Performance detection device for automobile shock absorber

Abstract

The invention belongs to the technical field of vehicle suspension detection equipment, and particularly relates to an automobile shock absorber performance detection device, which comprises a base, a mounting frame, a positioning pin, a positioning stud and a positioning bolt, and is characterized in that the mounting frame is fixedly connected to the base, and the positioning pin can adjust the vertical distance and is used for being inserted into a ring part at the top end of a shock absorber; the positioning stud is used for being inserted into a ring part at the bottom end of the shock absorber and locked through a positioning bolt, the positioning stud is connected with an executing mechanism, the executing mechanism pulls or extrudes the lower end of the shock absorber through the positioning stud, and the control system is used for monitoring displacement and force changes of the shock absorber in real time through an integrated sensor and a control module. And test parameters are dynamically adjusted based on data analysis. According to the invention, the execution mechanism pulls or extrudes the lower end of the shock absorber, and the control system collects the displacement data and the stress data of the shock absorber in real time through the integrated sensor, and dynamically adjusts the test parameters based on the data analysis, thereby completing the performance detection of the shock absorber.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle suspension detection equipment, and particularly relates to a performance detection device for automobile shock absorber. BACKGROUND

[0002] The shock absorber is a key part in the process of automobile driving, and its performance directly affects the driving stability, comfort and safety of the vehicle, so the performance detection of the shock absorber is an important link in the process of automobile production and maintenance. In the prior art, the device for detecting the performance of the shock absorber usually needs to fix the shock absorber through a positioning structure, and then apply a force to the shock absorber through an actuating mechanism, so as to detect the mechanical performance and displacement change of the shock absorber.

[0003] However, in the detection process of the existing device, it is difficult to monitor the force and displacement change of the shock absorber in real time, and the test parameters cannot be dynamically adjusted according to the detection data, so that the detection process has staticity and hysteresis, and therefore corresponding improvements are made for the problem. SUMMARY

[0004] Based on the technical problems existing in the prior art, the present application provides a performance detection device for automobile shock absorber.

[0005] The performance detection device for automobile shock absorber provided by the present application comprises a base, a mounting frame, a positioning pin, a positioning stud and a positioning bolt, the mounting frame is fixedly connected to the base, the positioning pin can adjust the vertical distance on the mounting frame and is used for being inserted into the ring part at the top end of the shock absorber, the positioning stud is used for being inserted into the ring part at the bottom end of the shock absorber and is locked through the positioning bolt, the positioning stud is connected with an actuating mechanism, the actuating mechanism pulls or extrudes the lower end of the shock absorber through the positioning stud, and the device further comprises a control system, which monitors the displacement and force change of the shock absorber in real time through integrated sensors and a control module, and dynamically adjusts the test parameters based on data analysis; the positioning pin is adjusted to a suitable vertical height through a rotating adjusting structure, the ring part at the top end of the shock absorber is sleeved into the positioning pin, the ring part at the bottom end of the shock absorber is sleeved into the positioning stud and is locked and fixed through the positioning bolt, the actuating mechanism is started, the lower end of the shock absorber is pulled or extruded through the positioning stud, the displacement data and the force data of the shock absorber are collected in real time by the integrated sensors of the control system, the data are analyzed and processed by the control module, corresponding coefficients are generated, the working parameters of the actuating mechanism are dynamically adjusted after comparison with the preset reference threshold, and the performance detection of the shock absorber is completed.

[0006] Preferably, the actuating mechanism comprises an electric push rod, the electric push rod is fixedly connected to the base, and the positioning stud is mounted on the output shaft of the electric push rod; the electric push rod is fixedly connected to the base, the positioning stud is mounted on the output shaft of the electric push rod, the installation and fixation of the shock absorber are completed, the electric push rod is started, the output shaft of the electric push rod drives the positioning stud to make linear reciprocating motion, and then the lower end of the shock absorber is pulled or extruded, so that the dynamic detection of the performance of the shock absorber is realized in cooperation with the control system.

[0007] Preferably, the actuator comprises a motor and a rotating disc, the motor is fixedly connected to the base, the rotating disc is installed on the output shaft of the motor, and the positioning stud is installed at the edge of the rotating disc; the positioning stud is installed at the edge of the rotating disc, after the shock absorber is installed and fixed, the motor is started, the motor drives the rotating disc to rotate, and the positioning stud at the edge of the rotating disc moves in a circular motion, thereby generating a multi-directional pulling or extruding force on the lower end of the shock absorber, so that the stress during detection is closer to the stress condition in the real environment; the control system monitors and analyzes the displacement and force change of the shock absorber in real time, dynamically adjusts the rotating speed and other parameters of the motor, and completes the detection.

[0008] Preferably, a sliding opening is formed in the mounting frame, a sliding block is slidably connected in the sliding opening, an adjusting screw is rotatably connected in the sliding opening and threadedly connected with the sliding block, and a positioning pin is installed at the end of the sliding block; when the vertical distance of the positioning pin needs to be adjusted, the adjusting screw is rotated, the sliding block slides up and down along the sliding opening under the action of threaded transmission, the positioning pin is synchronously adjusted in height, after being adjusted to a suitable position, the adjusting screw is stopped, and subsequent installation and performance detection operations of the shock absorber can be performed.

[0009] Preferably, the control system comprises:

[0010] a force collecting module installed at the connection between the upper end of the shock absorber and the positioning pin and the connection between the lower end of the shock absorber and the positioning stud, for measuring the force acting on the shock absorber in real time and generating a force fluctuation coefficient through the control module; and a displacement collecting module installed on the piston rod of the shock absorber, for measuring the displacement change of the shock absorber in real time and generating a displacement change coefficient through the control module; the force collecting module is installed at both ends of the shock absorber, i.e., the connection between the upper end of the shock absorber and the positioning pin and the connection between the lower end of the shock absorber and the positioning stud, the displacement collecting module is installed on the piston rod of the shock absorber, after the detection device is started, the force collecting module measures the force acting on the shock absorber in real time and transmits it to the control module, the control module processes the data to generate the force fluctuation coefficient; the displacement collecting module measures the displacement change of the piston rod of the shock absorber in real time and transmits it to the control module to generate the displacement change coefficient; the control module comprehensively analyzes the force fluctuation coefficient and the displacement change coefficient to generate an evaluation coefficient, compares the evaluation coefficient with a pre-set reference threshold value, and changes the test parameters according to the comparison result to ensure the accuracy of the detection process.

[0011] Preferably, the output end and the input end of the force collecting module and the output end and the input end of the displacement collecting module are electrically connected with the input end and the output end of the control module, respectively, and the output end of the control module is electrically connected with the input end of the actuator.

[0012] Preferably, the execution steps of the control module for controlling the working state of the actuator according to the comparison result are as follows:

[0013] The force collecting module collects the force borne by the shock absorber; the displacement collecting module collects the displacement change of the shock absorber; the control module calculates the force fluctuation coefficient, the displacement change coefficient and the evaluation coefficient Rpg; if Rpg < R threshold: maintaining the current test parameters; if Rpg >= R threshold: increasing the output force of the actuator, prolonging the test time or reducing the movement frequency.

[0014] Preferably, the generation logic of the force fluctuation coefficient is:

[0015] The actual force values of the shock absorber at different times within T time are obtained by the force collecting module; and the force fluctuation coefficient reflecting the force value fluctuation is calculated based on the fluctuation degree of the actual force values and the average force values.

[0016] Preferably, the generation logic of the displacement change coefficient is:

[0017] The actual displacement values of the shock absorber at different times within T time are obtained by the displacement collecting module; and the displacement change coefficient reflecting the displacement change is calculated based on the fluctuation degree of the actual displacement values and the average displacement values.

[0018] Preferably, the generation logic of the evaluation coefficient is:

[0019] The control module dynamically weighs and calculates according to the displacement change coefficient and the force fluctuation coefficient, and combines the preset weight coefficient to generate the comprehensive evaluation coefficient for evaluating the performance of the shock absorber.

[0020] Compared with the prior art, the present application provides a kind of automobile shock absorber performance detection device, with the following beneficial effects:

[0021] 1, test parameter dynamic adaptation: based on the comparison result of evaluation coefficient and reference threshold, the control module can dynamically adjust the working parameters of the actuator, solve the problem that the traditional detection device parameter is fixed and cannot adapt to the real-time performance change of shock absorber, improve the pertinence and comprehensiveness of detection.

[0022] 2, real-time and reliable detection data: the force value and displacement change data of the shock absorber are collected in real time by the force collecting module and the displacement collecting module, and the force fluctuation coefficient, the displacement change coefficient and the evaluation coefficient can be quickly generated by combining the data analysis capability of the control module, to realize the real-time feedback of detection data.

[0023] 3, accurate and convenient positioning adjustment: the vertical height of the positioning pin can be accurately adjusted by adjusting the cooperation of the lead screw and the sliding block, and the shock absorber of different specifications can be adapted to ensure that the stress direction of the shock absorber is accurate after installation, and the detection data is affected by the positioning deviation.

[0024] 4, The test result is in line with the actual situation: the actuator can apply force to the shock absorber in line with the real working scene, and the dynamic parameter is adjusted, so that the test result can better reflect the performance of the shock absorber in actual use, and provide a scientific basis for the quality evaluation of the shock absorber. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 A first angle structure schematic diagram of a shock absorber performance detection device for the embodiment 1 of the present application is provided.

[0026] Figure 2 A second angle structure schematic diagram of a shock absorber performance detection device for the embodiment 1 of the present application is provided.

[0027] Figure 3 A whole structure schematic diagram of a shock absorber performance detection device for the embodiment 2 of the present application is provided.

[0028] Figure 4 An enlarged structure schematic diagram of A of the present application is provided. Figure 2

[0029] Figure 5 A system block diagram of a shock absorber performance detection device provided by the present application is provided.

[0030] In the figure: 1, base; 2, mounting frame; 3, positioning pin; 4, shock absorber; 5, positioning stud; 6, positioning bolt; 7, electric push rod; 8, motor; 9, turntable; 10, sliding port; 11, adjusting screw; 12, sliding block. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all.

[0032] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation of the present application.

[0033] Referring to Figures 1-5 ​The utility model provides an automobile shock absorber performance detection device, including base 1, mounting bracket 2, positioning pin 3, positioning stud 5 and positioning bolt 6, mounting bracket 2 is fixedly connected on base 1, positioning pin 3 can adjust vertical distance on mounting bracket 2, and is used for inserting the ring part of shock absorber 4 top, positioning stud 5 is used for inserting the ring part of shock absorber 4 bottom, and is locked through positioning bolt 6, positioning stud 5 is connected with actuating mechanism, and actuating mechanism is pulled or extruded the lower end of shock absorber 4 through positioning stud 5, still include control system, through integrated sensor and control module, the displacement and force change of shock absorber 4 are monitored in real time, and dynamic adjustment test parameter is based on data analysis,

[0034] When using, adjust the positioning pin 3 to the appropriate vertical height by rotating the adjusting structure, put the top ring of the shock absorber 4 into the positioning pin 3, and put the bottom ring into the positioning stud 5 and lock it by the positioning bolt 6, start the actuating mechanism, pull or extrude the lower end of the shock absorber 4 through the positioning stud 5, the control system collects the displacement data and force data of the shock absorber 4 in real time through the integrated sensor, the control module analyzes and processes the data and generates the corresponding coefficient, compares it with the preset reference threshold, and dynamically adjusts the working parameters of the actuating mechanism, to complete the performance detection of the shock absorber 4.

[0035] In the embodiment 1 of the utility model, the actuating mechanism includes an electric push rod 7, the electric push rod 7 is fixedly connected to the base 1, and the positioning stud 5 is installed on the output shaft of the electric push rod 7;

[0036] When using, fix the electric push rod 7 to the base 1, install the positioning stud 5 on the output shaft of the electric push rod 7, after completing the installation and fixation of the shock absorber 4, start the electric push rod 7, the output shaft of the electric push rod 7 drives the positioning stud 5 to do linear reciprocating motion, and then pull or extrude the lower end of the shock absorber 4, and cooperate with the control system to realize the dynamic detection of the performance of the shock absorber 4.

[0037] In the embodiment 2 of the utility model, the actuating mechanism includes a motor 8 and a rotating disc 9, the motor 8 is fixedly connected to the base 1, the rotating disc 9 is installed on the output shaft of the motor 8, and the positioning stud 5 is installed at the edge position of the rotating disc 9;

[0038] When using, install the positioning stud 5 at the edge position of the rotating disc 9, after completing the installation and fixation of the shock absorber 4, start the motor 8, the motor 8 drives the rotating disc 9 to rotate, the positioning stud 5 at the edge of the rotating disc 9 does circular motion, and the difference from the embodiment 1 is that the embodiment 2 generates multi-directional pulling or extruding force on the lower end of the shock absorber 4, so that the force during detection is closer to the force situation in the real environment, the control system monitors and analyzes the displacement and force change of the shock absorber 4 in real time, dynamically adjusts the rotating speed and other parameters of the motor 8, and completes the detection.

[0039] In the application, the mounting frame 2 is provided with a sliding opening 10, a sliding block 12 is slidably connected in the sliding opening 10, an adjusting screw rod 11 is rotatably connected in the sliding opening 10 and is threadedly connected with the sliding block 12, and a positioning pin 3 is installed at the end of the sliding block 12.

[0040] When the vertical distance of the positioning pin 3 needs to be adjusted during use, the adjusting screw rod 11 is rotated, the sliding block 12 slides up and down along the sliding opening 10 under the action of threaded transmission, the positioning pin 3 is synchronously adjusted in height, and after being adjusted to the appropriate position, the adjusting screw rod 11 is stopped, and then the subsequent installation and performance detection of the shock absorber 4 can be carried out.

[0041] In the application, the control system comprises:

[0042] A force collecting module is installed at the connection between the upper end of the shock absorber 4 and the positioning pin 3 and the connection between the lower end of the shock absorber 4 and the positioning stud 5, is used for measuring the force borne by the shock absorber 4 in real time, and generates a force fluctuation coefficient through the control module;

[0043] A displacement collecting module is installed on the piston rod of the shock absorber 4, is used for measuring the displacement change of the shock absorber 4 in real time, and generates a displacement change coefficient through the control module;

[0044] The force fluctuation coefficient and the displacement change coefficient generated are comprehensively analyzed by the control module to generate an evaluation coefficient, the evaluation coefficient is compared with a reference threshold value set in advance, and the working state of the execution mechanism is controlled according to the comparison result;

[0045] It should be noted that the force collecting module can be a strain gauge type force sensor or other equipment capable of monitoring the force borne by the shock absorber 4 in real time, the displacement collecting module can be a linear variable differential transformer (LVDT) or other equipment capable of monitoring the displacement change of the shock absorber 4 in real time, and the control module is an embedded controller, such as an STM32 series, which integrates a data fusion algorithm, so the force collecting module, the displacement collecting module and the control module are not specifically limited here and can be selected according to actual needs;

[0046] During use, the force collecting module is installed at the connection between the upper end of the shock absorber 4 and the positioning pin 3 and the connection between the lower end of the shock absorber 4 and the positioning stud 5, the displacement collecting module is installed on the piston rod of the shock absorber 4, after the detection device is started, the force collecting module measures the force borne by the shock absorber 4 in real time and transmits the force to the control module, the control module processes the data to generate a force fluctuation coefficient, the displacement collecting module measures the displacement change of the piston rod of the shock absorber 4 in real time and transmits the displacement change to the control module to generate a displacement change coefficient, the control module comprehensively analyzes the force fluctuation coefficient and the displacement change coefficient to generate an evaluation coefficient, the evaluation coefficient is compared with a reference threshold value set in advance, and test parameters are changed according to the comparison result to ensure the accuracy of the detection process.

[0047] In the application, the output end and the input end of the force collecting module, the output end and the input end of the displacement collecting module are electrically connected with the input end and the output end of the control module respectively, and the output end of the control module is electrically connected with the input end of the executing mechanism.

[0048] In the application, the force fluctuation coefficient and the displacement change coefficient generated are comprehensively analyzed by the control module to generate an evaluation coefficient, the evaluation coefficient is compared with a preset reference threshold, and the execution step of controlling the working state of the executing mechanism according to the comparison result is as follows:

[0049] Real-time detection: the force collecting module collects the force borne by the shock absorber 4; the displacement collecting module collects the displacement change of the shock absorber 4;

[0050] Coefficient calculation:

[0051] Force fluctuation coefficient Fσ: the force fluctuation coefficient quantifies the force fluctuation of the shock absorber 4 in the movement process, and reveals the load abnormality caused by internal resistance or leakage. In the application, the generation logic of the force fluctuation coefficient is as follows:

[0052] S1, the actual force value of the shock absorber 4 at different times within T time is obtained by the force collecting module, and the actual force value obtained at the nth moment within T time is marked as F(n), n=1, 2, 3, …, k, n is a positive integer;

[0053] S2, the force fluctuation coefficient is calculated, and the expression for calculation is as follows:

[0054]

[0055] In the formula, is the average force value within T time; k is the sampling number within T time.

[0056] Displacement change coefficient DΔ: the displacement change coefficient represents the displacement stability of the shock absorber 4 in the compression and rebound process, and reflects the smoothness and internal wear of the shock absorber 4. In the application, the generation logic of the displacement change coefficient is as follows:

[0057] S1, the actual displacement value of the shock absorber 4 at different times within T time is obtained by the displacement collecting module, and the actual displacement obtained at the mth moment within T time is marked as D(m), m=1, 2, 3, …, t, m is a positive integer;

[0058] S2, the displacement change coefficient is calculated, and the expression for calculation is as follows:

[0059]

[0060] In the formula, is the average displacement within T time; t is the sampling number within T time.​​

[0061] Evaluation coefficient Rpg: The evaluation coefficient is a risk rating that comprehensively evaluates displacement stability and force fluctuation, and is formulaically analyzed by the control module according to the formula:

[0062]

[0063] In the formula, w1 and w2 are preset weight coefficients of displacement and force (determined dynamically in combination with experimental data and process requirements, and the optimal w1 and w2 are finally determined through an iterative process of initial theoretical assignment, field operation test, observation of effects, and fine-tuning of parameters, which is a standard practice for industrial automation system debugging, and thus is not described in detail.), and w1 and w2>1.

[0064] Dynamic adjustment: If Rpg

[0065] Working principle:

[0066] Rotate the adjusting screw rod 11 to drive the sliding block 12 to slide along the sliding groove 10, so that the positioning pin 3 is adjusted to the vertical height suitable for the shock absorber 4; the top end ring of the shock absorber 4 is sleeved into the positioning pin 3, and the bottom end ring is sleeved into the positioning stud 5, and is locked and fixed by the positioning bolt 6; the actuator is started, and the lower end of the shock absorber 4 is pulled or pressed by the positioning stud 5; the force acquisition module acquires the force values at both ends of the shock absorber 4 in real time and transmits them to the control module to generate a force fluctuation coefficient; the displacement acquisition module acquires the displacement change of the piston rod of the shock absorber 4 in real time and transmits it to the control module to generate a displacement change coefficient; the control module combines the preset weight coefficients to comprehensively operate the force fluctuation coefficient and the displacement change coefficient to generate an evaluation coefficient; the evaluation coefficient is compared with the preset reference threshold value, if the evaluation coefficient is less than the reference threshold value, the current test parameters are maintained; if the evaluation coefficient is greater than or equal to the reference threshold value, the output force, motion frequency or test time of the actuator are adjusted; the above process is continued until the performance detection of the shock absorber 4 is completed.

[0067] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can make equivalent substitutions or changes to the technical solution and inventive concept of the present application within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A vehicle shock absorber performance testing device, comprising a base (1), a mounting bracket (2), a positioning pin (3), a positioning stud (5), and a positioning bolt (6), characterized in that, The mounting bracket (2) is fixedly connected to the base (1). The positioning pin (3) can adjust the vertical distance on the mounting bracket (2) and is used to insert into the ring part at the top end of the shock absorber (4). The positioning stud (5) is used to insert into the ring part at the bottom end of the shock absorber (4) and is locked by the positioning bolt (6). The positioning stud (5) is connected with an actuator. The actuator pulls or squeezes the lower end of the shock absorber (4) through the positioning stud (5). There is also a control system which, through an integrated sensor and a control module, monitors the displacement and force changes of the shock absorber (4) in real time and dynamically adjusts the test parameters based on data analysis.

2. The vehicle shock absorber performance testing device according to claim 1, characterized in that, The actuator includes an electric push rod (7). The electric push rod (7) is fixedly connected to the base (1), and the positioning stud (5) is installed on the output shaft of the electric push rod (7).

3. The vehicle shock absorber performance testing device according to claim 1, characterized in that, The actuator includes a motor (8) and a turntable (9). The motor (8) is fixedly connected to the base (1), the turntable (9) is installed on the output shaft of the motor (8), and the positioning stud (5) is installed at the edge position of the turntable (9).

4. A vehicle shock absorber performance testing device according to claim 1, 2, or 3, characterized in that, A sliding opening (10) is formed on the mounting bracket (2). A slider (12) is slidably connected in the sliding opening (10). An adjusting screw rod (11) which is threadedly connected to the slider (12) is rotatably connected in the sliding opening (10). The positioning pin (3) is installed at the end of the slider (12).

5. The vehicle shock absorber performance testing device according to claim 1, characterized in that, The control system includes: A force acquisition module, which is used to measure the force received by the shock absorber (4) in real time and generate a force fluctuation coefficient through the control module; A displacement acquisition module, which is used to measure the displacement change of the shock absorber (4) in real time and generate a displacement change coefficient through the control module; The control module comprehensively analyzes the generated force fluctuation coefficient and displacement change coefficient to generate an evaluation coefficient. The evaluation coefficient is compared with a preset reference threshold, and the working state of the actuator is controlled according to the comparison result.

6. The vehicle shock absorber performance testing device according to claim 5, characterized in that, The output end and input end of the force acquisition module, and the output end and input end of the displacement acquisition module are electrically connected to the input end and output end of the control module respectively. The output end of the control module is electrically connected to the input end of the actuator.

7. The vehicle shock absorber performance testing device according to claim 5, characterized in that, The execution steps for the control module to control the working state of the actuator according to the comparison result are as follows: The force acquisition module acquires the force received by the shock absorber (4); the displacement acquisition module acquires the displacement change of the shock absorber (4); the control module calculates the force fluctuation coefficient, the displacement change coefficient and the evaluation coefficient Rpg; if Rpg < R threshold: maintain the current test parameters; if Rpg ≥ R threshold: increase the output force of the actuator, extend the test time or reduce the movement frequency.

8. The vehicle shock absorber performance testing device according to claim 5, characterized in that, The generation logic of the force fluctuation coefficient is: Obtain the actual force values of the shock absorber (4) at different moments within the time T through the force acquisition module; calculate the force fluctuation coefficient reflecting the force value fluctuation based on the fluctuation degree between the actual force value and the average force value.

9. The vehicle shock absorber performance testing device according to claim 5, characterized in that, The generation logic of the displacement change coefficient is: Obtain the actual displacement values of the shock absorber (4) at different moments within the time T through the displacement acquisition module; calculate the displacement change coefficient reflecting the displacement change situation based on the fluctuation degree between the actual displacement value and the average displacement value.

10. The vehicle shock absorber performance testing device according to claim 5, characterized in that, The generation logic of the evaluation coefficient is: The control module performs dynamic trade-off calculations based on the displacement change coefficient and force fluctuation coefficient, combined with preset weighting coefficients, to generate a comprehensive evaluation coefficient for assessing the performance of the shock absorber.

Images