Hydraulic suspension system and vehicle having the same

Abstract

The hydraulic suspension system (1000) includes a plurality of height adjustment devices provided in one-to-one correspondence with a plurality of wheels, and a central control device (24). The central control device (24) includes a housing (240) and a moving member (241). The moving member (241) is provided movably within the housing (240) and divides the housing (240) into a first region and a second region in a moving direction. The first region includes a first chamber (243) and a second chamber (244) that are isolated from each other and communicate with the height adjustment devices, respectively. The second region includes a third chamber (245) and a fourth chamber (246) that are isolated from each other and communicate with the height adjustment devices, respectively. The wheels corresponding to the first chamber 243 and the second chamber 244 are located diagonally, and the wheels corresponding to the third chamber 245 and the fourth chamber 246 are also located diagonally. This system is more useful for improving the handling stability of the vehicle.

Description

[Technical Field]

[0001] (CROSS-REFERENCE TO RELATED APPLICATIONS) This application is based on and claims priority to a Chinese patent application filed on December 30, 2021, bearing application number 202111652021.8, the entire contents of which are incorporated herein by reference.

[0002] The present application relates to the field of vehicles, and more particularly to hydraulic suspension systems and vehicles having the same. [Background technology]

[0003] The suspension system plays a very important role in the safety and stability of a vehicle, but there is a contradictory relationship between the comfort and handling stability of the vehicle and the requirements for the suspension characteristics of the vehicle. Current suspension system designs often provide high comfort at the expense of a certain level of handling stability. Summary of the Invention [Problem to be solved by the invention]

[0004] The present application aims to solve at least to some extent one of the technical problems in the related art.

[0005] Therefore, one object of the present application is to provide a hydraulic suspension system that helps improve the handling stability of a vehicle.

[0006] The present application further provides a vehicle having the above hydraulic suspension system. [Means for solving the problem]

[0007] A hydraulic suspension system according to an embodiment of the present application includes a plurality of height adjustment devices and a central control device, the plurality of height adjustment devices being arranged in one-to-one correspondence with a plurality of wheels of a vehicle, the central control device including a housing and a movable member, the movable member being movably arranged within the housing and dividing the housing into a first region and a second region in the direction of movement of the movable member, the first region including a first chamber and a second chamber isolated from each other, the second region including a third chamber and a fourth chamber isolated from each other, the first chamber, the second chamber, the third chamber and the fourth chamber being in one-to-one correspondence with the plurality of height adjustment devices, the wheels corresponding to the height adjustment devices in communication with the first chamber and the second chamber being located diagonally, and the wheels corresponding to the height adjustment devices in communication with the third chamber and the fourth chamber being also located diagonally.

[0008] In the hydraulic suspension system according to the embodiment of the present application, when a single wheel of a vehicle encounters an obstacle, the height of the single wheel rises, and the medium in the height adjustment device corresponding to the single wheel flows into the central control device to move the moving member, so that the medium flows into the height adjustment device corresponding to the other diagonal wheels, thereby lowering the height of the other diagonal wheels, lengthening the time and difficulty of the other diagonal wheels to leave the ground, and improving the handling stability of the vehicle.

[0009] In some embodiments of the present application, the volume changes of the first chamber and the second chamber in the first region are opposite to the volume changes of the third chamber and the fourth chamber in the second region.

[0010] In some embodiments of the present application, the first chamber, the second chamber, the third chamber, and the fourth chamber are provided in order along the movement direction of the moving member.

[0011] In some embodiments of the present application, initially, the first chamber and the fourth chamber have the same volume, and the second chamber and the third chamber have the same volume.

[0012] In some embodiments of the present application, one of the front axle height adjustment device and the rear axle height adjustment device is in communication with the first chamber and the third chamber, and the other of the front axle height adjustment device and the rear axle height adjustment device is in communication with the second chamber and the fourth chamber.

[0013] In some embodiments of the present application, one of the front axle height adjustment device and the rear axle height adjustment device is in communication with the first chamber and the fourth chamber, and the other of the front axle height adjustment device and the rear axle height adjustment device is in communication with the second chamber and the third chamber.

[0014] In some embodiments of the present application, the central control device is provided with a first connection port, the height adjustment device includes a reservoir and a damper, the damper is provided corresponding to a wheel, the reservoir supplies oil to the damper, the first connection port is in communication with the damper, a plurality of first connection ports are provided and include a first port, a second port, a third port and a fourth port, the first port, the second port, the third port and the fourth port are in communication with the first chamber, the second chamber, the third chamber and the fourth chamber, respectively.

[0015] In some embodiments of the present application, the central control device further includes a second connection port configured to communicate with the reservoir, and the second connection port is provided in plurality, including a fifth port, a sixth port, a seventh port, and an eighth port, and the fifth port, the sixth port, the seventh port, and the eighth port communicate with the first chamber, the second chamber, the third chamber, and the fourth chamber, respectively.

[0016] In some embodiments of the present application, the axis of the first connection port is arranged perpendicular to the axis of the second connection port.

[0017] In some embodiments of the present application, the hydraulic suspension system further includes a first control valve, a second control valve, a third control valve, and a fourth control valve, wherein the first control valve is provided between the fifth port and the reservoir, the second control valve is provided between a sixth port and the reservoir, the third control valve is provided between the seventh port and the reservoir, and the fourth control valve is provided between the eighth port and the reservoir.

[0018] In some embodiments of the present application, a first connecting passage is provided between the first control valve and the fourth control valve, and a fifth control valve is provided in the first connecting passage, and a second connecting passage is provided between the second control valve and the third control valve, and a sixth control valve is provided in the second connecting passage.

[0019] In some embodiments of the present application, the movable member includes a first part, a second part, and a third part, wherein the first part moves axially along a side wall of the housing to divide the housing into the first region and the second region, the second part is connected to one side of the first part and moves along the side wall of the housing to divide the first region into the first chamber and the second chamber, and the third part is connected to the other side of the first part and moves along the side wall of the housing to divide the second region into the third chamber and the fourth chamber.

[0020] In some embodiments of the present application, the housing has a first cylinder, a second cylinder, and a third cylinder arranged in order along the movement direction of the movable member, the inner diameter of the second cylinder is larger than the inner diameter of the first cylinder and is larger than the inner diameter of the third cylinder, the first chamber is formed between the second portion and the inner wall of the first cylinder, the first portion contacts the inner wall of the second cylinder to divide the second cylinder into the second chamber and the third chamber, and the fourth chamber is formed between the third portion and the inner wall of the third cylinder.

[0021] In some embodiments of the present application, the extension direction of the first portion is perpendicular to the extension direction of the second portion, and the extension direction of the second portion and the third portion are arranged symmetrically with respect to the first portion.

[0022] In some embodiments of the present application, a return spring is provided between the moving member and the end wall of the housing.

[0023] In some embodiments of the present application, the damper includes a damper housing, a piston, and a piston rod, the damper housing configured to be connected to a wheel, the piston is located within the damper housing and cooperates with the damper housing to define an upper chamber and a lower chamber, one end of the piston rod is connected to the piston, the piston rod is configured to be connected to a vehicle body, an oil passage is provided within the piston rod, the oil passage is in communication with the lower chamber, and the reservoir supplies oil to the damper via the oil passage.

[0024] In some embodiments of the present application, the height adjustment device further includes a connecting passage and an accumulator module, the connecting passage communicating between the central control device and the corresponding damper;

[0025] The accumulator module includes a damping adjustment accumulator and an opening adjustment valve, the damping adjustment accumulator is connected between the damper and the central control device, and the opening adjustment valve is provided between the damping adjustment accumulator and the damper.

[0026] In some embodiments of the present application, the accumulator module further includes a stiffness adjustment accumulator and a stiffness adjustment valve, the connecting passage is provided with a stiffness adjustment connection point, the stiffness adjustment accumulator is in communication with the stiffness adjustment connection point, and the stiffness adjustment valve is provided between the stiffness adjustment accumulator and the stiffness adjustment connection point.

[0027] In some embodiments of the present application, the height adjustment device further includes a seventh control valve, and the seventh control valve is provided between the stiffness adjustment connection point and the damping adjustment accumulator.

[0028] In some embodiments of the present application, the central control unit is a cylinder structure.

[0029] A vehicle according to an embodiment of the present application includes the hydraulic suspension system described in the above embodiment of the present application.

[0030] In the vehicle according to the embodiment of the present application, if the vehicle has a tendency to roll, the roll can be suppressed. If the heights of the four wheels of the vehicle are not the same, the height of the vehicle body can be adjusted to reduce the tilt width of the vehicle, thereby preventing the vehicle from rolling.

[0031] Additional aspects and advantages of the present application will be set forth in part in the description that follows, and in part will be obvious from the description, or may be learned by practice of the present application. [Brief explanation of the drawings]

[0032] [Figure 1] 1 is a schematic diagram of a hydraulic suspension system according to another embodiment of the present application; [Figure 2]1 is a schematic diagram of a hydraulic suspension system according to another embodiment of the present application; [Figure 3] 2 is a schematic diagram of a left front damper assembly and a right front damper assembly according to an embodiment of the present application. FIG. [Figure 4] FIG. 4 is a cross-sectional view of the damper assembly shown in FIG. 3. [Figure 5] FIG. 2 is a cross-sectional view of a central control device according to an embodiment of the present application. [Figure 6] FIG. 2 is a perspective view of a central control device according to an embodiment of the present application. [Figure 7] 1 is a schematic diagram of a metal bellows accumulator according to an embodiment of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0033] Hereinafter, the embodiments of the present application will be described in detail, and examples of the embodiments are shown in the drawings, and the same or similar reference numerals throughout indicate the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are merely illustrative and are intended to interpret the present application, but should not be understood to limit the present application.

[0034] A hydraulic suspension system 1000 according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 7. The hydraulic suspension system 1000 is used in a vehicle and connects an axle and a body of the vehicle.

[0035] As shown in FIGS. 1-2 and 5 , a hydraulic suspension system 1000 according to an embodiment of the present invention includes a plurality of height adjustment devices and a central control device 24. The height adjustment devices are provided in one-to-one correspondence with the vehicle's wheels, and each height adjustment device is connected to the vehicle body. Specifically, the height adjustment devices include a front axle height adjustment device and a rear axle height adjustment device. The front axle height adjustment devices are provided corresponding to the left front wheel and the right front wheel, respectively, and the rear axle height adjustment devices are provided corresponding to the left rear wheel and the right rear wheel, respectively. For convenience of explanation, the height adjustment device corresponding to the left front wheel will be referred to as the left front height adjustment device, the height adjustment device corresponding to the right front wheel will be referred to as the right front height adjustment device, the height adjustment device corresponding to the left rear wheel will be referred to as the left rear height adjustment device, and the height adjustment device corresponding to the right rear wheel will be referred to as the right rear height adjustment device. The height adjustment devices according to the present invention adjust the vehicle height, i.e., the relative distance between the wheels and the vehicle body.

[0036] The central control device 24 includes a housing 240 and a movable member 241. The movable member 241 is movably disposed within the housing 240 and divides the housing 240 into a first region and a second region in the direction of movement of the movable member 241. The first region includes a first chamber 243 and a second chamber 244 that are isolated from each other, and the second region includes a third chamber 245 and a fourth chamber 246 that are isolated from each other. The first chamber 243, the second chamber 244, the third chamber 245, and the fourth chamber 246 are configured to be filled with a medium. In this application, the medium is oil. In other embodiments, other media may be used, consistent with the medium in the height adjustment device.

[0037] Specifically, the first chamber 243, the second chamber 244, the third chamber 245, and the fourth chamber 246 are all filled with oil, and when the amount of oil in the first region increases, a force is applied to the moving member 241 to move it toward the second region, and when the amount of oil in the second region increases, a force is applied to the moving member 241 to move it toward the first region. In some specific examples of the present application, the first chamber 243, the second chamber 244, the third chamber 245, and the fourth chamber 246 are arranged in order along the moving direction of the moving member 241. Of course, as can be understood, the arrangement order of the first chamber 243, the second chamber 244, the third chamber 245, and the fourth chamber 246 is not limited thereto, as long as it ensures that the first chamber 243 and the second chamber 244 are distributed in the first region, and the third chamber 245 and the fourth chamber 246 are distributed in the second region.

[0038] The first chamber 243, the second chamber 244, the third chamber 245 and the fourth chamber 246 are connected to a plurality of height adjustment devices in one-to-one correspondence, and the wheels corresponding to the height adjustment devices connected to the first chamber 243 and the second chamber 244 are located diagonally, and the wheels corresponding to the height adjustment devices connected to the third chamber 245 and the fourth chamber 246 are also located diagonally.

[0039] Specifically, if the wheels corresponding to the height adjustment devices communicated with the first chamber 243 and the second chamber 244 are the left front wheel and the right rear wheel, the wheels corresponding to the height adjustment devices communicated with the third chamber 245 and the fourth chamber 246 may be the right front wheel and the left rear wheel. In this case, the first chamber 243 communicates with one of the left front height adjustment device and the right rear height adjustment device, and the second chamber 244 communicates with the other of the left front height adjustment device and the right rear height adjustment device. The third chamber 245 communicates with one of the right front height adjustment device and the left rear height adjustment device, and the fourth chamber 246 communicates with the other of the right front height adjustment device and the left rear height adjustment device.

[0040] If the wheels corresponding to the height adjustment devices communicated with the first chamber 243 and the second chamber 244 are the right front wheel and the left rear wheel, the wheels corresponding to the height adjustment devices communicated with the third chamber 245 and the fourth chamber 246 are the left front wheel and the right rear wheel. In this case, the first chamber 243 communicates with one of the right front height adjustment device and the left rear height adjustment device, and the second chamber 244 communicates with the other of the right front height adjustment device and the left rear height adjustment device. The third chamber 245 communicates with one of the left front height adjustment device and the right rear height adjustment device, and the fourth chamber 246 communicates with the other of the left front height adjustment device and the right rear height adjustment device.

[0041] In addition, if one chamber of the central control unit 24 is connected to a corresponding height adjustment device, oil may flow between the chamber and the height adjustment device. When the distance between the wheel and the corresponding vehicle body changes, oil can flow into or out of the height adjustment device. In this embodiment, the central control unit 24 has a cylinder structure.

[0042] When a single wheel of a vehicle encounters an obstacle, the height of the single wheel rises, so that the oil in the height adjustment device corresponding to the single wheel flows into the central control device, causing the moving member to move, and therefore the medium flows into the height adjustment device corresponding to the other diagonal wheels, thereby lowering the height of the other diagonal wheels, lengthening the time and difficulty of the other diagonal wheels to leave the ground, and improving the handling stability of the vehicle.

[0043] For example, if the left front wheel encounters an obstacle, the left front wheel is lifted, and as the vehicle continues to travel, the center of gravity of the vehicle is raised, which may cause the right front wheel and left rear wheel to leave the ground, resulting in the vehicle running out of control. In the present application, by providing a central control device, when the left front wheel encounters an obstacle, oil in the left front height adjustment device flows into the first region, and the oil that has flowed into the first region acts on the moving member 241, moving the moving member 241 into the second region. In this way, the oil in the second region is pushed out and flows into the right front height adjustment device and the left rear height adjustment device, increasing the distance between the right front wheel and the left rear wheel and the vehicle body and lowering the height of the right front wheel and the left rear wheel, thereby reducing the risk of the right front wheel and the left rear wheel leaving the ground and improving the handling stability of the vehicle.

[0044] On the other hand, when the vehicle tends to roll, for example, when the left front wheel and the left rear wheel are lifted, the left front height adjustment device and the left rear height adjustment device flow into the first area and the second area, respectively, and the force acting on the movable member 241 in the first area is opposite to the force acting on the movable member 241 in the second area, and the two opposite acting forces cancel each other out, so the movable member 241 does not move, that is, the oil passage between the central control device 24 and the right front height adjustment device and the right rear height adjustment device does not flow, so that the right front height adjustment device and the right rear height adjustment device maintain their current height state, suppress changes in the distance between the right front wheel and the vehicle body, and suppress changes in the distance between the right rear wheel and the vehicle body, thereby suppressing roll.

[0045] When the left front wheel of the vehicle encounters an obstacle such as a stone, the left front wheel is lifted, and oil in the left front height adjustment device flows into one of the first area and the second area, allowing the moving member 241 to move, and further oil in the other of the first area and the second area flows into the right front height adjustment device and the left rear height adjustment device, increasing the distance between the right front wheel and the left rear wheel and the vehicle body, thereby adjusting the height of the vehicle body to reduce the vehicle's tilt width and avoid vehicle roll.

[0046] Of course, it can be understood that the above several situations are merely illustrative, and when the vehicle encounters other situations such as right front wheel lift, left rear wheel lift, etc., the oil will flow in accordance with the above interlocking principle to prevent the vehicle from rolling, and each situation will not be described in detail here.

[0047] In the hydraulic suspension system 1000 according to the embodiment of the present application, the central control unit 24 and the plurality of height adjustment units can suppress the roll when the vehicle has a tendency to roll. When the heights of the four wheels of the vehicle are not the same, the height of the vehicle body can be adjusted to reduce the vehicle tilt width and prevent the vehicle from rolling.

[0048] In some embodiments of the present application, the volume changes of the first chamber 243 and the second chamber 244 in the first region are opposite to the volume changes of the third chamber 245 and the fourth chamber 246 in the second region. That is, when the volumes of the first chamber 243 and the second chamber 244 increase, the volumes of the third chamber 245 and the fourth chamber 246 decrease. Alternatively, when the volumes of the first chamber 243 and the second chamber 244 decrease, the volumes of the third chamber 245 and the fourth chamber 246 increase. This ensures reliable movement of the moving member 241 and ensures the roll suppression action by the central control device 24.

[0049] In some embodiments of the present application, in an initial state, the volumes of the first chamber 243 and the fourth chamber 246 are the same, and the volumes of the second chamber 244 and the third chamber 245 are the same, so that in an initial state, the moving member 241 is in a neutral position, ensuring that the response state to each height adjustment device is the same.

[0050] In some embodiments of the present application, one of the front axle height adjustment device and the rear axle height adjustment device communicates with the first chamber 243 and the third chamber 245, and the other of the front axle height adjustment device and the rear axle height adjustment device communicates with the second chamber 244 and the fourth chamber 246. Specifically, an example will be described in which the left front height adjustment device communicates with the first chamber 243, the right front height adjustment device communicates with the third chamber 245, the left rear height adjustment device communicates with the fourth chamber 246, and the right rear height adjustment device communicates with the second chamber 244.

[0051] When the vehicle tends to pitch, for example, when emergency braking causes the vehicle to nose-dive, i.e., when the distance between the front body of the vehicle and the wheel corresponding to the front axle height adjuster becomes small, the oil in the left front height adjuster and the right front height adjuster flows into the first chamber 243 and the third chamber 245, respectively. The force acting on the moving member 241 in the first region is opposite to the force acting on the moving member 241 in the second region, and the two opposing forces cancel each other out, so the moving member 241 does not move. This means that the oil passage between the central control device 24 and the right rear height adjuster and the left rear height adjuster does not flow. This allows the left rear height adjuster and the right rear height adjuster to maintain their current height, inhibiting changes in the distance between the left rear wheel and the body, and inhibiting changes in the distance between the right rear wheel and the body, thereby inhibiting nose-dive, i.e., providing the vehicle with an anti-pitching function.

[0052] Of course, it will be understood that the above oil flow description is merely an example to introduce the anti-pitching principle, and that the hydraulic suspension system 1000 can provide anti-pitching force by utilizing the above anti-pitching principle when the vehicle squats due to sudden acceleration of the vehicle or when there is a tendency for the vehicle to pitch in other situations.

[0053] In some embodiments of the present application, one of the front axle height adjustment device and the rear axle height adjustment device communicates with the first chamber 243 and the fourth chamber 246, and the other of the front axle height adjustment device and the rear axle height adjustment device communicates with the second chamber 244 and the third chamber 245. Specifically, an example will be described in which the left front height adjustment device communicates with the first chamber 243, the right front height adjustment device communicates with the fourth chamber 246, the left rear height adjustment device communicates with the third chamber 245, and the right rear height adjustment device communicates with the second chamber 244.

[0054] When the vehicle tends to roll, for example, when the distance between the left front wheel and the vehicle body becomes smaller and the distance between the left rear wheel and the vehicle body becomes smaller, the oil flowing out from the left front height adjustment device flows into the first chamber 243, and the oil flowing out from the left rear height adjustment device flows into the third chamber 245. That is, the force acting on the moving member 241 in the first region and the force acting on the moving member 241 in the second region are opposite, and the two opposite forces cancel each other out, so the moving member 241 does not move. That is, the oil passages between the central control device 24 and the right front height adjustment device and the right rear height adjustment device do not flow. As a result, the right front height adjustment device and the right rear height adjustment device maintain their current height state, suppressing changes in the distance between the right front wheel and the vehicle body and suppressing changes in the distance between the right rear wheel and the vehicle body, thereby suppressing roll.

[0055] Of course, it will be appreciated that the above oil flow description is merely exemplary to introduce the anti-roll principle, and that the above anti-roll principle can be utilized by the hydraulic suspension system 1000 to provide anti-roll forces when the vehicle encounters other roll situations.

[0056] 1 to 2, 5, and 6, in some embodiments of the present application, the central control device 24 is provided with a first connection port 2401, the height adjustment device includes a reservoir and a damper 200, the damper 200 is provided corresponding to the wheel, the reservoir supplies oil to the damper 200, and the first connection port 2401 is in communication with the damper 200. A plurality of first connection ports 2401 are provided, and include a first port 24011, a second port 24012, a third port 24013, and a fourth port 24014, and the first port 24011, the second port 24012, the third port 24013, and the fourth port 24014 are in communication with a first chamber 243, a second chamber 244, a third chamber 245, and a fourth chamber 246, respectively. By providing the first connection port 2401, communication between the multiple dampers 200 and the central control device 24 is realized, and communication between the different height adjustment devices and the central control device 24 is also realized.

[0057] 1 to 2, 5, and 6, the central control device 24 preferably further includes a second connection port 2402, which is configured to communicate with the reservoir. A plurality of second connection ports 2402 are provided, including a fifth port 24021, a sixth port 24022, a seventh port 24023, and an eighth port 24024, which communicate with the first chamber 243, the second chamber 244, the third chamber 245, and the fourth chamber 246, respectively. As a result, the oil in the reservoir passes through the central control device 24 and then flows into the height adjustment devices, allowing height adjustment when the vehicle is not in a horizontal state. When the vehicle is not in a horizontal state, the state of each height adjustment device is different. At this time, the reservoir passes oil to each height adjustment device via the central control device, and the moving member 241 automatically distributes the oil that has flowed into each height adjustment device. This eliminates the need to extra-calculate the amount of oil that needs to be passed through each height adjustment device depending on the state of the vehicle, making it simple and convenient.

[0058] 6, in some examples of the present application, the axis of the first connection port 2401 is arranged perpendicular to the axis of the second connection port 2402. This allows for efficient use of the peripheral space of the central control device 24, making the hydraulic suspension system 1000 more compact.

[0059] 1 and 2 , in some embodiments of the present application, the hydraulic suspension system 1000 further includes a first control valve 3, a second control valve 4, a third control valve 5, and a fourth control valve 6, where the first control valve 3 is provided between the fifth port 24021 and the reservoir, the second control valve 4 is provided between the sixth port 24022 and the reservoir, the third control valve 5 is provided between the seventh port 24023 and the reservoir, and the fourth control valve 6 is provided between the eighth port 24024 and the reservoir. Thus, by controlling the operating states of the first control valve 3 to the fourth control valve 6, it is possible to control whether or not oil in the reservoir flows into the height adjustment device through the central control device.

[0060] Preferably, the control valves include a first control valve 3, a second control valve 4, a third control valve 5, and a fourth control valve 6, which selectively connect one of the second connection port 2402 and the damper to the reservoir. The passage switching in the control valves here can realize not only a direct flow from the reservoir to the height adjustment device, but also a flow from the reservoir to the height adjustment device via the central control device. This eliminates the need to provide two branch paths and two valves to respectively realize a direct flow from the reservoir to the height adjustment device and a flow from the reservoir to the height adjustment device via the central control device.

[0061] Of course, in other embodiments, this may be achieved by providing two branches and two valves.

[0062] In some embodiments of the present application, a first connecting passage is provided between the first control valve 3 and the fourth control valve 6, and a fifth control valve 7 is provided in the first connecting passage, and a second connecting passage is provided between the second control valve 4 and the third control valve 5, and a sixth control valve 8 is provided in the second connecting passage.

[0063] Specifically, when the fifth control valve 7 is opened, the fifth port 24021 and the eighth port 24024 communicate with each other, thereby communicating the first chamber 243 and the fourth chamber 246. When the sixth control valve 8 is opened, the sixth port 24022 and the seventh port 24023 communicate with each other, thereby communicating the second chamber 244 and the third chamber 245. This allows the multiple height adjustment devices to communicate with each other, thereby achieving the purpose of maintaining the height of the vehicle body.

[0064] 5 and 6 , in some embodiments of the present application, the moving member 241 includes a first portion 2410, a second portion 2411, and a third portion 2412, wherein the first portion 2410 moves axially along the side wall of the housing 240 to divide the housing 240 into a first region and a second region, the second portion 2411 is connected to one side of the first portion 2410 and moves along the side wall of the housing 240 to divide the first region into a first chamber 243 and a second chamber 244, and the third portion 2412 is connected to the other side of the first portion 2410 and moves along the side wall of the housing 240 to divide the second region into a third chamber 245 and a fourth chamber 246. This simplifies the structure of the moving member 241.

[0065] Preferably, the housing 240 has a first cylindrical body 2403, a second cylindrical body 2404, and a third cylindrical body 2405 arranged in this order along the moving direction of the moving member 241, the inner diameter of the second cylindrical body 2404 being larger than the inner diameter of the first cylindrical body 2403 and larger than the inner diameter of the third cylindrical body 2405, a first chamber 243 being formed between the second portion 2411 and the inner wall of the first cylindrical body 2403, the first portion 2410 being in contact with the inner wall of the second cylindrical body 2404 to divide the second cylindrical body 2404 into a second chamber 244 and a third chamber 245, and a fourth chamber 246 being formed between the third portion 2412 and the inner wall of the third cylindrical body 2405. This simplifies the structure of the central control unit 24.

[0066] In some examples of the present application, the extension direction of the first portion 2410 is perpendicular to the extension direction of the second portion 2411, and the extension direction of the second portion 2411 and the third portion 2412 are provided symmetrically with respect to the first portion 2410. This ensures that the volumes of the first region and the second region are the same.

[0067] In some embodiments of the present application, a return spring is provided between the moving member 241 and the end wall of the housing 240, which can push the moving member 241 to return to the intermediate position.

[0068] 5 , the central control unit 24 preferably further includes a first return spring 247 and a second return spring 248, where both ends of the first return spring 247 abut against the left ends of the housing 240 and the moving member 241, respectively, and both ends of the second return spring 248 abut against the right ends of the housing 240 and the moving member 241, respectively, and the first return spring 247 and the second return spring 248 push the moving member 241 to return toward the center. Specifically, when the moving member 241 moves to the left due to vehicle roll, the first return spring 247 can push the moving member 241 to the right to return it. When the moving member 241 moves to the right due to vehicle roll, the second return spring 248 can push the moving member 241 to the left to return it, thereby ensuring the reliability of the central control unit 24.

[0069] In some examples of the present application, as shown in FIG. 5 , the central control device 24 includes a guide unit 249, the guide unit 249 includes a first guide member 2490 and a second guide member 2491, the first guide member 2490 and the second guide member 2491 are slidably engaged with each other, the first guide member 2490 is fixed to the housing 240, the second guide member 2491 is fixed to the moving member 241, the first return spring 247 is fitted on the left guide unit 249, and the first guide member The second return spring 248 is fitted onto the right guide unit 249 and abuts against the first guide member 2490, and the provision of the guide unit 249 not only facilitates the assembly of the first return spring 247 and the second return spring 248, but also easily limits the deformation range of the first return spring 247 and the second return spring 248, and prevents the first return spring 247 and the second return spring 248 from failing due to excessive deformation.

[0070] Preferably, the second guide member 2491 is a screw, and one end of the second guide member 2491 enters the first guide member 2490 and is movably engaged with the first guide member 2490, thereby simplifying the structure of the guide unit 249.

[0071] As shown in Figures 1 to 7, the hydraulic suspension system 1000 according to the embodiment of the present application includes a central control unit 24, four sets of damper assemblies 2, and a reservoir, the reservoir including an oil storage pot 1, the height adjustment device including a damper assembly, and the reservoirs of the multiple sets of height adjustment devices are identical, which can save costs and make the hydraulic suspension system 1000 more compact.

[0072] The central control unit 24 includes a housing 240 and a movable member 241, which is movably disposed within the housing 240 and cooperates with the housing 240 to define a first chamber 243, a second chamber 244, a third chamber 245 and a fourth chamber 246, which are arranged in order in the direction of movement of the movable member 241, with the first chamber 243 and the second chamber 244 being distributed on one side of a first portion 2411 of the movable member 241, and the third chamber 245 and the fourth chamber 246 being distributed on the other side of the first portion 2411, and the first portion 2411 being movably engaged with the inner wall of the housing 240.

[0073] The four sets of damper assemblies 2 are divided into a left front damper assembly 2, a left rear damper assembly 2, a right front damper assembly 2, and a right rear damper assembly 2, and each set of damper assemblies 2 includes a damper 200, which includes a damper housing 201, a piston 202, and a piston rod 203, the piston 202 is located within the damper housing 201 and cooperates with the damper housing 201 to define an upper chamber 2011 and a lower chamber 2012, the piston rod 203 is provided on the piston 202, the upper end of the piston rod 203 is configured to be connected to the vehicle body, and an oil passage 204 is provided within the piston rod 203, and the oil passage 204 communicates with the lower chamber 2012. In the description of this application, "front" refers to the direction toward the head of the vehicle, and "rear" refers to the direction toward the tail of the vehicle, and in the forward direction, the direction to the right of the primary driver is referred to as the right side, and the direction to the left of the primary driver is referred to as the left side.

[0074] The oil passage 204 of the left front damper assembly 2 is connected to one of the first chamber 243 and the second chamber 244, and the oil passage 204 of the right rear damper assembly 2 is connected to the other of the first chamber 243 and the second chamber 244. The oil passage 204 of the left rear damper assembly 2 is connected to one of the third chamber 245 and the fourth chamber 246, and the oil passage 204 of the right front damper assembly 2 is connected to the other of the third chamber 245 and the fourth chamber 246. For convenience of explanation, the following description will be given using an example in which the oil passage 204 of the left front damper assembly 2 is connected to the first chamber 243, the oil passage 204 of the right rear damper assembly 2 is connected to the second chamber 244, the oil passage 204 of the left rear damper assembly 2 is connected to the third chamber 245, and the oil passage 204 of the right front damper assembly 2 is connected to the fourth chamber 246.

[0075] Specifically, when the vehicle tends to roll, for example, when the piston rods 203 of the left front damper assembly 2 and the left rear damper assembly 2 are compressed and the piston rods 203 of the right front damper assembly 2 and the right rear damper assembly 2 are pulled, the oil in the lower chamber 2012 of the left front damper assembly 2 flows into the first chamber 243 through the oil passage 204, and the oil in the lower chamber 2012 of the left rear damper assembly 2 flows into the third chamber 245 through the oil passage 204, and the oil in the first chamber 243 flows into the third chamber 245 through the oil passage 204. Since the spring 243 and the third chamber 245 are located on both sides of the first part 2411, the direction of the force of the oil in the first chamber 243 acting on the first part 2411 is opposite to the direction of the force of the third chamber 245 acting on the first part 2411, and the two opposite acting forces cancel each other out, so the moving member 241 does not move, which suppresses the movement of the piston rod 203 of the left front damper assembly 2 and the piston rod 203 of the left rear damper assembly 2, thereby suppressing roll.

[0076] When the left front wheel of the vehicle encounters an obstacle such as a stone, the left front wheel is lifted and the compression width of the left front damper assembly 2 becomes greater than the compression width of the left rear damper assembly 2. In this case, the amount of oil flowing from the left front damper assembly 2 into the first chamber 243 becomes greater than the amount of oil flowing from the left rear damper assembly 2 into the third chamber 245. As a result, the moving member 241 moves to the right and presses the third chamber 245 and the fourth chamber 246. The oil in the third chamber 245 flows into the lower chamber 2012 of the left rear damper assembly 2 and moves the piston rod 203 upward. The oil in the fourth chamber 246 flows into the lower chamber 2012 of the right front damper assembly 2 and moves the piston rod 203 upward. This reduces the possibility of the left rear wheel and right front wheel coming off the ground and improves the stability of the vehicle.

[0077] Of course, it can be understood that the above several situations are merely illustrative, and when the vehicle encounters other situations such as right front wheel lift, left rear wheel lift, etc., the oil will flow in accordance with the above interlocking principle to improve the stability of the vehicle, and each situation will not be described in detail here.

[0078] The hydraulic suspension system 1000 according to the embodiment of the present application is provided with a central control unit 24 and four damper assemblies, each of which is provided with an oil passage 204, so that if the vehicle has a tendency to roll, it can suppress the roll. If the heights of the four wheels of the vehicle are not the same, the height of the vehicle body can be adjusted to reduce the amount of tilt of the vehicle, thereby preventing the vehicle from tilting.

[0079] As shown in Figures 1 and 2, the oil storage pot 1 and the central control device are connected by a third connecting passage, and the first control valve 3 to the fourth control valve 6 are respectively provided in the corresponding third connecting passages to open or close the corresponding third connecting passages. In other words, when the control valve corresponding to each set of damper assemblies 2 closes the corresponding third connecting passage, the flow path between the oil storage pot 1 and the first chamber, second chamber, third chamber and fourth chamber corresponding to the central control device is blocked, and the oil in the oil storage pot 1 does not flow into the corresponding central control device.

[0080] Specifically, hydraulic suspension system 1000 has a lift mode and a height reduction mode. In the lift mode, oil can flow into oil passage 204 of left front damper assembly 2, oil passage 204 of right front damper assembly 2, oil passage 204 of left rear damper assembly 2, and oil passage 204 of right rear damper assembly 2. The oil that flows into each oil passage 204 flows into lower chamber 2012, which increases the hydraulic pressure in lower chamber 2012 and moves piston 202 upward, which in turn moves piston rod 203 upward. The piston rod 203 of left front damper assembly 2 moves upward, the piston rod 203 of right front damper assembly 2 moves upward, the piston rod 203 of left rear damper assembly 2 moves upward, and the piston rod 203 of right rear damper assembly 2 moves upward, moving the vehicle body upward and achieving the purpose of lifting the vehicle body.

[0081] In the height reduction mode, oil can flow into the oil storage pot 1 from the oil passage 204 of the left front damper assembly 2, the oil passage 204 of the right front damper assembly 2, the oil passage 204 of the left rear damper assembly 2, and the oil passage 204 of the right rear damper assembly 2, respectively, so that the oil pressure in the lower chamber 2012 of each damper 200 decreases, causing the piston 202 to move downward, which in turn moves the piston rod 203 downward. The piston rod 203 of the left front damper assembly 2 moves downward, the piston rod 203 of the right front damper assembly 2 moves downward, the piston rod 203 of the left rear damper assembly 2 moves downward, and the piston rod 203 of the right rear damper assembly 2 moves downward, moving the vehicle body downward and achieving the purpose of reducing the vehicle height.

[0082] When a vehicle is traveling, it will encounter various road conditions, and once the vehicle suspension system in the related art is selected, it cannot be adjusted while the vehicle is traveling. Therefore, the conventional suspension can only ensure that the vehicle achieves optimal matching of performance under specific road and speed conditions, and passively receives the ground force acting on the vehicle body, and cannot change suspension parameters according to the road and vehicle speed, and furthermore, cannot actively control the ground force acting on the vehicle body.

[0083] The hydraulic suspension system 1000 according to the embodiment of the present application can adjust the height of the vehicle body according to road conditions, etc. For example, when traveling on a relatively steep mountain road, the system can enter a lift mode to raise the center of gravity of the vehicle and improve the stability of the vehicle. When it is necessary to reduce the influence of the vehicle body on the traveling speed, the system can enter a height reduction mode to lower the center of gravity of the vehicle. Of course, it should be understood that the above is merely an exemplary description, and the height of the vehicle body may be adjusted according to actual needs during traveling.

[0084] The hydraulic suspension system 1000 according to the embodiment of the present application can adjust the height of the vehicle body, improve the vehicle handling stability without compromising the vehicle comfort, and effectively resolve the trade-off between the vehicle comfort and the handling stability. In addition, the use of a hollow piston rod 203 not only reduces weight, but also allows the position of the piston rod 203 to be adjusted by utilizing the oil passage 204 defined by the hollow piston rod 203 to allow oil to flow in or out, thereby achieving a simple adjustment method, high reliability, low cost, and fast response.

[0085] As shown in FIGS. 1 and 2 , in some embodiments of the present application, the oil storage pot 1 has an oil outlet and an oil inlet, and the reservoir further includes a control pump 26 and an oil return valve 27. The control pump 26 is connected to the oil outlet and the third connecting passage, respectively, to guide oil in the oil storage pot 1 to the third connecting passage. The oil return valve 27 is connected to the oil inlet and the third connecting passage, respectively. When the oil return valve 27 is opened, oil flows from the third connecting passage to the oil inlet. That is, the oil storage pot 1 has independent oil inlet and oil outlet passages. When oil needs to flow out, the control pump 26 is opened and the oil return valve 27 is closed, and the control pump 26 guides oil to each set of damper assemblies 2. When oil needs to flow in, the control pump 26 is closed and the oil return valve 27 is opened, allowing oil flowing out of each set of damper assemblies 2 to flow into the oil storage pot 1 through the oil return valve 27. This ensures a reliable flow of oil in and out by providing two independent passages.

[0086] 1 and 2, in some examples of the present application, the controlled pump 26 includes a control valve element 260 and a drive motor 261. The drive motor 261 is electrically connected to a valve in the control valve element 260, and the drive motor 261 rotates to control the rotation of the valve, thereby turning on or off the controlled pump 26. In this way, the control pump 26 is turned on or off by cooperation between the drive motor 261 and the valve, ensuring relatively reliable operation of the controlled pump 26 and reducing the influence of oil on the turning on or off of the controlled pump 26.

[0087] Preferably, as shown in Figures 1 and 2, the hydraulic suspension system 1000 further includes a check valve 28, which is provided at the outlet end of the control pump 26 and is unidirectional, so that in the event of oil inflow, the check valve 28 can effectively prevent oil from flowing into the control pump 26, and in the event of a failure of the control pump 26, can prevent oil from flowing through the control pump 26 into the oil outlet.

[0088] In some embodiments of the present application, as shown in FIGS. 1-2, the hydraulic suspension system 1000 further includes a pressure-retaining accumulator 29, which is provided at the outlet end of the control pump 26 to retain pressure and eliminate flow rate fluctuations at the outlet end of the control pump 26.

[0089] In some examples of the present application, the pressure-retaining accumulator 29 may be a metal bellows accumulator. As shown in FIG. 7, the metal bellows accumulator consists of a cylindrical body assembly and a bellows assembly. The cylindrical body assembly includes an upper cover, a packing, a cylinder tube, a snap ring, and a seal ring. The bellows assembly includes a seal cap, a guide ring, a bellows, and a lower cover. The metal bellows accumulator may use a metal bellows 101 as a flexible separation element between fluid and gas, instead of an air bag or diaphragm. The bellows can be used over a very wide temperature range. The metal bellows is completely airtight because it is welded to other components. It can move up and down inside the accumulator without friction or wear, allowing it to operate for a long time with just one adjustment.

[0090] 1-2, in some embodiments of the present application, the hydraulic suspension system 1000 further includes a relief valve 31, which is located at the outlet end of the control pump 26. When the pressure at the oil outlet of the control pump 26 reaches a certain threshold, the relief valve 31 is opened to relieve pressure, thereby ensuring that the hydraulic suspension system 1000 remains within a normal pressure range. Note that the operating principle of the relief valve 31 has already become a conventional technology and will not be described in detail here.

[0091] As shown in Figures 1 and 2, in some embodiments of the present application, the hydraulic suspension system 1000 further includes a first connecting passage and a second connecting passage, the first connecting passage being connected to the oil passage 204 of the left front damper assembly 2 and the oil passage 204 of the right front damper assembly 2, respectively, and the first connecting passage is provided with a fifth control valve 7 for connecting or disconnecting the first connecting passage.

[0092] The second connecting passages are connected to the oil passages 204 of the left rear damper assembly 2 and the right rear damper assembly 2, respectively, and the second connecting passages are provided with a sixth control valve 8 for connecting or disconnecting the second connecting passages.

[0093] Specifically, when the fifth control valve 7 is opened, the first connecting passage is opened, and when the fifth control valve 7 is closed, the first connecting passage is shut off. When the sixth control valve 8 is opened, the second connecting passage is opened, and when the sixth control valve 8 is closed, the second connecting passage is shut off.

[0094] When it is necessary to maintain the vehicle body height, hydraulic suspension system 1000 switches to height maintenance mode, fifth control valve 7 and sixth control valve 8 are both opened, the first connecting passage and the second connecting passage are connected, oil passage 204 of left front damper assembly 2 is connected to oil passage 204 of right front damper assembly 2, and oil passage 204 of left rear damper assembly 2 is connected to oil passage 204 of left rear damper assembly 2. In other words, piston rod 203 of left front damper assembly 2 is in an interlocking state with piston rod 203 of right front damper assembly 2, and piston rod 203 of left rear damper assembly 2 is in an interlocking state with piston rod 203 of left rear damper assembly 2, thereby enabling the current height of the vehicle body to be maintained as much as possible.

[0095] In some embodiments of the present application, as shown in FIGS. 1 and 2 , the height adjustment device further includes a connecting passage and an accumulator module, the connecting passage being connected between the central control unit and the corresponding damper, and the accumulator module including a damping adjustment accumulator 9 and an opening adjustment valve 80, the damping adjustment accumulator 9 being connected between the damper and the central control unit, and the opening adjustment valve 80 being disposed between the damping adjustment accumulator 9 and the damper. By adjusting the flow rate of oil in the corresponding connecting passage, the damping of the corresponding connecting passage can be adjusted to achieve the purpose of adjusting the damping of the hydraulic suspension system 1000, thereby adjusting the damping of the hydraulic suspension system 1000 according to actual conditions, such as road conditions, to ensure that the damping of the hydraulic suspension system 1000 meets vibration control requirements and effectively resolve the contradiction between vehicle comfort and handling stability. In some examples of the present application, the opening adjustment valve 80 includes a first motor and a first valve body, and the first motor controls the operation of the valve in the first valve body to change the flow area of ​​the first valve body, thereby achieving the purpose of flow rate adjustment.

[0096] When the opening of the aperture adjustment valve 80 becomes smaller and the amount of oil that can flow through the connecting passage decreases, the flow path from the damper to the connecting passage becomes narrower, and the damping of the damper increases. When the opening of the aperture adjustment valve 80 becomes larger, the flow path from the damper to the connecting passage becomes wider and the damping of the damper decreases. Therefore, cooperation between the damping adjustment accumulator 9 and the aperture adjustment valve 80 ensures reliable adjustment of the damping of the hydraulic suspension system 1000 and ensures that the amount of oil that can flow through the connecting passage matches the required damping.

[0097] In some embodiments of the present application, as shown in FIGS. 1 and 2 , the accumulator module includes a stiffness adjustment accumulator 10, and one stiffness adjustment accumulator 10 is provided for each set of damper assemblies 2. The stiffness adjustment accumulator 10 is connected to a connecting passage at a stiffness adjustment connection point, and a stiffness adjustment valve 11 is provided between the stiffness adjustment accumulator 10 and the stiffness adjustment connection point, allowing oil in the oil storage pot 1 to flow into the stiffness adjustment accumulator 10 for accumulation. When stiffness needs to be increased, the first control valve 3 to the fourth control valve 6 are all closed, and the stiffness adjustment valve 11 is also closed, thereby isolating the stiffness adjustment accumulator 10 from the corresponding damper 200 and improving the suspension stiffness.

[0098] As can be seen, each stiffness adjustment valve 11 can be adjusted independently, thereby allowing the front and rear stiffnesses of the hydraulic suspension system 1000 to be matched and meet the needs of different situations. For example, in the case of an anti-nose dive situation and an anti-roll situation when turning, the front axle needs to provide greater stiffness, so the stiffness adjustment valves 11 corresponding to the left front damper assembly 2 and the right front damper assembly 2 can be closed, and the stiffness adjustment valves 11 corresponding to the right rear damper assembly 2 and the left rear damper assembly 2 can be opened.

[0099] In some examples of the present application, the damping adjustment accumulator 9 uses a metal bellows accumulator, and the stiffness adjustment accumulator 10 uses a diaphragm-type accumulator, which has a faster pressure accumulation capability and a larger pressure accumulation amount than a metal bellows accumulator. Since the diaphragm-type accumulator can reach a higher pressure accumulation amount in a relatively short time, the stiffness adjustment accumulator 10 uses a diaphragm-type accumulator to accumulate pressure in each suspension to realize vehicle body lift. Note that the accumulation principles of both the metal bellows accumulator and the diaphragm-type accumulator are conventional technologies and will not be described in detail here.

[0100] 1, in some embodiments of the present application, the height adjustment device further includes a seventh control valve 12, which is disposed between the stiffness adjustment connection point and the damping adjustment accumulator 9. Specifically, the hydraulic suspension system 1000 may have a pressure boosting mode, in which the first control valve 3 to the fourth control valve 6 are all opened, the seventh control valve 12 is closed, and the stiffness adjustment valve 11 is opened, and the oil in the oil storage pot 1 flows into the stiffness adjustment accumulator 10 for accumulation.

[0101] When it is necessary to switch to the lift mode, the first control valve 3 to the fourth control valve 6 are all closed, the seventh control valve 12 is opened, and the stiffness adjustment valve 11 is opened, so that the oil in the stiffness adjustment accumulator 10 flows into the oil passage 204 and raises the piston 202. When it is necessary to switch to the height reduction mode, the first control valve 3 to the fourth control valve 6 are all opened, the seventh control valve 12 is opened, and the stiffness adjustment valve 11 is opened, so that the oil that has flowed out from the oil passage 204 of the damper 200 is returned to the oil storage pot 1. Therefore, by providing the seventh control valve 12, it is possible to accumulate oil first using the stiffness adjustment valve 11, and when lift or stiffness adjustment is necessary, this can be achieved by simply opening or closing the stiffness adjustment valve 11, resulting in a fast and reliable response.

[0102] Preferably, the hydraulic suspension system 1000 may further have an anti-nose-dive braking mode and an anti-squat acceleration mode, and while the vehicle is running, one of the first control valve 3 to the fourth control valve 6 corresponding to each set of damper assemblies 2 is controlled to be closed, the seventh control valve 12 is opened, and the stiffness adjustment valve 11 is closed, so that the oil passage 204 of each set of damper assemblies 2 communicates with the damping adjustment accumulator 9, which can adjust the amount of oil in the corresponding damper 200. Therefore, the damper 200 corresponding to each set of damper assemblies 2 has a reaction force against the movement tendency of the vehicle body at the corresponding position, and the hydraulic suspension system 1000 has the anti-nose-dive braking mode and the anti-squat acceleration mode.

[0103] As shown in FIG. 2 , in some embodiments of the present application, the reservoir further includes a central accumulator 13, and the first to fourth control valves 3 to 6 corresponding to the multiple sets of damper assemblies 2 are all connected to the central accumulator 13. That is, when the first to fourth control valves 3 to 6 are all closed, the oil in the oil storage pot 1 flows into the central accumulator 13 for accumulation. When the first to fourth control valves 3 to 6 are all opened, the oil in the central accumulator 13 can flow into the oil passages 204 of each set of damper assemblies 2. Thus, the provision of the central accumulator 13 allows the oil to be accumulated by first increasing the pressure, ensuring that the oil can reliably flow into each set of damper assemblies 2, and facilitating further adjustment of the damping system and stiffness coefficient of the hydraulic suspension system 1000. As shown in FIG. 2 , in lift mode, the oil in the central accumulator 13 can flow into the oil passages 204.

[0104] 1 and 2, in some embodiments of the present application, each damper assembly 2 is provided with one corresponding pressure-reducing accumulator 30, and each pressure-reducing accumulator 30 is connected to a corresponding oil passage 204. Therefore, when the vehicle is subjected to a jolt or shock while traveling, the oil in the lower chamber 2012 of each damper assembly 2 flows through the oil passage 204 into the pressure-reducing accumulator 30 and accumulates, thereby achieving a rapid pressure reduction.

[0105] 1 to 4, in some embodiments of the present application, each set of damper assemblies 2 includes a vibration damping spring 205, and both ends of the vibration damping spring 205 are configured to connect to the vehicle body and the axle. Therefore, by providing the vibration damping spring 205, the cushioning effect of each set of damper assemblies 2 can be increased, and vibration of the vehicle body while the vehicle is running can be reduced.

[0106] Preferably, as shown in Figures 1 to 4, the vibration damping spring 205 of the left front damper assembly 2 is fitted and fixed to the outside of the damper 200, the vibration damping spring 205 of the right front damper assembly 2 is fitted and fixed to the outside of the damper 200, the vibration damping spring 205 of the left rear damper assembly 2 is arranged in parallel with the damper 200, and the vibration damping spring 205 of the right rear damper assembly 2 is arranged in parallel with the damper 200.

[0107] Hereinafter, referring to Figures 1 and 2, the hydraulic suspension system 1000 according to two specific examples of the present application will be described in detail. To facilitate understanding, the above examples are merely illustrative and not limiting, and each example can be modified exemplarily according to actual circumstances. [Example]

[0108] As shown in FIG. 1, a hydraulic suspension system 1000 according to an embodiment of the present application includes a left front damper assembly 2, a right front damper assembly 2, a left rear damper assembly 2, a right rear damper assembly 2, an oil storage pot 1, a control pump 26, an oil return valve 27, a check valve 28, a pressure retention accumulator 29, a relief valve 31, an opening adjustment valve 80, a damping adjustment accumulator 9, a stiffness adjustment accumulator 10, a pressure reduction accumulator 30, a central control device 24, a first connecting passage, and a second connecting passage.

[0109] The left front damper assembly 2 and the right front damper assembly 2 both include a damper 200 and a vibration damping spring 205, and the vibration damping spring 205 is fitted and fixed to the outside of the damper 200. The left rear damper assembly 2 and the right rear damper assembly 2 both include a damper 200 and a vibration damping spring 205, and the vibration damping spring 205 is provided in parallel with the damper 200, and both ends of the vibration damping spring 205 of the left rear damper assembly 2 are connected to the vehicle body and the axle, respectively. Both ends of the vibration damping spring 205 of the right rear damper assembly 2 are connected to the vehicle body and the axle, respectively. Each damper 200 includes a damper housing 201, a piston rod 203, and a piston 202. The piston rod 203 is connected to the piston 202. The piston 202 is movably provided within the damper housing 201 to divide an upper chamber 2011 and a lower chamber 2012. An oil passage 204 is provided within the piston rod 203, and the oil passage 204 is connected to the lower chamber 2012. The central control device is connected to the oil storage pot 1 by a third connecting passage, and the first control valve 3 to the fourth control valve 6 are provided in the corresponding third connecting passages.

[0110] The oil storage pot 1 has an oil outlet and an oil inlet. The control pump 26 is connected to the oil outlet and the third connecting passage, respectively, to guide the oil in the oil storage pot 1 to the third connecting passage. The oil return valve 27 is connected to the oil inlet and the third connecting passage, respectively. When the oil return valve 27 is opened, the oil flows from the third connecting passage to the oil inlet. The check valve 28 is provided at the outlet end of the control pump 26 and is unidirectional. The pressure holding accumulator 29 is provided at the outlet end of the control pump 26 and is located between the check valve 28 and the control pump 26. The pressure holding accumulator 29 can stabilize and eliminate flow rate fluctuations at the outlet end of the control pump 26.

[0111] The hydraulic suspension system 1000 includes a common flow path and four branch flow paths, and the four branch flow paths are respectively connected to the oil passages 204 of the four damper assemblies 2. The check valve 28 and the oil return valve 27 are each connected to the common flow path. The relief valve 31 is also connected to the common flow path.

[0112] The first control valve 3 to the fourth control valve 6 are connected in series in one-to-one correspondence with the four branch flow paths, and the first control valve 3 to the fourth control valve 6 control the conduction or blocking of the corresponding branch flow paths.

[0113] The stiffness adjustment accumulator 10 corresponding to each damper assembly 2 is connected to the corresponding branch flow path, and a stiffness adjustment valve 11 is provided at the oil inlet and outlet of the stiffness adjustment accumulator 10, and the stiffness adjustment valve 11 is normally closed.

[0114] Each branch flow path is further provided with an opening adjustment valve 80, a damping adjustment accumulator 9, and a seventh control valve 12. The opening adjustment valve 80 adjusts the flow rate through the corresponding branch flow path to adjust the damping of the hydraulic suspension system 1000. The damping adjustment accumulator 9 is capable of accumulation. The seventh control valve 12 is provided between the damping adjustment accumulator 9 and the stiffness adjustment accumulator 10.

[0115] One pressure-reducing accumulator 30 is provided corresponding to each damper assembly 2, and the pressure-reducing accumulator 30 corresponding to the left front damper assembly 2 is directly connected to the piston rod 203 and communicates with the corresponding oil passage 204, and the pressure-reducing accumulator 30 corresponding to the right front damper assembly 2 is directly connected to the piston rod 203 and communicates with the corresponding oil passage 204. The pressure-reducing accumulator 30 corresponding to the left rear damper assembly 2 is connected to the corresponding branch passage, and the pressure-reducing accumulator 30 corresponding to the right rear damper assembly 2 is directly connected to the corresponding branch passage.

[0116] Specifically, the hydraulic suspension system 1000 has a pressure increase mode, a lift mode, and a height decrease mode, and in the pressure increase mode, the first control valve 3 to the fourth control valve 6 are all opened, the seventh control valve 12 is closed, the stiffness adjustment valve 11 is opened, and the control pump 26 is operated, so that the oil in the oil storage pot 1 flows through the four branch flow paths into the corresponding stiffness adjustment accumulators 10 and is accumulated. After accumulating using each stiffness adjustment accumulator 10, the stiffness adjustment valve 11 is closed.

[0117] In lift mode, the oil in the oil storage pot 1 can flow into the oil passages 204 of the left front damper assembly 2, the oil passages 204 of the right front damper assembly 2, the oil passages 204 of the left rear damper assembly 2, and the oil passages 204 of the right rear damper assembly 2. The oil that flows into each oil passage 204 flows into the lower chamber 2012, which increases the oil pressure in the lower chamber 2012, causing the piston 202 to move upward, which in turn moves the piston rod 203 upward. The piston rod 203 of the left front damper assembly 2 moves upward, the piston rod 203 of the right front damper assembly 2 moves upward, the piston rod 203 of the left rear damper assembly 2 moves upward, and the piston rod 203 of the right rear damper assembly 2 moves upward, moving the vehicle body upward and achieving the purpose of lifting the vehicle body.

[0118] In the height reduction mode, oil can flow out of the oil passages 204 of the left front damper assembly 2, the right front damper assembly 2, the left rear damper assembly 2, and the right rear damper assembly 2, respectively, so that the oil pressure in the lower chamber 2012 of each damper 200 decreases, causing the pistons 202 to move downward, which in turn moves the piston rods 203 downward. The piston rod 203 of the left front damper assembly 2 moves downward, the piston rod 203 of the right front damper assembly 2 moves downward, the piston rod 203 of the left rear damper assembly 2 moves downward, and the piston rod 203 of the right rear damper assembly 2 moves downward, moving the vehicle body downward and achieving the purpose of reducing the vehicle height. As can be seen, in height reduction mode, the oil flowing out of each set of damper assemblies 2 may flow directly into the oil storage pot 1, may flow into the accumulator assembly for accumulation, or may flow into the oil storage pot 1 and the accumulator assembly simultaneously.

[0119] When the pressure in the hydraulic suspension system 1000 is high, for example, when it is detected that the pressure at the outlet of the control pump 26 reaches a certain threshold (30 MPa), the oil return valve 27 is opened and relieved to protect the hydraulic suspension system 1000 within the normal pressure range, and at this time, the oil in each damper 200 can flow into the oil storage pot 1.

[0120] After the relief, if the pressure in the hydraulic suspension system 1000 is still high or the pressure is high during operation, the relief valve 31 can be opened to relieve the pressure, thereby ensuring the reliability of the entire hydraulic suspension system 1000.

[0121] If the damping of hydraulic suspension system 1000 is too great while the vehicle is running, causing the vehicle body to shake and affect comfort, the amount of oil in each branch passage can be adjusted by using aperture control valve 80 to adjust the damping of hydraulic suspension system 1000. When the aperture of aperture control valve 80 is reduced and the passage from the damper to the connecting passage becomes narrower, the damping of the damper increases. When the aperture of aperture control valve 80 is increased, the passage from the damper to the connecting passage becomes wider, reducing the damping of the damper, and the damping of the hydraulic suspension system 1000 can be reliably adjusted.

[0122] If the stiffness of the hydraulic suspension system 1000 is too high and reduces the comfort of the vehicle, the stiffness adjustment valve 11 can be controlled to open and the oil in the stiffness adjustment accumulator 10 can be replenished into each branch flow path, thereby reducing the stiffness of the hydraulic suspension system 1000 and increasing the damping effect of the hydraulic suspension system 1000 against vibrations.

[0123] When the vehicle is subjected to a jolt or impact while it is traveling, the oil in the lower chamber 2012 of each damper assembly 2 flows through the oil passage 204 into the pressure-reducing accumulator 30 to accumulate, thereby achieving rapid pressure reduction. Since the front axle of the vehicle is responsible for ensuring driving stability and the rear axle of the vehicle is primarily responsible for ensuring comfort, the pressure-reducing accumulator 30 corresponding to the left front damper assembly 2 is directly connected to the piston rod 203 and communicates with the corresponding oil passage 204, and the pressure-reducing accumulator 30 corresponding to the right front damper assembly 2 is directly connected to the piston rod 203 and communicates with the corresponding oil passage 204, thereby achieving rapid relief.

[0124] The central control unit 24 includes a housing 240 and a movable member 241, which is movably disposed within the housing 240 and cooperates with the housing 240 to define a first chamber 243, a second chamber 244, a third chamber 245 and a fourth chamber 246, which are arranged in order in the direction of movement of the movable member 241, with the first chamber 243 and the second chamber 244 being distributed on one side of a first portion 2411 of the movable member 241, and the third chamber 245 and the fourth chamber 246 being distributed on the other side of the first portion 2411, and the first portion 2411 being movably engaged with the inner wall of the housing 240.

[0125] The oil passage 204 of the left front damper assembly 2 is connected to one of the first chamber 243 and the second chamber 244, and the oil passage 204 of the right rear damper assembly 2 is connected to the other of the first chamber 243 and the second chamber 244. The oil passage 204 of the left rear damper assembly 2 is connected to one of the third chamber 245 and the fourth chamber 246, and the oil passage 204 of the right front damper assembly 2 is connected to the other of the third chamber 245 and the fourth chamber 246. For convenience of explanation, the following description will be given using an example in which the oil passage 204 of the left front damper assembly 2 is connected to the first chamber 243, the oil passage 204 of the right rear damper assembly 2 is connected to the second chamber 244, the oil passage 204 of the left rear damper assembly 2 is connected to the third chamber 245, and the oil passage 204 of the right front damper assembly 2 is connected to the fourth chamber 246.

[0126] Specifically, when the vehicle tends to roll, for example, when the piston rods 203 of the left front damper assembly 2 and the left rear damper assembly 2 are compressed and the piston rods 203 of the right front damper assembly 2 and the right rear damper assembly 2 are pulled, the oil in the lower chamber 2012 of the left front damper assembly 2 flows into the first chamber 243 through the oil passage 204, and the oil in the lower chamber 2012 of the left rear damper assembly 2 flows into the third chamber 245 through the oil passage 204, and the oil in the first chamber 243 flows into the third chamber 245 through the oil passage 204. Since the spring 243 and the third chamber 245 are located on both sides of the first part 2411, the direction of the force of the oil in the first chamber 243 acting on the first part 2411 is opposite to the direction of the force of the third chamber 245 acting on the first part 2411, and the two opposite acting forces cancel each other out, so the moving member 241 does not move, which suppresses the movement of the piston rod 203 of the left front damper assembly 2 and the piston rod 203 of the left rear damper assembly 2, thereby suppressing roll.

[0127] When the left front wheel of the vehicle encounters an obstacle such as a stone, the left front wheel is lifted and the compression width of the left front damper assembly 2 becomes greater than the compression width of the left rear damper assembly 2. In this case, the amount of oil flowing from the left front damper assembly 2 into the first chamber 243 becomes greater than the amount of oil flowing from the left rear damper assembly 2 into the third chamber 245. As a result, the moving member 241 moves to the right and presses the third chamber 245 and the fourth chamber 246. The oil in the third chamber 245 flows into the lower chamber 2012 of the left rear damper assembly 2 and moves the piston rod 203 upward. The oil in the fourth chamber 246 flows into the lower chamber 2012 of the right front damper assembly 2 and moves the piston rod 203 upward. This increases the distance between the right front wheel and the left rear wheel and the vehicle body, reduces the lean width of the vehicle, and prevents the vehicle from rolling.

[0128] Of course, it can be understood that the above several situations are merely illustrative, and when the vehicle encounters other situations such as right front wheel lift, left rear wheel lift, etc., the oil will flow in accordance with the above interlocking principle to prevent the vehicle from rolling, and each situation will not be described in detail here.

[0129] The first connecting passages are connected to the oil passages 204 of the left front damper assembly 2 and the right front damper assembly 2, respectively, and the first connecting passages are provided with fifth control valves 7 for connecting or disconnecting the first connecting passages.

[0130] The second connecting passages are connected to the oil passages 204 of the left rear damper assembly 2 and the right rear damper assembly 2, respectively, and the second connecting passages are provided with a sixth control valve 8 for connecting or disconnecting the second connecting passages.

[0131] Specifically, when the fifth control valve 7 is opened, the first connecting passage is opened, and when the fifth control valve 7 is closed, the first connecting passage is shut off. When the sixth control valve 8 is opened, the second connecting passage is opened, and when the sixth control valve 8 is closed, the second connecting passage is shut off.

[0132] When it is necessary to maintain the vehicle body height, hydraulic suspension system 1000 switches to height maintenance mode, fifth control valve 7 and sixth control valve 8 are both opened, the first connecting passage and the second connecting passage are connected, oil passage 204 of left front damper assembly 2 is connected to oil passage 204 of right front damper assembly 2, and oil passage 204 of left rear damper assembly 2 is connected to oil passage 204 of left rear damper assembly 2. In other words, piston rod 203 of left front damper assembly 2 is in an interlocking state with piston rod 203 of right front damper assembly 2, and piston rod 203 of left rear damper assembly 2 is in an interlocking state with piston rod 203 of left rear damper assembly 2, thereby enabling the current height of the vehicle body to be maintained as much as possible. [Example]

[0133] As shown in FIG. 2, in this embodiment, the hydraulic suspension system 1000 according to the embodiment of the present application does not include the seventh control valve 12 compared to the embodiment, and the hydraulic suspension system 1000 includes a central accumulator 13.

[0134] In this embodiment, in the pressure increasing mode, the oil in the oil storage pot 1 flows into the central accumulator 13 and the stiffness adjusting accumulator 10 and accumulates there.

[0135] The modes of the hydraulic suspension system 1000 according to this embodiment are the same as those in the first embodiment, and will not be described here.

[0136] A vehicle according to an embodiment of the present application includes the hydraulic suspension system 1000 described in any one of the above embodiments of the present application.

[0137] In the vehicle according to the embodiment of the present application, the central control unit 24 and the plurality of height adjustment devices can suppress the roll of the vehicle when the vehicle has a tendency to roll. When the heights of the four wheels of the vehicle are not the same, the height of the vehicle body can be adjusted to reduce the tilt width of the vehicle, thereby preventing the vehicle from rolling.

[0138] In the description of this application, the orientations or positional relationships indicated by terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" are based on the orientations or positional relationships shown in the drawings, and are intended merely to facilitate and simplify the description of this application. They do not indicate or suggest that the devices or elements shown must have a specific orientation, be configured, and operate in a specific orientation, and therefore should not be understood as limiting this application.

[0139] Additionally, the terms "first" and "second" are for descriptive purposes only and should not be understood to indicate or suggest relative importance or to imply the number of technical features shown. Thus, a feature qualified with "first" or "second" may explicitly or implicitly include one or more of the feature. In the description of this application, "plurality" means two or more unless explicitly and specifically limited.

[0140] In this application, unless otherwise clearly specified or limited, the terms "attached," "coupled," "connected," "fixed," etc. should be understood in a broad sense, and for example, unless otherwise clearly limited, may refer to a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediate medium, an internal communication between two parts, or an interactive relationship between two parts. Those skilled in the art can understand the specific meaning of the above terms in this application according to specific circumstances.

[0141] In this application, unless otherwise clearly specified or limited, a first feature being "above" or "below" a second feature may include direct contact between the first and second features, or indirect contact between the first and second features via an intermediate medium. Furthermore, a first feature being "above," "above," or "on the upper surface" of a second feature may include the first feature being directly above or diagonally above the second feature, or may simply mean that the horizontal height of the first feature is higher than that of the second feature. A first feature being "below," "below," or "on the lower surface" of a second feature may include the first feature being directly below or diagonally below the second feature, or may simply mean that the horizontal height of the first feature is lower than that of the second feature.

[0142] In the description herein, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples" mean that the specific features, structures, materials, or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present application. In the description herein, the exemplary expressions of the above terms are not necessarily limited to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be appropriately combined in any one or more embodiments or examples. Furthermore, if not mutually inconsistent, a person skilled in the art may combine or combine different embodiments or examples described herein and features of different embodiments or examples.

[0143] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are illustrative and should not be construed as limiting the present application, and that those skilled in the art may make changes, modifications, substitutions and variations to the above embodiments within the scope of the present application. [Explanation of symbols]

[0144] 1000 Hydraulic Suspension System 1 oil storage pot 2 Damper Assembly 200 Damper 201 Damper housing 2011 Upper Chamber 2012 Lower Chamber 202 Piston 203 Piston rod 204 Oil passage 205 vibration damping spring 3. First control valve 4. Second control valve 5. Third control valve 6. Fourth control valve 7. Fifth control valve 8. Sixth Control Valve 80 Opening adjustment valve 9 Damping adjustment accumulator 10 Stiffness adjustment accumulator 101 Metal Bellows 11 Stiffness adjustment valve 12 Seventh control valve 13 Central Accumulator 32 Central pressure regulator 24 Central Control Unit 240 Housing 241 Moving parts 2410 First Part 2411 Second Part 2412 Third Part 243 First Chamber 244 Second Chamber 245 Third Chamber 246 Fourth Chamber 247 First return spring 248 Second return spring 249 Guide Unit 2490 First guide member 2491 Second guide member 2401 First connection port 24011 First port 24012 Secondary Port 24013 Third Port 24014 4th port 2402 Second connection port 24021 5th Port 24022 6th Port 24023 7th Port 24024 8th port 2403 First Cylinder 2404 Second Cylinder 2405 Third Cylinder 26 Control pump 260 Control valve body 261 Drive motor 27 Oil return valve 28 Check valve 29 Pressure-retaining accumulator 30 Pressure reducing accumulator 31 Relief valve

Claims

1. a plurality of height adjustment devices and a central control device, the plurality of height adjustment devices being provided in one-to-one correspondence with the plurality of wheels of the vehicle; the central control device includes a housing and a moving member, the moving member being movably disposed within the housing and dividing the housing into a first region and a second region in a moving direction of the moving member, the first region including a first chamber and a second chamber isolated from each other, and the second region including a third chamber and a fourth chamber isolated from each other; the first chamber, the second chamber, the third chamber, and the fourth chamber communicate with the plurality of height adjustment devices in a one-to-one correspondence, the wheels corresponding to the height adjustment devices communicating with the first chamber and the second chamber are positioned diagonally, and the wheels corresponding to the height adjustment devices communicating with the third chamber and the fourth chamber are also positioned diagonally; the central control device is provided with a first connection port, the height adjustment device includes a reservoir and a damper, the damper is provided corresponding to a wheel, the reservoir supplies oil to the damper, and the first connection port is in communication with the damper; a plurality of first connection ports are provided, and include a first port, a second port, a third port, and a fourth port, and the first port, the second port, the third port, and the fourth port communicate with the first chamber, the second chamber, the third chamber, and the fourth chamber, respectively; the central control device further includes a second connection port, the second connection port configured to communicate with the reservoir; a plurality of the second connection ports are provided, including a fifth port, a sixth port, a seventh port, and an eighth port, and the fifth port, the sixth port, the seventh port, and the eighth port communicate with the first chamber, the second chamber, the third chamber, and the fourth chamber, respectively; Hydraulic suspension system.

2. 2. The hydraulic suspension system of claim 1, wherein a volume change of the first chamber and the second chamber in the first region is opposite to a volume change of the third chamber and the fourth chamber in the second region.

3. The hydraulic suspension system according to claim 1 , wherein the first chamber, the second chamber, the third chamber, and the fourth chamber are provided in order along the moving direction of the moving member.

4. 2. The hydraulic suspension system of claim 1, wherein, initially, the first chamber and the fourth chamber have the same volume, and the second chamber and the third chamber have the same volume.

5. 2. The hydraulic suspension system of claim 1, wherein one of the front axle height adjuster and the rear axle height adjuster communicates with the first chamber and the third chamber, and the other of the front axle height adjuster and the rear axle height adjuster communicates with the second chamber and the fourth chamber.

6. 2. The hydraulic suspension system of claim 1, wherein one of the front axle height adjuster and the rear axle height adjuster communicates with the first chamber and the fourth chamber, and the other of the front axle height adjuster and the rear axle height adjuster communicates with the second chamber and the third chamber.

7. 2. The hydraulic suspension system according to claim 1, wherein an axis of the first connection port is perpendicular to an axis of the second connection port.

8. 2. The hydraulic suspension system of claim 1, further comprising a first control valve, a second control valve, a third control valve, and a fourth control valve, wherein the first control valve is provided between the fifth port and the reservoir, the second control valve is provided between the sixth port and the reservoir, the third control valve is provided between the seventh port and the reservoir, and the fourth control valve is provided between the eighth port and the reservoir.

9. 9. The hydraulic suspension system of claim 8, wherein the control valves include the first control valve, the second control valve, the third control valve, and the fourth control valve, and the control valves selectively communicate the second connection port and the damper with the reservoir.

10. 9. The hydraulic suspension system according to claim 8, wherein a first connecting passage is provided between the first control valve and the fourth control valve, and a fifth control valve is provided in the first connecting passage, and a second connecting passage is provided between the second control valve and the third control valve, and a sixth control valve is provided in the second connecting passage.

11. 2. The hydraulic suspension system of claim 1, wherein the moving member includes a first portion, a second portion, and a third portion, the first portion moving axially along a side wall of the housing to divide the housing into the first region and the second region, the second portion connected to one side of the first portion and moving along the side wall of the housing to divide the first region into the first chamber and the second chamber, and the third portion connected to the other side of the first portion and moving along the side wall of the housing to divide the second region into the third chamber and the fourth chamber.

12. 12. The hydraulic suspension system of claim 11, wherein the housing includes a first cylinder, a second cylinder, and a third cylinder arranged in that order along the movement direction of the moving member, the inner diameter of the second cylinder being larger than the inner diameter of the first cylinder and larger than the inner diameter of the third cylinder, the first chamber being formed between the second portion and the inner wall of the first cylinder, the first portion being in contact with the inner wall of the second cylinder to divide the second cylinder into the second chamber and the third chamber, and the fourth chamber being formed between the third portion and the inner wall of the third cylinder.

13. 12. The hydraulic suspension system according to claim 11, wherein an extension direction of the first portion is perpendicular to an extension direction of the second portion, and the extension direction of the second portion and the third portion are provided symmetrically with respect to the first portion.

14. 12. The hydraulic suspension system of claim 11, wherein the first chamber and the second chamber are located on one side of the first portion, and the third chamber and the fourth chamber are located on the other side of the first portion.

15. 2. The hydraulic suspension system according to claim 1, wherein a return spring is provided between the moving member and the end wall of the housing.

16. 2. The hydraulic suspension system of claim 1, wherein the damper has a damper housing, a piston, and a piston rod, the damper housing configured to be connected to a wheel, the piston located within the damper housing and cooperating with the damper housing to define an upper chamber and a lower chamber, one end of the piston rod connected to the piston, the piston rod configured to be connected to a vehicle body, an oil passage provided within the piston rod, the oil passage communicating with the lower chamber, and the reservoir supplying oil to the damper via the oil passage.

17. The height adjustment device further includes a connecting passage and an accumulator module, the connecting passage communicating between the central control device and the corresponding damper; 2. The hydraulic suspension system of claim 1, wherein the accumulator module includes a damping adjustment accumulator and an opening adjustment valve, the damping adjustment accumulator being connected between the damper and the central control device, and the opening adjustment valve being provided between the damping adjustment accumulator and the damper.

18. 18. The hydraulic suspension system of claim 17, wherein the accumulator module further includes a stiffness adjustment accumulator and a stiffness adjustment valve, the connecting passage being provided with a stiffness adjustment connection point, the stiffness adjustment accumulator communicating with the stiffness adjustment connection point, and the stiffness adjustment valve being provided between the stiffness adjustment accumulator and the stiffness adjustment connection point.

19. 20. The hydraulic suspension system of claim 18, wherein the height adjuster further includes a seventh control valve, the seventh control valve being disposed between the stiffness adjustment node and the damping adjustment accumulator.

20. 2. The hydraulic suspension system according to claim 1, wherein the central control unit is a cylinder structure.

21. A vehicle comprising a hydraulic suspension system according to any one of claims 1 to 20.

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