CN-122016337-A - Pedestrian protection test leg type posture monitoring method and device

CN122016337ACN 122016337 ACN122016337 ACN 122016337ACN-122016337-A

Abstract

The application relates to the technical field of vehicle collision, in particular to a method and a device for monitoring a leg-shaped gesture of a pedestrian protection test, wherein the method comprises the steps of collecting point cloud information from the emission time of a leg-shaped impactor to the collision time of the leg-shaped impactor and the test vehicle; and calculating the height between the bottom end of the leg-shaped impactor and the ground reference surface and the attitude angle of the leg-shaped impactor based on the contact point cloud information. Therefore, the problems that in the related technology, accurate judgment of collision time in the collision process of the leg type impactor and the vehicle is not involved, accurate analysis and evaluation of collision details are difficult to realize and the like are solved.

Inventors

LI CHAO
LIN XINTONG
JI JIALIANG
LIU XINRAN
LIU HAOTIAN
LI YANG

Assignees

中国第一汽车股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260206

Claims (10)

1. The method for monitoring the leg type posture of the pedestrian protection test is characterized by comprising the following steps of: Acquiring point cloud information from the emission time of a leg-type impactor to the collision time of the leg-type impactor and a test vehicle; Determining a first contact time of the leg-type impactor and the test vehicle based on the point cloud information, and extracting contact point cloud information corresponding to the first contact time; and calculating the height between the bottom end of the leg-type impactor and the ground reference plane and the attitude angle of the leg-type impactor based on the contact point cloud information.
2. The method of claim 1, wherein the acquiring point cloud information from a time of emission of a leg-type impactor to a time of collision of the leg-type impactor with a test vehicle comprises: Detecting whether the point cloud information meets a preset condition; and if the point cloud information does not meet the preset condition, processing the point cloud information until the processed point cloud information meeting the preset condition is obtained.
3. The method of claim 1, wherein determining a first contact time of the leg impactor with the test vehicle based on the point cloud information comprises: determining multi-frame point cloud information corresponding to the point cloud information based on the point cloud information; slicing the multi-frame point cloud information along the longitudinal surface of the test vehicle passing through the center direction of the leg-type impactor to obtain a first external rectangle of the leg-type impactor and a second external rectangle of the test vehicle; Determining a first supporting point in the first circumscribed rectangle and a second supporting point in the second circumscribed rectangle; Constructing a minkowski difference set based on the first supporting point and the second supporting point; Constructing a simplex based on the support points in the Minkowski difference set; The first contact time is determined based on the simplex.
4. A method according to claim 3, wherein said determining said first contact time based on said simplex comprises: Acquiring a target supporting point of the simplex; determining a target direction from the target supporting point to a coordinate origin based on the target supporting point; Determining an iteration direction of the simplex based on the target direction; determining a contact result of the leg-type impactor and the test vehicle based on the iteration direction; and determining the first contact time based on the contact result.
5. The method of claim 1, wherein the calculating the height between the leg impactor bottom end and the ground reference surface and the attitude angle of the leg impactor based on the contact point cloud information comprises: determining the ground reference surface based on the point cloud information; determining a first height of the ground reference surface in a target coordinate system and a second height of the bottom end of the leg-type impactor in the target coordinate system based on the ground reference surface; And calculating the height between the bottom end of the leg-type impactor and the ground reference surface based on the first height and the second height.
6. The method of claim 5, wherein calculating the height between the leg impactor bottom end and the ground reference surface and the attitude angle of the leg impactor based on the contact point cloud information comprises: determining a first direction vector of the leg-type impactor based on the contact point cloud information; acquiring a second direction vector of the target coordinate system; The attitude angle is calculated based on the first direction vector and the second direction vector.
7. A pedestrian protection test leg posture monitoring device, comprising: The acquisition module is used for acquiring point cloud information from the emission time of the leg-type impactor to the collision time of the leg-type impactor and the test vehicle; The determining module is used for determining a first contact time of the leg-shaped impactor and the test vehicle based on the point cloud information and extracting contact point cloud information corresponding to the first contact time; And the calculating module is used for calculating the height between the bottom end of the leg-shaped impactor and the ground reference plane and the attitude angle of the leg-shaped impactor based on the contact point cloud information.
8. A vehicle comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor executing the program to implement the pedestrian protection test leg style posture monitoring method of any one of claims 1-6.
9. A computer-readable storage medium, on which a computer program is stored, characterized in that the program is executed by a processor for implementing a method of monitoring a pedestrian protection test leg posture as claimed in any one of claims 1-6.
10. A computer program product comprising a computer program which, when executed, is adapted to carry out a method of monitoring a pedestrian protection test leg posture as claimed in any one of claims 1 to 6.

Description

Pedestrian protection test leg type posture monitoring method and device Technical Field The application relates to the technical field of vehicle collision, in particular to a method and a device for monitoring a leg posture of a pedestrian protection test. Background In the related technology, based on the impact structural characteristics of the upper half body of the international passing front collision dummy, structural members of all parts of the pedestrian protection dummy are respectively designed and manufactured by a computer digital model design or a physical object manufacturing method and then integrated into an integral impact structural body, a pressure model can be built on a bumper section model, a leg type impactor model is arranged after the maximum deformation is obtained through collision simulation, and position relation data are extracted to judge whether the bumper performance is qualified. However, in the related art, the accurate determination of the collision time in the collision process of the leg-type impactor and the vehicle is not involved, so that the accurate analysis and evaluation of the collision details are difficult to realize, and improvement is needed. Disclosure of Invention The application provides a method and a device for monitoring a leg type gesture of a pedestrian protection test, which are used for solving the problems that in the related technology, the accurate judgment of collision time in the collision process of a leg type impactor and a vehicle is not involved, the accurate analysis and evaluation of collision details are difficult to realize, and the like. The embodiment of the first aspect of the application provides a monitoring method for a pedestrian protection test leg type gesture, which comprises the following steps of collecting point cloud information from the emission time of a leg type impactor to the collision time of the leg type impactor and a test vehicle, determining the first contact time of the leg type impactor and the test vehicle based on the point cloud information, extracting contact point cloud information corresponding to the first contact time, and calculating the height between the bottom end of the leg type impactor and a ground reference plane and the gesture angle of the leg type impactor based on the contact point cloud information. Optionally, in one embodiment of the present application, the collecting the point cloud information from the emission time of the leg-type impactor to the collision time of the leg-type impactor with the test vehicle includes detecting whether the point cloud information meets a preset condition, and if the point cloud information does not meet the preset condition, processing the point cloud information until the processed point cloud information meeting the preset condition is obtained. Optionally, in one embodiment of the application, the determining the first contact time of the leg-shaped impactor and the test vehicle based on the point cloud information comprises determining multi-frame point cloud information corresponding to the point cloud information based on the point cloud information, slicing the multi-frame point cloud information along the longitudinal plane of the test vehicle and passing through the center direction of the leg-shaped impactor to obtain a first circumscribed rectangle of the leg-shaped impactor and a second circumscribed rectangle of the test vehicle, determining a first supporting point in the first circumscribed rectangle and a second supporting point in the second circumscribed rectangle, building a Minkowski difference set based on the first supporting point and the second supporting point, building a simplex based on the supporting points in the Minkowski difference set, and determining the first contact time based on the simplex. Optionally, in one embodiment of the present application, the determining the first contact time based on the simplex includes obtaining a target supporting point of the simplex, determining a target direction from the target supporting point to a coordinate origin based on the target supporting point, determining an iteration direction of the simplex based on the target direction, determining a contact result of the leg-type impactor and the test vehicle based on the iteration direction, and determining the first contact time based on the contact result. Optionally, in one embodiment of the application, the calculating the height between the bottom end of the leg-type impactor and the ground reference surface and the attitude angle of the leg-type impactor based on the contact point cloud information comprises determining the ground reference surface based on the point cloud information, determining a first height of the ground reference surface under a target coordinate system and a second height of the bottom end of the leg-type impactor under the target coordinate system based on the ground reference surface, and calculatin