Active gas-liquid suspension system

Abstract

The utility model relates to an active gas-liquid suspension system which comprises a plurality of gas-liquid suspension systems, a vehicle height sensor, a central control unit and a hydraulic energy storage liquid filling and recycling device. Each gas-liquid suspension system is mounted corresponding to each wheel; the vehicle height sensor is connected with the central control unit; the central control unit is connected with the hydraulic energy storage liquid filling and recycling device so as to control the hydraulic energy storage liquid filling and recycling device. The hydraulic energy storage liquid filling and recycling device is connected with the multiple gas-liquid suspension systems so as to provide hydraulic pressure for the multiple gas-liquid suspension systems. The central control unit judges according to the vehicle height information detected by the vehicle height sensor, the vehicle body posture and command information so as to change the damping of the active gas-liquid suspension system, and the overall size of the system is relatively compact and simple.

Description

Technical Field

[0001] The utility model relates to a vehicle suspension technology of a vehicle, in particular to an active gas-liquid suspension system. Background Art

[0002] There are various types of existing vehicle suspension systems, including leaf spring suspension, coil spring suspension, hydraulic suspension and pneumatic suspension. The elastic coefficient of the leaf spring suspension is relatively constant as the load changes. When the load changes, its natural frequency also changes, so the degree of bumps will vary greatly under different loads. The airbag suspension has dynamic space limitations; it takes a long time to react to changes in road conditions. Both of these existing types of suspension require external active or non-active dampers to attenuate vibrations, and the system is relatively complex and takes up space. Utility Model Content

[0003] The purpose of the utility model is to provide an active gas-liquid suspension system to solve the above-mentioned problems of the prior art.

[0004] The utility model discloses an active gas-liquid suspension system, which comprises: a plurality of gas-liquid suspension systems, a vehicle height sensor, a central control unit and a hydraulic energy storage filling and recovery device; each gas-liquid suspension system is installed corresponding to each wheel; the vehicle height sensor is connected to the central control unit; the central control unit is connected to the hydraulic energy storage filling and recovery device to control the hydraulic energy storage filling and recovery device; the hydraulic energy storage filling and recovery device is connected to a plurality of gas-liquid suspension systems to provide hydraulic pressure to the plurality of gas-liquid suspension systems.

[0005] According to an embodiment of the active air-liquid suspension system of the utility model, the air-liquid suspension system includes: a piston structure and an extended liquid container; an airbag is arranged in the extended liquid container, and the inflation valve of the airbag is installed on the extended liquid container; the airbag can be inflated to form an internal gas space; the extended liquid container has an internal liquid space of the container; the piston structure includes a cylinder, a piston and a piston rod; wherein, the extended liquid container is connected to the cylinder body, the piston is arranged in the cylinder, the piston rod is connected to the piston, the cylinder body connecting shaft is arranged at one end of the cylinder, the piston rod connecting shaft is arranged at the end of the piston rod, the cylinder body connecting shaft and the piston rod connecting shaft are respectively located at two ends of the cylinder, the cylinder body connecting shaft is connected to the wheel axle, and the piston rod connecting shaft is connected to the vehicle body.

[0006] According to an embodiment of the active gas-liquid suspension system of the utility model, the extended liquid container is also connected to a liquid valve, the liquid valve is externally connected to a liquid charging and discharging conduit, and the liquid charging and discharging conduit is connected to the hydraulic energy storage filling and recovery device.

[0007] According to an embodiment of the active gas-liquid suspension system of the utility model, one or more liquid guide grooves are provided in the extended liquid container, and the liquid guide grooves are used to guide the solution at both ends of the inner cavity of the extended liquid container.

[0008] According to an embodiment of the active air-liquid suspension system of the utility model, it also includes: a liquid conduit, and the inner cavity of the cylinder is connected to the expansion liquid container through the liquid conduit.

[0009] According to an embodiment of the active gas-liquid suspension system of the utility model, it also includes: a dust cover, which is sleeved on the bottom of the cylinder and the outer side of the piston rod.

[0010] According to one embodiment of the active air-liquid suspension system of the utility model, it also includes: a damping electronically controlled valve, the cylinder cavity is connected to the extended liquid container through the damping electronically controlled valve, and the damping electronically controlled valve is connected to the central control unit to adjust the damping of the piston structure by controlling the flow of liquid between the piston and the extended liquid container to control the stiffness of the vehicle.

[0011] According to an embodiment of the active air-liquid suspension system of the utility model, it also includes: a charging valve and a discharge valve, and the air-liquid suspension system is connected to the hydraulic energy storage filling and recovery device through the charging valve and the discharge valve; wherein the charging valve is connected to the high-pressure pipe and the high-pressure container in the hydraulic energy storage filling and recovery device; the discharge valve is connected to the low-pressure pipe and the low-pressure container in the hydraulic energy storage filling and recovery device; and pressure airbags are provided in both the high-pressure container and the low-pressure container.

[0012] According to an embodiment of the active air-liquid suspension system of the utility model, each air-liquid suspension system is equipped with a vehicle height sensor, which is a light emitting and receiving device; wherein the light emitting and receiving device is installed in the cylinder cavity facing the piston head, the piston head has a light reflecting surface, the light emitting and receiving device emits and receives the reflected light of the light reflecting surface of the piston head to calculate the vehicle body height; or the light emitting and receiving device is arranged on the piston head, facing the end of the cylinder cavity, the end of the cylinder cavity has a light reflecting surface, the light emitting and receiving device emits and receives the reflected light of the light reflecting surface of the end of the cylinder cavity, and the central control unit is connected to the light emitting and receiving device.

[0013] According to one embodiment of the active air-liquid suspension system of the utility model, the hydraulic energy storage filling and recovery device also includes: a pressure detector and a hydraulic pump; the central control unit is respectively connected to the pressure detector and the hydraulic pump to control the hydraulic pump to pressurize the liquid in the low-pressure pipeline and fill it into the high-pressure container to maintain the pressure in the high-pressure container.

[0014] In summary, the central control unit of the utility model changes the damping of the active gas-liquid suspension system according to the vehicle height information detected by the vehicle height sensor, the vehicle posture and the command information, and achieves the purpose of control. It is suitable for a wide range of applications from small and medium-sized vehicles to large and heavy-duty vehicles. The vehicle equipped with the utility model has a relatively compact and simple overall system volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the active gas-liquid suspension system of the utility model;

[0016] Figure 2 This is a schematic diagram of the vehicle suspension structure of the utility model;

[0017] Figure 3 It is a schematic diagram of an embodiment of the active gas-liquid suspension system of the utility model. DETAILED DESCRIPTION

[0018] In order to make the purpose, content, and advantages of the utility model clearer, the specific implementation methods of the utility model are further described in detail below in conjunction with the drawings and embodiments.

[0019] Figure 1 Figure 1 is a schematic diagram of the active gas-liquid suspension system. Figure 1 As shown, the active gas-liquid suspension system includes: a plurality of gas-liquid suspension systems 1 , a central control unit ECU 31 of the vehicle, and a hydraulic energy storage filling and recovery device 29 .

[0020] Multiple gas-liquid suspension systems 1 are installed corresponding to each wheel of the vehicle. The gas-liquid suspension system 1 is connected to the central control unit ECU31 of the vehicle through a wire 32. ECU31 judges and adjusts the size of the electric control switch 16 according to the detected dynamic information of the vehicle height, the vehicle posture and the command information to change the damping of the suspension system to achieve the purpose of control.

[0021] Figure 2 This is a schematic diagram of a vehicle suspension structure of the utility model, such as Figure 1 As shown, the vehicle suspension structure includes a cylinder 2 , a liquid damping electric control valve 16 , an expansion liquid container 17 and a liquid conduit 15 .

[0022] like Figure 2 As shown, an airbag 18 is arranged in the expansion liquid container 17, and an airbag inflation valve 19 of the airbag 18 is installed on the container 17. The airbag 18 can be inflated to form an internal gas space 27. The expansion liquid container 17 has an internal liquid space 26 of the container.

[0023] like Figure 2As shown, the cylinder 2 is provided with a piston 3, a piston rod 4, a cylinder body connecting shaft 5, a piston rod connecting shaft 6, and a piston guide rail 9. Among them, one end of the piston rod 4 is connected to the piston 3, and the piston rod connecting shaft 6 is arranged at the other end of the piston rod. The piston 3 divides the internal space of the cylinder 2 into a cylinder inner cavity space 7 and a cylinder outer cavity space 8. The cylinder body connecting shaft 5 is arranged at one end of the cylinder 2, and the cylinder body connecting shaft 5 and the piston rod connecting shaft 6 are respectively located at the two ends of the cylinder 2. The piston guide rail 9 is arranged at the bottom of the cylinder 2, and the piston rod 4 is arranged on the piston guide rail 9.

[0024] like Figure 2 As shown, the cylinder cavity 7 is connected to the extended liquid container 17 through the liquid conduit 15 and the damping electric control valve 16. The liquid conduit 15 has an internal space 25 for liquid to pass through. The liquid conduit 15 is connected to the internal liquid space 26 of the extended liquid container 17 through the damping electric control valve 16. The damping electric control valve 16 has a wire 24 of the damping electric control valve to connect external power supply and signal transmission. The damping electric control valve 16 is used to adjust the damping of the piston by controlling the flow of liquid in the piston and the extended liquid container 17, in cooperation with the airbag 18, to control the rigidity of the vehicle.

[0025] like Figure 1 as well as Figure 2 As shown, ECU31 calculates the instantaneous speed and direction of piston head 11 relative to cylinder 2 and the magnitude of acceleration according to the instantaneous position of piston head 11 transmitted by laser ranging sensor wire 32. ECU31 makes decisions based on this information and vehicle posture information, and controls the damping of vehicle suspension system 1 of gas-liquid spring by controlling the opening size of damping electric control valve 16, and controls the filling and discharging amount of liquid through external liquid filling and discharging valve and through liquid conduit 22 to extend liquid container 17, so as to control the height of vehicle body.

[0026] like Figure 2 As shown, for a preferred embodiment, a liquid guide groove 23 is provided in the expansion liquid container 17, and the liquid guide groove 23 is used to guide the solution at both ends of the expansion liquid container 17 to prevent the airbag 18 from blocking the flow of liquid at both ends of the expansion liquid container 17 after the expansion. Specifically, there can be one or more liquid guide grooves 23, so that after the airbag 18 expands, the liquid can still reach the container 17 and flow flexibly.

[0027] like Figure 2 As shown, for a preferred embodiment, a light emitting and receiving device 10 may also be included. The emitting and receiving device 10 is installed in the cylinder cavity 7 facing the piston head 11.

[0028] The light emitting and receiving device 10 can be specifically a laser distance sensor 10, which is arranged at the upper part of the cylinder 2 and connected to external power supply and signal transmission through a laser distance sensor wire 13. The laser distance sensor 10 is directly facing the piston head 11, and measures the distance through a laser beam 12 to detect the instantaneous change of the piston stretching degree.

[0029] like Figure 2 As shown, since the cylinder and the piston are connected to the vehicle body and the axle through the cylinder body connecting shaft 5 and the piston rod connecting shaft 6, respectively, it is equivalent to detecting the instantaneous change of the vehicle body height. Specifically, the cylinder body connecting shaft 5 and the piston rod connecting shaft 6 of the cylinder and the piston can be connected to the axle and the vehicle body respectively through a lever.

[0030] like Figure 2 As shown, the airbag 18 is inside the expansion liquid container 17 and immersed in the liquid 26. The liquid 26 can be a compressible liquid or an incompressible liquid.

[0031] like Figure 2 As shown, the dust cover 14 is sleeved on the bottom of the cylinder 2 and the outer side of the piston rod 4.

[0032] like Figure 2 As shown, the light reflecting surface can also be designed as a partial reflecting surface and a partial absorbing surface so that the divergent light can be partially absorbed. Specifically, the central part of the piston head 11 is the light reflecting surface, and the rest of the piston head 11 is the partial absorbing surface of the light. In the inner cavity 7 of the cylinder 2, the light emitting and receiving device 10 emits a laser, and after being reflected by the piston head 11, the instantaneous position of the piston 3 is determined according to the measured delay. The liquid in the inner cavity 7 of the cylinder has sufficient transparency to ensure that the laser beam 12 of sufficient intensity can be reflected from the piston head 11 back to the light emitting and receiving device 10. Of course, the opposite setting can also be made, that is, the light emitting and receiving device 10 is arranged on the piston head 11, and the relative light reflecting surface is located at the end of the cylinder 2, and similar technical effects can also be obtained.

[0033] like Figure 2 As shown, the internal space 7 of the cylinder is filled with a transparent pressure-resistant medium to ensure that the high pressure inside the cylinder 7 will not cause damage to the light emitting and receiving device 10 .

[0034] like Figure 2 As shown, the cylinder connecting shaft 5 is connected to the wheel shaft, and the piston rod connecting shaft 6 is connected to the vehicle body. Thus, the measurement of the position of the piston 3 will directly obtain the vehicle body height at this angle.

[0035] like Figure 2 As shown, for a preferred embodiment, the light source in the light emitting and receiving device 10 can be any visible and invisible light, or can be a laser.

[0036] like Figure 2 As shown, the distance from the light emitting and receiving device 10 to the light reflecting surface of the piston head 11 can be determined by measuring the time difference between light emission and reception, and then the position of the piston 3 can be obtained.

[0037] like Figure 2 As shown, the distance from the light emitting and receiving device 10 to the light reflecting surface of the piston head 11 can also be determined by measuring the intensity of the received light. Since the light emission intensity is a known quantity, and the light will attenuate with the distance during reflection and propagation. By detecting the reflected light intensity, the position of the piston 3 can be obtained accordingly.

[0038] like Figure 2 As shown, for determining the distance from the light emitting and receiving device 10 to the light reflecting surface of the piston head 11 by measuring the intensity of received light, the attenuation of light can be specifically achieved by the following methods, either alone or in combination: the cylinder cavity space 7 is filled with a medium that can attenuate light. This medium can be a gas or a liquid. As the distance between the light reflecting surface of the piston head 11 and the light emitting and receiving device 10 is different, the attenuation intensity of the reflected light is different. If the distance between the light reflecting surface of the piston head 11 and the light emitting and receiving device 10 is close, the intensity of received light is high, and vice versa, the intensity of received light is low.

[0039] like Figure 2 As shown, the light 12 emitted by the light emitting and receiving device 10 to the light reflecting surface of the piston head 11 is a divergent light with a certain divergent range, and the reflection area of ​​the light reflecting surface of the piston head 11 is fixed. As the distance between the light reflecting surface of the piston head 11 and the light emitting and receiving device 10 is different, the receiving intensity of the light emitting and receiving device 10 is different. When the light reflecting surface of the piston head 11 is close to the light emitting and receiving device 10, the received light intensity is high, and vice versa, the received light intensity is low.

[0040] In fact, the damping electric control valve 16 can be installed at any position between the cylinder 2, the extended liquid container 17 or the liquid conduit 15. The damping electric control valve 16 adjusts the size of the opening to control the amount of liquid passing through, thereby controlling the flow damping of the liquid. Further, the electric control valve 16 can reserve a minimum flow passage in advance to ensure that when the electric control valve 16 is opened to the minimum, the minimum fluid communication can still be maintained. The damping electric control valve 16 can be implemented in a variety of ways, such as using a solenoid valve, a rotary or linear motor, etc.

[0041] like Figure 2 As shown, the extended liquid container 17 is connected to a liquid valve 20 , the liquid valve 20 has a valve switch 21 , and the liquid valve 20 is externally connected to a liquid filling and discharging conduit 22 , through which the liquid in the extended liquid container 17 can be filled and discharged.

[0042] like Figure 2As shown, the gas in the airbag 18 can use air, or can use inert gas nitrogen or argon. These gases are in a pressurized state under normal use.

[0043] like Figure 2 As shown, the liquid conduit 15 can be connected by a hose or a hard pipe. When space permits, the cylinder 2 and the container 17 can be combined into one without the liquid conduit 15.

[0044] Figure 3 FIG. 1 is a schematic diagram of an embodiment of the active gas-liquid suspension system of the utility model. Figure 3 As shown, in the active gas-liquid suspension system 41 of this embodiment, no vehicle height sensor is provided inside the gas-liquid suspension system 1 , and a vehicle height sensor 42 is provided separately and correspondingly outside the gas-liquid suspension system 1 .

[0045] In summary, in the active gas-liquid suspension system of the utility model, the two ends of the cylinder and the piston are respectively connected to the vehicle body and the wheel axle. The ECU judges and adjusts the size of the electronic control switch according to the vehicle height information detected by the vehicle height sensor, the vehicle posture and the command information to change the damping of the suspension system to achieve the purpose of control.

[0046] The vehicle body self-vibration frequency of the utility model can be adjusted and set according to the volume, proportion and size of the liquid and gas; the gas and liquid of the vehicle suspension realize the spring function in a series form; the gas is locked in the expandable and contractible airbag as a part of the gas-liquid spring; the liquid provides the transmission of force from the piston to the gas-liquid spring. The central control unit (ECU) can make timely and accurate judgments based on the vehicle height information and the vehicle body posture information, and control the opening size of the damping electronic control valve to control the instantaneous damping of the system; the energy storage device and the charging and discharging valve provide the system with liquid filling and recovery.

[0047] The utility model is suitable for a wide range of applications from small and medium-sized vehicles to large and heavy-loaded vehicles. The natural frequency of the vehicle equipped with the utility model changes little under a wide range of vehicle loads, and the overall volume of the system is relatively compact.

[0048] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An active gas-liquid suspension system, characterized in that: include: Multiple pneumatic and hydraulic suspension systems, vehicle height sensors, central control units, and hydraulic energy storage filling and recovery devices; Each gas-liquid suspension system is installed corresponding to each wheel; The vehicle height sensor is connected to the central control unit; The central control unit is connected to the hydraulic energy storage filling and recovery device to control the hydraulic energy storage filling and recovery device; The hydraulic energy storage filling and recovery device is connected to a plurality of gas-liquid suspension systems to provide hydraulic pressure to the plurality of gas-liquid suspension systems.

2. The active air-liquid suspension system according to claim 1, characterized in that: The gas-liquid suspension system includes: a piston structure and an expansion liquid container; An air bag is arranged in the expanded liquid container, and an inflation valve of the air bag is installed on the expanded liquid container; the air bag can be inflated to form an internal gas space; the expanded liquid container has an internal liquid space of the container; The piston structure includes a cylinder, a piston and a piston rod; wherein, the extended liquid container is connected to the cylinder body, the piston is arranged in the cylinder, the piston rod is connected to the piston, the cylinder body connecting shaft is arranged at one end of the cylinder, the piston rod connecting shaft is arranged at the end of the piston rod, the cylinder body connecting shaft and the piston rod connecting shaft are respectively located at two ends of the cylinder, the cylinder body connecting shaft is connected to the wheel shaft, and the piston rod connecting shaft is connected to the vehicle body.

3. The active gas-liquid suspension system according to claim 2, characterized in that: The extended liquid container is also connected to a liquid valve, the liquid valve is externally connected to a liquid charging and discharging conduit, and the liquid charging and discharging conduit is connected to a hydraulic energy storage liquid filling and recovery device.

4. The active air-liquid suspension system according to claim 2, characterized in that: One or more liquid guide grooves are arranged in the extended liquid container, and the liquid guide grooves are used to guide the solution at both ends of the inner cavity of the extended liquid container.

5. The active gas-liquid suspension system according to claim 2, characterized in that: Also includes: The liquid conduit is used to connect the inner cavity of the cylinder to the expansion liquid container.

6. The active gas-liquid suspension system according to claim 2, characterized in that: Also includes: The dust cover is sleeved on the bottom of the cylinder and the outer side of the piston rod.

7. The active air-liquid suspension system according to claim 1, characterized in that: Also includes: The damping electronically controlled valve, the inner cavity of the cylinder is connected to the extended liquid container through the damping electronically controlled valve, and the damping electronically controlled valve is connected to the central control unit to adjust the damping of the piston structure by controlling the flow of liquid between the piston and the extended liquid container to control the rigidity of the vehicle.

8. The active gas-liquid suspension system according to claim 2, characterized in that: Also includes: A charging valve and a discharge valve, through which the gas-liquid suspension system is connected to the hydraulic energy storage filling and recovery device; Among them, the filling valve and the high-pressure pipe and high-pressure container in the hydraulic energy storage filling and recovery device are connected; the discharge valve and the low-pressure pipe and low-pressure container in the hydraulic energy storage filling and recovery device are connected; and pressure air bags are provided in both the high-pressure container and the low-pressure container.

9. The active air-liquid suspension system according to claim 2, characterized in that: Each gas-liquid suspension system is equipped with a vehicle height sensor, which is a light emitting and receiving device; Among them, the light emitting and receiving device is installed in the cylinder cavity facing the piston head, the piston head has a light reflecting surface, the light emitting and receiving device emits and receives the reflected light from the light reflecting surface of the piston head to calculate the vehicle body height; or the light emitting and receiving device is set on the piston head, facing the end of the cylinder cavity, the end of the cylinder cavity has a light reflecting surface, the light emitting and receiving device emits and receives the reflected light from the light reflecting surface of the end of the cylinder cavity, and the central control unit is connected to the light emitting and receiving device.

10. The active gas-liquid suspension system according to claim 8, characterized in that: The hydraulic energy storage filling and recovery device also includes: a pressure detection gauge and a hydraulic pump; The central control unit is respectively connected to the pressure detection gauge and the hydraulic pump to control the hydraulic pump to pressurize the liquid in the low-pressure pipeline and inject it into the high-pressure container to maintain the pressure in the high-pressure container.

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