Active oil and gas suspension system

Abstract

The application discloses an active oil-gas suspension system, and relates to the field of vehicle suspension systems.The active oil-gas suspension system comprises the following: a hydraulic cylinder is sealed at both ends; an opening is arranged on the side wall of the hydraulic cylinder; a compression valve and an extension valve are arranged at one end of a piston rod; the compression valve and the extension valve divide the hydraulic cylinder into a rod cavity and a rodless cavity according to the movement direction of the piston rod; the other end of the piston rod extends out of the hydraulic cylinder; an energy accumulator is connected with the rod cavity and the rodless cavity through a one-way throttle valve; oil circulates among the energy accumulator, the rod cavity and the rodless cavity; a motor is connected with a hydraulic pump; the hydraulic pump is connected with the rod cavity and the rodless cavity respectively; the motor drives the hydraulic pump; a controller assembly is connected with the motor, a first one-way throttle valve and a second one-way throttle valve respectively; the controller assembly is used for adjusting the opening degree of the first one-way throttle valve and the second one-way throttle valve and the rotating speed of the motor.The application improves the riding comfort of a vehicle and reduces energy consumption.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of vehicle suspension systems, in particular to an active oil-gas suspension system. BACKGROUND

[0002] Suspension is one of the important assemblies on the automobile, which elastically connects the frame or body with the axle or wheel, transmits torque and mitigates road impact, thereby affecting the handling stability and ride comfort of the vehicle. The oil-gas suspension is a kind of suspension which transmits pressure by oil and uses inert gas as elastic medium, which not only has good buffering capacity and energy storage effect, but also has the function of vehicle height adjustment, which can improve the ride comfort of the vehicle. The oil-gas suspension has a good application prospect on heavy vehicles or off-road vehicles.

[0003] The traditional oil-gas suspension is a passive suspension, and the current controllable oil-gas suspension can be divided into semi-active oil-gas suspension and active oil-gas suspension. The semi-active oil-gas suspension can adjust the damper of itself to make the vehicle better adapt to different road conditions, but the improvement effect is limited. The active oil-gas suspension mainly relies on actuators such as hydraulic pumps and motors to realize active adjustment of the vehicle posture, which can obviously improve the ride comfort of the vehicle, but still has the shortcomings of complex structure, large energy consumption and high cost. For complex road conditions, a new type of active oil-gas suspension system is needed, which can effectively improve the performance of the vehicle and reduce energy consumption.

[0004] For example, a kind of oil-gas suspension system capable of realizing active and semi-active switching control is disclosed in Chinese patent CN201621211965.3. The suspension realizes switching in active mode and semi-active mode through reversing control of the electromagnetic valve. However, the total stroke of the accumulator of the suspension system is too small, the damper cannot be adjusted separately for compression or extension stroke in semi-active mode, the actuation speed is low in active mode, and the two modes cannot be coupled to produce coupling effect. SUMMARY

[0005] The purpose of the present application is to provide an active oil-gas suspension system which can improve the ride comfort of the vehicle and reduce energy consumption.

[0006] To achieve the above purpose, the present application provides the following solutions:

[0007] The present application provides an active oil-gas suspension system, which comprises a piston rod and a hydraulic cylinder, characterized in that the active oil-gas suspension system further comprises a controller assembly, a motor, a hydraulic pump, an extension valve, a compression valve, an accumulator and a one-way throttle valve.

[0008] The hydraulic cylinder is sealed at both ends; and the side wall of the hydraulic cylinder is provided with an opening.

[0009] One end of the piston rod is provided with the compression valve and the extension valve; the compression valve and the extension valve divide the hydraulic cylinder into a rod cavity and a rodless cavity according to the movement direction of the piston rod; the other end of the piston rod extends out of the hydraulic cylinder;

[0010] The accumulator communicates with the rod cavity and the rodless cavity through the one-way throttle valve; the oil circulates between the accumulator, the rod cavity and the rodless cavity;

[0011] The motor is connected with the hydraulic pump; the hydraulic pump communicates with the rod cavity and the rodless cavity respectively;

[0012] The motor drives the hydraulic pump; the controller assembly is connected with the motor and the one-way throttle valve respectively; the controller assembly is used for adjusting the opening of the one-way throttle valve and the rotating speed of the motor.

[0013] Optionally, a first opening and a second opening are arranged on the side wall of the rod cavity; a third opening and a fourth opening are arranged on the side wall of the rodless cavity; the one-way throttle valve comprises a first one-way throttle valve and a second one-way throttle valve; the accumulator communicates with the first opening through the first one-way throttle valve; the accumulator communicates with the third opening through the second one-way throttle valve; the hydraulic pump communicates with the second opening and the fourth opening respectively.

[0014] Optionally, the active oil-gas suspension system further comprises a supplementary accumulator, a relief valve and a check valve;

[0015] The supplementary accumulator communicates with the hydraulic pump through the check valve and the relief valve.

[0016] Optionally, the relief valve comprises a first relief valve and a second relief valve; the check valve comprises a first check valve and a second check valve;

[0017] The supplementary accumulator communicates with the fourth opening through the first check valve;

[0018] The supplementary accumulator communicates with the fourth opening through the first relief valve;

[0019] The supplementary accumulator communicates with the second opening through the second check valve;

[0020] The supplementary accumulator communicates with the second opening through the second relief valve.

[0021] Optionally, the accumulator is a diaphragm accumulator.

[0022] Optionally, the hydraulic pump is an axial piston fixed displacement pump.

[0023] Optionally, the one-way throttle valve is an electrically controlled throttle valve; the one-way throttle valve adjusts the throttle opening by changing the input current.

[0024] Optionally, the compression valve and the extension valve are both one-way valves; the oil flows between the rodless chamber and the rod chamber through the compression valve and the extension valve.

[0025] According to the specific embodiments provided in the present application, the present application discloses the following technical effects:

[0026] The present application provides an active oil-gas suspension system, when the controller assembly is not working, the working mode of the active oil-gas suspension system is passive mode; when the controller assembly only controls the one-way throttle valve, the working mode of the active oil-gas suspension system is semi-active mode; when the controller assembly only controls the motor, the working mode of the active oil-gas suspension system is full-active mode; when the controller assembly controls both the one-way throttle valve and the motor, the working mode of the active oil-gas suspension system is cooperative mode. The semi-active mode of the active oil-gas suspension has continuous damping adjustment function and superior performance. The oil-gas suspension system of the present application can adjust the damping force size of the compression stroke and the extension stroke respectively by adjusting the opening of the two electrically controlled one-way throttle valves in the semi-active mode, realizes stepless adjustment, has simple control, light structure and low energy consumption. The full-active mode of the oil-gas suspension has fast actuation speed and high efficiency. The oil-gas suspension system of the present application can control the motor to quickly adjust the speed of the hydraulic pump in the active mode, directly applies the oil pressure on the piston rod, and realizes the active actuation force effect. The cooperative mode of the oil-gas suspension integrates the advantages of the semi-active mode and the full-active mode. The oil-gas suspension system of the present application can adjust the opening of the electrically controlled one-way throttle valve to cooperate with the actuation effect of the active mode in the cooperative mode, provides the active actuation force of the active mode when the ideal damping force provided by the semi-active mode is insufficient, reduces energy consumption, and ensures the improvement effect of the vehicle smoothness. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0028] Figure 1 is a structure schematic diagram of the active oil-gas suspension system of the present application.

[0029] Figure 2 is an extension stroke oil flow direction diagram of the present application.

[0030] Figure 3 is a compression stroke oil flow direction diagram of the present application.

[0031] Figure 4 This is the suspension elastic force-displacement characteristic of this application.

[0032] Figure 5 This is the suspension damping force-speed characteristic of this application.

[0033] Symbol explanation: 1. Piston rod; 2. Hydraulic cylinder; 3. Accumulator; 4. Compression valve; 5. Extension valve; 6. First one-way throttle valve; 7. Second one-way throttle valve; 8. Hydraulic pump; 9. Motor; 10. Supplementary accumulator; 11. First relief valve; 12. Second relief valve; 13. First check valve; 14. Second check valve. Detailed Implementation

[0034] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0035] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] like Figures 1 to 5 As shown, this application provides an active hydropneumatic suspension system, including a piston rod 1 and a hydraulic cylinder 2. The active hydropneumatic suspension system further includes: a controller assembly, a motor 9, a hydraulic pump 8, a tension valve 5, a compression valve 4, an accumulator 3, and a one-way throttle valve.

[0037] The hydraulic cylinder 2 is sealed at both ends; the side wall of the hydraulic cylinder 2 is provided with an opening.

[0038] One end of the piston rod 1 is provided with the compression valve 4 and the extension valve 5; the compression valve 4 and the extension valve 5 divide the hydraulic cylinder 2 into a rod chamber and a rodless chamber according to the movement direction of the piston rod 1; the other end of the piston rod 1 extends out of the hydraulic cylinder 2.

[0039] The accumulator 3 is connected to the rodless chamber and the rod chamber through the one-way throttle valve; the oil circulates between the accumulator 3, the rodless chamber and the rod chamber.

[0040] The motor 9 is connected to the hydraulic pump 8; the hydraulic pump 8 is connected to the rod chamber and the rodless chamber respectively.

[0041] The motor 9 drives the hydraulic pump 8; the controller assembly is connected with the motor 9 and the one-way throttle valve respectively; the controller assembly is used for adjusting the opening of the one-way throttle valve and the rotating speed of the motor 9.

[0042] Specifically, the side wall of the rod cavity is provided with a first opening and a second opening; the side wall of the rodless cavity is provided with a third opening and a fourth opening; the one-way throttle valve includes a first one-way throttle valve 6 and a second one-way throttle valve 7; the accumulator 3 is communicated with the first opening through the first one-way throttle valve 6; the accumulator 3 is communicated with the third opening through the second one-way throttle valve 7; the hydraulic pump 8 is communicated with the second opening and the fourth opening respectively.

[0043] As a specific embodiment, the active oil and gas suspension system further includes a supplementary accumulator 10, an overflow valve and a check valve. The supplementary accumulator 10 is connected in communication through the check valve and the overflow valve on both sides of the hydraulic pump 8.

[0044] Further, the overflow valve includes a first overflow valve 11 and a second overflow valve 12; the check valve includes a first check valve 13 and a second check valve 14.

[0045] The supplementary accumulator 10 is communicated with the fourth opening through the first check valve 13. The supplementary accumulator 10 is communicated with the fourth opening through the first overflow valve 11. The supplementary accumulator 10 is communicated with the second opening through the second check valve 14. The supplementary accumulator 10 is communicated with the second opening through the second overflow valve 12.

[0046] As a specific embodiment, the accumulator 3 is a diaphragm accumulator, including a liquid part and a gas part, the gas part is sealed by a diaphragm, and the liquid part is communicated with the oil in the hydraulic cylinder 2.

[0047] The hydraulic pump 8 is an axial piston fixed displacement pump. The rotating speed is controlled by the motor 9 to realize bidirectional pumping.

[0048] The one-way throttle valve is an electric control type throttle valve. The one-way throttle valve adjusts the opening of the throttle valve by changing the input current.

[0049] The compression valve 4 and the extension valve 5 are both one-way valves; the oil flows between the rodless cavity and the rod cavity through the compression valve 4 and the extension valve 5. Specifically, the compression valve 4 and the extension valve 5 are both one-way valves with a certain opening pressure.

[0050] In practical application, a ring-shaped sealing plug is connected to the end of the piston rod 1, and the outer peripheral wall of the ring-shaped sealing plug is in contact with the inner wall surface of the hydraulic cylinder 2. A ring-shaped sealing plug is fixedly connected to the inner periphery of the bottom of the hydraulic cylinder 2, and the inner wall surface of the ring-shaped sealing plug is in contact with the outer wall surface of the piston rod 1.

[0051] As shown in Figure 2 , in the extension stroke, part of the oil in the rod cavity flows into the rodless cavity through the extension valve 5, and the other part flows into the rodless cavity through the throttle valve of the first one-way throttle valve 6 and the one-way valve of the second one-way throttle valve 7. Due to the volume of the piston rod 1, the oil in the accumulator 3 flows into the hydraulic cylinder 2 through the one-way valve of the second one-way throttle valve 7.

[0052] As shown in Figure 3 , in the compression stroke, part of the oil in the rodless cavity flows into the rod cavity through the compression valve 4, and the other part flows into the rod cavity through the throttle valve of the second one-way throttle valve 7 and the one-way valve of the first one-way throttle valve 6. Due to the volume of the piston rod 1, part of the oil in the rodless cavity of the hydraulic cylinder 2 flows into the accumulator 3 through the throttle valve of the second one-way throttle valve 7.

[0053] The control and adjustment part of the semi-active mode mainly consists of a controller assembly, a first one-way throttle valve 6 and a second one-way throttle valve 7. The controller assembly adjusts the opening of the first one-way throttle valve 6 to adjust the damping force of the suspension in the extension stroke, and adjusts the opening of the second one-way throttle valve 7 to adjust the damping force of the suspension in the compression stroke. According to the body posture signal and the road preview information, the expected damping force can be calculated, and then the controller assembly is used to generate infinitely adjustable damping force in the corresponding stroke, realizing the effect of semi-active mode.

[0054] The control and adjustment part of the full-active mode mainly consists of a hydraulic pump 8, a motor 9, a supplementary accumulator 10, a first overflow valve 11, a second overflow valve 12, a first check valve 13 and a second check valve 14. According to the body posture signal and the road preview information, the expected damping force can be calculated, and then the controller assembly is used to control the speed of the motor 9 to adjust the flow of the hydraulic pump 8, and the oil directly pushes the piston rod 1 to generate the required actuating force.

[0055] The control and adjustment part of the cooperative mode includes the adjustment parts of the semi-active and full-active modes. The cooperative mode preferentially adopts the control strategy of the semi-active mode. When the damping force provided by the semi-active mode cannot meet the demand of the expected damping force, the active mode control part intervenes, and the hydraulic pump 8 starts to work to supplement the difference between the expected damping force and the actual damping force. At this time, the one-way throttle valve should also be adjusted to the appropriate opening degree to generate sufficient expected damping force and improve the actuating efficiency. Specifically, Figure 5 , the semi-active mode is also the control range of the semi-active mode.Figure 5 For example, the suspension speed at this time is taken as the horizontal coordinate, and the expected damping force is taken as the vertical coordinate to be substituted into the coordinate system, to determine whether the point is in the shadow interval (i.e., the semi-active mode control range) to determine whether the damping force generated by the semi-active mode can reach the expected damping force.

[0056] The application has the following characteristics:

[0057] 1. The elastic element of the active oil-gas suspension system designed in the application is an oil-gas spring, which can generate a nonlinear elastic force, and the elastic coefficient becomes larger when the compression amount is larger, which meets the commonly used use environment of the automobile. The elastic force-displacement curve is as shown in Figure 4 .

[0058] 2. The damping system of the active oil-gas suspension system designed in the application can control the electric control type one-way throttle valve to infinitely adjust the damping force of the compression and extension stroke through input current, and the damping characteristic is stable, and the adjustable range is large. The damping force-speed curve is as shown in Figure 5 .

[0059] 3. The active oil-gas suspension system designed in the application has a large active actuator range, and the active actuator can reach about 3000N, which can meet most of the current vehicle driving scenes and can match the development of the active oil-gas suspension.

[0060] The application discloses an active oil-gas suspension system, which realizes semi-active mode, full-active mode and collaborative mode of the oil-gas suspension through adjusting the opening of the one-way throttle valve and the motor speed by using a controller assembly. The application combines the advantages of semi-active suspension and active suspension, improves the vehicle driving smoothness, reduces energy consumption, and has fast response speed.

[0061] The technical features of the above embodiments can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above embodiments are not described, but as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present application.

[0062] The principles and implementation modes of the application are described by using specific examples in this paper, and the above embodiment description is only used to help understand the method and its core idea of the application; meanwhile, for those skilled in the art, according to the idea of the application, the specific implementation mode and application range will be changed. In view of the above, the content of the specification should not be understood as a limitation of the application.

Claims

1. An active oil and gas suspension system comprising a piston rod and a hydraulic cylinder, characterized in that, The active oil-gas suspension system further comprises a controller assembly, a motor, a hydraulic pump, a stretching valve, a compression valve, an accumulator and a one-way throttle valve; Two ends of the hydraulic cylinder are sealed; the side wall of the hydraulic cylinder is provided with an opening; One end of the piston rod is provided with the compression valve and the stretching valve; the compression valve and the stretching valve divide the hydraulic cylinder into a rod cavity and a rodless cavity according to the movement direction of the piston rod; the other end of the piston rod extends out of the hydraulic cylinder; The accumulator communicates with the rod cavity and the rodless cavity through the one-way throttle valve; the oil circulates between the accumulator, the rod cavity and the rodless cavity; The motor is connected with the hydraulic pump; the hydraulic pump respectively communicates with the rod cavity and the rodless cavity; The motor drives the hydraulic pump; the controller assembly is connected with the motor and the one-way throttle valve respectively; the controller assembly is used for adjusting the opening degree of the one-way throttle valve and the rotating speed of the motor; The side wall of the rod cavity is provided with a first opening and a second opening; the side wall of the rodless cavity is provided with a third opening and a fourth opening; the one-way throttle valve comprises a first one-way throttle valve and a second one-way throttle valve; the accumulator communicates with the first opening through the first one-way throttle valve; the accumulator communicates with the third opening through the second one-way throttle valve; the hydraulic pump respectively communicates with the second opening and the fourth opening; The active oil-gas suspension system further comprises a supplementary accumulator, an overflow valve and a check valve; The supplementary accumulator communicates with the hydraulic pump through the check valve and the hydraulic pump; The supplementary accumulator communicates with the hydraulic pump through the overflow valve and the hydraulic pump; The overflow valve comprises a first overflow valve and a second overflow valve; the check valve comprises a first check valve and a second check valve; The supplementary accumulator communicates with the fourth opening through the first check valve; The supplementary accumulator communicates with the fourth opening through the first overflow valve; The supplementary accumulator communicates with the second opening through the second check valve; The supplementary accumulator communicates with the second opening through the second overflow valve.

2. The active oil and gas suspension system of claim 1, wherein, The accumulator is a diaphragm accumulator.

3. The active oil and gas suspension system of claim 1, wherein, The hydraulic pump is an axial plunger constant-displacement pump.

4. The active oil and gas suspension system of claim 1, wherein, The one-way throttle valve is an electric control type throttle valve; the one-way throttle valve adjusts the opening degree of the throttle valve by changing the input current.

5. The active oil and gas suspension system of claim 1, wherein, The compression valve and the stretching valve are both one-way valves; the oil flows between the rod cavity and the rodless cavity through the compression valve and the stretching valve.

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