Comprehensive test bench for quarter active suspension of new energy automobile

Abstract

The invention discloses a new energy automobile quarter active suspension comprehensive test bench, which relates to the technical field of new energy automobiles and comprises an iron floor, an actuator assembly is arranged at one end of the iron floor, and a sprung mass block guide device is arranged on one side, close to the actuator assembly, of the iron floor. A mass block lifting device is installed at the top end of the sprung mass block guiding device, a measured piece body is arranged at the top end of the actuator assembly, and a first measured piece fixing support connected through a bolt is arranged at the end, close to the measured piece body, of the sprung mass block guiding device. According to the device, the actuator assembly is arranged in the middle of the to-be-tested piece, the to-be-tested piece is locked through the binding band, the wheel fixing device adopts a U-shaped groove design, the to-be-tested piece body can be accurately positioned in the center of the actuator assembly, the wheel can be prevented from deviating, and then the dynamic behavior of a single wheel in real driving can be truly simulated through cooperation of the actuator assembly and the sprung mass block guiding device.

Description

Technical Field

[0001] This invention relates to the field of new energy vehicle technology, specifically a comprehensive test bench for a quarter-load active suspension of new energy vehicles. Background Technology

[0002] The comprehensive test bench for active suspension of new energy vehicles is a full-performance verification platform for active suspension systems of new energy vehicles. Its core function is to simulate the complex working conditions of actual vehicle driving in a laboratory environment, and to conduct comprehensive testing and optimization of the dynamic response, control strategy, reliability, energy consumption characteristics, etc. of active suspension, so as to provide scientific basis for product development, performance calibration and mass production verification.

[0003] However, existing technologies have the following problems: 1) Load simulation distortion: The traditional "fixed beam frame structure" cannot simulate the effect of sprung mass and cannot reflect the dynamic inertial characteristics of the sprung mass of a real vehicle, resulting in a distortion of the evaluation of the suspension control algorithm.

[0004] 2) Insufficient actuator testing capabilities: There is a lack of comprehensive testing methods for the actual working environment (such as mounting point stiffness, lateral force interference) and extreme performance (maximum speed, output, durability) of active actuators.

[0005] 3) Poor integration and reconfigurability: The mechanical structure is fixed, making it difficult to quickly adapt to different vehicle models and different types of suspensions. Replacing test samples takes a long time and affects R&D efficiency.

[0006] 4) When the frequency or amplitude of the simulated road surface excitation is too high, the actuator may cause the main body of the test piece to detach from its upper surface, which may cause a sudden change in the force sensor data and affect the accuracy of the test. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide a comprehensive test bench for a quarter-load active suspension of new energy vehicles.

[0008] To achieve the above objectives, the present invention provides the following technical solution: A comprehensive test bench for a quarter-load active suspension of a new energy vehicle includes a steel floor, an actuator assembly at one end of the steel floor, a sprung mass guide device on the side of the steel floor near the actuator assembly, a mass lifting device installed at the top of the sprung mass guide device, and a test component body at the top of the actuator assembly. The end of the spring mass block guide device near the main body of the test piece is provided with a first test piece fixing bracket connected by bolts, and the end of the spring mass block guide device away from the first test piece fixing bracket is provided with a second test piece fixing bracket, and the second test piece fixing bracket is connected to the spring mass block guide device by bolts. The spring-loaded mass block guide device is provided with a spring-loaded mass block fixing seat at one end near the first test piece fixing bracket and the second test piece fixing bracket. A heavy-duty guide rail is provided at one end of the spring-loaded mass block guide device near the spring-loaded mass block fixing seat. The spring-loaded mass block fixing seat is slidably connected to the heavy-duty guide rail. A detachable mass block body is provided at one end of the spring-loaded mass block fixing seat away from the spring-loaded mass block guide device.

[0009] Preferably, the actuator assembly includes a support base bolted to the top of the iron floor, and a accordion cover is provided at the top of the support base.

[0010] Preferably, the end of the bellows cover away from the support is provided with a wheel fixing device, the wheel fixing device is U-shaped, one end of the wheel fixing device is connected to a strap for stabilizing and limiting the main body of the test piece, and a placement seat is provided between the support and the wheel fixing device.

[0011] Preferably, the mass block lifting device includes a servo motor mounted on the top of the spring-loaded mass block guide device, and the output end of the servo motor is connected to a drive screw.

[0012] Preferably, the drive screw is connected to the output end of the servo motor via a coupling, and a T-shaped screw nut is threaded onto the drive screw. A mass block fixing seat ear plate floats and overlaps above the T-shaped screw nut, and the mass block fixing seat ear plate is fixedly connected to the spring-loaded mass block fixing seat.

[0013] Preferably, the T-shaped lead screw nut and the mass block fixing seat ear plate are in a floating overlapping fit. The mass block fixing seat ear plate is pressed onto the top surface of the T-shaped lead screw nut by its own weight. When the T-shaped lead screw nut descends along the drive screw to disengage from the mass block fixing seat ear plate, mechanical decoupling is achieved.

[0014] Preferably, the spring mass block fixing seat and the spring mass block guiding device are connected by bolts, and the first test piece fixing bracket and the second test piece fixing bracket are respectively threadedly connected to the spring mass block fixing seat with locking bolts.

[0015] Preferably, the heavy-duty guide rail is connected to the spring mass block guide device by bolts, and the heavy-duty guide rail is symmetrically distributed on the surface of the spring mass block guide device.

[0016] Preferably, buffer pads are provided at both ends of the spring-loaded mass guide device, and the mass body is evenly distributed on the spring-loaded mass fixing seat.

[0017] Compared with existing technologies, this comprehensive test bench for a quarter-wave active suspension of new energy vehicles has the following advantages: 1) By replacing the fixed mass block holder of the spring mass block with a sliding guide rail device, the mass block body can be added or removed as needed in actual tests, thereby effectively simulating the changes in the real spring mass and improving the adaptability of the test and the reliability of the data.

[0018] 2) The replacement process of the mass block body is efficiently solved by a specially designed mass block lifting device. This mechanism uses a servo motor drive combined with a drive screw transmission, which can lift the mass block body smoothly and accurately. The mass block body and the mass block lifting device are connected by an overlapping joint, which can achieve mechanical decoupling during the test and ensure that the measurement is not affected by additional mechanical constraints.

[0019] 3) When the frequency or amplitude of the simulated road surface excitation is too high, the actuator assembly may cause the test part to detach from its upper surface, which may cause sudden changes in the force sensor data and affect the accuracy of the test. Therefore, a special strap can be used to fix the test part to the actuator assembly, thereby effectively preventing the test part from detaching and ensuring the stability of the test process and the reliability of the results.

[0020] 4) The actuator component support base of the present invention is provided with a standardized installation interface, which can flexibly switch between linear motor actuators or hydraulic actuators to meet the comprehensive testing requirements of different test scenarios for actuator response speed, output range, durability and other performance indicators. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural schematic diagram of the actuator assembly of the present invention; Figure 3 This is a three-dimensional structural diagram of the mass block body of the present invention; Figure 4 This is a three-dimensional structural diagram of the mass block lifting device of the present invention; Figure 5 This is a three-dimensional structural diagram of the spring-loaded mass block fixing seat of the present invention; Figure 6 This is a three-dimensional structural diagram of the wheel fixing device of the present invention; Figure 7 This is a three-dimensional structural diagram of the test piece after it has been connected according to the present invention; Figure 8This is a three-dimensional cross-sectional view of the actuator assembly of the present invention; Figure 9 This is a schematic diagram showing the connection relationship between the various components of the mass block lifting device of the present invention.

[0022] In the diagram: 1. Metal floor; 2. Actuator assembly; 201. Support base; 202. Bellows cover; 203. Wheel fixing device; 204. Strap; 205. Placement seat; 3. Spring-loaded mass guide device; 4. Mass lifting device; 401. Servo motor; 402. Drive screw; 403. Coupling; 404. Mass fixing seat ear plate; 405. T-type screw nut; 5. Test piece body; 6. First test piece fixing bracket; 7. Second test piece fixing bracket; 8. Spring-loaded mass fixing seat; 9. Locking bolt; 10. Heavy-duty guide rail; 11. Buffer pad; 12. Mass body. Detailed Implementation

[0023] 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.

[0024] like Figures 1-8 As shown, the present invention provides a technical solution: a comprehensive test bench for a quarter-load active suspension of a new energy vehicle, including a steel floor 1, an actuator assembly 2 at one end of the steel floor 1, a sprung mass block guide device 3 on the side of the steel floor 1 near the actuator assembly 2, a mass block lifting device 4 installed at the top of the sprung mass block guide device 3, a test piece body 5 at the top of the actuator assembly 2, a first test piece fixing bracket 6 connected by bolts at the end of the sprung mass block guide device 3 near the test piece body 5, and a second test piece fixing bracket 7 at the end of the sprung mass block guide device 3 away from the first test piece fixing bracket 6, and the second test piece fixing bracket 7 is connected to the sprung mass block guide device 3 by bolts.

[0025] The interior of the iron plate 1 has multiple evenly distributed T-slots. The iron plate 1 provides a high-precision, high-rigidity and highly modular reference platform for workpiece clamping, positioning, measurement and assembly. Bolts can be inserted into the iron plate 1, and it can be used with clamping elements such as pressure plates, blocks, and angle irons to quickly and flexibly fix workpieces of various shapes.

[0026] The actuator assembly 2 includes a support base 201 that is bolted to the top of the iron floor 1, and a bellows cover 202 is provided on the top of the support base 201.

[0027] like Figure 2 and Figure 6 It is known that a wheel fixing device 203 is provided at the end of the accordion cover 202 away from the support base 201. The wheel fixing device 203 is U-shaped and a strap 204 is connected to one end of the wheel fixing device 203 for stabilizing and limiting the main body 5 of the test piece. A placement seat 205 is provided between the support base 201 and the wheel fixing device 203.

[0028] The advantage of setting the wheel fixing device 203 in a U-shape is that after the test part 5 is placed, it can be accurately placed in the center position, which can effectively avoid the phenomenon of deviation. It also allows the test part 5 to achieve the degree of freedom of constraint in the non-test direction, ensuring test stability. At the same time, it can avoid the rigid interference problem of traditional mechanical fixtures, ensuring the accuracy and safety of the quarter active suspension performance test of new energy vehicles.

[0029] like Figure 4 It can be seen that the mass block lifting device 4 includes a servo motor 401 installed at the top of the spring-loaded mass block guide device 3, and the output end of the servo motor 401 is connected to a drive screw 402.

[0030] The drive screw 402 is connected to the output end of the servo motor 401 via a coupling 403, and a mass block fixing seat ear plate 404 is provided on the surface of the drive screw 402.

[0031] A threaded T-shaped screw nut 405 is provided at one end of the drive screw 402 near the ear plate 404 of the mass block fixing seat.

[0032] By starting the servo motor 401, the servo motor 401 drives the drive screw 402 connected to its output end to rotate. Since the drive screw 402 and the T-type screw nut 405 are connected by a threaded transmission, the rotational motion of the drive screw 402 is converted into the linear motion of the T-type screw nut 405 along the axial direction, thereby driving the T-type screw nut 405 to rise or fall.

[0033] Since the T-type screw nut 405 and the mass block fixing seat ear plate 404 adopt a floating lap connection (non-rigid connection), the mass block fixing seat ear plate 404 is pressed onto the top surface of the T-type screw nut 405 only by its own weight, and there is no mechanical locking structure between the two.

[0034] The working process of mass block lifting and mechanical decoupling is as follows: (1) Mass block lifting stage: When it is necessary to replace the main body 5 of the test piece, start the servo motor 401 to rotate forward, drive the lead screw 402 to rotate and drive the T-type lead screw nut 405 to rise. The top surface of the T-type lead screw nut 405 lifts the mass block fixing seat ear plate 404, thereby driving the spring-loaded mass block fixing seat 8 and the mass block body 12 fixedly connected to the mass block fixing seat ear plate 404 to rise as a whole, providing operating space for replacing the main body 5 of the test piece.

[0035] (2) Mechanical decoupling stage: After the main body 5 of the test piece is installed, the servo motor 401 is started to reverse and drive the lead screw 402 to rotate in the opposite direction, causing the T-shaped lead screw nut 405 to descend. Since the mass block fixing seat ear plate 404 is fixedly connected to the spring mass block fixing seat 8, and the spring mass block fixing seat 8 is slidably connected to the spring mass block guide device 3 through the heavy-duty guide rail 10 and is limited by the buffer pad 11, when the T-shaped lead screw nut 405 descends to the point where its top surface is separated from the bottom surface of the mass block fixing seat ear plate 404, a gap is formed between the T-shaped lead screw nut 405 and the mass block fixing seat ear plate 404, and the two are completely separated, realizing mechanical decoupling.

[0036] (3) Testing phase: After mechanical decoupling, there is no mechanical constraint between the mass block lifting device 4, the spring mass block fixing seat 8, and the mass block body 12. The mass block body 12 can slide freely on the heavy-duty guide rail 10, which truly simulates the dynamic inertial characteristics of the spring mass and ensures that the test data is not affected by additional mechanical constraints.

[0037] To facilitate understanding, the connection relationships of the various components in the mass block lifting device 4 are summarized and explained below. (See attached text.) Figure 9 : Connection relationship 1 (Area A) -- Between drive screw 402 and T-type screw nut 405: The connection adopts a threaded transmission connection. The T-shaped screw nut 405 is sleeved on the drive screw 402. The two achieve transmission through threaded engagement. When the drive screw 402 rotates, the T-shaped screw nut 405 reciprocates linearly along the axial direction of the drive screw 402. This connection is a rigid transmission connection, and the two cannot be separated during the transmission process.

[0038] Connection Relationship 2 (Area B) -- Between T-type lead screw nut 405 and mass block fixing seat ear plate 404: A floating lap connection is adopted, with the bottom surface of the mass block fixing seat ear plate 404 resting on the top surface of the T-shaped screw nut 405. There are no rigid fixing structures such as bolts, pins, or welding between the two. The mass block fixing seat ear plate 404 relies solely on its own weight (and the weight of the spring-loaded mass block fixing seat 8 and the mass block body 12 above it) to press on the T-shaped screw nut 405. When the T-shaped screw nut 405 descends, it can completely disengage from the mass block fixing seat ear plate 404, forming a gap and achieving mechanical decoupling.

[0039] Connection Relationship 3 (Area C) -- Between the mass block fixing lug 404 and the spring-loaded mass block fixing seat 8: A fixed connection is adopted. The mass block fixing seat ear plate 404 and the spring-loaded mass block fixing seat 8 are rigidly fixedly connected by welding or bolts. The two remain relatively stationary and move synchronously during the operation.

[0040] The purpose of the above connection relationship is to achieve the lifting and lowering control of the mass block body 12 through the threaded transmission in area A; The mechanical decoupling during the testing phase is achieved through the floating overlap in region B, ensuring that the mass block body 12 is not mechanically constrained by the mass block lifting device 4 during the testing process, and can realistically simulate the dynamic inertial characteristics of the sprung mass. The fixed connection in area C ensures the synchronous movement of the mass block fixing seat ear plate 404 and the spring-loaded mass block fixing seat 8.

[0041] It can be matched with various types of test parts 5. Only the support base 201 needs to be customized according to the specific test object to achieve quick docking. In addition, the system supports the quick replacement of the test part 5. The replacement process of the mass block body 12 is efficiently solved by a specially designed mass block lifting device 4. This mechanism uses a servo motor 401 to drive the mass block body 12 in combination with the drive screw 402 to smoothly and accurately lift the mass block body 12. The mass block body 12 and the mass block lifting device 4 adopt an overlapping connection, which can achieve mechanical decoupling during the test and ensure that the measurement is not affected by additional mechanical constraints.

[0042] The actuator assembly 2 and the sprung mass block guide device 3 are bolted to the iron floor 1. Their relative positions can be adjusted according to actual conditions. The actuator assembly 2 simulates real road excitation and vehicle response. By simulating road surface unevenness through the actuator assembly 2 itself, it can realistically simulate the dynamic behavior of a single wheel in real driving. Its main functions are as follows: 1) Verification of control algorithms: Researchers can develop and test various advanced suspension control algorithms in a safe, controlled, and repeatable laboratory environment; 2) Testing actuator hardware performance: It can evaluate the key performance indicators of actuator components 2 based on different principles such as electro-hydraulic, electromagnetic, and linear motors, including response speed, output range, power consumption, durability, and accuracy, providing direct experimental data for the selection and design of actuator components 2 in actual vehicles.

[0043] In this embodiment, the drive mechanism of actuator assembly 2 can select different types of actuators according to different test scenarios, specifically: In performance testing scenarios with low load and high speed response, linear motor actuators are preferred as the drive mechanism. Linear motor actuators have advantages such as fast response speed (response frequency can reach 50Hz to 100Hz), high control accuracy, and no mechanical transmission backlash, making them suitable for rapid verification of suspension control algorithms and high-frequency dynamic characteristic testing.

[0044] In heavy-load or durability testing scenarios, hydraulic actuators are preferred as the drive mechanism. Hydraulic actuators have advantages such as large output force (up to 50kN to 100kN), strong load-bearing capacity, and suitability for long-term continuous operation. They are suitable for fatigue durability testing of suspension systems and simulation of large load conditions.

[0045] To enable flexible switching between the two types of actuators, the bottom of the support base 201 is equipped with a standardized installation interface. This installation interface includes multiple evenly distributed threaded holes. The diameter and spacing of the threaded holes are designed according to the general installation specifications of linear motor actuators and hydraulic actuators. Specifically, the installation interface uses M12 threaded holes arranged in a matrix with a hole spacing of 100mm×100mm, which is compatible with mainstream linear motor actuators and hydraulic actuators on the market. When replacing the actuator, it is only necessary to remove the connecting bolts between the support base 201 and the actuator, take out the original actuator, and then align the new actuator with the threaded holes of the installation interface for installation and fixation. The replacement time does not exceed 30 minutes.

[0046] In addition, hydraulic oil circuit interface and electrical interface are reserved on the iron floor 1. The hydraulic oil circuit interface is located on the side of the iron floor 1 near the actuator assembly 2. It adopts quick-connect hydraulic connector and can be quickly connected to an external hydraulic station. The electrical interface uses an aviation plug to connect the driver and control signal lines of the linear motor actuator.

[0047] like Figure 7 It can be seen that the spring mass block guide device 3 is provided with a spring mass block fixing seat 8 at one end near the first test piece fixing bracket 6 and the second test piece fixing bracket 7, and the spring mass block fixing seat 8 and the spring mass block guide device 3 are connected by bolts. The first test piece fixing bracket 6 and the second test piece fixing bracket 7 are respectively threadedly connected to the spring mass block fixing seat 8 with locking bolts 9.

[0048] The traditional "fixed beam frame structure" cannot simulate the impact of sprung mass on the suspension system and cannot reflect the dynamic inertial characteristics of the sprung mass of a real vehicle, resulting in distorted evaluation of the suspension control algorithm. By replacing the sprung mass block fixing seat 8 of the fixed mass block with a sliding guide rail device, and by adding or removing the mass block body 12 as needed in actual tests, the changes in the real sprung mass can be effectively simulated, improving the adaptability of the test and the reliability of the data.

[0049] like Figure 3 It can be seen that a heavy-duty guide rail 10 connected by bolts is provided at one end of the spring mass block guide device 3 near the spring mass block fixing seat 8, and the heavy-duty guide rail 10 is symmetrically distributed on the surface of the spring mass block guide device 3.

[0050] Furthermore, the spring-loaded mass block fixing seat 8 and the heavy-duty guide rail 10 form a sliding connection, which improves the mobility of the equipment. As the spring-loaded mass block fixing seat 8 moves, the mass block body 12 can be moved up or down.

[0051] Both ends of the spring mass block guide device 3 are provided with buffer pads 11, and the end of the spring mass block fixing seat 8 away from the spring mass block guide device 3 is provided with a uniformly distributed mass block body 12.

[0052] The buffer pads 11 are symmetrically distributed and can provide cushioning when moving to the edge, avoiding direct metal collision between the test piece body 5 at the top of the actuator assembly 2 and the spring mass block guide device 3, thus preventing damage. They can also effectively absorb impact energy, limit the movement stroke, and ensure the stability of test data.

[0053] The mass block body 12 is composed of several standard mass blocks. By adding or removing mass blocks, the sprung mass can be accurately simulated. The mass block body 12 and the sprung mass block fixing seat 8 are connected by a heavy-duty guide rail 10. This connection method effectively reduces friction during movement and ensures that the mass block body 12 can move smoothly.

[0054] Working principle: The test part 5 is placed on top of the wheel fixing device 203 and locked by the strap 204. The wheel fixing device 203 adopts a groove design, which can accurately place the test part 5 in the center of the actuator assembly 2, thus preventing the wheel from running off course. The strap 204 helps to stabilize the test part 5. The test part 5 is locked by the first test part fixing bracket 6 and the second test part fixing bracket 7. After locking, an appropriate number of mass blocks 12 can be selected, which can be accurately increased or decreased. Simulating sprung mass, and through the activation of the mass block lifting device 4, the servo motor 401 can be activated to rotate the drive screw 402 connected to the output shaft. As the drive screw 402 rotates, the T-shaped screw nut 405 with surface thread connection can rise or fall. With the cooperation of the actuator assembly 2, the road surface can be simulated to excite the wheel. The setting of the bellows cover 202 can avoid motion interference. At the same time, through the cooperation of the sprung mass block fixing seat 8 and the mass block lifting device 4, it can follow the movement, which can realistically simulate the dynamic behavior of a single wheel in real driving.

[0055] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A comprehensive test bench for a quarter-wheel active suspension of a new energy vehicle, comprising a steel floor (1), characterized in that: An actuator assembly (2) is provided at one end of the iron floor (1), a spring-loaded mass block guide device (3) is provided on the side of the iron floor (1) near the actuator assembly (2), a mass block lifting device (4) is installed at the top of the spring-loaded mass block guide device (3), and a test piece body (5) is provided at the top of the actuator assembly (2). The spring mass block guide device (3) is provided with a first test piece fixing bracket (6) connected by bolts at one end near the test piece body (5), and a second test piece fixing bracket (7) is provided at the other end of the spring mass block guide device (3) away from the first test piece fixing bracket (6), and the second test piece fixing bracket (7) is connected to the spring mass block guide device (3) by bolts. The spring mass block guide device (3) is provided with a spring mass block fixing seat (8) at one end near the first test piece fixing bracket (6) and the second test piece fixing bracket (7). The spring mass block guide device (3) is provided with a heavy-duty guide rail (10) at one end near the spring mass block fixing seat (8). The spring mass block fixing seat (8) is slidably connected to the heavy-duty guide rail (10). The spring mass block fixing seat (8) is provided with a detachable mass block body (12) at one end away from the spring mass block guide device (3).

2. The comprehensive test bench for a quarter-load active suspension of a new energy vehicle according to claim 1, characterized in that: The actuator assembly (2) includes a support base (201) bolted to the top of the iron floor (1), and a accordion cover (202) is provided on the top of the support base (201).

3. A comprehensive test bench for a quarter-load active suspension of a new energy vehicle according to claim 2, characterized in that: The end of the bellows cover (202) away from the support base (201) is provided with a wheel fixing device (203). The wheel fixing device (203) is U-shaped. One end of the wheel fixing device (203) is connected to a strap (204) for stabilizing and limiting the main body (5) of the test piece. A placement seat (205) is provided between the support base (201) and the wheel fixing device (203).

4. A comprehensive test bench for a quarter-load active suspension of a new energy vehicle according to claim 1, characterized in that: The mass block lifting device (4) includes a servo motor (401) installed at the top of the spring-loaded mass block guide device (3), and the output end of the servo motor (401) is connected to a drive screw (402).

5. A comprehensive test bench for a quarter-load active suspension of a new energy vehicle according to claim 4, characterized in that: The drive screw (402) is connected to the output end of the servo motor (401) via a coupling (403). A T-shaped screw nut (405) is threaded onto the drive screw (402). A mass block fixing seat ear plate (404) floats and overlaps above the T-shaped screw nut (405). The mass block fixing seat ear plate (404) is fixedly connected to the spring-loaded mass block fixing seat (8).

6. A comprehensive test bench for a quarter-load active suspension of a new energy vehicle according to claim 5, characterized in that: The T-shaped lead screw nut (405) and the mass block fixing seat ear plate (404) are in a floating lap fit. The mass block fixing seat ear plate (404) is pressed onto the top surface of the T-shaped lead screw nut (405) by its own weight. When the T-shaped lead screw nut (405) descends along the drive screw (402) to disengage from the mass block fixing seat ear plate (404), mechanical decoupling is achieved.

7. A comprehensive test bench for a quarter-load active suspension of a new energy vehicle according to claim 1, characterized in that: The spring mass block fixing seat (8) and the spring mass block guiding device (3) are connected by bolts. The first test piece fixing bracket (6) and the second test piece fixing bracket (7) are respectively threadedly connected to the spring mass block fixing seat (8) with locking bolts (9).

8. A comprehensive test bench for a quarter-load active suspension of a new energy vehicle according to claim 7, characterized in that: The heavy-duty guide rail (10) is connected to the spring mass block guide device (3) by bolts, and the heavy-duty guide rail (10) is symmetrically distributed on the surface of the spring mass block guide device (3).

9. A comprehensive test bench for a quarter-load active suspension of a new energy vehicle according to claim 8, characterized in that: Both ends of the spring-loaded mass block guide device (3) are provided with buffer pads (11), and the mass block body (12) is evenly distributed on the spring-loaded mass block fixing seat (8).

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