Transmission hydraulic system, transmission, powertrain, and vehicle

Abstract

A vehicle, said vehicle comprising a powertrain, said powertrain comprising a transmission, said transmission comprising a transmission hydraulic system, and said transmission hydraulic system comprising a hydraulic fluid tank and a first cooling lubricant path. The first cooling lubricant path is suitable for connecting the hydraulic fluid tank and an electric generator, the first cooling lubricant path comprises a first on-off valve, and the first on-off valve is used for selectively controlling lubricant liquid in the first cooling lubricant path to flow to the electric generator.

Description

Transmission hydraulics, transmissions, powertrains, and vehicles

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on September 28, 2023, with application number 202311280099.0 and entitled “Transmission Hydraulic System, Transmission, Powertrain and Vehicle,” the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of vehicle technology, and in particular to a transmission hydraulic system, a transmission, a powertrain, and a vehicle. Background Art

[0004] In a hybrid vehicle, it generally includes a drive motor, a generator and an engine, and the generator is usually connected to the engine through a transmission.

[0005] Hybrid vehicles in related technologies also include a transmission hydraulic system, which usually continuously cools the generator. However, since the generator is not in the generator state throughout the entire vehicle driving process, and when the vehicle is in pure electric mode, the generator generates low heat or no heat, there is energy waste in the transmission hydraulic system.

[0006] Public content

[0007] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present application is to provide a transmission hydraulic system that can avoid energy waste and can reasonably utilize oil to cool the generator.

[0008] The present application also proposes a transmission having the above transmission hydraulic system.

[0009] The present application also provides a powertrain having the above transmission.

[0010] The present application also provides a vehicle having the above powertrain.

[0011] In order to achieve the above-mentioned objectives, according to the first aspect embodiment of the present application, a transmission hydraulic system is proposed, including: a hydraulic oil tank; a first cooling and lubricating oil circuit, the first cooling and lubricating oil circuit is suitable for connecting the hydraulic oil tank and the generator, the first cooling and lubricating oil circuit includes a first on-off valve, the first on-off valve is used to selectively control whether the oil in the first cooling and lubricating oil circuit flows to the generator.

[0012] According to the transmission hydraulic system of the embodiment of the present application, when the generator is in operation, the first on-off valve can be in the on state, and the first on-off valve controls the oil in the first cooling and lubricating oil circuit to flow to the generator, so that the oil cools the generator. When the vehicle is in pure electric mode, the generator generates low heat or no heat. At this time, the first on-off valve can be in the off state, and the first on-off valve controls the oil in the first cooling and lubricating oil circuit not to flow to the generator. In this way, the oil in the first cooling and lubricating oil circuit can flow to other structures, thereby avoiding energy waste and making rational use of the oil to cool the generator.

[0013] According to some embodiments of the present application, the first on-off valve is configured as a one-way on-off valve that only allows oil to flow toward the generator.

[0014] According to some embodiments of the present application, the first on-off valve is an electronic valve, which is used to be switched on and off according to the start / stop signal of the generator to selectively control whether the oil in the first cooling and lubricating oil circuit flows to the generator.

[0015] According to some embodiments of the present application, the first on-off valve is a hydraulic valve; the hydraulic system also includes: a control oil circuit, the control oil circuit connecting the hydraulic oil tank and the first cooling and lubricating 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 and off of the first on-off valve, thereby selectively controlling whether the oil in the first cooling and lubricating oil circuit flows to the generator.

[0016] According to some embodiments of the present application, the control oil circuit also includes a first control valve, which is respectively connected to the oil pump and the first on-off valve, and the first control valve is configured to control the flow of the first on-off valve using the oil pumped when the oil pump is started, wherein the first control valve is a pilot proportional valve.

[0017] According to some embodiments of the present application, the transmission hydraulic system further includes: a second cooling and lubricating oil circuit, wherein the second cooling and lubricating oil circuit is connected to the oil pump and the first cooling and lubricating oil circuit respectively, and the oil pump (310) is configured to pump oil through the second cooling and lubricating oil circuit and the first cooling and lubricating oil circuit in sequence to flow to the generator when the first on-off valve is turned on.

[0018] According to some embodiments of the present application, the second cooling and lubricating oil circuit also includes: a first one-way valve, which is connected between the oil pump and the first cooling and lubricating oil circuit, and the first one-way valve is configured to only allow oil to flow from the second cooling and lubricating oil circuit to the first cooling and lubricating oil circuit.

[0019] According to some embodiments of the present application, the control oil circuit also includes a first control valve, which is connected to the second cooling and lubricating oil circuit to regulate the flow rate of oil from the second cooling and lubricating oil circuit to the first cooling and lubricating oil circuit; wherein the first control valve is a pilot proportional valve.

[0020] According to some embodiments of the present application, the second cooling and lubricating oil circuit also includes: a pressure regulating valve, which is connected to the first control valve, and the first control valve adjusts the valve core position of the pressure regulating valve by changing the position of its own valve core to adjust the flow rate of oil from the second cooling and lubricating oil circuit to the first cooling and lubricating oil circuit.

[0021] According to some embodiments of the present application, the transmission hydraulic system also includes: a return oil circuit, which is respectively connected to the pressure regulating valve and the hydraulic oil tank. The first control valve adjusts the valve core position of the pressure regulating valve by changing the position of its own valve core to adjust the flow rate of oil from the return oil circuit to the hydraulic oil tank.

[0022] According to some embodiments of the present application, 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 positively correlated with the speed of the engine, and the engine is suitable for connecting to the generator and driving the generator to generate electricity.

[0023] According to some embodiments of the present application, the flow rate of oil flowing from the first control valve to the hydraulic oil tank through the pressure regulating valve and the control oil return oil circuit is negatively correlated with the temperature of the generator.

[0024] According to some embodiments of the present application, the transmission hydraulic system also includes: a clutch actuator oil circuit, which is respectively connected to the pressure regulating valve and the clutch, and the first control valve adjusts the valve core position of the pressure regulating valve by changing the position of its own valve core to adjust the flow rate of oil from the second cooling and lubricating oil circuit to the clutch actuator oil circuit.

[0025] According to some embodiments of the present application, the clutch execution oil circuit includes: a pressure sensor, which is used to detect the pressure of the clutch execution oil circuit; and an execution proportional valve, which is connected to the pressure sensor and adjusts the flow rate of oil from the clutch execution oil circuit to the clutch according to the pressure feedback from the pressure sensor.

[0026] According to some embodiments of the present application, the clutch actuator oil circuit also includes: a clutch actuator cylinder, which is respectively connected to the actuator proportional valve and the clutch, and is used to control the separation and engagement of the clutch; and an accumulator, which is connected between the actuator proportional valve and the clutch actuator cylinder, and is used to absorb the pressure shock of the clutch actuator oil circuit.

[0027] According to some embodiments of the present application, the first control valve is suitable for connecting to a vehicle controller, and the vehicle controller is used 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, so that the flow through the pressure regulating valve to the clutch execution oil circuit increases to a first predetermined value, and the flow through the first on-off valve to the first on-off valve decreases to a second predetermined value.

[0028] According to some embodiments of the present application, the first cooling and lubricating oil circuit includes: a second one-way valve, which is located between the second cooling and lubricating oil circuit and the hydraulic oil tank on 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.

[0029] According to some embodiments of the present application, the oil pump is a mechanical oil pump, and the mechanical oil pump is suitable for being transmission-connected to the engine.

[0030] According to some embodiments of the present application, the first cooling and lubricating oil circuit is also suitable for connecting the hydraulic oil tank and the drive motor, and the first cooling and lubricating oil circuit includes: an electronic oil pump, which is connected to the hydraulic oil tank, and the electronic oil pump is used to pump oil from the hydraulic oil tank to the generator and the drive motor through the first cooling and lubricating oil circuit.

[0031] According to some embodiments of the present invention, the electronic oil pump is suitable for connecting to a vehicle controller, and the vehicle controller is used to: when the engine is started, control the electronic oil pump to stop working so that the mechanical oil pump pumps the oil in the hydraulic oil tank through the second cooling and lubricating oil circuit and the first cooling and lubricating oil circuit to flow to the generator; and when the engine is stopped, control the electronic oil pump to pump the oil in the hydraulic oil tank through the first cooling and lubricating oil circuit to flow to the drive motor.

[0032] According to some embodiments of the present application, the vehicle controller is used for: when the engine is started, if the oil flow in the second cooling and lubricating oil circuit is lower than the required flow, controlling the electronic oil pump to pump the oil in the hydraulic oil tank through the first cooling and lubricating oil circuit to flow to the generator; when the engine is stopped, if the oil flow in the first cooling and lubricating oil circuit is lower than a predetermined value or the electronic oil pump fails, controlling the electronic oil pump to stop working, and controlling the engine to start to start the oil pump, pumping the oil in the hydraulic oil tank through the second cooling and lubricating oil circuit and the first cooling and lubricating oil circuit in sequence to flow to the drive motor.

[0033] According to some embodiments of the present application, the first cooling and lubricating oil circuit also includes: a radiator, which is respectively connected to the electronic oil pump and the first on-off valve; 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 liquid inlet and the liquid outlet of the radiator.

[0034] According to some embodiments of the present application, the first cooling and lubricating oil circuit also includes: a first branch, the first branch is connected between the radiator and the generator, and the first on-off valve is arranged in the first branch; a second branch, the second branch is connected between the radiator and the generator and is connected in parallel with the first branch, and the second branch is constructed with a first damping hole; a third branch, the third branch is connected between the radiator and the clutch, and the third branch is constructed with a second damping hole; a fourth branch, the fourth branch is connected between the radiator and the drive motor, and the third branch is constructed with a third damping hole; a fifth branch, one end of the fifth branch is connected between the first on-off valve and the generator, the other end of the fifth branch is connected to the transmission structure of the transmission, and the fifth branch is constructed with a fourth damping hole.

[0035] According to some embodiments of the present application, the electronic oil pump is mounted on an outer surface of a housing of the transmission.

[0036] According to some embodiments of the present application, the transmission hydraulic system also includes: a cooling and lubricating flow control oil circuit, which is connected to the first cooling and lubricating oil circuit and the hydraulic oil tank respectively, and the cooling and lubricating flow control oil circuit is used to control the flow rate of the oil in the first cooling and lubricating oil circuit returning to the hydraulic oil tank according to the temperature of the generator.

[0037] According to some embodiments of the present application, the cooling and lubricating flow control oil circuit includes: a second control valve, which is connected to the first cooling and lubricating oil circuit, and the second control valve changes its own on-off state according to the temperature of the generator; and a second on-off valve, which is respectively connected to the first cooling and lubricating oil circuit, the second control valve and the hydraulic oil tank; wherein, when the second control valve is connected, the second on-off valve is controlled to be connected to connect 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 be disconnected to disconnect the first cooling and lubricating oil circuit and the hydraulic oil tank.

[0038] According to a second aspect embodiment of the present application, a transmission is provided, comprising the transmission hydraulic system according to the first aspect embodiment of the present application.

[0039] The transmission according to the second aspect of the present application has the advantages of low energy consumption, high stability, etc. by utilizing the transmission hydraulic system according to the first aspect of the present application.

[0040] According to a third aspect embodiment of the present application, a powertrain is proposed, comprising the transmission according to the second aspect embodiment of the present application.

[0041] The powertrain according to the third aspect embodiment of the present application has the advantages of low energy consumption, high stability, etc. by utilizing the transmission according to the second aspect embodiment of the present application.

[0042] According to a fourth aspect embodiment of the present application, a vehicle is proposed, comprising the powertrain according to the second aspect embodiment of the present application.

[0043] The vehicle according to the fourth aspect embodiment of the present application has the advantages of low energy consumption, high stability, etc. by utilizing the powertrain according to the third aspect embodiment of the present application.

[0044] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0046] FIG1 is a schematic diagram of a transmission hydraulic system according to an embodiment of the present application.

[0047] FIG. 2 is another schematic diagram of a transmission hydraulic system according to an embodiment of the present application.

[0048] FIG3 is a schematic block diagram of a transmission according to an embodiment of the present application.

[0049] FIG4 is a schematic block diagram of a powertrain according to an embodiment of the present application.

[0050] FIG5 is a schematic block diagram of a vehicle according to an embodiment of the present application.

[0051] : Reference numerals: Transmission 1000, Powertrain 2000, Vehicle 3000, Transmission Hydraulic System 1, Generator 2, Generator Rotor 21, Generator Stator 22, Generator Bearing 23, Drive Motor 3, Drive Motor Rotor 31, Drive Motor Stator 32, Drive Motor Bearing 33, Clutch 4, Engine 5, Transmission Structure 6, Hydraulic Oil Tank 100, First Cooling and Lubricating Oil Circuit 200, First Branch 201, Second Branch 202, Third Branch 203, Fourth Branch 204, Fifth Branch 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, Vehicle Controller 330, Second cooling and lubricating oil circuit 400, pressure regulating valve 410, first one-way valve 420, sensor 430, return oil circuit 500, third one-way valve 510, clutch actuator oil circuit 600, pressure sensor 610, actuator proportional valve 620, clutch actuator cylinder 630, accumulator 640, cooling and lubricating flow control oil circuit 700, second control valve 710, second on-off valve 720, coarse filter 800. DETAILED DESCRIPTION

[0052] The following describes in detail embodiments of the present application, and the embodiments described with reference to the accompanying drawings are exemplary.

[0053] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0054] In the description of this application, “plurality” means two or more.

[0055] The transmission hydraulic system 1 according to an embodiment of the present application will be described below with reference to the accompanying drawings.

[0056] As shown in FIG. 1 and FIG. 2 , the transmission hydraulic system 1 proposed according to an embodiment of the present application includes a hydraulic oil tank 100 and a first cooling and lubricating oil circuit 200 .

[0057] The first cooling and lubricating oil circuit 200 is adapted to connect the hydraulic oil tank 100 and the generator 2. The first cooling and lubricating oil circuit 200 includes a first on-off valve 210, which selectively controls the flow of oil from the first cooling and lubricating oil circuit 200 to the generator 2. In other words, the first on-off valve 210 controls whether the oil in the first cooling and lubricating oil circuit 200 can flow through the first on-off valve 210 to the generator 2 by opening and closing the valve.

[0058] It is understood that when the generator 2 is in operation, the first on-off valve 210 can be in an on state, and the first on-off valve 210 controls the oil in the first cooling and lubricating oil circuit 200 to flow to the generator 2, thereby allowing the oil to cool the generator 2. When the vehicle is in pure electric mode, the generator 2 generates low heat or no heat. At this time, the first on-off valve 210 can be in an off state, and the first on-off valve 210 controls the oil in the first cooling and lubricating oil circuit 200 not to flow to the generator 2. In this way, the oil in the first cooling and lubricating oil circuit 200 can flow to other structures, such as the drive motor 3, thereby avoiding energy waste and rationally utilizing the oil to cool the generator 2.

[0059] According to some specific embodiments of the present application, as shown in Figures 1 and 2 , the first on-off valve 210 is configured as a one-way on-off valve that only allows oil to flow toward the generator 2. This prevents the oil in the first cooling and lubricating oil 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 operating, thereby ensuring effective heat dissipation for the generator 2.

[0060] According to other specific embodiments of the present application, the first on-off valve 210 is an electronic valve that is used to open and close according to the start / stop signal of the generator 2 to selectively control the flow of oil in the first cooling and lubricating oil circuit 200 to the generator 2. The electronic valve can be connected to a corresponding controller. When receiving the start signal of the generator 2, the electronic valve controls the flow of oil in the first cooling and lubricating oil circuit 200 to the generator 2. When receiving the stop signal of the generator 2, the electronic valve controls the flow of oil in the first cooling and lubricating oil circuit 200 to the generator 2. In this way, the oil flow in the first cooling and lubricating oil circuit 200 can be precisely controlled, effectively avoiding power waste and ensuring effective heat dissipation for the generator 2.

[0061] According to further specific embodiments of the present application, as shown in FIG2 , the first on-off valve 210 is a hydraulic valve; the transmission hydraulic system 1 further includes a control oil circuit 300 connecting the hydraulic oil tank 100 and the first cooling and lubricating oil circuit 200. The control oil circuit 300 includes an oil pump 310 , which is configured to start and stop synchronously with the engine 5 , pumping oil to control the opening and closing of the first on-off valve 210 , thereby selectively controlling the flow of oil in the first cooling and lubricating oil circuit 200 to the generator 2 .

[0062] For example, the first cooling and lubricating oil circuit 200 can provide low-pressure, high-flow oil, primarily for lubricating and cooling the drive motor 3, generator 2, clutch 4, and transmission structure 6. The oil pump 310 provides high-pressure, low-flow oil to the control oil circuit 300, which is used to control the oil pressure in the transmission hydraulic system 1. This prevents low oil pressure during startup, replenishes pressure or flow for clutch 4 shifting, and prevents excessive system pressure during normal operation, potentially damaging clutch 4 components, thereby achieving pressure reduction and stabilization.

[0063] It should be noted that the synchronous start and stop of the oil pump 310 and the engine 5 does not mean that the start time of the oil pump 310 and the start time of the engine 5 completely coincide. The start time of the oil pump 310 and the start time of the engine 5 may be staggered, but when the engine 5 starts, the oil pump 310 starts accordingly, and when the engine 5 stops, the oil pump 310 stops accordingly.

[0064] According to the transmission hydraulic system 1 of an embodiment of the present application, when the engine 5 starts, the oil pump 310 starts working and starts pumping oil from the hydraulic oil tank 100. The oil pump 310 controls the oil in the first cooling lubricating oil circuit 200 to flow to the generator 2 by controlling the oil circuit 300. At this time, the oil in the first cooling lubricating 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 lubricating oil circuit 200 does not flow to the generator 2.

[0065] In the transmission hydraulic system 1 of the embodiment of the present application, the start and stop of the oil pump 310 is not determined by an electrical signal, and the reliability of the 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 will not be affected by the external voltage strength 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.

[0066] In this way, the transmission hydraulic system 1 according to the embodiment of the present application has the advantages of low energy consumption and high stability.

[0067] Furthermore, as shown in FIG2 , the control oil circuit 300 further 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 when the oil pump 310 is started to control the flow to the first on-off valve 210 .

[0068] 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 a vehicle control unit (VCU) 330. The VCU 330 can adjust the pressure at the working oil port of the first control valve 320 according to the start and stop of the engine 5, thereby controlling the flow rate to the first on-off valve 210. The on and off of the first on-off valve 210 is also controlled by the first control valve 320, thereby better controlling whether oil is supplied to the generator 2.

[0069] According to some specific embodiments of the present application, as shown in FIG2 , the transmission hydraulic system 1 further includes a second cooling and lubricating oil circuit 400. The second cooling and lubricating oil circuit 400 is connected to the oil pump 310 and the first cooling and lubricating oil circuit 200, respectively. When the first on-off valve 210 is turned on, the oil pump 310 can pump oil sequentially through the second cooling and lubricating oil circuit 400 and the first cooling and lubricating oil circuit 200 to the generator 2. In other words, when the first control valve 320 controls the first on-off valve 210 to be turned on, the oil pumped by the oil pump 310 can flow through the second cooling and lubricating oil circuit 400 and the first cooling and lubricating oil circuit 200 to the generator 2. In this way, the control oil circuit 300 can control the cooling effect of the generator 2.

[0070] In this way, when the control oil circuit 300 has sufficient flow and surplus oil, the control oil circuit 300 transfers the surplus oil to the first cooling and lubricating oil circuit 200 through the second cooling and lubricating oil circuit 400, thereby improving the energy efficiency of the transmission hydraulic system 1. In the event of a failure in the electronic oil pump 230 of the first cooling and lubricating oil circuit 200, the oil in the control oil circuit 300 can also flow into the first cooling and lubricating oil circuit 200 through the second cooling and lubricating oil circuit 400, thereby enhancing system redundancy, ensuring the cooling effect and reliability of the transmission hydraulic system 1, and reducing the power load of the first cooling and lubricating oil circuit 200.

[0071] According to some specific embodiments of the present application, as shown in Figure 2, the second cooling and lubricating oil circuit 400 also includes a first one-way valve 420, which is connected between the oil pump 310 and the first cooling and lubricating oil circuit 200. The first one-way valve 420 is configured to only allow oil to flow to the first cooling and lubricating oil circuit 200.

[0072] In this way, by setting the first one-way valve 420, the oil in the first cooling and lubricating oil circuit 200 can be prevented from flowing to the second cooling and lubricating oil circuit 400 and the control oil circuit 300, thereby ensuring sufficient flow of oil in the first cooling and lubricating oil circuit 200 and reducing the risk of oil leakage in the first cooling and lubricating oil circuit 200.

[0073] The first control valve 320 is a pilot proportional valve, and is connected to the second cooling and lubricating oil circuit 400 to adjust the flow of oil from the second cooling and lubricating oil circuit 400 to the first cooling and lubricating oil circuit 200 .

[0074] By setting the first control valve 320 as a pilot proportional valve, continuous linear adjustment can be achieved to control the flow required for the lubrication and cooling of the generator 2 by the transmission hydraulic system 1 and the system pressure required for the clutch 4, so that the transmission hydraulic system 1 has small pressure fluctuations, compact structure, concentrated functions, and effectively reduces costs.

[0075] According to some specific embodiments of the present application, as shown in FIG2 , the second cooling and lubricating 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 to adjust the flow rate of oil from the second cooling and lubricating oil circuit 400 to the first cooling and lubricating oil circuit 200.

[0076] In this way, the flow rate of the 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 flow rate and pressure of the oil in the first cooling and lubricating oil circuit 200 .

[0077] According to some specific embodiments of the present application, as shown in Figure 2, the transmission hydraulic system 1 also includes a return oil circuit 500, which is respectively connected to the pressure regulating valve 410 and the hydraulic oil tank 100. 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 to adjust the flow rate of oil from the return oil circuit 500 to the hydraulic oil tank 100.

[0078] By setting up the return oil circuit 500, the excess oil in the second cooling and lubricating oil circuit 400 and the control oil circuit 300 can be returned to the hydraulic oil tank 100 through the pressure regulating valve 410, and the oil outlet of the oil pump 310 is connected to a sensor 430 for detecting the pressure of the oil outlet of the oil pump 310, and the sensor 430 can be connected to the transmission controller, and the transmission controller is connected to the vehicle controller 330. The vehicle controller 330 can adjust the valve core position of the pressure regulating valve 410 through the first control valve 320 according to the pressure of the oil outlet of the oil pump 310 to adjust the flow rate of the oil from the return oil circuit 500 to the hydraulic oil tank 100, so as to adjust the pressure of the oil outlet of the oil pump 310 to achieve normal operation of the oil pump 310.

[0079] For example, the liquid cooling tank 100 is connected to a coarse filter 800, which coarsely filters the oil flowing from the liquid cooling tank 100 to the oil pump 310. The oil at the outlet of the return oil circuit 500 is located downstream of the coarse filter 800 to avoid repeated filtration of the oil by the coarse filter 800, thereby reducing the oil stroke.

[0080] According to some specific embodiments of the present application, as shown in FIG2 , the first control valve 320 controls the flow of oil from the return oil circuit 500 to the hydraulic oil tank 100 through the pressure regulating valve 410 , and the flow rate is positively correlated with the rotational speed of the engine 5 .

[0081] When the speed of the engine 5 increases, the pump flow rate of the oil pump 310 also increases. However, the flow rate required by the transmission hydraulic system 1 may be lower than the pump flow rate of the oil pump 310. Therefore, it is necessary to control the flow rate of the oil flowing from the return oil line 500 to the hydraulic oil tank 100 to increase accordingly to leak the excess oil pumped by the oil pump 310 and prevent the transmission hydraulic system 1 from being damaged due to excessive oil pressure.

[0082] When the speed of the engine 5 decreases, the pump flow of the oil pump 310 also decreases. Therefore, it is necessary to control the flow of oil from the return oil circuit 500 to the hydraulic oil tank 100 to decrease accordingly, so that the oil pumped out by the oil pump 310 can be distributed more to the clutch 4, generator 2, drive motor 3, transmission structure 6 and other structures to meet the needs of the transmission hydraulic system 1.

[0083] According to some specific embodiments of the present application, as shown in FIG2 , the first control valve 320 controls the flow of oil from the return oil line 500 to the hydraulic oil tank 100 through the pressure regulating valve 410 , and the flow rate is negatively correlated with the temperature of the generator 2 .

[0084] When the temperature of the generator 2 increases, the flow rate of the oil from the control return oil circuit 500 to the hydraulic oil tank 100 is reduced, so that more oil from the control return oil circuit 500 flows to the generator 2, thereby improving the cooling effect on the generator 2; when the temperature of the generator 2 decreases, the flow rate of the oil from the control return oil circuit 500 to the hydraulic oil tank 100 is increased, so that less oil from the control return oil circuit 500 flows to the generator 2, thereby improving the working efficiency of the transmission hydraulic system 1.

[0085] Those skilled in the art will understand that controlling the flow rate of the oil from the return oil circuit 500 to the hydraulic oil tank 100 is negatively correlated with the temperature of the clutch 4 of the transmission, or controlling the flow rate of the oil from the return oil circuit 500 to the hydraulic oil tank 100 is negatively correlated with the temperature of the drive motor 3 of the transmission, or controlling the flow rate of the oil from the return oil circuit 500 to the hydraulic oil tank 100 is negatively correlated with the temperature of the transmission structure 6 of the transmission, or controlling the flow rate of the oil from the return oil circuit 500 to the hydraulic oil tank 100 is negatively correlated with the temperature of the clutch 4 of the transmission, the temperature of the drive motor 3, and the temperature of the transmission structure 6.

[0086] According to some specific embodiments of the present application, as shown in Figure 2, the transmission hydraulic system 1 also includes a clutch actuator oil circuit 600, which is respectively connected to the pressure regulating valve 410 and the clutch 4. 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 to adjust the flow rate of oil from the second cooling and lubricating oil circuit 400 to the clutch actuator oil circuit 600.

[0087] 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 and lubricating 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 separation and engagement of the clutch 4, thereby realizing the switching of the drive mode.

[0088] According to some specific embodiments of the present application, as shown in FIG2 , 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. The actuation proportional valve 620 adjusts the flow rate of oil from the clutch actuation oil circuit 600 to the clutch 4 based on the pressure feedback from the pressure sensor 610.

[0089] For example, the actuator proportional valve 620 can be a two-position, three-way, direct-drive proportional solenoid valve. The inlet of the actuator proportional valve 620 is connected to the oil outlet of the oil pump 310, one outlet of the actuator proportional valve 620 is connected to the hydraulic oil tank 100, and the other outlet of the actuator proportional valve 620 is connected to the clutch 4. In addition, the pressure sensor 610 can transmit the detected pressure of the clutch actuator oil circuit 600 to the transmission controller, which then adjusts the opening of the outlet of the actuator proportional valve 620 based on the pressure of the clutch actuator oil circuit 600.

[0090] Thus, by associating the opening of the outlet of the actuator proportional valve 620 connected to the clutch 4 with the pressure of the clutch actuator oil circuit 600, oil of stable pressure can be provided to the clutch actuator oil circuit 600, ensuring the positional reliability of the clutch 4 when it is disengaged and engaged, and reducing the probability of damage to the clutch 4 due to excessive pressure. In addition, by connecting one outlet of the actuator proportional valve 620 to the hydraulic oil tank 100, the oil in the actuator proportional valve 620 can be returned to the hydraulic oil tank 100 when the actuator proportional valve 620 is not operating, thereby improving oil utilization and reducing the pressure in the actuator proportional valve 620 to facilitate the next use of the actuator proportional valve 620.

[0091] The embodiment of the present application uses an actuator proportional valve 620 to achieve real-time control and regulation of the clutch 4 control pressure and flow, which has the advantages of easy control, simple structure, small hysteresis, fast response, high efficiency, and good reliability.

[0092] According to some specific embodiments of the present application, as shown in FIG. 2 , the clutch actuating oil circuit 600 further includes a clutch actuating oil cylinder 630 and an accumulator 640 .

[0093] The clutch actuator cylinder 630 is connected to the actuator proportional valve 620 and the clutch 4 respectively, and is used to control the separation and engagement of the clutch 4. The accumulator 640 is connected between the actuator proportional valve 620 and the clutch actuator cylinder 630, and is used to absorb the pressure impact of the clutch actuator oil circuit 600.

[0094] For example, clutch actuating cylinder 630 is connected to the aforementioned other outlet of actuator proportional valve 620. Clutch actuating cylinder 630 controls the disengagement and engagement of clutch 4 through the movement of its own piston. The flow and pressure within clutch actuating cylinder 630 can be adjusted by adjusting the opening of the outlet of actuator proportional valve 620 connecting to clutch actuating cylinder 630, thereby controlling the position of the piston of clutch actuating cylinder 630. Accumulator 640 is connected to the aforementioned other outlet of actuator proportional valve 620 to compensate for the pressure and flow in clutch actuating oil circuit 600 during gear shifting, preventing oil shock that could cause malfunction of clutch actuating cylinder 630 and thereby stabilizing the pressure of clutch 4.

[0095] According to some specific embodiments of the present application, the first control valve 320 is suitable for connecting to the vehicle controller 330, and the vehicle controller 330 is used to: if the hydraulic pressure of the clutch execution oil circuit 600 is lower than the required hydraulic pressure, control the opening of the first control valve 320 to increase to a predetermined opening, thereby increasing the flow of the pressure regulating valve 410 to the clutch execution oil circuit 600 to a first predetermined value, and reducing the flow of the first control valve 320 to the first on-off valve 210 to a second predetermined value.

[0096] That is, if the hydraulic pressure in the clutch actuating oil circuit 600 falls below the required hydraulic pressure, the flow rate supplied to the clutch actuating oil circuit 600 needs to be adjusted promptly. The first control valve 320 increases its opening to a predetermined value, which increases the flow rate from the pressure regulating valve 410 to the clutch actuating oil circuit 600. When the flow rate reaches a first predetermined value, the hydraulic pressure in the clutch actuating oil circuit 600 gradually reaches the required hydraulic pressure. Correspondingly, the flow rate from the first control valve 320 to the first on-off valve 210 decreases, and the opening of the first on-off valve 210 decreases accordingly. This distribution method ensures the clutch operation of the clutch actuating oil circuit 600 and maintains the driving stability of the vehicle. When the hydraulic pressure of the clutch execution oil circuit 600 is higher than the required hydraulic pressure, the opening of the first control valve 320 can be reduced, and the flow of the pressure regulating valve 410 to the clutch execution oil circuit 600 can be reduced accordingly. In addition, a part of the oil can be controlled to flow to the generator 2 through the second cooling and lubricating oil circuit 400 and the first cooling and lubricating oil circuit 200. The flow of the first control valve 320 to the first on-off valve 210 will increase, thereby increasing the flow to the generator 2 and ensuring the cooling effect of the generator 2.

[0097] According to some specific embodiments of the present application, as shown in FIG2 , the first cooling and lubricating oil circuit 200 includes a second one-way valve 220. The second one-way valve 220 is located between the second cooling and lubricating oil circuit 400 and the hydraulic oil tank 100 on the first cooling and lubricating oil circuit 200 and is used to prevent the oil in the second cooling and lubricating oil circuit 400 from flowing back into the hydraulic oil tank 100 through the first cooling and lubricating oil circuit 200. The provision of the second one-way valve 220 can prevent the oil in the second cooling and lubricating oil circuit 400 from leaking through the electronic oil pump 230 or flowing back into the hydraulic oil tank 100.

[0098] According to some specific embodiments of the present application, as shown in Figure 2, the return oil circuit 500 also includes a third one-way valve 510, which is respectively connected to the pressure regulating valve 410 and the hydraulic oil tank 100, and the third one-way valve 510 is configured to only allow oil to flow from the pressure regulating valve 410 to the hydraulic oil tank 100.

[0099] In this way, the oil in the hydraulic oil tank 100 can be prevented from directly flowing 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 .

[0100] According to some specific embodiments of the present application, as shown in FIG2 , the first control valve 320 controls the flow of oil from the return oil circuit 500 to the hydraulic oil tank 100 through the pressure regulating valve 410 , and the flow is positively correlated with the pressure of the clutch execution oil circuit 600 .

[0101] For example, the vehicle controller 330 can obtain the pressure of the clutch actuator oil circuit 600 through the transmission controller. The vehicle controller 330 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 flowing from the control return oil circuit 500 to the hydraulic oil tank 100, and changing the flow rate of the oil flowing from the control return oil circuit 500 to the clutch actuator oil circuit 600, thereby achieving the effect of stabilizing the pressure of the clutch actuator oil circuit 600.

[0102] For example, when the pressure of the clutch actuator oil circuit 600 is relatively high, the flow rate of the oil from the control return oil circuit 500 to the hydraulic oil tank 100 can be increased to reduce the flow rate of the oil from the control return oil circuit 500 to the clutch actuator oil circuit 600, thereby reducing the pressure of the clutch actuator oil circuit 600; when the pressure of the clutch actuator oil circuit 600 is relatively low, the flow rate of the oil from the control return oil circuit 500 to the hydraulic oil tank 100 can be reduced to increase the flow rate of the oil from the control return oil circuit 500 to the clutch actuator oil circuit 600, thereby increasing the pressure of the clutch actuator oil circuit 600.

[0103] Oil pump 310 is a mechanical oil pump adapted for transmission connection with engine 5. When engine 5 starts, mechanical oil pump 310 begins operating, pumping oil from hydraulic oil tank 100. When engine 5 stops, mechanical oil pump 310 ceases pumping oil. This intermittent operation of mechanical oil pump 310, synchronized with engine 5 start and stop, reduces system energy consumption, improves the efficiency of transmission hydraulic system 1, and enhances energy efficiency in pure electric mode.

[0104] According to some specific embodiments of the present application, as shown in FIG2 , the first cooling and lubricating oil circuit 200 is further adapted to connect the hydraulic oil tank 100 and the drive motor 3. The first cooling and lubricating oil circuit 200 includes an electronic oil pump 230. The electronic oil pump 230 is connected to the hydraulic oil tank 100 and is used to pump oil from the hydraulic oil tank 100 to the generator 2 and the drive motor 3 through the first cooling and lubricating oil circuit 200. The electronic oil pump 230 can be started when the engine 5 stops working. The electronic oil pump 230 can pump oil to the generator 2 and the drive motor 3 through the first cooling and lubricating oil circuit 200, thereby cooling the generator 2 and the drive motor 3 accordingly and ensuring the cooling effect of the generator 2 and the drive motor 3.

[0105] Furthermore, the electronic oil pump 230 is suitable for connecting to the vehicle controller 330, and the vehicle controller 330 is used for: in series mode, that is, non-pure electric mode (when the engine 5 is in the starting state), if the oil flow in the second cooling and lubricating oil circuit 400 is lower than the required flow, the electronic oil pump 230 is controlled to pump the oil in the hydraulic oil tank 100 through the first cooling and lubricating oil circuit 200 to the generator 2; in pure electric or parallel mode (when the engine is in the stopped state), if the oil flow in the first cooling and lubricating oil circuit 200 is lower than the predetermined value or the electronic oil pump 230 fails, the electronic oil pump 230 is controlled to stop working, and the engine 5 is controlled to start to start the oil pump 310, pumping the oil in the hydraulic oil tank 100 through the second cooling and lubricating oil circuit 400 and the first cooling and lubricating oil circuit 200 in turn to flow to the drive motor 3.

[0106] 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 oil to the first cooling and lubricating oil circuit 200. The electronic oil pump 230 can operate continuously. In series mode, the engine 5, the generator 2, and the drive motor 3 all begin operation. If the oil flow in the second cooling and lubricating oil circuit 400 falls below the required flow rate, the required flow rate of the generator 2 cannot be met, and oil replenishment is required. At this time, the electronic oil pump 230 begins to operate, and the oil pumped by the electronic oil pump 230 flows through the first cooling and lubricating oil circuit 200 to the generator 2, meeting the cooling requirements of the generator 2.

[0107] In pure electric or parallel mode, when the cooling and lubrication flow is insufficient or the electronic oil pump 230 fails 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.

[0108] In this application, the lubrication and cooling of the generator 2 is controlled by the first control valve 320, realizing a logical association between the cooling control and the operating state of the engine 5. When the engine 5 is stopped, the generator 2 has no cooling, reducing the waste of cooling flow. When the engine 5 is working, the generator 2 is lubricated and cooled, realizing the on-demand distribution of the cooling flow of the generator 2, and improving the working efficiency of the hydraulic system.

[0109] In addition, in this application, the cooling and lubrication of the electric motor 2 are controlled by two distribution ratios. In pure electric mode, the oil pump 310 supplies oil, and a large distribution ratio is used to increase the cooling effect of the drive motor 3 and provide EV mode working condition coverage. In non-pure electric mode, the oil pump 310 and the electronic oil pump 230 supply oil together, and a small distribution ratio is used to balance the lubrication and cooling requirements of each component, thereby effectively reducing the energy consumption of the hydraulic system.

[0110] According to some specific embodiments of the present application, as shown in Figure 2, the first cooling lubricating oil circuit 200 also includes a radiator 240 and a bypass valve 250. The radiator 240 is respectively connected to the electronic oil pump 230 and the first on-off valve 210. The bypass valve 250 is connected in parallel with the radiator 240. The bypass valve 250 changes its own on-off state according to the pressure difference between the liquid inlet and the liquid outlet of the radiator 240.

[0111] Radiator 240 is used to cool the oil in first cooling and lubricating oil circuit 200, allowing the oil in first cooling and lubricating oil circuit 200 to cool generator 2. When the pressure difference between the inlet and outlet of radiator 240 is too large, bypass valve 250 opens, effectively reducing damage to radiator 240 and preventing valve misalignment. Bypass valve 250 can be a one-way bypass valve 250, allowing oil to flow only from the electronic oil pump 230 to the generator 2.

[0112] According to some specific embodiments of the present application, as shown in FIG2 , the first cooling lubricating oil circuit 200 further 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 configured with a first damping orifice 260.

[0113] In this way, when the engine 5 starts, the oil in the first cooling lubricating oil 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 lubricating oil circuit 200 can only dissipate heat for the generator 2 through the second branch 202, thereby reducing energy consumption and improving work efficiency.

[0114] According to some specific embodiments of the present application, as shown in FIG. 2 , the first cooling and lubricating oil circuit 200 further includes a third branch 203 , a fourth branch 204 , and a fifth branch 205 .

[0115] The third branch 203 is connected between the radiator 240 and the clutch 4 and is configured with a second damping orifice 270. The fourth branch 204 is connected between the radiator 240 and the drive motor 3 and is configured with a third damping orifice 280. One end of the fifth branch 205 is connected between the first on-off valve 210 and the generator 2, and the other end of the fifth branch 205 is connected to the transmission structure 6 of the transmission, where the transmission structure 6 may include at least one of a bearing, a gear, or a drive shaft. The fifth branch 205 is configured with a fourth damping orifice 290. In this way, the first cooling and lubricating oil circuit 200 can cool the drive motor 3, the clutch 4, and the transmission structure 6 of the transmission.

[0116] For example, the generator 2 may include a generator rotor 21, a generator stator 22 and a generator bearing 23. The second branch 202 dissipates heat for the generator rotor 21, the generator stator 22 and the generator bearing 23 respectively. The second branch 202 is provided with a plurality of first damping holes 260 corresponding to the generator rotor 21, the generator stator 22 and the generator bearing 23.

[0117] The drive motor 3 includes a drive motor rotor 31, a drive motor stator 32 and a drive motor bearing 33. The fourth branch 204 dissipates heat for the drive motor rotor 31, the drive motor stator 32 and the drive motor bearing 33 respectively. The fourth branch 204 is provided with a plurality of third damping holes 280 corresponding to the drive motor rotor 31, the drive motor stator 32 and the drive motor bearing 33.

[0118] According to some specific embodiments of the present application, as shown in FIG2 , the first cooling and lubricating oil circuit 200 further includes a filter 241 connected to the liquid 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 being clogged when passing through the first damping orifice 260, the second damping orifice 270, the third damping orifice 280, and the fourth damping orifice 290.

[0119] For example, the filter 241 and the radiator 240 may be connected in series, and then the filter 241 and the radiator 240 may be connected in series and then connected in parallel to the bypass valve 250 .

[0120] According to some specific embodiments of the present application, as shown in Figure 2, 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 reduces the total space occupied by the electronic oil pump 230 and the transmission housing, shortens the oil path between the electronic oil pump 230 and the transmission components within the transmission, reduces pressure loss along the way, and reduces costs.

[0121] According to some specific embodiments of the present application, as shown in FIG2 , the transmission hydraulic system 1 further includes a cooling and lubricating flow control oil circuit 700 , which is connected to the first cooling and lubricating oil circuit 200 and the hydraulic oil tank 100 , respectively. The cooling and lubricating flow control oil circuit 700 controls the flow rate of the oil in the first cooling and lubricating oil circuit 200 back to the hydraulic oil tank 100 based on the temperature of the generator 2. The medium-thick lines indicate the flow of oil in the cooling and lubricating flow control oil circuit 700 and the first cooling and lubricating oil circuit 200 .

[0122] The cooling and lubricating flow control oil circuit 700 can adjust the flow in the first cooling and lubricating oil circuit 200 according to one, several or all of the temperatures of the drive motor 3, the generator 2, the clutch 4 and the transmission structure 6 in the transmission obtained by the transmission controller. For example, when the vehicle is started from cold or the ambient temperature is low, when the drive motor 3, the generator 2, the clutch 4 and the transmission structure 6 in the transmission do not need to be cooled, the flow of the oil in the first cooling and lubricating oil circuit 200 can be reduced by adjusting the cooling and lubricating flow control oil circuit 700, thereby avoiding problems such as slow increase in oil temperature, effectively improving the efficiency of the transmission and achieving energy saving and consumption reduction.

[0123] According to some specific embodiments of the present application, as shown in FIG. 2 , the cooling and lubrication flow control oil circuit 700 includes a second control valve 710 and a second on-off valve 720 .

[0124] The second control valve 710 is connected to the first cooling and lubricating 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 lubricating oil circuit 200, the second control valve 710, and the hydraulic oil tank 100. When the second control valve 710 is connected, the second on / off valve 720 is controlled to connect, thereby connecting the first cooling and lubricating oil circuit 200 and the hydraulic oil tank 100. When the second control valve 710 is disconnected, the second on / off valve 720 is controlled to disconnect, thereby disconnecting the first cooling and lubricating oil circuit 200 from the hydraulic oil tank 100.

[0125] 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 cooling tank. When the second control valve 710 stops working, the oil in the second control valve 710 can flow back to the liquid cooling tank, reducing oil damage and preventing the second control valve 710 from operating again. The working oil port of the second control valve 710 is connected to the pilot oil 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 cooling tank.

[0126] 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 of the transmission. For example, when the temperature of the generator 2 is low, the generator 2 does not need to be cooled. 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 lubricating oil circuit 200 can be returned to the liquid cooling oil tank through the second on-off valve 720, reducing the amount of oil in the first cooling lubricating oil circuit 200 and avoiding the temperature of the oil from rising too slowly; when the temperature of the generator 2 is high, the generator 2 needs to be cooled. 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 lubricating oil circuit 200 can be returned to the liquid cooling oil tank through the second on-off valve 720, so that the oil in the first cooling lubricating oil circuit 200 can better cool the generator 2.

[0127] It will be understood by those skilled in the art that the second control valve 710 may also control the opening of the second on-off valve 720 according to the temperature of the transmission drive motor 3, or the second control valve 710 may also control the opening of the second on-off valve 720 according to the temperature of the transmission clutch 4, or the second control valve 710 may control the opening of the second on-off valve 720 according to the temperature of the transmission structure 6 in the transmission, or the second control valve 710 may control the opening of the second on-off valve 720 according to the temperature combination of several of the transmission generator 2, drive motor 3, clutch 4 and transmission structure 6, or the second control valve 710 may control the opening of the second on-off valve 720 according to the temperature combination of all of the transmission generator 2, drive motor 3, clutch 4 and transmission structure 6.

[0128] In the embodiment of the present application, a second control valve 710 controls the total flow of the first cooling lubricating oil circuit 200 to meet the lubrication requirements of the drive motor 3, generator 2, clutch 4 and transmission structure 6 under low temperature conditions, while overflowing excess flow to reduce losses along the way and effectively improve the energy efficiency of the transmission hydraulic system 1.

[0129] In some embodiments of the present application, the bypass valve 250, the first control valve 320, the pressure regulating valve 410, the first one-way valve 420, the third one-way valve 510, the executive proportional valve 620, the second control valve 710, and the second on-off valve 720 can be integrated into one, with a small number of parts, extremely high functional integration, low cost, simple assembly, greatly reduced leakage of the transmission hydraulic system 1, simple and compact structure, light weight, low processing difficulty, and extremely high transmission efficiency.

[0130] The transmission 1000 according to an embodiment of the present application will be described below with reference to FIG3 . The transmission 1000 includes a transmission hydraulic system 1 according to an embodiment of the first aspect of the present application.

[0131] The transmission 1000 according to the embodiment of the present application has the advantages of low energy consumption and high stability by utilizing the transmission hydraulic system 1 according to the embodiment of the present application.

[0132] The powertrain 2000 according to an embodiment of the present application will be described below with reference to FIG. 4 . The powertrain 2000 includes the transmission 1000 according to the above-mentioned embodiment of the present application.

[0133] The powertrain 2000 according to the embodiment of the present application has the advantages of low energy consumption and high stability by utilizing the transmission 1000 according to the above embodiment of the present application.

[0134] A vehicle 3000 according to an embodiment of the present application will be described below with reference to FIG5 . The vehicle 3000 includes the powertrain 2000 according to the above embodiment of the present application.

[0135] The vehicle 3000 according to the embodiment of the present application has the advantages of low energy consumption and high stability by utilizing the powertrain 2000 according to the above embodiment of the present application.

[0136] Other structures and operations of the transmission hydraulic system 1 , the transmission 1000 , the powertrain 2000 and the vehicle 3000 according to the embodiment of the present application are well known to those skilled in the art and will not be described in detail here.

[0137] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0138] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A transmission hydraulic system (1), characterized in that: include: Hydraulic oil tank (100); and A first cooling lubricating oil circuit (200), wherein the first cooling lubricating oil circuit (200) is suitable for connecting the hydraulic oil tank (100) and the generator (2), and the first cooling lubricating oil circuit (200) comprises a first on-off valve (210), and the first on-off valve (210) is used to selectively control whether the oil in the first cooling lubricating oil circuit (200) flows to the generator (2).

2. The transmission hydraulic system (1) according to claim 1, characterized in that: The first on-off valve (210) is configured as a one-way on-off valve that only allows oil to flow in the direction of the generator (2).

3. The transmission hydraulic system (1) according to claim 1 or 2, characterized in that: The first on-off valve (210) is an electronic valve, which is used to be switched on and off according to a start / stop signal of the generator (2) so as to selectively control whether the oil in the first cooling lubricating oil circuit (200) flows to the generator (2).

4. The transmission hydraulic system (1) according to claim 1 or 2, characterized in that: The first on-off valve (210) is a hydraulic valve; the transmission hydraulic system (1) further comprises: A control oil circuit (300), wherein the control oil circuit (300) is connected to the hydraulic oil tank (100) and the first cooling lubricating oil circuit (200), and the control oil circuit (300) comprises an oil pump (310), wherein the oil pump (310) is used to start and stop synchronously with the engine (5) to pump oil to control the on and off of the first on-off valve (210), thereby selectively controlling whether the oil in the first cooling lubricating oil circuit (200) flows to the generator (2).

5. The transmission hydraulic system (1) according to claim 4, characterized in that: The control oil circuit (300) further comprises a first control valve (320), the first control valve (320) being connected to the oil pump (310) and the first on-off valve (210) respectively, the first control valve (320) being configured to control the oil flow to the first on-off valve (210) by using the oil pumped when the oil pump (310) is started. Wherein, the first control valve (320) is a pilot proportional valve.

6. The transmission hydraulic system (1) according to claim 4, characterized in that: Also includes: a second cooling lubricating oil circuit (400), wherein the second cooling lubricating oil circuit (400) is connected to the oil pump (310) and the first cooling lubricating oil circuit (200) respectively, The oil pump (310) is configured to pump oil to flow to the generator (2) in sequence through the second cooling lubricating oil circuit (400) and the first cooling lubricating oil circuit (200) when the first on-off valve (210) is turned on.

7. The transmission hydraulic system (1) according to claim 6, characterized in that: The second cooling lubricating oil circuit (400) further comprises: A first one-way valve (420), wherein the first one-way valve (420) is connected between the oil pump (310) and the first cooling lubricating oil circuit (200), and the first one-way valve (420) is configured to only allow oil to flow from the second cooling lubricating oil circuit (400) to the first cooling lubricating oil circuit (200).

8. The transmission hydraulic system (1) according to claim 6 or 7, characterized in that: The control oil circuit (300) further comprises a first control valve (320), wherein the first control valve (320) is connected to the second cooling lubricating oil circuit (400) to adjust the flow rate of oil from the second cooling lubricating oil circuit (400) to the first cooling lubricating oil circuit (200); wherein the first control valve (320) is a pilot proportional valve.

9. The transmission hydraulic system (1) according to claim 8, characterized in that: The second cooling lubricating oil circuit (400) further includes: A pressure regulating valve (410), wherein the pressure regulating valve (410) is connected to the first control valve (320), and 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 to adjust the flow rate of oil flowing from the second cooling lubricating oil circuit (400) to the first cooling lubricating oil circuit (200).

10. The transmission hydraulic system (1) according to claim 9, characterized in that: Also includes: An oil return circuit (500), wherein the oil return circuit (500) is connected to the pressure regulating valve (410) and the hydraulic oil tank (100) respectively, and 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 to adjust the oil return circuit (500). The flow rate of oil flowing to the hydraulic oil tank (100).

11. The transmission hydraulic system (1) according to claim 10, characterized in that: 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), and the flow rate is positively correlated with the rotation speed of the engine (5). The engine (5) is suitable for connecting to the generator (2) and driving the generator (2) to generate electricity.

12. The transmission hydraulic system (1) according to claim 10 or 11, characterized in that: The first control valve (320) controls the flow rate of oil flowing from the oil return line (500) to the hydraulic oil tank (100) through the pressure regulating valve (410), and the flow rate is negatively correlated with the temperature of the generator (2).

13. The transmission hydraulic system (1) according to any one of claims 9 to 12, characterized in that: Also includes: A clutch actuating oil circuit (600) 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 to adjust the flow rate of oil flowing from the second cooling and lubricating oil circuit (400) to the clutch actuating oil circuit (600).

14. The transmission hydraulic system (1) according to claim 13, characterized in that: The clutch actuating oil circuit (600) comprises: a pressure sensor (610), the pressure sensor (610) being used to detect the pressure of the clutch actuating oil circuit (600); and An actuating proportional valve (620) is connected to the pressure sensor (610), and the actuating proportional valve (620) adjusts the flow rate of oil flowing from the clutch actuating oil circuit (600) to the clutch (4) according to the pressure feedback from the pressure sensor (610).

15. The transmission hydraulic system (1) according to claim 14, characterized in that: The clutch actuating oil circuit (600) further comprises: A clutch actuating cylinder (630), the clutch actuating cylinder (630) being connected to the actuating proportional valve (620) and the clutch (4) respectively, and being used to control the separation and engagement of the clutch (4); and An accumulator (640), the accumulator (640) is connected between the actuating proportional valve (620) and the clutch actuating oil cylinder (630), and is used to absorb the pressure shock of the clutch actuating oil circuit (600).

16. The transmission hydraulic system (1) according to any one of claims 13 to 15, characterized in that: The first control valve (320) is suitable for connecting to a vehicle controller (330), and the vehicle controller (330) is used to: If the hydraulic pressure of the clutch actuating oil circuit (600) is lower than the required hydraulic pressure, the opening of the first control valve (320) is controlled to increase to a predetermined opening, thereby increasing the flow rate flowing to the clutch actuating oil circuit (600) through the pressure regulating valve (410) to a first predetermined value, and reducing the flow rate flowing to the first on-off valve (210) through the first control valve (320) to a second predetermined value.

17. The transmission hydraulic system (1) according to any one of claims 6 to 16, characterized in that: The first cooling lubricating oil circuit (200) further comprises: A second one-way valve (220), the second one-way valve (220) is located between the second cooling lubricating oil circuit (400) and the hydraulic oil tank (100) on the first cooling lubricating oil circuit (200), and is used to prevent the oil in the second cooling lubricating oil circuit (400) from flowing back to the hydraulic oil tank (100) through the first cooling lubricating oil circuit (200).

18. The transmission hydraulic system (1) according to any one of claims 4 to 17, characterized in that: The oil pump (310) is a mechanical oil pump, and the mechanical oil pump is suitable for being drivingly connected to the engine (5).

19. The transmission hydraulic system (1) according to claim 18, characterized in that: The first cooling lubricating oil circuit (200) is also suitable for connecting the hydraulic oil tank (100) and the drive motor (3), and the first cooling lubricating oil circuit (200) comprises: An electronic oil pump (230), the electronic oil pump (230) being connected to the hydraulic oil tank (100), and the electronic oil pump (230) being used to pump oil from the hydraulic oil tank (100) to the generator (2) and the drive motor (3) through the first cooling lubricating oil circuit (200).

20. The transmission hydraulic system (1) according to claim 19, characterized in that: The electronic oil pump (230) is suitable for connecting to a vehicle controller (330), and the vehicle controller (330) is used to: When the engine (5) is started, the electronic oil pump (230) is controlled to stop working, so that the mechanical oil pump pumps the oil in the hydraulic oil tank (100) through the second cooling lubricating oil circuit (400) and the first cooling lubricating oil circuit (200) to flow to the generator (2); and When the engine (5) stops, the electronic oil pump (230) is controlled to pump the oil in the hydraulic oil tank (100) to flow to the drive motor (3) through the first cooling lubricating oil circuit (200).

21. The transmission hydraulic system (1) according to claim 20, characterized in that: The vehicle controller (330) is also used for: When the engine (5) is started, if the oil flow rate in the second cooling lubricating oil circuit (400) is lower than the required flow rate, the electronic oil pump (230) is controlled to pump the oil in the hydraulic oil tank (100) through the first cooling lubricating oil circuit (200) to flow to the generator (2); When the engine (5) stops, if the oil flow rate in the first cooling lubricating oil circuit (200) is lower than a predetermined value or the electronic oil pump (230) fails, the electronic oil pump (230) is controlled to stop working, and the engine (5) is controlled to start to start the mechanical oil pump to pump the oil in the hydraulic oil tank (100) through the second cooling lubricating oil circuit (400) and the first cooling lubricating oil circuit (200) to flow to the drive motor (3).

22. The transmission hydraulic system (1) according to any one of claims 19 to 21, characterized in that: The first cooling lubricating oil circuit (200) further comprises: a radiator (240), the radiator (240) being connected to the electronic oil pump (230) and the first on-off valve (210) respectively; and A bypass valve (250) is connected in parallel with the radiator (240), and the bypass valve (250) changes its on-off state according to the pressure difference between the liquid inlet and the liquid outlet of the radiator (240).

23. The transmission hydraulic system (1) according to claim 22, characterized in that: The first cooling lubricating oil circuit (200) further comprises: A first branch (201), the first branch (201) being connected between the radiator (240) and the generator (2), and the first on-off valve (210) being arranged on the first branch (201); a second branch (202), the second branch (202) being connected between the radiator (240) and the generator (2) and connected in parallel with the first branch (201), the second branch (202) being configured with a first damping hole (260); a third branch (203), the third branch (203) being connected between the radiator (240) and the clutch (4), and the third branch (203) being configured with a second damping hole (270); a fourth branch (204), the fourth branch (204) being connected between the radiator (240) and the drive motor (3), the third branch (204) being configured with a third damping hole (280); and A fifth branch (205), one end of the fifth branch (205) is connected between the first on-off valve (210) and the generator (2), the other end of the fifth branch (205) is connected to the transmission structure (6) of the transmission, and the fifth branch (205) is configured with a fourth damping hole (290).

24. The transmission hydraulic system (1) according to any one of claims 19 to 23, characterized in that: The electronic oil pump (230) is mounted on the outer surface of the housing of the transmission.

25. The transmission hydraulic system (1) according to any one of claims 4 to 24, characterized in that: Also includes: A cooling lubrication flow control oil circuit (700), wherein the cooling lubrication flow control oil circuit (700) is respectively connected to the first cooling lubrication oil circuit (200) and the hydraulic oil tank (100), and the cooling lubrication flow control oil circuit (700) is used to control the flow rate of the oil in the first cooling lubrication oil circuit (200) returning to the hydraulic oil tank (100) according to the temperature of the generator (2).

26. The transmission hydraulic system (1) according to claim 25, characterized in that: The cooling lubrication flow control oil circuit (700) comprises: a second control valve (710), the second control valve (710) being connected to the first cooling lubricating oil circuit (200), the second control valve (710) changing its on / off state according to the temperature of the generator (2); and a second on-off valve (720), the second on-off valve (720) being respectively connected to the first cooling and lubricating oil circuit (200), the second control valve (710) and the hydraulic oil tank (100); When the second control valve (710) is connected, the second on-off valve (720) is controlled to be connected, so as to connect the first cooling lubricating oil circuit (200) and the hydraulic oil tank (100); when the second control valve (710) is disconnected, the second on-off valve (720) is controlled to be disconnected, so as to disconnect the connection between the first cooling lubricating oil circuit (200) and the hydraulic oil tank (100).

27. A transmission (1000), characterized in that: Comprising a transmission hydraulic system (1) according to any one of claims 1-26.

28. A powertrain (2000), characterized in that: It comprises a generator (2), an engine (5) and a transmission (1000) according to claim 27.

29. A vehicle (3000), characterized in that: Comprising a powertrain (2000) according to claim 28.

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