Automobile plate spring damping performance detection device

Abstract

The utility model provides an automobile plate spring damping performance detection device which comprises a displacement sensing module arranged on a frame girder, a control module and a display module. The displacement sensing module is used for detecting the deformation quantity of the plate spring in the vertical direction within the time period before and after an automobile passes through the ground roadblock; the signal output end of the displacement sensing module is electrically connected with the signal input end of the control module, and the control module receives the deformation quantity, collected by the displacement sensing module, of the plate spring in the vertical direction. The control module is electrically connected with the display module, and the control module controls the display module to display the deformation quantity of the plate spring in the vertical direction within the time period before and after an automobile passes through the ground roadblock. The device for detecting the damping performance of the automobile plate spring is simple in structure, convenient to install and implement, low in cost and capable of rapidly and visually analyzing the damping performance of the automobile plate spring.

Description

Technical Field

[0001] This utility model relates to the field of automotive engineering technology, specifically to a device for testing the vibration damping performance of automotive leaf springs. Background Technology

[0002] As a core load-bearing component of the automotive suspension system, the leaf spring plays a crucial role in transmitting vertical loads, mitigating road impacts, and maintaining vehicle stability. Its damping performance directly affects the vehicle's ride smoothness, passenger comfort, and component lifespan, making it an important indicator of automotive chassis tuning and safety.

[0003] Current methods for testing the vibration damping performance of vehicle leaf springs are too cumbersome and complex. For example, they involve analyzing basic indicators such as the static stiffness and fatigue life of the leaf springs, and then combining this with material properties, structural characteristics, and the dynamic characteristics of the active suspension system to ultimately determine the vehicle's leaf spring vibration damping performance. The testing structures and methods involved in these methods are quite complex and inconvenient to implement during testing. Utility Model Content

[0004] In order to overcome the defects in the existing technology, the purpose of this utility model is to provide a device for testing the vibration damping performance of automotive leaf springs.

[0005] To achieve the above-mentioned objectives of this utility model, this utility model provides an automotive leaf spring damping performance testing device, comprising: a displacement sensing module disposed on the vehicle frame beam, a control module, and a display module;

[0006] The displacement sensing module detects the vertical deformation of the leaf spring during the time period before and after the car passes over the ground obstacle; the signal output terminal of the displacement sensing module is electrically connected to the signal input terminal of the control module, and the control module receives the vertical deformation of the leaf spring collected by the displacement sensing module.

[0007] The control module is electrically connected to the display module, and the control module controls the display module to display the deformation of the leaf spring in the vertical direction during the time period before and after the car passes over the road obstacle.

[0008] This automotive leaf spring damping performance testing device collects the vertical deformation of the leaf springs before and after a vehicle passes over a road obstacle, and displays these deformations. The display module allows for direct observation of two stages: the first stage, from the start of deformation to the peak deformation; and the second stage, from the peak deformation back to the initial state. By observing the duration of these two stages, testers can analyze the vehicle's leaf spring damping performance. Generally, if the second stage lasts longer than the first stage, it indicates better leaf spring damping performance.

[0009] Optionally, component one of the displacement sensing module is located at the lowest horizontal point of the vehicle leaf spring, and component two of the displacement sensing module is located on the vehicle frame beam opposite to component one of the displacement sensing module and on the same vertical line.

[0010] This optional solution facilitates the installation of the displacement sensor module and can accurately collect the deformation of the leaf spring in the vertical direction during the time period before and after the vehicle passes over the ground obstacle.

[0011] Optionally, the lowest horizontal point of the automotive leaf spring is the center position of the concave surface of the leaf spring.

[0012] Optionally, a timing module is also included, which is connected to the control module. The control module controls the timing module to start timing when the displacement sensor detects that the leaf spring has deformed in the vertical direction.

[0013] This alternative solution allows for more accurate time-based positioning of the sampling data from the displacement sensor module.

[0014] Optionally, the timing module is integrated into the control module, which can make the detection device more integrated.

[0015] Optionally, the displacement sensing module is a high-precision laser displacement sensor.

[0016] Optionally, a vibration sensing module is also provided on the leaf spring. The signal output terminal of the vibration sensing module is electrically connected to the corresponding signal input terminal of the control module. The control module triggers the displacement sensing module to detect vibration based on the vibration signal collected by the vibration sensor.

[0017] This optional solution can accurately trigger the displacement sensing module to work.

[0018] Optionally, it also includes a signal processing module, wherein the signal output terminal of the displacement sensing module is connected to the input terminal of the signal processing module, and the output terminal of the signal processing module is electrically connected to the corresponding signal input terminal of the control module.

[0019] The beneficial effects of this utility model are:

[0020] This automotive leaf spring damping performance testing device has a simple structure, is easy to install and implement, and is inexpensive. It can quickly and intuitively analyze the damping performance of automotive leaf springs.

[0021] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0023] Figure 1 This is an installation diagram of this utility model;

[0024] Figure 2 This is a schematic diagram illustrating the principle of this utility model;

[0025] Figure 3 It is a curve of the deformation of the leaf spring in the vertical direction over time, collected under constant load or smooth driving conditions of a car. Detailed Implementation

[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein 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 with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0027] In the description of this utility model, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two components. They can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0028] like Figure 1 and Figure 2 As shown, this utility model provides a vehicle leaf spring damping performance testing device, including: a displacement sensing module installed on the vehicle frame beam 3, and also including a signal processing module, a timing module, a control module and a display module.

[0029] The displacement sensing module is used to detect the vertical deformation of the leaf spring 1 before and after the vehicle passes over a road obstacle. Specifically, in this embodiment, component 21 of the displacement sensing module is mounted on the lowest horizontal point of the leaf spring 1 via mounting bracket 6. The lowest horizontal point of the leaf spring 1 is generally the center of the concave surface of the leaf spring 1. In this embodiment, component 21 of the displacement sensing module is mounted on the center of the concave surface of the leaf spring 1. Component 22 of the displacement sensing module is mounted on the frame beam 3 via mounting bracket 4, and component 22 of the displacement sensing module is positioned opposite to component 21 of the displacement sensor and is on the same vertical line. One of component 21 and component 22 of the displacement sensing module is a signal transmitting end, and the other is a signal receiving end. The displacement sensing module preferably uses, but is not limited to, a high-precision laser sensor. When the car passes over the road obstacle, the leaf spring 1 deforms, and the center of its concave surface moves upward. After the car passes over the road obstacle, the leaf spring 1 returns to its original position, and the center of its concave surface moves downward. The displacement sensing module detects the vertical distance between the center of the concave surface of the leaf spring 1 and the frame beam 3 during the time period before and after the car passes over the road obstacle, thus obtaining the deformation of the leaf spring 1 in the vertical direction during the time period before and after the car passes over the road obstacle.

[0030] The signal output terminal of the displacement sensing module is connected to the input terminal of the signal processing module, and the output terminal of the signal processing module is electrically connected to the corresponding signal input terminal of the control module. The signal processing module processes the deformation signal acquired by the displacement sensing module, such as filtering, noise reduction, and AD conversion, and then sends it to the control module.

[0031] The timing module is connected to the control module. The control module controls the timing module to start timing when the displacement sensor detects deformation of leaf spring 1 in the vertical direction. This allows for a more intuitive detection of the time required for leaf spring 1 to deform from the beginning to the maximum value and then return to its initial state. This time reflects the shock absorption performance of the automotive leaf spring; the longer the recovery time, the better the shock absorption performance. The timing module can be integrated into the control module.

[0032] The control module and the display module are electrically connected. After receiving the processed deformation data, the control module controls the display module to display these deformation data. The display format can be a table of deformation data or a curve showing the change of deformation data over time, such as... Figure 3 As shown, the curve includes two stages: the first stage is from the beginning of deformation of leaf spring 1 to the point where the deformation reaches its maximum value; the second stage is from the point where leaf spring 1 reaches its maximum value to the point where it returns to its initial state. If the duration of the second stage is longer than that of the first stage, it indicates that the car has a longer time to recover its stability, giving the driver and passengers more time to adapt, resulting in a better driving experience and less impact on the car's components. This suggests that the car's leaf spring has better shock absorption performance.

[0033] In this embodiment, the high-precision laser displacement sensor may be, but is not limited to, a laser sensor of model GP2Y0A21; the signal processing module may be, but is not limited to, AD620 and ADS1115 (16-bit ADC); the timing module may be, but is not limited to, a DS3231 real-time clock chip; and the control module may be, but is not limited to, an STM32 series microcontroller, such as STM32F103C8T6. The key circuit connections are as follows: the analog output terminal AO of GP2Y0A21 is connected to the IN+ of AD620; the LED pin of GP2Y0A21 is connected to STM32 GPIO PA0, which can be driven by an NPN transistor; the IN- of AD620 is grounded, and its REF pin receives a reference voltage to amplify the signal output by GP2Y0A21; the AIN0 pin of ADS1115 is connected to the OUTPUT of AD620; the ADDR pin of ADS1115 is grounded; its SDA pin is connected to STM32 PB6 (I2C_SCL); its SCL pin is connected to STM32 PB7 (I2C_SDA); the SDA pin of DS3231 is connected to STM32 PB6 (sharing the I2C bus with ADS1115); its SCL pin is connected to STM32 PB7; and its INT pin is connected to STM32 EXTI0. The STM32's ADC input reads the conversion result from the ADS1115 via I2C. The I2C bus is connected to STM32 PB6 (SCL) and PB7 (SDA), where pull-up resistors can be configured. The display module is optional, but not limited to, an LCD screen. Its SDA pin is connected to STM32 PB6 (I2C bus multiplexed), and its SCL pin is connected to STM32 PB7. For other connections not detailed here, refer to existing technology or common knowledge for connection instructions.

[0034] In some optional solutions, a vibration sensing module can also be installed on the leaf spring 1. The signal output terminal of the vibration sensing module is electrically connected to the corresponding signal input terminal of the control module. When the vibration sensing module detects vibration of the leaf spring 1, the control module triggers the displacement sensing module to start detection based on the vibration signal collected by the vibration sensor. Here, a vibration signal threshold can be set. When the vibration signal detected by the vibration sensing module is higher than the threshold, the control module will only trigger the displacement sensing module to start detection, thus avoiding false triggering. A conventional existing vibration sensor can be used, such as a piezoresistive vibration sensor, such as the Honeywell Tronics THA 100. For specific circuit connections, refer to its user manual or the connection of GP2Y0A21 mentioned above.

[0035] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0036] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A device for testing the vibration damping performance of automotive leaf springs, characterized in that, include: The displacement sensing module, control module, and display module are installed on the frame beam; The displacement sensing module detects the vertical deformation of the leaf spring during the time period before and after the car passes over the ground obstacle; the signal output terminal of the displacement sensing module is electrically connected to the signal input terminal of the control module, and the control module receives the vertical deformation of the leaf spring collected by the displacement sensing module. The control module is electrically connected to the display module, and the control module controls the display module to display the deformation of the leaf spring in the vertical direction during the time period before and after the car passes over the road obstacle.

2. The automotive leaf spring damping performance testing device according to claim 1, characterized in that, Component one of the displacement sensing module is located at the lowest horizontal point of the vehicle leaf spring, and component two of the displacement sensing module is located on the vehicle frame beam opposite to component one and on the same vertical line.

3. The automotive leaf spring damping performance testing device according to claim 1, characterized in that, The lowest horizontal point of the automotive leaf spring is the center of the concave surface of the leaf spring.

4. The automotive leaf spring damping performance testing device according to claim 1, characterized in that, It also includes a timing module, which is connected to the control module. The control module controls the timing module to start timing when the displacement sensor detects that the leaf spring has deformed in the vertical direction.

5. The automotive leaf spring damping performance testing device according to claim 4, characterized in that, The timing module is integrated into the control module.

6. The automotive leaf spring damping performance testing device according to claim 1, characterized in that, The displacement sensing module is a high-precision laser displacement sensor.

7. The automotive leaf spring damping performance testing device according to claim 1, characterized in that, The leaf spring is also equipped with a vibration sensing module. The signal output terminal of the vibration sensing module is electrically connected to the corresponding signal input terminal of the control module. The control module triggers the displacement sensing module to detect vibration based on the vibration signal collected by the vibration sensor.

8. The automotive leaf spring damping performance testing device according to claim 1, characterized in that, It also includes a signal processing module, wherein the signal output terminal of the displacement sensing module is connected to the input terminal of the signal processing module, and the output terminal of the signal processing module is electrically connected to the corresponding signal input terminal of the control module.

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