Hybrid transmission thermal management system

Abstract

The application discloses a kind of hybrid gearbox thermal management systems, including oil tank, mechanical oil pump, electronic oil pump, first drive motor and second drive motor;Mechanical oil pump and the oil inlet of electronic oil pump are connected with oil tank respectively, and the oil outlet is connected to main oil circuit in parallel, the end of main oil circuit is equipped with gear pair lubricating oil circuit and motor lubricating oil circuit, respectively for the lubricating flow of gear pair and motor;First three-position four-way electromagnetic valve is arranged between main oil circuit and motor lubricating oil circuit, and the two oil outlets of first three-position four-way electromagnetic valve are respectively connected with the lubricating oil circuit of first drive motor and second drive motor, to distribute oil in motor lubricating oil circuit by first three-position four-way electromagnetic valve.The application is provided with three electromagnetic valves in the system, and the oil output of motor cooling lubricating oil circuit can be reasonably distributed again according to the working requirement of first drive motor and second drive motor.The oil output of mechanical oil pump and electronic oil pump can be reduced.

Description

Technical Field

[0001] This invention relates to the field of hybrid power energy-saving technology, and more specifically, to a hybrid power transmission thermal management system. Background Technology

[0002] To meet fuel consumption standards for gasoline-powered vehicles, the hybridization of transmissions is an inevitable trend. Hybrid transmissions, whether P1+P3 or PS (power split) schemes, all require cooling and lubrication for two electric motors (one primary drive motor and one secondary drive motor) and gear pairs.

[0003] In existing hybrid transmission thermal management systems, two mechanical oil pumps are typically used. One pump is driven by the engine, and the other is driven by a second drive motor. This thermal management system outputs a fixed flow rate to meet the lubrication requirements of the drive motor and gears. However, this thermal management system has the following two problems:

[0004] 1. The system is equipped with two mechanical pumps. The operation of the mechanical pumps is affected by the input. When only the second drive motor is working and the vehicle is reversing, the mechanical oil pump reverses and cannot output cooling flow, thus failing to meet the cooling and lubrication requirements of the second drive motor.

[0005] 2. The system solution outputs cooling flow in a fixed flow rate form, which will inevitably lead to energy waste under certain operating conditions when the first drive motor or the second drive motor is not working, and there is no cooling flow demand or the cooling flow demand is small.

[0006] Therefore, how to provide a thermal management system that meets the cooling and lubrication requirements of the first drive motor, the second drive motor, and the gear pair under various application conditions of hybrid transmissions has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0007] The purpose of this invention is to provide a thermal management system for a hybrid power transmission to effectively solve the problems mentioned in the background art.

[0008] According to one aspect of the present invention, a hybrid power transmission thermal management system is provided, comprising an oil tank, a mechanical oil pump, an electronic oil pump, a first drive motor, and a second drive motor;

[0009] The inlet of the mechanical oil pump and the inlet of the electronic oil pump are respectively connected to the oil tank, and the outlet is connected in parallel to the main oil circuit. The end of the main oil circuit is provided with a gear pair lubrication oil circuit and a motor lubrication oil circuit, which are used for the lubrication flow of the gear pair and the motor, respectively.

[0010] A first three-position four-way solenoid valve is provided between the main oil circuit and the motor lubrication oil circuit. The two oil outlets of the first three-position four-way solenoid valve are respectively connected to the lubrication oil circuits of the first drive motor and the second drive motor, so as to distribute the oil in the motor lubrication oil circuit through the first three-position four-way solenoid valve.

[0011] A second three-position four-way solenoid valve is provided between the first drive motor and the first three-position four-way solenoid valve. The two oil outlets of the second three-position four-way solenoid valve are respectively connected to the lubrication oil circuits of the stator and rotor of the first drive motor, so as to distribute the oil in the first drive motor through the second three-position four-way solenoid valve.

[0012] A third three-position four-way solenoid valve is provided between the second drive motor and the first three-position four-way solenoid valve. The two oil outlets of the third three-position four-way solenoid valve are respectively connected to the lubrication oil circuits of the stator and rotor of the second drive motor, so as to distribute the oil in the second drive motor through the third three-position four-way solenoid valve.

[0013] Optionally, in the hybrid power transmission thermal management system according to the present invention, when the first three-position four-way solenoid valve is not working, the solenoid valve core moves to the first position, and most of the flow is output to the lubrication circuit of the second drive motor; when the first three-position four-way solenoid valve operates with a small current, the solenoid valve core moves to the second position, and the cooling flow output to the lubrication circuit of the first drive motor and the lubrication circuit of the second drive motor is the same; when the first three-position four-way solenoid valve operates with a large current, the solenoid valve core moves to the third position, and most of the flow is output to the lubrication circuit of the first drive motor.

[0014] Optionally, in the hybrid power transmission thermal management system according to the present invention, when the second three-position four-way solenoid valve is not working, the valve core moves to the first position, and most of the flow is output to the lubrication oil circuit of the first drive motor rotor; when the second three-position four-way solenoid valve operates with a small current, the valve core moves to the second position, and the cooling flow output to the lubrication oil circuit of the first drive motor stator and the lubrication oil circuit of the first drive motor rotor is the same; when the second three-position four-way solenoid valve operates with a large current, the valve core moves to the third position, and most of the flow is output to the lubrication oil circuit of the first drive motor stator.

[0015] Optionally, in the hybrid power transmission thermal management system according to the present invention, when the third three-position four-way solenoid valve is not working, the solenoid valve core moves to the first position, and most of the flow is output to the lubrication oil circuit of the second drive motor rotor; when the third three-position four-way solenoid valve operates with a small current, the solenoid valve core moves to the second position, and the cooling flow rate output to the lubrication oil circuit of the second drive motor stator and the lubrication oil circuit of the second drive motor rotor is the same; when the third three-position four-way solenoid valve operates with a large current, the solenoid valve core moves to the third position, and most of the flow is output to the lubrication oil circuit of the second drive motor stator.

[0016] Optionally, in the hybrid transmission thermal management system according to the present invention, a suction filter is provided between the oil tank and the mechanical oil pump and the electronic oil pump to perform preliminary filtration of impurities in the oil.

[0017] Optionally, in the hybrid power transmission thermal management system according to the present invention, a pressure relief branch is provided on the side of the main oil circuit, and a pressure regulating valve is provided on the pressure relief branch. When the pressure on the left side of the pressure regulating valve is greater than the spring force on the right side, the pressure of the main oil circuit can be relieved.

[0018] Optionally, according to the hybrid power transmission thermal management system of the present invention, a cooler is further provided on the main oil circuit to dissipate heat from the oil in the main oil circuit.

[0019] Optionally, according to the hybrid power transmission thermal management system of the present invention, a bypass oil circuit is also connected in parallel on the main oil circuit. The two ends of the bypass oil circuit are connected to the two ends of the cooler, and a bypass valve is provided in the bypass oil circuit. When the pressure difference between the front and rear ends of the cooler is greater than the opening pressure of the bypass valve, the bypass oil circuit is opened.

[0020] Optionally, in the hybrid power transmission thermal management system according to the present invention, a throttling orifice is provided in the gear pair lubrication oil circuit to control the lubrication flow rate of the gear pair.

[0021] Optionally, in the hybrid transmission thermal management system according to the present invention, a first check valve and a second check valve are respectively provided between the electronic oil pump and the mechanical oil pump and the main oil circuit to prevent oil in the main oil circuit from flowing back into the electronic oil pump and the mechanical oil pump.

[0022] The advantages of this invention compared to the prior art are:

[0023] 1. The system is equipped with three solenoid valves: a first three-position four-way solenoid valve, a second three-position four-way solenoid valve, and a third three-position four-way solenoid valve. These three valves allow for the re-distribution of the oil output from the motor cooling and lubrication circuit according to the operating requirements of the first and second drive motors. This reduces the oil output of the mechanical and electronic oil pumps.

[0024] 2. The system is equipped with both a mechanical oil pump and an electronic oil pump. The mechanical oil pump is driven by the engine, while the electronic oil pump is driven by a separate motor. Each hydraulic source can independently provide cooling flow to the main oil circuit. The electronic oil pump's oil supply is unaffected by vehicle speed, and can meet the high-flow cooling needs of the second drive motor even at low speeds and in reverse. During high-speed cruising, when only the first drive motor requires cooling, the electronic oil pump can be shut down, satisfying system requirements while reducing energy consumption.

[0025] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0026] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the invention and, together with their description, serve to explain the principles of the invention.

[0027] Figure 1 This is a schematic diagram of the structure of the hybrid power transmission thermal management system disclosed in this invention;

[0028] Figure 2 This is a schematic diagram of a dual-motor hybrid power transmission system in the prior art.

[0029] Explanation of reference numerals in the attached diagram: 1-Oil tank; 2-Suction filter; 3-Mechanical oil pump; 4-Electronic oil pump; 5-Pressure regulating valve; 6-First check valve; 7-Second check valve; 8-Cooler; 9-Bypass valve; 10-First three-position four-way solenoid valve; 11-Second three-position four-way solenoid valve; 12-Third three-position four-way solenoid valve; 13-First drive motor stator; 14-First drive motor rotor; 15-Second drive motor stator; 16-Second drive motor rotor; 17-Gear pair; 101-Gear pair lubrication circuit; 102-Motor lubrication circuit; 201-Second drive motor lubrication circuit; 202-First drive motor lubrication circuit; 401-Lubrication circuit of the first drive motor stator; 402-Lubrication circuit of the first drive motor rotor; 403-Lubrication circuit of the second drive motor stator; 404-Lubrication circuit of the second drive motor rotor; 501-Main oil circuit; 502-Bypass oil circuit. Detailed Implementation

[0030] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention.

[0031] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0032] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0033] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0034] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0035] according to Figure 1 As shown, the present invention provides a thermal management system for a hybrid power transmission, including an oil tank 1, a mechanical oil pump 3, an electronic oil pump 4, a first drive motor, and a second drive motor.

[0036] The inlet of the mechanical oil pump 3 and the inlet of the electronic oil pump 4 are connected to the oil tank 1, and the outlets are connected in parallel to the main oil circuit 501. The end of the main oil circuit 501 is provided with a gear pair lubrication oil circuit 101 and a motor lubrication oil circuit 102, which are used for the lubrication flow of the gear pair 17 and the motor, respectively.

[0037] A first three-position four-way solenoid valve 10 is provided between the main oil circuit 501 and the motor lubrication oil circuit 102. The two oil outlets of the first three-position four-way solenoid valve 10 are respectively connected to the lubrication oil circuits of the first drive motor and the second drive motor, so as to distribute the oil in the motor lubrication oil circuit 102 through the first three-position four-way solenoid valve 10.

[0038] A second three-position four-way solenoid valve 11 is provided between the first drive motor and the first three-position four-way solenoid valve 10. The two oil outlets of the second three-position four-way solenoid valve 11 are respectively connected to the lubrication oil circuits of the stator 13 and the rotor 14 of the first drive motor, so as to distribute the oil in the first drive motor through the second three-position four-way solenoid valve 11.

[0039] A third three-position four-way solenoid valve 12 is provided between the second drive motor and the first three-position four-way solenoid valve 10. The two oil outlets of the third three-position four-way solenoid valve 12 are respectively connected to the lubrication oil circuits of the stator 15 and the rotor 16 of the second drive motor, so as to distribute the oil in the second drive motor through the third three-position four-way solenoid valve 12.

[0040] Each of the three three-position four-way solenoid valves has three output positions, according to Figure 1 Taking the example, the first three-position four-way solenoid valve 10, the second three-position four-way solenoid valve 11, and the third three-position four-way solenoid valve 12 are all located in the first position, and from right to left they are the first position, the second position, and the third position.

[0041] Furthermore, the first three-position four-way solenoid valve 10 redistributes the flow output from the mechanical oil pump 3 and the electronic oil pump 4 according to the working state and cooling requirements of the first and second drive motors. When the first three-position four-way solenoid valve 10 is not working, the valve core moves to the first position, and most of the flow is output to the lubrication circuit 201 of the second drive motor. When the first three-position four-way solenoid valve 10 operates with a small current, the valve core moves to the second position, and the cooling flow output to the lubrication circuit 202 of the first and second drive motors is the same. When the first three-position four-way solenoid valve 10 operates with a large current, the valve core moves to the third position, and most of the flow is output to the lubrication circuit 202 of the first drive motor.

[0042] Furthermore, the second three-position four-way solenoid valve 11 can redistribute the flow of lubricating oil in the first drive motor circuit 202 according to the cooling requirements of the first drive motor stator 13 and the first drive motor rotor 14. When the second three-position four-way solenoid valve 11 is not working, the valve core moves to the first position, and most of the flow is output to the lubricating oil circuit 402 of the first drive motor rotor; when the second three-position four-way solenoid valve 11 operates with a small current, the valve core moves to the second position, and the cooling flow output to the lubricating oil circuit 401 of the first drive motor stator and the lubricating oil circuit 402 of the first drive motor rotor is the same; when the second three-position four-way solenoid valve 11 operates with a large current, the valve core moves to the third position, and most of the flow is output to the lubricating oil circuit 401 of the first drive motor stator.

[0043] Furthermore, the third three-position four-way solenoid valve 12 can redistribute the flow rate of the lubricating oil circuit 201 of the second drive motor according to the cooling requirements of the second drive motor stator 15 and the second drive motor rotor 16. When the third three-position four-way solenoid valve 12 is not working, the solenoid valve core moves to the first position, and most of the flow is output to the lubricating oil circuit 404 of the second drive motor rotor; when the third three-position four-way solenoid valve 12 operates with a small current, the solenoid valve core moves to the second position, and the cooling flow rate output to the lubricating oil circuit 403 of the second drive motor stator and the lubricating oil circuit 404 of the second drive motor rotor is the same; when the third three-position four-way solenoid valve 12 operates with a large current, the solenoid valve core moves to the third position, and most of the flow is output to the lubricating oil circuit 403 of the second drive motor stator.

[0044] like Figure 2 The diagram shows a schematic of a dual-motor hybrid transmission system in the prior art. In low-speed mode, the second drive motor operates, driving in pure electric mode. Under these conditions, the second drive motor operates while the first drive motor rotates accordingly. The second drive motor has a greater cooling requirement, while the first drive motor requires less cooling flow. At this time, the electronic oil pump 4 in the thermal management system operates, outputting cooling oil that flows through the main oil circuit 501 and then into the motor lubrication circuit 102. The first three-position four-way solenoid valve 10 is not operating. Figure 1 In the specified state, most of the flow can be allocated to the lubrication circuit 201 of the second drive motor, meeting the high-flow lubrication requirements of the second drive motor. Then, depending on the state of the second drive motor, if the stator has a large cooling requirement and the rotor has a small cooling requirement, the third three-position four-way solenoid valve 12 operates with a high current, and the valve core moves to the third position. This allows the lubrication circuit 403 leading to the stator of the second drive motor to output a large flow, while the lubrication circuit 404 leading to the rotor of the second drive motor outputs a small flow. Conversely, if the rotor of the second drive motor has a large cooling requirement and the stator has a small cooling requirement, the second three-position four-way solenoid valve 11 does not operate, allowing the lubrication circuit 403 leading to the stator to output a large flow and the lubrication circuit 404 leading to the rotor to output a small flow. Figure 1 The status output in the system enables the lubrication oil circuit 403 of the second drive motor stator to output at a small flow rate, and the lubrication oil circuit 404 of the second drive motor rotor to output at a large flow rate. When the cooling flow requirements of the second drive motor stator and rotor are comparable, the third three-position four-way solenoid valve 12 operates with a small current, and the solenoid valve core moves to the second position, so that the cooling oil leading to the lubrication oil circuit 403 of the second drive motor stator and the lubrication oil circuit 404 of the second drive motor rotor are the same.

[0045] At medium to high vehicle speeds, the second drive motor operates, the engine operates, and the first drive motor generates electricity. At this time, the mechanical oil pump 3 and the electronic oil pump 4 can jointly output flow. Since the cooling flow requirements of the first and second drive motors are similar, the first three-position four-way solenoid valve 10 outputs a small current. The solenoid valve core of the first three-position four-way solenoid valve 10 operates in the second position, resulting in the same amount of oil output to the lubrication circuit 201 of the second drive motor and the lubrication circuit 202 of the first drive motor, thus meeting the needs of both motors under this operating condition.

[0046] During high-speed cruising, the engine outputs power to drive the engine. At this time, the second drive motor rotates accordingly, while the first drive motor generates electricity. The second drive motor requires less cooling flow, while the first drive motor has a certain cooling requirement. During this time, the mechanical oil pump 3 operates under the engine's power, and the electronic oil pump 4 can be deactivated. The first three-position four-way solenoid valve 10 operates with a high current. When the solenoid valve core moves to the third position, most of the cooling flow output from the mechanical pump will flow to the lubrication circuit 202 of the first drive motor, meeting the cooling and lubrication requirements of the first drive motor.

[0047] During idling charging, the engine idles, the second drive motor is not working, and the first drive motor generates electricity. At this time, only the first drive motor has a flow requirement, while the second drive motor has no cooling flow requirement. The mechanical oil pump 3 operates under the drive of the engine, and the electronic oil pump 4 does not need to operate. The first three-position four-way solenoid valve 10 operates in the third position, allowing most of the cooling flow from the motor lubrication branch to enter the first drive motor lubrication circuit 202, thus meeting the lubrication requirements of the first drive motor.

[0048] Furthermore, a suction filter 2 is provided between the oil tank 1 and the mechanical oil pump 3 and the electronic oil pump 4 to perform preliminary filtration of impurities in the oil.

[0049] Furthermore, a pressure relief branch is provided on the side of the main oil circuit 501, and a pressure regulating valve 5 is provided on the pressure relief branch. When the pressure on the left side of the pressure regulating valve 5 is greater than the spring force on the right side, the pressure of the main oil circuit 501 can be relieved.

[0050] Furthermore, a cooler 8 is also provided on the main oil circuit 501 to dissipate heat from the oil in the main oil circuit 501.

[0051] Furthermore, a bypass oil circuit 502 is connected in parallel to the main oil circuit 501. The two ends of the bypass oil circuit 502 are connected to the two ends of the cooler 8, and a bypass valve 9 is provided in the bypass oil circuit 502. When the pressure difference between the front and rear ends of the cooler 8 is greater than the opening pressure of the bypass valve 9 (e.g., 2 bar), it indicates that the cooler 8 is blocked, the suction filter 2 is malfunctioning, and the bypass oil circuit 502 is opened.

[0052] Furthermore, a throttling orifice is provided in the gear pair lubrication oil passage 101 to control the lubrication flow of the gear pair 17, so as to prevent most of the oil in the main oil passage 501 from flowing to the gear pair lubrication oil passage 101.

[0053] Furthermore, a first check valve 6 and a second check valve 7 are respectively provided between the electronic oil pump 4 and the mechanical oil pump 3 and the main oil circuit 501 to prevent the oil in the main oil circuit 501 from flowing back into the electronic oil pump 4 and the mechanical oil pump 3.

[0054] While specific embodiments of the invention have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of the invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A thermal management system for a hybrid power transmission, characterized in that, It includes an oil tank, a mechanical oil pump, an electronic oil pump, a first drive motor, and a second drive motor; The inlet of the mechanical oil pump and the inlet of the electronic oil pump are respectively connected to the oil tank, and the outlet is connected in parallel to the main oil circuit. The end of the main oil circuit is provided with a gear pair lubrication oil circuit and a motor lubrication oil circuit, which are used for the lubrication flow of the gear pair and the motor, respectively. A first three-position four-way solenoid valve is provided between the main oil circuit and the motor lubrication oil circuit. The two oil outlets of the first three-position four-way solenoid valve are respectively connected to the lubrication oil circuits of the first drive motor and the second drive motor, so as to distribute the oil in the motor lubrication oil circuit through the first three-position four-way solenoid valve. A second three-position four-way solenoid valve is provided between the first drive motor and the first three-position four-way solenoid valve. The two oil outlets of the second three-position four-way solenoid valve are respectively connected to the lubrication oil circuits of the stator and rotor of the first drive motor, so as to distribute the oil in the first drive motor through the second three-position four-way solenoid valve. A third three-position four-way solenoid valve is provided between the second drive motor and the first three-position four-way solenoid valve. The two oil outlets of the third three-position four-way solenoid valve are respectively connected to the lubrication oil circuits of the stator and rotor of the second drive motor, so as to distribute the oil in the second drive motor through the third three-position four-way solenoid valve. When the first three-position four-way solenoid valve is not working, the valve core moves to the first position, and most of the flow is output to the lubrication circuit of the second drive motor. When the first three-position four-way solenoid valve is working with a small current, the valve core moves to the second position, and the cooling flow output to the lubrication circuit of the first drive motor is the same as that to the lubrication circuit of the second drive motor. When the first three-position four-way solenoid valve is working with a large current, the valve core moves to the third position, and most of the flow is output to the lubrication circuit of the first drive motor.

2. The hybrid power transmission thermal management system according to claim 1, characterized in that, When the second three-position four-way solenoid valve is not working, the valve core moves to the first position, and most of the flow is output to the lubrication circuit of the first drive motor rotor. When the second three-position four-way solenoid valve is working with a small current, the valve core moves to the second position, and the cooling flow output to the lubrication circuit of the first drive motor stator and the lubrication circuit of the first drive motor rotor is the same. When the second three-position four-way solenoid valve is working with a large current, the valve core moves to the third position, and most of the flow is output to the lubrication circuit of the first drive motor stator.

3. The hybrid power transmission thermal management system according to claim 1, characterized in that, When the third three-position four-way solenoid valve is not working, the valve core moves to the first position, and most of the flow is output to the lubrication circuit of the second drive motor rotor. When the third three-position four-way solenoid valve operates with a small current, the valve core moves to the second position, and the cooling flow output to the lubrication circuit of the second drive motor stator and the lubrication circuit of the second drive motor rotor is the same. When the third three-position four-way solenoid valve operates with a large current, the valve core moves to the third position, and most of the flow is output to the lubrication circuit of the second drive motor stator.

4. The hybrid power transmission thermal management system according to claim 1, characterized in that, A suction filter is provided between the oil tank and the mechanical oil pump and the electronic oil pump to perform preliminary filtration of impurities in the oil.

5. The hybrid power transmission thermal management system according to claim 4, characterized in that, A pressure relief branch is provided on the side of the main oil circuit, and a pressure regulating valve is provided on the pressure relief branch. When the pressure on the left side of the pressure regulating valve is greater than the spring force on the right side, the pressure of the main oil circuit can be relieved.

6. The hybrid power transmission thermal management system according to claim 5, characterized in that, A cooler is also provided on the main oil line to dissipate heat from the oil in the main oil line.

7. The hybrid power transmission thermal management system according to claim 6, characterized in that, A bypass oil circuit is also connected in parallel to the main oil circuit. The two ends of the bypass oil circuit are connected to the two ends of the cooler, and a bypass valve is provided in the bypass oil circuit. When the pressure difference between the front and rear ends of the cooler is greater than the opening pressure of the bypass valve, the bypass oil circuit is opened.

8. The hybrid power transmission thermal management system according to claim 1, characterized in that, The gear pair lubrication circuit is equipped with a throttling orifice to control the lubrication flow rate of the gear pair.

9. The hybrid power transmission thermal management system according to claim 1, characterized in that, The electronic oil pump and the mechanical oil pump are respectively provided with a first check valve and a second check valve between themselves and the main oil circuit to prevent oil in the main oil circuit from flowing back into the electronic oil pump and the mechanical oil pump.

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