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Energies 2016, 9(4), 290; doi:10.3390/en9040290

Robust Longitudinal Speed Control of Hybrid Electric Vehicles with a Two-Degree-of-Freedom Fuzzy Logic Controller

Department of Mechanical and Electro-Mechanical Engineering, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan
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Academic Editor: Dirk Söffker
Received: 6 January 2016 / Revised: 30 March 2016 / Accepted: 7 April 2016 / Published: 16 April 2016
(This article belongs to the Special Issue Power Management for Hybrids and Vehicle Drivetrains)
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Abstract

This paper proposes a new robust two-degree-of-freedom (DoF) design method for controlling the nonlinear longitudinal speed problem of hybrid electric vehicles (HEVs). First, the uncertain parameters of the HEV model are described by fuzzy α-cut representation, in which the interval uncertainty and the possibility can be simultaneously indicated by the fuzzy membership function. For the fuzzy parametric uncertain system, the maximum uncertainty interval can be translated into the weighting matrix Q of the linear quadratic tracking problem to guarantee that the designed feedback controller is robust. Second, the fuzzy forward compensator is incorporated with a robust feedback controller to enhance the system tracking response. The simulation results demonstrate that the proposed controller has higher tracking performance compared to the single-DoF self-tuning fuzzy logic controller or conventional optimal H controller. View Full-Text
Keywords: two-degree-of-freedom (DoF) design; fuzzy parametric uncertain system; fuzzy α-cut representation two-degree-of-freedom (DoF) design; fuzzy parametric uncertain system; fuzzy α-cut representation
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Perng, J.-W.; Lai, Y.-H. Robust Longitudinal Speed Control of Hybrid Electric Vehicles with a Two-Degree-of-Freedom Fuzzy Logic Controller. Energies 2016, 9, 290.

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