A method for constructing an automobile transient driving condition length

Abstract

The invention provides a method for constructing an automobile transient driving condition length, which comprises the following steps: S1, dividing total sample data into a plurality of short strokes, and respectively calculating the total sample data and V-A matrix of each short stroke; S2, obtaining total sample data obtained in the step S1 and V-A matrix of each short stroke according to thetotal sample data obtained in the step S1; the V-A matrix is used for calculating the similarity between each short stroke and the total sample data; S3, selecting a short stroke with the highest similarity with the total sample data, sequentially splicing the selected short strokes, and solving the V-A matrix of the spliced working condition segments every time one short stroke is spliced; S4, obtaining V-of the working condition segment according to the working condition segment obtained in the step S3; the V-A matrix is used for calculating the Euclidean distance D between the working condition segment and the total sample data; S5, repeating S3 and S4 until the curve of the Euclidean distance D tends to be gentle, and determining that the working condition segment corresponding to theEuclidean distance D is the working condition length of transient driving of the automobile. According to the method, the vehicle driving working condition with the proper length is constructed, the situation that the constructed working condition cannot reflect the actual driving characteristics due to the small working condition length is avoided, and the situation that the workload of later working condition application is increased meaninglessly due to the too long working condition length is avoided.

Description

technical field [0001] The invention belongs to the technical field of transient driving conditions of automobiles, and relates to a method for constructing the length of transient driving conditions of automobiles. Background technique [0002] Vehicle driving conditions play an important role in the economic analysis of the vehicle, the matching of power system parameters, emission detection and control strategy optimization, and it is a common basic technology in the automotive industry. Domestic research on working conditions started relatively late, and many national and industry standards adopt or refer to ECE working conditions. A reasonable case length is important for building cases. If the working condition length is too short, it cannot reflect the actual operating conditions of the city bus, but if the working condition length is too long, it will needlessly increase the workload of working condition construction and later application. Regarding the length of t...

AI Technical Summary

Problems solved by technology

If the working condition length is too short, it cannot reflect the actual operating conditions of the city bus, but if the working condition length is too long, it will needlessly increase the workload of working condition construction and later application

Regarding the length of the constructed working conditions, the research shows that the driving conditions of about 10 minutes are enough to reflect all the driving characteristics of the vehicle and are convenient for practical operation. Considering the randomness and insufficient amount of the samples, the duration of the driving conditions is generally extended by 10-30 minutes, this is a time range, and there is no standard and method for determining the length of the vehicle operating condition

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