Gas-liquid suspension control system
Through the gas-liquid suspension control system, the gas-liquid spring and hydraulic energy storage device are used to combine solenoid valves and optical ranging sensors to adjust the liquid charge and discharge volume in real time, solving the unstable self-vibration frequency and bump degree of existing vehicle suspensions when load changes. The problem of achieving more stable suspension performance and space efficiency.
Patent Information
- Application Number
- CN202421027506.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-13
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-05-13
AI Technical Summary
The existing vehicle suspension system has unstable self-vibration frequency and bumping degree when load changes, and requires an active or non-active damper to attenuate shock. The system is complex and takes up space.
A gas-liquid suspension control system was designed, including multiple gas-liquid springs, central control units, hydraulic energy storage liquid filling and recovery devices. The liquid charging and discharging volume is adjusted in real time through solenoid valves and optical distance measuring sensors to realize the vehicle suspension Dynamic adjustment.
The suspension stability and reaction speed are improved under different load conditions. The system is compact and simple overall, suitable for use from small and medium-sized vehicles to large heavy-duty vehicles.
Smart Images
Figure CN222179138U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a vehicle suspension technology of a vehicle, in particular to a gas-liquid suspension control 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 air bag 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 utility model aims to provide a gas-liquid suspension control system to solve the above-mentioned problems of the prior art.
[0004] The utility model discloses a gas-liquid suspension control system, which comprises: a plurality of gas-liquid springs, a central control unit and a hydraulic energy storage filling and recovery device; each gas-liquid spring is installed corresponding to each wheel; 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 the plurality of gas-liquid springs to provide liquid to the plurality of gas-liquid spring systems; the hydraulic energy storage filling and recovery device comprises: a plurality of solenoid valves, each solenoid valve corresponds to a liquid pipeline connected to the gas-liquid spring; each solenoid valve is respectively connected to an inlet of a low-pressure liquid tank and an outlet of a hydraulic pump, and the inlet of the hydraulic pump is connected to the outlet of the low-pressure liquid tank.
[0005] According to an embodiment of the air-liquid suspension control system of the utility model, the central control unit is connected to the hydraulic energy storage filling and recovery device through a signal line to send instructions to the hydraulic energy storage filling and recovery device to control the switching actions of multiple solenoid valves and hydraulic pumps.
[0006] According to an embodiment of the gas-liquid suspension control system of the utility model, the gas-liquid spring includes: a cylinder, a liquid conduit, a collecting chamber and an extended liquid container; the cylinder is divided into an upper chamber and a lower piston chamber; the upper chamber is a hollow chamber; an optical ranging sensor is installed in the upper chamber; the upper chamber and the lower piston chamber are sealed and connected by a pressure-resistant transparent medium; the lower piston chamber includes a piston rod, a piston head and a piston wall; one end of the piston rod is connected to the piston head, and the other end of the piston rod is connected to the piston rod connecting shaft; the cylinder body connecting shaft is arranged at one end of the cylinder, and the cylinder body connecting shaft and the piston rod connecting shaft are respectively located at two ends of the cylinder; the optical ranging sensor is directly opposite to the piston head of the lower piston chamber; the collecting chamber and the extended liquid container are connected through a valve; the valve is connected to the central control unit; an airbag is arranged in the extended liquid container, and the airbag inflation valve of the airbag is installed on the extended liquid container; the collecting chamber is connected to the hydraulic energy storage filling and recovery device.
[0007] According to an embodiment of the air-liquid suspension control system of the utility model, the lower piston cavity is filled with transparent liquid.
[0008] According to an embodiment of the gas-liquid suspension control system of the utility model, the valve is a CDC valve.
[0009] According to an embodiment of the gas-liquid suspension control 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.
[0010] According to an embodiment of the gas-liquid suspension control 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.
[0011] According to an embodiment of the air-liquid suspension control system of the utility model, the optical ranging sensor is specifically a laser ranging sensor.
[0012] According to an embodiment of the gas-liquid suspension control system of the utility model, it further includes: a liquid conduit, through which the lower piston cavity is connected to the collecting cavity.
[0013] According to an embodiment of the air-liquid suspension control system of the utility model, the cylinder connecting shaft is connected to the wheel shaft, and the piston rod connecting shaft is connected to the vehicle body.
[0014] In summary, the hydraulic energy storage liquid filling and recovery device of the utility model has a simple structure, and the gas-liquid spring and the hydraulic energy storage liquid filling and recovery device are cleverly matched. It is suitable for a wide range of applications from small and medium-sized vehicles to large 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 1This is a schematic diagram of the composition of the gas-liquid suspension control system of the utility model;
[0016] Figure 2 It is the principle diagram of the gas-liquid spring of the utility model. DETAILED DESCRIPTION
[0017] 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.
[0018] Figure 1 The schematic diagram of the air-liquid suspension control system is shown in Figure 2. Figure 1 As shown, the gas-liquid suspension control system includes: a plurality of gas-liquid springs 1 , a central control unit ECU 31 of the vehicle, and a hydraulic energy storage filling and recovery device 26 .
[0019] like Figure 1 As shown, the hydraulic energy storage filling and recovery device 26 includes: a plurality of solenoid valves 29, each solenoid valve 29 corresponds to a liquid pipeline 30 connected to the gas-liquid spring 1. Each solenoid valve 29 is respectively connected to the inlet of the low-pressure liquid tank 27 and the outlet of the hydraulic pump 28. The inlet of the hydraulic pump 28 is connected to the outlet of the low-pressure liquid tank 27.
[0020] like Figure 1 As shown, the central control unit ECU31 of the vehicle is connected to the hydraulic energy storage filling and recovery device 26 via a signal line 32 to send instructions to the hydraulic energy storage filling and recovery device 26 to control the switching actions of multiple solenoid valves 29 and the hydraulic pump 28.
[0021] like Figure 1 As shown, multiple gas-liquid springs 1 are installed corresponding to each wheel of the vehicle. The sensor of the gas-liquid spring 1 is connected to the central control unit ECU31 of the vehicle. ECU31 judges and adjusts the damping of the gas-liquid spring 1 according to the detected dynamic information of the vehicle height, the vehicle posture and the command information, so as to achieve the purpose of controlling the vehicle suspension.
[0022] Figure 2 The schematic diagram of the gas-liquid spring of the utility model is as follows: Figure 1 As shown, the gas-liquid spring 1 includes: a cylinder 2, a liquid conduit 14, a collecting chamber 15 and an expansion liquid container 16.
[0023] like Figure 2As shown, the cylinder 2 is divided into an upper cavity 3 and a lower piston cavity 11. The upper cavity 3 is a hollow cavity, and no liquid is poured into the cavity. An optical distance sensor 8 is installed in the upper cavity 3. The upper cavity 3 and the lower piston cavity 11 are sealed and connected by a pressure-resistant transparent medium 9. The optical distance sensor 8 faces the piston head 5 of the lower piston cavity 11 to emit light to the surface of the piston head 5 and reflect it back to the optical distance sensor 8 to detect the instantaneous change of the piston stretching degree.
[0024] like Figure 2 As shown, the lower piston cavity 11 includes a piston rod 4, a piston head 5 and a piston wall. The lower piston cavity 11 is filled with a transparent liquid when working. One end of the piston rod 4 is connected to the piston head 5, and the other end of the piston rod 4 is connected to the piston rod connecting shaft 7. The cylinder body connecting shaft 6 is arranged at one end of the cylinder 2, and the cylinder body connecting shaft 6 and the piston rod connecting shaft 7 are respectively located at the two ends of the cylinder 2.
[0025] like Figure 2 As shown, the collecting chamber 15 and the extended liquid container 16 are connected through a valve 18, and the outer wall of the collecting chamber 15 is fixedly connected to the outer wall of the extended liquid container 16. The valve 18 can be a CDC valve. The CDC valve 18 is connected to the ECU 31 through a signal line 22. The CDC valve 18 is used to adjust the damping of the piston by controlling the flow of liquid between the piston and the extended liquid container 16, and cooperate with the airbag 17 to control the rigidity of the vehicle.
[0026] like Figure 2 As shown, an airbag 17 is arranged in the expansion liquid container 16, and an airbag inflation valve 20 of the airbag 17 is installed on the expansion liquid container 16. The airbag 17 can be inflated to form an internal gas space 25. The expansion liquid container 16 has an internal liquid space 24.
[0027] like Figure 2 As shown, the lower piston cavity 11 is connected to the collecting cavity 15 through a liquid conduit 14. The collecting cavity 15 has an inner space 23 for storing liquid.
[0028] like Figure 1 as well as Figure 2 As shown, ECU31 receives the instantaneous position of piston head 5 transmitted by optical ranging sensor wire 13 and calculates the instantaneous speed and acceleration information of piston head 5 relative to cylinder 2. ECU31 makes decisions based on this information and vehicle posture information, and controls the damping of gas-liquid spring 1 by controlling the opening size of valve 18, and controls the filling and discharge amount of liquid to the collection chamber 15 of expansion liquid container 16 through solenoid valve 29 and liquid conduit 19 to control the height of the vehicle body.
[0029] like Figure 2As shown, for a preferred embodiment, a liquid guide groove 21 is provided in the expansion liquid container 16, and the liquid guide groove 21 is used to guide the solution at both ends of the expansion liquid container 16 to prevent the airbag 17 from blocking the flow of liquid at both ends of the expansion liquid container 16 after the expansion. Specifically, there can be one or more liquid guide grooves 21, so that after the airbag 17 expands, the liquid can still reach the container 16 and flow flexibly.
[0030] 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 6 and the piston rod connecting shaft 7, it is equivalent to detecting the instantaneous change of the vehicle body height. Specifically, the cylinder body connecting shaft 6 and the piston rod connecting shaft 7 of the cylinder and the piston can be connected to the axle and the vehicle body respectively through a lever.
[0031] like Figure 2 As shown, the airbag 17 is inside the expansion liquid container 16 and immersed in the liquid during operation. The liquid can be a compressible liquid or an incompressible liquid.
[0032] like Figure 2 As shown, the dust cover 12 is sleeved on the bottom of the cylinder 2 and the outer side of the piston rod 4.
[0033] like Figure 2 As shown, the light reflecting surface of the piston head 5 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 5 is the light reflecting surface, and the rest of the piston head 5 is the partial light absorbing surface. In the inner cavity 7 of the cylinder 2, the optical ranging sensor 8 emits light, and after being reflected by the piston head 5, the instantaneous position of the piston 3 is determined according to the measured delay. The liquid in the lower piston cavity 11 has sufficient transparency to ensure that a light beam of sufficient intensity can be reflected from the piston head 5 back to the optical ranging sensor 8.
[0034] like Figure 2 As shown, the cylinder connecting shaft 6 is connected to the wheel shaft, and the piston rod connecting shaft 7 is connected to the vehicle body. Therefore, 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, the distance from the optical distance sensor 8 to the light reflecting surface of the piston head 5 can be determined by measuring the time difference between light emission and reception, and then the position of the piston 3 can be obtained. The distance from the optical distance sensor 8 to the light reflecting surface of the piston head 5 can also be determined by measuring the intensity of light reception. 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.
[0036] like Figure 2As shown, for determining the distance from the optical ranging sensor 8 to the light reflecting surface of the piston head 5 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 lower piston cavity 11 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 5 and the optical ranging sensor 8 varies, the attenuation intensity of the reflected light varies. When the light reflecting surface of the piston head 5 is close to the optical ranging sensor 8, the intensity of received light is high, and vice versa, the intensity of received light is low.
[0037] like Figure 2 As shown, the light emitted by the optical distance sensor 8 to the light reflecting surface of the piston head 5 is a divergent light with a certain divergent range, and the reflection area of the light reflecting surface of the piston head 5 is fixed. As the distance between the light reflecting surface of the piston head 5 and the optical distance sensor 8 varies, the receiving intensity of the optical distance sensor 8 varies. When the distance between the light reflecting surface of the piston head 5 and the optical distance sensor 8 is close, the received light intensity is high, and vice versa, the received light intensity is low.
[0038] like Figure 2 As shown, the optical distance measuring sensor 8 may specifically be a laser distance measuring sensor.
[0039] like Figure 2 As shown, the collecting chamber 15 is connected to a liquid filling and discharging conduit 19 , and the liquid in the collecting chamber 15 can be filled and discharged through the liquid filling and discharging conduit 19 .
[0040] like Figure 2 As shown, the gas in the airbag 17 can be air, or inert gas nitrogen or argon. These gases are in a pressurized state under normal use.
[0041] like Figure 2 As shown, the liquid conduit 14 can be connected using a hose or a hard pipe.
[0042] In summary, in the gas-liquid suspension control system of the utility model, the two ends of the cylinder and the piston are connected to the vehicle body and the wheel axle respectively. The ECU judges and adjusts the size of the electric 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. The hydraulic energy storage filling and recovery device of the utility model has a simple structure, can effectively allocate the liquid of each gas-liquid spring, and occupies a small space.
[0043] 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. A gas-liquid suspension control system, characterized in that: include: Multiple gas-hydraulic springs, a central control unit, and hydraulic energy storage filling and recovery devices; Each gas-liquid spring is installed corresponding to each wheel; 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 the plurality of gas-liquid springs to provide liquid to the plurality of gas-liquid spring systems; The hydraulic energy storage liquid filling and recovery device comprises: a plurality of solenoid valves, each solenoid valve corresponding to a liquid pipeline connected to a gas-liquid spring; Each solenoid valve is respectively connected to the inlet of the low-pressure liquid tank and the outlet of the hydraulic pump, and the inlet of the hydraulic pump is connected to the outlet of the low-pressure liquid tank.
2. The air-liquid suspension control system according to claim 1, characterized in that: The central control unit is connected to the hydraulic energy storage filling and recovery device through a signal line to send instructions to the hydraulic energy storage filling and recovery device to control the switching actions of multiple solenoid valves and hydraulic pumps.
3. The air-liquid suspension control system according to claim 1, characterized in that: The gas-liquid spring comprises: a gas cylinder, a liquid conduit, a collecting chamber and an expansion liquid container; The cylinder is divided into an upper cavity and a lower piston cavity; the upper cavity is a hollow cavity; an optical distance sensor is installed in the upper cavity; the upper cavity and the lower piston cavity are sealed and connected by a pressure-resistant transparent medium; The lower piston cavity includes a piston rod, a piston head and a piston wall; one end of the piston rod is connected to the piston head, and the other end of the piston rod is connected to the piston rod connecting shaft; the cylinder body connecting shaft is arranged at one end of the cylinder, and the cylinder body connecting shaft and the piston rod connecting shaft are respectively located at two ends of the cylinder; the optical ranging sensor is directly facing the piston head of the lower piston cavity; The collecting chamber and the extended liquid container are connected through a valve; the valve is connected to the central control unit; an airbag is arranged in the extended liquid container, and the airbag inflation valve of the airbag is installed on the extended liquid container; the collecting chamber is connected to the hydraulic energy storage filling and recovery device.
4. The air-liquid suspension control system according to claim 3, characterized in that: The lower piston cavity is filled with transparent liquid.
5. The air-liquid suspension control system according to claim 3, characterized in that: The valve is a CDC valve.
6. The air-liquid suspension control system according to claim 3, 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.
7. The air-liquid suspension control system according to claim 3, characterized in that: Also includes: The dust cover is sleeved on the bottom of the cylinder and the outer side of the piston rod.
8. The air-liquid suspension control system according to claim 3, characterized in that: The optical distance measuring sensor is specifically a laser distance measuring sensor.
9. The air-liquid suspension control system according to claim 3, characterized in that: Also includes: The liquid conduit is connected with the collecting chamber through the lower piston cavity.
10. The air-liquid suspension control system according to claim 3, characterized in that: The cylinder connecting shaft is connected to the wheel shaft, and the piston rod connecting shaft is connected to the vehicle body.