A suspension dynamic test system

Abstract

The present invention relates to a suspension dynamic test system, which includes a vehicle dynamic test bench. The vehicle dynamic test bench includes at least one road excitation simulation bench, and the road excitation simulation bench at least includes an electric actuator unit, a support platform, an elastic support unit and a support frame. At least one three-dimensional frame capable of accommodating the electric actuator unit is built on the support frame, and the electric actuator unit is installed in an inverted manner on the lower plate surface of the top plate body formed on the axial upper end surface of the three-dimensional frame, so that the electric actuator unit can extend downward along its axis, and the support platform connected to the axial lower end of the electric actuator unit can move up and down following the expansion and contraction of the electric actuator unit. In addition, the present invention also relates to a suspension dynamic test device.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle dynamic test benches, and in particular to a suspension dynamic test system. Background Art

[0002] Currently, in the automotive field, vehicle dynamic test benches are often used to evaluate the dynamic performance of vehicle bodies and suspensions. The commonly used vehicle dynamic test bench is a four-channel vehicle dynamic test bench. The hydraulic actuator of the vehicle dynamic test bench supports the wheel through a wheel bearing device, and the vehicle dynamic test bench adjusts the placement position of the hydraulic actuator to accommodate vehicles of different sizes. The vehicle dynamic test bench simulates the road surface input through the hydraulic actuator, thereby being able to effectively study the dynamic performance of the vehicle body and suspension.

[0003] However, the fluid medium of the hydraulic actuator of this kind of vehicle dynamic test bench has a large resistance when flowing, and it is easy to cause a large amount of fluid medium leakage, resulting in low working efficiency of the hydraulic actuator; if not properly handled during application, the leakage of the fluid medium will not only pollute the site, but may also cause fire and explosion accidents. Since the working performance of the hydraulic actuator is easily affected by temperature changes, the hydraulic actuator is not suitable for working under too high or too low temperature conditions. The manufacturing precision requirements for the internal components of the hydraulic actuator are relatively high, so the use cost of the hydraulic actuator is relatively high and the practicability is relatively low. In addition, the hydraulic actuator does not have a strict transmission ratio due to the leakage of the fluid medium and the change of compressibility; at the same time, it is not easy to find the cause when the hydraulic actuator has a transmission failure, and the technical level requirements for the user to perform operations such as use, maintenance, and care are relatively high, making the use environment of the hydraulic actuator relatively poor and the cost relatively high. Usually, the plane where the platform for carrying the wheel of the vehicle dynamic test bench is located is much higher than the ground, so that the whole vehicle test bench to be tested needs to be placed on the vehicle dynamic test bench through a large amount of manpower or machinery, and there is a certain danger in this process. Usually, in order to meet the test requirements, the user needs to select a hydraulic cylinder with a larger power, which will also greatly increase the cost of the vehicle dynamic test bench.

[0004] The patent document with the publication number CN113465949A discloses a test system for an automotive suspension system. The test system includes a plurality of adjustable shock absorbers, a plurality of air springs, a control device, and a plurality of sensors; the plurality of adjustable shock absorbers are used to connect with the suspension to be developed; the plurality of air springs are used to connect with the suspension to be developed; the control device is electrically connected to the plurality of adjustable shock absorbers, and the control device is used to supply current to the plurality of adjustable shock absorbers, thereby controlling the damping coefficient of the adjustable shock absorbers; the control device is also electrically connected to the plurality of air springs, and the control device is used to control the charging and discharging states of the plurality of air springs, thereby adjusting the support stiffness and support length of the air springs; the plurality of sensors are used to connect with the suspension to be developed, thereby detecting the acceleration and speed of the suspension to be developed in the vibration direction in real time.

[0005] The patent document with the publication number CN103913315A discloses a suspension system performance test device. The suspension system performance test device includes a KC test bench connected to a wheel and a support frame provided on the KC test bench; on the support frame, there are a link mounting bracket for fixing a link and a shock absorber mounting bracket for fixing a shock absorber; this patent can realize the test and optimization of the suspension system performance in the early stage of vehicle development, thereby improving the suspension system performance and reducing the development cost. However, this device does not optimize the connection structure between the support platform of the test device and the support frame, and there are still defects such as too high initial support height of the suspension.

[0006] Therefore, aiming at the defects of the prior art, a suspension dynamic test system that can avoid using a hydraulic actuator as a support height adjustment mechanism is needed, especially a suspension dynamic test system that can further improve the test environment of the vehicle dynamic test bench and reduce the risk coefficient during the test process.

[0007] In addition, on the one hand, there are differences in the understanding of those skilled in the art; on the other hand, although the inventor studied a large number of documents and patents when making this invention, all details and contents are not listed in detail due to space limitations. However, this does not mean that this invention does not possess the features of these prior arts. On the contrary, this invention already possesses all the features of the prior arts, and the applicant reserves the right to add relevant prior arts in the background art. Summary of the Invention

[0008] In view of the deficiencies of the prior art, the technical solution of the present invention provides a suspension dynamic test system, which includes a vehicle dynamic test bench for testing the dynamic performance of the vehicle body and the suspension. The vehicle dynamic test bench is provided with at least one road surface excitation simulation bench in a manner corresponding to the number of wheels to be supported by the vehicle. It is characterized in that the road surface excitation simulation bench at least includes an electric actuator unit, a support platform, an elastic support unit and a support frame. Among them, at least one three-dimensional frame capable of accommodating the electric actuator unit is built on the support frame, and the electric actuator unit is installed on the lower plate surface of the top plate body formed on the axial end surface of the three-dimensional frame in an inverted manner, so that the electric actuator unit performs telescopic movement along its own axis in a manner that can change the support height of the support platform; an elastic support unit that supports on the bottom plate body of the support frame is also connected to the lower end surface of the support platform, and the electric actuator unit can cooperate with the elastic support unit to enable the support platform to move up and down following the telescopic movement of the electric actuator unit. Its advantages are as follows. By improving the structure of the road surface excitation simulation bench, compared with the existing drive module (hydraulic actuator) of the road surface excitation simulation bench, the present application adopts a combined structure of an electric actuator unit and an elastic support unit to provide the driving force for simulating the road surface excitation effect. Among them, in order to reduce the minimum distance between the support platform for supporting the vehicle and the ground, the electric actuator unit is arranged on the upper surface of the support platform in an inverted manner. Compared with the direct support structure of the existing hydraulic support, the inverted electric actuator unit can shorten the height of the support platform limited by it from the ground to a certain extent, eliminating the limitation of the shortest length of the hydraulic support on the lowest support height of the support platform, enabling the support platform to reduce the distance between it and the ground according to requirements, and enabling the operator to more conveniently transfer the vehicle or the suspension structure to the support platform. Therefore, when transferring or installing the vehicle or the suspension structure, the operator does not need to lift the vehicle or the suspension structure weighing several tons to a large height. In addition, the reduction of the support height can also improve the controllability of the vehicle or the suspension structure on the support platform. The operator can perform relevant operations on the ground without standing on a height lifting device for transferring, fixing and testing the vehicle or the suspension structure, indirectly improving the safety of the operator during the test.This application adjusts the working mode of "simulating road excitation under the action of the supporting force provided by the hydraulic support device" of the support platform to the working mode of "simulating road excitation under the action of the traction force provided by the electric actuator unit", avoiding the situation that due to its own wear and the leakage of hydraulic oil, when the hydraulic support device is about to rise to the highest point of the upward movement path and drive the support platform, it cannot provide sufficient supporting force due to insufficient hydraulic pressure. Especially in the process of the support platform driving the vehicle or suspension structure to lift, it is a process with increasing gravity. As the supporting height increases, there is a certain force decomposition of the supporting force of the hydraulic support device, so it cannot effectively provide sufficient supporting force. Therefore, this application installs the electric actuator unit in an inverted manner, making the shortening process of the length of the electric actuator unit consistent with the process of the support platform driving the vehicle or suspension structure to lift, ensuring that it provides sufficient traction force. When the hydraulic support device is in use, it requires position detection and precision electro-hydraulic valve components. Especially in the case of hydraulic oil leakage, it may also experience crawling. In contrast, the electric actuator unit has good repeatability and can perform multiple rigid brakings continuously, so it can better simulate the undulating motion process.

[0009] Compared with a single hydraulic support device, on the basis of setting the inverted electric actuator unit, this application also installs an elastic support unit on the lower surface of the support platform, which can provide a second driving force for the support platform, enabling it to act together with the electric actuator unit to provide a driving force for the support platform to simulate road excitation. Especially, the elastic support unit can generate a driving force in the same or opposite direction as the traction force of the electric actuator unit at different heights, enabling the support platform to more realistically simulate road excitation conditions, so that the relevant sensing units can monitor the motion parameters of the vehicle or suspension structure on the support platform under more realistic road excitation conditions, and thus more accurately obtain the performance parameters of the vehicle or suspension structure.

[0010] According to a preferred embodiment, the elastic support unit can define the initial height of the support platform when the vehicle bench is placed on the vehicle dynamic test bench, so that the electric actuator unit drives the support platform to move upward along the axis of the electric actuator unit, enabling the support platform to simulate road excitation conditions. Its advantage is that the elastic support unit can cooperate with the electric actuator unit, enabling the support platform to more vividly simulate ground excitation conditions, thereby effectively reducing the working power of the electric actuator unit and greatly reducing the manufacturing cost.

[0011] According to a preferred embodiment, part of the bottom plate is located outside the space defined by the three-dimensional frame, and the elastic support unit is supported on this part of the bottom plate, so that the elastic support unit can be located directly below the tires of the vehicle stand, and the elastic support unit is connected to the outer end of the support platform.

[0012] According to a preferred embodiment, the inner end of the support platform is connected to the three-dimensional frame via a linear guide rail, and the linear guide rail is arranged on the support column of the support frame, so that the inner end of the support platform can follow the extension and retraction of the electric actuator unit and reciprocate on the linear guide rail, thereby driving the outer end of the support platform to perform ups and downs movement.

[0013] According to a preferred embodiment, a plurality of sensor units capable of monitoring the motion parameter information of the vehicle platform are also installed on the support platform. The sensor units can collect the motion parameter information of the vehicle platform when it follows the support platform to perform ups and downs motion, and feed the collected motion parameter information back to the control cabinet. The advantage is that by positioning the sensor units, the sensor units can accurately collect the real-time motion parameter information of the vehicle platform during the ups and downs motion, thereby obtaining relevant information about the smoothness of the vehicle platform.

[0014] According to a preferred embodiment, a motor drive unit capable of controlling at least one of the electric actuators to perform an undulating motion and a controller capable of receiving motion parameter information fed back by the sensor unit are arranged in the control cabinet.

[0015] According to a preferred embodiment, the sensing unit includes at least an acceleration sensing unit, a displacement sensing unit capable of monitoring the position of the whole vehicle frame on the supporting platform, and a force sensing unit, wherein the force sensing unit can obtain the supporting force of the supporting platform when it stably supports the whole vehicle frame and / or drives the whole vehicle frame to perform up and down motion.

[0016] The technical solution of the present invention further provides a road surface excitation simulation system, which at least includes an electric actuator unit, a support platform, an elastic support unit and a support frame. Among them, at least one three-dimensional frame capable of accommodating the electric actuator unit is built on the support frame, and the electric actuator unit is installed in an inverted manner on the lower plate surface of the top plate body formed on the axial end surface of the three-dimensional frame, so that the electric actuator unit performs telescopic movement along its own axis in a manner that can change the support height of the support platform; the lower end surface of the support platform is also connected with an elastic support unit supported on the bottom plate body of the support frame, and the electric actuator unit can work in cooperation with the elastic support unit, so that the support platform can follow the telescopic movement of the electric actuator unit to perform undulating movement. Its advantage is that the road surface excitation simulation platform of a suspension dynamic test system provided by the present invention uses an electric actuator unit to replace the existing hydraulic actuator, improves the environment of the vehicle dynamic test bench, and reduces cost consumption. The road surface excitation simulation platform installs the electric actuator unit in the support frame in an inverted manner, thereby effectively reducing the height difference between the support platform of the tire supporting the whole vehicle bench and the ground, reducing the danger during the test, and increasing the flexibility of the layout during the test. In addition, the sensing unit installed on the vehicle dynamic test bench of the present application can accurately provide the motion parameter information of the whole vehicle bench. Thus, it is simpler, more convenient, safer and more labor-saving to study the dynamics of the vehicle body and suspension of the whole vehicle bench.

[0017] The technical solution of the present invention further provides a suspension dynamic test device, which at least includes at least one test structure constructed by the road surface excitation simulation platform in the above content. The test structure can selectively support the whole vehicle bench of a multi-axle vehicle, and the road surface excitation simulation platform enables the sensing unit arranged on the vehicle frame to monitor the real-time changing motion parameter information by driving the wheels of the whole vehicle bench to move. Its advantage is that the road surface excitation simulation platform of a suspension dynamic test system provided by the present invention uses an electric actuator unit to replace the existing hydraulic actuator, improves the environment of the vehicle dynamic test bench, and reduces the replacement cost of components such as the electric actuator unit. The road surface excitation simulation platform installs the electric actuator unit in the support frame in an inverted manner, thereby effectively reducing the height difference between the support platform of the tire supporting the whole vehicle bench and the ground, reducing the danger during the test, and increasing the flexibility of the layout during the test. In addition, the sensing unit installed on the vehicle dynamic test bench of the present application can accurately provide the motion parameter information of the whole vehicle bench. Thus, it is simpler, more convenient, safer and more labor-saving to study the dynamics of the vehicle body and suspension of the whole vehicle bench. In addition, the road surface excitation simulation platform of the present application can also collect the motion parameter information of other benches such as a half vehicle, a quarter vehicle body or a three-axle vehicle, so as to more accurately complete the research on the dynamic performance of the vehicle body and suspension.

[0018] According to a preferred embodiment, the test structure supports at least one of the wheels such that the road surface excitation simulation platform provided in the test structure can be matched with the wheels. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the working process of a preferred suspension dynamic test system proposed by the present invention;

[0020] Figure 2 is a schematic diagram of the structure of a single road surface excitation simulation platform of a preferred suspension dynamic test system proposed by the present invention with a tire and a vehicle frame added;

[0021] Figure 3 is a schematic diagram of the structure of a single road surface excitation simulation platform of a preferred suspension dynamic test system proposed by the present invention;

[0022] Figure 4 is a front view of a single road surface excitation simulation platform of a preferred suspension dynamic test system proposed by the present invention;

[0023] Figure 5 is a rear view of a single road surface excitation simulation platform of a preferred suspension dynamic test system proposed by the present invention;

[0024] Figure 6 is a schematic diagram of the installation position of an acceleration sensing unit of a preferred suspension dynamic test system proposed by the present invention;

[0025] Figure 7 is a schematic diagram of the structure of a control cabinet of a preferred suspension dynamic test system proposed by the present invention;

[0026] Figure 8 is a schematic diagram of the control circuit of an electric actuator unit of a road surface excitation simulation platform of a preferred suspension dynamic test system proposed by the present invention;

[0027] Figure 9 is a schematic diagram of information acquisition of a force sensing unit and an acceleration sensing unit of a preferred suspension dynamic test system proposed by the present invention.

[0028] Figure 10 is a schematic diagram of the installation position of a displacement sensing unit of a road surface excitation simulation platform of a preferred suspension dynamic test system proposed by the present invention.

[0029] Figure 11 is a left view of the installation position of a force sensing unit of a road surface excitation simulation platform of a preferred suspension dynamic test system proposed by the present invention.

[0030] Figure 12 It is a right view of the installation position of the force sensing unit of the road surface excitation simulation platform of a preferred suspension dynamic test system proposed by the present invention.

[0031] Figure 13 It is a schematic structural diagram of a quarter vehicle test bench of a preferred suspension dynamic test device proposed by the present invention.

[0032] Figure 14 It is a schematic diagram of the installation positions of the force sensing unit, acceleration sensing unit and displacement sensing unit of a quarter vehicle test bench of a preferred suspension dynamic test device proposed by the present invention.

[0033] Figure 15 It is a schematic diagram of the control circuit of the electric actuator unit of the road surface excitation simulation platform in a quarter vehicle test bench of a preferred suspension dynamic test device proposed by the present invention.

[0034] Figure 16 It is a schematic diagram of the information acquisition of the force sensing unit, acceleration sensing unit and displacement sensing unit in a quarter vehicle test bench of a preferred suspension dynamic test device proposed by the present invention.

[0035] List of reference numerals

[0036] 1: Control cabinet; 2: Vehicle dynamic test bench; 3: Linear guide rail; 4: Sensing unit; 5: Vehicle test bench; 6: Electric actuator unit; 7: Support platform; 8: Elastic support unit; 9: Support frame; 11: Motor drive unit; 12: Controller; 21: First road surface excitation simulation platform; 22: Second road surface excitation simulation platform; 23: Third road surface excitation simulation platform; 24: Fourth road surface excitation simulation platform; 31: First linear guide rail; 32: Second linear guide rail; 33: Third linear guide rail; 34: Fourth linear guide rail; 41: Acceleration sensing unit; 42: Displacement sensing unit; 43: Force sensing unit; 411: First acceleration sensing unit; 412: Second acceleration sensing unit; 413: Third acceleration sensing unit; 414: Fourth acceleration sensing unit; 415: Fifth acceleration sensing unit; 416: Sixth acceleration sensing unit; 417: Seventh acceleration sensing unit; 421: First displacement sensing unit; 422: Second displacement sensing unit; 423: Third displacement sensing unit; 424: Fourth displacement sensing unit; 431: First force sensing unit; 432: Second force sensing unit; 433: Third force sensing unit; 434: Fourth force sensing unit; 51: Vehicle body; 52: Wheel; 53: Frame; 91: Top plate body; 92: Bottom plate body; 93: Support column. Detailed implementation manners

[0037] The following is a detailed description with reference to the accompanying drawings.

[0038] Embodiment 1

[0039] This application provides a suspension dynamic test system, which includes a control cabinet 1, a vehicle dynamic test bench 2, a sensing unit 4, and a vehicle bench 5.

[0040] According to a specific embodiment, the vehicle dynamic test bench 2 can drive the vehicle bench 5 placed on it to perform up-and-down undulating movements according to the control instructions issued by the controller 12. The sensing unit 4 is arranged on the vehicle dynamic test bench 2 and the vehicle bench 5 in a manner capable of monitoring the motion parameters of the vehicle bench 5. The sensing unit 4 can collect motion parameters such as acceleration, position, and pressure of the vehicle bench 5 when following the vehicle dynamic test bench 2, and feedback the collected motion parameters to the controller 12. The controller 12 analyzes and processes the received motion parameters to obtain the dynamic performance of the vehicle bench 5.

[0041] Preferably, the vehicle dynamic test bench 2 is provided with four road surface excitation simulation platforms in a manner corresponding to the number of wheels to be supported, that is, the vehicle dynamic test bench 2 is composed of a first road surface excitation simulation platform 21, a second road surface excitation simulation platform 22, a third road surface excitation simulation platform 23, and a fourth road surface excitation simulation platform 24 that respectively support the wheels 52 of the vehicle bench 5. Preferably, the vehicle bench 5 can be either a complete vehicle or a separate suspension structure. For example Figure 2As shown, any road surface excitation simulation platform includes an electric actuator unit 6, a support platform 7, an elastic support unit 8, and a support frame 9. Preferably, the support frame 9 includes a top plate body 91, a bottom plate body 92, and support columns 93. Support columns 93 perpendicular to the plate surface are respectively connected to the four plate corners of the top plate body 91. The support columns 93 are vertically arranged on the bottom plate body 92, so that the top plate body 91 is supported above the bottom plate body 92. Preferably, the plate area of the bottom plate body 92 is larger than that of the top plate body 91, so that a part of the plate surface of the bottom plate body 92 is located outside the three-dimensional frame defined by the top plate body 91, the bottom plate body 92, and the support columns 93. Preferably, the size of the cross-section of the three-dimensional frame is defined by the size of the plate area of the top plate body 91, and the height of the three-dimensional frame is defined by the length of the support columns 93. Preferably, the elastic support unit 8 is further arranged on the part of the plate surface of the bottom plate body 92 extending outside the three-dimensional frame. Preferably, the electric actuator unit 6 is connected to the top plate body 91 in an inverted installation manner in the three-dimensional frame. Specifically, the electric actuator unit 6 is inverted so that the bottom of the electric actuator unit 6 is at the upper end of its axis and the top of the electric actuator unit 6 is at the lower end of its axis. The bottom of the electric actuator unit 6 is fixedly installed on the lower plate surface of the top plate body 91, so that the electric actuator unit 6 is located within the space defined by the three-dimensional frame, and one end of the electric actuator unit 6 away from the top plate body 91 extends in a manner of gradually approaching the bottom plate body 92. Preferably, a support platform 7 is further connected to the top of the electric actuator unit 6. The plane defined by the support platform 7 is parallel to the top plate body 91, and the area of the support platform 7 can be equal to the area of the bottom plate body 92, so that the support platform 7 includes an inner end located within the three-dimensional frame and an outer end located outside the three-dimensional frame. Preferably, the inner end of the support platform 7 located within the three-dimensional frame is movably connected to the support columns 93 through linear guide rails 3, so that the support platform 7 can move up and down along the axis of the support columns 93. The setting method of the electric actuator unit 6 of the present invention effectively reduces the height difference between the support platform 7 for fixing the wheels 52 and the ground, reduces the danger of the operator during the test, increases the flexibility of the structural arrangement during the test, so that the operator can more safely and labor-savingly complete the transfer, installation, and test of the vehicle bench 5.

[0042] The initial length of the elastic support unit 8 (referring to the length without external force) is between the shortest length and the longest length of the electric actuator unit 6. When the electric actuator unit 6 drives the support platform 7 down to the lowest height and the vehicle bench 5 is fixed on the support platform 7, the elastic support unit 8 is in a compressed state, which can provide an upward support force for the support platform 7, thereby reducing the support force required by the electric actuator unit 6, reducing the driving force required by the electric actuator unit 6, avoiding the risk of overload during the process of the electric actuator unit 6 driving the support platform 7 to simulate road surface excitation, and thus extending the service life of the electric actuator unit 6. During the process of the electric actuator unit 6 driving the support platform 7 to rise, the elastic potential energy stored in the compressed elastic support unit 8 is released, enabling the electric actuator unit 6 and the elastic support unit 8 to provide a greater driving force for the support platform 7 in the initial rising stage, enabling it to more specifically simulate the high kinetic energy state at the initial stage of the rising motion of the vehicle when triggering road surface excitation conditions, so that the support platform 7 has a greater acceleration in the initial stage of the rising motion. As the support platform 7 rises, the driving force that the elastic support unit 8 can provide gradually decreases, so that the support platform 7 mainly continues to rise under the traction of the electric actuator unit 6. During this process, the acceleration of the support platform 7 gradually decreases. During the further rising motion of the support platform 7, the length of the elastic support unit 8 is gradually stretched. In this stage, the elastic support unit 8 no longer provides a support force to promote the movement of the support platform 7, but a pulling force in the opposite direction to the traction force provided by the electric actuator unit 6 that hinders the support platform 7 from continuing to rise. This process can further reduce the acceleration of the support platform 7, slow down the rising speed of the support platform 7 until the support platform 7 moves to the maximum height. In the next stage, the direction of the traction force provided by the electric actuator unit 6 changes, and it drives the support platform 7 to move downward. At this time, the direction of the pulling force of the elastic support unit 8 is the same as the direction of the traction force provided by the electric actuator unit 6, enabling the support platform 7 to have a greater acceleration in the initial stage of the descent. When the length of the elastic support unit 8 is less than its initial length, the elastic support unit 8 begins to provide a support force in the opposite direction to the movement direction of the support platform 7. The support force generated by the elastic support unit 8 can offset the traction force of the electric actuator unit 6, causing the traction force that the electric actuator unit 6 can provide to gradually decrease. The movement of the support platform 7 in this stage can vividly simulate the movement state of the vehicle after contacting the ground.Through the interaction or synergy of the above-mentioned electric actuator unit 6 and elastic support unit 8 at different stages, the support platform 7 can more accurately simulate the change of the vehicle's motion state when triggering road surface excitation conditions, enabling each sensing unit 4 on the vehicle test bench 5 (vehicle or suspension structure) to more accurately collect the changes in sensing parameters at different positions of the vehicle test bench 5 (vehicle or suspension structure), thereby helping the operator to perform structural reinforcement or vibration reduction treatment on different force-bearing areas of the vehicle test bench 5 (vehicle or suspension structure).

[0043] As Figure 3 、 4 and shown in Figure 5, the support platform 7 is connected to the support frame 9 through the first linear guide rail 31, the second linear guide rail 32, the third linear guide rail 33 and the fourth linear guide rail 34, making the support platform 7 parallel to the ground. The lower surface of the outer end of the support platform 7 is connected to the top end of the elastic support unit 8. One end of the elastic support unit 8 is connected to the support platform 7, and the other end of the elastic support unit 8 is connected to the bottom plate body 92. Each wheel 52 of the vehicle test bench 5 is fixed on the support platform 7. The elastic support unit 8 can provide the static load of the vehicle test bench 5, so that the electric actuator unit 6 is in an unoperated state in the initial stage, thereby reducing the power of the electric actuator unit 6 during operation. Preferably, the elastic support unit 8 can adopt a helical spring. Since the electric actuator unit 6 is connected to the support platform 7 in an inverted manner, the distance between the support platform 7 and the ground is greatly reduced. The present invention uses the electric actuator unit 6 to replace the original hydraulic actuator, thus improving the environment of the vehicle dynamic test bench 2 and reducing the manufacturing cost. In the prior art, the minimum support height of the hydraulic actuator is relatively large. When the operator transfers the vehicle test bench 5 to the support platform 7, a separate suspension device is required for assistance to complete the installation, and the installation height of the vehicle test bench 5 is too high, posing a relatively large risk of falling, seriously affecting the personal safety of the operator. Therefore, in this application, the electric actuator unit 6 for adjusting the height of the support platform is inverted on the lower plate surface of the top plate body 91, so that the initial height of the support platform 7 can be reduced as much as possible, facilitating the operator to transfer the vehicle test bench 5 to be tested onto the support platform 7. In addition, in this application, an elastic support unit 8 capable of providing an initial support force for the support platform 7 is introduced at the bottom of the support platform 7 to reduce the magnitude of the control force required to be output by the electric actuator unit 6 during the test, extend the service life of the electric actuator unit 6, avoid the damage of components when the electric actuator unit 6 outputs a large torque, greatly reduce the manufacturing cost, and at the same time reduce the component replacement cost of the vehicle dynamic test bench 2.

[0044] As Figure 3 shown, when the vehicle dynamic test bench 2 is working, the inverted electric actuator unit 6 expands and contracts to drive the support platform 7 to move.

[0045] As Figure 5 shown, since the support platform 7 is connected to the support frame 9 through the linear guide 3, the outer end of the support platform 7 moves synchronously with the inner end, so that the outer end of the support platform 7 drives the vehicle test bench 5 to move.

[0046] As Figure 1 shown, the first road surface excitation simulation platform 21, the second road surface excitation simulation platform 22, the third road surface excitation simulation platform 23 and the fourth road surface excitation simulation platform 24 can move up and down, so as to simulate the road surface excitation conditions.

[0047] As Figure 7 shown, the control cabinet 1 may include four motor drive units 11 and a controller 12. Preferably, the control cabinet 1 can be installed in the vehicle dynamic test bench 2.

[0048] As Figure 8 and 10 shown, the control loop of the electric actuator unit 6 of the road surface excitation simulation platform is connected to the controller 12. The controller 12 can send pulse signals to the four motor drive units 11 respectively. Each motor drive unit 11 drives the corresponding electric actuator unit 6 according to the signal sent by the controller 12. Each electric actuator unit 6 feeds back its encoder signal to the motor drive unit 11, and the electric actuator unit 6 drives the corresponding load position respectively (the first displacement sensing unit 421 at the load position of the first road surface excitation simulation platform 21; the second displacement sensing unit 422 at the load position of the second road surface excitation simulation platform 22; the third displacement sensing unit 423 at the load position of the third road surface excitation simulation platform 23; the fourth displacement sensing unit 424 at the load position of the fourth road surface excitation simulation platform 24), so that the displacement sensing unit 42 at the load position obtains sensor information. By feeding back the sensor information monitored by the displacement sensing units 42 set at different load positions to the controller 12, the controller 12 can obtain the accurate displacement information of the vehicle test bench 5 during the road surface excitation simulation.

[0049] As Figure 1 and 10 shown, when the road surface excitation simulated by the electric actuator unit 6 in the first road surface excitation simulation platform 21, the second road surface excitation simulation platform 22, the third road surface excitation simulation platform 23 and the fourth road surface excitation simulation platform 24 acts on the vehicle test bench, the displacement sensing unit 42 and the acceleration sensing unit 41 obtain the corresponding sensor information, and feed back the obtained sensor information to the controller 12. The controller 12 compresses and processes the sensor information and returns it to the host computer. The host computer can obtain the motion information of the center of mass of the vehicle test bench 5 and / or the wheels 52 by converting and calculating the sensor information.

[0050] As Figure 9 、 11 and shown in 12, the electric actuator unit 6 in the road surface excitation simulation platform simulates the working condition when the road surface excitation acts on the vehicle bench 5. The present invention obtains sensor information that can accurately represent the pressure information between the vehicle bench 5 and the support platform 7 during the road surface excitation simulation through the first force sensing unit 431, the second force sensing unit 432, the third force sensing unit 433, and the fourth force sensing unit 434 respectively arranged on the support platforms 7 of the first road surface excitation simulation platform 21, the second road surface excitation simulation platform 22, the third road surface excitation simulation platform 23, and the fourth road surface excitation simulation platform 24. At the same time, the collected sensor information is transmitted to the controller 12, and the controller 12 returns the sensor information to the upper computer for calculation and analysis, and then obtains the relevant analysis information of the tire dynamic load of the corresponding wheel 52.

[0051] As Figure 1 、 6 and shown in 9, when the electric actuator units 6 in the first road surface excitation simulation platform 21, the second road surface excitation simulation platform 22, the third road surface excitation simulation platform 23, and the fourth road surface excitation simulation platform 24 simulate the road surface excitation acting on the vehicle bench 5, the present invention obtains sensor information about acceleration that can accurately represent the different positions of the vehicle bench 5 during movement through the first acceleration sensing unit 411, the second acceleration sensing unit 412, the third acceleration sensing unit 413, the fourth acceleration sensing unit 414, the fifth acceleration sensing unit 415, the sixth acceleration sensing unit 416, and the seventh acceleration sensing unit 417 respectively arranged at different positions of the vehicle bench 5. At the same time, the collected sensor information is transmitted to the controller 12, and the controller 12 returns the sensor information to the upper computer for calculation and analysis, so as to obtain the relevant analysis information of the ride comfort of the vehicle specified in GB / T 4970-2009.

[0052] Embodiment 2

[0053] This embodiment is a further improvement of Embodiment 1, and the repeated content will not be elaborated.

[0054] A suspension dynamic test device includes a road surface excitation simulation platform, several sensors, a control cabinet 1, and a vehicle frame 53.

[0055] As Figure 13As shown, the road surface excitation simulation platform imitates road surface excitation through the up-and-down movement of the support platform 7, thereby driving the vehicle frame 53 to move. Preferably, the vehicle frame 53 defines a three-dimensional space. The vehicle frame 53 is connected to the wheels 52 and the vehicle body 51 through vertically arranged guide rails, and the vehicle body 51 is supported by the wheels 52 within the three-dimensional space defined by the vehicle frame 53. Preferably, the road surface excitation simulation platform is installed within the three-dimensional space defined by the vehicle frame 53, and the road surface excitation simulation platform can support the wheels 52, so that the road surface excitation simulation platform can drive the vehicle body 51 to perform up-and-down movement by driving the wheels 52 to perform up-and-down movement. Preferably, a displacement sensing unit 42 is connected to the side of the support platform 7 of the road surface excitation simulation platform, a force sensing unit 43 is arranged on the surface where the support platform 7 contacts the wheels 52, and an acceleration sensing unit 41 is arranged on the vehicle body 51. When the road surface excitation simulation platform drives the wheels 52 to move within the three-dimensional space defined by the vehicle frame 53, the acceleration sensing unit 41, the displacement sensing unit 42, and the force sensing unit 43 respectively obtain the acceleration, displacement, and wheel pressure changes of the entire vehicle test bench 5 during the road surface simulation movement.

[0056] As Figure 14 and 15 shown, the control circuit of the electric actuator unit 6 of the road surface excitation simulation platform is connected to the controller 12. The controller 12 can respectively send pulse signals to the motor drive unit 11, and the motor drive unit 11 drives the electric actuator unit 6 according to the signals sent by the controller 12. The electric actuator unit 6 feeds back the encoder signal to the motor drive unit 11, and the electric actuator unit 6 drives the support platform 7 to move. The displacement sensing unit 42 and the force sensing unit 43 on the support platform 7 obtain sensor information and feed back the sensor information to the controller 12.

[0057] As Figure 14 , Figure 16 shown, when the electric actuator unit 6 of the road surface excitation simulation platform simulates road surface excitation acting on the wheels 52, the force sensing unit 43 obtains corresponding sensor information, and at the same time transmits the collected sensor information to the controller 12. The controller 12 processes the sensor information and returns it to the host computer for calculation and analysis, so that relevant analysis information on the dynamic load of the wheels 52 can be obtained.

[0058] As Figure 14 , Figure 16 shown, when the electric actuator unit in the road surface excitation simulation platform simulates road surface excitation acting on the vehicle body 51, the acceleration sensing unit 41 obtains corresponding sensor information, and at the same time transmits the collected sensor information to the controller 12. The controller 12 returns the sensor information to the host computer for calculation and analysis, so as to obtain relevant analysis information on the ride comfort of the entire vehicle test bench 5 during operation.

[0059] Embodiment 3

[0060] The present application also relates to a road surface excitation simulation system, which at least includes an electric actuator unit 6, a support platform 7, an elastic support unit 8, and a support frame 9. The support frame 9 is provided with at least one three-dimensional frame capable of accommodating the electric actuator unit 6. The electric actuator unit 6 is inversely installed on the lower plate surface of the top plate body 91 formed on the axial upper end surface of the three-dimensional frame, so that the electric actuator unit 6 can extend downward along its axis, and the support platform 7 connected to the axial lower end of the electric actuator unit 6 can move up and down following the expansion and contraction of the electric actuator unit 6.

[0061] It should be noted that the above specific embodiments are exemplary. Those skilled in the art can come up with various solutions inspired by the disclosed content of the present invention, and these solutions also fall within the scope of the disclosure of the present invention and within the protection scope of the present invention. Those skilled in the art should understand that the description and drawings of the present invention are illustrative and do not constitute a limitation on the claims. The protection scope of the present invention is defined by the claims and their equivalents. Throughout the text, the features guided by "preferably" are only an optional manner and should not be understood as being necessarily provided. Therefore, the applicant reserves the right to abandon or delete relevant preferred features at any time.

Claims

1. A suspension dynamic test system, which includes a vehicle dynamic test bench (2) for testing the dynamic performance of a vehicle body and a suspension. The vehicle dynamic test bench (2) is provided with at least one road surface excitation simulation bench in a manner corresponding to the number of wheels to be supported by the vehicle. It is characterized in that, The road surface excitation simulation platform at least includes an electric actuator unit (6), a support platform (7), an elastic support unit (8), and a support frame (9), where at least one three-dimensional frame capable of accommodating the electric actuator unit (6) is built on the support frame (9), and the electric actuator unit (6) is installed in an inverted manner on the lower plate surface of the top plate body (91) formed on the axial upper end surface of the three-dimensional frame, so that the electric actuator unit (6) performs telescopic motion along its own axis in a manner that can change the support height of the support platform (7); the lower end surface of the support platform (7) is further connected to the elastic support unit (8) supported on the bottom plate body (92) of the support frame (9), and the electric actuator unit (6) can cooperate with the elastic support unit (8) so that the support platform (7) can perform undulating motion following the telescopic motion of the electric actuator unit (6).

2. The suspension dynamic test system according to claim 1, wherein The elastic support unit (8) can define the initial height of the support platform (7) when the vehicle bench (5) is placed on the vehicle dynamic test bench (2), so that the electric actuator unit (6) can drive the support platform (7) to move upward along the axis of the electric actuator unit (6) so that the support platform (7) can simulate road surface excitation conditions.

3. The suspension dynamic test system according to claim 2, wherein, Part of the bottom plate body (92) is located outside the space defined by the three-dimensional frame, and the elastic support unit (8) is supported on this part of the bottom plate body (92) so that the elastic support unit (8) can be located directly below the tires of the vehicle bench (5), and the elastic support unit (8) is connected to the outer end of the support platform (7).

4. The suspension dynamic test system according to claim 3, wherein The inner end of the support platform (7) is connected to the three-dimensional frame through a linear guide rail (3), and the linear guide rail (3) is arranged on the support column (93) of the support frame (9), so that the inner end of the support platform (7) can perform reciprocating motion on the linear guide rail (3) following the telescopic motion of the electric actuator unit (6), thereby driving the outer end of the support platform (7) to perform undulating motion.

5. The suspension dynamic test system according to claim 4, wherein A number of sensing units (4) capable of monitoring the motion parameter information of the vehicle bench (5) are also installed on the support platform (7). The sensing units (4) can collect the motion parameter information of the vehicle bench (5) when it performs undulating motion following the support platform (7), and feed back the collected motion parameter information to the control cabinet (1).

6. The suspension dynamic test system according to claim 5, wherein, A motor drive unit (11) capable of controlling at least one electric actuator unit (6) to perform undulating motion and a controller (12) capable of receiving the motion parameter information fed back by the sensing unit (4) are arranged in the control cabinet (1).

7. The suspension dynamic test system according to claim 6, wherein The sensing unit (4) at least includes an acceleration sensing unit (41), a displacement sensing unit (42) capable of monitoring the position of the vehicle test bench (5) on the support platform (7), and a force sensing unit (43). Among them, the force sensing unit (43) can obtain the supporting force of the support platform (7) when stably supporting the vehicle test bench (5) and / or driving the vehicle test bench (5) to perform undulating motion.

8. A road surface excitation simulation system, characterized in that The road surface excitation simulation system at least includes an electric actuator unit (6), a support platform (7), an elastic support unit (8), and a support frame (9). Among them, At least one three-dimensional frame capable of accommodating the electric actuator unit (6) is built on the support frame (9). The electric actuator unit (6) is installed on the lower surface of the top plate body (91) formed on the axial end face of the three-dimensional frame in an inverted manner, so that the electric actuator unit (6) performs telescopic motion along its own axis in a manner that can change the support height of the support platform (7); The lower surface of the support platform (7) is further connected with an elastic support unit (8) supported on the bottom plate body (92) of the support frame (9). The electric actuator unit (6) can cooperate with the elastic support unit (8) so that the support platform (7) can perform undulating motion following the telescopic motion of the electric actuator unit (6).

9. A suspension dynamic test device, characterized in that, It at least includes at least one test structure constructed by the road surface excitation simulation system described in claim 8. The test structure can selectively support the vehicle test bench (5) of a multi-axis vehicle, and the road surface excitation simulation bench enables the sensing unit (4) arranged on the vehicle frame (53) to monitor real-time changing motion parameter information by driving the wheels (52) of the vehicle test bench (5) to move.

10. The suspension dynamic test device according to claim 9, characterized in that, The test structure at least supports one of the wheels (52) so that the road surface excitation simulation system arranged in the test structure can be matched with the wheels (52).

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