An intelligent second-order sliding-mode control for an electric power steering system using a wavelet fuzzy neural network

Faa Jeng Lin, Ying Chih Hung, Kai Chun Ruan

Research output: Contribution to journalArticlepeer-review

104 Scopus citations

Abstract

An intelligent second-order sliding-mode control (I2OSMC) using a wavelet fuzzy neural network with an asymmetric membership function (WFNN-AMF) estimator is proposed in this study to control a six-phase permanent magnet synchronous motor (PMSM) for an electric power steering (EPS) system. First, the dynamics of the steer-by-wire (SBW) EPS system and six-phase PMSM drive system with a lumped uncertainty are described in detail. Then, to alleviate the chattering phenomena in a traditional sliding-mode control (SMC), a second-order sliding-mode control (2OSMC) is designed. Moreover, the I2OSMC is developed to improve the required control performance of the EPS system. In the I2OSMC, the WFNN-AMF estimator with accurate approximation capability is employed to estimate the lumped uncertainty. Furthermore, the adaptive learning algorithms for the online training of the WFNN-AMF are derived using the Lyapunov theorem to guarantee the asymptotical stability of the closed-loop system. In addition, a 32-bit floating-point digital signal processor (DSP), i.e., TMS320F28335, is adopted for the implementation of the proposed control approach. Finally, some experimental results are illustrated to demonstrate the validity of the proposed I2OSMC using the WFNN-AMF estimator for the EPS system.

Original languageEnglish
Article number6712901
Pages (from-to)1598-1611
Number of pages14
JournalIEEE Transactions on Fuzzy Systems
Volume22
Issue number6
DOIs
StatePublished - 1 Dec 2014

Keywords

  • Asymmetric membership function
  • electric power steering (EPS)
  • second-order sliding-mode control
  • six-phase permanent magnet synchronous motor (PMSM)
  • wavelet fuzzy neural network (WFNN)

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