CN-122016352-A - Online testing method and system for performance of electric vehicle shock absorber

CN122016352ACN 122016352 ACN122016352 ACN 122016352ACN-122016352-A

Abstract

The embodiment of the application provides an on-line test method and system for the performance of an electric vehicle shock absorber, and relates to the technical field of performance test of electric vehicle shock absorbers, wherein the method comprises the steps of obtaining running condition information of a vehicle, wherein the running condition information comprises a load state of the vehicle and an elastic state of a tire; the method comprises the steps of obtaining actual response characteristics of the shock absorber to preset excitation in operation, wherein the actual response characteristics comprise transient damping force peak values or frequency band energy distribution of the shock absorber, adjusting an evaluation standard of the actual response characteristics according to running condition information, comparing the actual response characteristics with the evaluation standard, determining differences to obtain difference amounts and tracking variation trends of the differences, obtaining performance states of the shock absorber according to the difference amounts and the variation trends of the differences, and generating and sending early warning information according to the difference amounts, the variation trends of the differences and the performance states of the shock absorber. The application can improve the accuracy, reliability and adaptability of the on-line test of the performance of the shock absorber.

Inventors

QU QINRONG
QU ZEYU
QU JIANI
LI BAILU

Assignees

浙江宇嘉新能源科技股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260206

Claims (10)

1. An on-line test method for the performance of an electric vehicle shock absorber is characterized by comprising the following steps: acquiring running condition information of a vehicle, wherein the running condition information comprises a loading state of the vehicle and an elastic state of a tire; Acquiring the actual response characteristic of the shock absorber to preset excitation in operation, wherein the actual response characteristic comprises the transient damping force peak value or the frequency band energy distribution of the shock absorber; according to the running condition information, adjusting an evaluation benchmark of the actual response characteristic; Comparing the actual response characteristic with the evaluation reference, determining the difference between the actual response characteristic and the evaluation reference, obtaining a difference amount and tracking the variation trend of the difference; obtaining the performance state of the shock absorber according to the difference quantity and the variation trend of the difference; And generating and sending early warning information according to the difference amount, the variation trend of the difference and the performance state of the shock absorber.
2. The method of claim 1, wherein the obtaining an actual response characteristic of the shock absorber to a preset stimulus during operation comprises: When the preset excitation is that the vehicle passes through the deceleration strip, acquiring the actual response characteristic of the shock absorber, wherein the actual response characteristic is a transient damping force peak value of the shock absorber; and when the preset excitation is crossing a depression of a road surface, suddenly accelerating or braking, acquiring the actual response characteristic of the shock absorber, wherein the actual response characteristic is frequency band energy distribution.
3. The method of claim 1, wherein adjusting the evaluation criteria of the actual response characteristic based on the operating condition information comprises: Acquiring standard shock absorber data under different loading and tire pressure conditions; Establishing a relation curve between the damping force of the shock absorber and the speed of the piston according to the standard shock absorber data, and correcting rules of the relation curve along with the change of the load state of the vehicle and the elastic state of the tire; and adjusting an evaluation benchmark of the actual response characteristic according to the running condition information, the relation curve and the correction rule.
4. A method according to claim 3, wherein said adjusting the evaluation criterion of the actual response characteristic according to the operation condition information, the relation curve, and the correction rule comprises: when the running condition information represents a load state of the vehicle to be a heavy load state, adjusting an evaluation reference of a transient damping force peak value of the shock absorber according to the load state of the vehicle, the relation curve and the correction rule; And when the running condition information represents that the elastic state of the tire is a pressure drop state, adjusting an evaluation reference of the frequency band energy distribution of the shock absorber according to the elastic state of the tire, the relation curve and the correction rule.
5. The method according to claim 1, wherein the obtaining the performance state of the shock absorber according to the difference amount and the trend of the difference, includes: And when the difference quantity exceeds a preset tolerance range and the variation trend of the difference is a gradually increasing trend, obtaining the performance state of the shock absorber as attenuation according to the difference quantity and the variation trend of the difference.
6. The method according to claim 1, wherein obtaining the elastic state of the tyre comprises: continuously monitoring the tread wear of the tire; When the tread wear degree reaches a preset threshold value, correcting structural rigidity parameters and ground contact area parameters in a preset tire physical model according to the tread wear degree to obtain corrected structural rigidity parameters and corrected ground contact area parameters; And obtaining the elastic state of the tire according to the corrected structural rigidity parameter and the ground contact area parameter.
7. The method of claim 1, wherein generating and sending pre-warning information based on the amount of difference, the trend of the difference, and the performance state of the shock absorber, comprises: Obtaining the running situation of the vehicle and the potential influence degree of external factors on the performance evaluation result of the shock absorber according to the difference amount, the variation trend of the difference and the performance state of the shock absorber; And generating and sending early warning information according to the potential influence degree.
8. The method according to claim 7, wherein the obtaining the vehicle running situation and the potential influence degree of the external factors on the performance evaluation result of the shock absorber according to the difference amount, the variation trend of the difference and the performance state of the shock absorber includes: presetting a difference quantity threshold interval, a difference change trend threshold and a shock absorber performance state grading standard; matching the difference with the difference threshold interval to obtain a difference grade; comparing the variation trend of the difference with the variation trend threshold to obtain a variation trend grade, wherein the variation trend comprises a variation increment rate, a variation decrement rate and a variation amplitude; and combining the difference quantity grade, the change trend grade and the performance state of the shock absorber, and calculating to obtain the running situation of the vehicle and the potential influence degree of external factors on the performance evaluation result of the shock absorber through a preset evaluation model.
9. The method of claim 7, wherein generating and sending pre-warning information based on the potential impact level comprises: When the potential influence degree is a slight influence level, generating and sending prompt early warning information, wherein the prompt early warning information only informs the external factors and the potential influence range; When the potential influence degree is a moderate influence level, generating and sending warning type early warning information, wherein the warning type early warning information comprises external factors, influence degree and preliminary adjustment suggestions; And when the potential influence degree is a serious influence level, generating and sending emergency early warning information, wherein the emergency early warning information comprises external factors, influence degree, emergency adjustment scheme and fault risk prompt.
10. An electric vehicle shock absorber performance on-line testing system, comprising: The first acquisition module is used for acquiring running condition information of the vehicle, wherein the running condition information comprises a loading state of the vehicle and an elastic state of a tire; The second acquisition module is used for acquiring the actual response characteristic of the shock absorber to the preset excitation in operation, wherein the actual response characteristic comprises the transient damping force peak value or the frequency band energy distribution of the shock absorber; the adjusting module is used for adjusting the evaluation standard of the actual response characteristic according to the running condition information; The difference determining module is used for comparing the actual response characteristic with the evaluation reference, determining the difference between the actual response characteristic and the evaluation reference, obtaining a difference amount and tracking the variation trend of the difference; the state determining module is used for obtaining the performance state of the shock absorber according to the difference quantity and the variation trend of the difference; and the generation and emission module is used for generating and emitting early warning information according to the difference quantity, the variation trend of the difference and the performance state of the shock absorber.

Description

Online testing method and system for performance of electric vehicle shock absorber Technical Field The application relates to the technical field of performance test of electric vehicle shock absorbers, in particular to an online performance test method and system for electric vehicle shock absorbers. Background In order to master the working condition of the electric vehicle shock absorber in real time and discover performance degradation in time, the industry develops an online test technology. According to the technology, sensors are arranged near a vehicle body and wheels, relative motion data of the vehicle body and the wheels in running are collected and compared with standard response references prestored by a control unit, and early warning is sent out if deviation exceeds a threshold value. However, the actual use environment is far more complex than the ideal working condition, and the real-time changes of the load, load distribution, tire pressure and the like of the vehicle can influence the characteristics of the suspension system, so that the test misjudgment is caused. The change of the load can change the rigidity of the suspension, for example, the vibration signal difference of the shock absorber is obvious between the full load and the no-load, and if the no-load standard is still used, the suspension is easy to report by mistake. The uneven load distribution can also cause misjudgment, for example, the load of a rear axle is increased due to the heavy load of a trunk, the working state of a rear wheel shock absorber is obviously different from that of a front wheel, and a system neglecting the load distribution can misreport the fault of the rear axle shock absorber. In addition, the tire air pressure determines the rigidity of the tire, the buffer effect of the tire is enhanced when the air pressure is insufficient, the vibration transmitted to the shock absorber is weakened, and the system can be misjudged as abnormal damping of the shock absorber. The existing method is difficult to distinguish whether the data change is caused by the self-decline of the shock absorber or the external factor, false alarm and missing alarm are easy to occur, and the test accuracy and reliability are not enough. Disclosure of Invention The present application aims to solve at least one of the technical problems existing in the prior art. Therefore, the application provides an online test method and system for the performance of an electric vehicle shock absorber, and aims to improve the accuracy, reliability and adaptability of the online test of the performance of the shock absorber. In a first aspect, an embodiment of the present application provides an online test method for performance of an electric vehicle shock absorber, including: acquiring running condition information of a vehicle, wherein the running condition information comprises a loading state of the vehicle and an elastic state of a tire; Acquiring the actual response characteristic of the shock absorber to preset excitation in operation, wherein the actual response characteristic comprises the transient damping force peak value or the frequency band energy distribution of the shock absorber; according to the running condition information, adjusting an evaluation benchmark of the actual response characteristic; Comparing the actual response characteristic with the evaluation reference, determining the difference between the actual response characteristic and the evaluation reference, obtaining a difference amount and tracking the variation trend of the difference; obtaining the performance state of the shock absorber according to the difference quantity and the variation trend of the difference; And generating and sending early warning information according to the difference amount, the variation trend of the difference and the performance state of the shock absorber. According to some embodiments of the application, the obtaining the actual response characteristic of the shock absorber to the preset excitation in operation includes: When the preset excitation is that the vehicle passes through the deceleration strip, acquiring the actual response characteristic of the shock absorber, wherein the actual response characteristic is a transient damping force peak value of the shock absorber; and when the preset excitation is crossing a depression of a road surface, suddenly accelerating or braking, acquiring the actual response characteristic of the shock absorber, wherein the actual response characteristic is frequency band energy distribution. According to some embodiments of the application, the adjusting the evaluation criterion of the actual response characteristic according to the operation condition information includes: Acquiring standard shock absorber data under different loading and tire pressure conditions; Establishing a relation curve between the damping force of the shock absorber and the speed of the piston according to the