Pulse lateral force loading device for automobile shock absorber

Abstract

The invention discloses a pulse lateral force loading device for an automobile shock absorber. The pulse lateral force loading device comprises a low-temperature environment simulation box, a pulse loading mechanism, a shock absorber fixing device, a control system and a data acquisition system, a heat preservation layer and a temperature adjusting device are arranged in the low-temperature environment simulation box, and the temperature adjusting range is-40 DEG C to 70 DEG C; the pulse loading mechanism comprises a proportional valve, an electromagnetic valve, an air cylinder, a lateral force loading arm and a force value sensor, the proportional valve is connected with the air cylinder through a pipeline, one end of the lateral force loading arm is hinged to the output end of the air cylinder, and the other end of the lateral force loading arm makes contact with the shock absorber locking block through the force value sensor; the control system comprises a PLC, the PLC is electrically connected with a temperature sensor, a force value sensor, a proportional valve and an electromagnetic valve, and temperature and lateral force are controlled in a closed-loop mode through a PID algorithm. By integrating the low-temperature environment simulation box and the pulse loading mechanism, the problem that dynamic pulse lateral force cannot be simulated in a low-temperature environment in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive component testing, and particularly to a pulse lateral force loading device for a shock absorber. Background Art

[0002] As is well known, an automotive shock absorber is an important part of a vehicle suspension system, and its performance directly affects the comfort and safety of the vehicle. In actual use, the shock absorber not only needs to withstand impacts in the vertical direction but also lateral loads. Especially in a low-temperature environment, the material properties and damping characteristics of the shock absorber will change. Therefore, it is necessary to conduct lateral loading tests on the shock absorber in a low-temperature environment.

[0003] Currently, most of the existing loading devices have the following limitations:

[0004] 1. Most of them work in a normal-temperature environment and it is difficult to simulate lateral loads in a low-temperature environment;

[0005] 2. The loading methods are mostly static or low-frequency dynamic loading, and it is impossible to truly simulate the pulsed lateral impact suffered by the vehicle during actual driving. Summary of the Invention

[0006] The purpose of the present invention is to provide a pulse lateral force loading device that can act on an automotive shock absorber in a low-temperature environment.

[0007] To achieve the above purpose, the present invention adopts the following technical solution: A pulse lateral force loading device for an automotive shock absorber, characterized in that it includes a low-temperature environment simulation chamber, a pulse loading mechanism, a shock absorber fixing device, a control system, and a data acquisition system; the interior of the low-temperature environment simulation chamber is provided with a heat preservation layer and a temperature adjustment device, and the temperature adjustment range is from -40°C to 70°C; the pulse loading mechanism includes a proportional valve, a solenoid valve, a cylinder, a lateral force loading arm, and a force value sensor. The proportional valve is connected to the cylinder through a pipeline. One end of the lateral force loading arm is hinged to the output end of the cylinder, and the other end contacts the shock absorber locking block through the force value sensor; the control system includes a PLC, and the PLC is electrically connected to a temperature sensor, a force value sensor, a proportional valve, and a solenoid valve respectively, and controls the temperature and lateral force in a closed loop through a PID algorithm; the data acquisition system is communicatively connected to the control system and real-time collects the displacement, acceleration, and damping force parameters of the shock absorber.

[0008] In one embodiment, an adjustable pre-tightening mechanism is provided between the lateral force loading arm and the shock absorber locking block. The pre-tightening mechanism includes an adjusting bolt and a locking nut. The axial movement of the adjusting bolt is fixed by the locking nut to ensure that the initial signal of the force value sensor is zero.

[0009] In one embodiment, the cylinder is an aluminum alloy cylinder. A piston rod is provided inside the cylinder, and the surface of the piston rod is coated with a hard coating resistant to low temperature. The thickness of the hard coating is not less than 0.1 mm.

[0010] In one embodiment, the control system further includes an analog input / output module and a digital input / output module. The analog input / output module is connected to a force value sensor and a proportional valve, and the digital input / output module is connected to a solenoid valve and a temperature regulating device.

[0011] In one embodiment, the data acquisition system includes an industrial control computer, which is built-in with a data storage module and real-time analysis software. The real-time analysis software is configured to synchronously display the time-domain curves of displacement, acceleration, and damping force.

[0012] In one embodiment, the shock absorber fixing device includes a height adjustment handwheel and a multi-directional locking block. The height adjustment handwheel drives the locking block to move in the vertical direction through a screw pair to adapt to shock absorbers of different sizes.

[0013] In one embodiment, the refrigeration fan of the low-temperature environment simulation chamber is a variable-frequency motor. The variable-frequency motor dynamically adjusts its speed according to the PID control instruction of the PLC to maintain the temperature fluctuation inside the chamber not exceeding ±1°C.

[0014] In one embodiment, the resolution of the proportional valve is not less than 0.1% FS, the response time is less than 10 ms, and the output air pressure has a linear relationship with the input electrical signal.

[0015] In one embodiment, the pulse loading mechanism further includes a buffer spring. The buffer spring is arranged between the cylinder and the lateral force loading arm to absorb the impact vibration at the output end of the cylinder.

[0016] In one embodiment, the data acquisition system is configured to export a standardized format file of experimental data, and the standardized format file is compatible with analysis software such as MATLAB, LabVIEW, and ANSYS.

[0017] After adopting the above technical solutions, the present invention has the following advantages:

[0018] 1. In the present invention, by integrating a low-temperature environment simulation chamber and a pulse loading mechanism, the problem that the prior art cannot simulate dynamic pulse lateral force in a low-temperature environment is solved. The low-temperature environment simulation chamber adopts a thermal insulation layer and a temperature-adjustable device to ensure that the temperature inside the chamber is uniformly stable at -40°C, simulating the real low-temperature working condition; the pulse loading mechanism works in cooperation with a proportional valve and a solenoid valve, and combines a cold-resistant cylinder and a force value sensor to accurately generate a pulsed lateral force at low temperature, with adjustable amplitude and frequency, truly restoring the impact load during vehicle driving. The control system adopts a PLC and a PID algorithm to achieve closed-loop control of temperature and force, avoiding the error accumulation problem of traditional open-loop control, and improving the loading accuracy to ±20N. The data acquisition system records the response parameters of the shock absorber in real time, providing multi-dimensional data support for performance evaluation. Compared with the prior art that only tests static force, this solution significantly improves the accuracy of the test results and the coverage of working conditions.

[0019] 2. By adding a pre-tightening mechanism, the contact stability between the loading arm and the shock absorber is further optimized. The cooperative design of the adjusting bolt and the locking nut can eliminate mechanical clearance during installation, ensure that the initial state of the force value sensor is zeroed, and avoid measurement deviation caused by assembly error. This structure can still maintain high stiffness in a low-temperature environment, preventing the attenuation of the pre-tightening force caused by material shrinkage, thereby improving the calibration accuracy of the force value sensor. Before the experiment, the zeroing operation can be completed only by manual adjustment, simplifying the test process, especially suitable for the rapid adaptation of different models of shock absorbers, and significantly improving the versatility and test efficiency of the device.

[0020] 3. By setting the cylinder as an aluminum alloy cylinder and combining a piston rod with a hard coating, and setting the thickness of the hard coating to be not less than 0.1mm, the problem that traditional cylinders are prone to jamming or seal failure at low temperature is solved. The aluminum alloy material still maintains high toughness at low temperature, avoiding brittle fracture; the hard coating (such as diamond-like carbon coating) significantly reduces the friction coefficient between the piston rod and the sealing ring, ensuring smooth operation of the cylinder in a -40°C environment. At the same time, the wide temperature range design (-60°C to 100°C) covers extreme test conditions, avoiding the attenuation of cylinder performance caused by temperature fluctuations. This design extends the service life of the cylinder, reduces the maintenance cost, and ensures the stability and repeatability of pulse loading.

[0021] 4. By separating the analog and digital modules, efficient isolation and precise control of signal transmission are achieved. The analog module directly processes the continuous signal of the force value sensor and the adjustment instruction of the proportional valve, reducing the delay and noise interference in the signal conversion link; the digital module independently controls the switching frequency of the solenoid valve and the start and stop of the temperature adjustment device to ensure the precise matching of the timing of pulse loading and temperature control. This architecture avoids the problem of control inaccuracy caused by multi-signal cross-interference. Especially during high-frequency pulse loading (such as 5Hz), the system response speed is increased by more than 30%, further ensuring the dynamic accuracy of the loading force.

[0022] 5. By introducing an industrial control computer and real-time analysis software, the traditional offline data processing is upgraded to online dynamic monitoring. The data storage module supports the complete recording of long-term continuous test data, avoiding data loss caused by insufficient storage capacity; the real-time analysis software visualizes through time-domain curves, enabling operators to immediately judge whether the shock absorber response is abnormal (such as sudden changes in damping force or displacement exceeding the limit), thereby terminating the test in advance or adjusting parameters. This design significantly shortens the data analysis cycle, improves the test efficiency, and provides an intuitive graphical basis for subsequent performance optimization.

[0023] 6. The combined design of the height adjustment handwheel and multi-directional locking block realizes the rapid adaptation ability of the shock absorber fixing device. The screw pair transmission mechanism provides high-precision vertical displacement adjustment to ensure that the central axes of different models of shock absorbers are aligned with the loading arm, avoiding uneven lateral force distribution caused by installation eccentricity. The multi-directional locking block adopts a split structure and can be fixed in multiple degrees of freedom by tightening bolts, and still maintains stable locking force in low-temperature environments. This design improves the device compatibility to cover more than 90% of the commercially available shock absorber models, reducing the development cost of customized fixtures.

[0024] 7. By introducing a variable-frequency refrigeration fan, the problem that traditional fixed-frequency fans are prone to temperature overshoot or fluctuations in low-temperature control is solved. The PLC calculates the temperature deviation in real time through the PID algorithm and dynamically adjusts the speed of the variable-frequency motor to make the refrigeration capacity accurately match the internal heat load of the chamber. This control strategy compresses the temperature fluctuation range from the traditional ±3°C to ±1°C. Especially in high and low temperature alternating tests (such as -40°C to 70°C cycle), it avoids errors in material performance tests caused by temperature instability, ensuring the repeatability and comparability of experimental data.

[0025] 8. The ultra-high resolution and fast response characteristics of the proportional valve significantly improve the transient accuracy of lateral force loading. The resolution of 0.1% FS ensures that the control error is less than 1N under a full scale of 1000N. Combined with a response speed of the order of 10ms, it can accurately track the waveform changes of high-frequency pulse signals (such as 5Hz). The linear input-output relationship simplifies the complexity of the control algorithm, avoiding the delay introduced by the non-linear compensation link, and thus can still achieve stable lateral force loading at extremely low temperatures, providing a high-fidelity load input for the dynamic characteristic test of shock absorbers.

[0026] 9. The addition of a buffer spring effectively suppresses the mechanical shock and high-frequency vibration generated by the cylinder action. During the pulse loading process, the rapid start and stop of the cylinder piston are likely to trigger system resonance, resulting in lateral force fluctuations or sensor signal noise. The buffer spring absorbs the instantaneous kinetic energy through elastic deformation, converts the impact energy into elastic potential energy and slowly releases it, making the movement of the loading arm smoother. This design reduces the signal noise of the force value sensor by more than 50%. Especially during high-frequency loading, it improves the signal-to-noise ratio of the data and ensures the measurement accuracy of key parameters such as damping force.

[0027] 10. The output of standardized data formats breaks down the barriers between test data and mainstream analysis software. It is compatible with the formats of tools such as MATLAB (such as.csv or.mat files), allowing users to directly call existing scripts for batch processing or advanced algorithm analysis (such as Fourier transform or fatigue life prediction) without the need to develop additional data conversion interfaces. This design significantly shortens the cycle from testing to analysis and supports cross-platform data sharing, providing a seamless data foundation for the multi-dimensional performance evaluation of shock absorbers (such as frequency domain characteristics or structural strength simulation). Brief Description of the Drawings

[0028] The present invention will be further described below with reference to the accompanying drawings:

[0029] Figure 1 It is a schematic structural diagram of the pulse lateral force loading device for an automotive shock absorber according to the present invention.

[0030] Figure 2 It is a schematic control logic diagram of the pulse lateral force loading device for an automotive shock absorber according to the present invention.

[0031] The names of the components marked in the figure are as follows:

[0032] 1. Low-temperature environment simulation box; 11. Thermal insulation layer; 12. Temperature adjustment device; 2. Pulse loading mechanism; 21. Proportional valve; 22. Solenoid valve; 23. Cylinder; 24. Lateral force loading arm; 25. Force value sensor; 26. Temperature sensor; 27. Piston rod; 28. Buffer spring; 3. Shock absorber fixing device; 31. Height adjustment handwheel; 32. Multi-directional locking block; 4. Control system; 41. PLC; 42. Analog input / output module; 43. Digital input / output module; 5. Data acquisition system; 51. Industrial control computer; 6. Shock absorber locking block; 7. Pre-tightening mechanism; 71. Adjusting bolt; 72. Locking nut. Detailed Embodiments

[0033] In order to more clearly illustrate the overall concept of the present invention, it will be further described in detail below by way of examples with reference to the accompanying drawings of the specification.

[0034] It should be noted that many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited by the specific embodiments disclosed below.

[0035] In addition, in the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 a limitation of the present invention.

[0036] In the present invention, unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be directly connected or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements. However, indicating a direct connection means that there is no connection relationship constructed through an excessive structure between the two connected main bodies, and they are only connected through the connection structure to form an integral body. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0038] Such as Figures 1 to 2As shown in the figure, the present invention provides a pulse lateral force loading device for an automotive shock absorber, which includes a low-temperature environment simulation box 1, a pulse loading mechanism 2, a shock absorber fixing device 3, a control system 4, and a data acquisition system 5. The low-temperature environment simulation box 1 is internally provided with a heat preservation layer 11 and a temperature regulating device 12, and its temperature regulation range is from -40°C to 70°C. The pulse loading mechanism 2 includes a proportional valve 21, a solenoid valve 22, a cylinder 23, a lateral force loading arm 24, and a force value sensor 25. The proportional valve 21 is connected to the cylinder 23 through a pipeline. One end of the lateral force loading arm 24 is hinged to the output end of the cylinder 23, and the other end contacts the shock absorber locking block 6 through the force value sensor 25. The control system 4 includes a PLC 41, which is electrically connected to a temperature sensor 26, a force value sensor 25, a proportional valve 21, and a solenoid valve 22 respectively, and closed-loop controls the temperature and lateral force through the PID algorithm. The data acquisition system 5 is communicatively connected to the control system 4, and in real time collects the displacement, acceleration, and damping force parameters of the shock absorber. By integrating the low-temperature environment simulation box and the pulse loading mechanism, the problem that the prior art cannot simulate dynamic pulse lateral force in a low-temperature environment is solved. The low-temperature environment simulation box adopts a heat preservation layer and a temperature-adjustable device to ensure that the temperature inside the box is uniformly stable at -40°C, simulating the real low-temperature working condition. The pulse loading mechanism works in coordination with the proportional valve and the solenoid valve, and combines a cold-resistant cylinder and a force value sensor, and can accurately generate a pulsed lateral force at low temperature, with adjustable amplitude and frequency, truly restoring the impact load during vehicle driving. The control system adopts a PLC and the PID algorithm to realize the closed-loop control of temperature and force, avoiding the error accumulation problem of traditional open-loop control, and improving the loading accuracy to ±20N. The data acquisition system records the response parameters of the shock absorber in real time, providing multi-dimensional data support for performance evaluation. Compared with the prior art that only tests static force, this solution significantly improves the accuracy of the test results and the working condition coverage range.

[0039] In some embodiments, an adjustable pre-tightening mechanism 7 is provided between the lateral force loading arm 24 and the shock absorber locking block 6. The pre-tightening mechanism 7 includes an adjusting bolt 71 and a locking nut 72. The axial movement of the adjusting bolt 71 is fixed by the locking nut 72 to ensure that the initial signal of the force value sensor 25 is zero. By adding the pre-tightening mechanism, the contact stability between the loading arm and the shock absorber is further optimized. The cooperative design of the adjusting bolt and the locking nut can eliminate mechanical clearance during installation, ensure that the force value sensor is in the initial state of zero, and avoid measurement deviation caused by assembly error. This structure can still maintain high stiffness in a low-temperature environment, prevent the attenuation of the pre-tightening force caused by material shrinkage, and thus improve the calibration accuracy of the force value sensor. Before the experiment, the zeroing operation can be completed only through manual adjustment, simplifying the test process, especially suitable for the rapid adaptation of different models of shock absorbers, and significantly improving the versatility and test efficiency of the device.

[0040] In some embodiments, the cylinder 23 is an aluminum alloy cylinder. A piston rod 27 is disposed inside the cylinder 23. The surface of the piston rod 27 is plated with a hard coating resistant to low temperatures. The thickness of the hard coating is not less than 0.1 mm. By setting the cylinder as an aluminum alloy cylinder and combining it with a piston rod provided with a hard coating, and setting the thickness of the hard coating to be not less than 0.1 mm, the problem that traditional cylinders are prone to jamming or seal failure at low temperatures is solved. The aluminum alloy material still maintains high toughness at low temperatures, avoiding brittle fracture; the hard coating (such as a diamond-like carbon coating) greatly reduces the friction coefficient between the piston rod and the sealing ring, ensuring smooth operation of the cylinder in an environment of -40°C. At the same time, the wide temperature range design (-60°C to 100°C) covers extreme test conditions, avoiding the attenuation of cylinder performance caused by temperature fluctuations. This design extends the service life of the cylinder, reduces the maintenance cost, and ensures the stability and repeatability of pulse loading.

[0041] In some embodiments, the control system 4 further includes an analog input / output module 42 and a digital input / output module 43. The analog input / output module 42 is connected to the force value sensor 25 and the proportional valve 21, and the digital input / output module 43 is connected to the solenoid valve 22 and the temperature regulating device 12. Through the discrete analog and digital modules, efficient isolation and precise control of signal transmission are achieved. The analog module directly processes the continuous signals of the force value sensor and the adjustment instructions of the proportional valve, reducing the delay and noise interference in the signal conversion link; the digital module independently controls the switching frequency of the solenoid valve and the start and stop of the temperature regulating device, ensuring precise matching of the timing of pulse loading and temperature control. This architecture avoids the problem of control inaccuracy caused by multi-signal cross-interference. Especially during high-frequency pulse loading (such as 5 Hz), the system response speed is increased by more than 30%, further ensuring the dynamic accuracy of the loading force.

[0042] In some embodiments, the data acquisition system 5 includes an industrial control computer 51. The industrial control computer 51 is built-in with a data storage module and real-time analysis software. The real-time analysis software is configured to synchronously display the time-domain curves of displacement, acceleration, and damping force. By introducing the industrial control computer and the real-time analysis software, the traditional offline data processing is upgraded to online dynamic monitoring. The data storage module supports the complete recording of long-term continuous test data, avoiding data loss caused by insufficient storage capacity; the real-time analysis software visualizes through the time-domain curves, enabling operators to immediately judge whether the shock absorber response is abnormal (such as sudden change in damping force or displacement exceeding the limit), thereby terminating the test in advance or adjusting parameters. This design greatly shortens the data analysis cycle, improves the test efficiency, and provides an intuitive graphical basis for subsequent performance optimization.

[0043] In some embodiments, the shock absorber fixing device 3 includes a height adjustment handwheel 31 and a multi-directional locking block 32. The height adjustment handwheel 31 drives the locking block 32 to move in the vertical direction through a screw pair to adapt to shock absorbers of different sizes. The combined design of the height adjustment handwheel and the multi-directional locking block realizes the fast adaptation ability of the shock absorber fixing device. The screw pair transmission mechanism provides high-precision vertical displacement adjustment to ensure that the central axes of shock absorbers of different models are aligned with the loading arm, avoiding uneven lateral force distribution caused by eccentric installation. The multi-directional locking block adopts a split structure and can be fixed with multiple degrees of freedom by tightening bolts, and still maintains stable locking force in a low-temperature environment. This design improves the device compatibility to cover more than 90% of the commercially available shock absorber models, reducing the development cost of customized jigs.

[0044] In some embodiments, the refrigeration fan of the low-temperature environment simulation chamber 1 is a variable-frequency motor. The variable-frequency motor dynamically adjusts the speed according to the PID control instruction of the PLC 41 to maintain the temperature fluctuation in the chamber within ±1°C. By introducing the variable-frequency refrigeration fan, the problem that traditional fixed-frequency fans are prone to temperature overshoot or fluctuation in low-temperature control is solved. The PLC calculates the temperature deviation in real time through the PID algorithm and dynamically adjusts the speed of the variable-frequency motor to make the refrigeration capacity accurately match the heat load in the chamber. This control strategy compresses the temperature fluctuation range from the traditional ±3°C to ±1°C. Especially in the high and low temperature alternating test (such as -40°C to 70°C cycle), it avoids the material performance test error caused by temperature instability, ensuring the repeatability and comparability of experimental data.

[0045] In some embodiments, the resolution of the proportional valve 21 is not less than 0.1% FS, the response time is less than 10 ms, and the output air pressure has a linear relationship with the input electrical signal. The ultra-high resolution and fast response characteristics of the proportional valve 21 significantly improve the transient accuracy of lateral force loading. The resolution of 0.1% FS ensures that the control error is less than 1 N under a full scale of 1000 N. Combined with a response speed of the order of 10 ms, it can accurately track the waveform change of high-frequency pulse signals (such as 5 Hz). The linear input-output relationship simplifies the complexity of the control algorithm and avoids the delay introduced by the non-linear compensation link, so that stable lateral force loading can still be achieved at extremely low temperatures, providing a high-fidelity load input for the dynamic characteristic test of shock absorbers.

[0046] In some embodiments, the pulse loading mechanism 2 further includes a buffer spring 28. The buffer spring 28 is disposed between the cylinder 23 and the lateral force loading arm 24 and is used to absorb the impact vibration at the output end of the cylinder 23. By adding the buffer spring, the mechanical impact and high-frequency vibration generated by the cylinder action are effectively suppressed. During the pulse loading process, the rapid start and stop of the cylinder piston are likely to cause system resonance, resulting in lateral force fluctuations or sensor signal noise. The buffer spring absorbs the instantaneous kinetic energy through elastic deformation, converts the impact energy into elastic potential energy and slowly releases it, making the movement of the loading arm smoother. This design reduces the signal noise of the force value sensor by more than 50%. Especially during high-frequency loading, it improves the signal-to-noise ratio of the data and ensures the measurement accuracy of key parameters such as damping force.

[0047] In some embodiments, the data acquisition system 5 is configured to export experimental data in a standardized format file, and the standardized format file is compatible with MATLAB, LabVIEW, and ANSYS analysis software. The output of the standardized data format breaks down the barriers between test data and mainstream analysis software. Compatibility with formats supported by tools such as MATLAB (such as.csv or.mat files) allows users to directly call existing scripts for batch processing or advanced algorithm analysis (such as Fourier transform or fatigue life prediction) without the need to develop additional data conversion interfaces. This design significantly shortens the cycle from testing to analysis and supports cross-platform data sharing, providing a seamless data foundation for multi-dimensional performance evaluation of shock absorbers (such as frequency domain characteristics or structural strength simulation).

[0048] Except for the above preferred embodiments, the technical solutions protected by the present invention are not limited to the above embodiments. It should be noted that the combination of the technical solutions of any one embodiment with the technical solutions of one or more other embodiments is within the protection scope of the present invention. Although the present invention has been described in detail above with general descriptions and specific embodiments, based on the present invention, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of the present invention claimed.

Claims

1. A pulse lateral force loading device for an automotive shock absorber, characterized in that, It includes a low-temperature environment simulation chamber, a pulse loading mechanism, a shock absorber fixing device, a control system, and a data acquisition system; the interior of the low-temperature environment simulation chamber is provided with a heat preservation layer and a temperature regulating device, and the temperature regulating range is from -40°C to 70°C; the pulse loading mechanism includes a proportional valve, a solenoid valve, a cylinder, a lateral force loading arm, and a force value sensor, the proportional valve is connected to the cylinder through a pipeline, one end of the lateral force loading arm is hinged to the output end of the cylinder, and the other end contacts the shock absorber locking block through the force value sensor; the control system includes a PLC, the PLC is electrically connected to the temperature sensor, the force value sensor, the proportional valve, and the solenoid valve respectively, and closed-loop controls the temperature and the lateral force through the PID algorithm; the data acquisition system is communicatively connected to the control system and real-time collects the displacement, acceleration, and damping force parameters of the shock absorber.

2. The pulse lateral force loading device according to claim 1, wherein An adjustable pre-tightening mechanism is provided between the lateral force loading arm and the shock absorber locking block, the pre-tightening mechanism includes an adjusting bolt and a locking nut, and the axial movement of the adjusting bolt is fixed by the locking nut to ensure that the initial signal of the force value sensor is zero.

3. The pulse lateral force loading device according to claim 1, characterized in that: The cylinder is an aluminum alloy cylinder, a piston rod is provided inside the cylinder, and the surface of the piston rod is coated with a low-temperature resistant hard coating, and the thickness of the hard coating is not less than 0.1 mm.

4. The pulse lateral force loading device according to claim 1, characterized in that: The control system further includes an analog input / output module and a digital input / output module, the analog input / output module is connected to the force value sensor and the proportional valve, and the digital input / output module is connected to the solenoid valve and the temperature regulating device.

5. The pulse side force loading device according to claim 1, wherein The data acquisition system includes an industrial computer, the industrial computer is built-in with a data storage module and real-time analysis software, and the real-time analysis software is configured to synchronously display the time-domain curves of displacement, acceleration, and damping force.

6. The pulse lateral force loading device according to claim 1, characterized in that, The shock absorber fixing device includes a height adjusting handwheel and a multi-directional locking block, and the height adjusting handwheel drives the locking block to move in the vertical direction through a screw pair to adapt to shock absorbers of different sizes.

7. The pulse lateral force loading device according to claim 1, wherein The refrigeration fan of the low-temperature environment simulation chamber is a variable-frequency motor, and the variable-frequency motor dynamically adjusts the rotation speed according to the PID control instruction of the PLC to maintain the temperature fluctuation in the chamber not exceeding ±1°C.

8. The pulsed lateral force loading device according to claim 1, characterized in that, The resolution of the proportional valve is not less than 0.1% FS, the response time is less than 10 ms, and the output air pressure has a linear relationship with the input electrical signal.

9. The pulse lateral force loading device according to claim 1, wherein The pulse loading mechanism further includes a buffer spring, and the buffer spring is arranged between the cylinder and the lateral force loading arm to absorb the impact vibration at the output end of the cylinder.

10. The pulsed lateral force loading device according to claim 1, wherein The data acquisition system is configured to export a standardized format file of experimental data, and the standardized format file is compatible with MATLAB, LabVIEW, and ANSYS analysis software.

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