Fluid control device, electric drive system and vehicle

Abstract

The invention discloses a fluid control device, an electric drive system and a vehicle. Wherein the third cavity is arranged between the first cavity and the second cavity; the first flow control unit is communicated with the first cavity and the third cavity, and the first flow control unit is used for controlling flowing of fluid between the first cavity and the third cavity and enabling the flow of the fluid flowing from the first cavity to the third cavity to be different from the flow of the fluid flowing from the third cavity to the first cavity; the second flow control unit is communicated with the second cavity and the third cavity; the second flow control unit is used for controlling the fluid to flow between the second cavity and the third cavity and enabling the flow of the fluid flowing from the second cavity to the third cavity to be different from the flow of the fluid flowing from the third cavity to the second cavity; the fluid pump is arranged in the third cavity and used for pumping fluid in the third cavity to the first cavity and the second cavity. According to the technical scheme, air suction of the oil pump can be effectively reduced, and the cooling effect on the motor is improved.

Description

Technical Field

[0001] This application belongs to the technical field of vehicles, and particularly relates to a fluid control device, an electric drive system, and a vehicle. Background Art

[0002] The electric drive system is mainly used to provide power for the vehicle and is the core component of the vehicle. The current electric drive system is mainly a distributed electric drive with a dual-motor structure. The axial dimension of the distributed electric drive system is relatively large, and the space for the axial distribution of the oil also increases accordingly. When the vehicle rolls or makes a movement with a large centrifugal force, the oil is easily aggregated on one side, causing the oil pump to suck air, which seriously affects the cooling of the motor by the oil. Summary of the Invention

[0003] An object of this application is to provide a fluid control device that can effectively reduce the air suction of the oil pump and improve the cooling effect on the motor.

[0004] Other features and advantages of this application will become apparent through the following detailed description, or be learned in part through the practice of this application.

[0005] According to one aspect of the embodiments of this application, this application provides a fluid control device including a first cavity, a second cavity, a third cavity, and a fluid pump. The third cavity is disposed between the first cavity and the second cavity;

[0006] A first flow control unit is disposed between the first cavity and the third cavity. The first flow control unit communicates the first cavity and the third cavity. The first flow control unit is used to control the flow of fluid between the first cavity and the third cavity and make the fluid flow rate from the first cavity to the third cavity different from the fluid flow rate from the third cavity to the first cavity;

[0007] A second flow control unit is disposed between the second cavity and the third cavity. The second flow control unit communicates the second cavity and the third cavity. The second flow control unit is used to control the flow of fluid between the second cavity and the third cavity and make the fluid flow rate from the second cavity to the third cavity different from the fluid flow rate from the third cavity to the second cavity;

[0008] The fluid pump is disposed in the third cavity and is used to pump the fluid in the third cavity to the first cavity and the second cavity.

[0009] In one aspect, the fluid flow rate from the first cavity to the third cavity is greater than the fluid flow rate from the third cavity to the first cavity, and the fluid flow rate from the second cavity to the third cavity is greater than the fluid flow rate from the third cavity to the second cavity.

[0010] In one aspect, the fluid flow rate from the third cavity to the first cavity is zero, and the fluid flow rate from the third cavity to the second cavity is zero.

[0011] In one aspect, the first flow control unit includes a passive control valve or an active control valve, the second control unit includes a passive control valve or an active control valve, the passive control valve drives the valve core to open or close through its own fluid pressure, and the active control valve actively drives the valve core to open or close through a power source.

[0012] In one aspect, the passive control valve is a ball check valve, a rotary check valve or a flap check valve.

[0013] In one aspect, the active control valve is an electromagnetic check valve, a piezoelectric check valve or a hydraulic check valve.

[0014] In one aspect, a filter is further included, the filter is disposed in the third cavity, the filter is connected to the input end of the fluid pump, and the filter is used to filter the fluid in the third cavity and then transport it to the fluid pump.

[0015] In one aspect, the number of the fluid pumps is one, and the number of the filters is one.

[0016] In addition, to solve the above problems, the present application further provides an electric drive system, the electric drive system includes a first motor, a second motor, and a fluid control device as described above, the first motor is disposed in the first cavity, the second motor is disposed in the second cavity, and the fluid pump pumps the fluid in the third cavity to the first cavity to cool the first motor and pumps it to the second cavity to cool the second motor.

[0017] In one aspect, a controller and an attitude sensor are further included, the controller is connected to the attitude sensor, the controller is further respectively connected to the first flow control unit and the second flow control unit, the attitude sensor is used to detect the attitude of the electric drive system, and the controller controls the opening or closing states of the first flow control unit and the second flow control unit based on the attitude of the electric drive system.

[0018] In one aspect, when the electric drive system is in a horizontal state, the first flow control unit and the second flow control unit are located on the same horizontal plane, and the bottom surface of the third cavity is lower than the bottom surfaces of the first cavity and the second cavity.

[0019] In one aspect, the electric drive system is a distributed electric drive. The first motor is drivingly connected to the first wheel of the vehicle and is used to control the movement and steering of the first wheel. The second motor is drivingly connected to the second wheel of the vehicle and is used to control the movement and steering of the second wheel. The first wheel and the second wheel are located on opposite sides of the vehicle's forward direction.

[0020] In one aspect, the electric drive system further includes a third motor, a fourth motor, and another fluid control device as described above. The third motor is disposed in the first cavity of the other fluid control device, and the fourth motor is disposed in the second cavity of the other fluid control device. The fluid pump of the other fluid control device pumps the fluid in the third cavity to the first cavity to cool the third motor, and pumps it to the second cavity to cool the fourth motor.

[0021] In one aspect, the electric drive system is a distributed four-wheel drive. The third motor is drivingly connected to the third wheel of the vehicle and is used to control the movement and steering of the third wheel. The fourth motor is drivingly connected to the fourth wheel of the vehicle and is used to control the movement and steering of the fourth wheel. The third wheel and the fourth wheel are located on opposite sides of the vehicle's forward direction. The first wheel and the third wheel are located on the same side of the vehicle's forward direction, and the second wheel and the fourth wheel are located on the same side of the vehicle's forward direction.

[0022] In addition, to solve the above problems, the present application further provides a vehicle, including a chassis and the electric drive system as described above. The chassis forms an installation space, and the electric drive system is disposed in the installation space.

[0023] In the present application, when the fluid control device is in an inclined state, the oil in the third cavity will gather on one side, the liquid level height of the oil will decrease, and the amount of oil that the fluid pump can pump will decrease. At this time, the first flow control unit or the second flow control unit can play a role. The first flow control unit can return the oil in the first cavity to the third cavity, or the second flow control unit can return the oil in the second cavity to the third cavity. Thereby, the liquid level height of the oil in the third cavity is increased, ensuring that the fluid pump can effectively contact the oil, thereby effectively reducing the cavitation of the fluid pump, that is, reducing the cavitation of the oil pump, ensuring that the oil can flow to the motor position, and improving the cooling effect on the motor.

[0024] It should be understood in this application that the above general description and the following detailed description are only exemplary and explanatory, and should not limit this application. Brief Description of the Drawings

[0025] The drawings herein are incorporated into the specification and form a part of this specification, showing embodiments consistent with this application, and are used together with the specification to explain the principles of this application. Obviously, the drawings in the following description are only some embodiments of this application, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0026] Figure 1 Schematically shows a structural diagram of the electric drive system of this application.

[0027] Figure 2 Schematically shows a structural diagram of the structure where oil fluid is arranged in the electric drive system of this application.

[0028] Figure 3 Schematically shows a structural diagram of the electric drive system of this application tilted to the right.

[0029] Figure 4 Schematically shows a structural diagram of the electric drive system of this application tilted to the left.

[0030] Figure 5 Schematically shows a wiring connection diagram of the controller and the attitude sensor in the electric drive system of this application.

[0031] The description of the reference numerals is as follows:

[0032] 100, the third cavity; 200, the first cavity; 300, the second cavity; 400, the fluid pump; 510, the first flow control unit; 520, the second flow control unit; 530, the controller; 540, the attitude sensor; 600, the filter; 710, the first oil injection pipe; 720, the second oil injection pipe; 730, the common pipeline; 810, the first motor; 820, the second motor; 900, the oil fluid;

[0033] 111, the first outer wall; 112, the second outer wall. Detailed Embodiments

[0034] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be more complete and comprehensive, and will fully convey the concept of the example embodiments to those skilled in the art.

[0035] Refer to Figures 1 to 4As shown in the figure, the present application provides a fluid control device. The fluid control device is mainly applied in vehicles and can also be applied to other types of vehicles, such as ships. When the motor is running, heat is generated, and the heat generated by the motor can be carried away by the coolant. The coolant can be oil, so that while cooling the motor, lubrication can also be achieved, reducing the friction of various connecting shafts in the motor.

[0036] During the driving of the vehicle, due to the uneven road surface or turning, the vehicle will tilt to one side, which easily causes the oil 900 to accumulate on one side. For this reason, the fluid control device includes: a first cavity 200, a second cavity 300, a third cavity 100, a fluid pump 400, a first flow control unit 510, and a second flow control unit 520.

[0037] A first flow control unit 510 is provided between the first cavity 200 and the third cavity 100. The first flow control unit 510 connects the first cavity 200 and the third cavity 100. The first flow control unit 510 is used to control the flow of fluid between the first cavity 200 and the third cavity 100 and make the fluid flow rate from the first cavity 200 to the third cavity 100 different from the fluid flow rate from the third cavity 100 to the first cavity 200. The first flow control unit 510 is arranged between the third cavity 100 and the first cavity 200 and connects the first cavity 200 and the third cavity 100. After the first flow control unit 510 is opened, the first cavity 200 and the third cavity 100 can be connected, and the oil 900 in the first cavity 200 can flow to the third cavity 100. The fluid volume between the first cavity 200 and the third cavity 100 can be adjusted through the first flow control unit 510.

[0038] A second flow control unit 520 is provided between the second cavity 300 and the third cavity 100. The second flow control unit 520 connects the second cavity 300 and the third cavity 100. The second flow control unit 520 is used to control the flow of fluid between the second cavity 300 and the third cavity 100 and make the fluid flow rate from the second cavity 300 to the third cavity 100 different from the fluid flow rate from the third cavity 100 to the second cavity 300. The second flow control unit 520 is arranged between the third cavity 100 and the second cavity 300 and connects the second cavity 300 and the third cavity 100. After the second flow control unit 520 is opened, the second cavity 300 and the third cavity 100 can be connected, and the oil 900 in the second cavity 300 can flow to the third cavity 100. The fluid volume between the second cavity 300 and the third cavity 100 can be adjusted through the second flow control unit 520.

[0039] The fluid pump 400 is disposed in the third cavity 100 and is used to pump the fluid in the third cavity 100 to the first cavity 200 and the second cavity 300.

[0040] Specifically, the fluid pump 400 is arranged inside the third cavity 100, and the first cavity 200 and the second cavity 300 are respectively arranged on both sides of the third cavity 100. For example, the first cavity 200 is arranged on the left side of the third cavity 100, and the second cavity 300 is arranged on the right side of the third cavity 100. Through the first flow control unit 510 and the second flow control unit 520, the oil 900 in the first cavity 200 and the second cavity 300 can be made to flow back into the third cavity 100 to ensure that the fluid pump 400 can contact the oil 900.

[0041] Furthermore, the first cavity 200, the second cavity 300, and the third cavity 100 can be fully enclosed or semi-enclosed. The third cavity 100 is used to store the oil 900; under normal circumstances of the third cavity 100, that is, when the fluid control device is in a horizontal equilibrium state, there is enough oil 900 stored in the third cavity 100, and the liquid level of the oil 900 can at least submerge the oil suction port of the fluid pump 400.

[0042] In this embodiment, when the fluid control device is in an inclined state, the oil in the third cavity 100 will gather on one side, the liquid level height of the oil will decrease, and the amount of oil that the fluid pump 400 can pump will decrease. At this time, the first flow control unit 510 or the second flow control unit 520 can play a role. The first flow control unit 510 can make the oil in the first cavity 200 flow back into the third cavity 100, or the second flow control unit 520 can make the oil in the second cavity 300 flow back into the third cavity 100. Thereby, the liquid level height of the oil in the third cavity 100 is increased to ensure that the fluid pump 400 can effectively contact the oil, thereby effectively reducing the air suction of the fluid pump 400, that is, reducing the air suction of the oil pump, ensuring that the oil can flow to the motor position, and improving the cooling effect on the motor.

[0043] In this application, the fluid flow rate from the first cavity 200 to the third cavity 100 is greater than the fluid flow rate from the third cavity 100 to the first cavity 200, and the fluid flow rate from the second cavity 300 to the third cavity 100 is greater than the fluid flow rate from the third cavity 100 to the second cavity 300.

[0044] For example, when the fluid control device is in an inclined state, that is, the fluid control device is inclined to the left or right. One of the first flow control unit 510 and the second flow control unit 520 is opened to make the oil 900 in the first cavity 200 flow back into the third cavity 100 or the oil 900 in the second cavity 300 flow back into the third cavity 100.

[0045] For example, the fluid control device tilts to the right. At this time, the left side of the fluid control device is higher and the right side is lower. The oil 900 will accumulate on the right side, and the liquid level of the oil 900 in the third cavity 100 may drop below the fluid pump 400. At this time, the first flow control unit 510 is opened, and the second flow control unit 520 is closed. The first cavity 200 is connected to the third cavity 100, and the second cavity 300 is disconnected from the third cavity 100. The oil 900 in the first cavity 200 will accelerate and flow back to the third cavity 100 through the first flow control unit 510, and the oil 900 in the third cavity 100 will not flow to the second cavity 300. Thus, the oil 900 in the third cavity 100 will increase. Even if the oil 900 in the third cavity 100 tilts to the right, it can ensure that the liquid level submerges the oil suction port of the fluid pump 400, ensuring sufficient supply of oil 900.

[0046] When the fluid control device tilts to the left, at this time, the left side of the fluid control device is lower and the right side is higher. The oil 900 will accumulate on the left side, and the liquid level of the oil 900 in the third cavity 100 may drop below the fluid pump 400. At this time, the first flow control unit 510 is closed, and the second flow control unit 520 is opened. The first cavity 200 is disconnected from the third cavity 100, and the second cavity 300 is connected to the third cavity 100. The oil 900 in the second cavity 300 will accelerate and flow back to the third cavity 100 through the second flow control unit 520, and the oil 900 in the third cavity 100 will not flow to the first cavity 200. Thus, the oil 900 in the third cavity 100 will increase. Even if the oil 900 in the third cavity 100 tilts to the left, it can ensure that the liquid level submerges the oil suction port of the fluid pump 400, ensuring sufficient supply of oil 900.

[0047] When the liquid level of the oil 900 in the third cavity 100 is relatively low, the fluid flow rate from the third cavity 100 to the first cavity 200 can be controlled to be zero, and the fluid flow rate from the third cavity 100 to the second cavity 300 can be controlled to be zero. At this time, the third cavity 100 basically stops supplying oil to the first cavity 200 or the second cavity 300, or stops supplying oil to the first cavity 200 and the second cavity 300 simultaneously, ensuring that there is enough oil in the third cavity 100 and reducing the situation of air suction.

[0048] While reducing the air suction of the fluid pump 400, it can also avoid the idling of the fluid pump 400, improving the service life of the fluid pump 400. Moreover, sufficient supply of oil 900 can also ensure sufficient lubrication of the mechanical transmission components of the electric drive system, and can also improve the overall service life of the electric drive system.

[0049] To further avoid the situation where the oil fluid 900 in the third cavity 100 flows into the first cavity 200 or the second cavity 300, the first flow control unit 510 includes a passive control valve or an active control valve, and the second control unit includes a passive control valve or an active control valve. The passive control valve drives the valve core to open or close through its own fluid pressure, and the active control valve actively drives the valve core to open or close through a power source. That is to say, the first flow control unit 510 and the second flow control unit 520 can each have two control methods, namely active control or passive control, and the control method is more flexible.

[0050] The passive control valve is a spherical check valve, a rotary check valve or a flap check valve, and the control process of the passive control valve is simple. The active control valve is an electromagnetic one-way valve, a piezoelectric one-way valve or a hydraulic one-way valve, and the operability of the active control valve is stronger, and it can actively adjust according to the specific liquid level situation.

[0051] For example, both the first flow control unit 510 and the second flow control unit 520 are one-way valves. The conduction direction of the first flow control unit 510 is from the first cavity 200 to the third cavity 100, and the conduction direction of the second flow control unit 520 is from the second cavity 300 to the third cavity 100.

[0052] Through the setting of the one-way valve, the oil fluid 900 in the first cavity 200 can only flow into the third cavity 100, and the oil fluid 900 in the second cavity 300 can also only flow into the third cavity 100, avoiding the reverse flow of the oil fluid 900 in the third cavity 100 into the first cavity 200 and the second cavity 300, and improving the storage effect of the oil fluid 900 in the third cavity 100. Considering the pumping situation of the oil fluid 900 by the fluid pump 400, in the third cavity 100, more oil fluid 900 enters and less goes out, thereby increasing the storage capacity of the oil fluid 900.

[0053] In addition, through the setting of the one-way valve, even if the first flow control unit 510 and the second flow control unit 520 are opened, the oil fluid 900 will only flow unidirectionally from the first cavity 200 to the third cavity 100 and from the second cavity 300 to the third cavity 100, and it can also avoid the reverse flow of the oil fluid 900 in the third cavity 100.

[0054] In this application, after the oil fluid 900 completes a cycle, impurities may precipitate on the inner wall of the cavity or at the mechanical friction position, etc., and impurities may also be mixed in from the outside, which will affect the operation of the fluid pump 400. For this reason, the fluid control device further includes a filter 600. The filter 600 is provided in the third cavity 100, the filter 600 is connected to the input end of the fluid pump 400, and the filter 600 is used to filter the fluid in the third cavity 100 and then transport it to the fluid pump 400.

[0055] Generally, the filter 600 is disposed on the bottom surface side of the fluid pump 400 facing the third cavity 100, that is, the filter 600 is disposed on the side of the fluid pump 400 facing the oil fluid 900. The filter 600 can filter the oil fluid 900 entering the fluid pump 400, adsorb impurities, and reduce the influence on the operation of the fluid pump 400. In this application, the number of fluid pumps 400 is one, and the number of filters 600 is one. The number of fluid pumps 400 and filters 600 is set one-to-one.

[0056] In addition, a filter 600 can also be provided at the outlet position of the fluid pump 400 to ensure that the oil fluid 900 discharged from the fluid pump 400 can also be filtered.

[0057] In order to make full use of the position space, the third cavity 100 has a first outer side wall 111 facing the first cavity 200. The first cavity 200 and the third cavity 100 share the first outer side wall, and the first flow control unit 510 is disposed on the first outer side wall 111; the formation of the first cavity 200 makes full use of the structure of the third cavity 100, reduces the setting of one side wall surface of the first cavity 200, compresses the position space occupied by the first cavity 200, and can also save materials.

[0058] The third cavity 100 has a second outer side wall 112 facing the second cavity 300. The second cavity 300 and the third cavity 100 share the second outer side wall, and the second flow control unit 520 is disposed on the second outer side wall 112. The formation of the second cavity 300 also makes full use of the structure of the third cavity 100, reduces the setting of one side wall surface of the second cavity 300, compresses the position space occupied by the second cavity 300, and can also save materials.

[0059] In addition, the third cavity 100, the first cavity 200, and the second cavity 300 can be separate housing structures and assembled together by welding, or the three can be integrally provided. The materials of the third cavity 100, the first cavity 200, and the second cavity 300 can be aluminum alloy, or die-cast from cast iron, stainless steel, etc.

[0060] In order to facilitate the return of the oil fluid 900, the third cavity 100 is an oil sump. When the electric drive system is in a balanced state, the bottom surface of the third cavity 100 is lower than the bottom surfaces of the first cavity 200 and the second cavity 300. The function of the oil sump is to serve as the outer shell of the oil storage tank. Usually, the oil sump is sealed to prevent impurities from entering. The oil sump can collect and store the returned lubricating oil, dissipate heat, and prevent the lubricating oil from being oxidized. The oil sump is generally located at the lower part of the motor or the engine and is usually detachably provided.

[0061] As can be seen from the above, the bottom surface of the third cavity 100 is at a lower position. In the equilibrium state, that is, when the electric drive system is in a horizontal position without tilting left or right, the bottom surfaces of the first cavity 200 and the second cavity 300 are higher than the bottom surface of the third cavity 100. Under the action of gravity, the hydraulic oil 900 in the first cavity 200 and the hydraulic oil 900 in the second cavity 300 have higher potential energy and will actively flow towards the third cavity 100 located at a lower position.

[0062] The present application also provides an electric drive system, which includes a first motor 810, a second motor 820, and a fluid control device. The first motor 810 is disposed in the first cavity 200, the second motor 820 is disposed in the second cavity 300, and the fluid pump 400 pumps the fluid in the third cavity 100 to the first cavity 200 to cool the first motor 810 and pumps it to the second cavity 300 to cool the second motor 820.

[0063] When the first motor 810 and the second motor 820 are working, they will generate heat and there will also be mechanical friction.

[0064] The electric drive system further includes a first oil spray pipe 710 and a second oil spray pipe 720. Both the first oil spray pipe 710 and the second oil spray pipe 720 are connected to the fluid pump 400. The first oil spray pipe 710 extends from the fluid pump 400 towards the first cavity 200, and the second oil spray pipe 720 extends from the fluid pump 400 towards the second cavity 300. When the fluid pump 400 is working, the hydraulic oil 900 is pumped into the first oil spray pipe 710 through the fluid pump 400 and sprays towards the first motor 810 in the first cavity 200 along the first oil spray pipe 710. The hydraulic oil 900 passing through the first oil spray pipe 710 sprays onto the first motor 810, and heat exchange occurs between the hydraulic oil 900 and the first motor 810, taking away the heat of the first motor 810. At the same time, it can also lubricate the mechanical parts such as the bearings, power output shafts, and power input shafts of the first motor 810. After completing the heat exchange and lubrication, the hydraulic oil 900 flows back into the first cavity 200.

[0065] To cool the first motor 810 in the first cavity 200. The fluid pump 400 can also pump the hydraulic oil 900 into the second oil spray pipe 720 and spray it towards the second cavity 300 along the second oil spray pipe 720.

[0066] Spray onto the second motor 820. The hydraulic oil 900 passing through the second oil spray pipe 720 sprays onto the second motor 820, and heat exchange occurs between the hydraulic oil 900 and the second motor 820, taking away the heat of the second motor 820. At the same time, it can also lubricate the mechanical parts such as the bearings, power output shafts, and power input shafts of the second motor 820 to cool the second motor 820 in the second cavity 300.

[0067] The oil 900 sprayed into the first cavity 200 can automatically flow back to the bottom of the first cavity 200 after completing cooling and lubrication, and then flow back to the third cavity 100 through the first flow control unit 510. The oil 900 sprayed into the second cavity 300 can also automatically flow back to the bottom of the second cavity 300 after completing cooling and lubrication, and then flow back to the third cavity 100 through the second flow control unit 520. It can be seen from this that the oil 900 in the electric drive system forms a complete loop, and the oil 900 can be recycled, reducing the replenishment of the oil 900.

[0068] To reduce the pipeline arrangement, the electric drive system in this application further includes a common pipeline 730. One end of the common pipeline 730 is connected to the fluid pump 400, and the other end is respectively connected to the first spray pipe 710 and the second spray pipe 720. The common pipeline 730 bifurcates at one end far from the fluid pump 400 to form two connection ports. One connection port is connected to the first spray pipe 710, and the other connection port is connected to the second spray pipe 720. By setting the common pipeline 730 on the common path where the fluid pump 400 is connected to the first spray pipe 710 and the second spray pipe 720, the pipeline arrangement is reduced.

[0069] Refer to Figure 5 As shown, the electric drive system further includes a controller 530 and an attitude sensor 540. The controller 530 is connected to the attitude sensor 540. The controller 530 is also respectively connected to the first flow control unit 510 and the second flow control unit 520. The attitude sensor 540 is used to detect the attitude of the electric drive system. The controller 530 controls the on / off states of the first flow control unit 510 and the second flow control unit 520 based on the attitude of the electric drive system.

[0070] The attitude sensor 540 can also be understood as an inclination sensor. The inclination sensor is also known as an inclinometer, clinometer, level gauge, or tilt meter, and is often used to measure the change in the horizontal angle of a system.

[0071] The specific control process for the electric drive system can be that the attitude sensor 540 detects the inclination state of the electric drive system or the vehicle. When it detects that the vehicle is inclined, it can determine whether the vehicle is inclined to the right or to the left.

[0072] For example, after detecting that the vehicle is inclined to the right, the attitude sensor 540 feeds back the signal of the vehicle's right inclination to the controller 530. The controller 530 generates a first control signal and sends the first control signal to the first flow control unit 510. The first flow control unit 510 is turned on and conducted based on the first control signal, so that the oil 900 in the first cavity 200 flows back to the third cavity 100 through the first flow control unit 510.

[0073] When it is detected that the vehicle is tilting to the left, the attitude sensor 540 feeds back the signal of the vehicle tilting to the left to the controller 530. The controller 530 generates a second control signal and sends the second control signal to the second flow control unit 520. The second flow control unit 520 is turned on based on the second control signal, so that the oil 900 in the second cavity 300 flows back to the third cavity 100 through the second flow control unit 520.

[0074] In one embodiment of the present application, the electric drive system is a distributed electric drive system, wherein a first motor 810 is in transmission connection with a first wheel of the vehicle and is used to control the movement and steering of the first wheel, and a second motor 820 is in transmission connection with a second wheel of the vehicle and is used to control the movement and steering of the second wheel, wherein the first wheel and the second wheel are located on opposite sides of the vehicle's forward direction. In this embodiment, the vehicle is front-wheel drive. Alternatively, rear-wheel drive or four-wheel drive may be used.

[0075] In one embodiment of the present application, the electric drive system further includes a third motor, a fourth motor, and another fluid control device. The third motor is disposed within the first cavity 200 of the other fluid control device, and the fourth motor is disposed within the second cavity 300 of the other fluid control device. The fluid pump 400 of the other fluid control device pumps the fluid in the third cavity 100 to the first cavity 200 to cool the third motor, and pumps the fluid to the second cavity 300 to cool the fourth motor. In this embodiment, two fluid control devices can be provided, and the two fluid control devices can operate independently, providing a more independent and flexible control method.

[0076] In one embodiment of the present application, the electric drive system is a distributed four-wheel drive, the third motor is connected to the third wheel of the vehicle and is used to control the movement and steering of the third wheel, the fourth motor is connected to the fourth wheel of the vehicle and is used to control the movement and steering of the fourth wheel, wherein the third wheel and the fourth wheel are located on opposite sides of the vehicle's forward direction, the first wheel and the third wheel are located on the same side of the vehicle's forward direction, and the second wheel and the fourth wheel are located on the same side of the vehicle's forward direction.

[0077] In order to ensure the cooling effect of the electric drive system,

[0078] It should be noted that in the present application, in order to improve the oil return effect, two return fluid pumps 400 can also be set, namely a first return fluid pump 400 and a second return fluid pump 400. The first return fluid pump 400 is arranged in the first cavity 200, and the second return fluid pump 400 is arranged in the second cavity 300. The first return fluid pump 400 can pump the oil 900 in the first cavity 200 back to the third cavity 100, and the second return fluid pump 400 can pump the oil 900 in the second cavity 300 back to the third cavity 100.

[0079] For example, when the electric drive system tilts to the right, with the left side of the electric drive system higher than the right side, the oil 900 will accumulate on the right side, and the liquid level of the oil 900 in the third cavity 100 may drop below the fluid pump 400. At this time, the attitude sensor 540 detects the right tilt of the electric drive system, and the attitude sensor 540 feeds back the signal of the right tilt to the controller 530. The controller 530 generates a first control signal and sends the first control signal to the first flow control unit 510, and at the same time, also sends the first control signal to the second return fluid pump 400. The first flow control unit 510 is turned on and conducted, and the second return fluid pump 400 starts to operate. The first cavity 200 is connected to the third cavity 100, and the oil 900 in the first cavity 200 will flow back to the third cavity 100 through the first flow control unit 510. At the same time, through the operation of the second return fluid pump 400, the oil 900 in the second cavity 300 is also pumped back to the third cavity 100, so that the oil 900 in the third cavity 100 will increase, ensuring sufficient supply of oil 900.

[0080] For another example, when the electric drive system tilts to the left, with the left side of the electric drive system lower than the right side, the oil 900 will accumulate on the left side, and the liquid level of the oil 900 in the third cavity 100 may drop below the fluid pump 400. At this time, the attitude sensor 540 detects the left tilt of the electric drive system, and the attitude sensor 540 feeds back the signal of the left tilt to the controller 530. The controller 530 generates a second control signal and sends the second control signal to the second flow control unit 520, and at the same time, also sends the second control signal to the first return fluid pump 400. The second flow control unit 520 is turned on and conducted, and the first return fluid pump 400 starts to operate. The second cavity 300 is connected to the third cavity 100, and the oil 900 in the second cavity 300 will flow back to the third cavity 100 through the second flow control unit 520. At the same time, through the operation of the first return fluid pump 400, the oil 900 in the first cavity 200 is also pumped back to the third cavity 100, so that the oil 900 in the third cavity 100 will increase, and it can also ensure sufficient supply of oil 900.

[0081] It can be seen from this that on the basis of the one-way valve, with the setting of the return fluid pump 400, the oil return effect to the third cavity 100 can be further improved, and the oil 900 can be accelerated to flow back.

[0082] This application also provides a vehicle, which includes a chassis and an electric drive system. The chassis forms an installation space, and the electric drive system is arranged in the installation space.

[0083] For other specific implementation manners and beneficial effects of the vehicle, reference can be made to the above solution of the electric drive system, which will not be elaborated here.

[0084] Other embodiments of the present application will be readily contemplated by those skilled in the art after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application, which follow the general principles of the present application and include known common general knowledge or conventional technical means in the technical field not disclosed in the present application.

[0085] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present application is only limited by the appended claims.

Claims

1. A fluid control device, characterized in that, The fluid control device includes a first cavity, a second cavity, a third cavity, and a fluid pump. The third cavity is disposed between the first cavity and the second cavity; A first flow control unit is provided between the first cavity and the third cavity. The first flow control unit communicates the first cavity and the third cavity. The first flow control unit is configured to control the flow of fluid between the first cavity and the third cavity and make the fluid flow rate from the first cavity to the third cavity different from the fluid flow rate from the third cavity to the first cavity; A second flow control unit is provided between the second cavity and the third cavity. The second flow control unit communicates the second cavity and the third cavity. The second flow control unit is configured to control the flow of fluid between the second cavity and the third cavity and make the fluid flow rate from the second cavity to the third cavity different from the fluid flow rate from the third cavity to the second cavity; The fluid pump is disposed in the third cavity and is configured to pump the fluid in the third cavity to the first cavity and the second cavity.

2. The fluid control device according to claim 1, characterized in that, The fluid flow rate from the first cavity to the third cavity is greater than the fluid flow rate from the third cavity to the first cavity, and the fluid flow rate from the second cavity to the third cavity is greater than the fluid flow rate from the third cavity to the second cavity.

3. The fluid control device according to claim 1, wherein The fluid flow rate from the third cavity to the first cavity is zero, and the fluid flow rate from the third cavity to the second cavity is zero.

4. The fluid control device according to claim 1, wherein, The first flow control unit includes a passive control valve or an active control valve. The second control unit includes a passive control valve or an active control valve. The passive control valve drives the valve core to open or close through its own fluid pressure, and the active control valve actively drives the valve core to open or close through a power source.

5. The fluid control device according to claim 4, characterized in that, The passive control valve is a ball check valve, a rotary check valve, or a flap check valve.

6. The fluid control device according to claim 4, characterized in that, The active control valve is an electromagnetic one-way valve, a piezoelectric one-way valve, or a hydraulic one-way valve.

7. The fluid control device according to claim 1, characterized in that, It further includes a filter. The filter is disposed in the third cavity. The filter is connected to the input end of the fluid pump. The filter is configured to filter the fluid in the third cavity and then transport it to the fluid pump.

8. The fluid control device according to claim 1, wherein The number of the fluid pumps is one, and the number of the filters is one.

9. An electric drive system, characterized in that, The electric drive system includes a first motor, a second motor, and a fluid control device as described in any one of claims 1-8 above. The first motor is disposed in the first cavity, the second motor is disposed in the second cavity, and the fluid pump pumps the fluid in the third cavity to the first cavity to cool the first motor and pumps it to the second cavity to cool the second motor.

10. The electric drive system according to claim 9, wherein, It also includes a controller and a posture sensor, the controller is connected to the posture sensor, and the controller is also connected to the first flow control unit and the second flow control unit respectively. The posture sensor is used to detect the posture of the electric drive system, and the controller controls the opening or closing state of the first flow control unit and the second flow control unit based on the posture of the electric drive system.

11. The electric drive system according to claim 9 or 10, characterized in that, When the electric drive system is in a horizontal state, the first flow control unit and the second flow control unit are located on the same horizontal plane, and the bottom surface of the third cavity is lower than the bottom surfaces of the first cavity and the second cavity.

12. The electric drive system according to claim 9 or 10, characterized in that, The electric drive system is a distributed electric drive, the first motor is connected to the first wheel of the vehicle and is used to control the movement and steering of the first wheel, the second motor is connected to the second wheel of the vehicle and is used to control the movement and steering of the second wheel, wherein the first wheel and the second wheel are located on opposite sides of the vehicle's forward direction.

13. The electric drive system according to claim 12, wherein The electric drive system also includes a third motor, a fourth motor, and another fluid control device as described in any one of claims 1 to 8 above, wherein the third motor is arranged in the first cavity of the other fluid control device, and the fourth motor is arranged in the second cavity of the other fluid control device. The fluid pump of the other fluid control device pumps the fluid in the third cavity to the first cavity to cool the third motor, and pumps the fluid to the second cavity to cool the fourth motor.

14. The electric drive system according to claim 13, characterized in that, The electric drive system is a distributed four-wheel drive, the third motor is connected to the third wheel of the vehicle and is used to control the movement and steering of the third wheel, the fourth motor is connected to the fourth wheel of the vehicle and is used to control the movement and steering of the fourth wheel, wherein the third wheel and the fourth wheel are located on opposite sides of the vehicle's forward direction, the first wheel and the third wheel are located on the same side of the vehicle's forward direction, and the second wheel and the fourth wheel are located on the same side of the vehicle's forward direction.

15. A vehicle, characterized in that, The electric drive system comprises a chassis and the electric drive system according to any one of claims 9 to 14, wherein the chassis forms an installation space, and the electric drive system is arranged in the installation space.

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