Hydraulic active suspension and vehicles having the same

Abstract

A hydraulic active suspension (1000) for use in a vehicle includes a damper (200), a common passage, an accumulator module, and a reservoir, the damper (200) having a housing (201), a piston (202), and a piston rod (203), the housing (201) is configured to be connected to a wheel or an axle, the piston (202) is located within the housing (201) and defines an upper chamber (2011) and a lower chamber (2012) of the damper (200), one end of the piston rod (203) is connected to the piston (202), and the other end of the piston rod (203) extends from the housing (201) and is configured to be connected to a vehicle body, the reservoir and the accumulator module are both in communication with the lower chamber (2012) via the common passage, the reservoir adjusts the height of the vehicle, and the accumulator module adjusts at least one of the stiffness and damping of the damper (200).

Description

Technical Field

[0001] (Cross-reference to related applications) This application is based on and claims the priority of a Chinese patent application with the application number 202123435005.1, filed on December 30, 2021, and all of its contents are incorporated herein by reference.

[0002] This application relates to the field of vehicles, and particularly to a hydraulic active suspension and a vehicle having the same.

Background Art

[0003] A suspension is a device that transmits the interaction force between the vehicle body and the axle, and is one of the four main components of an automobile, and is an important component that affects the driving performance of the automobile. The suspension transmits the acting force and moment feedback from the road surface, attenuates the vibration of the wheels, alleviates the impact, and improves the driving experience of the driver, so that the vehicle can obtain ideal motion characteristics and stable driving ability. The suspension of the related technology is often composed of a spring, a guide mechanism, a damper, etc. The damper has a constant damping coefficient and a constant rigidity of the spring, and it is difficult to achieve both comfort and operation stability.

Summary of the Invention

Problems to be Solved by the Invention

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

[0005] For this purpose, this application aims to provide a hydraulic active suspension that effectively solves the contradiction between the comfort and the handling stability of the vehicle, has a compact overall structure, and facilitates the spatial installation of the entire vehicle.

[0006] This application further provides a vehicle having the above hydraulic active suspension. [Means for solving the problem]

[0007] An embodiment of the present invention provides a hydraulic active suspension for use in a vehicle, comprising a damper, a common passage, an accumulator module, and a reservoir, wherein the damper has a housing, a piston, and a piston rod, the housing is configured to be connected to a wheel or axle, the piston is located within the housing and defines an upper chamber and a lower chamber of the damper, one end of the piston rod is connected to the piston, and the other end of the piston rod extends from the housing and is configured to be connected to the vehicle body, the reservoir and the accumulator module both communicate with the lower chamber via the common passage, the reservoir adjusts the height of the vehicle, and the accumulator module adjusts at least one of the stiffness and damping of the damper.

[0008] The hydraulic active suspension according to the embodiment of the present invention can adjust the height of the vehicle body, improve the vehicle's handling stability without compromising vehicle comfort, effectively resolving the conflict between vehicle comfort and handling stability, and further adjust the rigidity and damping, making the vehicle equipped with the hydraulic active suspension run more smoothly. In addition, the flow path between the reservoir and the lower chamber overlaps with the flow path between the accumulator module and the lower chamber, that is, the conduit for adjusting the height of the vehicle body overlaps with the conduit for adjusting the rigidity and damping, thus reducing the number of connecting conduits, making the overall structure of the hydraulic active suspension more compact, and facilitating installation in the space of the entire vehicle.

[0009] In some embodiments of the present application, the first end of the common passage communicates with the lower chamber, the second end of the common passage communicates with the reservoir, a module connection point is provided in the common passage, the module connection point is located between the first end and the second end and connects the accumulator modules.

[0010] In some embodiments of the present invention, the common passage is provided with a first control valve located between the second end and the module connection point.

[0011] In some embodiments of the present application, the module connection location includes a first connection point, the accumulator module includes a first accumulator and a second control valve, the first accumulator communicates with the first connection point, the second control valve is provided between the first connection point and the lower chamber, the second control valve is one of a regulating valve, a shut-off valve and a shut-off regulating valve, if the second control valve is a regulating valve, it adjusts the opening degree to adjust the damping of the damper, if the second control valve is a shut-off valve, it adjusts the rigidity, and if the second control valve is a shut-off regulating valve, it adjusts the rigidity and damping of the damper.

[0012] In some embodiments of the present application, the module connection point further includes a second connection point, the accumulator module includes a second accumulator and a third control valve, the second accumulator communicates with the second connection point, and the third control valve is provided between the second accumulator and the second connection point and can selectively communicate the second accumulator and the second connection point.

[0013] In some embodiments of the present application, the module connection location includes a first connection point and a second connection point, the accumulator module includes a first accumulator, a second accumulator, a second control valve and a third control valve, the first accumulator is connected to the first connection point, the second accumulator is connected to the second connection point, the second control valve is connected between the first connection point and the lower chamber, the third control valve is provided between the second accumulator and the second connection point, the second control valve is an adjustment valve for adjusting the damping of the damper, and the third control valve is a shut-off valve for adjusting the stiffness of the damper.

[0014] In some embodiments of the present application, the first connection point is provided on the side of the second connection point that is away from the second end.

[0015] In some embodiments of the present invention, a fourth control valve is provided between the first connection point and the second connection point.

[0016] In some embodiments of the present application, the damper is a front axle damper, a third connection point is provided between the module connection point and the first end, and the hydraulic active suspension further includes a third accumulator communicating with the third connection point.

[0017] In some embodiments of the present application, the damper is a rear axle damper, the module connection point further includes a third connection point located between the first connection point and the second connection point, and the accumulator module includes a third accumulator communicating with the third connection point.

[0018] The vehicle according to the embodiment of the present application is characterized by including a hydraulic active suspension as described in any of the above embodiments of the present application.

[0019] In the embodiment of the present invention, by providing the hydraulic active suspension of any of the above embodiments, the height of the vehicle body can be adjusted, improving the vehicle's handling stability without compromising the vehicle's comfort, effectively resolving the conflict between vehicle comfort and handling stability, and further adjusting the rigidity and damping, making the vehicle equipped with the hydraulic active suspension run more smoothly. In addition, the flow path between the reservoir and the lower chamber overlaps with the flow path between the accumulator module and the lower chamber, that is, the conduit for adjusting the vehicle body height and the conduit for adjusting the rigidity and damping overlap, thus reducing the number of connecting conduits, making the overall structure of the hydraulic active suspension more compact, and facilitating installation in the space of the entire vehicle.

[0020] Additional aspects and advantages of the present application are, in part, shown in the following description, and in part, become apparent in the following description or are understood through the practice of the present application. [Brief explanation of the drawing]

[0021] [Figure 1] It is a schematic diagram of a hydraulic active suspension according to an embodiment of the present application. [Figure 2] It is a schematic diagram of a damper according to an embodiment of the present application.

Mode for Carrying Out the Invention

[0022] Hereinafter, embodiments of the present application will be described in detail. Examples of the above embodiments are shown in the drawings, and the same or similar reference numerals throughout indicate the same or similar components, or components having the same or similar functions. The embodiments described below with reference to the drawings are merely exemplary and are for the purpose of interpreting the present application and should not be understood as limiting the present application.

[0023] Referring to FIGS. 1 and 2, a hydraulic active suspension 1000 according to an embodiment of the present application will be described. The hydraulic active suspension 1000 is used in a vehicle, provided on a vehicle body, and further connected to a wheel or an axle.

[0024] As shown in FIGS. 1 and 2, the hydraulic active suspension 1000 according to an embodiment of the present application includes a damper 200, a common passage, an accumulator module, and a reservoir. The damper 200 has a housing 201, a piston 202, and a piston rod 203. The housing 201 is configured to be connected to a wheel or an axle. The piston 202 is located within the housing 201 and defines an upper chamber 2011 and a lower chamber 2012 of the damper 200. One end of the piston rod 203 is connected to the piston 202, and the other end of the piston rod 203 extends from the housing 201 and is configured to be connected to the vehicle body. Both the reservoir and the accumulator module communicate with the lower chamber 2012 via a common passage. The reservoir adjusts the vehicle body height, and the accumulator module adjusts at least one of the rigidity and damping of the damper 200.

[0025] Specifically, the reservoir communicates with the lower chamber 2012 via a common passage, and the accumulator module also communicates with the lower chamber 2012 via the common passage. That is, the flow path between the reservoir and the lower chamber 2012 overlaps with the flow path between the accumulator module and the lower chamber 2012. That is, the pipeline for adjusting the height of the vehicle body overlaps with the pipeline for adjusting rigidity and damping. The common passage can not only realize the adjustment of the vehicle body height, but also realize at least one of rigidity and damping adjustments. Therefore, the number of connecting pipelines can be reduced, the structure of the entire hydraulic active suspension 1000 can be made compact, and the space installation of the entire vehicle can be facilitated.

[0026] Also, as can be understood, the oil in the reservoir can enter the lower chamber 2012 through the common passage. When the volume in the lower chamber 2012 decreases due to the downward movement of the piston rod 203, the oil in the lower chamber 2012 can also be discharged to the reservoir through the common passage.

[0027] Specifically, the hydraulic active suspension 1000 has a lift mode and a height reduction mode. In the lift mode, the oil in the reservoir can enter the common passage, and the hydraulic oil entering the common passage flows into the lower chamber 2012, thereby increasing the hydraulic pressure in the lower chamber 2012 and moving the piston 202 upward. When the piston 202 moves upward, the piston rod 203 is moved upward to achieve the purpose of lifting the vehicle body.

[0028] In the height reduction mode, the oil can flow out of the lower chamber 2012 and flow to the reservoir through the common passage. The hydraulic pressure in the lower chamber 2012 of the damper 200 drops to move the piston 202 downward. When the piston 202 moves downward, the piston rod 203 is moved downward to move the vehicle body downward and achieve the purpose of reducing the height of the vehicle body.

[0029] Vehicles encounter various road conditions while driving, and since the vehicle's suspension system, after being selected in relation to the relevant technology, cannot be adjusted while the vehicle is in motion, conventional suspensions can only guarantee that the vehicle achieves an optimal performance match under specific road and speed conditions, passively receive the forces acting on the vehicle body from the ground, cannot change the suspension parameters according to the road and vehicle speed, and furthermore, cannot actively control the forces acting on the vehicle body from the ground.

[0030] The hydraulic active suspension 1000 according to the embodiment of the present invention can adjust the height of the vehicle body according to road conditions, for example, when passing through a steep mountain road, it can enter lift mode to raise the vehicle's center of gravity and improve the stability of the vehicle's driving. When it is necessary to reduce the impact of the vehicle body on the driving speed, it can enter height reduction mode to lower the vehicle's center of gravity. Of course, as can be understood, the above is merely an illustrative description, and the height of the vehicle body may be adjusted according to the actual needs during driving.

[0031] The accumulator module plays a role in storing energy; that is, oil flows into the accumulator module to store energy, and when there is demand for the hydraulic active suspension 1000, the oil in the accumulator module is discharged to replenish it.

[0032] Specifically, when the accumulator module adjusts the damping of the damper 200, the damping can be adjusted by adjusting the flow rate of oil in the common passage (i.e., the amount of oil entering the damper 200). When the accumulator module adjusts the stiffness of the damper 200, it can choose to either connect the common passage and the accumulator module, or block the communication between the accumulator module and the common passage. This increases the adjustment capabilities of the hydraulic active suspension 1000, making the driving of the vehicle equipped with the hydraulic active suspension 1000 smoother.

[0033] The hydraulic active suspension 1000 according to the embodiment of the present invention can adjust the height of the vehicle body, improve the vehicle's handling stability without compromising vehicle comfort, effectively resolving the conflict between vehicle comfort and handling stability, and further adjust the rigidity and damping, making the vehicle equipped with the hydraulic active suspension 1000 run more smoothly. In addition, since the flow path between the reservoir and the lower chamber 2012 and the flow path between the accumulator module and the lower chamber 2012 overlap, the number of connecting pipes is reduced, making the overall structure of the hydraulic active suspension 1000 more compact and facilitating its installation in the overall space of the vehicle.

[0034] In some embodiments of the present invention, the first end of the common passage communicates with the lower chamber 2012, the second end of the common passage communicates with the reservoir, and a module connection point is provided in the common passage, which is located between the first and second ends and connects the accumulator module. In other words, since the accumulator module is connected to the connection path between the reservoir and the damper, the number of connecting lines can be further reduced, making the overall structure of the hydraulic active suspension 1000 more compact.

[0035] Preferably, as shown in Figure 1, a first control valve 3 is provided in the common passage between the second end and the module connection point. Therefore, by providing the first control valve 3, when the first control valve 3 is closed, communication between the reservoir and the accumulator module is cut off, and the oil in the reservoir cannot flow to the accumulator module and the damper 200. In this case, the stiffness and / or damping of the damper 200 can be adjusted by the accumulator module. When the first control valve 3 is opened, the oil in the reservoir flows to the accumulator module to store energy, or the height of the vehicle body can be adjusted by the reservoir. This allows the mode of the hydraulic active suspension 1000 to be adjusted as needed.

[0036] As shown in Figure 1, in some embodiments of the present invention, the module connection point includes a first connection point, the accumulator module includes a first accumulator 9 and a second control valve 8, the first accumulator 9 communicates with the first connection point, and the second control valve 8 is provided between the first connection point and the lower chamber 2012, and the second control valve 8 is one of a regulating valve, a shut-off valve, and a shut-off regulating valve. When the second control valve 8 is a regulating valve, it adjusts the damping of the damper 200 by adjusting its opening degree. When the second control valve 8 is a shut-off valve, it adjusts its rigidity. When the second control valve 8 is a shut-off regulating valve, it adjusts the rigidity and damping of the damper 200.

[0037] Specifically, the first accumulator 9 can store energy, and when the second control valve 8 is an open shut-off regulating valve, or when the second control valve 8 is a regulating valve, if the opening of the second control valve 8 decreases and the amount of oil that can flow through the common passage decreases, the flow path from the damper to the common passage becomes smaller and the damping increases. When the opening of the second control valve 8 increases, the flow path from the damper to the common passage becomes larger and the damping decreases. Therefore, the cooperation between the first accumulator 9 and the second control valve 8 ensures the reliability of the damping adjustment of the hydraulic active suspension 1000 and ensures that the amount of oil flowing through the common passage matches the required damping. In other words, the second control valve 8 can adjust the flow rate of oil in the corresponding common passage, thereby adjusting the damping of the corresponding common passage and achieving the objective of adjusting the damping of the hydraulic active suspension 1000. This allows the damping of the hydraulic active suspension 1000 to be adjusted according to actual conditions, such as road conditions, ensuring that the damping of the hydraulic active suspension 1000 can meet vibration damping requirements and effectively resolving the conflict between vehicle comfort and handling stability.

[0038] If the second control valve 8 is a shut-off valve or a shut-off adjustment valve and the second control valve 8 is in the closed state, the connection between the damper 200 and the first accumulator 9 is interrupted, preventing the oil in the damper 200 from being discharged to the first accumulator 9, and preventing the oil in the first accumulator 9 from being discharged into the damper 200. This improves the rigidity of the damper 200.

[0039] In some embodiments of the present invention, as shown in Figure 1, the module connection point further includes a second connection point, and the accumulator module includes a second accumulator 10 and a third control valve 11, the second accumulator 10 is in communication with the second connection point, and the third control valve 11 is provided between the second accumulator 10 and the second connection point, and can selectively connect the second connection point and the second accumulator 10. Specifically, when the third control valve 11 is open, the oil in the second accumulator 10 can be discharged into the lower chamber 2012 of the damper 200. When the third control valve 11 is closed, the connection between the second accumulator 10 and the damper 200 is interrupted, so that the oil in the damper 200 cannot be discharged into the second accumulator 10, and the oil in the second accumulator 10 cannot be discharged into the damper 200, thereby improving the rigidity of the damper 200.

[0040] As shown in Figure 1, in some embodiments of the present invention, the module connection points include a first connection point and a second connection point, the accumulator module includes a first accumulator 9, a second accumulator 10, a second control valve 8 and a third control valve 11, the first accumulator 9 is connected to the first connection point, the second accumulator 10 is connected to the second connection point, the second control valve 8 is connected between the first connection point and the lower chamber 2012, the third control valve 11 is provided between the second accumulator 10 and the second connection point, the second control valve 8 is an adjustment valve for adjusting the damping of the damper 200, and the third control valve 11 is a shut-off valve for adjusting the stiffness of the damper 200.

[0041] Specifically, when the opening of the second control valve 8 decreases, reducing the amount of oil that can flow through the common passage, the flow path from the damper to the common passage becomes smaller, and the damping increases. When the opening of the second control valve 8 increases, the flow path from the damper to the common passage becomes larger, and the damping decreases. Therefore, the cooperation between the first accumulator 9 and the second control valve 8 ensures the reliability of the damping adjustment of the hydraulic active suspension 1000 and ensures that the amount of oil flowing through the common passage matches the required damping. In other words, since the flow rate of oil in the corresponding common passage can be adjusted by the second control valve 8, the damping of the corresponding common passage can be adjusted, achieving the objective of adjusting the damping of the hydraulic active suspension 1000. This allows the damping of the hydraulic active suspension 1000 to be adjusted according to actual conditions, for example, according to road conditions, ensuring that the damping of the hydraulic active suspension 1000 can meet vibration damping requirements and effectively resolving the conflict between vehicle comfort and handling stability.

[0042] When the third control valve 11 is open, the oil in the second accumulator 10 can be discharged into the lower chamber 2012 of the damper 200. When the third control valve 11 is closed, the connection between the second accumulator 10 and the damper 200 is interrupted, preventing the oil in the damper 200 from being discharged into the second accumulator 10, and preventing the oil in the second accumulator 10 from being discharged into the damper 200, thereby improving the rigidity of the damper 200.

[0043] Preferably, the first connection point is located on the side away from the second end of the second connection point.

[0044] In some embodiments of the present invention, a fourth control valve 12 is provided between the first connection point and the second connection point. By opening and closing the fourth control valve 12, the number of accumulators communicating with the damper 200 can be controlled, thereby adjusting the rigidity or damping of the damper 200.

[0045] In some embodiments of the present invention, as shown in Figure 1, the damper 200 is a front axle damper 200, with a third connection point provided between the module connection point and the first end, and the hydraulic active suspension 1000 further includes a third accumulator 30 communicating with the third connection point. As can be understood, when the vehicle is in motion and is subjected to shaking, shocks, etc., the oil in the lower chamber 2012 of each damper 200 enters the third accumulator 30 through a common passage to store energy and achieve the objective of rapidly reducing pressure. Also as can be understood, when encountering a relatively large obstacle, the front axle wheels will, in principle, encounter the obstacle first, so by providing the third accumulator 30 connected to the front axle damper 200 between the module connection point and the first end, the objective of high-speed response can be achieved.

[0046] In some embodiments of the present application, as shown in Figure 1, the damper 200 is a rear axle damper 200, the module connection point further includes a third connection point located between the first and second connection points, and the accumulator module includes a third accumulator 30 communicating with the third connection point. Specifically, the third accumulator 30 of the rear axle is connected to the first accumulator 9 and the second accumulator 10. between It is designed to dampen and release pressure as oil flows out of the lower chamber 2012, thus contributing to improved comfort.

[0047] In some embodiments of the present invention, the reservoir includes a tank 1, a control pump 26, a check valve 28, and an oil return valve 27, wherein the oil outlet of the tank 1 is connected to a common passage via an oil discharge passage, and the control pump 26 and the check valve 28 are connected in series to the oil discharge passage to open or close the oil discharge passage. The oil inlet of the tank 1 is connected to a common passage via an oil return passage, and the oil return valve 27 is connected in series to the oil return passage to open or close the oil return passage. Specifically, the tank 1 has separate oil return and oil discharge passages, and when oil needs to be discharged, the control pump 26 is opened and the oil return valve 27 is closed, and the control pump 26 guides the oil to the common passage. When oil needs to be returned, the control pump 26 is closed and the oil return valve 27 is opened, allowing oil from the common passage to flow through the oil return valve 27 into the tank 1. When returning oil, the presence of the check valve 28 effectively prevents oil from flowing to the control pump 26, and also prevents oil from flowing through the control pump 26 to the oil outlet in the event of a malfunction of the control pump 26. This ensures the reliable progress of oil discharge and oil return.

[0048] In some examples of this invention, as shown in Figure 1, the control pump 26 includes a control valve body 260 and a drive motor 261, the drive motor 261 being electrically connected to a valve in the control valve body 260, and rotating to control the rotation of the valve and thereby opening and closing the control pump 26. As a result, the control pump 26 is opened and closed by the cooperation of the drive motor 261 and the valve, ensuring reliable operation of the control pump 26 and reducing the influence of oil on the opening and closing of the control pump 26.

[0049] In some embodiments of the present invention, as shown in Figure 1, the hydraulic active suspension 1000 further includes a relief valve 31 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 opens to release the pressure, thereby protecting the hydraulic active suspension 1000 from remaining within a normal pressure range. The operating principle of the relief valve 31 is prior art and will not be described in detail here.

[0050] In some embodiments of the present invention, as shown in Figure 1, the hydraulic active suspension 1000 further includes a pressure-holding accumulator 29, which is provided at the outlet end of the control pump 26, thereby holding the pressure and eliminating flow rate fluctuations at the outlet end of the control pump 26.

[0051] In some embodiments of the present invention, as shown in Figures 1 and 2, the piston rod 203 is a hollow piston rod, and an oil passage 204 is provided inside the piston rod 203, the oil passage 204 is in communication with the lower chamber 2012, and the common passage is connected to the oil passage 204.

[0052] To make it easier to understand, during vehicle operation, the axle experiences vibrations such as shaking relative to the vehicle body. When installing the hydraulic active suspension 1000 according to the embodiment of this application on a vehicle, the housing 201 is attached to the axle and the piston rod 203 is connected to the vehicle body. As a result, the tip of the piston rod 203 and the vehicle body remain relatively stationary, and the housing 201 can move with the axle relative to the piston rod 203. By connecting the oil passage 204 of the piston rod 203 to a common passage, the influence of axle vibrations on the connection point of the common passage is reduced, the connection of the common passage is stabilized, wear at the connection point between the common passage and the reservoir is reduced, and wear at the connection point between the common passage and the piston rod 203 is reduced.

[0053] The following describes a specific example of a hydraulic active suspension according to the present invention, with reference to Figure 1. Note that the above example is merely illustrative and not a limiting description; it can be modified illustratively according to actual circumstances.

[0054] As shown in Figure 1, the hydraulic active suspension 1000 according to the embodiment of the present invention 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 accumulator module, a tank 1, a control pump 26, an oil return valve 27, a check valve 28, a pressure-holding accumulator 29, a relief valve 31, and a second control valve 8. The accumulator module includes a first accumulator 9, a second accumulator 10, and a third accumulator 30.

[0055] The left front damper assembly 2 and the right front damper assembly 2 both include a damper 200 and a vibration damping spring 205, with the vibration damping spring 205 being externally fitted and fixed to 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, with the vibration damping spring 205 being provided in parallel with the damper 200, and both ends of the vibration damping spring 205 of the left rear damper assembly 2 being connected to the vehicle body and axle, respectively. Both ends of the vibration damping spring 205 of the right rear damper assembly 2 being connected to the vehicle body and axle, respectively. Each damper 200 includes a housing 201, a piston rod 203, and a piston 202, the piston rod 203 being connected to the piston 202, the piston 202 being movably mounted within the housing 201 defining an upper chamber 2011 and a lower chamber 2012, an oil passage 204 being provided within the piston rod 203, the oil passage 204 communicating with the lower chamber 2012, the oil passage 204 of each damper assembly 2 being connected to a reservoir via a common passage, and a first control valve 3 being provided in each common passage.

[0056] Tank 1 has an oil outlet and an oil inlet, and the control pump 26 is connected to the oil outlet and a common passage, respectively, to guide the oil in Tank 1 into the common passage. An oil return valve 27 is connected to the oil inlet and the common passage, respectively, and when the oil return valve 27 is opened, oil flows from the common passage to the oil inlet. A check valve 28 is provided at the outlet end of the control pump 26 and opens in one direction. A pressure-holding accumulator 29 is provided at the outlet end of the control pump 26, located between the check valve 28 and the control pump 26, and can maintain pressure and eliminate flow rate fluctuations at the outlet end of the control pump 26.

[0057] Each damper assembly 2 corresponds to a first control valve 3 which is connected in series to the corresponding common passage and controls the opening or closing of the common passage.

[0058] Each damper assembly 2 corresponds to a second accumulator 10 which is connected to a common passage, and a third control valve 11 is provided at the oil inlet and outlet of the second accumulator 10, and the third control valve 11 is normally closed.

[0059] Each common passage has a second control valve 8, a first accumulator 9 and 4 A control valve 12 is further provided, and the second control valve 8 adjusts the flow rate through the corresponding common passage to adjust the damping of the hydraulic active suspension 1000. The first accumulator 9 can store energy. 4 The control valve 12 is provided between the first accumulator 9 and the second accumulator 10.

[0060] One third accumulator 30 is provided for each damper assembly 2. The third accumulator 30 corresponding to the left front damper assembly 2 is located between the first accumulator 9 and the corresponding oil passage 204, and the third accumulator 30 corresponding to the right front damper assembly 2 is located between the first accumulator 9 and the corresponding oil passage 204. The third accumulator 30 corresponding to the left rear damper assembly 2 is located between the first accumulator 9 and the second accumulator 10, and the third accumulator 30 corresponding to the right rear damper assembly 2 is located between the first accumulator 9 and the second accumulator 10.

[0061] Specifically, the hydraulic active suspension 1000 has a pressure boosting mode, a lift mode and a height reduction mode, and in the pressure boosting mode, the first control valve 3 is opened, and 4 When the control valve 12 is closed, the third control valve 11 is opened, and the control pump 26 is activated, the oil in tank 1 flows through four common passages into the corresponding second accumulators 10, where it stores energy. After each second accumulator 10 has stored energy, the third control valve 11 is closed.

[0062] In lift mode, the oil in tank 1 or the oil in the accumulator module can enter 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. The hydraulic oil that enters each oil passage 204 flows into the lower chamber 2012, thereby increasing the hydraulic pressure in the lower chamber 2012 and moving the piston 202 upward. The upward movement of the piston 202 moves the piston rod 203 upward. As 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, the vehicle body is moved upward, achieving the objective of lifting the vehicle body.

[0063] In height reduction mode, the control pump 26 stops operating, and due to the force of gravity of the vehicle, oil can flow out from 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. The oil pressure in the lower chamber 2012 of each damper 200 decreases, causing the piston 202 to move downward, and the movement of the piston 202 causes the piston rod 203 to move downward. As 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, the vehicle body moves downward, achieving the objective of reducing the height of the vehicle body. To make it clear, in height reduction mode, the oil discharged from each set of damper assemblies 2 may be discharged directly into tank 1, flow into the accumulator assembly to store energy, or discharged into both tank 1 and the accumulator assembly.

[0064] If the pressure inside the hydraulic active suspension 1000 is high, for example, if the pressure at the outlet of the control pump 26 is detected to have reached a certain threshold (30 MPa), the oil return valve 27 is opened to release the pressure and protect the hydraulic active suspension 1000 from remaining within the normal pressure range. At this time, the oil in each damper 200 can flow into the tank 1 through the common passage and the oil return valve 27.

[0065] If, after releasing the pressure, the pressure inside the hydraulic active suspension 1000 is still high or high during operation, the relief valve 31 can be opened to release the pressure and ensure the reliable operation of the entire hydraulic active suspension 1000.

[0066] While the vehicle is in motion, the damping of the hydraulic active suspension 1000 small In cases where the vehicle body shakes and affects comfort, the damping of the hydraulic active suspension 1000 can be adjusted by adjusting the amount of oil in each common passage using the second control valve 8. When the opening of the second control valve 8 decreases, reducing the amount of oil that can flow through the common passage, the amount of oil entering the common passage from the damper decreases, increasing the damping. When the opening of the second control valve 8 increases, the amount of oil entering the common passage from the damper increases, decreasing the damping, thereby ensuring that the damping of the hydraulic active suspension 1000 is properly adjusted.

[0067] If the rigidity of the hydraulic active suspension 1000 is high and reduces the comfort of the vehicle, the third control valve 11 can be controlled to open, and the oil in the second accumulator 10 can be replenished into each common passage, thereby reducing the rigidity of the hydraulic active suspension 1000 and improving the damping effect of the hydraulic active suspension 1000 against vibrations.

[0068] When the vehicle is in motion and experiences shaking or impacts, the oil in the lower chamber 2012 of each damper assembly 2 enters the third accumulator 30 through the oil passage 204 to store energy and achieve the objective of rapidly reducing pressure. Since the front axle of the vehicle needs to ensure driving stability and the rear axle of the vehicle mainly needs to ensure comfort, the third accumulator 30 corresponding to the left front damper assembly 2 is located between the first accumulator 9 and the corresponding oil passage 204, and the third accumulator 30 corresponding to the right front damper assembly 2 is located between the first accumulator 9 and the corresponding oil passage 204, enabling rapid release of pressure.

[0069] The vehicle according to the embodiment of the present application includes the hydraulic active suspension 1000 described in any of the above embodiments of the present application.

[0070] In the embodiment of the present invention, by providing the hydraulic active suspension 1000 of any of the above embodiments, the height of the vehicle body can be adjusted, improving the vehicle's handling stability without compromising the vehicle's comfort, effectively resolving the conflict between vehicle comfort and handling stability, further adjusting the rigidity and damping, and making the vehicle equipped with the hydraulic active suspension 1000 run more smoothly. In addition, since the flow path between the reservoir and the lower chamber 2012 and the flow path between the accumulator module and the lower chamber 2012 overlap, the number of connecting pipes can be reduced, making the overall structure of the hydraulic active suspension 1000 more compact and facilitating its installation in the overall space of the vehicle.

[0071] Furthermore, in the description of this application, the directions or positional relationships indicated by terms such as "center," "vertical direction," "horizontal direction," "length," "width," "thickness," "top," "bottom," "front," "back," "left," "right," "perpendicular," "horizontal," "top," "bottom," "inside," "outside," "clockwise," "counterclockwise," "axial direction," "radial direction," and "circumferential direction" are based on the directions or positional relationships shown in the drawings and are merely for the purpose of easily explaining and simplifying the description of this application. They do not indicate or suggest that the shown device or component has a specific direction or must be configured and operate in a specific direction, and therefore should not be understood as limiting this application.

[0072] Furthermore, the terms "first" and "second" are merely descriptive and should not be understood as indicating or suggesting relative importance, or implicitly indicating the number of technical features shown. Thus, features limited by "first" and "second" may explicitly or implicitly include one or more such features. In this description, "multiple" means two or more unless otherwise clearly and specifically limited.

[0073] In this application, unless otherwise explicitly provided and limited, terms such as "attachment," "connection," "bonding," and "fixing" should be understood in a broad sense. For example, these may include fixed connections, detachable connections, integral connections, mechanical connections, electrical connections, direct connections, indirect connections via an intermediate medium, internal communication between two parts, or the interaction between two parts. A person skilled in the art will be able to understand the specific meaning of these terms in this application depending on the specific circumstances.

[0074] In this application, unless otherwise explicitly stated or limited, the presence of a first feature "above" or "below" a second feature may include direct contact between the first and second features, or indirect contact between them via an intermediate medium. Furthermore, the presence of a first feature "above," "above," or "on the top surface" of a second feature may include the first feature being directly above or diagonally above the second feature, or it may simply indicate that the horizontal height of the first feature is greater than that of the second feature. The presence of a first feature "below," "below," or "on the bottom surface" of a second feature may include the first feature being directly below or diagonally below the second feature, or it may simply indicate that the horizontal height of the first feature is lower than that of the second feature.

[0075] In this specification, any reference to terms such as “one embodiment,” “several embodiments,” “example,” “specific example,” or “several examples” means that the specific features, structures, materials, or properties described in combination with such embodiment or example are included in at least one embodiment or example of this application. In this specification, the exemplary expressions of the above terms are not necessarily limited to the same embodiment or example. Furthermore, the specific features, structures, materials, or properties described can be appropriately combined in any one or more embodiments or examples. Also, a person skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described herein, provided that they do not conflict with each other.

[0076] Although embodiments of the present application have been shown and described above, it should be understood that these embodiments are illustrative and should not be understood as limiting the present application. Those skilled in the art can modify, alter, replace, and change the embodiments within the scope of the present application. [Explanation of Symbols]

[0077] 1000 Hydraulic Active Suspension 1 tank 200 damper 201 Housing 2011 Upper Chamber 2012 Lower Chamber 202 Pistons 203 Piston Rod 204 Oil passage 3. First control valve 8. Second control valve 9. First accumulator 10. Second accumulator 11. Third control valve 12. Fourth control valve 26 Control pump 260 Control valve body 261 Drive motor 27 Oil return valve 28 Check valve 29. Pressure-holding accumulator 30 Third Accumulator 31 Relief valve

Claims

1. A hydraulic active suspension for use in a vehicle, comprising a damper, a common passage, an accumulator module, and a reservoir, wherein the damper has a housing, a piston, and a piston rod, the housing is configured to be connected to a wheel or axle, the piston is located within the housing and defines an upper chamber and a lower chamber of the damper, one end of the piston rod is connected to the piston, and the other end of the piston rod extends from the housing and is configured to be connected to the vehicle body, the reservoir and the accumulator module both communicate with the lower chamber via the common passage, the reservoir adjusts the height of the vehicle, and the accumulator module adjusts at least one of the stiffness and damping of the damper. The first end of the common passage is in communication with the lower chamber. The second end of the common passage is in communication with the reservoir, and a module connection point is provided in the common passage. The module connection point is located between the first end and the second end and connects the accumulator modules. The module connection point includes the first connection point, The accumulator module includes a first accumulator and a second control valve, The first accumulator is in communication with the first connection point, and the second control valve is provided between the first connection point and the lower chamber. The second control valve is one of a shut-off valve and a shut-off adjustment valve, If the second control valve is a shut-off valve, adjust its rigidity. If the second control valve is the shut-off adjustment valve, it adjusts the rigidity and damping of the damper. The aforementioned module connection point further includes a second connection point, The accumulator module includes a second accumulator and a third control valve. The second accumulator communicates with the second connection point, The third control valve is provided between the second accumulator and the second connection point, and can selectively communicate the second accumulator and the second connection point. A fourth control valve is provided between the first connection point and the second connection point. A hydraulic active suspension system characterized by the following features.

2. The hydraulic active suspension according to claim 1, characterized in that a first control valve is provided in the common passage between the second end and the module connection point.

3. The hydraulic active suspension according to claim 1, characterized in that the first connection point is provided on the side of the second connection point that is away from the second end.

4. The hydraulic active suspension according to claim 1, wherein the damper is a front axle damper, a third connection point is provided between the module connection point and the first end, and the hydraulic active suspension further includes a third accumulator communicating with the third connection point.

5. The hydraulic active suspension according to claim 1, wherein the damper is a rear axle damper, the module connection point further includes a third connection point located between the first connection point and the second connection point, and the accumulator module includes a third accumulator communicating with the third connection point.

6. A vehicle characterized by including a hydraulic active suspension as described in any one of claims 1 to 5.

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