Hydraulic suspension system

Abstract

A hydraulic suspension system (100), comprising: a hydraulic cylinder (101), a power module (102), and a first accumulator module (103). A piston (3) is movably arranged in the hydraulic cylinder (101), and the piston (3) partitions the interior of the hydraulic cylinder (101) into a first cavity (2) and a second cavity (4); the power module (102) is provided with a first interface (A) and a second interface (B), the first interface (A) is selectively communicated with the first cavity (2), and the second interface (B) is selectively communicated with the second cavity (4); the power module (102) is configured to drive a medium to flow from the first interface (A) toward the second interface (B) or to drive the medium to flow from the second interface (B) toward the first interface (A); and the first accumulator module (103) has a first accumulator cavity and a second accumulator cavity, the first accumulator cavity is selectively communicated with the first cavity (2), and the second accumulator cavity is selectively communicated with the second cavity (4).

Description

Hydraulic suspension system

[0001] This application claims priority to Chinese patent application No. 202410247046.7, filed on March 4, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present disclosure relates to the field of hydraulic technology, and in particular to a hydraulic suspension system. Background Art

[0003] Suspension is the general term for the device that transmits force between a vehicle's frame (or body) and axles (or wheels). By transferring the forces and moments acting between the wheels and frame, it cushions the impact of uneven road surfaces, reducing vibration and allowing the vehicle to travel smoothly. Hydraulic suspension, as a type of suspension, offers excellent stability, low maintenance costs, and easy raising and lowering capabilities.

[0004] Summary of the Invention

[0005] The present disclosure aims to address at least one of the technical problems existing in the related art. To this end, one objective of the present disclosure is to provide a hydraulic suspension system. The hydraulic suspension system designed according to the present disclosure has higher conversion efficiency and faster adjustment rate, resulting in higher operating efficiency and a wider range of active power adjustment.

[0006] According to the present disclosure, the hydraulic suspension system includes: a hydraulic cylinder, a power module and a first energy storage module. A piston is movably provided in the hydraulic cylinder, and the piston divides the interior of the hydraulic cylinder into a first cavity and a second cavity. The power module has a first interface and a second interface, and the first interface is selectively connected to the first cavity, and the second interface is selectively connected to the second cavity. The power module is configured to drive the medium to flow from the first interface toward the second interface or to drive the medium to flow from the second interface toward the first interface. The first energy storage module has a first energy storage chamber and a second energy storage chamber, and the first energy storage chamber is selectively connected to the first cavity, and the second energy storage chamber is selectively connected to the second cavity.

[0007] According to the hydraulic suspension system disclosed herein, a power module and a first energy storage module are provided that can selectively participate in oil circuit pressure regulation, and when the power module is working, the hydraulic suspension system is in an active power regulation mode. In the active power regulation mode, there is no other valve body or structure for diversion, which can effectively ensure that the hydraulic suspension system has sufficient energy, can achieve higher conversion efficiency and faster regulation rate, and improve the working efficiency of the hydraulic suspension system, so that the hydraulic suspension system can have a larger active power regulation range.

[0008] In some embodiments, the hydraulic suspension system further includes: at least one of a first valve body or a second valve body. The first valve body has a first valve port and a second valve port that are selectively connected to each other, the first valve port communicating with the first interface, and the second valve port communicating with the first cavity and the first energy storage chamber, respectively. The second valve body has a third valve port and a fourth valve port that are selectively connected to each other, the third valve port communicating with the second interface, and the fourth valve port communicating with the second cavity and the second energy storage chamber, respectively.

[0009] In some embodiments, the first energy storage module includes: a first accumulator and a second accumulator. The first accumulator has a first energy storage chamber, which is connected to the second valve port. The second accumulator has a second energy storage chamber, which is connected to the fourth valve port. The hydraulic suspension system has a first active power regulation mode. When the hydraulic suspension system is in the first active power regulation mode, the first valve port is connected to the second valve port, and the third valve port is connected to the fourth valve port.

[0010] In some embodiments, the hydraulic suspension system further includes: a second energy storage module, a third valve body, and a fourth valve body. The second energy storage module has a third energy storage chamber. The third valve body has a fifth valve port and a sixth valve port that are selectively connected to each other. The fifth valve port communicates with the third energy storage chamber, and the sixth valve port communicates with the first chamber and the first energy storage chamber, respectively. The fourth valve body has a seventh valve port and an eighth valve port that are selectively connected to each other. The seventh valve port communicates with the third energy storage chamber, and the eighth valve port communicates with the second chamber and the second energy storage chamber, respectively.

[0011] In some embodiments, the seventh valve port and the eighth valve port are configured to be connected when the fifth valve port and the sixth valve port are connected, so that the third energy storage chamber is connected to the first cavity and the second cavity at the same time.

[0012] In some embodiments, the second energy storage module includes: a third accumulator, a first valve group, and a second valve group. The third accumulator has a third energy storage chamber. The first valve group is formed with a first energy storage interface and a third interface connected to the first energy storage interface. The first energy storage interface is connected to the fifth valve port, and the third interface is connected to the third energy storage chamber. The first valve group is configured to selectively direct the medium from the first energy storage interface to the third interface or from the third interface to the first energy storage interface. The second valve group is formed with a second energy storage interface and a fourth interface connected to the second energy storage interface. The second energy storage interface is connected to the seventh valve port, and the fourth interface is connected to the third energy storage chamber. The second valve group is configured to selectively direct the medium from the second energy storage interface to the fourth interface or from the fourth interface to the second energy storage interface. The hydraulic suspension system has a second active power adjustment mode. When the hydraulic suspension system is in the second active power adjustment mode, the first valve port is disconnected from the second valve port, the third valve port is disconnected from the fourth valve port, the fifth valve port is connected to the sixth valve port, and the seventh valve port is connected to the eighth valve port.

[0013] In some embodiments, the first valve assembly includes a first damping valve, a first one-way valve, and a second one-way valve. The first damping valve has a fifth port and the third port. The first one-way valve has a first inlet and a first outlet, the first inlet of the first one-way valve communicating with the first energy storage port, and the first outlet of the first one-way valve communicating with the fifth port. The second one-way valve has a second inlet and a second outlet, the second inlet of the second one-way valve communicating with the third port, and the second outlet of the second one-way valve communicating with the first energy storage port.

[0014] In some embodiments, the second valve assembly includes a second damping valve, a third one-way valve, and a fourth one-way valve. The second damping valve has a sixth port and the fourth port. The third one-way valve has a third inlet and a third outlet. The third inlet of the third one-way valve communicates with the second energy storage port, and the third outlet of the third one-way valve communicates with the sixth port. The fourth one-way valve has a fourth inlet and a fourth outlet. The fourth inlet of the fourth one-way valve communicates with the fourth port, and the fourth outlet of the fourth one-way valve communicates with the second energy storage port.

[0015] In some embodiments, the power module includes a bidirectional hydraulic pump and a bidirectional drive motor. The bidirectional hydraulic pump has a first interface and a second interface, and is configured to selectively drive the medium from the first interface to the second interface or from the second interface to the first interface. The bidirectional drive motor has a drive end connected to the bidirectional hydraulic pump.

[0016] In some embodiments, the hydraulic suspension system further includes: at least one of a fifth valve body or a sixth valve body. The fifth valve body has a ninth valve port and a tenth valve port that are selectively connected to each other. The ninth valve port is connected to the first interface, and the tenth valve port is connected to the first cavity. The sixth valve body has an eleventh valve port and a twelfth valve port that are selectively connected to each other. The eleventh valve port is connected to the second interface, and the twelfth valve port is connected to the second cavity. The hydraulic suspension system has a passive adjustment mode. When the hydraulic suspension system is in the passive adjustment mode, the ninth valve port is disconnected from the tenth valve port, and the eleventh valve port is disconnected from the twelfth valve port.

[0017] To sum up, according to the hydraulic suspension system disclosed in the present invention, a power module and a first energy storage module are provided that can optionally participate in the oil circuit pressure regulation. In the main power regulation mode, there is no other valve body or structure for diversion, which can effectively ensure that the hydraulic suspension system has sufficient energy, so that the hydraulic suspension system has higher conversion efficiency and faster regulation rate, the hydraulic suspension system has higher working efficiency and a larger main power regulation range.

[0018] Additional aspects and advantages of the present disclosure will be given in part in the description that follows and, in part, will be obvious from the description that follows, or will be learned through practice of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present disclosure will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] FIG. 1 is an exemplary diagram of a hydraulic suspension system in a passive adjustment mode according to some embodiments of the present disclosure.

[0021] FIG. 2 is an exemplary diagram of a second active force adjustment mode of a hydraulic suspension system according to some embodiments of the present disclosure.

[0022] FIG3 is an exemplary diagram of a first active force adjustment mode of a hydraulic suspension system according to some embodiments of the present disclosure.

[0023] Reference numerals:

[0024] 100. Hydraulic suspension system; 101. Hydraulic cylinder; 102. Power module; 103. First energy storage module; 104. Second energy storage module;

[0025] 1. Piston rod; 2. First cavity; 3. Piston; 4. Second cavity;

[0026] 7. Bidirectional hydraulic pump; A, first interface; B, second interface; 8. Bidirectional drive motor;

[0027] 5, fifth valve body; K, ninth valve port; L, tenth valve port;

[0028] 6, sixth valve body; M, eleventh valve port; N, twelfth valve port;

[0029] 11. First accumulator; 12. Second accumulator;

[0030] 9. First valve body; C. First valve port; D. Second valve port;

[0031] 10, second valve body; E, third valve port; F, fourth valve port;

[0032] 20, third accumulator; 22, first valve group; O, first energy storage interface; P, third interface; 23, second valve group; Q, second energy storage interface; R, fourth interface;

[0033] 19. First damping valve; 16. First one-way valve; 15. Second one-way valve;

[0034] 21. Second damping valve; 18. Third one-way valve; 17. Fourth one-way valve;

[0035] 13, third valve body; G, fifth valve port; H, sixth valve port;

[0036] 14, fourth valve body; I, seventh valve port; J, eighth valve port. DETAILED DESCRIPTION

[0037] Some embodiments of the present disclosure are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present disclosure and are not to be construed as limiting the present disclosure.

[0038] In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present disclosure.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the present disclosure, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0040] In this disclosure, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections, electrical connections, or communication; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this disclosure based on specific circumstances.

[0041] In the present disclosure, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0042] In the related art, a vehicle is equipped with a hydraulic suspension system to provide power to the vehicle, thereby reducing vibrations caused by uneven road surfaces. To ensure the effectiveness of the hydraulic suspension system in providing power, in some hydraulic suspension systems, the main force adjustment module and the damping adjustment module are usually connected in parallel to form two independent closed circuits, and at least one accumulator is connected in the middle of the damping valve to receive the damping medium discharged by the piston rod. However, in this system, regardless of lifting or pressing, some high-pressure oil leaks through the damping valve, losing some energy, and the system has low working efficiency. At the same time, due to the diversion of the damping valve, the flow rate supplied by the hydraulic pump to the working cylinder body becomes less, affecting the adjustment speed of the hydraulic suspension system. In addition, in order to prevent the damping force of the damping valve from being too large, the system is equipped with an overflow valve on the piston, resulting in the system being able to provide a limited main force and unable to achieve large main force adjustment.

[0043] A hydraulic suspension system 100 according to some embodiments of the present disclosure will be described below with reference to FIG. 1 to FIG. 3 .

[0044] As shown in FIG. 1 to FIG. 3 , a hydraulic suspension system 100 according to some embodiments of the present disclosure includes: a hydraulic cylinder 101 , a power module 102 , and a first energy storage module 103 .

[0045] A piston 3 is movably provided in the hydraulic cylinder 101 , and the piston 3 divides the interior of the hydraulic cylinder 101 into a first cavity 2 and a second cavity 4 .

[0046] The power module 102 has a first interface A and a second interface B. The first interface A is selectively connected to the first cavity 2, and the second interface B is selectively connected to the second cavity 4. The power module 102 is configured to drive the medium to flow between the first interface A and the second interface B. For example, the power module 102 is configured to drive the medium to flow from the first interface A toward the second interface B, or the power module 102 is configured to drive the medium to flow from the second interface B toward the first interface A.

[0047] The first energy storage module 103 has a first energy storage chamber and a second energy storage chamber. The first energy storage chamber can be selectively communicated with the first cavity 2 , and the second energy storage chamber can be selectively communicated with the second cavity 4 .

[0048] The hydraulic cylinder 101 is divided by the piston 3 into a first chamber 2 and a second chamber 4. The piston 3 is connected to a piston rod 1. One end of the piston rod 1 is connected to the piston 3, while the other end of the piston rod 1 extends from the first chamber 2 to the outside of the hydraulic cylinder 101 and connects to the sprung mass. The bottom of the hydraulic cylinder 101 is connected to the unsprung mass. Because the piston rod 1 occupies space in the first chamber 2, the change in the medium in the first chamber 2 is smaller than the change in the medium in the second chamber 4 when the piston 3 moves. In the oil circuit of the hydraulic suspension system 100, the power module 102 and the first energy storage module 103 can optionally participate in pressure regulation in the oil circuit.

[0049] Here, sprung mass is defined as the mass supported by the elastic elements of the suspension system, such as the vehicle body, frame, powertrain, and passengers. Unsprung mass is defined as the mass not supported by the elastic elements of the suspension system, such as tires, wheels, and brakes.

[0050] For example, when the power module 102 is working, the first interface A is connected to the first cavity 2 , and the second interface B is connected to the second cavity 4 .

[0051] Under the action of the power module 102, the medium can flow from the first cavity 2 through the power module 102 and into the second cavity 4. At this time, the piston 3 moves upward, and the amount of medium flowing out of the first cavity 2 is A1, and the amount of medium required by the second cavity 4 is B1, and A1<B1. That is, the amount of medium flowing out of the first cavity 2 is not enough to meet the amount of medium required by the second cavity 4. Therefore, at least one of the first energy storage chamber or the second energy storage chamber of the first energy storage module 103 can be made to replenish the medium into the flow path, and the medium replenishment amount is C1, C1=B1-A1. At this time, at least one of the first energy storage chamber or the second energy storage chamber is used to replenish the medium into the hydraulic suspension system 100 to reduce the pressure pulsation of the hydraulic suspension system 100 until the pressure balance of the hydraulic suspension system 100 is achieved.

[0052] It should be noted that “at least one of A, B and C” has the same meaning as “at least one of A, B or C”, both including the following combinations of A, B and C: A only, B only, C only, the combination of A and B, the combination of A and C, the combination of B and C, and the combination of A, B and C.

[0053] Under the action of the power module 102, the medium can also flow from the second cavity 4 through the power module 102 and into the first cavity 2. At this time, the piston 3 moves downward, and the amount of medium flowing out of the second cavity 4 is B1, and the amount of medium required by the first cavity 2 is A1, B1>A1. That is, the amount of medium flowing out of the second cavity 4 is more than the amount required by the first cavity 2. Therefore, the excess medium that cannot enter the first cavity 2 can be stored in at least one of the first energy storage chamber or the second energy storage chamber, and the amount of excess medium is C1, C1+A1=B1. At this time, at least one of the first energy storage chamber or the second energy storage chamber is used to store excess medium in the hydraulic suspension system 100 to reduce the pressure pulsation of the hydraulic suspension system 100 until the pressure balance of the hydraulic suspension system 100 is reached, thereby realizing the power regulation of the hydraulic suspension system 100.

[0054] It should be noted that when the power module 102 drives the medium to flow from the first cavity 2 through the power module 102 and into the second cavity 4 to move the piston 3 upward, the hydraulic suspension system 100 executes the instruction for the wheel to move downward or the body to move upward; when the power module 102 drives the medium to flow from the second cavity 4 through the power module 102 and into the first cavity 2 to move the piston 3 downward, the hydraulic suspension system 100 executes the instruction for the wheel to move upward or the body to move downward.

[0055] According to some embodiments of the present disclosure, the hydraulic suspension system 100 is provided with a power module 102 and a first energy storage module 103 that can selectively participate in oil circuit pressure regulation. Furthermore, when the power module 102 is operating, the hydraulic suspension system 100 is in active power regulation mode. In this active power regulation mode, no other valve body or structure is used for flow diversion. This effectively ensures that the hydraulic suspension system 100 has sufficient energy, enabling higher conversion efficiency and faster regulation rate, improving the operating efficiency of the hydraulic suspension system 100, and thus enabling the hydraulic suspension system 100 to have a wider active power regulation range.

[0056] In some embodiments, as shown in Figures 1-3, the hydraulic suspension system 100 further includes at least one of a first valve body 9 or a second valve body 10. The first valve body 9 has a first valve port C and a second valve port D that are selectively connected to each other. The first valve port C is connected to the first interface A, and the second valve port D is connected to the first chamber 2 and the first energy storage chamber, respectively. The second valve body 10 has a third valve port E and a fourth valve port F that are selectively connected to each other. The third valve port E is connected to the second interface B, and the fourth valve port F is connected to the second chamber 4 and the second energy storage chamber, respectively. For example, the first valve body 9 can selectively connect the first energy storage chamber to the first chamber 2, and the second valve body 10 can selectively connect the second energy storage chamber to the second chamber 4.

[0057] Under the action of the power module 102, when the medium flows from the first cavity 2 through the power module 102 and enters the second cavity 4 to make the piston 3 move upward, the first valve body 9 can connect the first energy storage chamber with the first cavity 2, or the second valve body 10 can connect the second energy storage chamber with the second cavity 4, so that at least one of the first energy storage chamber or the second energy storage chamber replenishes the medium into the flow path to reduce the pressure pulsation of the hydraulic suspension system 100 until the pressure balance of the hydraulic suspension system 100 is achieved.

[0058] Alternatively, under the action of the power module 102, when the medium flows from the second chamber 4 through the power module 102 and enters the first chamber 2, causing the piston 3 to move downward, the first valve body 9 can be caused to connect the first energy storage chamber with the first chamber 2, or the second valve body 10 can be caused to connect the second energy storage chamber with the second chamber 4, so that at least one of the first energy storage chamber or the second energy storage chamber can store excess medium in the hydraulic suspension system 100, thereby reducing pressure pulsation in the hydraulic suspension system 100 until pressure balance is achieved in the hydraulic suspension system 100, thereby achieving power regulation of the hydraulic suspension system 100. For example, when the power module 102 is operating, the first valve body 9 connects the first energy storage chamber with the first chamber 2, and the second valve body 10 connects the second energy storage chamber with the second chamber 4, so that the hydraulic suspension system 100 can timely regulate the oil circuit pressure.

[0059] In some embodiments, the first energy storage chamber and the second energy storage chamber may be configured as two chambers separated from each other in the same accumulator, and the medium is stored in both the first energy storage chamber and the second energy storage chamber.

[0060] In some embodiments, as shown in Figures 1-3, the first energy storage module 103 includes a first accumulator 11 and a second accumulator 12, wherein the first energy storage chamber and the second energy storage chamber are respectively configured as chambers of the two accumulators. For example, the first accumulator 11 has a first energy storage chamber connected to the second valve port D; the second accumulator 12 has a second energy storage chamber connected to the fourth valve port F.

[0061] As shown in FIG3 , the hydraulic suspension system 100 has a first active power regulation mode (e.g., a high active power regulation mode). When the hydraulic suspension system 100 is in the first active power regulation mode, the first valve port C is connected to the second valve port D, and the third valve port E is connected to the fourth valve port F. For example, the operation of the power module 102 can place the hydraulic suspension system 100 in the active power regulation mode. When the hydraulic suspension system 100 is in the first active power regulation mode, the first valve body 9 connects the first energy storage chamber to the first cavity 2, and the second valve body 10 connects the second energy storage chamber to the second cavity 4. The first accumulator 11 and the second accumulator 12 store and replenish the medium in the oil circuit, reducing the pressure pulsation of the hydraulic suspension system 100 until the pressure balance of the hydraulic suspension system 100 is achieved, thereby achieving high active power regulation.

[0062] In some embodiments, as shown in Figures 1-3, the hydraulic suspension system 100 further includes a second energy storage module 104, a third valve body 13, and a fourth valve body 14. The second energy storage module 104 has a third energy storage chamber; the third valve body 13 has a fifth valve port G and a sixth valve port H, which are selectively connected to each other. The fifth valve port G communicates with the third energy storage chamber, and the sixth valve port H communicates with the first chamber 2 and the first energy storage chamber, respectively. The fourth valve body 14 has a seventh valve port I and an eighth valve port J, which are selectively connected to each other. The seventh valve port I communicates with the third energy storage chamber, and the eighth valve port J communicates with the second chamber 4 and the second energy storage chamber, respectively. In the oil circuit of the hydraulic suspension system 100, the second energy storage module 104 can selectively participate in pressure regulation in the oil circuit through the third valve body 13 and the fourth valve body 14. In this case, the third energy storage chamber can be used to store and replenish the medium in the oil circuit, thereby regulating the pressure of the hydraulic suspension system 100.

[0063] In some embodiments, as shown in Figures 1-3, when the fifth valve port G is connected to the sixth valve port H, the seventh valve port I is connected to the eighth valve port J, thereby connecting the second energy storage module 104 to the oil circuit, thereby simultaneously connecting the third energy storage chamber to the first chamber 2 and the second chamber 4. The third valve body 13 and the fourth valve body 14 connect the second energy storage module 104 to the oil circuit when the hydraulic suspension system 100 requires the third energy storage chamber. Furthermore, the third valve body 13 and the fourth valve body 14 can also disconnect the second energy storage module 104 from the oil circuit when the hydraulic suspension system 100 does not require the third energy storage chamber. This prevents the medium in the oil circuit from being diverted to the second energy storage module 104 in the first active power regulation mode, thereby ensuring the overall vehicle power regulation efficiency.

[0064] 1-3 , the second energy storage module 104 includes a third accumulator 20, a first valve group 22, and a second valve group 23. The third accumulator 20 has a third energy storage chamber.

[0065] The first valve group 22 is formed with a first energy storage port O and a third port P communicating with the first energy storage port O. The first energy storage port O is in communication with the fifth valve port G, and the third port P is in communication with the third energy storage chamber. The first valve group 22 can selectively direct the flow of medium between the first energy storage port O and the third port P. For example, the first valve group 22 can selectively direct the flow of medium from the first energy storage port O to the third port P; or, the first valve group 22 can selectively direct the flow of medium from the third port P to the first energy storage port O.

[0066] The second valve group 23 is formed with a second energy storage port Q and a fourth port R communicating with the second energy storage port Q. The second energy storage port Q is in communication with the seventh valve port I, and the fourth port R is in communication with the third energy storage chamber. The second valve group 23 can selectively direct the flow of medium between the second energy storage port Q and the fourth port R. For example, the second valve group 23 can selectively direct the flow of medium from the second energy storage port Q to the fourth port R; or, the second valve group 23 can selectively direct the flow of medium from the fourth port R to the second energy storage port Q.

[0067] As shown in FIG2 , the hydraulic suspension system 100 has a second active power regulation mode (e.g., a low active power regulation mode). When the hydraulic suspension system 100 is in the second active power regulation mode, the first valve port C is disconnected from the second valve port D, the third valve port E is disconnected from the fourth valve port F, the fifth valve port G is connected to the sixth valve port H, and the seventh valve port I is connected to the eighth valve port J. In the second active power regulation mode, the first valve body 9 and the second valve body 10 are disconnected, removing the first accumulator 11 and the second accumulator 12 from the oil circuit. The third valve body 13 and the fourth valve body 14 are connected, connecting the third accumulator 20 to the oil circuit.

[0068] In some embodiments, as shown in Figures 1-3, the first valve assembly 22 includes a first damping valve 19, a first one-way valve 16, and a second one-way valve 15. The first damping valve 19 has a fifth port and a third port P. The first one-way valve 16 has a first inlet and a first outlet. The first inlet of the first one-way valve 16 communicates with the first energy storage port O, and the first outlet of the first one-way valve 16 communicates with the fifth port. The second one-way valve 15 has a second inlet and a second outlet. The second inlet of the second one-way valve 15 communicates with the third port P, and the second outlet of the second one-way valve 15 communicates with the first energy storage port O.

[0069] For example, when the hydraulic suspension system 100 is in the second active force adjustment mode, when it is necessary to execute the upward movement of the wheel or the downward movement of the vehicle body, the power module 102 drives the medium to flow through the second cavity 4 through the power module 102 and into the first cavity 2 to move the piston 3 downward, and the excess medium flows through the fourth valve body 14, the second valve group 23, and enters the third accumulator 20 until the pressure of the hydraulic suspension system 100 is balanced, thereby realizing the coordinated control of low active force and damping adjustment.

[0070] When the hydraulic suspension system 100 is in the second active force adjustment mode and the wheels need to move downward or the vehicle body needs to move upward, the power module 102 drives the medium from the first chamber 2 through the power module 102 and into the second chamber 4, causing the piston 3 to move upward. Excess medium flows through the third valve body 13, the first one-way valve 16, and the first damping valve 19. Under the action of the liquid pressure in the third accumulator 20, it flows through the second valve group 23 to replenish the oil circuit until the pressure of the hydraulic suspension system 100 is balanced, thereby achieving coordinated control of low active force and damping adjustment. It should be noted that the third accumulator 20 replenishes the medium flowing into the second chamber 4.

[0071] In some embodiments, as shown in Figures 1-3, the second valve group 23 includes a second damping valve 21, a third one-way valve 18, and a fourth one-way valve 17. The second damping valve 21 has a sixth port and a fourth port R; the third one-way valve 18 has a third inlet and a third outlet, the third inlet of the third one-way valve 18 communicating with the second energy storage port Q, and the third outlet of the third one-way valve 18 communicating with the sixth port; the fourth one-way valve 17 has a fourth inlet and a fourth outlet, the fourth inlet of the fourth one-way valve 17 communicating with the fourth port R, and the fourth outlet of the fourth one-way valve 17 communicating with the second energy storage port Q.

[0072] For example, when the hydraulic suspension system 100 is in the second active force adjustment mode, when it is necessary to execute the upward movement of the wheel or the downward movement of the vehicle body, the power module 102 drives the medium to flow from the second cavity 4 through the power module 102 and into the first cavity 2 to move the piston 3 downward, and the excess medium flows through the fourth valve body 14, the third one-way valve 18, the second damping valve 21 and enters the third accumulator 20 until the pressure of the hydraulic suspension system 100 is balanced, thereby realizing the coordinated control of low active force and damping adjustment.

[0073] When the hydraulic suspension system 100 is in the second active force adjustment mode, when it is necessary to execute the downward movement of the wheel or the upward movement of the vehicle body, the power module 102 drives the medium to flow from the first cavity 2 through the power module 102 and into the second cavity 4 to move the piston 3 upward, and the excess medium flows through the third valve body 13, the first one-way valve 16, the first damping valve 19 and flows through the fourth one-way valve 17 to replenish the oil circuit under the action of the liquid pressure in the third accumulator 20 until the pressure of the hydraulic suspension system 100 is balanced, thereby realizing the coordinated control of low active force and damping adjustment.

[0074] In some embodiments, as shown in Figures 1 to 3, the power module 102 includes a bidirectional hydraulic pump 7 and a bidirectional drive motor 8. The bidirectional hydraulic pump 7 has a first interface A and a second interface B, and the bidirectional hydraulic pump 7 is configured to selectively drive the medium to flow between the first interface A and the second interface B. For example, the bidirectional hydraulic pump 7 is configured to selectively drive the medium to flow from the first interface A toward the second interface B; or, the bidirectional hydraulic pump 7 is configured to selectively drive the medium to flow from the second interface B toward the first interface A. The bidirectional drive motor 8 has a drive end, which is connected to the bidirectional hydraulic pump 7. For example, the bidirectional hydraulic pump 7 is electrically connected to the bidirectional drive motor 8. The bidirectional drive motor 8 drives the bidirectional hydraulic pump 7 to pump the medium in both directions, not only transporting the medium in the first cavity 2 to the second cavity 4, but also transporting the medium in the second cavity 4 to the first cavity 2.

[0075] In some embodiments, as shown in Figures 1-3, the hydraulic suspension system 100 further includes at least one of a fifth valve body 5 or a sixth valve body 6. The fifth valve body 5 has a ninth valve port K and a tenth valve port L, which are selectively connected to each other. The ninth valve port K communicates with the first port A, and the tenth valve port L communicates with the first chamber 2. The sixth valve body 6 has an eleventh valve port M and a twelfth valve port N, which are selectively connected to each other. The eleventh valve port M communicates with the second port B, and the twelfth valve port N communicates with the second chamber 4. The fifth valve body 5 and the sixth valve body 6 selectively connect the bidirectional hydraulic pump 7 to the oil circuit, allowing the hydraulic suspension system 100 to switch between active and passive power regulation modes.

[0076] As shown in Figures 1-3, the hydraulic suspension system 100 has a first active power adjustment mode, a second active power adjustment mode, and a passive adjustment mode. As shown in Figure 1, when the hydraulic suspension system 100 is in the passive adjustment mode, the ninth valve port K is disconnected from the tenth valve port L, and the eleventh valve port M is disconnected from the twelfth valve port N, eliminating the bidirectional hydraulic pump 7 from the oil circuit. At this point, the hydraulic suspension system 100 maintains pressure balance in the oil circuit via the third accumulator 20.

[0077] The hydraulic suspension system 100 of some embodiments of the present disclosure can achieve rapid switching among multiple working modes by providing multiple valve bodies, multiple accumulators, multiple damping valves and multiple one-way valves, and realize independent control of the passive adjustment mode, the second active power adjustment mode and the first active power adjustment mode without affecting each other.

[0078] Compared with the related art, the first active force adjustment mode of the hydraulic suspension system 100 of some embodiments of the present disclosure can achieve higher conversion efficiency and faster adjustment rate, and has a larger active force adjustment range, so that the hydraulic suspension system 100 can not only realize basic functions such as vertical control, roll and pitch stability, but also enable the vehicle equipped with the hydraulic suspension system 100 to realize three-wheel driving, on-the-spot jumping and assisted escape functions. In medium and low frequency road conditions, the hydraulic suspension system 100 can switch to the second active force adjustment mode to coordinate the active force and damping force, so as to ensure the smooth driving of the vehicle. In road conditions, the hydraulic suspension system 100 can switch to the passive adjustment mode for damping adjustment, which can save the battery power of the entire vehicle and can take into account economy, comfort and handling stability at a high frequency.

[0079] Here, the above-mentioned medium-low frequency traffic conditions and high frequency traffic conditions are a way to classify the traffic flow of a certain road section or area. Generally, traffic flow can be divided into different levels according to frequency and intensity.

[0080] High-frequency traffic refers to roads with very high traffic volume, such as major urban arterials or thoroughfares. Medium-frequency traffic refers to roads with moderate traffic volume, such as secondary roads or major roads during off-peak hours. Low-frequency traffic refers to roads with low traffic volume, typically found on remote or less-used roads.

[0081] In some embodiments of the present disclosure, the operating mode of the hydraulic suspension system 100 is controlled by a suspension controller, which determines the operating mode of the hydraulic suspension system 100 by collecting road surface signals, driving mode signals (for vehicles with driving mode selection), suspension acceleration signals, suspension displacement signals, vehicle body acceleration signals, vehicle speed signals, steering wheel angle signals, battery charge signals, etc. Furthermore, the first valve body 9, the second valve body 10, the third valve body 13, the fourth valve body 14, the fifth valve body 5, and the sixth valve body 6 are all two-position, two-way valves. The first valve body 9, the second valve body 10, the third valve body 13, the fourth valve body 14, the fifth valve body 5, the sixth valve body 6, the first damping valve 19, and the second damping valve 21 in the hydraulic suspension system 100, which are controlled by current signals, are all controlled by the suspension controller.

[0082] As shown in FIG1 , the passive adjustment mode according to some embodiments of the present disclosure is:

[0083] The suspension controller analyzes the collected signals and determines that the hydraulic suspension system 100 should be in the passive adjustment mode;

[0084] In the passive adjustment mode, the suspension controller controls the third valve body 13 and the fourth valve body 14 to be in the on state, and the first valve body 9, the second valve body 10, the fifth valve body 5 and the sixth valve body 6 to be in the off state. At this time, the third accumulator 20 is connected to the oil circuit, and the bidirectional drive motor 8, the first accumulator 11 and the second accumulator 12 are not connected to the oil circuit.

[0085] When the wheel moves upward or the vehicle body moves downward, the medium in the second chamber 4 is squeezed and flows through the fourth valve body 14, the third one-way valve 18, and the second damping valve 21. The opening of the second damping valve 21 can be adjusted by varying the input current, thereby adjusting the damping force of the second damping valve 21 in the passive adjustment mode. The first portion of the medium enters the third accumulator 20, while the second portion flows through the second one-way valve 15 and enters the first chamber 2.

[0086] When the wheel moves downward or the vehicle body moves upward, the medium in the first chamber 2 is squeezed and flows through the third valve body 13, the first one-way valve 16, and the first damping valve 19. By adjusting the opening of the first damping valve 19 by varying the input current, the damping force in the passive adjustment mode can be adjusted. The third accumulator 20 replenishes medium to the oil circuit. This replenished medium, along with the medium flowing through the first damping valve 19, flows through the fourth one-way valve 17 and the fourth valve body 14 into the second chamber 4.

[0087] As shown in FIG2 , the second active power adjustment mode according to some embodiments of the present disclosure is:

[0088] The suspension controller analyzes the collected signals and determines that the hydraulic suspension system 100 should be in the second active force adjustment mode;

[0089] In the second active power working mode, the suspension controller controls the fifth valve body 5 and the sixth valve body 6; the third valve body 13 and the fourth valve body 14 are in the on state, and the first valve body 9 and the second valve body 10 are in the off state. At this time, the bidirectional drive motor 8 and the third accumulator 20 are connected to the oil circuit, and the first accumulator 11 and the second accumulator 12 are not connected to the oil circuit.

[0090] When the suspension controller determines that the wheel needs to move upward or the vehicle body needs to move downward, the bidirectional drive motor 8 drives the bidirectional hydraulic pump 7 to work, and the high-pressure oil flows through the fifth valve body 5 and pushes the piston 3 to move downward. The medium in the second chamber 4 is squeezed, flows through the sixth valve body 6, and flows back to the bidirectional hydraulic pump 7. The excess medium flows through the fourth valve body 14, the third one-way valve 18, and the second damping valve 21, and enters the third accumulator 20 until the pressure of the hydraulic suspension system 100 is balanced, thereby realizing coordinated control of low active force and damping adjustment.

[0091] When the suspension controller determines that the wheel needs to move downward or the vehicle body needs to move upward, the bidirectional drive motor 8 drives the bidirectional hydraulic pump 7 to work, and the high-pressure oil flows through the sixth valve body 6 and pushes the piston 3 to move upward. The medium in the first chamber 2 is squeezed, flows through the fifth valve body 5, and flows back to the bidirectional hydraulic pump 7. The excess medium flows through the third valve body 13, the first one-way valve 16, and the first damping valve 19, and under the action of the liquid pressure in the third accumulator 20, flows through the fourth one-way valve 17 and the fourth valve body 14, and is replenished into the bidirectional hydraulic pump 7 until the pressure of the hydraulic suspension system 100 is balanced, thereby realizing the coordinated control of low active force and damping adjustment.

[0092] As shown in FIG3 , the first active power adjustment mode according to some embodiments of the present disclosure is:

[0093] The suspension controller analyzes the collected signals and determines that the hydraulic suspension system 100 should be in the first active force adjustment mode;

[0094] In the first active power working mode, the suspension controller controls the fifth valve body 5, the sixth valve body 6, the first valve body 9, and the second valve body 10 to be in the on state, and the third valve body 13 and the fourth valve body 14 to be in the off state. At this time, the bidirectional drive motor 8, the first accumulator 11 and the second accumulator 12 are connected to the oil circuit, and the third accumulator 20 is not connected to the oil circuit.

[0095] When the suspension controller determines that the wheels need to move upward or the vehicle body needs to move downward, the bidirectional drive motor 8 drives the bidirectional hydraulic pump 7 to work, and the high-pressure oil flows through the fifth valve body 5, pushing the piston 3 to move downward. The medium in the second chamber 4 of the hydraulic cylinder 101 is squeezed, flows through the sixth valve body 6, and flows back to the bidirectional hydraulic pump 7. The first accumulator 11 and the second accumulator 12 are used to store and replenish the system oil, reducing the pressure pulsation of the hydraulic suspension system 100 until the pressure of the hydraulic suspension system 100 is balanced, thereby achieving high active force regulation.

[0096] When the suspension controller determines that the wheel needs to move downward or the vehicle body needs to move upward, the bidirectional drive motor 8 drives the bidirectional hydraulic pump 7 to work, and the high-pressure oil flows through the sixth valve body 6, pushing the piston 3 to move upward. The medium in the first chamber 2 of the hydraulic cylinder 101 is squeezed, flows through the fifth valve body 5, and flows back to the bidirectional hydraulic pump 7. The first accumulator 11 and the second accumulator 12 are used to store and replenish the system oil, reducing the pressure pulsation of the hydraulic suspension system 100 until the pressure of the hydraulic suspension system 100 is balanced, thereby achieving high active force regulation.

[0097] To sum up, according to some embodiments of the present disclosure, the hydraulic suspension system 100 is provided with a power module 102 and a first energy storage module 103 that can selectively participate in the oil circuit pressure regulation. In the active power regulation mode, there is no other valve body or structure for diversion, which can effectively ensure that the hydraulic suspension system 100 has sufficient energy, so that the hydraulic suspension system 100 has higher conversion efficiency and faster regulation rate. The hydraulic suspension system 100 has higher working efficiency and a larger active power regulation range.

[0098] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0099] While embodiments of the present disclosure have been shown and described above, alterations, modifications, substitutions, and variations may be made to the embodiments described above.

Claims

1. A hydraulic suspension system comprising: A hydraulic cylinder (101), wherein a piston (3) is movably provided in the hydraulic cylinder (101), and the piston (3) divides the interior of the hydraulic cylinder (101) into a first cavity (2) and a second cavity (4); A power module (102), the power module (102) having a first interface (A) and a second interface (B), the first interface (A) being selectively connected to the first cavity (2), and the second interface (B) being selectively connected to the second cavity (4), the power module (102) being configured to drive a medium to flow from the first interface (A) toward the second interface (B) or to drive the medium to flow from the second interface (B) toward the first interface (A); and A first energy storage module (103), wherein the first energy storage module (103) has a first energy storage chamber and a second energy storage chamber, wherein the first energy storage chamber can be selectively communicated with the first cavity (2), and the second energy storage chamber can be selectively communicated with the second cavity (4).

2. The hydraulic suspension system according to claim 1, further comprising at least one of the following: a first valve body (9), the first valve body (9) having a first valve port (C) and a second valve port (D) that are selectively connectable to each other, the first valve port (C) being connected to the first interface (A), and the second valve port (D) being connected to the first cavity (2) and the first energy storage cavity, respectively; or A second valve body (10), wherein the second valve body (10) has a third valve port (E) and a fourth valve port (F) that are selectively connectable to each other, the third valve port (E) being connected to the second interface (B), and the fourth valve port (F) being connected to the second chamber (4) and the second energy storage chamber, respectively.

3. The hydraulic suspension system according to claim 2, wherein: The first energy storage module (103) comprises: a first accumulator (11), the first accumulator (11) having a first accumulator chamber, the first accumulator (11) being connected to the second valve port (D); and A second accumulator (12), wherein the second accumulator (12) has a second accumulator chamber, and the second accumulator (12) is connected to the fourth valve port (F); The hydraulic suspension system has a first active power adjustment mode. When the hydraulic suspension system is in the first active power adjustment mode, the first valve port (C) is connected to the second valve port (D), and the third valve port (E) is connected to the fourth valve port (F).

4. The hydraulic suspension system according to claim 2 or 3, further comprising: A second energy storage module (104), wherein the second energy storage module (104) has a third energy storage chamber; a third valve body (13), the third valve body (13) having a fifth valve port (G) and a sixth valve port (H) which are selectively connectable to each other, the fifth valve port (G) being connected to the third energy storage chamber, and the sixth valve port (H) being connected to the first chamber (2) and the first energy storage chamber respectively; and A fourth valve body (14), the fourth valve body (14) having a seventh valve port (I) and an eighth valve port (J) that are selectively connectable to each other, the seventh valve port (I) being connected to the third energy storage chamber, and the eighth valve port (J) being connected to the second chamber (4) and the second energy storage chamber, respectively.

5. The hydraulic suspension system according to claim 4, wherein: The seventh valve port (I) and the eighth valve port (J) are configured to be connected when the fifth valve port (G) and the sixth valve port (H) are connected, so that the third energy storage chamber is connected to the first chamber (2) and the second chamber (4) at the same time.

6. The hydraulic suspension system according to claim 5, wherein: The second energy storage module (104) comprises: a third accumulator (20), the third accumulator (20) having the third accumulator chamber; a first valve group (22), wherein a first energy storage interface (O) and a third interface (P) communicating with the first energy storage interface (O) are formed on the first valve group (22), the first energy storage interface (O) being in communication with the fifth valve port (G), and the third interface (P) being in communication with the third energy storage chamber, and the first valve group (22) being configured to selectively guide the medium to flow from the first energy storage interface (O) toward the third interface (P) or to guide the medium to flow from the third interface (P) toward the first energy storage interface (O); and A second valve group (23), wherein a second energy storage interface (Q) and a fourth interface (R) communicating with the second energy storage interface (Q) are formed on the second valve group (23), the second energy storage interface (Q) is communicated with the seventh valve port (I), and the fourth interface (R) is communicated with the third energy storage chamber, and the second valve group (23) is configured to selectively guide the medium to flow from the second energy storage interface (Q) toward the fourth interface (R) or to guide the medium to flow from the fourth interface (R) toward the second energy storage interface (Q); wherein The hydraulic suspension system has a second active power adjustment mode. When the hydraulic suspension system is in the second active power adjustment mode, the first valve port (C) is disconnected from the second valve port (D), the third valve port (E) is disconnected from the fourth valve port (F), the fifth valve port (G) is connected to the sixth valve port (H), and the seventh valve port (I) is connected to the eighth valve port (J).

7. The hydraulic suspension system according to claim 6, wherein: The first valve group (22) comprises: a first damping valve (19), the first damping valve (19) having a fifth port and the third port (P); a first one-way valve (16), the first one-way valve (16) having a first inlet and a first outlet, the first inlet of the first one-way valve (16) being in communication with the first energy storage interface (O), and the first outlet of the first one-way valve (16) being in communication with the fifth interface; and A second one-way valve (15), wherein the second one-way valve (15) has a second inlet and a second outlet, the second inlet of the second one-way valve (15) is connected to the third interface (P), and the second outlet of the second one-way valve (15) is connected to the first energy storage interface (O).

8. The hydraulic suspension system according to claim 6, wherein: The second valve group (23) comprises: a second damping valve (21), the second damping valve (21) having a sixth port and the fourth port (R); a third one-way valve (18), the third one-way valve (18) having a third inlet and a third outlet, the third inlet of the third one-way valve (18) being in communication with the second energy storage interface (Q), and the third outlet of the third one-way valve (18) being in communication with the sixth interface; and A fourth one-way valve (17), the fourth one-way valve (17) having a fourth inlet and a fourth outlet, the fourth inlet of the fourth one-way valve (17) being in communication with the fourth port (R), and the fourth outlet of the fourth one-way valve (17) being in communication with the second energy storage port (Q).

9. The hydraulic suspension system according to any one of claims 1 to 8, wherein: The power module (102) comprises: a bidirectional hydraulic pump (7), the bidirectional hydraulic pump (7) having the first interface (A) and the second interface (B), the bidirectional hydraulic pump (7) being configured to selectively drive the medium to flow from the first interface (A) toward the second interface (B) or to drive the medium to flow from the second interface (B) toward the first interface (A); and A bidirectional drive motor (8) having a drive end connected to the bidirectional hydraulic pump (7).

10. The hydraulic suspension system according to claim 9, further comprising at least one of the following: a fifth valve body (5), the fifth valve body (5) having a ninth valve port (K) and a tenth valve port (L) which are selectively connectable to each other, the ninth valve port (K) being connected to the first interface (A), and the tenth valve port (L) being connected to the first cavity (2); or a sixth valve body (6), the sixth valve body (6) having an eleventh valve port (M) and a twelfth valve port (N) that are selectively connectable to each other, the eleventh valve port (M) being connected to the second interface (B), and the twelfth valve port (N) being connected to the second cavity (4); The hydraulic suspension system has a passive adjustment mode. When the hydraulic suspension system is in the passive adjustment mode, the ninth valve port (K) is disconnected from the tenth valve port (L), and the eleventh valve port (M) is disconnected from the twelfth valve port (N).

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