Active hydraulic suspension system with double modes

Abstract

The utility model relates to the technical field of automobile suspension systems, in particular to an active hydraulic suspension system with double modes. The system comprises a hydraulic cylinder, a piston rod, a first one-way damping valve, a second one-way damping valve, a first energy accumulator, a second energy accumulator, a two-way pump, a fifth switch valve, a first switch valve, a second switch valve, a third switch valve and a fourth switch valve. The rod cavity, the first one-way damping valve, the two-way pump, the second one-way damping valve and the rodless cavity are sequentially connected through an oil way to form a fluid loop, the two ends of the third switch valve are connected with the two-way pump and the first energy accumulator respectively, and the two ends of the fourth switch valve are connected with the two-way pump and the second energy accumulator respectively. The first switch valve, the second switch valve and the fifth switch valve are all arranged on the oil way. The utility model effectively solves the technical problem that the suspension system in the prior art only has a semi-active mode or an active mode and cannot meet the requirements of diversified driving scenes.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile suspension system, especially to a kind of active hydraulic suspension system with double mode. BACKGROUND

[0002] Automobile suspension system is the important component of connecting wheel and vehicle body, its main function is to transfer the force and torque between wheel and frame, buffer the impact force of uneven road to frame or vehicle body, and attenuate the vibration caused thereby, to ensure that automobile can travel smoothly.Automobile suspension system can be divided into passive suspension, semi-active suspension and active suspension according to control form.Currently, mainstream vehicles mainly adopt one mode of semi-active suspension or active suspension.

[0003] For example, the patent document with the authorized announcement number CN221233413U discloses a kind of hydraulic semi-active suspension for vehicle, the suspension includes hydraulic shock absorber, the outer side wall of hydraulic shock absorber is slidably connected with moving ring, output shaft outer side wall is fixed with fixed ring, the lower of moving ring is fixed with circular ring, adjusting mechanism is equipped between circular ring and moving ring, first spring is fixed between moving ring and fixed ring, the position of moving ring is adjusted by adjusting mechanism, the pressure of first spring can be adjusted, to adapt to different road conditions.

[0004] For example, the patent document with the authorized announcement number CN221718265U discloses a kind of shock absorber and active suspension system, in the shock absorber of the suspension system, the piston of hydraulic cylinder divides cylinder cavity into rod cavity and rodless cavity, rod cavity, first one-way damping valve, first hydraulic pipeline, bidirectional pump, second hydraulic pipeline, second one-way damping valve and rodless cavity are sequentially connected to form fluid circuit, control valve is connected in parallel with bidirectional pump, first accumulator is in fluid communication with first hydraulic pipeline, second accumulator is in fluid communication with second hydraulic pipeline, control valve is used to control the flow of oil in first hydraulic pipeline and second hydraulic pipeline.The system injects oil into the rod cavity and rodless cavity of cylinder by bidirectional pump, thereby exerting active force on wheel and vehicle body to offset the body vibration caused by uneven road.

[0005] However, the scene faced by vehicle in actual driving is complex and various, different road conditions, driving style and vehicle load and other conditions have differentiated needs for the performance of suspension.Semi-active suspension can only adjust damping, cannot change stiffness, and cannot suppress roll when turning or off-road;Active suspension can adjust stiffness, but it relies on hydraulic system to work continuously, even in low load working condition, it also needs to maintain high power output, which is high in energy consumption and poor in economy. UTILITY MODEL CONTENT

[0006] The utility model provides a kind of active hydraulic suspension system with dual mode, to solve the technical problem that suspension system in prior art only has semi-active mode or active mode, cannot satisfy the diversified driving scene demand.

[0007] To solve the above problems, the active hydraulic suspension system with dual mode provided by the utility model adopts the following technical scheme:

[0008] An active hydraulic suspension system with dual mode, comprising: hydraulic cylinder, piston rod, first one-way damping valve, second one-way damping valve, first accumulator, second accumulator, bidirectional pump and fifth switch valve, hydraulic cylinder includes rod cavity containing piston rod and rodless cavity not containing piston rod, rod cavity, first one-way damping valve, bidirectional pump, second one-way damping valve and rodless cavity are sequentially connected to form fluid circuit by oil circuit;Further comprising: first switch valve, second switch valve, third switch valve and fourth switch valve;

[0009] The third switch valve is arranged on the oil circuit, and the two ends thereof are connected with the bidirectional pump and the first accumulator respectively, and the fourth switch valve is arranged on the oil circuit, and the two ends thereof are connected with the bidirectional pump and the second accumulator respectively;

[0010] The first switch valve is arranged on the oil circuit, and one end thereof is located between the bidirectional pump and the third switch valve, and the other end thereof is located between the rod cavity and the first one-way damping valve;

[0011] The second switch valve is arranged on the oil circuit, and one end thereof is located between the bidirectional pump and the fourth switch valve, and the other end thereof is located between the rodless cavity and the second one-way damping valve;

[0012] The fifth switch valve is arranged on the oil circuit, and one end thereof is located between the first accumulator and the third switch valve, and the other end thereof is located between the second accumulator and the fourth switch valve.

[0013] The active hydraulic suspension system with dual mode provided by the utility model has the beneficial effects that: the third switch valve with two ends connected with the bidirectional pump and the first accumulator respectively, the fourth switch valve with two ends connected with the bidirectional pump and the second accumulator respectively are arranged on the oil circuit, and the first switch valve, the second switch valve and the fifth switch valve are arranged on the oil circuit simultaneously;By controlling that five switch valves are all closed or the fifth switch valve is opened and the remaining switch valves are closed, the suspension system can be in semi-active mode, and the damping force and the elastic force are adjusted by using the damping valve and the accumulator to hinder the movement of the piston rod;By controlling that the third switch valve and the fourth switch valve are opened and the remaining switch valves are closed, or the first switch valve, the second switch valve and the fifth switch valve are opened and the remaining switch valves are closed, the suspension system can be in active mode, and the piston rod is driven to move to the direction of the rod cavity.

[0014] Through the above setting, the utility model possess two modes of semi-active mode and active mode, expand the applicable scene of suspension system, and semi-active mode and active mode all possess two different enable mode, two kinds of enable mode complement each other, form a kind of redundancy mechanism, can effectively guarantee the enablement of semi-active mode and active mode, improve the ride comfort and driving stability of vehicle, and the structure principle is simple, easy to realize, effectively solve the technical problem that the suspension system in the prior art only has semi-active mode or active mode, cannot satisfy the diversified driving scene demand.

[0015] Further, the oil circuit comprises a first oil section, a second oil section, a third oil section, a fourth oil section and a fifth oil section, the first oil section is used for connecting the rod cavity and the bidirectional pump, the second oil section is used for connecting the rodless cavity and the bidirectional pump, the first check valve, the first accumulator and the third switch valve are arranged on the first oil section, the second check valve, the second accumulator and the fourth switch valve are arranged on the second oil section, the first switch valve is arranged on the third oil section, the second switch valve is arranged on the fourth oil section, and the fifth switch valve is arranged on the fifth oil section.

[0016] Further, one end of the fifth oil section is connected with the first oil section and arranged between the first accumulator and the third switch valve, and the other end thereof is connected with the second oil section and arranged between the second accumulator and the fourth switch valve.

[0017] Further, both ends of the third oil section are connected with the first oil section, one end thereof is connected between the bidirectional pump and the third switch valve, and the other end thereof is connected between the rod cavity and the first check valve; both ends of the fourth oil section are connected with the first oil section, one end thereof is connected between the bidirectional pump and the fourth switch valve, and the other end thereof is connected between the rodless cavity and the second check valve.

[0018] Further, the first check valve comprises a first check valve and a first damper valve, and the second check valve comprises a second check valve and a second damper valve.

[0019] Further, the first damper valve and the second damper valve are electric control type damper valves.

[0020] Further, the bidirectional pump is a hydraulic bidirectional pump.

[0021] Further, the bidirectional pump is connected with a motor for driving the bidirectional pump.

[0022] Further, the first switch valve, the second switch valve, the third switch valve, the fourth switch valve and the fifth switch valve are electric control switch valves. BRIEF DESCRIPTION OF DRAWINGS

[0023] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description read in conjunction with the accompanying drawings, in which several embodiments of the present application are shown by way of example. In the drawings, the same or corresponding parts are denoted by the same or corresponding reference numerals, and:

[0024] Figure 1 Structure diagram of the active hydraulic suspension system with dual modes provided by the present application;

[0025] Figure 2 Structure diagram of the active hydraulic suspension system with dual modes provided by the present application in semi-active mode Figure 1 .

[0026] Figure 3 Structure diagram of the active hydraulic suspension system with dual modes provided by the present application in semi-active mode Figure 2 .

[0027] Figure 4 Structure diagram of the active hydraulic suspension system with dual modes provided by the present application in active mode Figure 1 .

[0028] Figure 2 Structure diagram of the active hydraulic suspension system with dual modes provided by the present application in active mode Figures 1 to 5 .

[0029] BRIEF DESCRIPTION OF DRAWINGS

[0030] 1, piston rod; 2, hydraulic cylinder; 3, first one-way damping valve; 4, second one-way damping valve; 5, first accumulator; 6, second accumulator; 7, bidirectional pump; 8, motor; 9, first on-off valve; 10, second on-off valve; 11, third on-off valve; 12, fourth on-off valve; 13, fifth on-off valve. DETAILED DESCRIPTION

[0031] The principles and spirits of the present application will be explained in detail below with reference to several representative embodiments of the present application.

[0032] Embodiments of the active hydraulic suspension system with dual modes provided by the present application:

[0033] As Figures 2 to 5As shown, the active hydraulic suspension system with dual modes comprises a hydraulic cylinder 2, a piston rod 1, a first one-way damping valve 3, a second one-way damping valve 4, a first accumulator 5, a second accumulator 6, a bidirectional pump 7, a first switch valve 9, a second switch valve 10, a third switch valve 11, a fourth switch valve 12 and a fifth switch valve 13. The piston rod 1 is slidably installed in the hydraulic cylinder 2, which divides the hydraulic cylinder 2 into a rod cavity containing the piston rod 1 and a rodless cavity not containing the piston rod 1. The rod cavity, the first one-way damping valve 3, the bidirectional pump 7, the second one-way damping valve 4 and the rodless cavity are connected in sequence by oil paths to form a fluid circuit; the rod cavity, the first switch valve 9, the bidirectional pump 7, the second switch valve 10 and the rodless cavity are connected in sequence by oil paths to form a fluid circuit.

[0034] The specific composition of the oil path is introduced below. The oil path comprises a first oil section, a second oil section, a third oil section, a fourth oil section and a fifth oil section. The first oil section is used to connect the rod cavity and the bidirectional pump 7, the second oil section is used to connect the rodless cavity and the bidirectional pump 7, the first one-way valve, the first accumulator 5 and the third switch valve 11 are arranged on the first oil section, the second one-way valve, the second accumulator 6 and the fourth switch valve 12 are arranged on the second oil section; the first switch valve 9 is arranged on the third oil section, the second switch valve 10 is arranged on the fourth oil section, and the fifth switch valve 13 is arranged on the fifth oil section.

[0035] Specifically, the third oil section is connected at both ends to the first oil section, and one end is connected between the bidirectional pump 7 and the third switch valve 11, and the other end is connected between the rod cavity and the first one-way damping valve 3; the fourth oil section is connected at both ends to the first oil section, and one end is connected between the bidirectional pump 7 and the fourth switch valve 12, and the other end is connected between the rodless cavity and the second one-way valve; one end of the fifth oil section is connected to the first oil section and arranged between the first accumulator 5 and the third switch valve 11, and the other end is connected to the second oil section and arranged between the second accumulator 6 and the fourth switch valve 12.

[0036] The first one-way damping valve 3 comprises a first one-way valve and a first damping valve, and the second one-way damping valve 4 comprises a second one-way valve and a second damping valve. In this embodiment, the first damping valve and the second damping valve are both electrically controlled damping valves; the bidirectional pump 7 is a hydraulic bidirectional pump 7; the bidirectional pump 7 is connected with a motor 8 for driving the bidirectional pump 7. In other embodiments, the first damping valve and the second damping valve are mechanical damping valves or hydraulic damping valves.

[0037] It should be noted that, in the above embodiment, the first switch valve 9, the second switch valve 10, the third switch valve 11 and the fourth switch valve 12 are all electrically controlled switch valves. Figure 2In the diagram, solid arrows indicate the direction of oil flow in compression mode, and dashed arrows indicate the direction of oil flow in tension mode. In this embodiment, when the oil flows from left to right through the one-way damping valve, it flows through the damping valve within the one-way damping valve; when it flows from right to left through the one-way damping valve, it flows through the one-way valve within the one-way damping valve. In this embodiment, the first switching valve 9, the second switching valve 10, the third switching valve 11, the fourth switching valve 12, and the fifth switching valve 13 are all electrically controlled switching valves.

[0038] The working principle of the dual-mode active hydraulic suspension system provided by this utility model is as follows:

[0039] 1. For example Figure 3 As shown, in the first semi-active mode (i.e., the initial state of the active hydraulic suspension system with dual modes), all switching valves are not energized and are in the closed state. When the piston rod 1 moves in a direction within the hydraulic cylinder 2, it can change the volume of the rodless chamber and the rod chamber, thereby changing the volume of the oil contained within them.

[0040] In the stretching mode, the volume of the rod chamber decreases, and the oil stored inside the rod chamber generates an adjustable damping force when it flows through the first one-way damping valve 3. The oil then flows to the first accumulator 5, and the oil stored in the second accumulator 6 flows through the second one-way damping valve 4 into the rodless chamber. During this process, the pressure of the oil entering the first accumulator 5 increases, and the pressure of the liquid flowing out of the second accumulator 6 decreases. The pressure difference generates an elastic force, and the adjustable damping force and elastic force resist the movement of the piston rod 1.

[0041] In compression mode, the volume of the rodless chamber decreases, and the oil stored inside the rodless chamber generates an adjustable damping force when it flows through the second one-way damping valve 4. The oil then flows to the second accumulator 6, and the oil stored in the first accumulator 5 flows through the first one-way damping valve 3 into the rod chamber. During this process, the pressure of the oil entering the second accumulator 6 increases, and the pressure of the liquid flowing out of the first accumulator 5 decreases. The pressure difference generates an elastic force, and the adjustable damping force and elastic force resist the movement of the piston rod 1.

[0042] 2. For example Figure 4 As shown, in the second semi-active mode, the fifth switching valve 13 is energized and opened, while the other switching valves are not energized and remain closed. When the piston rod 1 moves in the hydraulic cylinder 2, it can change the volume of oil contained in the rodless chamber and the rod chamber.

[0043] In the stretching mode, the rod cavity volume decreases, the adjustable damping force is generated when the oil stored in the rod cavity flows through the first one-way damping valve 3, and the oil stored in the first accumulator 5 and the second accumulator 6 (at this time, the first accumulator 5 and the second accumulator 6 can be regarded as an accumulator due to the opening of the fifth switch valve 13) flows out, the two accumulators only play a role in oil supplement, the generated elastic force is very small, and the adjustable damping force is mainly relied on to hinder the movement of the piston rod 1;

[0044] In the compression mode, the rod cavity volume decreases, the adjustable damping force is generated when the oil stored in the rod cavity flows through the second one-way damping valve 4, and then the oil flows into the first accumulator 5 and the second accumulator 6 (at this time, the first accumulator 5 and the second accumulator 6 can be regarded as an accumulator due to the opening of the fifth switch valve 13), the two accumulators only play a role in oil supplement, the generated elastic force is very small, and the adjustable damping force is mainly relied on to hinder the movement of the piston rod 1;

[0045] 3、As shown in Figure 5 In the first active mode, the third switch valve 11 and the fourth switch valve 12 are powered on and opened, and the remaining switch valves are not powered on and remain closed;

[0046] When the bidirectional pump 7 pumps oil into the rod cavity direction, the oil provided by the bidirectional pump 7 flows through the third switch valve 11, the first accumulator 5 and the first one-way damping valve 3 in sequence, and flows into the rod cavity, the oil pressure of the oil flowing into the first accumulator 5 increases, the oil flowing out of the rodless cavity flows through the second one-way damping valve 4, the second accumulator 6 and the fourth switch valve 12 in sequence, and flows into the bidirectional pump 7, the oil pressure of the oil flowing out of the second accumulator 6 decreases, and the active force is generated, so that the piston rod 1 moves in the direction of the rodless cavity;

[0047] When the bidirectional pump 7 pumps oil into the rodless cavity direction, the oil provided by the bidirectional pump 7 flows through the fourth switch valve 12, the second accumulator 6 and the second one-way damping valve 4 in sequence, and flows into the rodless cavity, the oil pressure of the oil flowing into the second accumulator 6 increases, the oil flowing out of the rod cavity flows through the first one-way damping valve 3, the first accumulator 5 and the third switch valve 11 in sequence, and flows into the bidirectional pump 7, the oil pressure of the oil flowing out of the first accumulator 5 decreases, and the active force is generated, so that the piston rod 1 moves in the direction of the rod cavity;

[0048] 4、As shown in ​ In the second active mode, the first switch valve 9, the second switch valve 10 and the fifth switch valve 13 are powered on and opened, and the remaining switch valves are not powered on and remain closed;

[0049] When the bidirectional pump 7 pumps oil to the rod cavity, the oil provided by the bidirectional pump 7 passes through the first switch valve 9, and then is divided into two parts, one part of the oil flows into the rod cavity, and the other part flows through the first one-way damping valve 3 to generate an adjustable active force, and then is divided into two paths, one path flows into the first accumulator 5, and the other path flows through the fifth switch valve 13 into the second accumulator 6, and then flows through the second one-way damping valve 4, and is combined with the oil flowing out of the rodless cavity, and then flows through the second switch valve 10, and finally flows back to the bidirectional pump 7, and the other part of the oil provided by the bidirectional pump 7 flows into the rod cavity, at this time, the two accumulators only play a role of oil supplement, and the generated elastic force is small, and the adjustable active force drives the piston rod 1 to move to the rodless cavity.

[0050] When the bidirectional pump 7 pumps oil to the rodless cavity, the oil provided by the bidirectional pump 7 passes through the second switch valve 10, and then is divided into two parts, one part flows into the rodless cavity, and the other part flows through the second one-way damping valve 4 to generate an adjustable active force, and then is combined with the oil flowing out of the second accumulator 6, and then flows through the fifth switch valve 13, and is combined with the oil flowing out of the first accumulator 5, and then flows through the first one-way damping valve 3, and is combined with the oil flowing out of the rod cavity, and finally flows through the first switch valve 9 into the bidirectional pump 7, at this time, the two accumulators only play a role of oil supplement, and the generated elastic force is small, and the adjustable active force drives the piston rod 1 to move to the rod cavity.

[0051] According to the above description of the present specification, those skilled in the art can also understand that the terms used, such as "upper", "lower", "front", "rear", "left", "right", "width", "horizontal", "top", "bottom", "inner", "outer" and the like indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings of the present specification, and are only for the purpose of facilitating the description of the scheme of the present application and simplifying the description, and do not explicitly or implicitly indicate or imply that the devices or elements involved must have the specific orientation, be constructed and operated in a specific orientation, therefore the above orientation or positional relationship terms cannot be understood or interpreted as a limitation on the scheme of the present application.

[0052] In addition, in the description of the present specification, "a plurality of" means at least two, such as two, three or more, unless otherwise explicitly and specifically limited.

Claims

1. A dual mode active hydraulic suspension system, comprising: The hydraulic cylinder, the piston rod, the first one-way damping valve, the second one-way damping valve, the first accumulator, the second accumulator, the bidirectional pump and the fifth switch valve, the hydraulic cylinder includes a rod cavity containing the piston rod and a rodless cavity not containing the piston rod, the rod cavity, the first one-way damping valve, the bidirectional pump, the second one-way damping valve and the rodless cavity are sequentially connected by an oil path to form a fluid circuit; characterized in that further comprising: a first switch valve, a second switch valve, a third switch valve and a fourth switch valve; The third switch valve is arranged on the oil path and connected with the bidirectional pump and the first accumulator at both ends respectively, and the fourth switch valve is arranged on the oil path and connected with the bidirectional pump and the second accumulator at both ends respectively. The first switch valve is arranged on the oil path, and one end is located between the bidirectional pump and the third switch valve, and the other end is located between the rod cavity and the first one-way damping valve. The second switch valve is arranged on the oil path, and one end is located between the bidirectional pump and the fourth switch valve, and the other end is located between the rodless cavity and the second one-way damping valve. The fifth switch valve is arranged on the oil path, and one end is located between the first accumulator and the third switch valve, and the other end is located between the second accumulator and the fourth switch valve.

2. The dual mode active hydraulic suspension system of claim 1, wherein, The oil path includes a first oil section, a second oil section, a third oil section, a fourth oil section and a fifth oil section, the first oil section is used to connect the rod cavity and the bidirectional pump, the second oil section is used to connect the rodless cavity and the bidirectional pump, the first one-way damping valve, the first accumulator and the third switch valve are arranged on the first oil section, the second one-way damping valve, the second accumulator and the fourth switch valve are arranged on the second oil section, the first switch valve is arranged on the third oil section, the second switch valve is arranged on the fourth oil section, and the fifth switch valve is arranged on the fifth oil section.

3. The dual-mode active hydraulic suspension system of claim 2, wherein, One end of the fifth oil section is connected with the first oil section and arranged between the first accumulator and the third switch valve, and the other end is connected with the second oil section and arranged between the second accumulator and the fourth switch valve.

4. The dual mode active hydraulic suspension system of claim 2, wherein, Both ends of the third oil section are connected with the first oil section, and one end is connected between the bidirectional pump and the third switch valve, and the other end is connected between the rod cavity and the first one-way damping valve; both ends of the fourth oil section are connected with the first oil section, and one end is connected between the bidirectional pump and the fourth switch valve, and the other end is connected between the rodless cavity and the second one-way damping valve.

5. The dual-mode active hydraulic suspension system of any one of claims 1 to 4, wherein, The first one-way damping valve includes a first one-way valve and a first damping valve, and the second one-way damping valve includes a second one-way valve and a second damping valve.

6. The dual-mode active hydraulic suspension system of claim 5, wherein, The first damping valve and the second damping valve are electrically controlled damping valves.

7. The dual-mode active hydraulic suspension system of any one of claims 1 to 4, wherein, The bidirectional pump is a hydraulic bidirectional pump.

8. The dual mode active hydraulic suspension system of any one of claims 1 to 4, wherein, The bidirectional pump is connected with a motor for driving the bidirectional pump.

9. The dual mode active hydraulic suspension system of any one of claims 1 to 4, wherein, The first switch valve, the second switch valve, the third switch valve, the fourth switch valve and the fifth switch valve are electrically controlled switch valves.

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