Hydraulic suspension system and control method therefor

Abstract

Disclosed in embodiments of the present application are a hydraulic suspension system and a control method therefor. 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; the piston divides the interior of the hydraulic cylinder into a first cavity and a second cavity; media are stored in both the first cavity and the second cavity; 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 separately communicated with the first cavity and the first interface, and a second valve port of the first valve body is communicated with the first energy storage interface; and a third valve port of the second valve body is separately communicated with the second cavity and the second interface, and a fourth valve port of the second valve body is communicated with the second energy storage interface. According to the hydraulic suspension system designed in the present application, higher conversion efficiency and higher adjustment rate can be realized, and a larger active force adjustment range is output.

Description

Hydraulic suspension system and control method thereof

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application number 2024102471332, entitled “Hydraulic Suspension System and Control Method Thereof,” filed with the Patent Office of China on March 4, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application belongs to the field of hydraulic suspension systems, and in particular relates to a hydraulic suspension system and a control method thereof. Background Art

[0004] 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 hydraulic suspension systems, the hydraulic pump is connected in series with the damping valve, and the oil circuit will flow through the damping valve. The damping valve requires a certain opening pressure to open, which will cause back pressure to form at the other end of the hydraulic pump. At this time, the system will cause idling and burning of the motor due to insufficient reflux oil replenishment capacity, and since the damping valve requires a certain opening pressure to open, the system pressure adjustment speed is slow; in other hydraulic suspension systems, the hydraulic pump is connected in parallel with the damping valve to form two independent closed loops. However, in this system, high-pressure oil will leak through the damping valve, resulting in energy loss, causing low working efficiency of the system. 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.

[0005] Summary of the Invention

[0006] The present application aims to provide a hydraulic suspension system and a control method thereof to solve one of the problems existing in the prior art. The hydraulic suspension system designed according to the present application can achieve higher conversion efficiency and faster adjustment rate, and output a larger active force adjustment range.

[0007] In order to solve the above technical problems, this application is implemented as follows:

[0008] In a first aspect, the present application discloses a hydraulic suspension system, comprising: a hydraulic cylinder, wherein a piston is movably provided in the hydraulic cylinder, the piston dividing the interior of the hydraulic cylinder into a first cavity and a second cavity, wherein the first cavity and the second cavity both store a medium; a power module, wherein the power module has a first interface and a second interface, wherein the first interface is connected to the first cavity, and the second interface is connected to the second cavity, and the power module is 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; an energy storage module, wherein the energy storage module has a first energy storage interface and a second energy storage interface, and the energy storage module is suitable for storing or releasing the medium; a valve body, wherein the valve body comprises: a first valve body, wherein the first valve body has a first valve port and a second valve port that are selectively connected to each other, wherein the first valve port is respectively connected to the first cavity and the first interface, and the second valve port is connected to the first energy storage interface; and / or a second valve body, wherein the second valve body has a third valve port and a fourth valve port that are selectively connected to each other, wherein the third valve port is respectively connected to the second cavity and the second interface, and the fourth valve port is connected to the second energy storage interface.

[0009] According to the hydraulic suspension system of the present application, the energy storage module is connected in parallel with the hydraulic cylinder, and the energy storage module can be selectively connected to the oil circuit from the first energy storage interface and / or the second energy storage interface through the first valve body and / or the second valve body, which can avoid diversion by other structures or valve bodies and improve the system's working efficiency, so that the system can output greater active force and achieve a faster adjustment rate.

[0010] According to some embodiments of the present application, the energy storage module includes: an accumulator, the accumulator having an energy storage chamber, and a medium is stored in the energy storage chamber; a first valve group, the first valve group is formed with the first energy storage interface and a third interface connected to the first energy storage interface, the third interface is connected to the 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 valve group, the second valve group is formed with the second energy storage interface and a fourth interface connected to the second energy storage interface, the fourth interface is connected to the 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.

[0011] According to some embodiments of the present application, 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 application, 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 application, the power module includes: a bidirectional hydraulic pump, the bidirectional hydraulic pump having the first interface and the second interface, the first interface being selectively connected to the first cavity, and / or the second interface being selectively connected to the second cavity, 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 application, the power module includes: a third valve body, which is arranged between the first interface and the first cavity and can selectively connect the first interface and the first cavity.

[0015] In a second aspect, the present application also discloses a control method for the above-mentioned hydraulic suspension system.

[0016] The following briefly describes a control method for a hydraulic suspension system according to another embodiment of the present application. The hydraulic suspension system is configured as the hydraulic suspension system described in any one of the above embodiments.

[0017] The control method for a hydraulic suspension system according to the present application includes:

[0018] S1. Obtain suspension control signal;

[0019] S2. Controlling the hydraulic suspension system to switch to a high active mode according to the suspension control signal;

[0020] S3, 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 in the high active mode;

[0021] S4. Start the power module, and the power module drives the medium to flow from the first interface to the second interface or drives the medium to flow from the second interface to the first interface.

[0022] According to some embodiments of the present application, 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 in the high active mode, including:

[0023] S31, determining that a tire jump operation needs to be performed according to the suspension control signal, controlling the second valve body to be turned on and the first valve body to be turned off;

[0024] The starting of the power module, wherein the power module drives the medium to flow from the first interface to the second interface or drives the medium to flow from the second interface to the first interface, comprises:

[0025] S41 , starting the power module, and driving the medium to flow from the second interface to the first interface.

[0026] According to some embodiments of the present application, 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 in the high active mode, including:

[0027] S32, determining that a tire depressing 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;

[0028] Starting the power module, and driving the medium to flow from the first interface to the second interface or driving the medium to flow from the second interface to the first interface includes: S42, starting the power module, and driving the medium to flow from the first interface to the second interface.

[0029] According to some embodiments of the present application, obtaining a suspension control signal includes:

[0030] S11. Obtaining the suspension control signal based on a road surface signal, a driving mode signal, a suspension acceleration signal, a suspension displacement signal, a vehicle body acceleration signal, a vehicle speed signal, a steering wheel angle signal, and a battery charge signal, and based on one or more of the road surface signal, the driving mode signal, the suspension acceleration signal, the suspension displacement signal, the vehicle body acceleration signal, the vehicle speed signal, the steering wheel angle signal, and the battery charge signal; the suspension control signal includes a high active mode, a low active mode, and a passive mode.

[0031] According to some embodiments of the present application, the control method further includes:

[0032] S2′, controlling the suspension system to switch to a low active mode according to the suspension control signal;

[0033] S3', the hydraulic suspension system controls the first valve body and the second valve body to be connected in the low active mode;

[0034] S4′, starting the power module, and driving the medium to flow from the first interface to the second interface or driving the medium to flow from the second interface to the first interface.

[0035] According to some embodiments of the present application, the control method for the hydraulic suspension system further includes:

[0036] S2”, controlling the suspension system to switch to a passive mode according to the suspension control signal;

[0037] S3”: In the passive mode, the hydraulic suspension system controls the first valve body and the second valve body to be connected and controls the power module to be closed.

[0038] To sum up, according to the hydraulic suspension system of the present application, the energy storage module is connected in parallel with the hydraulic cylinder, and the energy storage module can be selectively connected to the oil circuit from the first energy storage interface and / or the second energy storage interface through the first valve body and / or the second valve body, which can avoid diversion by other structures or valve bodies, so that the hydraulic suspension system has higher conversion efficiency and faster adjustment rate, higher system working efficiency, and a larger active force adjustment range.

[0039] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0041] FIG1 is a diagram of a hydraulic suspension system according to an embodiment of the present application.

[0042] Passive mode example diagram;

[0043] FIG2 is an exemplary diagram of a low active mode of a hydraulic suspension system according to an embodiment of the present application;

[0044] FIG3 is an exemplary diagram of a hydraulic suspension system performing a tire jump in a high active mode according to an embodiment of the present application;

[0045] FIG4 is an exemplary diagram of a hydraulic suspension system executing a high active mode of tire depressing according to an embodiment of the present application;

[0046] FIG5 is a flow chart of a hydraulic suspension system control method according to an embodiment of the present application.

[0047] Reference numerals:

[0048] 100. Hydraulic suspension system;

[0049] 2. First cavity; 4. Second cavity; 3. Piston;

[0050] 5. The third valve body;

[0051] 6. Bidirectional hydraulic pump; a. First interface; b. Second interface;

[0052] 7. Bidirectional drive motor;

[0053] 15. Accumulator;

[0054] 14. First damping valve; i. Third interface; k. Fifth interface;

[0055] 11. First one-way valve; 10. Second one-way valve;

[0056] c. First energy storage interface;

[0057] 16, second damping valve; j, fourth interface; L, sixth interface;

[0058] 13. Third one-way valve; 12. Fourth one-way valve;

[0059] d. Second energy storage interface;

[0060] 8. First valve body; e. First valve port; f. Second valve port;

[0061] 9. Second valve body; g. Third valve port; h. Fourth valve port. Specific embodiments

[0062] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0063] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly refer to one or more of the features. Throughout the description of this application, unless otherwise specified, "plurality" means two or more. Furthermore, "and / or" in the specification and claims refers to at least one of the connected entities, and the character " / " generally indicates an "or" relationship between the connected entities.

[0064] In the description of the present application, 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", "axial", "radial", "circumferential" and the like 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 application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0065] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0066] 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 hydraulic suspension systems, the hydraulic pump is connected in series with the damping valve, and the oil circuit will flow through the damping valve. The damping valve requires a certain opening pressure to open, which will cause back pressure to form at the other end of the hydraulic pump. At this time, the system will cause idling and burning of the motor due to insufficient reflux oil replenishment capacity, and since the damping valve requires a certain opening pressure to open, the system pressure adjustment speed is slow; in other hydraulic suspension systems, the hydraulic pump is connected in parallel with the damping valve to form two independent closed loops. However, in this system, high-pressure oil will leak through the damping valve, resulting in energy loss, causing low working efficiency of the system. 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.

[0067] A hydraulic suspension system 100 according to an embodiment of the present application will be described below with reference to FIG. 1 to FIG. 4 .

[0068] As shown in FIG. 1 to FIG. 4 , the hydraulic suspension system 100 according to the present application includes: a hydraulic cylinder, a power module, an energy storage module and a valve body. A piston 3 is movably arranged 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, and the first cavity 2 and the second cavity 4 both 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 cavity 2, and the second interface b is connected to the second cavity 4, and the power module is suitable for driving the medium to flow from the first interface a toward the second interface b or driving the medium to flow from the second interface b toward the first interface a; the energy storage module has a first energy storage interface c and a second energy storage interface d, and the energy storage module is suitable for storing or releasing the medium; the valve body includes a first valve body 8 and / or a second valve body 9; wherein, the first valve body 8 has a first valve port e and a second valve port f that can be selectively connected to each other, the first valve port e is respectively connected to the first cavity 2 and the first interface a, 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 can be selectively connected to each other, the third valve port g is respectively connected to the second cavity 4 and the second interface b, and the fourth valve port h is connected to the second energy storage interface d.

[0069] In the embodiment of the present application, the piston 3 includes two opposing sides, wherein one side of the piston 3 is located within the first cavity 2 and the other side of the piston 3 is located within the second cavity 4. The hydraulic suspension system 100 also includes a piston rod 1, which is connected to the side of the piston 3 located within the first cavity 2 and at least partially extends outside the hydraulic cylinder. In practical applications, the piston rod 1 can be used to connect to a tire or vehicle body and act as a connector to drive the piston movement. It is understood that because the piston rod occupies space in the first cavity 2, the change in the medium in the first cavity 2 is less than the change in the medium in the second cavity 4 when the piston 3 moves. In the oil circuit of the hydraulic suspension system 100, the energy storage module and the power module can participate in pressure regulation in the oil circuit. The first valve body 8 connects the first energy storage port c of the energy storage module to the oil circuit, allowing the energy storage module to communicate with the first cavity 2 via the first energy storage port c. The second valve body 9 connects the second energy storage port d of the energy storage module to the oil circuit, allowing the energy storage module to communicate with the second cavity 4 via the second energy storage port d.

[0070] 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 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 not enough 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 into the oil circuit. At this time, the energy storage module is used to replenish the medium into the system to reduce the system pressure pulsation until the system pressure balance is reached; under the action of the power module, 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 more than the amount of medium required by the first cavity 2, 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 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 excess medium that cannot enter the first cavity 2. At this time, the energy storage module is 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.

[0071] 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 to press the tire down or move the vehicle body 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 to jump up or move the vehicle body downward.

[0072] According to the hydraulic suspension system 100 of the present application, the energy storage module is connected in parallel with the hydraulic cylinder, and the energy storage module can be selectively connected to the oil circuit from the first energy storage interface c and / or the second energy storage interface d through the first valve body 8 and / or the second valve body 9, which can avoid diversion by other structures or valve bodies and improve the system's working efficiency, so that the system can output greater active force and achieve a faster adjustment rate.

[0073] According to some embodiments of the present application, as shown in Figures 1 to 4, the energy storage module includes an accumulator 15, a first valve group and a second valve group. The accumulator 15 has an energy storage chamber, and a medium is stored in the energy storage chamber; a first energy storage interface c and a third interface i connected to the first energy storage interface c are formed on the first valve group, and 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 from the third interface i toward the first energy storage interface c; a second energy storage interface d and a fourth interface j connected to the second energy storage interface d are formed on the second valve group, and 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 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 connected, the accumulator 15 is connected to the oil circuit through the first valve group, and when the third valve port g and the fourth valve port h of the second valve body 9 are connected, the accumulator 15 is connected to the oil circuit through the second valve group, so as to selectively replenish the medium to the second chamber 4 or store the excess medium in the oil circuit, and store and replenish the oil to the system as needed, thereby attenuating the pressure fluctuation of the system.

[0074] According to some embodiments of the present application, as shown in Figures 1 to 4, the first valve group includes a first damping valve 14, a first one-way valve 11 and a second one-way valve 10, the first damping valve 14 has a fifth interface k and a third interface 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. When the first valve port e and the second valve port f of the first valve body 8 are connected, the accumulator 15 is connected to the oil circuit through the first valve group, and the medium can flow through the first one-way valve 11 and the first damping valve 14 through the first energy storage interface c and flow to the accumulator 15 from the third interface i. The medium can also flow through the second one-way valve 10 through the third interface i and flow to the first valve body 8 from the first energy storage interface c, so as to selectively replenish the medium to the oil circuit or store excess medium in the oil circuit, thereby attenuating the pressure fluctuations of the system.

[0075] According to some embodiments of the present application, as shown in Figures 1 to 4, the second valve group includes a second damping valve 16, a third one-way valve 13 and a fourth one-way valve 12, the second damping valve 16 has a sixth interface L and a fourth interface j; the third one-way valve 13 has an inlet and an outlet, the inlet of the third one-way valve 13 is connected to the second energy storage interface d, and the outlet of the third one-way 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. When the third valve port g and the fourth valve port h of the second valve body 9 are connected, the accumulator 15 is connected to the oil circuit through the second valve group, and the medium can flow through the third one-way valve 13 and the second damping valve 16 through the second energy storage interface d and flow to the accumulator 15 from the fourth interface j. The medium can also flow through the fourth one-way valve 12 through the fourth interface j and flow to the second valve body 9 from the second energy storage interface d, so as to selectively replenish the medium to the oil circuit or store excess medium in the oil circuit, thereby attenuating the pressure fluctuations of the system.

[0076] According to some embodiments of the present application, as shown in Figures 1 to 4, 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 the first cavity 2, and / or the second interface b can be selectively connected to the second cavity 4. The bidirectional hydraulic pump 6 is suitable for selectively driving the medium to flow from the first interface a toward the second interface b or from the second interface b toward the first interface a. The bidirectional drive motor 7 has a driving end connected to the bidirectional hydraulic pump 6. The bidirectional hydraulic pump 6 is electrically connected to the bidirectional drive motor 7. Driven by the bidirectional drive motor 7, the bidirectional hydraulic pump 6 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.

[0077] According to some embodiments of the present application, as shown in Figures 1 to 4, the power module includes a third valve body 5, which is arranged 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 adjustment and passive adjustment, thereby enriching the functions of the hydraulic suspension system 100.

[0078] The present application realizes rapid switching of multiple working states by designing the first valve body 8, the second valve body 9 and the third valve body 5, and each mode is independently controlled and does not affect each other. Compared with the existing technology, the high active mode of the system can achieve higher conversion efficiency and faster adjustment rate, and output 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 system to realize high-level functions such as three-wheel driving, on-the-spot jumping and assisted escape; in medium and low frequency road conditions, the low active mode is switched to coordinate the active force and damping force, thereby improving the vehicle's handling performance and driving stability under such road conditions; in high frequency road conditions, the passive mode is switched to perform damping adjustment, saving vehicle power, and taking into account economy, comfort and handling stability.

[0079] The following briefly describes a control method for a hydraulic suspension system according to the present application, where the hydraulic suspension system is configured as the hydraulic suspension system described in any one of the above embodiments.

[0080] As shown in FIG5 , the control method for the hydraulic suspension system according to the present application includes:

[0081] S1. Obtain suspension control signal;

[0082] S2. Controlling the hydraulic suspension system to switch to a high active mode according to the suspension control signal;

[0083] S3, 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 in the high active mode;

[0084] S4. Start the power module, and the power module drives the medium to flow from the first interface to the second interface or drives the medium to flow from the second interface to the first interface.

[0085] Here, the hydraulic suspension system has a suspension controller, which collects and analyzes signals to obtain a suspension control signal. The suspension controller can control the system to switch to a high-active mode according to the suspension control signal. In the high-active mode, the suspension controller controls one of the first valve body and the second valve body to be turned on, while the other of the first valve body and the second valve body is turned off, so that the accumulator is only connected to the oil circuit through the first energy storage interface or the second energy storage interface. When the suspension controller determines that the tire needs to be pressed down, the first valve body is turned on, and the accumulator is connected to the oil circuit through the first energy storage interface. At this time, the piston moves upward, and the liquid in the first cavity is squeezed and flows from the power module to the second cavity. Since the amount of medium flowing into the second cavity is less than the amount of medium flowing out of the first cavity, the accumulator is required to replenish the medium to the oil circuit through the first energy storage interface; when the suspension controller determines that the tire needs to be jumped, the second valve body is turned on, and the accumulator is connected to the oil circuit through the second energy storage interface. At this time, the piston moves downward, and the liquid in the second cavity is squeezed and flows from the power module to the first cavity. Since the amount of medium flowing into the first cavity is too much, the accumulator is required to store excess medium in the oil circuit through the second energy storage interface. The energy storage module is used to reduce system pressure pulsation until the system pressure balance is reached, thereby realizing high-active power regulation.

[0086] According to some embodiments of the present application, 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 in the high active mode, including:

[0087] S31, determining that a tire jump operation needs to be performed according to the suspension control signal, controlling the second valve body to be turned on and the first valve body to be turned off;

[0088] The starting of the power module, wherein the power module drives the medium to flow from the first interface to the second interface or drives the medium to flow from the second interface to the first interface, comprises:

[0089] S41 , starting the power module, and driving the medium to flow from the second interface to the first interface.

[0090] Here, when the suspension controller determines that the tire needs to jump up or the body needs to move downward, the bidirectional drive motor drives the bidirectional hydraulic pump to work, the high-pressure oil flows through the third valve body and pushes the piston to move 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 and reduce system pressure pulsation until the system pressure balance is reached, thereby realizing high-active power regulation.

[0091] According to some embodiments of the present application, 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 in the high active mode, including:

[0092] S32, determining that a tire depressing 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;

[0093] The starting of the power module, wherein the power module drives the medium to flow from the first interface to the second interface or drives the medium to flow from the second interface to the first interface, comprises:

[0094] S42: Start the power module, and drive the medium to flow from the first interface to the second interface.

[0095] Here, when the suspension controller determines that the tire needs to be pressed down or the vehicle body needs to move upward, the bidirectional drive motor drives the bidirectional hydraulic pump to work, and the high-pressure oil pushes the piston upward. The liquid in the first chamber of the hydraulic cylinder is squeezed, flows through the third valve body, and flows back to the bidirectional hydraulic pump. The accumulator is used to replenish the system oil and reduce the system pressure pulsation until the system pressure balance is reached, thereby realizing high-active power regulation.

[0096] According to some embodiments of the present application, obtaining a suspension control signal includes:

[0097] S11. Obtaining the suspension control signal based on a road surface signal, a driving mode signal, a suspension acceleration signal, a suspension displacement signal, a vehicle body acceleration signal, a vehicle speed signal, a steering wheel angle signal, and a battery charge signal, and based on one or more of the road surface signal, the driving mode signal, the suspension acceleration signal, the suspension displacement signal, the vehicle body acceleration signal, the vehicle speed signal, the steering wheel angle signal, and the battery charge signal; the suspension control signal includes a high active mode, a low active mode, and a passive mode.

[0098] The hydraulic suspension system's operating mode is controlled by a suspension controller. This controller generates suspension control signals based on collected road surface signals, driving mode signals (for vehicles with a driving mode selection), suspension acceleration signals, suspension displacement signals, vehicle acceleration signals, vehicle speed signals, steering wheel angle signals, and battery charge signals. This allows the controller to determine whether the hydraulic suspension system operates in high-active mode, low-active mode, 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, which are controlled by current signals in the hydraulic suspension system, are all controlled by the suspension controller.

[0099] This application provides an accumulator, multiple valve bodies, multiple damping valves and multiple one-way valves to enable the hydraulic suspension system to quickly switch between multiple working modes, and realize independent control of passive mode, low active mode and high active mode without affecting each other.

[0100] As shown in FIG3 and FIG4, the high active mode according to the embodiment of the present application is:

[0101] The suspension controller analyzes the collected signals and determines that the system should be in high-active mode.

[0102] In high-active mode, when the suspension controller determines that a tire jump or downward movement of the vehicle body is necessary, it switches the second and third valve bodies on and the first valve body off. At this point, the bidirectional drive motor and accumulator are connected to the oil circuit. The bidirectional drive motor drives the bidirectional hydraulic pump. 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 into the bidirectional hydraulic pump. The accumulator is used to store system oil, reducing system pressure pulsation until system pressure balance is achieved, thus achieving high-active force regulation.

[0103] In High Active mode, when the suspension controller determines that tire downward pressure or vehicle body upward movement is necessary, it switches the first and third valve bodies on and the second valve body off. At this point, the bidirectional drive motor and accumulator are connected to the oil circuit. The bidirectional drive motor drives the bidirectional hydraulic pump, and high-pressure oil pushes the piston upward. This squeezes the fluid in the first chamber of the hydraulic cylinder, flows through the third valve body, and returns to the bidirectional hydraulic pump. The accumulator replenishes the system oil, reducing system pressure pulsation until system pressure balance is achieved, thus achieving High Active force regulation.

[0104] According to some embodiments of the present application, the control method further includes:

[0105] S2′, controlling the suspension system to switch to a low active mode according to the suspension control signal;

[0106] S3', the hydraulic suspension system controls the first valve body and the second valve body to be connected in the low active mode;

[0107] S4′, starting the power module, and driving the medium to flow from the first interface to the second interface or driving the medium to flow from the second interface to the first interface.

[0108] Here, as shown in FIG2 , the low active power working mode according to an embodiment of the present application is:

[0109] The suspension controller analyzes the collected signals and determines that the system should be in low active power working mode.

[0110] In the low active power working mode, the suspension controller controls the first valve body, the second valve body, and the third valve body to be in the conductive state. At this time, the bidirectional drive motor and the accumulator are connected to the oil circuit.

[0111] When the suspension controller determines that the tire needs to jump up or the vehicle body needs to move downward, the bidirectional drive motor drives the bidirectional hydraulic pump to work. The 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 and enters the accumulator until the system pressure is balanced, thereby achieving coordinated control of low active force and damping adjustment.

[0112] When the suspension controller determines that the tire needs to be pressed down or the vehicle body needs to move upward, the bidirectional drive motor drives the bidirectional hydraulic pump to work, and the high-pressure oil enters the second cavity and pushes the piston upward. The liquid in the first cavity is squeezed, flows through the third valve body, and flows back to 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 and is replenished into the bidirectional hydraulic pump until the system pressure is balanced, thereby realizing the coordinated control of low active force and damping adjustment.

[0113] According to some embodiments of the present application, the control method for the hydraulic suspension system further includes:

[0114] S2”, controlling the suspension system to switch to a passive mode according to the suspension control signal;

[0115] S3”: In the passive mode, the hydraulic suspension system controls the first valve body and the second valve body to be connected and controls the power module to be closed.

[0116] Here, as shown in FIG1 , the passive mode according to an embodiment of the present application is:

[0117] The suspension controller analyzes the collected signals and determines that the system should be in passive mode;

[0118] In the 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;

[0119] When the tire jumps or the vehicle body moves downward, the liquid in the second chamber is squeezed and flows through the second valve body, the third one-way valve, and the second damping valve. Here, the opening of the second damping valve can be adjusted by changing the input current, and the damping force of the second damping valve in the passive adjustment mode can be adjusted. Part of the medium enters the accumulator, and the other part flows through the second one-way valve into the first chamber.

[0120] When the tire is pressed down or the vehicle body moves upward, the liquid in the first cavity is squeezed and flows through the first valve body, the first one-way valve, and the first damping valve. Here, the damping force in the passive adjustment mode can be adjusted by adjusting the opening of the first damping valve by changing the input current. The accumulator replenishes the medium to the oil circuit. The replenished medium and the medium flowing through the first damping valve flow through the fourth one-way valve and the second valve body into the second cavity.

[0121] To sum up, according to the hydraulic suspension system of the present application, the energy storage module is connected in parallel with the hydraulic cylinder, and the energy storage module can be selectively connected to the oil circuit from the first energy storage interface and / or the second energy storage interface through the first valve body and / or the second valve body, which can avoid diversion by other structures or valve bodies, so that the hydraulic suspension system has higher conversion efficiency and faster adjustment rate, higher system working efficiency, and a larger active force adjustment range.

[0122] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0123] References herein to "one embodiment," "an embodiment," or "one or more embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Furthermore, please note that instances of the phrase "in one embodiment" do not necessarily all refer to the same embodiment.

[0124] In the description provided herein, a large number of specific details are described. However, it is understood that the embodiments of the present application can be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description.

[0125] In the claims, any reference signs placed between brackets shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in the claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present application may be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, and third etc. does not indicate any order. These words may be interpreted as names.

[0126] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A hydraulic suspension system, characterized in that: include: A hydraulic cylinder, wherein a piston (3) is movably provided in the hydraulic cylinder, the piston (3) divides the interior of the hydraulic cylinder into a first cavity (2) and a second cavity (4), and the first cavity (2) and the second cavity (4) both store a medium; A power module, the power module having a first interface (a) and a second interface (b), the first interface (a) being in communication with the first cavity (2), the second interface (b) being in communication with 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); An energy storage module, the energy storage module having a first energy storage interface (c) and a second energy storage interface (d), the energy storage module being suitable for storing or releasing a medium; A valve body, comprising: a first valve body (8), the first valve body (8) having a first valve port (e) and a second valve port (f) that are selectively connectable 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), wherein the second valve body (9) has a third valve port (g) and a fourth valve port (h) that are selectively connectable 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).

2. The hydraulic suspension system according to claim 1, characterized in that: The energy storage module comprises: An accumulator (15), the accumulator (15) having an energy storage chamber, wherein a medium is stored in the energy storage chamber; a first valve group, wherein the first energy storage interface (c) and a third interface (i) communicating with the first energy storage interface (c) are formed on the first valve group, the third interface (i) communicating with the energy storage chamber, and 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); A second valve group is formed with the 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, and 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).

3. The hydraulic suspension system according to claim 2, characterized in that: The first valve group includes: a first damping valve (14), the first damping valve (14) having a fifth port (k) and the third port (i); a first one-way valve (11), the first one-way valve (11) having an inlet and an outlet, the inlet of the first one-way valve (11) being in communication with the first energy storage interface (c), and the outlet of the first one-way valve (11) being in communication with the fifth interface (k); A second one-way valve (10), wherein the second one-way valve (10) has an inlet and an outlet. The inlet of (10) is communicated with the third interface (i), and the outlet of the second one-way valve (10) is communicated with the first energy storage interface (c).

4. The hydraulic suspension system according to claim 3, characterized in that: The second valve group includes: a second damping valve (16), the second damping valve (16) having a sixth port (L) and the fourth port (j); a third one-way valve (13), the third one-way valve (13) having an inlet and an outlet, the inlet of the third one-way valve (13) being in communication with the second energy storage interface (d), and the outlet of the third one-way valve (13) being in communication with the sixth interface (L); A fourth one-way valve (12), the fourth one-way valve (12) having an inlet and an outlet, the inlet of the fourth one-way valve (12) being in communication with the fourth interface (j), and the outlet of the fourth one-way valve (12) being in communication with the second energy storage interface (d).

5. The hydraulic suspension system according to any one of claims 1 to 4, characterized in that: The power module includes: A bidirectional hydraulic pump (6), the bidirectional hydraulic pump (6) having a first interface (a) and a second interface (b), the first interface (a) selectively communicating with the first cavity (2), and / or the second interface (b) selectively communicating with the 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 to drive a medium to flow from the second interface (b) toward the first interface (a); A bidirectional drive motor (7), wherein the bidirectional drive motor (7) has a drive end connected to the bidirectional hydraulic pump (6).

6. The hydraulic suspension system according to claim 1, characterized in that: The power module includes: A third valve body (5) is provided between the first interface (a) and the first cavity (2) and can selectively connect the first interface (a) and the first cavity (2).

7. A control method for a hydraulic suspension system, characterized in that: The hydraulic suspension system is configured as the hydraulic suspension system according to any one of claims 1 to 6, and the control method includes: S1. Obtain 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 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 in the high active mode; S4. Start the power module, and the power module drives the medium to flow from the first interface to the second interface or drives the medium to flow from the second interface to the first interface.

8. The control method for a hydraulic suspension system according to claim 7, characterized in that: 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 in the high active mode, comprising: S31, judging that a tire jump operation needs to be performed according to the suspension control signal, controlling the second valve body to be turned on, the first valve body to be turned on, and the second valve body to be turned on. A valve body is shut off; The starting of the power module, wherein the power module drives the medium to flow from the first interface to the second interface or drives the medium to flow from the second interface to the first interface, comprises: S41 , starting the power module, and driving the medium to flow from the second interface to the first interface.

9. The control method for a hydraulic suspension system according to claim 7, characterized in that: 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 in the high active mode, comprising: S32, determining that a tire depressing 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 starting of the power module, wherein the power module drives the medium to flow from the first interface to the second interface or drives the medium to flow from the second interface to the first interface, comprises: S42: Start the power module, and drive the medium to flow from the first interface to the second interface.

10. The control method for a hydraulic suspension system according to claim 7, characterized in that: The obtaining of the suspension control signal comprises: S11. Obtaining the suspension control signal based on a road surface signal, a driving mode signal, a suspension acceleration signal, a suspension displacement signal, a vehicle body acceleration signal, a vehicle speed signal, a steering wheel angle signal, and a battery charge signal, and based on one or more of the road surface signal, the driving mode signal, the suspension acceleration signal, the suspension displacement signal, the vehicle body acceleration signal, the vehicle speed signal, the steering wheel angle signal, and the battery charge signal; the suspension control signal includes a high active mode, a low active mode, and a passive mode.

11. The control method for a hydraulic suspension system according to claim 10, characterized in that: 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 controls the first valve body and the second valve body to be connected in the low active mode; S4′, starting the power module, and driving the medium to flow from the first interface to the second interface or driving the medium to flow from the second interface to the first interface.

12. The control method for a hydraulic suspension system according to claim 10, characterized in that: Also includes: S2”, controlling the suspension system to switch to a passive mode according to the suspension control signal; S3”: In the passive mode, the hydraulic suspension system controls the first valve body and the second valve body to be connected and controls the power module to be closed.

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