Gearbox hydraulic system and oil control method

Abstract

The invention relates to the technical field of gearbox hydraulic control, and discloses a gearbox hydraulic system and an oil control method.The gearbox hydraulic system comprises an oil storage tank, a cooling lubricating oil way, a first oil way, a second oil way and a control oil way, the first oil way comprises an electronic pump and a first one-way valve, and a first oil inlet of the electronic pump communicates with the oil storage tank; a first oil outlet of the electronic pump is in one-way communication with the cooling lubricating oil way through a first one-way valve, the second oil way comprises a mechanical pump, a first pressure regulating valve and a second one-way valve, a second oil inlet of the mechanical pump is communicated with the oil storage tank, and a second oil outlet of the mechanical pump is communicated with a third oil inlet of the first pressure regulating valve and the pilot oil inlet. The pilot oil inlet is suitable for providing pilot oil into the first pressure regulating valve so that the third oil inlet can be communicated with the third oil outlet of the first pressure regulating valve, and the third oil outlet is communicated with the cooling lubricating oil way in a one-way mode through the second one-way valve. The cooling and lubricating requirements of the motor, the shaft gear and the clutch are met, and the cooling and lubricating efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of gearbox hydraulic control, and in particular to a gearbox hydraulic system and an oil control method. Background Art

[0002] The transmission hydraulic systems currently in mass production usually use mechanical pumps as actuator pumps to establish oil pressure through the mechanical pump to control the engagement and disengagement of the clutch. However, the current transmission hydraulic systems are difficult to meet the cooling and lubrication requirements of the motor, shaft gears, and clutch, and the cooling and lubrication efficiency is low. Summary of the invention

[0003] The present application provides a gearbox hydraulic system and an oil control method. The gearbox hydraulic system can use an electronic pump to supply oil to the cooling and lubricating oil circuit alone, can use a mechanical pump to supply oil to the cooling and lubricating oil circuit alone, or can use an electronic pump and a mechanical pump to supply oil to the cooling and lubricating oil circuit at the same time. Therefore, not only the cooling and lubrication needs of the motor, shaft gear, and clutch under various working conditions are met, but also the simultaneous supply of oil by the electronic pump and the mechanical pump is beneficial to improving the cooling and lubrication efficiency.

[0004] In order to achieve the above objectives, the main technical solutions adopted in this application include:

[0005] In a first aspect, an embodiment of the present application provides a transmission hydraulic system, comprising:

[0006] Oil storage tank;

[0007] Cooling and lubricating oil circuit: The cooling and lubricating oil circuit is used to provide oil to the motor, shaft gear and clutch;

[0008] A first oil circuit, the first oil circuit comprises an electronic pump and a first one-way valve, a first oil inlet of the electronic pump is connected to the oil storage tank, and a first oil outlet of the electronic pump is unidirectionally connected to the cooling and lubricating oil circuit through the first one-way valve;

[0009] The second oil circuit includes a mechanical pump, a first pressure regulating valve and a second one-way valve. The second oil inlet of the mechanical pump is connected to the oil storage tank. The second oil outlet of the mechanical pump is connected to the third oil inlet and the pilot oil inlet of the first pressure regulating valve. The pilot oil inlet is suitable for providing pilot oil to the first pressure regulating valve to make the third oil inlet communicate with the third oil outlet of the first pressure regulating valve. The third oil outlet is unidirectionally connected to the cooling and lubricating oil circuit through the second one-way valve.

[0010] The transmission hydraulic system proposed in the first aspect of the embodiment of the present application can use an electronic pump to supply oil to the cooling and lubricating oil circuit alone, can also use a mechanical pump to supply oil to the cooling and lubricating oil circuit alone, and can also use an electronic pump and a mechanical pump to supply oil to the cooling and lubricating oil circuit at the same time. Therefore, not only the cooling and lubrication needs of the motor, shaft gears, and clutch under various working conditions are met, but also the simultaneous supply of oil by the electronic pump and the mechanical pump is beneficial to improving the cooling and lubrication efficiency.

[0011] Optionally, it also includes: a control oil circuit, the control oil circuit includes a first control valve and a pressure reducing valve, the pressure reducing valve has a fourth oil inlet and a fourth oil outlet that are connected, the fourth oil inlet is connected to the second oil outlet, the first control valve is connected to the fourth oil outlet and the first pressure regulating valve, and the first control valve selectively provides pressurized oil to the first pressure regulating valve.

[0012] With such a configuration, the oil pressure in the control oil circuit can be reduced through the pressure reducing valve, so that the oil pressure in the control oil circuit is lower than the oil pressure in the second oil circuit, thereby reducing the loss of the main oil pressure in the second oil circuit. At the same time, controlling the first control valve to provide pressurized oil to the first pressure regulating valve can reduce the oil inlet pressure of the first pressure regulating valve, which is beneficial to reduce pressure damage and further improve the efficiency of the gearbox.

[0013] Optionally, the transmission hydraulic system further comprises:

[0014] a third oil circuit, the third oil circuit comprising a second pressure regulating valve, a fifth oil inlet of the second pressure regulating valve being connected to the second oil outlet, the fifth oil outlet of the second pressure regulating valve being connected to the first execution oil circuit, and the first execution oil circuit being used to deliver oil to the first clutch;

[0015] a fourth oil circuit, the fourth oil circuit comprising a third pressure regulating valve, a sixth oil inlet of the third pressure regulating valve being connected to the second oil outlet, the sixth oil outlet of the third pressure regulating valve being connected to the second execution oil circuit, and the second execution oil circuit being used to deliver oil to the second clutch;

[0016] The control oil circuit also includes a second control valve and a third control valve, the second control valve is connected to the second oil outlet and the second pressure regulating valve, and the second control valve is used to selectively provide pilot oil to the second pressure regulating valve to connect or disconnect the fifth oil inlet and the fifth oil outlet;

[0017] The third control valve is connected to the second oil outlet and the third pressure regulating valve. The third control valve is used to selectively provide pilot oil to the third pressure regulating valve to connect or disconnect the sixth oil inlet and the sixth oil outlet.

[0018] With this arrangement, the mechanical valve can also provide shift flow, realizing the two-speed shifting function of the gearbox, and can also provide oil to the cooling lubricating oil circuit through the second oil circuit to provide cooling lubricating oil to the motor, gear shaft, and clutch;

[0019] Optionally, the cooling and lubricating oil circuit also includes an oil cooler, which has a connected seventh oil inlet and a seventh oil outlet, the first oil outlet is unidirectionally connected to the seventh oil inlet through a first one-way valve, and the second oil outlet is unidirectionally connected to the seventh oil inlet through a second one-way valve, and the seventh oil outlet is used to provide oil to the motor, shaft teeth, and clutch.

[0020] With this arrangement, the oil cooler further reduces the temperature of the oil delivered to the motor, shaft gears, and clutch, which is beneficial to further improve the cooling effect on the motor, shaft gears, and clutch.

[0021] Optionally, a filter is provided between the mechanical pump, the electronic pump and the oil storage tank.

[0022] This setting can filter impurities in the oil and ensure the normal operation of the transmission hydraulic system.

[0023] Optionally, the first actuating oil circuit is provided with a first pressure sensor, and the first pressure sensor is used to test the pressure of the first actuating oil circuit;

[0024] The second actuating oil circuit is provided with a second pressure sensor, and the second pressure sensor is used to test the pressure of the second actuating oil circuit.

[0025] This arrangement ensures the stability and reliability of the operation of the first clutch and the second clutch, and reduces the wear and failure of the first clutch and the second clutch.

[0026] In a second aspect, an embodiment of the present application provides an oil control method. The gearbox hydraulic system in the embodiment of the first aspect adopts an oil control method, and the oil control method includes:

[0027] Determine the operating mode of the transmission;

[0028] If the transmission is in pure electric mode, control the operation of the electronic pump;

[0029] If the transmission is not in pure electric mode, the mechanical pump is controlled to run and the motor temperature is obtained. If the motor temperature is greater than the preset temperature, the electronic pump is controlled to run.

[0030] The oil control method proposed in the second aspect of the embodiment of the present application can provide oil to the cooling and lubricating oil circuit alone through an electronic pump when the gearbox is in pure electric mode, and can provide oil to the cooling and lubricating oil circuit alone through a mechanical pump when the gearbox is not in pure electric mode. When the motor temperature is greater than a preset temperature, oil can be provided to the cooling and lubricating oil circuit simultaneously through an electronic pump and a mechanical pump. In this way, not only the cooling and lubrication needs of the motor, shaft gears, and clutch under various working conditions are met, but also the simultaneous provision of oil by an electronic pump and a mechanical pump is beneficial to improving the cooling and lubrication efficiency.

[0031] Optionally, if the transmission is in pure electric mode, the method further includes:

[0032] Get the motor temperature;

[0033] If the motor temperature is greater than the preset temperature, the speed of the electronic pump is increased.

[0034] With this setting, when the motor temperature is greater than the preset temperature or the temperature rises rapidly, the oil supply to the cooling lubrication oil circuit can be increased by increasing the speed of the electronic pump, thereby improving the cooling effect on the motor and preventing the motor from being damaged due to overheating.

[0035] Optionally, if the transmission is in a non-pure electric mode, the method further includes:

[0036] If the gearbox is in series mode, the first control valve is controlled to provide pressure oil to the first pressure regulating valve.

[0037] Such an arrangement can reduce the oil inlet pressure of the first pressure regulating valve, thereby helping to reduce pressure damage and further improve the efficiency of the transmission.

[0038] Optionally, if the transmission is in a non-pure electric mode, the method further includes:

[0039] If the gearbox is in direct drive mode or parallel mode, control the first control valve to stop supplying pressure oil to the first pressure regulating valve, and obtain the vehicle speed or accelerator pedal angle;

[0040] According to the vehicle speed or the accelerator pedal angle, the second control valve is controlled to supply pilot oil to the second pressure regulating valve and the third control valve is controlled to stop supplying pilot oil to the third pressure regulating valve, or the second control valve is controlled to stop supplying pilot oil to the second pressure regulating valve and the third control valve is controlled to supply pilot oil to the third pressure regulating valve.

[0041] With this arrangement, the mechanical valve can also provide shift flow, realizing the two-speed shifting function of the gearbox. At the same time, it can also provide oil to the cooling lubricating oil circuit through the second oil circuit to provide cooling lubricating oil to the motor, gear shaft, and clutch. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0043] Figure 1 A schematic diagram of a transmission hydraulic system provided by one embodiment of the present application;

[0044] Figure 2 A flow chart of an oil control method provided by one embodiment of the present application;

[0045] Figure 3 A flow chart of an oil control method provided by another embodiment of the present application;

[0046] Figure 4 A flow chart of an oil control method provided in yet another embodiment of the present application.

[0047] [Description of Reference Numerals]

[0048] Transmission hydraulic system 100;

[0049] Oil storage tank 1;

[0050] Cooling lubricating oil circuit 2; oil cooler 21; seventh oil inlet 211; seventh oil outlet 212; first safety relief valve 22;

[0051] First oil circuit 3; electronic pump 31; first oil inlet 311; first oil outlet 312; first check valve 32;

[0052] The second oil circuit 4; the mechanical pump 41; the second oil inlet 411; the second oil outlet 412; the first pressure regulating valve 42; the third oil inlet 421; the third oil outlet 422; the pilot oil inlet 423; the second non-return valve 43; the second safety relief valve 44;

[0053] Control oil circuit 5; first control valve 51; pressure reducing valve 52; fourth oil inlet 521; fourth oil outlet 522; second control valve 53; third control valve 54;

[0054] The third oil circuit 6; the second pressure regulating valve 61; the fifth oil inlet 611; the fifth oil outlet 612;

[0055] Fourth oil circuit 7; third pressure regulating valve 71; sixth oil inlet 711; sixth oil outlet 712;

[0056] First execution oil circuit 8; first pressure sensor 81;

[0057] First clutch 9;

[0058] Second execution oil circuit 10; second pressure sensor 101;

[0059] A second clutch 11;

[0060] Filter 12. DETAILED DESCRIPTION

[0061] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0062] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0063] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0064] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0065] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0066] The term "multiple" as used in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple sheets" refers to more than two sheets (including two sheets).

[0067] The transmission hydraulic systems currently in mass production usually use mechanical pumps as actuator pumps to establish oil pressure through the mechanical pump to control the engagement and disengagement of the clutch. However, the current transmission hydraulic systems are difficult to meet the cooling and lubrication requirements of the motor, shaft gears, and clutch, and the cooling and lubrication efficiency is low.

[0068] Based on this, the present application proposes a transmission hydraulic system 100, which can use an electronic pump 31 to provide oil to the cooling and lubricating oil circuit 2 alone, or use a mechanical pump 41 to provide oil to the cooling and lubricating oil circuit 2 alone, or use an electronic pump 31 and a mechanical pump 41 to provide oil to the cooling and lubricating oil circuit 2 at the same time. Therefore, not only the cooling and lubrication needs of the motor, shaft gears, and clutch under various working conditions are met, but also the simultaneous provision of oil by the electronic pump 31 and the mechanical pump 41 is beneficial to improving the cooling and lubrication efficiency.

[0069] The transmission hydraulic system 100 and the oil control method proposed in the embodiments of the present application are described below with reference to the accompanying drawings.

[0070] like Figure 1-Figure 4 As shown, the transmission hydraulic system 100 according to the first embodiment of the present application includes: an oil storage tank 1, a cooling and lubricating oil circuit 2, a first oil circuit 3, a second oil circuit 4 and a control oil circuit 5.

[0071] Among them, the cooling and lubricating oil circuit 2 is used to provide oil to the motor, shaft gears, and clutch. The first oil circuit 3 includes an electronic pump 31 and a first one-way valve 32. The first oil inlet 311 of the electronic pump 31 is connected to the oil storage tank 1, and the first oil outlet 312 of the electronic pump 31 is unidirectionally connected to the cooling and lubricating oil circuit 2 through the first one-way valve 32. The second oil circuit 4 includes a mechanical pump 41, a first pressure regulating valve 42 and a second one-way valve 43. The second oil inlet 411 of the mechanical pump 41 is connected to the oil storage tank 1, and the second oil outlet 412 of the mechanical pump 41 is connected to the third oil inlet 421 and the pilot oil inlet 423 of the first pressure regulating valve 42. The pilot oil inlet 423 is suitable for providing pilot oil to the first pressure regulating valve 42 to make the third oil inlet 421 communicate with the third oil outlet 422 of the first pressure regulating valve 42, and the third oil outlet 422 is unidirectionally connected to the cooling and lubricating oil circuit 2 through the second one-way valve 43.

[0072] It should be noted that shaft gears, motors (such as P1 motors and P3 motors), and clutches are usually used to transmit power and change speed in hybrid vehicles. Therefore, friction and wear will occur during operation, and a large amount of heat will also be generated. Therefore, the shaft gears, clutches, and motors need to be cooled and lubricated.

[0073] Based on this, the cooling and lubricating oil circuit 2 in the present application is used to provide cooling and lubricating oil to the motor, shaft teeth, and clutch. In this way, lubricating the shaft teeth with oil can not only reduce the direct contact between the tooth surfaces of the shaft teeth, but also prevent the shaft teeth from sticking and jamming, thereby ensuring the smooth engagement and operation of the shaft teeth. The oil can also take away the heat generated during the high-speed operation of the shaft teeth, which is beneficial to reduce the wear and metal fatigue of the shaft teeth, thereby improving the mechanical properties and service life.

[0074] At the same time, cooling the motor with oil helps to reduce the motor temperature and ensure that it runs at a safe and efficient operating temperature, avoiding damage to the motor due to overheating. Compared with water cooling, oil has a larger specific heat capacity and can therefore absorb more heat. In addition, since the vaporization temperature of oil is usually higher than that of water, oil cooling is more stable and durable in high temperature environments. At the same time, the bearings and other moving parts in the motor need to be properly lubricated with oil to reduce friction and wear, thereby making the motor run more smoothly and efficiently, reducing the noise and vibration of the motor, and helping to improve ride comfort and driving experience.

[0075] Similarly, lubricating the clutch with oil helps reduce friction and wear of the clutch to prevent the clutch from overheating and affecting its performance, thereby helping to increase the service life of the clutch and reduce the frequency of maintenance and parts replacement.

[0076] Furthermore, in some embodiments of the present application, the first oil circuit 3 and the second oil circuit 4 of the transmission hydraulic system 100 can be selectively connected between the oil storage tank 1 and the cooling and lubricating oil circuit 2 to provide oil to the cooling and lubricating oil circuit 2 solely through the first oil circuit 3, or to provide oil to the cooling and lubricating oil circuit 2 solely through the second oil circuit 4, or to provide oil to the cooling and lubricating oil circuit 2 through the first oil circuit 3 and the second oil circuit 4 at the same time.

[0077] Specifically, the mechanical pump 41 of the second oil circuit 4 is driven by the engine. When the hybrid vehicle operates in the pure electric mode, the electronic pump 31 in the first oil circuit 3 is operated. The electronic pump 31 draws oil from the oil storage tank 1. The oil flows into the electronic pump 31 from the first oil inlet 311 and flows out from the first oil outlet 312. In this way, the first one-way valve 32 unidirectionally connects the first oil outlet 312 and the cooling lubricating oil circuit 2 under the push of the oil, so that the oil in the oil storage tank 1 enters the cooling lubricating oil circuit 2, and the first oil circuit 3 supplies oil to the cooling lubricating oil circuit 2 alone.

[0078] It should be noted that when the electronic pump 31 is running, the operating temperature of the motor can be obtained in real time through the temperature sensor. When the operating temperature of the motor is high or the temperature rises rapidly, the oil supply to the cooling lubricating oil circuit 2 can be increased by increasing the speed of the electronic pump 31 to improve the cooling effect on the motor and prevent the motor from being damaged due to overheating.

[0079] When the hybrid vehicle is running in a non-pure electric mode, for example, when the hybrid vehicle is running in a parallel, direct drive or series mode, the engine is working, and the engine drives the mechanical pump 41 in the second oil circuit 4 to operate, and the mechanical pump 41 extracts oil from the oil storage tank 1, and the oil flows out from the second oil outlet 412 of the mechanical pump 41, wherein a part of the oil flowing out of the second oil outlet 412 flows into the pilot oil inlet 423 of the first pressure regulating valve 42, for example, Figure 1 As shown, the pilot oil inlet 423 can provide a pilot pressure to the valve core in the first pressure regulating valve 42 to drive it to move, so that the third oil inlet 421 of the first pressure regulating valve 42 is connected to the third oil outlet 422, and further, another part of the oil flowing out of the second oil outlet 412 flows into the first pressure regulating valve 42 from the third oil inlet 421 and flows out from the third oil outlet 422. In this way, the second one-way valve 43 unidirectionally connects the third oil outlet 422 and the cooling lubricating oil circuit 2 under the push of the oil, so that the oil in the oil storage tank 1 enters the cooling lubricating oil circuit 2, and the second oil circuit 4 supplies oil to the cooling lubricating oil circuit 2 separately.

[0080] It should be noted that since the mechanical pump 41 is connected to the engine input shaft, the speed of the mechanical pump 41 is controlled by the engine speed, and therefore the oil supply cannot be controlled independently. When the temperature sensor detects that the motor operating temperature is high or the temperature rises rapidly, the electronic pump 31 can be started to enable the first oil circuit 3 and the second oil circuit 4 to supply oil to the cooling lubrication oil circuit 2 at the same time, thereby improving the cooling efficiency. The speed of the electronic pump 31 can be flexibly adjusted according to the motor operating temperature, thereby meeting the lubrication requirements of the motor, shaft gears, and clutch under different working conditions.

[0081] To sum up, the transmission hydraulic system 100 proposed in the embodiment of the first aspect of the present application can use the electronic pump 31 to provide oil to the cooling and lubricating oil circuit 2 alone, or use the mechanical pump 41 to provide oil to the cooling and lubricating oil circuit 2 alone, or use the electronic pump 31 and the mechanical pump 41 to provide oil to the cooling and lubricating oil circuit 2 at the same time. Therefore, it not only meets the cooling and lubrication needs of the motor, shaft gears, and clutch under various working conditions, but also helps to improve the cooling and lubrication efficiency by providing oil simultaneously through the electronic pump 31 and the mechanical pump 41.

[0082] In some embodiments of the present application, Figure 1 As shown, the transmission hydraulic system 100 also includes: a control oil circuit 5, the control oil circuit 5 includes a first control valve 51 and a pressure reducing valve 52, the pressure reducing valve 52 has a fourth oil inlet 521 and a fourth oil outlet 522 that are connected, the fourth oil inlet 521 is connected to the second oil outlet 412, the first control valve 51 is connected to the fourth oil outlet 522 and the first pressure regulating valve 42, and the first control valve 51 selectively provides pressurized oil to the first pressure regulating valve 42.

[0083] Specifically, a portion of the oil flowing out from the second oil outlet 412 flows into the pressure reducing valve 52 through the fourth oil inlet 521, and then flows into the first control valve 51 from the fourth oil outlet 522 of the pressure reducing valve 52. The first control valve 51 selectively provides pressurized oil to the first pressure regulating valve 42. It should be noted that the oil pressure of the control oil circuit 5 can be reduced by the pressure reducing valve 52, so that the oil pressure of the control oil circuit 5 is lower than the oil pressure of the second oil circuit 4, thereby reducing the loss of the main oil pressure of the second oil circuit 4.

[0084] When the hybrid vehicle operates in series mode, the engine does not directly drive the vehicle, so there is no need to build up clutch oil pressure. The first control valve 51 is controlled to provide pressurized oil to the first pressure regulating valve 42. At this time, the oil inlet pressure of the first pressure regulating valve 42 can be reduced, which is beneficial to reduce pressure damage and further improve the transmission efficiency.

[0085] In some embodiments of the present application, the first control valve 51 can be constructed as a normally high solenoid valve, and the first pressure regulating valve 42 can be constructed as a pilot proportional relief valve. When the first control valve 51 is not energized, the first control valve 51 provides pressurized oil to the first pressure regulating valve 42.

[0086] In some embodiments of the present application, Figure 1 As shown, the transmission hydraulic system 100 further includes: a third oil circuit 6 and a fourth oil circuit 7 .

[0087] The third oil circuit 6 includes a second pressure regulating valve 61, a fifth oil inlet 611 of the second pressure regulating valve 61 is connected to the second oil outlet 412, and the fifth oil outlet 612 of the second pressure regulating valve 61 is connected to the first execution oil circuit 8, and the first execution oil circuit 8 is used to deliver oil to the first clutch 9. The fourth oil circuit 7 includes a third pressure regulating valve 71, a sixth oil inlet 711 of the third pressure regulating valve 71 is connected to the second oil outlet 412, and the sixth oil outlet 712 of the third pressure regulating valve 71 is connected to the second execution oil circuit 10, and the second execution oil circuit 10 is used to deliver oil to the second clutch 11. The control oil circuit 5 also includes a second control valve 53 and a third control valve 54. The second control valve 53 is connected to the second oil outlet 412 and the second pressure regulating valve 61. The second control valve 53 is used to selectively provide pilot oil to the second pressure regulating valve 61 to connect or disconnect the fifth oil inlet 611 and the fifth oil outlet 612. The third control valve 54 is connected to the second oil outlet 412 and the third pressure regulating valve 71. The third control valve 54 is used to selectively provide pilot oil to the third pressure regulating valve 71 to connect or disconnect the sixth oil inlet 711 and the sixth oil outlet 712.

[0088] Specifically, the transmission hydraulic system 100 can also control the engagement of the first clutch 9 through the third oil circuit 6 and control the engagement of the second clutch 11 through the fourth oil circuit 7. When the hybrid vehicle operates in parallel or direct drive mode, the engine is working and used to drive the vehicle, so it is necessary to establish the main oil pressure in the second oil circuit 2, that is, control the first control valve 51 to stop supplying pressure oil to the first pressure regulating valve 42, and the second pressure regulating valve 61 and the third pressure regulating valve 71 can output pressure. For example, the first control valve 51 can be constructed as a normally high solenoid valve, and the first pressure regulating valve 42 can be constructed as a pilot proportional relief valve. When the first control valve 51 is energized, the first control valve 51 stops supplying pressure oil to the first pressure regulating valve 42, and the second oil circuit 4 establishes the main oil pressure, and then the clutch oil pressure can be established.

[0089] Furthermore, when the mechanical pump 41 is running, the mechanical pump 41 draws oil from the oil storage tank 1 and transports the oil to the second oil outlet 412, wherein part of the oil flowing out of the second oil outlet 412 flows into the control oil circuit 5, and when the second control valve 53 in the control oil circuit 5 provides pilot oil to the second pressure regulating valve 61, the fifth oil inlet 611 of the second pressure regulating valve 61 is connected to the fifth oil outlet 612, so that part of the oil flowing out of the second oil outlet 412 can flow into the first execution oil circuit 8 through the third oil circuit 6, and the first execution oil circuit 8 can supply oil to the first clutch 9 to drive the first clutch 9 in the gearbox to engage, and when the second control valve 53 in the control oil circuit 5 stops providing pilot oil to the second pressure regulating valve 61, the fifth oil inlet 611 of the second pressure regulating valve 61 is disconnected from the fifth oil outlet 612, so that the first execution oil circuit 8 An execution oil circuit 8 stops supplying oil to the first clutch 9, thereby opening the first clutch 9; similarly, when the third control valve 54 in the control oil circuit 5 supplies pilot oil to the third pressure regulating valve 71, the sixth oil inlet 711 of the third pressure regulating valve 71 is connected to the sixth oil outlet 712, so that part of the oil flowing out from the second oil outlet 412 can flow into the second execution oil circuit 10 through the fourth oil circuit 7, and the second execution oil circuit 10 can supply oil to the second clutch 11 to drive the second clutch 11 in the gearbox to engage, and when the third control valve 54 in the control oil circuit 5 stops supplying pilot oil to the third pressure regulating valve 71, the sixth oil inlet 711 of the third pressure regulating valve 71 is disconnected from the sixth oil outlet 712, so that the second execution oil circuit 10 stops supplying oil to the second clutch 11, thereby opening the second clutch 11.

[0090] Further, in order to enable those skilled in the art to better understand the present solution, the second control valve 53 and the third control valve 54 in the present application are both constructed as normally low solenoid valves, the second pressure regulating valve 61 and the third pressure regulating valve 71 are both constructed as pilot proportional pressure reducing valves 52, and when the second control valve 53 is energized, the second control valve 53 provides pilot oil to the second pressure regulating valve 61, and when the second control valve 53 is de-energized, the second control valve 53 stops providing pilot oil to the second pressure regulating valve 61, and similarly, when the third control valve 54 is energized, the third control valve 54 stops providing pilot oil to the second pressure regulating valve 61. The control valve 54 supplies pilot oil to the third pressure regulating valve 71. When the third control valve 54 is powered off, the third control valve 54 stops supplying pilot oil to the third pressure regulating valve 71. Assuming that the second clutch 11 corresponds to a higher vehicle speed than the first clutch 9, when the hybrid vehicle operates in parallel or direct drive mode, the engine is working, the engine drives the mechanical pump 41 to operate, the first control valve 51 (normally high solenoid valve) is energized, the first pressure regulating valve 42 establishes main oil pressure in the second oil circuit 4, and the second oil circuit 4 supplies oil to the cooling and lubricating oil circuit 2.

[0091] At the same time, the vehicle controller controls the second control valve 53 to supply pilot oil to the second pressure regulating valve 61 and controls the third control valve 54 to stop supplying pilot oil to the third pressure regulating valve 71 according to the vehicle speed or the accelerator pedal angle, or controls the second control valve 53 to stop supplying pilot oil to the second pressure regulating valve 61 and controls the third control valve 54 to supply pilot oil to the third pressure regulating valve 71. For example, when the vehicle speed or the accelerator pedal angle is small, the second control valve 53 is energized, the third control valve 54 is de-energized, the second control valve 53 supplies pilot oil to the second pressure regulating valve 61, and the third control valve 54 stops supplying pilot oil to the third pressure regulating valve 71. That is to say, the first execution oil circuit 8 supplies oil to the first clutch 9 to drive the first clutch 9 in the gearbox to engage, and the second execution oil circuit 10 stops supplying oil to the second clutch 11, so that the second clutch 11 is opened, that is, the first clutch 9 is driven The vehicle is driven to run, so that the vehicle is in a low gear. When the vehicle speed or the accelerator pedal angle is large, the second control valve 53 is de-energized, and the third control valve 54 is energized. The second control valve 53 stops supplying pilot oil to the second pressure regulating valve 61, and the third control valve 54 supplies pilot oil to the third pressure regulating valve 71. That is to say, the second execution oil circuit 10 supplies oil to the second clutch 11 to drive the second clutch 11 in the gearbox to engage, and the first execution oil circuit 8 stops supplying oil to the first clutch 9, so that the first clutch 9 is opened, that is, the vehicle is driven by the second clutch 11 to run, so that the vehicle is in a high gear. With this arrangement, the mechanical valve can also provide shift flow, realizing the two-gear shifting function of the gearbox, and at the same time, it can also provide oil to the cooling lubricating oil circuit 2 through the second oil circuit 4 to provide cooling lubricating oil to the motor, the gear shaft, the first clutch 9, and the second clutch 11. It should be noted that when the temperature sensor detects that the motor operating temperature is high or the temperature rises rapidly, the electronic pump 31 can be started to enable the first oil circuit 3 and the second oil circuit 4 to supply oil to the cooling lubricating oil circuit 2 at the same time, thereby improving the cooling efficiency. The speed of the electronic pump 31 can be flexibly adjusted according to the motor operating temperature, and can meet the lubrication requirements of the motor, shaft gears, first clutch 9, and second clutch 11 under different working conditions.

[0092] In some embodiments of the present application, Figure 1As shown, the cooling and lubricating oil circuit 2 also includes an oil cooler 21, and the oil cooler 21 has a seventh oil inlet 211 and a seventh oil outlet 212 that are connected. The first oil outlet 312 is unidirectionally connected to the seventh oil inlet 211 through the first one-way valve 32, and the second oil outlet 412 is unidirectionally connected to the seventh oil inlet 211 through the second one-way valve 43. The seventh oil outlet 212 is used to provide oil to the motor, shaft gear, and clutch. In other words, the oil provided by the first oil circuit 3 and the second oil circuit 4 is cooled by the oil cooler 21 and then transported to the motor, shaft gear, and clutch for cooling and lubrication. With this arrangement, the oil cooler 21 further reduces the temperature of the oil transported to the motor, shaft gear, and clutch, which is conducive to further improving the cooling effect of the motor, shaft gear, and clutch.

[0093] In some embodiments of the present application, Figure 1 As shown, the cooling lubricating oil circuit 2 is further provided with a first safety relief valve 22, and the second oil circuit 4 is further provided with a second safety relief valve 44. In this way, the first safety relief valve 22 can provide protection when the oil pressure in the cooling lubricating oil circuit 2 is too high, and the second safety relief valve 44 can provide protection when the oil pressure in the second oil circuit 4 is too high.

[0094] In some embodiments of the present application, Figure 1 As shown, a filter 12 is provided between the mechanical pump 41, the electronic pump 31 and the oil storage tank 1. That is, when the mechanical pump 41 and the electronic pump 31 are running, the oil drawn from the oil storage tank 1 by the mechanical pump 41 and the electronic pump 31 must first be filtered by the filter 12, so as to filter out impurities in the oil and ensure the normal operation of the transmission hydraulic system 100.

[0095] In some embodiments of the present application, Figure 1 As shown, the first actuating oil circuit 8 is provided with a first pressure sensor 81 for testing the pressure of the first actuating oil circuit 8 , and the second actuating oil circuit 10 is provided with a second pressure sensor 101 for testing the pressure of the second actuating oil circuit 10 .

[0096] Specifically, the first pressure sensor 81 can monitor the real-time pressure of the first execution oil circuit 8, and has fed back the real-time pressure to the vehicle controller, so that the first clutch 9 can be precisely regulated by adjusting the second control valve 53 to the pilot oil pressure of the second pressure valve, thereby ensuring the smoothness and reliability of the operation of the first clutch 9 and reducing the wear and failure of the first clutch 9; similarly, the second pressure sensor 101 can monitor the real-time pressure of the second execution oil circuit 10, and has fed back the real-time pressure to the vehicle controller, so that the second clutch 11 can be precisely regulated by adjusting the third control valve 54 to the pilot oil pressure of the third pressure valve, thereby ensuring the smoothness and reliability of the operation of the second clutch 11 and reducing the wear and failure of the second clutch 11.

[0097] In order to further improve the oil control level of the transmission hydraulic system 100, the present application also provides an oil control method based on the transmission hydraulic system 100, wherein the transmission hydraulic system 100 is the transmission hydraulic system 100 in the above-mentioned first aspect embodiment.

[0098] The oil control method proposed in the embodiment of the present application is described in detail below with reference to the accompanying drawings.

[0099] Figure 2 FIG. 1 is a flow chart of an oil control method according to a first embodiment of the present application. Figure 2 As shown, the oil control method includes:

[0100] Step S101, determining the working mode of the gearbox.

[0101] Specifically, the working mode of the transmission is determined according to the working mode of the hybrid vehicle, wherein the hybrid vehicle has a pure electric mode and a non-pure electric mode (parallel, direct drive, series).

[0102] Step S102, if the transmission is in pure electric mode, control the electronic pump to operate.

[0103] When the hybrid vehicle operates in the pure electric mode, the gearbox is in the pure electric mode, and the vehicle controller controls the operation of the electronic pump 31 in the first oil circuit 3. The electronic pump 31 draws oil from the oil storage tank 1, and the oil flows into the electronic pump 31 from the first oil inlet 311 and flows out from the first oil outlet 312. In this way, under the push of the oil, the first one-way valve 32 unidirectionally connects the first oil outlet 312 and the cooling lubricating oil circuit 2, so that the oil in the oil storage tank 1 enters the cooling lubricating oil circuit 2, and the first oil circuit 3 supplies oil to the cooling lubricating oil circuit 2 alone.

[0104] Step S103, if the gearbox is in non-pure electric mode, control the mechanical pump to operate, and obtain the motor temperature. If the motor temperature is greater than a preset temperature, control the electronic pump to operate.

[0105] When the hybrid vehicle is running in a non-pure electric mode, the gearbox is in a non-pure electric mode, for example, the gearbox is running in a parallel, direct drive or series mode, the engine is working, and the engine drives the mechanical pump 41 in the second oil circuit 4 to run, and the mechanical pump 41 draws oil from the oil storage tank 1, and the oil flows out from the second oil outlet 412 of the mechanical pump 41, wherein a part of the oil flowing out from the second oil outlet 412 flows into the pilot oil inlet 423 of the first pressure regulating valve 42. For example, Figure 1As shown, the pilot oil inlet 423 can provide a pilot pressure to the valve core in the first pressure regulating valve 42 to drive it to move, so that the third oil inlet 421 of the first pressure regulating valve 42 is connected to the third oil outlet 422, and further, another part of the oil flowing out of the second oil outlet 412 flows into the first pressure regulating valve 42 from the third oil inlet 421 and flows out from the third oil outlet 422. In this way, the second one-way valve 43 unidirectionally connects the third oil outlet 422 and the cooling lubricating oil circuit 2 under the push of the oil, so that the oil in the oil storage tank 1 enters the cooling lubricating oil circuit 2, and the second oil circuit 4 supplies oil to the cooling lubricating oil circuit 2 separately.

[0106] It should be noted that the motor temperature can be detected in real time by a temperature sensor. When the motor temperature is greater than a preset temperature or the temperature rises rapidly, the electronic pump 31 can be started to simultaneously supply oil to the cooling lubrication oil circuit 2 through the first oil circuit 3 and the second oil circuit 4. In this way, the cooling efficiency is improved, and the speed of the electronic pump 31 can be flexibly adjusted according to the operating temperature of the motor, thereby meeting the lubrication requirements of the motor, shaft gears, and clutch under different working conditions.

[0107] The oil control method proposed in the second aspect of the embodiment of the present application is that when the gearbox is in pure electric mode, oil can be provided to the cooling lubricating oil circuit 2 alone through the electronic pump 31; when the gearbox is in non-pure electric mode, oil can be provided to the cooling lubricating oil circuit 2 alone through the mechanical pump 41; and when the motor temperature is greater than the preset temperature, oil can be provided to the cooling lubricating oil circuit 2 by the electronic pump 31 and the mechanical pump 41 at the same time. In this way, not only the cooling and lubrication needs of the motor, shaft gears, and clutch under various working conditions are met, but also the simultaneous provision of oil by the electronic pump 31 and the mechanical pump 41 is beneficial to improving the cooling and lubrication efficiency.

[0108] In some embodiments of the present application, if the gearbox is in pure electric mode, such as Figure 3 As shown, the method also includes:

[0109] Step S201, obtaining the motor temperature.

[0110] Step S202: if the motor temperature is greater than a preset temperature, the speed of the electronic pump is increased.

[0111] Specifically, when the gearbox is in pure electric mode, the motor temperature is detected in real time by a temperature sensor. When the motor temperature is greater than a preset temperature or the temperature rises rapidly, the oil supply to the cooling lubrication oil circuit 2 can be increased by increasing the speed of the electronic pump 31, thereby improving the cooling effect on the motor and preventing the motor from being damaged due to overheating.

[0112] In some embodiments of the present application, if the transmission is in a non-pure electric mode, the method further includes: if the transmission is in a series mode, controlling the first control valve to provide pressurized oil to the first pressure regulating valve.

[0113] Specifically, the first control valve 51 selectively provides pressurized oil to the first pressure regulating valve 42. When the hybrid vehicle operates in series mode, the engine does not directly drive the vehicle, so there is no need to establish clutch oil pressure. The first control valve 51 is controlled to provide pressurized oil to the first pressure regulating valve 42. At this time, the oil inlet pressure of the first pressure regulating valve 42 can be reduced, which is beneficial to reduce pressure damage and further improve the efficiency of the transmission.

[0114] In some embodiments of the present application, the first control valve 51 can be constructed as a normally high solenoid valve, and the first pressure regulating valve 42 can be constructed as a pilot proportional relief valve. When the first control valve 51 is not energized, the first control valve 51 provides pressurized oil to the first pressure regulating valve 42.

[0115] In some embodiments of the present application, if the gearbox is in non-pure electric mode, such as Figure 4 As shown, the method also includes:

[0116] Step S301, if the gearbox is in direct drive mode or parallel mode, control the first control valve to stop supplying pressure oil to the first pressure regulating valve, and obtain the vehicle speed or accelerator pedal angle.

[0117] Step S302, according to the vehicle speed or the accelerator pedal angle, controls the second control valve to supply pilot oil to the second pressure regulating valve and controls the third control valve to stop supplying pilot oil to the third pressure regulating valve, or controls the second control valve to stop supplying pilot oil to the second pressure regulating valve and controls the third control valve to supply pilot oil to the third pressure regulating valve.

[0118] Specifically, when the hybrid vehicle operates in parallel or direct drive mode, the engine works and is used to drive the vehicle, so it is necessary to establish a main oil pressure in the second oil circuit 2, that is, the first control valve 51 is controlled to stop supplying pressurized oil to the first pressure regulating valve 42, and the second pressure regulating valve 61 and the third pressure regulating valve 71 can output pressure. For example, the first control valve 51 can be constructed as a normally high solenoid valve, and the first pressure regulating valve 42 can be constructed as a pilot proportional relief valve. When the first control valve 51 is energized, the first control valve 51 stops supplying pressurized oil to the first pressure regulating valve 42, and the second oil circuit 4 establishes the main oil pressure. The second oil circuit 4 supplies oil to the cooling and lubricating oil circuit 2, and then the clutch oil pressure can be established.

[0119] Further, assuming that the second control valve 53 and the third control valve 54 in the present application are both constructed as normally low solenoid valves, and the second pressure regulating valve 61 and the third pressure regulating valve 71 are both constructed as pilot proportional pressure reducing valves 52, when the second control valve 53 is energized, the second control valve 53 supplies pilot oil to the second pressure regulating valve 61, and when the second control valve 53 is de-energized, the second control valve 53 stops supplying pilot oil to the second pressure regulating valve 61. Similarly, when the third control valve 54 is energized, the third control valve 54 supplies pilot oil to the third pressure regulating valve 71, and when the third control valve 54 is de-energized, the third control valve 54 stops supplying pilot oil to the third pressure regulating valve 71. Assuming that the second clutch 11 corresponds to a higher vehicle speed relative to the first clutch 9.

[0120] Further, the vehicle controller controls the second control valve 53 to supply pilot oil to the second pressure regulating valve 61 and controls the third control valve 54 to stop supplying pilot oil to the third pressure regulating valve 71 according to the vehicle speed or the accelerator pedal angle, or controls the second control valve 53 to stop supplying pilot oil to the second pressure regulating valve 61 and controls the third control valve 54 to supply pilot oil to the third pressure regulating valve 71. For example, when the vehicle speed or the accelerator pedal angle is small, the second control valve 53 is energized, the third control valve 54 is de-energized, the second control valve 53 supplies pilot oil to the second pressure regulating valve 61, and the third control valve 54 stops supplying pilot oil to the third pressure regulating valve 71. In other words, the first execution oil circuit 8 supplies oil to the first clutch 9 to drive the first clutch 9 in the gearbox. The second actuating oil circuit 10 stops supplying oil to the second clutch 11, so that the second clutch 11 is opened, that is, the vehicle is driven by the first clutch 9 to run in a low gear. When the vehicle speed or the accelerator pedal angle is large, the second control valve 53 is powered off, the third control valve 54 is powered on, the second control valve 53 stops supplying pilot oil to the second pressure regulating valve 61, and the third control valve 54 supplies pilot oil to the third pressure regulating valve 71. In other words, the second actuating oil circuit 10 supplies oil to the second clutch 11 to drive the second clutch 11 in the gearbox to engage, and the first actuating oil circuit 8 stops supplying oil to the first clutch 9, so that the first clutch 9 is opened, that is, the vehicle is driven by the second clutch 11 to run, so that the vehicle is in a high gear.

[0121] With such a configuration, the mechanical valve can also provide shift flow, realize the two-speed shift function of the gearbox, and can also provide oil to the cooling lubricating oil circuit 2 through the second oil circuit 4, so as to provide cooling lubricating oil to the motor, the gear shaft, the first clutch 9, and the second clutch 11. It should be noted that when the temperature sensor detects that the motor operating temperature is high or the temperature rises quickly, the first oil circuit 3 and the second oil circuit 4 can be started by starting the electronic pump 31 to supply oil to the cooling lubricating oil circuit 2 at the same time, thereby improving the cooling efficiency, and the speed of the electronic pump 31 can be flexibly adjusted according to the motor operating temperature, which can meet the lubrication requirements of the motor, the shaft gear, the first clutch 9, and the second clutch 11 under different working conditions.

[0122] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0123] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0124] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

[0125] Although the embodiments of the present application have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A gearbox hydraulic system, characterized in that: include: Oil storage tank; A cooling and lubricating oil circuit, which is used to provide oil to the motor, shaft gears, and clutch; a first oil circuit, the first oil circuit comprising an electronic pump and a first one-way valve, a first oil inlet of the electronic pump being in communication with the oil storage tank, and a first oil outlet of the electronic pump being in one-way communication with the cooling and lubricating oil circuit through the first one-way valve; The second oil circuit includes a mechanical pump, a first pressure regulating valve and a second one-way valve, the second oil inlet of the mechanical pump is connected to the oil storage tank, the second oil outlet of the mechanical pump is connected to the third oil inlet and the pilot oil inlet of the first pressure regulating valve, the pilot oil inlet is suitable for providing pilot oil to the first pressure regulating valve to make the third oil inlet communicate with the third oil outlet of the first pressure regulating valve, and the third oil outlet is unidirectionally connected to the cooling and lubricating oil circuit through the second one-way valve.

2. The transmission hydraulic system according to claim 1, characterized in that: Also includes: A control oil circuit, the control oil circuit includes a first control valve and a pressure reducing valve, the pressure reducing valve has a fourth oil inlet and a fourth oil outlet that are connected, the fourth oil inlet is connected to the second oil outlet, the first control valve is connected to the fourth oil outlet and the first pressure regulating valve, and the first control valve selectively provides pressurized oil to the first pressure regulating valve.

3. The gearbox hydraulic system according to claim 2, characterized in that: The gearbox hydraulic system also includes: a third oil circuit, the third oil circuit comprising a second pressure regulating valve, a fifth oil inlet of the second pressure regulating valve being in communication with the second oil outlet, the fifth oil outlet of the second pressure regulating valve being in communication with a first execution oil circuit, the first execution oil circuit being used to deliver oil to the first clutch; a fourth oil circuit, the fourth oil circuit comprising a third pressure regulating valve, a sixth oil inlet of the third pressure regulating valve being in communication with the second oil outlet, the sixth oil outlet of the third pressure regulating valve being in communication with a second actuating oil circuit, and the second actuating oil circuit being used to deliver oil to the second clutch; The control oil circuit further includes a second control valve and a third control valve, the second control valve is connected to the second oil outlet and the second pressure regulating valve, and the second control valve is used to selectively provide pilot oil to the second pressure regulating valve to connect or disconnect the fifth oil inlet and the fifth oil outlet; The third control valve is connected to the second oil outlet and the third pressure regulating valve, and the third control valve is used to selectively provide pilot oil to the third pressure regulating valve to connect or disconnect the sixth oil inlet and the sixth oil outlet.

4. The transmission hydraulic system according to claim 1, characterized in that: The cooling and lubricating oil circuit also includes an oil cooler, which has a seventh oil inlet and a seventh oil outlet that are connected. The first oil outlet is unidirectionally connected to the seventh oil inlet through the first one-way valve, and the second oil outlet is unidirectionally connected to the seventh oil inlet through the second one-way valve. The seventh oil outlet is used to provide oil to the motor, shaft teeth, and clutch.

5. The transmission hydraulic system according to claim 1, characterized in that: A filter is provided between the mechanical pump, the electronic pump and the oil storage tank.

6. The transmission hydraulic system according to claim 3, characterized in that: The first actuating oil circuit is provided with a first pressure sensor, and the first pressure sensor is used to test the pressure of the first actuating oil circuit; The second actuating oil circuit is provided with a second pressure sensor, and the second pressure sensor is used to test the pressure of the second actuating oil circuit.

7. An oil control method, characterized in that: The transmission hydraulic system according to any one of claims 1 to 6 adopts the oil control method, and the oil control method comprises: Determine the operating mode of the gearbox; If the gearbox is in pure electric mode, controlling the electronic pump to operate; If the transmission is in non-pure electric mode, the mechanical pump is controlled to operate and the motor temperature is obtained. If the motor temperature is greater than a preset temperature, the electronic pump is controlled to operate.

8. The oil control method according to claim 7, characterized in that: If the gearbox is in pure electric mode, the method further includes: Acquiring the temperature of the motor; If the motor temperature is greater than the preset temperature, the speed of the electronic pump is increased.

9. The oil control method according to claim 7, characterized in that: If the gearbox is in a non-pure electric mode, the method further includes: If the gearbox is in series mode, the first control valve is controlled to provide pressure oil to the first pressure regulating valve.

10. The oil control method according to claim 7, characterized in that: If the gearbox is in a non-pure electric mode, the method further includes: If the gearbox is in direct drive mode or parallel mode, controlling the first control valve to stop supplying pressurized oil to the first pressure regulating valve, and obtaining the vehicle speed or the accelerator pedal angle; According to the vehicle speed or the accelerator pedal angle, the second control valve is controlled to supply pilot oil to the second pressure regulating valve and the third control valve is controlled to stop supplying pilot oil to the third pressure regulating valve, or the second control valve is controlled to stop supplying pilot oil to the second pressure regulating valve and the third control valve is controlled to supply pilot oil to the third pressure regulating valve.

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