Suspension system and vehicle

Abstract

The utility model discloses a suspension system and a vehicle. The suspension system includes a damper unit, an air spring unit, and a control valve. The damper unit includes a hydraulic cylinder, a hydraulic pump, and an accumulator. The hydraulic pump is connected with the hydraulic cylinder to pump hydraulic oil. The energy accumulator comprises an oil cavity and an energy accumulation air cavity which are arranged in a separated mode. The oil cavity is connected with the hydraulic cylinder. The air spring unit comprises an air spring and an air supply device. The air supply device is connected with a spring air cavity of the air spring to supply air to the spring air cavity. The air supply device is connected with the energy storage air cavity of the energy accumulator through a control valve in an on-off mode. Based on the scheme, the limitation of a traditional offline inflation scheme is reduced, and online inflation can be achieved by means of the air supply device in the suspension system. In addition, the pressure value of on-line inflation is changed from a traditional fixed value to be dynamically adjusted according to requirements, the response time of the shock absorber can be shortened, multiple self-adaptive active suspension modes can be provided by adjusting the air pressure of the energy accumulator in the later period of the vehicle, and the self-adaptive performance of the suspension is improved.

Description

Technical Field

[0001] This application relates to the field of suspension technology, specifically to a suspension system and a vehicle. Background Technology

[0002] Currently, active suspension accumulators on the market are pressurized by offline inflation, which requires external equipment to inflate the accumulators when the vehicle is stopped or under maintenance, which has certain limitations. Utility Model Content

[0003] In view of the above problems, this application provides a suspension system and a vehicle to improve the adaptive performance of the suspension system.

[0004] This application provides a suspension system including a shock absorber unit, an air spring unit, and a control valve. The shock absorber unit includes a hydraulic cylinder, a hydraulic pump, and an accumulator. The hydraulic pump is connected to the hydraulic cylinder to pump hydraulic oil. The accumulator includes a separately disposed oil chamber and an accumulator air chamber. The oil chamber is connected to the hydraulic cylinder. The air spring unit includes an air spring and an air supply device. The air supply device is connected to the air chamber of the air spring to supply air to the air chamber. The air supply device and the accumulator air chamber are connected on and off via a control valve.

[0005] This solution mitigates the limitations of traditional offline inflation methods to some extent, enabling online inflation via the air supply system within the suspension system. This improves convenience and reduces inflation costs. Furthermore, the online inflation pressure changes from a fixed value to a dynamically adjustable value, reducing shock absorber response time and performance. It also facilitates pressure calibration and testing of the accumulator, reducing testing time. Additionally, in later stages of vehicle operation, adjusting the accumulator pressure can provide various adaptive active suspension modes, thereby enhancing the suspension's adaptive performance.

[0006] In some embodiments, the suspension system has a first operating state and a second operating state. In the first operating state, a control valve connects the air supply device and the energy storage chamber; in the second operating state, the control valve disconnects the air supply device and the energy storage chamber.

[0007] Specifically, when it is necessary to increase the pressure of the accumulator, the suspension system is put into the first operating state via a control valve. In this state, the shock absorber unit and the air spring unit are connected, and the air supply device supplies air to pressurize the accumulator. When the pressure of the accumulator meets the requirements, the suspension system is put into the second operating state via the control valve. In this state, the shock absorber unit and the air spring unit are decoupled and operate independently. Switching between the first and second operating states of the suspension system can be achieved simply by controlling the control valve, making the solution simple and highly feasible.

[0008] In some embodiments, the gas supply device includes a gas storage tank. The gas storage tank stores gas.

[0009] The gas storage tank is pre-filled with gas. When the accumulator needs to be charged and pressurized, the gas storage tank supplies gas to the accumulator to achieve online charging, which has low charging cost.

[0010] In some embodiments, the gas supply device further includes an air pump. When the pressure value of the gas storage tank is greater than or equal to the pressure value required by the accumulator, the gas storage tank supplies gas to the accumulator in priority over the air pump.

[0011] Specifically, when it is necessary to supply gas to the accumulator for pressurization, the gas in the storage tank is used first, which is more energy-efficient. When the gas pressure in the storage tank is insufficient, the gas pump is then started to supply gas, which improves the reliability of the system.

[0012] In some embodiments, the air spring unit further includes an exhaust valve. The exhaust valve is connected to the spring chamber to exhaust air from the air spring. A control valve connects the energy storage chamber and the exhaust valve so that gas in the energy storage chamber is discharged through the exhaust valve to reduce the pressure of the energy storage unit.

[0013] Specifically, when it is necessary to reduce the pressure of the accumulator, the air passage between the accumulator chamber and the exhaust valve can be connected by a control valve, thereby reducing the pressure of the accumulator and improving the pressure adjustability of the accumulator.

[0014] In some embodiments, the control valve has a first valve port, a second valve port, and a third valve port. The first valve port is connected to an air pump. The second valve port is connected to an exhaust valve. The third valve port is connected to an accumulator.

[0015] Specifically, the control valve is configured to connect the first valve port to the third valve port, at which time the gas supply device is connected to the energy storage chamber to supply gas to the energy storage device; the control valve is also configured to connect the second valve port to the third valve port, and disconnect the first valve port from the third valve port, at which time the energy storage chamber is connected to the exhaust valve, the gas supply to the energy storage device is disconnected, and the energy storage device exhausts gas to the outside to relieve pressure.

[0016] In some embodiments, the hydraulic cylinder includes a cylinder body, a piston, and a piston rod. The piston divides the interior of the cylinder body into a rod-side chamber and a rodless chamber. The rodless chamber is fluidly connected to a first port of the hydraulic pump. The rod-side chamber is fluidly connected to a second port of the hydraulic pump.

[0017] Specifically, when the hydraulic pump drives hydraulic oil into the rodless chamber, the piston rod extends, which is the shock absorber stretching process. The vehicle's suspension is in a raised state, and the vehicle is raised. When the hydraulic pump drives hydraulic oil into the rod chamber, the piston rod retracts, which is the shock absorber compression process. The vehicle's suspension is in a contracted state, and the vehicle is lowered. Therefore, during vehicle operation, this can effectively improve vehicle stability and enhance the driving experience.

[0018] In some embodiments, the hydraulic pump includes a bidirectional hydraulic pump. The accumulator includes a first accumulator and a second accumulator. The first accumulator is connected to a first port of the hydraulic pump. The second accumulator is connected to a second port of the hydraulic pump. The third valve port includes a rodless chamber side valve port and a rod chamber side valve port. The rodless chamber side valve port is connected to the first accumulator. The rod chamber side valve port is connected to the second accumulator.

[0019] Specifically, the hydraulic pump can cause hydraulic oil to flow from the first port into the rod chamber. During this process, the oil chamber of the first accumulator can store hydraulic energy. The hydraulic pump can also cause hydraulic oil to flow from the second port into the rodless chamber. During this process, the oil chamber of the second accumulator can store hydraulic energy. In other words, by setting up two accumulators, hydraulic energy can be stored during the bidirectional pumping of hydraulic oil by the hydraulic pump, thus improving energy utilization.

[0020] In some embodiments, the hydraulic cylinder further includes a first chamber and a second chamber. A first end of the piston rod is located within the cylinder body. A second end of the piston rod is located outside the cylinder body. The first and second chambers extend within the piston rod along its length. The first end of the first chamber penetrates the side of the piston rod and communicates with the rod chamber; the second end of the first chamber penetrates the end face of the second end of the piston rod and is fluidly connected to a first port of the hydraulic pump. The first end of the second chamber penetrates the end face of the first end of the piston rod and communicates with the rodless chamber; the second end of the second chamber penetrates the end face of the second end of the piston rod and is fluidly connected to a second port of the hydraulic pump.

[0021] In existing shock absorbers, one end of the oil passage is located on the shock absorber cylinder wall, and the other end is located on the outside of the longitudinal beam, connected by an oil pipe in the middle. This design results in a large space occupation at the wheel end, making it prone to interference during vehicle operation and leading to low reliability. Based on this design, a cavity is created on the piston rod, which effectively reduces the space occupation at the wheel end and minimizes the aging and wear problems caused by prolonged use of the oil pipe.

[0022] A second aspect of this application provides a vehicle including the suspension system described above.

[0023] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of a suspension system according to some embodiments of this application.

[0026] Figure 2 This is a schematic diagram of the internal structure of a control valve according to some embodiments of this application.

[0027] The attached icons are numbered as follows:

[0028] 1. Hydraulic cylinder; 11. Cylinder body; 12. Piston rod; 13. First chamber; 14. Second chamber; 15. Piston.

[0029] 2. Hydraulic pump.

[0030] 3. Accumulator; 31. First accumulator; 32. Second accumulator.

[0031] 4. Air spring.

[0032] 5. Air pump.

[0033] 6. Control valve; 61. First valve port; 61a. Air pump valve port; 61b. Air tank valve port; 62. Second valve port; 63. Third valve port; 63a. Rodless chamber side valve port; 63b. Rod chamber side valve port; 64. Fourth valve port; 65. Valve body; 66. Valve chamber; 67. Solenoid valve.

[0034] 7. Exhaust valve.

[0035] 8. Continuously damped control solenoid valve.

[0036] 9. Gas storage tank. Detailed Implementation

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0038] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0039] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0040] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0041] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0042] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0043] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0044] With the rapid development of vehicle technology, air suspension, as an advanced vehicle suspension technology, achieves dynamic adjustment of vehicle height and stiffness through precise control of air pressure. Compared with conventional suspension, it has many advantages.

[0045] Currently, the accumulators of active suspension systems on the market are pressurized by offline inflation. First, pressurization requires the factory to provide additional workstations, personnel, and equipment. Second, the online inflation pressure is a fixed value, and once inflation is complete, it cannot be dynamically adjusted on the vehicle body, making the adjustment operation troublesome during the vehicle debugging stage. In the later stage of vehicle use, it cannot adaptively adjust, thus limiting the expansion of active suspension functions.

[0046] refer to Figure 1 This application provides a suspension system in some embodiments, including a shock absorber unit, an air spring unit, and a control valve 6. The shock absorber unit includes a hydraulic cylinder 1, a hydraulic pump 2, and an accumulator 3. The hydraulic pump 2 is connected to the hydraulic cylinder 1 to pump hydraulic oil. The accumulator 3 includes a separately disposed oil chamber and an accumulator air chamber. The oil chamber is connected to the hydraulic cylinder 1. The air spring unit includes an air spring 4 and an air supply device. The air supply device is connected to the air chamber of the air spring 4 to supply air to the air chamber. The air supply device and the accumulator air chamber of the accumulator 3 are connected on and off via the control valve 6.

[0047] Specifically, by setting control valve 6, the shock absorber unit and the air spring unit are associated. By operating control valve 6, the shock absorber unit and the air spring unit can be decoupled. At this time, the air supply device only supplies air to the air spring 4 to adjust the stiffness of the vehicle body. Furthermore, by operating control valve 6, the shock absorber unit and the air spring unit can be associated. At this time, the air passage between the air supply device and the energy storage chamber is connected. The air supply device can charge and pressurize the energy storage 3, so that the pressure of the energy storage 3 can be adjusted.

[0048] This solution mitigates the limitations of traditional offline inflation methods to some extent, enabling online inflation via the air supply device within the suspension system. This improves convenience and reduces inflation costs. Furthermore, the online inflation pressure changes from a fixed value to a dynamically adjustable value, reducing shock absorber response time and performance. It also facilitates pressure calibration and testing of the accumulator 3, reducing testing time. Additionally, in later stages of vehicle operation, adjusting the air pressure in the accumulator 3 can provide various adaptive active suspension modes, thereby enhancing the suspension's adaptive performance.

[0049] In some embodiments, the suspension system has a first operating state and a second operating state. In the first operating state, control valve 6 connects the air supply device and the energy storage chamber. In the second operating state, control valve 6 disconnects the air supply device and the energy storage chamber.

[0050] Specifically, when it is necessary to increase the pressure of the accumulator 3, the suspension system is put into the first operating state via control valve 6. In this state, the shock absorber unit and the air spring unit are connected, and the air supply device supplies air to pressurize the accumulator 3. When the pressure of the accumulator 3 meets the requirements, the suspension system is put into the second operating state via control valve 6. In this state, the shock absorber unit and the air spring unit are decoupled and operate independently. Switching between the first and second operating states of the suspension system can be achieved simply by controlling control valve 6; the solution is simple and highly feasible.

[0051] In some embodiments, the suspension system further includes a pressure sensor (not shown in the figure), which is installed in the accumulator 3 to obtain the pressure of the accumulator 3 in real time, thereby cooperating with the control valve 6 to achieve intelligent control and supply air to the accumulator 3 in a timely manner.

[0052] In some embodiments, the gas supply device includes a gas storage tank 9. The gas storage tank 9 stores gas. The gas storage tank 9 is pre-filled with gas, and when the accumulator 3 needs to be charged and pressurized, the gas storage tank 9 supplies gas to the accumulator 3 to achieve online charging with low charging cost.

[0053] In some embodiments, the gas supply device further includes an air pump 5. When the pressure value of the gas storage tank 9 is greater than or equal to the pressure value required by the accumulator 3, the gas storage tank 9 supplies gas to the accumulator 3 in priority over the air pump 5.

[0054] Specifically, when it is necessary to supply gas to the accumulator 3 for pressurization, the gas in the gas storage tank 9 is used first, which is more energy-efficient. When the gas pressure in the gas storage tank 9 is insufficient, the gas pump 5 is started to supply gas, which improves the reliability of the system.

[0055] In some embodiments, the air spring unit further includes an exhaust valve 7. The exhaust valve 7 is connected to the spring air chamber to exhaust air from the air spring 4. The control valve 6 connects the energy storage chamber and the exhaust valve 7 so that the gas in the energy storage chamber is discharged through the exhaust valve 7 to reduce the pressure of the energy accumulator 3.

[0056] Specifically, when it is necessary to reduce the pressure of the accumulator 3, the air passage between the accumulator chamber and the exhaust valve 7 can be connected by the control valve 6, thereby reducing the pressure of the accumulator 3 and improving the pressure adjustability of the accumulator 3.

[0057] To further enhance controllability, the suspension system also includes an electromagnetic on / off valve located between the accumulator 3 and the control valve 6. When it is not necessary to pressurize or depressurize the accumulator 3, the electromagnetic on / off valve is controlled to disconnect, thereby disconnecting the accumulator chamber from the control valve 6. In this way, even if the control valve 6 is accidentally connected, the accumulator chamber will not be affected by external interference, thus improving the reliability of the system.

[0058] In some embodiments, the control valve 6 has a first valve port 61, a second valve port 62, and a third valve port 63. The first valve port 61 is connected to the air pump 5. The second valve port 62 is connected to the exhaust valve 7. The third valve port 63 is connected to the accumulator 3.

[0059] Specifically, the control valve 6 is configured to connect the first valve port 61 with the third valve port 63, at which time the gas supply device is connected to the energy storage chamber to supply gas to the energy storage unit 3; the control valve 6 is also configured to connect the second valve port 62 with the third valve port 63, and disconnect the first valve port 61 from the third valve port 63, at which time the energy storage chamber is connected to the exhaust valve 7, the gas supply to the energy storage unit 3 is disconnected, and the energy storage unit 3 exhausts gas to the outside to relieve pressure.

[0060] In some embodiments, the hydraulic cylinder 1 includes a cylinder body 11, a piston 15, and a piston rod 12. The piston 15 divides the inner cavity of the cylinder body 11 into a rod chamber and a rodless chamber. The rodless chamber is fluidly connected to a first port of the hydraulic pump 2. The rod chamber is fluidly connected to a second port of the hydraulic pump 2.

[0061] Specifically, when hydraulic pump 2 drives hydraulic oil into the rodless chamber, piston rod 12 extends. This process is the shock absorber stretching process, and the vehicle's suspension is in a raised state, causing the vehicle to rise. When hydraulic pump 2 drives hydraulic oil into the rod chamber, piston rod 12 retracts. This process is the shock absorber compression process, and the vehicle's suspension is in a contracted state, causing the vehicle to lower. Therefore, during vehicle operation, this effectively improves vehicle stability and enhances the driving experience.

[0062] In some embodiments, the hydraulic pump 2 includes a bidirectional hydraulic pump. The accumulator 3 includes a first accumulator 31 and a second accumulator 32. The first accumulator 31 is connected to a first port of the hydraulic pump 2. The second accumulator 32 is connected to a second port of the hydraulic pump 2. The third valve port 63 includes a rodless chamber side valve port 63a and a rod chamber side valve port 63b. The rodless chamber side valve port 63a is connected to the first accumulator 31. The rod chamber side valve port 63b is connected to the second accumulator 32.

[0063] Specifically, hydraulic pump 2 can allow hydraulic oil to flow from the first port into the rod chamber. During this process, the oil chamber of the first accumulator 31 can store hydraulic energy. Hydraulic pump 2 can also allow hydraulic oil to flow from the second port into the rodless chamber. During this process, the oil chamber of the second accumulator 32 can store hydraulic energy. In other words, by setting two accumulators, hydraulic pump 2 can store hydraulic energy during both bidirectional pumping of hydraulic oil, thus improving energy utilization efficiency.

[0064] refer to Figure 2In some embodiments, the control valve 6 includes a valve body 65, a valve cavity 66 disposed within the valve body 65, and a solenoid valve 67 disposed at the outlet of each valve port. First valve ports 61 to fourth valve ports 64 are spaced apart on the valve body 65, and each valve port communicates with the valve cavity 66. The solenoid valve 67 is used to open or close the valve port.

[0065] For example, if the solenoid valves at the first valve port 61 and the fourth valve port 64 are open, and the solenoid valves at the other valve ports are closed, then the gas output by the gas supply device enters the valve chamber 66 from the first valve port 61 and flows to the air spring 4 through the fourth valve port 64.

[0066] The connection principle between the various valve ports of control valve 6 is as described above, and will not be repeated here.

[0067] refer to Figure 2 In some embodiments, the first valve port 61 includes an air pump valve port 61a and an air tank valve port 61b. That is, the air pump 5 and the air tank 9 supply air to the valve chamber 66 through two different valve ports.

[0068] Of course, it is also possible to supply air to valve chamber 66 through the same valve port by air pump 5 and air tank 9 (e.g.) Figure 1 As shown in the image, you can configure it as needed.

[0069] In some embodiments, the hydraulic cylinder 1 further includes a first cavity 13 and a second cavity 14. A first end of the piston rod 12 is located inside the cylinder body 11. A second end of the piston rod 12 is located outside the cylinder body 11. The first cavity 13 and the second cavity 14 extend within the piston rod 12 along its length, with the first end of the first cavity 13 penetrating the side of the piston rod 12 and communicating with the rod chamber. The second end of the first cavity 13 penetrates the end face of the second end of the piston rod 12 and is fluidly connected to the first port of the hydraulic pump 2. The first end of the second cavity 14 penetrates the end face of the first end of the piston rod 12 and communicates with the rodless chamber. The second end of the second cavity 14 penetrates the end face of the second end of the piston rod 12 and is fluidly connected to the second port of the hydraulic pump 2.

[0070] Specifically, when the piston rod 12 needs to extend, the hydraulic pump 2 causes the hydraulic oil in the rod chamber to flow through the first end and the second end of the first passage 13 to the first port of the hydraulic pump 2, and then out through the second port of the hydraulic pump 2, passing through the second end and the first end of the second passage 14 to enter the rodless chamber. The increased oil volume in the rodless chamber pushes the piston 15 towards the rod chamber side. Conversely, when the piston rod 12 needs to retract, the hydraulic pump 2 causes the hydraulic oil in the rodless chamber to flow through the first end and the second end of the second passage 14 to the second port of the hydraulic pump 2, and then out through the first port of the hydraulic pump 2, passing through the second end and the first end of the first passage 13 to enter the rod chamber. The increased oil volume in the rod chamber pushes the piston 15 towards the rodless chamber side.

[0071] In existing shock absorbers, one end of the oil passage is located on the shock absorber cylinder wall, and the other end is located on the outside of the longitudinal beam, connected by an oil pipe in the middle. This design results in a large space occupation at the wheel end, which can easily lead to interference during vehicle operation and reduces reliability. In this embodiment, a cavity is created on the piston rod 12, which effectively reduces the space occupation at the wheel end and minimizes the aging and wear problems caused by prolonged use of the oil pipe.

[0072] In some embodiments, the shock absorber unit further includes two continuous damping control solenoid valves (i.e., CDC solenoid valves) 8, which are respectively disposed on the pipeline between the first chamber 13 and the first oil port of the hydraulic pump 2, and on the pipeline between the second chamber 14 and the second oil port of the hydraulic pump 2. The continuous damping control solenoid valves 8 can dynamically adjust the suspension damping by changing the flow resistance of the hydraulic fluid, thereby improving the vehicle's handling and comfort.

[0073] This application also provides a vehicle including the suspension system described above. Using the suspension system provided by this application can significantly improve the driving experience of the vehicle.

[0074] The following is combined Figure 1 and 2 This application describes in detail a specific embodiment of a suspension system.

[0075] refer to Figure 1 The suspension system includes a shock absorber unit, an air spring unit, and a control valve 6. The shock absorber unit includes a hydraulic cylinder 1, a hydraulic pump 2, a first accumulator 31, and a second accumulator 32. The air spring unit includes an air spring 4, an air tank 9, an air pump 5, and an exhaust valve 7.

[0076] refer to Figure 2 The control valve 6 includes a valve body 65, a valve chamber 66, a solenoid valve 67, a first valve port 61, a second valve port 62, a third valve port 63, and a fourth valve port 64. Each valve port 63 communicates with the valve chamber 66. The solenoid valve 67 is located at each valve port; when the solenoid valve 67 is open, the valve port is open; when the solenoid valve 67 is closed, the valve port is closed. The first valve port 61 includes an air pump valve port 61a and an air tank valve port 61b. The third valve port 63 includes a rodless chamber-side valve port 63a and a rod-side valve port 63b.

[0077] When the pressure of accumulator 3 needs to be increased, if the pressure in the gas tank 9 meets the pressure requirement of accumulator 3, the solenoid valves at the gas tank valve port 61b, the rodless chamber side valve port 63a, and the rod chamber side valve port 63b are opened. Other gas in the gas tank 9 enters the valve chamber 66 and flows into the energy storage chambers of the first accumulator 31 and the second accumulator 32 respectively. After the pressure of the two accumulators meets the requirements, the solenoid valves at the gas tank valve port 61b, the rodless chamber side valve port 63a, and the rod chamber side valve port 63b are closed.

[0078] If the pressure in the gas storage tank 9 does not meet the pressure requirements of the accumulator 3, the solenoid valves at the gas pump valve port 61a, gas tank valve port 61b, rodless chamber side valve port 63a, and rod chamber side valve port 63b are opened, so that the gas pump 5 and the gas storage tank 9 together supply gas to the first accumulator 31 and the second accumulator 32.

[0079] When it is necessary to reduce the pressure of accumulator 3, the solenoid valves at the rodless chamber side valve port 63a, the rod chamber side valve port 63b, and the second valve port 62 are opened. The gas in the energy storage chambers of the first accumulator 31 and the second accumulator 32 enters the valve chamber 66 through the rodless chamber side valve port 63a and the rod chamber side valve port 63b, respectively, and is discharged to the exhaust valve 7 through the second valve port 62 to complete the exhaust and pressure relief.

[0080] When the pressure of the accumulator 3 meets the requirements and the air spring 4 needs to be vented to adjust the suspension stiffness, the solenoid valves at the second valve port 62 and the fourth valve port 64 are opened, and the gas in the spring air chamber of the air spring 4 is discharged through the fourth valve port 64, the valve chamber 66, the second valve port 62 and the exhaust valve 7.

[0081] Hydraulic cylinder 1 includes a cylinder body 11, a piston rod 12, a piston 15, a first chamber 13, and a second chamber 14. The piston 15 divides the inner cavity of the cylinder body 11 into a rod chamber and a rodless chamber. The rodless chamber is fluidly connected to the first port of the hydraulic pump 2. The rod chamber is fluidly connected to the second port of the hydraulic pump 2. The first end of the piston rod 12 is located inside the cylinder body 11. The second end of the piston rod 12 is located outside the cylinder body 11. The first chamber 13 and the second chamber 14 extend along the length of the piston rod 12 within the piston rod 12, with the first end of the first chamber 13 penetrating the side of the piston rod 12 and communicating with the rod chamber. The second end of the first chamber 13 penetrates the end face of the second end of the piston rod 12 and is fluidly connected to the first port of the hydraulic pump 2. The first end of the second chamber 14 penetrates the end face of the first end of the piston rod 12 and communicates with the rodless chamber. The second end of the second chamber 14 penetrates the end face of the second end of the piston rod 12 and is fluidly connected to the second port of the hydraulic pump 2.

[0082] When the piston rod 12 needs to extend, the hydraulic pump 2 causes the hydraulic oil in the rod chamber to flow through the first end of the first chamber 13 and the second end of the first chamber 13 to the first oil port of the hydraulic pump 2, and then out of the second oil port of the hydraulic pump 2. The oil then flows through the second end of the second chamber 14 and the first end of the second chamber 14 into the rodless chamber. The increase in oil in the rodless chamber pushes the piston 15 to move toward the rod chamber side.

[0083] Conversely, when the piston rod 12 needs to retract, the hydraulic pump 2 causes the hydraulic oil in the rodless chamber to flow through the first end of the second chamber 14 and the second end of the second chamber 14 to the second oil port of the hydraulic pump 2, and then out of the first oil port of the hydraulic pump 2, through the second end of the first chamber 13 and the first end of the first chamber 13 to enter the rod chamber. The increase in oil in the rod chamber pushes the piston 15 to move towards the rodless chamber side.

[0084] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A suspension system, characterized in that, include: The shock absorber unit includes a hydraulic cylinder (1), a hydraulic pump (2) and an accumulator (3). The hydraulic pump (2) is connected to the hydraulic cylinder (1) to pump hydraulic oil. The accumulator (3) includes an oil chamber and an accumulator gas chamber that are separated from each other. The oil chamber is connected to the hydraulic cylinder (1). An air spring unit includes an air spring (4) and an air supply device, wherein the air supply device is connected to the air chamber of the air spring (4) to supply air to the air chamber; and The control valve (6) allows the gas supply device and the energy storage chamber of the accumulator (3) to be connected on and off.

2. The suspension system according to claim 1, characterized in that, The suspension system has a first working state and a second working state. In the first working state, the control valve (6) connects the air supply device and the energy storage chamber. In the second working state, the control valve (6) disconnects the air supply device and the energy storage chamber.

3. The suspension system according to claim 1, characterized in that, The gas supply device includes a gas storage tank (9) which stores gas.

4. The suspension system according to claim 3, characterized in that, The gas supply device also includes an air pump (5). When the pressure value of the gas storage tank (9) is greater than or equal to the pressure value required by the accumulator (3), the gas storage tank (9) supplies gas to the accumulator (3) in priority over the air pump (5).

5. The suspension system according to claim 1, characterized in that, The air spring unit also includes an exhaust valve (7), which is connected to the spring air chamber to exhaust the air spring (4). The control valve (6) connects the energy storage chamber to the exhaust valve (7) so that the gas in the energy storage chamber is discharged through the exhaust valve (7) to reduce the pressure of the energy storage unit (3).

6. The suspension system according to claim 2, characterized in that, The gas supply device also includes an air pump (5), the air spring unit also includes an exhaust valve (7), the control valve (6) has a first valve port (61), a second valve port (62) and a third valve port (63), the first valve port (61) is connected to the air pump (5), the second valve port (62) is connected to the exhaust valve (7), and the third valve port (63) is connected to the accumulator (3).

7. The suspension system according to claim 1, characterized in that, The hydraulic cylinder (1) includes a cylinder body (11), a piston (15) and a piston rod (12). The piston (15) divides the inner cavity of the cylinder body (11) into a rod chamber and a rodless chamber. The rodless chamber is fluidly connected to the first port of the hydraulic pump (2), and the rod chamber is fluidly connected to the second port of the hydraulic pump (2).

8. The suspension system according to claim 7, characterized in that, The control valve (6) has a first valve port (61), a second valve port (62) and a third valve port (63). The hydraulic pump includes a bidirectional hydraulic pump. The accumulator (3) includes a first accumulator (31) and a second accumulator (32). The first accumulator (31) is connected to the first oil port of the hydraulic pump (2), and the second accumulator (32) is connected to the second oil port of the hydraulic pump (2). The third valve port (63) includes a rodless chamber side valve port (63a) and a rod chamber side valve port (63b). The rodless chamber side valve port (63a) is connected to the first accumulator (31), and the rod chamber side valve port (63b) is connected to the second accumulator (32).

9. The suspension system according to claim 7, characterized in that, The hydraulic cylinder (1) further includes a first cavity (13) and a second cavity (14). The first end of the piston rod (12) is located inside the cylinder body (11), and the second end of the piston rod (12) is located outside the cylinder body (11). The first cavity (13) and the second cavity (14) extend inside the piston rod (12) along the length direction of the piston rod (12). The first end of the first cavity (13) penetrates the side of the piston rod (12) and communicates with the rod chamber. The second end of the first cavity (13) penetrates the end face of the second end of the piston rod (12) and is fluidly connected to the first port of the hydraulic pump (2). The first end of the second cavity (14) penetrates the end face of the first end of the piston rod (12) and communicates with the rodless chamber. The second end of the second cavity (14) penetrates the end face of the second end of the piston rod (12) and is fluidly connected to the second port of the hydraulic pump (2).

10. A vehicle, characterized in that, Includes the suspension system as described in any one of claims 1 to 9.

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