Energy saving device for suspension experiments

Abstract

The present application relates to the technical fields of automobile manufacturing detection, and especially relates to an energy-saving device for suspension experiment, which comprises a rack, a loading unit connected to the top of the rack, an actuator included in the loading unit, a loading beam connected to the top of the piston rod of the actuator, a clamp connected to the bottom of the piston rod, the top of an air spring assembly connected to the loading beam, the bottom of the air spring assembly connected to the rack, the downward pressure of the actuator conducted to the air spring assembly through the loading beam, and the air spring assembly generating upward gas pressure and elastic deformation force under the pressure of the loading beam to reduce the load required to be borne by the actuator. The present application provides an energy-saving device for suspension experiment, which can effectively balance the downward pulling force of the loading unit, significantly reduce the operating energy consumption, and realize a substantial improvement in energy-saving effect. The device has simple structure and wide application range, and can be widely applied to suspension performance testing of various vehicles.

Description

Technical Field

[0001] This invention relates to the field of automotive manufacturing testing technology, and in particular to an energy-saving device for suspension testing. Background Technology

[0002] With the increasing popularity of passenger cars, people's requirements for vehicle safety and comfort are rising, and related performance relies on a large amount of test data. As a key assembly, the suspension system requires its components to undergo durability and fatigue life tests before installation on vehicles, often involving dynamic loading under simulated real-vehicle conditions. Currently, such tests mainly use hydraulic servo loading devices, which apply alternating loads through actuators controlled by servo valves. However, traditional devices suffer from significant energy consumption problems: large throttling losses in servo valves, unrecovered energy from the reciprocating motion of actuators, and continuous high-load operation of hydraulic pumps lead to high electrical energy consumption, especially during long-term durability tests, where energy consumption has become a significant burden for testing units. Furthermore, with increasing demands for energy conservation and emission reduction, existing testing equipment is insufficient in terms of energy efficiency and environmental protection. Therefore, there is an urgent need to develop an energy-saving device for suspension testing to effectively reduce operating energy consumption, improve energy utilization efficiency, and meet the needs of efficient testing and green development of automotive components. Summary of the Invention

[0003] In view of the aforementioned shortcomings of current suspension testing devices, this invention provides an energy-saving device for suspension testing. This device effectively balances the downward force of the loading unit, significantly reduces the energy consumption during suspension testing, and achieves a substantial improvement in energy efficiency. The device has a simple structure, wide applicability, and can be widely used for suspension performance testing of various vehicles.

[0004] To achieve the above objectives, the embodiments of the present invention adopt the following technical solutions:

[0005] An energy-saving device for suspension testing includes a frame with a loading unit connected to its top. The loading unit includes an actuator, a loading beam connected to the top of the actuator's piston rod, and a clamp connected to the bottom of the piston rod. The loading beam is connected to the top of an air spring assembly, and the bottom of the air spring assembly is connected to the frame. The downward pressure of the actuator is transmitted to the air spring assembly through the loading beam. Under the pressure of the loading beam, the air spring assembly generates upward gas pressure and elastic deformation force to reduce the load that the actuator needs to bear.

[0006] According to one aspect of the invention, a tension / compression load sensor is also included, which is disposed at the lower end of the air spring assembly for monitoring the dynamic load borne by the air spring assembly.

[0007] According to one aspect of the invention, the air spring assembly includes at least one air spring, which is connected in series via an air spring connecting flange, with the top air spring connected to the loading beam and the bottom air spring connected to the tension / compression load sensor.

[0008] According to one aspect of the present invention, a mounting base assembly is provided on the frame, the mounting base assembly including a bottom mounting plate, an upper fixing plate, and a sensor mounting plate, the bottom mounting plate being fixedly mounted on the frame, the upper fixing plate being connected to the bottom mounting plate via a support column, the sensor mounting plate being connected to the bottom mounting plate via a small support column, and the tension / compression load sensor being mounted on the sensor mounting plate.

[0009] According to one aspect of the invention, a guiding device is also included, the guiding device comprising a guide beam and a guide rod, the guide beam being connected to the air spring assembly, the guide beam being sleeved on the guide rod and being slidable up and down along the guide rod.

[0010] According to one aspect of the invention, two air spring assemblies are provided, and the two air spring assemblies are symmetrically arranged on both sides of the loading unit.

[0011] According to one aspect of the invention, the air spring assembly is connected to a pneumatic system configured to supply gas to the air spring assembly and regulate the internal air pressure of the air spring assembly.

[0012] According to one aspect of the invention, a control system is also included, which is connected to the loading unit, the tension / compression load sensor, and the pneumatic system, respectively.

[0013] According to one aspect of the present invention, the pneumatic system includes an air source processing system, a proportional pressure reducing valve, and an air storage tank, wherein the input end of the proportional pressure reducing valve is connected to the air source processing system, the output end of the proportional pressure reducing valve is connected to the air storage tank, and the air storage tank is connected to the air spring assembly.

[0014] According to one aspect of the invention, the loading unit further includes a displacement sensor and a load sensor, one end of the actuator is connected to the displacement sensor and the other end is connected to the load sensor, the displacement sensor is mounted on the top of the frame, and the load sensor is connected to the fixture.

[0015] The advantages of this invention are as follows: By incorporating an energy-saving device, an upward force can be applied to the loading beam and transmitted to the upper end of the actuator's piston rod. This force balances the downward force of the piston rod, thereby achieving a balance between the initial static and dynamic forces (vehicle weight). By incorporating air springs, gas can be introduced into the air springs, generating gas pressure and elastic deformation force. Furthermore, by changing the gas pressure within the air springs, the requirements of different test forces of varying magnitudes can be met, thus improving the applicability of the equipment. The static load changes of the air springs are relatively stable, while they can respond quickly to dynamic loads, enabling rapid energy storage and release. Connecting two air springs in series reduces the deformation of a single air spring during the experiment, resulting in a smaller load variation range and extending the service life of the air springs. Incorporating two energy-saving devices on both sides of the loading unit balances the force on the piston rod, preventing the piston rod from being affected by bending moment forces, thereby improving the actuator's service life. By configuring the pneumatic and control systems, the internal air pressure of the air springs can be adjusted to meet the requirements of different test forces of varying magnitudes. The control system is responsible for the precise coordination and closed-loop management of the entire testing process. It collects force and displacement sensor signals in real time, adjusts the output of the servo valve, and controls the actuator to dynamically load according to a set load spectrum, thereby achieving precise control of test parameters, data monitoring, and automated operation. This invention provides an energy-saving device for suspension testing that effectively balances the downward pull of the actuator. Through a clever force transmission mechanism, the load is evenly distributed, significantly reducing the energy consumption of the suspension testing device and achieving a substantial improvement in energy efficiency. This device has a simple structure, wide applicability, and can be widely used in suspension performance testing of various vehicles, showing promising application prospects and significant economic and social benefits. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a three-dimensional structural schematic diagram of an energy-saving device for suspension testing according to the present invention;

[0018] Figure 2 This is a three-dimensional structural diagram of a suspension test device using the energy-saving device described in this invention;

[0019] Figure 3 This is a cross-sectional schematic diagram of an energy-saving device for suspension testing according to the present invention;

[0020] Figure 4This is a diagram showing the test force composition of an actuator according to the present invention;

[0021] Figure 5 This is a schematic diagram of the air spring structure of an energy-saving device for suspension testing according to the present invention;

[0022] Figure 6 The dynamic characteristics of the air spring described in this invention;

[0023] Figure 7 The static characteristics of the air spring described in this invention;

[0024] Figure 8 These are the mechanical properties of a helical spring;

[0025] Figure 9 This is a schematic diagram of a pneumatic system.

[0026] Numbering on the map:

[0027] 1. Frame; 11. Column; 12. Crossbeam; 13. Upper mounting plate; 14. Guardrail; 15. Base; 2. Loading unit; 21. Actuator; 25. Load sensor; 28. Loading device; 30. Displacement sensor; 3. Reaction frame; 4. Clamp; 5. Energy-saving device; 51. Mounting assembly; 511. Bottom mounting plate; 512. Support column; 513. Upper fixing plate; 514. Small support column; 515. Sensor mounting. 53. Air spring assembly; 531. Lower air spring plate; 532. First air spring; 533. Air spring connecting flange; 534. Second air spring; 54. Tension and compression load sensor; 55. Guide device; 551. Guide rod; 552. Guide beam; 553. Bearing sleeve; 554. Bearing baffle; 555. Upper plate flange; 6. Loading beam; 01. Air source treatment system; 02. Proportional pressure reducing valve; 03. Air storage tank; 04. Pressure gauge. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Example 1

[0030] like Figures 1 to 9As shown, an energy-saving device for suspension testing is used in an automotive suspension testing device. This suspension device includes a frame 1, a loading unit 2, a reaction frame 3, a loading beam 6, a clamp, and an energy-saving device 5. The frame 1 is used to mount various components on the chassis. The frame includes a base 15, columns 11, a crossbeam 12, an upper mounting plate 13, and a guardrail 14. Two columns 11 are symmetrically fixed at both ends of the base 15. The crossbeam is fixed between the two columns 11 or at their top. The guardrail 14 is fixedly mounted on the crossbeam 12, and the upper mounting plate 13 is located on the top of the guardrail 14. The reaction frame 3 is mounted on the base 15 of the frame 1 and is positioned between the two columns 11. The top of the frame 1 is connected to a loading unit 2, which is located between two columns 11. Specifically, the top of the loading unit 2 is connected to the upper mounting plate 13 of the frame 1, and the bottom of the loading unit 2 is connected to a clamp 4, which is mounted on the reaction frame 3. The energy-saving device includes an air spring assembly 53, which is located on the frame. Specifically, the air spring assembly 53 is mounted on the crossbeam 12 of the frame 1, and a loading beam 6 is located at the top of the air spring assembly 53. The loading beam 6 is mounted on the upper end of the loading unit 2. When the loading unit 2 applies a loading force, it will transfer the force to the loading beam 6. After the test piece (suspension) is mounted on the clamp 4, the loading unit 2 drives one end of the clamp 4 to rise and fall relative to the reaction frame 3 to perform vertical loading on the test piece (suspension). The energy-saving device 5 generates an upward force under the pressure of the loading beam 6 and acts on the loading unit 2 to reduce the load that the loading unit 2 needs to bear.

[0031] In this embodiment, the loading unit includes an actuator 21, a displacement sensor 30, and a load sensor 25. One end of the actuator 21 is connected to the displacement sensor 30, and the other end is connected to the load sensor 25. The displacement sensor 30 is mounted on the top of the frame 1, specifically on the upper mounting plate 13 of the frame 1. The lower end of the displacement sensor 30 is connected to the telescopic rod of the actuator 21. The load sensor 25 is connected to the clamp 4 via a loading device 28.

[0032] In this embodiment, the loading beam 6 is installed at the top of the piston rod of the actuator 21. Under the action of hydraulic oil, the extension or retraction of the piston rod will apply a dynamic load to the loading beam 6.

[0033] In this embodiment, the energy-saving device 5 further includes an energy-saving device mounting base assembly 51. The energy-saving device mounting base assembly 51 includes a bottom mounting plate 511, a support column 512, an upper fixing plate 513, a small support column 514, and a sensor mounting plate 515. The upper fixing plate 513 is fixedly mounted on the bottom mounting plate 511 via the support column 512, and the sensor mounting plate 515 is mounted on the bottom mounting plate 511 via the small support column 514. The air spring assembly 53 is mounted on the energy-saving device mounting base assembly 51. The top of the air spring assembly 53 is connected to the loading beam 6. Under the pressure of the loading beam 6, the air spring assembly 53 generates upward gas pressure and elastic deformation force.

[0034] In this embodiment, two air spring assemblies 53 are provided, symmetrically arranged on both sides of the loading unit 2. This arrangement is to balance the force on the piston rod and avoid the piston rod being affected by bending moment force. In other embodiments, the number of energy-saving devices 5 is not limited, and can be 1, 3, 4, etc., so as to balance the static initial force of the loading unit (vehicle weight).

[0035] In this embodiment, the energy-saving device 5 further includes a tension and compression load sensor 54, which is disposed at the lower end of the air spring assembly 53 to monitor the dynamic load borne by the air spring assembly 53.

[0036] In this embodiment, the air spring assembly 53 includes a first air spring 532 and a second air spring 534. The first air spring 532 and the second air spring 534 are connected by an air spring connecting flange 533. The first air spring 532 is connected to the loading beam 6 via a lower air spring plate 531. The second air spring 534 is connected to the tension / compression load sensor 54 via a lower air spring plate 531. The tension / compression load sensor 54 is mounted on the sensor mounting plate 515. Connecting the two air springs in series reduces the deformation of each air spring during the test, resulting in a smaller load variation range and a longer service life. In other embodiments, the number of air springs is not limited; those skilled in the art can set it as needed, using one or more air springs, i.e., at least one air spring is required. The air springs are connected in series via air spring connecting flanges 533. The top air spring is connected to the loading beam 6 via a lower air spring plate 531, and the bottom air spring is connected to the tension / compression load sensor 54 via a lower air spring plate 531.

[0037] In this embodiment, the energy-saving device 5 further includes a guide device 55, which is configured to guide the movement of the air spring assembly 53 so that it slides smoothly along the guide device 55 and prevents the air spring assembly 53 from deviating or tilting. The guide device 55 includes a guide beam 552 and a guide rod 551. The guide beam 552 is connected to the air spring assembly 53. Specifically, the guide beam 552 is fixedly installed on the air spring connecting flange 533, and the guide beam 552 is sleeved on the guide rod 551 and can slide up and down along the guide rod 551. A bearing sleeve 553 is provided between the guide rod 551 and the guide beam 552. The bearing sleeve 553 is fixedly installed on the guide beam 552 by a bearing baffle 554. The top end of the guide rod 551 is fixedly connected to the upper mounting plate 13 by an upper plate flange 555, and its bottom end is fixedly connected to the upper fixing plate 513. Two guide rods 551 are provided, and the two guide rods 551 are symmetrically arranged on both sides of the air spring assembly. By setting up a guiding device, the air spring assembly can be effectively prevented from shifting or tilting, thereby avoiding the piston rod from bearing bending moment load.

[0038] In this embodiment, a fixing column is fixedly connected between the upper mounting plate 13 and the upper fixing plate 513. The loading beam 6 is sleeved on the fixing column and can slide up and down along the fixing column. In other embodiments, the fixing column can be fixed to the upper mounting plate 13 and the crossbeam 12 or the base 15, mainly used to guide the loading beam and limit its movement, so that the loading amount can slide parallel to the bottom surface.

[0039] Through testing of the energy-saving device used in suspension experiments, it was found that with the addition of energy-saving device 5, the actuator's torque was reduced from 65kN to 35kN, the hydraulic station's capacity was reduced from 400L to 200L, and the power of the energy-saving device used in suspension experiments was reduced from 185kW to 100kW, significantly reducing the test power. According to the test results, the average energy saving reached 34.5%, demonstrating significant economic benefits and making it suitable for widespread application.

[0040] The beneficial effects of this embodiment are as follows: By incorporating an energy-saving device, an upward force can be applied to the loading beam and transmitted to the upper end of the actuator's piston rod. This force balances the downward pull of the piston rod, thereby achieving a balance between the initial static and dynamic forces (vehicle weight). The air springs allow for gas filling, generating gas pressure and elastic deformation force. Furthermore, by changing the gas pressure within the air springs, the requirements of different test forces of varying magnitudes can be met, thus improving the applicability of the equipment. The air springs exhibit relatively stable static load changes and can respond quickly to dynamic loads, enabling rapid energy storage and release. Connecting two air springs in series reduces the deformation of a single air spring during the experiment, resulting in a smaller load variation range and extending the lifespan of the air springs. The presence of two energy-saving devices on both sides of the loading unit balances the forces acting on the piston rod, preventing bending moment forces and further improving the actuator's lifespan. A displacement sensor is installed at the top of the actuator piston rod, and a load sensor is installed at the bottom of the piston rod. The displacement sensor is used to measure the displacement change of the piston rod in real time and accurately, thereby obtaining the dynamic stroke, vibration amplitude, and motion trajectory of the suspension system. This provides key data for analyzing the kinematic characteristics of the suspension, evaluating the response accuracy of the control algorithm, and verifying the simulation model. The load sensor is used to monitor the output force or the reaction force of the actuator in real time, reflecting the stress state and dynamic load characteristics of the suspension under different road conditions. The two sensors work together to comprehensively collect the "displacement-force" dynamic response data of the suspension system, realizing closed-loop monitoring and precise control of the actuator output performance.

[0041] Example 2

[0042] The difference between this embodiment and Embodiment 1 is that, in this embodiment, the air spring assembly 53 is connected to a pneumatic system, which is configured to supply gas to the air spring assembly 53 and regulate the internal air pressure of the air spring assembly 53. Figure 9 As shown, the pneumatic system includes an air source processing system 01, a proportional pressure reducing valve 02, an air tank 03, an air circuit, and a pressure gauge 04. The input end of the proportional pressure reducing valve 02 is connected to the air source processing system 01 via an air circuit, and the output end of the proportional pressure reducing valve 02 is connected to the air tank 03 via an air circuit. The air tank 03 is connected to the air spring assembly 53 via an air circuit, and a pressure gauge 04 is installed between the air tank 03 and the air spring assembly 53. The air source processing system is a three-unit assembly, namely, the air source processing system includes a filter, a pressure reducing valve, and (optionally) an oil mist lubricator.

[0043] In this embodiment, a control system is also included, which is connected to the loading unit 2, the tension / compression load sensor 54, and the pneumatic system. The control system can remotely control and adjust the inflation pressure to meet the force requirements of different experiments. The inflation pressure is measured using a pressure gauge and / or the tension / compression sensor.

[0044] The working principle or operating procedure in this implementation is as follows: Figure 4 As shown, the force output by the actuator has two uses: one is to balance the initial static force F1 on the suspension (simulating the weight of the vehicle body), and the other is to apply the dynamic test force F2 (simulating the bumps under different road conditions), that is: F=F1+F2 (F: total output force of the actuator; F1: initial static force; F2: dynamic test force). The test force F is always a unidirectional force (the loading unit 2 is always under tension). The initial static force F1 remains unchanged during the experiment, that is, the energy-saving device 5 is used to balance the initial static force F1. Then the output force of the actuator is only used to meet the test requirements of the dynamic test force F2. A smaller load actuator can be used to achieve the purpose of energy saving.

[0045] Before the experiment, the air spring assembly 53 is inflated according to the magnitude of F1 in the test force, and the pressure is measured by a pressure gauge and / or a tension / compression sensor. The gas pressure and elastic deformation force of the air spring assembly 53 are applied to the upper end of the piston rod of the actuator through the loading beam 6, forming an upward force. This force is equal to the force (pull force) exerted by the suspension on the lower piston rod of the actuator 21, but in the opposite direction, thus achieving the purpose of balance.

[0046] The two air springs in the energy-saving device are air springs, which rely on the property that the pressure increases as the gas volume decreases to generate elasticity. They serve as elastic elements in the device for loading and storing energy. Specifically, the air springs rely on gas to operate, a characteristic that allows for convenient remote adjustment of the initial static force F1 (by adjusting the air pressure) according to different experimental requirements, making operation more convenient. Figure 6 , Figure 7 and Figure 8 As shown, the pressure characteristics of an air spring are far superior to those of a coil spring. The figure reveals that the mechanical characteristics of a coil spring are relatively simple, while an air spring exhibits different responses to static and dynamic loads. Under static loads, it shows no significant response over a long deformation range, meeting the requirement that the balanced force remains constant during the test. However, its dynamic stiffness increases, enabling it to respond quickly to dynamic loads and rapidly complete the energy storage-release process.

[0047] The beneficial effects of this embodiment are as follows: By configuring the pneumatic and control systems, the pneumatic system can inflate the air springs and regulate the internal air pressure to meet the force requirements of different tests. The control system is responsible for the precise coordination and closed-loop management of the entire test process. It collects force and displacement sensor signals in real time, adjusts the output of the servo valve, and controls the actuators to dynamically load according to the set load spectrum, thereby achieving precise control of test parameters, data monitoring, and automated operation. The pneumatic and control systems together ensure the safety, repeatability, and high precision of the test.

[0048] The advantages of this invention are as follows: By incorporating an energy-saving device, an upward force can be applied to the loading beam and transmitted to the upper end of the actuator's piston rod. This force balances the downward force of the piston rod, thereby achieving a balance between the initial static and dynamic forces (vehicle weight). The air springs allow for gas filling, generating gas pressure and elastic deformation force. Furthermore, by changing the gas pressure within the air springs, the requirements of different test forces of varying magnitudes can be met, thus improving the applicability of the equipment. The air springs exhibit relatively stable static load changes and can respond quickly to dynamic loads, enabling rapid energy storage and release. Connecting two air springs in series reduces the deformation of a single air spring during the experiment, resulting in a smaller load variation range and extending the lifespan of the air springs. The presence of two energy-saving devices on both sides of the loading unit balances the force on the piston rod, preventing bending moment forces and further improving the actuator's lifespan. By configuring the pneumatic and control systems, the internal air pressure of the air springs can be adjusted to meet the force requirements of different tests. The control system is responsible for the precise coordination and closed-loop management of the entire testing process. It collects force and displacement sensor signals in real time, adjusts the output of the servo valve, and controls the actuator to dynamically load according to a set load spectrum, thereby achieving precise control of test parameters, data monitoring, and automated operation. This invention provides an energy-saving device for suspension testing that effectively balances the downward pull of the actuator. Through a clever force transmission mechanism, the load is evenly distributed, significantly reducing the energy consumption of the suspension testing device and achieving a substantial improvement in energy efficiency. This device has a simple structure, wide applicability, and can be widely used in suspension performance testing of various vehicles, showing promising application prospects and significant economic and social benefits.

[0049] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An energy-saving device for suspension testing, comprising a frame (1), wherein a loading unit (2) is connected to the top of the frame (1), the loading unit comprising an actuator (21), characterized in that, The piston rod of the actuator (21) is connected to a loading beam (6) at the top and a clamp (4) at the bottom. The loading beam (6) is connected to the top of the air spring assembly (53) and the bottom of the air spring assembly (53) is connected to the frame (1). The downward pressure of the actuator (21) is transmitted to the air spring assembly (53) through the loading beam (6). Under the pressure of the loading beam (6), the air spring assembly (53) generates upward gas pressure and elastic deformation force to reduce the load that the actuator (21) needs to bear. It also includes a guide device (55), which includes a guide beam (552) and a guide rod (551). The guide beam (552) is connected to the air spring assembly (53). The guide beam (552) is sleeved on the guide rod (551) and can slide up and down along the guide rod (551).

2. The energy-saving device for suspension testing according to claim 1, characterized in that, It also includes a tension / compression load sensor (54), which is located at the lower end of the air spring assembly (53) to monitor the dynamic load borne by the air spring assembly (53).

3. The energy-saving device for suspension testing according to claim 2, characterized in that, The air spring assembly (53) includes at least one air spring, which is connected in series with each other by an air spring connecting flange (533). The top air spring is connected to the loading beam (6), and the bottom air spring is connected to the tension and compression load sensor (54).

4. The energy-saving device for suspension testing according to claim 3, characterized in that, The frame (1) is provided with a mounting base assembly (51), which includes a bottom mounting plate (511), an upper fixing plate (513), and a sensor mounting plate (515). The bottom mounting plate (511) is fixedly mounted on the frame (1). The upper fixing plate (513) is connected to the bottom mounting plate (511) through a support column (512). The sensor mounting plate (515) is connected to the bottom mounting plate (511) through a small support column (514). The tension and compression load sensor (54) is mounted on the sensor mounting plate (515).

5. The energy-saving device for suspension testing according to claim 1, characterized in that, The air spring assembly (53) is configured as two, and the two air spring assemblies (53) are symmetrically arranged on both sides of the loading unit (2).

6. The energy-saving device for suspension testing according to any one of claims 1 to 5, characterized in that, The air spring assembly (53) is connected to a pneumatic system configured to supply gas to the air spring assembly (53) and regulate the internal air pressure of the air spring assembly (53).

7. The energy-saving device for suspension testing according to claim 6, characterized in that, It also includes a control system, which is connected to the loading unit (2), the tension / compression load sensor (54), and the pneumatic system respectively.

8. The energy-saving device for suspension testing according to claim 6, characterized in that, The pneumatic system includes an air source processing system, a proportional pressure reducing valve and an air storage tank. The input end of the proportional pressure reducing valve is connected to the air source processing system, the output end of the proportional pressure reducing valve is connected to the air storage tank, and the air storage tank is connected to the air spring assembly (53).

9. The energy-saving device for suspension testing according to claim 7, characterized in that, The loading unit also includes a displacement sensor (30) and a load sensor (25). One end of the actuator (21) is connected to the displacement sensor (30) and the other end is connected to the load sensor (25). The displacement sensor (30) is mounted on the top of the frame (1) and the load sensor (25) is connected to the clamp (4).

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