causing the hydraulic oil in the transmission system oil tank 11 to flow to the oil cooler 14, where it exchanges heat with the oil cooler 14 and carries away the heat. The first oil temperature sensor 15 and the second oil temperature sensor 16, installed at the oil inlet and oil outlet of the oil cooler 14, are used to determine the heat dissipation effect; the first electro-hydraulic proportional valve 13 is mainly used to adjust the oil flow rate.

[0055] like Figure 5 As shown, the hydraulic system cooling module includes a hydraulic radiator 19, a second gear pump 17, and a second electro-hydraulic proportional valve 18. The second gear pump 17, the second electro-hydraulic proportional valve 18, and the hydraulic radiator 19 are connected in sequence through hydraulic oil pipelines to form a hydraulic oil circulation cooling pipeline. The two ends of the hydraulic oil circulation cooling pipeline are respectively connected to the hydraulic oil tank 20. The second electro-hydraulic proportional valve 18 is connected to the controller 34. The hydraulic oil inlet and hydraulic oil outlet of the hydraulic radiator 19 are respectively connected to the third oil temperature sensor 21 and the fourth oil temperature sensor 22.

[0056] The function of the above technical solution is as follows: When the second gear pump 17 is working, it generates oil pressure, causing the hydraulic oil in the hydraulic oil tank 20 to flow to the hydraulic radiator 19, where it exchanges heat with the radiator and carries away the heat. The third oil temperature sensor 21 and the fourth oil temperature sensor 22, installed at the hydraulic oil inlet and outlet of the hydraulic radiator 19, are used to determine the cooling effect. The second electro-hydraulic proportional valve 18 is mainly used to adjust the hydraulic oil flow rate during hydraulic system cooling, and the hydraulic oil tank 20 is used to store hydraulic oil.

[0057] like Figure 6 As shown, the air conditioning system heat dissipation module includes a compressor 23, a condenser 24, a heat exchanger 25, a dryer storage tank 26, and a tractor air conditioning box 27. The first end of the heat exchanger 25 is connected to the tractor air conditioning box 27, and the second end of the heat exchanger 25 is connected to the second end of the dryer storage tank 26 through a first heat dissipation pipe. The first end of the dryer storage tank 26 is connected to the condenser 24 and the compressor 23 in sequence. The compressor 23 is connected to the third end of the heat exchanger 25 through a second heat dissipation pipe. The outlet and inlet of the tractor air conditioning box 27 are respectively connected to a fifth water temperature sensor 30 and a sixth water temperature sensor 31. The two ends of the compressor 23 are respectively connected to a first pressure sensor 28 and a second pressure sensor 29.

[0058] The function of the above technical solution is as follows: When engine 3 is working, the engine fan pulley transmits power through the belt, driving compressor 23 to work and generating circulating power. This causes the compressed refrigerant to flow to condenser 24 for heat exchange, then enters the drying reservoir 26 for drying. After drying, it continues to expand and cool in the tractor's air conditioning box 27, exchanging heat with the hot air in the cab and carrying away heat. The fifth water temperature sensor 30 and the sixth water temperature sensor 31, installed at the inlet and outlet of the tractor's air conditioning box 27, are used to determine the heat dissipation effect. The first pressure sensor 28 and the second pressure sensor 29, installed at the inlet and outlet of compressor 23, are mainly used to determine the power output of compressor 23.

[0059] The cooling fan module includes a cooling fan 32 with adjustable blade angle and a hydraulic solenoid directional valve 33. The hydraulic solenoid directional valve 33 controls the blade angle of the cooling fan 32 and is connected to a control module. The cooling fan 32 is mounted on the engine's power output shaft and connected to the power output shaft of the engine 3. The power output shaft of the engine 3 drives the cooling fan 32 to rotate. One end of the hydraulic solenoid directional valve 33 is connected to the tractor's transmission lubrication system via a first oil circuit, and the other end is connected to the cooling fan 32 via a second oil circuit. The hydraulic solenoid directional valve 33 is connected to the controller 34 via a wiring harness. In this part of the technical solution, the cooling fan 32 adopts a multi-blade variable angle fan provided by patent CN107503983A. The cooling fan 32's blade angle is controlled by the hydraulic solenoid directional valve 33, which allows the cooling fan 32 to switch between forward and reverse airflow. Correspondingly, the structure of the cooling fan 32 and the hydraulic solenoid directional valve 33 have been disclosed in this patent and will not be described again here.

[0060] The function of the above technical solution is as follows: When the engine 3 is working, the power output shaft of the engine 3 drives the cooling fan 32 to rotate and work. The tractor transmission lubrication system, the hydraulic solenoid reversing valve 33 and the cooling fan 32 form a hydraulic closed system. The hydraulic solenoid reversing valve 33 is controlled by the controller 34, thereby controlling the change of the blade angle of the cooling fan 32.

[0061] like Figure 7 As shown, the first water temperature sensor 7, the second water temperature sensor 8, the first air temperature sensor 9, the second air temperature sensor 10, the first oil temperature sensor 15, the second oil temperature sensor 16, the third oil temperature sensor 21, the fourth oil temperature sensor 22, the fifth water temperature sensor 30, and the sixth water temperature sensor 31 constitute the temperature data acquisition unit of the control module. The first pressure sensor 28 and the second pressure sensor 29 constitute the pressure data acquisition unit of the control module. The temperature data acquisition unit and the pressure data acquisition unit are respectively connected to the controller 34 through wiring harnesses. The electronic thermostat 5, the electronic preheater 6, the first electro-hydraulic proportional valve 13, the second electro-hydraulic proportional valve 18, and the hydraulic solenoid directional valve 33 act as actuators to execute the commands issued by the controller 34.

[0062] The principle of this invention is as follows: various temperature sensors installed at the inlets and outlets of each radiator are mainly used to determine the heat dissipation effect. All radiators are arranged in a modular and orderly manner in front of the cooling fan 32. When the cooling fan 32 rotates, airflow blows across each radiator sequentially, carrying away heat and achieving the heat dissipation effect. All radiators share a single cooling fan 32, and integrated thermal management is achieved through the controller 34 of the control module, completing the heat dissipation of each radiator on the tractor and the reverse airflow cleaning and self-cleaning of the radiators. The controller 34 dynamically manages the cooling fan 32, adjusting its speed to reduce power loss and energy consumption, facilitating the integrated layout of the thermal management system. The corresponding fan speeds required by each radiator under different working conditions are preset. After the engine is cold-started, the controller 34 of the control module controls the cooling fan 32 to not work. At this time, the cooling fan 32 does not rotate. As the tractor enters the working state, the controller 34 of the control module dynamically judges and compares the actual temperature difference value of the temperature sensor at the inlet and outlet of each radiator with the corresponding preset temperature difference value. If any actual temperature difference value reaches the corresponding preset temperature difference value, the controller controls the cooling fan 32 to start accelerating until the cooling fan 32 reaches the preset speed required by the radiator.

[0063] Specifically, referring to the thermal management method and electro-hydraulic control heat dissipation system provided by this invention, different input parameters can be set according to different working conditions of the tractor, so as to achieve more refined management of the tractor heat dissipation system.

[0064] The parts of this invention not described in detail are prior art.

Claims

1. A modular integrated thermal management method for tractors, characterized by: Includes the following steps: Step 1: The engine radiator (1), condenser (24), oil cooler (14) and hydraulic radiator (19) are arranged together on the air outlet side of the cooling fan (32) with adjustable blade angle. The blade angle of the cooling fan (32) is controlled by the hydraulic solenoid reversing valve (33). The hydraulic solenoid reversing valve (33) is controlled by the controller (34) of the control module. The controller (34) of the control module also controls the speed of the cooling fan (32). The engine radiator (1) is an integrated air-cooled intercooler and a water-cooled radiator. Step 2: When the tractor is in working condition, the temperature data acquisition unit collects the actual temperature data of the engine cooling module, transmission system cooling module, hydraulic system cooling module, and air conditioning system cooling module respectively. Step 3: The controller (34) of the control module acquires the preset temperature difference data and preset fan speed data corresponding to the operating condition. The preset temperature difference data includes △T1F1, △T1F2, △T1C, △T1Y and △T1K. The preset fan speed data includes SF1 corresponding to △T1F1, SF2 corresponding to △T1F2, SC corresponding to △T1C, SY corresponding to △T1Y and SK corresponding to △T1K. △T1F1 is the air-cooled intercooler of the engine radiator (1). The preset temperature difference between the air inlet and outlet of the air radiator, △T1F2 is the preset temperature difference between the inlet and outlet water temperature of the water-cooled radiator of the engine radiator (1), △T1C is the preset temperature difference between the inlet and outlet oil temperature of the oil radiator (14), △T1Y is the preset temperature difference between the inlet and outlet oil temperature of the hydraulic oil radiator (19), and △T1K is the preset temperature difference between the outlet and inlet water temperature of the tractor air conditioning box (27). Step 4: The controller (34) of the control module calculates the actual temperature difference value corresponding to the preset temperature difference value. The actual temperature difference value includes △T2F1 corresponding to △T1F1, △T2F2 corresponding to △T1F2, △T2C corresponding to △T1C, △T2Y corresponding to △T1Y and △T2K corresponding to △T1K. △T2F1 is the actual temperature difference between the air inlet temperature and the air outlet temperature of the air-cooled intercooler of the engine radiator (1). △T2F2 is the actual temperature difference between the inlet water temperature and the outlet water temperature of the water-cooled radiator of the engine radiator (1). △T2C is the actual temperature difference between the inlet oil temperature and the outlet oil temperature of the oil radiator (14). △T2Y is the actual temperature difference between the inlet oil temperature and the outlet oil temperature of the hydraulic oil radiator (19). △T2K is the actual temperature difference between the outlet water temperature and the inlet water temperature of the tractor air conditioning box (27). Step 5: The controller (34) of the control module determines the magnitude of each actual temperature difference value and the corresponding preset temperature difference value in real time, and controls the airflow direction and speed of the cooling fan (32) in real time according to the determination result; The specific details of step 5 are as follows: The controller (34) of the control module determines the size of each actual temperature difference value and the corresponding preset temperature difference value in real time. If only one actual temperature difference value is greater than or equal to the corresponding preset temperature difference value, the controller (34) of the control module issues a response command to the cooling fan (32), adjusts the fan blade angle of the cooling fan (32), and adjusts the speed of the cooling fan (32) to the preset fan speed of the corresponding preset temperature difference value, so that the cooling fan (32) blows air in the forward direction to dissipate heat. If there are two or more actual temperature difference values ​​that are greater than or equal to the corresponding preset temperature difference value, the controller (34) of the control module selects the maximum speed S from the preset fan speeds corresponding to the two or more preset temperature difference values, the controller (34) of the control module issues a response command to the cooling fan (32) and adjusts the speed of the cooling fan (32) to the maximum speed S, so that the cooling fan (32) blows air in the forward direction to dissipate heat. If the actual temperature difference is less than the corresponding preset temperature difference, the controller (34) of the control module sends a response command to the cooling fan (32), adjusts the blade angle of the cooling fan (32), and adjusts the speed of the cooling fan (32) to the first preset speed, so that the cooling fan (32) blows air in reverse to remove dust; the first preset speed is the maximum value among SF1, SF2, SC, SY and SK.

2. An electro-hydraulic controlled heat dissipation system applying the thermal management method as described in claim 1, characterized in that: The system includes an engine cooling module, a transmission system cooling module, a hydraulic system cooling module, an air conditioning system cooling module, a cooling fan module, and a control module. The engine cooling module has an engine radiator (1), the transmission system cooling module has an oil cooler (14), the hydraulic system cooling module has a hydraulic radiator (19), and the air conditioning system cooling module has a condenser (24). The cooling fan module includes a cooling fan (32) with adjustable blade angle and a hydraulic solenoid directional valve (33). The hydraulic solenoid directional valve (33) controls the blade angle of the cooling fan (32) and is connected to the control module. The engine radiator (1) and condenser (24) are arranged from front to back on the air outlet side of the cooling fan (32), and the oil cooler (14) and hydraulic cooler (19) are arranged side by side between the engine radiator (1) and condenser (24); the engine radiator (1) is an integrated air-cooled intercooler and a water-cooled radiator. The control module includes a controller (34), a temperature data acquisition unit and a pressure data acquisition unit. The controller (34) is connected to the engine cooling module, the transmission system cooling module, the hydraulic system cooling module and the air conditioning system cooling module through the temperature data acquisition unit. The controller (34) is also connected to the air conditioning system cooling module through the pressure data acquisition unit. The controller (34) controls the speed and direction of the cooling fan (32) according to the collected temperature data. The cooling fan (32) simultaneously blows air to the engine radiator (1), the oil radiator (14), the hydraulic radiator (19) and the condenser (24) for heat dissipation or reverse air blowing for dust removal.

3. The electro-hydraulic controlled heat dissipation system according to claim 2, characterized in that: The air inlet and outlet of the air-cooled intercooler of the engine radiator (1) are respectively connected to a first air temperature sensor (9) and a second air temperature sensor (10), and the water inlet and outlet of the water-cooled radiator of the engine radiator (1) are respectively connected to a first water temperature sensor (7) and a second water temperature sensor (8). The oil cooler (14) is connected to the transmission system oil tank (11) through an oil pipeline. The oil inlet and outlet of the oil cooler (14) are respectively connected to a first oil temperature sensor (15) and a second oil temperature sensor (16). The hydraulic radiator (19) is connected to the hydraulic oil tank (20) through a hydraulic oil pipeline. The hydraulic oil inlet and hydraulic oil outlet of the hydraulic radiator (19) are respectively connected to a third oil temperature sensor (21) and a fourth oil temperature sensor (22). The condenser (24) is connected to the tractor air conditioning box (27) via the compressor (23). The outlet and inlet of the tractor air conditioning box (27) are respectively connected to the fifth water temperature sensor (30) and the sixth water temperature sensor (31); the compressor (23) is respectively connected to the first pressure sensor (28) and the second pressure sensor (29). The first water temperature sensor (7), the second water temperature sensor (8), the first air temperature sensor (9), the second air temperature sensor (10), the first oil temperature sensor (15), the second oil temperature sensor (16), the third oil temperature sensor (21), the fourth oil temperature sensor (22), the fifth water temperature sensor (30), and the sixth water temperature sensor (31) constitute the temperature data acquisition unit of the control module, and the first pressure sensor (28) and the second pressure sensor (29) constitute the pressure data acquisition unit of the control module.

4. The electro-hydraulic controlled heat dissipation system according to claim 2, characterized in that: The engine cooling module includes a water pump (2), an engine overflow tank (4), an electronic thermostat (5), and an electronic preheater (6). The air inlet of the air-cooled intercooler of the engine radiator (1) is connected to the exhaust outlet of the engine (3), and the outlet of the air-cooled intercooler is connected to the turbocharger inlet of the engine (3). The water inlet of the water-cooled radiator of the engine radiator (1) is connected to the cooling water outlet of the engine (3) through the water pump (2). The outlet of the heater is connected to the coolant return port of the engine (3). The engine overflow tank (4) is connected to the first port of the electronic thermostat (5). The second port of the electronic thermostat (5) is connected to the engine (3). The coolant outlet of the engine (3) is also connected to the first port of the electronic preheater (6) through the coolant pump (2). The second port of the electronic preheater (6) is connected to the third port of the electronic thermostat (5). The electronic thermostat (5) and the electronic preheater (6) are both connected to the controller (34) through a wiring harness.

5. The electro-hydraulic controlled heat dissipation system according to claim 2, characterized in that: The transmission system heat dissipation module includes a first gear pump (12) and a first electro-hydraulic proportional valve (13). The first gear pump (12), the first electro-hydraulic proportional valve (13) and the oil cooler (14) are connected in sequence through an oil pipeline to form an oil circulation cooling pipeline. The two ends of the oil circulation cooling pipeline are respectively connected to the transmission system oil tank (11); the first electro-hydraulic proportional valve (13) is connected to the controller (34).

6. The electro-hydraulic controlled heat dissipation system according to claim 2, characterized in that: The hydraulic system cooling module includes a second gear pump (17) and a second electro-hydraulic proportional valve (18). The second gear pump (17), the second electro-hydraulic proportional valve (18) and the hydraulic radiator (19) are connected in sequence through hydraulic oil pipelines to form a hydraulic oil circulation cooling pipeline. The two ends of the hydraulic oil circulation cooling pipeline are respectively connected to the hydraulic oil tank (20); the second electro-hydraulic proportional valve (18) is connected to the controller (34).

7. The electro-hydraulic controlled heat dissipation system according to claim 2, characterized in that: The air conditioning system heat dissipation module includes a heat exchanger (25) and a dry liquid storage tank (26). The first end of the heat exchanger (25) is connected to the tractor air conditioning box (27). The second end of the heat exchanger (25) is connected to the second end of the dry liquid storage tank (26) through a first heat dissipation pipe. The first end of the dry liquid storage tank (26) is connected to the condenser (24) and the compressor (23) in sequence. The compressor (23) is connected to the third end of the heat exchanger (25) through a second heat dissipation pipe.

8. The electro-hydraulic controlled heat dissipation system according to claim 2, characterized in that: The cooling fan (32) is connected to the power output shaft of the engine (3), and the cooling fan (32) is driven to rotate by the power output shaft of the engine (3); one end of the hydraulic solenoid directional valve (33) is connected to the tractor transmission lubrication system through the first oil circuit, and the other end is connected to the cooling fan (32) through the second oil circuit. The hydraulic solenoid directional valve (33) is connected to the controller (34) through the wiring harness.

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