Hydro-pneumatic suspension system, vehicle, and control method of hydro-pneumatic suspension system

Abstract

The present invention discloses an oil-gas suspension system, a vehicle and a control method of the oil-gas suspension system. The oil-gas suspension system includes a hydraulic pump, at least two suspension cylinder groups corresponding to at least two axles of the vehicle and a control valve group. The control valve group is arranged between the hydraulic pump and the at least two suspension cylinder groups to control the action of the suspension cylinder groups. The control valve group includes a control valve block respectively arranged corresponding to each suspension cylinder in the suspension cylinder group to realize independent control of the suspension cylinder. The oil-gas suspension system of the present invention can independently control the suspension cylinder according to different road conditions by arranging a corresponding control valve block for each suspension cylinder, thereby improving the obstacle crossing performance of the oil-gas suspension system.

Description

Technical Field

[0001] The present invention relates to the technical field of suspension, and in particular to an oil-gas suspension system, a vehicle and a control method of the oil-gas suspension system. Background Art

[0002] The oil-gas suspension system has the advantages of height adjustability, rigidity support, anti-roll and good shock absorption, and its rigidity and damping have nonlinear characteristics. Therefore, vehicles using the oil-gas suspension system have driving comfort, strong stability, passability and off-road performance, and can travel in harsh working conditions such as deserts and swamps, as well as on rugged and inclined roads. Therefore, the oil-gas suspension system is widely used in special vehicles such as cranes, tanks and armored vehicles. Summary of the invention

[0003] The object of the present invention is to provide an oil-gas suspension system, a vehicle and a control method of the oil-gas suspension system, so as to improve the obstacle surmounting performance of the oil-gas suspension system.

[0004] A first aspect of the present invention provides an oil-gas suspension system, comprising:

[0005] Hydraulic pumps;

[0006] At least two suspension cylinder groups, arranged to correspond to at least two axles of the vehicle; and

[0007] The control valve group is arranged between the hydraulic pump and at least two suspension cylinder groups to control the action of the suspension cylinder groups. The control valve group includes control valve blocks respectively arranged corresponding to each suspension cylinder in the suspension cylinder group to realize independent control of the suspension cylinders.

[0008] In some embodiments, the control valve block has a first oil port, a second oil port, a third oil port and a fourth oil port, one of the first oil port and the second oil port is connected to the hydraulic pump, the other of the first oil port and the second oil port is connected to the oil tank, the third oil port is connected to the rod chamber of the suspension cylinder, the fourth oil port is connected to the rodless chamber of the suspension cylinder, and the control valve block includes a switch control valve for controlling whether the oil of the hydraulic pump flows to the suspension cylinder, and in the active adjustment state, the switch control valve controls the oil of the hydraulic pump to flow to the suspension cylinder; in the suspension elastic state and the suspension rigid state, the switch control valve prevents the oil of the hydraulic pump from flowing to the suspension cylinder.

[0009] In some embodiments, the switch control valve includes a first on-off control valve disposed between the first oil port and the third oil port and a second on-off control valve disposed between the second oil port and the fourth oil port.

[0010] In some embodiments, the first on-off control valve is a cone valve; and / or, the second on-off control valve is a cone valve.

[0011] In some embodiments, the control valve block includes an anti-roll control valve, which is used to control the connection between the rod chamber and the rodless chamber of the suspension cylinder when steering and the oil-gas suspension system is in a suspension elastic state.

[0012] In some embodiments, the suspension cylinder group also includes an accumulator arranged corresponding to the suspension cylinder, the anti-roll control valve includes a third on-off control valve and a fourth on-off control valve arranged on the oil circuit between the third oil port and the fourth oil port, and the oil port of the accumulator is connected to the oil circuit between the third on-off control valve and the fourth on-off control valve.

[0013] In some embodiments, when turning and the oil-gas suspension system is in a suspension elastic state, the third on-off control valve and the fourth on-off control valve are both in a connected state; when the oil-gas suspension system is in an active adjustment state, the third on-off control valve is in a disconnected state and the fourth on-off control valve is in a connected state so that the rodless chamber of the suspension cylinder is connected to the oil port of the accumulator.

[0014] In some embodiments, the control valve group further includes a main valve disposed between the hydraulic pump and the control valve block, and the main valve includes a reversing valve and a relief valve.

[0015] A second aspect of the present invention provides a vehicle, comprising the oil-gas suspension system as described in any one of the first aspect of the present invention.

[0016] A third aspect of the present invention provides a control method for controlling the oil-gas suspension system of the first aspect of the present invention, wherein the control valve block is independently operated to make the oil-gas suspension system enter a single suspension cylinder adjustment state.

[0017] In some embodiments, the control valve group also includes a main valve arranged between the hydraulic pump and the control valve block, and the main valve and the control valve block corresponding to the target suspension cylinder are operated to make the oil-gas suspension system enter a coaxial adjustment state, a same-side adjustment state, or an overall lifting and lowering adjustment state.

[0018] Based on the oil-gas suspension system, vehicle and control method of the oil-gas suspension system provided by the present invention, the oil-gas suspension system includes a hydraulic pump, at least two suspension cylinder groups corresponding to at least two axles of the vehicle, and a control valve group, the control valve group is arranged between the hydraulic pump and the at least two suspension cylinder groups to control the action of the suspension cylinder groups, and the control valve group includes a control valve block respectively arranged corresponding to each suspension cylinder in the suspension cylinder group to realize independent control of the suspension cylinder. The oil-gas suspension system of the present invention can independently control the suspension cylinder according to different road conditions by arranging a corresponding control valve block for each suspension cylinder, thereby improving the obstacle crossing performance of the oil-gas suspension system.

[0019] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0021] Figure 1 Schematic diagram of the structure of the oil-gas suspension system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0024] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0025] like Figure 1 As shown, the oil-gas suspension system of the embodiment of the present invention includes:

[0026] Hydraulic pump 1;

[0027] At least two suspension cylinder groups, arranged to correspond to at least two axles of the vehicle; and

[0028] The control valve group is arranged between the hydraulic pump 1 and at least two suspension cylinder groups to control the action of the suspension cylinder group. The control valve group includes a control valve block 3 respectively arranged corresponding to each suspension cylinder 4 in the suspension cylinder group to realize independent control of the suspension cylinder 4.

[0029] The oil-gas suspension system of the embodiment of the present invention provides a corresponding control valve block for each suspension cylinder so that the suspension cylinders can be independently controlled according to different road conditions, thereby improving the obstacle crossing performance of the oil-gas suspension system.

[0030] like Figure 1 As shown, the oil-gas suspension system of this embodiment includes three suspension cylinder groups. The three suspension cylinder groups are respectively arranged corresponding to the three axles of the vehicle. Specifically, the suspension cylinder group of this embodiment includes two cylinder groups respectively arranged on the left and right sides ( Figure 1 Two suspension cylinders (on the upper and lower sides).

[0031] The control valve block 3 of this embodiment has a first oil port P1, a second oil port P2, a third oil port P3 and a fourth oil port P4, one of the first oil port P1 and the second oil port P2 is connected to the hydraulic pump 1, the other of the first oil port P1 and the second oil port P2 is connected to the oil tank, the third oil port P3 is connected to the rod chamber of the suspension cylinder 4, and the fourth oil port P4 is connected to the rodless chamber of the suspension cylinder 4. The control valve block 3 includes a switch control valve for controlling whether the oil of the hydraulic pump 1 flows to the suspension cylinder 4. In the active adjustment state, the switch control valve controls the oil of the hydraulic pump to flow to the suspension cylinder 4; in the suspension elastic state and the suspension rigid state, the switch control valve prevents the oil of the hydraulic pump from flowing to the suspension cylinder 4.

[0032] Specifically, the switch control valve of this embodiment includes a first on-off control valve 31 disposed between the first oil port P1 and the third oil port P3 and a second on-off control valve 32 disposed between the second oil port P2 and the fourth oil port P4.

[0033] In the active adjustment state, the first on-off control valve 31 and the second on-off control valve 32 are both in a connected state so as to realize active control of the suspension cylinder.

[0034] When the oil-gas suspension system needs to be in a suspension rigid state, the first on-off control valve 31 and the second on-off control valve 32 of all control valve blocks 3 are controlled to be in an off state. At this time, the flow paths of the rod chamber and the rodless chamber of the suspension cylinder are disconnected to effectively realize the rigid locking of the vehicle suspension system.

[0035] In order to better realize the complete rigid locking of the vehicle suspension system, the first on-off control valve 31 of the present embodiment is a cone valve. The second on-off control valve 32 is a cone valve. Such an arrangement makes the internal leakage of the on-off control valve of the present embodiment extremely small.

[0036] like Figure 1 As shown, the control valve group of this embodiment further includes a main valve 2 arranged between the hydraulic pump 1 and the control valve block 3 , and the main valve 2 includes a reversing valve 21 and a relief valve 22 .

[0037] The first oil port A of the reversing valve 21 is connected to the oil outlet of the hydraulic pump 1, the second oil port B of the reversing valve 21 is connected to the oil tank, the third oil port C of the reversing valve 21 is connected to the first oil port P1 of the control valve block 3, and the fourth oil port D of the reversing valve 21 is connected to the second oil port P2 of the control valve block 3. The working position of the reversing valve 21 is switched to control the oil inlet to the rod chamber or the rodless chamber of the suspension cylinder 4.

[0038] In order to prevent the vehicle from rolling too much during steering, the control valve block 3 of this embodiment includes an anti-roll control valve, which is used to control the connection between the rod chamber and the rodless chamber of the suspension cylinder 4 when steering and the oil-gas suspension system is in the suspension elastic state.

[0039] Specifically, Figure 1 As shown, the suspension cylinder group of this embodiment further includes an accumulator 5 corresponding to the suspension cylinder 4, the anti-roll control valve includes a third on-off control valve 33 and a fourth on-off control valve 34 arranged on the oil circuit between the third oil port P3 and the fourth oil port P4, and the oil port of the accumulator 5 is connected to the oil circuit between the third on-off control valve 33 and the fourth on-off control valve 34. The first on-off control valve 31 and the second on-off control valve 32 of the control valve block 3 are both in the disconnected state and the third on-off control valve 33 and the fourth on-off control valve 34 are both in the connected state, at which time the rod chamber and the rodless chamber of the suspension cylinder 4 are connected and connected to the accumulator 5. If the vehicle turns while driving, the pressure in the rodless chamber of the suspension cylinder 4 increases, and the whole vehicle tends to lean to the left. At this time, since the rod chamber and the rodless chamber of the suspension cylinder 4 and the accumulator 5 are all connected, the pressure in the rod chamber of the suspension cylinder 4 and the accumulator 5 also increases. The accumulator 5 can absorb the instantaneous pressure, and the pressures of the suspension cylinder and the accumulator restore the dynamic balance, effectively reducing the tendency of the suspension cylinder to continue to lean to the left.

[0040] When the oil-gas suspension system of this embodiment is in an active adjustment state, the third on-off control valve 33 is in a disconnected state and the fourth on-off control valve is in a connected state so that the rodless chamber of the suspension cylinder is connected to the oil port of the accumulator 5 to store energy in the accumulator 5.

[0041] The control method of the oil-gas suspension system of this embodiment includes independently operating the control valve block to make the oil-gas suspension system enter a single suspension cylinder adjustment state.

[0042] Specifically, the action position change of the reversing valve 21 in the main valve 2 can be controlled to allow oil to flow into the rodless chamber of the suspension cylinder 4 to control the suspension cylinder to perform a lifting action or to flow oil into the rod chamber to perform an extension action.

[0043] The control method of this embodiment also includes operating the main valve 2 and the control valve block corresponding to the target suspension cylinder to make the oil-gas suspension system enter the coaxial adjustment state or the same-side adjustment state or the overall lifting adjustment state.

[0044] In the coaxial adjustment state, the control reversing valve 21 is in the left position and the first on-off control valve and the second on-off control valve of the two control valve blocks corresponding to one drive axle are both in a connected state, thereby realizing active lifting action of the suspension cylinders on the left and right sides of the drive axle; the control reversing valve 21 is in the right position and the first on-off control valve and the second on-off control valve of the two control valve blocks corresponding to one drive axle are both in a connected state, thereby realizing extension action of the suspension cylinders on the left and right sides of the drive axle.

[0045] In the same-side adjustment state, taking the left suspension cylinder as an example, the control reversing valve 21 is in the left position and the first on-off control valve and the second on-off control valve of all the control valve blocks corresponding to all the suspension cylinders on the left are in a connected state, thereby realizing the active lifting action of the suspension cylinders on the left; the control reversing valve 21 is in the right position and the first on-off control valve and the second on-off control valve of all the control valve blocks corresponding to all the suspension cylinders on the left are in a connected state, thereby realizing the extension action of the suspension cylinders on the left.

[0046] In the overall lifting and lowering adjustment state, similarly, as long as the first on-off control valve and the second on-off control valve of all the control valve blocks are in a connected state, the overall lifting and lowering adjustment of all the suspension cylinders of the vehicle can be achieved by controlling the reversing valve 21 to be in the left position or the right position.

[0047] In summary, the oil-gas suspension system of this embodiment can control the posture of the entire vehicle and the working state of the suspension according to different road conditions, thereby improving the driving performance and passability of the entire vehicle.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A hydro-pneumatic suspension system, characterized in that: include: Hydraulic pump (1); At least two suspension cylinder groups, used to be arranged corresponding to at least two axles of the vehicle; as well as a control valve group, arranged between the hydraulic pump (1) and the at least two suspension cylinder groups, for controlling the action of the suspension cylinder groups, the control valve group comprising a control valve block (3) respectively arranged corresponding to each of the suspension cylinders (4) in the suspension cylinder group, for realizing independent control of the suspension cylinders (4); The control valve block (3) has a first oil port (P1), a second oil port (P2), a third oil port (P3) and a fourth oil port (P4); one of the first oil port (P1) and the second oil port (P2) is connected to the hydraulic pump (1); the other of the first oil port (P1) and the second oil port (P2) is connected to the oil tank; the third oil port (P3) is connected to the rod chamber of the suspension cylinder (4); the fourth oil port (P4) is connected to the rodless chamber of the suspension cylinder (4); and the control valve block (3) includes a switch control valve for controlling whether the oil of the hydraulic pump (1) flows to the suspension cylinder (4); in an active adjustment state, the switch control valve controls the oil of the hydraulic pump to flow to the suspension cylinder (4); in a suspension elastic state and a suspension rigid state, the switch control valve prevents the oil of the hydraulic pump (1) from flowing to the suspension cylinder (4); The control valve block (3) comprises an anti-roll control valve, which is used to control the communication between the rod chamber and the rodless chamber of the suspension cylinder (4) when steering and the oil-gas suspension system is in the suspension elastic state.

2. The oil-gas suspension system according to claim 1, characterized in that: The switch control valve comprises a first on-off control valve (31) arranged between the first oil port (P1) and the third oil port (P3), and a second on-off control valve (32) arranged between the second oil port (P2) and the fourth oil port (P4).

3. The oil-gas suspension system according to claim 2, characterized in that: The first on-off control valve is a cone valve; and / or the second on-off control valve is a cone valve.

4. The oil-gas suspension system according to claim 1, characterized in that: The suspension cylinder group further comprises an accumulator (5) arranged corresponding to the suspension cylinder (4); the anti-roll control valve comprises a third on-off control valve (33) and a fourth on-off control valve (34) arranged on an oil circuit between the third oil port (P3) and the fourth oil port (P4); the oil port of the accumulator (5) is connected to the oil circuit between the third on-off control valve (33) and the fourth on-off control valve (34).

5. The oil-gas suspension system according to claim 4, characterized in that: When turning and the oil-gas suspension system is in the suspension elastic state, the third on-off control valve (33) and the fourth on-off control valve (34) are both in a connected state; when the oil-gas suspension system is in the active adjustment state, the third on-off control valve (33) is in a disconnected state and the fourth on-off control valve (34) is in a connected state so that the rodless chamber of the suspension cylinder is connected to the oil port of the accumulator (5).

6. The hydro-pneumatic suspension system according to any one of claims 1 to 5, characterized in that: The control valve group further comprises a main valve (2) arranged between the hydraulic pump (1) and the control valve block (3), wherein the main valve (2) comprises a reversing valve (21) and a relief valve (22).

7. A vehicle comprising the hydro-pneumatic suspension system according to any one of claims 1 to 6.

8. A method for controlling the oil-gas suspension system according to any one of claims 1 to 6, characterized in that: The control valve block is independently operated to make the oil-gas suspension system enter a single suspension cylinder adjustment state.

9. The control method according to claim 8, characterized in that: The control valve group further comprises a main valve (2) arranged between the hydraulic pump (1) and the control valve block (3), and the main valve and the control valve block corresponding to the target suspension cylinder are operated to enable the oil-gas suspension system to enter a coaxial adjustment state, a same-side adjustment state, or an overall lifting and lowering adjustment state.

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