Hydraulic suspension system and method of controlling the same

Abstract

The application discloses a hydraulic suspension system and a control method thereof, and the hydraulic suspension system comprises a hydraulic cylinder, a power module, an energy storage module and a valve body. A piston is movably arranged in the hydraulic cylinder, and the piston separates the hydraulic cylinder into a first cavity and a second cavity, and the first cavity and the second cavity store medium; the power module is provided with a first interface communicated with the first cavity and a second interface communicated with the second cavity; the energy storage module is provided with a first energy storage interface and a second energy storage interface; the valve body comprises a first valve body and / or a second valve body, a first valve port of the first valve body is respectively communicated with the first cavity and the first interface, a second valve port is communicated with the first energy storage interface; a third valve port of the second valve body is respectively communicated with the second cavity and the second interface, and a fourth valve port is communicated with the second energy storage interface. The hydraulic suspension system designed according to the application can realize higher conversion efficiency and faster adjustment speed, and output a larger active force adjustment range.

Description

Technical Field

[0001] This invention relates to the field of hydraulic suspension systems, and in particular to a hydraulic suspension system and its control method. Background Technology

[0002] In related technologies, vehicles are equipped with hydraulic suspension systems to provide power and reduce vibrations caused by uneven road surfaces. To ensure the effectiveness of the hydraulic suspension system in providing power, some existing hydraulic suspension systems connect the hydraulic pump and damping valve in series. The oil flows through the damping valve, which requires a certain opening pressure to open. This causes back pressure to form at the other end of the hydraulic pump. At this time, the system runs idle and burns out the motor due to insufficient return oil replenishment capacity. Furthermore, the opening pressure required for the damping valve to open results in a slow system pressure adjustment speed. In other existing hydraulic suspension systems, the hydraulic pump and damping valve are connected in parallel to form two independent closed loops. However, in this system, high-pressure oil leaks through the damping valve, resulting in energy loss and low system efficiency. At the same time, due to the flow diversion of the damping valve, the flow rate supplied by the hydraulic pump to the working cylinder is reduced, affecting the adjustment speed of the hydraulic suspension system. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one object of this invention is to provide a hydraulic suspension system. The hydraulic suspension system designed according to this invention can achieve higher conversion efficiency and faster adjustment rate, and output a wider range of active force adjustment.

[0004] The present invention also proposes a control method for the above-mentioned hydraulic suspension system.

[0005] The hydraulic suspension system according to the present invention includes: a hydraulic cylinder, wherein a piston is movably disposed within the hydraulic cylinder, the piston dividing the interior of the hydraulic cylinder into a first cavity and a second cavity, both the first cavity and the second cavity storing a medium; a power module having a first interface and a second interface, the first interface communicating with the first cavity and the second interface communicating with the second cavity, the power module being adapted 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; an energy storage module having a first energy storage interface and a second energy storage interface, the energy storage module being adapted to store or release a medium; and a valve body comprising: a first valve body having a first valve port and a second valve port selectively connected to each other, the first valve port communicating with the first cavity and the first interface respectively, and the second valve port communicating with the first energy storage interface; and / or a second valve body having a third valve port and a fourth valve port selectively connected to each other, the third valve port communicating with the second cavity and the second interface respectively, and the fourth valve port communicating with the second energy storage interface.

[0006] The hydraulic suspension system according to the present invention connects the energy storage module in parallel with the hydraulic cylinder, and the energy storage module can be selectively connected to the oil circuit through the first energy storage interface and / or the second energy storage interface via the first valve body and / or the second valve body. This can avoid diversion by other structures or valve bodies, improve the system working efficiency, and enable the system to output greater active force and achieve a faster adjustment rate.

[0007] According to some embodiments of the present invention, the energy storage module includes: an energy storage unit having an energy storage chamber storing a medium; a first valve group having a first energy storage interface and a third interface communicating with the first energy storage interface, the third interface communicating with the 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; and a second valve group having a second energy storage interface and a fourth interface communicating with the second energy storage interface, the fourth interface communicating with the energy storage chamber, the second valve group selectively guiding the medium to flow from the second energy storage interface toward the fourth interface or guiding the medium to flow from the fourth interface toward the second energy storage interface.

[0008] According to some embodiments of the present invention, the first valve assembly includes: a first damping valve having a fifth port and the third port; a first check valve having an inlet and an outlet, the inlet of the first check valve communicating with the first energy storage port, and the outlet of the first check valve communicating with the fifth port; and a second check valve having an inlet and an outlet, the inlet of the second check valve communicating with the third port, and the outlet of the second check valve communicating with the first energy storage port.

[0009] According to some embodiments of the present invention, the second valve assembly includes: a second damping valve having a sixth port and the fourth port; a third check valve having an inlet and an outlet, the inlet of the third check valve communicating with the second energy storage port, and the outlet of the third check valve communicating with the sixth port; and a fourth check valve having an inlet and an outlet, the inlet of the fourth check valve communicating with the fourth port, and the outlet of the fourth check valve communicating with the second energy storage port.

[0010] According to some embodiments of the present invention, the power module includes: a bidirectional hydraulic pump having a first interface and a second interface, the first interface being selectively connected to a first cavity, and / or the second interface being selectively connected to a second cavity, the bidirectional hydraulic pump being adapted to selectively drive a medium to flow from the first interface toward the second interface or to drive a medium to flow from the second interface toward the first interface; and a bidirectional drive motor having a drive end connected to the bidirectional hydraulic pump.

[0011] According to some embodiments of the present invention, the power module includes: a third valve body, the third valve body being disposed between the first interface and the first cavity and selectively connecting the first interface and the first cavity.

[0012] The following is a brief description of a control method for a hydraulic suspension system according to another embodiment of the present invention, wherein the hydraulic suspension system is constructed as described in any of the above embodiments.

[0013] The control method for a hydraulic suspension system according to the present invention includes: S1, acquiring a suspension control signal; S2, controlling the hydraulic suspension system to switch to a high-active mode according to the suspension control signal; S3, the hydraulic suspension system controlling one of the first valve body and the second valve body to be turned on and the other of the first valve body and the second valve body to be turned off in the high-active mode; S4, starting the power module, wherein the power module drives the medium to flow from the first interface to the second interface or the drive medium flows from the second interface to the first interface.

[0014] According to some embodiments of the present invention, the hydraulic suspension system controlling one of the first valve body and the second valve body to be turned on and the other of the first valve body and the second valve body to be turned off in the high active mode includes: S31, determining that a tire jump operation needs to be performed according to the suspension control signal, and controlling the second valve body to be turned on and the first valve body to be turned off; the step of starting the power module, and the power module driving medium flowing from the first interface to the second interface or the driving medium flowing from the second interface to the first interface includes: S41, starting the power module, and the power module driving medium flowing from the second interface to the first interface.

[0015] According to some embodiments of the present invention, in the high active mode, the hydraulic suspension system controls one of the first valve body and the second valve body to be turned on and the other of the first valve body and the second valve body to be turned off, including: S32, determining that a tire compression operation needs to be performed according to the suspension control signal, and controlling the first valve body to be turned on and the second valve body to be turned off; the step of starting the power module, and the power module driving medium flowing from the first interface to the second interface or the driving medium flowing from the second interface to the first interface, includes: S42, starting the power module, and the power module driving medium flowing from the first interface to the second interface.

[0016] According to some embodiments of the present invention, the acquisition of suspension control signals includes: S11, obtaining the suspension control signals based on one or more of the following: road surface signal, driving mode signal, suspension acceleration signal, suspension displacement signal, vehicle body acceleration signal, vehicle speed signal, steering wheel angle signal, and battery charge signal; the suspension control signals include high active mode, low active mode, and passive mode.

[0017] According to some embodiments of the present invention, the control method further includes: S2', controlling the suspension system to switch to a low active mode according to the suspension control signal; S3', the hydraulic suspension system controlling the first valve body and the second valve body to conduct in the low active mode; S4', starting the power module, wherein the power module drives the medium to flow from the first interface to the second interface or the driving medium flows from the second interface to the first interface.

[0018] According to some embodiments of the present invention, the control method for a hydraulic suspension system further includes: S2”, controlling the suspension system to switch to passive mode according to the suspension control signal; S3”, the hydraulic suspension system controlling the first valve body and the second valve body to be turned on and controlling the power module to be turned off in the passive mode.

[0019] In summary, the hydraulic suspension system according to the present invention connects the energy storage module in parallel with the hydraulic cylinder, and the energy storage module can be selectively connected to the oil circuit through the first energy storage interface and / or the second energy storage interface via the first valve body and / or the second valve body. This avoids diversion by other structures or valve bodies, enabling the hydraulic suspension system to have higher conversion efficiency and faster adjustment rate, higher system working efficiency, and a wider range of active power adjustment.

[0020] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0022] Figure 1 This is an example diagram of the passive mode of a hydraulic suspension system according to an embodiment of the present invention.

[0023] Figure 2 This is an example diagram of a hydraulic suspension system in low active mode according to an embodiment of the present invention.

[0024] Figure 3 This is an example diagram of a hydraulic suspension system performing a high-active mode of tire bounce according to an embodiment of the present invention.

[0025] Figure 4 This is an example diagram of a hydraulic suspension system performing a high-active mode of tire compression according to an embodiment of the present invention.

[0026] Figure 5 This is a schematic flowchart of a hydraulic suspension system control method according to an embodiment of the present invention.

[0027] Figure label:

[0028] 100. Hydraulic suspension system;

[0029] 2. First cavity; 4. Second cavity; 3. Piston;

[0030] 5. Third valve body;

[0031] 6. Two-way hydraulic pump; a. First interface; b. Second interface;

[0032] 7. Bidirectional drive motor;

[0033] 15. Accumulator;

[0034] 14. First damping valve; i. Third port; k. Fifth port;

[0035] 11. First check valve; 10. Second check valve;

[0036] c. First energy storage interface;

[0037] 16. Second damping valve; j. Fourth port; L. Sixth port;

[0038] 13. Third check valve; 12. Fourth check valve;

[0039] d. Second energy storage interface;

[0040] 8. First valve body; e. First valve port; f. Second valve port;

[0041] 9. Second valve body; g. Third valve port; h. Fourth valve port. Detailed Implementation

[0042] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0043] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0044] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0045] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0046] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0047] In related technologies, vehicles are equipped with hydraulic suspension systems to provide power and reduce vibrations caused by uneven road surfaces. To ensure the effectiveness of the hydraulic suspension system in providing power, some existing hydraulic suspension systems connect the hydraulic pump and damping valve in series. The oil flows through the damping valve, which requires a certain opening pressure to open. This causes back pressure to form at the other end of the hydraulic pump. At this time, the system runs idle and burns out the motor due to insufficient return oil replenishment capacity. Furthermore, the opening pressure required for the damping valve to open results in a slow system pressure adjustment speed. In other existing hydraulic suspension systems, the hydraulic pump and damping valve are connected in parallel to form two independent closed loops. However, in this system, high-pressure oil leaks through the damping valve, resulting in energy loss and low system efficiency. At the same time, due to the flow diversion of the damping valve, the flow rate supplied by the hydraulic pump to the working cylinder is reduced, affecting the adjustment speed of the hydraulic suspension system.

[0048] The following is for reference. Figures 1-4 A hydraulic suspension system 100 according to an embodiment of the present invention is described.

[0049] like Figures 1-4As shown, the hydraulic suspension system 100 according to the present invention includes: a hydraulic cylinder, a power module, an energy storage module, and a valve body. A piston 3 is movably disposed inside the hydraulic cylinder, dividing the interior of the hydraulic cylinder into a first chamber 2 and a second chamber 4. Both the first chamber 2 and the second chamber 4 store a medium. The power module has a first interface a and a second interface b. The first interface a is connected to the first chamber 2, and the second interface b is connected to the second chamber 4. The power module is adapted to drive the medium to flow from the first interface a to the second interface b or to drive the medium to flow from the second interface b to the first interface a. The energy storage module has a first energy storage interface c and a second energy storage interface d. The energy storage module is adapted to store or release a medium. The valve body includes a first valve body 8 and / or a second valve body 9. The first valve body 8 has a first valve port e and a second valve port f that are selectively connected to each other. The first valve port e is connected to the first chamber 2 and the first interface a, respectively, and the second valve port f is connected to the first energy storage interface c. The second valve body 9 has a third valve port g and a fourth valve port h that are selectively connected to each other. The third valve port g is connected to the second chamber 4 and the second interface b, respectively, and the fourth valve port h is connected to the second energy storage interface d. Since piston rod 3 occupies the space of the first chamber 2, the change in the medium within the first chamber 2 is less than the change in the medium within the second chamber 4 when piston 3 moves. In the hydraulic suspension system 100's oil circuit, the energy storage module and power module can participate in pressure regulation. The first valve body 8 can connect the first energy storage interface c of the energy storage module to the oil circuit, at which point the energy storage module can connect to the first chamber 2 through the first energy storage interface c. Conversely, the second valve body 9 can connect the second energy storage interface d of the energy storage module to the oil circuit, at which point the energy storage module can connect to the second chamber 4 through the second energy storage interface d.

[0050] 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 into the second cavity 4. At this time, the piston 3 moves upward. The amount of medium flowing out of the first cavity 2 is less than the amount of medium required by the second cavity 4. That is, the amount of medium flowing out of the first cavity 2 is insufficient to meet the amount of medium required by the second cavity 4. Therefore, the energy storage module can be connected to the oil circuit through the first energy storage interface c or the second energy storage interface d to replenish the medium in the oil circuit. At this time, the energy storage module is used to replenish the medium in the system to reduce system pressure pulsation until the system pressure balance is achieved. Under the action of the power module, The medium can also flow from the second chamber 4 through the power module and into the first chamber 2. At this time, the piston 3 moves downward, and the amount of medium flowing out of the second chamber 4 is more than the amount of medium required by the first chamber 2. That is, the amount of medium flowing out of the second chamber 4 is more than the amount required by the first chamber 2. Therefore, the energy storage module can be connected to the oil circuit through the first energy storage interface c or the second energy storage interface d to store the excess medium that cannot enter the first chamber 2. At this time, the energy storage module is used to store the 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.

[0051] It is worth mentioning that the power module drive medium flows from the first cavity 2 through the power module and into the second cavity 4 to make the piston 3 move upward. At this time, the hydraulic suspension system 100 executes the command to press the tire down or move the vehicle body upward. The power module drive medium flows from the second cavity 4 through the power module and into the first cavity 2 to make the piston 3 move downward. At this time, the hydraulic suspension system 100 executes the command to jump the tire or move the vehicle body downward.

[0052] The hydraulic suspension system 100 according to the present invention connects the energy storage module in parallel with the hydraulic cylinder, and the energy storage module can be selectively connected to the oil circuit through the first energy storage interface c and / or the second energy storage interface d via the first valve body 8 and / or the second valve body 9. This can avoid diversion by other structures or valve bodies, improve the system working efficiency, and enable the system to output greater active force and achieve a faster adjustment rate.

[0053] According to some embodiments of the present invention, such as Figures 1-4As shown, the energy storage module includes an energy storage unit 15, a first valve group, and a second valve group. The energy storage unit 15 has an energy storage chamber containing a medium. The first valve group has a first energy storage interface c and a third interface i that is connected to the first energy storage interface c. The third interface i is connected to the energy storage chamber. The first valve group can selectively guide the medium to flow from the first energy storage interface c toward the third interface i or guide the medium to flow from the third interface i toward the first energy storage interface c. The second valve group has a second energy storage interface d and a fourth interface j that is connected to the second energy storage interface d. The fourth interface j is connected to the energy storage chamber. The second valve group can selectively guide the medium to flow from the second energy storage interface d toward the fourth interface j or guide the medium to flow from the fourth interface j toward the second energy storage interface d. When the first valve port e and the second valve port f of the first valve body 8 are open, the accumulator 15 is connected to the oil circuit through the first valve group. When the third valve port g and the fourth valve port h of the second valve body 9 are open, the accumulator 15 is connected to the oil circuit through the second valve group. This allows for selective replenishment of the medium to the second chamber 4 or storage of excess medium in the oil circuit. The system can store and replenish oil as needed, thereby reducing pressure fluctuations in the system.

[0054] According to some embodiments of the present invention, such as Figures 1-4 As shown, the first valve group includes a first damping valve 14, a first check valve 11, and a second check valve 10. The first damping valve 14 has a fifth port k and a third port i. The first check valve 11 has an inlet and an outlet. The inlet of the first check valve 11 is connected to the first energy storage port c, and the outlet of the first check valve 11 is connected to the fifth port k. The second check valve 10 has an inlet and an outlet. The inlet of the second check valve 10 is connected to the third port i, and the outlet of the second check valve 10 is connected to the first energy storage port c. When the first valve port e and the second valve port f of the first valve body 8 are open, the accumulator 15 is connected to the oil circuit through the first valve group. The medium can flow through the first energy storage port c, through the first check valve 11 and the first damping valve 14, and through the third port i to the accumulator 15. The medium can also flow through the third port i, through the second check valve 10, and through the first energy storage port c to the first valve body 8, so as to selectively replenish the medium to the oil circuit or store the excess medium in the oil circuit, thereby attenuating the pressure fluctuation of the system.

[0055] According to some embodiments of the present invention, such as Figures 1-4As shown, the second valve group includes a second damping valve 16, a third check valve 13, and a fourth check valve 12. The second damping valve 16 has a sixth port L and a fourth port j. The third check valve 13 has an inlet and an outlet. The inlet of the third check valve 13 is connected to the second accumulator port d, and the outlet of the third check valve 13 is connected to the sixth port L. The fourth check valve 12 has an inlet and an outlet. The inlet of the fourth check valve 12 is connected to the fourth port j, and the outlet of the fourth check valve 12 is connected to the second accumulator port d. When the third valve port g and the fourth valve port h of the second valve body 9 are open, the accumulator 15 is connected to the oil circuit through the second valve group. The medium can flow through the second accumulator port d, through the third check valve 13 and the second damping valve 16, and through the fourth port j to the accumulator 15. The medium can also flow through the fourth port j, through the fourth check valve 12, and through the second accumulator port d to the second valve body 9, so as to selectively replenish the medium to the oil circuit or store the excess medium in the oil circuit, thereby attenuating the pressure fluctuation of the system.

[0056] According to some embodiments of the present invention, such as Figures 1-4 As shown, the power module includes a bidirectional hydraulic pump 6 and a bidirectional drive motor 7. The bidirectional hydraulic pump 6 has a first interface a and a second interface b. The first interface a can be selectively connected to a first cavity 2, and / or the second interface b can be selectively connected to a second cavity 4. The bidirectional hydraulic pump 6 is adapted to selectively drive the medium to flow from the first interface a to the second interface b or drive the medium to flow from the second interface b to the first interface a. The bidirectional drive motor 7 has a drive end, which is connected to the bidirectional hydraulic pump 6. The bidirectional hydraulic pump 6 and the bidirectional drive motor 7 are electrically connected. Driven by the bidirectional drive motor 7, the bidirectional hydraulic pump 6 can pump the medium bidirectionally, 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, such as Figures 1-4 As shown, the power module includes a third valve body 5, which is located between the first interface a and the first cavity 2 and can selectively connect the first interface a and the first cavity 2. The third valve body 5 can selectively connect the bidirectional hydraulic pump 6 to the oil circuit, so that the hydraulic suspension system 100 can switch between active and passive adjustment, thus enriching the functions of the hydraulic suspension system 100.

[0058] This application achieves rapid switching between multiple operating states through the design of a first valve body 8, a second valve body 9, and a third valve body 5, with each mode controlled independently and without interference. Compared with existing technologies, the high-active mode of this system achieves higher conversion efficiency and faster adjustment rate, outputting a wider range of active force adjustment. This enables the hydraulic suspension system 100 to not only achieve basic functions such as vertical control, roll and pitch stabilization, but also to enable the vehicle equipped with this system to achieve advanced functions such as three-wheel driving, stationary jump, and assisted escape from difficult situations. In low-to-medium frequency road conditions, the low-active mode is switched to coordinate the adjustment of active force and damping force, thereby ensuring the vehicle achieves ultimate handling and absolute stability. In high-frequency road conditions, the passive mode is switched to adjust damping, saving vehicle power and balancing economy, comfort, and handling stability.

[0059] The control method for a hydraulic suspension system according to the present invention is briefly described below, wherein the hydraulic suspension system is constructed as described in any of the above embodiments.

[0060] like Figure 5 As shown, the control method for a hydraulic suspension system according to the present invention includes:

[0061] S1. Obtain suspension control signals;

[0062] S2. Control the hydraulic suspension system to switch to high active mode according to the suspension control signal;

[0063] S3. In the high active mode, the hydraulic suspension system controls one of the first valve body and the second valve body to be turned on and the other of the first valve body and the second valve body to be turned off.

[0064] S4. Start the power module, and the power module driving medium flows from the first interface to the second interface or from the second interface to the first interface.

[0065] Here, the hydraulic suspension system has a suspension controller. The suspension controller collects and analyzes signals to obtain suspension control signals. Based on the suspension control signals, the suspension controller can switch the system to a high active mode. In the high active mode, the suspension controller controls one of the first valve body and the second valve body to be open, while the other of the first valve body and the second valve body is closed, so that the accumulator is connected to the oil circuit only through the first energy storage interface or the second energy storage interface. When the suspension controller determines that tire compression is required, the first valve body opens, and the accumulator connects to the oil circuit through the first energy storage interface. At this time, the piston moves upward, the liquid in the first chamber is compressed and flows from the power module to the second chamber. Since the amount of medium flowing into the second chamber is less than the amount flowing out of the first chamber, the accumulator needs to replenish the medium to the oil circuit through the first energy storage interface. When the suspension controller determines that tire bounce is required, the second valve body opens, and the accumulator connects to the oil circuit through the second energy storage interface. At this time, the piston moves downward, the liquid in the second chamber is compressed and flows from the power module to the first chamber. Since the amount of medium flowing into the first chamber is excessive, the accumulator needs to store the excess medium in the oil circuit through the second energy storage interface. The energy storage module is used to reduce system pressure pulsations until system pressure balance is achieved, thereby realizing high-power regulation.

[0066] According to some embodiments of the present invention, in the high active mode, controlling one of the first valve body and the second valve body to be open and the other of the first valve body and the second valve body to be closed includes:

[0067] S31. Based on the suspension control signal, if a tire jump operation needs to be performed, control the second valve body to open and the first valve body to close.

[0068] The step of activating the power module, wherein the power module driving medium flows from the first interface to the second interface or from the second interface to the first interface, includes:

[0069] S41. Start the power module, and the power module drive medium flows from the second interface to the first interface.

[0070] Here, when the suspension controller determines that the tires need to bounce or the vehicle body needs to move downward, the bidirectional drive motor drives the bidirectional hydraulic pump to work. High-pressure oil flows through the third valve body and pushes the piston downward. The liquid in the second chamber of the hydraulic cylinder is squeezed and flows back to the bidirectional hydraulic pump. The accumulator is used to store the system oil, reduce system pressure pulsation, until the system pressure balance is reached, thereby realizing high active force regulation.

[0071] According to some embodiments of the present invention, in the high active mode, controlling one of the first valve body and the second valve body to be open and the other of the first valve body and the second valve body to be closed includes:

[0072] S32. Based on the suspension control signal, if a tire compression operation needs to be performed, control the first valve body to open and the second valve body to close.

[0073] The step of activating the power module, wherein the power module driving medium flows from the first interface to the second interface or from the second interface to the first interface, includes:

[0074] S42. Start the power module, and the power module drive medium flows from the first interface to the second interface.

[0075] Here, when the suspension controller determines that the tires need to be pressed down or the vehicle body needs to be moved up, the bidirectional drive motor drives the bidirectional hydraulic pump to work. The high-pressure oil pushes the piston to move upward, and the liquid in the first chamber of the hydraulic cylinder is squeezed, flows through the third valve body, and flows back into the bidirectional hydraulic pump. The accumulator is used to replenish the system oil, reduce system pressure pulsation, until the system pressure balance is reached, thereby realizing high active force regulation.

[0076] According to some embodiments of the present invention, acquiring the suspension control signal includes:

[0077] S11. The suspension control signal is obtained based on one or more of the following: road surface signal, driving mode signal, suspension acceleration signal, suspension displacement signal, vehicle body acceleration signal, vehicle speed signal, steering wheel angle signal, and battery charge signal; the suspension control signal includes high active mode, low active mode, and passive mode.

[0078] Here, the operating mode of the hydraulic suspension system is controlled by the suspension controller. Suspension control signals are obtained by collecting road surface signals, driving mode signals (for vehicles with driving mode selection), suspension acceleration signals, suspension displacement signals, vehicle acceleration signals, vehicle speed signals, steering wheel angle signals, and battery charge signals. These signals allow the suspension controller to determine whether the hydraulic suspension system operates in high-active, low-active, or passive mode. Furthermore, the first, second, and third valve bodies are all two-position, two-way valves. The first, second, and third valve bodies, as well as the first and second damping valves in the hydraulic suspension system, which are controlled by current signals, are all controlled by the suspension controller.

[0079] This application enables the hydraulic suspension system to quickly switch between multiple operating modes by setting up an accumulator, multiple valve bodies, multiple damping valves, and multiple check valves, achieving independent control of passive mode, low active mode, and high active mode without affecting each other.

[0080] like Figures 3-4 As shown, the high-activity mode according to an embodiment of this application is:

[0081] The suspension controller analyzes the collected signals to determine whether the system should be in a highly active mode.

[0082] In high-active mode, when the suspension controller determines that tire bounce or vehicle body downward movement is required, the suspension controller controls the second and third valve bodies to be in the conducting state, while the first valve body is in the disconnected state. At this time, the bidirectional drive motor and accumulator are connected to the oil circuit. The bidirectional drive motor drives the bidirectional hydraulic pump to work, and high-pressure oil flows through the third valve body and pushes the piston downward. The liquid in the second chamber of the hydraulic cylinder is squeezed and flows back to the bidirectional hydraulic pump. The accumulator is used to store system oil, reduce system pressure pulsation, until system pressure balance is reached, thereby achieving high-active force regulation.

[0083] In high-active mode, when the suspension controller determines that tire compression or vehicle body upward movement is required, the controller activates the first and third valve bodies while deactivating the second valve body. At this time, the bidirectional drive motor and accumulator are connected to the hydraulic circuit. The bidirectional drive motor drives the bidirectional hydraulic pump, and the high-pressure oil pushes the piston upward. The fluid in the first chamber of the hydraulic cylinder is compressed, flows through the third valve body, and returns to the bidirectional hydraulic pump. The accumulator replenishes the system fluid, reducing system pressure pulsations until system pressure balance is achieved, thus realizing high-active force regulation.

[0084] According to some embodiments of the present invention, the control method further includes:

[0085] S2' Control the suspension system to switch to low active mode according to the suspension control signal;

[0086] S3' The hydraulic suspension system controls the first valve body and the second valve body to be open in the low active mode;

[0087] S4' Start the power module, and the power module drive medium flows from the first interface to the second interface or from the second interface to the first interface.

[0088] Here, as Figure 2 As shown, the low-power operating mode according to an embodiment of this application is as follows:

[0089] The suspension controller analyzes the collected signals to determine whether the system should be in a low-power operating mode.

[0090] In low-power operation mode, the suspension controller controls the first valve body, the second valve body, and the third valve body to be in the conducting state. At this time, the bidirectional drive motor and the accumulator are connected to the oil circuit.

[0091] When the suspension controller determines that the tires need to bounce or the vehicle body needs to move downward, the bidirectional drive motor drives the bidirectional hydraulic pump to work. High-pressure oil flows through the third valve body and pushes the piston downward. The liquid in the second chamber is squeezed and flows back to the bidirectional hydraulic pump. The excess liquid flows through the first valve body into the accumulator until the system pressure balance is reached, thereby realizing the coordinated control of low active force and damping adjustment.

[0092] When the suspension controller determines that the tires need to be depressed or the vehicle body needs to be moved upward, the bidirectional drive motor drives the bidirectional hydraulic pump to work. High-pressure oil enters the second chamber and pushes the piston upward. The liquid in the first chamber is squeezed, flows through the third valve body, and flows back into the bidirectional hydraulic pump. The excess liquid flows through the second valve body and, under the action of the liquid pressure in the accumulator, flows through the first valve body to replenish the bidirectional hydraulic pump until the system pressure balance is achieved, thereby realizing the coordinated control of low active force and damping adjustment.

[0093] According to some embodiments of the present invention, the control method for a hydraulic suspension system further includes:

[0094] S2”, Control the suspension system to switch to passive mode according to the suspension control signal;

[0095] S3”, the hydraulic suspension system controls the first valve body and the second valve body to conduct in the passive mode and controls the power module to shut down.

[0096] Here, as Figure 1 As shown, the passive mode according to an embodiment of this application is:

[0097] The suspension controller analyzes the collected signals to determine whether the system should be in passive mode;

[0098] In passive mode, the suspension controller controls the first valve body and the second valve body to be in the conducting state, and the first valve body to be in the disconnected state. At this time, the accumulator is connected to the oil circuit, and the bidirectional drive motor is not connected to the oil circuit.

[0099] When the tires bounce up or the vehicle body moves down, the liquid in the second chamber is squeezed and flows through the second valve body, the third check valve, and the second damping valve. Here, the opening of the second damping valve can be adjusted by changing the input current. The damping force of the second damping valve can be adjusted in passive adjustment mode. Part of the medium enters the accumulator, and the other part of the medium flows through the second check valve into the first chamber.

[0100] When the tire is pressed down or the vehicle body moves upward, the liquid in the first chamber is squeezed and flows through the first valve body, the first check valve, and the first damping valve. Here, by changing the magnitude of the input current to adjust the opening of the first damping valve, the damping force in the passive adjustment mode can be adjusted. The accumulator replenishes the medium to the oil circuit. The replenished medium and the medium flowing through the first damping valve enter the second chamber through the fourth check valve and the second valve body.

[0101] In summary, the hydraulic suspension system according to the present invention connects the energy storage module in parallel with the hydraulic cylinder, and the energy storage module can be selectively connected to the oil circuit through the first energy storage interface and / or the second energy storage interface via the first valve body and / or the second valve body. This avoids diversion by other structures or valve bodies, enabling the hydraulic suspension system to have higher conversion efficiency and faster adjustment rate, higher system working efficiency, and a wider range of active power adjustment.

[0102] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0103] Although embodiments of the present invention have been shown and described above, variations, modifications, substitutions and alterations can be made to the above embodiments.

Claims

1. A control method for a hydraulic suspension system, characterized in that, The hydraulic suspension system includes: a hydraulic cylinder, in which a piston (3) is movably disposed, the piston (3) dividing the interior of the hydraulic cylinder into a first cavity (2) and a second cavity (4), both the first cavity (2) and the second cavity (4) storing a medium; a power module, the power module having a first interface (a) and a second interface (b), the first interface (a) communicating with the first cavity (2), the second interface (b) communicating with the second cavity (4), the power module being adapted to 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 an energy storage module, the energy storage module having a first energy storage interface (c). The control method includes: a first valve body (8) having a first valve port (e) and a second valve port (f) that are selectively connected to each other, the first valve port (e) being connected to the first cavity (2) and the first interface (a) respectively, and the second valve port (f) being connected to the first energy storage interface (c); and / or a second valve body (9) having a third valve port (g) and a fourth valve port (h) that are selectively connected to each other, the third valve port (g) being connected to the second cavity (4) and the second interface (b) respectively, and the fourth valve port (h) being connected to the second energy storage interface (d). S1. Obtain suspension control signals; S2. Control the hydraulic suspension system to switch to high active mode according to the suspension control signal; S3. In the high active mode, the hydraulic suspension system controls one of the first valve body and the second valve body to be turned on and the other of the first valve body and the second valve body to be turned off. S4. Start the power module, and the power module driving medium flows from the first interface to the second interface or from the second interface to the first interface.

2. The control method for a hydraulic suspension system according to claim 1, characterized in that, The hydraulic suspension system, in the high active mode, controls the opening of one of the first valve body and the second valve body, and the closing of the other of the first valve body and the second valve body, including: S31. Based on the suspension control signal, if a tire jump operation needs to be performed, control the second valve body to open and the first valve body to close. The step of activating the power module, wherein the power module driving medium flows from the first interface to the second interface or from the second interface to the first interface, includes: S41. Start the power module, and the power module drive medium flows from the second interface to the first interface.

3. The control method for a hydraulic suspension system according to claim 1, characterized in that, The hydraulic suspension system, in the high active mode, controls the opening of one of the first valve body and the second valve body, and the closing of the other of the first valve body and the second valve body, including: S32. Based on the suspension control signal, if a tire compression operation needs to be performed, control the first valve body to open and the second valve body to close. The step of activating the power module, wherein the power module driving medium flows from the first interface to the second interface or from the second interface to the first interface, includes: S42. Start the power module, and the power module drive medium flows from the first interface to the second interface.

4. The control method for a hydraulic suspension system according to claim 1, characterized in that, The acquisition of suspension control signals includes: S11. The suspension control signal is obtained based on one or more of the following: road surface signal, driving mode signal, suspension acceleration signal, suspension displacement signal, vehicle body acceleration signal, vehicle speed signal, steering wheel angle signal, and battery charge signal; the suspension control signal includes high active mode, low active mode, and passive mode.

5. The control method for a hydraulic suspension system according to claim 4, characterized in that, The control method further includes: S2' Control the suspension system to switch to low active mode according to the suspension control signal; S3' The hydraulic suspension system controls the first valve body and the second valve body to be open in the low active mode; S4' Start the power module, and the power module drive medium flows from the first interface to the second interface or from the second interface to the first interface.

6. The control method for a hydraulic suspension system according to claim 4, characterized in that, Also includes: S2”, Control the suspension system to switch to passive mode according to the suspension control signal; S3”, the hydraulic suspension system controls the first valve body and the second valve body to conduct in the passive mode and controls the power module to shut down.

7. A hydraulic suspension system, characterized in that, The hydraulic suspension system is used to implement the control method for a hydraulic suspension system as described in any one of claims 1-6, the hydraulic suspension system comprising: A hydraulic cylinder, wherein a piston (3) is movably disposed inside the hydraulic cylinder, the piston (3) dividing the interior of the hydraulic cylinder into a first cavity (2) and a second cavity (4), both the first cavity (2) and the second cavity (4) storing a medium; A power module having a first interface (a) and a second interface (b), the first interface (a) being connected to the first cavity (2), and the second interface (b) being connected to the second cavity (4), the power module being adapted to 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); An energy storage module having a first energy storage interface (c) and a second energy storage interface (d), the energy storage module being adapted to store or release a medium; Valve body, the valve body comprising: A first valve body (8) has a first valve port (e) and a second valve port (f) that are selectively connected to each other. The first valve port (e) is connected to the first cavity (2) and the first interface (a) respectively, and the second valve port (f) is connected to the first energy storage interface (c); and / or The second valve body (9) has a third valve port (g) and a fourth valve port (h) that are selectively connected to each other. The third valve port (g) is connected to the second cavity (4) and the second interface (b) respectively, and the fourth valve port (h) is connected to the second energy storage interface (d).

8. The hydraulic suspension system according to claim 7, characterized in that, The energy storage module includes: An energy storage device (15) having an energy storage chamber containing a medium; A first valve assembly has a first energy storage interface (c) and a third interface (i) connected to the first energy storage interface (c). The third interface (i) is connected to the energy storage chamber. The first valve assembly can selectively guide the medium to flow from the first energy storage interface (c) toward the third interface (i) or guide the medium to flow from the third interface (i) toward the first energy storage interface (c). The second valve assembly has a second energy storage interface (d) and a fourth interface (j) connected to the second energy storage interface (d). The fourth interface (j) is connected to the energy storage chamber. The second valve assembly can selectively guide the medium to flow from the second energy storage interface (d) toward the fourth interface (j) or guide the medium to flow from the fourth interface (j) toward the second energy storage interface (d).

9. The hydraulic suspension system according to claim 8, characterized in that, The first valve assembly includes: A first damping valve (14) has a fifth port (k) and the third port (i). The first one-way valve (11) has an inlet and an outlet. The inlet of the first one-way valve (11) is connected to the first energy storage interface (c), and the outlet of the first one-way valve (11) is connected to the fifth interface (k). The second one-way valve (10) has an inlet and an outlet. The inlet of the second one-way valve (10) is connected to the third interface (i), and the outlet of the second one-way valve (10) is connected to the first energy storage interface (c).

10. The hydraulic suspension system according to claim 9, characterized in that, The second valve assembly includes: The second damping valve (16) has a sixth port (L) and the fourth port (j); The third check valve (13) has an inlet and an outlet. The inlet of the third check valve (13) is connected to the second energy storage interface (d), and the outlet of the third check valve (13) is connected to the sixth interface (L). The fourth one-way valve (12) has an inlet and an outlet. The inlet of the fourth one-way valve (12) is connected to the fourth interface (j), and the outlet of the fourth one-way valve (12) is connected to the second energy storage interface (d).

11. The hydraulic suspension system according to any one of claims 7-10, characterized in that, The power module includes: A bidirectional hydraulic pump (6) having a first interface (a) and a second interface (b), the first interface (a) being selectively connected to a first cavity (2), and / or the second interface (b) being selectively connected to a second cavity (4), the bidirectional hydraulic pump (6) being adapted to selectively drive a medium to flow from the first interface (a) toward the second interface (b) or drive a medium to flow from the second interface (b) toward the first interface (a); A bidirectional drive motor (7) has a drive end connected to the bidirectional hydraulic pump (6).

12. The hydraulic suspension system according to claim 7, characterized in that, The power module includes: The third valve body (5) is disposed between the first interface (a) and the first cavity (2) and can selectively connect the first interface (a) and the first cavity (2).

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