Automobile kinematics fragment extraction and working condition diagram synthesis method

Abstract

The invention discloses an automobile kinematics segment extraction and working condition diagram synthesis method. The automobile kinematics segment extraction method comprises the following steps: firstly, screening representative test road sections, collecting driving data, cleaning bad data, filling missing data, finding starting and stopping positions of kinematics segments, and extracting all kinematics segments according to the starting and stopping positions; the working condition graph synthesis method comprises the following steps: firstly, calculating automobile driving characteristic parameters of each kinematics segment; drawing a Silhouette contour map according to the silhouette contour map; and determining the clustering number of the principal component characteristic parameters, counting the principal component characteristic parameters in each category, selecting the most representative kinematics segment of each scene, determining the splicing sequence, randomly splicing the typical scenes into a driving working condition graph, and taking the working condition graph with the minimum CPV as a final automobile driving working condition graph. According to the method, the to-be-supplemented data is reasonably filled, and an automobile driving working condition graph conforming to the current actual conditions such as the road structure, the road traffic condition and the traffic regulations in China can be constructed.

Description

technical field [0001] The invention belongs to the technical field of vehicle design, and in particular relates to a method for extracting automobile kinematics fragments and synthesizing working condition diagrams. Background technique [0002] Vehicle driving condition, also known as vehicle test cycle, is a curve describing vehicle speed-time (generally, the total time is within 1800 seconds), which reflects the kinematic characteristics of vehicle road driving, and is the fuel consumption and emission detection and limit standard of motor vehicles. It is also the main benchmark for the calibration and optimization of various performance indicators of automobiles. It is particularly important to construct a vehicle driving condition diagram that conforms to the actual conditions of our country's current road structure, road traffic conditions, and traffic regulations without relying on the vehicle driving condition diagrams of other countries. [0003] The existing vehi...

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Problems solved by technology

[0005] Aiming at the problem that the existing kinematics segment extraction technology lacks a unified data preprocessing process, the present invention proposes a complete data preprocessing scheme; aiming at the problem that the current kinematics segment extraction technology does not distinguish driving scenes, a A method for extracting kinematic segments of typical scenes of car driving; at the same time, in view of the lack of evaluation of working map in the current construction technology of car driving map, a method for evaluating the motion characteristics of car driving map based on CPV value is proposed

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