High-precision fast self-compensating method of automobile chassis dynamometer resistance simulation

Abstract

The present invention provides a high-precision fast self-compensating method of automobile chassis dynamometer resistance simulation. According to the method, the test data is collected according to the index point and is standardized; then the characteristic space analysis is executed for calculating out the eigenvalue and the eigenvector; then the eigenvector corresponding with a maximum eigenvalue is calculated out; the eigenvector corresponding with the maximum eigenvalue is extracted; the contribution degree of the nonlinear input space, which is obtained by multiplying the eigenvector with a standard data sample, is marked as Gi, and the average value is represented as Gi, and the value of the contribution degree is obtained on this basis. Then the precision error e is calculated through the radio between a difference and the measured resistance, wherein the difference is between the measured resistance and the i-th simulated resistance. When the absolute value of e is larger than an anticipated control precision, taking e as a compensation precision modifying factor betai, and stopping the iteration otherwise. Finally the simulated resistance value on the chassis dynamometer is determined according to a formula and output for realizing the high-precision self-compensation of the chassis resistance. The method of the invention can greatly reduce the artificial subjective effect of the automobile chassis dynamometer in installation debugging and resistance simulation test, reduce the experiment number and increase the resistance simulation precision.

Description

【Technical field】: The invention relates to the technical field of automatic control, in particular to a bench high-precision resistance control technology for multi-working-condition emission tests of automobile chassis dynamometers. 【Background technique】: Automobile chassis dynamometer is an important device for overall testing of automobile dynamic characteristic parameters. It usually includes drum and mechanical system, data acquisition and conversion system, industrial computer real-time control system, database support system and human-computer interaction interface. The bench test process of the multi-condition emission test refers to the process of testing the vehicle's dynamic characteristics, fuel consumption and multi-condition emission indicators by simulating the road driving conditions on the indoor bench. In addition, the vehicle chassis dynamometer can also be used to easily adjust the load of the vehicle and diagnose the faults of the vehicle under load co...

AI Technical Summary

Problems solved by technology

The purpose of the present invention is to solve the problems of low resistance simulation accuracy and low test efficiency caused by the nonlinear fluctuation of test data in the resistance simulation test of the automobile chassis dynamometer, and provide a high-precision resistance simulation of the automobile chassis dynamometer. fast self-compensation method