Hydraulic system, transmission and vehicle

Abstract

The utility model discloses a hydraulic system, a transmission and a vehicle. The hydraulic system comprises an oil storage part, an electronic pump and a parking oil way. The electronic pump is connected with the oil storage part. The parking oil way is suitable for being connected with the electronic pump and the parking mechanism, and the parking mechanism is configured to provide first oil pressure for the electronic pump to pump oil from the oil storage piece so as to unlock the parking mechanism. According to the hydraulic system in the embodiment, the first oil pressure can be provided for the parking mechanism through the electronic pump to unlock the parking mechanism, and the energy consumption of the hybrid vehicle is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic systems, and more particularly to a hydraulic system, a transmission and a vehicle. BACKGROUND

[0002] The transmission hydraulic system of the hybrid vehicle includes an electronic pump and a mechanical pump, the oil suction circuits of the mechanical pump and the electronic pump are independently separated, which meets the normal driving, parking and reversing functions of the hybrid vehicle, but the mechanical pump provides the main oil pressure. Therefore, when starting the hybrid vehicle, the engine needs to be started to start the mechanical pump, and the mechanical pump provides oil pressure for the parking mechanism to unlock the parking mechanism. In this way, even if the hybrid vehicle works in pure electric mode, when starting the hybrid vehicle, the engine needs to be started specially to start the mechanical pump, which increases energy consumption. SUMMARY

[0003] The present application provides a hydraulic system, a transmission and a vehicle.

[0004] The hydraulic system of the present application comprises:

[0005] an oil storage member;

[0006] an electronic pump connected to the oil storage member;

[0007] a parking oil circuit adapted to connect the electronic pump and a parking mechanism, the parking mechanism being configured to be pumped by the electronic pump from the oil storage member to provide a first oil pressure to unlock the parking mechanism.

[0008] In some embodiments, the parking oil circuit further comprises an accumulator connected between the parking mechanism and the electronic pump, the accumulator being used to store oil with the first oil pressure.

[0009] In some embodiments, the parking mechanism comprises a hydraulic cylinder and a hydraulic rod, the hydraulic rod having a locked position and an unlocked position, and the electronic pump is used to provide the first oil pressure to the hydraulic cylinder to drive the hydraulic rod to move from the locked position to the unlocked position.

[0010] In some embodiments, the parking mechanism is provided with a position sensor for identifying the position of the hydraulic rod.

[0011] In some embodiments, the parking mechanism further comprises an actuating mechanism and a locking pin, and the hydraulic rod is provided with a first clamping groove and a second clamping groove, the actuating mechanism drives the locking pin to cooperate with the first clamping groove when the hydraulic rod is in the unlocked position, and / or the actuating mechanism drives the locking pin to cooperate with the second clamping groove when the hydraulic rod is in the locked position.

[0012] In some embodiments, the parking oil line further comprises a first solenoid valve, the first solenoid valve comprising a first passage and a second passage, the first passage connecting the parking mechanism and the electric pump, the second passage connecting the parking mechanism and the oil reservoir.

[0013] In some embodiments, the hydraulic system further comprises a first cooling lubrication oil line, the first cooling lubrication oil line adapted to connect the electric pump and a power transmission assembly.

[0014] In some embodiments, the first cooling lubrication oil line further comprises an oil cooler disposed between the electric pump and the power transmission assembly.

[0015] In some embodiments, the first cooling lubrication oil line further comprises a first filter disposed between the oil cooler and the power transmission assembly.

[0016] In some embodiments, the first cooling lubrication oil line further comprises a bypass valve disposed between the electric pump and the power transmission assembly, the bypass valve configured to connect the electric pump and the power transmission assembly when a differential oil pressure across the oil cooler and / or the first filter is greater than a first preset value.

[0017] In some embodiments, the first cooling lubrication oil line comprises a first check valve disposed between the electric pump and the power transmission assembly, the first check valve configured to restrict oil flow back from the power transmission assembly.

[0018] In some embodiments, the hydraulic system further comprises a second solenoid valve, the second solenoid valve comprising a third passage and a fourth passage that can be opened alternatively; the third passage connecting the electric pump and the parking mechanism, the fourth passage connecting the electric pump and the power transmission assembly.

[0019] In some embodiments, the hydraulic system further comprises a second filter disposed between the second solenoid valve and the electric pump.

[0020] In some embodiments, the hydraulic system further comprises:

[0021] a mechanical pump;

[0022] a second cooling lubrication oil line of the oil reservoir, the second cooling lubrication oil line connecting the mechanical pump and the power transmission assembly.

[0023] In some embodiments, the second cooling lubrication oil line comprises a second check valve disposed between the mechanical pump and the power transmission assembly.

[0024] In some embodiments, the second cooling lubricating oil circuit further comprises an oil cooler disposed between the mechanical pump and the power transmission assembly.

[0025] In some embodiments, the second cooling lubricating oil circuit further comprises a first filter disposed between the oil cooler and the power transmission assembly.

[0026] In some embodiments, the hydraulic system further comprises:

[0027] a mechanical pump;

[0028] a high pressure oil circuit adapted to communicate the mechanical pump and a coupling; the mechanical pump is configured to provide a second oil pressure to the coupling.

[0029] In some embodiments, the high pressure oil circuit comprises a third solenoid valve, the mechanical pump is connected to the coupling through the third solenoid valve.

[0030] In some embodiments, the hydraulic system comprises a plurality of the high pressure oil circuits.

[0031] In some embodiments, the hydraulic system further comprises:

[0032] a control oil circuit configured to control a flow rate of the power transmission assembly.

[0033] In some embodiments, the hydraulic system further comprises a flow valve disposed on the power transmission assembly, the flow valve comprises a third control end, the control oil circuit is connected to the third control end, the third control end is configured to control an opening degree of the flow valve by communicating the control oil circuit.

[0034] In some embodiments, the control oil circuit comprises a fourth solenoid valve, the mechanical pump is connected to the power transmission assembly through the fourth solenoid valve.

[0035] In some embodiments, the hydraulic system further comprises a spool valve disposed between the coupling and the mechanical pump, the spool valve comprises a fifth passage, a first control end and a second control end, the fourth solenoid valve is connected to the first control end, the fifth passage is connected to the coupling and the mechanical pump; one end of the fourth solenoid valve is connected to the first control end, and the other end is connected to an output end of the mechanical pump; the second control end is connected to the output end of the mechanical pump.

[0036] In some embodiments, the spool valve further comprises a sixth passage, the sixth passage is connected to the fifth passage and the oil storage; the spool valve is configured to open the sixth passage when the oil pressure of the second control end is higher than a second preset value.

[0037] In some embodiments, the hydraulic system further comprises a pressure relief valve in communication with the fifth passage.

[0038] In some embodiments, the hydraulic system further comprises a controller configured to, in the pure electric mode and upon receiving an unlock signal of the parking mechanism, control the electronic pump to provide a first oil pressure to the parking mechanism to unlock the parking mechanism.

[0039] The transmission of the embodiments of the present application comprises the above-mentioned hydraulic system.

[0040] The vehicle of the embodiments of the present application comprises the above-mentioned hydraulic system or the above-mentioned transmission.

[0041] In the hydraulic system, the transmission and the vehicle of the embodiments of the present application, the electronic pump is used to provide the first oil pressure to the parking mechanism to unlock the parking mechanism, so that the mechanical pump can be started without starting the engine, and the energy waste during the starting of the engine is avoided, thereby reducing the energy consumption of the hybrid vehicle.

[0042] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0043] The above-mentioned and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings in which:

[0044] Figure 1 is a schematic diagram of an oil circuit of the hydraulic system of some embodiments of the present application;

[0045] Figure 2 is an enlarged view of part A in Figure 1

[0046] Figure 3 is a schematic diagram of a vehicle of some embodiments of the present application;

[0047] Figure 4 is a structural block diagram of a transmission of some embodiments of the present application.

[0048] Explanation of main element symbols:

[0049] Vehicle 10000;

[0050] Hydraulic system 1000;

[0051] Electronic pump 10;

[0052] First electromagnetic valve 20;

[0053] Energy accumulator 30;​

[0054] Second electromagnetic valve 40;

[0055] First check valve 50;

[0056] Oil cooler 60;

[0057] First filter 70;

[0058] Bypass valve 80;

[0059] Second filter 90;

[0060] Mechanical pump 100;

[0061] Third electromagnetic valve 110;

[0062] Spool valve 120; first control end 121; second control end 122;

[0063] Fourth electromagnetic valve 130;

[0064] Second check valve 140;

[0065] Pressure relief valve 150;

[0066] Flow valve 160; third control end 161;

[0067] Power transmission assembly 210;

[0068] Oil storage member 220;

[0069] Parking mechanism 230;

[0070] Hydraulic cylinder 231;

[0071] Hydraulic rod 232; first clamping groove 2321; second clamping groove 2322;

[0072] Position sensor 240;

[0073] Actuator 250;

[0074] Cannula 260;

[0075] Coupler 270;

[0076] Controller 280;

[0077] Transmission 2000;

[0078] Engine 3000;

[0079] Drive motor 4000;

[0080] Generator 5000. DETAILED DESCRIPTION

[0081] In order to make the above objectives, characteristics and advantages of the present application more apparent, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It is apparent, however, to one skilled in the art, that the present application can be practiced without using these specific details in other ways, and the present application is not limited to the specific embodiments disclosed below.

[0082] In the description of the present application, it should be understood that the terms "center", "length", "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0083] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0084] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0085] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0086] The embodiments of the present application provide a hydraulic system, a transmission and a vehicle.

[0087] The vehicle of the embodiments of the present application includes the hydraulic system described above or the transmission described above.

[0088] The hydraulic system 1000 of the embodiments of the present application includes an oil reservoir 220, an electric pump 10 connected to the oil reservoir 220, and a parking oil circuit adapted to connect the electric pump 10 and a parking mechanism 230 configured to be provided with a first oil pressure by the electric pump 10 to unlock the parking mechanism 230.

[0089] The hydraulic system 1000 of the embodiments of the present application is used in a power system including a parking mechanism 230, and includes an oil reservoir and an electric pump 10 connected to the oil reservoir 220 and the parking mechanism 230, and the parking mechanism is adapted to be provided with a first oil pressure by the electric pump to unlock the parking mechanism.

[0090] The vehicle of the embodiments of the present application can be a vehicle using a power system as a power system of the vehicle, and the power system can include an engine and an electric motor, wherein the engine can be an engine using gasoline, diesel or hydrogen as a fuel. The electric motor can have the ability to directly drive the vehicle, the ability to generate electricity under the drive of the engine and / or the ability to start the engine. The power system can further include a battery having the ability to drive a high-power electrical appliance, for example, the battery can at least drive the electric pump.

[0091] The transmission of the embodiments of the present application includes the hydraulic system described above.

[0092] The transmission can be a dedicated transmission of a hybrid vehicle, for example, an Electronically-Controlled Continuously Variable Transmission (E-CVT). Some hybrid vehicles do not use a dedicated transmission, but use a general transmission, for example, an Automatic Transmission (AT), a Double-Clutch Transmission or a Continuously Variable Transmission (CVT). Therefore, the transmission of the embodiments of the present application can also be a transmission of the above type.

[0093] Please refer to Figure 1 , Figure 3 and Figure 4The hydraulic system of the embodiments of the present application is used in a power system, the power system includes an oil storage member 220 and a parking mechanism 230, and the hydraulic system 1000 includes an electric pump 10 and a controller 280. The electric pump 10 is connected to the oil storage member 220 and the parking mechanism 230. The controller 280 is configured to control the electric pump 10 to provide a first oil pressure to the parking mechanism 230 to unlock the parking mechanism 230 when the power system is in an electric-only mode and an unlock signal of the parking mechanism 230 is received.

[0094] The parking mechanism 230 is a mechanical mechanism for locking the wheels, which can be a mechanism for locking the output shaft of the transmission 2000 so that the output shaft of the transmission 2000 cannot rotate, thereby preventing the driving wheels from rotating and avoiding the movement of the vehicle 10000 in the parking state. The parking mechanism 230 can also be a mechanism on the brake caliper, which prevents the wheels from rotating by clamping the brake disc with the brake caliper, thereby directly preventing the vehicle 10000 from sliding. The action of locking the wheels by the parking mechanism 230 is driven by the hydraulic system.

[0095] The electric pump 10 can be a centrifugal electric pump 10, a piston electric pump 10, or a roller electric pump 10. The electric pump 10 can include an electric motor driven by a battery to start pumping oil.

[0096] The vehicle 10000 using the power system can work in an electric-only mode, in which the engine 3000 does not work, and at least one electric motor drives the vehicle 10000 to move. For example, when the power battery of the vehicle 10000 has a power above a preset value (for example, 85% or 90%), and the engine 3000 is not needed to drive the generator 5000 to charge the battery, the engine 3000 can be disabled, and only the electric motor drives the vehicle 10000 to move. At this time, if the engine 3000 is started to unlock the parking mechanism 230 of the vehicle 10000, the energy for starting the engine 3000 needs to be provided, which can be provided by the power battery or other batteries of the vehicle 10000, but regardless of which battery provides the energy, a large amount of energy needs to be consumed, causing energy waste. At this time, the electric energy generated by the generator 5000 due to rotation cannot be recovered because the power battery needs to be protected from overcharging, further causing energy waste.

[0097] Therefore, when the vehicle 10000 works in an electric-only mode, when the controller 280 receives an unlock instruction from the driver, driving the electric pump 10 to provide a first oil pressure to the parking mechanism 230 to unlock the parking mechanism 230 can avoid energy waste caused by starting the engine 3000, and improve the energy consumption of the hybrid vehicle.

[0098] The driver's unlock instruction can be issued through a gear shift, for example, when the driver switches from the parking gear (P) to the drive gear (D) or the neutral gear (N), the VCU receives the gear shift signal, thereby starting the electronic pump 10 to unlock the parking mechanism 230.

[0099] The first oil pressure is not a fixed value, but an oil pressure sufficient to drive the parking mechanism 230. For example, when rapid unlocking is required, the first oil pressure can be high, and when only slow unlocking is required, the first oil pressure can be low. Meanwhile, the first oil pressure can also change during a driving process. In one example, please refer to Figure 2 When the piston rod starts to move, the first oil pressure can be high, so that the piston rod starts to move quickly; when the piston rod moves to the middle position, the oil pressure can be reduced, so that the piston rod moves under the action of inertia and saves energy; when the piston rod moves close to the final position, the oil pressure can be increased, because Figure 2 In the embodiment shown, the force of the piston rod returning to the locking position is provided by the spring, and the resistance of the spring before compression to the final state is large, and the increase of the oil pressure can overcome the elastic force.

[0100] In some embodiments, the hydraulic system 1000 further comprises a controller 280 configured to, in the pure electric mode and in the case of receiving an unlock signal of the parking mechanism 230, control the electronic pump 10 to provide the first oil pressure to the parking mechanism 230 to unlock the parking mechanism 230.

[0101] The controller 280 controls the electronic pump 10 to provide the first oil pressure to the parking mechanism 230 to unlock the parking mechanism 230. The electronic pump 10 can be directly driven by the battery of the vehicle 10000, without the need to be driven by the engine 3000. While the mechanical pump 100 generally needs to be driven by the timing side transmission wheel of the engine 3000, which is a belt wheel or gear wheel linked with the crankshaft of the engine 3000, so that the mechanical pump 100 needs to be started by starting the engine 3000. Since the electronic pump 10 is used to provide the first oil pressure, the mechanical pump 100 can be started without the need to specially start the engine 3000, avoiding the waste of energy when the engine 3000 is started, thereby reducing the energy consumption of the hybrid vehicle.

[0102] The controller 280 can be at least one of an engine control unit (ECU), a transmission control unit (TCU), and a vehicle control unit (VCU), so as to receive the driver's instruction and control the action of the hydraulic system according to the instruction. In Figure 4 In the embodiment shown, the control is the TCU, so it is arranged on the transmission 2000.

[0103] In some embodiments, the parking oil circuit further comprises an accumulator 30 connected between the parking mechanism 230 and the electronic pump 10, the accumulator 30 is configured to store oil with the first oil pressure.

[0104] The accumulator 30 stores oil with pressure, so that when the electronic pump 10 starts, it can assist the electronic pump 10 to quickly establish oil pressure, so as to improve the response speed of the hydraulic system 1000, and at the same time reduce the working strength of the electronic pump 10. The accumulator 30 can also release pressure when the electronic pump 10 is insufficient in power to meet the oil pressure strength required by the parking mechanism 230.

[0105] In some embodiments, the accumulator 30 can be a spring accumulator.

[0106] In some embodiments, the accumulator 30 comprises a gas bag accumulator.

[0107] The gas bag accumulator has small gas bag inertia and sensitive response, which helps to improve the response speed of the hydraulic system 1000.

[0108] In some embodiments, the parking mechanism 230 comprises a hydraulic cylinder 231 and a hydraulic rod 232; the hydraulic rod 232 has a locking position and an unlocking position, and the electronic pump 10 is configured to provide the first oil pressure to the hydraulic cylinder 231 to drive the hydraulic rod 232 to move from the locking position to the unlocking position.

[0109] In some embodiments, the parking mechanism 230 is provided with a position sensor 240, the position sensor 240 is configured to identify the position of the hydraulic rod 232.

[0110] In some embodiments, the hydraulic system 1000 further comprises a parking mechanism 230 and a position sensor 240, the parking mechanism 230 comprises a hydraulic cylinder 231 and a hydraulic rod 232; the hydraulic rod 232 has a locking position and an unlocking position, and the electronic pump 10 is configured to provide the first oil pressure to the hydraulic cylinder 231 to drive the hydraulic rod 232 to move from the locking position to the unlocking position.

[0111] The controller 280 is configured to identify the locking position or the unlocking position of the hydraulic rod 232 through the position sensor 240.

[0112] The position sensor 240 can determine the position information of the hydraulic rod 232, so that the control of the controller 280 on the hydraulic rod 232 can form a closed loop control, and the control accuracy of the hydraulic rod 232 is improved.

[0113] In one example, when the driver needs the hydraulic rod 232 to be in the unlocked position so that the vehicle 10000 can move or travel, but the position sensor 240 determines that the hydraulic rod 232 is not in the unlocked position, the controller 280 can adjust the first oil pressure to change the position of the hydraulic rod 232 so that the hydraulic rod 232 is finally moved to the unlocked position.

[0114] When the hydraulic rod 232 is in the locked position, the parking mechanism 230 is in the locked state, i.e., locking at least one wheel of the vehicle 10000 to prevent the vehicle 10000 from moving. When the hydraulic rod 232 is in the unlocked position, the parking mechanism 230 is in the unlocked state, and the vehicle 10000 can start to move under the drive of the power system or under the push of external force.

[0115] In some embodiments, the parking mechanism 230 further comprises an actuator 250 and a latch 260, and the hydraulic rod 232 is provided with a first clamping groove 2321 and a second clamping groove 2322, the actuator 250 drives the latch 260 to cooperate with the first clamping groove 2321 when the hydraulic rod 232 is in the unlocked position, and / or the actuator 250 drives the latch 260 to cooperate with the second clamping groove 2322 when the hydraulic rod 232 is in the locked position.

[0116] Please refer to Figure 2 In some embodiments, the controller 280 is configured to control the actuator 250 to drive the latch 260 to cooperate with the first clamping groove 2321 when the hydraulic rod 232 is in the unlocked position, and / or control the actuator 250 to drive the latch 260 to cooperate with the second clamping groove 2322 when the hydraulic rod 232 is in the locked position.

[0117] The cooperation of the latch 260 and the first clamping groove 2321 can make the hydraulic rod 232 stably in the unlocked position, avoiding the hydraulic rod 232 from being accidentally moved to be locked; the cooperation of the latch 260 and the second clamping groove 2322 can make the hydraulic rod 232 stably in the locked position, avoiding the hydraulic rod 232 from being accidentally moved to be unlocked. Therefore, the damage of the parking mechanism 230 due to accidental locking or the vehicle 10000 from rolling due to accidental unlocking can be avoided, and the safety can be improved.

[0118] In Figure 1 In the embodiment shown, the actuator 250 is a proportional electromagnet, and in other embodiments, the actuator 250 can also be a linear motor.

[0119] Please refer to Figure 1 The electronic pump 10 and the mechanical pump 100 can also share an oil inlet oil path, and share an oil suction filter on the oil path to filter impurities in the oil.

[0120] In some embodiments, the parking oil circuit further comprises a first electromagnetic valve 20, the first electromagnetic valve 20 comprising a first passage and a second passage, the first passage connecting the parking mechanism 230 and the electronic pump 10, and the second passage connecting the parking mechanism 230 and the oil storage 220.

[0121] The oil storage 220 can be an oil storage 220 of the transmission 2000, or an oil storage 220 of the engine 3000, or an independent tank for collecting oil in the hydraulic system 1000.

[0122] Please refer to Figure 1 In some embodiments, the controller 280 is configured to, in the case of receiving an unlocking signal, control the first electromagnetic valve 20 to open the first passage to unlock the parking mechanism 230, or in the case of receiving a locking signal of the parking mechanism 230, control the oil in the piston cavity of the parking mechanism 230 to flow back to the oil storage 220 through the first electromagnetic valve 20 to lock the parking mechanism 230.

[0123] The first passage and the second passage of the first electromagnetic valve 20 can be two working positions of the first electromagnetic valve 20. In one example, the first electromagnetic valve 20 can be a two-position three-way electromagnetic valve, and in Figure 1 In the embodiment shown, the first passage is the left position of the first electromagnetic valve 20, and the second passage is the right position of the first electromagnetic valve 20. By controlling the parking mechanism 230 through the first electromagnetic valve 20, the parking mechanism 230 can be quickly responsive, and the response speed of the vehicle 10000 can be improved.

[0124] The first electromagnetic valve 20 can also be a two-position three-way direct-drive proportional electromagnetic valve, so that the first passage and the second passage can be opened at the same time, and the opening degree is adjustable. In this embodiment, the second passage can be in communication with the oil storage 220, so that the opening degree ratio of the second passage and the first passage can adjust the oil pressure received by the parking mechanism 230, that is, the pressure of the first oil pressure can be changed.

[0125] When the first electromagnetic valve 20 opens the second passage, the first oil pressure decreases, and in Figure 1 In the embodiment shown, the piston rod can be pushed back to the position of locking the parking mechanism 230 under the push of the spring. When the first electromagnetic valve 20 opens the first passage, the first oil pressure rises, and in Figure 1 In the embodiment shown, the piston rod moves to the position of unlocking the parking mechanism 230 under the drive of the oil pressure.

[0126] In some embodiments, the hydraulic system 1000 further comprises a first cooling and lubricating oil circuit adapted to connect the electronic pump 10 and the power transmission assembly 210.

[0127] In some embodiments, the first cooling lubricating oil circuit further comprises an oil cooler 60 disposed between the electronic pump 10 and the power transmission assembly 210.

[0128] The oil cooler 60 can cool the oil in the hydraulic system, so that the oil is cooled in the oil cooler 60 before entering the power transmission assembly 210, thereby improving the cooling effect on the power transmission assembly 210. The oil cooler 60 can also stabilize the oil in the working temperature range of the oil, so that the viscosity of the oil is appropriate to ensure the lubrication effect on the power transmission assembly 210.

[0129] In some embodiments, the first cooling lubricating oil circuit further comprises a first filter 70 disposed between the oil cooler 60 and the power transmission assembly 210.

[0130] The first filter 70 can filter impurities to prevent impurities from mixing into the power transmission assembly 210, causing oil circuit blockage or device wear. The first filter 70 can be a pressure filter, thereby improving the filtering effect.

[0131] In some embodiments, the first cooling lubricating oil circuit further comprises a bypass valve 80 disposed between the electronic pump 10 and the power transmission assembly 210, the bypass valve 80 being configured to communicate the electronic pump 10 and the power transmission assembly 210 when the oil pressure difference between the two ends of the oil cooler 60 and / or the first filter 70 is greater than a first preset value.

[0132] When the oil pressure difference between the two ends of the oil cooler 60 and / or the first filter 70 is greater than the first preset value, it means that at least one of the oil cooler 60 and the first filter 70 can be blocked, which is easy to cause insufficient oil pumped to the power transmission assembly 210. When the oil cooler 60 or the first filter 70 can be blocked, the bypass valve 80 constitutes an emergency oil circuit, which ensures the oil supply to the power transmission assembly 210, thereby ensuring the lubrication and / or cooling effect on the power transmission assembly 210.

[0133] Please refer to Figure 1 It can be seen that the bypass valve 80 can have two control ends connected to the oil circuits on both sides of the bypass valve 80. When the control end connected to the inlet of the oil cooler 60 has a larger oil pressure and the control end connected to the outlet of the first filter 70 has a smaller oil pressure, the bypass valve 80 is controlled to open, so that the oil circuit bypassing the oil cooler 60 and the first filter 70 is opened, and the oil circuit supplies oil to the power transmission assembly 210.

[0134] In some embodiments, the first cooling lubricating oil circuit comprises a first check valve 50 disposed between the electronic pump 10 and the power transmission assembly 210, the first check valve 50 being configured to limit the oil from flowing back to the power transmission assembly 210.

[0135] The first one-way valve 50 prevents the oil from flowing back to the second solenoid valve 40, so that when the oil pressure of the electric pump 10 is not sufficient, the oil is maintained in the powertrain assembly 210, avoiding the cooling and / or lubrication effect from being reduced too much. In addition, in some embodiments, such as in the embodiment shown in Figure 1 the embodiment shown, it can also prevent part of the oil pumped by the mechanical pump 100 from flowing into the electric pump 10, preventing damage to the electric pump 10.

[0136] In some embodiments, the hydraulic system 1000 further comprises a second solenoid valve 40, which comprises a third passage and a fourth passage that can be opened alternately; the third passage communicates the electric pump 10 and the parking mechanism 230, and the fourth passage communicates the electric pump 10 and the powertrain assembly 210.

[0137] Please refer to Figure 1 In some embodiments, the controller 280 is configured to, in the case of receiving an unlocking signal, control the second solenoid valve 40 to open the third passage to unlock the parking mechanism 230, or in the case of receiving a cooling and / or lubrication signal of the powertrain assembly 210, control the second solenoid valve 40 to open the fourth passage to cool and / or lubricate the powertrain assembly 210.

[0138] In this way, after unlocking the parking mechanism 230, the electric pump 10 can be used to pump oil for cooling and / or lubricating the powertrain assembly 210, improving the cooling and / or lubrication capacity of the powertrain system. In addition, the second solenoid valve 40 is a solenoid valve, so the speed of switching the oil path is faster, improving the response speed of the hydraulic system.

[0139] The powertrain assembly 210 can include power and / or transmission elements, wherein the power elements refer to at least one of the motor, the engine 3000, and the generator 5000 (some hybrid systems also use the generator 5000 to drive the vehicle 10000), or other elements that can be used to drive the vehicle 10000 to move; the transmission elements refer to at least one of the transmission shaft, the transmission gear, the transmission pulley, the differential, the gear, the belt, the chain, the clutch (wet clutch, dry clutch, or electromagnetic clutch, etc.), and the coupling 270 (fluid coupling 270 or fluid torque converter, etc.), or other elements that can be used to transmit power.

[0140] In Figure 1 the embodiment shown, the powertrain assembly 210 is the drive motor 4000, the clutch, the generator 5000, and the shaft tooth (shafting). Among them, the drive motor 4000 and the generator 5000 can both be oil-cooled motors, so that the oil can enter the inside of the motor to cool the motor and also lubricate the motor. The clutch can be a wet clutch, so that the oil can lubricate and cool the clutch. The oil can be sprayed between the shaft teeth or overflowed from the shaft teeth to lubricate the shaft teeth.

[0141] In Figure 1 In the fact way shown, the second electromagnetic valve 40 can be a switch electromagnetic valve, so as to improve the speed of the second electromagnetic valve 40 switching between the third passage and the fourth passage. It can be seen that the second electromagnetic valve 40 switches the oil passage of the oil pumped by the electronic pump 10, so that the oil pumped by the electronic pump 10 can enter the parking mechanism 230 or enter the power transmission assembly 210. The first electromagnetic valve 20 and the accumulator 30 can also be arranged on the oil passage of the power mechanism to the second electromagnetic valve 40.

[0142] In some embodiments, the hydraulic system 1000 further comprises a second filter 90 arranged between the second electromagnetic valve 40 and the electronic pump 10.

[0143] The second filter 90 filters the oil pumped by the second electromagnetic valve 40, avoiding the blockage of the oil passage. The second filter 90 can also be a pressure filter.

[0144] In some embodiments, the oil storage hydraulic system 1000 further comprises a mechanical pump 100 and a second cooling lubricating oil passage, the second cooling lubricating oil passage being communicated between the mechanical pump 100 and the power transmission assembly 210.

[0145] In some embodiments, the second cooling lubricating oil passage comprises a second check valve 140 arranged between the mechanical pump 100 and the power transmission assembly 210.

[0146] In some embodiments, the second cooling lubricating oil passage further comprises an oil cooler 60 arranged between the mechanical pump 100 and the power transmission assembly 210.

[0147] In some embodiments, the second cooling lubricating oil passage further comprises a first filter 70 arranged between the oil cooler 60 and the power transmission assembly 210.

[0148] In some embodiments, the hydraulic system 1000 further comprises a mechanical pump 100 and a high-pressure oil passage, the high-pressure oil passage being adapted to communicate between the mechanical pump 100 and the coupling 270; the mechanical pump 100 is used to provide a second oil pressure to the coupling 270.

[0149] In some embodiments, the power system comprises a power transmission assembly 210, the hydraulic system 1000 comprises a second cooling lubricating oil passage, the second cooling lubricating oil passage being communicated between the mechanical pump 100 and the power transmission assembly 210, the second cooling lubricating oil passage comprises a second check valve 140, the second check valve 140 being arranged between the mechanical pump 100 and the power transmission assembly 210.

[0150] In this way, the oil is prevented from flowing back to the mechanical pump 100 and the oil storage 220 through the spool valve 120, and the efficiency of oil supply to the power transmission assembly 210 is improved.

[0151] The coupling 270 of the power system can be a coupling 270 for switching the working mode of the vehicle 10000, for example, the vehicle 10000 can work in series or parallel mode, wherein the series mode is a mode in which the engine 3000 drives the generator 5000 to supply power to the drive motor 4000, and the drive motor 4000 drives the vehicle 10000 to move; the parallel mode is a mode in which the engine 3000 and the drive motor 4000 both directly participate in driving the vehicle 10000 to move. During mode switching, the coupling 270 needs to act to change the power transmission path (for example, change the power transmission path from the engine 3000 to the generator 5000 to the power transmission path from the engine 3000 to the wheels). The coupling 270 can form a pure electric mode transmission path in a natural state, and form an engine 3000 participating transmission path under the drive of the second oil pressure. In this way, after the engine 3000 starts, the mechanical pump 100 can be directly driven to provide the second oil pressure to drive the coupling 270 to realize mode switching, and this process does not need to consume electric energy, thereby saving electric quantity.

[0152] In some embodiments, the second cooling lubricating oil circuit further comprises an oil cooler 60 arranged between the second check valve 140 and the power transmission assembly 210.

[0153] In some embodiments, the second cooling lubricating oil circuit further comprises a first filter 70 arranged between the oil cooler 60 and the power transmission assembly 210.

[0154] In some embodiments, the second cooling lubricating oil circuit can share the oil cooler 60 and the first filter 70 with the first cooling lubricating oil circuit.

[0155] In some embodiments, the high-pressure oil circuit comprises a third electromagnetic valve 110, and the mechanical pump 100 is connected to the coupling 270 through the third electromagnetic valve 110.

[0156] When the coupling 270 is a wet clutch or the like, the oil pressure for driving the coupling 270 needs to be changed so that the coupling 270 can be in a semi-coupling state (half-coupling state) to eliminate the speed difference between the two sides of the coupling 270, so that the mode switching is smoother. The pressure of the driving oil pressure is controlled by the third electromagnetic valve 110, that is, the pressure of the second oil pressure is changed, so that the control of the second oil pressure is more accurate and fast.

[0157] The third electromagnetic valve 110 can be a direct-drive proportional electromagnetic valve to change the second oil pressure.

[0158] In some embodiments, the hydraulic system 1000 comprises a plurality of high-pressure oil circuits.

[0159] In some embodiments, the number of couplings 270 is two, and the number of third electromagnetic valves 110 is also two, the two couplings 270 are respectively communicated with the mechanical pump 100 through the two third electromagnetic valves 110, and the combination of the two couplings 270 on demand can make the whole vehicle have a larger proportion in the high efficiency area of the engine, thereby improving the efficiency of the whole vehicle.

[0160] In some embodiments, the hydraulic system 1000 further comprises a control oil circuit, the control oil circuit being configured to control the flow of the power transmission assembly 210.

[0161] In some embodiments, the hydraulic system 1000 further comprises a flow valve 160, the flow valve 160 being arranged on the power transmission assembly 210, the flow valve 160 comprising a third control end 161, the control oil circuit being connected to the third control end 161, and the third control end 161 being configured to control the opening of the flow valve 160 by communicating with the control oil circuit.

[0162] In some embodiments, the control oil circuit comprises a fourth electromagnetic valve 130, and the mechanical pump 100 is connected to the power transmission assembly 210 through the fourth electromagnetic valve 130.

[0163] In some embodiments, the hydraulic system 1000 further comprises a spool valve 120, the spool valve 120 being arranged between the coupling 270 and the mechanical pump 100, the spool valve 120 comprising a fifth passage, a first control end 121 and a second control end 122, the fourth electromagnetic valve 130 being connected to the first control end 121, and the fifth passage being connected to the coupling 270 and the mechanical pump 100; one end of the fourth electromagnetic valve 130 is connected to the first control end 121, and the other end is connected to the output end of the mechanical pump 100; and the second control end 122 is connected to the output end of the mechanical pump 100.

[0164] Please refer to Figure 1 In some embodiments, the controller 280 is configured to control the opening of the fourth electromagnetic valve 130 to change the oil pressure difference between the first control end 121 and the second control end 122, so as to change the opening of the fifth passage.

[0165] The spool valve 120 controls the output oil pressure of the mechanical pump 100 for the first time, and the third electromagnetic valve 110 controls the output oil pressure of the mechanical pump 100 for the second time, thereby forming two-stage control of the size of the second oil pressure, improving the control accuracy of the second oil pressure, and widening the adjustment range of the second oil pressure. Meanwhile, the fourth electromagnetic valve 130 is used to control the spool valve 120 through the first control end 121, thereby improving the control accuracy and speed of the spool valve 120.

[0166] Please refer to Figure 1 In some embodiments, the fifth passage is further connected to the power transmission assembly 210.

[0167] The mechanical pump 100 can also provide lubrication and / or cooling oil to the power transmission assembly 210, and improve the lubrication and / or cooling effect.

[0168] In some embodiments, the hydraulic system 1000 further comprises a flow valve 160 disposed on the power transmission assembly 210, the flow valve 160 comprising a third control end 161; the fourth electromagnetic valve 130 further communicates with the third control end 161, and the third control end 161 is configured to control the opening degree of the flow valve 160 through the fourth electromagnetic valve 130. Figure 1 In some embodiments, the fourth electromagnetic valve 130 can be a two-position three-way pilot proportional electromagnetic valve, and the fourth electromagnetic valve 130 can communicate with the oil storage device 220 to transport excess oil to the oil storage device 220 for reuse when the control oil pressure is high.

[0169] In some embodiments, the spool valve 120 further comprises a sixth passage that communicates the fifth passage with the oil storage device 220; the spool valve 120 is configured to open the sixth passage when the oil pressure of the second control end 122 is higher than the second preset value.

[0170] In some embodiments, the spool valve 120 further comprises a sixth passage that communicates the fifth passage with the oil storage device 220; the spool valve 120 is configured to open the sixth passage when the oil pressure of the second control end 122 is higher than the second preset value.

[0171] The sixth passage can communicate with the fifth passage, so that when the oil pressure of the second control end 122 is too high (higher than the second preset value), i.e., the oil pressure pumped by the mechanical pump 100 is too high, the mechanical pump 100 is directly communicated with the oil storage device 220 to form a pressure relief protection.

[0172] Figure 1 In the illustrated embodiment, the spool valve 120 can be a three-position four-way valve, when the spool valve 120 is in the left position, both the fifth passage and the sixth passage are closed; when the spool valve 120 is between the left position and the middle position, the fifth passage is partially open, and the opening degree is controlled by the third electromagnetic valve 110; when the spool valve 120 works in the right position, both the fifth passage and the sixth passage are open to form a pressure relief protection. In addition, the spool valve 120 can also work in the position between the middle position and the right position, so that the pressure relief speed is adjustable, and the adjustment ability of the hydraulic system 1000 to the oil pressure is improved.

[0173] In some embodiments, the hydraulic system 1000 further comprises a pressure relief valve 150, and the pressure relief valve 150 communicates with the fifth passage.

[0174] The pressure relief valve 150 can discharge oil when the oil pressure is too high, and the oil can be discharged to the oil storage device 220 to form a pressure relief protection.

[0175] In some embodiments, the hydraulic system 1000 further comprises a flow valve 160 disposed on the power transmission assembly 210, the flow valve 160 comprising a third control end 161; the fourth electromagnetic valve 130 further communicates with the third control end 161, and the third control end 161 is configured to control the opening degree of the flow valve 160 through the fourth electromagnetic valve 130.

[0176] The opening degree of the fifth passage of the fourth solenoid valve 130 affects the oil supply amount of the mechanical pump 100 to the power transmission assembly 210. Generally, the greater the opening degree of the fifth passage, the greater the oil supply amount to the power transmission assembly 210, and the more oil the power transmission assembly 210 receives, the greater the opening degree of the flow valve 160 is required to allow a greater amount of oil to flow through. Thus, the opening degree of the flow valve 160 can be directly controlled by the flow of the fourth solenoid valve 130 connecting one end of the spool valve 120, and when the flow of the fourth solenoid valve 130 connecting one end of the spool valve 120 is greater than a preset value, the flow valve 160 is opened to allow a large flow, which is a mechanical control structure, low cost and high stability.

[0177] In Figure 1 In the embodiment shown, the flow valve 160 is an on-off valve, and in other embodiments, the flow valve 160 can also be a proportional valve.

[0178] Please refer to Figure 1 In some embodiments, when the vehicle 10000 needs to be unlocked, the unlocking process is as follows:

[0179] The vehicle 10000 sends an unlock signal, the VCU starts the electronic pump 10, the electronic pump 10 pumps oil from the oil storage 220, after the oil is pumped out of the electronic pump 10, it passes through the second filter 90 and enters the second solenoid valve 40, at this time the second solenoid valve 40 is energized to be in the left position, so that the oil can enter the first solenoid valve 20, the first solenoid valve 20 is energized to be in the left position to charge the hydraulic cylinder 231, when the position sensor 240 recognizes that the hydraulic rod 232 reaches the unlocking position, the proportional solenoid is energized to lock the hydraulic rod 232 at the unlocking position, and then the first solenoid valve 20 and the second solenoid valve 40 are de-energized to be in the right position.

[0180] When the oil passes through the air bag accumulator 30, it can maintain and stabilize the oil pressure charged into the hydraulic cylinder 231, and at the same time can collect excess oil pressure energy in the circuit.

[0181] Please refer to Figure 1 In some embodiments, when the vehicle 10000 needs to be locked, the locking process is as follows:

[0182] The vehicle 10000 sends a lock signal, and when the position sensor 240 recognizes that the hydraulic rod 232 is locked at the unlocking position, the proportional solenoid is de-energized, the hydraulic rod 232 returns the oil through the right position of the first solenoid valve 20 to the oil storage 220 under the action of the spring, and then the proportional solenoid is energized to lock the hydraulic rod 232 at the locking position.

[0183] Please refer to Figure 1 In some embodiments, the cooling and / or lubrication function can be achieved by the following process:

[0184] When the hydraulic system 1000 completes the unlocking process, the second electromagnetic valve 40 is in the right position, and the oil will be pumped by the electronic pump 10 to the first one-way valve 50. At this time, if the vehicle 10000 is in series or parallel mode, part of the oil will also be pumped by the mechanical pump 100 through the spool valve 120 to the outlet of the first one-way valve 50. The oil pumped by the electronic pump 10 and the mechanical pump 100 is combined at the outlet of the first one-way valve 50, and then passes through the oil cooler 60 and the first filter 70 or passes through the bypass valve 80 to provide oil for the required cooling and lubrication components.

[0185] Please refer to ​ In some embodiments, when the coupling 270 is a clutch, the clutch engagement function can be achieved by the following process:

[0186] The engine 3000 of the vehicle 10000 is started, and the mechanical pump 100 sucks oil from the oil storage part 220. Part of the oil pumped by the mechanical pump 100 enters the fourth electromagnetic valve 130 in the right position to control the opening size of the valve port of the spool valve 120 and the flow valve. Another part of the oil enters the second control end 122 and controls the opening of the spool valve 120 together with the fourth electromagnetic valve 130. The oil passes through the spool valve 120 to at least one third electromagnetic valve 110 to achieve the clutch engagement function.

[0187] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, but as long as the combinations of the technical features do not contradict, they should be considered within the scope of the present disclosure. Meanwhile, other embodiments can be derived from the above-described embodiments, so that structural and logical substitutions and changes can be made without departing from the scope of the present disclosure.

[0188] The above-described embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as limiting the scope of the patent. It should be noted that for ordinary skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are within the scope of the present application. Therefore, the scope of protection of the patent of the present application should be subject to the appended claims.

Claims

1. A hydraulic system (1000), characterized in that, The hydraulic system (1000) comprises: an oil storage member (220); an electric pump (10) connected to the oil storage member (220); a parking oil circuit adapted to connect the electric pump (10) and a parking mechanism (230), the parking mechanism being configured to be provided with a first oil pressure by the electric pump (10) to pump oil from the oil storage member (220) to unlock the parking mechanism (230).

2. The hydraulic system (1000) of claim 1, characterized in that, The parking oil circuit further comprises an accumulator (30) connected between the parking mechanism (230) and the electric pump (10), the accumulator (30) being used to store oil with the first oil pressure.

3. The hydraulic system (1000) of claim 1, wherein, The parking mechanism (230) comprises a hydraulic cylinder (231) and a hydraulic rod (232); the hydraulic rod (232) has a locked position and an unlocked position, and the electric pump (10) is used to provide the first oil pressure to the hydraulic cylinder (231) to drive the hydraulic rod (232) to move from the locked position to the unlocked position.

4. The hydraulic system (1000) of claim 3, characterized in that The parking mechanism (230) is provided with a position sensor (240) for identifying the position of the hydraulic rod (232).

5. The hydraulic system (1000) of claim 3, wherein, The parking mechanism (230) further comprises an actuating mechanism (250) and a locking pin (260), and the hydraulic rod (232) is provided with a first locking groove (2321) and a second locking groove (2322); when the hydraulic rod (232) is in the unlocked position, the actuating mechanism (250) drives the locking pin (260) to cooperate with the first locking groove (2321); and / or when the hydraulic rod (232) is in the locked position, the actuating mechanism (250) drives the locking pin (260) to cooperate with the second locking groove (2322).

6. The hydraulic system (1000) of claim 1, wherein, The parking oil circuit further comprises a first electromagnetic valve (20), the first electromagnetic valve (20) comprising a first passage and a second passage, the first passage connecting the parking mechanism (230) and the electric pump (10), and the second passage connecting the parking mechanism (230) and the oil storage member (220).

7. The hydraulic system (1000) of claim 1, wherein, The hydraulic system (1000) further comprises a first cooling and lubricating oil circuit adapted to connect the electric pump (10) and a power transmission assembly (210).

8. The hydraulic system (1000) of claim 7, characterized by The first cooling and lubricating oil circuit further comprises an oil cooler (60) arranged between the electric pump (10) and the power transmission assembly (210).

9. The hydraulic system (1000) of claim 8, characterized by The first cooling and lubricating oil circuit further comprises a first filter (70) arranged between the oil cooler (60) and the power transmission assembly (210).

10. The hydraulic system (1000) of claim 9, characterized by The first cooling and lubricating oil circuit further comprises a bypass valve (80) arranged between the electric pump (10) and the power transmission assembly (210), the bypass valve (80) being configured to connect the electric pump (10) and the power transmission assembly (210) when the oil pressure difference between the two ends of the oil cooler (60) and / or the first filter (70) is greater than a first preset value.

11. The hydraulic system (1000) of claim 7, wherein, The first cooling lubricating oil passage comprises a first check valve (50) disposed between the electronic pump (10) and the power transmission assembly (210), the first check valve (50) being configured to limit the backflow of oil from the power transmission assembly (210).

12. The hydraulic system (1000) of claim 7, wherein, The hydraulic system (1000) further comprises a second electromagnetic valve (40), the second electromagnetic valve (40) comprising a third passage and a fourth passage which can be opened alternatively; the third passage communicates the electronic pump (10) and the parking mechanism (230), and the fourth passage communicates the electronic pump (10) and the power transmission assembly (210).

13. The hydraulic system (1000) of claim 12, characterized by The hydraulic system (1000) further comprises a second filter (90) disposed between the second electromagnetic valve (40) and the electronic pump (10).

14. The hydraulic system (1000) of claim 7, wherein, The hydraulic system (1000) further comprises: a mechanical pump (100); a second cooling lubricating oil passage which communicates the mechanical pump (100) and the power transmission assembly (210).

15. The hydraulic system (1000) of claim 14, characterized by The second cooling lubricating oil passage comprises a second check valve (140) disposed between the mechanical pump (100) and the power transmission assembly (210).

16. The hydraulic system (1000) of claim 14, wherein, The second cooling lubricating oil passage further comprises an oil cooler (60) disposed between the mechanical pump (100) and the power transmission assembly (210).

17. The hydraulic system (1000) of claim 16, characterized by The second cooling lubricating oil passage further comprises a first filter (70) disposed between the oil cooler (60) and the power transmission assembly (210).

18. The hydraulic system (1000) according to claim 1 or 14, characterized by The hydraulic system (1000) further comprises: a mechanical pump (100); a high-pressure oil passage adapted to communicate the mechanical pump (100) and a coupling (270); the mechanical pump (100) is used to provide a second oil pressure to the coupling (270).

19. The hydraulic system (1000) of claim 18, characterized by The high-pressure oil passage comprises a third electromagnetic valve (110), the mechanical pump (100) is connected to the coupling (270) through the third electromagnetic valve (110).

20. The hydraulic system (1000) of claim 19, characterized by The hydraulic system (1000) comprises a plurality of the high-pressure oil passages.

21. The hydraulic system (1000) of claim 18, wherein, The hydraulic system (1000) further comprises: a control oil passage used to control the flow of the power transmission assembly (210).

22. The hydraulic system (1000) of claim 21, characterized by The hydraulic system (1000) further comprises a flow valve (160) disposed on the power transmission assembly (210), the flow valve (160) comprising a third control end (161), the control oil passage is connected to the third control end (161), and the third control end (161) is configured to control the opening of the flow valve (160) by communicating the control oil passage.

23. The hydraulic system (1000) of claim 21, wherein, The control oil passage comprises a fourth electromagnetic valve (130), the mechanical pump (100) is connected to the power transmission assembly (210) through the fourth electromagnetic valve (130).

24. The hydraulic system (1000) of claim 23, characterized by The hydraulic system (1000) further comprises a spool valve (120) disposed between the coupling (270) and the mechanical pump (100), the spool valve (120) comprising a fifth passage, a first control end (121) and a second control end (122), the fourth solenoid valve (130) being in communication with the first control end (121), the fifth passage being in communication with the coupling (270) and the mechanical pump (100); one end of the fourth solenoid valve (130) being connected with the first control end (121), the other end being connected with the output end of the mechanical pump (100); the second control end (122) being connected with the output end of the mechanical pump (100).

25. The hydraulic system (1000) of claim 24, characterized by The spool valve (120) further comprises a sixth passage, the sixth passage being in communication with the fifth passage and the oil storage member (220); the spool valve (120) being configured to open the sixth passage when the oil pressure of the second control end (122) is higher than a second preset value.

26. The hydraulic system (1000) of claim 24, wherein, The hydraulic system (1000) further comprises a pressure relief valve (150), the pressure relief valve (150) being in communication with the fifth passage.

27. The hydraulic system (1000) according to any one of claims 1-17, characterized in that, The hydraulic system (1000) further comprises a controller (280), the controller (280) being configured to control the electronic pump (10) to provide a first oil pressure to the parking mechanism (230) to unlock the parking mechanism (230) in the pure electric mode and in the case that an unlock signal of the parking mechanism (230) is received.

28. A transmission (2000) characterized by, The hydraulic system (1000) according to any one of claims 1-27.

29. A vehicle (10000), characterized in that The transmission (2000) according to claim 28.

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