A response time testing device and method for a damping adjustable shock absorber

Abstract

The embodiment of the application discloses a response time testing device of a damping-adjustable shock absorber, comprising: a test equipment control system for sending a first control signal to a direct current power supply system and sending a second control signal to a vertical driving device; the direct current power supply system is used for generating an output current according to the first control signal, powering the damping-adjustable shock absorber with the output current, and feeding back the value of the output current to the test equipment control system; the vertical driving device is used for driving the damping-adjustable shock absorber to move according to the second control signal; a sensor device is used for feeding back operating parameters to the test equipment control system; and the test equipment control system is used for determining the response time of the damping-adjustable shock absorber according to the value of the output current and the operating parameters. Through the integration of the direct current power supply system, the test equipment control system and the vertical driving device, the response time of the shock absorber is accurately obtained through the collection of damping force, displacement and current.

Description

Technical Field

[0001] This invention relates to the field of autonomous driving technology, and in particular to a device and method for testing the response time of an adjustable damper. Background Technology

[0002] To meet the increasing demands of autonomous driving, adjustable damping shock absorbers have been widely used in vehicles currently in production and under development. During the development of adjustable damping shock absorbers, bench testing is required to verify their performance. However, the testing methods used by different manufacturers are not standardized, especially regarding the testing of shock absorber response time, where there are significant differences.

[0003] Currently, when testing the response time of vibration dampers, the starting point for calculating the response time is usually the time when the current change command is issued. The time calculated by this method is not the response time of the damping adjustable vibration damper, but also includes the response time of the power supply system. Furthermore, the excitation of the damping adjustable vibration damper is a sine wave, which causes the damping force to change slowly, and also affects the test accuracy of the damping adjustable vibration damper response time. Summary of the Invention

[0004] This invention provides a response time testing device for adjustable damping shock absorbers to accurately obtain the response time of the adjustable damping shock absorbers.

[0005] In a first aspect, embodiments of the present invention provide a response time testing device for an adjustable damping shock absorber, comprising: a DC power supply system, a test equipment control system and a vertical excitation device respectively connected to the DC power supply system, wherein the vertical excitation device includes an adjustable damping shock absorber, a sensor device and a vertical drive device;

[0006] The test equipment control system is used to send a first control signal to the DC power supply system and a second control signal to the vertical drive device;

[0007] The DC power supply system is used to generate an output current according to the first control signal, use the output current to power the damping adjustable vibration damper, and feed back the value of the output current to the test equipment control system.

[0008] The vertical drive device is used to drive the damping adjustable shock absorber to move according to the second control signal;

[0009] The sensor device is used to collect the operating parameters of the adjustable damper during movement and power supply, and to feed the operating parameters back to the control system of the test equipment. The operating parameters include damping force and displacement value.

[0010] The test equipment control system is used to determine the response time of the damping adjustable vibration damper based on the value of the output current and the operating parameters.

[0011] Secondly, embodiments of the present invention provide a method for testing the response time of an adjustable damping shock absorber, comprising: the control system of the test equipment sending a first control signal to the DC power supply system and sending a second control signal to the vertical drive device;

[0012] The DC power supply system generates an output current according to the first control signal, uses the output current to power the damping adjustable vibration damper, and feeds back the value of the output current to the test equipment control system.

[0013] The vertical drive device drives the damping adjustable shock absorber to move according to the second control signal;

[0014] The sensor device collects the operating parameters of the adjustable damper during movement and power supply, and feeds the operating parameters back to the control system of the test equipment. The operating parameters include damping force and displacement value.

[0015] The control system of the test equipment determines the response time of the damping adjustable vibration damper based on the value of the output current and the operating parameters.

[0016] The technical solution of this invention integrates a DC power supply system, a test equipment control system, and a vertical excitation device. By collecting damping force, displacement, and current, the response time of the vibration damper is accurately obtained through calculation. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the response time testing device for the damped adjustable vibration damper provided in Embodiment 1 of the present invention;

[0019] Figure 2 This is a schematic diagram of the collected data provided in Embodiment 1 of the present invention;

[0020] Figure 3 This is a schematic diagram of the calculation of response time provided in Embodiment 1 of the present invention;

[0021] Figure 4This is a flowchart illustrating the response time testing method for the damped adjustable vibration damper provided in Embodiment 1 of the present invention. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention and not the entire structure.

[0023] It should also be noted that, for ease of description, the accompanying drawings show only the parts relevant to the invention and not all of them. Before discussing exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although the flowcharts describe the operations (or steps) as sequential processes, many of the operations can be performed in parallel, concurrently, or simultaneously. Furthermore, the order of the operations can be rearranged. The process can be terminated when its operation is completed, but it may also have additional steps not included in the drawings. The process can correspond to a method, software implementation, hardware implementation, etc.

[0024] Example 1

[0025] Figure 1 This is a schematic diagram of the response time testing device for an adjustable damper provided in Embodiment 1 of the present invention. This embodiment is applicable to testing the response time of an adjustable damper, such as... Figure 1 As shown, the response time testing device for the damped adjustable damper includes: a DC power supply system 11, a test equipment control system 12 and a vertical excitation device 13 respectively connected to the DC power supply system 11, wherein the vertical excitation device 13 includes a damped adjustable damper, a sensor device and a vertical drive device.

[0026] The test equipment control system sends a first control signal to the DC power supply system and a second control signal to the vertical drive device. The DC power supply system generates an output current based on the first control signal, uses the output current to power the adjustable damper, and feeds back the value of the output current to the test equipment control system. The vertical drive device drives the adjustable damper to move according to the second control signal. The sensor device collects the operating parameters of the adjustable damper during movement and power supply, and feeds back the operating parameters to the test equipment control system. The operating parameters include damping force and displacement values. The test equipment control system determines the response time of the adjustable damper based on the value of the output current and the operating parameters.

[0027] Optionally, the sensor equipment includes a force sensor and a displacement sensor connected to the adjustable damper via upper and lower hinge connections; the displacement sensor is used to collect the displacement value of the adjustable damper under the drive of the vertical drive device and feed the displacement value back to the test equipment control system; the force sensor is used to collect the damping force generated when the adjustable damper is powered and feed the damping force back to the test equipment control system.

[0028] In this embodiment, the vertical excitation device is a hydraulic or electric servo device. The vertical excitation device is controlled in a closed loop by the experimental equipment control system, which may include an experimental equipment drive system, a data acquisition system, and a data processing system.

[0029] Optionally, the test equipment drive system is used to send a first control signal to the DC power supply system and a second control signal to the vertical drive device; the data acquisition system is used to synchronously acquire the output current value of the DC power supply system, the displacement value fed back by the displacement sensor, and the damping force fed back by the force sensor; and the data processing system is used to determine the response time of the damping adjustable vibration damper based on the output current value, displacement value, and damping force.

[0030] It should be noted that the DC power supply system in this embodiment is for the damping adjustable vibration damper. The DC power supply system should have high response characteristics, with a response time of no more than 3ms from 10% to 90% of the rated current. It should have input and output interfaces, through which the output current can be controlled and acquired.

[0031] Optionally, the test equipment control system is connected to the vertical excitation device through an analog output interface and sends a second control signal to the vertical drive device through the analog output interface; the test equipment drive system is connected to the input interface of the DC power supply system through an analog output interface and sends a first control signal to the DC power supply system through the analog output interface.

[0032] Optionally, the test equipment control system is connected to the output interface of the DC power supply system through an analog input interface, and receives the output current value of the DC power supply system through the analog input interface; the test equipment control system is connected to the force sensor and displacement sensor through an analog input interface, and receives the displacement value and damping force through the analog input interface.

[0033] Specifically, the test equipment control system is connected to the input interface of the DC power supply system via an analog output interface. It calibrates the drive voltage and output current using a first control signal, and controls the output current by adjusting the drive voltage. The drive voltage is proportional to the output current; when the drive voltage is zero, the output current is zero. The system is also connected to the output interface of the DC power supply system via an analog input interface, and the data acquisition system collects the output current of the power supply, thereby controlling and acquiring the output current of the DC power supply system. Furthermore, the test equipment control system in this embodiment is also connected to the vertical excitation device via an analog output interface, outputting a vertical displacement excitation control signal (i.e., a second control signal). It is also connected to the force sensor and displacement sensor via an analog input interface, and the data acquisition system collects the damping force and displacement values, thereby controlling the vertical excitation device and acquiring force and displacement data.

[0034] Optionally, a vertical drive device is provided for reciprocating the adjustable damper a specified number of times with a triangular wave of a specified stroke and a specified speed according to a second control signal.

[0035] Optionally, the test equipment control system is used to update the first control signal sent to the DC power supply system after a specified number of cycles, so that the DC power supply system updates the output current according to the updated first control signal in the order of maximum current, minimum current, maximum current, 0, minimum current and 0.

[0036] Optionally, a data processing system is used to match and verify the periodicity of the output current value, displacement value, and damping force. When the verification is confirmed to be successful, the average damping force corresponding to each current change stage is determined based on the damping force. The response time of the adjustable damper is determined based on the average damping force and the output current value of each current change stage. The response time is compared with the standard time, and when they are found to be consistent, the adjustable damper is confirmed to have passed the test.

[0037] Specifically, when obtaining the response time of the adjustable damping vibration damper, the experimental equipment drive system first sends a second control signal to the vertical drive device. The vertical excitation device, with the initial position as the zero displacement point, performs three cycles of reciprocating loading on the test sample using a triangular wave with a stroke of ±50mm and a speed of ±13mm / s. Then, the power supply command of the DC power supply system is changed to the minimum power supply current I. min Simultaneously, load for 3 cycles; then change the power supply command of the DC power supply system to the maximum supply current I. MAX Simultaneously load for 3 cycles; stop the DC power supply system while continuously loading for 3 cycles; change the DC power supply command to the minimum supply current I. minSimultaneously, the load is applied for three cycles; the DC power supply is stopped, and the load is applied for three cycles, updating the output current in the order of maximum current, minimum current, maximum current, 0, minimum current, and 0. At each current change stage, the damping force of the force sensor and the displacement value of the displacement sensor are acquired through a data acquisition system. For calculation accuracy, the sampling frequency for the output current, damping force, and displacement values ​​can be no less than 1000Hz. However, this embodiment is merely illustrative and does not limit the specific value of the sampling frequency. Figure 2 The figure shown is a schematic diagram of the data collected in this embodiment, where the unit of output current is A and the unit of displacement is mm.

[0038] Among them, targeting Figure 2 As shown, the damper damping force curve where the load does not change abruptly represents the stable force segment. Using a program, the average force value in the stable force segment curve of the third cycle corresponding to the output current change during the test is automatically calculated. This allows the acquisition of the average damping force F corresponding to each current change stage. V1 F V2 F V3 F V4 F V5 F V6 .like Figure 3 The diagram illustrates the calculation of response time using the current change phase from 0 to maximum current as an example. The time when the current begins to change is equal to the time when the damper's damping force reaches 90% F. V1 The time difference is 0 to I MAX Response time t V1 Using the program, the above method is installed, and I is automatically calculated sequentially. MAX to I min Response time t V2 I min to I MAX Response time t V3 I MAX Response time t up to 0 V4 ,0 to I min Response time t V5 I min Response time t up to 0 V6 .

[0039] It is worth mentioning that since there is a corresponding standard time for each stage of current change in the adjustable damper, the response time obtained at each stage of current change is compared with the standard time. If the two are consistent, the adjustable damper can be determined to be qualified; otherwise, the test is determined to be unqualified.

[0040] The technical solution of this invention integrates a DC power supply system, a test equipment control system, and a vertical excitation device. By collecting damping force, displacement, and current, the response time of the vibration damper is accurately obtained through calculation.

[0041] Example 2

[0042] Figure 4 This invention provides a method for testing the response time of an adjustable damper, specifically an embodiment of the device for testing the response time of the adjustable damper described in the previous embodiment. The method includes:

[0043] In step S101, the test equipment control system sends a first control signal to the DC power supply system and a second control signal to the vertical drive device.

[0044] It should be noted that the DC power supply system in this embodiment is for the damping adjustable vibration damper. The DC power supply system should have high response characteristics, with a response time of no more than 3ms from 10% to 90% of the rated current. It should have input and output interfaces, through which the output current can be controlled and acquired.

[0045] Optionally, the test equipment control system is connected to the vertical excitation device through an analog output interface and sends a second control signal to the vertical drive device through the analog output interface; the test equipment drive system is connected to the input interface of the DC power supply system through an analog output interface and sends a first control signal to the DC power supply system through the analog output interface.

[0046] In step S102, the DC power supply system generates an output current based on the first control signal, uses the output current to power the damping adjustable vibration damper, and feeds back the value of the output current to the test equipment control system.

[0047] The test equipment control system is connected to the input interface of the DC power supply system through an analog output interface. It calibrates the drive voltage and output current through the first control signal. The output current is controlled by adjusting the drive voltage. The drive voltage is proportional to the output current. When the drive voltage is zero, the output current is zero. The system is connected to the output interface of the DC power supply system through an analog input interface. The data acquisition system collects the output current of the power supply, thereby realizing the control and acquisition of the output current of the DC power supply system.

[0048] In step S103, the vertical drive device drives the damping adjustable shock absorber to move according to the second control signal.

[0049] In this embodiment, the test equipment control system is also connected to the vertical excitation device through an analog output interface, and outputs a vertical displacement excitation control signal, namely the second control signal, to the vertical drive device, which is used to perform a specified number of cycles of reciprocating loading on the damped adjustable vibration damper with a specified stroke and a specified speed according to the second control signal.

[0050] In step S104, the sensor device collects the operating parameters of the adjustable damper during movement and power supply, and feeds the operating parameters back to the test equipment control system.

[0051] The operating parameters include damping force and displacement value. The test equipment control system receives the output current value of the DC power supply system through the analog input interface. The test equipment control system is connected to the force sensor and displacement sensor through the analog input interface, and receives displacement value and damping force through the analog input interface.

[0052] In step S105, the test equipment control system determines the response time of the damping adjustable vibration damper based on the output current value and operating parameters.

[0053] The test equipment control system updates the first control signal sent to the DC power supply system every specified number of cycles. This causes the DC power supply system to update the output current in the order of maximum current, minimum current, maximum current, 0, minimum current, and 0, based on the updated first control signal. Additionally, the data processing system verifies the periodicity of the output current value, displacement value, and damping force. When the verification is successful, the average damping force corresponding to each current change stage is determined. The response time of the adjustable damper is then determined based on the average damping force and the output current value for each current change stage. The response time is compared with a standard time; if they match, the adjustable damper test is considered successful.

[0054] Specifically, when obtaining the response time of the adjustable damping vibration damper, the experimental equipment drive system first sends a second control signal to the vertical drive device. The vertical excitation device, with the initial position as the zero displacement point, performs three cycles of reciprocating loading on the test sample using a triangular wave with a stroke of ±50mm and a speed of ±13mm / s. Then, the power supply command of the DC power supply system is changed to the minimum power supply current I. min Simultaneously, load for 3 cycles; then change the power supply command of the DC power supply system to the maximum supply current I. MAX Simultaneously load for 3 cycles; stop the DC power supply system while continuously loading for 3 cycles; change the DC power supply command to the minimum supply current I. minSimultaneously, the load is applied for three cycles; the DC power supply is stopped, and the load is applied for three cycles, updating the output current in the order of maximum current, minimum current, maximum current, 0, minimum current, and 0. At each current change stage, the damping force of the force sensor and the displacement value of the displacement sensor are acquired through a data acquisition system. To ensure calculation accuracy, the sampling frequency for the output current, damping force, and displacement values ​​can be no less than 1000Hz. However, this embodiment is merely illustrative and does not limit the specific value of the sampling frequency.

[0055] After obtaining the above-mentioned data, the response time of the damping adjustable shock absorber can be calculated by referring to the relevant content in Embodiment 1 above. This embodiment will not elaborate on this further.

[0056] The technical solution of this invention integrates a DC power supply system, a test equipment control system, and a vertical excitation device. By collecting damping force, displacement, and current, the response time of the vibration damper is accurately obtained through calculation.

[0057] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A response time testing device for an adjustable damping vibration damper, characterized in that, include: A DC power supply system, a test equipment control system and a vertical excitation device respectively connected to the DC power supply system, wherein the vertical excitation device includes a damped adjustable vibration damper, a sensor device and a vertical drive device; The test equipment control system is used to send a first control signal to the DC power supply system and a second control signal to the vertical drive device; The DC power supply system is used to generate an output current according to the first control signal, use the output current to power the damping adjustable vibration damper, and feed back the value of the output current to the test equipment control system; the response time of the DC power supply system from 10% to 90% of the rated current does not exceed 3ms. The vertical drive device is used to drive the damping adjustable shock absorber to move according to the second control signal; The sensor device is used to collect the operating parameters of the adjustable damper during movement and power supply, and to feed the operating parameters back to the control system of the test equipment. The operating parameters include damping force and displacement value. The control system of the test equipment is used to determine the response time of the damping adjustable vibration damper based on the value of the output current and the operating parameters. The vertical drive device is used to perform a specified number of cycles of reciprocating loading on the damping adjustable shock absorber with a specified stroke and a specified speed according to the second control signal. The test equipment control system is used to update the first control signal sent to the DC power supply system after a specified number of cycles, so that the DC power supply system updates the output current according to the updated first control signal in the order of maximum current, minimum current, maximum current, 0, minimum current and 0.

2. The apparatus according to claim 1, characterized in that, The sensor device includes a force sensor and a displacement sensor that are respectively connected to the damping adjustable shock absorber via upper and lower hinge connection devices. The displacement sensor is used to collect the displacement value of the damped adjustable vibration damper under the drive of the vertical drive device, and to feed the displacement value back to the control system of the test equipment. The force sensor is used to collect the damping force generated when the adjustable damper is powered, and to feed the damping force back to the control system of the test equipment.

3. The apparatus according to claim 2, characterized in that, The control system of the test equipment includes: a test equipment drive system, a data acquisition system, and a data processing system.

4. The apparatus according to claim 3, characterized in that, The test equipment drive system is used to send a first control signal to the DC power supply system and a second control signal to the vertical drive device; The data acquisition system is used to simultaneously acquire the output current value of the DC power supply system, the displacement value fed back by the displacement sensor, and the damping force fed back by the force sensor; The data processing system is used to determine the response time of the adjustable damper based on the value of the output current, the displacement value, and the damping force.

5. The apparatus according to claim 4, characterized in that, The test equipment control system is connected to the vertical excitation device through an analog output interface, and sends a second control signal to the vertical drive device through the analog output interface; The test equipment drive system is connected to the input interface of the DC power supply system through the analog output interface, and sends a first control signal to the DC power supply system through the analog output interface.

6. The apparatus according to claim 4, characterized in that, The control system of the test equipment is connected to the output interface of the DC power supply system through an analog input interface, and receives the value of the output current of the DC power supply system through the analog input interface. The control system of the test equipment is connected to the force sensor and the displacement sensor through an analog input interface, and receives the displacement value and the damping force through the analog input interface.

7. The apparatus according to claim 3, characterized in that, The data processing system is used to perform matching verification of the output current value, the displacement value and the periodicity of the damping force. When the verification is found to be successful, the average damping force corresponding to each current change stage is determined based on the damping force. The response time of the adjustable damper is determined based on the average damping force and the value of the output current during each current change stage. The response time is compared with the standard time. If they are consistent, the damping adjustable vibration damper is considered to have passed the test.

8. A method for testing the response time of an adjustable damping shock absorber, applied to the device described in any one of claims 1 to 7, characterized in that, include: The test equipment control system sends a first control signal to the DC power supply system and a second control signal to the vertical drive device; The DC power supply system generates an output current according to the first control signal, uses the output current to power the damping adjustable vibration damper, and feeds back the value of the output current to the test equipment control system. The vertical drive device drives the damping adjustable shock absorber to move according to the second control signal; The sensor device collects the operating parameters of the adjustable damper during movement and power supply, and feeds the operating parameters back to the control system of the test equipment. The operating parameters include damping force and displacement value. The control system of the test equipment determines the response time of the damping adjustable vibration damper based on the value of the output current and the operating parameters.

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