Hybrid thermal management system and hybrid tractor

Abstract

The invention discloses a hybrid thermal management system and a hybrid tractor, and the hybrid thermal management system comprises a cabin air conditioner thermal management loop, an electric drive thermal management loop and an engine thermal management loop, an air conditioner condenser of the air conditioner heat management loop, an electric drive radiator of the electric drive heat management loop and an engine radiator assembly of the engine heat management loop are sequentially arranged side by side on the chassis in the horizontal direction, and the engine radiator assembly is provided with a shared first cooling fan deviating from the electric drive radiator. According to the hybrid power thermal management system, the radiators are arranged in a centralized mode, the structure is more compact, the utilization rate of the space in a vehicle can be increased, the number of cooling fans is reduced, and the material cost of the system is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of hybrid vehicles, and in particular relates to a hybrid thermal management system and a hybrid tractor. Background Art

[0002] With the development of hybrid technology, tractors have also begun to apply this technology to ensure that the engine works in the best economic zone as much as possible. Unlike general passenger vehicles, tractors are equipped with electric drive devices such as working motors, PTO motors, and oil pump motors in addition to drive motors, and each electric drive device needs to be cooled. The various heat dissipation mechanisms of existing hybrid tractors mostly adopt independent heat dissipation forms, and the heat dissipation mechanisms are arranged in a scattered manner. At least one fan is set for each heat dissipation mechanism. There are many fans, the arrangement is cumbersome, and they take up space, which is not conducive to the compactness of the whole machine. Summary of the invention

[0003] In view of the above-mentioned defects or shortcomings, the present invention provides a hybrid thermal management system and a hybrid tractor, aiming to solve the technical problems in existing hybrid tractors that each heat dissipation mechanism is independently arranged, occupies a large space and has a high cost.

[0004] To achieve the above object, the present invention provides a hybrid thermal management system, wherein the hybrid thermal management system comprises:

[0005] The cabin air conditioning thermal management circuit has an air conditioning condenser;

[0006] Electric drive thermal management circuit with electric drive radiator;

[0007] an engine thermal management circuit having an engine radiator assembly;

[0008] Among them, the air-conditioning condenser, electric drive radiator and engine radiator assembly are arranged side by side in the horizontal direction on the chassis, and share a first cooling fan, and the first cooling fan is arranged on the side of the engine radiator assembly away from the electric drive radiator.

[0009] In an embodiment of the present invention, the hybrid thermal management system further includes a clutch device, wherein an active end of the clutch device is connected to an output shaft of the engine, and a driven end of the clutch device is connected to a first cooling fan.

[0010] In an embodiment of the present invention, the hybrid thermal management system further includes a transmission thermal management circuit, the transmission thermal management circuit has a transmission radiator, and the transmission radiator and the electric drive radiator are arranged in the same row.

[0011] In an embodiment of the present invention, the hybrid thermal management system further includes a hydraulic oil thermal management circuit, the hydraulic oil thermal management circuit has a hydraulic oil radiator, and the hydraulic oil radiator and the engine radiator assembly are arranged in sequence and spaced apart in the height direction.

[0012] In an embodiment of the present invention, the hybrid thermal management system further includes a vehicle controller and a temperature detection component, the temperature detection component is used to detect the circuit temperatures of the electric drive thermal management circuit, the engine thermal management circuit, the transmission thermal management circuit and the hydraulic oil thermal management circuit respectively, the vehicle controller is respectively connected to the temperature detection component and the controller of the clutch device, and is configured as follows:

[0013] Obtaining the loop temperature of each thermal management loop detected by the temperature detection component;

[0014] Determining corresponding clutch opening values ​​according to the circuit temperature of each thermal management circuit;

[0015] The clutch opening value with the largest value is selected as the output opening value, and the current opening of the clutch device is adjusted to the output opening value.

[0016] In an embodiment of the present invention, a flow controller connected to the vehicle controller is provided in each of the electric drive thermal management circuit, the engine thermal management circuit, the transmission thermal management circuit and the hydraulic oil thermal management circuit. After obtaining the circuit temperature of each thermal management circuit detected by the temperature detection component, the following steps are further included:

[0017] Determine the corresponding output flow value according to the loop temperature of each thermal management loop;

[0018] The flow controller in the corresponding thermal management loop is controlled according to the output flow value to adjust the flow of the heat dissipation medium in the radiator.

[0019] In an embodiment of the present invention, the electric drive thermal management circuit has multiple electric drive heat dissipation circuits, the water inlet of each electric drive heat dissipation circuit is connected to the water outlet of the electric drive radiator, and the water outlet of each electric drive heat dissipation circuit is connected to the water inlet of the electric drive radiator, each electric drive heat dissipation circuit flows through at least two electric drive devices, and the at least two electric drive devices are arranged in sequence along the circuit flow direction from low to high according to the heat dissipation temperature, and the flow rate required for heat dissipation of any electric drive device flowing through each electric drive heat dissipation circuit is within the same flow rate range, and the total resistance of all electric drive devices flowing through the multiple electric drive heat dissipation circuits is within the same resistance range.

[0020] In an embodiment of the present invention, the engine radiator assembly includes an engine intercooler radiator and an engine water-cooler radiator, the engine intercooler radiator and the engine water-cooler radiator are spaced apart in the height direction, and the engine intercooler radiator is respectively connected to the air outlet and air inlet of the engine compressor, the engine water-cooler radiator is respectively connected to the water inlet and water outlet of the engine, temperature sensors are provided on the air inlet and the water outlet, a thermostat configured as a flow controller is integrated in the engine, and the thermostat is connected to the circuit between the water inlet and the water outlet.

[0021] In an embodiment of the present invention, the transmission thermal management circuit is also provided with a transmission axle, a first hydraulic pump and a first proportional valve serving as a flow controller. The input shaft of the first hydraulic pump is connected to the output shaft of the engine. The first proportional valve is provided with two oil outlets, one of which is connected to the transmission, and the other is connected to the transmission radiator.

[0022] In an embodiment of the present invention, the hydraulic oil thermal management circuit is also provided with a hydraulic oil tank, a second hydraulic pump and a second proportional valve serving as a flow controller, the input shaft of the second hydraulic pump is connected to the output shaft of the engine, and the second proportional valve is provided with two oil outlets, one of which is connected to the hydraulic oil tank, and the other is connected to the hydraulic oil radiator.

[0023] In an embodiment of the present invention, the hybrid thermal management system also includes a battery thermal management circuit, which includes a battery heating circuit and a battery heat dissipation circuit. The battery heating circuit is provided with an electric heating device capable of heating the coolant, and the battery heat dissipation circuit is provided with a cold pump device capable of forcibly cooling the coolant. A second cooling fan is provided on one side of the condenser in the cold pump device.

[0024] In order to achieve the above object, the present invention also provides a hybrid tractor, wherein the hybrid tractor includes the above hybrid thermal management system.

[0025] Through the above technical solution, the hybrid thermal management system and hybrid tractor provided by the embodiment of the present invention have the following beneficial effects:

[0026] When the above-mentioned hybrid thermal management system is used, the cabin air-conditioning thermal management circuit, the electric drive thermal management circuit and the engine thermal management circuit are used to dissipate heat for the cabin, the electric drive device and the engine respectively. The air-conditioning condenser, the electric drive radiator and the engine radiator components are centrally arranged and share a first cooling fan. Compared with the solution in which each thermal management circuit is independently arranged, the hybrid thermal management system centrally arranges each radiator, and the structure is more compact, which can improve the utilization rate of the space in the vehicle, and reduces the number of cooling fans, thereby reducing the material cost of the system. At the same time, the air-conditioning condenser, the electric drive radiator and the engine radiator components are arranged side by side in sequence according to the cooling needs, which can also improve the heat dissipation efficiency of each thermal management circuit.

[0027] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are used to provide an understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation of the present invention. In the accompanying drawings:

[0029] Figure 1is a schematic diagram of the arrangement of a radiator according to an embodiment of the present invention;

[0030] Figure 2 is a schematic diagram of the arrangement of an engine radiator assembly and a first cooling fan according to an embodiment of the present invention;

[0031] Figure 3 is a schematic diagram of the arrangement of a heat sink at another viewing angle according to an embodiment of the present invention;

[0032] Figure 4 is a schematic diagram of an electric drive thermal management circuit according to an embodiment of the present invention;

[0033] Figure 5 is a schematic diagram of an engine thermal management circuit according to an embodiment of the present invention;

[0034] Figure 6 is a schematic diagram of a transmission thermal management circuit according to an embodiment of the present invention;

[0035] Figure 7 is a schematic diagram of a hydraulic oil thermal management circuit according to an embodiment of the present invention;

[0036] Figure 8 is a schematic diagram of a battery thermal management circuit according to an embodiment of the present invention;

[0037] Fig. 9 is a control flow chart of a vehicle controller according to an embodiment of the present invention.

[0038] Description of Reference Numerals

[0039] 10 Air conditioning condenser 2 Electric drive thermal management circuit

[0040] 20 Electric drive radiator 21 First water pump

[0041] 22 Motor controller 23 Working motor

[0042] 24 First expansion tank 3 Engine thermal management circuit

[0043] 30 Engine radiator assembly 31 Engine intercooler radiator

[0044] 32 Engine water cooling radiator 33 Engine

[0045] 34 Thermostat 35 Second expansion tank

[0046] 4 Transmission thermal management circuit 40 Transmission radiator

[0047] 41 First proportional valve 42 First hydraulic pump

[0048] 43 Transmission Axle 5 Hydraulic Oil Thermal Management Circuit

[0049] 50 Hydraulic oil radiator 51 Second proportional valve

[0050] 52 Second hydraulic pump 53 Hydraulic oil tank

[0051] 6 Battery Thermal Management Circuit 60 Battery Pack

[0052] 61 Electric heating device 62 Cooling pump device

[0053] 621 Battery Condenser 622 Compressor

[0054] 63 Third expansion water tank 64 Second water pump

[0055] 65 Second cooling fan 66 Pressure sensor

[0056] 70 Temperature sensor 81 Clutch device

[0057] 82 First cooling fan DETAILED DESCRIPTION

[0058] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0059] The hybrid thermal management system and hybrid tractor of the present invention will be described below with reference to the accompanying drawings.

[0060] The present invention provides a hybrid thermal management system, wherein the hybrid thermal management system comprises:

[0061] A cabin air conditioning thermal management circuit, comprising an air conditioning condenser 10;

[0062] The electric drive thermal management circuit 2 has an electric drive radiator 20;

[0063] An engine thermal management circuit 3 having an engine radiator assembly 30;

[0064] like Figure 1 and Figure 2 As shown, the air-conditioning condenser 10, the electric drive radiator 20 and the engine radiator assembly 30 are arranged side by side in sequence in a horizontal direction on the chassis, and share a first cooling fan 82, and the first cooling fan 82 is arranged on the side of the engine radiator assembly 30 away from the electric drive radiator 20.

[0065] When the above-mentioned hybrid thermal management system is used, the cabin air-conditioning thermal management circuit, the electric drive thermal management circuit 2 and the engine thermal management circuit 3 are used to dissipate heat for the cabin, the electric drive device and the engine 33 respectively. The air-conditioning condenser 10, the electric drive radiator 20 and the engine radiator assembly 30 are centrally arranged and share a first cooling fan 82. Compared with the solution in which each thermal management circuit is independently arranged, the hybrid thermal management system centrally arranges each radiator, and the structure is more compact, which can improve the utilization rate of the space in the vehicle, and reduces the number of cooling fans, thereby reducing the material cost of the system. At the same time, the air-conditioning condenser 10, the electric drive radiator 20 and the engine radiator assembly 30 are arranged side by side in sequence according to the cooling needs, which can also improve the heat dissipation efficiency of each thermal management circuit.

[0066] Specifically, the engine 33 is generally arranged at the front of the tractor, and the engine radiator assembly 30 is located at the air inlet side of the first cooling fan 82. The air enters from the air intake grille at the front of the tractor, and passes through the air conditioning condenser 10, the electric drive radiator 20 and the engine radiator assembly 30 from the outside to the inside. Since the heat dissipation temperature of the front radiator is lower than the heat dissipation temperature of the rear radiator, the air can still maintain a certain temperature difference between the radiators after being heated, ensuring the heat transfer efficiency and avoiding mutual interference between the thermal management circuits. In addition, a certain gap is reserved between the air conditioning condenser 10, the electric drive radiator 20 and the engine radiator assembly 30 to facilitate air intake and cleaning of dust layers.

[0067] like Figure 1 As shown, in the embodiment of the present invention, the hybrid thermal management system further includes a transmission thermal management loop 4, the transmission thermal management loop 4 has a transmission radiator 40, and the transmission radiator 40 and the electric drive radiator 20 are arranged in the same row; the transmission thermal management loop 4 is used to dissipate heat from the gearbox oil in the gearbox to maintain the temperature of the gearbox oil, see Table 1, preferably, the temperature requirement of the gearbox oil is basically consistent with the heat dissipation requirement of the electric drive device, then the transmission radiator 40 and the electric drive radiator 20 are arranged in the same row, so as to improve the utilization rate of the space inside the vehicle while ensuring the heat dissipation effect.

[0068] like Figure 3 As shown, in the embodiment of the present invention, the hybrid thermal management system further includes a hydraulic oil thermal management circuit 5, which includes a hydraulic oil radiator 50, and the hydraulic oil radiator 50 and the engine radiator assembly 30 are sequentially arranged in a spaced relationship along the height direction. The hydraulic oil thermal management circuit 5 is used to dissipate the heat of the hydraulic oil in the hydraulic system to maintain the temperature of the hydraulic oil, and the hydraulic oil radiator 50 and the engine radiator 33 are spaced in a height direction, forming a mutually perpendicular layout with the transmission radiator 40 and the electric drive radiator 20 on the front side, which is conducive to the heat dissipation fins on each radiator contacting with the air and dissipating heat.

[0069] In the embodiment of the present invention, the hybrid thermal management system further includes a clutch device 81, the active end of the clutch device 81 is connected to the output shaft of the engine 33, and the driven end of the clutch device 81 is connected to the first cooling fan 82. The present invention directly drives the first cooling fan 82 through the engine 33 in cooperation with the clutch device 81, further simplifying the structure of the hybrid thermal management system and reducing its material cost.

[0070] In the prior art, the fan generally needs to be equipped with a hydraulic pump, a hydraulic motor, a proportional valve, etc. to drive and control the fan or an electronic fan, which is costly. The solution of driving and controlling the fan with a hydraulic pump, a hydraulic motor, and a proportional valve is difficult to achieve stepless speed regulation, and the electronic fan faces severe durability and reliability tests in the use environment of the hybrid tractor, which increases the failure rate of the system. The first cooling fan 82 of the present invention is directly driven by the engine 33 through the clutch device 81, and the speed of the first cooling fan 82 can be achieved by the opening of the clutch in the clutch device 81. When the clutch opening is 0%, the first cooling fan 82 is completely disconnected from the clutch, and when the clutch opening is 100%, the first cooling fan 82 rotates synchronously with the clutch.

[0071] Specifically, the active end of the clutch device 81 includes a transmission shaft and a belt, the belt is wound around the output shaft of the engine 33 and drives the transmission shaft to rotate, and the driven end of the clutch device 81 includes a driven plate and a driven shaft, the driven plate is mounted on one end of the driven shaft through a spline hub, and the other end of the driven shaft is driven and connected to the first cooling fan 82, and the first cooling fan 82 and the engine 33 can be arranged at intervals through the belt drive to avoid interference. It should be noted that the clutch is a prior art, so the specific structure of the clutch will not be described in detail here.

[0072] In the embodiment of the present invention, the hybrid thermal management system further includes a vehicle controller and a temperature detection component, the temperature detection component is used to detect the circuit temperatures of the electric drive thermal management circuit 2, the engine thermal management circuit 3, the transmission thermal management circuit 4 and the hydraulic oil thermal management circuit 5 respectively, and the vehicle controller is respectively connected to the temperature detection component and the clutch device 81 for communication. Fig. 9 As shown, the vehicle controller is configured as:

[0073] Step S100, obtaining the loop temperature of each thermal management loop detected by the temperature detection component;

[0074] Specifically, the temperature detection component includes a plurality of temperature sensors 70. The electric drive thermal management circuit 2, the intercooler heat dissipation circuit in the engine thermal management circuit 3 and the water cooling heat dissipation circuit are all provided with temperature sensors 70. Each temperature sensor 70 is communicatively connected to the vehicle controller.

[0075] Step S200, determining the corresponding clutch opening value according to the circuit temperature of each thermal management circuit;

[0076] Specifically, referring to Table 1, according to the heat dissipation temperature ranges of the electric drive thermal management circuit 2, the engine thermal management circuit 3, the transmission thermal management circuit 4 and the hydraulic oil thermal management circuit 5, the heat dissipation temperature range of each circuit is divided into five temperature points, each temperature point corresponds to a clutch opening, and the corresponding table data is input into the storage unit of the vehicle controller. When the temperature sensor 70 measures a temperature value, the vehicle controller selects the clutch opening corresponding to the temperature point closest to the temperature value as the clutch opening value by looking up the table. Of course, the present invention is not limited to this, and a functional relationship can also be constructed for the clutch opening and temperature. After receiving the temperature value fed back by the temperature sensor 70, the vehicle controller can calculate the corresponding clutch opening value by the functional relationship.

[0077] Step S300, selecting the clutch opening value with the largest value as the output opening value, and adjusting the current opening of the clutch device 81 to the output opening value.

[0078] During the operation of the hybrid tractor, the heat generated by the engine 33 and the electric drive device is different under different working conditions. The above steps can ensure that the electric drive thermal management circuit 2 and the engine thermal management circuit 3 are always maintained within a safe temperature.

[0079] In the embodiment of the present invention, the clutch device 81 is also equipped with a clutch controller. A speed sensor is also provided on the driven end of the clutch device 81. The detection structure of the speed sensor is the speed of the first cooling fan 82. The speed sensor, the clutch controller and the vehicle controller are connected in communication. The speed sensor transmits the fan speed signal to the vehicle controller. The vehicle controller then transmits the fan speed signal and the temperature signal collected by the temperature detection component to the clutch controller. The clutch controller compares the received temperature signal with the preset speed and each temperature point shown in Table 1 to adjust the clutch opening and adjust the speed of the first cooling fan 82. The clutch opening shown in Table 1 is the factory parameter of the hybrid tractor. As the hybrid tractor is used for a longer time, the clutch will inevitably wear out to a certain extent. The input clutch opening value and the actual clutch opening value may have a certain deviation. By providing a speed sensor, the actual clutch opening value can be judged. According to the difference between the input opening value and the actual opening value, the feedback adjustment of the clutch opening can be realized to ensure that the clutch device 81 can accurately and quickly respond to the input opening value.

[0080] In the embodiment of the present invention, the electric drive thermal management circuit 2, the engine thermal management circuit 3, the transmission thermal management circuit 4 and the hydraulic oil thermal management circuit 5 are all provided with a flow controller that is communicatively connected to the vehicle controller. Step S100, after obtaining the circuit temperature of each thermal management circuit detected by the temperature detection component, further includes:

[0081] Determine the corresponding output flow value according to the loop temperature of each thermal management loop;

[0082] The flow controller in the corresponding thermal management loop is controlled according to the output flow value to adjust the flow of the heat dissipation medium in the radiator.

[0083] It is understandable that if there is a difference in the heat dissipation temperature range of the electric drive thermal management loop 2 and the engine thermal management loop 3, then one of them needs heat dissipation while the other does not or has a lower heat dissipation demand. In this case, the heat dissipation medium entering the radiator can be controlled through the flow controller and the above steps. For example, the engine thermal management loop 3 needs heat dissipation, but the electric drive thermal management loop 2 does not need heat dissipation. In this case, the heat dissipation medium can be controlled not to enter the electric drive radiator 20 through the flow controller, and the first cooling fan 82 only needs to dissipate heat for the engine 33 radiator. Under the premise of ensuring the normal operation of the system, the interference of the electric drive thermal management loop 2 is eliminated, and the heat dissipation efficiency of the engine 33 radiator is improved.

[0084] like Figure 4 As shown, in an embodiment of the present invention, the electric drive thermal management circuit 2 has multiple electric drive heat dissipation circuits, the water inlet of each electric drive heat dissipation circuit is connected to the water outlet of the electric drive radiator 20, and the water outlet of each electric drive heat dissipation circuit is connected to the water inlet of the electric drive radiator 20, each electric drive heat dissipation circuit flows through at least two electric drive devices, and at least two electric drive devices are arranged in sequence along the circuit flow direction from low to high according to the heat dissipation temperature, and the flow rate required for heat dissipation of any electric drive device flowing through each electric drive heat dissipation circuit is within the same flow rate range, and the total resistance of all electric drive devices flowing through multiple electric drive heat dissipation circuits is within the same resistance range.

[0085] The electric drive device of a hybrid tractor generally includes a generator, a drive motor, an operating motor, a PTO motor, an oil pump motor and corresponding controllers, a DCDC converter, etc. Each electric drive heat dissipation circuit needs to be equipped with a first water pump 21. Considering the flow rate of the first water pump 21, at least two electric drive devices with the same or similar flow rates are arranged on the same electric drive heat dissipation circuit so that the flow rate required for heat dissipation of the electric drive heat dissipation device is adapted to the flow rate of the first water pump 21. It can be understood that if the flow rates required for heat dissipation of the two electric drive heat dissipation devices are quite different, in order to meet the heat dissipation requirements, the first water pump 21 must be selected based on the electric drive device with a large flow rate, then the actual flow rate passing through the remaining electric drive devices is much greater than the flow rate required for heat dissipation. The flow rate causes energy waste. Therefore, when designing the electric drive thermal management loop 2, the electric drive devices with flow rates in the same range are arranged in the same electric drive heat dissipation loop, thereby reducing energy waste. Taking into account the head of the first water pump 21, when designing the electric drive thermal management loop 2, the electric drive devices through which each electric drive heat dissipation loop flows are configured so that the resistance in the electric drive heat dissipation loop does not exceed the head of the first water pump 21, thereby ensuring the normal operation of the first water pump 21, and the resistances of each electric drive heat dissipation loop are the same or similar, and the optimal number of first water pumps 21 is configured while taking into account performance, thereby saving costs, and each electric drive heat dissipation loop is connected in parallel with the electric drive radiator 20, and each electric drive heat dissipation loop does not affect each other.

[0086] It should be noted that, in each electric drive heat dissipation circuit, the above-mentioned working motor 23, motor controller 22, and DCDC converter are grouped according to their flow rate and resistance. An electric drive heat dissipation circuit may include two or more working motors 23 or motor controllers 22, and the working motors 23 and the motor controllers 22 do not need to correspond one to one. For example, the working motor and the controller of the working motor can be arranged in the same electric drive heat dissipation circuit, or the controller of the working motor and the drive motor can be arranged in the same electric drive heat dissipation circuit. The specific grouping scheme is designed according to the actual flow rate and resistance of each electric drive device.

[0087] Specifically, the heat dissipation temperature of the motor controller 22 is generally lower than the heat dissipation temperature of the working motor 23 . Therefore, the electric drive heat dissipation loop first flows through the motor controller 22 and then flows through the working motor 23 .

[0088] Specifically, the electric drive radiator 20 is connected to a first expansion water tank 24, which is used to replenish the heat dissipation medium and exhaust gas. A first water pump 21 and a temperature sensor 70 are provided on the electric drive heat dissipation circuit. The first water pump 21 is provided on the water inlet side of the motor controller 22, and the temperature sensor 70 is provided at the water outlet of the working motor 23.

[0089] Furthermore, the first water pump 21 is preferably an electronic water pump, which is communicatively connected to the vehicle controller as a flow controller on the electric drive heat dissipation circuit. The vehicle controller converts the received temperature signal into a PWM duty cycle signal and transmits it to the electronic water pump. The electronic water pump adjusts the speed of the electronic water pump according to the PWM duty cycle signal. Within the working range of the electronic water pump, the higher the speed, the greater the flow rate, thereby adjusting the temperature of the electric drive device.

[0090] Specifically, the electric drive thermal management circuit 2 has four electric drive heat dissipation circuits. The first electric drive heat dissipation circuit passes through the travel motor controller, the travel motor and the working motor in sequence; the second electric drive heat dissipation circuit passes through the travel motor controller, the generator controller and the generator in sequence; the third electric drive heat dissipation circuit passes through the oil pump motor controller, the DCDC converter and the oil pump motor in sequence; the fourth electric drive heat dissipation circuit passes through the PTO motor; among which, the total resistance of each electric drive device in the first electric drive heat dissipation circuit, the second electric drive heat dissipation circuit and the third electric drive heat dissipation circuit is in the same resistance range, and the flow rates of each electric drive device are close, then the three electric drive heat dissipation circuits use the same model of electronic water pump, and the electronic water pump of the fourth electric drive heat dissipation circuit is selected separately according to the parameters of the PTO motor.

[0091] like Figure 3 and Figure 5 As shown, in the embodiment of the present invention, the engine radiator assembly 30 includes an engine intercooler radiator 31 and an engine water-cooler radiator 32, and the engine intercooler radiator 31 and the engine water-cooler radiator 32 are arranged at intervals in the height direction, and form a mutually perpendicular layout with the transmission radiator 40 and the electric drive radiator 20 on the front side, which is conducive to the heat dissipation fins on each radiator contacting with the air and dissipating heat. In addition, the engine intercooler radiator 31 is respectively connected to the air outlet and air inlet of the compressor of the engine 33, and the engine water-cooler radiator 32 is respectively connected to the water inlet and water outlet of the engine 33, and the air inlet and water outlet are both provided with temperature sensors 70, and the engine 33 is integrated with a thermostat 34 set as a flow controller, and the thermostat 34 is connected to the circuit between the water inlet and the water outlet. The engine intercooler radiator 31 is connected to a second expansion water tank 35, and the thermostat 34 is used to adjust the water flow at the water outlet. When the temperature is lower than 80°C, the thermostat 34 is closed and the flow is 0. When the water temperature reaches 90°C, the thermostat 34 is fully opened and the water outlet flow is 100%.

[0092] like Figure 6As shown, in the embodiment of the present invention, the transmission thermal management circuit 4 is provided with a transmission radiator 40, a gearbox axle 43, a first hydraulic pump 42 and a first proportional valve 41 as a flow controller. The input shaft of the first hydraulic pump 42 is connected to the output shaft of the engine 33. The first proportional valve 41 is provided with two oil outlets, one of which is connected to the gearbox and the other is connected to the transmission radiator 40. The first hydraulic pump 42 is directly driven by the engine 33. By adjusting the first proportional valve 41, the amount of hydraulic oil entering the transmission radiator 40 can be controlled, so that the hydraulic oil is maintained at a more suitable temperature to reduce the working energy consumption of each hydraulic system component. For example, when the hydraulic oil is lower than 60°C, there is no need to cool the gearbox oil. The oil outlet of the first proportional valve 41 connected to the gearbox axle 43 is fully opened, and the oil outlet connected to the transmission radiator 40 is fully closed.

[0093] Specifically, a temperature sensor 70 is also provided on the transmission thermal management circuit 4. The temperature sensor 70 is arranged at the oil outlet of the transmission axle 43. The first proportional valve 41 is communicatively connected with the vehicle controller. The vehicle controller controls the oil outlet ratio of the two oil outlets in the first proportional valve 41 according to the feedback data of the temperature sensor 70.

[0094] like Figure 7 As shown, in the embodiment of the present invention, the hydraulic oil thermal management circuit 5 is provided with a hydraulic oil radiator 50, a hydraulic oil tank 53, a second hydraulic pump 52 and a second proportional valve 51 as a flow controller. The input shaft of the second hydraulic pump 52 is connected to the output shaft of the engine 33. The second proportional valve 51 is provided with two oil outlets, one of which is connected to the oil tank and the other is connected to the hydraulic oil radiator 50. The second hydraulic pump 52 is directly driven by the engine 33. By adjusting the second proportional valve 51, the amount of transmission oil entering the transmission radiator 40 can be controlled, so that the transmission oil is maintained at a more suitable temperature to ensure the transmission efficiency of the transmission axle 43. For example, when the hydraulic oil is lower than 60°C, there is no need to cool the hydraulic oil. The oil outlet in the second proportional valve 51 connected to the hydraulic oil tank 53 is fully opened, and the radiator connected to the hydraulic oil radiator 50 is fully closed.

[0095] Specifically, a temperature sensor 70 is also provided on the hydraulic oil thermal management circuit 5. The temperature sensor 70 is arranged at the oil outlet of the hydraulic oil tank 53. The second proportional valve 51 is communicatively connected with the vehicle controller. The vehicle controller controls the oil outlet ratio of the two oil outlets in the second proportional valve 51 according to the feedback data of the temperature sensor 70.

[0096] like Figure 8As shown, in the embodiment of the present invention, the hybrid thermal management system also includes a thermal management circuit of the battery pack 60, and the thermal management circuit of the battery pack 60 includes a battery heating circuit and a battery heat dissipation circuit. The battery heating circuit is provided with an electric heating device 61 that can heat the coolant, and the battery heat dissipation circuit is provided with a cold pump device 62 that can forcefully cool the coolant. A second heat dissipation fan 65 is provided on one side of the battery condenser 621 in the cold pump device 62. Compared with the integrated arrangement of the thermal management circuits described above, the battery thermal management circuit 6 is independently arranged, and its main purpose is to meet the temperature requirements of the battery pack 60. The battery heating circuit is used to heat the battery pack 60 in a low temperature environment so that the battery pack 60 can be at an optimal operating temperature.

[0097] It is understandable that the suitable temperature of the existing vehicle battery pack 60 generally does not exceed 40°C, and the maximum allowable temperature generally does not exceed 60°C. In the above-mentioned thermal management loop, the heat dissipation temperature of the engine 33, drive motor and other actuators is generally above 60°C. There is a large difference in the temperature control range of the two. Obviously, the independent setting of the battery thermal management loop 6 can more effectively control the temperature of the battery pack 60 and ensure the safety and efficiency of the battery pack 60.

[0098] Specifically, the battery heating circuit also includes a third expansion water tank 63, a second water pump 64 and a temperature sensor 70. The third expansion water tank 63 is used to replenish the coolant for the battery heating circuit in time. The battery heat dissipation circuit specifically includes a pressure sensor 66, a battery condenser 621, a compressor 622 and a temperature sensor 70. The battery condenser 621 and the compressor 622 constitute the above-mentioned cold pump device 62. The temperature sensor 70 and the pressure sensor 66 in the battery heat dissipation circuit and the battery heating circuit are also connected to the battery controller. The battery controller should be designed with a control program according to parameters such as temperature and pressure, and connected to the vehicle controller to independently adjust the working temperature of the battery pack 60 in real time and ensure that the pressure in the battery heat dissipation circuit does not exceed the safe working pressure of the battery pack 60. Preferably, the electric heating device 61 is set as a PTC heater. The PTC heater can be made into an independent module, which is convenient to arrange. It can also be designed into a special shape according to the space structure provided by the vehicle, and can be flexibly arranged and easy to install.

[0099] More specifically, the heat dissipation medium in the battery heating circuit is a coolant, which has a large specific heat capacity. It can be used to quickly increase the temperature of the battery pack 60 after being heated by the electric heating device 61, and can also assist the battery pack 60 in dissipating heat when the electric heating device 61 is turned off; the heat dissipation medium in the battery heat dissipation circuit is a condensing agent. When the temperature of the battery pack 60 is high, the commonly used coolant cannot meet the cooling requirements of the battery pack 60. The condensing agent can be used to force the battery pack 60 to maintain a suitable operating temperature.

[0100] In a specific embodiment of the present invention, the hybrid thermal management system includes a cabin air-conditioning thermal management circuit, an electric drive thermal management circuit 2, an engine thermal management circuit 3, a transmission thermal management circuit 4 and a hydraulic oil thermal management circuit 5. Except for the cabin air-conditioning thermal management circuit, the remaining thermal management circuits are all provided with a temperature sensor 70 and a flow controller, and the engine thermal management circuit 3 includes an engine 33 intercooler heat dissipation circuit and an engine 33 water-cooling heat dissipation circuit, and the electric drive thermal management circuit 2 includes multiple electric drive heat dissipation circuits. Specifically, the outlet water temperature of the engine 33 is required to be less than 97°C, the intake air temperature of the intercooler is required to be less than 75°C, the outlet water temperature of the working motor 23 is required to be less than 65°C, the hydraulic oil temperature is required to be less than 75°C, and the gearbox oil temperature is required to be less than 75°C. According to the above temperature requirements, the opening of the clutch device 81 is set as shown in Table 1. The opening of the clutch device 81 indicates the contact state between the clutch and the drive shaft of the first cooling fan 82. The opening of 0% indicates that the clutch and the drive shaft of the first cooling fan 82 are completely disconnected, and the speed of the first cooling fan 82 is 0. The opening of 100% indicates that the clutch and the drive shaft of the first cooling fan 82 have the same speed. Among them, when the cabin air conditioner is turned on, the opening of the clutch device 81 is 100%. When the cabin air conditioner is turned off, the opening of the clutch device 81 is set according to the heat dissipation needs of the remaining thermal management circuits.

[0101] Table 1

[0102]

[0103]

[0104] In order to achieve the above objectives, the present invention also provides a hybrid tractor, wherein the hybrid tractor includes the above hybrid thermal management system. Since the hybrid tractor adopts all the technical solutions of the above embodiments, it has at least the above beneficial effects, which will not be described one by one here.

[0105] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0106] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0107] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0108] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A hybrid thermal management system, characterized in that: The hybrid thermal management system comprises: A cabin air conditioning thermal management circuit having an air conditioning condenser (10); An electric drive thermal management circuit (2) having an electric drive radiator (20); An engine thermal management circuit (3) having an engine radiator assembly (30); The air-conditioning condenser (10), the electric drive radiator (20) and the engine radiator assembly (30) are arranged side by side in a horizontal direction on the chassis, and share a first cooling fan (82), and the first cooling fan (82) is arranged on a side of the engine radiator assembly (30) away from the electric drive radiator (20).

2. The hybrid thermal management system according to claim 1, characterized in that: The hybrid thermal management system further comprises a clutch device (81), wherein an active end of the clutch device (81) is connected to an output shaft of the engine (33), and a driven end of the clutch device (81) is connected to the first cooling fan (82).

3. The hybrid thermal management system according to claim 2, characterized in that: The hybrid thermal management system further comprises a transmission thermal management circuit (4). The transmission thermal management circuit (4) comprises a transmission radiator (40). The transmission radiator (40) and the electric drive radiator (20) are arranged in the same row.

4. The hybrid thermal management system according to claim 3, characterized in that: The hybrid thermal management system further comprises a hydraulic oil thermal management circuit (5), wherein the hydraulic oil thermal management circuit (5) comprises a hydraulic oil radiator (50), wherein the hydraulic oil radiator (50) and the engine radiator assembly (30) are arranged in sequence and spaced apart in a height direction.

5. The hybrid thermal management system according to claim 4, characterized in that: The hybrid thermal management system further comprises a vehicle controller and a temperature detection component, wherein the temperature detection component is used to respectively detect the circuit temperatures of the electric drive thermal management circuit (2), the engine thermal management circuit (3), the transmission thermal management circuit (4) and the hydraulic oil thermal management circuit (5), and the vehicle controller is respectively connected to the temperature detection component and the controller of the clutch device (81) and is configured as follows: Acquiring the loop temperature of each thermal management loop detected by the temperature detection component; Determining corresponding clutch opening values ​​according to the circuit temperature of each thermal management circuit; The clutch opening value with the largest value is selected as the output opening value, and the current opening of the clutch device (81) is adjusted to the output opening value.

6. The hybrid thermal management system according to claim 5, characterized in that: The electric drive thermal management circuit (2), the engine thermal management circuit (3), the transmission thermal management circuit (4) and the hydraulic oil thermal management circuit (5) are all provided with a flow controller that is communicatively connected to the vehicle controller, and after obtaining the circuit temperature of each thermal management circuit detected by the temperature detection component, the method further includes: Determine the corresponding output flow value according to the loop temperature of each thermal management loop; A flow controller in a corresponding thermal management loop is controlled according to the output flow value to adjust the flow of the heat dissipation medium in the radiator.

7. The hybrid thermal management system according to claim 1, characterized in that: The electric drive thermal management circuit (2) has a plurality of electric drive heat dissipation circuits, the water inlet of each of the electric drive heat dissipation circuits is connected to the water outlet of the electric drive radiator (20), and the water outlet of each of the electric drive heat dissipation circuits is connected to the water inlet of the electric drive radiator (20), each of the electric drive heat dissipation circuits flows through at least two electric drive devices, and the at least two electric drive devices are arranged in sequence along the circuit flow direction from low to high according to the heat dissipation temperature, and the flow rate required for heat dissipation of any electric drive device flowing through each of the electric drive heat dissipation circuits is within the same flow rate range, and the total resistance of all the electric drive devices flowing through the plurality of electric drive heat dissipation circuits is within the same resistance range.

8. The hybrid thermal management system according to claim 1, characterized in that: The engine radiator assembly (30) comprises an engine intercooler radiator (31) and an engine water-cooler radiator (32), wherein the engine intercooler radiator (31) and the engine water-cooler radiator (32) are arranged at intervals in the height direction, and the engine intercooler radiator (31) is respectively connected to the air outlet and air inlet of the compressor of the engine (33), and the engine water-cooler radiator (32) is respectively connected to the water inlet and water outlet of the engine (33), and the air inlet and the water outlet are both provided with temperature sensors (70), and a thermostat (34) configured as a flow controller is integrated in the engine (33), and the thermostat (34) is connected to the circuit between the water inlet and the water outlet.

9. The hybrid thermal management system according to claim 4, characterized in that: The transmission thermal management circuit (4) is also provided with a gearbox axle (43), a first hydraulic pump (42) and a first proportional valve (41) serving as a flow controller, wherein an input shaft of the first hydraulic pump (42) is connected to an output shaft of the engine (33), and the first proportional valve (41) is provided with two oil outlets, one of which is connected to the gearbox and the other is connected to the transmission radiator (40).

10. The hybrid thermal management system according to claim 5, characterized in that: The hydraulic oil thermal management circuit (5) is also provided with a hydraulic oil tank (53), a second hydraulic pump (52) and a second proportional valve (51) serving as a flow controller, wherein the input shaft of the second hydraulic pump (52) is connected to the output shaft of the engine (33), and the second proportional valve (51) is provided with two oil outlets, one of which is connected to the hydraulic oil tank (53) and the other is connected to the hydraulic oil radiator (50).

11. The hybrid thermal management system according to any one of claims 1 to 10, characterized in that: The hybrid thermal management system further comprises a battery thermal management circuit (6), wherein the battery thermal management circuit (6) comprises a battery heating circuit and a battery heat dissipation circuit, wherein the battery heating circuit is provided with an electric heating device (61) capable of heating the coolant, wherein the battery heat dissipation circuit is provided with a cold pump device (62) capable of forcibly cooling the coolant, and wherein a second heat dissipation fan (65) is provided on one side of a battery condenser (621) in the cold pump device (62).

12. A hybrid tractor, characterized in that: The hybrid tractor comprises a hybrid thermal management system according to any one of claims 1 to 11.

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