Hydraulic suspension system

Abstract

The present invention discloses a hydraulic suspension system, comprising: a hydraulic cylinder, a power module, and a first energy storage module, wherein 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, the first interface is selectively connected to the first cavity, and the second interface is selectively connected to the second cavity, and the power module is suitable for driving a medium to flow from the first interface toward the second interface or 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, 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. The hydraulic suspension system designed according to the present invention has higher conversion efficiency and faster adjustment rate, higher system working efficiency, and a larger active force adjustment range.

Description

Technical Field

[0001] The present invention relates to the field of hydraulic suspension systems, in particular to a hydraulic suspension system. Background Art

[0002] In the related art, a vehicle is provided with a hydraulic suspension system to provide power for the vehicle, thereby reducing vibrations caused by uneven road surfaces. To ensure the effectiveness of the hydraulic suspension system in providing power, in some existing hydraulic suspension systems, the main force adjustment module and the damping adjustment module are connected in parallel to form two independent closed loops. 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 action, 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 order to prevent the damping force of the damping valve from being too large, the system is provided 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. Summary of the Invention

[0003] The present invention aims to address at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a hydraulic suspension system. The hydraulic suspension system designed according to the present invention has higher conversion efficiency and faster adjustment rate, resulting in higher system efficiency and a wider range of active power adjustment.

[0004] According to the present invention, the hydraulic suspension system includes: a hydraulic cylinder, in which a piston is movably provided, and the piston divides the interior of the hydraulic cylinder into a first cavity and a second cavity; a power module, the power module having a first interface and a second interface, the first interface being selectively connected to the first cavity, and the second interface being selectively connected to the second cavity, and the power module being suitable for driving the medium to flow from the first interface toward the second interface or driving the medium to flow from the second interface toward the first interface; a first energy storage module, the first energy storage module having a first energy storage chamber and a second energy storage chamber, the first energy storage chamber being selectively connected to the first cavity, and the second energy storage chamber being selectively connected to the second cavity.

[0005] According to the present invention, the hydraulic suspension system is provided with a power module and a first energy storage module that can optionally participate in the oil circuit pressure regulation, and when the power module is working, the hydraulic suspension system is in the main power regulation mode. In the main power regulation mode, there is no other valve body or structure for diversion, which can effectively ensure that the system has sufficient energy, can achieve higher conversion efficiency and faster regulation rate, and improve the system working efficiency, so that the system can have a larger main power regulation range.

[0006] According to some embodiments of the present invention, the hydraulic suspension system further includes: a first valve body, the first valve body having a first valve port and a second valve port that can be selectively connected to each other, the first valve port is connected to the first interface, and the second valve port is connected to the first cavity and the first energy storage chamber, respectively; and / or a second valve body, the second valve body having a third valve port and a fourth valve port that can be selectively connected to each other, the third valve port is connected to the second interface, and the fourth valve port is connected to the second cavity and the second energy storage chamber, respectively.

[0007] According to some embodiments of the present invention, the first energy storage module includes: a first accumulator, the first accumulator having a first energy storage chamber, and the first accumulator is connected to the second valve port; a second accumulator, the second accumulator having a second energy storage chamber, and the second accumulator is connected to the fourth valve port; wherein the hydraulic suspension system has a high active power adjustment mode, when the hydraulic suspension system is in the high active power adjustment mode, the first valve port is connected to the second valve port, and the third valve port is connected to the fourth valve port.

[0008] According to some embodiments of the present invention, the hydraulic suspension system also includes: a second energy storage module, the second energy storage module having a third energy storage chamber; a third valve body, the third valve body having a fifth valve port and a sixth valve port that can be selectively connected to each other, the fifth valve port is connected to the third energy storage chamber, and the sixth valve port is connected to the first chamber and the first energy storage chamber, respectively; a fourth valve body, the fourth valve body having a seventh valve port and an eighth valve port that can be selectively connected to each other, the seventh valve port is connected to the third energy storage chamber, and the eighth valve port is connected to the second chamber and the second energy storage chamber, respectively.

[0009] According to some embodiments of the present invention, when the fifth valve port is connected to the sixth valve port, the seventh valve port is connected to the eighth valve port, so that the third energy storage chamber is connected to the first cavity and the second cavity at the same time.

[0010] According to some embodiments of the present invention, the second energy storage module includes: a third accumulator, the third accumulator having the third energy storage chamber; a first valve group, the first valve group having a first energy storage interface and a third interface communicating with the first energy storage interface, the first energy storage interface communicating with the fifth valve port, the third interface communicating with the third energy storage chamber, the first valve group selectively guiding the medium to flow from the first energy storage interface toward the third interface or guiding the medium to flow from the third interface toward the first energy storage interface; a second valve group, the second valve group having a second energy storage interface and a third interface communicating with the second energy storage interface The fourth interface is connected, 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 can selectively guide the medium to flow from the second energy storage interface toward the fourth interface or guide the medium to flow from the fourth interface toward the second energy storage interface; wherein the hydraulic suspension system has a low active force adjustment mode. When the hydraulic suspension system is in the low active force 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.

[0011] According to some embodiments of the present invention, the first valve group includes: a first damping valve, the first damping valve having a fifth interface and the third interface; a first one-way valve, the first one-way valve having an inlet and an outlet, the inlet of the first one-way valve being connected to the first energy storage interface, and the outlet of the first one-way valve being connected to the fifth interface; a second one-way valve, the second one-way valve having an inlet and an outlet, the inlet of the second one-way valve being connected to the third interface, and the outlet of the second one-way valve being connected to the first energy storage interface.

[0012] According to some embodiments of the present invention, the second valve group includes: a second damping valve, the second damping valve having a sixth interface and the fourth interface; a third one-way valve, the third one-way valve having an inlet and an outlet, the inlet of the third one-way valve being connected to the second energy storage interface, and the outlet of the third one-way valve being connected to the sixth interface; a fourth one-way valve, the fourth one-way valve having an inlet and an outlet, the inlet of the fourth one-way valve being connected to the fourth interface, and the outlet of the fourth one-way valve being connected to the second energy storage interface.

[0013] According to some embodiments of the present invention, the power module includes: a bidirectional hydraulic pump, the bidirectional hydraulic pump having the first interface and the second interface, the bidirectional hydraulic pump being suitable for selectively driving the medium to flow from the first interface toward the second interface or driving the medium to flow from the second interface toward the first interface; a bidirectional drive motor, the bidirectional drive motor having a drive end, and the drive end being connected to the bidirectional hydraulic pump.

[0014] According to some embodiments of the present invention, the hydraulic suspension system further includes: a fifth valve body, the fifth valve body having a ninth valve port and a tenth valve port that can be 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; and / or a sixth valve body, the sixth valve body having an eleventh valve port and a twelfth valve port that can be 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; wherein the hydraulic suspension system has a passive adjustment mode, and 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.

[0015] To sum up, the hydraulic suspension system according to the present invention is provided with a power module and a first energy storage module 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 system has sufficient energy, so that the hydraulic suspension system has higher conversion efficiency and faster regulation rate, the system working efficiency is higher, and the main power regulation range is larger.

[0016] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0018] Figure 1 3 is an exemplary diagram of a passive working mode of a hydraulic suspension system according to an embodiment of the present invention.

[0019] Figure 2 3 is an example diagram of a low active force adjustment mode of a hydraulic suspension system according to an embodiment of the present invention.

[0020] Figure 3 1 is an example diagram of a high-active force adjustment mode of a hydraulic suspension system according to an embodiment of the present invention.

[0021] Reference numerals:

[0022] 100. Hydraulic suspension system;

[0023] 1. Piston rod; 2. First cavity; 3. Piston; 4. Second cavity;

[0024] 7. Bidirectional hydraulic pump; a. First interface; b. Second interface; 8. Bidirectional drive motor;

[0025] 5, fifth valve body; k, ninth valve port; L, tenth valve port;

[0026] 6, sixth valve body; m, eleventh valve port; n, twelfth valve port;

[0027] 11. First accumulator; 12. Second accumulator;

[0028] 9. First valve body; c. First valve port; d. Second valve port;

[0029] 10. Second valve body; e. Third valve port; f. Fourth valve port;

[0030] 20. Third accumulator;

[0031] 19. First damping valve; 16. First one-way valve; 15. Second one-way valve;

[0032] 21. Second damping valve; 18. Third one-way valve; 17. Fourth one-way valve;

[0033] 13. Third valve body; g. Fifth valve port; h. Sixth valve port;

[0034] 14. Fourth valve body; i. Seventh valve port; j. Eighth valve port. DETAILED DESCRIPTION

[0035] The following describes embodiments of the present invention in detail. 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 intended only to explain the present invention and are not to be construed as limiting the present invention.

[0036] In the description of the present invention, 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 invention and simplifying the description, rather than indicating or implying 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 limiting the present invention.

[0037] 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 specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0038] In the present invention, 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 or detachable connections, or integration; mechanical or electrical connections, or communication; direct 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 the above terms in the present invention based on specific circumstances.

[0039] In the present invention, 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. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0040] In the related art, a vehicle is provided with a hydraulic suspension system to provide power for the vehicle, thereby reducing vibrations caused by uneven road surfaces. To ensure the effectiveness of the hydraulic suspension system in providing power, in some existing hydraulic suspension systems, the main force adjustment module and the damping adjustment module are connected in parallel to form two independent closed loops. 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 action, 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 order to prevent the damping force of the damping valve from being too large, the system is provided 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.

[0041] Reference below Figure 1-Figure 3 A hydraulic suspension system 100 according to an embodiment of the present invention is described.

[0042] like Figure 1-Figure 3As shown, the hydraulic suspension system 100 according to the present invention includes: a hydraulic cylinder, a power module, and a first energy storage module. A piston 3 is movably disposed within the hydraulic cylinder, which divides the interior of the hydraulic cylinder into a first chamber 2 and a second chamber 4. The power module has a first port a and a second port b, with the first port a selectively communicating with the first chamber 2 and the second port b selectively communicating with the second chamber 4. The power module is adapted to drive a medium to flow from the first port a toward the second port b or from the second port b toward the first port a. The first energy storage module has a first energy storage chamber and a second energy storage chamber, with the first energy storage chamber selectively communicating with the first chamber 2 and the second energy storage chamber selectively communicating with the second chamber 4. The hydraulic cylinder is divided into the first chamber 2 and the second chamber 4 by the piston 3. The piston 3 is connected to a piston rod 1, one end of which is connected to the piston 3, and the other end of which extends from the first chamber 2 to the outside of the hydraulic cylinder and connects to the sprung mass member. The bottom of the hydraulic cylinder is connected to the unsprung mass member. Because the piston rod 1 occupies the space of the first cavity 2, when the piston 3 moves, the change in the medium in the first cavity 2 is smaller than the change in the medium in the second cavity 4. In the oil circuit of the hydraulic suspension system 100, the power module and the first energy storage module can optionally participate in pressure regulation in the oil circuit.

[0043] Specifically, when the power module 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. Under the action of the power module, the medium can flow from the first cavity 2 through the power module and enter 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 a, and the amount of medium required by the second cavity 4 is b, a<b, 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, the first energy storage chamber and / or the second energy storage chamber of the first energy storage module can be made to replenish the medium into the flow path and the medium replenishment amount is c, c=ba. At this time, the first energy storage chamber and / or the second energy storage chamber are used to replenish the medium into the system to reduce the system pressure pulsation until the system pressure balance is reached; during the operation of the power module In use, the medium can also flow from the second cavity 4 through the power module 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 b. The amount of medium required by the first cavity 2 is a, b>a, 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 the first energy storage cavity and / or the second energy storage cavity and the excess medium amount is c, c+a=b. At this time, the first energy storage cavity and / or the second energy storage cavity are used to store excess medium in the system to reduce system pressure pulsation until the system pressure balance is reached, thereby realizing the power regulation of the system.

[0044] It is worth mentioning that the power module drives the medium to flow from the first cavity 2 through the power module and into the second cavity 4 to move the piston 3 upward. At this time, the hydraulic suspension system 100 executes the instruction for the wheel to move downward or the body to move upward; the power module drives the medium to flow from the second cavity 4 through the power module and into the first cavity 2 to move the piston 3 downward. At this time, the hydraulic suspension system 100 executes the instruction for the wheel to move upward or the body to move downward.

[0045] According to the present invention, the hydraulic suspension system 100 is provided with a power module and a first energy storage module that can optionally participate in oil circuit pressure regulation. When the power module is working, the hydraulic suspension system 100 is in the main power regulation mode. In the main power regulation mode, there is no other valve body or structure for diversion, which can effectively ensure that the system has sufficient energy, can achieve higher conversion efficiency and faster regulation rate, and improve the system working efficiency, so that the system can have a larger main power regulation range.

[0046] According to some embodiments of the present invention, Figure 1-Figure 3 As shown, the hydraulic suspension system 100 further includes a first valve body 9 and / 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 communicates with the first interface a, and the second valve port d communicates with 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 communicates with the second interface b, and the fourth valve port f communicates with the second chamber 4 and the second energy storage chamber, respectively. Specifically, 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.

[0047] Under the action of the power module, the medium flows from the first cavity 2 through the power module and into the second cavity 4 to move the piston 3 upward. At this time, the first valve body 9 can be made to connect the first energy storage chamber with the first cavity 2, or the second valve body 10 can be made to connect the second energy storage chamber with the second cavity 4, so that the first energy storage chamber and / or the second energy storage chamber replenish the medium into the flow path to reduce the system pressure pulsation until the system pressure is balanced; or, under the action of the power module, the medium flows from the second cavity 4 through the power module and into the first cavity 2 to move the piston 3 downward. At this time, the first valve body 9 can be made to connect the first energy storage chamber with the first cavity 2, or the second valve body 10 can be made to connect the second energy storage chamber with the second cavity 4, so that the first energy storage chamber and / or the second energy storage chamber store excess medium in the system to reduce the system pressure pulsation until the system pressure is balanced, thereby realizing the power regulation of the system. Preferably, when the power module is working, the first valve body 9 connects the first energy storage chamber with the first cavity 2 and the second valve body 10 connects the second energy storage chamber with the second cavity 4, so that the hydraulic suspension system 100 can timely regulate the oil circuit pressure.

[0048] 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.

[0049] According to some embodiments of the present invention, Figure 1-Figure 3 As shown, the first energy storage module includes a first energy storage device 11 and a second energy storage device 12, wherein the first energy storage chamber and the second energy storage chamber are respectively configured as chambers of the two energy storage devices, wherein the first energy storage device 11 has a first energy storage chamber, and the first energy storage device 11 is connected to the second valve port d; the second energy storage device 12 has a second energy storage chamber, and the second energy storage device 12 is connected to the fourth valve port f. Figure 3 As shown, the hydraulic suspension system 100 has a high active power regulation mode. When the hydraulic suspension system 100 is in high 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. Specifically, the power module can operate to place the hydraulic suspension system 100 in the active power regulation mode. When the hydraulic suspension system 100 is in high active power regulation mode, the first valve body 9 connects the first energy storage chamber with the first cavity 2, and the second valve body 10 connects the second energy storage chamber with the second cavity 4. The first accumulator 11 and the second accumulator 12 store and replenish the medium in the oil circuit, reducing system pressure pulsation until system pressure balance is achieved, thereby achieving high active power regulation.

[0050] According to some embodiments of the present invention, Figure 1-Figure 3 As shown, the hydraulic suspension system 100 further includes a second energy storage module, a third valve body 13, and a fourth valve body 14. The second energy storage module 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 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 system pressure.

[0051] According to some embodiments of the present invention, Figure 1-Figure 3 As shown, when the fifth valve port g and the sixth valve port h are connected, the seventh valve port i and the eighth valve port j are connected, so that the second energy storage module is connected to the oil circuit, and the third energy storage chamber is connected to the first chamber 2 and the second chamber 4 at the same time. The third valve body 13 and the fourth valve body 14 connect the second energy storage module to the oil circuit when the hydraulic suspension system 100 needs to introduce the third energy storage chamber, so as to avoid diverting the medium in the oil circuit to the second energy storage module in the high active power regulation mode, thereby ensuring the power regulation efficiency of the whole vehicle.

[0052] According to some embodiments of the present invention, Figure 1-Figure 3 As shown, the second energy storage module includes a third accumulator 20, a first valve group and a second valve group, and the third accumulator 20 has a third energy storage chamber; a first energy storage interface and a third interface connected to the first energy storage interface are formed on the first valve group, the first energy storage interface is connected to the fifth valve port g, and the third interface is connected to the third energy storage chamber, and the first valve group can selectively guide the medium to flow from the first energy storage interface toward the third interface or guide the medium to flow from the third interface toward the first energy storage interface; a second energy storage interface and a fourth interface connected to the second energy storage interface are formed on the second valve group, the second energy storage interface is connected to the seventh valve port i, and the fourth interface is connected to the third energy storage chamber, and the second valve group can selectively guide the medium to flow from the second energy storage interface toward the fourth interface or guide the medium to flow from the fourth interface toward the second energy storage interface.

[0053] like Figure 2 As shown, hydraulic suspension system 100 has a low active power adjustment mode. When in this mode, first valve port c is disconnected from second valve port d, third valve port e is disconnected from fourth valve port f, fifth valve port g is connected to sixth valve port h, and seventh valve port i is connected to eighth valve port j. In this mode, first valve body 9 and second valve body 10 are disconnected, removing first accumulator 11 and second accumulator 12 from the oil circuit. Third valve body 13 and fourth valve body 14 are connected, connecting third accumulator 20 to the oil circuit.

[0054] According to some embodiments of the present invention, Figure 1-Figure 3As shown, the first valve group 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 interface and a third interface; the first one-way valve 16 has an inlet and an outlet, the inlet of the first one-way valve 16 is connected to the first energy storage interface, and the outlet of the first one-way valve 16 is connected to the fifth interface; the second one-way valve 15 has an inlet and an outlet, the inlet of the second one-way valve 15 is connected to the third interface, and the outlet of the second one-way valve 15 is connected to the first energy storage interface. Specifically, when it is necessary to execute the upward movement of the wheel or the downward movement of the vehicle body, the power module drives the medium to flow from the second cavity 4 through the power module 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, and enters the third accumulator 20 until the system pressure balance is reached, thereby realizing the coordinated control of low active force and damping adjustment; when it is necessary to execute the downward movement of the wheel or the upward movement of the vehicle body, the power module drives the medium to flow from the first cavity 2 through the power module and into the second cavity 4 to move the piston 3 upward, and the excess liquid flows through the third valve body 13, the first one-way valve 16, the first damping valve 19 and under the action of the liquid pressure in the third accumulator 20, flows through the second valve group to replenish the oil circuit until the system pressure balance is reached, thereby realizing the coordinated control of low active force and damping adjustment.

[0055] According to some embodiments of the present invention, Figure 1-Figure 3 As shown, the second valve group 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 interface and a fourth interface; the third one-way valve 18 has an inlet and an outlet, the inlet of the third one-way valve 18 is connected to the second energy storage interface, and the outlet of the third one-way valve 18 is connected to the sixth interface; the fourth one-way valve 17 has an inlet and an outlet, the inlet of the fourth one-way valve 17 is connected to the fourth interface, and the outlet of the fourth one-way valve 17 is connected to the second energy storage interface. Specifically, when it is necessary to execute the upward movement of the wheel or the downward movement of the vehicle body, the power module drives the medium to flow from the second cavity 4 through the power module 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 into the third accumulator 20 until the system pressure balance is reached, thereby realizing the coordinated control of low active force and damping adjustment; when it is necessary to execute the downward movement of the wheel or the upward movement of the vehicle body, the power module drives the medium to flow from the first cavity 2 through the power module and into the second cavity 4 to move the piston 3 upward, and the excess liquid 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 under the action of the liquid pressure in the third accumulator 20 to replenish the oil circuit until the system pressure balance is reached, thereby realizing the coordinated control of low active force and damping adjustment.

[0056] According to some embodiments of the present invention, Figure 1-Figure 3As shown, the power module includes a bidirectional hydraulic pump 7 and a bidirectional drive motor 8. The bidirectional hydraulic pump 7 has a first port a and a second port b. The bidirectional hydraulic pump 7 is adapted to selectively drive the medium to flow from the first port a toward the second port b or from the second port b toward the first port a. The bidirectional drive motor 8 has a drive end connected to the bidirectional hydraulic pump 7. Specifically, the bidirectional hydraulic pump 7 is electrically connected to the bidirectional drive motor 8. Driven by the bidirectional drive motor 8, the bidirectional hydraulic pump 7 can 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.

[0057] According to some embodiments of the present invention, Figure 1-Figure 3 As shown, the hydraulic suspension system 100 further includes a fifth valve body 5 and / 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 cavity 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 cavity 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 an active power regulation mode and a passive power regulation mode.

[0058] like Figure 1-Figure 3 As shown, the hydraulic suspension system 100 has a high active force adjustment mode, a low active force adjustment mode and a passive adjustment mode. Figure 1 As shown, 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, so that the bidirectional hydraulic pump 7 is not in the oil circuit. At this time, the hydraulic suspension system 100 maintains the pressure balance in the oil circuit through the third accumulator 20.

[0059] This application enables the hydraulic suspension system 100 to quickly switch between multiple working modes by setting multiple valve bodies, multiple accumulators, multiple damping valves and multiple one-way valves, and realizes independent control of passive mode, low active force adjustment mode and high active force adjustment mode without affecting each other.

[0060] Compared with the prior art, the high active force adjustment mode of the hydraulic suspension system 100 of the present application 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, jumping on the spot and assisting in getting out of trouble. In medium and low frequency road conditions, the hydraulic suspension system 100 can switch to the low active force adjustment mode to coordinate the active force and damping force, so as to ensure smooth driving of the vehicle. In high frequency road conditions, the hydraulic suspension system 100 can switch to the passive adjustment mode for damping adjustment, which can save the entire vehicle's electricity and take into account economy, comfort and handling stability.

[0061] In some specific embodiments of the present invention, the operating mode of the hydraulic suspension system 100 of the present application 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 power signals, etc. In addition, 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.

[0062] like Figure 1 As shown, the passive working mode according to the embodiment of the present application is:

[0063] The suspension controller analyzes the collected signals and determines that the system should be in passive working mode;

[0064] In the passive working mode, the suspension controller controls the third valve body 13 and the fourth valve body 14 to be in the conducting 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 disconnected 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;

[0065] When the wheel moves upward or the vehicle body moves downward, the liquid 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. Here, the opening of the second damping valve 21 can be adjusted by changing the input current, and the damping force of the second damping valve 21 in the passive adjustment mode can be adjusted. Part of the medium enters the third accumulator 20, and the other part of the medium flows through the second one-way valve 15 and enters the first chamber 2.

[0066] When the wheel moves downward or the vehicle body moves upward, the liquid in the first cavity 2 is squeezed and flows through the third valve body 13, the first one-way valve 16, and the first damping valve 19. Here, the opening of the first damping valve 19 is adjusted by changing the input current, so that the damping force in the passive adjustment mode can be adjusted. The third accumulator 20 replenishes the medium to the oil circuit. The replenished medium and the medium flowing through the first damping valve 19 flow through the fourth one-way valve 17 and the fourth valve body 14 into the second cavity 4.

[0067] like Figure 2 As shown, the low active power working mode according to the embodiment of the present application is:

[0068] The suspension controller analyzes the collected signals and determines that the system should be in low active power working mode.

[0069] In the low 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 conducting state, and the first valve body 9 and the second valve body 10 are in the disconnected state. At this time, the bidirectional drive motor 8 and the third accumulator 20 are connected to the oil circuit, while the first accumulator 11 and the second accumulator 12 are not connected to the oil circuit;

[0070] 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 liquid 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 liquid 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 system pressure is balanced, thereby realizing the coordinated control of low active force and damping adjustment;

[0071] 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 liquid 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 liquid 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 system pressure balance is reached, thereby realizing the coordinated control of low active force and damping adjustment.

[0072] like Figure 3 As shown, the high active power working mode according to the embodiment of the present application is:

[0073] The suspension controller analyzes the collected signals and determines that the system should be in high active power working mode.

[0074] In the high 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.

[0075] 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, pushing the piston 3 to move downward. The liquid in the second chamber 4 of the hydraulic cylinder 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 system pressure pulsation until the system pressure is balanced, thereby achieving high-active power regulation;

[0076] 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 liquid in the first chamber 2 of the hydraulic cylinder 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, reduce the system pressure pulsation, until the system pressure balance is reached, thereby realizing high-active power regulation.

[0077] In summary, the hydraulic suspension system 100 according to the present invention is provided with a power module and a first energy storage module 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 system has sufficient energy, so that the hydraulic suspension system 100 has higher conversion efficiency and faster regulation rate, higher system working efficiency, and a larger main power regulation range.

[0078] 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 invention. 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 appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0079] While embodiments of the present invention have been shown and described above, alterations, modifications, substitutions, and variations of the embodiments described above are possible.

Claims

1. A hydraulic suspension system, characterized in that: include: A hydraulic cylinder, wherein a piston (3) is movably provided in the hydraulic cylinder, and the piston (3) divides the interior of the hydraulic cylinder into a first cavity (2) and a second cavity (4); A power module, the power module 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 being adapted to drive a medium to flow from the first interface (a) toward the second interface (b) or to drive a medium to flow from the second interface (b) toward the first interface (a); A first energy storage module, the first energy storage module having a first energy storage chamber and a second energy storage chamber, the first energy storage chamber being selectively connected to the first cavity (2), and the second energy storage chamber being selectively connected to the second cavity (4); 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 chamber (2) and the first energy storage chamber, respectively; and / or a second valve body (10), the second valve body (10) having 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; a second energy storage module, the second energy storage module having 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; 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.

2. The hydraulic suspension system according to claim 1, characterized in that: The first energy storage module includes: 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); 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 high active force adjustment mode. When the hydraulic suspension system is in the high active force 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).

3. The hydraulic suspension system according to claim 1, characterized in that: 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), so that the third energy storage chamber is connected to the first cavity (2) and the second cavity (4) at the same time.

4. The hydraulic suspension system according to claim 3, characterized in that: The second energy storage module includes: a third accumulator (20), the third accumulator (20) having the third accumulator chamber; a first valve group, wherein the first valve group is formed with a first energy storage interface and a third interface communicating with the first energy storage interface, the first energy storage interface being in communication with the fifth valve port (g), and the third interface being in communication with the third energy storage chamber, and the first valve group being capable of selectively directing a medium to flow from the first energy storage interface toward the third interface or from the third interface toward the first energy storage interface; a second valve group, wherein a second energy storage interface and a fourth interface communicating with the second energy storage interface are formed on the second valve group, the second energy storage interface is communicated with the seventh valve port (i), and the fourth interface is communicated with the third energy storage chamber, and the second valve group can selectively guide the medium to flow from the second energy storage interface toward the fourth interface or guide the medium to flow from the fourth interface toward the second energy storage interface; The hydraulic suspension system has a low active force adjustment mode. When the hydraulic suspension system is in the low active force 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).

5. The hydraulic suspension system according to claim 4, characterized in that: The first valve group includes: a first damping valve (19), wherein the first damping valve (19) has a fifth port and the third port; a first one-way valve (16), the first one-way valve (16) having an inlet and an outlet, the inlet of the first one-way valve (16) being in communication with the first energy storage interface, and the outlet of the first one-way valve (16) being in communication with the fifth interface; A second one-way valve (15), wherein the second one-way valve (15) has an inlet and an outlet, the inlet of the second one-way valve (15) is communicated with the third interface, and the outlet of the second one-way valve (15) is communicated with the first energy storage interface.

6. The hydraulic suspension system according to claim 4, characterized in that: The second valve group includes: a second damping valve (21), the second damping valve (21) having a sixth interface and the fourth interface; a third one-way valve (18), the third one-way valve (18) having an inlet and an outlet, the inlet of the third one-way valve (18) being in communication with the second energy storage interface, and the outlet of the third one-way valve (18) being in communication with the sixth interface; A fourth one-way valve (17), the fourth one-way valve (17) having an inlet and an outlet, the inlet of the fourth one-way valve (17) being in communication with the fourth interface, and the outlet of the fourth one-way valve (17) being in communication with the second energy storage interface.

7. The hydraulic suspension system according to any one of claims 1 to 6, characterized in that: The power module includes: 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 adapted to selectively drive a medium to flow from the first interface (a) toward the second interface (b) or to drive a medium to flow from the second interface (b) toward the first interface (a); A bidirectional drive motor (8) having a drive end connected to the bidirectional hydraulic pump (7).

8. The hydraulic suspension system according to claim 7, characterized in that: Also includes: 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 in communication with the first interface (a), and the tenth valve port (L) being in communication with the first cavity (2); and / 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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