Title: Feature extraction of electromagnetic interference in hybrid electric vehicle ignition system

Authors: Xu Li; Zhengsheng Wang; Jugang He

Addresses: China Chang'an Automotive Engineering Institute, Chongqing 401120, China; State Key Laboratory of Vehicle NVH and Safety Technology, Chongqing 401120, China ' China Chang'an Automotive Engineering Institute, Chongqing 401120, China ' China Chang'an Automotive Engineering Institute, Chongqing 401120, China; State Key Laboratory of Vehicle NVH and Safety Technology, Chongqing 401120, China

Abstract: Wavelet packet transform (WPT) is employed to analyse the common mode (CM) current signal from the ignition system of a hybrid electric vehicle (HEV). The CM current signal is decomposed into 16 sub-bands using WPT in the frequency domain. The integrated energy parameter of wavelet packet coefficient (WPC) is extracted to describe electromagnetic interference (EMI) characteristics. The location of the main frequency zone for energy distribution was confirmed as the frequency band (62.5-70.3 MHz). When WPT is used, the obtained CM current spectrum has the same energy features compared with the spectrum derived using fast Fourier transform (FFT). The results accurately indicate that when WPT is used, the extracted integration energy parameter of WPC can also represent EMI characteristics.

Keywords: HEV; hybrid electric vehicles; electromagnetic interference; feature extraction; wavelet packet transform; WPT; hybrid vehicles; vehicle ignition systems.

DOI: 10.1504/IJEHV.2013.056300

International Journal of Electric and Hybrid Vehicles, 2013 Vol.5 No.2, pp.123 - 129

Received: 21 Jan 2013
Accepted: 06 Mar 2013
Published online: 09 Sep 2013 *

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