Modularized integrated tractor thermal management method and electro-hydraulic control heat dissipation system

Abstract

The invention relates to the technical field of tractor heat dissipation, in particular to a modular integrated tractor heat management method which comprises the steps that an engine radiator, a condenser, an engine oil radiator and a hydraulic radiator are arranged on the air outlet side of a cooling fan with the fan blade angle adjustable in a centralized mode; when the tractor operates in a working condition state, actual temperature data of an engine heat dissipation module, a transmission system heat dissipation module, a hydraulic system heat dissipation module and an air conditioning system heat dissipation module are collected; preset temperature difference data and preset fan rotating speed data corresponding to the working condition state are obtained; calculating an actual temperature difference value corresponding to the preset temperature difference value; and judging the actual temperature difference value of each item and the corresponding preset temperature difference value in real time, and controlling the wind direction and the rotating speed of the cooling fan in real time according to the judgment result. The invention further provides an electro-hydraulic control heat dissipation system applying the thermal management method. Heat dissipation and reverse blowing cleaning self-cleaning are carried out on all radiators of the tractor, the power loss is reduced, and the energy loss is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of tractor heat dissipation, and in particular to a modular integrated tractor heat management method and an electro-hydraulic controlled heat dissipation system. Background Art

[0002] With the development of society and the continuous advancement of agricultural production technology, users are increasingly demanding higher efficiency, quality, technical, and economic performance from tractor users, with increasing demands for greater operator comfort and intelligent applications throughout the tractor. Traditional tractor cooling systems feature a complex and dispersed layout of cooling modules, including the engine water radiator, air radiator, transmission oil radiator, hydraulic system radiator, and air conditioning radiator. In particular, the cooling fan is often fixed directly to the engine's power output pulley. This lacks real-time sensing of cooling requirements under varying operating conditions, such as the engine's rated speed, maximum power speed, and maximum torque point, and the ability to dynamically adjust wind speed and air volume. Consequently, these systems are unable to effectively utilize cooling capacity and adapt to the varying cooling requirements of the tractor's subsystems due to temperature fluctuations and workloads caused by prolonged, continuous operation. Furthermore, excessive accumulation of dust and grass clippings in the tractor's operating environment can hinder self-cleaning or user convenience, further deteriorating the cooling system's performance. This prevents the engine from consistently operating within the optimal operating temperature range, ensuring optimal power-economy matching, and hindering efficient energy-saving operation of the tractor as a whole.

[0003] At present, patent CN108150273B discloses an intelligent thermal management system for agricultural machinery and a method for thermal management using the system. The patent discloses the idea of ​​unified thermal management and uses main and auxiliary fans to manage the heat dissipation of multiple radiators on agricultural machinery. However, because there are many components arranged in front of the main fan, the components are relatively scattered, and the main fan is difficult to achieve comprehensive management of multiple radiators. After adding an auxiliary fan, there is a problem of complex control mode. At the same time, the patent still does not solve the problem of cleaning the cooling system. Summary of the Invention

[0004] In response to the problems raised in the background technology, the purpose of the present invention is to propose a modular integrated tractor thermal management method and electro-hydraulic control heat dissipation system, which comprehensively manages the various heat dissipation modules of the tractor through a modular integrated mode, thereby solving the problems of poor management efficiency and inability to comprehensively manage the various subsystems of the tractor due to the scattered arrangement of the heat dissipation modules in traditional tractors.

[0005] To achieve the above object, the present invention adopts the following technical solutions: A modular integrated tractor thermal management method comprises the following steps: Step 1. Centrally arrange the engine radiator, condenser, oil radiator, and hydraulic radiator on the air outlet side of a cooling fan with adjustable blade angle. The cooling fan blade angle is controlled by a hydraulic solenoid reversing valve, which is controlled by a controller in a control module. The controller in the control module also controls the cooling fan speed. The engine radiator is an integrated air-cooled intercooler radiator and a water-cooled radiator. Step 2: When the tractor is operating in a working state, the temperature data acquisition unit respectively acquires actual temperature data of the engine cooling module, the transmission system cooling module, the hydraulic system cooling module, and the air conditioning system cooling module; Step 3. The controller of the control module obtains preset temperature difference data and preset fan speed data corresponding to the working condition, the preset temperature difference data including ΔT1F1, ΔT1F2, ΔT1C, ΔT1Y and ΔT1K, and the preset fan speed data including SF1 corresponding to ΔT1F1, SF2 corresponding to ΔT1F2, SC corresponding to ΔT1C, SY corresponding to ΔT1Y and SK corresponding to ΔT1K; ΔT1F1 is the preset temperature difference between the air inlet temperature and the air outlet temperature of the air-cooled intercooler of the engine radiator, ΔT1F2 is the preset temperature difference between the water inlet temperature and the water outlet temperature of the water-cooled radiator of the engine radiator, ΔT1C is the preset temperature difference between the oil inlet temperature and the oil outlet temperature of the oil radiator, ΔT1Y is the preset temperature difference between the hydraulic oil inlet temperature and the hydraulic oil outlet temperature of the hydraulic radiator, and ΔT1K is the preset temperature difference between the water temperature at the outlet end and the water temperature at the inlet end of the tractor air-conditioning box; Step 4. The controller of the control module calculates an actual temperature difference corresponding to the preset temperature difference, where the actual temperature difference includes ΔT2F1 corresponding to ΔT1F1, ΔT2F2 corresponding to ΔT1F2, ΔT2C corresponding to ΔT1C, ΔT2Y corresponding to ΔT1Y, and ΔT2K corresponding to ΔT1K. ΔT2F1 is the actual temperature difference between the air inlet and air outlet temperatures of an air-cooled intercooler of an engine radiator, ΔT2F2 is the actual temperature difference between the water inlet and water outlet temperatures of a water-cooled radiator of an engine radiator, ΔT2C is the actual temperature difference between the oil inlet and oil outlet temperatures of an oil radiator, ΔT2Y is the actual temperature difference between the hydraulic oil inlet and hydraulic oil outlet temperatures of a hydraulic radiator, and ΔT2K is the actual temperature difference between the water temperature at the outlet and the water temperature at the inlet of a tractor air-conditioning box. Step 5: The controller of the control module determines the size of each actual temperature difference value and the corresponding preset temperature difference value in real time, and controls the wind direction and speed of the cooling fan in real time according to the determination result.

[0006] Step 5 is specifically as follows: the controller of the control module determines in real time the size of each actual temperature difference value and the corresponding preset temperature difference value. 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 issues a response instruction to the cooling fan to adjust the fan blade angle of the cooling fan and simultaneously 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; 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 selects 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 sends a response instruction to the cooling fan and adjusts the cooling fan speed to the maximum speed so that the cooling fan blows air in the forward direction to dissipate heat; If the actual temperature difference values ​​are all smaller than the corresponding preset temperature difference values, the controller of the control module sends a response instruction to the cooling fan, adjusts the blade angle of the cooling fan, and adjusts the cooling fan speed to the first preset speed at the same time, 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.

[0007] The present invention also provides an electro-hydraulic controlled heat dissipation system using the above-mentioned thermal management method, 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 heat dissipation fan module, and a control module. The engine heat dissipation module comprises an engine radiator, the transmission system heat dissipation module comprises an oil radiator, the hydraulic system heat dissipation module comprises a hydraulic radiator, and the air conditioning system heat dissipation module comprises a condenser. The heat dissipation fan module comprises a heat dissipation fan with adjustable blade angles and a hydraulic electromagnetic reversing valve. The hydraulic electromagnetic reversing valve controls the blade angle of the heat dissipation fan, and the hydraulic electromagnetic reversing valve is connected to the control module. The engine radiator and condenser are arranged in sequence from front to back on the air outlet side of the cooling fan, and the oil radiator and hydraulic radiator are arranged in parallel between the engine radiator and the condenser; the engine radiator is integrated with an air-cooled intercooler radiator and a water-cooled radiator; 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 respectively 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 wind direction of the cooling fan according to the collected temperature data, and the cooling fan simultaneously blows air to dissipate heat or sucks air to remove impurities to the engine radiator, oil radiator, hydraulic radiator and condenser.

[0008] The air inlet and the air outlet of the air-cooled intercooler radiator of the engine radiator are respectively connected to the first air temperature sensor and the second air temperature sensor, and the water inlet and the water outlet of the water-cooled radiator of the engine radiator are respectively connected to the first water temperature sensor and the second water temperature sensor; The oil radiator is connected to the transmission system oil tank through an oil pipeline, and the oil inlet and oil outlet of the oil radiator are respectively connected to a first oil temperature sensor and a second oil temperature sensor; The hydraulic radiator is connected to the hydraulic oil tank through a hydraulic oil pipeline, and 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; The condenser is connected to the tractor air-conditioning box through a compressor, and the outlet and inlet of the tractor air-conditioning box are respectively connected to the fifth water temperature sensor and the sixth water temperature sensor; the two ends of the compressor are respectively connected to the first pressure sensor and the second pressure sensor; 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 a temperature data acquisition unit of the control module, and the first pressure sensor and the second pressure sensor constitute a pressure data acquisition unit of the control module.

[0009] The engine heat dissipation module includes a cooling water pump, an engine overflow pot, an electronic thermostat and an electronic preheater. The air inlet of the air-cooled intercooler radiator of the engine radiator is connected to the exhaust pipe outlet of the engine, and the air outlet of the air-cooled intercooler radiator is connected to the supercharger inlet of the engine; the water inlet of the water-cooled radiator of the engine radiator is connected to the cooling water outlet of the engine through the cooling water pump, and the water outlet of the water-cooled radiator of the engine radiator is connected to the cooling water return port of the engine. The engine overflow pot is connected to the first port of the electronic thermostat, and the second port of the electronic thermostat is connected to the engine; the cooling water outlet of the engine is also connected to the first port of the electronic preheater through the cooling water pump, and the second port of the electronic preheater is connected to the third port of the electronic thermostat; the electronic thermostat and the electronic preheater are both connected to the controller through a wiring harness.

[0010] The transmission system heat dissipation 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 radiator 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.

[0011] The hydraulic system heat dissipation 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 a hydraulic oil pipeline 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; the second electro-hydraulic proportional valve is connected to the controller.

[0012] The air conditioning system heat dissipation module includes a heat exchanger and a dry liquid storage tank. The first end of the heat exchanger is connected to the tractor air conditioning box, the second end of the heat exchanger is connected to the second end of the dry liquid storage tank through a first heat dissipation pipeline, the first end of the dry liquid 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 pipeline.

[0013] The cooling fan is connected to the power output shaft end of the engine, and the cooling fan is driven to rotate by the power output shaft of the engine; one end of the hydraulic electromagnetic reversing valve is connected to the tractor transmission lubrication system through a first oil circuit, and the other end is connected to the cooling fan through a second oil circuit. The hydraulic electromagnetic reversing valve is connected to the controller through a wiring harness.

[0014] The present invention provides the following beneficial effects: The radiators of each tractor subsystem are modularly and orderly arranged in front of a cooling fan. When the cooling fan rotates, air flows through each radiator in sequence, removing heat and achieving heat dissipation. Each radiator is modularly and orderly arranged, sharing a common cooling fan structure. Integrated thermal management is implemented through a control module, achieving heat dissipation and reverse airflow self-cleaning for each tractor radiator. The control module dynamically manages the cooling fan, adjusting its wind speed to reduce power and energy loss, facilitating the integrated layout of the thermal management system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Flowchart of the thermal management method of the present invention.

[0016] Figure 2 This is the overall layout diagram of the electro-hydraulic controlled heat dissipation system of the present invention.

[0017] Figure 3 This is a diagram of the architecture of the engine cooling module of the present invention.

[0018] Figure 4 This is a structural diagram of the transmission system heat dissipation module of the present invention.

[0019] Figure 5 This is a diagram of the structure of the transmission system heat dissipation module of the present invention.

[0020] Figure 6 This is a structural diagram of the transmission system heat dissipation module of the present invention.

[0021] Figure 7 This is a control principle diagram of the present invention.

[0022] Figure 2-7 In: 1. Engine radiator, 2. Cooling water pump, 3. Engine, 4. Engine overflow pot, 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 radiator, 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. Drying fluid storage tank, 27. Tractor air conditioning box, 28. First pressure sensor, 29. Second pressure sensor, 30. Fifth water temperature sensor, 31. Sixth water temperature sensor, 32. Cooling fan, 33. Hydraulic solenoid reversing valve, 34. Controller.

[0023] Figure 7 Middle: The dotted box pointed by letter A is the engine cooling module, the dotted box pointed by letter B is the transmission system cooling module, the dotted box pointed by letter C is the hydraulic system cooling module, the dotted box pointed by letter D is the air conditioning system cooling module, and the dotted box pointed by letter E is the cooling fan module. DETAILED DESCRIPTION

[0024] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments.

[0025] like Figure 1 As shown, the present invention first provides a modular integrated tractor thermal management method, comprising the following steps: Step 1: The engine radiator 1, condenser 24, oil radiator 14, and hydraulic radiator 19 are centrally arranged on the air outlet side of a cooling fan 32 with adjustable blade angles. The blade angle of the cooling fan 32 is controlled by a hydraulic electromagnetic reversing valve 33, which is controlled by a controller 34 of a control module. The controller 34 of the control module also controls the speed of the cooling fan 32. The engine radiator 1 is formed by integrating an air-cooled intercooler radiator and a water-cooled radiator. Step 2: When the tractor is operating in a working state, the temperature data acquisition unit respectively acquires actual temperature data of the engine cooling module, the transmission system cooling module, the hydraulic system cooling module, and the air conditioning system cooling module; Step 3: The controller 34 of the control module obtains the preset temperature difference data and preset fan speed data corresponding to the working state. 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 temperature and the air outlet temperature of the radiator, ΔT1F2 is the preset temperature difference between the water inlet temperature and the water outlet temperature of the water-cooled radiator of the engine radiator 1, ΔT1C is the preset temperature difference between the oil inlet temperature and the oil outlet temperature of the oil radiator 14, ΔT1Y is the preset temperature difference between the hydraulic oil inlet temperature and the hydraulic oil outlet temperature of the hydraulic radiator 19, and ΔT1K is the preset temperature difference between the water inlet temperature and the water inlet temperature of the tractor air conditioning box 27; Step 4: The controller 34 of the control module calculates an actual temperature difference corresponding to the preset temperature difference, where the actual temperature difference includes ΔT2F1 corresponding to ΔT1F1, ΔT2F2 corresponding to ΔT1F2, ΔT2C corresponding to ΔT1C, ΔT2Y corresponding to ΔT1Y, and ΔT2K corresponding to ΔT1K. ΔT2F1 is the actual temperature difference between the air inlet and air outlet temperatures of the air-cooled intercooler of the engine radiator 1, ΔT2F2 is the actual temperature difference between the water inlet and water outlet temperatures of the water-cooled radiator of the engine radiator 1, ΔT2C is the actual temperature difference between the oil inlet and oil outlet temperatures of the oil radiator 14, ΔT2Y is the actual temperature difference between the hydraulic oil inlet and hydraulic oil outlet temperatures of the hydraulic radiator 19, and ΔT2K is the actual temperature difference between the water temperature at the outlet and the water temperature at the inlet of the tractor air conditioning box 27. Step 5: The controller 34 of the control module determines the actual temperature difference value and the corresponding preset temperature difference value in real time, and controls the wind direction and speed of the cooling fan 32 in real time according to the determination result.

[0026] Step 5 is specifically as follows: the controller 34 of the control module determines in real time the difference between the actual temperature difference and the corresponding preset temperature difference. If only one of the actual temperature difference values ​​is greater than or equal to the corresponding preset temperature difference value, the controller 34 of the control module issues a response instruction to the cooling fan 32 to adjust the blade angle of the cooling fan 32 and simultaneously 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; If two or more actual temperature difference values ​​are greater than or equal to the corresponding preset temperature difference values, 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 issues a response instruction 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 values ​​are all smaller than the corresponding preset temperature difference values, the controller 34 of the control module sends a response instruction to the cooling fan 32, adjusts the blade angle of the cooling fan 32, and adjusts the speed of the cooling fan 32 to a 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.

[0027] The present invention also provides an electro-hydraulic controlled heat dissipation system using the above-mentioned thermal management method, 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 heat dissipation fan module (with reversible wind direction, for dissipating heat and removing dust from each radiator), and a control module; like Figure 2 As shown, the engine radiator 1 of the engine cooling module, the oil radiator 14 of the transmission cooling module, the hydraulic radiator 19 of the hydraulic cooling module, and the condenser 24 of the air conditioning cooling module are modularly 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 the cooling medium inlet and outlet. Each temperature sensor and cooling fan module is connected to a controller 34. Each radiator is modularly arranged and shares a set of cooling fans 32. Integrated thermal management is implemented by the controller 34 to dissipate heat from each tractor system. The engine radiator 1 is an integrated air-cooled intercooler radiator and a water-cooled radiator.

[0028] The beneficial effects of the above technical solution are as follows: various temperature sensors installed at the cooling medium inlet and outlet of each heat dissipation module are primarily used to determine the heat dissipation effect. All radiators are modularly and orderly arranged in front of the cooling fan 32. When the cooling fan 32 rotates, air blows through each radiator in sequence, removing heat and achieving the heat dissipation effect. Each radiator in the modular and orderly arrangement shares a set of cooling fans 32. Integrated thermal management is implemented through the controller 34, completing the heat dissipation and reverse blowing self-cleaning of each tractor radiator. The controller 34 dynamically manages the cooling fans 32, adjusting the fan 32 wind speed, reducing power loss and energy loss, and facilitating the integrated layout of the thermal management system.

[0029] like Figure 3As shown, the engine cooling module includes an engine radiator 1, a cooling water pump 2, an engine overflow pot 4, an electronic thermostat 5 and an electronic preheater 6. The air inlet of the air-cooled intercooler radiator of the engine radiator 1 is connected to the exhaust pipe outlet of the engine 3, and the air outlet of the air-cooled intercooler radiator is connected to the supercharger 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 cooling water pump 2, and the water outlet of the water-cooled radiator of the engine radiator 1 is connected to the cooling water return port of the engine 3. The engine overflow pot 4 is connected to the first end of the electronic thermostat 5 port, 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 through 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 through a wiring harness; the air inlet and the air outlet of the air-cooled intercooler radiator 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 the water 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.

[0030] The function of the above technical solution is 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 of the engine radiator 1 and various components that need to dissipate heat for heat exchange, thereby removing heat. The first water temperature sensor 7 and the second water temperature sensor 8 installed at the water inlet and outlet of the water-cooled radiator are used to determine the heat dissipation effect. The engine overflow pot 4 is used to store excess cooling water. When the water temperature threshold reaches the preset value and the electronic thermostat 4 is turned on, the 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 the engine start time.

[0031] like Figure 4 As shown, the transmission system heat dissipation module includes an oil radiator 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 radiator 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 radiator 14 are respectively connected to the first oil temperature sensor 15 and the second oil temperature sensor 16.

[0032] The above technical solution functions as follows: When the first gear pump 12 operates, it generates oil pressure, causing the hydraulic oil in the transmission system oil tank 11 to flow to the oil radiator 14, exchanging heat with the oil radiator 14 and removing the heat. First and second oil temperature sensors 15, 16, installed at the inlet and outlet of the oil radiator 14, determine the effectiveness of the heat dissipation; and the first electro-hydraulic proportional valve 13 primarily regulates the oil flow rate.

[0033] like Figure 5 As shown, the hydraulic system heat dissipation 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 a hydraulic oil pipeline to form a hydraulic oil circulation cooling pipeline, and 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, and 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.

[0034] The above technical solution functions as follows: When the second gear pump 17 is operating, it generates oil pressure, causing the hydraulic oil in the hydraulic oil tank 20 to flow to the hydraulic radiator 19, exchanging heat with the radiator and removing the heat. A third oil temperature sensor 21 and a fourth oil temperature sensor 22, installed at the hydraulic oil inlet and outlet of the hydraulic radiator 19, are used to determine the effectiveness of the heat dissipation. The second electro-hydraulic proportional valve 18 primarily regulates the hydraulic oil flow rate during heat dissipation in the hydraulic system. The hydraulic oil tank 20 is used to store the hydraulic oil.

[0035] like Figure 6 As shown, the air-conditioning system heat dissipation module includes a compressor 23, a condenser 24, a heat exchanger 25, a dry liquid 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 dry liquid storage tank 26 through a first heat dissipation pipeline. The first end of the dry liquid storage tank 26 is connected to the condenser 24 and the compressor 23 in sequence, and the compressor 23 is connected to the third end of the heat exchanger 25 through a second heat dissipation pipeline; 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 two ends of the compressor 23 are respectively connected to the first pressure sensor 28 and the second pressure sensor 29.

[0036] The above technical solution functions as follows: When engine 3 is operating, the engine fan pulley transmits power via a belt, driving compressor 23, generating circulating power. This causes the compressed refrigerant to flow to condenser 24 for heat exchange, then enter dry liquid storage 26 for drying. After drying, it continues to expand and cool within the tractor air conditioning box 27, exchanging heat with the hot air in the cab, removing heat. Fifth and sixth water temperature sensors 30 and 31, installed at the inlet and outlet of the tractor air conditioning box 27, are used to determine the effectiveness of heat dissipation. First and second pressure sensors 28 and 29, installed at the inlet and outlet of compressor 23, are primarily used to determine the effectiveness of compressor 23's power generation.

[0037] The cooling fan module includes a cooling fan 32 with adjustable blade angles and a hydraulic solenoid reversing valve 33. The hydraulic solenoid reversing valve 33 controls the blade angle of the cooling fan 32 and is connected to the control module. The cooling fan 32 is mounted on the engine power output shaft and connected to the power output shaft of the engine 3, and is driven by the power output shaft of the engine 3 to rotate. One end of the hydraulic solenoid reversing valve 33 is connected to the tractor 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 reversing valve 33 is connected to the controller 34 via a wiring harness. In this technical solution, the cooling fan 32 adopts a multi-blade variable-angle fan disclosed in patent CN107503983A. The hydraulic solenoid reversing valve 33 controls the blade angle of the cooling fan 32, allowing the airflow direction of the cooling fan 32 to switch between forward and reverse blowing. Accordingly, the structure of the cooling fan 32 and the hydraulic solenoid reversing valve 33 are already disclosed in the patent and will not be repeated here.

[0038] The function of the above technical solution is: when the engine 3 is working, the power output shaft of the engine 3 drives the cooling fan 32 to rotate, and the tractor transmission lubrication system, the hydraulic electromagnetic reversing valve 33 and the cooling fan 32 form a hydraulic closed system. The hydraulic electromagnetic reversing valve 33 is controlled by the controller 34, thereby controlling the change in the blade angle of the cooling fan 32.

[0039] 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, while 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 via 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 reversing valve 33 serve as actuators, executing commands issued by the controller 34.

[0040] The principle of the technical solution of the present invention is as follows: various temperature sensors installed at the entrance and exit of each radiator are mainly used to determine the heat dissipation effect. All radiators are modularly and orderly arranged in front of the cooling fan 32. When the cooling fan 32 rotates, wind blows through each radiator in turn, removing heat and achieving the heat dissipation effect. Each radiator is modularly and orderly arranged and shares a set of cooling fans 32. Integrated thermal management is performed through the controller 34 of the control module to complete the heat dissipation of each tractor radiator and reverse blowing to clean the self-cleaning radiator. Through the dynamic management of the cooling fan 32 by the controller 34 of the control module, the wind speed of the cooling fan 32 is adjusted to reduce power loss and energy loss, facilitating the integrated layout of the thermal management system. The corresponding fan speeds required for each radiator under different working conditions are pre-set. 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 determines and compares the actual temperature difference between the inlet and outlet temperature sensors of each radiator and the corresponding preset temperature difference. If any actual temperature difference reaches the corresponding preset temperature difference, the cooling fan 32 is controlled to start accelerating until the cooling fan 32 reaches the preset speed required by the radiator.

[0041] Specifically, with reference to the thermal management method and electro-hydraulic control cooling system provided by the present invention, different input parameters can be set according to different working conditions of the tractor to achieve more refined management of the tractor cooling system.

[0042] The parts not described in detail in this invention are prior art.

Claims

1. A modular integrated tractor thermal management method, characterized by: The following steps are involved: Step 1: The engine radiator (1), the condenser (24), the oil radiator (14) and the hydraulic radiator (19) are centrally arranged on the air outlet side of a cooling fan (32) with adjustable blade angles. The blade angle of the cooling fan (32) is controlled by a hydraulic electromagnetic reversing valve (33). The hydraulic electromagnetic reversing valve (33) is controlled by a controller (34) of a control module. The controller (34) of the control module also controls the speed of the cooling fan (32). The engine radiator (1) is formed by integrating an air-cooled intercooler radiator and a water-cooled radiator. Step 2: When the tractor is operating in a working state, the temperature data acquisition unit respectively acquires actual temperature data of the engine cooling module, the transmission system cooling module, the hydraulic system cooling module, and the air conditioning system cooling module; Step 3: The controller (34) of the control module obtains preset temperature difference data and preset fan speed data corresponding to the working state, wherein the preset temperature difference data includes △T1F1, △T1F2, △T1C, △T1Y and △T1K, and 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 heat dissipation of the engine radiator (1). △T1F2 is a preset temperature difference between the water inlet temperature and the water outlet temperature of the water-cooled radiator of the engine radiator (1), △T1C is a preset temperature difference between the oil inlet temperature and the oil outlet temperature of the oil radiator (14), △T1Y is a preset temperature difference between the hydraulic oil inlet temperature and the hydraulic oil outlet temperature of the hydraulic radiator (19), and △T1K is a preset temperature difference between the water outlet temperature and the water inlet 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 value between the air inlet temperature and the air outlet temperature of the air-cooled intercooler radiator of the engine radiator (1), △T2F2 is the actual temperature difference value between the water inlet temperature and the water outlet temperature of the water-cooled radiator of the engine radiator (1), △T2C is the actual temperature difference value between the oil inlet temperature and the oil outlet temperature of the oil radiator (14), △T2Y is the actual temperature difference value between the hydraulic oil inlet temperature and the hydraulic oil outlet temperature of the hydraulic radiator (19), and △T2K is the actual temperature difference value between the outlet end water temperature and the inlet end water temperature of the tractor air conditioning box (27); Step 5: The controller (34) of the control module determines in real time the magnitude of each actual temperature difference value and the corresponding preset temperature difference value, and controls the wind direction and speed of the cooling fan (32) in real time according to the determination result.

2. The modular integrated tractor thermal management method according to claim 1, characterized in that: The step 5 is specifically as follows: the controller (34) of the control module determines in real time the size of each actual temperature difference value and the corresponding preset temperature difference value. 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 instruction 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 corresponding to the preset temperature difference value, so that the cooling fan (32) blows air in the forward direction to dissipate heat; If two or more actual temperature difference values ​​are greater than or equal to the corresponding preset temperature difference values, 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 issues a response instruction 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 values ​​are all less than the corresponding preset temperature difference values, the controller (34) of the control module sends a response instruction to the cooling fan (32), adjusts the blade angle of the cooling fan (32), and simultaneously adjusts the speed of the cooling fan (32) to a first preset speed, so that the cooling fan (32) blows air in the reverse direction to remove dust; the first preset speed is the maximum value among SF1, SF2, SC, SY and SK.

3. An electro-hydraulic controlled heat dissipation system using the thermal management method according to any one of claims 1-2, characterized in that: The invention comprises 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, wherein the engine cooling module comprises an engine radiator (1), the transmission system cooling module comprises an oil radiator (14), the hydraulic system cooling module comprises a hydraulic radiator (19), and the air conditioning system cooling module comprises a condenser (24); the cooling fan module comprises a cooling fan (32) with adjustable blade angle and a hydraulic electromagnetic reversing valve (33), the hydraulic electromagnetic reversing valve (33) controls the blade angle of the cooling fan (32), and the hydraulic electromagnetic reversing valve (33) is connected to the control module; The engine radiator (1) and the condenser (24) are arranged in sequence from front to back on the air outlet side of the cooling fan (32), and the oil radiator (14) and the hydraulic radiator (19) are arranged in parallel between the engine radiator (1) and the condenser (24); the engine radiator (1) is formed by integrating an air-cooled intercooler radiator 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 wind direction of the cooling fan (32) according to the collected temperature data. The cooling fan (32) simultaneously blows air to dissipate heat or sucks air to remove impurities to the engine radiator (1), the oil radiator (14), the hydraulic radiator (19), and the condenser (24).

4. The electro-hydraulic controlled heat dissipation system according to claim 3, characterized in that: The air inlet and the air 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); the water inlet and the water 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 radiator (14) is connected to the transmission system oil tank (11) via an oil pipeline, and the oil inlet and oil outlet of the oil radiator (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) via a hydraulic oil pipeline, and the hydraulic oil inlet and the 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 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); 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 a temperature data acquisition unit of the control module, and the first pressure sensor (28) and the second pressure sensor (29) constitute a pressure data acquisition unit of the control module.

5. The electro-hydraulic controlled heat dissipation system according to claim 3, characterized in that: The engine heat dissipation module comprises a cooling water pump (2), an engine overflow pot (4), an electronic thermostat (5) and an electronic preheater (6); the air inlet of the air-cooled intercooler radiator of the engine radiator (1) is connected to the exhaust pipe outlet of the engine (3); the air outlet of the air-cooled intercooler radiator is connected to the supercharger 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 cooling water pump (2); the water-cooled radiator of the engine radiator (1) is connected to the cooling water outlet of the engine (3); The water outlet of the preheater is connected to the cooling water return port of the engine (3), the engine overflow pot (4) is connected to the first port of the electronic thermostat (5), and 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) through 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) through a wiring harness.

6. The electro-hydraulic controlled heat dissipation system according to claim 3, characterized in that: The transmission system heat dissipation module comprises 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 radiator (14) are sequentially connected through an oil pipeline to form an oil circulation cooling pipeline; both ends of the oil circulation cooling pipeline are respectively connected to the transmission system oil tank (11); and the first electro-hydraulic proportional valve (13) is connected to a controller (34).

7. The electro-hydraulic controlled heat dissipation system according to claim 3, characterized in that: The hydraulic system heat dissipation module comprises 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 sequentially connected through a hydraulic oil pipeline to form a hydraulic oil circulation cooling pipeline; both ends of the hydraulic oil circulation cooling pipeline are respectively connected to a hydraulic oil tank (20); and the second electro-hydraulic proportional valve (18) is connected to a controller (34).

8. The electro-hydraulic controlled heat dissipation system according to claim 3, characterized in that: The air conditioning system heat dissipation module comprises a heat exchanger (25) and a dry liquid storage tank (26); a first end of the heat exchanger (25) is connected to a tractor air conditioning box (27); a second end of the heat exchanger (25) is connected to a second end of the dry liquid storage tank (26) via a first heat dissipation pipeline; a first end of the dry liquid storage tank (26) is connected to a condenser (24) and a compressor (23) in sequence; and a second heat dissipation pipeline is connected between the compressor (23) and the third end of the heat exchanger (25).

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

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