Hydraulic system, suspension assembly and vehicle

Abstract

The present invention provides a hydraulic system, a suspension assembly and a vehicle, which relate to the field of automobile technology. The hydraulic system comprises: a hydraulic cylinder and a hydraulic pump, wherein the hydraulic cylinder comprises a first cavity and a second cavity which are isolated from each other; the first cavity is connected to the hydraulic pump through a first branch, and the second cavity is connected to the hydraulic pump through a second branch, and at least one of the first branch and the second branch can be controlled to be on and off. The oil can flow directionally between the first cavity and the second cavity through a channel formed by the first branch, the second branch and the hydraulic pump. When at least one of the first branch and the second branch is disconnected, the oil cannot flow directionally between the first cavity and the second cavity through a channel formed by the first branch, the second branch and the hydraulic pump. That is, the oil can be controlled not to flow through the hydraulic pump, thereby avoiding the reduction in the pressure of the oil caused by the oil flowing through the hydraulic pump and being diverted, thereby avoiding the reduction in the damping force on the oil, and thus enhancing the damping effect of the oil on the piston.

Description

Technical Field

[0001] The present invention relates to the technical field of automobiles, and in particular to a hydraulic system, a suspension assembly and a vehicle. Background Art

[0002] When driving, a car may encounter uneven roads, which may cause the car body to vibrate in the up and down directions relative to the road surface. In order to reduce the amplitude of this vibration and provide the driver and passengers with a better driving experience, an active hydraulic suspension system can be installed on the vehicle.

[0003] In the prior art, the active hydraulic suspension system includes a motor, a bidirectional hydraulic pump, a cylinder and a damping valve. The piston assembly is arranged in the cylinder, and the cylinder is divided into an upper chamber and a lower chamber in the vertical direction. The bidirectional hydraulic pump connects the upper chamber with the lower chamber through a first circuit, and the damping valve is arranged between the upper chamber and the lower chamber and connects the upper chamber with the lower chamber through a second circuit.

[0004] However, when the active hydraulic suspension system is in the damping adjustment state, the above-mentioned first circuit and second circuit exist at the same time, so that part of the hydraulic oil will flow through the two-way hydraulic pump, resulting in a reduction in the pressure difference at both ends of the damping valve, thereby causing the damping force of the active hydraulic suspension system to decay, so it cannot meet the specified damping force requirements. Summary of the invention

[0005] In view of this, the present invention provides a hydraulic system, a suspension assembly and a vehicle, wherein the first cavity of the hydraulic system is connected to the hydraulic pump through a first branch, the second cavity is connected to the hydraulic pump through a second branch, and at least one of the first branch and the second branch can be controlled to be on and off. In this way, the oil can be controlled not to flow through the hydraulic pump, thereby avoiding the reduction in the pressure of the oil caused by the oil flowing through the hydraulic pump and being diverted, thereby avoiding the reduction in the damping force on the oil, and thus enhancing the damping effect of the oil on the piston.

[0006] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0007] In a first aspect, the present invention discloses a hydraulic system, which includes: a hydraulic cylinder and a hydraulic pump, wherein the hydraulic cylinder includes a first cavity and a second cavity that are isolated from each other; the first cavity is connected to the hydraulic pump through a first branch, and the second cavity is connected to the hydraulic pump through a second branch, and at least one of the first branch and the second branch can be controlled to be on and off.

[0008] Optionally, both the first branch and the second branch are provided with an on-off control element, the on-off control element on the first branch is used to control the on-off of the first branch, and the on-off control element on the second branch is used to control the on-off of the second branch.

[0009] Optionally, the on-off control element is a switch valve.

[0010] Optionally, the switch valve is a two-way valve.

[0011] Optionally, the first branch and / or the second branch is provided with an energy storage device, and the energy storage device is used to absorb pressure pulsation caused by fluctuation of oil.

[0012] Optionally, the energy storage device includes a cylinder and an elastic buffer, and the elastic buffer is accommodated in the cylinder; when the fluctuating oil flows into the cylinder, the elastic buffer can be expanded and contracted along the axial direction of the cylinder.

[0013] Optionally, the elastic buffer includes a bellows, a sealing cover and a guide ring, the bellows is coaxially arranged with the cylinder, the first end of the bellows abuts against the inner wall of the cylinder, the edge of the second end of the bellows is sealingly connected to the sealing cover, and the guide ring is sleeved on the edge of the second end of the bellows and is slidably connected to the inner wall of the cylinder.

[0014] Optionally, the elastic buffer member further includes a buffer block, and the buffer block is fixedly connected to the outer surface of the sealing cover.

[0015] Optionally, a main circuit is connected between the first cavity and the second cavity, and when oil flows in the main circuit, the first branch and / or the second branch can be disconnected.

[0016] Optionally, the hydraulic system can be switched between a first working mode and a second working mode; when the hydraulic system is in the first working mode, at least one of the first branch and the second branch is disconnected, and the oil flows between the first cavity and the second cavity through the main circuit; when the hydraulic system is in the second working mode, both the first branch and the second branch are connected, and the oil flows between the first cavity and the second cavity through the main circuit.

[0017] Optionally, the main circuit includes a first circuit and a second circuit arranged in parallel.

[0018] Optionally, the first circuit controls the oil to flow from the first cavity to the second cavity, and the second circuit controls the oil to flow from the second cavity to the first cavity.

[0019] Optionally, a first flow guide is provided on the first circuit, and a second flow guide is provided on the second circuit, and the first flow guide and the second flow guide are used to control the directional flow of oil.

[0020] Optionally, the first flow guide member and the second flow guide member are both one-way valves.

[0021] Optionally, a first damping member is provided on the first circuit, and a second damping member is provided on the second circuit, and oil is hindered when flowing through the first damping member and the second damping member.

[0022] Optionally, both the first damping member and the second damping member are damping valves.

[0023] Optionally, the opening of the damping valve is adjustable.

[0024] Optionally, the main circuit is provided with an energy absorbing device, and the energy absorbing device is used to absorb pressure pulsation caused by fluctuation of oil.

[0025] Optionally, the energy absorption device includes an outer shell and a partition, wherein the partition is located inside the outer shell and is used to separate the inner cavity of the outer shell into a gas cavity and a liquid cavity isolated from each other, wherein the gas cavity stores gas and the liquid cavity is saturated with oil. The partition can move relative to the outer shell, and the liquid cavity is connected to the main circuit.

[0026] Optionally, the partition is slidably connected to the inner wall of the shell.

[0027] Optionally, the hydraulic pump includes a motor and an impeller, the rotating shaft of the motor is connected to the impeller, and the motor is used to control the start or shut down of the hydraulic pump.

[0028] Optionally, the motor may maintain a zero speed state.

[0029] Optionally, the hydraulic pump further comprises a detector and a controller; the detector is electrically connected to the impeller, and the controller is electrically connected to the detector and the motor respectively;

[0030] The detector is used to detect the data of the passive speed, the acceleration of the passive speed and the pressure of the oil generated by the impeller due to the fluctuation of the oil, and transmit the data to the controller;

[0031] After receiving the data, the controller analyzes the data to obtain corresponding road excitation conditions, and transmits the road excitation conditions in the form of a control signal to the motor; after receiving the control signal, the motor outputs a feedforward torque opposite to the passive torque through the rotating shaft, and the size and direction of the feedforward torque can be adjusted in real time according to the passive speed and the acceleration of the passive speed to keep the motor in a zero speed state.

[0032] In a second aspect, the present invention discloses a suspension assembly, which includes the hydraulic system described in any one of the first aspects.

[0033] In a third aspect, the present invention discloses a vehicle, comprising the suspension assembly described in the second aspect.

[0034] Compared with the related art, the beneficial effects of the present application are at least:

[0035] Since the hydraulic cylinder includes a cylinder body and a piston, the outer wall of the piston is attached to the inner wall of the cylinder body, and the inner cavity of the hydraulic cylinder is divided into a first cavity and a second cavity which are isolated from each other, and the first cavity and the second cavity are saturated with oil. When the piston moves in a directional manner in the cylinder body, the volume of the first cavity and the second cavity can be changed, and when the volume of one of the first cavity and the second cavity is reduced, the oil inside is squeezed, and then a damping force can be applied to the piston to hinder the directional movement of the piston, so that the piston can be damped.

[0036] Then, since the first cavity is connected to the hydraulic pump through the first branch, and the second cavity is connected to the hydraulic pump through the second branch, when the first branch and the second branch are both connected, the oil can flow directionally between the first cavity and the second cavity through the channel formed by the first branch, the second branch and the hydraulic pump, wherein the hydraulic pump provides the oil with power for directional flow.

[0037] Next, since at least one of the first branch and the second branch can be controlled to be on and off, when at least one of the first branch and the second branch is disconnected, the oil cannot flow directionally between the first cavity and the second cavity through the channel formed by the first branch, the second branch and the hydraulic pump. That is, the oil can be controlled not to flow through the hydraulic pump, thereby avoiding the reduction in the pressure of the oil caused by the oil flowing through the hydraulic pump and being diverted, thereby avoiding the reduction in the damping force on the oil, and thus enhancing the damping effect of the oil on the piston. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0039] Figure 1 is a structural schematic diagram of a hydraulic system provided by an embodiment of the present invention;

[0040] Figure 2 yes Figure 1 The schematic diagram of the structure corresponding to the on-off valve of the hydraulic system in FIG. 1 is opened;

[0041] Figure 3 is a detailed structural diagram of another hydraulic system provided by an embodiment of the present invention;

[0042] Figure 4 yes Figure 3 A schematic diagram of the structure of the energy storage device;

[0043] Figure 5 yes Figure 3 Schematic diagram of the structure of the energy absorption device.

[0044] Description of reference numerals:

[0045] 1-hydraulic cylinder, 11-first cavity, 12-second cavity, 13-cylinder body, 14-piston, 15-piston rod, 2-hydraulic pump, 21-motor, 3-first branch, 4-second branch, 5-on-off control element, 6-energy storage device, 61-cylinder barrel, 62-elastic buffer, 621-bellows, 622-sealing cover, 623-guide ring, 624-buffer block, 63-sealing ring, 64-lower cover, 65-gas sealing cover, 7-main circuit, 71-first circuit, 711-first flow guide, 712-first damping member, 72-second circuit, 721-second flow guide, 722-second damping member, 8-energy absorption device, 81-housing, 82-partition, 83-gas chamber, 84-liquid chamber, 100-hydraulic system. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] The terms "first", "second", etc. in the specification and claims of the present invention are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0048] It should be understood that the reference to "some embodiments" throughout the specification means that specific features, structures or characteristics related to the embodiments are included in at least one embodiment of the present invention. Therefore, the "in some embodiments" that appear throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner.

[0049] A hydraulic system, a suspension assembly and a vehicle provided by the present invention are described in detail below by listing specific embodiments.

[0050] Figure 1is a structural schematic diagram of a hydraulic system 100 provided in an embodiment of the present invention. Figure 2 yes Figure 1 Schematic diagram of the structure corresponding to the switch valve of the hydraulic system 100 after it is opened.

[0051] See also Figure 1 and Figure 2 The hydraulic system 100 includes: a hydraulic cylinder 1 and a hydraulic pump 2, the hydraulic cylinder 1 includes a first cavity 11 and a second cavity 12 isolated from each other; the first cavity 11 is connected to the hydraulic pump 2 through a first branch 3, and the second cavity 12 is connected to the hydraulic pump 2 through a second branch 4, and at least one of the first branch 3 and the second branch 4 can be controlled to be on and off.

[0052] In the embodiment of the present application, the hydraulic cylinder 1 includes a cylinder body 13 and a piston 14. The outer wall of the piston 14 is attached to the inner wall of the cylinder body 13, and the inner cavity of the hydraulic cylinder 1 is divided into a first cavity 11 and a second cavity 12 which are isolated from each other. The first cavity 11 and the second cavity 12 are saturated with oil. When the piston 14 moves in a directional manner in the cylinder body 13, the volume of the first cavity 11 and the second cavity 12 can be changed. When the volume of one of the first cavity 11 and the second cavity 12 is reduced, the oil inside is squeezed, and then a damping force can be applied to the piston 14 to hinder the directional movement of the piston 14, so that the piston 14 can have a damping effect.

[0053] Next, since the first cavity 11 is connected to the hydraulic pump 2 through the first branch 3, and the second cavity 12 is connected to the hydraulic pump 2 through the second branch 4, when the first branch 3 and the second branch 4 are both connected, the oil can flow directionally between the first cavity 11 and the second cavity 12 through the channel formed by the first branch 3, the second branch 4 and the hydraulic pump 2, wherein the hydraulic pump 2 provides the oil with power for directional flow.

[0054] Next, since at least one of the first branch 3 and the second branch 4 can be controlled to be on and off, when at least one of the first branch 3 and the second branch 4 is disconnected, the oil cannot flow directionally between the first cavity 11 and the second cavity 12 through the channel formed by the first branch 3, the second branch 4 and the hydraulic pump 2. That is, the oil can be controlled not to flow through the hydraulic pump 2, thereby avoiding the reduction in the pressure of the oil caused by the oil flowing through the hydraulic pump 2 and being diverted, thereby avoiding the reduction in the damping force on the oil, and thus enhancing the damping effect of the oil on the piston 14.

[0055] Furthermore, the hydraulic pump 2 may be a bidirectional hydraulic pump 2 , which can alternately provide opposite directions of power to the oil, thereby enabling the piston 14 to reciprocate in the cylinder 13 .

[0056] It should be noted that the damping force on the piston 14 is equal to the product of the pressure of the oil and the area of ​​a single plane in contact with the piston 14 and the oil.

[0057] Optionally, in some embodiments, see Figure 1 and Figure 2 The first branch 3 and the second branch 4 are both provided with an on-off control element 5. The on-off control element 5 on the first branch 3 is used to control the on-off of the first branch 3, and the on-off control element 5 on the second branch 4 is used to control the on-off of the second branch 4.

[0058] In this way, the on-off of the first branch 3 and the second branch 4 can be controlled by specific components, which is more convenient than other on-off control methods. The on-off control component 5 has two working states: on and off.

[0059] Furthermore, the working state of the on-off control element 5 can be controlled by the vehicle system. The vehicle system receives the road identification signal and then sends a control signal to the on-off control element 5 to switch the on-off control element 5 between the two working modes of opening and closing.

[0060] Optionally, in some embodiments, see Figure 1 and Figure 2 , the on-off control element 5 is a switch valve. Since the switch valve is a common on-off control element 5, its manufacturing and installation technology is relatively mature, which can improve the reliability of the hydraulic system 100. In addition, the switch valve has a lower manufacturing cost than other on-off control elements 5, which can reduce the manufacturing cost of the hydraulic system 100.

[0061] Optionally, in some embodiments, see Figure 1 and Figure 2 The switch valve is a two-way valve. Since the two-way valve has only one inlet and one outlet, that is, it has only one flow channel. Thus, when the switch valve is opened, the flow direction of the oil is clearer, thereby making the flow path of the oil simpler, thereby improving the reliability of the hydraulic system 100.

[0062] Optionally, in some embodiments, see Figure 1 and Figure 3 The first branch 3 and / or the second branch 4 is provided with an energy storage device 6, and the energy storage device 6 is used to absorb the pressure pulsation caused by the fluctuation of the oil.

[0063] Thus, when the oil flows in the first branch 3 or the second branch 4, the pressure pulsation caused by the fluctuation can be absorbed by the energy storage device 6. Then, when the oil flows through the accumulator, the flow rate becomes more stable. This can prevent the damping force on the piston 14 from fluctuating, and thus prevent the hydraulic system 100 from making abnormal gurgling noises.

[0064] It should be noted that the accumulator can be arranged only in the first branch 3, only in the second branch 4, or in both the first branch 3 and the second branch 4, which is not limited in the embodiment of the present application.

[0065] Optionally, in some embodiments, see Figure 1 , Figure 3 and Figure 4 The energy storage device 6 includes a cylinder 61 and an elastic buffer 62 , and the elastic buffer 62 is accommodated in the cylinder 61 ; when the fluctuating oil flows into the cylinder 61 , the elastic buffer 62 can be expanded and contracted along the axial direction of the cylinder 61 .

[0066] In this way, when the oil flows into the cylinder 61, the elastic buffer 62 can be compressed under the action of the fluctuation of the oil, and the elastic buffer 62 is repeatedly compressed. Since the compression process can absorb the energy generated by the fluctuation of the oil, when the oil flows into the first cavity 11 or the second cavity 12, it will not cause fluctuations in the piston 14, thereby avoiding fluctuations in the damping force on the piston 14 and avoiding gurgling noises in the hydraulic system 100.

[0067] It should be noted that the elastic buffer member 62 may be a bellows 621 or an airbag, or other elastic bodies with the same function, which is not limited in the embodiment of the present application.

[0068] Optionally, in some embodiments, see Figure 1 , Figure 3 and Figure 4 The elastic buffer 62 includes a bellows 621, a sealing cover 622 and a guide ring 623. The bellows 621 is coaxially arranged with the cylinder 61. The first end of the bellows 621 abuts against the inner wall of the cylinder 61. The edge of the second end of the bellows 621 is sealed and connected with the sealing cover 622. The guide ring 623 is sleeved on the edge of the second end of the bellows 621 and is slidably connected with the inner wall of the cylinder 61.

[0069] Since the bellows 621 is relatively easy to be compressed along its own axis, it is more sensitive to the fluctuation of the oil, that is, it can also absorb the weak pressure pulsation generated by the oil. Therefore, the bellows 621 is used as the elastic buffer 62 of the energy storage device 6. The pressure pulsation generated by the oil can be absorbed more thoroughly, which is more effective in avoiding the gurgling noise of the hydraulic system 100.

[0070] Next, since the guide ring 623 is sleeved on the edge of the second end of the bellows 621 and is slidably connected to the inner wall of the cylinder 61, the friction between the bellows 621 and the inner wall of the cylinder 61 is smaller, making the bellows 621 easier to be compressed, and further making the bellows 621 more sensitive to fluctuations in the oil.

[0071] Optionally, in some embodiments, see Figure 1 , Figure 3 and Figure 4 The elastic buffer 62 further includes a buffer block 624, which is fixedly connected to the outer surface of the sealing cover 622. The buffer block 624 is a solid body, and its mass is larger than that of the bellows 621. Since the edge of the second end of the bellows 621 is sealed and connected to the sealing cover 622, the buffer block 624 is fixedly connected to the outer surface of the sealing cover 622.

[0072] Thus, when the oil produces a wave effect on the bellows 621, the bellows 621 will be repeatedly compressed, and the buffer block 624 will be carried to reciprocate along the axis direction of the bellows 621. The buffer block 624 with a larger mass will absorb most of the energy, so it can more fully absorb the pressure pulsation caused by the oil fluctuation. In addition, the energy storage device 6 also includes a sealing ring 63, a lower cover 64 and an air sealing cover 65.

[0073] It should be noted that the buffer block 624 may be an iron block or an aluminum block, or a block made of other materials, which is not limited in the embodiment of the present application.

[0074] Optionally, in some embodiments, see Figure 1 , Figure 2 and Figure 3 A main circuit 7 is also connected between the first cavity 11 and the second cavity 12. When oil flows in the main circuit 7, the first branch 3 and / or the second branch 4 can be disconnected.

[0075] In this way, the oil can flow between the first cavity 11 and the second cavity 12, ensuring that there is a channel for the oil to flow between the first cavity 11 and the second cavity 12, so that the hydraulic system 100 can work normally.

[0076] Next, when oil flows in the main circuit 7, the first branch 3 can be disconnected, so that the oil can be controlled not to flow through the hydraulic pump 2, thereby avoiding the situation where the oil pressure is reduced due to the oil flowing through the hydraulic pump 2 and being diverted, thereby avoiding the reduction of the damping force on the oil, thereby enhancing the damping effect of the oil on the piston 14.

[0077] And / or, when oil flows in the main circuit 7, the second branch 4 can be disconnected, and the effect produced is the same as the above technical effect, so it will not be repeated here.

[0078] Optionally, in some embodiments, see Figure 1 , Figure 2 and Figure 3, the hydraulic system 100 can be switched between the first working mode and the second working mode; when the hydraulic system 100 is in the first working mode, at least one of the first branch 3 and the second branch 4 is disconnected, and the oil flows between the first cavity 11 and the second cavity 12 through the main circuit 7; when the hydraulic system 100 is in the second working mode, the first branch 3 and the second branch 4 are both connected, and the oil flows between the first cavity 11 and the second cavity 12 through the main circuit 7.

[0079] Among them, when the hydraulic system 100 is in the first working mode, at least one of the first branch 3 and the second branch 4 is disconnected, and the oil flows between the first cavity 11 and the second cavity 12 through the main circuit 7. At this time, the oil only flows between the first cavity 11 and the second cavity 12 through the main circuit 7, and does not pass through the hydraulic pump 2, thereby avoiding the situation where the oil pressure is reduced due to the oil flowing through the hydraulic pump 2 and being diverted, thereby avoiding the reduction of the damping force on the oil, thereby enhancing the damping effect of the oil on the piston 14.

[0080] When the hydraulic system 100 is in the second working mode, the first branch 3 and the second branch 4 are both connected, and the oil flows between the first cavity 11 and the second cavity 12 through the main circuit 7. At this time, the oil can flow between the first cavity 11 and the second cavity 12 not only through the main circuit 7, but also through the hydraulic pump 2. At this time, the oil flows through the hydraulic pump 2 and is diverted, so that the pressure of the oil is reduced, and then the damping force on the oil is reduced, so the damping effect of the oil on the piston 14 is reduced.

[0081] Since the on-off of the first branch 3 and the second branch 4 is controllable, the hydraulic system 100 can be switched between the first working mode and the second working mode, thereby increasing the application scope of the hydraulic system 100.

[0082] Optionally, in some embodiments, see Figure 1 , Figure 2 and Figure 3 The main circuit 7 includes a first circuit 71 and a second circuit 72 which are arranged in parallel.

[0083] In this way, when the oil flows between the first cavity 11 and the second cavity 12, there can be two flow paths. The flow directions of the oil in the two flow paths can be the same or opposite. Compared with a solution with only one flow path, the two flow paths can allow the oil to have multiple flow solutions, thereby further increasing the scope of application of the hydraulic system 100.

[0084] Optionally, in some embodiments, see Figure 1 , Figure 2 and Figure 3The first circuit 71 controls the oil to flow from the first cavity 11 to the second cavity 12 , and the second circuit 72 controls the oil to flow from the second cavity 12 to the first cavity 11 .

[0085] In this way, the path of the oil flowing from the first cavity 11 to the second cavity 12 and the path of the oil flowing from the second cavity 12 to the first cavity 11 are independent of each other and do not interfere with each other, and the directions of the oil flowing in the first circuit 71 and the second circuit 72 are opposite, thereby making the hydraulic system 100 more stable during operation and less prone to failure.

[0086] In addition, when the hydraulic system 100 is provided with the first circuit 71 and the second circuit 72 at the same time, the piston 14 is subjected to damping forces in two directions, and the directions of the two damping forces are opposite. Thus, when the piston 14 reciprocates inside the cylinder body 13, it can be subjected to a damping force opposite to its movement direction at any time.

[0087] It should be noted that some sections of the first loop 71 and the second loop 72 are combined to share one trunk section.

[0088] It should be noted that the first loop 71 and the second loop 72 may be metal tubes, composite material tubes, or other types of tubes, which is not limited in the embodiment of the present application.

[0089] It should also be noted that the above-mentioned oil can be petroleum-based hydraulic oil or high-water-based flame-resistant hydraulic oil, or other types of oil, which is not limited in the embodiments of the present application.

[0090] Optionally, in some embodiments, see Figure 1 , Figure 2 and Figure 3 A first flow guide 711 is provided on the first circuit 71, and a second flow guide 721 is provided on the second circuit 72. The first flow guide 711 and the second flow guide 721 are used to control the directional flow of oil.

[0091] In this way, the first flow guide 711 controls the liquid to flow from the first cavity 11 to the second cavity 12, ensuring that the oil flows from the first cavity 11 to the second cavity 12, and further ensuring that the oil can circulate normally when the piston 14 moves toward the first cavity 11. Similarly, the second flow guide 721 can control the oil to flow from the second cavity 12 to the first cavity 11, ensuring that the oil flows from the second cavity 12 to the first cavity 11, and further ensuring that the oil can circulate normally when the piston 14 moves toward the second cavity 12.

[0092] In addition, the first flow guide member 711 and the second flow guide member 721 are concrete objects, and are relatively simple and convenient to operate, thereby improving the control efficiency of the hydraulic system 100.

[0093] Optionally, in some embodiments, see Figure 1 , Figure 2 and Figure 3 , the first guide member 711 and the second guide member 721 are both one-way valves. Among them, when the oil flows through the one-way valve, it can only flow in from the inlet end of the one-way valve and flow out from the outlet end of the one-way valve. This ensures that the oil can flow in a directional manner in the first circuit 71 or the second circuit 72. When the first guide member 711 is a one-way valve, it can ensure that the oil flows from the first cavity 11 to the second cavity 12, so that when the piston 14 moves toward the direction of the first cavity 11, the oil can circulate normally. When the second guide member 721 is a one-way valve, it can ensure that the oil flows from the second cavity 12 to the first cavity 11, so that when the piston 14 moves toward the direction of the second cavity 12, the oil can circulate normally.

[0094] In addition, the one-way valve has a lower manufacturing cost than other on-off control elements 5 , which can reduce the manufacturing cost of the hydraulic system 100 .

[0095] It should be noted that the above-mentioned one-way valve can be a spring-type one-way valve, a gravity-type one-way valve or a swing-type one-way valve, or can be other types of one-way valves, which is not limited in the embodiments of the present application.

[0096] Optionally, in some embodiments, see Figure 1 , Figure 2 and Figure 3 A first damping member 712 is provided on the first circuit 71 , and a second damping member 722 is provided on the second circuit 72 . When the oil flows through the first damping member 712 and the second damping member 722 , it is hindered.

[0097] In the embodiment of the present application, since the first damping member 712 is provided on the first circuit 71, the oil is hindered when flowing through the first damping member 712. In this way, the first damping valve can hinder the normal flow of the oil, thereby increasing the pressure of the oil on the side close to the inlet end of the first damping valve, so that the damping force on the piston 14 can be further increased. Similarly, the second damping member 722 is provided on the second circuit 72, and its effect is the same as the above technical effect, so it is not repeated here.

[0098] Optionally, in some embodiments, see Figure 1 , Figure 2 and Figure 3 The first damping member 712 and the second damping member 722 are both damping valves. When the oil flows through the damping valve, the damping valve can hinder the normal flow of the oil, thereby increasing the pressure of the oil near the inlet end of the damping valve, so that the damping force on the piston 14 can be further increased.

[0099] In addition, the damping valve has a lower manufacturing cost than other damping components, which can reduce the manufacturing cost of the hydraulic system 100 .

[0100] It should be noted that the damping valve may be a magnetorheological damper or a mechanical damper, which is not limited in the present embodiment. When it is a mechanical damper, it may be a threaded damping valve or a butterfly check valve, which is not limited in the present embodiment.

[0101] Optionally, in some embodiments, see Figure 1 , Figure 2 and Figure 3 , the opening of the damping valve is adjustable.

[0102] Among them, the smaller the opening of the damping valve, the more difficult it is for the oil to flow through the damping valve, and the greater the pressure of the oil on the side close to the inlet end of the damping valve, so the greater the damping force on the piston 14. The larger the opening of the damping valve, the easier it is for the oil to flow through the damping valve, and the smaller the pressure of the oil on the side close to the inlet end of the damping valve, so the smaller the damping force on the piston 14. That is, the damping force on the piston 14 can be adjusted by adjusting the opening of the damping valve, so that the hydraulic system 100 can be applied to devices with different damping force requirements.

[0103] The opening of the damping valve is adjusted by the magnitude of the input current, which makes the opening of the damping valve more sensitive to adjust.

[0104] In addition, since the end of the damping valve away from the one-way valve is connected to one of the first cavity 11 and the second cavity 12, the end of the one-way valve away from the damping valve is connected to the other of the first cavity 11 and the second cavity 12. That is, the one-way valve and the damping valve are separately and independently arranged. In this way, when one of the one-way valve and the damping valve in the same control element fails, the function of the other is not affected, thereby making the performance of the hydraulic system 100 more stable.

[0105] Optionally, in some embodiments, see Figure 1 , Figure 3 and Figure 5 The main circuit 7 is provided with an energy absorbing device 8, which is used to absorb the pressure pulsation caused by the fluctuation of the oil.

[0106] Since the pressure pulsation generated by the oil after flowing through the energy storage device 6 is generally not completely absorbed by the energy storage device 6, the oil flowing through the main circuit 7 also has pressure pulsation. After the main circuit 7 is provided with the energy absorption device 8, the pressure pulsation not completely absorbed by the energy storage device 6 can be further absorbed.

[0107] The flow rate of the oil will become more stable after it flows through the energy absorbing device 8. This can further prevent the damping force on the piston 14 from fluctuating, thereby preventing the hydraulic system 100 from making abnormal gurgling noises.

[0108] Optionally, in some embodiments, see Figure 1 , Figure 3 and Figure 5 The energy absorption device 8 includes a shell 81 and a partition 82. The partition 82 is located inside the shell 81 and is used to separate the inner cavity of the shell 81 into a gas cavity 83 and a liquid cavity 84 that are isolated from each other. The gas cavity 83 stores gas, and the liquid cavity 84 is saturated with oil. The partition 82 can move relative to the shell 81, and the liquid cavity 84 is connected to the main circuit 7.

[0109] In this way, when the oil with pressure pulse flows through the energy absorbing device 8, it can push the partition 82 to move toward the gas chamber 83 and compress the gas. Under the action of the fluctuation of the oil, the partition 82 can move back and forth repeatedly in the inner cavity of the shell 81. The partition 82 compresses the gas once when it moves back and forth. In the process of compressing the gas, the partition 82 can absorb the energy carried by the pressure pulse. In this way, when the oil flows into the first cavity 11 or the second cavity 12, it will not produce a fluctuation effect on the piston 14, thereby avoiding the fluctuation of the damping force on the piston 14, and further avoiding the occurrence of gurgling noises in the hydraulic system 100.

[0110] When the oil flows through the energy absorbing device 8, if the pressure of the oil is high, it will push the partition 82 to move toward the gas chamber 83. During this movement, the pressure pulsation carried by the oil is absorbed by the energy absorbing device 8 due to work. When the pressure of the oil is low, the partition 82 will return to its original position, and can continue to absorb the pressure pulsation carried by the oil.

[0111] Furthermore, in order to adjust the size of the pressure pulsation that the energy absorbing device 8 can absorb, oil can be added to the liquid chamber 84 as required. In addition, the energy absorbing device 8 can also be an air bag filled with gas.

[0112] Optionally, in some embodiments, see Figure 1 , Figure 3 and Figure 5 , the partition 82 is slidably connected to the inner wall of the shell 81. In this way, the friction between the partition 82 and the inner wall of the shell 81 is smaller, making it easier for the partition 82 to move relative to the shell 81, and further making the partition 82 more sensitive to the fluctuation of the oil. Therefore, the energy absorbing device 8 can more fully absorb the pressure pulsation carried by the oil.

[0113] Optionally, in some embodiments, see Figure 1 , Figure 2 and Figure 3 The hydraulic pump 2 includes a motor 21 and an impeller. The rotating shaft of the motor 21 is connected to the impeller. The motor 21 is used to control the start or shut down of the hydraulic pump 2.

[0114] In the embodiment of the present application, when the motor 21 is started, the impeller can be driven to rotate, thereby enabling the oil to flow in a directional manner, and the hydraulic system 100 enters the active adjustment mode. When the motor 21 is turned off, the impeller stops actively rotating, and the hydraulic system 100 enters the damping force adjustment mode. Since the motor 21 has a more stable rotation speed than other drive devices, the directional flow speed of the oil is more uniform.

[0115] In the embodiment of the present application, since the motor 21 can be used to control the start or shut down of the hydraulic pump 2, the hydraulic system 100 has two working modes. When the hydraulic pump 2 is in the off state, the hydraulic system 100 is in the damping force adjustment mode. When the hydraulic pump 2 is in the on state, the hydraulic system 100 can be in the active adjustment mode, at which time the oil can flow between the first cavity 11 and the second cavity 12 under the driving action of the hydraulic pump 2, so that the damping force on the piston 14 is reduced, thereby reducing the damping effect of the oil on the piston 14.

[0116] Optionally, in some embodiments, see Figure 1 , Figure 2 and Figure 3 , the motor 21 can maintain a zero speed state.

[0117] In this way, the impeller will not rotate, and the oil will not flow between the first cavity 11 and the second cavity 12 through the first branch 3 and the second branch 4. That is, the oil can be controlled not to flow through the hydraulic pump 2, thereby avoiding the reduction of the oil pressure caused by the oil flowing through the hydraulic pump 2 and being diverted, thereby avoiding the reduction of the damping force on the oil, thereby enhancing the damping effect of the oil on the piston 14.

[0118] Optionally, in some embodiments, see Figure 1 , Figure 2 and Figure 3 , the hydraulic pump 2 also includes a detector and a controller; the detector is electrically connected to the impeller, and the controller is electrically connected to the detector and the motor 21 respectively;

[0119] The detector is used to detect the passive speed, acceleration of the passive speed and pressure of the oil generated by the impeller due to the oil fluctuation, and transmit the data to the controller;

[0120] After receiving the data, the controller analyzes the data to obtain the corresponding road excitation conditions, and transmits the road excitation conditions to the motor 21 in the form of a control signal; after receiving the control signal, the motor 21 outputs a feedforward torque opposite to the passive torque through the rotating shaft, and the size and direction of the feedforward torque can be adjusted in real time according to the passive speed and the acceleration of the passive speed to keep the motor 21 in a zero speed state.

[0121] Since the detector can detect the passive speed of the impeller due to oil fluctuations, the acceleration of the passive speed and the pressure of the oil, and transmit the data to the controller, it can provide a data basis for the final accurate output feedforward torque, so that the zero speed state of the motor 21 can be achieved more accurately and reliably. In addition, the automatic control of the zero speed of the motor 21 is realized, thereby improving the working efficiency of the hydraulic system 100.

[0122] The embodiment of the present application further discloses a suspension assembly, which includes any one of the hydraulic systems 100 described above.

[0123] The piston 14 of the hydraulic system 100 is fixedly connected to a piston rod 15, and the piston rod 15 extends out of the cylinder 13. The piston rod 15 is connected to the vehicle frame, and the end of the cylinder 13 opposite to the piston rod 15 is connected to the vehicle axle.

[0124] When the vehicle is traveling on a bumpy road, the hydraulic system 100 can be switched to a damping force adjustment mode. At this time, the hydraulic system 100 enhances the damping effect of the oil on the piston 14, thereby increasing the damping effect of the suspension assembly. This can reduce the amplitude of the vibration of the vehicle caused by the uneven road surface, thus providing a better driving experience for the driver and passengers. When the vehicle is traveling on a flat road, the hydraulic system 100 can be switched to an active adjustment mode.

[0125] In addition, the pressure fluctuations generated by the oil in the hydraulic system 100 are absorbed by the accumulator, which can avoid the occurrence of gurgling noises in the shock absorber installed with the suspension assembly, thereby ensuring the stability and reliability of the suspension assembly.

[0126] The embodiment of the present application also discloses a vehicle, which includes the above-mentioned suspension assembly. In this way, when the vehicle travels on a bumpy road section, the hydraulic system 100 can switch to a damping force adjustment mode. At this time, since the hydraulic system 100 enhances the damping effect of the oil on the piston 14, the damping effect of the suspension assembly is increased. In this way, the amplitude of the vibration of the vehicle caused by the uneven road surface can be reduced, so it can bring a better driving experience to the driver and passengers. When the vehicle travels on a flat road, the hydraulic system 100 can be switched to an active adjustment mode. In addition, the pressure fluctuations generated by the free rotation of the impeller of the hydraulic system 100 are absorbed by the accumulator. In this way, the shock absorber installed with the suspension assembly can be prevented from making a gurgling sound, thereby ensuring the stability and reliability of the suspension assembly.

[0127] The vehicle also includes a suspension controller, which is electrically connected to the motor 21 of the hydraulic pump 2, and can control the opening or closing of the motor 21 to switch the working state of the suspension assembly. When the vehicle's load, driving speed, road conditions and other driving conditions change, the sensor can first detect the change in driving conditions and feed the signal back to the suspension controller, and then the suspension controller issues an instruction to turn the motor 21 on or off, thereby switching the working state of the suspension assembly. In this way, the suspension assembly can be automatically adjusted, the vibration caused by uneven road surface can be reduced, and the ultimate control and absolute stability can be achieved. In addition, the suspension controller is also electrically connected to the above-mentioned damping valve to automatically control the opening of the damping valve.

[0128] It should be noted that the above-mentioned vehicle may be a sedan, an off-road vehicle or a bus, or other types of vehicles, which is not limited in the embodiments of the present application.

[0129] See also Figure 1 , Figure 2 and Figure 3 , a process of switching the working mode of a vehicle equipped with the above suspension assembly through a suspension controller is as follows:

[0130] When the car is driving on a bumpy road, the suspension controller analyzes the collected signals and determines that the system should be in the damping force adjustment working mode. At this time, the hydraulic system 100 is in the first working mode.

[0131] When at least one of the first branch 3 and the second branch 4 is disconnected, the oil flows between the first cavity 11 and the second cavity 12 through the main circuit 7. At this time, the oil only flows between the first cavity 11 and the second cavity 12 through the main circuit 7, and does not pass through the hydraulic pump 2, thereby avoiding the reduction of the oil pressure caused by the oil flowing through the hydraulic pump 2 and being diverted, thereby avoiding the reduction of the damping force on the oil, thereby enhancing the damping effect of the oil on the piston 14.

[0132] When the tire jumps, the oil in the second cavity 12 is squeezed, most of it flows through the second damping member 722, part of it enters the energy absorption device 8, and the other part flows through the second guide member 721 into the first cavity 11; a small part flows into the lower bellows accumulator to absorb the system pressure pulsation. By changing the input current to adjust the opening of the second damping member 722, the compression damping force in the damping force adjustment mode can be adjusted. At this time, the impeller of the hydraulic pump 2 does not rotate, and the oil in the second cavity 12 cannot flow through the hydraulic pump 2, so the attenuation of the damping force can be avoided. At the same time, the lower bellows accumulator absorbs the system pressure pulsation, and will not cause high-frequency pressure fluctuations in the system due to the speed fluctuations of the hydraulic pump 2, thereby avoiding the generation of gurgling noises.

[0133] When the tire jumps down, the oil in the first cavity 11 is squeezed, and most of the oil flows through the first damping member 712, and flows through the first guide member 711 together with the oil in the energy absorption device 8 to enter the second cavity 12; a small part of the oil flows into the upper bellows accumulator. The opening of the first damping member 712 is adjusted by changing the input current, and then the damping force in the damping force adjustment mode can be adjusted. At this time, the impeller of the hydraulic pump 2 does not rotate, and the oil in the first cavity 11 cannot flow through the hydraulic pump 2, so the attenuation of the damping force can be avoided. At the same time, the system pressure fluctuation will not be caused by the speed fluctuation of the hydraulic pump 2, thereby avoiding the shock absorber from producing gurgling noise. Among them, the bellows accumulator is a type of the above-mentioned energy storage device 6.

[0134] When the car is driving on a flat road. The suspension controller analyzes the collected signals and determines that the system should be in the active power adjustment working mode. At this time, when the hydraulic system 100 is in the second working mode, the first branch 3 and the second branch 4 are both connected, and the oil flows between the first cavity 11 and the second cavity 12 through the main circuit 7. At this time, the oil can not only flow between the first cavity 11 and the second cavity 12 through the main circuit 7, but also flow between the first cavity 11 and the second cavity 12 through the hydraulic pump 2. At this time, the oil flows through the hydraulic pump 2 and is diverted, which reduces the pressure of the oil, thereby reducing the damping force on the oil, thereby reducing the damping effect of the oil on the piston 14. When the hydraulic system 100 is in the second working mode, the motor 21 is in the on state.

[0135] When the suspension controller determines that the tire needs to jump up, the motor 21 drives the hydraulic pump 2, and a part of the oil flows into the first cavity 11, pushing the piston 14 to move downward, and the oil in the second cavity 12 of the hydraulic cylinder 1 is squeezed and flows back to the hydraulic pump 2. Another part of the oil flows through the first damping member 712 and enters the energy absorption device 8.

[0136] When the suspension controller determines that the tire needs to be pressed down, the motor 21 drives the hydraulic pump 2, and part of the oil flows into the second cavity 12, pushing the piston 14 to move upward, and the oil in the first cavity 11 is squeezed and flows back to the hydraulic pump 2. Another part of the oil flows through the second damping member 722 and the energy absorbing device 8, flows through the second guide member 721 together, and flows back to the hydraulic pump 2.

[0137] Since the on-off of the first branch 3 and the second branch 4 is controllable, the hydraulic system 100 can be switched between the first working mode or the second working mode, so the vehicle can be switched between the damping force adjustment working mode and the active force adjustment working mode.

[0138] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0139] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A hydraulic system (100), characterized in that: include: A hydraulic cylinder (1), the hydraulic cylinder (1) comprising a first cavity (11) and a second cavity (12) which are isolated from each other; A hydraulic pump (2), wherein the first chamber (11) is connected to the hydraulic pump (2) via a first branch (3), and the second chamber (12) is connected to the hydraulic pump (2) via a second branch (4), and at least one of the first branch (3) and the second branch (4) can be controlled to be on or off; The hydraulic pump (2) comprises a motor (21) and an impeller, the rotating shaft of the motor (21) is connected to the impeller, and the motor (21) is used to control the start or stop of the hydraulic pump (2); The motor (21) can maintain a zero speed state; The hydraulic pump (2) further comprises a detector and a controller; the detector is electrically connected to the impeller, and the controller is electrically connected to the detector and the motor (21) respectively; The detector is used to detect the data of the passive speed, the acceleration of the passive speed and the pressure of the oil generated by the impeller due to the fluctuation of the oil, and transmit the data to the controller; After receiving the data, the controller analyzes the data to obtain corresponding road surface excitation conditions, and transmits the road surface excitation conditions in the form of a control signal to the motor (21); after receiving the control signal, the motor (21) outputs a feedforward torque opposite to the passive torque through a rotating shaft, and the magnitude and direction of the feedforward torque can be adjusted in real time according to the passive rotation speed and the acceleration of the passive rotation speed so that the motor (21) maintains a zero rotation speed state.

2. The hydraulic system (100) according to claim 1, characterized in that: The first branch (3) and the second branch (4) are both provided with an on-off control element (5); the on-off control element (5) on the first branch (3) is used to control the on-off of the first branch (3), and the on-off control element (5) on the second branch (4) is used to control the on-off of the second branch (4).

3. The hydraulic system (100) according to claim 2, characterized in that: The on-off control element (5) is a switch valve.

4. The hydraulic system (100) according to claim 3, characterized in that: The switch valve is a two-way valve.

5. The hydraulic system (100) according to claim 1, characterized in that: The first branch (3) and / or the second branch (4) is provided with an energy storage device (6), and the energy storage device (6) is used to absorb pressure pulsations caused by fluctuations in the oil.

6. The hydraulic system (100) according to claim 5, characterized in that: The energy storage device (6) comprises a cylinder (61) and an elastic buffer (62), wherein the elastic buffer (62) is accommodated in the cylinder (61); when fluctuating oil flows into the cylinder (61), the elastic buffer (62) can expand and contract along the axial direction of the cylinder (61).

7. The hydraulic system (100) according to claim 6, characterized in that: The elastic buffer (62) comprises a bellows (621), a sealing cover (622) and a guide ring (623); the bellows (621) is coaxially arranged with the cylinder (61); the first end of the bellows (621) abuts against the inner wall of the cylinder (61); the edge of the second end of the bellows (621) is sealingly connected to the sealing cover (622); and the guide ring (623) is sleeved on the edge of the second end of the bellows (621) and is slidably connected to the inner wall of the cylinder (61).

8. The hydraulic system (100) according to claim 7, characterized in that: The elastic buffer component (62) further comprises a buffer block (624), wherein the buffer block (624) is fixedly connected to the outer surface of the sealing cover (622).

9. The hydraulic system (100) according to claim 1, characterized in that: A main circuit (7) is also connected between the first cavity (11) and the second cavity (12); when oil flows in the main circuit (7), the first branch (3) and / or the second branch (4) can be disconnected.

10. The hydraulic system (100) according to claim 9, characterized in that: The hydraulic system (100) is switchable between a first working mode and a second working mode; When the hydraulic system (100) is in a first working mode, at least one of the first branch circuit (3) and the second branch circuit (4) is disconnected, and oil flows between the first cavity (11) and the second cavity (12) through the main circuit (7); When the hydraulic system (100) is in a second working mode, the first branch (3) and the second branch (4) are both connected, and oil flows between the first cavity (11) and the second cavity (12) through the main circuit (7).

11. The hydraulic system (100) according to claim 9, characterized in that: The main circuit (7) comprises a first circuit (71) and a second circuit (72) which are arranged in parallel.

12. The hydraulic system (100) according to claim 11, characterized in that The first circuit (71) controls the oil to flow from the first cavity (11) to the second cavity (12), and the second circuit (72) controls the oil to flow from the second cavity (12) to the first cavity (11).

13. The hydraulic system (100) according to claim 12, characterized in that: The first circuit (71) is provided with a first flow guide (711), and the second circuit (72) is provided with a second flow guide (721); the first flow guide (711) and the second flow guide (721) are used to control the directional flow of oil.

14. The hydraulic system (100) according to claim 13, characterized in that The first flow guide member (711) and the second flow guide member (721) are both one-way valves.

15. The hydraulic system (100) according to claim 12, characterized in that: The first circuit (71) is provided with a first damping member (712), and the second circuit (72) is provided with a second damping member (722); when oil flows through the first damping member (712) and the second damping member (722), the oil is hindered.

16. The hydraulic system (100) according to claim 15, characterized in that The first damping member (712) and the second damping member (722) are both damping valves.

17. The hydraulic system (100) according to claim 16, characterized in that The opening degree of the damping valve is adjustable.

18. The hydraulic system (100) according to claim 9, characterized in that The main circuit (7) is provided with an energy absorbing device (8), and the energy absorbing device (8) is used to absorb pressure pulsations caused by fluctuations of the oil.

19. The hydraulic system (100) according to claim 18, characterized in that The energy absorbing device (8) comprises a shell (81) and a partition (82), wherein the partition (82) is located inside the shell (81) and is used to separate the inner cavity of the shell (81) into a gas cavity (83) and a liquid cavity (84) which are isolated from each other, wherein the gas cavity (83) stores gas, and the liquid cavity (84) is saturated with oil. The partition (82) is movable relative to the shell (81), and the liquid cavity (84) is connected to the main circuit (7).

20. The hydraulic system (100) according to claim 19, characterized in that The partition plate (82) is slidably connected to the inner wall of the outer shell (81).

21. A suspension assembly, characterized in that: A hydraulic system (100) comprising any one of claims 1 to 20.

22. A vehicle, characterized in that: Includes the suspension assembly as claimed in claim 21.

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