The Open Mechanical Engineering Journal

2016, 10 : 136-147
Published online 2016 July 21. DOI: 10.2174/1874155X01610010136
Publisher ID: TOMEJ-10-136

RESEARCH ARTICLE
 Mode-decomposing Analysis of the Extreme Load in Hybrid Electric Vehicles Using Extreme Value Theory

Jian Zhou , Jixin Wang and Hongbin Chen, *
School of Mechanical Science and Engineering, Jilin University, 130022, Changchun, Jilin, China

Address correspondence to this author at the Nanling Campus of Jilin University, No. 5988 of Renmin Avenue, Changchun, Jilin Province, China; Postcard: 130022; Tel: +86 13596157924; E-mail: jxwang@jlu.edu.cn

ABSTRACT

In a hybrid electric vehicle (HEV), the hybrid system, which is equipped with an engine and a motor, is a key component. However, given the multimode characteristics of HEV, the original extreme load of the engine or motor is not independent and the random variables cannot be directly fitted by the extreme value theory (EVT). Thus, this paper proposes a mode-decomposing application method (MDAM) using EVT. Based on the method, three typical distributions, including the Fréchet distribution, the Gumbel distribution, and the Weibull distribution, were combined as a unified expression, and it was adopted to fit the extreme loads within different modes of HEV. By comparing the fitting results, especially the shapes of the curves, the distributions of the load under different modes vary from each other, so the feasibility and necessity of MDAM in HEV are proved, and a new thought for fitting the extreme load in HEV is provided, which will contribute to improve the fitting accuracy.

Keywords:

EVT, Extreme load, HEV, Load distribution, MDAM, Multimode operation.