Electric drive axle system of vehicle, vehicle and control method

Abstract

The invention discloses an electric drive axle system of a vehicle, the vehicle and a control method, and relates to the field of vehicles, a transmission comprises a transmission shell, an oil storage pool is defined by the transmission shell, and a transmission device is arranged in the transmission shell; the mechanical pump and the electronic pump are both arranged on the transmission shell and both communicated with the oil storage pool, the first oil way is communicated with the electronic pump, the second oil way is communicated with the mechanical pump, and the first oil way and the second oil way are both configured to guide oil liquid to the transmission device. Therefore, the mechanical pump and the electronic pump are both communicated with the oil storage pool, the electronic pump pumps the oil liquid to the transmission device through the first oil way, the mechanical pump pumps the oil liquid to the transmission device through the second oil way, the flow of the lubricating and cooling oil liquid can be accurately controlled, and the lubricating and cooling efficiency is remarkably improved; and the lubricating and cooling effect of the other oil way cannot be affected when one of the first oil way and the second oil way breaks down, and the lubricating and cooling stability of the electric drive bridge system can be improved.

Description

Technical Field

[0001] This invention relates to the field of vehicles, and more particularly to an electric drive axle system, a vehicle, and a control method for a vehicle. Background Technology

[0002] With the development of new energy vehicles, the electric drive axle, as a highly integrated powertrain, is becoming increasingly important. The electric drive axle deeply integrates the drive motor, transmission, and axle differential, offering advantages such as compact structure and high transmission efficiency.

[0003] To ensure the reliable operation and long service life of key transmission components such as gears and bearings in the electric drive axle, a pressure lubrication system is crucial. In existing technologies, the lubrication structure design of the electric drive axle is unreasonable, resulting in low lubrication and cooling efficiency and poor stability. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one object of the present invention is to provide an electric drive bridge system that has high lubrication and cooling efficiency and high stability.

[0005] The present invention further proposes a vehicle.

[0006] The present invention further proposes a control method for an electric drive bridge system.

[0007] An electric drive axle system for a vehicle according to an embodiment of the present invention includes: a transmission, a transmission device, the transmission including a transmission housing defining an oil reservoir, the transmission device being disposed in the transmission housing; a mechanical pump, an electronic pump, a first oil passage, and a second oil passage, the mechanical pump and the electronic pump being disposed in the transmission housing and communicating with the oil reservoir, the first oil passage communicating with the electronic pump, the second oil passage communicating with the mechanical pump, and both the first oil passage and the second oil passage being configured to guide oil to the transmission device.

[0008] According to the electric drive axle system of the vehicle according to the present invention, by connecting both the mechanical pump and the electronic pump to the oil reservoir, and by having the electronic pump pump oil to the transmission device through the first oil circuit and the mechanical pump pump oil to the transmission device through the second oil circuit, the flow rate of the lubricating and cooling oil can be precisely controlled, significantly improving the lubrication and cooling efficiency. Furthermore, a failure in one of the first or second oil circuits will not affect the lubrication and cooling effect of the other oil circuit, which is beneficial to improving the stability of the lubrication and cooling of the electric drive axle system.

[0009] In some examples of the present invention, the electric drive axle system of the vehicle further includes a filter press disposed in the transmission housing, the first oil circuit including a first sub-oil circuit and a second sub-oil circuit, the second oil circuit including a third sub-oil circuit and a fourth sub-oil circuit, the filter press being connected between the first sub-oil circuit and the second sub-oil circuit, and also connected between the third sub-oil circuit and the fourth sub-oil circuit.

[0010] In some examples of the present invention, the electric drive axle system of the vehicle further includes: a first fuel injection pipe and a second fuel injection pipe, both of which are disposed in the transmission housing, the transmission housing having a first sub-oil passage and a second sub-oil passage, the first fuel injection pipe defining at least a portion of the second sub-oil passage, and the second fuel injection pipe defining at least a portion of the fourth sub-oil passage.

[0011] In some examples of the present invention, the transmission device includes: a one-axis transmission mechanism and a two-axis transmission mechanism, the one-axis transmission mechanism and the two-axis transmission mechanism being drively connected, the first fuel injection pipe defining a first fuel injection port toward the one-axis transmission mechanism, and the second fuel injection pipe defining a second fuel injection port toward the two-axis transmission mechanism.

[0012] In some examples of the present invention, the first fuel injection pipe passes through the single-shaft drive mechanism; and / or, the second fuel injection pipe passes through the dual-shaft drive mechanism.

[0013] In some examples of the present invention, the electric drive axle system of the vehicle further includes: a first one-way valve connected between the electric pump and the filter press, and configured to conduct unidirectionally from the electric pump to the filter press.

[0014] In some examples of the present invention, the electric drive axle system of the vehicle further includes a second one-way valve disposed between the mechanical pump and the filter press to allow unidirectional flow from the mechanical pump to the filter press.

[0015] In some examples of the present invention, the electric drive axle system of the vehicle further includes a filter, wherein the mechanical pump and the electronic pump are both connected to the filter, and the filter is disposed in the transmission housing and located in the oil reservoir.

[0016] According to the control method of the electric drive bridge system of the present invention, wherein the electric drive bridge system is the above-described electric drive bridge system, the control method includes: When the vehicle starts and the driving speed is 0km / h, the electronic pump is controlled to cycle into a first working state. The first working state includes: running at a first speed for a first preset time, and then running at a second speed for a second preset time. The first speed is greater than the second speed, and the first preset time is less than the second preset time. When the vehicle's speed increases from 0 km / h to less than or equal to a first preset speed, the electronic pump is controlled to enter a second working state, which includes: operating at a third speed. When the vehicle accelerates to a speed greater than the first preset speed, the electronic pump is controlled to stop working. When the vehicle slows down to a speed less than or equal to a second preset speed, the electronic pump is controlled to enter the second working state, where the second preset speed is not 0 km / h and is less than the first preset speed.

[0017] Therefore, by connecting both the mechanical pump and the electronic pump to the oil reservoir, and by having the electronic pump pump oil to the transmission device through the first oil circuit and the mechanical pump pump oil to the transmission device through the second oil circuit, the flow rate of the lubricating and cooling oil can be precisely controlled, significantly improving the lubrication and cooling efficiency. Furthermore, a failure in one of the first or second oil circuits will not affect the lubrication and cooling effect of the other oil circuit, which is beneficial to improving the stability of the lubrication and cooling of the electric drive bridge system.

[0018] According to the vehicle of the present invention, including the electric drive axle system of the vehicle of the above embodiment, by connecting both the mechanical pump and the electronic pump to the oil reservoir, and by having the electronic pump pump oil to the transmission device through the first oil circuit and the mechanical pump pump oil to the transmission device through the second oil circuit, the flow rate of the lubricating and cooling oil can be precisely controlled, significantly improving the lubrication and cooling efficiency. Furthermore, a failure in one of the first or second oil circuits will not affect the lubrication and cooling effect of the other oil circuit, which is beneficial to improving the stability of the lubrication and cooling of the electric drive axle system.

[0019] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the electric drive bridge system according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the transmission structure according to an embodiment of the present invention; Figure 3This is a structural schematic diagram of the transmission according to an embodiment of the present invention from another angle; Figure 4 This is an enlarged view of the transmission section structure according to an embodiment of the present invention; Figure 5 This is a diagram illustrating the architecture of the first oil circuit and the second oil circuit according to an embodiment of the present invention.

[0021] Figure label: Electric drive axle system 100; drive motor 99; differential 98; axle body 97; Transmission 10; Transmission housing 11; Oil reservoir 12; Transmission device 20; One-shaft transmission mechanism 21; Two-shaft transmission mechanism 22; Three-shaft transmission mechanism 23; Mechanical pump 30; electric pump 40; suction filter 41; filter press 42; first check valve 43; second check valve 44; bypass valve 45; First oil passage 50; First sub-oil passage 51; Second sub-oil passage 52; First connecting pipe 53; Second oil passage 60; Third sub-oil passage 61; Fourth sub-oil passage 62; Second connecting pipe 63; First fuel injector 71; second fuel injector 72; third fuel injector 73; fourth fuel injector 74. Detailed Implementation

[0022] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0023] The following is for reference. Figures 1-5 An electric drive axle system 100 for a vehicle according to an embodiment of the present invention is described.

[0024] like Figures 1-5 As shown, the electric drive axle system 100 according to an embodiment of the present invention includes: a transmission 10, a transmission device 20, a mechanical pump 30, an electronic pump 40, a first oil circuit 50, and a second oil circuit 60.

[0025] The transmission 10 includes a transmission housing 11, which defines an oil reservoir 12. The transmission device 20 is disposed in the transmission housing 11. The mechanical pump 30 and the electronic pump 40 are both disposed in the transmission housing 11 and are both connected to the oil reservoir 12. The first oil passage 50 is connected to the electronic pump 40, and the second oil passage 60 is connected to the mechanical pump 30. Both the first oil passage 50 and the second oil passage 60 are configured to guide oil to the transmission device 20.

[0026] As some embodiments of this application, the electric drive axle system 100 further includes: an axle body 97, a drive motor 99, and a differential 98, with the transmission 10, drive motor 99, and differential 98 all located on the axle body 97.

[0027] The transmission 10 includes a transmission housing 11, which defines an oil reservoir 12. A transmission device 20 is disposed in the transmission housing 11. As some embodiments of this application, at least a portion of the structure of the transmission device 20 is housed within the transmission housing 11. The transmission device 20 can transmit power from the engine and / or drive motor 99 to the wheel ends.

[0028] Both the mechanical pump 30 and the electronic pump 40 are located on the transmission housing 11. As some embodiments of this application, the mechanical pump 30 can be installed on the transmission housing 11 by means of bolt connection, snap-fit, etc. As some embodiments of this application, the electronic pump 40 can be installed on the transmission housing 11 by means of bolt connection, snap-fit, etc.

[0029] Both the mechanical pump 30 and the electronic pump 40 are connected to the oil storage tank 12. When the electronic pump 40 is working, it can pump the oil in the oil storage tank 12 into the first oil passage 50. Since the first oil passage 50 is configured to guide the oil to the transmission device 20, the oil sprayed from the first oil passage 50 can be directly sprayed onto the transmission device 20, which plays a role in lubrication and cooling. When the mechanical pump 30 is working, it can pump the oil in the oil storage tank 12 into the second oil passage 60. Since the second oil passage 60 is configured to guide the oil to the transmission device 20, the oil sprayed from the second oil passage 60 can be directly sprayed onto the transmission device 20, which plays a role in lubrication and cooling.

[0030] As some embodiments of this application, the electric drive axle system 100 is communicatively connected to the vehicle's speed sensor. When the vehicle speed is below 40 km / h, only the electronic pump 40 is activated to lubricate and cool the transmission device 20. When the vehicle speed exceeds 40 km / h, the mechanical pump 30 and the electronic pump 40 work simultaneously to lubricate and cool the transmission device 20. This can significantly improve the cooling and lubrication efficiency of the transmission 10.

[0031] As some embodiments of this application, oil is introduced at one end of the first oil passage 50, and multiple oil outlet holes are formed at the other end of the first oil passage 50. This arrangement allows oil to be sprayed toward multiple positions of the transmission device 20, which can achieve excellent lubrication and cooling effects.

[0032] As some embodiments of this application, oil is introduced into one end of the second oil passage 60, and multiple oil outlet holes are formed at the other end of the second oil passage 60. This arrangement allows oil to be sprayed toward multiple positions of the transmission device 20, which can achieve excellent lubrication and cooling effects.

[0033] It should be noted that by setting up a mechanical pump 30, an electronic pump 40, a first oil circuit 50, and a second oil circuit 60, this application can directly pump oil from the oil reservoir 12 to the transmission device 20, achieving excellent lubrication and cooling effects, and enabling the transmission 10 to have better transmission efficiency.

[0034] Furthermore, the first oil circuit 50 and the second oil circuit 60 of this application are independent oil circuits. If one of the oil circuits fails, it will not affect the lubrication and cooling effect of the other oil circuit, thereby greatly improving the stability of lubrication and cooling of the transmission 10. Moreover, by setting the first oil circuit 50 and the second oil circuit 60, the oil can be directly pumped to the transmission device 20, which can reduce the pressure loss of the oil and thus improve the lubrication effect.

[0035] It should be emphasized that the technical solution proposed in this application has the technical effect of splash lubrication, does not require the addition of oil circuits, and can reduce the burden on the lubrication system. Furthermore, the technical solution proposed in this application also has the technical effect of active lubrication. Active lubrication can be used in conjunction with splash lubrication to greatly improve the lubrication and cooling effect.

[0036] Therefore, by connecting both the mechanical pump 30 and the electronic pump 40 to the oil reservoir 12, and by having the electronic pump 40 pump oil to the transmission device 20 through the first oil circuit 50, and the mechanical pump 30 pump oil to the transmission device 20 through the second oil circuit 60, the flow rate of the lubricating and cooling oil can be precisely controlled, significantly improving the lubrication and cooling efficiency. Furthermore, if one of the oil circuits 50 and 60 fails, it will not affect the lubrication and cooling effect of the other oil circuit, which is beneficial to improving the stability of the lubrication and cooling of the electric drive bridge system 100.

[0037] In some embodiments of the present invention, such as Figures 3-5 As shown, the electric drive axle system 100 of the vehicle also includes: a filter press 42, which is disposed in the transmission housing 11; the first oil passage 50 includes: a first sub-oil passage 51 and a second sub-oil passage 52; the second oil passage 60 includes: a third sub-oil passage 61 and a fourth sub-oil passage 62; the filter press 42 is connected between the first sub-oil passage 51 and the second sub-oil passage 52, and is also connected between the third sub-oil passage 61 and the fourth sub-oil passage 62.

[0038] The filter press 42 is disposed on the transmission housing 11. As some embodiments of this application, the filter press 42 can be disposed on the transmission housing 11 by means of bolt connection, snap-fit, etc.

[0039] The first oil circuit 50 includes a first sub-oil circuit 51 and a second sub-oil circuit 52. The second oil circuit 60 includes a third sub-oil circuit 61 and a fourth sub-oil circuit 62. The filter press 42 is connected between the first sub-oil circuit 51 and the second sub-oil circuit 52, and the filter press 42 is also connected between the third sub-oil circuit 61 and the fourth sub-oil circuit 62. As some embodiments of this application, the electronic pump 40 can pump oil from the oil storage tank 12 into the first sub-oil circuit 51, through the filter press 42 into the second sub-oil circuit 52, and guide it to the transmission device 20. The mechanical pump 30 can pump oil from the oil storage tank 12 into the third sub-oil circuit 61, through the filter press 42 into the fourth sub-oil circuit 62, and guide it to the transmission device 20.

[0040] This configuration allows for thorough filtration of the oil pumped to the transmission device 20, reducing the risk of metal shavings, impurities, and particles in the oil entering the transmission device 20. Furthermore, it allows the first oil circuit 50 and the second oil circuit 60 to share a single filter press 42, avoiding the need to install a separate filter press 42 for each oil circuit, which simplifies the structure of the electric drive bridge system 100.

[0041] In some embodiments of the present invention, such as Figure 5 As shown, the electric drive axle system 100 of the vehicle also includes: a first fuel injection pipe 71 and a second fuel injection pipe 72. The first fuel injection pipe 71 and the second fuel injection pipe 72 are both disposed in the transmission housing 11. The transmission housing 11 forms a first sub-oil passage 51 and a second sub-oil passage 52. The first fuel injection pipe 71 defines at least a portion of the second sub-oil passage 52, and the second fuel injection pipe 72 defines at least a portion of the fourth sub-oil passage 62.

[0042] The first fuel injection pipe 71 and the second fuel injection pipe 72 are both located in the transmission housing 11. As some embodiments of this application, the first fuel injection pipe 71 is located in the transmission housing 11 by snap-fit. As some embodiments of this application, the second fuel injection pipe 72 is located in the transmission housing 11 by snap-fit.

[0043] The transmission housing 11 has a first sub-oil passage 51 and a second sub-oil passage 52, that is, the transmission housing 11 defines the first sub-oil passage 51 and the second sub-oil passage 52. The first fuel injector pipe 71 defines at least a portion of the second sub-oil passage 52, and the second fuel injector pipe 72 defines at least a portion of the fourth sub-oil passage 62. That is, the first fuel injector pipe 71 defines a portion of the second sub-oil passage 52, or the first fuel injector pipe 71 defines the entire second sub-oil passage 52, and the second fuel injector pipe 72 defines a portion of the fourth sub-oil passage 62, or the second fuel injector pipe 72 defines the entire fourth sub-oil passage 62.

[0044] As some embodiments of this application, the electric drive axle system 100 of the vehicle also includes a third fuel injection pipe 73 and a fourth fuel injection pipe 74. The first fuel injection pipe 71 and the third fuel injection pipe 73 define the entire second sub-fuel passage 52, and the second fuel injection pipe 72 and the fourth fuel injection pipe 74 define the entire fourth sub-fuel passage 62.

[0045] This configuration allows oil to be sprayed toward the transmission device 20 through the first oil injection pipe 71 and the second oil injection pipe 72, which helps to ensure that all parts of the transmission device 20 are adequately lubricated and cooled, thus improving the lubrication and cooling effects.

[0046] In some embodiments of the present invention, such as Figure 2 As shown, the transmission device 20 includes: a first-shaft transmission mechanism 21 and a second-shaft transmission mechanism 22. The first-shaft transmission mechanism 21 and the second-shaft transmission mechanism 22 are connected in a transmission manner. A first fuel injection pipe 71 defines a first fuel injection port toward the first-shaft transmission mechanism 21, and a second fuel injection pipe 72 defines a second fuel injection port toward the second-shaft transmission mechanism 22.

[0047] The first-shaft transmission mechanism 21 and the second-shaft transmission mechanism 22 can be connected by gear meshing. The engine and / or drive motor 99 can be connected to the first-shaft transmission mechanism 21. The power output by the engine and / or drive motor 99 can be transmitted to the second-shaft transmission mechanism 22 through the first-shaft transmission mechanism 21, and then transmitted to the wheel end directly or through other transmission mechanisms via the second-shaft transmission mechanism 22.

[0048] As some embodiments of this application, the first fuel injection pipe 71 defines a first fuel injection port, and there are multiple first fuel injection ports, all of which face the shaft transmission mechanism 21.

[0049] As some embodiments of this application, the second fuel injection pipe 72 defines a second fuel injection port, and there are multiple second fuel injection ports, all of which face the two-axis transmission mechanism 22.

[0050] As some embodiments of this application, the electric drive axle system 100 of the vehicle further includes: a first connecting pipe 53 and a second connecting pipe 63, both of which are disposed in the transmission housing 11. The first connecting pipe 53 defines at least a portion of the first sub-oil passage 51, and the second connecting pipe 63 defines at least a portion of the third sub-oil passage 61.

[0051] As a specific embodiment of this application, the gearbox housing is formed with a two-shaft bearing mounting groove. At least a portion of the bearing at one end of the two-shaft transmission mechanism 22 is disposed in the two-shaft bearing mounting groove. That is, a portion of the bearing at one end is disposed in the two-shaft bearing mounting groove, or the entire bearing at one end is disposed in the two-shaft bearing mounting groove. The second oil injection pipe 72 can spray oil into the two-shaft bearing mounting groove through the second oil injection port.

[0052] In some embodiments of this application, the central axis of the first fuel injection pipe 71 is collinear with the central axis of the single-shaft transmission mechanism 21. In some embodiments of this application, the central axis of the second fuel injection pipe 72 is collinear with the central axis of the dual-shaft transmission mechanism 22.

[0053] As some embodiments of this application, all components of the two-axis transmission mechanism 22 are provided with clearance holes, and multiple clearance holes are aligned with the central axis of the two-axis transmission mechanism 22. The second fuel injection pipe 72 can pass through multiple clearance holes so that the second fuel injection pipe 72 passes through the two-axis transmission mechanism 22.

[0054] This configuration allows oil to be sprayed onto the first shaft drive mechanism 21 and the second shaft drive mechanism 22 via the first and second oil spray ports, or onto multiple locations of the first and second shaft drive mechanisms 21 and 22, to achieve excellent lubrication and cooling effects.

[0055] In some embodiments of the present invention, the first fuel injection pipe 71 passes through a shaft transmission mechanism 21.

[0056] As some embodiments of this application, the first fuel injection pipe 71 defines a first fuel injection port, and there are multiple first fuel injection ports. The first fuel injection pipe 71 passes through a shaft transmission mechanism 21 to spray oil onto the shaft transmission mechanism 21 through multiple first fuel injection ports.

[0057] This configuration allows oil to be sprayed into the shaft drive mechanism 21 to achieve excellent and comprehensive lubrication and cooling effects.

[0058] In some embodiments of the present invention, the second fuel injection pipe 72 passes through the two-axis transmission mechanism 22.

[0059] As some embodiments of this application, the second fuel injection pipe 72 defines a second fuel injection port, and there are multiple second fuel injection ports. The second fuel injection pipe 72 passes through the two-axis transmission mechanism 22 to spray oil into the two-axis transmission mechanism 22 through multiple second fuel injection ports.

[0060] This configuration allows oil to be sprayed into the interior of the dual-shaft drive mechanism 22, achieving excellent and comprehensive lubrication and cooling effects.

[0061] In some embodiments of the present invention, such as Figure 4 and Figure 5 As shown, the electric drive axle system 100 of the vehicle also includes a first one-way valve 43, which is connected between the electric pump 40 and the filter press 42 and is configured to conduct unidirectionally from the electric pump 40 to the filter press 42.

[0062] In other words, a first check valve 43 is provided between the electronic pump 40 and the filter press 42, which enables the oil to flow unidirectionally from the electronic pump 40 to the filter press 42.

[0063] This configuration reduces the risk of oil flowing back from the filter press 42 to the electronic pump 40, reduces the risk of damage to the electronic pump 40, and helps to maintain the stability of the pressure in the first oil circuit 50.

[0064] In some embodiments of the present invention, such as Figure 4 and Figure 5 As shown, the electric drive axle system 100 of the vehicle also includes a second one-way valve 44, which is located between the mechanical pump 30 and the filter press 42 to allow unidirectional flow from the mechanical pump 30 to the filter press 42.

[0065] In other words, a second check valve 44 is provided between the mechanical pump 30 and the filter press 42, which allows the oil to flow unidirectionally from the mechanical pump 30 to the filter press 42.

[0066] This configuration reduces the risk of oil flowing back from the filter press 42 to the mechanical pump 30, reduces the risk of damage to the mechanical pump 30, and helps to maintain the stability of the pressure in the second oil circuit 60.

[0067] In some embodiments of the present invention, such as Figure 4 and Figure 5 As shown, the electric drive axle system 100 of the vehicle also includes: a suction filter 41, a mechanical pump 30 and an electronic pump 40, both of which are connected to the suction filter 41, and the suction filter 41 is located in the transmission housing 11 and in the oil reservoir 12.

[0068] As some embodiments of this application, the suction filter 41 is connected to the transmission housing 11 by bolts, and the suction filter 41 is immersed in the oil in the oil reservoir 12. This can reduce the risk of cavitation caused by the oil reservoir 12 being exposed to air, thereby effectively reducing the risk of cavitation damage and lubrication interruption of the mechanical pump 30 and the electronic pump 40.

[0069] As some embodiments of this application, the electric drive axle system 100 of the vehicle also includes a bypass valve 45, which is disposed on the filter 41 to reduce the risk of the filter 41 becoming clogged and unable to supply oil.

[0070] By connecting both the mechanical pump 30 and the electric pump 40 to the suction filter 41, the mechanical pump 30 and the electric pump 40 can share a single suction filter 41, providing a unified and clean oil source for the mechanical pump 30 and the electric pump 40. This greatly reduces the difficulty of layout, lowers costs, and helps improve the reliability of the electric drive bridge system 100.

[0071] As some embodiments of this application, such as Figure 2 As shown, the transmission device 20 includes: a single-axis transmission mechanism 21, a two-axis transmission mechanism 22, and a three-axis transmission mechanism 23. The two-axis transmission mechanism 22 is connected between the single-axis transmission mechanism 21 and the three-axis transmission mechanism 23, and the three-axis transmission mechanism 23 is connected to the mechanical pump 30.

[0072] As some embodiments of this application, the first-axis transmission mechanism 21 and the second-axis transmission mechanism 22 can be connected by gear meshing, and the second-axis transmission mechanism 22 and the third-axis transmission mechanism 23 can be connected by gear meshing. The power output by the engine and / or drive motor 99 can be transmitted from the first-axis transmission mechanism 21 to the second-axis transmission mechanism 22, and then from the second-axis transmission mechanism 22 to the third-axis transmission mechanism 23, and then directly or through other transmission mechanisms to the wheel end.

[0073] The three-axis transmission mechanism 23 is connected to the mechanical pump 30. In other words, the force for pumping oil by the mechanical pump 30 can be provided by the three-axis transmission mechanism 23, or the force for pumping oil by the mechanical pump 30 can be provided by the engine or drive motor 99. This configuration can save on the number of motors used and reduce costs.

[0074] As some embodiments of this application, the mechanical pump 30 includes: a housing (not shown in the figure) and a rotor (not shown in the figure). The housing is disposed in the gearbox housing 11, and the rotor is movably disposed inside the housing and is connected to the three-axis transmission mechanism 23 for transmission.

[0075] The outer casing can be installed on the gearbox housing 11 by means of bolt connection, snap-fit, welding, etc., and the rotor can be installed on the outer casing by rotation.

[0076] The rotor and the three-axis transmission mechanism 23 can be connected by means of transmission, but not limited to splines, couplings, etc. The pressure difference generated after the rotor rotates can pump the oil from the oil storage tank 12 into the second oil circuit 60.

[0077] This configuration allows the mechanical pump 30 to be driven by the three-axis transmission mechanism 23, so that the oil is pumped from the oil reservoir 12 into the second oil circuit 60 under the action of pressure difference, which is beneficial to improving the lubrication effect.

[0078] According to an embodiment of the present invention, the electric drive axle system 100 of the vehicle described above, by connecting both the mechanical pump 30 and the electronic pump 40 to the oil reservoir 12, and by having the electronic pump 40 pump oil to the transmission device 20 through the first oil passage 50, and the mechanical pump 30 pump oil to the transmission device 20 through the second oil passage 60, the flow rate of the lubricating and cooling oil can be precisely controlled, significantly improving the lubrication and cooling efficiency. Furthermore, a failure in one of the oil passages, the first oil passage 50 and the second oil passage 60, will not affect the lubrication and cooling effect of the other oil passage, which is beneficial to improving the stability of the lubrication and cooling of the electric drive axle system 100.

[0079] According to an embodiment of the present invention, a control method for an electric drive bridge system, wherein the electric drive bridge system is the aforementioned electric drive bridge system, the control method includes: S1, the vehicle starts and the driving speed is 0km / h, and the electronic pump is controlled to cycle into the first working state. The first working state includes: running at a first speed for a first preset time, and then running at a second speed for a second preset time, where the first speed is greater than the second speed and the first preset time is less than the second preset time. As some embodiments of this application, the electric drive axle system is communicatively connected to the vehicle controller, and the vehicle speed sensor is communicatively connected to the vehicle controller. The vehicle speed sensor can transmit vehicle speed data to the vehicle controller, and the vehicle controller can control the electric pump of the electric drive axle system to cycle into the first working state.

[0080] As some embodiments of this application, the first speed of the electronic pump is 2700 rpm, the first preset time is 2s, the second speed is 1200 rpm, the second preset time is 6s. When the vehicle starts and the driving speed is 0 km / h, the electronic pump starts and enters the first working state. In the first working state, the electronic pump runs at 2700 rpm for 2s, then runs at 1200 rpm for 6s, and cycles for 8s.

[0081] This configuration allows the electric pump to pump oil from the oil reservoir at high power within a short initial preset time, quickly applying it to the transmission device and establishing the required base oil pressure. Subsequently, only a lower power is needed to maintain the lubrication and cooling requirements, which can significantly improve the efficiency of lubrication and cooling, and save energy and reduce consumption.

[0082] S2, the vehicle's speed increases from 0 km / h to less than or equal to the first preset speed, and the electronic pump is controlled to enter the second working state, which includes: running at the third speed; As some embodiments of this application, the first preset speed is 40 km / h, and the third speed is the same as the first speed, which is 2700 rpm. During the process of the vehicle speed increasing from 0 km / h to any speed less than or equal to 40 km / h, the electronic pump starts and enters the second working state. In the second working state, the electronic pump runs continuously at a speed of 2700 rpm.

[0083] This configuration ensures sufficient lubrication and cooling for the vehicle under low-speed, high-load conditions (such as starting, climbing, and frequent start-stop in urban environments), provides stable and continuous lubrication pressure for the electric drive axle system, and ensures that the oil can overcome resistance and reach all parts that need lubrication in a timely manner, which is beneficial to improving the lubrication effect of the electric drive axle system.

[0084] S3, when the vehicle accelerates to a speed greater than the first preset speed, the electronic pump stops working; As some embodiments of this application, the first preset speed is 40 km / h, and the electronic pump stops working when the vehicle speed is greater than 40 km / h.

[0085] When the vehicle speed exceeds the first preset speed, the electric drive axle system can be fully lubricated and cooled by the mechanical pump alone. The electric pump stops working, which reduces the power consumption of the electric pump, thereby saving energy and improving the lubrication and cooling efficiency of the electric drive axle system.

[0086] S4, the vehicle speed decreases to a speed less than or equal to the second preset speed, and the electronic pump is controlled to enter the second working state, where the second preset speed is not 0 km / h and is less than the first preset speed.

[0087] The second preset speed is not 0 km / h and is less than the first preset speed, that is, the second preset speed can be any value between 0 km / h and 40 km / h.

[0088] As some embodiments of this application, the first preset speed is 40 km / h, the second preset speed is 37 km / h, and when the vehicle speed drops from greater than 40 km / h to less than or equal to 37 km / h, the vehicle controller controls the electronic pump to enter the second working state, that is, to run at the third speed.

[0089] This setting allows the electric pump to enter a second working state when the vehicle speed drops below the second preset speed, thereby reducing the risk of damage caused by frequent starting and stopping of the electric pump, extending the service life of the electric pump, and helping to maintain the stability of the pressure in the electric drive axle system.

[0090] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0091] In the description of this invention, "first feature" and "second feature" may include one or more of the features.

[0092] In the description of this invention, "a plurality of" means two or more.

[0093] In the description of this invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0094] In the description of this invention, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.

[0095] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0096] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An electric drive axle system (100) for a vehicle, characterized in that, include: The transmission (10) includes a transmission housing (11) defining an oil reservoir (12) and the transmission (20) is disposed in the transmission housing (11). The system includes a mechanical pump (30), an electronic pump (40), a first oil passage (50), and a second oil passage (60). The mechanical pump (30) and the electronic pump (40) are both located in the transmission housing (11) and are connected to the oil reservoir (12). The first oil passage (50) is connected to the electronic pump (40), and the second oil passage (60) is connected to the mechanical pump (30). Both the first oil passage (50) and the second oil passage (60) are configured to guide oil to the transmission device (20).

2. The electric drive axle system (100) of the vehicle according to claim 1, characterized in that, Also includes: A filter press (42) is disposed in the transmission housing (11). The first oil passage (50) includes a first sub-oil passage (51) and a second sub-oil passage (52). The second oil passage (60) includes a third sub-oil passage (61) and a fourth sub-oil passage (62). The filter press (42) is connected between the first sub-oil passage (51) and the second sub-oil passage (52), and is also connected between the third sub-oil passage (61) and the fourth sub-oil passage (62).

3. The electric drive axle system (100) of the vehicle according to claim 2, characterized in that, Also includes: A first fuel injection pipe (71) and a second fuel injection pipe (72) are both disposed in the transmission housing (11). The transmission housing (11) forms a first sub-oil passage (51) and a second sub-oil passage (52). The first fuel injection pipe (71) defines at least a portion of the second sub-oil passage (52), and the second fuel injection pipe (72) defines at least a portion of the fourth sub-oil passage (62).

4. The electric drive axle system (100) of the vehicle according to claim 3, characterized in that, The transmission device (20) includes: a one-axis transmission mechanism (21) and a two-axis transmission mechanism (22), wherein the one-axis transmission mechanism (21) and the two-axis transmission mechanism (22) are connected in transmission, the first fuel injection pipe (71) defines a first fuel injection port toward the one-axis transmission mechanism (21), and the second fuel injection pipe (72) defines a second fuel injection port toward the two-axis transmission mechanism (22).

5. The electric drive axle system (100) of the vehicle according to claim 4, characterized in that, The first fuel injection pipe (71) passes through the shaft transmission mechanism (21). And / or, the second fuel injection pipe (72) passes through the dual-shaft transmission mechanism (22).

6. The electric drive axle system (100) for a vehicle according to claim 2, characterized in that, Also includes: A first check valve (43) is connected between the electronic pump (40) and the filter press (42) and is configured to conduct unidirectionally from the electronic pump (40) to the filter press (42).

7. The electric drive axle system (100) for a vehicle according to claim 6, characterized in that, Also includes: A second check valve (44) is provided between the mechanical pump (30) and the filter press (42) to allow unidirectional flow from the mechanical pump (30) to the filter press (42).

8. The electric drive axle system (100) of the vehicle according to claim 1, characterized in that, Also includes: The suction filter (41), the mechanical pump (30) and the electronic pump (40) are all connected to the suction filter (41), and the suction filter (41) is located in the transmission housing (11) and in the oil reservoir (12).

9. A control method for an electric drive bridge system (100), characterized in that, The electric drive axle system (100) includes the electric drive axle system (100) of the vehicle according to any one of claims 1-8, and the control method includes: The vehicle is started and the driving speed is 0km / h. The electronic pump (40) is controlled to cycle into a first working state. The first working state includes: running at a first speed for a first preset time, and then running at a second speed for a second preset time. The first speed is greater than the second speed, and the first preset time is less than the second preset time. The vehicle's speed increases from 0 km / h to less than or equal to a first preset speed, and the electronic pump (40) is controlled to enter a second working state, the second working state including: running at a third speed; When the vehicle accelerates to a speed greater than the first preset speed, the electronic pump (40) is controlled to stop working; When the vehicle slows down to a speed less than or equal to a second preset speed, the electronic pump (40) is controlled to enter a second working state, where the second preset speed is not 0 km / h and is less than the first preset speed.

10. A vehicle, characterized in that, The electric drive axle system (100) of the vehicle according to any one of claims 1-9.

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