Hydraulic suspension system, suspension system control method, vehicle, and storage medium

Abstract

This application provides a hydraulic suspension system, a suspension system control method, a vehicle, and a storage medium. The system includes a damping flow path, a shock absorber and a regulating valve disposed on the damping flow path, a connecting flow path, and a one-way pump disposed on the connecting flow path. The damping flow path can be selectively connected to the connecting flow path to form a damping circuit or disconnected from at least one end of the connecting flow path. An electric motor is connected to the one-way pump and has a driving state and a stopped state. This application solves the technical problems of existing active suspension systems using bidirectional oil pumps, which have complex structures, high manufacturing costs, and are prone to control delays during frequent forward and reverse switching.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and more specifically, to a hydraulic suspension system, a suspension system control method, a vehicle, and a storage medium. Background Technology

[0002] In the field of vehicle engineering, suspension systems are a key technology for ensuring ride comfort and handling stability. With the continuous advancement of vehicle technology, passive suspension systems (traditional suspensions) have gradually revealed their limitations, primarily in their inability to adjust damping force and stiffness, making them ill-suited to complex and changing road conditions and driving demands. This inherent drawback of passive suspension systems has spurred the development of active and semi-active suspension technologies. By directly adjusting the suspension damping force or stiffness through external power sources (such as oil pumps and electric motors), they can actively respond to road excitations, maintain vehicle stability, and thus significantly improve vehicle handling and comfort. Active suspension systems typically include highly integrated sensors, controllers, and actuators, enabling real-time road condition perception and precise suspension adjustments, but they are also more complex and costly.

[0003] Most existing active suspension systems use bidirectional oil pumps, which are complex in structure, have high manufacturing costs, and are prone to control delays and accuracy problems during frequent forward and reverse switching. Summary of the Invention

[0004] This application provides a hydraulic suspension system, a suspension system control method, a vehicle, and a storage medium to at least solve the technical problems in the prior art where active suspension systems use bidirectional oil pumps, resulting in complex structures, high manufacturing costs, and control delays that are prone to occur during frequent forward and reverse switching.

[0005] According to one aspect of the embodiments of this application, a hydraulic suspension system is provided, suitable for vehicles, comprising: a damping flow path, a damper and an adjusting valve disposed on the damping flow path, a connecting flow path, and a one-way pump disposed on the connecting flow path, wherein the damping flow path is selectively connected to the connecting flow path to form a damping circuit or disconnected from at least one end of the connecting flow path; an electric motor connected to the one-way pump, the electric motor having a driving state and a stopping state; wherein the hydraulic suspension system has an active mode, a semi-active mode, and a passive mode, and when the hydraulic suspension system is in the active mode, the damping flow path is connected to the connecting flow path to form a damping circuit. When the hydraulic suspension system is in semi-active mode, the damping flow path and the connecting flow path are connected to form a damping circuit, and the motor is in a driving state; or the damping flow path and the connecting flow path are disconnected and the damping flow path is dynamically adjusted through the regulating valve. When the hydraulic suspension system is in passive mode, the damping flow path and the connecting flow path are connected to form a damping circuit, the motor is in a driving state, and the opening of the regulating valve is limited to a fixed value; or the damping flow path and the connecting flow path are disconnected, and the opening of the regulating valve is limited to a fixed value, and the motor is in a stopped state.

[0006] Furthermore, the regulating valve includes a first regulating valve and a second regulating valve disposed on the damping flow path. The damper has a compression state and a recovery state. The damper includes a compression chamber and a recovery chamber with relatively variable volumes. When the hydraulic suspension system is in semi-active mode and the motor is in a stopped state, when the damper is in a compression state, the first port of the damping flow path is connected to the recovery chamber, the second port of the damping flow path is connected to the compression chamber, the second regulating valve is in an open state, and the first regulating valve is in a closed state, so that the oil flows from the recovery chamber through the first port into the damping flow path, and after flowing through the second regulating valve, it enters the compression chamber through the second port.

[0007] Furthermore, when the shock absorber is in the recovery state, the first regulating valve is in the open state and the second regulating valve is in the closed state, so that the oil flows from the compression chamber into the shock absorption flow path through the second port, and after flowing through the first regulating valve, it enters the recovery chamber through the first port.

[0008] Furthermore, the hydraulic suspension system also includes a switching valve, which has a first connecting port, a second connecting port, a third connecting port, and a fourth connecting port. The third port of the damping flow path is connected to the first connecting port, the fourth port of the damping flow path is connected to the fourth connecting port, the fifth port of the connecting flow path is connected to the third connecting port, and the sixth port of the connecting flow path is connected to the second connecting port. The switching valve has a first switching state and a second switching state. When it is in the first switching state, the first connecting port is connected to the third connecting port and the second connecting port is connected to the fourth connecting port. When it is in the second switching state, the first connecting port is connected to the second connecting port and the third connecting port is connected to the fourth connecting port. When the shock absorber is in the compression state and the motor is in the driving state, the switching valve is in the first switching state. When the shock absorber is in the recovery state and the motor is in the driving state, the switching valve is in the second switching state. The switching valve and the regulating valve are connected in parallel.

[0009] Furthermore, the hydraulic suspension system also includes a switching solenoid valve, which is located in the damping flow path and relatively close to the third port. When the motor is in a stopped state, the switching solenoid valve is closed, and when the motor is in a driven state, the switching solenoid valve is open. The switching solenoid valve is connected in parallel with the regulating valve and in series with the switching valve.

[0010] Furthermore, when the hydraulic suspension system is in active mode, the shock absorber is in a compressed state and the motor is in a driving state, the regulating valve is in a closed state, the switching valve is in a first switching state, and the switching solenoid valve is open.

[0011] Furthermore, when the hydraulic suspension system is in passive mode, the shock absorber is in a compressed state, and the motor is in a stopped state, the opening of the second regulating valve is constant, and the first regulating valve is closed, so that the oil flows from the self-restoration chamber into the damping flow path through the first end, and then flows through the second regulating valve and enters the compression chamber through the second end.

[0012] Furthermore, when the hydraulic suspension system is in passive mode, the shock absorber is in the recovery state, and the motor is in the off state, the opening of the first regulating valve is constant, and the second regulating valve is in the open state, so that the oil flows from the compression chamber into the damping flow path through the second end, and after flowing through the first regulating valve, it enters the recovery chamber through the first end.

[0013] Furthermore, when the hydraulic suspension system is in passive mode, the shock absorber is in a compressed state and the motor is in a driven state, the switching valve is in a first switching state; and / or, when the hydraulic suspension system is in passive mode, the shock absorber is in a restoring state and the motor is in a driven state, the switching valve is in a second switching state.

[0014] According to another aspect of the embodiments of this application, a suspension system control method is also provided, which is applicable to the above-described system. The method includes: acquiring the road excitation frequency of the vehicle's suspension system.

[0015] The operating mode of the suspension system is determined based on the road surface excitation frequency and marked as the target mode. The operating mode includes any one of the active mode, semi-active mode and passive mode.

[0016] The suspension system operates according to the target pattern.

[0017] Furthermore, the control methods also include:

[0018] The operation feedback mode is formed in response to the user's touch operation. The operation feedback mode includes standard mode, comfort mode, sports mode and energy saving mode.

[0019] Based on the correspondence between the operation feedback mode and the working mode, determine the working mode corresponding to the operation feedback mode and mark it as the target mode.

[0020] According to another aspect of the embodiments of this application, a vehicle is also provided, including: a memory storing an executable program; and a processor for running the program, wherein the program executes the methods in various embodiments of this application when it runs.

[0021] According to another aspect of the embodiments of this application, a computer-readable storage medium is also provided, the computer-readable storage medium including a stored executable program, wherein, when the executable program is running, it controls the device where the computer-readable storage medium is located to perform the methods of various embodiments of this application.

[0022] According to another aspect of the embodiments of this application, a computer program product is also provided, including a computer program that, when executed by a processor, implements the methods of various embodiments of this application.

[0023] According to another aspect of the embodiments of this application, a computer program product is also provided, including a non-volatile computer-readable storage medium storing a computer program that, when executed by a processor, implements the methods in various embodiments of this application.

[0024] According to another aspect of the embodiments of this application, a computer program is also provided, which, when executed by a processor, implements the methods of the various embodiments of this application.

[0025] In this embodiment, by replacing the traditional bidirectional oil pump with a unidirectional pump and an electromagnetic reversing structure, the hydraulic system structure is simplified, and manufacturing costs and control complexity are reduced. In active mode, the unidirectional pump is driven by an electric motor and achieves active actuation by switching the oil circuit direction through a solenoid valve, avoiding the response delay and mechanical inertia problems caused by the forward and reverse rotation of the bidirectional pump. In semi-active mode, the system can selectively disconnect the oil pump circuit and dynamically adjust the damping only through the regulating valve to reduce energy consumption and improve control response speed. In passive mode, the system can choose to use the oil pump as a hydraulic motor to provide constant generating damping and work together with a fixed opening regulating valve, or completely disconnect the oil pump circuit and rely only on the regulating valve to provide basic damping to achieve passive energy-saving operation. Attached Figure Description

[0026] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0027] Figure 1 This is a schematic diagram of the hydraulic suspension system corresponding to Embodiment 1 of this application;

[0028] Figure 2 This is a schematic diagram of the hydraulic suspension system corresponding to Embodiment 2 of this application;

[0029] Figure 3 This is a schematic diagram of the hydraulic suspension system corresponding to Embodiment 3 of this application;

[0030] Figure 4 This is a schematic diagram of the hydraulic suspension system corresponding to Embodiment 4 of this application;

[0031] Figure 5 This is a schematic diagram of the hydraulic suspension system corresponding to Embodiment 5 of this application;

[0032] Figure 6 This is a schematic diagram of the hydraulic suspension system corresponding to Embodiment 6 of this application;

[0033] Figure 7 This is a schematic diagram of the hydraulic suspension system corresponding to Embodiment 7 of this application;

[0034] Figure 8 This is a schematic diagram of the hydraulic suspension system corresponding to Embodiment 8 of this application;

[0035] Figure 9 This is a schematic diagram of the hydraulic suspension system corresponding to Embodiment 9 of this application;

[0036] Figure 10 This is a schematic diagram of the hydraulic suspension system corresponding to Embodiment 10 of this application.

[0037] Figure 11 This is a flowchart of a suspension system control method according to an embodiment of this application.

[0038] 1. Vibration damper; 11. Vibration damping piston; 12. Compression chamber; 13. Recovery chamber; 14. Accumulator;

[0039] 2. Control valve; 21. First control valve; 22. Second control valve;

[0040] 3. One-way pump; 4. Electric motor;

[0041] 5. Switching valve; 51. First connecting port; 52. Second connecting port; 53. Third connecting port; 54. Fourth connecting port;

[0042] 6. Switch the solenoid valve. Detailed Implementation

[0043] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0044] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0045] This application provides a hydraulic suspension system suitable for vehicles. The hydraulic suspension system includes a damping flow path, a damper 1 and an adjusting valve 2 disposed on the damping flow path, a connecting flow path, and a one-way pump 3 disposed on the connecting flow path. The damping flow path can be selectively connected to the connecting flow path to form a damping circuit or disconnected from at least one end of the connecting flow path.

[0046] The electric motor 4 is connected to the one-way pump 3, and the electric motor 4 has a driving state and a stopping state;

[0047] The hydraulic suspension system has active, semi-active, and passive modes. When the hydraulic suspension system is in active mode, the damping flow path and the connecting flow path are connected to form a damping circuit, and the motor 4 is in a driving state to drive the one-way pump 3 to rotate. When the hydraulic suspension system is in semi-active mode, the damping flow path and the connecting flow path are connected to form a damping circuit, and the motor 4 is in a driving state, or the damping flow path and the connecting flow path are disconnected and the damping flow path is dynamically adjusted through the regulating valve 2. When the hydraulic suspension system is in passive mode, the damping flow path and the connecting flow path are connected to form a damping circuit, the motor 4 is in a driving state, and the opening of the regulating valve 2 is limited to a fixed value, or the damping flow path and the connecting flow path are disconnected, and the opening of the regulating valve 2 is limited to a fixed value, and the motor 4 is in a stopped state.

[0048] The vibration damper 1 includes a vibration damping chamber and a vibration damping piston 11 movably disposed within the vibration damping chamber. The vibration damping piston 11 divides the vibration damping chamber into a compression chamber 12 and a recovery chamber 13, the volumes of which can be relatively variable. A compression safety valve is disposed in the compression chamber 12, and a recovery safety valve is disposed in the recovery chamber 13. When the pressure in at least one of the chambers in the recovery chamber 13 or the compression chamber 12 exceeds a preset pressure, at least one of the recovery safety valve and the compression safety valve is in an open state, so that the compression chamber 12 and the recovery chamber 13 are connected. The vibration damper 1 has a compression state and a recovery state.

[0049] By replacing the traditional bidirectional oil pump with a unidirectional pump 3 and a switching valve 5, the hydraulic system structure is simplified, and manufacturing costs and control complexity are reduced. In active mode, the unidirectional pump 3 is driven by an electric motor 4, and the switching valve 5 switches the direction of the oil circuit to achieve active actuation, avoiding the response delay and mechanical inertia problems caused by the forward and reverse rotation of the bidirectional pump. In semi-active mode, the system can selectively disconnect the oil pump circuit and dynamically adjust the damping only through the regulating valve 2 to reduce energy consumption and improve control response speed. In passive mode, the system can choose to use the oil pump as a hydraulic motor to provide constant generating damping and work together with the fixed opening regulating valve 2, or completely disconnect the oil pump circuit and rely only on the regulating valve 2 to provide basic damping to achieve passive energy-saving operation.

[0050] Example 1

[0051] like Figure 1The diagram shows the first flow pattern of hydraulic fluid in a semi-active mode of a hydraulic suspension system. The regulating valve 2 includes a first regulating valve 21 and a second regulating valve 22 connected in parallel along the damping flow path. The damping of the hydraulic suspension system is adjusted by at least one of the first regulating valve 21 or the second regulating valve 22. An accumulator 14 is connected in series between the first regulating valve 21 and the second regulating valve 22. In this mode, the shock absorber 1 is in a compressed state, the motor 4 is stopped, the one-way pump 3 is not working, hydraulic fluid cannot flow through the one-way pump 3, and the second regulating valve 22 is open. In the first regulating valve 21, the oil can only flow through the second regulating valve 22 and not through the first regulating valve 21. At this time, the oil enters the damping flow path from the recovery chamber 13 through the first port of the damping flow path, and then enters the second regulating valve 22. After passing through the second regulating valve 22, the oil enters the accumulator 14 for energy storage. After passing through the accumulator 14, the oil enters the damping flow path again and enters the compression chamber 12 through the second port of the damping flow path, thus completing the circulation of the oil and realizing the adjustment of the damping of the hydraulic suspension system through the second regulating valve 22.

[0052] In this semi-active mode, the oil flows only through the second regulating valve 22, the first regulating valve 21 is closed, and the damping regulation is completed solely by the second regulating valve 22. The accumulator 14 is connected in series downstream of the second regulating valve 22 to stabilize the oil pressure fluctuations and buffer the energy, effectively reducing system pulsation and improving the stability of the damping response. Since the motor 4 is in a stopped state and the unidirectional pump 3 is completely isolated, the oil circulation does not require external power input, and the system energy consumption is significantly reduced. At the same time, the oil flows only through the valve path of the second regulating valve 22, avoiding the response delay and calibration complexity caused by multi-valve collaborative control, and improving control accuracy and system reliability.

[0053] Example 2

[0054] like Figure 2 The diagram shows a second flow pattern of hydraulic fluid in a semi-active mode of the hydraulic suspension system. Similarities to the embodiment are not repeated here, but the difference lies in this mode: the shock absorber 1 is in a recovery state, the second regulating valve 22 is closed, and the first regulating valve 21 is open. The hydraulic fluid can only flow through the first regulating valve 21, not the second regulating valve 22. At this time, the hydraulic fluid enters the damping flow path from the compression chamber 12 through the second port of the damping flow path, then enters the first regulating valve 21, and after passing through the first regulating valve 21, enters the accumulator 14 for energy storage. After passing through the accumulator 14, the hydraulic fluid re-enters the damping flow path and enters the recovery chamber 13 through the second port of the damping flow path, thus completing the hydraulic fluid circulation. This allows the damping magnitude of the hydraulic suspension system to be adjusted via the first regulating valve 21.

[0055] In this semi-active mode, the oil flows only through the first regulating valve 21, while the second regulating valve 22 is closed. Damping regulation is performed solely by the first regulating valve 21. The accumulator 14 is connected in series downstream of the first regulating valve 21 to stabilize and buffer the oil pressure fluctuations, effectively reducing system pulsation and improving the stability of the damping response. Since the motor 4 is in a stopped state and the unidirectional pump 3 is completely isolated, the oil circulation does not require external power input, significantly reducing system energy consumption. At the same time, the oil flows only through the path of the first regulating valve 21, avoiding the response delay and calibration complexity caused by multi-valve collaborative control, and improving control accuracy and system reliability.

[0056] Example 3

[0057] like Figure 3 The diagram shows the hydraulic fluid flow in a semi-active mode, with the electric motor 4 in a driving state and the shock absorber 1 in a compressed state. The hydraulic suspension system also includes a switching valve 5 and a solenoid valve 6 installed in the damping flow path. The switching valve 5 has a first connecting port 51, a second connecting port 52, a third connecting port 53, and a fourth connecting port 54. The third port of the damping flow path is connected to the first connecting port 51, the fourth port is connected to the fourth connecting port 54, the fifth port is connected to the third connecting port 53, and the sixth port is connected to the second connecting port 52. The switching valve 5 has a first switching state and a second switching state. When it is in the first switching state, the first connecting port 51 is connected to the third connecting port 53 and the second connecting port 52 is connected to the fourth connecting port 54. When it is in the second switching state, the first connecting port 51 is connected to the second connecting port 52 and the third connecting port 53 is connected to the fourth connecting port 54. In this mode, the switching valve 5 is in the first switching state and the solenoid valve 6 is in the open state. The solenoid valve 6 is connected in parallel with the regulating valve 2, the solenoid valve 6 is connected in series with the switching valve 5, and the switching valve 5 is connected in parallel with the regulating valve 2.

[0058] In this mode, the oil is divided into two paths. The first path is as follows: the oil flows out of the recovery chamber 13, enters the damping flow path through the first port of the damping flow path, then enters the second regulating valve 22, and after exiting the second regulating valve 22, it enters the accumulator 14 for energy storage. Then, the oil exiting the accumulator 14 re-enters the damping flow path and enters the compression chamber 12 through the second port of the damping flow path.

[0059] The second path is as follows: the oil flows out of the recovery chamber 13, enters the damping flow path through the first port of the damping flow path, then flows out through the fourth port of the damping flow path, and passes through the fourth connecting port 54 and the second connecting port 52 in sequence, and then enters the sixth port. After flowing through the one-way pump 3, and then through the third connecting port 53 and the first connecting port 51 in sequence, it flows back into the damping flow path from the third port of the damping flow path. After flowing through the switching solenoid valve 6, it flows back into the compression chamber 12 from the second port of the damping flow path. Because the oil can pass through the first path and the second path at the same time, the damping can be adjusted by the regulating valve 2 and the one-way pump 3.

[0060] In this mode, the oil circulates simultaneously through two parallel paths: the second regulating valve 22 and the one-way pump 3. The second regulating valve 22 provides basic damping, and the one-way pump 3 operates as a hydraulic motor driven by the electric motor 4. It utilizes the oil flow to drive its rotation and generate load damping, thereby achieving superimposed adjustment of damping force. The accumulator 14 stabilizes the oil pressure fluctuations in the two paths, reducing system pulsation. The solenoid valve 6 remains open to ensure the second path is unobstructed, allowing the pump's hydraulic motor function to participate in damping control. The system does not require active pressurization; it relies solely on the kinetic energy of the oil to drive the pump body for generator-type braking, achieving semi-active damping adjustment without external energy input, thus improving response speed and energy efficiency.

[0061] Example 4

[0062] The similarities with Example 3 will not be repeated here; the differences are as follows: Figure 4 As shown, when the hydraulic suspension system is in semi-active mode, the motor 4 is in driving mode, and the shock absorber 1 is in restoring mode, the switching valve 5 is in the second switching state, and the switching solenoid valve 6 is in the open state; in this mode, the oil is divided into two paths.

[0063] The first path is as follows: the oil flows out of the compression chamber 12, flows into the damping flow path through the second port of the damping flow path, then flows through the switch solenoid valve 6, and then sequentially through the third port of the damping flow path, the first connecting port 51, the second connecting port 52, the one-way pump 3, the third connecting port 53, the fourth connecting port 54, and finally enters the recovery chamber 13 through the first port of the damping flow path, so as to provide damping for the hydraulic suspension system through the one-way pump 3;

[0064] The second path is as follows: the oil flows out of the compression chamber 12, flows into the damping flow path through the second port of the damping flow path, and then enters the first regulating valve 21. After flowing out of the first regulating valve 21, it re-enters the damping flow path and then enters the recovery chamber 13 through the first port of the damping flow path, so as to provide damping for the hydraulic suspension system. At this time, because the oil can pass through the first path and the second path at the same time, the damping can be provided by the one-way pump 3 and the first regulating valve 21.

[0065] In this mode, the oil circulates simultaneously through two parallel paths: the first regulating valve 21 and the one-way pump 3. The first regulating valve 21 provides basic damping, and the one-way pump 3 operates as a hydraulic motor driven by the electric motor 4. It utilizes the oil flow to drive its rotation and generate load damping, thereby achieving superimposed adjustment of damping force. The accumulator 14 stabilizes the oil pressure fluctuations and reduces system pulsation. The solenoid valve 6 remains open to ensure the one-way pump 3 path is unobstructed, allowing the pump's hydraulic motor function to participate in the damping control of the recovery stroke. The system does not require active pressurization; it relies solely on the kinetic energy of the oil to drive the pump body for generator braking, achieving semi-active damping adjustment without external energy input, thus improving response speed and energy efficiency.

[0066] Example 5

[0067] The similarities between this embodiment and Embodiment 3 will not be repeated here. The differences are as follows: Figure 5 As shown, in this embodiment, the hydraulic suspension system is in active mode, and the motor 4 is always in driving mode. When the shock absorber 1 is in compression mode, the flow path of the oil is as follows: the oil flows out from the recovery chamber 13, enters the shock absorber flow path through the first port of the shock absorber flow path, and then flows into the compression chamber 12 through the second port of the shock absorber flow path in sequence through the fourth connecting port 54, the second connecting port 52, the one-way pump 3, the third connecting port 53, the first connecting port 51, and the switch solenoid valve 6. At this time, the regulating valve 2 does not participate in the work and does not allow the oil to pass through. The damping is adjusted by the active force provided by the one-way pump 3.

[0068] In this active mode, when the shock absorber 1 is in a compressed state, the oil circulates only through the active drive path of the one-way pump 3. The one-way pump 3, driven by the motor 4, pushes the oil from the recovery chamber 13 to the compression chamber 12 under high pressure, directly offsetting or overcoming the excitation force from the road surface, thus actively suppressing the movement of the shock absorber piston 11. The regulating valve 2 is completely closed, and the damping adjustment is completely controlled independently by the output pressure of the one-way pump 3, with no bypass leakage loss. The switching valve 5 is in the first switching state to ensure that the oil path is unobstructed, and the switching solenoid valve 6 remains open to ensure stable transmission of high-pressure oil. The system directly applies active force through the positive displacement of the one-way pump 3 to achieve high-precision, high-response real-time damping compensation, thereby improving vehicle stability and ride comfort.

[0069] Example 6

[0070] The similarities between this embodiment and Embodiment 3 will not be repeated here. The differences are as follows: Figure 6As shown, in this embodiment, the hydraulic suspension system is in active mode, and the motor 4 is always in driving mode. When the shock absorber 1 is in the recovery state, the flow path of the oil is as follows: the oil flows out from the compression chamber 12, enters the shock absorber flow path through the second port of the shock absorber flow path, and then flows into the recovery chamber 13 through the first port of the shock absorber flow path in sequence through the switching solenoid valve 6, the first connecting port 51, the second connecting port 52, the one-way pump 3, the third connecting port 53, and the fourth connecting port 54. At this time, the regulating valve 2 does not participate in the work and does not allow the oil to pass through. The damping is adjusted by the active force provided by the one-way pump 3.

[0071] In this active mode, the electric motor 4 continuously drives the one-way pump 3, and the oil circulates only through the one-way pump drive path. The regulating valve 2 is completely closed, and the damping adjustment is entirely provided by the one-way pump 3 to provide active pressure control. When the shock absorber 1 is compressed, the oil is pressurized from the recovery chamber 13 by the one-way pump 3 and directly injected into the compression chamber 12 to suppress the upward movement of the damping piston 11. When the shock absorber 1 is restored, the oil is pressurized from the compression chamber 12 by the one-way pump 3 and directly injected into the recovery chamber 13 to suppress the downward movement of the damping piston 11. In active mode, the one-way pump 3 acts as a hydraulic power source to realize real-time active intervention in the hydraulic suspension system. It has a fast response speed and high control precision. The system directly applies controllable force through the forward and reverse displacement of the one-way pump 3, which improves the vehicle body attitude control capability and driving stability.

[0072] Example 7

[0073] The similarities between this embodiment and Embodiment 3 will not be repeated here. The differences are as follows: Figure 7 As shown, in this embodiment, the hydraulic suspension system is in passive mode, the motor 4 is in a stopped state, and the shock absorber 1 is in a compressed state. In this mode, the flow path of the oil is as follows: the oil flows out from the recovery chamber 13, enters the damping flow path through the first port of the damping flow path, then flows through the second regulating valve 22 and enters the accumulator 14 for energy storage. The oil that comes out of the accumulator 14 re-enters the damping flow path and flows back to the compression chamber 12 through the second port of the damping flow path. In this mode, the one-way pump 3 does not work and does not allow the oil to pass through. The opening of the second regulating valve 22 is constant, thereby providing fixed damping through the second regulating valve 22.

[0074] In this passive mode, the motor 4 stops, the one-way pump 3 does not work, and the oil circulates only through the fixed passage formed by the second regulating valve 22 and the accumulator 14. The accumulator 14 stabilizes the oil pressure fluctuations and reduces system pulsation. The second regulating valve 22 maintains a constant opening to provide a stable and non-adjustable damping force. The system has no external energy input and no active control intervention. Its function is equivalent to a traditional passive suspension. It has a simple structure, high reliability, and is suitable for high-frequency, low-amplitude road conditions, reducing system energy consumption and control complexity.

[0075] Example 8

[0076] The similarities between this embodiment and Embodiment 3 will not be repeated here. The differences are as follows: Figure 8 As shown, in this embodiment, the hydraulic suspension system is in passive mode, the motor 4 is in a stopped state, and the shock absorber 1 is in a recovery state. In this mode, the flow path of the oil is as follows: the oil flows out from the compression chamber 12, enters the damping flow path through the second port of the damping flow path, then flows through the first regulating valve 21 and enters the accumulator 14 for energy storage. The oil that comes out of the accumulator 14 re-enters the damping flow path and flows back to the recovery chamber 13 through the first port of the damping flow path. In this mode, the one-way pump 3 does not work and does not allow the oil to pass through. The opening of the first regulating valve 21 is constant, thereby providing fixed damping through the first regulating valve 21.

[0077] In this passive mode, the motor 4 stops, the one-way pump 3 does not work, and the oil circulates only through the fixed passage formed by the first regulating valve 21 and the accumulator 14. The accumulator 14 stabilizes the oil pressure fluctuations and reduces system pulsation. The first regulating valve 21 maintains a constant opening to provide a stable and non-adjustable damping force. The system has no external energy input and no active control intervention. Its function is equivalent to a traditional passive suspension, which is suitable for high-frequency, low-amplitude road conditions and reduces system energy consumption and control complexity.

[0078] Example 9

[0079] The similarities between this embodiment and Embodiment 3 will not be repeated here. The differences are as follows: Figure 9 As shown, in this embodiment, the hydraulic suspension system is in passive mode, the electric motor 4 is in driving mode, the one-way pump 3 is working, and the shock absorber 1 is in compression mode.

[0080] In this mode, the oil flows through two paths. The first path is as follows: the oil flows out of the recovery chamber 13, enters the damping flow path through the first port of the damping flow path, then flows out through the fourth port of the damping flow path, and passes through the fourth connecting port 54 and the second connecting port 52 in sequence, and then enters the sixth port. After flowing through the one-way pump 3, and then through the third connecting port 53 and the first connecting port 51 in sequence, it flows back into the damping flow path from the third port of the damping flow path. After flowing through the switching solenoid valve 6, it flows back into the compression chamber 12 from the second port of the damping flow path. At this time, the damping is adjusted by the one-way pump 3.

[0081] The second path is as follows: the oil flows out of the recovery chamber 13, enters the damping flow path through the first port of the damping flow path, then enters the second regulating valve 22, exits from the second regulating valve 22 and enters the accumulator 14 for energy storage, and then exits from the accumulator 14 and re-enters the damping flow path, and enters the compression chamber 12 through the second port of the damping flow path. The opening of the second regulating valve 22 is constant. In this path, the second regulating valve 22 provides fixed damping. At this time, because the oil can pass through the first path and the second path at the same time, the unidirectional pump 3 and the second regulating valve 22 can jointly provide damping.

[0082] In this passive mode, the electric motor 4 drives the unidirectional pump 3 to operate. The unidirectional pump 3 works as a hydraulic motor. When the oil flows through the unidirectional pump 3 via the first path, it drives the pump to rotate and generates constant load damping. At the same time, the oil in the second path forms a pressure-stabilizing cycle with the accumulator 14 through the second regulating valve 22 with a constant opening, providing basic damping. The two paths operate in parallel. The power generation damping of the unidirectional pump 3 and the fixed throttling damping of the second regulating valve 22 work together to achieve a composite passive damping characteristic composed of mechanical load and throttling resistance. Under the premise of no active pressure output, the system stabilizes the damping output by generating electricity through the reverse drag of the unidirectional pump 3, improving damping consistency and energy recovery efficiency. At the same time, the accumulator 14 effectively suppresses pressure fluctuations and ensures stable system operation.

[0083] Example 10

[0084] The similarities between this embodiment and Embodiment 3 will not be repeated here. The differences are as follows: Figure 10 As shown, in this embodiment, the hydraulic suspension system is in passive mode, the electric motor 4 is in driving mode, the one-way pump 3 is working, and the shock absorber 1 is in restoring mode.

[0085] In this mode, the oil flows through two paths. The first path is as follows: the oil flows out of the compression chamber 12, enters the damping flow path through the second port of the damping flow path, then flows through the switching solenoid valve 6, and then sequentially passes through the third port of the damping flow path, the first connecting port 51, the second connecting port 52, the one-way pump 3, the third connecting port 53, and the fourth connecting port 54 before entering the recovery chamber 13 through the first port of the damping flow path. This allows the damping of the hydraulic suspension system to be adjusted by the one-way pump 3 and the regulating valve 2. At this time, the one-way pump 3 provides the damping.

[0086] The second path is as follows: the oil flows out of the compression chamber 12, flows into the damping flow path through the second port of the damping flow path, and then enters the first regulating valve 21. After flowing out of the first regulating valve 21, it re-enters the damping flow path and then enters the recovery chamber 13 through the first port of the damping flow path, so as to realize the damping of the hydraulic suspension system through the first regulating valve 21. At this time, because the oil can pass through the first path and the second path at the same time, the damping can be provided by the one-way pump 3 and the first regulating valve 21.

[0087] In this passive mode, the electric motor 4 drives the unidirectional pump 3 to operate. The unidirectional pump 3 works as a hydraulic motor. When the oil flows through the unidirectional pump 3 via the first path, it drives the pump to rotate and generates constant load damping. At the same time, the oil in the second path is directly throttled through the first regulating valve 21 with a constant opening, providing basic damping. The two paths operate in parallel. The generating damping of the unidirectional pump 3 and the fixed throttling damping of the first regulating valve 21 work together to achieve a composite passive damping characteristic composed of mechanical load and throttling resistance. Under the premise of no active pressure output, the system stabilizes the damping output by generating electricity through the reverse drag of the unidirectional pump 3, improving damping consistency and energy recovery efficiency, while ensuring a smooth and reliable damping response during the recovery stroke.

[0088] According to an embodiment of this application, an embodiment of a suspension system control method is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0089] This embodiment provides a suspension system control method. Figure 11 This is a flowchart of a suspension system control method according to an embodiment of this application, such as... Figure 11 As shown, the process includes the following steps:

[0090] S1. Obtain the road excitation frequency experienced by the vehicle's suspension system;

[0091] S2. Determine the operating mode of the suspension system based on the road surface excitation frequency and mark it as the target mode. The operating mode includes any one of active mode, semi-active mode, and passive mode; drive the suspension system to operate according to the target mode. Alternatively,

[0092] The operation feedback mode is formed in response to the user's touch operation. The operation feedback mode includes standard mode, comfort mode, sports mode and energy saving mode.

[0093] Based on the correspondence between the operation feedback mode and the working mode, determine the working mode corresponding to the operation feedback mode and mark it as the target mode.

[0094] The central control unit continuously monitors the road excitation frequency experienced by the suspension system during vehicle operation using sensors installed inside or outside the vehicle. These sensors include, but are not limited to, accelerometers and travel sensors. Once the road excitation frequency experienced by the suspension system is detected, the corresponding operating mode is determined and marked as the target operating mode. For example, for low-frequency excitation (between 0Hz and 5Hz, such as rapid acceleration and deceleration), an active mode is used to provide better performance at the limit; for mid-frequency excitation (between 5Hz and 30Hz), a semi-active mode is used to ensure vehicle comfort; and for high-frequency excitation (greater than 30Hz), a passive mode is used to reduce energy consumption and provide basic damping functions.

[0095] The system also allows users to select operating feedback modes, including Standard, Comfort, Sport, and Eco modes, via the central display screen or control panel. Each of these operating feedback modes corresponds to a working mode. In Comfort or Standard mode, a semi-active mode is used to ensure vehicle comfort; in Eco mode, a passive mode is used to reduce energy consumption and provide basic damping; and in Sport mode, an active mode is used to provide better performance at the limit.

[0096] By collecting the road excitation frequency of the vehicle suspension system in real time and combining it with the operation feedback mode selected by the user through the central control unit, the system automatically matches and switches to the corresponding active mode, semi-active mode, or passive mode. When the road excitation frequency is between 0 and 5 Hz, the system enters active mode, and the one-way pump 3 provides active pressure to control the vehicle's attitude. When the frequency is between 5 and 30 Hz, the system enters semi-active mode, and the damping is adjusted in coordination with the power generation load of the one-way pump 3 through the opening of the regulating valve 2. When the frequency is higher than 30 Hz, the system enters passive mode, the one-way pump 3 stops or only acts as a hydraulic motor to provide fixed damping, and the regulating valve 2 maintains a constant opening. At the same time, the standard mode, comfort mode, sport mode, or energy-saving mode selected by the user is mapped to the semi-active mode, semi-active mode, active mode, or passive mode, respectively, to achieve dual mode decision-making based on dynamic response to road conditions and driving intention, thereby improving the system's response accuracy, energy consumption optimization, and driving experience consistency.

[0097] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties. Furthermore, the collection, use and processing of the relevant data must comply with the relevant laws, regulations and standards of the relevant countries and regions, and corresponding operation entry points are provided for users to choose to authorize or refuse.

[0098] According to an embodiment of this application, a device for controlling a suspension system is provided. It should be noted that the device can be used to execute the above-described suspension system control method. The device for controlling the suspension system includes an acquisition module and a drive module connected to each other. The acquisition module is configured to acquire the road excitation frequency received by the vehicle's suspension system. The drive module is configured to determine the operating mode of the suspension system based on the road excitation frequency and mark it as a target mode. The operating mode includes any one of an active mode, a semi-active mode, and a passive mode; and drive the suspension system to work according to the target mode.

[0099] Embodiments of this application also provide a vehicle, including: a memory storing an executable program; and a processor for running the program, wherein the program executes the methods described in various embodiments of this application when it runs.

[0100] Embodiments of this application also provide a computer-readable storage medium including a stored executable program, wherein, when the executable program is running, it controls the device where the computer-readable storage medium is located to perform the methods of various embodiments of this application.

[0101] Embodiments of this application also provide a computer program product, including a computer program that, when executed by a processor, implements the methods of various embodiments of this application.

[0102] Embodiments of this application also provide a computer program product, including a non-volatile computer-readable storage medium for storing a computer program that, when executed by a processor, implements the methods in various embodiments of this application.

[0103] Embodiments of this application also provide a computer program that, when executed by a processor, implements the methods described in the various embodiments of this application.

[0104] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0105] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0106] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0107] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0108] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, read-only memory (ROM), random access memory (RAM), portable hard drive, magnetic disk, or optical disk.

[0109] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A hydraulic suspension system suitable for vehicles, characterized in that, The system includes: The vibration damping flow path, the vibration damper (1) and the regulating valve (2) disposed on the vibration damping flow path, the connecting flow path and the one-way pump (3) disposed on the connecting flow path, wherein the vibration damping flow path may be selectively connected to the connecting flow path to form a vibration damping circuit or disconnected from at least one end of the connecting flow path; An electric motor (4) is connected to the one-way pump (3), and the electric motor (4) has a driving state and a stopping state; The hydraulic suspension system has an active mode, a semi-active mode, and a passive mode. When the hydraulic suspension system is in the active mode, the damping flow path is connected to the connecting flow path to form the damping circuit, and the motor (4) is in the driving state to drive the one-way pump (3) to rotate. When the hydraulic suspension system is in the semi-active mode, the damping flow path is connected to the connecting flow path to form the damping circuit, and the motor (4) is in the driving state, or the damping flow path is disconnected from the connecting flow path and the damping flow path is dynamically adjusted by the regulating valve (2). When the hydraulic suspension system is in the passive mode, the damping flow path is connected to the connecting flow path to form the damping circuit, the motor (4) is in the driving state, and the opening of the regulating valve (2) is limited to a fixed value, or the damping flow path is disconnected from the connecting flow path, and the opening of the regulating valve (2) is limited to a fixed value, and the motor (4) is in the stopped state.

2. The hydraulic suspension system according to claim 1, characterized in that, The regulating valve (2) includes a first regulating valve (21) and a second regulating valve (22) disposed on the damping flow path. The damper (1) has a compression state and a recovery state. The damper (1) includes a compression chamber (12) and a recovery chamber (13) with relatively variable volumes. When the hydraulic suspension system is in the semi-active mode and the motor (4) is in the shutdown state, when the damper (1) is in the compression state, the first port of the damping flow path is connected to the recovery chamber (13), the second port of the damping flow path is connected to the compression chamber (12), the second regulating valve (22) is in the open state, and the first regulating valve (21) is in the closed state, so that the oil flows from the recovery chamber (13) through the first port into the damping flow path, and flows through the second regulating valve (22) and then enters the compression chamber (12) through the second port.

3. The hydraulic suspension system according to claim 2, characterized in that, When the damper (1) is in the recovery state, the first regulating valve (21) is in the open state and the second regulating valve (22) is in the closed state, so that the oil flows from the compression chamber (12) through the second port into the damping flow path, and flows through the first regulating valve (21) and then enters the recovery chamber (13) through the first port.

4. The hydraulic suspension system according to claim 2, characterized in that, The hydraulic suspension system further includes a switching valve (5), which has a first connecting port (51), a second connecting port (52), a third connecting port (53), and a fourth connecting port (54). The third port of the damping flow path is connected to the first connecting port (51), the fourth port of the damping flow path is connected to the fourth connecting port (54), the fifth port of the connecting flow path is connected to the third connecting port (53), and the sixth port of the connecting flow path is connected to the second connecting port (52). The switching valve (5) has a first switching state and a second switching state. When it is in the first switching state, the first connecting port (51) is connected to the third connecting port (53). The second connection port (52) is connected to the fourth connection port (54). When in the second switching state, the first connection port (51) is connected to the second connection port (52), and the third connection port (53) is connected to the fourth connection port (54). When the damper (1) is in the compression state and the motor (4) is in the driving state, the switching valve (5) is in the first switching state. When the damper (1) is in the recovery state and the motor (4) is in the driving state, the switching valve (5) is in the second switching state. The switching valve (5) is connected in parallel with the regulating valve (2).

5. The hydraulic suspension system according to claim 4, characterized in that, The hydraulic suspension system also includes a switching solenoid valve (6), which is disposed on the damping flow path and relatively close to the third port. When the motor (4) is in the stopped state, the switching solenoid valve (6) is closed, and when the motor (4) is in the driven state, the switching solenoid valve (6) is open. The switching solenoid valve (6) is connected in parallel with the regulating valve (2), and the switching solenoid valve (6) is connected in series with the switching valve (5). And / or, when the hydraulic suspension system is in the active mode, the shock absorber (1) is in the compressed state, and the motor (4) is in the driven state, the regulating valve (2) is in the closed state, the switching valve (5) is in the first switching state, and the switching solenoid valve (6) is open.

6. The hydraulic suspension system according to claim 5, characterized in that, When the hydraulic suspension system is in the active mode, the shock absorber (1) is in the recovery state and the motor (4) is in the driving state, the regulating valve (2) is in the closed state, the switching valve (5) is in the second switching state, and the switching solenoid valve (6) is open; and / or, when the hydraulic suspension system is in the passive mode, the shock absorber (1) is in the compression state and the motor (4) is in the shutdown state, the opening of the second regulating valve (22) is constant, and the first regulating valve (21) is closed, so that the oil flows from the recovery chamber (13) through the first end into the damping flow path, and flows through the second regulating valve (22) and then enters the compression chamber (12) through the second end.

7. The hydraulic suspension system according to claim 4, characterized in that, When the hydraulic suspension system is in the passive mode, the shock absorber (1) is in the recovery state, and the motor (4) is in the shutdown state, the opening of the first regulating valve (21) is constant, and the second regulating valve (22) is in the open state, so that the oil flows from the compression chamber (12) through the second end into the damping flow path, and flows through the first regulating valve (21) and then through the first end into the recovery chamber (13); and / or, when the hydraulic suspension system is in the passive mode, the shock absorber (1) is in the compression state, and the motor (4) is in the driving state, the switching valve (5) is in the first switching state; and / or, when the hydraulic suspension system is in the passive mode, the shock absorber (1) is in the recovery state, and the motor (4) is in the driving state, the switching valve (5) is in the second switching state.

8. A suspension system control method, characterized in that, The control method is applicable to the hydraulic suspension system according to any one of claims 1 to 7, and the control method includes: Obtain the road excitation frequency experienced by the vehicle's suspension system; The operating mode of the suspension system is determined based on the road surface excitation frequency and marked as the target mode. The operating mode includes any one of active mode, semi-active mode and passive mode. The suspension system is driven to operate according to the target mode; and / or, The operation feedback mode is formed in response to the user's touch operation, and the operation feedback mode includes standard mode, comfort mode, sports mode and energy saving mode; Based on the correspondence between the operation feedback mode and the working mode, the working mode corresponding to the operation feedback mode is determined and marked as the target mode.

9. A vehicle, characterized in that, include: Memory, which stores executable programs; A processor for running the program, wherein the program, when running, performs the method of claim 8.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored executable program, wherein, when the executable program is executed, it controls the device on which the storage medium is located to perform the method of claim 8.

Images