An active shock absorber durability bench test device and test method

Abstract

The present invention discloses an active shock absorber durability bench test device and a test method. The active shock absorber durability bench test device includes a bench, a simulated road surface excitation actuator, and a control system. The test method uses the above-mentioned active shock absorber durability bench test device to conduct a durability test on the active shock absorber. The test method includes an installation step, an operation step, a post-test step, and a determination step. When in use, after installing the active shock absorber to be tested on the bench, a displacement request signal can be input to the simulated road surface excitation actuator, so that the simulated road surface excitation actuator applies a displacement excitation to the movable end, and a force value request signal is input to the active shock absorber, so that the active shock absorber applies an active force to the simulated road surface excitation actuator, that is, the active force of the active shock absorber is added in the durability test to meet the test requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of testing, and particularly relates to an active shock absorber durability bench test device and a test method. Background Art

[0002] An active shock absorber is an active electromechanical-hydraulic coupling system. This product has its own controller, can communicate with the vehicle controller, and can output active force according to the vehicle driving state to improve the vehicle handling stability and comfort. In the durability test, traditional shock absorbers can be tested by applying equal-amplitude displacement loading; however, for active shock absorbers such active components, their durability is affected not only by road surface excitation but also by the active force output. Therefore, traditional test technologies cannot meet the test requirements. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides an active shock absorber durability bench test device and a test method.

[0004] An active shock absorber durability bench test device according to an embodiment of the first aspect of the present invention includes:

[0005] A bench for installing the active shock absorber;

[0006] A simulated road surface excitation actuator connected to the movable end of the active shock absorber for applying displacement excitation to the active shock absorber;

[0007] A control system electrically connected to the active shock absorber and the simulated road surface excitation actuator for inputting a displacement request signal to the simulated road surface excitation actuator to make the simulated road surface excitation actuator apply displacement excitation to the movable end, and inputting a force value request signal to the active shock absorber to make the active shock absorber apply an active force to the simulated road surface excitation actuator; and testing the performance of the active shock absorber to obtain the post-test performance index. When the difference between the post-test performance index and the initial performance index of the active shock absorber is less than or equal to a preset value, it is determined that the active shock absorber is qualified.

[0008] The active shock absorber durability bench test device according to an embodiment of the first aspect of the present invention has at least the following technical effects: When in use, after installing the active shock absorber to be tested on the bench, a displacement request signal can be input to the simulated road surface excitation actuator to make the simulated road surface excitation actuator apply displacement excitation to the movable end, and a force value request signal can be input to the active shock absorber to make the active shock absorber apply an active force to the simulated road surface excitation actuator, that is, the active force of the active shock absorber is added in the durability test, meeting the test requirements.

[0009] According to some embodiments of the present invention, the control system includes an active suspension system module and a real-time simulation system module. The real-time simulation system module is used to establish a vehicle driving simulation model and obtain the motion state simulation data of the vehicle driving simulation model. The active suspension system module is used to generate the force value request signal according to the motion state simulation data.

[0010] According to the test method of the second aspect embodiment of the present invention, the durability test of the active shock absorber is carried out using the above-mentioned active shock absorber durability bench test device. The test method includes the following steps:

[0011] Installation step: Install the active shock absorber on the bench;

[0012] Operation step: Input a displacement request signal to the simulated road surface excitation actuator, so that the simulated road surface excitation actuator applies a displacement excitation to the movable end of the active shock absorber, and input a force value request signal to the active shock absorber, so that the active shock absorber applies an active force to the simulated road surface excitation actuator;

[0013] Post-test step: Test the performance of the active shock absorber to obtain the post-test performance index;

[0014] Determination step: When the difference between the post-test performance index and the initial performance index is less than or equal to the preset value, determine that the active shock absorber is qualified.

[0015] According to the test method of the second aspect embodiment of the present invention, it has at least the following technical effects: Input a displacement request signal to the simulated road surface excitation actuator, so that the simulated road surface excitation actuator applies a displacement excitation to the movable end, and input a force value request signal to the active shock absorber, so that the active shock absorber applies an active force to the simulated road surface excitation actuator, that is, the active force of the active shock absorber is added in the durability test to meet the test requirements.

[0016] According to some embodiments of the present invention, the test method further includes the following steps: Use an experimental vehicle to collect road spectrum information, and the road spectrum information includes the displacement spectrum of the movable end of the active shock absorber of the experimental vehicle and the force value request spectrum received by the active shock absorber of the experimental vehicle;

[0017] The operation step further includes: Set the displacement request signal to be consistent with the displacement spectrum, and set the force value request signal to be consistent with the force value request spectrum.

[0018] According to some embodiments of the present invention, the control system includes an active suspension system module, a real-time simulation system module and a simulated road surface excitation system module; the test method further includes the following steps:

[0019] Use the real-time simulation system module to establish a vehicle driving simulation model and obtain the motion state simulation data of the vehicle driving simulation model;

[0020] Use the simulated road excitation system module to generate a simulation displacement signal according to the motion state simulation data;

[0021] Use the active suspension system module to generate a simulation force value request signal according to the motion state simulation data;

[0022] The running step further includes: setting the displacement request signal to be consistent with the simulation displacement signal, and setting the force value request signal to be consistent with the simulation force value request signal.

[0023] According to some embodiments of the present invention, the test method further includes the following steps: obtaining the force value feedback signal of the active shock absorber and / or the displacement feedback signal of the active end of the active shock absorber, and correcting the vehicle driving simulation model according to the force value feedback signal and / or the displacement feedback signal.

[0024] According to some embodiments of the present invention, the test method further includes the following steps:

[0025] Monitoring step: When the operation of the active shock absorber durability bench test device is abnormal, execute the inspection step;

[0026] Inspection step: Pause the test, and terminate the test when the active shock absorber is damaged.

[0027] According to some embodiments of the present invention, the monitoring step further includes: obtaining the diagnostic information of the active shock absorber, and determining that the operation of the active shock absorber durability bench test device is abnormal when abnormal noise appears in the diagnostic information.

[0028] According to some embodiments of the present invention, the monitoring step further includes: obtaining the force value feedback signal of the active shock absorber, and determining that the operation of the active shock absorber durability bench test device is abnormal when the force value feedback signal is less than 70% of the force value request signal.

[0029] According to some embodiments of the present invention, the monitoring step further includes: obtaining the displacement feedback signal of the active end of the active shock absorber, comparing the displacement feedback signal with the displacement request signal, and if the pseudo-damage ratio of the two is not 80% - 120% or the RMS error of the two is not less than 10%, it is determined that the operation of the active shock absorber durability bench test device is abnormal.

[0030] The additional aspects and advantages of the present invention will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of embodiments in conjunction with the accompanying drawings, where:

[0032] Figure 1 is a schematic structural diagram of the active shock absorber durability bench test device according to the first embodiment of the present invention;

[0033] Figure 2 is a schematic structural diagram of the active shock absorber durability bench test device according to the second embodiment of the present invention;

[0034] Figure 3 is a flowchart of the test method according to the third embodiment of the present invention;

[0035] Figure 4 is a flowchart of the test method according to the fourth embodiment of the present invention.

[0036] Figure 5 is a flowchart of the test method according to the fifth embodiment of the present invention

[0037] In the drawings:

[0038] 100 - base; 200 - guide seat; 300 - cross beam; 400 - force sensor; 500 - active shock absorber; 600 - simulated road surface excitation actuator. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0040] In the description of the present invention, it should be understood that for the orientation description, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc., is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. In addition, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, exceeding, etc. are understood as not including the present number, and above, below, within, etc. are understood as including the present number. If there is a description of first and second, it is only for the purpose of distinguishing technical features and should not be understood as indicating relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0041] In the description of the present invention, unless otherwise clearly defined, terms such as "setting", "installation", "connection", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0042] Next, refer to Figures 1 to 5 to describe the active shock absorber durability bench test device and test method according to an embodiment of the present invention.

[0043] The active shock absorber durability bench test device according to the first aspect embodiment of the present invention:

[0044] Embodiment 1:

[0045] Refer to Figure 1 , the test device includes a bench, a simulated road surface excitation actuator 600, and a control system.

[0046] The bench is used to install the active shock absorber 500. The bench includes a base 100, a guide seat 200, and a cross beam 300. The guide seat 200 is fixedly arranged on the upper side of the base 100. The cross beam 300 is arranged on the guide seat 200. The cross beam 300 is slidably arranged vertically on the guide seat 200. The cross beam 300 is provided with a locking device. The cross beam 300 is relatively fixed to the guide seat 200 through the locking device. Then, the vertical distance between the cross beam 300 and the base 100 can be adjusted to adapt to active shock absorbers 500 of different sizes; a connecting seat is arranged at the bottom of the cross beam 300. The active shock absorber 500 is placed vertically. The upper end of the active shock absorber 500 is its fixed end. The active shock absorber 500 is fixedly installed on the connecting seat through the fixed end; the lower end of the active shock absorber 500 is its movable end. The simulated road surface excitation actuator 600 is connected between the movable end and the base 100 and is used to apply a displacement excitation to the active shock absorber 500. The simulated road surface excitation actuator 600 can be an electric push rod.

[0047] Among them, the active shock absorber durability bench test device can also be provided with a force sensor 400 and a displacement sensor. The displacement sensor is arranged beside the movable end. The displacement sensor is used to sense the displacement of the movable end relative to the base 100; the displacement sensor can be integrated in the simulated road surface excitation actuator 600, and the displacement sensor can also be an independent component; when the displacement sensor is an independent component, the displacement sensor can be fixedly installed on the base 100 through an additional connecting frame; the force sensor 400 can be arranged between the connecting seat and the fixed end. The force sensor 400 is used to sense the magnitude of the force transmitted between the fixed end and the connecting seat; both the displacement sensor and the force sensor 400 are electrically connected to the control system to transmit the displacement feedback signal obtained by the displacement sensor and the force value feedback signal obtained by the force sensor 400 to the control system.

[0048] The control system includes a power supply system module, a simulated road surface excitation system module, and a real-time simulation system module. The power supply system module can supply power to the real-time simulation system module, the simulated road surface excitation system module, and the active shock absorber 500 to ensure their normal operation. In this embodiment, the displacement request signal and the active force request signal are obtained by means of road spectrum acquisition.

[0049] The real-time simulation system module is used for simulating the networked environment required for the operation of the active shock absorber 500. It establishes communication with the active shock absorber 500 through CAN communication, sends the active shock absorber 500 force value request signal obtained by road spectrum acquisition to the active shock absorber 500, enables the active shock absorber 500 to apply an active force to the simulated road surface actuator 600, and simultaneously collects the diagnostic information of the active shock absorber 500.

[0050] The simulated road surface excitation system module is used to control the simulated road surface actuator 600 to apply a displacement excitation to the movable end of the active shock absorber 500, and directly play and apply the active shock absorber 500 displacement spectrum data (i.e., the displacement request signal) obtained by road spectrum acquisition on the active shock absorber 500 through the simulated road surface actuator 600. When playing the displacement spectrum data under various working conditions, the simulated road surface excitation system module can compare and calculate the displacement data (i.e., the displacement feedback signal) fed back by the displacement sensor with the pseudo-damage value and RMS error of the displacement spectrum data, and compare and calculate the force value feedback signal obtained by the force sensor 400 with the force value request signal sent by the real-time simulation system module for monitoring steps. Among them, the number of simulated road surface actuators 600 can be multiple. Multiple simulated road surface actuators 600 can simultaneously conduct tests on multiple active shock absorbers 500. Multiple simulated road surface actuators 600 can be controlled by the same simulated road surface excitation system module, and each active shock absorber 500 can be controlled by an independent real-time simulation system module respectively.

[0051] The real-time simulation system module and the simulated road surface excitation system module can establish a connection through communication technologies such as EtherCAT (Ethernet Control Automation Technology) and reflective memory cards to achieve information interaction and time synchronization between the two system modules. They can also integrate the real-time simulation system module and the simulated road surface excitation control system module in the same controller and establish a connection through software. The control system can synchronously play the displacement request signal and the force value request signal, send the force value request signal in the real-time simulation system module and the diagnostic signal fed back by the active shock absorber 500 to the simulated road surface excitation system module, and simultaneously send the operating state of the road surface actuator to the real-time simulation system module.

[0052] When conducting the durability bench test on the active shock absorber 500, by inputting a force value request signal to the active shock absorber 500, the active shock absorber 500 can apply an active force to the simulated road surface excitation actuator 600, that is, the active force of the active shock absorber 500 is added in the durability test, meeting the test requirements.

[0053] Embodiment 2:

[0054] Referring to Figure 2 , on the basis of Embodiment 1, the control system further includes an active suspension system module. The real-time simulation system module is used to establish a vehicle driving simulation model and obtain the motion state simulation data of the vehicle driving simulation model. The active suspension system module is used to generate a force value request signal according to the motion state simulation data. The active suspension system module can be arranged in an independent active suspension controller hardware, and the active suspension controller hardware is connected between the real-time simulation system module of the control system and the active shock absorber 500, which is consistent with the actual vehicle operation situation, making the operation of the active shock absorber 500 in the active shock absorber durability bench test device closer to the operation of the active shock absorber 500 in the actual situation.

[0055] In this embodiment, the displacement request signal and the active force request signal are obtained through virtual simulation.

[0056] The real-time simulation system module is used for the simulation of the network environment required for the vehicle to work and the operation of the vehicle driving simulation model. The real-time simulation system module establishes a vehicle driving simulation model through dynamic simulation software and obtains the motion state simulation data of the vehicle driving simulation model. The vehicle driving simulation model includes a vehicle dynamics model, driving behavior, road surface and other scenario models. The vehicle driving simulation model conducts a virtual vehicle road simulation test in the real-time simulation system module according to the requirements of the real vehicle durability test specification.

[0057] The active suspension system module and the real-time simulation system module can conduct information interaction. The real-time simulation system module establishes communication with the vehicle driving simulation model through communication such as CAN and PSI5, so that the motion state simulation data of the vehicle driving simulation model can be sent to the active suspension system module; the active suspension system module can generate a force value request signal according to the motion state simulation data and input a force value request signal to the active shock absorber, so that the active shock absorber applies an active force to the simulated road surface excitation actuator. The active suspension system module can also send the diagnostic signal feedback by the active shock absorber 500 to the real-time simulation system module.

[0058] The simulated road excitation system module and the real-time simulation system module can conduct information interaction. On the one hand, the simulated road excitation system module generates a displacement request signal according to the motion state simulation data, and inputs the displacement request signal to the simulated road excitation actuator, so that the simulated road excitation actuator applies a displacement excitation to the movable end. On the other hand, the simulated road excitation system module sends the force value feedback signal obtained by the force sensor 400 and the displacement feedback signal obtained by the displacement sensor to the real-time simulation system module. The real-time simulation system corrects the vehicle driving simulation model according to the force value feedback signal and the displacement feedback signal to ensure that the operation steps are synchronized and closed-loop with the operation of the vehicle driving simulation model.

[0059] The test method of the second aspect embodiment of the present invention:

[0060] Embodiment 3:

[0061] Refer to Figure 1 and Figure 3 , use the above-mentioned active shock absorber durability bench test device to conduct the durability test of the active shock absorber 500. The test method includes an installation step, a front side step, an operation step, a rear side step, and a determination step.

[0062] Installation step: Install the active shock absorber 500 on the bench, make the fixed end of the active shock absorber 500 relatively fixed to the bench, and connect the movable end of the active shock absorber 500 to the simulated road excitation actuator 600, then the simulated road excitation actuator 600 can apply a displacement excitation to the movable end of the active shock absorber 500.

[0063] Pre-test step: Test the performance of the active shock absorber 500 to obtain the initial performance indicators; the way to test the performance of the active shock absorber 500 can be: the real-time simulation system module does not send a force value request signal to the active shock absorber 500, and the simulated road excitation system module sends an excitation signal to the simulated road excitation actuator 600, so that the movable end of the active shock absorber 500 operates at a set amplitude and speed, and the force sensor 400 measures the damping force of the active shock absorber 500 at the set amplitude and speed, and this damping force is one of the initial performance indicators; among them, the movable end of the active shock absorber 500 can operate at multiple amplitudes and speeds to measure multiple initial performance indicators. In addition, the initial performance indicators of the active shock absorber 500 can be obtained through other experimental devices before the installation step in addition to being obtained through the active shock absorber durability bench test device.

[0064] Operation steps: Input a displacement request signal to the simulated road surface actuator 600, so that the simulated road surface actuator 600 applies a displacement excitation to the movable end of the active shock absorber 500, and input a force value request signal to the active shock absorber 500, so that the active shock absorber 500 applies an active force to the simulated road surface actuator 600; both the displacement request signal and the force value request signal are continuous signals for a period of time, so that the simulated road surface actuator 600 applies a continuously changing displacement excitation to the movable end, and the active shock absorber 500 applies a continuously changing active force to the simulated road surface actuator 600. During the test, air-cool the active shock absorber 500 to better simulate the actual vehicle operation condition.

[0065] Among them, the displacement request signal can be a pulse signal, a sine signal or other conventional analog signals, and the force value request signal can also be a pulse signal, a sine signal or other conventional analog signals; of course, in order to make the durability test of the active shock absorber 500 more reliable, the displacement request signal and the force value request signal can be obtained through road spectrum acquisition.

[0066] The method of obtaining the displacement request signal and the force value request signal through road spectrum acquisition is as follows: Use an experimental vehicle to collect road spectrum information, and the road spectrum information includes the displacement spectrum of the movable end of the active shock absorber of the experimental vehicle and the force value request spectrum received by the active shock absorber of the experimental vehicle; in the operation steps, set the displacement request signal to be consistent with the displacement spectrum, and set the force value request signal to be consistent with the force value request spectrum. When using an experimental vehicle to collect road spectrum information, according to the vehicle durability test specification, synchronously collect the displacement spectra of the 4 active shock absorbers of the experimental vehicle (that is, the displacement of the movable end of the active shock absorber relative to the fixed end of the active shock absorber) and the force value request spectrum transmitted by the vehicle to the active shock absorber through CAN; when only one set of data is needed, the data with the largest damage in the displacement spectrum and the force value request spectrum can be selected from the four sets of road spectrum data collected as the displacement request signal and the force value request signal in the operation steps; obtaining the displacement request signal and the force value request signal through the method of road spectrum acquisition, the signals are closer to the actual operation condition, which is beneficial to making the durability test of the active shock absorber 500 more accurate and reliable.

[0067] Post-test steps: Test the performance of the active shock absorber 500 to obtain the performance indicators after the test; the method of testing the performance of the active shock absorber 500 can be: the real-time simulation system module does not send a force value request signal to the active shock absorber 500, and the simulated road surface excitation system module sends an excitation signal to the simulated road surface actuator 600, so that the movable end of the active shock absorber 500 runs at the set amplitude and speed, and the force sensor 400 measures the damping force of the active shock absorber 500 at the set amplitude and speed, and this damping force is one of the performance indicators after the test; among them, the movable end of the active shock absorber 500 can be made to run at multiple amplitudes and speeds to measure multiple initial performance indicators.

[0068] Determination steps: Compare the initial performance indicators with the performance indicators after the test. When the difference between the performance indicators after the test and the initial performance indicators is less than or equal to the preset value, it is determined that the active shock absorber 500 is qualified. If the difference between each performance indicator after the test of the active shock absorber 500 and each initial performance indicator does not exceed 30%, it is considered qualified; otherwise, it is unqualified. Of course, for some active shock absorbers 500 with higher requirements, the difference may also be set not to exceed 20% as the qualification standard.

[0069] By inputting a force value request signal to the active shock absorber 500, the active shock absorber 500 applies an active force to the simulated road surface excitation actuator 600 during the durability test, that is, the active force of the active shock absorber 500 is added during the durability test, meeting the test requirements. The state of the active shock absorber 500 in the vehicle road test is reproduced to the greatest extent. The vehicle operating conditions are quickly reproduced through the test bench to quickly and accurately verify the reliability of the product. By assessing the reliability of the active shock absorber 500 through the test bench in the early stage of product development, the probability of quality problems in the later stage can be reduced, the product development cycle can be shortened, the development cost can be saved. At the same time, it is also beneficial to quickly evaluate the improvement effect of product quality.

[0070] Embodiment 4:

[0071] Referring to Figure 2 and Figure 4 , on the basis of the above Embodiment 3, obtaining the displacement request signal and the force value request signal through road spectrum acquisition is changed to obtaining the displacement request signal and the force value request signal through virtual simulation.

[0072] The method for obtaining the displacement request signal and the force value request signal through virtual simulation is as follows: Use simulation software to establish a vehicle driving simulation model, obtain the motion state simulation data from the vehicle driving simulation model, send the motion state simulation data to the active suspension system module and the simulated road surface excitation system module. Use the simulated road surface excitation system module to generate a simulated displacement signal according to the motion state simulation data, and use the active suspension system module to generate a simulated force value request signal according to the motion state simulation data; in the operation step, set the displacement request signal to be consistent with the simulated displacement signal, and set the force value request signal to be consistent with the simulated force value request signal. When using simulation software to establish a vehicle driving simulation model, establish a vehicle dynamics model, driving behavior and road surface and other scene models through dynamic simulation software, and conduct a vehicle road virtual simulation test according to the requirements of the real vehicle durability test specification, that is, complete the establishment of the vehicle driving simulation model, and then obtain the displacement and force value request signals of the 4 active shock absorbers in the simulation model, and select one for the durability test of one active shock absorber or conduct the durability test of 4 active shock absorbers at the same time; the simulation software can be installed in the real-time simulation system module.

[0073] Among them, the test method further includes: obtaining the force value feedback signal of the active shock absorber 500 and / or the displacement feedback signal of the movable end of the active shock absorber 500, feeding the force value feedback signal and / or the displacement feedback signal back to the vehicle driving simulation model, and correcting the vehicle driving simulation model according to the force value feedback signal and / or the displacement feedback signal, so that the operation steps are synchronized and closed-loop with the operation of the vehicle driving simulation model, making the vehicle driving simulation model more accurate. The test method is not limited to the active shock absorber and is also applicable to shock absorbers with continuously adjustable damping force.

[0074] Obtaining the displacement request signal and the force value request signal through virtual simulation is convenient for switching various scenarios such as urban roads, highway roads, and off-road roads, and there is no need to collect road spectra of corresponding scenarios through real vehicles, which is relatively simple.

[0075] Embodiment Five:

[0076] Refer to Figure 5 , on the basis of the above Embodiment Three or Embodiment Four, the test method further includes a monitoring step and an inspection step.

[0077] Monitoring step: Monitor and judge whether there is any abnormality in the operation of the active shock absorber durability bench test device. If there is an abnormality in the operation of the active shock absorber durability bench test device, execute the inspection step. If there is no abnormality in the operation of the active shock absorber durability bench test device, continue the test;

[0078] Among them, the method for monitoring and judging whether there is any abnormality in the operation of the active shock absorber durability bench test device can be: obtaining the diagnostic information of the active shock absorber 500. If there is an abnormal noise in the diagnostic information, it is determined that there is an abnormality in the operation of the active shock absorber durability bench test device. Whether it is abnormal can be judged according to the diagnostic information fed back by the active shock absorber 500 itself.

[0079] The method for monitoring and judging whether there is any abnormality in the operation of the active shock absorber durability bench test device can also be: obtaining the force value feedback signal of the active shock absorber 500. If the force value feedback signal is less than 70% of the force value request signal, it is determined that there is an abnormality in the operation of the active shock absorber durability bench test device. If the force value feedback signal is greater than or equal to 70% of the force value request signal, it is determined that there is no abnormality in the operation of the active shock absorber durability bench test device. The force value feedback signal is obtained by the force sensor 400 of the active shock absorber durability bench test device; ideally, the force value feedback signal should be equal to the force value request signal, and if the force value feedback signal is too small, it can be judged that there is an abnormality.

[0080] The method for monitoring and judging whether there is any abnormality in the operation of the bench test device for the durability of the active shock absorber can also be: obtaining the displacement feedback signal of the moving end, comparing the displacement feedback signal with the displacement request signal. If the pseudo-damage ratio of the two is 80% - 120% and the RMS error between the two is less than 10%, it is determined that the operation of the bench test device for the durability of the active shock absorber is normal; if the pseudo-damage ratio of the two is not 80% - 120% or the RMS error between the two is not less than 10%, that is, the pseudo-damage ratio of the two is less than 80% or greater than 120% or the RMS error between the two is greater than or equal to 10%, it is determined that the operation of the bench test device for the durability of the active shock absorber is abnormal. Ideally, the pseudo-damage ratio is 100% and the RMS error is 0%. Excessive deviation of the pseudo-damage ratio from 100% or too large RMS error can both be judged as abnormal. The pseudo-damage ratio and the RMS error can also be used to judge whether there is any abnormality.

[0081] Inspection steps: Pause the test and check whether the active shock absorber 500 is damaged. If the active shock absorber 500 is not damaged, continue the test. If the active shock absorber 500 is damaged, terminate the test and determine that the active shock absorber 500 is unqualified. Among them, the method for checking whether the active shock absorber 500 is damaged is: checking whether there are phenomena such as oil leakage, jamming, appearance damage, deformation, etc. in the active shock absorber 500. If there is any of the above phenomena, it is determined that the active shock absorber 500 is damaged.

[0082] Real-time monitor and judge whether there is any abnormality in the operation of the test device. If there is no abnormality, continue to run; if there is an abnormality, troubleshoot the problem. This can timely detect faults or unexpected situations, which is beneficial to improving the safety and accuracy of the test.

[0083] The above has specifically described the preferred embodiments of the present invention, but the present invention is not limited to the embodiments. Those skilled in the art can also make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. An active shock absorber durability bench test device, characterized in that: include: The stand is used to install the active shock absorber; the stand includes a base, a guide seat fixed on the upper side of the base, and a crossbeam arranged on the guide seat, and a connecting seat is arranged at the bottom of the crossbeam; A simulated road excitation actuator connected to the active end of the active shock absorber and used to apply displacement excitation to the active shock absorber; A force sensor, used to sense the force transmitted between the fixed end and the connecting seat of the active shock absorber; A displacement sensor, used to sense the displacement of the movable end relative to the base; A control system, electrically connected to the active shock absorber and the simulated road surface excitation actuator, for inputting a displacement request signal to the simulated road surface excitation actuator so that the simulated road surface excitation actuator applies a displacement excitation to the active end, and for inputting a force value request signal to the active shock absorber so that the active shock absorber applies an active force to the simulated road surface excitation actuator; and for testing the performance of the active shock absorber to obtain a post-test performance index, and when the difference between the post-test performance index and the initial performance index of the active shock absorber is less than or equal to a preset value, the active shock absorber is judged to be qualified; The control system includes a simulated road excitation system module, an active suspension system module and a real-time simulation system module. The real-time simulation system module is connected to the simulated road excitation system module via a reflective memory card. The simulated road excitation system module is used to generate a displacement request signal according to motion state simulation data, and send a force feedback signal obtained by a force sensor and a displacement feedback signal obtained by a displacement sensor to the real-time simulation system module. The real-time simulation system module is used to establish a vehicle driving simulation model, obtain motion state simulation data of the vehicle driving simulation model, and correct the vehicle driving simulation model according to the force feedback signal and the displacement feedback signal. The active suspension system module is used to generate the force request signal according to the motion state simulation data.

2. A test method, characterized in that: The durability test of the active vibration absorber is carried out using the active vibration absorber durability bench test device as claimed in claim 1, and the test method comprises the following steps: Installation step: installing the active vibration absorber on the stand; Operation steps: inputting a displacement request signal to the simulated road surface excitation actuator so that the simulated road surface excitation actuator applies displacement excitation to the active end of the active shock absorber, and inputting a force value request signal to the active shock absorber so that the active shock absorber applies active force to the simulated road surface excitation actuator; Post-test step: testing the performance of the active shock absorber to obtain post-test performance indicators; Determination step: when the difference between the post-test performance index and the initial performance index is less than or equal to a preset value, the active shock absorber is determined to be qualified.

3. The test method according to claim 2, characterized in that: The control system includes an active suspension system module, a real-time simulation system module and a simulated road surface excitation system module; the test method also includes the following steps: Using the real-time simulation system module to establish a vehicle driving simulation model, and obtaining motion state simulation data of the vehicle driving simulation model; Using the simulated road surface excitation system module to generate a simulated displacement signal according to the motion state simulation data; Using the active suspension system module to generate a simulation force value request signal according to the motion state simulation data; The operation step further includes: setting the displacement request signal to be consistent with the simulation displacement signal, and setting the force value request signal to be consistent with the simulation force value request signal.

4. The test method according to claim 3, characterized in that: The test method also includes the following steps: obtaining a force feedback signal of the active shock absorber and / or a displacement feedback signal of the active end of the active shock absorber, and correcting the vehicle driving simulation model according to the force feedback signal and / or the displacement feedback signal.

5. The test method according to claim 2, characterized in that: The test method also includes the following steps: Monitoring step: when the active shock absorber durability bench test device operates abnormally, performing an inspection step; Inspection steps: Pause the test; when the active shock absorber is damaged, terminate the test.

6. The test method according to claim 5, characterized in that: The monitoring step further includes: obtaining diagnostic information of the active shock absorber, and when an abnormal sound appears in the diagnostic information, determining that the operation of the active shock absorber durability bench test device is abnormal.

7. The test method according to claim 5, characterized in that: The monitoring step further includes: obtaining a force feedback signal of the active shock absorber, and determining that the operation of the active shock absorber durability bench test device is abnormal when the force feedback signal is less than 70% of the force request signal.

8. The test method according to claim 5, characterized in that: The monitoring step also includes: obtaining a displacement feedback signal of the active end of the active shock absorber, comparing the displacement feedback signal with the displacement request signal, and if the pseudo-damage ratio of the two is not 80% to 120% or the RMS error of the two is not less than 10%, it is determined that the operation of the active shock absorber durability bench test device is abnormal.

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