Transmission hydraulic system, transmission, powertrain, and vehicle

Abstract

The application discloses a transmission hydraulic system, a transmission, a power assembly and a vehicle. The transmission hydraulic system comprises a hydraulic oil tank, a first cooling lubricating oil path, the first cooling lubricating oil path is suitable for connecting the hydraulic oil tank and a generator, and the first cooling lubricating oil path comprises a first on-off valve, the first on-off valve is used for selectively controlling oil flow of the first cooling lubricating oil path to the generator. According to the transmission hydraulic system provided by the embodiment of the application, energy waste can be avoided, and the oil can be reasonably used to cool the generator.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and in particular to a transmission hydraulic system, transmission, powertrain, and vehicle. Background Technology

[0002] Hybrid vehicles typically include a drive motor, a generator, and an engine, with the generator usually connected to the engine drive.

[0003] In hybrid vehicles, the transmission hydraulic system typically continuously cools the generator. However, since the generator is not in generator mode throughout the entire vehicle's operation, and the generator generates little or no heat when the vehicle is in pure electric mode, there is energy waste in the transmission hydraulic system. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one object of the present invention is to provide a transmission hydraulic system that avoids energy waste and makes efficient use of hydraulic fluid to cool the generator.

[0005] The present invention also proposes a transmission having the above-described transmission hydraulic system.

[0006] The present invention also proposes a powertrain having the above-mentioned transmission.

[0007] The present invention also proposes a vehicle having the above-described powertrain.

[0008] To achieve the above objectives, a transmission hydraulic system is provided according to a first aspect embodiment of the present invention, comprising: a hydraulic oil tank; a first cooling and lubricating oil circuit adapted to connect the hydraulic oil tank and a generator, the first cooling and lubricating oil circuit including a first on / off valve for selectively controlling whether the oil in the first cooling and lubricating oil circuit flows to the generator.

[0009] According to the transmission hydraulic system of the present invention, when the generator is in operation, the first on-off valve can be in the open state. The first on-off valve controls the flow of oil from the first cooling lubricating oil circuit to the generator, thereby cooling the generator. When the vehicle is in pure electric mode, the generator generates less heat or no heat at all. At this time, the first on-off valve can be in the closed state. The first on-off valve controls the oil from the first cooling lubricating oil circuit to not flow to the generator. This allows the oil from the first cooling lubricating oil circuit to flow to other structures, thereby avoiding energy waste and making reasonable use of the oil to cool the generator.

[0010] According to some embodiments of the present invention, the first on / off valve is configured as a one-way on / off valve that only allows oil to flow in the direction of the generator.

[0011] According to some embodiments of the present invention, the first on / off valve is an electronic valve, used to selectively control whether the oil in the first lubrication circuit flows to the generator based on the generator start / stop signal.

[0012] According to some embodiments of the present invention, the first on / off valve is a hydraulic valve; the hydraulic system further includes: a control oil circuit, the control oil circuit being connected to the hydraulic oil tank and the first cooling lubrication oil circuit, the control oil circuit including an oil pump, the oil pump being used to start and stop synchronously with the engine to pump oil to control the on / off state of the first on / off valve, thereby selectively controlling whether the oil in the first lubrication oil circuit flows to the generator.

[0013] According to some embodiments of the present invention, the control oil circuit further includes a first control valve, which is connected to the oil pump and the first on / off valve respectively. The first control valve uses the oil pumped when the oil pump starts to control the flow rate of the first on / off valve. The first control valve is a pilot proportional valve.

[0014] According to some embodiments of the present invention, the transmission hydraulic system further includes: a second cooling and lubricating oil circuit, which is connected to the oil pump and the first cooling and lubricating oil circuit respectively. When the first on / off valve is turned on, the oil pump can pump oil to flow to the generator in sequence through the second cooling and lubricating oil circuit and the first cooling and lubricating oil circuit.

[0015] According to some embodiments of the present invention, the second cooling lubrication circuit further includes: a first check valve, the first check valve being connected between the oil pump and the first cooling lubrication circuit, the first check valve being configured to allow oil to flow only to the first cooling lubrication circuit.

[0016] According to some embodiments of the present invention, the control oil circuit further includes a first control valve, which is connected to a second cooling lubrication oil circuit to regulate the flow rate of oil from the second cooling lubrication oil circuit to the first cooling lubrication oil circuit; wherein, the first control valve is a pilot proportional valve.

[0017] According to some embodiments of the present invention, the second cooling lubrication circuit further includes: a pressure regulating valve, which is connected to the first control valve. The first control valve adjusts the position of the valve core of the pressure regulating valve by changing the position of its own valve core, so as to regulate the flow rate of the oil flowing from the second cooling lubrication circuit to the first cooling lubrication circuit.

[0018] According to some embodiments of the present invention, the transmission hydraulic system further includes: a return oil circuit, which is connected to a pressure regulating valve and a hydraulic oil tank respectively. The first control valve adjusts the valve core position of the pressure regulating valve by changing the position of its own valve core, so as to regulate the flow rate of oil from the return oil circuit to the hydraulic oil tank.

[0019] According to some embodiments of the present invention, the first control valve controls the flow rate of oil from the return oil circuit to the hydraulic oil tank through a pressure regulating valve to be positively correlated with the engine speed, and the engine is adapted to connect to a generator and drive the generator to generate electricity.

[0020] According to some embodiments of the present invention, the first control valve controls the flow rate of oil from the return oil circuit to the hydraulic oil tank through a pressure regulating valve, which is negatively correlated with the temperature of the generator.

[0021] According to some embodiments of the present invention, the transmission hydraulic system further includes: a clutch actuation oil circuit, which is connected to a pressure regulating valve and a clutch respectively; a first control valve adjusts the valve core position of the pressure regulating valve by changing the position of its own valve core, thereby adjusting the flow rate of oil from the second cooling lubricating oil circuit to the clutch actuation oil circuit.

[0022] According to some embodiments of the present invention, the clutch actuation oil circuit includes: a pressure sensor for detecting the pressure of the clutch actuation oil circuit; and an actuation proportional valve connected to the pressure sensor, which adjusts the flow rate of oil from the clutch actuation oil circuit to the clutch according to the pressure feedback from the pressure sensor.

[0023] According to some embodiments of the present invention, the clutch actuation oil circuit further includes: a clutch actuation cylinder, which is connected to the actuation proportional valve and the clutch respectively, for controlling the disengagement and engagement of the clutch; and an accumulator, which is connected between the actuation proportional valve and the clutch actuation cylinder, for absorbing pressure shocks in the clutch actuation oil circuit.

[0024] According to some embodiments of the present invention, a first control valve is adapted to be connected to a vehicle controller, which is configured to: if the hydraulic pressure of the clutch is lower than the required hydraulic pressure, control the opening of the first control valve to increase to a predetermined opening, thereby increasing the flow rate through the pressure regulating valve to the clutch actuation circuit to a first predetermined value, and decreasing the flow rate through the first on / off valve to a second predetermined value.

[0025] According to some embodiments of the present invention, the first cooling lubrication circuit includes: a second check valve, which is located between the second cooling lubrication circuit and the hydraulic oil tank in the first cooling lubrication circuit, and is used to prevent the oil in the second cooling lubrication circuit from flowing back to the hydraulic oil tank through the first cooling lubrication circuit.

[0026] According to some embodiments of the present invention, the oil pump is a mechanical oil pump, which is adapted to be connected to the engine drive.

[0027] According to some embodiments of the present invention, the first cooling and lubrication circuit is also adapted to connect the hydraulic oil tank and the drive motor. The first cooling and lubrication circuit includes an electronic oil pump connected to the hydraulic oil tank. The electronic oil pump is used to pump oil from the hydraulic oil tank through the first cooling and lubrication circuit to the generator and the drive motor.

[0028] According to some embodiments of the present invention, the electronic oil pump is adapted to be connected to a vehicle controller, which is used to: control the electronic oil pump to stop working when the engine starts, so that the oil pumped by the mechanical oil pump from the hydraulic oil tank flows to the generator through the second cooling lubrication oil circuit and the first cooling lubrication oil circuit;

[0029] When the engine stops, the electronic oil pump pumps the hydraulic oil from the tank to the drive motor through the first cooling and lubrication oil circuit.

[0030] According to some embodiments of the present invention, the vehicle controller is further configured to: when the engine starts, if the oil flow rate in the second cooling lubrication circuit is lower than the required flow rate, control the electronic oil pump to pump the oil from the hydraulic tank through the first cooling lubrication circuit to the generator; when the engine stops, if the oil flow rate in the first cooling lubrication circuit is lower than a predetermined value or the electronic oil pump malfunctions, control the electronic oil pump to stop working, and control the engine to start to start the mechanical oil pump, and pump the oil from the hydraulic tank through the second cooling lubrication circuit and the first cooling lubrication circuit to the drive motor.

[0031] According to some embodiments of the present invention, the first cooling and lubrication circuit further includes: a radiator, which is connected to the electronic oil pump and the first on / off valve respectively; and a bypass valve, which is connected in parallel with the radiator and changes its on / off state according to the pressure difference between the inlet and outlet of the radiator.

[0032] According to some embodiments of the present invention, the first cooling and lubrication circuit further includes: a first branch, which is connected between the radiator and the generator, and a first on / off valve is disposed in the first branch; a second branch, which is connected between the radiator and the generator and is connected in parallel with the first branch, and the second branch is configured with a first damping orifice; a third branch, which is connected between the radiator and the clutch, and the third branch is configured with a second damping orifice; a fourth branch, which is connected between the radiator and the drive motor, and the third branch is configured with a third damping orifice; and a fifth branch, one end of which is connected between the first on / off valve and the generator, and the other end of which is connected to the transmission structure of the gearbox, and the fifth branch is configured with a fourth damping orifice.

[0033] According to some embodiments of the present invention, the electronic oil pump is mounted on the outer surface of the transmission housing.

[0034] According to some embodiments of the present invention, the transmission hydraulic system further includes: a cooling and lubrication flow control oil circuit, which is connected to a first cooling and lubrication oil circuit and a hydraulic oil tank respectively, and the cooling and lubrication flow control oil circuit controls the flow rate of oil returning from the first cooling and lubrication oil circuit to the hydraulic oil tank according to the temperature of the generator.

[0035] According to some embodiments of the present invention, the cooling and lubrication flow control oil circuit includes: a second control valve connected to a first cooling and lubrication oil circuit, the second control valve changing its on / off state according to the temperature of the generator; and a second on / off valve connected to the first cooling and lubrication oil circuit, the second control valve, and the hydraulic oil tank respectively; wherein, when the second control valve is on, it controls the second on / off valve to be on, so as to connect the first cooling and lubrication oil circuit and the hydraulic oil tank; when the second control valve is off, it controls the second on / off valve to be off, so as to disconnect the connection between the first cooling and lubrication oil circuit and the hydraulic oil tank.

[0036] A transmission according to a second aspect of the present invention is provided, including a transmission hydraulic system according to a first aspect of the present invention.

[0037] The transmission according to the second aspect embodiment of the present invention, by utilizing the transmission hydraulic system according to the first aspect embodiment of the present invention, has the advantages of low energy consumption and high stability.

[0038] A powertrain is provided according to a third aspect of the present invention, including a transmission according to a second aspect of the present invention.

[0039] The powertrain according to a third aspect embodiment of the present invention, by utilizing a transmission according to a second aspect embodiment of the present invention, has advantages such as low energy consumption and high stability.

[0040] A vehicle is provided according to a fourth aspect of the present invention, including a powertrain according to a second aspect of the present invention.

[0041] The vehicle according to the fourth aspect embodiment of the present invention, by utilizing the powertrain according to the third aspect embodiment of the present invention, has advantages such as low energy consumption and high stability.

[0042] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0043] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0044] Figure 1 This is a schematic diagram of a transmission hydraulic system according to an embodiment of the present invention.

[0045] Figure 2 This is another schematic diagram of a transmission hydraulic system according to an embodiment of the present invention.

[0046] Figure label:

[0047] 1. Transmission hydraulic system; 2. Generator; 21. Generator rotor; 22. Generator stator; 23. Generator bearing; 3. Drive motor; 31. Drive motor rotor; 32. Drive motor stator; 33. Drive motor bearing; 4. Clutch; 5. Engine; 6. Transmission structure.

[0048] Hydraulic oil tank 100

[0049] Cooling and lubricating oil circuit 200, first branch circuit 201, second branch circuit 202, third branch circuit 203, fourth branch circuit 204, fifth branch circuit 205, first on / off valve 210, second check valve 220, electronic oil pump 230, radiator 240, filter 241, bypass valve 250, first damping orifice 260, second damping orifice 270, third damping orifice 280, fourth damping orifice 290, control oil circuit 300, oil pump 310, first control valve 320.

[0050] Second cooling and lubrication oil circuit 400, pressure regulating valve 410, first check valve 420, sensor 430.

[0051] Return oil circuit 500, third check valve 510

[0052] Clutch actuator hydraulic circuit 600, pressure sensor 610, proportional valve 620, clutch actuator cylinder 630, accumulator 640

[0053] Cooling and lubrication flow control oil circuit 700, second control valve 710, second on / off valve 720

[0054] Coarse filter 800. Detailed Implementation

[0055] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention are described in detail below.

[0056] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0057] In the description of this invention, "a plurality of" means two or more.

[0058] The transmission hydraulic system 1 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0059] like Figure 1 and Figure 2 As shown, according to an embodiment of the present invention, a transmission hydraulic system 1 includes a hydraulic oil tank 100 and a first cooling and lubrication oil circuit 200.

[0060] The first cooling and lubrication oil circuit 200 is adapted to connect the hydraulic oil tank 100 and the generator 2. The first cooling and lubrication oil circuit 200 includes a first on-off valve 210, which is used to selectively control the flow of oil from the first cooling and lubrication oil circuit 200 to the generator 2. That is, the first on-off valve 210 can control whether the oil in the first cooling and lubrication oil circuit 200 can flow to the generator 2 through its own on-off control.

[0061] Understandably, when the generator 2 is in operation, the first on-off valve 210 can be in the open state, controlling the flow of oil from the first cooling lubrication circuit 200 to the generator 2, thereby cooling the generator 2. When the vehicle is in pure electric mode, the generator 2 generates less heat or no heat at all, and the first on-off valve 210 can be in the closed state, controlling the flow of oil from the first cooling lubrication circuit 200 to the generator 2. This allows the oil from the first cooling lubrication circuit 200 to flow to other structures, such as the drive motor 3, thus avoiding energy waste and making reasonable use of the oil to cool the generator 2.

[0062] According to some specific embodiments of the present invention, such as Figure 1 and Figure 2As shown, the first on / off valve 210 is configured as a one-way on / off valve that only allows oil to flow towards the generator 2. This prevents the oil in the first cooling lubrication circuit 200 from flowing back through the first on / off valve 210, preventing oil leakage or backflow from the oil pump 310 to the hydraulic oil tank 100 when the oil pump 310 is not working, thus ensuring the cooling effect on the generator 2.

[0063] According to other specific embodiments of the present invention, the first on / off valve 210 is an electronic valve, used to selectively control the flow of oil from the first lubrication circuit 200 to the generator 2 based on the start / stop signal of the generator 2. The electronic valve can be connected to a corresponding controller. When a start signal of the generator 2 is received, the electronic valve controls the flow of oil from the first lubrication circuit 200 to the generator 2; when a stop signal of the generator 2 is received, the electronic valve controls the flow of oil from the first lubrication circuit 200 to the generator 2. In this way, the oil in the first lubrication circuit 200 can be precisely controlled, which can effectively avoid energy waste and ensure the heat dissipation effect on the generator 2.

[0064] According to some other specific embodiments of the present invention, such as Figure 2 As shown, the first on / off valve 210 is a hydraulic valve; the transmission hydraulic system 1 also includes: a control oil circuit 300, which connects the hydraulic oil tank 100 and the first cooling lubrication oil circuit 200. The control oil circuit includes an oil pump 310, which is used to start and stop synchronously with the engine 5 to pump oil to control the on / off state of the first on / off valve 210, thereby selectively controlling the flow of oil from the first lubrication oil circuit 200 to the generator 2.

[0065] For example, the first cooling and lubrication circuit 200 provides low-pressure, high-flow-rate oil, primarily for lubricating and cooling the drive motor 3, generator 2, clutch 4, and transmission structure 6 of the gearbox. The oil pump 310 provides high-pressure, low-flow-rate oil to the control circuit 300, which controls the oil pressure of the transmission hydraulic system 1 to prevent excessively low oil pressure during startup, to replenish pressure or flow for clutch 4, or to prevent excessive system pressure during normal clutch 4 operation, which could damage clutch 4 components, thus achieving pressure reduction and stabilization.

[0066] It should be noted that the synchronous start-stop of oil pump 310 and engine 5 does not mean that the start time of oil pump 310 and engine 5 completely coincide. The start time of oil pump 310 and engine 5 can be staggered. However, when engine 5 starts, oil pump 310 starts accordingly, and when engine 5 shuts down, oil pump 310 shuts down accordingly.

[0067] According to an embodiment of the transmission hydraulic system 1 of the present invention, when the engine 5 is started, the oil pump 310 starts to work and pumps oil from the hydraulic oil tank 100. The oil pump 310 controls the flow of oil from the first cooling lubrication oil circuit 200 to the generator 2 through the control oil circuit 300. At this time, the oil in the first cooling lubrication oil circuit 200 can cool the generator 2. When the engine 5 stops rotating, the oil pump 310 stops pumping oil, and the oil in the first cooling lubrication oil circuit 200 does not flow to the generator 2.

[0068] In the transmission hydraulic system 1 of this invention, the start and stop of the oil pump 310 are not determined by an electrical signal. The reliability of synchronous start and stop between the oil pump 310 and the engine 5 is higher. The synchronous transmission between the oil pump 310 and the engine 5 is not affected by the external voltage intensity and magnetic field environment. In other words, the transmission hydraulic system 1 has a wider range of applicable scenarios, and there is no need to adopt anti-electromagnetic interference structures between the oil pump 310 and the engine 5, thereby reducing costs.

[0069] Thus, the transmission hydraulic system 1 according to the embodiment of the present invention has the advantages of low energy consumption and high stability.

[0070] Furthermore, such as Figure 2 As shown, the control oil circuit 300 also includes a first control valve 320, which is connected to the oil pump 310 and the first on / off valve 210 respectively. The first control valve 320 uses the oil pumped by the oil pump 310 when it starts to control the flow rate to the first on / off valve 210.

[0071] For example, the first control valve 320 can be a direct-drive two-position three-way solenoid valve. The inlet of the first control valve 320 is connected to the oil pump 310, one outlet of the first control valve 320 is connected to the hydraulic oil tank 100, and the other outlet of the first control valve 320 is connected to the first on / off valve 210. The first control valve 320 can be controlled by the vehicle control unit (VCU). The vehicle control unit can adjust the pressure of the working port of the first control valve 320 according to the start and stop of the engine 5, thereby controlling the flow to the first on / off valve 210. The opening and closing of the first on / off valve 210 is also controlled by the first control valve 320, thereby better controlling whether to supply oil to the generator 2.

[0072] According to some specific embodiments of the present invention, such as Figure 2As shown, the transmission hydraulic system 1 also includes a second cooling and lubrication oil circuit 400. The second cooling and lubrication oil circuit 400 is connected to the oil pump 310 and the first cooling and lubrication oil circuit 200 respectively. When the first on-off valve 210 is open, the oil pump 310 can pump oil through the second cooling and lubrication oil circuit 400 and the first cooling and lubrication oil circuit 200 sequentially to the generator 2. That is, when the first control valve 320 controls the first on-off valve 210 to open, the oil pumped by the oil pump 310 can flow to the generator 2 through the second cooling and lubrication oil circuit 400 and the first cooling and lubrication oil circuit 200, thus the control oil circuit 300 can control the cooling effect of the generator 2.

[0073] In this way, when the flow rate of the control oil circuit 300 is sufficient and has a surplus, the control oil circuit 300 will channel the excess oil into the first cooling lubrication oil circuit 200 through the second cooling lubrication oil circuit 400, thereby improving the energy efficiency of the transmission hydraulic system 1. When the electronic oil pump 230 of the first cooling lubrication oil circuit 200 malfunctions, the oil in the control oil circuit 300 can also flow into the first cooling lubrication oil circuit 200 through the second cooling lubrication oil circuit 400, resulting in higher system redundancy, ensuring the cooling effect and reliability of the transmission hydraulic system 1, and reducing the power load on the first cooling lubrication oil circuit 200.

[0074] According to some specific embodiments of the present invention, such as Figure 2 As shown, the second cooling and lubrication circuit 400 also includes a first check valve 420, which is connected between the oil pump 310 and the first cooling and lubrication circuit 200. The first check valve 420 is configured to allow oil to flow only to the first cooling and lubrication circuit 200.

[0075] In this way, by setting the first check valve 420, the oil in the first cooling lubrication circuit 200 can be prevented from flowing to the second cooling lubrication circuit 400 and the control circuit 300, ensuring sufficient oil flow in the first cooling lubrication circuit 200 and reducing the risk of oil leakage in the first cooling lubrication circuit 200.

[0076] The first control valve 320 is a pilot proportional valve, which is connected to the second cooling and lubrication oil circuit 400 to regulate the flow rate of oil from the second cooling and lubrication oil circuit 400 to the first cooling and lubrication oil circuit 200.

[0077] By setting the first control valve 320 as a pilot proportional valve, the flow rate required for lubrication and cooling of the generator 2 by the transmission hydraulic system 1 and the system pressure required for engagement of the clutch 4 can be continuously and linearly adjusted. This results in small pressure fluctuations, a compact structure, concentrated functions, and effectively reduced costs.

[0078] According to some specific embodiments of the present invention, such as Figure 2As shown, the second cooling and lubrication oil circuit 400 includes a pressure regulating valve 410. The pressure regulating valve 410 is connected to the first control valve 320. The first control valve 320 adjusts the position of the valve core of the pressure regulating valve 410 by changing the position of its own valve core, thereby adjusting the flow rate of oil from the second cooling and lubrication oil circuit 400 to the first cooling and lubrication oil circuit 200.

[0079] In this way, the flow rate of oil from the second cooling and lubricating oil circuit 400 to the first cooling and lubricating oil circuit 200 can be adjusted by the pressure regulating valve 410, thereby changing the amount and pressure of oil in the first cooling and lubricating oil circuit 200.

[0080] According to some specific embodiments of the present invention, such as Figure 2 As shown, the transmission hydraulic system 1 also includes a return oil line 500, which is connected to the pressure regulating valve 410 and the hydraulic oil tank 100 respectively. The first control valve 320 adjusts the valve core position of the pressure regulating valve 410 by changing the position of its own valve core, so as to regulate the flow rate of oil from the return oil line 500 to the hydraulic oil tank 100.

[0081] By setting up the return oil circuit 500, excess oil in the second cooling lubrication oil circuit 400 and the control oil circuit 300 can be returned to the hydraulic oil tank 100 through the pressure regulating valve 410. A sensor 430 is connected to the oil outlet of the oil pump 310 to detect the pressure at the oil outlet of the oil pump 310. The sensor 430 can be connected to the transmission controller, which is connected to the vehicle controller. The vehicle controller can adjust the valve core position of the pressure regulating valve 410 through the first control valve 320 according to the pressure at the oil outlet of the oil pump 310, so as to regulate the flow rate of oil from the return oil circuit 500 to the hydraulic oil tank 100, thereby regulating the pressure at the oil outlet of the oil pump 310 to achieve normal operation of the oil pump 310.

[0082] For example, the liquid-cooled oil tank 100 is connected to a coarse filter 800. The coarse filter 800 performs coarse filtration on the oil flowing from the liquid-cooled oil tank 100 to the oil pump 310. The oil at the outlet of the return oil line 500 is located at the bottom of the coarse filter 800 to avoid the oil being filtered repeatedly by the coarse filter 800 and to reduce the oil travel.

[0083] According to some specific embodiments of the present invention, such as Figure 2 As shown, the first control valve 320 controls the flow rate of oil from the return oil circuit 500 to the hydraulic oil tank 100 through the pressure regulating valve 410 to be positively correlated with the speed of the engine 5.

[0084] When the engine speed of engine 5 increases, the pump flow rate of oil pump 310 also increases. However, at this time, the flow rate required by transmission hydraulic system 1 may be lower than the pump flow rate of oil pump 310. Therefore, it is necessary to control the flow rate of oil from return oil circuit 500 to hydraulic oil tank 100 to increase, so as to drain the excess oil pumped out by oil pump 310 and avoid damage to transmission hydraulic system 1 due to excessive oil pressure.

[0085] When the speed of engine 5 decreases, the pumping flow of oil pump 310 also decreases. Therefore, it is necessary to control the flow of oil from return oil circuit 500 to hydraulic oil tank 100 to decrease accordingly, so that the oil pumped out by oil pump 310 can be distributed more to clutch 4, generator 2, drive motor 3, transmission structure 6 and other structures to meet the needs of transmission hydraulic system 1.

[0086] According to some specific embodiments of the present invention, such as Figure 2 As shown, the first control valve 320 controls the flow rate of oil from the return oil circuit 500 to the hydraulic oil tank 100 through the pressure regulating valve 410, which is negatively correlated with the temperature of the generator 2.

[0087] When the temperature of generator 2 rises, the flow rate of oil from control return oil circuit 500 to hydraulic oil tank 100 decreases, so that more oil from control return oil circuit 500 flows to generator 2, improving the cooling effect on generator 2; when the temperature of generator 2 falls, the flow rate of oil from control return oil circuit 500 to hydraulic oil tank 100 increases, so that less oil from control return oil circuit 500 flows to generator 2, improving the working efficiency of transmission hydraulic system 1.

[0088] Those skilled in the art will understand that the flow rate of the oil from the return oil passage 500 to the hydraulic oil tank 100 is negatively correlated with the temperature of the transmission clutch 4, or the flow rate of the oil from the return oil passage 500 to the hydraulic oil tank 100 is negatively correlated with the temperature of the transmission drive motor 3, or the flow rate of the oil from the return oil passage 500 to the hydraulic oil tank 100 is negatively correlated with the temperature of the transmission structure 6, or the flow rate of the oil from the return oil passage 500 to the hydraulic oil tank 100 is negatively correlated with the temperatures of the transmission clutch 4, the drive motor 3, and the transmission structure 6.

[0089] According to some specific embodiments of the present invention, such as Figure 2 As shown, the transmission hydraulic system 1 also includes a clutch actuation oil circuit 600, which is connected to the pressure regulating valve 410 and the clutch 4 respectively. The first control valve 320 adjusts the valve core position of the pressure regulating valve 410 by changing the position of its own valve core, so as to regulate the flow rate of the oil from the second cooling lubrication oil circuit 400 to the clutch actuation oil circuit 600.

[0090] By setting up the clutch execution oil circuit 600, the first control valve 320 can change the flow rate of oil from the second cooling lubrication oil circuit 400 to the clutch execution oil circuit 600 by adjusting the valve core position of the pressure regulating valve 410, thereby changing the pressure of the clutch execution oil circuit 600. The pressure of the clutch execution oil circuit 600 can control the disengagement and engagement of the clutch 4, realizing the switching of drive modes.

[0091] According to some specific embodiments of the present invention, such as Figure 2 As shown, the clutch actuation oil circuit 600 includes a pressure sensor 610 and an actuation proportional valve 620. The pressure sensor 610 is used to detect the pressure in the clutch actuation oil circuit 600. The actuation proportional valve 620 is connected to the pressure sensor 610 and adjusts the flow rate of the oil from the clutch actuation oil circuit 600 to the clutch 4 according to the pressure feedback from the pressure sensor 610.

[0092] For example, the proportional valve 620 can be a two-position three-way direct-drive proportional solenoid valve. The inlet of the proportional valve 620 is connected to the outlet of the oil pump 310, one outlet of the proportional valve 620 is connected to the hydraulic oil tank 100, and the other outlet of the proportional valve 620 is connected to the clutch 4. Additionally, the pressure sensor 610 can send the detected pressure of the clutch actuator oil circuit 600 to the transmission controller, which then adjusts the opening of the proportional valve 620's outlet based on the pressure in the clutch actuator oil circuit 600.

[0093] In this way, by associating the outlet opening of the proportional valve 620, which is connected to the clutch 4, with the pressure of the clutch actuator oil circuit 600, a stable pressure of oil can be provided to the clutch actuator oil circuit 600, ensuring the reliability of the clutch 4's engagement and disengagement positions and reducing the probability of the clutch 4 being damaged due to excessive pressure. Furthermore, by connecting one outlet of the proportional valve 620 to the hydraulic oil tank 100, when the proportional valve 620 is not in operation, the oil in the proportional valve 620 can be returned to the hydraulic oil tank 100, improving oil utilization and reducing the pressure within the proportional valve 620 for its next application.

[0094] In this embodiment of the invention, a proportional valve 620 is used to achieve real-time control and regulation of the control pressure and flow of the clutch 4. It has the advantages of easy control, simple structure, low hysteresis, fast response, high efficiency and good reliability.

[0095] According to some specific embodiments of the present invention, such as Figure 2 As shown, the clutch actuation oil circuit 600 also includes a clutch actuation cylinder 630 and an accumulator 640.

[0096] The clutch actuator cylinder 630 is connected to the proportional valve 620 and the clutch 4 respectively, and is used to control the disengagement and engagement of the clutch 4. The accumulator 640 is connected between the proportional valve 620 and the clutch actuator cylinder 630, and is used to absorb the pressure shock of the clutch actuator oil circuit 600.

[0097] For example, the clutch actuator cylinder 630 is connected to the other outlet of the proportional valve 620. The clutch actuator cylinder 630 controls the disengagement and engagement of the clutch 4 through the movement of its piston. By adjusting the opening of the outlet of the proportional valve 620 connected to the clutch actuator cylinder 630, the flow rate and pressure within the clutch actuator cylinder 630 can be adjusted to control the position of the piston in the clutch actuator cylinder 630. The accumulator 640 is connected to the other outlet of the proportional valve 620. The accumulator 640 is used to compensate for the pressure and flow rate of the clutch actuator oil circuit 600 during gear shifting, preventing oil shock and malfunction of the clutch actuator cylinder 630, and thus stabilizing the pressure of the clutch 4.

[0098] According to some specific embodiments of the present invention, the first control valve 320 is adapted to be connected to a vehicle controller, which is used to: increase the opening of the first control valve 320 to a predetermined opening if the hydraulic pressure of the clutch actuator oil circuit 600 is lower than the required hydraulic pressure, thereby increasing the flow rate of the pressure regulating valve 410 to the clutch actuator oil circuit 600 to a first predetermined value, and decreasing the flow rate of the first control valve 320 to the first on / off valve 210 to a second predetermined value.

[0099] In other words, if the hydraulic pressure at the clutch actuator oil circuit 600 is lower than the required hydraulic pressure, the flow rate to the clutch actuator oil circuit 600 needs to be adjusted in a timely manner. The first control valve 320 increases its opening to a predetermined opening, which increases the flow rate from the pressure regulating valve 410 to the clutch actuator oil circuit 600. When the first predetermined value is reached, the hydraulic pressure in the clutch actuator oil circuit 600 can gradually reach the required hydraulic pressure. Correspondingly, the flow rate from the first control valve 320 to the first on / off valve 210 will decrease, and the opening of the first on / off valve 210 will decrease accordingly. Through this distribution method, the clutch engagement and disengagement operation of the clutch actuator oil circuit 600 can be guaranteed, thus ensuring the vehicle's driving stability. When the hydraulic pressure in the clutch actuator oil circuit 600 is higher than the required hydraulic pressure, the opening of the first control valve 320 can be reduced, and the flow rate from the pressure regulating valve 410 to the clutch actuator oil circuit 600 can be reduced accordingly. In addition, a portion of the oil can be controlled to flow to the generator 2 through the second cooling lubrication oil circuit 400 and the first cooling lubrication oil circuit 200. The flow rate from the first control valve 320 to the first on / off valve 210 will increase, thereby increasing the flow rate to the generator 2 and ensuring the cooling effect of the generator 2.

[0100] According to some specific embodiments of the present invention, such as Figure 2As shown, the first cooling lubrication oil circuit 200 includes a second check valve 220. The second check valve 220 is located between the second cooling lubrication oil circuit 400 and the hydraulic oil tank 100 in the first cooling lubrication oil circuit 200, and is used to prevent the oil in the second cooling lubrication oil circuit 400 from flowing back to the hydraulic oil tank 100 through the first cooling lubrication oil circuit 200. By setting the second check valve 220, it is possible to prevent the oil in the second cooling lubrication oil circuit 400 from leaking through the electronic oil pump 230 (described below) or flowing back to the hydraulic oil tank 100.

[0101] According to some specific embodiments of the present invention, such as Figure 2 As shown, the return oil circuit 500 also includes a third check valve 510, which is connected to the pressure regulating valve 410 and the hydraulic oil tank 100 respectively. The third check valve 510 is configured to allow oil to flow from the pressure regulating valve 410 to the hydraulic oil tank 100 only.

[0102] This prevents the hydraulic oil in the hydraulic tank 100 from flowing directly to the pressure regulating valve 410 and affecting the valve core position of the pressure regulating valve 410, thereby improving the working stability of the transmission hydraulic system 1.

[0103] According to some specific embodiments of the present invention, such as Figure 2 As shown, the first control valve 320 controls the flow rate of oil from the return oil circuit 500 to the hydraulic oil tank 100 through the pressure regulating valve 410 to be positively correlated with the pressure of the clutch actuation oil circuit 600.

[0104] For example, the vehicle controller can obtain the pressure of the clutch actuator oil circuit 600 through the transmission controller. The vehicle controller can adjust the position of the valve core of the first control valve 320 according to the pressure of the clutch actuator oil circuit 600, thereby adjusting the position of the valve core of the pressure regulating valve 410, changing the flow rate of the oil from the control return oil circuit 500 to the hydraulic oil tank 100, and thus changing the flow rate of the oil from the control return oil circuit 500 to the clutch actuator oil circuit 600, so as to stabilize the pressure of the clutch actuator oil circuit 600.

[0105] For example, if the pressure in the clutch actuation circuit 600 is high, the flow rate of oil from the control return oil circuit 500 to the hydraulic oil tank 100 can be increased to decrease the flow rate of oil from the control return oil circuit 500 to the clutch actuation circuit 600, thereby reducing the pressure in the clutch actuation circuit 600. Conversely, if the pressure in the clutch actuation circuit 600 is low, the flow rate of oil from the control return oil circuit 500 to the hydraulic oil tank 100 can be decreased to increase the flow rate of oil from the control return oil circuit 500 to the clutch actuation circuit 600, thereby increasing the pressure in the clutch actuation circuit 600.

[0106] Oil pump 310 is a mechanical oil pump, suitable for connection to the engine 5. When the engine 5 starts, the mechanical oil pump 310 begins to work under the drive of the engine 5, pumping oil from the hydraulic oil tank 100; when the engine 5 stops rotating, the mechanical oil pump 310 stops pumping oil. Thus, the mechanical oil pump 310 is an intermittent hydraulic pump, starting and stopping synchronously with the engine 5, which can reduce system energy consumption, improve the working efficiency of the transmission hydraulic system 1, and enhance the energy efficiency in pure electric mode.

[0107] According to some specific embodiments of the present invention, such as Figure 2 As shown, the first cooling and lubrication oil circuit 200 is also adapted to connect the hydraulic oil tank 100 and the drive motor 3. The first cooling and lubrication oil circuit 200 includes an electronic oil pump 230, which is connected to the hydraulic oil tank 100. The electronic oil pump 230 is used to pump oil from the hydraulic oil tank 100 through the first cooling and lubrication oil circuit 200 to the generator 2 and the drive motor 3. The electronic oil pump 230 can be started when the engine 5 is stopped. The electronic oil pump 230 can pump oil through the first cooling and lubrication oil circuit 200 to the generator 2 and the drive motor 3, thereby providing cooling for the generator 2 and the drive motor 3 and ensuring the cooling effect of the generator 2 and the drive motor 3.

[0108] Furthermore, the electronic oil pump 230 is suitable for connection to the vehicle controller, which is used to: in series mode, if the oil flow rate in the second cooling lubrication circuit 400 is lower than the required flow rate, control the electronic oil pump 230 to pump the oil from the hydraulic oil tank 100 to the generator 2 through the first cooling lubrication circuit 200; in pure electric or parallel mode, if the oil flow rate in the first cooling lubrication circuit 200 is lower than the predetermined value or the electronic oil pump 230 malfunctions, control the electronic oil pump 230 to stop working and control the engine 5 to start the oil pump 310, so that the oil pumped from the hydraulic oil tank 100 flows sequentially through the second cooling lubrication circuit 400 and the first cooling lubrication circuit 200 to the drive motor 3.

[0109] For example, the electronic oil pump 230 can be a hydraulic pump driven by an electric motor. The electronic oil pump 230 provides the required low-pressure, high-flow-rate oil to the first cooling and lubrication circuit 200, and can operate continuously. In series mode, the engine 5, generator 2, and drive motor 3 all start working. If the oil flow rate in the second cooling and lubrication circuit 400 is lower than the required flow rate, and the required flow rate of generator 2 cannot be met, oil needs to be added. At this time, the electronic oil pump 230 starts working, and the oil pumped out by the electronic oil pump 230 flows to generator 2 through the first cooling and lubrication circuit 200 to meet the cooling requirements of generator 2.

[0110] In pure electric or parallel mode, when the cooling and lubrication flow is insufficient or the electronic oil pump 230 malfunctions and stops working, the engine 5 starts and drives the oil pump 310 to start working. In this way, under the regulation of the first control valve 320, the oil pump 310 can still supply oil to lubricate and cool the drive motor 3, generator 2, clutch 4 and gear shaft, effectively reducing the power load of the electronic oil pump 230 and improving the reliability of the hydraulic system.

[0111] In this invention, the lubrication and cooling of the generator 2 are controlled by the first control valve 320, so as to realize the logical association between cooling control and the operating status of the engine 5. When the engine 5 is stopped, the generator 2 is not cooled, reducing the waste of cooling flow. When the engine 5 is working, the generator 2 is lubricated and cooled, so as to realize the cooling flow of the generator 2 is distributed on demand, thereby improving the working efficiency of the hydraulic system.

[0112] Furthermore, the cooling and lubrication of the electric motor 2 in this invention adopts two distribution ratio control methods. In pure electric mode, the oil pump 310 supplies oil with a large distribution ratio, which increases the cooling effect of the drive motor 3 and provides coverage of EV mode operating conditions. In non-pure electric mode, the oil pump 310 and the electronic oil pump 230 supply oil together with a small distribution ratio, which balances the lubrication and cooling needs of each component and effectively reduces the energy consumption of the hydraulic system.

[0113] According to some specific embodiments of the present invention, such as Figure 2 As shown, the first cooling and lubrication circuit 200 also includes a radiator 240 and a bypass valve 250. The radiator 240 is connected to the electronic oil pump 230 and the first on / off valve 210 respectively. The bypass valve 250 is connected in parallel with the radiator 240. The bypass valve 250 changes its on / off state according to the pressure difference between the inlet and outlet of the radiator 240.

[0114] The radiator 240 is used to cool the oil in the first cooling lubrication oil circuit 200, so that the oil in the first cooling lubrication oil circuit 200 can cool the generator 2. When the pressure difference between the inlet and outlet of the radiator 240 is too large, the bypass valve 250 opens, which can effectively reduce the damage to the radiator 240 and prevent mis-valve operation. The bypass valve 250 can be a one-way bypass valve, which only allows oil to flow from the electric oil pump 230 to the generator 2.

[0115] According to some specific embodiments of the present invention, such as Figure 2 As shown, the first cooling and lubrication oil circuit 200 also includes a first branch 201 and a second branch 202. The first branch 201 is connected between the radiator 240 and the generator 2, and a first on / off valve 210 is provided in the first branch 201. The second branch 202 is connected between the radiator 240 and the generator 2 and is connected in parallel with the first branch 201. The second branch 202 is constructed with a first damping orifice 260.

[0116] In this way, when the engine 5 starts, the oil in the first cooling and lubrication circuit 200 can dissipate heat for the generator 2 through the first branch 201 and the second branch 202, thereby improving the heat dissipation effect of the generator 2; when the engine 5 stops rotating, the oil in the first cooling and lubrication circuit 200 can dissipate heat for the generator 2 only through the second branch 202, thereby reducing energy consumption and improving working efficiency.

[0117] According to some specific embodiments of the present invention, such as Figure 2 As shown, the first cooling and lubrication circuit 200 also includes a third branch 203, a fourth branch 204 and a fifth branch 205.

[0118] The third branch 203 connects the radiator 240 and the clutch 4, and is equipped with a second damping orifice 270. The fourth branch 204 connects the radiator 240 and the drive motor 3, and is equipped with a third damping orifice 280. One end of the fifth branch 205 connects the first on / off valve 210 and the generator 2, and the other end connects to the transmission structure 6 of the gearbox. The transmission structure 6 may include at least one of the following structures: bearings, gears, or drive shafts. The fifth branch 205 is equipped with a fourth damping orifice 290. In this way, the first cooling and lubrication oil circuit 200 can cool the drive motor 3, the clutch 4, and the transmission structure 6 of the gearbox.

[0119] For example, the generator 2 may include a generator rotor 21, a generator stator 22 and a generator bearing 23. The second branch 202 provides heat dissipation for the generator rotor 21, generator stator 22 and generator bearing 23. The second branch 202 is provided with a plurality of first damping holes 260 corresponding to the generator rotor 21, generator stator 22 and generator bearing 23.

[0120] The drive motor 3 includes a drive motor rotor 31, a drive motor stator 32, and a drive motor bearing 33. The third branch 203 provides heat dissipation for the drive motor rotor 31, drive motor stator 32, and drive motor bearing 33. The fourth branch 204 is provided with a plurality of third damping holes 280 corresponding to the drive motor rotor 31, drive motor stator 32, and drive motor bearing 33.

[0121] According to some specific embodiments of the present invention, such as Figure 2 As shown, the first cooling and lubrication oil circuit 200 also includes a filter 241, which is connected to the outlet of the radiator 240. The filter 241 is used to further filter the oil discharged by the electronic oil pump 230 to prevent the oil from becoming clogged through the first damping orifice 260, the second damping orifice 270, the third damping orifice 280, and the fourth damping orifice 290.

[0122] For example, filter 241 and radiator 240 can be connected in series, and filter 241 and radiator 240 can be connected in parallel with bypass valve 250.

[0123] According to some specific embodiments of the present invention, such as Figure 2 As shown, the electronic oil pump 230 is mounted on the outer surface of the transmission housing, and a rectangular ring seal can be used between the electronic oil pump 230 and the transmission housing. This results in a smaller total space occupied between the electronic oil pump 230 and the transmission housing, a shorter oil passage between the electronic oil pump 230 and the transmission components inside the transmission, less pressure loss along the path, and lower cost.

[0124] According to some specific embodiments of the present invention, such as Figure 2 As shown, the transmission hydraulic system 1 also includes a cooling and lubrication flow control oil circuit 700. The cooling and lubrication flow control oil circuit 700 is connected to both the first cooling and lubrication oil circuit 200 and the hydraulic oil tank 100. The cooling and lubrication flow control oil circuit 700 controls the flow rate of oil returning from the first cooling and lubrication oil circuit 200 to the hydraulic oil tank 100 based on the temperature of the generator 2. The diagram in bold illustrates the flow of oil within the cooling and lubrication flow control oil circuit 700 and the first cooling and lubrication oil circuit 200.

[0125] The cooling and lubrication flow control oil circuit 700 can adjust the flow rate in the first cooling and lubrication oil circuit 200 based on one, several, or all of the temperatures of the drive motor 3, generator 2, clutch 4, and transmission structure 6 within the transmission, obtained from the transmission controller. For example, when the engine is cold-started or the ambient temperature is low, and the drive motor 3, generator 2, clutch 4, and transmission structure 6 within the transmission do not require cooling, the flow rate of the oil in the first cooling and lubrication oil circuit 200 can be reduced by adjusting the cooling and lubrication flow control oil circuit 700. This avoids problems such as slow oil temperature rise, effectively improves transmission efficiency, and achieves energy saving and consumption reduction.

[0126] According to some specific embodiments of the present invention, such as Figure 2 As shown, the cooling and lubrication flow control oil circuit 700 includes a second control valve 710 and a second on / off valve 720.

[0127] The second control valve 710 is connected to the first cooling and lubrication oil circuit 200. The second control valve 710 changes its on / off state according to the temperature of the generator 2. The second on / off valve 720 is connected to the first cooling and lubrication oil circuit 200, the second control valve 710, and the hydraulic oil tank 100. Specifically, when the second control valve 710 is on, it controls the second on / off valve 720 to be on, so that the second on / off valve 720 connects the first cooling and lubrication oil circuit 200 and the hydraulic oil tank 100; when the second control valve 710 is off, it controls the second on / off valve 720 to be off, so that the second on / off valve 720 disconnects the connection between the first cooling and lubrication oil circuit 200 and the hydraulic oil tank 100.

[0128] For example, the second control valve 710 is a two-position, three-way, direct-drive solenoid valve. The inlet of the second control valve 710 is connected to the outlet of the electronic oil pump 230, and the outlet of the second control valve 710 is connected to the liquid-cooled oil tank. When the second control valve 710 stops working, the oil inside can flow back to the liquid-cooled oil tank, reducing oil damage and preventing the second control valve 710 from operating again. The working port of the second control valve 710 is connected to the pilot port of the second on-off valve 720. The second on-off valve 720 is a two-position, two-way valve. The inlet of the second on-off valve 720 is connected to the outlet of the electronic oil pump 230, and the outlet of the second on-off valve 720 is connected to the liquid-cooled oil tank.

[0129] In addition, the second control valve 710 controls the opening of the second on / off valve 720 according to the temperature of the generator 2 in the transmission. For example, when the temperature of the generator 2 is low, the generator 2 does not need cooling. The second control valve 710 controls the opening of the second on / off valve 720 to increase so that more oil in the first cooling lubrication circuit 200 flows back to the liquid cooling oil tank through the second on / off valve 720, reducing the amount of oil in the first cooling lubrication circuit 200 and preventing the oil temperature from rising too slowly. When the temperature of the generator 2 is high, the generator 2 needs cooling. The second control valve 710 controls the opening of the second on / off valve 720 to decrease so that less oil in the first cooling lubrication circuit 200 flows back to the liquid cooling oil tank through the second on / off valve 720, so that the oil in the first cooling lubrication circuit 200 can better cool the generator 2.

[0130] Those skilled in the art will understand that the second control valve 710 can also control the opening of the second on / off valve 720 based on the temperature of the drive motor 3 of the transmission, or the second control valve 710 can also control the opening of the second on / off valve 720 based on the temperature of the clutch 4 of the transmission, or the second control valve 710 can control the opening of the second on / off valve 720 based on the temperature of the transmission structure 6 inside the transmission, or the second control valve 710 can control the opening of the second on / off valve 720 based on a combination of the temperatures of several of the generator 2, drive motor 3, clutch 4 and transmission structure 6 of the transmission, or the second control valve 710 can control the opening of the second on / off valve 720 based on a combination of all the temperatures of the generator 2, drive motor 3, clutch 4 and transmission structure 6 of the transmission.

[0131] In this embodiment of the invention, a second control valve 710 controls the total flow of the first cooling and lubrication oil circuit 200, which meets the lubrication requirements of the drive motor 3, generator 2, clutch 4 and transmission structure 6 under low temperature conditions, while overflowing excess flow, reducing friction loss and effectively improving the energy efficiency of the transmission hydraulic system 1.

[0132] In some embodiments of the present invention, the bypass valve 250, the first control valve 320, the pressure regulating valve 410, the first check valve 420, the third check valve 510, the proportional valve 620, the second control valve 710, and the second on / off valve 720 can be integrated into one unit. This results in fewer parts, extremely high functional integration, low cost, simple assembly, significantly reduced leakage in the transmission hydraulic system 1, simple and compact structure, light weight, low processing difficulty, and extremely high transmission efficiency.

[0133] The transmission according to an embodiment of the present invention is described below with reference to the accompanying drawings. The transmission includes a transmission hydraulic system 1 according to a first aspect embodiment of the present invention.

[0134] A powertrain according to an embodiment of the present invention is described below with reference to the accompanying drawings. The powertrain includes a transmission according to the above embodiment of the present invention.

[0135] The transmission according to an embodiment of the present invention, by utilizing the transmission hydraulic system 1 according to an embodiment of the present invention, has the advantages of low energy consumption and high stability.

[0136] The powertrain according to embodiments of the present invention, by utilizing the transmission according to the above embodiments of the present invention, has advantages such as low energy consumption and high stability.

[0137] The following description, with reference to the accompanying drawings, describes a vehicle according to an embodiment of the present invention, the vehicle including a powertrain according to the above-described embodiment of the present invention.

[0138] The vehicle according to the embodiments of the present invention, by utilizing the powertrain according to the above embodiments of the present invention, has advantages such as low energy consumption and high stability.

[0139] The transmission hydraulic system 1, transmission, powertrain, and other components and operations of the vehicle according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0140] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0141] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A transmission hydraulic system, characterized in that, include: Hydraulic oil tank; A first cooling and lubrication oil circuit, adapted to connect the hydraulic oil tank and the generator, the first cooling and lubrication oil circuit including a first on / off valve, the first on / off valve being used to selectively control whether the oil in the first cooling and lubrication oil circuit flows to the generator; The first on / off valve is a hydraulic valve; the hydraulic system further includes: A control oil circuit is provided, which connects the hydraulic oil tank and the first cooling and lubrication oil circuit. The control oil circuit includes an oil pump, which is used to start and stop the engine synchronously to pump oil to control the opening and closing of the first on / off valve, thereby selectively controlling whether the oil in the first cooling and lubrication oil circuit flows to the generator. The oil pump is a mechanical oil pump, which is suitable for connection to the engine drive. The first cooling and lubrication circuit is also adapted to connect the hydraulic oil tank and the drive motor, and the first cooling and lubrication circuit includes: An electronic oil pump is connected to the hydraulic oil tank and is used to pump oil from the hydraulic oil tank through the first cooling and lubrication oil circuit to the generator and the drive motor. The electronic oil pump is suitable for connection to the vehicle controller; The second cooling and lubricating oil circuit is connected to the oil pump and the first cooling and lubricating oil circuit respectively. The vehicle controller is used for: When the engine starts, the electronic oil pump is controlled to stop working, so that the oil pumped by the mechanical oil pump from the hydraulic oil tank flows to the generator through the second cooling lubrication oil circuit and the first cooling lubrication oil circuit; When the engine stops, the electronic oil pump controls the oil pumped from the hydraulic oil tank to flow to the drive motor through the first cooling and lubrication oil circuit; When the engine starts, if the oil flow rate in the second cooling and lubrication circuit is lower than the required flow rate, the electronic oil pump is controlled to pump the oil from the hydraulic tank through the first cooling and lubrication circuit to the generator. When the engine stops, if the oil flow rate in the first cooling and lubrication circuit is lower than a predetermined value or the electronic oil pump malfunctions, the electronic oil pump is controlled to stop working, and the engine is controlled to start to start the mechanical oil pump, and the oil pumped from the hydraulic oil tank flows to the drive motor through the second cooling and lubrication circuit and the first cooling and lubrication circuit in sequence. The first cooling and lubrication circuit also includes: A radiator, which is connected to the electronic oil pump and the first on / off valve respectively; A bypass valve is connected in parallel with the radiator, and the bypass valve changes its on / off state according to the pressure difference between the liquid inlet and the liquid outlet of the radiator. The first branch is connected between the radiator and the generator, and the first on / off valve is located in the first branch. The second branch is connected between the radiator and the generator and is in parallel with the first branch. The second branch is constructed with a first damping orifice. The third branch is connected between the radiator and the clutch, and the third branch is configured with a second damping orifice; The fourth branch is connected between the radiator and the drive motor, and the third branch is constructed with a third damping hole; The fifth branch has one end connected between the first on / off valve and the generator, and the other end connected to the transmission structure of the gearbox. The fifth branch is constructed with a fourth damping orifice. The generator includes a generator rotor, a generator stator, and a generator bearing. The second branch provides heat dissipation for the generator rotor, the generator stator, and the generator bearing. The second branch is provided with a plurality of first damping holes corresponding to the generator rotor, the generator stator, and the generator bearing. The drive motor includes a drive motor rotor, a drive motor stator, and a drive motor bearing. The third branch provides heat dissipation for the drive motor rotor, the drive motor stator, and the drive motor bearing. The fourth branch is provided with a plurality of third damping holes corresponding to the drive motor rotor, the drive motor stator, and the drive motor bearing.

2. The transmission hydraulic system according to claim 1, characterized in that, The first on / off valve is configured as a one-way on / off valve that only allows oil to flow in the direction of the generator.

3. The transmission hydraulic system according to claim 1, characterized in that, The first on / off valve is an electronic valve, used to selectively control whether the oil in the first cooling and lubrication circuit flows to the generator according to the generator's start / stop signal.

4. The transmission hydraulic system according to claim 1, characterized in that, The control oil circuit also includes a first control valve, which is connected to both the oil pump and the first on / off valve. The first control valve can control the flow rate of oil to the first on / off valve using the oil pumped when the oil pump starts. The first control valve is a pilot-operated proportional valve.

5. The transmission hydraulic system according to claim 1, characterized in that, When the first on / off valve is open, the oil pump can pump oil through the second cooling and lubrication oil circuit and the first cooling and lubrication oil circuit to the generator.

6. The transmission hydraulic system according to claim 5, characterized in that, The second cooling and lubrication circuit also includes: A first check valve is connected between the oil pump and the first cooling lubrication circuit, and the first check valve is configured to allow oil to flow only from the second cooling lubrication circuit to the first cooling lubrication circuit.

7. The transmission hydraulic system according to claim 5, characterized in that, The control oil circuit further includes a first control valve, which is connected to the second cooling and lubrication oil circuit to regulate the flow rate of oil from the second cooling and lubrication oil circuit to the first cooling and lubrication oil circuit; wherein, the first control valve is a pilot proportional valve.

8. The transmission hydraulic system according to claim 7, characterized in that, The second cooling and lubrication circuit also includes: A pressure regulating valve is connected to the first control valve. The first control valve adjusts the position of the valve core of the pressure regulating valve by changing the position of its own valve core, thereby adjusting the flow rate of oil from the second cooling and lubricating oil circuit to the first cooling and lubricating oil circuit.

9. The transmission hydraulic system according to claim 8, characterized in that, Also includes: The return oil circuit is connected to the pressure regulating valve and the hydraulic oil tank respectively. The first control valve adjusts the valve core position of the pressure regulating valve by changing the position of its own valve core, thereby adjusting the flow rate of the oil flowing from the return oil circuit to the hydraulic oil tank.

10. The transmission hydraulic system according to claim 9, characterized in that, The first control valve controls the flow rate of oil from the return oil circuit to the hydraulic oil tank through the pressure regulating valve to be positively correlated with the engine speed. The engine is adapted to connect to the generator and drive the generator to generate electricity.

11. The transmission hydraulic system according to claim 9, characterized in that, The first control valve controls the flow rate of the oil from the return oil circuit to the hydraulic oil tank through the pressure regulating valve, which is negatively correlated with the temperature of the generator.

12. The transmission hydraulic system according to claim 8, characterized in that, Also includes: The clutch actuation oil circuit is connected to the pressure regulating valve and the clutch respectively. The first control valve adjusts the valve core position of the pressure regulating valve by changing the position of its own valve core, thereby adjusting the flow rate of the oil from the second cooling and lubricating oil circuit to the clutch actuation oil circuit.

13. The transmission hydraulic system according to claim 12, characterized in that, The clutch actuation oil circuit includes: A pressure sensor is used to detect the pressure in the clutch actuation oil circuit; An actuating proportional valve is connected to the pressure sensor, and the actuating proportional valve adjusts the flow rate of oil from the clutch actuator oil circuit to the clutch based on the pressure feedback from the pressure sensor.

14. The transmission hydraulic system according to claim 13, characterized in that, The clutch actuation oil circuit also includes: A clutch actuator cylinder is connected to both the proportional valve and the clutch, and is used to control the disengagement and engagement of the clutch. An accumulator is connected between the proportional valve and the clutch actuator cylinder to absorb pressure shocks in the clutch actuator oil circuit.

15. The transmission hydraulic system according to claim 12, characterized in that, The first control valve is adapted to be connected to a vehicle controller, the vehicle controller being used for: If the hydraulic pressure in the clutch actuator circuit is lower than the required hydraulic pressure, the opening of the first control valve is increased to a predetermined opening, thereby increasing the flow rate through the pressure regulating valve to the clutch actuator circuit to a first predetermined value, and decreasing the flow rate through the first control valve to the first on / off valve to a second predetermined value.

16. The transmission hydraulic system according to claim 5, characterized in that, The first cooling and lubrication circuit also includes: The second check valve is located between the connection point of the second cooling and lubricating oil circuit and the hydraulic oil tank in the first cooling and lubricating oil circuit, and is used to prevent the oil in the second cooling and lubricating oil circuit from flowing back to the hydraulic oil tank through the first cooling and lubricating oil circuit.

17. The transmission hydraulic system according to claim 1, characterized in that, The electronic oil pump is mounted on the outer surface of the transmission housing.

18. The transmission hydraulic system according to claim 1, characterized in that, Also includes: A cooling and lubrication flow control oil circuit is provided, which is connected to the first cooling and lubrication oil circuit and the hydraulic oil tank respectively. The cooling and lubrication flow control oil circuit is used to control the flow rate of oil from the first cooling and lubrication oil circuit back to the hydraulic oil tank according to the temperature of the generator.

19. The transmission hydraulic system according to claim 18, characterized in that, The cooling and lubrication flow control oil circuit includes: The second control valve is connected to the first cooling and lubricating oil circuit, and the second control valve changes its on / off state according to the temperature of the generator. The second on / off valve is connected to the first cooling and lubricating oil circuit, the second control valve, and the hydraulic oil tank, respectively. When the second control valve is connected, it controls the second on / off valve to connect, thereby connecting the first cooling and lubricating oil circuit and the hydraulic oil tank; When the second control valve is disconnected, the second on / off valve is controlled to disconnect, thereby disconnecting the first cooling and lubricating oil circuit from the hydraulic oil tank.

20. A transmission, characterized in that, Includes the transmission hydraulic system according to any one of claims 1-19.

21. A powertrain, characterized in that, Includes a generator, an engine, and a transmission as described in claim 20.

22. A vehicle, characterized in that, Including the powertrain according to claim 21.

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